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/semaphore.h>
  41 #include <asm/uaccess.h>
  42 #include <asm/sal.h>
  43 #include <asm/sn/io.h>
  44 #include <asm/sn/sn_sal.h>
  45 #include <asm/sn/module.h>
  46 #include <asm/sn/geo.h>
  47 #include <asm/sn/sn2/sn_hwperf.h>
  48 #include <asm/sn/addrs.h>
  49
  50 static void *sn_hwperf_salheap = NULL;
  51 static int sn_hwperf_obj_cnt = 0;
  52 static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
  53 static int sn_hwperf_init(void);
  54 static DEFINE_MUTEX(sn_hwperf_init_mutex);
  55
  56 #define cnode_possible(n)       ((n) < num_cnodes)
  57
  58 static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
  59 {
  60         int e;
  61         u64 sz;
  62         struct sn_hwperf_object_info *objbuf = NULL;
  63
  64         if ((e = sn_hwperf_init()) < 0) {
  65                 printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e);
  66                 goto out;
  67         }
  68
  69         sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
  70         objbuf = vmalloc(sz);
  71         if (objbuf == NULL) {
  72                 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
  73                 e = -ENOMEM;
  74                 goto out;
  75         }
  76
  77         e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
  78                 0, sz, (u64) objbuf, 0, 0, NULL);
  79         if (e != SN_HWPERF_OP_OK) {
  80                 e = -EINVAL;
  81                 vfree(objbuf);
  82         }
  83
  84 out:
  85         *nobj = sn_hwperf_obj_cnt;
  86         *ret = objbuf;
  87         return e;
  88 }
  89
  90 static int sn_hwperf_location_to_bpos(char *location,
  91         int *rack, int *bay, int *slot, int *slab)
  92 {
  93         char type;
  94
  95         /* first scan for an old style geoid string */
  96         if (sscanf(location, "%03d%c%02d#%d",
  97                 rack, &type, bay, slab) == 4)
  98                 *slot = 0;
  99         else /* scan for a new bladed geoid string */
 100         if (sscanf(location, "%03d%c%02d^%02d#%d",
 101                 rack, &type, bay, slot, slab) != 5)
 102                 return -1;
 103         /* success */
 104         return 0;
 105 }
 106
 107 static int sn_hwperf_geoid_to_cnode(char *location)
 108 {
 109         int cnode;
 110         geoid_t geoid;
 111         moduleid_t module_id;
 112         int rack, bay, slot, slab;
 113         int this_rack, this_bay, this_slot, this_slab;
 114
 115         if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
 116                 return -1;
 117
 118         /*
 119          * FIXME: replace with cleaner for_each_XXX macro which addresses
 120          * both compute and IO nodes once ACPI3.0 is available.
 121          */
 122         for (cnode = 0; cnode < num_cnodes; cnode++) {
 123                 geoid = cnodeid_get_geoid(cnode);
 124                 module_id = geo_module(geoid);
 125                 this_rack = MODULE_GET_RACK(module_id);
 126                 this_bay = MODULE_GET_BPOS(module_id);
 127                 this_slot = geo_slot(geoid);
 128                 this_slab = geo_slab(geoid);
 129                 if (rack == this_rack && bay == this_bay &&
 130                         slot == this_slot && slab == this_slab) {
 131                         break;
 132                 }
 133         }
 134
 135         return cnode_possible(cnode) ? cnode : -1;
 136 }
 137
 138 static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
 139 {
 140         if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
 141                 BUG();
 142         if (SN_HWPERF_FOREIGN(obj))
 143                 return -1;
 144         return sn_hwperf_geoid_to_cnode(obj->location);
 145 }
 146
 147 static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
 148                                 struct sn_hwperf_object_info *objs)
 149 {
 150         int ordinal;
 151         struct sn_hwperf_object_info *p;
 152
 153         for (ordinal=0, p=objs; p != obj; p++) {
 154                 if (SN_HWPERF_FOREIGN(p))
 155                         continue;
 156                 if (SN_HWPERF_SAME_OBJTYPE(p, obj))
 157                         ordinal++;
 158         }
 159
 160         return ordinal;
 161 }
 162
 163 static const char *slabname_node =      "node"; /* SHub asic */
 164 static const char *slabname_ionode =    "ionode"; /* TIO asic */
