aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/sgi-ip27/ip27-memory.c
blob: efe6971fc800f7ebdb6fedce429a3345b5aaf881 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2000, 05 by Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2000 by Silicon Graphics, Inc.
 * Copyright (C) 2004 by Christoph Hellwig
 *
 * On SGI IP27 the ARC memory configuration data is completly bogus but
 * alternate easier to use mechanisms are available.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/module.h>
#include <linux/nodemask.h>
#include <linux/swap.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
#include <asm/page.h>
#include <asm/sections.h>

#include <asm/sn/arch.h>
#include <asm/sn/hub.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/sn_private.h>


#define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
#define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)

#define SLOT_IGNORED		0xffff

static short __initdata slot_lastfilled_cache[MAX_COMPACT_NODES];
static unsigned short __initdata slot_psize_cache[MAX_COMPACT_NODES][MAX_MEM_SLOTS];
static struct bootmem_data __initdata plat_node_bdata[MAX_COMPACT_NODES];

struct node_data *__node_data[MAX_COMPACT_NODES];

EXPORT_SYMBOL(__node_data);

static int fine_mode;

static int is_fine_dirmode(void)
{
	return (((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK)
	        >> NSRI_REGIONSIZE_SHFT) & REGIONSIZE_FINE);
}

static hubreg_t get_region(cnodeid_t cnode)
{
	if (fine_mode)
		return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_FINEREG_SHFT;
	else
		return COMPACT_TO_NASID_NODEID(cnode) >> NASID_TO_COARSEREG_SHFT;
}

static hubreg_t region_mask;

static void gen_region_mask(hubreg_t *region_mask)
{
	cnodeid_t cnode;

	(*region_mask) = 0;
	for_each_online_node(cnode) {
		(*region_mask) |= 1ULL << get_region(cnode);
	}
}

#define	rou_rflag	rou_flags

static int router_distance;

static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
{
	klrou_t *router;
	lboard_t *brd;
	int	port;

	if (router_a->rou_rflag == 1)
		return;

	if (depth >= router_distance)
		return;

	router_a->rou_rflag = 1;

	for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
		if (router_a->rou_port[port].port_nasid == INVALID_NASID)
			continue;

		brd = (lboard_t *)NODE_OFFSET_TO_K0(
			router_a->rou_port[port].port_nasid,
			router_a->rou_port[port].port_offset);

		if (brd->brd_type == KLTYPE_ROUTER) {
			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
			if (router == router_b) {
				if (depth < router_distance)
					router_distance = depth;
			}
			else
				router_recurse(router, router_b, depth + 1);
		}
	}

	router_a->rou_rflag = 0;
}

unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];

static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
{
	klrou_t *router, *router_a = NULL, *router_b = NULL;
	lboard_t *brd, *dest_brd;
	cnodeid_t cnode;
	nasid_t nasid;
	int port;

	/* Figure out which routers nodes in question are connected to */
	for_each_online_node(cnode) {
		nasid = COMPACT_TO_NASID_NODEID(cnode);

		if (nasid == -1) continue;

		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
					KLTYPE_ROUTER);

		if (!brd)
			continue;

		do {
			if (brd->brd_flags & DUPLICATE_BOARD)
				continue;

			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
			router->rou_rflag = 0;

			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
				if (router->rou_port[port].port_nasid == INVALID_NASID)
					continue;

				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
					router->rou_port[port].port_nasid,
					router->rou_port[port].port_offset);

				if (dest_brd->brd_type == KLTYPE_IP27) {
					if (dest_brd->brd_nasid == nasid_a)
						router_a = router;
					if (dest_brd->brd_nasid == nasid_b)
						router_b = router;
				}
			}

		} while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
	}

	if (router_a == NULL) {
		printk("node_distance: router_a NULL\n");
		return -1;
	}
	if (router_b == NULL) {
		printk("node_distance: router_b NULL\n");
		return -1;
	}

	if (nasid_a == nasid_b)
		return 0;

	if (router_a == router_b)
		return 1;

	router_distance = 100;
	router_recurse(router_a, router_b, 2);

	return router_distance;
}

static void __init init_topology_matrix(void)
{
	nasid_t nasid, nasid2;
	cnodeid_t row, col;

	for (row = 0; row < MAX_COMPACT_NODES; row++)
		for (col = 0; col < MAX_COMPACT_NODES; col++)
			__node_distances[row][col] = -1;

	for_each_online_node(row) {
		nasid = COMPACT_TO_NASID_NODEID(row);
		for_each_online_node(col) {
			nasid2 = COMPACT_TO_NASID_NODEID(col);
			__node_distances[row][col] =
				compute_node_distance(nasid, nasid2);
		}
	}
}

static void __init dump_topology(void)
{
	nasid_t nasid;
	cnodeid_t cnode;
	lboard_t *brd, *dest_brd;
	int port;
	int router_num = 0;
	klrou_t *router;
	cnodeid_t row, col;

	printk("************** Topology ********************\n");

	printk("    ");
	for_each_online_node(col)
		printk("%02d ", col);
	printk("\n");
	for_each_online_node(row) {
		printk("%02d  ", row);
		for_each_online_node(col)
			printk("%2d ", node_distance(row, col));
		printk("\n");
	}

	for_each_online_node(cnode) {
		nasid = COMPACT_TO_NASID_NODEID(cnode);

		if (nasid == -1) continue;

