cregit-Linux how code gets into the kernel

Release 4.14 drivers/acpi/processor_core.c

Directory: drivers/acpi
/*
 * Copyright (C) 2005 Intel Corporation
 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
 *
 *      Alex Chiang <achiang@hp.com>
 *      - Unified x86/ia64 implementations
 *
 * I/O APIC hotplug support
 *      Yinghai Lu <yinghai@kernel.org>
 *      Jiang Liu <jiang.liu@intel.com>
 */
#include <linux/export.h>
#include <linux/acpi.h>
#include <acpi/processor.h>


#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_core");


static struct acpi_table_madt *get_madt_table(void) { static struct acpi_table_madt *madt; static int read_madt; if (!read_madt) { if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, (struct acpi_table_header **)&madt))) madt = NULL; read_madt++; } return madt; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu58100.00%1100.00%
Total58100.00%1100.00%


static int map_lapic_id(struct acpi_subtable_header *entry, u32 acpi_id, phys_cpuid_t *apic_id) { struct acpi_madt_local_apic *lapic = container_of(entry, struct acpi_madt_local_apic, header); if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) return -ENODEV; if (lapic->processor_id != acpi_id) return -EINVAL; *apic_id = lapic->id; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Chiang5781.43%240.00%
Fabian Frederick710.00%120.00%
Hanjun Guo57.14%120.00%
Catalin Marinas11.43%120.00%
Total70100.00%5100.00%


static int map_x2apic_id(struct acpi_subtable_header *entry, int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) { struct acpi_madt_local_x2apic *apic = container_of(entry, struct acpi_madt_local_x2apic, header); if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) return -ENODEV; if (device_declaration && (apic->uid == acpi_id)) { *apic_id = apic->local_apic_id; return 0; } return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Chiang6683.54%240.00%
Fabian Frederick78.86%120.00%
Hanjun Guo56.33%120.00%
Catalin Marinas11.27%120.00%
Total79100.00%5100.00%


static int map_lsapic_id(struct acpi_subtable_header *entry, int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) { struct acpi_madt_local_sapic *lsapic = container_of(entry, struct acpi_madt_local_sapic, header); if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) return -ENODEV; if (device_declaration) { if ((entry->length < 16) || (lsapic->uid != acpi_id)) return -EINVAL; } else if (lsapic->processor_id != acpi_id) return -EINVAL; *apic_id = (lsapic->id << 8) | lsapic->eid; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Chiang9586.36%240.00%
Fabian Frederick76.36%120.00%
Hanjun Guo76.36%120.00%
Catalin Marinas10.91%120.00%
Total110100.00%5100.00%

/* * Retrieve the ARM CPU physical identifier (MPIDR) */
static int map_gicc_mpidr(struct acpi_subtable_header *entry, int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr) { struct acpi_madt_generic_interrupt *gicc = container_of(entry, struct acpi_madt_generic_interrupt, header); if (!(gicc->flags & ACPI_MADT_ENABLED)) return -ENODEV; /* device_declaration means Device object in DSDT, in the * GIC interrupt model, logical processors are required to * have a Processor Device object in the DSDT, so we should * check device_declaration here */ if (device_declaration && (gicc->uid == acpi_id)) { *mpidr = gicc->arm_mpidr; return 0; } return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Hanjun Guo80100.00%1100.00%
Total80100.00%1100.00%


static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, int type, u32 acpi_id) { unsigned long madt_end, entry; phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */ if (!madt) return phys_id; entry = (unsigned long)madt; madt_end = entry + madt->header.length; /* Parse all entries looking for a match. */ entry += sizeof(struct acpi_table_madt); while (entry + sizeof(struct acpi_subtable_header) < madt_end) { struct acpi_subtable_header *header = (struct acpi_subtable_header *)entry; if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { if (!map_lapic_id(header, acpi_id, &phys_id)) break; } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { if (!map_x2apic_id(header, type, acpi_id, &phys_id)) break; } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { if (!map_lsapic_id(header, type, acpi_id, &phys_id)) break; } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { if (!map_gicc_mpidr(header, type, acpi_id, &phys_id)) break; } entry += header->length; } return phys_id; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Chiang15977.94%228.57%
Hanjun Guo3718.14%342.86%
David Daney52.45%114.29%
Catalin Marinas31.47%114.29%
Total204100.00%7100.00%


phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id) { struct acpi_table_madt *madt = NULL; phys_cpuid_t rv; acpi_get_table(ACPI_SIG_MADT, 0, (struct acpi_table_header **)&madt); if (!madt) return PHYS_CPUID_INVALID; rv = map_madt_entry(madt, 1, acpi_id); acpi_put_table((struct acpi_table_header *)madt); return rv; }

