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authorTomeu Vizoso <tomeu.vizoso@collabora.com>2014-09-03 17:49:32 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-09-25 01:18:33 +0200
commit7990da71ebfa887ae6fe4464ab0d99ddeb8efacc (patch)
tree26f0b2b19119485b309fa35121872cd7bac0a62e
parent0f33be009b89d2268e94194dc4fd01a7851b6d51 (diff)
downloadop-kernel-dev-7990da71ebfa887ae6fe4464ab0d99ddeb8efacc.zip
op-kernel-dev-7990da71ebfa887ae6fe4464ab0d99ddeb8efacc.tar.gz
PM / QoS: Add PM_QOS_MEMORY_BANDWIDTH class
Also adds a class type PM_QOS_SUM that aggregates the values by summing them. It can be used by memory controllers to calculate the optimum clock frequency based on the bandwidth needs of the different memory clients. Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--Documentation/power/pm_qos_interface.txt4
-rw-r--r--include/linux/pm_qos.h5
-rw-r--r--kernel/power/qos.c27
3 files changed, 33 insertions, 3 deletions
diff --git a/Documentation/power/pm_qos_interface.txt b/Documentation/power/pm_qos_interface.txt
index a5da5c7..129f7c0 100644
--- a/Documentation/power/pm_qos_interface.txt
+++ b/Documentation/power/pm_qos_interface.txt
@@ -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
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 9ab4bf7..636e828 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -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 */
};
/*
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 884b770..5f4c006 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -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();
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