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ACPI / util: cast data to u64 before shifting to fix sign extension
[deliverable/linux.git] / arch / powerpc / perf / hv-24x7.c
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 static unsigned long vmalloc_to_phys(void *v)
497 {
498 struct page *p = vmalloc_to_page(v);
499
500 BUG_ON(!p);
501 return page_to_phys(p) + offset_in_page(v);
502 }
503
504 /* */
505 struct event_uniq {
506 struct rb_node node;
507 const char *name;
508 int nl;
509 unsigned ct;
510 unsigned domain;
511 };
512
513 static int memord(const void *d1, size_t s1, const void *d2, size_t s2)
514 {
515 if (s1 < s2)
516 return 1;
517 if (s2 > s1)
518 return -1;
519
520 return memcmp(d1, d2, s1);
521 }
522
523 static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2,
524 size_t s2, unsigned d2)
525 {
526 int r = memord(v1, s1, v2, s2);
527
528 if (r)
529 return r;
530 if (d1 > d2)
531 return 1;
532 if (d2 > d1)
533 return -1;
534 return 0;
535 }
536
537 static int event_uniq_add(struct rb_root *root, const char *name, int nl,
538 unsigned domain)
539 {
540 struct rb_node **new = &(root->rb_node), *parent = NULL;
541 struct event_uniq *data;
542
543 /* Figure out where to put new node */
544 while (*new) {
545 struct event_uniq *it;
546 int result;
547
548 it = container_of(*new, struct event_uniq, node);
549 result = ev_uniq_ord(name, nl, domain, it->name, it->nl,
550 it->domain);
551
552 parent = *new;
553 if (result < 0)
554 new = &((*new)->rb_left);
555 else if (result > 0)
556 new = &((*new)->rb_right);
557 else {
558 it->ct++;
559 pr_info("found a duplicate event %.*s, ct=%u\n", nl,
560 name, it->ct);
561 return it->ct;
562 }
563 }
564
565 data = kmalloc(sizeof(*data), GFP_KERNEL);
566 if (!data)
567 return -ENOMEM;
568
569 *data = (struct event_uniq) {
570 .name = name,
571 .nl = nl,
572 .ct = 0,
573 .domain = domain,
574 };
575
576 /* Add new node and rebalance tree. */
577 rb_link_node(&data->node, parent, new);
578 rb_insert_color(&data->node, root);
579
580 /* data->ct */
581 return 0;
582 }
583
584 static void event_uniq_destroy(struct rb_root *root)
585 {
586 /*
587 * the strings we point to are in the giant block of memory filled by
588 * the catalog, and are freed separately.
589 */
590 struct event_uniq *pos, *n;
591
592 rbtree_postorder_for_each_entry_safe(pos, n, root, node)
593 kfree(pos);
594 }
595
596
597 /*
598 * ensure the event structure's sizes are self consistent and don't cause us to
599 * read outside of the event
600 *
601 * On success, return the event length in bytes.
602 * Otherwise, return -1 (and print as appropriate).
