diff options
Diffstat (limited to 'drivers/scsi/ibmvscsi')
| -rw-r--r-- | drivers/scsi/ibmvscsi/Makefile | 2 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvfc.c | 5041 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvfc.h | 776 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.c | 2394 | ||||
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.h | 112 |
5 files changed, 8325 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/Makefile b/drivers/scsi/ibmvscsi/Makefile new file mode 100644 index 000000000..3840c64f2 --- /dev/null +++ b/drivers/scsi/ibmvscsi/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsi.o +obj-$(CONFIG_SCSI_IBMVFC) += ibmvfc.o diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c new file mode 100644 index 000000000..b811436a4 --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -0,0 +1,5041 @@ +/* + * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter + * + * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation + * + * Copyright (C) IBM Corporation, 2008 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/kthread.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/pm.h> +#include <linux/stringify.h> +#include <linux/bsg-lib.h> +#include <asm/firmware.h> +#include <asm/irq.h> +#include <asm/vio.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_transport_fc.h> +#include <scsi/scsi_bsg_fc.h> +#include "ibmvfc.h" + +static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT; +static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT; +static u64 max_lun = IBMVFC_MAX_LUN; +static unsigned int max_targets = IBMVFC_MAX_TARGETS; +static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; +static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; +static unsigned int ibmvfc_debug = IBMVFC_DEBUG; +static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; +static unsigned int cls3_error = IBMVFC_CLS3_ERROR; +static LIST_HEAD(ibmvfc_head); +static DEFINE_SPINLOCK(ibmvfc_driver_lock); +static struct scsi_transport_template *ibmvfc_transport_template; + +MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver"); +MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(IBMVFC_DRIVER_VERSION); + +module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. " + "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]"); +module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(default_timeout, + "Default timeout in seconds for initialization and EH commands. " + "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]"); +module_param_named(max_requests, max_requests, uint, S_IRUGO); +MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. " + "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]"); +module_param_named(max_lun, max_lun, ullong, S_IRUGO); +MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. " + "[Default=" __stringify(IBMVFC_MAX_LUN) "]"); +module_param_named(max_targets, max_targets, uint, S_IRUGO); +MODULE_PARM_DESC(max_targets, "Maximum allowed targets. " + "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]"); +module_param_named(disc_threads, disc_threads, uint, S_IRUGO); +MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. " + "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]"); +module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Enable driver debug information. " + "[Default=" __stringify(IBMVFC_DEBUG) "]"); +module_param_named(log_level, log_level, uint, 0); +MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " + "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); +module_param_named(cls3_error, cls3_error, uint, 0); +MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. " + "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]"); + +static const struct { + u16 status; + u16 error; + u8 result; + u8 retry; + int log; + char *name; +} cmd_status [] = { + { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" }, + { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" }, + + { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" }, + { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" }, + + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" }, + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" }, + { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" }, + { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" }, + { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" }, + { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" }, + { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" }, + { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" }, + { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" }, + { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" }, + { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" }, + + { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" }, +}; + +static void ibmvfc_npiv_login(struct ibmvfc_host *); +static void ibmvfc_tgt_send_prli(struct ibmvfc_target *); +static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *); +static void ibmvfc_tgt_query_target(struct ibmvfc_target *); +static void ibmvfc_npiv_logout(struct ibmvfc_host *); + +static const char *unknown_error = "unknown error"; + +#ifdef CONFIG_SCSI_IBMVFC_TRACE +/** + * ibmvfc_trc_start - Log a start trace entry + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_trc_start(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; + struct ibmvfc_mad_common *mad = &evt->iu.mad_common; + struct ibmvfc_trace_entry *entry; + + entry = &vhost->trace[vhost->trace_index++]; + entry->evt = evt; + entry->time = jiffies; + entry->fmt = evt->crq.format; + entry->type = IBMVFC_TRC_START; + + switch (entry->fmt) { + case IBMVFC_CMD_FORMAT: + entry->op_code = vfc_cmd->iu.cdb[0]; + entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); + entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); + entry->tmf_flags = vfc_cmd->iu.tmf_flags; + entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len); + break; + case IBMVFC_MAD_FORMAT: + entry->op_code = be32_to_cpu(mad->opcode); + break; + default: + break; + } +} + +/** + * ibmvfc_trc_end - Log an end trace entry + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_trc_end(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; + struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common; + struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++]; + + entry->evt = evt; + entry->time = jiffies; + entry->fmt = evt->crq.format; + entry->type = IBMVFC_TRC_END; + + switch (entry->fmt) { + case IBMVFC_CMD_FORMAT: + entry->op_code = vfc_cmd->iu.cdb[0]; + entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); + entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); + entry->tmf_flags = vfc_cmd->iu.tmf_flags; + entry->u.end.status = be16_to_cpu(vfc_cmd->status); + entry->u.end.error = be16_to_cpu(vfc_cmd->error); + entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags; + entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code; + entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status; + break; + case IBMVFC_MAD_FORMAT: + entry->op_code = be32_to_cpu(mad->opcode); + entry->u.end.status = be16_to_cpu(mad->status); + break; + default: + break; + + } +} + +#else +#define ibmvfc_trc_start(evt) do { } while (0) +#define ibmvfc_trc_end(evt) do { } while (0) +#endif + +/** + * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response + * @status: status / error class + * @error: error + * + * Return value: + * index into cmd_status / -EINVAL on failure + **/ +static int ibmvfc_get_err_index(u16 status, u16 error) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(cmd_status); i++) + if ((cmd_status[i].status & status) == cmd_status[i].status && + cmd_status[i].error == error) + return i; + + return -EINVAL; +} + +/** + * ibmvfc_get_cmd_error - Find the error description for the fcp response + * @status: status / error class + * @error: error + * + * Return value: + * error description string + **/ +static const char *ibmvfc_get_cmd_error(u16 status, u16 error) +{ + int rc = ibmvfc_get_err_index(status, error); + if (rc >= 0) + return cmd_status[rc].name; + return unknown_error; +} + +/** + * ibmvfc_get_err_result - Find the scsi status to return for the fcp response + * @vfc_cmd: ibmvfc command struct + * + * Return value: + * SCSI result value to return for completed command + **/ +static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd) +{ + int err; + struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; + int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len); + + if ((rsp->flags & FCP_RSP_LEN_VALID) && + ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) || + rsp->data.info.rsp_code)) + return DID_ERROR << 16; + + err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); + if (err >= 0) + return rsp->scsi_status | (cmd_status[err].result << 16); + return rsp->scsi_status | (DID_ERROR << 16); +} + +/** + * ibmvfc_retry_cmd - Determine if error status is retryable + * @status: status / error class + * @error: error + * + * Return value: + * 1 if error should be retried / 0 if it should not + **/ +static int ibmvfc_retry_cmd(u16 status, u16 error) +{ + int rc = ibmvfc_get_err_index(status, error); + + if (rc >= 0) + return cmd_status[rc].retry; + return 1; +} + +static const char *unknown_fc_explain = "unknown fc explain"; + +static const struct { + u16 fc_explain; + char *name; +} ls_explain [] = { + { 0x00, "no additional explanation" }, + { 0x01, "service parameter error - options" }, + { 0x03, "service parameter error - initiator control" }, + { 0x05, "service parameter error - recipient control" }, + { 0x07, "service parameter error - received data field size" }, + { 0x09, "service parameter error - concurrent seq" }, + { 0x0B, "service parameter error - credit" }, + { 0x0D, "invalid N_Port/F_Port_Name" }, + { 0x0E, "invalid node/Fabric Name" }, + { 0x0F, "invalid common service parameters" }, + { 0x11, "invalid association header" }, + { 0x13, "association header required" }, + { 0x15, "invalid originator S_ID" }, + { 0x17, "invalid OX_ID-RX-ID combination" }, + { 0x19, "command (request) already in progress" }, + { 0x1E, "N_Port Login requested" }, + { 0x1F, "Invalid N_Port_ID" }, +}; + +static const struct { + u16 fc_explain; + char *name; +} gs_explain [] = { + { 0x00, "no additional explanation" }, + { 0x01, "port identifier not registered" }, + { 0x02, "port name not registered" }, + { 0x03, "node name not registered" }, + { 0x04, "class of service not registered" }, + { 0x06, "initial process associator not registered" }, + { 0x07, "FC-4 TYPEs not registered" }, + { 0x08, "symbolic port name not registered" }, + { 0x09, "symbolic node name not registered" }, + { 0x0A, "port type not registered" }, + { 0xF0, "authorization exception" }, + { 0xF1, "authentication exception" }, + { 0xF2, "data base full" }, + { 0xF3, "data base empty" }, + { 0xF4, "processing request" }, + { 0xF5, "unable to verify connection" }, + { 0xF6, "devices not in a common zone" }, +}; + +/** + * ibmvfc_get_ls_explain - Return the FC Explain description text + * @status: FC Explain status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_ls_explain(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ls_explain); i++) + if (ls_explain[i].fc_explain == status) + return ls_explain[i].name; + + return unknown_fc_explain; +} + +/** + * ibmvfc_get_gs_explain - Return the FC Explain description text + * @status: FC Explain status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_gs_explain(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(gs_explain); i++) + if (gs_explain[i].fc_explain == status) + return gs_explain[i].name; + + return unknown_fc_explain; +} + +static const struct { + enum ibmvfc_fc_type fc_type; + char *name; +} fc_type [] = { + { IBMVFC_FABRIC_REJECT, "fabric reject" }, + { IBMVFC_PORT_REJECT, "port reject" }, + { IBMVFC_LS_REJECT, "ELS reject" }, + { IBMVFC_FABRIC_BUSY, "fabric busy" }, + { IBMVFC_PORT_BUSY, "port busy" }, + { IBMVFC_BASIC_REJECT, "basic reject" }, +}; + +static const char *unknown_fc_type = "unknown fc type"; + +/** + * ibmvfc_get_fc_type - Return the FC Type description text + * @status: FC Type error status + * + * Returns: + * error string + **/ +static const char *ibmvfc_get_fc_type(u16 status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(fc_type); i++) + if (fc_type[i].fc_type == status) + return fc_type[i].name; + + return unknown_fc_type; +} + +/** + * ibmvfc_set_tgt_action - Set the next init action for the target + * @tgt: ibmvfc target struct + * @action: action to perform + * + **/ +static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt, + enum ibmvfc_target_action action) +{ + switch (tgt->action) { + case IBMVFC_TGT_ACTION_DEL_RPORT: + if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) + tgt->action = action; + case IBMVFC_TGT_ACTION_DELETED_RPORT: + break; + default: + if (action == IBMVFC_TGT_ACTION_DEL_RPORT) + tgt->add_rport = 0; + tgt->action = action; + break; + } +} + +/** + * ibmvfc_set_host_state - Set the state for the host + * @vhost: ibmvfc host struct + * @state: state to set host to + * + * Returns: + * 0 if state changed / non-zero if not changed + **/ +static int ibmvfc_set_host_state(struct ibmvfc_host *vhost, + enum ibmvfc_host_state state) +{ + int rc = 0; + + switch (vhost->state) { + case IBMVFC_HOST_OFFLINE: + rc = -EINVAL; + break; + default: + vhost->state = state; + break; + } + + return rc; +} + +/** + * ibmvfc_set_host_action - Set the next init action for the host + * @vhost: ibmvfc host struct + * @action: action to perform + * + **/ +static void ibmvfc_set_host_action(struct ibmvfc_host *vhost, + enum ibmvfc_host_action action) +{ + switch (action) { + case IBMVFC_HOST_ACTION_ALLOC_TGTS: + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_LOGO_WAIT: + if (vhost->action == IBMVFC_HOST_ACTION_LOGO) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_INIT_WAIT: + if (vhost->action == IBMVFC_HOST_ACTION_INIT) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_QUERY: + switch (vhost->action) { + case IBMVFC_HOST_ACTION_INIT_WAIT: + case IBMVFC_HOST_ACTION_NONE: + case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: + vhost->action = action; + break; + default: + break; + } + break; + case IBMVFC_HOST_ACTION_TGT_INIT: + if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS) + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_REENABLE: + case IBMVFC_HOST_ACTION_RESET: + vhost->action = action; + break; + case IBMVFC_HOST_ACTION_INIT: + case IBMVFC_HOST_ACTION_TGT_DEL: + case IBMVFC_HOST_ACTION_LOGO: + case IBMVFC_HOST_ACTION_QUERY_TGTS: + case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: + case IBMVFC_HOST_ACTION_NONE: + default: + switch (vhost->action) { + case IBMVFC_HOST_ACTION_RESET: + case IBMVFC_HOST_ACTION_REENABLE: + break; + default: + vhost->action = action; + break; + } + break; + } +} + +/** + * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login) + * @vhost: ibmvfc host struct + * + * Return value: + * nothing + **/ +static void ibmvfc_reinit_host(struct ibmvfc_host *vhost) +{ + if (vhost->action == IBMVFC_HOST_ACTION_NONE) { + if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { + scsi_block_requests(vhost->host); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); + } + } else + vhost->reinit = 1; + + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_link_down - Handle a link down event from the adapter + * @vhost: ibmvfc host struct + * @state: ibmvfc host state to enter + * + **/ +static void ibmvfc_link_down(struct ibmvfc_host *vhost, + enum ibmvfc_host_state state) +{ + struct ibmvfc_target *tgt; + + ENTER; + scsi_block_requests(vhost->host); + list_for_each_entry(tgt, &vhost->targets, queue) + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + ibmvfc_set_host_state(vhost, state); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); + vhost->events_to_log |= IBMVFC_AE_LINKDOWN; + wake_up(&vhost->work_wait_q); + LEAVE; +} + +/** + * ibmvfc_init_host - Start host initialization + * @vhost: ibmvfc host struct + * + * Return value: + * nothing + **/ +static void ibmvfc_init_host(struct ibmvfc_host *vhost) +{ + struct ibmvfc_target *tgt; + + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { + if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { + dev_err(vhost->dev, + "Host initialization retries exceeded. Taking adapter offline\n"); + ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); + return; + } + } + + if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { + memset(vhost->async_crq.msgs, 0, PAGE_SIZE); + vhost->async_crq.cur = 0; + + list_for_each_entry(tgt, &vhost->targets, queue) + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + scsi_block_requests(vhost->host); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); + vhost->job_step = ibmvfc_npiv_login; + wake_up(&vhost->work_wait_q); + } +} + +/** + * ibmvfc_send_crq - Send a CRQ + * @vhost: ibmvfc host struct + * @word1: the first 64 bits of the data + * @word2: the second 64 bits of the data + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2) +{ + struct vio_dev *vdev = to_vio_dev(vhost->dev); + return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); +} + +/** + * ibmvfc_send_crq_init - Send a CRQ init message + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost) +{ + ibmvfc_dbg(vhost, "Sending CRQ init\n"); + return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0); +} + +/** + * ibmvfc_send_crq_init_complete - Send a CRQ init complete message + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost) +{ + ibmvfc_dbg(vhost, "Sending CRQ init complete\n"); + return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0); +} + +/** + * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ + * @vhost: ibmvfc host struct + * + * Frees irq, deallocates a page for messages, unmaps dma, and unregisters + * the crq with the hypervisor. + **/ +static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost) +{ + long rc = 0; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + struct ibmvfc_crq_queue *crq = &vhost->crq; + + ibmvfc_dbg(vhost, "Releasing CRQ\n"); + free_irq(vdev->irq, vhost); + tasklet_kill(&vhost->tasklet); + do { + if (rc) + msleep(100); + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + vhost->state = IBMVFC_NO_CRQ; + vhost->logged_in = 0; + dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); + free_page((unsigned long)crq->msgs); +} + +/** + * ibmvfc_reenable_crq_queue - reenables the CRQ + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost) +{ + int rc = 0; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + + /* Re-enable the CRQ */ + do { + if (rc) + msleep(100); + rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); + } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + if (rc) + dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc); + + return rc; +} + +/** + * ibmvfc_reset_crq - resets a crq after a failure + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_reset_crq(struct ibmvfc_host *vhost) +{ + int rc = 0; + unsigned long flags; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + struct ibmvfc_crq_queue *crq = &vhost->crq; + + /* Close the CRQ */ + do { + if (rc) + msleep(100); + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); + + spin_lock_irqsave(vhost->host->host_lock, flags); + vhost->state = IBMVFC_NO_CRQ; + vhost->logged_in = 0; + + /* Clean out the queue */ + memset(crq->msgs, 0, PAGE_SIZE); + crq->cur = 0; + + /* And re-open it again */ + rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, + crq->msg_token, PAGE_SIZE); + + if (rc == H_CLOSED) + /* Adapter is good, but other end is not ready */ + dev_warn(vhost->dev, "Partner adapter not ready\n"); + else if (rc != 0) + dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + return rc; +} + +/** + * ibmvfc_valid_event - Determines if event is valid. + * @pool: event_pool that contains the event + * @evt: ibmvfc event to be checked for validity + * + * Return value: + * 1 if event is valid / 0 if event is not valid + **/ +static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool, + struct ibmvfc_event *evt) +{ + int index = evt - pool->events; + if (index < 0 || index >= pool->size) /* outside of bounds */ + return 0; + if (evt != pool->events + index) /* unaligned */ + return 0; + return 1; +} + +/** + * ibmvfc_free_event - Free the specified event + * @evt: ibmvfc_event to be freed + * + **/ +static void ibmvfc_free_event(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_event_pool *pool = &vhost->pool; + + BUG_ON(!ibmvfc_valid_event(pool, evt)); + BUG_ON(atomic_inc_return(&evt->free) != 1); + list_add_tail(&evt->queue, &vhost->free); +} + +/** + * ibmvfc_scsi_eh_done - EH done function for queuecommand commands + * @evt: ibmvfc event struct + * + * This function does not setup any error status, that must be done + * before this function gets called. + **/ +static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt) +{ + struct scsi_cmnd *cmnd = evt->cmnd; + + if (cmnd) { + scsi_dma_unmap(cmnd); + cmnd->scsi_done(cmnd); + } + + if (evt->eh_comp) + complete(evt->eh_comp); + + ibmvfc_free_event(evt); +} + +/** + * ibmvfc_fail_request - Fail request with specified error code + * @evt: ibmvfc event struct + * @error_code: error code to fail request with + * + * Return value: + * none + **/ +static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code) +{ + if (evt->cmnd) { + evt->cmnd->result = (error_code << 16); + evt->done = ibmvfc_scsi_eh_done; + } else + evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED); + + list_del(&evt->queue); + del_timer(&evt->timer); + ibmvfc_trc_end(evt); + evt->done(evt); +} + +/** + * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests + * @vhost: ibmvfc host struct + * @error_code: error code to fail requests with + * + * Return value: + * none + **/ +static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code) +{ + struct ibmvfc_event *evt, *pos; + + ibmvfc_dbg(vhost, "Purging all requests\n"); + list_for_each_entry_safe(evt, pos, &vhost->sent, queue) + ibmvfc_fail_request(evt, error_code); +} + +/** + * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ + * @vhost: struct ibmvfc host to reset + **/ +static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost) +{ + ibmvfc_purge_requests(vhost, DID_ERROR); + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); +} + +/** + * __ibmvfc_reset_host - Reset the connection to the server (no locking) + * @vhost: struct ibmvfc host to reset + **/ +static void __ibmvfc_reset_host(struct ibmvfc_host *vhost) +{ + if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT && + !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { + scsi_block_requests(vhost->host); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO); + vhost->job_step = ibmvfc_npiv_logout; + wake_up(&vhost->work_wait_q); + } else + ibmvfc_hard_reset_host(vhost); +} + +/** + * ibmvfc_reset_host - Reset the connection to the server + * @vhost: ibmvfc host struct + **/ +static void ibmvfc_reset_host(struct ibmvfc_host *vhost) +{ + unsigned long flags; + + spin_lock_irqsave(vhost->host->host_lock, flags); + __ibmvfc_reset_host(vhost); + spin_unlock_irqrestore(vhost->host->host_lock, flags); +} + +/** + * ibmvfc_retry_host_init - Retry host initialization if allowed + * @vhost: ibmvfc host struct + * + * Returns: 1 if init will be retried / 0 if not + * + **/ +static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost) +{ + int retry = 0; + + if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { + vhost->delay_init = 1; + if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { + dev_err(vhost->dev, + "Host initialization retries exceeded. Taking adapter offline\n"); + ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); + } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES) + __ibmvfc_reset_host(vhost); + else { + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); + retry = 1; + } + } + + wake_up(&vhost->work_wait_q); + return retry; +} + +/** + * __ibmvfc_get_target - Find the specified scsi_target (no locking) + * @starget: scsi target struct + * + * Return value: + * ibmvfc_target struct / NULL if not found + **/ +static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_host *vhost = shost_priv(shost); + struct ibmvfc_target *tgt; + + list_for_each_entry(tgt, &vhost->targets, queue) + if (tgt->target_id == starget->id) { + kref_get(&tgt->kref); + return tgt; + } + return NULL; +} + +/** + * ibmvfc_get_target - Find the specified scsi_target + * @starget: scsi target struct + * + * Return value: + * ibmvfc_target struct / NULL if not found + **/ +static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_target *tgt; + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + tgt = __ibmvfc_get_target(starget); + spin_unlock_irqrestore(shost->host_lock, flags); + return tgt; +} + +/** + * ibmvfc_get_host_speed - Get host port speed + * @shost: scsi host struct + * + * Return value: + * none + **/ +static void ibmvfc_get_host_speed(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + if (vhost->state == IBMVFC_ACTIVE) { + switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) { + case 1: + fc_host_speed(shost) = FC_PORTSPEED_1GBIT; + break; + case 2: + fc_host_speed(shost) = FC_PORTSPEED_2GBIT; + break; + case 4: + fc_host_speed(shost) = FC_PORTSPEED_4GBIT; + break; + case 8: + fc_host_speed(shost) = FC_PORTSPEED_8GBIT; + break; + case 10: + fc_host_speed(shost) = FC_PORTSPEED_10GBIT; + break; + case 16: + fc_host_speed(shost) = FC_PORTSPEED_16GBIT; + break; + default: + ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n", + be64_to_cpu(vhost->login_buf->resp.link_speed) / 100); + fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; + break; + } + } else + fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; + spin_unlock_irqrestore(shost->host_lock, flags); +} + +/** + * ibmvfc_get_host_port_state - Get host port state + * @shost: scsi host struct + * + * Return value: + * none + **/ +static void ibmvfc_get_host_port_state(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + switch (vhost->state) { + case IBMVFC_INITIALIZING: + case IBMVFC_ACTIVE: + fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; + break; + case IBMVFC_LINK_DOWN: + fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; + break; + case IBMVFC_LINK_DEAD: + case IBMVFC_HOST_OFFLINE: + fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; + break; + case IBMVFC_HALTED: + fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED; + break; + case IBMVFC_NO_CRQ: + fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; + break; + default: + ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state); + fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; + break; + } + spin_unlock_irqrestore(shost->host_lock, flags); +} + +/** + * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout + * @rport: rport struct + * @timeout: timeout value + * + * Return value: + * none + **/ +static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) +{ + if (timeout) + rport->dev_loss_tmo = timeout; + else + rport->dev_loss_tmo = 1; +} + +/** + * ibmvfc_release_tgt - Free memory allocated for a target + * @kref: kref struct + * + **/ +static void ibmvfc_release_tgt(struct kref *kref) +{ + struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref); + kfree(tgt); +} + +/** + * ibmvfc_get_starget_node_name - Get SCSI target's node name + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_node_name(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_get_target(starget); + fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; + if (tgt) + kref_put(&tgt->kref, ibmvfc_release_tgt); +} + +/** + * ibmvfc_get_starget_port_name - Get SCSI target's port name + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_port_name(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_get_target(starget); + fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; + if (tgt) + kref_put(&tgt->kref, ibmvfc_release_tgt); +} + +/** + * ibmvfc_get_starget_port_id - Get SCSI target's port ID + * @starget: scsi target struct + * + * Return value: + * none + **/ +static void ibmvfc_get_starget_port_id(struct scsi_target *starget) +{ + struct ibmvfc_target *tgt = ibmvfc_get_target(starget); + fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; + if (tgt) + kref_put(&tgt->kref, ibmvfc_release_tgt); +} + +/** + * ibmvfc_wait_while_resetting - Wait while the host resets + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost) +{ + long timeout = wait_event_timeout(vhost->init_wait_q, + ((vhost->state == IBMVFC_ACTIVE || + vhost->state == IBMVFC_HOST_OFFLINE || + vhost->state == IBMVFC_LINK_DEAD) && + vhost->action == IBMVFC_HOST_ACTION_NONE), + (init_timeout * HZ)); + + return timeout ? 