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/export.h> 29#include <linux/vmalloc.h> 30#include <linux/seq_file.h> 31#include <linux/miscdevice.h> 32#include <linux/utsname.h> 33#include <linux/cpumask.h> 34#include <linux/nodemask.h> 35#include <linux/smp.h> 36#include <linux/mutex.h> 37 38#include <asm/processor.h> 39#include <asm/topology.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 49static void *sn_hwperf_salheap = NULL; 50static int sn_hwperf_obj_cnt = 0; 51static nasid_t sn_hwperf_master_nasid = INVALID_NASID; 52static int sn_hwperf_init(void); 53static DEFINE_MUTEX(sn_hwperf_init_mutex); 54 55#define cnode_possible(n) ((n) < num_cnodes) 56 57static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret) 58{ 59 int e; 60 u64 sz; 61 struct sn_hwperf_object_info *objbuf = NULL; 62 63 if ((e = sn_hwperf_init()) < 0) { 64 printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e); 65 goto out; 66 } 67 68 sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info); 69 objbuf = vmalloc(sz); 70 if (objbuf == NULL) { 71 printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz); 72 e = -ENOMEM; 73 goto out; 74 } 75 76 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS, 77 0, sz, (u64) objbuf, 0, 0, NULL); 78 if (e != SN_HWPERF_OP_OK) { 79 e = -EINVAL; 80 vfree(objbuf); 81 } 82 83out: 84 *nobj = sn_hwperf_obj_cnt; 85 *ret = objbuf; 86 return e; 87} 88 89static int sn_hwperf_location_to_bpos(char *location, 90 int *rack, int *bay, int *slot, int *slab) 91{ 92 char type; 93 94 /* first scan for an old style geoid string */ 95 if (sscanf(location, "%03d%c%02d#%d", 96 rack, &type, bay, slab) == 4) 97 *slot = 0; 98 else /* scan for a new bladed geoid string */ 99 if (sscanf(location, "%03d%c%02d^%02d#%d", 100 rack, &type, bay, slot, slab) != 5) 101 return -1; 102 /* success */ 103 return 0; 104} 105 106static int sn_hwperf_geoid_to_cnode(char *location) 107{ 108 int cnode; 109 geoid_t geoid; 110 moduleid_t module_id; 111 int rack, bay, slot, slab; 112 int this_rack, this_bay, this_slot, this_slab; 113 114 if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab)) 115 return -1; 116 117 /* 118 * FIXME: replace with cleaner for_each_XXX macro which addresses 119 * both compute and IO nodes once ACPI3.0 is available. 120 */ 121 for (cnode = 0; cnode < num_cnodes; cnode++) { 122 geoid = cnodeid_get_geoid(cnode); 123 module_id = geo_module(geoid); 124 this_rack = MODULE_GET_RACK(module_id); 125 this_bay = MODULE_GET_BPOS(module_id); 126 this_slot = geo_slot(geoid); 127 this_slab = geo_slab(geoid); 128 if (rack == this_rack && bay == this_bay && 129 slot == this_slot && slab == this_slab) { 130 break; 131 } 132 } 133 134 return cnode_possible(cnode) ? cnode : -1; 135} 136 137static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj) 138{ 139 if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)) 140 BUG(); 141 if (SN_HWPERF_FOREIGN(obj)) 142 return -1; 143 return sn_hwperf_geoid_to_cnode(obj->location); 144} 145 146static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj, 147 struct sn_hwperf_object_info *objs) 148{ 149 int ordinal; 150 struct sn_hwperf_object_info *p; 151 152 for (ordinal=0, p=objs; p != obj; p++) { 153 if (SN_HWPERF_FOREIGN(p)) 154 continue; 155 if (SN_HWPERF_SAME_OBJTYPE(p, obj)) 156 ordinal++; 157 } 158 159 return ordinal; 160} 161 162static const char *slabname_node = "node"; /* SHub asic */ 163static const char *slabname_ionode = "ionode"; /* TIO asic */ 164static const char *slabname_router = "router"; /* NL3R or NL4R */ 165static const char *slabname_other = "other"; /* unknown asic */ 166 167static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj, 168 struct sn_hwperf_object_info *objs, int *ordinal) 169{ 170 int isnode; 171 const char *slabname = slabname_other; 172 173 if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) { 174 slabname = isnode ? slabname_node : slabname_ionode; 175 *ordinal = sn_hwperf_obj_to_cnode(obj); 176 } 177 else { 178 *ordinal = sn_hwperf_generic_ordinal(obj, objs); 179 if (SN_HWPERF_IS_ROUTER(obj)) 180 slabname = slabname_router; 181 } 182 183 return slabname; 184} 185 186static void print_pci_topology(struct seq_file *s) 187{ 188 char *p; 189 size_t sz; 190 int e; 191 192 for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) { 193 if (!(p = kmalloc(sz, GFP_KERNEL))) 194 break; 195 e = ia64_sn_ioif_get_pci_topology(__pa(p), sz); 196 if (e == SALRET_OK) 197 seq_puts(s, p); 198 kfree(p); 199 if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED) 200 break; 201 } 202} 203 204static inline int sn_hwperf_has_cpus(cnodeid_t node) 205{ 206 return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node); 207} 208 209static inline int sn_hwperf_has_mem(cnodeid_t node) 210{ 211 return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages; 212} 213 214static struct sn_hwperf_object_info * 215sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf, 216 int nobj, int id) 217{ 218 int i; 219 struct sn_hwperf_object_info *p = objbuf; 220 221 for (i=0; i < nobj; i++, p++) { 222 if (p->id == id) 223 return p; 224 } 225 226 return NULL; 227 228} 229 230static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf, 231 int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node) 232{ 233 int e; 234 struct sn_hwperf_object_info *nodeobj = NULL; 235 struct sn_hwperf_object_info *op; 236 struct sn_hwperf_object_info *dest; 237 struct sn_hwperf_object_info *router; 238 struct sn_hwperf_port_info ptdata[16]; 239 int sz, i, j; 240 cnodeid_t c; 241 int found_mem = 0; 242 int found_cpu = 0; 243 244 if (!cnode_possible(node)) 245 return -EINVAL; 246 247 if (sn_hwperf_has_cpus(node)) { 248 if (near_cpu_node) 249 *near_cpu_node = node; 250 found_cpu++; 251 } 252 253 if (sn_hwperf_has_mem(node)) { 254 if (near_mem_node) 255 *near_mem_node = node; 256 found_mem++; 257 } 258 259 if (found_cpu && found_mem) 260 return 0; /* trivially successful */ 261 262 /* find the argument node object */ 263 for (i=0, op=objbuf; i < nobj; i++, op++) { 264 if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op)) 265 continue; 266 if (node == sn_hwperf_obj_to_cnode(op)) { 267 nodeobj = op; 268 break; 269 } 270 } 271 if (!nodeobj) { 272 e = -ENOENT; 273 goto err; 274 } 275 276 /* get it's interconnect topology */ 277 sz = op->ports * sizeof(struct sn_hwperf_port_info); 278 BUG_ON(sz > sizeof(ptdata)); 279 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 280 SN_HWPERF_ENUM_PORTS, nodeobj->id, sz, 281 (u64)&ptdata, 0, 0, NULL); 282 if (e != SN_HWPERF_OP_OK) { 283 e = -EINVAL; 284 goto err; 285 } 286 287 /* find nearest node with cpus and nearest memory */ 288 for (router=NULL, j=0; j < op->ports; j++) { 289 dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id); 290 if (dest && SN_HWPERF_IS_ROUTER(dest)) 291 router = dest; 292 if (!dest || SN_HWPERF_FOREIGN(dest) || 293 !