mirror of https://gitee.com/openkylin/linux.git
668 lines
17 KiB
C
668 lines
17 KiB
C
/*
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* Generic VM initialization for x86-64 NUMA setups.
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* Copyright 2002,2003 Andi Kleen, SuSE Labs.
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#include <linux/mmzone.h>
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#include <linux/ctype.h>
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#include <linux/module.h>
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#include <linux/nodemask.h>
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#include <linux/sched.h>
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#include <linux/acpi.h>
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#include <asm/e820.h>
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#include <asm/proto.h>
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#include <asm/dma.h>
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#include <asm/acpi.h>
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#include <asm/amd_nb.h>
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#include "numa_internal.h"
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struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
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EXPORT_SYMBOL(node_data);
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nodemask_t numa_nodes_parsed __initdata;
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struct memnode memnode;
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static unsigned long __initdata nodemap_addr;
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static unsigned long __initdata nodemap_size;
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static struct numa_meminfo numa_meminfo __initdata;
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static int numa_distance_cnt;
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static u8 *numa_distance;
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/*
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* Given a shift value, try to populate memnodemap[]
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* Returns :
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* 1 if OK
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* 0 if memnodmap[] too small (of shift too small)
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* -1 if node overlap or lost ram (shift too big)
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*/
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static int __init populate_memnodemap(const struct numa_meminfo *mi, int shift)
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{
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unsigned long addr, end;
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int i, res = -1;
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memset(memnodemap, 0xff, sizeof(s16)*memnodemapsize);
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for (i = 0; i < mi->nr_blks; i++) {
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addr = mi->blk[i].start;
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end = mi->blk[i].end;
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if (addr >= end)
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continue;
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if ((end >> shift) >= memnodemapsize)
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return 0;
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do {
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if (memnodemap[addr >> shift] != NUMA_NO_NODE)
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return -1;
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memnodemap[addr >> shift] = mi->blk[i].nid;
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addr += (1UL << shift);
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} while (addr < end);
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res = 1;
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}
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return res;
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}
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static int __init allocate_cachealigned_memnodemap(void)
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{
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unsigned long addr;
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memnodemap = memnode.embedded_map;
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if (memnodemapsize <= ARRAY_SIZE(memnode.embedded_map))
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return 0;
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addr = 0x8000;
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nodemap_size = roundup(sizeof(s16) * memnodemapsize, L1_CACHE_BYTES);
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nodemap_addr = memblock_find_in_range(addr, get_max_mapped(),
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nodemap_size, L1_CACHE_BYTES);
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if (nodemap_addr == MEMBLOCK_ERROR) {
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printk(KERN_ERR
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"NUMA: Unable to allocate Memory to Node hash map\n");
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nodemap_addr = nodemap_size = 0;
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return -1;
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}
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memnodemap = phys_to_virt(nodemap_addr);
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memblock_x86_reserve_range(nodemap_addr, nodemap_addr + nodemap_size, "MEMNODEMAP");
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printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",
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nodemap_addr, nodemap_addr + nodemap_size);
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return 0;
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}
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/*
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* The LSB of all start and end addresses in the node map is the value of the
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* maximum possible shift.
