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drm/i915: Use our own workqueue to avoid wedging the system along with the GPU.
[linux-2.6/linux-2.6-openrd.git] / drivers / gpu / drm / i915 / i915_irq.c
blob83aee80e77a6c188a8235337b7d9a1de0dfb0dfd
1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
2 */
3 /*
4 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 */
28
29 #include <linux/sysrq.h>
30 #include "drmP.h"
31 #include "drm.h"
32 #include "i915_drm.h"
33 #include "i915_drv.h"
34 #include "intel_drv.h"
35
36 #define MAX_NOPID ((u32)~0)
37
38 /**
39 * Interrupts that are always left unmasked.
40 *
41 * Since pipe events are edge-triggered from the PIPESTAT register to IIR,
42 * we leave them always unmasked in IMR and then control enabling them through
43 * PIPESTAT alone.
44 */
45 #define I915_INTERRUPT_ENABLE_FIX (I915_ASLE_INTERRUPT | \
46 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
47 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | \
48 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
49
50 /** Interrupts that we mask and unmask at runtime. */
51 #define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT)
52
53 #define I915_PIPE_VBLANK_STATUS (PIPE_START_VBLANK_INTERRUPT_STATUS |\
54 PIPE_VBLANK_INTERRUPT_STATUS)
55
56 #define I915_PIPE_VBLANK_ENABLE (PIPE_START_VBLANK_INTERRUPT_ENABLE |\
57 PIPE_VBLANK_INTERRUPT_ENABLE)
58
59 #define DRM_I915_VBLANK_PIPE_ALL (DRM_I915_VBLANK_PIPE_A | \
60 DRM_I915_VBLANK_PIPE_B)
61
62 void
63 igdng_enable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
64 {
65 if ((dev_priv->gt_irq_mask_reg & mask) != 0) {
66 dev_priv->gt_irq_mask_reg &= ~mask;
67 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
68 (void) I915_READ(GTIMR);
69 }
70 }
71
72 static inline void
73 igdng_disable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
74 {
75 if ((dev_priv->gt_irq_mask_reg & mask) != mask) {
76 dev_priv->gt_irq_mask_reg |= mask;
77 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
78 (void) I915_READ(GTIMR);
79 }
80 }
81
82 /* For display hotplug interrupt */
83 void
84 igdng_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
85 {
86 if ((dev_priv->irq_mask_reg & mask) != 0) {
87 dev_priv->irq_mask_reg &= ~mask;
88 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
89 (void) I915_READ(DEIMR);
90 }
91 }
92
93 static inline void
94 igdng_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
95 {
96 if ((dev_priv->irq_mask_reg & mask) != mask) {
97 dev_priv->irq_mask_reg |= mask;
98 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
99 (void) I915_READ(DEIMR);
100 }
101 }
102
103 void
104 i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
105 {
106 if ((dev_priv->irq_mask_reg & mask) != 0) {
107 dev_priv->irq_mask_reg &= ~mask;
108 I915_WRITE(IMR, dev_priv->irq_mask_reg);
109 (void) I915_READ(IMR);
110 }
111 }
112
113 static inline void
114 i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
115 {
116 if ((dev_priv->irq_mask_reg & mask) != mask) {
117 dev_priv->irq_mask_reg |= mask;
118 I915_WRITE(IMR, dev_priv->irq_mask_reg);
119 (void) I915_READ(IMR);
120 }
121 }
122
123 static inline u32
124 i915_pipestat(int pipe)
125 {
126 if (pipe == 0)
127 return PIPEASTAT;
128 if (pipe == 1)
129 return PIPEBSTAT;
130 BUG();
131 }
132
133 void
134 i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
135 {
136 if ((dev_priv->pipestat[pipe] & mask) != mask) {
137 u32 reg = i915_pipestat(pipe);
138
139 dev_priv->pipestat[pipe] |= mask;
140 /* Enable the interrupt, clear any pending status */
141 I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
142 (void) I915_READ(reg);
143 }
144 }
145
146 void
147 i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
148 {
149 if ((dev_priv->pipestat[pipe] & mask) != 0) {
150 u32 reg = i915_pipestat(pipe);
151
152 dev_priv->pipestat[pipe] &= ~mask;
153 I915_WRITE(reg, dev_priv->pipestat[pipe]);
154 (void) I915_READ(reg);
155 }
156 }
157
158 /**
159 * i915_pipe_enabled - check if a pipe is enabled
160 * @dev: DRM device
161 * @pipe: pipe to check
162 *
163 * Reading certain registers when the pipe is disabled can hang the chip.
