diff options
Diffstat (limited to 'drivers/scsi/esas2r/esas2r_disc.c')
| -rw-r--r-- | drivers/scsi/esas2r/esas2r_disc.c | 1184 |
1 files changed, 1184 insertions, 0 deletions
diff --git a/drivers/scsi/esas2r/esas2r_disc.c b/drivers/scsi/esas2r/esas2r_disc.c new file mode 100644 index 000000000..1c079f430 --- /dev/null +++ b/drivers/scsi/esas2r/esas2r_disc.c @@ -0,0 +1,1184 @@ +/* + * linux/drivers/scsi/esas2r/esas2r_disc.c + * esas2r device discovery routines + * + * Copyright (c) 2001-2013 ATTO Technology, Inc. + * (mailto:linuxdrivers@attotech.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 of the License. + * + * 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. + * + * NO WARRANTY + * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR + * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT + * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is + * solely responsible for determining the appropriateness of using and + * distributing the Program and assumes all risks associated with its + * exercise of rights under this Agreement, including but not limited to + * the risks and costs of program errors, damage to or loss of data, + * programs or equipment, and unavailability or interruption of operations. + * + * DISCLAIMER OF LIABILITY + * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE + * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED + * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES + * + * 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 "esas2r.h" + +/* Miscellaneous internal discovery routines */ +static void esas2r_disc_abort(struct esas2r_adapter *a, + struct esas2r_request *rq); +static bool esas2r_disc_continue(struct esas2r_adapter *a, + struct esas2r_request *rq); +static void esas2r_disc_fix_curr_requests(struct esas2r_adapter *a); +static u32 esas2r_disc_get_phys_addr(struct esas2r_sg_context *sgc, u64 *addr); +static bool esas2r_disc_start_request(struct esas2r_adapter *a, + struct esas2r_request *rq); + +/* Internal discovery routines that process the states */ +static bool esas2r_disc_block_dev_scan(struct esas2r_adapter *a, + struct esas2r_request *rq); +static void esas2r_disc_block_dev_scan_cb(struct esas2r_adapter *a, + struct esas2r_request *rq); +static bool esas2r_disc_dev_add(struct esas2r_adapter *a, + struct esas2r_request *rq); +static bool esas2r_disc_dev_remove(struct esas2r_adapter *a, + struct esas2r_request *rq); +static bool esas2r_disc_part_info(struct esas2r_adapter *a, + struct esas2r_request *rq); +static void esas2r_disc_part_info_cb(struct esas2r_adapter *a, + struct esas2r_request *rq); +static bool esas2r_disc_passthru_dev_info(struct esas2r_adapter *a, + struct esas2r_request *rq); +static void esas2r_disc_passthru_dev_info_cb(struct esas2r_adapter *a, + struct esas2r_request *rq); +static bool esas2r_disc_passthru_dev_addr(struct esas2r_adapter *a, + struct esas2r_request *rq); +static void esas2r_disc_passthru_dev_addr_cb(struct esas2r_adapter *a, + struct esas2r_request *rq); +static bool esas2r_disc_raid_grp_info(struct esas2r_adapter *a, + struct esas2r_request *rq); +static void esas2r_disc_raid_grp_info_cb(struct esas2r_adapter *a, + struct esas2r_request *rq); + +void esas2r_disc_initialize(struct esas2r_adapter *a) +{ + struct esas2r_sas_nvram *nvr = a->nvram; + + esas2r_trace_enter(); + + clear_bit(AF_DISC_IN_PROG, &a->flags); + clear_bit(AF2_DEV_SCAN, &a->flags2); + clear_bit(AF2_DEV_CNT_OK, &a->flags2); + + a->disc_start_time = jiffies_to_msecs(jiffies); + a->disc_wait_time = nvr->dev_wait_time * 1000; + a->disc_wait_cnt = nvr->dev_wait_count; + + if (a->disc_wait_cnt > ESAS2R_MAX_TARGETS) + a->disc_wait_cnt = ESAS2R_MAX_TARGETS; + + /* + * If we are doing chip reset or power management processing, always + * wait for devices. use the NVRAM device count if it is greater than + * previously discovered devices. + */ + + esas2r_hdebug("starting discovery..."); + + a->general_req.interrupt_cx = NULL; + + if (test_bit(AF_CHPRST_DETECTED, &a->flags) || + test_bit(AF_POWER_MGT, &a->flags)) { + if (a->prev_dev_cnt == 0) { + /* Don't bother waiting if there is nothing to wait + * for. + */ + a->disc_wait_time = 0; + } else { + /* + * Set the device wait count to what was previously + * found. We don't care if the user only configured + * a time because we know the exact count to wait for. + * There is no need to honor the user's wishes to + * always wait the full time. + */ + a->disc_wait_cnt = a->prev_dev_cnt; + + /* + * bump the minimum wait time to 15 seconds since the + * default is 3 (system boot or the boot driver usually + * buys us more time). + */ + if (a->disc_wait_time < 15000) + a->disc_wait_time = 15000; + } + } + + esas2r_trace("disc wait count: %d", a->disc_wait_cnt); + esas2r_trace("disc wait time: %d", a->disc_wait_time); + + if (a->disc_wait_time == 0) + esas2r_disc_check_complete(a); + + esas2r_trace_exit(); +} + +void esas2r_disc_start_waiting(struct esas2r_adapter *a) +{ + unsigned long flags; + + spin_lock_irqsave(&a->mem_lock, flags); + + if (a->disc_ctx.disc_evt) + esas2r_disc_start_port(a); + + spin_unlock_irqrestore(&a->mem_lock, flags); +} + +void esas2r_disc_check_for_work(struct esas2r_adapter *a) +{ + struct esas2r_request *rq = &a->general_req; + + /* service any pending interrupts first */ + + esas2r_polled_interrupt(a); + + /* + * now, interrupt processing may have queued up a discovery event. go + * see if we have one to start. we couldn't start it in the ISR since + * polled discovery would cause a deadlock. + */ + + esas2r_disc_start_waiting(a); + + if (rq->interrupt_cx == NULL) + return; + + if (rq->req_stat == RS_STARTED + && rq->timeout <= RQ_MAX_TIMEOUT) { + /* wait for the current discovery request to complete. */ + esas2r_wait_request(a, rq); + + if (rq->req_stat == RS_TIMEOUT) { + esas2r_disc_abort(a, rq); + esas2r_local_reset_adapter(a); + return; + } + } + + if (rq->req_stat == RS_PENDING + || rq->req_stat == RS_STARTED) + return; + + esas2r_disc_continue(a, rq); +} + +void esas2r_disc_check_complete(struct esas2r_adapter *a) +{ + unsigned long flags; + + esas2r_trace_enter(); + + /* check to see if we should be waiting for devices */ + if (a->disc_wait_time) { + u32 currtime = jiffies_to_msecs(jiffies); + u32 time = currtime - a->disc_start_time; + + /* + * Wait until the device wait time is exhausted or the device + * wait count is satisfied. + */ + if (time < a->disc_wait_time + && (esas2r_targ_db_get_tgt_cnt(a) < a->disc_wait_cnt + || a->disc_wait_cnt == 0)) { + /* After three seconds of waiting, schedule a scan. */ + if (time >= 3000 + && !test_and_set_bit(AF2_DEV_SCAN, &a->flags2)) { + spin_lock_irqsave(&a->mem_lock, flags); + esas2r_disc_queue_event(a, DCDE_DEV_SCAN); + spin_unlock_irqrestore(&a->mem_lock, flags); + } + + esas2r_trace_exit(); + return; + } + + /* + * We