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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / hwtracing / intel_th / core.c
blob4272f2ce5f6eef8e2c0b4309137f9c828bb9db14
1 /*
2 * Intel(R) Trace Hub driver core
3 *
4 * Copyright (C) 2014-2015 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/types.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/sysfs.h>
22 #include <linux/kdev_t.h>
23 #include <linux/debugfs.h>
24 #include <linux/idr.h>
25 #include <linux/pci.h>
26 #include <linux/dma-mapping.h>
27
28 #include "intel_th.h"
29 #include "debug.h"
30
31 static DEFINE_IDA(intel_th_ida);
32
33 static int intel_th_match(struct device *dev, struct device_driver *driver)
34 {
35 struct intel_th_driver *thdrv = to_intel_th_driver(driver);
36 struct intel_th_device *thdev = to_intel_th_device(dev);
37
38 if (thdev->type == INTEL_TH_SWITCH &&
39 (!thdrv->enable || !thdrv->disable))
40 return 0;
41
42 return !strcmp(thdev->name, driver->name);
43 }
44
45 static int intel_th_child_remove(struct device *dev, void *data)
46 {
47 device_release_driver(dev);
48
49 return 0;
50 }
51
52 static int intel_th_probe(struct device *dev)
53 {
54 struct intel_th_driver *thdrv = to_intel_th_driver(dev->driver);
55 struct intel_th_device *thdev = to_intel_th_device(dev);
56 struct intel_th_driver *hubdrv;
57 struct intel_th_device *hub = NULL;
58 int ret;
59
60 if (thdev->type == INTEL_TH_SWITCH)
61 hub = thdev;
62 else if (dev->parent)
63 hub = to_intel_th_device(dev->parent);
64
65 if (!hub || !hub->dev.driver)
66 return -EPROBE_DEFER;
67
68 hubdrv = to_intel_th_driver(hub->dev.driver);
69
70 ret = thdrv->probe(to_intel_th_device(dev));
71 if (ret)
72 return ret;
73
74 if (thdev->type == INTEL_TH_OUTPUT &&
75 !intel_th_output_assigned(thdev))
76 ret = hubdrv->assign(hub, thdev);
77
78 return ret;
79 }
80
81 static int intel_th_remove(struct device *dev)
82 {
83 struct intel_th_driver *thdrv = to_intel_th_driver(dev->driver);
84 struct intel_th_device *thdev = to_intel_th_device(dev);
85 struct intel_th_device *hub = to_intel_th_device(dev->parent);
86 int err;
87
88 if (thdev->type == INTEL_TH_SWITCH) {
89 err = device_for_each_child(dev, thdev, intel_th_child_remove);
90 if (err)
91 return err;
92 }
93
94 thdrv->remove(thdev);
95
96 if (intel_th_output_assigned(thdev)) {
97 struct intel_th_driver *hubdrv =
98 to_intel_th_driver(dev->parent->driver);
99
100 if (hub->dev.driver)
101 hubdrv->unassign(hub, thdev);
102 }
103
104 return 0;
105 }
106
107 static struct bus_type intel_th_bus = {
108 .name = "intel_th",
109 .dev_attrs = NULL,
110 .match = intel_th_match,
111 .probe = intel_th_probe,
112 .remove = intel_th_remove,
113 };
114
115 static void intel_th_device_free(struct intel_th_device *thdev);
116
117 static void intel_th_device_release(struct device *dev)
118 {
119 intel_th_device_free(to_intel_th_device(dev));
120 }
121
122 static struct device_type intel_th_source_device_type = {
123 .name = "intel_th_source_device",
124 .release = intel_th_device_release,
125 };
126
127 static struct intel_th *to_intel_th(struct intel_th_device *thdev)
128 {
129 /*
130 * subdevice tree is flat: if this one is not a switch, its
131 * parent must be
132 */
133 if (thdev->type != INTEL_TH_SWITCH)
134 thdev = to_intel_th_hub(thdev);
135
136 if (WARN_ON_ONCE(!thdev || thdev->type != INTEL_TH_SWITCH))
137 return NULL;
138
139 return dev_get_drvdata(thdev->dev.parent);
140 }
141
142 static char *intel_th_output_devnode(struct device *dev, umode_t *mode,
