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095507dc13
Systems configured with CONFIG_ZONE_DMA32, CONFIG_ZONE_NORMAL and
!CONFIG_ZONE_DMA will fail to properly setup ARCH_LOW_ADDRESS_LIMIT. The
limit will default to ~0ULL, effectively spanning the whole memory,
which is too high for a configuration that expects low memory to be
capped at 4GB.
Fix ARCH_LOW_ADDRESS_LIMIT by falling back to arm64_dma32_phys_limit
when arm64_dma_phys_limit isn't set. arm64_dma32_phys_limit will honour
CONFIG_ZONE_DMA32, or span the entire memory when not enabled.
Fixes: 1a8e1cef76
("arm64: use both ZONE_DMA and ZONE_DMA32")
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20201218163307.10150-1-nsaenzjulienne@suse.de
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
509 lines
14 KiB
C
509 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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/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-direct.h>
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#include <linux/dma-map-ops.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 <linux/hugetlb.h>
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#include <linux/acpi_iort.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 <linux/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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EXPORT_SYMBOL(memstart_addr);
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/*
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* We create both ZONE_DMA and ZONE_DMA32. ZONE_DMA covers the first 1G of
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* memory as some devices, namely the Raspberry Pi 4, have peripherals with
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* this limited view of the memory. ZONE_DMA32 will cover the rest of the 32
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* bit addressable memory area.
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*/
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phys_addr_t arm64_dma_phys_limit __ro_after_init;
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phys_addr_t arm64_dma32_phys_limit __ro_after_init;
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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, arm64_dma32_phys_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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#else
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static void __init reserve_crashkernel(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 a zone accessible by the given bits
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* limit. If DRAM starts above 32-bit, expand the zone to the maximum
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* available memory, otherwise cap it at 32-bit.
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*/
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static phys_addr_t __init max_zone_phys(unsigned int zone_bits)
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{
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phys_addr_t zone_mask = DMA_BIT_MASK(zone_bits);
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phys_addr_t phys_start = memblock_start_of_DRAM();
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if (phys_start > U32_MAX)
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zone_mask = PHYS_ADDR_MAX;
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else if (phys_start > zone_mask)
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zone_mask = U32_MAX;
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return min(zone_mask, memblock_end_of_DRAM() - 1) + 1;
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}
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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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unsigned int __maybe_unused acpi_zone_dma_bits;
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unsigned int __maybe_unused dt_zone_dma_bits;
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#ifdef CONFIG_ZONE_DMA
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acpi_zone_dma_bits = fls64(acpi_iort_dma_get_max_cpu_address());
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dt_zone_dma_bits = fls64(of_dma_get_max_cpu_address(NULL));
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zone_dma_bits = min3(32U, dt_zone_dma_bits, acpi_zone_dma_bits);
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arm64_dma_phys_limit = max_zone_phys(zone_dma_bits);
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max_zone_pfns[ZONE_DMA] = PFN_DOWN(arm64_dma_phys_limit);
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#endif
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#ifdef CONFIG_ZONE_DMA32
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max_zone_pfns[ZONE_DMA32] = PFN_DOWN(arm64_dma32_phys_limit);
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#endif
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max_zone_pfns[ZONE_NORMAL] = max;
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free_area_init(max_zone_pfns);
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}
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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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#ifdef CONFIG_SPARSEMEM
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if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
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return 0;
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if (!valid_section(__pfn_to_section(pfn)))
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return 0;
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#endif
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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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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 = PAGE_END - _PAGE_OFFSET(vabits_actual);
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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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* 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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if ((memblock_end_of_DRAM() - memstart_addr) > linear_region_size)
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pr_warn("Memory doesn't fit in the linear mapping, VA_BITS too small\n");
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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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* If we are running with a 52-bit kernel VA config on a system that
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* does not support it, we have to place the available physical
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* memory in the 48-bit addressable part of the linear region, i.e.,
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* we have to move it upward. Since memstart_addr represents the
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* physical address of PAGE_OFFSET, we have to *subtract* from it.
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*/
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if (IS_ENABLED(CONFIG_ARM64_VA_BITS_52) && (vabits_actual != 52))
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memstart_addr -= _PAGE_OFFSET(48) - _PAGE_OFFSET(52);
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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) && phys_initrd_size) {
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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 = phys_initrd_start & PAGE_MASK;
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u64 size = PAGE_ALIGN(phys_initrd_start + phys_initrd_size) - 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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phys_initrd_size = 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 mmfr0 = read_cpuid(ID_AA64MMFR0_EL1);
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int parange = cpuid_feature_extract_unsigned_field(
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mmfr0, ID_AA64MMFR0_PARANGE_SHIFT);
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s64 range = linear_region_size -
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BIT(id_aa64mmfr0_parange_to_phys_shift(parange));
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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 physical memory can
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* span, randomize the linear region as well.
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*/
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if (memstart_offset_seed > 0 && range >= (s64)ARM64_MEMSTART_ALIGN) {
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range /= ARM64_MEMSTART_ALIGN;
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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(_stext), _end - _stext);
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if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {
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/* the generic initrd code expects virtual addresses */
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initrd_start = __phys_to_virt(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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}
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early_init_fdt_scan_reserved_mem();
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if (IS_ENABLED(CONFIG_ZONE_DMA32))
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arm64_dma32_phys_limit = max_zone_phys(32);
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else
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arm64_dma32_phys_limit = PHYS_MASK + 1;
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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_dma32_phys_limit);
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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);
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max_pfn = max_low_pfn = max;
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min_low_pfn = min;
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arm64_numa_init();
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/*
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* must be done after arm64_numa_init() which calls numa_init() to
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* initialize node_online_map that gets used in hugetlb_cma_reserve()
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* while allocating required CMA size across online nodes.
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*/
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#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
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arm64_hugetlb_cma_reserve();
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#endif
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dma_pernuma_cma_reserve();
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/*
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* sparse_init() tries to allocate memory from memblock, so must be
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* done after the fixed reservations
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*/
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sparse_init();
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zone_sizes_init(min, max);
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/*
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* request_standard_resources() depends on crashkernel's memory being
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* reserved, so do it here.
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*/
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reserve_crashkernel();
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memblock_dump_all();
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}
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much memory
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* is free. This is done after various parts of the system have claimed their
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* memory after the kernel image.
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*/
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void __init mem_init(void)
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{
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if (swiotlb_force == SWIOTLB_FORCE ||
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max_pfn > PFN_DOWN(arm64_dma_phys_limit ? : arm64_dma32_phys_limit))
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swiotlb_init(1);
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else
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swiotlb_force = SWIOTLB_NO_FORCE;
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set_max_mapnr(max_pfn - PHYS_PFN_OFFSET);
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/* this will put all unused low memory onto the freelists */
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memblock_free_all();
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mem_init_print_info(NULL);
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/*
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* Check boundaries twice: Some fundamental inconsistencies can be
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* detected at build time already.
|
|
*/
|
|
#ifdef CONFIG_COMPAT
|
|
BUILD_BUG_ON(TASK_SIZE_32 > DEFAULT_MAP_WINDOW_64);
|
|
#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),
|
|
POISON_FREE_INITMEM, "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));
|
|
}
|
|
|
|
void dump_mem_limit(void)
|
|
{
|
|
if (memory_limit != PHYS_ADDR_MAX) {
|
|
pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20);
|
|
} else {
|
|
pr_emerg("Memory Limit: none\n");
|
|
}
|
|
}
|