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) { 294 continue; 295 } 296 c = sn_hwperf_obj_to_cnode(dest); 297 if (!found_cpu && sn_hwperf_has_cpus(c)) { 298 if (near_cpu_node) 299 *near_cpu_node = c; 300 found_cpu++; 301 } 302 if (!found_mem && sn_hwperf_has_mem(c)) { 303 if (near_mem_node) 304 *near_mem_node = c; 305 found_mem++; 306 } 307 } 308 309 if (router && (!found_cpu || !found_mem)) { 310 /* search for a node connected to the same router */ 311 sz = router->ports * sizeof(struct sn_hwperf_port_info); 312 BUG_ON(sz > sizeof(ptdata)); 313 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 314 SN_HWPERF_ENUM_PORTS, router->id, sz, 315 (u64)&ptdata, 0, 0, NULL); 316 if (e != SN_HWPERF_OP_OK) { 317 e = -EINVAL; 318 goto err; 319 } 320 for (j=0; j < router->ports; j++) { 321 dest = sn_hwperf_findobj_id(objbuf, nobj, 322 ptdata[j].conn_id); 323 if (!dest || dest->id == node || 324 SN_HWPERF_FOREIGN(dest) || 325 !SN_HWPERF_IS_NODE(dest) || 326 SN_HWPERF_IS_IONODE(dest)) { 327 continue; 328 } 329 c = sn_hwperf_obj_to_cnode(dest); 330 if (!found_cpu && sn_hwperf_has_cpus(c)) { 331 if (near_cpu_node) 332 *near_cpu_node = c; 333 found_cpu++; 334 } 335 if (!found_mem && sn_hwperf_has_mem(c)) { 336 if (near_mem_node) 337 *near_mem_node = c; 338 found_mem++; 339 } 340 if (found_cpu && found_mem) 341 break; 342 } 343 } 344 345 if (!found_cpu || !found_mem) { 346 /* resort to _any_ node with CPUs and memory */ 347 for (i=0, op=objbuf; i < nobj; i++, op++) { 348 if (SN_HWPERF_FOREIGN(op) || 349 SN_HWPERF_IS_IONODE(op) || 350 !SN_HWPERF_IS_NODE(op)) { 351 continue; 352 } 353 c = sn_hwperf_obj_to_cnode(op); 354 if (!found_cpu && sn_hwperf_has_cpus(c)) { 355 if (near_cpu_node) 356 *near_cpu_node = c; 357 found_cpu++; 358 } 359 if (!found_mem && sn_hwperf_has_mem(c)) { 360 if (near_mem_node) 361 *near_mem_node = c; 362 found_mem++; 363 } 364 if (found_cpu && found_mem) 365 break; 366 } 367 } 368 369 if (!found_cpu || !found_mem) 370 e = -ENODATA; 371 372err: 373 return e; 374} 375 376 377static int sn_topology_show(struct seq_file *s, void *d) 378{ 379 int sz; 380 int pt; 381 int e = 0; 382 int i; 383 int j; 384 const char *slabname; 385 int ordinal; 386 char slice; 387 struct cpuinfo_ia64 *c; 388 struct sn_hwperf_port_info *ptdata; 389 struct sn_hwperf_object_info *p; 390 struct sn_hwperf_object_info *obj = d; /* this object */ 391 struct sn_hwperf_object_info *objs = s->private; /* all objects */ 392 u8 shubtype; 393 u8 system_size; 394 u8 sharing_size; 395 u8 partid; 396 u8 coher; 397 u8 nasid_shift; 398 u8 region_size; 399 u16 nasid_mask; 400 int nasid_msb; 401 402 if (obj == objs) { 403 seq_printf(s, "# sn_topology version 2\n"); 404 seq_printf(s, "# objtype ordinal location partition" 405 " [attribute value [, ...]]\n"); 406 407 if (ia64_sn_get_sn_info(0, 408 &shubtype, &nasid_mask, &nasid_shift, &system_size, 409 &sharing_size, &partid, &coher, ®ion_size)) 410 BUG(); 411 for (nasid_msb=63; nasid_msb > 0; nasid_msb--) { 412 if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb)) 413 break; 414 } 415 seq_printf(s, "partition %u %s local " 416 "shubtype %s, " 417 "nasid_mask 0x%016llx, " 418 "nasid_bits %d:%d, " 419 "system_size %d, " 420 "sharing_size %d, " 421 "coherency_domain %d, " 422 "region_size %d\n", 423 424 partid, utsname()->nodename, 425 shubtype ? "shub2" : "shub1", 426 (u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift, 