1/*
2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Dave Airlie
25 * Alex Deucher
26 * Jerome Glisse
27 */
28
29#include <linux/pci.h>
30#include <linux/pm_runtime.h>
31
32#include <drm/drm_device.h>
33#include <drm/drm_drv.h>
34#include <drm/drm_probe_helper.h>
35#include <drm/drm_vblank.h>
36#include <drm/radeon_drm.h>
37
38#include "atom.h"
39#include "radeon.h"
40#include "radeon_kms.h"
41#include "radeon_reg.h"
42
43
44#define RADEON_WAIT_IDLE_TIMEOUT 200
45
46/*
47 * radeon_driver_irq_handler_kms - irq handler for KMS
48 *
49 * This is the irq handler for the radeon KMS driver (all asics).
50 * radeon_irq_process is a macro that points to the per-asic
51 * irq handler callback.
52 */
53static irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
54{
55 struct drm_device *dev = (struct drm_device *) arg;
56 struct radeon_device *rdev = dev->dev_private;
57 irqreturn_t ret;
58
59 ret = radeon_irq_process(rdev);
60 if (ret == IRQ_HANDLED)
61 pm_runtime_mark_last_busy(dev: dev->dev);
62 return ret;
63}
64
65/*
66 * Handle hotplug events outside the interrupt handler proper.
67 */
68/**
69 * radeon_hotplug_work_func - display hotplug work handler
70 *
71 * @work: work struct
72 *
73 * This is the hot plug event work handler (all asics).
74 * The work gets scheduled from the irq handler if there
75 * was a hot plug interrupt. It walks the connector table
76 * and calls the hotplug handler for each one, then sends
77 * a drm hotplug event to alert userspace.
78 */
79static void radeon_hotplug_work_func(struct work_struct *work)
80{
81 struct radeon_device *rdev = container_of(work, struct radeon_device,
82 hotplug_work.work);
83 struct drm_device *dev = rdev_to_drm(rdev);
84 struct drm_mode_config *mode_config = &dev->mode_config;
85 struct drm_connector *connector;
86
87 /* we can race here at startup, some boards seem to trigger
88 * hotplug irqs when they shouldn't. */
89 if (!rdev->mode_info.mode_config_initialized)
90 return;
91
92 mutex_lock(&mode_config->mutex);
93 list_for_each_entry(connector, &mode_config->connector_list, head)
94 radeon_connector_hotplug(connector);
95 mutex_unlock(lock: &mode_config->mutex);
96 /* Just fire off a uevent and let userspace tell us what to do */
97 drm_helper_hpd_irq_event(dev);
98}
99
100static void radeon_dp_work_func(struct work_struct *work)
101{
102 struct radeon_device *rdev = container_of(work, struct radeon_device,
103 dp_work);
104 struct drm_device *dev = rdev_to_drm(rdev);
105 struct drm_mode_config *mode_config = &dev->mode_config;
106 struct drm_connector *connector;
107
108 mutex_lock(&mode_config->mutex);
109 list_for_each_entry(connector, &mode_config->connector_list, head)
110 radeon_connector_hotplug(connector);
111 mutex_unlock(lock: &mode_config->mutex);
112}
113
114/**
115 * radeon_driver_irq_preinstall_kms - drm irq preinstall callback
116 *
117 * @dev: drm dev pointer
118 *
119 * Gets the hw ready to enable irqs (all asics).
120 * This function disables all interrupt sources on the GPU.
