git.oblomov.eu Git - linux-2.6/blob - 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) 2004-2005 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 <asm/processor.h>
  36 #include <asm/topology.h>
  37 #include <asm/smp.h>
  38 #include <asm/semaphore.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 DECLARE_MUTEX(sn_hwperf_init_mutex);
  53
  54 static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
  55 {
  56         int e;
  57         u64 sz;
  58         struct sn_hwperf_object_info *objbuf = NULL;
  59
  60         if ((e = sn_hwperf_init()) < 0) {
  61                 printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e);
  62                 goto out;
  63         }
  64
  65         sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
  66         if ((objbuf = (struct sn_hwperf_object_info *) vmalloc(sz)) == NULL) {
  67                 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
  68                 e = -ENOMEM;
  69                 goto out;
  70         }
  71
  72         e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
  73                 0, sz, (u64) objbuf, 0, 0, NULL);
  74         if (e != SN_HWPERF_OP_OK) {
  75                 e = -EINVAL;
  76                 vfree(objbuf);
  77         }
  78
  79 out:
  80         *nobj = sn_hwperf_obj_cnt;
  81         *ret = objbuf;
  82         return e;
  83 }
  84
  85 static int sn_hwperf_location_to_bpos(char *location,
  86         int *rack, int *bay, int *slot, int *slab)
  87 {
  88         char type;
  89
  90         /* first scan for an old style geoid string */
  91         if (sscanf(location, "%03d%c%02d#%d",
  92                 rack, &type, bay, slab) == 4)
  93                 *slot = 0;
  94         else /* scan for a new bladed geoid string */
  95         if (sscanf(location, "%03d%c%02d^%02d#%d",
  96                 rack, &type, bay, slot, slab) != 5)
  97                 return -1;
  98         /* success */
  99         return 0;
 100 }
 101
 102 static int sn_hwperf_geoid_to_cnode(char *location)
 103 {
 104         int cnode;
 105         geoid_t geoid;
 106         moduleid_t module_id;
 107         int rack, bay, slot, slab;
 108         int this_rack, this_bay, this_slot, this_slab;
 109
 110         if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
 111                 return -1;
 112
 113         for_each_node(cnode) {
 114                 geoid = cnodeid_get_geoid(cnode);
 115                 module_id = geo_module(geoid);
 116                 this_rack = MODULE_GET_RACK(module_id);
 117                 this_bay = MODULE_GET_BPOS(module_id);
 118                 this_slot = geo_slot(geoid);
 119                 this_slab = geo_slab(geoid);
 120                 if (rack == this_rack && bay == this_bay &&
 121                         slot == this_slot && slab == this_slab) {
 122                         break;
 123                 }
 124         }
 125
 126         return node_possible(cnode) ? cnode : -1;
 127 }
 128
 129 static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
 130 {
 131         if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
 132                 BUG();
 133         if (!obj->sn_hwp_this_part)
 134                 return -1;
 135         return sn_hwperf_geoid_to_cnode(obj->location);
 136 }
 137
 138 static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
 139                                 struct sn_hwperf_object_info *objs)
 140 {
 141         int ordinal;
 142         struct sn_hwperf_object_info *p;
 143
 144         for (ordinal=0, p=objs; p != obj; p++) {
 145                 if (SN_HWPERF_FOREIGN(p))
 146                         continue;
 147                 if (SN_HWPERF_SAME_OBJTYPE(p, obj))
 148                         ordinal++;
 149         }
 150
 151         return ordinal;
 152 }
 153
 154 static const char *slabname_node =      "node"; /* SHub asic */
 155 static const char *slabname_ionode =    "ionode"; /* TIO asic */
 156 static const char *slabname_router =    "router"; /* NL3R or NL4R */
 157 static const char *slabname_other =     "other"; /* unknown asic */
 158
 159 static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj,
 160                         struct sn_hwperf_object_info *objs, int *ordinal)
 161 {
 162         int isnode;
