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path: root/drivers/ata/libata-eh.c
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Diffstat (limited to 'drivers/ata/libata-eh.c')
-rw-r--r--drivers/ata/libata-eh.c362
1 files changed, 335 insertions, 27 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index c1db2f234d2e..f2dd99122bd6 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -79,6 +79,8 @@ enum {
*/
ATA_EH_PRERESET_TIMEOUT = 10000,
ATA_EH_FASTDRAIN_INTERVAL = 3000,
+
+ ATA_EH_UA_TRIES = 5,
};
/* The following table determines how we sequence resets. Each entry
@@ -1357,6 +1359,37 @@ static int ata_eh_read_log_10h(struct ata_device *dev,
}
/**
+ * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
+ * @dev: target ATAPI device
+ * @r_sense_key: out parameter for sense_key
+ *
+ * Perform ATAPI TEST_UNIT_READY.
+ *
+ * LOCKING:
+ * EH context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, AC_ERR_* mask on failure.
+ */
+static unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
+{
+ u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
+ struct ata_taskfile tf;
+ unsigned int err_mask;
+
+ ata_tf_init(dev, &tf);
+
+ tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.command = ATA_CMD_PACKET;
+ tf.protocol = ATAPI_PROT_NODATA;
+
+ err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
+ if (err_mask == AC_ERR_DEV)
+ *r_sense_key = tf.feature >> 4;
+ return err_mask;
+}
+
+/**
* 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)
@@ -1756,7 +1789,7 @@ static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
static unsigned int ata_eh_speed_down(struct ata_device *dev,
unsigned int eflags, unsigned int err_mask)
{
- struct ata_link *link = dev->link;
+ struct ata_link *link = ata_dev_phys_link(dev);
int xfer_ok = 0;
unsigned int verdict;
unsigned int action = 0;
@@ -1880,7 +1913,8 @@ static void ata_eh_link_autopsy(struct ata_link *link)
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->dev->link != link)
+ if (!(qc->flags & ATA_QCFLAG_FAILED) ||
+ ata_dev_phys_link(qc->dev) != link)
continue;
/* inherit upper level err_mask */
@@ -1967,6 +2001,23 @@ void ata_eh_autopsy(struct ata_port *ap)
ata_port_for_each_link(link, ap)
ata_eh_link_autopsy(link);
+ /* Handle the frigging slave link. Autopsy is done similarly
+ * but actions and flags are transferred over to the master
+ * link and handled from there.
+ */
+ if (ap->slave_link) {
+ struct ata_eh_context *mehc = &ap->link.eh_context;
+ struct ata_eh_context *sehc = &ap->slave_link->eh_context;
+
+ ata_eh_link_autopsy(ap->slave_link);
+
+ ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
+ mehc->i.action |= sehc->i.action;
+ mehc->i.dev_action[1] |= sehc->i.dev_action[1];
+ mehc->i.flags |= sehc->i.flags;
+ ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
+ }
+
/* Autopsy of fanout ports can affect host link autopsy.
* Perform host link autopsy last.
