[PATCH 10/28] PM: QoS: Rename things related to the CPU latency QoS

Rafael J. Wysocki
2020-02-11T23:39:45Z

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

First, rename PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE to
PM_QOS_CPU_LATENCY_DEFAULT_VALUE and update all of the code
referring to it accordingly.

Next, rename cpu_dma_constraints to cpu_latency_constraints, move
the definition of it closer to the functions referring to it and
update all of them accordingly. [While at it, add a comment to mark
the start of the code related to the CPU latency QoS.]

Finally, rename the pm_qos_power_*() family of functions and
pm_qos_power_fops to cpu_latency_qos_*() and cpu_latency_qos_fops,
respectively, and update the definition of cpu_latency_qos_miscdev.
[While at it, update the miscdev interface code start comment.]

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/tty/serial/8250/8250_omap.c | 6 ++--
drivers/tty/serial/omap-serial.c | 6 ++--
include/linux/pm_qos.h | 2 +-
kernel/power/qos.c | 56 +++++++++++++++++++------------------
4 files changed, 36 insertions(+), 34 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 6f343ca08440..19f8d2f9e7ba 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1222,8 +1222,8 @@ static int omap8250_probe(struct platform_device *pdev)
DEFAULT_CLK_SPEED);
}

- priv->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
- priv->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
+ priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
+ priv->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
pm_qos_add_request(&priv->pm_qos_request, PM_QOS_CPU_DMA_LATENCY,
priv->latency);
INIT_WORK(&priv->qos_work, omap8250_uart_qos_work);
@@ -1445,7 +1445,7 @@ static int omap8250_runtime_suspend(struct device *dev)
if (up->dma && up->dma->rxchan)
omap_8250_rx_dma_flush(up);

- priv->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
+ priv->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
schedule_work(&priv->qos_work);

return 0;
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 48017cec7f2f..ce2558767eee 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1722,8 +1722,8 @@ static int serial_omap_probe(struct platform_device *pdev)
DEFAULT_CLK_SPEED);
}

- up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
- up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
+ up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
+ up->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
pm_qos_add_request(&up->pm_qos_request,
PM_QOS_CPU_DMA_LATENCY, up->latency);
INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
@@ -1869,7 +1869,7 @@ static int serial_omap_runtime_suspend(struct device *dev)

serial_omap_enable_wakeup(up, true);

- up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
+ up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
schedule_work(&up->qos_work);

return 0;
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index cb57e5918a25..a3e0bfc6c470 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -28,7 +28,7 @@ enum pm_qos_flags_status {
#define PM_QOS_LATENCY_ANY S32_MAX
#define PM_QOS_LATENCY_ANY_NS ((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)

-#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
+#define PM_QOS_CPU_LATENCY_DEFAULT_VALUE (2000 * USEC_PER_SEC)
#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE PM_QOS_LATENCY_ANY
#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY
#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS PM_QOS_LATENCY_ANY_NS
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 201b43bc6457..a6bf53e9db17 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -56,14 +56,6 @@
*/
static DEFINE_SPINLOCK(pm_qos_lock);

-static struct pm_qos_constraints cpu_dma_constraints = {
- .list = PLIST_HEAD_INIT(cpu_dma_constraints.list),
- .target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
- .default_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
- .no_constraint_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
- .type = PM_QOS_MIN,
-};
-
/**
* pm_qos_read_value - Return the current effective constraint value.
* @c: List of PM QoS constraint requests.
@@ -227,6 +219,16 @@ bool pm_qos_update_flags(struct pm_qos_flags *pqf,
return prev_value != curr_value;
}

