| /* |
| * 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 <linux/export.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.class == ATA_DEV_ATAPI))) { |
| memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE); |
| |
| if (!link->sactive) { |
| qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]); |
| } else { |
| link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]); |
| 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.fis[3] = 0x04; /* status err */ |
| dev->sata_dev.fis[2] = ATA_ERR; |
| } |
| } |
| |
| qc->lldd_task = NULL; |
| ata_qc_complete(qc); |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| qc_already_gone: |
| sas_free_task(task); |
| } |
| |
| static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) |
| { |
| 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: we should try to remove that unlock */ |
| 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 || |
| qc->tf.command == ATA_CMD_FPDMA_RECV || |
| qc->tf.command == ATA_CMD_FPDMA_SEND || |
| qc->tf.command == ATA_CMD_NCQ_NON_DATA) { |
| /* Need to zero out the tag libata assigned us */ |
| qc->tf.nsect = 0; |
| } |
| |
| ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (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; |
| task->data_dir = qc->dma_dir; |
| } else if (!ata_is_data(qc->tf.protocol)) { |
| task->data_dir = DMA_NONE; |
| } else { |
| for_each_sg(qc->sg, sg, qc->n_elem, si) |
| xfer += sg_dma_len(sg); |
| |
| 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; |
| |
| task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol); |
| task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol); |
| |
| if (qc->scsicmd) |
| ASSIGN_SAS_TASK(qc->scsicmd, task); |
| |
| ret = i->dft->lldd_execute_task(task, GFP_ATOMIC); |
| if (ret) { |
| SAS_DPRINTK("lldd_execute_task returned: %d\n", ret); |
| |
| if (qc->scsicmd) |
| ASSIGN_SAS_TASK(qc->scsicmd, NULL); |
| sas_free_task(task); |
| qc->lldd_task = NULL; |
| ret = AC_ERR_SYSTEM; |
| } |
| |
| out: |
| spin_lock(ap->lock); |
| return ret; |
| } |
| |
| static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) |
| { |
| struct domain_device *dev = qc->ap->private_data; |
| |
| ata_tf_from_fis(dev->sata_dev.fis, &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 sas_get_ata_command_set(struct domain_device *dev); |
| |
| int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy) |
| { |
| if (phy->attached_tproto & SAS_PROTOCOL_STP) |
| dev->tproto = phy->attached_tproto; |
| if (phy->attached_sata_dev) |
| dev->tproto |= SAS_SATA_DEV; |
| |
| if (phy->attached_dev_type == SAS_SATA_PENDING) |
| dev->dev_type = SAS_SATA_PENDING; |
| else { |
| int res; |
| |
| dev->dev_type = SAS_SATA_DEV; |
| res = sas_get_report_phy_sata(dev->parent, phy->phy_id, |
| &dev->sata_dev.rps_resp); |
| if (res) { |
| SAS_DPRINTK("report phy sata to %016llx:0x%x returned " |
| "0x%x\n", SAS_ADDR(dev->parent->sas_addr), |
| phy->phy_id, res); |
| return res; |
| } |
| memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis, |
| sizeof(struct dev_to_host_fis)); |
| dev->sata_dev.class = sas_get_ata_command_set(dev); |
| } |
| return 0; |
| } |
| |
| static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy) |
| { |
| int res; |
| |
| /* we weren't pending, so successfully end the reset sequence now */ |
| if (dev->dev_type != SAS_SATA_PENDING) |
| return 1; |
| |
| /* hmmm, if this succeeds do we need to repost the domain_device to the |
| * lldd so it can pick up new parameters? |
| */ |
| res = sas_get_ata_info(dev, phy); |
| if (res) |
| return 0; /* retry */ |
| else |
| return 1; |
| } |
| |
| static int smp_ata_check_ready(struct ata_link *link) |
| { |
| int res; |
| 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); |
| struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number]; |
| |
| res = sas_ex_phy_discover(ex_dev, phy->number); |
| 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) |
| return 0; |
| |
| switch (ex_phy->attached_dev_type) { |
| case SAS_SATA_PENDING: |
| return 0; |
| case SAS_END_DEVICE: |
| if (ex_phy->attached_sata_dev) |