 163         const char *slabname = slabname_other;
 164
 165         if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) {
 166                 slabname = isnode ? slabname_node : slabname_ionode;
 167                 *ordinal = sn_hwperf_obj_to_cnode(obj);
 168         }
 169         else {
 170                 *ordinal = sn_hwperf_generic_ordinal(obj, objs);
 171                 if (SN_HWPERF_IS_ROUTER(obj))
 172                         slabname = slabname_router;
 173         }
 174
 175         return slabname;
 176 }
 177
 178 static void print_pci_topology(struct seq_file *s)
 179 {
 180         char *p;
 181         size_t sz;
 182         int e;
 183
 184         for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
 185                 if (!(p = (char *)kmalloc(sz, GFP_KERNEL)))
 186                         break;
 187                 e = ia64_sn_ioif_get_pci_topology(__pa(p), sz);
 188                 if (e == SALRET_OK)
 189                         seq_puts(s, p);
 190                 kfree(p);
 191                 if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED)
 192                         break;
 193         }
 194 }
 195
 196 static inline int sn_hwperf_has_cpus(cnodeid_t node)
 197 {
 198         return node_online(node) && nr_cpus_node(node);
 199 }
 200
 201 static inline int sn_hwperf_has_mem(cnodeid_t node)
 202 {
 203         return node_online(node) && NODE_DATA(node)->node_present_pages;
 204 }
 205
 206 static struct sn_hwperf_object_info *
 207 sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf,
 208         int nobj, int id)
 209 {
 210         int i;
 211         struct sn_hwperf_object_info *p = objbuf;
 212
 213         for (i=0; i < nobj; i++, p++) {
 214                 if (p->id == id)
 215                         return p;
 216         }
 217
 218         return NULL;
 219
 220 }
 221
 222 static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf,
 223         int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
 224 {
 225         int e;
 226         struct sn_hwperf_object_info *nodeobj = NULL;
 227         struct sn_hwperf_object_info *op;
 228         struct sn_hwperf_object_info *dest;
 229         struct sn_hwperf_object_info *router;
 230         struct sn_hwperf_port_info ptdata[16];
 231         int sz, i, j;
 232         cnodeid_t c;
 233         int found_mem = 0;
 234         int found_cpu = 0;
 235
 236         if (!node_possible(node))
 237                 return -EINVAL;
 238
 239         if (sn_hwperf_has_cpus(node)) {
 240                 if (near_cpu_node)
 241                         *near_cpu_node = node;
 242                 found_cpu++;
 243         }
 244
 245         if (sn_hwperf_has_mem(node)) {
 246                 if (near_mem_node)
 247                         *near_mem_node = node;
 248                 found_mem++;
 249         }
 250
 251         if (found_cpu && found_mem)
 252                 return 0; /* trivially successful */
 253
 254         /* find the argument node object */
 255         for (i=0, op=objbuf; i < nobj; i++, op++) {
 256                 if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op))
 257                         continue;
 258                 if (node == sn_hwperf_obj_to_cnode(op)) {
 259                         nodeobj = op;
 260                         break;
 261                 }
 262         }
 263         if (!nodeobj) {
 264                 e = -ENOENT;
 265                 goto err;
 266         }
 267
 268         /* get it's interconnect topology */
 269         sz = op->ports * sizeof(struct sn_hwperf_port_info);
 270         if (sz > sizeof(ptdata))
 271                 BUG();
 272         e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 273                               SN_HWPERF_ENUM_PORTS, nodeobj->id, sz,
 274                               (u64)&ptdata, 0, 0, NULL);
 275         if (e != SN_HWPERF_OP_OK) {
 276                 e = -EINVAL;
 277                 goto err;
 278         }
 279
 280         /* find nearest node with cpus and nearest memory */
 281         for (router=NULL, j=0; j < op->ports; j++) {
 282                 dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id);
 283                 if (!dest || SN_HWPERF_FOREIGN(dest) ||
 284                     !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) {
