diff options
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/Kconfig | 1 | ||||
| -rw-r--r-- | arch/riscv/include/asm/acpi.h | 6 | ||||
| -rw-r--r-- | arch/riscv/kernel/acpi.c | 87 | ||||
| -rw-r--r-- | arch/riscv/mm/cacheflush.c | 25 |
4 files changed, 111 insertions, 8 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index d607ab0f7c6d..805c8ab7f23b 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -39,6 +39,7 @@ config RISCV select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_VDSO_DATA + select ARCH_KEEP_MEMBLOCK if ACPI select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT select ARCH_STACKWALK diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h index d5604d2073bc..7dad0cf9d701 100644 --- a/arch/riscv/include/asm/acpi.h +++ b/arch/riscv/include/asm/acpi.h @@ -66,6 +66,8 @@ int acpi_get_riscv_isa(struct acpi_table_header *table, unsigned int cpu, const char **isa); static inline int acpi_numa_get_nid(unsigned int cpu) { return NUMA_NO_NODE; } +void acpi_get_cbo_block_size(struct acpi_table_header *table, u32 *cbom_size, + u32 *cboz_size, u32 *cbop_size); #else static inline void acpi_init_rintc_map(void) { } static inline struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu) @@ -79,6 +81,10 @@ static inline int acpi_get_riscv_isa(struct acpi_table_header *table, return -EINVAL; } +static inline void acpi_get_cbo_block_size(struct acpi_table_header *table, + u32 *cbom_size, u32 *cboz_size, + u32 *cbop_size) { } + #endif /* CONFIG_ACPI */ #endif /*_ASM_ACPI_H*/ diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c index 56cb2c986c48..e619edc8b0cc 100644 --- a/arch/riscv/kernel/acpi.c +++ b/arch/riscv/kernel/acpi.c @@ -14,9 +14,10 @@ */ #include <linux/acpi.h> +#include <linux/efi.h> #include <linux/io.h> +#include <linux/memblock.h> #include <linux/pci.h> -#include <linux/efi.h> int acpi_noirq = 1; /* skip ACPI IRQ initialization */ int acpi_disabled = 1; @@ -217,7 +218,89 @@ void __init __acpi_unmap_table(void __iomem *map, unsigned long size) void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) { - return (void __iomem *)memremap(phys, size, MEMREMAP_WB); + efi_memory_desc_t *md, *region = NULL; + pgprot_t prot; + + if (WARN_ON_ONCE(!efi_enabled(EFI_MEMMAP))) + return NULL; + + for_each_efi_memory_desc(md) { + u64 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT); + + if (phys < md->phys_addr || phys >= end) + continue; + + if (phys + size > end) { + pr_warn(FW_BUG "requested region covers multiple EFI memory regions\n"); + return NULL; + } + region = md; + break; + } + + /* + * It is fine for AML to remap regions that are not represented in the + * EFI memory map at all, as it only describes normal memory, and MMIO + * regions that require a virtual mapping to make them accessible to + * the EFI runtime services. + */ + prot = PAGE_KERNEL_IO; + if (region) { + switch (region->type) { + case EFI_LOADER_CODE: + case EFI_LOADER_DATA: + case EFI_BOOT_SERVICES_CODE: + case EFI_BOOT_SERVICES_DATA: + case EFI_CONVENTIONAL_MEMORY: + case EFI_PERSISTENT_MEMORY: + if (memblock_is_map_memory(phys) || + !memblock_is_region_memory(phys, size)) { + pr_warn(FW_BUG "requested region covers kernel memory\n"); + return NULL; + } + + /* + * Mapping kernel memory is permitted if the region in + * question is covered by a single memblock with the + * NOMAP attribute set: this enables the use of ACPI + * table overrides passed via initramfs. + * This particular use case only requires read access. + */ + fallthrough; + + case EFI_RUNTIME_SERVICES_CODE: + /* + * This would be unusual, but not problematic per se, + * as long as we take care not to create a writable + * mapping for executable code. + */ + prot = PAGE_KERNEL_RO; + break; + + case EFI_ACPI_RECLAIM_MEMORY: + /* + * ACPI reclaim memory is used to pass firmware tables + * and other data that is intended for consumption by + * the OS only, which may decide it wants to reclaim + * that memory and use it for something else. We never + * do that, but we usually add it to the linear map + * anyway, in which case we should use the existing + * mapping. + */ + if (memblock_is_map_memory(phys)) + return (void __iomem *)__va(phys); + fallthrough; + + default: + if (region->attribute & EFI_MEMORY_WB) + prot = PAGE_KERNEL; + else if ((region->attribute & EFI_MEMORY_WC) || + (region->attribute & EFI_MEMORY_WT)) + prot = pgprot_writecombine(PAGE_KERNEL); + } + } + + return ioremap_prot(phys, size, pgprot_val(prot)); } #ifdef CONFIG_PCI diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c index f1387272a551..55a34f2020a8 100644 --- a/arch/riscv/mm/cacheflush.c +++ b/arch/riscv/mm/cacheflush.c @@ -3,7 +3,9 @@ * Copyright (C) 2017 SiFive */ +#include <linux/acpi.h> #include <linux/of.h> +#include <asm/acpi.h> #include <asm/cacheflush.h> #ifdef CONFIG_SMP @@ -124,13 +126,24 @@ void __init riscv_init_cbo_blocksizes(void) unsigned long cbom_hartid, cboz_hartid; u32 cbom_block_size = 0, cboz_block_size = 0; struct device_node *node; + struct acpi_table_header *rhct; + acpi_status status; + + if (acpi_disabled) { + for_each_of_cpu_node(node) { + /* set block-size for cbom and/or cboz extension if available */ + cbo_get_block_size(node, "riscv,cbom-block-size", + &cbom_block_size, &cbom_hartid); + cbo_get_block_size(node, "riscv,cboz-block-size", + &cboz_block_size, &cboz_hartid); + } + } else { + status = acpi_get_table(ACPI_SIG_RHCT, 0, &rhct); + if (ACPI_FAILURE(status)) + return; - for_each_of_cpu_node(node) { - /* set block-size for cbom and/or cboz extension if available */ - cbo_get_block_size(node, "riscv,cbom-block-size", - &cbom_block_size, &cbom_hartid); - cbo_get_block_size(node, "riscv,cboz-block-size", - &cboz_block_size, &cboz_hartid); + acpi_get_cbo_block_size(rhct, &cbom_block_size, &cboz_block_size, NULL); + acpi_put_table((struct acpi_table_header *)rhct); } if (cbom_block_size) |