forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
910 lines
24 KiB
910 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* acpi_processor.c - ACPI processor enumeration support |
|
* |
|
* Copyright (C) 2001, 2002 Andy Grover <[email protected]> |
|
* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]> |
|
* Copyright (C) 2004 Dominik Brodowski <[email protected]> |
|
* Copyright (C) 2004 Anil S Keshavamurthy <[email protected]> |
|
* Copyright (C) 2013, Intel Corporation |
|
* Rafael J. Wysocki <[email protected]> |
|
*/ |
|
|
|
#include <linux/acpi.h> |
|
#include <linux/device.h> |
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/pci.h> |
|
|
|
#include <acpi/processor.h> |
|
|
|
#include <asm/cpu.h> |
|
|
|
#include "internal.h" |
|
|
|
#define _COMPONENT ACPI_PROCESSOR_COMPONENT |
|
|
|
ACPI_MODULE_NAME("processor"); |
|
|
|
DEFINE_PER_CPU(struct acpi_processor *, processors); |
|
EXPORT_PER_CPU_SYMBOL(processors); |
|
|
|
/* -------------------------------------------------------------------------- |
|
Errata Handling |
|
-------------------------------------------------------------------------- */ |
|
|
|
struct acpi_processor_errata errata __read_mostly; |
|
EXPORT_SYMBOL_GPL(errata); |
|
|
|
static int acpi_processor_errata_piix4(struct pci_dev *dev) |
|
{ |
|
u8 value1 = 0; |
|
u8 value2 = 0; |
|
|
|
|
|
if (!dev) |
|
return -EINVAL; |
|
|
|
/* |
|
* Note that 'dev' references the PIIX4 ACPI Controller. |
|
*/ |
|
|
|
switch (dev->revision) { |
|
case 0: |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); |
|
break; |
|
case 1: |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); |
|
break; |
|
case 2: |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); |
|
break; |
|
case 3: |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); |
|
break; |
|
default: |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); |
|
break; |
|
} |
|
|
|
switch (dev->revision) { |
|
|
|
case 0: /* PIIX4 A-step */ |
|
case 1: /* PIIX4 B-step */ |
|
/* |
|
* See specification changes #13 ("Manual Throttle Duty Cycle") |
|
* and #14 ("Enabling and Disabling Manual Throttle"), plus |
|
* erratum #5 ("STPCLK# Deassertion Time") from the January |
|
* 2002 PIIX4 specification update. Applies to only older |
|
* PIIX4 models. |
|
*/ |
|
errata.piix4.throttle = 1; |
|
fallthrough; |
|
|
|
case 2: /* PIIX4E */ |
|
case 3: /* PIIX4M */ |
|
/* |
|
* See erratum #18 ("C3 Power State/BMIDE and Type-F DMA |
|
* Livelock") from the January 2002 PIIX4 specification update. |
|
* Applies to all PIIX4 models. |
|
*/ |
|
|
|
/* |
|
* BM-IDE |
|
* ------ |
|
* Find the PIIX4 IDE Controller and get the Bus Master IDE |
|
* Status register address. We'll use this later to read |
|
* each IDE controller's DMA status to make sure we catch all |
|
* DMA activity. |
|
*/ |
|
dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
|
PCI_DEVICE_ID_INTEL_82371AB, |
|
PCI_ANY_ID, PCI_ANY_ID, NULL); |
|
if (dev) { |
|
errata.piix4.bmisx = pci_resource_start(dev, 4); |
|
pci_dev_put(dev); |
|
} |
|
|
|
/* |
|
* Type-F DMA |
|
* ---------- |
|
* Find the PIIX4 ISA Controller and read the Motherboard |
|
* DMA controller's status to see if Type-F (Fast) DMA mode |
|
* is enabled (bit 7) on either channel. Note that we'll |
|
* disable C3 support if this is enabled, as some legacy |
|
* devices won't operate well if fast DMA is disabled. |
|
*/ |
|
dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
|
PCI_DEVICE_ID_INTEL_82371AB_0, |
|
PCI_ANY_ID, PCI_ANY_ID, NULL); |
|
if (dev) { |
|
pci_read_config_byte(dev, 0x76, &value1); |
|
pci_read_config_byte(dev, 0x77, &value2); |
|
if ((value1 & 0x80) || (value2 & 0x80)) |
|
errata.piix4.fdma = 1; |
|
pci_dev_put(dev); |
