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[Xen-devel] [PATCH v2 9/9] x86/intel_pstate: enable xenpm to control the intel_pstate driver



The intel_pstate driver receives percentage values to set the
performance limits. This patch adds interfaces to support the
input of percentage values to control the intel_pstate driver.
Also, the "get-cpufreq-para" is modified to show percentage
based feedback info.

Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
---
 tools/libxc/include/xenctrl.h |  14 +++++-
 tools/libxc/xc_pm.c           |  17 ++++---
 tools/misc/xenpm.c            | 104 ++++++++++++++++++++++++++++++++----------
 3 files changed, 103 insertions(+), 32 deletions(-)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 02d0db8..5929311 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -2216,8 +2216,18 @@ struct xc_get_cpufreq_para {
     uint32_t scaling_cur_freq;
 
     char scaling_governor[CPUFREQ_NAME_LEN];
-    uint32_t scaling_max_freq;
-    uint32_t scaling_min_freq;
+
+    union {
+        uint32_t max_freq;
+        int32_t  max_perf_pct;
+    } scaling_max;
+
+    union {
+        uint32_t min_freq;
+        int32_t  min_perf_pct;
+    } scaling_min;
+
+    int32_t scaling_turbo_pct;
 
     /* for specific governor */
     union {
diff --git a/tools/libxc/xc_pm.c b/tools/libxc/xc_pm.c
index c49d1c0..df3421a 100644
--- a/tools/libxc/xc_pm.c
+++ b/tools/libxc/xc_pm.c
@@ -261,13 +261,16 @@ int xc_get_cpufreq_para(xc_interface *xch, int cpuid,
     }
     else
     {
-        user_para->cpuinfo_cur_freq = sys_para->cpuinfo_cur_freq;
-        user_para->cpuinfo_max_freq = sys_para->cpuinfo_max_freq;
-        user_para->cpuinfo_min_freq = sys_para->cpuinfo_min_freq;
-        user_para->scaling_cur_freq = sys_para->scaling_cur_freq;
-        user_para->scaling_max_freq = sys_para->scaling_max.max_freq;
-        user_para->scaling_min_freq = sys_para->scaling_min.min_freq;
-        user_para->turbo_enabled    = sys_para->turbo_enabled;
+        user_para->cpuinfo_cur_freq             = sys_para->cpuinfo_cur_freq;
+        user_para->cpuinfo_max_freq             = sys_para->cpuinfo_max_freq;
+        user_para->cpuinfo_min_freq             = sys_para->cpuinfo_min_freq;
+        user_para->scaling_cur_freq             = sys_para->scaling_cur_freq;
+        user_para->scaling_max.max_freq         = 
sys_para->scaling_max.max_freq;
+        user_para->scaling_min.min_freq         = 
sys_para->scaling_min.min_freq;
+        user_para->scaling_max.max_perf_pct     = 
sys_para->scaling_max.max_perf_pct;
+        user_para->scaling_min.min_perf_pct     = 
sys_para->scaling_min.min_perf_pct;
+        user_para->scaling_turbo_pct            = sys_para->scaling_turbo_pct;
+        user_para->turbo_enabled                = sys_para->turbo_enabled;
 
