1 /* 2 * Hypervisor supplied "24x7" performance counter support 3 * 4 * Author: Cody P Schafer <cody@linux.vnet.ibm.com> 5 * Copyright 2014 IBM Corporation. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #define pr_fmt(fmt) "hv-24x7: " fmt 14 15 #include <linux/perf_event.h> 16 #include <linux/rbtree.h> 17 #include <linux/module.h> 18 #include <linux/slab.h> 19 #include <linux/vmalloc.h> 20 21 #include <asm/firmware.h> 22 #include <asm/hvcall.h> 23 #include <asm/io.h> 24 #include <linux/byteorder/generic.h> 25 26 #include "hv-24x7.h" 27 #include "hv-24x7-catalog.h" 28 #include "hv-common.h" 29 30 static const char *event_domain_suffix(unsigned domain) 31 { 32 switch (domain) { 33 #define DOMAIN(n, v, x, c) \ 34 case HV_PERF_DOMAIN_##n: \ 35 return "__" #n; 36 #include "hv-24x7-domains.h" 37 #undef DOMAIN 38 default: 39 WARN(1, "unknown domain %d\n", domain); 40 return "__UNKNOWN_DOMAIN_SUFFIX"; 41 } 42 } 43 44 static bool domain_is_valid(unsigned domain) 45 { 46 switch (domain) { 47 #define DOMAIN(n, v, x, c) \ 48 case HV_PERF_DOMAIN_##n: \ 49 /* fall through */ 50 #include "hv-24x7-domains.h" 51 #undef DOMAIN 52 return true; 53 default: 54 return false; 55 } 56 } 57 58 static bool is_physical_domain(unsigned domain) 59 { 60 switch (domain) { 61 #define DOMAIN(n, v, x, c) \ 62 case HV_PERF_DOMAIN_##n: \ 63 return c; 64 #include "hv-24x7-domains.h" 65 #undef DOMAIN 66 default: 67 return false; 68 } 69 } 70 71 static bool catalog_entry_domain_is_valid(unsigned domain) 72 { 73 return is_physical_domain(domain); 74 } 75 76 /* 77 * TODO: Merging events: 78 * - Think of the hcall as an interface to a 4d array of counters: 79 * - x = domains 80 * - y = indexes in the domain (core, chip, vcpu, node, etc) 81 * - z = offset into the counter space 82 * - w = lpars (guest vms, "logical partitions") 83 * - A single request is: x,y,y_last,z,z_last,w,w_last 84 * - this means we can retrieve a rectangle of counters in y,z for a single x. 85 * 86 * - Things to consider (ignoring w): 87 * - input cost_per_request = 16 88 * - output cost_per_result(ys,zs) = 8 + 8 * ys + ys * zs 89 * - limited number of requests per hcall (must fit into 4K bytes) 90 * - 4k = 16 [buffer header] - 16 [request size] * request_count 91 * - 255 requests per hcall 92 * - sometimes it will be more efficient to read extra data and discard 93 */ 94 95 /* 96 * Example usage: 97 * perf stat -e 'hv_24x7/domain=2,offset=8,vcpu=0,lpar=0xffffffff/' 98 */ 99 100 /* u3 0-6, one of HV_24X7_PERF_DOMAIN */ 101 EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3); 102 /* u16 */ 103 EVENT_DEFINE_RANGE_FORMAT(core, config, 16, 31); 104 EVENT_DEFINE_RANGE_FORMAT(vcpu, config, 16, 31); 105 /* u32, see "data_offset" */ 106 EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63); 107 /* u16 */ 108 EVENT_DEFINE_RANGE_FORMAT(lpar, config1, 0, 15); 109 110 EVENT_DEFINE_RANGE(reserved1, config, 4, 15); 111 EVENT_DEFINE_RANGE(reserved2, config1, 16, 63); 112 EVENT_DEFINE_RANGE(reserved3, config2, 0, 63); 113 114 static struct attribute *format_attrs[] = { 115 &format_attr_domain.attr, 116 &format_attr_offset.attr, 117 &format_attr_core.attr, 118 &format_attr_vcpu.attr, 119 &format_attr_lpar.attr, 120 NULL, 121 }; 122 123 static struct attribute_group format_group = { 124 .name = "format", 125 .attrs = format_attrs, 126 }; 127 128 static struct attribute_group event_group = { 129 .name = "events", 130 /* .attrs is set in init */ 131 }; 132 133 static struct attribute_group event_desc_group = { 134 .name = "event_descs", 135 /* .attrs is set in init */ 136 }; 137 138 static struct attribute_group event_long_desc_group = { 139 .name = "event_long_descs", 140 /* .attrs is set in init */ 141 }; 142 143 static struct kmem_cache *hv_page_cache; 144 145 DEFINE_PER_CPU(int, hv_24x7_txn_flags); 146 DEFINE_PER_CPU(int, hv_24x7_txn_err); 147 148 struct hv_24x7_hw { 149 struct perf_event *events[255]; 150 }; 151 152 DEFINE_PER_CPU(struct hv_24x7_hw, hv_24x7_hw); 153 154 /* 155 * request_buffer and result_buffer are not required to be 4k aligned, 156 * but are not allowed to cross any 4k boundary. Aligning them to 4k is 157 * the simplest way to ensure that. 158 */ 159 #define H24x7_DATA_BUFFER_SIZE 4096 160 DEFINE_PER_CPU(char, hv_24x7_reqb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096); 161 DEFINE_PER_CPU(char, hv_24x7_resb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096); 162 163 static char *event_name(struct hv_24x7_event_data *ev, int *len) 164 { 165 *len = be16_to_cpu(ev->event_name_len) - 2; 166 return (char *)ev->remainder; 167 } 168 169 static char *event_desc(struct hv_24x7_event_data *ev, int *len) 170 { 171 unsigned nl = be16_to_cpu(ev->event_name_len); 172 __be16 *desc_len = (__be16 *)(ev->remainder + nl - 2); 173 174 *len = be16_to_cpu(*desc_len) - 2; 175 return (char *)ev->remainder + nl; 176 } 177 178 static char *event_long_desc(struct hv_24x7_event_data *ev, int *len) 179 { 180 unsigned nl = be16_to_cpu(ev->event_name_len); 181 __be16 *desc_len_ = (__be16 *)(ev->remainder + nl - 2); 182 unsigned desc_len = be16_to_cpu(*desc_len_); 183 __be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2); 184 185 *len = be16_to_cpu(*long_desc_len) - 2; 186 return (char *)ev->remainder + nl + desc_len; 187 } 188 189 static bool event_fixed_portion_is_within(struct hv_24x7_event_data *ev, 190 void *end) 191 { 192 void *start = ev; 193 194 return (start + offsetof(struct hv_24x7_event_data, remainder)) < end; 195 } 196 197 /* 198 * Things we don't check: 199 * - padding for desc, name, and long/detailed desc is required to be '\0' 200 * bytes. 