X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fscsi%2Flibata-eh.c;h=70b623988a9f9f0ac8135a2e377e73220569cc0d;hb=47005f255ed126a4b48a1a2f63164fb1d83bcb0a;hp=a049bffdf7705e279429b37a58adff59920c58c4;hpb=0ea035a3d1ad948096e205f08f350c03d5cea453;p=linux-2.6

diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index a049bffdf7..70b623988a 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -46,6 +46,7 @@
 #include "libata.h"
 
 static void __ata_port_freeze(struct ata_port *ap);
+static void ata_eh_finish(struct ata_port *ap);
 
 static void ata_ering_record(struct ata_ering *ering, int is_io,
 			     unsigned int err_mask)
@@ -242,8 +243,11 @@ void ata_scsi_error(struct Scsi_Host *host)
 
 		spin_unlock_irqrestore(hs_lock, flags);
 
-		/* invoke EH */
-		ap->ops->error_handler(ap);
+		/* invoke EH.  if unloading, just finish failed qcs */
+		if (!(ap->flags & ATA_FLAG_UNLOADING))
+			ap->ops->error_handler(ap);
+		else
+			ata_eh_finish(ap);
 
 		/* Exception might have happend after ->error_handler
 		 * recovered the port but before this point.  Repeat
@@ -287,9 +291,16 @@ void ata_scsi_error(struct Scsi_Host *host)
 	/* clean up */
 	spin_lock_irqsave(hs_lock, flags);
 
-	if (ap->flags & ATA_FLAG_RECOVERED)
-		ata_port_printk(ap, KERN_INFO, "EH complete\n");
-	ap->flags &= ~ATA_FLAG_RECOVERED;
+	if (ap->flags & ATA_FLAG_LOADING) {
+		ap->flags &= ~ATA_FLAG_LOADING;
+	} else {
+		if (ap->flags & ATA_FLAG_SCSI_HOTPLUG)
+			queue_work(ata_aux_wq, &ap->hotplug_task);
+		if (ap->flags & ATA_FLAG_RECOVERED)
+			ata_port_printk(ap, KERN_INFO, "EH complete\n");
+	}
+
+	ap->flags &= ~(ATA_FLAG_SCSI_HOTPLUG | ATA_FLAG_RECOVERED);
 
 	/* tell wait_eh that we're done */
 	ap->flags &= ~ATA_FLAG_EH_IN_PROGRESS;
@@ -323,6 +334,7 @@ void ata_port_wait_eh(struct ata_port *ap)
 		schedule();
 		spin_lock_irqsave(&ap->host_set->lock, flags);
 	}
+	finish_wait(&ap->eh_wait_q, &wait);
 
 	spin_unlock_irqrestore(&ap->host_set->lock, flags);
 
@@ -694,9 +706,35 @@ static void ata_eh_detach_dev(struct ata_device *dev)
 	spin_unlock_irqrestore(&ap->host_set->lock, flags);
 }
 
+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_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
@@ -706,16 +744,35 @@ static void ata_eh_detach_dev(struct ata_device *dev)
  *	LOCKING:
  *	None.
  */
-static void ata_eh_about_to_do(struct ata_port *ap, unsigned int action)
+static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
+			       unsigned int action)
 {
 	unsigned long flags;
 
 	spin_lock_irqsave(&ap->host_set->lock, flags);
-	ap->eh_info.action &= ~action;
+	ata_eh_clear_action(dev, &ap->eh_info, action);
 	ap->flags |= ATA_FLAG_RECOVERED;
 	spin_unlock_irqrestore(&ap->host_set->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)
+{
+	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
@@ -932,10 +989,8 @@ static void ata_eh_analyze_serror(struct ata_port *ap)
 		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;
-	}
+	if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG))
+		ata_ehi_hotplugged(&ehc->i);
 
 	ehc->i.err_mask |= err_mask;
 	ehc->i.action |= action;
@@ -1261,10 +1316,6 @@ static void ata_eh_autopsy(struct ata_port *ap)
 			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);
-
 	/* enforce default EH actions */
 	if (ap->flags & ATA_FLAG_FROZEN ||
 	    all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
@@ -1272,6 +1323,17 @@ static void ata_eh_autopsy(struct ata_port *ap)
 	else if (all_err_mask)
 		action |= ATA_EH_REVALIDATE;
 
+	/* if we have offending qcs and the associated failed device */
+	if (failed_dev) {
+		/* speed down */
+		action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask);
+
+		/* perform per-dev EH action only on the offending device */
+		ehc->i.dev_action[failed_dev->devno] |=
+			action & ATA_EH_PERDEV_MASK;
+		action &= ~ATA_EH_PERDEV_MASK;
+	}
+
 	/* record autopsy result */
 	ehc->i.dev = failed_dev;
 	ehc->i.action = action;
@@ -1346,6 +1408,34 @@ static void ata_eh_report(struct ata_port *ap)
 	}
 }
 
