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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / hwtracing / intel_th / core.c
blobc9ac3dc651135d156915f425ce9c232c94e568ad
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Intel(R) Trace Hub driver core
4 *
5 * Copyright (C) 2014-2015 Intel Corporation.
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/types.h>
11 #include <linux/module.h>
12 #include <linux/device.h>
13 #include <linux/sysfs.h>
14 #include <linux/kdev_t.h>
15 #include <linux/debugfs.h>
16 #include <linux/idr.h>
17 #include <linux/pci.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/dma-mapping.h>
20
21 #include "intel_th.h"
22 #include "debug.h"
23
24 static bool host_mode __read_mostly;
25 module_param(host_mode, bool, 0444);
26
27 static DEFINE_IDA(intel_th_ida);
28
29 static int intel_th_match(struct device *dev, struct device_driver *driver)
30 {
31 struct intel_th_driver *thdrv = to_intel_th_driver(driver);
32 struct intel_th_device *thdev = to_intel_th_device(dev);
33
34 if (thdev->type == INTEL_TH_SWITCH &&
35 (!thdrv->enable || !thdrv->disable))
36 return 0;
37
38 return !strcmp(thdev->name, driver->name);
39 }
40
41 static int intel_th_child_remove(struct device *dev, void *data)
42 {
43 device_release_driver(dev);
44
45 return 0;
46 }
47
48 static int intel_th_probe(struct device *dev)
49 {
50 struct intel_th_driver *thdrv = to_intel_th_driver(dev->driver);
51 struct intel_th_device *thdev = to_intel_th_device(dev);
52 struct intel_th_driver *hubdrv;
53 struct intel_th_device *hub = NULL;
54 int ret;
55
56 if (thdev->type == INTEL_TH_SWITCH)
57 hub = thdev;
58 else if (dev->parent)
59 hub = to_intel_th_device(dev->parent);
60
61 if (!hub || !hub->dev.driver)
62 return -EPROBE_DEFER;
63
64 hubdrv = to_intel_th_driver(hub->dev.driver);
65
66 pm_runtime_set_active(dev);
67 pm_runtime_no_callbacks(dev);
68 pm_runtime_enable(dev);
69
70 ret = thdrv->probe(to_intel_th_device(dev));
71 if (ret)
72 goto out_pm;
73
74 if (thdrv->attr_group) {
75 ret = sysfs_create_group(&thdev->dev.kobj, thdrv->attr_group);
76 if (ret)
77 goto out;
78 }
79
80 if (thdev->type == INTEL_TH_OUTPUT &&
81 !intel_th_output_assigned(thdev))
82 /* does not talk to hardware */
83 ret = hubdrv->assign(hub, thdev);
84
85 out:
86 if (ret)
87 thdrv->remove(thdev);
88
89 out_pm:
90 if (ret)
91 pm_runtime_disable(dev);
92
93 return ret;
94 }
95
96 static void intel_th_device_remove(struct intel_th_device *thdev);
97
98 static int intel_th_remove(struct device *dev)
99 {
100 struct intel_th_driver *thdrv = to_intel_th_driver(dev->driver);
101 struct intel_th_device *thdev = to_intel_th_device(dev);
102 struct intel_th_device *hub = to_intel_th_hub(thdev);
103 int err;
104
105 if (thdev->type == INTEL_TH_SWITCH) {
106 struct intel_th *th = to_intel_th(hub);
107 int i, lowest;
108
109 /* disconnect outputs */
110 err = device_for_each_child(dev, thdev, intel_th_child_remove);
111 if (err)
112 return err;
113
114 /*
115 * Remove outputs, that is, hub's children: they are created
116 * at hub's probe time by having the hub call
117 * intel_th_output_enable() for each of them.
118 */
119 for (i = 0, lowest = -1; i < th->num_thdevs; i++) {
120 /*
121 * Move the non-output devices from higher up the
122 * th->thdev[] array to lower positions to maintain
123 * a contiguous array.
