arch/ia64/sn/kernel/sn2/sn_hwperf.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2004-2005 Silicon Graphics, Inc. All rights reserved.
   7  *
   8  * SGI Altix topology and hardware performance monitoring API.
   9  * Mark Goodwin <markgw@sgi.com>.
  10  *
  11  * Creates /proc/sgi_sn/sn_topology (read-only) to export
  12  * info about Altix nodes, routers, CPUs and NumaLink
  13  * interconnection/topology.
  14  *
  15  * Also creates a dynamic misc device named "sn_hwperf"
  16  * that supports an ioctl interface to call down into SAL
  17  * to discover hw objects, topology and to read/write
  18  * memory mapped registers, e.g. for performance monitoring.
  19  * The "sn_hwperf" device is registered only after the procfs
  20  * file is first opened, i.e. only if/when it's needed.
  21  *
  22  * This API is used by SGI Performance Co-Pilot and other
  23  * tools, see http://oss.sgi.com/projects/pcp
  24  */
  25
  26 #include <linux/fs.h>
  27 #include <linux/slab.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/seq_file.h>
  30 #include <linux/miscdevice.h>
  31 #include <linux/utsname.h>
  32 #include <linux/cpumask.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/nodemask.h>
  35 #include <asm/processor.h>
  36 #include <asm/topology.h>
  37 #include <asm/smp.h>
  38 #include <asm/semaphore.h>
  39 #include <asm/segment.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 static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
  56 {
  57         int e;
  58         u64 sz;
  59         struct sn_hwperf_object_info *objbuf = NULL;
  60
  61         if ((e = sn_hwperf_init()) < 0) {
  62                 printk("sn_hwperf_init failed: err %d\n", e);
  63                 goto out;
  64         }
  65
  66         sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
  67         if ((objbuf = (struct sn_hwperf_object_info *) vmalloc(sz)) == NULL) {
  68                 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
  69                 e = -ENOMEM;
  70                 goto out;
  71         }
  72
  73         e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
  74                 0, sz, (u64) objbuf, 0, 0, NULL);
  75         if (e != SN_HWPERF_OP_OK) {
  76                 e = -EINVAL;
  77                 vfree(objbuf);
  78         }
  79
  80 out:
  81         *nobj = sn_hwperf_obj_cnt;
  82         *ret = objbuf;
  83         return e;
  84 }
  85
  86 static int sn_hwperf_location_to_bpos(char *location,
  87         int *rack, int *bay, int *slot, int *slab)
  88 {
  89         char type;
  90
  91         /* first scan for an old style geoid string */
  92         if (sscanf(location, "%03d%c%02d#%d",
  93                 rack, &type, bay, slab) == 4)
  94                 *slot = 0;
  95         else /* scan for a new bladed geoid string */
  96         if (sscanf(location, "%03d%c%02d^%02d#%d",
  97                 rack, &type, bay, slot, slab) != 5)
  98                 return -1;
  99         /* success */
 100         return 0;
 101 }
 102
 103 static int sn_hwperf_geoid_to_cnode(char *location)
 104 {
 105         int cnode;
 106         geoid_t geoid;
 107         moduleid_t module_id;
 108         int rack, bay, slot, slab;
 109         int this_rack, this_bay, this_slot, this_slab;
 110
 111         if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
 112                 return -1;
 113
 114         for (cnode = 0; cnode < numionodes; cnode++) {
 115                 geoid = cnodeid_get_geoid(cnode);
 116                 module_id = geo_module(geoid);
 117                 this_rack = MODULE_GET_RACK(module_id);
 118                 this_bay = MODULE_GET_BPOS(module_id);
 119                 this_slot = geo_slot(geoid);
 120                 this_slab = geo_slab(geoid);
 121                 if (rack == this_rack && bay == this_bay &&
 122                         slot == this_slot && slab == this_slab) {
 123                         break;
 124                 }
 125         }
 126
 127         return cnode < numionodes ? cnode : -1;
 128 }
 129
 130 static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
 131 {
 132         if (!obj->sn_hwp_this_part)
 133                 return -1;
 134         return sn_hwperf_geoid_to_cnode(obj->location);
 135 }
 136
 137 static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
 138                                 struct sn_hwperf_object_info *objs)
 139 {
 140         int ordinal;
 141         struct sn_hwperf_object_info *p;
 142
 143         for (ordinal=0, p=objs; p != obj; p++) {
 144                 if (SN_HWPERF_FOREIGN(p))
 145                         continue;
 146                 if (SN_HWPERF_SAME_OBJTYPE(p, obj))
 147                         ordinal++;
 148         }
 149
 150         return ordinal;
 151 }
 152
