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Merge tag 'char-misc-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[linux-2.6-block.git] / arch / powerpc / perf / hv-24x7.c
CommitLineData
0e93a6ed
CS		 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>
5c5cd7b5 16#include <linux/rbtree.h>
0e93a6ed
CS		 17#include <linux/module.h>
18#include <linux/slab.h>
5c5cd7b5
CS		 19#include <linux/vmalloc.h>
20
0e93a6ed
CS		 21#include <asm/firmware.h>
22#include <asm/hvcall.h>
23#include <asm/io.h>
5c5cd7b5 24#include <linux/byteorder/generic.h>
0e93a6ed
CS		 25
26#include "hv-24x7.h"
27#include "hv-24x7-catalog.h"
28#include "hv-common.h"
29
5c5cd7b5
CS		 30static 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
44static 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
58static 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
71static bool catalog_entry_domain_is_valid(unsigned domain)
72{
73 return is_physical_domain(domain);
74}
75
0e93a6ed
CS		 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:
5c5cd7b5 97 * perf stat -e 'hv_24x7/domain=2,offset=8,vcpu=0,lpar=0xffffffff/'
0e93a6ed
CS		 98 */
99
100/* u3 0-6, one of HV_24X7_PERF_DOMAIN */
101EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3);
102/* u16 */
5c5cd7b5
CS		 103EVENT_DEFINE_RANGE_FORMAT(core, config, 16, 31);
104EVENT_DEFINE_RANGE_FORMAT(vcpu, config, 16, 31);
0e93a6ed
CS		 105/* u32, see "data_offset" */
106EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63);
107/* u16 */
108EVENT_DEFINE_RANGE_FORMAT(lpar, config1, 0, 15);
109
110EVENT_DEFINE_RANGE(reserved1, config, 4, 15);
111EVENT_DEFINE_RANGE(reserved2, config1, 16, 63);
112EVENT_DEFINE_RANGE(reserved3, config2, 0, 63);
113
114static struct attribute *format_attrs[] = {
115 &format_attr_domain.attr,
116 &format_attr_offset.attr,
5c5cd7b5
CS		 117 &format_attr_core.attr,
118 &format_attr_vcpu.attr,
0e93a6ed
CS		 119 &format_attr_lpar.attr,
120 NULL,
121};
122
123static struct attribute_group format_group = {
124 .name = "format",
125 .attrs = format_attrs,
126};
127
5c5cd7b5
CS		 128static struct attribute_group event_group = {
129 .name = "events",
130 /* .attrs is set in init */
131};
132
133static struct attribute_group event_desc_group = {
134 .name = "event_descs",
135 /* .attrs is set in init */
136};
137
138static struct attribute_group event_long_desc_group = {
139 .name = "event_long_descs",
140 /* .attrs is set in init */
141};
142
0e93a6ed
CS		 143static struct kmem_cache *hv_page_cache;
144
88a48613
SB		 145DEFINE_PER_CPU(int, hv_24x7_txn_flags);
146DEFINE_PER_CPU(int, hv_24x7_txn_err);
147
148struct hv_24x7_hw {
149 struct perf_event *events[255];
150};
151
152DEFINE_PER_CPU(struct hv_24x7_hw, hv_24x7_hw);
153
145264e2
SB		 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
160DEFINE_PER_CPU(char, hv_24x7_reqb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096);
161DEFINE_PER_CPU(char, hv_24x7_resb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096);
162
5c5cd7b5
CS		 163static 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
169static 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);
3ca4ea71 173
5c5cd7b5
CS		 174 *len = be16_to_cpu(*desc_len) - 2;
175 return (char *)ev->remainder + nl;
176}
177
178static 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);
3ca4ea71 184
5c5cd7b5
CS		 185 *len = be16_to_cpu(*long_desc_len) - 2;
186 return (char *)ev->remainder + nl + desc_len;
187}
188
189static 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 */
205static 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
78d13166
CS		 257static unsigned long h_get_24x7_catalog_page_(unsigned long phys_4096,
258 unsigned long version,
259 unsigned long index)
0e93a6ed 260{
78d13166 261 pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)",
3ca4ea71
SB		 262 phys_4096, version, index);
263
78d13166 264 WARN_ON(!IS_ALIGNED(phys_4096, 4096));
3ca4ea71 265
0e93a6ed 266 return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE,