124 */
125 if (th->thdev[i]->type != INTEL_TH_OUTPUT) {
126 if (lowest >= 0) {
127 th->thdev[lowest] = th->thdev[i];
128 th->thdev[i] = NULL;
129 ++lowest;
130 }
131
132 continue;
133 }
134
135 if (lowest == -1)
136 lowest = i;
137
138 intel_th_device_remove(th->thdev[i]);
139 th->thdev[i] = NULL;
140 }
141
142 if (lowest >= 0)
143 th->num_thdevs = lowest;
144 }
145
146 if (thdrv->attr_group)
147 sysfs_remove_group(&thdev->dev.kobj, thdrv->attr_group);
148
149 pm_runtime_get_sync(dev);
150
151 thdrv->remove(thdev);
152
153 if (intel_th_output_assigned(thdev)) {
154 struct intel_th_driver *hubdrv =
155 to_intel_th_driver(dev->parent->driver);
156
157 if (hub->dev.driver)
158 /* does not talk to hardware */
159 hubdrv->unassign(hub, thdev);
160 }
161
162 pm_runtime_disable(dev);
163 pm_runtime_set_active(dev);
164 pm_runtime_enable(dev);
165
166 return 0;
167 }
168
169 static struct bus_type intel_th_bus = {
170 .name = "intel_th",
171 .match = intel_th_match,
172 .probe = intel_th_probe,
173 .remove = intel_th_remove,
174 };
175
176 static void intel_th_device_free(struct intel_th_device *thdev);
177
178 static void intel_th_device_release(struct device *dev)
179 {
180 intel_th_device_free(to_intel_th_device(dev));
181 }
182
183 static struct device_type intel_th_source_device_type = {
184 .name = "intel_th_source_device",
185 .release = intel_th_device_release,
186 };
187
188 static char *intel_th_output_devnode(struct device *dev, umode_t *mode,
189 kuid_t *uid, kgid_t *gid)
190 {
191 struct intel_th_device *thdev = to_intel_th_device(dev);
192 struct intel_th *th = to_intel_th(thdev);
193 char *node;
194
195 if (thdev->id >= 0)
196 node = kasprintf(GFP_KERNEL, "intel_th%d/%s%d", th->id,
197 thdev->name, thdev->id);
198 else
199 node = kasprintf(GFP_KERNEL, "intel_th%d/%s", th->id,
200 thdev->name);
201
202 return node;
203 }
204
205 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
206 char *buf)
207 {
208 struct intel_th_device *thdev = to_intel_th_device(dev);
209
210 if (thdev->output.port >= 0)
211 return scnprintf(buf, PAGE_SIZE, "%u\n", thdev->output.port);
212
213 return scnprintf(buf, PAGE_SIZE, "unassigned\n");
214 }
215
216 static DEVICE_ATTR_RO(port);
217
218 static int intel_th_output_activate(struct intel_th_device *thdev)
219 {
220 struct intel_th_driver *thdrv =
221 to_intel_th_driver_or_null(thdev->dev.driver);
222 struct intel_th *th = to_intel_th(thdev);
223 int ret = 0;
224
225 if (!thdrv)
226 return -ENODEV;
227
228 if (!try_module_get(thdrv->driver.owner))
229 return -ENODEV;
230
231 pm_runtime_get_sync(&thdev->dev);
232
233 if (th->activate)
234 ret = th->activate(th);
235 if (ret)
236 goto fail_put;
237
238 if (thdrv->activate)
239 ret = thdrv->activate(thdev);
240 else
241 intel_th_trace_enable(thdev);
242
243 if (ret)
244 goto fail_deactivate;
245
246 return 0;
247
248 fail_deactivate:
249 if (th->deactivate)
250 th->deactivate(th);
251
252 fail_put:
253 pm_runtime_put(&thdev->dev);
254 module_put(thdrv->driver.owner);
255
256 return ret;
257 }
258