 153 static const char *slabname_node =      "node"; /* SHub asic */
 154 static const char *slabname_ionode =    "ionode"; /* TIO asic */
 155 static const char *slabname_router =    "router"; /* NL3R or NL4R */
 156 static const char *slabname_other =     "other"; /* unknown asic */
 157
 158 static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj,
 159                         struct sn_hwperf_object_info *objs, int *ordinal)
 160 {
 161         int isnode;
 162         const char *slabname = slabname_other;
 163
 164         if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) {
 165                 slabname = isnode ? slabname_node : slabname_ionode;
 166                 *ordinal = sn_hwperf_obj_to_cnode(obj);
 167         }
 168         else {
 169                 *ordinal = sn_hwperf_generic_ordinal(obj, objs);
 170                 if (SN_HWPERF_IS_ROUTER(obj))
 171                         slabname = slabname_router;
 172         }
 173
 174         return slabname;
 175 }
 176
 177 static void print_pci_topology(struct seq_file *s,
 178         struct sn_hwperf_object_info *obj, int *ordinal,
 179         u64 rack, u64 bay, u64 slot, u64 slab)
 180 {
 181         char *p1;
 182         char *p2;
 183         char *pg;
 184
 185         if (!(pg = (char *)get_zeroed_page(GFP_KERNEL)))
 186                 return; /* ignore */
 187         if (ia64_sn_ioif_get_pci_topology(rack, bay, slot, slab,
 188                 __pa(pg), PAGE_SIZE) == SN_HWPERF_OP_OK) {
 189                 for (p1=pg; *p1 && p1 < pg + PAGE_SIZE;) {
 190                         if (!(p2 = strchr(p1, '\n')))
 191                                 break;
 192                         *p2 = '\0';
 193                         seq_printf(s, "pcibus %d %s-%s\n",
 194                                 *ordinal, obj->location, p1);
 195                         (*ordinal)++;
 196                         p1 = p2 + 1;
 197                 }
 198         }
 199         free_page((unsigned long)pg);
 200 }
 201
 202 static int sn_topology_show(struct seq_file *s, void *d)
 203 {
 204         int sz;
 205         int pt;
 206         int e = 0;
 207         int i;
 208         int j;
 209         const char *slabname;
 210         int ordinal;
 211         cpumask_t cpumask;
 212         char slice;
 213         struct cpuinfo_ia64 *c;
 214         struct sn_hwperf_port_info *ptdata;
 215         struct sn_hwperf_object_info *p;
 216         struct sn_hwperf_object_info *obj = d;  /* this object */
 217         struct sn_hwperf_object_info *objs = s->private; /* all objects */
 218         int rack, bay, slot, slab;
 219         u8 shubtype;
 220         u8 system_size;
 221         u8 sharing_size;
 222         u8 partid;
 223         u8 coher;
 224         u8 nasid_shift;
 225         u8 region_size;
 226         u16 nasid_mask;
 227         int nasid_msb;
 228         int pci_bus_ordinal = 0;
 229
 230         if (obj == objs) {
 231                 seq_printf(s, "# sn_topology version 2\n");
 232                 seq_printf(s, "# objtype ordinal location partition"
 233                         " [attribute value [, ...]]\n");
 234
 235                 if (ia64_sn_get_sn_info(0,
 236                         &shubtype, &nasid_mask, &nasid_shift, &system_size,
 237                         &sharing_size, &partid, &coher, &region_size))
 238                         BUG();
 239                 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
 240                         if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
 241                                 break;
 242                 }
 243                 seq_printf(s, "partition %u %s local "
 244                         "shubtype %s, "
 245                         "nasid_mask 0x%016lx, "
 246                         "nasid_bits %d:%d, "
 247                         "system_size %d, "
 248                         "sharing_size %d, "
 249                         "coherency_domain %d, "
 250                         "region_size %d\n",
 251
 252                         partid, system_utsname.nodename,
 253                         shubtype ? "shub2" : "shub1",
 254                         (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
 255                         system_size, sharing_size, coher, region_size);
 256         }
 257
 258         if (SN_HWPERF_FOREIGN(obj)) {
 259                 /* private in another partition: not interesting */
 260                 return 0;
 261         }
 262
 263         for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
 264                 if (obj->name[i] == ' ')
 265                         obj->name[i] = '_';
 266         }
 267
 268         slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
 269         seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
