1 /* $NetBSD: radeon_irq_kms.c,v 1.6 2021/12/18 23:45:43 riastradh Exp $ */
2
3 /*
4 * Copyright 2008 Advanced Micro Devices, Inc.
5 * Copyright 2008 Red Hat Inc.
6 * Copyright 2009 Jerome Glisse.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * Authors: Dave Airlie
27 * Alex Deucher
28 * Jerome Glisse
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: radeon_irq_kms.c,v 1.6 2021/12/18 23:45:43 riastradh Exp $");
33
34 #include <linux/pci.h>
35 #include <linux/pm_runtime.h>
36
37 #include <drm/drm_crtc_helper.h>
38 #include <drm/drm_device.h>
39 #include <drm/drm_irq.h>
40 #include <drm/drm_probe_helper.h>
41 #include <drm/drm_vblank.h>
42 #include <drm/radeon_drm.h>
43
44 #include "atom.h"
45 #include "radeon.h"
46 #include "radeon_reg.h"
47
48
49 #define RADEON_WAIT_IDLE_TIMEOUT 200
50
51 /**
52 * radeon_driver_irq_handler_kms - irq handler for KMS
53 *
54 * @int irq, void *arg: args
55 *
56 * This is the irq handler for the radeon KMS driver (all asics).
57 * radeon_irq_process is a macro that points to the per-asic
58 * irq handler callback.
59 */
radeon_driver_irq_handler_kms(DRM_IRQ_ARGS)60 irqreturn_t radeon_driver_irq_handler_kms(DRM_IRQ_ARGS)
61 {
62 struct drm_device *dev = (struct drm_device *) arg;
63 struct radeon_device *rdev = dev->dev_private;
64 irqreturn_t ret;
65
66 ret = radeon_irq_process(rdev);
67 if (ret == IRQ_HANDLED)
68 pm_runtime_mark_last_busy(dev->dev);
69 return ret;
70 }
71
72 /*
73 * Handle hotplug events outside the interrupt handler proper.
74 */
75 /**
76 * radeon_hotplug_work_func - display hotplug work handler
77 *
78 * @work: work struct
79 *
80 * This is the hot plug event work handler (all asics).
81 * The work gets scheduled from the irq handler if there
82 * was a hot plug interrupt. It walks the connector table
83 * and calls the hotplug handler for each one, then sends
84 * a drm hotplug event to alert userspace.
85 */
radeon_hotplug_work_func(struct work_struct * work)86 static void radeon_hotplug_work_func(struct work_struct *work)
87 {
88 struct radeon_device *rdev = container_of(work, struct radeon_device,
89 hotplug_work.work);
90 struct drm_device *dev = rdev->ddev;
91 struct drm_mode_config *mode_config = &dev->mode_config;
92 struct drm_connector *connector;
93
94 /* we can race here at startup, some boards seem to trigger
95 * hotplug irqs when they shouldn't. */
96 if (!rdev->mode_info.mode_config_initialized)
97 return;
98
99 mutex_lock(&mode_config->mutex);
100 list_for_each_entry(connector, &mode_config->connector_list, head)
101 radeon_connector_hotplug(connector);
102 mutex_unlock(&mode_config->mutex);
103 /* Just fire off a uevent and let userspace tell us what to do */
104 drm_helper_hpd_irq_event(dev);
105 }
106
radeon_dp_work_func(struct work_struct * work)107 static void radeon_dp_work_func(struct work_struct *work)
108 {
109 struct radeon_device *rdev = container_of(work, struct radeon_device,
110 dp_work);
111 struct drm_device *dev = rdev->ddev;
112 struct drm_mode_config *mode_config = &dev->mode_config;
113 struct drm_connector *connector;
114
115 /* this should take a mutex */
116 list_for_each_entry(connector, &mode_config->connector_list, head)
117 radeon_connector_hotplug(connector);
118 }
119 /**
120 * radeon_driver_irq_preinstall_kms - drm irq preinstall callback
121 *
122 * @dev: drm dev pointer
123 *
124 * Gets the hw ready to enable irqs (all asics).