|
} |
|
|
|
break; |
|
} |
|
|
|
if (errata.piix4.bmisx) |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"Bus master activity detection (BM-IDE) erratum enabled\n")); |
|
if (errata.piix4.fdma) |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"Type-F DMA livelock erratum (C3 disabled)\n")); |
|
|
|
return 0; |
|
} |
|
|
|
static int acpi_processor_errata(void) |
|
{ |
|
int result = 0; |
|
struct pci_dev *dev = NULL; |
|
|
|
/* |
|
* PIIX4 |
|
*/ |
|
dev = pci_get_subsys(PCI_VENDOR_ID_INTEL, |
|
PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, |
|
PCI_ANY_ID, NULL); |
|
if (dev) { |
|
result = acpi_processor_errata_piix4(dev); |
|
pci_dev_put(dev); |
|
} |
|
|
|
return result; |
|
} |
|
|
|
/* -------------------------------------------------------------------------- |
|
Initialization |
|
-------------------------------------------------------------------------- */ |
|
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU |
|
int __weak acpi_map_cpu(acpi_handle handle, |
|
phys_cpuid_t physid, u32 acpi_id, int *pcpu) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
int __weak acpi_unmap_cpu(int cpu) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
int __weak arch_register_cpu(int cpu) |
|
{ |
|
return -ENODEV; |
|
} |
|
|
|
void __weak arch_unregister_cpu(int cpu) {} |
|
|
|
static int acpi_processor_hotadd_init(struct acpi_processor *pr) |
|
{ |
|
unsigned long long sta; |
|
acpi_status status; |
|
int ret; |
|
|
|
if (invalid_phys_cpuid(pr->phys_id)) |
|
return -ENODEV; |
|
|
|
status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta); |
|
if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) |
|
return -ENODEV; |
|
|
|
cpu_maps_update_begin(); |
|
cpu_hotplug_begin(); |
|
|
|
ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id); |
|
if (ret) |
|
goto out; |
|
|
|
ret = arch_register_cpu(pr->id); |
|
if (ret) { |
|
acpi_unmap_cpu(pr->id); |
|
goto out; |
|
} |
|
|
|
/* |
|
* CPU got hot-added, but cpu_data is not initialized yet. Set a flag |
|
* to delay cpu_idle/throttling initialization and do it when the CPU |
|
* gets online for the first time. |
|
*/ |
|
pr_info("CPU%d has been hot-added\n", pr->id); |
|
pr->flags.need_hotplug_init = 1; |
|
|
|
out: |
|
cpu_hotplug_done(); |
|
cpu_maps_update_done(); |
|
return ret; |
|
} |
|
#else |
|
static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) |
|
{ |
|
return -ENODEV; |
|
} |
|
#endif /* CONFIG_ACPI_HOTPLUG_CPU */ |
|
|
|
static int acpi_processor_get_info(struct acpi_device *device) |
|
{ |
|
union acpi_object object = { 0 }; |
|
struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; |
|
struct acpi_processor *pr = acpi_driver_data(device); |
|
int device_declaration = 0; |
|
acpi_status status = AE_OK; |
|
static int cpu0_initialized; |
|
unsigned long long value; |
|
|
|
acpi_processor_errata(); |
|
|
|
/* |
|
* Check to see if we have bus mastering arbitration control. This |
|
* is required for proper C3 usage (to maintain cache coherency). |
|
*/ |
|
if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { |
|
pr->flags.bm_control = 1; |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"Bus mastering arbitration control present\n")); |
|
} else |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
|
"No bus mastering arbitration control\n")); |
|
|
|
if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { |
|
/* Declared with "Processor" statement; match ProcessorID */ |
|
status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); |
|
if (ACPI_FAILURE(status)) { |
|
dev_err(&device->dev, |
|
"Failed to evaluate processor object (0x%x)\n", |
|
status); |
|
return -ENODEV; |
|
} |
|
|
|
pr->acpi_id = object.processor.proc_id; |
|
} else { |