427 system_size, sharing_size, coher, region_size); 428 429 print_pci_topology(s); 430 } 431 432 if (SN_HWPERF_FOREIGN(obj)) { 433 /* private in another partition: not interesting */ 434 return 0; 435 } 436 437 for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) { 438 if (obj->name[i] == ' ') 439 obj->name[i] = '_'; 440 } 441 442 slabname = sn_hwperf_get_slabname(obj, objs, &ordinal); 443 seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location, 444 obj->sn_hwp_this_part ? "local" : "shared", obj->name); 445 446 if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))) 447 seq_putc(s, '\n'); 448 else { 449 cnodeid_t near_mem = -1; 450 cnodeid_t near_cpu = -1; 451 452 seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal)); 453 454 if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt, 455 ordinal, &near_mem, &near_cpu) == 0) { 456 seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d", 457 near_mem, near_cpu); 458 } 459 460 if (!SN_HWPERF_IS_IONODE(obj)) { 461 for_each_online_node(i) { 462 seq_printf(s, i ? ":%d" : ", dist %d", 463 node_distance(ordinal, i)); 464 } 465 } 466 467 seq_putc(s, '\n'); 468 469 /* 470 * CPUs on this node, if any 471 */ 472 if (!SN_HWPERF_IS_IONODE(obj)) { 473 for_each_cpu_and(i, cpu_online_mask, 474 cpumask_of_node(ordinal)) { 475 slice = 'a' + cpuid_to_slice(i); 476 c = cpu_data(i); 477 seq_printf(s, "cpu %d %s%c local" 478 " freq %luMHz, arch ia64", 479 i, obj->location, slice, 480 c->proc_freq / 1000000); 481 for_each_online_cpu(j) { 482 seq_printf(s, j ? ":%d" : ", dist %d", 483 node_distance( 484 cpu_to_node(i), 485 cpu_to_node(j))); 486 } 487 seq_putc(s, '\n'); 488 } 489 } 490 } 491 492 if (obj->ports) { 493 /* 494 * numalink ports 495 */ 496 sz = obj->ports * sizeof(struct sn_hwperf_port_info); 497 if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL) 498 return -ENOMEM; 499 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 500 SN_HWPERF_ENUM_PORTS, obj->id, sz, 501 (u64) ptdata, 0, 0, NULL); 502 if (e != SN_HWPERF_OP_OK) 503 return -EINVAL; 504 for (ordinal=0, p=objs; p != obj; p++) { 505 if (!SN_HWPERF_FOREIGN(p)) 506 ordinal += p->ports; 507 } 508 for (pt = 0; pt < obj->ports; pt++) { 509 for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) { 510 if (ptdata[pt].conn_id == p->id) { 511 break; 512 } 513 } 514 seq_printf(s, "numalink %d %s-%d", 515 ordinal+pt, obj->location, ptdata[pt].port); 516 517 if (i >= sn_hwperf_obj_cnt) { 518 /* no connection */ 519 seq_puts(s, " local endpoint disconnected" 520 ", protocol unknown\n"); 521 continue; 522 } 523 524 if (obj->sn_hwp_this_part && p->sn_hwp_this_part) 525 /* both ends local to this partition */ 526 seq_puts(s, " local"); 527 else if (SN_HWPERF_FOREIGN(p)) 528 /* both ends of the link in foreign partiton */ 529 seq_puts(s, " foreign"); 530 else 531 /* link straddles a partition */ 532 seq_puts(s, " shared"); 533 534 /* 535 * Unlikely, but strictly should query the LLP config 536 * registers because an NL4R can be configured to run 537 * NL3 protocol, even when not talking to an NL3 router. 