[PATCH v3 1/7] scsi: libsas: Add sas_task_find_rq()

John Garry
2022-10-04T10:56:51Z

blk-mq already provides a unique tag per request. Some libsas LLDDs - like
hisi_sas - already use this tag as the unique per-IO HW tag.

Add a common function to provide the request associated with a sas_task
for all libsas LLDDs.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
include/scsi/libsas.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index f86b56bf7833..f498217961db 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -644,6 +644,24 @@ static inline bool sas_is_internal_abort(struct sas_task *task)
return task->task_proto == SAS_PROTOCOL_INTERNAL_ABORT;
}

+static inline struct request *sas_task_find_rq(struct sas_task *task)
+{
+ struct scsi_cmnd *scmd;
+
+ if (task->task_proto & SAS_PROTOCOL_STP_ALL) {
+ struct ata_queued_cmd *qc = task->uldd_task;
+
+ scmd = qc ? qc->scsicmd : NULL;
+ } else {
+ scmd = task->uldd_task;
+ }
+
+ if (!scmd)
+ return NULL;
+
+ return scsi_cmd_to_rq(scmd);
+}
+
struct sas_domain_function_template {
/* The class calls these to notify the LLDD of an event. */
void (*lldd_port_formed)(struct asd_sas_phy *);
--
2.25.1