Loading...
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
24static bool host_mode __read_mostly;
25module_param(host_mode, bool, 0444);
26
27static DEFINE_IDA(intel_th_ida);
28
29static 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
41static int intel_th_child_remove(struct device *dev, void *data)
42{
43 device_release_driver(dev);
44
45 return 0;
46}
47
48static 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
85out:
86 if (ret)
87 thdrv->remove(thdev);
88
89out_pm:
90 if (ret)
91 pm_runtime_disable(dev);
92
93 return ret;
94}
95
96static void intel_th_device_remove(struct intel_th_device *thdev);
97
98static void 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
104 if (thdev->type == INTEL_TH_SWITCH) {
105 struct intel_th *th = to_intel_th(hub);
106 int i, lowest;
107
108 /*
109 * disconnect outputs
110 *
111 * intel_th_child_remove returns 0 unconditionally, so there is
112 * no need to check the return value of device_for_each_child.
113 */
114 device_for_each_child(dev, thdev, intel_th_child_remove);
115
116 /*
117 * Remove outputs, that is, hub's children: they are created
118 * at hub's probe time by having the hub call
119 * intel_th_output_enable() for each of them.
120 */
121 for (i = 0, lowest = -1; i < th->num_thdevs; i++) {
122 /*
123 * Move the non-output devices from higher up the
124 * th->thdev[] array to lower positions to maintain
125 * a contiguous array.
126 */
127 if (th->thdev[i]->type != INTEL_TH_OUTPUT) {
128 if (lowest >= 0) {
129 th->thdev[lowest] = th->thdev[i];
130 th->thdev[i] = NULL;
131 ++lowest;
132 }
133
134 continue;
135 }
136
137 if (lowest == -1)
138 lowest = i;
139
140 intel_th_device_remove(th->thdev[i]);
141 th->thdev[i] = NULL;
142 }
143
144 if (lowest >= 0)
145 th->num_thdevs = lowest;
146 }
147
148 if (thdrv->attr_group)
149 sysfs_remove_group(&thdev->dev.kobj, thdrv->attr_group);
150
151 pm_runtime_get_sync(dev);
152
153 thdrv->remove(thdev);
154
155 if (intel_th_output_assigned(thdev)) {
156 struct intel_th_driver *hubdrv =
157 to_intel_th_driver(dev->parent->driver);
158
159 if (hub->dev.driver)
160 /* does not talk to hardware */
161 hubdrv->unassign(hub, thdev);
162 }
163
164 pm_runtime_disable(dev);
165 pm_runtime_set_active(dev);
166 pm_runtime_enable(dev);
167}
168
169static 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
176static void intel_th_device_free(struct intel_th_device *thdev);
177
178static void intel_th_device_release(struct device *dev)
179{
180 intel_th_device_free(to_intel_th_device(dev));
181}
182
183static struct device_type intel_th_source_device_type = {
184 .name = "intel_th_source_device",
185 .release = intel_th_device_release,
186};
187
188static 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
205static 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
216static DEVICE_ATTR_RO(port);
217
218static void intel_th_trace_prepare(struct intel_th_device *thdev)
219{
220 struct intel_th_device *hub = to_intel_th_hub(thdev);
221 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
222
223 if (hub->type != INTEL_TH_SWITCH)
224 return;
225
226 if (thdev->type != INTEL_TH_OUTPUT)
227 return;
228
229 pm_runtime_get_sync(&thdev->dev);
230 hubdrv->prepare(hub, &thdev->output);
231 pm_runtime_put(&thdev->dev);
232}
233
234static int intel_th_output_activate(struct intel_th_device *thdev)
235{
236 struct intel_th_driver *thdrv =
237 to_intel_th_driver_or_null(thdev->dev.driver);
238 struct intel_th *th = to_intel_th(thdev);
239 int ret = 0;
240
241 if (!thdrv)
242 return -ENODEV;
243
244 if (!try_module_get(thdrv->driver.owner))
245 return -ENODEV;
246
247 pm_runtime_get_sync(&thdev->dev);
248
249 if (th->activate)
250 ret = th->activate(th);
251 if (ret)
252 goto fail_put;
253
254 intel_th_trace_prepare(thdev);
255 if (thdrv->activate)
256 ret = thdrv->activate(thdev);
257 else
258 intel_th_trace_enable(thdev);
259
260 if (ret)
261 goto fail_deactivate;
262
263 return 0;
264
265fail_deactivate:
266 if (th->deactivate)
267 th->deactivate(th);
268
269fail_put:
270 pm_runtime_put(&thdev->dev);
271 module_put(thdrv->driver.owner);
272
273 return ret;
274}
275
276static void intel_th_output_deactivate(struct intel_th_device *thdev)
277{
278 struct intel_th_driver *thdrv =
279 to_intel_th_driver_or_null(thdev->dev.driver);
280 struct intel_th *th = to_intel_th(thdev);
281
282 if (!thdrv)
283 return;
284
285 if (thdrv->deactivate)
286 thdrv->deactivate(thdev);
287 else
288 intel_th_trace_disable(thdev);
289
290 if (th->deactivate)
291 th->deactivate(th);
292
293 pm_runtime_put(&thdev->dev);
294 module_put(thdrv->driver.owner);
295}
296
297static ssize_t active_show(struct device *dev, struct device_attribute *attr,
298 char *buf)
299{
300 struct intel_th_device *thdev = to_intel_th_device(dev);
301
302 return scnprintf(buf, PAGE_SIZE, "%d\n", thdev->output.active);
303}
304
305static ssize_t active_store(struct device *dev, struct device_attribute *attr,
306 const char *buf, size_t size)
307{
308 struct intel_th_device *thdev = to_intel_th_device(dev);
309 unsigned long val;
310 int ret;
311
312 ret = kstrtoul(buf, 10, &val);
313 if (ret)
314 return ret;
315
316 if (!!val != thdev->output.active) {
317 if (val)
318 ret = intel_th_output_activate(thdev);
319 else
320 intel_th_output_deactivate(thdev);
321 }
322
323 return ret ? ret : size;
324}
325
326static DEVICE_ATTR_RW(active);
327
328static struct attribute *intel_th_output_attrs[] = {
329 &dev_attr_port.attr,
330 &dev_attr_active.attr,
331 NULL,
332};
333
334ATTRIBUTE_GROUPS(intel_th_output);
335
336static struct device_type intel_th_output_device_type = {
337 .name = "intel_th_output_device",
338 .groups = intel_th_output_groups,
339 .release = intel_th_device_release,
340 .devnode = intel_th_output_devnode,
341};
342
343static struct device_type intel_th_switch_device_type = {
344 .name = "intel_th_switch_device",
345 .release = intel_th_device_release,
346};
347
348static struct device_type *intel_th_device_type[] = {
349 [INTEL_TH_SOURCE] = &intel_th_source_device_type,
350 [INTEL_TH_OUTPUT] = &intel_th_output_device_type,
351 [INTEL_TH_SWITCH] = &intel_th_switch_device_type,
352};
353
354int intel_th_driver_register(struct intel_th_driver *thdrv)
355{
356 if (!thdrv->probe || !thdrv->remove)
357 return -EINVAL;
358
359 thdrv->driver.bus = &intel_th_bus;
360
361 return driver_register(&thdrv->driver);
