Commit | Line | Data |
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0e93a6ed CS |
1 | /* |
2 | * Hypervisor supplied "24x7" performance counter support | |
3 | * | |
4 | * Author: Cody P Schafer <cody@linux.vnet.ibm.com> | |
5 | * Copyright 2014 IBM Corporation. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #define pr_fmt(fmt) "hv-24x7: " fmt | |
14 | ||
15 | #include <linux/perf_event.h> | |
5c5cd7b5 | 16 | #include <linux/rbtree.h> |
0e93a6ed CS |
17 | #include <linux/module.h> |
18 | #include <linux/slab.h> | |
5c5cd7b5 CS |
19 | #include <linux/vmalloc.h> |
20 | ||
2e6553aa | 21 | #include <asm/cputhreads.h> |
0e93a6ed CS |
22 | #include <asm/firmware.h> |
23 | #include <asm/hvcall.h> | |
24 | #include <asm/io.h> | |
5c5cd7b5 | 25 | #include <linux/byteorder/generic.h> |
0e93a6ed CS |
26 | |
27 | #include "hv-24x7.h" | |
28 | #include "hv-24x7-catalog.h" | |
29 | #include "hv-common.h" | |
30 | ||
2e6553aa TJB |
31 | /* Version of the 24x7 hypervisor API that we should use in this machine. */ |
32 | static int interface_version; | |
33 | ||
bfaa7834 TJB |
34 | /* Whether we have to aggregate result data for some domains. */ |
35 | static bool aggregate_result_elements; | |
36 | ||
5c5cd7b5 CS |
37 | static bool domain_is_valid(unsigned domain) |
38 | { | |
39 | switch (domain) { | |
40 | #define DOMAIN(n, v, x, c) \ | |
41 | case HV_PERF_DOMAIN_##n: \ | |
42 | /* fall through */ | |
43 | #include "hv-24x7-domains.h" | |
44 | #undef DOMAIN | |
45 | return true; | |
46 | default: | |
47 | return false; | |
48 | } | |
49 | } | |
50 | ||
51 | static bool is_physical_domain(unsigned domain) | |
52 | { | |
53 | switch (domain) { | |
54 | #define DOMAIN(n, v, x, c) \ | |
55 | case HV_PERF_DOMAIN_##n: \ | |
56 | return c; | |
57 | #include "hv-24x7-domains.h" | |
58 | #undef DOMAIN | |
59 | default: | |
60 | return false; | |
61 | } | |
62 | } | |
63 | ||
bfaa7834 TJB |
64 | /* Domains for which more than one result element are returned for each event. */ |
65 | static bool domain_needs_aggregation(unsigned int domain) | |
66 | { | |
67 | return aggregate_result_elements && | |
68 | (domain == HV_PERF_DOMAIN_PHYS_CORE || | |
69 | (domain >= HV_PERF_DOMAIN_VCPU_HOME_CORE && | |
70 | domain <= HV_PERF_DOMAIN_VCPU_REMOTE_NODE)); | |
71 | } | |
72 | ||
d34171e8 SB |
73 | static const char *domain_name(unsigned domain) |
74 | { | |
75 | if (!domain_is_valid(domain)) | |
76 | return NULL; | |
77 | ||
78 | switch (domain) { | |
79 | case HV_PERF_DOMAIN_PHYS_CHIP: return "Physical Chip"; | |
80 | case HV_PERF_DOMAIN_PHYS_CORE: return "Physical Core"; | |
81 | case HV_PERF_DOMAIN_VCPU_HOME_CORE: return "VCPU Home Core"; | |
82 | case HV_PERF_DOMAIN_VCPU_HOME_CHIP: return "VCPU Home Chip"; | |
83 | case HV_PERF_DOMAIN_VCPU_HOME_NODE: return "VCPU Home Node"; | |
84 | case HV_PERF_DOMAIN_VCPU_REMOTE_NODE: return "VCPU Remote Node"; | |
85 | } | |
86 | ||
87 | WARN_ON_ONCE(domain); | |
88 | return NULL; | |
89 | } | |
90 | ||
5c5cd7b5 CS |
91 | static bool catalog_entry_domain_is_valid(unsigned domain) |
92 | { | |
2e6553aa TJB |
93 | /* POWER8 doesn't support virtual domains. */ |
94 | if (interface_version == 1) | |
95 | return is_physical_domain(domain); | |
96 | else | |
97 | return domain_is_valid(domain); | |
5c5cd7b5 CS |
98 | } |
99 | ||
0e93a6ed CS |
100 | /* |
101 | * TODO: Merging events: | |
102 | * - Think of the hcall as an interface to a 4d array of counters: | |
103 | * - x = domains | |
104 | * - y = indexes in the domain (core, chip, vcpu, node, etc) | |
105 | * - z = offset into the counter space | |
106 | * - w = lpars (guest vms, "logical partitions") | |
107 | * - A single request is: x,y,y_last,z,z_last,w,w_last | |
108 | * - this means we can retrieve a rectangle of counters in y,z for a single x. | |
109 | * | |
110 | * - Things to consider (ignoring w): | |
111 | * - input cost_per_request = 16 | |
112 | * - output cost_per_result(ys,zs) = 8 + 8 * ys + ys * zs | |
113 | * - limited number of requests per hcall (must fit into 4K bytes) | |
114 | * - 4k = 16 [buffer header] - 16 [request size] * request_count | |
115 | * - 255 requests per hcall | |
116 | * - sometimes it will be more efficient to read extra data and discard | |
117 | */ | |
118 | ||
119 | /* | |
120 | * Example usage: | |
5c5cd7b5 | 121 | * perf stat -e 'hv_24x7/domain=2,offset=8,vcpu=0,lpar=0xffffffff/' |
0e93a6ed CS |
122 | */ |
123 | ||
124 | /* u3 0-6, one of HV_24X7_PERF_DOMAIN */ | |
125 | EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3); | |
126 | /* u16 */ | |
5c5cd7b5 | 127 | EVENT_DEFINE_RANGE_FORMAT(core, config, 16, 31); |
e5a5886d | 128 | EVENT_DEFINE_RANGE_FORMAT(chip, config, 16, 31); |
5c5cd7b5 | 129 | EVENT_DEFINE_RANGE_FORMAT(vcpu, config, 16, 31); |
0e93a6ed CS |
130 | /* u32, see "data_offset" */ |
131 | EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63); | |
132 | /* u16 */ | |
133 | EVENT_DEFINE_RANGE_FORMAT(lpar, config1, 0, 15); | |
134 | ||
135 | EVENT_DEFINE_RANGE(reserved1, config, 4, 15); | |
136 | EVENT_DEFINE_RANGE(reserved2, config1, 16, 63); | |
137 | EVENT_DEFINE_RANGE(reserved3, config2, 0, 63); | |
138 | ||
139 | static struct attribute *format_attrs[] = { | |
140 | &format_attr_domain.attr, | |
141 | &format_attr_offset.attr, | |
5c5cd7b5 | 142 | &format_attr_core.attr, |
e5a5886d | 143 | &format_attr_chip.attr, |
5c5cd7b5 | 144 | &format_attr_vcpu.attr, |
0e93a6ed CS |
145 | &format_attr_lpar.attr, |
146 | NULL, | |
147 | }; | |
148 | ||
149 | static struct attribute_group format_group = { | |
150 | .name = "format", | |
151 | .attrs = format_attrs, | |
152 | }; | |
153 | ||
5c5cd7b5 CS |
154 | static struct attribute_group event_group = { |
155 | .name = "events", | |
156 | /* .attrs is set in init */ | |
157 | }; | |
158 | ||
159 | static struct attribute_group event_desc_group = { | |
160 | .name = "event_descs", | |
161 | /* .attrs is set in init */ | |
162 | }; | |
163 | ||
164 | static struct attribute_group event_long_desc_group = { | |
165 | .name = "event_long_descs", | |
166 | /* .attrs is set in init */ | |
167 | }; | |
168 | ||
0e93a6ed CS |
169 | static struct kmem_cache *hv_page_cache; |
170 | ||
88a48613 SB |
171 | DEFINE_PER_CPU(int, hv_24x7_txn_flags); |
172 | DEFINE_PER_CPU(int, hv_24x7_txn_err); | |
173 | ||
174 | struct hv_24x7_hw { | |
175 | struct perf_event *events[255]; | |
176 | }; | |
177 | ||
178 | DEFINE_PER_CPU(struct hv_24x7_hw, hv_24x7_hw); | |
179 | ||
145264e2 SB |
180 | /* |
181 | * request_buffer and result_buffer are not required to be 4k aligned, | |
182 | * but are not allowed to cross any 4k boundary. Aligning them to 4k is | |
183 | * the simplest way to ensure that. | |
184 | */ | |
185 | #define H24x7_DATA_BUFFER_SIZE 4096 | |
186 | DEFINE_PER_CPU(char, hv_24x7_reqb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096); | |
187 | DEFINE_PER_CPU(char, hv_24x7_resb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096); | |
188 | ||
2e6553aa TJB |
189 | static unsigned int max_num_requests(int interface_version) |
190 | { | |
191 | return (H24x7_DATA_BUFFER_SIZE - sizeof(struct hv_24x7_request_buffer)) | |
192 | / H24x7_REQUEST_SIZE(interface_version); | |
193 | } | |
36c8fb2c | 194 | |
5c5cd7b5 CS |
195 | static char *event_name(struct hv_24x7_event_data *ev, int *len) |
196 | { | |
197 | *len = be16_to_cpu(ev->event_name_len) - 2; | |
198 | return (char *)ev->remainder; | |
199 | } | |
