1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Hypervisor supplied "gpci" ("get performance counter info") performance
4 * counter support
5 *
6 * Author: Cody P Schafer <cody@linux.vnet.ibm.com>
7 * Copyright 2014 IBM Corporation.
8 */
9
10 #define pr_fmt(fmt) "hv-gpci: " fmt
11
12 #include <linux/init.h>
13 #include <linux/perf_event.h>
14 #include <asm/firmware.h>
15 #include <asm/hvcall.h>
16 #include <asm/io.h>
17
18 #include "hv-gpci.h"
19 #include "hv-common.h"
20
21 /*
22 * Example usage:
23 * perf stat -e 'hv_gpci/counter_info_version=3,offset=0,length=8,
24 * secondary_index=0,starting_index=0xffffffff,request=0x10/' ...
25 */
26
27 /* u32 */
28 EVENT_DEFINE_RANGE_FORMAT(request, config, 0, 31);
29 /* u32 */
30 /*
31 * Note that starting_index, phys_processor_idx, sibling_part_id,
32 * hw_chip_id, partition_id all refer to the same bit range. They
33 * are basically aliases for the starting_index. The specific alias
34 * used depends on the event. See REQUEST_IDX_KIND in hv-gpci-requests.h
35 */
36 EVENT_DEFINE_RANGE_FORMAT(starting_index, config, 32, 63);
37 EVENT_DEFINE_RANGE_FORMAT_LITE(phys_processor_idx, config, 32, 63);
38 EVENT_DEFINE_RANGE_FORMAT_LITE(sibling_part_id, config, 32, 63);
39 EVENT_DEFINE_RANGE_FORMAT_LITE(hw_chip_id, config, 32, 63);
40 EVENT_DEFINE_RANGE_FORMAT_LITE(partition_id, config, 32, 63);
41
42 /* u16 */
43 EVENT_DEFINE_RANGE_FORMAT(secondary_index, config1, 0, 15);
44 /* u8 */
45 EVENT_DEFINE_RANGE_FORMAT(counter_info_version, config1, 16, 23);
46 /* u8, bytes of data (1-8) */
47 EVENT_DEFINE_RANGE_FORMAT(length, config1, 24, 31);
48 /* u32, byte offset */
49 EVENT_DEFINE_RANGE_FORMAT(offset, config1, 32, 63);
50
51 static cpumask_t hv_gpci_cpumask;
52
53 static struct attribute *format_attrs[] = {
54 &format_attr_request.attr,
55 &format_attr_starting_index.attr,
56 &format_attr_phys_processor_idx.attr,
57 &format_attr_sibling_part_id.attr,
58 &format_attr_hw_chip_id.attr,
59 &format_attr_partition_id.attr,
60 &format_attr_secondary_index.attr,
61 &format_attr_counter_info_version.attr,
62
63 &format_attr_offset.attr,
64 &format_attr_length.attr,
65 NULL,
66 };
67
68 static const struct attribute_group format_group = {
69 .name = "format",
70 .attrs = format_attrs,
71 };
72
73 static struct attribute_group event_group = {
74 .name = "events",
75 /* .attrs is set in init */
76 };
77
78 #define HV_CAPS_ATTR(_name, _format) \
79 static ssize_t _name##_show(struct device *dev, \
80 struct device_attribute *attr, \
81 char *page) \
82 { \
83 struct hv_perf_caps caps; \
84 unsigned long hret = hv_perf_caps_get(&caps); \
85 if (hret) \
86 return -EIO; \
87 \
88 return sprintf(page, _format, caps._name); \
89 } \
90 static struct device_attribute hv_caps_attr_##_name = __ATTR_RO(_name)
91
kernel_version_show(struct device * dev,struct device_attribute * attr,char * page)92 static ssize_t kernel_version_show(struct device *dev,
93 struct device_attribute *attr,
94 char *page)
95 {
96 return sprintf(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT);
97 }
98
cpumask_show(struct device * dev,struct device_attribute * attr,char * buf)99 static ssize_t cpumask_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
101 {
102 return cpumap_print_to_pagebuf(true, buf, &hv_gpci_cpumask);
103 }
104
105 /* Interface attribute array index to store system information */
106 #define INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR 6
107 #define INTERFACE_PROCESSOR_CONFIG_ATTR 7
108 #define INTERFACE_AFFINITY_DOMAIN_VIA_VP_ATTR 8
109 #define INTERFACE_AFFINITY_DOMAIN_VIA_DOM_ATTR 9
110 #define INTERFACE_AFFINITY_DOMAIN_VIA_PAR_ATTR 10
111 #define INTERFACE_NULL_ATTR 11
112
113 /* Counter request value to retrieve system information */
114 enum {
115 PROCESSOR_BUS_TOPOLOGY,
116 PROCESSOR_CONFIG,
117 AFFINITY_DOMAIN_VIA_VP, /* affinity domain via virtual processor */
118 AFFINITY_DOMAIN_VIA_DOM, /* affinity domain via domain */
