[Xen-changelog] [xen master] x86/cpufreq: add a new driver interface, setpolicy()

[patchbot@xxxxxxx]

commit 7b82467fe7d2a2c8a7d1280414ff2c996160a3fb
Author:     Wei Wang <wei.w.wang@xxxxxxxxx>
AuthorDate: Tue Oct 6 17:37:48 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 6 17:37:48 2015 +0200

    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@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/drivers/cpufreq/utility.c      |    3 +++
 xen/include/acpi/cpufreq/cpufreq.h |   14 ++++++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/xen/drivers/cpufreq/utility.c b/xen/drivers/cpufreq/utility.c
index 519f862..53879fe 100644
--- 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 f96c3e4..1ec04ca 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 {
+    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,
--
generated by git-patchbot for /home/xen/git/xen.git#master

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