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Merge tag 'jfs-4.1' of git://github.com/kleikamp/linux-shaggy
[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / perf / hv-24x7.c
1 /*
2 * Hypervisor supplied "24x7" performance counter support
3 *
4 * Author: Cody P Schafer <cody@linux.vnet.ibm.com>
5 * Copyright 2014 IBM Corporation.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 #define pr_fmt(fmt) "hv-24x7: " fmt
14
15 #include <linux/perf_event.h>
16 #include <linux/rbtree.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/vmalloc.h>
20
21 #include <asm/firmware.h>
22 #include <asm/hvcall.h>
23 #include <asm/io.h>
24 #include <linux/byteorder/generic.h>
25
26 #include "hv-24x7.h"
27 #include "hv-24x7-catalog.h"
28 #include "hv-common.h"
29
30 static const char *event_domain_suffix(unsigned domain)
31 {
32 switch (domain) {
33 #define DOMAIN(n, v, x, c) \
34 case HV_PERF_DOMAIN_##n: \
35 return "__" #n;
36 #include "hv-24x7-domains.h"
37 #undef DOMAIN
38 default:
39 WARN(1, "unknown domain %d\n", domain);
40 return "__UNKNOWN_DOMAIN_SUFFIX";
41 }
42 }
43
44 static bool domain_is_valid(unsigned domain)
45 {
46 switch (domain) {
47 #define DOMAIN(n, v, x, c) \
48 case HV_PERF_DOMAIN_##n: \
49 /* fall through */
50 #include "hv-24x7-domains.h"
51 #undef DOMAIN
52 return true;
53 default:
54 return false;
55 }
56 }
57
58 static bool is_physical_domain(unsigned domain)
59 {
60 switch (domain) {
61 #define DOMAIN(n, v, x, c) \
62 case HV_PERF_DOMAIN_##n: \
63 return c;
64 #include "hv-24x7-domains.h"
65 #undef DOMAIN
66 default:
67 return false;
68 }
69 }
70
71 static bool catalog_entry_domain_is_valid(unsigned domain)
72 {
73 return is_physical_domain(domain);
74 }
75
76 /*
77 * TODO: Merging events:
78 * - Think of the hcall as an interface to a 4d array of counters:
79 * - x = domains
80 * - y = indexes in the domain (core, chip, vcpu, node, etc)
81 * - z = offset into the counter space
82 * - w = lpars (guest vms, "logical partitions")
83 * - A single request is: x,y,y_last,z,z_last,w,w_last
84 * - this means we can retrieve a rectangle of counters in y,z for a single x.
85 *
86 * - Things to consider (ignoring w):
87 * - input cost_per_request = 16
88 * - output cost_per_result(ys,zs) = 8 + 8 * ys + ys * zs
89 * - limited number of requests per hcall (must fit into 4K bytes)
90 * - 4k = 16 [buffer header] - 16 [request size] * request_count
91 * - 255 requests per hcall
92 * - sometimes it will be more efficient to read extra data and discard
93 */
94
95 /*
96 * Example usage:
97 * perf stat -e 'hv_24x7/domain=2,offset=8,vcpu=0,lpar=0xffffffff/'
98 */
99
100 /* u3 0-6, one of HV_24X7_PERF_DOMAIN */
101 EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3);
102 /* u16 */
103 EVENT_DEFINE_RANGE_FORMAT(core, config, 16, 31);
104 EVENT_DEFINE_RANGE_FORMAT(vcpu, config, 16, 31);
105 /* u32, see "data_offset" */
106 EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63);
107 /* u16 */
108 EVENT_DEFINE_RANGE_FORMAT(lpar, config1, 0, 15);
109
110 EVENT_DEFINE_RANGE(reserved1, config, 4, 15);
111 EVENT_DEFINE_RANGE(reserved2, config1, 16, 63);
112 EVENT_DEFINE_RANGE(reserved3, config2, 0, 63);
113
114 static struct attribute *format_attrs[] = {
115 &format_attr_domain.attr,
116 &format_attr_offset.attr,
117 &format_attr_core.attr,
118 &format_attr_vcpu.attr,
119 &format_attr_lpar.attr,
120 NULL,
121 };
122
123 static struct attribute_group format_group = {
124 .name = "format",
125 .attrs = format_attrs,
126 };
127
128 static struct attribute_group event_group = {
129 .name = "events",
130 /* .attrs is set in init */
131 };
132
133 static struct attribute_group event_desc_group = {
134 .name = "event_descs",
135 /* .attrs is set in init */
136 };
137
138 static struct attribute_group event_long_desc_group = {
139 .name = "event_long_descs",
140 /* .attrs is set in init */
141 };
142
143 static struct kmem_cache *hv_page_cache;
144
145 static char *event_name(struct hv_24x7_event_data *ev, int *len)
146 {
147 *len = be16_to_cpu(ev->event_name_len) - 2;
148 return (char *)ev->remainder;
149 }
150
151 static char *event_desc(struct hv_24x7_event_data *ev, int *len)
152 {
153 unsigned nl = be16_to_cpu(ev->event_name_len);
154 __be16 *desc_len = (__be16 *)(ev->remainder + nl - 2);
155 *len = be16_to_cpu(*desc_len) - 2;
156 return (char *)ev->remainder + nl;
157 }
158
159 static char *event_long_desc(struct hv_24x7_event_data *ev, int *len)
160 {
161 unsigned nl = be16_to_cpu(ev->event_name_len);
162 __be16 *desc_len_ = (__be16 *)(ev->remainder + nl - 2);
163 unsigned desc_len = be16_to_cpu(*desc_len_);
164 __be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2);
165 *len = be16_to_cpu(*long_desc_len) - 2;
166 return (char *)ev->remainder + nl + desc_len;
167 }
168
169 static bool event_fixed_portion_is_within(struct hv_24x7_event_data *ev,
170 void *end)
171 {
172 void *start = ev;
173
174 return (start + offsetof(struct hv_24x7_event_data, remainder)) < end;
175 }
176
177 /*
178 * Things we don't check:
179 * - padding for desc, name, and long/detailed desc is required to be '\0'
180 * bytes.