119 AFFINITY_DOMAIN_VIA_PAR, /* affinity domain via partition */
120 };
121
122 static int sysinfo_counter_request[] = {
123 [PROCESSOR_BUS_TOPOLOGY] = 0xD0,
124 [PROCESSOR_CONFIG] = 0x90,
125 [AFFINITY_DOMAIN_VIA_VP] = 0xA0,
126 [AFFINITY_DOMAIN_VIA_DOM] = 0xB0,
127 [AFFINITY_DOMAIN_VIA_PAR] = 0xB1,
128 };
129
130 static DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));
131
systeminfo_gpci_request(u32 req,u32 starting_index,u16 secondary_index,char * buf,size_t * n,struct hv_gpci_request_buffer * arg)132 static unsigned long systeminfo_gpci_request(u32 req, u32 starting_index,
133 u16 secondary_index, char *buf,
134 size_t *n, struct hv_gpci_request_buffer *arg)
135 {
136 unsigned long ret;
137 size_t i, j;
138
139 arg->params.counter_request = cpu_to_be32(req);
140 arg->params.starting_index = cpu_to_be32(starting_index);
141 arg->params.secondary_index = cpu_to_be16(secondary_index);
142
143 ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
144 virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
145
146 /*
147 * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL',
148 * which means that the current buffer size cannot accommodate
149 * all the information and a partial buffer returned.
150 * hcall fails incase of ret value other than H_SUCCESS or H_PARAMETER.
151 *
152 * ret value as H_AUTHORITY implies that partition is not permitted to retrieve
153 * performance information, and required to set
154 * "Enable Performance Information Collection" option.
155 */
156 if (ret == H_AUTHORITY)
157 return -EPERM;
158
159 /*
160 * hcall can fail with other possible ret value like H_PRIVILEGE/H_HARDWARE
161 * because of invalid buffer-length/address or due to some hardware
162 * error.
163 */
164 if (ret && (ret != H_PARAMETER))
165 return -EIO;
166
167 /*
168 * hcall H_GET_PERF_COUNTER_INFO populates the 'returned_values'
169 * to show the total number of counter_value array elements
170 * returned via hcall.
171 * hcall also populates 'cv_element_size' corresponds to individual
172 * counter_value array element size. Below loop go through all
173 * counter_value array elements as per their size and add it to
174 * the output buffer.
175 */
176 for (i = 0; i < be16_to_cpu(arg->params.returned_values); i++) {
177 j = i * be16_to_cpu(arg->params.cv_element_size);
178
179 for (; j < (i + 1) * be16_to_cpu(arg->params.cv_element_size); j++)
180 *n += sprintf(buf + *n, "%02x", (u8)arg->bytes[j]);
181 *n += sprintf(buf + *n, "\n");
182 }
183
184 if (*n >= PAGE_SIZE) {
185 pr_info("System information exceeds PAGE_SIZE\n");
186 return -EFBIG;
187 }
188
189 return ret;
190 }
191
processor_bus_topology_show(struct device * dev,struct device_attribute * attr,char * buf)192 static ssize_t processor_bus_topology_show(struct device *dev, struct device_attribute *attr,
193 char *buf)
194 {
195 struct hv_gpci_request_buffer *arg;
196 unsigned long ret;
197 size_t n = 0;
198
199 arg = (void *)get_cpu_var(hv_gpci_reqb);
200 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
201
202 /*
203 * Pass the counter request value 0xD0 corresponds to request
204 * type 'Processor_bus_topology', to retrieve
205 * the system topology information.
206 * starting_index value implies the starting hardware
207 * chip id.
208 */
209 ret = systeminfo_gpci_request(sysinfo_counter_request[PROCESSOR_BUS_TOPOLOGY],
210 0, 0, buf, &n, arg);
211
212 if (!ret)
213 return n;
214
215 if (ret != H_PARAMETER)
216 goto out;
217
218 /*
219 * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL', which
220 * implies that buffer can't accommodate all information, and a partial buffer
221 * returned. To handle that, we need to make subsequent requests
222 * with next starting index to retrieve additional (missing) data.
223 * Below loop do subsequent hcalls with next starting index and add it
224 * to buffer util we get all the information.
