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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[deliverable/linux.git] / arch / ia64 / sn / kernel / sn2 / sn_hwperf.c
CommitLineData
1da177e4
LT		 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 *
f478af9d 6 * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
1da177e4
LT		 7 *
8 * SGI Altix topology and hardware performance monitoring API.
9 * Mark Goodwin <markgw@sgi.com>.
10 *
11 * Creates /proc/sgi_sn/sn_topology (read-only) to export
12 * info about Altix nodes, routers, CPUs and NumaLink
13 * interconnection/topology.
14 *
15 * Also creates a dynamic misc device named "sn_hwperf"
16 * that supports an ioctl interface to call down into SAL
17 * to discover hw objects, topology and to read/write
18 * memory mapped registers, e.g. for performance monitoring.
19 * The "sn_hwperf" device is registered only after the procfs
20 * file is first opened, i.e. only if/when it's needed.
21 *
22 * This API is used by SGI Performance Co-Pilot and other
23 * tools, see http://oss.sgi.com/projects/pcp
24 */
25
26#include <linux/fs.h>
27#include <linux/slab.h>
28#include <linux/vmalloc.h>
29#include <linux/seq_file.h>
30#include <linux/miscdevice.h>
4a5c13c7 31#include <linux/utsname.h>
1da177e4
LT		 32#include <linux/cpumask.h>
33#include <linux/smp_lock.h>
34#include <linux/nodemask.h>
a3bc0dbc 35#include <linux/smp.h>
0245583a 36#include <linux/mutex.h>
a3bc0dbc 37
1da177e4
LT		 38#include <asm/processor.h>
39#include <asm/topology.h>
1da177e4
LT		 40#include <asm/uaccess.h>
41#include <asm/sal.h>
42#include <asm/sn/io.h>
43#include <asm/sn/sn_sal.h>
44#include <asm/sn/module.h>
45#include <asm/sn/geo.h>
46#include <asm/sn/sn2/sn_hwperf.h>
4a5c13c7 47#include <asm/sn/addrs.h>
1da177e4
LT		 48
49static void *sn_hwperf_salheap = NULL;
50static int sn_hwperf_obj_cnt = 0;
51static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
52static int sn_hwperf_init(void);
0245583a 53static DEFINE_MUTEX(sn_hwperf_init_mutex);
1da177e4 54
a1d70577
JS		 55#define cnode_possible(n) ((n) < num_cnodes)
56
1da177e4
LT		 57static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
58{
59 int e;
60 u64 sz;
61 struct sn_hwperf_object_info *objbuf = NULL;
62
63 if ((e = sn_hwperf_init()) < 0) {
60a3ba0b 64 printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e);
1da177e4
LT		 65 goto out;
66 }
67
68 sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
1aac0b57
JJ		 69 objbuf = vmalloc(sz);
70 if (objbuf == NULL) {
1da177e4
LT		 71 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
72 e = -ENOMEM;
73 goto out;
74 }
75
76 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
77 0, sz, (u64) objbuf, 0, 0, NULL);
78 if (e != SN_HWPERF_OP_OK) {
79 e = -EINVAL;
80 vfree(objbuf);
81 }
82
83out:
84 *nobj = sn_hwperf_obj_cnt;
85 *ret = objbuf;
86 return e;
87}
88
4a5c13c7
MG		 89static int sn_hwperf_location_to_bpos(char *location,
90 int *rack, int *bay, int *slot, int *slab)
91{
92 char type;
93
94 /* first scan for an old style geoid string */
95 if (sscanf(location, "%03d%c%02d#%d",
96 rack, &type, bay, slab) == 4)
97 *slot = 0;
98 else /* scan for a new bladed geoid string */
99 if (sscanf(location, "%03d%c%02d^%02d#%d",
100 rack, &type, bay, slot, slab) != 5)
101 return -1;
102 /* success */
103 return 0;
104}
105
1da177e4
LT		 106static int sn_hwperf_geoid_to_cnode(char *location)
107{
108 int cnode;
109 geoid_t geoid;
110 moduleid_t module_id;
4a5c13c7
MG		 111 int rack, bay, slot, slab;
112 int this_rack, this_bay, this_slot, this_slab;
1da177e4 113
4a5c13c7 114 if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
1da177e4
LT		 115 return -1;
116
769ebc66
DR		 117 /*
118 * FIXME: replace with cleaner for_each_XXX macro which addresses
119 * both compute and IO nodes once ACPI3.0 is available.
