| /* |
| * Serial Attached SCSI (SAS) class SCSI Host glue. |
| * |
| * Copyright (C) 2005 Adaptec, Inc. All rights reserved. |
| * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> |
| * |
| * This file is licensed under GPLv2. |
| * |
| * 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/kthread.h> |
| #include <linux/firmware.h> |
| #include <linux/ctype.h> |
| |
| #include "sas_internal.h" |
| |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_tcq.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_eh.h> |
| #include <scsi/scsi_transport.h> |
| #include <scsi/scsi_transport_sas.h> |
| #include <scsi/sas_ata.h> |
| #include "../scsi_sas_internal.h" |
| #include "../scsi_transport_api.h" |
| #include "../scsi_priv.h" |
| |
| #include <linux/err.h> |
| #include <linux/blkdev.h> |
| #include <linux/freezer.h> |
| #include <linux/gfp.h> |
| #include <linux/scatterlist.h> |
| #include <linux/libata.h> |
| |
| /* ---------- SCSI Host glue ---------- */ |
| |
| static void sas_scsi_task_done(struct sas_task *task) |
| { |
| struct task_status_struct *ts = &task->task_status; |
| struct scsi_cmnd *sc = task->uldd_task; |
| int hs = 0, stat = 0; |
| |
| if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) { |
| /* Aborted tasks will be completed by the error handler */ |
| SAS_DPRINTK("task done but aborted\n"); |
| return; |
| } |
| |
| if (unlikely(!sc)) { |
| SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n"); |
| list_del_init(&task->list); |
| sas_free_task(task); |
| return; |
| } |
| |
| if (ts->resp == SAS_TASK_UNDELIVERED) { |
| /* transport error */ |
| hs = DID_NO_CONNECT; |
| } else { /* ts->resp == SAS_TASK_COMPLETE */ |
| /* task delivered, what happened afterwards? */ |
| switch (ts->stat) { |
| case SAS_DEV_NO_RESPONSE: |
| case SAS_INTERRUPTED: |
| case SAS_PHY_DOWN: |
| case SAS_NAK_R_ERR: |
| case SAS_OPEN_TO: |
| hs = DID_NO_CONNECT; |
| break; |
| case SAS_DATA_UNDERRUN: |
| scsi_set_resid(sc, ts->residual); |
| if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow) |
| hs = DID_ERROR; |
| break; |
| case SAS_DATA_OVERRUN: |
| hs = DID_ERROR; |
| break; |
| case SAS_QUEUE_FULL: |
| hs = DID_SOFT_ERROR; /* retry */ |
| break; |
| case SAS_DEVICE_UNKNOWN: |
| hs = DID_BAD_TARGET; |
| break; |
| case SAS_SG_ERR: |
| hs = DID_PARITY; |
| break; |
| case SAS_OPEN_REJECT: |
| if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY) |
| hs = DID_SOFT_ERROR; /* retry */ |
| else |
| hs = DID_ERROR; |
| break; |
| case SAS_PROTO_RESPONSE: |
| SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP " |
| "task; please report this\n", |
| task->dev->port->ha->sas_ha_name); |
| break; |
| case SAS_ABORTED_TASK: |
| hs = DID_ABORT; |
| break; |
| case SAM_CHECK_COND: |
| memcpy(sc->sense_buffer, ts->buf, |
| min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size)); |
| stat = SAM_CHECK_COND; |
| break; |
| default: |
| stat = ts->stat; |
| break; |
| } |
| } |
| ASSIGN_SAS_TASK(sc, NULL); |
| sc->result = (hs << 16) | stat; |
| list_del_init(&task->list); |
| sas_free_task(task); |
| sc->scsi_done(sc); |
| } |
| |
| static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd) |
| { |
| enum task_attribute ta = TASK_ATTR_SIMPLE; |
| if (cmd->request && blk_rq_tagged(cmd->request)) { |
| if (cmd->device->ordered_tags && |
| (cmd->request->cmd_flags & REQ_HARDBARRIER)) |
| ta = TASK_ATTR_ORDERED; |
| } |
| return ta; |
| } |
| |
| static struct sas_task *sas_create_task(struct scsi_cmnd *cmd, |
| struct domain_device *dev, |
| gfp_t gfp_flags) |
| { |
| struct sas_task *task = sas_alloc_task(gfp_flags); |
| struct scsi_lun lun; |
| |
| if (!task) |
| return NULL; |
| |
| task->uldd_task = cmd; |
| ASSIGN_SAS_TASK(cmd, task); |
| |
| task->dev = dev; |
| task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */ |
| |
| task->ssp_task.retry_count = 1; |
| int_to_scsilun(cmd->device->lun, &lun); |
| memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8); |
| task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd); |
| memcpy(task->ssp_task.cdb, cmd->cmnd, 16); |
| |
| task->scatter = scsi_sglist(cmd); |
| task->num_scatter = scsi_sg_count(cmd); |
| task->total_xfer_len = scsi_bufflen(cmd); |
| task->data_dir = cmd->sc_data_direction; |
| |
| task->task_done = sas_scsi_task_done; |
| |
| return task; |
| } |
| |
| int sas_queue_up(struct sas_task *task) |
| { |
| struct sas_ha_struct *sas_ha = task->dev->port->ha; |
| struct scsi_core *core = &sas_ha->core; |
| unsigned long flags; |
| LIST_HEAD(list); |
| |
| spin_lock_irqsave(&core->task_queue_lock, flags); |
| if (sas_ha->lldd_queue_size < core->task_queue_size + 1) { |
| spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| return -SAS_QUEUE_FULL; |
| } |
| list_add_tail(&task->list, &core->task_queue); |
| core->task_queue_size += 1; |
| spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| wake_up_process(core->queue_thread); |
| |
| return 0; |
| } |
| |
| /** |
| * sas_queuecommand -- Enqueue a command for processing |
| * @parameters: See SCSI Core documentation |
| * |
| * Note: XXX: Remove the host unlock/lock pair when SCSI Core can |
| * call us without holding an IRQ spinlock... |
| */ |
| int sas_queuecommand(struct scsi_cmnd *cmd, |
| void (*scsi_done)(struct scsi_cmnd *)) |
| __releases(host->host_lock) |
| __acquires(dev->sata_dev.ap->lock) |
| __releases(dev->sata_dev.ap->lock) |
| __acquires(host->host_lock) |
| { |
| int res = 0; |
| struct domain_device *dev = cmd_to_domain_dev(cmd); |
| struct Scsi_Host *host = cmd->device->host; |
| struct sas_internal *i = to_sas_internal(host->transportt); |
| |
| spin_unlock_irq(host->host_lock); |
| |
| { |
| struct sas_ha_struct *sas_ha = dev->port->ha; |
| struct sas_task *task; |
| |
| if (dev_is_sata(dev)) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(dev->sata_dev.ap->lock, flags); |
| res = ata_sas_queuecmd(cmd, scsi_done, |
| dev->sata_dev.ap); |
| spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags); |
| goto out; |
| } |
| |
| res = -ENOMEM; |
| task = sas_create_task(cmd, dev, GFP_ATOMIC); |
| if (!task) |
| goto out; |
| |
| cmd->scsi_done = scsi_done; |
| /* Queue up, Direct Mode or Task Collector Mode. */ |
| if (sas_ha->lldd_max_execute_num < 2) |
| res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); |
| else |
| res = sas_queue_up(task); |
| |
| /* Examine */ |
| if (res) { |
| SAS_DPRINTK("lldd_execute_task returned: %d\n", res); |
| ASSIGN_SAS_TASK(cmd, NULL); |
| sas_free_task(task); |
| if (res == -SAS_QUEUE_FULL) { |
| cmd->result = DID_SOFT_ERROR << 16; /* retry */ |
| res = 0; |
| scsi_done(cmd); |
| } |
| goto out; |
| } |
| } |
| out: |
| spin_lock_irq(host->host_lock); |
| return res; |
| } |
| |
| static void sas_eh_finish_cmd(struct scsi_cmnd *cmd) |
| { |
| struct sas_task *task = TO_SAS_TASK(cmd); |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host); |
| |
| /* remove the aborted task flag to allow the task to be |
| * completed now. At this point, we only get called following |
| * an actual abort of the task, so we should be guaranteed not |
| * to be racing with any completions from the LLD (hence we |
| * don't need the task state lock to clear the flag) */ |
| task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; |
| /* Now call task_done. However, task will be free'd after |
| * this */ |
| task->task_done(task); |
| /* now finish the command and move it on to the error |
| * handler done list, this also takes it off the |
| * error handler pending list */ |
| scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q); |
| } |
| |
| static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd) |
| { |
| struct scsi_cmnd *cmd, *n; |
| |
| list_for_each_entry_safe(cmd, n, error_q, eh_entry) { |
