c5e4d05db8
The capabilities buffer modified by the arch_acpi_set_pdc_bits() is not _PDC-specific, as it can be used by _OSC too. Change the name of that function to better reflect its independence from _PDC and make it take the capabilities buffer address as the argument directly, without any offset, as _OSC and _PDC use different capabilities buffer offsets. No intentional functional impact. Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
137 lines
3.0 KiB
C
137 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2005 Intel Corporation
|
|
* Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
|
|
*
|
|
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
|
|
* - Added _PDC for platforms with Intel CPUs
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "ACPI: " fmt
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/acpi.h>
|
|
#include <acpi/processor.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static void acpi_set_pdc_bits(u32 *buf)
|
|
{
|
|
buf[0] = ACPI_PDC_REVISION_ID;
|
|
buf[1] = 1;
|
|
|
|
/* Enable coordination with firmware's _TSD info */
|
|
buf[2] = ACPI_PDC_SMP_T_SWCOORD;
|
|
|
|
/* Twiddle arch-specific bits needed for _PDC */
|
|
arch_acpi_set_proc_cap_bits(&buf[2]);
|
|
}
|
|
|
|
static struct acpi_object_list *acpi_processor_alloc_pdc(void)
|
|
{
|
|
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)
|
|
goto out;
|
|
|
|
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
|
|
if (!obj) {
|
|
kfree(obj_list);
|
|
goto out;
|
|
}
|
|
|
|
buf = kmalloc(12, GFP_KERNEL);
|
|
if (!buf) {
|
|
kfree(obj);
|
|
kfree(obj_list);
|
|
goto out;
|
|
}
|
|
|
|
acpi_set_pdc_bits(buf);
|
|
|
|
obj->type = ACPI_TYPE_BUFFER;
|
|
obj->buffer.length = 12;
|
|
obj->buffer.pointer = (u8 *) buf;
|
|
obj_list->count = 1;
|
|
obj_list->pointer = obj;
|
|
|
|
return obj_list;
|
|
out:
|
|
pr_err("Memory allocation error\n");
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* _PDC is required for a BIOS-OS handshake for most of the newer
|
|
* ACPI processor features.
|
|
*/
|
|
static acpi_status
|
|
acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
if (boot_option_idle_override == IDLE_NOMWAIT) {
|
|
/*
|
|
* If mwait is disabled for CPU C-states, the C2C3_FFH access
|
|
* mode will be disabled in the parameter of _PDC object.
|
|
* Of course C1_FFH access mode will also be disabled.
|
|
*/
|
|
union acpi_object *obj;
|
|
u32 *buffer = NULL;
|
|
|
|
obj = pdc_in->pointer;
|
|
buffer = (u32 *)(obj->buffer.pointer);
|
|
buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
|
|
|
|
}
|
|
status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
acpi_handle_debug(handle,
|
|
"Could not evaluate _PDC, using legacy perf control\n");
|
|
|
|
return status;
|
|
}
|
|
|
|
void acpi_processor_set_pdc(acpi_handle handle)
|
|
{
|
|
struct acpi_object_list *obj_list;
|
|
|
|
if (arch_has_acpi_pdc() == false)
|
|
return;
|
|
|
|
obj_list = acpi_processor_alloc_pdc();
|
|
if (!obj_list)
|
|
return;
|
|
|
|
acpi_processor_eval_pdc(handle, obj_list);
|
|
|
|
kfree(obj_list->pointer->buffer.pointer);
|
|
kfree(obj_list->pointer);
|
|
kfree(obj_list);
|
|
}
|
|
|
|
static acpi_status __init
|
|
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
if (processor_physically_present(handle) == false)
|
|
return AE_OK;
|
|
|
|
acpi_processor_set_pdc(handle);
|
|
return AE_OK;
|
|
}
|
|
|
|
void __init acpi_early_processor_set_pdc(void)
|
|
{
|
|
acpi_proc_quirk_mwait_check();
|
|
|
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
early_init_pdc, NULL, NULL, NULL);
|
|
acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
|
|
}
|