120 */
121 for (cnode = 0; cnode < num_cnodes; cnode++) {
1da177e4
LT		 122 geoid = cnodeid_get_geoid(cnode);
123 module_id = geo_module(geoid);
124 this_rack = MODULE_GET_RACK(module_id);
4a5c13c7 125 this_bay = MODULE_GET_BPOS(module_id);
0985ea8f 126 this_slot = geo_slot(geoid);
1da177e4 127 this_slab = geo_slab(geoid);
4a5c13c7
MG		 128 if (rack == this_rack && bay == this_bay &&
129 slot == this_slot && slab == this_slab) {
1da177e4 130 break;
4a5c13c7 131 }
1da177e4
LT		 132 }
133
a1d70577 134 return cnode_possible(cnode) ? cnode : -1;
1da177e4
LT		 135}
136
137static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
138{
60a3ba0b
MG		 139 if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
140 BUG();
a1d70577 141 if (SN_HWPERF_FOREIGN(obj))
1da177e4
LT		 142 return -1;
143 return sn_hwperf_geoid_to_cnode(obj->location);
144}
145
146static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
147 struct sn_hwperf_object_info *objs)
148{
149 int ordinal;
150 struct sn_hwperf_object_info *p;
151
152 for (ordinal=0, p=objs; p != obj; p++) {
153 if (SN_HWPERF_FOREIGN(p))
154 continue;
155 if (SN_HWPERF_SAME_OBJTYPE(p, obj))
156 ordinal++;
157 }
158
159 return ordinal;
160}
161
162static const char *slabname_node = "node"; /* SHub asic */
163static const char *slabname_ionode = "ionode"; /* TIO asic */
164static const char *slabname_router = "router"; /* NL3R or NL4R */
165static const char *slabname_other = "other"; /* unknown asic */
166
167static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj,
168 struct sn_hwperf_object_info *objs, int *ordinal)
169{
170 int isnode;
171 const char *slabname = slabname_other;
172
173 if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) {
174 slabname = isnode ? slabname_node : slabname_ionode;
175 *ordinal = sn_hwperf_obj_to_cnode(obj);
176 }
177 else {
178 *ordinal = sn_hwperf_generic_ordinal(obj, objs);
179 if (SN_HWPERF_IS_ROUTER(obj))
180 slabname = slabname_router;
181 }
182
183 return slabname;
184}
185
ecc3c30a 186static void print_pci_topology(struct seq_file *s)
4a5c13c7 187{
ecc3c30a
MG		 188 char *p;
189 size_t sz;
190 int e;
191
192 for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
5cbded58 193 if (!(p = kmalloc(sz, GFP_KERNEL)))
ecc3c30a
MG		 194 break;
195 e = ia64_sn_ioif_get_pci_topology(__pa(p), sz);
196 if (e == SALRET_OK)
197 seq_puts(s, p);
198 kfree(p);
199 if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED)
200 break;
4a5c13c7
MG		 201 }
202}
203
60a3ba0b
MG		 204static inline int sn_hwperf_has_cpus(cnodeid_t node)
205{
a1d70577 206 return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node);
60a3ba0b
MG		 207}
208
209static inline int sn_hwperf_has_mem(cnodeid_t node)
210{
a1d70577 211 return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages;
60a3ba0b
MG		 212}
213
214static struct sn_hwperf_object_info *
215sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf,
216 int nobj, int id)
4a5c13c7 217{
60a3ba0b
MG		 218 int i;
219 struct sn_hwperf_object_info *p = objbuf;
220
221 for (i=0; i < nobj; i++, p++) {
222 if (p->id == id)
223 return p;
224 }
225
226 return NULL;
227
228}
229
230static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf,
