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

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  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/memblock.h>
 16 #include <linux/mm.h>
 17 #include <linux/mmzone.h>
 18 #include <linux/module.h>
 19 #include <linux/nodemask.h>
 20 #include <linux/swap.h>
 21 #include <linux/bootmem.h>
 22 #include <linux/pfn.h>
 23 #include <linux/highmem.h>
 24 #include <asm/page.h>
 25 #include <asm/pgalloc.h>
 26 #include <asm/sections.h>
 27 
 28 #include <asm/sn/arch.h>
 29 #include <asm/sn/hub.h>
 30 #include <asm/sn/klconfig.h>
 31 #include <asm/sn/sn_private.h>
 32 
 33 
 34 #define SLOT_PFNSHIFT           (SLOT_SHIFT - PAGE_SHIFT)
 35 #define PFN_NASIDSHFT           (NASID_SHFT - PAGE_SHIFT)
 36 
 37 struct node_data *__node_data[MAX_COMPACT_NODES];
 38 
 39 EXPORT_SYMBOL(__node_data);
 40 
 41 static int fine_mode;
 42 
 43 static int is_fine_dirmode(void)
 44 {
 45         return ((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_REGIONSIZE_MASK) >> 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 EXPORT_SYMBOL(__node_distances);
110 
111 static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
112 {
113         klrou_t *router, *router_a = NULL, *router_b = NULL;
114         lboard_t *brd, *dest_brd;
115         cnodeid_t cnode;
116         nasid_t nasid;
117         int port;
118 
119         /* Figure out which routers nodes in question are connected to */
120         for_each_online_node(cnode) {
121                 nasid = COMPACT_TO_NASID_NODEID(cnode);
122 
123                 if (nasid == -1) continue;
124 
125                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
126                                         KLTYPE_ROUTER);
127 
128                 if (!brd)
129                         continue;
130 
131                 do {
132                         if (brd->brd_flags & DUPLICATE_BOARD)
133                                 continue;
134 
135                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
136                         router->rou_rflag = 0;
137 
138                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
139                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
140                                         continue;
141 
142                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
143                                         router->rou_port[port].port_nasid,
144                                         router->rou_port[port].port_offset);
145 
146                                 if (dest_brd->brd_type == KLTYPE_IP27) {
147                                         if (dest_brd->brd_nasid == nasid_a)
148                                                 router_a = router;
149                                         if (dest_brd->brd_nasid == nasid_b)
150                                                 router_b = router;
151                                 }
152                         }
153 
154                 } while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
155         }
156 
157         if (router_a == NULL) {
158                 printk("node_distance: router_a NULL\n");
159                 return -1;
160         }
161         if (router_b == NULL) {
162                 printk("node_distance: router_b NULL\n");
163                 return -1;
164         }
165 
166         if (nasid_a == nasid_b)
167                 return 0;
168 
169         if (router_a == router_b)
170                 return 1;
171 
172         router_distance = 100;
173         router_recurse(router_a, router_b, 2);
174 
175         return router_distance;
176 }
177 
178 static void __init init_topology_matrix(void)
179 {
180         nasid_t nasid, nasid2;
181         cnodeid_t row, col;
182 
183         for (row = 0; row < MAX_COMPACT_NODES; row++)
184                 for (col = 0; col < MAX_COMPACT_NODES; col++)
185                         __node_distances[row][col] = -1;
186 
187         for_each_online_node(row) {
188                 nasid = COMPACT_TO_NASID_NODEID(row);
189                 for_each_online_node(col) {
190                         nasid2 = COMPACT_TO_NASID_NODEID(col);
191                         __node_distances[row][col] =
192                                 compute_node_distance(nasid, nasid2);
193                 }
194         }
195 }
196 
197 static void __init dump_topology(void)
198 {
199         nasid_t nasid;
200         cnodeid_t cnode;
201         lboard_t *brd, *dest_brd;
202         int port;
203         int router_num = 0;
204         klrou_t *router;
