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drm/ttm: Fix two race conditions + fix busy codepaths
[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
36 static u32 i915_gem_get_seqno(struct drm_device *dev)
37 {
38 drm_i915_private_t *dev_priv = dev->dev_private;
39 u32 seqno;
40
41 seqno = dev_priv->next_seqno;
42
43 /* reserve 0 for non-seqno */
44 if (++dev_priv->next_seqno == 0)
45 dev_priv->next_seqno = 1;
46
47 return seqno;
48 }
49
50 static void
51 render_ring_flush(struct drm_device *dev,
52 struct intel_ring_buffer *ring,
53 u32 invalidate_domains,
54 u32 flush_domains)
55 {
56 drm_i915_private_t *dev_priv = dev->dev_private;
57 u32 cmd;
58
59 #if WATCH_EXEC
60 DRM_INFO("%s: invalidate %08x flush %08x\n", __func__,
61 invalidate_domains, flush_domains);
62 #endif
63
64 trace_i915_gem_request_flush(dev, dev_priv->next_seqno,
65 invalidate_domains, flush_domains);
66
67 if ((invalidate_domains | flush_domains) & I915_GEM_GPU_DOMAINS) {
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 (!IS_I965G(dev)) {
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 WATCH_EXEC
112 DRM_INFO("%s: queue flush %08x to ring\n", __func__, cmd);
113 #endif
114 intel_ring_begin(dev, ring, 2);
115 intel_ring_emit(dev, ring, cmd);
116 intel_ring_emit(dev, ring, MI_NOOP);
117 intel_ring_advance(dev, ring);
118 }
119 }
120
121 static unsigned int render_ring_get_head(struct drm_device *dev,
122 struct intel_ring_buffer *ring)
123 {
124 drm_i915_private_t *dev_priv = dev->dev_private;
125 return I915_READ(PRB0_HEAD) & HEAD_ADDR;
126 }
127
128 static unsigned int render_ring_get_tail(struct drm_device *dev,
129 struct intel_ring_buffer *ring)
130 {
131 drm_i915_private_t *dev_priv = dev->dev_private;
132 return I915_READ(PRB0_TAIL) & TAIL_ADDR;
133 }
134
135 static unsigned int render_ring_get_active_head(struct drm_device *dev,
136 struct intel_ring_buffer *ring)
137 {
138 drm_i915_private_t *dev_priv = dev->dev_private;
139 u32 acthd_reg = IS_I965G(dev) ? ACTHD_I965 : ACTHD;
140
141 return I915_READ(acthd_reg);
142 }
143
144 static void render_ring_advance_ring(struct drm_device *dev,
145 struct intel_ring_buffer *ring)
146 {
147 drm_i915_private_t *dev_priv = dev->dev_private;
148 I915_WRITE(PRB0_TAIL, ring->tail);
149 }
150
151 static int init_ring_common(struct drm_device *dev,
152 struct intel_ring_buffer *ring)
153 {
154 u32 head;
155 drm_i915_private_t *dev_priv = dev->dev_private;
156 struct drm_i915_gem_object *obj_priv;
157 obj_priv = to_intel_bo(ring->gem_object);
158
159 /* Stop the ring if it's running. */
160 I915_WRITE(ring->regs.ctl, 0);
161 I915_WRITE(ring->regs.head, 0);
162 I915_WRITE(ring->regs.tail, 0);
163
164 /* Initialize the ring. */
165 I915_WRITE(ring->regs.start, obj_priv->gtt_offset);
166 head = ring->get_head(dev, ring);
167
168 /* G45 ring initialization fails to reset head to zero */
169 if (head != 0) {
170 DRM_ERROR("%s head not reset to zero "
171 "ctl %08x head %08x tail %08x start %08x\n",
172 ring->name,
173 I915_READ(ring->regs.ctl),
174 I915_READ(ring->regs.head),
