#include "libata.h"
+enum {
+ ATA_EH_SPDN_NCQ_OFF = (1 << 0),
+ ATA_EH_SPDN_SPEED_DOWN = (1 << 1),
+ ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2),
+};
+
static void __ata_port_freeze(struct ata_port *ap);
static void ata_eh_finish(struct ata_port *ap);
+#ifdef CONFIG_PM
static void ata_eh_handle_port_suspend(struct ata_port *ap);
static void ata_eh_handle_port_resume(struct ata_port *ap);
+static int ata_eh_suspend(struct ata_port *ap,
+ struct ata_device **r_failed_dev);
+static void ata_eh_prep_resume(struct ata_port *ap);
+static int ata_eh_resume(struct ata_port *ap, struct ata_device **r_failed_dev);
+#else /* CONFIG_PM */
+static void ata_eh_handle_port_suspend(struct ata_port *ap)
+{ }
+
+static void ata_eh_handle_port_resume(struct ata_port *ap)
+{ }
+
+static int ata_eh_suspend(struct ata_port *ap, struct ata_device **r_failed_dev)
+{
+ return 0;
+}
+
+static void ata_eh_prep_resume(struct ata_port *ap)
+{ }
+
+static int ata_eh_resume(struct ata_port *ap, struct ata_device **r_failed_dev)
+{
+ return 0;
+}
+#endif /* CONFIG_PM */
static void ata_ering_record(struct ata_ering *ering, int is_io,
unsigned int err_mask)
ent->timestamp = get_jiffies_64();
}
-static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering)
+static void ata_ering_clear(struct ata_ering *ering)
{
- struct ata_ering_entry *ent = &ering->ring[ering->cursor];
- if (!ent->err_mask)
- return NULL;
- return ent;
+ memset(ering, 0, sizeof(*ering));
}
static int ata_ering_map(struct ata_ering *ering,
ap->pflags |= ATA_PFLAG_FROZEN;
- DPRINTK("ata%u port frozen\n", ap->id);
+ DPRINTK("ata%u port frozen\n", ap->print_id);
}
/**
spin_unlock_irqrestore(ap->lock, flags);
- DPRINTK("ata%u port thawed\n", ap->id);
+ DPRINTK("ata%u port thawed\n", ap->print_id);
}
static void ata_eh_scsidone(struct scsi_cmnd *scmd)
return action;
}
-static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent)
+static int ata_eh_categorize_error(int is_io, unsigned int err_mask)
{
- if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT))
+ if (err_mask & AC_ERR_ATA_BUS)
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)
+ if (err_mask & AC_ERR_TIMEOUT)
+ return 2;
+
+ if (is_io) {
+ if (err_mask & AC_ERR_HSM)
return 2;
+ if ((err_mask &
+ (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
+ return 3;
}
return 0;
}
-struct speed_down_needed_arg {
+struct speed_down_verdict_arg {
u64 since;
- int nr_errors[3];
+ int nr_errors[4];
};
-static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg)
+static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
{
- struct speed_down_needed_arg *arg = void_arg;
+ struct speed_down_verdict_arg *arg = void_arg;
+ int cat = ata_eh_categorize_error(ent->is_io, ent->err_mask);
if (ent->timestamp < arg->since)
return -1;
- arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++;
+ arg->nr_errors[cat]++;
return 0;
}
/**
- * ata_eh_speed_down_needed - Determine wheter speed down is necessary
+ * ata_eh_speed_down_verdict - Determine speed down verdict
* @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.
+ * whether NCQ needs to be turned off, transfer speed should be
+ * stepped down, or falling back to PIO is necessary.
+ *
+ * Cat-1 is ATA_BUS error for any command.
*
- * Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM
- * violation for known supported commands.
+ * Cat-2 is TIMEOUT for any command or HSM violation for known
+ * supported commands.
*
- * Cat-2 errors are unclassified DEV error for known supported
+ * Cat-3 is is unclassified DEV error for known supported
* command.
*
+ * NCQ needs to be turned off if there have been more than 3
+ * Cat-2 + Cat-3 errors during last 10 minutes.
+ *
+ * Speed down is necessary if there have been more than 3 Cat-1 +
+ * Cat-2 errors or 10 Cat-3 errors during last 10 minutes.
+ *
+ * Falling back to PIO mode is necessary if there have been more
+ * than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes.
+ *
* LOCKING:
* Inherited from caller.
*
* RETURNS:
- * 1 if speed down is necessary, 0 otherwise
+ * OR of ATA_EH_SPDN_* flags.