| if (cmd->device->sdev_target == my_cmd->device->sdev_target && |
| cmd->device->lun == my_cmd->device->lun) |
| sas_eh_finish_cmd(cmd); |
| } |
| } |
| |
| static void sas_scsi_clear_queue_I_T(struct list_head *error_q, |
| struct domain_device *dev) |
| { |
| struct scsi_cmnd *cmd, *n; |
| |
| list_for_each_entry_safe(cmd, n, error_q, eh_entry) { |
| struct domain_device *x = cmd_to_domain_dev(cmd); |
| |
| if (x == dev) |
| sas_eh_finish_cmd(cmd); |
| } |
| } |
| |
| static void sas_scsi_clear_queue_port(struct list_head *error_q, |
| struct asd_sas_port *port) |
| { |
| struct scsi_cmnd *cmd, *n; |
| |
| list_for_each_entry_safe(cmd, n, error_q, eh_entry) { |
| struct domain_device *dev = cmd_to_domain_dev(cmd); |
| struct asd_sas_port *x = dev->port; |
| |
| if (x == port) |
| sas_eh_finish_cmd(cmd); |
| } |
| } |
| |
| enum task_disposition { |
| TASK_IS_DONE, |
| TASK_IS_ABORTED, |
| TASK_IS_AT_LU, |
| TASK_IS_NOT_AT_LU, |
| TASK_ABORT_FAILED, |
| }; |
| |
| static enum task_disposition sas_scsi_find_task(struct sas_task *task) |
| { |
| struct sas_ha_struct *ha = task->dev->port->ha; |
| unsigned long flags; |
| int i, res; |
| struct sas_internal *si = |
| to_sas_internal(task->dev->port->ha->core.shost->transportt); |
| |
| if (ha->lldd_max_execute_num > 1) { |
| struct scsi_core *core = &ha->core; |
| struct sas_task *t, *n; |
| |
| spin_lock_irqsave(&core->task_queue_lock, flags); |
| list_for_each_entry_safe(t, n, &core->task_queue, list) { |
| if (task == t) { |
| list_del_init(&t->list); |
| spin_unlock_irqrestore(&core->task_queue_lock, |
| flags); |
| SAS_DPRINTK("%s: task 0x%p aborted from " |
| "task_queue\n", |
| __func__, task); |
| return TASK_IS_ABORTED; |
| } |
| } |
| spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| } |
| |
| for (i = 0; i < 5; i++) { |
| SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task); |
| res = si->dft->lldd_abort_task(task); |
| |
| spin_lock_irqsave(&task->task_state_lock, flags); |
| if (task->task_state_flags & SAS_TASK_STATE_DONE) { |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| SAS_DPRINTK("%s: task 0x%p is done\n", __func__, |
| task); |
| return TASK_IS_DONE; |
| } |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| |
| if (res == TMF_RESP_FUNC_COMPLETE) { |
| SAS_DPRINTK("%s: task 0x%p is aborted\n", |
| __func__, task); |
| return TASK_IS_ABORTED; |
| } else if (si->dft->lldd_query_task) { |
| SAS_DPRINTK("%s: querying task 0x%p\n", |
| __func__, task); |
| res = si->dft->lldd_query_task(task); |
| switch (res) { |
| case TMF_RESP_FUNC_SUCC: |
| SAS_DPRINTK("%s: task 0x%p at LU\n", |
| __func__, task); |
| return TASK_IS_AT_LU; |
| case TMF_RESP_FUNC_COMPLETE: |
| SAS_DPRINTK("%s: task 0x%p not at LU\n", |
| __func__, task); |
| return TASK_IS_NOT_AT_LU; |
| case TMF_RESP_FUNC_FAILED: |
| SAS_DPRINTK("%s: task 0x%p failed to abort\n", |
| __func__, task); |
| return TASK_ABORT_FAILED; |
| } |
| |
| } |
| } |
| return res; |
| } |
| |
| static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd) |
| { |
| int res = TMF_RESP_FUNC_FAILED; |
| struct scsi_lun lun; |
| struct sas_internal *i = |
| to_sas_internal(dev->port->ha->core.shost->transportt); |
| |
| int_to_scsilun(cmd->device->lun, &lun); |
| |
| SAS_DPRINTK("eh: device %llx LUN %x has the task\n", |
| SAS_ADDR(dev->sas_addr), |
| cmd->device->lun); |
| |
| if (i->dft->lldd_abort_task_set) |
| res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun); |
| |
| if (res == TMF_RESP_FUNC_FAILED) { |
| if (i->dft->lldd_clear_task_set) |
| res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun); |
| } |
| |
| if (res == TMF_RESP_FUNC_FAILED) { |
| if (i->dft->lldd_lu_reset) |
| res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); |
| } |
| |
| return res; |
| } |
| |
| static int sas_recover_I_T(struct domain_device *dev) |
| { |
| int res = TMF_RESP_FUNC_FAILED; |
| struct sas_internal *i = |
