| Message ID | 20210816122622.30279-1-rppt@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | [v5] memblock: make memblock_find_in_range method private | expand |
On 8/16/21 5:26 AM, Mike Rapoport wrote: > From: Mike Rapoport <rppt@linux.ibm.com> > > There are a lot of uses of memblock_find_in_range() along with > memblock_reserve() from the times memblock allocation APIs did not exist. > > memblock_find_in_range() is the very core of memblock allocations, so any > future changes to its internal behaviour would mandate updates of all the > users outside memblock. > > Replace the calls to memblock_find_in_range() with an equivalent calls to > memblock_phys_alloc() and memblock_phys_alloc_range() and make > memblock_find_in_range() private method of memblock. > > This simplifies the callers, ensures that (unlikely) errors in > memblock_reserve() are handled and improves maintainability of > memblock_find_in_range(). > > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> > Acked-by: Kirill A. Shutemov <kirill.shtuemov@linux.intel.com> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> # ACPI > Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > Acked-by: Nick Kossifidis <mick@ics.forth.gr> # riscv > Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> # arm64 This version passes all my x86/x86_64 boot tests. Tested-by: Guenter Roeck <linux@roeck-us.net> Guenter > --- > v5: > * restore the original behaviour on x86 with addition of more elaborate > comment; I will address the issue in memory_map_top_down() in a separate > series. > > v4: https://lore.kernel.org/lkml/20210812065907.20046-1-rppt@kernel.org > * Add patch that prevents the crashes reported by Guenter Roeck on x86/i386 > on QEMU with 256M or 512M of memory and EFI boot enabled. > * Add Acked-by and Reviewed-by, thanks everybidy! > > v3: https://lore.kernel.org/lkml/20210803064218.6611-1-rppt@kernel.org > * simplify check for exact crash kerenl allocation on arm, per Rob > * make crash_max unsigned long long on arm64, per Rob > > v2: https://lore.kernel.org/lkml/20210802063737.22733-1-rppt@kernel.org > * don't change error message in arm::reserve_crashkernel(), per Russell > > v1: https://lore.kernel.org/lkml/20210730104039.7047-1-rppt@kernel.org > > > arch/arm/kernel/setup.c | 20 +++++--------- > arch/arm64/kvm/hyp/reserved_mem.c | 9 +++---- > arch/arm64/mm/init.c | 36 ++++++++----------------- > arch/mips/kernel/setup.c | 14 +++++----- > arch/riscv/mm/init.c | 44 ++++++++++--------------------- > arch/s390/kernel/setup.c | 10 ++++--- > arch/x86/kernel/aperture_64.c | 5 ++-- > arch/x86/mm/init.c | 23 ++++++++++------ > arch/x86/mm/numa.c | 5 ++-- > arch/x86/mm/numa_emulation.c | 5 ++-- > arch/x86/realmode/init.c | 2 +- > drivers/acpi/tables.c | 5 ++-- > drivers/base/arch_numa.c | 5 +--- > drivers/of/of_reserved_mem.c | 12 ++++++--- > include/linux/memblock.h | 2 -- > mm/memblock.c | 2 +- > 16 files changed, 81 insertions(+), 118 deletions(-) > > diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c > index f97eb2371672..284a80c0b6e1 100644 > --- a/arch/arm/kernel/setup.c > +++ b/arch/arm/kernel/setup.c > @@ -1012,31 +1012,25 @@ static void __init reserve_crashkernel(void) > unsigned long long lowmem_max = __pa(high_memory - 1) + 1; > if (crash_max > lowmem_max) > crash_max = lowmem_max; > - crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max, > - crash_size, CRASH_ALIGN); > + > + crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, > + CRASH_ALIGN, crash_max); > if (!crash_base) { > pr_err("crashkernel reservation failed - No suitable area found.\n"); > return; > } > } else { > + unsigned long long crash_max = crash_base + crash_size; > unsigned long long start; > > - start = memblock_find_in_range(crash_base, > - crash_base + crash_size, > - crash_size, SECTION_SIZE); > - if (start != crash_base) { > + start = memblock_phys_alloc_range(crash_size, SECTION_SIZE, > + crash_base, crash_max); > + if (!start) { > pr_err("crashkernel reservation failed - memory is in use.