201 * 202 * Return NULL if we pass end, 203 * Otherwise return the address of the byte just following the event. 204 */ 205 static void *event_end(struct hv_24x7_event_data *ev, void *end) 206 { 207 void *start = ev; 208 __be16 *dl_, *ldl_; 209 unsigned dl, ldl; 210 unsigned nl = be16_to_cpu(ev->event_name_len); 211 212 if (nl < 2) { 213 pr_debug("%s: name length too short: %d", __func__, nl); 214 return NULL; 215 } 216 217 if (start + nl > end) { 218 pr_debug("%s: start=%p + nl=%u > end=%p", 219 __func__, start, nl, end); 220 return NULL; 221 } 222 223 dl_ = (__be16 *)(ev->remainder + nl - 2); 224 if (!IS_ALIGNED((uintptr_t)dl_, 2)) 225 pr_warn("desc len not aligned %p", dl_); 226 dl = be16_to_cpu(*dl_); 227 if (dl < 2) { 228 pr_debug("%s: desc len too short: %d", __func__, dl); 229 return NULL; 230 } 231 232 if (start + nl + dl > end) { 233 pr_debug("%s: (start=%p + nl=%u + dl=%u)=%p > end=%p", 234 __func__, start, nl, dl, start + nl + dl, end); 235 return NULL; 236 } 237 238 ldl_ = (__be16 *)(ev->remainder + nl + dl - 2); 239 if (!IS_ALIGNED((uintptr_t)ldl_, 2)) 240 pr_warn("long desc len not aligned %p", ldl_); 241 ldl = be16_to_cpu(*ldl_); 242 if (ldl < 2) { 243 pr_debug("%s: long desc len too short (ldl=%u)", 244 __func__, ldl); 245 return NULL; 246 } 247 248 if (start + nl + dl + ldl > end) { 249 pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p", 250 __func__, start, nl, dl, ldl, end); 251 return NULL; 252 } 253 254 return start + nl + dl + ldl; 255 } 256 257 static unsigned long h_get_24x7_catalog_page_(unsigned long phys_4096, 258 unsigned long version, 259 unsigned long index) 260 { 261 pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)", 262 phys_4096, version, index); 263 264 WARN_ON(!IS_ALIGNED(phys_4096, 4096)); 265 266 return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE, 267 phys_4096, version, index); 268 } 269 270 static unsigned long h_get_24x7_catalog_page(char page[], 271 u64 version, u32 index) 272 { 273 return h_get_24x7_catalog_page_(virt_to_phys(page), 274 version, index); 275 } 276 277 static unsigned core_domains[] = { 278 HV_PERF_DOMAIN_PHYS_CORE, 279 HV_PERF_DOMAIN_VCPU_HOME_CORE, 280 HV_PERF_DOMAIN_VCPU_HOME_CHIP, 281 HV_PERF_DOMAIN_VCPU_HOME_NODE, 282 HV_PERF_DOMAIN_VCPU_REMOTE_NODE, 283 }; 284 /* chip event data always yeilds a single event, core yeilds multiple */ 285 #define MAX_EVENTS_PER_EVENT_DATA ARRAY_SIZE(core_domains) 286 287 static char *event_fmt(struct hv_24x7_event_data *event, unsigned domain) 288 { 289 const char *sindex; 290 const char *lpar; 291 292 if (is_physical_domain(domain)) { 293 lpar = "0x0"; 294 sindex = "core"; 295 } else { 296 lpar = "?"; 297 sindex = "vcpu"; 298 } 299 300 return kasprintf(GFP_KERNEL, 301 "domain=0x%x,offset=0x%x,%s=?,lpar=%s", 302 domain, 303 be16_to_cpu(event->event_counter_offs) + 304 be16_to_cpu(event->event_group_record_offs), 305 sindex, 306 lpar); 307 } 308 309 /* Avoid trusting fw to NUL terminate strings */ 310 static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp) 311 { 312 return kasprintf(gfp, "%.*s", max_len, maybe_str); 313 } 314 315 static ssize_t device_show_string(struct device *dev, 316 struct device_attribute *attr, char *buf) 317 { 318 struct dev_ext_attribute *d; 319 320 d = container_of(attr, struct dev_ext_attribute, attr); 321 322 return sprintf(buf, "%s\n", (char *)d->var); 323 } 324 325 static struct attribute *device_str_attr_create_(char *name, char *str) 326 { 327 struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL); 328 329 if (!attr) 330 return NULL; 331 332 sysfs_attr_init(&attr->attr.attr); 333 334 attr->var = str; 335 attr->attr.attr.name = name; 336 attr->attr.attr.mode = 0444; 337 attr->attr.show = device_show_string; 338 339 return &attr->attr.attr; 340 } 341 342 static struct attribute *device_str_attr_create(char *name, int name_max, 343 int name_nonce, 344 char *str, size_t str_max) 345 { 346 char *n; 347 char *s = memdup_to_str(str, str_max, GFP_KERNEL); 348 struct attribute *a; 349 350 if (!s) 351 return NULL; 352 353 if (!name_nonce) 354 n = kasprintf(GFP_KERNEL, "%.