362}
363EXPORT_SYMBOL_GPL(intel_th_driver_register);
364
365void intel_th_driver_unregister(struct intel_th_driver *thdrv)
366{
367 driver_unregister(&thdrv->driver);
368}
369EXPORT_SYMBOL_GPL(intel_th_driver_unregister);
370
371static struct intel_th_device *
372intel_th_device_alloc(struct intel_th *th, unsigned int type, const char *name,
373 int id)
374{
375 struct device *parent;
376 struct intel_th_device *thdev;
377
378 if (type == INTEL_TH_OUTPUT)
379 parent = &th->hub->dev;
380 else
381 parent = th->dev;
382
383 thdev = kzalloc(sizeof(*thdev) + strlen(name) + 1, GFP_KERNEL);
384 if (!thdev)
385 return NULL;
386
387 thdev->id = id;
388 thdev->type = type;
389
390 strcpy(thdev->name, name);
391 device_initialize(&thdev->dev);
392 thdev->dev.bus = &intel_th_bus;
393 thdev->dev.type = intel_th_device_type[type];
394 thdev->dev.parent = parent;
395 thdev->dev.dma_mask = parent->dma_mask;
396 thdev->dev.dma_parms = parent->dma_parms;
397 dma_set_coherent_mask(&thdev->dev, parent->coherent_dma_mask);
398 if (id >= 0)
399 dev_set_name(&thdev->dev, "%d-%s%d", th->id, name, id);
400 else
401 dev_set_name(&thdev->dev, "%d-%s", th->id, name);
402
403 return thdev;
404}
405
406static int intel_th_device_add_resources(struct intel_th_device *thdev,
407 struct resource *res, int nres)
408{
409 struct resource *r;
410
411 r = kmemdup(res, sizeof(*res) * nres, GFP_KERNEL);
412 if (!r)
413 return -ENOMEM;
414
415 thdev->resource = r;
416 thdev->num_resources = nres;
417
418 return 0;
419}
420
421static void intel_th_device_remove(struct intel_th_device *thdev)
422{
423 device_del(&thdev->dev);
424 put_device(&thdev->dev);
425}
426
427static void intel_th_device_free(struct intel_th_device *thdev)
428{
429 kfree(thdev->resource);
430 kfree(thdev);
431}
432
433/*
434 * Intel(R) Trace Hub subdevices
435 */
436static const struct intel_th_subdevice {
437 const char *name;
438 struct resource res[3];
439 unsigned nres;
440 unsigned type;
441 unsigned otype;
442 bool mknode;
443 unsigned scrpd;
444 int id;
445} intel_th_subdevices[] = {
446 {
447 .nres = 1,
448 .res = {
449 {
450 /* Handle TSCU and CTS from GTH driver */
451 .start = REG_GTH_OFFSET,
452 .end = REG_CTS_OFFSET + REG_CTS_LENGTH - 1,
453 .flags = IORESOURCE_MEM,
454 },
455 },
456 .name = "gth",
457 .type = INTEL_TH_SWITCH,
458 .id = -1,
459 },
460 {
461 .nres = 2,
462 .res = {
463 {
464 .start = REG_MSU_OFFSET,
465 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
466 .flags = IORESOURCE_MEM,
467 },
468 {
469 .start = BUF_MSU_OFFSET,
470 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
471 .flags = IORESOURCE_MEM,
472 },
473 },
474 .name = "msc",
475 .id = 0,
476 .type = INTEL_TH_OUTPUT,
477 .mknode = true,
478 .otype = GTH_MSU,
479 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC0_IS_ENABLED,
480 },
481 {
482 .nres = 2,
483 .res = {
484 {
485 .start = REG_MSU_OFFSET,
486 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
487 .flags = IORESOURCE_MEM,
488 },
489 {
490 .start = BUF_MSU_OFFSET,
491 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
492 .flags = IORESOURCE_MEM,
493 },
494 },
495 .name = "msc",
496 .id = 1,
497 .type = INTEL_TH_OUTPUT,
498 .mknode = true,
499 .otype = GTH_MSU,
500 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC1_IS_ENABLED,
501 },
502 {
503 .nres = 2,
504 .res = {
505 {
506 .start = REG_STH_OFFSET,
507 .end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
508 .flags = IORESOURCE_MEM,
509 },
510 {
511 .start = TH_MMIO_SW,
512 .end = 0,
513 .flags = IORESOURCE_MEM,
514 },
515 },
516 .id = -1,
517 .name = "sth",
518 .type = INTEL_TH_SOURCE,
519 },
520 {
521 .nres = 2,
522 .res = {
523 {
524 .start = REG_STH_OFFSET,
525 .end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
526 .flags = IORESOURCE_MEM,
527 },
528 {
529 .start = TH_MMIO_RTIT,
530 .end = 0,
531 .flags = IORESOURCE_MEM,
532 },
533 },
534 .id = -1,
535 .name = "rtit",
536 .type = INTEL_TH_SOURCE,
537 },
538 {
539 .nres = 1,
540 .res = {
541 {
542 .start = REG_PTI_OFFSET,
543 .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1,
544 .flags = IORESOURCE_MEM,
545 },
546 },
547 .id = -1,
548 .name = "pti",
549 .type = INTEL_TH_OUTPUT,
550 .otype = GTH_PTI,
551 .scrpd = SCRPD_PTI_IS_PRIM_DEST,
552 },
553 {
554 .nres = 1,
555 .res = {
556 {
557 .start = REG_PTI_OFFSET,
558 .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1,
559 .flags = IORESOURCE_MEM,
560 },
561 },
562 .id = -1,
563 .name = "lpp",
564 .type = INTEL_TH_OUTPUT,
565 .otype = GTH_LPP,
566 .scrpd = SCRPD_PTI_IS_PRIM_DEST,
567 },
568 {
569 .nres = 1,
570 .res = {
571 {
572 .start = REG_DCIH_OFFSET,
573 .end = REG_DCIH_OFFSET + REG_DCIH_LENGTH - 1,
574 .flags = IORESOURCE_MEM,
575 },
576 },
577 .id = -1,
578 .name = "dcih",
579 .type = INTEL_TH_OUTPUT,
580 },
581};
582
583#ifdef CONFIG_MODULES
584static void __intel_th_request_hub_module(struct work_struct *work)
585{
586 struct intel_th *th = container_of(work, struct intel_th,
587 request_module_work);
588
589 request_module("intel_th_%s", th->hub->name);
590}
591
592static int intel_th_request_hub_module(struct intel_th *th)
593{
594 INIT_WORK(&th->request_module_work, __intel_th_request_hub_module);
595 schedule_work(&th->request_module_work);
596
597 return 0;
598}
599
600static void intel_th_request_hub_module_flush(struct intel_th *th)
601{
602 flush_work(&th->request_module_work);
603}
604#else
605static inline int intel_th_request_hub_module(struct intel_th *th)
606{
607 return -EINVAL;
608}
609
610static inline void intel_th_request_hub_module_flush(struct intel_th *th)
611{
612}
613#endif /* CONFIG_MODULES */
614
615static struct intel_th_device *
616intel_th_subdevice_alloc(struct intel_th *th,
617 const struct intel_th_subdevice *subdev)
618{
619 struct intel_th_device *thdev;
620 struct resource res[3];
621 unsigned int req = 0;
622 int r, err;
623
624 thdev = intel_th_device_alloc(th, subdev->type, subdev->name,
625 subdev->id);
626 if (!thdev)
627 return ERR_PTR(-ENOMEM);
628
629 thdev->drvdata = th->drvdata;
630
631 memcpy(res, subdev->res,
632 sizeof(struct resource) * subdev->nres);
633
634 for (r = 0; r < subdev->nres; r++) {
635 struct resource *devres = th->resource;
636 int bar = TH_MMIO_CONFIG;
637
638 /*
639 * Take .end == 0 to mean 'take the whole bar',
640 * .start then tells us which bar it is. Default to
641 * TH_MMIO_CONFIG.
