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scsi: ufs: Remove several wmb() calls 

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>
This commit is contained in:
Bart Van Assche 2021-07-21 20:34:30 -07:00 коммит произвёл Martin K. Petersen
Родитель 9c202090ed
Коммит 3d2ac73d13
1 изменённых файлов: 0 добавлений и 11 удалений
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11
drivers/scsi/ufs/ufshcd.c
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@ -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);
/*