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*/
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static int __init extract_lsb_from_nodes(const struct numa_meminfo *mi)
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{
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int i, nodes_used = 0;
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unsigned long start, end;
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unsigned long bitfield = 0, memtop = 0;
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for (i = 0; i < mi->nr_blks; i++) {
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start = mi->blk[i].start;
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end = mi->blk[i].end;
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if (start >= end)
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continue;
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bitfield |= start;
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nodes_used++;
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if (end > memtop)
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memtop = end;
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}
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if (nodes_used <= 1)
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i = 63;
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else
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i = find_first_bit(&bitfield, sizeof(unsigned long)*8);
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memnodemapsize = (memtop >> i)+1;
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return i;
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}
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static int __init compute_hash_shift(const struct numa_meminfo *mi)
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{
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int shift;
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shift = extract_lsb_from_nodes(mi);
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if (allocate_cachealigned_memnodemap())
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return -1;
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printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
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shift);
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if (populate_memnodemap(mi, shift) != 1) {
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printk(KERN_INFO "Your memory is not aligned you need to "
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"rebuild your kernel with a bigger NODEMAPSIZE "
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"shift=%d\n", shift);
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return -1;
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}
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return shift;
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}
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int __meminit __early_pfn_to_nid(unsigned long pfn)
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{
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return phys_to_nid(pfn << PAGE_SHIFT);
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}
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static void * __init early_node_mem(int nodeid, unsigned long start,
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unsigned long end, unsigned long size,
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unsigned long align)
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{
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unsigned long mem;
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/*
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* put it on high as possible
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* something will go with NODE_DATA
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*/
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if (start < (MAX_DMA_PFN<<PAGE_SHIFT))
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start = MAX_DMA_PFN<<PAGE_SHIFT;
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if (start < (MAX_DMA32_PFN<<PAGE_SHIFT) &&
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end > (MAX_DMA32_PFN<<PAGE_SHIFT))
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start = MAX_DMA32_PFN<<PAGE_SHIFT;
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mem = memblock_x86_find_in_range_node(nodeid, start, end, size, align);
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if (mem != MEMBLOCK_ERROR)
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return __va(mem);
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/* extend the search scope */
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end = max_pfn_mapped << PAGE_SHIFT;
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start = MAX_DMA_PFN << PAGE_SHIFT;
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mem = memblock_find_in_range(start, end, size, align);
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if (mem != MEMBLOCK_ERROR)
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return __va(mem);
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printk(KERN_ERR "Cannot find %lu bytes in node %d\n",
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size, nodeid);
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return NULL;
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}
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static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
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struct numa_meminfo *mi)
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{
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/* ignore zero length blks */
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if (start == end)
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return 0;
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/* whine about and ignore invalid blks */
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if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
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pr_warning("NUMA: Warning: invalid memblk node %d (%Lx-%Lx)\n",
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nid, start, end);
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return 0;
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}
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if (mi->nr_blks >= NR_NODE_MEMBLKS) {
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pr_err("NUMA: too many memblk ranges\n");
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return -EINVAL;
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}
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mi->blk[mi->nr_blks].start = start;
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mi->blk[mi->nr_blks].end = end;
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mi->blk[mi->nr_blks].nid = nid;
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mi->nr_blks++;
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return 0;
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}
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/**
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* numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo
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* @idx: Index of memblk to remove
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* @mi: numa_meminfo to remove memblk from
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*
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* Remove @idx'th numa_memblk from @mi by shifting @mi->blk[] and
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* decrementing @mi->nr_blks.
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*/
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void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
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{
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mi->nr_blks--;
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memmove(&mi->blk[idx], &mi->blk[idx + 1],
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(mi->nr_blks - idx) * sizeof(mi->blk[0]));
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}
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/**
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* numa_add_memblk - Add one numa_memblk to numa_meminfo
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* @nid: NUMA node ID of the new memblk
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* @start: Start address of the new memblk
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* @end: End address of the new memblk
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*
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* Add a new memblk to the default numa_meminfo.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int __init numa_add_memblk(int nid, u64 start, u64 end)
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{
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return numa_add_memblk_to(nid, start, end, &numa_meminfo);
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}
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/* Initialize bootmem allocator for a node */
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void __init
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setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
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{
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unsigned long start_pfn, last_pfn, nodedata_phys;