603 */
604 static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
605 size_t event_idx,
606 size_t event_data_bytes,
607 size_t event_entry_count,
608 size_t offset, void *end)
609 {
610 ssize_t ev_len;
611 void *ev_end, *calc_ev_end;
612
613 if (offset >= event_data_bytes)
614 return -1;
615
616 if (event_idx >= event_entry_count) {
617 pr_devel("catalog event data has %zu bytes of padding after last event\n",
618 event_data_bytes - offset);
619 return -1;
620 }
621
622 if (!event_fixed_portion_is_within(event, end)) {
623 pr_warn("event %zu fixed portion is not within range\n",
624 event_idx);
625 return -1;
626 }
627
628 ev_len = be16_to_cpu(event->length);
629
630 if (ev_len % 16)
631 pr_info("event %zu has length %zu not divisible by 16: event=%pK\n",
632 event_idx, ev_len, event);
633
634 ev_end = (__u8 *)event + ev_len;
635 if (ev_end > end) {
636 pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n",
637 event_idx, ev_len, ev_end, end,
638 offset);
639 return -1;
640 }
641
642 calc_ev_end = event_end(event, end);
643 if (!calc_ev_end) {
644 pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n",
645 event_idx, event_data_bytes, event, end,
646 offset);
647 return -1;
648 }
649
650 if (calc_ev_end > ev_end) {
651 pr_warn("event %zu exceeds it's own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n",
652 event_idx, event, ev_end, offset, calc_ev_end);
653 return -1;
654 }
655
656 return ev_len;
657 }
658
659 #define MAX_4K (SIZE_MAX / 4096)
660
661 static int create_events_from_catalog(struct attribute ***events_,
662 struct attribute ***event_descs_,
663 struct attribute ***event_long_descs_)
664 {
665 unsigned long hret;
666 size_t catalog_len, catalog_page_len, event_entry_count,
667 event_data_len, event_data_offs,
668 event_data_bytes, junk_events, event_idx, event_attr_ct, i,
669 attr_max, event_idx_last, desc_ct, long_desc_ct;
670 ssize_t ct, ev_len;
671 uint32_t catalog_version_num;
672 struct attribute **events, **event_descs, **event_long_descs;
673 struct hv_24x7_catalog_page_0 *page_0 =
674 kmem_cache_alloc(hv_page_cache, GFP_KERNEL);
675 void *page = page_0;
676 void *event_data, *end;
677 struct hv_24x7_event_data *event;
678 struct rb_root ev_uniq = RB_ROOT;
679 int ret = 0;
680
681 if (!page) {
682 ret = -ENOMEM;
683 goto e_out;
684 }
685
686 hret = h_get_24x7_catalog_page(page, 0, 0);
687 if (hret) {
688 ret = -EIO;
689 goto e_free;
690 }
691
692 catalog_version_num = be64_to_cpu(page_0->version);
693 catalog_page_len = be32_to_cpu(page_0->length);
694
695 if (MAX_4K < catalog_page_len) {
696 pr_err("invalid page count: %zu\n", catalog_page_len);
697 ret = -EIO;
698 goto e_free;
699 }
700
701 catalog_len = catalog_page_len * 4096;
702
703 event_entry_count = be16_to_cpu(page_0->event_entry_count);
704 event_data_offs = be16_to_cpu(page_0->event_data_offs);
705 event_data_len = be16_to_cpu(page_0->event_data_len);
706
707 pr_devel("cv %zu cl %zu eec %zu edo %zu edl %zu\n",
708 (size_t)catalog_version_num, catalog_len,
709 event_entry_count, event_data_offs, event_data_len);
710
711 if ((MAX_4K < event_data_len)
712 || (MAX_4K < event_data_offs)
713 || (MAX_4K - event_data_offs < event_data_len)) {
714 pr_err("invalid event data offs %zu and/or len %zu\n",
715 event_data_offs, event_data_len);
716 ret = -EIO;
717 goto e_free;
718 }
719
720 if ((event_data_offs + event_data_len) > catalog_page_len) {
721 pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n",
722 event_data_offs,
723 event_data_offs + event_data_len,
724 catalog_page_len);
725 ret = -EIO;
726 goto e_free;
727 }
728
729 if (SIZE_MAX / MAX_EVENTS_PER_EVENT_DATA - 1 < event_entry_count) {
730 pr_err("event_entry_count %zu is invalid\n",
731 event_entry_count);
732 ret = -EIO;
733 goto e_free;
734 }
735
736 event_data_bytes = event_data_len * 4096;
737
738 /*
739 * event data can span several pages, events can cross between these
740 * pages. Use vmalloc to make this easier.
