Bus throughput metric is added to PM QoS in order to control the
frequency of memory interfaces and busses with PM QoS.
Signed-off-by: Jonghwa Lee <jonghwa3....@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
include/linux/pm_qos.h | 2 ++
kernel/power/qos.c | 15 ++++++++++++++-
2 files changed, 16 insertions(+), 1 deletions(-)
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 233149c..6db4939 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_BUS_DMA_THROUGHPUT,
/* insert new class ID */
PM_QOS_NUM_CLASSES,
@@ -26,6 +27,7 @@ enum {
#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
#define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
+#define PM_QOS_BUS_DMA_THROUGHPUT_DEFAULT_VALUE 0
struct pm_qos_request {
struct plist_node node;
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 6a031e6..75322cc 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -100,12 +100,25 @@ static struct pm_qos_object network_throughput_pm_qos = {
.name = "network_throughput",
};
+static BLOCKING_NOTIFIER_HEAD(bus_dma_throughput_notifier);
+static struct pm_qos_constraints bus_dma_tput_constraints = {
+ .list = PLIST_HEAD_INIT(bus_dma_tput_constraints.list),
+ .target_value = PM_QOS_BUS_DMA_THROUGHPUT_DEFAULT_VALUE,
+ .default_value = PM_QOS_BUS_DMA_THROUGHPUT_DEFAULT_VALUE,
+ .type = PM_QOS_MAX,
+ .notifiers = &bus_dma_throughput_notifier,
+};
+static struct pm_qos_object bus_dma_throughput_pm_qos = {
+ .constraints = &bus_dma_tput_constraints,
+ .name = "bus_dma_throughput",
+};
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,
+ &bus_dma_throughput_pm_qos,
};
static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
--
1.7.4.1
--
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