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powerpc/perf/hv-24x7: Drop event_24x7_request()
[linux/fpc-iii.git] / arch / powerpc / perf / hv-24x7.c
blobf509f3bd7d2a8be76173734d67cdb0a47926b541
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 /*
146 * request_buffer and result_buffer are not required to be 4k aligned,
147 * but are not allowed to cross any 4k boundary. Aligning them to 4k is
148 * the simplest way to ensure that.
149 */
150 #define H24x7_DATA_BUFFER_SIZE 4096
151 DEFINE_PER_CPU(char, hv_24x7_reqb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096);
152 DEFINE_PER_CPU(char, hv_24x7_resb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096);
153
154 static char *event_name(struct hv_24x7_event_data *ev, int *len)
155 {
156 *len = be16_to_cpu(ev->event_name_len) - 2;
157 return (char *)ev->remainder;
158 }
159
160 static char *event_desc(struct hv_24x7_event_data *ev, int *len)
161 {
162 unsigned nl = be16_to_cpu(ev->event_name_len);
163 __be16 *desc_len = (__be16 *)(ev->remainder + nl - 2);
164 *len = be16_to_cpu(*desc_len) - 2;
165 return (char *)ev->remainder + nl;
166 }
167
168 static char *event_long_desc(struct hv_24x7_event_data *ev, int *len)
169 {
170 unsigned nl = be16_to_cpu(ev->event_name_len);
171 __be16 *desc_len_ = (__be16 *)(ev->remainder + nl - 2);
172 unsigned desc_len = be16_to_cpu(*desc_len_);
173 __be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2);
174 *len = be16_to_cpu(*long_desc_len) - 2;
175 return (char *)ev->remainder + nl + desc_len;
176 }
177
178 static bool event_fixed_portion_is_within(struct hv_24x7_event_data *ev,
179 void *end)
180 {
181 void *start = ev;
182
183 return (start + offsetof(struct hv_24x7_event_data, remainder)) < end;
184 }
185
186 /*
187 * Things we don't check:
188 * - padding for desc, name, and long/detailed desc is required to be '\0'
189 * bytes.
190 *
191 * Return NULL if we pass end,
192 * Otherwise return the address of the byte just following the event.
193 */
194 static void *event_end(struct hv_24x7_event_data *ev, void *end)
195 {
196 void *start = ev;
197 __be16 *dl_, *ldl_;
198 unsigned dl, ldl;
199 unsigned nl = be16_to_cpu(ev->event_name_len);
200
201 if (nl < 2) {
202 pr_debug("%s: name length too short: %d", __func__, nl);
203 return NULL;
204 }
205
206 if (start + nl > end) {
207 pr_debug("%s: start=%p + nl=%u > end=%p",
208 __func__, start, nl, end);
209 return NULL;
210 }
211
212 dl_ = (__be16 *)(ev->remainder + nl - 2);
213 if (!IS_ALIGNED((uintptr_t)dl_, 2))
214 pr_warn("desc len not aligned %p", dl_);
215 dl = be16_to_cpu(*dl_);
216 if (dl < 2) {
217 pr_debug("%s: desc len too short: %d", __func__, dl);
218 return NULL;
219 }
220
221 if (start + nl + dl > end) {
222 pr_debug("%s: (start=%p + nl=%u + dl=%u)=%p > end=%p",
223 __func__, start, nl, dl, start + nl + dl, end);
224 return NULL;
225 }
226
227 ldl_ = (__be16 *)(ev->remainder + nl + dl - 2);
228 if (!IS_ALIGNED((uintptr_t)ldl_, 2))
229 pr_warn("long desc len not aligned %p", ldl_);
230 ldl = be16_to_cpu(*ldl_);
231 if (ldl < 2) {
232 pr_debug("%s: long desc len too short (ldl=%u)",
233 __func__, ldl);
234 return NULL;
235 }
236
237 if (start + nl + dl + ldl > end) {
238 pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p",
239 __func__, start, nl, dl, ldl, end);
240 return NULL;
241 }
242
243 return start + nl + dl + ldl;
244 }
245
246 static unsigned long h_get_24x7_catalog_page_(unsigned long phys_4096,
247 unsigned long version,
248 unsigned long index)
249 {
250 pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)",
251 phys_4096,
252 version,
253 index);
254 WARN_ON(!IS_ALIGNED(phys_4096, 4096));
255 return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE,
256 phys_4096,
257 version,
258 index);
259 }
260
261 static unsigned long h_get_24x7_catalog_page(char page[],
