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drm/i915: set GFX_MODE to pre-Ivybridge default value even on Ivybridge
[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_ringbuffer.c
1 /*
2 * Copyright © 2008-2010 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 * Zou Nan hai <nanhai.zou@intel.com>
26 * Xiang Hai hao<haihao.xiang@intel.com>
27 *
28 */
29
30 #include "drmP.h"
31 #include "drm.h"
32 #include "i915_drv.h"
33 #include "i915_drm.h"
34 #include "i915_trace.h"
35 #include "intel_drv.h"
36
37 static inline int ring_space(struct intel_ring_buffer *ring)
38 {
39 int space = (ring->head & HEAD_ADDR) - (ring->tail + 8);
40 if (space < 0)
41 space += ring->size;
42 return space;
43 }
44
45 static u32 i915_gem_get_seqno(struct drm_device *dev)
46 {
47 drm_i915_private_t *dev_priv = dev->dev_private;
48 u32 seqno;
49
50 seqno = dev_priv->next_seqno;
51
52 /* reserve 0 for non-seqno */
53 if (++dev_priv->next_seqno == 0)
54 dev_priv->next_seqno = 1;
55
56 return seqno;
57 }
58
59 static int
60 render_ring_flush(struct intel_ring_buffer *ring,
61 u32 invalidate_domains,
62 u32 flush_domains)
63 {
64 struct drm_device *dev = ring->dev;
65 u32 cmd;
66 int ret;
67
68 /*
69 * read/write caches:
70 *
71 * I915_GEM_DOMAIN_RENDER is always invalidated, but is
72 * only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is
73 * also flushed at 2d versus 3d pipeline switches.
74 *
75 * read-only caches:
76 *
77 * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
78 * MI_READ_FLUSH is set, and is always flushed on 965.
79 *
80 * I915_GEM_DOMAIN_COMMAND may not exist?
81 *
82 * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
83 * invalidated when MI_EXE_FLUSH is set.
84 *
85 * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
86 * invalidated with every MI_FLUSH.
87 *
88 * TLBs:
89 *
90 * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
91 * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
92 * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
93 * are flushed at any MI_FLUSH.
94 */
95
96 cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;
97 if ((invalidate_domains|flush_domains) &
98 I915_GEM_DOMAIN_RENDER)
99 cmd &= ~MI_NO_WRITE_FLUSH;
100 if (INTEL_INFO(dev)->gen < 4) {
101 /*
102 * On the 965, the sampler cache always gets flushed
103 * and this bit is reserved.
104 */
105 if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER)
106 cmd |= MI_READ_FLUSH;
107 }
108 if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION)
109 cmd |= MI_EXE_FLUSH;
110
111 if (invalidate_domains & I915_GEM_DOMAIN_COMMAND &&
112 (IS_G4X(dev) || IS_GEN5(dev)))
113 cmd |= MI_INVALIDATE_ISP;
114
115 ret = intel_ring_begin(ring, 2);
116 if (ret)
117 return ret;
118
119 intel_ring_emit(ring, cmd);
120 intel_ring_emit(ring, MI_NOOP);
121 intel_ring_advance(ring);
122
123 return 0;
124 }
125
126 static void ring_write_tail(struct intel_ring_buffer *ring,
127 u32 value)
128 {
129 drm_i915_private_t *dev_priv = ring->dev->dev_private;
130 I915_WRITE_TAIL(ring, value);
131 }
132
133 u32 intel_ring_get_active_head(struct intel_ring_buffer *ring)
134 {
135 drm_i915_private_t *dev_priv = ring->dev->dev_private;
136 u32 acthd_reg = INTEL_INFO(ring->dev)->gen >= 4 ?
137 RING_ACTHD(ring->mmio_base) : ACTHD;
138
139 return I915_READ(acthd_reg);
140 }
141
142 static int init_ring_common(struct intel_ring_buffer *ring)
143 {
144 drm_i915_private_t *dev_priv = ring->dev->dev_private;
145 struct drm_i915_gem_object *obj = ring->obj;
146 u32 head;
147
148 /* Stop the ring if it's running. */
149 I915_WRITE_CTL(ring, 0);
150 I915_WRITE_HEAD(ring, 0);
151 ring->write_tail(ring, 0);
152
153 /* Initialize the ring. */
154 I915_WRITE_START(ring, obj->gtt_offset);
155 head = I915_READ_HEAD(ring) & HEAD_ADDR;
156
157 /* G45 ring initialization fails to reset head to zero */
158 if (head != 0) {
159 DRM_DEBUG_KMS("%s head not reset to zero "
160 "ctl %08x head %08x tail %08x start %08x\n",
161 ring->name,
162 I915_READ_CTL(ring),
163 I915_READ_HEAD(ring),
164 I915_READ_TAIL(ring),
165 I915_READ_START(ring));
166
167 I915_WRITE_HEAD(ring, 0);
168
169 if (I915_READ_HEAD(ring) & HEAD_ADDR) {
170 DRM_ERROR("failed to set %s head to zero "
171 "ctl %08x head %08x tail %08x start %08x\n",
172 ring->name,
173 I915_READ_CTL(ring),
174 I915_READ_HEAD(ring),
175 I915_READ_TAIL(ring),
176 I915_READ_START(ring));
177 }
178 }
179
180 I915_WRITE_CTL(ring,
181 ((ring->size - PAGE_SIZE) & RING_NR_PAGES)
182 | RING_REPORT_64K | RING_VALID);
183
184 /* If the head is still not zero, the ring is dead */
185 if ((I915_READ_CTL(ring) & RING_VALID) == 0 ||
186 I915_READ_START(ring) != obj->gtt_offset ||
187 (I915_READ_HEAD(ring) & HEAD_ADDR) != 0) {
188 DRM_ERROR("%s initialization failed "
189 "ctl %08x head %08x tail %08x start %08x\n",
190 ring->name,
191 I915_READ_CTL(ring),
192 I915_READ_HEAD(ring),
193 I915_READ_TAIL(ring),
194 I915_READ_START(ring));
195 return -EIO;
196 }
197
198 if (!drm_core_check_feature(ring->dev, DRIVER_MODESET))
199 i915_kernel_lost_context(ring->dev);
200 else {
201 ring->head = I915_READ_HEAD(ring);
202 ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
203 ring->space = ring_space(ring);
204 }
205
206 return 0;
207 }
208
209 /*
210 * 965+ support PIPE_CONTROL commands, which provide finer grained control
211 * over cache flushing.