 270                 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
 271
 272         if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
 273                 seq_putc(s, '\n');
 274         else {
 275                 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
 276                 for (i=0; i < numionodes; i++) {
 277                         seq_printf(s, i ? ":%d" : ", dist %d",
 278                                 node_distance(ordinal, i));
 279                 }
 280                 seq_putc(s, '\n');
 281
 282                 /*
 283                  * CPUs on this node, if any
 284                  */
 285                 cpumask = node_to_cpumask(ordinal);
 286                 for_each_online_cpu(i) {
 287                         if (cpu_isset(i, cpumask)) {
 288                                 slice = 'a' + cpuid_to_slice(i);
 289                                 c = cpu_data(i);
 290                                 seq_printf(s, "cpu %d %s%c local"
 291                                         " freq %luMHz, arch ia64",
 292                                         i, obj->location, slice,
 293                                         c->proc_freq / 1000000);
 294                                 for_each_online_cpu(j) {
 295                                         seq_printf(s, j ? ":%d" : ", dist %d",
 296                                                 node_distance(
 297                                                     cpuid_to_cnodeid(i),
 298                                                     cpuid_to_cnodeid(j)));
 299                                 }
 300                                 seq_putc(s, '\n');
 301                         }
 302                 }
 303
 304                 /*
 305                  * PCI busses attached to this node, if any
 306                  */
 307                 if (sn_hwperf_location_to_bpos(obj->location,
 308                         &rack, &bay, &slot, &slab)) {
 309                         /* export pci bus info */
 310                         print_pci_topology(s, obj, &pci_bus_ordinal,
 311                                 rack, bay, slot, slab);
 312
 313                 }
 314         }
 315
 316         if (obj->ports) {
 317                 /*
 318                  * numalink ports
 319                  */
 320                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
 321                 if ((ptdata = vmalloc(sz)) == NULL)
 322                         return -ENOMEM;
 323                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 324                                       SN_HWPERF_ENUM_PORTS, obj->id, sz,
 325                                       (u64) ptdata, 0, 0, NULL);
 326                 if (e != SN_HWPERF_OP_OK)
 327                         return -EINVAL;
 328                 for (ordinal=0, p=objs; p != obj; p++) {
 329                         if (!SN_HWPERF_FOREIGN(p))
 330                                 ordinal += p->ports;
 331                 }
 332                 for (pt = 0; pt < obj->ports; pt++) {
 333                         for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
 334                                 if (ptdata[pt].conn_id == p->id) {
 335                                         break;
 336                                 }
 337                         }
 338                         seq_printf(s, "numalink %d %s-%d",
 339                             ordinal+pt, obj->location, ptdata[pt].port);
 340
 341                         if (i >= sn_hwperf_obj_cnt) {
 342                                 /* no connection */
 343                                 seq_puts(s, " local endpoint disconnected"
 344                                             ", protocol unknown\n");
 345                                 continue;
 346                         }
 347
 348                         if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
 349                                 /* both ends local to this partition */
 350                                 seq_puts(s, " local");
 351                         else if (!obj->sn_hwp_this_part && !p->sn_hwp_this_part)
 352                                 /* both ends of the link in foreign partiton */
 353                                 seq_puts(s, " foreign");
 354                         else
 355                                 /* link straddles a partition */
 356                                 seq_puts(s, " shared");
 357
 358                         /*
 359                          * Unlikely, but strictly should query the LLP config
 360                          * registers because an NL4R can be configured to run
 361                          * NL3 protocol, even when not talking to an NL3 router.
 362                          * Ditto for node-node.