0 : -EIO; +} + +/** + * ibmvfc_issue_fc_host_lip - Re-initiate link initialization + * @shost: scsi host struct + * + * Return value: + * 0 on success / other on failure + **/ +static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost) +{ + struct ibmvfc_host *vhost = shost_priv(shost); + + dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n"); + ibmvfc_reset_host(vhost); + return ibmvfc_wait_while_resetting(vhost); +} + +/** + * ibmvfc_gather_partition_info - Gather info about the LPAR + * + * Return value: + * none + **/ +static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost) +{ + struct device_node *rootdn; + const char *name; + const unsigned int *num; + + rootdn = of_find_node_by_path("/"); + if (!rootdn) + return; + + name = of_get_property(rootdn, "ibm,partition-name", NULL); + if (name) + strncpy(vhost->partition_name, name, sizeof(vhost->partition_name)); + num = of_get_property(rootdn, "ibm,partition-no", NULL); + if (num) + vhost->partition_number = *num; + of_node_put(rootdn); +} + +/** + * ibmvfc_set_login_info - Setup info for NPIV login + * @vhost: ibmvfc host struct + * + * Return value: + * none + **/ +static void ibmvfc_set_login_info(struct ibmvfc_host *vhost) +{ + struct ibmvfc_npiv_login *login_info = &vhost->login_info; + struct device_node *of_node = vhost->dev->of_node; + const char *location; + + memset(login_info, 0, sizeof(*login_info)); + + login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX); + login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9); + login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu)); + login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp)); + login_info->partition_num = cpu_to_be32(vhost->partition_number); + login_info->vfc_frame_version = cpu_to_be32(1); + login_info->fcp_version = cpu_to_be16(3); + login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT); + if (vhost->client_migrated) + login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED); + + login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ); + login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE); + login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token); + login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs)); + strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME); + strncpy(login_info->device_name, + dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME); + + location = of_get_property(of_node, "ibm,loc-code", NULL); + location = location ? location : dev_name(vhost->dev); + strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME); +} + +/** + * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host + * @vhost: ibmvfc host who owns the event pool + * + * Returns zero on success. + **/ +static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost) +{ + int i; + struct ibmvfc_event_pool *pool = &vhost->pool; + + ENTER; + pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ; + pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); + if (!pool->events) + return -ENOMEM; + + pool->iu_storage = dma_alloc_coherent(vhost->dev, + pool->size * sizeof(*pool->iu_storage), + &pool->iu_token, 0); + + if (!pool->iu_storage) { + kfree(pool->events); + return -ENOMEM; + } + + for (i = 0; i < pool->size; ++i) { + struct ibmvfc_event *evt = &pool->events[i]; + atomic_set(&evt->free, 1); + evt->crq.valid = 0x80; + evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i)); + evt->xfer_iu = pool->iu_storage + i; + evt->vhost = vhost; + evt->ext_list = NULL; + list_add_tail(&evt->queue, &vhost->free); + } + + LEAVE; + return 0; +} + +/** + * ibmvfc_free_event_pool - Frees memory of the event pool of a host + * @vhost: ibmvfc host who owns the event pool + * + **/ +static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost) +{ + int i; + struct ibmvfc_event_pool *pool = &vhost->pool; + + ENTER; + for (i = 0; i < pool->size; ++i) { + list_del(&pool->events[i].queue); + BUG_ON(atomic_read(&pool->events[i].free) != 1); + if (pool->events[i].ext_list) + dma_pool_free(vhost->sg_pool, + pool->events[i].ext_list, + pool->events[i].ext_list_token); + } + + kfree(pool->events); + dma_free_coherent(vhost->dev, + pool->size * sizeof(*pool->iu_storage), + pool->iu_storage, pool->iu_token); + LEAVE; +} + +/** + * ibmvfc_get_event - Gets the next free event in pool + * @vhost: ibmvfc host struct + * + * Returns a free event from the pool. + **/ +static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost) +{ + struct ibmvfc_event *evt; + + BUG_ON(list_empty(&vhost->free)); + evt = list_entry(vhost->free.next, struct ibmvfc_event, queue); + atomic_set(&evt->free, 0); + list_del(&evt->queue); + return evt; +} + +/** + * ibmvfc_init_event - Initialize fields in an event struct that are always + * required. + * @evt: The event + * @done: Routine to call when the event is responded to + * @format: SRP or MAD format + **/ +static void ibmvfc_init_event(struct ibmvfc_event *evt, + void (*done) (struct ibmvfc_event *), u8 format) +{ + evt->cmnd = NULL; + evt->sync_iu = NULL; + evt->crq.format = format; + evt->done = done; + evt->eh_comp = NULL; +} + +/** + * ibmvfc_map_sg_list - Initialize scatterlist + * @scmd: scsi command struct + * @nseg: number of scatterlist segments + * @md: memory descriptor list to initialize + **/ +static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg, + struct srp_direct_buf *md) +{ + int i; + struct scatterlist *sg; + + scsi_for_each_sg(scmd, sg, nseg, i) { + md[i].va = cpu_to_be64(sg_dma_address(sg)); + md[i].len = cpu_to_be32(sg_dma_len(sg)); + md[i].key = 0; + } +} + +/** + * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields + * @scmd: struct scsi_cmnd with the scatterlist + * @evt: ibmvfc event struct + * @vfc_cmd: vfc_cmd that contains the memory descriptor + * @dev: device for which to map dma memory + * + * Returns: + * 0 on success / non-zero on failure + **/ +static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd, + struct ibmvfc_event *evt, + struct ibmvfc_cmd *vfc_cmd, struct device *dev) +{ + + int sg_mapped; + struct srp_direct_buf *data = &vfc_cmd->ioba; + struct ibmvfc_host *vhost = dev_get_drvdata(dev); + + if (cls3_error) + vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR); + + sg_mapped = scsi_dma_map(scmd); + if (!sg_mapped) { + vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC); + return 0; + } else if (unlikely(sg_mapped < 0)) { + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n"); + return sg_mapped; + } + + if (scmd->sc_data_direction == DMA_TO_DEVICE) { + vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE); + vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA; + } else { + vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ); + vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA; + } + + if (sg_mapped == 1) { + ibmvfc_map_sg_list(scmd, sg_mapped, data); + return 0; + } + + vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST); + + if (!evt->ext_list) { + evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC, + &evt->ext_list_token); + + if (!evt->ext_list) { + scsi_dma_unmap(scmd); + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n"); + return -ENOMEM; + } + } + + ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list); + + data->va = cpu_to_be64(evt->ext_list_token); + data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf)); + data->key = 0; + return 0; +} + +/** + * ibmvfc_timeout - Internal command timeout handler + * @evt: struct ibmvfc_event that timed out + * + * Called when an internally generated command times out + **/ +static void ibmvfc_timeout(struct timer_list *t) +{ + struct ibmvfc_event *evt = from_timer(evt, t, timer); + struct ibmvfc_host *vhost = evt->vhost; + dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt); + ibmvfc_reset_host(vhost); +} + +/** + * ibmvfc_send_event - Transforms event to u64 array and calls send_crq() + * @evt: event to be sent + * @vhost: ibmvfc host struct + * @timeout: timeout in seconds - 0 means do not time command + * + * Returns the value returned from ibmvfc_send_crq(). (Zero for success) + **/ +static int ibmvfc_send_event(struct ibmvfc_event *evt, + struct ibmvfc_host *vhost, unsigned long timeout) +{ + __be64 *crq_as_u64 = (__be64 *) &evt->crq; + int rc; + + /* Copy the IU into the transfer area */ + *evt->xfer_iu = evt->iu; + if (evt->crq.format == IBMVFC_CMD_FORMAT) + evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt); + else if (evt->crq.format == IBMVFC_MAD_FORMAT) + evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt); + else + BUG(); + + list_add_tail(&evt->queue, &vhost->sent); + timer_setup(&evt->timer, ibmvfc_timeout, 0); + + if (timeout) { + evt->timer.expires = jiffies + (timeout * HZ); + add_timer(&evt->timer); + } + + mb(); + + if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]), + be64_to_cpu(crq_as_u64[1])))) { + list_del(&evt->queue); + del_timer(&evt->timer); + + /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. + * Firmware will send a CRQ with a transport event (0xFF) to + * tell this client what has happened to the transport. This + * will be handled in ibmvfc_handle_crq() + */ + if (rc == H_CLOSED) { + if (printk_ratelimit()) + dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n"); + if (evt->cmnd) + scsi_dma_unmap(evt->cmnd); + ibmvfc_free_event(evt); + return SCSI_MLQUEUE_HOST_BUSY; + } + + dev_err(vhost->dev, "Send error (rc=%d)\n", rc); + if (evt->cmnd) { + evt->cmnd->result = DID_ERROR << 16; + evt->done = ibmvfc_scsi_eh_done; + } else + evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR); + + evt->done(evt); + } else + ibmvfc_trc_start(evt); + + return 0; +} + +/** + * ibmvfc_log_error - Log an error for the failed command if appropriate + * @evt: ibmvfc event to log + * + **/ +static void ibmvfc_log_error(struct ibmvfc_event *evt) +{ + struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; + struct scsi_cmnd *cmnd = evt->cmnd; + const char *err = unknown_error; + int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); + int logerr = 0; + int rsp_code = 0; + + if (index >= 0) { + logerr = cmd_status[index].log; + err = cmd_status[index].name; + } + + if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1))) + return; + + if (rsp->flags & FCP_RSP_LEN_VALID) + rsp_code = rsp->data.info.rsp_code; + + scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) " + "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n", + cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error, + rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status); +} + +/** + * ibmvfc_relogin - Log back into the specified device + * @sdev: scsi device struct + * + **/ +static void ibmvfc_relogin(struct scsi_device *sdev) +{ + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct ibmvfc_target *tgt; + + list_for_each_entry(tgt, &vhost->targets, queue) { + if (rport == tgt->rport) { + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + break; + } + } + + ibmvfc_reinit_host(vhost); +} + +/** + * ibmvfc_scsi_done - Handle responses from commands + * @evt: ibmvfc event to be handled + * + * Used as a callback when sending scsi cmds. + **/ +static void ibmvfc_scsi_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; + struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; + struct scsi_cmnd *cmnd = evt->cmnd; + u32 rsp_len = 0; + u32 sense_len = be32_to_cpu(rsp->fcp_sense_len); + + if (cmnd) { + if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID) + scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid)); + else if (rsp->flags & FCP_RESID_UNDER) + scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid)); + else + scsi_set_resid(cmnd, 0); + + if (vfc_cmd->status) { + cmnd->result = ibmvfc_get_err_result(vfc_cmd); + + if (rsp->flags & FCP_RSP_LEN_VALID) + rsp_len = be32_to_cpu(rsp->fcp_rsp_len); + if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE) + sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len; + if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8) + memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len); + if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) && + (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED)) + ibmvfc_relogin(cmnd->device); + + if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER))) + cmnd->result = (DID_ERROR << 16); + + ibmvfc_log_error(evt); + } + + if (!cmnd->result && + (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow)) + cmnd->result = (DID_ERROR << 16); + + scsi_dma_unmap(cmnd); + cmnd->scsi_done(cmnd); + } + + if (evt->eh_comp) + complete(evt->eh_comp); + + ibmvfc_free_event(evt); +} + +/** + * ibmvfc_host_chkready - Check if the host can accept commands + * @vhost: struct ibmvfc host + * + * Returns: + * 1 if host can accept command / 0 if not + **/ +static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost) +{ + int result = 0; + + switch (vhost->state) { + case IBMVFC_LINK_DEAD: + case IBMVFC_HOST_OFFLINE: + result = DID_NO_CONNECT << 16; + break; + case IBMVFC_NO_CRQ: + case IBMVFC_INITIALIZING: + case IBMVFC_HALTED: + case IBMVFC_LINK_DOWN: + result = DID_REQUEUE << 16; + break; + case IBMVFC_ACTIVE: + result = 0; + break; + } + + return result; +} + +/** + * ibmvfc_queuecommand - The queuecommand function of the scsi template + * @cmnd: struct scsi_cmnd to be executed + * @done: Callback function to be called when cmnd is completed + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd, + void (*done) (struct scsi_cmnd *)) +{ + struct ibmvfc_host *vhost = shost_priv(cmnd->device->host); + struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); + struct ibmvfc_cmd *vfc_cmd; + struct ibmvfc_event *evt; + int rc; + + if (unlikely((rc = fc_remote_port_chkready(rport))) || + unlikely((rc = ibmvfc_host_chkready(vhost)))) { + cmnd->result = rc; + done(cmnd); + return 0; + } + + cmnd->result = (DID_OK << 16); + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT); + evt->cmnd = cmnd; + cmnd->scsi_done = done; + vfc_cmd = &evt->iu.cmd; + memset(vfc_cmd, 0, sizeof(*vfc_cmd)); + vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp)); + vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp)); + vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE); + vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu)); + vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp)); + vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata); + vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id); + vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd)); + int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun); + memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len); + + if (cmnd->flags & SCMD_TAGGED) { + vfc_cmd->task_tag = cpu_to_be64(cmnd->tag); + vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK; + } + + if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev)))) + return ibmvfc_send_event(evt, vhost, 0); + + ibmvfc_free_event(evt); + if (rc == -ENOMEM) + return SCSI_MLQUEUE_HOST_BUSY; + + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + scmd_printk(KERN_ERR, cmnd, + "Failed to map DMA buffer for command. rc=%d\n", rc); + + cmnd->result = DID_ERROR << 16; + done(cmnd); + return 0; +} + +static DEF_SCSI_QCMD(ibmvfc_queuecommand) + +/** + * ibmvfc_sync_completion - Signal that a synchronous command has completed + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_sync_completion(struct ibmvfc_event *evt) +{ + /* copy the response back */ + if (evt->sync_iu) + *evt->sync_iu = *evt->xfer_iu; + + complete(&evt->comp); +} + +/** + * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands + * @evt: struct ibmvfc_event + * + **/ +static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + + ibmvfc_free_event(evt); + vhost->aborting_passthru = 0; + dev_info(vhost->dev, "Passthru command cancelled\n"); +} + +/** + * ibmvfc_bsg_timeout - Handle a BSG timeout + * @job: struct bsg_job that timed out + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_bsg_timeout(struct bsg_job *job) +{ + struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); + unsigned long port_id = (unsigned long)job->dd_data; + struct ibmvfc_event *evt; + struct ibmvfc_tmf *tmf; + unsigned long flags; + int rc; + + ENTER; + spin_lock_irqsave(vhost->host->host_lock, flags); + if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) { + __ibmvfc_reset_host(vhost); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return 0; + } + + vhost->aborting_passthru = 1; + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT); + + tmf = &evt->iu.tmf; + memset(tmf, 0, sizeof(*tmf)); + tmf->common.version = cpu_to_be32(1); + tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); + tmf->common.length = cpu_to_be16(sizeof(*tmf)); + tmf->scsi_id = cpu_to_be64(port_id); + tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); + tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY); + rc = ibmvfc_send_event(evt, vhost, default_timeout); + + if (rc != 0) { + vhost->aborting_passthru = 0; + dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc); + rc = -EIO; + } else + dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n", + port_id); + + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + LEAVE; + return rc; +} + +/** + * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command + * @vhost: struct ibmvfc_host to send command + * @port_id: port ID to send command + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id) +{ + struct ibmvfc_port_login *plogi; + struct ibmvfc_target *tgt; + struct ibmvfc_event *evt; + union ibmvfc_iu rsp_iu; + unsigned long flags; + int rc = 0, issue_login = 1; + + ENTER; + spin_lock_irqsave(vhost->host->host_lock, flags); + list_for_each_entry(tgt, &vhost->targets, queue) { + if (tgt->scsi_id == port_id) { + issue_login = 0; + break; + } + } + + if (!issue_login) + goto unlock_out; + if (unlikely((rc = ibmvfc_host_chkready(vhost)))) + goto unlock_out; + + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); + plogi = &evt->iu.plogi; + memset(plogi, 0, sizeof(*plogi)); + plogi->common.version = cpu_to_be32(1); + plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); + plogi->common.length = cpu_to_be16(sizeof(*plogi)); + plogi->scsi_id = cpu_to_be64(port_id); + evt->sync_iu = &rsp_iu; + init_completion(&evt->comp); + + rc = ibmvfc_send_event(evt, vhost, default_timeout); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rc) + return -EIO; + + wait_for_completion(&evt->comp); + + if (rsp_iu.plogi.common.status) + rc = -EIO; + + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); +unlock_out: + spin_unlock_irqrestore(vhost->host->host_lock, flags); + LEAVE; + return rc; +} + +/** + * ibmvfc_bsg_request - Handle a BSG request + * @job: struct bsg_job to be executed + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_bsg_request(struct bsg_job *job) +{ + struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); + struct fc_rport *rport = fc_bsg_to_rport(job); + struct ibmvfc_passthru_mad *mad; + struct ibmvfc_event *evt; + union ibmvfc_iu rsp_iu; + unsigned long flags, port_id = -1; + struct fc_bsg_request *bsg_request = job->request; + struct fc_bsg_reply *bsg_reply = job->reply; + unsigned int code = bsg_request->msgcode; + int rc = 0, req_seg, rsp_seg, issue_login = 0; + u32 fc_flags, rsp_len; + + ENTER; + bsg_reply->reply_payload_rcv_len = 0; + if (rport) + port_id = rport->port_id; + + switch (code) { + case FC_BSG_HST_ELS_NOLOGIN: + port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) | + (bsg_request->rqst_data.h_els.port_id[1] << 8) | + bsg_request->rqst_data.h_els.port_id[2]; + case FC_BSG_RPT_ELS: + fc_flags = IBMVFC_FC_ELS; + break; + case FC_BSG_HST_CT: + issue_login = 1; + port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) | + (bsg_request->rqst_data.h_ct.port_id[1] << 8) | + bsg_request->rqst_data.h_ct.port_id[2]; + case FC_BSG_RPT_CT: + fc_flags = IBMVFC_FC_CT_IU; + break; + default: + return -ENOTSUPP; + } + + if (port_id == -1) + return -EINVAL; + if (!mutex_trylock(&vhost->passthru_mutex)) + return -EBUSY; + + job->dd_data = (void *)port_id; + req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list, + job->request_payload.sg_cnt, DMA_TO_DEVICE); + + if (!req_seg) { + mutex_unlock(&vhost->passthru_mutex); + return -ENOMEM; + } + + rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list, + job->reply_payload.sg_cnt, DMA_FROM_DEVICE); + + if (!rsp_seg) { + dma_unmap_sg(vhost->dev, job->request_payload.sg_list, + job->request_payload.sg_cnt, DMA_TO_DEVICE); + mutex_unlock(&vhost->passthru_mutex); + return -ENOMEM; + } + + if (req_seg > 1 || rsp_seg > 1) { + rc = -EINVAL; + goto out; + } + + if (issue_login) + rc = ibmvfc_bsg_plogi(vhost, port_id); + + spin_lock_irqsave(vhost->host->host_lock, flags); + + if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) || + unlikely((rc = ibmvfc_host_chkready(vhost)))) { + spin_unlock_irqrestore(vhost->host->host_lock, flags); + goto out; + } + + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); + mad = &evt->iu.passthru; + + memset(mad, 0, sizeof(*mad)); + mad->common.version = cpu_to_be32(1); + mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); + mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); + + mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + + offsetof(struct ibmvfc_passthru_mad, iu)); + mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); + + mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len); + mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len); + mad->iu.flags = cpu_to_be32(fc_flags); + mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); + + mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list)); + mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list)); + mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list)); + mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list)); + mad->iu.scsi_id = cpu_to_be64(port_id); + mad->iu.tag = cpu_to_be64((u64)evt); + rsp_len = be32_to_cpu(mad->iu.rsp.len); + + evt->sync_iu = &rsp_iu; + init_completion(&evt->comp); + rc = ibmvfc_send_event(evt, vhost, 0); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rc) { + rc = -EIO; + goto out; + } + + wait_for_completion(&evt->comp); + + if (rsp_iu.passthru.common.status) + rc = -EIO; + else + bsg_reply->reply_payload_rcv_len = rsp_len; + + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + bsg_reply->result = rc; + bsg_job_done(job, bsg_reply->result, + bsg_reply->reply_payload_rcv_len); + rc = 0; +out: + dma_unmap_sg(vhost->dev, job->request_payload.sg_list, + job->request_payload.sg_cnt, DMA_TO_DEVICE); + dma_unmap_sg(vhost->dev, job->reply_payload.sg_list, + job->reply_payload.sg_cnt, DMA_FROM_DEVICE); + mutex_unlock(&vhost->passthru_mutex); + LEAVE; + return rc; +} + +/** + * ibmvfc_reset_device - Reset the device with the specified reset type + * @sdev: scsi device to reset + * @type: reset type + * @desc: reset type description for log messages + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc) +{ + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct ibmvfc_cmd *tmf; + struct ibmvfc_event *evt = NULL; + union ibmvfc_iu rsp_iu; + struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp; + int rsp_rc = -EBUSY; + unsigned long flags; + int rsp_code = 0; + + spin_lock_irqsave(vhost->host->host_lock, flags); + if (vhost->state == IBMVFC_ACTIVE) { + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); + + tmf = &evt->iu.cmd; + memset(tmf, 0, sizeof(*tmf)); + tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp)); + tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp)); + tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE); + tmf->payload_len = cpu_to_be32(sizeof(tmf->iu)); + tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp)); + tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); + tmf->tgt_scsi_id = cpu_to_be64(rport->port_id); + int_to_scsilun(sdev->lun, &tmf->iu.lun); + tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); + tmf->iu.tmf_flags = type; + evt->sync_iu = &rsp_iu; + + init_completion(&evt->comp); + rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n", + desc, rsp_rc); + return -EIO; + } + + sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc); + wait_for_completion(&evt->comp); + + if (rsp_iu.cmd.status) + rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd); + + if (rsp_code) { + if (fc_rsp->flags & FCP_RSP_LEN_VALID) + rsp_code = fc_rsp->data.info.rsp_code; + + sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) " + "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc, + ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), + rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code, + fc_rsp->scsi_status); + rsp_rc = -EIO; + } else + sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc); + + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return rsp_rc; +} + +/** + * ibmvfc_match_rport - Match function for specified remote port + * @evt: ibmvfc event struct + * @device: device to match (rport) + * + * Returns: + * 1 if event matches rport / 0 if event does not match rport + **/ +static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport) +{ + struct fc_rport *cmd_rport; + + if (evt->cmnd) { + cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device)); + if (cmd_rport == rport) + return 1; + } + return 0; +} + +/** + * ibmvfc_match_target - Match function for specified target + * @evt: ibmvfc event struct + * @device: device to match (starget) + * + * Returns: + * 1 if event matches starget / 0 if event does not match starget + **/ +static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device) +{ + if (evt->cmnd && scsi_target(evt->cmnd->device) == device) + return 1; + return 0; +} + +/** + * ibmvfc_match_lun - Match function for specified LUN + * @evt: ibmvfc event struct + * @device: device to match (sdev) + * + * Returns: + * 1 if event matches sdev / 0 if event does not match sdev + **/ +static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device) +{ + if (evt->cmnd && evt->cmnd->device == device) + return 1; + return 0; +} + +/** + * ibmvfc_wait_for_ops - Wait for ops to complete + * @vhost: ibmvfc host struct + * @device: device to match (starget or sdev) + * @match: match function + * + * Returns: + * SUCCESS / FAILED + **/ +static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device, + int (*match) (struct ibmvfc_event *, void *)) +{ + struct ibmvfc_event *evt; + DECLARE_COMPLETION_ONSTACK(comp); + int wait; + unsigned long flags; + signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ; + + ENTER; + do { + wait = 0; + spin_lock_irqsave(vhost->host->host_lock, flags); + list_for_each_entry(evt, &vhost->sent, queue) { + if (match(evt, device)) { + evt->eh_comp = ∁ + wait++; + } + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (wait) { + timeout = wait_for_completion_timeout(&comp, timeout); + + if (!timeout) { + wait = 0; + spin_lock_irqsave(vhost->host->host_lock, flags); + list_for_each_entry(evt, &vhost->sent, queue) { + if (match(evt, device)) { + evt->eh_comp = NULL; + wait++; + } + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + if (wait) + dev_err(vhost->dev, "Timed out waiting for aborted commands\n"); + LEAVE; + return wait ? FAILED : SUCCESS; + } + } + } while (wait); + + LEAVE; + return SUCCESS; +} + +/** + * ibmvfc_cancel_all - Cancel all outstanding commands to the device + * @sdev: scsi device to cancel commands + * @type: type of error recovery being performed + * + * This sends a cancel to the VIOS for the specified device. This does + * NOT send any abort to the actual device. That must be done separately. + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_cancel_all(struct scsi_device *sdev, int type) +{ + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct scsi_target *starget = scsi_target(sdev); + struct fc_rport *rport = starget_to_rport(starget); + struct ibmvfc_tmf *tmf; + struct ibmvfc_event *evt, *found_evt; + union ibmvfc_iu rsp; + int rsp_rc = -EBUSY; + unsigned long flags; + u16 status; + + ENTER; + spin_lock_irqsave(vhost->host->host_lock, flags); + found_evt = NULL; + list_for_each_entry(evt, &vhost->sent, queue) { + if (evt->cmnd && evt->cmnd->device == sdev) { + found_evt = evt; + break; + } + } + + if (!found_evt) { + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return 0; + } + + if (vhost->logged_in) { + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); + + tmf = &evt->iu.tmf; + memset(tmf, 0, sizeof(*tmf)); + tmf->common.version = cpu_to_be32(1); + tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); + tmf->common.length = cpu_to_be16(sizeof(*tmf)); + tmf->scsi_id = cpu_to_be64(rport->port_id); + int_to_scsilun(sdev->lun, &tmf->lun); + if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS)) + type &= ~IBMVFC_TMF_SUPPRESS_ABTS; + if (vhost->state == IBMVFC_ACTIVE) + tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID)); + else + tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID)); + tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); + tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata); + + evt->sync_iu = &rsp; + init_completion(&evt->comp); + rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); + } + + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc); + /* If failure is received, the host adapter is most likely going + through reset, return success so the caller will wait for the command + being cancelled to get returned */ + return 0; + } + + sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); + + wait_for_completion(&evt->comp); + status = be16_to_cpu(rsp.mad_common.status); + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (status != IBMVFC_MAD_SUCCESS) { + sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); + switch (status) { + case IBMVFC_MAD_DRIVER_FAILED: + case IBMVFC_MAD_CRQ_ERROR: + /* Host adapter most likely going through reset, return success to + the caller will wait for the command being cancelled to get returned */ + return 0; + default: + return -EIO; + }; + } + + sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); + return 0; +} + +/** + * ibmvfc_match_key - Match function for specified cancel key + * @evt: ibmvfc event struct + * @key: cancel key to match + * + * Returns: + * 1 if event matches key / 0 if event does not match key + **/ +static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key) +{ + unsigned long cancel_key = (unsigned long)key; + + if (evt->crq.format == IBMVFC_CMD_FORMAT && + be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key) + return 1; + return 0; +} + +/** + * ibmvfc_match_evt - Match function for specified event + * @evt: ibmvfc event struct + * @match: event to match + * + * Returns: + * 1 if event matches key / 0 if event does not match key + **/ +static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match) +{ + if (evt == match) + return 1; + return 0; +} + +/** + * ibmvfc_abort_task_set - Abort outstanding commands to the device + * @sdev: scsi device to abort commands + * + * This sends an Abort Task Set to the VIOS for the specified device. This does + * NOT send any cancel to the VIOS. That must be done separately. + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_abort_task_set(struct scsi_device *sdev) +{ + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct ibmvfc_cmd *tmf; + struct ibmvfc_event *evt, *found_evt; + union ibmvfc_iu rsp_iu; + struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp; + int rc, rsp_rc = -EBUSY; + unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT; + int rsp_code = 0; + + spin_lock_irqsave(vhost->host->host_lock, flags); + found_evt = NULL; + list_for_each_entry(evt, &vhost->sent, queue) { + if (evt->cmnd && evt->cmnd->device == sdev) { + found_evt = evt; + break; + } + } + + if (!found_evt) { + if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) + sdev_printk(KERN_INFO, sdev, "No events found to abort\n"); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return 0; + } + + if (vhost->state == IBMVFC_ACTIVE) { + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); + + tmf = &evt->iu.cmd; + memset(tmf, 0, sizeof(*tmf)); + tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp)); + tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp)); + tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE); + tmf->payload_len = cpu_to_be32(sizeof(tmf->iu)); + tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp)); + tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); + tmf->tgt_scsi_id = cpu_to_be64(rport->port_id); + int_to_scsilun(sdev->lun, &tmf->iu.lun); + tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); + tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET; + evt->sync_iu = &rsp_iu; + + init_completion(&evt->comp); + rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); + } + + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc); + return -EIO; + } + + sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n"); + timeout = wait_for_completion_timeout(&evt->comp, timeout); + + if (!timeout) { + rc = ibmvfc_cancel_all(sdev, 0); + if (!rc) { + rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); + if (rc == SUCCESS) + rc = 0; + } + + if (rc) { + sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n"); + ibmvfc_reset_host(vhost); + rsp_rc = -EIO; + rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); + + if (rc == SUCCESS) + rsp_rc = 0; + + rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt); + if (rc != SUCCESS) { + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_hard_reset_host(vhost); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + rsp_rc = 0; + } + + goto out; + } + } + + if (rsp_iu.cmd.status) + rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd); + + if (rsp_code) { + if (fc_rsp->flags & FCP_RSP_LEN_VALID) + rsp_code = fc_rsp->data.info.rsp_code; + + sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) " + "flags: %x fcp_rsp: %x, scsi_status: %x\n", + ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), + rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code, + fc_rsp->scsi_status); + rsp_rc = -EIO; + } else + sdev_printk(KERN_INFO, sdev, "Abort successful\n"); + +out: + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_free_event(evt); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return rsp_rc; +} + +/** + * ibmvfc_eh_abort_handler - Abort a command + * @cmd: scsi command to abort + * + * Returns: + * SUCCESS / FAST_IO_FAIL / FAILED + **/ +static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdev = cmd->device; + struct ibmvfc_host *vhost = shost_priv(sdev->host); + int cancel_rc, block_rc; + int rc = FAILED; + + ENTER; + block_rc = fc_block_scsi_eh(cmd); + ibmvfc_wait_while_resetting(vhost); + if (block_rc != FAST_IO_FAIL) { + cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET); + ibmvfc_abort_task_set(sdev); + } else + cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); + + if (!cancel_rc) + rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); + + if (block_rc == FAST_IO_FAIL && rc != FAILED) + rc = FAST_IO_FAIL; + + LEAVE; + return rc; +} + +/** + * ibmvfc_eh_device_reset_handler - Reset a single LUN + * @cmd: scsi command struct + * + * Returns: + * SUCCESS / FAST_IO_FAIL / FAILED + **/ +static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdev = cmd->device; + struct ibmvfc_host *vhost = shost_priv(sdev->host); + int cancel_rc, block_rc, reset_rc = 0; + int rc = FAILED; + + ENTER; + block_rc = fc_block_scsi_eh(cmd); + ibmvfc_wait_while_resetting(vhost); + if (block_rc != FAST_IO_FAIL) { + cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET); + reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN"); + } else + cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); + + if (!cancel_rc && !reset_rc) + rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); + + if (block_rc == FAST_IO_FAIL && rc != FAILED) + rc = FAST_IO_FAIL; + + LEAVE; + return rc; +} + +/** + * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function + * @sdev: scsi device struct + * @data: return code + * + **/ +static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data) +{ + unsigned long *rc = data; + *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); +} + +/** + * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function + * @sdev: scsi device struct + * @data: return code + * + **/ +static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data) +{ + unsigned long *rc = data; + *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET); +} + +/** + * ibmvfc_eh_target_reset_handler - Reset the target + * @cmd: scsi command struct + * + * Returns: + * SUCCESS / FAST_IO_FAIL / FAILED + **/ +static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdev = cmd->device; + struct ibmvfc_host *vhost = shost_priv(sdev->host); + struct scsi_target *starget = scsi_target(sdev); + int block_rc; + int reset_rc = 0; + int rc = FAILED; + unsigned long cancel_rc = 0; + + ENTER; + block_rc = fc_block_scsi_eh(cmd); + ibmvfc_wait_while_resetting(vhost); + if (block_rc != FAST_IO_FAIL) { + starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset); + reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target"); + } else + starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset); + + if (!cancel_rc && !reset_rc) + rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target); + + if (block_rc == FAST_IO_FAIL && rc != FAILED) + rc = FAST_IO_FAIL; + + LEAVE; + return rc; +} + +/** + * ibmvfc_eh_host_reset_handler - Reset the connection to the server + * @cmd: struct scsi_cmnd having problems + * + **/ +static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd) +{ + int rc; + struct ibmvfc_host *vhost = shost_priv(cmd->device->host); + + dev_err(vhost->dev, "Resetting connection due to error recovery\n"); + rc = ibmvfc_issue_fc_host_lip(vhost->host); + + return rc ? FAILED : SUCCESS; +} + +/** + * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport. + * @rport: rport struct + * + * Return value: + * none + **/ +static void ibmvfc_terminate_rport_io(struct fc_rport *rport) +{ + struct Scsi_Host *shost = rport_to_shost(rport); + struct ibmvfc_host *vhost = shost_priv(shost); + struct fc_rport *dev_rport; + struct scsi_device *sdev; + unsigned long rc; + + ENTER; + shost_for_each_device(sdev, shost) { + dev_rport = starget_to_rport(scsi_target(sdev)); + if (dev_rport != rport) + continue; + ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); + } + + rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport); + + if (rc == FAILED) + ibmvfc_issue_fc_host_lip(shost); + LEAVE; +} + +static const struct ibmvfc_async_desc ae_desc [] = { + { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, + { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, + { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, + { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, + { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, + { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL }, + { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL }, + { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL }, + { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL }, + { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL }, + { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL }, + { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL }, + { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL }, +}; + +static const struct ibmvfc_async_desc unknown_ae = { + "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL +}; + +/** + * ibmvfc_get_ae_desc - Get text description for async event + * @ae: async event + * + **/ +static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ae_desc); i++) + if (ae_desc[i].ae == ae) + return &ae_desc[i]; + + return &unknown_ae; +} + +static const struct { + enum ibmvfc_ae_link_state state; + const char *desc; +} link_desc [] = { + { IBMVFC_AE_LS_LINK_UP, " link up" }, + { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" }, + { IBMVFC_AE_LS_LINK_DOWN, " link down" }, + { IBMVFC_AE_LS_LINK_DEAD, " link dead" }, +}; + +/** + * ibmvfc_get_link_state - Get text description for link state + * @state: link state + * + **/ +static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(link_desc); i++) + if (link_desc[i].state == state) + return link_desc[i].desc; + + return ""; +} + +/** + * ibmvfc_handle_async - Handle an async event from the adapter + * @crq: crq to process + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq, + struct ibmvfc_host *vhost) +{ + const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event)); + struct ibmvfc_target *tgt; + + ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx," + " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id), + be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name), + ibmvfc_get_link_state(crq->link_state)); + + switch (be64_to_cpu(crq->event)) { + case IBMVFC_AE_RESUME: + switch (crq->link_state) { + case IBMVFC_AE_LS_LINK_DOWN: + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); + break; + case IBMVFC_AE_LS_LINK_DEAD: + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + break; + case IBMVFC_AE_LS_LINK_UP: + case IBMVFC_AE_LS_LINK_BOUNCED: + default: + vhost->events_to_log |= IBMVFC_AE_LINKUP; + vhost->delay_init = 1; + __ibmvfc_reset_host(vhost); + break; + } + + break; + case IBMVFC_AE_LINK_UP: + vhost->events_to_log |= IBMVFC_AE_LINKUP; + vhost->delay_init = 1; + __ibmvfc_reset_host(vhost); + break; + case IBMVFC_AE_SCN_FABRIC: + case IBMVFC_AE_SCN_DOMAIN: + vhost->events_to_log |= IBMVFC_AE_RSCN; + if (vhost->state < IBMVFC_HALTED) { + vhost->delay_init = 1; + __ibmvfc_reset_host(vhost); + } + break; + case IBMVFC_AE_SCN_NPORT: + case IBMVFC_AE_SCN_GROUP: + vhost->events_to_log |= IBMVFC_AE_RSCN; + ibmvfc_reinit_host(vhost); + break; + case IBMVFC_AE_ELS_LOGO: + case IBMVFC_AE_ELS_PRLO: + case IBMVFC_AE_ELS_PLOGI: + list_for_each_entry(tgt, &vhost->targets, queue) { + if (!crq->scsi_id && !crq->wwpn && !crq->node_name) + break; + if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id) + continue; + if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn) + continue; + if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name) + continue; + if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO) + tgt->logo_rcvd = 1; + if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) { + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + ibmvfc_reinit_host(vhost); + } + } + break; + case IBMVFC_AE_LINK_DOWN: + case IBMVFC_AE_ADAPTER_FAILED: + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); + break; + case IBMVFC_AE_LINK_DEAD: + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + break; + case IBMVFC_AE_HALT: + ibmvfc_link_down(vhost, IBMVFC_HALTED); + break; + default: + dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event); + break; + } +} + +/** + * ibmvfc_handle_crq - Handles and frees received events in the CRQ + * @crq: Command/Response queue + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost) +{ + long rc; + struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); + + switch (crq->valid) { + case IBMVFC_CRQ_INIT_RSP: + switch (crq->format) { + case IBMVFC_CRQ_INIT: + dev_info(vhost->dev, "Partner initialized\n"); + /* Send back a response */ + rc = ibmvfc_send_crq_init_complete(vhost); + if (rc == 0) + ibmvfc_init_host(vhost); + else + dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc); + break; + case IBMVFC_CRQ_INIT_COMPLETE: + dev_info(vhost->dev, "Partner initialization complete\n"); + ibmvfc_init_host(vhost); + break; + default: + dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format); + } + return; + case IBMVFC_CRQ_XPORT_EVENT: + vhost->state = IBMVFC_NO_CRQ; + vhost->logged_in = 0; + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); + if (crq->format == IBMVFC_PARTITION_MIGRATED) { + /* We need to re-setup the interpartition connection */ + dev_info(vhost->dev, "Re-enabling adapter\n"); + vhost->client_migrated = 1; + ibmvfc_purge_requests(vhost, DID_REQUEUE); + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE); + } else { + dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format); + ibmvfc_purge_requests(vhost, DID_ERROR); + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); + } + return; + case IBMVFC_CRQ_CMD_RSP: + break; + default: + dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid); + return; + } + + if (crq->format == IBMVFC_ASYNC_EVENT) + return; + + /* The only kind of payload CRQs we should get are responses to + * things we send. Make sure this response is to something we + * actually sent + */ + if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) { + dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", + crq->ioba); + return; + } + + if (unlikely(atomic_read(&evt->free))) { + dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", + crq->ioba); + return; + } + + del_timer(&evt->timer); + list_del(&evt->queue); + ibmvfc_trc_end(evt); + evt->done(evt); +} + +/** + * ibmvfc_scan_finished - Check if the device scan is done. + * @shost: scsi host struct + * @time: current elapsed time + * + * Returns: + * 0 if scan is not done / 1 if scan is done + **/ +static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time) +{ + unsigned long flags; + struct ibmvfc_host *vhost = shost_priv(shost); + int done = 0; + + spin_lock_irqsave(shost->host_lock, flags); + if (time >= (init_timeout * HZ)) { + dev_info(vhost->dev, "Scan taking longer than %d seconds, " + "continuing initialization\n", init_timeout); + done = 1; + } + + if (vhost->scan_complete) + done = 1; + spin_unlock_irqrestore(shost->host_lock, flags); + return done; +} + +/** + * ibmvfc_slave_alloc - Setup the device's task set value + * @sdev: struct scsi_device device to configure + * + * Set the device's task set value so that error handling works as + * expected. + * + * Returns: + * 0 on success / -ENXIO if device does not exist + **/ +static int ibmvfc_slave_alloc(struct scsi_device *sdev) +{ + struct Scsi_Host *shost = sdev->host; + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags = 0; + + if (!rport || fc_remote_port_chkready(rport)) + return -ENXIO; + + spin_lock_irqsave(shost->host_lock, flags); + sdev->hostdata = (void *)(unsigned long)vhost->task_set++; + spin_unlock_irqrestore(shost->host_lock, flags); + return 0; +} + +/** + * ibmvfc_target_alloc - Setup the target's task set value + * @starget: struct scsi_target + * + * Set the target's task set value so that error handling works as + * expected. + * + * Returns: + * 0 on success / -ENXIO if device does not exist + **/ +static int ibmvfc_target_alloc(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags = 0; + + spin_lock_irqsave(shost->host_lock, flags); + starget->hostdata = (void *)(unsigned long)vhost->task_set++; + spin_unlock_irqrestore(shost->host_lock, flags); + return 0; +} + +/** + * ibmvfc_slave_configure - Configure the device + * @sdev: struct scsi_device device to configure + * + * Enable allow_restart for a device if it is a disk. Adjust the + * queue_depth here also. + * + * Returns: + * 0 + **/ +static int ibmvfc_slave_configure(struct scsi_device *sdev) +{ + struct Scsi_Host *shost = sdev->host; + unsigned long flags = 0; + + spin_lock_irqsave(shost->host_lock, flags); + if (sdev->type == TYPE_DISK) { + sdev->allow_restart = 1; + blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); + } + spin_unlock_irqrestore(shost->host_lock, flags); + return 0; +} + +/** + * ibmvfc_change_queue_depth - Change the device's queue depth + * @sdev: scsi device struct + * @qdepth: depth to set + * @reason: calling context + * + * Return value: + * actual depth set + **/ +static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth) +{ + if (qdepth > IBMVFC_MAX_CMDS_PER_LUN) + qdepth = IBMVFC_MAX_CMDS_PER_LUN; + + return scsi_change_queue_depth(sdev, qdepth); +} + +static ssize_t ibmvfc_show_host_partition_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + + return snprintf(buf, PAGE_SIZE, "%s\n", + vhost->login_buf->resp.partition_name); +} + +static ssize_t ibmvfc_show_host_device_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + + return snprintf(buf, PAGE_SIZE, "%s\n", + vhost->login_buf->resp.device_name); +} + +static ssize_t ibmvfc_show_host_loc_code(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + + return snprintf(buf, PAGE_SIZE, "%s\n", + vhost->login_buf->resp.port_loc_code); +} + +static ssize_t ibmvfc_show_host_drc_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + + return snprintf(buf, PAGE_SIZE, "%s\n", + vhost->login_buf->resp.drc_name); +} + +static ssize_t ibmvfc_show_host_npiv_version(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version); +} + +static ssize_t ibmvfc_show_host_capabilities(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities); +} + +/** + * ibmvfc_show_log_level - Show the adapter's error logging level + * @dev: class device struct + * @buf: buffer + * + * Return value: + * number of bytes printed to buffer + **/ +static ssize_t ibmvfc_show_log_level(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags = 0; + int len; + + spin_lock_irqsave(shost->host_lock, flags); + len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level); + spin_unlock_irqrestore(shost->host_lock, flags); + return len; +} + +/** + * ibmvfc_store_log_level - Change the adapter's error logging level + * @dev: class device struct + * @buf: buffer + * + * Return value: + * number of bytes printed to buffer + **/ +static ssize_t ibmvfc_store_log_level(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags = 0; + + spin_lock_irqsave(shost->host_lock, flags); + vhost->log_level = simple_strtoul(buf, NULL, 10); + spin_unlock_irqrestore(shost->host_lock, flags); + return strlen(buf); +} + +static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL); +static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL); +static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL); +static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL); +static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL); +static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL); +static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR, + ibmvfc_show_log_level, ibmvfc_store_log_level); + +#ifdef CONFIG_SCSI_IBMVFC_TRACE +/** + * ibmvfc_read_trace - Dump the adapter trace + * @filp: open sysfs file + * @kobj: kobject struct + * @bin_attr: bin_attribute struct + * @buf: buffer + * @off: offset + * @count: buffer size + * + * Return value: + * number of bytes printed to buffer + **/ +static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvfc_host *vhost = shost_priv(shost); + unsigned long flags = 0; + int size = IBMVFC_TRACE_SIZE; + char *src = (char *)vhost->trace; + + if (off > size) + return 0; + if (off + count > size) { + size -= off; + count = size; + } + + spin_lock_irqsave(shost->host_lock, flags); + memcpy(buf, &src[off], count); + spin_unlock_irqrestore(shost->host_lock, flags); + return count; +} + +static struct bin_attribute ibmvfc_trace_attr = { + .attr = { + .name = "trace", + .mode = S_IRUGO, + }, + .size = 0, + .read = ibmvfc_read_trace, +}; +#endif + +static struct device_attribute *ibmvfc_attrs[] = { + &dev_attr_partition_name, + &dev_attr_device_name, + &dev_attr_port_loc_code, + &dev_attr_drc_name, + &dev_attr_npiv_version, + &dev_attr_capabilities, + &dev_attr_log_level, + NULL +}; + +static struct scsi_host_template driver_template = { + .module = THIS_MODULE, + .name = "IBM POWER Virtual FC Adapter", + .proc_name = IBMVFC_NAME, + .queuecommand = ibmvfc_queuecommand, + .eh_timed_out = fc_eh_timed_out, + .eh_abort_handler = ibmvfc_eh_abort_handler, + .eh_device_reset_handler = ibmvfc_eh_device_reset_handler, + .eh_target_reset_handler = ibmvfc_eh_target_reset_handler, + .eh_host_reset_handler = ibmvfc_eh_host_reset_handler, + .slave_alloc = ibmvfc_slave_alloc, + .slave_configure = ibmvfc_slave_configure, + .target_alloc = ibmvfc_target_alloc, + .scan_finished = ibmvfc_scan_finished, + .change_queue_depth = ibmvfc_change_queue_depth, + .cmd_per_lun = 16, + .