121 */
122static void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
123{
124 struct radeon_device *rdev = dev->dev_private;
125 unsigned long irqflags;
126 unsigned i;
127
128 spin_lock_irqsave(&rdev->irq.lock, irqflags);
129 /* Disable *all* interrupts */
130 for (i = 0; i < RADEON_NUM_RINGS; i++)
131 atomic_set(v: &rdev->irq.ring_int[i], i: 0);
132 rdev->irq.dpm_thermal = false;
133 for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
134 rdev->irq.hpd[i] = false;
135 for (i = 0; i < RADEON_MAX_CRTCS; i++) {
136 rdev->irq.crtc_vblank_int[i] = false;
137 atomic_set(v: &rdev->irq.pflip[i], i: 0);
138 rdev->irq.afmt[i] = false;
139 }
140 radeon_irq_set(rdev);
141 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
142 /* Clear bits */
143 radeon_irq_process(rdev);
144}
145
146/**
147 * radeon_driver_irq_postinstall_kms - drm irq preinstall callback
148 *
149 * @dev: drm dev pointer
150 *
151 * Handles stuff to be done after enabling irqs (all asics).
152 * Returns 0 on success.
153 */
154static int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
155{
156 struct radeon_device *rdev = dev->dev_private;
157
158 if (ASIC_IS_AVIVO(rdev))
159 dev->max_vblank_count = 0x00ffffff;
160 else
161 dev->max_vblank_count = 0x001fffff;
162
163 return 0;
164}
165
166/**
167 * radeon_driver_irq_uninstall_kms - drm irq uninstall callback
168 *
169 * @dev: drm dev pointer
170 *
171 * This function disables all interrupt sources on the GPU (all asics).
172 */
173static void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
174{
175 struct radeon_device *rdev = dev->dev_private;
176 unsigned long irqflags;
177 unsigned i;
178
179 if (rdev == NULL) {
180 return;
181 }
182 spin_lock_irqsave(&rdev->irq.lock, irqflags);
183 /* Disable *all* interrupts */
184 for (i = 0; i < RADEON_NUM_RINGS; i++)
185 atomic_set(v: &rdev->irq.ring_int[i], i: 0);
186 rdev->irq.dpm_thermal = false;
187 for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
188 rdev->irq.hpd[i] = false;
189 for (i = 0; i < RADEON_MAX_CRTCS; i++) {
190 rdev->irq.crtc_vblank_int[i] = false;
191 atomic_set(v: &rdev->irq.pflip[i], i: 0);
192 rdev->irq.afmt[i] = false;
193 }
194 radeon_irq_set(rdev);
195 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
196}
197
198static int radeon_irq_install(struct radeon_device *rdev, int irq)
199{
200 struct drm_device *dev = rdev_to_drm(rdev);
201 int ret;
202
203 if (irq == IRQ_NOTCONNECTED)
204 return -ENOTCONN;
205
206 radeon_driver_irq_preinstall_kms(dev);
207
208 /* PCI devices require shared interrupts. */
209 ret = request_irq(irq, handler: radeon_driver_irq_handler_kms,
210 IRQF_SHARED, name: dev->driver->name, dev);
211 if (ret)
212 return ret;
213
214 radeon_driver_irq_postinstall_kms(dev);
215
216 return 0;
217}
218
219static void radeon_irq_uninstall(struct radeon_device *rdev)
220{
221 struct drm_device *dev = rdev_to_drm(rdev);
222 struct pci_dev *pdev = to_pci_dev(dev->dev);
223
224 radeon_driver_irq_uninstall_kms(dev);
225 free_irq(pdev->irq, dev);
226}
227
228/**
229 * radeon_msi_ok - asic specific msi checks
230 *
231 * @rdev: radeon device pointer
232 *
233 * Handles asic specific MSI checks to determine if
234 * MSIs should be enabled on a particular chip (all asics).
235 * Returns true if MSIs should be enabled, false if MSIs
236 * should not be enabled.