125 * This function disables all interrupt sources on the GPU.
126 */
radeon_driver_irq_preinstall_kms(struct drm_device * dev)127 void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
128 {
129 struct radeon_device *rdev = dev->dev_private;
130 unsigned long irqflags;
131 unsigned i;
132
133 spin_lock_irqsave(&rdev->irq.lock, irqflags);
134 /* Disable *all* interrupts */
135 for (i = 0; i < RADEON_NUM_RINGS; i++)
136 atomic_set(&rdev->irq.ring_int[i], 0);
137 rdev->irq.dpm_thermal = false;
138 for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
139 rdev->irq.hpd[i] = false;
140 for (i = 0; i < RADEON_MAX_CRTCS; i++) {
141 rdev->irq.crtc_vblank_int[i] = false;
142 atomic_set(&rdev->irq.pflip[i], 0);
143 rdev->irq.afmt[i] = false;
144 }
145 radeon_irq_set(rdev);
146 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
147 /* Clear bits */
148 radeon_irq_process(rdev);
149 }
150
151 /**
152 * radeon_driver_irq_postinstall_kms - drm irq preinstall callback
153 *
154 * @dev: drm dev pointer
155 *
156 * Handles stuff to be done after enabling irqs (all asics).
157 * Returns 0 on success.
158 */
radeon_driver_irq_postinstall_kms(struct drm_device * dev)159 int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
160 {
161 struct radeon_device *rdev = dev->dev_private;
162
163 if (ASIC_IS_AVIVO(rdev))
164 dev->max_vblank_count = 0x00ffffff;
165 else
166 dev->max_vblank_count = 0x001fffff;
167
168 return 0;
169 }
170
171 /**
172 * radeon_driver_irq_uninstall_kms - drm irq uninstall callback
173 *
174 * @dev: drm dev pointer
175 *
176 * This function disables all interrupt sources on the GPU (all asics).
177 */
radeon_driver_irq_uninstall_kms(struct drm_device * dev)178 void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
179 {
180 struct radeon_device *rdev = dev->dev_private;
181 unsigned long irqflags;
182 unsigned i;
183
184 if (rdev == NULL) {
185 return;
186 }
187 spin_lock_irqsave(&rdev->irq.lock, irqflags);
188 /* Disable *all* interrupts */
189 for (i = 0; i < RADEON_NUM_RINGS; i++)
190 atomic_set(&rdev->irq.ring_int[i], 0);
191 rdev->irq.dpm_thermal = false;
192 for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
193 rdev->irq.hpd[i] = false;
194 for (i = 0; i < RADEON_MAX_CRTCS; i++) {
195 rdev->irq.crtc_vblank_int[i] = false;
196 atomic_set(&rdev->irq.pflip[i], 0);
197 rdev->irq.afmt[i] = false;
198 }
199 radeon_irq_set(rdev);
200 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
201 }
202
203 /**
204 * radeon_msi_ok - asic specific msi checks
205 *
206 * @rdev: radeon device pointer
207 *
208 * Handles asic specific MSI checks to determine if
209 * MSIs should be enabled on a particular chip (all asics).
210 * Returns true if MSIs should be enabled, false if MSIs
211 * should not be enabled.
