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 #include <drm/drmP.h>
29 #include <drm/drm_crtc_helper.h>
30 #include <drm/radeon_drm.h>
31 #include "radeon_reg.h"
32 #include "radeon.h"
33 #include "atom.h"
34 
35 #include <linux/pm_runtime.h>
36 
37 #define RADEON_WAIT_IDLE_TIMEOUT 200
38 
39 /**
40  * radeon_driver_irq_handler_kms - irq handler for KMS
41  *
42  * @int irq, void *arg: args
43  *
44  * This is the irq handler for the radeon KMS driver (all asics).
45  * radeon_irq_process is a macro that points to the per-asic
46  * irq handler callback.
47  */
48 irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
49 {
50 	struct drm_device *dev = (struct drm_device *) arg;
51 	struct radeon_device *rdev = dev->dev_private;
52 	irqreturn_t ret;
53 
54 	ret = radeon_irq_process(rdev);
55 	if (ret == IRQ_HANDLED)
56 		pm_runtime_mark_last_busy(dev->dev);
57 	return ret;
58 }
59 
60 /*
61  * Handle hotplug events outside the interrupt handler proper.
62  */
63 /**
64  * radeon_hotplug_work_func - display hotplug work handler
65  *
66  * @work: work struct
67  *
68  * This is the hot plug event work handler (all asics).
69  * The work gets scheduled from the irq handler if there
70  * was a hot plug interrupt.  It walks the connector table
71  * and calls the hotplug handler for each one, then sends
72  * a drm hotplug event to alert userspace.
73  */
74 static void radeon_hotplug_work_func(struct work_struct *work)
75 {
76 	struct radeon_device *rdev = container_of(work, struct radeon_device,
77 						  hotplug_work);
78 	struct drm_device *dev = rdev->ddev;
79 	struct drm_mode_config *mode_config = &dev->mode_config;
80 	struct drm_connector *connector;
81 
82 	if (mode_config->num_connector) {
83 		list_for_each_entry(connector, &mode_config->connector_list, head)
84 			radeon_connector_hotplug(connector);
85 	}
86 	/* Just fire off a uevent and let userspace tell us what to do */
87 	drm_helper_hpd_irq_event(dev);
88 }
89 
90 /**
91  * radeon_irq_reset_work_func - execute gpu reset
92  *
93  * @work: work struct
94  *
95  * Execute scheduled gpu reset (cayman+).
96  * This function is called when the irq handler
97  * thinks we need a gpu reset.
98  */
99 static void radeon_irq_reset_work_func(struct work_struct *work)
100 {
101 	struct radeon_device *rdev = container_of(work, struct radeon_device,
102 						  reset_work);
103 
104 	radeon_gpu_reset(rdev);
105 }
106 
107 /**
108  * radeon_driver_irq_preinstall_kms - drm irq preinstall callback
109  *
110  * @dev: drm dev pointer
111  *
112  * Gets the hw ready to enable irqs (all asics).
113  * This function disables all interrupt sources on the GPU.
114  */
115 void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
116 {
117 	struct radeon_device *rdev = dev->dev_private;
118 	unsigned long irqflags;
119 	unsigned i;
120 
121 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
122 	/* Disable *all* interrupts */
123 	for (i = 0; i < RADEON_NUM_RINGS; i++)
124 		atomic_set(&rdev->irq.ring_int[i], 0);
125 	rdev->irq.dpm_thermal = false;
126 	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
127 		rdev->irq.hpd[i] = false;
128 	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
129 		rdev->irq.crtc_vblank_int[i] = false;
130 		atomic_set(&rdev->irq.pflip[i], 0);
131 		rdev->irq.afmt[i] = false;
132 	}
133 	radeon_irq_set(rdev);
134 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
135 	/* Clear bits */
136 	radeon_irq_process(rdev);
137 }
138 
139 /**
140  * radeon_driver_irq_postinstall_kms - drm irq preinstall callback
141  *
142  * @dev: drm dev pointer
143  *
144  * Handles stuff to be done after enabling irqs (all asics).
145  * Returns 0 on success.
146  */
147 int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
148 {
149 	dev->max_vblank_count = 0x001fffff;
150 	return 0;
151 }
152 
153 /**
154  * radeon_driver_irq_uninstall_kms - drm irq uninstall callback
155  *
156  * @dev: drm dev pointer
157  *
158  * This function disables all interrupt sources on the GPU (all asics).
159  */
160 void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
161 {
162 	struct radeon_device *rdev = dev->dev_private;
163 	unsigned long irqflags;
164 	unsigned i;
165 
166 	if (rdev == NULL) {
167 		return;
168 	}
169 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
170 	/* Disable *all* interrupts */
171 	for (i = 0; i < RADEON_NUM_RINGS; i++)
172 		atomic_set(&rdev->irq.ring_int[i], 0);
173 	rdev->irq.dpm_thermal = false;
174 	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
175 		rdev->irq.hpd[i] = false;
176 	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
177 		rdev->irq.crtc_vblank_int[i] = false;
178 		atomic_set(&rdev->irq.pflip[i], 0);
179 		rdev->irq.afmt[i] = false;
180 	}
181 	radeon_irq_set(rdev);
182 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
183 }
184 
185 /**
186  * radeon_msi_ok - asic specific msi checks
187  *
188  * @rdev: radeon device pointer
189  *
190  * Handles asic specific MSI checks to determine if
191  * MSIs should be enabled on a particular chip (all asics).