| to_sas_internal(dev->port->ha->core.shost->transportt); |
| |
| SAS_DPRINTK("I_T nexus reset for dev %016llx\n", |
| SAS_ADDR(dev->sas_addr)); |
| |
| if (i->dft->lldd_I_T_nexus_reset) |
| res = i->dft->lldd_I_T_nexus_reset(dev); |
| |
| return res; |
| } |
| |
| /* Find the sas_phy that's attached to this device */ |
| struct sas_phy *sas_find_local_phy(struct domain_device *dev) |
| { |
| struct domain_device *pdev = dev->parent; |
| struct ex_phy *exphy = NULL; |
| int i; |
| |
| /* Directly attached device */ |
| if (!pdev) |
| return dev->port->phy; |
| |
| /* Otherwise look in the expander */ |
| for (i = 0; i < pdev->ex_dev.num_phys; i++) |
| if (!memcmp(dev->sas_addr, |
| pdev->ex_dev.ex_phy[i].attached_sas_addr, |
| SAS_ADDR_SIZE)) { |
| exphy = &pdev->ex_dev.ex_phy[i]; |
| break; |
| } |
| |
| BUG_ON(!exphy); |
| return exphy->phy; |
| } |
| EXPORT_SYMBOL_GPL(sas_find_local_phy); |
| |
| /* Attempt to send a LUN reset message to a device */ |
| int sas_eh_device_reset_handler(struct scsi_cmnd *cmd) |
| { |
| struct domain_device *dev = cmd_to_domain_dev(cmd); |
| struct sas_internal *i = |
| to_sas_internal(dev->port->ha->core.shost->transportt); |
| struct scsi_lun lun; |
| int res; |
| |
| int_to_scsilun(cmd->device->lun, &lun); |
| |
| if (!i->dft->lldd_lu_reset) |
| return FAILED; |
| |
| res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); |
| if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) |
| return SUCCESS; |
| |
| return FAILED; |
| } |
| |
| /* Attempt to send a phy (bus) reset */ |
| int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd) |
| { |
| struct domain_device *dev = cmd_to_domain_dev(cmd); |
| struct sas_phy *phy = sas_find_local_phy(dev); |
| int res; |
| |
| res = sas_phy_reset(phy, 1); |
| if (res) |
| SAS_DPRINTK("Bus reset of %s failed 0x%x\n", |
| kobject_name(&phy->dev.kobj), |
| res); |
| if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) |
| return SUCCESS; |
| |
| return FAILED; |
| } |
| |
| /* Try to reset a device */ |
| static int try_to_reset_cmd_device(struct scsi_cmnd *cmd) |
| { |
| int res; |
| struct Scsi_Host *shost = cmd->device->host; |
| |
| if (!shost->hostt->eh_device_reset_handler) |
| goto try_bus_reset; |
| |
| res = shost->hostt->eh_device_reset_handler(cmd); |
| if (res == SUCCESS) |
| return res; |
| |
| try_bus_reset: |
| if (shost->hostt->eh_bus_reset_handler) |
| return shost->hostt->eh_bus_reset_handler(cmd); |
| |
| return FAILED; |
| } |
| |
| static int sas_eh_handle_sas_errors(struct Scsi_Host *shost, |
| struct list_head *work_q, |
| struct list_head *done_q) |
| { |
| struct scsi_cmnd *cmd, *n; |
| enum task_disposition res = TASK_IS_DONE; |
| int tmf_resp, need_reset; |
| struct sas_internal *i = to_sas_internal(shost->transportt); |
| unsigned long flags; |
| struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| |
| Again: |
| list_for_each_entry_safe(cmd, n, work_q, eh_entry) { |
| struct sas_task *task = TO_SAS_TASK(cmd); |
| |
| if (!task) |
| continue; |
| |
| list_del_init(&cmd->eh_entry); |
| |
| spin_lock_irqsave(&task->task_state_lock, flags); |
| need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET; |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| |
| if (need_reset) { |
| SAS_DPRINTK("%s: task 0x%p requests reset\n", |
| __func__, task); |
| goto reset; |
| } |
| |
| SAS_DPRINTK("trying to find task 0x%p\n", task); |
| res = sas_scsi_find_task(task); |
| |
| cmd->eh_eflags = 0; |
| |
| switch (res) { |
| case TASK_IS_DONE: |
| SAS_DPRINTK("%s: task 0x%p is done\n", __func__, |
| task); |
| sas_eh_finish_cmd(cmd); |
| continue; |
| case TASK_IS_ABORTED: |
| SAS_DPRINTK("%s: task 0x%p is aborted\n", |
| __func__, task); |
| sas_eh_finish_cmd(cmd); |
| continue; |
| case TASK_IS_AT_LU: |
| SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task); |
| reset: |
| tmf_resp = sas_recover_lu(task->dev, cmd); |
