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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / gpu / drm / i915 / intel_ringbuffer.c
blobca70e2f1044517425ce3ad0ea3ab85db7c0df5ee
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 /*
38 * 965+ support PIPE_CONTROL commands, which provide finer grained control
39 * over cache flushing.
40 */
41 struct pipe_control {
42 struct drm_i915_gem_object *obj;
43 volatile u32 *cpu_page;
44 u32 gtt_offset;
45 };
46
47 static inline int ring_space(struct intel_ring_buffer *ring)
48 {
49 int space = (ring->head & HEAD_ADDR) - (ring->tail + 8);
50 if (space < 0)
51 space += ring->size;
52 return space;
53 }
54
55 static u32 i915_gem_get_seqno(struct drm_device *dev)
56 {
57 drm_i915_private_t *dev_priv = dev->dev_private;
58 u32 seqno;
59
60 seqno = dev_priv->next_seqno;
61
62 /* reserve 0 for non-seqno */
63 if (++dev_priv->next_seqno == 0)
64 dev_priv->next_seqno = 1;
65
66 return seqno;
67 }
68
69 static int
70 render_ring_flush(struct intel_ring_buffer *ring,
71 u32 invalidate_domains,
72 u32 flush_domains)
73 {
74 struct drm_device *dev = ring->dev;
75 u32 cmd;
76 int ret;
77
78 /*
79 * read/write caches:
80 *
81 * I915_GEM_DOMAIN_RENDER is always invalidated, but is
82 * only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is
83 * also flushed at 2d versus 3d pipeline switches.
84 *
85 * read-only caches:
86 *
87 * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
88 * MI_READ_FLUSH is set, and is always flushed on 965.
89 *
90 * I915_GEM_DOMAIN_COMMAND may not exist?
91 *
92 * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
93 * invalidated when MI_EXE_FLUSH is set.
94 *
95 * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
96 * invalidated with every MI_FLUSH.
97 *
98 * TLBs:
99 *
100 * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
101 * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
102 * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
103 * are flushed at any MI_FLUSH.
104 */
105
106 cmd = MI_FLUSH | MI_NO_WRITE_FLUSH;
107 if ((invalidate_domains|flush_domains) &
108 I915_GEM_DOMAIN_RENDER)
109 cmd &= ~MI_NO_WRITE_FLUSH;
110 if (INTEL_INFO(dev)->gen < 4) {
111 /*
112 * On the 965, the sampler cache always gets flushed
113 * and this bit is reserved.
114 */
115 if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER)
116 cmd |= MI_READ_FLUSH;
117 }
118 if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION)
119 cmd |= MI_EXE_FLUSH;
120
121 if (invalidate_domains & I915_GEM_DOMAIN_COMMAND &&
122 (IS_G4X(dev) || IS_GEN5(dev)))
123 cmd |= MI_INVALIDATE_ISP;
124
125 ret = intel_ring_begin(ring, 2);
126 if (ret)
127 return ret;
128
129 intel_ring_emit(ring, cmd);
130 intel_ring_emit(ring, MI_NOOP);
131 intel_ring_advance(ring);
132
133 return 0;
134 }
135
136 /**
137 * Emits a PIPE_CONTROL with a non-zero post-sync operation, for
138 * implementing two workarounds on gen6. From section 1.4.7.1
139 * "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1:
140 *
141 * [DevSNB-C+{W/A}] Before any depth stall flush (including those
142 * produced by non-pipelined state commands), software needs to first
143 * send a PIPE_CONTROL with no bits set except Post-Sync Operation !=
144 * 0.
145 *
146 * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable
147 * =1, a PIPE_CONTROL with any non-zero post-sync-op is required.
148 *
149 * And the workaround for these two requires this workaround first:
150 *
151 * [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent
152 * BEFORE the pipe-control with a post-sync op and no write-cache
153 * flushes.
154 *
155 * And this last workaround is tricky because of the requirements on
156 * that bit. From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM
157 * volume 2 part 1:
158 *
159 * "1 of the following must also be set:
160 * - Render Target Cache Flush Enable ([12] of DW1)
161 * - Depth Cache Flush Enable ([0] of DW1)
162 * - Stall at Pixel Scoreboard ([1] of DW1)
163 * - Depth Stall ([13] of DW1)
164 * - Post-Sync Operation ([13] of DW1)
165 * - Notify Enable ([8] of DW1)"
166 *
167 * The cache flushes require the workaround flush that triggered this
168 * one, so we can't use it. Depth stall would trigger the same.
169 * Post-sync nonzero is what triggered this second workaround, so we
170 * can't use that one either. Notify enable is IRQs, which aren't
171 * really our business. That leaves only stall at scoreboard.
172 */
173 static int
174 intel_emit_post_sync_nonzero_flush(struct intel_ring_buffer *ring)
175 {
176 struct pipe_control *pc = ring->private;
177 u32 scratch_addr = pc->gtt_offset + 128;
178 int ret;
179
180
181 ret = intel_ring_begin(ring, 6);
182 if (ret)
183 return ret;
184
185 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));
186 intel_ring_emit(ring, PIPE_CONTROL_CS_STALL |
187 PIPE_CONTROL_STALL_AT_SCOREBOARD);
188 intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */
189 intel_ring_emit(ring, 0); /* low dword */
190 intel_ring_emit(ring, 0); /* high dword */
191 intel_ring_emit(ring, MI_NOOP);
192 intel_ring_advance(ring);
193
194 ret = intel_ring_begin(ring, 6);
195 if (ret)
196 return ret;
197
198 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));
199 intel_ring_emit(ring, PIPE_CONTROL_QW_WRITE);
200 intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */
201 intel_ring_emit(ring, 0);
202 intel_ring_emit(ring, 0);
203 intel_ring_emit(ring, MI_NOOP);
204 intel_ring_advance(ring);
205
206 return 0;
207 }
208
209 static int
210 gen6_render_ring_flush(struct intel_ring_buffer *ring,
211 u32 invalidate_domains, u32 flush_domains)
212 {
213 u32 flags = 0;
214 struct pipe_control *pc = ring->private;
215 u32 scratch_addr = pc->gtt_offset + 128;
216 int ret;
217
218 /* Force SNB workarounds for PIPE_CONTROL flushes */
219 intel_emit_post_sync_nonzero_flush(ring);
220
221 /* Just flush everything. Experiments have shown that reducing the
222 * number of bits based on the write domains has little performance
223 * impact.