262 u64 version, u32 index)
263 {
264 return h_get_24x7_catalog_page_(virt_to_phys(page),
265 version, index);
266 }
267
268 static unsigned core_domains[] = {
269 HV_PERF_DOMAIN_PHYS_CORE,
270 HV_PERF_DOMAIN_VCPU_HOME_CORE,
271 HV_PERF_DOMAIN_VCPU_HOME_CHIP,
272 HV_PERF_DOMAIN_VCPU_HOME_NODE,
273 HV_PERF_DOMAIN_VCPU_REMOTE_NODE,
274 };
275 /* chip event data always yeilds a single event, core yeilds multiple */
276 #define MAX_EVENTS_PER_EVENT_DATA ARRAY_SIZE(core_domains)
277
278 static char *event_fmt(struct hv_24x7_event_data *event, unsigned domain)
279 {
280 const char *sindex;
281 const char *lpar;
282
283 if (is_physical_domain(domain)) {
284 lpar = "0x0";
285 sindex = "core";
286 } else {
287 lpar = "?";
288 sindex = "vcpu";
289 }
290
291 return kasprintf(GFP_KERNEL,
292 "domain=0x%x,offset=0x%x,%s=?,lpar=%s",
293 domain,
294 be16_to_cpu(event->event_counter_offs) +
295 be16_to_cpu(event->event_group_record_offs),
296 sindex,
297 lpar);
298 }
299
300 /* Avoid trusting fw to NUL terminate strings */
301 static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp)
302 {
303 return kasprintf(gfp, "%.*s", max_len, maybe_str);
304 }
305
306 static ssize_t device_show_string(struct device *dev,
307 struct device_attribute *attr, char *buf)
308 {
309 struct dev_ext_attribute *d;
310
311 d = container_of(attr, struct dev_ext_attribute, attr);
312 return sprintf(buf, "%s\n", (char *)d->var);
313 }
314
315 static struct attribute *device_str_attr_create_(char *name, char *str)
316 {
317 struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL);
318
319 if (!attr)
320 return NULL;
321
322 attr->var = str;
323 attr->attr.attr.name = name;
324 attr->attr.attr.mode = 0444;
325 attr->attr.show = device_show_string;
326 return &attr->attr.attr;
327 }
328
329 static struct attribute *device_str_attr_create(char *name, int name_max,
330 int name_nonce,
331 char *str, size_t str_max)
332 {
333 char *n;
334 char *s = memdup_to_str(str, str_max, GFP_KERNEL);
335 struct attribute *a;
336
337 if (!s)
338 return NULL;
339
340 if (!name_nonce)
341 n = kasprintf(GFP_KERNEL, "%.*s", name_max, name);
342 else
343 n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name,
344 name_nonce);
345 if (!n)
346 goto out_s;
347
348 a = device_str_attr_create_(n, s);
349 if (!a)
350 goto out_n;
351
352 return a;
353 out_n:
354 kfree(n);
355 out_s:
356 kfree(s);
357 return NULL;
358 }
359
360 static void device_str_attr_destroy(struct attribute *attr)
361 {
362 struct dev_ext_attribute *d;
363
364 d = container_of(attr, struct dev_ext_attribute, attr.attr);
365 kfree(d->var);
366 kfree(d->attr.attr.name);
367 kfree(d);
368 }
369
370 static struct attribute *event_to_attr(unsigned ix,
371 struct hv_24x7_event_data *event,
372 unsigned domain,
373 int nonce)
374 {
375 int event_name_len;
376 char *ev_name, *a_ev_name, *val;
377 const char *ev_suffix;
378 struct attribute *attr;
379
380 if (!domain_is_valid(domain)) {
381 pr_warn("catalog event %u has invalid domain %u\n",
382 ix, domain);
383 return NULL;
384 }
385
386 val = event_fmt(event, domain);
387 if (!val)
388 return NULL;
389
390 ev_suffix = event_domain_suffix(domain);
391 ev_name = event_name(event, &event_name_len);
392 if (!nonce)
393 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s",
394 (int)event_name_len, ev_name, ev_suffix);
395 else
396 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s__%d",
397 (int)event_name_len, ev_name, ev_suffix, nonce);
398
399
400 if (!a_ev_name)
401 goto out_val;
402
403 attr = device_str_attr_create_(a_ev_name, val);
404 if (!attr)
405 goto out_name;
406
407 return attr;
408 out_name:
409 kfree(a_ev_name);
410 out_val:
411 kfree(val);
412 return NULL;
413 }
414
415 static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event,