*s", name_max, name); 355 else 356 n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name, 357 name_nonce); 358 if (!n) 359 goto out_s; 360 361 a = device_str_attr_create_(n, s); 362 if (!a) 363 goto out_n; 364 365 return a; 366 out_n: 367 kfree(n); 368 out_s: 369 kfree(s); 370 return NULL; 371 } 372 373 static void device_str_attr_destroy(struct attribute *attr) 374 { 375 struct dev_ext_attribute *d; 376 377 d = container_of(attr, struct dev_ext_attribute, attr.attr); 378 kfree(d->var); 379 kfree(d->attr.attr.name); 380 kfree(d); 381 } 382 383 static struct attribute *event_to_attr(unsigned ix, 384 struct hv_24x7_event_data *event, 385 unsigned domain, 386 int nonce) 387 { 388 int event_name_len; 389 char *ev_name, *a_ev_name, *val; 390 const char *ev_suffix; 391 struct attribute *attr; 392 393 if (!domain_is_valid(domain)) { 394 pr_warn("catalog event %u has invalid domain %u\n", 395 ix, domain); 396 return NULL; 397 } 398 399 val = event_fmt(event, domain); 400 if (!val) 401 return NULL; 402 403 ev_suffix = event_domain_suffix(domain); 404 ev_name = event_name(event, &event_name_len); 405 if (!nonce) 406 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s", 407 (int)event_name_len, ev_name, ev_suffix); 408 else 409 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s__%d", 410 (int)event_name_len, ev_name, ev_suffix, nonce); 411 412 if (!a_ev_name) 413 goto out_val; 414 415 attr = device_str_attr_create_(a_ev_name, val); 416 if (!attr) 417 goto out_name; 418 419 return attr; 420 out_name: 421 kfree(a_ev_name); 422 out_val: 423 kfree(val); 424 return NULL; 425 } 426 427 static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event, 428 int nonce) 429 { 430 int nl, dl; 431 char *name = event_name(event, &nl); 432 char *desc = event_desc(event, &dl); 433 434 /* If there isn't a description, don't create the sysfs file */ 435 if (!dl) 436 return NULL; 437 438 return device_str_attr_create(name, nl, nonce, desc, dl); 439 } 440 441 static struct attribute * 442 event_to_long_desc_attr(struct hv_24x7_event_data *event, int nonce) 443 { 444 int nl, dl; 445 char *name = event_name(event, &nl); 446 char *desc = event_long_desc(event, &dl); 447 448 /* If there isn't a description, don't create the sysfs file */ 449 if (!dl) 450 return NULL; 451 452 return device_str_attr_create(name, nl, nonce, desc, dl); 453 } 454 455 static ssize_t event_data_to_attrs(unsigned ix, struct attribute **attrs, 456 struct hv_24x7_event_data *event, int nonce) 457 { 458 unsigned i; 459 460 switch (event->domain) { 461 case HV_PERF_DOMAIN_PHYS_CHIP: 462 *attrs = event_to_attr(ix, event, event->domain, nonce); 463 return 1; 464 case HV_PERF_DOMAIN_PHYS_CORE: 465 for (i = 0; i < ARRAY_SIZE(core_domains); i++) { 466 attrs[i] = event_to_attr(ix, event, core_domains[i], 467 nonce); 468 if (!attrs[i]) { 469 pr_warn("catalog event %u: individual attr %u " 470 "creation failure\n", ix, i); 471 for (; i; i--) 472 device_str_attr_destroy(attrs[i - 1]); 473 return -1; 474 } 475 } 476 return i; 477 default: 478 pr_warn("catalog event %u: domain %u is not allowed in the " 479 "catalog\n", ix, event->domain); 480 return -1; 481 } 482 } 483 484 static size_t event_to_attr_ct(struct hv_24x7_event_data *event) 485 { 486 switch (event->domain) { 487 case HV_PERF_DOMAIN_PHYS_CHIP: 488 return 1; 489 case HV_PERF_DOMAIN_PHYS_CORE: 490 return ARRAY_SIZE(core_domains); 491 default: 492 return 0; 493 } 494 } 495 496 /* */ 497 struct event_uniq { 498 struct rb_node node; 499 const char *name; 500 int nl; 501 unsigned ct; 502 unsigned domain; 503 }; 504 505 static int memord(const void *d1, size_t s1, const void *d2, size_t s2) 506 { 507 if (s1 < s2) 508 return 1; 509 if (s2 > s1) 510 return -1; 511 512 return memcmp(d1, d2, s1); 513 } 514 515 static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2, 516 size_t s2, unsigned d2) 517 { 518 int r = memord(v1, s1, v2, s2); 519 520 if (r) 521 return r; 522 if (d1 > d2) 523 return 1; 524 if (d2 > d1) 525 return -1; 526 return 0; 527 } 528 529 static int event_uniq_add(struct rb_root *root, const char *name, int nl, 530 unsigned domain) 531 { 532 struct rb_node **new = &(root->rb_node), *parent = NULL; 533 struct event_uniq *data; 534 535 /* Figure out where to put new node */ 536 while (*new) { 537 struct event_uniq *it; 538 int result; 539 540 it = container_of(*new, struct event_uniq, node); 541 result = ev_uniq_ord(name, nl, domain, it->name, it->nl, 542 it->domain); 543 544 parent = *new; 545 if (result < 0) 546 new = &((*new)->rb_left); 547 else if (result > 0) 548 new = &((*new)->rb_right); 549 else { 550 it->ct++; 551 pr_info("found a duplicate event %.*s, ct=%u\n", nl, 552 name, it->ct); 553 return it->ct; 554 } 555 } 556 557 data = kmalloc(sizeof(*data), GFP_KERNEL); 558 if (!data) 559 return -ENOMEM; 560 561 *data = (struct event_uniq) { 562 .name = name, 563 .nl = nl, 564 .ct = 0, 565 .domain = domain, 566 }; 567 568 /* Add new node and rebalance tree. */ 569 rb_link_node(&data->node, parent, new); 570 rb_insert_color(&data->node, root); 571 572 /* data->ct */ 573 return 0; 574 } 575 576 static void event_uniq_destroy(struct rb_root *root) 577 { 578 /* 579 * the strings we point to are in the giant block of memory filled by 580 * the catalog, and are freed separately. 