2 * Some of the code in this file has been gleaned from the 64 bit
3 * discontigmem support code base.
5 * Copyright (C) 2002, IBM Corp.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
17 * NON INFRINGEMENT. See the GNU General Public License for more
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * Send feedback to Pat Gaughen <gone@us.ibm.com>
27 #include <linux/bootmem.h>
28 #include <linux/mmzone.h>
29 #include <linux/acpi.h>
30 #include <linux/nodemask.h>
32 #include <asm/topology.h>
37 * proximity macros and definitions
39 #define NODE_ARRAY_INDEX(x) ((x) / 8) /* 8 bits/char */
40 #define NODE_ARRAY_OFFSET(x) ((x) % 8) /* 8 bits/char */
41 #define BMAP_SET(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
42 #define BMAP_TEST(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
43 /* bitmap length; _PXM is at most 255 */
44 #define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
45 static u8 __initdata pxm_bitmap[PXM_BITMAP_LEN]; /* bitmap of proximity domains */
47 #define MAX_CHUNKS_PER_NODE 3
48 #define MAXCHUNKS (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
49 struct node_memory_chunk_s {
50 unsigned long start_pfn;
51 unsigned long end_pfn;
52 u8 pxm; // proximity domain of node
53 u8 nid; // which cnode contains this chunk?
54 u8 bank; // which mem bank on this node
56 static struct node_memory_chunk_s __initdata node_memory_chunk[MAXCHUNKS];
58 static int __initdata num_memory_chunks; /* total number of memory chunks */
59 static u8 __initdata apicid_to_pxm[MAX_APICID];
61 int numa_off __initdata;
62 int acpi_numa __initdata;
64 static __init void bad_srat(void)
66 printk(KERN_ERR "SRAT: SRAT not used.\n");
68 num_memory_chunks = 0;
71 static __init inline int srat_disabled(void)
73 return numa_off || acpi_numa < 0;
76 /* Identify CPU proximity domains */
78 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity)
82 if (cpu_affinity->header.length !=
83 sizeof(struct acpi_srat_cpu_affinity)) {
88 if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
89 return; /* empty entry */
91 /* mark this node as "seen" in node bitmap */
92 BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);
94 apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
96 printk("CPU 0x%02X in proximity domain 0x%02X\n",
97 cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
101 * Identify memory proximity domains and hot-remove capabilities.
102 * Fill node memory chunk list structure.
105 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *memory_affinity)
107 unsigned long long paddr, size;
108 unsigned long start_pfn, end_pfn;
110 struct node_memory_chunk_s *p, *q, *pend;
114 if (memory_affinity->header.length !=
115 sizeof(struct acpi_srat_mem_affinity)) {
120 if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
121 return; /* empty entry */
123 pxm = memory_affinity->proximity_domain & 0xff;
125 /* mark this node as "seen" in node bitmap */
126 BMAP_SET(pxm_bitmap, pxm);
128 /* calculate info for memory chunk structure */
129 paddr = memory_affinity->base_address;
130 size = memory_affinity->length;
132 start_pfn = paddr >> PAGE_SHIFT;
133 end_pfn = (paddr + size) >> PAGE_SHIFT;
136 if (num_memory_chunks >= MAXCHUNKS) {
137 printk("Too many mem chunks in SRAT. Ignoring %lld MBytes at %llx\n",
138 size/(1024*1024), paddr);
142 /* Insertion sort based on base address */
143 pend = &node_memory_chunk[num_memory_chunks];
144 for (p = &node_memory_chunk[0]; p < pend; p++) {
145 if (start_pfn < p->start_pfn)
149 for (q = pend; q >= p; q--)
152 p->start_pfn = start_pfn;
153 p->end_pfn = end_pfn;
158 printk("Memory range 0x%lX to 0x%lX (type 0x%X) in proximity domain 0x%02X %s\n",
160 memory_affinity->memory_type,
162 ((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
163 "enabled and removable" : "enabled" ) );
166 /* Callback for SLIT parsing */
167 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
171 void acpi_numa_arch_fixup(void)
175 * The SRAT table always lists ascending addresses, so can always
176 * assume that the first "start" address that you see is the real
177 * start of the node, and that the current "end" address is after
180 static __init void node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
183 * Only add present memory as told by the e820.
184 * There is no guarantee from the SRAT that the memory it
185 * enumerates is present at boot time because it represents
186 * *possible* memory hotplug areas the same as normal RAM.
188 if (memory_chunk->start_pfn >= max_pfn) {
189 printk (KERN_INFO "Ignoring SRAT pfns: 0x%08lx -> %08lx\n",
190 memory_chunk->start_pfn, memory_chunk->end_pfn);
193 if (memory_chunk->nid != nid)
196 if (!node_has_online_mem(nid))
197 node_start_pfn[nid] = memory_chunk->start_pfn;
199 if (node_start_pfn[nid] > memory_chunk->start_pfn)
200 node_start_pfn[nid] = memory_chunk->start_pfn;
202 if (node_end_pfn[nid] < memory_chunk->end_pfn)
203 node_end_pfn[nid] = memory_chunk->end_pfn;
206 int __init get_memcfg_from_srat(void)
214 if (num_memory_chunks == 0) {
215 printk("could not finy any ACPI SRAT memory areas.\n");
219 /* Calculate total number of nodes in system from PXM bitmap and create
220 * a set of sequential node IDs starting at zero. (ACPI doesn't seem
221 * to specify the range of _PXM values.)
224 * MCD - we no longer HAVE to number nodes sequentially. PXM domain
225 * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
226 * 32, so we will continue numbering them in this manner until MAX_NUMNODES
227 * approaches MAX_PXM_DOMAINS for i386.
229 nodes_clear(node_online_map);
230 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
231 if (BMAP_TEST(pxm_bitmap, i)) {
232 int nid = acpi_map_pxm_to_node(i);
233 node_set_online(nid);
236 BUG_ON(num_online_nodes() == 0);
238 /* set cnode id in memory chunk structure */
239 for (i = 0; i < num_memory_chunks; i++)
240 node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
242 printk("pxm bitmap: ");
243 for (i = 0; i < sizeof(pxm_bitmap); i++) {
244 printk("%02X ", pxm_bitmap[i]);
247 printk("Number of logical nodes in system = %d\n", num_online_nodes());
248 printk("Number of memory chunks in system = %d\n", num_memory_chunks);
250 for (i = 0; i < MAX_APICID; i++)
251 apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
253 for (j = 0; j < num_memory_chunks; j++){
254 struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
255 printk("chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
256 j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
257 node_read_chunk(chunk->nid, chunk);
258 e820_register_active_regions(chunk->nid, chunk->start_pfn,
259 min(chunk->end_pfn, max_pfn));
262 for_each_online_node(nid) {
263 unsigned long start = node_start_pfn[nid];
264 unsigned long end = min(node_end_pfn[nid], max_pfn);
266 memory_present(nid, start, end);
267 node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
271 printk("failed to get NUMA memory information from SRAT table\n");