224 */
225 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
226 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
227 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
228 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
229 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
230 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
231 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
232
233 ret = intel_ring_begin(ring, 6);
234 if (ret)
235 return ret;
236
237 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5));
238 intel_ring_emit(ring, flags);
239 intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT);
240 intel_ring_emit(ring, 0); /* lower dword */
241 intel_ring_emit(ring, 0); /* uppwer dword */
242 intel_ring_emit(ring, MI_NOOP);
243 intel_ring_advance(ring);
244
245 return 0;
246 }
247
248 static void ring_write_tail(struct intel_ring_buffer *ring,
249 u32 value)
250 {
251 drm_i915_private_t *dev_priv = ring->dev->dev_private;
252 I915_WRITE_TAIL(ring, value);
253 }
254
255 u32 intel_ring_get_active_head(struct intel_ring_buffer *ring)
256 {
257 drm_i915_private_t *dev_priv = ring->dev->dev_private;
258 u32 acthd_reg = INTEL_INFO(ring->dev)->gen >= 4 ?
259 RING_ACTHD(ring->mmio_base) : ACTHD;
260
261 return I915_READ(acthd_reg);
262 }
263
264 static int init_ring_common(struct intel_ring_buffer *ring)
265 {
266 drm_i915_private_t *dev_priv = ring->dev->dev_private;
267 struct drm_i915_gem_object *obj = ring->obj;
268 u32 head;
269
270 /* Stop the ring if it's running. */
271 I915_WRITE_CTL(ring, 0);
272 I915_WRITE_HEAD(ring, 0);
273 ring->write_tail(ring, 0);
274
275 /* Initialize the ring. */
276 I915_WRITE_START(ring, obj->gtt_offset);
277 head = I915_READ_HEAD(ring) & HEAD_ADDR;
278
279 /* G45 ring initialization fails to reset head to zero */
280 if (head != 0) {
281 DRM_DEBUG_KMS("%s head not reset to zero "
282 "ctl %08x head %08x tail %08x start %08x\n",
283 ring->name,
284 I915_READ_CTL(ring),
285 I915_READ_HEAD(ring),
286 I915_READ_TAIL(ring),
287 I915_READ_START(ring));
288
289 I915_WRITE_HEAD(ring, 0);
290
291 if (I915_READ_HEAD(ring) & HEAD_ADDR) {
292 DRM_ERROR("failed to set %s head to zero "
293 "ctl %08x head %08x tail %08x start %08x\n",
294 ring->name,
295 I915_READ_CTL(ring),
296 I915_READ_HEAD(ring),
297 I915_READ_TAIL(ring),
298 I915_READ_START(ring));
299 }
300 }
301
302 I915_WRITE_CTL(ring,
303 ((ring->size - PAGE_SIZE) & RING_NR_PAGES)
304 | RING_REPORT_64K | RING_VALID);
305
306 /* If the head is still not zero, the ring is dead */
307 if ((I915_READ_CTL(ring) & RING_VALID) == 0 ||
308 I915_READ_START(ring) != obj->gtt_offset ||
309 (I915_READ_HEAD(ring) & HEAD_ADDR) != 0) {
310 DRM_ERROR("%s initialization failed "
311 "ctl %08x head %08x tail %08x start %08x\n",
312 ring->name,
313 I915_READ_CTL(ring),
314 I915_READ_HEAD(ring),
315 I915_READ_TAIL(ring),
316 I915_READ_START(ring));
317 return -EIO;
318 }
319
320 if (!drm_core_check_feature(ring->dev, DRIVER_MODESET))
321 i915_kernel_lost_context(ring->dev);
322 else {
323 ring->head = I915_READ_HEAD(ring);
324 ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
325 ring->space = ring_space(ring);
326 }
327
328 return 0;
329 }
330
331 static int
332 init_pipe_control(struct intel_ring_buffer *ring)
333 {
334 struct pipe_control *pc;
335 struct drm_i915_gem_object *obj;
336 int ret;
337
338 if (ring->private)
339 return 0;
340
341 pc = kmalloc(sizeof(*pc), GFP_KERNEL);
342 if (!pc)
343 return -ENOMEM;
344
345 obj = i915_gem_alloc_object(ring->dev, 4096);
346 if (obj == NULL) {
347 DRM_ERROR("Failed to allocate seqno page\n");
348 ret = -ENOMEM;
349 goto err;
350 }
351
352 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
353
354 ret = i915_gem_object_pin(obj, 4096, true);
355 if (ret)
356 goto err_unref;
357
358 pc->gtt_offset = obj->gtt_offset;
359 pc->cpu_page = kmap(obj->pages[0]);
360 if (pc->cpu_page == NULL)
361 goto err_unpin;
362
363 pc->obj = obj;
364 ring->private = pc;
365 return 0;
366
367 err_unpin:
368 i915_gem_object_unpin(obj);
369 err_unref:
370 drm_gem_object_unreference(&obj->base);
371 err:
372 kfree(pc);
373 return ret;
374 }
375
376 static void
377 cleanup_pipe_control(struct intel_ring_buffer *ring)
378 {
379 struct pipe_control *pc = ring->private;
380 struct drm_i915_gem_object *obj;
381
382 if (!ring->private)
383 return;
384
385 obj = pc->obj;
386 kunmap(obj->pages[0]);
387 i915_gem_object_unpin(obj);
388 drm_gem_object_unreference(&obj->base);
389
390 kfree(pc);
391 ring->private = NULL;
392 }
393
394 static int init_render_ring(struct intel_ring_buffer *ring)
395 {
396 struct drm_device *dev = ring->dev;
397 struct drm_i915_private *dev_priv = dev->dev_private;
398 int ret = init_ring_common(ring);
399
400 if (INTEL_INFO(dev)->gen > 3) {
401 int mode = VS_TIMER_DISPATCH << 16 | VS_TIMER_DISPATCH;
402 if (IS_GEN6(dev) || IS_GEN7(dev))
403 mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;
404 I915_WRITE(MI_MODE, mode);
405 if (IS_GEN7(dev))
406 I915_WRITE(GFX_MODE_GEN7,
407 GFX_MODE_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) |
408 GFX_MODE_ENABLE(GFX_REPLAY_MODE));
409 }
410
411 if (INTEL_INFO(dev)->gen >= 5) {
412 ret = init_pipe_control(ring);
413 if (ret)
414 return ret;
415 }
416
417 return ret;
418 }
419
420 static void render_ring_cleanup(struct intel_ring_buffer *ring)
421 {
422 if (!ring->private)
423 return;
424
425 cleanup_pipe_control(ring);
426 }
427
428 static void
429 update_mboxes(struct intel_ring_buffer *ring,
430 u32 seqno,
431 u32 mmio_offset)
432 {
433 intel_ring_emit(ring, MI_SEMAPHORE_MBOX |
434 MI_SEMAPHORE_GLOBAL_GTT |
435 MI_SEMAPHORE_REGISTER |
436 MI_SEMAPHORE_UPDATE);
437 intel_ring_emit(ring, seqno);
438 intel_ring_emit(ring, mmio_offset);
439 }
440
441 /**
442 * gen6_add_request - Update the semaphore mailbox registers
443 *
444 * @ring - ring that is adding a request
445 * @seqno - return seqno stuck into the ring
446 *
447 * Update the mailbox registers in the *other* rings with the current seqno.