143 kuid_t *uid, kgid_t *gid)
144 {
145 struct intel_th_device *thdev = to_intel_th_device(dev);
146 struct intel_th *th = to_intel_th(thdev);
147 char *node;
148
149 if (thdev->id >= 0)
150 node = kasprintf(GFP_KERNEL, "intel_th%d/%s%d", th->id,
151 thdev->name, thdev->id);
152 else
153 node = kasprintf(GFP_KERNEL, "intel_th%d/%s", th->id,
154 thdev->name);
155
156 return node;
157 }
158
159 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
160 char *buf)
161 {
162 struct intel_th_device *thdev = to_intel_th_device(dev);
163
164 if (thdev->output.port >= 0)
165 return scnprintf(buf, PAGE_SIZE, "%u\n", thdev->output.port);
166
167 return scnprintf(buf, PAGE_SIZE, "unassigned\n");
168 }
169
170 static DEVICE_ATTR_RO(port);
171
172 static int intel_th_output_activate(struct intel_th_device *thdev)
173 {
174 struct intel_th_driver *thdrv = to_intel_th_driver(thdev->dev.driver);
175
176 if (thdrv->activate)
177 return thdrv->activate(thdev);
178
179 intel_th_trace_enable(thdev);
180
181 return 0;
182 }
183
184 static void intel_th_output_deactivate(struct intel_th_device *thdev)
185 {
186 struct intel_th_driver *thdrv = to_intel_th_driver(thdev->dev.driver);
187
188 if (thdrv->deactivate)
189 thdrv->deactivate(thdev);
190 else
191 intel_th_trace_disable(thdev);
192 }
193
194 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
195 char *buf)
196 {
197 struct intel_th_device *thdev = to_intel_th_device(dev);
198
199 return scnprintf(buf, PAGE_SIZE, "%d\n", thdev->output.active);
200 }
201
202 static ssize_t active_store(struct device *dev, struct device_attribute *attr,
203 const char *buf, size_t size)
204 {
205 struct intel_th_device *thdev = to_intel_th_device(dev);
206 unsigned long val;
207 int ret;
208
209 ret = kstrtoul(buf, 10, &val);
210 if (ret)
211 return ret;
212
213 if (!!val != thdev->output.active) {
214 if (val)
215 ret = intel_th_output_activate(thdev);
216 else
217 intel_th_output_deactivate(thdev);
218 }
219
220 return ret ? ret : size;
221 }
222
223 static DEVICE_ATTR_RW(active);
224
225 static struct attribute *intel_th_output_attrs[] = {
226 &dev_attr_port.attr,
227 &dev_attr_active.attr,
228 NULL,
229 };
230
231 ATTRIBUTE_GROUPS(intel_th_output);
232
233 static struct device_type intel_th_output_device_type = {
234 .name = "intel_th_output_device",
235 .groups = intel_th_output_groups,
236 .release = intel_th_device_release,
237 .devnode = intel_th_output_devnode,
238 };
239
240 static struct device_type intel_th_switch_device_type = {
241 .name = "intel_th_switch_device",
242 .release = intel_th_device_release,
243 };
244
245 static struct device_type *intel_th_device_type[] = {
246 [INTEL_TH_SOURCE] = &intel_th_source_device_type,
247 [INTEL_TH_OUTPUT] = &intel_th_output_device_type,
248 [INTEL_TH_SWITCH] = &intel_th_switch_device_type,
249 };
250
251 int intel_th_driver_register(struct intel_th_driver *thdrv)
252 {
253 if (!thdrv->probe || !thdrv->remove)
254 return -EINVAL;
255
256 thdrv->driver.bus = &intel_th_bus;
257
258 return driver_register(&thdrv->driver);
259 }
260 EXPORT_SYMBOL_GPL(intel_th_driver_register);
261
262 void intel_th_driver_unregister(struct intel_th_driver *thdrv)
263 {
264 driver_unregister(&thdrv->driver);
265 }
266 EXPORT_SYMBOL_GPL(intel_th_driver_unregister);
267
268 static struct intel_th_device *
269 intel_th_device_alloc(struct intel_th *th, unsigned int type, const char *name,
270 int id)
271 {
272 struct device *parent;
273 struct intel_th_device *thdev;
274