231 int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
232{
233 int e;
234 struct sn_hwperf_object_info *nodeobj = NULL;
235 struct sn_hwperf_object_info *op;
236 struct sn_hwperf_object_info *dest;
237 struct sn_hwperf_object_info *router;
238 struct sn_hwperf_port_info ptdata[16];
239 int sz, i, j;
240 cnodeid_t c;
241 int found_mem = 0;
242 int found_cpu = 0;
243
a1d70577 244 if (!cnode_possible(node))
60a3ba0b
MG		 245 return -EINVAL;
246
247 if (sn_hwperf_has_cpus(node)) {
248 if (near_cpu_node)
249 *near_cpu_node = node;
250 found_cpu++;
251 }
252
253 if (sn_hwperf_has_mem(node)) {
254 if (near_mem_node)
255 *near_mem_node = node;
256 found_mem++;
257 }
258
259 if (found_cpu && found_mem)
260 return 0; /* trivially successful */
261
262 /* find the argument node object */
263 for (i=0, op=objbuf; i < nobj; i++, op++) {
264 if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op))
265 continue;
266 if (node == sn_hwperf_obj_to_cnode(op)) {
267 nodeobj = op;
268 break;
269 }
270 }
271 if (!nodeobj) {
272 e = -ENOENT;
273 goto err;
274 }
275
276 /* get it's interconnect topology */
277 sz = op->ports * sizeof(struct sn_hwperf_port_info);
80a03e29 278 BUG_ON(sz > sizeof(ptdata));
60a3ba0b
MG		 279 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
280 SN_HWPERF_ENUM_PORTS, nodeobj->id, sz,
281 (u64)&ptdata, 0, 0, NULL);
282 if (e != SN_HWPERF_OP_OK) {
283 e = -EINVAL;
284 goto err;
285 }
286
287 /* find nearest node with cpus and nearest memory */
288 for (router=NULL, j=0; j < op->ports; j++) {
289 dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id);
f0fe253c
JS		 290 if (dest && SN_HWPERF_IS_ROUTER(dest))
291 router = dest;
60a3ba0b
MG		 292 if (!dest || SN_HWPERF_FOREIGN(dest) ||
293 !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) {
294 continue;
295 }
296 c = sn_hwperf_obj_to_cnode(dest);
297 if (!found_cpu && sn_hwperf_has_cpus(c)) {
298 if (near_cpu_node)
299 *near_cpu_node = c;
300 found_cpu++;
301 }
302 if (!found_mem && sn_hwperf_has_mem(c)) {
303 if (near_mem_node)
304 *near_mem_node = c;
305 found_mem++;
306 }
60a3ba0b
MG		 307 }
308
309 if (router && (!found_cpu || !found_mem)) {
310 /* search for a node connected to the same router */
311 sz = router->ports * sizeof(struct sn_hwperf_port_info);
80a03e29 312 BUG_ON(sz > sizeof(ptdata));
60a3ba0b
MG		 313 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
314 SN_HWPERF_ENUM_PORTS, router->id, sz,
315 (u64)&ptdata, 0, 0, NULL);
316 if (e != SN_HWPERF_OP_OK) {
317 e = -EINVAL;
318 goto err;
319 }
320 for (j=0; j < router->ports; j++) {
321 dest = sn_hwperf_findobj_id(objbuf, nobj,
322 ptdata[j].conn_id);
323 if (!dest || dest->id == node ||
324 SN_HWPERF_FOREIGN(dest) ||
325 !SN_HWPERF_IS_NODE(dest) ||
326 SN_HWPERF_IS_IONODE(dest)) {
327 continue;
328 }
329 c = sn_hwperf_obj_to_cnode(dest);
330 if (!found_cpu && sn_hwperf_has_cpus(c)) {
331 if (near_cpu_node)
332 *near_cpu_node = c;
333 found_cpu++;
334 }
335 if (!found_mem && sn_hwperf_has_mem(c)) {
336 if (near_mem_node)
337 *near_mem_node = c;
338 found_mem++;
339 }
340 if (found_cpu && found_mem)
341 break;
342 }
343 }
344
345 if (!found_cpu || !found_mem) {
346 /* resort to _any_ node with CPUs and memory */