200 | ||
201 | static char *event_desc(struct hv_24x7_event_data *ev, int *len) | |
202 | { | |
203 | unsigned nl = be16_to_cpu(ev->event_name_len); | |
204 | __be16 *desc_len = (__be16 *)(ev->remainder + nl - 2); | |
3ca4ea71 | 205 | |
5c5cd7b5 CS |
206 | *len = be16_to_cpu(*desc_len) - 2; |
207 | return (char *)ev->remainder + nl; | |
208 | } | |
209 | ||
210 | static char *event_long_desc(struct hv_24x7_event_data *ev, int *len) | |
211 | { | |
212 | unsigned nl = be16_to_cpu(ev->event_name_len); | |
213 | __be16 *desc_len_ = (__be16 *)(ev->remainder + nl - 2); | |
214 | unsigned desc_len = be16_to_cpu(*desc_len_); | |
215 | __be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2); | |
3ca4ea71 | 216 | |
5c5cd7b5 CS |
217 | *len = be16_to_cpu(*long_desc_len) - 2; |
218 | return (char *)ev->remainder + nl + desc_len; | |
219 | } | |
220 | ||
221 | static bool event_fixed_portion_is_within(struct hv_24x7_event_data *ev, | |
222 | void *end) | |
223 | { | |
224 | void *start = ev; | |
225 | ||
226 | return (start + offsetof(struct hv_24x7_event_data, remainder)) < end; | |
227 | } | |
228 | ||
229 | /* | |
230 | * Things we don't check: | |
231 | * - padding for desc, name, and long/detailed desc is required to be '\0' | |
232 | * bytes. | |
233 | * | |
234 | * Return NULL if we pass end, | |
235 | * Otherwise return the address of the byte just following the event. | |
236 | */ | |
237 | static void *event_end(struct hv_24x7_event_data *ev, void *end) | |
238 | { | |
239 | void *start = ev; | |
240 | __be16 *dl_, *ldl_; | |
241 | unsigned dl, ldl; | |
242 | unsigned nl = be16_to_cpu(ev->event_name_len); | |
243 | ||
244 | if (nl < 2) { | |
245 | pr_debug("%s: name length too short: %d", __func__, nl); | |
246 | return NULL; | |
247 | } | |
248 | ||
249 | if (start + nl > end) { | |
250 | pr_debug("%s: start=%p + nl=%u > end=%p", | |
251 | __func__, start, nl, end); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | dl_ = (__be16 *)(ev->remainder + nl - 2); | |
256 | if (!IS_ALIGNED((uintptr_t)dl_, 2)) | |
257 | pr_warn("desc len not aligned %p", dl_); | |
258 | dl = be16_to_cpu(*dl_); | |
259 | if (dl < 2) { | |
260 | pr_debug("%s: desc len too short: %d", __func__, dl); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | if (start + nl + dl > end) { | |
265 | pr_debug("%s: (start=%p + nl=%u + dl=%u)=%p > end=%p", | |
266 | __func__, start, nl, dl, start + nl + dl, end); | |
267 | return NULL; | |
268 | } | |
269 | ||
270 | ldl_ = (__be16 *)(ev->remainder + nl + dl - 2); | |
271 | if (!IS_ALIGNED((uintptr_t)ldl_, 2)) | |
272 | pr_warn("long desc len not aligned %p", ldl_); | |
273 | ldl = be16_to_cpu(*ldl_); | |
274 | if (ldl < 2) { | |
275 | pr_debug("%s: long desc len too short (ldl=%u)", | |
276 | __func__, ldl); | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | if (start + nl + dl + ldl > end) { | |
281 | pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p", | |
282 | __func__, start, nl, dl, ldl, end); | |
283 | return NULL; | |
284 | } | |
285 | ||
286 | return start + nl + dl + ldl; | |
287 | } | |
288 | ||
38d81846 TJB |
289 | static long h_get_24x7_catalog_page_(unsigned long phys_4096, |
290 | unsigned long version, unsigned long index) | |
0e93a6ed | 291 | { |
78d13166 | 292 | pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)", |
3ca4ea71 SB |
293 | phys_4096, version, index); |
294 | ||
78d13166 | 295 | WARN_ON(!IS_ALIGNED(phys_4096, 4096)); |
3ca4ea71 | 296 | |
0e93a6ed | 297 | return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE, |
3ca4ea71 | 298 | phys_4096, version, index); |
0e93a6ed CS |
299 | } |
300 | ||
38d81846 | 301 | static long h_get_24x7_catalog_page(char page[], u64 version, u32 index) |
78d13166 CS |
302 | { |
303 | return h_get_24x7_catalog_page_(virt_to_phys(page), | |
304 | version, index); | |
305 | } | |
306 | ||
8f69dc70 SB |
307 | /* |
308 | * Each event we find in the catalog, will have a sysfs entry. Format the | |
309 | * data for this sysfs entry based on the event's domain. | |
310 | * | |
311 | * Events belonging to the Chip domain can only be monitored in that domain. | |
312 | * i.e the domain for these events is a fixed/knwon value. | |
313 | * | |
314 | * Events belonging to the Core domain can be monitored either in the physical | |
315 | * core or in one of the virtual CPU domains. So the domain value for these | |
316 | * events must be specified by the user (i.e is a required parameter). Format | |
317 | * the Core events with 'domain=?' so the perf-tool can error check required | |
318 | * parameters. | |
319 | * | |
320 | * NOTE: For the Core domain events, rather than making domain a required | |
321 | * parameter we could default it to PHYS_CORE and allowe users to | |
322 | * override the domain to one of the VCPU domains. | |
323 | * | |
324 | * However, this can make the interface a little inconsistent. | |
325 | * | |
326 | * If we set domain=2 (PHYS_CHIP) and allow user to override this field | |
327 | * the user may be tempted to also modify the "offset=x" field in which | |
328 | * can lead to confusing usage. Consider the HPM_PCYC (offset=0x18) and | |
329 | * HPM_INST (offset=0x20) events. With: | |
330 | * | |
331 | * perf stat -e hv_24x7/HPM_PCYC,offset=0x20/ | |
332 | * | |
333 | * we end up monitoring HPM_INST, while the command line has HPM_PCYC. | |
334 | * | |
335 | * By not assigning a default value to the domain for the Core events, | |
336 | * we can have simple guidelines: | |
337 | * | |
338 | * - Specifying values for parameters with "=?" is required. | |
339 | * | |
340 | * - Specifying (i.e overriding) values for other parameters | |
341 | * is undefined. | |
342 | */ | |
5c5cd7b5 CS |
343 | static char *event_fmt(struct hv_24x7_event_data *event, unsigned domain) |
344 | { | |
345 | const char *sindex; | |
346 | const char *lpar; | |
8f69dc70 SB |
347 | const char *domain_str; |
348 | char buf[8]; | |
5c5cd7b5 | 349 | |
e5a5886d SB |
350 | switch (domain) { |
351 | case HV_PERF_DOMAIN_PHYS_CHIP: | |
8f69dc70 SB |
352 | snprintf(buf, sizeof(buf), "%d", domain); |
353 | domain_str = buf; | |
e5a5886d SB |
354 | lpar = "0x0"; |
355 | sindex = "chip"; | |
356 | break; | |
357 | case HV_PERF_DOMAIN_PHYS_CORE: | |
8f69dc70 | 358 | domain_str = "?"; |
5c5cd7b5 CS |
359 | lpar = "0x0"; |
360 | sindex = "core"; | |
e5a5886d SB |
361 | break; |
362 | default: | |
8f69dc70 | 363 | domain_str = "?"; |
5c5cd7b5 CS |
364 | lpar = "?"; |
365 | sindex = "vcpu"; | |
366 | } | |
367 | ||
368 | return kasprintf(GFP_KERNEL, | |
8f69dc70 SB |
369 | "domain=%s,offset=0x%x,%s=?,lpar=%s", |
370 | domain_str, | |
5c5cd7b5 CS |
371 | be16_to_cpu(event->event_counter_offs) + |
372 | be16_to_cpu(event->event_group_record_offs), | |
373 | sindex, | |
374 | lpar); | |
375 | } | |
376 | ||
377 | /* Avoid trusting fw to NUL terminate strings */ | |
378 | static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp) | |
379 | { | |
380 | return kasprintf(gfp, "%.*s", max_len, maybe_str); | |
381 | } | |
382 | ||
383 | static ssize_t device_show_string(struct device *dev, | |
384 | struct device_attribute *attr, char *buf) | |
385 | { | |
386 | struct dev_ext_attribute *d; | |
387 | ||
388 | d = container_of(attr, struct dev_ext_attribute, attr); | |
3ca4ea71 | 389 | |
5c5cd7b5 CS |
390 | return sprintf(buf, "%s\n", (char *)d->var); |
391 | } | |
392 | ||