|
/* |
|
* Declared with "Device" statement; match _UID. |
|
*/ |
|
status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, |
|
NULL, &value); |
|
if (ACPI_FAILURE(status)) { |
|
dev_err(&device->dev, |
|
"Failed to evaluate processor _UID (0x%x)\n", |
|
status); |
|
return -ENODEV; |
|
} |
|
device_declaration = 1; |
|
pr->acpi_id = value; |
|
} |
|
|
|
if (acpi_duplicate_processor_id(pr->acpi_id)) { |
|
if (pr->acpi_id == 0xff) |
|
dev_info_once(&device->dev, |
|
"Entry not well-defined, consider updating BIOS\n"); |
|
else |
|
dev_err(&device->dev, |
|
"Failed to get unique processor _UID (0x%x)\n", |
|
pr->acpi_id); |
|
return -ENODEV; |
|
} |
|
|
|
pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration, |
|
pr->acpi_id); |
|
if (invalid_phys_cpuid(pr->phys_id)) |
|
acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n"); |
|
|
|
pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id); |
|
if (!cpu0_initialized && !acpi_has_cpu_in_madt()) { |
|
cpu0_initialized = 1; |
|
/* |
|
* Handle UP system running SMP kernel, with no CPU |
|
* entry in MADT |
|
*/ |
|
if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1)) |
|
pr->id = 0; |
|
} |
|
|
|
/* |
|
* Extra Processor objects may be enumerated on MP systems with |
|
* less than the max # of CPUs. They should be ignored _iff |
|
* they are physically not present. |
|
* |
|
* NOTE: Even if the processor has a cpuid, it may not be present |
|
* because cpuid <-> apicid mapping is persistent now. |
|
*/ |
|
if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { |
|
int ret = acpi_processor_hotadd_init(pr); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
/* |
|
* On some boxes several processors use the same processor bus id. |
|
* But they are located in different scope. For example: |
|
* \_SB.SCK0.CPU0 |
|
* \_SB.SCK1.CPU0 |
|
* Rename the processor device bus id. And the new bus id will be |
|
* generated as the following format: |
|
* CPU+CPU ID. |
|
*/ |
|
sprintf(acpi_device_bid(device), "CPU%X", pr->id); |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id, |
|
pr->acpi_id)); |
|
|
|
if (!object.processor.pblk_address) |
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n")); |
|
else if (object.processor.pblk_length != 6) |
|
dev_err(&device->dev, "Invalid PBLK length [%d]\n", |
|
object.processor.pblk_length); |
|
else { |
|
pr->throttling.address = object.processor.pblk_address; |
|
pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; |
|
pr->throttling.duty_width = acpi_gbl_FADT.duty_width; |
|
|
|
pr->pblk = object.processor.pblk_address; |
|
} |
|
|
|
/* |
|
* If ACPI describes a slot number for this CPU, we can use it to |
|
* ensure we get the right value in the "physical id" field |
|
* of /proc/cpuinfo |
|
*/ |
|
status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value); |
|
if (ACPI_SUCCESS(status)) |
|
arch_fix_phys_package_id(pr->id, value); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Do not put anything in here which needs the core to be online. |
|
* For example MSR access or setting up things which check for cpuinfo_x86 |
|
* (cpu_data(cpu)) values, like CPU feature flags, family, model, etc. |
|
* Such things have to be put in and set up by the processor driver's .probe(). |
|
*/ |
|
static DEFINE_PER_CPU(void *, processor_device_array); |
|
|
|
static int acpi_processor_add(struct acpi_device *device, |
|
const struct acpi_device_id *id) |
|
{ |
|
struct acpi_processor *pr; |
|
struct device *dev; |
|
int result = 0; |
|
|
|
pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); |
|
if (!pr) |
|
return -ENOMEM; |
|
|
|
if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { |
|
result = -ENOMEM; |
|
goto err_free_pr; |
|
} |