+/* Definitions related to the CPU latency QoS. */
+
+static struct pm_qos_constraints cpu_latency_constraints = {
+ .list = PLIST_HEAD_INIT(cpu_latency_constraints.list),
+ .target_value = PM_QOS_CPU_LATENCY_DEFAULT_VALUE,
+ .default_value = PM_QOS_CPU_LATENCY_DEFAULT_VALUE,
+ .no_constraint_value = PM_QOS_CPU_LATENCY_DEFAULT_VALUE,
+ .type = PM_QOS_MIN,
+};
+
/**
* pm_qos_request - returns current system wide qos expectation
* @pm_qos_class: Ignored.
@@ -235,13 +237,13 @@ bool pm_qos_update_flags(struct pm_qos_flags *pqf,
*/
int pm_qos_request(int pm_qos_class)
{
- return pm_qos_read_value(&cpu_dma_constraints);
+ return pm_qos_read_value(&cpu_latency_constraints);
}
EXPORT_SYMBOL_GPL(pm_qos_request);

int pm_qos_request_active(struct pm_qos_request *req)
{
- return req->qos == &cpu_dma_constraints;
+ return req->qos == &cpu_latency_constraints;
}
EXPORT_SYMBOL_GPL(pm_qos_request_active);

@@ -278,7 +280,7 @@ void pm_qos_add_request(struct pm_qos_request *req,

trace_pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY, value);

- req->qos = &cpu_dma_constraints;
+ req->qos = &cpu_latency_constraints;
cpu_latency_qos_update(req, PM_QOS_ADD_REQ, value);
}
EXPORT_SYMBOL_GPL(pm_qos_add_request);
@@ -338,9 +340,9 @@ void pm_qos_remove_request(struct pm_qos_request *req)
}
EXPORT_SYMBOL_GPL(pm_qos_remove_request);

-/* User space interface to global PM QoS via misc device. */
+/* User space interface to the CPU latency QoS via misc device. */

-static int pm_qos_power_open(struct inode *inode, struct file *filp)
+static int cpu_latency_qos_open(struct inode *inode, struct file *filp)
{
struct pm_qos_request *req;

@@ -354,7 +356,7 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
return 0;
}

-static int pm_qos_power_release(struct inode *inode, struct file *filp)
+static int cpu_latency_qos_release(struct inode *inode, struct file *filp)
{
struct pm_qos_request *req = filp->private_data;

@@ -366,8 +368,8 @@ static int pm_qos_power_release(struct inode *inode, struct file *filp)
return 0;
}

-static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
- size_t count, loff_t *f_pos)
+static ssize_t cpu_latency_qos_read(struct file *filp, char __user *buf,
+ size_t count, loff_t *f_pos)
{
struct pm_qos_request *req = filp->private_data;
unsigned long flags;
@@ -377,14 +379,14 @@ static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
return -EINVAL;

spin_lock_irqsave(&pm_qos_lock, flags);
- value = pm_qos_get_value(&cpu_dma_constraints);
+ value = pm_qos_get_value(&cpu_latency_constraints);
spin_unlock_irqrestore(&pm_qos_lock, flags);

return simple_read_from_buffer(buf, count, f_pos, &value, sizeof(s32));
}

-static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
- size_t count, loff_t *f_pos)
+static ssize_t cpu_latency_qos_write(struct file *filp, const char __user *buf,
+ size_t count, loff_t *f_pos)
{
s32 value;

@@ -404,21 +406,21 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
return count;
}

-static const struct file_operations pm_qos_power_fops = {
- .write = pm_qos_power_write,
- .read = pm_qos_power_read,
- .open = pm_qos_power_open,
- .release = pm_qos_power_release,
+static const struct file_operations cpu_latency_qos_fops = {
+ .write = cpu_latency_qos_write,
+ .read = cpu_latency_qos_read,
+ .open = cpu_latency_qos_open,
+ .release = cpu_latency_qos_release,
.llseek = noop_llseek,
};

static struct miscdevice cpu_latency_qos_miscdev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "cpu_dma_latency",
- .fops = &pm_qos_power_fops,
+ .fops = &cpu_latency_qos_fops,
};

-static int __init pm_qos_power_init(void)
+static int __init cpu_latency_qos_init(void)
{
int ret;

@@ -429,7 +431,7 @@ static int __init pm_qos_power_init(void)

return ret;
}
-late_initcall(pm_qos_power_init);
+late_initcall(cpu_latency_qos_init);

/* Definitions related to the frequency QoS below. */

--
2.16.4