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) 2004-2006 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         if (sz > sizeof(ptdata))
 279                 BUG();
 280         e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 281                               SN_HWPERF_ENUM_PORTS, nodeobj->id, sz,
 282                               (u64)&ptdata, 0, 0, NULL);
 283         if (e != SN_HWPERF_OP_OK) {
 284                 e = -EINVAL;
 285                 goto err;
 286         }
 287
 288         /* find nearest node with cpus and nearest memory */
 289         for (router=NULL, j=0; j < op->ports; j++) {
 290                 dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id);
 291                 if (dest && SN_HWPERF_IS_ROUTER(dest))
 292                         router = dest;
 293                 if (!dest || SN_HWPERF_FOREIGN(dest) ||
 294                     !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) {
 295                         continue;
 296                 }
 297                 c = sn_hwperf_obj_to_cnode(dest);
 298                 if (!found_cpu && sn_hwperf_has_cpus(c)) {
 299                         if (near_cpu_node)
 300                                 *near_cpu_node = c;
 301                         found_cpu++;
 302                 }
 303                 if (!found_mem && sn_hwperf_has_mem(c)) {
 304                         if (near_mem_node)
 305                                 *near_mem_node = c;
 306                         found_mem++;
 307                 }
 308         }
 309
 310         if (router && (!found_cpu || !found_mem)) {
 311                 /* search for a node connected to the same router */
 312                 sz = router->ports * sizeof(struct sn_hwperf_port_info);
 313                 if (sz > sizeof(ptdata))
 314                         BUG();
 315                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 316                                       SN_HWPERF_ENUM_PORTS, router->id, sz,
 317                                       (u64)&ptdata, 0, 0, NULL);
 318                 if (e != SN_HWPERF_OP_OK) {
 319                         e = -EINVAL;
 320                         goto err;
 321                 }
 322                 for (j=0; j < router->ports; j++) {
 323                         dest = sn_hwperf_findobj_id(objbuf, nobj,
 324                                 ptdata[j].conn_id);
 325                         if (!dest || dest->id == node ||
 326                             SN_HWPERF_FOREIGN(dest) ||
 327                             !SN_HWPERF_IS_NODE(dest) ||
 328                             SN_HWPERF_IS_IONODE(dest)) {
 329                                 continue;
 330                         }
 331                         c = sn_hwperf_obj_to_cnode(dest);
 332                         if (!found_cpu && sn_hwperf_has_cpus(c)) {
 333                                 if (near_cpu_node)
 334                                         *near_cpu_node = c;
 335                                 found_cpu++;
 336                         }
 337                         if (!found_mem && sn_hwperf_has_mem(c)) {
 338                                 if (near_mem_node)
 339                                         *near_mem_node = c;
 340                                 found_mem++;
 341                         }
 342                         if (found_cpu && found_mem)
 343                                 break;
 344                 }
 345         }
 346
 347         if (!found_cpu || !found_mem) {
 348                 /* resort to _any_ node with CPUs and memory */
 349                 for (i=0, op=objbuf; i < nobj; i++, op++) {
 350                         if (SN_HWPERF_FOREIGN(op) ||
 351                             SN_HWPERF_IS_IONODE(op) ||
 352                             !SN_HWPERF_IS_NODE(op)) {
 353                                 continue;
 354                         }
 355                         c = sn_hwperf_obj_to_cnode(op);
 356                         if (!found_cpu && sn_hwperf_has_cpus(c)) {
 357                                 if (near_cpu_node)
 358                                         *near_cpu_node = c;
 359                                 found_cpu++;
 360                         }
 361                         if (!found_mem && sn_hwperf_has_mem(c)) {
 362                                 if (near_mem_node)
 363                                         *near_mem_node = c;
 364                                 found_mem++;
 365                         }
 366                         if (found_cpu && found_mem)