642 */
643 if (!res[r].end && res[r].flags == IORESOURCE_MEM) {
644 bar = res[r].start;
645 err = -ENODEV;
646 if (bar >= th->num_resources)
647 goto fail_put_device;
648 res[r].start = 0;
649 res[r].end = resource_size(&devres[bar]) - 1;
650 }
651
652 if (res[r].flags & IORESOURCE_MEM) {
653 res[r].start += devres[bar].start;
654 res[r].end += devres[bar].start;
655
656 dev_dbg(th->dev, "%s:%d @ %pR\n",
657 subdev->name, r, &res[r]);
658 } else if (res[r].flags & IORESOURCE_IRQ) {
659 /*
660 * Only pass on the IRQ if we have useful interrupts:
661 * the ones that can be configured via MINTCTL.
662 */
663 if (INTEL_TH_CAP(th, has_mintctl) && th->irq != -1)
664 res[r].start = th->irq;
665 }
666 }
667
668 err = intel_th_device_add_resources(thdev, res, subdev->nres);
669 if (err)
670 goto fail_put_device;
671
672 if (subdev->type == INTEL_TH_OUTPUT) {
673 if (subdev->mknode)
674 thdev->dev.devt = MKDEV(th->major, th->num_thdevs);
675 thdev->output.type = subdev->otype;
676 thdev->output.port = -1;
677 thdev->output.scratchpad = subdev->scrpd;
678 } else if (subdev->type == INTEL_TH_SWITCH) {
679 thdev->host_mode =
680 INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
681 th->hub = thdev;
682 }
683
684 err = device_add(&thdev->dev);
685 if (err)
686 goto fail_free_res;
687
688 /* need switch driver to be loaded to enumerate the rest */
689 if (subdev->type == INTEL_TH_SWITCH && !req) {
690 err = intel_th_request_hub_module(th);
691 if (!err)
692 req++;
693 }
694
695 return thdev;
696
697fail_free_res:
698 kfree(thdev->resource);
699
700fail_put_device:
701 put_device(&thdev->dev);
702
703 return ERR_PTR(err);
704}
705
706/**
707 * intel_th_output_enable() - find and enable a device for a given output type
708 * @th: Intel TH instance
709 * @otype: output type
710 *
711 * Go through the unallocated output devices, find the first one whos type
712 * matches @otype and instantiate it. These devices are removed when the hub
713 * device is removed, see intel_th_remove().
714 */
715int intel_th_output_enable(struct intel_th *th, unsigned int otype)
716{
717 struct intel_th_device *thdev;
718 int src = 0, dst = 0;
719
720 for (src = 0, dst = 0; dst <= th->num_thdevs; src++, dst++) {
721 for (; src < ARRAY_SIZE(intel_th_subdevices); src++) {
722 if (intel_th_subdevices[src].type != INTEL_TH_OUTPUT)
723 continue;
724
725 if (intel_th_subdevices[src].otype != otype)
726 continue;
727
728 break;
729 }
730
731 /* no unallocated matching subdevices */
732 if (src == ARRAY_SIZE(intel_th_subdevices))
733 return -ENODEV;
734
735 for (; dst < th->num_thdevs; dst++) {
736 if (th->thdev[dst]->type != INTEL_TH_OUTPUT)
737 continue;
738
739 if (th->thdev[dst]->output.type != otype)
740 continue;
741
742 break;
743 }
744
745 /*
746 * intel_th_subdevices[src] matches our requirements and is
747 * not matched in th::thdev[]
748 */
749 if (dst == th->num_thdevs)
750 goto found;
751 }
752
753 return -ENODEV;
754
755found:
756 thdev = intel_th_subdevice_alloc(th, &intel_th_subdevices[src]);
757 if (IS_ERR(thdev))
758 return PTR_ERR(thdev);
759
760 th->thdev[th->num_thdevs++] = thdev;
761
762 return 0;
763}
764EXPORT_SYMBOL_GPL(intel_th_output_enable);
765
766static int intel_th_populate(struct intel_th *th)
767{
768 int src;
769
770 /* create devices for each intel_th_subdevice */
771 for (src = 0; src < ARRAY_SIZE(intel_th_subdevices); src++) {
772 const struct intel_th_subdevice *subdev =
773 &intel_th_subdevices[src];
774 struct intel_th_device *thdev;
775
776 /* only allow SOURCE and SWITCH devices in host mode */
777 if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
778 subdev->type == INTEL_TH_OUTPUT)
779 continue;
780
781 /*
782 * don't enable port OUTPUTs in this path; SWITCH enables them
783 * via intel_th_output_enable()
784 */
785 if (subdev->type == INTEL_TH_OUTPUT &&
786 subdev->otype != GTH_NONE)
787 continue;
788
789 thdev = intel_th_subdevice_alloc(th, subdev);
790 /* note: caller should free subdevices from th::thdev[] */
791 if (IS_ERR(thdev)) {
792 /* ENODEV for individual subdevices is allowed */
793 if (PTR_ERR(thdev) == -ENODEV)
794 continue;
795
796 return PTR_ERR(thdev);
797 }
798
799 th->thdev[th->num_thdevs++] = thdev;
800 }
801
802 return 0;
803}
804
805static int intel_th_output_open(struct inode *inode, struct file *file)
806{
807 const struct file_operations *fops;
808 struct intel_th_driver *thdrv;
809 struct device *dev;
810 int err;
811
812 dev = bus_find_device_by_devt(&intel_th_bus, inode->i_rdev);
813 if (!dev || !dev->driver)
814 return -ENODEV;
815
816 thdrv = to_intel_th_driver(dev->driver);
817 fops = fops_get(thdrv->fops);
818 if (!fops)
819 return -ENODEV;
820
821 replace_fops(file, fops);
822
823 file->private_data = to_intel_th_device(dev);
824
825 if (file->f_op->open) {
826 err = file->f_op->open(inode, file);
827 return err;
828 }
829
830 return 0;
831}
832
833static const struct file_operations intel_th_output_fops = {
834 .open = intel_th_output_open,
835 .llseek = noop_llseek,
836};
837
838static irqreturn_t intel_th_irq(int irq, void *data)
839{
840 struct intel_th *th = data;
841 irqreturn_t ret = IRQ_NONE;
842 struct intel_th_driver *d;
843 int i;
844
845 for (i = 0; i < th->num_thdevs; i++) {
846 if (th->thdev[i]->type != INTEL_TH_OUTPUT)
847 continue;
848
849 d = to_intel_th_driver(th->thdev[i]->dev.driver);
850 if (d && d->irq)
851 ret |= d->irq(th->thdev[i]);
852 }
853
854 return ret;
855}
856
857/**
858 * intel_th_alloc() - allocate a new Intel TH device and its subdevices
859 * @dev: parent device
860 * @devres: resources indexed by th_mmio_idx
861 * @irq: irq number
862 */
863struct intel_th *
864intel_th_alloc(struct device *dev, const struct intel_th_drvdata *drvdata,
865 struct resource *devres, unsigned int ndevres)
866{
867 int err, r, nr_mmios = 0;
868 struct intel_th *th;
869
870 th = kzalloc(sizeof(*th), GFP_KERNEL);
871 if (!th)
872 return ERR_PTR(-ENOMEM);
873
874 th->id = ida_simple_get(&intel_th_ida, 0, 0, GFP_KERNEL);
875 if (th->id < 0) {
876 err = th->id;
877 goto err_alloc;
878 }
879
880 th->major = __register_chrdev(0, 0, TH_POSSIBLE_OUTPUTS,
881 "intel_th/output", &intel_th_output_fops);
