← Back to branch summary

~ubuntu-branches/ubuntu/precise/linux-lowlatency/precise

« back to all changes in this revision

Viewing changes to arch/ia64/sn/kernel/sn2/sn_hwperf.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

Show diffs side-by-side

added added

removed removed

Lines of Context:
arch/ia64/sn/kernel/sn2/sn_hwperf.c
 
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) 2004-2006 Silicon Graphics, Inc. All rights reserved.
 
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>
 
31
#include <linux/utsname.h>
 
32
#include <linux/cpumask.h>
 
33
#include <linux/nodemask.h>
 
34
#include <linux/smp.h>
 
35
#include <linux/mutex.h>
 
36
 
 
37
#include <asm/processor.h>
 
38
#include <asm/topology.h>
 
39
#include <asm/uaccess.h>
 
40
#include <asm/sal.h>
 
41
#include <asm/sn/io.h>
 
42
#include <asm/sn/sn_sal.h>
 
43
#include <asm/sn/module.h>
 
44
#include <asm/sn/geo.h>
 
45
#include <asm/sn/sn2/sn_hwperf.h>
 
46
#include <asm/sn/addrs.h>
 
47
 
 
48
static void *sn_hwperf_salheap = NULL;
 
49
static int sn_hwperf_obj_cnt = 0;
 
50
static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
 
51
static int sn_hwperf_init(void);
 
52
static DEFINE_MUTEX(sn_hwperf_init_mutex);
 
53
 
 
54
#define cnode_possible(n)       ((n) < num_cnodes)
 
55
 
 
56
static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
 
57
{
 
58
        int e;
 
59
        u64 sz;
 
60
        struct sn_hwperf_object_info *objbuf = NULL;
 
61
 
 
62
        if ((e = sn_hwperf_init()) < 0) {
 
63
                printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e);
 
64
                goto out;
 
65
        }
 
66
 
 
67
        sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
 
68
        objbuf = vmalloc(sz);
 
69
        if (objbuf == NULL) {
 
70
                printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
 
71
                e = -ENOMEM;
 
72
                goto out;
 
73
        }
 
74
 
 
75
        e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
 
76
                0, sz, (u64) objbuf, 0, 0, NULL);
 
77
        if (e != SN_HWPERF_OP_OK) {
 
78
                e = -EINVAL;
 
79
                vfree(objbuf);
 
80
        }
 
81
 
 
82
out:
 
83
        *nobj = sn_hwperf_obj_cnt;
 
84
        *ret = objbuf;
 
85
        return e;
 
86
}
 
87
 
 
88
static int sn_hwperf_location_to_bpos(char *location,
 
89
        int *rack, int *bay, int *slot, int *slab)
 
90
{
 
91
        char type;
 
92
 
 
93
        /* first scan for an old style geoid string */
 
94
        if (sscanf(location, "%03d%c%02d#%d",
 
95
                rack, &type, bay, slab) == 4)
 
96
                *slot = 0; 
 
97
        else /* scan for a new bladed geoid string */
 
98
        if (sscanf(location, "%03d%c%02d^%02d#%d",
 
99
                rack, &type, bay, slot, slab) != 5)
 
100
                return -1; 
 
101
        /* success */
 
102
        return 0;
 
103
}
 
104
 
 
105
static int sn_hwperf_geoid_to_cnode(char *location)
 
106
{
 
107
        int cnode;
 
108
        geoid_t geoid;
 
109
        moduleid_t module_id;
 
110
        int rack, bay, slot, slab;
 
111
        int this_rack, this_bay, this_slot, this_slab;
 
112
 
 
113
        if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
 
114
                return -1;
 
115
 
 
116
        /*
 
117
         * FIXME: replace with cleaner for_each_XXX macro which addresses
 
118
         * both compute and IO nodes once ACPI3.0 is available.
 
