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 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/cpumask.h>
  32 #include <linux/smp_lock.h>
  33 #include <asm/processor.h>
  34 #include <asm/topology.h>
  35 #include <asm/smp.h>
  36 #include <asm/semaphore.h>
  37 #include <asm/segment.h>
  38 #include <asm/uaccess.h>
  39 #include <asm-ia64/sal.h>
  40 #include <asm-ia64/sn/sn_sal.h>
  41 #include <asm-ia64/sn/sn2/sn_hwperf.h>
  42
  43 static void *sn_hwperf_salheap = NULL;
  44 static int sn_hwperf_obj_cnt = 0;
  45 static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
  46 static int sn_hwperf_init(void);
  47 static DECLARE_MUTEX(sn_hwperf_init_mutex);
  48
  49 static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
  50 {
  51         int e;
  52         u64 sz;
  53         struct sn_hwperf_object_info *objbuf = NULL;
  54
  55         if ((e = sn_hwperf_init()) < 0) {
  56                 printk("sn_hwperf_init failed: err %d\n", e);
  57                 goto out;
  58         }
  59
  60         sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
  61         if ((objbuf = (struct sn_hwperf_object_info *) vmalloc(sz)) == NULL) {
  62                 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
  63                 e = -ENOMEM;
  64                 goto out;
  65         }
  66
  67         e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
  68                 0, sz, (u64) objbuf, 0, 0, NULL);
  69         if (e != SN_HWPERF_OP_OK) {
  70                 e = -EINVAL;
  71                 vfree(objbuf);
  72         }
  73
  74 out:
  75         *nobj = sn_hwperf_obj_cnt;
  76         *ret = objbuf;
  77         return e;
  78 }
  79
  80 static int sn_hwperf_geoid_to_cnode(char *location)
  81 {
  82         int cnode;
  83         int mod, slot, slab;
  84         int cmod, cslot, cslab;
  85
  86         if (sscanf(location, "%03dc%02d#%d", &mod, &slot, &slab) != 3)
  87                 return -1;
  88         for (cnode = 0; cnode < numnodes; cnode++) {
  89                 /* XXX: need a better way than this ... */
  90                 if (sscanf(NODEPDA(cnode)->hwg_node_name,
  91                    "hw/module/%03dc%02d/slab/%d", &cmod, &cslot, &cslab) == 3) {
  92                         if (mod == cmod && slot == cslot && slab == cslab)
  93                                 break;
  94                 }
  95         }
  96
  97         return cnode < numnodes ? cnode : -1;
  98 }
  99
 100 static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
 101 {
 102         if (!obj->sn_hwp_this_part)
 103                 return -1;
 104         return sn_hwperf_geoid_to_cnode(obj->location);
 105 }
 106
 107 static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
 108                                 struct sn_hwperf_object_info *objs)
 109 {
 110         int ordinal;
 111         struct sn_hwperf_object_info *p;
 112
 113         for (ordinal=0, p=objs; p != obj; p++) {
 114                 if (SN_HWPERF_FOREIGN(p))
 115                         continue;
 116                 if (p->location[3] == obj->location[3])
 117                         ordinal++;
 118         }
 119
 120         return ordinal;
 121 }
 122
 123 #ifndef MODULE_IOBRICK
 124 /* this will be available when ioif TIO support is added */
 125 #define MODULE_IOBRICK (MODULE_OPUSBRICK+1)
 126 #endif
 127
 128 static const char *sn_hwperf_get_brickname(struct sn_hwperf_object_info *obj,
 129                                 struct sn_hwperf_object_info *objs, int *ordinal)
 130 {
 131         int i;
 132         const char *objtype = NULL;
 133
 134         for (i=0; i < MAX_BRICK_TYPES; i++) {
 135                 if (brick_types[i] != obj->location[3])
 136                         continue;
 137                 switch (i) {
 138                 case MODULE_CBRICK:
 139                     objtype = "node";
 140                     *ordinal = sn_hwperf_obj_to_cnode(obj); /* cnodeid */
 141                     break;
 142
 143                 case MODULE_RBRICK:
 144                     objtype = "router";
 145                     *ordinal = sn_hwperf_generic_ordinal(obj, objs);
 146                     break;
 147
 148                 case MODULE_IOBRICK:
 149                     objtype = "ionode";
 150                     *ordinal = sn_hwperf_generic_ordinal(obj, objs);
 151                     break;
 152                 }
 153                 break;
 154         }
 155
 156         if (i == MAX_BRICK_TYPES) {
 157                 objtype = "other";
 158                 *ordinal = sn_hwperf_generic_ordinal(obj, objs);
 159         }
 160
 161         return objtype;
 162 }
 163
 164 static int sn_topology_show(struct seq_file *s, void *d)
 165 {
 166         int sz;
 167         int pt;
 168         int e;
 169         int i;
 170         int j;
 171         const char *brickname;
 172         int ordinal;
 173         cpumask_t cpumask;
 174         char slice;
 175         struct cpuinfo_ia64 *c;
