[PATCH v6 6/6] tools: enable xenpm to control the intel_pstate driver

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

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.
The "get-cpufreq-para" is modified to show percentage
based feedback info.
Also, some changes in identation are made to make the printed
info looks tidy.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
---
 changes in v6:
 No big change in this version, since we did not get any comments from the maintainers
 in the previous version.

 tools/misc/xenpm.c | 116 +++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 94 insertions(+), 22 deletions(-)

diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index 5944fdb..5644817 100644
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -32,6 +32,11 @@
 #define MAX_CORE_RESIDENCIES 8
 
 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
+#define min_t(type,x,y) \
+        ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
+#define max_t(type,x,y) \
+        ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
+#define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi)
 
 static xc_interface *xc_handle;
 static unsigned int max_cpu_nr;
@@ -46,6 +51,9 @@ 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"
@@ -59,10 +67,10 @@ 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"
@@ -677,37 +685,51 @@ 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_perf,
-           p_cpufreq->scaling_min_perf,
-           p_cpufreq->scaling_cur_freq);
+    switch ( p_cpufreq->perf_alias )
+    {
+    case PERCENTAGE:
+        printf("max_perf_pct         : %d\n", p_cpufreq->scaling_max_perf);
+        printf("min_perf_pct         : %d\n", p_cpufreq->scaling_min_perf);
+        printf("turbo_pct            : %d\n", p_cpufreq->scaling_turbo_pct);
+        break;
+    case FREQUENCY:
+    default:
+        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_perf,
+               p_cpufreq->scaling_min_perf,
+               p_cpufreq->scaling_cur_freq);
+        break;
+    }
 
     printf("turbo mode           : %s\n",
            p_cpufreq->turbo_enabled ? "enabled" : "disabled or n/a");
@@ -854,6 +876,54 @@ 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");
+    pct = clamp_t(int, pct, 0, 100);
+
+    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");
+    pct = clamp_t(int, pct, 0, 100);
+
+    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;
@@ -1133,6 +1203,8 @@ 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