libata: make reset related methods proper port operations

Currently reset methods are not specified directly in the
ata_port_operations table.  If a LLD wants to use custom reset
methods, it should construct and use a error_handler which uses those
reset methods.  It's done this way for two reasons.

First, the ops table already contained too many methods and adding
four more of them would noticeably increase the amount of necessary
boilerplate code all over low level drivers.

Second, as ->error_handler uses those reset methods, it can get
confusing.  ie. By overriding ->error_handler, those reset ops can be
made useless making layering a bit hazy.

Now that ops table uses inheritance, the first problem doesn't exist
anymore.  The second isn't completely solved but is relieved by
providing default values - most drivers can just override what it has
implemented and don't have to concern itself about higher level
callbacks.  In fact, there currently is no driver which actually
modifies error handling behavior.  Drivers which override
->error_handler just wraps the standard error handler only to prepare
the controller for EH.  I don't think making ops layering strict has
any noticeable benefit.

This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and
their PMP counterparts propoer ops.  Default ops are provided in the
base ops tables and drivers are converted to override individual reset
methods instead of creating custom error_handler.

* ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs
  aren't accessible.  sata_promise doesn't need to use separate
  error_handlers for PATA and SATA anymore.

* softreset is broken for sata_inic162x and sata_sx4.  As libata now
  always prefers hardreset, this doesn't really matter but the ops are
  forced to NULL using ATA_OP_NULL for documentation purpose.

* pata_hpt374 needs to use different prereset for the first and second
  PCI functions.  This used to be done by branching from
  hpt374_error_handler().  The proper way to do this is to use
  separate ops and port_info tables for each function.  Converted.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 18 insertions, 35 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index dacb3ef..3efa990 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -252,9 +252,18 @@ static void ahci_freeze(struct ata_port *ap);
 static void ahci_thaw(struct ata_port *ap);
 static void ahci_pmp_attach(struct ata_port *ap);
 static void ahci_pmp_detach(struct ata_port *ap);
+static int ahci_softreset(struct ata_link *link, unsigned int *class,
+			  unsigned long deadline);
+static int ahci_hardreset(struct ata_link *link, unsigned int *class,
+			  unsigned long deadline);
+static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
+				 unsigned long deadline);
+static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
+				unsigned long deadline);
+static void ahci_postreset(struct ata_link *link, unsigned int *class);
+static int ahci_pmp_softreset(struct ata_link *link, unsigned int *class,
+			      unsigned long deadline);
 static void ahci_error_handler(struct ata_port *ap);
-static void ahci_vt8251_error_handler(struct ata_port *ap);
-static void ahci_p5wdh_error_handler(struct ata_port *ap);
 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
 static int ahci_port_resume(struct ata_port *ap);
 static void ahci_dev_config(struct ata_device *dev);
@@ -293,6 +302,10 @@ static struct ata_port_operations ahci_ops = {
 
 	.freeze			= ahci_freeze,
 	.thaw			= ahci_thaw,
+	.softreset		= ahci_softreset,
+	.hardreset		= ahci_hardreset,
+	.postreset		= ahci_postreset,
+	.pmp_softreset		= ahci_pmp_softreset,
 	.error_handler		= ahci_error_handler,
 	.post_internal_cmd	= ahci_post_internal_cmd,
 	.dev_config		= ahci_dev_config,
@@ -314,12 +327,12 @@ static struct ata_port_operations ahci_ops = {
 
 static struct ata_port_operations ahci_vt8251_ops = {
 	.inherits		= &ahci_ops,
-	.error_handler		= ahci_vt8251_error_handler,
+	.hardreset		= ahci_vt8251_hardreset,
 };
 
 static struct ata_port_operations ahci_p5wdh_ops = {
 	.inherits		= &ahci_ops,
-	.error_handler		= ahci_p5wdh_error_handler,
+	.hardreset		= ahci_p5wdh_hardreset,
 };
 
 #define AHCI_HFLAGS(flags)	.private_data	= (void *)(flags)
@@ -1796,37 +1809,7 @@ static void ahci_error_handler(struct ata_port *ap)
 		ahci_start_engine(ap);
 	}
 
-	/* perform recovery */
-	sata_pmp_do_eh(ap, ata_std_prereset, ahci_softreset,
-		       ahci_hardreset, ahci_postreset,
-		       sata_pmp_std_prereset, ahci_pmp_softreset,
-		       sata_pmp_std_hardreset, sata_pmp_std_postreset);
-}
-
-static void ahci_vt8251_error_handler(struct ata_port *ap)
-{
-	if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
-		/* restart engine */
-		ahci_stop_engine(ap);
-		ahci_start_engine(ap);
-	}
-
-	/* perform recovery */
-	ata_do_eh(ap, ata_std_prereset, ahci_softreset, ahci_vt8251_hardreset,
-		  ahci_postreset);
-}
-
-static void ahci_p5wdh_error_handler(struct ata_port *ap)
-{
-	if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
-		/* restart engine */
-		ahci_stop_engine(ap);
-		ahci_start_engine(ap);
-	}
-
-	/* perform recovery */
-	ata_do_eh(ap, ata_std_prereset, ahci_softreset, ahci_p5wdh_hardreset,
-		  ahci_postreset);
+	sata_pmp_error_handler(ap);
 }
 
 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)