393 | static struct attribute *device_str_attr_create_(char *name, char *str) | |
394 | { | |
395 | struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
396 | ||
397 | if (!attr) | |
398 | return NULL; | |
399 | ||
442053e5 SB |
400 | sysfs_attr_init(&attr->attr.attr); |
401 | ||
5c5cd7b5 CS |
402 | attr->var = str; |
403 | attr->attr.attr.name = name; | |
404 | attr->attr.attr.mode = 0444; | |
405 | attr->attr.show = device_show_string; | |
3ca4ea71 | 406 | |
5c5cd7b5 CS |
407 | return &attr->attr.attr; |
408 | } | |
409 | ||
8f69dc70 SB |
410 | /* |
411 | * Allocate and initialize strings representing event attributes. | |
412 | * | |
413 | * NOTE: The strings allocated here are never destroyed and continue to | |
414 | * exist till shutdown. This is to allow us to create as many events | |
415 | * from the catalog as possible, even if we encounter errors with some. | |
416 | * In case of changes to error paths in future, these may need to be | |
417 | * freed by the caller. | |
418 | */ | |
5c5cd7b5 CS |
419 | static struct attribute *device_str_attr_create(char *name, int name_max, |
420 | int name_nonce, | |
421 | char *str, size_t str_max) | |
422 | { | |
423 | char *n; | |
424 | char *s = memdup_to_str(str, str_max, GFP_KERNEL); | |
425 | struct attribute *a; | |
426 | ||
427 | if (!s) | |
428 | return NULL; | |
429 | ||
430 | if (!name_nonce) | |
431 | n = kasprintf(GFP_KERNEL, "%.*s", name_max, name); | |
432 | else | |
433 | n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name, | |
434 | name_nonce); | |
435 | if (!n) | |
436 | goto out_s; | |
437 | ||
438 | a = device_str_attr_create_(n, s); | |
439 | if (!a) | |
440 | goto out_n; | |
441 | ||
442 | return a; | |
443 | out_n: | |
444 | kfree(n); | |
445 | out_s: | |
446 | kfree(s); | |
447 | return NULL; | |
448 | } | |
449 | ||
5c5cd7b5 CS |
450 | static struct attribute *event_to_attr(unsigned ix, |
451 | struct hv_24x7_event_data *event, | |
452 | unsigned domain, | |
453 | int nonce) | |
454 | { | |
455 | int event_name_len; | |
456 | char *ev_name, *a_ev_name, *val; | |
5c5cd7b5 CS |
457 | struct attribute *attr; |
458 | ||
459 | if (!domain_is_valid(domain)) { | |
460 | pr_warn("catalog event %u has invalid domain %u\n", | |
461 | ix, domain); | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | val = event_fmt(event, domain); | |
466 | if (!val) | |
467 | return NULL; | |
468 | ||
5c5cd7b5 CS |
469 | ev_name = event_name(event, &event_name_len); |
470 | if (!nonce) | |
8f69dc70 SB |
471 | a_ev_name = kasprintf(GFP_KERNEL, "%.*s", |
472 | (int)event_name_len, ev_name); | |
5c5cd7b5 | 473 | else |
8f69dc70 SB |
474 | a_ev_name = kasprintf(GFP_KERNEL, "%.*s__%d", |
475 | (int)event_name_len, ev_name, nonce); | |
5c5cd7b5 | 476 | |
5c5cd7b5 CS |
477 | if (!a_ev_name) |
478 | goto out_val; | |
479 | ||
480 | attr = device_str_attr_create_(a_ev_name, val); | |
481 | if (!attr) | |
482 | goto out_name; | |
483 | ||
484 | return attr; | |
485 | out_name: | |
486 | kfree(a_ev_name); | |
487 | out_val: | |
488 | kfree(val); | |
489 | return NULL; | |
490 | } | |
491 | ||
492 | static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event, | |
40386217 | 493 | int nonce) |
5c5cd7b5 CS |
494 | { |
495 | int nl, dl; | |
496 | char *name = event_name(event, &nl); | |
497 | char *desc = event_desc(event, &dl); | |
498 | ||
499 | /* If there isn't a description, don't create the sysfs file */ | |
500 | if (!dl) | |
501 | return NULL; | |
502 | ||
503 | return device_str_attr_create(name, nl, nonce, desc, dl); | |
504 | } | |
505 | ||
506 | static struct attribute * | |
507 | event_to_long_desc_attr(struct hv_24x7_event_data *event, int nonce) | |
508 | { | |
509 | int nl, dl; | |
510 | char *name = event_name(event, &nl); | |
511 | char *desc = event_long_desc(event, &dl); | |
512 | ||
513 | /* If there isn't a description, don't create the sysfs file */ | |
514 | if (!dl) | |
515 | return NULL; | |
516 | ||
517 | return device_str_attr_create(name, nl, nonce, desc, dl); | |
518 | } | |
519 | ||
8f69dc70 | 520 | static int event_data_to_attrs(unsigned ix, struct attribute **attrs, |
40386217 | 521 | struct hv_24x7_event_data *event, int nonce) |
5c5cd7b5 | 522 | { |
8f69dc70 SB |
523 | *attrs = event_to_attr(ix, event, event->domain, nonce); |
524 | if (!*attrs) | |
5c5cd7b5 | 525 | return -1; |
5c5cd7b5 | 526 | |
8f69dc70 | 527 | return 0; |
5c5cd7b5 CS |
528 | } |
529 | ||
5c5cd7b5 CS |
530 | /* */ |
531 | struct event_uniq { | |
532 | struct rb_node node; | |
533 | const char *name; | |
534 | int nl; | |
535 | unsigned ct; | |
536 | unsigned domain; | |
537 | }; | |
538 | ||
539 | static int memord(const void *d1, size_t s1, const void *d2, size_t s2) | |
540 | { | |
541 | if (s1 < s2) | |
542 | return 1; | |
05c14c03 | 543 | if (s1 > s2) |
5c5cd7b5 CS |
544 | return -1; |
545 | ||
546 | return memcmp(d1, d2, s1); | |
547 | } | |
548 | ||
549 | static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2, | |
40386217 | 550 | size_t s2, unsigned d2) |
5c5cd7b5 CS |
551 | { |
552 | int r = memord(v1, s1, v2, s2); | |
553 | ||
554 | if (r) | |
555 | return r; | |
556 | if (d1 > d2) | |
557 | return 1; | |
558 | if (d2 > d1) | |
559 | return -1; | |
560 | return 0; | |
561 | } | |
562 | ||
563 | static int event_uniq_add(struct rb_root *root, const char *name, int nl, | |
40386217 | 564 | unsigned domain) |
5c5cd7b5 CS |
565 | { |
566 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
567 | struct event_uniq *data; | |
568 | ||
569 | /* Figure out where to put new node */ | |
570 | while (*new) { | |
571 | struct event_uniq *it; | |
572 | int result; | |
573 | ||
574 | it = container_of(*new, struct event_uniq, node); | |
575 | result = ev_uniq_ord(name, nl, domain, it->name, it->nl, | |
576 | it->domain); | |
577 | ||
578 | parent = *new; | |
579 | if (result < 0) | |
580 | new = &((*new)->rb_left); | |
581 | else if (result > 0) | |
582 | new = &((*new)->rb_right); | |
583 | else { | |
584 | it->ct++; | |
585 | pr_info("found a duplicate event %.*s, ct=%u\n", nl, | |
586 | name, it->ct); | |
587 | return it->ct; | |
588 | } | |
589 | } | |
590 | ||
591 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
592 | if (!data) | |
593 | return -ENOMEM; | |
594 | ||
595 | *data = (struct event_uniq) { | |
596 | .name = name, | |
597 | .nl = nl, | |
598 | .ct = 0, | |
599 | .domain = domain, | |
600 | }; | |
601 | ||
602 | /* Add new node and rebalance tree. */ | |
603 | rb_link_node(&data->node, parent, new); | |
604 | rb_insert_color(&data->node, root); | |
605 | ||
606 | /* data->ct */ | |
607 | return 0; | |
608 | } | |
609 | ||
610 | static void event_uniq_destroy(struct rb_root *root) | |
611 | { | |
612 | /* | |
613 | * the strings we point to are in the giant block of memory filled by | |
614 | * the catalog, and are freed separately. | |
615 | */ | |
616 | struct event_uniq *pos, *n; | |
617 | ||
618 | rbtree_postorder_for_each_entry_safe(pos, n, root, node) | |
619 | kfree(pos); | |
620 | } | |
621 | ||
622 | ||
623 | /* | |
624 | * ensure the event structure's sizes are self consistent and don't cause us to | |
625 | * read outside of the event | |
626 | * | |
627 | * On success, return the event length in bytes. | |
628 | * Otherwise, return -1 (and print as appropriate). | |
629 | */ | |
630 | static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event, | |
631 | size_t event_idx, | |
632 | size_t event_data_bytes, | |