3ca4ea71 267 phys_4096, version, index);
0e93a6ed
CS		 268}
269
1ee9fcc1 270static unsigned long h_get_24x7_catalog_page(char page[],
bbad3e50 271 u64 version, u32 index)
78d13166
CS		 272{
273 return h_get_24x7_catalog_page_(virt_to_phys(page),
274 version, index);
275}
276
5c5cd7b5
CS		 277static 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
287static 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 */
310static 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
315static 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);
3ca4ea71 321
5c5cd7b5
CS		 322 return sprintf(buf, "%s\n", (char *)d->var);
323}
324
325static 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
442053e5
SB		 332 sysfs_attr_init(&attr->attr.attr);
333
5c5cd7b5
CS		 334 attr->var = str;
335 attr->attr.attr.name = name;
336 attr->attr.attr.mode = 0444;
337 attr->attr.show = device_show_string;
3ca4ea71 338
5c5cd7b5
CS		 339 return &attr->attr.attr;
340}
341
342static 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;
366out_n:
367 kfree(n);
368out_s:
369 kfree(s);
370 return NULL;
371}
372
373static 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
383static 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
5c5cd7b5
CS		 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;
420out_name:
421 kfree(a_ev_name);
422out_val:
423 kfree(val);
424 return NULL;
425}
426
427static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event,
40386217 428 int nonce)
5c5cd7b5
CS		 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
441static struct attribute *
442event_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
455static ssize_t event_data_to_attrs(unsigned ix, struct attribute **attrs,
40386217 456 struct hv_24x7_event_data *event, int nonce)
5c5cd7b5
CS		 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
484static 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
5c5cd7b5
CS		 496/* */
497struct event_uniq {
498 struct rb_node node;
499 const char *name;
500 int nl;
501 unsigned ct;
502 unsigned domain;
503};
504
505static 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
515static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2,
40386217 516 size_t s2, unsigned d2)
5c5cd7b5
CS		 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
529static int event_uniq_add(struct rb_root *root, const char *name, int nl,
40386217 530 unsigned domain)
5c5cd7b5
CS		 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
576static 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 */
596static 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
7debc970 653static int create_events_from_catalog(struct attribute ***events_,
40386217
SB		 654 struct attribute ***event_descs_,
655 struct attribute ***event_long_descs_)
5c5cd7b5
CS		 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;
7debc970 671 int ret = 0;
5c5cd7b5 672
7debc970
LZ		 673 if (!page) {
674 ret = -ENOMEM;
5c5cd7b5 675 goto e_out;
7debc970 676 }
5c5cd7b5
CS		 677
678 hret = h_get_24x7_catalog_page(page, 0, 0);
7debc970
LZ		 679 if (hret) {
680 ret = -EIO;
5c5cd7b5 681 goto e_free;
7debc970 682 }
5c5cd7b5
CS		 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);
7debc970 689 ret = -EIO;
5c5cd7b5
CS		 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);
7debc970 708 ret = -EIO;
5c5cd7b5
CS		 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);
7debc970 717 ret = -EIO;
5c5cd7b5
CS		 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);
7debc970 724 ret = -EIO;
5c5cd7b5
CS		 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");
7debc970 737 ret = -ENOMEM;
5c5cd7b5
CS		 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);
7debc970 757 ret = -EIO;
5c5cd7b5
CS		 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);
7debc970
LZ		 805 if (!events) {
806 ret = -ENOMEM;
5c5cd7b5 807 goto e_event_data;
7debc970 808 }
5c5cd7b5
CS		 809
810 event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs),
811 GFP_KERNEL);
