1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved. 7 * 8 * SGI Altix topology and hardware performance monitoring API. 9 * Mark Goodwin <markgw@sgi.com>. 10 * 11 * Creates /proc/sgi_sn/sn_topology (read-only) to export 12 * info about Altix nodes, routers, CPUs and NumaLink 13 * interconnection/topology. 14 * 15 * Also creates a dynamic misc device named "sn_hwperf" 16 * that supports an ioctl interface to call down into SAL 17 * to discover hw objects, topology and to read/write 18 * memory mapped registers, e.g. for performance monitoring. 19 * The "sn_hwperf" device is registered only after the procfs 20 * file is first opened, i.e. only if/when it's needed. 21 * 22 * This API is used by SGI Performance Co-Pilot and other 23 * tools, see http://oss.sgi.com/projects/pcp 24 */ 25 26#include <linux/fs.h> 27#include <linux/slab.h> 28#include <linux/vmalloc.h> 29#include <linux/seq_file.h> 30#include <linux/miscdevice.h> 31#include <linux/utsname.h> 32#include <linux/cpumask.h> 33#include <linux/nodemask.h> 34#include <linux/smp.h> 35#include <linux/mutex.h> 36 37#include <asm/processor.h> 38#include <asm/topology.h> 39#include <asm/uaccess.h> 40#include <asm/sal.h> 41#include <asm/sn/io.h> 42#include <asm/sn/sn_sal.h> 43#include <asm/sn/module.h> 44#include <asm/sn/geo.h> 45#include <asm/sn/sn2/sn_hwperf.h> 46#include <asm/sn/addrs.h> 47 48static void *sn_hwperf_salheap = NULL; 49static int sn_hwperf_obj_cnt = 0; 50static nasid_t sn_hwperf_master_nasid = INVALID_NASID; 51static int sn_hwperf_init(void); 52static DEFINE_MUTEX(sn_hwperf_init_mutex); 53 54#define cnode_possible(n) ((n) < num_cnodes) 55 56static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret) 57{ 58 int e; 59 u64 sz; 60 struct sn_hwperf_object_info *objbuf = NULL; 61 62 if ((e = sn_hwperf_init()) < 0) { 63 printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e); 64 goto out; 65 } 66 67 sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info); 68 objbuf = vmalloc(sz); 69 if (objbuf == NULL) { 70 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz); 71 e = -ENOMEM; 72 goto out; 73 } 74 75 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS, 76 0, sz, (u64) objbuf, 0, 0, NULL); 77 if (e != SN_HWPERF_OP_OK) { 78 e = -EINVAL; 79 vfree(objbuf); 80 } 81 82out: 83 *nobj = sn_hwperf_obj_cnt; 84 *ret = objbuf; 85 return e; 86} 87 88static int sn_hwperf_location_to_bpos(char *location, 89 int *rack, int *bay, int *slot, int *slab) 90{ 91 char type; 92 93 /* first scan for an old style geoid string */ 94 if (sscanf(location, "%03d%c%02d#%d", 95 rack, &type, bay, slab) == 4) 96 *slot = 0; 97 else /* scan for a new bladed geoid string */ 98 if (sscanf(location, "%03d%c%02d^%02d#%d", 99 rack, &type, bay, slot, slab) != 5) 100 return -1; 101 /* success */ 102 return 0; 103} 104 105static int sn_hwperf_geoid_to_cnode(char *location) 106{ 107 int cnode; 108 geoid_t geoid; 109 moduleid_t module_id; 110 int rack, bay, slot, slab; 111 int this_rack, this_bay, this_slot, this_slab; 112 113 if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab)) 114 return -1; 115 116 for (cnode = 0; cnode < num_cnodes; cnode++) { 117 geoid = cnodeid_get_geoid(cnode); 118 module_id = geo_module(geoid); 119 this_rack = MODULE_GET_RACK(module_id); 120 this_bay = MODULE_GET_BPOS(module_id); 121 this_slot = geo_slot(geoid); 122 this_slab = geo_slab(geoid); 123 if (rack == this_rack && bay == this_bay && 124 slot == this_slot && slab == this_slab) { 125 break; 126 } 127 } 128 129 return cnode_possible(cnode) ? cnode : -1; 130} 131 132static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj) 133{ 134 if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)) 135 BUG(); 136 if (SN_HWPERF_FOREIGN(obj)) 137 return -1; 138 return sn_hwperf_geoid_to_cnode(obj->location); 139} 140 141static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj, 142 struct sn_hwperf_object_info *objs) 143{ 144 int ordinal; 145 struct sn_hwperf_object_info *p; 146 147 for (ordinal=0, p=objs; p != obj; p++) { 148 if (SN_HWPERF_FOREIGN(p)) 149 continue; 150 if (SN_HWPERF_SAME_OBJTYPE(p, obj)) 151 ordinal++; 152 } 153 154 return ordinal; 155} 156 157static const char *slabname_node = "node"; /* SHub asic */ 158static const char *slabname_ionode = "ionode"; /* TIO asic */ 159static const char *slabname_router = "router"; /* NL3R or NL4R */ 160static const char *slabname_other = "other"; /* unknown asic */ 161 162static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj, 163 struct sn_hwperf_object_info *objs, int *ordinal) 164{ 165 int isnode; 166 const char *slabname = slabname_other; 167 168 if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) { 169 slabname = isnode ? slabname_node : slabname_ionode; 170 *ordinal = sn_hwperf_obj_to_cnode(obj); 171 } 172 else { 173 *ordinal = sn_hwperf_generic_ordinal(obj, objs); 174 if (SN_HWPERF_IS_ROUTER(obj)) 175 slabname = slabname_router; 176 } 177 178 return slabname; 179} 180 181static void print_pci_topology(struct seq_file *s) 182{ 183 char *p; 184 size_t sz; 185 int e; 186 187 for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) { 188 if (!(p = kmalloc(sz, GFP_KERNEL))) 189 break; 190 e = ia64_sn_ioif_get_pci_topology(__pa(p), sz); 191 if (e == SALRET_OK) 192 seq_puts(s, p); 193 kfree(p); 194 if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED) 195 break; 196 } 197} 198 199static inline int sn_hwperf_has_cpus(cnodeid_t node) 200{ 201 return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node); 202} 203 204static inline int sn_hwperf_has_mem(cnodeid_t node) 205{ 206 return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages; 207} 208 209static struct sn_hwperf_object_info * 210sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf, 211 int nobj, int id) 212{ 213 int i; 214 struct sn_hwperf_object_info *p = objbuf; 215 216 for (i=0; i < nobj; i++, p++) { 217 if (p->id == id) 218 return p; 219 } 220 221 return NULL; 222 223} 224 225static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf, 226 int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node) 227{ 228 int e; 229 struct sn_hwperf_object_info *nodeobj = NULL; 230 struct sn_hwperf_object_info *op; 231 struct sn_hwperf_object_info *dest; 232 struct sn_hwperf_object_info *router; 233 struct sn_hwperf_port_info ptdata[16]; 234 int sz, i, j; 235 cnodeid_t c; 236 int found_mem = 0; 237 int found_cpu = 0; 238 239 if (!cnode_possible(node)) 240 return -EINVAL; 241 242 if (sn_hwperf_has_cpus(node)) { 243 if (near_cpu_node) 244 *near_cpu_node = node; 245 found_cpu++; 246 } 247 248 if (sn_hwperf_has_mem(node)) { 249 if (near_mem_node) 250 *near_mem_node = node; 251 found_mem++; 252 } 253 254 if (found_cpu && found_mem) 255 return 0; /* trivially successful */ 256 257 /* find the argument node object */ 258 for (i=0, op=objbuf; i < nobj; i++, op++) { 259 if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op)) 260 continue; 261 if (node == sn_hwperf_obj_to_cnode(op)) { 262 nodeobj = op; 263 break; 264 } 265 } 266 if (!nodeobj) { 267 e = -ENOENT; 268 goto err; 