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scsi: ufs: core: Make the reserved slot a reserved request

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Instead of letting the SCSI core allocate hba->nutrs - 1 commands, let
the SCSI core allocate hba->nutrs commands, set the number of reserved
tags to 1 and use the reserved tag for device management commands. This
patch changes the 'reserved slot' from hba->nutrs - 1 into 0 because the
block layer reserves the smallest tags for reserved commands.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20251031204029.2883185-22-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche
2025-10-31 13:39:29 -07:00
committed by Martin K. Petersen
parent d3fd0fd776
commit 1d0af94ffb
1 changed files with 2 additions and 2 deletions
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4
drivers/ufs/core/ufshcd.c
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@@ -2476,7 +2476,7 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS_SDB) + 1;
hba->nutmrs =
((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
hba->reserved_slot = hba->nutrs - 1;
hba->reserved_slot = 0;
hba->nortt = FIELD_GET(MASK_NUMBER_OUTSTANDING_RTT, hba->capabilities) + 1;
@@ -8945,7 +8945,6 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
goto err;
hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
return 0;
err:
@@ -9184,6 +9183,7 @@ static const struct scsi_host_template ufshcd_driver_template = {
.proc_name = UFSHCD,
.map_queues = ufshcd_map_queues,
.queuecommand = ufshcd_queuecommand,
.nr_reserved_cmds = UFSHCD_NUM_RESERVED,
.mq_poll = ufshcd_poll,
.sdev_init = ufshcd_sdev_init,
.sdev_configure = ufshcd_sdev_configure,