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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_drm.h" | |
33 | #include "i915_drv.h" | |
34 | #include "i915_trace.h" | |
35 | #include "intel_drv.h" | |
36 | ||
37 | void | |
38 | i915_gem_flush(struct drm_device *dev, | |
39 | uint32_t invalidate_domains, | |
40 | uint32_t flush_domains) | |
41 | { | |
42 | drm_i915_private_t *dev_priv = dev->dev_private; | |
43 | uint32_t cmd; | |
44 | RING_LOCALS; | |
45 | ||
46 | #if WATCH_EXEC | |
47 | DRM_INFO("%s: invalidate %08x flush %08x\n", __func__, | |
48 | invalidate_domains, flush_domains); | |
49 | #endif | |
50 | trace_i915_gem_request_flush(dev, dev_priv->mm.next_gem_seqno, | |
51 | invalidate_domains, flush_domains); | |
52 | ||
53 | if (flush_domains & I915_GEM_DOMAIN_CPU) | |
54 | drm_agp_chipset_flush(dev); | |
55 | ||
56 | if ((invalidate_domains | flush_domains) & I915_GEM_GPU_DOMAINS) { | |
57 | /* | |
58 | * read/write caches: | |
59 | * | |
60 | * I915_GEM_DOMAIN_RENDER is always invalidated, but is | |
61 | * only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is | |
62 | * also flushed at 2d versus 3d pipeline switches. | |
63 | * | |
64 | * read-only caches: | |
65 | * | |
66 | * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if | |
67 | * MI_READ_FLUSH is set, and is always flushed on 965. | |
68 | * | |
69 | * I915_GEM_DOMAIN_COMMAND may not exist? | |
70 | * | |
71 | * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is | |
72 | * invalidated when MI_EXE_FLUSH is set. | |
73 | * | |
74 | * I915_GEM_DOMAIN_VERTEX, which exists on 965, is | |
75 | * invalidated with every MI_FLUSH. | |
76 | * | |
77 | * TLBs: | |
78 | * | |
79 | * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND | |
80 | * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and | |
81 | * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER | |
82 | * are flushed at any MI_FLUSH. | |
83 | */ | |
84 | ||
85 | cmd = MI_FLUSH | MI_NO_WRITE_FLUSH; | |
86 | if ((invalidate_domains|flush_domains) & | |
87 | I915_GEM_DOMAIN_RENDER) | |
88 | cmd &= ~MI_NO_WRITE_FLUSH; | |
89 | if (!IS_I965G(dev)) { | |
90 | /* | |
91 | * On the 965, the sampler cache always gets flushed | |
92 | * and this bit is reserved. | |
93 | */ | |
94 | if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER) | |
95 | cmd |= MI_READ_FLUSH; | |
96 | } | |
97 | if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION) | |
98 | cmd |= MI_EXE_FLUSH; | |
99 | ||
100 | #if WATCH_EXEC | |
101 | DRM_INFO("%s: queue flush %08x to ring\n", __func__, cmd); | |
102 | #endif | |
103 | BEGIN_LP_RING(2); | |
104 | OUT_RING(cmd); | |
105 | OUT_RING(MI_NOOP); | |
106 | ADVANCE_LP_RING(); | |
107 | } | |
108 | ||
109 | } | |
110 | #define PIPE_CONTROL_FLUSH(addr) \ | |
111 | OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | \ | |
112 | PIPE_CONTROL_DEPTH_STALL); \ | |
113 | OUT_RING(addr | PIPE_CONTROL_GLOBAL_GTT); \ | |
114 | OUT_RING(0); \ | |
115 | OUT_RING(0); \ | |
116 | ||
117 | /** | |