212 */
213 struct pipe_control {
214 struct drm_i915_gem_object *obj;
215 volatile u32 *cpu_page;
216 u32 gtt_offset;
217 };
218
219 static int
220 init_pipe_control(struct intel_ring_buffer *ring)
221 {
222 struct pipe_control *pc;
223 struct drm_i915_gem_object *obj;
224 int ret;
225
226 if (ring->private)
227 return 0;
228
229 pc = kmalloc(sizeof(*pc), GFP_KERNEL);
230 if (!pc)
231 return -ENOMEM;
232
233 obj = i915_gem_alloc_object(ring->dev, 4096);
234 if (obj == NULL) {
235 DRM_ERROR("Failed to allocate seqno page\n");
236 ret = -ENOMEM;
237 goto err;
238 }
239
240 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
241
242 ret = i915_gem_object_pin(obj, 4096, true);
243 if (ret)
244 goto err_unref;
245
246 pc->gtt_offset = obj->gtt_offset;
247 pc->cpu_page = kmap(obj->pages[0]);
248 if (pc->cpu_page == NULL)
249 goto err_unpin;
250
251 pc->obj = obj;
252 ring->private = pc;
253 return 0;
254
255 err_unpin:
256 i915_gem_object_unpin(obj);
257 err_unref:
258 drm_gem_object_unreference(&obj->base);
259 err:
260 kfree(pc);
261 return ret;
262 }
263
264 static void
265 cleanup_pipe_control(struct intel_ring_buffer *ring)
266 {
267 struct pipe_control *pc = ring->private;
268 struct drm_i915_gem_object *obj;
269
270 if (!ring->private)
271 return;
272
273 obj = pc->obj;
274 kunmap(obj->pages[0]);
275 i915_gem_object_unpin(obj);
276 drm_gem_object_unreference(&obj->base);
277
278 kfree(pc);
279 ring->private = NULL;
280 }
281
282 static int init_render_ring(struct intel_ring_buffer *ring)
283 {
284 struct drm_device *dev = ring->dev;
285 struct drm_i915_private *dev_priv = dev->dev_private;
286 int ret = init_ring_common(ring);
287
288 if (INTEL_INFO(dev)->gen > 3) {
289 int mode = VS_TIMER_DISPATCH << 16 | VS_TIMER_DISPATCH;
290 if (IS_GEN6(dev) || IS_GEN7(dev))
291 mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;
292 I915_WRITE(MI_MODE, mode);
293 if (IS_GEN7(dev))
294 I915_WRITE(GFX_MODE_GEN7,
295 GFX_MODE_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) |
296 GFX_MODE_ENABLE(GFX_REPLAY_MODE));
297 }
298
299 if (INTEL_INFO(dev)->gen >= 6) {
300 } else if (IS_GEN5(dev)) {
301 ret = init_pipe_control(ring);
302 if (ret)
303 return ret;
304 }
305
306 return ret;
307 }
308
309 static void render_ring_cleanup(struct intel_ring_buffer *ring)
310 {
311 if (!ring->private)
312 return;
313
314 cleanup_pipe_control(ring);
315 }
316
317 static void
318 update_semaphore(struct intel_ring_buffer *ring, int i, u32 seqno)
319 {
320 struct drm_device *dev = ring->dev;
321 struct drm_i915_private *dev_priv = dev->dev_private;
322 int id;
323
324 /*
325 * cs -> 1 = vcs, 0 = bcs
326 * vcs -> 1 = bcs, 0 = cs,
327 * bcs -> 1 = cs, 0 = vcs.