 176         struct sn_hwperf_port_info *ptdata;
 177         struct sn_hwperf_object_info *p;
 178         struct sn_hwperf_object_info *obj = d;  /* this object */
 179         struct sn_hwperf_object_info *objs = s->private; /* all objects */
 180
 181         if (obj == objs) {
 182                 seq_printf(s, "# sn_topology version 1\n");
 183                 seq_printf(s, "# objtype ordinal location partition"
 184                         " [attribute value [, ...]]\n");
 185         }
 186
 187         if (SN_HWPERF_FOREIGN(obj)) {
 188                 /* private in another partition: not interesting */
 189                 return 0;
 190         }
 191
 192         for (i = 0; obj->name[i]; i++) {
 193                 if (obj->name[i] == ' ')
 194                         obj->name[i] = '_';
 195         }
 196
 197         brickname = sn_hwperf_get_brickname(obj, objs, &ordinal);
 198         seq_printf(s, "%s %d %s %s asic %s", brickname, ordinal, obj->location,
 199                 obj->sn_hwp_this_part ? "local" : "shared", obj->name);
 200
 201         if (obj->location[3] != 'c')
 202                 seq_putc(s, '\n');
 203         else {
 204                 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));
 205                 for (i=0; i < numnodes; i++) {
 206                         seq_printf(s, i ? ":%d" : ", dist %d",
 207                                 node_distance(ordinal, i));
 208                 }
 209                 seq_putc(s, '\n');
 210
 211                 /*
 212                  * CPUs on this node
 213                  */
 214                 cpumask = node_to_cpumask(ordinal);
 215                 for_each_online_cpu(i) {
 216                         if (cpu_isset(i, cpumask)) {
 217                                 slice = 'a' + cpuid_to_slice(i);
 218                                 c = cpu_data(i);
 219                                 seq_printf(s, "cpu %d %s%c local"
 220                                         " freq %luMHz, arch ia64",
 221                                         i, obj->location, slice,
 222                                         c->proc_freq / 1000000);
 223                                 for_each_online_cpu(j) {
 224                                         seq_printf(s, j ? ":%d" : ", dist %d",
 225                                                 node_distance(
 226                                                     cpuid_to_cnodeid(i),
 227                                                     cpuid_to_cnodeid(j)));
 228                                 }
 229                                 seq_putc(s, '\n');
 230                         }
 231                 }
 232         }
 233
 234         if (obj->ports) {
 235                 /*
 236                  * numalink ports
 237                  */
 238                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
 239                 if ((ptdata = vmalloc(sz)) == NULL)
 240                         return -ENOMEM;
 241                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 242                                       SN_HWPERF_ENUM_PORTS, obj->id, sz,
 243                                       (u64) ptdata, 0, 0, NULL);
 244                 if (e != SN_HWPERF_OP_OK)
 245                         return -EINVAL;
 246                 for (ordinal=0, p=objs; p != obj; p++) {
 247                         if (!SN_HWPERF_FOREIGN(p))
 248                                 ordinal += p->ports;
 249                 }
 250                 for (pt = 0; pt < obj->ports; pt++) {
 251                         for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
 252                                 if (ptdata[pt].conn_id == p->id) {
 253                                         break;
 254                                 }
 255                         }
 256                         if (i >= sn_hwperf_obj_cnt)
 257                                 continue;
 258                         seq_printf(s, "numalink %d %s-%d",
 259                             ordinal+pt, obj->location, ptdata[pt].port);
 260
 261                         if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
 262                                 /* both ends local to this partition */
 263                                 seq_puts(s, " local");
 264                         else if (!obj->sn_hwp_this_part && !p->sn_hwp_this_part)
 265                                 /* both ends of the link in foreign partiton */
 266                                 seq_puts(s, " foreign");
 267                         else
 268                                 /* link straddles a partition */
 269                                 seq_puts(s, " shared");
 270
 271                         /*
 272                          * Unlikely, but strictly should query the LLP config
 273                          * registers because an NL4R can be configured to run
 274                          * NL3 protocol, even when not talking to an NL3 router.
