| /* |
| * Support for SATA devices on Serial Attached SCSI (SAS) controllers |
| * |
| * Copyright (C) 2006 IBM Corporation |
| * |
| * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation |
| * |
| * 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/scatterlist.h> |
| #include <linux/slab.h> |
| #include <linux/async.h> |
| |
| #include <scsi/sas_ata.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_transport.h> |
| #include <scsi/scsi_transport_sas.h> |
| #include "../scsi_sas_internal.h" |
| #include "../scsi_transport_api.h" |
| #include <scsi/scsi_eh.h> |
| |
| static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts) |
| { |
| /* Cheesy attempt to translate SAS errors into ATA. Hah! */ |
| |
| /* transport error */ |
| if (ts->resp == SAS_TASK_UNDELIVERED) |
| return AC_ERR_ATA_BUS; |
| |
| /* ts->resp == SAS_TASK_COMPLETE */ |
| /* task delivered, what happened afterwards? */ |
| switch (ts->stat) { |
| case SAS_DEV_NO_RESPONSE: |
| return AC_ERR_TIMEOUT; |
| |
| case SAS_INTERRUPTED: |
| case SAS_PHY_DOWN: |
| case SAS_NAK_R_ERR: |
| return AC_ERR_ATA_BUS; |
| |
| |
| case SAS_DATA_UNDERRUN: |
| /* |
| * Some programs that use the taskfile interface |
| * (smartctl in particular) can cause underrun |
| * problems. Ignore these errors, perhaps at our |
| * peril. |
| */ |
| return 0; |
| |
| case SAS_DATA_OVERRUN: |
| case SAS_QUEUE_FULL: |
| case SAS_DEVICE_UNKNOWN: |
| case SAS_SG_ERR: |
| return AC_ERR_INVALID; |
| |
| case SAS_OPEN_TO: |
| case SAS_OPEN_REJECT: |
| SAS_DPRINTK("%s: Saw error %d. What to do?\n", |
| __func__, ts->stat); |
| return AC_ERR_OTHER; |
| |
| case SAM_STAT_CHECK_CONDITION: |
| case SAS_ABORTED_TASK: |
| return AC_ERR_DEV; |
| |
| case SAS_PROTO_RESPONSE: |
| /* This means the ending_fis has the error |
| * value; return 0 here to collect it */ |
| return 0; |
| default: |
| return 0; |
| } |
| } |
| |
| static void sas_ata_task_done(struct sas_task *task) |
| { |
| struct ata_queued_cmd *qc = task->uldd_task; |
| struct domain_device *dev = task->dev; |
| struct task_status_struct *stat = &task->task_status; |
| struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf; |
| struct sas_ha_struct *sas_ha = dev->port->ha; |
| enum ata_completion_errors ac; |
| unsigned long flags; |
| struct ata_link *link; |
| struct ata_port *ap; |
| |
| spin_lock_irqsave(&dev->done_lock, flags); |
| if (test_bit(SAS_HA_FROZEN, &sas_ha->state)) |
| task = NULL; |
| else if (qc && qc->scsicmd) |
| ASSIGN_SAS_TASK(qc->scsicmd, NULL); |
| spin_unlock_irqrestore(&dev->done_lock, flags); |
| |
| /* check if libsas-eh got to the task before us */ |
| if (unlikely(!task)) |
| return; |
| |
| if (!qc) |
| goto qc_already_gone; |
| |
| ap = qc->ap; |
| link = &ap->link; |
| |
| spin_lock_irqsave(ap->lock, flags); |
| /* check if we lost the race with libata/sas_ata_post_internal() */ |
| if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) { |
| spin_unlock_irqrestore(ap->lock, flags); |
| if (qc->scsicmd) |
| goto qc_already_gone; |
| else { |
| /* if eh is not involved and the port is frozen then the |
| * ata internal abort process has taken responsibility |
| * for this sas_task |
| */ |
| return; |
| } |
| } |
| |
| if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD || |
| ((stat->stat == SAM_STAT_CHECK_CONDITION && |
| dev->sata_dev.command_set == ATAPI_COMMAND_SET))) { |
| ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf); |