212 */
radeon_msi_ok(struct radeon_device * rdev)213 static bool radeon_msi_ok(struct radeon_device *rdev)
214 {
215 /* RV370/RV380 was first asic with MSI support */
216 if (rdev->family < CHIP_RV380)
217 return false;
218
219 /* MSIs don't work on AGP */
220 if (rdev->flags & RADEON_IS_AGP)
221 return false;
222
223 /*
224 * Older chips have a HW limitation, they can only generate 40 bits
225 * of address for "64-bit" MSIs which breaks on some platforms, notably
226 * IBM POWER servers, so we limit them
227 */
228 if (rdev->family < CHIP_BONAIRE) {
229 dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
230 rdev->pdev->no_64bit_msi = 1;
231 }
232
233 /* force MSI on */
234 if (radeon_msi == 1)
235 return true;
236 else if (radeon_msi == 0)
237 return false;
238
239 /* Quirks */
240 /* HP RS690 only seems to work with MSIs. */
241 if ((rdev->pdev->device == 0x791f) &&
242 (rdev->pdev->subsystem_vendor == 0x103c) &&
243 (rdev->pdev->subsystem_device == 0x30c2))
244 return true;
245
246 /* Dell RS690 only seems to work with MSIs. */
247 if ((rdev->pdev->device == 0x791f) &&
248 (rdev->pdev->subsystem_vendor == 0x1028) &&
249 (rdev->pdev->subsystem_device == 0x01fc))
250 return true;
251
252 /* Dell RS690 only seems to work with MSIs. */
253 if ((rdev->pdev->device == 0x791f) &&
254 (rdev->pdev->subsystem_vendor == 0x1028) &&
255 (rdev->pdev->subsystem_device == 0x01fd))
256 return true;
257
258 /* Gateway RS690 only seems to work with MSIs. */
259 if ((rdev->pdev->device == 0x791f) &&
260 (rdev->pdev->subsystem_vendor == 0x107b) &&
261 (rdev->pdev->subsystem_device == 0x0185))
262 return true;
263
264 /* try and enable MSIs by default on all RS690s */
265 if (rdev->family == CHIP_RS690)
266 return true;
267
268 /* RV515 seems to have MSI issues where it loses
269 * MSI rearms occasionally. This leads to lockups and freezes.
270 * disable it by default.
271 */
272 if (rdev->family == CHIP_RV515)
273 return false;
274 if (rdev->flags & RADEON_IS_IGP) {
275 /* APUs work fine with MSIs */
276 if (rdev->family >= CHIP_PALM)
277 return true;
278 /* lots of IGPs have problems with MSIs */
279 return false;
280 }
281
282 return true;
283 }
284
285 /**
286 * radeon_irq_kms_init - init driver interrupt info
287 *
288 * @rdev: radeon device pointer
289 *
290 * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
291 * Returns 0 for success, error for failure.
292 */
radeon_irq_kms_init(struct radeon_device * rdev)293 int radeon_irq_kms_init(struct radeon_device *rdev)
294 {
295 int r = 0;
296
297 spin_lock_init(&rdev->irq.lock);
298
299 /* Disable vblank irqs aggressively for power-saving */
300 rdev->ddev->vblank_disable_immediate = true;
301
302 r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
303 if (r) {
304 return r;
305 }
306
307 /* enable msi */
308 rdev->msi_enabled = 0;
309
310 if (radeon_msi_ok(rdev)) {
311 int ret = pci_enable_msi(rdev->pdev);
312 if (!ret) {
313 rdev->msi_enabled = 1;
314 dev_info(rdev->dev, "radeon: using MSI.\n");
315 }
316 }
317
318 INIT_DELAYED_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
319 INIT_WORK(&rdev->dp_work, radeon_dp_work_func);
320 INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
321
322 rdev->irq.installed = true;
323 #ifdef __NetBSD__
324 r = drm_irq_install(rdev->ddev);
325 #else
326 r = drm_irq_install(rdev->ddev, rdev->ddev->pdev->irq);
327 #endif
328 if (r) {
329 rdev->irq.installed = false;
330 flush_delayed_work(&rdev->hotplug_work);
331 return r;
332 }
333
334 DRM_INFO("radeon: irq initialized.\n");
335 return 0;
336 }
337
338 /**
339 * radeon_irq_kms_fini - tear down driver interrupt info
340 *
341 * @rdev: radeon device pointer
342 *
343 * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
344 */
radeon_irq_kms_fini(struct radeon_device * rdev)345 void radeon_irq_kms_fini(struct radeon_device *rdev)
346 {
347 if (rdev->irq.installed) {
348 drm_irq_uninstall(rdev->ddev);
349 rdev->irq.installed = false;
350 if (rdev->msi_enabled)
351 pci_disable_msi(rdev->pdev);
352 flush_delayed_work(&rdev->hotplug_work);
353 }
354 }
355
356 /**
357 * radeon_irq_kms_sw_irq_get - enable software interrupt
358 *
359 * @rdev: radeon device pointer
360 * @ring: ring whose interrupt you want to enable
361 *
362 * Enables the software interrupt for a specific ring (all asics).