633 | size_t event_entry_count, | |
634 | size_t offset, void *end) | |
635 | { | |
636 | ssize_t ev_len; | |
637 | void *ev_end, *calc_ev_end; | |
638 | ||
639 | if (offset >= event_data_bytes) | |
640 | return -1; | |
641 | ||
642 | if (event_idx >= event_entry_count) { | |
643 | pr_devel("catalog event data has %zu bytes of padding after last event\n", | |
644 | event_data_bytes - offset); | |
645 | return -1; | |
646 | } | |
647 | ||
648 | if (!event_fixed_portion_is_within(event, end)) { | |
649 | pr_warn("event %zu fixed portion is not within range\n", | |
650 | event_idx); | |
651 | return -1; | |
652 | } | |
653 | ||
654 | ev_len = be16_to_cpu(event->length); | |
655 | ||
656 | if (ev_len % 16) | |
657 | pr_info("event %zu has length %zu not divisible by 16: event=%pK\n", | |
658 | event_idx, ev_len, event); | |
659 | ||
660 | ev_end = (__u8 *)event + ev_len; | |
661 | if (ev_end > end) { | |
662 | pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n", | |
663 | event_idx, ev_len, ev_end, end, | |
664 | offset); | |
665 | return -1; | |
666 | } | |
667 | ||
668 | calc_ev_end = event_end(event, end); | |
669 | if (!calc_ev_end) { | |
670 | pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n", | |
671 | event_idx, event_data_bytes, event, end, | |
672 | offset); | |
673 | return -1; | |
674 | } | |
675 | ||
676 | if (calc_ev_end > ev_end) { | |
677 | pr_warn("event %zu exceeds it's own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n", | |
678 | event_idx, event, ev_end, offset, calc_ev_end); | |
679 | return -1; | |
680 | } | |
681 | ||
682 | return ev_len; | |
683 | } | |
684 | ||
685 | #define MAX_4K (SIZE_MAX / 4096) | |
686 | ||
7debc970 | 687 | static int create_events_from_catalog(struct attribute ***events_, |
40386217 SB |
688 | struct attribute ***event_descs_, |
689 | struct attribute ***event_long_descs_) | |
5c5cd7b5 | 690 | { |
38d81846 | 691 | long hret; |
5c5cd7b5 CS |
692 | size_t catalog_len, catalog_page_len, event_entry_count, |
693 | event_data_len, event_data_offs, | |
694 | event_data_bytes, junk_events, event_idx, event_attr_ct, i, | |
695 | attr_max, event_idx_last, desc_ct, long_desc_ct; | |
696 | ssize_t ct, ev_len; | |
12bf85a7 | 697 | uint64_t catalog_version_num; |
5c5cd7b5 CS |
698 | struct attribute **events, **event_descs, **event_long_descs; |
699 | struct hv_24x7_catalog_page_0 *page_0 = | |
700 | kmem_cache_alloc(hv_page_cache, GFP_KERNEL); | |
701 | void *page = page_0; | |
702 | void *event_data, *end; | |
703 | struct hv_24x7_event_data *event; | |
704 | struct rb_root ev_uniq = RB_ROOT; | |
7debc970 | 705 | int ret = 0; |
5c5cd7b5 | 706 | |
7debc970 LZ |
707 | if (!page) { |
708 | ret = -ENOMEM; | |
5c5cd7b5 | 709 | goto e_out; |
7debc970 | 710 | } |
5c5cd7b5 CS |
711 | |
712 | hret = h_get_24x7_catalog_page(page, 0, 0); | |
7debc970 LZ |
713 | if (hret) { |
714 | ret = -EIO; | |
5c5cd7b5 | 715 | goto e_free; |
7debc970 | 716 | } |
5c5cd7b5 CS |
717 | |
718 | catalog_version_num = be64_to_cpu(page_0->version); | |
719 | catalog_page_len = be32_to_cpu(page_0->length); | |
720 | ||
721 | if (MAX_4K < catalog_page_len) { | |
722 | pr_err("invalid page count: %zu\n", catalog_page_len); | |
7debc970 | 723 | ret = -EIO; |
5c5cd7b5 CS |
724 | goto e_free; |
725 | } | |
726 | ||
727 | catalog_len = catalog_page_len * 4096; | |
728 | ||
729 | event_entry_count = be16_to_cpu(page_0->event_entry_count); | |
730 | event_data_offs = be16_to_cpu(page_0->event_data_offs); | |
731 | event_data_len = be16_to_cpu(page_0->event_data_len); | |
732 | ||
12bf85a7 TJB |
733 | pr_devel("cv %llu cl %zu eec %zu edo %zu edl %zu\n", |
734 | catalog_version_num, catalog_len, | |
5c5cd7b5 CS |
735 | event_entry_count, event_data_offs, event_data_len); |
736 | ||
737 | if ((MAX_4K < event_data_len) | |
738 | || (MAX_4K < event_data_offs) | |
739 | || (MAX_4K - event_data_offs < event_data_len)) { | |
740 | pr_err("invalid event data offs %zu and/or len %zu\n", | |
741 | event_data_offs, event_data_len); | |
7debc970 | 742 | ret = -EIO; |
5c5cd7b5 CS |
743 | goto e_free; |
744 | } | |
745 | ||
746 | if ((event_data_offs + event_data_len) > catalog_page_len) { | |
747 | pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n", | |
748 | event_data_offs, | |
749 | event_data_offs + event_data_len, | |
750 | catalog_page_len); | |
7debc970 | 751 | ret = -EIO; |
5c5cd7b5 CS |
752 | goto e_free; |
753 | } | |
754 | ||
8f69dc70 SB |
755 | if (SIZE_MAX - 1 < event_entry_count) { |
756 | pr_err("event_entry_count %zu is invalid\n", event_entry_count); | |
7debc970 | 757 | ret = -EIO; |
5c5cd7b5 CS |
758 | goto e_free; |
759 | } | |
760 | ||
761 | event_data_bytes = event_data_len * 4096; | |
762 | ||
763 | /* | |
764 | * event data can span several pages, events can cross between these | |
765 | * pages. Use vmalloc to make this easier. | |
766 | */ | |
767 | event_data = vmalloc(event_data_bytes); | |
768 | if (!event_data) { | |
769 | pr_err("could not allocate event data\n"); | |
7debc970 | 770 | ret = -ENOMEM; |
5c5cd7b5 CS |
771 | goto e_free; |
772 | } | |
773 | ||
774 | end = event_data + event_data_bytes; | |
775 | ||
776 | /* | |
777 | * using vmalloc_to_phys() like this only works if PAGE_SIZE is | |
778 | * divisible by 4096 | |
779 | */ | |
780 | BUILD_BUG_ON(PAGE_SIZE % 4096); | |
781 | ||
782 | for (i = 0; i < event_data_len; i++) { | |
783 | hret = h_get_24x7_catalog_page_( | |
784 | vmalloc_to_phys(event_data + i * 4096), | |
785 | catalog_version_num, | |
786 | i + event_data_offs); | |
787 | if (hret) { | |
12bf85a7 TJB |
788 | pr_err("Failed to get event data in page %zu: rc=%ld\n", |
789 | i + event_data_offs, hret); | |
7debc970 | 790 | ret = -EIO; |
5c5cd7b5 CS |
791 | goto e_event_data; |
792 | } | |
793 | } | |
794 | ||
795 | /* | |
796 | * scan the catalog to determine the number of attributes we need, and | |
797 | * verify it at the same time. | |
798 | */ | |
799 | for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0; | |
800 | ; | |
801 | event_idx++, event = (void *)event + ev_len) { | |
802 | size_t offset = (void *)event - (void *)event_data; | |
803 | char *name; | |
804 | int nl; | |
805 | ||
806 | ev_len = catalog_event_len_validate(event, event_idx, | |
807 | event_data_bytes, | |
808 | event_entry_count, | |
809 | offset, end); | |
810 | if (ev_len < 0) | |
811 | break; | |
812 | ||
813 | name = event_name(event, &nl); | |
814 | ||
815 | if (event->event_group_record_len == 0) { | |
816 | pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n", | |
817 | event_idx, nl, name); | |
818 | junk_events++; | |
819 | continue; | |
820 | } | |
821 | ||
822 | if (!catalog_entry_domain_is_valid(event->domain)) { | |
823 | pr_info("event %zu (%.*s) has invalid domain %d\n", | |
824 | event_idx, nl, name, event->domain); | |
825 | junk_events++; | |
826 | continue; | |
827 | } | |
828 | ||
8f69dc70 | 829 | attr_max++; |
5c5cd7b5 CS |
830 | } |
831 | ||
832 | event_idx_last = event_idx; | |
833 | if (event_idx_last != event_entry_count) | |
834 | pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n", | |
835 | event_idx_last, event_entry_count, junk_events); | |
836 | ||
837 | events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL); | |
7debc970 LZ |
838 | if (!events) { |
839 | ret = -ENOMEM; | |
5c5cd7b5 | 840 | goto e_event_data; |
7debc970 | 841 | } |
5c5cd7b5 CS |
842 | |
843 | event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs), | |