882 if (th->major < 0) {
883 err = th->major;
884 goto err_ida;
885 }
886 th->irq = -1;
887 th->dev = dev;
888 th->drvdata = drvdata;
889
890 for (r = 0; r < ndevres; r++)
891 switch (devres[r].flags & IORESOURCE_TYPE_BITS) {
892 case IORESOURCE_MEM:
893 th->resource[nr_mmios++] = devres[r];
894 break;
895 case IORESOURCE_IRQ:
896 err = devm_request_irq(dev, devres[r].start,
897 intel_th_irq, IRQF_SHARED,
898 dev_name(dev), th);
899 if (err)
900 goto err_chrdev;
901
902 if (th->irq == -1)
903 th->irq = devres[r].start;
904 th->num_irqs++;
905 break;
906 default:
907 dev_warn(dev, "Unknown resource type %lx\n",
908 devres[r].flags);
909 break;
910 }
911
912 th->num_resources = nr_mmios;
913
914 dev_set_drvdata(dev, th);
915
916 pm_runtime_no_callbacks(dev);
917 pm_runtime_put(dev);
918 pm_runtime_allow(dev);
919
920 err = intel_th_populate(th);
921 if (err) {
922 /* free the subdevices and undo everything */
923 intel_th_free(th);
924 return ERR_PTR(err);
925 }
926
927 return th;
928
929err_chrdev:
930 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
931 "intel_th/output");
932
933err_ida:
934 ida_simple_remove(&intel_th_ida, th->id);
935
936err_alloc:
937 kfree(th);
938
939 return ERR_PTR(err);
940}
941EXPORT_SYMBOL_GPL(intel_th_alloc);
942
943void intel_th_free(struct intel_th *th)
944{
945 int i;
946
947 intel_th_request_hub_module_flush(th);
948
949 intel_th_device_remove(th->hub);
950 for (i = 0; i < th->num_thdevs; i++) {
951 if (th->thdev[i] != th->hub)
952 intel_th_device_remove(th->thdev[i]);
953 th->thdev[i] = NULL;
954 }
955
956 th->num_thdevs = 0;
957
958 for (i = 0; i < th->num_irqs; i++)
959 devm_free_irq(th->dev, th->irq + i, th);
960
961 pm_runtime_get_sync(th->dev);
962 pm_runtime_forbid(th->dev);
963
964 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
965 "intel_th/output");
966
967 ida_simple_remove(&intel_th_ida, th->id);
968
969 kfree(th);
970}
971EXPORT_SYMBOL_GPL(intel_th_free);
972
973/**
974 * intel_th_trace_enable() - enable tracing for an output device
975 * @thdev: output device that requests tracing be enabled
976 */
977int intel_th_trace_enable(struct intel_th_device *thdev)
978{
979 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
980 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
981
982 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
983 return -EINVAL;
984
985 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
986 return -EINVAL;
987
988 pm_runtime_get_sync(&thdev->dev);
989 hubdrv->enable(hub, &thdev->output);
990
991 return 0;
992}
993EXPORT_SYMBOL_GPL(intel_th_trace_enable);
994
995/**
996 * intel_th_trace_switch() - execute a switch sequence
997 * @thdev: output device that requests tracing switch
998 */
999int intel_th_trace_switch(struct intel_th_device *thdev)
1000{
1001 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
1002 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1003
1004 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
1005 return -EINVAL;
1006
1007 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
1008 return -EINVAL;
1009
1010 hubdrv->trig_switch(hub, &thdev->output);
1011
1012 return 0;
1013}
1014EXPORT_SYMBOL_GPL(intel_th_trace_switch);
1015
1016/**
1017 * intel_th_trace_disable() - disable tracing for an output device
1018 * @thdev: output device that requests tracing be disabled
1019 */
1020int intel_th_trace_disable(struct intel_th_device *thdev)
1021{
1022 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
1023 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1024
1025 WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH);
1026 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
1027 return -EINVAL;
1028
1029 hubdrv->disable(hub, &thdev->output);
1030 pm_runtime_put(&thdev->dev);
1031
1032 return 0;
1033}
1034EXPORT_SYMBOL_GPL(intel_th_trace_disable);
1035
1036int intel_th_set_output(struct intel_th_device *thdev,
1037 unsigned int master)
1038{
1039 struct intel_th_device *hub = to_intel_th_hub(thdev);
1040 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1041 int ret;
1042
1043 /* In host mode, this is up to the external debugger, do nothing. */
1044 if (hub->host_mode)
1045 return 0;
1046
1047 /*
1048 * hub is instantiated together with the source device that
1049 * calls here, so guaranteed to be present.
1050 */
1051 hubdrv = to_intel_th_driver(hub->dev.driver);
1052 if (!hubdrv || !try_module_get(hubdrv->driver.owner))
1053 return -EINVAL;
1054
1055 if (!hubdrv->set_output) {
1056 ret = -ENOTSUPP;
1057 goto out;
1058 }
1059
1060 ret = hubdrv->set_output(hub, master);
1061
1062out:
1063 module_put(hubdrv->driver.owner);
1064 return ret;
1065}
1066EXPORT_SYMBOL_GPL(intel_th_set_output);
1067
1068static int __init intel_th_init(void)
1069{
1070 intel_th_debug_init();
1071
1072 return bus_register(&intel_th_bus);
1073}
1074subsys_initcall(intel_th_init);
1075
1076static void __exit intel_th_exit(void)
1077{
1078 intel_th_debug_done();
1079
1080 bus_unregister(&intel_th_bus);
1081}
1082module_exit(intel_th_exit);
1083
1084MODULE_LICENSE("GPL v2");
1085MODULE_DESCRIPTION("Intel(R) Trace Hub controller driver");
1086MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
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
24static bool host_mode __read_mostly;
25module_param(host_mode, bool, 0444);
26
27static DEFINE_IDA(intel_th_ida);
28
29static 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
41static int intel_th_child_remove(struct device *dev, void *data)
42{
43 device_release_driver(dev);
44
45 return 0;
46}
47
48static 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
85out:
86 if (ret)
87 thdrv->remove(thdev);
88
89out_pm:
90 if (ret)
91 pm_runtime_disable(dev);
92
93 return ret;
94}
95
96static void intel_th_device_remove(struct intel_th_device *thdev);
97
98static 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
104 if (thdev->type == INTEL_TH_SWITCH) {
105 struct intel_th *th = to_intel_th(hub);
106 int i, lowest;
107
108 /*
109 * disconnect outputs
110 *
111 * intel_th_child_remove returns 0 unconditionally, so there is
112 * no need to check the return value of device_for_each_child.
