Merge branch 'linus' into timers/hpet
[linux-2.6] / 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 static struct bootmem_data __initdata plat_node_bdata[MAX_COMPACT_NODES];
37
38 struct node_data *__node_data[MAX_COMPACT_NODES];
39
40 EXPORT_SYMBOL(__node_data);
41
42 static int fine_mode;
43
44 static int is_fine_dirmode(void)
45 {
46         return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
47                 >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
48 }
49
50 static hubreg_t get_region(cnodeid_t cnode)
51 {
52         if (fine_mode)
53                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
54         else
55                 return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
56 }
57
58 static hubreg_t region_mask;
59
60 static void gen_region_mask(hubreg_t *region_mask)
61 {
62         cnodeid_t cnode;
63
64         (*region_mask) = 0;
65         for_each_online_node(cnode) {
66                 (*region_mask) |= 1ULL << get_region(cnode);
67         }
68 }
69
70 #define rou_rflag       rou_flags
71
72 static int router_distance;
73
74 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
75 {
76         klrou_t *router;
77         lboard_t *brd;
78         int     port;
79
80         if (router_a->rou_rflag == 1)
81                 return;
82
83         if (depth >= router_distance)
84                 return;
85
86         router_a->rou_rflag = 1;
87
88         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
89                 if (router_a->rou_port[port].port_nasid == INVALID_NASID)
90                         continue;
91
92                 brd = (lboard_t *)NODE_OFFSET_TO_K0(
93                         router_a->rou_port[port].port_nasid,
94                         router_a->rou_port[port].port_offset);
95
96                 if (brd->brd_type == KLTYPE_ROUTER) {
97                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
98                         if (router == router_b) {
99                                 if (depth < router_distance)
100                                         router_distance = depth;
101                         }
102                         else
103                                 router_recurse(router, router_b, depth + 1);
104                 }
105         }
106
107         router_a->rou_rflag = 0;
108 }
109
110 unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
111
112 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
113 {
114         klrou_t *router, *router_a = NULL, *router_b = NULL;
115         lboard_t *brd, *dest_brd;
116         cnodeid_t cnode;
117         nasid_t nasid;
118         int port;
119
120         /* Figure out which routers nodes in question are connected to */
121         for_each_online_node(cnode) {
122                 nasid = COMPACT_TO_NASID_NODEID(cnode);
123
124                 if (nasid == -1) continue;
125
126                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
127                                         KLTYPE_ROUTER);
128
129                 if (!brd)
130                         continue;
131
132                 do {
133                         if (brd->brd_flags & DUPLICATE_BOARD)
134                                 continue;
135
136                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
137                         router->rou_rflag = 0;
138
139                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
140                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
141                                         continue;
142
143                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
144                                         router->rou_port[port].port_nasid,
145                                         router->rou_port[port].port_offset);
146
147                                 if (dest_brd->brd_type == KLTYPE_IP27) {
148                                         if (dest_brd->brd_nasid == nasid_a)
149                                                 router_a = router;
150                                         if (dest_brd->brd_nasid == nasid_b)
151                                                 router_b = router;
152                                 }
153                         }
154
155                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
156         }
157
158         if (router_a == NULL) {
159                 printk("node_distance: router_a NULL\n");
160                 return -1;
161         }
162         if (router_b == NULL) {
163                 printk("node_distance: router_b NULL\n");
164                 return -1;
165         }
166
167         if (nasid_a == nasid_b)
168                 return 0;
169
170         if (router_a == router_b)
171                 return 1;
172
173         router_distance = 100;
174         router_recurse(router_a, router_b, 2);
175
176         return router_distance;
177 }
178
179 static void __init init_topology_matrix(void)
180 {
181         nasid_t nasid, nasid2;
182         cnodeid_t row, col;
183
184         for (row = 0; row < MAX_COMPACT_NODES; row++)
185                 for (col = 0; col < MAX_COMPACT_NODES; col++)
186                         __node_distances[row][col] = -1;
187
188         for_each_online_node(row) {
189                 nasid = COMPACT_TO_NASID_NODEID(row);
190                 for_each_online_node(col) {
191                         nasid2 = COMPACT_TO_NASID_NODEID(col);
192                         __node_distances[row][col] =
193                                 compute_node_distance(nasid, nasid2);
194                 }
195         }
196 }
197
198 static void __init dump_topology(void)
199 {
200         nasid_t nasid;
201         cnodeid_t cnode;
202         lboard_t *brd, *dest_brd;
203         int port;
204         int router_num = 0;
205         klrou_t *router;
206         cnodeid_t row, col;