164 * Use this routine to make sure the PLL is running and the pipe is active
165 * before reading such registers if unsure.
166 */
167 static int
168 i915_pipe_enabled(struct drm_device *dev, int pipe)
169 {
170 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
171 unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
172
173 if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
174 return 1;
175
176 return 0;
177 }
178
179 /* Called from drm generic code, passed a 'crtc', which
180 * we use as a pipe index
181 */
182 u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
183 {
184 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
185 unsigned long high_frame;
186 unsigned long low_frame;
187 u32 high1, high2, low, count;
188
189 high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
190 low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
191
192 if (!i915_pipe_enabled(dev, pipe)) {
193 DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
194 return 0;
195 }
196
197 /*
198 * High & low register fields aren't synchronized, so make sure
199 * we get a low value that's stable across two reads of the high
200 * register.
201 */
202 do {
203 high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
204 PIPE_FRAME_HIGH_SHIFT);
205 low = ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
206 PIPE_FRAME_LOW_SHIFT);
207 high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
208 PIPE_FRAME_HIGH_SHIFT);
209 } while (high1 != high2);
210
211 count = (high1 << 8) | low;
212
213 return count;
214 }
215
216 u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
217 {
218 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
219 int reg = pipe ? PIPEB_FRMCOUNT_GM45 : PIPEA_FRMCOUNT_GM45;
220
221 if (!i915_pipe_enabled(dev, pipe)) {
222 DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
223 return 0;
224 }
225
226 return I915_READ(reg);
227 }
228
229 /*
230 * Handle hotplug events outside the interrupt handler proper.
231 */
232 static void i915_hotplug_work_func(struct work_struct *work)
233 {
234 drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
235 hotplug_work);
236 struct drm_device *dev = dev_priv->dev;
237 struct drm_mode_config *mode_config = &dev->mode_config;
238 struct drm_connector *connector;
239
240 if (mode_config->num_connector) {
241 list_for_each_entry(connector, &mode_config->connector_list, head) {
242 struct intel_output *intel_output = to_intel_output(connector);
243
244 if (intel_output->hot_plug)
245 (*intel_output->hot_plug) (intel_output);
246 }
247 }
248 /* Just fire off a uevent and let userspace tell us what to do */
249 drm_sysfs_hotplug_event(dev);
250 }
251
252 irqreturn_t igdng_irq_handler(struct drm_device *dev)
253 {
254 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
255 int ret = IRQ_NONE;
256 u32 de_iir, gt_iir;
257 u32 new_de_iir, new_gt_iir;
258 struct drm_i915_master_private *master_priv;
259
260 de_iir = I915_READ(DEIIR);
261 gt_iir = I915_READ(GTIIR);
262
263 for (;;) {
264 if (de_iir == 0 && gt_iir == 0)
265 break;
266
267 ret = IRQ_HANDLED;
268
269 I915_WRITE(DEIIR, de_iir);
270 new_de_iir = I915_READ(DEIIR);
271 I915_WRITE(GTIIR, gt_iir);
272 new_gt_iir = I915_READ(GTIIR);
273
274 if (dev->primary->master) {
275 master_priv = dev->primary->master->driver_priv;
276 if (master_priv->sarea_priv)
277 master_priv->sarea_priv->last_dispatch =
278 READ_BREADCRUMB(dev_priv);
279 }
280
281 if (gt_iir & GT_USER_INTERRUPT) {
282 dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
283 DRM_WAKEUP(&dev_priv->irq_queue);
284 }
285
286 de_iir = new_de_iir;
287 gt_iir = new_gt_iir;
288 }
289
290 return ret;
291 }
292
293 /**
294 * i915_error_work_func - do process context error handling work
295 * @work: work struct
296 *
297 * Fire an error uevent so userspace can see that a hang or error
298 * was detected.
