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![Hanjun Guo](/assets/img/avatar_default.png)
The use of _PDC is deprecated in ACPI 3.0 in favor of _OSC, as ARM platform is supported only in ACPI 5.0 or higher version, _PDC will not be used in ARM platform, so make Make _PDC only for platforms with Intel CPUs. Introduce ARCH_MIGHT_HAVE_ACPI_PDC and move _PDC related code in ACPI processor driver into a single file processor_pdc.c, make x86 and ia64 select it when ACPI is enabled. This patch also use pr_* to replace printk to fix the checkpatch warning and factor acpi_processor_alloc_pdc() a little bit to avoid duplicate pr_err() code. Suggested-by: Robert Richter <rric@kernel.org> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
206 lines
4.7 KiB
C
206 lines
4.7 KiB
C
/*
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* Copyright (C) 2005 Intel Corporation
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* Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
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*
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* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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* - Added _PDC for platforms with Intel CPUs
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*/
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#define pr_fmt(fmt) "ACPI: " fmt
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#include <linux/dmi.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <acpi/processor.h>
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#include "internal.h"
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_pdc");
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static bool __init processor_physically_present(acpi_handle handle)
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{
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int cpuid, type;
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u32 acpi_id;
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acpi_status status;
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acpi_object_type acpi_type;
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unsigned long long tmp;
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union acpi_object object = { 0 };
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struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
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status = acpi_get_type(handle, &acpi_type);
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if (ACPI_FAILURE(status))
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return false;
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switch (acpi_type) {
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case ACPI_TYPE_PROCESSOR:
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status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
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if (ACPI_FAILURE(status))
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return false;
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acpi_id = object.processor.proc_id;
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break;
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case ACPI_TYPE_DEVICE:
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status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return false;
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acpi_id = tmp;
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break;
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default:
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return false;
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}
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type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
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cpuid = acpi_get_cpuid(handle, type, acpi_id);
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if (cpuid == -1)
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return false;
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return true;
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}
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static void acpi_set_pdc_bits(u32 *buf)
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{
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buf[0] = ACPI_PDC_REVISION_ID;
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buf[1] = 1;
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/* Enable coordination with firmware's _TSD info */
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buf[2] = ACPI_PDC_SMP_T_SWCOORD;
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/* Twiddle arch-specific bits needed for _PDC */
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arch_acpi_set_pdc_bits(buf);
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}
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static struct acpi_object_list *acpi_processor_alloc_pdc(void)
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{
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struct acpi_object_list *obj_list;
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union acpi_object *obj;
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u32 *buf;
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/* allocate and initialize pdc. It will be used later. */
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obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
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if (!obj_list)
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goto out;
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obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
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if (!obj) {
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kfree(obj_list);
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goto out;
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}
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buf = kmalloc(12, GFP_KERNEL);
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if (!buf) {
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kfree(obj);
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kfree(obj_list);
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goto out;
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}
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acpi_set_pdc_bits(buf);
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obj->type = ACPI_TYPE_BUFFER;
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obj->buffer.length = 12;
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obj->buffer.pointer = (u8 *) buf;
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obj_list->count = 1;
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obj_list->pointer = obj;
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return obj_list;
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out:
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pr_err("Memory allocation error\n");
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return NULL;
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}
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/*
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* _PDC is required for a BIOS-OS handshake for most of the newer
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* ACPI processor features.
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*/
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static acpi_status
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acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
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{
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acpi_status status = AE_OK;
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if (boot_option_idle_override == IDLE_NOMWAIT) {
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/*
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* If mwait is disabled for CPU C-states, the C2C3_FFH access
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* mode will be disabled in the parameter of _PDC object.
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* Of course C1_FFH access mode will also be disabled.
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*/
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union acpi_object *obj;
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u32 *buffer = NULL;
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obj = pdc_in->pointer;
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buffer = (u32 *)(obj->buffer.pointer);
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buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
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}
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status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
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if (ACPI_FAILURE(status))
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Could not evaluate _PDC, using legacy perf. control.\n"));
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return status;
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}
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void acpi_processor_set_pdc(acpi_handle handle)
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{
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struct acpi_object_list *obj_list;
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if (arch_has_acpi_pdc() == false)
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return;
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obj_list = acpi_processor_alloc_pdc();
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if (!obj_list)
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return;
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acpi_processor_eval_pdc(handle, obj_list);
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kfree(obj_list->pointer->buffer.pointer);
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kfree(obj_list->pointer);
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kfree(obj_list);
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}
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static acpi_status __init
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early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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if (processor_physically_present(handle) == false)
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return AE_OK;
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acpi_processor_set_pdc(handle);
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return AE_OK;
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}
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static int __init set_no_mwait(const struct dmi_system_id *id)
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{
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pr_notice("%s detected - disabling mwait for CPU C-states\n",
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id->ident);
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boot_option_idle_override = IDLE_NOMWAIT;
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return 0;
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}
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static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
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{
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set_no_mwait, "Extensa 5220", {
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DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
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DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
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DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
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{},
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};
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static void __init processor_dmi_check(void)
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{
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/*
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* Check whether the system is DMI table. If yes, OSPM
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* should not use mwait for CPU-states.
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*/
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dmi_check_system(processor_idle_dmi_table);
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}
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void __init acpi_early_processor_set_pdc(void)
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{
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processor_dmi_check();
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acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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early_init_pdc, NULL, NULL, NULL);
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acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
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}
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