xref: /openbmc/linux/arch/mips/sgi-ip27/ip27-memory.c (revision 842ed298) 
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 completely bogus but
11  * alternate easier to use mechanisms are available.
12  */
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/memblock.h>
16 #include <linux/mm.h>
17 #include <linux/mmzone.h>
18 #include <linux/export.h>
19 #include <linux/nodemask.h>
20 #include <linux/swap.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/agent.h>
29 #include <asm/sn/klconfig.h>
30 
31 #include "ip27-common.h"
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_NUMNODES];
37 
38 EXPORT_SYMBOL(__node_data);
39 
40 static u64 gen_region_mask(void)
41 {
42 	int region_shift;
43 	u64 region_mask;
44 	nasid_t nasid;
45 
46 	region_shift = get_region_shift();
47 	region_mask = 0;
48 	for_each_online_node(nasid)
49 		region_mask |= BIT_ULL(nasid >> region_shift);
50 
51 	return region_mask;
52 }
53 
54 #define rou_rflag	rou_flags
55 
56 static int router_distance;
57 
58 static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
59 {
60 	klrou_t *router;
61 	lboard_t *brd;
62 	int	port;
63 
64 	if (router_a->rou_rflag == 1)
65 		return;
66 
67 	if (depth >= router_distance)
68 		return;
69 
70 	router_a->rou_rflag = 1;
71 
72 	for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
73 		if (router_a->rou_port[port].port_nasid == INVALID_NASID)
74 			continue;
75 
76 		brd = (lboard_t *)NODE_OFFSET_TO_K0(
77 			router_a->rou_port[port].port_nasid,
78 			router_a->rou_port[port].port_offset);
79 
80 		if (brd->brd_type == KLTYPE_ROUTER) {
81 			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
82 			if (router == router_b) {
83 				if (depth < router_distance)
84 					router_distance = depth;
85 			}
86 			else
87 				router_recurse(router, router_b, depth + 1);
88 		}
89 	}
90 
91 	router_a->rou_rflag = 0;
92 }
93 
94 unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
95 EXPORT_SYMBOL(__node_distances);
96 
97 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
98 {
99 	klrou_t *router, *router_a = NULL, *router_b = NULL;
100 	lboard_t *brd, *dest_brd;
101 	nasid_t nasid;
102 	int port;
103 
104 	/* Figure out which routers nodes in question are connected to */
105 	for_each_online_node(nasid) {
106 		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
107 					KLTYPE_ROUTER);
108 
109 		if (!brd)
110 			continue;
111 
112 		do {
113 			if (brd->brd_flags & DUPLICATE_BOARD)
114 				continue;
115 
116 			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
117 			router->rou_rflag = 0;
118 
119 			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
120 				if (router->rou_port[port].port_nasid == INVALID_NASID)
121 					continue;
122 
123 				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
124 					router->rou_port[port].port_nasid,
125 					router->rou_port[port].port_offset);
126 
127 				if (dest_brd->brd_type == KLTYPE_IP27) {
128 					if (dest_brd->brd_nasid == nasid_a)
129 						router_a = router;
130 					if (dest_brd->brd_nasid == nasid_b)
131 						router_b = router;
132 				}
133 			}
134 
135 		} while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
136 	}
137 
138 	if (nasid_a == nasid_b)
139 		return LOCAL_DISTANCE;
140 
141 	if (router_a == router_b)
142 		return LOCAL_DISTANCE + 1;
143 
144 	if (router_a == NULL) {
145 		pr_info("node_distance: router_a NULL\n");
146 		return 255;
147 	}
148 	if (router_b == NULL) {
149 		pr_info("node_distance: router_b NULL\n");
150 		return 255;
151 	}
152 
153 	router_distance = 100;
154 	router_recurse(router_a, router_b, 2);
155 
156 	return LOCAL_DISTANCE + router_distance;
157 }
158 
159 static void __init init_topology_matrix(void)
160 {
161 	nasid_t row, col;
162 
163 	for (row = 0; row < MAX_NUMNODES; row++)
164 		for (col = 0; col < MAX_NUMNODES; col++)
165 			__node_distances[row][col] = -1;
166 
167 	for_each_online_node(row) {
168 		for_each_online_node(col) {
169 			__node_distances[row][col] =
170 				compute_node_distance(row, col);
171 		}
172 	}
173 }
174 
175 static void __init dump_topology(void)
176 {
177 	nasid_t nasid;
178 	lboard_t *brd, *dest_brd;
179 	int port;
180 	int router_num = 0;
181 	klrou_t *router;
182 	nasid_t row, col;
183 
184 	pr_info("************** Topology ********************\n");
185 
186 	pr_info("    ");
187 	for_each_online_node(col)
188 		pr_cont("%02d ", col);
189 	pr_cont("\n");
190 	for_each_online_node(row) {
191 		pr_info("%02d  ", row);
192 		for_each_online_node(col)
193 			pr_cont("%2d ", node_distance(row, col));
194 		pr_cont("\n");
195 	}
196 
197 	for_each_online_node(nasid) {
198 		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
199 					KLTYPE_ROUTER);
200 
201 		if (!brd)
202 			continue;
203 
204 		do {
205 			if (brd->brd_flags & DUPLICATE_BOARD)
206 				continue;
207 			pr_cont("Router %d:", router_num);
208 			router_num++;
209 
210 			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
211 
212 			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
213 				if (router->rou_port[port].port_nasid == INVALID_NASID)
214 					continue;
215 
216 				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
217 					router->rou_port[port].port_nasid,
218 					router->rou_port[port].port_offset);
219 
220 				if (dest_brd->brd_type == KLTYPE_IP27)
221 					pr_cont(" %d", dest_brd->brd_nasid);
222 				if (dest_brd->brd_type == KLTYPE_ROUTER)
223 					pr_cont(" r");
224 			}
225 			pr_cont("\n");
226 
227 		} while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
228 	}
229 }
230 
231 static unsigned long __init slot_getbasepfn(nasid_t nasid, int slot)
232 {
233 	return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
234 }
235 
236 static unsigned long __init slot_psize_compute(nasid_t nasid, int slot)
237 {
238 	lboard_t *brd;
239 	klmembnk_t *banks;
240 	unsigned long size;
241 
242 	/* Find the node board */
243 	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
244 	if (!brd)
245 		return 0;
246 
247 	/* Get the memory bank structure */
248 	banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
249 	if (!banks)
250 		return 0;
251 
252 	/* Size in _Megabytes_ */
253 	size = (unsigned long)banks->membnk_bnksz[slot/4];
254 
255 	/* hack for 128 dimm banks */
256 	if (size <= 128) {
257 		if (slot % 4 == 0) {
258 			size <<= 20;		/* size in bytes */
259 			return size >> PAGE_SHIFT;
260 		} else
261 			return 0;
262 	} else {
263 		size /= 4;
264 		size <<= 20;
265 		return size >> PAGE_SHIFT;
266 	}
267 }
268 
269 static void __init mlreset(void)
270 {
271 	u64 region_mask;
272 	nasid_t nasid;
273 
274 	master_nasid = get_nasid();
275 
276 	/*
277 	 * Probe for all CPUs - this creates the cpumask and sets up the
278 	 * mapping tables.  We need to do this as early as possible.
