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 = 0; /* XXX */
 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         char *pci_topo_buf, int len)
 180 {
 181         char *p1;
 182         char *p2;
 183
 184         for (p1=pci_topo_buf; *p1 && p1 < pci_topo_buf + len;) {
 185                 if (!(p2 = strchr(p1, '\n')))
 186                         break;
 187                 *p2 = '\0';
 188                 seq_printf(s, "pcibus %d %s-%s\n",
 189                         *ordinal, obj->location, p1);
 190                 (*ordinal)++;
 191                 p1 = p2 + 1;
 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         int rack, bay, slot, slab;
 212         u8 shubtype;
 213         u8 system_size;
 214         u8 sharing_size;
 215         u8 partid;
 216         u8 coher;
 217         u8 nasid_shift;
 218         u8 region_size;
 219         u16 nasid_mask;
 220         int nasid_msb;
 221         char *pci_topo_buf;
 222         int pci_bus_ordinal = 0;
 223         static int pci_topo_buf_len = 256;
 224
 225         if (obj == objs) {
 226                 seq_printf(s, "# sn_topology version 2\n");
 227                 seq_printf(s, "# objtype ordinal location partition"
 228                         " [attribute value [, ...]]\n");
 229
 230                 if (ia64_sn_get_sn_info(0,
 231                         &shubtype, &nasid_mask, &nasid_shift, &system_size,
 232                         &sharing_size, &partid, &coher, &region_size))
 233                         BUG();
 234                 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
 235                         if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
 236                                 break;
 237                 }
 238                 seq_printf(s, "partition %u %s local "
 239                         "shubtype %s, "
 240                         "nasid_mask 0x%016lx, "
 241                         "nasid_bits %d:%d, "
 242                         "system_size %d, "
 243                         "sharing_size %d, "
 244                         "coherency_domain %d, "
 245                         "region_size %d\n",
 246
 247                         partid, system_utsname.nodename,
 248                         shubtype ? "shub2" : "shub1",
 249                         (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
 250                         system_size, sharing_size, coher, region_size);
 251         }
 252
 253         if (SN_HWPERF_FOREIGN(obj)) {
 254                 /* private in another partition: not interesting */
 255                 return 0;
 256         }
 257
 258         for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
 259                 if (obj->name[i] == ' ')
 260                         obj->name[i] = '_';
 261         }
 262
 263         slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
 264         seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
 265                 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
 266
 267         if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
 268                 seq_putc(s, '\n');
 269         else {
 270                 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
 271                 for (i=0; i < numionodes; i++) {
 272                         seq_printf(s, i ? ":%d" : ", dist %d",
 273                                 node_distance(ordinal, i));
 274                 }
 275                 seq_putc(s, '\n');
 276
 277                 /*
 278                  * CPUs on this node, if any
 279                  */
 280                 cpumask = node_to_cpumask(ordinal);
 281                 for_each_online_cpu(i) {
 282                         if (cpu_isset(i, cpumask)) {
 283                                 slice = 'a' + cpuid_to_slice(i);
 284                                 c = cpu_data(i);
 285                                 seq_printf(s, "cpu %d %s%c local"
 286                                         " freq %luMHz, arch ia64",
 287                                         i, obj->location, slice,
 288                                         c->proc_freq / 1000000);
 289                                 for_each_online_cpu(j) {
 290                                         seq_printf(s, j ? ":%d" : ", dist %d",
 291                                                 node_distance(
 292                                                     cpuid_to_cnodeid(i),
 293                                                     cpuid_to_cnodeid(j)));
 294                                 }