 165 static const char *slabname_router =    "router"; /* NL3R or NL4R */
 166 static const char *slabname_other =     "other"; /* unknown asic */
 167
 168 static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj,
 169                         struct sn_hwperf_object_info *objs, int *ordinal)
 170 {
 171         int isnode;
 172         const char *slabname = slabname_other;
 173
 174         if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) {
 175                 slabname = isnode ? slabname_node : slabname_ionode;
 176                 *ordinal = sn_hwperf_obj_to_cnode(obj);
 177         }
 178         else {
 179                 *ordinal = sn_hwperf_generic_ordinal(obj, objs);
 180                 if (SN_HWPERF_IS_ROUTER(obj))
 181                         slabname = slabname_router;
 182         }
 183
 184         return slabname;
 185 }
 186
 187 static void print_pci_topology(struct seq_file *s)
 188 {
 189         char *p;
 190         size_t sz;
 191         int e;
 192
 193         for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
 194                 if (!(p = kmalloc(sz, GFP_KERNEL)))
 195                         break;
 196                 e = ia64_sn_ioif_get_pci_topology(__pa(p), sz);
 197                 if (e == SALRET_OK)
 198                         seq_puts(s, p);
 199                 kfree(p);
 200                 if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED)
 201                         break;
 202         }
 203 }
 204
 205 static inline int sn_hwperf_has_cpus(cnodeid_t node)
 206 {
 207         return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node);
 208 }
 209
 210 static inline int sn_hwperf_has_mem(cnodeid_t node)
 211 {
 212         return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages;
 213 }
 214
 215 static struct sn_hwperf_object_info *
 216 sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf,
 217         int nobj, int id)
 218 {
 219         int i;
 220         struct sn_hwperf_object_info *p = objbuf;
 221
 222         for (i=0; i < nobj; i++, p++) {
 223                 if (p->id == id)
 224                         return p;
 225         }
 226
 227         return NULL;
 228
 229 }
 230
 231 static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf,
 232         int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
 233 {
 234         int e;
 235         struct sn_hwperf_object_info *nodeobj = NULL;
 236         struct sn_hwperf_object_info *op;
 237         struct sn_hwperf_object_info *dest;
 238         struct sn_hwperf_object_info *router;
 239         struct sn_hwperf_port_info ptdata[16];
 240         int sz, i, j;
 241         cnodeid_t c;
 242         int found_mem = 0;
 243         int found_cpu = 0;
 244
 245         if (!cnode_possible(node))
 246                 return -EINVAL;
 247
 248         if (sn_hwperf_has_cpus(node)) {
 249                 if (near_cpu_node)
 250                         *near_cpu_node = node;
 251                 found_cpu++;
 252         }
 253
 254         if (sn_hwperf_has_mem(node)) {
 255                 if (near_mem_node)
 256                         *near_mem_node = node;
 257                 found_mem++;
 258         }
 259
 260         if (found_cpu && found_mem)
 261                 return 0; /* trivially successful */
 262
 263         /* find the argument node object */
 264         for (i=0, op=objbuf; i < nobj; i++, op++) {
 265                 if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op))
 266                         continue;
 267                 if (node == sn_hwperf_obj_to_cnode(op)) {
 268                         nodeobj = op;
 269                         break;
 270                 }
 271         }
 272         if (!nodeobj) {
 273                 e = -ENOENT;
 274                 goto err;
 275         }
 276
 277         /* get it's interconnect topology */
 278         sz = op->ports * sizeof(struct sn_hwperf_port_info);
 279         if (sz > sizeof(ptdata))
 280                 BUG();
 281         e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 282                               SN_HWPERF_ENUM_PORTS, nodeobj->id, sz,
 283                               (u64)&ptdata, 0, 0, NULL);
 284         if (e != SN_HWPERF_OP_OK) {
 285                 e = -EINVAL;
 286                 goto err;
 287         }
 288
 289         /* find nearest node with cpus and nearest memory */
 290         for (router=NULL, j=0; j < op->ports; j++) {