275 if (type == INTEL_TH_SWITCH)
276 parent = th->dev;
277 else
278 parent = &th->hub->dev;
279
280 thdev = kzalloc(sizeof(*thdev) + strlen(name) + 1, GFP_KERNEL);
281 if (!thdev)
282 return NULL;
283
284 thdev->id = id;
285 thdev->type = type;
286
287 strcpy(thdev->name, name);
288 device_initialize(&thdev->dev);
289 thdev->dev.bus = &intel_th_bus;
290 thdev->dev.type = intel_th_device_type[type];
291 thdev->dev.parent = parent;
292 thdev->dev.dma_mask = parent->dma_mask;
293 thdev->dev.dma_parms = parent->dma_parms;
294 dma_set_coherent_mask(&thdev->dev, parent->coherent_dma_mask);
295 if (id >= 0)
296 dev_set_name(&thdev->dev, "%d-%s%d", th->id, name, id);
297 else
298 dev_set_name(&thdev->dev, "%d-%s", th->id, name);
299
300 return thdev;
301 }
302
303 static int intel_th_device_add_resources(struct intel_th_device *thdev,
304 struct resource *res, int nres)
305 {
306 struct resource *r;
307
308 r = kmemdup(res, sizeof(*res) * nres, GFP_KERNEL);
309 if (!r)
310 return -ENOMEM;
311
312 thdev->resource = r;
313 thdev->num_resources = nres;
314
315 return 0;
316 }
317
318 static void intel_th_device_remove(struct intel_th_device *thdev)
319 {
320 device_del(&thdev->dev);
321 put_device(&thdev->dev);
322 }
323
324 static void intel_th_device_free(struct intel_th_device *thdev)
325 {
326 kfree(thdev->resource);
327 kfree(thdev);
328 }
329
330 /*
331 * Intel(R) Trace Hub subdevices
332 */
333 static struct intel_th_subdevice {
334 const char *name;
335 struct resource res[3];
336 unsigned nres;
337 unsigned type;
338 unsigned otype;
339 unsigned scrpd;
340 int id;
341 } intel_th_subdevices[TH_SUBDEVICE_MAX] = {
342 {
343 .nres = 1,
344 .res = {
345 {
346 .start = REG_GTH_OFFSET,
347 .end = REG_GTH_OFFSET + REG_GTH_LENGTH - 1,
348 .flags = IORESOURCE_MEM,
349 },
350 },
351 .name = "gth",
352 .type = INTEL_TH_SWITCH,
353 .id = -1,
354 },
355 {
356 .nres = 2,
357 .res = {
358 {
359 .start = REG_MSU_OFFSET,
360 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
361 .flags = IORESOURCE_MEM,
362 },
363 {
364 .start = BUF_MSU_OFFSET,
365 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
366 .flags = IORESOURCE_MEM,
367 },
368 },
369 .name = "msc",
370 .id = 0,
371 .type = INTEL_TH_OUTPUT,
372 .otype = GTH_MSU,
373 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC0_IS_ENABLED,
374 },
375 {
376 .nres = 2,
377 .res = {
378 {
379 .start = REG_MSU_OFFSET,
380 .end = REG_MSU_OFFSET + REG_MSU_LENGTH - 1,
381 .flags = IORESOURCE_MEM,
382 },
383 {
384 .start = BUF_MSU_OFFSET,
385 .end = BUF_MSU_OFFSET + BUF_MSU_LENGTH - 1,
386 .flags = IORESOURCE_MEM,
387 },
388 },
389 .name = "msc",
390 .id = 1,
391 .type = INTEL_TH_OUTPUT,
392 .otype = GTH_MSU,
393 .scrpd = SCRPD_MEM_IS_PRIM_DEST | SCRPD_MSC1_IS_ENABLED,
394 },
395 {
396 .nres = 2,
397 .res = {
398 {
399 .start = REG_STH_OFFSET,
400 .end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
401 .flags = IORESOURCE_MEM,
402 },
403 {
404 .start = TH_MMIO_SW,
405 .end = 0,
406 .flags = IORESOURCE_MEM,
407 },
408 },
409 .id = -1,
410 .name = "sth",
411 .type = INTEL_TH_SOURCE,
412 },
413 {
414 .nres = 1,
415 .res = {
416 {
417 .start = REG_PTI_OFFSET,
418 .end = REG_PTI_OFFSET + REG_PTI_LENGTH - 1,
419 .flags = IORESOURCE_MEM,
420 },
421 },
422 .id = -1,
423 .name = "pti",
424 .type = INTEL_TH_OUTPUT,
425 .otype = GTH_PTI,
426 .scrpd = SCRPD_PTI_IS_PRIM_DEST,
427 },
428 {
429 .nres = 1,
430 .res = {
431 {
432 .start = REG_DCIH_OFFSET,
433 .end = REG_DCIH_OFFSET + REG_DCIH_LENGTH - 1,
434 .flags = IORESOURCE_MEM,
