x86/cpufreq: add a new driver interface, setpolicy()

In order to better support future Intel processors, intel_pstate
changes to use percentage values to tune P-states. 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.wang@intel.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

diff --git a/xen/drivers/cpufreq/utility.c b/xen/drivers/cpufreq/utility.c
index 519f862182e665058c0284b85ec96603bd1ebd1c..53879fe8ddb122b048c51459693378c6d88be690 100644 (file)
--- a/xen/drivers/cpufreq/utility.c
+++ b/xen/drivers/cpufreq/utility.c
@@ -456,6 +456,9 @@ int __cpufreq_set_policy(struct cpufreq_policy *data,
 
     data->min = policy->min;
     data->max = policy->max;
+    data->limits = policy->limits;
+    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 f96c3e4ccf2aaf46889a9774d76deed2d93d4783..1ec04ca2bdfe5dc80022fa9accb5a828690ef827 100644 (file)
--- 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 {
+    bool_t no_turbo;
+    bool_t 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 +64,7 @@ struct cpufreq_policy {
     unsigned int        max;    /* in kHz */
     unsigned int        cur;    /* in kHz, only needed if cpufreq
                                  * governors are used */
+    struct perf_limits  limits;
     struct cpufreq_governor     *governor;
 
     bool_t              resume; /* flag for cpufreq 1st run
@@ -145,6 +158,7 @@ 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,