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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 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
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 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
248fail_deactivate:
249 if (th->deactivate)
250 th->deactivate(th);
251
252fail_put:
253 pm_runtime_put(&thdev->dev);
254 module_put(thdrv->driver.owner);
255
256 return ret;
257}
258
259static 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
280static 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
288static 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
309static DEVICE_ATTR_RW(active);
310
311static struct attribute *intel_th_output_attrs[] = {
312 &dev_attr_port.attr,
313 &dev_attr_active.attr,
314 NULL,
315};
316
317ATTRIBUTE_GROUPS(intel_th_output);
318
319static 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
326static struct device_type intel_th_switch_device_type = {
327 .name = "intel_th_switch_device",
328 .release = intel_th_device_release,
329};
330
331static 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
337int 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}
346EXPORT_SYMBOL_GPL(intel_th_driver_register);
347
348void intel_th_driver_unregister(struct intel_th_driver *thdrv)
349{
350 driver_unregister(&thdrv->driver);
351}
352EXPORT_SYMBOL_GPL(intel_th_driver_unregister);
353
354static struct intel_th_device *
355intel_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
389static 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
404static void intel_th_device_remove(struct intel_th_device *thdev)
405{
406 device_del(&thdev->dev);
407 put_device(&thdev->dev);
408}
409
410static 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 */
419static 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
567static 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
575static 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
583static void intel_th_request_hub_module_flush(struct intel_th *th)
584{
585 flush_work(&th->request_module_work);
586}
587#else
588static inline int intel_th_request_hub_module(struct intel_th *th)
589{
590 return -EINVAL;
591}
592
593static inline void intel_th_request_hub_module_flush(struct intel_th *th)
594{
595}
596#endif /* CONFIG_MODULES */
597
598static struct intel_th_device *
599intel_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 put_device(&thdev->dev);
654 goto fail_put_device;
655 }
656
657 if (subdev->type == INTEL_TH_OUTPUT) {
658 if (subdev->mknode)
659 thdev->dev.devt = MKDEV(th->major, th->num_thdevs);
660 thdev->output.type = subdev->otype;
661 thdev->output.port = -1;
662 thdev->output.scratchpad = subdev->scrpd;
663 } else if (subdev->type == INTEL_TH_SWITCH) {
664 thdev->host_mode =
665 INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
666 th->hub = thdev;
667 }
668
669 err = device_add(&thdev->dev);
670 if (err) {
671 put_device(&thdev->dev);
672 goto fail_free_res;
673 }
674
675 /* need switch driver to be loaded to enumerate the rest */
676 if (subdev->type == INTEL_TH_SWITCH && !req) {
677 err = intel_th_request_hub_module(th);
678 if (!err)
679 req++;
680 }
681
682 return thdev;
683
684fail_free_res:
685 kfree(thdev->resource);
686
687fail_put_device:
688 put_device(&thdev->dev);
689
690 return ERR_PTR(err);
691}
692
693/**
694 * intel_th_output_enable() - find and enable a device for a given output type
695 * @th: Intel TH instance
696 * @otype: output type
697 *
698 * Go through the unallocated output devices, find the first one whos type
699 * matches @otype and instantiate it. These devices are removed when the hub
700 * device is removed, see intel_th_remove().