Contributors

PersonTokensPropCommitsCommitProp
David Daney6089.55%150.00%
Lv Zheng710.45%150.00%
Total67100.00%2100.00%


static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; struct acpi_subtable_header *header; phys_cpuid_t phys_id = PHYS_CPUID_INVALID; if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) goto exit; if (!buffer.length || !buffer.pointer) goto exit; obj = buffer.pointer; if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < sizeof(struct acpi_subtable_header)) { goto exit; } header = (struct acpi_subtable_header *)obj->buffer.pointer; if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) map_lapic_id(header, acpi_id, &phys_id); else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) map_lsapic_id(header, type, acpi_id, &phys_id); else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) map_x2apic_id(header, type, acpi_id, &phys_id); else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) map_gicc_mpidr(header, type, acpi_id, &phys_id); exit: kfree(buffer.pointer); return phys_id; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Chiang16376.89%120.00%
Hanjun Guo4621.70%360.00%
Catalin Marinas31.42%120.00%
Total212100.00%5100.00%


phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) { phys_cpuid_t phys_id; phys_id = map_mat_entry(handle, type, acpi_id); if (invalid_phys_cpuid(phys_id)) phys_id = map_madt_entry(get_madt_table(), type, acpi_id); return phys_id; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Chiang3366.00%114.29%
Hanjun Guo816.00%228.57%
David Daney36.00%114.29%
Jiang Liu36.00%114.29%
Catalin Marinas24.00%114.29%
Dou Liyang12.00%114.29%
Total50100.00%7100.00%


int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id) { #ifdef CONFIG_SMP int i; #endif if (invalid_phys_cpuid(phys_id)) { /* * On UP processor, there is no _MAT or MADT table. * So above phys_id is always set to PHYS_CPUID_INVALID. * * BIOS may define multiple CPU handles even for UP processor. * For example, * * Scope (_PR) * { * Processor (CPU0, 0x00, 0x00000410, 0x06) {} * Processor (CPU1, 0x01, 0x00000410, 0x06) {} * Processor (CPU2, 0x02, 0x00000410, 0x06) {} * Processor (CPU3, 0x03, 0x00000410, 0x06) {} * } * * Ignores phys_id and always returns 0 for the processor * handle with acpi id 0 if nr_cpu_ids is 1. * This should be the case if SMP tables are not found. * Return -EINVAL for other CPU's handle. */ if (nr_cpu_ids <= 1 && acpi_id == 0) return acpi_id; else return -EINVAL; } #ifdef CONFIG_SMP for_each_possible_cpu(i) { if (cpu_physical_id(i) == phys_id) return i; } #else /* In UP kernel, only processor 0 is valid */ if (phys_id == 0) return phys_id; #endif return -ENODEV; }

Contributors

PersonTokensPropCommitsCommitProp
Lin Ming2731.40%222.22%
Alexander Chiang2630.23%111.11%
Jiang Liu1618.60%111.11%
Hanjun Guo1112.79%333.33%
Thomas Renninger44.65%111.11%
Catalin Marinas22.33%111.11%
Total86100.00%9100.00%


int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) { phys_cpuid_t phys_id; phys_id = acpi_get_phys_id(handle, type, acpi_id); return acpi_map_cpuid(phys_id, acpi_id); }

Contributors

PersonTokensPropCommitsCommitProp
Jiang Liu3186.11%133.33%
Hanjun Guo411.11%133.33%
Catalin Marinas12.78%133.33%
Total36100.00%3100.00%

EXPORT_SYMBOL_GPL(acpi_get_cpuid); #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, u64 *phys_addr, int *ioapic_id) { struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; if (ioapic->global_irq_base != gsi_base) return 0; *phys_addr = ioapic->address; *ioapic_id = ioapic->id; return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu62100.00%1100.00%
Total62100.00%1100.00%


static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) { struct acpi_subtable_header *hdr; unsigned long madt_end, entry; struct acpi_table_madt *madt; int apic_id = -1; madt = get_madt_table(); if (!madt) return apic_id; entry = (unsigned long)madt; madt_end = entry + madt->header.length; /* Parse all entries looking for a match. */ entry += sizeof(struct acpi_table_madt); while (entry + sizeof(struct acpi_subtable_header) < madt_end) { hdr = (struct acpi_subtable_header *)entry; if (hdr->type == ACPI_MADT_TYPE_IO_APIC && get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) break; else entry += hdr->length; } return apic_id; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu129100.00%1100.00%
Total129100.00%1100.00%


static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, u64 *phys_addr) { struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_subtable_header *header; union acpi_object *obj; int apic_id = -1; if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) goto exit; if (!buffer.length || !buffer.pointer) goto exit; obj = buffer.pointer; if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < sizeof(struct acpi_subtable_header)) goto exit; header = (struct acpi_subtable_header *)obj->buffer.pointer; if (header->type == ACPI_MADT_TYPE_IO_APIC) get_ioapic_id(header, gsi_base, phys_addr, &apic_id); exit: kfree(buffer.pointer); return apic_id; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu151100.00%1100.00%
Total151100.00%1100.00%

/** * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base * @handle: ACPI object for IOAPIC device * @gsi_base: GSI base to match with * @phys_addr: Pointer to store physical address of matching IOAPIC record * * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search * for an ACPI IOAPIC record matching @gsi_base. * Return IOAPIC id and store physical address in @phys_addr if found a match, * otherwise return <0. */
int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) { int apic_id; apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); if (apic_id == -1) apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); return apic_id; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu48100.00%1100.00%
Total48100.00%1100.00%

#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */

Overall Contributors

PersonTokensPropCommitsCommitProp
Alexander Chiang61841.93%728.00%
Yinghai Lu45630.94%14.00%
Hanjun Guo20413.84%624.00%
David Daney684.61%14.00%
Jiang Liu503.39%14.00%
Lin Ming271.83%28.00%
Fabian Frederick211.42%14.00%
Catalin Marinas140.95%14.00%
Lv Zheng80.54%28.00%
Thomas Renninger40.27%14.00%
Paul Gortmaker30.20%14.00%
Dou Liyang10.07%14.00%
Total1474100.00%25100.00%
Directory: drivers/acpi
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.