299 */
300 static void i915_error_work_func(struct work_struct *work)
301 {
302 drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
303 error_work);
304 struct drm_device *dev = dev_priv->dev;
305 char *event_string = "ERROR=1";
306 char *envp[] = { event_string, NULL };
307
308 DRM_DEBUG("generating error event\n");
309
310 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
311 }
312
313 /**
314 * i915_capture_error_state - capture an error record for later analysis
315 * @dev: drm device
316 *
317 * Should be called when an error is detected (either a hang or an error
318 * interrupt) to capture error state from the time of the error. Fills
319 * out a structure which becomes available in debugfs for user level tools
320 * to pick up.
321 */
322 static void i915_capture_error_state(struct drm_device *dev)
323 {
324 struct drm_i915_private *dev_priv = dev->dev_private;
325 struct drm_i915_error_state *error;
326 unsigned long flags;
327
328 spin_lock_irqsave(&dev_priv->error_lock, flags);
329 if (dev_priv->first_error)
330 goto out;
331
332 error = kmalloc(sizeof(*error), GFP_ATOMIC);
333 if (!error) {
334 DRM_DEBUG("out ot memory, not capturing error state\n");
335 goto out;
336 }
337
338 error->eir = I915_READ(EIR);
339 error->pgtbl_er = I915_READ(PGTBL_ER);
340 error->pipeastat = I915_READ(PIPEASTAT);
341 error->pipebstat = I915_READ(PIPEBSTAT);
342 error->instpm = I915_READ(INSTPM);
343 if (!IS_I965G(dev)) {
344 error->ipeir = I915_READ(IPEIR);
345 error->ipehr = I915_READ(IPEHR);
346 error->instdone = I915_READ(INSTDONE);
347 error->acthd = I915_READ(ACTHD);
348 } else {
349 error->ipeir = I915_READ(IPEIR_I965);
350 error->ipehr = I915_READ(IPEHR_I965);
351 error->instdone = I915_READ(INSTDONE_I965);
352 error->instps = I915_READ(INSTPS);
353 error->instdone1 = I915_READ(INSTDONE1);
354 error->acthd = I915_READ(ACTHD_I965);
355 }
356
357 do_gettimeofday(&error->time);
358
359 dev_priv->first_error = error;
360
361 out:
362 spin_unlock_irqrestore(&dev_priv->error_lock, flags);
363 }
364
365 /**
366 * i915_handle_error - handle an error interrupt
367 * @dev: drm device
368 *
369 * Do some basic checking of regsiter state at error interrupt time and
370 * dump it to the syslog. Also call i915_capture_error_state() to make
371 * sure we get a record and make it available in debugfs. Fire a uevent
372 * so userspace knows something bad happened (should trigger collection
373 * of a ring dump etc.).
374 */
375 static void i915_handle_error(struct drm_device *dev)
376 {
377 struct drm_i915_private *dev_priv = dev->dev_private;
378 u32 eir = I915_READ(EIR);
379 u32 pipea_stats = I915_READ(PIPEASTAT);
380 u32 pipeb_stats = I915_READ(PIPEBSTAT);
381
382 i915_capture_error_state(dev);
383
384 printk(KERN_ERR "render error detected, EIR: 0x%08x\n",
385 eir);
386
387 if (IS_G4X(dev)) {
388 if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
389 u32 ipeir = I915_READ(IPEIR_I965);
390
391 printk(KERN_ERR " IPEIR: 0x%08x\n",
392 I915_READ(IPEIR_I965));
393 printk(KERN_ERR " IPEHR: 0x%08x\n",
394 I915_READ(IPEHR_I965));
395 printk(KERN_ERR " INSTDONE: 0x%08x\n",
396 I915_READ(INSTDONE_I965));
397 printk(KERN_ERR " INSTPS: 0x%08x\n",
398 I915_READ(INSTPS));
399 printk(KERN_ERR " INSTDONE1: 0x%08x\n",
400 I915_READ(INSTDONE1));
401 printk(KERN_ERR " ACTHD: 0x%08x\n",
402 I915_READ(ACTHD_I965));