181 *
182 * Return NULL if we pass end,
183 * Otherwise return the address of the byte just following the event.
184 */
185 static void *event_end(struct hv_24x7_event_data *ev, void *end)
186 {
187 void *start = ev;
188 __be16 *dl_, *ldl_;
189 unsigned dl, ldl;
190 unsigned nl = be16_to_cpu(ev->event_name_len);
191
192 if (nl < 2) {
193 pr_debug("%s: name length too short: %d", __func__, nl);
194 return NULL;
195 }
196
197 if (start + nl > end) {
198 pr_debug("%s: start=%p + nl=%u > end=%p",
199 __func__, start, nl, end);
200 return NULL;
201 }
202
203 dl_ = (__be16 *)(ev->remainder + nl - 2);
204 if (!IS_ALIGNED((uintptr_t)dl_, 2))
205 pr_warn("desc len not aligned %p", dl_);
206 dl = be16_to_cpu(*dl_);
207 if (dl < 2) {
208 pr_debug("%s: desc len too short: %d", __func__, dl);
209 return NULL;
210 }
211
212 if (start + nl + dl > end) {
213 pr_debug("%s: (start=%p + nl=%u + dl=%u)=%p > end=%p",
214 __func__, start, nl, dl, start + nl + dl, end);
215 return NULL;
216 }
217
218 ldl_ = (__be16 *)(ev->remainder + nl + dl - 2);
219 if (!IS_ALIGNED((uintptr_t)ldl_, 2))
220 pr_warn("long desc len not aligned %p", ldl_);
221 ldl = be16_to_cpu(*ldl_);
222 if (ldl < 2) {
223 pr_debug("%s: long desc len too short (ldl=%u)",
224 __func__, ldl);
225 return NULL;
226 }
227
228 if (start + nl + dl + ldl > end) {
229 pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p",
230 __func__, start, nl, dl, ldl, end);
231 return NULL;
232 }
233
234 return start + nl + dl + ldl;
235 }
236
237 static unsigned long h_get_24x7_catalog_page_(unsigned long phys_4096,
238 unsigned long version,
239 unsigned long index)
240 {
241 pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)",
242 phys_4096,
243 version,
244 index);
245 WARN_ON(!IS_ALIGNED(phys_4096, 4096));
246 return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE,
247 phys_4096,
248 version,
249 index);
250 }
251
252 static unsigned long h_get_24x7_catalog_page(char page[],
253 u64 version, u32 index)
254 {
255 return h_get_24x7_catalog_page_(virt_to_phys(page),
256 version, index);
257 }
258
259 static unsigned core_domains[] = {
260 HV_PERF_DOMAIN_PHYS_CORE,
261 HV_PERF_DOMAIN_VCPU_HOME_CORE,
262 HV_PERF_DOMAIN_VCPU_HOME_CHIP,
263 HV_PERF_DOMAIN_VCPU_HOME_NODE,
264 HV_PERF_DOMAIN_VCPU_REMOTE_NODE,
265 };
266 /* chip event data always yeilds a single event, core yeilds multiple */
267 #define MAX_EVENTS_PER_EVENT_DATA ARRAY_SIZE(core_domains)
268
269 static char *event_fmt(struct hv_24x7_event_data *event, unsigned domain)
270 {
271 const char *sindex;
272 const char *lpar;
273
274 if (is_physical_domain(domain)) {
275 lpar = "0x0";
276 sindex = "core";
277 } else {
278 lpar = "?";
279 sindex = "vcpu";
280 }
281
282 return kasprintf(GFP_KERNEL,
283 "domain=0x%x,offset=0x%x,%s=?,lpar=%s",
284 domain,
285 be16_to_cpu(event->event_counter_offs) +
286 be16_to_cpu(event->event_group_record_offs),
287 sindex,
288 lpar);
289 }
290
291 /* Avoid trusting fw to NUL terminate strings */
292 static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp)
293 {
294 return kasprintf(gfp, "%.*s", max_len, maybe_str);
295 }
296
297 static ssize_t device_show_string(struct device *dev,
298 struct device_attribute *attr, char *buf)
299 {
300 struct dev_ext_attribute *d;
301
302 d = container_of(attr, struct dev_ext_attribute, attr);
