mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-26 03:17:48 +00:00
5b53496a5a
991528d734
(ACPI: Processor native C-states using MWAIT)
started passing C2C3_FFH to _PDC to tell the BIOS
that Linux supports MWAIT for deep C-states.
However, we should first double check with the hardware
that it actually supports MWAIT before potentially exposing
a BIOS bug of an MWAIT _CST on HW that doesn't support MWAIT.
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/*
|
|
* Copyright (C) 2005 Intel Corporation
|
|
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
|
|
* - Added _PDC for platforms with Intel CPUs
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include <acpi/processor.h>
|
|
#include <asm/acpi.h>
|
|
|
|
static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
|
|
{
|
|
struct acpi_object_list *obj_list;
|
|
union acpi_object *obj;
|
|
u32 *buf;
|
|
|
|
/* allocate and initialize pdc. It will be used later. */
|
|
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
|
|
if (!obj_list) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
return;
|
|
}
|
|
|
|
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
|
|
if (!obj) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
kfree(obj_list);
|
|
return;
|
|
}
|
|
|
|
buf = kmalloc(12, GFP_KERNEL);
|
|
if (!buf) {
|
|
printk(KERN_ERR "Memory allocation error\n");
|
|
kfree(obj);
|
|
kfree(obj_list);
|
|
return;
|
|
}
|
|
|
|
buf[0] = ACPI_PDC_REVISION_ID;
|
|
buf[1] = 1;
|
|
buf[2] = ACPI_PDC_C_CAPABILITY_SMP;
|
|
|
|
/*
|
|
* The default of PDC_SMP_T_SWCOORD bit is set for intel x86 cpu so
|
|
* that OSPM is capable of native ACPI throttling software
|
|
* coordination using BIOS supplied _TSD info.
|
|
*/
|
|
buf[2] |= ACPI_PDC_SMP_T_SWCOORD;
|
|
if (cpu_has(c, X86_FEATURE_EST))
|
|
buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
|
|
|
|
if (cpu_has(c, X86_FEATURE_ACPI))
|
|
buf[2] |= ACPI_PDC_T_FFH;
|
|
|
|
/*
|
|
* If mwait/monitor is unsupported, C2/C3_FFH will be disabled
|
|
*/
|
|
if (!cpu_has(c, X86_FEATURE_MWAIT))
|
|
buf[2] &= ~(ACPI_PDC_C_C2C3_FFH);
|
|
|
|
obj->type = ACPI_TYPE_BUFFER;
|
|
obj->buffer.length = 12;
|
|
obj->buffer.pointer = (u8 *) buf;
|
|
obj_list->count = 1;
|
|
obj_list->pointer = obj;
|
|
pr->pdc = obj_list;
|
|
|
|
return;
|
|
}
|
|
|
|
/* Initialize _PDC data based on the CPU vendor */
|
|
void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
|
|
{
|
|
struct cpuinfo_x86 *c = &cpu_data(pr->id);
|
|
|
|
pr->pdc = NULL;
|
|
if (c->x86_vendor == X86_VENDOR_INTEL)
|
|
init_intel_pdc(pr, c);
|
|
|
|
return;
|
|
}
|
|
|
|
EXPORT_SYMBOL(arch_acpi_processor_init_pdc);
|