1 /*
2 * linux/arch/alpha/mm/numa.c
3 *
4 * DISCONTIGMEM NUMA alpha support.
5 *
6 * Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
7 */
8
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/mm.h>
12 #include <linux/bootmem.h>
13 #include <linux/swap.h>
14 #include <linux/initrd.h>
15 #include <linux/pfn.h>
16 #include <linux/module.h>
17
18 #include <asm/hwrpb.h>
19 #include <asm/pgalloc.h>
20 #include <asm/sections.h>
21
22 pg_data_t node_data[MAX_NUMNODES];
23 EXPORT_SYMBOL(node_data);
24
25 #undef DEBUG_DISCONTIG
26 #ifdef DEBUG_DISCONTIG
27 #define DBGDCONT(args...) printk(args)
28 #else
29 #define DBGDCONT(args...)
30 #endif
31
32 #define for_each_mem_cluster(memdesc, _cluster, i) \
33 for ((_cluster) = (memdesc)->cluster, (i) = 0; \
34 (i) < (memdesc)->numclusters; (i)++, (_cluster)++)
35
show_mem_layout(void)36 static void __init show_mem_layout(void)
37 {
38 struct memclust_struct * cluster;
39 struct memdesc_struct * memdesc;
40 int i;
41
42 /* Find free clusters, and init and free the bootmem accordingly. */
43 memdesc = (struct memdesc_struct *)
44 (hwrpb->mddt_offset + (unsigned long) hwrpb);
45
46 printk("Raw memory layout:\n");
47 for_each_mem_cluster(memdesc, cluster, i) {
48 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
49 i, cluster->usage, cluster->start_pfn,
50 cluster->start_pfn + cluster->numpages);
51 }
52 }
53
54 static void __init
setup_memory_node(int nid,void * kernel_end)55 setup_memory_node(int nid, void *kernel_end)
56 {
57 extern unsigned long mem_size_limit;
58 struct memclust_struct * cluster;
59 struct memdesc_struct * memdesc;
60 unsigned long start_kernel_pfn, end_kernel_pfn;
61 unsigned long bootmap_size, bootmap_pages, bootmap_start;
62 unsigned long start, end;
63 unsigned long node_pfn_start, node_pfn_end;
64 unsigned long node_min_pfn, node_max_pfn;
65 int i;
66 unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
67 int show_init = 0;
68
69 /* Find the bounds of current node */
70 node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
71 node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
72
73 /* Find free clusters, and init and free the bootmem accordingly. */
74 memdesc = (struct memdesc_struct *)
75 (hwrpb->mddt_offset + (unsigned long) hwrpb);
76
77 /* find the bounds of this node (node_min_pfn/node_max_pfn) */
78 node_min_pfn = ~0UL;
79 node_max_pfn = 0UL;
80 for_each_mem_cluster(memdesc, cluster, i) {
81 /* Bit 0 is console/PALcode reserved. Bit 1 is
82 non-volatile memory -- we might want to mark
83 this for later. */
84 if (cluster->usage & 3)
85 continue;
86
87 start = cluster->start_pfn;
88 end = start + cluster->numpages;
89
90 if (start >= node_pfn_end || end <= node_pfn_start)
91 continue;
92
93 if (!show_init) {
94 show_init = 1;
95 printk("Initializing bootmem allocator on Node ID %d\n", nid);
96 }
97 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
98 i, cluster->usage, cluster->start_pfn,
99 cluster->start_pfn + cluster->numpages);
100
101 if (start < node_pfn_start)
102 start = node_pfn_start;
103 if (end > node_pfn_end)
104 end = node_pfn_end;
105
106 if (start < node_min_pfn)
107 node_min_pfn = start;
108 if (end > node_max_pfn)
109 node_max_pfn = end;
110 }
111
112 if (mem_size_limit && node_max_pfn > mem_size_limit) {
113 static int msg_shown = 0;
114 if (!msg_shown) {
115 msg_shown = 1;
116 printk("setup: forcing memory size to %ldK (from %ldK).\n",
117 mem_size_limit << (PAGE_SHIFT - 10),
118 node_max_pfn << (PAGE_SHIFT - 10));
119 }
120 node_max_pfn = mem_size_limit;
121 }
122
123 if (node_min_pfn >= node_max_pfn)
124 return;
125
126 /* Update global {min,max}_low_pfn from node information. */
127 if (node_min_pfn < min_low_pfn)
128 min_low_pfn = node_min_pfn;
129 if (node_max_pfn > max_low_pfn)
130 max_pfn = max_low_pfn = node_max_pfn;
131
132 #if 0 /* we'll try this one again in a little while */
133 /* Cute trick to make sure our local node data is on local memory */
134 node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
135 #endif
136 /* Quasi-mark the pg_data_t as in-use */
137 node_min_pfn += node_datasz;
138 if (node_min_pfn >= node_max_pfn) {
139 printk(" not enough mem to reserve NODE_DATA");
140 return;
141 }
142 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
143
144 printk(" Detected node memory: start %8lu, end %8lu\n",
145 node_min_pfn, node_max_pfn);
146
147 DBGDCONT(" DISCONTIG: node_data[%d] is at 0x%p\n", nid, NODE_DATA(nid));
148 DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
149
150 /* Find the bounds of kernel memory. */
151 start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
152 end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
153 bootmap_start = -1;
154
155 if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
156 panic("kernel loaded out of ram");
157
158 /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
159 Note that we round this down, not up - node memory