 285                         continue;
 286                 }
 287                 c = sn_hwperf_obj_to_cnode(dest);
 288                 if (!found_cpu && sn_hwperf_has_cpus(c)) {
 289                         if (near_cpu_node)
 290                                 *near_cpu_node = c;
 291                         found_cpu++;
 292                 }
 293                 if (!found_mem && sn_hwperf_has_mem(c)) {
 294                         if (near_mem_node)
 295                                 *near_mem_node = c;
 296                         found_mem++;
 297                 }
 298                 if (SN_HWPERF_IS_ROUTER(dest))
 299                         router = dest;
 300         }
 301
 302         if (router && (!found_cpu || !found_mem)) {
 303                 /* search for a node connected to the same router */
 304                 sz = router->ports * sizeof(struct sn_hwperf_port_info);
 305                 if (sz > sizeof(ptdata))
 306                         BUG();
 307                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 308                                       SN_HWPERF_ENUM_PORTS, router->id, sz,
 309                                       (u64)&ptdata, 0, 0, NULL);
 310                 if (e != SN_HWPERF_OP_OK) {
 311                         e = -EINVAL;
 312                         goto err;
 313                 }
 314                 for (j=0; j < router->ports; j++) {
 315                         dest = sn_hwperf_findobj_id(objbuf, nobj,
 316                                 ptdata[j].conn_id);
 317                         if (!dest || dest->id == node ||
 318                             SN_HWPERF_FOREIGN(dest) ||
 319                             !SN_HWPERF_IS_NODE(dest) ||
 320                             SN_HWPERF_IS_IONODE(dest)) {
 321                                 continue;
 322                         }
 323                         c = sn_hwperf_obj_to_cnode(dest);
 324                         if (!found_cpu && sn_hwperf_has_cpus(c)) {
 325                                 if (near_cpu_node)
 326                                         *near_cpu_node = c;
 327                                 found_cpu++;
 328                         }
 329                         if (!found_mem && sn_hwperf_has_mem(c)) {
 330                                 if (near_mem_node)
 331                                         *near_mem_node = c;
 332                                 found_mem++;
 333                         }
 334                         if (found_cpu && found_mem)
 335                                 break;
 336                 }
 337         }
 338
 339         if (!found_cpu || !found_mem) {
 340                 /* resort to _any_ node with CPUs and memory */
 341                 for (i=0, op=objbuf; i < nobj; i++, op++) {
 342                         if (SN_HWPERF_FOREIGN(op) ||
 343                             SN_HWPERF_IS_IONODE(op) ||
 344                             !SN_HWPERF_IS_NODE(op)) {
 345                                 continue;
 346                         }
 347                         c = sn_hwperf_obj_to_cnode(op);
 348                         if (!found_cpu && sn_hwperf_has_cpus(c)) {
 349                                 if (near_cpu_node)
 350                                         *near_cpu_node = c;
 351                                 found_cpu++;
 352                         }
 353                         if (!found_mem && sn_hwperf_has_mem(c)) {
 354                                 if (near_mem_node)
 355                                         *near_mem_node = c;
 356                                 found_mem++;
 357                         }
 358                         if (found_cpu && found_mem)
 359                                 break;
 360                 }
 361         }
 362
 363         if (!found_cpu || !found_mem)
 364                 e = -ENODATA;
 365
 366 err:
 367         return e;
 368 }
 369
 370
 371 static int sn_topology_show(struct seq_file *s, void *d)
 372 {
 373         int sz;
 374         int pt;
 375         int e = 0;
 376         int i;
 377         int j;
 378         const char *slabname;
 379         int ordinal;
 380         cpumask_t cpumask;
 381         char slice;
 382         struct cpuinfo_ia64 *c;
 383         struct sn_hwperf_port_info *ptdata;
