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blk: rq_data_dir() should not return a boolean
[cris-mirror.git] / arch / powerpc / perf / hv-24x7.c
blob527c8b98e97ee5cf8d8564dc166e05e92ac6ee85
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
165 *len = be16_to_cpu(*desc_len) - 2;
166 return (char *)ev->remainder + nl;
167 }
168
169 static char *event_long_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 unsigned desc_len = be16_to_cpu(*desc_len_);
174 __be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2);
175
176 *len = be16_to_cpu(*long_desc_len) - 2;
177 return (char *)ev->remainder + nl + desc_len;
178 }
179
180 static bool event_fixed_portion_is_within(struct hv_24x7_event_data *ev,
181 void *end)
182 {
183 void *start = ev;
184
185 return (start + offsetof(struct hv_24x7_event_data, remainder)) < end;
186 }
187
188 /*
189 * Things we don't check:
190 * - padding for desc, name, and long/detailed desc is required to be '\0'
191 * bytes.
192 *
193 * Return NULL if we pass end,
194 * Otherwise return the address of the byte just following the event.
195 */
196 static void *event_end(struct hv_24x7_event_data *ev, void *end)
197 {
198 void *start = ev;
199 __be16 *dl_, *ldl_;
200 unsigned dl, ldl;
201 unsigned nl = be16_to_cpu(ev->event_name_len);
202
203 if (nl < 2) {
204 pr_debug("%s: name length too short: %d", __func__, nl);
205 return NULL;
206 }
207
208 if (start + nl > end) {
209 pr_debug("%s: start=%p + nl=%u > end=%p",
210 __func__, start, nl, end);
211 return NULL;
212 }
213
214 dl_ = (__be16 *)(ev->remainder + nl - 2);
215 if (!IS_ALIGNED((uintptr_t)dl_, 2))
216 pr_warn("desc len not aligned %p", dl_);
217 dl = be16_to_cpu(*dl_);
218 if (dl < 2) {
219 pr_debug("%s: desc len too short: %d", __func__, dl);
220 return NULL;
221 }
222
223 if (start + nl + dl > end) {
224 pr_debug("%s: (start=%p + nl=%u + dl=%u)=%p > end=%p",
225 __func__, start, nl, dl, start + nl + dl, end);
226 return NULL;
227 }
228
229 ldl_ = (__be16 *)(ev->remainder + nl + dl - 2);
230 if (!IS_ALIGNED((uintptr_t)ldl_, 2))
231 pr_warn("long desc len not aligned %p", ldl_);
232 ldl = be16_to_cpu(*ldl_);
233 if (ldl < 2) {
234 pr_debug("%s: long desc len too short (ldl=%u)",
235 __func__, ldl);
236 return NULL;
237 }
238
239 if (start + nl + dl + ldl > end) {
240 pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p",
241 __func__, start, nl, dl, ldl, end);
242 return NULL;
243 }
244
245 return start + nl + dl + ldl;
246 }
247
248 static unsigned long h_get_24x7_catalog_page_(unsigned long phys_4096,
249 unsigned long version,
250 unsigned long index)
251 {
252 pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)",
253 phys_4096, version, index);
254
255 WARN_ON(!IS_ALIGNED(phys_4096, 4096));
256
257 return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE,
258 phys_4096, version, 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
313 return sprintf(buf, "%s\n", (char *)d->var);
314 }
315
316 static struct attribute *device_str_attr_create_(char *name, char *str)
317 {
318 struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL);
319
320 if (!attr)
321 return NULL;
322
323 sysfs_attr_init(&attr->attr.attr);
324
325 attr->var = str;
326 attr->attr.attr.name = name;
327 attr->attr.attr.mode = 0444;
328 attr->attr.show = device_show_string;
329
330 return &attr->attr.attr;
331 }
332
333 static struct attribute *device_str_attr_create(char *name, int name_max,
334 int name_nonce,
335 char *str, size_t str_max)
336 {
337 char *n;
338 char *s = memdup_to_str(str, str_max, GFP_KERNEL);
