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authorZhao Yakui <yakui.zhao@intel.com>2008-01-28 13:54:46 +0800
committerLen Brown <len.brown@intel.com>2008-02-02 02:30:21 -0500
commite4aa5cb2138e7423a6edef6a76a3837b94c2f107 (patch)
tree44a21dd2f2d986fb302ee78e0614cfbba131bc8a /drivers/acpi/processor_throttling.c
parent1180509f6b3ec3ac2505375a78ccd72d270f2169 (diff)
ACPI : Add T-state event notifier function
The t-state coordination should be considered when T-state for one cpu is changed.It means that OSPM should select one proper target T-state for the all affected cpus before updating T-state. So the function of acpi_processor_throttling_notifier is added. Before updating T-state it can be called for all the affected cpus to get the proper target T-state, which can meet the requirement of thermal, user and _TPC. After updating T-state, it can be called to update T-state flag. Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/processor_throttling.c')
-rw-r--r--drivers/acpi/processor_throttling.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index d6780f41d28c..18a873a55256 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -45,6 +45,14 @@
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_throttling");
+struct throttling_tstate {
+ unsigned int cpu; /* cpu nr */
+ int target_state; /* target T-state */
+};
+
+#define THROTTLING_PRECHANGE (1)
+#define THROTTLING_POSTCHANGE (2)
+
static int acpi_processor_get_throttling(struct acpi_processor *pr);
int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
@@ -196,6 +204,70 @@ void acpi_processor_throttling_init(void)
return;
}
+static int acpi_processor_throttling_notifier(unsigned long event, void *data)
+{
+ struct throttling_tstate *p_tstate = data;
+ struct acpi_processor *pr;
+ unsigned int cpu ;
+ int target_state;
+ struct acpi_processor_limit *p_limit;
+ struct acpi_processor_throttling *p_throttling;
+
+ cpu = p_tstate->cpu;
+ pr = processors[cpu];
+ if (!pr) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
+ return 0;
+ }
+ if (!pr->flags.throttling) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is "
+ "unsupported on CPU %d\n", cpu));
+ return 0;
+ }
+ target_state = p_tstate->target_state;
+ p_throttling = &(pr->throttling);
+ switch (event) {
+ case THROTTLING_PRECHANGE:
+ /*
+ * Prechange event is used to choose one proper t-state,
+ * which meets the limits of thermal, user and _TPC.
+ */
+ p_limit = &pr->limit;
+ if (p_limit->thermal.tx > target_state)
+ target_state = p_limit->thermal.tx;
+ if (p_limit->user.tx > target_state)
+ target_state = p_limit->user.tx;
+ if (pr->throttling_platform_limit > target_state)
+ target_state = pr->throttling_platform_limit;
+ if (target_state >= p_throttling->state_count) {
+ printk(KERN_WARNING
+ "Exceed the limit of T-state \n");
+ target_state = p_throttling->state_count - 1;
+ }
+ p_tstate->target_state = target_state;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:"
+ "target T-state of CPU %d is T%d\n",
+ cpu, target_state));
+ break;
+ case THROTTLING_POSTCHANGE:
+ /*
+ * Postchange event is only used to update the
+ * T-state flag of acpi_processor_throttling.
+ */
+ p_throttling->state = target_state;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:"
+ "CPU %d is switched to T%d\n",
+ cpu, target_state));
+ break;
+ default:
+ printk(KERN_WARNING
+ "Unsupported Throttling notifier event\n");
+ break;
+ }
+
+ return 0;
+}
+
/*
* _TPC - Throttling Present Capabilities
*/