225 */
226 while (ret == H_PARAMETER) {
227 int returned_values = be16_to_cpu(arg->params.returned_values);
228 int elementsize = be16_to_cpu(arg->params.cv_element_size);
229 int last_element = (returned_values - 1) * elementsize;
230
231 /*
232 * Since the starting index value is part of counter_value
233 * buffer elements, use the starting index value in the last
234 * element and add 1 to make subsequent hcalls.
235 */
236 u32 starting_index = arg->bytes[last_element + 3] +
237 (arg->bytes[last_element + 2] << 8) +
238 (arg->bytes[last_element + 1] << 16) +
239 (arg->bytes[last_element] << 24) + 1;
240
241 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
242
243 ret = systeminfo_gpci_request(sysinfo_counter_request[PROCESSOR_BUS_TOPOLOGY],
244 starting_index, 0, buf, &n, arg);
245
246 if (!ret)
247 return n;
248
249 if (ret != H_PARAMETER)
250 goto out;
251 }
252
253 return n;
254
255 out:
256 put_cpu_var(hv_gpci_reqb);
257 return ret;
258 }
259
processor_config_show(struct device * dev,struct device_attribute * attr,char * buf)260 static ssize_t processor_config_show(struct device *dev, struct device_attribute *attr,
261 char *buf)
262 {
263 struct hv_gpci_request_buffer *arg;
264 unsigned long ret;
265 size_t n = 0;
266
267 arg = (void *)get_cpu_var(hv_gpci_reqb);
268 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
269
270 /*
271 * Pass the counter request value 0x90 corresponds to request
272 * type 'Processor_config', to retrieve
273 * the system processor information.
274 * starting_index value implies the starting hardware
275 * processor index.
276 */
277 ret = systeminfo_gpci_request(sysinfo_counter_request[PROCESSOR_CONFIG],
278 0, 0, buf, &n, arg);
279
280 if (!ret)
281 return n;
282
283 if (ret != H_PARAMETER)
284 goto out;
285
286 /*
287 * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL', which
288 * implies that buffer can't accommodate all information, and a partial buffer
289 * returned. To handle that, we need to take subsequent requests
290 * with next starting index to retrieve additional (missing) data.
291 * Below loop do subsequent hcalls with next starting index and add it
292 * to buffer util we get all the information.
293 */
294 while (ret == H_PARAMETER) {
295 int returned_values = be16_to_cpu(arg->params.returned_values);
296 int elementsize = be16_to_cpu(arg->params.cv_element_size);
297 int last_element = (returned_values - 1) * elementsize;
298
299 /*
300 * Since the starting index is part of counter_value
301 * buffer elements, use the starting index value in the last
302 * element and add 1 to subsequent hcalls.
303 */
304 u32 starting_index = arg->bytes[last_element + 3] +
305 (arg->bytes[last_element + 2] << 8) +
306 (arg->bytes[last_element + 1] << 16) +
307 (arg->bytes[last_element] << 24) + 1;
308
309 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
310
311 ret = systeminfo_gpci_request(sysinfo_counter_request[PROCESSOR_CONFIG],
312 starting_index, 0, buf, &n, arg);
313
314 if (!ret)
315 return n;
316
317 if (ret != H_PARAMETER)
318 goto out;
319 }
320
321 return n;
322
323 out:
324 put_cpu_var(hv_gpci_reqb);
325 return ret;
326 }
327
affinity_domain_via_virtual_processor_show(struct device * dev,struct device_attribute * attr,char * buf)328 static ssize_t affinity_domain_via_virtual_processor_show(struct device *dev,
329 struct device_attribute *attr, char *buf)
330 {
331 struct hv_gpci_request_buffer *arg;
332 unsigned long ret;
333 size_t n = 0;
334
335 arg = (void *)get_cpu_var(hv_gpci_reqb);
336 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
337
338 /*
339 * Pass the counter request 0xA0 corresponds to request
340 * type 'Affinity_domain_information_by_virutal_processor',
341 * to retrieve the system affinity domain information.
342 * starting_index value refers to the starting hardware
343 * processor index.
344 */
345 ret = systeminfo_gpci_request(sysinfo_counter_request[AFFINITY_DOMAIN_VIA_VP],
346 0, 0, buf, &n, arg);
347
348 if (!ret)
349 return n;
350
351 if (ret != H_PARAMETER)
352 goto out;
353
354 /*
355 * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL', which
356 * implies that buffer can't accommodate all information, and a partial buffer
357 * returned. To handle that, we need to take subsequent requests
358 * with next secondary index to retrieve additional (missing) data.
359 * Below loop do subsequent hcalls with next secondary index and add it
360 * to buffer util we get all the information.
