1
2
3
4
5
6#include <linux/kernel.h>
7#include <linux/init.h>
8#include <linux/types.h>
9#include <linux/device.h>
10#include <linux/io.h>
11#include <linux/err.h>
12#include <linux/export.h>
13#include <linux/slab.h>
14#include <linux/stringhash.h>
15#include <linux/mutex.h>
16#include <linux/clk.h>
17#include <linux/coresight.h>
18#include <linux/of_platform.h>
19#include <linux/delay.h>
20#include <linux/pm_runtime.h>
21
22#include "coresight-etm-perf.h"
23#include "coresight-priv.h"
24
25static DEFINE_MUTEX(coresight_mutex);
26static DEFINE_PER_CPU(struct coresight_device *, csdev_sink);
27
28
29
30
31
32
33struct coresight_node {
34 struct coresight_device *csdev;
35 struct list_head link;
36};
37
38
39
40
41
42static DEFINE_PER_CPU(struct list_head *, tracer_path);
43
44
45
46
47
48
49
50static struct list_head *stm_path;
51
52
53
54
55
56
57const u32 coresight_barrier_pkt[4] = {0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff};
58EXPORT_SYMBOL_GPL(coresight_barrier_pkt);
59
60static const struct cti_assoc_op *cti_assoc_ops;
61
62void coresight_set_cti_ops(const struct cti_assoc_op *cti_op)
63{
64 cti_assoc_ops = cti_op;
65}
66EXPORT_SYMBOL_GPL(coresight_set_cti_ops);
67
68void coresight_remove_cti_ops(void)
69{
70 cti_assoc_ops = NULL;
71}
72EXPORT_SYMBOL_GPL(coresight_remove_cti_ops);
73
74void coresight_set_percpu_sink(int cpu, struct coresight_device *csdev)
75{
76 per_cpu(csdev_sink, cpu) = csdev;
77}
78EXPORT_SYMBOL_GPL(coresight_set_percpu_sink);
79
80struct coresight_device *coresight_get_percpu_sink(int cpu)
81{
82 return per_cpu(csdev_sink, cpu);
83}
84EXPORT_SYMBOL_GPL(coresight_get_percpu_sink);
85
86static int coresight_id_match(struct device *dev, void *data)
87{
88 int trace_id, i_trace_id;
89 struct coresight_device *csdev, *i_csdev;
90
91 csdev = data;
92 i_csdev = to_coresight_device(dev);
93
94
95
96
97
98 if (i_csdev == csdev || !i_csdev->enable ||
99 i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
100 return 0;
101
102
103 trace_id = source_ops(csdev)->trace_id(csdev);
104 i_trace_id = source_ops(i_csdev)->trace_id(i_csdev);
105
106
107 if (trace_id == i_trace_id)
108 return 1;
109
110 return 0;
111}
112
113static int coresight_source_is_unique(struct coresight_device *csdev)
114{
115 int trace_id = source_ops(csdev)->trace_id(csdev);
116
117
118 if (trace_id < 0)
119 return 0;
120
121 return !bus_for_each_dev(&coresight_bustype, NULL,
122 csdev, coresight_id_match);
123}
124
125static int coresight_find_link_inport(struct coresight_device *csdev,
126 struct coresight_device *parent)
127{
128 int i;
129 struct coresight_connection *conn;
130
131 for (i = 0; i < parent->pdata->nr_outport; i++) {
132 conn = &parent->pdata->conns[i];
133 if (conn->child_dev == csdev)
134 return conn->child_port;
135 }
136
137 dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
138 dev_name(&parent->dev), dev_name(&csdev->dev));
139
140 return -ENODEV;
141}
142
143static int coresight_find_link_outport(struct coresight_device *csdev,
144 struct coresight_device *child)
145{
146 int i;
147 struct coresight_connection *conn;
148
149 for (i = 0; i < csdev->pdata->nr_outport; i++) {
150 conn = &csdev->pdata->conns[i];
151 if (conn->child_dev == child)
152 return conn->outport;
153 }
154
155 dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
156 dev_name(&csdev->dev), dev_name(&child->dev));
157
158 return -ENODEV;
159}
160
161static inline u32 coresight_read_claim_tags(struct coresight_device *csdev)
162{
163 return csdev_access_relaxed_read32(&csdev->access, CORESIGHT_CLAIMCLR);
164}
165
166static inline bool coresight_is_claimed_self_hosted(struct coresight_device *csdev)
167{
168 return coresight_read_claim_tags(csdev) == CORESIGHT_CLAIM_SELF_HOSTED;
169}
170
171static inline bool coresight_is_claimed_any(struct coresight_device *csdev)
172{
173 return coresight_read_claim_tags(csdev) != 0;
174}
175
176static inline void coresight_set_claim_tags(struct coresight_device *csdev)
177{
178 csdev_access_relaxed_write32(&csdev->access, CORESIGHT_CLAIM_SELF_HOSTED,
179 CORESIGHT_CLAIMSET);
180 isb();
