[Xen-devel] [PATCH v3 03/11] x86/intel_pstate: add new policy fields and a new driver interface

[Wei Wang <wei.w.wang@xxxxxxxxx>]

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.

The perf_limts struct is included in the per-CPU policy struct, so
that each CPU can be managed individually by the xenpm tool.

Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
---
 xen/drivers/cpufreq/utility.c      |  6 ++++++
 xen/include/acpi/cpufreq/cpufreq.h | 15 +++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/xen/drivers/cpufreq/utility.c b/xen/drivers/cpufreq/utility.c
index 519f862..b3fe3c0 100644
--- a/xen/drivers/cpufreq/utility.c
+++ b/xen/drivers/cpufreq/utility.c
@@ -457,6 +457,12 @@ int __cpufreq_set_policy(struct cpufreq_policy *data,
     data->min = policy->min;
     data->max = policy->max;
 
+    if (cpufreq_driver->setpolicy) {
+        data->limits.min_perf_pct = policy->limits.min_perf_pct;
+        data->limits.max_perf_pct = policy->limits.max_perf_pct;
+        return cpufreq_driver->setpolicy(data);
+    }
+
     if (policy->governor != data->governor) {
         /* save old, working values */
         struct cpufreq_governor *old_gov = data->governor;
diff --git a/xen/include/acpi/cpufreq/cpufreq.h 
b/xen/include/acpi/cpufreq/cpufreq.h
index f96c3e4..60caf59 100644
--- a/xen/include/acpi/cpufreq/cpufreq.h
+++ b/xen/include/acpi/cpufreq/cpufreq.h
@@ -41,6 +41,18 @@ struct cpufreq_cpuinfo {
     unsigned int        transition_latency; /* in 10^(-9) s = nanoseconds */
 };
 
+struct perf_limits {
+    int no_turbo;
+    int turbo_disabled;
+    uint32_t turbo_pct;
+    uint32_t max_perf_pct; /* max performance in percentage */
+    uint32_t min_perf_pct; /* min performance in percentage */
+    uint32_t max_perf;
+    uint32_t min_perf;
+    uint32_t max_policy_pct;
+    uint32_t min_policy_pct;
+};
+
 struct cpufreq_policy {
     cpumask_var_t       cpus;          /* affected CPUs */
     unsigned int        shared_type;   /* ANY or ALL affected CPUs
@@ -52,6 +64,8 @@ struct cpufreq_policy {
     unsigned int        max;    /* in kHz */
     unsigned int        cur;    /* in kHz, only needed if cpufreq
                                  * governors are used */
+    unsigned int        policy;
+    struct perf_limits  limits;
     struct cpufreq_governor     *governor;
 
     bool_t              resume; /* flag for cpufreq 1st run
@@ -145,6 +159,7 @@ 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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