328 */
329 id = ring - dev_priv->ring;
330 id += 2 - i;
331 id %= 3;
332
333 intel_ring_emit(ring,
334 MI_SEMAPHORE_MBOX |
335 MI_SEMAPHORE_REGISTER |
336 MI_SEMAPHORE_UPDATE);
337 intel_ring_emit(ring, seqno);
338 intel_ring_emit(ring,
339 RING_SYNC_0(dev_priv->ring[id].mmio_base) + 4*i);
340 }
341
342 static int
343 gen6_add_request(struct intel_ring_buffer *ring,
344 u32 *result)
345 {
346 u32 seqno;
347 int ret;
348
349 ret = intel_ring_begin(ring, 10);
350 if (ret)
351 return ret;
352
353 seqno = i915_gem_get_seqno(ring->dev);
354 update_semaphore(ring, 0, seqno);
355 update_semaphore(ring, 1, seqno);
356
357 intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
358 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
359 intel_ring_emit(ring, seqno);
360 intel_ring_emit(ring, MI_USER_INTERRUPT);
361 intel_ring_advance(ring);
362
363 *result = seqno;
364 return 0;
365 }
366
367 int
368 intel_ring_sync(struct intel_ring_buffer *ring,
369 struct intel_ring_buffer *to,
370 u32 seqno)
371 {
372 int ret;
373
374 ret = intel_ring_begin(ring, 4);
375 if (ret)
376 return ret;
377
378 intel_ring_emit(ring,
379 MI_SEMAPHORE_MBOX |
380 MI_SEMAPHORE_REGISTER |
381 intel_ring_sync_index(ring, to) << 17 |
382 MI_SEMAPHORE_COMPARE);
383 intel_ring_emit(ring, seqno);
384 intel_ring_emit(ring, 0);
385 intel_ring_emit(ring, MI_NOOP);
386 intel_ring_advance(ring);
387
388 return 0;
389 }
390
391 #define PIPE_CONTROL_FLUSH(ring__, addr__) \
392 do { \
393 intel_ring_emit(ring__, GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | \
394 PIPE_CONTROL_DEPTH_STALL | 2); \
395 intel_ring_emit(ring__, (addr__) | PIPE_CONTROL_GLOBAL_GTT); \
396 intel_ring_emit(ring__, 0); \
397 intel_ring_emit(ring__, 0); \
398 } while (0)
399
400 static int
401 pc_render_add_request(struct intel_ring_buffer *ring,
402 u32 *result)
403 {
404 struct drm_device *dev = ring->dev;
405 u32 seqno = i915_gem_get_seqno(dev);
406 struct pipe_control *pc = ring->private;
407 u32 scratch_addr = pc->gtt_offset + 128;
408 int ret;
409
410 /* For Ironlake, MI_USER_INTERRUPT was deprecated and apparently
411 * incoherent with writes to memory, i.e. completely fubar,
412 * so we need to use PIPE_NOTIFY instead.
413 *
414 * However, we also need to workaround the qword write
415 * incoherence by flushing the 6 PIPE_NOTIFY buffers out to
416 * memory before requesting an interrupt.
417 */
418 ret = intel_ring_begin(ring, 32);
419 if (ret)
420 return ret;
421
422 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
423 PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH);
424 intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
425 intel_ring_emit(ring, seqno);
426 intel_ring_emit(ring, 0);
427 PIPE_CONTROL_FLUSH(ring, scratch_addr);
428 scratch_addr += 128; /* write to separate cachelines */
429 PIPE_CONTROL_FLUSH(ring, scratch_addr);
430 scratch_addr += 128;
431 PIPE_CONTROL_FLUSH(ring, scratch_addr);
432 scratch_addr += 128;
433 PIPE_CONTROL_FLUSH(ring, scratch_addr);
434 scratch_addr += 128;
435 PIPE_CONTROL_FLUSH(ring, scratch_addr);
436 scratch_addr += 128;
437 PIPE_CONTROL_FLUSH(ring, scratch_addr);
438 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
439 PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH |
440 PIPE_CONTROL_NOTIFY);
441 intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
442 intel_ring_emit(ring, seqno);
443 intel_ring_emit(ring, 0);
444 intel_ring_advance(ring);
445
446 *result = seqno;
447 return 0;
448 }
449
450 static int
451 render_ring_add_request(struct intel_ring_buffer *ring,
452 u32 *result)
453 {
454 struct drm_device *dev = ring->dev;
455 u32 seqno = i915_gem_get_seqno(dev);
456 int ret;
457
458 ret = intel_ring_begin(ring, 4);
459 if (ret)
460 return ret;
461
462 intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
463 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
464 intel_ring_emit(ring, seqno);
465 intel_ring_emit(ring, MI_USER_INTERRUPT);
466 intel_ring_advance(ring);
467
468 *result = seqno;
469 return 0;
470 }
471
472 static u32
473 ring_get_seqno(struct intel_ring_buffer *ring)
474 {
475 return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
476 }
477
478 static u32
479 pc_render_get_seqno(struct intel_ring_buffer *ring)
480 {
481 struct pipe_control *pc = ring->private;
482 return pc->cpu_page[0];
483 }
484
485 static void
486 ironlake_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
487 {
488 dev_priv->gt_irq_mask &= ~mask;
489 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
490 POSTING_READ(GTIMR);
491 }
492
493 static void
494 ironlake_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
495 {
496 dev_priv->gt_irq_mask |= mask;
497 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
498 POSTING_READ(GTIMR);
499 }
500
501 static void
502 i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
503 {
504 dev_priv->irq_mask &= ~mask;
505 I915_WRITE(IMR, dev_priv->irq_mask);
506 POSTING_READ(IMR);
507 }
508
509 static void
510 i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
511 {
512 dev_priv->irq_mask |= mask;
513 I915_WRITE(IMR, dev_priv->irq_mask);
514 POSTING_READ(IMR);
515 }
516
517 static bool
518 render_ring_get_irq(struct intel_ring_buffer *ring)
519 {
520 struct drm_device *dev = ring->dev;
521 drm_i915_private_t *dev_priv = dev->dev_private;
522
523 if (!dev->irq_enabled)
524 return false;
525
526 spin_lock(&ring->irq_lock);
527 if (ring->irq_refcount++ == 0) {
528 if (HAS_PCH_SPLIT(dev))
529 ironlake_enable_irq(dev_priv,
530 GT_PIPE_NOTIFY | GT_USER_INTERRUPT);
531 else
532 i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
533 }
534 spin_unlock(&ring->irq_lock);
535
536 return true;
537 }
538
539 static void
540 render_ring_put_irq(struct intel_ring_buffer *ring)
541 {
542 struct drm_device *dev = ring->dev;
543 drm_i915_private_t *dev_priv = dev->dev_private;
544
545 spin_lock(&ring->irq_lock);
546 if (--ring->irq_refcount == 0) {
547 if (HAS_PCH_SPLIT(dev))
548 ironlake_disable_irq(dev_priv,
549 GT_USER_INTERRUPT |
550 GT_PIPE_NOTIFY);
551 else
552 i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
553 }
554 spin_unlock(&ring->irq_lock);
555 }
556
557 void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
558 {
559 struct drm_device *dev = ring->dev;
560 drm_i915_private_t *dev_priv = ring->dev->dev_private;
561 u32 mmio = 0;
562
563 /* The ring status page addresses are no longer next to the rest of
564 * the ring registers as of gen7.
