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authorStanley Chu <stanley.chu@mediatek.com>2019-07-10 15:38:21 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2019-07-22 22:44:06 +0200
commit8808b4e9dcdc908e1d48b1809416c5f80af9c87e (patch)
treee3d895928b00c6399d6e2dda4fa21d42013dd197 /drivers/scsi/ufs
parentscsi: ufs: Do not reset error history during host reset (diff)
downloadlinux-8808b4e9dcdc908e1d48b1809416c5f80af9c87e.tar.xz
linux-8808b4e9dcdc908e1d48b1809416c5f80af9c87e.zip
scsi: ufs: Add history of fatal events
Currently only "interrupt-based" errors have their own history, however there are some "non-interrupt-based" errors or events which need history to improve debugging or help know the health status of UFS devices. Example of fatal errors: - Link startup error - Suspend error - Resume error Example of abnormal events: - Task or request abort - Device reset (now equals to Logical Unit Reset) - Host reset This patch tries to track above errors and events by existed UFS error history mechanism. Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> Reviewed-by: Avri Altman <avri.altman@wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs')
-rw-r--r--drivers/scsi/ufs/ufshcd.c46
-rw-r--r--drivers/scsi/ufs/ufshcd.h18
2 files changed, 50 insertions, 14 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index f272ec3cad58..3804a704e565 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -429,9 +429,17 @@ static void ufshcd_print_host_regs(struct ufs_hba *hba)
ufshcd_print_err_hist(hba, &hba->ufs_stats.nl_err, "nl_err");
ufshcd_print_err_hist(hba, &hba->ufs_stats.tl_err, "tl_err");
ufshcd_print_err_hist(hba, &hba->ufs_stats.dme_err, "dme_err");
- ufshcd_print_err_hist(hba, &hba->ufs_stats.fatal_err, "fatal_err");
ufshcd_print_err_hist(hba, &hba->ufs_stats.auto_hibern8_err,
"auto_hibern8_err");
+ ufshcd_print_err_hist(hba, &hba->ufs_stats.fatal_err, "fatal_err");
+ ufshcd_print_err_hist(hba, &hba->ufs_stats.link_startup_err,
+ "link_startup_fail");
+ ufshcd_print_err_hist(hba, &hba->ufs_stats.resume_err, "resume_fail");
+ ufshcd_print_err_hist(hba, &hba->ufs_stats.suspend_err,
+ "suspend_fail");
+ ufshcd_print_err_hist(hba, &hba->ufs_stats.dev_reset, "dev_reset");
+ ufshcd_print_err_hist(hba, &hba->ufs_stats.host_reset, "host_reset");
+ ufshcd_print_err_hist(hba, &hba->ufs_stats.task_abort, "task_abort");
ufshcd_print_clk_freqs(hba);
@@ -4330,6 +4338,14 @@ static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba)
return ufshcd_disable_tx_lcc(hba, true);
}
+static void ufshcd_update_reg_hist(struct ufs_err_reg_hist *reg_hist,
+ u32 reg)
+{
+ reg_hist->reg[reg_hist->pos] = reg;
+ reg_hist->tstamp[reg_hist->pos] = ktime_get();
+ reg_hist->pos = (reg_hist->pos + 1) % UFS_ERR_REG_HIST_LENGTH;
+}
+
/**
* ufshcd_link_startup - Initialize unipro link startup
* @hba: per adapter instance
@@ -4357,6 +4373,8 @@ link_startup:
/* check if device is detected by inter-connect layer */
if (!ret && !ufshcd_is_device_present(hba)) {
+ ufshcd_update_reg_hist(&hba->ufs_stats.link_startup_err,
+ 0);
dev_err(hba->dev, "%s: Device not present\n", __func__);
ret = -ENXIO;
goto out;
@@ -4367,13 +4385,19 @@ link_startup:
* but we can't be sure if the link is up until link startup
* succeeds. So reset the local Uni-Pro and try again.