269 } 270 271 /* get it's interconnect topology */ 272 sz = op->ports * sizeof(struct sn_hwperf_port_info); 273 BUG_ON(sz > sizeof(ptdata)); 274 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 275 SN_HWPERF_ENUM_PORTS, nodeobj->id, sz, 276 (u64)&ptdata, 0, 0, NULL); 277 if (e != SN_HWPERF_OP_OK) { 278 e = -EINVAL; 279 goto err; 280 } 281 282 /* find nearest node with cpus and nearest memory */ 283 for (router=NULL, j=0; j < op->ports; j++) { 284 dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id); 285 if (dest && SN_HWPERF_IS_ROUTER(dest)) 286 router = dest; 287 if (!dest || SN_HWPERF_FOREIGN(dest) || 288 !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) { 289 continue; 290 } 291 c = sn_hwperf_obj_to_cnode(dest); 292 if (!found_cpu && sn_hwperf_has_cpus(c)) { 293 if (near_cpu_node) 294 *near_cpu_node = c; 295 found_cpu++; 296 } 297 if (!found_mem && sn_hwperf_has_mem(c)) { 298 if (near_mem_node) 299 *near_mem_node = c; 300 found_mem++; 301 } 302 } 303 304 if (router && (!found_cpu || !found_mem)) { 305 /* search for a node connected to the same router */ 306 sz = router->ports * sizeof(struct sn_hwperf_port_info); 307 BUG_ON(sz > sizeof(ptdata)); 308 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 309 SN_HWPERF_ENUM_PORTS, router->id, sz, 310 (u64)&ptdata, 0, 0, NULL); 311 if (e != SN_HWPERF_OP_OK) { 312 e = -EINVAL; 313 goto err; 314 } 315 for (j=0; j < router->ports; j++) { 316 dest = sn_hwperf_findobj_id(objbuf, nobj, 317 ptdata[j].conn_id); 318 if (!dest || dest->id == node || 319 SN_HWPERF_FOREIGN(dest) || 320 !SN_HWPERF_IS_NODE(dest) || 321 SN_HWPERF_IS_IONODE(dest)) { 322 continue; 323 } 324 c = sn_hwperf_obj_to_cnode(dest); 325 if (!found_cpu && sn_hwperf_has_cpus(c)) { 326 if (near_cpu_node) 327 *near_cpu_node = c; 328 found_cpu++; 329 } 330 if (!found_mem && sn_hwperf_has_mem(c)) { 331 if (near_mem_node) 332 *near_mem_node = c; 333 found_mem++; 334 } 335 if (found_cpu && found_mem) 336 break; 337 } 338 } 339 340 if (!found_cpu || !found_mem) { 341 /* resort to _any_ node with CPUs and memory */ 342 for (i=0, op=objbuf; i < nobj; i++, op++) { 343 if (SN_HWPERF_FOREIGN(op) || 344 SN_HWPERF_IS_IONODE(op) || 345 !SN_HWPERF_IS_NODE(op)) { 346 continue; 347 } 348 c = sn_hwperf_obj_to_cnode(op); 349 if (!found_cpu && sn_hwperf_has_cpus(c)) { 350 if (near_cpu_node) 351 *near_cpu_node = c; 352 found_cpu++; 353 } 354 if (!found_mem && sn_hwperf_has_mem(c)) { 355 if (near_mem_node) 356 *near_mem_node = c; 357 found_mem++; 358 } 359 if (found_cpu && found_mem) 360 break; 361 } 362 } 363 364 if (!found_cpu || !found_mem) 365 e = -ENODATA; 366 367err: 368 return e; 369} 370 371 372static int sn_topology_show(struct seq_file *s, void *d) 373{ 374 int sz; 375 int pt; 376 int e = 0; 377 int i; 378 int j; 379 const char *slabname; 380 int ordinal; 381 char slice; 382 struct cpuinfo_ia64 *c; 383 struct sn_hwperf_port_info *ptdata; 384 struct sn_hwperf_object_info *p; 385 struct sn_hwperf_object_info *obj = d; /* this object */ 386 struct sn_hwperf_object_info *objs = s->private; /* all objects */ 387 u8 shubtype; 388 u8 system_size; 389 u8 sharing_size; 390 u8 partid; 391 u8 coher; 392 u8 nasid_shift; 393 u8 region_size; 394 u16 nasid_mask; 395 int nasid_msb; 396 397 if (obj == objs) { 398 seq_printf(s, "# sn_topology version 2\n"); 399 seq_printf(s, "# objtype ordinal location partition" 400 " [attribute value [, ...]]