|
|
|
pr->handle = device->handle; |
|
strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); |
|
strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); |
|
device->driver_data = pr; |
|
|
|
result = acpi_processor_get_info(device); |
|
if (result) /* Processor is not physically present or unavailable */ |
|
return 0; |
|
|
|
BUG_ON(pr->id >= nr_cpu_ids); |
|
|
|
/* |
|
* Buggy BIOS check. |
|
* ACPI id of processors can be reported wrongly by the BIOS. |
|
* Don't trust it blindly |
|
*/ |
|
if (per_cpu(processor_device_array, pr->id) != NULL && |
|
per_cpu(processor_device_array, pr->id) != device) { |
|
dev_warn(&device->dev, |
|
"BIOS reported wrong ACPI id %d for the processor\n", |
|
pr->id); |
|
/* Give up, but do not abort the namespace scan. */ |
|
goto err; |
|
} |
|
/* |
|
* processor_device_array is not cleared on errors to allow buggy BIOS |
|
* checks. |
|
*/ |
|
per_cpu(processor_device_array, pr->id) = device; |
|
per_cpu(processors, pr->id) = pr; |
|
|
|
dev = get_cpu_device(pr->id); |
|
if (!dev) { |
|
result = -ENODEV; |
|
goto err; |
|
} |
|
|
|
result = acpi_bind_one(dev, device); |
|
if (result) |
|
goto err; |
|
|
|
pr->dev = dev; |
|
|
|
/* Trigger the processor driver's .probe() if present. */ |
|
if (device_attach(dev) >= 0) |
|
return 1; |
|
|
|
dev_err(dev, "Processor driver could not be attached\n"); |
|
acpi_unbind_one(dev); |
|
|
|
err: |
|
free_cpumask_var(pr->throttling.shared_cpu_map); |
|
device->driver_data = NULL; |
|
per_cpu(processors, pr->id) = NULL; |
|
err_free_pr: |
|
kfree(pr); |
|
return result; |
|
} |
|
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU |
|
/* -------------------------------------------------------------------------- |
|
Removal |
|
-------------------------------------------------------------------------- */ |
|
|
|
static void acpi_processor_remove(struct acpi_device *device) |
|
{ |
|
struct acpi_processor *pr; |
|
|
|
if (!device || !acpi_driver_data(device)) |
|
return; |
|
|
|
pr = acpi_driver_data(device); |
|
if (pr->id >= nr_cpu_ids) |
|
goto out; |
|
|
|
/* |
|
* The only reason why we ever get here is CPU hot-removal. The CPU is |
|
* already offline and the ACPI device removal locking prevents it from |
|
* being put back online at this point. |
|
* |
|
* Unbind the driver from the processor device and detach it from the |
|
* ACPI companion object. |
|
*/ |
|
device_release_driver(pr->dev); |
|
acpi_unbind_one(pr->dev); |
|
|
|
/* Clean up. */ |
|
per_cpu(processor_device_array, pr->id) = NULL; |
|
per_cpu(processors, pr->id) = NULL; |
|
|
|
cpu_maps_update_begin(); |
|
cpu_hotplug_begin(); |
|
|
|
/* Remove the CPU. */ |
|
arch_unregister_cpu(pr->id); |
|
acpi_unmap_cpu(pr->id); |
|
|
|
cpu_hotplug_done(); |
|
cpu_maps_update_done(); |
|
|
|
try_offline_node(cpu_to_node(pr->id)); |
|
|
|
out: |
|
free_cpumask_var(pr->throttling.shared_cpu_map); |
|
kfree(pr); |
|
} |
|
#endif /* CONFIG_ACPI_HOTPLUG_CPU */ |
|
|
|
#ifdef CONFIG_X86 |
|
static bool acpi_hwp_native_thermal_lvt_set; |
|
static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle, |
|
u32 lvl, |
|
void *context, |
|
void **rv) |
|
{ |
|
u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953"; |
|
u32 capbuf[2]; |
|
struct acpi_osc_context osc_context = { |
|
.uuid_str = sb_uuid_str, |
|
.rev = 1, |
|
.cap.length = 8, |
|
.cap.pointer = capbuf, |
|
}; |
|
|
|
if (acpi_hwp_native_thermal_lvt_set) |
|
return AE_CTRL_TERMINATE; |
|
|
|
capbuf[0] = 0x0000; |
|
capbuf[1] = 0x1000; /* set bit 12 */ |
|
|
|
if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) { |
|
if (osc_context.ret.pointer && osc_context.ret.length > 1) { |
|
u32 *capbuf_ret = osc_context.ret.pointer; |
|
|
|
if (capbuf_ret[1] & 0x1000) { |