 384         struct sn_hwperf_object_info *p;
 385         struct sn_hwperf_object_info *obj = d;  /* this object */
 386         struct sn_hwperf_object_info *objs = s->private; /* all objects */
 387         u8 shubtype;
 388         u8 system_size;
 389         u8 sharing_size;
 390         u8 partid;
 391         u8 coher;
 392         u8 nasid_shift;
 393         u8 region_size;
 394         u16 nasid_mask;
 395         int nasid_msb;
 396
 397         if (obj == objs) {
 398                 seq_printf(s, "# sn_topology version 2\n");
 399                 seq_printf(s, "# objtype ordinal location partition"
 400                         " [attribute value [, ...]]\n");
 401
 402                 if (ia64_sn_get_sn_info(0,
 403                         &shubtype, &nasid_mask, &nasid_shift, &system_size,
 404                         &sharing_size, &partid, &coher, &region_size))
 405                         BUG();
 406                 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
 407                         if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
 408                                 break;
 409                 }
 410                 seq_printf(s, "partition %u %s local "
 411                         "shubtype %s, "
 412                         "nasid_mask 0x%016lx, "
 413                         "nasid_bits %d:%d, "
 414                         "system_size %d, "
 415                         "sharing_size %d, "
 416                         "coherency_domain %d, "
 417                         "region_size %d\n",
 418
 419                         partid, system_utsname.nodename,
 420                         shubtype ? "shub2" : "shub1",
 421                         (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
 422                         system_size, sharing_size, coher, region_size);
 423
 424                 print_pci_topology(s);
 425         }
 426
 427         if (SN_HWPERF_FOREIGN(obj)) {
 428                 /* private in another partition: not interesting */
 429                 return 0;
 430         }
 431
 432         for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
 433                 if (obj->name[i] == ' ')
 434                         obj->name[i] = '_';
 435         }
 436
 437         slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
 438         seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
 439                 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
 440
 441         if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
 442                 seq_putc(s, '\n');
 443         else {
 444                 cnodeid_t near_mem = -1;
 445                 cnodeid_t near_cpu = -1;
 446
 447                 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
 448
 449                 if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt,
 450                         ordinal, &near_mem, &near_cpu) == 0) {
 451                         seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d",
 452                                 near_mem, near_cpu);
 453                 }
 454
 455                 if (!SN_HWPERF_IS_IONODE(obj)) {
 456                         for_each_online_node(i) {
 457                                 seq_printf(s, i ? ":%d" : ", dist %d",
 458                                         node_distance(ordinal, i));
 459                         }
 460                 }
 461
 462                 seq_putc(s, '\n');
 463
 464                 /*
 465                  * CPUs on this node, if any
 466                  */
 467                 cpumask = node_to_cpumask(ordinal);
 468                 for_each_online_cpu(i) {
 469                         if (cpu_isset(i, cpumask)) {
 470                                 slice = 'a' + cpuid_to_slice(i);
 471                                 c = cpu_data(i);
 472                                 seq_printf(s, "cpu %d %s%c local"
 473                                         " freq %luMHz, arch ia64",
 474                                         i, obj->location, slice,
 475                                         c->proc_freq / 1000000);
 476                                 for_each_online_cpu(j) {
 477                                         seq_printf(s, j ? ":%d" : ", dist %d",
 478                                                 node_distance(
