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5273a25837
kfree() on a NULL pointer is a no-op, so remove a redundant NULL pointer check in map_mat_entry(). [rjw: Changelog] Signed-off-by: Syam Sidhardhan <s.syam@samsung.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
380 lines
9.0 KiB
C
380 lines
9.0 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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* Alex Chiang <achiang@hp.com>
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* - Unified x86/ia64 implementations
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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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#include <linux/export.h>
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#include <linux/dmi.h>
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#include <linux/slab.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/processor.h>
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#include "internal.h"
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#define PREFIX "ACPI: "
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_core");
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static int __init set_no_mwait(const struct dmi_system_id *id)
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{
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printk(KERN_NOTICE PREFIX "%s detected - "
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"disabling mwait for CPU C-states\n", 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 __initdata processor_idle_dmi_table[] = {
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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 int map_lapic_id(struct acpi_subtable_header *entry,
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u32 acpi_id, int *apic_id)
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{
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struct acpi_madt_local_apic *lapic =
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(struct acpi_madt_local_apic *)entry;
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if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
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return 0;
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if (lapic->processor_id != acpi_id)
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return 0;
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*apic_id = lapic->id;
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return 1;
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}
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static int map_x2apic_id(struct acpi_subtable_header *entry,
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int device_declaration, u32 acpi_id, int *apic_id)
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{
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struct acpi_madt_local_x2apic *apic =
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(struct acpi_madt_local_x2apic *)entry;
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if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
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return 0;
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if (device_declaration && (apic->uid == acpi_id)) {
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*apic_id = apic->local_apic_id;
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return 1;
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}
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return 0;
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}
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static int map_lsapic_id(struct acpi_subtable_header *entry,
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int device_declaration, u32 acpi_id, int *apic_id)
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{
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struct acpi_madt_local_sapic *lsapic =
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(struct acpi_madt_local_sapic *)entry;
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if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
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return 0;
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if (device_declaration) {
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if ((entry->length < 16) || (lsapic->uid != acpi_id))
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return 0;
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} else if (lsapic->processor_id != acpi_id)
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return 0;
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*apic_id = (lsapic->id << 8) | lsapic->eid;
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return 1;
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}
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static int map_madt_entry(int type, u32 acpi_id)
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{
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unsigned long madt_end, entry;
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static struct acpi_table_madt *madt;
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static int read_madt;
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int apic_id = -1;
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if (!read_madt) {
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if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
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(struct acpi_table_header **)&madt)))
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madt = NULL;
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read_madt++;
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}
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if (!madt)
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return apic_id;
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entry = (unsigned long)madt;
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madt_end = entry + madt->header.length;
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/* Parse all entries looking for a match. */
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entry += sizeof(struct acpi_table_madt);
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while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
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struct acpi_subtable_header *header =
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(struct acpi_subtable_header *)entry;
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if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
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if (map_lapic_id(header, acpi_id, &apic_id))
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break;
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} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
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if (map_x2apic_id(header, type, acpi_id, &apic_id))
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break;
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} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
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if (map_lsapic_id(header, type, acpi_id, &apic_id))
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break;
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}
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entry += header->length;
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}
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return apic_id;
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}
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static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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struct acpi_subtable_header *header;
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int apic_id = -1;
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if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
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goto exit;
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if (!buffer.length || !buffer.pointer)
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goto exit;
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obj = buffer.pointer;
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if (obj->type != ACPI_TYPE_BUFFER ||
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obj->buffer.length < sizeof(struct acpi_subtable_header)) {
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goto exit;
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}
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header = (struct acpi_subtable_header *)obj->buffer.pointer;
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if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
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map_lapic_id(header, acpi_id, &apic_id);
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} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
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map_lsapic_id(header, type, acpi_id, &apic_id);
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}
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exit:
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kfree(buffer.pointer);
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return apic_id;
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}
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int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
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{
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#ifdef CONFIG_SMP
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int i;
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#endif
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int apic_id = -1;
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apic_id = map_mat_entry(handle, type, acpi_id);
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if (apic_id == -1)
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apic_id = map_madt_entry(type, acpi_id);
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if (apic_id == -1) {
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/*
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* On UP processor, there is no _MAT or MADT table.
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* So above apic_id is always set to -1.
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*
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* BIOS may define multiple CPU handles even for UP processor.
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* For example,
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*
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* Scope (_PR)
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* {
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* Processor (CPU0, 0x00, 0x00000410, 0x06) {}
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* Processor (CPU1, 0x01, 0x00000410, 0x06) {}
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* Processor (CPU2, 0x02, 0x00000410, 0x06) {}
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* Processor (CPU3, 0x03, 0x00000410, 0x06) {}
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* }
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*
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* Ignores apic_id and always returns 0 for the processor
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* handle with acpi id 0 if nr_cpu_ids is 1.
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* This should be the case if SMP tables are not found.
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* Return -1 for other CPU's handle.
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*/
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if (nr_cpu_ids <= 1 && acpi_id == 0)
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return acpi_id;
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else
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return apic_id;
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}
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#ifdef CONFIG_SMP
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for_each_possible_cpu(i) {
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if (cpu_physical_id(i) == apic_id)
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return i;
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}
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#else
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/* In UP kernel, only processor 0 is valid */
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if (apic_id == 0)
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return apic_id;
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#endif
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return -1;
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}
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EXPORT_SYMBOL_GPL(acpi_get_cpuid);
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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 __cpuinit 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 *__cpuinit 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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printk(KERN_ERR "Memory allocation error\n");
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return NULL;
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}
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obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
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if (!obj) {
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printk(KERN_ERR "Memory allocation error\n");
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kfree(obj_list);
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return NULL;
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}
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buf = kmalloc(12, GFP_KERNEL);
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if (!buf) {
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printk(KERN_ERR "Memory allocation error\n");
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kfree(obj);
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kfree(obj_list);
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return NULL;
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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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}
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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 int __cpuinit
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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 __cpuinit 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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void __init acpi_early_processor_set_pdc(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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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("ACPI0007", early_init_pdc, NULL, NULL);
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}
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