| |
| if (!link->sactive) { |
| qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command); |
| } else { |
| link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command); |
| if (unlikely(link->eh_info.err_mask)) |
| qc->flags |= ATA_QCFLAG_FAILED; |
| } |
| } else { |
| ac = sas_to_ata_err(stat); |
| if (ac) { |
| SAS_DPRINTK("%s: SAS error %x\n", __func__, |
| stat->stat); |
| /* We saw a SAS error. Send a vague error. */ |
| if (!link->sactive) { |
| qc->err_mask = ac; |
| } else { |
| link->eh_info.err_mask |= AC_ERR_DEV; |
| qc->flags |= ATA_QCFLAG_FAILED; |
| } |
| |
| dev->sata_dev.tf.feature = 0x04; /* status err */ |
| dev->sata_dev.tf.command = ATA_ERR; |
| } |
| } |
| |
| qc->lldd_task = NULL; |
| ata_qc_complete(qc); |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| qc_already_gone: |
| list_del_init(&task->list); |
| sas_free_task(task); |
| } |
| |
| static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) |
| { |
| unsigned long flags; |
| struct sas_task *task; |
| struct scatterlist *sg; |
| int ret = AC_ERR_SYSTEM; |
| unsigned int si, xfer = 0; |
| struct ata_port *ap = qc->ap; |
| struct domain_device *dev = ap->private_data; |
| struct sas_ha_struct *sas_ha = dev->port->ha; |
| struct Scsi_Host *host = sas_ha->core.shost; |
| struct sas_internal *i = to_sas_internal(host->transportt); |
| |
| /* TODO: audit callers to ensure they are ready for qc_issue to |
| * unconditionally re-enable interrupts |
| */ |
| local_irq_save(flags); |
| spin_unlock(ap->lock); |
| |
| /* If the device fell off, no sense in issuing commands */ |
| if (test_bit(SAS_DEV_GONE, &dev->state)) |
| goto out; |
| |
| task = sas_alloc_task(GFP_ATOMIC); |
| if (!task) |
| goto out; |
| task->dev = dev; |
| task->task_proto = SAS_PROTOCOL_STP; |
| task->task_done = sas_ata_task_done; |
| |
| if (qc->tf.command == ATA_CMD_FPDMA_WRITE || |
| qc->tf.command == ATA_CMD_FPDMA_READ) { |
| /* Need to zero out the tag libata assigned us */ |
| qc->tf.nsect = 0; |
| } |
| |
| ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis); |
| task->uldd_task = qc; |
| if (ata_is_atapi(qc->tf.protocol)) { |
| memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); |
| task->total_xfer_len = qc->nbytes; |
| task->num_scatter = qc->n_elem; |
| } else { |
| for_each_sg(qc->sg, sg, qc->n_elem, si) |
| xfer += sg->length; |
| |
| task->total_xfer_len = xfer; |
| task->num_scatter = si; |
| } |
| |
| task->data_dir = qc->dma_dir; |
| task->scatter = qc->sg; |
| task->ata_task.retry_count = 1; |
| task->task_state_flags = SAS_TASK_STATE_PENDING; |
| qc->lldd_task = task; |
| |
| switch (qc->tf.protocol) { |
| case ATA_PROT_NCQ: |
| task->ata_task.use_ncq = 1; |
| /* fall through */ |
| case ATAPI_PROT_DMA: |
| case ATA_PROT_DMA: |
| task->ata_task.dma_xfer = 1; |
| break; |
| } |
| |
| if (qc->scsicmd) |
| ASSIGN_SAS_TASK(qc->scsicmd, task); |
| |
| if (sas_ha->lldd_max_execute_num < 2) |
| ret = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); |
| else |
| ret = sas_queue_up(task); |
| |
| /* Examine */ |
| if (ret) { |
| SAS_DPRINTK("lldd_execute_task returned: %d\n", ret); |
| |
| if (qc->scsicmd) |
| ASSIGN_SAS_TASK(qc->scsicmd, NULL); |
| sas_free_task(task); |
| ret = AC_ERR_SYSTEM; |
| } |
| |
| out: |
| spin_lock(ap->lock); |
| local_irq_restore(flags); |
| return ret; |
| } |
| |
| static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) |