175 I915_READ(ring->regs.tail),
176 I915_READ(ring->regs.start));
177
178 I915_WRITE(ring->regs.head, 0);
179
180 DRM_ERROR("%s head forced to zero "
181 "ctl %08x head %08x tail %08x start %08x\n",
182 ring->name,
183 I915_READ(ring->regs.ctl),
184 I915_READ(ring->regs.head),
185 I915_READ(ring->regs.tail),
186 I915_READ(ring->regs.start));
187 }
188
189 I915_WRITE(ring->regs.ctl,
190 ((ring->gem_object->size - PAGE_SIZE) & RING_NR_PAGES)
191 | RING_NO_REPORT | RING_VALID);
192
193 head = I915_READ(ring->regs.head) & HEAD_ADDR;
194 /* If the head is still not zero, the ring is dead */
195 if (head != 0) {
196 DRM_ERROR("%s initialization failed "
197 "ctl %08x head %08x tail %08x start %08x\n",
198 ring->name,
199 I915_READ(ring->regs.ctl),
200 I915_READ(ring->regs.head),
201 I915_READ(ring->regs.tail),
202 I915_READ(ring->regs.start));
203 return -EIO;
204 }
205
206 if (!drm_core_check_feature(dev, DRIVER_MODESET))
207 i915_kernel_lost_context(dev);
208 else {
209 ring->head = ring->get_head(dev, ring);
210 ring->tail = ring->get_tail(dev, ring);
211 ring->space = ring->head - (ring->tail + 8);
212 if (ring->space < 0)
213 ring->space += ring->size;
214 }
215 return 0;
216 }
217
218 static int init_render_ring(struct drm_device *dev,
219 struct intel_ring_buffer *ring)
220 {
221 drm_i915_private_t *dev_priv = dev->dev_private;
222 int ret = init_ring_common(dev, ring);
223 int mode;
224
225 if (IS_I9XX(dev) && !IS_GEN3(dev)) {
226 mode = VS_TIMER_DISPATCH << 16 | VS_TIMER_DISPATCH;
227 if (IS_GEN6(dev))
228 mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;
229 I915_WRITE(MI_MODE, mode);
230 }
231 return ret;
232 }
233
234 #define PIPE_CONTROL_FLUSH(addr) \
235 do { \
236 OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | \
237 PIPE_CONTROL_DEPTH_STALL | 2); \
238 OUT_RING(addr | PIPE_CONTROL_GLOBAL_GTT); \
239 OUT_RING(0); \
240 OUT_RING(0); \
241 } while (0)
242
243 /**
244 * Creates a new sequence number, emitting a write of it to the status page
245 * plus an interrupt, which will trigger i915_user_interrupt_handler.
246 *
247 * Must be called with struct_lock held.
248 *
249 * Returned sequence numbers are nonzero on success.
250 */
251 static u32
252 render_ring_add_request(struct drm_device *dev,
253 struct intel_ring_buffer *ring,
254 struct drm_file *file_priv,
255 u32 flush_domains)
256 {
257 drm_i915_private_t *dev_priv = dev->dev_private;
258 u32 seqno;
259
260 seqno = i915_gem_get_seqno(dev);
261
262 if (IS_GEN6(dev)) {
263 BEGIN_LP_RING(6);
264 OUT_RING(GFX_OP_PIPE_CONTROL | 3);
265 OUT_RING(PIPE_CONTROL_QW_WRITE |
266 PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_IS_FLUSH |
267 PIPE_CONTROL_NOTIFY);
268 OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT);
269 OUT_RING(seqno);
270 OUT_RING(0);
271 OUT_RING(0);
272 ADVANCE_LP_RING();
273 } else if (HAS_PIPE_CONTROL(dev)) {
274 u32 scratch_addr = dev_priv->seqno_gfx_addr + 128;
275
276 /*
277 * Workaround qword write incoherence by flushing the
278 * PIPE_NOTIFY buffers out to memory before requesting
279 * an interrupt.