 295                                 seq_putc(s, '\n');
 296                         }
 297                 }
 298
 299                 /*
 300                  * PCI busses attached to this node, if any
 301                  */
 302                 do {
 303                         if (sn_hwperf_location_to_bpos(obj->location,
 304                                 &rack, &bay, &slot, &slab)) {
 305                                 break;
 306                         }
 307
 308                         if (!(pci_topo_buf = vmalloc(pci_topo_buf_len))) {
 309                                 printk("sn_topology_show: vmalloc failed\n");
 310                                 break;
 311                         }
 312
 313                         e = ia64_sn_ioif_get_pci_topology(rack, bay, slot, slab,
 314                                 pci_topo_buf, pci_topo_buf_len);
 315
 316                         switch (e) {
 317                         case SALRET_NOT_IMPLEMENTED:
 318                         case SALRET_INVALID_ARG:
 319                                 /* ignore, don't print anything */
 320                                 e = SN_HWPERF_OP_OK;
 321                                 break;
 322
 323                         case SALRET_ERROR:
 324                                 /* retry with a bigger buffer */
 325                                 pci_topo_buf_len += 256;
 326                                 break;
 327
 328                         case SN_HWPERF_OP_OK:
 329                         default:
 330                                 /* export pci bus info */
 331                                 print_pci_topology(s, obj, &pci_bus_ordinal,
 332                                         pci_topo_buf, pci_topo_buf_len);
 333                                 break;
 334                         }
 335                         vfree(pci_topo_buf);
 336                 } while (e != SN_HWPERF_OP_OK && pci_topo_buf_len < 0x200000);
 337         }
 338
 339         if (obj->ports) {
 340                 /*
 341                  * numalink ports
 342                  */
 343                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
 344                 if ((ptdata = vmalloc(sz)) == NULL)
 345                         return -ENOMEM;
 346                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 347                                       SN_HWPERF_ENUM_PORTS, obj->id, sz,
 348                                       (u64) ptdata, 0, 0, NULL);
 349                 if (e != SN_HWPERF_OP_OK)
 350                         return -EINVAL;
 351                 for (ordinal=0, p=objs; p != obj; p++) {
 352                         if (!SN_HWPERF_FOREIGN(p))
 353                                 ordinal += p->ports;
 354                 }
 355                 for (pt = 0; pt < obj->ports; pt++) {
 356                         for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
 357                                 if (ptdata[pt].conn_id == p->id) {
 358                                         break;
 359                                 }
 360                         }
 361                         seq_printf(s, "numalink %d %s-%d",
 362                             ordinal+pt, obj->location, ptdata[pt].port);
 363
 364                         if (i >= sn_hwperf_obj_cnt) {
 365                                 /* no connection */
 366                                 seq_puts(s, " local endpoint disconnected"
 367                                             ", protocol unknown\n");
 368                                 continue;
 369                         }
 370
 371                         if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
 372                                 /* both ends local to this partition */
 373                                 seq_puts(s, " local");
 374                         else if (!obj->sn_hwp_this_part && !p->sn_hwp_this_part)
 375                                 /* both ends of the link in foreign partiton */
 376                                 seq_puts(s, " foreign");
 377                         else
 378                                 /* link straddles a partition */
 379                                 seq_puts(s, " shared");
 380
 381                         /*
 382                          * Unlikely, but strictly should query the LLP config
 383                          * registers because an NL4R can be configured to run
 384                          * NL3 protocol, even when not talking to an NL3 router.
 385                          * Ditto for node-node.
