diff options
Diffstat (limited to 'arch/riscv/mm/init.c')
| -rw-r--r-- | arch/riscv/mm/init.c | 1792 |
1 files changed, 1557 insertions, 235 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 69f6678db7f3..ab475ec6ca42 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -2,6 +2,8 @@ /* * Copyright (C) 2012 Regents of the University of California * Copyright (C) 2019 Western Digital Corporation or its affiliates. + * Copyright (C) 2020 FORTH-ICS/CARV + * Nick Kossifidis <mick@ics.forth.gr> */ #include <linux/init.h> @@ -9,187 +11,387 @@ #include <linux/memblock.h> #include <linux/initrd.h> #include <linux/swap.h> +#include <linux/swiotlb.h> #include <linux/sizes.h> #include <linux/of_fdt.h> +#include <linux/of_reserved_mem.h> #include <linux/libfdt.h> +#include <linux/set_memory.h> +#include <linux/dma-map-ops.h> +#include <linux/crash_dump.h> +#include <linux/hugetlb.h> +#include <linux/kfence.h> +#include <linux/execmem.h> #include <asm/fixmap.h> -#include <asm/tlbflush.h> -#include <asm/sections.h> -#include <asm/pgtable.h> #include <asm/io.h> +#include <asm/kasan.h> +#include <asm/module.h> +#include <asm/numa.h> +#include <asm/pgtable.h> +#include <asm/sections.h> +#include <asm/soc.h> +#include <asm/sparsemem.h> +#include <asm/tlbflush.h> #include "../kernel/head.h" +u64 new_vmalloc[NR_CPUS / sizeof(u64) + 1]; + +struct kernel_mapping kernel_map __ro_after_init; +EXPORT_SYMBOL(kernel_map); +#ifdef CONFIG_XIP_KERNEL +#define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) +#endif + +#ifdef CONFIG_64BIT +u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39; +#else +u64 satp_mode __ro_after_init = SATP_MODE_32; +#endif +EXPORT_SYMBOL(satp_mode); + +#ifdef CONFIG_64BIT +bool pgtable_l4_enabled __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL); +bool pgtable_l5_enabled __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL); +EXPORT_SYMBOL(pgtable_l4_enabled); +EXPORT_SYMBOL(pgtable_l5_enabled); +#endif + +phys_addr_t phys_ram_base __ro_after_init; +EXPORT_SYMBOL(phys_ram_base); + +#ifdef CONFIG_SPARSEMEM_VMEMMAP +#define VMEMMAP_ADDR_ALIGN (1ULL << SECTION_SIZE_BITS) + +unsigned long vmemmap_start_pfn __ro_after_init; +EXPORT_SYMBOL(vmemmap_start_pfn); +#endif + unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; EXPORT_SYMBOL(empty_zero_page); extern char _start[]; -void *dtb_early_va; +void *_dtb_early_va __initdata; +uintptr_t _dtb_early_pa __initdata; + +phys_addr_t dma32_phys_limit __initdata; static void __init zone_sizes_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; #ifdef CONFIG_ZONE_DMA32 - max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, - (unsigned long) PFN_PHYS(max_low_pfn))); + max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); #endif max_zone_pfns[ZONE_NORMAL] = max_low_pfn; - free_area_init_nodes(max_zone_pfns); + free_area_init(max_zone_pfns); } -static void setup_zero_page(void) -{ - memset((void *)empty_zero_page, 0, PAGE_SIZE); -} +#if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) + +#define LOG2_SZ_1K ilog2(SZ_1K) +#define LOG2_SZ_1M ilog2(SZ_1M) +#define LOG2_SZ_1G ilog2(SZ_1G) +#define LOG2_SZ_1T ilog2(SZ_1T) -#ifdef CONFIG_DEBUG_VM static inline void print_mlk(char *name, unsigned long b, unsigned long t) { pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, - (((t) - (b)) >> 10)); + (((t) - (b)) >> LOG2_SZ_1K)); } static inline void print_mlm(char *name, unsigned long b, unsigned long t) { pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, - (((t) - (b)) >> 20)); + (((t) - (b)) >> LOG2_SZ_1M)); +} + +static inline void print_mlg(char *name, unsigned long b, unsigned long t) +{ + pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t, + (((t) - (b)) >> LOG2_SZ_1G)); +} + +#ifdef CONFIG_64BIT +static inline void print_mlt(char *name, unsigned long b, unsigned long t) +{ + pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t, + (((t) - (b)) >> LOG2_SZ_1T)); +} +#else +#define print_mlt(n, b, t) do {} while (0) +#endif + +static inline void print_ml(char *name, unsigned long b, unsigned long t) +{ + unsigned long diff = t - b; + + if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10) + print_mlt(name, b, t); + else if ((diff >> LOG2_SZ_1G) >= 10) + print_mlg(name, b, t); + else if ((diff >> LOG2_SZ_1M) >= 10) + print_mlm(name, b, t); + else + print_mlk(name, b, t); } -static void print_vm_layout(void) +static void __init print_vm_layout(void) { pr_notice("Virtual kernel memory layout:\n"); - print_mlk("fixmap", (unsigned long)FIXADDR_START, - (unsigned long)FIXADDR_TOP); - print_mlm("pci io", (unsigned long)PCI_IO_START, - (unsigned long)PCI_IO_END); - print_mlm("vmemmap", (unsigned long)VMEMMAP_START, - (unsigned long)VMEMMAP_END); - print_mlm("vmalloc", (unsigned long)VMALLOC_START, - (unsigned long)VMALLOC_END); - print_mlm("lowmem", (unsigned long)PAGE_OFFSET, - (unsigned long)high_memory); + print_ml("fixmap", (unsigned long)FIXADDR_START, + (unsigned long)FIXADDR_TOP); + print_ml("pci io", (unsigned long)PCI_IO_START, + (unsigned long)PCI_IO_END); + print_ml("vmemmap", (unsigned long)VMEMMAP_START, + (unsigned long)VMEMMAP_END); + print_ml("vmalloc", (unsigned long)VMALLOC_START, + (unsigned long)VMALLOC_END); +#ifdef CONFIG_64BIT + print_ml("modules", (unsigned long)MODULES_VADDR, + (unsigned long)MODULES_END); +#endif + print_ml("lowmem", (unsigned long)PAGE_OFFSET, + (unsigned long)high_memory); + if (IS_ENABLED(CONFIG_64BIT)) { +#ifdef CONFIG_KASAN + print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); +#endif + + print_ml("kernel", (unsigned long)kernel_map.virt_addr, + (unsigned long)ADDRESS_SPACE_END); + } } #else static void print_vm_layout(void) { } #endif /* CONFIG_DEBUG_VM */ -void __init mem_init(void) +void __init arch_mm_preinit(void) { + bool swiotlb = max_pfn > PFN_DOWN(dma32_phys_limit); #ifdef CONFIG_FLATMEM BUG_ON(!mem_map); #endif /* CONFIG_FLATMEM */ - high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); - memblock_free_all(); + if (IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) && !swiotlb && + dma_cache_alignment != 1) { + /* + * If no bouncing needed for ZONE_DMA, allocate 1MB swiotlb + * buffer per 1GB of RAM for kmalloc() bouncing on + * non-coherent platforms. + */ + unsigned long size = + DIV_ROUND_UP(memblock_phys_mem_size(), 1024); + swiotlb_adjust_size(min(swiotlb_size_or_default(), size)); + swiotlb = true; + } + + swiotlb_init(swiotlb, SWIOTLB_VERBOSE); - mem_init_print_info(NULL); print_vm_layout(); } -#ifdef CONFIG_BLK_DEV_INITRD -static void __init setup_initrd(void) +/* Limit the memory size via mem. */ +static phys_addr_t memory_limit; +#ifdef CONFIG_XIP_KERNEL +#define memory_limit (*(phys_addr_t *)XIP_FIXUP(&memory_limit)) +#endif /* CONFIG_XIP_KERNEL */ + +static int __init early_mem(char *p) { - unsigned long size; + u64 size; - if (initrd_start >= initrd_end) { - pr_info("initrd not found or empty"); - goto disable; - } - if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { - pr_err("initrd extends beyond end of memory"); - goto disable; - } + if (!p) + return 1; - size = initrd_end - initrd_start; - memblock_reserve(__pa(initrd_start), size); - initrd_below_start_ok = 1; + size = memparse(p, &p) & PAGE_MASK; + memory_limit = min_t(u64, size, memory_limit); - pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n", - (void *)(initrd_start), size); - return; -disable: - pr_cont(" - disabling initrd\n"); - initrd_start = 0; - initrd_end = 