--- /dev/null
+/*
+ * libata-eh.c - libata error handling
+ *
+ * Maintained by: Jeff Garzik <jgarzik@pobox.com>
+ * Please ALWAYS copy linux-ide@vger.kernel.org
+ * on emails.
+ *
+ * Copyright 2006 Tejun Heo <htejun@gmail.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; either version 2, 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ *
+ *
+ * libata documentation is available via 'make {ps|pdf}docs',
+ * as Documentation/DocBook/libata.*
+ *
+ * Hardware documentation available from http://www.t13.org/ and
+ * http://www.sata-io.org/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include "../scsi/scsi_transport_api.h"
+
+#include <linux/libata.h>
+
+#include "libata.h"
+
+static void __ata_port_freeze(struct ata_port *ap);
+static void ata_eh_finish(struct ata_port *ap);
+static void ata_eh_handle_port_suspend(struct ata_port *ap);
+static void ata_eh_handle_port_resume(struct ata_port *ap);
+
+static void ata_ering_record(struct ata_ering *ering, int is_io,
+ unsigned int err_mask)
+{
+ struct ata_ering_entry *ent;
+
+ WARN_ON(!err_mask);
+
+ ering->cursor++;
+ ering->cursor %= ATA_ERING_SIZE;
+
+ ent = &ering->ring[ering->cursor];
+ ent->is_io = is_io;
+ ent->err_mask = err_mask;
+ ent->timestamp = get_jiffies_64();
+}
+
+static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering)
+{
+ struct ata_ering_entry *ent = &ering->ring[ering->cursor];
+ if (!ent->err_mask)
+ return NULL;
+ return ent;
+}
+
+static int ata_ering_map(struct ata_ering *ering,
+ int (*map_fn)(struct ata_ering_entry *, void *),
+ void *arg)
+{
+ int idx, rc = 0;
+ struct ata_ering_entry *ent;
+
+ idx = ering->cursor;
+ do {
+ ent = &ering->ring[idx];
+ if (!ent->err_mask)
+ break;
+ rc = map_fn(ent, arg);
+ if (rc)
+ break;
+ idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
+ } while (idx != ering->cursor);
+
+ return rc;
+}
+
+static unsigned int ata_eh_dev_action(struct ata_device *dev)
+{
+ struct ata_eh_context *ehc = &dev->ap->eh_context;
+
+ return ehc->i.action | ehc->i.dev_action[dev->devno];
+}
+
+static void ata_eh_clear_action(struct ata_device *dev,
+ struct ata_eh_info *ehi, unsigned int action)
+{
+ int i;
+
+ if (!dev) {
+ ehi->action &= ~action;
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ ehi->dev_action[i] &= ~action;
+ } else {
+ /* doesn't make sense for port-wide EH actions */
+ WARN_ON(!(action & ATA_EH_PERDEV_MASK));
+
+ /* break ehi->action into ehi->dev_action */
+ if (ehi->action & action) {
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ ehi->dev_action[i] |= ehi->action & action;
+ ehi->action &= ~action;
+ }
+
+ /* turn off the specified per-dev action */
+ ehi->dev_action[dev->devno] &= ~action;
+ }
+}
+
+/**
+ * ata_scsi_timed_out - SCSI layer time out callback
+ * @cmd: timed out SCSI command
+ *
+ * Handles SCSI layer timeout. We race with normal completion of
+ * the qc for @cmd. If the qc is already gone, we lose and let
+ * the scsi command finish (EH_HANDLED). Otherwise, the qc has
+ * timed out and EH should be invoked. Prevent ata_qc_complete()
+ * from finishing it by setting EH_SCHEDULED and return
+ * EH_NOT_HANDLED.
+ *
+ * TODO: kill this function once old EH is gone.
+ *
+ * LOCKING:
+ * Called from timer context
+ *
+ * RETURNS:
+ * EH_HANDLED or EH_NOT_HANDLED
+ */
+enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
+{
+ struct Scsi_Host *host = cmd->device->host;
+ struct ata_port *ap = ata_shost_to_port(host);
+ unsigned long flags;
+ struct ata_queued_cmd *qc;
+ enum scsi_eh_timer_return ret;
+
+ DPRINTK("ENTER\n");
+
+ if (ap->ops->error_handler) {
+ ret = EH_NOT_HANDLED;
+ goto out;
+ }
+
+ ret = EH_HANDLED;
+ spin_lock_irqsave(ap->lock, flags);
+ qc = ata_qc_from_tag(ap, ap->active_tag);
+ if (qc) {
+ WARN_ON(qc->scsicmd != cmd);
+ qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
+ qc->err_mask |= AC_ERR_TIMEOUT;
+ ret = EH_NOT_HANDLED;
+ }
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ out:
+ DPRINTK("EXIT, ret=%d\n", ret);
+ return ret;
+}
+
+/**
+ * ata_scsi_error - SCSI layer error handler callback
+ * @host: SCSI host on which error occurred
+ *
+ * Handles SCSI-layer-thrown error events.
+ *
+ * LOCKING:
+ * Inherited from SCSI layer (none, can sleep)
+ *
+ * RETURNS:
+ * Zero.
+ */
+void ata_scsi_error(struct Scsi_Host *host)
+{
+ struct ata_port *ap = ata_shost_to_port(host);
+ int i, repeat_cnt = ATA_EH_MAX_REPEAT;
+ unsigned long flags;
+
+ DPRINTK("ENTER\n");
+
+ /* synchronize with port task */
+ ata_port_flush_task(ap);
+
+ /* synchronize with host lock and sort out timeouts */
+
+ /* For new EH, all qcs are finished in one of three ways -
+ * normal completion, error completion, and SCSI timeout.
+ * Both cmpletions can race against SCSI timeout. When normal
+ * completion wins, the qc never reaches EH. When error
+ * completion wins, the qc has ATA_QCFLAG_FAILED set.
+ *
+ * When SCSI timeout wins, things are a bit more complex.
+ * Normal or error completion can occur after the timeout but
+ * before this point. In such cases, both types of
+ * completions are honored. A scmd is determined to have
+ * timed out iff its associated qc is active and not failed.
+ */
+ if (ap->ops->error_handler) {
+ struct scsi_cmnd *scmd, *tmp;
+ int nr_timedout = 0;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
+ struct ata_queued_cmd *qc;
+
+ for (i = 0; i < ATA_MAX_QUEUE; i++) {
+ qc = __ata_qc_from_tag(ap, i);
+ if (qc->flags & ATA_QCFLAG_ACTIVE &&
+ qc->scsicmd == scmd)
+ break;
+ }
+
+ if (i < ATA_MAX_QUEUE) {
+ /* the scmd has an associated qc */
+ if (!(qc->flags & ATA_QCFLAG_FAILED)) {
+ /* which hasn't failed yet, timeout */
+ qc->err_mask |= AC_ERR_TIMEOUT;
+ qc->flags |= ATA_QCFLAG_FAILED;
+ nr_timedout++;
+ }
+ } else {
+ /* Normal completion occurred after
+ * SCSI timeout but before this point.
+ * Successfully complete it.
+ */
+ scmd->retries = scmd->allowed;
+ scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
+ }
+ }
+
+ /* If we have timed out qcs. They belong to EH from
+ * this point but the state of the controller is
+ * unknown. Freeze the port to make sure the IRQ
+ * handler doesn't diddle with those qcs. This must
+ * be done atomically w.r.t. setting QCFLAG_FAILED.
+ */
+ if (nr_timedout)
+ __ata_port_freeze(ap);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+ } else
+ spin_unlock_wait(ap->lock);
+
+ repeat:
+ /* invoke error handler */
+ if (ap->ops->error_handler) {
+ /* process port resume request */
+ ata_eh_handle_port_resume(ap);
+
+ /* fetch & clear EH info */
+ spin_lock_irqsave(ap->lock, flags);
+
+ memset(&ap->eh_context, 0, sizeof(ap->eh_context));
+ ap->eh_context.i = ap->eh_info;
+ memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+ ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
+ ap->pflags &= ~ATA_PFLAG_EH_PENDING;
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ /* invoke EH, skip if unloading or suspended */
+ if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
+ ap->ops->error_handler(ap);
+ else
+ ata_eh_finish(ap);
+
+ /* process port suspend request */
+ ata_eh_handle_port_suspend(ap);
+
+ /* Exception might have happend after ->error_handler
+ * recovered the port but before this point. Repeat
+ * EH in such case.
