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Date: Tue, 13 Dec 2016 11:51:56 -0800
From: Subhash Jadavani <subhashj@...eaurora.org>
To: vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
martin.petersen@...cle.com
Cc: linux-scsi@...r.kernel.org,
Subhash Jadavani <subhashj@...eaurora.org>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>,
Lee Susman <lsusman@...eaurora.org>,
Venkat Gopalakrishnan <venkatg@...eaurora.org>,
Sahitya Tummala <stummala@...eaurora.org>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 10/12] 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@...eaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
---
drivers/scsi/ufs/ufshcd.c | 24 ++++++++++++++++++++++++
include/trace/events/ufs.h | 40 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 64 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 70742f9..33f3947 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3048,11 +3048,14 @@ 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",
@@ -3088,11 +3091,15 @@ 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);
@@ -5978,6 +5985,8 @@ 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;
@@ -5991,6 +6000,7 @@ 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) {
@@ -6026,6 +6036,10 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
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;
}
@@ -7030,6 +7044,8 @@ 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;
@@ -7043,6 +7059,8 @@ 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",
@@ -7060,6 +7078,8 @@ 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",
@@ -7081,6 +7101,10 @@ 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 7b3d9e1..8bce504 100644
--- a/include/trace/events/ufs.h
+++ b/include/trace/events/ufs.h
@@ -87,6 +87,46 @@
__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,
const char *dev_state, const char *link_state),
--
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