448 * This acts like a signal in the canonical semaphore.
449 */
450 static int
451 gen6_add_request(struct intel_ring_buffer *ring,
452 u32 *seqno)
453 {
454 u32 mbox1_reg;
455 u32 mbox2_reg;
456 int ret;
457
458 ret = intel_ring_begin(ring, 10);
459 if (ret)
460 return ret;
461
462 mbox1_reg = ring->signal_mbox[0];
463 mbox2_reg = ring->signal_mbox[1];
464
465 *seqno = i915_gem_get_seqno(ring->dev);
466
467 update_mboxes(ring, *seqno, mbox1_reg);
468 update_mboxes(ring, *seqno, mbox2_reg);
469 intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
470 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
471 intel_ring_emit(ring, *seqno);
472 intel_ring_emit(ring, MI_USER_INTERRUPT);
473 intel_ring_advance(ring);
474
475 return 0;
476 }
477
478 /**
479 * intel_ring_sync - sync the waiter to the signaller on seqno
480 *
481 * @waiter - ring that is waiting
482 * @signaller - ring which has, or will signal
483 * @seqno - seqno which the waiter will block on
484 */
485 static int
486 intel_ring_sync(struct intel_ring_buffer *waiter,
487 struct intel_ring_buffer *signaller,
488 int ring,
489 u32 seqno)
490 {
491 int ret;
492 u32 dw1 = MI_SEMAPHORE_MBOX |
493 MI_SEMAPHORE_COMPARE |
494 MI_SEMAPHORE_REGISTER;
495
496 ret = intel_ring_begin(waiter, 4);
497 if (ret)
498 return ret;
499
500 intel_ring_emit(waiter, dw1 | signaller->semaphore_register[ring]);
501 intel_ring_emit(waiter, seqno);
502 intel_ring_emit(waiter, 0);
503 intel_ring_emit(waiter, MI_NOOP);
504 intel_ring_advance(waiter);
505
506 return 0;
507 }
508
509 /* VCS->RCS (RVSYNC) or BCS->RCS (RBSYNC) */
510 int
511 render_ring_sync_to(struct intel_ring_buffer *waiter,
512 struct intel_ring_buffer *signaller,
513 u32 seqno)
514 {
515 WARN_ON(signaller->semaphore_register[RCS] == MI_SEMAPHORE_SYNC_INVALID);
516 return intel_ring_sync(waiter,
517 signaller,
518 RCS,
519 seqno);
520 }
521
522 /* RCS->VCS (VRSYNC) or BCS->VCS (VBSYNC) */
523 int
524 gen6_bsd_ring_sync_to(struct intel_ring_buffer *waiter,
525 struct intel_ring_buffer *signaller,
526 u32 seqno)
527 {
528 WARN_ON(signaller->semaphore_register[VCS] == MI_SEMAPHORE_SYNC_INVALID);
529 return intel_ring_sync(waiter,
530 signaller,
531 VCS,
532 seqno);
533 }
534
535 /* RCS->BCS (BRSYNC) or VCS->BCS (BVSYNC) */
536 int
537 gen6_blt_ring_sync_to(struct intel_ring_buffer *waiter,
538 struct intel_ring_buffer *signaller,
539 u32 seqno)
540 {
541 WARN_ON(signaller->semaphore_register[BCS] == MI_SEMAPHORE_SYNC_INVALID);
542 return intel_ring_sync(waiter,
543 signaller,
544 BCS,
545 seqno);
546 }
547
548
549
550 #define PIPE_CONTROL_FLUSH(ring__, addr__) \
551 do { \
552 intel_ring_emit(ring__, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE | \
553 PIPE_CONTROL_DEPTH_STALL); \
554 intel_ring_emit(ring__, (addr__) | PIPE_CONTROL_GLOBAL_GTT); \
555 intel_ring_emit(ring__, 0); \
556 intel_ring_emit(ring__, 0); \
557 } while (0)
558
559 static int
560 pc_render_add_request(struct intel_ring_buffer *ring,
561 u32 *result)
562 {
563 struct drm_device *dev = ring->dev;
564 u32 seqno = i915_gem_get_seqno(dev);
565 struct pipe_control *pc = ring->private;
566 u32 scratch_addr = pc->gtt_offset + 128;
567 int ret;
568
569 /* For Ironlake, MI_USER_INTERRUPT was deprecated and apparently
570 * incoherent with writes to memory, i.e. completely fubar,
571 * so we need to use PIPE_NOTIFY instead.
572 *
573 * However, we also need to workaround the qword write
574 * incoherence by flushing the 6 PIPE_NOTIFY buffers out to
575 * memory before requesting an interrupt.
