![James Morse](/assets/img/avatar_default.png)
include/linux/mmzone.h describes ARCH_HAS_HOLES_MEMORYMODEL as relevant when parts the memmap have been free()d. This would happen on systems where memory is smaller than a sparsemem-section, and the extra struct pages are expensive. pfn_valid() on these systems returns true for the whole sparsemem-section, so an extra memmap_valid_within() check is needed. On arm64 we have nomap memory, so always provide pfn_valid() to test for nomap pages. This means ARCH_HAS_HOLES_MEMORYMODEL's extra checks are already rolled up into pfn_valid(). Remove it. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
692 lines
18 KiB
C
692 lines
18 KiB
C
/*
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* Based on arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2005 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/errno.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/cache.h>
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/sort.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-contiguous.h>
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#include <linux/efi.h>
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#include <linux/swiotlb.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/crash_dump.h>
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#include <asm/boot.h>
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#include <asm/fixmap.h>
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#include <asm/kasan.h>
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#include <asm/kernel-pgtable.h>
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#include <asm/memory.h>
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#include <asm/numa.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sizes.h>
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#include <asm/tlb.h>
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#include <asm/alternative.h>
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/*
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* We need to be able to catch inadvertent references to memstart_addr
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* that occur (potentially in generic code) before arm64_memblock_init()
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* executes, which assigns it its actual value. So use a default value
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* that cannot be mistaken for a real physical address.
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*/
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s64 memstart_addr __ro_after_init = -1;
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phys_addr_t arm64_dma_phys_limit __ro_after_init;
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#ifdef CONFIG_BLK_DEV_INITRD
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static int __init early_initrd(char *p)
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{
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unsigned long start, size;
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char *endp;
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start = memparse(p, &endp);
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if (*endp == ',') {
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size = memparse(endp + 1, NULL);
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initrd_start = start;
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initrd_end = start + size;
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}
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return 0;
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}
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early_param("initrd", early_initrd);
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#endif
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#ifdef CONFIG_KEXEC_CORE
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/*
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* reserve_crashkernel() - reserves memory for crash kernel
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*
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* This function reserves memory area given in "crashkernel=" kernel command
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* line parameter. The memory reserved is used by dump capture kernel when
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* primary kernel is crashing.
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*/
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static void __init reserve_crashkernel(void)
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{
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unsigned long long crash_base, crash_size;
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int ret;
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ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
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&crash_size, &crash_base);
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/* no crashkernel= or invalid value specified */
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if (ret || !crash_size)
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return;
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crash_size = PAGE_ALIGN(crash_size);
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if (crash_base == 0) {
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/* Current arm64 boot protocol requires 2MB alignment */
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crash_base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT,
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crash_size, SZ_2M);
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if (crash_base == 0) {
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pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
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crash_size);
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return;
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}
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} else {
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/* User specifies base address explicitly. */
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if (!memblock_is_region_memory(crash_base, crash_size)) {
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pr_warn("cannot reserve crashkernel: region is not memory\n");
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return;
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}
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if (memblock_is_region_reserved(crash_base, crash_size)) {
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pr_warn("cannot reserve crashkernel: region overlaps reserved memory\n");
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return;
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}
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if (!IS_ALIGNED(crash_base, SZ_2M)) {
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pr_warn("cannot reserve crashkernel: base address is not 2MB aligned\n");
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return;
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}
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}
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memblock_reserve(crash_base, crash_size);
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pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
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crash_base, crash_base + crash_size, crash_size >> 20);
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crashk_res.start = crash_base;
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crashk_res.end = crash_base + crash_size - 1;
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}
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static void __init kexec_reserve_crashkres_pages(void)
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{
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#ifdef CONFIG_HIBERNATION
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phys_addr_t addr;
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struct page *page;
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if (!crashk_res.end)
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return;
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/*
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* To reduce the size of hibernation image, all the pages are
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* marked as Reserved initially.
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*/
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for (addr = crashk_res.start; addr < (crashk_res.end + 1);
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addr += PAGE_SIZE) {
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page = phys_to_page(addr);
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SetPageReserved(page);
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}
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#endif
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}
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#else
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static void __init reserve_crashkernel(void)
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{
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}
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static void __init kexec_reserve_crashkres_pages(void)
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{
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}
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#endif /* CONFIG_KEXEC_CORE */
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#ifdef CONFIG_CRASH_DUMP
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static int __init early_init_dt_scan_elfcorehdr(unsigned long node,
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const char *uname, int depth, void *data)
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{
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const __be32 *reg;
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int len;
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if (depth != 1 || strcmp(uname, "chosen") != 0)
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return 0;
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reg = of_get_flat_dt_prop(node, "linux,elfcorehdr", &len);
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if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells)))
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return 1;
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elfcorehdr_addr = dt_mem_next_cell(dt_root_addr_cells, ®);
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elfcorehdr_size = dt_mem_next_cell(dt_root_size_cells, ®);
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return 1;
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}
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/*
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* reserve_elfcorehdr() - reserves memory for elf core header
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*
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* This function reserves the memory occupied by an elf core header
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* described in the device tree. This region contains all the
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* information about primary kernel's core image and is used by a dump
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* capture kernel to access the system memory on primary kernel.