192  * Returns true if MSIs should be enabled, false if MSIs
193  * should not be enabled.
194  */
195 static bool radeon_msi_ok(struct radeon_device *rdev)
196 {
197 	/* RV370/RV380 was first asic with MSI support */
198 	if (rdev->family < CHIP_RV380)
199 		return false;
200 
201 	/* MSIs don't work on AGP */
202 	if (rdev->flags & RADEON_IS_AGP)
203 		return false;
204 
205 	/* force MSI on */
206 	if (radeon_msi == 1)
207 		return true;
208 	else if (radeon_msi == 0)
209 		return false;
210 
211 	/* Quirks */
212 	/* HP RS690 only seems to work with MSIs. */
213 	if ((rdev->pdev->device == 0x791f) &&
214 	    (rdev->pdev->subsystem_vendor == 0x103c) &&
215 	    (rdev->pdev->subsystem_device == 0x30c2))
216 		return true;
217 
218 	/* Dell RS690 only seems to work with MSIs. */
219 	if ((rdev->pdev->device == 0x791f) &&
220 	    (rdev->pdev->subsystem_vendor == 0x1028) &&
221 	    (rdev->pdev->subsystem_device == 0x01fc))
222 		return true;
223 
224 	/* Dell RS690 only seems to work with MSIs. */
225 	if ((rdev->pdev->device == 0x791f) &&
226 	    (rdev->pdev->subsystem_vendor == 0x1028) &&
227 	    (rdev->pdev->subsystem_device == 0x01fd))
228 		return true;
229 
230 	/* Gateway RS690 only seems to work with MSIs. */
231 	if ((rdev->pdev->device == 0x791f) &&
232 	    (rdev->pdev->subsystem_vendor == 0x107b) &&
233 	    (rdev->pdev->subsystem_device == 0x0185))
234 		return true;
235 
236 	/* try and enable MSIs by default on all RS690s */
237 	if (rdev->family == CHIP_RS690)
238 		return true;
239 
240 	/* RV515 seems to have MSI issues where it loses
241 	 * MSI rearms occasionally. This leads to lockups and freezes.
242 	 * disable it by default.
243 	 */
244 	if (rdev->family == CHIP_RV515)
245 		return false;
246 	if (rdev->flags & RADEON_IS_IGP) {
247 		/* APUs work fine with MSIs */
248 		if (rdev->family >= CHIP_PALM)
249 			return true;
250 		/* lots of IGPs have problems with MSIs */
251 		return false;
252 	}
253 
254 	return true;
255 }
256 
257 /**
258  * radeon_irq_kms_init - init driver interrupt info
259  *
260  * @rdev: radeon device pointer
261  *
262  * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
263  * Returns 0 for success, error for failure.
264  */
265 int radeon_irq_kms_init(struct radeon_device *rdev)
266 {
267 	int r = 0;
268 
269 	spin_lock_init(&rdev->irq.lock);
270 	r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
271 	if (r) {
272 		return r;
273 	}
274 	/* enable msi */
275 	rdev->msi_enabled = 0;
276 
277 	if (radeon_msi_ok(rdev)) {
278 		int ret = pci_enable_msi(rdev->pdev);
279 		if (!ret) {
280 			rdev->msi_enabled = 1;
281 			dev_info(rdev->dev, "radeon: using MSI.\n");
282 		}
283 	}
284 
285 	INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
286 	INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
287 	INIT_WORK(&rdev->reset_work, radeon_irq_reset_work_func);
288 
289 	rdev->irq.installed = true;
290 	r = drm_irq_install(rdev->ddev);
291 	if (r) {
292 		rdev->irq.installed = false;
293 		flush_work(&rdev->hotplug_work);
294 		return r;
295 	}
296 
297 	DRM_INFO("radeon: irq initialized.\n");
298 	return 0;
299 }
300 
301 /**
302  * radeon_irq_kms_fini - tear down driver interrupt info
303  *
304  * @rdev: radeon device pointer
305  *
306  * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
307  */
308 void radeon_irq_kms_fini(struct radeon_device *rdev)
309 {
310 	drm_vblank_cleanup(rdev->ddev);
311 	if (rdev->irq.installed) {
312 		drm_irq_uninstall(rdev->ddev);
313 		rdev->irq.installed = false;
314 		if (rdev->msi_enabled)
315 			pci_disable_msi(rdev->pdev);
316 		flush_work(&rdev->hotplug_work);
317 	}
318 }
319 
320 /**
321  * radeon_irq_kms_sw_irq_get - enable software interrupt
322  *
323  * @rdev: radeon device pointer
324  * @ring: ring whose interrupt you want to enable
325  *
326  * Enables the software interrupt for a specific ring (all asics).