576 */
577 ret = intel_ring_begin(ring, 32);
578 if (ret)
579 return ret;
580
581 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |
582 PIPE_CONTROL_WRITE_FLUSH |
583 PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE);
584 intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
585 intel_ring_emit(ring, seqno);
586 intel_ring_emit(ring, 0);
587 PIPE_CONTROL_FLUSH(ring, scratch_addr);
588 scratch_addr += 128; /* write to separate cachelines */
589 PIPE_CONTROL_FLUSH(ring, scratch_addr);
590 scratch_addr += 128;
591 PIPE_CONTROL_FLUSH(ring, scratch_addr);
592 scratch_addr += 128;
593 PIPE_CONTROL_FLUSH(ring, scratch_addr);
594 scratch_addr += 128;
595 PIPE_CONTROL_FLUSH(ring, scratch_addr);
596 scratch_addr += 128;
597 PIPE_CONTROL_FLUSH(ring, scratch_addr);
598 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE |
599 PIPE_CONTROL_WRITE_FLUSH |
600 PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE |
601 PIPE_CONTROL_NOTIFY);
602 intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT);
603 intel_ring_emit(ring, seqno);
604 intel_ring_emit(ring, 0);
605 intel_ring_advance(ring);
606
607 *result = seqno;
608 return 0;
609 }
610
611 static int
612 render_ring_add_request(struct intel_ring_buffer *ring,
613 u32 *result)
614 {
615 struct drm_device *dev = ring->dev;
616 u32 seqno = i915_gem_get_seqno(dev);
617 int ret;
618
619 ret = intel_ring_begin(ring, 4);
620 if (ret)
621 return ret;
622
623 intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
624 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
625 intel_ring_emit(ring, seqno);
626 intel_ring_emit(ring, MI_USER_INTERRUPT);
627 intel_ring_advance(ring);
628
629 *result = seqno;
630 return 0;
631 }
632
633 static u32
634 ring_get_seqno(struct intel_ring_buffer *ring)
635 {
636 return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
637 }
638
639 static u32
640 pc_render_get_seqno(struct intel_ring_buffer *ring)
641 {
642 struct pipe_control *pc = ring->private;
643 return pc->cpu_page[0];
644 }
645
646 static void
647 ironlake_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
648 {
649 dev_priv->gt_irq_mask &= ~mask;
650 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
651 POSTING_READ(GTIMR);
652 }
653
654 static void
655 ironlake_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
656 {
657 dev_priv->gt_irq_mask |= mask;
658 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
659 POSTING_READ(GTIMR);
660 }
661
662 static void
663 i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
664 {
665 dev_priv->irq_mask &= ~mask;
666 I915_WRITE(IMR, dev_priv->irq_mask);
667 POSTING_READ(IMR);
668 }
669
670 static void
671 i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
672 {
673 dev_priv->irq_mask |= mask;
674 I915_WRITE(IMR, dev_priv->irq_mask);
675 POSTING_READ(IMR);
676 }
677
678 static bool
679 render_ring_get_irq(struct intel_ring_buffer *ring)
680 {
681 struct drm_device *dev = ring->dev;
682 drm_i915_private_t *dev_priv = dev->dev_private;
683
684 if (!dev->irq_enabled)
685 return false;
686
687 spin_lock(&ring->irq_lock);
688 if (ring->irq_refcount++ == 0) {
689 if (HAS_PCH_SPLIT(dev))
690 ironlake_enable_irq(dev_priv,
691 GT_PIPE_NOTIFY | GT_USER_INTERRUPT);
692 else
693 i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
694 }
695 spin_unlock(&ring->irq_lock);
696
697 return true;
698 }
699
700 static void
701 render_ring_put_irq(struct intel_ring_buffer *ring)
702 {
703 struct drm_device *dev = ring->dev;
704 drm_i915_private_t *dev_priv = dev->dev_private;
705
706 spin_lock(&ring->irq_lock);
707 if (--ring->irq_refcount == 0) {
708 if (HAS_PCH_SPLIT(dev))
709 ironlake_disable_irq(dev_priv,
710 GT_USER_INTERRUPT |
711 GT_PIPE_NOTIFY);
712 else
713 i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
714 }
715 spin_unlock(&ring->irq_lock);
716 }
717
718 void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
719 {
720 struct drm_device *dev = ring->dev;
721 drm_i915_private_t *dev_priv = ring->dev->dev_private;
722 u32 mmio = 0;
723
724 /* The ring status page addresses are no longer next to the rest of
725 * the ring registers as of gen7.
726 */
727 if (IS_GEN7(dev)) {
728 switch (ring->id) {
729 case RING_RENDER:
730 mmio = RENDER_HWS_PGA_GEN7;
731 break;
732 case RING_BLT:
733 mmio = BLT_HWS_PGA_GEN7;
734 break;
735 case RING_BSD:
736 mmio = BSD_HWS_PGA_GEN7;
737 break;
738 }
739 } else if (IS_GEN6(ring->dev)) {
740 mmio = RING_HWS_PGA_GEN6(ring->mmio_base);
741 } else {
742 mmio = RING_HWS_PGA(ring->mmio_base);
743 }
744
745 I915_WRITE(mmio, (u32)ring->status_page.gfx_addr);
746 POSTING_READ(mmio);
747 }
748
749 static int
750 bsd_ring_flush(struct intel_ring_buffer *ring,
751 u32 invalidate_domains,
752 u32 flush_domains)
753 {
754 int ret;
755
756 ret = intel_ring_begin(ring, 2);
757 if (ret)
758 return ret;
759
760 intel_ring_emit(ring, MI_FLUSH);
761 intel_ring_emit(ring, MI_NOOP);
762 intel_ring_advance(ring);
763 return 0;
764 }
765
766 static int
767 ring_add_request(struct intel_ring_buffer *ring,
768 u32 *result)
769 {
770 u32 seqno;
771 int ret;
772
773 ret = intel_ring_begin(ring, 4);
774 if (ret)
775 return ret;
776
777 seqno = i915_gem_get_seqno(ring->dev);
778
779 intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
780 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
781 intel_ring_emit(ring, seqno);
782 intel_ring_emit(ring, MI_USER_INTERRUPT);
783 intel_ring_advance(ring);
784
785 *result = seqno;
786 return 0;
787 }
788
789 static bool
790 gen6_ring_get_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
791 {
792 struct drm_device *dev = ring->dev;
793 drm_i915_private_t *dev_priv = dev->dev_private;
794
795 if (!dev->irq_enabled)
796 return false;
797
798 spin_lock(&ring->irq_lock);
799 if (ring->irq_refcount++ == 0) {
800 ring->irq_mask &= ~rflag;
801 I915_WRITE_IMR(ring, ring->irq_mask);
