diff options
Diffstat (limited to 'arch/x86_64/mm/numa.c')
| -rw-r--r-- | arch/x86_64/mm/numa.c | 555 |
1 files changed, 0 insertions, 555 deletions
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c deleted file mode 100644 index 41b8fb06992..00000000000 --- a/arch/x86_64/mm/numa.c +++ /dev/null @@ -1,555 +0,0 @@ -/* - * Generic VM initialization for x86-64 NUMA setups. - * Copyright 2002,2003 Andi Kleen, SuSE Labs. - */ -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/string.h> -#include <linux/init.h> -#include <linux/bootmem.h> -#include <linux/mmzone.h> -#include <linux/ctype.h> -#include <linux/module.h> -#include <linux/nodemask.h> - -#include <asm/e820.h> -#include <asm/proto.h> -#include <asm/dma.h> -#include <asm/numa.h> -#include <asm/acpi.h> - -#ifndef Dprintk -#define Dprintk(x...) -#endif - -struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; -bootmem_data_t plat_node_bdata[MAX_NUMNODES]; - -struct memnode memnode; - -unsigned char cpu_to_node[NR_CPUS] __read_mostly = { - [0 ... NR_CPUS-1] = NUMA_NO_NODE -}; -unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = { - [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE -}; -cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly; - -int numa_off __initdata; -unsigned long __initdata nodemap_addr; -unsigned long __initdata nodemap_size; - - -/* - * Given a shift value, try to populate memnodemap[] - * Returns : - * 1 if OK - * 0 if memnodmap[] too small (of shift too small) - * -1 if node overlap or lost ram (shift too big) - */ -static int __init -populate_memnodemap(const struct bootnode *nodes, int numnodes, int shift) -{ - int i; - int res = -1; - unsigned long addr, end; - - memset(memnodemap, 0xff, memnodemapsize); - for (i = 0; i < numnodes; i++) { - addr = nodes[i].start; - end = nodes[i].end; - if (addr >= end) - continue; - if ((end >> shift) >= memnodemapsize) - return 0; - do { - if (memnodemap[addr >> shift] != 0xff) - return -1; - memnodemap[addr >> shift] = i; - addr += (1UL << shift); - } while (addr < end); - res = 1; - } - return res; -} - -static int __init allocate_cachealigned_memnodemap(void) -{ - unsigned long pad, pad_addr; - - memnodemap = memnode.embedded_map; - if (memnodemapsize <= 48) - return 0; - - pad = L1_CACHE_BYTES - 1; - pad_addr = 0x8000; - nodemap_size = pad + memnodemapsize; - nodemap_addr = find_e820_area(pad_addr, end_pfn<<PAGE_SHIFT, - nodemap_size); - if (nodemap_addr == -1UL) { - printk(KERN_ERR - "NUMA: Unable to allocate Memory to Node hash map\n"); - nodemap_addr = nodemap_size = 0; - return -1; - } - pad_addr = (nodemap_addr + pad) & ~pad; - memnodemap = phys_to_virt(pad_addr); - - printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n", - nodemap_addr, nodemap_addr + nodemap_size); - return 0; -} - -/* - * The LSB of all start and end addresses in the node map is the value of the - * maximum possible shift. - */ -static int __init -extract_lsb_from_nodes (const struct bootnode *nodes, int numnodes) -{ - int i, nodes_used = 0; - unsigned long start, end; - unsigned long bitfield = 0, memtop = 0; - - for (i = 0; i < numnodes; i++) { - start = nodes[i].start; - end = nodes[i].end; - if (start >= end) - continue; - bitfield |= start; - nodes_used++; - if (end > memtop) - memtop = end; - } - if (nodes_used <= 1) - i = 63; - else - i = find_first_bit(&bitfield, sizeof(unsigned long)*8); - memnodemapsize = (memtop >> i)+1; - return i; -} - -int __init compute_hash_shift(struct bootnode *nodes, int numnodes) -{ - int shift; - - shift = extract_lsb_from_nodes(nodes, numnodes); - if (allocate_cachealigned_memnodemap()) - return -1; - printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n", - shift); - - if (populate_memnodemap(nodes, numnodes, shift) != 1) { - printk(KERN_INFO - "Your memory is not aligned you need to rebuild your kernel " - "with a bigger NODEMAPSIZE shift=%d\n", - shift); - return -1; - } - return shift; -} - -#ifdef CONFIG_SPARSEMEM -int early_pfn_to_nid(unsigned long pfn) -{ - return phys_to_nid(pfn << PAGE_SHIFT); -} -#endif - -static void * __init -early_node_mem(int nodeid, unsigned long start, unsigned long end, - unsigned long size) -{ - unsigned long mem = find_e820_area(start, end, size); - void *ptr; - if (mem != -1L) - return __va(mem); - ptr = __alloc_bootmem_nopanic(size, - SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS)); - if (ptr == 0) { - printk(KERN_ERR "Cannot find %lu bytes in node %d\n", - size, nodeid); - return NULL; - } - return ptr; -} - -/* Initialize bootmem allocator for a node */ -void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end) -{ - unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start; - unsigned long nodedata_phys; - void *bootmap; - const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE); - - start = round_up(start, ZONE_ALIGN); - - printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end); - - start_pfn = start >> PAGE_SHIFT; - end_pfn = end >> PAGE_SHIFT; - - node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size); - if (node_data[nodeid] == NULL) - return; - nodedata_phys = __pa(node_data[nodeid]); - - memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t)); - NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid]; - NODE_DATA(nodeid)->node_start_pfn = start_pfn; - NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn; - - /* Find a place for the bootmem map */ - bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); - bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE); - bootmap = early_node_mem(nodeid, bootmap_start, end, - bootmap_pages<<PAGE_SHIFT); - if (bootmap == NULL) { - if (nodedata_phys < start || nodedata_phys >= end) - free_bootmem((unsigned long)node_data[nodeid],pgdat_size); - node_data[nodeid] = NULL; - return; - } - bootmap_start = __pa(bootmap); - Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages); - - bootmap_size = init_bootmem_node(NODE_DATA(nodeid), - bootmap_start >> PAGE_SHIFT, - start_pfn, end_pfn); - - free_bootmem_with_active_regions(nodeid, end); - - reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); - reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT); -#ifdef CONFIG_ACPI_NUMA - srat_reserve_add_area(nodeid); -#endif - node_set_online(nodeid); -} - -/* Initialize final allocator for a zone */ -void __init setup_node_zones(int nodeid) -{ - unsigned long start_pfn, end_pfn, memmapsize, limit; - - start_pfn = node_start_pfn(nodeid); - end_pfn = node_end_pfn(nodeid); - - Dprintk(KERN_INFO "Setting up memmap for node %d %lx-%lx\n", - nodeid, start_pfn, end_pfn); - - /* Try to allocate mem_map at end to not fill up precious <4GB - memory. */ - memmapsize = sizeof(struct page) * (end_pfn-start_pfn); - limit = end_pfn << PAGE_SHIFT; -#ifdef CONFIG_FLAT_NODE_MEM_MAP - NODE_DATA(nodeid)->node_mem_map = - __alloc_bootmem_core(NODE_DATA(nodeid)->bdata, - memmapsize, SMP_CACHE_BYTES, - round_down(limit - memmapsize, PAGE_SIZE), - limit); -#endif -} - -void __init numa_init_array(void) -{ - int rr, i; - /* There are unfortunately some poorly designed mainboards around - that only connect memory to a single CPU. This breaks the 1:1 cpu->node - mapping. To avoid this fill in the mapping for all possible - CPUs, as the number of CPUs is not known yet. - We round robin the existing nodes. */ - rr = first_node(node_online_map); - for (i = 0; i < NR_CPUS; i++) { - if (cpu_to_node[i] != NUMA_NO_NODE) - continue; - numa_set_node(i, rr); - rr = next_node(rr, node_online_map); - if (rr == MAX_NUMNODES) - rr = first_node(node_online_map); - } - -} - -#ifdef CONFIG_NUMA_EMU -/* Numa emulation */ -int numa_fake __initdata = 0; - -/* - * This function is used to find out if the start and end correspond to - * different zones. - */ -int zone_cross_over(unsigned long start, unsigned long end) -{ - if ((start < (MAX_DMA32_PFN << PAGE_SHIFT)) && - (end >= (MAX_DMA32_PFN << PAGE_SHIFT))) - return 1; - return 0; -} - -static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn) -{ - int i, big; - struct bootnode nodes[MAX_NUMNODES]; - unsigned long sz, old_sz; - unsigned long hole_size; - unsigned long start, end; - unsigned long max_addr = (end_pfn << PAGE_SHIFT); - - start = (start_pfn << PAGE_SHIFT); - hole_size = e820_hole_size(start, max_addr); - sz = (max_addr - start - hole_size) / numa_fake; - - /* Kludge needed for the hash function */ - - old_sz = sz; - /* - * Round down to the nearest FAKE_NODE_MIN_SIZE. - */ - sz &= FAKE_NODE_MIN_HASH_MASK; - - /* - * We ensure that each node is at least 64MB big. Smaller than this - * size can cause VM hiccups. - */ - if (sz == 0) { - printk(KERN_INFO "Not enough memory for %d nodes. Reducing " - "the number of nodes\n", numa_fake); - numa_fake = (max_addr - start - hole_size) / FAKE_NODE_MIN_SIZE; - printk(KERN_INFO "Number of fake nodes will be = %d\n", - numa_fake); - sz = FAKE_NODE_MIN_SIZE; - } - /* - * Find out how many nodes can get an extra NODE_MIN_SIZE granule. - * This logic ensures the extra memory gets distributed among as many - * nodes as possible (as compared to one single node getting all that - * extra memory. - */ - big = ((old_sz - sz) * numa_fake) / FAKE_NODE_MIN_SIZE; - printk(KERN_INFO "Fake node Size: %luMB hole_size: %luMB big nodes: " - "%d\n", - (sz >> 20), (hole_size >> 20), big); - memset(&nodes,0,sizeof(nodes)); - end = start; - for (i = 0; i < numa_fake; i++) { - /* - * In case we are not able to allocate enough memory for all - * the nodes, we reduce the number of fake nodes. - */ - if (end >= max_addr) { - numa_fake = i - 1; - break; - } - start = nodes[i].start = end; - /* - * Final node can have all the remaining memory. - */ - if (i == numa_fake-1) - sz = max_addr - start; - end = nodes[i].start + sz; - /* - * Fir "big" number of nodes get extra granule. - */ - if (i < big) - end += FAKE_NODE_MIN_SIZE; - /* - * Iterate over the range to ensure that this node gets at - * least sz amount of RAM (excluding holes) - */ - while ((end - start - e820_hole_size(start, end)) < sz) { - end += FAKE_NODE_MIN_SIZE; - if (end >= max_addr) - break; - } - /* - * Look at the next node to make sure there is some real memory - * to map. Bad things happen when the only memory present - * in a zone on a fake node is IO hole. - */ - while (e820_hole_size(end, end + FAKE_NODE_MIN_SIZE) > 0) { - if (zone_cross_over(start, end + sz)) { - end = (MAX_DMA32_PFN << PAGE_SHIFT); - break; - } - if (end >= max_addr) - break; - end += FAKE_NODE_MIN_SIZE; - } - if (end > max_addr) - end = max_addr; - nodes[i].end = end; - printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", - i, - nodes[i].start, nodes[i].end, - (nodes[i].end - nodes[i].start) >> 20); - node_set_online(i); - } - memnode_shift = compute_hash_shift(nodes, numa_fake); - if (memnode_shift < 0) { - memnode_shift = 0; - printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n"); - return -1; - } - for_each_online_node(i) { - e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT, - nodes[i].end >> PAGE_SHIFT); - setup_node_bootmem(i, nodes[i].start, nodes[i].end); - } - numa_init_array(); - return 0; -} -#endif - -void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn) -{ - int i; - -#ifdef