*/
@@ -2001,7 +2052,8 @@ static void ata_eh_link_report(struct ata_link *link)
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->dev->link != link ||
+ if (!(qc->flags & ATA_QCFLAG_FAILED) ||
+ ata_dev_phys_link(qc->dev) != link ||
((qc->flags & ATA_QCFLAG_QUIET) &&
qc->err_mask == AC_ERR_DEV))
continue;
@@ -2068,7 +2120,7 @@ static void ata_eh_link_report(struct ata_link *link)
char cdb_buf[70] = "";
if (!(qc->flags & ATA_QCFLAG_FAILED) ||
- qc->dev->link != link || !qc->err_mask)
+ ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
continue;
if (qc->dma_dir != DMA_NONE) {
@@ -2160,12 +2212,14 @@ void ata_eh_report(struct ata_port *ap)
}
static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
- unsigned int *classes, unsigned long deadline)
+ unsigned int *classes, unsigned long deadline,
+ bool clear_classes)
{
struct ata_device *dev;
- ata_link_for_each_dev(dev, link)
- classes[dev->devno] = ATA_DEV_UNKNOWN;
+ if (clear_classes)
+ ata_link_for_each_dev(dev, link)
+ classes[dev->devno] = ATA_DEV_UNKNOWN;
return reset(link, classes, deadline);
}
@@ -2187,17 +2241,20 @@ int ata_eh_reset(struct ata_link *link, int classify,
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
{
struct ata_port *ap = link->ap;
+ struct ata_link *slave = ap->slave_link;
struct ata_eh_context *ehc = &link->eh_context;
+ struct ata_eh_context *sehc = &slave->eh_context;
unsigned int *classes = ehc->classes;
unsigned int lflags = link->flags;
int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
int max_tries = 0, try = 0;
+ struct ata_link *failed_link;
struct ata_device *dev;
unsigned long deadline, now;
ata_reset_fn_t reset;
unsigned long flags;
u32 sstatus;
- int nr_known, rc;
+ int nr_unknown, rc;
/*
* Prepare to reset
@@ -2252,8 +2309,30 @@ int ata_eh_reset(struct ata_link *link, int classify,
}
if (prereset) {
- rc = prereset(link,
- ata_deadline(jiffies, ATA_EH_PRERESET_TIMEOUT));
+ unsigned long deadline = ata_deadline(jiffies,
+ ATA_EH_PRERESET_TIMEOUT);
+
+ if (slave) {
+ sehc->i.action &= ~ATA_EH_RESET;
+ sehc->i.action |= ehc->i.action;
+ }
+
+ rc = prereset(link, deadline);
+
+ /* If present, do prereset on slave link too. Reset
+ * is skipped iff both master and slave links report
+ * -ENOENT or clear ATA_EH_RESET.
+ */
+ if (slave && (rc == 0 || rc == -ENOENT)) {
+ int tmp;
+
+ tmp = prereset(slave, deadline);
+ if (tmp != -ENOENT)
+ rc = tmp;
+
+ ehc->i.action |= sehc->i.action;
+ }
+
if (rc) {
if (rc == -ENOENT) {
ata_link_printk(link, KERN_DEBUG,
@@ -2302,25 +2381,51 @@ int ata_eh_reset(struct ata_link *link, int classify,
else
ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
- rc = ata_do_reset(link, reset, classes, deadline);
- if (rc && rc != -EAGAIN)
+ rc = ata_do_reset(link, reset, classes, deadline, true);
+ if (rc && rc != -EAGAIN) {
+ failed_link = link;
goto fail;
+ }
+
+ /* hardreset slave link if existent */
+ if (slave && reset == hardreset) {
+ int tmp;
+
+ if (verbose)
+ ata_link_printk(slave, KERN_INFO,
+ "hard resetting link\n");
+ ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
+ tmp = ata_do_reset(slave, reset, classes, deadline,
+ false);
+ switch (tmp) {
+ case -EAGAIN:
+ rc = -EAGAIN;
+ case 0:
+ break;
+ default:
+ failed_link = slave;
+ rc = tmp;
+ goto fail;
+ }
+ }
+
+ /* perform follow-up SRST if necessary */
if (reset == hardreset &&
ata_eh_followup_srst_needed(link, rc, classes)) {
- /* okay, let's do follow-up softreset */
reset = softreset;
if (!reset) {
ata_link_printk(link, KERN_ERR,
"follow-up softreset required "
"but no softreset avaliable\n");
+ failed_link = link;
rc = -EINVAL;
goto fail;
}
ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
- rc = ata_do_reset(link, reset, classes, deadline);
+ rc = ata_do_reset(link, reset, classes, deadline, true);
}
} else {
if (verbose)
@@ -2341,7 +2446,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
dev->pio_mode = XFER_PIO_0;
dev->flags &= ~ATA_DFLAG_SLEEPING;
- if (ata_link_offline(link))
+ if (ata_phys_link_offline(ata_dev_phys_link(dev)))
continue;
/* apply class override */
@@ -2354,6 +2459,8 @@ int ata_eh_reset(struct ata_link *link, int classify,
/* record current link speed */
if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
link->sata_spd = (sstatus >> 4) & 0xf;
+ if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
+ slave->sata_spd = (sstatus >> 4) & 0xf;
/* thaw the port */
if (ata_is_host_link(link))
@@ -2366,12 +2473,17 @@ int ata_eh_reset(struct ata_link *link, int classify,
* reset and here. This race is mediated by cross checking
* link onlineness and classification result later.