347 for (i=0, op=objbuf; i < nobj; i++, op++) {
348 if (SN_HWPERF_FOREIGN(op) ||
349 SN_HWPERF_IS_IONODE(op) ||
350 !SN_HWPERF_IS_NODE(op)) {
351 continue;
352 }
353 c = sn_hwperf_obj_to_cnode(op);
354 if (!found_cpu && sn_hwperf_has_cpus(c)) {
355 if (near_cpu_node)
356 *near_cpu_node = c;
357 found_cpu++;
358 }
359 if (!found_mem && sn_hwperf_has_mem(c)) {
360 if (near_mem_node)
361 *near_mem_node = c;
362 found_mem++;
363 }
364 if (found_cpu && found_mem)
0985ea8f 365 break;
0985ea8f 366 }
4a5c13c7 367 }
60a3ba0b
MG		 368
369 if (!found_cpu || !found_mem)
370 e = -ENODATA;
371
372err:
373 return e;
4a5c13c7
MG		 374}
375
60a3ba0b 376
1da177e4
LT		 377static int sn_topology_show(struct seq_file *s, void *d)
378{
379 int sz;
380 int pt;
4a5c13c7 381 int e = 0;
1da177e4
LT		 382 int i;
383 int j;
384 const char *slabname;
385 int ordinal;
1da177e4
LT		 386 char slice;
387 struct cpuinfo_ia64 *c;
388 struct sn_hwperf_port_info *ptdata;
389 struct sn_hwperf_object_info *p;
390 struct sn_hwperf_object_info *obj = d; /* this object */
391 struct sn_hwperf_object_info *objs = s->private; /* all objects */
4a5c13c7
MG		 392 u8 shubtype;
393 u8 system_size;
394 u8 sharing_size;
395 u8 partid;
396 u8 coher;
397 u8 nasid_shift;
398 u8 region_size;
399 u16 nasid_mask;
400 int nasid_msb;
1da177e4
LT		 401
402 if (obj == objs) {
4a5c13c7 403 seq_printf(s, "# sn_topology version 2\n");
1da177e4
LT		 404 seq_printf(s, "# objtype ordinal location partition"
405 " [attribute value [, ...]]\n");
4a5c13c7
MG		 406
407 if (ia64_sn_get_sn_info(0,
408 &shubtype, &nasid_mask, &nasid_shift, &system_size,
409 &sharing_size, &partid, &coher, &region_size))
410 BUG();
411 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
412 if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
413 break;
414 }
415 seq_printf(s, "partition %u %s local "
416 "shubtype %s, "
417 "nasid_mask 0x%016lx, "
418 "nasid_bits %d:%d, "
419 "system_size %d, "
420 "sharing_size %d, "
421 "coherency_domain %d, "
422 "region_size %d\n",
423
e9ff3990 424 partid, utsname()->nodename,
4a5c13c7
MG		 425 shubtype ? "shub2" : "shub1",
426 (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
427 system_size, sharing_size, coher, region_size);
ecc3c30a
MG		 428
429 print_pci_topology(s);
1da177e4
LT		 430 }
431
432 if (SN_HWPERF_FOREIGN(obj)) {
433 /* private in another partition: not interesting */
434 return 0;
435 }
436
4a5c13c7 437 for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
1da177e4
LT		 438 if (obj->name[i] == ' ')
439 obj->name[i] = '_';
440 }
441
442 slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
443 seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
444 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
445
a1d70577 446 if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)))
1da177e4
LT		 447 seq_putc(s, '\n');
448 else {
60a3ba0b
MG		 449 cnodeid_t near_mem = -1;
450 cnodeid_t near_cpu = -1;
451
1da177e4 452 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
60a3ba0b
MG		 453
454 if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt,
455 ordinal, &near_mem, &near_cpu) == 0) {
456 seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d",
457 near_mem, near_cpu);
458 }
