From: Zhang Rui <rui.zhang@xxxxxxxxx>
Add ACPI Processor throttling control sysfs interface.
Attribute Mode Description
state_count RO Maximum throttling state supported by this
processor.
active_state RW the current throttling state.
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/acpi/processor_core.c | 11 ++++++
drivers/acpi/processor_throttling.c | 59 ++++++++++++++++++++++++++++++++++++
include/acpi/processor.h | 3 +
3 files changed, 73 insertions(+)
Index: linux-2.6.21-rc3-mm2/drivers/acpi/processor_throttling.c
===================================================================
--- linux-2.6.21-rc3-mm2.orig/drivers/acpi/processor_throttling.c 2007-03-14 18:47:42.000000000 +0800
+++ linux-2.6.21-rc3-mm2/drivers/acpi/processor_throttling.c 2007-03-14 18:58:59.000000000 +0800
@@ -37,6 +37,7 @@
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
#include <acpi/processor.h>
#define ACPI_PROCESSOR_COMPONENT 0x01000000
@@ -253,6 +254,62 @@ int acpi_processor_get_throttling_info(s
return result;
}
+/* sys interface */
+static ssize_t
+acpi_processor_throttling_state_count_show(struct acpi_device *dev, char *buf)
+{
+ struct acpi_processor *pr = acpi_driver_data(dev);
+
+ if (!pr || !pr->flags.throttling)
+ return -EINVAL;
+
+ return sprintf(buf, "%d\n", pr->throttling.state_count);
+}
+static ACPI_DEVICE_ATTR(state_count, 0444, acpi_processor_throttling_state_count_show, NULL);
+
+static ssize_t
+acpi_processor_throttling_active_state_show(struct acpi_device *dev, char *buf)
+{
+ struct acpi_processor *pr = acpi_driver_data(dev);
+ int result;
+
+ result = acpi_processor_get_throttling(pr);
+ if (result)
+ return result;
+ else
+ return sprintf(buf, "%d\n", pr->throttling.state);
+}
+static ssize_t
+acpi_processor_throttling_active_state_store(struct acpi_device *dev, const char *buf, size_t count)
+{
+ struct acpi_processor *pr = acpi_driver_data(dev);
+ int state, result;
+ char* endp;
+
+ state = simple_strtol(buf, &endp, 0);
+ if (*endp == '\0')
+ return -EINVAL;
+
+ result = acpi_processor_set_throttling(pr, state);
+ if (!result)
+ result = count;
+
+ return result;
+}
+static ACPI_DEVICE_ATTR(active_state, 0644, acpi_processor_throttling_active_state_show, acpi_processor_throttling_active_state_store);
+
+static struct attribute * processor_throttling_attr[] = {
+ GET_ATTR(state_count),
+ GET_ATTR(active_state),
+ NULL,
+};
+
+struct attribute_group processor_throttling_group = {
+ .name = "throttling",
+ .attrs = processor_throttling_attr,
+};
+
+#ifdef CONFIG_ACPI_PROCFS
/* proc interface */
static int acpi_processor_throttling_seq_show(struct seq_file *seq,
@@ -335,3 +392,5 @@ struct file_operations acpi_processor_th
.llseek = seq_lseek,
.release = single_release,
};
+#endif
+
Index: linux-2.6.21-rc3-mm2/include/acpi/processor.h
===================================================================
--- linux-2.6.21-rc3-mm2.orig/include/acpi/processor.h 2007-03-14 18:47:42.000000000 +0800
+++ linux-2.6.21-rc3-mm2/include/acpi/processor.h 2007-03-14 18:58:59.000000000 +0800
@@ -268,7 +268,10 @@ static inline int acpi_processor_ppc_has
/* in processor_throttling.c */
int acpi_processor_get_throttling_info(struct acpi_processor *pr);
int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
+#ifdef CONFIG_ACPI_PROCFS
extern struct file_operations acpi_processor_throttling_fops;
+#endif
+extern struct attribute_group processor_throttling_group;
/* in processor_idle.c */
int acpi_processor_power_init(struct acpi_processor *pr,
Index: linux-2.6.21-rc3-mm2/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.21-rc3-mm2.orig/drivers/acpi/processor_core.c 2007-03-14 18:58:51.000000000 +0800
+++ linux-2.6.21-rc3-mm2/drivers/acpi/processor_core.c 2007-03-14 19:00:36.000000000 +0800
@@ -735,6 +735,12 @@ static int __cpuinit acpi_processor_star
if (result)
goto end;
+ if (pr->flags.throttling) {
+ result =sysfs_create_group(&device->dev.kobj, &processor_throttling_group);
+ if (result)
+ goto throttling_attr_error;
+ }
+
result = acpi_processor_add_procfs(device);
if (result)
goto procfs_error;
@@ -757,6 +763,8 @@ static int __cpuinit acpi_processor_star
goto end;
procfs_error:
+ sysfs_remove_group(&device->dev.kobj, &processor_throttling_group);
+ throttling_attr_error:
acpi_device_remove_sysfs(device, processor_info_attr);
end:
return result;
@@ -841,6 +849,9 @@ static int acpi_processor_remove(struct
acpi_processor_remove_procfs(device);
+ if (pr->flags.throttling)
+ sysfs_remove_group(&device->dev.kobj, &processor_throttling_group);
+
acpi_device_remove_sysfs(device, processor_info_attr);
processors[pr->id] = NULL;
-
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