| { |
| struct domain_device *dev = qc->ap->private_data; |
| |
| memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf)); |
| return true; |
| } |
| |
| static struct sas_internal *dev_to_sas_internal(struct domain_device *dev) |
| { |
| return to_sas_internal(dev->port->ha->core.shost->transportt); |
| } |
| |
| static int smp_ata_check_ready(struct ata_link *link) |
| { |
| int res; |
| u8 addr[8]; |
| struct ata_port *ap = link->ap; |
| struct domain_device *dev = ap->private_data; |
| struct domain_device *ex_dev = dev->parent; |
| struct sas_phy *phy = sas_get_local_phy(dev); |
| |
| res = sas_get_phy_attached_sas_addr(ex_dev, phy->number, addr); |
| sas_put_local_phy(phy); |
| /* break the wait early if the expander is unreachable, |
| * otherwise keep polling |
| */ |
| if (res == -ECOMM) |
| return res; |
| if (res != SMP_RESP_FUNC_ACC || SAS_ADDR(addr) == 0) |
| return 0; |
| else |
| return 1; |
| } |
| |
| static int local_ata_check_ready(struct ata_link *link) |
| { |
| struct ata_port *ap = link->ap; |
| struct domain_device *dev = ap->private_data; |
| struct sas_internal *i = dev_to_sas_internal(dev); |
| |
| if (i->dft->lldd_ata_check_ready) |
| return i->dft->lldd_ata_check_ready(dev); |
| else { |
| /* lldd's that don't implement 'ready' checking get the |
| * old default behavior of not coordinating reset |
| * recovery with libata |
| */ |
| return 1; |
| } |
| } |
| |
| static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class, |
| unsigned long deadline) |
| { |
| int ret = 0, res; |
| struct sas_phy *phy; |
| struct ata_port *ap = link->ap; |
| int (*check_ready)(struct ata_link *link); |
| struct domain_device *dev = ap->private_data; |
| struct sas_internal *i = dev_to_sas_internal(dev); |
| |
| if (test_bit(SAS_DEV_GONE, &dev->state)) |
| return -ENODEV; |
| |
| res = i->dft->lldd_I_T_nexus_reset(dev); |
| |
| if (res != TMF_RESP_FUNC_COMPLETE) |
| SAS_DPRINTK("%s: Unable to reset ata device?\n", __func__); |
| |
| phy = sas_get_local_phy(dev); |
| if (scsi_is_sas_phy_local(phy)) |
| check_ready = local_ata_check_ready; |
| else |
| check_ready = smp_ata_check_ready; |
| sas_put_local_phy(phy); |
| |
| ret = ata_wait_after_reset(link, deadline, check_ready); |
| if (ret && ret != -EAGAIN) |
| ata_link_err(link, "COMRESET failed (errno=%d)\n", ret); |
| |
| /* XXX: if the class changes during the reset the upper layer |
| * should be informed, if the device has gone away we assume |
| * libsas will eventually delete it |
| */ |
| switch (dev->sata_dev.command_set) { |
| case ATA_COMMAND_SET: |
| *class = ATA_DEV_ATA; |
| break; |
| case ATAPI_COMMAND_SET: |
| *class = ATA_DEV_ATAPI; |
| break; |
| } |
| |
| ap->cbl = ATA_CBL_SATA; |
| return ret; |
| } |
| |
| static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class, |
| unsigned long deadline) |
| { |
| struct ata_port *ap = link->ap; |
| struct domain_device *dev = ap->private_data; |
| struct sas_internal *i = dev_to_sas_internal(dev); |
| int res = TMF_RESP_FUNC_FAILED; |
| int ret = 0; |
| |
| if (i->dft->lldd_ata_soft_reset) |
| res = i->dft->lldd_ata_soft_reset(dev); |
| |
| if (res != TMF_RESP_FUNC_COMPLETE) { |
| SAS_DPRINTK("%s: Unable to soft reset\n", __func__); |
| ret = -EAGAIN; |
| } |
| |
| switch (dev->sata_dev.command_set) { |
| case ATA_COMMAND_SET: |
| SAS_DPRINTK("%s: Found ATA device.\n", __func__); |
| *class = ATA_DEV_ATA; |