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT, + .this_id = -1, + .sg_tablesize = SG_ALL, + .max_sectors = IBMVFC_MAX_SECTORS, + .use_clustering = ENABLE_CLUSTERING, + .shost_attrs = ibmvfc_attrs, + .track_queue_depth = 1, +}; + +/** + * ibmvfc_next_async_crq - Returns the next entry in async queue + * @vhost: ibmvfc host struct + * + * Returns: + * Pointer to next entry in queue / NULL if empty + **/ +static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost) +{ + struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq; + struct ibmvfc_async_crq *crq; + + crq = &async_crq->msgs[async_crq->cur]; + if (crq->valid & 0x80) { + if (++async_crq->cur == async_crq->size) + async_crq->cur = 0; + rmb(); + } else + crq = NULL; + + return crq; +} + +/** + * ibmvfc_next_crq - Returns the next entry in message queue + * @vhost: ibmvfc host struct + * + * Returns: + * Pointer to next entry in queue / NULL if empty + **/ +static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost) +{ + struct ibmvfc_crq_queue *queue = &vhost->crq; + struct ibmvfc_crq *crq; + + crq = &queue->msgs[queue->cur]; + if (crq->valid & 0x80) { + if (++queue->cur == queue->size) + queue->cur = 0; + rmb(); + } else + crq = NULL; + + return crq; +} + +/** + * ibmvfc_interrupt - Interrupt handler + * @irq: number of irq to handle, not used + * @dev_instance: ibmvfc_host that received interrupt + * + * Returns: + * IRQ_HANDLED + **/ +static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance) +{ + struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance; + unsigned long flags; + + spin_lock_irqsave(vhost->host->host_lock, flags); + vio_disable_interrupts(to_vio_dev(vhost->dev)); + tasklet_schedule(&vhost->tasklet); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return IRQ_HANDLED; +} + +/** + * ibmvfc_tasklet - Interrupt handler tasklet + * @data: ibmvfc host struct + * + * Returns: + * Nothing + **/ +static void ibmvfc_tasklet(void *data) +{ + struct ibmvfc_host *vhost = data; + struct vio_dev *vdev = to_vio_dev(vhost->dev); + struct ibmvfc_crq *crq; + struct ibmvfc_async_crq *async; + unsigned long flags; + int done = 0; + + spin_lock_irqsave(vhost->host->host_lock, flags); + while (!done) { + /* Pull all the valid messages off the async CRQ */ + while ((async = ibmvfc_next_async_crq(vhost)) != NULL) { + ibmvfc_handle_async(async, vhost); + async->valid = 0; + wmb(); + } + + /* Pull all the valid messages off the CRQ */ + while ((crq = ibmvfc_next_crq(vhost)) != NULL) { + ibmvfc_handle_crq(crq, vhost); + crq->valid = 0; + wmb(); + } + + vio_enable_interrupts(vdev); + if ((async = ibmvfc_next_async_crq(vhost)) != NULL) { + vio_disable_interrupts(vdev); + ibmvfc_handle_async(async, vhost); + async->valid = 0; + wmb(); + } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) { + vio_disable_interrupts(vdev); + ibmvfc_handle_crq(crq, vhost); + crq->valid = 0; + wmb(); + } else + done = 1; + } + + spin_unlock_irqrestore(vhost->host->host_lock, flags); +} + +/** + * ibmvfc_init_tgt - Set the next init job step for the target + * @tgt: ibmvfc target struct + * @job_step: job step to perform + * + **/ +static void ibmvfc_init_tgt(struct ibmvfc_target *tgt, + void (*job_step) (struct ibmvfc_target *)) +{ + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT); + tgt->job_step = job_step; + wake_up(&tgt->vhost->work_wait_q); +} + +/** + * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization + * @tgt: ibmvfc target struct + * @job_step: initialization job step + * + * Returns: 1 if step will be retried / 0 if not + * + **/ +static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt, + void (*job_step) (struct ibmvfc_target *)) +{ + if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) { + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + wake_up(&tgt->vhost->work_wait_q); + return 0; + } else + ibmvfc_init_tgt(tgt, job_step); + return 1; +} + +/* Defined in FC-LS */ +static const struct { + int code; + int retry; + int logged_in; +} prli_rsp [] = { + { 0, 1, 0 }, + { 1, 0, 1 }, + { 2, 1, 0 }, + { 3, 1, 0 }, + { 4, 0, 0 }, + { 5, 0, 0 }, + { 6, 0, 1 }, + { 7, 0, 0 }, + { 8, 1, 0 }, +}; + +/** + * ibmvfc_get_prli_rsp - Find PRLI response index + * @flags: PRLI response flags + * + **/ +static int ibmvfc_get_prli_rsp(u16 flags) +{ + int i; + int code = (flags & 0x0f00) >> 8; + + for (i = 0; i < ARRAY_SIZE(prli_rsp); i++) + if (prli_rsp[i].code == code) + return i; + + return 0; +} + +/** + * ibmvfc_tgt_prli_done - Completion handler for Process Login + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_target *tgt = evt->tgt; + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli; + struct ibmvfc_prli_svc_parms *parms = &rsp->parms; + u32 status = be16_to_cpu(rsp->common.status); + int index, level = IBMVFC_DEFAULT_LOG_LEVEL; + + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + switch (status) { + case IBMVFC_MAD_SUCCESS: + tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n", + parms->type, parms->flags, parms->service_parms); + + if (parms->type == IBMVFC_SCSI_FCP_TYPE) { + index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags)); + if (prli_rsp[index].logged_in) { + if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) { + tgt->need_login = 0; + tgt->ids.roles = 0; + if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC) + tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET; + if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC) + tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR; + tgt->add_rport = 1; + } else + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + } else if (prli_rsp[index].retry) + ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); + else + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + } else + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + break; + case IBMVFC_MAD_DRIVER_FAILED: + break; + case IBMVFC_MAD_CRQ_ERROR: + ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); + break; + case IBMVFC_MAD_FAILED: + default: + if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) && + be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED) + level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); + else if (tgt->logo_rcvd) + level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); + else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) + level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); + else + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + + tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n", + ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), + rsp->status, rsp->error, status); + break; + } + + kref_put(&tgt->kref, ibmvfc_release_tgt); + ibmvfc_free_event(evt); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_tgt_send_prli - Send a process login + * @tgt: ibmvfc target struct + * + **/ +static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt) +{ + struct ibmvfc_process_login *prli; + struct ibmvfc_host *vhost = tgt->vhost; + struct ibmvfc_event *evt; + + if (vhost->discovery_threads >= disc_threads) + return; + + kref_get(&tgt->kref); + evt = ibmvfc_get_event(vhost); + vhost->discovery_threads++; + ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT); + evt->tgt = tgt; + prli = &evt->iu.prli; + memset(prli, 0, sizeof(*prli)); + prli->common.version = cpu_to_be32(1); + prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN); + prli->common.length = cpu_to_be16(sizeof(*prli)); + prli->scsi_id = cpu_to_be64(tgt->scsi_id); + + prli->parms.type = IBMVFC_SCSI_FCP_TYPE; + prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR); + prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC); + prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED); + + if (cls3_error) + prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY); + + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); + if (ibmvfc_send_event(evt, vhost, default_timeout)) { + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + kref_put(&tgt->kref, ibmvfc_release_tgt); + } else + tgt_dbg(tgt, "Sent process login\n"); +} + +/** + * ibmvfc_tgt_plogi_done - Completion handler for Port Login + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_target *tgt = evt->tgt; + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi; + u32 status = be16_to_cpu(rsp->common.status); + int level = IBMVFC_DEFAULT_LOG_LEVEL; + + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + switch (status) { + case IBMVFC_MAD_SUCCESS: + tgt_dbg(tgt, "Port Login succeeded\n"); + if (tgt->ids.port_name && + tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) { + vhost->reinit = 1; + tgt_dbg(tgt, "Port re-init required\n"); + break; + } + tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); + tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); + tgt->ids.port_id = tgt->scsi_id; + memcpy(&tgt->service_parms, &rsp->service_parms, + sizeof(tgt->service_parms)); + memcpy(&tgt->service_parms_change, &rsp->service_parms_change, + sizeof(tgt->service_parms_change)); + ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); + break; + case IBMVFC_MAD_DRIVER_FAILED: + break; + case IBMVFC_MAD_CRQ_ERROR: + ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); + break; + case IBMVFC_MAD_FAILED: + default: + if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) + level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); + else + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + + tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", + ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error, + ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type, + ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status); + break; + } + + kref_put(&tgt->kref, ibmvfc_release_tgt); + ibmvfc_free_event(evt); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target + * @tgt: ibmvfc target struct + * + **/ +static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt) +{ + struct ibmvfc_port_login *plogi; + struct ibmvfc_host *vhost = tgt->vhost; + struct ibmvfc_event *evt; + + if (vhost->discovery_threads >= disc_threads) + return; + + kref_get(&tgt->kref); + tgt->logo_rcvd = 0; + evt = ibmvfc_get_event(vhost); + vhost->discovery_threads++; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); + ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT); + evt->tgt = tgt; + plogi = &evt->iu.plogi; + memset(plogi, 0, sizeof(*plogi)); + plogi->common.version = cpu_to_be32(1); + plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); + plogi->common.length = cpu_to_be16(sizeof(*plogi)); + plogi->scsi_id = cpu_to_be64(tgt->scsi_id); + + if (ibmvfc_send_event(evt, vhost, default_timeout)) { + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + kref_put(&tgt->kref, ibmvfc_release_tgt); + } else + tgt_dbg(tgt, "Sent port login\n"); +} + +/** + * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_target *tgt = evt->tgt; + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout; + u32 status = be16_to_cpu(rsp->common.status); + + vhost->discovery_threads--; + ibmvfc_free_event(evt); + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + + switch (status) { + case IBMVFC_MAD_SUCCESS: + tgt_dbg(tgt, "Implicit Logout succeeded\n"); + break; + case IBMVFC_MAD_DRIVER_FAILED: + kref_put(&tgt->kref, ibmvfc_release_tgt); + wake_up(&vhost->work_wait_q); + return; + case IBMVFC_MAD_FAILED: + default: + tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status); + break; + } + + if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT) + ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi); + else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS && + tgt->scsi_id != tgt->new_scsi_id) + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + kref_put(&tgt->kref, ibmvfc_release_tgt); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target + * @tgt: ibmvfc target struct + * + **/ +static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt) +{ + struct ibmvfc_implicit_logout *mad; + struct ibmvfc_host *vhost = tgt->vhost; + struct ibmvfc_event *evt; + + if (vhost->discovery_threads >= disc_threads) + return; + + kref_get(&tgt->kref); + evt = ibmvfc_get_event(vhost); + vhost->discovery_threads++; + ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT); + evt->tgt = tgt; + mad = &evt->iu.implicit_logout; + memset(mad, 0, sizeof(*mad)); + mad->common.version = cpu_to_be32(1); + mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT); + mad->common.length = cpu_to_be16(sizeof(*mad)); + mad->old_scsi_id = cpu_to_be64(tgt->scsi_id); + + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); + if (ibmvfc_send_event(evt, vhost, default_timeout)) { + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + kref_put(&tgt->kref, ibmvfc_release_tgt); + } else + tgt_dbg(tgt, "Sent Implicit Logout\n"); +} + +/** + * ibmvfc_adisc_needs_plogi - Does device need PLOGI? + * @mad: ibmvfc passthru mad struct + * @tgt: ibmvfc target struct + * + * Returns: + * 1 if PLOGI needed / 0 if PLOGI not needed + **/ +static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, + struct ibmvfc_target *tgt) +{ + if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name) + return 1; + if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name) + return 1; + if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id) + return 1; + return 0; +} + +/** + * ibmvfc_tgt_adisc_done - Completion handler for ADISC + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_target *tgt = evt->tgt; + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; + u32 status = be16_to_cpu(mad->common.status); + u8 fc_reason, fc_explain; + + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + del_timer(&tgt->timer); + + switch (status) { + case IBMVFC_MAD_SUCCESS: + tgt_dbg(tgt, "ADISC succeeded\n"); + if (ibmvfc_adisc_needs_plogi(mad, tgt)) + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + break; + case IBMVFC_MAD_DRIVER_FAILED: + break; + case IBMVFC_MAD_FAILED: + default: + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16; + fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8; + tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", + ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)), + mad->iu.status, mad->iu.error, + ibmvfc_get_fc_type(fc_reason), fc_reason, + ibmvfc_get_ls_explain(fc_explain), fc_explain, status); + break; + } + + kref_put(&tgt->kref, ibmvfc_release_tgt); + ibmvfc_free_event(evt); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_init_passthru - Initialize an event struct for FC passthru + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_init_passthru(struct ibmvfc_event *evt) +{ + struct ibmvfc_passthru_mad *mad = &evt->iu.passthru; + + memset(mad, 0, sizeof(*mad)); + mad->common.version = cpu_to_be32(1); + mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); + mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); + mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + + offsetof(struct ibmvfc_passthru_mad, iu)); + mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); + mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload)); + mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response)); + mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + + offsetof(struct ibmvfc_passthru_mad, fc_iu) + + offsetof(struct ibmvfc_passthru_fc_iu, payload)); + mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload)); + mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + + offsetof(struct ibmvfc_passthru_mad, fc_iu) + + offsetof(struct ibmvfc_passthru_fc_iu, response)); + mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response)); +} + +/** + * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC + * @evt: ibmvfc event struct + * + * Just cleanup this event struct. Everything else is handled by + * the ADISC completion handler. If the ADISC never actually comes + * back, we still have the timer running on the ADISC event struct + * which will fire and cause the CRQ to get reset. + * + **/ +static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_target *tgt = evt->tgt; + + tgt_dbg(tgt, "ADISC cancel complete\n"); + vhost->abort_threads--; + ibmvfc_free_event(evt); + kref_put(&tgt->kref, ibmvfc_release_tgt); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_adisc_timeout - Handle an ADISC timeout + * @tgt: ibmvfc target struct + * + * If an ADISC times out, send a cancel. If the cancel times + * out, reset the CRQ. When the ADISC comes back as cancelled, + * log back into the target. + **/ +static void ibmvfc_adisc_timeout(struct timer_list *t) +{ + struct ibmvfc_target *tgt = from_timer(tgt, t, timer); + struct ibmvfc_host *vhost = tgt->vhost; + struct ibmvfc_event *evt; + struct ibmvfc_tmf *tmf; + unsigned long flags; + int rc; + + tgt_dbg(tgt, "ADISC timeout\n"); + spin_lock_irqsave(vhost->host->host_lock, flags); + if (vhost->abort_threads >= disc_threads || + tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT || + vhost->state != IBMVFC_INITIALIZING || + vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) { + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return; + } + + vhost->abort_threads++; + kref_get(&tgt->kref); + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT); + + evt->tgt = tgt; + tmf = &evt->iu.tmf; + memset(tmf, 0, sizeof(*tmf)); + tmf->common.version = cpu_to_be32(1); + tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); + tmf->common.length = cpu_to_be16(sizeof(*tmf)); + tmf->scsi_id = cpu_to_be64(tgt->scsi_id); + tmf->cancel_key = cpu_to_be32(tgt->cancel_key); + + rc = ibmvfc_send_event(evt, vhost, default_timeout); + + if (rc) { + tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc); + vhost->abort_threads--; + kref_put(&tgt->kref, ibmvfc_release_tgt); + __ibmvfc_reset_host(vhost); + } else + tgt_dbg(tgt, "Attempting to cancel ADISC\n"); + spin_unlock_irqrestore(vhost->host->host_lock, flags); +} + +/** + * ibmvfc_tgt_adisc - Initiate an ADISC for specified target + * @tgt: ibmvfc target struct + * + * When sending an ADISC we end up with two timers running. The + * first timer is the timer in the ibmvfc target struct. If this + * fires, we send a cancel to the target. The second timer is the + * timer on the ibmvfc event for the ADISC, which is longer. If that + * fires, it means the ADISC timed out and our attempt to cancel it + * also failed, so we need to reset the CRQ. + **/ +static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt) +{ + struct ibmvfc_passthru_mad *mad; + struct ibmvfc_host *vhost = tgt->vhost; + struct ibmvfc_event *evt; + + if (vhost->discovery_threads >= disc_threads) + return; + + kref_get(&tgt->kref); + evt = ibmvfc_get_event(vhost); + vhost->discovery_threads++; + ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT); + evt->tgt = tgt; + + ibmvfc_init_passthru(evt); + mad = &evt->iu.passthru; + mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS); + mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id); + mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key); + + mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC); + memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name, + sizeof(vhost->login_buf->resp.port_name)); + memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name, + sizeof(vhost->login_buf->resp.node_name)); + mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff); + + if (timer_pending(&tgt->timer)) + mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ)); + else { + tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ); + add_timer(&tgt->timer); + } + + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); + if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) { + vhost->discovery_threads--; + del_timer(&tgt->timer); + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + kref_put(&tgt->kref, ibmvfc_release_tgt); + } else + tgt_dbg(tgt, "Sent ADISC\n"); +} + +/** + * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_target *tgt = evt->tgt; + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt; + u32 status = be16_to_cpu(rsp->common.status); + int level = IBMVFC_DEFAULT_LOG_LEVEL; + + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + switch (status) { + case IBMVFC_MAD_SUCCESS: + tgt_dbg(tgt, "Query Target succeeded\n"); + tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id); + if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id) + ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); + else + ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc); + break; + case IBMVFC_MAD_DRIVER_FAILED: + break; + case IBMVFC_MAD_CRQ_ERROR: + ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); + break; + case IBMVFC_MAD_FAILED: + default: + if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED && + be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ && + be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG) + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) + level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); + else + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); + + tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", + ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), + rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), + rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), + rsp->fc_explain, status); + break; + } + + kref_put(&tgt->kref, ibmvfc_release_tgt); + ibmvfc_free_event(evt); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_tgt_query_target - Initiate a Query Target for specified target + * @tgt: ibmvfc target struct + * + **/ +static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt) +{ + struct ibmvfc_query_tgt *query_tgt; + struct ibmvfc_host *vhost = tgt->vhost; + struct ibmvfc_event *evt; + + if (vhost->discovery_threads >= disc_threads) + return; + + kref_get(&tgt->kref); + evt = ibmvfc_get_event(vhost); + vhost->discovery_threads++; + evt->tgt = tgt; + ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT); + query_tgt = &evt->iu.query_tgt; + memset(query_tgt, 0, sizeof(*query_tgt)); + query_tgt->common.version = cpu_to_be32(1); + query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET); + query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt)); + query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name); + + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); + if (ibmvfc_send_event(evt, vhost, default_timeout)) { + vhost->discovery_threads--; + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); + kref_put(&tgt->kref, ibmvfc_release_tgt); + } else + tgt_dbg(tgt, "Sent Query Target\n"); +} + +/** + * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target + * @vhost: ibmvfc host struct + * @scsi_id: SCSI ID to allocate target for + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id) +{ + struct ibmvfc_target *tgt; + unsigned long flags; + + spin_lock_irqsave(vhost->host->host_lock, flags); + list_for_each_entry(tgt, &vhost->targets, queue) { + if (tgt->scsi_id == scsi_id) { + if (tgt->need_login) + ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); + goto unlock_out; + } + } + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO); + memset(tgt, 0, sizeof(*tgt)); + tgt->scsi_id = scsi_id; + tgt->new_scsi_id = scsi_id; + tgt->vhost = vhost; + tgt->need_login = 1; + tgt->cancel_key = vhost->task_set++; + timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0); + kref_init(&tgt->kref); + ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); + spin_lock_irqsave(vhost->host->host_lock, flags); + list_add_tail(&tgt->queue, &vhost->targets); + +unlock_out: + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return 0; +} + +/** + * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets + * @vhost: ibmvfc host struct + * + * Returns: + * 0 on success / other on failure + **/ +static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost) +{ + int i, rc; + + for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++) + rc = ibmvfc_alloc_target(vhost, + be32_to_cpu(vhost->disc_buf->scsi_id[i]) & + IBMVFC_DISC_TGT_SCSI_ID_MASK); + + return rc; +} + +/** + * ibmvfc_discover_targets_done - Completion handler for discover targets MAD + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets; + u32 mad_status = be16_to_cpu(rsp->common.status); + int level = IBMVFC_DEFAULT_LOG_LEVEL; + + switch (mad_status) { + case IBMVFC_MAD_SUCCESS: + ibmvfc_dbg(vhost, "Discover Targets succeeded\n"); + vhost->num_targets = be32_to_cpu(rsp->num_written); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS); + break; + case IBMVFC_MAD_FAILED: + level += ibmvfc_retry_host_init(vhost); + ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n", + ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), + rsp->status, rsp->error); + break; + case IBMVFC_MAD_DRIVER_FAILED: + break; + default: + dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status); + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + break; + } + + ibmvfc_free_event(evt); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_discover_targets - Send Discover Targets MAD + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_discover_targets(struct ibmvfc_host *vhost) +{ + struct ibmvfc_discover_targets *mad; + struct ibmvfc_event *evt = ibmvfc_get_event(vhost); + + ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT); + mad = &evt->iu.discover_targets; + memset(mad, 0, sizeof(*mad)); + mad->common.version = cpu_to_be32(1); + mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS); + mad->common.length = cpu_to_be16(sizeof(*mad)); + mad->bufflen = cpu_to_be32(vhost->disc_buf_sz); + mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma); + mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); + + if (!ibmvfc_send_event(evt, vhost, default_timeout)) + ibmvfc_dbg(vhost, "Sent discover targets\n"); + else + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); +} + +/** + * ibmvfc_npiv_login_done - Completion handler for NPIV Login + * @evt: ibmvfc event struct + * + **/ +static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status); + struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp; + unsigned int npiv_max_sectors; + int level = IBMVFC_DEFAULT_LOG_LEVEL; + + switch (mad_status) { + case IBMVFC_MAD_SUCCESS: + ibmvfc_free_event(evt); + break; + case IBMVFC_MAD_FAILED: + if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) + level += ibmvfc_retry_host_init(vhost); + else + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n", + ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), + rsp->status, rsp->error); + ibmvfc_free_event(evt); + return; + case IBMVFC_MAD_CRQ_ERROR: + ibmvfc_retry_host_init(vhost); + case IBMVFC_MAD_DRIVER_FAILED: + ibmvfc_free_event(evt); + return; + default: + dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status); + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + ibmvfc_free_event(evt); + return; + } + + vhost->client_migrated = 0; + + if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) { + dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n", + rsp->flags); + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + wake_up(&vhost->work_wait_q); + return; + } + + if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) { + dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n", + rsp->max_cmds); + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + wake_up(&vhost->work_wait_q); + return; + } + + vhost->logged_in = 1; + npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS); + dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n", + rsp->partition_name, rsp->device_name, rsp->port_loc_code, + rsp->drc_name, npiv_max_sectors); + + fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name); + fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name); + fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name); + fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id); + fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV; + fc_host_supported_classes(vhost->host) = 0; + if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000) + fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1; + if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000) + fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2; + if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000) + fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3; + fc_host_maxframe_size(vhost->host) = + be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff; + + vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ; + vhost->host->max_sectors = npiv_max_sectors; + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); + wake_up(&vhost->work_wait_q); +} + +/** + * ibmvfc_npiv_login - Sends NPIV login + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_npiv_login(struct ibmvfc_host *vhost) +{ + struct ibmvfc_npiv_login_mad *mad; + struct ibmvfc_event *evt = ibmvfc_get_event(vhost); + + ibmvfc_gather_partition_info(vhost); + ibmvfc_set_login_info(vhost); + ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT); + + memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info)); + mad = &evt->iu.npiv_login; + memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad)); + mad->common.version = cpu_to_be32(1); + mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN); + mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad)); + mad->buffer.va = cpu_to_be64(vhost->login_buf_dma); + mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf)); + + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); + + if (!ibmvfc_send_event(evt, vhost, default_timeout)) + ibmvfc_dbg(vhost, "Sent NPIV login\n"); + else + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); +}; + +/** + * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt) +{ + struct ibmvfc_host *vhost = evt->vhost; + u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status); + + ibmvfc_free_event(evt); + + switch (mad_status) { + case IBMVFC_MAD_SUCCESS: + if (list_empty(&vhost->sent) && + vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) { + ibmvfc_init_host(vhost); + return; + } + break; + case IBMVFC_MAD_FAILED: + case IBMVFC_MAD_NOT_SUPPORTED: + case IBMVFC_MAD_CRQ_ERROR: + case IBMVFC_MAD_DRIVER_FAILED: + default: + ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status); + break; + } + + ibmvfc_hard_reset_host(vhost); +} + +/** + * ibmvfc_npiv_logout - Issue an NPIV Logout + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost) +{ + struct ibmvfc_npiv_logout_mad *mad; + struct ibmvfc_event *evt; + + evt = ibmvfc_get_event(vhost); + ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT); + + mad = &evt->iu.npiv_logout; + memset(mad, 0, sizeof(*mad)); + mad->common.version = cpu_to_be32(1); + mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT); + mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad)); + + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT); + + if (!ibmvfc_send_event(evt, vhost, default_timeout)) + ibmvfc_dbg(vhost, "Sent NPIV logout\n"); + else + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); +} + +/** + * ibmvfc_dev_init_to_do - Is there target initialization work to do? + * @vhost: ibmvfc host struct + * + * Returns: + * 1 if work to do / 0 if not + **/ +static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost) +{ + struct ibmvfc_target *tgt; + + list_for_each_entry(tgt, &vhost->targets, queue) { + if (tgt->action == IBMVFC_TGT_ACTION_INIT || + tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) + return 1; + } + + return 0; +} + +/** + * __ibmvfc_work_to_do - Is there task level work to do? (no locking) + * @vhost: ibmvfc host struct + * + * Returns: + * 1 if work to do / 0 if not + **/ +static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost) +{ + struct ibmvfc_target *tgt; + + if (kthread_should_stop()) + return 1; + switch (vhost->action) { + case IBMVFC_HOST_ACTION_NONE: + case IBMVFC_HOST_ACTION_INIT_WAIT: + case IBMVFC_HOST_ACTION_LOGO_WAIT: + return 0; + case IBMVFC_HOST_ACTION_TGT_INIT: + case IBMVFC_HOST_ACTION_QUERY_TGTS: + if (vhost->discovery_threads == disc_threads) + return 0; + list_for_each_entry(tgt, &vhost->targets, queue) + if (tgt->action == IBMVFC_TGT_ACTION_INIT) + return 1; + list_for_each_entry(tgt, &vhost->targets, queue) + if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) + return 0; + return 1; + case IBMVFC_HOST_ACTION_LOGO: + case IBMVFC_HOST_ACTION_INIT: + case IBMVFC_HOST_ACTION_ALLOC_TGTS: + case IBMVFC_HOST_ACTION_TGT_DEL: + case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: + case IBMVFC_HOST_ACTION_QUERY: + case IBMVFC_HOST_ACTION_RESET: + case IBMVFC_HOST_ACTION_REENABLE: + default: + break; + } + + return 1; +} + +/** + * ibmvfc_work_to_do - Is there task level work to do? + * @vhost: ibmvfc host struct + * + * Returns: + * 1 if work to do / 0 if not + **/ +static int ibmvfc_work_to_do(struct ibmvfc_host *vhost) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(vhost->host->host_lock, flags); + rc = __ibmvfc_work_to_do(vhost); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return rc; +} + +/** + * ibmvfc_log_ae - Log async events if necessary + * @vhost: ibmvfc host struct + * @events: events to log + * + **/ +static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events) +{ + if (events & IBMVFC_AE_RSCN) + fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0); + if ((events & IBMVFC_AE_LINKDOWN) && + vhost->state >= IBMVFC_HALTED) + fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0); + if ((events & IBMVFC_AE_LINKUP) && + vhost->state == IBMVFC_INITIALIZING) + fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0); +} + +/** + * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port + * @tgt: ibmvfc target struct + * + **/ +static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt) +{ + struct ibmvfc_host *vhost = tgt->vhost; + struct fc_rport *rport; + unsigned long flags; + + tgt_dbg(tgt, "Adding rport\n"); + rport = fc_remote_port_add(vhost->host, 0, &tgt->ids); + spin_lock_irqsave(vhost->host->host_lock, flags); + + if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { + tgt_dbg(tgt, "Deleting rport\n"); + list_del(&tgt->queue); + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + fc_remote_port_delete(rport); + del_timer_sync(&tgt->timer); + kref_put(&tgt->kref, ibmvfc_release_tgt); + return; + } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) { + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return; + } + + if (rport) { + tgt_dbg(tgt, "rport add succeeded\n"); + tgt->rport = rport; + rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff; + rport->supported_classes = 0; + tgt->target_id = rport->scsi_target_id; + if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000) + rport->supported_classes |= FC_COS_CLASS1; + if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000) + rport->supported_classes |= FC_COS_CLASS2; + if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000) + rport->supported_classes |= FC_COS_CLASS3; + if (rport->rqst_q) + blk_queue_max_segments(rport->rqst_q, 1); + } else + tgt_dbg(tgt, "rport add failed\n"); + spin_unlock_irqrestore(vhost->host->host_lock, flags); +} + +/** + * ibmvfc_do_work - Do task level work + * @vhost: ibmvfc host struct + * + **/ +static void ibmvfc_do_work(struct ibmvfc_host *vhost) +{ + struct ibmvfc_target *tgt; + unsigned long flags; + struct fc_rport *rport; + int rc; + + ibmvfc_log_ae(vhost, vhost->events_to_log); + spin_lock_irqsave(vhost->host->host_lock, flags); + vhost->events_to_log = 0; + switch (vhost->action) { + case IBMVFC_HOST_ACTION_NONE: + case IBMVFC_HOST_ACTION_LOGO_WAIT: + case IBMVFC_HOST_ACTION_INIT_WAIT: + break; + case IBMVFC_HOST_ACTION_RESET: + spin_unlock_irqrestore(vhost->host->host_lock, flags); + rc = ibmvfc_reset_crq(vhost); + + spin_lock_irqsave(vhost->host->host_lock, flags); + if (!rc || rc == H_CLOSED) + vio_enable_interrupts(to_vio_dev(vhost->dev)); + if (vhost->action == IBMVFC_HOST_ACTION_RESET) { + /* + * The only action we could have changed to would have + * been reenable, in which case, we skip the rest of + * this path and wait until we've done the re-enable + * before sending the crq init. + */ + vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; + + if (rc || (rc = ibmvfc_send_crq_init(vhost)) || + (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) { + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc); + } + } + break; + case IBMVFC_HOST_ACTION_REENABLE: + spin_unlock_irqrestore(vhost->host->host_lock, flags); + rc = ibmvfc_reenable_crq_queue(vhost); + + spin_lock_irqsave(vhost->host->host_lock, flags); + if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) { + /* + * The only action we could have changed to would have + * been reset, in which case, we skip the rest of this + * path and wait until we've done the reset before + * sending the crq init. + */ + vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; + if (rc || (rc = ibmvfc_send_crq_init(vhost))) { + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); + dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc); + } + } + break; + case IBMVFC_HOST_ACTION_LOGO: + vhost->job_step(vhost); + break; + case IBMVFC_HOST_ACTION_INIT: + BUG_ON(vhost->state != IBMVFC_INITIALIZING); + if (vhost->delay_init) { + vhost->delay_init = 0; + spin_unlock_irqrestore(vhost->host->host_lock, flags); + ssleep(15); + return; + } else + vhost->job_step(vhost); + break; + case IBMVFC_HOST_ACTION_QUERY: + list_for_each_entry(tgt, &vhost->targets, queue) + ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS); + break; + case IBMVFC_HOST_ACTION_QUERY_TGTS: + list_for_each_entry(tgt, &vhost->targets, queue) { + if (tgt->action == IBMVFC_TGT_ACTION_INIT) { + tgt->job_step(tgt); + break; + } + } + + if (!ibmvfc_dev_init_to_do(vhost)) + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); + break; + case IBMVFC_HOST_ACTION_TGT_DEL: + case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: + list_for_each_entry(tgt, &vhost->targets, queue) { + if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { + tgt_dbg(tgt, "Deleting rport\n"); + rport = tgt->rport; + tgt->rport = NULL; + list_del(&tgt->queue); + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + if (rport) + fc_remote_port_delete(rport); + del_timer_sync(&tgt->timer); + kref_put(&tgt->kref, ibmvfc_release_tgt); + return; + } + } + + if (vhost->state == IBMVFC_INITIALIZING) { + if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) { + if (vhost->reinit) { + vhost->reinit = 0; + scsi_block_requests(vhost->host); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + } else { + ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE); + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); + wake_up(&vhost->init_wait_q); + schedule_work(&vhost->rport_add_work_q); + vhost->init_retries = 0; + spin_unlock_irqrestore(vhost->host->host_lock, flags); + scsi_unblock_requests(vhost->host); + } + + return; + } else { + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); + vhost->job_step = ibmvfc_discover_targets; + } + } else { + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + scsi_unblock_requests(vhost->host); + wake_up(&vhost->init_wait_q); + return; + } + break; + case IBMVFC_HOST_ACTION_ALLOC_TGTS: + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + ibmvfc_alloc_targets(vhost); + spin_lock_irqsave(vhost->host->host_lock, flags); + break; + case IBMVFC_HOST_ACTION_TGT_INIT: + list_for_each_entry(tgt, &vhost->targets, queue) { + if (tgt->action == IBMVFC_TGT_ACTION_INIT) { + tgt->job_step(tgt); + break; + } + } + + if (!ibmvfc_dev_init_to_do(vhost)) + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED); + break; + default: + break; + } + + spin_unlock_irqrestore(vhost->host->host_lock, flags); +} + +/** + * ibmvfc_work - Do task level work + * @data: ibmvfc host struct + * + * Returns: + * zero + **/ +static int ibmvfc_work(void *data) +{ + struct ibmvfc_host *vhost = data; + int rc; + + set_user_nice(current, MIN_NICE); + + while (1) { + rc = wait_event_interruptible(vhost->work_wait_q, + ibmvfc_work_to_do(vhost)); + + BUG_ON(rc); + + if (kthread_should_stop()) + break; + + ibmvfc_do_work(vhost); + } + + ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n"); + return 0; +} + +/** + * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor + * @vhost: ibmvfc host struct + * + * Allocates a page for messages, maps it for dma, and registers + * the crq with the hypervisor. + * + * Return value: + * zero on success / other on failure + **/ +static int ibmvfc_init_crq(struct ibmvfc_host *vhost) +{ + int rc, retrc = -ENOMEM; + struct device *dev = vhost->dev; + struct vio_dev *vdev = to_vio_dev(dev); + struct ibmvfc_crq_queue *crq = &vhost->crq; + + ENTER; + crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL); + + if (!crq->msgs) + return -ENOMEM; + + crq->size = PAGE_SIZE / sizeof(*crq->msgs); + crq->msg_token = dma_map_single(dev, crq->msgs, + PAGE_SIZE, DMA_BIDIRECTIONAL); + + if (dma_mapping_error(dev, crq->msg_token)) + goto map_failed; + + retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, + crq->msg_token, PAGE_SIZE); + + if (rc == H_RESOURCE) + /* maybe kexecing and resource is busy. try a reset */ + retrc = rc = ibmvfc_reset_crq(vhost); + + if (rc == H_CLOSED) + dev_warn(dev, "Partner adapter not ready\n"); + else if (rc) { + dev_warn(dev, "Error %d opening adapter\n", rc); + goto reg_crq_failed; + } + + retrc = 0; + + tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost); + + if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) { + dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc); + goto req_irq_failed; + } + + if ((rc = vio_enable_interrupts(vdev))) { + dev_err(dev, "Error %d enabling interrupts\n", rc); + goto req_irq_failed; + } + + crq->cur = 0; + LEAVE; + return retrc; + +req_irq_failed: + tasklet_kill(&vhost->tasklet); + do { + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); +reg_crq_failed: + dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); +map_failed: + free_page((unsigned long)crq->msgs); + return retrc; +} + +/** + * ibmvfc_free_mem - Free memory for vhost + * @vhost: ibmvfc host struct + * + * Return value: + * none + **/ +static void ibmvfc_free_mem(struct ibmvfc_host *vhost) +{ + struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq; + + ENTER; + mempool_destroy(vhost->tgt_pool); + kfree(vhost->trace); + dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf, + vhost->disc_buf_dma); + dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf), + vhost->login_buf, vhost->login_buf_dma); + dma_pool_destroy(vhost->sg_pool); + dma_unmap_single(vhost->dev, async_q->msg_token, + async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL); + free_page((unsigned long)async_q->msgs); + LEAVE; +} + +/** + * ibmvfc_alloc_mem - Allocate memory for vhost + * @vhost: ibmvfc host struct + * + * Return value: + * 0 on success / non-zero on failure + **/ +static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost) +{ + struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq; + struct device *dev = vhost->dev; + + ENTER; + async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL); + if (!async_q->msgs) { + dev_err(dev, "Couldn't allocate async queue.\n"); + goto nomem; + } + + async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq); + async_q->msg_token = dma_map_single(dev, async_q->msgs, + async_q->size * sizeof(*async_q->msgs), + DMA_BIDIRECTIONAL); + + if (dma_mapping_error(dev, async_q->msg_token)) { + dev_err(dev, "Failed to map async queue\n"); + goto free_async_crq; + } + + vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev, + SG_ALL * sizeof(struct srp_direct_buf), + sizeof(struct srp_direct_buf), 0); + + if (!vhost->sg_pool) { + dev_err(dev, "Failed to allocate sg pool\n"); + goto unmap_async_crq; + } + + vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf), + &vhost->login_buf_dma, GFP_KERNEL); + + if (!vhost->login_buf) { + dev_err(dev, "Couldn't allocate NPIV login buffer\n"); + goto free_sg_pool; + } + + vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets; + vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz, + &vhost->disc_buf_dma, GFP_KERNEL); + + if (!vhost->disc_buf) { + dev_err(dev, "Couldn't allocate Discover Targets buffer\n"); + goto free_login_buffer; + } + + vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES, + sizeof(struct ibmvfc_trace_entry), GFP_KERNEL); + + if (!vhost->trace) + goto free_disc_buffer; + + vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ, + sizeof(struct ibmvfc_target)); + + if (!vhost->tgt_pool) { + dev_err(dev, "Couldn't allocate target memory pool\n"); + goto free_trace; + } + + LEAVE; + return 0; + +free_trace: + kfree(vhost->trace); +free_disc_buffer: + dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf, + vhost->disc_buf_dma); +free_login_buffer: + dma_free_coherent(dev, sizeof(*vhost->login_buf), + vhost->login_buf, vhost->login_buf_dma); +free_sg_pool: + dma_pool_destroy(vhost->sg_pool); +unmap_async_crq: + dma_unmap_single(dev, async_q->msg_token, + async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL); +free_async_crq: + free_page((unsigned long)async_q->msgs); +nomem: + LEAVE; + return -ENOMEM; +} + +/** + * ibmvfc_rport_add_thread - Worker thread for rport adds + * @work: work struct + * + **/ +static void ibmvfc_rport_add_thread(struct work_struct *work) +{ + struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host, + rport_add_work_q); + struct ibmvfc_target *tgt; + struct fc_rport *rport; + unsigned long flags; + int did_work; + + ENTER; + spin_lock_irqsave(vhost->host->host_lock, flags); + do { + did_work = 0; + if (vhost->state != IBMVFC_ACTIVE) + break; + + list_for_each_entry(tgt, &vhost->targets, queue) { + if (tgt->add_rport) { + did_work = 1; + tgt->add_rport = 0; + kref_get(&tgt->kref); + rport = tgt->rport; + if (!rport) { + spin_unlock_irqrestore(vhost->host->host_lock, flags); + ibmvfc_tgt_add_rport(tgt); + } else if (get_device(&rport->dev)) { + spin_unlock_irqrestore(vhost->host->host_lock, flags); + tgt_dbg(tgt, "Setting rport roles\n"); + fc_remote_port_rolechg(rport, tgt->ids.roles); + put_device(&rport->dev); + } else { + spin_unlock_irqrestore(vhost->host->host_lock, flags); + } + + kref_put(&tgt->kref, ibmvfc_release_tgt); + spin_lock_irqsave(vhost->host->host_lock, flags); + break; + } + } + } while(did_work); + + if (vhost->state == IBMVFC_ACTIVE) + vhost->scan_complete = 1; + spin_unlock_irqrestore(vhost->host->host_lock, flags); + LEAVE; +} + +/** + * ibmvfc_probe - Adapter hot plug add entry point + * @vdev: vio device struct + * @id: vio device id struct + * + * Return value: + * 0 on success / non-zero on failure + **/ +static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id) +{ + struct ibmvfc_host *vhost; + struct Scsi_Host *shost; + struct device *dev = &vdev->dev; + int rc = -ENOMEM; + + ENTER; + shost = scsi_host_alloc(&driver_template, sizeof(*vhost)); + if (!shost) { + dev_err(dev, "Couldn't allocate host data\n"); + goto out; + } + + shost->transportt = ibmvfc_transport_template; + shost->can_queue = max_requests; + shost->max_lun = max_lun; + shost->max_id = max_targets; + shost->max_sectors = IBMVFC_MAX_SECTORS; + shost->max_cmd_len = IBMVFC_MAX_CDB_LEN; + shost->unique_id = shost->host_no; + + vhost = shost_priv(shost); + INIT_LIST_HEAD(&vhost->sent); + INIT_LIST_HEAD(&vhost->free); + INIT_LIST_HEAD(&vhost->targets); + sprintf(vhost->name, IBMVFC_NAME); + vhost->host = shost; + vhost->dev = dev; + vhost->partition_number = -1; + vhost->log_level = log_level; + vhost->task_set = 1; + strcpy(vhost->partition_name, "UNKNOWN"); + init_waitqueue_head(&vhost->work_wait_q); + init_waitqueue_head(&vhost->init_wait_q); + INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread); + mutex_init(&vhost->passthru_mutex); + + if ((rc = ibmvfc_alloc_mem(vhost))) + goto free_scsi_host; + + vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME, + shost->host_no); + + if (IS_ERR(vhost->work_thread)) { + dev_err(dev, "Couldn't create kernel thread: %ld\n", + PTR_ERR(vhost->work_thread)); + rc = PTR_ERR(vhost->work_thread); + goto free_host_mem; + } + + if ((rc = ibmvfc_init_crq(vhost))) { + dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc); + goto kill_kthread; + } + + if ((rc = ibmvfc_init_event_pool(vhost))) { + dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc); + goto release_crq; + } + + if ((rc = scsi_add_host(shost, dev))) + goto release_event_pool; + + fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO; + + if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj, + &ibmvfc_trace_attr))) { + dev_err(dev, "Failed to create trace file. rc=%d\n", rc); + goto remove_shost; + } + + if (shost_to_fc_host(shost)->rqst_q) + blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1); + dev_set_drvdata(dev, vhost); + spin_lock(&ibmvfc_driver_lock); + list_add_tail(&vhost->queue, &ibmvfc_head); + spin_unlock(&ibmvfc_driver_lock); + + ibmvfc_send_crq_init(vhost); + scsi_scan_host(shost); + return 0; + +remove_shost: + scsi_remove_host(shost); +release_event_pool: + ibmvfc_free_event_pool(vhost); +release_crq: + ibmvfc_release_crq_queue(vhost); +kill_kthread: + kthread_stop(vhost->work_thread); +free_host_mem: + ibmvfc_free_mem(vhost); +free_scsi_host: + scsi_host_put(shost); +out: + LEAVE; + return rc; +} + +/** + * ibmvfc_remove - Adapter hot plug remove entry point + * @vdev: vio device struct + * + * Return value: + * 0 + **/ +static int ibmvfc_remove(struct vio_dev *vdev) +{ + struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev); + unsigned long flags; + + ENTER; + ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr); + + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + + ibmvfc_wait_while_resetting(vhost); + ibmvfc_release_crq_queue(vhost); + kthread_stop(vhost->work_thread); + fc_remove_host(vhost->host); + scsi_remove_host(vhost->host); + + spin_lock_irqsave(vhost->host->host_lock, flags); + ibmvfc_purge_requests(vhost, DID_ERROR); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + ibmvfc_free_event_pool(vhost); + + ibmvfc_free_mem(vhost); + spin_lock(&ibmvfc_driver_lock); + list_del(&vhost->queue); + spin_unlock(&ibmvfc_driver_lock); + scsi_host_put(vhost->host); + LEAVE; + return 0; +} + +/** + * ibmvfc_resume - Resume from suspend + * @dev: device struct + * + * We may have lost an interrupt across suspend/resume, so kick the + * interrupt handler + * + */ +static int ibmvfc_resume(struct device *dev) +{ + unsigned long flags; + struct ibmvfc_host *vhost = dev_get_drvdata(dev); + struct vio_dev *vdev = to_vio_dev(dev); + + spin_lock_irqsave(vhost->host->host_lock, flags); + vio_disable_interrupts(vdev); + tasklet_schedule(&vhost->tasklet); + spin_unlock_irqrestore(vhost->host->host_lock, flags); + return 0; +} + +/** + * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver + * @vdev: vio device struct + * + * Return value: + * Number of bytes the driver will need to DMA map at the same time in + * order to perform well. + */ +static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev) +{ + unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu); + return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun); +} + +static const struct vio_device_id ibmvfc_device_table[] = { + {"fcp", "IBM,vfc-client"}, + { "", "" } +}; +MODULE_DEVICE_TABLE(vio, ibmvfc_device_table); + +static const struct dev_pm_ops ibmvfc_pm_ops = { + .resume = ibmvfc_resume +}; + +static struct vio_driver ibmvfc_driver = { + .id_table = ibmvfc_device_table, + .probe = ibmvfc_probe, + .remove = ibmvfc_remove, + .get_desired_dma = ibmvfc_get_desired_dma, + .name = IBMVFC_NAME, + .pm = &ibmvfc_pm_ops, +}; + +static struct fc_function_template ibmvfc_transport_functions = { + .show_host_fabric_name = 1, + .show_host_node_name = 1, + .show_host_port_name = 1, + .show_host_supported_classes = 1, + .show_host_port_type = 1, + .show_host_port_id = 1, + .show_host_maxframe_size = 1, + + .get_host_port_state = ibmvfc_get_host_port_state, + .show_host_port_state = 1, + + .get_host_speed = ibmvfc_get_host_speed, + .show_host_speed = 1, + + .issue_fc_host_lip = ibmvfc_issue_fc_host_lip, + .terminate_rport_io = ibmvfc_terminate_rport_io, + + .show_rport_maxframe_size = 1, + .show_rport_supported_classes = 1, + + .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo, + .show_rport_dev_loss_tmo = 1, + + .get_starget_node_name = ibmvfc_get_starget_node_name, + .show_starget_node_name = 1, + + .get_starget_port_name = ibmvfc_get_starget_port_name, + .show_starget_port_name = 1, + + .get_starget_port_id = ibmvfc_get_starget_port_id, + .show_starget_port_id = 1, + + .bsg_request = ibmvfc_bsg_request, + .bsg_timeout = ibmvfc_bsg_timeout, +}; + +/** + * ibmvfc_module_init - Initialize the ibmvfc module + * + * Return value: + * 0 on success / other on failure + **/ +static int __init ibmvfc_module_init(void) +{ + int rc; + + if (!firmware_has_feature(FW_FEATURE_VIO)) + return -ENODEV; + + printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n", + IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE); + + ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions); + if (!ibmvfc_transport_template) + return -ENOMEM; + + rc = vio_register_driver(&ibmvfc_driver); + if (rc) + fc_release_transport(ibmvfc_transport_template); + return rc; +} + +/** + * ibmvfc_module_exit - Teardown the ibmvfc module + * + * Return value: + * nothing + **/ +static void __exit ibmvfc_module_exit(void) +{ + vio_unregister_driver(&ibmvfc_driver); + fc_release_transport(ibmvfc_transport_template); +} + +module_init(ibmvfc_module_init); +module_exit(ibmvfc_module_exit); diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h new file mode 100644 index 000000000..b81a53c4a --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvfc.h @@ -0,0 +1,776 @@ +/* + * ibmvfc.h -- driver for IBM Power Virtual Fibre Channel Adapter + * + * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation + * + * Copyright (C) IBM Corporation, 2008 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#ifndef _IBMVFC_H +#define _IBMVFC_H + +#include <linux/list.h> +#include <linux/types.h> +#include <scsi/viosrp.h> + +#define IBMVFC_NAME "ibmvfc" +#define IBMVFC_DRIVER_VERSION "1.0.11" +#define IBMVFC_DRIVER_DATE "(April 12, 2013)" + +#define IBMVFC_DEFAULT_TIMEOUT 60 +#define IBMVFC_ADISC_CANCEL_TIMEOUT 45 +#define IBMVFC_ADISC_TIMEOUT 15 +#define IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT \ + (IBMVFC_ADISC_TIMEOUT + IBMVFC_ADISC_CANCEL_TIMEOUT) +#define IBMVFC_INIT_TIMEOUT 120 +#define IBMVFC_ABORT_TIMEOUT 8 +#define IBMVFC_ABORT_WAIT_TIMEOUT 40 +#define IBMVFC_MAX_REQUESTS_DEFAULT 100 + +#define IBMVFC_DEBUG 0 +#define IBMVFC_MAX_TARGETS 1024 +#define IBMVFC_MAX_LUN 0xffffffff +#define IBMVFC_MAX_SECTORS 0xffffu +#define IBMVFC_MAX_DISC_THREADS 4 +#define IBMVFC_TGT_MEMPOOL_SZ 64 +#define IBMVFC_MAX_CMDS_PER_LUN 64 +#define IBMVFC_MAX_HOST_INIT_RETRIES 6 +#define IBMVFC_MAX_TGT_INIT_RETRIES 3 +#define IBMVFC_DEV_LOSS_TMO (5 * 60) +#define IBMVFC_DEFAULT_LOG_LEVEL 2 +#define IBMVFC_MAX_CDB_LEN 16 +#define IBMVFC_CLS3_ERROR 0 + +/* + * Ensure we have resources for ERP and initialization: + * 1 for ERP + * 1 for initialization + * 1 for NPIV Logout + * 2 for BSG passthru + * 2 for each discovery thread + */ +#define IBMVFC_NUM_INTERNAL_REQ (1 + 1 + 1 + 2 + (disc_threads * 2)) + +#define IBMVFC_MAD_SUCCESS 0x00 +#define IBMVFC_MAD_NOT_SUPPORTED 0xF1 +#define IBMVFC_MAD_FAILED 0xF7 +#define IBMVFC_MAD_DRIVER_FAILED 0xEE +#define IBMVFC_MAD_CRQ_ERROR 0xEF + +enum ibmvfc_crq_valid { + IBMVFC_CRQ_CMD_RSP = 0x80, + IBMVFC_CRQ_INIT_RSP = 0xC0, + IBMVFC_CRQ_XPORT_EVENT = 0xFF, +}; + +enum ibmvfc_crq_format { + IBMVFC_CRQ_INIT = 0x01, + IBMVFC_CRQ_INIT_COMPLETE = 0x02, + IBMVFC_PARTITION_MIGRATED = 0x06, +}; + +enum ibmvfc_cmd_status_flags { + IBMVFC_FABRIC_MAPPED = 0x0001, + IBMVFC_VIOS_FAILURE = 0x0002, + IBMVFC_FC_FAILURE = 0x0004, + IBMVFC_FC_SCSI_ERROR = 0x0008, + IBMVFC_HW_EVENT_LOGGED = 0x0010, + IBMVFC_VIOS_LOGGED = 0x0020, +}; + +enum ibmvfc_fabric_mapped_errors { + IBMVFC_UNABLE_TO_ESTABLISH = 0x0001, + IBMVFC_XPORT_FAULT = 0x0002, + IBMVFC_CMD_TIMEOUT = 0x0003, + IBMVFC_ENETDOWN = 0x0004, + IBMVFC_HW_FAILURE = 0x0005, + IBMVFC_LINK_DOWN_ERR = 0x0006, + IBMVFC_LINK_DEAD_ERR = 0x0007, + IBMVFC_UNABLE_TO_REGISTER = 0x0008, + IBMVFC_XPORT_BUSY = 0x000A, + IBMVFC_XPORT_DEAD = 0x000B, + IBMVFC_CONFIG_ERROR = 0x000C, + IBMVFC_NAME_SERVER_FAIL = 0x000D, + IBMVFC_LINK_HALTED = 0x000E, + IBMVFC_XPORT_GENERAL = 0x8000, +}; + +enum ibmvfc_vios_errors { + IBMVFC_CRQ_FAILURE = 0x0001, + IBMVFC_SW_FAILURE = 0x0002, + IBMVFC_INVALID_PARAMETER = 0x0003, + IBMVFC_MISSING_PARAMETER = 0x0004, + IBMVFC_HOST_IO_BUS = 0x0005, + IBMVFC_TRANS_CANCELLED = 0x0006, + IBMVFC_TRANS_CANCELLED_IMPLICIT = 0x0007, + IBMVFC_INSUFFICIENT_RESOURCE = 0x0008, + IBMVFC_PLOGI_REQUIRED = 0x0010, + IBMVFC_COMMAND_FAILED = 0x8000, +}; + +enum ibmvfc_mad_types { + IBMVFC_NPIV_LOGIN = 0x0001, + IBMVFC_DISC_TARGETS = 0x0002, + IBMVFC_PORT_LOGIN = 0x0004, + IBMVFC_PROCESS_LOGIN = 0x0008, + IBMVFC_QUERY_TARGET = 0x0010, + IBMVFC_IMPLICIT_LOGOUT = 0x0040, + IBMVFC_PASSTHRU = 0x0200, + IBMVFC_TMF_MAD = 0x0100, + IBMVFC_NPIV_LOGOUT = 0x0800, +}; + +struct ibmvfc_mad_common { + __be32 version; + __be32 reserved; + __be32 opcode; + __be16 status; + __be16 length; + __be64 tag; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_npiv_login_mad { + struct ibmvfc_mad_common common; + struct srp_direct_buf buffer; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_npiv_logout_mad { + struct ibmvfc_mad_common common; +}__attribute__((packed, aligned (8))); + +#define IBMVFC_MAX_NAME 256 + +struct ibmvfc_npiv_login { + __be32 ostype; +#define IBMVFC_OS_LINUX 0x02 + __be32 pad; + __be64 max_dma_len; + __be32 max_payload; + __be32 max_response; + __be32 partition_num; + __be32 vfc_frame_version; + __be16 fcp_version; + __be16 flags; +#define IBMVFC_CLIENT_MIGRATED 0x01 +#define IBMVFC_FLUSH_ON_HALT 0x02 + __be32 max_cmds; + __be64 capabilities; +#define IBMVFC_CAN_MIGRATE 0x01 + __be64 node_name; + struct srp_direct_buf async; + u8 partition_name[IBMVFC_MAX_NAME]; + u8 device_name[IBMVFC_MAX_NAME]; + u8 drc_name[IBMVFC_MAX_NAME]; + __be64 reserved2[2]; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_common_svc_parms { + __be16 fcph_version; + __be16 b2b_credit; + __be16 features; + __be16 bb_rcv_sz; /* upper nibble is BB_SC_N */ + __be32 ratov; + __be32 edtov; +}__attribute__((packed, aligned (4))); + +struct ibmvfc_service_parms { + struct ibmvfc_common_svc_parms common; + u8 port_name[8]; + u8 node_name[8]; + __be32 class1_parms[4]; + __be32 class2_parms[4]; + __be32 class3_parms[4]; + __be32 obsolete[4]; + __be32 vendor_version[4]; + __be32 services_avail[2]; + __be32 ext_len; + __be32 reserved[30]; + __be32 clk_sync_qos[2]; +}__attribute__((packed, aligned (4))); + +struct ibmvfc_npiv_login_resp { + __be32 version; + __be16 status; + __be16 error; + __be32 flags; +#define IBMVFC_NATIVE_FC 0x01 + __be32 reserved; + __be64 capabilities; +#define IBMVFC_CAN_FLUSH_ON_HALT 0x08 +#define IBMVFC_CAN_SUPPRESS_ABTS 0x10 + __be32 max_cmds; + __be32 scsi_id_sz; + __be64 max_dma_len; + __be64 scsi_id; + __be64 port_name; + __be64 node_name; + __be64 link_speed; + u8 partition_name[IBMVFC_MAX_NAME]; + u8 device_name[IBMVFC_MAX_NAME]; + u8 port_loc_code[IBMVFC_MAX_NAME]; + u8 drc_name[IBMVFC_MAX_NAME]; + struct ibmvfc_service_parms service_parms; + __be64 