339 struct attribute *a;
340
341 if (!s)
342 return NULL;
343
344 if (!name_nonce)
345 n = kasprintf(GFP_KERNEL, "%.*s", name_max, name);
346 else
347 n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name,
348 name_nonce);
349 if (!n)
350 goto out_s;
351
352 a = device_str_attr_create_(n, s);
353 if (!a)
354 goto out_n;
355
356 return a;
357 out_n:
358 kfree(n);
359 out_s:
360 kfree(s);
361 return NULL;
362 }
363
364 static void device_str_attr_destroy(struct attribute *attr)
365 {
366 struct dev_ext_attribute *d;
367
368 d = container_of(attr, struct dev_ext_attribute, attr.attr);
369 kfree(d->var);
370 kfree(d->attr.attr.name);
371 kfree(d);
372 }
373
374 static struct attribute *event_to_attr(unsigned ix,
375 struct hv_24x7_event_data *event,
376 unsigned domain,
377 int nonce)
378 {
379 int event_name_len;
380 char *ev_name, *a_ev_name, *val;
381 const char *ev_suffix;
382 struct attribute *attr;
383
384 if (!domain_is_valid(domain)) {
385 pr_warn("catalog event %u has invalid domain %u\n",
386 ix, domain);
387 return NULL;
388 }
389
390 val = event_fmt(event, domain);
391 if (!val)
392 return NULL;
393
394 ev_suffix = event_domain_suffix(domain);
395 ev_name = event_name(event, &event_name_len);
396 if (!nonce)
397 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s",
398 (int)event_name_len, ev_name, ev_suffix);
399 else
400 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s__%d",
401 (int)event_name_len, ev_name, ev_suffix, nonce);
402
403 if (!a_ev_name)
404 goto out_val;
405
406 attr = device_str_attr_create_(a_ev_name, val);
407 if (!attr)
408 goto out_name;
409
410 return attr;
411 out_name:
412 kfree(a_ev_name);
413 out_val:
414 kfree(val);
415 return NULL;
416 }
417
418 static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event,
419 int nonce)
420 {
421 int nl, dl;
422 char *name = event_name(event, &nl);
423 char *desc = event_desc(event, &dl);
424
425 /* If there isn't a description, don't create the sysfs file */
426 if (!dl)
427 return NULL;
428
429 return device_str_attr_create(name, nl, nonce, desc, dl);
430 }
431
432 static struct attribute *
433 event_to_long_desc_attr(struct hv_24x7_event_data *event, int nonce)
434 {
435 int nl, dl;
436 char *name = event_name(event, &nl);
437 char *desc = event_long_desc(event, &dl);
438
439 /* If there isn't a description, don't create the sysfs file */
440 if (!dl)
441 return NULL;
442
443 return device_str_attr_create(name, nl, nonce, desc, dl);
444 }
445
446 static ssize_t event_data_to_attrs(unsigned ix, struct attribute **attrs,
447 struct hv_24x7_event_data *event, int nonce)
448 {
449 unsigned i;
450
451 switch (event->domain) {
452 case HV_PERF_DOMAIN_PHYS_CHIP:
453 *attrs = event_to_attr(ix, event, event->domain, nonce);
454 return 1;
455 case HV_PERF_DOMAIN_PHYS_CORE:
456 for (i = 0; i < ARRAY_SIZE(core_domains); i++) {
457 attrs[i] = event_to_attr(ix, event, core_domains[i],
458 nonce);
459 if (!attrs[i]) {
460 pr_warn("catalog event %u: individual attr %u "
461 "creation failure\n", ix, i);
462 for (; i; i--)
463 device_str_attr_destroy(attrs[i - 1]);
464 return -1;
465 }
466 }
467 return i;
468 default:
469 pr_warn("catalog event %u: domain %u is not allowed in the "
470 "catalog\n", ix, event->domain);
471 return -1;
472 }
473 }
474
475 static size_t event_to_attr_ct(struct hv_24x7_event_data *event)
476 {
477 switch (event->domain) {
478 case HV_PERF_DOMAIN_PHYS_CHIP:
479 return 1;
480 case HV_PERF_DOMAIN_PHYS_CORE:
481 return ARRAY_SIZE(core_domains);
482 default:
483 return 0;
484 }
485 }
486