565 */
566 if (IS_GEN7(dev)) {
567 switch (ring->id) {
568 case RING_RENDER:
569 mmio = RENDER_HWS_PGA_GEN7;
570 break;
571 case RING_BLT:
572 mmio = BLT_HWS_PGA_GEN7;
573 break;
574 case RING_BSD:
575 mmio = BSD_HWS_PGA_GEN7;
576 break;
577 }
578 } else if (IS_GEN6(ring->dev)) {
579 mmio = RING_HWS_PGA_GEN6(ring->mmio_base);
580 } else {
581 mmio = RING_HWS_PGA(ring->mmio_base);
582 }
583
584 I915_WRITE(mmio, (u32)ring->status_page.gfx_addr);
585 POSTING_READ(mmio);
586 }
587
588 static int
589 bsd_ring_flush(struct intel_ring_buffer *ring,
590 u32 invalidate_domains,
591 u32 flush_domains)
592 {
593 int ret;
594
595 ret = intel_ring_begin(ring, 2);
596 if (ret)
597 return ret;
598
599 intel_ring_emit(ring, MI_FLUSH);
600 intel_ring_emit(ring, MI_NOOP);
601 intel_ring_advance(ring);
602 return 0;
603 }
604
605 static int
606 ring_add_request(struct intel_ring_buffer *ring,
607 u32 *result)
608 {
609 u32 seqno;
610 int ret;
611
612 ret = intel_ring_begin(ring, 4);
613 if (ret)
614 return ret;
615
616 seqno = i915_gem_get_seqno(ring->dev);
617
618 intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
619 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
620 intel_ring_emit(ring, seqno);
621 intel_ring_emit(ring, MI_USER_INTERRUPT);
622 intel_ring_advance(ring);
623
624 *result = seqno;
625 return 0;
626 }
627
628 static bool
629 gen6_ring_get_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
630 {
631 struct drm_device *dev = ring->dev;
632 drm_i915_private_t *dev_priv = dev->dev_private;
633
634 if (!dev->irq_enabled)
635 return false;
636
637 spin_lock(&ring->irq_lock);
638 if (ring->irq_refcount++ == 0) {
639 ring->irq_mask &= ~rflag;
640 I915_WRITE_IMR(ring, ring->irq_mask);
641 ironlake_enable_irq(dev_priv, gflag);
642 }
643 spin_unlock(&ring->irq_lock);
644
645 return true;
646 }
647
648 static void
649 gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
650 {
651 struct drm_device *dev = ring->dev;
652 drm_i915_private_t *dev_priv = dev->dev_private;
653
654 spin_lock(&ring->irq_lock);
655 if (--ring->irq_refcount == 0) {
656 ring->irq_mask |= rflag;
657 I915_WRITE_IMR(ring, ring->irq_mask);
658 ironlake_disable_irq(dev_priv, gflag);
659 }
660 spin_unlock(&ring->irq_lock);
661 }
662
663 static bool
664 bsd_ring_get_irq(struct intel_ring_buffer *ring)
665 {
666 struct drm_device *dev = ring->dev;
667 drm_i915_private_t *dev_priv = dev->dev_private;
668
669 if (!dev->irq_enabled)
670 return false;
671
672 spin_lock(&ring->irq_lock);
673 if (ring->irq_refcount++ == 0) {
674 if (IS_G4X(dev))
675 i915_enable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
676 else
677 ironlake_enable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
678 }
679 spin_unlock(&ring->irq_lock);
680
681 return true;
682 }
683 static void
684 bsd_ring_put_irq(struct intel_ring_buffer *ring)
685 {
686 struct drm_device *dev = ring->dev;
687 drm_i915_private_t *dev_priv = dev->dev_private;
688
689 spin_lock(&ring->irq_lock);
690 if (--ring->irq_refcount == 0) {
691 if (IS_G4X(dev))
692 i915_disable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
693 else
694 ironlake_disable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
695 }
696 spin_unlock(&ring->irq_lock);
697 }
698
699 static int
700 ring_dispatch_execbuffer(struct intel_ring_buffer *ring, u32 offset, u32 length)
701 {
702 int ret;
703
704 ret = intel_ring_begin(ring, 2);
705 if (ret)
706 return ret;
707
708 intel_ring_emit(ring,
709 MI_BATCH_BUFFER_START | (2 << 6) |
710 MI_BATCH_NON_SECURE_I965);
711 intel_ring_emit(ring, offset);
712 intel_ring_advance(ring);
713
714 return 0;
715 }
716
717 static int
718 render_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
719 u32 offset, u32 len)
720 {
721 struct drm_device *dev = ring->dev;
722 int ret;