		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
					KLTYPE_ROUTER);

		if (!brd)
			continue;

		do {
			if (brd->brd_flags & DUPLICATE_BOARD)
				continue;
			printk("Router %d:", router_num);
			router_num++;

			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);

			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
				if (router->rou_port[port].port_nasid == INVALID_NASID)
					continue;

				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
					router->rou_port[port].port_nasid,
					router->rou_port[port].port_offset);

				if (dest_brd->brd_type == KLTYPE_IP27)
					printk(" %d", dest_brd->brd_nasid);
				if (dest_brd->brd_type == KLTYPE_ROUTER)
					printk(" r");
			}
			printk("\n");

		} while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
	}
}

static pfn_t __init slot_getbasepfn(cnodeid_t cnode, int slot)
{
	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);

	return ((pfn_t)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
}

/*
 * Return the number of pages of memory provided by the given slot
 * on the specified node.
 */
static pfn_t __init slot_getsize(cnodeid_t node, int slot)
{
	return (pfn_t) slot_psize_cache[node][slot];
}

/*
 * Return highest slot filled
 */
static int __init node_getlastslot(cnodeid_t node)
{
	return (int) slot_lastfilled_cache[node];
}

/*
 * Return the pfn of the last free page of memory on a node.
 */
static pfn_t __init node_getmaxclick(cnodeid_t node)
{
	pfn_t	slot_psize;
	int	slot;

	/*
	 * Start at the top slot. When we find a slot with memory in it,
	 * that's the winner.
	 */
	for (slot = (MAX_MEM_SLOTS - 1); slot >= 0; slot--) {
		if ((slot_psize = slot_getsize(node, slot))) {
			if (slot_psize == SLOT_IGNORED)
				continue;
			/* Return the basepfn + the slot size, minus 1. */
			return slot_getbasepfn(node, slot) + slot_psize - 1;
		}
	}

	/*
	 * If there's no memory on the node, return 0. This is likely
	 * to cause problems.
	 */
	return 0;
}

static pfn_t __init slot_psize_compute(cnodeid_t node, int slot)
{
	nasid_t nasid;
	lboard_t *brd;
	klmembnk_t *banks;
	unsigned long size;

	nasid = COMPACT_TO_NASID_NODEID(node);
	/* Find the node board */
	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
	if (!brd)
		return 0;

	/* Get the memory bank structure */
	banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
	if (!banks)
		return 0;

	/* Size in _Megabytes_ */
	size = (unsigned long)banks->membnk_bnksz[slot/4];

	/* hack for 128 dimm banks */
	if (size <= 128) {
		if (slot % 4 == 0) {
			size <<= 20;		/* size in bytes */
			return(size >> PAGE_SHIFT);
		} else
			return 0;
	} else {
		size /= 4;
		size <<= 20;
		return size >> PAGE_SHIFT;
	}
}

static void __init mlreset(void)
{
	int i;

	master_nasid = get_nasid();
	fine_mode = is_fine_dirmode();

	/*
	 * Probe for all CPUs - this creates the cpumask and sets up the
	 * mapping tables.  We need to do this as early as possible.
	 */
#ifdef CONFIG_SMP
	cpu_node_probe();
#endif

	init_topology_matrix();
	dump_topology();

	gen_region_mask(&region_mask);

	setup_replication_mask();

	/*
	 * Set all nodes' calias sizes to 8k
	 */
	for_each_online_node(i) {
		nasid_t nasid;

		nasid = COMPACT_TO_NASID_NODEID(i);

		/*
		 * Always have node 0 in the region mask, otherwise
		 * CALIAS accesses get exceptions since the hub
		 * thinks it is a node 0 address.
		 */
		REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
#ifdef CONFIG_REPLICATE_EXHANDLERS
		REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
#else
		REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
#endif

