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 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3021,11 +3021,14 @@ static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
 {
        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 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
 {
        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 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
        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 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
                        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 @@ out:
                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 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
        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 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
                        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 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
                        } 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 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
        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 (file)
--- a/include/trace/events/ufs.h
+++ b/include/trace/events/ufs.h
@@ -123,6 +123,46 @@ TRACE_EVENT(ufshcd_auto_bkops_state,
                __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),