416 int nonce)
417 {
418 int nl, dl;
419 char *name = event_name(event, &nl);
420 char *desc = event_desc(event, &dl);
421
422 /* If there isn't a description, don't create the sysfs file */
423 if (!dl)
424 return NULL;
425
426 return device_str_attr_create(name, nl, nonce, desc, dl);
427 }
428
429 static struct attribute *
430 event_to_long_desc_attr(struct hv_24x7_event_data *event, int nonce)
431 {
432 int nl, dl;
433 char *name = event_name(event, &nl);
434 char *desc = event_long_desc(event, &dl);
435
436 /* If there isn't a description, don't create the sysfs file */
437 if (!dl)
438 return NULL;
439
440 return device_str_attr_create(name, nl, nonce, desc, dl);
441 }
442
443 static ssize_t event_data_to_attrs(unsigned ix, struct attribute **attrs,
444 struct hv_24x7_event_data *event, int nonce)
445 {
446 unsigned i;
447
448 switch (event->domain) {
449 case HV_PERF_DOMAIN_PHYS_CHIP:
450 *attrs = event_to_attr(ix, event, event->domain, nonce);
451 return 1;
452 case HV_PERF_DOMAIN_PHYS_CORE:
453 for (i = 0; i < ARRAY_SIZE(core_domains); i++) {
454 attrs[i] = event_to_attr(ix, event, core_domains[i],
455 nonce);
456 if (!attrs[i]) {
457 pr_warn("catalog event %u: individual attr %u "
458 "creation failure\n", ix, i);
459 for (; i; i--)
460 device_str_attr_destroy(attrs[i - 1]);
461 return -1;
462 }
463 }
464 return i;
465 default:
466 pr_warn("catalog event %u: domain %u is not allowed in the "
467 "catalog\n", ix, event->domain);
468 return -1;
469 }
470 }
471
472 static size_t event_to_attr_ct(struct hv_24x7_event_data *event)
473 {
474 switch (event->domain) {
475 case HV_PERF_DOMAIN_PHYS_CHIP:
476 return 1;
477 case HV_PERF_DOMAIN_PHYS_CORE:
478 return ARRAY_SIZE(core_domains);
479 default:
480 return 0;
481 }
482 }
483
484 static unsigned long vmalloc_to_phys(void *v)
485 {
486 struct page *p = vmalloc_to_page(v);
487
488 BUG_ON(!p);
489 return page_to_phys(p) + offset_in_page(v);
490 }
491
492 /* */
493 struct event_uniq {
494 struct rb_node node;
495 const char *name;
496 int nl;
497 unsigned ct;
498 unsigned domain;
499 };
500
501 static int memord(const void *d1, size_t s1, const void *d2, size_t s2)
502 {
503 if (s1 < s2)
504 return 1;
505 if (s2 > s1)
506 return -1;
507
508 return memcmp(d1, d2, s1);
509 }
510
511 static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2,
512 size_t s2, unsigned d2)
513 {
514 int r = memord(v1, s1, v2, s2);
515
516 if (r)
517 return r;
518 if (d1 > d2)
519 return 1;
520 if (d2 > d1)
521 return -1;
522 return 0;
523 }
524
525 static int event_uniq_add(struct rb_root *root, const char *name, int nl,
526 unsigned domain)
527 {
528 struct rb_node **new = &(root->rb_node), *parent = NULL;
529 struct event_uniq *data;
530
531 /* Figure out where to put new node */
532 while (*new) {
533 struct event_uniq *it;
534 int result;
535
536 it = container_of(*new, struct event_uniq, node);
537 result = ev_uniq_ord(name, nl, domain, it->name, it->nl,
538 it->domain);
539
540 parent = *new;
541 if (result < 0)
542 new = &((*new)->rb_left);
543 else if (result > 0)
544 new = &((*new)->rb_right);
545 else {
546 it->ct++;
547 pr_info("found a duplicate event %.*s, ct=%u\n", nl,
548 name, it->ct);
549 return it->ct;
550 }
551 }
552
553 data = kmalloc(sizeof(*data), GFP_KERNEL);
554 if (!data)
555 return -ENOMEM;
556
557 *data = (struct event_uniq) {
558 .name = name,
559 .nl = nl,
560 .ct = 0,
561 .domain = domain,
562 };
563
564 /* Add new node and rebalance tree. */
565 rb_link_node(&data->node, parent, new);
566 rb_insert_color(&data->node, root);
567
568 /* data->ct */
569 return 0;
570 }
571
572 static void event_uniq_destroy(struct rb_root *root)
573 {
574 /*
575 * the strings we point to are in the giant block of memory filled by
576 * the catalog, and are freed separately.