741 */
742 event_data = vmalloc(event_data_bytes);
743 if (!event_data) {
744 pr_err("could not allocate event data\n");
745 ret = -ENOMEM;
746 goto e_free;
747 }
748
749 end = event_data + event_data_bytes;
750
751 /*
752 * using vmalloc_to_phys() like this only works if PAGE_SIZE is
753 * divisible by 4096
754 */
755 BUILD_BUG_ON(PAGE_SIZE % 4096);
756
757 for (i = 0; i < event_data_len; i++) {
758 hret = h_get_24x7_catalog_page_(
759 vmalloc_to_phys(event_data + i * 4096),
760 catalog_version_num,
761 i + event_data_offs);
762 if (hret) {
763 pr_err("failed to get event data in page %zu\n",
764 i + event_data_offs);
765 ret = -EIO;
766 goto e_event_data;
767 }
768 }
769
770 /*
771 * scan the catalog to determine the number of attributes we need, and
772 * verify it at the same time.
773 */
774 for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0;
775 ;
776 event_idx++, event = (void *)event + ev_len) {
777 size_t offset = (void *)event - (void *)event_data;
778 char *name;
779 int nl;
780
781 ev_len = catalog_event_len_validate(event, event_idx,
782 event_data_bytes,
783 event_entry_count,
784 offset, end);
785 if (ev_len < 0)
786 break;
787
788 name = event_name(event, &nl);
789
790 if (event->event_group_record_len == 0) {
791 pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n",
792 event_idx, nl, name);
793 junk_events++;
794 continue;
795 }
796
797 if (!catalog_entry_domain_is_valid(event->domain)) {
798 pr_info("event %zu (%.*s) has invalid domain %d\n",
799 event_idx, nl, name, event->domain);
800 junk_events++;
801 continue;
802 }
803
804 attr_max += event_to_attr_ct(event);
805 }
806
807 event_idx_last = event_idx;
808 if (event_idx_last != event_entry_count)
809 pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n",
810 event_idx_last, event_entry_count, junk_events);
811
812 events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL);
813 if (!events) {
814 ret = -ENOMEM;
815 goto e_event_data;
816 }
817
818 event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs),
819 GFP_KERNEL);
820 if (!event_descs) {
821 ret = -ENOMEM;
822 goto e_event_attrs;
823 }
824
825 event_long_descs = kmalloc_array(event_idx + 1,
826 sizeof(*event_long_descs), GFP_KERNEL);
827 if (!event_long_descs) {
828 ret = -ENOMEM;
829 goto e_event_descs;
830 }
831
832 /* Iterate over the catalog filling in the attribute vector */
833 for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0,
834 event = event_data, event_idx = 0;
835 event_idx < event_idx_last;
836 event_idx++, ev_len = be16_to_cpu(event->length),
837 event = (void *)event + ev_len) {
838 char *name;
839 int nl;
840 int nonce;
841 /*
842 * these are the only "bad" events that are intermixed and that
843 * we can ignore without issue. make sure to skip them here
844 */
845 if (event->event_group_record_len == 0)
846 continue;
847 if (!catalog_entry_domain_is_valid(event->domain))
848 continue;
849
850 name = event_name(event, &nl);
851 nonce = event_uniq_add(&ev_uniq, name, nl, event->domain);
852 ct = event_data_to_attrs(event_idx, events + event_attr_ct,
853 event, nonce);
854 if (ct <= 0) {
855 pr_warn("event %zu (%.*s) creation failure, skipping\n",
856 event_idx, nl, name);
857 junk_events++;
858 } else {
859 event_attr_ct += ct;
860 event_descs[desc_ct] = event_to_desc_attr(event, nonce);
861 if (event_descs[desc_ct])
862 desc_ct++;
863 event_long_descs[long_desc_ct] =
864 event_to_long_desc_attr(event, nonce);
865 if (event_long_descs[long_desc_ct])
866 long_desc_ct++;
867 }
868 }
869
870 pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n",
871 event_idx, event_attr_ct, junk_events, desc_ct);
872
873 events[event_attr_ct] = NULL;
874 event_descs[desc_ct] = NULL;
875 event_long_descs[long_desc_ct] = NULL;
876
877 event_uniq_destroy(&ev_uniq);
878 vfree(event_data);
879 kmem_cache_free(hv_page_cache, page);
880
881 *events_ = events;
882 *event_descs_ = event_descs;
883 *event_long_descs_ = event_long_descs;
884 return 0;
885
886 e_event_descs:
887 kfree(event_descs);
888 e_event_attrs:
889 kfree(events);
890 e_event_data:
891 vfree(event_data);
892 e_free:
893 kmem_cache_free(hv_page_cache, page);
894 e_out:
895 *events_ = NULL;
896 *event_descs_ = NULL;
897 *event_long_descs_ = NULL;
898 return ret;
899 }
900
901 static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
902 struct bin_attribute *bin_attr, char *buf,
903 loff_t offset, size_t count)
904 {
905 unsigned long hret;
906 ssize_t ret = 0;
907 size_t catalog_len = 0, catalog_page_len = 0;
908 loff_t page_offset = 0;
909 loff_t offset_in_page;
910 size_t copy_len;
911 uint64_t catalog_version_num = 0;
912 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER);
913 struct hv_24x7_catalog_page_0 *page_0 = page;
914
915 if (!page)
916 return -ENOMEM;
917
918 hret = h_get_24x7_catalog_page(page, 0, 0);
919 if (hret) {
920 ret = -EIO;
921 goto e_free;
922 }
923
924 catalog_version_num = be64_to_cpu(page_0->version);
925 catalog_page_len = be32_to_cpu(page_0->length);
926 catalog_len = catalog_page_len * 4096;
927
928 page_offset = offset / 4096;
929 offset_in_page = offset % 4096;
930
931 if (page_offset >= catalog_page_len)
932 goto e_free;
933
934 if (page_offset != 0) {
935 hret = h_get_24x7_catalog_page(page, catalog_version_num,
936 page_offset);
937 if (hret) {
938 ret = -EIO;
939 goto e_free;
940 }
941 }
942
943 copy_len = 4096 - offset_in_page;
944 if (copy_len > count)
945 copy_len = count;
946
947 memcpy(buf, page+offset_in_page, copy_len);
948 ret = copy_len;
949
950 e_free:
951 if (hret)
952 pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:"
953 " rc=%ld\n",
954 catalog_version_num, page_offset, hret);
955 kmem_cache_free(hv_page_cache, page);
956
957 pr_devel("catalog_read: offset=%lld(%lld) count=%zu "
958 "catalog_len=%zu(%zu) => %zd\n", offset, page_offset,
959 count, catalog_len, catalog_page_len, ret);
960
961 return ret;
962 }
963
964 #define PAGE_0_ATTR(_name, _fmt, _expr) \
965 static ssize_t _name##_show(struct device *dev, \
966 struct device_attribute *dev_attr, \
967 char *buf) \
968 { \
969 unsigned long hret; \
970 ssize_t ret = 0; \
971 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \
972 struct hv_24x7_catalog_page_0 *page_0 = page; \
973 if (!page) \
974 return -ENOMEM; \
975 hret = h_get_24x7_catalog_page(page, 0, 0); \
976 if (hret) { \
977 ret = -EIO; \
978 goto e_free; \
979 } \
980 ret = sprintf(buf, _fmt, _expr); \
981 e_free: \
982 kmem_cache_free(hv_page_cache, page); \
983 return ret; \
984 } \
985 static DEVICE_ATTR_RO(_name)
986
987 PAGE_0_ATTR(catalog_version, "%lld\n",
988 (unsigned long long)be64_to_cpu(page_0->version));
989 PAGE_0_ATTR(catalog_len, "%lld\n",
990 (unsigned long long)be32_to_cpu(page_0->length) * 4096);
991 static BIN_ATTR_RO(catalog, 0/* real length varies */);
992
993 static struct bin_attribute *if_bin_attrs[] = {
994 &bin_attr_catalog,
995 NULL,
996 };
997
998 static struct attribute *if_attrs[] = {
999 &dev_attr_catalog_len.attr,
1000 &dev_attr_catalog_version.attr,
1001 NULL,
1002 };
1003
1004 static struct attribute_group if_group = {
1005 .name = "interface",
1006 .bin_attrs = if_bin_attrs,
1007 .attrs = if_attrs,
1008 };
1009
1010 static const struct attribute_group *attr_groups[] = {
1011 &format_group,
1012 &event_group,
1013 &event_desc_group,
1014 &event_long_desc_group,
1015 &if_group,
1016 NULL,
1017 };
1018
1019 static void log_24x7_hcall(struct hv_24x7_request_buffer *request_buffer,
1020 struct hv_24x7_data_result_buffer *result_buffer,
1021 unsigned long ret)
1022 {
1023 struct hv_24x7_request *req;
1024
1025 req = &request_buffer->requests[0];
1026 pr_notice_ratelimited("hcall failed: [%d %#x %#x %d] => "
1027 "ret 0x%lx (%ld) detail=0x%x failing ix=%x\n",
1028 req->performance_domain, req->data_offset,
1029 req->starting_ix, req->starting_lpar_ix, ret, ret,
1030 result_buffer->detailed_rc,
1031 result_buffer->failing_request_ix);
1032 }
1033
1034 /*
1035 * Start the process for a new H_GET_24x7_DATA hcall.