 291                 dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id);
 292                 if (dest && SN_HWPERF_IS_ROUTER(dest))
 293                         router = dest;
 294                 if (!dest || SN_HWPERF_FOREIGN(dest) ||
 295                     !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) {
 296                         continue;
 297                 }
 298                 c = sn_hwperf_obj_to_cnode(dest);
 299                 if (!found_cpu && sn_hwperf_has_cpus(c)) {
 300                         if (near_cpu_node)
 301                                 *near_cpu_node = c;
 302                         found_cpu++;
 303                 }
 304                 if (!found_mem && sn_hwperf_has_mem(c)) {
 305                         if (near_mem_node)
 306                                 *near_mem_node = c;
 307                         found_mem++;
 308                 }
 309         }
 310
 311         if (router && (!found_cpu || !found_mem)) {
 312                 /* search for a node connected to the same router */
 313                 sz = router->ports * sizeof(struct sn_hwperf_port_info);
 314                 if (sz > sizeof(ptdata))
 315                         BUG();
 316                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 317                                       SN_HWPERF_ENUM_PORTS, router->id, sz,
 318                                       (u64)&ptdata, 0, 0, NULL);
 319                 if (e != SN_HWPERF_OP_OK) {
 320                         e = -EINVAL;
 321                         goto err;
 322                 }
 323                 for (j=0; j < router->ports; j++) {
 324                         dest = sn_hwperf_findobj_id(objbuf, nobj,
 325                                 ptdata[j].conn_id);
 326                         if (!dest || dest->id == node ||
 327                             SN_HWPERF_FOREIGN(dest) ||
 328                             !SN_HWPERF_IS_NODE(dest) ||
 329                             SN_HWPERF_IS_IONODE(dest)) {
 330                                 continue;
 331                         }
 332                         c = sn_hwperf_obj_to_cnode(dest);
 333                         if (!found_cpu && sn_hwperf_has_cpus(c)) {
 334                                 if (near_cpu_node)
 335                                         *near_cpu_node = c;
 336                                 found_cpu++;
 337                         }
 338                         if (!found_mem && sn_hwperf_has_mem(c)) {
 339                                 if (near_mem_node)
 340                                         *near_mem_node = c;
 341                                 found_mem++;
 342                         }
 343                         if (found_cpu && found_mem)
 344                                 break;
 345                 }
 346         }
 347
 348         if (!found_cpu || !found_mem) {
 349                 /* resort to _any_ node with CPUs and memory */
 350                 for (i=0, op=objbuf; i < nobj; i++, op++) {
 351                         if (SN_HWPERF_FOREIGN(op) ||
 352                             SN_HWPERF_IS_IONODE(op) ||
 353                             !SN_HWPERF_IS_NODE(op)) {
 354                                 continue;
 355                         }
 356                         c = sn_hwperf_obj_to_cnode(op);
 357                         if (!found_cpu && sn_hwperf_has_cpus(c)) {
 358                                 if (near_cpu_node)
 359                                         *near_cpu_node = c;
 360                                 found_cpu++;
 361                         }
 362                         if (!found_mem && sn_hwperf_has_mem(c)) {
 363                                 if (near_mem_node)
 364                                         *near_mem_node = c;
 365                                 found_mem++;
 366                         }
 367                         if (found_cpu && found_mem)
 368                                 break;
 369                 }
 370         }
 371
 372         if (!found_cpu || !found_mem)
 373                 e = -ENODATA;
 374
 375 err:
 376         return e;
 377 }
 378
 379
 380 static int sn_topology_show(struct seq_file *s, void *d)
 381 {
 382         int sz;
 383         int pt;
 384         int e = 0;
 385         int i;
 386         int j;
 387         const char *slabname;
 388         int ordinal;