577 */
578 struct event_uniq *pos, *n;
579
580 rbtree_postorder_for_each_entry_safe(pos, n, root, node)
581 kfree(pos);
582 }
583
584
585 /*
586 * ensure the event structure's sizes are self consistent and don't cause us to
587 * read outside of the event
588 *
589 * On success, return the event length in bytes.
590 * Otherwise, return -1 (and print as appropriate).
591 */
592 static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
593 size_t event_idx,
594 size_t event_data_bytes,
595 size_t event_entry_count,
596 size_t offset, void *end)
597 {
598 ssize_t ev_len;
599 void *ev_end, *calc_ev_end;
600
601 if (offset >= event_data_bytes)
602 return -1;
603
604 if (event_idx >= event_entry_count) {
605 pr_devel("catalog event data has %zu bytes of padding after last event\n",
606 event_data_bytes - offset);
607 return -1;
608 }
609
610 if (!event_fixed_portion_is_within(event, end)) {
611 pr_warn("event %zu fixed portion is not within range\n",
612 event_idx);
613 return -1;
614 }
615
616 ev_len = be16_to_cpu(event->length);
617
618 if (ev_len % 16)
619 pr_info("event %zu has length %zu not divisible by 16: event=%pK\n",
620 event_idx, ev_len, event);
621
622 ev_end = (__u8 *)event + ev_len;
623 if (ev_end > end) {
624 pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n",
625 event_idx, ev_len, ev_end, end,
626 offset);
627 return -1;
628 }
629
630 calc_ev_end = event_end(event, end);
631 if (!calc_ev_end) {
632 pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n",
633 event_idx, event_data_bytes, event, end,
634 offset);
635 return -1;
636 }
637
638 if (calc_ev_end > ev_end) {
639 pr_warn("event %zu exceeds it's own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n",
640 event_idx, event, ev_end, offset, calc_ev_end);
641 return -1;
642 }
643
644 return ev_len;
645 }
646
647 #define MAX_4K (SIZE_MAX / 4096)
648
649 static void create_events_from_catalog(struct attribute ***events_,
650 struct attribute ***event_descs_,
651 struct attribute ***event_long_descs_)
652 {
653 unsigned long hret;
654 size_t catalog_len, catalog_page_len, event_entry_count,
655 event_data_len, event_data_offs,
656 event_data_bytes, junk_events, event_idx, event_attr_ct, i,
657 attr_max, event_idx_last, desc_ct, long_desc_ct;
658 ssize_t ct, ev_len;
659 uint32_t catalog_version_num;
660 struct attribute **events, **event_descs, **event_long_descs;
661 struct hv_24x7_catalog_page_0 *page_0 =
662 kmem_cache_alloc(hv_page_cache, GFP_KERNEL);
663 void *page = page_0;
664 void *event_data, *end;
665 struct hv_24x7_event_data *event;
666 struct rb_root ev_uniq = RB_ROOT;
667
668 if (!page)
669 goto e_out;
670
671 hret = h_get_24x7_catalog_page(page, 0, 0);
672 if (hret)
673 goto e_free;
674
675 catalog_version_num = be64_to_cpu(page_0->version);
676 catalog_page_len = be32_to_cpu(page_0->length);
677
678 if (MAX_4K < catalog_page_len) {
679 pr_err("invalid page count: %zu\n", catalog_page_len);
680 goto e_free;
681 }
682
683 catalog_len = catalog_page_len * 4096;
684
685 event_entry_count = be16_to_cpu(page_0->event_entry_count);
686 event_data_offs = be16_to_cpu(page_0->event_data_offs);
687 event_data_len = be16_to_cpu(page_0->event_data_len);
688
689 pr_devel("cv %zu cl %zu eec %zu edo %zu edl %zu\n",
690 (size_t)catalog_version_num, catalog_len,
691 event_entry_count, event_data_offs, event_data_len);
692
693 if ((MAX_4K < event_data_len)
694 || (MAX_4K < event_data_offs)
695 || (MAX_4K - event_data_offs < event_data_len)) {
696 pr_err("invalid event data offs %zu and/or len %zu\n",
697 event_data_offs, event_data_len);
698 goto e_free;
699 }
700
701 if ((event_data_offs + event_data_len) > catalog_page_len) {
702 pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n",
703 event_data_offs,
704 event_data_offs + event_data_len,
705 catalog_page_len);
706 goto e_free;
707 }
708
709 if (SIZE_MAX / MAX_EVENTS_PER_EVENT_DATA - 1 < event_entry_count) {
710 pr_err("event_entry_count %zu is invalid\n",
711 event_entry_count);
712 goto e_free;
713 }
714
715 event_data_bytes = event_data_len * 4096;
716
717 /*
718 * event data can span several pages, events can cross between these
719 * pages. Use vmalloc to make this easier.