1036 */
1037 static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer,
1038 struct hv_24x7_data_result_buffer *result_buffer)
1039 {
1040
1041 memset(request_buffer, 0, 4096);
1042 memset(result_buffer, 0, 4096);
1043
1044 request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT;
1045 /* memset above set request_buffer->num_requests to 0 */
1046 }
1047
1048 /*
1049 * Commit (i.e perform) the H_GET_24x7_DATA hcall using the data collected
1050 * by 'init_24x7_request()' and 'add_event_to_24x7_request()'.
1051 */
1052 static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer,
1053 struct hv_24x7_data_result_buffer *result_buffer)
1054 {
1055 unsigned long ret;
1056
1057 /*
1058 * NOTE: Due to variable number of array elements in request and
1059 * result buffer(s), sizeof() is not reliable. Use the actual
1060 * allocated buffer size, H24x7_DATA_BUFFER_SIZE.
1061 */
1062 ret = plpar_hcall_norets(H_GET_24X7_DATA,
1063 virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE,
1064 virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE);
1065
1066 if (ret)
1067 log_24x7_hcall(request_buffer, result_buffer, ret);
1068
1069 return ret;
1070 }
1071
1072 /*
1073 * Add the given @event to the next slot in the 24x7 request_buffer.
1074 *
1075 * Note that H_GET_24X7_DATA hcall allows reading several counters'
1076 * values in a single HCALL. We expect the caller to add events to the
1077 * request buffer one by one, make the HCALL and process the results.
1078 */
1079 static int add_event_to_24x7_request(struct perf_event *event,
1080 struct hv_24x7_request_buffer *request_buffer)
1081 {
1082 u16 idx;
1083 int i;
1084 struct hv_24x7_request *req;
1085
1086 if (request_buffer->num_requests > 254) {
1087 pr_devel("Too many requests for 24x7 HCALL %d\n",
1088 request_buffer->num_requests);
1089 return -EINVAL;
1090 }
1091
1092 if (is_physical_domain(event_get_domain(event)))
1093 idx = event_get_core(event);
1094 else
1095 idx = event_get_vcpu(event);
1096
1097 i = request_buffer->num_requests++;
1098 req = &request_buffer->requests[i];
1099
1100 req->performance_domain = event_get_domain(event);
1101 req->data_size = cpu_to_be16(8);
1102 req->data_offset = cpu_to_be32(event_get_offset(event));
1103 req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)),
1104 req->max_num_lpars = cpu_to_be16(1);
1105 req->starting_ix = cpu_to_be16(idx);
1106 req->max_ix = cpu_to_be16(1);
1107
1108 return 0;
1109 }
1110
1111 static unsigned long single_24x7_request(struct perf_event *event, u64 *count)
1112 {
1113 unsigned long ret;
1114 struct hv_24x7_request_buffer *request_buffer;
1115 struct hv_24x7_data_result_buffer *result_buffer;
1116
1117 BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
1118 BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
1119
1120 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1121 result_buffer = (void *)get_cpu_var(hv_24x7_resb);
1122
1123 init_24x7_request(request_buffer, result_buffer);
1124
1125 ret = add_event_to_24x7_request(event, request_buffer);
1126 if (ret)
1127 goto out;
1128
1129 ret = make_24x7_request(request_buffer, result_buffer);
1130 if (ret) {
1131 log_24x7_hcall(request_buffer, result_buffer, ret);