 389         cpumask_t cpumask;
 390         char slice;
 391         struct cpuinfo_ia64 *c;
 392         struct sn_hwperf_port_info *ptdata;
 393         struct sn_hwperf_object_info *p;
 394         struct sn_hwperf_object_info *obj = d;  /* this object */
 395         struct sn_hwperf_object_info *objs = s->private; /* all objects */
 396         u8 shubtype;
 397         u8 system_size;
 398         u8 sharing_size;
 399         u8 partid;
 400         u8 coher;
 401         u8 nasid_shift;
 402         u8 region_size;
 403         u16 nasid_mask;
 404         int nasid_msb;
 405
 406         if (obj == objs) {
 407                 seq_printf(s, "# sn_topology version 2\n");
 408                 seq_printf(s, "# objtype ordinal location partition"
 409                         " [attribute value [, ...]]\n");
 410
 411                 if (ia64_sn_get_sn_info(0,
 412                         &shubtype, &nasid_mask, &nasid_shift, &system_size,
 413                         &sharing_size, &partid, &coher, &region_size))
 414                         BUG();
 415                 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
 416                         if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
 417                                 break;
 418                 }
 419                 seq_printf(s, "partition %u %s local "
 420                         "shubtype %s, "
 421                         "nasid_mask 0x%016lx, "
 422                         "nasid_bits %d:%d, "
 423                         "system_size %d, "
 424                         "sharing_size %d, "
 425                         "coherency_domain %d, "
 426                         "region_size %d\n",
 427
 428                         partid, utsname()->nodename,
 429                         shubtype ? "shub2" : "shub1",
 430                         (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
 431                         system_size, sharing_size, coher, region_size);
 432
 433                 print_pci_topology(s);
 434         }
 435
 436         if (SN_HWPERF_FOREIGN(obj)) {
 437                 /* private in another partition: not interesting */
 438                 return 0;
 439         }
 440
 441         for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
 442                 if (obj->name[i] == ' ')
 443                         obj->name[i] = '_';
 444         }
 445
 446         slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
 447         seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
 448                 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
 449
 450         if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)))
 451                 seq_putc(s, '\n');
 452         else {
 453                 cnodeid_t near_mem = -1;
 454                 cnodeid_t near_cpu = -1;
 455
 456                 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
 457
 458                 if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt,
 459                         ordinal, &near_mem, &near_cpu) == 0) {
 460                         seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d",
 461                                 near_mem, near_cpu);
 462                 }
 463
 464                 if (!SN_HWPERF_IS_IONODE(obj)) {
 465                         for_each_online_node(i) {
 466                                 seq_printf(s, i ? ":%d" : ", dist %d",
 467                                         node_distance(ordinal, i));
 468                         }
 469                 }
 470
 471                 seq_putc(s, '\n');
 472
 473                 /*
 474                  * CPUs on this node, if any
 475                  */
 476                 if (!SN_HWPERF_IS_IONODE(obj)) {
 477                         cpumask = node_to_cpumask(ordinal);
 478                         for_each_online_cpu(i) {
 479                                 if (cpu_isset(i, cpumask)) {
 480                                         slice = 'a' + cpuid_to_slice(i);
 481                                         c = cpu_data(i);
 482                                         seq_printf(s, "cpu %d %s%c local"
 483                                                 " freq %luMHz, arch ia64",
 484                                                 i, obj->location, slice,
 485                                                 c->proc_freq / 1000000);
 486                                         for_each_online_cpu(j) {