487 static unsigned long vmalloc_to_phys(void *v)
488 {
489 struct page *p = vmalloc_to_page(v);
490
491 BUG_ON(!p);
492 return page_to_phys(p) + offset_in_page(v);
493 }
494
495 /* */
496 struct event_uniq {
497 struct rb_node node;
498 const char *name;
499 int nl;
500 unsigned ct;
501 unsigned domain;
502 };
503
504 static int memord(const void *d1, size_t s1, const void *d2, size_t s2)
505 {
506 if (s1 < s2)
507 return 1;
508 if (s2 > s1)
509 return -1;
510
511 return memcmp(d1, d2, s1);
512 }
513
514 static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2,
515 size_t s2, unsigned d2)
516 {
517 int r = memord(v1, s1, v2, s2);
518
519 if (r)
520 return r;
521 if (d1 > d2)
522 return 1;
523 if (d2 > d1)
524 return -1;
525 return 0;
526 }
527
528 static int event_uniq_add(struct rb_root *root, const char *name, int nl,
529 unsigned domain)
530 {
531 struct rb_node **new = &(root->rb_node), *parent = NULL;
532 struct event_uniq *data;
533
534 /* Figure out where to put new node */
535 while (*new) {
536 struct event_uniq *it;
537 int result;
538
539 it = container_of(*new, struct event_uniq, node);
540 result = ev_uniq_ord(name, nl, domain, it->name, it->nl,
541 it->domain);
542
543 parent = *new;
544 if (result < 0)
545 new = &((*new)->rb_left);
546 else if (result > 0)
547 new = &((*new)->rb_right);
548 else {
549 it->ct++;
550 pr_info("found a duplicate event %.*s, ct=%u\n", nl,
551 name, it->ct);
552 return it->ct;
553 }
554 }
555
556 data = kmalloc(sizeof(*data), GFP_KERNEL);
557 if (!data)
558 return -ENOMEM;
559
560 *data = (struct event_uniq) {
561 .name = name,
562 .nl = nl,
563 .ct = 0,
564 .domain = domain,
565 };
566
567 /* Add new node and rebalance tree. */
568 rb_link_node(&data->node, parent, new);
569 rb_insert_color(&data->node, root);
570
571 /* data->ct */
572 return 0;
573 }
574
575 static void event_uniq_destroy(struct rb_root *root)
576 {
577 /*
578 * the strings we point to are in the giant block of memory filled by
579 * the catalog, and are freed separately.
580 */
581 struct event_uniq *pos, *n;
582
583 rbtree_postorder_for_each_entry_safe(pos, n, root, node)
584 kfree(pos);
585 }
586
587
588 /*
589 * ensure the event structure's sizes are self consistent and don't cause us to
590 * read outside of the event
591 *
592 * On success, return the event length in bytes.
593 * Otherwise, return -1 (and print as appropriate).
594 */
595 static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
596 size_t event_idx,
597 size_t event_data_bytes,
598 size_t event_entry_count,
599 size_t offset, void *end)
600 {
601 ssize_t ev_len;
602 void *ev_end, *calc_ev_end;
603
604 if (offset >= event_data_bytes)
605 return -1;
606
607 if (event_idx >= event_entry_count) {
608 pr_devel("catalog event data has %zu bytes of padding after last event\n",
609 event_data_bytes - offset);
610 return -1;
611 }
612
613 if (!event_fixed_portion_is_within(event, end)) {
614 pr_warn("event %zu fixed portion is not within range\n",
615 event_idx);
616 return -1;
617 }
618
619 ev_len = be16_to_cpu(event->length);
620
621 if (ev_len % 16)
622 pr_info("event %zu has length %zu not divisible by 16: event=%pK\n",
623 event_idx, ev_len, event);
624
625 ev_end = (__u8 *)event + ev_len;
626 if (ev_end > end) {
627 pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n",
628 event_idx, ev_len, ev_end, end,
629 offset);
630 return -1;
631 }
632
633 calc_ev_end = event_end(event, end);
634 if (!calc_ev_end) {
635 pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n",
636 event_idx, event_data_bytes, event, end,