303 return sprintf(buf, "%s\n", (char *)d->var);
304 }
305
306 static struct attribute *device_str_attr_create_(char *name, char *str)
307 {
308 struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL);
309
310 if (!attr)
311 return NULL;
312
313 attr->var = str;
314 attr->attr.attr.name = name;
315 attr->attr.attr.mode = 0444;
316 attr->attr.show = device_show_string;
317 return &attr->attr.attr;
318 }
319
320 static struct attribute *device_str_attr_create(char *name, int name_max,
321 int name_nonce,
322 char *str, size_t str_max)
323 {
324 char *n;
325 char *s = memdup_to_str(str, str_max, GFP_KERNEL);
326 struct attribute *a;
327
328 if (!s)
329 return NULL;
330
331 if (!name_nonce)
332 n = kasprintf(GFP_KERNEL, "%.*s", name_max, name);
333 else
334 n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name,
335 name_nonce);
336 if (!n)
337 goto out_s;
338
339 a = device_str_attr_create_(n, s);
340 if (!a)
341 goto out_n;
342
343 return a;
344 out_n:
345 kfree(n);
346 out_s:
347 kfree(s);
348 return NULL;
349 }
350
351 static void device_str_attr_destroy(struct attribute *attr)
352 {
353 struct dev_ext_attribute *d;
354
355 d = container_of(attr, struct dev_ext_attribute, attr.attr);
356 kfree(d->var);
357 kfree(d->attr.attr.name);
358 kfree(d);
359 }
360
361 static struct attribute *event_to_attr(unsigned ix,
362 struct hv_24x7_event_data *event,
363 unsigned domain,
364 int nonce)
365 {
366 int event_name_len;
367 char *ev_name, *a_ev_name, *val;
368 const char *ev_suffix;
369 struct attribute *attr;
370
371 if (!domain_is_valid(domain)) {
372 pr_warn("catalog event %u has invalid domain %u\n",
373 ix, domain);
374 return NULL;
375 }
376
377 val = event_fmt(event, domain);
378 if (!val)
379 return NULL;
380
381 ev_suffix = event_domain_suffix(domain);
382 ev_name = event_name(event, &event_name_len);
383 if (!nonce)
384 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s",
385 (int)event_name_len, ev_name, ev_suffix);
386 else
387 a_ev_name = kasprintf(GFP_KERNEL, "%.*s%s__%d",
388 (int)event_name_len, ev_name, ev_suffix, nonce);
389
390
391 if (!a_ev_name)
392 goto out_val;
393
394 attr = device_str_attr_create_(a_ev_name, val);
395 if (!attr)
396 goto out_name;
397
398 return attr;
399 out_name:
400 kfree(a_ev_name);
401 out_val:
402 kfree(val);
403 return NULL;
404 }
405
406 static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event,
407 int nonce)
408 {
409 int nl, dl;
410 char *name = event_name(event, &nl);
411 char *desc = event_desc(event, &dl);
412
413 /* If there isn't a description, don't create the sysfs file */
414 if (!dl)
415 return NULL;
416
417 return device_str_attr_create(name, nl, nonce, desc, dl);
418 }
419
420 static struct attribute *
421 event_to_long_desc_attr(struct hv_24x7_event_data *event, int nonce)
422 {
423 int nl, dl;
424 char *name = event_name(event, &nl);
425 char *desc = event_long_desc(event, &dl);
426
427 /* If there isn't a description, don't create the sysfs file */
428 if (!dl)
429 return NULL;
430
431 return device_str_attr_create(name, nl, nonce, desc, dl);
432 }
433
434 static ssize_t event_data_to_attrs(unsigned ix, struct attribute **attrs,
435 struct hv_24x7_event_data *event, int nonce)
436 {
437 unsigned i;
438
439 switch (event->domain) {
