In order to better support future Intel processors, intel_pstate
changes to use percentage values to tune P-states. The intel_pstate
driver uses its own internal governor, and it is recorded in the
"policy->policy" field. The setpolicy driver interface is used to
configure the intel_pstate internal policy. The __cpufreq_set_policy
needs to be intercepted to use the setpolicy driver if it exists.
Signed-off-by: Wei Wang <wei.w.w...@intel.com>
---
xen/drivers/cpufreq/utility.c | 5 +++++
xen/include/acpi/cpufreq/cpufreq.h | 11 +++++++++++
2 files changed, 16 insertions(+)
diff --git a/xen/drivers/cpufreq/utility.c b/xen/drivers/cpufreq/utility.c
index 519f862..04f88c2 100644
--- a/xen/drivers/cpufreq/utility.c
+++ b/xen/drivers/cpufreq/utility.c
@@ -456,6 +456,11 @@ int __cpufreq_set_policy(struct cpufreq_policy *data,
data->min = policy->min;
data->max = policy->max;
+ data->min_perf_pct = policy->min_perf_pct;
+ data->max_perf_pct = policy->max_perf_pct;
+
+ if (cpufreq_driver->setpolicy)
+ return cpufreq_driver->setpolicy(data);
if (policy->governor != data->governor) {
/* save old, working values */
diff --git a/xen/include/acpi/cpufreq/cpufreq.h
b/xen/include/acpi/cpufreq/cpufreq.h
index f96c3e4..67c9be2 100644
--- a/xen/include/acpi/cpufreq/cpufreq.h
+++ b/xen/include/acpi/cpufreq/cpufreq.h
@@ -52,6 +52,10 @@ struct cpufreq_policy {
unsigned int max; /* in kHz */
unsigned int cur; /* in kHz, only needed if cpufreq
* governors are used */
+ int min_perf_pct; /* min performance in percentage */
+ int max_perf_pct; /* max performance in percentage */
+ int turbo_pct;
+ unsigned int policy;
struct cpufreq_governor *governor;
bool_t resume; /* flag for cpufreq 1st run
@@ -87,6 +91,12 @@ struct cpufreq_freqs {
* CPUFREQ GOVERNORS *
*********************************************************************/
+/* the four internal governors used in intel_pstate */
+#define CPUFREQ_POLICY_POWERSAVE (1)
+#define CPUFREQ_POLICY_PERFORMANCE (2)
+#define CPUFREQ_POLICY_USERSPACE (3)
+#define CPUFREQ_POLICY_ONDEMAND (4)
+
#define CPUFREQ_GOV_START 1
#define CPUFREQ_GOV_STOP 2
#define CPUFREQ_GOV_LIMITS 3
@@ -145,6 +155,7 @@ struct cpufreq_driver {
char name[CPUFREQ_NAME_LEN];
int (*init)(struct cpufreq_policy *policy);
int (*verify)(struct cpufreq_policy *policy);
+ int (*setpolicy)(struct cpufreq_policy *policy);
int (*update)(int cpuid, struct cpufreq_policy *policy);
int (*target)(struct cpufreq_policy *policy,
unsigned int target_freq,
--
1.9.1
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