205         cnodeid_t row, col;
206 
207         printk("************** Topology ********************\n");
208 
209         printk("    ");
210         for_each_online_node(col)
211                 printk("%02d ", col);
212         printk("\n");
213         for_each_online_node(row) {
214                 printk("%02d  ", row);
215                 for_each_online_node(col)
216                         printk("%2d ", node_distance(row, col));
217                 printk("\n");
218         }
219 
220         for_each_online_node(cnode) {
221                 nasid = COMPACT_TO_NASID_NODEID(cnode);
222 
223                 if (nasid == -1) continue;
224 
225                 brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
226                                         KLTYPE_ROUTER);
227 
228                 if (!brd)
229                         continue;
230 
231                 do {
232                         if (brd->brd_flags & DUPLICATE_BOARD)
233                                 continue;
234                         printk("Router %d:", router_num);
235                         router_num++;
236 
237                         router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
238 
239                         for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
240                                 if (router->rou_port[port].port_nasid == INVALID_NASID)
241                                         continue;
242 
243                                 dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
244                                         router->rou_port[port].port_nasid,
245                                         router->rou_port[port].port_offset);
246 
247                                 if (dest_brd->brd_type == KLTYPE_IP27)
248                                         printk(" %d", dest_brd->brd_nasid);
249                                 if (dest_brd->brd_type == KLTYPE_ROUTER)
250                                         printk(" r");
251                         }
252                         printk("\n");
253 
254                 } while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
255         }
256 }
257 
258 static unsigned long __init slot_getbasepfn(cnodeid_t cnode, int slot)
259 {
260         nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
261 
262         return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
263 }
264 
265 static unsigned long __init slot_psize_compute(cnodeid_t node, int slot)
266 {
267         nasid_t nasid;
268         lboard_t *brd;
269         klmembnk_t *banks;
270         unsigned long size;
271 
272         nasid = COMPACT_TO_NASID_NODEID(node);
273         /* Find the node board */
274         brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
275         if (!brd)
276                 return 0;
277 
278         /* Get the memory bank structure */
279         banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
280         if (!banks)
281                 return 0;
282 
283         /* Size in _Megabytes_ */
284         size = (unsigned long)banks->membnk_bnksz[slot/4];
285 
286         /* hack for 128 dimm banks */
287         if (size <= 128) {
288                 if (slot % 4 == 0) {
289                         size <<= 20;            /* size in bytes */
290                         return size >> PAGE_SHIFT;
291                 } else
292                         return 0;
293         } else {
294                 size /= 4;
295                 size <<= 20;
296                 return size >> PAGE_SHIFT;
297         }
298 }
299 
300 static void __init mlreset(void)
301 {
302         int i;
303 
304         master_nasid = get_nasid();
305         fine_mode = is_fine_dirmode();
306 
307         /*
308          * Probe for all CPUs - this creates the cpumask and sets up the
309          * mapping tables.  We need to do this as early as possible.
310          */
311 #ifdef CONFIG_SMP
312         cpu_node_probe();
313 #endif
314 
315         init_topology_matrix();
316         dump_topology();
317 
318         gen_region_mask(&region_mask);
319 
320         setup_replication_mask();
321 
322         /*
323          * Set all nodes' calias sizes to 8k
324          */
325         for_each_online_node(i) {
326                 nasid_t nasid;
327 
328                 nasid = COMPACT_TO_NASID_NODEID(i);
329 
330                 /*
331                  * Always have node 0 in the region mask, otherwise
332                  * CALIAS accesses get exceptions since the hub
333                  * thinks it is a node 0 address.