119
         */
 
120
        for (cnode = 0; cnode < num_cnodes; cnode++) {
 
121
                geoid = cnodeid_get_geoid(cnode);
 
122
                module_id = geo_module(geoid);
 
123
                this_rack = MODULE_GET_RACK(module_id);
 
124
                this_bay = MODULE_GET_BPOS(module_id);
 
125
                this_slot = geo_slot(geoid);
 
126
                this_slab = geo_slab(geoid);
 
127
                if (rack == this_rack && bay == this_bay &&
 
128
                        slot == this_slot && slab == this_slab) {
 
129
                        break;
 
130
                }
 
131
        }
 
132
 
 
133
        return cnode_possible(cnode) ? cnode : -1;
 
134
}
 
135
 
 
136
static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
 
137
{
 
138
        if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
 
139
                BUG();
 
140
        if (SN_HWPERF_FOREIGN(obj))
 
141
                return -1;
 
142
        return sn_hwperf_geoid_to_cnode(obj->location);
 
143
}
 
144
 
 
145
static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
 
146
                                struct sn_hwperf_object_info *objs)
 
147
{
 
148
        int ordinal;
 
149
        struct sn_hwperf_object_info *p;
 
150
 
 
151
        for (ordinal=0, p=objs; p != obj; p++) {
 
152
                if (SN_HWPERF_FOREIGN(p))
 
153
                        continue;
 
154
                if (SN_HWPERF_SAME_OBJTYPE(p, obj))
 
155
                        ordinal++;
 
156
        }
 
157
 
 
158
        return ordinal;
 
159
}
 
160
 
 
161
static const char *slabname_node =      "node"; /* SHub asic */
 
162
static const char *slabname_ionode =    "ionode"; /* TIO asic */
 
163
static const char *slabname_router =    "router"; /* NL3R or NL4R */
 
164
static const char *slabname_other =     "other"; /* unknown asic */
 
165
 
 
166
static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj,
 
167
                        struct sn_hwperf_object_info *objs, int *ordinal)
 
168
{
 
169
        int isnode;
 
170
        const char *slabname = slabname_other;
 
171
 
 
172
        if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) {
 
173
                slabname = isnode ? slabname_node : slabname_ionode;
 
174
                *ordinal = sn_hwperf_obj_to_cnode(obj);
 
175
        }
 
176
        else {
 
177
                *ordinal = sn_hwperf_generic_ordinal(obj, objs);
 
178
                if (SN_HWPERF_IS_ROUTER(obj))
 
179
                        slabname = slabname_router;
 
180
        }
 
181
 
 
182
        return slabname;
 
183
}
 
184
 
 
185
static void print_pci_topology(struct seq_file *s)
 
186
{
 
187
        char *p;
 
188
        size_t sz;
 
189
        int e;
 
190
 
 
191
        for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
 
192
                if (!(p = kmalloc(sz, GFP_KERNEL)))
 
193
                        break;
 
194
                e = ia64_sn_ioif_get_pci_topology(__pa(p), sz);
 
195
                if (e == SALRET_OK)
 
196
                        seq_puts(s, p);
 
197
                kfree(p);
 
198
                if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED)
 
199
                        break;
 
200
        }
 
201
}
 
202
 
 
203
static inline int sn_hwperf_has_cpus(cnodeid_t node)
 
204
{
 
205
        return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node);
 
206
}
 
207
 
 
208
static inline int sn_hwperf_has_mem(cnodeid_t node)
 
209
{
 
210
        return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages;
 
211
}
 
212
 
 
213
static struct sn_hwperf_object_info *
 
214
sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf,
 
215
        int nobj, int id)
 
216
{
 
217
        int i;
 
218
        struct sn_hwperf_object_info *p = objbuf;
 
219
 
 
220
        for (i=0; i < nobj; i++, p++) {
 
221
                if (p->id == id)
 
222
                        return p;
 
223
        }
 
224
 
 
225
        return NULL;
 
226
 
 
227
}
 
228
 
 
229
static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf,
 
230
        int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
 
231
{
 
232
        int e;
 
233
        struct sn_hwperf_object_info *nodeobj = NULL;
 
234
        struct sn_hwperf_object_info *op;
 
235
        struct sn_hwperf_object_info *dest;
 
236
        struct sn_hwperf_object_info *router;
 
237
        struct sn_hwperf_port_info ptdata[16];
 
238
        int sz, i, j;
 
239
        cnodeid_t c;
 
240
        int found_mem = 0;
 
241
        int found_cpu = 0;
 
242
 
 
243
        if (!cnode_possible(node))
 
244
                return -EINVAL;
 
245
 
 
246
        if (sn_hwperf_has_cpus(node)) {
 
247
                if (near_cpu_node)
 
248
                        *near_cpu_node = node;
 
249
                found_cpu++;
 