181}
182
183static inline void coresight_clear_claim_tags(struct coresight_device *csdev)
184{
185 csdev_access_relaxed_write32(&csdev->access, CORESIGHT_CLAIM_SELF_HOSTED,
186 CORESIGHT_CLAIMCLR);
187 isb();
188}
189
190
191
192
193
194
195
196
197
198
199
200int coresight_claim_device_unlocked(struct coresight_device *csdev)
201{
202 if (WARN_ON(!csdev))
203 return -EINVAL;
204
205 if (coresight_is_claimed_any(csdev))
206 return -EBUSY;
207
208 coresight_set_claim_tags(csdev);
209 if (coresight_is_claimed_self_hosted(csdev))
210 return 0;
211
212 coresight_clear_claim_tags(csdev);
213 return -EBUSY;
214}
215EXPORT_SYMBOL_GPL(coresight_claim_device_unlocked);
216
217int coresight_claim_device(struct coresight_device *csdev)
218{
219 int rc;
220
221 if (WARN_ON(!csdev))
222 return -EINVAL;
223
224 CS_UNLOCK(csdev->access.base);
225 rc = coresight_claim_device_unlocked(csdev);
226 CS_LOCK(csdev->access.base);
227
228 return rc;
229}
230EXPORT_SYMBOL_GPL(coresight_claim_device);
231
232
233
234
235
236void coresight_disclaim_device_unlocked(struct coresight_device *csdev)
237{
238
239 if (WARN_ON(!csdev))
240 return;
241
242 if (coresight_is_claimed_self_hosted(csdev))
243 coresight_clear_claim_tags(csdev);
244 else
245
246
247
248
249
250 WARN_ON_ONCE(1);
251}
252EXPORT_SYMBOL_GPL(coresight_disclaim_device_unlocked);
253
254void coresight_disclaim_device(struct coresight_device *csdev)
255{
256 if (WARN_ON(!csdev))
257 return;
258
259 CS_UNLOCK(csdev->access.base);
260 coresight_disclaim_device_unlocked(csdev);
261 CS_LOCK(csdev->access.base);
262}
263EXPORT_SYMBOL_GPL(coresight_disclaim_device);
264
265
266static int
267coresight_control_assoc_ectdev(struct coresight_device *csdev, bool enable)
268{
269 int ect_ret = 0;
270 struct coresight_device *ect_csdev = csdev->ect_dev;
271 struct module *mod;
272
273 if (!ect_csdev)
274 return 0;
275 if ((!ect_ops(ect_csdev)->enable) || (!ect_ops(ect_csdev)->disable))
276 return 0;
277
278 mod = ect_csdev->dev.parent->driver->owner;
279 if (enable) {
280 if (try_module_get(mod)) {
281 ect_ret = ect_ops(ect_csdev)->enable(ect_csdev);
282 if (ect_ret) {
283 module_put(mod);
284 } else {
285 get_device(ect_csdev->dev.parent);
286 csdev->ect_enabled = true;
287 }
288 } else
289 ect_ret = -ENODEV;
290 } else {
291 if (csdev->ect_enabled) {
292 ect_ret = ect_ops(ect_csdev)->disable(ect_csdev);
293 put_device(ect_csdev->dev.parent);
294 module_put(mod);
295 csdev->ect_enabled = false;
296 }
297 }
298
299
300 if (ect_ret)
301 dev_info(&csdev->dev, "Associated ECT device (%s) %s failed\n",
302 dev_name(&ect_csdev->dev),
303 enable ? "enable" : "disable");
304 return ect_ret;
305}
306
307
308
309
310
311void coresight_set_assoc_ectdev_mutex(struct coresight_device *csdev,
312 struct coresight_device *ect_csdev)
313{
314 mutex_lock(&coresight_mutex);
315 csdev->ect_dev = ect_csdev;
316 mutex_unlock(&coresight_mutex);
317}
318EXPORT_SYMBOL_GPL(coresight_set_assoc_ectdev_mutex);
319
320static int coresight_enable_sink(struct coresight_device *csdev,
321 u32 mode, void *data)
322{
323 int ret;
324
325
326
327
328
329 if (!sink_ops(csdev)->enable)
330 return -EINVAL;
331
332 ret = coresight_control_assoc_ectdev(csdev, true);
333 if (ret)
334 return ret;
335 ret = sink_ops(csdev)->enable(csdev, mode, data);
336 if (ret) {
337 coresight_control_assoc_ectdev(csdev, false);
338 return ret;
339 }
340 csdev->enable = true;
341
342 return 0;
343}
344
345static void coresight_disable_sink(struct coresight_device *csdev)
346{
347 int ret;
348
349 if (!sink_ops(csdev)->disable)
350 return;
351
352 ret = sink_ops(csdev)->disable(csdev);
353 if (ret)
354 return;
355 coresight_control_assoc_ectdev(csdev, false);
356 csdev->enable = false;
357}
358
359static int coresight_enable_link(struct coresight_device *csdev,
360 struct coresight_device *parent,
361 struct coresight_device *child)
362{
363 int ret = 0;
364 int link_subtype;
365 int inport, outport;
366
367 if (!parent || !child)
368 return -EINVAL;
369
370 inport = coresight_find_link_inport(csdev, parent);
371 outport = coresight_find_link_outport(csdev, child);