#ifdef LATER
		/*
		 * Set up all hubs to have a big window pointing at
		 * widget 0. Memory mode, widget 0, offset 0
		 */
		REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
			((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
			(0 << IIO_ITTE_WIDGET_SHIFT)));
#endif
	}
}

static void __init szmem(void)
{
	pfn_t slot_psize, slot0sz = 0, nodebytes;	/* Hack to detect problem configs */
	int slot, ignore;
	cnodeid_t node;

	num_physpages = 0;

	for_each_online_node(node) {
		ignore = nodebytes = 0;
		for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
			slot_psize = slot_psize_compute(node, slot);
			if (slot == 0)
				slot0sz = slot_psize;
			/*
			 * We need to refine the hack when we have replicated
			 * kernel text.
			 */
			nodebytes += (1LL << SLOT_SHIFT);
			if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
						(slot0sz << PAGE_SHIFT))
				ignore = 1;
			if (ignore && slot_psize) {
				printk("Ignoring slot %d onwards on node %d\n",
								slot, node);
				slot_psize_cache[node][slot] = SLOT_IGNORED;
				slot = MAX_MEM_SLOTS;
				continue;
			}
			num_physpages += slot_psize;
			slot_psize_cache[node][slot] =
					(unsigned short) slot_psize;
			if (slot_psize)
				slot_lastfilled_cache[node] = slot;
		}
	}
}

static void __init node_mem_init(cnodeid_t node)
{
	pfn_t slot_firstpfn = slot_getbasepfn(node, 0);
	pfn_t slot_lastpfn = slot_firstpfn + slot_getsize(node, 0);
	pfn_t slot_freepfn = node_getfirstfree(node);
	struct pglist_data *pd;
	unsigned long bootmap_size;

	/*
	 * Allocate the node data structures on the node first.
	 */
	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);

	pd = NODE_DATA(node);
	pd->bdata = &plat_node_bdata[node];

	cpus_clear(hub_data(node)->h_cpus);

	slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
			       sizeof(struct hub_data));

  	bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
					slot_firstpfn, slot_lastpfn);
	free_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
			(slot_lastpfn - slot_firstpfn) << PAGE_SHIFT);
	reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
		((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size);
}

/*
 * A node with nothing.  We use it to avoid any special casing in
 * node_to_cpumask
 */
static struct node_data null_node = {
	.hub = {
		.h_cpus = CPU_MASK_NONE
	}
};

/*
 * Currently, the intranode memory hole support assumes that each slot
 * contains at least 32 MBytes of memory. We assume all bootmem data
 * fits on the first slot.
 */
void __init prom_meminit(void)
{
	cnodeid_t node;

	mlreset();
	szmem();

	for (node = 0; node < MAX_COMPACT_NODES; node++) {
		if (node_online(node)) {
			node_mem_init(node);
			continue;
		}
		__node_data[node] = &null_node;
	}
}

unsigned long __init prom_free_prom_memory(void)
{
	/* We got nothing to free here ...  */
	return 0;
}

extern void pagetable_init(void);
extern unsigned long setup_zero_pages(void);

void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
	unsigned node;

	pagetable_init();

	for_each_online_node(node) {
		pfn_t start_pfn = slot_getbasepfn(node, 0);
		pfn_t end_pfn = node_getmaxclick(node) + 1;

		zones_size[ZONE_DMA] = end_pfn - start_pfn;
		free_area_init_node(node, NODE_DATA(node),
				zones_size, start_pfn, NULL);

		if (end_pfn > max_low_pfn)
			max_low_pfn = end_pfn;
	}
}

void __init mem_init(void)
{
	unsigned long codesize, datasize, initsize, tmp;
	unsigned node;

	high_memory = (void *) __va(num_physpages << PAGE_SHIFT);

	for_each_online_node(node) {
		unsigned slot, numslots;
		struct page *end, *p;

		/*
		 * This will free up the bootmem, ie, slot 0 memory.
		 */
		totalram_pages += free_all_bootmem_node(NODE_DATA(node));

		/*
		 * We need to manually do the other slots.
		 */
		numslots = node_getlastslot(node);
		for (slot = 1; slot <= numslots; slot++) {
			p = nid_page_nr(node, slot_getbasepfn(node, slot) -
					      slot_getbasepfn(node, 0));

			/*
			 * Free valid memory in current slot.
			 */
			for (end = p + slot_getsize(node, slot); p < end; p++) {
				/* if (!page_is_ram(pgnr)) continue; */
				/* commented out until page_is_ram works */
				ClearPageReserved(p);
				init_page_count(p);
				__free_page(p);
				totalram_pages++;
			}
		}
	}

	totalram_pages -= setup_zero_pages();	/* This comes from node 0 */

	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

	tmp = nr_free_pages();
	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
	       tmp << (PAGE_SHIFT-10),
	       num_physpages << (PAGE_SHIFT-10),
	       codesize >> 10,
	       (num_physpages - tmp) << (PAGE_SHIFT-10),
	       datasize >> 10,
	       initsize >> 10,
	       (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
}