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Petersen" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Bart Van Assche , Avri Altman Subject: [PATCH v2 1/3] scsi: ufs: core: Remove redundant host_lock calls around UTMRLDBR. Date: Tue, 22 Oct 2024 10:43:17 +0300 Message-Id: <20241022074319.512127-2-avri.altman@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241022074319.512127-1-avri.altman@wdc.com> References: <20241022074319.512127-1-avri.altman@wdc.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There is no need to serialize single read/write calls to the host controller registers. Remove the redundant host_lock calls that protect access to the task management doorbell register: UTMRLDBR. Signed-off-by: Avri Altman --- drivers/ufs/core/ufshcd.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 9e6d008f4ea4..29f1cd3375bd 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -1245,11 +1245,13 @@ static bool ufshcd_is_devfreq_scaling_required(struct ufs_hba *hba, static u32 ufshcd_pending_cmds(struct ufs_hba *hba) { const struct scsi_device *sdev; + unsigned long flags; u32 pending = 0; - lockdep_assert_held(hba->host->host_lock); + spin_lock_irqsave(hba->host->host_lock, flags); __shost_for_each_device(sdev, hba->host) pending += sbitmap_weight(&sdev->budget_map); + spin_unlock_irqrestore(hba->host->host_lock, flags); return pending; } @@ -1263,7 +1265,6 @@ static u32 ufshcd_pending_cmds(struct ufs_hba *hba) static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, u64 wait_timeout_us) { - unsigned long flags; int ret = 0; u32 tm_doorbell; u32 tr_pending; @@ -1271,7 +1272,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, ktime_t start; ufshcd_hold(hba); - spin_lock_irqsave(hba->host->host_lock, flags); /* * Wait for all the outstanding tasks/transfer requests. * Verify by checking the doorbell registers are clear. @@ -1292,7 +1292,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, break; } - spin_unlock_irqrestore(hba->host->host_lock, flags); io_schedule_timeout(msecs_to_jiffies(20)); if (ktime_to_us(ktime_sub(ktime_get(), start)) > wait_timeout_us) { @@ -1304,7 +1303,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, */ do_last_check = true; } - spin_lock_irqsave(hba->host->host_lock, flags); } while (tm_doorbell || tr_pending); if (timeout) { @@ -1314,7 +1312,6 @@ static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, ret = -EBUSY; } out: - spin_unlock_irqrestore(hba->host->host_lock, flags); ufshcd_release(hba); return ret; } @@ -6877,13 +6874,13 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba, u32 intr_status) */ static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba) { - unsigned long flags, pending, issued; + unsigned long flags; + unsigned long pending = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL); + unsigned long issued = hba->outstanding_tasks & ~pending; irqreturn_t ret = IRQ_NONE; int tag; spin_lock_irqsave(hba->host->host_lock, flags); - pending = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL); - issued = hba->outstanding_tasks & ~pending; for_each_set_bit(tag, &issued, hba->nutmrs) { struct request *req = hba->tmf_rqs[tag]; struct completion *c = req->end_io_data; @@ -7065,12 +7062,13 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba, memcpy(hba->utmrdl_base_addr + task_tag, treq, sizeof(*treq)); ufshcd_vops_setup_task_mgmt(hba, task_tag, tm_function); - /* send command to the controller */ __set_bit(task_tag, &hba->outstanding_tasks); - ufshcd_writel(hba, 1 << task_tag, REG_UTP_TASK_REQ_DOOR_BELL); spin_unlock_irqrestore(host->host_lock, flags); + /* send command to the controller */ + ufshcd_writel(hba, 1 << task_tag, REG_UTP_TASK_REQ_DOOR_BELL); + ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_SEND); /* wait until the task management command is completed */