 386                          */
 387                         seq_printf(s, " endpoint %s-%d, protocol %s\n",
 388                                 p->location, ptdata[pt].conn_port,
 389                                 (SN_HWPERF_IS_NL3ROUTER(obj) ||
 390                                 SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
 391                 }
 392                 vfree(ptdata);
 393         }
 394
 395         return 0;
 396 }
 397
 398 static void *sn_topology_start(struct seq_file *s, loff_t * pos)
 399 {
 400         struct sn_hwperf_object_info *objs = s->private;
 401
 402         if (*pos < sn_hwperf_obj_cnt)
 403                 return (void *)(objs + *pos);
 404
 405         return NULL;
 406 }
 407
 408 static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
 409 {
 410         ++*pos;
 411         return sn_topology_start(s, pos);
 412 }
 413
 414 static void sn_topology_stop(struct seq_file *m, void *v)
 415 {
 416         return;
 417 }
 418
 419 /*
 420  * /proc/sgi_sn/sn_topology, read-only using seq_file
 421  */
 422 static struct seq_operations sn_topology_seq_ops = {
 423         .start = sn_topology_start,
 424         .next = sn_topology_next,
 425         .stop = sn_topology_stop,
 426         .show = sn_topology_show
 427 };
 428
 429 struct sn_hwperf_op_info {
 430         u64 op;
 431         struct sn_hwperf_ioctl_args *a;
 432         void *p;
 433         int *v0;
 434         int ret;
 435 };
 436
 437 static void sn_hwperf_call_sal(void *info)
 438 {
 439         struct sn_hwperf_op_info *op_info = info;
 440         int r;
 441
 442         r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
 443                       op_info->a->arg, op_info->a->sz,
 444                       (u64) op_info->p, 0, 0, op_info->v0);
 445         op_info->ret = r;
 446 }
 447
 448 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
 449 {
 450         u32 cpu;
 451         u32 use_ipi;
 452         int r = 0;
 453         cpumask_t save_allowed;
 454
 455         cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
 456         use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
 457         op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
 458
 459         if (cpu != SN_HWPERF_ARG_ANY_CPU) {
 460                 if (cpu >= num_online_cpus() || !cpu_online(cpu)) {
 461                         r = -EINVAL;
 462                         goto out;
 463                 }
 464         }
 465
 466         if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
 467                 /* don't care, or already on correct cpu */
 468                 sn_hwperf_call_sal(op_info);
 469         }
 470         else {
 471                 if (use_ipi) {
 472                         /* use an interprocessor interrupt to call SAL */
 473                         smp_call_function_single(cpu, sn_hwperf_call_sal,
 474                                 op_info, 1, 1);
 475                 }
 476                 else {
 477                         /* migrate the task before calling SAL */
 478                         save_allowed = current->cpus_allowed;
 479                         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 480                         sn_hwperf_call_sal(op_info);
 481                         set_cpus_allowed(current, save_allowed);
 482                 }
 483         }
 484         r = op_info->ret;
 485
 486 out:
 487         return r;
 488 }
 489
 490 /* map SAL hwperf error code to system error code */
 491 static int sn_hwperf_map_err(int hwperf_err)
 492 {
 493         int e;
 494
 495         switch(hwperf_err) {
 496         case SN_HWPERF_OP_OK:
 497                 e = 0;
 498                 break;
 499
 500         case SN_HWPERF_OP_NOMEM:
 501                 e = -ENOMEM;
 502                 break;
 503
 504         case SN_HWPERF_OP_NO_PERM:
 505                 e = -EPERM;
 506                 break;
 507
 508         case SN_HWPERF_OP_IO_ERROR:
 509                 e = -EIO;
 510                 break;
 511
 512         case SN_HWPERF_OP_BUSY:
 513                 e = -EBUSY;
 514                 break;
 515
 516         case SN_HWPERF_OP_RECONFIGURE:
 517                 e = -EAGAIN;
 518                 break;
 519
 520         case SN_HWPERF_OP_INVAL:
 521         default:
 522                 e = -EINVAL;
 523                 break;
 524         }
 525
 526         return e;
 527 }
 528
 529 /*
 530  * ioctl for "sn_hwperf" misc device
 531  */
 532 static int
 533 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 534 {
 535         struct sn_hwperf_ioctl_args a;
 536         struct cpuinfo_ia64 *cdata;
 537         struct sn_hwperf_object_info *objs;
 538         struct sn_hwperf_object_info *cpuobj;
 539         struct sn_hwperf_op_info op_info;
 540         void *p = NULL;
 541         int nobj;
 542         char slice;
 543         int node;
 544         int r;
 545         int v0;
 546         int i;
 547         int j;
 548
 549         unlock_kernel();
 550
 551         /* only user requests are allowed here */
 552         if ((op & SN_HWPERF_OP_MASK) < 10) {
 553                 r = -EINVAL;
 554                 goto error;
 555         }
 556         r = copy_from_user(&a, (const void __user *)arg,
 557                 sizeof(struct sn_hwperf_ioctl_args));
 558         if (r != 0) {
 559                 r = -EFAULT;
 560                 goto error;
 561         }
 562
 563         /*
 564          * Allocate memory to hold a kernel copy of the user buffer. The
 565          * buffer contents are either copied in or out (or both) of user
 566          * space depending on the flags encoded in the requested operation.