|
acpi_handle_info(handle, |
|
"_OSC native thermal LVT Acked\n"); |
|
acpi_hwp_native_thermal_lvt_set = true; |
|
} |
|
} |
|
kfree(osc_context.ret.pointer); |
|
} |
|
|
|
return AE_OK; |
|
} |
|
|
|
void __init acpi_early_processor_osc(void) |
|
{ |
|
if (boot_cpu_has(X86_FEATURE_HWP)) { |
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
|
ACPI_UINT32_MAX, |
|
acpi_hwp_native_thermal_lvt_osc, |
|
NULL, NULL, NULL); |
|
acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, |
|
acpi_hwp_native_thermal_lvt_osc, |
|
NULL, NULL); |
|
} |
|
} |
|
#endif |
|
|
|
/* |
|
* The following ACPI IDs are known to be suitable for representing as |
|
* processor devices. |
|
*/ |
|
static const struct acpi_device_id processor_device_ids[] = { |
|
|
|
{ ACPI_PROCESSOR_OBJECT_HID, }, |
|
{ ACPI_PROCESSOR_DEVICE_HID, }, |
|
|
|
{ } |
|
}; |
|
|
|
static struct acpi_scan_handler processor_handler = { |
|
.ids = processor_device_ids, |
|
.attach = acpi_processor_add, |
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU |
|
.detach = acpi_processor_remove, |
|
#endif |
|
.hotplug = { |
|
.enabled = true, |
|
}, |
|
}; |
|
|
|
static int acpi_processor_container_attach(struct acpi_device *dev, |
|
const struct acpi_device_id *id) |
|
{ |
|
return 1; |
|
} |
|
|
|
static const struct acpi_device_id processor_container_ids[] = { |
|
{ ACPI_PROCESSOR_CONTAINER_HID, }, |
|
{ } |
|
}; |
|
|
|
static struct acpi_scan_handler processor_container_handler = { |
|
.ids = processor_container_ids, |
|
.attach = acpi_processor_container_attach, |
|
}; |
|
|
|
/* The number of the unique processor IDs */ |
|
static int nr_unique_ids __initdata; |
|
|
|
/* The number of the duplicate processor IDs */ |
|
static int nr_duplicate_ids; |
|
|
|
/* Used to store the unique processor IDs */ |
|
static int unique_processor_ids[] __initdata = { |
|
[0 ... NR_CPUS - 1] = -1, |
|
}; |
|
|
|
/* Used to store the duplicate processor IDs */ |
|
static int duplicate_processor_ids[] = { |
|
[0 ... NR_CPUS - 1] = -1, |
|
}; |
|
|
|
static void __init processor_validated_ids_update(int proc_id) |
|
{ |
|
int i; |
|
|
|
if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS) |
|
return; |
|
|
|
/* |
|
* Firstly, compare the proc_id with duplicate IDs, if the proc_id is |
|
* already in the IDs, do nothing. |
|
*/ |
|
for (i = 0; i < nr_duplicate_ids; i++) { |
|
if (duplicate_processor_ids[i] == proc_id) |
|
return; |
|
} |
|
|
|
/* |
|
* Secondly, compare the proc_id with unique IDs, if the proc_id is in |
|
* the IDs, put it in the duplicate IDs. |
|
*/ |
|
for (i = 0; i < nr_unique_ids; i++) { |
|
if (unique_processor_ids[i] == proc_id) { |
|
duplicate_processor_ids[nr_duplicate_ids] = proc_id; |
|
nr_duplicate_ids++; |
|
return; |
|
} |
|
} |
|
|
|
/* |
|
* Lastly, the proc_id is a unique ID, put it in the unique IDs. |
|
*/ |
|
unique_processor_ids[nr_unique_ids] = proc_id; |
|
nr_unique_ids++; |
|
} |
|
|
|
static acpi_status __init acpi_processor_ids_walk(acpi_handle handle, |
|
u32 lvl, |
|
void *context, |
|
void **rv) |
|
{ |
|
acpi_status status; |
|
acpi_object_type acpi_type; |
|
unsigned long long uid; |
|
union acpi_object object = { 0 }; |
|
struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; |
|
|
|
status = acpi_get_type(handle, &acpi_type); |
|
if (ACPI_FAILURE(status)) |
|
return status; |
|
|
|
switch (acpi_type) { |
|
case ACPI_TYPE_PROCESSOR: |
|
status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
|
if (ACPI_FAILURE(status)) |
|
goto err; |
|
uid = object.processor.proc_id; |
|
break; |
|
|
|
case ACPI_TYPE_DEVICE: |
|
status = acpi_evaluate_integer(handle, "_UID", NULL, &uid); |
|
if (ACPI_FAILURE(status)) |
|
goto err; |
|
break; |
|
default: |
|
