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PM: QoS: Drop iterations over global QoS classes 

After commit c3082a674f ("PM: QoS: Get rid of unused flags") the
only global PM QoS class in use is PM_QOS_CPU_DMA_LATENCY, so it
does not really make sense to iterate over global QoS classes
anywhere, since there is only one.

Remove iterations over global QoS classes from the code and use
PM_QOS_CPU_DMA_LATENCY as the target class directly where needed.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Tested-by: Amit Kucheria <amit.kucheria@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2020-02-11 23:59:22 +01:00
parent dcd70ca1a3
commit 63cffc0534
1 changed files with 14 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
kernel/power/qos.c
View File

@ -412,7 +412,8 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
} }
EXPORT_SYMBOL_GPL(pm_qos_remove_notifier); EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
/* User space interface to PM QoS classes via misc devices */ /* User space interface to global PM QoS via misc device. */
static int register_pm_qos_misc(struct pm_qos_object *qos) static int register_pm_qos_misc(struct pm_qos_object *qos)
{ {
qos->pm_qos_power_miscdev.minor = MISC_DYNAMIC_MINOR; qos->pm_qos_power_miscdev.minor = MISC_DYNAMIC_MINOR;
@ -422,35 +423,18 @@ static int register_pm_qos_misc(struct pm_qos_object *qos)
return misc_register(&qos->pm_qos_power_miscdev); return misc_register(&qos->pm_qos_power_miscdev);
} }
static int find_pm_qos_object_by_minor(int minor)
{
int pm_qos_class;
for (pm_qos_class = PM_QOS_CPU_DMA_LATENCY;
pm_qos_class < PM_QOS_NUM_CLASSES; pm_qos_class++) {
if (minor ==
pm_qos_array[pm_qos_class]->pm_qos_power_miscdev.minor)
return pm_qos_class;
}
return -1;
}
static int pm_qos_power_open(struct inode *inode, struct file *filp) static int pm_qos_power_open(struct inode *inode, struct file *filp)
{ {
long pm_qos_class; struct pm_qos_request *req;
pm_qos_class = find_pm_qos_object_by_minor(iminor(inode)); req = kzalloc(sizeof(*req), GFP_KERNEL);
if (pm_qos_class >= PM_QOS_CPU_DMA_LATENCY) {
struct pm_qos_request *req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req) if (!req)
return -ENOMEM; return -ENOMEM;
pm_qos_add_request(req, pm_qos_class, PM_QOS_DEFAULT_VALUE); pm_qos_add_request(req, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
filp->private_data = req; filp->private_data = req;
return 0; return 0;
}
return -EPERM;
} }
static int pm_qos_power_release(struct inode *inode, struct file *filp) static int pm_qos_power_release(struct inode *inode, struct file *filp)
@ -464,7 +448,6 @@ static int pm_qos_power_release(struct inode *inode, struct file *filp)
return 0; return 0;
} }
static ssize_t pm_qos_power_read(struct file *filp, char __user *buf, static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
size_t count, loff_t *f_pos) size_t count, loff_t *f_pos)
{ {
@ -507,26 +490,19 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
return count; return count;
} }
static int __init pm_qos_power_init(void) static int __init pm_qos_power_init(void)
{ {
int ret = 0; int ret;
int i;
BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES); BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES);
for (i = PM_QOS_CPU_DMA_LATENCY; i < PM_QOS_NUM_CLASSES; i++) { ret = register_pm_qos_misc(pm_qos_array[PM_QOS_CPU_DMA_LATENCY]);
ret = register_pm_qos_misc(pm_qos_array[i]); if (ret < 0)
if (ret < 0) { pr_err("%s: %s setup failed\n", __func__,
pr_err("%s: %s setup failed\n", pm_qos_array[PM_QOS_CPU_DMA_LATENCY]->name);
__func__, pm_qos_array[i]->name);
return ret;
}
}
return ret; return ret;
} }
late_initcall(pm_qos_power_init); late_initcall(pm_qos_power_init);
/* Definitions related to the frequency QoS below. */ /* Definitions related to the frequency QoS below. */