| return sas_ata_clear_pending(dev, ex_phy); |
| /* fall through */ |
| default: |
| return -ENODEV; |
| } |
| } |
| |
| 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_printk(const char *level, const struct domain_device *ddev, |
| const char *fmt, ...) |
| { |
| struct ata_port *ap = ddev->sata_dev.ap; |
| struct device *dev = &ddev->rphy->dev; |
| struct va_format vaf; |
| va_list args; |
| int r; |
| |
| va_start(args, fmt); |
| |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| |
| r = printk("%ssas: ata%u: %s: %pV", |
| level, ap->print_id, dev_name(dev), &vaf); |
| |
| va_end(args); |
| |
| return r; |
| } |
| |
| 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); |
| |
| res = i->dft->lldd_I_T_nexus_reset(dev); |
| if (res == -ENODEV) |
| return res; |
| |
| if (res != TMF_RESP_FUNC_COMPLETE) |
| sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n"); |
| |
| 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) |
| sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret); |
| |
| *class = dev->sata_dev.class; |
| |
| 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: |
| 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 void sas_ata_sched_eh(struct ata_port *ap) |
| { |
| struct domain_device *dev = ap->private_data; |
| struct sas_ha_struct *ha = dev->port->ha; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ha->lock, flags); |
| if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state)) |
| ha->eh_active++; |
| ata_std_sched_eh(ap); |
| spin_unlock_irqrestore(&ha->lock, flags); |
| } |
| |
| void sas_ata_end_eh(struct ata_port *ap) |
| { |
| struct domain_device *dev = ap->private_data; |
| struct sas_ha_struct *ha = dev->port->ha; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ha->lock, flags); |
| if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state)) |
| ha->eh_active--; |
| spin_unlock_irqrestore(&ha->lock, flags); |
| } |
| |
| static struct ata_port_operations sas_sata_ops = { |
| .prereset = ata_std_prereset, |
| .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, |
| .sched_eh = sas_ata_sched_eh, |
| .end_eh = sas_ata_end_eh, |
| }; |
| |
| static struct ata_port_info sata_port_info = { |
| .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ | |
| ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX, |
| .pio_mask = ATA_PIO4, |
| .mwdma_mask = ATA_MWDMA2, |
| .udma_mask = ATA_UDMA6, |
| .port_ops = &sas_sata_ops |
| }; |
| |
| int sas_ata_init(struct domain_device *found_dev) |
| { |
| struct sas_ha_struct *ha = found_dev->port->ha; |
| struct Scsi_Host *shost = ha->core.shost; |
| struct ata_host *ata_host; |
| struct ata_port *ap; |
| int rc; |
| |
| ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL); |
| if (!ata_host) { |
| SAS_DPRINTK("ata host alloc failed.\n"); |
| return -ENOMEM; |
| } |
| |
| ata_host_init(ata_host, ha->dev, &sas_sata_ops); |
| |
| ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost); |
| if (!ap) { |
| SAS_DPRINTK("ata_sas_port_alloc failed.\n"); |
| rc = -ENODEV; |
| goto free_host; |
| } |
| |
| ap->private_data = found_dev; |
| ap->cbl = ATA_CBL_SATA; |
| ap->scsi_host = shost; |
| rc = ata_sas_port_init(ap); |
| if (rc) |
| goto destroy_port; |
| |
| rc = ata_sas_tport_add(ata_host->dev, ap); |
| if (rc) |
| goto destroy_port; |
| |
| found_dev->sata_dev.ata_host = ata_host; |
| found_dev->sata_dev.ap = ap; |
| |
| return 0; |
| |
| destroy_port: |
| ata_sas_port_destroy(ap); |
| free_host: |
| ata_host_put(ata_host); |
| return rc; |
| } |
| |
| 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); |
| 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 int sas_get_ata_command_set(struct domain_device *dev) |
| { |
| struct dev_to_host_fis *fis = |
| (struct dev_to_host_fis *) dev->frame_rcvd; |
| struct ata_taskfile tf; |
| |
| if (dev->dev_type == SAS_SATA_PENDING) |
| return ATA_DEV_UNKNOWN; |
| |
| ata_tf_from_fis((const u8 *)fis, &tf); |
| |
| return ata_dev_classify(&tf); |
| } |
| |
| void sas_probe_sata(struct asd_sas_port *port) |
| { |
| struct domain_device *dev, *n; |
| |
| mutex_lock(&port->ha->disco_mutex); |