207
208         printk("************** Topology ********************\n");
209
210         printk("    ");
211         for_each_online_node(col)
212                 printk("%02d ", col);
213         printk("\n");
214         for_each_online_node(row) {
215                 printk("%02d  ", row);
216                 for_each_online_node(col)
217                         printk("%2d ", node_distance(row, col));
218                 printk("\n");
219         }
220
221         for_each_online_node(cnode) {
222                 nasid = COMPACT_TO_NASID_NODEID(cnode);
223
224                 if (nasid == -1) continue;
225
226                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
227                                         KLTYPE_ROUTER);
228
229                 if (!brd)
230                         continue;
231
232                 do {
233                         if (brd->brd_flags & DUPLICATE_BOARD)
234                                 continue;
235                         printk("Router %d:", router_num);
236                         router_num++;
237
238                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
239
240                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
241                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
242                                         continue;
243
244                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
245                                         router->rou_port[port].port_nasid,
246                                         router->rou_port[port].port_offset);
247
248                                 if (dest_brd->brd_type == KLTYPE_IP27)
249                                         printk(" %d", dest_brd->brd_nasid);
250                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
251                                         printk(" r");
252                         }
253                         printk("\n");
254
255                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
256         }
257 }
258
259 static pfn_t __init slot_getbasepfn(cnodeid_t cnode, int slot)
260 {
261         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
262
263         return ((pfn_t)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
264 }
265
266 static pfn_t __init slot_psize_compute(cnodeid_t node, int slot)
267 {
268         nasid_t nasid;
269         lboard_t *brd;
270         klmembnk_t *banks;
271         unsigned long size;
272
273         nasid = COMPACT_TO_NASID_NODEID(node);
274         /* Find the node board */
275         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
276         if (!brd)
277                 return 0;
278
279         /* Get the memory bank structure */
280         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
281         if (!banks)
282                 return 0;
283
284         /* Size in _Megabytes_ */
285         size = (unsigned long)banks->membnk_bnksz[slot/4];
286
287         /* hack for 128 dimm banks */
288         if (size <= 128) {
289                 if (slot % 4 == 0) {
290                         size <<= 20;            /* size in bytes */
291                         return(size >> PAGE_SHIFT);
292                 } else
293                         return 0;
294         } else {
295                 size /= 4;
296                 size <<= 20;
297                 return size >> PAGE_SHIFT;
298         }
299 }
300
301 static void __init mlreset(void)
302 {
303         int i;
304
305         master_nasid = get_nasid();
306         fine_mode = is_fine_dirmode();
307
308         /*
309          * Probe for all CPUs - this creates the cpumask and sets up the
310          * mapping tables.  We need to do this as early as possible.
311          */
312 #ifdef CONFIG_SMP
313         cpu_node_probe();
314 #endif
315
316         init_topology_matrix();
317         dump_topology();
318
319         gen_region_mask(&region_mask);
320
321         setup_replication_mask();
322
323         /*
324          * Set all nodes' calias sizes to 8k
325          */
326         for_each_online_node(i) {
327                 nasid_t nasid;
328
329                 nasid = COMPACT_TO_NASID_NODEID(i);
330
331                 /*
332                  * Always have node 0 in the region mask, otherwise
333                  * CALIAS accesses get exceptions since the hub
334                  * thinks it is a node 0 address.
335                  */
336                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
337 #ifdef CONFIG_REPLICATE_EXHANDLERS
338                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
339 #else
340                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
341 #endif
342
343 #ifdef LATER
344                 /*
345                  * Set up all hubs to have a big window pointing at
346                  * widget 0. Memory mode, widget 0, offset 0
347                  */
348                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
349                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
350                         (0 << IIO_ITTE_WIDGET_SHIFT)));
351 #endif
352         }
353 }
354
355 static void __init szmem(void)
356 {
357         pfn_t slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
358         int slot;
359         cnodeid_t node;
360
361         num_physpages = 0;
362
363         for_each_online_node(node) {
364                 nodebytes = 0;
365                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
366                         slot_psize = slot_psize_compute(node, slot);
367                         if (slot == 0)
368                                 slot0sz = slot_psize;
369                         /*
370                          * We need to refine the hack when we have replicated
371                          * kernel text.
