mm: move bootmem descriptors definition to a single place
[linux-2.6.git] / arch / mips / sgi-ip27 / ip27-memory.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2000, 05 by Ralf Baechle (ralf@linux-mips.org)
7  * Copyright (C) 2000 by Silicon Graphics, Inc.
8  * Copyright (C) 2004 by Christoph Hellwig
9  *
10  * On SGI IP27 the ARC memory configuration data is completly bogus but
11  * alternate easier to use mechanisms are available.
12  */
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/mmzone.h>
17 #include <linux/module.h>
18 #include <linux/nodemask.h>
19 #include <linux/swap.h>
20 #include <linux/bootmem.h>
21 #include <linux/pfn.h>
22 #include <linux/highmem.h>
23 #include <asm/page.h>
24 #include <asm/pgalloc.h>
25 #include <asm/sections.h>
26
27 #include <asm/sn/arch.h>
28 #include <asm/sn/hub.h>
29 #include <asm/sn/klconfig.h>
30 #include <asm/sn/sn_private.h>
31
32
33 #define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
34 #define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)
35
36 struct node_data *__node_data[MAX_COMPACT_NODES];
37
38 EXPORT_SYMBOL(__node_data);
39
40 static int fine_mode;
41
42 static int is_fine_dirmode(void)
43 {
44         return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
45                 >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
46 }
47
48 static hubreg_t get_region(cnodeid_t cnode)
49 {
50         if (fine_mode)
51                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
52         else
53                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
54 }
55
56 static hubreg_t region_mask;
57
58 static void gen_region_mask(hubreg_t *region_mask)
59 {
60         cnodeid_t cnode;
61
62         (*region_mask) = 0;
63         for_each_online_node(cnode) {
64                 (*region_mask) |= 1ULL << get_region(cnode);
65         }
66 }
67
68 #define rou_rflag       rou_flags
69
70 static int router_distance;
71
72 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
73 {
74         klrou_t *router;
75         lboard_t *brd;
76         int     port;
77
78         if (router_a->rou_rflag == 1)
79                 return;
80
81         if (depth >= router_distance)
82                 return;
83
84         router_a->rou_rflag = 1;
85
86         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
87                 if (router_a->rou_port[port].port_nasid == INVALID_NASID)
88                         continue;
89
90                 brd = (lboard_t *)NODE_OFFSET_TO_K0(
91                         router_a->rou_port[port].port_nasid,
92                         router_a->rou_port[port].port_offset);
93
94                 if (brd->brd_type == KLTYPE_ROUTER) {
95                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
96                         if (router == router_b) {
97                                 if (depth < router_distance)
98                                         router_distance = depth;
99                         }
100                         else
101                                 router_recurse(router, router_b, depth + 1);
102                 }
103         }
104
105         router_a->rou_rflag = 0;
106 }
107
108 unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
109
110 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
111 {
112         klrou_t *router, *router_a = NULL, *router_b = NULL;
113         lboard_t *brd, *dest_brd;
114         cnodeid_t cnode;
115         nasid_t nasid;
116         int port;
117
118         /* Figure out which routers nodes in question are connected to */
119         for_each_online_node(cnode) {
120                 nasid = COMPACT_TO_NASID_NODEID(cnode);
121
122                 if (nasid == -1) continue;
123
124                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
125                                         KLTYPE_ROUTER);
126
127                 if (!brd)
128                         continue;
129
130                 do {
131                         if (brd->brd_flags & DUPLICATE_BOARD)
132                                 continue;
133
134                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
135                         router->rou_rflag = 0;
136
137                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
138                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
139                                         continue;
140
141                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
142                                         router->rou_port[port].port_nasid,
143                                         router->rou_port[port].port_offset);
144
145                                 if (dest_brd->brd_type == KLTYPE_IP27) {
146                                         if (dest_brd->brd_nasid == nasid_a)
147                                                 router_a = router;
148                                         if (dest_brd->brd_nasid == nasid_b)
149                                                 router_b = router;
150                                 }
151                         }
152
153                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
154         }
155
156         if (router_a == NULL) {
157                 printk("node_distance: router_a NULL\n");
158                 return -1;
159         }
160         if (router_b == NULL) {
161                 printk("node_distance: router_b NULL\n");
162                 return -1;
163         }
164
165         if (nasid_a == nasid_b)
166                 return 0;
167
168         if (router_a == router_b)