259 static void intel_th_output_deactivate(struct intel_th_device *thdev)
260 {
261 struct intel_th_driver *thdrv =
262 to_intel_th_driver_or_null(thdev->dev.driver);
263 struct intel_th *th = to_intel_th(thdev);
264
265 if (!thdrv)
266 return;
267
268 if (thdrv->deactivate)
269 thdrv->deactivate(thdev);
270 else
271 intel_th_trace_disable(thdev);
272
273 if (th->deactivate)
274 th->deactivate(th);
275
276 pm_runtime_put(&thdev->dev);
277 module_put(thdrv->driver.owner);
278 }
279
280 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
281 char *buf)
282 {
283 struct intel_th_device *thdev = to_intel_th_device(dev);
284
285 return scnprintf(buf, PAGE_SIZE, "%d\n", thdev->output.active);
286 }
287
288 static ssize_t active_store(struct device *dev, struct device_attribute *attr,
289 const char *buf, size_t size)
290 {
291 struct intel_th_device *thdev = to_intel_th_device(dev);
292 unsigned long val;
293 int ret;
294
295 ret = kstrtoul(buf, 10, &val);
296 if (ret)
297 return ret;
298
299 if (!!val != thdev->output.active) {
300 if (val)
301 ret = intel_th_output_activate(thdev);
302 else
303 intel_th_output_deactivate(thdev);
304 }
305
306 return ret ? ret : size;
307 }
308
309 static DEVICE_ATTR_RW(active);
310
311 static struct attribute *intel_th_output_attrs[] = {
312 &dev_attr_port.attr,
313 &dev_attr_active.attr,
314 NULL,
315 };
316
317 ATTRIBUTE_GROUPS(intel_th_output);
318
319 static struct device_type intel_th_output_device_type = {
320 .name = "intel_th_output_device",
321 .groups = intel_th_output_groups,
322 .release = intel_th_device_release,
323 .devnode = intel_th_output_devnode,
324 };
325
326 static struct device_type intel_th_switch_device_type = {
327 .name = "intel_th_switch_device",
328 .release = intel_th_device_release,
329 };
330
331 static struct device_type *intel_th_device_type[] = {
332 [INTEL_TH_SOURCE] = &intel_th_source_device_type,
333 [INTEL_TH_OUTPUT] = &intel_th_output_device_type,
334 [INTEL_TH_SWITCH] = &intel_th_switch_device_type,
335 };
336
337 int intel_th_driver_register(struct intel_th_driver *thdrv)
338 {
339 if (!thdrv->probe || !thdrv->remove)
340 return -EINVAL;
341
342 thdrv->driver.bus = &intel_th_bus;
343
344 return driver_register(&thdrv->driver);
345 }
346 EXPORT_SYMBOL_GPL(intel_th_driver_register);
347
348 void intel_th_driver_unregister(struct intel_th_driver *thdrv)
349 {
350 driver_unregister(&thdrv->driver);
351 }
352 EXPORT_SYMBOL_GPL(intel_th_driver_unregister);
353
354 static struct intel_th_device *
355 intel_th_device_alloc(struct intel_th *th, unsigned int type, const char *name,
356 int id)
357 {
358 struct device *parent;
359 struct intel_th_device *thdev;
360
361 if (type == INTEL_TH_OUTPUT)
362 parent = &th->hub->dev;
363 else
364 parent = th->dev;
365
366 thdev = kzalloc(sizeof(*thdev) + strlen(name) + 1, GFP_KERNEL);
367 if (!thdev)
368 return NULL;
369
370 thdev->id = id;
371 thdev->type = type;
372
373 strcpy(thdev->name, name);
374 device_initialize(&thdev->dev);
375 thdev->dev.bus = &intel_th_bus;
376 thdev->dev.type = intel_th_device_type[type];
377 thdev->dev.parent = parent;