+ */
+ spin_lock_irqsave(ap->lock, flags);
+
+ if (ap->pflags & ATA_PFLAG_EH_PENDING) {
+ if (--repeat_cnt) {
+ ata_port_printk(ap, KERN_INFO,
+ "EH pending after completion, "
+ "repeating EH (cnt=%d)\n", repeat_cnt);
+ spin_unlock_irqrestore(ap->lock, flags);
+ goto repeat;
+ }
+ ata_port_printk(ap, KERN_ERR, "EH pending after %d "
+ "tries, giving up\n", ATA_EH_MAX_REPEAT);
+ }
+
+ /* this run is complete, make sure EH info is clear */
+ memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+ /* Clear host_eh_scheduled while holding ap->lock such
+ * that if exception occurs after this point but
+ * before EH completion, SCSI midlayer will
+ * re-initiate EH.
+ */
+ host->host_eh_scheduled = 0;
+
+ spin_unlock_irqrestore(ap->lock, flags);
+ } else {
+ WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
+ ap->ops->eng_timeout(ap);
+ }
+
+ /* finish or retry handled scmd's and clean up */
+ WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
+
+ scsi_eh_flush_done_q(&ap->eh_done_q);
+
+ /* clean up */
+ spin_lock_irqsave(ap->lock, flags);
+
+ if (ap->pflags & ATA_PFLAG_LOADING)
+ ap->pflags &= ~ATA_PFLAG_LOADING;
+ else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
+ queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0);
+
+ if (ap->pflags & ATA_PFLAG_RECOVERED)
+ ata_port_printk(ap, KERN_INFO, "EH complete\n");
+
+ ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
+
+ /* tell wait_eh that we're done */
+ ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
+ wake_up_all(&ap->eh_wait_q);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * ata_port_wait_eh - Wait for the currently pending EH to complete
+ * @ap: Port to wait EH for
+ *
+ * Wait until the currently pending EH is complete.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+void ata_port_wait_eh(struct ata_port *ap)
+{
+ unsigned long flags;
+ DEFINE_WAIT(wait);
+
+ retry:
+ spin_lock_irqsave(ap->lock, flags);
+
+ while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
+ prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
+ spin_unlock_irqrestore(ap->lock, flags);
+ schedule();
+ spin_lock_irqsave(ap->lock, flags);
+ }
+ finish_wait(&ap->eh_wait_q, &wait);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ /* make sure SCSI EH is complete */
+ if (scsi_host_in_recovery(ap->scsi_host)) {
+ msleep(10);
+ goto retry;
+ }
+}
+
+/**
+ * ata_qc_timeout - Handle timeout of queued command
+ * @qc: Command that timed out
+ *
+ * Some part of the kernel (currently, only the SCSI layer)
+ * has noticed that the active command on port @ap has not
+ * completed after a specified length of time. Handle this
+ * condition by disabling DMA (if necessary) and completing
+ * transactions, with error if necessary.
+ *
+ * This also handles the case of the "lost interrupt", where
+ * for some reason (possibly hardware bug, possibly driver bug)
+ * an interrupt was not delivered to the driver, even though the
+ * transaction completed successfully.
+ *
+ * TODO: kill this function once old EH is gone.
+ *
+ * LOCKING:
+ * Inherited from SCSI layer (none, can sleep)
+ */
+static void ata_qc_timeout(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ u8 host_stat = 0, drv_stat;
+ unsigned long flags;
+
+ DPRINTK("ENTER\n");
+
+ ap->hsm_task_state = HSM_ST_IDLE;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ switch (qc->tf.protocol) {
+
+ case ATA_PROT_DMA:
+ case ATA_PROT_ATAPI_DMA:
+ host_stat = ap->ops->bmdma_status(ap);
+
+ /* before we do anything else, clear DMA-Start bit */
+ ap->ops->bmdma_stop(qc);
+
+ /* fall through */
+
+ default:
+ ata_altstatus(ap);
+ drv_stat = ata_chk_status(ap);
+
+ /* ack bmdma irq events */
+ ap->ops->irq_clear(ap);
+
+ ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, "
+ "stat 0x%x host_stat 0x%x\n",
+ qc->tf.command, drv_stat, host_stat);
+
+ /* complete taskfile transaction */
+ qc->err_mask |= AC_ERR_TIMEOUT;
+ break;
+ }
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ ata_eh_qc_complete(qc);
+
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * ata_eng_timeout - Handle timeout of queued command
+ * @ap: Port on which timed-out command is active
+ *
+ * Some part of the kernel (currently, only the SCSI layer)
+ * has noticed that the active command on port @ap has not
+ * completed after a specified length of time. Handle this
+ * condition by disabling DMA (if necessary) and completing
+ * transactions, with error if necessary.
+ *
+ * This also handles the case of the "lost interrupt", where
+ * for some reason (possibly hardware bug, possibly driver bug)
+ * an interrupt was not delivered to the driver, even though the
+ * transaction completed successfully.
+ *
+ * TODO: kill this function once old EH is gone.
+ *
+ * LOCKING:
+ * Inherited from SCSI layer (none, can sleep)
+ */
+void ata_eng_timeout(struct ata_port *ap)
+{
+ DPRINTK("ENTER\n");
+
+ ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
+
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * ata_qc_schedule_eh - schedule qc for error handling
+ * @qc: command to schedule error handling for
+ *
+ * Schedule error handling for @qc. EH will kick in as soon as
+ * other commands are drained.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+
+ WARN_ON(!ap->ops->error_handler);
+
+ qc->flags |= ATA_QCFLAG_FAILED;
+ qc->ap->pflags |= ATA_PFLAG_EH_PENDING;
+
+ /* The following will fail if timeout has already expired.
+ * ata_scsi_error() takes care of such scmds on EH entry.
+ * Note that ATA_QCFLAG_FAILED is unconditionally set after
+ * this function completes.
+ */
+ scsi_req_abort_cmd(qc->scsicmd);
+}
+
+/**
+ * ata_port_schedule_eh - schedule error handling without a qc
+ * @ap: ATA port to schedule EH for
+ *
+ * Schedule error handling for @ap. EH will kick in as soon as
+ * all commands are drained.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+void ata_port_schedule_eh(struct ata_port *ap)
+{
+ WARN_ON(!ap->ops->error_handler);
+
+ ap->pflags |= ATA_PFLAG_EH_PENDING;
+ scsi_schedule_eh(ap->scsi_host);
+
+ DPRINTK("port EH scheduled\n");
+}
+
+/**
+ * ata_port_abort - abort all qc's on the port
+ * @ap: ATA port to abort qc's for
+ *
+ * Abort all active qc's of @ap and schedule EH.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * Number of aborted qc's.
+ */
+int ata_port_abort(struct ata_port *ap)
+{
+ int tag, nr_aborted = 0;
+
+ WARN_ON(!ap->ops->error_handler);
+
+ for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+ struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
+
+ if (qc) {
+ qc->flags |= ATA_QCFLAG_FAILED;
+ ata_qc_complete(qc);
+ nr_aborted++;
+ }
+ }
+
+ if (!nr_aborted)
+ ata_port_schedule_eh(ap);
+
+ return nr_aborted;
+}
+
+/**
+ * __ata_port_freeze - freeze port
+ * @ap: ATA port to freeze
+ *
+ * This function is called when HSM violation or some other
+ * condition disrupts normal operation of the port. Frozen port
+ * is not allowed to perform any operation until the port is
+ * thawed, which usually follows a successful reset.
