[Xen-devel] [PATCH v3 3/3] xenpm: Allow controlling the max C-state sub-state

[Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>]

Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
CC: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
CC: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 tools/misc/xenpm.c | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index e43924c..9b52b00 100644
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -64,6 +64,7 @@ void show_help(void)
             " 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-csubstate     <num>         set the C-State sub-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"
@@ -188,7 +189,19 @@ static int show_max_cstate(xc_interface *xc_handle)
     if ( (ret = xc_get_cpuidle_max_cstate(xc_handle, &value)) )
         return ret;
 
-    printf("Max possible C-state: C%d\n\n", value);
+    printf("Max possible C-state: C%d\n", value);
+    return 0;
+}
+
+static int show_max_csubstate(xc_interface *xc_handle)
+{
+    int ret = 0;
+    uint32_t value;
+
+    if ( (ret = xc_get_cpuidle_max_csubstate(xc_handle, &value)) )
+        return ret;
+
+    printf("Max possible C-state sub-state: %u\n\n", value);
     return 0;
 }
 
@@ -223,6 +236,7 @@ void cxstat_func(int argc, char *argv[])
         parse_cpuid(argv[0], &cpuid);
 
     show_max_cstate(xc_handle);
+    show_max_csubstate(xc_handle);
 
     if ( cpuid < 0 )
     {
@@ -1088,6 +1102,23 @@ void set_max_cstate_func(int argc, char *argv[])
                 value, errno, strerror(errno));
 }
 
+void set_max_csubstate_func(int argc, char *argv[])
+{
+    uint32_t value;
+
+    if ( argc != 1 || sscanf(argv[0], "%u", &value) != 1 )
+    {
+        fprintf(stderr, "Missing or invalid argument(s)\n");
+        exit(EINVAL);
+    }
+
+    if ( !xc_set_cpuidle_max_csubstate(xc_handle, value) )
+        printf("set max_csubstate to %u succeeded\n", value);
+    else
+        fprintf(stderr, "set max_csubstate to %u failed (%d - %s)\n",
+                value, errno, strerror(errno));
+}
+
 void enable_turbo_mode(int argc, char *argv[])
 {
     int cpuid = -1;
@@ -1154,6 +1185,7 @@ struct {
     { "get-vcpu-migration-delay", get_vcpu_migration_delay_func},
     { "set-vcpu-migration-delay", set_vcpu_migration_delay_func},
     { "set-max-cstate", set_max_cstate_func},
+    { "set-max-csubstate", set_max_csubstate_func},
     { "enable-turbo-mode", enable_turbo_mode },
     { "disable-turbo-mode", disable_turbo_mode },
 };
-- 
1.9.3


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