237 */
238static bool radeon_msi_ok(struct radeon_device *rdev)
239{
240 /* RV370/RV380 was first asic with MSI support */
241 if (rdev->family < CHIP_RV380)
242 return false;
243
244 /* MSIs don't work on AGP */
245 if (rdev->flags & RADEON_IS_AGP)
246 return false;
247
248 /*
249 * Older chips have a HW limitation, they can only generate 40 bits
250 * of address for "64-bit" MSIs which breaks on some platforms, notably
251 * IBM POWER servers, so we limit them
252 */
253 if (rdev->family < CHIP_BONAIRE) {
254 dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
255 rdev->pdev->no_64bit_msi = 1;
256 }
257
258 /* force MSI on */
259 if (radeon_msi == 1)
260 return true;
261 else if (radeon_msi == 0)
262 return false;
263
264 /* Quirks */
265 /* HP RS690 only seems to work with MSIs. */
266 if ((rdev->pdev->device == 0x791f) &&
267 (rdev->pdev->subsystem_vendor == 0x103c) &&
268 (rdev->pdev->subsystem_device == 0x30c2))
269 return true;
270
271 /* Dell RS690 only seems to work with MSIs. */
272 if ((rdev->pdev->device == 0x791f) &&
273 (rdev->pdev->subsystem_vendor == 0x1028) &&
274 (rdev->pdev->subsystem_device == 0x01fc))
275 return true;
276
277 /* Dell RS690 only seems to work with MSIs. */
278 if ((rdev->pdev->device == 0x791f) &&
279 (rdev->pdev->subsystem_vendor == 0x1028) &&
280 (rdev->pdev->subsystem_device == 0x01fd))
281 return true;
282
283 /* Gateway RS690 only seems to work with MSIs. */
284 if ((rdev->pdev->device == 0x791f) &&
285 (rdev->pdev->subsystem_vendor == 0x107b) &&
286 (rdev->pdev->subsystem_device == 0x0185))
287 return true;
288
289 /* try and enable MSIs by default on all RS690s */
290 if (rdev->family == CHIP_RS690)
291 return true;
292
293 /* RV515 seems to have MSI issues where it loses
294 * MSI rearms occasionally. This leads to lockups and freezes.
295 * disable it by default.
296 */
297 if (rdev->family == CHIP_RV515)
298 return false;
299 if (rdev->flags & RADEON_IS_IGP) {
300 /* APUs work fine with MSIs */
301 if (rdev->family >= CHIP_PALM)
302 return true;
303 /* lots of IGPs have problems with MSIs */
304 return false;
305 }
306
307 return true;
308}
309
310/**
311 * radeon_irq_kms_init - init driver interrupt info
312 *
313 * @rdev: radeon device pointer
314 *
315 * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
316 * Returns 0 for success, error for failure.
317 */
318int radeon_irq_kms_init(struct radeon_device *rdev)
319{
320 int r = 0;
321
322 spin_lock_init(&rdev->irq.lock);
323
324 /* Disable vblank irqs aggressively for power-saving */
325 rdev_to_drm(rdev)->vblank_disable_immediate = true;
326
327 r = drm_vblank_init(dev: rdev_to_drm(rdev), num_crtcs: rdev->num_crtc);
328 if (r) {
329 return r;
330 }
331
332 /* enable msi */
333 rdev->msi_enabled = 0;
334
335 if (radeon_msi_ok(rdev)) {
336 int ret = pci_enable_msi(dev: rdev->pdev);
337 if (!ret) {
338 rdev->msi_enabled = 1;
339 dev_info(rdev->dev, "radeon: using MSI.\n");
340 }
341 }
342
343 INIT_DELAYED_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
344 INIT_WORK(&rdev->dp_work, radeon_dp_work_func);
345 INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
346
347 rdev->irq.installed = true;
348 r = radeon_irq_install(rdev, irq: rdev->pdev->irq);
349 if (r) {
350 rdev->irq.installed = false;
351 flush_delayed_work(dwork: &rdev->hotplug_work);
352 return r;
353 }
354
355 DRM_INFO("radeon: irq initialized.\n");
356 return 0;
357}
358
359/**
360 * radeon_irq_kms_fini - tear down driver interrupt info
361 *
362 * @rdev: radeon device pointer
363 *
364 * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
365 */
366void radeon_irq_kms_fini(struct radeon_device *rdev)
367{
368 if (rdev->irq.installed) {
369 radeon_irq_uninstall(rdev);
370 rdev->irq.installed = false;
371 if (rdev->msi_enabled)
372 pci_disable_msi(dev: rdev->pdev);
373 flush_delayed_work(dwork: &rdev->hotplug_work);
374 }
375}
376
377/**
378 * radeon_irq_kms_sw_irq_get - enable software interrupt
379 *
380 * @rdev: radeon device pointer
381 * @ring: ring whose interrupt you want to enable
382 *
383 * Enables the software interrupt for a specific ring (all asics).