+ *
+ * ap->ops->freeze() callback can be used for freezing the port
+ * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
+ * port cannot be frozen hardware-wise, the interrupt handler
+ * must ack and clear interrupts unconditionally while the port
+ * is frozen.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+static void __ata_port_freeze(struct ata_port *ap)
+{
+ WARN_ON(!ap->ops->error_handler);
+
+ if (ap->ops->freeze)
+ ap->ops->freeze(ap);
+
+ ap->pflags |= ATA_PFLAG_FROZEN;
+
+ DPRINTK("ata%u port frozen\n", ap->id);
+}
+
+/**
+ * ata_port_freeze - abort & freeze port
+ * @ap: ATA port to freeze
+ *
+ * Abort and freeze @ap.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * Number of aborted commands.
+ */
+int ata_port_freeze(struct ata_port *ap)
+{
+ int nr_aborted;
+
+ WARN_ON(!ap->ops->error_handler);
+
+ nr_aborted = ata_port_abort(ap);
+ __ata_port_freeze(ap);
+
+ return nr_aborted;
+}
+
+/**
+ * ata_eh_freeze_port - EH helper to freeze port
+ * @ap: ATA port to freeze
+ *
+ * Freeze @ap.
+ *
+ * LOCKING:
+ * None.
+ */
+void ata_eh_freeze_port(struct ata_port *ap)
+{
+ unsigned long flags;
+
+ if (!ap->ops->error_handler)
+ return;
+
+ spin_lock_irqsave(ap->lock, flags);
+ __ata_port_freeze(ap);
+ spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ * ata_port_thaw_port - EH helper to thaw port
+ * @ap: ATA port to thaw
+ *
+ * Thaw frozen port @ap.
+ *
+ * LOCKING:
+ * None.
+ */
+void ata_eh_thaw_port(struct ata_port *ap)
+{
+ unsigned long flags;
+
+ if (!ap->ops->error_handler)
+ return;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ ap->pflags &= ~ATA_PFLAG_FROZEN;
+
+ if (ap->ops->thaw)
+ ap->ops->thaw(ap);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ DPRINTK("ata%u port thawed\n", ap->id);
+}
+
+static void ata_eh_scsidone(struct scsi_cmnd *scmd)
+{
+ /* nada */
+}
+
+static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct scsi_cmnd *scmd = qc->scsicmd;
+ unsigned long flags;
+
+ spin_lock_irqsave(ap->lock, flags);
+ qc->scsidone = ata_eh_scsidone;
+ __ata_qc_complete(qc);
+ WARN_ON(ata_tag_valid(qc->tag));
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
+}
+
+/**
+ * ata_eh_qc_complete - Complete an active ATA command from EH
+ * @qc: Command to complete
+ *
+ * Indicate to the mid and upper layers that an ATA command has
+ * completed. To be used from EH.
+ */
+void ata_eh_qc_complete(struct ata_queued_cmd *qc)
+{
+ struct scsi_cmnd *scmd = qc->scsicmd;
+ scmd->retries = scmd->allowed;
+ __ata_eh_qc_complete(qc);
+}
+
+/**
+ * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
+ * @qc: Command to retry
+ *
+ * Indicate to the mid and upper layers that an ATA command
+ * should be retried. To be used from EH.
+ *
+ * SCSI midlayer limits the number of retries to scmd->allowed.
+ * scmd->retries is decremented for commands which get retried
+ * due to unrelated failures (qc->err_mask is zero).
+ */
+void ata_eh_qc_retry(struct ata_queued_cmd *qc)
+{
+ struct scsi_cmnd *scmd = qc->scsicmd;
+ if (!qc->err_mask && scmd->retries)
+ scmd->retries--;
+ __ata_eh_qc_complete(qc);
+}
+
+/**
+ * ata_eh_detach_dev - detach ATA device
+ * @dev: ATA device to detach
+ *
+ * Detach @dev.
+ *
+ * LOCKING:
+ * None.
+ */
+static void ata_eh_detach_dev(struct ata_device *dev)
+{
+ struct ata_port *ap = dev->ap;
+ unsigned long flags;
+
+ ata_dev_disable(dev);
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ dev->flags &= ~ATA_DFLAG_DETACH;
+
+ if (ata_scsi_offline_dev(dev)) {
+ dev->flags |= ATA_DFLAG_DETACHED;
+ ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
+ }
+
+ /* clear per-dev EH actions */
+ ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK);
+ ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ * ata_eh_about_to_do - about to perform eh_action
+ * @ap: target ATA port
+ * @dev: target ATA dev for per-dev action (can be NULL)
+ * @action: action about to be performed
+ *
+ * Called just before performing EH actions to clear related bits
+ * in @ap->eh_info such that eh actions are not unnecessarily
+ * repeated.
+ *
+ * LOCKING:
+ * None.
+ */
+static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
+ unsigned int action)
+{
+ unsigned long flags;
+ struct ata_eh_info *ehi = &ap->eh_info;
+ struct ata_eh_context *ehc = &ap->eh_context;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* Reset is represented by combination of actions and EHI
+ * flags. Suck in all related bits before clearing eh_info to
+ * avoid losing requested action.
+ */
+ if (action & ATA_EH_RESET_MASK) {
+ ehc->i.action |= ehi->action & ATA_EH_RESET_MASK;
+ ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK;
+
+ /* make sure all reset actions are cleared & clear EHI flags */
+ action |= ATA_EH_RESET_MASK;
+ ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
+ }
+
+ ata_eh_clear_action(dev, ehi, action);
+
+ if (!(ehc->i.flags & ATA_EHI_QUIET))
+ ap->pflags |= ATA_PFLAG_RECOVERED;
+
+ spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ * ata_eh_done - EH action complete
+ * @ap: target ATA port
+ * @dev: target ATA dev for per-dev action (can be NULL)
+ * @action: action just completed
+ *
+ * Called right after performing EH actions to clear related bits
+ * in @ap->eh_context.
+ *
+ * LOCKING:
+ * None.
+ */
+static void ata_eh_done(struct ata_port *ap, struct ata_device *dev,
+ unsigned int action)
+{
+ /* if reset is complete, clear all reset actions & reset modifier */
+ if (action & ATA_EH_RESET_MASK) {
+ action |= ATA_EH_RESET_MASK;
+ ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
+ }
+
+ ata_eh_clear_action(dev, &ap->eh_context.i, action);
+}
+
+/**
+ * ata_err_string - convert err_mask to descriptive string
+ * @err_mask: error mask to convert to string
+ *
+ * Convert @err_mask to descriptive string. Errors are
+ * prioritized according to severity and only the most severe
+ * error is reported.
+ *
+ * LOCKING:
+ * None.
