[PATCH 2/6] scsi: libsas: Add sas_ata_link_abort()

[John Garry]

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.

Suggested-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
 drivers/scsi/libsas/sas_ata.c | 10 ++++++++++
 include/scsi/sas_ata.h        |  5 +++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index d35c9296f738..5a68197861bf 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -861,6 +861,16 @@ void sas_ata_wait_eh(struct domain_device *dev)
 	ata_port_wait_eh(ap);
 }
 
+void sas_ata_link_abort(struct domain_device *device)
+{
+	struct ata_port *ap = device->sata_dev.ap;
+	struct ata_link *link = &ap->link;
+
+	link->eh_info.err_mask |= AC_ERR_DEV;
+	ata_link_abort(link);
+}
+EXPORT_SYMBOL_GPL(sas_ata_link_abort);
+
 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
 {
 	struct sas_tmf_task tmf_task = {};
diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
index a1df4f9d57a3..e53aa21b590d 100644
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -32,6 +32,7 @@ void sas_probe_sata(struct asd_sas_port *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_link_abort(struct domain_device *dev);
 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis,
 			int force_phy_id);
 int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline);
@@ -87,6 +88,10 @@ static inline void sas_ata_end_eh(struct ata_port *ap)
 {
 }
 
+static inline void sas_ata_link_abort(struct domain_device *dev)
+{
+}
+
 static inline int sas_execute_ata_cmd(struct domain_device *device, u8 *fis,
 				      int force_phy_id)
 {
-- 
2.35.3