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>
36 * proximity macros and definitions
38 #define NODE_ARRAY_INDEX(x) ((x) / 8) /* 8 bits/char */
39 #define NODE_ARRAY_OFFSET(x) ((x) % 8) /* 8 bits/char */
40 #define BMAP_SET(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] |= 1 << NODE_ARRAY_OFFSET(bit))
41 #define BMAP_TEST(bmap, bit) ((bmap)[NODE_ARRAY_INDEX(bit)] & (1 << NODE_ARRAY_OFFSET(bit)))
42 /* bitmap length; _PXM is at most 255 */
43 #define PXM_BITMAP_LEN (MAX_PXM_DOMAINS / 8)
44 static u8 pxm_bitmap[PXM_BITMAP_LEN]; /* bitmap of proximity domains */
46 #define MAX_CHUNKS_PER_NODE 3
47 #define MAXCHUNKS (MAX_CHUNKS_PER_NODE * MAX_NUMNODES)
48 struct node_memory_chunk_s {
49 unsigned long start_pfn;
50 unsigned long end_pfn;
51 u8 pxm; // proximity domain of node
52 u8 nid; // which cnode contains this chunk?
53 u8 bank; // which mem bank on this node
55 static struct node_memory_chunk_s node_memory_chunk[MAXCHUNKS];
57 static int num_memory_chunks; /* total number of memory chunks */
58 static u8 __initdata apicid_to_pxm[MAX_APICID];
60 extern void * boot_ioremap(unsigned long, unsigned long);
62 /* Identify CPU proximity domains */
63 static void __init parse_cpu_affinity_structure(char *p)
65 struct acpi_srat_cpu_affinity *cpu_affinity =
66 (struct acpi_srat_cpu_affinity *) p;
68 if ((cpu_affinity->flags & ACPI_SRAT_CPU_ENABLED) == 0)
69 return; /* empty entry */
71 /* mark this node as "seen" in node bitmap */
72 BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo);
74 apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo;
76 printk("CPU 0x%02X in proximity domain 0x%02X\n",
77 cpu_affinity->apic_id, cpu_affinity->proximity_domain_lo);
81 * Identify memory proximity domains and hot-remove capabilities.
82 * Fill node memory chunk list structure.
84 static void __init parse_memory_affinity_structure (char *sratp)
86 unsigned long long paddr, size;
87 unsigned long start_pfn, end_pfn;
89 struct node_memory_chunk_s *p, *q, *pend;
90 struct acpi_srat_mem_affinity *memory_affinity =
91 (struct acpi_srat_mem_affinity *) sratp;
93 if ((memory_affinity->flags & ACPI_SRAT_MEM_ENABLED) == 0)
94 return; /* empty entry */
96 pxm = memory_affinity->proximity_domain & 0xff;
98 /* mark this node as "seen" in node bitmap */
99 BMAP_SET(pxm_bitmap, pxm);
101 /* calculate info for memory chunk structure */
102 paddr = memory_affinity->base_address;
103 size = memory_affinity->length;
105 start_pfn = paddr >> PAGE_SHIFT;
106 end_pfn = (paddr + size) >> PAGE_SHIFT;
109 if (num_memory_chunks >= MAXCHUNKS) {
110 printk("Too many mem chunks in SRAT. Ignoring %lld MBytes at %llx\n",
111 size/(1024*1024), paddr);
115 /* Insertion sort based on base address */
116 pend = &node_memory_chunk[num_memory_chunks];
117 for (p = &node_memory_chunk[0]; p < pend; p++) {
118 if (start_pfn < p->start_pfn)
122 for (q = pend; q >= p; q--)
125 p->start_pfn = start_pfn;
126 p->end_pfn = end_pfn;
131 printk("Memory range 0x%lX to 0x%lX (type 0x%X) in proximity domain 0x%02X %s\n",
133 memory_affinity->memory_type,
135 ((memory_affinity->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
136 "enabled and removable" : "enabled" ) );
140 * The SRAT table always lists ascending addresses, so can always
141 * assume that the first "start" address that you see is the real
142 * start of the node, and that the current "end" address is after
145 static __init void node_read_chunk(int nid, struct node_memory_chunk_s *memory_chunk)
148 * Only add present memory as told by the e820.
149 * There is no guarantee from the SRAT that the memory it
150 * enumerates is present at boot time because it represents
151 * *possible* memory hotplug areas the same as normal RAM.
153 if (memory_chunk->start_pfn >= max_pfn) {
154 printk (KERN_INFO "Ignoring SRAT pfns: 0x%08lx -> %08lx\n",
155 memory_chunk->start_pfn, memory_chunk->end_pfn);
158 if (memory_chunk->nid != nid)
161 if (!node_has_online_mem(nid))
162 node_start_pfn[nid] = memory_chunk->start_pfn;
164 if (node_start_pfn[nid] > memory_chunk->start_pfn)
165 node_start_pfn[nid] = memory_chunk->start_pfn;
167 if (node_end_pfn[nid] < memory_chunk->end_pfn)
168 node_end_pfn[nid] = memory_chunk->end_pfn;
171 /* Parse the ACPI Static Resource Affinity Table */
172 static int __init acpi20_parse_srat(struct acpi_table_srat *sratp)
177 start = (u8 *)(&(sratp->reserved) + 1); /* skip header */
179 end = (u8 *)sratp + sratp->header.length;
181 memset(pxm_bitmap, 0, sizeof(pxm_bitmap)); /* init proximity domain bitmap */
182 memset(node_memory_chunk, 0, sizeof(node_memory_chunk));
184 num_memory_chunks = 0;
187 case ACPI_SRAT_TYPE_CPU_AFFINITY:
188 parse_cpu_affinity_structure(p);
190 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
191 parse_memory_affinity_structure(p);
194 printk("ACPI 2.0 SRAT: unknown entry skipped: type=0x%02X, len=%d\n", p[0], p[1]);
199 printk("acpi20_parse_srat: Entry length value is zero;"
200 " can't parse any further!\n");
205 if (num_memory_chunks == 0) {
206 printk("could not finy any ACPI SRAT memory areas.\n");
210 /* Calculate total number of nodes in system from PXM bitmap and create
211 * a set of sequential node IDs starting at zero. (ACPI doesn't seem
212 * to specify the range of _PXM values.)