280 */
281 BEGIN_LP_RING(32);
282 OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
283 PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH);
284 OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT);
285 OUT_RING(seqno);
286 OUT_RING(0);
287 PIPE_CONTROL_FLUSH(scratch_addr);
288 scratch_addr += 128; /* write to separate cachelines */
289 PIPE_CONTROL_FLUSH(scratch_addr);
290 scratch_addr += 128;
291 PIPE_CONTROL_FLUSH(scratch_addr);
292 scratch_addr += 128;
293 PIPE_CONTROL_FLUSH(scratch_addr);
294 scratch_addr += 128;
295 PIPE_CONTROL_FLUSH(scratch_addr);
296 scratch_addr += 128;
297 PIPE_CONTROL_FLUSH(scratch_addr);
298 OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE |
299 PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH |
300 PIPE_CONTROL_NOTIFY);
301 OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT);
302 OUT_RING(seqno);
303 OUT_RING(0);
304 ADVANCE_LP_RING();
305 } else {
306 BEGIN_LP_RING(4);
307 OUT_RING(MI_STORE_DWORD_INDEX);
308 OUT_RING(I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
309 OUT_RING(seqno);
310
311 OUT_RING(MI_USER_INTERRUPT);
312 ADVANCE_LP_RING();
313 }
314 return seqno;
315 }
316
317 static u32
318 render_ring_get_gem_seqno(struct drm_device *dev,
319 struct intel_ring_buffer *ring)
320 {
321 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
322 if (HAS_PIPE_CONTROL(dev))
323 return ((volatile u32 *)(dev_priv->seqno_page))[0];
324 else
325 return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
326 }
327
328 static void
329 render_ring_get_user_irq(struct drm_device *dev,
330 struct intel_ring_buffer *ring)
331 {
332 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
333 unsigned long irqflags;
334
335 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
336 if (dev->irq_enabled && (++ring->user_irq_refcount == 1)) {
337 if (HAS_PCH_SPLIT(dev))
338 ironlake_enable_graphics_irq(dev_priv, GT_PIPE_NOTIFY);
339 else
340 i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
341 }
342 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
343 }
344
345 static void
346 render_ring_put_user_irq(struct drm_device *dev,
347 struct intel_ring_buffer *ring)
348 {
349 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
350 unsigned long irqflags;
351
352 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
353 BUG_ON(dev->irq_enabled && ring->user_irq_refcount <= 0);
354 if (dev->irq_enabled && (--ring->user_irq_refcount == 0)) {
355 if (HAS_PCH_SPLIT(dev))
356 ironlake_disable_graphics_irq(dev_priv, GT_PIPE_NOTIFY);
357 else
358 i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
359 }
360 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
361 }
362
363 static void render_setup_status_page(struct drm_device *dev,
364 struct intel_ring_buffer *ring)
365 {
366 drm_i915_private_t *dev_priv = dev->dev_private;
367 if (IS_GEN6(dev)) {
368 I915_WRITE(HWS_PGA_GEN6, ring->status_page.gfx_addr);
369 I915_READ(HWS_PGA_GEN6); /* posting read */
370 } else {
371 I915_WRITE(HWS_PGA, ring->status_page.gfx_addr);
372 I915_READ(HWS_PGA); /* posting read */
373 }
374
375 }
376
377 void
378 bsd_ring_flush(struct drm_device *dev,
379 struct intel_ring_buffer *ring,
380 u32 invalidate_domains,
381 u32 flush_domains)
382 {
383 intel_ring_begin(dev, ring, 2);