459
460 if (!SN_HWPERF_IS_IONODE(obj)) {
461 for_each_online_node(i) {
462 seq_printf(s, i ? ":%d" : ", dist %d",
463 node_distance(ordinal, i));
464 }
1da177e4 465 }
60a3ba0b 466
1da177e4
LT		 467 seq_putc(s, '\n');
468
469 /*
470 * CPUs on this node, if any
471 */
a1d70577 472 if (!SN_HWPERF_IS_IONODE(obj)) {
fbb776c3
RR		 473 for_each_cpu_and(i, cpu_online_mask,
474 cpumask_of_node(ordinal)) {
475 slice = 'a' + cpuid_to_slice(i);
476 c = cpu_data(i);
477 seq_printf(s, "cpu %d %s%c local"
478 " freq %luMHz, arch ia64",
479 i, obj->location, slice,
480 c->proc_freq / 1000000);
481 for_each_online_cpu(j) {
482 seq_printf(s, j ? ":%d" : ", dist %d",
483 node_distance(
a1d70577
JS		 484 cpu_to_node(i),
485 cpu_to_node(j)));
1da177e4 486 }
fbb776c3 487 seq_putc(s, '\n');
1da177e4
LT		 488 }
489 }
490 }
491
492 if (obj->ports) {
493 /*
494 * numalink ports
495 */
496 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
dd4cb9f8 497 if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
1da177e4
LT		 498 return -ENOMEM;
499 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
500 SN_HWPERF_ENUM_PORTS, obj->id, sz,
501 (u64) ptdata, 0, 0, NULL);
502 if (e != SN_HWPERF_OP_OK)
503 return -EINVAL;
504 for (ordinal=0, p=objs; p != obj; p++) {
505 if (!SN_HWPERF_FOREIGN(p))
506 ordinal += p->ports;
507 }
508 for (pt = 0; pt < obj->ports; pt++) {
509 for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
510 if (ptdata[pt].conn_id == p->id) {
511 break;
512 }
513 }
514 seq_printf(s, "numalink %d %s-%d",
515 ordinal+pt, obj->location, ptdata[pt].port);
516
517 if (i >= sn_hwperf_obj_cnt) {
518 /* no connection */
519 seq_puts(s, " local endpoint disconnected"
520 ", protocol unknown\n");
521 continue;
522 }
523
524 if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
525 /* both ends local to this partition */
526 seq_puts(s, " local");
a1d70577 527 else if (SN_HWPERF_FOREIGN(p))
1da177e4
LT		 528 /* both ends of the link in foreign partiton */
529 seq_puts(s, " foreign");
530 else
531 /* link straddles a partition */
532 seq_puts(s, " shared");
533
534 /*
535 * Unlikely, but strictly should query the LLP config
536 * registers because an NL4R can be configured to run
537 * NL3 protocol, even when not talking to an NL3 router.
538 * Ditto for node-node.
539 */
540 seq_printf(s, " endpoint %s-%d, protocol %s\n",
541 p->location, ptdata[pt].conn_port,
542 (SN_HWPERF_IS_NL3ROUTER(obj) ||
543 SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4");
544 }
dd4cb9f8 545 kfree(ptdata);
1da177e4
LT		 546 }
547
548 return 0;
549}
550
551static void *sn_topology_start(struct seq_file *s, loff_t * pos)
552{
553 struct sn_hwperf_object_info *objs = s->private;
554
555 if (*pos < sn_hwperf_obj_cnt)
556 return (void *)(objs + *pos);
557
558 return NULL;
559}
560
561static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
562{
563 ++*pos;
564 return sn_topology_start(s, pos);
565}
566
567static void sn_topology_stop(struct seq_file *m, void *v)
568{
569 return;
570}
571
572/*
573 * /proc/sgi_sn/sn_topology, read-only using seq_file
574 */
a23fe55e 575static const struct seq_operations sn_topology_seq_ops = {
1da177e4
LT		 576 .start = sn_topology_start,
577 .next = sn_topology_next,
