From 078eb6aa50dc50cd85f09a22226b7e238b3397ce Mon Sep 17 00:00:00 2001 From: Pavel Tatashin Date: Thu, 5 Apr 2018 16:22:43 -0700 Subject: [PATCH] x86/mm/memory_hotplug: determine block size based on the end of boot memory Memory sections are combined into "memory block" chunks. These chunks are the units upon which memory can be added and removed. On x86, the new memory may be added after the end of the boot memory, therefore, if block size does not align with end of boot memory, memory hot-plugging/hot-removing can be broken. Memory sections are combined into "memory block" chunks. These chunks are the units upon which memory can be added and removed. On x86 the new memory may be added after the end of the boot memory, therefore, if block size does not align with end of boot memory, memory hotplugging/hotremoving can be broken. Currently, whenever machine is booted with more than 64G the block size is unconditionally increased to 2G from the base 128M. This is done in order to reduce number of memory device files in sysfs: /sys/devices/system/memory/memoryXXX We must use the largest allowed block size that aligns to the next address to be able to hotplug the next block of memory. So, when memory is larger or equal to 64G, we check the end address and find the largest block size that is still power of two but smaller or equal to 2G. Before, the fix: Run qemu with: -m 64G,slots=2,maxmem=66G -object memory-backend-ram,id=mem1,size=2G (qemu) device_add pc-dimm,id=dimm1,memdev=mem1 Block size [0x80000000] unaligned hotplug range: start 0x1040000000, size 0x80000000 acpi PNP0C80:00: add_memory failed acpi PNP0C80:00: acpi_memory_enable_device() error acpi PNP0C80:00: Enumeration failure With the fix memory is added successfully as the block size is set to 1G, and therefore aligns with start address 0x1040000000. [pasha.tatashin@oracle.com: v4] Link: http://lkml.kernel.org/r/20180215165920.8570-3-pasha.tatashin@oracle.com Link: http://lkml.kernel.org/r/20180213193159.14606-3-pasha.tatashin@oracle.com Signed-off-by: Pavel Tatashin Reviewed-by: Ingo Molnar Cc: "H. Peter Anvin" Cc: Thomas Gleixner Cc: Steven Sistare Cc: Daniel Jordan Cc: Mel Gorman Cc: Michal Hocko Cc: Greg Kroah-Hartman Cc: Vlastimil Babka Cc: Bharata B Rao Cc: Dan Williams Cc: Kirill A. Shutemov Cc: Baoquan He Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86/mm/init_64.c | 33 +++++++++++++++++++++++++++++---- 1 file changed, 29 insertions(+), 4 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 45241de..dca9abf 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1328,14 +1328,39 @@ int kern_addr_valid(unsigned long addr) return pfn_valid(pte_pfn(*pte)); } +/* + * Block size is the minimum amount of memory which can be hotplugged or + * hotremoved. It must be power of two and must be equal or larger than + * MIN_MEMORY_BLOCK_SIZE. + */ +#define MAX_BLOCK_SIZE (2UL << 30) + +/* Amount of ram needed to start using large blocks */ +#define MEM_SIZE_FOR_LARGE_BLOCK (64UL << 30) + static unsigned long probe_memory_block_size(void) { - unsigned long bz = MIN_MEMORY_BLOCK_SIZE; + unsigned long boot_mem_end = max_pfn << PAGE_SHIFT; + unsigned long bz; - /* if system is UV or has 64GB of RAM or more, use large blocks */ - if (is_uv_system() || ((max_pfn << PAGE_SHIFT) >= (64UL << 30))) - bz = 2UL << 30; /* 2GB */ + /* If this is UV system, always set 2G block size */ + if (is_uv_system()) { + bz = MAX_BLOCK_SIZE; + goto done; + } + /* Use regular block if RAM is smaller than MEM_SIZE_FOR_LARGE_BLOCK */ + if (boot_mem_end < MEM_SIZE_FOR_LARGE_BLOCK) { + bz = MIN_MEMORY_BLOCK_SIZE; + goto done; + } + + /* Find the largest allowed block size that aligns to memory end */ + for (bz = MAX_BLOCK_SIZE; bz > MIN_MEMORY_BLOCK_SIZE; bz >>= 1) { + if (IS_ALIGNED(boot_mem_end, bz)) + break; + } +done: pr_info("x86/mm: Memory block size: %ldMB\n", bz >> 20); return bz; -- 2.7.4