 479                                                     cpuid_to_cnodeid(i),
 480                                                     cpuid_to_cnodeid(j)));
 481                                 }
 482                                 seq_putc(s, '\n');
 483                         }
 484                 }
 485         }
 486
 487         if (obj->ports) {
 488                 /*
 489                  * numalink ports
 490                  */
 491                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
 492                 if ((ptdata = vmalloc(sz)) == NULL)
 493                         return -ENOMEM;
 494                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 495                                       SN_HWPERF_ENUM_PORTS, obj->id, sz,
 496                                       (u64) ptdata, 0, 0, NULL);
 497                 if (e != SN_HWPERF_OP_OK)
 498                         return -EINVAL;
 499                 for (ordinal=0, p=objs; p != obj; p++) {
 500                         if (!SN_HWPERF_FOREIGN(p))
 501                                 ordinal += p->ports;
 502                 }
 503                 for (pt = 0; pt < obj->ports; pt++) {
 504                         for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
 505                                 if (ptdata[pt].conn_id == p->id) {
 506                                         break;
 507                                 }
 508                         }
 509                         seq_printf(s, "numalink %d %s-%d",
 510                             ordinal+pt, obj->location, ptdata[pt].port);
 511
 512                         if (i >= sn_hwperf_obj_cnt) {
 513                                 /* no connection */
 514                                 seq_puts(s, " local endpoint disconnected"
 515                                             ", protocol unknown\n");
 516                                 continue;
 517                         }
 518
 519                         if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
 520                                 /* both ends local to this partition */
 521                                 seq_puts(s, " local");
 522                         else if (!obj->sn_hwp_this_part && !p->sn_hwp_this_part)
 523                                 /* both ends of the link in foreign partiton */
 524                                 seq_puts(s, " foreign");
 525                         else
 526                                 /* link straddles a partition */
 527                                 seq_puts(s, " shared");
 528
 529                         /*
 530                          * Unlikely, but strictly should query the LLP config
 531                          * registers because an NL4R can be configured to run
 532                          * NL3 protocol, even when not talking to an NL3 router.
 533                          * Ditto for node-node.
 534                          */
 535                         seq_printf(s, " endpoint %s-%d, protocol %s\n",
 536                                 p->location, ptdata[pt].conn_port,
 537                                 (SN_HWPERF_IS_NL3ROUTER(obj) ||
 538                                 SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
 539                 }
 540                 vfree(ptdata);
 541         }
 542
 543         return 0;
 544 }
 545
 546 static void *sn_topology_start(struct seq_file *s, loff_t * pos)
 547 {
 548         struct sn_hwperf_object_info *objs = s->private;
 549
 550         if (*pos < sn_hwperf_obj_cnt)
 551                 return (void *)(objs + *pos);
 552
 553         return NULL;
 554 }
 555
 556 static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
 557 {
 558         ++*pos;
 559         return sn_topology_start(s, pos);
 560 }
 561
 562 static void sn_topology_stop(struct seq_file *m, void *v)
 563 {
 564         return;
 565 }
 566
 567 /*
 568  * /proc/sgi_sn/sn_topology, read-only using seq_file
 569  */
 570 static struct seq_operations sn_topology_seq_ops = {
 571         .start = sn_topology_start,
 572         .next = sn_topology_next,
 573         .stop = sn_topology_stop,
 574         .show = sn_topology_show
 575 };
 576
 577 struct sn_hwperf_op_info {
 578         u64 op;
 579         struct sn_hwperf_ioctl_args *a;