 363                          */
 364                         seq_printf(s, " endpoint %s-%d, protocol %s\n",
 365                                 p->location, ptdata[pt].conn_port,
 366                                 (SN_HWPERF_IS_NL3ROUTER(obj) ||
 367                                 SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
 368                 }
 369                 vfree(ptdata);
 370         }
 371
 372         return 0;
 373 }
 374
 375 static void *sn_topology_start(struct seq_file *s, loff_t * pos)
 376 {
 377         struct sn_hwperf_object_info *objs = s->private;
 378
 379         if (*pos < sn_hwperf_obj_cnt)
 380                 return (void *)(objs + *pos);
 381
 382         return NULL;
 383 }
 384
 385 static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
 386 {
 387         ++*pos;
 388         return sn_topology_start(s, pos);
 389 }
 390
 391 static void sn_topology_stop(struct seq_file *m, void *v)
 392 {
 393         return;
 394 }
 395
 396 /*
 397  * /proc/sgi_sn/sn_topology, read-only using seq_file
 398  */
 399 static struct seq_operations sn_topology_seq_ops = {
 400         .start = sn_topology_start,
 401         .next = sn_topology_next,
 402         .stop = sn_topology_stop,
 403         .show = sn_topology_show
 404 };
 405
 406 struct sn_hwperf_op_info {
 407         u64 op;
 408         struct sn_hwperf_ioctl_args *a;
 409         void *p;
 410         int *v0;
 411         int ret;
 412 };
 413
 414 static void sn_hwperf_call_sal(void *info)
 415 {
 416         struct sn_hwperf_op_info *op_info = info;
 417         int r;
 418
 419         r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
 420                       op_info->a->arg, op_info->a->sz,
 421                       (u64) op_info->p, 0, 0, op_info->v0);
 422         op_info->ret = r;
 423 }
 424
 425 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
 426 {
 427         u32 cpu;
 428         u32 use_ipi;
 429         int r = 0;
 430         cpumask_t save_allowed;
 431
 432         cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
 433         use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
 434         op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
 435
 436         if (cpu != SN_HWPERF_ARG_ANY_CPU) {
 437                 if (cpu >= num_online_cpus() || !cpu_online(cpu)) {
 438                         r = -EINVAL;
 439                         goto out;
 440                 }
 441         }
 442
 443         if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
 444                 /* don't care, or already on correct cpu */
 445                 sn_hwperf_call_sal(op_info);
 446         }
 447         else {
 448                 if (use_ipi) {
 449                         /* use an interprocessor interrupt to call SAL */
 450                         smp_call_function_single(cpu, sn_hwperf_call_sal,
 451                                 op_info, 1, 1);
 452                 }
 453                 else {
 454                         /* migrate the task before calling SAL */
 455                         save_allowed = current->cpus_allowed;
 456                         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 457                         sn_hwperf_call_sal(op_info);
 458                         set_cpus_allowed(current, save_allowed);
 459                 }
 460         }
 461         r = op_info->ret;
 462
 463 out:
 464         return r;
 465 }
 466
 467 /* map SAL hwperf error code to system error code */
 468 static int sn_hwperf_map_err(int hwperf_err)
 469 {
 470         int e;
 471
 472         switch(hwperf_err) {
 473         case SN_HWPERF_OP_OK:
 474                 e = 0;
 475                 break;
 476
 477         case SN_HWPERF_OP_NOMEM:
 478                 e = -ENOMEM;
 479                 break;
 480
 481         case SN_HWPERF_OP_NO_PERM:
 482                 e = -EPERM;
 483                 break;
 484
 485         case SN_HWPERF_OP_IO_ERROR:
 486                 e = -EIO;
 487                 break;
 488
 489         case SN_HWPERF_OP_BUSY:
 490                 e = -EBUSY;
 491                 break;
 492
 493         case SN_HWPERF_OP_RECONFIGURE:
 494                 e = -EAGAIN;
 495                 break;
 496
 497         case SN_HWPERF_OP_INVAL:
 498         default:
 499                 e = -EINVAL;
 500                 break;
 501         }
 502
 503         return e;
 504 }
 505
 506 /*
 507  * ioctl for "sn_hwperf" misc device
 508  */
 509 static int
 510 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 511 {
 512         struct sn_hwperf_ioctl_args a;
 513         struct cpuinfo_ia64 *cdata;
 514         struct sn_hwperf_object_info *objs;
 515         struct sn_hwperf_object_info *cpuobj;
 516         struct sn_hwperf_op_info op_info;
 517         void *p = NULL;
 518         int nobj;
 519         char slice;
 520         int node;
 521         int r;
 522         int v0;
 523         int i;
 524         int j;
 525
 526         unlock_kernel();
 527
 528         /* only user requests are allowed here */
 529         if ((op & SN_HWPERF_OP_MASK) < 10) {
 530                 r = -EINVAL;
 531                 goto error;
 532         }
 533         r = copy_from_user(&a, (const void __user *)arg,
 534                 sizeof(struct sn_hwperf_ioctl_args));
 535         if (r != 0) {
 536                 r = -EFAULT;
 537                 goto error;
 538         }
 539
 540         /*
 541          * Allocate memory to hold a kernel copy of the user buffer. The
 542          * buffer contents are either copied in or out (or both) of user
 543          * space depending on the flags encoded in the requested operation.