113 */
114 device_for_each_child(dev, thdev, intel_th_child_remove);
115
116 /*
117 * Remove outputs, that is, hub's children: they are created
118 * at hub's probe time by having the hub call
119 * intel_th_output_enable() for each of them.
120 */
121 for (i = 0, lowest = -1; i < th->num_thdevs; i++) {
122 /*
123 * Move the non-output devices from higher up the
124 * th->thdev[] array to lower positions to maintain
125 * a contiguous array.
126 */
127 if (th->thdev[i]->type != INTEL_TH_OUTPUT) {
128 if (lowest >= 0) {
129 th->thdev[lowest] = th->thdev[i];
130 th->thdev[i] = NULL;
131 ++lowest;
132 }
133
134 continue;
135 }
136
137 if (lowest == -1)
138 lowest = i;
139
140 intel_th_device_remove(th->thdev[i]);
141 th->thdev[i] = NULL;
142 }
143
144 if (lowest >= 0)
145 th->num_thdevs = lowest;
146 }
147
148 if (thdrv->attr_group)
149 sysfs_remove_group(&thdev->dev.kobj, thdrv->attr_group);
150
151 pm_runtime_get_sync(dev);
152
153 thdrv->remove(thdev);
154
155 if (intel_th_output_assigned(thdev)) {
156 struct intel_th_driver *hubdrv =
157 to_intel_th_driver(dev->parent->driver);
158
159 if (hub->dev.driver)
160 /* does not talk to hardware */
161 hubdrv->unassign(hub, thdev);
162 }
163
164 pm_runtime_disable(dev);
165 pm_runtime_set_active(dev);
166 pm_runtime_enable(dev);
167
168 return 0;
169}
170
171static struct bus_type intel_th_bus = {
172 .name = "intel_th",
173 .match = intel_th_match,
174 .probe = intel_th_probe,
175 .remove = intel_th_remove,
176};
177
178static void intel_th_device_free(struct intel_th_device *thdev);
179
180static void intel_th_device_release(struct device *dev)
181{
182 intel_th_device_free(to_intel_th_device(dev));
183}
184
185static struct device_type intel_th_source_device_type = {
186 .name = "intel_th_source_device",
187 .release = intel_th_device_release,
188};
189
190static char *intel_th_output_devnode(struct device *dev, umode_t *mode,
191 kuid_t *uid, kgid_t *gid)
192{
193 struct intel_th_device *thdev = to_intel_th_device(dev);
194 struct intel_th *th = to_intel_th(thdev);
195 char *node;
196
197 if (thdev->id >= 0)
198 node = kasprintf(GFP_KERNEL, "intel_th%d/%s%d", th->id,
199 thdev->name, thdev->id);
200 else
201 node = kasprintf(GFP_KERNEL, "intel_th%d/%s", th->id,
202 thdev->name);
203
204 return node;
205}
206
207static ssize_t port_show(struct device *dev, struct device_attribute *attr,
208 char *buf)
209{
210 struct intel_th_device *thdev = to_intel_th_device(dev);
211
212 if (thdev->output.port >= 0)
213 return scnprintf(buf, PAGE_SIZE, "%u\n", thdev->output.port);
214
215 return scnprintf(buf, PAGE_SIZE, "unassigned\n");
216}
217
218static DEVICE_ATTR_RO(port);
219
220static void intel_th_trace_prepare(struct intel_th_device *thdev)
221{
222 struct intel_th_device *hub = to_intel_th_hub(thdev);
223 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
224
225 if (hub->type != INTEL_TH_SWITCH)
226 return;
227
228 if (thdev->type != INTEL_TH_OUTPUT)
229 return;
230
231 pm_runtime_get_sync(&thdev->dev);
232 hubdrv->prepare(hub, &thdev->output);
233 pm_runtime_put(&thdev->dev);
234}
235
236static int intel_th_output_activate(struct intel_th_device *thdev)
237{
238 struct intel_th_driver *thdrv =
239 to_intel_th_driver_or_null(thdev->dev.driver);
240 struct intel_th *th = to_intel_th(thdev);
241 int ret = 0;
242
243 if (!thdrv)
244 return -ENODEV;
245
246 if (!try_module_get(thdrv->driver.owner))
247 return -ENODEV;
248
249 pm_runtime_get_sync(&thdev->dev);
250
251 if (th->activate)
252 ret = th->activate(th);
253 if (ret)
254 goto fail_put;
255
256 intel_th_trace_prepare(thdev);
257 if (thdrv->activate)
258 ret = thdrv->activate(thdev);
259 else
260 intel_th_trace_enable(thdev);
261
262 if (ret)
263 goto fail_deactivate;
264
265 return 0;
266
267fail_deactivate:
268 if (th->deactivate)
269 th->deactivate(th);
270
271fail_put:
272 pm_runtime_put(&thdev->dev);
273 module_put(thdrv->driver.owner);
274
275 return ret;
276}
277
278static void intel_th_output_deactivate(struct intel_th_device *thdev)
279{
280 struct intel_th_driver *thdrv =
281 to_intel_th_driver_or_null(thdev->dev.driver);
282 struct intel_th *th = to_intel_th(thdev);
283
284 if (!thdrv)
285 return;
286
287 if (thdrv->deactivate)
288 thdrv->deactivate(thdev);
289 else
290 intel_th_trace_disable(thdev);
291
292 if (th->deactivate)
293 th->deactivate(th);
294
295 pm_runtime_put(&thdev->dev);
296 module_put(thdrv->driver.owner);
297}
298
299static ssize_t active_show(struct device *dev, struct device_attribute *attr,
300 char *buf)
301{
302 struct intel_th_device *thdev = to_intel_th_device(dev);
303
304 return scnprintf(buf, PAGE_SIZE, "%d\n", thdev->output.active);
305}
306
307static ssize_t active_store(struct device *dev, struct device_attribute *attr,
308 const char *buf, size_t size)
309{
310 struct intel_th_device *thdev = to_intel_th_device(dev);
311 unsigned long val;
312 int ret;
313
314 ret = kstrtoul(buf, 10, &val);
315 if (ret)
316 return ret;
317
318 if (!!val != thdev->output.active) {
319 if (val)
320 ret = intel_th_output_activate(thdev);
321 else
322 intel_th_output_deactivate(thdev);
323 }
324
325 return ret ? ret : size;
326}
327
328static DEVICE_ATTR_RW(active);
329
330static struct attribute *intel_th_output_attrs[] = {
331 &dev_attr_port.attr,
332 &dev_attr_active.attr,
333 NULL,
334};
335
336ATTRIBUTE_GROUPS(intel_th_output);
337
338static struct device_type intel_th_output_device_type = {
339 .name = "intel_th_output_device",
340 .groups = intel_th_output_groups,
341 .release = intel_th_device_release,
342 .devnode = intel_th_output_devnode,
343};
344
345static struct device_type intel_th_switch_device_type = {
346 .name = "intel_th_switch_device",
347 .release = intel_th_device_release,
348};
349
350static struct device_type *intel_th_device_type[] = {
351 [INTEL_TH_SOURCE] = &intel_th_source_device_type,
352 [INTEL_TH_OUTPUT] = &intel_th_output_device_type,
353 [INTEL_TH_SWITCH] = &intel_th_switch_device_type,
354};
355
356int intel_th_driver_register(struct intel_th_driver *thdrv)
357{
358 if (!thdrv->probe || !thdrv->remove)
359 return -EINVAL;
360
361 thdrv->driver.bus = &intel_th_bus;
362
363 return driver_register(&thdrv->driver);
364}
365EXPORT_SYMBOL_GPL(intel_th_driver_register);
366