reserved2; +}__attribute__((packed, aligned (8))); + +union ibmvfc_npiv_login_data { + struct ibmvfc_npiv_login login; + struct ibmvfc_npiv_login_resp resp; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_discover_targets_buf { + __be32 scsi_id[1]; +#define IBMVFC_DISC_TGT_SCSI_ID_MASK 0x00ffffff +}; + +struct ibmvfc_discover_targets { + struct ibmvfc_mad_common common; + struct srp_direct_buf buffer; + __be32 flags; + __be16 status; + __be16 error; + __be32 bufflen; + __be32 num_avail; + __be32 num_written; + __be64 reserved[2]; +}__attribute__((packed, aligned (8))); + +enum ibmvfc_fc_reason { + IBMVFC_INVALID_ELS_CMD_CODE = 0x01, + IBMVFC_INVALID_VERSION = 0x02, + IBMVFC_LOGICAL_ERROR = 0x03, + IBMVFC_INVALID_CT_IU_SIZE = 0x04, + IBMVFC_LOGICAL_BUSY = 0x05, + IBMVFC_PROTOCOL_ERROR = 0x07, + IBMVFC_UNABLE_TO_PERFORM_REQ = 0x09, + IBMVFC_CMD_NOT_SUPPORTED = 0x0B, + IBMVFC_SERVER_NOT_AVAIL = 0x0D, + IBMVFC_CMD_IN_PROGRESS = 0x0E, + IBMVFC_VENDOR_SPECIFIC = 0xFF, +}; + +enum ibmvfc_fc_type { + IBMVFC_FABRIC_REJECT = 0x01, + IBMVFC_PORT_REJECT = 0x02, + IBMVFC_LS_REJECT = 0x03, + IBMVFC_FABRIC_BUSY = 0x04, + IBMVFC_PORT_BUSY = 0x05, + IBMVFC_BASIC_REJECT = 0x06, +}; + +enum ibmvfc_gs_explain { + IBMVFC_PORT_NAME_NOT_REG = 0x02, +}; + +struct ibmvfc_port_login { + struct ibmvfc_mad_common common; + __be64 scsi_id; + __be16 reserved; + __be16 fc_service_class; + __be32 blksz; + __be32 hdr_per_blk; + __be16 status; + __be16 error; /* also fc_reason */ + __be16 fc_explain; + __be16 fc_type; + __be32 reserved2; + struct ibmvfc_service_parms service_parms; + struct ibmvfc_service_parms service_parms_change; + __be64 reserved3[2]; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_prli_svc_parms { + u8 type; +#define IBMVFC_SCSI_FCP_TYPE 0x08 + u8 type_ext; + __be16 flags; +#define IBMVFC_PRLI_ORIG_PA_VALID 0x8000 +#define IBMVFC_PRLI_RESP_PA_VALID 0x4000 +#define IBMVFC_PRLI_EST_IMG_PAIR 0x2000 + __be32 orig_pa; + __be32 resp_pa; + __be32 service_parms; +#define IBMVFC_PRLI_TASK_RETRY 0x00000200 +#define IBMVFC_PRLI_RETRY 0x00000100 +#define IBMVFC_PRLI_DATA_OVERLAY 0x00000040 +#define IBMVFC_PRLI_INITIATOR_FUNC 0x00000020 +#define IBMVFC_PRLI_TARGET_FUNC 0x00000010 +#define IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED 0x00000002 +#define IBMVFC_PRLI_WR_FCP_XFER_RDY_DISABLED 0x00000001 +}__attribute__((packed, aligned (4))); + +struct ibmvfc_process_login { + struct ibmvfc_mad_common common; + __be64 scsi_id; + struct ibmvfc_prli_svc_parms parms; + u8 reserved[48]; + __be16 status; + __be16 error; /* also fc_reason */ + __be32 reserved2; + __be64 reserved3[2]; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_query_tgt { + struct ibmvfc_mad_common common; + __be64 wwpn; + __be64 scsi_id; + __be16 status; + __be16 error; + __be16 fc_explain; + __be16 fc_type; + __be64 reserved[2]; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_implicit_logout { + struct ibmvfc_mad_common common; + __be64 old_scsi_id; + __be64 reserved[2]; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_tmf { + struct ibmvfc_mad_common common; + __be64 scsi_id; + struct scsi_lun lun; + __be32 flags; +#define IBMVFC_TMF_ABORT_TASK 0x02 +#define IBMVFC_TMF_ABORT_TASK_SET 0x04 +#define IBMVFC_TMF_LUN_RESET 0x10 +#define IBMVFC_TMF_TGT_RESET 0x20 +#define IBMVFC_TMF_LUA_VALID 0x40 +#define IBMVFC_TMF_SUPPRESS_ABTS 0x80 + __be32 cancel_key; + __be32 my_cancel_key; + __be32 pad; + __be64 reserved[2]; +}__attribute__((packed, aligned (8))); + +enum ibmvfc_fcp_rsp_info_codes { + RSP_NO_FAILURE = 0x00, + RSP_TMF_REJECTED = 0x04, + RSP_TMF_FAILED = 0x05, + RSP_TMF_INVALID_LUN = 0x09, +}; + +struct ibmvfc_fcp_rsp_info { + u8 reserved[3]; + u8 rsp_code; + u8 reserved2[4]; +}__attribute__((packed, aligned (2))); + +enum ibmvfc_fcp_rsp_flags { + FCP_BIDI_RSP = 0x80, + FCP_BIDI_READ_RESID_UNDER = 0x40, + FCP_BIDI_READ_RESID_OVER = 0x20, + FCP_CONF_REQ = 0x10, + FCP_RESID_UNDER = 0x08, + FCP_RESID_OVER = 0x04, + FCP_SNS_LEN_VALID = 0x02, + FCP_RSP_LEN_VALID = 0x01, +}; + +union ibmvfc_fcp_rsp_data { + struct ibmvfc_fcp_rsp_info info; + u8 sense[SCSI_SENSE_BUFFERSIZE + sizeof(struct ibmvfc_fcp_rsp_info)]; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_fcp_rsp { + __be64 reserved; + __be16 retry_delay_timer; + u8 flags; + u8 scsi_status; + __be32 fcp_resid; + __be32 fcp_sense_len; + __be32 fcp_rsp_len; + union ibmvfc_fcp_rsp_data data; +}__attribute__((packed, aligned (8))); + +enum ibmvfc_cmd_flags { + IBMVFC_SCATTERLIST = 0x0001, + IBMVFC_NO_MEM_DESC = 0x0002, + IBMVFC_READ = 0x0004, + IBMVFC_WRITE = 0x0008, + IBMVFC_TMF = 0x0080, + IBMVFC_CLASS_3_ERR = 0x0100, +}; + +enum ibmvfc_fc_task_attr { + IBMVFC_SIMPLE_TASK = 0x00, + IBMVFC_HEAD_OF_QUEUE = 0x01, + IBMVFC_ORDERED_TASK = 0x02, + IBMVFC_ACA_TASK = 0x04, +}; + +enum ibmvfc_fc_tmf_flags { + IBMVFC_ABORT_TASK_SET = 0x02, + IBMVFC_LUN_RESET = 0x10, + IBMVFC_TARGET_RESET = 0x20, +}; + +struct ibmvfc_fcp_cmd_iu { + struct scsi_lun lun; + u8 crn; + u8 pri_task_attr; + u8 tmf_flags; + u8 add_cdb_len; +#define IBMVFC_RDDATA 0x02 +#define IBMVFC_WRDATA 0x01 + u8 cdb[IBMVFC_MAX_CDB_LEN]; + __be32 xfer_len; +}__attribute__((packed, aligned (4))); + +struct ibmvfc_cmd { + __be64 task_tag; + __be32 frame_type; + __be32 payload_len; + __be32 resp_len; + __be32 adapter_resid; + __be16 status; + __be16 error; + __be16 flags; + __be16 response_flags; +#define IBMVFC_ADAPTER_RESID_VALID 0x01 + __be32 cancel_key; + __be32 exchange_id; + struct srp_direct_buf ext_func; + struct srp_direct_buf ioba; + struct srp_direct_buf resp; + __be64 correlation; + __be64 tgt_scsi_id; + __be64 tag; + __be64 reserved3[2]; + struct ibmvfc_fcp_cmd_iu iu; + struct ibmvfc_fcp_rsp rsp; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_passthru_fc_iu { + __be32 payload[7]; +#define IBMVFC_ADISC 0x52000000 + __be32 response[7]; +}; + +struct ibmvfc_passthru_iu { + __be64 task_tag; + __be32 cmd_len; + __be32 rsp_len; + __be16 status; + __be16 error; + __be32 flags; +#define IBMVFC_FC_ELS 0x01 +#define IBMVFC_FC_CT_IU 0x02 + __be32 cancel_key; +#define IBMVFC_PASSTHRU_CANCEL_KEY 0x80000000 +#define IBMVFC_INTERNAL_CANCEL_KEY 0x80000001 + __be32 reserved; + struct srp_direct_buf cmd; + struct srp_direct_buf rsp; + __be64 correlation; + __be64 scsi_id; + __be64 tag; + __be64 reserved2[2]; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_passthru_mad { + struct ibmvfc_mad_common common; + struct srp_direct_buf cmd_ioba; + struct ibmvfc_passthru_iu iu; + struct ibmvfc_passthru_fc_iu fc_iu; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_trace_start_entry { + u32 xfer_len; +}__attribute__((packed)); + +struct ibmvfc_trace_end_entry { + u16 status; + u16 error; + u8 fcp_rsp_flags; + u8 rsp_code; + u8 scsi_status; + u8 reserved; +}__attribute__((packed)); + +struct ibmvfc_trace_entry { + struct ibmvfc_event *evt; + u32 time; + u32 scsi_id; + u32 lun; + u8 fmt; + u8 op_code; + u8 tmf_flags; + u8 type; +#define IBMVFC_TRC_START 0x00 +#define IBMVFC_TRC_END 0xff + union { + struct ibmvfc_trace_start_entry start; + struct ibmvfc_trace_end_entry end; + } u; +}__attribute__((packed, aligned (8))); + +enum ibmvfc_crq_formats { + IBMVFC_CMD_FORMAT = 0x01, + IBMVFC_ASYNC_EVENT = 0x02, + IBMVFC_MAD_FORMAT = 0x04, +}; + +enum ibmvfc_async_event { + IBMVFC_AE_ELS_PLOGI = 0x0001, + IBMVFC_AE_ELS_LOGO = 0x0002, + IBMVFC_AE_ELS_PRLO = 0x0004, + IBMVFC_AE_SCN_NPORT = 0x0008, + IBMVFC_AE_SCN_GROUP = 0x0010, + IBMVFC_AE_SCN_DOMAIN = 0x0020, + IBMVFC_AE_SCN_FABRIC = 0x0040, + IBMVFC_AE_LINK_UP = 0x0080, + IBMVFC_AE_LINK_DOWN = 0x0100, + IBMVFC_AE_LINK_DEAD = 0x0200, + IBMVFC_AE_HALT = 0x0400, + IBMVFC_AE_RESUME = 0x0800, + IBMVFC_AE_ADAPTER_FAILED = 0x1000, +}; + +struct ibmvfc_async_desc { + const char *desc; + enum ibmvfc_async_event ae; + int log_level; +}; + +struct ibmvfc_crq { + volatile u8 valid; + volatile u8 format; + u8 reserved[6]; + volatile __be64 ioba; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_crq_queue { + struct ibmvfc_crq *msgs; + int size, cur; + dma_addr_t msg_token; +}; + +enum ibmvfc_ae_link_state { + IBMVFC_AE_LS_LINK_UP = 0x01, + IBMVFC_AE_LS_LINK_BOUNCED = 0x02, + IBMVFC_AE_LS_LINK_DOWN = 0x04, + IBMVFC_AE_LS_LINK_DEAD = 0x08, +}; + +struct ibmvfc_async_crq { + volatile u8 valid; + u8 link_state; + u8 pad[2]; + __be32 pad2; + volatile __be64 event; + volatile __be64 scsi_id; + volatile __be64 wwpn; + volatile __be64 node_name; + __be64 reserved; +}__attribute__((packed, aligned (8))); + +struct ibmvfc_async_crq_queue { + struct ibmvfc_async_crq *msgs; + int size, cur; + dma_addr_t msg_token; +}; + +union ibmvfc_iu { + struct ibmvfc_mad_common mad_common; + struct ibmvfc_npiv_login_mad npiv_login; + struct ibmvfc_npiv_logout_mad npiv_logout; + struct ibmvfc_discover_targets discover_targets; + struct ibmvfc_port_login plogi; + struct ibmvfc_process_login prli; + struct ibmvfc_query_tgt query_tgt; + struct ibmvfc_implicit_logout implicit_logout; + struct ibmvfc_tmf tmf; + struct ibmvfc_cmd cmd; + struct ibmvfc_passthru_mad passthru; +}__attribute__((packed, aligned (8))); + +enum ibmvfc_target_action { + IBMVFC_TGT_ACTION_NONE = 0, + IBMVFC_TGT_ACTION_INIT, + IBMVFC_TGT_ACTION_INIT_WAIT, + IBMVFC_TGT_ACTION_DEL_RPORT, + IBMVFC_TGT_ACTION_DELETED_RPORT, +}; + +struct ibmvfc_target { + struct list_head queue; + struct ibmvfc_host *vhost; + u64 scsi_id; + u64 new_scsi_id; + struct fc_rport *rport; + int target_id; + enum ibmvfc_target_action action; + int need_login; + int add_rport; + int init_retries; + int logo_rcvd; + u32 cancel_key; + struct ibmvfc_service_parms service_parms; + struct ibmvfc_service_parms service_parms_change; + struct fc_rport_identifiers ids; + void (*job_step) (struct ibmvfc_target *); + struct timer_list timer; + struct kref kref; +}; + +/* a unit of work for the hosting partition */ +struct ibmvfc_event { + struct list_head queue; + struct ibmvfc_host *vhost; + struct ibmvfc_target *tgt; + struct scsi_cmnd *cmnd; + atomic_t free; + union ibmvfc_iu *xfer_iu; + void (*done) (struct ibmvfc_event *); + struct ibmvfc_crq crq; + union ibmvfc_iu iu; + union ibmvfc_iu *sync_iu; + struct srp_direct_buf *ext_list; + dma_addr_t ext_list_token; + struct completion comp; + struct completion *eh_comp; + struct timer_list timer; +}; + +/* a pool of event structs for use */ +struct ibmvfc_event_pool { + struct ibmvfc_event *events; + u32 size; + union ibmvfc_iu *iu_storage; + dma_addr_t iu_token; +}; + +enum ibmvfc_host_action { + IBMVFC_HOST_ACTION_NONE = 0, + IBMVFC_HOST_ACTION_RESET, + IBMVFC_HOST_ACTION_REENABLE, + IBMVFC_HOST_ACTION_LOGO, + IBMVFC_HOST_ACTION_LOGO_WAIT, + IBMVFC_HOST_ACTION_INIT, + IBMVFC_HOST_ACTION_INIT_WAIT, + IBMVFC_HOST_ACTION_QUERY, + IBMVFC_HOST_ACTION_QUERY_TGTS, + IBMVFC_HOST_ACTION_TGT_DEL, + IBMVFC_HOST_ACTION_ALLOC_TGTS, + IBMVFC_HOST_ACTION_TGT_INIT, + IBMVFC_HOST_ACTION_TGT_DEL_FAILED, +}; + +enum ibmvfc_host_state { + IBMVFC_NO_CRQ = 0, + IBMVFC_INITIALIZING, + IBMVFC_ACTIVE, + IBMVFC_HALTED, + IBMVFC_LINK_DOWN, + IBMVFC_LINK_DEAD, + IBMVFC_HOST_OFFLINE, +}; + +struct ibmvfc_host { + char name[8]; + struct list_head queue; + struct Scsi_Host *host; + enum ibmvfc_host_state state; + enum ibmvfc_host_action action; +#define IBMVFC_NUM_TRACE_INDEX_BITS 8 +#define IBMVFC_NUM_TRACE_ENTRIES (1 << IBMVFC_NUM_TRACE_INDEX_BITS) +#define IBMVFC_TRACE_SIZE (sizeof(struct ibmvfc_trace_entry) * IBMVFC_NUM_TRACE_ENTRIES) + struct ibmvfc_trace_entry *trace; + u32 trace_index:IBMVFC_NUM_TRACE_INDEX_BITS; + int num_targets; + struct list_head targets; + struct list_head sent; + struct list_head free; + struct device *dev; + struct ibmvfc_event_pool pool; + struct dma_pool *sg_pool; + mempool_t *tgt_pool; + struct ibmvfc_crq_queue crq; + struct ibmvfc_async_crq_queue async_crq; + struct ibmvfc_npiv_login login_info; + union ibmvfc_npiv_login_data *login_buf; + dma_addr_t login_buf_dma; + int disc_buf_sz; + int log_level; + struct ibmvfc_discover_targets_buf *disc_buf; + struct mutex passthru_mutex; + int task_set; + int init_retries; + int discovery_threads; + int abort_threads; + int client_migrated; + int reinit; + int delay_init; + int scan_complete; + int logged_in; + int aborting_passthru; + int events_to_log; +#define IBMVFC_AE_LINKUP 0x0001 +#define IBMVFC_AE_LINKDOWN 0x0002 +#define IBMVFC_AE_RSCN 0x0004 + dma_addr_t disc_buf_dma; + unsigned int partition_number; + char partition_name[97]; + void (*job_step) (struct ibmvfc_host *); + struct task_struct *work_thread; + struct tasklet_struct tasklet; + struct work_struct rport_add_work_q; + wait_queue_head_t init_wait_q; + wait_queue_head_t work_wait_q; +}; + +#define DBG_CMD(CMD) do { if (ibmvfc_debug) CMD; } while (0) + +#define tgt_dbg(t, fmt, ...) \ + DBG_CMD(dev_info((t)->vhost->dev, "%llX: " fmt, (t)->scsi_id, ##__VA_ARGS__)) + +#define tgt_info(t, fmt, ...) \ + dev_info((t)->vhost->dev, "%llX: " fmt, (t)->scsi_id, ##__VA_ARGS__) + +#define tgt_err(t, fmt, ...) \ + dev_err((t)->vhost->dev, "%llX: " fmt, (t)->scsi_id, ##__VA_ARGS__) + +#define tgt_log(t, level, fmt, ...) \ + do { \ + if ((t)->vhost->log_level >= level) \ + tgt_err(t, fmt, ##__VA_ARGS__); \ + } while (0) + +#define ibmvfc_dbg(vhost, ...) \ + DBG_CMD(dev_info((vhost)->dev, ##__VA_ARGS__)) + +#define ibmvfc_log(vhost, level, ...) \ + do { \ + if ((vhost)->log_level >= level) \ + dev_err((vhost)->dev, ##__VA_ARGS__); \ + } while (0) + +#define ENTER DBG_CMD(printk(KERN_INFO IBMVFC_NAME": Entering %s\n", __func__)) +#define LEAVE DBG_CMD(printk(KERN_INFO IBMVFC_NAME": Leaving %s\n", __func__)) + +#ifdef CONFIG_SCSI_IBMVFC_TRACE +#define ibmvfc_create_trace_file(kobj, attr) sysfs_create_bin_file(kobj, attr) +#define ibmvfc_remove_trace_file(kobj, attr) sysfs_remove_bin_file(kobj, attr) +#else +#define ibmvfc_create_trace_file(kobj, attr) 0 +#define ibmvfc_remove_trace_file(kobj, attr) do { } while (0) +#endif + +#endif diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c new file mode 100644 index 000000000..036508a4b --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -0,0 +1,2394 @@ +/* ------------------------------------------------------------ + * ibmvscsi.c + * (C) Copyright IBM Corporation 1994, 2004 + * Authors: Colin DeVilbiss (devilbis@us.ibm.com) + * Santiago Leon (santil@us.ibm.com) + * Dave Boutcher (sleddog@us.ibm.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + * USA + * + * ------------------------------------------------------------ + * Emulation of a SCSI host adapter for Virtual I/O devices + * + * This driver supports the SCSI adapter implemented by the IBM + * Power5 firmware. That SCSI adapter is not a physical adapter, + * but allows Linux SCSI peripheral drivers to directly + * access devices in another logical partition on the physical system. + * + * The virtual adapter(s) are present in the open firmware device + * tree just like real adapters. + * + * One of the capabilities provided on these systems is the ability + * to DMA between partitions. The architecture states that for VSCSI, + * the server side is allowed to DMA to and from the client. The client + * is never trusted to DMA to or from the server directly. + * + * Messages are sent between partitions on a "Command/Response Queue" + * (CRQ), which is just a buffer of 16 byte entries in the receiver's + * Senders cannot access the buffer directly, but send messages by + * making a hypervisor call and passing in the 16 bytes. The hypervisor + * puts the message in the next 16 byte space in round-robin fashion, + * turns on the high order bit of the message (the valid bit), and + * generates an interrupt to the receiver (if interrupts are turned on.) + * The receiver just turns off the valid bit when they have copied out + * the message. + * + * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit + * (IU) (as defined in the T10 standard available at www.t10.org), gets + * a DMA address for the message, and sends it to the server as the + * payload of a CRQ message. The server DMAs the SRP IU and processes it, + * including doing any additional data transfers. When it is done, it + * DMAs the SRP response back to the same address as the request came from, + * and sends a CRQ message back to inform the client that the request has + * completed. + * + * TODO: This is currently pretty tied to the IBM pSeries hypervisor + * interfaces. It would be really nice to abstract this above an RDMA + * layer. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/dma-mapping.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/pm.h> +#include <linux/kthread.h> +#include <asm/firmware.h> +#include <asm/vio.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_transport_srp.h> +#include "ibmvscsi.h" + +/* The values below are somewhat arbitrary default values, but + * OS/400 will use 3 busses (disks, CDs, tapes, I think.) + * Note that there are 3 bits of channel value, 6 bits of id, and + * 5 bits of LUN. + */ +static int max_id = 64; +static int max_channel = 3; +static int init_timeout = 300; +static int login_timeout = 60; +static int info_timeout = 30; +static int abort_timeout = 60; +static int reset_timeout = 60; +static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; +static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; +static int fast_fail = 1; +static int client_reserve = 1; +static char partition_name[96] = "UNKNOWN"; +static unsigned int partition_number = -1; +static LIST_HEAD(ibmvscsi_head); +static DEFINE_SPINLOCK(ibmvscsi_driver_lock); + +static struct scsi_transport_template *ibmvscsi_transport_template; + +#define IBMVSCSI_VERSION "1.5.9" + +MODULE_DESCRIPTION("IBM Virtual SCSI"); +MODULE_AUTHOR("Dave Boutcher"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(IBMVSCSI_VERSION); + +module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]"); +module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]"); +module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); +module_param_named(max_requests, max_requests, int, S_IRUGO); +MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); +module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); +module_param_named(client_reserve, client_reserve, int, S_IRUGO ); +MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); + +static void ibmvscsi_handle_crq(struct viosrp_crq *crq, + struct ibmvscsi_host_data *hostdata); + +/* ------------------------------------------------------------ + * Routines for managing the command/response queue + */ +/** + * ibmvscsi_handle_event: - Interrupt handler for crq events + * @irq: number of irq to handle, not used + * @dev_instance: ibmvscsi_host_data of host that received interrupt + * + * Disables interrupts and schedules srp_task + * Always returns IRQ_HANDLED + */ +static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance) +{ + struct ibmvscsi_host_data *hostdata = + (struct ibmvscsi_host_data *)dev_instance; + vio_disable_interrupts(to_vio_dev(hostdata->dev)); + tasklet_schedule(&hostdata->srp_task); + return IRQ_HANDLED; +} + +/** + * release_crq_queue: - Deallocates data and unregisters CRQ + * @queue: crq_queue to initialize and register + * @host_data: ibmvscsi_host_data of host + * + * Frees irq, deallocates a page for messages, unmaps dma, and unregisters + * the crq with the hypervisor. + */ +static void ibmvscsi_release_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests) +{ + long rc = 0; + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + free_irq(vdev->irq, (void *)hostdata); + tasklet_kill(&hostdata->srp_task); + do { + if (rc) + msleep(100); + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); + dma_unmap_single(hostdata->dev, + queue->msg_token, + queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); + free_page((unsigned long)queue->msgs); +} + +/** + * crq_queue_next_crq: - Returns the next entry in message queue + * @queue: crq_queue to use + * + * Returns pointer to next entry in queue, or NULL if there are no new + * entried in the CRQ. + */ +static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) +{ + struct viosrp_crq *crq; + unsigned long flags; + + spin_lock_irqsave(&queue->lock, flags); + crq = &queue->msgs[queue->cur]; + if (crq->valid != VIOSRP_CRQ_FREE) { + if (++queue->cur == queue->size) + queue->cur = 0; + + /* Ensure the read of the valid bit occurs before reading any + * other bits of the CRQ entry + */ + rmb(); + } else + crq = NULL; + spin_unlock_irqrestore(&queue->lock, flags); + + return crq; +} + +/** + * ibmvscsi_send_crq: - Send a CRQ + * @hostdata: the adapter + * @word1: the first 64 bits of the data + * @word2: the second 64 bits of the data + */ +static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, + u64 word1, u64 word2) +{ + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + + /* + * Ensure the command buffer is flushed to memory before handing it + * over to the VIOS to prevent it from fetching any stale data. + */ + mb(); + return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); +} + +/** + * ibmvscsi_task: - Process srps asynchronously + * @data: ibmvscsi_host_data of host + */ +static void ibmvscsi_task(void *data) +{ + struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + struct viosrp_crq *crq; + int done = 0; + + while (!done) { + /* Pull all the valid messages off the CRQ */ + while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { + ibmvscsi_handle_crq(crq, hostdata); + crq->valid = VIOSRP_CRQ_FREE; + wmb(); + } + + vio_enable_interrupts(vdev); + crq = crq_queue_next_crq(&hostdata->queue); + if (crq != NULL) { + vio_disable_interrupts(vdev); + ibmvscsi_handle_crq(crq, hostdata); + crq->valid = VIOSRP_CRQ_FREE; + wmb(); + } else { + done = 1; + } + } +} + +static void gather_partition_info(void) +{ + const char *ppartition_name; + const __be32 *p_number_ptr; + + /* Retrieve information about this partition */ + if (!of_root) + return; + + of_node_get(of_root); + + ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL); + if (ppartition_name) + strlcpy(partition_name, ppartition_name, + sizeof(partition_name)); + p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL); + if (p_number_ptr) + partition_number = of_read_number(p_number_ptr, 1); + of_node_put(of_root); +} + +static void set_adapter_info(struct ibmvscsi_host_data *hostdata) +{ + memset(&hostdata->madapter_info, 0x00, + sizeof(hostdata->madapter_info)); + + dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); + strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); + + strncpy(hostdata->madapter_info.partition_name, partition_name, + sizeof(hostdata->madapter_info.partition_name)); + + hostdata->madapter_info.partition_number = + cpu_to_be32(partition_number); + + hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1); + hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX); +} + +/** + * reset_crq_queue: - resets a crq after a failure + * @queue: crq_queue to initialize and register + * @hostdata: ibmvscsi_host_data of host + * + */ +static int ibmvscsi_reset_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata) +{ + int rc = 0; + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + + /* Close the CRQ */ + do { + if (rc) + msleep(100); + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); + + /* Clean out the queue */ + memset(queue->msgs, 0x00, PAGE_SIZE); + queue->cur = 0; + + set_adapter_info(hostdata); + + /* And re-open it again */ + rc = plpar_hcall_norets(H_REG_CRQ, + vdev->unit_address, + queue->msg_token, PAGE_SIZE); + if (rc == H_CLOSED) { + /* Adapter is good, but other end is not ready */ + dev_warn(hostdata->dev, "Partner adapter not ready\n"); + } else if (rc != 0) { + dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); + } + return rc; +} + +/** + * initialize_crq_queue: - Initializes and registers CRQ with hypervisor + * @queue: crq_queue to initialize and register + * @hostdata: ibmvscsi_host_data of host + * + * Allocates a page for messages, maps it for dma, and registers + * the crq with the hypervisor. + * Returns zero on success. + */ +static int ibmvscsi_init_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata, + int max_requests) +{ + int rc; + int retrc; + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + + queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); + + if (!queue->msgs) + goto malloc_failed; + queue->size = PAGE_SIZE / sizeof(*queue->msgs); + + queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, + queue->size * sizeof(*queue->msgs), + DMA_BIDIRECTIONAL); + + if (dma_mapping_error(hostdata->dev, queue->msg_token)) + goto map_failed; + + gather_partition_info(); + set_adapter_info(hostdata); + + retrc = rc = plpar_hcall_norets(H_REG_CRQ, + vdev->unit_address, + queue->msg_token, PAGE_SIZE); + if (rc == H_RESOURCE) + /* maybe kexecing and resource is busy. try a reset */ + rc = ibmvscsi_reset_crq_queue(queue, + hostdata); + + if (rc == H_CLOSED) { + /* Adapter is good, but other end is not ready */ + dev_warn(hostdata->dev, "Partner adapter not ready\n"); + retrc = 0; + } else if (rc != 0) { + dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); + goto reg_crq_failed; + } + + queue->cur = 0; + spin_lock_init(&queue->lock); + + tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, + (unsigned long)hostdata); + + if (request_irq(vdev->irq, + ibmvscsi_handle_event, + 0, "ibmvscsi", (void *)hostdata) != 0) { + dev_err(hostdata->dev, "couldn't register irq 0x%x\n", + vdev->irq); + goto req_irq_failed; + } + + rc = vio_enable_interrupts(vdev); + if (rc != 0) { + dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); + goto req_irq_failed; + } + + return retrc; + + req_irq_failed: + tasklet_kill(&hostdata->srp_task); + rc = 0; + do { + if (rc) + msleep(100); + rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); + } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); + reg_crq_failed: + dma_unmap_single(hostdata->dev, + queue->msg_token, + queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); + map_failed: + free_page((unsigned long)queue->msgs); + malloc_failed: + return -1; +} + +/** + * reenable_crq_queue: - reenables a crq after + * @queue: crq_queue to initialize and register + * @hostdata: ibmvscsi_host_data of host + * + */ +static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, + struct ibmvscsi_host_data *hostdata) +{ + int rc = 0; + struct vio_dev *vdev = to_vio_dev(hostdata->dev); + + set_adapter_info(hostdata); + + /* Re-enable the CRQ */ + do { + if (rc) + msleep(100); + rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); + } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); + + if (rc) + dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); + return rc; +} + +/* ------------------------------------------------------------ + * Routines for the event pool and event structs + */ +/** + * initialize_event_pool: - Allocates and initializes the event pool for a host + * @pool: event_pool to be initialized + * @size: Number of events in pool + * @hostdata: ibmvscsi_host_data who owns the event pool + * + * Returns zero on success. +*/ +static int initialize_event_pool(struct event_pool *pool, + int size, struct ibmvscsi_host_data *hostdata) +{ + int i; + + pool->size = size; + pool->next = 0; + pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); + if (!pool->events) + return -ENOMEM; + + pool->iu_storage = + dma_alloc_coherent(hostdata->dev, + pool->size * sizeof(*pool->iu_storage), + &pool->iu_token, 0); + if (!pool->iu_storage) { + kfree(pool->events); + return -ENOMEM; + } + + for (i = 0; i < pool->size; ++i) { + struct srp_event_struct *evt = &pool->events[i]; + memset(&evt->crq, 0x00, sizeof(evt->crq)); + atomic_set(&evt->free, 1); + evt->crq.valid = VIOSRP_CRQ_CMD_RSP; + evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu)); + evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token + + sizeof(*evt->xfer_iu) * i); + evt->xfer_iu = pool->iu_storage + i; + evt->hostdata = hostdata; + evt->ext_list = NULL; + evt->ext_list_token = 0; + } + + return 0; +} + +/** + * release_event_pool: - Frees memory of an event pool of a host + * @pool: event_pool to be released + * @hostdata: ibmvscsi_host_data who owns the even pool + * + * Returns zero on success. +*/ +static void release_event_pool(struct event_pool *pool, + struct ibmvscsi_host_data *hostdata) +{ + int i, in_use = 0; + for (i = 0; i < pool->size; ++i) { + if (atomic_read(&pool->events[i].free) != 1) + ++in_use; + if (pool->events[i].ext_list) { + dma_free_coherent(hostdata->dev, + SG_ALL * sizeof(struct srp_direct_buf), + pool->events[i].ext_list, + pool->events[i].ext_list_token); + } + } + if (in_use) + dev_warn(hostdata->dev, "releasing event pool with %d " + "events still in use?