440 case HV_PERF_DOMAIN_PHYS_CHIP:
441 *attrs = event_to_attr(ix, event, event->domain, nonce);
442 return 1;
443 case HV_PERF_DOMAIN_PHYS_CORE:
444 for (i = 0; i < ARRAY_SIZE(core_domains); i++) {
445 attrs[i] = event_to_attr(ix, event, core_domains[i],
446 nonce);
447 if (!attrs[i]) {
448 pr_warn("catalog event %u: individual attr %u "
449 "creation failure\n", ix, i);
450 for (; i; i--)
451 device_str_attr_destroy(attrs[i - 1]);
452 return -1;
453 }
454 }
455 return i;
456 default:
457 pr_warn("catalog event %u: domain %u is not allowed in the "
458 "catalog\n", ix, event->domain);
459 return -1;
460 }
461 }
462
463 static size_t event_to_attr_ct(struct hv_24x7_event_data *event)
464 {
465 switch (event->domain) {
466 case HV_PERF_DOMAIN_PHYS_CHIP:
467 return 1;
468 case HV_PERF_DOMAIN_PHYS_CORE:
469 return ARRAY_SIZE(core_domains);
470 default:
471 return 0;
472 }
473 }
474
475 static unsigned long vmalloc_to_phys(void *v)
476 {
477 struct page *p = vmalloc_to_page(v);
478
479 BUG_ON(!p);
480 return page_to_phys(p) + offset_in_page(v);
481 }
482
483 /* */
484 struct event_uniq {
485 struct rb_node node;
486 const char *name;
487 int nl;
488 unsigned ct;
489 unsigned domain;
490 };
491
492 static int memord(const void *d1, size_t s1, const void *d2, size_t s2)
493 {
494 if (s1 < s2)
495 return 1;
496 if (s2 > s1)
497 return -1;
498
499 return memcmp(d1, d2, s1);
500 }
501
502 static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2,
503 size_t s2, unsigned d2)
504 {
505 int r = memord(v1, s1, v2, s2);
506
507 if (r)
508 return r;
509 if (d1 > d2)
510 return 1;
511 if (d2 > d1)
512 return -1;
513 return 0;
514 }
515
516 static int event_uniq_add(struct rb_root *root, const char *name, int nl,
517 unsigned domain)
518 {
519 struct rb_node **new = &(root->rb_node), *parent = NULL;
520 struct event_uniq *data;
521
522 /* Figure out where to put new node */
523 while (*new) {
524 struct event_uniq *it;
525 int result;
526
527 it = container_of(*new, struct event_uniq, node);
528 result = ev_uniq_ord(name, nl, domain, it->name, it->nl,
529 it->domain);
530
531 parent = *new;
532 if (result < 0)
533 new = &((*new)->rb_left);
534 else if (result > 0)
535 new = &((*new)->rb_right);
536 else {
537 it->ct++;
538 pr_info("found a duplicate event %.*s, ct=%u\n", nl,
539 name, it->ct);
540 return it->ct;
541 }
542 }
543
544 data = kmalloc(sizeof(*data), GFP_KERNEL);
545 if (!data)
546 return -ENOMEM;
547
548 *data = (struct event_uniq) {
549 .name = name,
550 .nl = nl,
551 .ct = 0,
552 .domain = domain,
553 };
554
555 /* Add new node and rebalance tree. */
556 rb_link_node(&data->node, parent, new);
557 rb_insert_color(&data->node, root);
558
559 /* data->ct */
560 return 0;
561 }
562
563 static void event_uniq_destroy(struct rb_root *root)
564 {
565 /*
566 * the strings we point to are in the giant block of memory filled by
567 * the catalog, and are freed separately.
568 */
569 struct event_uniq *pos, *n;
570
571 rbtree_postorder_for_each_entry_safe(pos, n, root, node)
572 kfree(pos);
573 }
574
575
576 /*
577 * ensure the event structure's sizes are self consistent and don't cause us to
578 * read outside of the event
579 *
580 * On success, return the event length in bytes.
581 * Otherwise, return -1 (and print as appropriate).