+ *
+ * RETURNS:
+ * Descriptive string for @err_mask
+ */
+static const char * ata_err_string(unsigned int err_mask)
+{
+ if (err_mask & AC_ERR_HOST_BUS)
+ return "host bus error";
+ if (err_mask & AC_ERR_ATA_BUS)
+ return "ATA bus error";
+ if (err_mask & AC_ERR_TIMEOUT)
+ return "timeout";
+ if (err_mask & AC_ERR_HSM)
+ return "HSM violation";
+ if (err_mask & AC_ERR_SYSTEM)
+ return "internal error";
+ if (err_mask & AC_ERR_MEDIA)
+ return "media error";
+ if (err_mask & AC_ERR_INVALID)
+ return "invalid argument";
+ if (err_mask & AC_ERR_DEV)
+ return "device error";
+ return "unknown error";
+}
+
+/**
+ * ata_read_log_page - read a specific log page
+ * @dev: target device
+ * @page: page to read
+ * @buf: buffer to store read page
+ * @sectors: number of sectors to read
+ *
+ * Read log page using READ_LOG_EXT command.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_read_log_page(struct ata_device *dev,
+ u8 page, void *buf, unsigned int sectors)
+{
+ struct ata_taskfile tf;
+ unsigned int err_mask;
+
+ DPRINTK("read log page - page %d\n", page);
+
+ ata_tf_init(dev, &tf);
+ tf.command = ATA_CMD_READ_LOG_EXT;
+ tf.lbal = page;
+ tf.nsect = sectors;
+ tf.hob_nsect = sectors >> 8;
+ tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
+ tf.protocol = ATA_PROT_PIO;
+
+ err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
+ buf, sectors * ATA_SECT_SIZE);
+
+ DPRINTK("EXIT, err_mask=%x\n", err_mask);
+ return err_mask;
+}
+
+/**
+ * ata_eh_read_log_10h - Read log page 10h for NCQ error details
+ * @dev: Device to read log page 10h from
+ * @tag: Resulting tag of the failed command
+ * @tf: Resulting taskfile registers of the failed command
+ *
+ * Read log page 10h to obtain NCQ error details and clear error
+ * condition.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+static int ata_eh_read_log_10h(struct ata_device *dev,
+ int *tag, struct ata_taskfile *tf)
+{
+ u8 *buf = dev->ap->sector_buf;
+ unsigned int err_mask;
+ u8 csum;
+ int i;
+
+ err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1);
+ if (err_mask)
+ return -EIO;
+
+ csum = 0;
+ for (i = 0; i < ATA_SECT_SIZE; i++)
+ csum += buf[i];
+ if (csum)
+ ata_dev_printk(dev, KERN_WARNING,
+ "invalid checksum 0x%x on log page 10h\n", csum);
+
+ if (buf[0] & 0x80)
+ return -ENOENT;
+
+ *tag = buf[0] & 0x1f;
+
+ tf->command = buf[2];
+ tf->feature = buf[3];
+ tf->lbal = buf[4];
+ tf->lbam = buf[5];
+ tf->lbah = buf[6];
+ tf->device = buf[7];
+ tf->hob_lbal = buf[8];
+ tf->hob_lbam = buf[9];
+ tf->hob_lbah = buf[10];
+ tf->nsect = buf[12];
+ tf->hob_nsect = buf[13];
+
+ return 0;
+}
+
+/**
+ * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
+ * @dev: device to perform REQUEST_SENSE to
+ * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
+ *
+ * Perform ATAPI REQUEST_SENSE after the device reported CHECK
+ * SENSE. This function is EH helper.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, AC_ERR_* mask on failure
+ */
+static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc)
+{
+ struct ata_device *dev = qc->dev;
+ unsigned char *sense_buf = qc->scsicmd->sense_buffer;
+ struct ata_port *ap = dev->ap;
+ struct ata_taskfile tf;
+ u8 cdb[ATAPI_CDB_LEN];
+
+ DPRINTK("ATAPI request sense\n");
+
+ /* FIXME: is this needed? */
+ memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
+
+ /* initialize sense_buf with the error register,
+ * for the case where they are -not- overwritten
+ */
+ sense_buf[0] = 0x70;
+ sense_buf[2] = qc->result_tf.feature >> 4;
+
+ /* some devices time out if garbage left in tf */
+ ata_tf_init(dev, &tf);
+
+ memset(cdb, 0, ATAPI_CDB_LEN);
+ cdb[0] = REQUEST_SENSE;
+ cdb[4] = SCSI_SENSE_BUFFERSIZE;
+
+ tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.command = ATA_CMD_PACKET;
+
+ /* is it pointless to prefer PIO for "safety reasons"? */
+ if (ap->flags & ATA_FLAG_PIO_DMA) {
+ tf.protocol = ATA_PROT_ATAPI_DMA;
+ tf.feature |= ATAPI_PKT_DMA;
+ } else {
+ tf.protocol = ATA_PROT_ATAPI;
+ tf.lbam = (8 * 1024) & 0xff;
+ tf.lbah = (8 * 1024) >> 8;
+ }
+
+ return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
+ sense_buf, SCSI_SENSE_BUFFERSIZE);
+}
+
+/**
+ * ata_eh_analyze_serror - analyze SError for a failed port
+ * @ap: ATA port to analyze SError for
+ *
+ * Analyze SError if available and further determine cause of
+ * failure.
+ *
+ * LOCKING:
+ * None.
+ */
+static void ata_eh_analyze_serror(struct ata_port *ap)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ u32 serror = ehc->i.serror;
+ unsigned int err_mask = 0, action = 0;
+
+ if (serror & SERR_PERSISTENT) {
+ err_mask |= AC_ERR_ATA_BUS;
+ action |= ATA_EH_HARDRESET;
+ }
+ if (serror &
+ (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) {
+ err_mask |= AC_ERR_ATA_BUS;
+ action |= ATA_EH_SOFTRESET;
+ }
+ if (serror & SERR_PROTOCOL) {
+ err_mask |= AC_ERR_HSM;
+ action |= ATA_EH_SOFTRESET;
+ }
+ if (serror & SERR_INTERNAL) {
+ err_mask |= AC_ERR_SYSTEM;
+ action |= ATA_EH_SOFTRESET;
+ }
+ if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG))
+ ata_ehi_hotplugged(&ehc->i);
+
+ ehc->i.err_mask |= err_mask;
+ ehc->i.action |= action;
+}
+
+/**
+ * ata_eh_analyze_ncq_error - analyze NCQ error
+ * @ap: ATA port to analyze NCQ error for
+ *
+ * Read log page 10h, determine the offending qc and acquire
+ * error status TF. For NCQ device errors, all LLDDs have to do
+ * is setting AC_ERR_DEV in ehi->err_mask. This function takes
+ * care of the rest.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+static void ata_eh_analyze_ncq_error(struct ata_port *ap)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ struct ata_device *dev = ap->device;
+ struct ata_queued_cmd *qc;
+ struct ata_taskfile tf;
+ int tag, rc;
+
+ /* if frozen, we can't do much */
+ if (ap->pflags & ATA_PFLAG_FROZEN)
+ return;
+
+ /* is it NCQ device error? */
+ if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
+ return;
+
+ /* has LLDD analyzed already? */
+ for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+ qc = __ata_qc_from_tag(ap, tag);
+
+ if (!(qc->flags & ATA_QCFLAG_FAILED))
+ continue;
+
+ if (qc->err_mask)
+ return;
+ }
+
+ /* okay, this error is ours */
+ rc = ata_eh_read_log_10h(dev, &tag, &tf);
+ if (rc) {
+ ata_port_printk(ap, KERN_ERR, "failed to read log page 10h "
+ "(errno=%d)\n", rc);
+ return;
+ }
+
+ if (!(ap->sactive & (1 << tag))) {
+ ata_port_printk(ap, KERN_ERR, "log page 10h reported "
+ "inactive tag %d\n", tag);
+ return;
+ }
+
+ /* we've got the perpetrator, condemn it */
+ qc = __ata_qc_from_tag(ap, tag);
+ memcpy(&qc->result_tf, &tf, sizeof(tf));
+ qc->err_mask |= AC_ERR_DEV;
+ ehc->i.err_mask &= ~AC_ERR_DEV;
+}
+
+/**
+ * ata_eh_analyze_tf - analyze taskfile of a failed qc
+ * @qc: qc to analyze
+ * @tf: Taskfile registers to analyze
+ *
+ * Analyze taskfile of @qc and further determine cause of
+ * failure. This function also requests ATAPI sense data if
+ * avaliable.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * Determined recovery action
+ */
+static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
+ const struct ata_taskfile *tf)
+{
+ unsigned int tmp, action = 0;
+ u8 stat = tf->command, err = tf->feature;
+
+ if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
+ qc->err_mask |= AC_ERR_HSM;
+ return ATA_EH_SOFTRESET;
+ }
+
+ if (!(qc->err_mask & AC_ERR_DEV))
+ return 0;
+
+ switch (qc->dev->class) {
+ case ATA_DEV_ATA:
+ if (err & ATA_ICRC)
+ qc->err_mask |= AC_ERR_ATA_BUS;
+ if (err & ATA_UNC)
+ qc->err_mask |= AC_ERR_MEDIA;
+ if (err & ATA_IDNF)
+ qc->err_mask |= AC_ERR_INVALID;
+ break;
+
+ case ATA_DEV_ATAPI:
+ if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
+ tmp = atapi_eh_request_sense(qc);
+ if (!tmp) {
+ /* ATA_QCFLAG_SENSE_VALID is used to
+ * tell atapi_qc_complete() that sense
+ * data is already valid.
+ *
+ * TODO: interpret sense data and set
+ * appropriate err_mask.