384 intel_ring_emit(dev, ring, MI_FLUSH);
385 intel_ring_emit(dev, ring, MI_NOOP);
386 intel_ring_advance(dev, ring);
387 }
388
389 static inline unsigned int bsd_ring_get_head(struct drm_device *dev,
390 struct intel_ring_buffer *ring)
391 {
392 drm_i915_private_t *dev_priv = dev->dev_private;
393 return I915_READ(BSD_RING_HEAD) & HEAD_ADDR;
394 }
395
396 static inline unsigned int bsd_ring_get_tail(struct drm_device *dev,
397 struct intel_ring_buffer *ring)
398 {
399 drm_i915_private_t *dev_priv = dev->dev_private;
400 return I915_READ(BSD_RING_TAIL) & TAIL_ADDR;
401 }
402
403 static inline unsigned int bsd_ring_get_active_head(struct drm_device *dev,
404 struct intel_ring_buffer *ring)
405 {
406 drm_i915_private_t *dev_priv = dev->dev_private;
407 return I915_READ(BSD_RING_ACTHD);
408 }
409
410 static inline void bsd_ring_advance_ring(struct drm_device *dev,
411 struct intel_ring_buffer *ring)
412 {
413 drm_i915_private_t *dev_priv = dev->dev_private;
414 I915_WRITE(BSD_RING_TAIL, ring->tail);
415 }
416
417 static int init_bsd_ring(struct drm_device *dev,
418 struct intel_ring_buffer *ring)
419 {
420 return init_ring_common(dev, ring);
421 }
422
423 static u32
424 bsd_ring_add_request(struct drm_device *dev,
425 struct intel_ring_buffer *ring,
426 struct drm_file *file_priv,
427 u32 flush_domains)
428 {
429 u32 seqno;
430
431 seqno = i915_gem_get_seqno(dev);
432
433 intel_ring_begin(dev, ring, 4);
434 intel_ring_emit(dev, ring, MI_STORE_DWORD_INDEX);
435 intel_ring_emit(dev, ring,
436 I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
437 intel_ring_emit(dev, ring, seqno);
438 intel_ring_emit(dev, ring, MI_USER_INTERRUPT);
439 intel_ring_advance(dev, ring);
440
441 DRM_DEBUG_DRIVER("%s %d\n", ring->name, seqno);
442
443 return seqno;
444 }
445
446 static void bsd_setup_status_page(struct drm_device *dev,
447 struct intel_ring_buffer *ring)
448 {
449 drm_i915_private_t *dev_priv = dev->dev_private;
450 I915_WRITE(BSD_HWS_PGA, ring->status_page.gfx_addr);
451 I915_READ(BSD_HWS_PGA);
452 }
453
454 static void
455 bsd_ring_get_user_irq(struct drm_device *dev,
456 struct intel_ring_buffer *ring)
457 {
458 /* do nothing */
459 }
460 static void
461 bsd_ring_put_user_irq(struct drm_device *dev,
462 struct intel_ring_buffer *ring)
463 {
464 /* do nothing */
465 }
466
467 static u32
468 bsd_ring_get_gem_seqno(struct drm_device *dev,
469 struct intel_ring_buffer *ring)
470 {
471 return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
472 }
473
474 static int
475 bsd_ring_dispatch_gem_execbuffer(struct drm_device *dev,
476 struct intel_ring_buffer *ring,
477 struct drm_i915_gem_execbuffer2 *exec,
478 struct drm_clip_rect *cliprects,
479 uint64_t exec_offset)
480 {
481 uint32_t exec_start;
482 exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
483 intel_ring_begin(dev, ring, 2);
484 intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START |
485 (2 << 6) | MI_BATCH_NON_SECURE_I965);
486 intel_ring_emit(dev, ring, exec_start);
487 intel_ring_advance(dev, ring);
488 return 0;
489 }
490
491
492 static int
493 render_ring_dispatch_gem_execbuffer(struct drm_device *dev,
494 struct intel_ring_buffer *ring,
495 struct drm_i915_gem_execbuffer2 *exec,
496 struct drm_clip_rect *cliprects,
497 uint64_t exec_offset)
498 {
499 drm_i915_private_t *dev_priv = dev->dev_private;