361 */
362 while (ret == H_PARAMETER) {
363 int returned_values = be16_to_cpu(arg->params.returned_values);
364 int elementsize = be16_to_cpu(arg->params.cv_element_size);
365 int last_element = (returned_values - 1) * elementsize;
366
367 /*
368 * Since the starting index and secondary index type is part of the
369 * counter_value buffer elements, use the starting index value in the
370 * last array element as subsequent starting index, and use secondary index
371 * value in the last array element plus 1 as subsequent secondary index.
372 * For counter request '0xA0', starting index points to partition id
373 * and secondary index points to corresponding virtual processor index.
374 */
375 u32 starting_index = arg->bytes[last_element + 1] + (arg->bytes[last_element] << 8);
376 u16 secondary_index = arg->bytes[last_element + 3] +
377 (arg->bytes[last_element + 2] << 8) + 1;
378
379 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
380
381 ret = systeminfo_gpci_request(sysinfo_counter_request[AFFINITY_DOMAIN_VIA_VP],
382 starting_index, secondary_index, buf, &n, arg);
383
384 if (!ret)
385 return n;
386
387 if (ret != H_PARAMETER)
388 goto out;
389 }
390
391 return n;
392
393 out:
394 put_cpu_var(hv_gpci_reqb);
395 return ret;
396 }
397
affinity_domain_via_domain_show(struct device * dev,struct device_attribute * attr,char * buf)398 static ssize_t affinity_domain_via_domain_show(struct device *dev, struct device_attribute *attr,
399 char *buf)
400 {
401 struct hv_gpci_request_buffer *arg;
402 unsigned long ret;
403 size_t n = 0;
404
405 arg = (void *)get_cpu_var(hv_gpci_reqb);
406 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
407
408 /*
409 * Pass the counter request 0xB0 corresponds to request
410 * type 'Affinity_domain_information_by_domain',
411 * to retrieve the system affinity domain information.
412 * starting_index value refers to the starting hardware
413 * processor index.
414 */
415 ret = systeminfo_gpci_request(sysinfo_counter_request[AFFINITY_DOMAIN_VIA_DOM],
416 0, 0, buf, &n, arg);
417
418 if (!ret)
419 return n;
420
421 if (ret != H_PARAMETER)
422 goto out;
423
424 /*
425 * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL', which
426 * implies that buffer can't accommodate all information, and a partial buffer
427 * returned. To handle that, we need to take subsequent requests
428 * with next starting index to retrieve additional (missing) data.
429 * Below loop do subsequent hcalls with next starting index and add it
430 * to buffer util we get all the information.
431 */
432 while (ret == H_PARAMETER) {
433 int returned_values = be16_to_cpu(arg->params.returned_values);
434 int elementsize = be16_to_cpu(arg->params.cv_element_size);
435 int last_element = (returned_values - 1) * elementsize;
436
437 /*
438 * Since the starting index value is part of counter_value
439 * buffer elements, use the starting index value in the last
440 * element and add 1 to make subsequent hcalls.
441 */
442 u32 starting_index = arg->bytes[last_element + 1] +
443 (arg->bytes[last_element] << 8) + 1;
444
445 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
446
447 ret = systeminfo_gpci_request(sysinfo_counter_request[AFFINITY_DOMAIN_VIA_DOM],
448 starting_index, 0, buf, &n, arg);
449
450 if (!ret)
451 return n;
452
453 if (ret != H_PARAMETER)
454 goto out;
455 }
456
457 return n;
458
459 out:
460 put_cpu_var(hv_gpci_reqb);
461 return ret;
462 }
463
affinity_domain_via_partition_result_parse(int returned_values,int element_size,char * buf,size_t * last_element,size_t * n,struct hv_gpci_request_buffer * arg)464 static void affinity_domain_via_partition_result_parse(int returned_values,
465 int element_size, char *buf, size_t *last_element,
466 size_t *n, struct hv_gpci_request_buffer *arg)
467 {
468 size_t i = 0, j = 0;
469 size_t k, l, m;
470 uint16_t total_affinity_domain_ele, size_of_each_affinity_domain_ele;
471
472 /*
473 * hcall H_GET_PERF_COUNTER_INFO populates the 'returned_values'
474 * to show the total number of counter_value array elements
475 * returned via hcall.
476 * Unlike other request types, the data structure returned by this
477 * request is variable-size. For this counter request type,
478 * hcall populates 'cv_element_size' corresponds to minimum size of
479 * the structure returned i.e; the size of the structure with no domain
480 * information. Below loop go through all counter_value array
481 * to determine the number and size of each domain array element and
482 * add it to the output buffer.