+ */
+ qc->flags |= ATA_QCFLAG_SENSE_VALID;
+ } else
+ qc->err_mask |= tmp;
+ }
+ }
+
+ if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
+ action |= ATA_EH_SOFTRESET;
+
+ return action;
+}
+
+static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent)
+{
+ if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT))
+ return 1;
+
+ if (ent->is_io) {
+ if (ent->err_mask & AC_ERR_HSM)
+ return 1;
+ if ((ent->err_mask &
+ (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
+ return 2;
+ }
+
+ return 0;
+}
+
+struct speed_down_needed_arg {
+ u64 since;
+ int nr_errors[3];
+};
+
+static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg)
+{
+ struct speed_down_needed_arg *arg = void_arg;
+
+ if (ent->timestamp < arg->since)
+ return -1;
+
+ arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++;
+ return 0;
+}
+
+/**
+ * ata_eh_speed_down_needed - Determine wheter speed down is necessary
+ * @dev: Device of interest
+ *
+ * This function examines error ring of @dev and determines
+ * whether speed down is necessary. Speed down is necessary if
+ * there have been more than 3 of Cat-1 errors or 10 of Cat-2
+ * errors during last 15 minutes.
+ *
+ * Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM
+ * violation for known supported commands.
+ *
+ * Cat-2 errors are unclassified DEV error for known supported
+ * command.
+ *
+ * LOCKING:
+ * Inherited from caller.
+ *
+ * RETURNS:
+ * 1 if speed down is necessary, 0 otherwise
+ */
+static int ata_eh_speed_down_needed(struct ata_device *dev)
+{
+ const u64 interval = 15LLU * 60 * HZ;
+ static const int err_limits[3] = { -1, 3, 10 };
+ struct speed_down_needed_arg arg;
+ struct ata_ering_entry *ent;
+ int err_cat;
+ u64 j64;
+
+ ent = ata_ering_top(&dev->ering);
+ if (!ent)
+ return 0;
+
+ err_cat = ata_eh_categorize_ering_entry(ent);
+ if (err_cat == 0)
+ return 0;
+
+ memset(&arg, 0, sizeof(arg));
+
+ j64 = get_jiffies_64();
+ if (j64 >= interval)
+ arg.since = j64 - interval;
+ else
+ arg.since = 0;
+
+ ata_ering_map(&dev->ering, speed_down_needed_cb, &arg);
+
+ return arg.nr_errors[err_cat] > err_limits[err_cat];
+}
+
+/**
+ * ata_eh_speed_down - record error and speed down if necessary
+ * @dev: Failed device
+ * @is_io: Did the device fail during normal IO?
+ * @err_mask: err_mask of the error
+ *
+ * Record error and examine error history to determine whether
+ * adjusting transmission speed is necessary. It also sets
+ * transmission limits appropriately if such adjustment is
+ * necessary.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise
+ */
+static int ata_eh_speed_down(struct ata_device *dev, int is_io,
+ unsigned int err_mask)
+{
+ if (!err_mask)
+ return 0;
+
+ /* record error and determine whether speed down is necessary */
+ ata_ering_record(&dev->ering, is_io, err_mask);
+
+ if (!ata_eh_speed_down_needed(dev))
+ return 0;
+
+ /* speed down SATA link speed if possible */
+ if (sata_down_spd_limit(dev->ap) == 0)
+ return ATA_EH_HARDRESET;
+
+ /* lower transfer mode */
+ if (ata_down_xfermask_limit(dev, 0) == 0)
+ return ATA_EH_SOFTRESET;
+
+ ata_dev_printk(dev, KERN_ERR,
+ "speed down requested but no transfer mode left\n");
+ return 0;
+}
+
+/**
+ * ata_eh_autopsy - analyze error and determine recovery action
+ * @ap: ATA port to perform autopsy on
+ *
+ * Analyze why @ap failed and determine which recovery action is
+ * needed. This function also sets more detailed AC_ERR_* values
+ * and fills sense data for ATAPI CHECK SENSE.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+static void ata_eh_autopsy(struct ata_port *ap)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ unsigned int all_err_mask = 0;
+ int tag, is_io = 0;
+ u32 serror;
+ int rc;
+
+ DPRINTK("ENTER\n");
+
+ if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
+ return;
+
+ /* obtain and analyze SError */
+ rc = sata_scr_read(ap, SCR_ERROR, &serror);
+ if (rc == 0) {
+ ehc->i.serror |= serror;
+ ata_eh_analyze_serror(ap);
+ } else if (rc != -EOPNOTSUPP)
+ ehc->i.action |= ATA_EH_HARDRESET;
+
+ /* analyze NCQ failure */
+ ata_eh_analyze_ncq_error(ap);
+
+ /* any real error trumps AC_ERR_OTHER */
+ if (ehc->i.err_mask & ~AC_ERR_OTHER)
+ ehc->i.err_mask &= ~AC_ERR_OTHER;
+
+ all_err_mask |= ehc->i.err_mask;
+
+ for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+ struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+ if (!(qc->flags & ATA_QCFLAG_FAILED))
+ continue;
+
+ /* inherit upper level err_mask */
+ qc->err_mask |= ehc->i.err_mask;
+
+ /* analyze TF */
+ ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
+
+ /* DEV errors are probably spurious in case of ATA_BUS error */
+ if (qc->err_mask & AC_ERR_ATA_BUS)
+ qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
+ AC_ERR_INVALID);
+
+ /* any real error trumps unknown error */
+ if (qc->err_mask & ~AC_ERR_OTHER)
+ qc->err_mask &= ~AC_ERR_OTHER;
+
+ /* SENSE_VALID trumps dev/unknown error and revalidation */
+ if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
+ qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
+ ehc->i.action &= ~ATA_EH_REVALIDATE;
+ }
+
+ /* accumulate error info */
+ ehc->i.dev = qc->dev;
+ all_err_mask |= qc->err_mask;
+ if (qc->flags & ATA_QCFLAG_IO)
+ is_io = 1;
+ }
+
+ /* enforce default EH actions */
+ if (ap->pflags & ATA_PFLAG_FROZEN ||
+ all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
+ ehc->i.action |= ATA_EH_SOFTRESET;
+ else if (all_err_mask)
+ ehc->i.action |= ATA_EH_REVALIDATE;
+
+ /* if we have offending qcs and the associated failed device */
+ if (ehc->i.dev) {
+ /* speed down */
+ ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io,
+ all_err_mask);
+
+ /* perform per-dev EH action only on the offending device */
+ ehc->i.dev_action[ehc->i.dev->devno] |=
+ ehc->i.action & ATA_EH_PERDEV_MASK;
+ ehc->i.action &= ~ATA_EH_PERDEV_MASK;
+ }
+
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * ata_eh_report - report error handling to user
+ * @ap: ATA port EH is going on
+ *
+ * Report EH to user.
+ *
+ * LOCKING:
+ * None.