250
        }
 
251
 
 
252
        if (sn_hwperf_has_mem(node)) {
 
253
                if (near_mem_node)
 
254
                        *near_mem_node = node;
 
255
                found_mem++;
 
256
        }
 
257
 
 
258
        if (found_cpu && found_mem)
 
259
                return 0; /* trivially successful */
 
260
 
 
261
        /* find the argument node object */
 
262
        for (i=0, op=objbuf; i < nobj; i++, op++) {
 
263
                if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op))
 
264
                        continue;
 
265
                if (node == sn_hwperf_obj_to_cnode(op)) {
 
266
                        nodeobj = op;
 
267
                        break;
 
268
                }
 
269
        }
 
270
        if (!nodeobj) {
 
271
                e = -ENOENT;
 
272
                goto err;
 
273
        }
 
274
 
 
275
        /* get it's interconnect topology */
 
276
        sz = op->ports * sizeof(struct sn_hwperf_port_info);
 
277
        BUG_ON(sz > sizeof(ptdata));
 
278
        e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 
279
                              SN_HWPERF_ENUM_PORTS, nodeobj->id, sz,
 
280
                              (u64)&ptdata, 0, 0, NULL);
 
281
        if (e != SN_HWPERF_OP_OK) {
 
282
                e = -EINVAL;
 
283
                goto err;
 
284
        }
 
285
 
 
286
        /* find nearest node with cpus and nearest memory */
 
287
        for (router=NULL, j=0; j < op->ports; j++) {
 
288
                dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id);
 
289
                if (dest && SN_HWPERF_IS_ROUTER(dest))
 
290
                        router = dest;
 
291
                if (!dest || SN_HWPERF_FOREIGN(dest) ||
 
292
                    !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) {
 
293
                        continue;
 
294
                }
 
295
                c = sn_hwperf_obj_to_cnode(dest);
 
296
                if (!found_cpu && sn_hwperf_has_cpus(c)) {
 
297
                        if (near_cpu_node)
 
298
                                *near_cpu_node = c;
 
299
                        found_cpu++;
 
300
                }
 
301
                if (!found_mem && sn_hwperf_has_mem(c)) {
 
302
                        if (near_mem_node)
 
303
                                *near_mem_node = c;
 
304
                        found_mem++;
 
305
                }
 
306
        }
 
307
 
 
308
        if (router && (!found_cpu || !found_mem)) {
 
309
                /* search for a node connected to the same router */
 
310
                sz = router->ports * sizeof(struct sn_hwperf_port_info);
 
311
                BUG_ON(sz > sizeof(ptdata));
 
312
                e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 
313
                                      SN_HWPERF_ENUM_PORTS, router->id, sz,
 
314
                                      (u64)&ptdata, 0, 0, NULL);
 
315
                if (e != SN_HWPERF_OP_OK) {
 
316
                        e = -EINVAL;
 
317
                        goto err;
 
318
                }
 
319
                for (j=0; j < router->ports; j++) {
 
320
                        dest = sn_hwperf_findobj_id(objbuf, nobj,
 
321
                                ptdata[j].conn_id);
 
322
                        if (!dest || dest->id == node ||
 
323
                            SN_HWPERF_FOREIGN(dest) ||
 
324
                            !SN_HWPERF_IS_NODE(dest) ||
 
325
                            SN_HWPERF_IS_IONODE(dest)) {
 
326
                                continue;
 
327
                        }
 
328
                        c = sn_hwperf_obj_to_cnode(dest);
 
329
                        if (!found_cpu && sn_hwperf_has_cpus(c)) {
 
330
                                if (near_cpu_node)
 
331
                                        *near_cpu_node = c;
 
332
                                found_cpu++;
 
333
                        }
 
334
                        if (!found_mem && sn_hwperf_has_mem(c)) {
 
335
                                if (near_mem_node)
 
336
                                        *near_mem_node = c;
 
337
                                found_mem++;
 
338
                        }
 
339
                        if (found_cpu && found_mem)
 
340
                                break;
 
341
                }
 
342
        }
 
343
 
 
344
        if (!found_cpu || !found_mem) {
 
345
                /* resort to _any_ node with CPUs and memory */
 
346
                for (i=0, op=objbuf; i < nobj; i++, op++) {
 
347
                        if (SN_HWPERF_FOREIGN(op) ||
 
348
                            SN_HWPERF_IS_IONODE(op) ||
 
349
                            !SN_HWPERF_IS_NODE(op)) {
 
350
                                continue;
 