| if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { |
| SAS_DPRINTK("dev %016llx LU %x is " |
| "recovered\n", |
| SAS_ADDR(task->dev), |
| cmd->device->lun); |
| sas_eh_finish_cmd(cmd); |
| sas_scsi_clear_queue_lu(work_q, cmd); |
| goto Again; |
| } |
| /* fallthrough */ |
| case TASK_IS_NOT_AT_LU: |
| case TASK_ABORT_FAILED: |
| SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n", |
| task); |
| tmf_resp = sas_recover_I_T(task->dev); |
| if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { |
| struct domain_device *dev = task->dev; |
| SAS_DPRINTK("I_T %016llx recovered\n", |
| SAS_ADDR(task->dev->sas_addr)); |
| sas_eh_finish_cmd(cmd); |
| sas_scsi_clear_queue_I_T(work_q, dev); |
| goto Again; |
| } |
| /* Hammer time :-) */ |
| try_to_reset_cmd_device(cmd); |
| if (i->dft->lldd_clear_nexus_port) { |
| struct asd_sas_port *port = task->dev->port; |
| SAS_DPRINTK("clearing nexus for port:%d\n", |
| port->id); |
| res = i->dft->lldd_clear_nexus_port(port); |
| if (res == TMF_RESP_FUNC_COMPLETE) { |
| SAS_DPRINTK("clear nexus port:%d " |
| "succeeded\n", port->id); |
| sas_eh_finish_cmd(cmd); |
| sas_scsi_clear_queue_port(work_q, |
| port); |
| goto Again; |
| } |
| } |
| if (i->dft->lldd_clear_nexus_ha) { |
| SAS_DPRINTK("clear nexus ha\n"); |
| res = i->dft->lldd_clear_nexus_ha(ha); |
| if (res == TMF_RESP_FUNC_COMPLETE) { |
| SAS_DPRINTK("clear nexus ha " |
| "succeeded\n"); |
| sas_eh_finish_cmd(cmd); |
| goto clear_q; |
| } |
| } |
| /* If we are here -- this means that no amount |
| * of effort could recover from errors. Quite |
| * possibly the HA just disappeared. |
| */ |
| SAS_DPRINTK("error from device %llx, LUN %x " |
| "couldn't be recovered in any way\n", |
| SAS_ADDR(task->dev->sas_addr), |
| cmd->device->lun); |
| |
| sas_eh_finish_cmd(cmd); |
| goto clear_q; |
| } |
| } |
| return list_empty(work_q); |
| clear_q: |
| SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__); |
| list_for_each_entry_safe(cmd, n, work_q, eh_entry) |
| sas_eh_finish_cmd(cmd); |
| |
| return list_empty(work_q); |
| } |
| |
| void sas_scsi_recover_host(struct Scsi_Host *shost) |
| { |
| struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| unsigned long flags; |
| LIST_HEAD(eh_work_q); |
| |
| spin_lock_irqsave(shost->host_lock, flags); |
| list_splice_init(&shost->eh_cmd_q, &eh_work_q); |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| |
| SAS_DPRINTK("Enter %s\n", __func__); |
| /* |
| * Deal with commands that still have SAS tasks (i.e. they didn't |
| * complete via the normal sas_task completion mechanism) |
| */ |
| if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q)) |
| goto out; |
| |
| /* |
| * Now deal with SCSI commands that completed ok but have a an error |
| * code (and hopefully sense data) attached. This is roughly what |
| * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any |
| * command we see here has no sas_task and is thus unknown to the HA. |
| */ |
| if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q)) |
| scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q); |
| |
| out: |
| scsi_eh_flush_done_q(&ha->eh_done_q); |
| SAS_DPRINTK("--- Exit %s\n", __func__); |
| return; |
| } |
| |
| enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd) |
| { |
| struct sas_task *task = TO_SAS_TASK(cmd); |
| unsigned long flags; |
| |
| if (!task) { |
| cmd->request->timeout /= 2; |
| SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n", |
| cmd, task, (cmd->request->timeout ? |
| "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED")); |
| if (!cmd->request->timeout) |
| return BLK_EH_NOT_HANDLED; |
| return BLK_EH_RESET_TIMER; |
| } |
| |
| spin_lock_irqsave(&task->task_state_lock, flags); |
| BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED); |
| if (task->task_state_flags & SAS_TASK_STATE_DONE) { |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| SAS_DPRINTK("command 0x%p, task 0x%p, timed out: " |