 544          */
 545         if (a.ptr) {
 546                 p = vmalloc(a.sz);
 547                 if (!p) {
 548                         r = -ENOMEM;
 549                         goto error;
 550                 }
 551         }
 552
 553         if (op & SN_HWPERF_OP_MEM_COPYIN) {
 554                 r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
 555                 if (r != 0) {
 556                         r = -EFAULT;
 557                         goto error;
 558                 }
 559         }
 560
 561         switch (op) {
 562         case SN_HWPERF_GET_CPU_INFO:
 563                 if (a.sz == sizeof(u64)) {
 564                         /* special case to get size needed */
 565                         *(u64 *) p = (u64) num_online_cpus() *
 566                                 sizeof(struct sn_hwperf_object_info);
 567                 } else
 568                 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
 569                         r = -ENOMEM;
 570                         goto error;
 571                 } else
 572                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 573                         memset(p, 0, a.sz);
 574                         for (i = 0; i < nobj; i++) {
 575                                 node = sn_hwperf_obj_to_cnode(objs + i);
 576                                 for_each_online_cpu(j) {
 577                                         if (node != cpu_to_node(j))
 578                                                 continue;
 579                                         cpuobj = (struct sn_hwperf_object_info *) p + j;
 580                                         slice = 'a' + cpuid_to_slice(j);
 581                                         cdata = cpu_data(j);
 582                                         cpuobj->id = j;
 583                                         snprintf(cpuobj->name,
 584                                                  sizeof(cpuobj->name),
 585                                                  "CPU %luMHz %s",
 586                                                  cdata->proc_freq / 1000000,
 587                                                  cdata->vendor);
 588                                         snprintf(cpuobj->location,
 589                                                  sizeof(cpuobj->location),
 590                                                  "%s%c", objs[i].location,
 591                                                  slice);
 592                                 }
 593                         }
 594
 595                         vfree(objs);
 596                 }
 597                 break;
 598
 599         case SN_HWPERF_GET_NODE_NASID:
 600                 if (a.sz != sizeof(u64) ||
 601                    (node = a.arg) < 0 || node >= numionodes) {
 602                         r = -EINVAL;
 603                         goto error;
 604                 }
 605                 *(u64 *)p = (u64)cnodeid_to_nasid(node);
 606                 break;
 607
 608         case SN_HWPERF_GET_OBJ_NODE:
 609                 if (a.sz != sizeof(u64) || a.arg < 0) {
 610                         r = -EINVAL;
 611                         goto error;
 612                 }
 613                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 614                         if (a.arg >= nobj) {
 615                                 r = -EINVAL;
 616                                 vfree(objs);
 617                                 goto error;
 618                         }
 619                         if (objs[(i = a.arg)].id != a.arg) {
 620                                 for (i = 0; i < nobj; i++) {
 621                                         if (objs[i].id == a.arg)
 622                                                 break;
 623                                 }
 624                         }
 625                         if (i == nobj) {
 626                                 r = -EINVAL;
 627                                 vfree(objs);
 628                                 goto error;
 629                         }
 630                         *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
 631                         vfree(objs);
 632                 }
 633                 break;
 634
 635         case SN_HWPERF_GET_MMRS:
 636         case SN_HWPERF_SET_MMRS:
 637         case SN_HWPERF_OBJECT_DISTANCE:
 638                 op_info.p = p;
 639                 op_info.a = &a;
 640                 op_info.v0 = &v0;
 641                 op_info.op = op;
 642                 r = sn_hwperf_op_cpu(&op_info);
 643                 if (r) {
 644                         r = sn_hwperf_map_err(r);
 645                         a.v0 = v0;