*/
- if (postreset)
+ if (postreset) {
postreset(link, classes);
+ if (slave)
+ postreset(slave, classes);
+ }
/* clear cached SError */
spin_lock_irqsave(link->ap->lock, flags);
link->eh_info.serror = 0;
+ if (slave)
+ slave->eh_info.serror = 0;
spin_unlock_irqrestore(link->ap->lock, flags);
/* Make sure onlineness and classification result correspond.
@@ -2381,19 +2493,21 @@ int ata_eh_reset(struct ata_link *link, int classify,
* link onlineness and classification result, those conditions
* can be reliably detected and retried.
*/
- nr_known = 0;
+ nr_unknown = 0;
ata_link_for_each_dev(dev, link) {
/* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */
- if (classes[dev->devno] == ATA_DEV_UNKNOWN)
+ if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
classes[dev->devno] = ATA_DEV_NONE;
- else
- nr_known++;
+ if (ata_phys_link_online(ata_dev_phys_link(dev)))
+ nr_unknown++;
+ }
}
- if (classify && !nr_known && ata_link_online(link)) {
+ if (classify && nr_unknown) {
if (try < max_tries) {
ata_link_printk(link, KERN_WARNING, "link online but "
"device misclassified, retrying\n");
+ failed_link = link;
rc = -EAGAIN;
goto fail;
}
@@ -2404,6 +2518,8 @@ int ata_eh_reset(struct ata_link *link, int classify,
/* reset successful, schedule revalidation */
ata_eh_done(link, NULL, ATA_EH_RESET);
+ if (slave)
+ ata_eh_done(slave, NULL, ATA_EH_RESET);
ehc->last_reset = jiffies;
ehc->i.action |= ATA_EH_REVALIDATE;
@@ -2411,6 +2527,8 @@ int ata_eh_reset(struct ata_link *link, int classify,
out:
/* clear hotplug flag */
ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
+ if (slave)
+ sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
spin_lock_irqsave(ap->lock, flags);
ap->pflags &= ~ATA_PFLAG_RESETTING;
@@ -2431,7 +2549,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
if (time_before(now, deadline)) {
unsigned long delta = deadline - now;
- ata_link_printk(link, KERN_WARNING,
+ ata_link_printk(failed_link, KERN_WARNING,
"reset failed (errno=%d), retrying in %u secs\n",
rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
@@ -2439,13 +2557,92 @@ int ata_eh_reset(struct ata_link *link, int classify,
delta = schedule_timeout_uninterruptible(delta);
}
- if (rc == -EPIPE || try == max_tries - 1)
+ if (try == max_tries - 1) {
sata_down_spd_limit(link);
+ if (slave)
+ sata_down_spd_limit(slave);
+ } else if (rc == -EPIPE)
+ sata_down_spd_limit(failed_link);
+
if (hardreset)
reset = hardreset;
goto retry;
}
+static inline void ata_eh_pull_park_action(struct ata_port *ap)
+{
+ struct ata_link *link;
+ struct ata_device *dev;
+ unsigned long flags;
+
+ /*
+ * This function can be thought of as an extended version of
+ * ata_eh_about_to_do() specially crafted to accommodate the
+ * requirements of ATA_EH_PARK handling. Since the EH thread
+ * does not leave the do {} while () loop in ata_eh_recover as
+ * long as the timeout for a park request to *one* device on
+ * the port has not expired, and since we still want to pick
+ * up park requests to other devices on the same port or
+ * timeout updates for the same device, we have to pull
+ * ATA_EH_PARK actions from eh_info into eh_context.i
+ * ourselves at the beginning of each pass over the loop.
