1 /*
2  * Copyright 2009 Jerome Glisse.
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sub license, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
20  *
21  * The above copyright notice and this permission notice (including the
22  * next paragraph) shall be included in all copies or substantial portions
23  * of the Software.
24  *
25  */
26 /*
27  * Authors:
28  *    Jerome Glisse <glisse@freedesktop.org>
29  *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
30  *    Dave Airlie
31  */
32 
33 #include <linux/io.h>
34 #include <linux/list.h>
35 #include <linux/slab.h>
36 
37 #include <drm/drm_cache.h>
38 #include <drm/drm_prime.h>
39 #include <drm/radeon_drm.h>
40 
41 #include "radeon.h"
42 #include "radeon_trace.h"
43 #include "radeon_ttm.h"
44 
45 static void radeon_bo_clear_surface_reg(struct radeon_bo *bo);
46 
47 /*
48  * To exclude mutual BO access we rely on bo_reserve exclusion, as all
49  * function are calling it.
50  */
51 
52 static void radeon_ttm_bo_destroy(struct ttm_buffer_object *tbo)
53 {
54 	struct radeon_bo *bo;
55 
56 	bo = container_of(tbo, struct radeon_bo, tbo);
57 
58 	mutex_lock(&bo->rdev->gem.mutex);
59 	list_del_init(&bo->list);
60 	mutex_unlock(&bo->rdev->gem.mutex);
61 	radeon_bo_clear_surface_reg(bo);
62 	WARN_ON_ONCE(!list_empty(&bo->va));
63 	if (bo->tbo.base.import_attach)
64 		drm_prime_gem_destroy(&bo->tbo.base, bo->tbo.sg);
65 	drm_gem_object_release(&bo->tbo.base);
66 	kfree(bo);
67 }
68 
69 bool radeon_ttm_bo_is_radeon_bo(struct ttm_buffer_object *bo)
70 {
71 	if (bo->destroy == &radeon_ttm_bo_destroy)
72 		return true;
73 	return false;
74 }
75 
76 void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
77 {
78 	u32 c = 0, i;
79 
80 	rbo->placement.placement = rbo->placements;
81 	rbo->placement.busy_placement = rbo->placements;
82 	if (domain & RADEON_GEM_DOMAIN_VRAM) {
83 		/* Try placing BOs which don't need CPU access outside of the
84 		 * CPU accessible part of VRAM
85 		 */
86 		if ((rbo->flags & RADEON_GEM_NO_CPU_ACCESS) &&
87 		    rbo->rdev->mc.visible_vram_size < rbo->rdev->mc.real_vram_size) {
88 			rbo->placements[c].fpfn =
89 				rbo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
90 			rbo->placements[c].mem_type = TTM_PL_VRAM;
91 			rbo->placements[c++].flags = 0;
92 		}
93 
94 		rbo->placements[c].fpfn = 0;
95 		rbo->placements[c].mem_type = TTM_PL_VRAM;
96 		rbo->placements[c++].flags = 0;
97 	}
98 
99 	if (domain & RADEON_GEM_DOMAIN_GTT) {
100 		rbo->placements[c].fpfn = 0;
101 		rbo->placements[c].mem_type = TTM_PL_TT;
102 		rbo->placements[c++].flags = 0;
103 	}
104 
105 	if (domain & RADEON_GEM_DOMAIN_CPU) {
106 		rbo->placements[c].fpfn = 0;
107 		rbo->placements[c].mem_type = TTM_PL_SYSTEM;
108 		rbo->placements[c++].flags = 0;
109 	}
110 	if (!c) {
111 		rbo->placements[c].fpfn = 0;
112 		rbo->placements[c].mem_type = TTM_PL_SYSTEM;
113 		rbo->placements[c++].flags = 0;
114 	}
115 
116 	rbo->placement.num_placement = c;
117 	rbo->placement.num_busy_placement = c;
118 
119 	for (i = 0; i < c; ++i) {
120 		if ((rbo->flags & RADEON_GEM_CPU_ACCESS) &&
121 		    (rbo->placements[i].mem_type == TTM_PL_VRAM) &&
122 		    !rbo->placements[i].fpfn)
123 			rbo->placements[i].lpfn =
124 				rbo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
125 		else
126 			rbo->placements[i].lpfn = 0;
127 	}
128 }
129 
130 int radeon_bo_create(struct radeon_device *rdev,
131 		     unsigned long size, int byte_align, bool kernel,
132 		     u32 domain, u32 flags, struct sg_table *sg,
