425 lines
11 KiB
C
425 lines
11 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/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 <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/numa.h>
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#include <asm/acpi.h>
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#ifndef Dprintk
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#define Dprintk(x...)
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#endif
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struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
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bootmem_data_t plat_node_bdata[MAX_NUMNODES];
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struct memnode memnode;
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unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
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[0 ... NR_CPUS-1] = NUMA_NO_NODE
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};
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unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
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[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
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};
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cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly;
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int numa_off __initdata;
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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
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populate_memnodemap(const struct bootnode *nodes, int numnodes, int shift)
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{
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int i;
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int res = -1;
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unsigned long addr, end;
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if (shift >= 64)
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return -1;
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memset(memnodemap, 0xff, sizeof(memnodemap));
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for (i = 0; i < numnodes; i++) {
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addr = nodes[i].start;
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end = nodes[i].end;
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if (addr >= end)
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continue;
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if ((end >> shift) >= NODEMAPSIZE)
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return 0;
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do {
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if (memnodemap[addr >> shift] != 0xff)
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return -1;
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memnodemap[addr >> shift] = i;
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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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int __init compute_hash_shift(struct bootnode *nodes, int numnodes)
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{
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int shift = 20;
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while (populate_memnodemap(nodes, numnodes, shift + 1) >= 0)
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shift++;
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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(nodes, numnodes, shift) != 1) {
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printk(KERN_INFO
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"Your memory is not aligned you need to rebuild your kernel "
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"with a bigger NODEMAPSIZE shift=%d\n",
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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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#ifdef CONFIG_SPARSEMEM
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int 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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#endif
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static void * __init
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early_node_mem(int nodeid, unsigned long start, unsigned long end,
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unsigned long size)
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{
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unsigned long mem = find_e820_area(start, end, size);
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void *ptr;
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if (mem != -1L)
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return __va(mem);
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ptr = __alloc_bootmem_nopanic(size,
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SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS));
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if (ptr == 0) {
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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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return ptr;
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}
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/* Initialize bootmem allocator for a node */
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void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
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{
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unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start;
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unsigned long nodedata_phys;
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void *bootmap;
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const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE);
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start = round_up(start, ZONE_ALIGN);
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printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);
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start_pfn = start >> PAGE_SHIFT;
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end_pfn = end >> PAGE_SHIFT;
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node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size);
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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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memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
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NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid];
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NODE_DATA(nodeid)->node_start_pfn = start_pfn;
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NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn;
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/* Find a place for the bootmem map */
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bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
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bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
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bootmap = early_node_mem(nodeid, bootmap_start, end,
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bootmap_pages<<PAGE_SHIFT);
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if (bootmap == NULL) {
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if (nodedata_phys < start || nodedata_phys >= end)
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free_bootmem((unsigned long)node_data[nodeid],pgdat_size);
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node_data[nodeid] = NULL;
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return;
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}
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bootmap_start = __pa(bootmap);
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Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages);
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bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
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bootmap_start >> PAGE_SHIFT,
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start_pfn, end_pfn);
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e820_bootmem_free(NODE_DATA(nodeid), start, end);
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reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size);
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reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
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#ifdef CONFIG_ACPI_NUMA
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srat_reserve_add_area(nodeid);
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#endif
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node_set_online(nodeid);
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}
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/* Initialize final allocator for a zone */
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void __init setup_node_zones(int nodeid)
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{
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unsigned long start_pfn, end_pfn, memmapsize, limit;
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unsigned long zones[MAX_NR_ZONES];
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unsigned long holes[MAX_NR_ZONES];
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start_pfn = node_start_pfn(nodeid);
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end_pfn = node_end_pfn(nodeid);
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Dprintk(KERN_INFO "Setting up node %d %lx-%lx\n",
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nodeid, start_pfn, end_pfn);
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/* Try to allocate mem_map at end to not fill up precious <4GB
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memory. */
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memmapsize = sizeof(struct page) * (end_pfn-start_pfn);
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limit = end_pfn << PAGE_SHIFT;
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#ifdef CONFIG_FLAT_NODE_MEM_MAP
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NODE_DATA(nodeid)->node_mem_map =
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__alloc_bootmem_core(NODE_DATA(nodeid)->bdata,
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memmapsize, SMP_CACHE_BYTES,
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round_down(limit - memmapsize, PAGE_SIZE),
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limit);
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#endif
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size_zones(zones, holes, start_pfn, end_pfn);
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free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
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start_pfn, holes);
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}
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void __init numa_init_array(void)
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{
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int rr, i;
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/* There are unfortunately some poorly designed mainboards around
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that only connect memory to a single CPU. This breaks the 1:1 cpu->node
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mapping. To avoid this fill in the mapping for all possible
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CPUs, as the number of CPUs is not known yet.