7debc970
LZ		 812 if (!event_descs) {
813 ret = -ENOMEM;
5c5cd7b5 814 goto e_event_attrs;
7debc970 815 }
5c5cd7b5
CS		 816
817 event_long_descs = kmalloc_array(event_idx + 1,
818 sizeof(*event_long_descs), GFP_KERNEL);
7debc970
LZ		 819 if (!event_long_descs) {
820 ret = -ENOMEM;
5c5cd7b5 821 goto e_event_descs;
7debc970 822 }
5c5cd7b5
CS		 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;
7debc970 876 return 0;
5c5cd7b5
CS		 877
878e_event_descs:
879 kfree(event_descs);
880e_event_attrs:
881 kfree(events);
882e_event_data:
883 vfree(event_data);
884e_free:
885 kmem_cache_free(hv_page_cache, page);
886e_out:
887 *events_ = NULL;
888 *event_descs_ = NULL;
889 *event_long_descs_ = NULL;
7debc970 890 return ret;
5c5cd7b5
CS		 891}
892
0e93a6ed
CS		 893static 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;
56f12bee 899 size_t catalog_len = 0, catalog_page_len = 0;
0e93a6ed 900 loff_t page_offset = 0;
56f12bee 901 loff_t offset_in_page;
902 size_t copy_len;
bbad3e50 903 uint64_t catalog_version_num = 0;
0e93a6ed
CS		 904 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER);
905 struct hv_24x7_catalog_page_0 *page_0 = page;
3ca4ea71 906
0e93a6ed
CS		 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
bbad3e50 916 catalog_version_num = be64_to_cpu(page_0->version);
0e93a6ed
CS		 917 catalog_page_len = be32_to_cpu(page_0->length);
918 catalog_len = catalog_page_len * 4096;
919
920 page_offset = offset / 4096;
56f12bee 921 offset_in_page = offset % 4096;
0e93a6ed
CS		 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
56f12bee 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
0e93a6ed
CS		 942e_free:
943 if (hret)
bbad3e50
CS		 944 pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:"
945 " rc=%ld\n",
946 catalog_version_num, page_offset, hret);
d6589722 947 kmem_cache_free(hv_page_cache, page);
0e93a6ed 948
56f12bee 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);
0e93a6ed
CS		 952
953 return ret;
954}
955
956#define PAGE_0_ATTR(_name, _fmt, _expr) \
957static 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); \
973e_free: \
ec2aef5a 974 kmem_cache_free(hv_page_cache, page); \
0e93a6ed
CS		 975 return ret; \
976} \
977static DEVICE_ATTR_RO(_name)
978
979PAGE_0_ATTR(catalog_version, "%lld\n",
bbad3e50 980 (unsigned long long)be64_to_cpu(page_0->version));
0e93a6ed
CS		 981PAGE_0_ATTR(catalog_len, "%lld\n",
982 (unsigned long long)be32_to_cpu(page_0->length) * 4096);
983static BIN_ATTR_RO(catalog, 0/* real length varies */);
984
985static struct bin_attribute *if_bin_attrs[] = {
986 &bin_attr_catalog,
987 NULL,
988};
989
990static struct attribute *if_attrs[] = {
991 &dev_attr_catalog_len.attr,
992 &dev_attr_catalog_version.attr,
993 NULL,
994};
995
996static struct attribute_group if_group = {
997 .name = "interface",
998 .bin_attrs = if_bin_attrs,
999 .attrs = if_attrs,
1000};
1001
1002static const struct attribute_group *attr_groups[] = {
1003 &format_group,
5c5cd7b5
CS		 1004 &event_group,
1005 &event_desc_group,
1006 &event_long_desc_group,
0e93a6ed
CS		 1007 &if_group,
1008 NULL,
1009};
1010
f954825d 1011static void log_24x7_hcall(struct hv_24x7_request_buffer *request_buffer,
40386217
SB		 1012 struct hv_24x7_data_result_buffer *result_buffer,
1013 unsigned long ret)
f954825d
SB		 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
aeab199d
SB		 1026/*
1027 * Start the process for a new H_GET_24x7_DATA hcall.
1028 */
1029static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer,
40386217 1030 struct hv_24x7_data_result_buffer *result_buffer)
aeab199d
SB		 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}
f34b6c72 1039
aeab199d
SB		 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 */
1044static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer,
40386217 1045 struct hv_24x7_data_result_buffer *result_buffer)
0e93a6ed 1046{
f34b6c72 1047 unsigned long ret;
0e93a6ed
CS		 1048
1049 /*
aeab199d
SB		 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.