637 offset);
638 return -1;
639 }
640
641 if (calc_ev_end > ev_end) {
642 pr_warn("event %zu exceeds it's own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n",
643 event_idx, event, ev_end, offset, calc_ev_end);
644 return -1;
645 }
646
647 return ev_len;
648 }
649
650 #define MAX_4K (SIZE_MAX / 4096)
651
652 static int create_events_from_catalog(struct attribute ***events_,
653 struct attribute ***event_descs_,
654 struct attribute ***event_long_descs_)
655 {
656 unsigned long hret;
657 size_t catalog_len, catalog_page_len, event_entry_count,
658 event_data_len, event_data_offs,
659 event_data_bytes, junk_events, event_idx, event_attr_ct, i,
660 attr_max, event_idx_last, desc_ct, long_desc_ct;
661 ssize_t ct, ev_len;
662 uint32_t catalog_version_num;
663 struct attribute **events, **event_descs, **event_long_descs;
664 struct hv_24x7_catalog_page_0 *page_0 =
665 kmem_cache_alloc(hv_page_cache, GFP_KERNEL);
666 void *page = page_0;
667 void *event_data, *end;
668 struct hv_24x7_event_data *event;
669 struct rb_root ev_uniq = RB_ROOT;
670 int ret = 0;
671
672 if (!page) {
673 ret = -ENOMEM;
674 goto e_out;
675 }
676
677 hret = h_get_24x7_catalog_page(page, 0, 0);
678 if (hret) {
679 ret = -EIO;
680 goto e_free;
681 }
682
683 catalog_version_num = be64_to_cpu(page_0->version);
684 catalog_page_len = be32_to_cpu(page_0->length);
685
686 if (MAX_4K < catalog_page_len) {
687 pr_err("invalid page count: %zu\n", catalog_page_len);
688 ret = -EIO;
689 goto e_free;
690 }
691
692 catalog_len = catalog_page_len * 4096;
693
694 event_entry_count = be16_to_cpu(page_0->event_entry_count);
695 event_data_offs = be16_to_cpu(page_0->event_data_offs);
696 event_data_len = be16_to_cpu(page_0->event_data_len);
697
698 pr_devel("cv %zu cl %zu eec %zu edo %zu edl %zu\n",
699 (size_t)catalog_version_num, catalog_len,
700 event_entry_count, event_data_offs, event_data_len);
701
702 if ((MAX_4K < event_data_len)
703 || (MAX_4K < event_data_offs)
704 || (MAX_4K - event_data_offs < event_data_len)) {
705 pr_err("invalid event data offs %zu and/or len %zu\n",
706 event_data_offs, event_data_len);
707 ret = -EIO;
708 goto e_free;
709 }
710
711 if ((event_data_offs + event_data_len) > catalog_page_len) {
712 pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n",
713 event_data_offs,
714 event_data_offs + event_data_len,
715 catalog_page_len);
716 ret = -EIO;
717 goto e_free;
718 }
719
720 if (SIZE_MAX / MAX_EVENTS_PER_EVENT_DATA - 1 < event_entry_count) {
721 pr_err("event_entry_count %zu is invalid\n",
722 event_entry_count);
723 ret = -EIO;
724 goto e_free;
725 }
726
727 event_data_bytes = event_data_len * 4096;
728
729 /*
730 * event data can span several pages, events can cross between these
731 * pages. Use vmalloc to make this easier.
732 */
733 event_data = vmalloc(event_data_bytes);
734 if (!event_data) {
735 pr_err("could not allocate event data\n");
736 ret = -ENOMEM;
737 goto e_free;
738 }
739
740 end = event_data + event_data_bytes;
741
742 /*
743 * using vmalloc_to_phys() like this only works if PAGE_SIZE is
744 * divisible by 4096
745 */
746 BUILD_BUG_ON(PAGE_SIZE % 4096);
747
748 for (i = 0; i < event_data_len; i++) {
749 hret = h_get_24x7_catalog_page_(
750 vmalloc_to_phys(event_data + i * 4096),
751 catalog_version_num,
752 i + event_data_offs);
753 if (hret) {
754 pr_err("failed to get event data in page %zu\n",
755 i + event_data_offs);
756 ret = -EIO;
757 goto e_event_data;
758 }
759 }
760
761 /*
762 * scan the catalog to determine the number of attributes we need, and
763 * verify it at the same time.
