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[122.107.196.14]) by smtp.gmail.com with ESMTPSA id x9-20020a170902ec8900b0016c3affe60esm8498377plg.46.2022.07.31.21.30.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 31 Jul 2022 21:30:30 -0700 (PDT) From: Daniil Lunev To: Adrian Hunter , Bart Van Assche , Stanley Chu Cc: Daniil Lunev , Alim Akhtar , Avri Altman , Bean Huo , Daejun Park , "James E.J. Bottomley" , "Martin K. Petersen" , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org Subject: [PATCH v2] ufs: core: ufshcd: use local_clock() for debugging timestamps Date: Mon, 1 Aug 2022 14:30:21 +1000 Message-Id: <20220801142931.v2.1.I699244ea7efbd326a34a6dfd9b5a31e78400cf68@changeid> X-Mailer: git-send-email 2.31.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org CLOCK_MONOTONIC is not advanced when the system is in suspend. This becomes problematic when debugging issues related to suspend-resume: the timestamps printed by ufshcd_print_trs can not be correlated with dmesg entries, which are timestamped with local_clock(). This patch changes the used clock to local_clock() for the informational timestamp variables and adds mirroring *_local_clock instances for variables used in subsequent derevations (to not change the semantics of those derevations). Signed-off-by: Daniil Lunev --- Changes in v2: - Use local clock to better align with dmesg - Correct commit message drivers/ufs/core/ufshcd.c | 19 +++++++++++-------- include/ufs/ufshcd.h | 14 +++++++++----- 2 files changed, 20 insertions(+), 13 deletions(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index ce86d1b790c05..86875a626ea77 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -460,7 +460,7 @@ static void ufshcd_print_evt(struct ufs_hba *hba, u32 id, if (e->tstamp[p] == 0) continue; dev_err(hba->dev, "%s[%d] = 0x%x at %lld us\n", err_name, p, - e->val[p], ktime_to_us(e->tstamp[p])); + e->val[p], e->tstamp[p] / 1000); found = true; } @@ -505,9 +505,9 @@ void ufshcd_print_trs(struct ufs_hba *hba, unsigned long bitmap, bool pr_prdt) lrbp = &hba->lrb[tag]; dev_err(hba->dev, "UPIU[%d] - issue time %lld us\n", - tag, ktime_to_us(lrbp->issue_time_stamp)); + tag, lrbp->issue_time_stamp_local_clock / 1000); dev_err(hba->dev, "UPIU[%d] - complete time %lld us\n", - tag, ktime_to_us(lrbp->compl_time_stamp)); + tag, lrbp->compl_time_stamp_local_clock / 1000); dev_err(hba->dev, "UPIU[%d] - Transfer Request Descriptor phys@0x%llx\n", tag, (u64)lrbp->utrd_dma_addr); @@ -569,10 +569,10 @@ static void ufshcd_print_host_state(struct ufs_hba *hba) dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state); dev_err(hba->dev, "last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt=%d\n", - ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp), + hba->ufs_stats.last_hibern8_exit_tstamp / 1000, hba->ufs_stats.hibern8_exit_cnt); dev_err(hba->dev, "last intr at %lld us, last intr status=0x%x\n", - ktime_to_us(hba->ufs_stats.last_intr_ts), + hba->ufs_stats.last_intr_ts / 1000, hba->ufs_stats.last_intr_status); dev_err(hba->dev, "error handling flags=0x%x, req. abort count=%d\n", hba->eh_flags, hba->req_abort_count); @@ -2142,7 +2142,9 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag) unsigned long flags; lrbp->issue_time_stamp = ktime_get(); + lrbp->issue_time_stamp_local_clock = local_clock(); lrbp->compl_time_stamp = ktime_set(0, 0); + lrbp->compl_time_stamp_local_clock = 0; ufshcd_add_command_trace(hba, task_tag, UFS_CMD_SEND); ufshcd_clk_scaling_start_busy(hba); if (unlikely(ufshcd_should_inform_monitor(hba, lrbp))) @@ -4199,7 +4201,7 @@ int ufshcd_uic_hibern8_exit(struct ufs_hba *hba) } else { ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT, POST_CHANGE); - hba->ufs_stats.last_hibern8_exit_tstamp = ktime_get(); + hba->ufs_stats.last_hibern8_exit_tstamp = local_clock(); hba->ufs_stats.hibern8_exit_cnt++; } @@ -4696,7 +4698,7 @@ void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val) e = &hba->ufs_stats.event[id]; e->val[e->pos] = val; - e->tstamp[e->pos] = ktime_get(); + e->tstamp[e->pos] = local_clock(); e->cnt += 1; e->pos = (e->pos + 1) % UFS_EVENT_HIST_LENGTH; @@ -5329,6 +5331,7 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba, for_each_set_bit(index, &completed_reqs, hba->nutrs) { lrbp = &hba->lrb[index]; lrbp->compl_time_stamp = ktime_get(); + lrbp->compl_time_stamp_local_clock = local_clock(); cmd = lrbp->cmd; if (cmd) { if (unlikely(ufshcd_should_inform_monitor(hba, lrbp))) @@ -6617,7 +6620,7 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba) intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); hba->ufs_stats.last_intr_status = intr_status; - hba->ufs_stats.last_intr_ts = ktime_get(); + hba->ufs_stats.last_intr_ts = local_clock(); /* * There could be max of hba->nutrs reqs in flight and in worst case diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index a92271421718e..2de73196bb779 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -160,8 +160,10 @@ struct ufs_pm_lvl_states { * @task_tag: Task tag of the command * @lun: LUN of the command * @intr_cmd: Interrupt command (doesn't participate in interrupt aggregation) - * @issue_time_stamp: time stamp for debug purposes - * @compl_time_stamp: time stamp for statistics + * @issue_time_stamp: time stamp for debug purposes (CLOCK_MONOTONIC) + * @issue_time_stamp_local_clock: time stamp for debug purposes (local_clock) + * @compl_time_stamp: time stamp for statistics (CLOCK_MONOTONIC) + * @compl_time_stamp_local_clock: time stamp for debug purposes (local_clock) * @crypto_key_slot: the key slot to use for inline crypto (-1 if none) * @data_unit_num: the data unit number for the first block for inline crypto * @req_abort_skip: skip request abort task flag @@ -185,7 +187,9 @@ struct ufshcd_lrb { u8 lun; /* UPIU LUN id field is only 8-bit wide */ bool intr_cmd; ktime_t issue_time_stamp; + u64 issue_time_stamp_local_clock; ktime_t compl_time_stamp; + u64 compl_time_stamp_local_clock; #ifdef CONFIG_SCSI_UFS_CRYPTO int crypto_key_slot; u64 data_unit_num; @@ -430,7 +434,7 @@ struct ufs_clk_scaling { struct ufs_event_hist { int pos; u32 val[UFS_EVENT_HIST_LENGTH]; - ktime_t tstamp[UFS_EVENT_HIST_LENGTH]; + u64 tstamp[UFS_EVENT_HIST_LENGTH]; unsigned long long cnt; }; @@ -446,10 +450,10 @@ struct ufs_event_hist { */ struct ufs_stats { u32 last_intr_status; - ktime_t last_intr_ts; + u64 last_intr_ts; u32 hibern8_exit_cnt; - ktime_t last_hibern8_exit_tstamp; + u64 last_hibern8_exit_tstamp; struct ufs_event_hist event[UFS_EVT_CNT]; };