723
724 if (IS_I830(dev) || IS_845G(dev)) {
725 ret = intel_ring_begin(ring, 4);
726 if (ret)
727 return ret;
728
729 intel_ring_emit(ring, MI_BATCH_BUFFER);
730 intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);
731 intel_ring_emit(ring, offset + len - 8);
732 intel_ring_emit(ring, 0);
733 } else {
734 ret = intel_ring_begin(ring, 2);
735 if (ret)
736 return ret;
737
738 if (INTEL_INFO(dev)->gen >= 4) {
739 intel_ring_emit(ring,
740 MI_BATCH_BUFFER_START | (2 << 6) |
741 MI_BATCH_NON_SECURE_I965);
742 intel_ring_emit(ring, offset);
743 } else {
744 intel_ring_emit(ring,
745 MI_BATCH_BUFFER_START | (2 << 6));
746 intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);
747 }
748 }
749 intel_ring_advance(ring);
750
751 return 0;
752 }
753
754 static void cleanup_status_page(struct intel_ring_buffer *ring)
755 {
756 drm_i915_private_t *dev_priv = ring->dev->dev_private;
757 struct drm_i915_gem_object *obj;
758
759 obj = ring->status_page.obj;
760 if (obj == NULL)
761 return;
762
763 kunmap(obj->pages[0]);
764 i915_gem_object_unpin(obj);
765 drm_gem_object_unreference(&obj->base);
766 ring->status_page.obj = NULL;
767
768 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
769 }
770
771 static int init_status_page(struct intel_ring_buffer *ring)
772 {
773 struct drm_device *dev = ring->dev;
774 drm_i915_private_t *dev_priv = dev->dev_private;
775 struct drm_i915_gem_object *obj;
776 int ret;
777
778 obj = i915_gem_alloc_object(dev, 4096);
779 if (obj == NULL) {
780 DRM_ERROR("Failed to allocate status page\n");
781 ret = -ENOMEM;
782 goto err;
783 }
784
785 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
786
787 ret = i915_gem_object_pin(obj, 4096, true);
788 if (ret != 0) {
789 goto err_unref;
790 }
791
792 ring->status_page.gfx_addr = obj->gtt_offset;
793 ring->status_page.page_addr = kmap(obj->pages[0]);
794 if (ring->status_page.page_addr == NULL) {
795 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
796 goto err_unpin;
797 }
798 ring->status_page.obj = obj;
799 memset(ring->status_page.page_addr, 0, PAGE_SIZE);
800
801 intel_ring_setup_status_page(ring);
802 DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
803 ring->name, ring->status_page.gfx_addr);
804
805 return 0;
806
807 err_unpin:
808 i915_gem_object_unpin(obj);
809 err_unref:
810 drm_gem_object_unreference(&obj->base);
811 err:
812 return ret;
813 }
814
815 int intel_init_ring_buffer(struct drm_device *dev,
816 struct intel_ring_buffer *ring)
817 {
818 struct drm_i915_gem_object *obj;
819 int ret;
820
821 ring->dev = dev;
822 INIT_LIST_HEAD(&ring->active_list);
823 INIT_LIST_HEAD(&ring->request_list);
824 INIT_LIST_HEAD(&ring->gpu_write_list);
825
826 init_waitqueue_head(&ring->irq_queue);
827 spin_lock_init(&ring->irq_lock);
828 ring->irq_mask = ~0;
829
830 if (I915_NEED_GFX_HWS(dev)) {
831 ret = init_status_page(ring);
832 if (ret)
833 return ret;
834 }
835
836 obj = i915_gem_alloc_object(dev, ring->size);
837 if (obj == NULL) {
838 DRM_ERROR("Failed to allocate ringbuffer\n");
839 ret = -ENOMEM;
840 goto err_hws;
841 }
842
843 ring->obj = obj;
844
845 ret = i915_gem_object_pin(obj, PAGE_SIZE, true);
846 if (ret)
847 goto err_unref;
848
849 ring->map.size = ring->size;
850 ring->map.offset = dev->agp->base + obj->gtt_offset;
851 ring->map.type = 0;
852 ring->map.flags = 0;
853 ring->map.mtrr = 0;
854
855 drm_core_ioremap_wc(&ring->map, dev);
856 if (ring->map.handle == NULL) {
857 DRM_ERROR("Failed to map ringbuffer.\n");
858 ret = -EINVAL;
859 goto err_unpin;
860 }
861
862 ring->virtual_start = ring->map.handle;
863 ret = ring->init(ring);
864 if (ret)
865 goto err_unmap;
866
867 /* Workaround an erratum on the i830 which causes a hang if
868 * the TAIL pointer points to within the last 2 cachelines
869 * of the buffer.