goto err; |
|
} |
|
|
|
processor_validated_ids_update(uid); |
|
return AE_OK; |
|
|
|
err: |
|
/* Exit on error, but don't abort the namespace walk */ |
|
acpi_handle_info(handle, "Invalid processor object\n"); |
|
return AE_OK; |
|
|
|
} |
|
|
|
static void __init acpi_processor_check_duplicates(void) |
|
{ |
|
/* check the correctness for all processors in ACPI namespace */ |
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
|
ACPI_UINT32_MAX, |
|
acpi_processor_ids_walk, |
|
NULL, NULL, NULL); |
|
acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk, |
|
NULL, NULL); |
|
} |
|
|
|
bool acpi_duplicate_processor_id(int proc_id) |
|
{ |
|
int i; |
|
|
|
/* |
|
* compare the proc_id with duplicate IDs, if the proc_id is already |
|
* in the duplicate IDs, return true, otherwise, return false. |
|
*/ |
|
for (i = 0; i < nr_duplicate_ids; i++) { |
|
if (duplicate_processor_ids[i] == proc_id) |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
void __init acpi_processor_init(void) |
|
{ |
|
acpi_processor_check_duplicates(); |
|
acpi_scan_add_handler_with_hotplug(&processor_handler, "processor"); |
|
acpi_scan_add_handler(&processor_container_handler); |
|
} |
|
|
|
#ifdef CONFIG_ACPI_PROCESSOR_CSTATE |
|
/** |
|
* acpi_processor_claim_cst_control - Request _CST control from the platform. |
|
*/ |
|
bool acpi_processor_claim_cst_control(void) |
|
{ |
|
static bool cst_control_claimed; |
|
acpi_status status; |
|
|
|
if (!acpi_gbl_FADT.cst_control || cst_control_claimed) |
|
return true; |
|
|
|
status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
|
acpi_gbl_FADT.cst_control, 8); |
|
if (ACPI_FAILURE(status)) { |
|
pr_warn("ACPI: Failed to claim processor _CST control\n"); |
|
return false; |
|
} |
|
|
|
cst_control_claimed = true; |
|
return true; |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_processor_claim_cst_control); |
|
|
|
/** |
|
* acpi_processor_evaluate_cst - Evaluate the processor _CST control method. |
|
* @handle: ACPI handle of the processor object containing the _CST. |
|
* @cpu: The numeric ID of the target CPU. |
|
* @info: Object write the C-states information into. |
|
* |
|
* Extract the C-state information for the given CPU from the output of the _CST |
|
* control method under the corresponding ACPI processor object (or processor |
|
* device object) and populate @info with it. |
|
* |
|
* If any ACPI_ADR_SPACE_FIXED_HARDWARE C-states are found, invoke |
|
* acpi_processor_ffh_cstate_probe() to verify them and update the |
|
* cpu_cstate_entry data for @cpu. |
|
*/ |
|
int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, |
|
struct acpi_processor_power *info) |
|
{ |
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
|
union acpi_object *cst; |
|
acpi_status status; |
|
u64 count; |
|
int last_index = 0; |
|
int i, ret = 0; |
|
|
|
status = acpi_evaluate_object(handle, "_CST", NULL, &buffer); |
|
if (ACPI_FAILURE(status)) { |
|
acpi_handle_debug(handle, "No _CST\n"); |
|
return -ENODEV; |
|
} |
|
|
|
cst = buffer.pointer; |
|
|
|
/* There must be at least 2 elements. */ |
|
if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) { |
|
acpi_handle_warn(handle, "Invalid _CST output\n"); |
|
ret = -EFAULT; |
|
goto end; |
|
} |
|
|
|
count = cst->package.elements[0].integer.value; |
|
|
|
/* Validate the number of C-states. */ |
|
if (count < 1 || count != cst->package.count - 1) { |
|
acpi_handle_warn(handle, "Inconsistent _CST data\n"); |
|
ret = -EFAULT; |
|
goto end; |
|
} |
|
|
|
for (i = 1; i <= count; i++) { |
|
union acpi_object *element; |
|
union acpi_object *obj; |
|
struct acpi_power_register *reg; |
|
struct acpi_processor_cx cx; |
|
|
|
/* |
|
* If there is not enough space for all C-states, skip the |