701 */
702int intel_th_output_enable(struct intel_th *th, unsigned int otype)
703{
704 struct intel_th_device *thdev;
705 int src = 0, dst = 0;
706
707 for (src = 0, dst = 0; dst <= th->num_thdevs; src++, dst++) {
708 for (; src < ARRAY_SIZE(intel_th_subdevices); src++) {
709 if (intel_th_subdevices[src].type != INTEL_TH_OUTPUT)
710 continue;
711
712 if (intel_th_subdevices[src].otype != otype)
713 continue;
714
715 break;
716 }
717
718 /* no unallocated matching subdevices */
719 if (src == ARRAY_SIZE(intel_th_subdevices))
720 return -ENODEV;
721
722 for (; dst < th->num_thdevs; dst++) {
723 if (th->thdev[dst]->type != INTEL_TH_OUTPUT)
724 continue;
725
726 if (th->thdev[dst]->output.type != otype)
727 continue;
728
729 break;
730 }
731
732 /*
733 * intel_th_subdevices[src] matches our requirements and is
734 * not matched in th::thdev[]
735 */
736 if (dst == th->num_thdevs)
737 goto found;
738 }
739
740 return -ENODEV;
741
742found:
743 thdev = intel_th_subdevice_alloc(th, &intel_th_subdevices[src]);
744 if (IS_ERR(thdev))
745 return PTR_ERR(thdev);
746
747 th->thdev[th->num_thdevs++] = thdev;
748
749 return 0;
750}
751EXPORT_SYMBOL_GPL(intel_th_output_enable);
752
753static int intel_th_populate(struct intel_th *th)
754{
755 int src;
756
757 /* create devices for each intel_th_subdevice */
758 for (src = 0; src < ARRAY_SIZE(intel_th_subdevices); src++) {
759 const struct intel_th_subdevice *subdev =
760 &intel_th_subdevices[src];
761 struct intel_th_device *thdev;
762
763 /* only allow SOURCE and SWITCH devices in host mode */
764 if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
765 subdev->type == INTEL_TH_OUTPUT)
766 continue;
767
768 /*
769 * don't enable port OUTPUTs in this path; SWITCH enables them
770 * via intel_th_output_enable()
771 */
772 if (subdev->type == INTEL_TH_OUTPUT &&
773 subdev->otype != GTH_NONE)
774 continue;
775
776 thdev = intel_th_subdevice_alloc(th, subdev);
777 /* note: caller should free subdevices from th::thdev[] */
778 if (IS_ERR(thdev)) {
779 /* ENODEV for individual subdevices is allowed */
780 if (PTR_ERR(thdev) == -ENODEV)
781 continue;
782
783 return PTR_ERR(thdev);
784 }
785
786 th->thdev[th->num_thdevs++] = thdev;
787 }
788
789 return 0;
790}
791
792static int intel_th_output_open(struct inode *inode, struct file *file)
793{
794 const struct file_operations *fops;
795 struct intel_th_driver *thdrv;
796 struct device *dev;
797 int err;
798
799 dev = bus_find_device_by_devt(&intel_th_bus, inode->i_rdev);
800 if (!dev || !dev->driver)
801 return -ENODEV;
802
803 thdrv = to_intel_th_driver(dev->driver);
804 fops = fops_get(thdrv->fops);
805 if (!fops)
806 return -ENODEV;
807
808 replace_fops(file, fops);
809
810 file->private_data = to_intel_th_device(dev);
811
812 if (file->f_op->open) {
813 err = file->f_op->open(inode, file);
814 return err;
815 }
816
817 return 0;
818}
819
820static const struct file_operations intel_th_output_fops = {
821 .open = intel_th_output_open,
822 .llseek = noop_llseek,
823};
824
825static irqreturn_t intel_th_irq(int irq, void *data)
826{
827 struct intel_th *th = data;
828 irqreturn_t ret = IRQ_NONE;
829 struct intel_th_driver *d;
830 int i;
831
832 for (i = 0; i < th->num_thdevs; i++) {
833 if (th->thdev[i]->type != INTEL_TH_OUTPUT)
834 continue;
835
836 d = to_intel_th_driver(th->thdev[i]->dev.driver);
837 if (d && d->irq)
838 ret |= d->irq(th->thdev[i]);
839 }
840
841 if (ret == IRQ_NONE)
842 pr_warn_ratelimited("nobody cared for irq\n");
843
844 return ret;
845}
846
847/**
848 * intel_th_alloc() - allocate a new Intel TH device and its subdevices
849 * @dev: parent device
850 * @devres: resources indexed by th_mmio_idx
851 * @irq: irq number
852 */
853struct intel_th *
854intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata,
855 struct resource *devres, unsigned int ndevres)
856{
857 int err, r, nr_mmios = 0;
858 struct intel_th *th;
859
860 th = kzalloc(sizeof(*th), GFP_KERNEL);
861 if (!th)
862 return ERR_PTR(-ENOMEM);
863
864 th->id = ida_simple_get(&intel_th_ida, 0, 0, GFP_KERNEL);
865 if (th->id < 0) {
866 err = th->id;
867 goto err_alloc;
868 }
869
870 th->major = __register_chrdev(0, 0, TH_POSSIBLE_OUTPUTS,
871 "intel_th/output", &intel_th_output_fops);
872 if (th->major < 0) {
873 err = th->major;
874 goto err_ida;
875 }
876 th->irq = -1;
877 th->dev = dev;
878 th->drvdata = drvdata;
879
880 for (r = 0; r < ndevres; r++)
881 switch (devres[r].flags & IORESOURCE_TYPE_BITS) {