538 * Ditto for node-node. 539 */ 540 seq_printf(s, " endpoint %s-%d, protocol %s\n", 541 p->location, ptdata[pt].conn_port, 542 (SN_HWPERF_IS_NL3ROUTER(obj) || 543 SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4"); 544 } 545 kfree(ptdata); 546 } 547 548 return 0; 549} 550 551static void *sn_topology_start(struct seq_file *s, loff_t * pos) 552{ 553 struct sn_hwperf_object_info *objs = s->private; 554 555 if (*pos < sn_hwperf_obj_cnt) 556 return (void *)(objs + *pos); 557 558 return NULL; 559} 560 561static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos) 562{ 563 ++*pos; 564 return sn_topology_start(s, pos); 565} 566 567static void sn_topology_stop(struct seq_file *m, void *v) 568{ 569 return; 570} 571 572/* 573 * /proc/sgi_sn/sn_topology, read-only using seq_file 574 */ 575static const struct seq_operations sn_topology_seq_ops = { 576 .start = sn_topology_start, 577 .next = sn_topology_next, 578 .stop = sn_topology_stop, 579 .show = sn_topology_show 580}; 581 582struct sn_hwperf_op_info { 583 u64 op; 584 struct sn_hwperf_ioctl_args *a; 585 void *p; 586 int *v0; 587 int ret; 588}; 589 590static void sn_hwperf_call_sal(void *info) 591{ 592 struct sn_hwperf_op_info *op_info = info; 593 int r; 594 595 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op, 596 op_info->a->arg, op_info->a->sz, 597 (u64) op_info->p, 0, 0, op_info->v0); 598 op_info->ret = r; 599} 600 601static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info) 602{ 603 u32 cpu; 604 u32 use_ipi; 605 int r = 0; 606 cpumask_t save_allowed; 607 608 cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32; 609 use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK; 610 op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK; 611 612 if (cpu != SN_HWPERF_ARG_ANY_CPU) { 613 if (cpu >= nr_cpu_ids || !cpu_online(cpu)) { 614 r = -EINVAL; 615 goto out; 616 } 617 } 618 619 if (cpu == SN_HWPERF_ARG_ANY_CPU) { 620 /* don't care which cpu */ 621 sn_hwperf_call_sal(op_info); 622 } else if (cpu == get_cpu()) { 623 /* already on correct cpu */ 624 sn_hwperf_call_sal(op_info); 625 put_cpu(); 626 } else { 627 put_cpu(); 628 if (use_ipi) { 629 /* use an interprocessor interrupt to call SAL */ 630 smp_call_function_single(cpu, sn_hwperf_call_sal, 631 op_info, 1); 632 } 633 else { 634 /* migrate the task before calling SAL */ 635 save_allowed = current->cpus_allowed; 636 set_cpus_allowed_ptr(current, cpumask_of(cpu)); 637 sn_hwperf_call_sal(op_info); 638 set_cpus_allowed_ptr(current, &save_allowed); 639 } 640 } 641 r = op_info->ret; 642 643out: 644 return r; 645} 646 647/* map SAL hwperf error code to system error code */ 648static int sn_hwperf_map_err(int hwperf_err) 649{ 650 int e; 651 652 switch(hwperf_err) { 653 case SN_HWPERF_OP_OK: 654 e = 0; 655 break; 656 657 case SN_HWPERF_OP_NOMEM: 658 e = -ENOMEM; 659 break; 660 661 case SN_HWPERF_OP_NO_PERM: 662 e = -EPERM; 663 break; 664 665 case SN_HWPERF_OP_IO_ERROR: 666 e = -EIO; 667 break; 668 669 case SN_HWPERF_OP_BUSY: 670 e = -EBUSY; 671 break; 672 673 case SN_HWPERF_OP_RECONFIGURE: 674 e = -EAGAIN; 675 break; 676 677 case SN_HWPERF_OP_INVAL: 678 default: 679 e = -EINVAL; 680 break; 681 } 682 683 return e; 684} 685 686/* 687 * ioctl for "sn_hwperf" misc device 688 */ 689static long sn_hwperf_ioctl(struct file *fp, u32 op, unsigned long arg) 690{ 691 struct sn_hwperf_ioctl_args a; 692 struct cpuinfo_ia64 *cdata; 693 struct sn_hwperf_object_info *objs; 694 struct sn_hwperf_object_info *cpuobj; 695 struct sn_hwperf_op_info op_info; 696 void *p = NULL; 697 int nobj; 698 char slice; 699 int node; 700 int r; 701 int v0; 702 int i; 703 int j; 704 705 /* only user requests are allowed here */ 706 if ((op & SN_HWPERF_OP_MASK) < 10) { 707 r = -EINVAL; 708 goto error; 709 } 710 r = copy_from_user(&a, (const void __user *)arg, 711 sizeof(struct sn_hwperf_ioctl_args)); 712 if (r != 0) { 713 r = -EFAULT; 714 goto error; 715 } 716 717 /* 718 * Allocate memory to hold a kernel copy of the user buffer. The 719 * buffer contents are either copied in or out (or both) of user 720 * space depending on the flags encoded in the requested operation. 