367void intel_th_driver_unregister(struct intel_th_driver *thdrv)
368{
369 driver_unregister(&thdrv->driver);
370}
371EXPORT_SYMBOL_GPL(intel_th_driver_unregister);
372
373static struct intel_th_device *
374intel_th_device_alloc(struct intel_th *th, unsigned int type, const char *name,
375 int id)
376{
377 struct device *parent;
378 struct intel_th_device *thdev;
379
380 if (type == INTEL_TH_OUTPUT)
381 parent = &th->hub->dev;
382 else
383 parent = th->dev;
384
385 thdev = kzalloc(sizeof(*thdev) + strlen(name) + 1, GFP_KERNEL);
386 if (!thdev)
387 return NULL;
388
389 thdev->id = id;
390 thdev->type = type;
391
392 strcpy(thdev->name, name);
393 device_initialize(&thdev->dev);
394 thdev->dev.bus = &intel_th_bus;
395 thdev->dev.type = intel_th_device_type[type];
396 thdev->dev.parent = parent;
397 thdev->dev.dma_mask = parent->dma_mask;
398 thdev->dev.dma_parms = parent->dma_parms;
399 dma_set_coherent_mask(&thdev->dev, parent->coherent_dma_mask);
400 if (id >= 0)
401 dev_set_name(&thdev->dev, "%d-%s%d", th->id, name, id);
402 else
403 dev_set_name(&thdev->dev, "%d-%s", th->id, name);
404
405 return thdev;
406}
407
408static int intel_th_device_add_resources(struct intel_th_device *thdev,
409 struct resource *res, int nres)
410{
411 struct resource *r;
412
413 r = kmemdup(res, sizeof(*res) * nres, GFP_KERNEL);
414 if (!r)
415 return -ENOMEM;
416
417 thdev->resource = r;
418 thdev->num_resources = nres;
419
420 return 0;
421}
422
423static void intel_th_device_remove(struct intel_th_device *thdev)
424{
425 device_del(&thdev->dev);
426 put_device(&thdev->dev);
427}
428
429static void intel_th_device_free(struct intel_th_device *thdev)
430{
431 kfree(thdev->resource);
432 kfree(thdev);
433}
434
435/*
436 * Intel(R) Trace Hub subdevices
437 */
438static const struct intel_th_subdevice {
439 const char *name;
440 struct resource res[3];
441 unsigned nres;
442 unsigned type;
443 unsigned otype;
444 bool mknode;
445 unsigned scrpd;
446 int id;
447} intel_th_subdevices[] = {
448 {
449 .nres = 1,
450 .res = {
451 {
452 /* Handle TSCU and CTS from GTH driver */
453 .start = REG_GTH_OFFSET,
454 .end = REG_CTS_OFFSET + REG_CTS_LENGTH - 1,
455 .flags = IORESOURCE_MEM,
456 },
457 },
458 .name = "gth",
459 .type = INTEL_TH_SWITCH,
460 .id = -1,
461 },
462 {
463 .nres = 2,
464 .res = {
465 {
466 .start = REG_MSU_OFFSET,
467 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
468 .flags = IORESOURCE_MEM,
469 },
470 {
471 .start = BUF_MSU_OFFSET,
472 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
473 .flags = IORESOURCE_MEM,
474 },
475 },
476 .name = "msc",
477 .id = 0,
478 .type = INTEL_TH_OUTPUT,
479 .mknode = true,
480 .otype = GTH_MSU,
481 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC0_IS_ENABLED,
482 },
483 {
484 .nres = 2,
485 .res = {
486 {
487 .start = REG_MSU_OFFSET,
488 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
489 .flags = IORESOURCE_MEM,
490 },
491 {
492 .start = BUF_MSU_OFFSET,
493 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
494 .flags = IORESOURCE_MEM,
495 },
496 },
497 .name = "msc",
498 .id = 1,
499 .type = INTEL_TH_OUTPUT,
500 .mknode = true,
501 .otype = GTH_MSU,
502 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC1_IS_ENABLED,
503 },
504 {
505 .nres = 2,
506 .res = {
507 {
508 .start = REG_STH_OFFSET,
509 .end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
510 .flags = IORESOURCE_MEM,
511 },
512 {
513 .start = TH_MMIO_SW,
514 .end = 0,
515 .flags = IORESOURCE_MEM,
516 },
517 },
518 .id = -1,
519 .name = "sth",
520 .type = INTEL_TH_SOURCE,
521 },
522 {
523 .nres = 2,
524 .res = {
525 {
526 .start = REG_STH_OFFSET,
527 .end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
528 .flags = IORESOURCE_MEM,
529 },
530 {
531 .start = TH_MMIO_RTIT,
532 .end = 0,
533 .flags = IORESOURCE_MEM,
534 },
535 },
536 .id = -1,
537 .name = "rtit",
538 .type = INTEL_TH_SOURCE,
539 },
540 {
541 .nres = 1,
542 .res = {
543 {
544 .start = REG_PTI_OFFSET,
545 .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1,
546 .flags = IORESOURCE_MEM,
547 },
548 },
549 .id = -1,
550 .name = "pti",
551 .type = INTEL_TH_OUTPUT,
552 .otype = GTH_PTI,
553 .scrpd = SCRPD_PTI_IS_PRIM_DEST,
554 },
555 {
556 .nres = 1,
557 .res = {
558 {
559 .start = REG_PTI_OFFSET,
560 .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1,
561 .flags = IORESOURCE_MEM,
562 },
563 },
564 .id = -1,
565 .name = "lpp",
566 .type = INTEL_TH_OUTPUT,
567 .otype = GTH_LPP,
568 .scrpd = SCRPD_PTI_IS_PRIM_DEST,
569 },
570 {
571 .nres = 1,
572 .res = {
573 {
574 .start = REG_DCIH_OFFSET,
575 .end = REG_DCIH_OFFSET + REG_DCIH_LENGTH - 1,
576 .flags = IORESOURCE_MEM,
577 },
578 },
579 .id = -1,
580 .name = "dcih",
581 .type = INTEL_TH_OUTPUT,
582 },
583};
584
585#ifdef CONFIG_MODULES
586static void __intel_th_request_hub_module(struct work_struct *work)
587{
588 struct intel_th *th = container_of(work, struct intel_th,
589 request_module_work);
590
591 request_module("intel_th_%s", th->hub->name);
592}
593
594static int intel_th_request_hub_module(struct intel_th *th)
595{
596 INIT_WORK(&th->request_module_work, __intel_th_request_hub_module);
597 schedule_work(&th->request_module_work);
598
599 return 0;
600}
601
602static void intel_th_request_hub_module_flush(struct intel_th *th)
603{
604 flush_work(&th->request_module_work);
605}
606#else
607static inline int intel_th_request_hub_module(struct intel_th *th)
608{
609 return -EINVAL;
610}
611
612static inline void intel_th_request_hub_module_flush(struct intel_th *th)
613{
614}
615#endif /* CONFIG_MODULES */
616
617static struct intel_th_device *
618intel_th_subdevice_alloc(struct intel_th *th,
619 const struct intel_th_subdevice *subdev)
620{
621 struct intel_th_device *thdev;
622 struct resource res[3];
623 unsigned int req = 0;
624 int r, err;
625
626 thdev = intel_th_device_alloc(th, subdev->type, subdev->name,
627 subdev->id);
628 if (!thdev)
629 return ERR_PTR(-ENOMEM);
630
631 thdev->drvdata = th->drvdata;
632
633 memcpy(res, subdev->res,
634 sizeof(struct resource) * subdev->nres);
635
636 for (r = 0; r < subdev->nres; r++) {
637 struct resource *devres = th->resource;
638 int bar = TH_MMIO_CONFIG;
639
640 /*
641 * Take .end == 0 to mean 'take the whole bar',
642 * .start then tells us which bar it is. Default to
643 * TH_MMIO_CONFIG.
