X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Facpi%2Fprocessor_throttling.c;h=1685b40abda7c2dba944939917a4993f8a4a5f3d;hb=444ad82bc3eaa554be40d22dc248e58aeefd54d9;hp=f4b5f7d5dbe631ce57cbaa582afd79fd5ae5d107;hpb=9bcb27217344c2c1389db3983a436e19484c2f50;p=linux-2.6

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index f4b5f7d5db..1685b40abd 100644
--- 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)
@@ -689,12 +775,12 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
 		acpi_processor_get_throttling_states(pr) ||
 		acpi_processor_get_platform_limit(pr))
 	{
-		if (acpi_processor_get_fadt_info(pr))
-			return 0;
 		pr->throttling.acpi_processor_get_throttling =
 		    &acpi_processor_get_throttling_fadt;
 		pr->throttling.acpi_processor_set_throttling =
 		    &acpi_processor_set_throttling_fadt;
+		if (acpi_processor_get_fadt_info(pr))
+			return 0;
 	} else {
 		pr->throttling.acpi_processor_get_throttling =
 		    &acpi_processor_get_throttling_ptc;