         memcpy(user_para->scaling_driver,
                 sys_para->scaling_driver, CPUFREQ_NAME_LEN);
diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index a5d07de..0a86362 100644
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -47,6 +47,9 @@ void show_help(void)
             " get-cpuidle-states    [cpuid]       list cpu idle info of CPU 
<cpuid> or all\n"
             " get-cpufreq-states    [cpuid]       list cpu freq info of CPU 
<cpuid> or all\n"
             " get-cpufreq-para      [cpuid]       list cpu freq parameter of 
CPU <cpuid> or all\n"
+            " set-scaling-max-pct   [cpuid] <num> set max performance limit in 
percentage\n"
+            "                                     or as scaling speed in 
percentage in userspace governor\n"
+            " set-scaling-min-pct   [cpuid] <num> set min performance limit in 
percentage\n"
             " set-scaling-maxfreq   [cpuid] <HZ>  set max cpu frequency <HZ> 
on CPU <cpuid>\n"
             "                                     or all CPUs\n"
             " set-scaling-minfreq   [cpuid] <HZ>  set min cpu frequency <HZ> 
on CPU <cpuid>\n"
@@ -60,10 +63,10 @@ void show_help(void)
             " set-up-threshold      [cpuid] <num> set up threshold on CPU 
<cpuid> or all\n"
             "                                     it is used in ondemand 
governor.\n"
             " get-cpu-topology                    get thread/core/socket 
topology info\n"
-            " set-sched-smt           enable|disable enable/disable scheduler 
smt power saving\n"
+            " set-sched-smt                       enable|disable 
enable/disable scheduler smt power saving\n"
             " set-vcpu-migration-delay      <num> set scheduler vcpu migration 
delay in us\n"
             " get-vcpu-migration-delay            get scheduler vcpu migration 
delay\n"
-            " set-max-cstate        <num>         set the C-State limitation 
(<num> >= 0)\n"
+            " set-max-cstate                <num> set the C-State limitation 
(<num> >= 0)\n"
             " start [seconds]                     start collect Cx/Px 
statistics,\n"
             "                                     output after CTRL-C or 
SIGINT or several seconds.\n"
             " enable-turbo-mode     [cpuid]       enable Turbo Mode for 
processors that support it.\n"
@@ -683,38 +686,47 @@ static void print_cpufreq_para(int cpuid, struct 
xc_get_cpufreq_para *p_cpufreq)
 
     printf("current_governor     : %s\n", p_cpufreq->scaling_governor);
     if ( !strncmp(p_cpufreq->scaling_governor,
-                  "userspace", CPUFREQ_NAME_LEN) )
+              "userspace", CPUFREQ_NAME_LEN) &&
+          strncmp(p_cpufreq->scaling_driver,
+              "intel_pstate", CPUFREQ_NAME_LEN) )
     {
-        printf("  userspace specific :\n");
-        printf("    scaling_setspeed : %u\n",
+        printf("userspace specific   :\n");
+        printf("scaling_setspeed     : %u\n",
                p_cpufreq->u.userspace.scaling_setspeed);
     }
     else if ( !strncmp(p_cpufreq->scaling_governor,
-                       "ondemand", CPUFREQ_NAME_LEN) )
+                   "ondemand", CPUFREQ_NAME_LEN) &&
+               strncmp(p_cpufreq->scaling_driver,
+                   "intel_pstate", CPUFREQ_NAME_LEN) )
     {
-        printf("  ondemand specific  :\n");
-        printf("    sampling_rate    : max [%u] min [%u] cur [%u]\n",
+        printf("ondemand specific    :\n");
+        printf("sampling_rate        : max [%u] min [%u] cur [%u]\n",
                p_cpufreq->u.ondemand.sampling_rate_max,
                p_cpufreq->u.ondemand.sampling_rate_min,
                p_cpufreq->u.ondemand.sampling_rate);
-        printf("    up_threshold     : %u\n",
+        printf("up_threshold         : %u\n",
                p_cpufreq->u.ondemand.up_threshold);
     }
 