644 */
645 if (!res[r].end && res[r].flags == IORESOURCE_MEM) {
646 bar = res[r].start;
647 err = -ENODEV;
648 if (bar >= th->num_resources)
649 goto fail_put_device;
650 res[r].start = 0;
651 res[r].end = resource_size(&devres[bar]) - 1;
652 }
653
654 if (res[r].flags & IORESOURCE_MEM) {
655 res[r].start += devres[bar].start;
656 res[r].end += devres[bar].start;
657
658 dev_dbg(th->dev, "%s:%d @ %pR\n",
659 subdev->name, r, &res[r]);
660 } else if (res[r].flags & IORESOURCE_IRQ) {
661 /*
662 * Only pass on the IRQ if we have useful interrupts:
663 * the ones that can be configured via MINTCTL.
664 */
665 if (INTEL_TH_CAP(th, has_mintctl) && th->irq != -1)
666 res[r].start = th->irq;
667 }
668 }
669
670 err = intel_th_device_add_resources(thdev, res, subdev->nres);
671 if (err)
672 goto fail_put_device;
673
674 if (subdev->type == INTEL_TH_OUTPUT) {
675 if (subdev->mknode)
676 thdev->dev.devt = MKDEV(th->major, th->num_thdevs);
677 thdev->output.type = subdev->otype;
678 thdev->output.port = -1;
679 thdev->output.scratchpad = subdev->scrpd;
680 } else if (subdev->type == INTEL_TH_SWITCH) {
681 thdev->host_mode =
682 INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
683 th->hub = thdev;
684 }
685
686 err = device_add(&thdev->dev);
687 if (err)
688 goto fail_free_res;
689
690 /* need switch driver to be loaded to enumerate the rest */
691 if (subdev->type == INTEL_TH_SWITCH && !req) {
692 err = intel_th_request_hub_module(th);
693 if (!err)
694 req++;
695 }
696
697 return thdev;
698
699fail_free_res:
700 kfree(thdev->resource);
701
702fail_put_device:
703 put_device(&thdev->dev);
704
705 return ERR_PTR(err);
706}
707
708/**
709 * intel_th_output_enable() - find and enable a device for a given output type
710 * @th: Intel TH instance
711 * @otype: output type
712 *
713 * Go through the unallocated output devices, find the first one whos type
714 * matches @otype and instantiate it. These devices are removed when the hub
715 * device is removed, see intel_th_remove().
716 */
717int intel_th_output_enable(struct intel_th *th, unsigned int otype)
718{
719 struct intel_th_device *thdev;
720 int src = 0, dst = 0;
721
722 for (src = 0, dst = 0; dst <= th->num_thdevs; src++, dst++) {
723 for (; src < ARRAY_SIZE(intel_th_subdevices); src++) {
724 if (intel_th_subdevices[src].type != INTEL_TH_OUTPUT)
725 continue;
726
727 if (intel_th_subdevices[src].otype != otype)
728 continue;
729
730 break;
731 }
732
733 /* no unallocated matching subdevices */
734 if (src == ARRAY_SIZE(intel_th_subdevices))
735 return -ENODEV;
736
737 for (; dst < th->num_thdevs; dst++) {
738 if (th->thdev[dst]->type != INTEL_TH_OUTPUT)
739 continue;
740
741 if (th->thdev[dst]->output.type != otype)
742 continue;
743
744 break;
745 }
746
747 /*
748 * intel_th_subdevices[src] matches our requirements and is
749 * not matched in th::thdev[]
750 */
751 if (dst == th->num_thdevs)
752 goto found;
753 }
754
755 return -ENODEV;
756
757found:
758 thdev = intel_th_subdevice_alloc(th, &intel_th_subdevices[src]);
759 if (IS_ERR(thdev))
760 return PTR_ERR(thdev);
761
762 th->thdev[th->num_thdevs++] = thdev;
763
764 return 0;
765}
766EXPORT_SYMBOL_GPL(intel_th_output_enable);
767
768static int intel_th_populate(struct intel_th *th)
769{
770 int src;
771
772 /* create devices for each intel_th_subdevice */
773 for (src = 0; src < ARRAY_SIZE(intel_th_subdevices); src++) {
774 const struct intel_th_subdevice *subdev =
775 &intel_th_subdevices[src];
776 struct intel_th_device *thdev;
777
778 /* only allow SOURCE and SWITCH devices in host mode */
779 if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
780 subdev->type == INTEL_TH_OUTPUT)
781 continue;
782
783 /*
784 * don't enable port OUTPUTs in this path; SWITCH enables them
785 * via intel_th_output_enable()
786 */
787 if (subdev->type == INTEL_TH_OUTPUT &&
788 subdev->otype != GTH_NONE)
789 continue;
790
791 thdev = intel_th_subdevice_alloc(th, subdev);
792 /* note: caller should free subdevices from th::thdev[] */
793 if (IS_ERR(thdev)) {
794 /* ENODEV for individual subdevices is allowed */
795 if (PTR_ERR(thdev) == -ENODEV)
796 continue;
797
798 return PTR_ERR(thdev);
799 }
800
801 th->thdev[th->num_thdevs++] = thdev;
802 }
803
804 return 0;
805}
806
807static int intel_th_output_open(struct inode *inode, struct file *file)
808{
809 const struct file_operations *fops;
810 struct intel_th_driver *thdrv;
811 struct device *dev;
812 int err;
813
814 dev = bus_find_device_by_devt(&intel_th_bus, inode->i_rdev);
815 if (!dev || !dev->driver)
816 return -ENODEV;
817
818 thdrv = to_intel_th_driver(dev->driver);
819 fops = fops_get(thdrv->fops);
820 if (!fops)
821 return -ENODEV;
822
823 replace_fops(file, fops);
824
825 file->private_data = to_intel_th_device(dev);
826
827 if (file->f_op->open) {
828 err = file->f_op->open(inode, file);
829 return err;
830 }
831
832 return 0;
833}
834
835static const struct file_operations intel_th_output_fops = {
836 .open = intel_th_output_open,
837 .llseek = noop_llseek,
838};
839
840static irqreturn_t intel_th_irq(int irq, void *data)
841{
842 struct intel_th *th = data;
843 irqreturn_t ret = IRQ_NONE;
844 struct intel_th_driver *d;
845 int i;
846
847 for (i = 0; i < th->num_thdevs; i++) {
848 if (th->thdev[i]->type != INTEL_TH_OUTPUT)
849 continue;
850
851 d = to_intel_th_driver(th->thdev[i]->dev.driver);
852 if (d && d->irq)
853 ret |= d->irq(th->thdev[i]);
854 }
855
856 return ret;
857}
858
859/**
860 * intel_th_alloc() - allocate a new Intel TH device and its subdevices
861 * @dev: parent device
862 * @devres: resources indexed by th_mmio_idx
863 * @irq: irq number
864 */
865struct intel_th *