582 */
583 static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
584 size_t event_idx,
585 size_t event_data_bytes,
586 size_t event_entry_count,
587 size_t offset, void *end)
588 {
589 ssize_t ev_len;
590 void *ev_end, *calc_ev_end;
591
592 if (offset >= event_data_bytes)
593 return -1;
594
595 if (event_idx >= event_entry_count) {
596 pr_devel("catalog event data has %zu bytes of padding after last event\n",
597 event_data_bytes - offset);
598 return -1;
599 }
600
601 if (!event_fixed_portion_is_within(event, end)) {
602 pr_warn("event %zu fixed portion is not within range\n",
603 event_idx);
604 return -1;
605 }
606
607 ev_len = be16_to_cpu(event->length);
608
609 if (ev_len % 16)
610 pr_info("event %zu has length %zu not divisible by 16: event=%pK\n",
611 event_idx, ev_len, event);
612
613 ev_end = (__u8 *)event + ev_len;
614 if (ev_end > end) {
615 pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n",
616 event_idx, ev_len, ev_end, end,
617 offset);
618 return -1;
619 }
620
621 calc_ev_end = event_end(event, end);
622 if (!calc_ev_end) {
623 pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n",
624 event_idx, event_data_bytes, event, end,
625 offset);
626 return -1;
627 }
628
629 if (calc_ev_end > ev_end) {
630 pr_warn("event %zu exceeds it's own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n",
631 event_idx, event, ev_end, offset, calc_ev_end);
632 return -1;
633 }
634
635 return ev_len;
636 }
637
638 #define MAX_4K (SIZE_MAX / 4096)
639
640 static void create_events_from_catalog(struct attribute ***events_,
641 struct attribute ***event_descs_,
642 struct attribute ***event_long_descs_)
643 {
644 unsigned long hret;
645 size_t catalog_len, catalog_page_len, event_entry_count,
646 event_data_len, event_data_offs,
647 event_data_bytes, junk_events, event_idx, event_attr_ct, i,
648 attr_max, event_idx_last, desc_ct, long_desc_ct;
649 ssize_t ct, ev_len;
650 uint32_t catalog_version_num;
651 struct attribute **events, **event_descs, **event_long_descs;
652 struct hv_24x7_catalog_page_0 *page_0 =
653 kmem_cache_alloc(hv_page_cache, GFP_KERNEL);
654 void *page = page_0;
655 void *event_data, *end;
656 struct hv_24x7_event_data *event;
657 struct rb_root ev_uniq = RB_ROOT;
658
659 if (!page)
660 goto e_out;
661
662 hret = h_get_24x7_catalog_page(page, 0, 0);
663 if (hret)
664 goto e_free;
665
666 catalog_version_num = be64_to_cpu(page_0->version);
667 catalog_page_len = be32_to_cpu(page_0->length);
668
669 if (MAX_4K < catalog_page_len) {
670 pr_err("invalid page count: %zu\n", catalog_page_len);
671 goto e_free;
672 }
673
674 catalog_len = catalog_page_len * 4096;
675
676 event_entry_count = be16_to_cpu(page_0->event_entry_count);
677 event_data_offs = be16_to_cpu(page_0->event_data_offs);
678 event_data_len = be16_to_cpu(page_0->event_data_len);
679
680 pr_devel("cv %zu cl %zu eec %zu edo %zu edl %zu\n",
681 (size_t)catalog_version_num, catalog_len,
682 event_entry_count, event_data_offs, event_data_len);
683
684 if ((MAX_4K < event_data_len)
685 || (MAX_4K < event_data_offs)
686 || (MAX_4K - event_data_offs < event_data_len)) {
687 pr_err("invalid event data offs %zu and/or len %zu\n",
688 event_data_offs, event_data_len);
689 goto e_free;
690 }
691
692 if ((event_data_offs + event_data_len) > catalog_page_len) {
693 pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n",
694 event_data_offs,
695 event_data_offs + event_data_len,
696 catalog_page_len);
697 goto e_free;
698 }
699
700 if (SIZE_MAX / MAX_EVENTS_PER_EVENT_DATA - 1 < event_entry_count) {
701 pr_err("event_entry_count %zu is invalid\n",
702 event_entry_count);
703 goto e_free;
704 }
705
706 event_data_bytes = event_data_len * 4096;
707
708 /*
709 * event data can span several pages, events can cross between these
710 * pages. Use vmalloc to make this easier.
711 */
712 event_data = vmalloc(event_data_bytes);
713 if (!event_data) {
714 pr_err("could not allocate event data\n");
715 goto e_free;
716 }
717
718 end = event_data + event_data_bytes;
719
720 /*
721 * using vmalloc_to_phys() like this only works if PAGE_SIZE is
722 * divisible by 4096
723 */
724 BUILD_BUG_ON(PAGE_SIZE % 4096);
725
726 for (i = 0; i < event_data_len; i++) {
727 hret = h_get_24x7_catalog_page_(
728 vmalloc_to_phys(event_data + i * 4096),
729 catalog_version_num,
730 i + event_data_offs);
731 if (hret) {
732 pr_err("failed to get event data in page %zu\n",
733 i + event_data_offs);
734 goto e_event_data;
735 }
736 }
737
738 /*
739 * scan the catalog to determine the number of attributes we need, and
740 * verify it at the same time.
