cpufreq cmdline handling

c/s 19147 adjust cpufreq cmdline handling, this patch is a complement to c/s 19147.
In this patch,
1. add common para (governor independent para) handling;
2. change governor dependent para handling method, governor dependent para will only be handled by the handler of that governor (not by all governors);
3. add userspace governor dependent para handling;
4. change para name 'threshold' of ondemand governor to 'up_threshold' since ondemand has only 'up_threshold', and conservative governor (will be implemented later) has both 'up_threshold' and 'down_threshold';
5. change some coding style (c/s 19147, drivers/cpufreq/cpufreq.c) to keep coordination with original drivers/cpufreq/cpufreq.c coding style; (originally this file is ported from linux, we partly use linux coding style)

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>

diff -r de853e901b5c xen/drivers/cpufreq/cpufreq.c
--- a/xen/drivers/cpufreq/cpufreq.c	Wed Feb 04 15:29:51 2009 +0000
+++ b/xen/drivers/cpufreq/cpufreq.c	Sun Feb 08 13:07:45 2009 +0800
@@ -45,6 +45,9 @@
 #include <asm/percpu.h>
 #include <acpi/acpi.h>
 #include <acpi/cpufreq/cpufreq.h>
+
+static unsigned int usr_max_freq, usr_min_freq;
+static void cpufreq_cmdline_common_para(struct cpufreq_policy *new_policy);
 
 struct cpufreq_dom {
     unsigned int	dom;
@@ -214,6 +217,9 @@ int cpufreq_add_cpu(unsigned int cpu)
         perf->domain_info.num_processors) {
         memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
         policy->governor = NULL;
+
+        cpufreq_cmdline_common_para(&new_policy);
+
         ret = __cpufreq_set_policy(policy, &new_policy);
         if (ret) {
             if (new_policy.governor == CPUFREQ_DEFAULT_GOVERNOR)
@@ -468,47 +474,71 @@ out:
     return ret;
 }
 
+static void cpufreq_cmdline_common_para(struct cpufreq_policy *new_policy)
+{
+    if (usr_max_freq)
+        new_policy->max = usr_max_freq;
+    if (usr_min_freq)
+        new_policy->min = usr_min_freq;
+}
+
+static int __init cpufreq_handle_common_option(const char *name, const char *val)
+{
+    if (!strcmp(name, "maxfreq") && val) {
+        usr_max_freq = simple_strtoul(val, NULL, 0);
+        return 1;
+    }
+
+    if (!strcmp(name, "minfreq") && val) {
+        usr_min_freq = simple_strtoul(val, NULL, 0);
+        return 1;
+    }
+
+    return 0;
+}
+
 void __init cpufreq_cmdline_parse(char *str)
 {
     static struct cpufreq_governor *__initdata cpufreq_governors[] =
     {
+        #define CPUFREQ_DEFAULT_GOVERNOR_INDEX 0;
         &cpufreq_gov_userspace,
         &cpufreq_gov_dbs,
         &cpufreq_gov_performance,
         &cpufreq_gov_powersave
     };
+    unsigned int gov_index = CPUFREQ_DEFAULT_GOVERNOR_INDEX;
 
     do {
         char *val, *end = strchr(str, ',');
         unsigned int i;
 
-        if ( end )
+        if (end)
             *end++ = '\0';
         val = strchr(str, '=');
-        if ( val )
+        if (val)
             *val++ = '\0';
 
-        if ( !cpufreq_opt_governor )
-        {
-            if ( !val )
-            {
-                for ( i = 0; i < ARRAY_SIZE(cpufreq_governors); ++i )
-                    if ( !strcmp(str, cpufreq_governors[i]->name) )
-                    {
+        if (!cpufreq_opt_governor) {
+            if (!val)
+                for (i = 0; i < ARRAY_SIZE(cpufreq_governors); ++i)
+                    if (!strcmp(str, cpufreq_governors[i]->name)) {
                         cpufreq_opt_governor = cpufreq_governors[i];
+                        gov_index = i;
                         str = NULL;
                         break;
                     }
-            }
             else
                 cpufreq_opt_governor = CPUFREQ_DEFAULT_GOVERNOR;
         }
 
-        if ( str )
-            for ( i = 0; i < ARRAY_SIZE(cpufreq_governors); ++i )
-                if ( cpufreq_governors[i]->handle_option )
-                    cpufreq_governors[i]->handle_option(str, val);
+        if (str) {
+            if (cpufreq_handle_common_option(str, val))
+                ;
+            else if (cpufreq_governors[gov_index]->handle_option)
+                cpufreq_governors[gov_index]->handle_option(str, val);
+        }
 
         str = end;
-    } while ( str );
+    } while (str);
 }
diff -r de853e901b5c xen/drivers/cpufreq/cpufreq_misc_governors.c
--- a/xen/drivers/cpufreq/cpufreq_misc_governors.c	Wed Feb 04 15:29:51 2009 +0000
+++ b/xen/drivers/cpufreq/cpufreq_misc_governors.c	Sun Feb 08 13:07:45 2009 +0800
@@ -18,6 +18,7 @@
 #include <xen/sched.h>
 #include <acpi/cpufreq/cpufreq.h>
 
+static unsigned int usr_speed;
 
 /*
  * cpufreq userspace governor
@@ -26,6 +27,7 @@ static int cpufreq_governor_userspace(st
                                       unsigned int event)
 {
     int ret = 0;
+    unsigned int freq;
 
     if (!policy)
         return -EINVAL;
@@ -35,12 +37,17 @@ static int cpufreq_governor_userspace(st
     case CPUFREQ_GOV_STOP:
         break;
     case CPUFREQ_GOV_LIMITS:
-        if (policy->max < policy->cur)
+        freq = usr_speed ? : policy->cur;
+        if (policy->max < freq)
             ret = __cpufreq_driver_target(policy, policy->max,
                         CPUFREQ_RELATION_H);
-        else if (policy->min > policy->cur)
+        else if (policy->min > freq)
             ret = __cpufreq_driver_target(policy, policy->min,
                         CPUFREQ_RELATION_L);
+        else if (usr_speed)
+            ret = __cpufreq_driver_target(policy, freq,
+                        CPUFREQ_RELATION_L);
+
         break;
     default:
         ret = -EINVAL;
@@ -50,9 +57,17 @@ static int cpufreq_governor_userspace(st
     return ret;
 }
 
+static void __init 
+cpufreq_userspace_handle_option(const char *name, const char *val)
+{
+    if (!strcmp(name, "speed") && val)
+        usr_speed = simple_strtoul(val, NULL, 0);
+}
+
 struct cpufreq_governor cpufreq_gov_userspace = {
     .name = "userspace",
     .governor = cpufreq_governor_userspace,
+    .handle_option = cpufreq_userspace_handle_option
 };
 
 static int __init cpufreq_gov_userspace_init(void)
diff -r de853e901b5c xen/drivers/cpufreq/cpufreq_ondemand.c
--- a/xen/drivers/cpufreq/cpufreq_ondemand.c	Wed Feb 04 15:29:51 2009 +0000
+++ b/xen/drivers/cpufreq/cpufreq_ondemand.c	Sun Feb 08 13:07:45 2009 +0800
@@ -287,7 +287,7 @@ static void __init cpufreq_dbs_handle_op
     {
         usr_sampling_rate = simple_strtoull(val, NULL, 0) * MICROSECS(1);
     }
-    else if ( !strcmp(name, "threshold") && val )
+    else if ( !strcmp(name, "up_threshold") && val )
     {
         unsigned long tmp = simple_strtoul(val, NULL, 0);