764 */
765 for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0;
766 ;
767 event_idx++, event = (void *)event + ev_len) {
768 size_t offset = (void *)event - (void *)event_data;
769 char *name;
770 int nl;
771
772 ev_len = catalog_event_len_validate(event, event_idx,
773 event_data_bytes,
774 event_entry_count,
775 offset, end);
776 if (ev_len < 0)
777 break;
778
779 name = event_name(event, &nl);
780
781 if (event->event_group_record_len == 0) {
782 pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n",
783 event_idx, nl, name);
784 junk_events++;
785 continue;
786 }
787
788 if (!catalog_entry_domain_is_valid(event->domain)) {
789 pr_info("event %zu (%.*s) has invalid domain %d\n",
790 event_idx, nl, name, event->domain);
791 junk_events++;
792 continue;
793 }
794
795 attr_max += event_to_attr_ct(event);
796 }
797
798 event_idx_last = event_idx;
799 if (event_idx_last != event_entry_count)
800 pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n",
801 event_idx_last, event_entry_count, junk_events);
802
803 events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL);
804 if (!events) {
805 ret = -ENOMEM;
806 goto e_event_data;
807 }
808
809 event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs),
810 GFP_KERNEL);
811 if (!event_descs) {
812 ret = -ENOMEM;
813 goto e_event_attrs;
814 }
815
816 event_long_descs = kmalloc_array(event_idx + 1,
817 sizeof(*event_long_descs), GFP_KERNEL);
818 if (!event_long_descs) {
819 ret = -ENOMEM;
820 goto e_event_descs;
821 }
822
823 /* Iterate over the catalog filling in the attribute vector */
824 for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0,
825 event = event_data, event_idx = 0;
826 event_idx < event_idx_last;
827 event_idx++, ev_len = be16_to_cpu(event->length),
828 event = (void *)event + ev_len) {
829 char *name;
830 int nl;
831 int nonce;
832 /*
833 * these are the only "bad" events that are intermixed and that
834 * we can ignore without issue. make sure to skip them here
835 */
836 if (event->event_group_record_len == 0)
837 continue;
838 if (!catalog_entry_domain_is_valid(event->domain))
839 continue;
840
841 name = event_name(event, &nl);
842 nonce = event_uniq_add(&ev_uniq, name, nl, event->domain);
843 ct = event_data_to_attrs(event_idx, events + event_attr_ct,
844 event, nonce);
845 if (ct <= 0) {
846 pr_warn("event %zu (%.*s) creation failure, skipping\n",
847 event_idx, nl, name);
848 junk_events++;
849 } else {
850 event_attr_ct += ct;
851 event_descs[desc_ct] = event_to_desc_attr(event, nonce);
852 if (event_descs[desc_ct])
853 desc_ct++;
854 event_long_descs[long_desc_ct] =
855 event_to_long_desc_attr(event, nonce);
856 if (event_long_descs[long_desc_ct])
857 long_desc_ct++;
858 }
859 }
860
861 pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n",
862 event_idx, event_attr_ct, junk_events, desc_ct);
863
864 events[event_attr_ct] = NULL;
865 event_descs[desc_ct] = NULL;
866 event_long_descs[long_desc_ct] = NULL;
867
868 event_uniq_destroy(&ev_uniq);
869 vfree(event_data);
870 kmem_cache_free(hv_page_cache, page);
871
872 *events_ = events;
873 *event_descs_ = event_descs;
874 *event_long_descs_ = event_long_descs;
875 return 0;
876
877 e_event_descs:
878 kfree(event_descs);
879 e_event_attrs:
880 kfree(events);
881 e_event_data:
882 vfree(event_data);
883 e_free:
884 kmem_cache_free(hv_page_cache, page);
885 e_out:
886 *events_ = NULL;
887 *event_descs_ = NULL;
888 *event_long_descs_ = NULL;
889 return ret;
890 }
891
892 static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
893 struct bin_attribute *bin_attr, char *buf,
894 loff_t offset, size_t count)
895 {
896 unsigned long hret;
897 ssize_t ret = 0;
898 size_t catalog_len = 0, catalog_page_len = 0;
899 loff_t page_offset = 0;
900 loff_t offset_in_page;
901 size_t copy_len;
902 uint64_t catalog_version_num = 0;