 580         void *p;
 581         int *v0;
 582         int ret;
 583 };
 584
 585 static void sn_hwperf_call_sal(void *info)
 586 {
 587         struct sn_hwperf_op_info *op_info = info;
 588         int r;
 589
 590         r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
 591                       op_info->a->arg, op_info->a->sz,
 592                       (u64) op_info->p, 0, 0, op_info->v0);
 593         op_info->ret = r;
 594 }
 595
 596 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
 597 {
 598         u32 cpu;
 599         u32 use_ipi;
 600         int r = 0;
 601         cpumask_t save_allowed;
 602
 603         cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
 604         use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
 605         op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
 606
 607         if (cpu != SN_HWPERF_ARG_ANY_CPU) {
 608                 if (cpu >= num_online_cpus() || !cpu_online(cpu)) {
 609                         r = -EINVAL;
 610                         goto out;
 611                 }
 612         }
 613
 614         if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
 615                 /* don't care, or already on correct cpu */
 616                 sn_hwperf_call_sal(op_info);
 617         }
 618         else {
 619                 if (use_ipi) {
 620                         /* use an interprocessor interrupt to call SAL */
 621                         smp_call_function_single(cpu, sn_hwperf_call_sal,
 622                                 op_info, 1, 1);
 623                 }
 624                 else {
 625                         /* migrate the task before calling SAL */
 626                         save_allowed = current->cpus_allowed;
 627                         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 628                         sn_hwperf_call_sal(op_info);
 629                         set_cpus_allowed(current, save_allowed);
 630                 }
 631         }
 632         r = op_info->ret;
 633
 634 out:
 635         return r;
 636 }
 637
 638 /* map SAL hwperf error code to system error code */
 639 static int sn_hwperf_map_err(int hwperf_err)
 640 {
 641         int e;
 642
 643         switch(hwperf_err) {
 644         case SN_HWPERF_OP_OK:
 645                 e = 0;
 646                 break;
 647
 648         case SN_HWPERF_OP_NOMEM:
 649                 e = -ENOMEM;
 650                 break;
 651
 652         case SN_HWPERF_OP_NO_PERM:
 653                 e = -EPERM;
 654                 break;
 655
 656         case SN_HWPERF_OP_IO_ERROR:
 657                 e = -EIO;
 658                 break;
 659
 660         case SN_HWPERF_OP_BUSY:
 661                 e = -EBUSY;
 662                 break;
 663
 664         case SN_HWPERF_OP_RECONFIGURE:
 665                 e = -EAGAIN;
 666                 break;
 667
 668         case SN_HWPERF_OP_INVAL:
 669         default:
 670                 e = -EINVAL;
 671                 break;
 672         }
 673
 674         return e;
 675 }
 676
 677 /*
 678  * ioctl for "sn_hwperf" misc device
 679  */
 680 static int
 681 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 682 {
 683         struct sn_hwperf_ioctl_args a;
 684         struct cpuinfo_ia64 *cdata;
 685         struct sn_hwperf_object_info *objs;
 686         struct sn_hwperf_object_info *cpuobj;
 687         struct sn_hwperf_op_info op_info;
 688         void *p = NULL;
 689         int nobj;
 690         char slice;
 691         int node;
 692         int r;
 693         int v0;
 694         int i;
 695         int j;
 696
 697         unlock_kernel();
 698
 699         /* only user requests are allowed here */
 700         if ((op & SN_HWPERF_OP_MASK) < 10) {
 701                 r = -EINVAL;
 702                 goto error;
 703         }
 704         r = copy_from_user(&a, (const void __user *)arg,
 705                 sizeof(struct sn_hwperf_ioctl_args));
 706         if (r != 0) {
 707                 r = -EFAULT;
 708                 goto error;
 709         }
 710
 711         /*
 712          * Allocate memory to hold a kernel copy of the user buffer. The
 713          * buffer contents are either copied in or out (or both) of user
 714          * space depending on the flags encoded in the requested operation.
