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scsi: ufs: add tracing support

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This change adds the ftrace support for following:
1. UFS initialization time
2. Clock gating states
3. Clock scaling states
4. Power management APIs latency
5. BKOPs enable/disable

Usage:
	echo 1 > /sys/kernel/debug/tracing/events/ufs/enable
	cat /sys/kernel/debug/tracing/trace_pipe

Reviewed-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
subhashj@codeaurora.org 2016-12-22 18:39:51 -08:00 committed by Martin K. Petersen
parent 66cc820f9c
commit 7ff5ab4736
2 changed files with 258 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
drivers/scsi/ufs/ufshcd.c
View File

@ -45,6 +45,9 @@
#include "ufs_quirks.h"
#include "unipro.h"
#define CREATE_TRACE_POINTS
#include <trace/events/ufs.h>
#define UFSHCD_REQ_SENSE_SIZE 18
#define UFSHCD_ENABLE_INTRS (UTP_TRANSFER_REQ_COMPL |\
@ -801,6 +804,8 @@ start:
case REQ_CLKS_OFF:
if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
hba->clk_gating.state = CLKS_ON;
trace_ufshcd_clk_gating(dev_name(hba->dev),
hba->clk_gating.state);
break;
}
/*
@ -811,6 +816,8 @@ start:
case CLKS_OFF:
scsi_block_requests(hba->host);
hba->clk_gating.state = REQ_CLKS_ON;
trace_ufshcd_clk_gating(dev_name(hba->dev),
hba->clk_gating.state);
schedule_work(&hba->clk_gating.ungate_work);
/*
* fall through to check if we should wait for this
@ -855,6 +862,8 @@ static void ufshcd_gate_work(struct work_struct *work)
if (hba->clk_gating.is_suspended ||
(hba->clk_gating.state == REQ_CLKS_ON)) {
hba->clk_gating.state = CLKS_ON;
trace_ufshcd_clk_gating(dev_name(hba->dev),
hba->clk_gating.state);
goto rel_lock;
}
@ -870,6 +879,8 @@ static void ufshcd_gate_work(struct work_struct *work)
if (ufshcd_can_hibern8_during_gating(hba)) {
if (ufshcd_uic_hibern8_enter(hba)) {
hba->clk_gating.state = CLKS_ON;
trace_ufshcd_clk_gating(dev_name(hba->dev),
hba->clk_gating.state);
goto out;
}
ufshcd_set_link_hibern8(hba);
@ -893,9 +904,11 @@ static void ufshcd_gate_work(struct work_struct *work)
* new requests arriving before the current cancel work is done.
*/
spin_lock_irqsave(hba->host->host_lock, flags);
if (hba->clk_gating.state == REQ_CLKS_OFF)
if (hba->clk_gating.state == REQ_CLKS_OFF) {
hba->clk_gating.state = CLKS_OFF;
trace_ufshcd_clk_gating(dev_name(hba->dev),
hba->clk_gating.state);
}
rel_lock:
spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
@ -918,6 +931,7 @@ static void __ufshcd_release(struct ufs_hba *hba)
return;
hba->clk_gating.state = REQ_CLKS_OFF;
trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state);
schedule_delayed_work(&hba->clk_gating.gate_work,
msecs_to_jiffies(hba->clk_gating.delay_ms));
}
@ -3932,6 +3946,7 @@ static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
}
hba->auto_bkops_enabled = true;
trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Enabled");
/* No need of URGENT_BKOPS exception from the device */
err = ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
@ -3982,6 +3997,7 @@ static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
}
hba->auto_bkops_enabled = false;
trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Disabled");
out:
return err;
}
@ -5377,6 +5393,7 @@ static void ufshcd_tune_unipro_params(struct ufs_hba *hba)
static int ufshcd_probe_hba(struct ufs_hba *hba)
{
int ret;
ktime_t start = ktime_get();
ret = ufshcd_link_startup(hba);