483 */
484 while (i < returned_values) {
485 k = j;
486 for (; k < j + element_size; k++)
487 *n += sprintf(buf + *n, "%02x", (u8)arg->bytes[k]);
488 *n += sprintf(buf + *n, "\n");
489
490 total_affinity_domain_ele = (u8)arg->bytes[k - 2] << 8 | (u8)arg->bytes[k - 3];
491 size_of_each_affinity_domain_ele = (u8)arg->bytes[k] << 8 | (u8)arg->bytes[k - 1];
492
493 for (l = 0; l < total_affinity_domain_ele; l++) {
494 for (m = 0; m < size_of_each_affinity_domain_ele; m++) {
495 *n += sprintf(buf + *n, "%02x", (u8)arg->bytes[k]);
496 k++;
497 }
498 *n += sprintf(buf + *n, "\n");
499 }
500
501 *n += sprintf(buf + *n, "\n");
502 i++;
503 j = k;
504 }
505
506 *last_element = k;
507 }
508
affinity_domain_via_partition_show(struct device * dev,struct device_attribute * attr,char * buf)509 static ssize_t affinity_domain_via_partition_show(struct device *dev, struct device_attribute *attr,
510 char *buf)
511 {
512 struct hv_gpci_request_buffer *arg;
513 unsigned long ret;
514 size_t n = 0;
515 size_t last_element = 0;
516 u32 starting_index;
517
518 arg = (void *)get_cpu_var(hv_gpci_reqb);
519 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
520
521 /*
522 * Pass the counter request value 0xB1 corresponds to counter request
523 * type 'Affinity_domain_information_by_partition',
524 * to retrieve the system affinity domain by partition information.
525 * starting_index value refers to the starting hardware
526 * processor index.
527 */
528 arg->params.counter_request = cpu_to_be32(sysinfo_counter_request[AFFINITY_DOMAIN_VIA_PAR]);
529 arg->params.starting_index = cpu_to_be32(0);
530
531 ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
532 virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
533
534 if (!ret)
535 goto parse_result;
536
537 /*
538 * ret value as 'H_PARAMETER' implies that the current buffer size
539 * can't accommodate all the information, and a partial buffer
540 * returned. To handle that, we need to make subsequent requests
541 * with next starting index to retrieve additional (missing) data.
542 * Below loop do subsequent hcalls with next starting index and add it
543 * to buffer util we get all the information.
544 */
545 while (ret == H_PARAMETER) {
546 affinity_domain_via_partition_result_parse(
547 be16_to_cpu(arg->params.returned_values) - 1,
548 be16_to_cpu(arg->params.cv_element_size), buf,
549 &last_element, &n, arg);
550
551 if (n >= PAGE_SIZE) {
552 put_cpu_var(hv_gpci_reqb);
553 pr_debug("System information exceeds PAGE_SIZE\n");
554 return -EFBIG;
555 }
556
557 /*
558 * Since the starting index value is part of counter_value
559 * buffer elements, use the starting_index value in the last
560 * element and add 1 to make subsequent hcalls.
561 */
562 starting_index = (u8)arg->bytes[last_element] << 8 |
563 (u8)arg->bytes[last_element + 1];
564
565 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
566 arg->params.counter_request = cpu_to_be32(
567 sysinfo_counter_request[AFFINITY_DOMAIN_VIA_PAR]);
568 arg->params.starting_index = cpu_to_be32(starting_index);
569
570 ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
571 virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
572
573 if (ret && (ret != H_PARAMETER))
574 goto out;
575 }
576
577 parse_result:
578 affinity_domain_via_partition_result_parse(
579 be16_to_cpu(arg->params.returned_values),
580 be16_to_cpu(arg->params.cv_element_size),
581 buf, &last_element, &n, arg);
582
583 put_cpu_var(hv_gpci_reqb);
584 return n;
585
586 out:
587 put_cpu_var(hv_gpci_reqb);
588
589 /*
590 * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL',
591 * which means that the current buffer size cannot accommodate
592 * all the information and a partial buffer returned.
593 * hcall fails incase of ret value other than H_SUCCESS or H_PARAMETER.
594 *
595 * ret value as H_AUTHORITY implies that partition is not permitted to retrieve
596 * performance information, and required to set
597 * "Enable Performance Information Collection" option.
598 */
599 if (ret == H_AUTHORITY)
600 return -EPERM;
601
602 /*
603 * hcall can fail with other possible ret value like H_PRIVILEGE/H_HARDWARE
604 * because of invalid buffer-length/address or due to some hardware
605 * error.