+ *
+ * Additionally, all write accesses to &ap->park_req_pending
+ * through INIT_COMPLETION() (see below) or complete_all()
+ * (see ata_scsi_park_store()) are protected by the host lock.
+ * As a result we have that park_req_pending.done is zero on
+ * exit from this function, i.e. when ATA_EH_PARK actions for
+ * *all* devices on port ap have been pulled into the
+ * respective eh_context structs. If, and only if,
+ * park_req_pending.done is non-zero by the time we reach
+ * wait_for_completion_timeout(), another ATA_EH_PARK action
+ * has been scheduled for at least one of the devices on port
+ * ap and we have to cycle over the do {} while () loop in
+ * ata_eh_recover() again.
+ */
+
+ spin_lock_irqsave(ap->lock, flags);
+ INIT_COMPLETION(ap->park_req_pending);
+ ata_port_for_each_link(link, ap) {
+ ata_link_for_each_dev(dev, link) {
+ struct ata_eh_info *ehi = &link->eh_info;
+
+ link->eh_context.i.dev_action[dev->devno] |=
+ ehi->dev_action[dev->devno] & ATA_EH_PARK;
+ ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
+ }
+ }
+ spin_unlock_irqrestore(ap->lock, flags);
+}
+
+static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
+{
+ struct ata_eh_context *ehc = &dev->link->eh_context;
+ struct ata_taskfile tf;
+ unsigned int err_mask;
+
+ ata_tf_init(dev, &tf);
+ if (park) {
+ ehc->unloaded_mask |= 1 << dev->devno;
+ tf.command = ATA_CMD_IDLEIMMEDIATE;
+ tf.feature = 0x44;
+ tf.lbal = 0x4c;
+ tf.lbam = 0x4e;
+ tf.lbah = 0x55;
+ } else {
+ ehc->unloaded_mask &= ~(1 << dev->devno);
+ tf.command = ATA_CMD_CHK_POWER;
+ }
+
+ tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
+ tf.protocol |= ATA_PROT_NODATA;
+ err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+ if (park && (err_mask || tf.lbal != 0xc4)) {
+ ata_dev_printk(dev, KERN_ERR, "head unload failed!\n");
+ ehc->unloaded_mask &= ~(1 << dev->devno);
+ }
+}
+
static int ata_eh_revalidate_and_attach(struct ata_link *link,
struct ata_device **r_failed_dev)
{
@@ -2472,7 +2669,7 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
WARN_ON(dev->class == ATA_DEV_PMP);
- if (ata_link_offline(link)) {
+ if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
rc = -EIO;
goto err;
}
@@ -2610,6 +2807,53 @@ int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
return rc;
}
+/**
+ * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
+ * @dev: ATAPI device to clear UA for
+ *
+ * Resets and other operations can make an ATAPI device raise
+ * UNIT ATTENTION which causes the next operation to fail. This
+ * function clears UA.