378 thdev->dev.dma_mask = parent->dma_mask;
379 thdev->dev.dma_parms = parent->dma_parms;
380 dma_set_coherent_mask(&thdev->dev, parent->coherent_dma_mask);
381 if (id >= 0)
382 dev_set_name(&thdev->dev, "%d-%s%d", th->id, name, id);
383 else
384 dev_set_name(&thdev->dev, "%d-%s", th->id, name);
385
386 return thdev;
387 }
388
389 static int intel_th_device_add_resources(struct intel_th_device *thdev,
390 struct resource *res, int nres)
391 {
392 struct resource *r;
393
394 r = kmemdup(res, sizeof(*res) * nres, GFP_KERNEL);
395 if (!r)
396 return -ENOMEM;
397
398 thdev->resource = r;
399 thdev->num_resources = nres;
400
401 return 0;
402 }
403
404 static void intel_th_device_remove(struct intel_th_device *thdev)
405 {
406 device_del(&thdev->dev);
407 put_device(&thdev->dev);
408 }
409
410 static void intel_th_device_free(struct intel_th_device *thdev)
411 {
412 kfree(thdev->resource);
413 kfree(thdev);
414 }
415
416 /*
417 * Intel(R) Trace Hub subdevices
418 */
419 static const struct intel_th_subdevice {
420 const char *name;
421 struct resource res[3];
422 unsigned nres;
423 unsigned type;
424 unsigned otype;
425 bool mknode;
426 unsigned scrpd;
427 int id;
428 } intel_th_subdevices[] = {
429 {
430 .nres = 1,
431 .res = {
432 {
433 /* Handle TSCU and CTS from GTH driver */
434 .start = REG_GTH_OFFSET,
435 .end = REG_CTS_OFFSET + REG_CTS_LENGTH - 1,
436 .flags = IORESOURCE_MEM,
437 },
438 },
439 .name = "gth",
440 .type = INTEL_TH_SWITCH,
441 .id = -1,
442 },
443 {
444 .nres = 2,
445 .res = {
446 {
447 .start = REG_MSU_OFFSET,
448 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
449 .flags = IORESOURCE_MEM,
450 },
451 {
452 .start = BUF_MSU_OFFSET,
453 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
454 .flags = IORESOURCE_MEM,
455 },
456 },
457 .name = "msc",
458 .id = 0,
459 .type = INTEL_TH_OUTPUT,
460 .mknode = true,
461 .otype = GTH_MSU,
462 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC0_IS_ENABLED,
463 },
464 {
465 .nres = 2,
466 .res = {
467 {
468 .start = REG_MSU_OFFSET,
469 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
470 .flags = IORESOURCE_MEM,
471 },
472 {
473 .start = BUF_MSU_OFFSET,
474 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
475 .flags = IORESOURCE_MEM,
476 },
477 },
478 .name = "msc",
479 .id = 1,
480 .type = INTEL_TH_OUTPUT,
481 .mknode = true,
482 .otype = GTH_MSU,
483 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC1_IS_ENABLED,
484 },
485 {
486 .nres = 2,
487 .res = {
488 {
489 .start = REG_STH_OFFSET,
490 .end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
491 .flags = IORESOURCE_MEM,
492 },
493 {
494 .start = TH_MMIO_SW,
495 .end = 0,
496 .flags = IORESOURCE_MEM,
497 },
498 },
499 .id = -1,
500 .name = "sth",
501 .type = INTEL_TH_SOURCE,
502 },
503 {
504 .nres = 2,
505 .res = {
506 {
507 .start = REG_STH_OFFSET,
508 .end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
509 .flags = IORESOURCE_MEM,
510 },
511 {
512 .start = TH_MMIO_RTIT,
513 .end = 0,
514 .flags = IORESOURCE_MEM,
515 },
516 },
517 .id = -1,
518 .name = "rtit",