\n"); 401 402 if (ia64_sn_get_sn_info(0, 403 &shubtype, &nasid_mask, &nasid_shift, &system_size, 404 &sharing_size, &partid, &coher, ®ion_size)) 405 BUG(); 406 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) { 407 if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb)) 408 break; 409 } 410 seq_printf(s, "partition %u %s local " 411 "shubtype %s, " 412 "nasid_mask 0x%016llx, " 413 "nasid_bits %d:%d, " 414 "system_size %d, " 415 "sharing_size %d, " 416 "coherency_domain %d, " 417 "region_size %d\n", 418 419 partid, utsname()->nodename, 420 shubtype ? "shub2" : "shub1", 421 (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift, 422 system_size, sharing_size, coher, region_size); 423 424 print_pci_topology(s); 425 } 426 427 if (SN_HWPERF_FOREIGN(obj)) { 428 /* private in another partition: not interesting */ 429 return 0; 430 } 431 432 for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) { 433 if (obj->name[i] == ' ') 434 obj->name[i] = '_'; 435 } 436 437 slabname = sn_hwperf_get_slabname(obj, objs, &ordinal); 438 seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location, 439 obj->sn_hwp_this_part ? "local" : "shared", obj->name); 440 441 if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))) 442 seq_putc(s, '\n'); 443 else { 444 cnodeid_t near_mem = -1; 445 cnodeid_t near_cpu = -1; 446 447 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal)); 448 449 if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt, 450 ordinal, &near_mem, &near_cpu) == 0) { 451 seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d", 452 near_mem, near_cpu); 453 } 454 455 if (!SN_HWPERF_IS_IONODE(obj)) { 456 for_each_online_node(i) { 457 seq_printf(s, i ? ":%d" : ", dist %d", 458 node_distance(ordinal, i)); 459 } 460 } 461 462 seq_putc(s, '\n'); 463 464 /* 465 * CPUs on this node, if any 466 */ 467 if (!SN_HWPERF_IS_IONODE(obj)) { 468 for_each_cpu_and(i, cpu_online_mask, 469 cpumask_of_node(ordinal)) { 470 slice = 'a' + cpuid_to_slice(i); 471 c = cpu_data(i); 472 seq_printf(s, "cpu %d %s%c local" 473 " freq %luMHz, arch ia64", 474 i, obj->location, slice, 475 c->proc_freq / 1000000); 476 for_each_online_cpu(j) { 477 seq_printf(s, j ? ":%d" : ", dist %d", 478 node_distance( 479 cpu_to_node(i), 480 cpu_to_node(j))); 481 } 482 seq_putc(s, '\n'); 483 } 484 } 485 } 486 487 if (obj->ports) { 488 /* 489 * numalink ports 490 */ 491 sz = obj->ports * sizeof(struct sn_hwperf_port_info); 492 if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL) 493 return -ENOMEM; 494 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 495 SN_HWPERF_ENUM_PORTS, obj->id, sz, 496 (u64) ptdata, 0, 0, NULL); 497 if (e != SN_HWPERF_OP_OK) 498 return -EINVAL; 499 for (ordinal=0, p=objs; p != obj; p++) { 500 if (!SN_HWPERF_FOREIGN(p)) 501 ordinal += p->ports; 502 } 503 for (pt = 0; pt < obj->ports; pt++) { 504 for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) { 505 if (ptdata[pt].conn_id == p->id) { 506 break; 507 } 508 } 509 seq_printf(s, "numalink %d %s-%d", 510 ordinal+pt, obj->location, ptdata[pt].port); 511 512 if (i >= sn_hwperf_obj_cnt) { 513 /* no connection */ 514 seq_puts(s, " local endpoint disconnected" 515 ", protocol unknown\n"); 516 continue; 517 } 518 519 if (obj->sn_hwp_this_part && p->sn_hwp_this_part) 520 /* both ends local to this partition */ 521 seq_puts(s, " local"); 522 else if (SN_HWPERF_FOREIGN(p)) 523 /* both ends of the link in foreign partiton */ 524 seq_puts(s, " foreign"); 525 else 526 /* link straddles a partition */ 527 seq_puts(s, " shared"); 528 529 /* 530 * Unlikely, but strictly should query the LLP config 531 * registers because an NL4R can be configured to run 532 * NL3 protocol, even when not talking to an NL3 router. 