870 */
871 ring->effective_size = ring->size;
872 if (IS_I830(ring->dev))
873 ring->effective_size -= 128;
874
875 return 0;
876
877 err_unmap:
878 drm_core_ioremapfree(&ring->map, dev);
879 err_unpin:
880 i915_gem_object_unpin(obj);
881 err_unref:
882 drm_gem_object_unreference(&obj->base);
883 ring->obj = NULL;
884 err_hws:
885 cleanup_status_page(ring);
886 return ret;
887 }
888
889 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring)
890 {
891 struct drm_i915_private *dev_priv;
892 int ret;
893
894 if (ring->obj == NULL)
895 return;
896
897 /* Disable the ring buffer. The ring must be idle at this point */
898 dev_priv = ring->dev->dev_private;
899 ret = intel_wait_ring_idle(ring);
900 if (ret)
901 DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
902 ring->name, ret);
903
904 I915_WRITE_CTL(ring, 0);
905
906 drm_core_ioremapfree(&ring->map, ring->dev);
907
908 i915_gem_object_unpin(ring->obj);
909 drm_gem_object_unreference(&ring->obj->base);
910 ring->obj = NULL;
911
912 if (ring->cleanup)
913 ring->cleanup(ring);
914
915 cleanup_status_page(ring);
916 }
917
918 static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring)
919 {
920 unsigned int *virt;
921 int rem = ring->size - ring->tail;
922
923 if (ring->space < rem) {
924 int ret = intel_wait_ring_buffer(ring, rem);
925 if (ret)
926 return ret;
927 }
928
929 virt = (unsigned int *)(ring->virtual_start + ring->tail);
930 rem /= 8;
931 while (rem--) {
932 *virt++ = MI_NOOP;
933 *virt++ = MI_NOOP;
934 }
935
936 ring->tail = 0;
937 ring->space = ring_space(ring);
938
939 return 0;
940 }
941
942 int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n)
943 {
944 struct drm_device *dev = ring->dev;
945 struct drm_i915_private *dev_priv = dev->dev_private;
946 unsigned long end;
947 u32 head;
948
949 /* If the reported head position has wrapped or hasn't advanced,
950 * fallback to the slow and accurate path.
951 */
952 head = intel_read_status_page(ring, 4);
953 if (head > ring->head) {
954 ring->head = head;
955 ring->space = ring_space(ring);
956 if (ring->space >= n)
957 return 0;
958 }
959
960 trace_i915_ring_wait_begin(ring);
961 end = jiffies + 3 * HZ;
962 do {
963 ring->head = I915_READ_HEAD(ring);
964 ring->space = ring_space(ring);
965 if (ring->space >= n) {
966 trace_i915_ring_wait_end(ring);
967 return 0;
968 }
969
970 if (dev->primary->master) {
971 struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
972 if (master_priv->sarea_priv)
973 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
974 }
975
976 msleep(1);
977 if (atomic_read(&dev_priv->mm.wedged))
978 return -EAGAIN;
979 } while (!time_after(jiffies, end));
980 trace_i915_ring_wait_end(ring);
981 return -EBUSY;
982 }
983
984 int intel_ring_begin(struct intel_ring_buffer *ring,
985 int num_dwords)
986 {
987 struct drm_i915_private *dev_priv = ring->dev->dev_private;
988 int n = 4*num_dwords;
989 int ret;
990
991 if (unlikely(atomic_read(&dev_priv->mm.wedged)))
992 return -EIO;
993
994 if (unlikely(ring->tail + n > ring->effective_size)) {
995 ret = intel_wrap_ring_buffer(ring);
996 if (unlikely(ret))
997 return ret;
998 }
999
1000 if (unlikely(ring->space < n)) {
1001 ret = intel_wait_ring_buffer(ring, n);
1002 if (unlikely(ret))
1003 return ret;
1004 }
1005
1006 ring->space -= n;
1007 return 0;
1008 }
1009
1010 void intel_ring_advance(struct intel_ring_buffer *ring)
1011 {
1012 ring->tail &= ring->size - 1;
1013 ring->write_tail(ring, ring->tail);
1014 }
1015
1016 static const struct intel_ring_buffer render_ring = {
1017 .name = "render ring",
1018 .id = RING_RENDER,
1019 .mmio_base = RENDER_RING_BASE,
1020 .size = 32 * PAGE_SIZE,
1021 .init = init_render_ring,
1022 .write_tail = ring_write_tail,
1023 .flush = render_ring_flush,
1024 .add_request = render_ring_add_request,
1025 .get_seqno = ring_get_seqno,
1026 .irq_get = render_ring_get_irq,
1027 .irq_put = render_ring_put_irq,
1028 .dispatch_execbuffer = render_ring_dispatch_execbuffer,
1029 .cleanup = render_ring_cleanup,
1030 };
1031
1032 /* ring buffer for bit-stream decoder */
1033
1034 static const struct intel_ring_buffer bsd_ring = {
1035 .name = "bsd ring",
1036 .id = RING_BSD,
1037 .mmio_base = BSD_RING_BASE,
1038 .size = 32 * PAGE_SIZE,
1039 .init = init_ring_common,
1040 .write_tail = ring_write_tail,
1041 .flush = bsd_ring_flush,
1042 .add_request = ring_add_request,
1043 .get_seqno = ring_get_seqno,
1044 .irq_get = bsd_ring_get_irq,
1045 .irq_put = bsd_ring_put_irq,
1046 .dispatch_execbuffer = ring_dispatch_execbuffer,
1047 };
1048
1049
1050 static void gen6_bsd_ring_write_tail(struct intel_ring_buffer *ring,