if (ret)
@ -5468,6 +5485,9 @@ out:
ufshcd_hba_exit(hba);
}
trace_ufshcd_init(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->uic_link_state, hba->curr_dev_pwr_mode);
return ret;
}
@ -5817,11 +5837,14 @@ out:
if (!IS_ERR_OR_NULL(clki->clk) && clki->enabled)
clk_disable_unprepare(clki->clk);
}
} else if (on) {
} else if (!ret && on) {
spin_lock_irqsave(hba->host->host_lock, flags);
hba->clk_gating.state = CLKS_ON;
trace_ufshcd_clk_gating(dev_name(hba->dev),
hba->clk_gating.state);
spin_unlock_irqrestore(hba->host->host_lock, flags);
}
return ret;
}
@ -6304,6 +6327,7 @@ disable_clks:
__ufshcd_setup_clocks(hba, false, true);
hba->clk_gating.state = CLKS_OFF;
trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state);
/*
* Disable the host irq as host controller as there won't be any
* host controller transaction expected till resume.
@ -6436,6 +6460,7 @@ out:
int ufshcd_system_suspend(struct ufs_hba *hba)
{
int ret = 0;
ktime_t start = ktime_get();
if (!hba || !hba->is_powered)
return 0;
@ -6462,6 +6487,9 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
ret = ufshcd_suspend(hba, UFS_SYSTEM_PM);
out:
trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->uic_link_state, hba->curr_dev_pwr_mode);
if (!ret)
hba->is_sys_suspended = true;
return ret;
@ -6477,6 +6505,9 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
int ufshcd_system_resume(struct ufs_hba *hba)
{
int ret = 0;
ktime_t start = ktime_get();
if (!hba)
return -EINVAL;
@ -6485,9 +6516,14 @@ int ufshcd_system_resume(struct ufs_hba *hba)
* Let the runtime resume take care of resuming
* if runtime suspended.
*/
return 0;
return ufshcd_resume(hba, UFS_SYSTEM_PM);
goto out;
else
ret = ufshcd_resume(hba, UFS_SYSTEM_PM);
out:
trace_ufshcd_system_resume(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->uic_link_state, hba->curr_dev_pwr_mode);
return ret;
}
EXPORT_SYMBOL(ufshcd_system_resume);
@ -6501,13 +6537,21 @@ EXPORT_SYMBOL(ufshcd_system_resume);
*/
int ufshcd_runtime_suspend(struct ufs_hba *hba)
{
int ret = 0;
ktime_t start = ktime_get();
if (!hba)
return -EINVAL;
if (!hba->is_powered)
return 0;
return ufshcd_suspend(hba, UFS_RUNTIME_PM);
goto out;
else
ret = ufshcd_suspend(hba, UFS_RUNTIME_PM);
out:
trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->uic_link_state, hba->curr_dev_pwr_mode);
return ret;
}
EXPORT_SYMBOL(ufshcd_runtime_suspend);
@ -6534,13 +6578,21 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
*/
int ufshcd_runtime_resume(struct ufs_hba *hba)
{
int ret = 0;
ktime_t start = ktime_get();
if (!hba)
return -EINVAL;
if (!hba->is_powered)
return 0;
return ufshcd_resume(hba, UFS_RUNTIME_PM);
goto out;
else
ret = ufshcd_resume(hba, UFS_RUNTIME_PM);
out:
trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
hba->uic_link_state, hba->curr_dev_pwr_mode);
return ret;
}
EXPORT_SYMBOL(ufshcd_runtime_resume);
@ -6684,6 +6736,11 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
clki->max_freq, ret);
break;
}
trace_ufshcd_clk_scaling(dev_name(hba->dev),
"scaled up", clki->name,
clki->curr_freq,
clki->max_freq);
clki->curr_freq = clki->max_freq;
} else if (!scale_up && clki->min_freq) {
@ -6696,6 +6753,10 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
clki->min_freq, ret);
break;
}
trace_ufshcd_clk_scaling(dev_name(hba->dev),
"scaled down", clki->name,
clki->curr_freq,
clki->min_freq);
clki->curr_freq = clki->min_freq;
}
}