0e93a6ed 1053 */
aeab199d
SB		 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
e3ee15dc
SB		 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 */
1071static int add_event_to_24x7_request(struct perf_event *event,
1072 struct hv_24x7_request_buffer *request_buffer)
0e93a6ed 1073{
80798764 1074 u16 idx;
e3ee15dc
SB		 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
1103static unsigned long single_24x7_request(struct perf_event *event, u64 *count)
1104{
f34b6c72 1105 unsigned long ret;
145264e2
SB		 1106 struct hv_24x7_request_buffer *request_buffer;
1107 struct hv_24x7_data_result_buffer *result_buffer;
48bee8a6
CS		 1108
1109 BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
1110 BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
1111
f34b6c72 1112 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1113 result_buffer = (void *)get_cpu_var(hv_24x7_resb);
48bee8a6 1114
aeab199d 1115 init_24x7_request(request_buffer, result_buffer);
0e93a6ed 1116
e3ee15dc
SB		 1117 ret = add_event_to_24x7_request(event, request_buffer);
1118 if (ret)
b816ce67 1119 goto out;
0e93a6ed 1120
aeab199d 1121 ret = make_24x7_request(request_buffer, result_buffer);
0e93a6ed 1122 if (ret) {
f954825d 1123 log_24x7_hcall(request_buffer, result_buffer, ret);
f34b6c72 1124 goto out;
0e93a6ed
CS		 1125 }
1126
aeab199d 1127 /* process result from hcall */
465345ca 1128 *count = be64_to_cpu(result_buffer->results[0].elements[0].element_data[0]);
48bee8a6 1129
48bee8a6 1130out:
b816ce67
SB		 1131 put_cpu_var(hv_24x7_reqb);
1132 put_cpu_var(hv_24x7_resb);
0e93a6ed
CS		 1133 return ret;
1134}
1135
0e93a6ed
CS		 1136
1137static 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 ||
cc56d673 1168 event->attr.exclude_guest)
0e93a6ed
CS		 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
5c5cd7b5 1194 /* Physical domains & other lpars require extra capabilities */
0e93a6ed
CS		 1195 if (!caps.collect_privileged && (is_physical_domain(domain) ||
1196 (event_get_lpar(event) != event_get_lpar_max()))) {
f42cf8d6 1197 pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n",
0e93a6ed
CS		 1198 is_physical_domain(domain),
1199 event_get_lpar(event));
1200 return -EACCES;
1201 }
1202
1203 /* see if the event complains */
80798764 1204 if (single_24x7_request(event, &ct)) {
0e93a6ed
CS		 1205 pr_devel("test hcall failed\n");
1206 return -EIO;
1207 }
1208
1209 return 0;
1210}
1211
1212static u64 h_24x7_get_value(struct perf_event *event)
1213{
1214 unsigned long ret;
1215 u64 ct;
80798764 1216 ret = single_24x7_request(event, &ct);
0e93a6ed
CS		 1217 if (ret)
1218 /* We checked this in event init, shouldn't fail here... */
1219 return 0;
1220
1221 return ct;
1222}
1223
529ce8c9 1224static void update_event_count(struct perf_event *event, u64 now)
0e93a6ed
CS		 1225{
1226 s64 prev;
3ca4ea71 1227
0e93a6ed
CS		 1228 prev = local64_xchg(&event->hw.prev_count, now);
1229 local64_add(now - prev, &event->count);
1230}
1231
529ce8c9
SB		 1232static void h_24x7_event_read(struct perf_event *event)
1233{
1234 u64 now;
88a48613
SB		 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;
529ce8c9 1251
88a48613
SB		 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 }
529ce8c9
SB		 1277}
1278
0e93a6ed
CS		 1279static 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
1285static void h_24x7_event_stop(struct perf_event *event, int flags)
1286{
33ba14c0 1287 h_24x7_event_read(event);
0e93a6ed
CS		 1288}
1289
1290static 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
88a48613
SB		 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 */
1304static 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 */
1331static 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 */
1346static 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
1389put_reqb:
1390 put_cpu_var(hv_24x7_resb);
1391 put_cpu_var(hv_24x7_reqb);
1392out:
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 */
1403static 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
0e93a6ed
CS		 1409static 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,
33ba14c0 1419 .read = h_24x7_event_read,
88a48613
SB		 1420 .start_txn = h_24x7_event_start_txn,
1421 .commit_txn = h_24x7_event_commit_txn,
1422 .cancel_txn = h_24x7_event_cancel_txn,
0e93a6ed
CS		 1423};
1424
1425static 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)) {
e98bf005 1432 pr_debug("not a virtualized system, not enabling\n");
0e93a6ed
CS		 1433 return -ENODEV;
1434 }
1435
1436 hret = hv_perf_caps_get(&caps);
1437 if (hret) {
e98bf005 1438 pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
0e93a6ed
CS		 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
cc56d673
VW		 1447 /* sampling not supported */
1448 h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
1449
7debc970 1450 r = create_events_from_catalog(&event_group.attrs,
5c5cd7b5
CS		 1451 &event_desc_group.attrs,
1452 &event_long_desc_group.attrs);
1453
7debc970
LZ		 1454 if (r)
1455 return r;
1456
0e93a6ed
CS		 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
1464device_initcall(hv_24x7_init);
Linux 6.x block layer and io_uring tree(s)