372 link_subtype = csdev->subtype.link_subtype;
373
374 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG && inport < 0)
375 return inport;
376 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT && outport < 0)
377 return outport;
378
379 if (link_ops(csdev)->enable) {
380 ret = coresight_control_assoc_ectdev(csdev, true);
381 if (!ret) {
382 ret = link_ops(csdev)->enable(csdev, inport, outport);
383 if (ret)
384 coresight_control_assoc_ectdev(csdev, false);
385 }
386 }
387
388 if (!ret)
389 csdev->enable = true;
390
391 return ret;
392}
393
394static void coresight_disable_link(struct coresight_device *csdev,
395 struct coresight_device *parent,
396 struct coresight_device *child)
397{
398 int i, nr_conns;
399 int link_subtype;
400 int inport, outport;
401
402 if (!parent || !child)
403 return;
404
405 inport = coresight_find_link_inport(csdev, parent);
406 outport = coresight_find_link_outport(csdev, child);
407 link_subtype = csdev->subtype.link_subtype;
408
409 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
410 nr_conns = csdev->pdata->nr_inport;
411 } else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
412 nr_conns = csdev->pdata->nr_outport;
413 } else {
414 nr_conns = 1;
415 }
416
417 if (link_ops(csdev)->disable) {
418 link_ops(csdev)->disable(csdev, inport, outport);
419 coresight_control_assoc_ectdev(csdev, false);
420 }
421
422 for (i = 0; i < nr_conns; i++)
423 if (atomic_read(&csdev->refcnt[i]) != 0)
424 return;
425
426 csdev->enable = false;
427}
428
429static int coresight_enable_source(struct coresight_device *csdev, u32 mode)
430{
431 int ret;
432
433 if (!coresight_source_is_unique(csdev)) {
434 dev_warn(&csdev->dev, "traceID %d not unique\n",
435 source_ops(csdev)->trace_id(csdev));
436 return -EINVAL;
437 }
438
439 if (!csdev->enable) {
440 if (source_ops(csdev)->enable) {
441 ret = coresight_control_assoc_ectdev(csdev, true);
442 if (ret)
443 return ret;
444 ret = source_ops(csdev)->enable(csdev, NULL, mode);
445 if (ret) {
446 coresight_control_assoc_ectdev(csdev, false);
447 return ret;
448 }
449 }
450 csdev->enable = true;
451 }
452
453 atomic_inc(csdev->refcnt);
454
455 return 0;
456}
457
458
459
460
461
462
463
464
465
466static bool coresight_disable_source(struct coresight_device *csdev)
467{
468 if (atomic_dec_return(csdev->refcnt) == 0) {
469 if (source_ops(csdev)->disable)
470 source_ops(csdev)->disable(csdev, NULL);
471 coresight_control_assoc_ectdev(csdev, false);
472 csdev->enable = false;
473 }
474 return !csdev->enable;
475}
476
477
478
479
480
481
482static void coresight_disable_path_from(struct list_head *path,
483 struct coresight_node *nd)
484{
485 u32 type;
486 struct coresight_device *csdev, *parent, *child;
487
488 if (!nd)
489 nd = list_first_entry(path, struct coresight_node, link);
490
491 list_for_each_entry_continue(nd, path, link) {
492 csdev = nd->csdev;
493 type = csdev->type;
494
495
496
497
498
499
500
501 if (type == CORESIGHT_DEV_TYPE_LINKSINK)
502 type = (csdev == coresight_get_sink(path)) ?
503 CORESIGHT_DEV_TYPE_SINK :
504 CORESIGHT_DEV_TYPE_LINK;
505
506 switch (type) {
507 case CORESIGHT_DEV_TYPE_SINK:
508 coresight_disable_sink(csdev);
509 break;
510 case CORESIGHT_DEV_TYPE_SOURCE:
511
512
513
514
515
516 WARN_ON(1);
517 break;
518 case CORESIGHT_DEV_TYPE_LINK:
519 parent = list_prev_entry(nd, link)->csdev;
520 child = list_next_entry(nd, link)->csdev;
521 coresight_disable_link(csdev, parent, child);
522 break;
523 default:
524 break;
525 }
526 }
527}
528
529void coresight_disable_path(struct list_head *path)
530{
531 coresight_disable_path_from(path, NULL);
532}
533EXPORT_SYMBOL_GPL(coresight_disable_path);
534
535int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data)
536{
537
538 int ret = 0;
539 u32 type;
540 struct coresight_node *nd;
541 struct coresight_device *csdev, *parent, *child;
542
543 list_for_each_entry_reverse(nd, path, link) {
544 csdev = nd->csdev;
545 type = csdev->type;
546
547
548
549
550
551
552
553 if (type == CORESIGHT_DEV_TYPE_LINKSINK)
554 type = (csdev == coresight_get_sink(path)) ?