581 */ 582 struct event_uniq *pos, *n; 583 584 rbtree_postorder_for_each_entry_safe(pos, n, root, node) 585 kfree(pos); 586 } 587 588 589 /* 590 * ensure the event structure's sizes are self consistent and don't cause us to 591 * read outside of the event 592 * 593 * On success, return the event length in bytes. 594 * Otherwise, return -1 (and print as appropriate). 595 */ 596 static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event, 597 size_t event_idx, 598 size_t event_data_bytes, 599 size_t event_entry_count, 600 size_t offset, void *end) 601 { 602 ssize_t ev_len; 603 void *ev_end, *calc_ev_end; 604 605 if (offset >= event_data_bytes) 606 return -1; 607 608 if (event_idx >= event_entry_count) { 609 pr_devel("catalog event data has %zu bytes of padding after last event\n", 610 event_data_bytes - offset); 611 return -1; 612 } 613 614 if (!event_fixed_portion_is_within(event, end)) { 615 pr_warn("event %zu fixed portion is not within range\n", 616 event_idx); 617 return -1; 618 } 619 620 ev_len = be16_to_cpu(event->length); 621 622 if (ev_len % 16) 623 pr_info("event %zu has length %zu not divisible by 16: event=%pK\n", 624 event_idx, ev_len, event); 625 626 ev_end = (__u8 *)event + ev_len; 627 if (ev_end > end) { 628 pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n", 629 event_idx, ev_len, ev_end, end, 630 offset); 631 return -1; 632 } 633 634 calc_ev_end = event_end(event, end); 635 if (!calc_ev_end) { 636 pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n", 637 event_idx, event_data_bytes, event, end, 638 offset); 639 return -1; 640 } 641 642 if (calc_ev_end > ev_end) { 643 pr_warn("event %zu exceeds it's own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n", 644 event_idx, event, ev_end, offset, calc_ev_end); 645 return -1; 646 } 647 648 return ev_len; 649 } 650 651 #define MAX_4K (SIZE_MAX / 4096) 652 653 static int create_events_from_catalog(struct attribute ***events_, 654 struct attribute ***event_descs_, 655 struct attribute ***event_long_descs_) 656 { 657 unsigned long hret; 658 size_t catalog_len, catalog_page_len, event_entry_count, 659 event_data_len, event_data_offs, 660 event_data_bytes, junk_events, event_idx, event_attr_ct, i, 661 attr_max, event_idx_last, desc_ct, long_desc_ct; 662 ssize_t ct, ev_len; 663 uint32_t catalog_version_num; 664 struct attribute **events, **event_descs, **event_long_descs; 665 struct hv_24x7_catalog_page_0 *page_0 = 666 kmem_cache_alloc(hv_page_cache, GFP_KERNEL); 667 void *page = page_0; 668 void *event_data, *end; 669 struct hv_24x7_event_data *event; 670 struct rb_root ev_uniq = RB_ROOT; 671 int ret = 0; 672 673 if (!page) { 674 ret = -ENOMEM; 675 goto e_out; 676 } 677 678 hret = h_get_24x7_catalog_page(page, 0, 0); 679 if (hret) { 680 ret = -EIO; 681 goto e_free; 682 } 683 684 catalog_version_num = be64_to_cpu(page_0->version); 685 catalog_page_len = be32_to_cpu(page_0->length); 686 687 if (MAX_4K < catalog_page_len) { 688 pr_err("invalid page count: %zu\n", catalog_page_len); 689 ret = -EIO; 690 goto e_free; 691 } 692 693 catalog_len = catalog_page_len * 4096; 694 695 event_entry_count = be16_to_cpu(page_0->event_entry_count); 696 event_data_offs = be16_to_cpu(page_0->event_data_offs); 697 event_data_len = be16_to_cpu(page_0->event_data_len); 698 699 pr_devel("cv %zu cl %zu eec %zu edo %zu edl %zu\n", 700 (size_t)catalog_version_num, catalog_len, 701 event_entry_count, event_data_offs, event_data_len); 702 703 if ((MAX_4K < event_data_len) 704 || (MAX_4K < event_data_offs) 705 || (MAX_4K - event_data_offs < event_data_len)) { 706 pr_err("invalid event data offs %zu and/or len %zu\n", 707 event_data_offs, event_data_len); 708 ret = -EIO; 709 goto e_free; 710 } 711 712 if ((event_data_offs + event_data_len) > catalog_page_len) { 713 pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n", 714 event_data_offs, 715 event_data_offs + event_data_len, 716 catalog_page_len); 717 ret = -EIO; 718 goto e_free; 719 } 720 721 if (SIZE_MAX / MAX_EVENTS_PER_EVENT_DATA - 1 < event_entry_count) { 722 pr_err("event_entry_count %zu is invalid\n", 723 event_entry_count); 724 ret = -EIO; 725 goto e_free; 726 } 727 728 event_data_bytes = event_data_len * 4096; 729 730 /* 731 * event data can span several pages, events can cross between these 732 * pages. Use vmalloc to make this easier. 