 367                                 break;
 368                 }
 369         }
 370
 371         if (!found_cpu || !found_mem)
 372                 e = -ENODATA;
 373
 374 err:
 375         return e;
 376 }
 377
 378
 379 static int sn_topology_show(struct seq_file *s, void *d)
 380 {
 381         int sz;
 382         int pt;
 383         int e = 0;
 384         int i;
 385         int j;
 386         const char *slabname;
 387         int ordinal;
 388         cpumask_t cpumask;
 389         char slice;
 390         struct cpuinfo_ia64 *c;
 391         struct sn_hwperf_port_info *ptdata;
 392         struct sn_hwperf_object_info *p;
 393         struct sn_hwperf_object_info *obj = d;  /* this object */
 394         struct sn_hwperf_object_info *objs = s->private; /* all objects */
 395         u8 shubtype;
 396         u8 system_size;
 397         u8 sharing_size;
 398         u8 partid;
 399         u8 coher;
 400         u8 nasid_shift;
 401         u8 region_size;
 402         u16 nasid_mask;
 403         int nasid_msb;
 404
 405         if (obj == objs) {
 406                 seq_printf(s, "# sn_topology version 2\n");
 407                 seq_printf(s, "# objtype ordinal location partition"
 408                         " [attribute value [, ...]]\n");
 409
 410                 if (ia64_sn_get_sn_info(0,
 411                         &shubtype, &nasid_mask, &nasid_shift, &system_size,
 412                         &sharing_size, &partid, &coher, &region_size))
 413                         BUG();
 414                 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
 415                         if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
 416                                 break;
 417                 }
 418                 seq_printf(s, "partition %u %s local "
 419                         "shubtype %s, "
 420                         "nasid_mask 0x%016lx, "
 421                         "nasid_bits %d:%d, "
 422                         "system_size %d, "
 423                         "sharing_size %d, "
 424                         "coherency_domain %d, "
 425                         "region_size %d\n",
 426
 427                         partid, utsname()->nodename,
 428                         shubtype ? "shub2" : "shub1",
 429                         (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
 430                         system_size, sharing_size, coher, region_size);
 431
 432                 print_pci_topology(s);
 433         }
 434
 435         if (SN_HWPERF_FOREIGN(obj)) {
 436                 /* private in another partition: not interesting */
 437                 return 0;
 438         }
 439
 440         for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
 441                 if (obj->name[i] == ' ')
 442                         obj->name[i] = '_';
 443         }
 444
 445         slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
 446         seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
 447                 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
 448
 449         if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)))
 450                 seq_putc(s, '\n');
 451         else {
 452                 cnodeid_t near_mem = -1;
 453                 cnodeid_t near_cpu = -1;
 454
 455                 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
 456
 457                 if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt,
 458                         ordinal, &near_mem, &near_cpu) == 0) {
 459                         seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d",
 460                                 near_mem, near_cpu);
 461                 }
 462
 463                 if (!SN_HWPERF_IS_IONODE(obj)) {
 464                         for_each_online_node(i) {
 465                                 seq_printf(s, i ? ":%d" : ", dist %d",
 466                                         node_distance(ordinal, i));
 467                         }
 468                 }
 469
 470                 seq_putc(s, '\n');
 471
 472                 /*
 473                  * CPUs on this node, if any
 474                  */
 475                 if (!SN_HWPERF_IS_IONODE(obj)) {
 476                         cpumask = node_to_cpumask(ordinal);
 477                         for_each_online_cpu(i) {
 478                                 if (cpu_isset(i, cpumask)) {
 479                                         slice = 'a' + cpuid_to_slice(i);
 480                                         c = cpu_data(i);
 481                                         seq_printf(s, "cpu %d %s%c local"