\n", in_use); + kfree(pool->events); + dma_free_coherent(hostdata->dev, + pool->size * sizeof(*pool->iu_storage), + pool->iu_storage, pool->iu_token); +} + +/** + * valid_event_struct: - Determines if event is valid. + * @pool: event_pool that contains the event + * @evt: srp_event_struct to be checked for validity + * + * Returns zero if event is invalid, one otherwise. +*/ +static int valid_event_struct(struct event_pool *pool, + struct srp_event_struct *evt) +{ + int index = evt - pool->events; + if (index < 0 || index >= pool->size) /* outside of bounds */ + return 0; + if (evt != pool->events + index) /* unaligned */ + return 0; + return 1; +} + +/** + * ibmvscsi_free-event_struct: - Changes status of event to "free" + * @pool: event_pool that contains the event + * @evt: srp_event_struct to be modified + * +*/ +static void free_event_struct(struct event_pool *pool, + struct srp_event_struct *evt) +{ + if (!valid_event_struct(pool, evt)) { + dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " + "(not in pool %p)\n", evt, pool->events); + return; + } + if (atomic_inc_return(&evt->free) != 1) { + dev_err(evt->hostdata->dev, "Freeing event_struct %p " + "which is not in use!\n", evt); + return; + } +} + +/** + * get_evt_struct: - Gets the next free event in pool + * @pool: event_pool that contains the events to be searched + * + * Returns the next event in "free" state, and NULL if none are free. + * Note that no synchronization is done here, we assume the host_lock + * will syncrhonze things. +*/ +static struct srp_event_struct *get_event_struct(struct event_pool *pool) +{ + int i; + int poolsize = pool->size; + int offset = pool->next; + + for (i = 0; i < poolsize; i++) { + offset = (offset + 1) % poolsize; + if (!atomic_dec_if_positive(&pool->events[offset].free)) { + pool->next = offset; + return &pool->events[offset]; + } + } + + printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); + return NULL; +} + +/** + * init_event_struct: Initialize fields in an event struct that are always + * required. + * @evt: The event + * @done: Routine to call when the event is responded to + * @format: SRP or MAD format + * @timeout: timeout value set in the CRQ + */ +static void init_event_struct(struct srp_event_struct *evt_struct, + void (*done) (struct srp_event_struct *), + u8 format, + int timeout) +{ + evt_struct->cmnd = NULL; + evt_struct->cmnd_done = NULL; + evt_struct->sync_srp = NULL; + evt_struct->crq.format = format; + evt_struct->crq.timeout = cpu_to_be16(timeout); + evt_struct->done = done; +} + +/* ------------------------------------------------------------ + * Routines for receiving SCSI responses from the hosting partition + */ + +/** + * set_srp_direction: Set the fields in the srp related to data + * direction and number of buffers based on the direction in + * the scsi_cmnd and the number of buffers + */ +static void set_srp_direction(struct scsi_cmnd *cmd, + struct srp_cmd *srp_cmd, + int numbuf) +{ + u8 fmt; + + if (numbuf == 0) + return; + + if (numbuf == 1) + fmt = SRP_DATA_DESC_DIRECT; + else { + fmt = SRP_DATA_DESC_INDIRECT; + numbuf = min(numbuf, MAX_INDIRECT_BUFS); + + if (cmd->sc_data_direction == DMA_TO_DEVICE) + srp_cmd->data_out_desc_cnt = numbuf; + else + srp_cmd->data_in_desc_cnt = numbuf; + } + + if (cmd->sc_data_direction == DMA_TO_DEVICE) + srp_cmd->buf_fmt = fmt << 4; + else + srp_cmd->buf_fmt = fmt; +} + +/** + * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format + * @cmd: srp_cmd whose additional_data member will be unmapped + * @dev: device for which the memory is mapped + * +*/ +static void unmap_cmd_data(struct srp_cmd *cmd, + struct srp_event_struct *evt_struct, + struct device *dev) +{ + u8 out_fmt, in_fmt; + + out_fmt = cmd->buf_fmt >> 4; + in_fmt = cmd->buf_fmt & ((1U << 4) - 1); + + if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) + return; + + if (evt_struct->cmnd) + scsi_dma_unmap(evt_struct->cmnd); +} + +static int map_sg_list(struct scsi_cmnd *cmd, int nseg, + struct srp_direct_buf *md) +{ + int i; + struct scatterlist *sg; + u64 total_length = 0; + + scsi_for_each_sg(cmd, sg, nseg, i) { + struct srp_direct_buf *descr = md + i; + descr->va = cpu_to_be64(sg_dma_address(sg)); + descr->len = cpu_to_be32(sg_dma_len(sg)); + descr->key = 0; + total_length += sg_dma_len(sg); + } + return total_length; +} + +/** + * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields + * @cmd: struct scsi_cmnd with the scatterlist + * @srp_cmd: srp_cmd that contains the memory descriptor + * @dev: device for which to map dma memory + * + * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. + * Returns 1 on success. +*/ +static int map_sg_data(struct scsi_cmnd *cmd, + struct srp_event_struct *evt_struct, + struct srp_cmd *srp_cmd, struct device *dev) +{ + + int sg_mapped; + u64 total_length = 0; + struct srp_direct_buf *data = + (struct srp_direct_buf *) srp_cmd->add_data; + struct srp_indirect_buf *indirect = + (struct srp_indirect_buf *) data; + + sg_mapped = scsi_dma_map(cmd); + if (!sg_mapped) + return 1; + else if (sg_mapped < 0) + return 0; + + set_srp_direction(cmd, srp_cmd, sg_mapped); + + /* special case; we can use a single direct descriptor */ + if (sg_mapped == 1) { + map_sg_list(cmd, sg_mapped, data); + return 1; + } + + indirect->table_desc.va = 0; + indirect->table_desc.len = cpu_to_be32(sg_mapped * + sizeof(struct srp_direct_buf)); + indirect->table_desc.key = 0; + + if (sg_mapped <= MAX_INDIRECT_BUFS) { + total_length = map_sg_list(cmd, sg_mapped, + &indirect->desc_list[0]); + indirect->len = cpu_to_be32(total_length); + return 1; + } + + /* get indirect table */ + if (!evt_struct->ext_list) { + evt_struct->ext_list = (struct srp_direct_buf *) + dma_alloc_coherent(dev, + SG_ALL * sizeof(struct srp_direct_buf), + &evt_struct->ext_list_token, 0); + if (!evt_struct->ext_list) { + if (!firmware_has_feature(FW_FEATURE_CMO)) + sdev_printk(KERN_ERR, cmd->device, + "Can't allocate memory " + "for indirect table\n"); + scsi_dma_unmap(cmd); + return 0; + } + } + + total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); + + indirect->len = cpu_to_be32(total_length); + indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token); + indirect->table_desc.len = cpu_to_be32(sg_mapped * + sizeof(indirect->desc_list[0])); + memcpy(indirect->desc_list, evt_struct->ext_list, + MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); + return 1; +} + +/** + * map_data_for_srp_cmd: - Calls functions to map data for srp cmds + * @cmd: struct scsi_cmnd with the memory to be mapped + * @srp_cmd: srp_cmd that contains the memory descriptor + * @dev: dma device for which to map dma memory + * + * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds + * Returns 1 on success. +*/ +static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, + struct srp_event_struct *evt_struct, + struct srp_cmd *srp_cmd, struct device *dev) +{ + switch (cmd->sc_data_direction) { + case DMA_FROM_DEVICE: + case DMA_TO_DEVICE: + break; + case DMA_NONE: + return 1; + case DMA_BIDIRECTIONAL: + sdev_printk(KERN_ERR, cmd->device, + "Can't map DMA_BIDIRECTIONAL to read/write\n"); + return 0; + default: + sdev_printk(KERN_ERR, cmd->device, + "Unknown data direction 0x%02x; can't map!\n", + cmd->sc_data_direction); + return 0; + } + + return map_sg_data(cmd, evt_struct, srp_cmd, dev); +} + +/** + * purge_requests: Our virtual adapter just shut down. purge any sent requests + * @hostdata: the adapter + */ +static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) +{ + struct srp_event_struct *evt; + unsigned long flags; + + spin_lock_irqsave(hostdata->host->host_lock, flags); + while (!list_empty(&hostdata->sent)) { + evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); + list_del(&evt->list); + del_timer(&evt->timer); + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + if (evt->cmnd) { + evt->cmnd->result = (error_code << 16); + unmap_cmd_data(&evt->iu.srp.cmd, evt, + evt->hostdata->dev); + if (evt->cmnd_done) + evt->cmnd_done(evt->cmnd); + } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT && + evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ) + evt->done(evt); + free_event_struct(&evt->hostdata->pool, evt); + spin_lock_irqsave(hostdata->host->host_lock, flags); + } + spin_unlock_irqrestore(hostdata->host->host_lock, flags); +} + +/** + * ibmvscsi_reset_host - Reset the connection to the server + * @hostdata: struct ibmvscsi_host_data to reset +*/ +static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) +{ + scsi_block_requests(hostdata->host); + atomic_set(&hostdata->request_limit, 0); + + purge_requests(hostdata, DID_ERROR); + hostdata->reset_crq = 1; + wake_up(&hostdata->work_wait_q); +} + +/** + * ibmvscsi_timeout - Internal command timeout handler + * @evt_struct: struct srp_event_struct that timed out + * + * Called when an internally generated command times out +*/ +static void ibmvscsi_timeout(struct timer_list *t) +{ + struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer); + struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; + + dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", + evt_struct->iu.srp.cmd.opcode); + + ibmvscsi_reset_host(hostdata); +} + + +/* ------------------------------------------------------------ + * Routines for sending and receiving SRPs + */ +/** + * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() + * @evt_struct: evt_struct to be sent + * @hostdata: ibmvscsi_host_data of host + * @timeout: timeout in seconds - 0 means do not time command + * + * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) + * Note that this routine assumes that host_lock is held for synchronization +*/ +static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, + struct ibmvscsi_host_data *hostdata, + unsigned long timeout) +{ + __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq; + int request_status = 0; + int rc; + int srp_req = 0; + + /* If we have exhausted our request limit, just fail this request, + * unless it is for a reset or abort. + * Note that there are rare cases involving driver generated requests + * (such as task management requests) that the mid layer may think we + * can handle more requests (can_queue) when we actually can't + */ + if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { + srp_req = 1; + request_status = + atomic_dec_if_positive(&hostdata->request_limit); + /* If request limit was -1 when we started, it is now even + * less than that + */ + if (request_status < -1) + goto send_error; + /* Otherwise, we may have run out of requests. */ + /* If request limit was 0 when we started the adapter is in the + * process of performing a login with the server adapter, or + * we may have run out of requests. + */ + else if (request_status == -1 && + evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) + goto send_busy; + /* Abort and reset calls should make it through. + * Nothing except abort and reset should use the last two + * slots unless we had two or less to begin with. + */ + else if (request_status < 2 && + evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { + /* In the case that we have less than two requests + * available, check the server limit as a combination + * of the request limit and the number of requests + * in-flight (the size of the send list). If the + * server limit is greater than 2, return busy so + * that the last two are reserved for reset and abort. + */ + int server_limit = request_status; + struct srp_event_struct *tmp_evt; + + list_for_each_entry(tmp_evt, &hostdata->sent, list) { + server_limit++; + } + + if (server_limit > 2) + goto send_busy; + } + } + + /* Copy the IU into the transfer area */ + *evt_struct->xfer_iu = evt_struct->iu; + evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; + + /* Add this to the sent list. We need to do this + * before we actually send + * in case it comes back REALLY fast + */ + list_add_tail(&evt_struct->list, &hostdata->sent); + + timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0); + if (timeout) { + evt_struct->timer.expires = jiffies + (timeout * HZ); + add_timer(&evt_struct->timer); + } + + rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]), + be64_to_cpu(crq_as_u64[1])); + if (rc != 0) { + list_del(&evt_struct->list); + del_timer(&evt_struct->timer); + + /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. + * Firmware will send a CRQ with a transport event (0xFF) to + * tell this client what has happened to the transport. This + * will be handled in ibmvscsi_handle_crq() + */ + if (rc == H_CLOSED) { + dev_warn(hostdata->dev, "send warning. " + "Receive queue closed, will retry.\n"); + goto send_busy; + } + dev_err(hostdata->dev, "send error %d\n", rc); + if (srp_req) + atomic_inc(&hostdata->request_limit); + goto send_error; + } + + return 0; + + send_busy: + unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); + + free_event_struct(&hostdata->pool, evt_struct); + if (srp_req && request_status != -1) + atomic_inc(&hostdata->request_limit); + return SCSI_MLQUEUE_HOST_BUSY; + + send_error: + unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); + + if (evt_struct->cmnd != NULL) { + evt_struct->cmnd->result = DID_ERROR << 16; + evt_struct->cmnd_done(evt_struct->cmnd); + } else if (evt_struct->done) + evt_struct->done(evt_struct); + + free_event_struct(&hostdata->pool, evt_struct); + return 0; +} + +/** + * handle_cmd_rsp: - Handle responses from commands + * @evt_struct: srp_event_struct to be handled + * + * Used as a callback by when sending scsi cmds. + * Gets called by ibmvscsi_handle_crq() +*/ +static void handle_cmd_rsp(struct srp_event_struct *evt_struct) +{ + struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; + struct scsi_cmnd *cmnd = evt_struct->cmnd; + + if (unlikely(rsp->opcode != SRP_RSP)) { + if (printk_ratelimit()) + dev_warn(evt_struct->hostdata->dev, + "bad SRP RSP type %#02x\n", rsp->opcode); + } + + if (cmnd) { + cmnd->result |= rsp->status; + if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) + memcpy(cmnd->sense_buffer, + rsp->data, + be32_to_cpu(rsp->sense_data_len)); + unmap_cmd_data(&evt_struct->iu.srp.cmd, + evt_struct, + evt_struct->hostdata->dev); + + if (rsp->flags & SRP_RSP_FLAG_DOOVER) + scsi_set_resid(cmnd, + be32_to_cpu(rsp->data_out_res_cnt)); + else if (rsp->flags & SRP_RSP_FLAG_DIOVER) + scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt)); + } + + if (evt_struct->cmnd_done) + evt_struct->cmnd_done(cmnd); +} + +/** + * lun_from_dev: - Returns the lun of the scsi device + * @dev: struct scsi_device + * +*/ +static inline u16 lun_from_dev(struct scsi_device *dev) +{ + return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; +} + +/** + * ibmvscsi_queue: - The queuecommand function of the scsi template + * @cmd: struct scsi_cmnd to be executed + * @done: Callback function to be called when cmd is completed +*/ +static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd, + void (*done) (struct scsi_cmnd *)) +{ + struct srp_cmd *srp_cmd; + struct srp_event_struct *evt_struct; + struct srp_indirect_buf *indirect; + struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); + u16 lun = lun_from_dev(cmnd->device); + u8 out_fmt, in_fmt; + + cmnd->result = (DID_OK << 16); + evt_struct = get_event_struct(&hostdata->pool); + if (!evt_struct) + return SCSI_MLQUEUE_HOST_BUSY; + + /* Set up the actual SRP IU */ + srp_cmd = &evt_struct->iu.srp.cmd; + memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); + srp_cmd->opcode = SRP_CMD; + memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); + int_to_scsilun(lun, &srp_cmd->lun); + + if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { + if (!firmware_has_feature(FW_FEATURE_CMO)) + sdev_printk(KERN_ERR, cmnd->device, + "couldn't convert cmd to srp_cmd\n"); + free_event_struct(&hostdata->pool, evt_struct); + return SCSI_MLQUEUE_HOST_BUSY; + } + + init_event_struct(evt_struct, + handle_cmd_rsp, + VIOSRP_SRP_FORMAT, + cmnd->request->timeout/HZ); + + evt_struct->cmnd = cmnd; + evt_struct->cmnd_done = done; + + /* Fix up dma address of the buffer itself */ + indirect = (struct srp_indirect_buf *) srp_cmd->add_data; + out_fmt = srp_cmd->buf_fmt >> 4; + in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); + if ((in_fmt == SRP_DATA_DESC_INDIRECT || + out_fmt == SRP_DATA_DESC_INDIRECT) && + indirect->table_desc.va == 0) { + indirect->table_desc.va = + cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) + + offsetof(struct srp_cmd, add_data) + + offsetof(struct srp_indirect_buf, desc_list)); + } + + return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); +} + +static DEF_SCSI_QCMD(ibmvscsi_queuecommand) + +/* ------------------------------------------------------------ + * Routines for driver initialization + */ + +/** + * map_persist_bufs: - Pre-map persistent data for adapter logins + * @hostdata: ibmvscsi_host_data of host + * + * Map the capabilities and adapter info DMA buffers to avoid runtime failures. + * Return 1 on error, 0 on success. + */ +static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) +{ + + hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, + sizeof(hostdata->caps), DMA_BIDIRECTIONAL); + + if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { + dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); + return 1; + } + + hostdata->adapter_info_addr = dma_map_single(hostdata->dev, + &hostdata->madapter_info, + sizeof(hostdata->madapter_info), + DMA_BIDIRECTIONAL); + if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { + dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); + dma_unmap_single(hostdata->dev, hostdata->caps_addr, + sizeof(hostdata->caps), DMA_BIDIRECTIONAL); + return 1; + } + + return 0; +} + +/** + * unmap_persist_bufs: - Unmap persistent data needed for adapter logins + * @hostdata: ibmvscsi_host_data of host + * + * Unmap the capabilities and adapter info DMA buffers + */ +static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) +{ + dma_unmap_single(hostdata->dev, hostdata->caps_addr, + sizeof(hostdata->caps), DMA_BIDIRECTIONAL); + + dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, + sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); +} + +/** + * login_rsp: - Handle response to SRP login request + * @evt_struct: srp_event_struct with the response + * + * Used as a "done" callback by when sending srp_login. Gets called + * by ibmvscsi_handle_crq() +*/ +static void login_rsp(struct srp_event_struct *evt_struct) +{ + struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; + switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { + case SRP_LOGIN_RSP: /* it worked! */ + break; + case SRP_LOGIN_REJ: /* refused! */ + dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", + evt_struct->xfer_iu->srp.login_rej.reason); + /* Login failed. */ + atomic_set(&hostdata->request_limit, -1); + return; + default: + dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", + evt_struct->xfer_iu->srp.login_rsp.opcode); + /* Login failed. */ + atomic_set(&hostdata->request_limit, -1); + return; + } + + dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); + hostdata->client_migrated = 0; + + /* Now we know what the real request-limit is. + * This value is set rather than added to request_limit because + * request_limit could have been set to -1 by this client. + */ + atomic_set(&hostdata->request_limit, + be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta)); + + /* If we had any pending I/Os, kick them */ + scsi_unblock_requests(hostdata->host); +} + +/** + * send_srp_login: - Sends the srp login + * @hostdata: ibmvscsi_host_data of host + * + * Returns zero if successful. +*/ +static int send_srp_login(struct ibmvscsi_host_data *hostdata) +{ + int rc; + unsigned long flags; + struct srp_login_req *login; + struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); + + BUG_ON(!evt_struct); + init_event_struct(evt_struct, login_rsp, + VIOSRP_SRP_FORMAT, login_timeout); + + login = &evt_struct->iu.srp.login_req; + memset(login, 0, sizeof(*login)); + login->opcode = SRP_LOGIN_REQ; + login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu)); + login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | + SRP_BUF_FORMAT_INDIRECT); + + spin_lock_irqsave(hostdata->host->host_lock, flags); + /* Start out with a request limit of 0, since this is negotiated in + * the login request we are just sending and login requests always + * get sent by the driver regardless of request_limit. + */ + atomic_set(&hostdata->request_limit, 0); + + rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + dev_info(hostdata->dev, "sent SRP login\n"); + return rc; +}; + +/** + * capabilities_rsp: - Handle response to MAD adapter capabilities request + * @evt_struct: srp_event_struct with the response + * + * Used as a "done" callback by when sending adapter_info. + */ +static void capabilities_rsp(struct srp_event_struct *evt_struct) +{ + struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; + + if (evt_struct->xfer_iu->mad.capabilities.common.status) { + dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", + evt_struct->xfer_iu->mad.capabilities.common.status); + } else { + if (hostdata->caps.migration.common.server_support != + cpu_to_be16(SERVER_SUPPORTS_CAP)) + dev_info(hostdata->dev, "Partition migration not supported\n"); + + if (client_reserve) { + if (hostdata->caps.reserve.common.server_support == + cpu_to_be16(SERVER_SUPPORTS_CAP)) + dev_info(hostdata->dev, "Client reserve enabled\n"); + else + dev_info(hostdata->dev, "Client reserve not supported\n"); + } + } + + send_srp_login(hostdata); +} + +/** + * send_mad_capabilities: - Sends the mad capabilities request + * and stores the result so it can be retrieved with + * @hostdata: ibmvscsi_host_data of host + */ +static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) +{ + struct viosrp_capabilities *req; + struct srp_event_struct *evt_struct; + unsigned long flags; + struct device_node *of_node = hostdata->dev->of_node; + const char *location; + + evt_struct = get_event_struct(&hostdata->pool); + BUG_ON(!evt_struct); + + init_event_struct(evt_struct, capabilities_rsp, + VIOSRP_MAD_FORMAT, info_timeout); + + req = &evt_struct->iu.mad.capabilities; + memset(req, 0, sizeof(*req)); + + hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED); + if (hostdata->client_migrated) + hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED); + + strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), + sizeof(hostdata->caps.name)); + + location = of_get_property(of_node, "ibm,loc-code", NULL); + location = location ? location : dev_name(hostdata->dev); + strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); + + req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE); + req->buffer = cpu_to_be64(hostdata->caps_addr); + + hostdata->caps.migration.common.cap_type = + cpu_to_be32(MIGRATION_CAPABILITIES); + hostdata->caps.migration.common.length = + cpu_to_be16(sizeof(hostdata->caps.migration)); + hostdata->caps.migration.common.server_support = + cpu_to_be16(SERVER_SUPPORTS_CAP); + hostdata->caps.migration.ecl = cpu_to_be32(1); + + if (client_reserve) { + hostdata->caps.reserve.common.cap_type = + cpu_to_be32(RESERVATION_CAPABILITIES); + hostdata->caps.reserve.common.length = + cpu_to_be16(sizeof(hostdata->caps.reserve)); + hostdata->caps.reserve.common.server_support = + cpu_to_be16(SERVER_SUPPORTS_CAP); + hostdata->caps.reserve.type = + cpu_to_be32(CLIENT_RESERVE_SCSI_2); + req->common.length = + cpu_to_be16(sizeof(hostdata->caps)); + } else + req->common.length = cpu_to_be16(sizeof(hostdata->caps) - + sizeof(hostdata->caps.reserve)); + + spin_lock_irqsave(hostdata->host->host_lock, flags); + if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) + dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); +}; + +/** + * fast_fail_rsp: - Handle response to MAD enable fast fail + * @evt_struct: srp_event_struct with the response + * + * Used as a "done" callback by when sending enable fast fail. Gets called + * by ibmvscsi_handle_crq() + */ +static void fast_fail_rsp(struct srp_event_struct *evt_struct) +{ + struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; + u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status); + + if (status == VIOSRP_MAD_NOT_SUPPORTED) + dev_err(hostdata->dev, "fast_fail not supported in server\n"); + else if (status == VIOSRP_MAD_FAILED) + dev_err(hostdata->dev, "fast_fail request failed\n"); + else if (status != VIOSRP_MAD_SUCCESS) + dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); + + send_mad_capabilities(hostdata); +} + +/** + * init_host - Start host initialization + * @hostdata: ibmvscsi_host_data of host + * + * Returns zero if successful. + */ +static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) +{ + int rc; + unsigned long flags; + struct viosrp_fast_fail *fast_fail_mad; + struct srp_event_struct *evt_struct; + + if (!fast_fail) { + send_mad_capabilities(hostdata); + return 0; + } + + evt_struct = get_event_struct(&hostdata->pool); + BUG_ON(!evt_struct); + + init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); + + fast_fail_mad = &evt_struct->iu.mad.fast_fail; + memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); + fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL); + fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad)); + + spin_lock_irqsave(hostdata->host->host_lock, flags); + rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + return rc; +} + +/** + * adapter_info_rsp: - Handle response to MAD adapter info request + * @evt_struct: srp_event_struct with the response + * + * Used as a "done" callback by when sending adapter_info. Gets called + * by ibmvscsi_handle_crq() +*/ +static void adapter_info_rsp(struct srp_event_struct *evt_struct) +{ + struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; + + if (evt_struct->xfer_iu->mad.adapter_info.common.status) { + dev_err(hostdata->dev, "error %d getting adapter info\n", + evt_struct->xfer_iu->mad.adapter_info.common.status); + } else { + dev_info(hostdata->dev, "host srp version: %s, " + "host partition %s (%d), OS %d, max io %u\n", + hostdata->madapter_info.srp_version, + hostdata->madapter_info.partition_name, + be32_to_cpu(hostdata->madapter_info.partition_number), + be32_to_cpu(hostdata->madapter_info.os_type), + be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); + + if (hostdata->madapter_info.port_max_txu[0]) + hostdata->host->max_sectors = + be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9; + + if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX && + strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { + dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", + hostdata->madapter_info.srp_version); + dev_err(hostdata->dev, "limiting scatterlists to %d\n", + MAX_INDIRECT_BUFS); + hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; + } + + if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) { + enable_fast_fail(hostdata); + return; + } + } + + send_srp_login(hostdata); +} + +/** + * send_mad_adapter_info: - Sends the mad adapter info request + * and stores the result so it can be retrieved with + * sysfs. We COULD consider causing a failure if the + * returned SRP version doesn't match ours. + * @hostdata: ibmvscsi_host_data of host + * + * Returns zero if successful. +*/ +static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) +{ + struct viosrp_adapter_info *req; + struct srp_event_struct *evt_struct; + unsigned long flags; + + evt_struct = get_event_struct(&hostdata->pool); + BUG_ON(!evt_struct); + + init_event_struct(evt_struct, + adapter_info_rsp, + VIOSRP_MAD_FORMAT, + info_timeout); + + req = &evt_struct->iu.mad.adapter_info; + memset(req, 0x00, sizeof(*req)); + + req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE); + req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info)); + req->buffer = cpu_to_be64(hostdata->adapter_info_addr); + + spin_lock_irqsave(hostdata->host->host_lock, flags); + if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) + dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); +}; + +/** + * init_adapter: Start virtual adapter initialization sequence + * + */ +static void init_adapter(struct ibmvscsi_host_data *hostdata) +{ + send_mad_adapter_info(hostdata); +} + +/** + * sync_completion: Signal that a synchronous command has completed + * Note that after returning from this call, the evt_struct is freed. + * the caller waiting on this completion shouldn't touch the evt_struct + * again. + */ +static void sync_completion(struct srp_event_struct *evt_struct) +{ + /* copy the response back */ + if (evt_struct->sync_srp) + *evt_struct->sync_srp = *evt_struct->xfer_iu; + + complete(&evt_struct->comp); +} + +/** + * ibmvscsi_abort: Abort a command...from scsi host template + * send this over to the server and wait synchronously for the response + */ +static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) +{ + struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); + struct srp_tsk_mgmt *tsk_mgmt; + struct srp_event_struct *evt; + struct srp_event_struct *tmp_evt, *found_evt; + union viosrp_iu srp_rsp; + int rsp_rc; + unsigned long flags; + u16 lun = lun_from_dev(cmd->device); + unsigned long wait_switch = 0; + + /* First, find this command in our sent list so we can figure + * out the correct tag + */ + spin_lock_irqsave(hostdata->host->host_lock, flags); + wait_switch = jiffies + (init_timeout * HZ); + do { + found_evt = NULL; + list_for_each_entry(tmp_evt, &hostdata->sent, list) { + if (tmp_evt->cmnd == cmd) { + found_evt = tmp_evt; + break; + } + } + + if (!found_evt) { + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + return SUCCESS; + } + + evt = get_event_struct(&hostdata->pool); + if (evt == NULL) { + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + sdev_printk(KERN_ERR, cmd->device, + "failed to allocate abort event\n"); + return FAILED; + } + + init_event_struct(evt, + sync_completion, + VIOSRP_SRP_FORMAT, + abort_timeout); + + tsk_mgmt = &evt->iu.srp.tsk_mgmt; + + /* Set up an abort SRP command */ + memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); + tsk_mgmt->opcode = SRP_TSK_MGMT; + int_to_scsilun(lun, &tsk_mgmt->lun); + tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; + tsk_mgmt->task_tag = (u64) found_evt; + + evt->sync_srp = &srp_rsp; + + init_completion(&evt->comp); + rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); + + if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) + break; + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + msleep(10); + spin_lock_irqsave(hostdata->host->host_lock, flags); + } while (time_before(jiffies, wait_switch)); + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, cmd->device, + "failed to send abort() event. rc=%d\n", rsp_rc); + return FAILED; + } + + sdev_printk(KERN_INFO, cmd->device, + "aborting command. lun 0x%llx, tag 0x%llx\n", + (((u64) lun) << 48), (u64) found_evt); + + wait_for_completion(&evt->comp); + + /* make sure we got a good response */ + if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { + if (printk_ratelimit()) + sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", + srp_rsp.srp.rsp.opcode); + return FAILED; + } + + if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) + rsp_rc = *((int *)srp_rsp.srp.rsp.data); + else + rsp_rc = srp_rsp.srp.rsp.status; + + if (rsp_rc) { + if (printk_ratelimit()) + sdev_printk(KERN_WARNING, cmd->device, + "abort code %d for task tag 0x%llx\n", + rsp_rc, tsk_mgmt->task_tag); + return FAILED; + } + + /* Because we dropped the spinlock above, it's possible + * The event is no longer in our list. Make sure it didn't + * complete while we were aborting + */ + spin_lock_irqsave(hostdata->host->host_lock, flags); + found_evt = NULL; + list_for_each_entry(tmp_evt, &hostdata->sent, list) { + if (tmp_evt->cmnd == cmd) { + found_evt = tmp_evt; + break; + } + } + + if (found_evt == NULL) { + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", + tsk_mgmt->task_tag); + return SUCCESS; + } + + sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", + tsk_mgmt->task_tag); + + cmd->result = (DID_ABORT << 16); + list_del(&found_evt->list); + unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, + found_evt->hostdata->dev); + free_event_struct(&found_evt->hostdata->pool, found_evt); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + atomic_inc(&hostdata->request_limit); + return SUCCESS; +} + +/** + * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host + * template send this over to the server and wait synchronously for the + * response + */ +static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) +{ + struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); + struct srp_tsk_mgmt *tsk_mgmt; + struct srp_event_struct *evt; + struct srp_event_struct *tmp_evt, *pos; + union viosrp_iu srp_rsp; + int rsp_rc; + unsigned long flags; + u16 lun = lun_from_dev(cmd->device); + unsigned long wait_switch = 0; + + spin_lock_irqsave(hostdata->host->host_lock, flags); + wait_switch = jiffies + (init_timeout * HZ); + do { + evt = get_event_struct(&hostdata->pool); + if (evt == NULL) { + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + sdev_printk(KERN_ERR, cmd->device, + "failed to allocate reset event\n"); + return FAILED; + } + + init_event_struct(evt, + sync_completion, + VIOSRP_SRP_FORMAT, + reset_timeout); + + tsk_mgmt = &evt->iu.srp.tsk_mgmt; + + /* Set up a lun reset SRP command */ + memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); + tsk_mgmt->opcode = SRP_TSK_MGMT; + int_to_scsilun(lun, &tsk_mgmt->lun); + tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; + + evt->sync_srp = &srp_rsp; + + init_completion(&evt->comp); + rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); + + if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) + break; + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + msleep(10); + spin_lock_irqsave(hostdata->host->host_lock, flags); + } while (time_before(jiffies, wait_switch)); + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + + if (rsp_rc != 0) { + sdev_printk(KERN_ERR, cmd->device, + "failed to send reset event. rc=%d\n", rsp_rc); + return FAILED; + } + + sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", + (((u64) lun) << 48)); + + wait_for_completion(&evt->comp); + + /* make sure we got a good response */ + if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { + if (printk_ratelimit()) + sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", + srp_rsp.srp.rsp.opcode); + return FAILED; + } + + if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) + rsp_rc = *((int *)srp_rsp.srp.rsp.data); + else + rsp_rc = srp_rsp.srp.rsp.status; + + if (rsp_rc) { + if (printk_ratelimit()) + sdev_printk(KERN_WARNING, cmd->device, + "reset code %d for task tag 0x%llx\n", + rsp_rc, tsk_mgmt->task_tag); + return FAILED; + } + + /* We need to find all commands for this LUN that have not yet been + * responded to, and fail them with DID_RESET + */ + spin_lock_irqsave(hostdata->host->host_lock, flags); + list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { + if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { + if (tmp_evt->cmnd) + tmp_evt->cmnd->result = (DID_RESET << 16); + list_del(&tmp_evt->list); + unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, + tmp_evt->hostdata->dev); + free_event_struct(&tmp_evt->hostdata->pool, + tmp_evt); + atomic_inc(&hostdata->request_limit); + if (tmp_evt->cmnd_done) + tmp_evt->cmnd_done(tmp_evt->cmnd); + else if (tmp_evt->done) + tmp_evt->done(tmp_evt); + } + } + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + return SUCCESS; +} + +/** + * ibmvscsi_eh_host_reset_handler - Reset the connection to the server + * @cmd: struct scsi_cmnd having problems +*/ +static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) +{ + unsigned long wait_switch = 0; + struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); + + dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); + + ibmvscsi_reset_host(hostdata); + + for (wait_switch = jiffies + (init_timeout * HZ); + time_before(jiffies, wait_switch) && + atomic_read(&hostdata->request_limit) < 2;) { + + msleep(10); + } + + if (atomic_read(&hostdata->request_limit) <= 0) + return FAILED; + + return SUCCESS; +} + +/** + * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ + * @crq: Command/Response queue + * @hostdata: ibmvscsi_host_data of host + * +*/ +static void ibmvscsi_handle_crq(struct viosrp_crq *crq, + struct ibmvscsi_host_data *hostdata) +{ + long rc; + unsigned long flags; + /* The hypervisor copies our tag value here so no byteswapping */ + struct srp_event_struct *evt_struct = + (__force struct srp_event_struct *)crq->IU_data_ptr; + switch (crq->valid) { + case VIOSRP_CRQ_INIT_RSP: /* initialization */ + switch (crq->format) { + case VIOSRP_CRQ_INIT: /* Initialization message */ + dev_info(hostdata->dev, "partner initialized\n"); + /* Send back a response */ + rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0); + if (rc == 0) { + /* Now login */ + init_adapter(hostdata); + } else { + dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); + } + + break; + case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */ + dev_info(hostdata->dev, "partner initialization complete\n"); + + /* Now login */ + init_adapter(hostdata); + break; + default: + dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); + } + return; + case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */ + scsi_block_requests(hostdata->host); + atomic_set(&hostdata->request_limit, 0); + if (crq->format == 0x06) { + /* We need to re-setup the interpartition connection */ + dev_info(hostdata->dev, "Re-enabling adapter!\n"); + hostdata->client_migrated = 1; + hostdata->reenable_crq = 1; + purge_requests(hostdata, DID_REQUEUE); + wake_up(&hostdata->work_wait_q); + } else { + dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", + crq->format); + ibmvscsi_reset_host(hostdata); + } + return; + case VIOSRP_CRQ_CMD_RSP: /* real payload */ + break; + default: + dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", + crq->valid); + return; + } + + /* The only kind of payload CRQs we should get are responses to + * things we send. Make sure this response is to something we + * actually sent + */ + if (!valid_event_struct(&hostdata->pool, evt_struct)) { + dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", + evt_struct); + return; + } + + if (atomic_read(&evt_struct->free)) { + dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", + evt_struct); + return; + } + + if (crq->format == VIOSRP_SRP_FORMAT) + atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta), + &hostdata->request_limit); + + del_timer(&evt_struct->timer); + + if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) + evt_struct->cmnd->result = DID_ERROR << 16; + if (evt_struct->done) + evt_struct->done(evt_struct); + else + dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); + + /* + * Lock the host_lock before messing with these structures, since we + * are running in a task context + */ + spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); + list_del(&evt_struct->list); + free_event_struct(&evt_struct->hostdata->pool, evt_struct); + spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); +} + +/** + * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. + * @sdev: struct scsi_device device to configure + * + * Enable allow_restart for a device if it is a disk. Adjust the + * queue_depth here also as is required by the documentation for + * struct scsi_host_template. + */ +static int ibmvscsi_slave_configure(struct scsi_device *sdev) +{ + struct Scsi_Host *shost = sdev->host; + unsigned long lock_flags = 0; + + spin_lock_irqsave(shost->host_lock, lock_flags); + if (sdev->type == TYPE_DISK) { + sdev->allow_restart = 1; + blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); + } + spin_unlock_irqrestore(shost->host_lock, lock_flags); + return 0; +} + +/** + * ibmvscsi_change_queue_depth - Change the device's queue depth + * @sdev: scsi device struct + * @qdepth: depth to set + * @reason: calling context + * + * Return value: + * actual depth set + **/ +static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) +{ + if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) + qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; + return scsi_change_queue_depth(sdev, qdepth); +} + +/* ------------------------------------------------------------ + * sysfs attributes + */ +static ssize_t show_host_vhost_loc(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvscsi_host_data *hostdata = shost_priv(shost); + int len; + + len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", + hostdata->caps.loc); + return len; +} + +static struct device_attribute ibmvscsi_host_vhost_loc = { + .attr = { + .name = "vhost_loc", + .mode = S_IRUGO, + }, + .show = show_host_vhost_loc, +}; + +static ssize_t show_host_vhost_name(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvscsi_host_data *hostdata = shost_priv(shost); + int len; + + len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", + hostdata->caps.name); + return len; +} + +static struct device_attribute ibmvscsi_host_vhost_name = { + .attr = { + .name = "vhost_name", + .mode = S_IRUGO, + }, + .show = show_host_vhost_name, +}; + +static ssize_t show_host_srp_version(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvscsi_host_data *hostdata = shost_priv(shost); + int len; + + len = snprintf(buf, PAGE_SIZE, "%s\n", + hostdata->madapter_info.srp_version); + return len; +} + +static struct device_attribute ibmvscsi_host_srp_version = { + .attr = { + .name = "srp_version", + .mode = S_IRUGO, + }, + .show = show_host_srp_version, +}; + +static ssize_t show_host_partition_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvscsi_host_data *hostdata = shost_priv(shost); + int len; + + len = snprintf(buf, PAGE_SIZE, "%s\n", + hostdata->madapter_info.partition_name); + return len; +} + +static struct device_attribute ibmvscsi_host_partition_name = { + .attr = { + .name = "partition_name", + .mode = S_IRUGO, + }, + .show = show_host_partition_name, +}; + +static ssize_t show_host_partition_number(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvscsi_host_data *hostdata = shost_priv(shost); + int len; + + len = snprintf(buf, PAGE_SIZE, "%d\n", + be32_to_cpu(hostdata->madapter_info.partition_number)); + return len; +} + +static struct device_attribute ibmvscsi_host_partition_number = { + .attr = { + .name = "partition_number", + .mode = S_IRUGO, + }, + .show = show_host_partition_number, +}; + +static ssize_t show_host_mad_version(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvscsi_host_data *hostdata = shost_priv(shost); + int len; + + len = snprintf(buf, PAGE_SIZE, "%d\n", + be32_to_cpu(hostdata->madapter_info.mad_version)); + return len; +} + +static struct device_attribute ibmvscsi_host_mad_version = { + .attr = { + .name = "mad_version", + .mode = S_IRUGO, + }, + .show = show_host_mad_version, +}; + +static ssize_t show_host_os_type(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct ibmvscsi_host_data *hostdata = shost_priv(shost); + int len; + + len = snprintf(buf, PAGE_SIZE, "%d\n", + be32_to_cpu(hostdata->madapter_info.os_type)); + return len; +} + +static struct device_attribute ibmvscsi_host_os_type = { + .attr = { + .name = "os_type", + .mode = S_IRUGO, + }, + .show = show_host_os_type, +}; + +static ssize_t show_host_config(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return 0; +} + +static struct device_attribute ibmvscsi_host_config = { + .attr = { + .name = "config", + .mode = S_IRUGO, + }, + .show = show_host_config, +}; + +static struct device_attribute *ibmvscsi_attrs[] = { + &ibmvscsi_host_vhost_loc, + &ibmvscsi_host_vhost_name, + &ibmvscsi_host_srp_version, + &ibmvscsi_host_partition_name, + &ibmvscsi_host_partition_number, + &ibmvscsi_host_mad_version, + &ibmvscsi_host_os_type, + &ibmvscsi_host_config, + NULL +}; + +/* ------------------------------------------------------------ + * SCSI driver registration + */ +static struct scsi_host_template driver_template = { + .module = THIS_MODULE, + .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, + .proc_name = "ibmvscsi", + .queuecommand = ibmvscsi_queuecommand, + .eh_timed_out = srp_timed_out, + .eh_abort_handler = ibmvscsi_eh_abort_handler, + .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, + .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, + .slave_configure = ibmvscsi_slave_configure, + .change_queue_depth = ibmvscsi_change_queue_depth, + .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, + .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, + .this_id = -1, + .sg_tablesize = SG_ALL, + .use_clustering = ENABLE_CLUSTERING, + .shost_attrs = ibmvscsi_attrs, +}; + +/** + * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver + * + * @vdev: struct vio_dev for the device whose desired IO mem is to be returned + * + * Return value: + * Number of bytes of IO data the driver will need to perform well. + */ +static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) +{ + /* iu_storage data allocated in initialize_event_pool */ + unsigned long desired_io = max_events * sizeof(union viosrp_iu); + + /* add io space for sg data */ + desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * + IBMVSCSI_CMDS_PER_LUN_DEFAULT); + + return desired_io; +} + +static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) +{ + int rc; + char *action = "reset"; + + if (hostdata->reset_crq) { + smp_rmb(); + hostdata->reset_crq = 0; + + rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); + if (!rc) + rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); + vio_enable_interrupts(to_vio_dev(hostdata->dev)); + } else if (hostdata->reenable_crq) { + smp_rmb(); + action = "enable"; + rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); + hostdata->reenable_crq = 0; + if (!rc) + rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); + } else + return; + + if (rc) { + atomic_set(&hostdata->request_limit, -1); + dev_err(hostdata->dev, "error after %s\n", action); + } + + scsi_unblock_requests(hostdata->host); +} + +static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) +{ + if (kthread_should_stop()) + return 1; + else if (hostdata->reset_crq) { + smp_rmb(); + return 1; + } else if (hostdata->reenable_crq) { + smp_rmb(); + return 1; + } + + return 0; +} + +static int ibmvscsi_work(void *data) +{ + struct ibmvscsi_host_data *hostdata = data; + int rc; + + set_user_nice(current, MIN_NICE); + + while (1) { + rc = wait_event_interruptible(hostdata->work_wait_q, + ibmvscsi_work_to_do(hostdata)); + + BUG_ON(rc); + + if (kthread_should_stop()) + break; + + ibmvscsi_do_work(hostdata); + } + + return 0; +} + +/** + * Called by bus code for each adapter + */ +static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) +{ + struct ibmvscsi_host_data *hostdata; + struct Scsi_Host *host; + struct device *dev = &vdev->dev; + struct srp_rport_identifiers ids; + struct srp_rport *rport; + unsigned long wait_switch = 0; + int rc; + + dev_set_drvdata(&vdev->dev, NULL); + + host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); + if (!host) { + dev_err(&vdev->dev, "couldn't allocate host data\n"); + goto scsi_host_alloc_failed; + } + + host->transportt = ibmvscsi_transport_template; + hostdata = shost_priv(host); + memset(hostdata, 0x00, sizeof(*hostdata)); + INIT_LIST_HEAD(&hostdata->sent); + init_waitqueue_head(&hostdata->work_wait_q); + hostdata->host = host; + hostdata->dev = dev; + atomic_set(&hostdata->request_limit, -1); + hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; + + if (map_persist_bufs(hostdata)) { + dev_err(&vdev->dev, "couldn't map persistent buffers\n"); + goto persist_bufs_failed; + } + + hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", + "ibmvscsi", host->host_no); + + if (IS_ERR(hostdata->work_thread)) { + dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", + PTR_ERR(hostdata->work_thread)); + goto init_crq_failed; + } + + rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events); + if (rc != 0 && rc != H_RESOURCE) { + dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); + goto kill_kthread; + } + if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { + dev_err(&vdev->dev, "couldn't initialize event pool\n"); + goto init_pool_failed; + } + + host->max_lun = IBMVSCSI_MAX_LUN; + host->max_id = max_id; + host->max_channel = max_channel; + host->max_cmd_len = 16; + + dev_info(dev, + "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n", + host->max_id, host->max_lun, host->max_channel); + + if (scsi_add_host(hostdata->host, hostdata->dev)) + goto add_host_failed; + + /* we don't have a proper target_port_id so let's use the fake one */ + memcpy(ids.port_id, hostdata->madapter_info.partition_name, + sizeof(ids.port_id)); + ids.roles = SRP_RPORT_ROLE_TARGET; + rport = srp_rport_add(host, &ids); + if (IS_ERR(rport)) + goto add_srp_port_failed; + + /* Try to send an initialization message. Note that this is allowed + * to fail if the other end is not acive. In that case we don't + * want to scan + */ + if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 + || rc == H_RESOURCE) { + /* + * Wait around max init_timeout secs for the adapter to finish + * initializing. When we are done initializing, we will have a + * valid request_limit. We don't want Linux scanning before + * we are ready. + */ + for (wait_switch = jiffies + (init_timeout * HZ); + time_before(jiffies, wait_switch) && + atomic_read(&hostdata->request_limit) < 2;) { + + msleep(10); + } + + /* if we now have a valid request_limit, initiate a scan */ + if (atomic_read(&hostdata->request_limit) > 0) + scsi_scan_host(host); + } + + dev_set_drvdata(&vdev->dev, hostdata); + spin_lock(&ibmvscsi_driver_lock); + list_add_tail(&hostdata->host_list, &ibmvscsi_head); + spin_unlock(&ibmvscsi_driver_lock); + return 0; + + add_srp_port_failed: + scsi_remove_host(hostdata->host); + add_host_failed: + release_event_pool(&hostdata->pool, hostdata); + init_pool_failed: + ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); + kill_kthread: + kthread_stop(hostdata->work_thread); + init_crq_failed: + unmap_persist_bufs(hostdata); + persist_bufs_failed: + scsi_host_put(host); + scsi_host_alloc_failed: + return -1; +} + +static int ibmvscsi_remove(struct vio_dev *vdev) +{ + struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); + + srp_remove_host(hostdata->host); + scsi_remove_host(hostdata->host); + + purge_requests(hostdata, DID_ERROR); + release_event_pool(&hostdata->pool, hostdata); + + ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, + max_events); + + kthread_stop(hostdata->work_thread); + unmap_persist_bufs(hostdata); + + spin_lock(&ibmvscsi_driver_lock); + list_del(&hostdata->host_list); + spin_unlock(&ibmvscsi_driver_lock); + + scsi_host_put(hostdata->host); + + return 0; +} + +/** + * ibmvscsi_resume: Resume from suspend + * @dev: device struct + * + * We may have lost an interrupt across suspend/resume, so kick the + * interrupt handler + */ +static int ibmvscsi_resume(struct device *dev) +{ + struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); + vio_disable_interrupts(to_vio_dev(hostdata->dev)); + tasklet_schedule(&hostdata->srp_task); + + return 0; +} + +/** + * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we + * support. + */ +static const struct vio_device_id ibmvscsi_device_table[] = { + {"vscsi", "IBM,v-scsi"}, + { "", "" } +}; +MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); + +static const struct dev_pm_ops ibmvscsi_pm_ops = { + .resume = ibmvscsi_resume +}; + +static struct vio_driver ibmvscsi_driver = { + .id_table = ibmvscsi_device_table, + .probe = ibmvscsi_probe, + .remove = ibmvscsi_remove, + .get_desired_dma = ibmvscsi_get_desired_dma, + .name = "ibmvscsi", + .pm = &ibmvscsi_pm_ops, +}; + +static struct srp_function_template ibmvscsi_transport_functions = { +}; + +int __init ibmvscsi_module_init(void) +{ + int ret; + + /* Ensure we have two requests to do error recovery */ + driver_template.can_queue = max_requests; + max_events = max_requests + 2; + + if (!firmware_has_feature(FW_FEATURE_VIO)) + return -ENODEV; + + ibmvscsi_transport_template = + srp_attach_transport(&ibmvscsi_transport_functions); + if (!ibmvscsi_transport_template) + return -ENOMEM; + + ret = vio_register_driver(&ibmvscsi_driver); + if (ret) + srp_release_transport(ibmvscsi_transport_template); + return ret; +} + +void __exit ibmvscsi_module_exit(void) +{ + vio_unregister_driver(&ibmvscsi_driver); + srp_release_transport(ibmvscsi_transport_template); +} + +module_init(ibmvscsi_module_init); +module_exit(ibmvscsi_module_exit); diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h new file mode 100644 index 000000000..3a7875575 --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvscsi.h @@ -0,0 +1,112 @@ +/* ------------------------------------------------------------ + * ibmvscsi.h + * (C) Copyright IBM Corporation 1994, 2003 + * Authors: Colin DeVilbiss (devilbis@us.ibm.com) + * Santiago Leon (santil@us.ibm.com) + * Dave Boutcher (sleddog@us.ibm.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + * USA + * + * ------------------------------------------------------------ + * Emulation of a SCSI host adapter for Virtual I/O devices + * + * This driver allows the Linux SCSI peripheral drivers to directly + * access devices in the hosting partition, either on an iSeries + * hypervisor system or a converged hypervisor system. + */ +#ifndef IBMVSCSI_H +#define IBMVSCSI_H +#include <linux/types.h> +#include <linux/list.h> +#include <linux/completion.h> +#include <linux/interrupt.h> +#include <scsi/viosrp.h> + +struct scsi_cmnd; +struct Scsi_Host; + +/* Number of indirect bufs...the list of these has to fit in the + * additional data of the srp_cmd struct along with the indirect + * descriptor + */ +#define MAX_INDIRECT_BUFS 10 + +#define IBMVSCSI_MAX_REQUESTS_DEFAULT 100 +#define IBMVSCSI_CMDS_PER_LUN_DEFAULT 16 +#define IBMVSCSI_MAX_SECTORS_DEFAULT 256 /* 32 * 8 = default max I/O 32 pages */ +#define IBMVSCSI_MAX_CMDS_PER_LUN 64 +#define IBMVSCSI_MAX_LUN 32 + +/* ------------------------------------------------------------ + * Data Structures + */ +/* an RPA command/response transport queue */ +struct crq_queue { + struct viosrp_crq *msgs; + int size, cur; + dma_addr_t msg_token; + spinlock_t lock; +}; + +/* a unit of work for the hosting partition */ +struct srp_event_struct { + union viosrp_iu *xfer_iu; + struct scsi_cmnd *cmnd; + struct list_head list; + void (*done) (struct srp_event_struct *); + struct viosrp_crq crq; + struct ibmvscsi_host_data *hostdata; + atomic_t free; + union viosrp_iu iu; + void (*cmnd_done) (struct scsi_cmnd *); + struct completion comp; + struct timer_list timer; + union viosrp_iu *sync_srp; + struct srp_direct_buf *ext_list; + dma_addr_t ext_list_token; +}; + +/* a pool of event structs for use */ +struct event_pool { + struct srp_event_struct *events; + u32 size; + int next; + union viosrp_iu *iu_storage; + dma_addr_t iu_token; +}; + +/* all driver data associated with a host adapter */ +struct ibmvscsi_host_data { + struct list_head host_list; + atomic_t request_limit; + int client_migrated; + int reset_crq; + int reenable_crq; + struct device *dev; + struct event_pool pool; + struct crq_queue queue; + struct tasklet_struct srp_task; + struct list_head sent; + struct Scsi_Host *host; + struct task_struct *work_thread; + wait_queue_head_t work_wait_q; + struct mad_adapter_info_data madapter_info; + struct capabilities caps; + dma_addr_t caps_addr; + dma_addr_t adapter_info_addr; +}; + +#endif /* IBMVSCSI_H */ |