606 */
607 return -EIO;
608 }
609
610 static DEVICE_ATTR_RO(kernel_version);
611 static DEVICE_ATTR_RO(cpumask);
612
613 HV_CAPS_ATTR(version, "0x%x\n");
614 HV_CAPS_ATTR(ga, "%d\n");
615 HV_CAPS_ATTR(expanded, "%d\n");
616 HV_CAPS_ATTR(lab, "%d\n");
617 HV_CAPS_ATTR(collect_privileged, "%d\n");
618
619 static struct attribute *interface_attrs[] = {
620 &dev_attr_kernel_version.attr,
621 &hv_caps_attr_version.attr,
622 &hv_caps_attr_ga.attr,
623 &hv_caps_attr_expanded.attr,
624 &hv_caps_attr_lab.attr,
625 &hv_caps_attr_collect_privileged.attr,
626 /*
627 * This NULL is a placeholder for the processor_bus_topology
628 * attribute, set in init function if applicable.
629 */
630 NULL,
631 /*
632 * This NULL is a placeholder for the processor_config
633 * attribute, set in init function if applicable.
634 */
635 NULL,
636 /*
637 * This NULL is a placeholder for the affinity_domain_via_virtual_processor
638 * attribute, set in init function if applicable.
639 */
640 NULL,
641 /*
642 * This NULL is a placeholder for the affinity_domain_via_domain
643 * attribute, set in init function if applicable.
644 */
645 NULL,
646 /*
647 * This NULL is a placeholder for the affinity_domain_via_partition
648 * attribute, set in init function if applicable.
649 */
650 NULL,
651 NULL,
652 };
653
654 static struct attribute *cpumask_attrs[] = {
655 &dev_attr_cpumask.attr,
656 NULL,
657 };
658
659 static const struct attribute_group cpumask_attr_group = {
660 .attrs = cpumask_attrs,
661 };
662
663 static const struct attribute_group interface_group = {
664 .name = "interface",
665 .attrs = interface_attrs,
666 };
667
668 static const struct attribute_group *attr_groups[] = {
669 &format_group,
670 &event_group,
671 &interface_group,
672 &cpumask_attr_group,
673 NULL,
674 };
675
single_gpci_request(u32 req,u32 starting_index,u16 secondary_index,u8 version_in,u32 offset,u8 length,u64 * value)676 static unsigned long single_gpci_request(u32 req, u32 starting_index,
677 u16 secondary_index, u8 version_in, u32 offset, u8 length,
678 u64 *value)
679 {
680 unsigned long ret;
681 size_t i;
682 u64 count;
683 struct hv_gpci_request_buffer *arg;
684
685 arg = (void *)get_cpu_var(hv_gpci_reqb);
686 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
687
688 arg->params.counter_request = cpu_to_be32(req);
689 arg->params.starting_index = cpu_to_be32(starting_index);
690 arg->params.secondary_index = cpu_to_be16(secondary_index);
691 arg->params.counter_info_version_in = version_in;
692
693 ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
694 virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
695 if (ret) {
696 pr_devel("hcall failed: 0x%lx\n", ret);
697 goto out;
698 }
699
700 /*
701 * we verify offset and length are within the zeroed buffer at event
702 * init.
703 */
704 count = 0;
705 for (i = offset; i < offset + length; i++)
706 count |= (u64)(arg->bytes[i]) << ((length - 1 - (i - offset)) * 8);
707
708 *value = count;
709 out:
710 put_cpu_var(hv_gpci_reqb);
711 return ret;
712 }
713
h_gpci_get_value(struct perf_event * event)714 static u64 h_gpci_get_value(struct perf_event *event)
715 {
716 u64 count;
717 unsigned long ret = single_gpci_request(event_get_request(event),
718 event_get_starting_index(event),
719 event_get_secondary_index(event),
720 event_get_counter_info_version(event),
721 event_get_offset(event),
722 event_get_length(event),
723 &count);
724 if (ret)
725 return 0;
726 return count;
727 }
728
h_gpci_event_update(struct perf_event * event)729 static void h_gpci_event_update(struct perf_event *event)
730 {
731 s64 prev;
732 u64 now = h_gpci_get_value(event);
733 prev = local64_xchg(&event->hw.prev_count, now);
734 local64_add(now - prev, &event->count);
735 }
736
h_gpci_event_start(struct perf_event * event,int flags)737 static void h_gpci_event_start(struct perf_event *event, int flags)
738 {
739 local64_set(&event->hw.prev_count, h_gpci_get_value(event));
740 }
741
h_gpci_event_stop(struct perf_event * event,int flags)742 static void h_gpci_event_stop(struct perf_event *event, int flags)
743 {