1132 goto out;
1133 }
1134
1135 /* process result from hcall */
1136 *count = be64_to_cpu(result_buffer->results[0].elements[0].element_data[0]);
1137
1138 out:
1139 put_cpu_var(hv_24x7_reqb);
1140 put_cpu_var(hv_24x7_resb);
1141 return ret;
1142 }
1143
1144
1145 static int h_24x7_event_init(struct perf_event *event)
1146 {
1147 struct hv_perf_caps caps;
1148 unsigned domain;
1149 unsigned long hret;
1150 u64 ct;
1151
1152 /* Not our event */
1153 if (event->attr.type != event->pmu->type)
1154 return -ENOENT;
1155
1156 /* Unused areas must be 0 */
1157 if (event_get_reserved1(event) ||
1158 event_get_reserved2(event) ||
1159 event_get_reserved3(event)) {
1160 pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n",
1161 event->attr.config,
1162 event_get_reserved1(event),
1163 event->attr.config1,
1164 event_get_reserved2(event),
1165 event->attr.config2,
1166 event_get_reserved3(event));
1167 return -EINVAL;
1168 }
1169
1170 /* unsupported modes and filters */
1171 if (event->attr.exclude_user ||
1172 event->attr.exclude_kernel ||
1173 event->attr.exclude_hv ||
1174 event->attr.exclude_idle ||
1175 event->attr.exclude_host ||
1176 event->attr.exclude_guest)
1177 return -EINVAL;
1178
1179 /* no branch sampling */
1180 if (has_branch_stack(event))
1181 return -EOPNOTSUPP;
1182
1183 /* offset must be 8 byte aligned */
1184 if (event_get_offset(event) % 8) {
1185 pr_devel("bad alignment\n");
1186 return -EINVAL;
1187 }
1188
1189 /* Domains above 6 are invalid */
1190 domain = event_get_domain(event);
1191 if (domain > 6) {
1192 pr_devel("invalid domain %d\n", domain);
1193 return -EINVAL;
1194 }
1195
1196 hret = hv_perf_caps_get(&caps);
1197 if (hret) {
1198 pr_devel("could not get capabilities: rc=%ld\n", hret);
1199 return -EIO;
1200 }
1201
1202 /* Physical domains & other lpars require extra capabilities */
1203 if (!caps.collect_privileged && (is_physical_domain(domain) ||
1204 (event_get_lpar(event) != event_get_lpar_max()))) {
1205 pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n",
1206 is_physical_domain(domain),
1207 event_get_lpar(event));
1208 return -EACCES;
1209 }
1210
1211 /* see if the event complains */
1212 if (single_24x7_request(event, &ct)) {
1213 pr_devel("test hcall failed\n");
1214 return -EIO;
1215 }
1216
1217 return 0;
1218 }
1219
1220 static u64 h_24x7_get_value(struct perf_event *event)
1221 {
1222 unsigned long ret;
1223 u64 ct;
1224 ret = single_24x7_request(event, &ct);
1225 if (ret)
1226 /* We checked this in event init, shouldn't fail here... */
1227 return 0;
1228
1229 return ct;
1230 }
1231
1232 static void update_event_count(struct perf_event *event, u64 now)
1233 {
1234 s64 prev;
1235
1236 prev = local64_xchg(&event->hw.prev_count, now);
1237 local64_add(now - prev, &event->count);
1238 }
1239
1240 static void h_24x7_event_read(struct perf_event *event)
1241 {
1242 u64 now;
1243 struct hv_24x7_request_buffer *request_buffer;
1244 struct hv_24x7_hw *h24x7hw;
1245 int txn_flags;
1246
1247 txn_flags = __this_cpu_read(hv_24x7_txn_flags);
1248
1249 /*
1250 * If in a READ transaction, add this counter to the list of
1251 * counters to read during the next HCALL (i.e commit_txn()).