| "BLK_EH_HANDLED\n", cmd, task); |
| return BLK_EH_HANDLED; |
| } |
| if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) { |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: " |
| "BLK_EH_RESET_TIMER\n", |
| cmd, task); |
| return BLK_EH_RESET_TIMER; |
| } |
| task->task_state_flags |= SAS_TASK_STATE_ABORTED; |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| |
| SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n", |
| cmd, task); |
| |
| return BLK_EH_NOT_HANDLED; |
| } |
| |
| int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) |
| { |
| struct domain_device *dev = sdev_to_domain_dev(sdev); |
| |
| if (dev_is_sata(dev)) |
| return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg); |
| |
| return -EINVAL; |
| } |
| |
| struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy) |
| { |
| struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent); |
| struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| struct domain_device *found_dev = NULL; |
| int i; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ha->phy_port_lock, flags); |
| for (i = 0; i < ha->num_phys; i++) { |
| struct asd_sas_port *port = ha->sas_port[i]; |
| struct domain_device *dev; |
| |
| spin_lock(&port->dev_list_lock); |
| list_for_each_entry(dev, &port->dev_list, dev_list_node) { |
| if (rphy == dev->rphy) { |
| found_dev = dev; |
| spin_unlock(&port->dev_list_lock); |
| goto found; |
| } |
| } |
| spin_unlock(&port->dev_list_lock); |
| } |
| found: |
| spin_unlock_irqrestore(&ha->phy_port_lock, flags); |
| |
| return found_dev; |
| } |
| |
| static inline struct domain_device *sas_find_target(struct scsi_target *starget) |
| { |
| struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent); |
| |
| return sas_find_dev_by_rphy(rphy); |
| } |
| |
| int sas_target_alloc(struct scsi_target *starget) |
| { |
| struct domain_device *found_dev = sas_find_target(starget); |
| int res; |
| |
| if (!found_dev) |
| return -ENODEV; |
| |
| if (dev_is_sata(found_dev)) { |
| res = sas_ata_init_host_and_port(found_dev, starget); |
| if (res) |
| return res; |
| } |
| |
| starget->hostdata = found_dev; |
| return 0; |
| } |
| |
| #define SAS_DEF_QD 32 |
| #define SAS_MAX_QD 64 |
| |
| int sas_slave_configure(struct scsi_device *scsi_dev) |
| { |
| struct domain_device *dev = sdev_to_domain_dev(scsi_dev); |
| struct sas_ha_struct *sas_ha; |
| |
| BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE); |
| |
| if (dev_is_sata(dev)) { |
| ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap); |
| return 0; |
| } |
| |
| sas_ha = dev->port->ha; |
| |
| sas_read_port_mode_page(scsi_dev); |
| |
| if (scsi_dev->tagged_supported) { |
| scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG); |
| scsi_activate_tcq(scsi_dev, SAS_DEF_QD); |
| } else { |
| SAS_DPRINTK("device %llx, LUN %x doesn't support " |
| "TCQ\n", SAS_ADDR(dev->sas_addr), |
| scsi_dev->lun); |
| scsi_dev->tagged_supported = 0; |
| scsi_set_tag_type(scsi_dev, 0); |
| scsi_deactivate_tcq(scsi_dev, 1); |
| } |
| |
| scsi_dev->allow_restart = 1; |
| |
| return 0; |
| } |
| |
| void sas_slave_destroy(struct scsi_device *scsi_dev) |
| { |
| struct domain_device *dev = sdev_to_domain_dev(scsi_dev); |
| |
| if (dev_is_sata(dev)) |
| dev->sata_dev.ap->link.device[0].class = ATA_DEV_NONE; |
| } |
| |
| int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth, |
| int reason) |
| { |
| int res = min(new_depth, SAS_MAX_QD); |
| |
| if (reason != SCSI_QDEPTH_DEFAULT) |
| return -EOPNOTSUPP; |
| |
| if (scsi_dev->tagged_supported) |
| scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), |
| res); |
| else { |
| struct domain_device *dev = sdev_to_domain_dev(scsi_dev); |
| sas_printk("device %llx LUN %x queue depth changed to 1\n", |
| SAS_ADDR(dev->sas_addr), |
| scsi_dev->lun); |