 275                          * Ditto for node-node.
 276                          */
 277                         seq_printf(s, " endpoint %s-%d, protocol %s\n",
 278                                 p->location, ptdata[pt].conn_port,
 279                                 strcmp(obj->name, "NL3Router") == 0 ||
 280                                 strcmp(p->name, "NL3Router") == 0 ?
 281                                 "LLP3" : "LLP4");
 282                 }
 283                 vfree(ptdata);
 284         }
 285
 286         return 0;
 287 }
 288
 289 static void *sn_topology_start(struct seq_file *s, loff_t * pos)
 290 {
 291         struct sn_hwperf_object_info *objs = s->private;
 292
 293         if (*pos < sn_hwperf_obj_cnt)
 294                 return (void *)(objs + *pos);
 295
 296         return NULL;
 297 }
 298
 299 static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
 300 {
 301         ++*pos;
 302         return sn_topology_start(s, pos);
 303 }
 304
 305 static void sn_topology_stop(struct seq_file *m, void *v)
 306 {
 307         return;
 308 }
 309
 310 /*
 311  * /proc/sgi_sn/sn_topology, read-only using seq_file
 312  */
 313 static struct seq_operations sn_topology_seq_ops = {
 314         .start = sn_topology_start,
 315         .next = sn_topology_next,
 316         .stop = sn_topology_stop,
 317         .show = sn_topology_show
 318 };
 319
 320 struct sn_hwperf_op_info {
 321         u64 op;
 322         struct sn_hwperf_ioctl_args *a;
 323         void *p;
 324         int *v0;
 325         int ret;
 326 };
 327
 328 static void sn_hwperf_call_sal(void *info)
 329 {
 330         struct sn_hwperf_op_info *op_info = info;
 331         int r;
 332
 333         r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
 334                       op_info->a->arg, op_info->a->sz,
 335                       (u64) op_info->p, 0, 0, op_info->v0);
 336         op_info->ret = r;
 337 }
 338
 339 static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
 340 {
 341         u32 cpu;
 342         u32 use_ipi;
 343         int r = 0;
 344         cpumask_t save_allowed;
 345
 346         cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
 347         use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
 348         op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;
 349
 350         if (cpu != SN_HWPERF_ARG_ANY_CPU) {
 351                 if (cpu >= num_online_cpus() || !cpu_online(cpu)) {
 352                         r = -EINVAL;
 353                         goto out;
 354                 }
 355         }
 356
 357         if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
 358                 /* don't care, or already on correct cpu */
 359                 sn_hwperf_call_sal(op_info);
 360         }
 361         else {
 362                 if (use_ipi) {
 363                         /* use an interprocessor interrupt to call SAL */
 364                         smp_call_function_single(cpu, sn_hwperf_call_sal,
 365                                 op_info, 1, 1);
 366                 }
 367                 else {
 368                         /* migrate the task before calling SAL */
 369                         save_allowed = current->cpus_allowed;
 370                         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 371                         sn_hwperf_call_sal(op_info);
 372                         set_cpus_allowed(current, save_allowed);
 373                 }
 374         }
 375         r = op_info->ret;
 376
 377 out:
 378         return r;
 379 }
 380
 381 /*
 382  * ioctl for "sn_hwperf" misc device
 383  */
 384 static int
 385 sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg)
 386 {
 387         struct sn_hwperf_ioctl_args a;
 388         struct cpuinfo_ia64 *cdata;
 389         struct sn_hwperf_object_info *objs;
 390         struct sn_hwperf_object_info *cpuobj;
 391         struct sn_hwperf_op_info op_info;
 392         void *p = NULL;
 393         int nobj;
 394         char slice;
 395         int node;
 396         int r;
 397         int v0;
 398         int i;
 399         int j;
 400
 401         unlock_kernel();
 402
 403         /* only user requests are allowed here */
 404         if ((op & SN_HWPERF_OP_MASK) < 10) {
 405                 r = -EINVAL;
 406                 goto error;
 407         }
 408         r = copy_from_user(&a, (const void *)arg,
 409                 sizeof(struct sn_hwperf_ioctl_args));
 410         if (r != 0) {
 411                 r = -EFAULT;
 412                 goto error;
 413         }
 414
 415         /*
 416          * Allocate memory to hold a kernel copy of the user buffer. The
 417          * buffer contents are either copied in or out (or both) of user
 418          * space depending on the flags encoded in the requested operation.