1252 * If not in a READ transaction, go ahead and make the HCALL
1253 * to read this counter by itself.
1254 */
1255
1256 if (txn_flags & PERF_PMU_TXN_READ) {
1257 int i;
1258 int ret;
1259
1260 if (__this_cpu_read(hv_24x7_txn_err))
1261 return;
1262
1263 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1264
1265 ret = add_event_to_24x7_request(event, request_buffer);
1266 if (ret) {
1267 __this_cpu_write(hv_24x7_txn_err, ret);
1268 } else {
1269 /*
1270 * Assoicate the event with the HCALL request index,
1271 * so ->commit_txn() can quickly find/update count.
1272 */
1273 i = request_buffer->num_requests - 1;
1274
1275 h24x7hw = &get_cpu_var(hv_24x7_hw);
1276 h24x7hw->events[i] = event;
1277 put_cpu_var(h24x7hw);
1278 }
1279
1280 put_cpu_var(hv_24x7_reqb);
1281 } else {
1282 now = h_24x7_get_value(event);
1283 update_event_count(event, now);
1284 }
1285 }
1286
1287 static void h_24x7_event_start(struct perf_event *event, int flags)
1288 {
1289 if (flags & PERF_EF_RELOAD)
1290 local64_set(&event->hw.prev_count, h_24x7_get_value(event));
1291 }
1292
1293 static void h_24x7_event_stop(struct perf_event *event, int flags)
1294 {
1295 h_24x7_event_read(event);
1296 }
1297
1298 static int h_24x7_event_add(struct perf_event *event, int flags)
1299 {
1300 if (flags & PERF_EF_START)
1301 h_24x7_event_start(event, flags);
1302
1303 return 0;
1304 }
1305
1306 /*
1307 * 24x7 counters only support READ transactions. They are
1308 * always counting and dont need/support ADD transactions.
1309 * Cache the flags, but otherwise ignore transactions that
1310 * are not PERF_PMU_TXN_READ.
1311 */
1312 static void h_24x7_event_start_txn(struct pmu *pmu, unsigned int flags)
1313 {
1314 struct hv_24x7_request_buffer *request_buffer;
1315 struct hv_24x7_data_result_buffer *result_buffer;
1316
1317 /* We should not be called if we are already in a txn */
1318 WARN_ON_ONCE(__this_cpu_read(hv_24x7_txn_flags));
1319
1320 __this_cpu_write(hv_24x7_txn_flags, flags);
1321 if (flags & ~PERF_PMU_TXN_READ)
1322 return;
1323
1324 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1325 result_buffer = (void *)get_cpu_var(hv_24x7_resb);
1326
1327 init_24x7_request(request_buffer, result_buffer);
1328
1329 put_cpu_var(hv_24x7_resb);
1330 put_cpu_var(hv_24x7_reqb);
1331 }
1332
1333 /*
1334 * Clean up transaction state.
1335 *
1336 * NOTE: Ignore state of request and result buffers for now.
1337 * We will initialize them during the next read/txn.
1338 */
1339 static void reset_txn(void)
1340 {
1341 __this_cpu_write(hv_24x7_txn_flags, 0);
1342 __this_cpu_write(hv_24x7_txn_err, 0);
1343 }
1344
1345 /*
1346 * 24x7 counters only support READ transactions. They are always counting
1347 * and dont need/support ADD transactions. Clear ->txn_flags but otherwise
1348 * ignore transactions that are not of type PERF_PMU_TXN_READ.
1349 *
1350 * For READ transactions, submit all pending 24x7 requests (i.e requests
1351 * that were queued by h_24x7_event_read()), to the hypervisor and update
1352 * the event counts.