 715          */
 716         if (a.ptr) {
 717                 p = vmalloc(a.sz);
 718                 if (!p) {
 719                         r = -ENOMEM;
 720                         goto error;
 721                 }
 722         }
 723
 724         if (op & SN_HWPERF_OP_MEM_COPYIN) {
 725                 r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
 726                 if (r != 0) {
 727                         r = -EFAULT;
 728                         goto error;
 729                 }
 730         }
 731
 732         switch (op) {
 733         case SN_HWPERF_GET_CPU_INFO:
 734                 if (a.sz == sizeof(u64)) {
 735                         /* special case to get size needed */
 736                         *(u64 *) p = (u64) num_online_cpus() *
 737                                 sizeof(struct sn_hwperf_object_info);
 738                 } else
 739                 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
 740                         r = -ENOMEM;
 741                         goto error;
 742                 } else
 743                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 744                         memset(p, 0, a.sz);
 745                         for (i = 0; i < nobj; i++) {
 746                                 if (!SN_HWPERF_IS_NODE(objs + i))
 747                                         continue;
 748                                 node = sn_hwperf_obj_to_cnode(objs + i);
 749                                 for_each_online_cpu(j) {
 750                                         if (node != cpu_to_node(j))
 751                                                 continue;
 752                                         cpuobj = (struct sn_hwperf_object_info *) p + j;
 753                                         slice = 'a' + cpuid_to_slice(j);
 754                                         cdata = cpu_data(j);
 755                                         cpuobj->id = j;
 756                                         snprintf(cpuobj->name,
 757                                                  sizeof(cpuobj->name),
 758                                                  "CPU %luMHz %s",
 759                                                  cdata->proc_freq / 1000000,
 760                                                  cdata->vendor);
 761                                         snprintf(cpuobj->location,
 762                                                  sizeof(cpuobj->location),
 763                                                  "%s%c", objs[i].location,
 764                                                  slice);
 765                                 }
 766                         }
 767
 768                         vfree(objs);
 769                 }
 770                 break;
 771
 772         case SN_HWPERF_GET_NODE_NASID:
 773                 if (a.sz != sizeof(u64) ||
 774                    (node = a.arg) < 0 || !node_possible(node)) {
 775                         r = -EINVAL;
 776                         goto error;
 777                 }
 778                 *(u64 *)p = (u64)cnodeid_to_nasid(node);
 779                 break;
 780
 781         case SN_HWPERF_GET_OBJ_NODE:
 782                 if (a.sz != sizeof(u64) || a.arg < 0) {
 783                         r = -EINVAL;
 784                         goto error;
 785                 }
 786                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 787                         if (a.arg >= nobj) {
 788                                 r = -EINVAL;
 789                                 vfree(objs);
 790                                 goto error;
 791                         }
 792                         if (objs[(i = a.arg)].id != a.arg) {
 793                                 for (i = 0; i < nobj; i++) {
 794                                         if (objs[i].id == a.arg)
 795                                                 break;
 796                                 }
 797                         }
 798                         if (i == nobj) {
 799                                 r = -EINVAL;
 800                                 vfree(objs);
 801                                 goto error;
 802                         }
 803
 804                         if (!SN_HWPERF_IS_NODE(objs + i) &&
 805                             !SN_HWPERF_IS_IONODE(objs + i)) {
 806                                 r = -ENOENT;
 807                                 vfree(objs);
 808                                 goto error;
 809                         }
 810
 811                         *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
 812                         vfree(objs);
 813                 }
 814                 break;
 815
 816         case SN_HWPERF_GET_MMRS:
 817         case SN_HWPERF_SET_MMRS:
 818         case SN_HWPERF_OBJECT_DISTANCE:
 819                 op_info.p = p;
 820                 op_info.a = &a;
 821                 op_info.v0 = &v0;
 822                 op_info.op = op;
 823                 r = sn_hwperf_op_cpu(&op_info);
 824                 if (r) {
 825                         r = sn_hwperf_map_err(r);
 826                         a.v0 = v0;
 827                         goto error;
 828                 }
 829                 break;
 830
 831         default:
 832                 /* all other ops are a direct SAL call */
 833                 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
 834                               a.arg, a.sz, (u64) p, 0, 0, &v0);
 835                 if (r) {
 836                         r = sn_hwperf_map_err(r);
 837                         goto error;
 838                 }
 839                 a.v0 = v0;
 840                 break;
 841         }
 842
 843         if (op & SN_HWPERF_OP_MEM_COPYOUT) {
 844                 r = copy_to_user((void __user *)a.ptr, p, a.sz);
 845                 if (r != 0) {
 846                         r = -EFAULT;
 847                         goto error;
 848                 }
 849         }
 850
 851 error:
 852         vfree(p);
 853
 854         lock_kernel();
 855         return r;
 856 }
 857
 858 static struct file_operations sn_hwperf_fops = {
 859         .ioctl = sn_hwperf_ioctl,
 860 };
 861
 862 static struct miscdevice sn_hwperf_dev = {
 863         MISC_DYNAMIC_MINOR,
 864         "sn_hwperf",
 865         &sn_hwperf_fops
 866 };
 867
 868 static int sn_hwperf_init(void)
 869 {
 870         u64 v;
 871         int salr;
 872         int e = 0;
 873
 874         /* single threaded, once-only initialization */
 875         down(&sn_hwperf_init_mutex);
 876
 877         if (sn_hwperf_salheap) {
 878                 up(&sn_hwperf_init_mutex);
 879                 return e;
 880         }
 881
 882         /*
 883          * The PROM code needs a fixed reference node. For convenience the
 884          * same node as the console I/O is used.