844 | GFP_KERNEL); | |
7debc970 LZ |
845 | if (!event_descs) { |
846 | ret = -ENOMEM; | |
5c5cd7b5 | 847 | goto e_event_attrs; |
7debc970 | 848 | } |
5c5cd7b5 CS |
849 | |
850 | event_long_descs = kmalloc_array(event_idx + 1, | |
851 | sizeof(*event_long_descs), GFP_KERNEL); | |
7debc970 LZ |
852 | if (!event_long_descs) { |
853 | ret = -ENOMEM; | |
5c5cd7b5 | 854 | goto e_event_descs; |
7debc970 | 855 | } |
5c5cd7b5 CS |
856 | |
857 | /* Iterate over the catalog filling in the attribute vector */ | |
858 | for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0, | |
859 | event = event_data, event_idx = 0; | |
860 | event_idx < event_idx_last; | |
861 | event_idx++, ev_len = be16_to_cpu(event->length), | |
862 | event = (void *)event + ev_len) { | |
863 | char *name; | |
864 | int nl; | |
865 | int nonce; | |
866 | /* | |
867 | * these are the only "bad" events that are intermixed and that | |
868 | * we can ignore without issue. make sure to skip them here | |
869 | */ | |
870 | if (event->event_group_record_len == 0) | |
871 | continue; | |
872 | if (!catalog_entry_domain_is_valid(event->domain)) | |
873 | continue; | |
874 | ||
875 | name = event_name(event, &nl); | |
876 | nonce = event_uniq_add(&ev_uniq, name, nl, event->domain); | |
877 | ct = event_data_to_attrs(event_idx, events + event_attr_ct, | |
878 | event, nonce); | |
8f69dc70 | 879 | if (ct < 0) { |
5c5cd7b5 CS |
880 | pr_warn("event %zu (%.*s) creation failure, skipping\n", |
881 | event_idx, nl, name); | |
882 | junk_events++; | |
883 | } else { | |
8f69dc70 | 884 | event_attr_ct++; |
5c5cd7b5 CS |
885 | event_descs[desc_ct] = event_to_desc_attr(event, nonce); |
886 | if (event_descs[desc_ct]) | |
887 | desc_ct++; | |
888 | event_long_descs[long_desc_ct] = | |
889 | event_to_long_desc_attr(event, nonce); | |
890 | if (event_long_descs[long_desc_ct]) | |
891 | long_desc_ct++; | |
892 | } | |
893 | } | |
894 | ||
895 | pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n", | |
896 | event_idx, event_attr_ct, junk_events, desc_ct); | |
897 | ||
898 | events[event_attr_ct] = NULL; | |
899 | event_descs[desc_ct] = NULL; | |
900 | event_long_descs[long_desc_ct] = NULL; | |
901 | ||
902 | event_uniq_destroy(&ev_uniq); | |
903 | vfree(event_data); | |
904 | kmem_cache_free(hv_page_cache, page); | |
905 | ||
906 | *events_ = events; | |
907 | *event_descs_ = event_descs; | |
908 | *event_long_descs_ = event_long_descs; | |
7debc970 | 909 | return 0; |
5c5cd7b5 CS |
910 | |
911 | e_event_descs: | |
912 | kfree(event_descs); | |
913 | e_event_attrs: | |
914 | kfree(events); | |
915 | e_event_data: | |
916 | vfree(event_data); | |
917 | e_free: | |
918 | kmem_cache_free(hv_page_cache, page); | |
919 | e_out: | |
920 | *events_ = NULL; | |
921 | *event_descs_ = NULL; | |
922 | *event_long_descs_ = NULL; | |
7debc970 | 923 | return ret; |
5c5cd7b5 CS |
924 | } |
925 | ||
0e93a6ed CS |
926 | static ssize_t catalog_read(struct file *filp, struct kobject *kobj, |
927 | struct bin_attribute *bin_attr, char *buf, | |
928 | loff_t offset, size_t count) | |
929 | { | |
38d81846 | 930 | long hret; |
0e93a6ed | 931 | ssize_t ret = 0; |
56f12bee | 932 | size_t catalog_len = 0, catalog_page_len = 0; |
0e93a6ed | 933 | loff_t page_offset = 0; |
56f12bee | 934 | loff_t offset_in_page; |
935 | size_t copy_len; | |
bbad3e50 | 936 | uint64_t catalog_version_num = 0; |
0e93a6ed CS |
937 | void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); |
938 | struct hv_24x7_catalog_page_0 *page_0 = page; | |
3ca4ea71 | 939 | |
0e93a6ed CS |
940 | if (!page) |
941 | return -ENOMEM; | |
942 | ||
943 | hret = h_get_24x7_catalog_page(page, 0, 0); | |
944 | if (hret) { | |
945 | ret = -EIO; | |
946 | goto e_free; | |
947 | } | |
948 | ||
bbad3e50 | 949 | catalog_version_num = be64_to_cpu(page_0->version); |
0e93a6ed CS |
950 | catalog_page_len = be32_to_cpu(page_0->length); |
951 | catalog_len = catalog_page_len * 4096; | |
952 | ||
953 | page_offset = offset / 4096; | |
56f12bee | 954 | offset_in_page = offset % 4096; |
0e93a6ed CS |
955 | |
956 | if (page_offset >= catalog_page_len) | |
957 | goto e_free; | |
958 | ||
959 | if (page_offset != 0) { | |
960 | hret = h_get_24x7_catalog_page(page, catalog_version_num, | |
961 | page_offset); | |
962 | if (hret) { | |
963 | ret = -EIO; | |
964 | goto e_free; | |
965 | } | |
966 | } | |
967 | ||
56f12bee | 968 | copy_len = 4096 - offset_in_page; |
969 | if (copy_len > count) | |
970 | copy_len = count; | |
971 | ||
972 | memcpy(buf, page+offset_in_page, copy_len); | |
973 | ret = copy_len; | |
974 | ||
0e93a6ed CS |
975 | e_free: |
976 | if (hret) | |
bbad3e50 CS |
977 | pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:" |
978 | " rc=%ld\n", | |
979 | catalog_version_num, page_offset, hret); | |
d6589722 | 980 | kmem_cache_free(hv_page_cache, page); |
0e93a6ed | 981 | |
56f12bee | 982 | pr_devel("catalog_read: offset=%lld(%lld) count=%zu " |
983 | "catalog_len=%zu(%zu) => %zd\n", offset, page_offset, | |
984 | count, catalog_len, catalog_page_len, ret); | |
0e93a6ed CS |
985 | |
986 | return ret; | |
987 | } | |
988 | ||
d34171e8 SB |
989 | static ssize_t domains_show(struct device *dev, struct device_attribute *attr, |
990 | char *page) | |
991 | { | |
992 | int d, n, count = 0; | |
993 | const char *str; | |
994 | ||
995 | for (d = 0; d < HV_PERF_DOMAIN_MAX; d++) { | |
996 | str = domain_name(d); | |
997 | if (!str) | |
998 | continue; | |
999 | ||
1000 | n = sprintf(page, "%d: %s\n", d, str); | |
1001 | if (n < 0) | |
1002 | break; | |
1003 | ||
1004 | count += n; | |
1005 | page += n; | |
1006 | } | |
1007 | return count; | |
1008 | } | |
1009 | ||
0e93a6ed CS |
1010 | #define PAGE_0_ATTR(_name, _fmt, _expr) \ |
1011 | static ssize_t _name##_show(struct device *dev, \ | |
1012 | struct device_attribute *dev_attr, \ | |
1013 | char *buf) \ | |
1014 | { \ | |
38d81846 | 1015 | long hret; \ |
0e93a6ed CS |
1016 | ssize_t ret = 0; \ |
1017 | void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \ | |
1018 | struct hv_24x7_catalog_page_0 *page_0 = page; \ | |
1019 | if (!page) \ | |
1020 | return -ENOMEM; \ | |
1021 | hret = h_get_24x7_catalog_page(page, 0, 0); \ | |
1022 | if (hret) { \ | |
1023 | ret = -EIO; \ | |
1024 | goto e_free; \ | |
1025 | } \ | |
1026 | ret = sprintf(buf, _fmt, _expr); \ | |
1027 | e_free: \ | |
ec2aef5a | 1028 | kmem_cache_free(hv_page_cache, page); \ |
0e93a6ed CS |
1029 | return ret; \ |
1030 | } \ | |
1031 | static DEVICE_ATTR_RO(_name) | |
1032 | ||
1033 | PAGE_0_ATTR(catalog_version, "%lld\n", | |
bbad3e50 | 1034 | (unsigned long long)be64_to_cpu(page_0->version)); |
0e93a6ed CS |
1035 | PAGE_0_ATTR(catalog_len, "%lld\n", |
1036 | (unsigned long long)be32_to_cpu(page_0->length) * 4096); | |
1037 | static BIN_ATTR_RO(catalog, 0/* real length varies */); | |
d34171e8 | 1038 | static DEVICE_ATTR_RO(domains); |
0e93a6ed CS |
1039 | |
1040 | static struct bin_attribute *if_bin_attrs[] = { | |
1041 | &bin_attr_catalog, | |
1042 | NULL, | |
1043 | }; | |
1044 | ||
1045 | static struct attribute *if_attrs[] = { | |
1046 | &dev_attr_catalog_len.attr, | |
1047 | &dev_attr_catalog_version.attr, | |
d34171e8 | 1048 | &dev_attr_domains.attr, |
0e93a6ed CS |
1049 | NULL, |
1050 | }; | |
1051 | ||
1052 | static struct attribute_group if_group = { | |
1053 | .name = "interface", | |
1054 | .bin_attrs = if_bin_attrs, | |