384 * The software interrupt is generally used to signal a fence on
385 * a particular ring.
386 */
387void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
388{
389 unsigned long irqflags;
390
391 if (!rdev->irq.installed)
392 return;
393
394 if (atomic_inc_return(v: &rdev->irq.ring_int[ring]) == 1) {
395 spin_lock_irqsave(&rdev->irq.lock, irqflags);
396 radeon_irq_set(rdev);
397 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
398 }
399}
400
401/**
402 * radeon_irq_kms_sw_irq_get_delayed - enable software interrupt
403 *
404 * @rdev: radeon device pointer
405 * @ring: ring whose interrupt you want to enable
406 *
407 * Enables the software interrupt for a specific ring (all asics).
408 * The software interrupt is generally used to signal a fence on
409 * a particular ring.
410 */
411bool radeon_irq_kms_sw_irq_get_delayed(struct radeon_device *rdev, int ring)
412{
413 return atomic_inc_return(v: &rdev->irq.ring_int[ring]) == 1;
414}
415
416/**
417 * radeon_irq_kms_sw_irq_put - disable software interrupt
418 *
419 * @rdev: radeon device pointer
420 * @ring: ring whose interrupt you want to disable
421 *
422 * Disables the software interrupt for a specific ring (all asics).
423 * The software interrupt is generally used to signal a fence on
424 * a particular ring.
425 */
426void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
427{
428 unsigned long irqflags;
429
430 if (!rdev->irq.installed)
431 return;
432
433 if (atomic_dec_and_test(v: &rdev->irq.ring_int[ring])) {
434 spin_lock_irqsave(&rdev->irq.lock, irqflags);
435 radeon_irq_set(rdev);
436 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
437 }
438}
439
440/**
441 * radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
442 *
443 * @rdev: radeon device pointer
444 * @crtc: crtc whose interrupt you want to enable
445 *
446 * Enables the pageflip interrupt for a specific crtc (all asics).
447 * For pageflips we use the vblank interrupt source.
448 */
449void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
450{
451 unsigned long irqflags;
452
453 if (crtc < 0 || crtc >= rdev->num_crtc)
454 return;
455
456 if (!rdev->irq.installed)
457 return;
458
459 if (atomic_inc_return(v: &rdev->irq.pflip[crtc]) == 1) {
460 spin_lock_irqsave(&rdev->irq.lock, irqflags);
461 radeon_irq_set(rdev);
462 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
463 }
464}
465
466/**
467 * radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
468 *
469 * @rdev: radeon device pointer
470 * @crtc: crtc whose interrupt you want to disable
471 *
472 * Disables the pageflip interrupt for a specific crtc (all asics).
473 * For pageflips we use the vblank interrupt source.
474 */
475void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
476{
477 unsigned long irqflags;
478
479 if (crtc < 0 || crtc >= rdev->num_crtc)
480 return;
481
482 if (!rdev->irq.installed)
483 return;
484
485 if (atomic_dec_and_test(v: &rdev->irq.pflip[crtc])) {
486 spin_lock_irqsave(&rdev->irq.lock, irqflags);
487 radeon_irq_set(rdev);
488 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
489 }
490}
491
492/**
493 * radeon_irq_kms_enable_afmt - enable audio format change interrupt
494 *
495 * @rdev: radeon device pointer
496 * @block: afmt block whose interrupt you want to enable
497 *
498 * Enables the afmt change interrupt for a specific afmt block (all asics).
