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Message-Id: <20241105112502.710427-3-avri.altman@wdc.com>
Date: Tue, 5 Nov 2024 13:25:02 +0200
From: Avri Altman <avri.altman@....com>
To: "Martin K . Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org,
Bart Van Assche <bvanassche@....org>,
Avri Altman <avri.altman@....com>
Subject: [PATCH v3 2/2] scsi: ufs: core: Introduce a new clock_scaling lock
Introduce a new clock scaling lock to serialize access to some of the
clock scaling members instead of the host_lock. here also, simplify the
code with the guard() macro and co.
Reviewed-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Avri Altman <avri.altman@....com>
---
drivers/ufs/core/ufshcd.c | 126 +++++++++++++++++---------------------
include/ufs/ufshcd.h | 16 +++--
2 files changed, 65 insertions(+), 77 deletions(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 62c0e2323f50..fbc6e3f408af 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -1447,16 +1447,14 @@ static void ufshcd_clk_scaling_suspend_work(struct work_struct *work)
{
struct ufs_hba *hba = container_of(work, struct ufs_hba,
clk_scaling.suspend_work);
- unsigned long irq_flags;
- spin_lock_irqsave(hba->host->host_lock, irq_flags);
- if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended) {
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
- return;
+ scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) {
+ if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended)
+ return;
+
+ hba->clk_scaling.is_suspended = true;
+ hba->clk_scaling.window_start_t = 0;
}
- hba->clk_scaling.is_suspended = true;
- hba->clk_scaling.window_start_t = 0;
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
devfreq_suspend_device(hba->devfreq);
}
@@ -1465,15 +1463,12 @@ static void ufshcd_clk_scaling_resume_work(struct work_struct *work)
{
struct ufs_hba *hba = container_of(work, struct ufs_hba,
clk_scaling.resume_work);
- unsigned long irq_flags;
- spin_lock_irqsave(hba->host->host_lock, irq_flags);
- if (!hba->clk_scaling.is_suspended) {
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
- return;
+ scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) {
+ if (!hba->clk_scaling.is_suspended)
+ return;
+ hba->clk_scaling.is_suspended = false;
}
- hba->clk_scaling.is_suspended = false;
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
devfreq_resume_device(hba->devfreq);
}
@@ -1487,7 +1482,6 @@ static int ufshcd_devfreq_target(struct device *dev,
bool scale_up = false, sched_clk_scaling_suspend_work = false;
struct list_head *clk_list = &hba->clk_list_head;
struct ufs_clk_info *clki;
- unsigned long irq_flags;
if (!ufshcd_is_clkscaling_supported(hba))
return -EINVAL;
@@ -1508,43 +1502,37 @@ static int ufshcd_devfreq_target(struct device *dev,
*freq = (unsigned long) clk_round_rate(clki->clk, *freq);
}
- spin_lock_irqsave(hba->host->host_lock, irq_flags);
- if (ufshcd_eh_in_progress(hba)) {
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
- return 0;
- }
+ scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) {
+ if (ufshcd_eh_in_progress(hba))
+ return 0;
- /* Skip scaling clock when clock scaling is suspended */
- if (hba->clk_scaling.is_suspended) {
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
- dev_warn(hba->dev, "clock scaling is suspended, skip");
- return 0;
- }
+ /* Skip scaling clock when clock scaling is suspended */
+ if (hba->clk_scaling.is_suspended) {
+ dev_warn(hba->dev, "clock scaling is suspended, skip");
+ return 0;
+ }
- if (!hba->clk_scaling.active_reqs)
- sched_clk_scaling_suspend_work = true;
+ if (!hba->clk_scaling.active_reqs)
+ sched_clk_scaling_suspend_work = true;
- if (list_empty(clk_list)) {
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
- goto out;
- }
+ if (list_empty(clk_list))
+ goto out;
- /* Decide based on the target or rounded-off frequency and update */
- if (hba->use_pm_opp)
- scale_up = *freq > hba->clk_scaling.target_freq;
- else
- scale_up = *freq == clki->max_freq;
+ /* Decide based on the target or rounded-off frequency and update */
+ if (hba->use_pm_opp)
+ scale_up = *freq > hba->clk_scaling.target_freq;
+ else
+ scale_up = *freq == clki->max_freq;
- if (!hba->use_pm_opp && !scale_up)
- *freq = clki->min_freq;
+ if (!hba->use_pm_opp && !scale_up)
+ *freq = clki->min_freq;
- /* Update the frequency */
- if (!ufshcd_is_devfreq_scaling_required(hba, *freq, scale_up)) {
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
- ret = 0;
- goto out; /* no state change required */
+ /* Update the frequency */
+ if (!ufshcd_is_devfreq_scaling_required(hba, *freq, scale_up)) {
+ ret = 0;
+ goto out; /* no state change required */
+ }
}
- spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
start = ktime_get();
ret = ufshcd_devfreq_scale(hba, *freq, scale_up);
@@ -1569,7 +1557,6 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev,
{
struct ufs_hba *hba = dev_get_drvdata(dev);
struct ufs_clk_scaling *scaling = &hba->clk_scaling;
- unsigned long flags;
ktime_t curr_t;
if (!ufshcd_is_clkscaling_supported(hba))
@@ -1577,7 +1564,8 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev,
memset(stat, 0, sizeof(*stat));
- spin_lock_irqsave(hba->host->host_lock, flags);
+ guard(spinlock_irqsave)(&hba->clk_scaling.lock);
+
curr_t = ktime_get();
if (!scaling->window_start_t)