1051 u32 value)
1052 {
1053 drm_i915_private_t *dev_priv = ring->dev->dev_private;
1054
1055 /* Every tail move must follow the sequence below */
1056 I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
1057 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
1058 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE);
1059 I915_WRITE(GEN6_BSD_RNCID, 0x0);
1060
1061 if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) &
1062 GEN6_BSD_SLEEP_PSMI_CONTROL_IDLE_INDICATOR) == 0,
1063 50))
1064 DRM_ERROR("timed out waiting for IDLE Indicator\n");
1065
1066 I915_WRITE_TAIL(ring, value);
1067 I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
1068 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
1069 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_ENABLE);
1070 }
1071
1072 static int gen6_ring_flush(struct intel_ring_buffer *ring,
1073 u32 invalidate, u32 flush)
1074 {
1075 uint32_t cmd;
1076 int ret;
1077
1078 ret = intel_ring_begin(ring, 4);
1079 if (ret)
1080 return ret;
1081
1082 cmd = MI_FLUSH_DW;
1083 if (invalidate & I915_GEM_GPU_DOMAINS)
1084 cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD;
1085 intel_ring_emit(ring, cmd);
1086 intel_ring_emit(ring, 0);
1087 intel_ring_emit(ring, 0);
1088 intel_ring_emit(ring, MI_NOOP);
1089 intel_ring_advance(ring);
1090 return 0;
1091 }
1092
1093 static int
1094 gen6_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
1095 u32 offset, u32 len)
1096 {
1097 int ret;
1098
1099 ret = intel_ring_begin(ring, 2);
1100 if (ret)
1101 return ret;
1102
1103 intel_ring_emit(ring, MI_BATCH_BUFFER_START | MI_BATCH_NON_SECURE_I965);
1104 /* bit0-7 is the length on GEN6+ */
1105 intel_ring_emit(ring, offset);
1106 intel_ring_advance(ring);
1107
1108 return 0;
1109 }
1110
1111 static bool
1112 gen6_render_ring_get_irq(struct intel_ring_buffer *ring)
1113 {
1114 return gen6_ring_get_irq(ring,
1115 GT_USER_INTERRUPT,
1116 GEN6_RENDER_USER_INTERRUPT);
1117 }
1118
1119 static void
1120 gen6_render_ring_put_irq(struct intel_ring_buffer *ring)
1121 {
1122 return gen6_ring_put_irq(ring,
1123 GT_USER_INTERRUPT,
1124 GEN6_RENDER_USER_INTERRUPT);
1125 }
1126
1127 static bool
1128 gen6_bsd_ring_get_irq(struct intel_ring_buffer *ring)
1129 {
1130 return gen6_ring_get_irq(ring,
1131 GT_GEN6_BSD_USER_INTERRUPT,
1132 GEN6_BSD_USER_INTERRUPT);
1133 }
1134
1135 static void
1136 gen6_bsd_ring_put_irq(struct intel_ring_buffer *ring)
1137 {
1138 return gen6_ring_put_irq(ring,
1139 GT_GEN6_BSD_USER_INTERRUPT,
1140 GEN6_BSD_USER_INTERRUPT);
1141 }
1142
1143 /* ring buffer for Video Codec for Gen6+ */
1144 static const struct intel_ring_buffer gen6_bsd_ring = {
1145 .name = "gen6 bsd ring",
1146 .id = RING_BSD,
1147 .mmio_base = GEN6_BSD_RING_BASE,
1148 .size = 32 * PAGE_SIZE,
1149 .init = init_ring_common,
1150 .write_tail = gen6_bsd_ring_write_tail,
1151 .flush = gen6_ring_flush,
1152 .add_request = gen6_add_request,
1153 .get_seqno = ring_get_seqno,
1154 .irq_get = gen6_bsd_ring_get_irq,
1155 .irq_put = gen6_bsd_ring_put_irq,
1156 .dispatch_execbuffer = gen6_ring_dispatch_execbuffer,
1157 };
1158
1159 /* Blitter support (SandyBridge+) */
1160
1161 static bool
1162 blt_ring_get_irq(struct intel_ring_buffer *ring)
1163 {
1164 return gen6_ring_get_irq(ring,
1165 GT_BLT_USER_INTERRUPT,
1166 GEN6_BLITTER_USER_INTERRUPT);
1167 }
1168
1169 static void
1170 blt_ring_put_irq(struct intel_ring_buffer *ring)
1171 {
1172 gen6_ring_put_irq(ring,
1173 GT_BLT_USER_INTERRUPT,
1174 GEN6_BLITTER_USER_INTERRUPT);
1175 }
1176
1177
1178 /* Workaround for some stepping of SNB,
1179 * each time when BLT engine ring tail moved,
1180 * the first command in the ring to be parsed
1181 * should be MI_BATCH_BUFFER_START
1182 */
1183 #define NEED_BLT_WORKAROUND(dev) \
1184 (IS_GEN6(dev) && (dev->pdev->revision < 8))
1185
1186 static inline struct drm_i915_gem_object *
1187 to_blt_workaround(struct intel_ring_buffer *ring)
1188 {
1189 return ring->private;
1190 }
1191
1192 static int blt_ring_init(struct intel_ring_buffer *ring)
1193 {
1194 if (NEED_BLT_WORKAROUND(ring->dev)) {
1195 struct drm_i915_gem_object *obj;
1196 u32 *ptr;
1197 int ret;
1198
1199 obj = i915_gem_alloc_object(ring->dev, 4096);
1200 if (obj == NULL)
1201 return -ENOMEM;
1202
1203 ret = i915_gem_object_pin(obj, 4096, true);
1204 if (ret) {
1205 drm_gem_object_unreference(&obj->base);
1206 return ret;
1207 }
1208
1209 ptr = kmap(obj->pages[0]);
1210 *ptr++ = MI_BATCH_BUFFER_END;
1211 *ptr++ = MI_NOOP;
1212 kunmap(obj->pages[0]);
1213
1214 ret = i915_gem_object_set_to_gtt_domain(obj, false);
1215 if (ret) {
1216 i915_gem_object_unpin(obj);