 482                                                 " freq %luMHz, arch ia64",
 483                                                 i, obj->location, slice,
 484                                                 c->proc_freq / 1000000);
 485                                         for_each_online_cpu(j) {
 486                                                 seq_printf(s, j ? ":%d" : ", dist %d",
 487                                                         node_distance(
 488                                                         cpu_to_node(i),
 489                                                         cpu_to_node(j)));
 490                                         }
 491                                         seq_putc(s, '\n');
 492                                 }
 493                         }
 494                 }
 495         }
 496
 497         if (obj->ports) {
 498                 /*
 499                  * numalink ports
 500                  */
 501                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
 502                 if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
 503                         return -ENOMEM;
 504                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 505                                       SN_HWPERF_ENUM_PORTS, obj->id, sz,
 506                                       (u64) ptdata, 0, 0, NULL);
 507                 if (e != SN_HWPERF_OP_OK)
 508                         return -EINVAL;
 509                 for (ordinal=0, p=objs; p != obj; p++) {
 510                         if (!SN_HWPERF_FOREIGN(p))
 511                                 ordinal += p->ports;
 512                 }
 513                 for (pt = 0; pt < obj->ports; pt++) {
 514                         for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
 515                                 if (ptdata[pt].conn_id == p->id) {
 516                                         break;
 517                                 }
 518                         }
 519                         seq_printf(s, "numalink %d %s-%d",
 520                             ordinal+pt, obj->location, ptdata[pt].port);
 521
 522                         if (i >= sn_hwperf_obj_cnt) {
 523                                 /* no connection */
 524                                 seq_puts(s, " local endpoint disconnected"
 525                                             ", protocol unknown\n");
 526                                 continue;
 527                         }
 528
 529                         if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
 530                                 /* both ends local to this partition */
 531                                 seq_puts(s, " local");
 532                         else if (SN_HWPERF_FOREIGN(p))
 533                                 /* both ends of the link in foreign partiton */
 534                                 seq_puts(s, " foreign");
 535                         else
 536                                 /* link straddles a partition */
 537                                 seq_puts(s, " shared");
 538
 539                         /*
 540                          * Unlikely, but strictly should query the LLP config
 541                          * registers because an NL4R can be configured to run
 542                          * NL3 protocol, even when not talking to an NL3 router.
 543                          * Ditto for node-node.
 544                          */
 545                         seq_printf(s, " endpoint %s-%d, protocol %s\n",
 546                                 p->location, ptdata[pt].conn_port,
 547                                 (SN_HWPERF_IS_NL3ROUTER(obj) ||
 548                                 SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
 549                 }
 550                 kfree(ptdata);
 551         }
 552
 553         return 0;
 554 }
 555
 556 static void *sn_topology_start(struct seq_file *s, loff_t * pos)
 557 {
 558         struct sn_hwperf_object_info *objs = s->private;
 559
 560         if (*pos < sn_hwperf_obj_cnt)
 561                 return (void *)(objs + *pos);
 562
 563         return NULL;
 564 }
 565
 566 static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
 567 {
 568         ++*pos;
 569         return sn_topology_start(s, pos);
 570 }
 571
 572 static void sn_topology_stop(struct seq_file *m, void *v)
 573 {
 574         return;
 575 }
 576
 577 /*
 578  * /proc/sgi_sn/sn_topology, read-only using seq_file
 579  */
 580 static const struct seq_operations sn_topology_seq_ops = {