500 int nbox = exec->num_cliprects;
501 int i = 0, count;
502 uint32_t exec_start, exec_len;
503 exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
504 exec_len = (uint32_t) exec->batch_len;
505
506 trace_i915_gem_request_submit(dev, dev_priv->next_seqno + 1);
507
508 count = nbox ? nbox : 1;
509
510 for (i = 0; i < count; i++) {
511 if (i < nbox) {
512 int ret = i915_emit_box(dev, cliprects, i,
513 exec->DR1, exec->DR4);
514 if (ret)
515 return ret;
516 }
517
518 if (IS_I830(dev) || IS_845G(dev)) {
519 intel_ring_begin(dev, ring, 4);
520 intel_ring_emit(dev, ring, MI_BATCH_BUFFER);
521 intel_ring_emit(dev, ring,
522 exec_start | MI_BATCH_NON_SECURE);
523 intel_ring_emit(dev, ring, exec_start + exec_len - 4);
524 intel_ring_emit(dev, ring, 0);
525 } else {
526 intel_ring_begin(dev, ring, 4);
527 if (IS_I965G(dev)) {
528 intel_ring_emit(dev, ring,
529 MI_BATCH_BUFFER_START | (2 << 6)
530 | MI_BATCH_NON_SECURE_I965);
531 intel_ring_emit(dev, ring, exec_start);
532 } else {
533 intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START
534 | (2 << 6));
535 intel_ring_emit(dev, ring, exec_start |
536 MI_BATCH_NON_SECURE);
537 }
538 }
539 intel_ring_advance(dev, ring);
540 }
541
542 if (IS_G4X(dev) || IS_IRONLAKE(dev)) {
543 intel_ring_begin(dev, ring, 2);
544 intel_ring_emit(dev, ring, MI_FLUSH |
545 MI_NO_WRITE_FLUSH |
546 MI_INVALIDATE_ISP );
547 intel_ring_emit(dev, ring, MI_NOOP);
548 intel_ring_advance(dev, ring);
549 }
550 /* XXX breadcrumb */
551
552 return 0;
553 }
554
555 static void cleanup_status_page(struct drm_device *dev,
556 struct intel_ring_buffer *ring)
557 {
558 drm_i915_private_t *dev_priv = dev->dev_private;
559 struct drm_gem_object *obj;
560 struct drm_i915_gem_object *obj_priv;
561
562 obj = ring->status_page.obj;
563 if (obj == NULL)
564 return;
565 obj_priv = to_intel_bo(obj);
566
567 kunmap(obj_priv->pages[0]);
568 i915_gem_object_unpin(obj);
569 drm_gem_object_unreference(obj);
570 ring->status_page.obj = NULL;
571
572 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
573 }
574
575 static int init_status_page(struct drm_device *dev,
576 struct intel_ring_buffer *ring)
577 {
578 drm_i915_private_t *dev_priv = dev->dev_private;
579 struct drm_gem_object *obj;
580 struct drm_i915_gem_object *obj_priv;
581 int ret;
582
583 obj = i915_gem_alloc_object(dev, 4096);
584 if (obj == NULL) {
585 DRM_ERROR("Failed to allocate status page\n");
586 ret = -ENOMEM;
587 goto err;
588 }
589 obj_priv = to_intel_bo(obj);
590 obj_priv->agp_type = AGP_USER_CACHED_MEMORY;
591
592 ret = i915_gem_object_pin(obj, 4096);
593 if (ret != 0) {
594 goto err_unref;
595 }
596
597 ring->status_page.gfx_addr = obj_priv->gtt_offset;
598 ring->status_page.page_addr = kmap(obj_priv->pages[0]);
599 if (ring->status_page.page_addr == NULL) {
600 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
601 goto err_unpin;
602 }
603 ring->status_page.obj = obj;
604 memset(ring->status_page.page_addr, 0, PAGE_SIZE);
605
606 ring->setup_status_page(dev, ring);
607 DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
608 ring->name, ring->status_page.gfx_addr);
609
610 return 0;
611
612 err_unpin:
613 i915_gem_object_unpin(obj);
614 err_unref:
615 drm_gem_object_unreference(obj);
616 err:
617 return ret;
618 }
619
620
