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authorLinus Torvalds <torvalds@linux-foundation.org>2009-01-10 06:12:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-10 06:12:18 -0800
commit4e9b1c184cadbece3694603de5f880b6e35bd7a7 (patch)
tree8ae2ab8a4eaab4d46b4460284fd5ee475ce9a42d /arch/x86/kernel/acpi
parent0176260fc30842e358cf34afa7dcd9413db44822 (diff)
parent36c401a44abcc389a00f9cd14892c9cf9bf0780d (diff)
Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: [IA64] fix typo in cpumask_of_pcibus() x86: fix x86_32 builds for summit and es7000 arch's cpumask: use work_on_cpu in acpi-cpufreq.c for read_measured_perf_ctrs cpumask: use work_on_cpu in acpi-cpufreq.c for drv_read and drv_write cpumask: use cpumask_var_t in acpi-cpufreq.c cpumask: use work_on_cpu in acpi/cstate.c cpumask: convert struct cpufreq_policy to cpumask_var_t cpumask: replace CPUMASK_ALLOC etc with cpumask_var_t x86: cleanup remaining cpumask_t ops in smpboot code cpumask: update pci_bus_show_cpuaffinity to use new cpumask API cpumask: update local_cpus_show to use new cpumask API ia64: cpumask fix for is_affinity_mask_valid()
Diffstat (limited to 'arch/x86/kernel/acpi')
-rw-r--r--arch/x86/kernel/acpi/cstate.c70
1 files changed, 37 insertions, 33 deletions
diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index a4805b3b409..bbbe4bbb6f3 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -67,35 +67,15 @@ static short mwait_supported[ACPI_PROCESSOR_MAX_POWER];
#define NATIVE_CSTATE_BEYOND_HALT (2)
-int acpi_processor_ffh_cstate_probe(unsigned int cpu,
- struct acpi_processor_cx *cx, struct acpi_power_register *reg)
+static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
{
- struct cstate_entry *percpu_entry;
- struct cpuinfo_x86 *c = &cpu_data(cpu);
-
- cpumask_t saved_mask;
- int retval;
+ struct acpi_processor_cx *cx = _cx;
+ long retval;
unsigned int eax, ebx, ecx, edx;
unsigned int edx_part;
unsigned int cstate_type; /* C-state type and not ACPI C-state type */
unsigned int num_cstate_subtype;
- if (!cpu_cstate_entry || c->cpuid_level < CPUID_MWAIT_LEAF )
- return -1;
-
- if (reg->bit_offset != NATIVE_CSTATE_BEYOND_HALT)
- return -1;
-
- percpu_entry = per_cpu_ptr(cpu_cstate_entry, cpu);
- percpu_entry->states[cx->index].eax = 0;
- percpu_entry->states[cx->index].ecx = 0;
-
- /* Make sure we are running on right CPU */
- saved_mask = current->cpus_allowed;
- retval = set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
- if (retval)
- return -1;
-
cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
/* Check whether this particular cx_type (in CST) is supported or not */
@@ -116,21 +96,45 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu,
retval = -1;
goto out;
}
- percpu_entry->states[cx->index].ecx = MWAIT_ECX_INTERRUPT_BREAK;
-
- /* Use the hint in CST */
- percpu_entry->states[cx->index].eax = cx->address;
if (!mwait_supported[cstate_type]) {
mwait_supported[cstate_type] = 1;
- printk(KERN_DEBUG "Monitor-Mwait will be used to enter C-%d "
- "state\n", cx->type);
+ printk(KERN_DEBUG
+ "Monitor-Mwait will be used to enter C-%d "
+ "state\n", cx->type);
}
- snprintf(cx->desc, ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
- cx->address);
-
+ snprintf(cx->desc,
+ ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
+ cx->address);
out:
- set_cpus_allowed_ptr(current, &saved_mask);
+ return retval;
+}
+
+int acpi_processor_ffh_cstate_probe(unsigned int cpu,
+ struct acpi_processor_cx *cx, struct acpi_power_register *reg)
+{
+ struct cstate_entry *percpu_entry;
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
+ long retval;
+
+ if (!cpu_cstate_entry || c->cpuid_level < CPUID_MWAIT_LEAF)
+ return -1;
+
+ if (reg->bit_offset != NATIVE_CSTATE_BEYOND_HALT)
+ return -1;
+
+ percpu_entry = per_cpu_ptr(cpu_cstate_entry, cpu);
+ percpu_entry->states[cx->index].eax = 0;
+ percpu_entry->states[cx->index].ecx = 0;
+
+ /* Make sure we are running on right CPU */
+
+ retval = work_on_cpu(cpu, acpi_processor_ffh_cstate_probe_cpu, cx);
+ if (retval == 0) {
+ /* Use the hint in CST */
+ percpu_entry->states[cx->index].eax = cx->address;
+ percpu_entry->states[cx->index].ecx = MWAIT_ECX_INTERRUPT_BREAK;
+ }
return retval;
}
EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_probe);