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Merge branch 'pm-qos'

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* pm-qos:
  PM / QoS: Add PM_QOS_MEMORY_BANDWIDTH class
This commit is contained in:
Rafael J. Wysocki 2014-10-23 23:02:36 +02:00
commit 37c72cac0e
3 changed files with 33 additions and 3 deletions
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4
Documentation/power/pm_qos_interface.txt
View File

@ -5,7 +5,8 @@ performance expectations by drivers, subsystems and user space applications on
one of the parameters.
Two different PM QoS frameworks are available:
1. PM QoS classes for cpu_dma_latency, network_latency, network_throughput.
1. PM QoS classes for cpu_dma_latency, network_latency, network_throughput,
memory_bandwidth.
2. the per-device PM QoS framework provides the API to manage the per-device latency
constraints and PM QoS flags.
@ -13,6 +14,7 @@ Each parameters have defined units:
* latency: usec
* timeout: usec
* throughput: kbs (kilo bit / sec)
* memory bandwidth: mbs (mega bit / sec)
1. PM QoS framework

5
include/linux/pm_qos.h
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@ -15,6 +15,7 @@ enum {
PM_QOS_CPU_DMA_LATENCY,
PM_QOS_NETWORK_LATENCY,
PM_QOS_NETWORK_THROUGHPUT,
PM_QOS_MEMORY_BANDWIDTH,
/* insert new class ID */
PM_QOS_NUM_CLASSES,
@ -32,6 +33,7 @@ enum pm_qos_flags_status {
#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
#define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE 0
#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0
#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
@ -69,7 +71,8 @@ struct dev_pm_qos_request {
enum pm_qos_type {
PM_QOS_UNITIALIZED,
PM_QOS_MAX, /* return the largest value */
PM_QOS_MIN /* return the smallest value */
PM_QOS_MIN, /* return the smallest value */
PM_QOS_SUM /* return the sum */
};
/*

27
kernel/power/qos.c
View File

@ -105,11 +105,27 @@ static struct pm_qos_object network_throughput_pm_qos = {
};
static BLOCKING_NOTIFIER_HEAD(memory_bandwidth_notifier);
static struct pm_qos_constraints memory_bw_constraints = {
.list = PLIST_HEAD_INIT(memory_bw_constraints.list),
.target_value = PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE,
.default_value = PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE,
.no_constraint_value = PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE,
.type = PM_QOS_SUM,
.notifiers = &memory_bandwidth_notifier,
};
static struct pm_qos_object memory_bandwidth_pm_qos = {
.constraints = &memory_bw_constraints,
.name = "memory_bandwidth",
};
static struct pm_qos_object *pm_qos_array[] = {
&null_pm_qos,
&cpu_dma_pm_qos,
&network_lat_pm_qos,
&network_throughput_pm_qos
&network_throughput_pm_qos,
&memory_bandwidth_pm_qos,
};
static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
@ -130,6 +146,9 @@ static const struct file_operations pm_qos_power_fops = {
/* unlocked internal variant */
static inline int pm_qos_get_value(struct pm_qos_constraints *c)
{
struct plist_node *node;
int total_value = 0;
if (plist_head_empty(&c->list))
return c->no_constraint_value;
@ -140,6 +159,12 @@ static inline int pm_qos_get_value(struct pm_qos_constraints *c)
case PM_QOS_MAX:
return plist_last(&c->list)->prio;
case PM_QOS_SUM:
plist_for_each(node, &c->list)
total_value += node->prio;
return total_value;
default:
/* runtime check for not using enum */
BUG();