3 files changed, 135 insertions, 4 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index c5c3b1b516e1..9bef1a84fe3f 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -144,7 +144,7 @@ static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CF
 module_param_named(dma, libata_dma_mask, int, 0444);
 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
 
-static int ata_probe_timeout = ATA_TMOUT_INTERNAL / 1000;
+static int ata_probe_timeout;
 module_param(ata_probe_timeout, int, 0444);
 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
 
@@ -1611,6 +1611,7 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
 	struct ata_link *link = dev->link;
 	struct ata_port *ap = link->ap;
 	u8 command = tf->command;
+	int auto_timeout = 0;
 	struct ata_queued_cmd *qc;
 	unsigned int tag, preempted_tag;
 	u32 preempted_sactive, preempted_qc_active;
@@ -1683,8 +1684,14 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
 
 	spin_unlock_irqrestore(ap->lock, flags);
 
-	if (!timeout)
-		timeout = ata_probe_timeout * 1000;
+	if (!timeout) {
+		if (ata_probe_timeout)
+			timeout = ata_probe_timeout * 1000;
+		else {
+			timeout = ata_internal_cmd_timeout(dev, command);
+			auto_timeout = 1;
+		}
+	}
 
 	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
 
@@ -1760,6 +1767,9 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
 
 	spin_unlock_irqrestore(ap->lock, flags);
 
+	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
+		ata_internal_cmd_timed_out(dev, command);
+
 	return err_mask;
 }
 
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 83d1451fa714..d5f03a6e3334 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -67,6 +67,8 @@ enum {
 	ATA_ECAT_DUBIOUS_UNK_DEV	= 7,
 	ATA_ECAT_NR			= 8,
 
+	ATA_EH_CMD_DFL_TIMEOUT		=  5000,
+
 	/* always put at least this amount of time between resets */
 	ATA_EH_RESET_COOL_DOWN		=  5000,
 
@@ -93,6 +95,53 @@ static const unsigned long ata_eh_reset_timeouts[] = {
 	ULONG_MAX, /* > 1 min has elapsed, give up */
 };
 
+static const unsigned long ata_eh_identify_timeouts[] = {
+	 5000,	/* covers > 99% of successes and not too boring on failures */
+	10000,  /* combined time till here is enough even for media access */
+	30000,	/* for true idiots */
+	ULONG_MAX,
+};
+
+static const unsigned long ata_eh_other_timeouts[] = {
+	 5000,	/* same rationale as identify timeout */
+	10000,	/* ditto */
+	/* but no merciful 30sec for other commands, it just isn't worth it */
+	ULONG_MAX,
+};
+
+struct ata_eh_cmd_timeout_ent {
+	const u8		*commands;
+	const unsigned long	*timeouts;
+};
+
+/* The following table determines timeouts to use for EH internal
+ * commands.  Each table entry is a command class and matches the
+ * commands the entry applies to and the timeout table to use.
+ *
+ * On the retry after a command timed out, the next timeout value from
+ * the table is used.  If the table doesn't contain further entries,
+ * the last value is used.
+ *
+ * ehc->cmd_timeout_idx keeps track of which timeout to use per
+ * command class, so if SET_FEATURES times out on the first try, the
+ * next try will use the second timeout value only for that class.
+ */
+#define CMDS(cmds...)	(const u8 []){ cmds, 0 }
+static const struct ata_eh_cmd_timeout_ent
+ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
+	{ .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
+	  .timeouts = ata_eh_identify_timeouts, },
+	{ .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
+	  .timeouts = ata_eh_other_timeouts, },
+	{ .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
+	  .timeouts = ata_eh_other_timeouts, },
+	{ .commands = CMDS(ATA_CMD_SET_FEATURES),
+	  .timeouts = ata_eh_other_timeouts, },
+	{ .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
+	  .timeouts = ata_eh_other_timeouts, },
+};
+#undef CMDS
+
 static void __ata_port_freeze(struct ata_port *ap);
 #ifdef CONFIG_PM
 static void ata_eh_handle_port_suspend(struct ata_port *ap);
@@ -238,6 +287,73 @@ void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
 
 #endif /* CONFIG_PCI */
 
+static int ata_lookup_timeout_table(u8 cmd)
+{
+	int i;
+
+	for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
+		const u8 *cur;
+
+		for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
+			if (*cur == cmd)
+				return i;
+	}
+
+	return -1;
+}
+
+/**
+ *	ata_internal_cmd_timeout - determine timeout for an internal command
+ *	@dev: target device
+ *	@cmd: internal command to be issued
+ *
+ *	Determine timeout for internal command @cmd for @dev.
+ *
+ *	LOCKING:
+ *	EH context.
+ *
+ *	RETURNS:
+ *	Determined timeout.
+ */
+unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
+{
+	struct ata_eh_context *ehc = &dev->link->eh_context;
+	int ent = ata_lookup_timeout_table(cmd);
+	int idx;
+
+	if (ent < 0)
+		return ATA_EH_CMD_DFL_TIMEOUT;
+
+	idx = ehc->cmd_timeout_idx[dev->devno][ent];
+	return ata_eh_cmd_timeout_table[ent].timeouts[idx];
+}
+
+/**
+ *	ata_internal_cmd_timed_out - notification for internal command timeout
+ *	@dev: target device
+ *	@cmd: internal command which timed out
+ *
+ *	Notify EH that internal command @cmd for @dev timed out.  This
+ *	function should be called only for commands whose timeouts are
+ *	determined using ata_internal_cmd_timeout().
+ *
+ *	LOCKING:
+ *	EH context.
+ */
+void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
+{
+	struct ata_eh_context *ehc = &dev->link->eh_context;
+	int ent = ata_lookup_timeout_table(cmd);
+	int idx;
+
+	if (ent < 0)
+		return;
+
+	idx = ehc->cmd_timeout_idx[dev->devno][ent];
+	if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != ULONG_MAX)
+		ehc->cmd_timeout_idx[dev->devno][ent]++;
+}
+
 static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
 			     unsigned int err_mask)
 {
@@ -2600,8 +2716,11 @@ static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
 			ata_eh_detach_dev(dev);
 
 		/* schedule probe if necessary */
-		if (ata_eh_schedule_probe(dev))
+		if (ata_eh_schedule_probe(dev)) {
 			ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+			memset(ehc->cmd_timeout_idx[dev->devno], 0,
+			       sizeof(ehc->cmd_timeout_idx[dev->devno]));
+		}
 
 		return 1;
 	} else {
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 1cf803adbc95..f6f9c28ec7f8 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -151,6 +151,8 @@ extern void ata_scsi_dev_rescan(struct work_struct *work);
 extern int ata_bus_probe(struct ata_port *ap);
 
 /* libata-eh.c */
+extern unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd);
+extern void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd);
 extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
 extern void ata_scsi_error(struct Scsi_Host *host);
 extern void ata_port_wait_eh(struct ata_port *ap);