 487                                                 seq_printf(s, j ? ":%d" : ", dist %d",
 488                                                         node_distance(
 489                                                         cpu_to_node(i),
 490                                                         cpu_to_node(j)));
 491                                         }
 492                                         seq_putc(s, '\n');
 493                                 }
 494                         }
 495                 }
 496         }
 497
 498         if (obj->ports) {
 499                 /*
 500                  * numalink ports
 501                  */
 502                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
 503                 if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
 504                         return -ENOMEM;
 505                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 506                                       SN_HWPERF_ENUM_PORTS, obj->id, sz,
 507                                       (u64) ptdata, 0, 0, NULL);
 508                 if (e != SN_HWPERF_OP_OK)
 509                         return -EINVAL;
 510                 for (ordinal=0, p=objs; p != obj; p++) {
 511                         if (!SN_HWPERF_FOREIGN(p))
 512                                 ordinal += p->ports;
 513                 }
 514                 for (pt = 0; pt < obj->ports; pt++) {
 515                         for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
 516                                 if (ptdata[pt].conn_id == p->id) {
 517                                         break;
 518                                 }
 519                         }
 520                         seq_printf(s, "numalink %d %s-%d",
 521                             ordinal+pt, obj->location, ptdata[pt].port);
 522
 523                         if (i >= sn_hwperf_obj_cnt) {
 524                                 /* no connection */
 525                                 seq_puts(s, " local endpoint disconnected"
 526                                             ", protocol unknown\n");
 527                                 continue;
 528                         }
 529
 530                         if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
 531                                 /* both ends local to this partition */
 532                                 seq_puts(s, " local");
 533                         else if (SN_HWPERF_FOREIGN(p))
 534                                 /* both ends of the link in foreign partiton */
 535                                 seq_puts(s, " foreign");
 536                         else
 537                                 /* link straddles a partition */
 538                                 seq_puts(s, " shared");
 539
 540                         /*
 541                          * Unlikely, but strictly should query the LLP config
 542                          * registers because an NL4R can be configured to run
 543                          * NL3 protocol, even when not talking to an NL3 router.
 544                          * Ditto for node-node.
 545                          */
 546                         seq_printf(s, " endpoint %s-%d, protocol %s\n",
 547                                 p->location, ptdata[pt].conn_port,
 548                                 (SN_HWPERF_IS_NL3ROUTER(obj) ||
 549                                 SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
 550                 }
 551                 kfree(ptdata);
 552         }
 553
 554         return 0;
 555 }
 556
 557 static void *sn_topology_start(struct seq_file *s, loff_t * pos)
 558 {
 559         struct sn_hwperf_object_info *objs = s->private;
 560
 561         if (*pos < sn_hwperf_obj_cnt)
 562                 return (void *)(objs + *pos);
 563
 564         return NULL;
 565 }
 566
 567 static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
 568 {
 569         ++*pos;
 570         return sn_topology_start(s, pos);
 571 }
 572
 573 static void sn_topology_stop(struct seq_file *m, void *v)
 574 {
 575         return;
 576 }
 577
 578 /*
 579  * /proc/sgi_sn/sn_topology, read-only using seq_file
 580  */
 581 static const struct seq_operations sn_topology_seq_ops = {
 582         .start = sn_topology_start,
 583         .next = sn_topology_next,
 584         .stop = sn_topology_stop,