403 I915_WRITE(IPEIR_I965, ipeir);
404 (void)I915_READ(IPEIR_I965);
405 }
406 if (eir & GM45_ERROR_PAGE_TABLE) {
407 u32 pgtbl_err = I915_READ(PGTBL_ER);
408 printk(KERN_ERR "page table error\n");
409 printk(KERN_ERR " PGTBL_ER: 0x%08x\n",
410 pgtbl_err);
411 I915_WRITE(PGTBL_ER, pgtbl_err);
412 (void)I915_READ(PGTBL_ER);
413 }
414 }
415
416 if (IS_I9XX(dev)) {
417 if (eir & I915_ERROR_PAGE_TABLE) {
418 u32 pgtbl_err = I915_READ(PGTBL_ER);
419 printk(KERN_ERR "page table error\n");
420 printk(KERN_ERR " PGTBL_ER: 0x%08x\n",
421 pgtbl_err);
422 I915_WRITE(PGTBL_ER, pgtbl_err);
423 (void)I915_READ(PGTBL_ER);
424 }
425 }
426
427 if (eir & I915_ERROR_MEMORY_REFRESH) {
428 printk(KERN_ERR "memory refresh error\n");
429 printk(KERN_ERR "PIPEASTAT: 0x%08x\n",
430 pipea_stats);
431 printk(KERN_ERR "PIPEBSTAT: 0x%08x\n",
432 pipeb_stats);
433 /* pipestat has already been acked */
434 }
435 if (eir & I915_ERROR_INSTRUCTION) {
436 printk(KERN_ERR "instruction error\n");
437 printk(KERN_ERR " INSTPM: 0x%08x\n",
438 I915_READ(INSTPM));
439 if (!IS_I965G(dev)) {
440 u32 ipeir = I915_READ(IPEIR);
441
442 printk(KERN_ERR " IPEIR: 0x%08x\n",
443 I915_READ(IPEIR));
444 printk(KERN_ERR " IPEHR: 0x%08x\n",
445 I915_READ(IPEHR));
446 printk(KERN_ERR " INSTDONE: 0x%08x\n",
447 I915_READ(INSTDONE));
448 printk(KERN_ERR " ACTHD: 0x%08x\n",
449 I915_READ(ACTHD));
450 I915_WRITE(IPEIR, ipeir);
451 (void)I915_READ(IPEIR);
452 } else {
453 u32 ipeir = I915_READ(IPEIR_I965);
454
455 printk(KERN_ERR " IPEIR: 0x%08x\n",
456 I915_READ(IPEIR_I965));
457 printk(KERN_ERR " IPEHR: 0x%08x\n",
458 I915_READ(IPEHR_I965));
459 printk(KERN_ERR " INSTDONE: 0x%08x\n",
460 I915_READ(INSTDONE_I965));
461 printk(KERN_ERR " INSTPS: 0x%08x\n",
462 I915_READ(INSTPS));
463 printk(KERN_ERR " INSTDONE1: 0x%08x\n",
464 I915_READ(INSTDONE1));
465 printk(KERN_ERR " ACTHD: 0x%08x\n",
466 I915_READ(ACTHD_I965));
467 I915_WRITE(IPEIR_I965, ipeir);
468 (void)I915_READ(IPEIR_I965);
469 }
470 }
471
472 I915_WRITE(EIR, eir);
473 (void)I915_READ(EIR);
474 eir = I915_READ(EIR);
475 if (eir) {
476 /*
477 * some errors might have become stuck,
478 * mask them.
479 */
480 DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
481 I915_WRITE(EMR, I915_READ(EMR) | eir);
482 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
483 }
484
485 queue_work(dev_priv->wq, &dev_priv->error_work);
486 }
487
488 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
489 {
490 struct drm_device *dev = (struct drm_device *) arg;
491 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
492 struct drm_i915_master_private *master_priv;
493 u32 iir, new_iir;
494 u32 pipea_stats, pipeb_stats;
495 u32 vblank_status;
496 u32 vblank_enable;
497 int vblank = 0;
498 unsigned long irqflags;
499 int irq_received;
500 int ret = IRQ_NONE;
501
502 atomic_inc(&dev_priv->irq_received);
503
504 if (IS_IGDNG(dev))
505 return igdng_irq_handler(dev);
506
507 iir = I915_READ(IIR);
508
509 if (IS_I965G(dev)) {
510 vblank_status = I915_START_VBLANK_INTERRUPT_STATUS;
511 vblank_enable = PIPE_START_VBLANK_INTERRUPT_ENABLE;
512 } else {
513 vblank_status = I915_VBLANK_INTERRUPT_STATUS;
514 vblank_enable = I915_VBLANK_INTERRUPT_ENABLE;
515 }
516
517 for (;;) {
518 irq_received = iir != 0;
519
520 /* Can't rely on pipestat interrupt bit in iir as it might
521 * have been cleared after the pipestat interrupt was received.