-    printf("scaling_avail_freq   :");
-    for ( i = 0; i < p_cpufreq->freq_num; i++ )
-        if ( p_cpufreq->scaling_available_frequencies[i] ==
-             p_cpufreq->scaling_cur_freq )
-            printf(" *%d", p_cpufreq->scaling_available_frequencies[i]);
-        else
-            printf(" %d", p_cpufreq->scaling_available_frequencies[i]);
-    printf("\n");
-
-    printf("scaling frequency    : max [%u] min [%u] cur [%u]\n",
-           p_cpufreq->scaling_max_freq,
-           p_cpufreq->scaling_min_freq,
-           p_cpufreq->scaling_cur_freq);
-
+    if (!strncmp(p_cpufreq->scaling_driver,
+                  "intel_pstate", CPUFREQ_NAME_LEN) ) {
+        printf("max_perf_pct         : %d\n", 
p_cpufreq->scaling_max.max_perf_pct);
+        printf("min_perf_pct         : %d\n", 
p_cpufreq->scaling_min.min_perf_pct);
+        printf("turbo_pct            : %d\n", p_cpufreq->scaling_turbo_pct);
+    } else {
+        printf("scaling_avail_freq   :");
+        for ( i = 0; i < p_cpufreq->freq_num; i++ )
+            if ( p_cpufreq->scaling_available_frequencies[i] ==
+                 p_cpufreq->scaling_cur_freq )
+                printf(" *%d", p_cpufreq->scaling_available_frequencies[i]);
+            else
+                printf(" %d", p_cpufreq->scaling_available_frequencies[i]);
+        printf("\n");
+        printf("scaling frequency    : max [%u] min [%u] cur [%u]\n",
+               p_cpufreq->scaling_max.max_freq,
+               p_cpufreq->scaling_min.min_freq,
+               p_cpufreq->scaling_cur_freq);
+   }
     printf("turbo mode           : %s\n",
            p_cpufreq->turbo_enabled ? "enabled" : "disabled or n/a");
     printf("\n");
@@ -860,6 +872,50 @@ void scaling_min_freq_func(int argc, char *argv[])
     }
 }
 
+void scaling_max_pct_func(int argc, char *argv[]) {
+    int cpuid = -1, pct = -1;
+
+    parse_cpuid_and_int(argc, argv, &cpuid, &pct, "percentage");
+
+    if ( cpuid < 0 )
+    {
+        int i;
+        for ( i = 0; i < max_cpu_nr; i++ )
+            if ( xc_set_cpufreq_para(xc_handle, i, SCALING_MAX_PCT, pct) )
+                fprintf(stderr,
+                        "[CPU%d] failed to set scaling max freq (%d - %s)\n",
+                        i, errno, strerror(errno));
+    }
+    else
+    {
+        if ( xc_set_cpufreq_para(xc_handle, cpuid, SCALING_MAX_PCT, pct) )
+            fprintf(stderr, "failed to set scaling max freq (%d - %s)\n",
+                    errno, strerror(errno));
+    }
+}
+
+void scaling_min_pct_func(int argc, char *argv[]) {
+    int cpuid = -1, pct = -1;
+
+    parse_cpuid_and_int(argc, argv, &cpuid, &pct, "percentage");
+
+    if ( cpuid < 0 )
+    {
+        int i;
+        for ( i = 0; i < max_cpu_nr; i++ )
+            if ( xc_set_cpufreq_para(xc_handle, i, SCALING_MIN_PCT, pct) )
+                fprintf(stderr,
+                        "[CPU%d] failed to set scaling max pct (%d - %s)\n",
+                        i, errno, strerror(errno));
+    }
+    else
+    {
+        if ( xc_set_cpufreq_para(xc_handle, cpuid, SCALING_MIN_PCT, pct) )
+            fprintf(stderr, "failed to set scaling min pct (%d - %s)\n",
+                    errno, strerror(errno));
+    }
+}
+
 void scaling_speed_func(int argc, char *argv[])
 {
     int cpuid = -1, speed = -1;
@@ -1141,6 +1197,8 @@ struct {
     { "get-cpufreq-para", cpufreq_para_func },
     { "set-scaling-maxfreq", scaling_max_freq_func },
     { "set-scaling-minfreq", scaling_min_freq_func },
+    { "set-scaling-max-pct", scaling_max_pct_func},
+    { "set-scaling-min-pct", scaling_min_pct_func},
     { "set-scaling-governor", scaling_governor_func },
     { "set-scaling-speed", scaling_speed_func },
     { "set-sampling-rate", scaling_sampling_rate_func },
-- 
1.9.1


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