diff mbox series

[2/3] scsi: hisi_sas: Block requests before a debugfs snapshot

Message ID 1689045300-44318-3-git-send-email-chenxiang66@hisilicon.com
State New
Headers show
Series Some misc changes | expand

Commit Message

chenxiang July 11, 2023, 3:14 a.m. UTC 
From: Yihang Li <liyihang9@huawei.com>

When FIO and debugfs snapshot occur concurrently, some SATA I/Os are failed
to return to the upper layer due to the setting of HISI_SAS_REJECT_CMD_BIT.
Then the SCSI layer invokes the error processing thread. However,
sas_ata_hard_reset() in EH also fails to be reset due to
the setting of HISI_SAS_REJECT_CMD_BIT. As a result, the device is
disabled.

Calling scsi_block_requests() in the front of a debugfs snapshot and wait
command complete before setting HISI_SAS_REJECT_CMD_BIT to avoid
SATA I/O failures.

Signed-off-by: Yihang Li <liyihang9@huawei.com>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
---
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 2f33e6b..7aad495 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -3106,21 +3106,25 @@  static const struct hisi_sas_debugfs_reg debugfs_ras_reg = {
 
 static void debugfs_snapshot_prepare_v3_hw(struct hisi_hba *hisi_hba)
 {
-	set_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
-
-	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0);
+	struct Scsi_Host *shost = hisi_hba->shost;
 
+	scsi_block_requests(shost);
 	wait_cmds_complete_timeout_v3_hw(hisi_hba, 100, 5000);
 
+	set_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
 	hisi_sas_sync_cqs(hisi_hba);
+	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0);
 }
 
 static void debugfs_snapshot_restore_v3_hw(struct hisi_hba *hisi_hba)
 {
+	struct Scsi_Host *shost = hisi_hba->shost;
+
 	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE,
 			 (u32)((1ULL << hisi_hba->queue_count) - 1));
 
 	clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
+	scsi_unblock_requests(shost);
 }
 
 static void read_iost_itct_cache_v3_hw(struct hisi_hba *hisi_hba,