*/
-static int ata_eh_speed_down_needed(struct ata_device *dev)
+static unsigned int ata_eh_speed_down_verdict(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;
+ const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
+ u64 j64 = get_jiffies_64();
+ struct speed_down_verdict_arg arg;
+ unsigned int verdict = 0;
- ent = ata_ering_top(&dev->ering);
- if (!ent)
- return 0;
+ /* scan past 10 mins of error history */
+ memset(&arg, 0, sizeof(arg));
+ arg.since = j64 - min(j64, j10mins);
+ ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
- err_cat = ata_eh_categorize_ering_entry(ent);
- if (err_cat == 0)
- return 0;
+ if (arg.nr_errors[2] + arg.nr_errors[3] > 3)
+ verdict |= ATA_EH_SPDN_NCQ_OFF;
+ if (arg.nr_errors[1] + arg.nr_errors[2] > 3 || arg.nr_errors[3] > 10)
+ verdict |= ATA_EH_SPDN_SPEED_DOWN;
+ /* scan past 3 mins of error history */
memset(&arg, 0, sizeof(arg));
+ arg.since = j64 - min(j64, j5mins);
+ ata_ering_map(&dev->ering, speed_down_verdict_cb, &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);
+ if (arg.nr_errors[1] + arg.nr_errors[2] + arg.nr_errors[3] > 10)
+ verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
- return arg.nr_errors[err_cat] > err_limits[err_cat];
+ return verdict;
}
/**
* Kernel thread context (may sleep).
*
* RETURNS:
- * 0 on success, -errno otherwise
+ * Determined recovery action.
*/
-static int ata_eh_speed_down(struct ata_device *dev, int is_io,
- unsigned int err_mask)
+static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io,
+ unsigned int err_mask)
{
- if (!err_mask)
+ unsigned int verdict;
+ unsigned int action = 0;
+
+ /* don't bother if Cat-0 error */
+ if (ata_eh_categorize_error(is_io, err_mask) == 0)
return 0;
/* record error and determine whether speed down is necessary */
ata_ering_record(&dev->ering, is_io, err_mask);
+ verdict = ata_eh_speed_down_verdict(dev);
- if (!ata_eh_speed_down_needed(dev))
- return 0;
+ /* turn off NCQ? */
+ if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
+ (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
+ ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
+ dev->flags |= ATA_DFLAG_NCQ_OFF;
+ ata_dev_printk(dev, KERN_WARNING,
+ "NCQ disabled due to excessive errors\n");
+ goto done;
+ }
- /* speed down SATA link speed if possible */
- if (sata_down_spd_limit(dev->ap) == 0)
- return ATA_EH_HARDRESET;
+ /* speed down? */
+ if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
+ /* speed down SATA link speed if possible */
+ if (sata_down_spd_limit(dev->ap) == 0) {
+ action |= ATA_EH_HARDRESET;
+ goto done;
+ }
- /* lower transfer mode */
- if (ata_down_xfermask_limit(dev, 0) == 0)
- return ATA_EH_SOFTRESET;
+ /* lower transfer mode */
+ if (dev->spdn_cnt < 2) {
+ static const int dma_dnxfer_sel[] =
+ { ATA_DNXFER_DMA, ATA_DNXFER_40C };
+ static const int pio_dnxfer_sel[] =
+ { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
+ int sel;
+
+ if (dev->xfer_shift != ATA_SHIFT_PIO)
+ sel = dma_dnxfer_sel[dev->spdn_cnt];
+ else
+ sel = pio_dnxfer_sel[dev->spdn_cnt];
+
+ dev->spdn_cnt++;
+
+ if (ata_down_xfermask_limit(dev, sel) == 0) {
+ action |= ATA_EH_SOFTRESET;
+ goto done;
+ }
+ }
+ }
+
+ /* Fall back to PIO? Slowing down to PIO is meaningless for
+ * SATA. Consider it only for PATA.