578 .stop = sn_topology_stop,
579 .show = sn_topology_show
580};
581
582struct sn_hwperf_op_info {
583 u64 op;
584 struct sn_hwperf_ioctl_args *a;
585 void *p;
586 int *v0;
587 int ret;
588};
589
590static void sn_hwperf_call_sal(void *info)
591{
592 struct sn_hwperf_op_info *op_info = info;
593 int r;
594
595 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
596 op_info->a->arg, op_info->a->sz,
597 (u64) op_info->p, 0, 0, op_info->v0);
598 op_info->ret = r;
599}
600
601static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
602{
603 u32 cpu;
604 u32 use_ipi;
605 int r = 0;
606 cpumask_t save_allowed;
607
608 cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
609 use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
610 op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
611
612 if (cpu != SN_HWPERF_ARG_ANY_CPU) {
5dd3c994 613 if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
1da177e4
LT		 614 r = -EINVAL;
615 goto out;
616 }
617 }
618
619 if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
620 /* don't care, or already on correct cpu */
621 sn_hwperf_call_sal(op_info);
622 }
623 else {
624 if (use_ipi) {
625 /* use an interprocessor interrupt to call SAL */
626 smp_call_function_single(cpu, sn_hwperf_call_sal,
8691e5a8 627 op_info, 1);
1da177e4
LT		 628 }
629 else {
630 /* migrate the task before calling SAL */
631 save_allowed = current->cpus_allowed;
632 set_cpus_allowed(current, cpumask_of_cpu(cpu));
633 sn_hwperf_call_sal(op_info);
634 set_cpus_allowed(current, save_allowed);
635 }
636 }
637 r = op_info->ret;
638
639out:
640 return r;
641}
642
643/* map SAL hwperf error code to system error code */
644static int sn_hwperf_map_err(int hwperf_err)
645{
646 int e;
647
648 switch(hwperf_err) {
649 case SN_HWPERF_OP_OK:
650 e = 0;
651 break;
652
653 case SN_HWPERF_OP_NOMEM:
654 e = -ENOMEM;
655 break;
656
657 case SN_HWPERF_OP_NO_PERM:
658 e = -EPERM;
659 break;
660
661 case SN_HWPERF_OP_IO_ERROR:
662 e = -EIO;
663 break;
664
665 case SN_HWPERF_OP_BUSY:
4a5c13c7
MG		 666 e = -EBUSY;
667 break;
668
1da177e4
LT		 669 case SN_HWPERF_OP_RECONFIGURE:
670 e = -EAGAIN;
671 break;
672
673 case SN_HWPERF_OP_INVAL:
674 default:
675 e = -EINVAL;
676 break;
677 }
678
679 return e;
680}
681
682/*
683 * ioctl for "sn_hwperf" misc device
684 */
685static int
686sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
687{
688 struct sn_hwperf_ioctl_args a;
689 struct cpuinfo_ia64 *cdata;
690 struct sn_hwperf_object_info *objs;
691 struct sn_hwperf_object_info *cpuobj;
692 struct sn_hwperf_op_info op_info;
693 void *p = NULL;
694 int nobj;
695 char slice;
696 int node;
697 int r;
698 int v0;
699 int i;
700 int j;
701
702 unlock_kernel();
703
704 /* only user requests are allowed here */
705 if ((op & SN_HWPERF_OP_MASK) < 10) {
706 r = -EINVAL;
707 goto error;
708 }
709 r = copy_from_user(&a, (const void __user *)arg,
710 sizeof(struct sn_hwperf_ioctl_args));
711 if (r != 0) {
712 r = -EFAULT;
713 goto error;
714 }
715
716 /*
717 * Allocate memory to hold a kernel copy of the user buffer. The
718 * buffer contents are either copied in or out (or both) of user
719 * space depending on the flags encoded in the requested operation.