522 * It doesn't set the bit in iir again, but it still produces
523 * interrupts (for non-MSI).
524 */
525 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
526 pipea_stats = I915_READ(PIPEASTAT);
527 pipeb_stats = I915_READ(PIPEBSTAT);
528
529 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
530 i915_handle_error(dev);
531
532 /*
533 * Clear the PIPE(A|B)STAT regs before the IIR
534 */
535 if (pipea_stats & 0x8000ffff) {
536 if (pipea_stats & PIPE_FIFO_UNDERRUN_STATUS)
537 DRM_DEBUG("pipe a underrun\n");
538 I915_WRITE(PIPEASTAT, pipea_stats);
539 irq_received = 1;
540 }
541
542 if (pipeb_stats & 0x8000ffff) {
543 if (pipeb_stats & PIPE_FIFO_UNDERRUN_STATUS)
544 DRM_DEBUG("pipe b underrun\n");
545 I915_WRITE(PIPEBSTAT, pipeb_stats);
546 irq_received = 1;
547 }
548 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
549
550 if (!irq_received)
551 break;
552
553 ret = IRQ_HANDLED;
554
555 /* Consume port. Then clear IIR or we'll miss events */
556 if ((I915_HAS_HOTPLUG(dev)) &&
557 (iir & I915_DISPLAY_PORT_INTERRUPT)) {
558 u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
559
560 DRM_DEBUG("hotplug event received, stat 0x%08x\n",
561 hotplug_status);
562 if (hotplug_status & dev_priv->hotplug_supported_mask)
563 queue_work(dev_priv->wq,
564 &dev_priv->hotplug_work);
565
566 I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
567 I915_READ(PORT_HOTPLUG_STAT);
568 }
569
570 I915_WRITE(IIR, iir);
571 new_iir = I915_READ(IIR); /* Flush posted writes */
572
573 if (dev->primary->master) {
574 master_priv = dev->primary->master->driver_priv;
575 if (master_priv->sarea_priv)
576 master_priv->sarea_priv->last_dispatch =
577 READ_BREADCRUMB(dev_priv);
578 }
579
580 if (iir & I915_USER_INTERRUPT) {
581 dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
582 DRM_WAKEUP(&dev_priv->irq_queue);
583 }
584
585 if (pipea_stats & vblank_status) {
586 vblank++;
587 drm_handle_vblank(dev, 0);
588 }
589
590 if (pipeb_stats & vblank_status) {
591 vblank++;
592 drm_handle_vblank(dev, 1);
593 }
594
595 if ((pipeb_stats & I915_LEGACY_BLC_EVENT_STATUS) ||
596 (iir & I915_ASLE_INTERRUPT))
597 opregion_asle_intr(dev);
598
599 /* With MSI, interrupts are only generated when iir
600 * transitions from zero to nonzero. If another bit got
601 * set while we were handling the existing iir bits, then
602 * we would never get another interrupt.
603 *
604 * This is fine on non-MSI as well, as if we hit this path
605 * we avoid exiting the interrupt handler only to generate
606 * another one.
607 *
608 * Note that for MSI this could cause a stray interrupt report
609 * if an interrupt landed in the time between writing IIR and
610 * the posting read. This should be rare enough to never
611 * trigger the 99% of 100,000 interrupts test for disabling
612 * stray interrupts.