 419          */
 420         if (a.ptr) {
 421                 p = vmalloc(a.sz);
 422                 if (!p) {
 423                         r = -ENOMEM;
 424                         goto error;
 425                 }
 426         }
 427
 428         if (op & SN_HWPERF_OP_MEM_COPYIN) {
 429                 r = copy_from_user(p, (const void *)a.ptr, a.sz);
 430                 if (r != 0) {
 431                         r = -EFAULT;
 432                         goto error;
 433                 }
 434         }
 435
 436         switch (op) {
 437         case SN_HWPERF_GET_CPU_INFO:
 438                 if (a.sz == sizeof(u64)) {
 439                         /* special case to get size needed */
 440                         *(u64 *) p = (u64) num_online_cpus() *
 441                                 sizeof(struct sn_hwperf_object_info);
 442                 } else
 443                 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
 444                         r = -ENOMEM;
 445                         goto error;
 446                 } else
 447                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 448                         memset(p, 0, a.sz);
 449                         for (i = 0; i < nobj; i++) {
 450                                 node = sn_hwperf_obj_to_cnode(objs + i);
 451                                 for_each_online_cpu(j) {
 452                                         if (node != cpu_to_node(j))
 453                                                 continue;
 454                                         cpuobj = (struct sn_hwperf_object_info *) p + j;
 455                                         slice = 'a' + cpuid_to_slice(j);
 456                                         cdata = cpu_data(j);
 457                                         cpuobj->id = j;
 458                                         snprintf(cpuobj->name,
 459                                                  sizeof(cpuobj->name),
 460                                                  "CPU %luMHz %s",
 461                                                  cdata->proc_freq / 1000000,
 462                                                  cdata->vendor);
 463                                         snprintf(cpuobj->location,
 464                                                  sizeof(cpuobj->location),
 465                                                  "%s%c", objs[i].location,
 466                                                  slice);
 467                                 }
 468                         }
 469
 470                         vfree(objs);
 471                 }
 472                 break;
 473
 474         case SN_HWPERF_GET_NODE_NASID:
 475                 if (a.sz != sizeof(u64) ||
 476                    (node = a.arg) < 0 || node >= numnodes) {
 477                         r = -EINVAL;
 478                         goto error;
 479                 }
 480                 *(u64 *)p = (u64)cnodeid_to_nasid(node);
 481                 break;
 482
 483         case SN_HWPERF_GET_OBJ_NODE:
 484                 if (a.sz != sizeof(u64) || a.arg < 0) {
 485                         r = -EINVAL;
 486                         goto error;
 487                 }
 488                 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
 489                         if (a.arg >= nobj) {
 490                                 r = -EINVAL;
 491                                 vfree(objs);
 492                                 goto error;
 493                         }
 494                         if (objs[(i = a.arg)].id != a.arg) {
 495                                 for (i = 0; i < nobj; i++) {
 496                                         if (objs[i].id == a.arg)
 497                                                 break;
 498                                 }
 499                         }
 500                         if (i == nobj) {
 501                                 r = -EINVAL;
 502                                 vfree(objs);
 503                                 goto error;
 504                         }
 505                         *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
 506                         vfree(objs);
 507                 }
 508                 break;
 509
 510         case SN_HWPERF_GET_MMRS:
 511         case SN_HWPERF_SET_MMRS:
 512         case SN_HWPERF_OBJECT_DISTANCE:
 513                 op_info.p = p;
 514                 op_info.a = &a;
 515                 op_info.v0 = &v0;
 516                 op_info.op = op;
 517                 r = sn_hwperf_op_cpu(&op_info);