169                 return 1;
170
171         router_distance = 100;
172         router_recurse(router_a, router_b, 2);
173
174         return router_distance;
175 }
176
177 static void __init init_topology_matrix(void)
178 {
179         nasid_t nasid, nasid2;
180         cnodeid_t row, col;
181
182         for (row = 0; row < MAX_COMPACT_NODES; row++)
183                 for (col = 0; col < MAX_COMPACT_NODES; col++)
184                         __node_distances[row][col] = -1;
185
186         for_each_online_node(row) {
187                 nasid = COMPACT_TO_NASID_NODEID(row);
188                 for_each_online_node(col) {
189                         nasid2 = COMPACT_TO_NASID_NODEID(col);
190                         __node_distances[row][col] =
191                                 compute_node_distance(nasid, nasid2);
192                 }
193         }
194 }
195
196 static void __init dump_topology(void)
197 {
198         nasid_t nasid;
199         cnodeid_t cnode;
200         lboard_t *brd, *dest_brd;
201         int port;
202         int router_num = 0;
203         klrou_t *router;
204         cnodeid_t row, col;
205
206         printk("************** Topology ********************\n");
207
208         printk("    ");
209         for_each_online_node(col)
210                 printk("%02d ", col);
211         printk("\n");
212         for_each_online_node(row) {
213                 printk("%02d  ", row);
214                 for_each_online_node(col)
215                         printk("%2d ", node_distance(row, col));
216                 printk("\n");
217         }
218
219         for_each_online_node(cnode) {
220                 nasid = COMPACT_TO_NASID_NODEID(cnode);
221
222                 if (nasid == -1) continue;
223
224                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
225                                         KLTYPE_ROUTER);
226
227                 if (!brd)
228                         continue;
229
230                 do {
231                         if (brd->brd_flags & DUPLICATE_BOARD)
232                                 continue;
233                         printk("Router %d:", router_num);
234                         router_num++;
235
236                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
237
238                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
239                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
240                                         continue;
241
242                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
243                                         router->rou_port[port].port_nasid,
244                                         router->rou_port[port].port_offset);
245
246                                 if (dest_brd->brd_type == KLTYPE_IP27)
247                                         printk(" %d", dest_brd->brd_nasid);
248                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
249                                         printk(" r");
250                         }
251                         printk("\n");
252
253                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
254         }
255 }
256
257 static pfn_t __init slot_getbasepfn(cnodeid_t cnode, int slot)
258 {
259         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
260
261         return ((pfn_t)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
262 }
263
264 static pfn_t __init slot_psize_compute(cnodeid_t node, int slot)
265 {
266         nasid_t nasid;
267         lboard_t *brd;
268         klmembnk_t *banks;
269         unsigned long size;
270
271         nasid = COMPACT_TO_NASID_NODEID(node);
272         /* Find the node board */
273         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
274         if (!brd)
275                 return 0;
276
277         /* Get the memory bank structure */
278         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
279         if (!banks)
280                 return 0;
281
282         /* Size in _Megabytes_ */
283         size = (unsigned long)banks->membnk_bnksz[slot/4];
284
285         /* hack for 128 dimm banks */
286         if (size <= 128) {
287                 if (slot % 4 == 0) {
288                         size <<= 20;            /* size in bytes */
289                         return(size >> PAGE_SHIFT);
290                 } else
291                         return 0;
292         } else {
293                 size /= 4;
294                 size <<= 20;
295                 return size >> PAGE_SHIFT;
296         }
297 }
298
299 static void __init mlreset(void)
300 {
301         int i;
302
303         master_nasid = get_nasid();
304         fine_mode = is_fine_dirmode();
305
306         /*
307          * Probe for all CPUs - this creates the cpumask and sets up the
308          * mapping tables.  We need to do this as early as possible.
309          */
310 #ifdef CONFIG_SMP
311         cpu_node_probe();
312 #endif
313
314         init_topology_matrix();
315         dump_topology();
316
317         gen_region_mask(&region_mask);
318
319         setup_replication_mask();
320
321         /*
322          * Set all nodes' calias sizes to 8k
323          */
324         for_each_online_node(i) {
325                 nasid_t nasid;
326
327                 nasid = COMPACT_TO_NASID_NODEID(i);
328
329                 /*
330                  * Always have node 0 in the region mask, otherwise
331                  * CALIAS accesses get exceptions since the hub
332                  * thinks it is a node 0 address.