882 case IORESOURCE_MEM:
883 th->resource[nr_mmios++] = devres[r];
884 break;
885 case IORESOURCE_IRQ:
886 err = devm_request_irq(dev, devres[r].start,
887 intel_th_irq, IRQF_SHARED,
888 dev_name(dev), th);
889 if (err)
890 goto err_chrdev;
891
892 if (th->irq == -1)
893 th->irq = devres[r].start;
894 break;
895 default:
896 dev_warn(dev, "Unknown resource type %lx\n",
897 devres[r].flags);
898 break;
899 }
900
901 th->num_resources = nr_mmios;
902
903 dev_set_drvdata(dev, th);
904
905 pm_runtime_no_callbacks(dev);
906 pm_runtime_put(dev);
907 pm_runtime_allow(dev);
908
909 err = intel_th_populate(th);
910 if (err) {
911 /* free the subdevices and undo everything */
912 intel_th_free(th);
913 return ERR_PTR(err);
914 }
915
916 return th;
917
918err_chrdev:
919 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
920 "intel_th/output");
921
922err_ida:
923 ida_simple_remove(&intel_th_ida, th->id);
924
925err_alloc:
926 kfree(th);
927
928 return ERR_PTR(err);
929}
930EXPORT_SYMBOL_GPL(intel_th_alloc);
931
932void intel_th_free(struct intel_th *th)
933{
934 int i;
935
936 intel_th_request_hub_module_flush(th);
937
938 intel_th_device_remove(th->hub);
939 for (i = 0; i < th->num_thdevs; i++) {
940 if (th->thdev[i] != th->hub)
941 intel_th_device_remove(th->thdev[i]);
942 th->thdev[i] = NULL;
943 }
944
945 th->num_thdevs = 0;
946
947 pm_runtime_get_sync(th->dev);
948 pm_runtime_forbid(th->dev);
949
950 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
951 "intel_th/output");
952
953 ida_simple_remove(&intel_th_ida, th->id);
954
955 kfree(th);
956}
957EXPORT_SYMBOL_GPL(intel_th_free);
958
959/**
960 * intel_th_trace_enable() - enable tracing for an output device
961 * @thdev: output device that requests tracing be enabled
962 */
963int intel_th_trace_enable(struct intel_th_device *thdev)
964{
965 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
966 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
967
968 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
969 return -EINVAL;
970
971 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
972 return -EINVAL;
973
974 pm_runtime_get_sync(&thdev->dev);
975 hubdrv->enable(hub, &thdev->output);
976
977 return 0;
978}
979EXPORT_SYMBOL_GPL(intel_th_trace_enable);
980
981/**
982 * intel_th_trace_switch() - execute a switch sequence
983 * @thdev: output device that requests tracing switch
984 */
985int intel_th_trace_switch(struct intel_th_device *thdev)
986{
987 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
988 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
989
990 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
991 return -EINVAL;
992
993 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
994 return -EINVAL;
995
996 hubdrv->trig_switch(hub, &thdev->output);
997
998 return 0;
999}
1000EXPORT_SYMBOL_GPL(intel_th_trace_switch);
1001
1002/**
1003 * intel_th_trace_disable() - disable tracing for an output device
1004 * @thdev: output device that requests tracing be disabled
1005 */
1006int intel_th_trace_disable(struct intel_th_device *thdev)
1007{
1008 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
1009 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1010
1011 WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH);
1012 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
1013 return -EINVAL;
1014
1015 hubdrv->disable(hub, &thdev->output);
1016 pm_runtime_put(&thdev->dev);
1017
1018 return 0;
1019}
1020EXPORT_SYMBOL_GPL(intel_th_trace_disable);
1021
1022int intel_th_set_output(struct intel_th_device *thdev,
1023 unsigned int master)
1024{
1025 struct intel_th_device *hub = to_intel_th_hub(thdev);
1026 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
1027
1028 /* In host mode, this is up to the external debugger, do nothing. */
1029 if (hub->host_mode)
1030 return 0;
1031
1032 if (!hubdrv->set_output)
1033 return -ENOTSUPP;
1034
1035 return hubdrv->set_output(hub, master);
1036}
1037EXPORT_SYMBOL_GPL(intel_th_set_output);
1038
1039static int __init intel_th_init(void)
1040{
1041 intel_th_debug_init();
1042
1043 return bus_register(&intel_th_bus);
1044}
1045subsys_initcall(intel_th_init);
1046
1047static void __exit intel_th_exit(void)
1048{
1049 intel_th_debug_done();
1050
1051 bus_unregister(&intel_th_bus);
1052}
1053module_exit(intel_th_exit);
1054
1055MODULE_LICENSE("GPL v2");
1056MODULE_DESCRIPTION("Intel(R) Trace Hub controller driver");
1057MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");