133 		     struct dma_resv *resv,
134 		     struct radeon_bo **bo_ptr)
135 {
136 	struct radeon_bo *bo;
137 	enum ttm_bo_type type;
138 	unsigned long page_align = roundup(byte_align, PAGE_SIZE) >> PAGE_SHIFT;
139 	int r;
140 
141 	size = ALIGN(size, PAGE_SIZE);
142 
143 	if (kernel) {
144 		type = ttm_bo_type_kernel;
145 	} else if (sg) {
146 		type = ttm_bo_type_sg;
147 	} else {
148 		type = ttm_bo_type_device;
149 	}
150 	*bo_ptr = NULL;
151 
152 	bo = kzalloc(sizeof(struct radeon_bo), GFP_KERNEL);
153 	if (bo == NULL)
154 		return -ENOMEM;
155 	drm_gem_private_object_init(rdev->ddev, &bo->tbo.base, size);
156 	bo->rdev = rdev;
157 	bo->surface_reg = -1;
158 	INIT_LIST_HEAD(&bo->list);
159 	INIT_LIST_HEAD(&bo->va);
160 	bo->initial_domain = domain & (RADEON_GEM_DOMAIN_VRAM |
161 				       RADEON_GEM_DOMAIN_GTT |
162 				       RADEON_GEM_DOMAIN_CPU);
163 
164 	bo->flags = flags;
165 	/* PCI GART is always snooped */
166 	if (!(rdev->flags & RADEON_IS_PCIE))
167 		bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
168 
169 	/* Write-combined CPU mappings of GTT cause GPU hangs with RV6xx
170 	 * See https://bugs.freedesktop.org/show_bug.cgi?id=91268
171 	 */
172 	if (rdev->family >= CHIP_RV610 && rdev->family <= CHIP_RV635)
173 		bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
174 
175 #ifdef CONFIG_X86_32
176 	/* XXX: Write-combined CPU mappings of GTT seem broken on 32-bit
177 	 * See https://bugs.freedesktop.org/show_bug.cgi?id=84627
178 	 */
179 	bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
180 #elif defined(CONFIG_X86) && !defined(CONFIG_X86_PAT)
181 	/* Don't try to enable write-combining when it can't work, or things
182 	 * may be slow
183 	 * See https://bugs.freedesktop.org/show_bug.cgi?id=88758
184 	 */
185 #ifndef CONFIG_COMPILE_TEST
186 #warning Please enable CONFIG_MTRR and CONFIG_X86_PAT for better performance \
187 	 thanks to write-combining
188 #endif
189 
190 	if (bo->flags & RADEON_GEM_GTT_WC)
191 		DRM_INFO_ONCE("Please enable CONFIG_MTRR and CONFIG_X86_PAT for "
192 			      "better performance thanks to write-combining\n");
193 	bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
194 #else
195 	/* For architectures that don't support WC memory,
196 	 * mask out the WC flag from the BO
197 	 */
198 	if (!drm_arch_can_wc_memory())
199 		bo->flags &= ~RADEON_GEM_GTT_WC;
200 #endif
201 
202 	radeon_ttm_placement_from_domain(bo, domain);
203 	/* Kernel allocation are uninterruptible */
204 	down_read(&rdev->pm.mclk_lock);
205 	r = ttm_bo_init_validate(&rdev->mman.bdev, &bo->tbo, type,
206 				 &bo->placement, page_align, !kernel, sg, resv,
207 				 &radeon_ttm_bo_destroy);
208 	up_read(&rdev->pm.mclk_lock);
209 	if (unlikely(r != 0)) {
210 		return r;
211 	}
212 	*bo_ptr = bo;
213 
214 	trace_radeon_bo_create(bo);
215 
216 	return 0;
217 }
218 
219 int radeon_bo_kmap(struct radeon_bo *bo, void **ptr)
220 {
221 	bool is_iomem;
222 	long r;
223 
224 	r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_KERNEL,
225 				  false, MAX_SCHEDULE_TIMEOUT);
226 	if (r < 0)
227 		return r;
228 
229 	if (bo->kptr) {
230 		if (ptr) {
231 			*ptr = bo->kptr;
232 		}
233 		return 0;
234 	}
235 	r = ttm_bo_kmap(&bo->tbo, 0, PFN_UP(bo->tbo.base.size), &bo->kmap);
236 	if (r) {
237 		return r;
238 	}
239 	bo->kptr = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
240 	if (ptr) {
241 		*ptr = bo->kptr;
242 	}
243 	radeon_bo_check_tiling(bo, 0, 0);
244 	return 0;
245 }