372                          */
373                         nodebytes += (1LL << SLOT_SHIFT);
374
375                         if (!slot_psize)
376                                 continue;
377
378                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
379                                                 (slot0sz << PAGE_SHIFT)) {
380                                 printk("Ignoring slot %d onwards on node %d\n",
381                                                                 slot, node);
382                                 slot = MAX_MEM_SLOTS;
383                                 continue;
384                         }
385                         num_physpages += slot_psize;
386                         add_active_range(node, slot_getbasepfn(node, slot),
387                                          slot_getbasepfn(node, slot) + slot_psize);
388                 }
389         }
390 }
391
392 static void __init node_mem_init(cnodeid_t node)
393 {
394         pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
395         pfn_t slot_freepfn = node_getfirstfree(node);
396         unsigned long bootmap_size;
397         pfn_t start_pfn, end_pfn;
398
399         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
400
401         /*
402          * Allocate the node data structures on the node first.
403          */
404         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
405
406         NODE_DATA(node)->bdata = &plat_node_bdata[node];
407         NODE_DATA(node)->node_start_pfn = start_pfn;
408         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
409
410         cpus_clear(hub_data(node)->h_cpus);
411
412         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
413                                sizeof(struct hub_data));
414
415         bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
416                                         start_pfn, end_pfn);
417         free_bootmem_with_active_regions(node, end_pfn);
418         reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
419                 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
420                 BOOTMEM_DEFAULT);
421         sparse_memory_present_with_active_regions(node);
422 }
423
424 /*
425  * A node with nothing.  We use it to avoid any special casing in
426  * node_to_cpumask
427  */
428 static struct node_data null_node = {
429         .hub = {
430                 .h_cpus = CPU_MASK_NONE
431         }
432 };
433
434 /*
435  * Currently, the intranode memory hole support assumes that each slot
436  * contains at least 32 MBytes of memory. We assume all bootmem data
437  * fits on the first slot.
438  */
439 void __init prom_meminit(void)
440 {
441         cnodeid_t node;
442
443         mlreset();
444         szmem();
445
446         for (node = 0; node < MAX_COMPACT_NODES; node++) {
447                 if (node_online(node)) {
448                         node_mem_init(node);
449                         continue;
450                 }
451                 __node_data[node] = &null_node;
452         }
453 }
454
455 void __init prom_free_prom_memory(void)
456 {
457         /* We got nothing to free here ...  */
458 }
459
460 extern unsigned long setup_zero_pages(void);
461
462 void __init paging_init(void)
463 {
464         unsigned long zones_size[MAX_NR_ZONES] = {0, };
465         unsigned node;
466
467         pagetable_init();
468
469         for_each_online_node(node) {
470                 pfn_t start_pfn, end_pfn;
471
472                 get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
473
474                 if (end_pfn > max_low_pfn)
475                         max_low_pfn = end_pfn;
476         }
477         zones_size[ZONE_NORMAL] = max_low_pfn;
478         free_area_init_nodes(zones_size);
479 }
480
481 void __init mem_init(void)
482 {
483         unsigned long codesize, datasize, initsize, tmp;
484         unsigned node;
485
486         high_memory = (void *) __va(num_physpages << PAGE_SHIFT);
487
488         for_each_online_node(node) {
489                 /*
490                  * This will free up the bootmem, ie, slot 0 memory.
491                  */
492                 totalram_pages += free_all_bootmem_node(NODE_DATA(node));
493         }
494
495         totalram_pages -= setup_zero_pages();   /* This comes from node 0 */
496
497         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
498         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
499         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
500
501         tmp = nr_free_pages();
502         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
503                "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
504                tmp << (PAGE_SHIFT-10),
505                num_physpages << (PAGE_SHIFT-10),
506                codesize >> 10,
507                (num_physpages - tmp) << (PAGE_SHIFT-10),
508                datasize >> 10,
509                initsize >> 10,
510                (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
511 }