118 | * Creates a new sequence number, emitting a write of it to the status page | |
119 | * plus an interrupt, which will trigger i915_user_interrupt_handler. | |
120 | * | |
121 | * Must be called with struct_lock held. | |
122 | * | |
123 | * Returned sequence numbers are nonzero on success. | |
124 | */ | |
125 | uint32_t | |
126 | i915_ring_add_request(struct drm_device *dev) | |
127 | { | |
128 | drm_i915_private_t *dev_priv = dev->dev_private; | |
129 | uint32_t seqno; | |
130 | RING_LOCALS; | |
131 | ||
132 | /* Grab the seqno we're going to make this request be, and bump the | |
133 | * next (skipping 0 so it can be the reserved no-seqno value). | |
134 | */ | |
135 | seqno = dev_priv->mm.next_gem_seqno; | |
136 | dev_priv->mm.next_gem_seqno++; | |
137 | if (dev_priv->mm.next_gem_seqno == 0) | |
138 | dev_priv->mm.next_gem_seqno++; | |
139 | ||
140 | if (HAS_PIPE_CONTROL(dev)) { | |
141 | u32 scratch_addr = dev_priv->seqno_gfx_addr + 128; | |
142 | ||
143 | /* | |
144 | * Workaround qword write incoherence by flushing the | |
145 | * PIPE_NOTIFY buffers out to memory before requesting | |
146 | * an interrupt. | |
147 | */ | |
148 | BEGIN_LP_RING(32); | |
149 | OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | | |
150 | PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH); | |
151 | OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT); | |
152 | OUT_RING(seqno); | |
153 | OUT_RING(0); | |
154 | PIPE_CONTROL_FLUSH(scratch_addr); | |
155 | scratch_addr += 128; /* write to separate cachelines */ | |
156 | PIPE_CONTROL_FLUSH(scratch_addr); | |
157 | scratch_addr += 128; | |
158 | PIPE_CONTROL_FLUSH(scratch_addr); | |
159 | scratch_addr += 128; | |
160 | PIPE_CONTROL_FLUSH(scratch_addr); | |
161 | scratch_addr += 128; | |
162 | PIPE_CONTROL_FLUSH(scratch_addr); | |
163 | scratch_addr += 128; | |
164 | PIPE_CONTROL_FLUSH(scratch_addr); | |
165 | OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | | |
166 | PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH | | |
167 | PIPE_CONTROL_NOTIFY); | |
168 | OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT); | |
169 | OUT_RING(seqno); | |
170 | OUT_RING(0); | |
171 | ADVANCE_LP_RING(); | |
172 | } else { | |
173 | BEGIN_LP_RING(4); | |
174 | OUT_RING(MI_STORE_DWORD_INDEX); | |
175 | OUT_RING(I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT); | |
176 | OUT_RING(seqno); | |
177 | ||
178 | OUT_RING(MI_USER_INTERRUPT); | |
179 | ADVANCE_LP_RING(); | |
180 | } | |
181 | return seqno; | |
182 | } | |
183 | ||
184 | void i915_user_irq_get(struct drm_device *dev) | |
185 | { | |
186 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
187 | unsigned long irqflags; | |
188 | ||
189 | spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags); | |
190 | if (dev->irq_enabled && (++dev_priv->user_irq_refcount == 1)) { | |
191 | if (HAS_PCH_SPLIT(dev)) | |
192 | ironlake_enable_graphics_irq(dev_priv, GT_PIPE_NOTIFY); | |
193 | else | |
194 | i915_enable_irq(dev_priv, I915_USER_INTERRUPT); | |
195 | } | |