0; -} -#endif /* CONFIG_BLK_DEV_INITRD */ + pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); -static phys_addr_t dtb_early_pa __initdata; + return 0; +} +early_param("mem", early_mem); -void __init setup_bootmem(void) +static void __init setup_bootmem(void) { - struct memblock_region *reg; - phys_addr_t mem_size = 0; - phys_addr_t vmlinux_end = __pa(&_end); - phys_addr_t vmlinux_start = __pa(&_start); + phys_addr_t vmlinux_end = __pa_symbol(&_end); + phys_addr_t max_mapped_addr; + phys_addr_t phys_ram_end, vmlinux_start; - /* Find the memory region containing the kernel */ - for_each_memblock(memory, reg) { - phys_addr_t end = reg->base + reg->size; + if (IS_ENABLED(CONFIG_XIP_KERNEL)) + vmlinux_start = __pa_symbol(&_sdata); + else + vmlinux_start = __pa_symbol(&_start); - if (reg->base <= vmlinux_end && vmlinux_end <= end) { - mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); + memblock_enforce_memory_limit(memory_limit); - /* - * Remove memblock from the end of usable area to the - * end of region - */ - if (reg->base + mem_size < end) - memblock_remove(reg->base + mem_size, - end - reg->base - mem_size); + /* + * Make sure we align the reservation on PMD_SIZE since we will + * map the kernel in the linear mapping as read-only: we do not want + * any allocation to happen between _end and the next pmd aligned page. + */ + if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) + vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; + /* + * Reserve from the start of the kernel to the end of the kernel + */ + memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); + + /* + * Make sure we align the start of the memory on a PMD boundary so that + * at worst, we map the linear mapping with PMD mappings. + */ + if (!IS_ENABLED(CONFIG_XIP_KERNEL)) { + phys_ram_base = memblock_start_of_DRAM() & PMD_MASK; +#ifdef CONFIG_SPARSEMEM_VMEMMAP + vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT; +#endif + } + + /* + * In 64-bit, any use of __va/__pa before this point is wrong as we + * did not know the start of DRAM before. + */ + if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) + kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base; + + /* + * The size of the linear page mapping may restrict the amount of + * usable RAM. + */ + if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) { + max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE; + if (memblock_end_of_DRAM() > max_mapped_addr) { + memblock_cap_memory_range(phys_ram_base, + max_mapped_addr - phys_ram_base); + pr_warn("Physical memory overflows the linear mapping size: region above %pa removed", + &max_mapped_addr); } } - BUG_ON(mem_size == 0); - /* Reserve from the start of the kernel to the end of the kernel */ - memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); + /* + * Reserve physical address space that would be mapped to virtual + * addresses greater than (void *)(-PAGE_SIZE) because: + * - This memory would overlap with ERR_PTR + * - This memory belongs to high memory, which is not supported + * + * This is not applicable to 64-bit kernel, because virtual addresses + * after (void *)(-PAGE_SIZE) are not linearly mapped: they are + * occupied by kernel mapping. Also it is unrealistic for high memory + * to exist on 64-bit platforms. + */ + if (!IS_ENABLED(CONFIG_64BIT)) { + max_mapped_addr = __va_to_pa_nodebug(-PAGE_SIZE); + memblock_reserve(max_mapped_addr, (phys_addr_t)-max_mapped_addr); + } - set_max_mapnr(PFN_DOWN(mem_size)); - max_low_pfn = PFN_DOWN(memblock_end_of_DRAM()); + phys_ram_end = memblock_end_of_DRAM(); + min_low_pfn = PFN_UP(phys_ram_base); + max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end); -#ifdef CONFIG_BLK_DEV_INITRD - setup_initrd(); -#endif /* CONFIG_BLK_DEV_INITRD */ + dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); + + reserve_initrd_mem(); + + /* + * No allocation should be done before reserving the memory as defined + * in the device tree, otherwise the allocation could end up in a + * reserved region. + */ + early_init_fdt_scan_reserved_mem(); /* - * Avoid using early_init_fdt_reserve_self() since __pa() does + * If DTB is built in, no need to reserve its memblock. + * Otherwise, do reserve it but avoid using + * early_init_fdt_reserve_self() since __pa() does * not work for DTB pointers that are fixmap addresses */ - memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); + if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) + memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); - early_init_fdt_scan_reserved_mem(); - memblock_allow_resize(); - memblock_dump_all(); + dma_contiguous_reserve(dma32_phys_limit); + if (IS_ENABLED(CONFIG_64BIT)) + hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); +} - for_each_memblock(memory, reg) { - unsigned long start_pfn = memblock_region_memory_base_pfn(reg); - unsigned long end_pfn = memblock_region_memory_end_pfn(reg); +#ifdef CONFIG_RELOCATABLE +extern unsigned long __rela_dyn_start, __rela_dyn_end; - memblock_set_node(PFN_PHYS(start_pfn), - PFN_PHYS(end_pfn - start_pfn), - &memblock.memory, 0); +static void __init relocate_kernel(void) +{ + Elf_Rela *rela = (Elf_Rela *)&__rela_dyn_start; + /* + * This holds the offset between the linked virtual address and the + * relocated virtual address. + */ + uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR; + /* + * This holds the offset between kernel linked virtual address and + * physical address. + */ + uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr; + + for ( ; rela < (Elf_Rela *)&__rela_dyn_end; rela++) { + Elf_Addr addr = (rela->r_offset - va_kernel_link_pa_offset); + Elf_Addr relocated_addr = rela->r_addend; + + if (rela->r_info != R_RISCV_RELATIVE) + continue; + + /* + * Make sure to not relocate vdso symbols like rt_sigreturn + * which are linked from the address 0 in vmlinux since + * vdso symbol addresses are actually used as an offset from + * mm->context.vdso in VDSO_OFFSET macro. + */ + if (relocated_addr >= KERNEL_LINK_ADDR) + relocated_addr += reloc_offset; + + *(Elf_Addr *)addr = relocated_addr; } } +#endif /* CONFIG_RELOCATABLE */ #ifdef CONFIG_MMU -unsigned long va_pa_offset; -EXPORT_SYMBOL(va_pa_offset); -unsigned long pfn_base; -EXPORT_SYMBOL(pfn_base); +struct pt_alloc_ops pt_ops __meminitdata; pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; -pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; -static bool mmu_enabled; - -#define MAX_EARLY_MAPPING_SIZE SZ_128M +static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); +#ifdef CONFIG_XIP_KERNEL +#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops)) +#define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) +#define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) +#define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) +#endif /* CONFIG_XIP_KERNEL */ + +static const pgprot_t protection_map[16] = { + [VM_NONE] = PAGE_NONE, + [VM_READ] = PAGE_READ, + [VM_WRITE] = PAGE_COPY, + [VM_WRITE | VM_READ] = PAGE_COPY, + [VM_EXEC] = PAGE_EXEC, + [VM_EXEC | VM_READ] = PAGE_READ_EXEC, + [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC, + [VM_SHARED] = PAGE_NONE, + [VM_SHARED | VM_READ] = PAGE_READ, + [VM_SHARED | VM_WRITE] = PAGE_SHARED, + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, + [VM_SHARED | VM_EXEC] = PAGE_EXEC, + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC, + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC +}; +DECLARE_VM_GET_PAGE_PROT + void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) { unsigned long addr = __fix_to_virt(idx); @@ -199,159 +401,515 @@ void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) ptep = &fixmap_pte[pte_index(addr)]; - if (pgprot_val(prot)) { + if (pgprot_val(prot)) set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); - } else { + else pte_clear(&init_mm, addr, ptep); - local_flush_tlb_page(addr); - } + local_flush_tlb_page(addr); } -static pte_t *__init get_pte_virt(phys_addr_t pa) +static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) { - if (mmu_enabled) { - clear_fixmap(FIX_PTE); - return (pte_t *)set_fixmap_offset(FIX_PTE, pa); - } else { - return (pte_t *)((uintptr_t)pa); - } + return (pte_t *)((uintptr_t)pa); } -static phys_addr_t __init alloc_pte(uintptr_t va) +static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) +{ + clear_fixmap(FIX_PTE); + return (pte_t *)set_fixmap_offset(FIX_PTE, pa); +} + +static inline pte_t *__meminit get_pte_virt_late(phys_addr_t pa) +{ + return (pte_t *) __va(pa); +} + +static inline phys_addr_t __init alloc_pte_early(uintptr_t va) { /* * We only create PMD or PGD early mappings so we * should never reach here with MMU disabled. */ - BUG_ON(!mmu_enabled); + BUG(); +} +static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) +{ return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); } -static void __init create_pte_mapping(pte_t *ptep, - uintptr_t va, phys_addr_t pa, - phys_addr_t sz, pgprot_t prot) +static phys_addr_t __meminit alloc_pte_late(uintptr_t va) +{ + struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0); + + BUG_ON(!ptdesc || !pagetable_pte_ctor(ptdesc)); + return __pa((pte_t *)ptdesc_address(ptdesc)); +} + +static void __meminit create_pte_mapping(pte_t *ptep, uintptr_t va, phys_addr_t pa, phys_addr_t sz, + pgprot_t prot) { - uintptr_t pte_index = pte_index(va); + uintptr_t pte_idx = pte_index(va); BUG_ON(sz != PAGE_SIZE); - if (pte_none(ptep[pte_index])) - ptep[pte_index] = pfn_pte(PFN_DOWN(pa), prot); + if (pte_none(ptep[pte_idx])) + ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); } #ifndef __PAGETABLE_PMD_FOLDED -pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; -pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; +static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; +static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; +static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); + +#ifdef CONFIG_XIP_KERNEL +#define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) +#define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd)) +#define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd)) +#endif /* CONFIG_XIP_KERNEL */ + +static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss; +static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss; +static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); + +#ifdef CONFIG_XIP_KERNEL +#define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d)) +#define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d)) +#define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d)) +#endif /* CONFIG_XIP_KERNEL */ + +static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss; +static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss; +static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); + +#ifdef CONFIG_XIP_KERNEL +#define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud)) +#define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud)) +#define early_pud ((pud_t *)XIP_FIXUP(early_pud)) +#endif /* CONFIG_XIP_KERNEL */ + +static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) +{ + /* Before MMU is enabled */ + return (pmd_t *)((uintptr_t)pa); +} -#if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE -#define NUM_EARLY_PMDS 1UL -#else -#define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE) -#endif -pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE); +static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) +{ + clear_fixmap(FIX_PMD); + return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); +} -static pmd_t *__init get_pmd_virt(phys_addr_t pa) +static pmd_t *__meminit get_pmd_virt_late(phys_addr_t pa) { - if (mmu_enabled) { - clear_fixmap(FIX_PMD); - return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); - } else { - return (pmd_t *)((uintptr_t)pa); - } + return (pmd_t *) __va(pa); } -static phys_addr_t __init alloc_pmd(uintptr_t va) +static phys_addr_t __init alloc_pmd_early(uintptr_t va) { - uintptr_t pmd_num; + BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT); - if (mmu_enabled) - return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); + return (uintptr_t)early_pmd; +} - pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT; - BUG_ON(pmd_num >= NUM_EARLY_PMDS); - return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD]; +static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) +{ + return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); } -static void __init create_pmd_mapping(pmd_t *pmdp, - uintptr_t va, phys_addr_t pa, - phys_addr_t sz, pgprot_t prot) +static phys_addr_t __meminit alloc_pmd_late(uintptr_t va) +{ + struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0); + + BUG_ON(!ptdesc || !pagetable_pmd_ctor(ptdesc)); + return __pa((pmd_t *)ptdesc_address(ptdesc)); +} + +static void __meminit create_pmd_mapping(pmd_t *pmdp, + uintptr_t va, phys_addr_t pa, + phys_addr_t sz, pgprot_t prot) { pte_t *ptep; phys_addr_t pte_phys; - uintptr_t pmd_index = pmd_index(va); + uintptr_t pmd_idx = pmd_index(va); if (sz == PMD_SIZE) { - if (pmd_none(pmdp[pmd_index])) - pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pa), prot); + if (pmd_none(pmdp[pmd_idx])) + pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); return; } - if (pmd_none(pmdp[pmd_index])) { - pte_phys = alloc_pte(va); - pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); - ptep = get_pte_virt(pte_phys); + if (pmd_none(pmdp[pmd_idx])) { + pte_phys = pt_ops.alloc_pte(va); + pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); + ptep = pt_ops.get_pte_virt(pte_phys); memset(ptep, 0, PAGE_SIZE); } else { - pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_index])); - ptep = get_pte_virt(pte_phys); + pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); + ptep = pt_ops.get_pte_virt(pte_phys); } create_pte_mapping(ptep, va, pa, sz, prot); } -#define pgd_next_t pmd_t -#define alloc_pgd_next(__va) alloc_pmd(__va) -#define get_pgd_next_virt(__pa) get_pmd_virt(__pa) +static pud_t *__init get_pud_virt_early(phys_addr_t pa) +{ + return (pud_t *)((uintptr_t)pa); +} + +static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa) +{ + clear_fixmap(FIX_PUD); + return (pud_t *)set_fixmap_offset(FIX_PUD, pa); +} + +static pud_t *__meminit get_pud_virt_late(phys_addr_t pa) +{ + return (pud_t *)__va(pa); +} + +static phys_addr_t __init alloc_pud_early(uintptr_t va) +{ + /* Only one PUD is available for early mapping */ + BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); + + return (uintptr_t)early_pud; +} + +static phys_addr_t __init alloc_pud_fixmap(uintptr_t va) +{ + return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); +} + +static phys_addr_t __meminit alloc_pud_late(uintptr_t va) +{ + unsigned long vaddr; + + vaddr = __get_free_page(GFP_KERNEL); + BUG_ON(!vaddr); + return __pa(vaddr); +} + +static p4d_t *__init