ACPI, cpuidle: Clarify C-state description in sysfs
Add a new sysfs entry under cpuidle states. desc - can be used by driver to
communicate to userspace any specific information about the state.
This helps in identifying the exact hardware C-states behind the ACPI C-state
definition.
Idea is to export this through powertop, which will help to map the C-state
reported by powertop to actual hardware C-state.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index cdc8004..06480bc 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -32,9 +32,11 @@
#define DOMAIN_COORD_TYPE_SW_ANY 0xfd
#define DOMAIN_COORD_TYPE_HW_ALL 0xfe
-#define ACPI_CSTATE_SYSTEMIO (0)
-#define ACPI_CSTATE_FFH (1)
-#define ACPI_CSTATE_HALT (2)
+#define ACPI_CSTATE_SYSTEMIO 0
+#define ACPI_CSTATE_FFH 1
+#define ACPI_CSTATE_HALT 2
+
+#define ACPI_CX_DESC_LEN 32
/* Power Management */
@@ -74,6 +76,7 @@
u64 time;
struct acpi_processor_cx_policy promotion;
struct acpi_processor_cx_policy demotion;
+ char desc[ACPI_CX_DESC_LEN];
};
struct acpi_processor_power {
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 385d45b..6b72a45 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -19,6 +19,7 @@
#define CPUIDLE_STATE_MAX 8
#define CPUIDLE_NAME_LEN 16
+#define CPUIDLE_DESC_LEN 32
struct cpuidle_device;
@@ -29,6 +30,7 @@
struct cpuidle_state {
char name[CPUIDLE_NAME_LEN];
+ char desc[CPUIDLE_DESC_LEN];
void *driver_data;
unsigned int flags;