903 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER);
904 struct hv_24x7_catalog_page_0 *page_0 = page;
905
906 if (!page)
907 return -ENOMEM;
908
909 hret = h_get_24x7_catalog_page(page, 0, 0);
910 if (hret) {
911 ret = -EIO;
912 goto e_free;
913 }
914
915 catalog_version_num = be64_to_cpu(page_0->version);
916 catalog_page_len = be32_to_cpu(page_0->length);
917 catalog_len = catalog_page_len * 4096;
918
919 page_offset = offset / 4096;
920 offset_in_page = offset % 4096;
921
922 if (page_offset >= catalog_page_len)
923 goto e_free;
924
925 if (page_offset != 0) {
926 hret = h_get_24x7_catalog_page(page, catalog_version_num,
927 page_offset);
928 if (hret) {
929 ret = -EIO;
930 goto e_free;
931 }
932 }
933
934 copy_len = 4096 - offset_in_page;
935 if (copy_len > count)
936 copy_len = count;
937
938 memcpy(buf, page+offset_in_page, copy_len);
939 ret = copy_len;
940
941 e_free:
942 if (hret)
943 pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:"
944 " rc=%ld\n",
945 catalog_version_num, page_offset, hret);
946 kmem_cache_free(hv_page_cache, page);
947
948 pr_devel("catalog_read: offset=%lld(%lld) count=%zu "
949 "catalog_len=%zu(%zu) => %zd\n", offset, page_offset,
950 count, catalog_len, catalog_page_len, ret);
951
952 return ret;
953 }
954
955 #define PAGE_0_ATTR(_name, _fmt, _expr) \
956 static ssize_t _name##_show(struct device *dev, \
957 struct device_attribute *dev_attr, \
958 char *buf) \
959 { \
960 unsigned long hret; \
961 ssize_t ret = 0; \
962 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \
963 struct hv_24x7_catalog_page_0 *page_0 = page; \
964 if (!page) \
965 return -ENOMEM; \
966 hret = h_get_24x7_catalog_page(page, 0, 0); \
967 if (hret) { \
968 ret = -EIO; \
969 goto e_free; \
970 } \
971 ret = sprintf(buf, _fmt, _expr); \
972 e_free: \
973 kmem_cache_free(hv_page_cache, page); \
974 return ret; \
975 } \
976 static DEVICE_ATTR_RO(_name)
977
978 PAGE_0_ATTR(catalog_version, "%lld\n",
979 (unsigned long long)be64_to_cpu(page_0->version));
980 PAGE_0_ATTR(catalog_len, "%lld\n",
981 (unsigned long long)be32_to_cpu(page_0->length) * 4096);
982 static BIN_ATTR_RO(catalog, 0/* real length varies */);
983
984 static struct bin_attribute *if_bin_attrs[] = {
985 &bin_attr_catalog,
986 NULL,
987 };
988
989 static struct attribute *if_attrs[] = {
990 &dev_attr_catalog_len.attr,
991 &dev_attr_catalog_version.attr,
992 NULL,
993 };
994
995 static struct attribute_group if_group = {
996 .name = "interface",
997 .bin_attrs = if_bin_attrs,
998 .attrs = if_attrs,
999 };
1000
1001 static const struct attribute_group *attr_groups[] = {
1002 &format_group,
1003 &event_group,
1004 &event_desc_group,
1005 &event_long_desc_group,
1006 &if_group,
1007 NULL,
1008 };
1009
1010 static void log_24x7_hcall(struct hv_24x7_request_buffer *request_buffer,
1011 struct hv_24x7_data_result_buffer *result_buffer,
1012 unsigned long ret)
1013 {
1014 struct hv_24x7_request *req;
1015
1016 req = &request_buffer->requests[0];
1017 pr_notice_ratelimited("hcall failed: [%d %#x %#x %d] => "
1018 "ret 0x%lx (%ld) detail=0x%x failing ix=%x\n",
1019 req->performance_domain, req->data_offset,
1020 req->starting_ix, req->starting_lpar_ix, ret, ret,
1021 result_buffer->detailed_rc,
1022 result_buffer->failing_request_ix);
1023 }
1024
1025 /*
1026 * Start the process for a new H_GET_24x7_DATA hcall.
1027 */
1028 static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer,
1029 struct hv_24x7_data_result_buffer *result_buffer)
1030 {
1031
1032 memset(request_buffer, 0, 4096);
1033 memset(result_buffer, 0, 4096);
1034
1035 request_buffer->interface_version = HV_24X7_IF_VERSION_CURRENT;
1036 /* memset above set request_buffer->num_requests to 0 */
1037 }
1038
1039 /*
1040 * Commit (i.e perform) the H_GET_24x7_DATA hcall using the data collected
1041 * by 'init_24x7_request()' and 'add_event_to_24x7_request()'.
