1 files changed, 72 insertions, 9 deletions

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 60e543d3234e..3a73a93596e8 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -30,6 +30,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/cpufreq.h>
+#include <linux/slab.h>
 
 #ifdef CONFIG_X86
 #include <asm/cpufeature.h>
@@ -39,6 +40,8 @@
 #include <acpi/acpi_drivers.h>
 #include <acpi/processor.h>
 
+#define PREFIX "ACPI: "
+
 #define ACPI_PROCESSOR_CLASS            "processor"
 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
@@ -150,21 +153,78 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
         return 0;
 }
 
-int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
+#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE       0x80
+/*
+ * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
+ * @handle: ACPI processor handle
+ * @status: the status code of _PPC evaluation
+ *      0: success. OSPM is now using the performance state specificed.
+ *      1: failure. OSPM has not changed the number of P-states in use
+ */
+static void acpi_processor_ppc_ost(acpi_handle handle, int status)
+{
+        union acpi_object params[2] = {
+                {.type = ACPI_TYPE_INTEGER,},
+                {.type = ACPI_TYPE_INTEGER,},
+        };
+        struct acpi_object_list arg_list = {2, params};
+        acpi_handle temp;
+
+        params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
+        params[1].integer.value =  status;
+
+        /* when there is no _OST , skip it */
+        if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
+                return;
+
+        acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
+        return;
+}
+
+int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
 {
         int ret;
 
-        if (ignore_ppc)
+        if (ignore_ppc) {
+                /*
+                 * Only when it is notification event, the _OST object
+                 * will be evaluated. Otherwise it is skipped.
+                 */
+                if (event_flag)
+                        acpi_processor_ppc_ost(pr->handle, 1);
                 return 0;
+        }
 
         ret = acpi_processor_get_platform_limit(pr);
-
+        /*
+         * Only when it is notification event, the _OST object
+         * will be evaluated. Otherwise it is skipped.
+         */
+        if (event_flag) {
+                if (ret < 0)
+                        acpi_processor_ppc_ost(pr->handle, 1);
+                else
+                        acpi_processor_ppc_ost(pr->handle, 0);
+        }
         if (ret < 0)
                 return (ret);
         else
                 return cpufreq_update_policy(pr->id);
 }
 
+int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
+{
+        struct acpi_processor *pr;
+
+        pr = per_cpu(processors, cpu);
+        if (!pr || !pr->performance || !pr->performance->state_count)
+                return -ENODEV;
+        *limit = pr->performance->states[pr->performance_platform_limit].
+                core_frequency * 1000;
+        return 0;
+}
+EXPORT_SYMBOL(acpi_processor_get_bios_limit);
+
 void acpi_processor_ppc_init(void)
 {
         if (!cpufreq_register_notifier
@@ -354,7 +414,11 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr)
         if (result)
                 goto update_bios;
 
-        return 0;
+        /* We need to call _PPC once when cpufreq starts */
+        if (ignore_ppc != 1)
+                result = acpi_processor_get_platform_limit(pr);
+
+        return result;
 
         /*
          * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
@@ -383,8 +447,8 @@ int acpi_processor_notify_smm(struct module *calling_module)
         if (!try_module_get(calling_module))
                 return -EINVAL;
 
-        /* is_done is set to negative if an error occured,
-         * and to postitive if _no_ error occured, but SMM
+        /* is_done is set to negative if an error occurred,
+         * and to postitive if _no_ error occurred, but SMM
          * was already notified. This avoids double notification
          * which might lead to unexpected results...
          */
@@ -498,7 +562,7 @@ end:
 }
 
 int acpi_processor_preregister_performance(
-                struct acpi_processor_performance *performance)
+                struct acpi_processor_performance __percpu *performance)
 {
         int count, count_target;
         int retval = 0;
@@ -509,7 +573,7 @@ int acpi_processor_preregister_performance(
         struct acpi_processor *match_pr;
         struct acpi_psd_package *match_pdomain;
 
-        if (!alloc_cpumask_var(&covered_cpus, GFP_KERNEL))
+        if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
                 return -ENOMEM;
 
         mutex_lock(&performance_mutex);
@@ -556,7 +620,6 @@ int acpi_processor_preregister_performance(
          * Now that we have _PSD data from all CPUs, lets setup P-state 
          * domain info.
          */
-        cpumask_clear(covered_cpus);
         for_each_possible_cpu(i) {
                 pr = per_cpu(processors, i);
                 if (!pr)