get_p4d_virt_early(phys_addr_t pa) +{ + return (p4d_t *)((uintptr_t)pa); +} + +static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa) +{ + clear_fixmap(FIX_P4D); + return (p4d_t *)set_fixmap_offset(FIX_P4D, pa); +} + +static p4d_t *__meminit get_p4d_virt_late(phys_addr_t pa) +{ + return (p4d_t *)__va(pa); +} + +static phys_addr_t __init alloc_p4d_early(uintptr_t va) +{ + /* Only one P4D is available for early mapping */ + BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); + + return (uintptr_t)early_p4d; +} + +static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va) +{ + return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); +} + +static phys_addr_t __meminit alloc_p4d_late(uintptr_t va) +{ + unsigned long vaddr; + + vaddr = __get_free_page(GFP_KERNEL); + BUG_ON(!vaddr); + return __pa(vaddr); +} + +static void __meminit create_pud_mapping(pud_t *pudp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, + pgprot_t prot) +{ + pmd_t *nextp; + phys_addr_t next_phys; + uintptr_t pud_index = pud_index(va); + + if (sz == PUD_SIZE) { + if (pud_val(pudp[pud_index]) == 0) + pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot); + return; + } + + if (pud_val(pudp[pud_index]) == 0) { + next_phys = pt_ops.alloc_pmd(va); + pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE); + nextp = pt_ops.get_pmd_virt(next_phys); + memset(nextp, 0, PAGE_SIZE); + } else { + next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index])); + nextp = pt_ops.get_pmd_virt(next_phys); + } + + create_pmd_mapping(nextp, va, pa, sz, prot); +} + +static void __meminit create_p4d_mapping(p4d_t *p4dp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, + pgprot_t prot) +{ + pud_t *nextp; + phys_addr_t next_phys; + uintptr_t p4d_index = p4d_index(va); + + if (sz == P4D_SIZE) { + if (p4d_val(p4dp[p4d_index]) == 0) + p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot); + return; + } + + if (p4d_val(p4dp[p4d_index]) == 0) { + next_phys = pt_ops.alloc_pud(va); + p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE); + nextp = pt_ops.get_pud_virt(next_phys); + memset(nextp, 0, PAGE_SIZE); + } else { + next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index])); + nextp = pt_ops.get_pud_virt(next_phys); + } + + create_pud_mapping(nextp, va, pa, sz, prot); +} + +#define pgd_next_t p4d_t +#define alloc_pgd_next(__va) (pgtable_l5_enabled ? \ + pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \ + pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))) +#define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \ + pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \ + pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa))) #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ - create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) -#define fixmap_pgd_next fixmap_pmd + (pgtable_l5_enabled ? \ + create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \ + (pgtable_l4_enabled ? \ + create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \ + create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))) +#define fixmap_pgd_next (pgtable_l5_enabled ? \ + (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \ + (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)) +#define trampoline_pgd_next (pgtable_l5_enabled ? \ + (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \ + (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)) #else #define pgd_next_t pte_t -#define alloc_pgd_next(__va) alloc_pte(__va) -#define get_pgd_next_virt(__pa) get_pte_virt(__pa) +#define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) +#define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ create_pte_mapping(__nextp, __va, __pa, __sz, __prot) -#define fixmap_pgd_next fixmap_pte -#endif - -static void __init create_pgd_mapping(pgd_t *pgdp, - uintptr_t va, phys_addr_t pa, - phys_addr_t sz, pgprot_t prot) +#define fixmap_pgd_next ((uintptr_t)fixmap_pte) +#define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) +#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) +#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) +#endif /* __PAGETABLE_PMD_FOLDED */ + +void __meminit create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, + pgprot_t prot) { pgd_next_t *nextp; phys_addr_t next_phys; - uintptr_t pgd_index = pgd_index(va); + uintptr_t pgd_idx = pgd_index(va); if (sz == PGDIR_SIZE) { - if (pgd_val(pgdp[pgd_index]) == 0) - pgdp[pgd_index] = pfn_pgd(PFN_DOWN(pa), prot); + if (pgd_val(pgdp[pgd_idx]) == 0) + pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); return; } - if (pgd_val(pgdp[pgd_index]) == 0) { + if (pgd_val(pgdp[pgd_idx]) == 0) { next_phys = alloc_pgd_next(va); - pgdp[pgd_index] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); + pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); nextp = get_pgd_next_virt(next_phys); memset(nextp, 0, PAGE_SIZE); } else { - next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_index])); + next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); nextp = get_pgd_next_virt(next_phys); } create_pgd_next_mapping(nextp, va, pa, sz, prot); } -static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) +static uintptr_t __meminit best_map_size(phys_addr_t pa, uintptr_t va, phys_addr_t size) { - /* Upgrade to PMD_SIZE mappings whenever possible */ - if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) + if (debug_pagealloc_enabled()) return PAGE_SIZE; - return PMD_SIZE; + if (pgtable_l5_enabled && + !(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE) + return P4D_SIZE; + + if (pgtable_l4_enabled && + !(pa & (PUD_SIZE - 1)) && !(va & (PUD_SIZE - 1)) && size >= PUD_SIZE) + return PUD_SIZE; + + if (IS_ENABLED(CONFIG_64BIT) && + !(pa & (PMD_SIZE - 1)) && !(va & (PMD_SIZE - 1)) && size >= PMD_SIZE) + return PMD_SIZE; + + return PAGE_SIZE; } +#ifdef CONFIG_XIP_KERNEL +#define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base)) +extern char _xiprom[], _exiprom[], __data_loc; + +/* called from head.S with MMU off */ +asmlinkage void __init __copy_data(void) +{ + void *from = (void *)(&__data_loc); + void *to = (void *)CONFIG_PHYS_RAM_BASE; + size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata)); + + memcpy(to, from, sz); +} +#endif + +#ifdef CONFIG_STRICT_KERNEL_RWX +static __meminit pgprot_t pgprot_from_va(uintptr_t va) +{ + if (is_va_kernel_text(va)) + return PAGE_KERNEL_READ_EXEC; + + /* + * In 64-bit kernel, the kernel mapping is outside the linear mapping so + * we must protect its linear mapping alias from being executed and + * written. + * And rodata section is marked readonly in mark_rodata_ro. + */ + if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) + return PAGE_KERNEL_READ; + + return PAGE_KERNEL; +} + +void mark_rodata_ro(void) +{ + set_kernel_memory(__start_rodata, _data, set_memory_ro); + if (IS_ENABLED(CONFIG_64BIT)) + set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), + set_memory_ro); +} +#else +static __meminit pgprot_t pgprot_from_va(uintptr_t va) +{ + if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) + return PAGE_KERNEL; + + return PAGE_KERNEL_EXEC; +} +#endif /* CONFIG_STRICT_KERNEL_RWX */ + +#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) +u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa); + +static void __init disable_pgtable_l5(void) +{ + pgtable_l5_enabled = false; + kernel_map.page_offset = PAGE_OFFSET_L4; + satp_mode = SATP_MODE_48; +} + +static void __init