1042 */
1043 static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer,
1044 struct hv_24x7_data_result_buffer *result_buffer)
1045 {
1046 unsigned long ret;
1047
1048 /*
1049 * NOTE: Due to variable number of array elements in request and
1050 * result buffer(s), sizeof() is not reliable. Use the actual
1051 * allocated buffer size, H24x7_DATA_BUFFER_SIZE.
1052 */
1053 ret = plpar_hcall_norets(H_GET_24X7_DATA,
1054 virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE,
1055 virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE);
1056
1057 if (ret)
1058 log_24x7_hcall(request_buffer, result_buffer, ret);
1059
1060 return ret;
1061 }
1062
1063 /*
1064 * Add the given @event to the next slot in the 24x7 request_buffer.
1065 *
1066 * Note that H_GET_24X7_DATA hcall allows reading several counters'
1067 * values in a single HCALL. We expect the caller to add events to the
1068 * request buffer one by one, make the HCALL and process the results.
1069 */
1070 static int add_event_to_24x7_request(struct perf_event *event,
1071 struct hv_24x7_request_buffer *request_buffer)
1072 {
1073 u16 idx;
1074 int i;
1075 struct hv_24x7_request *req;
1076
1077 if (request_buffer->num_requests > 254) {
1078 pr_devel("Too many requests for 24x7 HCALL %d\n",
1079 request_buffer->num_requests);
1080 return -EINVAL;
1081 }
1082
1083 if (is_physical_domain(event_get_domain(event)))
1084 idx = event_get_core(event);
1085 else
1086 idx = event_get_vcpu(event);
1087
1088 i = request_buffer->num_requests++;
1089 req = &request_buffer->requests[i];
1090
1091 req->performance_domain = event_get_domain(event);
1092 req->data_size = cpu_to_be16(8);
1093 req->data_offset = cpu_to_be32(event_get_offset(event));
1094 req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)),
1095 req->max_num_lpars = cpu_to_be16(1);
1096 req->starting_ix = cpu_to_be16(idx);
1097 req->max_ix = cpu_to_be16(1);
1098
1099 return 0;
1100 }
1101
1102 static unsigned long single_24x7_request(struct perf_event *event, u64 *count)
1103 {
1104 unsigned long ret;
1105 struct hv_24x7_request_buffer *request_buffer;
1106 struct hv_24x7_data_result_buffer *result_buffer;
1107
1108 BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
1109 BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
1110
1111 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1112 result_buffer = (void *)get_cpu_var(hv_24x7_resb);
1113
1114 init_24x7_request(request_buffer, result_buffer);
1115
1116 ret = add_event_to_24x7_request(event, request_buffer);
1117 if (ret)
1118 goto out;
1119
1120 ret = make_24x7_request(request_buffer, result_buffer);
1121 if (ret) {
1122 log_24x7_hcall(request_buffer, result_buffer, ret);
1123 goto out;
1124 }
1125
1126 /* process result from hcall */
1127 *count = be64_to_cpu(result_buffer->results[0].elements[0].element_data[0]);
1128
1129 out:
1130 put_cpu_var(hv_24x7_reqb);
1131 put_cpu_var(hv_24x7_resb);
1132 return ret;
1133 }
1134
1135
1136 static int h_24x7_event_init(struct perf_event *event)
1137 {
1138 struct hv_perf_caps caps;
1139 unsigned domain;
1140 unsigned long hret;
1141 u64 ct;
1142
1143 /* Not our event */
1144 if (event->attr.type != event->pmu->type)
1145 return -ENOENT;
1146
1147 /* Unused areas must be 0 */
1148 if (event_get_reserved1(event) ||
1149 event_get_reserved2(event) ||
1150 event_get_reserved3(event)) {
1151 pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n",
1152 event->attr.config,
1153 event_get_reserved1(event),
1154 event->attr.config1,
1155 event_get_reserved2(event),
1156 event->attr.config2,
1157 event_get_reserved3(event));
1158 return -EINVAL;
1159 }
1160
1161 /* unsupported modes and filters */
1162 if (event->attr.exclude_user ||
1163 event->attr.exclude_kernel ||