goto start_window;
@@ -1613,7 +1601,7 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev,
scaling->busy_start_t = 0;
scaling->is_busy_started = false;
}
- spin_unlock_irqrestore(hba->host->host_lock, flags);
+
return 0;
}
@@ -1677,19 +1665,18 @@ static void ufshcd_devfreq_remove(struct ufs_hba *hba)
static void ufshcd_suspend_clkscaling(struct ufs_hba *hba)
{
- unsigned long flags;
bool suspend = false;
cancel_work_sync(&hba->clk_scaling.suspend_work);
cancel_work_sync(&hba->clk_scaling.resume_work);
- spin_lock_irqsave(hba->host->host_lock, flags);
- if (!hba->clk_scaling.is_suspended) {
- suspend = true;
- hba->clk_scaling.is_suspended = true;
- hba->clk_scaling.window_start_t = 0;
+ scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) {
+ if (!hba->clk_scaling.is_suspended) {
+ suspend = true;
+ hba->clk_scaling.is_suspended = true;
+ hba->clk_scaling.window_start_t = 0;
+ }
}
- spin_unlock_irqrestore(hba->host->host_lock, flags);
if (suspend)
devfreq_suspend_device(hba->devfreq);
@@ -1697,15 +1684,14 @@ static void ufshcd_suspend_clkscaling(struct ufs_hba *hba)
static void ufshcd_resume_clkscaling(struct ufs_hba *hba)
{
- unsigned long flags;
bool resume = false;
- spin_lock_irqsave(hba->host->host_lock, flags);
- if (hba->clk_scaling.is_suspended) {
- resume = true;
- hba->clk_scaling.is_suspended = false;
+ scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) {
+ if (hba->clk_scaling.is_suspended) {
+ resume = true;
+ hba->clk_scaling.is_suspended = false;
+ }
}
- spin_unlock_irqrestore(hba->host->host_lock, flags);
if (resume)
devfreq_resume_device(hba->devfreq);
@@ -1791,6 +1777,8 @@ static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
INIT_WORK(&hba->clk_scaling.resume_work,
ufshcd_clk_scaling_resume_work);
+ spin_lock_init(&hba->clk_scaling.lock);
+
hba->clk_scaling.workq = alloc_ordered_workqueue(
"ufs_clkscaling_%d", WQ_MEM_RECLAIM, hba->host->host_no);
@@ -2143,19 +2131,17 @@ static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
{
bool queue_resume_work = false;
ktime_t curr_t = ktime_get();
- unsigned long flags;
if (!ufshcd_is_clkscaling_supported(hba))
return;
- spin_lock_irqsave(hba->host->host_lock, flags);
+ guard(spinlock_irqsave)(&hba->clk_scaling.lock);
+
if (!hba->clk_scaling.active_reqs++)
queue_resume_work = true;
- if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) {
- spin_unlock_irqrestore(hba->host->host_lock, flags);
+ if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress)
return;
- }
if (queue_resume_work)
queue_work(hba->clk_scaling.workq,
@@ -2171,18 +2157,17 @@ static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
hba->clk_scaling.busy_start_t = curr_t;
hba->clk_scaling.is_busy_started = true;
}
- spin_unlock_irqrestore(hba->host->host_lock, flags);
}
static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
{
struct ufs_clk_scaling *scaling = &hba->clk_scaling;
- unsigned long flags;
if (!ufshcd_is_clkscaling_supported(hba))
return;
- spin_lock_irqsave(hba->host->host_lock, flags);
+ guard(spinlock_irqsave)(&hba->clk_scaling.lock);
+
hba->clk_scaling.active_reqs--;
if (!scaling->active_reqs && scaling->is_busy_started) {
scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
@@ -2190,7 +2175,6 @@ static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
scaling->busy_start_t = 0;
scaling->is_busy_started = false;
}
- spin_unlock_irqrestore(hba->host->host_lock, flags);
}
static inline int ufshcd_monitor_opcode2dir(u8 opcode)
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 8f9997b0dbf9..c449b6cdc1dc 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -435,6 +435,10 @@ struct ufs_clk_gating {
/**
* struct ufs_clk_scaling - UFS clock scaling related data
+ * @workq: workqueue to schedule devfreq suspend/resume work
+ * @suspend_work: worker to suspend devfreq
+ * @resume_work: worker to resume devfreq
+ * @lock: serialize access to some struct ufs_clk_scaling members
* @active_reqs: number of requests that are pending. If this is zero when
* devfreq ->target() function is called then schedule "suspend_work" to
* suspend devfreq.
@@ -444,9 +448,6 @@ struct ufs_clk_gating {
* @enable_attr: sysfs attribute to enable/disable clock scaling
* @saved_pwr_info: UFS power mode may also be changed during scaling and this
* one keeps track of previous power mode.
- * @workq: workqueue to schedule devfreq suspend/resume work
- * @suspend_work: worker to suspend devfreq
- * @resume_work: worker to resume devfreq
* @target_freq: frequency requested by devfreq framework
* @min_gear: lowest HS gear to scale down to
* @is_enabled: tracks if scaling is currently enabled or not, controlled by
@@ -458,15 +459,18 @@ struct ufs_clk_gating {
* @is_suspended: tracks if devfreq is suspended or not
*/
struct ufs_clk_scaling {
+ struct workqueue_struct *workq;
+ struct work_struct suspend_work;
+ struct work_struct resume_work;
+
+ spinlock_t lock;
+
int active_reqs;
unsigned long tot_busy_t;
ktime_t window_start_t;
ktime_t busy_start_t;
struct device_attribute enable_attr;
struct ufs_pa_layer_attr saved_pwr_info;
- struct workqueue_struct *workq;
- struct work_struct suspend_work;
- struct work_struct resume_work;
unsigned long target_freq;
u32 min_gear;
bool is_enabled;
--
2.25.1
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