 581         .start = sn_topology_start,
 582         .next = sn_topology_next,
 583         .stop = sn_topology_stop,
 584         .show = sn_topology_show
 585 };
 586
 587 struct sn_hwperf_op_info {
 588         u64 op;
 589         struct sn_hwperf_ioctl_args *a;
 590         void *p;
 591         int *v0;
 592         int ret;
 593 };
 594
 595 static void sn_hwperf_call_sal(void *info)
 596 {
 597         struct sn_hwperf_op_info *op_info = info;
 598         int r;
 599
 600         r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
 601                       op_info->a->arg, op_info->a->sz,
 602                       (u64) op_info->p, 0, 0, op_info->v0);
 603         op_info->ret = r;
 604 }
 605
 606 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
 607 {
 608         u32 cpu;
 609         u32 use_ipi;
 610         int r = 0;
 611         cpumask_t save_allowed;
 612
 613         cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
 614         use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
 615         op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
 616
 617         if (cpu != SN_HWPERF_ARG_ANY_CPU) {
 618                 if (cpu >= NR_CPUS || !cpu_online(cpu)) {
 619                         r = -EINVAL;
 620                         goto out;
 621                 }
 622         }
 623
 624         if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
 625                 /* don't care, or already on correct cpu */
 626                 sn_hwperf_call_sal(op_info);
 627         }
 628         else {
 629                 if (use_ipi) {
 630                         /* use an interprocessor interrupt to call SAL */
 631                         smp_call_function_single(cpu, sn_hwperf_call_sal,
 632                                 op_info, 1, 1);
 633                 }
 634                 else {
 635                         /* migrate the task before calling SAL */
 636                         save_allowed = current->cpus_allowed;
 637                         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 638                         sn_hwperf_call_sal(op_info);
 639                         set_cpus_allowed(current, save_allowed);
 640                 }
 641         }
 642         r = op_info->ret;
 643
 644 out:
 645         return r;
 646 }
 647
 648 /* map SAL hwperf error code to system error code */
 649 static int sn_hwperf_map_err(int hwperf_err)
 650 {
 651         int e;
 652
 653         switch(hwperf_err) {
 654         case SN_HWPERF_OP_OK:
 655                 e = 0;
 656                 break;
 657
 658         case SN_HWPERF_OP_NOMEM:
 659                 e = -ENOMEM;
 660                 break;
 661
 662         case SN_HWPERF_OP_NO_PERM:
 663                 e = -EPERM;
 664                 break;
 665
 666         case SN_HWPERF_OP_IO_ERROR:
 667                 e = -EIO;
 668                 break;
 669
 670         case SN_HWPERF_OP_BUSY:
 671                 e = -EBUSY;
 672                 break;
 673
 674         case SN_HWPERF_OP_RECONFIGURE:
 675                 e = -EAGAIN;
 676                 break;
 677
 678         case SN_HWPERF_OP_INVAL:
 679         default:
 680                 e = -EINVAL;
 681                 break;
 682         }
 683
 684         return e;
 685 }
 686
 687 /*
 688  * ioctl for "sn_hwperf" misc device
 689  */
 690 static int
 691 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 692 {
 693         struct sn_hwperf_ioctl_args a;
 694         struct cpuinfo_ia64 *cdata;
 695         struct sn_hwperf_object_info *objs;
 696         struct sn_hwperf_object_info *cpuobj;
 697         struct sn_hwperf_op_info op_info;
 698         void *p = NULL;
 699         int nobj;
 700         char slice;
 701         int node;
 702         int r;
 703         int v0;
 704         int i;
 705         int j;
 706
 707         unlock_kernel();
 708
 709         /* only user requests are allowed here */
 710         if ((op & SN_HWPERF_OP_MASK) < 10) {
 711                 r = -EINVAL;
 712                 goto error;
 713         }
 714         r = copy_from_user(&a, (const void __user *)arg,
 715                 sizeof(struct sn_hwperf_ioctl_args));
 716         if (r != 0) {
 717                 r = -EFAULT;
 718                 goto error;
 719         }
 720
 721         /*
 722          * Allocate memory to hold a kernel copy of the user buffer. The
 723          * buffer contents are either copied in or out (or both) of user
 724          * space depending on the flags encoded in the requested operation.