334                  */
335                 REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
336 #ifdef CONFIG_REPLICATE_EXHANDLERS
337                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
338 #else
339                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
340 #endif
341 
342 #ifdef LATER
343                 /*
344                  * Set up all hubs to have a big window pointing at
345                  * widget 0. Memory mode, widget 0, offset 0
346                  */
347                 REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
348                         ((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
349                         (0 << IIO_ITTE_WIDGET_SHIFT)));
350 #endif
351         }
352 }
353 
354 static void __init szmem(void)
355 {
356         unsigned long slot_psize, slot0sz = 0, nodebytes;       /* Hack to detect problem configs */
357         int slot;
358         cnodeid_t node;
359 
360         for_each_online_node(node) {
361                 nodebytes = 0;
362                 for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
363                         slot_psize = slot_psize_compute(node, slot);
364                         if (slot == 0)
365                                 slot0sz = slot_psize;
366                         /*
367                          * We need to refine the hack when we have replicated
368                          * kernel text.
369                          */
370                         nodebytes += (1LL << SLOT_SHIFT);
371 
372                         if (!slot_psize)
373                                 continue;
374 
375                         if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
376                                                 (slot0sz << PAGE_SHIFT)) {
377                                 printk("Ignoring slot %d onwards on node %d\n",
378                                                                 slot, node);
379                                 slot = MAX_MEM_SLOTS;
380                                 continue;
381                         }
382                         memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
383                                           PFN_PHYS(slot_psize), node);
384                 }
385         }
386 }
387 
388 static void __init node_mem_init(cnodeid_t node)
389 {
390         unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
391         unsigned long slot_freepfn = node_getfirstfree(node);
392         unsigned long bootmap_size;
393         unsigned long start_pfn, end_pfn;
394 
395         get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
396 
397         /*
398          * Allocate the node data structures on the node first.
399          */
400         __node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
401         memset(__node_data[node], 0, PAGE_SIZE);
402 
403         NODE_DATA(node)->bdata = &bootmem_node_data[node];
404         NODE_DATA(node)->node_start_pfn = start_pfn;
405         NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
406 
407         cpumask_clear(&hub_data(node)->h_cpus);
408 
409         slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
410                                sizeof(struct hub_data));
411 
412         bootmap_size = init_bootmem_node(NODE_DATA(node), slot_freepfn,
413                                         start_pfn, end_pfn);
414         free_bootmem_with_active_regions(node, end_pfn);
415         reserve_bootmem_node(NODE_DATA(node), slot_firstpfn << PAGE_SHIFT,
416                 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT) + bootmap_size,
417                 BOOTMEM_DEFAULT);
418         sparse_memory_present_with_active_regions(node);
419 }
420 
421 /*
422  * A node with nothing.  We use it to avoid any special casing in
423  * cpumask_of_node
424  */
425 static struct node_data null_node = {
426         .hub = {
427                 .h_cpus = CPU_MASK_NONE
428         }
429 };
430 
431 /*
432  * Currently, the intranode memory hole support assumes that each slot
433  * contains at least 32 MBytes of memory. We assume all bootmem data
434  * fits on the first slot.
435  */
436 void __init prom_meminit(void)
437 {
438         cnodeid_t node;
439 
440         mlreset();
441         szmem();
442 
443         for (node = 0; node < MAX_COMPACT_NODES; node++) {
444                 if (node_online(node)) {
445                         node_mem_init(node);
446                         continue;
447                 }
448                 __node_data[node] = &null_node;
449         }
450 }
451 
452 void __init prom_free_prom_memory(void)
453 {
454         /* We got nothing to free here ...  */
455 }
456 
457 extern void setup_zero_pages(void);
458 
459 void __init paging_init(void)
460 {
461         unsigned long zones_size[MAX_NR_ZONES] = {0, };
462         unsigned node;
463 
464         pagetable_init();
465 
466         for_each_online_node(node) {
467                 unsigned long start_pfn, end_pfn;
468 
469                 get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
470 
471                 if (end_pfn > max_low_pfn)
472                         max_low_pfn = end_pfn;
473         }
474         zones_size[ZONE_NORMAL] = max_low_pfn;
475         free_area_init_nodes(zones_size);
476 }
477 
478 void __init mem_init(void)
479 {
480         high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
481         free_all_bootmem();
482         setup_zero_pages();     /* This comes from node 0 */
483         mem_init_print_info(NULL);
484 }
485 

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