1055 | .attrs = if_attrs, | |
1056 | }; | |
1057 | ||
1058 | static const struct attribute_group *attr_groups[] = { | |
1059 | &format_group, | |
5c5cd7b5 CS |
1060 | &event_group, |
1061 | &event_desc_group, | |
1062 | &event_long_desc_group, | |
0e93a6ed CS |
1063 | &if_group, |
1064 | NULL, | |
1065 | }; | |
1066 | ||
aeab199d SB |
1067 | /* |
1068 | * Start the process for a new H_GET_24x7_DATA hcall. | |
1069 | */ | |
1070 | static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer, | |
40386217 | 1071 | struct hv_24x7_data_result_buffer *result_buffer) |
aeab199d SB |
1072 | { |
1073 | ||
ebd4a5a3 TJB |
1074 | memset(request_buffer, 0, H24x7_DATA_BUFFER_SIZE); |
1075 | memset(result_buffer, 0, H24x7_DATA_BUFFER_SIZE); | |
aeab199d | 1076 | |
2e6553aa | 1077 | request_buffer->interface_version = interface_version; |
aeab199d SB |
1078 | /* memset above set request_buffer->num_requests to 0 */ |
1079 | } | |
f34b6c72 | 1080 | |
aeab199d SB |
1081 | /* |
1082 | * Commit (i.e perform) the H_GET_24x7_DATA hcall using the data collected | |
1083 | * by 'init_24x7_request()' and 'add_event_to_24x7_request()'. | |
1084 | */ | |
1085 | static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer, | |
40386217 | 1086 | struct hv_24x7_data_result_buffer *result_buffer) |
0e93a6ed | 1087 | { |
38d81846 | 1088 | long ret; |
0e93a6ed CS |
1089 | |
1090 | /* | |
aeab199d SB |
1091 | * NOTE: Due to variable number of array elements in request and |
1092 | * result buffer(s), sizeof() is not reliable. Use the actual | |
1093 | * allocated buffer size, H24x7_DATA_BUFFER_SIZE. | |
0e93a6ed | 1094 | */ |
aeab199d SB |
1095 | ret = plpar_hcall_norets(H_GET_24X7_DATA, |
1096 | virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE, | |
1097 | virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE); | |
1098 | ||
62714a14 TJB |
1099 | if (ret) { |
1100 | struct hv_24x7_request *req; | |
1101 | ||
2e6553aa | 1102 | req = request_buffer->requests; |
62714a14 TJB |
1103 | pr_notice_ratelimited("hcall failed: [%d %#x %#x %d] => ret 0x%lx (%ld) detail=0x%x failing ix=%x\n", |
1104 | req->performance_domain, req->data_offset, | |
1105 | req->starting_ix, req->starting_lpar_ix, | |
1106 | ret, ret, result_buffer->detailed_rc, | |
1107 | result_buffer->failing_request_ix); | |
38d81846 | 1108 | return -EIO; |
62714a14 | 1109 | } |
aeab199d | 1110 | |
38d81846 | 1111 | return 0; |
aeab199d SB |
1112 | } |
1113 | ||
e3ee15dc SB |
1114 | /* |
1115 | * Add the given @event to the next slot in the 24x7 request_buffer. | |
1116 | * | |
1117 | * Note that H_GET_24X7_DATA hcall allows reading several counters' | |
1118 | * values in a single HCALL. We expect the caller to add events to the | |
1119 | * request buffer one by one, make the HCALL and process the results. | |
1120 | */ | |
1121 | static int add_event_to_24x7_request(struct perf_event *event, | |
1122 | struct hv_24x7_request_buffer *request_buffer) | |
0e93a6ed | 1123 | { |
80798764 | 1124 | u16 idx; |
e3ee15dc | 1125 | int i; |
2e6553aa | 1126 | size_t req_size; |
e3ee15dc SB |
1127 | struct hv_24x7_request *req; |
1128 | ||
2e6553aa TJB |
1129 | if (request_buffer->num_requests >= |
1130 | max_num_requests(request_buffer->interface_version)) { | |
e3ee15dc SB |
1131 | pr_devel("Too many requests for 24x7 HCALL %d\n", |
1132 | request_buffer->num_requests); | |
1133 | return -EINVAL; | |
1134 | } | |
1135 | ||
e5a5886d SB |
1136 | switch (event_get_domain(event)) { |
1137 | case HV_PERF_DOMAIN_PHYS_CHIP: | |
1138 | idx = event_get_chip(event); | |
1139 | break; | |
1140 | case HV_PERF_DOMAIN_PHYS_CORE: | |
e3ee15dc | 1141 | idx = event_get_core(event); |
e5a5886d SB |
1142 | break; |
1143 | default: | |
e3ee15dc | 1144 | idx = event_get_vcpu(event); |
e5a5886d | 1145 | } |
e3ee15dc | 1146 | |
2e6553aa TJB |
1147 | req_size = H24x7_REQUEST_SIZE(request_buffer->interface_version); |
1148 | ||
e3ee15dc | 1149 | i = request_buffer->num_requests++; |
2e6553aa | 1150 | req = (void *) request_buffer->requests + i * req_size; |
e3ee15dc SB |
1151 | |
1152 | req->performance_domain = event_get_domain(event); | |
1153 | req->data_size = cpu_to_be16(8); | |
1154 | req->data_offset = cpu_to_be32(event_get_offset(event)); | |
ebd4a5a3 | 1155 | req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)); |
e3ee15dc SB |
1156 | req->max_num_lpars = cpu_to_be16(1); |
1157 | req->starting_ix = cpu_to_be16(idx); | |
1158 | req->max_ix = cpu_to_be16(1); | |
1159 | ||
bfaa7834 TJB |
1160 | if (request_buffer->interface_version > 1) { |
1161 | if (domain_needs_aggregation(req->performance_domain)) | |
1162 | req->max_num_thread_groups = -1; | |
1163 | else if (req->performance_domain != HV_PERF_DOMAIN_PHYS_CHIP) { | |
1164 | req->starting_thread_group_ix = idx % 2; | |
1165 | req->max_num_thread_groups = 1; | |
1166 | } | |
2e6553aa TJB |
1167 | } |
1168 | ||
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | /** | |
bfaa7834 TJB |
1173 | * get_count_from_result - get event count from all result elements in result |
1174 | * | |
1175 | * If the event corresponding to this result needs aggregation of the result | |
1176 | * element values, then this function does that. | |
2e6553aa TJB |
1177 | * |
1178 | * @event: Event associated with @res. | |
1179 | * @resb: Result buffer containing @res. | |
1180 | * @res: Result to work on. | |
1181 | * @countp: Output variable containing the event count. | |
1182 | * @next: Optional output variable pointing to the next result in @resb. | |
1183 | */ | |
1184 | static int get_count_from_result(struct perf_event *event, | |
1185 | struct hv_24x7_data_result_buffer *resb, | |
1186 | struct hv_24x7_result *res, u64 *countp, | |
1187 | struct hv_24x7_result **next) | |
1188 | { | |
1189 | u16 num_elements = be16_to_cpu(res->num_elements_returned); | |
1190 | u16 data_size = be16_to_cpu(res->result_element_data_size); | |
1191 | unsigned int data_offset; | |
1192 | void *element_data; | |
bfaa7834 TJB |
1193 | int i; |
1194 | u64 count; | |
2e6553aa TJB |
1195 | |
1196 | /* | |
1197 | * We can bail out early if the result is empty. | |
1198 | */ | |
1199 | if (!num_elements) { | |
1200 | pr_debug("Result of request %hhu is empty, nothing to do\n", | |
1201 | res->result_ix); | |
1202 | ||
1203 | if (next) | |
1204 | *next = (struct hv_24x7_result *) res->elements; | |
1205 | ||
1206 | return -ENODATA; | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * Since we always specify 1 as the maximum for the smallest resource | |
1211 | * we're requesting, there should to be only one element per result. | |
bfaa7834 | 1212 | * Except when an event needs aggregation, in which case there are more. |
2e6553aa | 1213 | */ |
bfaa7834 TJB |
1214 | if (num_elements != 1 && |
1215 | !domain_needs_aggregation(event_get_domain(event))) { | |
2e6553aa TJB |
1216 | pr_err("Error: result of request %hhu has %hu elements\n", |
1217 | res->result_ix, num_elements); | |
1218 | ||
1219 | return -EIO; | |
1220 | } | |
1221 | ||
1222 | if (data_size != sizeof(u64)) { | |
1223 | pr_debug("Error: result of request %hhu has data of %hu bytes\n", | |
1224 | res->result_ix, data_size); | |
1225 | ||
1226 | return -ENOTSUPP; | |
1227 | } | |
1228 | ||
1229 | if (resb->interface_version == 1) | |
1230 | data_offset = offsetof(struct hv_24x7_result_element_v1, | |
1231 | element_data); | |
1232 | else | |
1233 | data_offset = offsetof(struct hv_24x7_result_element_v2, | |
