Implement new EH. The exported interface is ata_do_eh() which is to
be called from ->error_handler and performs the following steps to
recover the failed port.
ata_eh_autopsy() : analyze SError/TF, determine the cause of failure
and required recovery actions and record it in
ap->eh_context
ata_eh_report() : report the failure to user
ata_eh_recover() : perform recovery actions described in ap->eh_context
ata_eh_finish() : finish failed qcs
LLDDs can customize error handling by modifying eh_context before
calling ata_do_eh() or, if necessary, doing so inbetween each major
steps by calling each step explicitly.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/scsi/libata-core.c | 1
drivers/scsi/libata-eh.c | 775 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/libata.h | 5
3 files changed, 781 insertions(+), 0 deletions(-)
09973781fb6f52e6592be1aeb155547c3941370d
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index afb7796..35faf66 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -5440,3 +5440,4 @@ EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
+EXPORT_SYMBOL_GPL(ata_do_eh);
diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 5a76e22..41b36c5 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -632,3 +632,778 @@ void ata_eh_qc_retry(struct ata_queued_c
scmd->retries--;
__ata_eh_qc_complete(qc);
}
+
+/**
+ * ata_eh_about_to_do - about to perform eh_action
+ * @ap: target ATA port
+ * @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, unsigned int action)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ap->host_set->lock, flags);
+ ap->eh_info.action &= ~action;
+ ap->flags |= ATA_FLAG_RECOVERED;
+ spin_unlock_irqrestore(&ap->host_set->lock, flags);
+}
+
+/**
+ * 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";
+}
+
+/**
+ * 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_device *dev,
+ unsigned char *sense_buf)
+{
+ struct ata_port *ap = dev->ap;
+ struct ata_taskfile tf;
+ u8 cdb[ATAPI_CDB_LEN];
+
+ DPRINTK("ATAPI request sense\n");
+
+ ata_tf_init(dev, &tf);
+
+ /* FIXME: is this needed? */
+ memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
+
+ /* XXX: why tf_read here? */
+ ap->ops->tf_read(ap, &tf);
+
+ /* fill these in, for the case where they are -not- overwritten */
+ sense_buf[0] = 0x70;
+ sense_buf[2] = tf.feature >> 4;
+
+ 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)) {
+ err_mask |= AC_ERR_ATA_BUS;
+ action |= ATA_EH_HARDRESET;
+ }
+
+ ehc->i.err_mask |= err_mask;
+ ehc->i.action |= action;
+}
+
+/**
+ * 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:
+ tmp = atapi_eh_request_sense(qc->dev,
+ qc->scsicmd->sense_buffer);
+ 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 (ata_down_sata_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 action = ehc->i.action;
+ struct ata_device *failed_dev = NULL;
+ unsigned int all_err_mask = 0;
+ int tag, is_io = 0;
+ u32 serror;
+ int rc;
+
+ DPRINTK("ENTER\n");
+
+ /* obtain and analyze SError */
+ rc = ata_scr_read(ap, SCR_ERROR, &serror);
+ if (rc == 0) {
+ ehc->i.serror |= serror;
+ ata_eh_analyze_serror(ap);
+ } else if (rc != -EOPNOTSUPP)
+ action |= ATA_EH_HARDRESET;
+
+ /* 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;
+
+ if (qc->err_mask & AC_ERR_TIMEOUT)
+ action |= ATA_EH_SOFTRESET;
+
+ /* analyze TF */
+ 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);
+ action &= ~ATA_EH_REVALIDATE;
+ }
+
+ /* accumulate error info */
+ failed_dev = qc->dev;
+ all_err_mask |= qc->err_mask;
+ if (qc->flags & ATA_QCFLAG_IO)
+ is_io = 1;
+ }
+
+ /* speed down iff command was in progress */
+ if (failed_dev)
+ action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask);
+
+ if (all_err_mask)
+ action |= ATA_EH_REVALIDATE;
+
+ ehc->i.dev = failed_dev;
+ ehc->i.action = action;
+
+ 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->flags & ATA_FLAG_FROZEN)
+ frozen = " frozen";
+
+ if (ehc->i.dev) {
+ ata_dev_printk(ehc->i.dev, KERN_ERR,
+ "exception Emask 0x%x SErr 0x%x action 0x%x%s\n",
+ ehc->i.err_mask, 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 SErr 0x%x action 0x%x%s\n",
+ ehc->i.err_mask, 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++) {
+ struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+ if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask)
+ continue;
+
+ ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x "