are done waiting...we think. Adjust the wait time to + * consume events after the count is met. + */ + if (!test_and_set_bit(AF2_DEV_CNT_OK, &a->flags2)) + a->disc_wait_time = time + 3000; + + /* If we haven't done a full scan yet, do it now. */ + if (!test_and_set_bit(AF2_DEV_SCAN, &a->flags2)) { + spin_lock_irqsave(&a->mem_lock, flags); + esas2r_disc_queue_event(a, DCDE_DEV_SCAN); + spin_unlock_irqrestore(&a->mem_lock, flags); + esas2r_trace_exit(); + return; + } + + /* + * Now, if there is still time left to consume events, continue + * waiting. + */ + if (time < a->disc_wait_time) { + esas2r_trace_exit(); + return; + } + } else { + if (!test_and_set_bit(AF2_DEV_SCAN, &a->flags2)) { + spin_lock_irqsave(&a->mem_lock, flags); + esas2r_disc_queue_event(a, DCDE_DEV_SCAN); + spin_unlock_irqrestore(&a->mem_lock, flags); + } + } + + /* We want to stop waiting for devices. */ + a->disc_wait_time = 0; + + if (test_bit(AF_DISC_POLLED, &a->flags) && + test_bit(AF_DISC_IN_PROG, &a->flags)) { + /* + * Polled discovery is still pending so continue the active + * discovery until it is done. At that point, we will stop + * polled discovery and transition to interrupt driven + * discovery. + */ + } else { + /* + * Done waiting for devices. Note that we get here immediately + * after deferred waiting completes because that is interrupt + * driven; i.e. There is no transition. + */ + esas2r_disc_fix_curr_requests(a); + clear_bit(AF_DISC_PENDING, &a->flags); + + /* + * We have deferred target state changes until now because we + * don't want to report any removals (due to the first arrival) + * until the device wait time expires. + */ + set_bit(AF_PORT_CHANGE, &a->flags); + } + + esas2r_trace_exit(); +} + +void esas2r_disc_queue_event(struct esas2r_adapter *a, u8 disc_evt) +{ + struct esas2r_disc_context *dc = &a->disc_ctx; + + esas2r_trace_enter(); + + esas2r_trace("disc_event: %d", disc_evt); + + /* Initialize the discovery context */ + dc->disc_evt |= disc_evt; + + /* + * Don't start discovery before or during polled discovery. if we did, + * we would have a deadlock if we are in the ISR already. + */ + if (!test_bit(AF_CHPRST_PENDING, &a->flags) && + !test_bit(AF_DISC_POLLED, &a->flags)) + esas2r_disc_start_port(a); + + esas2r_trace_exit(); +} + +bool esas2r_disc_start_port(struct esas2r_adapter *a) +{ + struct esas2r_request *rq = &a->general_req; + struct esas2r_disc_context *dc = &a->disc_ctx; + bool ret; + + esas2r_trace_enter(); + + if (test_bit(AF_DISC_IN_PROG, &a->flags)) { + esas2r_trace_exit(); + + return false; + } + + /* If there is a discovery waiting, process it. */ + if (dc->disc_evt) { + if (test_bit(AF_DISC_POLLED, &a->flags) + && a->disc_wait_time == 0) { + /* + * We are doing polled discovery, but we no longer want + * to wait for devices. Stop polled discovery and + * transition to interrupt driven discovery. + */ + + esas2r_trace_exit(); + + return false; + } + } else { + /* Discovery is complete. */ + + esas2r_hdebug("disc done"); + + set_bit(AF_PORT_CHANGE, &a->flags); + + esas2r_trace_exit(); + + return false; + } + + /* Handle the discovery context */ + esas2r_trace("disc_evt: %d", dc->disc_evt); + set_bit(AF_DISC_IN_PROG, &a->flags); + dc->flags = 0; + + if (test_bit(AF_DISC_POLLED, &a->flags)) + dc->flags |= DCF_POLLED; + + rq->interrupt_cx = dc; + rq->req_stat = RS_SUCCESS; + + /* Decode the event code */ + if (dc->disc_evt & DCDE_DEV_SCAN) { + dc->disc_evt &= ~DCDE_DEV_SCAN; + + dc->flags |= DCF_DEV_SCAN; + dc->state = DCS_BLOCK_DEV_SCAN; + } else if (dc->disc_evt & DCDE_DEV_CHANGE) { + dc->disc_evt &= ~DCDE_DEV_CHANGE; + + dc->flags |= DCF_DEV_CHANGE; + dc->state = DCS_DEV_RMV; + } + + /* Continue interrupt driven discovery */ + if (!test_bit(AF_DISC_POLLED, &a->flags)) + ret = esas2r_disc_continue(a, rq); + else + ret = true; + + esas2r_trace_exit(); + + return ret; +} + +static bool esas2r_disc_continue(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + bool rslt; + + /* Device discovery/removal */ + while (dc->flags & (DCF_DEV_CHANGE | DCF_DEV_SCAN)) { + rslt = false; + + switch (dc->state) { + case DCS_DEV_RMV: + + rslt = esas2r_disc_dev_remove(a, rq); + break; + + case DCS_DEV_ADD: + + rslt = esas2r_disc_dev_add(a, rq); + break; + + case DCS_BLOCK_DEV_SCAN: + + rslt = esas2r_disc_block_dev_scan(a, rq); + break; + + case DCS_RAID_GRP_INFO: + + rslt = esas2r_disc_raid_grp_info(a, rq); + break; + + case DCS_PART_INFO: + + rslt = esas2r_disc_part_info(a, rq); + break; + + case DCS_PT_DEV_INFO: + + rslt = esas2r_disc_passthru_dev_info(a, rq); + break; + case DCS_PT_DEV_ADDR: + + rslt = esas2r_disc_passthru_dev_addr(a, rq); + break; + case DCS_DISC_DONE: + + dc->flags &= ~(DCF_DEV_CHANGE | DCF_DEV_SCAN); + break; + + default: + + esas2r_bugon(); + dc->state = DCS_DISC_DONE; + break; + } + + if (rslt) + return true; + } + + /* Discovery is done...for now. */ + rq->interrupt_cx = NULL; + + if (!test_bit(AF_DISC_PENDING, &a->flags)) + esas2r_disc_fix_curr_requests(a); + + clear_bit(AF_DISC_IN_PROG, &a->flags); + + /* Start the next discovery. */ + return esas2r_disc_start_port(a); +} + +static bool esas2r_disc_start_request(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + unsigned long flags; + + /* Set the timeout to a minimum value. */ + if (rq->timeout < ESAS2R_DEFAULT_TMO) + rq->timeout = ESAS2R_DEFAULT_TMO; + + /* + * Override the request type to distinguish discovery requests. If we + * end up deferring the request, esas2r_disc_local_start_request() + * will be called to restart it. + */ + rq->req_type = RT_DISC_REQ; + + spin_lock_irqsave(&a->queue_lock, flags); + + if (!test_bit(AF_CHPRST_PENDING, &a->flags) && + !test_bit(AF_FLASHING, &a->flags)) + esas2r_disc_local_start_request(a, rq); + else + list_add_tail(&rq->req_list, &a->defer_list); + + spin_unlock_irqrestore(&a->queue_lock, flags); + + return true; +} + +void esas2r_disc_local_start_request(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + esas2r_trace_enter(); + + list_add_tail(&rq->req_list, &a->active_list); + + esas2r_start_vda_request(a, rq); + + esas2r_trace_exit(); + + return; +} + +static void esas2r_disc_abort(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + + esas2r_trace_enter(); + + /* abort the current discovery */ + + dc->state = DCS_DISC_DONE; + + esas2r_trace_exit(); +} + +static bool esas2r_disc_block_dev_scan(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + bool rslt; + + esas2r_trace_enter(); + + esas2r_rq_init_request(rq, a); + + esas2r_build_mgt_req(a, + rq, + VDAMGT_DEV_SCAN, + 0, + 0, + 0, + NULL); + + rq->comp_cb = esas2r_disc_block_dev_scan_cb; + + rq->timeout = 30000; + rq->interrupt_cx = dc; + + rslt = esas2r_disc_start_request(a, rq); + + esas2r_trace_exit(); + + return rslt; +} + +static void esas2r_disc_block_dev_scan_cb(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + unsigned long flags; + + esas2r_trace_enter(); + + spin_lock_irqsave(&a->mem_lock, flags); + + if (rq->req_stat == RS_SUCCESS) + dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation; + + dc->state = DCS_RAID_GRP_INFO; + dc->raid_grp_ix = 0; + + esas2r_rq_destroy_request(rq, a); + + /* continue discovery if it's interrupt driven */ + + if (!