351
                        }
 
352
                        c = sn_hwperf_obj_to_cnode(op);
 
353
                        if (!found_cpu && sn_hwperf_has_cpus(c)) {
 
354
                                if (near_cpu_node)
 
355
                                        *near_cpu_node = c;
 
356
                                found_cpu++;
 
357
                        }
 
358
                        if (!found_mem && sn_hwperf_has_mem(c)) {
 
359
                                if (near_mem_node)
 
360
                                        *near_mem_node = c;
 
361
                                found_mem++;
 
362
                        }
 
363
                        if (found_cpu && found_mem)
 
364
                                break;
 
365
                }
 
366
        }
 
367
 
 
368
        if (!found_cpu || !found_mem)
 
369
                e = -ENODATA;
 
370
 
 
371
err:
 
372
        return e;
 
373
}
 
374
 
 
375
 
 
376
static int sn_topology_show(struct seq_file *s, void *d)
 
377
{
 
378
        int sz;
 
379
        int pt;
 
380
        int e = 0;
 
381
        int i;
 
382
        int j;
 
383
        const char *slabname;
 
384
        int ordinal;
 
385
        char slice;
 
386
        struct cpuinfo_ia64 *c;
 
387
        struct sn_hwperf_port_info *ptdata;
 
388
        struct sn_hwperf_object_info *p;
 
389
        struct sn_hwperf_object_info *obj = d;  /* this object */
 
390
        struct sn_hwperf_object_info *objs = s->private; /* all objects */
 
391
        u8 shubtype;
 
392
        u8 system_size;
 
393
        u8 sharing_size;
 
394
        u8 partid;
 
395
        u8 coher;
 
396
        u8 nasid_shift;
 
397
        u8 region_size;
 
398
        u16 nasid_mask;
 
399
        int nasid_msb;
 
400
 
 
401
        if (obj == objs) {
 
402
                seq_printf(s, "# sn_topology version 2\n");
 
403
                seq_printf(s, "# objtype ordinal location partition"
 
404
                        " [attribute value [, ...]]\n");
 
405
 
 
406
                if (ia64_sn_get_sn_info(0,
 
407
                        &shubtype, &nasid_mask, &nasid_shift, &system_size,
 
408
                        &sharing_size, &partid, &coher, &region_size))
 
409
                        BUG();
 
410
                for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
 
411
                        if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
 
412
                                break;
 
413
                }
 
414
                seq_printf(s, "partition %u %s local "
 
415
                        "shubtype %s, "
 
416
                        "nasid_mask 0x%016llx, "
 
417
                        "nasid_bits %d:%d, "
 
418
                        "system_size %d, "
 
419
                        "sharing_size %d, "
 
420
                        "coherency_domain %d, "
 
421
                        "region_size %d\n",
 
422
 
 
423
                        partid, utsname()->nodename,
 
424
                        shubtype ? "shub2" : "shub1", 
 
425
                        (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
 
426
                        system_size, sharing_size, coher, region_size);
 
427
 
 
428
                print_pci_topology(s);
 
429
        }
 
430
 
 
431
        if (SN_HWPERF_FOREIGN(obj)) {
 
432
                /* private in another partition: not interesting */
 
433
                return 0;
 
434
        }
 
435
 
 
436
        for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
 
437
                if (obj->name[i] == ' ')
 
438
                        obj->name[i] = '_';
 
439
        }
 
440
 
 
441
        slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
 
442
        seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
 
443
                obj->sn_hwp_this_part ? "local" : "shared", obj->name);
 
444
 
 
445
        if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)))
 
446
                seq_putc(s, '\n');
 
447
        else {
 
448
                cnodeid_t near_mem = -1;
 
449
                cnodeid_t near_cpu = -1;
 
450
 
 
451
                seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
 
452
 
 
453
                if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt,
 
454
                        ordinal, &near_mem, &near_cpu) == 0) {
 
455
                        seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d",
 
456
                                near_mem, near_cpu);
 
457
                }
 
458
 
 
459
                if (!SN_HWPERF_IS_IONODE(obj)) {
 
460
                        for_each_online_node(i) {
 
461
                                seq_printf(s, i ? ":%d" : ", dist %d",
 
462
                                        node_distance(ordinal, i));
 