+ *
+ * LOCKING:
+ * EH context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int atapi_eh_clear_ua(struct ata_device *dev)
+{
+ int i;
+
+ for (i = 0; i < ATA_EH_UA_TRIES; i++) {
+ u8 sense_buffer[SCSI_SENSE_BUFFERSIZE];
+ u8 sense_key = 0;
+ unsigned int err_mask;
+
+ err_mask = atapi_eh_tur(dev, &sense_key);
+ if (err_mask != 0 && err_mask != AC_ERR_DEV) {
+ ata_dev_printk(dev, KERN_WARNING, "TEST_UNIT_READY "
+ "failed (err_mask=0x%x)\n", err_mask);
+ return -EIO;
+ }
+
+ if (!err_mask || sense_key != UNIT_ATTENTION)
+ return 0;
+
+ err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
+ if (err_mask) {
+ ata_dev_printk(dev, KERN_WARNING, "failed to clear "
+ "UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
+ return -EIO;
+ }
+ }
+
+ ata_dev_printk(dev, KERN_WARNING,
+ "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES);
+
+ return 0;
+}
+
static int ata_link_nr_enabled(struct ata_link *link)
{
struct ata_device *dev;
@@ -2697,7 +2941,7 @@ static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
/* This is the last chance, better to slow
* down than lose it.
*/
- sata_down_spd_limit(dev->link);
+ sata_down_spd_limit(ata_dev_phys_link(dev));
ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
}
}
@@ -2707,7 +2951,7 @@ static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
ata_dev_disable(dev);
/* detach if offline */
- if (ata_link_offline(dev->link))
+ if (ata_phys_link_offline(ata_dev_phys_link(dev)))
ata_eh_detach_dev(dev);
/* schedule probe if necessary */
@@ -2755,7 +2999,7 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
struct ata_device *dev;
int nr_failed_devs;
int rc;
- unsigned long flags;
+ unsigned long flags, deadline;
DPRINTK("ENTER\n");
@@ -2829,6 +3073,56 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
}
}
+ do {
+ unsigned long now;
+
+ /*
+ * clears ATA_EH_PARK in eh_info and resets
+ * ap->park_req_pending
+ */
+ ata_eh_pull_park_action(ap);
+
+ deadline = jiffies;
+ ata_port_for_each_link(link, ap) {
+ ata_link_for_each_dev(dev, link) {
+ struct ata_eh_context *ehc = &link->eh_context;
+ unsigned long tmp;
+
+ if (dev->class != ATA_DEV_ATA)
+ continue;
+ if (!(ehc->i.dev_action[dev->devno] &
+ ATA_EH_PARK))
+ continue;
+ tmp = dev->unpark_deadline;
+ if (time_before(deadline, tmp))
+ deadline = tmp;
+ else if (time_before_eq(tmp, jiffies))
+ continue;
+ if (ehc->unloaded_mask & (1 << dev->devno))
+ continue;
+
+ ata_eh_park_issue_cmd(dev, 1);
+ }
+ }
+
+ now = jiffies;
+ if (time_before_eq(deadline, now))
+ break;
+
+ deadline = wait_for_completion_timeout(&ap->park_req_pending,
+ deadline - now);
+ } while (deadline);
+ ata_port_for_each_link(link, ap) {
+ ata_link_for_each_dev(dev, link) {
+ if (!(link->eh_context.unloaded_mask &
+ (1 << dev->devno)))
+ continue;
+
+ ata_eh_park_issue_cmd(dev, 0);
+ ata_eh_done(link, dev, ATA_EH_PARK);
+ }
+ }
+
/* the rest */
ata_port_for_each_link(link, ap) {
struct ata_eh_context *ehc = &link->eh_context;
@@ -2852,6 +3146,20 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
ehc->i.flags &= ~ATA_EHI_SETMODE;
}
+ /* If reset has been issued, clear UA to avoid
+ * disrupting the current users of the device.
+ */
+ if (ehc->i.flags & ATA_EHI_DID_RESET) {
+ ata_link_for_each_dev(dev, link) {
+ if (dev->class != ATA_DEV_ATAPI)
+ continue;
+ rc = atapi_eh_clear_ua(dev);
+ if (rc)
+ goto dev_fail;
+ }
+ }
+
+ /* configure link power saving */
if (ehc->i.action & ATA_EH_LPM)
ata_link_for_each_dev(dev, link)
ata_dev_enable_pm(dev, ap->pm_policy);