555 CORESIGHT_DEV_TYPE_SINK :
556 CORESIGHT_DEV_TYPE_LINK;
557
558 switch (type) {
559 case CORESIGHT_DEV_TYPE_SINK:
560 ret = coresight_enable_sink(csdev, mode, sink_data);
561
562
563
564
565
566
567 if (ret)
568 goto out;
569 break;
570 case CORESIGHT_DEV_TYPE_SOURCE:
571
572 break;
573 case CORESIGHT_DEV_TYPE_LINK:
574 parent = list_prev_entry(nd, link)->csdev;
575 child = list_next_entry(nd, link)->csdev;
576 ret = coresight_enable_link(csdev, parent, child);
577 if (ret)
578 goto err;
579 break;
580 default:
581 goto err;
582 }
583 }
584
585out:
586 return ret;
587err:
588 coresight_disable_path_from(path, nd);
589 goto out;
590}
591
592struct coresight_device *coresight_get_sink(struct list_head *path)
593{
594 struct coresight_device *csdev;
595
596 if (!path)
597 return NULL;
598
599 csdev = list_last_entry(path, struct coresight_node, link)->csdev;
600 if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
601 csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
602 return NULL;
603
604 return csdev;
605}
606
607static struct coresight_device *
608coresight_find_enabled_sink(struct coresight_device *csdev)
609{
610 int i;
611 struct coresight_device *sink = NULL;
612
613 if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
614 csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
615 csdev->activated)
616 return csdev;
617
618
619
620
621 for (i = 0; i < csdev->pdata->nr_outport; i++) {
622 struct coresight_device *child_dev;
623
624 child_dev = csdev->pdata->conns[i].child_dev;
625 if (child_dev)
626 sink = coresight_find_enabled_sink(child_dev);
627 if (sink)
628 return sink;
629 }
630
631 return NULL;
632}
633
634
635
636
637
638
639
640struct coresight_device *
641coresight_get_enabled_sink(struct coresight_device *source)
642{
643 if (!source)
644 return NULL;
645
646 return coresight_find_enabled_sink(source);
647}
648
649static int coresight_sink_by_id(struct device *dev, const void *data)
650{
651 struct coresight_device *csdev = to_coresight_device(dev);
652 unsigned long hash;
653
654 if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
655 csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) {
656
657 if (!csdev->ea)
658 return 0;
659
660
661
662
663 hash = (unsigned long)csdev->ea->var;
664
665 if ((u32)hash == *(u32 *)data)
666 return 1;
667 }
668
669 return 0;
670}
671
672
673
674
675
676
677
678
679
680struct coresight_device *coresight_get_sink_by_id(u32 id)
681{
682 struct device *dev = NULL;
683
684 dev = bus_find_device(&coresight_bustype, NULL, &id,
685 coresight_sink_by_id);
686
687 return dev ? to_coresight_device(dev) : NULL;
688}
689
690
691
692
693
694
695
696
697
698
699static inline bool coresight_get_ref(struct coresight_device *csdev)
700{
701 struct device *dev = csdev->dev.parent;
702
703
704 if (!try_module_get(dev->driver->owner))
705 return false;
706
707 get_device(dev);
708 pm_runtime_get_sync(dev);
709 return true;
710}
711
712
713
714
715
716
717
718static inline void coresight_put_ref(struct coresight_device *csdev)
719{
720 struct device *dev = csdev->dev.parent;
721
722 pm_runtime_put(dev);
723 put_device(dev);
724 module_put(dev->driver->owner);
725}
726
727
728
729
730
731
732
733static int coresight_grab_device(struct coresight_device *csdev)
734{
735 int i;
736
737 for (i = 0; i < csdev->pdata->nr_outport; i++) {
738 struct coresight_device *child;
739
740 child = csdev->pdata->conns[i].child_dev;
741 if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
742 if (!coresight_get_ref(child))
743 goto err;
744 }
745 if (coresight_get_ref(csdev))
746 return 0;
747err:
748 for (i--; i >= 0; i--) {
749 struct coresight_device *child;
750
751 child = csdev->pdata->conns[i].child_dev;
752 if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
753 coresight_put_ref(child);
754 }
755 return -ENODEV;
756}
757
758
759
760
761
762static void coresight_drop_device(struct coresight_device *csdev)
763{
764 int i;
765
766 coresight_put_ref(csdev);
767 for (i = 0; i < csdev->pdata->nr_outport; i++) {
768 struct coresight_device *child;
769
770 child = csdev->pdata->conns[i].child_dev;
771 if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
772 coresight_put_ref(child);
773 }
774}
775
776
777
778
779
780
781
782
783
784
785
786
787
788static int _coresight_build_path(struct coresight_device *csdev,
789 struct coresight_device *sink,
790 struct list_head *path)
791{
792 int i, ret;
793 bool found = false;
794 struct coresight_node *node;
795
796
797 if (csdev == sink)
798 goto out;
799
800 if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
801 sink == per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev))) {
802 if (_coresight_build_path(sink, sink, path) == 0) {
803 found = true;
804 goto out;
805 }
806 }
807
808
809 for (i = 0; i < csdev->pdata->nr_outport; i++) {
810 struct coresight_device *child_dev;
811
812 child_dev = csdev->pdata->conns[i].child_dev;
813 if (child_dev &&
814 _coresight_build_path(child_dev, sink, path) == 0) {
815 found = true;
816 break;