196 | spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags); | |
197 | } | |
198 | ||
199 | void i915_user_irq_put(struct drm_device *dev) | |
200 | { | |
201 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
202 | unsigned long irqflags; | |
203 | ||
204 | spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags); | |
205 | BUG_ON(dev->irq_enabled && dev_priv->user_irq_refcount <= 0); | |
206 | if (dev->irq_enabled && (--dev_priv->user_irq_refcount == 0)) { | |
207 | if (HAS_PCH_SPLIT(dev)) | |
208 | ironlake_disable_graphics_irq(dev_priv, GT_PIPE_NOTIFY); | |
209 | else | |
210 | i915_disable_irq(dev_priv, I915_USER_INTERRUPT); | |
211 | } | |
212 | spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags); | |
213 | } | |
214 | ||
215 | /** Dispatch a batchbuffer to the ring | |
216 | */ | |
217 | int | |
218 | i915_dispatch_gem_execbuffer(struct drm_device *dev, | |
219 | struct drm_i915_gem_execbuffer2 *exec, | |
220 | struct drm_clip_rect *cliprects, | |
221 | uint64_t exec_offset) | |
222 | { | |
223 | drm_i915_private_t *dev_priv = dev->dev_private; | |
224 | int nbox = exec->num_cliprects; | |
225 | int i = 0, count; | |
226 | uint32_t exec_start, exec_len; | |
227 | RING_LOCALS; | |
228 | ||
229 | exec_start = (uint32_t) exec_offset + exec->batch_start_offset; | |
230 | exec_len = (uint32_t) exec->batch_len; | |
231 | ||
232 | trace_i915_gem_request_submit(dev, dev_priv->mm.next_gem_seqno + 1); | |
233 | ||
234 | count = nbox ? nbox : 1; | |
235 | ||
236 | for (i = 0; i < count; i++) { | |
237 | if (i < nbox) { | |
238 | int ret = i915_emit_box(dev, cliprects, i, | |
239 | exec->DR1, exec->DR4); | |
240 | if (ret) | |
241 | return ret; | |
242 | } | |
243 | ||
244 | if (IS_I830(dev) || IS_845G(dev)) { | |
245 | BEGIN_LP_RING(4); | |
246 | OUT_RING(MI_BATCH_BUFFER); | |
247 | OUT_RING(exec_start | MI_BATCH_NON_SECURE); | |
248 | OUT_RING(exec_start + exec_len - 4); | |
249 | OUT_RING(0); | |
250 | ADVANCE_LP_RING(); | |
251 | } else { | |
252 | BEGIN_LP_RING(2); | |
253 | if (IS_I965G(dev)) { | |
254 | OUT_RING(MI_BATCH_BUFFER_START | | |
255 | (2 << 6) | | |
256 | MI_BATCH_NON_SECURE_I965); | |
257 | OUT_RING(exec_start); | |
258 | } else { | |
259 | OUT_RING(MI_BATCH_BUFFER_START | | |
260 | (2 << 6)); | |
261 | OUT_RING(exec_start | MI_BATCH_NON_SECURE); | |
262 | } | |
263 | ADVANCE_LP_RING(); | |
264 | } | |
265 | } | |
266 | ||
267 | /* XXX breadcrumb */ | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static void | |
272 | i915_gem_cleanup_hws(struct drm_device *dev) | |
273 | { | |
274 | drm_i915_private_t *dev_priv = dev->dev_private; | |
275 | struct drm_gem_object *obj; | |
276 | struct drm_i915_gem_object *obj_priv; | |
277 | ||
278 | if (dev_priv->hws_obj == NULL) | |
279 | return; | |
280 | ||
281 | obj = dev_priv->hws_obj; | |
282 | obj_priv = to_intel_bo(obj); | |
283 | ||
284 | kunmap(obj_priv->pages[0]); | |
285 | i915_gem_object_unpin(obj); | |
286 | drm_gem_object_unreference(obj); | |
287 | dev_priv->hws_obj = NULL; | |
288 | ||