802 ironlake_enable_irq(dev_priv, gflag);
803 }
804 spin_unlock(&ring->irq_lock);
805
806 return true;
807 }
808
809 static void
810 gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
811 {
812 struct drm_device *dev = ring->dev;
813 drm_i915_private_t *dev_priv = dev->dev_private;
814
815 spin_lock(&ring->irq_lock);
816 if (--ring->irq_refcount == 0) {
817 ring->irq_mask |= rflag;
818 I915_WRITE_IMR(ring, ring->irq_mask);
819 ironlake_disable_irq(dev_priv, gflag);
820 }
821 spin_unlock(&ring->irq_lock);
822 }
823
824 static bool
825 bsd_ring_get_irq(struct intel_ring_buffer *ring)
826 {
827 struct drm_device *dev = ring->dev;
828 drm_i915_private_t *dev_priv = dev->dev_private;
829
830 if (!dev->irq_enabled)
831 return false;
832
833 spin_lock(&ring->irq_lock);
834 if (ring->irq_refcount++ == 0) {
835 if (IS_G4X(dev))
836 i915_enable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
837 else
838 ironlake_enable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
839 }
840 spin_unlock(&ring->irq_lock);
841
842 return true;
843 }
844 static void
845 bsd_ring_put_irq(struct intel_ring_buffer *ring)
846 {
847 struct drm_device *dev = ring->dev;
848 drm_i915_private_t *dev_priv = dev->dev_private;
849
850 spin_lock(&ring->irq_lock);
851 if (--ring->irq_refcount == 0) {
852 if (IS_G4X(dev))
853 i915_disable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
854 else
855 ironlake_disable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
856 }
857 spin_unlock(&ring->irq_lock);
858 }
859
860 static int
861 ring_dispatch_execbuffer(struct intel_ring_buffer *ring, u32 offset, u32 length)
862 {
863 int ret;
864
865 ret = intel_ring_begin(ring, 2);
866 if (ret)
867 return ret;
868
869 intel_ring_emit(ring,
870 MI_BATCH_BUFFER_START | (2 << 6) |
871 MI_BATCH_NON_SECURE_I965);
872 intel_ring_emit(ring, offset);
873 intel_ring_advance(ring);
874
875 return 0;
876 }
877
878 static int
879 render_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
880 u32 offset, u32 len)
881 {
882 struct drm_device *dev = ring->dev;
883 int ret;
884
885 if (IS_I830(dev) || IS_845G(dev)) {
886 ret = intel_ring_begin(ring, 4);
887 if (ret)
888 return ret;
889
890 intel_ring_emit(ring, MI_BATCH_BUFFER);
891 intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);
892 intel_ring_emit(ring, offset + len - 8);
893 intel_ring_emit(ring, 0);
894 } else {
895 ret = intel_ring_begin(ring, 2);
896 if (ret)
897 return ret;
898
899 if (INTEL_INFO(dev)->gen >= 4) {
900 intel_ring_emit(ring,
901 MI_BATCH_BUFFER_START | (2 << 6) |
902 MI_BATCH_NON_SECURE_I965);
903 intel_ring_emit(ring, offset);
904 } else {
905 intel_ring_emit(ring,
906 MI_BATCH_BUFFER_START | (2 << 6));
907 intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);
908 }
909 }
910 intel_ring_advance(ring);
911
912 return 0;
913 }
914
915 static void cleanup_status_page(struct intel_ring_buffer *ring)
916 {
917 drm_i915_private_t *dev_priv = ring->dev->dev_private;
918 struct drm_i915_gem_object *obj;
919
920 obj = ring->status_page.obj;
921 if (obj == NULL)
922 return;
923
924 kunmap(obj->pages[0]);
925 i915_gem_object_unpin(obj);
926 drm_gem_object_unreference(&obj->base);
927 ring->status_page.obj = NULL;
928
929 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
930 }
931
932 static int init_status_page(struct intel_ring_buffer *ring)
933 {
934 struct drm_device *dev = ring->dev;
935 drm_i915_private_t *dev_priv = dev->dev_private;
936 struct drm_i915_gem_object *obj;
937 int ret;
938
939 obj = i915_gem_alloc_object(dev, 4096);
940 if (obj == NULL) {
941 DRM_ERROR("Failed to allocate status page\n");
942 ret = -ENOMEM;
943 goto err;
944 }
945
946 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
947
948 ret = i915_gem_object_pin(obj, 4096, true);
949 if (ret != 0) {
950 goto err_unref;
951 }
952
953 ring->status_page.gfx_addr = obj->gtt_offset;
954 ring->status_page.page_addr = kmap(obj->pages[0]);
955 if (ring->status_page.page_addr == NULL) {
956 memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map));
957 goto err_unpin;
958 }
959 ring->status_page.obj = obj;
960 memset(ring->status_page.page_addr, 0, PAGE_SIZE);
961
962 intel_ring_setup_status_page(ring);
963 DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
964 ring->name, ring->status_page.gfx_addr);
965
966 return 0;
967
968 err_unpin:
969 i915_gem_object_unpin(obj);
970 err_unref:
971 drm_gem_object_unreference(&obj->base);
972 err:
973 return ret;
974 }
975
976 int intel_init_ring_buffer(struct drm_device *dev,
977 struct intel_ring_buffer *ring)
978 {
979 struct drm_i915_gem_object *obj;
980 int ret;
981
982 ring->dev = dev;
983 INIT_LIST_HEAD(&ring->active_list);
984 INIT_LIST_HEAD(&ring->request_list);
985 INIT_LIST_HEAD(&ring->gpu_write_list);
986
987 init_waitqueue_head(&ring->irq_queue);
988 spin_lock_init(&ring->irq_lock);
989 ring->irq_mask = ~0;
990
991 if (I915_NEED_GFX_HWS(dev)) {
992 ret = init_status_page(ring);
993 if (ret)
994 return ret;
995 }
996
997 obj = i915_gem_alloc_object(dev, ring->size);
998 if (obj == NULL) {
999 DRM_ERROR("Failed to allocate ringbuffer\n");
1000 ret = -ENOMEM;
1001 goto err_hws;
1002 }
1003
1004 ring->obj = obj;
1005
1006 ret = i915_gem_object_pin(obj, PAGE_SIZE, true);
1007 if (ret)
1008 goto err_unref;
1009
1010 ring->map.size = ring->size;
1011 ring->map.offset = dev->agp->base + obj->gtt_offset;
1012 ring->map.type = 0;
1013 ring->map.flags = 0;
1014 ring->map.mtrr = 0;
1015
1016 drm_core_ioremap_wc(&ring->map, dev);
1017 if (ring->map.handle == NULL) {
1018 DRM_ERROR("Failed to map ringbuffer.\n");
1019 ret = -EINVAL;
1020 goto err_unpin;
1021 }
1022
1023 ring->virtual_start = ring->map.handle;
1024 ret = ring->init(ring);
1025 if (ret)
1026 goto err_unmap;
1027
1028 /* Workaround an erratum on the i830 which causes a hang if
1029 * the TAIL pointer points to within the last 2 cachelines
1030 * of the buffer.
