err.no Git - linux-2.6/blob - arch/ia64/sn/kernel/sn2/sn_hwperf.c

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