| /* |
| * 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]; |
| bootmem_data_t plat_node_bdata[MAX_NUMNODES]; |
| |
| int memnode_shift; |
| u8 memnodemap[NODEMAPSIZE]; |
| |
| unsigned char cpu_to_node[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE }; |
| cpumask_t node_to_cpumask[MAX_NUMNODES]; |
| |
| int numa_off __initdata; |
| |
| int __init compute_hash_shift(struct node *nodes, int numnodes) |
| { |
| int i; |
| int shift = 24; |
| u64 addr; |
| |
| /* When in doubt use brute force. */ |
| while (shift < 48) { |
| memset(memnodemap,0xff,sizeof(*memnodemap) * NODEMAPSIZE); |
| for (i = 0; i < numnodes; i++) { |
| if (nodes[i].start == nodes[i].end) |
| continue; |
| for (addr = nodes[i].start; |
| addr < nodes[i].end; |
| addr += (1UL << shift)) { |
| if (memnodemap[addr >> shift] != 0xff && |
| memnodemap[addr >> shift] != i) { |
| printk(KERN_INFO |
| "node %d shift %d addr %Lx conflict %d\n", |
| i, shift, addr, memnodemap[addr>>shift]); |
| goto next; |
| } |
| memnodemap[addr >> shift] = i; |
| } |
| } |
| return shift; |
| next: |
| shift++; |
| } |
| memset(memnodemap,0,sizeof(*memnodemap) * NODEMAPSIZE); |
| return -1; |
| } |
| |
| #ifdef CONFIG_SPARSEMEM |
| int early_pfn_to_nid(unsigned long pfn) |
| { |
| return phys_to_nid(pfn << PAGE_SHIFT); |
| } |
| #endif |
| |
| /* 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; |
| const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE); |
| |
| start = round_up(start, ZONE_ALIGN); |
| |
| printk("Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end); |
| |
| start_pfn = start >> PAGE_SHIFT; |
| end_pfn = end >> PAGE_SHIFT; |
| |
| memory_present(nodeid, start_pfn, end_pfn); |
| nodedata_phys = find_e820_area(start, end, pgdat_size); |
| if (nodedata_phys == -1L) |
| panic("Cannot find memory pgdat in node %d\n", nodeid); |
| |
| Dprintk("nodedata_phys %lx\n", nodedata_phys); |
| |
| node_data[nodeid] = phys_to_virt(nodedata_phys); |
| 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_start = find_e820_area(bootmap_start, end, bootmap_pages<<PAGE_SHIFT); |
| if (bootmap_start == -1L) |
| panic("Not enough continuous space for bootmap on node %d", nodeid); |
| 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); |
| |
| e820_bootmem_free(NODE_DATA(nodeid), start, end); |
| |
| reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); |
| reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT); |
| node_set_online(nodeid); |
| } |
| |
| /* Initialize final allocator for a zone */ |
| void __init setup_node_zones(int nodeid) |
| { |
| unsigned long start_pfn, end_pfn; |
| unsigned long zones[MAX_NR_ZONES]; |
| unsigned long dma_end_pfn; |
| |
| memset(zones, 0, sizeof(unsigned long) * MAX_NR_ZONES); |
| |
| start_pfn = node_start_pfn(nodeid); |
| end_pfn = node_end_pfn(nodeid); |
| |
| Dprintk(KERN_INFO "setting up node %d %lx-%lx\n", nodeid, start_pfn, end_pfn); |
| |
| /* All nodes > 0 have a zero length zone DMA */ |
| dma_end_pfn = __pa(MAX_DMA_ADDRESS) >> PAGE_SHIFT; |
| if (start_pfn < dma_end_pfn) { |
| zones[ZONE_DMA] = dma_end_pfn - start_pfn; |
| zones[ZONE_NORMAL] = end_pfn - dma_end_pfn; |
| } else { |
| zones[ZONE_NORMAL] = end_pfn - start_pfn; |
| } |
| |
| free_area_init_node(nodeid, NODE_DATA(nodeid), zones, |
| start_pfn, NULL); |
| } |
| |
| 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 = 0; |
| for (i = 0; i < NR_CPUS; i++) { |
| if (cpu_to_node[i] != NUMA_NO_NODE) |
| continue; |
| rr = next_node(rr, node_online_map); |
| if (rr == MAX_NUMNODES) |
| rr = first_node(node_online_map); |
| cpu_to_node[i] = rr; |
| rr++; |
| } |
| |
| set_bit(0, &node_to_cpumask[cpu_to_node(0)]); |
| } |
| |
| #ifdef CONFIG_NUMA_EMU |
| int numa_fake __initdata = 0; |
| |
| /* Numa emulation */ |
| static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn) |
| { |
| int i; |
| struct node nodes[MAX_NUMNODES]; |
| unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake; |
| |
| /* Kludge needed for the hash function */ |
| if (hweight64(sz) > 1) { |
| unsigned long x = 1; |
| while ((x << 1) < sz) |
| x <<= 1; |
| if (x < sz/2) |
| printk("Numa emulation unbalanced. Complain to maintainer\n"); |
| sz = x; |
| } |
| |
| memset(&nodes,0,sizeof(nodes)); |
| for (i = 0; i < numa_fake; i++) { |
| nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz; |
| if (i == numa_fake-1) |
| sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start; |
| nodes[i].end = nodes[i].start + sz; |
| if (i != numa_fake-1) |
| nodes[i].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) |
| 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[0] = 0; |
| nodes_clear(node_online_map); |
| node_set_online(0); |
| for (i = 0; i < NR_CPUS; i++) |
| cpu_to_node[i] = 0; |
| node_to_cpumask[0] = cpumask_of_cpu(0); |
| setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT); |
| } |
| |
| __cpuinit void numa_add_cpu(int cpu) |
| { |
| /* BP is initialized elsewhere */ |
| if (cpu) |
| set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]); |
| } |
| |
| 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; |
| for_each_online_node(i) { |
| setup_node_zones(i); |
| } |
| } |
| |
| /* [numa=off] */ |
| __init int numa_setup(char *opt) |
| { |
| 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; |
| #endif |
| return 1; |
| } |
| |
| EXPORT_SYMBOL(cpu_to_node); |
| EXPORT_SYMBOL(node_to_cpumask); |
| EXPORT_SYMBOL(memnode_shift); |
| EXPORT_SYMBOL(memnodemap); |
| EXPORT_SYMBOL(node_data); |