*/
- if (ret && ufshcd_hba_enable(hba))
+ if (ret && ufshcd_hba_enable(hba)) {
+ ufshcd_update_reg_hist(&hba->ufs_stats.link_startup_err,
+ (u32)ret);
goto out;
+ }
} while (ret && retries--);
- if (ret)
+ if (ret) {
/* failed to get the link up... retire */
+ ufshcd_update_reg_hist(&hba->ufs_stats.link_startup_err,
+ (u32)ret);
goto out;
+ }
if (link_startup_again) {
link_startup_again = false;
@@ -5349,14 +5373,6 @@ out:
pm_runtime_put_sync(hba->dev);
}
-static void ufshcd_update_reg_hist(struct ufs_err_reg_hist *reg_hist,
- u32 reg)
-{
- reg_hist->reg[reg_hist->pos] = reg;
- reg_hist->tstamp[reg_hist->pos] = ktime_get();
- reg_hist->pos = (reg_hist->pos + 1) % UFS_ERR_REG_HIST_LENGTH;
-}
-
/**
* ufshcd_update_uic_error - check and set fatal UIC error flags.
* @hba: per-adapter instance
@@ -5949,6 +5965,7 @@ static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
out:
hba->req_abort_count = 0;
+ ufshcd_update_reg_hist(&hba->ufs_stats.dev_reset, (u32)err);
if (!err) {
err = SUCCESS;
} else {
@@ -6042,6 +6059,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
*/
scsi_print_command(hba->lrb[tag].cmd);
if (!hba->req_abort_count) {
+ ufshcd_update_reg_hist(&hba->ufs_stats.task_abort, 0);
ufshcd_print_host_regs(hba);
ufshcd_print_host_state(hba);
ufshcd_print_pwr_info(hba);
@@ -6177,7 +6195,7 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
out:
if (err)
dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err);
-
+ ufshcd_update_reg_hist(&hba->ufs_stats.host_reset, (u32)err);
return err;
}
@@ -7819,6 +7837,8 @@ enable_gating:
ufshcd_release(hba);
out:
hba->pm_op_in_progress = 0;
+ if (ret)
+ ufshcd_update_reg_hist(&hba->ufs_stats.suspend_err, (u32)ret);
return ret;
}
@@ -7921,6 +7941,8 @@ disable_irq_and_vops_clks:
ufshcd_setup_clocks(hba, false);
out:
hba->pm_op_in_progress = 0;
+ if (ret)
+ ufshcd_update_reg_hist(&hba->ufs_stats.resume_err, (u32)ret);
return ret;
}
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index c6ec5c749ceb..a43c7135f33d 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -436,8 +436,14 @@ struct ufs_err_reg_hist {
* @nl_err: tracks nl-uic errors
* @tl_err: tracks tl-uic errors
* @dme_err: tracks dme errors
- * @fatal_err: tracks fatal errors
* @auto_hibern8_err: tracks auto-hibernate errors
+ * @fatal_err: tracks fatal errors
+ * @linkup_err: tracks link-startup errors
+ * @resume_err: tracks resume errors
+ * @suspend_err: tracks suspend errors
+ * @dev_reset: tracks device reset events
+ * @host_reset: tracks host reset events
+ * @tsk_abort: tracks task abort events
*/
struct ufs_stats {
u32 hibern8_exit_cnt;
@@ -451,8 +457,16 @@ struct ufs_stats {
struct ufs_err_reg_hist dme_err;
/* fatal errors */
- struct ufs_err_reg_hist fatal_err;
struct ufs_err_reg_hist auto_hibern8_err;
+ struct ufs_err_reg_hist fatal_err;
+ struct ufs_err_reg_hist link_startup_err;
+ struct ufs_err_reg_hist resume_err;
+ struct ufs_err_reg_hist suspend_err;
+
+ /* abnormal events */
+ struct ufs_err_reg_hist dev_reset;
+ struct ufs_err_reg_hist host_reset;
+ struct ufs_err_reg_hist task_abort;
};
/**