License cleanup: add SPDX GPL-2.0 license identifier to files with no license
[sfrench/cifs-2.6.git] / arch / alpha / mm / numa.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  linux/arch/alpha/mm/numa.c
4  *
5  *  DISCONTIGMEM NUMA alpha support.
6  *
7  *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
8  */
9
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/mm.h>
13 #include <linux/bootmem.h>
14 #include <linux/swap.h>
15 #include <linux/initrd.h>
16 #include <linux/pfn.h>
17 #include <linux/module.h>
18
19 #include <asm/hwrpb.h>
20 #include <asm/pgalloc.h>
21 #include <asm/sections.h>
22
23 pg_data_t node_data[MAX_NUMNODES];
24 EXPORT_SYMBOL(node_data);
25
26 #undef DEBUG_DISCONTIG
27 #ifdef DEBUG_DISCONTIG
28 #define DBGDCONT(args...) printk(args)
29 #else
30 #define DBGDCONT(args...)
31 #endif
32
33 #define for_each_mem_cluster(memdesc, _cluster, i)              \
34         for ((_cluster) = (memdesc)->cluster, (i) = 0;          \
35              (i) < (memdesc)->numclusters; (i)++, (_cluster)++)
36
37 static void __init show_mem_layout(void)
38 {
39         struct memclust_struct * cluster;
40         struct memdesc_struct * memdesc;
41         int i;
42
43         /* Find free clusters, and init and free the bootmem accordingly.  */
44         memdesc = (struct memdesc_struct *)
45           (hwrpb->mddt_offset + (unsigned long) hwrpb);
46
47         printk("Raw memory layout:\n");
48         for_each_mem_cluster(memdesc, cluster, i) {
49                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
50                        i, cluster->usage, cluster->start_pfn,
51                        cluster->start_pfn + cluster->numpages);
52         }
53 }
54
55 static void __init
56 setup_memory_node(int nid, void *kernel_end)
57 {
58         extern unsigned long mem_size_limit;
59         struct memclust_struct * cluster;
60         struct memdesc_struct * memdesc;
61         unsigned long start_kernel_pfn, end_kernel_pfn;
62         unsigned long bootmap_size, bootmap_pages, bootmap_start;
63         unsigned long start, end;
64         unsigned long node_pfn_start, node_pfn_end;
65         unsigned long node_min_pfn, node_max_pfn;
66         int i;
67         unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
68         int show_init = 0;
69
70         /* Find the bounds of current node */
71         node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
72         node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
73         
74         /* Find free clusters, and init and free the bootmem accordingly.  */
75         memdesc = (struct memdesc_struct *)
76           (hwrpb->mddt_offset + (unsigned long) hwrpb);
77
78         /* find the bounds of this node (node_min_pfn/node_max_pfn) */
79         node_min_pfn = ~0UL;
80         node_max_pfn = 0UL;
81         for_each_mem_cluster(memdesc, cluster, i) {
82                 /* Bit 0 is console/PALcode reserved.  Bit 1 is
83                    non-volatile memory -- we might want to mark
84                    this for later.  */
85                 if (cluster->usage & 3)
86                         continue;
87
88                 start = cluster->start_pfn;
89                 end = start + cluster->numpages;
90
91                 if (start >= node_pfn_end || end <= node_pfn_start)
92                         continue;
93
94                 if (!show_init) {
95                         show_init = 1;
96                         printk("Initializing bootmem allocator on Node ID %d\n", nid);
97                 }
98                 printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
99                        i, cluster->usage, cluster->start_pfn,
100                        cluster->start_pfn + cluster->numpages);
101
102                 if (start < node_pfn_start)
103                         start = node_pfn_start;
104                 if (end > node_pfn_end)
105                         end = node_pfn_end;
106
107                 if (start < node_min_pfn)
108                         node_min_pfn = start;
109                 if (end > node_max_pfn)
110                         node_max_pfn = end;
111         }
112
113         if (mem_size_limit && node_max_pfn > mem_size_limit) {
114                 static int msg_shown = 0;
115                 if (!msg_shown) {
116                         msg_shown = 1;
117                         printk("setup: forcing memory size to %ldK (from %ldK).\n",
118                                mem_size_limit << (PAGE_SHIFT - 10),
119                                node_max_pfn    << (PAGE_SHIFT - 10));
120                 }
121                 node_max_pfn = mem_size_limit;
122         }
123
124         if (node_min_pfn >= node_max_pfn)
125                 return;
126
127         /* Update global {min,max}_low_pfn from node information. */
128         if (node_min_pfn < min_low_pfn)
129                 min_low_pfn = node_min_pfn;
130         if (node_max_pfn > max_low_pfn)
131                 max_pfn = max_low_pfn = node_max_pfn;
132
133 #if 0 /* we'll try this one again in a little while */
134         /* Cute trick to make sure our local node data is on local memory */
135         node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
136 #endif
137         /* Quasi-mark the pg_data_t as in-use */
138         node_min_pfn += node_datasz;
139         if (node_min_pfn >= node_max_pfn) {
140                 printk(" not enough mem to reserve NODE_DATA");
141                 return;
142         }
143         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
144
145         printk(" Detected node memory:   start %8lu, end %8lu\n",
146                node_min_pfn, node_max_pfn);
147
148         DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
149         DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
150
151         /* Find the bounds of kernel memory.  */
152         start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
153         end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
154         bootmap_start = -1;
155
156         if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
157                 panic("kernel loaded out of ram");
158
159         /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
160            Note that we round this down, not up - node memory
161            has much larger alignment than 8Mb, so it's safe. */
162         node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
163
164         /* We need to know how many physically contiguous pages
165            we'll need for the bootmap.  */
166         bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
167