| scsi_adjust_queue_depth(scsi_dev, 0, 1); |
| res = 1; |
| } |
| |
| return res; |
| } |
| |
| int sas_change_queue_type(struct scsi_device *scsi_dev, int qt) |
| { |
| if (!scsi_dev->tagged_supported) |
| return 0; |
| |
| scsi_deactivate_tcq(scsi_dev, 1); |
| |
| scsi_set_tag_type(scsi_dev, qt); |
| scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth); |
| |
| return qt; |
| } |
| |
| int sas_bios_param(struct scsi_device *scsi_dev, |
| struct block_device *bdev, |
| sector_t capacity, int *hsc) |
| { |
| hsc[0] = 255; |
| hsc[1] = 63; |
| sector_div(capacity, 255*63); |
| hsc[2] = capacity; |
| |
| return 0; |
| } |
| |
| /* ---------- Task Collector Thread implementation ---------- */ |
| |
| static void sas_queue(struct sas_ha_struct *sas_ha) |
| { |
| struct scsi_core *core = &sas_ha->core; |
| unsigned long flags; |
| LIST_HEAD(q); |
| int can_queue; |
| int res; |
| struct sas_internal *i = to_sas_internal(core->shost->transportt); |
| |
| spin_lock_irqsave(&core->task_queue_lock, flags); |
| while (!kthread_should_stop() && |
| !list_empty(&core->task_queue)) { |
| |
| can_queue = sas_ha->lldd_queue_size - core->task_queue_size; |
| if (can_queue >= 0) { |
| can_queue = core->task_queue_size; |
| list_splice_init(&core->task_queue, &q); |
| } else { |
| struct list_head *a, *n; |
| |
| can_queue = sas_ha->lldd_queue_size; |
| list_for_each_safe(a, n, &core->task_queue) { |
| list_move_tail(a, &q); |
| if (--can_queue == 0) |
| break; |
| } |
| can_queue = sas_ha->lldd_queue_size; |
| } |
| core->task_queue_size -= can_queue; |
| spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| { |
| struct sas_task *task = list_entry(q.next, |
| struct sas_task, |
| list); |
| list_del_init(&q); |
| res = i->dft->lldd_execute_task(task, can_queue, |
| GFP_KERNEL); |
| if (unlikely(res)) |
| __list_add(&q, task->list.prev, &task->list); |
| } |
| spin_lock_irqsave(&core->task_queue_lock, flags); |
| if (res) { |
| list_splice_init(&q, &core->task_queue); /*at head*/ |
| core->task_queue_size += can_queue; |
| } |
| } |
| spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| } |
| |
| /** |
| * sas_queue_thread -- The Task Collector thread |
| * @_sas_ha: pointer to struct sas_ha |
| */ |
| static int sas_queue_thread(void *_sas_ha) |
| { |
| struct sas_ha_struct *sas_ha = _sas_ha; |
| |
| while (1) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| schedule(); |
| sas_queue(sas_ha); |
| if (kthread_should_stop()) |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int sas_init_queue(struct sas_ha_struct *sas_ha) |
| { |
| struct scsi_core *core = &sas_ha->core; |
| |
| spin_lock_init(&core->task_queue_lock); |
| core->task_queue_size = 0; |
| INIT_LIST_HEAD(&core->task_queue); |
| |
| core->queue_thread = kthread_run(sas_queue_thread, sas_ha, |
| "sas_queue_%d", core->shost->host_no); |
| if (IS_ERR(core->queue_thread)) |
| return PTR_ERR(core->queue_thread); |
| return 0; |
| } |
| |
| void sas_shutdown_queue(struct sas_ha_struct *sas_ha) |
| { |
| unsigned long flags; |
| struct scsi_core *core = &sas_ha->core; |
| struct sas_task *task, *n; |
| |
| kthread_stop(core->queue_thread); |
| |
| if (!list_empty(&core->task_queue)) |
| SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n", |
| SAS_ADDR(sas_ha->sas_addr)); |
| |
| spin_lock_irqsave(&core->task_queue_lock, flags); |
| list_for_each_entry_safe(task, n, &core->task_queue, list) { |
| struct scsi_cmnd *cmd = task->uldd_task; |
| |
| list_del_init(&task->list); |
| |
| ASSIGN_SAS_TASK(cmd, NULL); |
| sas_free_task(task); |
| cmd->result = DID_ABORT << 16; |
| cmd->scsi_done(cmd); |
| } |
| spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| } |
| |
| /* |
| * Call the LLDD task abort routine directly. This function is intended for |
| * use by upper layers that need to tell the LLDD to abort a task. |
| */ |
| int __sas_task_abort(struct sas_task *task) |