817 }
818 }
819
820 if (!found)
821 return -ENODEV;
822
823out:
824
825
826
827
828
829
830 ret = coresight_grab_device(csdev);
831 if (ret)
832 return ret;
833
834 node = kzalloc(sizeof(struct coresight_node), GFP_KERNEL);
835 if (!node)
836 return -ENOMEM;
837
838 node->csdev = csdev;
839 list_add(&node->link, path);
840
841 return 0;
842}
843
844struct list_head *coresight_build_path(struct coresight_device *source,
845 struct coresight_device *sink)
846{
847 struct list_head *path;
848 int rc;
849
850 if (!sink)
851 return ERR_PTR(-EINVAL);
852
853 path = kzalloc(sizeof(struct list_head), GFP_KERNEL);
854 if (!path)
855 return ERR_PTR(-ENOMEM);
856
857 INIT_LIST_HEAD(path);
858
859 rc = _coresight_build_path(source, sink, path);
860 if (rc) {
861 kfree(path);
862 return ERR_PTR(rc);
863 }
864
865 return path;
866}
867
868
869
870
871
872
873
874
875void coresight_release_path(struct list_head *path)
876{
877 struct coresight_device *csdev;
878 struct coresight_node *nd, *next;
879
880 list_for_each_entry_safe(nd, next, path, link) {
881 csdev = nd->csdev;
882
883 coresight_drop_device(csdev);
884 list_del(&nd->link);
885 kfree(nd);
886 }
887
888 kfree(path);
889}
890
891
892static inline bool coresight_is_def_sink_type(struct coresight_device *csdev)
893{
894
895 if (((csdev->type == CORESIGHT_DEV_TYPE_SINK) ||
896 (csdev->type == CORESIGHT_DEV_TYPE_LINKSINK)) &&
897 (csdev->subtype.sink_subtype >= CORESIGHT_DEV_SUBTYPE_SINK_BUFFER))
898 return true;
899 return false;
900}
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919static struct coresight_device *
920coresight_select_best_sink(struct coresight_device *sink, int *depth,
921 struct coresight_device *new_sink, int new_depth)
922{
923 bool update = false;
924
925 if (!sink) {
926
927 update = true;
928 } else if (new_sink->subtype.sink_subtype >
929 sink->subtype.sink_subtype) {
930
931 update = true;
932 } else if ((new_sink->subtype.sink_subtype ==
933 sink->subtype.sink_subtype) &&
934 (*depth > new_depth)) {
935
936 update = true;
937 }
938
939 if (update)
940 *depth = new_depth;
941 return update ? new_sink : sink;
942}
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960static struct coresight_device *
961coresight_find_sink(struct coresight_device *csdev, int *depth)
962{
963 int i, curr_depth = *depth + 1, found_depth = 0;
964 struct coresight_device *found_sink = NULL;
965
966 if (coresight_is_def_sink_type(csdev)) {
967 found_depth = curr_depth;
968 found_sink = csdev;
969 if (csdev->type == CORESIGHT_DEV_TYPE_SINK)
970 goto return_def_sink;
971
972 }
973
974
975
976
977
978 for (i = 0; i < csdev->pdata->nr_outport; i++) {
979 struct coresight_device *child_dev, *sink = NULL;
980 int child_depth = curr_depth;
981
982 child_dev = csdev->pdata->conns[i].child_dev;
983 if (child_dev)
984 sink = coresight_find_sink(child_dev, &child_depth);
985
986 if (sink)
987 found_sink = coresight_select_best_sink(found_sink,
988 &found_depth,
989 sink,
990 child_depth);
991 }
992
993return_def_sink:
994
995 if (found_sink)
996 *depth = found_depth;
997 return found_sink;
998}
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016struct coresight_device *
1017coresight_find_default_sink(struct coresight_device *csdev)
1018{
1019 int depth = 0;
1020
1021
1022 if (!csdev->def_sink) {
1023 if (coresight_is_percpu_source(csdev))
1024 csdev->def_sink = per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev));
1025 if (!csdev->def_sink)
1026 csdev->def_sink = coresight_find_sink(csdev, &depth);
1027 }
1028 return csdev->def_sink;
1029}
1030
1031static int coresight_remove_sink_ref(struct device *dev, void *data)
1032{
1033 struct coresight_device *sink = data;
1034 struct coresight_device *source = to_coresight_device(dev);
1035
1036 if (source->def_sink == sink)
1037 source->def_sink = NULL;
1038 return 0;
1039}
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051static void coresight_clear_default_sink(struct coresight_device *csdev)
1052{
1053 if ((csdev->type == CORESIGHT_DEV_TYPE_SINK) ||
1054 (csdev->type == CORESIGHT_DEV_TYPE_LINKSINK)) {
1055 bus_for_each_dev(&coresight_bustype, NULL, csdev,
1056 coresight_remove_sink_ref);
1057 }
1058}
1059
1060
1061
1062
1063
1064
1065
1066static int coresight_validate_source(struct coresight_device *csdev,
1067 const char *function)
1068{
1069 u32 type, subtype;
1070
1071 type = csdev->type;
1072 subtype = csdev->subtype.source_subtype;
1073
1074 if (type != CORESIGHT_DEV_TYPE_SOURCE) {
1075 dev_err(&csdev->dev, "wrong device type in %s\n", function);
1076 return -EINVAL;
1077 }
1078
1079 if (subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_PROC &&
1080 subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE) {
1081 dev_err(&csdev->dev, "wrong device subtype in %s\n", function);
1082 return -EINVAL;
1083 }
1084
1085 return 0;
1086}
1087
1088int coresight_enable(struct coresight_device *csdev)
1089{
1090 int cpu, ret = 0;
1091 struct coresight_device *sink;
1092 struct list_head *path;