 585         .show = sn_topology_show
 586 };
 587
 588 struct sn_hwperf_op_info {
 589         u64 op;
 590         struct sn_hwperf_ioctl_args *a;
 591         void *p;
 592         int *v0;
 593         int ret;
 594 };
 595
 596 static void sn_hwperf_call_sal(void *info)
 597 {
 598         struct sn_hwperf_op_info *op_info = info;
 599         int r;
 600
 601         r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
 602                       op_info->a->arg, op_info->a->sz,
 603                       (u64) op_info->p, 0, 0, op_info->v0);
 604         op_info->ret = r;
 605 }
 606
 607 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
 608 {
 609         u32 cpu;
 610         u32 use_ipi;
 611         int r = 0;
 612         cpumask_t save_allowed;
 613
 614         cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
 615         use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
 616         op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
 617
 618         if (cpu != SN_HWPERF_ARG_ANY_CPU) {
 619                 if (cpu >= NR_CPUS || !cpu_online(cpu)) {
 620                         r = -EINVAL;
 621                         goto out;
 622                 }
 623         }
 624
 625         if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
 626                 /* don't care, or already on correct cpu */
 627                 sn_hwperf_call_sal(op_info);
 628         }
 629         else {
 630                 if (use_ipi) {
 631                         /* use an interprocessor interrupt to call SAL */
 632                         smp_call_function_single(cpu, sn_hwperf_call_sal,
 633                                 op_info, 1, 1);
 634                 }
 635                 else {
 636                         /* migrate the task before calling SAL */
 637                         save_allowed = current->cpus_allowed;
 638                         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 639                         sn_hwperf_call_sal(op_info);
 640                         set_cpus_allowed(current, save_allowed);
 641                 }
 642         }
 643         r = op_info->ret;
 644
 645 out:
 646         return r;
 647 }
 648
 649 /* map SAL hwperf error code to system error code */
 650 static int sn_hwperf_map_err(int hwperf_err)
 651 {
 652         int e;
 653
 654         switch(hwperf_err) {
 655         case SN_HWPERF_OP_OK:
 656                 e = 0;
 657                 break;
 658
 659         case SN_HWPERF_OP_NOMEM:
 660                 e = -ENOMEM;
 661                 break;
 662
 663         case SN_HWPERF_OP_NO_PERM:
 664                 e = -EPERM;
 665                 break;
 666
 667         case SN_HWPERF_OP_IO_ERROR:
 668                 e = -EIO;
 669                 break;
 670
 671         case SN_HWPERF_OP_BUSY:
 672                 e = -EBUSY;
 673                 break;
 674
 675         case SN_HWPERF_OP_RECONFIGURE:
 676                 e = -EAGAIN;
 677                 break;
 678
 679         case SN_HWPERF_OP_INVAL:
 680         default:
 681                 e = -EINVAL;
 682                 break;
 683         }
 684
 685         return e;
 686 }
 687
 688 /*
 689  * ioctl for "sn_hwperf" misc device
 690  */
 691 static int
 692 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 693 {
 694         struct sn_hwperf_ioctl_args a;
 695         struct cpuinfo_ia64 *cdata;
 696         struct sn_hwperf_object_info *objs;
 697         struct sn_hwperf_object_info *cpuobj;
 698         struct sn_hwperf_op_info op_info;
 699         void *p = NULL;
 700         int nobj;
 701         char slice;
 702         int node;
 703         int r;
 704         int v0;
 705         int i;
 706         int j;
 707
 708         unlock_kernel();
 709
 710         /* only user requests are allowed here */
 711         if ((op & SN_HWPERF_OP_MASK) < 10) {
 712                 r = -EINVAL;
 713                 goto error;
 714         }
 715         r = copy_from_user(&a, (const void __user *)arg,
 716                 sizeof(struct sn_hwperf_ioctl_args));
 717         if (r != 0) {
 718                 r = -EFAULT;
 719                 goto error;
 720         }
 721
 722         /*
 723          * Allocate memory to hold a kernel copy of the user buffer. The
 724          * buffer contents are either copied in or out (or both) of user
 725          * space depending on the flags encoded in the requested operation.