721 */ 722 if (a.ptr) { 723 p = vmalloc(a.sz); 724 if (!p) { 725 r = -ENOMEM; 726 goto error; 727 } 728 } 729 730 if (op & SN_HWPERF_OP_MEM_COPYIN) { 731 r = copy_from_user(p, (const void __user *)a.ptr, a.sz); 732 if (r != 0) { 733 r = -EFAULT; 734 goto error; 735 } 736 } 737 738 switch (op) { 739 case SN_HWPERF_GET_CPU_INFO: 740 if (a.sz == sizeof(u64)) { 741 /* special case to get size needed */ 742 *(u64 *) p = (u64) num_online_cpus() * 743 sizeof(struct sn_hwperf_object_info); 744 } else 745 if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) { 746 r = -ENOMEM; 747 goto error; 748 } else 749 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { 750 int cpuobj_index = 0; 751 752 memset(p, 0, a.sz); 753 for (i = 0; i < nobj; i++) { 754 if (!SN_HWPERF_IS_NODE(objs + i)) 755 continue; 756 node = sn_hwperf_obj_to_cnode(objs + i); 757 for_each_online_cpu(j) { 758 if (node != cpu_to_node(j)) 759 continue; 760 cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++; 761 slice = 'a' + cpuid_to_slice(j); 762 cdata = cpu_data(j); 763 cpuobj->id = j; 764 snprintf(cpuobj->name, 765 sizeof(cpuobj->name), 766 "CPU %luMHz %s", 767 cdata->proc_freq / 1000000, 768 cdata->vendor); 769 snprintf(cpuobj->location, 770 sizeof(cpuobj->location), 771 "%s%c", objs[i].location, 772 slice); 773 } 774 } 775 776 vfree(objs); 777 } 778 break; 779 780 case SN_HWPERF_GET_NODE_NASID: 781 if (a.sz != sizeof(u64) || 782 (node = a.arg) < 0 || !cnode_possible(node)) { 783 r = -EINVAL; 784 goto error; 785 } 786 *(u64 *)p = (u64)cnodeid_to_nasid(node); 787 break; 788 789 case SN_HWPERF_GET_OBJ_NODE: 790 i = a.arg; 791 if (a.sz != sizeof(u64) || i < 0) { 792 r = -EINVAL; 793 goto error; 794 } 795 if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { 796 if (i >= nobj) { 797 r = -EINVAL; 798 vfree(objs); 799 goto error; 800 } 801 if (objs[i].id != a.arg) { 802 for (i = 0; i < nobj; i++) { 803 if (objs[i].id == a.arg) 804 break; 805 } 806 } 807 if (i == nobj) { 808 r = -EINVAL; 809 vfree(objs); 810 goto error; 811 } 812 813 if (!SN_HWPERF_IS_NODE(objs + i) && 814 !SN_HWPERF_IS_IONODE(objs + i)) { 815 r = -ENOENT; 816 vfree(objs); 817 goto error; 818 } 819 820 *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i); 821 vfree(objs); 822 } 823 break; 824 825 case SN_HWPERF_GET_MMRS: 826 case SN_HWPERF_SET_MMRS: 827 case SN_HWPERF_OBJECT_DISTANCE: 828 op_info.p = p; 829 op_info.a = &a; 830 op_info.v0 = &v0; 831 op_info.op = op; 832 r = sn_hwperf_op_cpu(&op_info); 833 if (r) { 834 r = sn_hwperf_map_err(r); 835 a.v0 = v0; 836 goto error; 837 } 838 break; 839 840 default: 841 /* all other ops are a direct SAL call */ 842 r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op, 843 a.arg, a.sz, (u64) p, 0, 0, &v0); 844 if (r) { 845 r = sn_hwperf_map_err(r); 846 goto error; 847 } 848 a.v0 = v0; 849 break; 850 } 851 852 if (op & SN_HWPERF_OP_MEM_COPYOUT) { 853 r = copy_to_user((void __user *)a.ptr, p, a.sz); 854 if (r != 0) { 855 r = -EFAULT; 856 goto error; 857 } 858 } 859 860error: 861 vfree(p); 862 863 return r; 864} 865 866static const struct file_operations