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const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
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int nid;
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if (!end)
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return;
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/*
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* Don't confuse VM with a node that doesn't have the
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* minimum amount of memory:
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*/
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if (end && (end - start) < NODE_MIN_SIZE)
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return;
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start = roundup(start, ZONE_ALIGN);
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printk(KERN_INFO "Initmem setup node %d %016lx-%016lx\n", nodeid,
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start, end);
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start_pfn = start >> PAGE_SHIFT;
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last_pfn = end >> PAGE_SHIFT;
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node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size,
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SMP_CACHE_BYTES);
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if (node_data[nodeid] == NULL)
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return;
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nodedata_phys = __pa(node_data[nodeid]);
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memblock_x86_reserve_range(nodedata_phys, nodedata_phys + pgdat_size, "NODE_DATA");
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printk(KERN_INFO " NODE_DATA [%016lx - %016lx]\n", nodedata_phys,
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nodedata_phys + pgdat_size - 1);
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nid = phys_to_nid(nodedata_phys);
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if (nid != nodeid)
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printk(KERN_INFO " NODE_DATA(%d) on node %d\n", nodeid, nid);
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memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
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NODE_DATA(nodeid)->node_id = nodeid;
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NODE_DATA(nodeid)->node_start_pfn = start_pfn;
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NODE_DATA(nodeid)->node_spanned_pages = last_pfn - start_pfn;
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node_set_online(nodeid);
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}
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/**
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* numa_cleanup_meminfo - Cleanup a numa_meminfo
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* @mi: numa_meminfo to clean up
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*
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* Sanitize @mi by merging and removing unncessary memblks. Also check for
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* conflicts and clear unused memblks.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
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{
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const u64 low = 0;
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const u64 high = (u64)max_pfn << PAGE_SHIFT;
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int i, j, k;
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for (i = 0; i < mi->nr_blks; i++) {
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struct numa_memblk *bi = &mi->blk[i];
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/* make sure all blocks are inside the limits */
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bi->start = max(bi->start, low);
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bi->end = min(bi->end, high);
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/* and there's no empty block */
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if (bi->start == bi->end) {
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numa_remove_memblk_from(i--, mi);
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continue;
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}
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for (j = i + 1; j < mi->nr_blks; j++) {
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struct numa_memblk *bj = &mi->blk[j];
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unsigned long start, end;
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/*
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* See whether there are overlapping blocks. Whine
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* about but allow overlaps of the same nid. They
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* will be merged below.
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*/
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if (bi->end > bj->start && bi->start < bj->end) {
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if (bi->nid != bj->nid) {
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pr_err("NUMA: node %d (%Lx-%Lx) overlaps with node %d (%Lx-%Lx)\n",
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bi->nid, bi->start, bi->end,
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bj->nid, bj->start, bj->end);
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return -EINVAL;
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}
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pr_warning("NUMA: Warning: node %d (%Lx-%Lx) overlaps with itself (%Lx-%Lx)\n",
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bi->nid, bi->start, bi->end,
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bj->start, bj->end);
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}
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/*
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* Join together blocks on the same node, holes
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* between which don't overlap with memory on other
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* nodes.
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*/
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if (bi->nid != bj->nid)
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continue;
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start = max(min(bi->start, bj->start), low);
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end = min(max(bi->end, bj->end), high);
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for (k = 0; k < mi->nr_blks; k++) {
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struct numa_memblk *bk = &mi->blk[k];
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if (bi->nid == bk->nid)
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continue;
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if (start < bk->end && end > bk->start)
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break;
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}
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if (k < mi->nr_blks)
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continue;
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printk(KERN_INFO "NUMA: Node %d [%Lx,%Lx) + [%Lx,%Lx) -> [%lx,%lx)\n",
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bi->nid, bi->start, bi->end, bj->start, bj->end,
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start, end);
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bi->start = start;
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bi->end = end;
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numa_remove_memblk_from(j--, mi);
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}
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}
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for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
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mi->blk[i].start = mi->blk[i].end = 0;
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mi->blk[i].nid = NUMA_NO_NODE;
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}
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return 0;
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}
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/*
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* Set nodes, which have memory in @mi, in *@nodemask.
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*/
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static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
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const struct numa_meminfo *mi)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
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if (mi->blk[i].start != mi->blk[i].end &&
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mi->blk[i].nid != NUMA_NO_NODE)
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node_set(mi->blk[i].nid, *nodemask);
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}
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/**
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* numa_reset_distance - Reset NUMA distance table
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*
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* The current table is freed. The next numa_set_distance() call will
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* create a new one.