744 h_gpci_event_update(event);
745 }
746
h_gpci_event_add(struct perf_event * event,int flags)747 static int h_gpci_event_add(struct perf_event *event, int flags)
748 {
749 if (flags & PERF_EF_START)
750 h_gpci_event_start(event, flags);
751
752 return 0;
753 }
754
h_gpci_event_init(struct perf_event * event)755 static int h_gpci_event_init(struct perf_event *event)
756 {
757 u64 count;
758 u8 length;
759
760 /* Not our event */
761 if (event->attr.type != event->pmu->type)
762 return -ENOENT;
763
764 /* config2 is unused */
765 if (event->attr.config2) {
766 pr_devel("config2 set when reserved\n");
767 return -EINVAL;
768 }
769
770 /* no branch sampling */
771 if (has_branch_stack(event))
772 return -EOPNOTSUPP;
773
774 length = event_get_length(event);
775 if (length < 1 || length > 8) {
776 pr_devel("length invalid\n");
777 return -EINVAL;
778 }
779
780 /* last byte within the buffer? */
781 if ((event_get_offset(event) + length) > HGPCI_MAX_DATA_BYTES) {
782 pr_devel("request outside of buffer: %zu > %zu\n",
783 (size_t)event_get_offset(event) + length,
784 HGPCI_MAX_DATA_BYTES);
785 return -EINVAL;
786 }
787
788 /* check if the request works... */
789 if (single_gpci_request(event_get_request(event),
790 event_get_starting_index(event),
791 event_get_secondary_index(event),
792 event_get_counter_info_version(event),
793 event_get_offset(event),
794 length,
795 &count)) {
796 pr_devel("gpci hcall failed\n");
797 return -EINVAL;
798 }
799
800 return 0;
801 }
802
803 static struct pmu h_gpci_pmu = {
804 .task_ctx_nr = perf_invalid_context,
805
806 .name = "hv_gpci",
807 .attr_groups = attr_groups,
808 .event_init = h_gpci_event_init,
809 .add = h_gpci_event_add,
810 .del = h_gpci_event_stop,
811 .start = h_gpci_event_start,
812 .stop = h_gpci_event_stop,
813 .read = h_gpci_event_update,
814 .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
815 };
816
ppc_hv_gpci_cpu_online(unsigned int cpu)817 static int ppc_hv_gpci_cpu_online(unsigned int cpu)
818 {
819 if (cpumask_empty(&hv_gpci_cpumask))
820 cpumask_set_cpu(cpu, &hv_gpci_cpumask);
821
822 return 0;
823 }
824
ppc_hv_gpci_cpu_offline(unsigned int cpu)825 static int ppc_hv_gpci_cpu_offline(unsigned int cpu)
826 {
827 int target;
828
829 /* Check if exiting cpu is used for collecting gpci events */
830 if (!cpumask_test_and_clear_cpu(cpu, &hv_gpci_cpumask))
831 return 0;
832
833 /* Find a new cpu to collect gpci events */
834 target = cpumask_last(cpu_active_mask);
835
836 if (target < 0 || target >= nr_cpu_ids) {
837 pr_err("hv_gpci: CPU hotplug init failed\n");
838 return -1;
839 }
840
841 /* Migrate gpci events to the new target */
842 cpumask_set_cpu(target, &hv_gpci_cpumask);
843 perf_pmu_migrate_context(&h_gpci_pmu, cpu, target);
844
845 return 0;
846 }
847
hv_gpci_cpu_hotplug_init(void)848 static int hv_gpci_cpu_hotplug_init(void)
849 {
850 return cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
851 "perf/powerpc/hv_gcpi:online",
852 ppc_hv_gpci_cpu_online,
853 ppc_hv_gpci_cpu_offline);
854 }
855
sysinfo_device_attr_create(int sysinfo_interface_group_index,u32 req)856 static struct device_attribute *sysinfo_device_attr_create(int
857 sysinfo_interface_group_index, u32 req)
858 {
859 struct device_attribute *attr = NULL;
860 unsigned long ret;
861 struct hv_gpci_request_buffer *arg;
862
863 if (sysinfo_interface_group_index < INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR ||
864 sysinfo_interface_group_index >= INTERFACE_NULL_ATTR) {
865 pr_info("Wrong interface group index for system information\n");
866 return NULL;
867 }
868
869 /* Check for given counter request value support */
870 arg = (void *)get_cpu_var(hv_gpci_reqb);
871 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
872
873 arg->params.counter_request = cpu_to_be32(req);
874
875 ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
876 virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
877
878 put_cpu_var(hv_gpci_reqb);
879
880 /*
881 * Add given counter request value attribute in the interface_attrs
882 * attribute array, only for valid return types.