733 */ 734 event_data = vmalloc(event_data_bytes); 735 if (!event_data) { 736 pr_err("could not allocate event data\n"); 737 ret = -ENOMEM; 738 goto e_free; 739 } 740 741 end = event_data + event_data_bytes; 742 743 /* 744 * using vmalloc_to_phys() like this only works if PAGE_SIZE is 745 * divisible by 4096 746 */ 747 BUILD_BUG_ON(PAGE_SIZE % 4096); 748 749 for (i = 0; i < event_data_len; i++) { 750 hret = h_get_24x7_catalog_page_( 751 vmalloc_to_phys(event_data + i * 4096), 752 catalog_version_num, 753 i + event_data_offs); 754 if (hret) { 755 pr_err("failed to get event data in page %zu\n", 756 i + event_data_offs); 757 ret = -EIO; 758 goto e_event_data; 759 } 760 } 761 762 /* 763 * scan the catalog to determine the number of attributes we need, and 764 * verify it at the same time. 765 */ 766 for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0; 767 ; 768 event_idx++, event = (void *)event + ev_len) { 769 size_t offset = (void *)event - (void *)event_data; 770 char *name; 771 int nl; 772 773 ev_len = catalog_event_len_validate(event, event_idx, 774 event_data_bytes, 775 event_entry_count, 776 offset, end); 777 if (ev_len < 0) 778 break; 779 780 name = event_name(event, &nl); 781 782 if (event->event_group_record_len == 0) { 783 pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n", 784 event_idx, nl, name); 785 junk_events++; 786 continue; 787 } 788 789 if (!catalog_entry_domain_is_valid(event->domain)) { 790 pr_info("event %zu (%.*s) has invalid domain %d\n", 791 event_idx, nl, name, event->domain); 792 junk_events++; 793 continue; 794 } 795 796 attr_max += event_to_attr_ct(event); 797 } 798 799 event_idx_last = event_idx; 800 if (event_idx_last != event_entry_count) 801 pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n", 802 event_idx_last, event_entry_count, junk_events); 803 804 events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL); 805 if (!events) { 806 ret = -ENOMEM; 807 goto e_event_data; 808 } 809 810 event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs), 811 GFP_KERNEL); 812 if (!event_descs) { 813 ret = -ENOMEM; 814 goto e_event_attrs; 815 } 816 817 event_long_descs = kmalloc_array(event_idx + 1, 818 sizeof(*event_long_descs), GFP_KERNEL); 819 if (!event_long_descs) { 820 ret = -ENOMEM; 821 goto e_event_descs; 822 } 823 824 /* Iterate over the catalog filling in the attribute vector */ 825 for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0, 826 event = event_data, event_idx = 0; 827 event_idx < event_idx_last; 828 event_idx++, ev_len = be16_to_cpu(event->length), 829 event = (void *)event + ev_len) { 830 char *name; 831 int nl; 832 int nonce; 833 /* 834 * these are the only "bad" events that are intermixed and that 835 * we can ignore without issue. make sure to skip them here 836 */ 837 if (event->event_group_record_len == 0) 838 continue; 839 if (!catalog_entry_domain_is_valid(event->domain)) 840 continue; 841 842 name = event_name(event, &nl); 843 nonce = event_uniq_add(&ev_uniq, name, nl, event->domain); 844 ct = event_data_to_attrs(event_idx, events + event_attr_ct, 845 event, nonce); 846 if (ct <= 0) { 847 pr_warn("event %zu (%.*s) creation failure, skipping\n", 848 event_idx, nl, name); 849 junk_events++; 850 } else { 851 event_attr_ct += ct; 852 event_descs[desc_ct] = event_to_desc_attr(event, nonce); 853 if (event_descs[desc_ct]) 854 desc_ct++; 855 event_long_descs[long_desc_ct] = 856 event_to_long_desc_attr(event, nonce); 857 if (event_long_descs[long_desc_ct]) 858 long_desc_ct++; 859 } 860 } 861 862 pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n", 863 event_idx, event_attr_ct, junk_events, desc_ct); 864 865 events[event_attr_ct] = NULL; 866 event_descs[desc_ct] = NULL; 867 event_long_descs[long_desc_ct] = NULL; 868 869 event_uniq_destroy(&ev_uniq); 870 vfree(event_data); 871 kmem_cache_free(hv_page_cache, page); 872 873 *events_ = events; 874 *event_descs_ = event_descs; 875 *event_long_descs_ = event_long_descs; 876 return 0; 877 878 e_event_descs: 879 kfree(event_descs); 880 e_event_attrs: 881 kfree(events); 882 e_event_data: 883 vfree(event_data); 884 e_free: 885 kmem_cache_free(hv_page_cache, page); 886 e_out: 887 *events_ = NULL; 888 *event_descs_ = NULL; 889 *event_long_descs_ = NULL; 890 return ret; 891 } 892 893 static ssize_t catalog_read(struct file *filp, struct kobject *kobj, 894 struct bin_attribute *bin_attr, char *buf, 895 loff_t offset, size_t count) 896 { 897 unsigned long hret; 898 ssize_t ret = 0; 899 size_t catalog_len = 0, catalog_page_len = 0; 900 loff_t page_offset = 0; 901 loff_t offset_in_page; 902 size_t copy_len; 903 uint64_t catalog_version_num = 0; 904 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); 905 struct hv_24x7_catalog_page_0 *page_0 = page; 906 907 if (!page) 908 return -ENOMEM; 909 910 hret = h_get_24x7_catalog_page(page, 0, 0); 911 if (hret) { 912 ret = -EIO; 913 goto e_free; 914 } 915 916 catalog_version_num = be64_to_cpu(page_0->version); 917 catalog_page_len = be32_to_cpu(page_0->length); 918 catalog_len = catalog_page_len * 4096; 919 920 page_offset = offset / 4096; 921 offset_in_page = offset % 4096; 922 923 if (page_offset >= catalog_page_len) 924 goto e_free; 925 926 if (page_offset != 0) { 927 hret = h_get_24x7_catalog_page(page, catalog_version_num, 928 page_offset); 929 if (hret) { 930 ret = -EIO; 931 goto e_free; 932 } 933 } 934 935 copy_len = 4096 - offset_in_page; 936 if (copy_len > count) 937 copy_len = count; 938 939 memcpy(buf, page+offset_in_page, copy_len); 940 ret = copy_len; 941 942 e_free: 943 if (hret) 944 pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:" 945 " rc=%ld\n", 946 catalog_version_num, page_offset, hret); 