 726          */
 727         if (a.ptr) {
 728                 p = vmalloc(a.sz);
 729                 if (!p) {
 730                         r = -ENOMEM;
 731                         goto error;
 732                 }
 733         }
 734
 735         if (op & SN_HWPERF_OP_MEM_COPYIN) {
 736                 r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
 737                 if (r != 0) {
 738                         r = -EFAULT;
 739                         goto error;
 740                 }
 741         }
 742
 743         switch (op) {
 744         case SN_HWPERF_GET_CPU_INFO:
 745                 if (a.sz == sizeof(u64)) {
 746                         /* special case to get size needed */
 747                         *(u64 *) p = (u64) num_online_cpus() *
 748                                 sizeof(struct sn_hwperf_object_info);
 749                 } else
 750                 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
 751                         r = -ENOMEM;
 752                         goto error;
 753                 } else
 754                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 755                         int cpuobj_index = 0;
 756
 757                         memset(p, 0, a.sz);
 758                         for (i = 0; i < nobj; i++) {
 759                                 if (!SN_HWPERF_IS_NODE(objs + i))
 760                                         continue;
 761                                 node = sn_hwperf_obj_to_cnode(objs + i);
 762                                 for_each_online_cpu(j) {
 763                                         if (node != cpu_to_node(j))
 764                                                 continue;
 765                                         cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++;
 766                                         slice = 'a' + cpuid_to_slice(j);
 767                                         cdata = cpu_data(j);
 768                                         cpuobj->id = j;
 769                                         snprintf(cpuobj->name,
 770                                                  sizeof(cpuobj->name),
 771                                                  "CPU %luMHz %s",
 772                                                  cdata->proc_freq / 1000000,
 773                                                  cdata->vendor);
 774                                         snprintf(cpuobj->location,
 775                                                  sizeof(cpuobj->location),
 776                                                  "%s%c", objs[i].location,
 777                                                  slice);
 778                                 }
 779                         }
 780
 781                         vfree(objs);
 782                 }
 783                 break;
 784
 785         case SN_HWPERF_GET_NODE_NASID:
 786                 if (a.sz != sizeof(u64) ||
 787                    (node = a.arg) < 0 || !cnode_possible(node)) {
 788                         r = -EINVAL;
 789                         goto error;
 790                 }
 791                 *(u64 *)p = (u64)cnodeid_to_nasid(node);
 792                 break;
 793
 794         case SN_HWPERF_GET_OBJ_NODE:
 795                 if (a.sz != sizeof(u64) || a.arg < 0) {
 796                         r = -EINVAL;
 797                         goto error;
 798                 }
 799                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 800                         if (a.arg >= nobj) {
 801                                 r = -EINVAL;
 802                                 vfree(objs);
 803                                 goto error;
 804                         }
 805                         if (objs[(i = a.arg)].id != a.arg) {
 806                                 for (i = 0; i < nobj; i++) {
 807                                         if (objs[i].id == a.arg)
 808                                                 break;
 809                                 }
 810                         }
 811                         if (i == nobj) {
 812                                 r = -EINVAL;
 813                                 vfree(objs);
 814                                 goto error;
 815                         }
 816
 817                         if (!SN_HWPERF_IS_NODE(objs + i) &&
 818                             !SN_HWPERF_IS_IONODE(objs + i)) {
 819                                 r = -ENOENT;
 820                                 vfree(objs);
 821                                 goto error;
 822                         }
 823
 824                         *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
 825                         vfree(objs);
 826                 }
 827                 break;
 828
 829         case SN_HWPERF_GET_MMRS:
 830         case SN_HWPERF_SET_MMRS:
 831         case SN_HWPERF_OBJECT_DISTANCE:
 832                 op_info.p = p;
 833                 op_info.a = &a;
 834                 op_info.v0 = &v0;
 835                 op_info.op = op;
 836                 r = sn_hwperf_op_cpu(&op_info);
 837                 if (r) {
 838                         r = sn_hwperf_map_err(r);
 839                         a.v0 = v0;
 840                         goto error;
 841                 }
 842                 break;
 843
 844         default:
 845                 /* all other ops are a direct SAL call */
 846                 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
 847                               a.arg, a.sz, (u64) p, 0, 0, &v0);
 848                 if (r) {
 849                         r = sn_hwperf_map_err(r);
 850                         goto error;
 851                 }
 852                 a.v0 = v0;
 853                 break;
 854         }
 855
 856         if (op & SN_HWPERF_OP_MEM_COPYOUT) {
 857                 r = copy_to_user((void __user *)a.ptr, p, a.sz);
 858                 if (r != 0) {
 859                         r = -EFAULT;
 860                         goto error;
 861                 }
 862         }
 863
 864 error:
 865         vfree(p);
 866
 867         lock_kernel();
 868         return r;
 869 }
 870
 871 static const struct file_operations sn_hwperf_fops = {
 872         .ioctl = sn_hwperf_ioctl,
 873 };
 874
 875 static struct miscdevice sn_hwperf_dev = {
 876         MISC_DYNAMIC_MINOR,
 877         "sn_hwperf",
 878         &sn_hwperf_fops
 879 };
 880
 881 static int sn_hwperf_init(void)
 882 {
 883         u64 v;
 884         int salr;
 885         int e = 0;
 886
 887         /* single threaded, once-only initialization */
 888         mutex_lock(&sn_hwperf_init_mutex);
 889
 890         if (sn_hwperf_salheap) {
 891                 mutex_unlock(&sn_hwperf_init_mutex);
 892                 return e;
 893         }
 894
 895         /*
 896          * The PROM code needs a fixed reference node. For convenience the
 897          * same node as the console I/O is used.