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*/
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void __init numa_reset_distance(void)
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{
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size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
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/* numa_distance could be 1LU marking allocation failure, test cnt */
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if (numa_distance_cnt)
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memblock_x86_free_range(__pa(numa_distance),
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__pa(numa_distance) + size);
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numa_distance_cnt = 0;
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numa_distance = NULL; /* enable table creation */
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}
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static int __init numa_alloc_distance(void)
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{
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nodemask_t nodes_parsed;
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size_t size;
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int i, j, cnt = 0;
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u64 phys;
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/* size the new table and allocate it */
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nodes_parsed = numa_nodes_parsed;
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numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
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for_each_node_mask(i, nodes_parsed)
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cnt = i;
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cnt++;
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size = cnt * cnt * sizeof(numa_distance[0]);
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phys = memblock_find_in_range(0, (u64)max_pfn_mapped << PAGE_SHIFT,
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size, PAGE_SIZE);
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if (phys == MEMBLOCK_ERROR) {
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pr_warning("NUMA: Warning: can't allocate distance table!\n");
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/* don't retry until explicitly reset */
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numa_distance = (void *)1LU;
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return -ENOMEM;
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}
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memblock_x86_reserve_range(phys, phys + size, "NUMA DIST");
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numa_distance = __va(phys);
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numa_distance_cnt = cnt;
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/* fill with the default distances */
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for (i = 0; i < cnt; i++)
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for (j = 0; j < cnt; j++)
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numa_distance[i * cnt + j] = i == j ?
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LOCAL_DISTANCE : REMOTE_DISTANCE;
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printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
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return 0;
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}
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/**
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* numa_set_distance - Set NUMA distance from one NUMA to another
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* @from: the 'from' node to set distance
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* @to: the 'to' node to set distance
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* @distance: NUMA distance
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*
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* Set the distance from node @from to @to to @distance. If distance table
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* doesn't exist, one which is large enough to accommodate all the currently
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* known nodes will be created.
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*
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* If such table cannot be allocated, a warning is printed and further
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* calls are ignored until the distance table is reset with
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* numa_reset_distance().
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*
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* If @from or @to is higher than the highest known node at the time of
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* table creation or @distance doesn't make sense, the call is ignored.
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* This is to allow simplification of specific NUMA config implementations.
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*/
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void __init numa_set_distance(int from, int to, int distance)
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{
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if (!numa_distance && numa_alloc_distance() < 0)
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return;
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if (from >= numa_distance_cnt || to >= numa_distance_cnt) {
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printk_once(KERN_DEBUG "NUMA: Debug: distance out of bound, from=%d to=%d distance=%d\n",
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from, to, distance);
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return;
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}
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if ((u8)distance != distance ||