+ */
+static void ata_eh_report(struct ata_port *ap)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ const char *frozen, *desc;
+ int tag, nr_failed = 0;
+
+ desc = NULL;
+ if (ehc->i.desc[0] != '\0')
+ desc = ehc->i.desc;
+
+ for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+ struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+ if (!(qc->flags & ATA_QCFLAG_FAILED))
+ continue;
+ if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
+ continue;
+
+ nr_failed++;
+ }
+
+ if (!nr_failed && !ehc->i.err_mask)
+ return;
+
+ frozen = "";
+ if (ap->pflags & ATA_PFLAG_FROZEN)
+ frozen = " frozen";
+
+ if (ehc->i.dev) {
+ ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
+ "SAct 0x%x SErr 0x%x action 0x%x%s\n",
+ ehc->i.err_mask, ap->sactive, ehc->i.serror,
+ ehc->i.action, frozen);
+ if (desc)
+ ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc);
+ } else {
+ ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x "
+ "SAct 0x%x SErr 0x%x action 0x%x%s\n",
+ ehc->i.err_mask, ap->sactive, ehc->i.serror,
+ ehc->i.action, frozen);
+ if (desc)
+ ata_port_printk(ap, KERN_ERR, "(%s)\n", desc);
+ }
+
+ for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+ static const char *dma_str[] = {
+ [DMA_BIDIRECTIONAL] = "bidi",
+ [DMA_TO_DEVICE] = "out",
+ [DMA_FROM_DEVICE] = "in",
+ [DMA_NONE] = "",
+ };
+ struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+ struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
+ unsigned int nbytes;
+
+ if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask)
+ continue;
+
+ nbytes = qc->nbytes;
+ if (!nbytes)
+ nbytes = qc->nsect << 9;
+
+ ata_dev_printk(qc->dev, KERN_ERR,
+ "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
+ "tag %d cdb 0x%x data %u %s\n "
+ "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
+ "Emask 0x%x (%s)\n",
+ cmd->command, cmd->feature, cmd->nsect,
+ cmd->lbal, cmd->lbam, cmd->lbah,
+ cmd->hob_feature, cmd->hob_nsect,
+ cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
+ cmd->device, qc->tag, qc->cdb[0], nbytes,
+ dma_str[qc->dma_dir],
+ res->command, res->feature, res->nsect,
+ res->lbal, res->lbam, res->lbah,
+ res->hob_feature, res->hob_nsect,
+ res->hob_lbal, res->hob_lbam, res->hob_lbah,
+ res->device, qc->err_mask, ata_err_string(qc->err_mask));
+ }
+}
+
+static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
+ unsigned int *classes)
+{
+ int i, rc;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ classes[i] = ATA_DEV_UNKNOWN;
+
+ rc = reset(ap, classes);
+ if (rc)
+ return rc;
+
+ /* If any class isn't ATA_DEV_UNKNOWN, consider classification
+ * is complete and convert all ATA_DEV_UNKNOWN to
+ * ATA_DEV_NONE.
+ */
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ if (classes[i] != ATA_DEV_UNKNOWN)
+ break;
+
+ if (i < ATA_MAX_DEVICES)
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ if (classes[i] == ATA_DEV_UNKNOWN)
+ classes[i] = ATA_DEV_NONE;
+
+ return 0;
+}
+
+static int ata_eh_followup_srst_needed(int rc, int classify,
+ const unsigned int *classes)
+{
+ if (rc == -EAGAIN)
+ return 1;
+ if (rc != 0)
+ return 0;
+ if (classify && classes[0] == ATA_DEV_UNKNOWN)
+ return 1;
+ return 0;
+}
+
+static int ata_eh_reset(struct ata_port *ap, int classify,
+ ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
+ ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ unsigned int *classes = ehc->classes;
+ int tries = ATA_EH_RESET_TRIES;
+ int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
+ unsigned int action;
+ ata_reset_fn_t reset;
+ int i, did_followup_srst, rc;
+
+ /* about to reset */
+ ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK);
+
+ /* Determine which reset to use and record in ehc->i.action.
+ * prereset() may examine and modify it.
+ */
+ action = ehc->i.action;
+ ehc->i.action &= ~ATA_EH_RESET_MASK;
+ if (softreset && (!hardreset || (!sata_set_spd_needed(ap) &&
+ !(action & ATA_EH_HARDRESET))))
+ ehc->i.action |= ATA_EH_SOFTRESET;
+ else
+ ehc->i.action |= ATA_EH_HARDRESET;
+
+ if (prereset) {
+ rc = prereset(ap);
+ if (rc) {
+ if (rc == -ENOENT) {
+ ata_port_printk(ap, KERN_DEBUG, "port disabled. ignoring.\n");
+ ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
+ } else
+ ata_port_printk(ap, KERN_ERR,
+ "prereset failed (errno=%d)\n", rc);
+ return rc;
+ }
+ }
+
+ /* prereset() might have modified ehc->i.action */
+ if (ehc->i.action & ATA_EH_HARDRESET)
+ reset = hardreset;
+ else if (ehc->i.action & ATA_EH_SOFTRESET)
+ reset = softreset;
+ else {
+ /* prereset told us not to reset, bang classes and return */
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ classes[i] = ATA_DEV_NONE;
+ return 0;
+ }
+
+ /* did prereset() screw up? if so, fix up to avoid oopsing */
+ if (!reset) {
+ ata_port_printk(ap, KERN_ERR, "BUG: prereset() requested "
+ "invalid reset type\n");
+ if (softreset)
+ reset = softreset;
+ else
+ reset = hardreset;
+ }
+
+ retry:
+ /* shut up during boot probing */
+ if (verbose)
+ ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
+ reset == softreset ? "soft" : "hard");
+
+ /* mark that this EH session started with reset */
+ ehc->i.flags |= ATA_EHI_DID_RESET;
+
+ rc = ata_do_reset(ap, reset, classes);
+
+ did_followup_srst = 0;
+ if (reset == hardreset &&
+ ata_eh_followup_srst_needed(rc, classify, classes)) {
+ /* okay, let's do follow-up softreset */
+ did_followup_srst = 1;
+ reset = softreset;
+
+ if (!reset) {
+ ata_port_printk(ap, KERN_ERR,
+ "follow-up softreset required "
+ "but no softreset avaliable\n");
+ return -EINVAL;
+ }
+
+ ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
+ rc = ata_do_reset(ap, reset, classes);
+
+ if (rc == 0 && classify &&
+ classes[0] == ATA_DEV_UNKNOWN) {
+ ata_port_printk(ap, KERN_ERR,
+ "classification failed\n");
+ return -EINVAL;
+ }
+ }
+
+ if (rc && --tries) {
+ const char *type;
+
+ if (reset == softreset) {
+ if (did_followup_srst)
+ type = "follow-up soft";
+ else
+ type = "soft";
+ } else
+ type = "hard";
+
+ ata_port_printk(ap, KERN_WARNING,
+ "%sreset failed, retrying in 5 secs\n", type);
+ ssleep(5);
+
+ if (reset == hardreset)
+ sata_down_spd_limit(ap);
+ if (hardreset)
+ reset = hardreset;
+ goto retry;
+ }
+
+ if (rc == 0) {
+ /* After the reset, the device state is PIO 0 and the
+ * controller state is undefined. Record the mode.
+ */
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ ap->device[i].pio_mode = XFER_PIO_0;
+
+ if (postreset)
+ postreset(ap, classes);
+
+ /* reset successful, schedule revalidation */
+ ata_eh_done(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK);
+ ehc->i.action |= ATA_EH_REVALIDATE;
+ }
+
+ return rc;
+}
+
+static int ata_eh_revalidate_and_attach(struct ata_port *ap,
+ struct ata_device **r_failed_dev)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ struct ata_device *dev;
+ unsigned long flags;
+ int i, rc = 0;
+
+ DPRINTK("ENTER\n");
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ unsigned int action, readid_flags = 0;
+
+ dev = &ap->device[i];
+ action = ata_eh_dev_action(dev);
+
+ if (ehc->i.flags & ATA_EHI_DID_RESET)
+ readid_flags |= ATA_READID_POSTRESET;
+
+ if (action & ATA_EH_REVALIDATE && ata_dev_ready(dev)) {
+ if (ata_port_offline(ap)) {
+ rc = -EIO;
+ break;
+ }
+
+ ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
+ rc = ata_dev_revalidate(dev, readid_flags);
+ if (rc)
+ break;
+
+ ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
+
+ /* Configuration may have changed, reconfigure
+ * transfer mode.
+ */
+ ehc->i.flags |= ATA_EHI_SETMODE;
+
+ /* schedule the scsi_rescan_device() here */
+ queue_work(ata_aux_wq, &(ap->scsi_rescan_task));
+ } else if (dev->class == ATA_DEV_UNKNOWN &&
+ ehc->tries[dev->devno] &&
+ ata_class_enabled(ehc->classes[dev->devno])) {
+ dev->class = ehc->classes[dev->devno];
+
+ rc = ata_dev_read_id(dev, &dev->class, readid_flags,
+ dev->id);
+ if (rc == 0) {
+ ehc->i.flags |= ATA_EHI_PRINTINFO;
+ rc = ata_dev_configure(dev);
+ ehc->i.flags &= ~ATA_EHI_PRINTINFO;
+ } else if (rc == -ENOENT) {
+ /* IDENTIFY was issued to non-existent
+ * device. No need to reset. Just
+ * thaw and kill the device.