| break; |
| case ATAPI_COMMAND_SET: |
| SAS_DPRINTK("%s: Found ATAPI device.\n", __func__); |
| *class = ATA_DEV_ATAPI; |
| break; |
| default: |
| SAS_DPRINTK("%s: Unknown SATA command set: %d.\n", |
| __func__, dev->sata_dev.command_set); |
| *class = ATA_DEV_UNKNOWN; |
| break; |
| } |
| |
| ap->cbl = ATA_CBL_SATA; |
| return ret; |
| } |
| |
| /* |
| * notify the lldd to forget the sas_task for this internal ata command |
| * that bypasses scsi-eh |
| */ |
| static void sas_ata_internal_abort(struct sas_task *task) |
| { |
| struct sas_internal *si = dev_to_sas_internal(task->dev); |
| 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); |
| goto out; |
| } |
| task->task_state_flags |= SAS_TASK_STATE_ABORTED; |
| spin_unlock_irqrestore(&task->task_state_lock, flags); |
| |
| 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); |
| goto out; |
| } |
| |
| /* XXX we are not prepared to deal with ->lldd_abort_task() |
| * failures. TODO: lldds need to unconditionally forget about |
| * aborted ata tasks, otherwise we (likely) leak the sas task |
| * here |
| */ |
| SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task); |
| |
| 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; |
| out: |
| list_del_init(&task->list); |
| sas_free_task(task); |
| } |
| |
| static void sas_ata_post_internal(struct ata_queued_cmd *qc) |
| { |
| if (qc->flags & ATA_QCFLAG_FAILED) |
| qc->err_mask |= AC_ERR_OTHER; |
| |
| if (qc->err_mask) { |
| /* |
| * Find the sas_task and kill it. By this point, libata |
| * has decided to kill the qc and has frozen the port. |
| * In this state sas_ata_task_done() will no longer free |
| * the sas_task, so we need to notify the lldd (via |
| * ->lldd_abort_task) that the task is dead and free it |
| * ourselves. |
| */ |
| struct sas_task *task = qc->lldd_task; |
| |
| qc->lldd_task = NULL; |
| if (!task) |
| return; |
| task->uldd_task = NULL; |
| sas_ata_internal_abort(task); |
| } |
| } |
| |
| |
| static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev) |
| { |
| struct domain_device *dev = ap->private_data; |
| struct sas_internal *i = dev_to_sas_internal(dev); |
| |
| if (i->dft->lldd_ata_set_dmamode) |
| i->dft->lldd_ata_set_dmamode(dev); |
| } |
| |
| static struct ata_port_operations sas_sata_ops = { |
| .prereset = ata_std_prereset, |
| .softreset = sas_ata_soft_reset, |
| .hardreset = sas_ata_hard_reset, |
| .postreset = ata_std_postreset, |
| .error_handler = ata_std_error_handler, |
| .post_internal_cmd = sas_ata_post_internal, |
| .qc_defer = ata_std_qc_defer, |
| .qc_prep = ata_noop_qc_prep, |
| .qc_issue = sas_ata_qc_issue, |
| .qc_fill_rtf = sas_ata_qc_fill_rtf, |
| .port_start = ata_sas_port_start, |
| .port_stop = ata_sas_port_stop, |
| .set_dmamode = sas_ata_set_dmamode, |
| }; |
| |
| static struct ata_port_info sata_port_info = { |
| .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ, |
| .pio_mask = ATA_PIO4, |
| .mwdma_mask = ATA_MWDMA2, |
| .udma_mask = ATA_UDMA6, |
| .port_ops = &sas_sata_ops |
| }; |
| |
| int sas_ata_init_host_and_port(struct domain_device *found_dev, |
| struct scsi_target *starget) |
| { |
| struct Scsi_Host *shost = dev_to_shost(&starget->dev); |
| struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| struct ata_port *ap; |
| |
| ata_host_init(&found_dev->sata_dev.ata_host, |
| ha->dev, |
| sata_port_info.flags, |
| &sas_sata_ops); |
| ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, |
| &sata_port_info, |
| shost); |
| if (!ap) { |
| SAS_DPRINTK("ata_sas_port_alloc failed.\n"); |
| return -ENODEV; |
| } |
| |
| ap->private_data = found_dev; |
| ap->cbl = ATA_CBL_SATA; |
| ap->scsi_host = shost; |
| found_dev->sata_dev.ap = ap; |
| |
| return 0; |
| } |
| |
| void sas_ata_task_abort(struct sas_task *task) |
| { |
| struct ata_queued_cmd *qc = task->uldd_task; |
| struct completion *waiting; |
| |
| /* Bounce SCSI-initiated commands to the SCSI EH */ |
| if (qc->scsicmd) { |
| struct request_queue *q = qc->scsicmd->device->request_queue; |
| unsigned long flags; |
| |
| spin_lock_irqsave(q->queue_lock, flags); |
| blk_abort_request(qc->scsicmd->request); |
| spin_unlock_irqrestore(q->queue_lock, flags); |
| scsi_schedule_eh(qc->scsicmd->device->host); |
| return; |
| } |
| |
| /* Internal command, fake a timeout and complete. */ |
| qc->flags &= ~ATA_QCFLAG_ACTIVE; |
| qc->flags |= ATA_QCFLAG_FAILED; |
| qc->err_mask |= AC_ERR_TIMEOUT; |
| waiting = qc->private_data; |
| complete(waiting); |
| } |
| |
| static void sas_get_ata_command_set(struct domain_device *dev) |
| { |
| struct dev_to_host_fis *fis = |
| (struct dev_to_host_fis *) dev->frame_rcvd; |
| |
| if ((fis->sector_count == 1 && /* ATA */ |
| fis->lbal == 1 && |
| fis->lbam == 0 && |
| fis->lbah == 0 && |
| fis->device == 0) |
| || |
| (fis->sector_count == 0 && /* CE-ATA (mATA) */ |
| fis->lbal == 0 && |
| fis->lbam == 0xCE && |
| fis->lbah == 0xAA && |
| (fis->device & ~0x10) == 0)) |
| |
| dev->sata_dev.command_set = ATA_COMMAND_SET; |
| |
| else if ((fis->interrupt_reason == 1 && /* ATAPI */ |
| fis->lbal == 1 && |
| fis->byte_count_low == 0x14 && |
| fis->byte_count_high == 0xEB && |
| (fis->device & ~0x10) == 0)) |
| |
| dev->sata_dev.command_set = ATAPI_COMMAND_SET; |
| |
| else if ((fis->sector_count == 1 && /* SEMB */ |
| fis->lbal == 1 && |
| fis->lbam == 0x3C && |
| fis->lbah == 0xC3 && |
| fis->device == 0) |
| || |
| (fis->interrupt_reason == 1 && /* SATA PM */ |
| fis->lbal == 1 && |
| fis->byte_count_low == 0x69 && |
| fis->byte_count_high == 0x96 && |
| (fis->device & ~0x10) == 0)) |
| |
| /* Treat it as a superset? */ |
| dev->sata_dev.command_set = ATAPI_COMMAND_SET; |
| } |
| |
| void sas_probe_sata(struct work_struct *work) |
| { |
| struct domain_device *dev, *n; |
| struct sas_discovery_event *ev = |
| container_of(work, struct sas_discovery_event, work); |
| struct asd_sas_port *port = ev->port; |
| |
| clear_bit(DISCE_PROBE, &port->disc.pending); |
| |
| list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { |
| int err; |
| |
| spin_lock_irq(&port->dev_list_lock); |
| list_add_tail(&dev->dev_list_node, &port->dev_list); |
| spin_unlock_irq(&port->dev_list_lock); |
| |
| err = sas_rphy_add(dev->rphy); |
| |
| if (err) { |
| SAS_DPRINTK("%s: for %s device %16llx returned %d\n", |
| __func__, dev->parent ? "exp-attached" : |
| "direct-attached", |
| SAS_ADDR(dev->sas_addr), err); |
| sas_unregister_dev(port, dev); |
| } else |
| list_del_init(&dev->disco_list_node); |
| } |
| } |
| |
| /** |
| * sas_discover_sata -- discover an STP/SATA domain device |
| * @dev: pointer to struct domain_device of interest |
| * |
| * Devices directly attached to a HA port, have no parents. All other |
| * devices do, and should have their "parent" pointer set appropriately |
| * before calling this function. |
| */ |