613 */
614 iir = new_iir;
615 }
616
617 return ret;
618 }
619
620 static int i915_emit_irq(struct drm_device * dev)
621 {
622 drm_i915_private_t *dev_priv = dev->dev_private;
623 struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
624 RING_LOCALS;
625
626 i915_kernel_lost_context(dev);
627
628 DRM_DEBUG("\n");
629
630 dev_priv->counter++;
631 if (dev_priv->counter > 0x7FFFFFFFUL)
632 dev_priv->counter = 1;
633 if (master_priv->sarea_priv)
634 master_priv->sarea_priv->last_enqueue = dev_priv->counter;
635
636 BEGIN_LP_RING(4);
637 OUT_RING(MI_STORE_DWORD_INDEX);
638 OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
639 OUT_RING(dev_priv->counter);
640 OUT_RING(MI_USER_INTERRUPT);
641 ADVANCE_LP_RING();
642
643 return dev_priv->counter;
644 }
645
646 void i915_user_irq_get(struct drm_device *dev)
647 {
648 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
649 unsigned long irqflags;
650
651 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
652 if (dev->irq_enabled && (++dev_priv->user_irq_refcount == 1)) {
653 if (IS_IGDNG(dev))
654 igdng_enable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
655 else
656 i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
657 }
658 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
659 }
660
661 void i915_user_irq_put(struct drm_device *dev)
662 {
663 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
664 unsigned long irqflags;
665
666 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
667 BUG_ON(dev->irq_enabled && dev_priv->user_irq_refcount <= 0);
668 if (dev->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
669 if (IS_IGDNG(dev))
670 igdng_disable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
671 else
672 i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
673 }
674 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
675 }
676
677 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
678 {
679 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
680 struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
681 int ret = 0;
682
683 DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
684 READ_BREADCRUMB(dev_priv));
685
686 if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
687 if (master_priv->sarea_priv)
688 master_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
689 return 0;
690 }
691
692 if (master_priv->sarea_priv)
693 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
694
695 i915_user_irq_get(dev);
696 DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
697 READ_BREADCRUMB(dev_priv) >= irq_nr);
698 i915_user_irq_put(dev);
699
700 if (ret == -EBUSY) {
701 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
702 READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
703 }
704
705 return ret;
706 }
707
708 /* Needs the lock as it touches the ring.
709 */
710 int i915_irq_emit(struct drm_device *dev, void *data,
711 struct drm_file *file_priv)
712 {
713 drm_i915_private_t *dev_priv = dev->dev_private;
714 drm_i915_irq_emit_t *emit = data;
715 int result;
716
717 if (!dev_priv || !dev_priv->ring.virtual_start) {
718 DRM_ERROR("called with no initialization\n");
719 return -EINVAL;
720 }
721
722 RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
723
724 mutex_lock(&dev->struct_mutex);
725 result = i915_emit_irq(dev);
726 mutex_unlock(&dev->struct_mutex);
727
728 if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
729 DRM_ERROR("copy_to_user\n");
730 return -EFAULT;
731 }
732
733 return 0;
734 }
735
736 /* Doesn't need the hardware lock.
737 */
738 int i915_irq_wait(struct drm_device *dev, void *data,
739 struct drm_file *file_priv)
740 {
741 drm_i915_private_t *dev_priv = dev->dev_private;
742 drm_i915_irq_wait_t *irqwait = data;
743
744 if (!dev_priv) {
745 DRM_ERROR("called with no initialization\n");
746 return -EINVAL;
747 }
748
749 return i915_wait_irq(dev, irqwait->irq_seq);
750 }
751
752 /* Called from drm generic code, passed 'crtc' which
753 * we use as a pipe index
754 */
755 int i915_enable_vblank(struct drm_device *dev, int pipe)
756 {
757 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
758 unsigned long irqflags;
759 int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
760 u32 pipeconf;
761
762 pipeconf = I915_READ(pipeconf_reg);
763 if (!(pipeconf & PIPEACONF_ENABLE))
764 return -EINVAL;
765
766 if (IS_IGDNG(dev))
767 return 0;
768
769 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
770 if (IS_I965G(dev))
771 i915_enable_pipestat(dev_priv, pipe,
772 PIPE_START_VBLANK_INTERRUPT_ENABLE);
773 else
774 i915_enable_pipestat(dev_priv, pipe,
775 PIPE_VBLANK_INTERRUPT_ENABLE);
776 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
777 return 0;
778 }
779
780 /* Called from drm generic code, passed 'crtc' which
781 * we use as a pipe index
782 */
783 void i915_disable_vblank(struct drm_device *dev, int pipe)
784 {
785 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
786 unsigned long irqflags;
787
788 if (IS_IGDNG(dev))
789 return;
790
791 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
792 i915_disable_pipestat(dev_priv, pipe,
793 PIPE_VBLANK_INTERRUPT_ENABLE |
794 PIPE_START_VBLANK_INTERRUPT_ENABLE);
795 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
796 }
797
798 void i915_enable_interrupt (struct drm_device *dev)
799 {
800 struct drm_i915_private *dev_priv = dev->dev_private;
801
802 if (!IS_IGDNG(dev))
803 opregion_enable_asle(dev);
804 dev_priv->irq_enabled = 1;
805 }
806
807
808 /* Set the vblank monitor pipe
809 */
810 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
811 struct drm_file *file_priv)
812 {
813 drm_i915_private_t *dev_priv = dev->dev_private;
814
815 if (!dev_priv) {
816 DRM_ERROR("called with no initialization\n");
817 return -EINVAL;
818 }
819
820 return 0;
821 }
822
823 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
824 struct drm_file *file_priv)
825 {
826 drm_i915_private_t *dev_priv = dev->dev_private;
827 drm_i915_vblank_pipe_t *pipe = data;
828
829 if (!dev_priv) {
830 DRM_ERROR("called with no initialization\n");
831 return -EINVAL;
832 }
833
834 pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
835
836 return 0;
837 }
838
839 /**
840 * Schedule buffer swap at given vertical blank.