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(from == to && distance != LOCAL_DISTANCE)) {
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pr_warn_once("NUMA: Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
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from, to, distance);
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return;
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}
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numa_distance[from * numa_distance_cnt + to] = distance;
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}
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int __node_distance(int from, int to)
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{
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if (from >= numa_distance_cnt || to >= numa_distance_cnt)
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return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
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return numa_distance[from * numa_distance_cnt + to];
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}
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EXPORT_SYMBOL(__node_distance);
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/*
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* Sanity check to catch more bad NUMA configurations (they are amazingly
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* common). Make sure the nodes cover all memory.
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*/
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static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
|
|
{
|
|
unsigned long numaram, e820ram;
|
|
int i;
|
|
|
|
numaram = 0;
|
|
for (i = 0; i < mi->nr_blks; i++) {
|
|
unsigned long s = mi->blk[i].start >> PAGE_SHIFT;
|
|
unsigned long e = mi->blk[i].end >> PAGE_SHIFT;
|
|
numaram += e - s;
|
|
numaram -= __absent_pages_in_range(mi->blk[i].nid, s, e);
|
|
if ((long)numaram < 0)
|
|
numaram = 0;
|
|
}
|
|
|
|
e820ram = max_pfn - (memblock_x86_hole_size(0,
|
|
max_pfn << PAGE_SHIFT) >> PAGE_SHIFT);
|
|
/* We seem to lose 3 pages somewhere. Allow 1M of slack. */
|
|
if ((long)(e820ram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
|
|
printk(KERN_ERR "NUMA: nodes only cover %luMB of your %luMB e820 RAM. Not used.\n",
|
|
(numaram << PAGE_SHIFT) >> 20,
|
|
(e820ram << PAGE_SHIFT) >> 20);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static int __init numa_register_memblks(struct numa_meminfo *mi)
|
|
{
|
|
int i, nid;
|
|
|
|
/* Account for nodes with cpus and no memory */
|
|
node_possible_map = numa_nodes_parsed;
|
|
numa_nodemask_from_meminfo(&node_possible_map, mi);
|
|
if (WARN_ON(nodes_empty(node_possible_map)))
|
|
return -EINVAL;
|
|
|
|
memnode_shift = compute_hash_shift(mi);
|
|
if (memnode_shift < 0) {
|
|
printk(KERN_ERR "NUMA: No NUMA node hash function found. Contact maintainer\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < mi->nr_blks; i++)
|
|
memblock_x86_register_active_regions(mi->blk[i].nid,
|
|
mi->blk[i].start >> PAGE_SHIFT,
|
|
mi->blk[i].end >> PAGE_SHIFT);
|
|
|
|
/* for out of order entries */
|
|
sort_node_map();
|
|
if (!numa_meminfo_cover_memory(mi))
|
|
return -EINVAL;
|
|
|
|
/* Finally register nodes. */
|
|
for_each_node_mask(nid, node_possible_map) {
|
|
u64 start = (u64)max_pfn << PAGE_SHIFT;
|
|
u64 end = 0;
|
|
|
|
for (i = 0; i < mi->nr_blks; i++) {
|
|
if (nid != mi->blk[i].nid)
|
|
continue;
|
|
start = min(mi->blk[i].start, start);
|
|
end = max(mi->blk[i].end, end);
|
|
}
|
|
|
|
if (start < end)
|
|
setup_node_bootmem(nid, start, end);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dummy_numma_init - Fallback dummy NUMA init
|
|
*
|
|
* Used if there's no underlying NUMA architecture, NUMA initialization
|
|
* fails, or NUMA is disabled on the command line.
|
|
*
|
|
* Must online at least one node and add memory blocks that cover all
|
|
* allowed memory. This function must not fail.
|
|
*/
|
|
static int __init dummy_numa_init(void)
|
|
{
|
|
printk(KERN_INFO "%s\n",
|
|
numa_off ? "NUMA turned off" : "No NUMA configuration found");
|
|
printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
|
|
0LU, max_pfn << PAGE_SHIFT);
|
|
|
|
node_set(0, numa_nodes_parsed);
|
|
numa_add_memblk(0, 0, (u64)max_pfn << PAGE_SHIFT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init numa_init(int (*init_func)(void))
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
for (i = 0; i < MAX_LOCAL_APIC; i++)
|
|
set_apicid_to_node(i, NUMA_NO_NODE);
|
|
|
|
nodes_clear(numa_nodes_parsed);
|
|
nodes_clear(node_possible_map);
|
|
nodes_clear(node_online_map);
|
|
memset(&numa_meminfo, 0, sizeof(numa_meminfo));
|
|
remove_all_active_ranges();
|
|
numa_reset_distance();
|
|
|
|
ret = init_func();
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = numa_cleanup_meminfo(&numa_meminfo);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
numa_emulation(&numa_meminfo, numa_distance_cnt);
|
|
|
|
ret = numa_register_memblks(&numa_meminfo);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < nr_cpu_ids; i++) {
|
|
int nid = early_cpu_to_node(i);
|
|
|
|
if (nid == NUMA_NO_NODE)
|
|
continue;
|
|
if (!node_online(nid))
|
|
numa_clear_node(i);
|
|
}
|
|
numa_init_array();
|
|
return 0;
|
|
}
|
|
|
|
void __init initmem_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!numa_off) {
|
|
#ifdef CONFIG_ACPI_NUMA
|
|
ret = numa_init(x86_acpi_numa_init);
|
|
if (!ret)
|
|
return;
|
|
#endif
|
|
#ifdef CONFIG_AMD_NUMA
|
|
ret = numa_init(amd_numa_init);
|
|
if (!ret)
|
|
return;
|
|
#endif
|
|
}
|
|
|
|
numa_init(dummy_numa_init);
|
|
}
|
|
|
|
unsigned long __init numa_free_all_bootmem(void)
|
|
{
|
|
unsigned long pages = 0;
|
|
int i;
|
|
|
|
for_each_online_node(i)
|
|
pages += free_all_bootmem_node(NODE_DATA(i));
|
|
|
|
pages += free_all_memory_core_early(MAX_NUMNODES);
|
|
|
|
return pages;
|
|
}
|
|
|
|
int __cpuinit numa_cpu_node(int cpu)
|
|
{
|
|
int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
|
|
|
|
if (apicid != BAD_APICID)
|
|
return __apicid_to_node[apicid];
|
|
return NUMA_NO_NODE;
|
|
}
|