diff options
Diffstat (limited to 'drivers/scsi/libsas/sas_host_smp.c')
| -rw-r--r-- | drivers/scsi/libsas/sas_host_smp.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c new file mode 100644 index 000000000..9ead93df3 --- /dev/null +++ b/drivers/scsi/libsas/sas_host_smp.c @@ -0,0 +1,357 @@ +/* + * Serial Attached SCSI (SAS) Expander discovery and configuration + * + * Copyright (C) 2007 James E.J. Bottomley + * <James.Bottomley@HansenPartnership.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; version 2 only. + */ +#include <linux/scatterlist.h> +#include <linux/blkdev.h> +#include <linux/slab.h> +#include <linux/export.h> + +#include "sas_internal.h" + +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_sas.h> +#include "../scsi_sas_internal.h" + +static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data, + u8 phy_id) +{ + struct sas_phy *phy; + struct sas_rphy *rphy; + + if (phy_id >= sas_ha->num_phys) { + resp_data[2] = SMP_RESP_NO_PHY; + return; + } + resp_data[2] = SMP_RESP_FUNC_ACC; + + phy = sas_ha->sas_phy[phy_id]->phy; + resp_data[9] = phy_id; + resp_data[13] = phy->negotiated_linkrate; + memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE); + memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr, + SAS_ADDR_SIZE); + resp_data[40] = (phy->minimum_linkrate << 4) | + phy->minimum_linkrate_hw; + resp_data[41] = (phy->maximum_linkrate << 4) | + phy->maximum_linkrate_hw; + + if (!sas_ha->sas_phy[phy_id]->port || + !sas_ha->sas_phy[phy_id]->port->port_dev) + return; + + rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; + resp_data[12] = rphy->identify.device_type << 4; + resp_data[14] = rphy->identify.initiator_port_protocols; + resp_data[15] = rphy->identify.target_port_protocols; +} + +/** + * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od' + * @od: od bit to find + * @data: incoming bitstream (from frame) + * @index: requested data register index (from frame) + * @count: total number of registers in the bitstream (from frame) + * @bit: bit position of 'od' in the returned byte + * + * returns NULL if 'od' is not in 'data' + * + * From SFF-8485 v0.7: + * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0) + * and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1). + * + * In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2) + * and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)." + * + * The general-purpose (raw-bitstream) RX registers have the same layout + * although 'od' is renamed 'id' for 'input data'. + * + * SFF-8489 defines the behavior of the LEDs in response to the 'od' values. + */ +static u8 *to_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count, u8 *bit) +{ + unsigned int reg; + u8 byte; + + /* gp registers start at index 1 */ + if (index == 0) + return NULL; + + index--; /* make index 0-based */ + if (od < index * 32) + return NULL; + + od -= index * 32; + reg = od >> 5; + + if (reg >= count) + return NULL; + + od &= (1 << 5) - 1; + byte = 3 - (od >> 3); + *bit = od & ((1 << 3) - 1); + + return &data[reg * 4 + byte]; +} + +int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count) +{ + u8 *byte; + u8 bit; + + byte = to_sas_gpio_gp_bit(od, data, index, count, &bit); + if (!byte) + return -1; + + return (*byte >> bit) & 1; +} +EXPORT_SYMBOL(try_test_sas_gpio_gp_bit); + +static int sas_host_smp_write_gpio(struct sas_ha_struct *sas_ha, u8 *resp_data, + u8 reg_type, u8 reg_index, u8 reg_count, + u8 *req_data) +{ + struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt); + int written; + + if (i->dft->lldd_write_gpio == NULL) { + resp_data[2] = SMP_RESP_FUNC_UNK; + return 0; + } + + written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index, + reg_count, req_data); + + if (written < 0) { + resp_data[2] = SMP_RESP_FUNC_FAILED; + written = 0; + } else + resp_data[2] = SMP_RESP_FUNC_ACC; + + return written; +} + +static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data, + u8 phy_id) +{ + struct sas_rphy *rphy; + struct dev_to_host_fis *fis; + int i; + + if (phy_id >= sas_ha->num_phys) { + resp_data[2] = SMP_RESP_NO_PHY; + return; + } + + resp_data[2] = SMP_RESP_PHY_NO_SATA; + + if (!sas_ha->sas_phy[phy_id]->port) + return; + + rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; + fis = (struct dev_to_host_fis *) + sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd; + if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA) + return; + + resp_data[2] = SMP_RESP_FUNC_ACC; + resp_data[9] = phy_id; + memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr, + SAS_ADDR_SIZE); + + /* check to see if we have a valid d2h fis */ + if (fis->fis_type != 0x34) + return; + + /* the d2h fis is required by the standard to be in LE format */ + for (i = 0; i < 20; i += 4) { + u8 *dst = resp_data + 24 + i, *src = + &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i]; + dst[0] = src[3]; + dst[1] = src[2]; + dst[2] = src[1]; + dst[3] = src[0]; + } +} + +static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id, + u8 phy_op, enum sas_linkrate min, + enum sas_linkrate max, u8 *resp_data) +{ + struct sas_internal *i = + to_sas_internal(sas_ha->core.shost->transportt); + struct sas_phy_linkrates rates; + struct asd_sas_phy *asd_phy; + + if (phy_id >= sas_ha->num_phys) { + resp_data[2] = SMP_RESP_NO_PHY; + return; + } + + asd_phy = sas_ha->sas_phy[phy_id]; + switch (phy_op) { + case PHY_FUNC_NOP: + case PHY_FUNC_LINK_RESET: + case PHY_FUNC_HARD_RESET: + case PHY_FUNC_DISABLE: + case PHY_FUNC_CLEAR_ERROR_LOG: + case PHY_FUNC_CLEAR_AFFIL: + case PHY_FUNC_TX_SATA_PS_SIGNAL: + break; + + default: + resp_data[2] = SMP_RESP_PHY_UNK_OP; + return; + } + + rates.minimum_linkrate = min; + rates.maximum_linkrate = max; + + /* filter reset requests through libata eh */ + if (phy_op == PHY_FUNC_LINK_RESET && sas_try_ata_reset(asd_phy) == 0) { + resp_data[2] = SMP_RESP_FUNC_ACC; + return; + } + + if (i->dft->lldd_control_phy(asd_phy, phy_op, &rates)) + resp_data[2] = SMP_RESP_FUNC_FAILED; + else + resp_data[2] = SMP_RESP_FUNC_ACC; +} + +void sas_smp_host_handler(struct bsg_job *job, struct Scsi_Host *shost) +{ + struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); + u8 *req_data, *resp_data; + unsigned int reslen = 0; + int error = -EINVAL; + + /* eight is the minimum size for request and response frames */ + if (job->request_payload.payload_len < 8 || + job->reply_payload.payload_len < 8) + goto out; + + error = -ENOMEM; + req_data = kzalloc(job->request_payload.payload_len, GFP_KERNEL); + if (!req_data) + goto out; + sg_copy_to_buffer(job->request_payload.sg_list, + job->request_payload.sg_cnt, req_data, + job->request_payload.payload_len); + + /* make sure frame can always be built ... we copy + * back only the requested length */ + resp_data = kzalloc(max(job->reply_payload.payload_len, 128U), + GFP_KERNEL); + if (!resp_data) + goto out_free_req; + + error = -EINVAL; + if (req_data[0] != SMP_REQUEST) + goto out_free_resp; + + /* set up default don't know response */ + resp_data[0] = SMP_RESPONSE; + resp_data[1] = req_data[1]; + resp_data[2] = SMP_RESP_FUNC_UNK; + + switch (req_data[1]) { + case SMP_REPORT_GENERAL: + resp_data[2] = SMP_RESP_FUNC_ACC; + resp_data[9] = sas_ha->num_phys; + reslen = 32; + break; + + case SMP_REPORT_MANUF_INFO: + resp_data[2] = SMP_RESP_FUNC_ACC; + memcpy(resp_data + 12, shost->hostt->name, + SAS_EXPANDER_VENDOR_ID_LEN); + memcpy(resp_data + 20, "libsas virt phy", + SAS_EXPANDER_PRODUCT_ID_LEN); + reslen = 64; + break; + + case SMP_READ_GPIO_REG: + /* FIXME: need GPIO support in the transport class */ + break; + + case SMP_DISCOVER: + if (job->request_payload.payload_len < 16) + goto out_free_resp; + sas_host_smp_discover(sas_ha, resp_data, req_data[9]); + reslen = 56; + break; + + case SMP_REPORT_PHY_ERR_LOG: + /* FIXME: could implement this with additional + * libsas callbacks providing the HW supports it */ + break; + + case SMP_REPORT_PHY_SATA: + if (job->request_payload.payload_len < 16) + goto out_free_resp; + sas_report_phy_sata(sas_ha, resp_data, req_data[9]); + reslen = 60; + break; + + case SMP_REPORT_ROUTE_INFO: + /* Can't implement; hosts have no routes */ + break; + + case SMP_WRITE_GPIO_REG: { + /* SFF-8485 v0.7 */ + const int base_frame_size = 11; + int to_write = req_data[4]; + + if (job->request_payload.payload_len < + base_frame_size + to_write * 4) { + resp_data[2] = SMP_RESP_INV_FRM_LEN; + break; + } + + to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2], + req_data[3], to_write, &req_data[8]); + reslen = 8; + break; + } + + case SMP_CONF_ROUTE_INFO: + /* Can't implement; hosts have no routes */ + break; + + case SMP_PHY_CONTROL: + if (job->request_payload.payload_len < 44) + goto out_free_resp; + sas_phy_control(sas_ha, req_data[9], req_data[10], + req_data[32] >> 4, req_data[33] >> 4, + resp_data); + reslen = 8; + break; + + case SMP_PHY_TEST_FUNCTION: + /* FIXME: should this be implemented? */ + break; + + default: + /* probably a 2.0 function */ + break; + } + + sg_copy_from_buffer(job->reply_payload.sg_list, + job->reply_payload.sg_cnt, resp_data, + job->reply_payload.payload_len); + + error = 0; +out_free_resp: + kfree(resp_data); +out_free_req: + kfree(req_data); +out: + bsg_job_done(job, error, reslen); +} |