1093 enum coresight_dev_subtype_source subtype;
1094
1095 subtype = csdev->subtype.source_subtype;
1096
1097 mutex_lock(&coresight_mutex);
1098
1099 ret = coresight_validate_source(csdev, __func__);
1100 if (ret)
1101 goto out;
1102
1103 if (csdev->enable) {
1104
1105
1106
1107
1108
1109 if (subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE)
1110 atomic_inc(csdev->refcnt);
1111 goto out;
1112 }
1113
1114 sink = coresight_get_enabled_sink(csdev);
1115 if (!sink) {
1116 ret = -EINVAL;
1117 goto out;
1118 }
1119
1120 path = coresight_build_path(csdev, sink);
1121 if (IS_ERR(path)) {
1122 pr_err("building path(s) failed\n");
1123 ret = PTR_ERR(path);
1124 goto out;
1125 }
1126
1127 ret = coresight_enable_path(path, CS_MODE_SYSFS, NULL);
1128 if (ret)
1129 goto err_path;
1130
1131 ret = coresight_enable_source(csdev, CS_MODE_SYSFS);
1132 if (ret)
1133 goto err_source;
1134
1135 switch (subtype) {
1136 case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
1137
1138
1139
1140
1141
1142
1143
1144 cpu = source_ops(csdev)->cpu_id(csdev);
1145 per_cpu(tracer_path, cpu) = path;
1146 break;
1147 case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
1148 stm_path = path;
1149 break;
1150 default:
1151
1152 break;
1153 }
1154
1155out:
1156 mutex_unlock(&coresight_mutex);
1157 return ret;
1158
1159err_source:
1160 coresight_disable_path(path);
1161
1162err_path:
1163 coresight_release_path(path);
1164 goto out;
1165}
1166EXPORT_SYMBOL_GPL(coresight_enable);
1167
1168void coresight_disable(struct coresight_device *csdev)
1169{
1170 int cpu, ret;
1171 struct list_head *path = NULL;
1172
1173 mutex_lock(&coresight_mutex);
1174
1175 ret = coresight_validate_source(csdev, __func__);
1176 if (ret)
1177 goto out;
1178
1179 if (!csdev->enable || !coresight_disable_source(csdev))
1180 goto out;
1181
1182 switch (csdev->subtype.source_subtype) {
1183 case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
1184 cpu = source_ops(csdev)->cpu_id(csdev);
1185 path = per_cpu(tracer_path, cpu);
1186 per_cpu(tracer_path, cpu) = NULL;
1187 break;
1188 case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
1189 path = stm_path;
1190 stm_path = NULL;
1191 break;
1192 default:
1193
1194 break;
1195 }
1196
1197 coresight_disable_path(path);
1198 coresight_release_path(path);
1199
1200out:
1201 mutex_unlock(&coresight_mutex);
1202}
1203EXPORT_SYMBOL_GPL(coresight_disable);
1204
1205static ssize_t enable_sink_show(struct device *dev,
1206 struct device_attribute *attr, char *buf)
1207{
1208 struct coresight_device *csdev = to_coresight_device(dev);
1209
1210 return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->activated);
1211}
1212
1213static ssize_t enable_sink_store(struct device *dev,
1214 struct device_attribute *attr,
1215 const char *buf, size_t size)
1216{
1217 int ret;
1218 unsigned long val;
1219 struct coresight_device *csdev = to_coresight_device(dev);
1220
1221 ret = kstrtoul(buf, 10, &val);
1222 if (ret)
1223 return ret;
1224
1225 if (val)
1226 csdev->activated = true;
1227 else
1228 csdev->activated = false;
1229
1230 return size;
1231
1232}
1233static DEVICE_ATTR_RW(enable_sink);
1234
1235static ssize_t enable_source_show(struct device *dev,
1236 struct device_attribute *attr, char *buf)
1237{
1238 struct coresight_device *csdev = to_coresight_device(dev);
1239
1240 return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->enable);
1241}
1242
1243static ssize_t enable_source_store(struct device *dev,
1244 struct device_attribute *attr,
1245 const char *buf, size_t size)
1246{
1247 int ret = 0;
1248 unsigned long val;
1249 struct coresight_device *csdev = to_coresight_device(dev);
1250
1251 ret = kstrtoul(buf, 10, &val);
1252 if (ret)
1253 return ret;
1254
1255 if (val) {
1256 ret = coresight_enable(csdev);
1257 if (ret)
1258 return ret;
1259 } else {
1260 coresight_disable(csdev);
1261 }
1262
1263 return size;
1264}
1265static DEVICE_ATTR_RW(enable_source);
1266
1267static struct attribute *coresight_sink_attrs[] = {
1268 &dev_attr_enable_sink.attr,
1269 NULL,
1270};
1271ATTRIBUTE_GROUPS(coresight_sink);
1272
1273static struct attribute *coresight_source_attrs[] = {
1274 &dev_attr_enable_source.attr,
1275 NULL,
1276};
1277ATTRIBUTE_GROUPS(coresight_source);
1278
1279static struct device_type coresight_dev_type[] = {
1280 {
1281 .name = "none",
1282 },
1283 {
1284 .name = "sink",
1285 .groups = coresight_sink_groups,
1286 },
1287 {
1288 .name = "link",
1289 },
1290 {
1291 .name = "linksink",
1292 .groups = coresight_sink_groups,
1293 },
1294 {
1295 .name = "source",
1296 .groups = coresight_source_groups,
1297 },
1298 {
1299 .name = "helper",
1300 },
1301 {
1302 .name = "ect",
1303 },
1304};
1305
1306static void coresight_device_release(struct device *dev)
1307{
1308 struct coresight_device *csdev = to_coresight_device(dev);
1309
1310 fwnode_handle_put(csdev->dev.fwnode);
1311 kfree(csdev->refcnt);
1312 kfree(csdev);
1313}
1314
1315static int coresight_orphan_match(struct device *dev, void *data)
1316{
1317 int i, ret = 0;
1318 bool still_orphan = false;