841 */
842 int i915_vblank_swap(struct drm_device *dev, void *data,
843 struct drm_file *file_priv)
844 {
845 /* The delayed swap mechanism was fundamentally racy, and has been
846 * removed. The model was that the client requested a delayed flip/swap
847 * from the kernel, then waited for vblank before continuing to perform
848 * rendering. The problem was that the kernel might wake the client
849 * up before it dispatched the vblank swap (since the lock has to be
850 * held while touching the ringbuffer), in which case the client would
851 * clear and start the next frame before the swap occurred, and
852 * flicker would occur in addition to likely missing the vblank.
853 *
854 * In the absence of this ioctl, userland falls back to a correct path
855 * of waiting for a vblank, then dispatching the swap on its own.
856 * Context switching to userland and back is plenty fast enough for
857 * meeting the requirements of vblank swapping.
858 */
859 return -EINVAL;
860 }
861
862 /* drm_dma.h hooks
863 */
864 static void igdng_irq_preinstall(struct drm_device *dev)
865 {
866 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
867
868 I915_WRITE(HWSTAM, 0xeffe);
869
870 /* XXX hotplug from PCH */
871
872 I915_WRITE(DEIMR, 0xffffffff);
873 I915_WRITE(DEIER, 0x0);
874 (void) I915_READ(DEIER);
875
876 /* and GT */
877 I915_WRITE(GTIMR, 0xffffffff);
878 I915_WRITE(GTIER, 0x0);
879 (void) I915_READ(GTIER);
880 }
881
882 static int igdng_irq_postinstall(struct drm_device *dev)
883 {
884 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
885 /* enable kind of interrupts always enabled */
886 u32 display_mask = DE_MASTER_IRQ_CONTROL /*| DE_PCH_EVENT */;
887 u32 render_mask = GT_USER_INTERRUPT;
888
889 dev_priv->irq_mask_reg = ~display_mask;
890 dev_priv->de_irq_enable_reg = display_mask;
891
892 /* should always can generate irq */
893 I915_WRITE(DEIIR, I915_READ(DEIIR));
894 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
895 I915_WRITE(DEIER, dev_priv->de_irq_enable_reg);
896 (void) I915_READ(DEIER);
897
898 /* user interrupt should be enabled, but masked initial */
899 dev_priv->gt_irq_mask_reg = 0xffffffff;
900 dev_priv->gt_irq_enable_reg = render_mask;
901
902 I915_WRITE(GTIIR, I915_READ(GTIIR));
903 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
904 I915_WRITE(GTIER, dev_priv->gt_irq_enable_reg);
905 (void) I915_READ(GTIER);
906
907 return 0;
908 }
909
910 void i915_driver_irq_preinstall(struct drm_device * dev)
911 {
912 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
913
914 atomic_set(&dev_priv->irq_received, 0);
915
916 INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
917 INIT_WORK(&dev_priv->error_work, i915_error_work_func);
918
919 if (IS_IGDNG(dev)) {
920 igdng_irq_preinstall(dev);
921 return;
922 }
923
924 if (I915_HAS_HOTPLUG(dev)) {
925 I915_WRITE(PORT_HOTPLUG_EN, 0);
926 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
927 }
928
929 I915_WRITE(HWSTAM, 0xeffe);
930 I915_WRITE(PIPEASTAT, 0);
931 I915_WRITE(PIPEBSTAT, 0);
932 I915_WRITE(IMR, 0xffffffff);
933 I915_WRITE(IER, 0x0);
934 (void) I915_READ(IER);
935 }
936
937 int i915_driver_irq_postinstall(struct drm_device *dev)
938 {
939 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