435 },
436 },
437 .id = -1,
438 .name = "dcih",
439 .type = INTEL_TH_OUTPUT,
440 },
441 };
442
443 static int intel_th_populate(struct intel_th *th, struct resource *devres,
444 unsigned int ndevres, int irq)
445 {
446 struct resource res[3];
447 unsigned int req = 0;
448 int i, err;
449
450 /* create devices for each intel_th_subdevice */
451 for (i = 0; i < ARRAY_SIZE(intel_th_subdevices); i++) {
452 struct intel_th_subdevice *subdev = &intel_th_subdevices[i];
453 struct intel_th_device *thdev;
454 int r;
455
456 thdev = intel_th_device_alloc(th, subdev->type, subdev->name,
457 subdev->id);
458 if (!thdev) {
459 err = -ENOMEM;
460 goto kill_subdevs;
461 }
462
463 memcpy(res, subdev->res,
464 sizeof(struct resource) * subdev->nres);
465
466 for (r = 0; r < subdev->nres; r++) {
467 int bar = TH_MMIO_CONFIG;
468
469 /*
470 * Take .end == 0 to mean 'take the whole bar',
471 * .start then tells us which bar it is. Default to
472 * TH_MMIO_CONFIG.
473 */
474 if (!res[r].end && res[r].flags == IORESOURCE_MEM) {
475 bar = res[r].start;
476 res[r].start = 0;
477 res[r].end = resource_size(&devres[bar]) - 1;
478 }
479
480 if (res[r].flags & IORESOURCE_MEM) {
481 res[r].start += devres[bar].start;
482 res[r].end += devres[bar].start;
483
484 dev_dbg(th->dev, "%s:%d @ %pR\n",
485 subdev->name, r, &res[r]);
486 } else if (res[r].flags & IORESOURCE_IRQ) {
487 res[r].start = irq;
488 }
489 }
490
491 err = intel_th_device_add_resources(thdev, res, subdev->nres);
492 if (err) {
493 put_device(&thdev->dev);
494 goto kill_subdevs;
495 }
496
497 if (subdev->type == INTEL_TH_OUTPUT) {
498 thdev->dev.devt = MKDEV(th->major, i);
499 thdev->output.type = subdev->otype;
500 thdev->output.port = -1;
501 thdev->output.scratchpad = subdev->scrpd;
502 }
503
504 err = device_add(&thdev->dev);
505 if (err) {
506 put_device(&thdev->dev);
507 goto kill_subdevs;
508 }
509
510 /* need switch driver to be loaded to enumerate the rest */
511 if (subdev->type == INTEL_TH_SWITCH && !req) {
512 th->hub = thdev;
513 err = request_module("intel_th_%s", subdev->name);
514 if (!err)
515 req++;
516 }
517
518 th->thdev[i] = thdev;
519 }
520
521 return 0;
522
523 kill_subdevs:
524 for (i-- ; i >= 0; i--)
525 intel_th_device_remove(th->thdev[i]);
526
527 return err;
528 }
529
530 static int match_devt(struct device *dev, void *data)
531 {
532 dev_t devt = (dev_t)(unsigned long)data;
533
534 return dev->devt == devt;
535 }
536
537 static int intel_th_output_open(struct inode *inode, struct file *file)
538 {
539 const struct file_operations *fops;
540 struct intel_th_driver *thdrv;
541 struct device *dev;
542 int err;
543
544 dev = bus_find_device(&intel_th_bus, NULL,
545 (void *)(unsigned long)inode->i_rdev,
546 match_devt);
547 if (!dev || !dev->driver)
548 return -ENODEV;
549
550 thdrv = to_intel_th_driver(dev->driver);
551 fops = fops_get(thdrv->fops);
552 if (!fops)
553 return -ENODEV;
554
555 replace_fops(file, fops);
556
557 file->private_data = to_intel_th_device(dev);
558
559 if (file->f_op->open) {
560 err = file->f_op->open(inode, file);
561 return err;
562 }
563
564 return 0;
565 }
566
567 static const struct file_operations intel_th_output_fops = {
568 .open = intel_th_output_open,
569 .llseek = noop_llseek,
570 };
571
572 /**
573 * intel_th_alloc() - allocate a new Intel TH device and its subdevices
574 * @dev: parent device
575 * @devres: parent's resources
576 * @ndevres: number of resources
577 * @irq: irq number
578 */
579 struct intel_th *