160 has much larger alignment than 8Mb, so it's safe. */
161 node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
162
163 /* We need to know how many physically contiguous pages
164 we'll need for the bootmap. */
165 bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
166
167 /* Now find a good region where to allocate the bootmap. */
168 for_each_mem_cluster(memdesc, cluster, i) {
169 if (cluster->usage & 3)
170 continue;
171
172 start = cluster->start_pfn;
173 end = start + cluster->numpages;
174
175 if (start >= node_max_pfn || end <= node_min_pfn)
176 continue;
177
178 if (end > node_max_pfn)
179 end = node_max_pfn;
180 if (start < node_min_pfn)
181 start = node_min_pfn;
182
183 if (start < start_kernel_pfn) {
184 if (end > end_kernel_pfn
185 && end - end_kernel_pfn >= bootmap_pages) {
186 bootmap_start = end_kernel_pfn;
187 break;
188 } else if (end > start_kernel_pfn)
189 end = start_kernel_pfn;
190 } else if (start < end_kernel_pfn)
191 start = end_kernel_pfn;
192 if (end - start >= bootmap_pages) {
193 bootmap_start = start;
194 break;
195 }
196 }
197
198 if (bootmap_start == -1)
199 panic("couldn't find a contiguous place for the bootmap");
200
201 /* Allocate the bootmap and mark the whole MM as reserved. */
202 bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
203 node_min_pfn, node_max_pfn);
204 DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
205 bootmap_start, bootmap_size, bootmap_pages);
206
207 /* Mark the free regions. */
208 for_each_mem_cluster(memdesc, cluster, i) {
209 if (cluster->usage & 3)
210 continue;
211
212 start = cluster->start_pfn;
213 end = cluster->start_pfn + cluster->numpages;
214
215 if (start >= node_max_pfn || end <= node_min_pfn)
216 continue;
217
218 if (end > node_max_pfn)
219 end = node_max_pfn;
220 if (start < node_min_pfn)
221 start = node_min_pfn;
222
223 if (start < start_kernel_pfn) {
224 if (end > end_kernel_pfn) {
225 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
226 (PFN_PHYS(start_kernel_pfn)
227 - PFN_PHYS(start)));
228 printk(" freeing pages %ld:%ld\n",
229 start, start_kernel_pfn);
230 start = end_kernel_pfn;
231 } else if (end > start_kernel_pfn)
232 end = start_kernel_pfn;
233 } else if (start < end_kernel_pfn)
234 start = end_kernel_pfn;
235 if (start >= end)
236 continue;
237
238 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
239 printk(" freeing pages %ld:%ld\n", start, end);
240 }
241
242 /* Reserve the bootmap memory. */
243 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
244 bootmap_size, BOOTMEM_DEFAULT);
245 printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
246
247 node_set_online(nid);
248 }
249
250 void __init
setup_memory(void * kernel_end)251 setup_memory(void *kernel_end)
252 {
253 int nid;
254
255 show_mem_layout();
256
257 nodes_clear(node_online_map);
258
259 min_low_pfn = ~0UL;
260 max_low_pfn = 0UL;
261 for (nid = 0; nid < MAX_NUMNODES; nid++)
262 setup_memory_node(nid, kernel_end);
263
264 #ifdef CONFIG_BLK_DEV_INITRD
265 initrd_start = INITRD_START;
266 if (initrd_start) {
267 extern void *move_initrd(unsigned long);
268
269 initrd_end = initrd_start+INITRD_SIZE;
270 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
271 (void *) initrd_start, INITRD_SIZE);
272
273 if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
274 if (!move_initrd(PFN_PHYS(max_low_pfn)))
275 printk("initrd extends beyond end of memory "
276 "(0x%08lx > 0x%p)\ndisabling initrd\n",
277 initrd_end,
278 phys_to_virt(PFN_PHYS(max_low_pfn)));
279 } else {
280 nid = kvaddr_to_nid(initrd_start);
281 reserve_bootmem_node(NODE_DATA(nid),
282 virt_to_phys((void *)initrd_start),
283 INITRD_SIZE, BOOTMEM_DEFAULT);
284 }
285 }
286 #endif /* CONFIG_BLK_DEV_INITRD */
287 }
288
paging_init(void)289 void __init paging_init(void)
290 {
291 unsigned int nid;
292 unsigned long zones_size[MAX_NR_ZONES] = {0, };
293 unsigned long dma_local_pfn;
294
295 /*
296 * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
297 * in the NUMA model, for now we convert it to a pfn and
298 * we interpret this pfn as a local per-node information.
299 * This issue isn't very important since none of these machines
300 * have legacy ISA slots anyways.
301 */
302 dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
303
304 for_each_online_node(nid) {
305 bootmem_data_t *bdata = &bootmem_node_data[nid];
306 unsigned long start_pfn = bdata->node_min_pfn;
307 unsigned long end_pfn = bdata->node_low_pfn;
308
309 if (dma_local_pfn >= end_pfn - start_pfn)
310 zones_size[ZONE_DMA] = end_pfn - start_pfn;
311 else {
312 zones_size[ZONE_DMA] = dma_local_pfn;
313 zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
314 }
315 node_set_state(nid, N_NORMAL_MEMORY);
316 free_area_init_node(nid, zones_size, start_pfn, NULL);
317 }
318
319 /* Initialize the kernel's ZERO_PGE. */
320 memset((void *)ZERO_PGE, 0, PAGE_SIZE);
321 }
322