scsi: ufs: add time profiling support
This patch adds the profiling support for some of the time critical
operations like hibern8 enter/exit, clock gating & clock scaling.
Reviewed-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 184106f..58c4df4 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3021,11 +3021,14 @@
{
int ret;
struct uic_command uic_cmd = {0};
+ ktime_t start = ktime_get();
ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER, PRE_CHANGE);
uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;
ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
+ trace_ufshcd_profile_hibern8(dev_name(hba->dev), "enter",
+ ktime_to_us(ktime_sub(ktime_get(), start)), ret);
if (ret) {
dev_err(hba->dev, "%s: hibern8 enter failed. ret = %d\n",
@@ -3061,11 +3064,15 @@
{
struct uic_command uic_cmd = {0};
int ret;
+ ktime_t start = ktime_get();
ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT, PRE_CHANGE);
uic_cmd.command = UIC_CMD_DME_HIBER_EXIT;
ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
+ trace_ufshcd_profile_hibern8(dev_name(hba->dev), "exit",
+ ktime_to_us(ktime_sub(ktime_get(), start)), ret);
+
if (ret) {
dev_err(hba->dev, "%s: hibern8 exit failed. ret = %d\n",
__func__, ret);
@@ -5950,6 +5957,8 @@
struct ufs_clk_info *clki;
struct list_head *head = &hba->clk_list_head;
unsigned long flags;
+ ktime_t start = ktime_get();
+ bool clk_state_changed = false;
if (!head || list_empty(head))
goto out;
@@ -5963,6 +5972,7 @@
if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
continue;
+ clk_state_changed = on ^ clki->enabled;
if (on && !clki->enabled) {
ret = clk_prepare_enable(clki->clk);
if (ret) {
@@ -5997,6 +6007,10 @@
spin_unlock_irqrestore(hba->host->host_lock, flags);
}
+ if (clk_state_changed)
+ trace_ufshcd_profile_clk_gating(dev_name(hba->dev),
+ (on ? "on" : "off"),
+ ktime_to_us(ktime_sub(ktime_get(), start)), ret);
return ret;
}
@@ -6996,6 +7010,8 @@
int ret = 0;
struct ufs_clk_info *clki;
struct list_head *head = &hba->clk_list_head;
+ ktime_t start = ktime_get();
+ bool clk_state_changed = false;
if (!head || list_empty(head))
goto out;
@@ -7009,6 +7025,8 @@
if (scale_up && clki->max_freq) {
if (clki->curr_freq == clki->max_freq)
continue;
+
+ clk_state_changed = true;
ret = clk_set_rate(clki->clk, clki->max_freq);
if (ret) {
dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
@@ -7026,6 +7044,8 @@
} else if (!scale_up && clki->min_freq) {
if (clki->curr_freq == clki->min_freq)
continue;
+
+ clk_state_changed = true;
ret = clk_set_rate(clki->clk, clki->min_freq);
if (ret) {
dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
@@ -7047,6 +7067,10 @@
ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);
out:
+ if (clk_state_changed)
+ trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
+ (scale_up ? "up" : "down"),
+ ktime_to_us(ktime_sub(ktime_get(), start)), ret);
return ret;
}
diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
index 57743b6..e9634df 100644
--- a/include/trace/events/ufs.h
+++ b/include/trace/events/ufs.h
@@ -123,6 +123,46 @@
__get_str(dev_name), __get_str(state))
);
+DECLARE_EVENT_CLASS(ufshcd_profiling_template,
+ TP_PROTO(const char *dev_name, const char *profile_info, s64 time_us,
+ int err),
+
+ TP_ARGS(dev_name, profile_info, time_us, err),
+
+ TP_STRUCT__entry(
+ __string(dev_name, dev_name)
+ __string(profile_info, profile_info)
+ __field(s64, time_us)
+ __field(int, err)
+ ),
+
+ TP_fast_assign(
+ __assign_str(dev_name, dev_name);
+ __assign_str(profile_info, profile_info);
+ __entry->time_us = time_us;
+ __entry->err = err;
+ ),
+
+ TP_printk("%s: %s: took %lld usecs, err %d",
+ __get_str(dev_name), __get_str(profile_info),
+ __entry->time_us, __entry->err)
+);
+
+DEFINE_EVENT(ufshcd_profiling_template, ufshcd_profile_hibern8,
+ TP_PROTO(const char *dev_name, const char *profile_info, s64 time_us,
+ int err),
+ TP_ARGS(dev_name, profile_info, time_us, err));
+
+DEFINE_EVENT(ufshcd_profiling_template, ufshcd_profile_clk_gating,
+ TP_PROTO(const char *dev_name, const char *profile_info, s64 time_us,
+ int err),
+ TP_ARGS(dev_name, profile_info, time_us, err));
+
+DEFINE_EVENT(ufshcd_profiling_template, ufshcd_profile_clk_scaling,
+ TP_PROTO(const char *dev_name, const char *profile_info, s64 time_us,
+ int err),
+ TP_ARGS(dev_name, profile_info, time_us, err));
+
DECLARE_EVENT_CLASS(ufshcd_template,
TP_PROTO(const char *dev_name, int err, s64 usecs,
int dev_state, int link_state),