 725          */
 726         if (a.ptr) {
 727                 p = vmalloc(a.sz);
 728                 if (!p) {
 729                         r = -ENOMEM;
 730                         goto error;
 731                 }
 732         }
 733
 734         if (op & SN_HWPERF_OP_MEM_COPYIN) {
 735                 r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
 736                 if (r != 0) {
 737                         r = -EFAULT;
 738                         goto error;
 739                 }
 740         }
 741
 742         switch (op) {
 743         case SN_HWPERF_GET_CPU_INFO:
 744                 if (a.sz == sizeof(u64)) {
 745                         /* special case to get size needed */
 746                         *(u64 *) p = (u64) num_online_cpus() *
 747                                 sizeof(struct sn_hwperf_object_info);
 748                 } else
 749                 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
 750                         r = -ENOMEM;
 751                         goto error;
 752                 } else
 753                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 754                         int cpuobj_index = 0;
 755
 756                         memset(p, 0, a.sz);
 757                         for (i = 0; i < nobj; i++) {
 758                                 if (!SN_HWPERF_IS_NODE(objs + i))
 759                                         continue;
 760                                 node = sn_hwperf_obj_to_cnode(objs + i);
 761                                 for_each_online_cpu(j) {
 762                                         if (node != cpu_to_node(j))
 763                                                 continue;
 764                                         cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++;
 765                                         slice = 'a' + cpuid_to_slice(j);
 766                                         cdata = cpu_data(j);
 767                                         cpuobj->id = j;
 768                                         snprintf(cpuobj->name,
 769                                                  sizeof(cpuobj->name),
 770                                                  "CPU %luMHz %s",
 771                                                  cdata->proc_freq / 1000000,
 772                                                  cdata->vendor);
 773                                         snprintf(cpuobj->location,
 774                                                  sizeof(cpuobj->location),
 775                                                  "%s%c", objs[i].location,
 776                                                  slice);
 777                                 }
 778                         }
 779
 780                         vfree(objs);
 781                 }
 782                 break;
 783
 784         case SN_HWPERF_GET_NODE_NASID:
 785                 if (a.sz != sizeof(u64) ||
 786                    (node = a.arg) < 0 || !cnode_possible(node)) {
 787                         r = -EINVAL;
 788                         goto error;
 789                 }
 790                 *(u64 *)p = (u64)cnodeid_to_nasid(node);
 791                 break;
 792
 793         case SN_HWPERF_GET_OBJ_NODE:
 794                 if (a.sz != sizeof(u64) || a.arg < 0) {
 795                         r = -EINVAL;
 796                         goto error;
 797                 }
 798                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 799                         if (a.arg >= nobj) {
 800                                 r = -EINVAL;
 801                                 vfree(objs);
 802                                 goto error;
 803                         }
 804                         if (objs[(i = a.arg)].id != a.arg) {
 805                                 for (i = 0; i < nobj; i++) {
 806                                         if (objs[i].id == a.arg)
 807                                                 break;
 808                                 }
 809                         }
 810                         if (i == nobj) {
 811                                 r = -EINVAL;
 812                                 vfree(objs);
 813                                 goto error;
 814                         }
 815
 816                         if (!SN_HWPERF_IS_NODE(objs + i) &&
 817                             !SN_HWPERF_IS_IONODE(objs + i)) {
 818                                 r = -ENOENT;
 819                                 vfree(objs);
 820                                 goto error;
 821                         }
 822
 823                         *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
 824                         vfree(objs);
 825                 }
 826                 break;
 827
 828         case SN_HWPERF_GET_MMRS:
 829         case SN_HWPERF_SET_MMRS:
 830         case SN_HWPERF_OBJECT_DISTANCE:
 831                 op_info.p = p;
 832                 op_info.a = &a;
 833                 op_info.v0 = &v0;
 834                 op_info.op = op;
 835                 r = sn_hwperf_op_cpu(&op_info);
 836                 if (r) {
 837                         r = sn_hwperf_map_err(r);
 838                         a.v0 = v0;
 839                         goto error;
 840                 }
 841                 break;
 842
 843         default:
 844                 /* all other ops are a direct SAL call */
 845                 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
 846                               a.arg, a.sz, (u64) p, 0, 0, &v0);
 847                 if (r) {
 848                         r = sn_hwperf_map_err(r);
 849                         goto error;
 850                 }
 851                 a.v0 = v0;
 852                 break;
 853         }
 854
 855         if (op & SN_HWPERF_OP_MEM_COPYOUT) {
 856                 r = copy_to_user((void __user *)a.ptr, p, a.sz);
 857                 if (r != 0) {
 858                         r = -EFAULT;
 859                         goto error;
 860                 }
 861         }
 862
 863 error:
 864         vfree(p);
 865
 866         lock_kernel();
 867         return r;
 868 }
 869
 870 static const struct file_operations sn_hwperf_fops = {
 871         .ioctl = sn_hwperf_ioctl,
 872 };
 873
 874 static struct miscdevice sn_hwperf_dev = {
 875         MISC_DYNAMIC_MINOR,
 876         "sn_hwperf",
 877         &sn_hwperf_fops
 878 };
 879
 880 static int sn_hwperf_init(void)
 881 {
 882         u64 v;
 883         int salr;
 884         int e = 0;
 885
 886         /* single threaded, once-only initialization */
 887         mutex_lock(&sn_hwperf_init_mutex);
 888
 889         if (sn_hwperf_salheap) {
 890                 mutex_unlock(&sn_hwperf_init_mutex);
 891                 return e;
 892         }
 893
 894         /*
 895          * The PROM code needs a fixed reference node. For convenience the
 896          * same node as the console I/O is used.