| list_for_each_entry(dev, &port->disco_list, disco_list_node) { |
| if (!dev_is_sata(dev)) |
| continue; |
| |
| ata_sas_async_probe(dev->sata_dev.ap); |
| } |
| mutex_unlock(&port->ha->disco_mutex); |
| |
| list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { |
| if (!dev_is_sata(dev)) |
| continue; |
| |
| sas_ata_wait_eh(dev); |
| |
| /* if libata could not bring the link up, don't surface |
| * the device |
| */ |
| if (ata_dev_disabled(sas_to_ata_dev(dev))) |
| sas_fail_probe(dev, __func__, -ENODEV); |
| } |
| |
| } |
| |
| static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func) |
| { |
| struct domain_device *dev, *n; |
| |
| list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) { |
| if (!dev_is_sata(dev)) |
| continue; |
| |
| sas_ata_wait_eh(dev); |
| |
| /* if libata failed to power manage the device, tear it down */ |
| if (ata_dev_disabled(sas_to_ata_dev(dev))) |
| sas_fail_probe(dev, func, -ENODEV); |
| } |
| } |
| |
| void sas_suspend_sata(struct asd_sas_port *port) |
| { |
| struct domain_device *dev; |
| |
| mutex_lock(&port->ha->disco_mutex); |
| list_for_each_entry(dev, &port->dev_list, dev_list_node) { |
| struct sata_device *sata; |
| |
| if (!dev_is_sata(dev)) |
| continue; |
| |
| sata = &dev->sata_dev; |
| if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND) |
| continue; |
| |
| ata_sas_port_suspend(sata->ap); |
| } |
| mutex_unlock(&port->ha->disco_mutex); |
| |
| sas_ata_flush_pm_eh(port, __func__); |
| } |
| |
| void sas_resume_sata(struct asd_sas_port *port) |
| { |
| struct domain_device *dev; |
| |
| mutex_lock(&port->ha->disco_mutex); |
| list_for_each_entry(dev, &port->dev_list, dev_list_node) { |
| struct sata_device *sata; |
| |
| if (!dev_is_sata(dev)) |
| continue; |
| |
| sata = &dev->sata_dev; |
| if (sata->ap->pm_mesg.event == PM_EVENT_ON) |
| continue; |
| |
| ata_sas_port_resume(sata->ap); |
| } |
| mutex_unlock(&port->ha->disco_mutex); |
| |
| sas_ata_flush_pm_eh(port, __func__); |
| } |
| |
| /** |
| * 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 == SAS_SATA_PM) |
| return -ENODEV; |
| |
| dev->sata_dev.class = sas_get_ata_command_set(dev); |
| sas_fill_in_rphy(dev, dev->rphy); |
| |
| res = sas_notify_lldd_dev_found(dev); |
| if (res) |
| return res; |
| |
| 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; |
| |
| sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n"); |
| ata_scsi_port_error_handler(ha->core.shost, ap); |
| sas_put_device(dev); |
| } |
| |
| void sas_ata_strategy_handler(struct Scsi_Host *shost) |
| { |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
| ASYNC_DOMAIN_EXCLUSIVE(async); |
| int i; |
| |
| /* 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); |
| |
| spin_lock_irq(&sas_ha->phy_port_lock); |
| for (i = 0; i < sas_ha->num_phys; i++) { |
| struct asd_sas_port *port = sas_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 (!dev_is_sata(dev)) |
| continue; |
| |
| /* hold a reference over eh since we may be |
| * racing with final remove once all commands |
| * are completed |
| */ |
| kref_get(&dev->kref); |
| |
| async_schedule_domain(async_sas_ata_eh, dev, &async); |
| } |
| spin_unlock(&port->dev_list_lock); |
| } |
| spin_unlock_irq(&sas_ha->phy_port_lock); |
| |
| async_synchronize_full_domain(&async); |
| |
| sas_enable_revalidation(sas_ha); |
| } |
| |
| void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, |
| struct list_head *done_q) |
| { |
| struct scsi_cmnd *cmd, *n; |
| struct domain_device *eh_dev; |
| |
| do { |
| LIST_HEAD(sata_q); |
| eh_dev = 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 (eh_dev && eh_dev != ddev) |
| continue; |
| eh_dev = ddev; |
| list_move(&cmd->eh_entry, &sata_q); |
| } |
| |
| if (!list_empty(&sata_q)) { |
| struct ata_port *ap = eh_dev->sata_dev.ap; |
| |
| sas_ata_printk(KERN_DEBUG, eh_dev, "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 (eh_dev); |
| } |
| |
| 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); |
| } |
| EXPORT_SYMBOL_GPL(sas_ata_schedule_reset); |
| |
| 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); |
| } |