1031 */
1032 ring->effective_size = ring->size;
1033 if (IS_I830(ring->dev))
1034 ring->effective_size -= 128;
1035
1036 return 0;
1037
1038 err_unmap:
1039 drm_core_ioremapfree(&ring->map, dev);
1040 err_unpin:
1041 i915_gem_object_unpin(obj);
1042 err_unref:
1043 drm_gem_object_unreference(&obj->base);
1044 ring->obj = NULL;
1045 err_hws:
1046 cleanup_status_page(ring);
1047 return ret;
1048 }
1049
1050 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring)
1051 {
1052 struct drm_i915_private *dev_priv;
1053 int ret;
1054
1055 if (ring->obj == NULL)
1056 return;
1057
1058 /* Disable the ring buffer. The ring must be idle at this point */
1059 dev_priv = ring->dev->dev_private;
1060 ret = intel_wait_ring_idle(ring);
1061 if (ret)
1062 DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
1063 ring->name, ret);
1064
1065 I915_WRITE_CTL(ring, 0);
1066
1067 drm_core_ioremapfree(&ring->map, ring->dev);
1068
1069 i915_gem_object_unpin(ring->obj);
1070 drm_gem_object_unreference(&ring->obj->base);
1071 ring->obj = NULL;
1072
1073 if (ring->cleanup)
1074 ring->cleanup(ring);
1075
1076 cleanup_status_page(ring);
1077 }
1078
1079 static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring)
1080 {
1081 unsigned int *virt;
1082 int rem = ring->size - ring->tail;
1083
1084 if (ring->space < rem) {
1085 int ret = intel_wait_ring_buffer(ring, rem);
1086 if (ret)
1087 return ret;
1088 }
1089
1090 virt = (unsigned int *)(ring->virtual_start + ring->tail);
1091 rem /= 8;
1092 while (rem--) {
1093 *virt++ = MI_NOOP;
1094 *virt++ = MI_NOOP;
1095 }
1096
1097 ring->tail = 0;
1098 ring->space = ring_space(ring);
1099
1100 return 0;
1101 }
1102
1103 int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n)
1104 {
1105 struct drm_device *dev = ring->dev;
1106 struct drm_i915_private *dev_priv = dev->dev_private;
1107 unsigned long end;
1108 u32 head;
1109
1110 /* If the reported head position has wrapped or hasn't advanced,
1111 * fallback to the slow and accurate path.
1112 */
1113 head = intel_read_status_page(ring, 4);
1114 if (head > ring->head) {
1115 ring->head = head;
1116 ring->space = ring_space(ring);
1117 if (ring->space >= n)
1118 return 0;
1119 }
1120
1121 trace_i915_ring_wait_begin(ring);
1122 end = jiffies + 3 * HZ;
1123 do {
1124 ring->head = I915_READ_HEAD(ring);
1125 ring->space = ring_space(ring);
1126 if (ring->space >= n) {
1127 trace_i915_ring_wait_end(ring);
1128 return 0;
1129 }
1130
1131 if (dev->primary->master) {
1132 struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
1133 if (master_priv->sarea_priv)
1134 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
1135 }
1136
1137 msleep(1);
1138 if (atomic_read(&dev_priv->mm.wedged))
1139 return -EAGAIN;
1140 } while (!time_after(jiffies, end));
1141 trace_i915_ring_wait_end(ring);
1142 return -EBUSY;
1143 }
1144
1145 int intel_ring_begin(struct intel_ring_buffer *ring,
1146 int num_dwords)
1147 {
1148 struct drm_i915_private *dev_priv = ring->dev->dev_private;
1149 int n = 4*num_dwords;
1150 int ret;
1151
1152 if (unlikely(atomic_read(&dev_priv->mm.wedged)))
1153 return -EIO;
1154
1155 if (unlikely(ring->tail + n > ring->effective_size)) {
1156 ret = intel_wrap_ring_buffer(ring);
1157 if (unlikely(ret))
1158 return ret;
1159 }
1160
1161 if (unlikely(ring->space < n)) {
1162 ret = intel_wait_ring_buffer(ring, n);
1163 if (unlikely(ret))
1164 return ret;
1165 }
1166
1167 ring->space -= n;
1168 return 0;
1169 }
1170
1171 void intel_ring_advance(struct intel_ring_buffer *ring)
1172 {
1173 ring->tail &= ring->size - 1;
1174 ring->write_tail(ring, ring->tail);
1175 }
1176
1177 static const struct intel_ring_buffer render_ring = {
1178 .name = "render ring",
1179 .id = RING_RENDER,
1180 .mmio_base = RENDER_RING_BASE,
1181 .size = 32 * PAGE_SIZE,
1182 .init = init_render_ring,
1183 .write_tail = ring_write_tail,
1184 .flush = render_ring_flush,
1185 .add_request = render_ring_add_request,
1186 .get_seqno = ring_get_seqno,
1187 .irq_get = render_ring_get_irq,
1188 .irq_put = render_ring_put_irq,
1189 .dispatch_execbuffer = render_ring_dispatch_execbuffer,
1190 .cleanup = render_ring_cleanup,
1191 .sync_to = render_ring_sync_to,
1192 .semaphore_register = {MI_SEMAPHORE_SYNC_INVALID,
1193 MI_SEMAPHORE_SYNC_RV,
1194 MI_SEMAPHORE_SYNC_RB},
1195 .signal_mbox = {GEN6_VRSYNC, GEN6_BRSYNC},
1196 };
1197
1198 /* ring buffer for bit-stream decoder */
1199
1200 static const struct intel_ring_buffer bsd_ring = {
1201 .name = "bsd ring",
1202 .id = RING_BSD,
1203 .mmio_base = BSD_RING_BASE,
1204 .size = 32 * PAGE_SIZE,
1205 .init = init_ring_common,
1206 .write_tail = ring_write_tail,
1207 .flush = bsd_ring_flush,
1208 .add_request = ring_add_request,
1209 .get_seqno = ring_get_seqno,
1210 .irq_get = bsd_ring_get_irq,
1211 .irq_put = bsd_ring_put_irq,
1212 .dispatch_execbuffer = ring_dispatch_execbuffer,
1213 };
1214
1215
