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/arch/mips/sgi-ip27/ip27-memory.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 509 lines | 356 code | 100 blank | 53 comment | 62 complexity | 3264ed9832f230b7d4b103038057279e MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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
 36struct node_data *__node_data[MAX_COMPACT_NODES];
 37
 38EXPORT_SYMBOL(__node_data);
 39
 40static int fine_mode;
 41
 42static 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
 48static 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
 56static hubreg_t region_mask;
 57
 58static 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
 70static int router_distance;
 71
 72static 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
108unsigned char __node_distances[MAX_COMPACT_NODES][MAX_COMPACT_NODES];
109
110static 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
177static 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
196static 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
257static 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
264static 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
299static 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
353static 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
390static 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 * cpumask_of_node
425 */
426static 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 */
437void __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
453void __init prom_free_prom_memory(void)
454{
455	/* We got nothing to free here ...  */
456}
457
458extern unsigned long setup_zero_pages(void);
459
460void __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
479void __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	       totalhigh_pages << (PAGE_SHIFT-10));
509}