diff options
Diffstat (limited to 'arch/riscv/kernel/acpi.c')
| -rw-r--r-- | arch/riscv/kernel/acpi.c | 144 |
1 files changed, 116 insertions, 28 deletions
diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c index 5ee03ebab80e..71698ee11621 100644 --- a/arch/riscv/kernel/acpi.c +++ b/arch/riscv/kernel/acpi.c @@ -14,9 +14,13 @@ */ #include <linux/acpi.h> +#include <linux/efi-bgrt.h> +#include <linux/efi.h> #include <linux/io.h> +#include <linux/memblock.h> +#include <linux/of_fdt.h> #include <linux/pci.h> -#include <linux/efi.h> +#include <linux/serial_core.h> int acpi_noirq = 1; /* skip ACPI IRQ initialization */ int acpi_disabled = 1; @@ -130,7 +134,7 @@ void __init acpi_boot_table_init(void) if (param_acpi_off || (!param_acpi_on && !param_acpi_force && efi.acpi20 == EFI_INVALID_TABLE_ADDR)) - return; + goto done; /* * ACPI is disabled at this point. Enable it in order to parse @@ -150,6 +154,16 @@ void __init acpi_boot_table_init(void) if (!param_acpi_force) disable_acpi(); } + +done: + if (acpi_disabled) { + if (earlycon_acpi_spcr_enable) + early_init_dt_scan_chosen_stdout(); + } else { + acpi_parse_spcr(earlycon_acpi_spcr_enable, true); + if (IS_ENABLED(CONFIG_ACPI_BGRT)) + acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt); + } } static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end) @@ -190,11 +204,6 @@ struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu) return &cpu_madt_rintc[cpu]; } -u32 get_acpi_id_for_cpu(int cpu) -{ - return acpi_cpu_get_madt_rintc(cpu)->uid; -} - /* * __acpi_map_table() will be called before paging_init(), so early_ioremap() * or early_memremap() should be called here to for ACPI table mapping. @@ -204,7 +213,7 @@ void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size) if (!size) return NULL; - return early_ioremap(phys, size); + return early_memremap(phys, size); } void __init __acpi_unmap_table(void __iomem *map, unsigned long size) @@ -212,40 +221,119 @@ void __init __acpi_unmap_table(void __iomem *map, unsigned long size) if (!map || !size) return; - early_iounmap(map, size); + early_memunmap(map, size); } -void *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) +void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) { - return 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, prot); } #ifdef CONFIG_PCI /* - * These interfaces are defined just to enable building ACPI core. - * TODO: Update it with actual implementation when external interrupt - * controller support is added in RISC-V ACPI. + * raw_pci_read/write - Platform-specific PCI config space access. */ -int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn, - int reg, int len, u32 *val) +int raw_pci_read(unsigned int domain, unsigned int bus, + unsigned int devfn, int reg, int len, u32 *val) { - return PCIBIOS_DEVICE_NOT_FOUND; -} + struct pci_bus *b = pci_find_bus(domain, bus); -int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn, - int reg, int len, u32 val) -{ - return PCIBIOS_DEVICE_NOT_FOUND; + if (!b) + return PCIBIOS_DEVICE_NOT_FOUND; + return b->ops->read(b, devfn, reg, len, val); } -int acpi_pci_bus_find_domain_nr(struct pci_bus *bus) +int raw_pci_write(unsigned int domain, unsigned int bus, + unsigned int devfn, int reg, int len, u32 val) { - return -1; -} + struct pci_bus *b = pci_find_bus(domain, bus); -struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) -{ - return NULL; + if (!b) + return PCIBIOS_DEVICE_NOT_FOUND; + return b->ops->write(b, devfn, reg, len, val); } + #endif /* CONFIG_PCI */ |