947 kmem_cache_free(hv_page_cache, page); 948 949 pr_devel("catalog_read: offset=%lld(%lld) count=%zu " 950 "catalog_len=%zu(%zu) => %zd\n", offset, page_offset, 951 count, catalog_len, catalog_page_len, ret); 952 953 return ret; 954 } 955 956 #define PAGE_0_ATTR(_name, _fmt, _expr) \ 957 static ssize_t _name##_show(struct device *dev, \ 958 struct device_attribute *dev_attr, \ 959 char *buf) \ 960 { \ 961 unsigned long hret; \ 962 ssize_t ret = 0; \ 963 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \ 964 struct hv_24x7_catalog_page_0 *page_0 = page; \ 965 if (!page) \ 966 return -ENOMEM; \ 967 hret = h_get_24x7_catalog_page(page, 0, 0); \ 968 if (hret) { \ 969 ret = -EIO; \ 970 goto e_free; \ 971 } \ 972 ret = sprintf(buf, _fmt, _expr); \ 973 e_free: \ 974 kmem_cache_free(hv_page_cache, page); \ 975 return ret; \ 976 } \ 977 static DEVICE_ATTR_RO(_name) 978 979 PAGE_0_ATTR(catalog_version, "%lld\n", 980 (unsigned long long)be64_to_cpu(page_0->version)); 981 PAGE_0_ATTR(catalog_len, "%lld\n", 982 (unsigned long long)be32_to_cpu(page_0->length) * 4096); 983 static BIN_ATTR_RO(catalog, 0/* real length varies */); 984 985 static struct bin_attribute *if_bin_attrs[] = { 986 &bin_attr_catalog, 987 NULL, 988 }; 989 990 static struct attribute *if_attrs[] = { 991 &dev_attr_catalog_len.attr, 992 &dev_attr_catalog_version.attr, 993 NULL, 994 }; 995 996 static struct attribute_group if_group = { 997 .name = "interface", 998 .bin_attrs = if_bin_attrs, 999 .attrs = if_attrs, 1000 }; 1001 1002 static const struct attribute_group *attr_groups[] = { 1003 &format_group, 1004 &event_group, 1005 &event_desc_group, 1006 &event_long_desc_group, 1007 &if_group, 1008 NULL, 1009 }; 1010 1011 static void log_24x7_hcall(struct hv_24x7_request_buffer *request_buffer, 1012 struct hv_24x7_data_result_buffer *result_buffer, 1013 unsigned long ret) 1014 { 1015 struct hv_24x7_request *req; 1016 1017 req = &request_buffer->requests[0]; 1018 pr_notice_ratelimited("hcall failed: [%d %#x %#x %d] => " 1019 "ret 0x%lx (%ld) detail=0x%x failing ix=%x\n", 1020 req->performance_domain, req->data_offset, 1021 req->starting_ix, req->starting_lpar_ix, ret, ret, 1022 result_buffer->detailed_rc, 1023 result_buffer->failing_request_ix); 1024 } 1025 1026 /* 1027 * Start the process for a new H_GET_24x7_DATA hcall. 1028 */ 1029 static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer, 1030 struct hv_24x7_data_result_buffer *result_buffer) 1031 { 1032 1033 memset(request_buffer, 0, 4096); 1034 memset(result_buffer, 0, 4096); 1035 1036 request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT; 1037 /* memset above set request_buffer->num_requests to 0 */ 1038 } 1039 1040 /* 1041 * Commit (i.e perform) the H_GET_24x7_DATA hcall using the data collected 1042 * by 'init_24x7_request()' and 'add_event_to_24x7_request()'. 1043 */ 1044 static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer, 1045 struct hv_24x7_data_result_buffer *result_buffer) 1046 { 1047 unsigned long ret; 1048 1049 /* 1050 * NOTE: Due to variable number of array elements in request and 1051 * result buffer(s), sizeof() is not reliable. Use the actual 1052 * allocated buffer size, H24x7_DATA_BUFFER_SIZE. 1053 */ 1054 ret = plpar_hcall_norets(H_GET_24X7_DATA, 1055 virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE, 1056 virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE); 1057 1058 if (ret) 1059 log_24x7_hcall(request_buffer, result_buffer, ret); 1060 1061 return ret; 1062 } 1063 1064 /* 1065 * Add the given @event to the next slot in the 24x7 request_buffer. 1066 * 1067 * Note that H_GET_24X7_DATA hcall allows reading several counters' 1068 * values in a single HCALL. We expect the caller to add events to the 1069 * request buffer one by one, make the HCALL and process the results. 1070 */ 1071 static int add_event_to_24x7_request(struct perf_event *event, 1072 struct hv_24x7_request_buffer *request_buffer) 1073 { 1074 u16 idx; 1075 int i; 1076 struct hv_24x7_request *req; 1077 1078 if (request_buffer->num_requests > 254) { 1079 pr_devel("Too many requests for 24x7 HCALL %d\n", 1080 request_buffer->num_requests); 1081 return -EINVAL; 1082 } 1083 1084 if (is_physical_domain(event_get_domain(event))) 1085 idx = event_get_core(event); 1086 else 1087 idx = event_get_vcpu(event); 1088 1089 i = request_buffer->num_requests++; 1090 req = &request_buffer->requests[i]; 1091 1092 req->performance_domain = event_get_domain(event); 1093 req->data_size = cpu_to_be16(8); 1094 req->data_offset = cpu_to_be32(event_get_offset(event)); 1095 req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)), 1096 req->max_num_lpars = cpu_to_be16(1); 1097 req->starting_ix = cpu_to_be16(idx); 1098 req->max_ix = cpu_to_be16(1); 1099 1100 return 0; 1101 } 1102 1103 static unsigned long single_24x7_request(struct perf_event *event, u64 *count) 1104 { 1105 unsigned long ret; 1106 struct hv_24x7_request_buffer *request_buffer; 1107 struct hv_24x7_data_result_buffer *result_buffer; 