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*/
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static void __init reserve_elfcorehdr(void)
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{
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of_scan_flat_dt(early_init_dt_scan_elfcorehdr, NULL);
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if (!elfcorehdr_size)
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return;
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if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
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pr_warn("elfcorehdr is overlapped\n");
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return;
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}
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memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
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pr_info("Reserving %lldKB of memory at 0x%llx for elfcorehdr\n",
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elfcorehdr_size >> 10, elfcorehdr_addr);
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}
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#else
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static void __init reserve_elfcorehdr(void)
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{
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}
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#endif /* CONFIG_CRASH_DUMP */
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/*
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* Return the maximum physical address for ZONE_DMA32 (DMA_BIT_MASK(32)). It
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* currently assumes that for memory starting above 4G, 32-bit devices will
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* use a DMA offset.
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*/
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static phys_addr_t __init max_zone_dma_phys(void)
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{
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phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
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return min(offset + (1ULL << 32), memblock_end_of_DRAM());
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}
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#ifdef CONFIG_NUMA
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static void __init zone_sizes_init(unsigned long min, unsigned long max)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES] = {0};
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if (IS_ENABLED(CONFIG_ZONE_DMA32))
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max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());
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max_zone_pfns[ZONE_NORMAL] = max;
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free_area_init_nodes(max_zone_pfns);
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}
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#else
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static void __init zone_sizes_init(unsigned long min, unsigned long max)
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{
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struct memblock_region *reg;
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unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
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unsigned long max_dma = min;
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memset(zone_size, 0, sizeof(zone_size));
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/* 4GB maximum for 32-bit only capable devices */
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#ifdef CONFIG_ZONE_DMA32
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max_dma = PFN_DOWN(arm64_dma_phys_limit);
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zone_size[ZONE_DMA32] = max_dma - min;
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#endif
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zone_size[ZONE_NORMAL] = max - max_dma;
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memcpy(zhole_size, zone_size, sizeof(zhole_size));
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (start >= max)
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continue;
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#ifdef CONFIG_ZONE_DMA32
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if (start < max_dma) {
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unsigned long dma_end = min(end, max_dma);
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zhole_size[ZONE_DMA32] -= dma_end - start;
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}
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#endif
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if (end > max_dma) {
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unsigned long normal_end = min(end, max);
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unsigned long normal_start = max(start, max_dma);
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zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
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}
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}
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free_area_init_node(0, zone_size, min, zhole_size);
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}
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#endif /* CONFIG_NUMA */
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int pfn_valid(unsigned long pfn)
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{
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phys_addr_t addr = pfn << PAGE_SHIFT;
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if ((addr >> PAGE_SHIFT) != pfn)
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return 0;
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return memblock_is_map_memory(addr);
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}
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EXPORT_SYMBOL(pfn_valid);
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#ifndef CONFIG_SPARSEMEM
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static void __init arm64_memory_present(void)
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{
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}
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#else
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static void __init arm64_memory_present(void)
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{
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struct memblock_region *reg;
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for_each_memblock(memory, reg) {
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int nid = memblock_get_region_node(reg);
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memory_present(nid, memblock_region_memory_base_pfn(reg),
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memblock_region_memory_end_pfn(reg));
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}
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}
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#endif
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static phys_addr_t memory_limit = PHYS_ADDR_MAX;
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/*
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* Limit the memory size that was specified via FDT.
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*/
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static int __init early_mem(char *p)
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{
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if (!p)
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return 1;
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memory_limit = memparse(p, &p) & PAGE_MASK;
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pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
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return 0;
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}
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early_param("mem", early_mem);
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static int __init early_init_dt_scan_usablemem(unsigned long node,
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const char *uname, int depth, void *data)
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{
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struct memblock_region *usablemem = data;
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const __be32 *reg;
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int len;
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if (depth != 1 || strcmp(uname, "chosen") != 0)
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return 0;
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reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);
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if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells)))
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return 1;
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usablemem->base = dt_mem_next_cell(dt_root_addr_cells, ®);
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usablemem->size = dt_mem_next_cell(dt_root_size_cells, ®);
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return 1;
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}
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static void __init fdt_enforce_memory_region(void)
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{
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struct memblock_region reg = {
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.size = 0,
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};
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of_scan_flat_dt(early_init_dt_scan_usablemem, ®);
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if (reg.size)
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memblock_cap_memory_range(reg.base, reg.size);
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}
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void __init arm64_memblock_init(void)
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{
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const s64 linear_region_size = -(s64)PAGE_OFFSET;
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/* Handle linux,usable-memory-range property */
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fdt_enforce_memory_region();
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/* Remove memory above our supported physical address size */
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memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);
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/*
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* Ensure that the linear region takes up exactly half of the kernel
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* virtual address space. This way, we can distinguish a linear address
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* from a kernel/module/vmalloc address by testing a single bit.
