The following patch adds system_but_throughput as a pm-qos parrameter.
It will help with systems that can adjust clocks on busses.
Thanks,
--mgross
>From ea2aa93aa8705f5b3deb818efefcbad24351c333 Mon Sep 17 00:00:00 2001
From: mgross <mark.gross@xxxxxxxxx>
Date: Sat, 13 Mar 2010 13:07:20 -0800
Subject: [PATCH 2/2] PM_QOS adding system bus throughput to set of classes
Signed-off-by: markgross <mark.gross@xxxxxxxxx>
---
Documentation/power/pm_qos_interface.txt | 7 +++--
include/linux/pm_qos_params.h | 3 +-
kernel/pm_qos_params.c | 31 ++++++++++++++++++++++++-----
3 files changed, 31 insertions(+), 10 deletions(-)
diff --git a/Documentation/power/pm_qos_interface.txt b/Documentation/power/pm_qos_interface.txt
index 2138afb..d37db07 100644
--- a/Documentation/power/pm_qos_interface.txt
+++ b/Documentation/power/pm_qos_interface.txt
@@ -4,8 +4,8 @@ This interface provides a kernel and user mode interface for registering
performance expectations by drivers, subsystems and user space applications on
one of the parameters.
-Currently we have {cpu_dma_latency, network_latency, network_throughput} as the
-initial set of pm_qos parameters.
+Currently we have {cpu_dma_latency, network_latency, network_throughput,
+system_bus_throughput} as the initial set of pm_qos parameters.
Each parameters have defined units:
* latency: usec
@@ -49,7 +49,8 @@ cleanup for process the interface requires the process to register its
parameter requests in the following way:
To register the default pm_qos target for the specific parameter, the process
-must open one of /dev/[cpu_dma_latency, network_latency, network_throughput]
+must open one of /dev/[cpu_dma_latency, network_latency, network_throughput,
+system_bus_throughput]
As long as the device node is held open that process has a registered
request on the parameter.
diff --git a/include/linux/pm_qos_params.h b/include/linux/pm_qos_params.h
index 8ba440e..7459f3d 100644
--- a/include/linux/pm_qos_params.h
+++ b/include/linux/pm_qos_params.h
@@ -10,8 +10,9 @@
#define PM_QOS_CPU_DMA_LATENCY 1
#define PM_QOS_NETWORK_LATENCY 2
#define PM_QOS_NETWORK_THROUGHPUT 3
+#define PM_QOS_SYSTEM_BUS_THROUGHPUT 4
-#define PM_QOS_NUM_CLASSES 4
+#define PM_QOS_NUM_CLASSES 5
#define PM_QOS_DEFAULT_VALUE -1
struct pm_qos_request_list;
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index a1aea04..66368b2 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -104,11 +104,23 @@ static struct pm_qos_object network_throughput_pm_qos = {
};
-static struct pm_qos_object *pm_qos_array[] = {
- &null_pm_qos,
- &cpu_dma_pm_qos,
- &network_lat_pm_qos,
- &network_throughput_pm_qos
+static BLOCKING_NOTIFIER_HEAD(system_bus_throughput_notifier);
+static struct pm_qos_object system_bus_throughput_pm_qos = {
+ .requests = {LIST_HEAD_INIT(system_bus_throughput_pm_qos.requests.list)},
+ .notifiers = &system_bus_throughput_notifier,
+ .name = "system_bus_throughput",
+ .default_value = 0,
+ .target_value = ATOMIC_INIT(0),
+ .comparitor = max_compare
+};
+
+
+static struct pm_qos_object *pm_qos_array[PM_QOS_NUM_CLASSES] = {
+ [PM_QOS_RESERVED] = &null_pm_qos,
+ [PM_QOS_CPU_DMA_LATENCY] = &cpu_dma_pm_qos,
+ [PM_QOS_NETWORK_LATENCY] = &network_lat_pm_qos,
+ [PM_QOS_NETWORK_THROUGHPUT] = &network_throughput_pm_qos,
+ [PM_QOS_SYSTEM_BUS_THROUGHPUT] = &system_bus_throughput_pm_qos,
};
static DEFINE_SPINLOCK(pm_qos_lock);
@@ -401,9 +413,16 @@ static int __init pm_qos_power_init(void)
return ret;
}
ret = register_pm_qos_misc(&network_throughput_pm_qos);
- if (ret < 0)
+ if (ret < 0) {
printk(KERN_ERR
"pm_qos_param: network_throughput setup failed\n");
+ return ret;
+ }
+ ret = register_pm_qos_misc(&system_bus_throughput_pm_qos);
+ if (ret < 0)
+ printk(KERN_ERR
+ "pm_qos_param: system_bus_throughput setup failed\n");
+
return ret;
}
--
1.6.3.3
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