327  * The software interrupt is generally used to signal a fence on
328  * a particular ring.
329  */
330 void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
331 {
332 	unsigned long irqflags;
333 
334 	if (!rdev->ddev->irq_enabled)
335 		return;
336 
337 	if (atomic_inc_return(&rdev->irq.ring_int[ring]) == 1) {
338 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
339 		radeon_irq_set(rdev);
340 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
341 	}
342 }
343 
344 /**
345  * radeon_irq_kms_sw_irq_put - disable software interrupt
346  *
347  * @rdev: radeon device pointer
348  * @ring: ring whose interrupt you want to disable
349  *
350  * Disables the software interrupt for a specific ring (all asics).
351  * The software interrupt is generally used to signal a fence on
352  * a particular ring.
353  */
354 void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
355 {
356 	unsigned long irqflags;
357 
358 	if (!rdev->ddev->irq_enabled)
359 		return;
360 
361 	if (atomic_dec_and_test(&rdev->irq.ring_int[ring])) {
362 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
363 		radeon_irq_set(rdev);
364 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
365 	}
366 }
367 
368 /**
369  * radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
370  *
371  * @rdev: radeon device pointer
372  * @crtc: crtc whose interrupt you want to enable
373  *
374  * Enables the pageflip interrupt for a specific crtc (all asics).
375  * For pageflips we use the vblank interrupt source.
376  */
377 void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
378 {
379 	unsigned long irqflags;
380 
381 	if (crtc < 0 || crtc >= rdev->num_crtc)
382 		return;
383 
384 	if (!rdev->ddev->irq_enabled)
385 		return;
386 
387 	if (atomic_inc_return(&rdev->irq.pflip[crtc]) == 1) {
388 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
389 		radeon_irq_set(rdev);
390 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
391 	}
392 }
393 
394 /**
395  * radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
396  *
397  * @rdev: radeon device pointer
398  * @crtc: crtc whose interrupt you want to disable
399  *
400  * Disables the pageflip interrupt for a specific crtc (all asics).
401  * For pageflips we use the vblank interrupt source.
402  */
403 void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
404 {
405 	unsigned long irqflags;
406 
407 	if (crtc < 0 || crtc >= rdev->num_crtc)
408 		return;
409 
410 	if (!rdev->ddev->irq_enabled)
411 		return;
412 
413 	if (atomic_dec_and_test(&rdev->irq.pflip[crtc])) {
414 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
415 		radeon_irq_set(rdev);
416 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
417 	}
418 }
419 
420 /**
421  * radeon_irq_kms_enable_afmt - enable audio format change interrupt
422  *
423  * @rdev: radeon device pointer
424  * @block: afmt block whose interrupt you want to enable
425  *
426  * Enables the afmt change interrupt for a specific afmt block (all asics).
427  */
428 void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
429 {
430 	unsigned long irqflags;
431 
432 	if (!rdev->ddev->irq_enabled)
433 		return;
434 
435 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
436 	rdev->irq.afmt[block] = true;
437 	radeon_irq_set(rdev);
438 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
439 
440 }
441 
442 /**
443  * radeon_irq_kms_disable_afmt - disable audio format change interrupt
444  *
445  * @rdev: radeon device pointer
446  * @block: afmt block whose interrupt you want to disable
447  *
448  * Disables the afmt change interrupt for a specific afmt block (all asics).
449  */
450 void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
451 {
452 	unsigned long irqflags;
453 
454 	if (!rdev->ddev->irq_enabled)
455 		return;
456 
457 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
458 	rdev->irq.afmt[block] = false;
459 	radeon_irq_set(rdev);
460 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
461 }
462 
463 /**
464  * radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
465  *
466  * @rdev: radeon device pointer
467  * @hpd_mask: mask of hpd pins you want to enable.
468  *
469  * Enables the hotplug detect interrupt for a specific hpd pin (all asics).
470  */
471 void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
472 {
473 	unsigned long irqflags;
474 	int i;
475 
476 	if (!rdev->ddev->irq_enabled)
477 		return;
478 
479 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
480 	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
481 		rdev->irq.hpd[i] |= !!(hpd_mask & (1 << i));
482 	radeon_irq_set(rdev);
483 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
484 }
485 
486 /**
487  * radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
488  *
489  * @rdev: radeon device pointer
490  * @hpd_mask: mask of hpd pins you want to disable.
491  *
492  * Disables the hotplug detect interrupt for a specific hpd pin (all asics).
493  */
494 void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
495 {
496 	unsigned long irqflags;
497 	int i;
498 
499 	if (!rdev->ddev->irq_enabled)
500 		return;
501 
502 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
503 	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
504 		rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
505 	radeon_irq_set(rdev);
506 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
507 }
508 
509