215 * MCD - we no longer HAVE to number nodes sequentially. PXM domain
216 * numbers could go as high as 256, and MAX_NUMNODES for i386 is typically
217 * 32, so we will continue numbering them in this manner until MAX_NUMNODES
218 * approaches MAX_PXM_DOMAINS for i386.
220 nodes_clear(node_online_map);
221 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
222 if (BMAP_TEST(pxm_bitmap, i)) {
223 int nid = acpi_map_pxm_to_node(i);
224 node_set_online(nid);
227 BUG_ON(num_online_nodes() == 0);
229 /* set cnode id in memory chunk structure */
230 for (i = 0; i < num_memory_chunks; i++)
231 node_memory_chunk[i].nid = pxm_to_node(node_memory_chunk[i].pxm);
233 printk("pxm bitmap: ");
234 for (i = 0; i < sizeof(pxm_bitmap); i++) {
235 printk("%02X ", pxm_bitmap[i]);
238 printk("Number of logical nodes in system = %d\n", num_online_nodes());
239 printk("Number of memory chunks in system = %d\n", num_memory_chunks);
241 for (i = 0; i < MAX_APICID; i++)
242 apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]);
244 for (j = 0; j < num_memory_chunks; j++){
245 struct node_memory_chunk_s * chunk = &node_memory_chunk[j];
246 printk("chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
247 j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
248 node_read_chunk(chunk->nid, chunk);
249 add_active_range(chunk->nid, chunk->start_pfn, chunk->end_pfn);
252 for_each_online_node(nid) {
253 unsigned long start = node_start_pfn[nid];
254 unsigned long end = node_end_pfn[nid];
256 memory_present(nid, start, end);
257 node_remap_size[nid] = node_memmap_size_bytes(nid, start, end);
264 struct acpi_static_rsdt {
265 struct acpi_table_rsdt table;
266 u32 padding[7]; /* Allow for 7 more table entries */
269 int __init get_memcfg_from_srat(void)
271 struct acpi_table_header *header = NULL;
272 struct acpi_table_rsdp *rsdp = NULL;
273 struct acpi_table_rsdt *rsdt = NULL;
274 acpi_native_uint rsdp_address = 0;
275 struct acpi_static_rsdt saved_rsdt;
279 rsdp_address = acpi_find_rsdp();
281 printk("%s: System description tables not found\n",
286 printk("%s: assigning address to rsdp\n", __FUNCTION__);
287 rsdp = (struct acpi_table_rsdp *)(u32)rsdp_address;
289 printk("%s: Didn't find ACPI root!\n", __FUNCTION__);
293 printk(KERN_INFO "%.8s v%d [%.6s]\n", rsdp->signature, rsdp->revision,
296 if (strncmp(rsdp->signature, ACPI_SIG_RSDP,strlen(ACPI_SIG_RSDP))) {
297 printk(KERN_WARNING "%s: RSDP table signature incorrect\n", __FUNCTION__);
301 rsdt = (struct acpi_table_rsdt *)
302 boot_ioremap(rsdp->rsdt_physical_address, sizeof(struct acpi_table_rsdt));
306 "%s: ACPI: Invalid root system description tables (RSDT)\n",
311 header = &rsdt->header;
313 if (strncmp(header->signature, ACPI_SIG_RSDT, strlen(ACPI_SIG_RSDT))) {
314 printk(KERN_WARNING "ACPI: RSDT signature incorrect\n");
319 * The number of tables is computed by taking the
320 * size of all entries (header size minus total
321 * size of RSDT) divided by the size of each entry
322 * (4-byte table pointers).
324 tables = (header->length - sizeof(struct acpi_table_header)) / 4;
329 memcpy(&saved_rsdt, rsdt, sizeof(saved_rsdt));
331 if (saved_rsdt.table.header.length > sizeof(saved_rsdt)) {
332 printk(KERN_WARNING "ACPI: Too big length in RSDT: %d\n",
333 saved_rsdt.table.header.length);
337 printk("Begin SRAT table scan....\n");
339 for (i = 0; i < tables; i++) {
340 /* Map in header, then map in full table length. */
341 header = (struct acpi_table_header *)
342 boot_ioremap(saved_rsdt.table.table_offset_entry[i], sizeof(struct acpi_table_header));
345 header = (struct acpi_table_header *)
346 boot_ioremap(saved_rsdt.table.table_offset_entry[i], header->length);
350 if (strncmp((char *) &header->signature, ACPI_SIG_SRAT, 4))
353 /* we've found the srat table. don't need to look at any more tables */
354 return acpi20_parse_srat((struct acpi_table_srat *)header);
357 remove_all_active_ranges();
358 printk("failed to get NUMA memory information from SRAT table\n");