 898          */
 899         sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
 900
 901         /*
 902          * Request the needed size and install the PROM scratch area.
 903          * The PROM keeps various tracking bits in this memory area.
 904          */
 905         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 906                                  (u64) SN_HWPERF_GET_HEAPSIZE, 0,
 907                                  (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
 908         if (salr != SN_HWPERF_OP_OK) {
 909                 e = -EINVAL;
 910                 goto out;
 911         }
 912
 913         if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
 914                 e = -ENOMEM;
 915                 goto out;
 916         }
 917         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 918                                  SN_HWPERF_INSTALL_HEAP, 0, v,
 919                                  (u64) sn_hwperf_salheap, 0, 0, NULL);
 920         if (salr != SN_HWPERF_OP_OK) {
 921                 e = -EINVAL;
 922                 goto out;
 923         }
 924
 925         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 926                                  SN_HWPERF_OBJECT_COUNT, 0,
 927                                  sizeof(u64), (u64) &v, 0, 0, NULL);
 928         if (salr != SN_HWPERF_OP_OK) {
 929                 e = -EINVAL;
 930                 goto out;
 931         }
 932         sn_hwperf_obj_cnt = (int)v;
 933
 934 out:
 935         if (e < 0 && sn_hwperf_salheap) {
 936                 vfree(sn_hwperf_salheap);
 937                 sn_hwperf_salheap = NULL;
 938                 sn_hwperf_obj_cnt = 0;
 939         }
 940         mutex_unlock(&sn_hwperf_init_mutex);
 941         return e;
 942 }
 943
 944 int sn_topology_open(struct inode *inode, struct file *file)
 945 {
 946         int e;
 947         struct seq_file *seq;
 948         struct sn_hwperf_object_info *objbuf;
 949         int nobj;
 950
 951         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 952                 e = seq_open(file, &sn_topology_seq_ops);
 953                 seq = file->private_data;
 954                 seq->private = objbuf;
 955         }
 956
 957         return e;
 958 }
 959
 960 int sn_topology_release(struct inode *inode, struct file *file)
 961 {
 962         struct seq_file *seq = file->private_data;
 963
 964         vfree(seq->private);
 965         return seq_release(inode, file);
 966 }
 967
 968 int sn_hwperf_get_nearest_node(cnodeid_t node,
 969         cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
 970 {
 971         int e;
 972         int nobj;
 973         struct sn_hwperf_object_info *objbuf;
 974
 975         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 976                 e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj,
 977                         node, near_mem_node, near_cpu_node);
 978                 vfree(objbuf);
 979         }
 980
 981         return e;
 982 }
 983
 984 static int __devinit sn_hwperf_misc_register_init(void)
 985 {
 986         int e;
 987
 988         if (!ia64_platform_is("sn2"))
 989                 return 0;
 990
 991         sn_hwperf_init();
 992
 993         /*
 994          * Register a dynamic misc device for hwperf ioctls. Platforms
 995          * supporting hotplug will create /dev/sn_hwperf, else user
 996          * can to look up the minor number in /proc/misc.
 997          */
 998         if ((e = misc_register(&sn_hwperf_dev)) != 0) {
 999                 printk(KERN_ERR "sn_hwperf_misc_register_init: failed to "
1000                 "register misc device for \"%s\"\n", sn_hwperf_dev.name);
1001         }
1002
1003         return e;
1004 }
1005
1006 device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */
1007 EXPORT_SYMBOL(sn_hwperf_get_nearest_node);