499 */
500void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
501{
502 unsigned long irqflags;
503
504 if (!rdev->irq.installed)
505 return;
506
507 spin_lock_irqsave(&rdev->irq.lock, irqflags);
508 rdev->irq.afmt[block] = true;
509 radeon_irq_set(rdev);
510 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
511
512}
513
514/**
515 * radeon_irq_kms_disable_afmt - disable audio format change interrupt
516 *
517 * @rdev: radeon device pointer
518 * @block: afmt block whose interrupt you want to disable
519 *
520 * Disables the afmt change interrupt for a specific afmt block (all asics).
521 */
522void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
523{
524 unsigned long irqflags;
525
526 if (!rdev->irq.installed)
527 return;
528
529 spin_lock_irqsave(&rdev->irq.lock, irqflags);
530 rdev->irq.afmt[block] = false;
531 radeon_irq_set(rdev);
532 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
533}
534
535/**
536 * radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
537 *
538 * @rdev: radeon device pointer
539 * @hpd_mask: mask of hpd pins you want to enable.
540 *
541 * Enables the hotplug detect interrupt for a specific hpd pin (all asics).
542 */
543void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
544{
545 unsigned long irqflags;
546 int i;
547
548 if (!rdev->irq.installed)
549 return;
550
551 spin_lock_irqsave(&rdev->irq.lock, irqflags);
552 for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
553 rdev->irq.hpd[i] |= !!(hpd_mask & (1 << i));
554 radeon_irq_set(rdev);
555 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
556}
557
558/**
559 * radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
560 *
561 * @rdev: radeon device pointer
562 * @hpd_mask: mask of hpd pins you want to disable.
563 *
564 * Disables the hotplug detect interrupt for a specific hpd pin (all asics).
565 */
566void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
567{
568 unsigned long irqflags;
569 int i;
570
571 if (!rdev->irq.installed)
572 return;
573
574 spin_lock_irqsave(&rdev->irq.lock, irqflags);
575 for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
576 rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
577 radeon_irq_set(rdev);
578 spin_unlock_irqrestore(lock: &rdev->irq.lock, flags: irqflags);
579}
580
581/**
582 * radeon_irq_kms_set_irq_n_enabled - helper for updating interrupt enable registers
583 *
584 * @rdev: radeon device pointer
585 * @reg: the register to write to enable/disable interrupts
586 * @mask: the mask that enables the interrupts
587 * @enable: whether to enable or disable the interrupt register
588 * @name: the name of the interrupt register to print to the kernel log
589 * @n: the number of the interrupt register to print to the kernel log
590 *
591 * Helper for updating the enable state of interrupt registers. Checks whether
592 * or not the interrupt matches the enable state we want. If it doesn't, then
593 * we update it and print a debugging message to the kernel log indicating the
594 * new state of the interrupt register.
595 *
596 * Used for updating sequences of interrupts registers like HPD1, HPD2, etc.
597 */
598void radeon_irq_kms_set_irq_n_enabled(struct radeon_device *rdev,
599 u32 reg, u32 mask,
600 bool enable, const char *name, unsigned n)
601{
602 u32 tmp = RREG32(reg);
603
604 /* Interrupt state didn't change */
605 if (!!(tmp & mask) == enable)
606 return;
607
608 if (enable) {
609 DRM_DEBUG("%s%d interrupts enabled\n", name, n);
610 WREG32(reg, tmp |= mask);
611 } else {
612 DRM_DEBUG("%s%d interrupts disabled\n", name, n);
613 WREG32(reg, tmp & ~mask);
614 }
615}
616

source code of linux/drivers/gpu/drm/radeon/radeon_irq_kms.c