[IA64] arch/ia64/hp/common/sba_iommu.c: Rename dev_info to adi
[linux-2.6.git] / 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/smp_lock.h>
34 #include <linux/nodemask.h>
35 #include <linux/smp.h>
36 #include <linux/mutex.h>
37
38 #include <asm/processor.h>
39 #include <asm/topology.h>
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>
47 #include <asm/sn/addrs.h>
48
49 static void *sn_hwperf_salheap = NULL;
50 static int sn_hwperf_obj_cnt = 0;
51 static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
52 static int sn_hwperf_init(void);
53 static DEFINE_MUTEX(sn_hwperf_init_mutex);
54
55 #define cnode_possible(n)       ((n) < num_cnodes)
56
57 static 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) {
64                 printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e);
65                 goto out;
66         }
67
68         sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
69         objbuf = vmalloc(sz);
70         if (objbuf == NULL) {
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
83 out:
84         *nobj = sn_hwperf_obj_cnt;
85         *ret = objbuf;
86         return e;
87 }
88
89 static 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
106 static int sn_hwperf_geoid_to_cnode(char *location)
107 {
108         int cnode;
109         geoid_t geoid;
110         moduleid_t module_id;
111         int rack, bay, slot, slab;
112         int this_rack, this_bay, this_slot, this_slab;
113
114         if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
115                 return -1;
116
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++) {
122                 geoid = cnodeid_get_geoid(cnode);
123                 module_id = geo_module(geoid);
124                 this_rack = MODULE_GET_RACK(module_id);
125                 this_bay = MODULE_GET_BPOS(module_id);
126                 this_slot = geo_slot(geoid);
127                 this_slab = geo_slab(geoid);
128                 if (rack == this_rack && bay == this_bay &&
129                         slot == this_slot && slab == this_slab) {
130                         break;
131                 }
132         }
133
134         return cnode_possible(cnode) ? cnode : -1;
135 }
136
137 static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
138 {
139         if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
140                 BUG();
141         if (SN_HWPERF_FOREIGN(obj))
142                 return -1;
143         return sn_hwperf_geoid_to_cnode(obj->location);
144 }
145
146 static 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
162 static const char *slabname_node =      "node"; /* SHub asic */
163 static const char *slabname_ionode =    "ionode"; /* TIO asic */
164 static const char *slabname_router =    "router"; /* NL3R or NL4R */
165 static const char *slabname_other =     "other"; /* unknown asic */
166
167 static 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
186 static void print_pci_topology(struct seq_file *s)
187 {
188         char *p;
189         size_t sz;
190         int e;
191
192         for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
193                 if (!(p = kmalloc(sz, GFP_KERNEL)))
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;
201         }
202 }
203
204 static inline int sn_hwperf_has_cpus(cnodeid_t node)
205 {
206         return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node);
207 }
208
209 static inline int sn_hwperf_has_mem(cnodeid_t node)
210 {
211         return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages;
212 }
213
214 static struct sn_hwperf_object_info *
215 sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf,
216         int nobj, int id)
217 {
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
230 static 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
244         if (!cnode_possible(node))
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);
278         BUG_ON(sz > sizeof(ptdata));
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);
290                 if (dest && SN_HWPERF_IS_ROUTER(dest))
291                         router = dest;
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                 }
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);
312                 BUG_ON(sz > sizeof(ptdata));
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)
365                                 break;
366                 }
367         }
368
369         if (!found_cpu || !found_mem)
370                 e = -ENODATA;
371
372 err:
373         return e;
374 }
375
376
377 static int sn_topology_show(struct seq_file *s, void *d)
378 {
379         int sz;
380         int pt;
381         int e = 0;
382         int i;
383         int j;
384         const char *slabname;
385         int ordinal;
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 */
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;
401
402         if (obj == objs) {
403                 seq_printf(s, "# sn_topology version 2\n");
404                 seq_printf(s, "# objtype ordinal location partition"
405                         " [attribute value [, ...]]\n");
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%016llx, "
418                         "nasid_bits %d:%d, "
419                         "system_size %d, "
420                         "sharing_size %d, "
421                         "coherency_domain %d, "
422                         "region_size %d\n",
423
424                         partid, utsname()->nodename,
425                         shubtype ? "shub2" : "shub1", 
426                         (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
427                         system_size, sharing_size, coher, region_size);
428
429                 print_pci_topology(s);
430         }
431
432         if (SN_HWPERF_FOREIGN(obj)) {
433                 /* private in another partition: not interesting */
434                 return 0;
435         }
436
437         for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
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
446         if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)))
447                 seq_putc(s, '\n');
448         else {
449                 cnodeid_t near_mem = -1;
450                 cnodeid_t near_cpu = -1;
451
452                 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
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                         }
465                 }
466
467                 seq_putc(s, '\n');
468
469                 /*
470                  * CPUs on this node, if any
471                  */
472                 if (!SN_HWPERF_IS_IONODE(obj)) {
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(
484                                                         cpu_to_node(i),
485                                                         cpu_to_node(j)));
486                                 }
487                                 seq_putc(s, '\n');
488                         }
489                 }
490         }
491
492         if (obj->ports) {
493                 /*
494                  * numalink ports
495                  */
496                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
497                 if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
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");
527                         else if (SN_HWPERF_FOREIGN(p))
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                 }
545                 kfree(ptdata);
546         }
547
548         return 0;
549 }
550
551 static 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
561 static 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
567 static 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  */
575 static const struct seq_operations sn_topology_seq_ops = {
576         .start = sn_topology_start,
577         .next = sn_topology_next,
578         .stop = sn_topology_stop,
579         .show = sn_topology_show
580 };
581
582 struct 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
590 static 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
601 static 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) {
613                 if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
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,
627                                 op_info, 1);
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
639 out:
640         return r;
641 }
642
643 /* map SAL hwperf error code to system error code */
644 static 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:
666                 e = -EBUSY;
667                 break;
668
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  */
685 static int
686 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, unsigned long 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) {
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         lock_kernel();
863         return r;
864 }
865
866 static const struct file_operations sn_hwperf_fops = {
867         .ioctl = sn_hwperf_ioctl,
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);