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Commit 806ee92c authored by Can Guo's avatar Can Guo
Browse files

scsi: ufs: add support for logging custom events 



Add events to command history with tag "custom". These custom events
logging are very useful to see the correlation between normal command
timings and other execution contexts like clock scaling, clock gating,
line reset handling etc.

Change-Id: I6fb7fed8ddcbcea34b868c82d43d2bf1da62f1eb
Signed-off-by: default avatarCan Guo <cang@codeaurora.org>
parent 463d8c28

drivers/scsi/ufs/ufshcd.c

+16 −0
Original line number Diff line number Diff line
@@ -620,6 +620,11 @@ static void ufshcd_dme_cmd_log(struct ufs_hba *hba, char *str, u8 cmd_id) 
	ufshcd_cmd_log(hba, str, "dme", 0, cmd_id, 0);

}



static void ufshcd_custom_cmd_log(struct ufs_hba *hba, char *str)

{

	ufshcd_cmd_log(hba, str, "custom", 0, 0, 0);

}



static void ufshcd_print_cmd_log(struct ufs_hba *hba)

{

	int i;
@@ -670,6 +675,10 @@ static void ufshcd_dme_cmd_log(struct ufs_hba *hba, char *str, u8 cmd_id) 
{

}



static void ufshcd_custom_cmd_log(struct ufs_hba *hba, char *str)

{

}



static void ufshcd_print_cmd_log(struct ufs_hba *hba)

{

}
@@ -10133,11 +10142,14 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up) 
	if (ret)

		goto out;



	ufshcd_custom_cmd_log(hba, "waited-for-DB-clear");



	/* scale down the gear before scaling down clocks */

	if (!scale_up) {

		ret = ufshcd_scale_gear(hba, false);

		if (ret)

			goto clk_scaling_unprepare;

		ufshcd_custom_cmd_log(hba, "Gear-scaled-down");

	}



	/*
@@ -10150,17 +10162,20 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up) 
		if (ret)

			/* link will be bad state so no need to scale_up_gear */

			return ret;

		ufshcd_custom_cmd_log(hba, "Hibern8-entered");

	}



	ret = ufshcd_scale_clks(hba, scale_up);

	if (ret)

		goto scale_up_gear;

	ufshcd_custom_cmd_log(hba, "Clk-freq-switched");



	if (ufshcd_is_auto_hibern8_supported(hba)) {

		ret = ufshcd_uic_hibern8_exit(hba);

		if (ret)

			/* link will be bad state so no need to scale_up_gear */

			return ret;

		ufshcd_custom_cmd_log(hba, "Hibern8-Exited");

	}



	/* scale up the gear after scaling up clocks */
@@ -10170,6 +10185,7 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up) 
			ufshcd_scale_clks(hba, false);

			goto clk_scaling_unprepare;

		}

		ufshcd_custom_cmd_log(hba, "Gear-scaled-up");

	}



	if (!ret) {