diff options
Diffstat (limited to 'kernel/power/qos.c')
| -rw-r--r-- | kernel/power/qos.c | 124 |
1 files changed, 120 insertions, 4 deletions
diff --git a/kernel/power/qos.c b/kernel/power/qos.c index af51ed6d45ef..f7d8064e9adc 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -220,6 +220,11 @@ static struct pm_qos_constraints cpu_latency_constraints = { .type = PM_QOS_MIN, }; +static inline bool cpu_latency_qos_value_invalid(s32 value) +{ + return value < 0 && value != PM_QOS_DEFAULT_VALUE; +} + /** * cpu_latency_qos_limit - Return current system-wide CPU latency QoS limit. */ @@ -263,7 +268,7 @@ static void cpu_latency_qos_apply(struct pm_qos_request *req, */ void cpu_latency_qos_add_request(struct pm_qos_request *req, s32 value) { - if (!req) + if (!req || cpu_latency_qos_value_invalid(value)) return; if (cpu_latency_qos_request_active(req)) { @@ -289,7 +294,7 @@ EXPORT_SYMBOL_GPL(cpu_latency_qos_add_request); */ void cpu_latency_qos_update_request(struct pm_qos_request *req, s32 new_value) { - if (!req) + if (!req || cpu_latency_qos_value_invalid(new_value)) return; if (!cpu_latency_qos_request_active(req)) { @@ -410,6 +415,105 @@ static struct miscdevice cpu_latency_qos_miscdev = { .fops = &cpu_latency_qos_fops, }; +#ifdef CONFIG_PM_QOS_CPU_SYSTEM_WAKEUP +/* The CPU system wakeup latency QoS. */ +static struct pm_qos_constraints cpu_wakeup_latency_constraints = { + .list = PLIST_HEAD_INIT(cpu_wakeup_latency_constraints.list), + .target_value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT, + .default_value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT, + .no_constraint_value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT, + .type = PM_QOS_MIN, +}; + +/** + * cpu_wakeup_latency_qos_limit - Current CPU system wakeup latency QoS limit. + * + * Returns the current CPU system wakeup latency QoS limit that may have been + * requested by user space. + */ +s32 cpu_wakeup_latency_qos_limit(void) +{ + return pm_qos_read_value(&cpu_wakeup_latency_constraints); +} + +static int cpu_wakeup_latency_qos_open(struct inode *inode, struct file *filp) +{ + struct pm_qos_request *req; + + req = kzalloc(sizeof(*req), GFP_KERNEL); + if (!req) + return -ENOMEM; + + req->qos = &cpu_wakeup_latency_constraints; + pm_qos_update_target(req->qos, &req->node, PM_QOS_ADD_REQ, + PM_QOS_RESUME_LATENCY_NO_CONSTRAINT); + filp->private_data = req; + + return 0; +} + +static int cpu_wakeup_latency_qos_release(struct inode *inode, + struct file *filp) +{ + struct pm_qos_request *req = filp->private_data; + + filp->private_data = NULL; + pm_qos_update_target(req->qos, &req->node, PM_QOS_REMOVE_REQ, + PM_QOS_RESUME_LATENCY_NO_CONSTRAINT); + kfree(req); + + return 0; +} + +static ssize_t cpu_wakeup_latency_qos_read(struct file *filp, char __user *buf, + size_t count, loff_t *f_pos) +{ + s32 value = pm_qos_read_value(&cpu_wakeup_latency_constraints); + + return simple_read_from_buffer(buf, count, f_pos, &value, sizeof(s32)); +} + +static ssize_t cpu_wakeup_latency_qos_write(struct file *filp, + const char __user *buf, + size_t count, loff_t *f_pos) +{ + struct pm_qos_request *req = filp->private_data; + s32 value; + + if (count == sizeof(s32)) { + if (copy_from_user(&value, buf, sizeof(s32))) + return -EFAULT; + } else { + int ret; + + ret = kstrtos32_from_user(buf, count, 16, &value); + if (ret) + return ret; + } + + if (value < 0) + return -EINVAL; + + pm_qos_update_target(req->qos, &req->node, PM_QOS_UPDATE_REQ, value); + + return count; +} + +static const struct file_operations cpu_wakeup_latency_qos_fops = { + .open = cpu_wakeup_latency_qos_open, + .release = cpu_wakeup_latency_qos_release, + .read = cpu_wakeup_latency_qos_read, + .write = cpu_wakeup_latency_qos_write, + .llseek = noop_llseek, +}; + +static struct miscdevice cpu_wakeup_latency_qos_miscdev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "cpu_wakeup_latency", + .fops = &cpu_wakeup_latency_qos_fops, +}; +#endif /* CONFIG_PM_QOS_CPU_SYSTEM_WAKEUP */ + static int __init cpu_latency_qos_init(void) { int ret; @@ -419,6 +523,13 @@ static int __init cpu_latency_qos_init(void) pr_err("%s: %s setup failed\n", __func__, cpu_latency_qos_miscdev.name); +#ifdef CONFIG_PM_QOS_CPU_SYSTEM_WAKEUP + ret = misc_register(&cpu_wakeup_latency_qos_miscdev); + if (ret < 0) + pr_err("%s: %s setup failed\n", __func__, + cpu_wakeup_latency_qos_miscdev.name); +#endif + return ret; } late_initcall(cpu_latency_qos_init); @@ -426,6 +537,11 @@ late_initcall(cpu_latency_qos_init); /* Definitions related to the frequency QoS below. */ +static inline bool freq_qos_value_invalid(s32 value) +{ + return value < 0 && value != PM_QOS_DEFAULT_VALUE; +} + /** * freq_constraints_init - Initialize frequency QoS constraints. * @qos: Frequency QoS constraints to initialize. @@ -531,7 +647,7 @@ int freq_qos_add_request(struct freq_constraints *qos, { int ret; - if (IS_ERR_OR_NULL(qos) || !req || value < 0) + if (IS_ERR_OR_NULL(qos) || !req || freq_qos_value_invalid(value)) return -EINVAL; if (WARN(freq_qos_request_active(req), @@ -563,7 +679,7 @@ EXPORT_SYMBOL_GPL(freq_qos_add_request); */ int freq_qos_update_request(struct freq_qos_request *req, s32 new_value) { - if (!req || new_value < 0) + if (!req || freq_qos_value_invalid(new_value)) return -EINVAL; if (WARN(!freq_qos_request_active(req), |