On Mon, Aug 2, 2021 at 8:37 AM Mike Rapoport <rppt@xxxxxxxxxx> wrote: > > From: Mike Rapoport <rppt@xxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxx> For the ACPI part: Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > --- > v2: don't change error message in arm::reserve_crashkernel(), per Russell > v1: https://lore.kernel.org/lkml/20210730104039.7047-1-rppt@xxxxxxxxxx > > arch/arm/kernel/setup.c | 18 +++++-------- > 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 | 21 +++++++++------ > 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, 78 insertions(+), 117 deletions(-) > > diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c > index f97eb2371672..67f5421b2af7 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); > + start = memblock_phys_alloc_range(crash_size, SECTION_SIZE, > + crash_base, crash_max); > if (start != crash_base) { > 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..d566478a06dd 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 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..1152a29ce109 100644 > --- a/arch/x86/mm/init.c > +++ b/arch/x86/mm/init.c > @@ -26,6 +26,7 @@ > #include <asm/pti.h> > #include <asm/text-patching.h> > #include <asm/memtype.h> > +#include <xen/xen.h> > > /* > * We need to define the tracepoints somewhere, and tlb.c > @@ -127,14 +128,12 @@ __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) > @@ -610,9 +609,15 @@ static void __init memory_map_top_down(unsigned long map_start, > unsigned long addr; > unsigned long mapped_ram_size = 0; > > + real_end = ALIGN_DOWN(map_end, PMD_SIZE); > + > /* 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); > - real_end = addr + PMD_SIZE; > + if (xen_domain()) { > + 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 */ > step_size = PMD_SIZE; > 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 > -- > 2.28.0 >