279 	 */
280 #ifdef CONFIG_SMP
281 	cpu_node_probe();
282 #endif
283 
284 	init_topology_matrix();
285 	dump_topology();
286 
287 	region_mask = gen_region_mask();
288 
289 	setup_replication_mask();
290 
291 	/*
292 	 * Set all nodes' calias sizes to 8k
293 	 */
294 	for_each_online_node(nasid) {
295 		/*
296 		 * Always have node 0 in the region mask, otherwise
297 		 * CALIAS accesses get exceptions since the hub
298 		 * thinks it is a node 0 address.
299 		 */
300 		REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
301 		REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
302 
303 #ifdef LATER
304 		/*
305 		 * Set up all hubs to have a big window pointing at
306 		 * widget 0. Memory mode, widget 0, offset 0
307 		 */
308 		REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
309 			((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
310 			(0 << IIO_ITTE_WIDGET_SHIFT)));
311 #endif
312 	}
313 }
314 
315 static void __init szmem(void)
316 {
317 	unsigned long slot_psize, slot0sz = 0, nodebytes;	/* Hack to detect problem configs */
318 	int slot;
319 	nasid_t node;
320 
321 	for_each_online_node(node) {
322 		nodebytes = 0;
323 		for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
324 			slot_psize = slot_psize_compute(node, slot);
325 			if (slot == 0)
326 				slot0sz = slot_psize;
327 			/*
328 			 * We need to refine the hack when we have replicated
329 			 * kernel text.
330 			 */
331 			nodebytes += (1LL << SLOT_SHIFT);
332 
333 			if (!slot_psize)
334 				continue;
335 
336 			if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
337 						(slot0sz << PAGE_SHIFT)) {
338 				pr_info("Ignoring slot %d onwards on node %d\n",
339 								slot, node);
340 				slot = MAX_MEM_SLOTS;
341 				continue;
342 			}
343 			memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
344 					  PFN_PHYS(slot_psize), node);
345 		}
346 	}
347 }
348 
349 static void __init node_mem_init(nasid_t node)
350 {
351 	unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
352 	unsigned long slot_freepfn = node_getfirstfree(node);
353 	unsigned long start_pfn, end_pfn;
354 
355 	get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
356 
357 	/*
358 	 * Allocate the node data structures on the node first.
359 	 */
360 	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
361 	memset(__node_data[node], 0, PAGE_SIZE);
362 
363 	NODE_DATA(node)->node_start_pfn = start_pfn;
364 	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
365 
366 	cpumask_clear(&hub_data(node)->h_cpus);
367 
368 	slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
369 			       sizeof(struct hub_data));
370 
371 	memblock_reserve(slot_firstpfn << PAGE_SHIFT,
372 			 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
373 }
374 
375 /*
376  * A node with nothing.	 We use it to avoid any special casing in
377  * cpumask_of_node
378  */
379 static struct node_data null_node = {
380 	.hub = {
381 		.h_cpus = CPU_MASK_NONE
382 	}
383 };
384 
385 /*
386  * Currently, the intranode memory hole support assumes that each slot
387  * contains at least 32 MBytes of memory. We assume all bootmem data
388  * fits on the first slot.
389  */
390 void __init prom_meminit(void)
391 {
392 	nasid_t node;
393 
394 	mlreset();
395 	szmem();
396 	max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
397 
398 	for (node = 0; node < MAX_NUMNODES; node++) {
399 		if (node_online(node)) {
400 			node_mem_init(node);
401 			continue;
402 		}
403 		__node_data[node] = &null_node;
404 	}
405 }
406 
407 void __init prom_free_prom_memory(void)
408 {
409 	/* We got nothing to free here ...  */
410 }
411 
412 extern void setup_zero_pages(void);
413 
414 void __init paging_init(void)
415 {
416 	unsigned long zones_size[MAX_NR_ZONES] = {0, };
417 
418 	pagetable_init();
419 	zones_size[ZONE_NORMAL] = max_low_pfn;
420 	free_area_init(zones_size);
421 }
422 
423 void __init mem_init(void)
424 {
425 	high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
426 	memblock_free_all();
427 	setup_zero_pages();	/* This comes from node 0 */
428 	mem_init_print_info(NULL);
429 }
430