1319 struct coresight_device *csdev, *i_csdev;
1320 struct coresight_connection *conn;
1321
1322 csdev = data;
1323 i_csdev = to_coresight_device(dev);
1324
1325
1326 if (csdev == i_csdev)
1327 return 0;
1328
1329
1330 if (!i_csdev->orphan)
1331 return 0;
1332
1333
1334
1335
1336 for (i = 0; i < i_csdev->pdata->nr_outport; i++) {
1337 conn = &i_csdev->pdata->conns[i];
1338
1339
1340 if (!conn->child_fwnode)
1341 continue;
1342
1343 if (conn->child_dev == NULL) {
1344
1345 if (conn->child_fwnode == csdev->dev.fwnode) {
1346 ret = coresight_make_links(i_csdev,
1347 conn, csdev);
1348 if (ret)
1349 return ret;
1350 } else {
1351
1352 still_orphan = true;
1353 }
1354 }
1355 }
1356
1357 i_csdev->orphan = still_orphan;
1358
1359
1360
1361
1362
1363 return 0;
1364}
1365
1366static int coresight_fixup_orphan_conns(struct coresight_device *csdev)
1367{
1368 return bus_for_each_dev(&coresight_bustype, NULL,
1369 csdev, coresight_orphan_match);
1370}
1371
1372
1373static int coresight_fixup_device_conns(struct coresight_device *csdev)
1374{
1375 int i, ret = 0;
1376
1377 for (i = 0; i < csdev->pdata->nr_outport; i++) {
1378 struct coresight_connection *conn = &csdev->pdata->conns[i];
1379
1380 if (!conn->child_fwnode)
1381 continue;
1382 conn->child_dev =
1383 coresight_find_csdev_by_fwnode(conn->child_fwnode);
1384 if (conn->child_dev) {
1385 ret = coresight_make_links(csdev, conn,
1386 conn->child_dev);
1387 if (ret)
1388 break;
1389 } else {
1390 csdev->orphan = true;
1391 }
1392 }
1393
1394 return ret;
1395}
1396
1397static int coresight_remove_match(struct device *dev, void *data)
1398{
1399 int i;
1400 struct coresight_device *csdev, *iterator;
1401 struct coresight_connection *conn;
1402
1403 csdev = data;
1404 iterator = to_coresight_device(dev);
1405
1406
1407 if (csdev == iterator)
1408 return 0;
1409
1410
1411
1412
1413
1414 for (i = 0; i < iterator->pdata->nr_outport; i++) {
1415 conn = &iterator->pdata->conns[i];
1416
1417 if (conn->child_dev == NULL || conn->child_fwnode == NULL)
1418 continue;
1419
1420 if (csdev->dev.fwnode == conn->child_fwnode) {
1421 iterator->orphan = true;
1422 coresight_remove_links(iterator, conn);
1423
1424
1425
1426
1427
1428 fwnode_handle_put(conn->child_fwnode);
1429
1430 break;
1431 }
1432 }
1433
1434
1435
1436
1437
1438 return 0;
1439}
1440
1441
1442
1443
1444
1445static void coresight_remove_conns(struct coresight_device *csdev)
1446{
1447
1448
1449
1450
1451
1452
1453 if (csdev->pdata->nr_inport)
1454 bus_for_each_dev(&coresight_bustype, NULL,
1455 csdev, coresight_remove_match);
1456}
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469int coresight_timeout(struct csdev_access *csa, u32 offset,
1470 int position, int value)
1471{
1472 int i;
1473 u32 val;
1474
1475 for (i = TIMEOUT_US; i > 0; i--) {
1476 val = csdev_access_read32(csa, offset);
1477
1478 if (value) {
1479 if (val & BIT(position))
1480 return 0;
1481
1482 } else {
1483 if (!(val & BIT(position)))
1484 return 0;
1485 }
1486
1487
1488
1489
1490
1491
1492 if (i - 1)
1493 udelay(1);
1494 }
1495
1496 return -EAGAIN;
1497}
1498EXPORT_SYMBOL_GPL(coresight_timeout);
1499
1500u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset)
1501{
1502 return csdev_access_relaxed_read32(&csdev->access, offset);
1503}
1504
1505u32 coresight_read32(struct coresight_device *csdev, u32 offset)
1506{
1507 return csdev_access_read32(&csdev->access, offset);
1508}
1509
1510void coresight_relaxed_write32(struct coresight_device *csdev,
1511 u32 val, u32 offset)
1512{
1513 csdev_access_relaxed_write32(&csdev->access, val, offset);
1514}
1515
1516void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset)
1517{
1518 csdev_access_write32(&csdev->access, val, offset);
1519}
1520
1521u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset)
1522{
1523 return csdev_access_relaxed_read64(&csdev->access, offset);
1524}
1525
1526u64 coresight_read64(struct coresight_device *csdev, u32 offset)
1527{
1528 return csdev_access_read64(&csdev->access, offset);
1529}
1530
1531void coresight_relaxed_write64(struct coresight_device *csdev,
1532 u64 val, u32 offset)
1533{
1534 csdev_access_relaxed_write64(&csdev->access, val, offset);
1535}
1536
1537void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
1538{
1539 csdev_access_write64(&csdev->access, val, offset);
1540}
1541
1542
1543
1544
1545
1546void coresight_release_platform_data(struct coresight_device *csdev,
1547 struct coresight_platform_data *pdata)
1548{
1549 int i;
1550 struct coresight_connection *conns = pdata->conns;
1551
1552 for (i = 0; i < pdata->nr_outport; i++) {
1553
1554 if (csdev && conns[i].child_dev)
1555 coresight_remove_links(csdev, &conns[i]);
1556
1557
1558
1559
1560 if (conns[i].child_fwnode) {
1561 fwnode_handle_put(conns[i].child_fwnode);
1562 pdata->conns[i].child_fwnode = NULL;
1563 }
1564 }
1565 if (csdev)
1566 coresight_remove_conns_sysfs_group(csdev);
1567}
1568
1569struct coresight_device *coresight_register(struct coresight_desc *desc)
1570{
1571 int ret;