\n"); > return; > } > } > > - ret = memblock_reserve(crash_base, crash_size); > - if (ret < 0) { > - pr_warn("crashkernel reservation failed - memory is in use (0x%lx)\n", > - (unsigned long)crash_base); > - return; > - } > - > pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n", > (unsigned long)(crash_size >> 20), > (unsigned long)(crash_base >> 20), > diff --git a/arch/arm64/kvm/hyp/reserved_mem.c b/arch/arm64/kvm/hyp/reserved_mem.c > index d654921dd09b..578670e3f608 100644 > --- a/arch/arm64/kvm/hyp/reserved_mem.c > +++ b/arch/arm64/kvm/hyp/reserved_mem.c > @@ -92,12 +92,10 @@ void __init kvm_hyp_reserve(void) > * this is unmapped from the host stage-2, and fallback to PAGE_SIZE. > */ > hyp_mem_size = hyp_mem_pages << PAGE_SHIFT; > - hyp_mem_base = memblock_find_in_range(0, memblock_end_of_DRAM(), > - ALIGN(hyp_mem_size, PMD_SIZE), > - PMD_SIZE); > + hyp_mem_base = memblock_phys_alloc(ALIGN(hyp_mem_size, PMD_SIZE), > + PMD_SIZE); > if (!hyp_mem_base) > - hyp_mem_base = memblock_find_in_range(0, memblock_end_of_DRAM(), > - hyp_mem_size, PAGE_SIZE); > + hyp_mem_base = memblock_phys_alloc(hyp_mem_size, PAGE_SIZE); > else > hyp_mem_size = ALIGN(hyp_mem_size, PMD_SIZE); > > @@ -105,7 +103,6 @@ void __init kvm_hyp_reserve(void) > kvm_err("Failed to reserve hyp memory\n"); > return; > } > - memblock_reserve(hyp_mem_base, hyp_mem_size); > > kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20, > hyp_mem_base); > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c > index 8490ed2917ff..0bffd2d1854f 100644 > --- a/arch/arm64/mm/init.c > +++ b/arch/arm64/mm/init.c > @@ -74,6 +74,7 @@ phys_addr_t arm64_dma_phys_limit __ro_after_init; > static void __init reserve_crashkernel(void) > { > unsigned long long crash_base, crash_size; > + unsigned long long crash_max = arm64_dma_phys_limit; > int ret; > > ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), > @@ -84,33 +85,18 @@ static void __init reserve_crashkernel(void) > > crash_size = PAGE_ALIGN(crash_size); > > - if (crash_base == 0) { > - /* Current arm64 boot protocol requires 2MB alignment */ > - crash_base = memblock_find_in_range(0, arm64_dma_phys_limit, > - crash_size, SZ_2M); > - if (crash_base == 0) { > - pr_warn("cannot allocate crashkernel (size:0x%llx)\n", > - crash_size); > - return; > - } > - } else { > - /* User specifies base address explicitly. */ > - if (!memblock_is_region_memory(crash_base, crash_size)) { > - pr_warn("cannot reserve crashkernel: region is not memory\n"); > - return; > - } > + /* User specifies base address explicitly. */ > + if (crash_base) > + crash_max = crash_base + crash_size; > > - if (memblock_is_region_reserved(crash_base, crash_size)) { > - pr_warn("cannot reserve crashkernel: region overlaps reserved memory\n"); > - return; > - } > - > - if (!IS_ALIGNED(crash_base, SZ_2M)) { > - pr_warn("cannot reserve crashkernel: base address is not 2MB aligned\n"); > - return; > - } > + /* Current arm64 boot protocol requires 2MB alignment */ > + crash_base = memblock_phys_alloc_range(crash_size, SZ_2M, > + crash_base, crash_max); > + if (!crash_base) { > + pr_warn("cannot allocate crashkernel (size:0x%llx)\n", > + crash_size); > + return; > } > - memblock_reserve(crash_base, crash_size); > > pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n", > crash_base, crash_base + crash_size, crash_size >> 20); > diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c > index 23a140327a0b..f979adfd4fc2 100644 > --- a/arch/mips/kernel/setup.c > +++ b/arch/mips/kernel/setup.c > @@ -452,8 +452,9 @@ static void __init mips_parse_crashkernel(void) > return; > > if (crash_base <= 0) { > - crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX, > - crash_size, CRASH_ALIGN); > + crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, > + CRASH_ALIGN, > + CRASH_ADDR_MAX); > if (!crash_base) { > pr_warn("crashkernel reservation failed - No suitable area found.\n"); > return; > @@ -461,8 +462,9 @@ static void __init mips_parse_crashkernel(void) > } else { > unsigned long long start; > > - start = memblock_find_in_range(crash_base, crash_base + crash_size, > - crash_size, 1); > + start = memblock_phys_alloc_range(crash_size, 1, > + crash_base, > + crash_base + crash_size); > if (start != crash_base) { > pr_warn("Invalid memory region reserved for crash kernel\n"); > return; > @@ -656,10 +658,6 @@ static void __init arch_mem_init(char **cmdline_p) > mips_reserve_vmcore(); > > mips_parse_crashkernel(); > -#ifdef CONFIG_KEXEC > - if (crashk_res.start != crashk_res.end) > - memblock_reserve(crashk_res.start, resource_size(&crashk_res)); > -#endif > device_tree_init(); > > /* > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c > index a14bf3910eec..88649337c568 100644 > --- a/arch/riscv/mm/init.c > +++ b/arch/riscv/mm/init.c > @@ -812,38 +812,22 @@ static void __init reserve_crashkernel(void) > > crash_size = PAGE_ALIGN(crash_size); > > - if (crash_base == 0) { > - /* > - * Current riscv boot protocol requires 2MB alignment for > - * RV64 and 4MB alignment for RV32 (hugepage size) > - */ > - crash_base = memblock_find_in_range(search_start, search_end, > - crash_size, PMD_SIZE); > - > - if (crash_base == 0) { > - pr_warn("crashkernel: couldn't allocate %lldKB\n", > - crash_size >> 10); > - return; > - } > - } else { > - /* User specifies base address explicitly. */ > - if (!memblock_is_region_memory(crash_base, crash_size)) { > - pr_warn("crashkernel: requested region is not memory\n"); > - return; > - } > - > - if (memblock_is_region_reserved(crash_base, crash_size)) { > - pr_warn("crashkernel: requested region is reserved\n"); > - return; > - } > - > + if (crash_base) { > + search_start = crash_base; > + search_end = crash_base + crash_size; > + } > > - if (!IS_ALIGNED(crash_base, PMD_SIZE)) { > - pr_warn("crashkernel: requested region is misaligned\n"); > - return; > - } > + /* > + * Current riscv boot protocol requires 2MB alignment for > + * RV64 and 4MB alignment for RV32 (hugepage size) > + */ > + crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, > + search_start, search_end); > + if (crash_base == 0) { > + pr_warn("crashkernel: couldn't allocate %lldKB\n", > + crash_size >> 10); > + return; > } > - memblock_reserve(crash_base, crash_size); > > pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", > crash_base, crash_base + crash_size, crash_size >> 20); > diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c > index ff0f9e838916..3d9efee0f43c 100644 > --- a/arch/s390/kernel/setup.c > +++ b/arch/s390/kernel/setup.c > @@ -626,8 +626,9 @@ static void __init reserve_crashkernel(void) > return; > } > low = crash_base ?: low; > - crash_base = memblock_find_in_range(low, high, crash_size, > - KEXEC_CRASH_MEM_ALIGN); > + crash_base = memblock_phys_alloc_range(crash_size, > + KEXEC_CRASH_MEM_ALIGN, > + low, high); > } > > if (!crash_base) { > @@ -636,14 +637,15 @@ static void __init reserve_crashkernel(void) > return; > } > > - if (register_memory_notifier(&kdump_mem_nb)) > + if (register_memory_notifier(&kdump_mem_nb)) { > + memblock_free(crash_base, crash_size); > return; > + } > > if (!OLDMEM_BASE && MACHINE_IS_VM) > diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); > crashk_res.start = crash_base; > crashk_res.end = crash_base + crash_size - 1; > - memblock_remove(crash_base, crash_size); > pr_info("Reserving %lluMB of memory at %lluMB " > "for crashkernel (System RAM: %luMB)\n", > crash_size >> 20, crash_base >> 20, > diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c > index 294ed4392a0e..10562885f5fc 100644 > --- a/arch/x86/kernel/aperture_64.c > +++ b/arch/x86/kernel/aperture_64.c > @@ -109,14 +109,13 @@ static u32 __init allocate_aperture(void) > * memory. Unfortunately we cannot move it up because that would > * make the IOMMU useless. > */ > - addr = memblock_find_in_range(GART_MIN_ADDR, GART_MAX_ADDR, > - aper_size, aper_size); > + addr = memblock_phys_alloc_range(aper_size, aper_size, > + GART_MIN_ADDR, GART_MAX_ADDR); > if (!addr) { > pr_err("Cannot allocate aperture memory hole [mem %#010lx-%#010lx] (%uKB)\n", > addr, addr + aper_size - 1, aper_size >> 10); > return 0; > } > - memblock_reserve(addr, aper_size); > pr_info("Mapping aperture over RAM [mem %#010lx-%#010lx] (%uKB)\n", > addr, addr + aper_size - 1, aper_size >> 10); > register_nosave_region(addr >> PAGE_SHIFT, > diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c > index 75ef19aa8903..23a14d82e783 100644 > --- a/arch/x86/mm/init.c > +++ b/arch/x86/mm/init.c > @@ -127,14 +127,12 @@ __ref void *alloc_low_pages(unsigned int num) > unsigned long ret = 0; > > if (min_pfn_mapped < max_pfn_mapped) { > - ret = memblock_find_in_range( > + ret = memblock_phys_alloc_range( > + PAGE_SIZE * num, PAGE_SIZE, > min_pfn_mapped << PAGE_SHIFT, > - max_pfn_mapped << PAGE_SHIFT, > - PAGE_SIZE * num , PAGE_SIZE); > + max_pfn_mapped << PAGE_SHIFT); > } > - if (ret) > - memblock_reserve(ret, PAGE_SIZE * num); > - else if (can_use_brk_pgt) > + if (!ret && can_use_brk_pgt) > ret = __pa(extend_brk(PAGE_SIZE * num, PAGE_SIZE)); > > if (!ret) > @@ -610,8 +608,17 @@ static void __init memory_map_top_down(unsigned long map_start, > unsigned long addr; > unsigned long mapped_ram_size = 0; > > - /* xen has big range in reserved near end of ram, skip it at first.