720 */
721 if (a.ptr) {
722 p = vmalloc(a.sz);
723 if (!p) {
724 r = -ENOMEM;
725 goto error;
726 }
727 }
728
729 if (op & SN_HWPERF_OP_MEM_COPYIN) {
730 r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
731 if (r != 0) {
732 r = -EFAULT;
733 goto error;
734 }
735 }
736
737 switch (op) {
738 case SN_HWPERF_GET_CPU_INFO:
739 if (a.sz == sizeof(u64)) {
740 /* special case to get size needed */
741 *(u64 *) p = (u64) num_online_cpus() *
742 sizeof(struct sn_hwperf_object_info);
743 } else
744 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
745 r = -ENOMEM;
746 goto error;
747 } else
748 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
83e12a07
MG		 749 int cpuobj_index = 0;
750
1da177e4
LT		 751 memset(p, 0, a.sz);
752 for (i = 0; i < nobj; i++) {
60a3ba0b
MG		 753 if (!SN_HWPERF_IS_NODE(objs + i))
754 continue;
1da177e4
LT		 755 node = sn_hwperf_obj_to_cnode(objs + i);
756 for_each_online_cpu(j) {
757 if (node != cpu_to_node(j))
758 continue;
090de0b7 759 cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++;
1da177e4
LT		 760 slice = 'a' + cpuid_to_slice(j);
761 cdata = cpu_data(j);
762 cpuobj->id = j;
763 snprintf(cpuobj->name,
764 sizeof(cpuobj->name),
765 "CPU %luMHz %s",
766 cdata->proc_freq / 1000000,
767 cdata->vendor);
768 snprintf(cpuobj->location,
769 sizeof(cpuobj->location),
770 "%s%c", objs[i].location,
771 slice);
772 }
773 }
774
775 vfree(objs);
776 }
777 break;
778
779 case SN_HWPERF_GET_NODE_NASID:
780 if (a.sz != sizeof(u64) ||
a1d70577 781 (node = a.arg) < 0 || !cnode_possible(node)) {
1da177e4
LT		 782 r = -EINVAL;
783 goto error;
784 }
785 *(u64 *)p = (u64)cnodeid_to_nasid(node);
786 break;
787
788 case SN_HWPERF_GET_OBJ_NODE:
789 if (a.sz != sizeof(u64) || a.arg < 0) {
790 r = -EINVAL;
791 goto error;
792 }
793 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
794 if (a.arg >= nobj) {
795 r = -EINVAL;
796 vfree(objs);
797 goto error;
798 }
799 if (objs[(i = a.arg)].id != a.arg) {
800 for (i = 0; i < nobj; i++) {
801 if (objs[i].id == a.arg)
802 break;
803 }
804 }
805 if (i == nobj) {
806 r = -EINVAL;
807 vfree(objs);
808 goto error;
809 }
60a3ba0b
MG		 810
811 if (!SN_HWPERF_IS_NODE(objs + i) &&
812 !SN_HWPERF_IS_IONODE(objs + i)) {
813 r = -ENOENT;
814 vfree(objs);
815 goto error;
816 }
817
1da177e4
LT		 818 *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
819 vfree(objs);
820 }
821 break;
822
823 case SN_HWPERF_GET_MMRS:
824 case SN_HWPERF_SET_MMRS:
825 case SN_HWPERF_OBJECT_DISTANCE:
826 op_info.p = p;
827 op_info.a = &a;
828 op_info.v0 = &v0;
829 op_info.op = op;
830 r = sn_hwperf_op_cpu(&op_info);
831 if (r) {
832 r = sn_hwperf_map_err(r);
4a5c13c7 833 a.v0 = v0;
1da177e4
LT		 834 goto error;
835 }
836 break;
837
838 default:
839 /* all other ops are a direct SAL call */
840 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
841 a.arg, a.sz, (u64) p, 0, 0, &v0);
842 if (r) {
843 r = sn_hwperf_map_err(r);
844 goto error;
845 }
846 a.v0 = v0;
847 break;
848 }
849
850 if (op & SN_HWPERF_OP_MEM_COPYOUT) {
851 r = copy_to_user((void __user *)a.ptr, p, a.sz);
852 if (r != 0) {
853 r = -EFAULT;
854 goto error;
855 }
856 }
857
858error:
859 vfree(p);
860
861 lock_kernel();
862 return r;
863}
864
5dfe4c96 865static const struct file_operations sn_hwperf_fops = {
1da177e4
LT		 866 .ioctl = sn_hwperf_ioctl,
867};
868
869static struct miscdevice sn_hwperf_dev = {
870 MISC_DYNAMIC_MINOR,
871 "sn_hwperf",
872 &sn_hwperf_fops
873};
874
875static int sn_hwperf_init(void)
876{
877 u64 v;
878 int salr;
879 int e = 0;
880
881 /* single threaded, once-only initialization */
0245583a 882 mutex_lock(&sn_hwperf_init_mutex);
60a3ba0b 883
1da177e4 884 if (sn_hwperf_salheap) {
0245583a 885 mutex_unlock(&sn_hwperf_init_mutex);
1da177e4
LT		 886 return e;
887 }
888
889 /*
890 * The PROM code needs a fixed reference node. For convenience the
891 * same node as the console I/O is used.