1216 static void gen6_bsd_ring_write_tail(struct intel_ring_buffer *ring,
1217 u32 value)
1218 {
1219 drm_i915_private_t *dev_priv = ring->dev->dev_private;
1220
1221 /* Every tail move must follow the sequence below */
1222 I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
1223 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
1224 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE);
1225 I915_WRITE(GEN6_BSD_RNCID, 0x0);
1226
1227 if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) &
1228 GEN6_BSD_SLEEP_PSMI_CONTROL_IDLE_INDICATOR) == 0,
1229 50))
1230 DRM_ERROR("timed out waiting for IDLE Indicator\n");
1231
1232 I915_WRITE_TAIL(ring, value);
1233 I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
1234 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
1235 GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_ENABLE);
1236 }
1237
1238 static int gen6_ring_flush(struct intel_ring_buffer *ring,
1239 u32 invalidate, u32 flush)
1240 {
1241 uint32_t cmd;
1242 int ret;
1243
1244 ret = intel_ring_begin(ring, 4);
1245 if (ret)
1246 return ret;
1247
1248 cmd = MI_FLUSH_DW;
1249 if (invalidate & I915_GEM_GPU_DOMAINS)
1250 cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD;
1251 intel_ring_emit(ring, cmd);
1252 intel_ring_emit(ring, 0);
1253 intel_ring_emit(ring, 0);
1254 intel_ring_emit(ring, MI_NOOP);
1255 intel_ring_advance(ring);
1256 return 0;
1257 }
1258
1259 static int
1260 gen6_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
1261 u32 offset, u32 len)
1262 {
1263 int ret;
1264
1265 ret = intel_ring_begin(ring, 2);
1266 if (ret)
1267 return ret;
1268
1269 intel_ring_emit(ring, MI_BATCH_BUFFER_START | MI_BATCH_NON_SECURE_I965);
1270 /* bit0-7 is the length on GEN6+ */
1271 intel_ring_emit(ring, offset);
1272 intel_ring_advance(ring);
1273
1274 return 0;
1275 }
1276
1277 static bool
1278 gen6_render_ring_get_irq(struct intel_ring_buffer *ring)
1279 {
1280 return gen6_ring_get_irq(ring,
1281 GT_USER_INTERRUPT,
1282 GEN6_RENDER_USER_INTERRUPT);
1283 }
1284
1285 static void
1286 gen6_render_ring_put_irq(struct intel_ring_buffer *ring)
1287 {
1288 return gen6_ring_put_irq(ring,
1289 GT_USER_INTERRUPT,
1290 GEN6_RENDER_USER_INTERRUPT);
1291 }
1292
1293 static bool
1294 gen6_bsd_ring_get_irq(struct intel_ring_buffer *ring)
1295 {
1296 return gen6_ring_get_irq(ring,
1297 GT_GEN6_BSD_USER_INTERRUPT,
1298 GEN6_BSD_USER_INTERRUPT);
1299 }
1300
1301 static void
1302 gen6_bsd_ring_put_irq(struct intel_ring_buffer *ring)
1303 {
1304 return gen6_ring_put_irq(ring,
1305 GT_GEN6_BSD_USER_INTERRUPT,
1306 GEN6_BSD_USER_INTERRUPT);
1307 }
1308
1309 /* ring buffer for Video Codec for Gen6+ */
1310 static const struct intel_ring_buffer gen6_bsd_ring = {
1311 .name = "gen6 bsd ring",
1312 .id = RING_BSD,
1313 .mmio_base = GEN6_BSD_RING_BASE,
1314 .size = 32 * PAGE_SIZE,
1315 .init = init_ring_common,
1316 .write_tail = gen6_bsd_ring_write_tail,
1317 .flush = gen6_ring_flush,
1318 .add_request = gen6_add_request,
1319 .get_seqno = ring_get_seqno,
1320 .irq_get = gen6_bsd_ring_get_irq,
1321 .irq_put = gen6_bsd_ring_put_irq,
1322 .dispatch_execbuffer = gen6_ring_dispatch_execbuffer,
1323 .sync_to = gen6_bsd_ring_sync_to,
1324 .semaphore_register = {MI_SEMAPHORE_SYNC_VR,
1325 MI_SEMAPHORE_SYNC_INVALID,
1326 MI_SEMAPHORE_SYNC_VB},
1327 .signal_mbox = {GEN6_RVSYNC, GEN6_BVSYNC},
1328 };
1329
1330 /* Blitter support (SandyBridge+) */
1331
1332 static bool
1333 blt_ring_get_irq(struct intel_ring_buffer *ring)
1334 {
1335 return gen6_ring_get_irq(ring,
1336 GT_BLT_USER_INTERRUPT,
1337 GEN6_BLITTER_USER_INTERRUPT);
1338 }
1339
1340 static void
1341 blt_ring_put_irq(struct intel_ring_buffer *ring)
1342 {
1343 gen6_ring_put_irq(ring,
1344 GT_BLT_USER_INTERRUPT,
1345 GEN6_BLITTER_USER_INTERRUPT);
1346 }
1347
1348
1349 /* Workaround for some stepping of SNB,
1350 * each time when BLT engine ring tail moved,
1351 * the first command in the ring to be parsed
1352 * should be MI_BATCH_BUFFER_START
1353 */
1354 #define NEED_BLT_WORKAROUND(dev) \
1355 (IS_GEN6(dev) && (dev->pdev->revision < 8))
1356
1357 static inline struct drm_i915_gem_object *
1358 to_blt_workaround(struct intel_ring_buffer *ring)
1359 {
1360 return ring->private;
1361 }
1362
1363 static int blt_ring_init(struct intel_ring_buffer *ring)
1364 {
1365 if (NEED_BLT_WORKAROUND(ring->dev)) {
1366 struct drm_i915_gem_object *obj;
1367 u32 *ptr;
1368 int ret;
1369
1370 obj = i915_gem_alloc_object(ring->dev, 4096);
1371 if (obj == NULL)
1372 return -ENOMEM;
1373
1374 ret = i915_gem_object_pin(obj, 4096, true);
1375 if (ret) {
1376 drm_gem_object_unreference(&obj->base);
1377 return ret;
1378 }
1379
1380 ptr = kmap(obj->pages[0]);
1381 *ptr++ = MI_BATCH_BUFFER_END;
1382 *ptr++ = MI_NOOP;
1383 kunmap(obj->pages[0]);
1384
1385 ret = i915_gem_object_set_to_gtt_domain(obj, false);
1386 if (ret) {
1387 i915_gem_object_unpin(obj);