289 | memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map)); | |
290 | dev_priv->hw_status_page = NULL; | |
291 | ||
292 | if (HAS_PIPE_CONTROL(dev)) | |
293 | i915_gem_cleanup_pipe_control(dev); | |
294 | ||
295 | /* Write high address into HWS_PGA when disabling. */ | |
296 | I915_WRITE(HWS_PGA, 0x1ffff000); | |
297 | } | |
298 | ||
299 | static int | |
300 | i915_gem_init_hws(struct drm_device *dev) | |
301 | { | |
302 | drm_i915_private_t *dev_priv = dev->dev_private; | |
303 | struct drm_gem_object *obj; | |
304 | struct drm_i915_gem_object *obj_priv; | |
305 | int ret; | |
306 | ||
307 | /* If we need a physical address for the status page, it's already | |
308 | * initialized at driver load time. | |
309 | */ | |
310 | if (!I915_NEED_GFX_HWS(dev)) | |
311 | return 0; | |
312 | ||
313 | obj = i915_gem_alloc_object(dev, 4096); | |
314 | if (obj == NULL) { | |
315 | DRM_ERROR("Failed to allocate status page\n"); | |
316 | ret = -ENOMEM; | |
317 | goto err; | |
318 | } | |
319 | obj_priv = to_intel_bo(obj); | |
320 | obj_priv->agp_type = AGP_USER_CACHED_MEMORY; | |
321 | ||
322 | ret = i915_gem_object_pin(obj, 4096); | |
323 | if (ret != 0) { | |
324 | drm_gem_object_unreference(obj); | |
325 | goto err_unref; | |
326 | } | |
327 | ||
328 | dev_priv->status_gfx_addr = obj_priv->gtt_offset; | |
329 | ||
330 | dev_priv->hw_status_page = kmap(obj_priv->pages[0]); | |
331 | if (dev_priv->hw_status_page == NULL) { | |
332 | DRM_ERROR("Failed to map status page.\n"); | |
333 | memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map)); | |
334 | ret = -EINVAL; | |
335 | goto err_unpin; | |
336 | } | |
337 | ||
338 | if (HAS_PIPE_CONTROL(dev)) { | |
339 | ret = i915_gem_init_pipe_control(dev); | |
340 | if (ret) | |
341 | goto err_unpin; | |
342 | } | |
343 | ||
344 | dev_priv->hws_obj = obj; | |
345 | memset(dev_priv->hw_status_page, 0, PAGE_SIZE); | |
346 | if (IS_GEN6(dev)) { | |
347 | I915_WRITE(HWS_PGA_GEN6, dev_priv->status_gfx_addr); | |
348 | I915_READ(HWS_PGA_GEN6); /* posting read */ | |
349 | } else { | |
350 | I915_WRITE(HWS_PGA, dev_priv->status_gfx_addr); | |
351 | I915_READ(HWS_PGA); /* posting read */ | |
352 | } | |
353 | DRM_DEBUG_DRIVER("hws offset: 0x%08x\n", dev_priv->status_gfx_addr); | |
354 | ||
355 | return 0; | |
356 | ||
357 | err_unpin: | |
358 | i915_gem_object_unpin(obj); | |
359 | err_unref: | |
360 | drm_gem_object_unreference(obj); | |
361 | err: | |
362 | return 0; | |
363 | } | |
364 | ||
365 | int | |
366 | i915_gem_init_ringbuffer(struct drm_device *dev) | |
367 | { | |
368 | drm_i915_private_t *dev_priv = dev->dev_private; | |
369 | struct drm_gem_object *obj; | |
370 | struct drm_i915_gem_object *obj_priv; | |
371 | drm_i915_ring_buffer_t *ring = &dev_priv->ring; | |
372 | int ret; | |
373 | u32 head; | |
374 | ||
375 | ret = i915_gem_init_hws(dev); | |
376 | if (ret != 0) | |
377 | return ret; | |
378 | ||
379 | obj = i915_gem_alloc_object(dev, 128 * 1024); | |
380 | if (obj == NULL) { | |
381 | DRM_ERROR("Failed to allocate ringbuffer\n"); | |