*/ > - addr = memblock_find_in_range(map_start, map_end, PMD_SIZE, PMD_SIZE); > + /* > + * Systems that have many reserved areas near top of the memory, > + * e.g. QEMU with less than 1G RAM and EFI enabled, or Xen, will > + * require lots of 4K mappings which may exhaust pgt_buf. > + * Start with top-most PMD_SIZE range aligned at PMD_SIZE to ensure > + * there is enough mapped memory that can be allocated from > + * memblock. > + */ > + addr = memblock_phys_alloc_range(PMD_SIZE, PMD_SIZE, map_start, > + map_end); > + memblock_free(addr, PMD_SIZE); > real_end = addr + PMD_SIZE; > > /* step_size need to be small so pgt_buf from BRK could cover it */ > diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c > index e94da744386f..a1b5c71099e6 100644 > --- a/arch/x86/mm/numa.c > +++ b/arch/x86/mm/numa.c > @@ -376,15 +376,14 @@ static int __init numa_alloc_distance(void) > cnt++; > size = cnt * cnt * sizeof(numa_distance[0]); > > - phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), > - size, PAGE_SIZE); > + phys = memblock_phys_alloc_range(size, PAGE_SIZE, 0, > + PFN_PHYS(max_pfn_mapped)); > if (!phys) { > pr_warn("Warning: can't allocate distance table!\n"); > /* don't retry until explicitly reset */ > numa_distance = (void *)1LU; > return -ENOMEM; > } > - memblock_reserve(phys, size); > > numa_distance = __va(phys); > numa_distance_cnt = cnt; > diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c > index 87d77cc52f86..737491b13728 100644 > --- a/arch/x86/mm/numa_emulation.c > +++ b/arch/x86/mm/numa_emulation.c > @@ -447,13 +447,12 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) > if (numa_dist_cnt) { > u64 phys; > > - phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), > - phys_size, PAGE_SIZE); > + phys = memblock_phys_alloc_range(phys_size, PAGE_SIZE, 0, > + PFN_PHYS(max_pfn_mapped)); > if (!phys) { > pr_warn("NUMA: Warning: can't allocate copy of distance table, disabling emulation\n"); > goto no_emu; > } > - memblock_reserve(phys, phys_size); > phys_dist = __va(phys); > > for (i = 0; i < numa_dist_cnt; i++) > diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c > index 6534c92d0f83..31b5856010cb 100644 > --- a/arch/x86/realmode/init.c > +++ b/arch/x86/realmode/init.c > @@ -28,7 +28,7 @@ void __init reserve_real_mode(void) > WARN_ON(slab_is_available()); > > /* Has to be under 1M so we can execute real-mode AP code. */ > - mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE); > + mem = memblock_phys_alloc_range(size, PAGE_SIZE, 0, 1<<20); > if (!mem) > pr_info("No sub-1M memory is available for the trampoline\n"); > else > diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c > index a37a1532a575..f9383736fa0f 100644 > --- a/drivers/acpi/tables.c > +++ b/drivers/acpi/tables.c > @@ -583,8 +583,8 @@ void __init acpi_table_upgrade(void) > } > > acpi_tables_addr = > - memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, > - all_tables_size, PAGE_SIZE); > + memblock_phys_alloc_range(all_tables_size, PAGE_SIZE, > + 0, ACPI_TABLE_UPGRADE_MAX_PHYS); > if (!acpi_tables_addr) { > WARN_ON(1); > return; > @@ -599,7 +599,6 @@ void __init acpi_table_upgrade(void) > * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) > * works fine. > */ > - memblock_reserve(acpi_tables_addr, all_tables_size); > arch_reserve_mem_area(acpi_tables_addr, all_tables_size); > > /* > diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c > index 4cc4e117727d..46c503486e96 100644 > --- a/drivers/base/arch_numa.c > +++ b/drivers/base/arch_numa.c > @@ -279,13 +279,10 @@ static int __init numa_alloc_distance(void) > int i, j; > > size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]); > - phys = memblock_find_in_range(0, PFN_PHYS(max_pfn), > - size, PAGE_SIZE); > + phys = memblock_phys_alloc_range(size, PAGE_SIZE, 0, PFN_PHYS(max_pfn)); > if (WARN_ON(!phys)) > return -ENOMEM; > > - memblock_reserve(phys, size); > - > numa_distance = __va(phys); > numa_distance_cnt = nr_node_ids; > > diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c > index fd3964d24224..59c1390cdf42 100644 > --- a/drivers/of/of_reserved_mem.c > +++ b/drivers/of/of_reserved_mem.c > @@ -33,18 +33,22 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, > phys_addr_t *res_base) > { > phys_addr_t base; > + int err = 0; > > end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end; > align = !align ? SMP_CACHE_BYTES : align; > - base = memblock_find_in_range(start, end, size, align); > + base = memblock_phys_alloc_range(size, align, start, end); > if (!base) > return -ENOMEM; > > *res_base = base; > - if (nomap) > - return memblock_mark_nomap(base, size); > + if (nomap) { > + err = memblock_mark_nomap(base, size); > + if (err) > + memblock_free(base, size); > + } > > - return memblock_reserve(base, size); > + return err; > } > > /* > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index 4a53c3ca86bd..b066024c62e3 100644 > --- a/include/linux/memblock.h > +++ b/include/linux/memblock.h > @@ -99,8 +99,6 @@ void memblock_discard(void); > static inline void memblock_discard(void) {} > #endif > > -phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, > - phys_addr_t