[PATCH v11 2/3] scsi: ufs: Refactor ufshcd_init/exit_clk_scaling/gating()

From: Can Guo
Date: Wed Jan 20 2021 - 05:26:04 EST

Next message: Maxime Ripard: "Re: [PATCH v3] clk: sunxi-ng: h6: Fix clock divider range on some clocks"
Previous message: David Hildenbrand: "Re: [PATCH] virtio-mem: Assign boolean values to a bool variable"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

ufshcd_hba_exit() is always called after ufshcd_exit_clk_scaling() and
ufshcd_exit_clk_gating(), so move ufshcd_exit_clk_scaling/gating() to
ufshcd_hba_exit(). Meanwhile, add dedicated funcs to init and remove
sysfs nodes of clock scaling/gating to make the code more readable.
Overall functionality remains same.

Reviewed-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 130 +++++++++++++++++++++++++---------------------
drivers/scsi/ufs/ufshcd.h | 4 ++
2 files changed, 74 insertions(+), 60 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 8dc4a3a..750cf0d 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1569,7 +1569,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
return count;
}

-static void ufshcd_clkscaling_init_sysfs(struct ufs_hba *hba)
+static void ufshcd_init_clk_scaling_sysfs(struct ufs_hba *hba)
{
hba->clk_scaling.enable_attr.show = ufshcd_clkscale_enable_show;
hba->clk_scaling.enable_attr.store = ufshcd_clkscale_enable_store;
@@ -1580,6 +1580,42 @@ static void ufshcd_clkscaling_init_sysfs(struct ufs_hba *hba)
dev_err(hba->dev, "Failed to create sysfs for clkscale_enable\n");
}

+static void ufshcd_remove_clk_scaling_sysfs(struct ufs_hba *hba)
+{
+ if (hba->clk_scaling.enable_attr.attr.name)
+ device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
+}
+
+static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
+{
+ char wq_name[sizeof("ufs_clkscaling_00")];
+
+ if (!ufshcd_is_clkscaling_supported(hba))
+ return;
+
+ INIT_WORK(&hba->clk_scaling.suspend_work,
+ ufshcd_clk_scaling_suspend_work);
+ INIT_WORK(&hba->clk_scaling.resume_work,
+ ufshcd_clk_scaling_resume_work);
+
+ snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
+ hba->host->host_no);
+ hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);
+
+ hba->clk_scaling.is_initialized = true;
+}
+
+static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
+{
+ if (!hba->clk_scaling.is_initialized)
+ return;
+
+ ufshcd_remove_clk_scaling_sysfs(hba);
+ destroy_workqueue(hba->clk_scaling.workq);
+ ufshcd_devfreq_remove(hba);
+ hba->clk_scaling.is_initialized = false;
+}
+
static void ufshcd_ungate_work(struct work_struct *work)
{
int ret;
@@ -1871,35 +1907,31 @@ static ssize_t ufshcd_clkgate_enable_store(struct device *dev,
return count;
}

-static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
+static void ufshcd_init_clk_gating_sysfs(struct ufs_hba *hba)
{
- char wq_name[sizeof("ufs_clkscaling_00")];
-
- if (!ufshcd_is_clkscaling_supported(hba))
- return;
-
- if (!hba->clk_scaling.min_gear)
- hba->clk_scaling.min_gear = UFS_HS_G1;
-
- INIT_WORK(&hba->clk_scaling.suspend_work,
- ufshcd_clk_scaling_suspend_work);
- INIT_WORK(&hba->clk_scaling.resume_work,
- ufshcd_clk_scaling_resume_work);
+ hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
+ hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
+ sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
+ hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
+ hba->clk_gating.delay_attr.attr.mode = 0644;
+ if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
+ dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");

- snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
- hba->host->host_no);
- hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);
+ hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show;
+ hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store;
+ sysfs_attr_init(&hba->clk_gating.enable_attr.attr);
+ hba->clk_gating.enable_attr.attr.name = "clkgate_enable";
+ hba->clk_gating.enable_attr.attr.mode = 0644;
+ if (device_create_file(hba->dev, &hba->clk_gating.enable_attr))
+ dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n");
}

-static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
+static void ufshcd_remove_clk_gating_sysfs(struct ufs_hba *hba)
{
- if (!ufshcd_is_clkscaling_supported(hba))
- return;
-
- if (hba->clk_scaling.enable_attr.attr.name)
- device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
- destroy_workqueue(hba->clk_scaling.workq);
- ufshcd_devfreq_remove(hba);
+ if (hba->clk_gating.delay_attr.attr.name)
+ device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
+ if (hba->clk_gating.enable_attr.attr.name)
+ device_remove_file(hba->dev, &hba->clk_gating.enable_attr);
}

static void ufshcd_init_clk_gating(struct ufs_hba *hba)
@@ -1920,34 +1952,21 @@ static void ufshcd_init_clk_gating(struct ufs_hba *hba)
hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue(wq_name,
WQ_MEM_RECLAIM | WQ_HIGHPRI);

- hba->clk_gating.is_enabled = true;
+ ufshcd_init_clk_gating_sysfs(hba);

- hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
- hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
- sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
- hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
- hba->clk_gating.delay_attr.attr.mode = 0644;
- if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
- dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");
-
- hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show;
- hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store;
- sysfs_attr_init(&hba->clk_gating.enable_attr.attr);
- hba->clk_gating.enable_attr.attr.name = "clkgate_enable";
- hba->clk_gating.enable_attr.attr.mode = 0644;
- if (device_create_file(hba->dev, &hba->clk_gating.enable_attr))
- dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n");
+ hba->clk_gating.is_enabled = true;
+ hba->clk_gating.is_initialized = true;
}

static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
- if (!ufshcd_is_clkgating_allowed(hba))
+ if (!hba->clk_gating.is_initialized)
return;
- device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
- device_remove_file(hba->dev, &hba->clk_gating.enable_attr);
+ ufshcd_remove_clk_gating_sysfs(hba);
cancel_work_sync(&hba->clk_gating.ungate_work);
cancel_delayed_work_sync(&hba->clk_gating.gate_work);
destroy_workqueue(hba->clk_gating.clk_gating_workq);
+ hba->clk_gating.is_initialized = false;
}

/* Must be called with host lock acquired */
@@ -7747,7 +7766,7 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
goto out;

hba->clk_scaling.is_enabled = true;
- ufshcd_clkscaling_init_sysfs(hba);
+ ufshcd_init_clk_scaling_sysfs(hba);
}
}

@@ -7935,7 +7954,6 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
*/
if (ret) {
pm_runtime_put_sync(hba->dev);
- ufshcd_exit_clk_scaling(hba);
ufshcd_hba_exit(hba);
} else {
ufshcd_clear_ua_wluns(hba);
@@ -8365,12 +8383,12 @@ static int ufshcd_hba_init(struct ufs_hba *hba)
static void ufshcd_hba_exit(struct ufs_hba *hba)
{
if (hba->is_powered) {
+ ufshcd_exit_clk_scaling(hba);
+ ufshcd_exit_clk_gating(hba);
+ if (hba->eh_wq)
+ destroy_workqueue(hba->eh_wq);
ufshcd_variant_hba_exit(hba);
ufshcd_setup_vreg(hba, false);
- ufshcd_suspend_clkscaling(hba);
- if (ufshcd_is_clkscaling_supported(hba))
- if (hba->devfreq)
- ufshcd_suspend_clkscaling(hba);
ufshcd_setup_clocks(hba, false);
ufshcd_setup_hba_vreg(hba, false);
hba->is_powered = false;
@@ -9144,13 +9162,9 @@ void ufshcd_remove(struct ufs_hba *hba)
blk_mq_free_tag_set(&hba->tmf_tag_set);
blk_cleanup_queue(hba->cmd_queue);
scsi_remove_host(hba->host);
- destroy_workqueue(hba->eh_wq);
/* disable interrupts */
ufshcd_disable_intr(hba, hba->intr_mask);
ufshcd_hba_stop(hba);
-
- ufshcd_exit_clk_scaling(hba);
- ufshcd_exit_clk_gating(hba);
ufshcd_hba_exit(hba);
}
EXPORT_SYMBOL_GPL(ufshcd_remove);
@@ -9351,7 +9365,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
if (err) {
dev_err(hba->dev, "request irq failed\n");
- goto exit_gating;
+ goto out_disable;
} else {
hba->is_irq_enabled = true;
}
@@ -9359,7 +9373,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
err = scsi_add_host(host, hba->dev);
if (err) {
dev_err(hba->dev, "scsi_add_host failed\n");
- goto exit_gating;
+ goto out_disable;
}

hba->cmd_queue = blk_mq_init_queue(&hba->host->tag_set);
@@ -9442,10 +9456,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
blk_cleanup_queue(hba->cmd_queue);
out_remove_scsi_host:
scsi_remove_host(hba->host);
-exit_gating:
- ufshcd_exit_clk_scaling(hba);
- ufshcd_exit_clk_gating(hba);
- destroy_workqueue(hba->eh_wq);
out_disable:
hba->is_irq_enabled = false;
ufshcd_hba_exit(hba);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 2863af1..9cd76f7 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -383,6 +383,7 @@ enum clk_gating_state {
* @delay_attr: sysfs attribute to control delay_attr
* @enable_attr: sysfs attribute to enable/disable clock gating
* @is_enabled: Indicates the current status of clock gating
+ * @is_initialized: Indicates whether clock gating is initialized or not
* @active_reqs: number of requests that are pending and should be waited for
* completion before gating clocks.
*/
@@ -395,6 +396,7 @@ struct ufs_clk_gating {
struct device_attribute delay_attr;
struct device_attribute enable_attr;
bool is_enabled;
+ bool is_initialized;
int active_reqs;
struct workqueue_struct *clk_gating_workq;
};
@@ -423,6 +425,7 @@ struct ufs_saved_pwr_info {
clkscale_enable sysfs node
* @is_allowed: tracks if scaling is currently allowed or not, used to block
clock scaling which is not invoked from devfreq governor
+ * @is_initialized: Indicates whether clock scaling is initialized or not
* @is_busy_started: tracks if busy period has started or not
* @is_suspended: tracks if devfreq is suspended or not
*/
@@ -439,6 +442,7 @@ struct ufs_clk_scaling {
u32 min_gear;
bool is_enabled;
bool is_allowed;
+ bool is_initialized;
bool is_busy_started;
bool is_suspended;
};
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.

Next message: Maxime Ripard: "Re: [PATCH v3] clk: sunxi-ng: h6: Fix clock divider range on some clocks"
Previous message: David Hildenbrand: "Re: [PATCH] virtio-mem: Assign boolean values to a bool variable"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]