CONFIG_NUMA_EMU - if (numa_fake && !numa_emulation(start_pfn, end_pfn)) - return; -#endif - -#ifdef CONFIG_ACPI_NUMA - if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT, - end_pfn << PAGE_SHIFT)) - return; -#endif - -#ifdef CONFIG_K8_NUMA - if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT)) - return; -#endif - printk(KERN_INFO "%s\n", - numa_off ? "NUMA turned off" : "No NUMA configuration found"); - - printk(KERN_INFO "Faking a node at %016lx-%016lx\n", - start_pfn << PAGE_SHIFT, - end_pfn << PAGE_SHIFT); - /* setup dummy node covering all memory */ - memnode_shift = 63; - memnodemap = memnode.embedded_map; - memnodemap[0] = 0; - nodes_clear(node_online_map); - node_set_online(0); - for (i = 0; i < NR_CPUS; i++) - numa_set_node(i, 0); - node_to_cpumask[0] = cpumask_of_cpu(0); - e820_register_active_regions(0, start_pfn, end_pfn); - setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT); -} - -__cpuinit void numa_add_cpu(int cpu) -{ - set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]); -} - -void __cpuinit numa_set_node(int cpu, int node) -{ - cpu_pda(cpu)->nodenumber = node; - cpu_to_node[cpu] = node; -} - -unsigned long __init numa_free_all_bootmem(void) -{ - int i; - unsigned long pages = 0; - for_each_online_node(i) { - pages += free_all_bootmem_node(NODE_DATA(i)); - } - return pages; -} - -void __init paging_init(void) -{ - int i; - unsigned long max_zone_pfns[MAX_NR_ZONES]; - memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); - max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; - max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; - max_zone_pfns[ZONE_NORMAL] = end_pfn; - - sparse_memory_present_with_active_regions(MAX_NUMNODES); - sparse_init(); - - for_each_online_node(i) { - setup_node_zones(i); - } - - free_area_init_nodes(max_zone_pfns); -} - -static __init int numa_setup(char *opt) -{ - if (!opt) - return -EINVAL; - if (!strncmp(opt,"off",3)) - numa_off = 1; -#ifdef CONFIG_NUMA_EMU - if(!strncmp(opt, "fake=", 5)) { - numa_fake = simple_strtoul(opt+5,NULL,0); ; - if (numa_fake >= MAX_NUMNODES) - numa_fake = MAX_NUMNODES; - } -#endif -#ifdef CONFIG_ACPI_NUMA - if (!strncmp(opt,"noacpi",6)) - acpi_numa = -1; - if (!strncmp(opt,"hotadd=", 7)) - hotadd_percent = simple_strtoul(opt+7, NULL, 10); -#endif - return 0; -} - -early_param("numa", numa_setup); - -/* - * Setup early cpu_to_node. - * - * Populate cpu_to_node[] only if x86_cpu_to_apicid[], - * and apicid_to_node[] tables have valid entries for a CPU. - * This means we skip cpu_to_node[] initialisation for NUMA - * emulation and faking node case (when running a kernel compiled - * for NUMA on a non NUMA box), which is OK as cpu_to_node[] - * is already initialized in a round robin manner at numa_init_array, - * prior to this call, and this initialization is good enough - * for the fake NUMA cases. - */ -void __init init_cpu_to_node(void) -{ - int i; - for (i = 0; i < NR_CPUS; i++) { - u8 apicid = x86_cpu_to_apicid[i]; - if (apicid == BAD_APICID) - continue; - if (apicid_to_node[apicid] == NUMA_NO_NODE) - continue; - numa_set_node(i,apicid_to_node[apicid]); - } -} - -EXPORT_SYMBOL(cpu_to_node); -EXPORT_SYMBOL(node_to_cpumask); -EXPORT_SYMBOL(memnode); -EXPORT_SYMBOL(node_data); - -#ifdef CONFIG_DISCONTIGMEM -/* - * Functions to convert PFNs from/to per node page addresses. - * These are out of line because they are quite big. - * They could be all tuned by pre caching more state. - * Should do that. - */ - -int pfn_valid(unsigned long pfn) -{ - unsigned nid; - if (pfn >= num_physpages) - return 0; - nid = pfn_to_nid(pfn); - if (nid == 0xff) - return 0; - return pfn >= node_start_pfn(nid) && (pfn) < node_end_pfn(nid); -} -EXPORT_SYMBOL(pfn_valid); -#endif |