720 */
721 event_data = vmalloc(event_data_bytes);
722 if (!event_data) {
723 pr_err("could not allocate event data\n");
724 goto e_free;
725 }
726
727 end = event_data + event_data_bytes;
728
729 /*
730 * using vmalloc_to_phys() like this only works if PAGE_SIZE is
731 * divisible by 4096
732 */
733 BUILD_BUG_ON(PAGE_SIZE % 4096);
734
735 for (i = 0; i < event_data_len; i++) {
736 hret = h_get_24x7_catalog_page_(
737 vmalloc_to_phys(event_data + i * 4096),
738 catalog_version_num,
739 i + event_data_offs);
740 if (hret) {
741 pr_err("failed to get event data in page %zu\n",
742 i + event_data_offs);
743 goto e_event_data;
744 }
745 }
746
747 /*
748 * scan the catalog to determine the number of attributes we need, and
749 * verify it at the same time.
750 */
751 for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0;
752 ;
753 event_idx++, event = (void *)event + ev_len) {
754 size_t offset = (void *)event - (void *)event_data;
755 char *name;
756 int nl;
757
758 ev_len = catalog_event_len_validate(event, event_idx,
759 event_data_bytes,
760 event_entry_count,
761 offset, end);
762 if (ev_len < 0)
763 break;
764
765 name = event_name(event, &nl);
766
767 if (event->event_group_record_len == 0) {
768 pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n",
769 event_idx, nl, name);
770 junk_events++;
771 continue;
772 }
773
774 if (!catalog_entry_domain_is_valid(event->domain)) {
775 pr_info("event %zu (%.*s) has invalid domain %d\n",
776 event_idx, nl, name, event->domain);
777 junk_events++;
778 continue;
779 }
780
781 attr_max += event_to_attr_ct(event);
782 }
783
784 event_idx_last = event_idx;
785 if (event_idx_last != event_entry_count)
786 pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n",
787 event_idx_last, event_entry_count, junk_events);
788
789 events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL);
790 if (!events)
791 goto e_event_data;
792
793 event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs),
794 GFP_KERNEL);
795 if (!event_descs)
796 goto e_event_attrs;
797
798 event_long_descs = kmalloc_array(event_idx + 1,
799 sizeof(*event_long_descs), GFP_KERNEL);
800 if (!event_long_descs)
801 goto e_event_descs;
802
803 /* Iterate over the catalog filling in the attribute vector */
804 for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0,
805 event = event_data, event_idx = 0;
806 event_idx < event_idx_last;
807 event_idx++, ev_len = be16_to_cpu(event->length),
808 event = (void *)event + ev_len) {
809 char *name;
810 int nl;
811 int nonce;
812 /*
813 * these are the only "bad" events that are intermixed and that
814 * we can ignore without issue. make sure to skip them here
815 */
816 if (event->event_group_record_len == 0)
817 continue;
818 if (!catalog_entry_domain_is_valid(event->domain))
819 continue;
820
821 name = event_name(event, &nl);
822 nonce = event_uniq_add(&ev_uniq, name, nl, event->domain);
823 ct = event_data_to_attrs(event_idx, events + event_attr_ct,
824 event, nonce);
825 if (ct <= 0) {
826 pr_warn("event %zu (%.*s) creation failure, skipping\n",
827 event_idx, nl, name);
828 junk_events++;
829 } else {
830 event_attr_ct += ct;
831 event_descs[desc_ct] = event_to_desc_attr(event, nonce);
832 if (event_descs[desc_ct])
833 desc_ct++;
834 event_long_descs[long_desc_ct] =
835 event_to_long_desc_attr(event, nonce);
836 if (event_long_descs[long_desc_ct])
837 long_desc_ct++;
838 }
839 }
840