866intel_th_alloc(struct device *dev, const struct intel_th_drvdata *drvdata,
867 struct resource *devres, unsigned int ndevres)
868{
869 int err, r, nr_mmios = 0;
870 struct intel_th *th;
871
872 th = kzalloc(sizeof(*th), GFP_KERNEL);
873 if (!th)
874 return ERR_PTR(-ENOMEM);
875
876 th->id = ida_simple_get(&intel_th_ida, 0, 0, GFP_KERNEL);
877 if (th->id < 0) {
878 err = th->id;
879 goto err_alloc;
880 }
881
882 th->major = __register_chrdev(0, 0, TH_POSSIBLE_OUTPUTS,
883 "intel_th/output", &intel_th_output_fops);
884 if (th->major < 0) {
885 err = th->major;
886 goto err_ida;
887 }
888 th->irq = -1;
889 th->dev = dev;
890 th->drvdata = drvdata;
891
892 for (r = 0; r < ndevres; r++)
893 switch (devres[r].flags & IORESOURCE_TYPE_BITS) {
894 case IORESOURCE_MEM:
895 th->resource[nr_mmios++] = devres[r];
896 break;
897 case IORESOURCE_IRQ:
898 err = devm_request_irq(dev, devres[r].start,
899 intel_th_irq, IRQF_SHARED,
900 dev_name(dev), th);
901 if (err)
902 goto err_chrdev;
903
904 if (th->irq == -1)
905 th->irq = devres[r].start;
906 th->num_irqs++;
907 break;
908 default:
909 dev_warn(dev, "Unknown resource type %lx\n",
910 devres[r].flags);
911 break;
912 }
913
914 th->num_resources = nr_mmios;
915
916 dev_set_drvdata(dev, th);
917
918 pm_runtime_no_callbacks(dev);
919 pm_runtime_put(dev);
920 pm_runtime_allow(dev);
921
922 err = intel_th_populate(th);
923 if (err) {
924 /* free the subdevices and undo everything */
925 intel_th_free(th);
926 return ERR_PTR(err);
927 }
928
929 return th;
930
931err_chrdev:
932 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
933 "intel_th/output");
934
935err_ida:
936 ida_simple_remove(&intel_th_ida, th->id);
937
938err_alloc:
939 kfree(th);
940
941 return ERR_PTR(err);
942}
943EXPORT_SYMBOL_GPL(intel_th_alloc);
944
945void intel_th_free(struct intel_th *th)
946{
947 int i;
948
949 intel_th_request_hub_module_flush(th);
950
951 intel_th_device_remove(th->hub);
952 for (i = 0; i < th->num_thdevs; i++) {
953 if (th->thdev[i] != th->hub)
954 intel_th_device_remove(th->thdev[i]);
955 th->thdev[i] = NULL;
956 }
957
958 th->num_thdevs = 0;
959
960 for (i = 0; i < th->num_irqs; i++)
961 devm_free_irq(th->dev, th->irq + i, th);
962
963 pm_runtime_get_sync(th->dev);
964 pm_runtime_forbid(th->dev);
965
966 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
967 "intel_th/output");
968
969 ida_simple_remove(&intel_th_ida, th->id);
970
971 kfree(th);
972}
973EXPORT_SYMBOL_GPL(intel_th_free);
974
975/**
976 * intel_th_trace_enable() - enable tracing for an output device
977 * @thdev: output device that requests tracing be enabled
978 */
979int intel_th_trace_enable(struct intel_th_device *thdev)
980{
981 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
982 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
983
984 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
985 return -EINVAL;
986
987 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
988 return -EINVAL;
989
990 pm_runtime_get_sync(&thdev->dev);
991 hubdrv->enable(hub, &thdev->output);
992
993 return 0;
994}
995EXPORT_SYMBOL_GPL(intel_th_trace_enable);
996
997/**
998 * intel_th_trace_switch() - execute a switch sequence
999 * @thdev: output device that requests tracing switch
1000 */
1001int intel_th_trace_switch(struct intel_th_device *thdev)
1002{
1003 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
1004 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1005
1006 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
1007 return -EINVAL;
1008
1009 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
1010 return -EINVAL;
1011
1012 hubdrv->trig_switch(hub, &thdev->output);
1013
1014 return 0;
1015}
1016EXPORT_SYMBOL_GPL(intel_th_trace_switch);
1017
1018/**
1019 * intel_th_trace_disable() - disable tracing for an output device
1020 * @thdev: output device that requests tracing be disabled
1021 */
1022int intel_th_trace_disable(struct intel_th_device *thdev)
1023{
1024 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
1025 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1026
1027 WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH);
1028 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
1029 return -EINVAL;
1030
1031 hubdrv->disable(hub, &thdev->output);
1032 pm_runtime_put(&thdev->dev);
1033
1034 return 0;
1035}
1036EXPORT_SYMBOL_GPL(intel_th_trace_disable);
1037
1038int intel_th_set_output(struct intel_th_device *thdev,
1039 unsigned int master)
1040{
1041 struct intel_th_device *hub = to_intel_th_hub(thdev);
1042 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1043 int ret;
1044
1045 /* In host mode, this is up to the external debugger, do nothing. */
1046 if (hub->host_mode)
1047 return 0;
1048
1049 /*
1050 * hub is instantiated together with the source device that
1051 * calls here, so guaranteed to be present.
1052 */
1053 hubdrv = to_intel_th_driver(hub->dev.driver);
1054 if (!hubdrv || !try_module_get(hubdrv->driver.owner))
1055 return -EINVAL;
1056
1057 if (!hubdrv->set_output) {
1058 ret = -ENOTSUPP;
1059 goto out;
1060 }
1061
1062 ret = hubdrv->set_output(hub, master);
1063
1064out:
1065 module_put(hubdrv->driver.owner);
1066 return ret;
1067}
1068EXPORT_SYMBOL_GPL(intel_th_set_output);
1069
1070static int __init intel_th_init(void)
1071{
1072 intel_th_debug_init();
1073
1074 return bus_register(&intel_th_bus);
1075}
1076subsys_initcall(intel_th_init);
1077
1078static void __exit intel_th_exit(void)
1079{
1080 intel_th_debug_done();
1081
1082 bus_unregister(&intel_th_bus);
1083}
1084module_exit(intel_th_exit);
1085
1086MODULE_LICENSE("GPL v2");
1087MODULE_DESCRIPTION("Intel(R) Trace Hub controller driver");
1088MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");