382 | i915_gem_cleanup_hws(dev); | |
383 | return -ENOMEM; | |
384 | } | |
385 | obj_priv = to_intel_bo(obj); | |
386 | ||
387 | ret = i915_gem_object_pin(obj, 4096); | |
388 | if (ret != 0) { | |
389 | drm_gem_object_unreference(obj); | |
390 | i915_gem_cleanup_hws(dev); | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* Set up the kernel mapping for the ring. */ | |
395 | ring->Size = obj->size; | |
396 | ||
397 | ring->map.offset = dev->agp->base + obj_priv->gtt_offset; | |
398 | ring->map.size = obj->size; | |
399 | ring->map.type = 0; | |
400 | ring->map.flags = 0; | |
401 | ring->map.mtrr = 0; | |
402 | ||
403 | drm_core_ioremap_wc(&ring->map, dev); | |
404 | if (ring->map.handle == NULL) { | |
405 | DRM_ERROR("Failed to map ringbuffer.\n"); | |
406 | memset(&dev_priv->ring, 0, sizeof(dev_priv->ring)); | |
407 | i915_gem_object_unpin(obj); | |
408 | drm_gem_object_unreference(obj); | |
409 | i915_gem_cleanup_hws(dev); | |
410 | return -EINVAL; | |
411 | } | |
412 | ring->ring_obj = obj; | |
413 | ring->virtual_start = ring->map.handle; | |
414 | ||
415 | /* Stop the ring if it's running. */ | |
416 | I915_WRITE(PRB0_CTL, 0); | |
417 | I915_WRITE(PRB0_TAIL, 0); | |
418 | I915_WRITE(PRB0_HEAD, 0); | |
419 | ||
420 | /* Initialize the ring. */ | |
421 | I915_WRITE(PRB0_START, obj_priv->gtt_offset); | |
422 | head = I915_READ(PRB0_HEAD) & HEAD_ADDR; | |
423 | ||
424 | /* G45 ring initialization fails to reset head to zero */ | |
425 | if (head != 0) { | |
426 | DRM_ERROR("Ring head not reset to zero " | |
427 | "ctl %08x head %08x tail %08x start %08x\n", | |
428 | I915_READ(PRB0_CTL), | |
429 | I915_READ(PRB0_HEAD), | |
430 | I915_READ(PRB0_TAIL), | |
431 | I915_READ(PRB0_START)); | |
432 | I915_WRITE(PRB0_HEAD, 0); | |
433 | ||
434 | DRM_ERROR("Ring head forced to zero " | |
435 | "ctl %08x head %08x tail %08x start %08x\n", | |
436 | I915_READ(PRB0_CTL), | |
437 | I915_READ(PRB0_HEAD), | |
438 | I915_READ(PRB0_TAIL), | |
439 | I915_READ(PRB0_START)); | |
440 | } | |
441 | ||
442 | I915_WRITE(PRB0_CTL, | |
443 | ((obj->size - 4096) & RING_NR_PAGES) | | |
444 | RING_NO_REPORT | | |
445 | RING_VALID); | |
446 | ||
447 | head = I915_READ(PRB0_HEAD) & HEAD_ADDR; | |
448 | ||
449 | /* If the head is still not zero, the ring is dead */ | |
450 | if (head != 0) { | |
451 | DRM_ERROR("Ring initialization failed " | |
452 | "ctl %08x head %08x tail %08x start %08x\n", | |
453 | I915_READ(PRB0_CTL), | |
454 | I915_READ(PRB0_HEAD), | |
455 | I915_READ(PRB0_TAIL), | |
456 | I915_READ(PRB0_START)); | |
457 | return -EIO; | |
458 | } | |
459 | ||
460 | /* Update our cache of the ring state */ | |
461 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
462 | i915_kernel_lost_context(dev); | |
463 | else { | |
464 | ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR; | |
465 | ring->tail = I915_READ(PRB0_TAIL) & TAIL_ADDR; | |
466 | ring->space = ring->head - (ring->tail + 8); | |
467 | if (ring->space < 0) | |
468 | ring->space += ring->Size; | |
469 | } | |
470 | ||