940 u32 enable_mask = I915_INTERRUPT_ENABLE_FIX | I915_INTERRUPT_ENABLE_VAR;
941 u32 error_mask;
942
943 DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
944
945 dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
946
947 if (IS_IGDNG(dev))
948 return igdng_irq_postinstall(dev);
949
950 /* Unmask the interrupts that we always want on. */
951 dev_priv->irq_mask_reg = ~I915_INTERRUPT_ENABLE_FIX;
952
953 dev_priv->pipestat[0] = 0;
954 dev_priv->pipestat[1] = 0;
955
956 if (I915_HAS_HOTPLUG(dev)) {
957 u32 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
958
959 /* Leave other bits alone */
960 hotplug_en |= HOTPLUG_EN_MASK;
961 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
962
963 dev_priv->hotplug_supported_mask = CRT_HOTPLUG_INT_STATUS |
964 TV_HOTPLUG_INT_STATUS | SDVOC_HOTPLUG_INT_STATUS |
965 SDVOB_HOTPLUG_INT_STATUS;
966 if (IS_G4X(dev)) {
967 dev_priv->hotplug_supported_mask |=
968 HDMIB_HOTPLUG_INT_STATUS |
969 HDMIC_HOTPLUG_INT_STATUS |
970 HDMID_HOTPLUG_INT_STATUS;
971 }
972 /* Enable in IER... */
973 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
974 /* and unmask in IMR */
975 i915_enable_irq(dev_priv, I915_DISPLAY_PORT_INTERRUPT);
976 }
977
978 /*
979 * Enable some error detection, note the instruction error mask
980 * bit is reserved, so we leave it masked.
981 */
982 if (IS_G4X(dev)) {
983 error_mask = ~(GM45_ERROR_PAGE_TABLE |
984 GM45_ERROR_MEM_PRIV |
985 GM45_ERROR_CP_PRIV |
986 I915_ERROR_MEMORY_REFRESH);
987 } else {
988 error_mask = ~(I915_ERROR_PAGE_TABLE |
989 I915_ERROR_MEMORY_REFRESH);
990 }
991 I915_WRITE(EMR, error_mask);
992
993 /* Disable pipe interrupt enables, clear pending pipe status */
994 I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
995 I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
996 /* Clear pending interrupt status */
997 I915_WRITE(IIR, I915_READ(IIR));
998
999 I915_WRITE(IER, enable_mask);
1000 I915_WRITE(IMR, dev_priv->irq_mask_reg);
1001 (void) I915_READ(IER);
1002
1003 opregion_enable_asle(dev);
1004
1005 return 0;
1006 }
1007
1008 static void igdng_irq_uninstall(struct drm_device *dev)
1009 {
1010 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1011 I915_WRITE(HWSTAM, 0xffffffff);
1012
1013 I915_WRITE(DEIMR, 0xffffffff);
1014 I915_WRITE(DEIER, 0x0);
1015 I915_WRITE(DEIIR, I915_READ(DEIIR));
1016
1017 I915_WRITE(GTIMR, 0xffffffff);
1018 I915_WRITE(GTIER, 0x0);
1019 I915_WRITE(GTIIR, I915_READ(GTIIR));
1020 }
1021
1022 void i915_driver_irq_uninstall(struct drm_device * dev)
1023 {
1024 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1025
1026 if (!dev_priv)
1027 return;
1028
1029 dev_priv->vblank_pipe = 0;
1030
1031 if (IS_IGDNG(dev)) {
1032 igdng_irq_uninstall(dev);
1033 return;
1034 }
1035
1036 if (I915_HAS_HOTPLUG(dev)) {
1037 I915_WRITE(PORT_HOTPLUG_EN, 0);
1038 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
1039 }
1040
1041 I915_WRITE(HWSTAM, 0xffffffff);
1042 I915_WRITE(PIPEASTAT, 0);
1043 I915_WRITE(PIPEBSTAT, 0);
1044 I915_WRITE(IMR, 0xffffffff);
1045 I915_WRITE(IER, 0x0);
1046
1047 I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
1048 I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
1049 I915_WRITE(IIR, I915_READ(IIR));
1050 }
linux 2.6 git repository for openrd