621 int intel_init_ring_buffer(struct drm_device *dev,
622 struct intel_ring_buffer *ring)
623 {
624 struct drm_i915_gem_object *obj_priv;
625 struct drm_gem_object *obj;
626 int ret;
627
628 ring->dev = dev;
629
630 if (I915_NEED_GFX_HWS(dev)) {
631 ret = init_status_page(dev, ring);
632 if (ret)
633 return ret;
634 }
635
636 obj = i915_gem_alloc_object(dev, ring->size);
637 if (obj == NULL) {
638 DRM_ERROR("Failed to allocate ringbuffer\n");
639 ret = -ENOMEM;
640 goto err_hws;
641 }
642
643 ring->gem_object = obj;
644
645 ret = i915_gem_object_pin(obj, ring->alignment);
646 if (ret)
647 goto err_unref;
648
649 obj_priv = to_intel_bo(obj);
650 ring->map.size = ring->size;
651 ring->map.offset = dev->agp->base + obj_priv->gtt_offset;
652 ring->map.type = 0;
653 ring->map.flags = 0;
654 ring->map.mtrr = 0;
655
656 drm_core_ioremap_wc(&ring->map, dev);
657 if (ring->map.handle == NULL) {
658 DRM_ERROR("Failed to map ringbuffer.\n");
659 ret = -EINVAL;
660 goto err_unpin;
661 }
662
663 ring->virtual_start = ring->map.handle;
664 ret = ring->init(dev, ring);
665 if (ret)
666 goto err_unmap;
667
668 if (!drm_core_check_feature(dev, DRIVER_MODESET))
669 i915_kernel_lost_context(dev);
670 else {
671 ring->head = ring->get_head(dev, ring);
672 ring->tail = ring->get_tail(dev, ring);
673 ring->space = ring->head - (ring->tail + 8);
674 if (ring->space < 0)
675 ring->space += ring->size;
676 }
677 INIT_LIST_HEAD(&ring->active_list);
678 INIT_LIST_HEAD(&ring->request_list);
679 return ret;
680
681 err_unmap:
682 drm_core_ioremapfree(&ring->map, dev);
683 err_unpin:
684 i915_gem_object_unpin(obj);
685 err_unref:
686 drm_gem_object_unreference(obj);
687 ring->gem_object = NULL;
688 err_hws:
689 cleanup_status_page(dev, ring);
690 return ret;
691 }
692
693 void intel_cleanup_ring_buffer(struct drm_device *dev,
694 struct intel_ring_buffer *ring)
695 {
696 if (ring->gem_object == NULL)
697 return;
698
699 drm_core_ioremapfree(&ring->map, dev);
700
701 i915_gem_object_unpin(ring->gem_object);
702 drm_gem_object_unreference(ring->gem_object);
703 ring->gem_object = NULL;
704 cleanup_status_page(dev, ring);
705 }
706
707 int intel_wrap_ring_buffer(struct drm_device *dev,
708 struct intel_ring_buffer *ring)
709 {
710 unsigned int *virt;
711 int rem;
712 rem = ring->size - ring->tail;
713
714 if (ring->space < rem) {
715 int ret = intel_wait_ring_buffer(dev, ring, rem);
716 if (ret)
717 return ret;
718 }
719
720 virt = (unsigned int *)(ring->virtual_start + ring->tail);
721 rem /= 8;
722 while (rem--) {
723 *virt++ = MI_NOOP;
724 *virt++ = MI_NOOP;
725 }
726
727 ring->tail = 0;
728 ring->space = ring->head - 8;
729
730 return 0;
731 }
732
733 int intel_wait_ring_buffer(struct drm_device *dev,
734 struct intel_ring_buffer *ring, int n)
735 {
736 unsigned long end;
737
738 trace_i915_ring_wait_begin (dev);
739 end = jiffies + 3 * HZ;
740 do {
741 ring->head = ring->get_head(dev, ring);
742 ring->space = ring->head - (ring->tail + 8);
743 if (ring->space < 0)
744 ring->space += ring->size;
745 if (ring->space >= n) {
746 trace_i915_ring_wait_end (dev);
747 return 0;
748 }
749
750 if (dev->primary->master) {
751 struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
752 if (master_priv->sarea_priv)
753 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