| int sas_discover_sata(struct domain_device *dev) |
| { |
| int res; |
| |
| if (dev->dev_type == SATA_PM) |
| return -ENODEV; |
| |
| sas_get_ata_command_set(dev); |
| sas_fill_in_rphy(dev, dev->rphy); |
| |
| res = sas_notify_lldd_dev_found(dev); |
| if (res) |
| return res; |
| |
| sas_discover_event(dev->port, DISCE_PROBE); |
| return 0; |
| } |
| |
| static void async_sas_ata_eh(void *data, async_cookie_t cookie) |
| { |
| struct domain_device *dev = data; |
| struct ata_port *ap = dev->sata_dev.ap; |
| struct sas_ha_struct *ha = dev->port->ha; |
| |
| ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler"); |
| ata_scsi_port_error_handler(ha->core.shost, ap); |
| } |
| |
| void sas_ata_strategy_handler(struct Scsi_Host *shost) |
| { |
| struct scsi_device *sdev; |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
| LIST_HEAD(async); |
| |
| /* it's ok to defer revalidation events during ata eh, these |
| * disks are in one of three states: |
| * 1/ present for initial domain discovery, and these |
| * resets will cause bcn flutters |
| * 2/ hot removed, we'll discover that after eh fails |
| * 3/ hot added after initial discovery, lost the race, and need |
| * to catch the next train. |
| */ |
| sas_disable_revalidation(sas_ha); |
| |
| shost_for_each_device(sdev, shost) { |
| struct domain_device *ddev = sdev_to_domain_dev(sdev); |
| |
| if (!dev_is_sata(ddev)) |
| continue; |
| |
| async_schedule_domain(async_sas_ata_eh, ddev, &async); |
| } |
| async_synchronize_full_domain(&async); |
| |
| sas_enable_revalidation(sas_ha); |
| } |
| |
| int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, |
| struct list_head *done_q) |
| { |
| int rtn = 0; |
| struct scsi_cmnd *cmd, *n; |
| struct ata_port *ap; |
| |
| do { |
| LIST_HEAD(sata_q); |
| |
| ap = NULL; |
| |
| list_for_each_entry_safe(cmd, n, work_q, eh_entry) { |
| struct domain_device *ddev = cmd_to_domain_dev(cmd); |
| |
| if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd)) |
| continue; |
| if (ap && ap != ddev->sata_dev.ap) |
| continue; |
| ap = ddev->sata_dev.ap; |
| rtn = 1; |
| list_move(&cmd->eh_entry, &sata_q); |
| } |
| |
| if (!list_empty(&sata_q)) { |
| ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n"); |
| ata_scsi_cmd_error_handler(shost, ap, &sata_q); |
| /* |
| * ata's error handler may leave the cmd on the list |
| * so make sure they don't remain on a stack list |
| * about to go out of scope. |
| * |
| * This looks strange, since the commands are |
| * now part of no list, but the next error |
| * action will be ata_port_error_handler() |
| * which takes no list and sweeps them up |
| * anyway from the ata tag array. |
| */ |
| while (!list_empty(&sata_q)) |
| list_del_init(sata_q.next); |
| } |
| } while (ap); |
| |
| return rtn; |
| } |
| |
| void sas_ata_schedule_reset(struct domain_device *dev) |
| { |
| struct ata_eh_info *ehi; |
| struct ata_port *ap; |
| unsigned long flags; |
| |
| if (!dev_is_sata(dev)) |
| return; |
| |
| ap = dev->sata_dev.ap; |
| ehi = &ap->link.eh_info; |
| |
| spin_lock_irqsave(ap->lock, flags); |
| ehi->err_mask |= AC_ERR_TIMEOUT; |
| ehi->action |= ATA_EH_RESET; |
| ata_port_schedule_eh(ap); |
| spin_unlock_irqrestore(ap->lock, flags); |
| } |
| |
| void sas_ata_wait_eh(struct domain_device *dev) |
| { |
| struct ata_port *ap; |
| |
| if (!dev_is_sata(dev)) |
| return; |
| |
| ap = dev->sata_dev.ap; |
| ata_port_wait_eh(ap); |
| } |