From: John Garry <john.garry@huawei.com>
Date: Mon, 17 Oct 2022 17:20:28 +0800
Subject: scsi: libsas: Add sas_ata_device_link_abort()
Git-commit: 44112922674b94a7d699dfff6307fc830018df7c
Patch-mainline: v6.2-rc1
References: git-fixes

Similar to how AHCI handles NCQ errors in ahci_error_intr() ->
ata_port_abort() -> ata_do_link_abort(), add an NCQ error handler for LLDDs
to call to initiate a link abort.

This will mark all outstanding QCs as failed and kick-off EH.

Note:

A "force reset" argument is added for drivers which require the ATA error
handling to always reset the device.

A driver may require this feature for when SATA device per-SCSI cmnd
resources are only released during reset for ATA EH. As such, we need an
option to force reset to be done, regardless of what any EH autopsy
decides.

The SATA device FIS fields are set to indicate a device error from
ata_eh_analyze_tf().

[lduncan: applied by hand since some context was missing]
[mkoutny: refreshed]

Suggested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Suggested-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1665998435-199946-2-git-send-email-john.garry@huawei.com
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Niklas Cassel <niklas.cassel@wdc.com> # pm80xx
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
 drivers/scsi/libsas/sas_ata.c |   15 +++++++++++++++
 include/scsi/sas_ata.h        |    6 ++++++
 2 files changed, 21 insertions(+)

--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -856,6 +856,21 @@ void sas_ata_wait_eh(struct domain_devic
 	ap = dev->sata_dev.ap;
 	ata_port_wait_eh(ap);
 }
+ 
+void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
+{
+	struct ata_port *ap = device->sata_dev.ap;
+	struct ata_link *link = &ap->link;
+
+	device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
+	device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
+
+	link->eh_info.err_mask |= AC_ERR_DEV;
+	if (force_reset)
+		link->eh_info.action |= ATA_EH_RESET;
+	ata_link_abort(link);
+}
+EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
 
 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
 {
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -33,6 +33,7 @@ void sas_probe_sata(struct asd_sas_port
 void sas_suspend_sata(struct asd_sas_port *port);
 void sas_resume_sata(struct asd_sas_port *port);
 void sas_ata_end_eh(struct ata_port *ap);
+void sas_ata_device_link_abort(struct domain_device *dev, bool force_reset);
 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis,
 			int force_phy_id);
 #else
@@ -88,6 +89,11 @@ static inline void sas_ata_end_eh(struct
 {
 }
 
+static inline void sas_ata_device_link_abort(struct domain_device *dev,
+					     bool force_reset)
+{
+}
+
 static inline int sas_execute_ata_cmd(struct domain_device *device, u8 *fis,
 				      int force_phy_id)
 {