ACPI: Delete the IRQ operation in throttling controll via PTC

The IRQ operation(enable/disable) should be avoided when throttling is
controlled via PTC method. It is replaced by the migration of task.

This fixes an oops on T61 -- a regression due to
f79f06ab9f86 b/c FixedHW support tried to read remote MSR with interrupts disabled.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index c26c61f..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>
@@ -413,7 +414,7 @@ static int acpi_throttling_rdmsr(struct acpi_processor *pr,
        } else {
                msr_low = 0;
                msr_high = 0;
-               rdmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL,
+               rdmsr_safe(MSR_IA32_THERM_CONTROL,
                        (u32 *)&msr_low , (u32 *) &msr_high);
                msr = (msr_high << 32) | msr_low;
                *value = (acpi_integer) msr;
@@ -438,7 +439,7 @@ static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
                        "HARDWARE addr space,NOT supported yet\n");
        } else {
                msr = value;
-               wrmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL,
+               wrmsr_safe(MSR_IA32_THERM_CONTROL,
                        msr & 0xffffffff, msr >> 32);
                ret = 0;
        }
@@ -572,21 +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)
@@ -717,21 +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)