246 
247 void radeon_bo_kunmap(struct radeon_bo *bo)
248 {
249 	if (bo->kptr == NULL)
250 		return;
251 	bo->kptr = NULL;
252 	radeon_bo_check_tiling(bo, 0, 0);
253 	ttm_bo_kunmap(&bo->kmap);
254 }
255 
256 struct radeon_bo *radeon_bo_ref(struct radeon_bo *bo)
257 {
258 	if (bo == NULL)
259 		return NULL;
260 
261 	ttm_bo_get(&bo->tbo);
262 	return bo;
263 }
264 
265 void radeon_bo_unref(struct radeon_bo **bo)
266 {
267 	struct ttm_buffer_object *tbo;
268 
269 	if ((*bo) == NULL)
270 		return;
271 	tbo = &((*bo)->tbo);
272 	ttm_bo_put(tbo);
273 	*bo = NULL;
274 }
275 
276 int radeon_bo_pin_restricted(struct radeon_bo *bo, u32 domain, u64 max_offset,
277 			     u64 *gpu_addr)
278 {
279 	struct ttm_operation_ctx ctx = { false, false };
280 	int r, i;
281 
282 	if (radeon_ttm_tt_has_userptr(bo->rdev, bo->tbo.ttm))
283 		return -EPERM;
284 
285 	if (bo->tbo.pin_count) {
286 		ttm_bo_pin(&bo->tbo);
287 		if (gpu_addr)
288 			*gpu_addr = radeon_bo_gpu_offset(bo);
289 
290 		if (max_offset != 0) {
291 			u64 domain_start;
292 
293 			if (domain == RADEON_GEM_DOMAIN_VRAM)
294 				domain_start = bo->rdev->mc.vram_start;
295 			else
296 				domain_start = bo->rdev->mc.gtt_start;
297 			WARN_ON_ONCE(max_offset <
298 				     (radeon_bo_gpu_offset(bo) - domain_start));
299 		}
300 
301 		return 0;
302 	}
303 	if (bo->prime_shared_count && domain == RADEON_GEM_DOMAIN_VRAM) {
304 		/* A BO shared as a dma-buf cannot be sensibly migrated to VRAM */
305 		return -EINVAL;
306 	}
307 
308 	radeon_ttm_placement_from_domain(bo, domain);
309 	for (i = 0; i < bo->placement.num_placement; i++) {
310 		/* force to pin into visible video ram */
311 		if ((bo->placements[i].mem_type == TTM_PL_VRAM) &&
312 		    !(bo->flags & RADEON_GEM_NO_CPU_ACCESS) &&
313 		    (!max_offset || max_offset > bo->rdev->mc.visible_vram_size))
314 			bo->placements[i].lpfn =
315 				bo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
316 		else
317 			bo->placements[i].lpfn = max_offset >> PAGE_SHIFT;
318 	}
319 
320 	r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
321 	if (likely(r == 0)) {
322 		ttm_bo_pin(&bo->tbo);
323 		if (gpu_addr != NULL)
324 			*gpu_addr = radeon_bo_gpu_offset(bo);
325 		if (domain == RADEON_GEM_DOMAIN_VRAM)
326 			bo->rdev->vram_pin_size += radeon_bo_size(bo);
327 		else
328 			bo->rdev->gart_pin_size += radeon_bo_size(bo);
329 	} else {
330 		dev_err(bo->rdev->dev, "%p pin failed\n", bo);
331 	}
332 	return r;
333 }
334 
335 int radeon_bo_pin(struct radeon_bo *bo, u32 domain, u64 *gpu_addr)
336 {
337 	return radeon_bo_pin_restricted(bo, domain, 0, gpu_addr);
338 }
339 
340 void radeon_bo_unpin(struct radeon_bo *bo)
341 {
342 	ttm_bo_unpin(&bo->tbo);
343 	if (!bo->tbo.pin_count) {
344 		if (bo->tbo.resource->mem_type == TTM_PL_VRAM)
345 			bo->rdev->vram_pin_size -= radeon_bo_size(bo);
346 		else
347 			bo->rdev->gart_pin_size -= radeon_bo_size(bo);
348 	}
349 }
350 
351 int radeon_bo_evict_vram(struct radeon_device *rdev)
352 {
353 	struct ttm_device *bdev = &rdev->mman.bdev;
354 	struct ttm_resource_manager *man;
355 
356 	/* late 2.6.33 fix IGP hibernate - we need pm ops to do this correct */
357 #ifndef CONFIG_HIBERNATION
358 	if (rdev->flags & RADEON_IS_IGP) {
359 		if (rdev->mc.igp_sideport_enabled == false)
360 			/* Useless to evict on IGP chips */
361 			return 0;
362 	}
363 #endif
364 	man = ttm_manager_type(bdev, TTM_PL_VRAM);
365 	if (!man)
366 		return 0;
367 	return ttm_resource_manager_evict_all(bdev, man);
368 }
369 