883 */
884 if (!ret || ret == H_AUTHORITY || ret == H_PARAMETER) {
885 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
886 if (!attr)
887 return NULL;
888
889 sysfs_attr_init(&attr->attr);
890 attr->attr.mode = 0444;
891
892 switch (sysinfo_interface_group_index) {
893 case INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR:
894 attr->attr.name = "processor_bus_topology";
895 attr->show = processor_bus_topology_show;
896 break;
897 case INTERFACE_PROCESSOR_CONFIG_ATTR:
898 attr->attr.name = "processor_config";
899 attr->show = processor_config_show;
900 break;
901 case INTERFACE_AFFINITY_DOMAIN_VIA_VP_ATTR:
902 attr->attr.name = "affinity_domain_via_virtual_processor";
903 attr->show = affinity_domain_via_virtual_processor_show;
904 break;
905 case INTERFACE_AFFINITY_DOMAIN_VIA_DOM_ATTR:
906 attr->attr.name = "affinity_domain_via_domain";
907 attr->show = affinity_domain_via_domain_show;
908 break;
909 case INTERFACE_AFFINITY_DOMAIN_VIA_PAR_ATTR:
910 attr->attr.name = "affinity_domain_via_partition";
911 attr->show = affinity_domain_via_partition_show;
912 break;
913 }
914 } else
915 pr_devel("hcall failed, with error: 0x%lx\n", ret);
916
917 return attr;
918 }
919
add_sysinfo_interface_files(void)920 static void add_sysinfo_interface_files(void)
921 {
922 int sysfs_count;
923 struct device_attribute *attr[INTERFACE_NULL_ATTR - INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR];
924 int i;
925
926 sysfs_count = INTERFACE_NULL_ATTR - INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR;
927
928 /* Get device attribute for a given counter request value */
929 for (i = 0; i < sysfs_count; i++) {
930 attr[i] = sysinfo_device_attr_create(i + INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR,
931 sysinfo_counter_request[i]);
932
933 if (!attr[i])
934 goto out;
935 }
936
937 /* Add sysinfo interface attributes in the interface_attrs attribute array */
938 for (i = 0; i < sysfs_count; i++)
939 interface_attrs[i + INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR] = &attr[i]->attr;
940
941 return;
942
943 out:
944 /*
945 * The sysinfo interface attributes will be added, only if hcall passed for
946 * all the counter request values. Free the device attribute array incase
947 * of any hcall failure.
948 */
949 if (i > 0) {
950 while (i >= 0) {
951 kfree(attr[i]);
952 i--;
953 }
954 }
955 }
956
hv_gpci_init(void)957 static int hv_gpci_init(void)
958 {
959 int r;
960 unsigned long hret;
961 struct hv_perf_caps caps;
962 struct hv_gpci_request_buffer *arg;
963
964 hv_gpci_assert_offsets_correct();
965
966 if (!firmware_has_feature(FW_FEATURE_LPAR)) {
967 pr_debug("not a virtualized system, not enabling\n");
968 return -ENODEV;
969 }
970
971 hret = hv_perf_caps_get(&caps);
972 if (hret) {
973 pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
974 hret);
975 return -ENODEV;
976 }
977
978 /* init cpuhotplug */
979 r = hv_gpci_cpu_hotplug_init();
980 if (r)
981 return r;
982
983 /* sampling not supported */
984 h_gpci_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
985
986 arg = (void *)get_cpu_var(hv_gpci_reqb);
987 memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
988
989 /*
990 * hcall H_GET_PERF_COUNTER_INFO populates the output
991 * counter_info_version value based on the system hypervisor.
992 * Pass the counter request 0x10 corresponds to request type
993 * 'Dispatch_timebase_by_processor', to get the supported
994 * counter_info_version.
995 */
996 arg->params.counter_request = cpu_to_be32(0x10);
997
998 r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
999 virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
1000 if (r) {
1001 pr_devel("hcall failed, can't get supported counter_info_version: 0x%x\n", r);
1002 arg->params.counter_info_version_out = 0x8;
1003 }
1004
1005 /*
1006 * Use counter_info_version_out value to assign
1007 * required hv-gpci event list.
1008 */
1009 if (arg->params.counter_info_version_out >= 0x8)
1010 event_group.attrs = hv_gpci_event_attrs;
1011 else
1012 event_group.attrs = hv_gpci_event_attrs_v6;
1013
1014 put_cpu_var(hv_gpci_reqb);
1015
1016 r = perf_pmu_register(&h_gpci_pmu, h_gpci_pmu.name, -1);
1017 if (r)
1018 return r;
1019
1020 /* sysinfo interface files are only available for power10 and above platforms */
1021 if (PVR_VER(mfspr(SPRN_PVR)) >= PVR_POWER10)
1022 add_sysinfo_interface_files();
1023
1024 return 0;
1025 }
1026
1027 device_initcall(hv_gpci_init);
1028