841 pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n",
842 event_idx, event_attr_ct, junk_events, desc_ct);
843
844 events[event_attr_ct] = NULL;
845 event_descs[desc_ct] = NULL;
846 event_long_descs[long_desc_ct] = NULL;
847
848 event_uniq_destroy(&ev_uniq);
849 vfree(event_data);
850 kmem_cache_free(hv_page_cache, page);
851
852 *events_ = events;
853 *event_descs_ = event_descs;
854 *event_long_descs_ = event_long_descs;
855 return;
856
857 e_event_descs:
858 kfree(event_descs);
859 e_event_attrs:
860 kfree(events);
861 e_event_data:
862 vfree(event_data);
863 e_free:
864 kmem_cache_free(hv_page_cache, page);
865 e_out:
866 *events_ = NULL;
867 *event_descs_ = NULL;
868 *event_long_descs_ = NULL;
869 }
870
871 static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
872 struct bin_attribute *bin_attr, char *buf,
873 loff_t offset, size_t count)
874 {
875 unsigned long hret;
876 ssize_t ret = 0;
877 size_t catalog_len = 0, catalog_page_len = 0;
878 loff_t page_offset = 0;
879 loff_t offset_in_page;
880 size_t copy_len;
881 uint64_t catalog_version_num = 0;
882 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER);
883 struct hv_24x7_catalog_page_0 *page_0 = page;
884 if (!page)
885 return -ENOMEM;
886
887 hret = h_get_24x7_catalog_page(page, 0, 0);
888 if (hret) {
889 ret = -EIO;
890 goto e_free;
891 }
892
893 catalog_version_num = be64_to_cpu(page_0->version);
894 catalog_page_len = be32_to_cpu(page_0->length);
895 catalog_len = catalog_page_len * 4096;
896
897 page_offset = offset / 4096;
898 offset_in_page = offset % 4096;
899
900 if (page_offset >= catalog_page_len)
901 goto e_free;
902
903 if (page_offset != 0) {
904 hret = h_get_24x7_catalog_page(page, catalog_version_num,
905 page_offset);
906 if (hret) {
907 ret = -EIO;
908 goto e_free;
909 }
910 }
911
912 copy_len = 4096 - offset_in_page;
913 if (copy_len > count)
914 copy_len = count;
915
916 memcpy(buf, page+offset_in_page, copy_len);
917 ret = copy_len;
918
919 e_free:
920 if (hret)
921 pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:"
922 " rc=%ld\n",
923 catalog_version_num, page_offset, hret);
924 kmem_cache_free(hv_page_cache, page);
925
926 pr_devel("catalog_read: offset=%lld(%lld) count=%zu "
927 "catalog_len=%zu(%zu) => %zd\n", offset, page_offset,
928 count, catalog_len, catalog_page_len, ret);
929
930 return ret;
931 }
932
933 #define PAGE_0_ATTR(_name, _fmt, _expr) \
934 static ssize_t _name##_show(struct device *dev, \
935 struct device_attribute *dev_attr, \
936 char *buf) \
937 { \
938 unsigned long hret; \
939 ssize_t ret = 0; \
940 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \
941 struct hv_24x7_catalog_page_0 *page_0 = page; \
942 if (!page) \
943 return -ENOMEM; \
944 hret = h_get_24x7_catalog_page(page, 0, 0); \
945 if (hret) { \
946 ret = -EIO; \
947 goto e_free; \
948 } \
949 ret = sprintf(buf, _fmt, _expr); \
950 e_free: \
951 kmem_cache_free(hv_page_cache, page); \
952 return ret; \
953 } \
954 static DEVICE_ATTR_RO(_name)
955
956 PAGE_0_ATTR(catalog_version, "%lld\n",
957 (unsigned long long)be64_to_cpu(page_0->version));
958 PAGE_0_ATTR(catalog_len, "%lld\n",
959 (unsigned long long)be32_to_cpu(page_0->length) * 4096);
960 static BIN_ATTR_RO(catalog, 0/* real length varies */);
961
962 static struct bin_attribute *if_bin_attrs[] = {
963 &bin_attr_catalog,
964 NULL,
965 };
966
967 static struct attribute *if_attrs[] = {
968 &dev_attr_catalog_len.attr,