| { |
| struct sas_internal *si = |
| to_sas_internal(task->dev->port->ha->core.shost->transportt); |
| unsigned long flags; |
| int res; |
| |
| spin_lock_irqsave(&task->task_state_lock, flags); |
| if (task->task_state_flags & SAS_TASK_STATE_ABORTED || |
| task->task_state_flags & SAS_TASK_STATE_DONE) { |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| SAS_DPRINTK("%s: Task %p already finished.\n", __func__, |
| task); |
| return 0; |
| } |
| task->task_state_flags |= SAS_TASK_STATE_ABORTED; |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| |
| if (!si->dft->lldd_abort_task) |
| return -ENODEV; |
| |
| res = si->dft->lldd_abort_task(task); |
| |
| spin_lock_irqsave(&task->task_state_lock, flags); |
| if ((task->task_state_flags & SAS_TASK_STATE_DONE) || |
| (res == TMF_RESP_FUNC_COMPLETE)) |
| { |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| task->task_done(task); |
| return 0; |
| } |
| |
| if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) |
| task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| |
| return -EAGAIN; |
| } |
| |
| /* |
| * Tell an upper layer that it needs to initiate an abort for a given task. |
| * This should only ever be called by an LLDD. |
| */ |
| void sas_task_abort(struct sas_task *task) |
| { |
| struct scsi_cmnd *sc = task->uldd_task; |
| struct request_queue *q = sc->device->request_queue; |
| unsigned long flags; |
| |
| /* Escape for libsas internal commands */ |
| if (!sc) { |
| if (!del_timer(&task->timer)) |
| return; |
| task->timer.function(task->timer.data); |
| return; |
| } |
| |
| if (dev_is_sata(task->dev)) { |
| sas_ata_task_abort(task); |
| return; |
| } |
| |
| spin_lock_irqsave(q->queue_lock, flags); |
| blk_abort_request(sc->request); |
| spin_unlock_irqrestore(q->queue_lock, flags); |
| scsi_schedule_eh(sc->device->host); |
| } |
| |
| int sas_slave_alloc(struct scsi_device *scsi_dev) |
| { |
| struct domain_device *dev = sdev_to_domain_dev(scsi_dev); |
| |
| if (dev_is_sata(dev)) |
| return ata_sas_port_init(dev->sata_dev.ap); |
| |
| return 0; |
| } |
| |
| void sas_target_destroy(struct scsi_target *starget) |
| { |
| struct domain_device *found_dev = sas_find_target(starget); |
| |
| if (!found_dev) |
| return; |
| |
| if (dev_is_sata(found_dev)) |
| ata_sas_port_destroy(found_dev->sata_dev.ap); |
| |
| return; |
| } |
| |
| static void sas_parse_addr(u8 *sas_addr, const char *p) |
| { |
| int i; |
| for (i = 0; i < SAS_ADDR_SIZE; i++) { |
| u8 h, l; |
| if (!*p) |
| break; |
| h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; |
| p++; |
| l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10; |
| p++; |
| sas_addr[i] = (h<<4) | l; |
| } |
| } |
| |
| #define SAS_STRING_ADDR_SIZE 16 |
| |
| int sas_request_addr(struct Scsi_Host *shost, u8 *addr) |
| { |
| int res; |
| const struct firmware *fw; |
| |
| res = request_firmware(&fw, "sas_addr", &shost->shost_gendev); |
| if (res) |
| return res; |
| |
| if (fw->size < SAS_STRING_ADDR_SIZE) { |
| res = -ENODEV; |
| goto out; |
| } |
| |
| sas_parse_addr(addr, fw->data); |
| |
| out: |
| release_firmware(fw); |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(sas_request_addr); |
| |
| EXPORT_SYMBOL_GPL(sas_queuecommand); |
| EXPORT_SYMBOL_GPL(sas_target_alloc); |
| EXPORT_SYMBOL_GPL(sas_slave_configure); |
| EXPORT_SYMBOL_GPL(sas_slave_destroy); |
| EXPORT_SYMBOL_GPL(sas_change_queue_depth); |
| EXPORT_SYMBOL_GPL(sas_change_queue_type); |
| EXPORT_SYMBOL_GPL(sas_bios_param); |
| EXPORT_SYMBOL_GPL(__sas_task_abort); |
| EXPORT_SYMBOL_GPL(sas_task_abort); |
| EXPORT_SYMBOL_GPL(sas_phy_reset); |
| EXPORT_SYMBOL_GPL(sas_phy_enable); |
| EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler); |
| EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler); |
| EXPORT_SYMBOL_GPL(sas_slave_alloc); |
| EXPORT_SYMBOL_GPL(sas_target_destroy); |
| EXPORT_SYMBOL_GPL(sas_ioctl); |