741 */
742 for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0;
743 ;
744 event_idx++, event = (void *)event + ev_len) {
745 size_t offset = (void *)event - (void *)event_data;
746 char *name;
747 int nl;
748
749 ev_len = catalog_event_len_validate(event, event_idx,
750 event_data_bytes,
751 event_entry_count,
752 offset, end);
753 if (ev_len < 0)
754 break;
755
756 name = event_name(event, &nl);
757
758 if (event->event_group_record_len == 0) {
759 pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n",
760 event_idx, nl, name);
761 junk_events++;
762 continue;
763 }
764
765 if (!catalog_entry_domain_is_valid(event->domain)) {
766 pr_info("event %zu (%.*s) has invalid domain %d\n",
767 event_idx, nl, name, event->domain);
768 junk_events++;
769 continue;
770 }
771
772 attr_max += event_to_attr_ct(event);
773 }
774
775 event_idx_last = event_idx;
776 if (event_idx_last != event_entry_count)
777 pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n",
778 event_idx_last, event_entry_count, junk_events);
779
780 events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL);
781 if (!events)
782 goto e_event_data;
783
784 event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs),
785 GFP_KERNEL);
786 if (!event_descs)
787 goto e_event_attrs;
788
789 event_long_descs = kmalloc_array(event_idx + 1,
790 sizeof(*event_long_descs), GFP_KERNEL);
791 if (!event_long_descs)
792 goto e_event_descs;
793
794 /* Iterate over the catalog filling in the attribute vector */
795 for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0,
796 event = event_data, event_idx = 0;
797 event_idx < event_idx_last;
798 event_idx++, ev_len = be16_to_cpu(event->length),
799 event = (void *)event + ev_len) {
800 char *name;
801 int nl;
802 int nonce;
803 /*
804 * these are the only "bad" events that are intermixed and that
805 * we can ignore without issue. make sure to skip them here
806 */
807 if (event->event_group_record_len == 0)
808 continue;
809 if (!catalog_entry_domain_is_valid(event->domain))
810 continue;
811
812 name = event_name(event, &nl);
813 nonce = event_uniq_add(&ev_uniq, name, nl, event->domain);
814 ct = event_data_to_attrs(event_idx, events + event_attr_ct,
815 event, nonce);
816 if (ct <= 0) {
817 pr_warn("event %zu (%.*s) creation failure, skipping\n",
818 event_idx, nl, name);
819 junk_events++;
820 } else {
821 event_attr_ct += ct;
822 event_descs[desc_ct] = event_to_desc_attr(event, nonce);
823 if (event_descs[desc_ct])
824 desc_ct++;
825 event_long_descs[long_desc_ct] =
826 event_to_long_desc_attr(event, nonce);
827 if (event_long_descs[long_desc_ct])
828 long_desc_ct++;
829 }
830 }
831
832 pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n",
833 event_idx, event_attr_ct, junk_events, desc_ct);
834
835 events[event_attr_ct] = NULL;
836 event_descs[desc_ct] = NULL;
837 event_long_descs[long_desc_ct] = NULL;
838
839 event_uniq_destroy(&ev_uniq);
840 vfree(event_data);
841 kmem_cache_free(hv_page_cache, page);
842
843 *events_ = events;
844 *event_descs_ = event_descs;
845 *event_long_descs_ = event_long_descs;
846 return;
847
848 e_event_descs:
849 kfree(event_descs);
850 e_event_attrs:
851 kfree(events);
852 e_event_data:
853 vfree(event_data);
854 e_free:
855 kmem_cache_free(hv_page_cache, page);
856 e_out:
857 *events_ = NULL;
858 *event_descs_ = NULL;
859 *event_long_descs_ = NULL;
860 }
861
862 static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
863 struct bin_attribute *bin_attr, char *buf,
864 loff_t offset, size_t count)
865 {
866 unsigned long hret;
867 ssize_t ret = 0;
868 size_t catalog_len = 0, catalog_page_len = 0;
869 loff_t page_offset = 0;
870 loff_t offset_in_page;
871 size_t copy_len;
872 uint64_t catalog_version_num = 0;
873 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER);
874 struct hv_24x7_catalog_page_0 *page_0 = page;
875 if (!page)
876 return -ENOMEM;
877
878 hret = h_get_24x7_catalog_page(page, 0, 0);
879 if (hret) {
880 ret = -EIO;
881 goto e_free;
882 }
883
884 catalog_version_num = be64_to_cpu(page_0->version);
885 catalog_page_len = be32_to_cpu(page_0->length);
886 catalog_len = catalog_page_len * 4096;
887
888 page_offset = offset / 4096;
889 offset_in_page = offset % 4096;
890
891 if (page_offset >= catalog_page_len)
892 goto e_free;
893
894 if (page_offset != 0) {
895 hret = h_get_24x7_catalog_page(page, catalog_version_num,
896 page_offset);
897 if (hret) {
898 ret = -EIO;
899 goto e_free;
900 }
901 }
902
903 copy_len = 4096 - offset_in_page;
