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