1234 | element_data); | |
1235 | ||
bfaa7834 TJB |
1236 | /* Go through the result elements in the result. */ |
1237 | for (i = count = 0, element_data = res->elements + data_offset; | |
1238 | i < num_elements; | |
1239 | i++, element_data += data_size + data_offset) | |
1240 | count += be64_to_cpu(*((u64 *) element_data)); | |
2e6553aa | 1241 | |
bfaa7834 | 1242 | *countp = count; |
2e6553aa | 1243 | |
bfaa7834 | 1244 | /* The next result is after the last result element. */ |
2e6553aa | 1245 | if (next) |
bfaa7834 | 1246 | *next = element_data - data_offset; |
2e6553aa | 1247 | |
e3ee15dc SB |
1248 | return 0; |
1249 | } | |
1250 | ||
38d81846 | 1251 | static int single_24x7_request(struct perf_event *event, u64 *count) |
e3ee15dc | 1252 | { |
38d81846 | 1253 | int ret; |
145264e2 SB |
1254 | struct hv_24x7_request_buffer *request_buffer; |
1255 | struct hv_24x7_data_result_buffer *result_buffer; | |
48bee8a6 CS |
1256 | |
1257 | BUILD_BUG_ON(sizeof(*request_buffer) > 4096); | |
1258 | BUILD_BUG_ON(sizeof(*result_buffer) > 4096); | |
1259 | ||
f34b6c72 | 1260 | request_buffer = (void *)get_cpu_var(hv_24x7_reqb); |
1261 | result_buffer = (void *)get_cpu_var(hv_24x7_resb); | |
48bee8a6 | 1262 | |
aeab199d | 1263 | init_24x7_request(request_buffer, result_buffer); |
0e93a6ed | 1264 | |
e3ee15dc SB |
1265 | ret = add_event_to_24x7_request(event, request_buffer); |
1266 | if (ret) | |
b816ce67 | 1267 | goto out; |
0e93a6ed | 1268 | |
aeab199d | 1269 | ret = make_24x7_request(request_buffer, result_buffer); |
62714a14 | 1270 | if (ret) |
f34b6c72 | 1271 | goto out; |
0e93a6ed | 1272 | |
aeab199d | 1273 | /* process result from hcall */ |
2e6553aa TJB |
1274 | ret = get_count_from_result(event, result_buffer, |
1275 | result_buffer->results, count, NULL); | |
48bee8a6 | 1276 | |
48bee8a6 | 1277 | out: |
b816ce67 SB |
1278 | put_cpu_var(hv_24x7_reqb); |
1279 | put_cpu_var(hv_24x7_resb); | |
0e93a6ed CS |
1280 | return ret; |
1281 | } | |
1282 | ||
0e93a6ed CS |
1283 | |
1284 | static int h_24x7_event_init(struct perf_event *event) | |
1285 | { | |
1286 | struct hv_perf_caps caps; | |
1287 | unsigned domain; | |
1288 | unsigned long hret; | |
1289 | u64 ct; | |
1290 | ||
1291 | /* Not our event */ | |
1292 | if (event->attr.type != event->pmu->type) | |
1293 | return -ENOENT; | |
1294 | ||
1295 | /* Unused areas must be 0 */ | |
1296 | if (event_get_reserved1(event) || | |
1297 | event_get_reserved2(event) || | |
1298 | event_get_reserved3(event)) { | |
1299 | pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n", | |
1300 | event->attr.config, | |
1301 | event_get_reserved1(event), | |
1302 | event->attr.config1, | |
1303 | event_get_reserved2(event), | |
1304 | event->attr.config2, | |
1305 | event_get_reserved3(event)); | |
1306 | return -EINVAL; | |
1307 | } | |
1308 | ||
1309 | /* unsupported modes and filters */ | |
1310 | if (event->attr.exclude_user || | |
1311 | event->attr.exclude_kernel || | |
1312 | event->attr.exclude_hv || | |
1313 | event->attr.exclude_idle || | |
1314 | event->attr.exclude_host || | |
cc56d673 | 1315 | event->attr.exclude_guest) |
0e93a6ed CS |
1316 | return -EINVAL; |
1317 | ||
1318 | /* no branch sampling */ | |
1319 | if (has_branch_stack(event)) | |
1320 | return -EOPNOTSUPP; | |
1321 | ||
1322 | /* offset must be 8 byte aligned */ | |
1323 | if (event_get_offset(event) % 8) { | |
1324 | pr_devel("bad alignment\n"); | |
1325 | return -EINVAL; | |
1326 | } | |
1327 | ||
0e93a6ed | 1328 | domain = event_get_domain(event); |
ebd4a5a3 | 1329 | if (domain >= HV_PERF_DOMAIN_MAX) { |
0e93a6ed CS |
1330 | pr_devel("invalid domain %d\n", domain); |
1331 | return -EINVAL; | |
1332 | } | |
1333 | ||
1334 | hret = hv_perf_caps_get(&caps); | |
1335 | if (hret) { | |
1336 | pr_devel("could not get capabilities: rc=%ld\n", hret); | |
1337 | return -EIO; | |
1338 | } | |
1339 | ||
5c5cd7b5 | 1340 | /* Physical domains & other lpars require extra capabilities */ |
0e93a6ed CS |
1341 | if (!caps.collect_privileged && (is_physical_domain(domain) || |
1342 | (event_get_lpar(event) != event_get_lpar_max()))) { | |
f42cf8d6 | 1343 | pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n", |
0e93a6ed CS |
1344 | is_physical_domain(domain), |
1345 | event_get_lpar(event)); | |
1346 | return -EACCES; | |
1347 | } | |
1348 | ||
2b206ee6 | 1349 | /* Get the initial value of the counter for this event */ |
80798764 | 1350 | if (single_24x7_request(event, &ct)) { |
0e93a6ed CS |
1351 | pr_devel("test hcall failed\n"); |
1352 | return -EIO; | |
1353 | } | |
2b206ee6 | 1354 | (void)local64_xchg(&event->hw.prev_count, ct); |
0e93a6ed CS |
1355 | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | static u64 h_24x7_get_value(struct perf_event *event) | |
1360 | { | |
0e93a6ed | 1361 | u64 ct; |
38d81846 TJB |
1362 | |
1363 | if (single_24x7_request(event, &ct)) | |
0e93a6ed CS |
1364 | /* We checked this in event init, shouldn't fail here... */ |
1365 | return 0; | |
1366 | ||
1367 | return ct; | |
1368 | } | |
1369 | ||
529ce8c9 | 1370 | static void update_event_count(struct perf_event *event, u64 now) |
0e93a6ed CS |
1371 | { |
1372 | s64 prev; | |
3ca4ea71 | 1373 | |
0e93a6ed CS |
1374 | prev = local64_xchg(&event->hw.prev_count, now); |
1375 | local64_add(now - prev, &event->count); | |
1376 | } | |
1377 | ||
529ce8c9 SB |
1378 | static void h_24x7_event_read(struct perf_event *event) |
1379 | { | |
1380 | u64 now; | |
88a48613 SB |
1381 | struct hv_24x7_request_buffer *request_buffer; |
1382 | struct hv_24x7_hw *h24x7hw; | |
1383 | int txn_flags; | |
1384 | ||
1385 | txn_flags = __this_cpu_read(hv_24x7_txn_flags); | |
1386 | ||
1387 | /* | |
1388 | * If in a READ transaction, add this counter to the list of | |
1389 | * counters to read during the next HCALL (i.e commit_txn()). | |
1390 | * If not in a READ transaction, go ahead and make the HCALL | |
1391 | * to read this counter by itself. | |
1392 | */ | |
1393 | ||
1394 | if (txn_flags & PERF_PMU_TXN_READ) { | |
1395 | int i; | |
1396 | int ret; | |
529ce8c9 | 1397 | |
88a48613 SB |
1398 | if (__this_cpu_read(hv_24x7_txn_err)) |
1399 | return; | |
1400 | ||
1401 | request_buffer = (void *)get_cpu_var(hv_24x7_reqb); | |
1402 | ||
1403 | ret = add_event_to_24x7_request(event, request_buffer); | |
1404 | if (ret) { | |
1405 | __this_cpu_write(hv_24x7_txn_err, ret); | |
1406 | } else { | |
1407 | /* | |
027dfac6 | 1408 | * Associate the event with the HCALL request index, |
88a48613 SB |
1409 | * so ->commit_txn() can quickly find/update count. |
1410 | */ | |
1411 | i = request_buffer->num_requests - 1; | |
1412 | ||
1413 | h24x7hw = &get_cpu_var(hv_24x7_hw); | |
1414 | h24x7hw->events[i] = event; | |
1415 | put_cpu_var(h24x7hw); | |
2b206ee6 SB |
1416 | /* |
1417 | * Clear the event count so we can compute the _change_ | |
1418 | * in the 24x7 raw counter value at the end of the txn. | |
1419 | * | |
1420 | * Note that we could alternatively read the 24x7 value | |
1421 | * now and save its value in event->hw.prev_count. But | |
1422 | * that would require issuing a hcall, which would then | |
1423 | * defeat the purpose of using the txn interface. | |
1424 | */ | |
1425 | local64_set(&event->count, 0); | |
88a48613 SB |
1426 | } |
1427 | ||
1428 | put_cpu_var(hv_24x7_reqb); | |
1429 | } else { | |
1430 | now = h_24x7_get_value(event); | |
1431 | update_event_count(event, now); | |
1432 | } | |
