[PATCH v5 15/18] xen/cpufreq: bypass governor-related para for amd-cppc-epp

[Penny Zheng]

HWP and amd-cppc-epp are both governor-less driver,
so we introduce "hw_auto" flag to together bypass governor-related print in
print_cpufreq_para().

In get/set_cpufreq_para(), we are adding "cpufreq_driver.setpolicy == NULL"
check to exclude governor-related para for amd-cppc-epp driver.

Signed-off-by: Penny Zheng <penny.zh...@amd.com>
---
v3 -> v4:
- Include validation check fix here
---
v4 -> v5:
- validation check has beem moved to where XEN_PROCESSOR_PM_CPPC and
XEN_CPPC_INIT have been firstly introduced
- adding "cpufreq_driver.setpolicy == NULL" check to exclude governor-related
para for amd-cppc-epp driver in get/set_cpufreq_para()
---
 tools/misc/xenpm.c        | 10 +++++++---
 xen/drivers/acpi/pmstat.c |  6 ++++--
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index 2a87f7ae8a..f173e598ea 100644
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -791,9 +791,13 @@ static unsigned int calculate_activity_window(const 
xc_cppc_para_t *cppc,
 /* print out parameters about cpu frequency */
 static void print_cpufreq_para(int cpuid, struct xc_get_cpufreq_para 
*p_cpufreq)
 {
-    bool hwp = strcmp(p_cpufreq->scaling_driver, XEN_HWP_DRIVER_NAME) == 0;
+    bool hw_auto = false;
     int i;
 
+    if ( !strcmp(p_cpufreq->scaling_driver, XEN_HWP_DRIVER_NAME) ||
+         !strcmp(p_cpufreq->scaling_driver, XEN_AMD_CPPC_EPP_DRIVER_NAME) )
+        hw_auto = true;
+
     printf("cpu id               : %d\n", cpuid);
 
     printf("affected_cpus        :");
@@ -801,7 +805,7 @@ static void print_cpufreq_para(int cpuid, struct 
xc_get_cpufreq_para *p_cpufreq)
         printf(" %d", p_cpufreq->affected_cpus[i]);
     printf("\n");
 
-    if ( hwp )
+    if ( hw_auto )
         printf("cpuinfo frequency    : base [%"PRIu32"] max [%"PRIu32"]\n",
                p_cpufreq->cpuinfo_min_freq,
                p_cpufreq->cpuinfo_max_freq);
@@ -813,7 +817,7 @@ static void print_cpufreq_para(int cpuid, struct 
xc_get_cpufreq_para *p_cpufreq)
 
     printf("scaling_driver       : %s\n", p_cpufreq->scaling_driver);
 
-    if ( !hwp )
+    if ( !hw_auto )
     {
         if ( p_cpufreq->gov_num )
             printf("scaling_avail_gov    : %s\n",
diff --git a/xen/drivers/acpi/pmstat.c b/xen/drivers/acpi/pmstat.c
index 6e9178ade1..e5f375921a 100644
--- a/xen/drivers/acpi/pmstat.c
+++ b/xen/drivers/acpi/pmstat.c
@@ -253,7 +253,8 @@ static int get_cpufreq_para(struct xen_sysctl_pm_op *op)
     else
         strlcpy(op->u.get_para.scaling_driver, "Unknown", CPUFREQ_NAME_LEN);
 
-    if ( !hwp_active() )
+    /* bypass hwp and amd-cppc-epp driver */
+    if ( !hwp_active() && cpufreq_driver.setpolicy == NULL )
     {
         if ( !(scaling_available_governors =
                xzalloc_array(char, gov_num * CPUFREQ_NAME_LEN)) )
@@ -346,7 +347,8 @@ static int set_cpufreq_para(struct xen_sysctl_pm_op *op)
     if ( !policy || !policy->governor )
         return -EINVAL;
 
-    if ( hwp_active() )
+    /* bypass hwp and amd-cppc-epp driver */
+    if ( hwp_active() || cpufreq_driver.setpolicy == NULL )
         return -EOPNOTSUPP;
 
     switch(op->u.set_para.ctrl_type)
-- 
2.34.1