1388 drm_gem_object_unreference(&obj->base);
1389 return ret;
1390 }
1391
1392 ring->private = obj;
1393 }
1394
1395 return init_ring_common(ring);
1396 }
1397
1398 static int blt_ring_begin(struct intel_ring_buffer *ring,
1399 int num_dwords)
1400 {
1401 if (ring->private) {
1402 int ret = intel_ring_begin(ring, num_dwords+2);
1403 if (ret)
1404 return ret;
1405
1406 intel_ring_emit(ring, MI_BATCH_BUFFER_START);
1407 intel_ring_emit(ring, to_blt_workaround(ring)->gtt_offset);
1408
1409 return 0;
1410 } else
1411 return intel_ring_begin(ring, 4);
1412 }
1413
1414 static int blt_ring_flush(struct intel_ring_buffer *ring,
1415 u32 invalidate, u32 flush)
1416 {
1417 uint32_t cmd;
1418 int ret;
1419
1420 ret = blt_ring_begin(ring, 4);
1421 if (ret)
1422 return ret;
1423
1424 cmd = MI_FLUSH_DW;
1425 if (invalidate & I915_GEM_DOMAIN_RENDER)
1426 cmd |= MI_INVALIDATE_TLB;
1427 intel_ring_emit(ring, cmd);
1428 intel_ring_emit(ring, 0);
1429 intel_ring_emit(ring, 0);
1430 intel_ring_emit(ring, MI_NOOP);
1431 intel_ring_advance(ring);
1432 return 0;
1433 }
1434
1435 static void blt_ring_cleanup(struct intel_ring_buffer *ring)
1436 {
1437 if (!ring->private)
1438 return;
1439
1440 i915_gem_object_unpin(ring->private);
1441 drm_gem_object_unreference(ring->private);
1442 ring->private = NULL;
1443 }
1444
1445 static const struct intel_ring_buffer gen6_blt_ring = {
1446 .name = "blt ring",
1447 .id = RING_BLT,
1448 .mmio_base = BLT_RING_BASE,
1449 .size = 32 * PAGE_SIZE,
1450 .init = blt_ring_init,
1451 .write_tail = ring_write_tail,
1452 .flush = blt_ring_flush,
1453 .add_request = gen6_add_request,
1454 .get_seqno = ring_get_seqno,
1455 .irq_get = blt_ring_get_irq,
1456 .irq_put = blt_ring_put_irq,
1457 .dispatch_execbuffer = gen6_ring_dispatch_execbuffer,
1458 .cleanup = blt_ring_cleanup,
1459 .sync_to = gen6_blt_ring_sync_to,
1460 .semaphore_register = {MI_SEMAPHORE_SYNC_BR,
1461 MI_SEMAPHORE_SYNC_BV,
1462 MI_SEMAPHORE_SYNC_INVALID},
1463 .signal_mbox = {GEN6_RBSYNC, GEN6_VBSYNC},
1464 };
1465
1466 int intel_init_render_ring_buffer(struct drm_device *dev)
1467 {
1468 drm_i915_private_t *dev_priv = dev->dev_private;
1469 struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
1470
1471 *ring = render_ring;
1472 if (INTEL_INFO(dev)->gen >= 6) {
1473 ring->add_request = gen6_add_request;
1474 ring->flush = gen6_render_ring_flush;
1475 ring->irq_get = gen6_render_ring_get_irq;
1476 ring->irq_put = gen6_render_ring_put_irq;
1477 } else if (IS_GEN5(dev)) {
1478 ring->add_request = pc_render_add_request;
1479 ring->get_seqno = pc_render_get_seqno;
1480 }
1481
1482 if (!I915_NEED_GFX_HWS(dev)) {
1483 ring->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
1484 memset(ring->status_page.page_addr, 0, PAGE_SIZE);
1485 }
1486
1487 return intel_init_ring_buffer(dev, ring);
1488 }
1489
1490 int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size)
1491 {
1492 drm_i915_private_t *dev_priv = dev->dev_private;
1493 struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
1494
1495 *ring = render_ring;
1496 if (INTEL_INFO(dev)->gen >= 6) {
1497 ring->add_request = gen6_add_request;
1498 ring->irq_get = gen6_render_ring_get_irq;
1499 ring->irq_put = gen6_render_ring_put_irq;
1500 } else if (IS_GEN5(dev)) {
1501 ring->add_request = pc_render_add_request;
1502 ring->get_seqno = pc_render_get_seqno;
1503 }
1504
1505 if (!I915_NEED_GFX_HWS(dev))
1506 ring->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
1507
1508 ring->dev = dev;
1509 INIT_LIST_HEAD(&ring->active_list);
1510 INIT_LIST_HEAD(&ring->request_list);
1511 INIT_LIST_HEAD(&ring->gpu_write_list);
1512
1513 ring->size = size;
1514 ring->effective_size = ring->size;
1515 if (IS_I830(ring->dev))
1516 ring->effective_size -= 128;
1517
1518 ring->map.offset = start;
1519 ring->map.size = size;
1520 ring->map.type = 0;
1521 ring->map.flags = 0;
1522 ring->map.mtrr = 0;
1523
1524 drm_core_ioremap_wc(&ring->map, dev);
1525 if (ring->map.handle == NULL) {
1526 DRM_ERROR("can not ioremap virtual address for"
1527 " ring buffer\n");
1528 return -ENOMEM;
1529 }
1530
1531 ring->virtual_start = (void __force __iomem *)ring->map.handle;
1532 return 0;
1533 }
1534
1535 int intel_init_bsd_ring_buffer(struct drm_device *dev)
1536 {
1537 drm_i915_private_t *dev_priv = dev->dev_private;
1538 struct intel_ring_buffer *ring = &dev_priv->ring[VCS];
1539
1540 if (IS_GEN6(dev) || IS_GEN7(dev))
1541 *ring = gen6_bsd_ring;
1542 else
1543 *ring = bsd_ring;
1544
1545 return intel_init_ring_buffer(dev, ring);
1546 }
1547
1548 int intel_init_blt_ring_buffer(struct drm_device *dev)
1549 {
1550 drm_i915_private_t *dev_priv = dev->dev_private;
1551 struct intel_ring_buffer *ring = &dev_priv->ring[BCS];
1552
1553 *ring = gen6_blt_ring;
1554
1555 return intel_init_ring_buffer(dev, ring);
1556 }
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