892 */
893 sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
894
895 /*
896 * Request the needed size and install the PROM scratch area.
897 * The PROM keeps various tracking bits in this memory area.
898 */
899 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
900 (u64) SN_HWPERF_GET_HEAPSIZE, 0,
901 (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
902 if (salr != SN_HWPERF_OP_OK) {
903 e = -EINVAL;
904 goto out;
905 }
906
907 if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
908 e = -ENOMEM;
909 goto out;
910 }
911 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
912 SN_HWPERF_INSTALL_HEAP, 0, v,
913 (u64) sn_hwperf_salheap, 0, 0, NULL);
914 if (salr != SN_HWPERF_OP_OK) {
915 e = -EINVAL;
916 goto out;
917 }
918
919 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
920 SN_HWPERF_OBJECT_COUNT, 0,
921 sizeof(u64), (u64) &v, 0, 0, NULL);
922 if (salr != SN_HWPERF_OP_OK) {
923 e = -EINVAL;
924 goto out;
925 }
926 sn_hwperf_obj_cnt = (int)v;
927
928out:
929 if (e < 0 && sn_hwperf_salheap) {
930 vfree(sn_hwperf_salheap);
931 sn_hwperf_salheap = NULL;
932 sn_hwperf_obj_cnt = 0;
933 }
0245583a 934 mutex_unlock(&sn_hwperf_init_mutex);
1da177e4
LT		 935 return e;
936}
937
938int sn_topology_open(struct inode *inode, struct file *file)
939{
940 int e;
941 struct seq_file *seq;
942 struct sn_hwperf_object_info *objbuf;
943 int nobj;
944
945 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
946 e = seq_open(file, &sn_topology_seq_ops);
947 seq = file->private_data;
948 seq->private = objbuf;
949 }
950
951 return e;
952}
953
954int sn_topology_release(struct inode *inode, struct file *file)
955{
956 struct seq_file *seq = file->private_data;
957
958 vfree(seq->private);
959 return seq_release(inode, file);
960}
60a3ba0b
MG		 961
962int sn_hwperf_get_nearest_node(cnodeid_t node,
963 cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
964{
965 int e;
966 int nobj;
967 struct sn_hwperf_object_info *objbuf;
968
969 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
970 e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj,
971 node, near_mem_node, near_cpu_node);
972 vfree(objbuf);
973 }
974
975 return e;
976}
977
978static int __devinit sn_hwperf_misc_register_init(void)
979{
980 int e;
981
f478af9d
JS		 982 if (!ia64_platform_is("sn2"))
983 return 0;
984
60a3ba0b
MG		 985 sn_hwperf_init();
986
987 /*
988 * Register a dynamic misc device for hwperf ioctls. Platforms
989 * supporting hotplug will create /dev/sn_hwperf, else user
990 * can to look up the minor number in /proc/misc.
991 */
992 if ((e = misc_register(&sn_hwperf_dev)) != 0) {
993 printk(KERN_ERR "sn_hwperf_misc_register_init: failed to "
994 "register misc device for \"%s\"\n", sn_hwperf_dev.name);
995 }
996
997 return e;
998}
999
1000device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */
1001EXPORT_SYMBOL(sn_hwperf_get_nearest_node);
Linux kernel - Deliverables
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