1217 drm_gem_object_unreference(&obj->base);
1218 return ret;
1219 }
1220
1221 ring->private = obj;
1222 }
1223
1224 return init_ring_common(ring);
1225 }
1226
1227 static int blt_ring_begin(struct intel_ring_buffer *ring,
1228 int num_dwords)
1229 {
1230 if (ring->private) {
1231 int ret = intel_ring_begin(ring, num_dwords+2);
1232 if (ret)
1233 return ret;
1234
1235 intel_ring_emit(ring, MI_BATCH_BUFFER_START);
1236 intel_ring_emit(ring, to_blt_workaround(ring)->gtt_offset);
1237
1238 return 0;
1239 } else
1240 return intel_ring_begin(ring, 4);
1241 }
1242
1243 static int blt_ring_flush(struct intel_ring_buffer *ring,
1244 u32 invalidate, u32 flush)
1245 {
1246 uint32_t cmd;
1247 int ret;
1248
1249 ret = blt_ring_begin(ring, 4);
1250 if (ret)
1251 return ret;
1252
1253 cmd = MI_FLUSH_DW;
1254 if (invalidate & I915_GEM_DOMAIN_RENDER)
1255 cmd |= MI_INVALIDATE_TLB;
1256 intel_ring_emit(ring, cmd);
1257 intel_ring_emit(ring, 0);
1258 intel_ring_emit(ring, 0);
1259 intel_ring_emit(ring, MI_NOOP);
1260 intel_ring_advance(ring);
1261 return 0;
1262 }
1263
1264 static void blt_ring_cleanup(struct intel_ring_buffer *ring)
1265 {
1266 if (!ring->private)
1267 return;
1268
1269 i915_gem_object_unpin(ring->private);
1270 drm_gem_object_unreference(ring->private);
1271 ring->private = NULL;
1272 }
1273
1274 static const struct intel_ring_buffer gen6_blt_ring = {
1275 .name = "blt ring",
1276 .id = RING_BLT,
1277 .mmio_base = BLT_RING_BASE,
1278 .size = 32 * PAGE_SIZE,
1279 .init = blt_ring_init,
1280 .write_tail = ring_write_tail,
1281 .flush = blt_ring_flush,
1282 .add_request = gen6_add_request,
1283 .get_seqno = ring_get_seqno,
1284 .irq_get = blt_ring_get_irq,
1285 .irq_put = blt_ring_put_irq,
1286 .dispatch_execbuffer = gen6_ring_dispatch_execbuffer,
1287 .cleanup = blt_ring_cleanup,
1288 };
1289
1290 int intel_init_render_ring_buffer(struct drm_device *dev)
1291 {
1292 drm_i915_private_t *dev_priv = dev->dev_private;
1293 struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
1294
1295 *ring = render_ring;
1296 if (INTEL_INFO(dev)->gen >= 6) {
1297 ring->add_request = gen6_add_request;
1298 ring->irq_get = gen6_render_ring_get_irq;
1299 ring->irq_put = gen6_render_ring_put_irq;
1300 } else if (IS_GEN5(dev)) {
1301 ring->add_request = pc_render_add_request;
1302 ring->get_seqno = pc_render_get_seqno;
1303 }
1304
1305 if (!I915_NEED_GFX_HWS(dev)) {
1306 ring->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
1307 memset(ring->status_page.page_addr, 0, PAGE_SIZE);
1308 }
1309
1310 return intel_init_ring_buffer(dev, ring);
1311 }
1312
1313 int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size)
1314 {
1315 drm_i915_private_t *dev_priv = dev->dev_private;
1316 struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
1317
1318 *ring = render_ring;
1319 if (INTEL_INFO(dev)->gen >= 6) {
1320 ring->add_request = gen6_add_request;
1321 ring->irq_get = gen6_render_ring_get_irq;
1322 ring->irq_put = gen6_render_ring_put_irq;
1323 } else if (IS_GEN5(dev)) {
1324 ring->add_request = pc_render_add_request;
1325 ring->get_seqno = pc_render_get_seqno;
1326 }
1327
1328 if (!I915_NEED_GFX_HWS(dev))
1329 ring->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
1330
1331 ring->dev = dev;
1332 INIT_LIST_HEAD(&ring->active_list);
1333 INIT_LIST_HEAD(&ring->request_list);
1334 INIT_LIST_HEAD(&ring->gpu_write_list);
1335
1336 ring->size = size;
1337 ring->effective_size = ring->size;
1338 if (IS_I830(ring->dev))
1339 ring->effective_size -= 128;
1340
1341 ring->map.offset = start;
1342 ring->map.size = size;
1343 ring->map.type = 0;
1344 ring->map.flags = 0;
1345 ring->map.mtrr = 0;
1346
1347 drm_core_ioremap_wc(&ring->map, dev);
1348 if (ring->map.handle == NULL) {
1349 DRM_ERROR("can not ioremap virtual address for"
1350 " ring buffer\n");
1351 return -ENOMEM;
1352 }
1353
1354 ring->virtual_start = (void __force __iomem *)ring->map.handle;
1355 return 0;
1356 }
1357
1358 int intel_init_bsd_ring_buffer(struct drm_device *dev)
1359 {
1360 drm_i915_private_t *dev_priv = dev->dev_private;
1361 struct intel_ring_buffer *ring = &dev_priv->ring[VCS];
1362
1363 if (IS_GEN6(dev) || IS_GEN7(dev))
1364 *ring = gen6_bsd_ring;
1365 else
1366 *ring = bsd_ring;
1367
1368 return intel_init_ring_buffer(dev, ring);
1369 }
1370
1371 int intel_init_blt_ring_buffer(struct drm_device *dev)
1372 {
1373 drm_i915_private_t *dev_priv = dev->dev_private;
1374 struct intel_ring_buffer *ring = &dev_priv->ring[BCS];
1375
1376 *ring = gen6_blt_ring;
1377
1378 return intel_init_ring_buffer(dev, ring);
1379 }
Linux kernel - Deliverables
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