 885          */
 886         sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
 887
 888         /*
 889          * Request the needed size and install the PROM scratch area.
 890          * The PROM keeps various tracking bits in this memory area.
 891          */
 892         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 893                                  (u64) SN_HWPERF_GET_HEAPSIZE, 0,
 894                                  (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
 895         if (salr != SN_HWPERF_OP_OK) {
 896                 e = -EINVAL;
 897                 goto out;
 898         }
 899
 900         if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
 901                 e = -ENOMEM;
 902                 goto out;
 903         }
 904         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 905                                  SN_HWPERF_INSTALL_HEAP, 0, v,
 906                                  (u64) sn_hwperf_salheap, 0, 0, NULL);
 907         if (salr != SN_HWPERF_OP_OK) {
 908                 e = -EINVAL;
 909                 goto out;
 910         }
 911
 912         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 913                                  SN_HWPERF_OBJECT_COUNT, 0,
 914                                  sizeof(u64), (u64) &v, 0, 0, NULL);
 915         if (salr != SN_HWPERF_OP_OK) {
 916                 e = -EINVAL;
 917                 goto out;
 918         }
 919         sn_hwperf_obj_cnt = (int)v;
 920
 921 out:
 922         if (e < 0 && sn_hwperf_salheap) {
 923                 vfree(sn_hwperf_salheap);
 924                 sn_hwperf_salheap = NULL;
 925                 sn_hwperf_obj_cnt = 0;
 926         }
 927         up(&sn_hwperf_init_mutex);
 928         return e;
 929 }
 930
 931 int sn_topology_open(struct inode *inode, struct file *file)
 932 {
 933         int e;
 934         struct seq_file *seq;
 935         struct sn_hwperf_object_info *objbuf;
 936         int nobj;
 937
 938         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 939                 e = seq_open(file, &sn_topology_seq_ops);
 940                 seq = file->private_data;
 941                 seq->private = objbuf;
 942         }
 943
 944         return e;
 945 }
 946
 947 int sn_topology_release(struct inode *inode, struct file *file)
 948 {
 949         struct seq_file *seq = file->private_data;
 950
 951         vfree(seq->private);
 952         return seq_release(inode, file);
 953 }
 954
 955 int sn_hwperf_get_nearest_node(cnodeid_t node,
 956         cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
 957 {
 958         int e;
 959         int nobj;
 960         struct sn_hwperf_object_info *objbuf;
 961
 962         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 963                 e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj,
 964                         node, near_mem_node, near_cpu_node);
 965                 vfree(objbuf);
 966         }
 967
 968         return e;
 969 }
 970
 971 static int __devinit sn_hwperf_misc_register_init(void)
 972 {
 973         int e;
 974
 975         sn_hwperf_init();
 976
 977         /*
 978          * Register a dynamic misc device for hwperf ioctls. Platforms
 979          * supporting hotplug will create /dev/sn_hwperf, else user
 980          * can to look up the minor number in /proc/misc.
 981          */
 982         if ((e = misc_register(&sn_hwperf_dev)) != 0) {
 983                 printk(KERN_ERR "sn_hwperf_misc_register_init: failed to "
 984                 "register misc device for \"%s\"\n", sn_hwperf_dev.name);
 985         }
 986
 987         return e;
 988 }
 989
 990 device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */
 991 EXPORT_SYMBOL(sn_hwperf_get_nearest_node);