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We round robin the existing nodes. */
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rr = first_node(node_online_map);
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for (i = 0; i < NR_CPUS; i++) {
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if (cpu_to_node[i] != NUMA_NO_NODE)
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continue;
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numa_set_node(i, rr);
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rr = next_node(rr, node_online_map);
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if (rr == MAX_NUMNODES)
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rr = first_node(node_online_map);
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}
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}
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#ifdef CONFIG_NUMA_EMU
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int numa_fake __initdata = 0;
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/* Numa emulation */
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static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
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{
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int i;
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struct bootnode nodes[MAX_NUMNODES];
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unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake;
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/* Kludge needed for the hash function */
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if (hweight64(sz) > 1) {
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unsigned long x = 1;
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while ((x << 1) < sz)
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x <<= 1;
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if (x < sz/2)
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printk(KERN_ERR "Numa emulation unbalanced. Complain to maintainer\n");
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sz = x;
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}
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memset(&nodes,0,sizeof(nodes));
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for (i = 0; i < numa_fake; i++) {
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nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz;
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if (i == numa_fake-1)
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sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start;
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nodes[i].end = nodes[i].start + sz;
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printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
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i,
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nodes[i].start, nodes[i].end,
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(nodes[i].end - nodes[i].start) >> 20);
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node_set_online(i);
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}
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memnode_shift = compute_hash_shift(nodes, numa_fake);
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if (memnode_shift < 0) {
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memnode_shift = 0;
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printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
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return -1;
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}
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for_each_online_node(i)
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setup_node_bootmem(i, nodes[i].start, nodes[i].end);
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numa_init_array();
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return 0;
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}
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#endif
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void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
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{
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int i;
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#ifdef CONFIG_NUMA_EMU
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if (numa_fake && !numa_emulation(start_pfn, end_pfn))
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return;
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#endif
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#ifdef CONFIG_ACPI_NUMA
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if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
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end_pfn << PAGE_SHIFT))
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return;
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#endif
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#ifdef CONFIG_K8_NUMA
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if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
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return;
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#endif
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printk(KERN_INFO "%s\n",
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numa_off ? "NUMA turned off" : "No NUMA configuration found");
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printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
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start_pfn << PAGE_SHIFT,
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end_pfn << PAGE_SHIFT);
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/* setup dummy node covering all memory */
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memnode_shift = 63;
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memnodemap[0] = 0;
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nodes_clear(node_online_map);
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node_set_online(0);
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for (i = 0; i < NR_CPUS; i++)
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numa_set_node(i, 0);
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node_to_cpumask[0] = cpumask_of_cpu(0);
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setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
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}
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__cpuinit void numa_add_cpu(int cpu)
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{
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set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
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}
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void __cpuinit numa_set_node(int cpu, int node)
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{
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cpu_pda(cpu)->nodenumber = node;
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cpu_to_node[cpu] = node;
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}
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unsigned long __init numa_free_all_bootmem(void)
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{
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int i;
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unsigned long pages = 0;
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for_each_online_node(i) {
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pages += free_all_bootmem_node(NODE_DATA(i));
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}
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return pages;
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}
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#ifdef CONFIG_SPARSEMEM
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static void __init arch_sparse_init(void)
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{
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int i;
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for_each_online_node(i)
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memory_present(i, node_start_pfn(i), node_end_pfn(i));
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sparse_init();
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}
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#else
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#define arch_sparse_init() do {} while (0)
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#endif
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void __init paging_init(void)
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{
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int i;
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arch_sparse_init();
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for_each_online_node(i) {
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setup_node_zones(i);
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}
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}
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static __init int numa_setup(char *opt)
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{
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if (!opt)
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return -EINVAL;
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if (!strncmp(opt,"off",3))
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numa_off = 1;
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#ifdef CONFIG_NUMA_EMU
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if(!strncmp(opt, "fake=", 5)) {
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numa_fake = simple_strtoul(opt+5,NULL,0); ;
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if (numa_fake >= MAX_NUMNODES)
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numa_fake = MAX_NUMNODES;
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}
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#endif
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#ifdef CONFIG_ACPI_NUMA
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if (!strncmp(opt,"noacpi",6))
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acpi_numa = -1;
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if (!strncmp(opt,"hotadd=", 7))
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hotadd_percent = simple_strtoul(opt+7, NULL, 10);
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#endif
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return 0;
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}
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early_param("numa", numa_setup);
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/*
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* Setup early cpu_to_node.
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*
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* Populate cpu_to_node[] only if x86_cpu_to_apicid[],
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* and apicid_to_node[] tables have valid entries for a CPU.
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* This means we skip cpu_to_node[] initialisation for NUMA
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* emulation and faking node case (when running a kernel compiled
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* for NUMA on a non NUMA box), which is OK as cpu_to_node[]
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* is already initialized in a round robin manner at numa_init_array,
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* prior to this call, and this initialization is good enough
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* for the fake NUMA cases.
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*/
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void __init init_cpu_to_node(void)
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{
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int i;
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for (i = 0; i < NR_CPUS; i++) {
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u8 apicid = x86_cpu_to_apicid[i];
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if (apicid == BAD_APICID)
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continue;
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if (apicid_to_node[apicid] == NUMA_NO_NODE)
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continue;
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numa_set_node(i,apicid_to_node[apicid]);
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}
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}
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EXPORT_SYMBOL(cpu_to_node);
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EXPORT_SYMBOL(node_to_cpumask);
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EXPORT_SYMBOL(memnode);
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EXPORT_SYMBOL(node_data);
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* Functions to convert PFNs from/to per node page addresses.
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* These are out of line because they are quite big.
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* They could be all tuned by pre caching more state.
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* Should do that.
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*/
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int pfn_valid(unsigned long pfn)
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{
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unsigned nid;
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if (pfn >= num_physpages)
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return 0;
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nid = pfn_to_nid(pfn);
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if (nid == 0xff)
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return 0;
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return pfn >= node_start_pfn(nid) && (pfn) < node_end_pfn(nid);
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}
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EXPORT_SYMBOL(pfn_valid);
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#endif
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