904 if (copy_len > count)
905 copy_len = count;
906
907 memcpy(buf, page+offset_in_page, copy_len);
908 ret = copy_len;
909
910 e_free:
911 if (hret)
912 pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:"
913 " rc=%ld\n",
914 catalog_version_num, page_offset, hret);
915 kmem_cache_free(hv_page_cache, page);
916
917 pr_devel("catalog_read: offset=%lld(%lld) count=%zu "
918 "catalog_len=%zu(%zu) => %zd\n", offset, page_offset,
919 count, catalog_len, catalog_page_len, ret);
920
921 return ret;
922 }
923
924 #define PAGE_0_ATTR(_name, _fmt, _expr) \
925 static ssize_t _name##_show(struct device *dev, \
926 struct device_attribute *dev_attr, \
927 char *buf) \
928 { \
929 unsigned long hret; \
930 ssize_t ret = 0; \
931 void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \
932 struct hv_24x7_catalog_page_0 *page_0 = page; \
933 if (!page) \
934 return -ENOMEM; \
935 hret = h_get_24x7_catalog_page(page, 0, 0); \
936 if (hret) { \
937 ret = -EIO; \
938 goto e_free; \
939 } \
940 ret = sprintf(buf, _fmt, _expr); \
941 e_free: \
942 kmem_cache_free(hv_page_cache, page); \
943 return ret; \
944 } \
945 static DEVICE_ATTR_RO(_name)
946
947 PAGE_0_ATTR(catalog_version, "%lld\n",
948 (unsigned long long)be64_to_cpu(page_0->version));
949 PAGE_0_ATTR(catalog_len, "%lld\n",
950 (unsigned long long)be32_to_cpu(page_0->length) * 4096);
951 static BIN_ATTR_RO(catalog, 0/* real length varies */);
952
953 static struct bin_attribute *if_bin_attrs[] = {
954 &bin_attr_catalog,
955 NULL,
956 };
957
958 static struct attribute *if_attrs[] = {
959 &dev_attr_catalog_len.attr,
960 &dev_attr_catalog_version.attr,
961 NULL,
962 };
963
964 static struct attribute_group if_group = {
965 .name = "interface",
966 .bin_attrs = if_bin_attrs,
967 .attrs = if_attrs,
968 };
969
970 static const struct attribute_group *attr_groups[] = {
971 &format_group,
972 &event_group,
973 &event_desc_group,
974 &event_long_desc_group,
975 &if_group,
976 NULL,
977 };
978
979 DEFINE_PER_CPU(char, hv_24x7_reqb[4096]) __aligned(4096);
980 DEFINE_PER_CPU(char, hv_24x7_resb[4096]) __aligned(4096);
981
982 static unsigned long single_24x7_request(u8 domain, u32 offset, u16 ix,
983 u16 lpar, u64 *res,
984 bool success_expected)
985 {
986 unsigned long ret;
987
988 /*
989 * request_buffer and result_buffer are not required to be 4k aligned,
990 * but are not allowed to cross any 4k boundary. Aligning them to 4k is
991 * the simplest way to ensure that.
992 */
993 struct reqb {
994 struct hv_24x7_request_buffer buf;
995 struct hv_24x7_request req;
996 } __packed *request_buffer;
997
998 struct {
999 struct hv_24x7_data_result_buffer buf;
1000 struct hv_24x7_result res;
1001 struct hv_24x7_result_element elem;
1002 __be64 result;
1003 } __packed *result_buffer;
1004
1005 BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
1006 BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
1007
1008 request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
1009 result_buffer = (void *)get_cpu_var(hv_24x7_resb);
1010
1011 memset(request_buffer, 0, 4096);
1012 memset(result_buffer, 0, 4096);
1013
1014 *request_buffer = (struct reqb) {
1015 .buf = {
1016 .interface_version = HV_24X7_IF_VERSION_CURRENT,
1017 .num_requests = 1,
1018 },
1019 .req = {
1020 .performance_domain = domain,
1021 .data_size = cpu_to_be16(8),
1022 .data_offset = cpu_to_be32(offset),
1023 .starting_lpar_ix = cpu_to_be16(lpar),
1024 .max_num_lpars = cpu_to_be16(1),
1025 .starting_ix = cpu_to_be16(ix),
1026 .max_ix = cpu_to_be16(1),
1027 }
1028 };
1029
1030 ret = plpar_hcall_norets(H_GET_24X7_DATA,
1031 virt_to_phys(request_buffer), sizeof(*request_buffer),
1032 virt_to_phys(result_buffer), sizeof(*result_buffer));
1033
1034 if (ret) {
1035 if (success_expected)
1036 pr_err_ratelimited("hcall failed: %d %#x %#x %d => "
1037 "0x%lx (%ld) detail=0x%x failing ix=%x\n",
1038 domain, offset, ix, lpar, ret, ret,
1039 result_buffer->buf.detailed_rc,
1040 result_buffer->buf.failing_request_ix);
1041 goto out;
1042 }
1043
1044 *res = be64_to_cpu(result_buffer->result);
1045
1046 out:
1047 return ret;
1048 }
1049
1050 static unsigned long event_24x7_request(struct perf_event *event, u64 *res,
1051 bool success_expected)
1052 {
1053 u16 idx;
1054 unsigned domain = event_get_domain(event);
1055
1056 if (is_physical_domain(domain))
1057 idx = event_get_core(event);
1058 else
1059 idx = event_get_vcpu(event);
1060
1061 return single_24x7_request(event_get_domain(event),
1062 event_get_offset(event),