disable_pgtable_l4(void) +{ + pgtable_l4_enabled = false; + kernel_map.page_offset = PAGE_OFFSET_L3; + satp_mode = SATP_MODE_39; +} + +static int __init print_no4lvl(char *p) +{ + pr_info("Disabled 4-level and 5-level paging"); + return 0; +} +early_param("no4lvl", print_no4lvl); + +static int __init print_no5lvl(char *p) +{ + pr_info("Disabled 5-level paging"); + return 0; +} +early_param("no5lvl", print_no5lvl); + +static void __init set_mmap_rnd_bits_max(void) +{ + mmap_rnd_bits_max = MMAP_VA_BITS - PAGE_SHIFT - 3; +} + +/* + * There is a simple way to determine if 4-level is supported by the + * underlying hardware: establish 1:1 mapping in 4-level page table mode + * then read SATP to see if the configuration was taken into account + * meaning sv48 is supported. + */ +static __init void set_satp_mode(uintptr_t dtb_pa) +{ + u64 identity_satp, hw_satp; + uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; + u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa); + + kernel_map.page_offset = PAGE_OFFSET_L5; + + if (satp_mode_cmdline == SATP_MODE_57) { + disable_pgtable_l5(); + } else if (satp_mode_cmdline == SATP_MODE_48) { + disable_pgtable_l5(); + disable_pgtable_l4(); + return; + } + + create_p4d_mapping(early_p4d, + set_satp_mode_pmd, (uintptr_t)early_pud, + P4D_SIZE, PAGE_TABLE); + create_pud_mapping(early_pud, + set_satp_mode_pmd, (uintptr_t)early_pmd, + PUD_SIZE, PAGE_TABLE); + /* Handle the case where set_satp_mode straddles 2 PMDs */ + create_pmd_mapping(early_pmd, + set_satp_mode_pmd, set_satp_mode_pmd, + PMD_SIZE, PAGE_KERNEL_EXEC); + create_pmd_mapping(early_pmd, + set_satp_mode_pmd + PMD_SIZE, + set_satp_mode_pmd + PMD_SIZE, + PMD_SIZE, PAGE_KERNEL_EXEC); +retry: + create_pgd_mapping(early_pg_dir, + set_satp_mode_pmd, + pgtable_l5_enabled ? + (uintptr_t)early_p4d : (uintptr_t)early_pud, + PGDIR_SIZE, PAGE_TABLE); + + identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode; + + local_flush_tlb_all(); + csr_write(CSR_SATP, identity_satp); + hw_satp = csr_swap(CSR_SATP, 0ULL); + local_flush_tlb_all(); + + if (hw_satp != identity_satp) { + if (pgtable_l5_enabled) { + disable_pgtable_l5(); + memset(early_pg_dir, 0, PAGE_SIZE); + goto retry; + } + disable_pgtable_l4(); + } + + memset(early_pg_dir, 0, PAGE_SIZE); + memset(early_p4d, 0, PAGE_SIZE); + memset(early_pud, 0, PAGE_SIZE); + memset(early_pmd, 0, PAGE_SIZE); +} +#endif + /* * setup_vm() is called from head.S with MMU-off. * @@ -370,117 +928,454 @@ static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." #endif -asmlinkage void __init setup_vm(uintptr_t dtb_pa) +#ifdef CONFIG_XIP_KERNEL +static void __init create_kernel_page_table(pgd_t *pgdir, + __always_unused bool early) +{ + uintptr_t va, start_va, end_va; + + /* Map the flash resident part */ + end_va = kernel_map.virt_addr + kernel_map.xiprom_sz; + for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) + create_pgd_mapping(pgdir, va, + kernel_map.xiprom + (va - kernel_map.virt_addr), + PMD_SIZE, PAGE_KERNEL_EXEC); + + /* Map the data in RAM */ + start_va = kernel_map.virt_addr + (uintptr_t)&_sdata - (uintptr_t)&_start; + end_va = kernel_map.virt_addr + kernel_map.size; + for (va = start_va; va < end_va; va += PMD_SIZE) + create_pgd_mapping(pgdir, va, + kernel_map.phys_addr + (va - start_va), + PMD_SIZE, PAGE_KERNEL); +} +#else +static void __init create_kernel_page_table(pgd_t *pgdir, bool early) { uintptr_t va, end_va; - uintptr_t load_pa = (uintptr_t)(&_start); - uintptr_t load_sz = (uintptr_t)(&_end) - load_pa; - uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE); - va_pa_offset = PAGE_OFFSET - load_pa; - pfn_base = PFN_DOWN(load_pa); + end_va = kernel_map.virt_addr + kernel_map.size; + for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) + create_pgd_mapping(pgdir, va, + kernel_map.phys_addr + (va - kernel_map.virt_addr), + PMD_SIZE, + early ? + PAGE_KERNEL_EXEC : pgprot_from_va(va)); +} +#endif + +/* + * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel, + * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR + * entry. + */ +static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va, + uintptr_t dtb_pa) +{ +#ifndef CONFIG_BUILTIN_DTB + uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1); + + /* Make sure the fdt fixmap address is always aligned on PMD size */ + BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE)); + + /* In 32-bit only, the fdt lies in its own PGD */ + if (!IS_ENABLED(CONFIG_64BIT)) { + create_pgd_mapping(early_pg_dir, fix_fdt_va, + pa, MAX_FDT_SIZE, PAGE_KERNEL); + } else { + create_pmd_mapping(fixmap_pmd, fix_fdt_va, + pa, PMD_SIZE, PAGE_KERNEL); + create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE, + pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); + } + + dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1)); +#else + /* + * For 64-bit kernel, __va can't be used since it would return a linear + * mapping address whereas dtb_early_va will be used before + * setup_vm_final installs the linear mapping. For 32-bit kernel, as the + * kernel is mapped in the linear mapping, that makes no difference. + */ + dtb_early_va = kernel_mapping_pa_to_va(dtb_pa); +#endif + + dtb_early_pa = dtb_pa; +} + +/* + * MMU is not enabled, the page tables are allocated directly using + * early_pmd/pud/p4d and the address returned is the physical one. + */ +static void __init pt_ops_set_early(void) +{ + pt_ops.alloc_pte = alloc_pte_early; + pt_ops.get_pte_virt = get_pte_virt_early; +#ifndef __PAGETABLE_PMD_FOLDED + pt_ops.alloc_pmd = alloc_pmd_early; + pt_ops.get_pmd_virt = get_pmd_virt_early; + pt_ops.alloc_pud = alloc_pud_early; + pt_ops.get_pud_virt = get_pud_virt_early; + pt_ops.alloc_p4d = alloc_p4d_early; + pt_ops.get_p4d_virt = get_p4d_virt_early; +#endif +} + +/* + * MMU is enabled but page table setup is not complete yet. + * fixmap page table alloc functions must be used as a means to temporarily + * map the allocated physical pages since the linear mapping does not exist yet. + * + * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va, + * but it will be used as described above. + */ +static void __init pt_ops_set_fixmap(void) +{ + pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap); + pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap); +#ifndef __PAGETABLE_PMD_FOLDED + pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap); + pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap); + pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap); + pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap); + pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap); + pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap); +#endif +} + +/* + * MMU is enabled and page table setup is complete, so from now, we can use + * generic page allocation functions to setup page table. + */ +static void __init pt_ops_set_late(void) +{ + pt_ops.alloc_pte = alloc_pte_late; + pt_ops.get_pte_virt = get_pte_virt_late; +#ifndef __PAGETABLE_PMD_FOLDED + pt_ops.alloc_pmd = alloc_pmd_late; + pt_ops.get_pmd_virt = get_pmd_virt_late; + pt_ops.alloc_pud = alloc_pud_late; + pt_ops.get_pud_virt = get_pud_virt_late; + pt_ops.alloc_p4d = alloc_p4d_late; + pt_ops.get_p4d_virt = get_p4d_virt_late; +#endif +} + +#ifdef CONFIG_RANDOMIZE_BASE +extern bool __init __pi_set_nokaslr_from_cmdline(uintptr_t dtb_pa); +extern u64 __init __pi_get_kaslr_seed(uintptr_t dtb_pa); +extern u64 __init __pi_get_kaslr_seed_zkr(const uintptr_t dtb_pa); + +static int __init print_nokaslr(char *p) +{ + pr_info("Disabled KASLR"); + return 0; +} +early_param("nokaslr", print_nokaslr); + +unsigned long kaslr_offset(void) +{ + return kernel_map.virt_offset; +} +#endif + +asmlinkage void __init setup_vm(uintptr_t dtb_pa) +{ + pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd; + +#ifdef CONFIG_RANDOMIZE_BASE + if (!