 518                 break;
 519
 520         default:
 521                 /* all other ops are a direct SAL call */
 522                 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
 523                               a.arg, a.sz, (u64) p, 0, 0, &v0);
 524                 a.v0 = v0;
 525                 break;
 526         }
 527
 528         if (op & SN_HWPERF_OP_MEM_COPYOUT) {
 529                 r = copy_to_user((void *)a.ptr, p, a.sz);
 530                 if (r != 0) {
 531                         r = -EFAULT;
 532                         goto error;
 533                 }
 534         }
 535
 536 error:
 537         if (p)
 538                 vfree(p);
 539
 540         lock_kernel();
 541         return r;
 542 }
 543
 544 static struct file_operations sn_hwperf_fops = {
 545         .ioctl = sn_hwperf_ioctl,
 546 };
 547
 548 static struct miscdevice sn_hwperf_dev = {
 549         MISC_DYNAMIC_MINOR,
 550         "sn_hwperf",
 551         &sn_hwperf_fops
 552 };
 553
 554 static int sn_hwperf_init(void)
 555 {
 556         u64 v;
 557         int salr;
 558         int e = 0;
 559
 560         /* single threaded, once-only initialization */
 561         down(&sn_hwperf_init_mutex);
 562         if (sn_hwperf_salheap) {
 563                 up(&sn_hwperf_init_mutex);
 564                 return e;
 565         }
 566
 567         /*
 568          * The PROM code needs a fixed reference node. For convenience the
 569          * same node as the console I/O is used.
 570          */
 571         sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();
 572
 573         /*
 574          * Request the needed size and install the PROM scratch area.
 575          * The PROM keeps various tracking bits in this memory area.
 576          */
 577         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 578                                  (u64) SN_HWPERF_GET_HEAPSIZE, 0,
 579                                  (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
 580         if (salr != SN_HWPERF_OP_OK) {
 581                 e = -EINVAL;
 582                 goto out;
 583         }
 584
 585         if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
 586                 e = -ENOMEM;
 587                 goto out;
 588         }
 589         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 590                                  SN_HWPERF_INSTALL_HEAP, 0, v,
 591                                  (u64) sn_hwperf_salheap, 0, 0, NULL);
 592         if (salr != SN_HWPERF_OP_OK) {
 593                 e = -EINVAL;
 594                 goto out;
 595         }
 596
 597         salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
 598                                  SN_HWPERF_OBJECT_COUNT, 0,
 599                                  sizeof(u64), (u64) &v, 0, 0, NULL);
 600         if (salr != SN_HWPERF_OP_OK) {
 601                 e = -EINVAL;
 602                 goto out;
 603         }
 604         sn_hwperf_obj_cnt = (int)v;
 605
 606 out:
 607         if (e < 0 && sn_hwperf_salheap) {
 608                 vfree(sn_hwperf_salheap);
 609                 sn_hwperf_salheap = NULL;
 610                 sn_hwperf_obj_cnt = 0;
 611         }
 612
 613         if (!e) {
 614                 /*
 615                  * Register a dynamic misc device for ioctl. Platforms
 616                  * supporting hotplug will create /dev/sn_hwperf, else
 617                  * user can to look up the minor number in /proc/misc.
 618                  */
 619                 if ((e = misc_register(&sn_hwperf_dev)) != 0) {
 620                         printk(KERN_ERR "sn_hwperf_init: misc register "
 621                                "for \"sn_hwperf\" failed, err %d\n", e);
 622                 }
 623         }
 624
 625         up(&sn_hwperf_init_mutex);
 626         return e;
 627 }
 628
 629 int sn_topology_open(struct inode *inode, struct file *file)
 630 {
 631         int e;
 632         struct seq_file *seq;
 633         struct sn_hwperf_object_info *objbuf;
 634         int nobj;
 635
 636         if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
 637                 e = seq_open(file, &sn_topology_seq_ops);
 638                 seq = file->private_data;
 639                 seq->private = objbuf;
 640         }
 641
 642         return e;
 643 }
 644
 645 int sn_topology_release(struct inode *inode, struct file *file)
 646 {
 647         struct seq_file *seq = file->private_data;
 648
 649         if (seq->private)
 650                 vfree(seq->private);
 651         return seq_release(inode, file);
 652 }