969 &dev_attr_catalog_version.attr,
970 NULL,
971 };
972
973 static struct attribute_group if_group = {
974 .name = "interface",
975 .bin_attrs = if_bin_attrs,
976 .attrs = if_attrs,
977 };
978
979 static const struct attribute_group *attr_groups[] = {
980 &format_group,
981 &event_group,
982 &event_desc_group,
983 &event_long_desc_group,
984 &if_group,
985 NULL,
986 };
987
988 static unsigned long single_24x7_request(struct perf_event *event, u64 *count)
989 {
990 u16 idx;
991 unsigned long ret;
992
993 struct hv_24x7_request_buffer *request_buffer;
994 struct hv_24x7_data_result_buffer *result_buffer;
995 struct hv_24x7_result *resb;
996 struct hv_24x7_request *req;
997
998 BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
999 BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
1000
1001 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1002 result_buffer = (void *)get_cpu_var(hv_24x7_resb);
1003
1004 memset(request_buffer, 0, 4096);
1005 memset(result_buffer, 0, 4096);
1006
1007 if (is_physical_domain(event_get_domain(event)))
1008 idx = event_get_core(event);
1009 else
1010 idx = event_get_vcpu(event);
1011
1012 request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT;
1013 request_buffer->num_requests = 1;
1014
1015 req = &request_buffer->requests[0];
1016
1017 req->performance_domain = event_get_domain(event);
1018 req->data_size = cpu_to_be16(8);
1019 req->data_offset = cpu_to_be32(event_get_offset(event));
1020 req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)),
1021 req->max_num_lpars = cpu_to_be16(1);
1022 req->starting_ix = cpu_to_be16(idx);
1023 req->max_ix = cpu_to_be16(1);
1024
1025 /*
1026 * NOTE: Due to variable number of array elements in request and
1027 * result buffer(s), sizeof() is not reliable. Use the actual
1028 * allocated buffer size, H24x7_DATA_BUFFER_SIZE.
1029 */
1030 ret = plpar_hcall_norets(H_GET_24X7_DATA,
1031 virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE,
1032 virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE);
1033
1034 if (ret) {
1035 pr_devel_ratelimited("hcall failed: %d %#x %#x %d => "
1036 "0x%lx (%ld) detail=0x%x failing ix=%x\n",
1037 req->performance_domain, req->data_offset,
1038 idx, req->starting_lpar_ix, ret, ret,
1039 result_buffer->detailed_rc,
1040 result_buffer->failing_request_ix);
1041 goto out;
1042 }
1043
1044 resb = &result_buffer->results[0];
1045
1046 *count = be64_to_cpu(resb->elements[0].element_data[0]);
1047 out:
1048 return ret;
1049 }
1050
1051
1052 static int h_24x7_event_init(struct perf_event *event)
1053 {
1054 struct hv_perf_caps caps;
1055 unsigned domain;
1056 unsigned long hret;
1057 u64 ct;
1058
1059 /* Not our event */
1060 if (event->attr.type != event->pmu->type)
1061 return -ENOENT;
1062
1063 /* Unused areas must be 0 */
1064 if (event_get_reserved1(event) ||
1065 event_get_reserved2(event) ||
1066 event_get_reserved3(event)) {
1067 pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n",
1068 event->attr.config,
1069 event_get_reserved1(event),
1070 event->attr.config1,
1071 event_get_reserved2(event),
1072 event->attr.config2,
1073 event_get_reserved3(event));
1074 return -EINVAL;
1075 }
1076
1077 /* unsupported modes and filters */
1078 if (event->attr.exclude_user ||
1079 event->attr.exclude_kernel ||
1080 event->attr.exclude_hv ||
1081 event->attr.exclude_idle ||
1082 event->attr.exclude_host ||
1083 event->attr.exclude_guest)
1084 return -EINVAL;
1085