 567          */
 568         if (a.ptr) {
 569                 p = vmalloc(a.sz);
 570                 if (!p) {
 571                         r = -ENOMEM;
 572                         goto error;
 573                 }
 574         }
 575
 576         if (op & SN_HWPERF_OP_MEM_COPYIN) {
 577                 r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
 578                 if (r != 0) {
 579                         r = -EFAULT;
 580                         goto error;
 581                 }
 582         }
 583
 584         switch (op) {
 585         case SN_HWPERF_GET_CPU_INFO:
 586                 if (a.sz == sizeof(u64)) {
 587                         /* special case to get size needed */
 588                         *(u64 *) p = (u64) num_online_cpus() *
 589                                 sizeof(struct sn_hwperf_object_info);
 590                 } else
 591                 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
 592                         r = -ENOMEM;
 593                         goto error;
 594                 } else
 595                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 596                         memset(p, 0, a.sz);
 597                         for (i = 0; i < nobj; i++) {
 598                                 node = sn_hwperf_obj_to_cnode(objs + i);
 599                                 for_each_online_cpu(j) {
 600                                         if (node != cpu_to_node(j))
 601                                                 continue;
 602                                         cpuobj = (struct sn_hwperf_object_info *) p + j;
 603                                         slice = 'a' + cpuid_to_slice(j);
 604                                         cdata = cpu_data(j);
 605                                         cpuobj->id = j;
 606                                         snprintf(cpuobj->name,
 607                                                  sizeof(cpuobj->name),
 608                                                  "CPU %luMHz %s",
 609                                                  cdata->proc_freq / 1000000,
 610                                                  cdata->vendor);
 611                                         snprintf(cpuobj->location,
 612                                                  sizeof(cpuobj->location),
 613                                                  "%s%c", objs[i].location,
 614                                                  slice);
 615                                 }
 616                         }
 617
 618                         vfree(objs);
 619                 }
 620                 break;
 621
 622         case SN_HWPERF_GET_NODE_NASID:
 623                 if (a.sz != sizeof(u64) ||
 624                    (node = a.arg) < 0 || node >= numionodes) {
 625                         r = -EINVAL;
 626                         goto error;
 627                 }
 628                 *(u64 *)p = (u64)cnodeid_to_nasid(node);
 629                 break;
 630
 631         case SN_HWPERF_GET_OBJ_NODE:
 632                 if (a.sz != sizeof(u64) || a.arg < 0) {
 633                         r = -EINVAL;
 634                         goto error;
 635                 }
 636                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 637                         if (a.arg >= nobj) {
 638                                 r = -EINVAL;
 639                                 vfree(objs);
 640                                 goto error;
 641                         }
 642                         if (objs[(i = a.arg)].id != a.arg) {
 643                                 for (i = 0; i < nobj; i++) {
 644                                         if (objs[i].id == a.arg)
 645                                                 break;
 646                                 }
 647                         }
 648                         if (i == nobj) {
 649                                 r = -EINVAL;
 650                                 vfree(objs);
 651                                 goto error;
 652                         }
 653                         *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
 654                         vfree(objs);
 655                 }
 656                 break;
 657
 658         case SN_HWPERF_GET_MMRS:
 659         case SN_HWPERF_SET_MMRS:
 660         case SN_HWPERF_OBJECT_DISTANCE:
 661                 op_info.p = p;
 662                 op_info.a = &a;
 663                 op_info.v0 = &v0;
 664                 op_info.op = op;
 665                 r = sn_hwperf_op_cpu(&op_info);
 666                 if (r) {
 667                         r = sn_hwperf_map_err(r);
 668                         a.v0 = v0;