1572 int link_subtype;
1573 int nr_refcnts = 1;
1574 atomic_t *refcnts = NULL;
1575 struct coresight_device *csdev;
1576
1577 csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
1578 if (!csdev) {
1579 ret = -ENOMEM;
1580 goto err_out;
1581 }
1582
1583 if (desc->type == CORESIGHT_DEV_TYPE_LINK ||
1584 desc->type == CORESIGHT_DEV_TYPE_LINKSINK) {
1585 link_subtype = desc->subtype.link_subtype;
1586
1587 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
1588 nr_refcnts = desc->pdata->nr_inport;
1589 else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
1590 nr_refcnts = desc->pdata->nr_outport;
1591 }
1592
1593 refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
1594 if (!refcnts) {
1595 ret = -ENOMEM;
1596 goto err_free_csdev;
1597 }
1598
1599 csdev->refcnt = refcnts;
1600
1601 csdev->pdata = desc->pdata;
1602
1603 csdev->type = desc->type;
1604 csdev->subtype = desc->subtype;
1605 csdev->ops = desc->ops;
1606 csdev->access = desc->access;
1607 csdev->orphan = false;
1608
1609 csdev->dev.type = &coresight_dev_type[desc->type];
1610 csdev->dev.groups = desc->groups;
1611 csdev->dev.parent = desc->dev;
1612 csdev->dev.release = coresight_device_release;
1613 csdev->dev.bus = &coresight_bustype;
1614
1615
1616
1617
1618 csdev->dev.fwnode = fwnode_handle_get(dev_fwnode(desc->dev));
1619 dev_set_name(&csdev->dev, "%s", desc->name);
1620
1621 ret = device_register(&csdev->dev);
1622 if (ret) {
1623 put_device(&csdev->dev);
1624
1625
1626
1627
1628 goto err_out;
1629 }
1630
1631 if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
1632 csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) {
1633 ret = etm_perf_add_symlink_sink(csdev);
1634
1635 if (ret) {
1636 device_unregister(&csdev->dev);
1637
1638
1639
1640
1641
1642
1643 goto err_out;
1644 }
1645 }
1646
1647 mutex_lock(&coresight_mutex);
1648
1649 ret = coresight_create_conns_sysfs_group(csdev);
1650 if (!ret)
1651 ret = coresight_fixup_device_conns(csdev);
1652 if (!ret)
1653 ret = coresight_fixup_orphan_conns(csdev);
1654 if (!ret && cti_assoc_ops && cti_assoc_ops->add)
1655 cti_assoc_ops->add(csdev);
1656
1657 mutex_unlock(&coresight_mutex);
1658 if (ret) {
1659 coresight_unregister(csdev);
1660 return ERR_PTR(ret);
1661 }
1662
1663 return csdev;
1664
1665err_free_csdev:
1666 kfree(csdev);
1667err_out:
1668
1669 coresight_release_platform_data(NULL, desc->pdata);
1670 return ERR_PTR(ret);
1671}
1672EXPORT_SYMBOL_GPL(coresight_register);
1673
1674void coresight_unregister(struct coresight_device *csdev)
1675{
1676 etm_perf_del_symlink_sink(csdev);
1677
1678 if (cti_assoc_ops && cti_assoc_ops->remove)
1679 cti_assoc_ops->remove(csdev);
1680 coresight_remove_conns(csdev);
1681 coresight_clear_default_sink(csdev);
1682 coresight_release_platform_data(csdev, csdev->pdata);
1683 device_unregister(&csdev->dev);
1684}
1685EXPORT_SYMBOL_GPL(coresight_unregister);
1686
1687
1688
1689
1690
1691
1692
1693
1694static inline int coresight_search_device_idx(struct coresight_dev_list *dict,
1695 struct fwnode_handle *fwnode)
1696{
1697 int i;
1698
1699 for (i = 0; i < dict->nr_idx; i++)
1700 if (dict->fwnode_list[i] == fwnode)
1701 return i;
1702 return -ENOENT;
1703}
1704
1705bool coresight_loses_context_with_cpu(struct device *dev)
1706{
1707 return fwnode_property_present(dev_fwnode(dev),
1708 "arm,coresight-loses-context-with-cpu");
1709}
1710EXPORT_SYMBOL_GPL(coresight_loses_context_with_cpu);
1711
1712
1713
1714
1715
1716
1717
1718
1719char *coresight_alloc_device_name(struct coresight_dev_list *dict,
1720 struct device *dev)
1721{
1722 int idx;
1723 char *name = NULL;
1724 struct fwnode_handle **list;
1725
1726 mutex_lock(&coresight_mutex);
1727
1728 idx = coresight_search_device_idx(dict, dev_fwnode(dev));
1729 if (idx < 0) {
1730
1731 idx = dict->nr_idx;
1732 list = krealloc_array(dict->fwnode_list,
1733 idx + 1, sizeof(*dict->fwnode_list),
1734 GFP_KERNEL);
1735 if (ZERO_OR_NULL_PTR(list)) {
1736 idx = -ENOMEM;
1737 goto done;
1738 }
1739
1740 list[idx] = dev_fwnode(dev);
1741 dict->fwnode_list = list;
1742 dict->nr_idx = idx + 1;
1743 }
1744
1745 name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
1746done:
1747 mutex_unlock(&coresight_mutex);
1748 return name;
1749}
1750EXPORT_SYMBOL_GPL(coresight_alloc_device_name);
1751
1752struct bus_type coresight_bustype = {
1753 .name = "coresight",
1754};
1755
1756static int __init coresight_init(void)
1757{
1758 int ret;
1759
1760 ret = bus_register(&coresight_bustype);
1761 if (ret)
1762 return ret;
1763
1764 ret = etm_perf_init();
1765 if (ret)
1766 bus_unregister(&coresight_bustype);
1767
1768 return ret;
1769}
1770
1771static void __exit coresight_exit(void)
1772{
1773 etm_perf_exit();
1774 bus_unregister(&coresight_bustype);
1775}
1776
1777module_init(coresight_init);
1778module_exit(coresight_exit);
1779
1780MODULE_LICENSE("GPL v2");
1781MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
1782MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
1783MODULE_DESCRIPTION("Arm CoreSight tracer driver");
1784