1108 1109 BUILD_BUG_ON(sizeof(*request_buffer) > 4096); 1110 BUILD_BUG_ON(sizeof(*result_buffer) > 4096); 1111 1112 request_buffer = (void *)get_cpu_var(hv_24x7_reqb); 1113 result_buffer = (void *)get_cpu_var(hv_24x7_resb); 1114 1115 init_24x7_request(request_buffer, result_buffer); 1116 1117 ret = add_event_to_24x7_request(event, request_buffer); 1118 if (ret) 1119 goto out; 1120 1121 ret = make_24x7_request(request_buffer, result_buffer); 1122 if (ret) { 1123 log_24x7_hcall(request_buffer, result_buffer, ret); 1124 goto out; 1125 } 1126 1127 /* process result from hcall */ 1128 *count = be64_to_cpu(result_buffer->results[0].elements[0].element_data[0]); 1129 1130 out: 1131 put_cpu_var(hv_24x7_reqb); 1132 put_cpu_var(hv_24x7_resb); 1133 return ret; 1134 } 1135 1136 1137 static int h_24x7_event_init(struct perf_event *event) 1138 { 1139 struct hv_perf_caps caps; 1140 unsigned domain; 1141 unsigned long hret; 1142 u64 ct; 1143 1144 /* Not our event */ 1145 if (event->attr.type != event->pmu->type) 1146 return -ENOENT; 1147 1148 /* Unused areas must be 0 */ 1149 if (event_get_reserved1(event) || 1150 event_get_reserved2(event) || 1151 event_get_reserved3(event)) { 1152 pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n", 1153 event->attr.config, 1154 event_get_reserved1(event), 1155 event->attr.config1, 1156 event_get_reserved2(event), 1157 event->attr.config2, 1158 event_get_reserved3(event)); 1159 return -EINVAL; 1160 } 1161 1162 /* unsupported modes and filters */ 1163 if (event->attr.exclude_user || 1164 event->attr.exclude_kernel || 1165 event->attr.exclude_hv || 1166 event->attr.exclude_idle || 1167 event->attr.exclude_host || 1168 event->attr.exclude_guest) 1169 return -EINVAL; 1170 1171 /* no branch sampling */ 1172 if (has_branch_stack(event)) 1173 return -EOPNOTSUPP; 1174 1175 /* offset must be 8 byte aligned */ 1176 if (event_get_offset(event) % 8) { 1177 pr_devel("bad alignment\n"); 1178 return -EINVAL; 1179 } 1180 1181 /* Domains above 6 are invalid */ 1182 domain = event_get_domain(event); 1183 if (domain > 6) { 1184 pr_devel("invalid domain %d\n", domain); 1185 return -EINVAL; 1186 } 1187 1188 hret = hv_perf_caps_get(&caps); 1189 if (hret) { 1190 pr_devel("could not get capabilities: rc=%ld\n", hret); 1191 return -EIO; 1192 } 1193 1194 /* Physical domains & other lpars require extra capabilities */ 1195 if (!caps.collect_privileged && (is_physical_domain(domain) || 1196 (event_get_lpar(event) != event_get_lpar_max()))) { 1197 pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n", 1198 is_physical_domain(domain), 1199 event_get_lpar(event)); 1200 return -EACCES; 1201 } 1202 1203 /* see if the event complains */ 1204 if (single_24x7_request(event, &ct)) { 1205 pr_devel("test hcall failed\n"); 1206 return -EIO; 1207 } 1208 1209 return 0; 1210 } 1211 1212 static u64 h_24x7_get_value(struct perf_event *event) 1213 { 1214 unsigned long ret; 1215 u64 ct; 1216 ret = single_24x7_request(event, &ct); 1217 if (ret) 1218 /* We checked this in event init, shouldn't fail here... */ 1219 return 0; 1220 1221 return ct; 1222 } 1223 1224 static void update_event_count(struct perf_event *event, u64 now) 1225 { 1226 s64 prev; 1227 1228 prev = local64_xchg(&event->hw.prev_count, now); 1229 local64_add(now - prev, &event->count); 1230 } 1231 1232 static void h_24x7_event_read(struct perf_event *event) 1233 { 1234 u64 now; 1235 struct hv_24x7_request_buffer *request_buffer; 1236 struct hv_24x7_hw *h24x7hw; 1237 int txn_flags; 1238 1239 txn_flags = __this_cpu_read(hv_24x7_txn_flags); 1240 1241 /* 1242 * If in a READ transaction, add this counter to the list of 1243 * counters to read during the next HCALL (i.e commit_txn()). 1244 * If not in a READ transaction, go ahead and make the HCALL 1245 * to read this counter by itself. 1246 */ 1247 1248 if (txn_flags & PERF_PMU_TXN_READ) { 1249 int i; 1250 int ret; 1251 1252 if (__this_cpu_read(hv_24x7_txn_err)) 1253 return; 1254 1255 request_buffer = (void *)get_cpu_var(hv_24x7_reqb); 1256 1257 ret = add_event_to_24x7_request(event, request_buffer); 1258 if (ret) { 1259 __this_cpu_write(hv_24x7_txn_err, ret); 1260 } else { 1261 /* 1262 * Assoicate the event with the HCALL request index, 1263 * so ->commit_txn() can quickly find/update count. 1264 */ 1265 i = request_buffer->num_requests - 1; 1266 1267 h24x7hw = &get_cpu_var(hv_24x7_hw); 1268 h24x7hw->events[i] = event; 1269 put_cpu_var(h24x7hw); 1270 } 1271 1272 put_cpu_var(hv_24x7_reqb); 1273 } else { 1274 now = h_24x7_get_value(event); 1275 update_event_count(event, now); 1276 } 1277 } 1278 1279 static void h_24x7_event_start(struct perf_event *event, int flags) 1280 { 1281 if (flags & PERF_EF_RELOAD) 1282 local64_set(&event->hw.prev_count, h_24x7_get_value(event)); 1283 } 1284 1285 static void h_24x7_event_stop(struct perf_event *event, int flags) 1286 { 1287 h_24x7_event_read(event); 1288 } 1289 1290 static int h_24x7_event_add(struct perf_event *event, int flags) 1291 { 1292 if (flags & PERF_EF_START) 1293 h_24x7_event_start(event, flags); 1294 1295 return 0; 1296 } 1297 1298 /* 1299 * 24x7 counters only support READ transactions. They are 1300 * always counting and dont need/support ADD transactions. 