size, phys_addr_t align); > void memblock_allow_resize(void); > int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); > int memblock_add(phys_addr_t base, phys_addr_t size); > diff --git a/mm/memblock.c b/mm/memblock.c > index de7b553baa50..28a813d9e955 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -315,7 +315,7 @@ static phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size, > * Return: > * Found address on success, 0 on failure. > */ > -phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, > +static phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, > phys_addr_t end, phys_addr_t size, > phys_addr_t align) > { > > base-commit: ff1176468d368232b684f75e82563369208bc371 >
On Mon, 16 Aug 2021 15:26:22 +0300, Mike Rapoport wrote: > From: Mike Rapoport <rppt@linux.ibm.com> > > There are a lot of uses of memblock_find_in_range() along with > memblock_reserve() from the times memblock allocation APIs did not exist. > > memblock_find_in_range() is the very core of memblock allocations, so any > future changes to its internal behaviour would mandate updates of all the > users outside memblock. > > Replace the calls to memblock_find_in_range() with an equivalent calls to > memblock_phys_alloc() and memblock_phys_alloc_range() and make > memblock_find_in_range() private method of memblock. > > This simplifies the callers, ensures that (unlikely) errors in > memblock_reserve() are handled and improves maintainability of > memblock_find_in_range(). > > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> > Acked-by: Kirill A. Shutemov <kirill.shtuemov@linux.intel.com> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> # ACPI > Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > Acked-by: Nick Kossifidis <mick@ics.forth.gr> # riscv > Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> # arm64 > --- > v5: > * restore the original behaviour on x86 with addition of more elaborate > comment; I will address the issue in memory_map_top_down() in a separate > series. > > v4: https://lore.kernel.org/lkml/20210812065907.20046-1-rppt@kernel.org > * Add patch that prevents the crashes reported by Guenter Roeck on x86/i386 > on QEMU with 256M or 512M of memory and EFI boot enabled. > * Add Acked-by and Reviewed-by, thanks everybidy! > > v3: https://lore.kernel.org/lkml/20210803064218.6611-1-rppt@kernel.org > * simplify check for exact crash kerenl allocation on arm, per Rob > * make crash_max unsigned long long on arm64, per Rob > > v2: https://lore.kernel.org/lkml/20210802063737.22733-1-rppt@kernel.org > * don't change error message in arm::reserve_crashkernel(), per Russell > > v1: https://lore.kernel.org/lkml/20210730104039.7047-1-rppt@kernel.org > > > arch/arm/kernel/setup.c | 20 +++++--------- > arch/arm64/kvm/hyp/reserved_mem.c | 9 +++---- > arch/arm64/mm/init.c | 36 ++++++++----------------- > arch/mips/kernel/setup.c | 14 +++++----- > arch/riscv/mm/init.c | 44 ++++++++++--------------------- > arch/s390/kernel/setup.c | 10 ++++--- > arch/x86/kernel/aperture_64.c | 5 ++-- > arch/x86/mm/init.c | 23 ++++++++++------ > arch/x86/mm/numa.c | 5 ++-- > arch/x86/mm/numa_emulation.c | 5 ++-- > arch/x86/realmode/init.c | 2 +- > drivers/acpi/tables.c | 5 ++-- > drivers/base/arch_numa.c | 5 +--- > drivers/of/of_reserved_mem.c | 12 ++++++--- > include/linux/memblock.h | 2 -- > mm/memblock.c | 2 +- > 16 files changed, 81 insertions(+), 118 deletions(-) > Acked-by: Rob Herring <robh@kernel.org>
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index f97eb2371672..284a80c0b6e1 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -1012,31 +1012,25 @@ static void __init reserve_crashkernel(void) unsigned long long lowmem_max = __pa(high_memory - 1) + 1; if (crash_max > lowmem_max) crash_max = lowmem_max; - crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max, - crash_size, CRASH_ALIGN); + + crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, + CRASH_ALIGN, crash_max); if (!crash_base) { pr_err("crashkernel reservation failed - No suitable area found.\n"); return; } } else { + unsigned long long crash_max = crash_base + crash_size; unsigned long long start; - start = memblock_find_in_range(crash_base, - crash_base + crash_size, - crash_size, SECTION_SIZE); - if (start != crash_base) { + start = memblock_phys_alloc_range(crash_size, SECTION_SIZE, + crash_base, crash_max); + if (!start) { pr_err("crashkernel reservation failed - memory is in use.