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authorAshwin Chaugule <ashwin.chaugule@linaro.org>2015-08-05 09:40:25 -0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-08-25 03:25:47 +0200
commit239708a3af44064366f1af0eea02dc1e8991c11b (patch)
tree3660c0e42ac0c18b322239aadba3505b791cb772 /include/acpi
parentd3c68f218f927bd4b14b586ea2dcecee54cf09ad (diff)
ACPI: Split out ACPI PSS from ACPI Processor driver
The ACPI processor driver is currently tied too closely to the ACPI P-states (PSS) and other related constructs for controlling CPU performance. The newer ACPI specification (v5.1 onwards) introduces alternative methods to PSS. These new mechanisms are described within each ACPI Processor object and so they need to be scanned whenever a new Processor object is detected. This patch introduces a new Kconfig symbol to allow for finer configurability among the two options for controlling performance states. There is no change in functionality and the option is auto-selected by the architectures which support it. A future commit will introduce support for CPPC: A newer method of controlling CPU performance. The OS is not expected to support CPPC and PSS at the same time, so the Kconfig option lets us make the two mutually exclusive at compile time. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> [ rjw: Changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/processor.h28
1 files changed, 26 insertions, 2 deletions
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 4188a4d3b597..b6c917835805 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -318,6 +318,7 @@ int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
void acpi_processor_set_pdc(acpi_handle handle);
/* in processor_throttling.c */
+#ifdef CONFIG_ACPI_CPU_FREQ_PSS
int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
int acpi_processor_get_throttling_info(struct acpi_processor *pr);
extern int acpi_processor_set_throttling(struct acpi_processor *pr,
@@ -330,6 +331,29 @@ extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
unsigned long action);
extern const struct file_operations acpi_processor_throttling_fops;
extern void acpi_processor_throttling_init(void);
+#else
+static inline int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
+{
+ return 0;
+}
+
+static inline int acpi_processor_get_throttling_info(struct acpi_processor *pr)
+{
+ return -ENODEV;
+}
+
+static inline int acpi_processor_set_throttling(struct acpi_processor *pr,
+ int state, bool force)
+{
+ return -ENODEV;
+}
+
+static inline void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
+ unsigned long action) {}
+
+static inline void acpi_processor_throttling_init(void) {}
+#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
+
/* in processor_idle.c */
int acpi_processor_power_init(struct acpi_processor *pr);
int acpi_processor_power_exit(struct acpi_processor *pr);
@@ -348,7 +372,7 @@ static inline void acpi_processor_syscore_exit(void) {}
/* in processor_thermal.c */
int acpi_processor_get_limit_info(struct acpi_processor *pr);
extern const struct thermal_cooling_device_ops processor_cooling_ops;
-#ifdef CONFIG_CPU_FREQ
+#if defined(CONFIG_ACPI_CPU_FREQ_PSS) & defined(CONFIG_CPU_FREQ)
void acpi_thermal_cpufreq_init(void);
void acpi_thermal_cpufreq_exit(void);
#else
@@ -360,6 +384,6 @@ static inline void acpi_thermal_cpufreq_exit(void)
{
return;
}
-#endif
+#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
#endif

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