|
* excess ones and log a warning. |
|
*/ |
|
if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) { |
|
acpi_handle_warn(handle, |
|
"No room for more idle states (limit: %d)\n", |
|
ACPI_PROCESSOR_MAX_POWER - 1); |
|
break; |
|
} |
|
|
|
memset(&cx, 0, sizeof(cx)); |
|
|
|
element = &cst->package.elements[i]; |
|
if (element->type != ACPI_TYPE_PACKAGE) { |
|
acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n", |
|
i, element->type); |
|
continue; |
|
} |
|
|
|
if (element->package.count != 4) { |
|
acpi_handle_info(handle, "_CST C%d package count(%d) is not 4, skip...\n", |
|
i, element->package.count); |
|
continue; |
|
} |
|
|
|
obj = &element->package.elements[0]; |
|
|
|
if (obj->type != ACPI_TYPE_BUFFER) { |
|
acpi_handle_info(handle, "_CST C%d package element[0] type(%x) is not buffer, skip...\n", |
|
i, obj->type); |
|
continue; |
|
} |
|
|
|
reg = (struct acpi_power_register *)obj->buffer.pointer; |
|
|
|
obj = &element->package.elements[1]; |
|
if (obj->type != ACPI_TYPE_INTEGER) { |
|
acpi_handle_info(handle, "_CST C[%d] package element[1] type(%x) is not integer, skip...\n", |
|
i, obj->type); |
|
continue; |
|
} |
|
|
|
cx.type = obj->integer.value; |
|
/* |
|
* There are known cases in which the _CST output does not |
|
* contain C1, so if the type of the first state found is not |
|
* C1, leave an empty slot for C1 to be filled in later. |
|
*/ |
|
if (i == 1 && cx.type != ACPI_STATE_C1) |
|
last_index = 1; |
|
|
|
cx.address = reg->address; |
|
cx.index = last_index + 1; |
|
|
|
if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { |
|
if (!acpi_processor_ffh_cstate_probe(cpu, &cx, reg)) { |
|
/* |
|
* In the majority of cases _CST describes C1 as |
|
* a FIXED_HARDWARE C-state, but if the command |
|
* line forbids using MWAIT, use CSTATE_HALT for |
|
* C1 regardless. |
|
*/ |
|
if (cx.type == ACPI_STATE_C1 && |
|
boot_option_idle_override == IDLE_NOMWAIT) { |
|
cx.entry_method = ACPI_CSTATE_HALT; |
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
|
} else { |
|
cx.entry_method = ACPI_CSTATE_FFH; |
|
} |
|
} else if (cx.type == ACPI_STATE_C1) { |
|
/* |
|
* In the special case of C1, FIXED_HARDWARE can |
|
* be handled by executing the HLT instruction. |
|
*/ |
|
cx.entry_method = ACPI_CSTATE_HALT; |
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT"); |
|
} else { |
|
acpi_handle_info(handle, "_CST C%d declares FIXED_HARDWARE C-state but not supported in hardware, skip...\n", |
|
i); |
|
continue; |
|
} |
|
} else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { |
|
cx.entry_method = ACPI_CSTATE_SYSTEMIO; |
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x", |
|
cx.address); |
|
} else { |
|
acpi_handle_info(handle, "_CST C%d space_id(%x) neither FIXED_HARDWARE nor SYSTEM_IO, skip...\n", |
|
i, reg->space_id); |
|
continue; |
|
} |
|
|
|
if (cx.type == ACPI_STATE_C1) |
|
cx.valid = 1; |
|
|
|
obj = &element->package.elements[2]; |
|
if (obj->type != ACPI_TYPE_INTEGER) { |
|
acpi_handle_info(handle, "_CST C%d package element[2] type(%x) not integer, skip...\n", |
|
i, obj->type); |
|
continue; |
|
} |
|
|
|
cx.latency = obj->integer.value; |
|
|
|
obj = &element->package.elements[3]; |
|
if (obj->type != ACPI_TYPE_INTEGER) { |
|
acpi_handle_info(handle, "_CST C%d package element[3] type(%x) not integer, skip...\n", |
|
i, obj->type); |
|
continue; |
|
} |
|
|
|
memcpy(&info->states[++last_index], &cx, sizeof(cx)); |
|
} |
|
|
|
acpi_handle_info(handle, "Found %d idle states\n", last_index); |
|
|
|
info->count = last_index; |
|
|
|
end: |
|
kfree(buffer.pointer); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(acpi_processor_evaluate_cst); |
|
#endif /* CONFIG_ACPI_PROCESSOR_CSTATE */
|
|
|