185
include/trace/events/ufs.h Normal file
View File

@ -0,0 +1,185 @@
/*
* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM ufs
#if !defined(_TRACE_UFS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_UFS_H
#include <linux/tracepoint.h>
#define UFS_LINK_STATES \
EM(UIC_LINK_OFF_STATE) \
EM(UIC_LINK_ACTIVE_STATE) \
EMe(UIC_LINK_HIBERN8_STATE)
#define UFS_PWR_MODES \
EM(UFS_ACTIVE_PWR_MODE) \
EM(UFS_SLEEP_PWR_MODE) \
EMe(UFS_POWERDOWN_PWR_MODE)
#define UFSCHD_CLK_GATING_STATES \
EM(CLKS_OFF) \
EM(CLKS_ON) \
EM(REQ_CLKS_OFF) \
EMe(REQ_CLKS_ON)
/* Enums require being exported to userspace, for user tool parsing */
#undef EM
#undef EMe
#define EM(a) TRACE_DEFINE_ENUM(a);
#define EMe(a) TRACE_DEFINE_ENUM(a);
UFS_LINK_STATES;
UFS_PWR_MODES;
UFSCHD_CLK_GATING_STATES;
/*
* Now redefine the EM() and EMe() macros to map the enums to the strings
* that will be printed in the output.
*/
#undef EM
#undef EMe
#define EM(a) { a, #a },
#define EMe(a) { a, #a }
TRACE_EVENT(ufshcd_clk_gating,
TP_PROTO(const char *dev_name, int state),
TP_ARGS(dev_name, state),
TP_STRUCT__entry(
__string(dev_name, dev_name)
__field(int, state)
),
TP_fast_assign(
__assign_str(dev_name, dev_name);
__entry->state = state;
),
TP_printk("%s: gating state changed to %s",
__get_str(dev_name),
__print_symbolic(__entry->state, UFSCHD_CLK_GATING_STATES))
);
TRACE_EVENT(ufshcd_clk_scaling,
TP_PROTO(const char *dev_name, const char *state, const char *clk,
u32 prev_state, u32 curr_state),
TP_ARGS(dev_name, state, clk, prev_state, curr_state),
TP_STRUCT__entry(
__string(dev_name, dev_name)
__string(state, state)
__string(clk, clk)
__field(u32, prev_state)
__field(u32, curr_state)
),
TP_fast_assign(
__assign_str(dev_name, dev_name);
__assign_str(state, state);
__assign_str(clk, clk);
__entry->prev_state = prev_state;
__entry->curr_state = curr_state;
),
TP_printk("%s: %s %s from %u to %u Hz",
__get_str(dev_name), __get_str(state), __get_str(clk),
__entry->prev_state, __entry->curr_state)
);
TRACE_EVENT(ufshcd_auto_bkops_state,
TP_PROTO(const char *dev_name, const char *state),
TP_ARGS(dev_name, state),
TP_STRUCT__entry(
__string(dev_name, dev_name)
__string(state, state)
),
TP_fast_assign(
__assign_str(dev_name, dev_name);
__assign_str(state, state);
),
TP_printk("%s: auto bkops - %s",
__get_str(dev_name), __get_str(state))
);
DECLARE_EVENT_CLASS(ufshcd_template,
TP_PROTO(const char *dev_name, int err, s64 usecs,
int dev_state, int link_state),
TP_ARGS(dev_name, err, usecs, dev_state, link_state),
TP_STRUCT__entry(
__field(s64, usecs)
__field(int, err)
__string(dev_name, dev_name)
__field(int, dev_state)
__field(int, link_state)
),
TP_fast_assign(
__entry->usecs = usecs;
__entry->err = err;
__assign_str(dev_name, dev_name);
__entry->dev_state = dev_state;
__entry->link_state = link_state;
),
TP_printk(
"%s: took %lld usecs, dev_state: %s, link_state: %s, err %d",
__get_str(dev_name),
__entry->usecs,
__print_symbolic(__entry->dev_state, UFS_PWR_MODES),
__print_symbolic(__entry->link_state, UFS_LINK_STATES),
__entry->err
)
);
DEFINE_EVENT(ufshcd_template, ufshcd_system_suspend,
TP_PROTO(const char *dev_name, int err, s64 usecs,
int dev_state, int link_state),
TP_ARGS(dev_name, err, usecs, dev_state, link_state));
DEFINE_EVENT(ufshcd_template, ufshcd_system_resume,
TP_PROTO(const char *dev_name, int err, s64 usecs,
int dev_state, int link_state),
TP_ARGS(dev_name, err, usecs, dev_state, link_state));
DEFINE_EVENT(ufshcd_template, ufshcd_runtime_suspend,
TP_PROTO(const char *dev_name, int err, s64 usecs,
int dev_state, int link_state),
TP_ARGS(dev_name, err, usecs, dev_state, link_state));
DEFINE_EVENT(ufshcd_template, ufshcd_runtime_resume,
TP_PROTO(const char *dev_name, int err, s64 usecs,
int dev_state, int link_state),
TP_ARGS(dev_name, err, usecs, dev_state, link_state));
DEFINE_EVENT(ufshcd_template, ufshcd_init,
TP_PROTO(const char *dev_name, int err, s64 usecs,
int dev_state, int link_state),
TP_ARGS(dev_name, err, usecs, dev_state, link_state));
#endif /* if !defined(_TRACE_UFS_H) || defined(TRACE_HEADER_MULTI_READ) */
/* This part must be outside protection */
#include <trace/define_trace.h>