1164 event->attr.exclude_hv ||
1165 event->attr.exclude_idle ||
1166 event->attr.exclude_host ||
1167 event->attr.exclude_guest)
1168 return -EINVAL;
1169
1170 /* no branch sampling */
1171 if (has_branch_stack(event))
1172 return -EOPNOTSUPP;
1173
1174 /* offset must be 8 byte aligned */
1175 if (event_get_offset(event) % 8) {
1176 pr_devel("bad alignment\n");
1177 return -EINVAL;
1178 }
1179
1180 /* Domains above 6 are invalid */
1181 domain = event_get_domain(event);
1182 if (domain > 6) {
1183 pr_devel("invalid domain %d\n", domain);
1184 return -EINVAL;
1185 }
1186
1187 hret = hv_perf_caps_get(&caps);
1188 if (hret) {
1189 pr_devel("could not get capabilities: rc=%ld\n", hret);
1190 return -EIO;
1191 }
1192
1193 /* Physical domains & other lpars require extra capabilities */
1194 if (!caps.collect_privileged && (is_physical_domain(domain) ||
1195 (event_get_lpar(event) != event_get_lpar_max()))) {
1196 pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n",
1197 is_physical_domain(domain),
1198 event_get_lpar(event));
1199 return -EACCES;
1200 }
1201
1202 /* see if the event complains */
1203 if (single_24x7_request(event, &ct)) {
1204 pr_devel("test hcall failed\n");
1205 return -EIO;
1206 }
1207
1208 return 0;
1209 }
1210
1211 static u64 h_24x7_get_value(struct perf_event *event)
1212 {
1213 unsigned long ret;
1214 u64 ct;
1215 ret = single_24x7_request(event, &ct);
1216 if (ret)
1217 /* We checked this in event init, shouldn't fail here... */
1218 return 0;
1219
1220 return ct;
1221 }
1222
1223 static void update_event_count(struct perf_event *event, u64 now)
1224 {
1225 s64 prev;
1226
1227 prev = local64_xchg(&event->hw.prev_count, now);
1228 local64_add(now - prev, &event->count);
1229 }
1230
1231 static void h_24x7_event_read(struct perf_event *event)
1232 {
1233 u64 now;
1234
1235 now = h_24x7_get_value(event);
1236 update_event_count(event, now);
1237 }
1238
1239 static void h_24x7_event_start(struct perf_event *event, int flags)
1240 {
1241 if (flags & PERF_EF_RELOAD)
1242 local64_set(&event->hw.prev_count, h_24x7_get_value(event));
1243 }
1244
1245 static void h_24x7_event_stop(struct perf_event *event, int flags)
1246 {
1247 h_24x7_event_read(event);
1248 }
1249
1250 static int h_24x7_event_add(struct perf_event *event, int flags)
1251 {
1252 if (flags & PERF_EF_START)
1253 h_24x7_event_start(event, flags);
1254
1255 return 0;
1256 }
1257
1258 static struct pmu h_24x7_pmu = {
1259 .task_ctx_nr = perf_invalid_context,
1260
1261 .name = "hv_24x7",
1262 .attr_groups = attr_groups,
1263 .event_init = h_24x7_event_init,
1264 .add = h_24x7_event_add,
1265 .del = h_24x7_event_stop,
1266 .start = h_24x7_event_start,
1267 .stop = h_24x7_event_stop,
1268 .read = h_24x7_event_read,
1269 };
1270
1271 static int hv_24x7_init(void)
1272 {
1273 int r;
1274 unsigned long hret;
1275 struct hv_perf_caps caps;
1276
1277 if (!firmware_has_feature(FW_FEATURE_LPAR)) {
1278 pr_debug("not a virtualized system, not enabling\n");
1279 return -ENODEV;
1280 }
1281
1282 hret = hv_perf_caps_get(&caps);
1283 if (hret) {
1284 pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
1285 hret);
1286 return -ENODEV;
1287 }
1288
1289 hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL);
1290 if (!hv_page_cache)
1291 return -ENOMEM;
1292
1293 /* sampling not supported */
1294 h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
1295
1296 r = create_events_from_catalog(&event_group.attrs,
1297 &event_desc_group.attrs,
1298 &event_long_desc_group.attrs);
1299
1300 if (r)
1301 return r;
1302
1303 r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1);
1304 if (r)
1305 return r;
1306
1307 return 0;
1308 }
1309
1310 device_initcall(hv_24x7_init);
CRIS linux kernel tree