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*/
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BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1));
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/*
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* Select a suitable value for the base of physical memory.
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*/
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memstart_addr = round_down(memblock_start_of_DRAM(),
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ARM64_MEMSTART_ALIGN);
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/*
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* Remove the memory that we will not be able to cover with the
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* linear mapping. Take care not to clip the kernel which may be
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* high in memory.
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*/
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memblock_remove(max_t(u64, memstart_addr + linear_region_size,
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__pa_symbol(_end)), ULLONG_MAX);
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if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) {
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/* ensure that memstart_addr remains sufficiently aligned */
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memstart_addr = round_up(memblock_end_of_DRAM() - linear_region_size,
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ARM64_MEMSTART_ALIGN);
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memblock_remove(0, memstart_addr);
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}
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/*
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* Apply the memory limit if it was set. Since the kernel may be loaded
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* high up in memory, add back the kernel region that must be accessible
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* via the linear mapping.
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*/
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if (memory_limit != PHYS_ADDR_MAX) {
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memblock_mem_limit_remove_map(memory_limit);
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memblock_add(__pa_symbol(_text), (u64)(_end - _text));
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}
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if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_start) {
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/*
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* Add back the memory we just removed if it results in the
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* initrd to become inaccessible via the linear mapping.
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* Otherwise, this is a no-op
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*/
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u64 base = initrd_start & PAGE_MASK;
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u64 size = PAGE_ALIGN(initrd_end) - base;
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/*
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* We can only add back the initrd memory if we don't end up
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* with more memory than we can address via the linear mapping.
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* It is up to the bootloader to position the kernel and the
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* initrd reasonably close to each other (i.e., within 32 GB of
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* each other) so that all granule/#levels combinations can
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* always access both.
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*/
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if (WARN(base < memblock_start_of_DRAM() ||
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base + size > memblock_start_of_DRAM() +
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linear_region_size,
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"initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) {
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initrd_start = 0;
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} else {
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memblock_remove(base, size); /* clear MEMBLOCK_ flags */
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memblock_add(base, size);
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memblock_reserve(base, size);
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}
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}
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if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
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extern u16 memstart_offset_seed;
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u64 range = linear_region_size -
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(memblock_end_of_DRAM() - memblock_start_of_DRAM());
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/*
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* If the size of the linear region exceeds, by a sufficient
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* margin, the size of the region that the available physical
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* memory spans, randomize the linear region as well.
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*/
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if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
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range = range / ARM64_MEMSTART_ALIGN + 1;
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memstart_addr -= ARM64_MEMSTART_ALIGN *
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((range * memstart_offset_seed) >> 16);
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}
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}
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/*
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* Register the kernel text, kernel data, initrd, and initial
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* pagetables with memblock.
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*/
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memblock_reserve(__pa_symbol(_text), _end - _text);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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memblock_reserve(initrd_start, initrd_end - initrd_start);
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/* the generic initrd code expects virtual addresses */
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initrd_start = __phys_to_virt(initrd_start);
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initrd_end = __phys_to_virt(initrd_end);
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}
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#endif
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early_init_fdt_scan_reserved_mem();
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/* 4GB maximum for 32-bit only capable devices */
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if (IS_ENABLED(CONFIG_ZONE_DMA32))
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arm64_dma_phys_limit = max_zone_dma_phys();
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else
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arm64_dma_phys_limit = PHYS_MASK + 1;
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reserve_crashkernel();
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reserve_elfcorehdr();
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high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
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dma_contiguous_reserve(arm64_dma_phys_limit);
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memblock_allow_resize();
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}
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void __init bootmem_init(void)
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{
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unsigned long min, max;
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min = PFN_UP(memblock_start_of_DRAM());
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max = PFN_DOWN(memblock_end_of_DRAM());
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early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT);
|
|
|
|
max_pfn = max_low_pfn = max;
|
|
|
|
arm64_numa_init();
|
|
/*
|
|
* Sparsemem tries to allocate bootmem in memory_present(), so must be
|
|
* done after the fixed reservations.
|
|
*/
|
|
arm64_memory_present();
|
|
|
|
sparse_init();
|
|
zone_sizes_init(min, max);
|
|
|
|
memblock_dump_all();
|
|
}
|
|
|
|
#ifndef CONFIG_SPARSEMEM_VMEMMAP
|
|
static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
struct page *start_pg, *end_pg;
|
|
unsigned long pg, pgend;
|
|
|
|
/*
|
|
* Convert start_pfn/end_pfn to a struct page pointer.