533 * Ditto for node-node. 534 */ 535 seq_printf(s, " endpoint %s-%d, protocol %s\n", 536 p->location, ptdata[pt].conn_port, 537 (SN_HWPERF_IS_NL3ROUTER(obj) || 538 SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4"); 539 } 540 kfree(ptdata); 541 } 542 543 return 0; 544} 545 546static void *sn_topology_start(struct seq_file *s, loff_t * pos) 547{ 548 struct sn_hwperf_object_info *objs = s->private; 549 550 if (*pos < sn_hwperf_obj_cnt) 551 return (void *)(objs + *pos); 552 553 return NULL; 554} 555 556static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos) 557{ 558 ++*pos; 559 return sn_topology_start(s, pos); 560} 561 562static void sn_topology_stop(struct seq_file *m, void *v) 563{ 564 return; 565} 566 567/* 568 * /proc/sgi_sn/sn_topology, read-only using seq_file 569 */ 570static const struct seq_operations sn_topology_seq_ops = { 571 .start = sn_topology_start, 572 .next = sn_topology_next, 573 .stop = sn_topology_stop, 574 .show = sn_topology_show 575}; 576 577struct sn_hwperf_op_info { 578 u64 op; 579 struct sn_hwperf_ioctl_args *a; 580 void *p; 581 int *v0; 582 int ret; 583}; 584 585static void sn_hwperf_call_sal(void *info) 586{ 587 struct sn_hwperf_op_info *op_info = info; 588 int r; 589 590 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op, 591 op_info->a->arg, op_info->a->sz, 592 (u64) op_info->p, 0, 0, op_info->v0); 593 op_info->ret = r; 594} 595 596static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info) 597{ 598 u32 cpu; 599 u32 use_ipi; 600 int r = 0; 601 cpumask_t save_allowed; 602 603 cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32; 604 use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK; 605 op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK; 606 607 if (cpu != SN_HWPERF_ARG_ANY_CPU) { 608 if (cpu >= nr_cpu_ids || !cpu_online(cpu)) { 609 r = -EINVAL; 610 goto out; 611 } 612 } 613 614 if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) { 615 /* don't care, or already on correct cpu */ 616 sn_hwperf_call_sal(op_info); 617 } 618 else { 619 if (use_ipi) { 620 /* use an interprocessor interrupt to call SAL */ 621 smp_call_function_single(cpu, sn_hwperf_call_sal, 622 op_info, 1); 623 } 624 else { 625 /* migrate the task before calling SAL */ 626 save_allowed = current->cpus_allowed; 627 set_cpus_allowed_ptr(current, cpumask_of(cpu)); 628 sn_hwperf_call_sal(op_info); 629 set_cpus_allowed_ptr(current, &save_allowed); 630 } 631 } 632 r = op_info->ret; 633 634out: 635 return r; 636} 637 638/* map SAL hwperf error code to system error code */ 639static int sn_hwperf_map_err(int hwperf_err) 640{ 641 int e; 642 643 switch(hwperf_err) { 644 case SN_HWPERF_OP_OK: 645 e = 0; 646 break; 647 648 case SN_HWPERF_OP_NOMEM: 649 e = -ENOMEM; 650 break; 651 652 case SN_HWPERF_OP_NO_PERM: 653 e = -EPERM; 654 break; 655 656 case SN_HWPERF_OP_IO_ERROR: 657 e = -EIO; 658 break; 659 660 case SN_HWPERF_OP_BUSY: 661 e = -EBUSY; 662 break; 663 664 case SN_HWPERF_OP_RECONFIGURE: 665 e = -EAGAIN; 666 break; 667 668 case SN_HWPERF_OP_INVAL: 669 default: 670 e = -EINVAL; 671 break; 672 } 673 674 return e; 675} 676 677/* 678 * ioctl for "sn_hwperf" misc device 679 */ 680static long sn_hwperf_ioctl(struct file *fp, u32 op, unsigned long arg) 681{ 682 struct sn_hwperf_ioctl_args a; 683 struct cpuinfo_ia64 *cdata; 684 struct sn_hwperf_object_info *objs; 685 struct sn_hwperf_object_info *cpuobj; 686 struct sn_hwperf_op_info op_info; 687 void *p = NULL; 688 int nobj; 