+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)
 {
@@ -1365,6 +1455,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
 	struct ata_eh_context *ehc = &ap->eh_context;
 	unsigned int *classes = ehc->classes;
 	int tries = ATA_EH_RESET_TRIES;
+	int verbose = !(ap->flags & ATA_FLAG_LOADING);
 	unsigned int action;
 	ata_reset_fn_t reset;
 	int i, did_followup_srst, rc;
@@ -1412,11 +1503,13 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
 	}
 
  retry:
-	ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
-			reset == softreset ? "soft" : "hard");
+	/* shut up during boot probing */
+	if (verbose)
+		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);
+	ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
 	ehc->i.flags |= ATA_EHI_DID_RESET;
 
 	rc = ata_do_reset(ap, reset, classes);
@@ -1435,7 +1528,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
 			return -EINVAL;
 		}
 
-		ata_eh_about_to_do(ap, ATA_EH_RESET_MASK);
+		ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
 		rc = ata_do_reset(ap, reset, classes);
 
 		if (rc == 0 && classify &&
@@ -1479,40 +1572,62 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
 			postreset(ap, classes);
 
 		/* reset successful, schedule revalidation */
-		ehc->i.dev = NULL;
-		ehc->i.action &= ~ATA_EH_RESET_MASK;
+		ata_eh_done(ap, NULL, 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)
+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;
+
 		dev = &ap->device[i];
+		action = ehc->i.action | ehc->i.dev_action[dev->devno];
 
-		if (ehc->i.action & ATA_EH_REVALIDATE && ata_dev_enabled(dev) &&
-		    (!ehc->i.dev || ehc->i.dev == dev)) {
+		if (action & ATA_EH_REVALIDATE && ata_dev_enabled(dev)) {
 			if (ata_port_offline(ap)) {
 				rc = -EIO;
 				break;
 			}
 
-			ata_eh_about_to_do(ap, ATA_EH_REVALIDATE);
+			ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
 			rc = ata_dev_revalidate(dev,
 					ehc->i.flags & ATA_EHI_DID_RESET);
 			if (rc)
 				break;
 
-			ehc->i.action &= ~ATA_EH_REVALIDATE;
+			ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
+
+			/* 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, 1, dev->id);
+			if (rc == 0)
+				rc = ata_dev_configure(dev, 1);
+
+			if (rc) {
+				dev->class = ATA_DEV_UNKNOWN;
+				break;
+			}
+
+			spin_lock_irqsave(&ap->host_set->lock, flags);
+			ap->flags |= ATA_FLAG_SCSI_HOTPLUG;
+			spin_unlock_irqrestore(&ap->host_set->lock, flags);
 		}
 	}
 
@@ -1533,6 +1648,36 @@ static int ata_port_nr_enabled(struct ata_port *ap)
 	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;
+
+	if (ap->flags & ATA_FLAG_FROZEN || 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
@@ -1543,9 +1688,10 @@ static int ata_port_nr_enabled(struct ata_port *ap)
  *
  *	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.
+ *	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).
@@ -1568,22 +1714,42 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
 		dev = &ap->device[i];
 
 		ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+
+		/* 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->flags & ATA_FLAG_UNLOADING)
+		goto out;
+
 	/* skip EH if possible. */
-	if (!ata_port_nr_enabled(ap) && !(ap->flags & ATA_FLAG_FROZEN))
+	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, 0, prereset, softreset, hardreset,
-				  postreset);
+		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");
@@ -1593,8 +1759,8 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
 		ata_eh_thaw_port(ap);
 	}
 
-	/* revalidate existing devices */
-	rc = ata_eh_revalidate(ap, &dev);
+	/* revalidate existing devices and attach new ones */
+	rc = ata_eh_revalidate_and_attach(ap, &dev);
 	if (rc)
 		goto dev_fail;
 
@@ -1612,6 +1778,8 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
  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;
@@ -1624,15 +1792,31 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
 			ehc->tries[dev->devno] = 0;
 	}
 
-	/* disable device if it has used up all its chances */
-	if (ata_dev_enabled(dev) && !ehc->tries[dev->devno])
+	if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
+		/* disable device if it has used up all its chances */
 		ata_dev_disable(dev);
 
-	/* 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;
+		/* 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 "
@@ -1714,8 +1898,11 @@ 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);
+	if (!(ap->flags & ATA_FLAG_LOADING)) {
+		ata_eh_autopsy(ap);
+		ata_eh_report(ap);
+	}
+
 	ata_eh_recover(ap, prereset, softreset, hardreset, postreset);
 	ata_eh_finish(ap);
 }