LoongArch inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5OHOB
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Signed-off-by: liuyun liuyun@loongson.cn Signed-off-by: yangyinglu yangyinglu@loongson.cn --- arch/loongarch/kernel/efi.c | 164 +++++++++++++++++++++++++++++++++++- 1 file changed, 163 insertions(+), 1 deletion(-)
diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c index 3d448fef3af4..0ae39546360f 100644 --- a/arch/loongarch/kernel/efi.c +++ b/arch/loongarch/kernel/efi.c @@ -22,13 +22,16 @@
#include <asm/early_ioremap.h> #include <asm/efi.h> +#include <asm/tlb.h> #include <asm/loongson.h> +#include <asm/pgalloc.h>
static unsigned long efi_nr_tables; static unsigned long efi_config_table;
static unsigned long __initdata boot_memmap = EFI_INVALID_TABLE_ADDR; static unsigned long __initdata fdt_pointer = EFI_INVALID_TABLE_ADDR; +static __initdata pgd_t *pgd_efi;
static efi_system_table_t *efi_systab; static efi_config_table_type_t arch_tables[] __initdata = { @@ -48,8 +51,163 @@ void __init *efi_fdt_pointer(void) return early_memremap_ro(fdt_pointer, SZ_64K); }
+static int __init efimap_populate_hugepages( + unsigned long start, unsigned long end, + pgprot_t prot) +{ + unsigned long addr; + unsigned long next; + pmd_t entry; + pud_t *pud; + pmd_t *pmd; + + for (addr = start; addr < end; addr = next) { + next = pmd_addr_end(addr, end); + pud = pud_offset((p4d_t *)pgd_efi + pgd_index(addr), addr); + if (pud_none(*pud)) { + void *p = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); + if (!p) + return -1; + pmd_init(p); + pud_populate(&init_mm, pud, p); + } + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) { + entry = pfn_pmd((addr >> PAGE_SHIFT), prot); + entry = pmd_mkhuge(entry); + set_pmd_at(&init_mm, addr, pmd, entry); + } + } + return 0; +} + +static void __init efi_map_pgt(void) +{ + unsigned long node; + unsigned long start, end; + unsigned long start_pfn, end_pfn; + + pgd_efi = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); + if (!pgd_efi) { + pr_err("alloc efi pgd failed!\n"); + return; + } + pgd_init(pgd_efi); + csr_write64((long)pgd_efi, LOONGARCH_CSR_PGDL); + + /* Low Memory, Cached */ + efimap_populate_hugepages(0, SZ_256M, PAGE_KERNEL); + + for_each_node_mask(node, node_possible_map) { + /* MMIO Registers, Uncached */ + efimap_populate_hugepages(SZ_256M | (node << 44), + SZ_512M | (node << 44), PAGE_KERNEL_SUC); + + get_pfn_range_for_nid(node, &start_pfn, &end_pfn); + start = ALIGN_DOWN(start_pfn << PAGE_SHIFT, PMD_SIZE); + end = ALIGN(end_pfn << PAGE_SHIFT, PMD_SIZE); + + /* System memory, Cached */ + efimap_populate_hugepages(node ? start : SZ_512M, end, PAGE_KERNEL); + } +} + +static int __init efimap_free_pgt(unsigned long start, unsigned long end) +{ + unsigned long addr; + unsigned long next; + pud_t *pud; + pmd_t *pmd; + + for (addr = start; addr < end; addr = next) { + next = pmd_addr_end(addr, end); + + pud = pud_offset((p4d_t *)pgd_efi + pgd_index(addr), addr); + if (!pud_present(*pud)) + continue; + pmd = pmd_offset(pud, addr); + memblock_free(pmd, PAGE_SIZE); + pud_clear(pud); + } + return 0; +} + +static void __init efi_unmap_pgt(void) +{ + unsigned long node; + unsigned long start, end; + unsigned long start_pfn, end_pfn; + + for_each_node_mask(node, node_possible_map) { + get_pfn_range_for_nid(node, &start_pfn, &end_pfn); + start = ALIGN_DOWN(start_pfn << PAGE_SHIFT, PMD_SIZE); + end = ALIGN(end_pfn << PAGE_SHIFT, PMD_SIZE); + + /* Free pagetable memory */ + efimap_free_pgt(start, end); + } + + memblock_free(pgd_efi, PAGE_SIZE); + csr_write64((long)invalid_pg_dir, LOONGARCH_CSR_PGDL); + local_flush_tlb_all(); + + return; +} + +/* + * set_virtual_map() - create a virtual mapping for the EFI memory map and call + * efi_set_virtual_address_map enter virtual for runtime service + * + * This function populates the virt_addr fields of all memory region descriptors + * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors + * are also copied to @runtime_map, and their total count is returned in @count. + */ +static int __init set_virtual_map(void) +{ + efi_status_t status; + int count = 0; + unsigned int size; + unsigned long attr; + efi_runtime_services_t *rt; + efi_set_virtual_address_map_t *svam; + efi_memory_desc_t *in, runtime_map[32]; + + size = sizeof(efi_memory_desc_t); + + for_each_efi_memory_desc(in) { + attr = in->attribute; + if (!(attr & EFI_MEMORY_RUNTIME)) + continue; + + if (attr & (EFI_MEMORY_WB | EFI_MEMORY_WT)) + in->virt_addr = TO_CACHE(in->phys_addr); + else + in->virt_addr = TO_UNCACHE(in->phys_addr); + + memcpy(&runtime_map[count++], in, size); + } + + rt = early_memremap_ro((unsigned long)efi_systab->runtime, sizeof(*rt)); + + /* Install the new virtual address map */ + svam = rt->set_virtual_address_map; + + efi_map_pgt(); + + status = svam(size * count, size, efi.memmap.desc_version, + (efi_memory_desc_t *)TO_PHYS((unsigned long)runtime_map)); + + efi_unmap_pgt(); + if (status != EFI_SUCCESS) + return -1; + + return 0; +} + void __init efi_runtime_init(void) { + efi_status_t status; + if (!efi_enabled(EFI_BOOT) || !efi_systab->runtime) return;
@@ -58,7 +216,11 @@ void __init efi_runtime_init(void) return; }
- efi.runtime = (efi_runtime_services_t *)efi_systab->runtime; + status = set_virtual_map(); + if (status < 0) + return; + + efi.runtime = READ_ONCE(efi_systab->runtime); efi.runtime_version = (unsigned int)efi.runtime->hdr.revision;
efi_native_runtime_setup();