754 }
755
756 yield();
757 } while (!time_after(jiffies, end));
758 trace_i915_ring_wait_end (dev);
759 return -EBUSY;
760 }
761
762 void intel_ring_begin(struct drm_device *dev,
763 struct intel_ring_buffer *ring, int num_dwords)
764 {
765 int n = 4*num_dwords;
766 if (unlikely(ring->tail + n > ring->size))
767 intel_wrap_ring_buffer(dev, ring);
768 if (unlikely(ring->space < n))
769 intel_wait_ring_buffer(dev, ring, n);
770
771 ring->space -= n;
772 }
773
774 void intel_ring_advance(struct drm_device *dev,
775 struct intel_ring_buffer *ring)
776 {
777 ring->tail &= ring->size - 1;
778 ring->advance_ring(dev, ring);
779 }
780
781 void intel_fill_struct(struct drm_device *dev,
782 struct intel_ring_buffer *ring,
783 void *data,
784 unsigned int len)
785 {
786 unsigned int *virt = ring->virtual_start + ring->tail;
787 BUG_ON((len&~(4-1)) != 0);
788 intel_ring_begin(dev, ring, len/4);
789 memcpy(virt, data, len);
790 ring->tail += len;
791 ring->tail &= ring->size - 1;
792 ring->space -= len;
793 intel_ring_advance(dev, ring);
794 }
795
796 struct intel_ring_buffer render_ring = {
797 .name = "render ring",
798 .regs = {
799 .ctl = PRB0_CTL,
800 .head = PRB0_HEAD,
801 .tail = PRB0_TAIL,
802 .start = PRB0_START
803 },
804 .ring_flag = I915_EXEC_RENDER,
805 .size = 32 * PAGE_SIZE,
806 .alignment = PAGE_SIZE,
807 .virtual_start = NULL,
808 .dev = NULL,
809 .gem_object = NULL,
810 .head = 0,
811 .tail = 0,
812 .space = 0,
813 .user_irq_refcount = 0,
814 .irq_gem_seqno = 0,
815 .waiting_gem_seqno = 0,
816 .setup_status_page = render_setup_status_page,
817 .init = init_render_ring,
818 .get_head = render_ring_get_head,
819 .get_tail = render_ring_get_tail,
820 .get_active_head = render_ring_get_active_head,
821 .advance_ring = render_ring_advance_ring,
822 .flush = render_ring_flush,
823 .add_request = render_ring_add_request,
824 .get_gem_seqno = render_ring_get_gem_seqno,
825 .user_irq_get = render_ring_get_user_irq,
826 .user_irq_put = render_ring_put_user_irq,
827 .dispatch_gem_execbuffer = render_ring_dispatch_gem_execbuffer,
828 .status_page = {NULL, 0, NULL},
829 .map = {0,}
830 };
831
832 /* ring buffer for bit-stream decoder */
833
834 struct intel_ring_buffer bsd_ring = {
835 .name = "bsd ring",
836 .regs = {
837 .ctl = BSD_RING_CTL,
838 .head = BSD_RING_HEAD,
839 .tail = BSD_RING_TAIL,
840 .start = BSD_RING_START
841 },
842 .ring_flag = I915_EXEC_BSD,
843 .size = 32 * PAGE_SIZE,
844 .alignment = PAGE_SIZE,
845 .virtual_start = NULL,
846 .dev = NULL,
847 .gem_object = NULL,
848 .head = 0,
849 .tail = 0,
850 .space = 0,
851 .user_irq_refcount = 0,
852 .irq_gem_seqno = 0,
853 .waiting_gem_seqno = 0,
854 .setup_status_page = bsd_setup_status_page,
855 .init = init_bsd_ring,
856 .get_head = bsd_ring_get_head,
857 .get_tail = bsd_ring_get_tail,
858 .get_active_head = bsd_ring_get_active_head,
859 .advance_ring = bsd_ring_advance_ring,
860 .flush = bsd_ring_flush,
861 .add_request = bsd_ring_add_request,
862 .get_gem_seqno = bsd_ring_get_gem_seqno,
863 .user_irq_get = bsd_ring_get_user_irq,
864 .user_irq_put = bsd_ring_put_user_irq,
865 .dispatch_gem_execbuffer = bsd_ring_dispatch_gem_execbuffer,
866 .status_page = {NULL, 0, NULL},
867 .map = {0,}
868 };
Linux kernel - Deliverables
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