From 020295b4cb5b7d510ea1f4531a502c3f8a2380c5 Mon Sep 17 00:00:00 2001 From: Hanjun Guo Date: Tue, 24 Mar 2015 14:02:47 +0000 Subject: [PATCH] ACPI / processor: Make it possible to get CPU hardware ID via GICC Introduce a new function map_gicc_mpidr() to allow MPIDRs to be obtained from the GICC Structure introduced by ACPI 5.1, since MPIDR for ARM64 is 64-bit, so typedef u64 for phys_cpuid_t. The ARM architecture defines the MPIDR register as the CPU hardware identifier. This patch adds the code infrastructure to retrieve the MPIDR values from the ARM ACPI GICC structure in order to look-up the kernel CPU hardware ids required by the ACPI core code to identify CPUs. CC: Rafael J. Wysocki CC: Catalin Marinas CC: Will Deacon Tested-by: Suravee Suthikulpanit Tested-by: Yijing Wang Tested-by: Mark Langsdorf Tested-by: Jon Masters Tested-by: Timur Tabi Tested-by: Robert Richter Acked-by: Robert Richter Acked-by: Lorenzo Pieralisi Acked-by: Rafael J. Wysocki Reviewed-by: Grant Likely Signed-off-by: Hanjun Guo Signed-off-by: Will Deacon --- arch/arm64/include/asm/acpi.h | 12 ++++++++++++ drivers/acpi/processor_core.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index 9719921..eea0bc3 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -13,6 +13,8 @@ #define _ASM_ACPI_H #include +#include +#include /* Basic configuration for ACPI */ #ifdef CONFIG_ACPI @@ -27,6 +29,9 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, } #define acpi_os_ioremap acpi_os_ioremap +typedef u64 phys_cpuid_t; +#define PHYS_CPUID_INVALID INVALID_HWID + #define acpi_strict 1 /* No out-of-spec workarounds on ARM64 */ extern int acpi_disabled; extern int acpi_noirq; @@ -59,6 +64,13 @@ static inline void enable_acpi(void) } /* + * The ACPI processor driver for ACPI core code needs this macro + * to find out this cpu was already mapped (mapping from CPU hardware + * ID to CPU logical ID) or not. + */ +#define cpu_physical_id(cpu) cpu_logical_map(cpu) + +/* * It's used from ACPI core in kdump to boot UP system with SMP kernel, * with this check the ACPI core will not override the CPU index * obtained from GICC with 0 and not print some error message as well. diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 51cc299..b1ec78b 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -83,6 +83,31 @@ static int map_lsapic_id(struct acpi_subtable_header *entry, return 0; } +/* + * 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; +} + static phys_cpuid_t map_madt_entry(int type, u32 acpi_id) { unsigned long madt_end, entry; @@ -111,6 +136,9 @@ static phys_cpuid_t map_madt_entry(int type, u32 acpi_id) } 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; } @@ -143,6 +171,8 @@ static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 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); -- 2.7.4