463
                        }
 
464
                }
 
465
 
 
466
                seq_putc(s, '\n');
 
467
 
 
468
                /*
 
469
                 * CPUs on this node, if any
 
470
                 */
 
471
                if (!SN_HWPERF_IS_IONODE(obj)) {
 
472
                        for_each_cpu_and(i, cpu_online_mask,
 
473
                                         cpumask_of_node(ordinal)) {
 
474
                                slice = 'a' + cpuid_to_slice(i);
 
475
                                c = cpu_data(i);
 
476
                                seq_printf(s, "cpu %d %s%c local"
 
477
                                           " freq %luMHz, arch ia64",
 
478
                                           i, obj->location, slice,
 
479
                                           c->proc_freq / 1000000);
 
480
                                for_each_online_cpu(j) {
 
481
                                        seq_printf(s, j ? ":%d" : ", dist %d",
 
482
                                                   node_distance(
 
483
                                                        cpu_to_node(i),
 
484
                                                        cpu_to_node(j)));
 
485
                                }
 
486
                                seq_putc(s, '\n');
 
487
                        }
 
488
                }
 
489
        }
 
490
 
 
491
        if (obj->ports) {
 
492
                /*
 
493
                 * numalink ports
 
494
                 */
 
495
                sz = obj->ports * sizeof(struct sn_hwperf_port_info);
 
496
                if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
 
497
                        return -ENOMEM;
 
498
                e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 
499
                                      SN_HWPERF_ENUM_PORTS, obj->id, sz,
 
500
                                      (u64) ptdata, 0, 0, NULL);
 
501
                if (e != SN_HWPERF_OP_OK)
 
502
                        return -EINVAL;
 
503
                for (ordinal=0, p=objs; p != obj; p++) {
 
504
                        if (!SN_HWPERF_FOREIGN(p))
 
505
                                ordinal += p->ports;
 
506
                }
 
507
                for (pt = 0; pt < obj->ports; pt++) {
 
508
                        for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
 
509
                                if (ptdata[pt].conn_id == p->id) {
 
510
                                        break;
 
511
                                }
 
512
                        }
 
513
                        seq_printf(s, "numalink %d %s-%d",
 
514
                            ordinal+pt, obj->location, ptdata[pt].port);
 
515
 
 
516
                        if (i >= sn_hwperf_obj_cnt) {
 
517
                                /* no connection */
 
518
                                seq_puts(s, " local endpoint disconnected"
 
519
                                            ", protocol unknown\n");
 
520
                                continue;
 
521
                        }
 
522
 
 
523
                        if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
 
524
                                /* both ends local to this partition */
 
525
                                seq_puts(s, " local");
 
526
                        else if (SN_HWPERF_FOREIGN(p))
 
527
                                /* both ends of the link in foreign partiton */
 
528
                                seq_puts(s, " foreign");
 
529
                        else
 
530
                                /* link straddles a partition */
 
531
                                seq_puts(s, " shared");
 
532
 
 
533
                        /*
 
534
                         * Unlikely, but strictly should query the LLP config
 
535
                         * registers because an NL4R can be configured to run
 
536
                         * NL3 protocol, even when not talking to an NL3 router.
 
537
                         * Ditto for node-node.
 
538
                         */
 
539
                        seq_printf(s, " endpoint %s-%d, protocol %s\n",
 
540
                                p->location, ptdata[pt].conn_port,
 
541
                                (SN_HWPERF_IS_NL3ROUTER(obj) ||
 
542
                                SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
 
543
                }
 
544
                kfree(ptdata);
 
545
        }
 
546
 
 
547
        return 0;
 
548
}
 
549
 
 
550
static void *sn_topology_start(struct seq_file *s, loff_t * pos)
 
551
{
 
552
        struct sn_hwperf_object_info *objs = s->private;
 
553
 
 
554
        if (*pos < sn_hwperf_obj_cnt)
 
555
                return (void *)(objs + *pos);
 
556
 
 
557
        return NULL;
 
558
}
 
559
 
 
560
static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
 
561
{
 
562
        ++*pos;
 
563
        return sn_topology_start(s, pos);
 
564
}
 
565
 
 
566
static void sn_topology_stop(struct seq_file *m, void *v)
 
567
{
 
568
        return;
 