1301 * Cache the flags, but otherwise ignore transactions that 1302 * are not PERF_PMU_TXN_READ. 1303 */ 1304 static void h_24x7_event_start_txn(struct pmu *pmu, unsigned int flags) 1305 { 1306 struct hv_24x7_request_buffer *request_buffer; 1307 struct hv_24x7_data_result_buffer *result_buffer; 1308 1309 /* We should not be called if we are already in a txn */ 1310 WARN_ON_ONCE(__this_cpu_read(hv_24x7_txn_flags)); 1311 1312 __this_cpu_write(hv_24x7_txn_flags, flags); 1313 if (flags & ~PERF_PMU_TXN_READ) 1314 return; 1315 1316 request_buffer = (void *)get_cpu_var(hv_24x7_reqb); 1317 result_buffer = (void *)get_cpu_var(hv_24x7_resb); 1318 1319 init_24x7_request(request_buffer, result_buffer); 1320 1321 put_cpu_var(hv_24x7_resb); 1322 put_cpu_var(hv_24x7_reqb); 1323 } 1324 1325 /* 1326 * Clean up transaction state. 1327 * 1328 * NOTE: Ignore state of request and result buffers for now. 1329 * We will initialize them during the next read/txn. 1330 */ 1331 static void reset_txn(void) 1332 { 1333 __this_cpu_write(hv_24x7_txn_flags, 0); 1334 __this_cpu_write(hv_24x7_txn_err, 0); 1335 } 1336 1337 /* 1338 * 24x7 counters only support READ transactions. They are always counting 1339 * and dont need/support ADD transactions. Clear ->txn_flags but otherwise 1340 * ignore transactions that are not of type PERF_PMU_TXN_READ. 1341 * 1342 * For READ transactions, submit all pending 24x7 requests (i.e requests 1343 * that were queued by h_24x7_event_read()), to the hypervisor and update 1344 * the event counts. 1345 */ 1346 static int h_24x7_event_commit_txn(struct pmu *pmu) 1347 { 1348 struct hv_24x7_request_buffer *request_buffer; 1349 struct hv_24x7_data_result_buffer *result_buffer; 1350 struct hv_24x7_result *resb; 1351 struct perf_event *event; 1352 u64 count; 1353 int i, ret, txn_flags; 1354 struct hv_24x7_hw *h24x7hw; 1355 1356 txn_flags = __this_cpu_read(hv_24x7_txn_flags); 1357 WARN_ON_ONCE(!txn_flags); 1358 1359 ret = 0; 1360 if (txn_flags & ~PERF_PMU_TXN_READ) 1361 goto out; 1362 1363 ret = __this_cpu_read(hv_24x7_txn_err); 1364 if (ret) 1365 goto out; 1366 1367 request_buffer = (void *)get_cpu_var(hv_24x7_reqb); 1368 result_buffer = (void *)get_cpu_var(hv_24x7_resb); 1369 1370 ret = make_24x7_request(request_buffer, result_buffer); 1371 if (ret) { 1372 log_24x7_hcall(request_buffer, result_buffer, ret); 1373 goto put_reqb; 1374 } 1375 1376 h24x7hw = &get_cpu_var(hv_24x7_hw); 1377 1378 /* Update event counts from hcall */ 1379 for (i = 0; i < request_buffer->num_requests; i++) { 1380 resb = &result_buffer->results[i]; 1381 count = be64_to_cpu(resb->elements[0].element_data[0]); 1382 event = h24x7hw->events[i]; 1383 h24x7hw->events[i] = NULL; 1384 update_event_count(event, count); 1385 } 1386 1387 put_cpu_var(hv_24x7_hw); 1388 1389 put_reqb: 1390 put_cpu_var(hv_24x7_resb); 1391 put_cpu_var(hv_24x7_reqb); 1392 out: 1393 reset_txn(); 1394 return ret; 1395 } 1396 1397 /* 1398 * 24x7 counters only support READ transactions. They are always counting 1399 * and dont need/support ADD transactions. However, regardless of type 1400 * of transaction, all we need to do is cleanup, so we don't have to check 1401 * the type of transaction. 1402 */ 1403 static void h_24x7_event_cancel_txn(struct pmu *pmu) 1404 { 1405 WARN_ON_ONCE(!__this_cpu_read(hv_24x7_txn_flags)); 1406 reset_txn(); 1407 } 1408 1409 static struct pmu h_24x7_pmu = { 1410 .task_ctx_nr = perf_invalid_context, 1411 1412 .name = "hv_24x7", 1413 .attr_groups = attr_groups, 1414 .event_init = h_24x7_event_init, 1415 .add = h_24x7_event_add, 1416 .del = h_24x7_event_stop, 1417 .start = h_24x7_event_start, 1418 .stop = h_24x7_event_stop, 1419 .read = h_24x7_event_read, 1420 .start_txn = h_24x7_event_start_txn, 1421 .commit_txn = h_24x7_event_commit_txn, 1422 .cancel_txn = h_24x7_event_cancel_txn, 1423 }; 1424 1425 static int hv_24x7_init(void) 1426 { 1427 int r; 1428 unsigned long hret; 1429 struct hv_perf_caps caps; 1430 1431 if (!firmware_has_feature(FW_FEATURE_LPAR)) { 1432 pr_debug("not a virtualized system, not enabling\n"); 1433 return -ENODEV; 1434 } 1435 1436 hret = hv_perf_caps_get(&caps); 1437 if (hret) { 1438 pr_debug("could not obtain capabilities, not enabling, rc=%ld\n", 1439 hret); 1440 return -ENODEV; 1441 } 1442 1443 hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL); 1444 if (!hv_page_cache) 1445 return -ENOMEM; 1446 1447 /* sampling not supported */ 1448 h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; 1449 1450 r = create_events_from_catalog(&event_group.attrs, 1451 &event_desc_group.attrs, 1452 &event_long_desc_group.attrs); 1453 1454 if (r) 1455 return r; 1456 1457 r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1); 1458 if (r) 1459 return r; 1460 1461 return 0; 1462 } 1463 1464 device_initcall(hv_24x7_init); 1465