519 .type = INTEL_TH_SOURCE,
520 },
521 {
522 .nres = 1,
523 .res = {
524 {
525 .start = REG_PTI_OFFSET,
526 .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1,
527 .flags = IORESOURCE_MEM,
528 },
529 },
530 .id = -1,
531 .name = "pti",
532 .type = INTEL_TH_OUTPUT,
533 .otype = GTH_PTI,
534 .scrpd = SCRPD_PTI_IS_PRIM_DEST,
535 },
536 {
537 .nres = 1,
538 .res = {
539 {
540 .start = REG_PTI_OFFSET,
541 .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1,
542 .flags = IORESOURCE_MEM,
543 },
544 },
545 .id = -1,
546 .name = "lpp",
547 .type = INTEL_TH_OUTPUT,
548 .otype = GTH_LPP,
549 .scrpd = SCRPD_PTI_IS_PRIM_DEST,
550 },
551 {
552 .nres = 1,
553 .res = {
554 {
555 .start = REG_DCIH_OFFSET,
556 .end = REG_DCIH_OFFSET + REG_DCIH_LENGTH - 1,
557 .flags = IORESOURCE_MEM,
558 },
559 },
560 .id = -1,
561 .name = "dcih",
562 .type = INTEL_TH_OUTPUT,
563 },
564 };
565
566 #ifdef CONFIG_MODULES
567 static void __intel_th_request_hub_module(struct work_struct *work)
568 {
569 struct intel_th *th = container_of(work, struct intel_th,
570 request_module_work);
571
572 request_module("intel_th_%s", th->hub->name);
573 }
574
575 static int intel_th_request_hub_module(struct intel_th *th)
576 {
577 INIT_WORK(&th->request_module_work, __intel_th_request_hub_module);
578 schedule_work(&th->request_module_work);
579
580 return 0;
581 }
582
583 static void intel_th_request_hub_module_flush(struct intel_th *th)
584 {
585 flush_work(&th->request_module_work);
586 }
587 #else
588 static inline int intel_th_request_hub_module(struct intel_th *th)
589 {
590 return -EINVAL;
591 }
592
593 static inline void intel_th_request_hub_module_flush(struct intel_th *th)
594 {
595 }
596 #endif /* CONFIG_MODULES */
597
598 static struct intel_th_device *
599 intel_th_subdevice_alloc(struct intel_th *th,
600 const struct intel_th_subdevice *subdev)
601 {
602 struct intel_th_device *thdev;
603 struct resource res[3];
604 unsigned int req = 0;
605 int r, err;
606
607 thdev = intel_th_device_alloc(th, subdev->type, subdev->name,
608 subdev->id);
609 if (!thdev)
610 return ERR_PTR(-ENOMEM);
611
612 thdev->drvdata = th->drvdata;
613
614 memcpy(res, subdev->res,
615 sizeof(struct resource) * subdev->nres);
616
617 for (r = 0; r < subdev->nres; r++) {
618 struct resource *devres = th->resource;
619 int bar = TH_MMIO_CONFIG;
620
621 /*
622 * Take .end == 0 to mean 'take the whole bar',
623 * .start then tells us which bar it is. Default to
624 * TH_MMIO_CONFIG.
625 */
626 if (!res[r].end && res[r].flags == IORESOURCE_MEM) {
627 bar = res[r].start;
628 err = -ENODEV;
629 if (bar >= th->num_resources)
630 goto fail_put_device;
631 res[r].start = 0;
632 res[r].end = resource_size(&devres[bar]) - 1;
633 }
634
635 if (res[r].flags & IORESOURCE_MEM) {
636 res[r].start += devres[bar].start;
637 res[r].end += devres[bar].start;
638
639 dev_dbg(th->dev, "%s:%d @ %pR\n",
640 subdev->name, r, &res[r]);
641 } else if (res[r].flags & IORESOURCE_IRQ) {
642 /*
643 * Only pass on the IRQ if we have useful interrupts:
644 * the ones that can be configured via MINTCTL.
