From: Bart Van Assche <bvanassche@acm.org>
Date: Wed, 21 Jul 2021 20:34:30 -0700
Subject: [PATCH] scsi: ufs: Remove several wmb() calls
Git-commit: 3d2ac73d13476fd996e3423863371805780a0663
a
Patch-mainline: v5.15-rc1
References: jsc#PED-818
From arch/arm/include/asm/io.h
#define __iowmb() wmb()
[ ... ]
#define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); })
From Documentation/memory-barriers.txt: "Note that, when using writel(), a
prior wmb() is not needed to guarantee that the cache coherent memory
writes have completed before writing to the MMIO region."
In other words, calling wmb() before writel() is not necessary. Hence
remove the wmb() calls that precede a writel() call. Remove the wmb() calls
that precede a ufshcd_send_command() call since the latter function uses
writel(). Remove the wmb() call from ufshcd_wait_for_dev_cmd() since the
following chain of events guarantees that the CPU will see up-to-date LRB
values:
- UFS controller writes to host memory.
- UFS controller posts completion interrupt after the memory writes from
the previous step are visible to the CPU.
- complete(hba->dev_cmd.complete) is called from the UFS interrupt handler.
- The wait_for_completion(hba->dev_cmd.complete) call in
ufshcd_wait_for_dev_cmd() returns.
Link: https://lore.kernel.org/r/20210722033439.26550-10-bvanassche@acm.org
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Stanley Chu <stanley.chu@mediatek.com>
Cc: Can Guo <cang@codeaurora.org>
Cc: Asutosh Das <asutoshd@codeaurora.org>
Cc: Avri Altman <avri.altman@wdc.com>
Tested-by: Avri altman <avri.altman@wdc.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/scsi/ufs/ufshcd.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 3ef2a2dda700..867678ea23ad 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2777,8 +2777,6 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
ufshcd_release(hba);
goto out;
}
- /* Make sure descriptors are ready before ringing the doorbell */
- wmb();
ufshcd_send_command(hba, tag);
out:
@@ -2888,8 +2886,6 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
msecs_to_jiffies(max_timeout));
- /* Make sure descriptors are ready before ringing the doorbell */
- wmb();
spin_lock_irqsave(hba->host->host_lock, flags);
hba->dev_cmd.complete = NULL;
if (likely(time_left)) {
@@ -2968,8 +2964,6 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
hba->dev_cmd.complete = &wait;
ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);
- /* Make sure descriptors are ready before ringing the doorbell */
- wmb();
ufshcd_send_command(hba, tag);
err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
@@ -6557,9 +6551,6 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
/* send command to the controller */
__set_bit(task_tag, &hba->outstanding_tasks);
- /* Make sure descriptors are ready before ringing the task doorbell */
- wmb();
-
ufshcd_writel(hba, 1 << task_tag, REG_UTP_TASK_REQ_DOOR_BELL);
/* Make sure that doorbell is committed immediately */
wmb();
@@ -6731,8 +6722,6 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
hba->dev_cmd.complete = &wait;
ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);
- /* Make sure descriptors are ready before ringing the doorbell */
- wmb();
ufshcd_send_command(hba, tag);
/*
--
2.35.3