+ */
+ if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
+ (dev->ap->cbl != ATA_CBL_SATA) &&
+ (dev->xfer_shift != ATA_SHIFT_PIO)) {
+ if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
+ dev->spdn_cnt = 0;
+ action |= ATA_EH_SOFTRESET;
+ goto done;
+ }
+ }
- ata_dev_printk(dev, KERN_ERR,
- "speed down requested but no transfer mode left\n");
return 0;
+ done:
+ /* device has been slowed down, blow error history */
+ ata_ering_clear(&dev->ering);
+ return action;
}
/**
rc = prereset(ap);
if (rc) {
if (rc == -ENOENT) {
- ata_port_printk(ap, KERN_DEBUG, "port disabled. ignoring.\n");
+ ata_port_printk(ap, KERN_DEBUG,
+ "port disabled. ignoring.\n");
ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ classes[i] = ATA_DEV_NONE;
+
+ rc = 0;
} else
ata_port_printk(ap, KERN_ERR,
"prereset failed (errno=%d)\n", rc);
{
struct ata_eh_context *ehc = &ap->eh_context;
struct ata_device *dev;
+ unsigned int new_mask = 0;
unsigned long flags;
int i, rc = 0;
DPRINTK("ENTER\n");
- for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ /* For PATA drive side cable detection to work, IDENTIFY must
+ * be done backwards such that PDIAG- is released by the slave
+ * device before the master device is identified.
+ */
+ for (i = ATA_MAX_DEVICES - 1; i >= 0; i--) {
unsigned int action, readid_flags = 0;
dev = &ap->device[i];
if (action & ATA_EH_REVALIDATE && ata_dev_ready(dev)) {
if (ata_port_offline(ap)) {
rc = -EIO;
- break;
+ goto err;
}
ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
rc = ata_dev_revalidate(dev, readid_flags);
if (rc)
- break;
+ goto err;
ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
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) {
+ switch (rc) {
+ case 0:
+ new_mask |= 1 << i;
+ break;
+ case -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;
+ default:
+ dev->class = ATA_DEV_UNKNOWN;
+ goto err;
}
+ }
+ }
- if (ata_dev_enabled(dev)) {
- spin_lock_irqsave(ap->lock, flags);
- ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
- spin_unlock_irqrestore(ap->lock, flags);
+ /* Configure new devices forward such that user doesn't see
+ * device detection messages backwards.
+ */
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ dev = &ap->device[i];
- /* new device discovered, configure xfermode */
- ehc->i.flags |= ATA_EHI_SETMODE;
- }
- }
+ if (!(new_mask & (1 << i)))
+ continue;
+
+ ehc->i.flags |= ATA_EHI_PRINTINFO;
+ rc = ata_dev_configure(dev);
+ ehc->i.flags &= ~ATA_EHI_PRINTINFO;
+ if (rc)
+ goto err;
+
+ 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;
+ return 0;
- DPRINTK("EXIT\n");
+ err:
+ *r_failed_dev = dev;
+ DPRINTK("EXIT rc=%d\n", rc);
return rc;
}
+#ifdef CONFIG_PM
/**
* ata_eh_suspend - handle suspend EH action
* @ap: target host port
DPRINTK("EXIT\n");
return 0;
}
+#endif /* CONFIG_PM */
static int ata_port_nr_enabled(struct ata_port *ap)
{
{
struct ata_eh_context *ehc = &ap->eh_context;
struct ata_device *dev;
- int down_xfermask, i, rc;
+ int i, rc;
DPRINTK("ENTER\n");
}
retry:
- down_xfermask = 0;
rc = 0;
/* if UNLOADING, finish immediately */
/* configure transfer mode if necessary */
if (ehc->i.flags & ATA_EHI_SETMODE) {
rc = ata_set_mode(ap, &dev);
- if (rc) {
- down_xfermask = 1;
+ if (rc)
goto dev_fail;
- }
ehc->i.flags &= ~ATA_EHI_SETMODE;
}
goto out;
dev_fail:
+ ehc->tries[dev->devno]--;
+
switch (rc) {
- case -ENODEV:
- /* device missing, schedule probing */
- ehc->i.probe_mask |= (1 << dev->devno);
case -EINVAL:
+ /* eeek, something went very wrong, give up */
ehc->tries[dev->devno] = 0;
break;
+
+ case -ENODEV:
+ /* device missing or wrong IDENTIFY data, schedule probing */
+ ehc->i.probe_mask |= (1 << dev->devno);
+ /* give it just one more chance */
+ ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
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 (ehc->tries[dev->devno] == 1) {
+ /* This is the last chance, better to slow
+ * down than lose it.
+ */
+ sata_down_spd_limit(ap);
+ ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
+ }
}
if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
ata_eh_finish(ap);
}
+#ifdef CONFIG_PM
/**
* ata_eh_handle_port_suspend - perform port suspend operation
* @ap: port to suspend
}
spin_unlock_irqrestore(ap->lock, flags);
}
+#endif /* CONFIG_PM */
projects / powerpc.git / blobdiff