(dc->flags & DCF_POLLED)) + esas2r_disc_continue(a, rq); + + spin_unlock_irqrestore(&a->mem_lock, flags); + + esas2r_trace_exit(); +} + +static bool esas2r_disc_raid_grp_info(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + bool rslt; + struct atto_vda_grp_info *grpinfo; + + esas2r_trace_enter(); + + esas2r_trace("raid_group_idx: %d", dc->raid_grp_ix); + + if (dc->raid_grp_ix >= VDA_MAX_RAID_GROUPS) { + dc->state = DCS_DISC_DONE; + + esas2r_trace_exit(); + + return false; + } + + esas2r_rq_init_request(rq, a); + + grpinfo = &rq->vda_rsp_data->mgt_data.data.grp_info; + + memset(grpinfo, 0, sizeof(struct atto_vda_grp_info)); + + esas2r_build_mgt_req(a, + rq, + VDAMGT_GRP_INFO, + dc->scan_gen, + 0, + sizeof(struct atto_vda_grp_info), + NULL); + + grpinfo->grp_index = dc->raid_grp_ix; + + rq->comp_cb = esas2r_disc_raid_grp_info_cb; + + rq->interrupt_cx = dc; + + rslt = esas2r_disc_start_request(a, rq); + + esas2r_trace_exit(); + + return rslt; +} + +static void esas2r_disc_raid_grp_info_cb(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + unsigned long flags; + struct atto_vda_grp_info *grpinfo; + + esas2r_trace_enter(); + + spin_lock_irqsave(&a->mem_lock, flags); + + if (rq->req_stat == RS_SCAN_GEN) { + dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation; + dc->raid_grp_ix = 0; + goto done; + } + + if (rq->req_stat == RS_SUCCESS) { + grpinfo = &rq->vda_rsp_data->mgt_data.data.grp_info; + + if (grpinfo->status != VDA_GRP_STAT_ONLINE + && grpinfo->status != VDA_GRP_STAT_DEGRADED) { + /* go to the next group. */ + + dc->raid_grp_ix++; + } else { + memcpy(&dc->raid_grp_name[0], + &grpinfo->grp_name[0], + sizeof(grpinfo->grp_name)); + + dc->interleave = le32_to_cpu(grpinfo->interleave); + dc->block_size = le32_to_cpu(grpinfo->block_size); + + dc->state = DCS_PART_INFO; + dc->part_num = 0; + } + } else { + if (!(rq->req_stat == RS_GRP_INVALID)) { + esas2r_log(ESAS2R_LOG_WARN, + "A request for RAID group info failed - " + "returned with %x", + rq->req_stat); + } + + dc->dev_ix = 0; + dc->state = DCS_PT_DEV_INFO; + } + +done: + + esas2r_rq_destroy_request(rq, a); + + /* continue discovery if it's interrupt driven */ + + if (!(dc->flags & DCF_POLLED)) + esas2r_disc_continue(a, rq); + + spin_unlock_irqrestore(&a->mem_lock, flags); + + esas2r_trace_exit(); +} + +static bool esas2r_disc_part_info(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + bool rslt; + struct atto_vdapart_info *partinfo; + + esas2r_trace_enter(); + + esas2r_trace("part_num: %d", dc->part_num); + + if (dc->part_num >= VDA_MAX_PARTITIONS) { + dc->state = DCS_RAID_GRP_INFO; + dc->raid_grp_ix++; + + esas2r_trace_exit(); + + return false; + } + + esas2r_rq_init_request(rq, a); + + partinfo = &rq->vda_rsp_data->mgt_data.data.part_info; + + memset(partinfo, 0, sizeof(struct atto_vdapart_info)); + + esas2r_build_mgt_req(a, + rq, + VDAMGT_PART_INFO, + dc->scan_gen, + 0, + sizeof(struct atto_vdapart_info), + NULL); + + partinfo->part_no = dc->part_num; + + memcpy(&partinfo->grp_name[0], + &dc->raid_grp_name[0], + sizeof(partinfo->grp_name)); + + rq->comp_cb = esas2r_disc_part_info_cb; + + rq->interrupt_cx = dc; + + rslt = esas2r_disc_start_request(a, rq); + + esas2r_trace_exit(); + + return rslt; +} + +static void esas2r_disc_part_info_cb(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + unsigned long flags; + struct atto_vdapart_info *partinfo; + + esas2r_trace_enter(); + + spin_lock_irqsave(&a->mem_lock, flags); + + if (rq->req_stat == RS_SCAN_GEN) { + dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation; + dc->raid_grp_ix = 0; + dc->state = DCS_RAID_GRP_INFO; + } else if (rq->req_stat == RS_SUCCESS) { + partinfo = &rq->vda_rsp_data->mgt_data.data.part_info; + + dc->part_num = partinfo->part_no; + + dc->curr_virt_id = le16_to_cpu(partinfo->target_id); + + esas2r_targ_db_add_raid(a, dc); + + dc->part_num++; + } else { + if (!(rq->req_stat == RS_PART_LAST)) { + esas2r_log(ESAS2R_LOG_WARN, + "A request for RAID group partition info " + "failed - status:%d", rq->req_stat); + } + + dc->state = DCS_RAID_GRP_INFO; + dc->raid_grp_ix++; + } + + esas2r_rq_destroy_request(rq, a); + + /* continue discovery if it's interrupt driven */ + + if (!(dc->flags & DCF_POLLED)) + esas2r_disc_continue(a, rq); + + spin_unlock_irqrestore(&a->mem_lock, flags); + + esas2r_trace_exit(); +} + +static bool esas2r_disc_passthru_dev_info(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + bool rslt; + struct atto_vda_devinfo *devinfo; + + esas2r_trace_enter(); + + esas2r_trace("dev_ix: %d", dc->dev_ix); + + esas2r_rq_init_request(rq, a); + + devinfo = &rq->vda_rsp_data->mgt_data.data.dev_info; + + memset(devinfo, 0, sizeof(struct atto_vda_devinfo)); + + esas2r_build_mgt_req(a, + rq, + VDAMGT_DEV_PT_INFO, + dc->scan_gen, + dc->dev_ix, + sizeof(struct atto_vda_devinfo), + NULL); + + rq->comp_cb = esas2r_disc_passthru_dev_info_cb; + + rq->interrupt_cx = dc; + + rslt = esas2r_disc_start_request(a, rq); + + esas2r_trace_exit(); + + return rslt; +} + +static void esas2r_disc_passthru_dev_info_cb(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + unsigned long flags; + struct atto_vda_devinfo *devinfo; + + esas2r_trace_enter(); + + spin_lock_irqsave(&a->mem_lock, flags); + + if (rq->req_stat == RS_SCAN_GEN) { + dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation; + dc->dev_ix = 0; + dc->state = DCS_PT_DEV_INFO; + } else if (rq->req_stat == RS_SUCCESS) { + devinfo = &rq->vda_rsp_data->mgt_data.data.dev_info; + + dc->dev_ix = le16_to_cpu(rq->func_rsp.mgt_rsp.dev_index); + + dc->curr_virt_id = le16_to_cpu(devinfo->target_id); + + if (le16_to_cpu(devinfo->features) & VDADEVFEAT_PHYS_ID) { + dc->curr_phys_id = + le16_to_cpu(devinfo->phys_target_id); + dc->dev_addr_type = ATTO_GDA_AT_PORT; + dc->state = DCS_PT_DEV_ADDR; + + esas2r_trace("curr_virt_id: %d", dc->curr_virt_id); + esas2r_trace("curr_phys_id: %d", dc->curr_phys_id); + } else { + dc->dev_ix++; + } + } else { + if (!(rq->req_stat == RS_DEV_INVALID)) { + esas2r_log(ESAS2R_LOG_WARN, + "A request for device information failed - " + "status:%d", rq->req_stat); + } + + dc->state = DCS_DISC_DONE; + } + + esas2r_rq_destroy_request(rq, a); + + /* continue discovery if it's interrupt driven */ + + if (!