\n"); return; } } - ret = memblock_reserve(crash_base, crash_size); - if (ret < 0) { - pr_warn("crashkernel reservation failed - memory is in use (0x%lx)\n", - (unsigned long)crash_base); - return; - } - pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n", (unsigned long)(crash_size >> 20), (unsigned long)(crash_base >> 20), diff --git a/arch/arm64/kvm/hyp/reserved_mem.c b/arch/arm64/kvm/hyp/reserved_mem.c index d654921dd09b..578670e3f608 100644 --- a/arch/arm64/kvm/hyp/reserved_mem.c +++ b/arch/arm64/kvm/hyp/reserved_mem.c @@ -92,12 +92,10 @@ void __init kvm_hyp_reserve(void) * this is unmapped from the host stage-2, and fallback to PAGE_SIZE. */ hyp_mem_size = hyp_mem_pages << PAGE_SHIFT; - hyp_mem_base = memblock_find_in_range(0, memblock_end_of_DRAM(), - ALIGN(hyp_mem_size, PMD_SIZE), - PMD_SIZE); + hyp_mem_base = memblock_phys_alloc(ALIGN(hyp_mem_size, PMD_SIZE), + PMD_SIZE); if (!hyp_mem_base) - hyp_mem_base = memblock_find_in_range(0, memblock_end_of_DRAM(), - hyp_mem_size, PAGE_SIZE); + hyp_mem_base = memblock_phys_alloc(hyp_mem_size, PAGE_SIZE); else hyp_mem_size = ALIGN(hyp_mem_size, PMD_SIZE); @@ -105,7 +103,6 @@ void __init kvm_hyp_reserve(void) kvm_err("Failed to reserve hyp memory\n"); return; } - memblock_reserve(hyp_mem_base, hyp_mem_size); kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20, hyp_mem_base); diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 8490ed2917ff..0bffd2d1854f 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -74,6 +74,7 @@ phys_addr_t arm64_dma_phys_limit __ro_after_init; static void __init reserve_crashkernel(void) { unsigned long long crash_base, crash_size; + unsigned long long crash_max = arm64_dma_phys_limit; int ret; ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), @@ -84,33 +85,18 @@ static void __init reserve_crashkernel(void) crash_size = PAGE_ALIGN(crash_size); - if (crash_base == 0) { - /* Current arm64 boot protocol requires 2MB alignment */ - crash_base = memblock_find_in_range(0, arm64_dma_phys_limit, - crash_size, SZ_2M); - if (crash_base == 0) { - pr_warn("cannot allocate crashkernel (size:0x%llx)\n", - crash_size); - return; - } - } else { - /* User specifies base address explicitly. */ - if (!memblock_is_region_memory(crash_base, crash_size)) { - pr_warn("cannot reserve crashkernel: region is not memory\n"); - return; - } + /* User specifies base address explicitly. */ + if (crash_base) + crash_max = crash_base + crash_size; - if (memblock_is_region_reserved(crash_base, crash_size)) { - pr_warn("cannot reserve crashkernel: region overlaps reserved memory\n"); - return; - } - - if (!IS_ALIGNED(crash_base, SZ_2M)) { - pr_warn("cannot reserve crashkernel: base address is not 2MB aligned\n"); - return; - } + /* Current arm64 boot protocol requires 2MB alignment */ + crash_base = memblock_phys_alloc_range(crash_size, SZ_2M, + crash_base, crash_max); + if (!crash_base) { + pr_warn("cannot allocate crashkernel (size:0x%llx)\n", + crash_size); + return; } - memblock_reserve(crash_base, crash_size); pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n", crash_base, crash_base + crash_size, crash_size >> 20); diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index 23a140327a0b..f979adfd4fc2 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -452,8 +452,9 @@ static void __init mips_parse_crashkernel(void) return; if (crash_base <= 0) { - crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX, - crash_size, CRASH_ALIGN); + crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, + CRASH_ALIGN, + CRASH_ADDR_MAX); if (!crash_base) { pr_warn("crashkernel reservation failed - No suitable area found.\n"); return; @@ -461,8 +462,9 @@ static void __init mips_parse_crashkernel(void) } else { unsigned long long start; - start = memblock_find_in_range(crash_base, crash_base + crash_size, - crash_size, 1); + start = memblock_phys_alloc_range(crash_size, 1, + crash_base, + crash_base + crash_size); if (start != crash_base) { pr_warn("Invalid memory region reserved for crash kernel\n"); return; @@ -656,10 +658,6 @@ static void __init arch_mem_init(char **cmdline_p) mips_reserve_vmcore(); mips_parse_crashkernel(); -#ifdef CONFIG_KEXEC - if (crashk_res.start != crashk_res.end) - memblock_reserve(crashk_res.start, resource_size(&crashk_res)); -#endif device_tree_init(); /* diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index a14bf3910eec..88649337c568 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -812,38 +812,22 @@ static void __init reserve_crashkernel(void) crash_size = PAGE_ALIGN(crash_size); - if (crash_base == 0) { - /* - * Current riscv boot protocol requires 2MB alignment for - * RV64 and 4MB alignment for RV32 (hugepage size) - */ - crash_base = memblock_find_in_range(search_start, search_end, - crash_size, PMD_SIZE); - - if (crash_base == 0) { - pr_warn("crashkernel: couldn't allocate %lldKB\n", - crash_size >> 10); - return; - } - } else { - /* User specifies base address explicitly. */ - if (!memblock_is_region_memory(crash_base, crash_size)) { - pr_warn("crashkernel: requested region is not memory\n"); - return; - } - - if (memblock_is_region_reserved(crash_base, crash_size)) { - pr_warn("crashkernel: requested region is reserved\n"); - return; - } - + if (crash_base) { + search_start = crash_base; + search_end = crash_base + crash_size; + } - if (!IS_ALIGNED(crash_base, PMD_SIZE)) { - pr_warn("crashkernel: requested region is misaligned\n"); - return; - } + /* + * Current riscv boot protocol requires 2MB alignment for + * RV64 and 4MB alignment for RV32 (hugepage size) + */ + crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, + search_start, search_end); + if (crash_base == 0) { + pr_warn("crashkernel: couldn't allocate %lldKB\n", + crash_size >> 10); + return; } - memblock_reserve(crash_base, crash_size); pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", crash_base, crash_base + crash_size, crash_size >> 20); diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index ff0f9e838916..3d9efee0f43c 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -626,8 +626,9 @@ static void __init reserve_crashkernel(void) return; } low = crash_base ?: low; - crash_base = memblock_find_in_range(low, high, crash_size, - KEXEC_CRASH_MEM_ALIGN); + crash_base = memblock_phys_alloc_range(crash_size, + KEXEC_CRASH_MEM_ALIGN, + low, high); } if (!crash_base) { @@ -636,14 +637,15 @@ static void __init reserve_crashkernel(void) return; } - if (register_memory_notifier(&kdump_mem_nb)) + if (register_memory_notifier(&kdump_mem_nb)) { + memblock_free(crash_base, crash_size); return; + } if (!OLDMEM_BASE && MACHINE_IS_VM) diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); crashk_res.start = crash_base; crashk_res.end = crash_base + crash_size - 1; - memblock_remove(crash_base, crash_size); pr_info("Reserving %lluMB of memory at %lluMB " "for crashkernel (System RAM: %luMB)\n", crash_size >> 20, crash_base >> 20, diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c index 294ed4392a0e..10562885f5fc 100644 --- a/arch/x86/kernel/aperture_64.c +++ b/arch/x86/kernel/aperture_64.c @@ -109,14 +109,13 @@ static u32 __init allocate_aperture(void) * memory. Unfortunately we cannot move it up because that would * make the IOMMU useless. */ - addr = memblock_find_in_range(GART_MIN_ADDR, GART_MAX_ADDR, - aper_size, aper_size); + addr = memblock_phys_alloc_range(aper_size, aper_size, + GART_MIN_ADDR, GART_MAX_ADDR); if (!addr) { pr_err("Cannot allocate aperture memory hole [mem %#010lx-%#010lx] (%uKB)\n", addr, addr + aper_size - 1, aper_size >> 10); return 0; } - memblock_reserve(addr, aper_size); pr_info("Mapping aperture over RAM [mem %#010lx-%#010lx] (%uKB)\n", addr, addr + aper_size - 1, aper_size >> 10); register_nosave_region(addr >> PAGE_SHIFT, diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 75ef19aa8903..23a14d82e783 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -127,14 +127,12 @@ __ref void *alloc_low_pages(unsigned int num) unsigned long ret = 0; if (min_pfn_mapped < max_pfn_mapped) { - ret = memblock_find_in_range( + ret = memblock_phys_alloc_range( + PAGE_SIZE * num, PAGE_SIZE, min_pfn_mapped << PAGE_SHIFT, - max_pfn_mapped << PAGE_SHIFT, - PAGE_SIZE * num , PAGE_SIZE); + max_pfn_mapped << PAGE_SHIFT); } - if (ret) - memblock_reserve(ret, PAGE_SIZE * num); - else if (can_use_brk_pgt) + if (!ret && can_use_brk_pgt) ret = __pa(extend_brk(PAGE_SIZE * num, PAGE_SIZE)); if (!ret) @@ -610,8 +608,17 @@ static void __init memory_map_top_down(unsigned long map_start, unsigned long addr; unsigned long mapped_ram_size = 0; - /* xen has big range in reserved near end of ram, skip it at first.*/ - addr = memblock_find_in_range(map_start, map_end, PMD_SIZE, PMD_SIZE); + /* + * Systems that have many reserved areas near top of the memory, + * e.g. QEMU with less than 1G RAM and EFI enabled, or Xen, will + * require lots of 4K mappings which may exhaust pgt_buf. + * Start with top-most PMD_SIZE range aligned at PMD_SIZE to ensure + * there is enough mapped memory that can be allocated from + * memblock. + */ + addr = memblock_phys_alloc_range(PMD_SIZE, PMD_SIZE, map_start, + map_end); + memblock_free(addr, PMD_SIZE); real_end = addr + PMD_SIZE; /* step_size need to be small so pgt_buf from BRK could cover it */ diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index e94da744386f..a1b5c71099e6 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -376,15 +376,14 @@ static int __init numa_alloc_distance(void) cnt++; size = cnt * cnt * sizeof(numa_distance[0]); - phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), - size, PAGE_SIZE); + phys = memblock_phys_alloc_range(size, PAGE_SIZE, 0, + PFN_PHYS(max_pfn_mapped)); if (!phys) { pr_warn("Warning: can't allocate distance table!