168         /* Now find a good region where to allocate the bootmap.  */
169         for_each_mem_cluster(memdesc, cluster, i) {
170                 if (cluster->usage & 3)
171                         continue;
172
173                 start = cluster->start_pfn;
174                 end = start + cluster->numpages;
175
176                 if (start >= node_max_pfn || end <= node_min_pfn)
177                         continue;
178
179                 if (end > node_max_pfn)
180                         end = node_max_pfn;
181                 if (start < node_min_pfn)
182                         start = node_min_pfn;
183
184                 if (start < start_kernel_pfn) {
185                         if (end > end_kernel_pfn
186                             && end - end_kernel_pfn >= bootmap_pages) {
187                                 bootmap_start = end_kernel_pfn;
188                                 break;
189                         } else if (end > start_kernel_pfn)
190                                 end = start_kernel_pfn;
191                 } else if (start < end_kernel_pfn)
192                         start = end_kernel_pfn;
193                 if (end - start >= bootmap_pages) {
194                         bootmap_start = start;
195                         break;
196                 }
197         }
198
199         if (bootmap_start == -1)
200                 panic("couldn't find a contiguous place for the bootmap");
201
202         /* Allocate the bootmap and mark the whole MM as reserved.  */
203         bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
204                                          node_min_pfn, node_max_pfn);
205         DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
206                  bootmap_start, bootmap_size, bootmap_pages);
207
208         /* Mark the free regions.  */
209         for_each_mem_cluster(memdesc, cluster, i) {
210                 if (cluster->usage & 3)
211                         continue;
212
213                 start = cluster->start_pfn;
214                 end = cluster->start_pfn + cluster->numpages;
215
216                 if (start >= node_max_pfn || end <= node_min_pfn)
217                         continue;
218
219                 if (end > node_max_pfn)
220                         end = node_max_pfn;
221                 if (start < node_min_pfn)
222                         start = node_min_pfn;
223
224                 if (start < start_kernel_pfn) {
225                         if (end > end_kernel_pfn) {
226                                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
227                                              (PFN_PHYS(start_kernel_pfn)
228                                               - PFN_PHYS(start)));
229                                 printk(" freeing pages %ld:%ld\n",
230                                        start, start_kernel_pfn);
231                                 start = end_kernel_pfn;
232                         } else if (end > start_kernel_pfn)
233                                 end = start_kernel_pfn;
234                 } else if (start < end_kernel_pfn)
235                         start = end_kernel_pfn;
236                 if (start >= end)
237                         continue;
238
239                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
240                 printk(" freeing pages %ld:%ld\n", start, end);
241         }
242
243         /* Reserve the bootmap memory.  */
244         reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
245                         bootmap_size, BOOTMEM_DEFAULT);
246         printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
247
248         node_set_online(nid);
249 }
250
251 void __init
252 setup_memory(void *kernel_end)
253 {
254         int nid;
255
256         show_mem_layout();
257
258         nodes_clear(node_online_map);
259
260         min_low_pfn = ~0UL;
261         max_low_pfn = 0UL;
262         for (nid = 0; nid < MAX_NUMNODES; nid++)
263                 setup_memory_node(nid, kernel_end);
264
265 #ifdef CONFIG_BLK_DEV_INITRD
266         initrd_start = INITRD_START;
267         if (initrd_start) {
268                 extern void *move_initrd(unsigned long);
269
270                 initrd_end = initrd_start+INITRD_SIZE;
271                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
272                        (void *) initrd_start, INITRD_SIZE);
273
274                 if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
275                         if (!move_initrd(PFN_PHYS(max_low_pfn)))
276                                 printk("initrd extends beyond end of memory "
277                                        "(0x%08lx > 0x%p)\ndisabling initrd\n",
278                                        initrd_end,
279                                        phys_to_virt(PFN_PHYS(max_low_pfn)));
280                 } else {
281                         nid = kvaddr_to_nid(initrd_start);
282                         reserve_bootmem_node(NODE_DATA(nid),
283                                              virt_to_phys((void *)initrd_start),
284                                              INITRD_SIZE, BOOTMEM_DEFAULT);
285                 }
286         }
287 #endif /* CONFIG_BLK_DEV_INITRD */
288 }
289
290 void __init paging_init(void)
291 {
292         unsigned int    nid;
293         unsigned long   zones_size[MAX_NR_ZONES] = {0, };
294         unsigned long   dma_local_pfn;
295
296         /*
297          * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
298          * in the NUMA model, for now we convert it to a pfn and
299          * we interpret this pfn as a local per-node information.
300          * This issue isn't very important since none of these machines
301          * have legacy ISA slots anyways.
302          */
303         dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
304
305         for_each_online_node(nid) {
306                 bootmem_data_t *bdata = &bootmem_node_data[nid];
307                 unsigned long start_pfn = bdata->node_min_pfn;
308                 unsigned long end_pfn = bdata->node_low_pfn;
309
310                 if (dma_local_pfn >= end_pfn - start_pfn)
311                         zones_size[ZONE_DMA] = end_pfn - start_pfn;
312                 else {
313                         zones_size[ZONE_DMA] = dma_local_pfn;
314                         zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
315                 }
316                 node_set_state(nid, N_NORMAL_MEMORY);
317                 free_area_init_node(nid, zones_size, start_pfn, NULL);
318         }
319
320         /* Initialize the kernel's ZERO_PGE. */
321         memset((void *)ZERO_PGE, 0, PAGE_SIZE);
322 }