__pi_set_nokaslr_from_cmdline(dtb_pa)) { + u64 kaslr_seed = __pi_get_kaslr_seed_zkr(dtb_pa); + u32 kernel_size = (uintptr_t)(&_end) - (uintptr_t)(&_start); + u32 nr_pos; + + if (kaslr_seed == 0) + kaslr_seed = __pi_get_kaslr_seed(dtb_pa); + /* + * Compute the number of positions available: we are limited + * by the early page table that only has one PUD and we must + * be aligned on PMD_SIZE. + */ + nr_pos = (PUD_SIZE - kernel_size) / PMD_SIZE; + + kernel_map.virt_offset = (kaslr_seed % nr_pos) * PMD_SIZE; + } +#endif + + kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset; + +#ifdef CONFIG_XIP_KERNEL + kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; + kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); + + phys_ram_base = CONFIG_PHYS_RAM_BASE; +#ifdef CONFIG_SPARSEMEM_VMEMMAP + vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT; +#endif + kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; + kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_start); + + kernel_map.va_kernel_xip_text_pa_offset = kernel_map.virt_addr - kernel_map.xiprom; + kernel_map.va_kernel_xip_data_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr + + (uintptr_t)&_sdata - (uintptr_t)&_start; +#else + kernel_map.phys_addr = (uintptr_t)(&_start); + kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; + kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; +#endif + +#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) + set_satp_mode(dtb_pa); + set_mmap_rnd_bits_max(); +#endif /* - * Enforce boot alignment requirements of RV32 and - * RV64 by only allowing PMD or PGD mappings. + * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem, + * where we have the system memory layout: this allows us to align + * the physical and virtual mappings and then make use of PUD/P4D/PGD + * for the linear mapping. This is only possible because the kernel + * mapping lies outside the linear mapping. + * In 32-bit however, as the kernel resides in the linear mapping, + * setup_vm_final can not change the mapping established here, + * otherwise the same kernel addresses would get mapped to different + * physical addresses (if the start of dram is different from the + * kernel physical address start). */ - BUG_ON(map_size == PAGE_SIZE); + kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ? + 0UL : PAGE_OFFSET - kernel_map.phys_addr; + + memory_limit = KERN_VIRT_SIZE; /* Sanity check alignment and size */ BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); - BUG_ON((load_pa % map_size) != 0); - BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE); + BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0); + +#ifdef CONFIG_64BIT + /* + * The last 4K bytes of the addressable memory can not be mapped because + * of IS_ERR_VALUE macro. + */ + BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); +#endif + +#ifdef CONFIG_RELOCATABLE + /* + * Early page table uses only one PUD, which makes it possible + * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset + * makes the kernel cross over a PUD_SIZE boundary, raise a bug + * since a part of the kernel would not get mapped. + */ + if (IS_ENABLED(CONFIG_64BIT)) + BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size); + relocate_kernel(); +#endif + + apply_early_boot_alternatives(); + pt_ops_set_early(); /* Setup early PGD for fixmap */ create_pgd_mapping(early_pg_dir, FIXADDR_START, - (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); + fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); #ifndef __PAGETABLE_PMD_FOLDED - /* Setup fixmap PMD */ + /* Setup fixmap P4D and PUD */ + if (pgtable_l5_enabled) + create_p4d_mapping(fixmap_p4d, FIXADDR_START, + (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE); + /* Setup fixmap PUD and PMD */ + if (pgtable_l4_enabled) + create_pud_mapping(fixmap_pud, FIXADDR_START, + (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE); create_pmd_mapping(fixmap_pmd, FIXADDR_START, (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); /* Setup trampoline PGD and PMD */ - create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, - (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); - create_pmd_mapping(trampoline_pmd, PAGE_OFFSET, - load_pa, PMD_SIZE, PAGE_KERNEL_EXEC); + create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, + trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE); + if (pgtable_l5_enabled) + create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr, + (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE); + if (pgtable_l4_enabled) + create_pud_mapping(trampoline_pud, kernel_map.virt_addr, + (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE); +#ifdef CONFIG_XIP_KERNEL + create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, + kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC); +#else + create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, + kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); +#endif #else /* Setup trampoline PGD */ - create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, - load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC); + create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, + kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); #endif /* - * Setup early PGD covering entire kernel which will allows + * Setup early PGD covering entire kernel which will allow * us to reach paging_init(). We map all memory banks later * in setup_vm_final() below. */ - end_va = PAGE_OFFSET + load_sz; - for (va = PAGE_OFFSET; va < end_va; va += map_size) - create_pgd_mapping(early_pg_dir, va, - load_pa + (va - PAGE_OFFSET), - map_size, PAGE_KERNEL_EXEC); - - /* Create fixed mapping for early FDT parsing */ - end_va = __fix_to_virt(FIX_FDT) + FIX_FDT_SIZE; - for (va = __fix_to_virt(FIX_FDT); va < end_va; va += PAGE_SIZE) - create_pte_mapping(fixmap_pte, va, - dtb_pa + (va - __fix_to_virt(FIX_FDT)), - PAGE_SIZE, PAGE_KERNEL); - - /* Save pointer to DTB for early FDT parsing */ - dtb_early_va = (void *)fix_to_virt(FIX_FDT) + (dtb_pa & ~PAGE_MASK); - /* Save physical address for memblock reservation */ - dtb_early_pa = dtb_pa; + create_kernel_page_table(early_pg_dir, true); + + /* Setup early mapping for FDT early scan */ + create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa); + + /* + * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap + * range can not span multiple pmds. + */ + BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) + != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); + +#ifndef __PAGETABLE_PMD_FOLDED + /* + * Early ioremap fixmap is already created as it lies within first 2MB + * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END + * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn + * the user if not. + */ + fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; + fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; + if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { + WARN_ON(1); + pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", + pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); + pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", + fix_to_virt(FIX_BTMAP_BEGIN)); + pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", + fix_to_virt(FIX_BTMAP_END)); + + pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); + pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); + } +#endif + + pt_ops_set_fixmap(); } -static void __init setup_vm_final(void) +static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end, + uintptr_t fixed_map_size, const pgprot_t *pgprot) { + phys_addr_t pa; uintptr_t va, map_size; - phys_addr_t pa, start, end; - struct memblock_region *reg; - /* Set mmu_enabled flag */ - mmu_enabled = true; + for (pa = start; pa < end; pa += map_size) { + va = (uintptr_t)__va(pa); + map_size = fixed_map_size ? fixed_map_size : + best_map_size(pa, va, end - pa); - /* Setup swapper PGD for fixmap */ - create_pgd_mapping(swapper_pg_dir, FIXADDR_START, - __pa(fixmap_pgd_next), - PGDIR_SIZE, PAGE_TABLE); + create_pgd_mapping(swapper_pg_dir, va, pa, map_size, + pgprot ? *pgprot : pgprot_from_va(va)); + } +} + +static void __init create_linear_mapping_page_table(void) +{ + phys_addr_t start, end; + phys_addr_t kfence_pool __maybe_unused; + u64 i; + +#ifdef CONFIG_STRICT_KERNEL_RWX + phys_addr_t ktext_start = __pa_symbol(_start); + phys_addr_t ktext_size = __init_data_begin - _start; + phys_addr_t krodata_start = __pa_symbol(__start_rodata); + phys_addr_t krodata_size = _data - __start_rodata; + + /* Isolate kernel text and rodata so they don't get mapped with a PUD */ + memblock_mark_nomap(ktext_start, ktext_size); + memblock_mark_nomap(krodata_start, krodata_size); +#endif - /* Map all memory banks */ - for_each_memblock(memory, reg) { - start = reg->base; - end = start + reg->size; +#ifdef CONFIG_KFENCE + /* + * kfence pool must be backed by PAGE_SIZE mappings, so allocate it + * before we setup the linear mapping so that we avoid using hugepages + * for this region. + */ + kfence_pool = memblock_phys_alloc(KFENCE_POOL_SIZE, PAGE_SIZE); + BUG_ON(!kfence_pool); + memblock_mark_nomap(kfence_pool, KFENCE_POOL_SIZE); + __kfence_pool = __va(kfence_pool); +#endif + + /* Map all memory banks in the linear mapping */ + for_each_mem_range(i, &start, &end) { if (start >= end) break; - if (memblock_is_nomap(reg)) - continue; if (start <= __pa(PAGE_OFFSET) && __pa(PAGE_OFFSET) < end) start = __pa(PAGE_OFFSET); - map_size = best_map_size(start, end - start); - for (pa = start; pa < end; pa += map_size) { - va = (uintptr_t)__va(pa); - create_pgd_mapping(swapper_pg_dir, va, pa, - map_size, PAGE_KERNEL_EXEC); - } + create_linear_mapping_range(start, end, 0, NULL); } +#ifdef CONFIG_STRICT_KERNEL_RWX + create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL); + create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL); + + memblock_clear_nomap(ktext_start, ktext_size); + memblock_clear_nomap(krodata_start, krodata_size); +#endif + +#ifdef CONFIG_KFENCE + create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL); + + memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE); +#endif +} + +static void __init setup_vm_final(void) +{ + /* Setup swapper PGD for fixmap */ +#if !defined(CONFIG_64BIT) + /* + * In 32-bit, the device tree lies in a pgd entry, so it must be copied + * directly in swapper_pg_dir in addition to the pgd entry that points + * to fixmap_pte. + */ + unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT)); + + set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]); +#endif + create_pgd_mapping(swapper_pg_dir, FIXADDR_START, + __pa_symbol(fixmap_pgd_next), + PGDIR_SIZE, PAGE_TABLE); + + /* Map the linear mapping */ + create_linear_mapping_page_table(); + + /* Map the kernel */ + if (IS_ENABLED(CONFIG_64BIT)) + create_kernel_page_table(swapper_pg_dir, false); + +#ifdef CONFIG_KASAN + kasan_swapper_init(); +#endif + /* Clear fixmap PTE and PMD mappings */ clear_fixmap(FIX_PTE); clear_fixmap(FIX_PMD); + clear_fixmap(FIX_PUD); + clear_fixmap(FIX_P4D); /* Move to swapper page table */ - csr_write(CSR_SATP, PFN_DOWN(__pa(swapper_pg_dir)) | SATP_MODE); + csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode); local_flush_tlb_all(); + + pt_ops_set_late(); } #else asmlinkage void __init setup_vm(uintptr_t dtb_pa) { dtb_early_va = (void *)dtb_pa; + dtb_early_pa = dtb_pa; + +#ifdef CONFIG_RELOCATABLE + kernel_map.virt_addr = (uintptr_t)_start; + kernel_map.phys_addr = (uintptr_t)_start; + relocate_kernel(); +#endif } static inline void setup_vm_final(void) @@ -488,19 +1383,446 @@ static inline void setup_vm_final(void) } #endif /* CONFIG_MMU */ +/* + * reserve_crashkernel() - reserves memory for crash kernel + * + * This function reserves memory area given in "crashkernel=" kernel command + * line parameter. The memory reserved is used by dump capture kernel when + * primary kernel is crashing. + */ +static void __init arch_reserve_crashkernel(void) +{ + unsigned long long low_size = 0; + unsigned long long crash_base, crash_size; + bool high = false; + int ret; + + if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) + return; + + ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), + &crash_size, &crash_base, + &low_size, &high); + if (ret) + return; + + reserve_crashkernel_generic(crash_size, crash_base, low_size, high); +} + void __init paging_init(void) { + setup_bootmem(); setup_vm_final(); - memblocks_present(); + + /* Depend on that Linear Mapping is ready */ + memblock_allow_resize(); +} + +void __init misc_mem_init(void) +{ + early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); + arch_numa_init(); sparse_init(); - setup_zero_page(); +#ifdef CONFIG_SPARSEMEM_VMEMMAP + /* The entire VMEMMAP region has been populated. Flush TLB for this region */ + local_flush_tlb_kernel_range(VMEMMAP_START, VMEMMAP_END); +#endif zone_sizes_init(); + arch_reserve_crashkernel(); + memblock_dump_all(); } #ifdef CONFIG_SPARSEMEM_VMEMMAP +void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node, + unsigned long addr, unsigned long next) +{ + pmd_set_huge(pmd, virt_to_phys(p), PAGE_KERNEL); +} + +int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node, + unsigned long addr, unsigned long next) +{ + vmemmap_verify((pte_t *)pmdp, node, addr, next); + return 1; +} + int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, struct vmem_altmap *altmap) { - return vmemmap_populate_basepages(start, end, node); + /* + * Note that SPARSEMEM_VMEMMAP is only selected for rv64 and that we + * can't use hugepage mappings for 2-level page table because in case of + * memory hotplug, we are not able to update all the page tables with + * the new PMDs. + */ + return vmemmap_populate_hugepages(start, end, node, altmap); +} +#endif + +#if defined(CONFIG_MMU) && defined(CONFIG_64BIT) +/* + * Pre-allocates page-table pages for a specific area in the kernel + * page-table. Only the level which needs to be synchronized between + * all page-tables is allocated because the synchronization can be + * expensive. + */ +static void __init preallocate_pgd_pages_range(unsigned long start, unsigned long end, + const char *area) +{ + unsigned long addr; + const char *lvl; + + for (addr = start; addr < end && addr >= start; addr = ALIGN(addr + 1, PGDIR_SIZE)) { + pgd_t *pgd = pgd_offset_k(addr); + p4d_t *p4d; + pud_t *pud; + pmd_t *pmd; + + lvl = "p4d"; + p4d = p4d_alloc(&init_mm, pgd, addr); + if (!p4d) + goto failed; + + if (pgtable_l5_enabled) + continue; + + lvl = "pud"; + pud = pud_alloc(&init_mm, p4d, addr); + if (!pud) + goto failed; + + if (pgtable_l4_enabled) + continue; + + lvl = "pmd"; + pmd = pmd_alloc(&init_mm, pud, addr); + if (!pmd) + goto failed; + } + return; + +failed: + /* + * The pages have to be there now or they will be missing in + * process page-tables later. + */ + panic("Failed to pre-allocate %s pages for %s area\n", lvl, area); +} + +#define PAGE_END KASAN_SHADOW_START + +void __init pgtable_cache_init(void) +{ + preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc"); + if (IS_ENABLED(CONFIG_MODULES)) + preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules"); + if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) { + preallocate_pgd_pages_range(VMEMMAP_START, VMEMMAP_END, "vmemmap"); + preallocate_pgd_pages_range(PAGE_OFFSET, PAGE_END, "direct map"); + if (IS_ENABLED(CONFIG_KASAN)) + preallocate_pgd_pages_range(KASAN_SHADOW_START, KASAN_SHADOW_END, "kasan"); + } } #endif + +#ifdef CONFIG_EXECMEM +#ifdef CONFIG_MMU +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) +{ + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + [EXECMEM_KPROBES] = { + .start = VMALLOC_START, + .end = VMALLOC_END, + .pgprot = PAGE_KERNEL_READ_EXEC, + .alignment = 1, + }, + [EXECMEM_BPF] = { + .start = BPF_JIT_REGION_START, + .end = BPF_JIT_REGION_END, + .pgprot = PAGE_KERNEL, + .alignment = PAGE_SIZE, + }, + }, + }; + + return &execmem_info; +} +#endif /* CONFIG_MMU */ +#endif /* CONFIG_EXECMEM */ + +#ifdef CONFIG_MEMORY_HOTPLUG +static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) +{ + struct page *page = pmd_page(*pmd); + struct ptdesc *ptdesc = page_ptdesc(page); + pte_t *pte; + int i; + + for (i = 0; i < PTRS_PER_PTE; i++) { + pte = pte_start + i; + if (!pte_none(*pte)) + return; + } + + pagetable_dtor(ptdesc); + if (PageReserved(page)) + free_reserved_page(page); + else + pagetable_free(ptdesc); + pmd_clear(pmd); +} + +static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud, bool is_vmemmap) +{ + struct page *page = pud_page(*pud); + struct ptdesc *ptdesc = page_ptdesc(page); + pmd_t *pmd; + int i; + + for (i = 0; i < PTRS_PER_PMD; i++) { + pmd = pmd_start + i; + if (!pmd_none(*pmd)) + return; + } + + if (!is_vmemmap) + pagetable_dtor(ptdesc); + if (PageReserved(page)) + free_reserved_page(page); + else + pagetable_free(ptdesc); + pud_clear(pud); +} + +static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d) +{ + struct page *page = p4d_page(*p4d); + pud_t *pud; + int i; + + for (i = 0; i < PTRS_PER_PUD; i++) { + pud = pud_start + i; + if (!pud_none(*pud)) + return; + } + + if (PageReserved(page)) + free_reserved_page(page); + else + free_pages((unsigned long)page_address(page), 0); + p4d_clear(p4d); +} + +static void __meminit free_vmemmap_storage(struct page *page, size_t size, + struct vmem_altmap *altmap) +{ + int order = get_order(size); + + if (altmap) { + vmem_altmap_free(altmap, size >> PAGE_SHIFT); + return; + } + + if (PageReserved(page)) { + unsigned int nr_pages = 1 << order; + + while (nr_pages--) + free_reserved_page(page++); + return; + } + + free_pages((unsigned long)page_address(page), order); +} + +static void __meminit remove_pte_mapping(pte_t *pte_base, unsigned long addr, unsigned long end, + bool is_vmemmap, struct vmem_altmap *altmap) +{ + unsigned long next; + pte_t *ptep, pte; + + for (; addr < end; addr = next) { + next = (addr + PAGE_SIZE) & PAGE_MASK; + if (next > end) + next = end; + + ptep = pte_base + pte_index(addr); + pte = ptep_get(ptep); + if (!pte_present(*ptep)) + continue; + + pte_clear(&init_mm, addr, ptep); + if (is_vmemmap) + free_vmemmap_storage(pte_page(pte), PAGE_SIZE, altmap); + } +} + +static void __meminit remove_pmd_mapping(pmd_t *pmd_base, unsigned long addr, unsigned long end, + bool is_vmemmap, struct vmem_altmap *altmap) +{ + unsigned long next; + pte_t *pte_base; + pmd_t *pmdp, pmd; + + for (; addr < end; addr = next) { + next = pmd_addr_end(addr, end); + pmdp = pmd_base + pmd_index(addr); + pmd = pmdp_get(pmdp); + if (!pmd_present(pmd)) + continue; + + if (pmd_leaf(pmd)) { + pmd_clear(pmdp); + if (is_vmemmap) + free_vmemmap_storage(pmd_page(pmd), PMD_SIZE, altmap); + continue; + } + + pte_base = (pte_t *)pmd_page_vaddr(*pmdp); + remove_pte_mapping(pte_base, addr, next, is_vmemmap, altmap); + free_pte_table(pte_base, pmdp); + } +} + +static void __meminit remove_pud_mapping(pud_t *pud_base, unsigned long addr, unsigned long end, + bool is_vmemmap, struct vmem_altmap *altmap) +{ + unsigned long next; + pud_t *pudp, pud; + pmd_t *pmd_base; + + for (; addr < end; addr = next) { + next = pud_addr_end(addr, end); + pudp = pud_base + pud_index(addr); + pud = pudp_get(pudp); + if (!pud_present(pud)) + continue; + + if (pud_leaf(pud)) { + if (pgtable_l4_enabled) { + pud_clear(pudp); + if (is_vmemmap) + free_vmemmap_storage(pud_page(pud), PUD_SIZE, altmap); + } + continue; + } + + pmd_base = pmd_offset(pudp, 0); + remove_pmd_mapping(pmd_base, addr, next, is_vmemmap, altmap); + + if (pgtable_l4_enabled) + free_pmd_table(pmd_base, pudp, is_vmemmap); + } +} + +static void __meminit remove_p4d_mapping(p4d_t *p4d_base, unsigned long addr, unsigned long end, + bool is_vmemmap, struct vmem_altmap *altmap) +{ + unsigned long next; + p4d_t *p4dp, p4d; + pud_t *pud_base; + + for (; addr < end; addr = next) { + next = p4d_addr_end(addr, end); + p4dp = p4d_base + p4d_index(addr); + p4d = p4dp_get(p4dp); + if (!p4d_present(p4d)) + continue; + + if (p4d_leaf(p4d)) { + if (pgtable_l5_enabled) { + p4d_clear(p4dp); + if (is_vmemmap) + free_vmemmap_storage(p4d_page(p4d), P4D_SIZE, altmap); + } + continue; + } + + pud_base = pud_offset(p4dp, 0); + remove_pud_mapping(pud_base, addr, next, is_vmemmap, altmap); + + if (pgtable_l5_enabled) + free_pud_table(pud_base, p4dp); + } +} + +static void __meminit remove_pgd_mapping(unsigned long va, unsigned long end, bool is_vmemmap, + struct vmem_altmap *altmap) +{ + unsigned long addr, next; + p4d_t *p4d_base; + pgd_t *pgd; + + for (addr = va; addr < end; addr = next) { + next = pgd_addr_end(addr, end); + pgd = pgd_offset_k(addr); + + if (!pgd_present(*pgd)) + continue; + + if (pgd_leaf(*pgd)) + continue; + + p4d_base = p4d_offset(pgd, 0); + remove_p4d_mapping(p4d_base, addr, next, is_vmemmap, altmap); + } + + flush_tlb_all(); +} + +static void __meminit remove_linear_mapping(phys_addr_t start, u64 size) +{ + unsigned long va = (unsigned long)__va(start); + unsigned long end = (unsigned long)__va(start + size); + + remove_pgd_mapping(va, end, false, NULL); +} + +struct range arch_get_mappable_range(void) +{ + struct range mhp_range; + + mhp_range.start = __pa(PAGE_OFFSET); + mhp_range.end = __pa(PAGE_END - 1); + return mhp_range; +} + +int __ref arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) +{ + int ret = 0; + + create_linear_mapping_range(start, start + size, 0, ¶ms->pgprot); + ret = __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT, params); + if (ret) { + remove_linear_mapping(start, size); + goto out; + } + + max_pfn = PFN_UP(start + size); + max_low_pfn = max_pfn; + + out: + flush_tlb_all(); + return ret; +} + +void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) +{ + __remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap); + remove_linear_mapping(start, size); + flush_tlb_all(); +} + +void __ref vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap) +{ + remove_pgd_mapping(start, end, true, altmap); +} +#endif /* CONFIG_MEMORY_HOTPLUG */ |