(dc->flags & DCF_POLLED)) + esas2r_disc_continue(a, rq); + + spin_unlock_irqrestore(&a->mem_lock, flags); + + esas2r_trace_exit(); +} + +static bool esas2r_disc_passthru_dev_addr(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + bool rslt; + struct atto_ioctl *hi; + struct esas2r_sg_context sgc; + + esas2r_trace_enter(); + + esas2r_rq_init_request(rq, a); + + /* format the request. */ + + sgc.cur_offset = NULL; + sgc.get_phys_addr = (PGETPHYSADDR)esas2r_disc_get_phys_addr; + sgc.length = offsetof(struct atto_ioctl, data) + + sizeof(struct atto_hba_get_device_address); + + esas2r_sgc_init(&sgc, a, rq, rq->vrq->ioctl.sge); + + esas2r_build_ioctl_req(a, rq, sgc.length, VDA_IOCTL_HBA); + + if (!esas2r_build_sg_list(a, rq, &sgc)) { + esas2r_rq_destroy_request(rq, a); + + esas2r_trace_exit(); + + return false; + } + + rq->comp_cb = esas2r_disc_passthru_dev_addr_cb; + + rq->interrupt_cx = dc; + + /* format the IOCTL data. */ + + hi = (struct atto_ioctl *)a->disc_buffer; + + memset(a->disc_buffer, 0, ESAS2R_DISC_BUF_LEN); + + hi->version = ATTO_VER_GET_DEV_ADDR0; + hi->function = ATTO_FUNC_GET_DEV_ADDR; + hi->flags = HBAF_TUNNEL; + + hi->data.get_dev_addr.target_id = le32_to_cpu(dc->curr_phys_id); + hi->data.get_dev_addr.addr_type = dc->dev_addr_type; + + /* start it up. */ + + rslt = esas2r_disc_start_request(a, rq); + + esas2r_trace_exit(); + + return rslt; +} + +static void esas2r_disc_passthru_dev_addr_cb(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + struct esas2r_target *t = NULL; + unsigned long flags; + struct atto_ioctl *hi; + u16 addrlen; + + esas2r_trace_enter(); + + spin_lock_irqsave(&a->mem_lock, flags); + + hi = (struct atto_ioctl *)a->disc_buffer; + + if (rq->req_stat == RS_SUCCESS + && hi->status == ATTO_STS_SUCCESS) { + addrlen = le16_to_cpu(hi->data.get_dev_addr.addr_len); + + if (dc->dev_addr_type == ATTO_GDA_AT_PORT) { + if (addrlen == sizeof(u64)) + memcpy(&dc->sas_addr, + &hi->data.get_dev_addr.address[0], + addrlen); + else + memset(&dc->sas_addr, 0, sizeof(dc->sas_addr)); + + /* Get the unique identifier. */ + dc->dev_addr_type = ATTO_GDA_AT_UNIQUE; + + goto next_dev_addr; + } else { + /* Add the pass through target. */ + if (HIBYTE(addrlen) == 0) { + t = esas2r_targ_db_add_pthru(a, + dc, + &hi->data. + get_dev_addr. + address[0], + (u8)hi->data. + get_dev_addr. + addr_len); + + if (t) + memcpy(&t->sas_addr, &dc->sas_addr, + sizeof(t->sas_addr)); + } else { + /* getting the back end data failed */ + + esas2r_log(ESAS2R_LOG_WARN, + "an error occurred retrieving the " + "back end data (%s:%d)", + __func__, + __LINE__); + } + } + } else { + /* getting the back end data failed */ + + esas2r_log(ESAS2R_LOG_WARN, + "an error occurred retrieving the back end data - " + "rq->req_stat:%d hi->status:%d", + rq->req_stat, hi->status); + } + + /* proceed to the next device. */ + + if (dc->flags & DCF_DEV_SCAN) { + dc->dev_ix++; + dc->state = DCS_PT_DEV_INFO; + } else if (dc->flags & DCF_DEV_CHANGE) { + dc->curr_targ++; + dc->state = DCS_DEV_ADD; + } else { + esas2r_bugon(); + } + +next_dev_addr: + esas2r_rq_destroy_request(rq, a); + + /* continue discovery if it's interrupt driven */ + + if (!