471 | if (IS_I9XX(dev) && !IS_GEN3(dev)) { | |
472 | I915_WRITE(MI_MODE, | |
473 | (VS_TIMER_DISPATCH) << 16 | VS_TIMER_DISPATCH); | |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | void | |
480 | i915_gem_cleanup_ringbuffer(struct drm_device *dev) | |
481 | { | |
482 | drm_i915_private_t *dev_priv = dev->dev_private; | |
483 | ||
484 | if (dev_priv->ring.ring_obj == NULL) | |
485 | return; | |
486 | ||
487 | drm_core_ioremapfree(&dev_priv->ring.map, dev); | |
488 | ||
489 | i915_gem_object_unpin(dev_priv->ring.ring_obj); | |
490 | drm_gem_object_unreference(dev_priv->ring.ring_obj); | |
491 | dev_priv->ring.ring_obj = NULL; | |
492 | memset(&dev_priv->ring, 0, sizeof(dev_priv->ring)); | |
493 | ||
494 | i915_gem_cleanup_hws(dev); | |
495 | } | |
496 | ||
497 | /* As a ringbuffer is only allowed to wrap between instructions, fill | |
498 | * the tail with NOOPs. | |
499 | */ | |
500 | int i915_wrap_ring(struct drm_device *dev) | |
501 | { | |
502 | drm_i915_private_t *dev_priv = dev->dev_private; | |
503 | volatile unsigned int *virt; | |
504 | int rem; | |
505 | ||
506 | rem = dev_priv->ring.Size - dev_priv->ring.tail; | |
507 | if (dev_priv->ring.space < rem) { | |
508 | int ret = i915_wait_ring(dev, rem, __func__); | |
509 | if (ret) | |
510 | return ret; | |
511 | } | |
512 | dev_priv->ring.space -= rem; | |
513 | ||
514 | virt = (unsigned int *) | |
515 | (dev_priv->ring.virtual_start + dev_priv->ring.tail); | |
516 | rem /= 4; | |
517 | while (rem--) | |
518 | *virt++ = MI_NOOP; | |
519 | ||
520 | dev_priv->ring.tail = 0; | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | int i915_wait_ring(struct drm_device * dev, int n, const char *caller) | |
526 | { | |
527 | drm_i915_private_t *dev_priv = dev->dev_private; | |
528 | drm_i915_ring_buffer_t *ring = &(dev_priv->ring); | |
529 | u32 acthd_reg = IS_I965G(dev) ? ACTHD_I965 : ACTHD; | |
530 | u32 last_acthd = I915_READ(acthd_reg); | |
531 | u32 acthd; | |
532 | u32 last_head = I915_READ(PRB0_HEAD) & HEAD_ADDR; | |
533 | int i; | |
534 | ||
535 | trace_i915_ring_wait_begin (dev); | |
536 | ||
537 | for (i = 0; i < 100000; i++) { | |
538 | ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR; | |
539 | acthd = I915_READ(acthd_reg); | |
540 | ring->space = ring->head - (ring->tail + 8); | |
541 | if (ring->space < 0) | |
542 | ring->space += ring->Size; | |
543 | if (ring->space >= n) { | |
544 | trace_i915_ring_wait_end (dev); | |
545 | return 0; | |
546 | } | |
547 | ||
548 | if (dev->primary->master) { | |
549 | struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv; | |
550 | if (master_priv->sarea_priv) | |
551 | master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT; | |
552 | } | |
553 | ||
554 | ||
555 | if (ring->head != last_head) | |
556 | i = 0; | |
557 | if (acthd != last_acthd) | |
558 | i = 0; | |
559 | ||
560 | last_head = ring->head; | |
561 | last_acthd = acthd; | |
562 | msleep_interruptible(10); | |
563 | ||
564 | } | |
565 | ||
566 | trace_i915_ring_wait_end (dev); | |
567 | return -EBUSY; | |
568 | } |