ACPI: SBS: Ignore alarms coming from unknown devices

[safe/jmp/linux-2.6] / drivers / acpi / processor_throttling.c

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index f4b5f7d..6742d7b 100644 (file)
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -29,6 +29,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/sched.h>
 #include <linux/cpufreq.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
@@ -393,6 +394,74 @@ static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
        return 0;
 }
 
+#ifdef CONFIG_X86
+static int acpi_throttling_rdmsr(struct acpi_processor *pr,
+                                       acpi_integer * value)
+{
+       struct cpuinfo_x86 *c;
+       u64 msr_high, msr_low;
+       unsigned int cpu;
+       u64 msr = 0;
+       int ret = -1;
+
+       cpu = pr->id;
+       c = &cpu_data(cpu);
+
+       if ((c->x86_vendor != X86_VENDOR_INTEL) ||
+               !cpu_has(c, X86_FEATURE_ACPI)) {
+               printk(KERN_ERR PREFIX
+                       "HARDWARE addr space,NOT supported yet\n");
+       } else {
+               msr_low = 0;
+               msr_high = 0;
+               rdmsr_safe(MSR_IA32_THERM_CONTROL,
+                       (u32 *)&msr_low , (u32 *) &msr_high);
+               msr = (msr_high << 32) | msr_low;
+               *value = (acpi_integer) msr;
+               ret = 0;
+       }
+       return ret;
+}
+
+static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
+{
+       struct cpuinfo_x86 *c;
+       unsigned int cpu;
+       int ret = -1;
+       u64 msr;
+
+       cpu = pr->id;
+       c = &cpu_data(cpu);
+
+       if ((c->x86_vendor != X86_VENDOR_INTEL) ||
+               !cpu_has(c, X86_FEATURE_ACPI)) {
+               printk(KERN_ERR PREFIX
+                       "HARDWARE addr space,NOT supported yet\n");
+       } else {
+               msr = value;
+               wrmsr_safe(MSR_IA32_THERM_CONTROL,
+                       msr & 0xffffffff, msr >> 32);
+               ret = 0;
+       }
+       return ret;
+}
+#else
+static int acpi_throttling_rdmsr(struct acpi_processor *pr,
+                               acpi_integer * value)
+{
+       printk(KERN_ERR PREFIX
+               "HARDWARE addr space,NOT supported yet\n");
+       return -1;
+}
+
+static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
+{
+       printk(KERN_ERR PREFIX
+               "HARDWARE addr space,NOT supported yet\n");
+       return -1;
+}
+#endif
+
 static int acpi_read_throttling_status(struct acpi_processor *pr,
                                        acpi_integer *value)
 {
@@ -417,8 +486,7 @@ static int acpi_read_throttling_status(struct acpi_processor *pr,
                ret = 0;
                break;
        case ACPI_ADR_SPACE_FIXED_HARDWARE:
-               printk(KERN_ERR PREFIX
-                      "HARDWARE addr space,NOT supported yet\n");
+               ret = acpi_throttling_rdmsr(pr, value);
                break;
        default:
                printk(KERN_ERR PREFIX "Unknown addr space %d\n",
@@ -451,8 +519,7 @@ static int acpi_write_throttling_state(struct acpi_processor *pr,
                ret = 0;
                break;
        case ACPI_ADR_SPACE_FIXED_HARDWARE:
-               printk(KERN_ERR PREFIX
-                      "HARDWARE addr space,NOT supported yet\n");
+               ret = acpi_throttling_wrmsr(pr, value);
                break;
        default:
                printk(KERN_ERR PREFIX "Unknown addr space %d\n",
@@ -506,21 +573,32 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
                return -ENODEV;
 
        pr->throttling.state = 0;
-       local_irq_disable();
+
        value = 0;
        ret = acpi_read_throttling_status(pr, &value);
        if (ret >= 0) {
                state = acpi_get_throttling_state(pr, value);
                pr->throttling.state = state;
        }
-       local_irq_enable();
 
        return 0;
 }
 
 static int acpi_processor_get_throttling(struct acpi_processor *pr)
 {
-       return pr->throttling.acpi_processor_get_throttling(pr);
+       cpumask_t saved_mask;
+       int ret;
+
+       /*
+        * Migrate task to the cpu pointed by pr.
+        */
+       saved_mask = current->cpus_allowed;
+       set_cpus_allowed(current, cpumask_of_cpu(pr->id));
+       ret = pr->throttling.acpi_processor_get_throttling(pr);
+       /* restore the previous state */
+       set_cpus_allowed(current, saved_mask);
+
+       return ret;
 }
 
 static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
@@ -651,21 +729,29 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
        if (state < pr->throttling_platform_limit)
                return -EPERM;
 
-       local_irq_disable();
        value = 0;
        ret = acpi_get_throttling_value(pr, state, &value);
        if (ret >= 0) {
                acpi_write_throttling_state(pr, value);
                pr->throttling.state = state;
        }
-       local_irq_enable();
 
        return 0;
 }
 
 int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
 {
-       return pr->throttling.acpi_processor_set_throttling(pr, state);
+       cpumask_t saved_mask;
+       int ret;
+       /*
+        * Migrate task to the cpu pointed by pr.
+        */
+       saved_mask = current->cpus_allowed;
+       set_cpus_allowed(current, cpumask_of_cpu(pr->id));
+       ret = pr->throttling.acpi_processor_set_throttling(pr, state);
+       /* restore the previous state */
+       set_cpus_allowed(current, saved_mask);
+       return ret;
 }
 
 int acpi_processor_get_throttling_info(struct acpi_processor *pr)