363 * The software interrupt is generally used to signal a fence on
364 * a particular ring.
365 */
radeon_irq_kms_sw_irq_get(struct radeon_device * rdev,int ring)366 void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
367 {
368 unsigned long irqflags;
369
370 if (!rdev->ddev->irq_enabled)
371 return;
372
373 if (atomic_inc_return(&rdev->irq.ring_int[ring]) == 1) {
374 spin_lock_irqsave(&rdev->irq.lock, irqflags);
375 radeon_irq_set(rdev);
376 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
377 }
378 }
379
380 /**
381 * radeon_irq_kms_sw_irq_get_delayed - enable software interrupt
382 *
383 * @rdev: radeon device pointer
384 * @ring: ring whose interrupt you want to enable
385 *
386 * Enables the software interrupt for a specific ring (all asics).
387 * The software interrupt is generally used to signal a fence on
388 * a particular ring.
389 */
radeon_irq_kms_sw_irq_get_delayed(struct radeon_device * rdev,int ring)390 bool radeon_irq_kms_sw_irq_get_delayed(struct radeon_device *rdev, int ring)
391 {
392 return atomic_inc_return(&rdev->irq.ring_int[ring]) == 1;
393 }
394
395 /**
396 * radeon_irq_kms_sw_irq_put - disable software interrupt
397 *
398 * @rdev: radeon device pointer
399 * @ring: ring whose interrupt you want to disable
400 *
401 * Disables the software interrupt for a specific ring (all asics).
402 * The software interrupt is generally used to signal a fence on
403 * a particular ring.
404 */
radeon_irq_kms_sw_irq_put(struct radeon_device * rdev,int ring)405 void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
406 {
407 unsigned long irqflags;
408
409 if (!rdev->ddev->irq_enabled)
410 return;
411
412 if (atomic_dec_and_test(&rdev->irq.ring_int[ring])) {
413 spin_lock_irqsave(&rdev->irq.lock, irqflags);
414 radeon_irq_set(rdev);
415 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
416 }
417 }
418
419 /**
420 * radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
421 *
422 * @rdev: radeon device pointer
423 * @crtc: crtc whose interrupt you want to enable
424 *
425 * Enables the pageflip interrupt for a specific crtc (all asics).
426 * For pageflips we use the vblank interrupt source.
427 */
radeon_irq_kms_pflip_irq_get(struct radeon_device * rdev,int crtc)428 void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
429 {
430 unsigned long irqflags;
431
432 if (crtc < 0 || crtc >= rdev->num_crtc)
433 return;
434
435 if (!rdev->ddev->irq_enabled)
436 return;
437
438 if (atomic_inc_return(&rdev->irq.pflip[crtc]) == 1) {
439 spin_lock_irqsave(&rdev->irq.lock, irqflags);
440 radeon_irq_set(rdev);
441 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
442 }
443 }
444
445 /**
446 * radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
447 *
448 * @rdev: radeon device pointer
449 * @crtc: crtc whose interrupt you want to disable
450 *
451 * Disables the pageflip interrupt for a specific crtc (all asics).
452 * For pageflips we use the vblank interrupt source.
453 */
radeon_irq_kms_pflip_irq_put(struct radeon_device * rdev,int crtc)454 void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
455 {
456 unsigned long irqflags;
457
458 if (crtc < 0 || crtc >= rdev->num_crtc)
459 return;
460
461 if (!rdev->ddev->irq_enabled)
462 return;
463
464 if (atomic_dec_and_test(&rdev->irq.pflip[crtc])) {
465 spin_lock_irqsave(&rdev->irq.lock, irqflags);
466 radeon_irq_set(rdev);
467 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
468 }
469 }
470
471 /**
472 * radeon_irq_kms_enable_afmt - enable audio format change interrupt
473 *
474 * @rdev: radeon device pointer
475 * @block: afmt block whose interrupt you want to enable
476 *
477 * Enables the afmt change interrupt for a specific afmt block (all asics).