+ */
+ ata_eh_thaw_port(ap);
+ dev->class = ATA_DEV_UNKNOWN;
+ rc = 0;
+ }
+
+ if (rc) {
+ dev->class = ATA_DEV_UNKNOWN;
+ break;
+ }
+
+ if (ata_dev_enabled(dev)) {
+ spin_lock_irqsave(ap->lock, flags);
+ ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ /* new device discovered, configure xfermode */
+ ehc->i.flags |= ATA_EHI_SETMODE;
+ }
+ }
+ }
+
+ if (rc)
+ *r_failed_dev = dev;
+
+ DPRINTK("EXIT\n");
+ return rc;
+}
+
+/**
+ * ata_eh_suspend - handle suspend EH action
+ * @ap: target host port
+ * @r_failed_dev: result parameter to indicate failing device
+ *
+ * Handle suspend EH action. Disk devices are spinned down and
+ * other types of devices are just marked suspended. Once
+ * suspended, no EH action to the device is allowed until it is
+ * resumed.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise
+ */
+static int ata_eh_suspend(struct ata_port *ap, struct ata_device **r_failed_dev)
+{
+ struct ata_device *dev;
+ int i, rc = 0;
+
+ DPRINTK("ENTER\n");
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ unsigned long flags;
+ unsigned int action, err_mask;
+
+ dev = &ap->device[i];
+ action = ata_eh_dev_action(dev);
+
+ if (!ata_dev_enabled(dev) || !(action & ATA_EH_SUSPEND))
+ continue;
+
+ WARN_ON(dev->flags & ATA_DFLAG_SUSPENDED);
+
+ ata_eh_about_to_do(ap, dev, ATA_EH_SUSPEND);
+
+ if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) {
+ /* flush cache */
+ rc = ata_flush_cache(dev);
+ if (rc)
+ break;
+
+ /* spin down */
+ err_mask = ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
+ if (err_mask) {
+ ata_dev_printk(dev, KERN_ERR, "failed to "
+ "spin down (err_mask=0x%x)\n",
+ err_mask);
+ rc = -EIO;
+ break;
+ }
+ }
+
+ spin_lock_irqsave(ap->lock, flags);
+ dev->flags |= ATA_DFLAG_SUSPENDED;
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ ata_eh_done(ap, dev, ATA_EH_SUSPEND);
+ }
+
+ if (rc)
+ *r_failed_dev = dev;
+
+ DPRINTK("EXIT\n");
+ return rc;
+}
+
+/**
+ * ata_eh_prep_resume - prep for resume EH action
+ * @ap: target host port
+ *
+ * Clear SUSPENDED in preparation for scheduled resume actions.
+ * This allows other parts of EH to access the devices being
+ * resumed.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+static void ata_eh_prep_resume(struct ata_port *ap)
+{
+ struct ata_device *dev;
+ unsigned long flags;
+ int i;
+
+ DPRINTK("ENTER\n");
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ unsigned int action;
+
+ dev = &ap->device[i];
+ action = ata_eh_dev_action(dev);
+
+ if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME))
+ continue;
+
+ spin_lock_irqsave(ap->lock, flags);
+ dev->flags &= ~ATA_DFLAG_SUSPENDED;
+ spin_unlock_irqrestore(ap->lock, flags);
+ }
+
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * ata_eh_resume - handle resume EH action
+ * @ap: target host port
+ * @r_failed_dev: result parameter to indicate failing device
+ *
+ * Handle resume EH action. Target devices are already reset and
+ * revalidated. Spinning up is the only operation left.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise
+ */
+static int ata_eh_resume(struct ata_port *ap, struct ata_device **r_failed_dev)
+{
+ struct ata_device *dev;
+ int i, rc = 0;
+
+ DPRINTK("ENTER\n");
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ unsigned int action, err_mask;
+
+ dev = &ap->device[i];
+ action = ata_eh_dev_action(dev);
+
+ if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME))
+ continue;
+
+ ata_eh_about_to_do(ap, dev, ATA_EH_RESUME);
+
+ if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) {
+ err_mask = ata_do_simple_cmd(dev,
+ ATA_CMD_IDLEIMMEDIATE);
+ if (err_mask) {
+ ata_dev_printk(dev, KERN_ERR, "failed to "
+ "spin up (err_mask=0x%x)\n",
+ err_mask);
+ rc = -EIO;
+ break;
+ }
+ }
+
+ ata_eh_done(ap, dev, ATA_EH_RESUME);
+ }
+
+ if (rc)
+ *r_failed_dev = dev;
+
+ DPRINTK("EXIT\n");
+ return 0;
+}
+
+static int ata_port_nr_enabled(struct ata_port *ap)
+{
+ int i, cnt = 0;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ if (ata_dev_enabled(&ap->device[i]))
+ cnt++;
+ return cnt;
+}
+
+static int ata_port_nr_vacant(struct ata_port *ap)
+{
+ int i, cnt = 0;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ if (ap->device[i].class == ATA_DEV_UNKNOWN)
+ cnt++;
+ return cnt;
+}
+
+static int ata_eh_skip_recovery(struct ata_port *ap)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ int i;
+
+ /* skip if all possible devices are suspended */
+ for (i = 0; i < ata_port_max_devices(ap); i++) {
+ struct ata_device *dev = &ap->device[i];
+
+ if (!(dev->flags & ATA_DFLAG_SUSPENDED))
+ break;
+ }
+
+ if (i == ata_port_max_devices(ap))
+ return 1;
+
+ /* thaw frozen port, resume link and recover failed devices */
+ if ((ap->pflags & ATA_PFLAG_FROZEN) ||
+ (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap))
+ return 0;
+
+ /* skip if class codes for all vacant slots are ATA_DEV_NONE */
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+
+ if (dev->class == ATA_DEV_UNKNOWN &&
+ ehc->classes[dev->devno] != ATA_DEV_NONE)
+ return 0;
+ }
+
+ return 1;
+}
+
+/**
+ * ata_eh_recover - recover host port after error
+ * @ap: host port to recover
+ * @prereset: prereset method (can be NULL)
+ * @softreset: softreset method (can be NULL)
+ * @hardreset: hardreset method (can be NULL)
+ * @postreset: postreset method (can be NULL)
+ *
+ * This is the alpha and omega, eum and yang, heart and soul of
+ * libata exception handling. On entry, actions required to
+ * recover the port and hotplug requests are recorded in
+ * eh_context. This function executes all the operations with
+ * appropriate retrials and fallbacks to resurrect failed
+ * devices, detach goners and greet newcomers.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
+ ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+ ata_postreset_fn_t postreset)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ struct ata_device *dev;
+ int down_xfermask, i, rc;
+
+ DPRINTK("ENTER\n");
+
+ /* prep for recovery */
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ dev = &ap->device[i];
+
+ ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+
+ /* collect port action mask recorded in dev actions */
+ ehc->i.action |= ehc->i.dev_action[i] & ~ATA_EH_PERDEV_MASK;
+ ehc->i.dev_action[i] &= ATA_EH_PERDEV_MASK;
+
+ /* process hotplug request */
+ if (dev->flags & ATA_DFLAG_DETACH)
+ ata_eh_detach_dev(dev);
+
+ if (!ata_dev_enabled(dev) &&
+ ((ehc->i.probe_mask & (1 << dev->devno)) &&
+ !(ehc->did_probe_mask & (1 << dev->devno)))) {
+ ata_eh_detach_dev(dev);
+ ata_dev_init(dev);
+ ehc->did_probe_mask |= (1 << dev->devno);
+ ehc->i.action |= ATA_EH_SOFTRESET;
+ }
+ }
+
+ retry:
+ down_xfermask = 0;
+ rc = 0;
+
+ /* if UNLOADING, finish immediately */