689 char slice; 690 int node; 691 int r; 692 int v0; 693 int i; 694 int j; 695 696 /* only user requests are allowed here */ 697 if ((op & SN_HWPERF_OP_MASK) < 10) { 698 r = -EINVAL; 699 goto error; 700 } 701 r = copy_from_user(&a, (const void __user *)arg, 702 sizeof(struct sn_hwperf_ioctl_args)); 703 if (r != 0) { 704 r = -EFAULT; 705 goto error; 706 } 707 708 /* 709 * Allocate memory to hold a kernel copy of the user buffer. The 710 * buffer contents are either copied in or out (or both) of user 711 * space depending on the flags encoded in the requested operation. 712 */ 713 if (a.ptr) { 714 p = vmalloc(a.sz); 715 if (!p) { 716 r = -ENOMEM; 717 goto error; 718 } 719 } 720 721 if (op & SN_HWPERF_OP_MEM_COPYIN) { 722 r = copy_from_user(p, (const void __user *)a.ptr, a.sz); 723 if (r != 0) { 724 r = -EFAULT; 725 goto error; 726 } 727 } 728 729 switch (op) { 730 case SN_HWPERF_GET_CPU_INFO: 731 if (a.sz == sizeof(u64)) { 732 /* special case to get size needed */ 733 *(u64 *) p = (u64) num_online_cpus() * 734 sizeof(struct sn_hwperf_object_info); 735 } else 736 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) { 737 r = -ENOMEM; 738 goto error; 739 } else 740 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { 741 int cpuobj_index = 0; 742 743 memset(p, 0, a.sz); 744 for (i = 0; i < nobj; i++) { 745 if (!SN_HWPERF_IS_NODE(objs + i)) 746 continue; 747 node = sn_hwperf_obj_to_cnode(objs + i); 748 for_each_online_cpu(j) { 749 if (node != cpu_to_node(j)) 750 continue; 751 cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++; 752 slice = 'a' + cpuid_to_slice(j); 753 cdata = cpu_data(j); 754 cpuobj->id = j; 755 snprintf(cpuobj->name, 756 sizeof(cpuobj->name), 757 "CPU %luMHz %s", 758 cdata->proc_freq / 1000000, 759 cdata->vendor); 760 snprintf(cpuobj->location, 761 sizeof(cpuobj->location), 762 "%s%c", objs[i].location, 763 slice); 764 } 765 } 766 767 vfree(objs); 768 } 769 break; 770 771 case SN_HWPERF_GET_NODE_NASID: 772 if (a.sz != sizeof(u64) || 773 (node = a.arg) < 0 || !cnode_possible(node)) { 774 r = -EINVAL; 775 goto error; 776 } 777 *(u64 *)p = (u64)cnodeid_to_nasid(node); 778 break; 779 780 case SN_HWPERF_GET_OBJ_NODE: 781 i = a.arg; 782 if (a.sz != sizeof(u64) || i < 0) { 783 r = -EINVAL; 784 goto error; 785 } 786 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { 787 if (i >= nobj) { 788 r = -EINVAL; 789 vfree(objs); 790 goto error; 791 } 792 if (objs[i].id != a.arg) { 793 for (i = 0; i < nobj; i++) { 794 if (objs[i].id == a.arg) 795 break; 796 } 797 } 798 if (i == nobj) { 799 r = -EINVAL; 800 vfree(objs); 801 goto error; 802 } 803 804 if (!SN_HWPERF_IS_NODE(objs + i) && 805 !SN_HWPERF_IS_IONODE(objs + i)) { 806 r = -ENOENT; 807 vfree(objs); 808 goto error; 809 } 810 811 *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i); 812 vfree(objs); 813 } 814 break; 815 816 case SN_HWPERF_GET_MMRS: 817 case SN_HWPERF_SET_MMRS: 818 case SN_HWPERF_OBJECT_DISTANCE: 819 op_info.p = p; 820 op_info.a = &a; 821 op_info.v0 = &v0; 822 op_info.op = op; 823 r = sn_hwperf_op_cpu(&op_info); 824 if (r) { 825 r = sn_hwperf_map_err(r); 826 a.v0 = v0; 827 goto error; 828 } 829 break; 830 831 default: 832 /* all other ops are a direct SAL call */ 833 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op, 834 a.arg, a.sz, (u64) p, 0, 0, &v0); 835 if (r) { 836 r = sn_hwperf_map_err(r); 837 goto error; 838 } 839 a.v0 = v0; 840 break; 841 } 842 843 if (op & SN_HWPERF_OP_MEM_COPYOUT) { 844 r = copy_to_user((void __user *)a.ptr, p, a.sz); 845 if (r != 0) { 846 r = -EFAULT; 847 goto error; 848 } 849 } 850 851error: 852 vfree(p); 853 854 return r; 855} 856 857static const struct file_operations sn_hwperf_fops = { 858 .unlocked_ioctl = sn_hwperf_ioctl, 859}; 860 861static struct miscdevice sn_hwperf_dev = { 862 MISC_DYNAMIC_MINOR, 863 "sn_hwperf", 864 &sn_hwperf_fops 865}; 866 867static int sn_hwperf_init(void) 868{ 869 u64 v; 870 int salr; 871 int e = 0; 872 873 /* single threaded, once-only initialization */ 874 mutex_lock(&sn_hwperf_init_mutex); 875 876 if (sn_hwperf_salheap) { 877 mutex_unlock(&sn_hwperf_init_mutex); 878 return e; 879 } 880 881 /* 882 * The PROM code needs a fixed reference node. For convenience the 883 * same node as the console I/O is used. 884 */ 885 sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid(); 886 887 /* 888 * Request the needed size and install the PROM scratch area. 889 * The PROM keeps various tracking bits in this memory area. 890 */ 891 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 892 (u64) SN_HWPERF_GET_HEAPSIZE, 0, 893 (u64) sizeof(u64), (u64) &v, 0, 0, NULL); 894 if (salr != SN_HWPERF_OP_OK) { 895 e = -EINVAL; 896 goto out; 897 } 898 899 if ((sn_hwperf_salheap = vmalloc(v)) == NULL) { 900 e = -ENOMEM; 901 goto out; 902 } 903 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 904 SN_HWPERF_INSTALL_HEAP, 0, v, 905 (u64) sn_hwperf_salheap, 0, 0, NULL); 906 if (salr != SN_HWPERF_OP_OK) { 907 e = -EINVAL; 908 goto out; 909 } 910 911 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 912 SN_HWPERF_OBJECT_COUNT, 0, 913 sizeof(u64), (u64) &v, 0, 0, NULL); 914 if (salr != SN_HWPERF_OP_OK) { 915 e = -EINVAL; 916 goto out; 917 } 918 sn_hwperf_obj_cnt = (int)v; 919 920out: 921 if (e < 0 && sn_hwperf_salheap) { 922 vfree(sn_hwperf_salheap); 923 sn_hwperf_salheap = NULL; 924 sn_hwperf_obj_cnt = 0; 925 } 926 mutex_unlock(&sn_hwperf_init_mutex); 927 return e; 928} 929 930int sn_topology_open(struct inode *inode, struct file *file) 931{ 932 int e; 933 struct seq_file *seq; 934 struct sn_hwperf_object_info *objbuf; 935 int nobj; 936 937 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) { 938 e = seq_open(file, &sn_topology_seq_ops); 939 seq = file->private_data; 940 seq->private = objbuf; 941 } 942 943 return e; 944} 945 946int sn_topology_release(struct inode *inode, struct file *file) 947{ 948 struct seq_file *seq = file->private_data; 949 950 vfree(seq->private); 951 return seq_release(inode, file); 952} 953 954int sn_hwperf_get_nearest_node(cnodeid_t node, 955 cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node) 956{ 957 int e; 958 int nobj; 959 struct sn_hwperf_object_info *objbuf; 960 961 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) { 962 e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj, 963 node, near_mem_node, near_cpu_node); 964 vfree(objbuf); 965 } 966 967 return e; 968} 969 970static int __devinit sn_hwperf_misc_register_init(void) 971{ 972 int e; 973 974 if (!ia64_platform_is("sn2")) 975 return 0; 976 977 sn_hwperf_init(); 978 979 /* 980 * Register a dynamic misc device for hwperf ioctls. Platforms 981 * supporting hotplug will create /dev/sn_hwperf, else user 982 * can to look up the minor number in /proc/misc. 983 */ 984 if ((e = misc_register(&sn_hwperf_dev)) != 0) { 985 printk(KERN_ERR "sn_hwperf_misc_register_init: failed to " 986 "register misc device for \"%s\"\n", sn_hwperf_dev.name); 987 } 988 989 return e; 990} 991 992device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */ 993EXPORT_SYMBOL(sn_hwperf_get_nearest_node); 994