569
}
 
570
 
 
571
/*
 
572
 * /proc/sgi_sn/sn_topology, read-only using seq_file
 
573
 */
 
574
static const struct seq_operations sn_topology_seq_ops = {
 
575
        .start = sn_topology_start,
 
576
        .next = sn_topology_next,
 
577
        .stop = sn_topology_stop,
 
578
        .show = sn_topology_show
 
579
};
 
580
 
 
581
struct sn_hwperf_op_info {
 
582
        u64 op;
 
583
        struct sn_hwperf_ioctl_args *a;
 
584
        void *p;
 
585
        int *v0;
 
586
        int ret;
 
587
};
 
588
 
 
589
static void sn_hwperf_call_sal(void *info)
 
590
{
 
591
        struct sn_hwperf_op_info *op_info = info;
 
592
        int r;
 
593
 
 
594
        r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
 
595
                      op_info->a->arg, op_info->a->sz,
 
596
                      (u64) op_info->p, 0, 0, op_info->v0);
 
597
        op_info->ret = r;
 
598
}
 
599
 
 
600
static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
 
601
{
 
602
        u32 cpu;
 
603
        u32 use_ipi;
 
604
        int r = 0;
 
605
        cpumask_t save_allowed;
 
606
        
 
607
        cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
 
608
        use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
 
609
        op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
 
610
 
 
611
        if (cpu != SN_HWPERF_ARG_ANY_CPU) {
 
612
                if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
 
613
                        r = -EINVAL;
 
614
                        goto out;
 
615
                }
 
616
        }
 
617
 
 
618
        if (cpu == SN_HWPERF_ARG_ANY_CPU) {
 
619
                /* don't care which cpu */
 
620
                sn_hwperf_call_sal(op_info);
 
621
        } else if (cpu == get_cpu()) {
 
622
                /* already on correct cpu */
 
623
                sn_hwperf_call_sal(op_info);
 
624
                put_cpu();
 
625
        } else {
 
626
                put_cpu();
 
627
                if (use_ipi) {
 
628
                        /* use an interprocessor interrupt to call SAL */
 
629
                        smp_call_function_single(cpu, sn_hwperf_call_sal,
 
630
                                op_info, 1);
 
631
                }
 
632
                else {
 
633
                        /* migrate the task before calling SAL */ 
 
634
                        save_allowed = current->cpus_allowed;
 
635
                        set_cpus_allowed_ptr(current, cpumask_of(cpu));
 
636
                        sn_hwperf_call_sal(op_info);
 
637
                        set_cpus_allowed_ptr(current, &save_allowed);
 
638
                }
 
639
        }
 
640
        r = op_info->ret;
 
641
 
 
642
out:
 
643
        return r;
 
644
}
 
645
 
 
646
/* map SAL hwperf error code to system error code */
 
647
static int sn_hwperf_map_err(int hwperf_err)
 
648
{
 
649
        int e;
 
650
 
 
651
        switch(hwperf_err) {
 
652
        case SN_HWPERF_OP_OK:
 
653
                e = 0;
 
654
                break;
 
655
 
 
656
        case SN_HWPERF_OP_NOMEM:
 
657
                e = -ENOMEM;
 
658
                break;
 
659
 
 
660
        case SN_HWPERF_OP_NO_PERM:
 
661
                e = -EPERM;
 
662
                break;
 
663
 
 
664
        case SN_HWPERF_OP_IO_ERROR:
 
665
                e = -EIO;
 
666
                break;
 
667
 
 
668
        case SN_HWPERF_OP_BUSY:
 
669
                e = -EBUSY;
 
670
                break;
 
671
 
 
672
        case SN_HWPERF_OP_RECONFIGURE:
 
673
                e = -EAGAIN;
 
674
                break;
 
675
 
 
676
        case SN_HWPERF_OP_INVAL:
 
677
        default:
 
678
                e = -EINVAL;
 
679
                break;
 
680
        }
 
681
 
 
682
        return e;
 
683
}
 
684
 
 
685
/*
 
686
 * ioctl for "sn_hwperf" misc device
 
687
 */
 
688
static long sn_hwperf_ioctl(struct file *fp, u32 op, unsigned long arg)
 
689
{
 
690
        struct sn_hwperf_ioctl_args a;
 
691
        struct cpuinfo_ia64 *cdata;
 
692
        struct sn_hwperf_object_info *objs;
 
