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