645 */
646 if (INTEL_TH_CAP(th, has_mintctl) && th->irq != -1)
647 res[r].start = th->irq;
648 }
649 }
650
651 err = intel_th_device_add_resources(thdev, res, subdev->nres);
652 if (err)
653 goto fail_put_device;
654
655 if (subdev->type == INTEL_TH_OUTPUT) {
656 if (subdev->mknode)
657 thdev->dev.devt = MKDEV(th->major, th->num_thdevs);
658 thdev->output.type = subdev->otype;
659 thdev->output.port = -1;
660 thdev->output.scratchpad = subdev->scrpd;
661 } else if (subdev->type == INTEL_TH_SWITCH) {
662 thdev->host_mode =
663 INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
664 th->hub = thdev;
665 }
666
667 err = device_add(&thdev->dev);
668 if (err)
669 goto fail_free_res;
670
671 /* need switch driver to be loaded to enumerate the rest */
672 if (subdev->type == INTEL_TH_SWITCH && !req) {
673 err = intel_th_request_hub_module(th);
674 if (!err)
675 req++;
676 }
677
678 return thdev;
679
680 fail_free_res:
681 kfree(thdev->resource);
682
683 fail_put_device:
684 put_device(&thdev->dev);
685
686 return ERR_PTR(err);
687 }
688
689 /**
690 * intel_th_output_enable() - find and enable a device for a given output type
691 * @th: Intel TH instance
692 * @otype: output type
693 *
694 * Go through the unallocated output devices, find the first one whos type
695 * matches @otype and instantiate it. These devices are removed when the hub
696 * device is removed, see intel_th_remove().
697 */
698 int intel_th_output_enable(struct intel_th *th, unsigned int otype)
699 {
700 struct intel_th_device *thdev;
701 int src = 0, dst = 0;
702
703 for (src = 0, dst = 0; dst <= th->num_thdevs; src++, dst++) {
704 for (; src < ARRAY_SIZE(intel_th_subdevices); src++) {
705 if (intel_th_subdevices[src].type != INTEL_TH_OUTPUT)
706 continue;
707
708 if (intel_th_subdevices[src].otype != otype)
709 continue;
710
711 break;
712 }
713
714 /* no unallocated matching subdevices */
715 if (src == ARRAY_SIZE(intel_th_subdevices))
716 return -ENODEV;
717
718 for (; dst < th->num_thdevs; dst++) {
719 if (th->thdev[dst]->type != INTEL_TH_OUTPUT)
720 continue;
721
722 if (th->thdev[dst]->output.type != otype)
723 continue;
724
725 break;
726 }
727
728 /*
729 * intel_th_subdevices[src] matches our requirements and is
730 * not matched in th::thdev[]
731 */
732 if (dst == th->num_thdevs)
733 goto found;
734 }
735
736 return -ENODEV;
737
738 found:
739 thdev = intel_th_subdevice_alloc(th, &intel_th_subdevices[src]);
740 if (IS_ERR(thdev))
741 return PTR_ERR(thdev);
742
743 th->thdev[th->num_thdevs++] = thdev;
744
745 return 0;
746 }
747 EXPORT_SYMBOL_GPL(intel_th_output_enable);
748
749 static int intel_th_populate(struct intel_th *th)
750 {
751 int src;
752
753 /* create devices for each intel_th_subdevice */
754 for (src = 0; src < ARRAY_SIZE(intel_th_subdevices); src++) {
755 const struct intel_th_subdevice *subdev =
756 &intel_th_subdevices[src];
757 struct intel_th_device *thdev;
758
759 /* only allow SOURCE and SWITCH devices in host mode */
760 if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
761 subdev->type == INTEL_TH_OUTPUT)
762 continue;
763
764 /*
765 * don't enable port OUTPUTs in this path; SWITCH enables them
766 * via intel_th_output_enable()
767 */
768 if (subdev->type == INTEL_TH_OUTPUT &&
769 subdev->otype != GTH_NONE)
770 continue;
771
772 thdev = intel_th_subdevice_alloc(th, subdev);
773 /* note: caller should free subdevices from th::thdev[] */
774 if (IS_ERR(thdev)) {
775 /* ENODEV for individual subdevices is allowed */
776 if (PTR_ERR(thdev) == -ENODEV)
777 continue;
778
779 return PTR_ERR(thdev);
780 }
781
782 th->thdev[th->num_thdevs++] = thdev;