 646                         goto error;
 647                 }
 648                 break;
 649
 650         default:
 651                 /* all other ops are a direct SAL call */
 652                 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
 653                               a.arg, a.sz, (u64) p, 0, 0, &v0);
 654                 if (r) {
 655                         r = sn_hwperf_map_err(r);
 656                         goto error;
 657                 }
 658                 a.v0 = v0;
 659                 break;
 660         }
 661
 662         if (op & SN_HWPERF_OP_MEM_COPYOUT) {
 663                 r = copy_to_user((void __user *)a.ptr, p, a.sz);
 664                 if (r != 0) {
 665                         r = -EFAULT;
 666                         goto error;
 667                 }
 668         }
 669
 670 error:
 671         vfree(p);
 672
 673         lock_kernel();
 674         return r;
 675 }
 676
 677 static struct file_operations sn_hwperf_fops = {
 678         .ioctl = sn_hwperf_ioctl,
 679 };
 680
 681 static struct miscdevice sn_hwperf_dev = {
 682         MISC_DYNAMIC_MINOR,
 683         "sn_hwperf",
 684         &sn_hwperf_fops
 685 };
 686
 687 static int sn_hwperf_init(void)
 688 {
 689         u64 v;
 690         int salr;
 691         int e = 0;
 692
 693         /* single threaded, once-only initialization */
 694         down(&sn_hwperf_init_mutex);
 695         if (sn_hwperf_salheap) {
 696                 up(&sn_hwperf_init_mutex);
 697                 return e;
 698         }
 699
 700         /*
 701          * The PROM code needs a fixed reference node. For convenience the
 702          * same node as the console I/O is used.
 703          */
 704         sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
 705
 706         /*
 707          * Request the needed size and install the PROM scratch area.
 708          * The PROM keeps various tracking bits in this memory area.
 709          */
 710         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 711                                  (u64) SN_HWPERF_GET_HEAPSIZE, 0,
 712                                  (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
 713         if (salr != SN_HWPERF_OP_OK) {
 714                 e = -EINVAL;
 715                 goto out;
 716         }
 717
 718         if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
 719                 e = -ENOMEM;
 720                 goto out;
 721         }
 722         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 723                                  SN_HWPERF_INSTALL_HEAP, 0, v,
 724                                  (u64) sn_hwperf_salheap, 0, 0, NULL);
 725         if (salr != SN_HWPERF_OP_OK) {
 726                 e = -EINVAL;
 727                 goto out;
 728         }
 729
 730         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 731                                  SN_HWPERF_OBJECT_COUNT, 0,
 732                                  sizeof(u64), (u64) &v, 0, 0, NULL);
 733         if (salr != SN_HWPERF_OP_OK) {
 734                 e = -EINVAL;
 735                 goto out;
 736         }
 737         sn_hwperf_obj_cnt = (int)v;
 738
 739 out:
 740         if (e < 0 && sn_hwperf_salheap) {
 741                 vfree(sn_hwperf_salheap);
 742                 sn_hwperf_salheap = NULL;
 743                 sn_hwperf_obj_cnt = 0;
 744         }
 745
 746         if (!e) {
 747                 /*
 748                  * Register a dynamic misc device for ioctl. Platforms
 749                  * supporting hotplug will create /dev/sn_hwperf, else
 750                  * user can to look up the minor number in /proc/misc.
 751                  */
 752                 if ((e = misc_register(&sn_hwperf_dev)) != 0) {
 753                         printk(KERN_ERR "sn_hwperf_init: misc register "
 754                                "for \"sn_hwperf\" failed, err %d\n", e);
 755                 }
 756         }
 757
 758         up(&sn_hwperf_init_mutex);
 759         return e;
 760 }
 761
 762 int sn_topology_open(struct inode *inode, struct file *file)
 763 {
 764         int e;
 765         struct seq_file *seq;
 766         struct sn_hwperf_object_info *objbuf;
 767         int nobj;
 768
 769         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 770                 e = seq_open(file, &sn_topology_seq_ops);
 771                 seq = file->private_data;
 772                 seq->private = objbuf;
 773         }
 774
 775         return e;
 776 }
 777
 778 int sn_topology_release(struct inode *inode, struct file *file)
 779 {
 780         struct seq_file *seq = file->private_data;
 781
 782         vfree(seq->private);
 783         return seq_release(inode, file);
 784 }