478 */
radeon_irq_kms_enable_afmt(struct radeon_device * rdev,int block)479 void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
480 {
481 unsigned long irqflags;
482
483 if (!rdev->ddev->irq_enabled)
484 return;
485
486 spin_lock_irqsave(&rdev->irq.lock, irqflags);
487 rdev->irq.afmt[block] = true;
488 radeon_irq_set(rdev);
489 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
490
491 }
492
493 /**
494 * radeon_irq_kms_disable_afmt - disable audio format change interrupt
495 *
496 * @rdev: radeon device pointer
497 * @block: afmt block whose interrupt you want to disable
498 *
499 * Disables the afmt change interrupt for a specific afmt block (all asics).
500 */
radeon_irq_kms_disable_afmt(struct radeon_device * rdev,int block)501 void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
502 {
503 unsigned long irqflags;
504
505 if (!rdev->ddev->irq_enabled)
506 return;
507
508 spin_lock_irqsave(&rdev->irq.lock, irqflags);
509 rdev->irq.afmt[block] = false;
510 radeon_irq_set(rdev);
511 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
512 }
513
514 /**
515 * radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
516 *
517 * @rdev: radeon device pointer
518 * @hpd_mask: mask of hpd pins you want to enable.
519 *
520 * Enables the hotplug detect interrupt for a specific hpd pin (all asics).
521 */
radeon_irq_kms_enable_hpd(struct radeon_device * rdev,unsigned hpd_mask)522 void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
523 {
524 unsigned long irqflags;
525 int i;
526
527 if (!rdev->ddev->irq_enabled)
528 return;
529
530 spin_lock_irqsave(&rdev->irq.lock, irqflags);
531 for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
532 rdev->irq.hpd[i] |= !!(hpd_mask & (1 << i));
533 radeon_irq_set(rdev);
534 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
535 }
536
537 /**
538 * radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
539 *
540 * @rdev: radeon device pointer
541 * @hpd_mask: mask of hpd pins you want to disable.
542 *
543 * Disables the hotplug detect interrupt for a specific hpd pin (all asics).
544 */
radeon_irq_kms_disable_hpd(struct radeon_device * rdev,unsigned hpd_mask)545 void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
546 {
547 unsigned long irqflags;
548 int i;
549
550 if (!rdev->ddev->irq_enabled)
551 return;
552
553 spin_lock_irqsave(&rdev->irq.lock, irqflags);
554 for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
555 rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
556 radeon_irq_set(rdev);
557 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
558 }
559
560 /**
561 * radeon_irq_kms_update_int_n - helper for updating interrupt enable registers
562 *
563 * @rdev: radeon device pointer
564 * @reg: the register to write to enable/disable interrupts
565 * @mask: the mask that enables the interrupts
566 * @enable: whether to enable or disable the interrupt register
567 * @name: the name of the interrupt register to print to the kernel log
568 * @num: the number of the interrupt register to print to the kernel log
569 *
570 * Helper for updating the enable state of interrupt registers. Checks whether
571 * or not the interrupt matches the enable state we want. If it doesn't, then
572 * we update it and print a debugging message to the kernel log indicating the
573 * new state of the interrupt register.
574 *
575 * Used for updating sequences of interrupts registers like HPD1, HPD2, etc.
576 */
radeon_irq_kms_set_irq_n_enabled(struct radeon_device * rdev,u32 reg,u32 mask,bool enable,const char * name,unsigned n)577 void radeon_irq_kms_set_irq_n_enabled(struct radeon_device *rdev,
578 u32 reg, u32 mask,
579 bool enable, const char *name, unsigned n)
580 {
581 u32 tmp = RREG32(reg);
582
583 /* Interrupt state didn't change */
584 if (!!(tmp & mask) == enable)
585 return;
586
587 if (enable) {
588 DRM_DEBUG("%s%d interrupts enabled\n", name, n);
589 WREG32(reg, tmp |= mask);
590 } else {
591 DRM_DEBUG("%s%d interrupts disabled\n", name, n);
592 WREG32(reg, tmp & ~mask);
593 }
594 }
595