693
        struct sn_hwperf_object_info *cpuobj;
 
694
        struct sn_hwperf_op_info op_info;
 
695
        void *p = NULL;
 
696
        int nobj;
 
697
        char slice;
 
698
        int node;
 
699
        int r;
 
700
        int v0;
 
701
        int i;
 
702
        int j;
 
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) {
 
749
                        int cpuobj_index = 0;
 
750
 
 
751
                        memset(p, 0, a.sz);
 
752
                        for (i = 0; i < nobj; i++) {
 
753
                                if (!SN_HWPERF_IS_NODE(objs + i))
 
754
                                        continue;
 
755
                                node = sn_hwperf_obj_to_cnode(objs + i);
 
756
                                for_each_online_cpu(j) {
 
757
                                        if (node != cpu_to_node(j))
 
758
                                                continue;
 
759
                                        cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++;
 
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) ||
 
781
                   (node = a.arg) < 0 || !cnode_possible(node)) {
 
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
                i = a.arg;
 
790
                if (a.sz != sizeof(u64) || i < 0) {
 
791
                        r = -EINVAL;
 
792
                        goto error;
 
793
                }
 
794
                if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 
795
                        if (i >= nobj) {
 
796
                                r = -EINVAL;
 
797
                                vfree(objs);
 
798
                                goto error;
 
799
                        }
 
800
                        if (objs[i].id != a.arg) {
 
801
                                for (i = 0; i < nobj; i++) {
 
802
                                        if (objs[i].id == a.arg)
 
803
                                                break;
 
804
                                }
 
805
                        }
 
806
                        if (i == nobj) {
 
807
                                r = -EINVAL;
 
808
                                vfree(objs);
 
809
                                goto error;
 
810
                        }
 
811
 
 
812
                        if (!SN_HWPERF_IS_NODE(objs + i) &&
 
813
                            !SN_HWPERF_IS_IONODE(objs + i)) {
 
814
                                r = -ENOENT;
 
815
                                vfree(objs);
 
816
                                goto error;
 
817
                        }
 
818
 
 
819
                        *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
 
820
                        vfree(objs);
 
821
                }
 
822
                break;
 
823
 
 
824
        case SN_HWPERF_GET_MMRS:
 
825
        case SN_HWPERF_SET_MMRS:
 
826
        case SN_HWPERF_OBJECT_DISTANCE:
 
827
                op_info.p = p;
 
828
                op_info.a = &a;
 
829
                op_info.v0 = &v0;
 
830
                op_info.op = op;
 
831
                r = sn_hwperf_op_cpu(&op_info);
 
832
                if (r) {
 
833
                        r = sn_hwperf_map_err(r);
 
834
                        a.v0 = v0;
 
835
                        goto error;
 
836
                }
 
837
                break;
 
838
 
 
839
        default:
 
840
                /* all other ops are a direct SAL call */
 
841
                r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
 
842
                              a.arg, a.sz, (u64) p, 0, 0, &v0);
 
843
                if (r) {
 
844
                        r = sn_hwperf_map_err(r);
 
845
                        goto error;
 
846
                }
 
847
                a.v0 = v0;
 
848
                break;
 
849
        }
 
850
 
 
851
        if (op & SN_HWPERF_OP_MEM_COPYOUT) {
 
852
                r = copy_to_user((void __user *)a.ptr, p, a.sz);
 
853
                if (r != 0) {
 
854
                        r = -EFAULT;
 
855
                        goto error;
 
856
                }
 
857
        }
 
858
 
 
859
error:
 
860
        vfree(p);
 
861
 
 
862
        return r;
 
863
}
 
864
 
 
865
static const struct file_operations sn_hwperf_fops = {
 
866
        .unlocked_ioctl = sn_hwperf_ioctl,
 
867
        .llseek = noop_llseek,
 
868
};
 
869
 
 
870
static struct miscdevice sn_hwperf_dev = {
 
871
        MISC_DYNAMIC_MINOR,
 
872
        "sn_hwperf",
 
873
        &sn_hwperf_fops
 
874
};
 
875
 
 
876
static int sn_hwperf_init(void)
 
877
{
 
878
        u64 v;
 
879
        int salr;
 
880
        int e = 0;
 
881
 
 
882
        /* single threaded, once-only initialization */
 
883
        mutex_lock(&sn_hwperf_init_mutex);
 
884
 
 
885
        if (sn_hwperf_salheap) {
 
886
                mutex_unlock(&sn_hwperf_init_mutex);
 
887
                return e;
 
888
        }
 
889
 
 
890
        /*
 
891
         * The PROM code needs a fixed reference node. For convenience the
 
892
         * same node as the console I/O is used.
 