+ "Emask 0x%x stat 0x%x err 0x%x (%s)\n",
+ qc->tag, qc->tf.command, qc->err_mask,
+ qc->result_tf.command, qc->result_tf.feature,
+ ata_err_string(qc->err_mask));
+ }
+}
+
+static int ata_eh_reset(struct ata_port *ap, 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[ATA_MAX_DEVICES];
+ int tries = ATA_EH_RESET_TRIES;
+ ata_reset_fn_t reset;
+ int rc;
+
+ if (softreset && (!hardreset || (!ata_set_sata_spd_needed(ap) &&
+ !(ehc->i.action & ATA_EH_HARDRESET))))
+ reset = softreset;
+ else
+ reset = hardreset;
+
+ retry:
+ ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
+ reset == softreset ? "soft" : "hard");
+
+ /* reset */
+ ata_eh_about_to_do(ap, ATA_EH_RESET_MASK);
+ ehc->flags |= ATA_EHC_DID_RESET;
+
+ rc = ata_do_reset(ap, reset, classes);
+
+ if (rc && --tries) {
+ ata_port_printk(ap, KERN_WARNING,
+ "%sreset failed, retrying in 5 secs\n",
+ reset == softreset ? "soft" : "hard");
+ ssleep(5);
+
+ if (reset == hardreset)
+ ata_down_sata_spd_limit(ap);
+ if (hardreset)
+ reset = hardreset;
+ goto retry;
+ }
+
+ if (rc == 0) {
+ if (postreset)
+ postreset(ap, classes);
+
+ /* reset successful, schedule revalidation */
+ ehc->i.dev = NULL;
+ ehc->i.action &= ~ATA_EH_RESET_MASK;
+ ehc->i.action |= ATA_EH_REVALIDATE;
+ }
+
+ return rc;
+}
+
+static int ata_eh_revalidate(struct ata_port *ap,
+ struct ata_device **r_failed_dev)
+{
+ struct ata_eh_context *ehc = &ap->eh_context;
+ struct ata_device *dev;
+ int i, rc = 0;
+
+ DPRINTK("ENTER\n");
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ dev = &ap->device[i];
+
+ if (ehc->i.action & ATA_EH_REVALIDATE && ata_dev_enabled(dev) &&
+ (!ehc->i.dev || ehc->i.dev == dev)) {
+ if (ata_port_offline(ap)) {
+ rc = -EIO;
+ break;
+ }
+
+ ata_eh_about_to_do(ap, ATA_EH_REVALIDATE);
+ rc = ata_dev_revalidate(dev,
+ ehc->flags & ATA_EHC_DID_RESET);
+ if (rc)
+ break;
+
+ ehc->i.action &= ~ATA_EH_REVALIDATE;
+ }
+ }
+
+ if (rc)
+ *r_failed_dev = dev;
+
+ DPRINTK("EXIT\n");
+ return rc;
+}
+
+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;
+}
+
+/**
+ * ata_eh_recover - recover host port after error
+ * @ap: host port to recover
+ * @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 each devices are recorded in eh_context. This
+ * function executes all the operations with appropriate retrials
+ * and fallbacks to resurrect failed devices.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int ata_eh_recover(struct ata_port *ap, 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;
+ }
+
+ retry:
+ down_xfermask = 0;
+ rc = 0;
+
+ /* skip EH if possible. */
+ if (!ata_port_nr_enabled(ap) && !(ap->flags & ATA_FLAG_FROZEN))
+ ehc->i.action = 0;
+
+ /* reset */
+ if (ehc->i.action & ATA_EH_RESET_MASK) {
+ ata_eh_freeze_port(ap);
+
+ rc = ata_eh_reset(ap, 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 */
+ rc = ata_eh_revalidate(ap, &dev);
+ if (rc)
+ goto dev_fail;
+
+ /* configure transfer mode if the port has been reset */
+ if (ehc->flags & ATA_EHC_DID_RESET) {
+ rc = ata_set_mode(ap, &dev);
+ if (rc) {
+ down_xfermask = 1;
+ goto dev_fail;
+ }
+ }
+
+ goto out;
+
+ dev_fail:
+ switch (rc) {
+ case -ENODEV:
+ case -EINVAL:
+ ehc->tries[dev->devno] = 0;
+ break;
+ case -EIO:
+ ata_down_sata_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;
+ }
+
+ /* disable device if it has used up all its chances */
+ if (ata_dev_enabled(dev) && !ehc->tries[dev->devno])
+ ata_dev_disable(dev);
+
+ /* soft didn't work? be haaaaard */
+ if (ehc->flags & ATA_EHC_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
+ * @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_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, softreset, hardreset, postreset);
+ ata_eh_finish(ap);
+}
diff --git a/include/linux/libata.h b/include/linux/libata.h
index c5c5f18..867f1d5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -246,6 +246,8 @@ enum {
/* how hard are we gonna try to probe/recover devices */
ATA_PROBE_MAX_TRIES = 3,
+ ATA_EH_RESET_TRIES = 3,
+ ATA_EH_DEV_TRIES = 3,
};
enum hsm_task_states {
@@ -730,6 +732,9 @@ extern void ata_eh_thaw_port(struct ata_
extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
+extern void ata_do_eh(struct ata_port *ap, ata_reset_fn_t softreset,
+ ata_reset_fn_t hardreset, ata_postreset_fn_t postreset);
+
/*
* printk helpers
*/
--
1.2.4
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