 669                         goto error;
 670                 }
 671                 break;
 672
 673         default:
 674                 /* all other ops are a direct SAL call */
 675                 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
 676                               a.arg, a.sz, (u64) p, 0, 0, &v0);
 677                 if (r) {
 678                         r = sn_hwperf_map_err(r);
 679                         goto error;
 680                 }
 681                 a.v0 = v0;
 682                 break;
 683         }
 684
 685         if (op & SN_HWPERF_OP_MEM_COPYOUT) {
 686                 r = copy_to_user((void __user *)a.ptr, p, a.sz);
 687                 if (r != 0) {
 688                         r = -EFAULT;
 689                         goto error;
 690                 }
 691         }
 692
 693 error:
 694         vfree(p);
 695
 696         lock_kernel();
 697         return r;
 698 }
 699
 700 static struct file_operations sn_hwperf_fops = {
 701         .ioctl = sn_hwperf_ioctl,
 702 };
 703
 704 static struct miscdevice sn_hwperf_dev = {
 705         MISC_DYNAMIC_MINOR,
 706         "sn_hwperf",
 707         &sn_hwperf_fops
 708 };
 709
 710 static int sn_hwperf_init(void)
 711 {
 712         u64 v;
 713         int salr;
 714         int e = 0;
 715
 716         /* single threaded, once-only initialization */
 717         down(&sn_hwperf_init_mutex);
 718         if (sn_hwperf_salheap) {
 719                 up(&sn_hwperf_init_mutex);
 720                 return e;
 721         }
 722
 723         /*
 724          * The PROM code needs a fixed reference node. For convenience the
 725          * same node as the console I/O is used.
 726          */
 727         sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
 728
 729         /*
 730          * Request the needed size and install the PROM scratch area.
 731          * The PROM keeps various tracking bits in this memory area.
 732          */
 733         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 734                                  (u64) SN_HWPERF_GET_HEAPSIZE, 0,
 735                                  (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
 736         if (salr != SN_HWPERF_OP_OK) {
 737                 e = -EINVAL;
 738                 goto out;
 739         }
 740
 741         if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
 742                 e = -ENOMEM;
 743                 goto out;
 744         }
 745         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 746                                  SN_HWPERF_INSTALL_HEAP, 0, v,
 747                                  (u64) sn_hwperf_salheap, 0, 0, NULL);
 748         if (salr != SN_HWPERF_OP_OK) {
 749                 e = -EINVAL;
 750                 goto out;
 751         }
 752
 753         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 754                                  SN_HWPERF_OBJECT_COUNT, 0,
 755                                  sizeof(u64), (u64) &v, 0, 0, NULL);
 756         if (salr != SN_HWPERF_OP_OK) {
 757                 e = -EINVAL;
 758                 goto out;
 759         }
 760         sn_hwperf_obj_cnt = (int)v;
 761
 762 out:
 763         if (e < 0 && sn_hwperf_salheap) {
 764                 vfree(sn_hwperf_salheap);
 765                 sn_hwperf_salheap = NULL;
 766                 sn_hwperf_obj_cnt = 0;
 767         }
 768
 769         if (!e) {
 770                 /*
 771                  * Register a dynamic misc device for ioctl. Platforms
 772                  * supporting hotplug will create /dev/sn_hwperf, else
 773                  * user can to look up the minor number in /proc/misc.
 774                  */
 775                 if ((e = misc_register(&sn_hwperf_dev)) != 0) {
 776                         printk(KERN_ERR "sn_hwperf_init: misc register "
 777                                "for \"sn_hwperf\" failed, err %d\n", e);
 778                 }
 779         }
 780
 781         up(&sn_hwperf_init_mutex);
 782         return e;
 783 }
 784
 785 int sn_topology_open(struct inode *inode, struct file *file)
 786 {
 787         int e;
 788         struct seq_file *seq;
 789         struct sn_hwperf_object_info *objbuf;
 790         int nobj;
 791
 792         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 793                 e = seq_open(file, &sn_topology_seq_ops);
 794                 seq = file->private_data;
 795                 seq->private = objbuf;
 796         }
 797
 798         return e;
 799 }
 800
 801 int sn_topology_release(struct inode *inode, struct file *file)
 802 {
 803         struct seq_file *seq = file->private_data;
 804
 805         vfree(seq->private);
 806         return seq_release(inode, file);
 807 }