783 }
784
785 return 0;
786 }
787
788 static int intel_th_output_open(struct inode *inode, struct file *file)
789 {
790 const struct file_operations *fops;
791 struct intel_th_driver *thdrv;
792 struct device *dev;
793 int err;
794
795 dev = bus_find_device_by_devt(&intel_th_bus, inode->i_rdev);
796 if (!dev || !dev->driver)
797 return -ENODEV;
798
799 thdrv = to_intel_th_driver(dev->driver);
800 fops = fops_get(thdrv->fops);
801 if (!fops)
802 return -ENODEV;
803
804 replace_fops(file, fops);
805
806 file->private_data = to_intel_th_device(dev);
807
808 if (file->f_op->open) {
809 err = file->f_op->open(inode, file);
810 return err;
811 }
812
813 return 0;
814 }
815
816 static const struct file_operations intel_th_output_fops = {
817 .open = intel_th_output_open,
818 .llseek = noop_llseek,
819 };
820
821 static irqreturn_t intel_th_irq(int irq, void *data)
822 {
823 struct intel_th *th = data;
824 irqreturn_t ret = IRQ_NONE;
825 struct intel_th_driver *d;
826 int i;
827
828 for (i = 0; i < th->num_thdevs; i++) {
829 if (th->thdev[i]->type != INTEL_TH_OUTPUT)
830 continue;
831
832 d = to_intel_th_driver(th->thdev[i]->dev.driver);
833 if (d && d->irq)
834 ret |= d->irq(th->thdev[i]);
835 }
836
837 return ret;
838 }
839
840 /**
841 * intel_th_alloc() - allocate a new Intel TH device and its subdevices
842 * @dev: parent device
843 * @devres: resources indexed by th_mmio_idx
844 * @irq: irq number
845 */
846 struct intel_th *
847 intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata,
848 struct resource *devres, unsigned int ndevres)
849 {
850 int err, r, nr_mmios = 0;
851 struct intel_th *th;
852
853 th = kzalloc(sizeof(*th), GFP_KERNEL);
854 if (!th)
855 return ERR_PTR(-ENOMEM);
856
857 th->id = ida_simple_get(&intel_th_ida, 0, 0, GFP_KERNEL);
858 if (th->id < 0) {
859 err = th->id;
860 goto err_alloc;
861 }
862
863 th->major = __register_chrdev(0, 0, TH_POSSIBLE_OUTPUTS,
864 "intel_th/output", &intel_th_output_fops);
865 if (th->major < 0) {
866 err = th->major;
867 goto err_ida;
868 }
869 th->irq = -1;
870 th->dev = dev;
871 th->drvdata = drvdata;
872
873 for (r = 0; r < ndevres; r++)
874 switch (devres[r].flags & IORESOURCE_TYPE_BITS) {
875 case IORESOURCE_MEM:
876 th->resource[nr_mmios++] = devres[r];
877 break;
878 case IORESOURCE_IRQ:
879 err = devm_request_irq(dev, devres[r].start,
880 intel_th_irq, IRQF_SHARED,
881 dev_name(dev), th);
882 if (err)
883 goto err_chrdev;
884
885 if (th->irq == -1)
886 th->irq = devres[r].start;
887 th->num_irqs++;
888 break;
889 default:
890 dev_warn(dev, "Unknown resource type %lx\n",
891 devres[r].flags);
892 break;
893 }
894
895 th->num_resources = nr_mmios;
896
897 dev_set_drvdata(dev, th);
898
899 pm_runtime_no_callbacks(dev);
900 pm_runtime_put(dev);
901 pm_runtime_allow(dev);
902
903 err = intel_th_populate(th);
904 if (err) {
905 /* free the subdevices and undo everything */
906 intel_th_free(th);
907 return ERR_PTR(err);
908 }
909
910 return th;
911
912 err_chrdev:
913 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
914 "intel_th/output");
915
916 err_ida:
917 ida_simple_remove(&intel_th_ida, th->id);
918
919 err_alloc:
920 kfree(th);
921
922 return ERR_PTR(err);
923 }
924 EXPORT_SYMBOL_GPL(intel_th_alloc);
925
926 void intel_th_free(struct intel_th *th)
927 {
928 int i;
929
930 intel_th_request_hub_module_flush(th);
931
932 intel_th_device_remove(th->hub);
933 for (i = 0; i < th->num_thdevs; i++) {
934 if (th->thdev[i] != th->hub)
935 intel_th_device_remove(th->thdev[i]);
936 th->thdev[i] = NULL;
937 }
938
939 th->num_thdevs = 0;
940
941 for (i = 0; i < th->num_irqs; i++)