893
         */
 
894
        sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
 
895
 
 
896
        /*
 
897
         * Request the needed size and install the PROM scratch area.
 
898
         * The PROM keeps various tracking bits in this memory area.
 
899
         */
 
900
        salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 
901
                                 (u64) SN_HWPERF_GET_HEAPSIZE, 0,
 
902
                                 (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
 
903
        if (salr != SN_HWPERF_OP_OK) {
 
904
                e = -EINVAL;
 
905
                goto out;
 
906
        }
 
907
 
 
908
        if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
 
909
                e = -ENOMEM;
 
910
                goto out;
 
911
        }
 
912
        salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 
913
                                 SN_HWPERF_INSTALL_HEAP, 0, v,
 
914
                                 (u64) sn_hwperf_salheap, 0, 0, NULL);
 
915
        if (salr != SN_HWPERF_OP_OK) {
 
916
                e = -EINVAL;
 
917
                goto out;
 
918
        }
 
919
 
 
920
        salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 
921
                                 SN_HWPERF_OBJECT_COUNT, 0,
 
922
                                 sizeof(u64), (u64) &v, 0, 0, NULL);
 
923
        if (salr != SN_HWPERF_OP_OK) {
 
924
                e = -EINVAL;
 
925
                goto out;
 
926
        }
 
927
        sn_hwperf_obj_cnt = (int)v;
 
928
 
 
929
out:
 
930
        if (e < 0 && sn_hwperf_salheap) {
 
931
                vfree(sn_hwperf_salheap);
 
932
                sn_hwperf_salheap = NULL;
 
933
                sn_hwperf_obj_cnt = 0;
 
934
        }
 
935
        mutex_unlock(&sn_hwperf_init_mutex);
 
936
        return e;
 
937
}
 
938
 
 
939
int sn_topology_open(struct inode *inode, struct file *file)
 
940
{
 
941
        int e;
 
942
        struct seq_file *seq;
 
943
        struct sn_hwperf_object_info *objbuf;
 
944
        int nobj;
 
945
 
 
946
        if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 
947
                e = seq_open(file, &sn_topology_seq_ops);
 
948
                seq = file->private_data;
 
949
                seq->private = objbuf;
 
950
        }
 
951
 
 
952
        return e;
 
953
}
 
954
 
 
955
int sn_topology_release(struct inode *inode, struct file *file)
 
956
{
 
957
        struct seq_file *seq = file->private_data;
 
958
 
 
959
        vfree(seq->private);
 
960
        return seq_release(inode, file);
 
961
}
 
962
 
 
963
int sn_hwperf_get_nearest_node(cnodeid_t node,
 
964
        cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
 
965
{
 
966
        int e;
 
967
        int nobj;
 
968
        struct sn_hwperf_object_info *objbuf;
 
969
 
 
970
        if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 
971
                e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj,
 
972
                        node, near_mem_node, near_cpu_node);
 
973
                vfree(objbuf);
 
974
        }
 
975
 
 
976
        return e;
 
977
}
 
978
 
 
979
static int __devinit sn_hwperf_misc_register_init(void)
 
980
{
 
981
        int e;
 
982
 
 
983
        if (!ia64_platform_is("sn2"))
 
984
                return 0;
 
985
 
 
986
        sn_hwperf_init();
 
987
 
 
988
        /*
 
989
         * Register a dynamic misc device for hwperf ioctls. Platforms
 
990
         * supporting hotplug will create /dev/sn_hwperf, else user
 
991
         * can to look up the minor number in /proc/misc.
 
992
         */
 
993
        if ((e = misc_register(&sn_hwperf_dev)) != 0) {
 
994
                printk(KERN_ERR "sn_hwperf_misc_register_init: failed to "
 
995
                "register misc device for \"%s\"\n", sn_hwperf_dev.name);
 
996
        }
 
997
 
 
998
        return e;
 
999
}
 
1000
 
 
1001
device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */
 
1002
EXPORT_SYMBOL(sn_hwperf_get_nearest_node);