\n"); /* don't retry until explicitly reset */ numa_distance = (void *)1LU; return -ENOMEM; } - memblock_reserve(phys, size); numa_distance = __va(phys); numa_distance_cnt = cnt; diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c index 87d77cc52f86..737491b13728 100644 --- a/arch/x86/mm/numa_emulation.c +++ b/arch/x86/mm/numa_emulation.c @@ -447,13 +447,12 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) if (numa_dist_cnt) { u64 phys; - phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped), - phys_size, PAGE_SIZE); + phys = memblock_phys_alloc_range(phys_size, PAGE_SIZE, 0, + PFN_PHYS(max_pfn_mapped)); if (!phys) { pr_warn("NUMA: Warning: can't allocate copy of distance table, disabling emulation\n"); goto no_emu; } - memblock_reserve(phys, phys_size); phys_dist = __va(phys); for (i = 0; i < numa_dist_cnt; i++) diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index 6534c92d0f83..31b5856010cb 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -28,7 +28,7 @@ void __init reserve_real_mode(void) WARN_ON(slab_is_available()); /* Has to be under 1M so we can execute real-mode AP code. */ - mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE); + mem = memblock_phys_alloc_range(size, PAGE_SIZE, 0, 1<<20); if (!mem) pr_info("No sub-1M memory is available for the trampoline\n"); else diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index a37a1532a575..f9383736fa0f 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -583,8 +583,8 @@ void __init acpi_table_upgrade(void) } acpi_tables_addr = - memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS, - all_tables_size, PAGE_SIZE); + memblock_phys_alloc_range(all_tables_size, PAGE_SIZE, + 0, ACPI_TABLE_UPGRADE_MAX_PHYS); if (!acpi_tables_addr) { WARN_ON(1); return; @@ -599,7 +599,6 @@ void __init acpi_table_upgrade(void) * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) * works fine. */ - memblock_reserve(acpi_tables_addr, all_tables_size); arch_reserve_mem_area(acpi_tables_addr, all_tables_size); /* diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c index 4cc4e117727d..46c503486e96 100644 --- a/drivers/base/arch_numa.c +++ b/drivers/base/arch_numa.c @@ -279,13 +279,10 @@ static int __init numa_alloc_distance(void) int i, j; size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]); - phys = memblock_find_in_range(0, PFN_PHYS(max_pfn), - size, PAGE_SIZE); + phys = memblock_phys_alloc_range(size, PAGE_SIZE, 0, PFN_PHYS(max_pfn)); if (WARN_ON(!phys)) return -ENOMEM; - memblock_reserve(phys, size); - numa_distance = __va(phys); numa_distance_cnt = nr_node_ids; diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index fd3964d24224..59c1390cdf42 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -33,18 +33,22 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size, phys_addr_t *res_base) { phys_addr_t base; + int err = 0; end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end; align = !align ? SMP_CACHE_BYTES : align; - base = memblock_find_in_range(start, end, size, align); + base = memblock_phys_alloc_range(size, align, start, end); if (!base) return -ENOMEM; *res_base = base; - if (nomap) - return memblock_mark_nomap(base, size); + if (nomap) { + err = memblock_mark_nomap(base, size); + if (err) + memblock_free(base, size); + } - return memblock_reserve(base, size); + return err; } /* diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 4a53c3ca86bd..b066024c62e3 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -99,8 +99,6 @@ void memblock_discard(void); static inline void memblock_discard(void) {} #endif -phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, - phys_addr_t size, phys_addr_t align); void memblock_allow_resize(void); int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); int memblock_add(phys_addr_t base, phys_addr_t size); diff --git a/mm/memblock.c b/mm/memblock.c index de7b553baa50..28a813d9e955 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -315,7 +315,7 @@ static phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size, * Return: * Found address on success, 0 on failure. */ -phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, +static phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, phys_addr_t end, phys_addr_t size, phys_addr_t align) {