529ce8c9 SB |
1433 | } |
1434 | ||
0e93a6ed CS |
1435 | static void h_24x7_event_start(struct perf_event *event, int flags) |
1436 | { | |
1437 | if (flags & PERF_EF_RELOAD) | |
1438 | local64_set(&event->hw.prev_count, h_24x7_get_value(event)); | |
1439 | } | |
1440 | ||
1441 | static void h_24x7_event_stop(struct perf_event *event, int flags) | |
1442 | { | |
33ba14c0 | 1443 | h_24x7_event_read(event); |
0e93a6ed CS |
1444 | } |
1445 | ||
1446 | static int h_24x7_event_add(struct perf_event *event, int flags) | |
1447 | { | |
1448 | if (flags & PERF_EF_START) | |
1449 | h_24x7_event_start(event, flags); | |
1450 | ||
1451 | return 0; | |
1452 | } | |
1453 | ||
88a48613 SB |
1454 | /* |
1455 | * 24x7 counters only support READ transactions. They are | |
1456 | * always counting and dont need/support ADD transactions. | |
1457 | * Cache the flags, but otherwise ignore transactions that | |
1458 | * are not PERF_PMU_TXN_READ. | |
1459 | */ | |
1460 | static void h_24x7_event_start_txn(struct pmu *pmu, unsigned int flags) | |
1461 | { | |
1462 | struct hv_24x7_request_buffer *request_buffer; | |
1463 | struct hv_24x7_data_result_buffer *result_buffer; | |
1464 | ||
1465 | /* We should not be called if we are already in a txn */ | |
1466 | WARN_ON_ONCE(__this_cpu_read(hv_24x7_txn_flags)); | |
1467 | ||
1468 | __this_cpu_write(hv_24x7_txn_flags, flags); | |
1469 | if (flags & ~PERF_PMU_TXN_READ) | |
1470 | return; | |
1471 | ||
1472 | request_buffer = (void *)get_cpu_var(hv_24x7_reqb); | |
1473 | result_buffer = (void *)get_cpu_var(hv_24x7_resb); | |
1474 | ||
1475 | init_24x7_request(request_buffer, result_buffer); | |
1476 | ||
1477 | put_cpu_var(hv_24x7_resb); | |
1478 | put_cpu_var(hv_24x7_reqb); | |
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * Clean up transaction state. | |
1483 | * | |
1484 | * NOTE: Ignore state of request and result buffers for now. | |
1485 | * We will initialize them during the next read/txn. | |
1486 | */ | |
1487 | static void reset_txn(void) | |
1488 | { | |
1489 | __this_cpu_write(hv_24x7_txn_flags, 0); | |
1490 | __this_cpu_write(hv_24x7_txn_err, 0); | |
1491 | } | |
1492 | ||
1493 | /* | |
1494 | * 24x7 counters only support READ transactions. They are always counting | |
1495 | * and dont need/support ADD transactions. Clear ->txn_flags but otherwise | |
1496 | * ignore transactions that are not of type PERF_PMU_TXN_READ. | |
1497 | * | |
1498 | * For READ transactions, submit all pending 24x7 requests (i.e requests | |
1499 | * that were queued by h_24x7_event_read()), to the hypervisor and update | |
1500 | * the event counts. | |
1501 | */ | |
1502 | static int h_24x7_event_commit_txn(struct pmu *pmu) | |
1503 | { | |
1504 | struct hv_24x7_request_buffer *request_buffer; | |
1505 | struct hv_24x7_data_result_buffer *result_buffer; | |
41f577eb | 1506 | struct hv_24x7_result *res, *next_res; |
88a48613 SB |
1507 | u64 count; |
1508 | int i, ret, txn_flags; | |
1509 | struct hv_24x7_hw *h24x7hw; | |
1510 | ||
1511 | txn_flags = __this_cpu_read(hv_24x7_txn_flags); | |
1512 | WARN_ON_ONCE(!txn_flags); | |
1513 | ||
1514 | ret = 0; | |
1515 | if (txn_flags & ~PERF_PMU_TXN_READ) | |
1516 | goto out; | |
1517 | ||
1518 | ret = __this_cpu_read(hv_24x7_txn_err); | |
1519 | if (ret) | |
1520 | goto out; | |
1521 | ||
1522 | request_buffer = (void *)get_cpu_var(hv_24x7_reqb); | |
1523 | result_buffer = (void *)get_cpu_var(hv_24x7_resb); | |
1524 | ||
1525 | ret = make_24x7_request(request_buffer, result_buffer); | |
62714a14 | 1526 | if (ret) |
88a48613 | 1527 | goto put_reqb; |
88a48613 SB |
1528 | |
1529 | h24x7hw = &get_cpu_var(hv_24x7_hw); | |
1530 | ||
41f577eb TJB |
1531 | /* Go through results in the result buffer to update event counts. */ |
1532 | for (i = 0, res = result_buffer->results; | |
1533 | i < result_buffer->num_results; i++, res = next_res) { | |
1534 | struct perf_event *event = h24x7hw->events[res->result_ix]; | |
41f577eb | 1535 | |
2e6553aa TJB |
1536 | ret = get_count_from_result(event, result_buffer, res, &count, |
1537 | &next_res); | |
1538 | if (ret) | |
1539 | break; | |
41f577eb | 1540 | |
88a48613 SB |
1541 | update_event_count(event, count); |
1542 | } | |
1543 | ||
1544 | put_cpu_var(hv_24x7_hw); | |
1545 | ||
1546 | put_reqb: | |
1547 | put_cpu_var(hv_24x7_resb); | |
1548 | put_cpu_var(hv_24x7_reqb); | |
1549 | out: | |
1550 | reset_txn(); | |
1551 | return ret; | |
1552 | } | |
1553 | ||
1554 | /* | |
1555 | * 24x7 counters only support READ transactions. They are always counting | |
1556 | * and dont need/support ADD transactions. However, regardless of type | |
1557 | * of transaction, all we need to do is cleanup, so we don't have to check | |
1558 | * the type of transaction. | |
1559 | */ | |
1560 | static void h_24x7_event_cancel_txn(struct pmu *pmu) | |
1561 | { | |
1562 | WARN_ON_ONCE(!__this_cpu_read(hv_24x7_txn_flags)); | |
1563 | reset_txn(); | |
1564 | } | |
1565 | ||
0e93a6ed CS |
1566 | static struct pmu h_24x7_pmu = { |
1567 | .task_ctx_nr = perf_invalid_context, | |
1568 | ||
1569 | .name = "hv_24x7", | |
1570 | .attr_groups = attr_groups, | |
1571 | .event_init = h_24x7_event_init, | |
1572 | .add = h_24x7_event_add, | |
1573 | .del = h_24x7_event_stop, | |
1574 | .start = h_24x7_event_start, | |
1575 | .stop = h_24x7_event_stop, | |
33ba14c0 | 1576 | .read = h_24x7_event_read, |
88a48613 SB |
1577 | .start_txn = h_24x7_event_start_txn, |
1578 | .commit_txn = h_24x7_event_commit_txn, | |
1579 | .cancel_txn = h_24x7_event_cancel_txn, | |
0e93a6ed CS |
1580 | }; |
1581 | ||
1582 | static int hv_24x7_init(void) | |
1583 | { | |
1584 | int r; | |
1585 | unsigned long hret; | |
1586 | struct hv_perf_caps caps; | |
1587 | ||
1588 | if (!firmware_has_feature(FW_FEATURE_LPAR)) { | |
e98bf005 | 1589 | pr_debug("not a virtualized system, not enabling\n"); |
0e93a6ed | 1590 | return -ENODEV; |
2e6553aa TJB |
1591 | } else if (!cur_cpu_spec->oprofile_cpu_type) |
1592 | return -ENODEV; | |
1593 | ||
1594 | /* POWER8 only supports v1, while POWER9 only supports v2. */ | |
1595 | if (!strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8")) | |
1596 | interface_version = 1; | |
bfaa7834 | 1597 | else { |
2e6553aa | 1598 | interface_version = 2; |
0e93a6ed | 1599 | |
bfaa7834 TJB |
1600 | /* SMT8 in POWER9 needs to aggregate result elements. */ |
1601 | if (threads_per_core == 8) | |
1602 | aggregate_result_elements = true; | |
1603 | } | |
1604 | ||
0e93a6ed CS |
1605 | hret = hv_perf_caps_get(&caps); |
1606 | if (hret) { | |
e98bf005 | 1607 | pr_debug("could not obtain capabilities, not enabling, rc=%ld\n", |
0e93a6ed CS |
1608 | hret); |
1609 | return -ENODEV; | |
1610 | } | |
1611 | ||
1612 | hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL); | |
1613 | if (!hv_page_cache) | |
1614 | return -ENOMEM; | |
1615 | ||
cc56d673 VW |
1616 | /* sampling not supported */ |
1617 | h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; | |
1618 | ||
7debc970 | 1619 | r = create_events_from_catalog(&event_group.attrs, |
5c5cd7b5 CS |
1620 | &event_desc_group.attrs, |
1621 | &event_long_desc_group.attrs); | |
1622 | ||
7debc970 LZ |
1623 | if (r) |
1624 | return r; | |
1625 | ||
0e93a6ed CS |
1626 | r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1); |
1627 | if (r) | |
1628 | return r; | |
1629 | ||
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | device_initcall(hv_24x7_init); |