(dc->flags & DCF_POLLED)) + esas2r_disc_continue(a, rq); + + spin_unlock_irqrestore(&a->mem_lock, flags); + + esas2r_trace_exit(); +} + +static u32 esas2r_disc_get_phys_addr(struct esas2r_sg_context *sgc, u64 *addr) +{ + struct esas2r_adapter *a = sgc->adapter; + + if (sgc->length > ESAS2R_DISC_BUF_LEN) + esas2r_bugon(); + + *addr = a->uncached_phys + + (u64)((u8 *)a->disc_buffer - a->uncached); + + return sgc->length; +} + +static bool esas2r_disc_dev_remove(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + struct esas2r_target *t; + struct esas2r_target *t2; + + esas2r_trace_enter(); + + /* process removals. */ + + for (t = a->targetdb; t < a->targetdb_end; t++) { + if (t->new_target_state != TS_NOT_PRESENT) + continue; + + t->new_target_state = TS_INVALID; + + /* remove the right target! */ + + t2 = + esas2r_targ_db_find_by_virt_id(a, + esas2r_targ_get_id(t, + a)); + + if (t2) + esas2r_targ_db_remove(a, t2); + } + + /* removals complete. process arrivals. */ + + dc->state = DCS_DEV_ADD; + dc->curr_targ = a->targetdb; + + esas2r_trace_exit(); + + return false; +} + +static bool esas2r_disc_dev_add(struct esas2r_adapter *a, + struct esas2r_request *rq) +{ + struct esas2r_disc_context *dc = + (struct esas2r_disc_context *)rq->interrupt_cx; + struct esas2r_target *t = dc->curr_targ; + + if (t >= a->targetdb_end) { + /* done processing state changes. */ + + dc->state = DCS_DISC_DONE; + } else if (t->new_target_state == TS_PRESENT) { + struct atto_vda_ae_lu *luevt = &t->lu_event; + + esas2r_trace_enter(); + + /* clear this now in case more events come in. */ + + t->new_target_state = TS_INVALID; + + /* setup the discovery context for adding this device. */ + + dc->curr_virt_id = esas2r_targ_get_id(t, a); + + if ((luevt->hdr.bylength >= offsetof(struct atto_vda_ae_lu, id) + + sizeof(struct atto_vda_ae_lu_tgt_lun_raid)) + && !(luevt->dwevent & VDAAE_LU_PASSTHROUGH)) { + dc->block_size = luevt->id.tgtlun_raid.dwblock_size; + dc->interleave = luevt->id.tgtlun_raid.dwinterleave; + } else { + dc->block_size = 0; + dc->interleave = 0; + } + + /* determine the device type being added. */ + + if (luevt->dwevent & VDAAE_LU_PASSTHROUGH) { + if (luevt->dwevent & VDAAE_LU_PHYS_ID) { + dc->state = DCS_PT_DEV_ADDR; + dc->dev_addr_type = ATTO_GDA_AT_PORT; + dc->curr_phys_id = luevt->wphys_target_id; + } else { + esas2r_log(ESAS2R_LOG_WARN, + "luevt->dwevent does not have the " + "VDAAE_LU_PHYS_ID bit set (%s:%d)", + __func__, __LINE__); + } + } else { + dc->raid_grp_name[0] = 0; + + esas2r_targ_db_add_raid(a, dc); + } + + esas2r_trace("curr_virt_id: %d", dc->curr_virt_id); + esas2r_trace("curr_phys_id: %d", dc->curr_phys_id); + esas2r_trace("dwevent: %d", luevt->dwevent); + + esas2r_trace_exit(); + } + + if (dc->state == DCS_DEV_ADD) { + /* go to the next device. */ + + dc->curr_targ++; + } + + return false; +} + +/* + * When discovery is done, find all requests on defer queue and + * test if they need to be modified. If a target is no longer present + * then complete the request with RS_SEL. Otherwise, update the + * target_id since after a hibernate it can be a different value. + * VDA does not make passthrough target IDs persistent. + */ +static void esas2r_disc_fix_curr_requests(struct esas2r_adapter *a) +{ + unsigned long flags; + struct esas2r_target *t; + struct esas2r_request *rq; + struct list_head *element; + + /* update virt_targ_id in any outstanding esas2r_requests */ + + spin_lock_irqsave(&a->queue_lock, flags); + + list_for_each(element, &a->defer_list) { + rq = list_entry(element, struct esas2r_request, req_list); + if (rq->vrq->scsi.function == VDA_FUNC_SCSI) { + t = a->targetdb + rq->target_id; + + if (t->target_state == TS_PRESENT) + rq->vrq->scsi.target_id = le16_to_cpu( + t->virt_targ_id); + else + rq->req_stat = RS_SEL; + } + + } + + spin_unlock_irqrestore(&a->queue_lock, flags); +} |