|
|
*/
|
|
start_pg = pfn_to_page(start_pfn - 1) + 1;
|
|
end_pg = pfn_to_page(end_pfn - 1) + 1;
|
|
|
|
/*
|
|
* Convert to physical addresses, and round start upwards and end
|
|
* downwards.
|
|
*/
|
|
pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
|
|
pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
|
|
|
|
/*
|
|
* If there are free pages between these, free the section of the
|
|
* memmap array.
|
|
*/
|
|
if (pg < pgend)
|
|
free_bootmem(pg, pgend - pg);
|
|
}
|
|
|
|
/*
|
|
* The mem_map array can get very big. Free the unused area of the memory map.
|
|
*/
|
|
static void __init free_unused_memmap(void)
|
|
{
|
|
unsigned long start, prev_end = 0;
|
|
struct memblock_region *reg;
|
|
|
|
for_each_memblock(memory, reg) {
|
|
start = __phys_to_pfn(reg->base);
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
/*
|
|
* Take care not to free memmap entries that don't exist due
|
|
* to SPARSEMEM sections which aren't present.
|
|
*/
|
|
start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
|
|
#endif
|
|
/*
|
|
* If we had a previous bank, and there is a space between the
|
|
* current bank and the previous, free it.
|
|
*/
|
|
if (prev_end && prev_end < start)
|
|
free_memmap(prev_end, start);
|
|
|
|
/*
|
|
* Align up here since the VM subsystem insists that the
|
|
* memmap entries are valid from the bank end aligned to
|
|
* MAX_ORDER_NR_PAGES.
|
|
*/
|
|
prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
|
|
MAX_ORDER_NR_PAGES);
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
|
|
free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
|
|
#endif
|
|
}
|
|
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
|
|
|
|
/*
|
|
* mem_init() marks the free areas in the mem_map and tells us how much memory
|
|
* is free. This is done after various parts of the system have claimed their
|
|
* memory after the kernel image.
|
|
*/
|
|
void __init mem_init(void)
|
|
{
|
|
if (swiotlb_force == SWIOTLB_FORCE ||
|
|
max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT))
|
|
swiotlb_init(1);
|
|
else
|
|
swiotlb_force = SWIOTLB_NO_FORCE;
|
|
|
|
set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
|
|
|
|
#ifndef CONFIG_SPARSEMEM_VMEMMAP
|
|
free_unused_memmap();
|
|
#endif
|
|
/* this will put all unused low memory onto the freelists */
|
|
free_all_bootmem();
|
|
|
|
kexec_reserve_crashkres_pages();
|
|
|
|
mem_init_print_info(NULL);
|
|
|
|
/*
|
|
* Check boundaries twice: Some fundamental inconsistencies can be
|
|
* detected at build time already.
|
|
*/
|
|
#ifdef CONFIG_COMPAT
|
|
BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
/*
|
|
* Make sure we chose the upper bound of sizeof(struct page)
|
|
* correctly when sizing the VMEMMAP array.
|
|
*/
|
|
BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT));
|
|
#endif
|
|
|
|
if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
|
|
extern int sysctl_overcommit_memory;
|
|
/*
|
|
* On a machine this small we won't get anywhere without
|
|
* overcommit, so turn it on by default.
|
|
*/
|
|
sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
|
|
}
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
free_reserved_area(lm_alias(__init_begin),
|
|
lm_alias(__init_end),
|
|
0, "unused kernel");
|
|
/*
|
|
* Unmap the __init region but leave the VM area in place. This
|
|
* prevents the region from being reused for kernel modules, which
|
|
* is not supported by kallsyms.
|
|
*/
|
|
unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin));
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
|
|
static int keep_initrd __initdata;
|
|
|
|
void __init free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (!keep_initrd) {
|
|
free_reserved_area((void *)start, (void *)end, 0, "initrd");
|
|
memblock_free(__virt_to_phys(start), end - start);
|
|
}
|
|
}
|
|
|
|
static int __init keepinitrd_setup(char *__unused)
|
|
{
|
|
keep_initrd = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("keepinitrd", keepinitrd_setup);
|
|
#endif
|
|
|
|
/*
|
|
* Dump out memory limit information on panic.
|
|
*/
|
|
static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p)
|
|
{
|
|
if (memory_limit != PHYS_ADDR_MAX) {
|
|
pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
|
|
} else {
|
|
pr_emerg("Memory Limit: none\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block mem_limit_notifier = {
|
|
.notifier_call = dump_mem_limit,
|
|
};
|
|
|
|
static int __init register_mem_limit_dumper(void)
|
|
{
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
|
&mem_limit_notifier);
|
|
return 0;
|
|
}
|
|
__initcall(register_mem_limit_dumper);
|