[PATCH v6 2/6] x86/intel_pstate: introduce the internal_governor struct

[Wei Wang <wei.w.wang@intel.com>]

Introduce a simple internal_governor struct to manage internal
governor related variables. Also, add a condition check in
cpufreq_del_cpu to avoid going through the old ACPI governor
framework when an internal governor is in use.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
---
 changes in v6:
 1) create this patch by spliting it from the next big one.

 xen/drivers/cpufreq/cpufreq.c      | 5 +++--
 xen/include/acpi/cpufreq/cpufreq.h | 7 +++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/cpufreq/cpufreq.c b/xen/drivers/cpufreq/cpufreq.c
index 6e666e4..2c1c713 100644
--- a/xen/drivers/cpufreq/cpufreq.c
+++ b/xen/drivers/cpufreq/cpufreq.c
@@ -334,8 +334,9 @@ int cpufreq_del_cpu(unsigned int cpu)
 
     /* for HW_ALL, stop gov for each core of the _PSD domain */
     /* for SW_ALL & SW_ANY, stop gov for the 1st core of the _PSD domain */
-    if (hw_all || (cpumask_weight(cpufreq_dom->map) ==
-                   perf->domain_info.num_processors))
+    if (!policy->internal_gov &&
+        (hw_all || (cpumask_weight(cpufreq_dom->map) ==
+                    perf->domain_info.num_processors)))
         __cpufreq_governor(policy, CPUFREQ_GOV_STOP);
 
     cpufreq_statistic_exit(cpu);
diff --git a/xen/include/acpi/cpufreq/cpufreq.h b/xen/include/acpi/cpufreq/cpufreq.h
index 48ad1d0..8947368 100644
--- a/xen/include/acpi/cpufreq/cpufreq.h
+++ b/xen/include/acpi/cpufreq/cpufreq.h
@@ -53,6 +53,12 @@ struct perf_limits {
     uint32_t min_policy_pct;
 };
 
+struct internal_governor {
+    char *avail_gov;
+    uint32_t gov_num;
+    uint32_t cur_gov;
+};
+
 struct cpufreq_policy {
     cpumask_var_t       cpus;          /* affected CPUs */
     unsigned int        shared_type;   /* ANY or ALL affected CPUs
@@ -66,6 +72,7 @@ struct cpufreq_policy {
                                  * governors are used */
     struct perf_limits  limits;
     struct cpufreq_governor     *governor;
+    struct internal_governor    *internal_gov;
 
     bool_t              resume; /* flag for cpufreq 1st run
                                  * S3 wakeup, hotplug cpu, etc */
-- 
1.9.1