1353 */
1354 static int h_24x7_event_commit_txn(struct pmu *pmu)
1355 {
1356 struct hv_24x7_request_buffer *request_buffer;
1357 struct hv_24x7_data_result_buffer *result_buffer;
1358 struct hv_24x7_result *resb;
1359 struct perf_event *event;
1360 u64 count;
1361 int i, ret, txn_flags;
1362 struct hv_24x7_hw *h24x7hw;
1363
1364 txn_flags = __this_cpu_read(hv_24x7_txn_flags);
1365 WARN_ON_ONCE(!txn_flags);
1366
1367 ret = 0;
1368 if (txn_flags & ~PERF_PMU_TXN_READ)
1369 goto out;
1370
1371 ret = __this_cpu_read(hv_24x7_txn_err);
1372 if (ret)
1373 goto out;
1374
1375 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1376 result_buffer = (void *)get_cpu_var(hv_24x7_resb);
1377
1378 ret = make_24x7_request(request_buffer, result_buffer);
1379 if (ret) {
1380 log_24x7_hcall(request_buffer, result_buffer, ret);
1381 goto put_reqb;
1382 }
1383
1384 h24x7hw = &get_cpu_var(hv_24x7_hw);
1385
1386 /* Update event counts from hcall */
1387 for (i = 0; i < request_buffer->num_requests; i++) {
1388 resb = &result_buffer->results[i];
1389 count = be64_to_cpu(resb->elements[0].element_data[0]);
1390 event = h24x7hw->events[i];
1391 h24x7hw->events[i] = NULL;
1392 update_event_count(event, count);
1393 }
1394
1395 put_cpu_var(hv_24x7_hw);
1396
1397 put_reqb:
1398 put_cpu_var(hv_24x7_resb);
1399 put_cpu_var(hv_24x7_reqb);
1400 out:
1401 reset_txn();
1402 return ret;
1403 }
1404
1405 /*
1406 * 24x7 counters only support READ transactions. They are always counting
1407 * and dont need/support ADD transactions. However, regardless of type
1408 * of transaction, all we need to do is cleanup, so we don't have to check
1409 * the type of transaction.
1410 */
1411 static void h_24x7_event_cancel_txn(struct pmu *pmu)
1412 {
1413 WARN_ON_ONCE(!__this_cpu_read(hv_24x7_txn_flags));
1414 reset_txn();
1415 }
1416
1417 static struct pmu h_24x7_pmu = {
1418 .task_ctx_nr = perf_invalid_context,
1419
1420 .name = "hv_24x7",
1421 .attr_groups = attr_groups,
1422 .event_init = h_24x7_event_init,
1423 .add = h_24x7_event_add,
1424 .del = h_24x7_event_stop,
1425 .start = h_24x7_event_start,
1426 .stop = h_24x7_event_stop,
1427 .read = h_24x7_event_read,
1428 .start_txn = h_24x7_event_start_txn,
1429 .commit_txn = h_24x7_event_commit_txn,
1430 .cancel_txn = h_24x7_event_cancel_txn,
1431 };
1432
1433 static int hv_24x7_init(void)
1434 {
1435 int r;
1436 unsigned long hret;
1437 struct hv_perf_caps caps;
1438
1439 if (!firmware_has_feature(FW_FEATURE_LPAR)) {
1440 pr_debug("not a virtualized system, not enabling\n");
1441 return -ENODEV;
1442 }
1443
1444 hret = hv_perf_caps_get(&caps);
1445 if (hret) {
1446 pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
1447 hret);
1448 return -ENODEV;
1449 }
1450
1451 hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL);
1452 if (!hv_page_cache)
1453 return -ENOMEM;
1454
1455 /* sampling not supported */
1456 h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
1457
1458 r = create_events_from_catalog(&event_group.attrs,
1459 &event_desc_group.attrs,
1460 &event_long_desc_group.attrs);
1461
1462 if (r)
1463 return r;
1464
1465 r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1);
1466 if (r)
1467 return r;
1468
1469 return 0;
1470 }
1471
1472 device_initcall(hv_24x7_init);
Linux kernel - Deliverables
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