333                  */
334                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
335 #ifdef CONFIG_REPLICATE_EXHANDLERS
336                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
337 #else
338                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
339 #endif
340
341 #ifdef LATER
342                 /*
343                  * Set up all hubs to have a big window pointing at
344                  * widget 0. Memory mode, widget 0, offset 0
345                  */
346                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
347                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
348                         (0 << IIO_ITTE_WIDGET_SHIFT)));
349 #endif
350         }
351 }
352
353 static void __init szmem(void)
354 {
355         pfn_t slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
356         int slot;
357         cnodeid_t node;
358
359         num_physpages = 0;
360
361         for_each_online_node(node) {
362                 nodebytes = 0;
363                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
364                         slot_psize = slot_psize_compute(node, slot);
365                         if (slot == 0)
366                                 slot0sz = slot_psize;
367                         /*
368                          * We need to refine the hack when we have replicated
369                          * kernel text.
370                          */
371                         nodebytes += (1LL << SLOT_SHIFT);
372
373                         if (!slot_psize)
374                                 continue;
375
376                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
377                                                 (slot0sz << PAGE_SHIFT)) {
378                                 printk("Ignoring slot %d onwards on node %d\n",
379                                                                 slot, node);
380                                 slot = MAX_MEM_SLOTS;
381                                 continue;
382                         }
383                         num_physpages += slot_psize;
384                         add_active_range(node, slot_getbasepfn(node, slot),
385                                          slot_getbasepfn(node, slot) + slot_psize);
386                 }
387         }
388 }
389
390 static void __init node_mem_init(cnodeid_t node)
391 {
392         pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
393         pfn_t slot_freepfn = node_getfirstfree(node);
394         unsigned long bootmap_size;
395         pfn_t start_pfn, end_pfn;
396
397         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
398
399         /*
400          * Allocate the node data structures on the node first.
401          */
402         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
403
404         NODE_DATA(node)->bdata = &bootmem_node_data[node];
405         NODE_DATA(node)->node_start_pfn = start_pfn;
406         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
407
408         cpus_clear(hub_data(node)->h_cpus);
409
410         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
411                                sizeof(struct hub_data));
412
413         bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
414                                         start_pfn, end_pfn);
415         free_bootmem_with_active_regions(node, end_pfn);
416         reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
417                 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
418                 BOOTMEM_DEFAULT);
419         sparse_memory_present_with_active_regions(node);
420 }
421
422 /*
423  * A node with nothing.  We use it to avoid any special casing in
424  * node_to_cpumask
425  */
426 static struct node_data null_node = {
427         .hub = {
428                 .h_cpus = CPU_MASK_NONE
429         }
430 };
431
432 /*
433  * Currently, the intranode memory hole support assumes that each slot
434  * contains at least 32 MBytes of memory. We assume all bootmem data
435  * fits on the first slot.
436  */
437 void __init prom_meminit(void)
438 {
439         cnodeid_t node;
440
441         mlreset();
442         szmem();
443
444         for (node = 0; node < MAX_COMPACT_NODES; node++) {
445                 if (node_online(node)) {
446                         node_mem_init(node);
447                         continue;
448                 }
449                 __node_data[node] = &null_node;
450         }
451 }
452
453 void __init prom_free_prom_memory(void)
454 {
455         /* We got nothing to free here ...  */
456 }
457
458 extern unsigned long setup_zero_pages(void);
459
460 void __init paging_init(void)
461 {
462         unsigned long zones_size[MAX_NR_ZONES] = {0, };
463         unsigned node;
464
465         pagetable_init();
466
467         for_each_online_node(node) {
468                 pfn_t start_pfn, end_pfn;
469
470                 get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
471
472                 if (end_pfn > max_low_pfn)
473                         max_low_pfn = end_pfn;
474         }
475         zones_size[ZONE_NORMAL] = max_low_pfn;
476         free_area_init_nodes(zones_size);
477 }
478
479 void __init mem_init(void)
480 {
481         unsigned long codesize, datasize, initsize, tmp;
482         unsigned node;
483
484         high_memory = (void *) __va(num_physpages << PAGE_SHIFT);
485
486         for_each_online_node(node) {
487                 /*
488                  * This will free up the bootmem, ie, slot 0 memory.
489                  */
490                 totalram_pages += free_all_bootmem_node(NODE_DATA(node));
491         }
492
493         totalram_pages -= setup_zero_pages();   /* This comes from node 0 */
494
495         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
496         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
497         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
498
499         tmp = nr_free_pages();
500         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
501                "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
502                tmp << (PAGE_SHIFT-10),
503                num_physpages << (PAGE_SHIFT-10),
504                codesize >> 10,
505                (num_physpages - tmp) << (PAGE_SHIFT-10),
506                datasize >> 10,
507                initsize >> 10,
508                (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
509 }