sn_hwperf_fops = { 867 .unlocked_ioctl = sn_hwperf_ioctl, 868 .llseek = noop_llseek, 869}; 870 871static struct miscdevice sn_hwperf_dev = { 872 MISC_DYNAMIC_MINOR, 873 "sn_hwperf", 874 &sn_hwperf_fops 875}; 876 877static int sn_hwperf_init(void) 878{ 879 u64 v; 880 int salr; 881 int e = 0; 882 883 /* single threaded, once-only initialization */ 884 mutex_lock(&sn_hwperf_init_mutex); 885 886 if (sn_hwperf_salheap) { 887 mutex_unlock(&sn_hwperf_init_mutex); 888 return e; 889 } 890 891 /* 892 * The PROM code needs a fixed reference node. For convenience the 893 * same node as the console I/O is used. 894 */ 895 sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid(); 896 897 /* 898 * Request the needed size and install the PROM scratch area. 899 * The PROM keeps various tracking bits in this memory area. 900 */ 901 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 902 (u64) SN_HWPERF_GET_HEAPSIZE, 0, 903 (u64) sizeof(u64), (u64) &v, 0, 0, NULL); 904 if (salr != SN_HWPERF_OP_OK) { 905 e = -EINVAL; 906 goto out; 907 } 908 909 if ((sn_hwperf_salheap = vmalloc(v)) == NULL) { 910 e = -ENOMEM; 911 goto out; 912 } 913 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 914 SN_HWPERF_INSTALL_HEAP, 0, v, 915 (u64) sn_hwperf_salheap, 0, 0, NULL); 916 if (salr != SN_HWPERF_OP_OK) { 917 e = -EINVAL; 918 goto out; 919 } 920 921 salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, 922 SN_HWPERF_OBJECT_COUNT, 0, 923 sizeof(u64), (u64) &v, 0, 0, NULL); 924 if (salr != SN_HWPERF_OP_OK) { 925 e = -EINVAL; 926 goto out; 927 } 928 sn_hwperf_obj_cnt = (int)v; 929 930out: 931 if (e < 0 && sn_hwperf_salheap) { 932 vfree(sn_hwperf_salheap); 933 sn_hwperf_salheap = NULL; 934 sn_hwperf_obj_cnt = 0; 935 } 936 mutex_unlock(&sn_hwperf_init_mutex); 937 return e; 938} 939 940int sn_topology_open(struct inode *inode, struct file *file) 941{ 942 int e; 943 struct seq_file *seq; 944 struct sn_hwperf_object_info *objbuf; 945 int nobj; 946 947 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) { 948 e = seq_open(file, &sn_topology_seq_ops); 949 seq = file->private_data; 950 seq->private = objbuf; 951 } 952 953 return e; 954} 955 956int sn_topology_release(struct inode *inode, struct file *file) 957{ 958 struct seq_file *seq = file->private_data; 959 960 vfree(seq->private); 961 return seq_release(inode, file); 962} 963 964int sn_hwperf_get_nearest_node(cnodeid_t node, 965 cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node) 966{ 967 int e; 968 int nobj; 969 struct sn_hwperf_object_info *objbuf; 970 971 if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) { 972 e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj, 973 node, near_mem_node, near_cpu_node); 974 vfree(objbuf); 975 } 976 977 return e; 978} 979 980static int sn_hwperf_misc_register_init(void) 981{ 982 int e; 983 984 if (!ia64_platform_is("sn2")) 985 return 0; 986 987 sn_hwperf_init(); 988 989 /* 990 * Register a dynamic misc device for hwperf ioctls. Platforms 991 * supporting hotplug will create /dev/sn_hwperf, else user 992 * can to look up the minor number in /proc/misc. 993 */ 994 if ((e = misc_register(&sn_hwperf_dev)) != 0) { 995 printk(KERN_ERR "sn_hwperf_misc_register_init: failed to " 996 "register misc device for \"%s\"\n", sn_hwperf_dev.name); 997 } 998 999 return e; 1000} 1001 1002device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */ 1003EXPORT_SYMBOL(sn_hwperf_get_nearest_node); 1004