1063 idx,
1064 event_get_lpar(event),
1065 res,
1066 success_expected);
1067 }
1068
1069 static int h_24x7_event_init(struct perf_event *event)
1070 {
1071 struct hv_perf_caps caps;
1072 unsigned domain;
1073 unsigned long hret;
1074 u64 ct;
1075
1076 /* Not our event */
1077 if (event->attr.type != event->pmu->type)
1078 return -ENOENT;
1079
1080 /* Unused areas must be 0 */
1081 if (event_get_reserved1(event) ||
1082 event_get_reserved2(event) ||
1083 event_get_reserved3(event)) {
1084 pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n",
1085 event->attr.config,
1086 event_get_reserved1(event),
1087 event->attr.config1,
1088 event_get_reserved2(event),
1089 event->attr.config2,
1090 event_get_reserved3(event));
1091 return -EINVAL;
1092 }
1093
1094 /* unsupported modes and filters */
1095 if (event->attr.exclude_user ||
1096 event->attr.exclude_kernel ||
1097 event->attr.exclude_hv ||
1098 event->attr.exclude_idle ||
1099 event->attr.exclude_host ||
1100 event->attr.exclude_guest)
1101 return -EINVAL;
1102
1103 /* no branch sampling */
1104 if (has_branch_stack(event))
1105 return -EOPNOTSUPP;
1106
1107 /* offset must be 8 byte aligned */
1108 if (event_get_offset(event) % 8) {
1109 pr_devel("bad alignment\n");
1110 return -EINVAL;
1111 }
1112
1113 /* Domains above 6 are invalid */
1114 domain = event_get_domain(event);
1115 if (domain > 6) {
1116 pr_devel("invalid domain %d\n", domain);
1117 return -EINVAL;
1118 }
1119
1120 hret = hv_perf_caps_get(&caps);
1121 if (hret) {
1122 pr_devel("could not get capabilities: rc=%ld\n", hret);
1123 return -EIO;
1124 }
1125
1126 /* Physical domains & other lpars require extra capabilities */
1127 if (!caps.collect_privileged && (is_physical_domain(domain) ||
1128 (event_get_lpar(event) != event_get_lpar_max()))) {
1129 pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n",
1130 is_physical_domain(domain),
1131 event_get_lpar(event));
1132 return -EACCES;
1133 }
1134
1135 /* see if the event complains */
1136 if (event_24x7_request(event, &ct, false)) {
1137 pr_devel("test hcall failed\n");
1138 return -EIO;
1139 }
1140
1141 return 0;
1142 }
1143
1144 static u64 h_24x7_get_value(struct perf_event *event)
1145 {
1146 unsigned long ret;
1147 u64 ct;
1148 ret = event_24x7_request(event, &ct, true);
1149 if (ret)
1150 /* We checked this in event init, shouldn't fail here... */
1151 return 0;
1152
1153 return ct;
1154 }
1155
1156 static void h_24x7_event_update(struct perf_event *event)
1157 {
1158 s64 prev;
1159 u64 now;
1160 now = h_24x7_get_value(event);
1161 prev = local64_xchg(&event->hw.prev_count, now);
1162 local64_add(now - prev, &event->count);
1163 }
1164
1165 static void h_24x7_event_start(struct perf_event *event, int flags)
1166 {
1167 if (flags & PERF_EF_RELOAD)
1168 local64_set(&event->hw.prev_count, h_24x7_get_value(event));
1169 }
1170
1171 static void h_24x7_event_stop(struct perf_event *event, int flags)
1172 {
1173 h_24x7_event_update(event);
1174 }
1175
1176 static int h_24x7_event_add(struct perf_event *event, int flags)
1177 {
1178 if (flags & PERF_EF_START)
1179 h_24x7_event_start(event, flags);
1180
1181 return 0;
1182 }
1183
1184 static struct pmu h_24x7_pmu = {
1185 .task_ctx_nr = perf_invalid_context,
1186
1187 .name = "hv_24x7",
1188 .attr_groups = attr_groups,
1189 .event_init = h_24x7_event_init,
1190 .add = h_24x7_event_add,
1191 .del = h_24x7_event_stop,
1192 .start = h_24x7_event_start,
1193 .stop = h_24x7_event_stop,
1194 .read = h_24x7_event_update,
1195 };
1196
1197 static int hv_24x7_init(void)
1198 {
1199 int r;
1200 unsigned long hret;
1201 struct hv_perf_caps caps;
1202
1203 if (!firmware_has_feature(FW_FEATURE_LPAR)) {
1204 pr_debug("not a virtualized system, not enabling\n");
1205 return -ENODEV;
1206 }
1207
1208 hret = hv_perf_caps_get(&caps);
1209 if (hret) {
1210 pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
1211 hret);
1212 return -ENODEV;
1213 }
1214
1215 hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL);
1216 if (!hv_page_cache)
1217 return -ENOMEM;
1218
1219 /* sampling not supported */
1220 h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
1221
1222 create_events_from_catalog(&event_group.attrs,
1223 &event_desc_group.attrs,
1224 &event_long_desc_group.attrs);
1225
1226 r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1);
1227 if (r)
1228 return r;
1229
1230 return 0;
1231 }
1232
1233 device_initcall(hv_24x7_init);
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