+ if (ap->pflags & ATA_PFLAG_UNLOADING)
+ goto out;
+
+ /* prep for resume */
+ ata_eh_prep_resume(ap);
+
+ /* skip EH if possible. */
+ if (ata_eh_skip_recovery(ap))
+ ehc->i.action = 0;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ ehc->classes[i] = ATA_DEV_UNKNOWN;
+
+ /* reset */
+ if (ehc->i.action & ATA_EH_RESET_MASK) {
+ ata_eh_freeze_port(ap);
+
+ rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset,
+ softreset, hardreset, postreset);
+ if (rc) {
+ ata_port_printk(ap, KERN_ERR,
+ "reset failed, giving up\n");
+ goto out;
+ }
+
+ ata_eh_thaw_port(ap);
+ }
+
+ /* revalidate existing devices and attach new ones */
+ rc = ata_eh_revalidate_and_attach(ap, &dev);
+ if (rc)
+ goto dev_fail;
+
+ /* resume devices */
+ rc = ata_eh_resume(ap, &dev);
+ if (rc)
+ goto dev_fail;
+
+ /* configure transfer mode if necessary */
+ if (ehc->i.flags & ATA_EHI_SETMODE) {
+ rc = ata_set_mode(ap, &dev);
+ if (rc) {
+ down_xfermask = 1;
+ goto dev_fail;
+ }
+ ehc->i.flags &= ~ATA_EHI_SETMODE;
+ }
+
+ /* suspend devices */
+ rc = ata_eh_suspend(ap, &dev);
+ if (rc)
+ goto dev_fail;
+
+ goto out;
+
+ dev_fail:
+ switch (rc) {
+ case -ENODEV:
+ /* device missing, schedule probing */
+ ehc->i.probe_mask |= (1 << dev->devno);
+ case -EINVAL:
+ ehc->tries[dev->devno] = 0;
+ break;
+ case -EIO:
+ sata_down_spd_limit(ap);
+ default:
+ ehc->tries[dev->devno]--;
+ if (down_xfermask &&
+ ata_down_xfermask_limit(dev, ehc->tries[dev->devno] == 1))
+ ehc->tries[dev->devno] = 0;
+ }
+
+ if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
+ /* disable device if it has used up all its chances */
+ ata_dev_disable(dev);
+
+ /* detach if offline */
+ if (ata_port_offline(ap))
+ ata_eh_detach_dev(dev);
+
+ /* probe if requested */
+ if ((ehc->i.probe_mask & (1 << dev->devno)) &&
+ !(ehc->did_probe_mask & (1 << dev->devno))) {
+ ata_eh_detach_dev(dev);
+ ata_dev_init(dev);
+
+ ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+ ehc->did_probe_mask |= (1 << dev->devno);
+ ehc->i.action |= ATA_EH_SOFTRESET;
+ }
+ } else {
+ /* soft didn't work? be haaaaard */
+ if (ehc->i.flags & ATA_EHI_DID_RESET)
+ ehc->i.action |= ATA_EH_HARDRESET;
+ else
+ ehc->i.action |= ATA_EH_SOFTRESET;
+ }
+
+ if (ata_port_nr_enabled(ap)) {
+ ata_port_printk(ap, KERN_WARNING, "failed to recover some "
+ "devices, retrying in 5 secs\n");
+ ssleep(5);
+ } else {
+ /* no device left, repeat fast */
+ msleep(500);
+ }
+
+ goto retry;
+
+ out:
+ if (rc) {
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ ata_dev_disable(&ap->device[i]);
+ }
+
+ DPRINTK("EXIT, rc=%d\n", rc);
+ return rc;
+}
+
+/**
+ * ata_eh_finish - finish up EH
+ * @ap: host port to finish EH for
+ *
+ * Recovery is complete. Clean up EH states and retry or finish
+ * failed qcs.
+ *
+ * LOCKING:
+ * None.
+ */
+static void ata_eh_finish(struct ata_port *ap)
+{
+ int tag;
+
+ /* retry or finish qcs */
+ for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+ struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+ if (!(qc->flags & ATA_QCFLAG_FAILED))
+ continue;
+
+ if (qc->err_mask) {
+ /* FIXME: Once EH migration is complete,
+ * generate sense data in this function,
+ * considering both err_mask and tf.
+ */
+ if (qc->err_mask & AC_ERR_INVALID)
+ ata_eh_qc_complete(qc);
+ else
+ ata_eh_qc_retry(qc);
+ } else {
+ if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
+ ata_eh_qc_complete(qc);
+ } else {
+ /* feed zero TF to sense generation */
+ memset(&qc->result_tf, 0, sizeof(qc->result_tf));
+ ata_eh_qc_retry(qc);
+ }
+ }
+ }
+}
+
+/**
+ * ata_do_eh - do standard error handling
+ * @ap: host port to handle error for
+ * @prereset: prereset method (can be NULL)
+ * @softreset: softreset method (can be NULL)
+ * @hardreset: hardreset method (can be NULL)
+ * @postreset: postreset method (can be NULL)
+ *
+ * Perform standard error handling sequence.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
+ ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+ ata_postreset_fn_t postreset)
+{
+ ata_eh_autopsy(ap);
+ ata_eh_report(ap);
+ ata_eh_recover(ap, prereset, softreset, hardreset, postreset);
+ ata_eh_finish(ap);
+}
+
+/**
+ * ata_eh_handle_port_suspend - perform port suspend operation
+ * @ap: port to suspend
+ *
+ * Suspend @ap.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+static void ata_eh_handle_port_suspend(struct ata_port *ap)
+{
+ unsigned long flags;
+ int rc = 0;
+
+ /* are we suspending? */
+ spin_lock_irqsave(ap->lock, flags);
+ if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
+ ap->pm_mesg.event == PM_EVENT_ON) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
+
+ /* suspend */
+ ata_eh_freeze_port(ap);
+
+ if (ap->ops->port_suspend)
+ rc = ap->ops->port_suspend(ap, ap->pm_mesg);
+
+ /* report result */
+ spin_lock_irqsave(ap->lock, flags);
+
+ ap->pflags &= ~ATA_PFLAG_PM_PENDING;
+ if (rc == 0)
+ ap->pflags |= ATA_PFLAG_SUSPENDED;
+ else
+ ata_port_schedule_eh(ap);
+
+ if (ap->pm_result) {
+ *ap->pm_result = rc;
+ ap->pm_result = NULL;
+ }
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ return;
+}
+
+/**
+ * ata_eh_handle_port_resume - perform port resume operation
+ * @ap: port to resume
+ *
+ * Resume @ap.
+ *
+ * This function also waits upto one second until all devices
+ * hanging off this port requests resume EH action. This is to
+ * prevent invoking EH and thus reset multiple times on resume.
+ *
+ * On DPM resume, where some of devices might not be resumed
+ * together, this may delay port resume upto one second, but such
+ * DPM resumes are rare and 1 sec delay isn't too bad.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+static void ata_eh_handle_port_resume(struct ata_port *ap)
+{
+ unsigned long timeout;
+ unsigned long flags;
+ int i, rc = 0;
+
+ /* are we resuming? */
+ spin_lock_irqsave(ap->lock, flags);
+ if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
+ ap->pm_mesg.event != PM_EVENT_ON) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ /* spurious? */
+ if (!(ap->pflags & ATA_PFLAG_SUSPENDED))
+ goto done;
+
+ if (ap->ops->port_resume)
+ rc = ap->ops->port_resume(ap);
+
+ /* give devices time to request EH */
+ timeout = jiffies + HZ; /* 1s max */
+ while (1) {
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+ unsigned int action = ata_eh_dev_action(dev);
+
+ if ((dev->flags & ATA_DFLAG_SUSPENDED) &&
+ !(action & ATA_EH_RESUME))
+ break;
+ }
+
+ if (i == ATA_MAX_DEVICES || time_after(jiffies, timeout))
+ break;
+ msleep(10);
+ }
+
+ done:
+ spin_lock_irqsave(ap->lock, flags);
+ ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
+ if (ap->pm_result) {
+ *ap->pm_result = rc;
+ ap->pm_result = NULL;
+ }
+ spin_unlock_irqrestore(ap->lock, flags);
+}
git://git.onelab.eu / linux-2.6.git / blobdiff