scsi: ufs: Add fatal and auto-hibern8 error history

Provide more information about fatal and auto-hibern8 errors to improve
debugging by extending existing UFS error history framework.

[mkp: typos]
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>

drivers/scsi/ufs/ufshcd.c

@@ -429,6 +429,9 @@ 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_clk_freqs(hba);
 
@@ -5439,8 +5442,10 @@ static void ufshcd_check_errors(struct ufs_hba *hba)
 {
 	bool queue_eh_work = false;
 
-	if (hba->errors & INT_FATAL_ERRORS)
+	if (hba->errors & INT_FATAL_ERRORS) {
+		ufshcd_update_reg_hist(&hba->ufs_stats.fatal_err, hba->errors);
 		queue_eh_work = true;
+	}
 
 	if (hba->errors & UIC_ERROR) {
 		hba->uic_error = 0;
@@ -5455,6 +5460,8 @@ static void ufshcd_check_errors(struct ufs_hba *hba)
 			__func__, (hba->errors & UIC_HIBERNATE_ENTER) ?
 			"Enter" : "Exit",
 			hba->errors, ufshcd_get_upmcrs(hba));
+		ufshcd_update_reg_hist(&hba->ufs_stats.auto_hibern8_err,
+				       hba->errors);
 		queue_eh_work = true;
 	}
 
@@ -6692,6 +6699,8 @@ static void ufshcd_clear_dbg_ufs_stats(struct ufs_hba *hba)
 	memset(&hba->ufs_stats.nl_err, 0, err_reg_hist_size);
 	memset(&hba->ufs_stats.tl_err, 0, err_reg_hist_size);
 	memset(&hba->ufs_stats.dme_err, 0, err_reg_hist_size);
+	memset(&hba->ufs_stats.fatal_err, 0, err_reg_hist_size);
+	memset(&hba->ufs_stats.auto_hibern8_err, 0, err_reg_hist_size);
 
 	hba->req_abort_count = 0;
 }

drivers/scsi/ufs/ufshcd.h

@@ -414,7 +414,7 @@ struct ufs_init_prefetch {
 
 #define UFS_ERR_REG_HIST_LENGTH 8
 /**
- * struct ufs_err_reg_hist - keeps history of uic errors
+ * struct ufs_err_reg_hist - keeps history of errors
  * @pos: index to indicate cyclic buffer position
  * @reg: cyclic buffer for registers value
  * @tstamp: cyclic buffer for time stamp
@@ -436,15 +436,23 @@ 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
  */
 struct ufs_stats {
 	u32 hibern8_exit_cnt;
 	ktime_t last_hibern8_exit_tstamp;
+
+	/* uic specific errors */
 	struct ufs_err_reg_hist pa_err;
 	struct ufs_err_reg_hist dl_err;
 	struct ufs_err_reg_hist nl_err;
 	struct ufs_err_reg_hist tl_err;
 	struct ufs_err_reg_hist dme_err;
+
+	/* fatal errors */
+	struct ufs_err_reg_hist fatal_err;
+	struct ufs_err_reg_hist auto_hibern8_err;
 };
 
 /**