 897          */
 898         sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
 899
 900         /*
 901          * Request the needed size and install the PROM scratch area.
 902          * The PROM keeps various tracking bits in this memory area.
 903          */
 904         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 905                                  (u64) SN_HWPERF_GET_HEAPSIZE, 0,
 906                                  (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
 907         if (salr != SN_HWPERF_OP_OK) {
 908                 e = -EINVAL;
 909                 goto out;
 910         }
 911
 912         if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
 913                 e = -ENOMEM;
 914                 goto out;
 915         }
 916         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 917                                  SN_HWPERF_INSTALL_HEAP, 0, v,
 918                                  (u64) sn_hwperf_salheap, 0, 0, NULL);
 919         if (salr != SN_HWPERF_OP_OK) {
 920                 e = -EINVAL;
 921                 goto out;
 922         }
 923
 924         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 925                                  SN_HWPERF_OBJECT_COUNT, 0,
 926                                  sizeof(u64), (u64) &v, 0, 0, NULL);
 927         if (salr != SN_HWPERF_OP_OK) {
 928                 e = -EINVAL;
 929                 goto out;
 930         }
 931         sn_hwperf_obj_cnt = (int)v;
 932
 933 out:
 934         if (e < 0 && sn_hwperf_salheap) {
 935                 vfree(sn_hwperf_salheap);
 936                 sn_hwperf_salheap = NULL;
 937                 sn_hwperf_obj_cnt = 0;
 938         }
 939         mutex_unlock(&sn_hwperf_init_mutex);
 940         return e;
 941 }
 942
 943 int sn_topology_open(struct inode *inode, struct file *file)
 944 {
 945         int e;
 946         struct seq_file *seq;
 947         struct sn_hwperf_object_info *objbuf;
 948         int nobj;
 949
 950         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 951                 e = seq_open(file, &sn_topology_seq_ops);
 952                 seq = file->private_data;
 953                 seq->private = objbuf;
 954         }
 955
 956         return e;
 957 }
 958
 959 int sn_topology_release(struct inode *inode, struct file *file)
 960 {
 961         struct seq_file *seq = file->private_data;
 962
 963         vfree(seq->private);
 964         return seq_release(inode, file);
 965 }
 966
 967 int sn_hwperf_get_nearest_node(cnodeid_t node,
 968         cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
 969 {
 970         int e;
 971         int nobj;
 972         struct sn_hwperf_object_info *objbuf;
 973
 974         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 975                 e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj,
 976                         node, near_mem_node, near_cpu_node);
 977                 vfree(objbuf);
 978         }
 979
 980         return e;
 981 }
 982
 983 static int __devinit sn_hwperf_misc_register_init(void)
 984 {
 985         int e;
 986
 987         if (!ia64_platform_is("sn2"))
 988                 return 0;
 989
 990         sn_hwperf_init();
 991
 992         /*
 993          * Register a dynamic misc device for hwperf ioctls. Platforms
 994          * supporting hotplug will create /dev/sn_hwperf, else user
 995          * can to look up the minor number in /proc/misc.
 996          */
 997         if ((e = misc_register(&sn_hwperf_dev)) != 0) {
 998                 printk(KERN_ERR "sn_hwperf_misc_register_init: failed to "
 999                 "register misc device for \"%s\"\n", sn_hwperf_dev.name);
1000         }
1001
1002         return e;
1003 }
1004
1005 device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */
1006 EXPORT_SYMBOL(sn_hwperf_get_nearest_node);