1086 /* no branch sampling */
1087 if (has_branch_stack(event))
1088 return -EOPNOTSUPP;
1089
1090 /* offset must be 8 byte aligned */
1091 if (event_get_offset(event) % 8) {
1092 pr_devel("bad alignment\n");
1093 return -EINVAL;
1094 }
1095
1096 /* Domains above 6 are invalid */
1097 domain = event_get_domain(event);
1098 if (domain > 6) {
1099 pr_devel("invalid domain %d\n", domain);
1100 return -EINVAL;
1101 }
1102
1103 hret = hv_perf_caps_get(&caps);
1104 if (hret) {
1105 pr_devel("could not get capabilities: rc=%ld\n", hret);
1106 return -EIO;
1107 }
1108
1109 /* Physical domains & other lpars require extra capabilities */
1110 if (!caps.collect_privileged && (is_physical_domain(domain) ||
1111 (event_get_lpar(event) != event_get_lpar_max()))) {
1112 pr_devel("hv permisions disallow: is_physical_domain:%d, lpar=0x%llx\n",
1113 is_physical_domain(domain),
1114 event_get_lpar(event));
1115 return -EACCES;
1116 }
1117
1118 /* see if the event complains */
1119 if (single_24x7_request(event, &ct)) {
1120 pr_devel("test hcall failed\n");
1121 return -EIO;
1122 }
1123
1124 return 0;
1125 }
1126
1127 static u64 h_24x7_get_value(struct perf_event *event)
1128 {
1129 unsigned long ret;
1130 u64 ct;
1131 ret = single_24x7_request(event, &ct);
1132 if (ret)
1133 /* We checked this in event init, shouldn't fail here... */
1134 return 0;
1135
1136 return ct;
1137 }
1138
1139 static void h_24x7_event_update(struct perf_event *event)
1140 {
1141 s64 prev;
1142 u64 now;
1143 now = h_24x7_get_value(event);
1144 prev = local64_xchg(&event->hw.prev_count, now);
1145 local64_add(now - prev, &event->count);
1146 }
1147
1148 static void h_24x7_event_start(struct perf_event *event, int flags)
1149 {
1150 if (flags & PERF_EF_RELOAD)
1151 local64_set(&event->hw.prev_count, h_24x7_get_value(event));
1152 }
1153
1154 static void h_24x7_event_stop(struct perf_event *event, int flags)
1155 {
1156 h_24x7_event_update(event);
1157 }
1158
1159 static int h_24x7_event_add(struct perf_event *event, int flags)
1160 {
1161 if (flags & PERF_EF_START)
1162 h_24x7_event_start(event, flags);
1163
1164 return 0;
1165 }
1166
1167 static struct pmu h_24x7_pmu = {
1168 .task_ctx_nr = perf_invalid_context,
1169
1170 .name = "hv_24x7",
1171 .attr_groups = attr_groups,
1172 .event_init = h_24x7_event_init,
1173 .add = h_24x7_event_add,
1174 .del = h_24x7_event_stop,
1175 .start = h_24x7_event_start,
1176 .stop = h_24x7_event_stop,
1177 .read = h_24x7_event_update,
1178 };
1179
1180 static int hv_24x7_init(void)
1181 {
1182 int r;
1183 unsigned long hret;
1184 struct hv_perf_caps caps;
1185
1186 if (!firmware_has_feature(FW_FEATURE_LPAR)) {
1187 pr_debug("not a virtualized system, not enabling\n");
1188 return -ENODEV;
1189 }
1190
1191 hret = hv_perf_caps_get(&caps);
1192 if (hret) {
1193 pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
1194 hret);
1195 return -ENODEV;
1196 }
1197
1198 hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL);
1199 if (!hv_page_cache)
1200 return -ENOMEM;
1201
1202 /* sampling not supported */
1203 h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
1204
1205 create_events_from_catalog(&event_group.attrs,
1206 &event_desc_group.attrs,
1207 &event_long_desc_group.attrs);
1208
1209 r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1);
1210 if (r)
1211 return r;
1212
1213 return 0;
1214 }
1215
1216 device_initcall(hv_24x7_init);
Linux with added FPC-III support