580 intel_th_alloc(struct device *dev, struct resource *devres,
581 unsigned int ndevres, int irq)
582 {
583 struct intel_th *th;
584 int err;
585
586 th = kzalloc(sizeof(*th), GFP_KERNEL);
587 if (!th)
588 return ERR_PTR(-ENOMEM);
589
590 th->id = ida_simple_get(&intel_th_ida, 0, 0, GFP_KERNEL);
591 if (th->id < 0) {
592 err = th->id;
593 goto err_alloc;
594 }
595
596 th->major = __register_chrdev(0, 0, TH_POSSIBLE_OUTPUTS,
597 "intel_th/output", &intel_th_output_fops);
598 if (th->major < 0) {
599 err = th->major;
600 goto err_ida;
601 }
602 th->dev = dev;
603
604 dev_set_drvdata(dev, th);
605
606 err = intel_th_populate(th, devres, ndevres, irq);
607 if (err)
608 goto err_chrdev;
609
610 return th;
611
612 err_chrdev:
613 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
614 "intel_th/output");
615
616 err_ida:
617 ida_simple_remove(&intel_th_ida, th->id);
618
619 err_alloc:
620 kfree(th);
621
622 return ERR_PTR(err);
623 }
624 EXPORT_SYMBOL_GPL(intel_th_alloc);
625
626 void intel_th_free(struct intel_th *th)
627 {
628 int i;
629
630 for (i = 0; i < TH_SUBDEVICE_MAX; i++)
631 if (th->thdev[i] != th->hub)
632 intel_th_device_remove(th->thdev[i]);
633
634 intel_th_device_remove(th->hub);
635
636 __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
637 "intel_th/output");
638
639 ida_simple_remove(&intel_th_ida, th->id);
640
641 kfree(th);
642 }
643 EXPORT_SYMBOL_GPL(intel_th_free);
644
645 /**
646 * intel_th_trace_enable() - enable tracing for an output device
647 * @thdev: output device that requests tracing be enabled
648 */
649 int intel_th_trace_enable(struct intel_th_device *thdev)
650 {
651 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
652 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
653
654 if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH))
655 return -EINVAL;
656
657 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
658 return -EINVAL;
659
660 hubdrv->enable(hub, &thdev->output);
661
662 return 0;
663 }
664 EXPORT_SYMBOL_GPL(intel_th_trace_enable);
665
666 /**
667 * intel_th_trace_disable() - disable tracing for an output device
668 * @thdev: output device that requests tracing be disabled
669 */
670 int intel_th_trace_disable(struct intel_th_device *thdev)
671 {
672 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
673 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
674
675 WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH);
676 if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
677 return -EINVAL;
678
679 hubdrv->disable(hub, &thdev->output);
680
681 return 0;
682 }
683 EXPORT_SYMBOL_GPL(intel_th_trace_disable);
684
685 int intel_th_set_output(struct intel_th_device *thdev,
686 unsigned int master)
687 {
688 struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
689 struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
690
691 if (!hubdrv->set_output)
692 return -ENOTSUPP;
693
694 return hubdrv->set_output(hub, master);
695 }
696 EXPORT_SYMBOL_GPL(intel_th_set_output);
697
698 static int __init intel_th_init(void)
699 {
700 intel_th_debug_init();
701
702 return bus_register(&intel_th_bus);
703 }
704 subsys_initcall(intel_th_init);
705
706 static void __exit intel_th_exit(void)
707 {
708 intel_th_debug_done();
709
710 bus_unregister(&intel_th_bus);
711 }
712 module_exit(intel_th_exit);
713
714 MODULE_LICENSE("GPL v2");
715 MODULE_DESCRIPTION("Intel(R) Trace Hub controller driver");
716 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
Linux with added FPC-III support