942 devm_free_irq(th->dev, th->irq + i, th);
943
944 pm_runtime_get_sync(th->dev);
945 pm_runtime_forbid(th->dev);
946
947 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
948 "intel_th/output");
949
950 ida_simple_remove(&intel_th_ida, th->id);
951
952 kfree(th);
953 }
954 EXPORT_SYMBOL_GPL(intel_th_free);
955
956 /**
957 * intel_th_trace_enable() - enable tracing for an output device
958 * @thdev: output device that requests tracing be enabled
959 */
960 int intel_th_trace_enable(struct intel_th_device *thdev)
961 {
962 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
963 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
964
965 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
966 return -EINVAL;
967
968 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
969 return -EINVAL;
970
971 pm_runtime_get_sync(&thdev->dev);
972 hubdrv->enable(hub, &thdev->output);
973
974 return 0;
975 }
976 EXPORT_SYMBOL_GPL(intel_th_trace_enable);
977
978 /**
979 * intel_th_trace_switch() - execute a switch sequence
980 * @thdev: output device that requests tracing switch
981 */
982 int intel_th_trace_switch(struct intel_th_device *thdev)
983 {
984 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
985 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
986
987 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
988 return -EINVAL;
989
990 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
991 return -EINVAL;
992
993 hubdrv->trig_switch(hub, &thdev->output);
994
995 return 0;
996 }
997 EXPORT_SYMBOL_GPL(intel_th_trace_switch);
998
999 /**
1000 * intel_th_trace_disable() - disable tracing for an output device
1001 * @thdev: output device that requests tracing be disabled
1002 */
1003 int intel_th_trace_disable(struct intel_th_device *thdev)
1004 {
1005 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
1006 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1007
1008 WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH);
1009 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
1010 return -EINVAL;
1011
1012 hubdrv->disable(hub, &thdev->output);
1013 pm_runtime_put(&thdev->dev);
1014
1015 return 0;
1016 }
1017 EXPORT_SYMBOL_GPL(intel_th_trace_disable);
1018
1019 int intel_th_set_output(struct intel_th_device *thdev,
1020 unsigned int master)
1021 {
1022 struct intel_th_device *hub = to_intel_th_hub(thdev);
1023 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1024 int ret;
1025
1026 /* In host mode, this is up to the external debugger, do nothing. */
1027 if (hub->host_mode)
1028 return 0;
1029
1030 /*
1031 * hub is instantiated together with the source device that
1032 * calls here, so guaranteed to be present.
1033 */
1034 hubdrv = to_intel_th_driver(hub->dev.driver);
1035 if (!hubdrv || !try_module_get(hubdrv->driver.owner))
1036 return -EINVAL;
1037
1038 if (!hubdrv->set_output) {
1039 ret = -ENOTSUPP;
1040 goto out;
1041 }
1042
1043 ret = hubdrv->set_output(hub, master);
1044
1045 out:
1046 module_put(hubdrv->driver.owner);
1047 return ret;
1048 }
1049 EXPORT_SYMBOL_GPL(intel_th_set_output);
1050
1051 static int __init intel_th_init(void)
1052 {
1053 intel_th_debug_init();
1054
1055 return bus_register(&intel_th_bus);
1056 }
1057 subsys_initcall(intel_th_init);
1058
1059 static void __exit intel_th_exit(void)
1060 {
1061 intel_th_debug_done();
1062
1063 bus_unregister(&intel_th_bus);
1064 }
1065 module_exit(intel_th_exit);
1066
1067 MODULE_LICENSE("GPL v2");
1068 MODULE_DESCRIPTION("Intel(R) Trace Hub controller driver");
1069 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
Linux with added FPC-III support