370 void radeon_bo_force_delete(struct radeon_device *rdev)
371 {
372 	struct radeon_bo *bo, *n;
373 
374 	if (list_empty(&rdev->gem.objects)) {
375 		return;
376 	}
377 	dev_err(rdev->dev, "Userspace still has active objects !\n");
378 	list_for_each_entry_safe(bo, n, &rdev->gem.objects, list) {
379 		dev_err(rdev->dev, "%p %p %lu %lu force free\n",
380 			&bo->tbo.base, bo, (unsigned long)bo->tbo.base.size,
381 			*((unsigned long *)&bo->tbo.base.refcount));
382 		mutex_lock(&bo->rdev->gem.mutex);
383 		list_del_init(&bo->list);
384 		mutex_unlock(&bo->rdev->gem.mutex);
385 		/* this should unref the ttm bo */
386 		drm_gem_object_put(&bo->tbo.base);
387 	}
388 }
389 
390 int radeon_bo_init(struct radeon_device *rdev)
391 {
392 	/* reserve PAT memory space to WC for VRAM */
393 	arch_io_reserve_memtype_wc(rdev->mc.aper_base,
394 				   rdev->mc.aper_size);
395 
396 	/* Add an MTRR for the VRAM */
397 	if (!rdev->fastfb_working) {
398 		rdev->mc.vram_mtrr = arch_phys_wc_add(rdev->mc.aper_base,
399 						      rdev->mc.aper_size);
400 	}
401 	DRM_INFO("Detected VRAM RAM=%lluM, BAR=%lluM\n",
402 		rdev->mc.mc_vram_size >> 20,
403 		(unsigned long long)rdev->mc.aper_size >> 20);
404 	DRM_INFO("RAM width %dbits %cDR\n",
405 			rdev->mc.vram_width, rdev->mc.vram_is_ddr ? 'D' : 'S');
406 	return radeon_ttm_init(rdev);
407 }
408 
409 void radeon_bo_fini(struct radeon_device *rdev)
410 {
411 	radeon_ttm_fini(rdev);
412 	arch_phys_wc_del(rdev->mc.vram_mtrr);
413 	arch_io_free_memtype_wc(rdev->mc.aper_base, rdev->mc.aper_size);
414 }
415 
416 /* Returns how many bytes TTM can move per IB.
417  */
418 static u64 radeon_bo_get_threshold_for_moves(struct radeon_device *rdev)
419 {
420 	u64 real_vram_size = rdev->mc.real_vram_size;
421 	struct ttm_resource_manager *man =
422 		ttm_manager_type(&rdev->mman.bdev, TTM_PL_VRAM);
423 	u64 vram_usage = ttm_resource_manager_usage(man);
424 
425 	/* This function is based on the current VRAM usage.
426 	 *
427 	 * - If all of VRAM is free, allow relocating the number of bytes that
428 	 *   is equal to 1/4 of the size of VRAM for this IB.
429 
430 	 * - If more than one half of VRAM is occupied, only allow relocating
431 	 *   1 MB of data for this IB.
432 	 *
433 	 * - From 0 to one half of used VRAM, the threshold decreases
434 	 *   linearly.
435 	 *         __________________
436 	 * 1/4 of -|\               |
437 	 * VRAM    | \              |
438 	 *         |  \             |
439 	 *         |   \            |
440 	 *         |    \           |
441 	 *         |     \          |
442 	 *         |      \         |
443 	 *         |       \________|1 MB
444 	 *         |----------------|
445 	 *    VRAM 0 %             100 %
446 	 *         used            used
447 	 *
448 	 * Note: It's a threshold, not a limit. The threshold must be crossed
449 	 * for buffer relocations to stop, so any buffer of an arbitrary size
450 	 * can be moved as long as the threshold isn't crossed before
451 	 * the relocation takes place. We don't want to disable buffer
452 	 * relocations completely.
453 	 *
454 	 * The idea is that buffers should be placed in VRAM at creation time
455 	 * and TTM should only do a minimum number of relocations during
456 	 * command submission. In practice, you need to submit at least
457 	 * a dozen IBs to move all buffers to VRAM if they are in GTT.
458 	 *
459 	 * Also, things can get pretty crazy under memory pressure and actual
460 	 * VRAM usage can change a lot, so playing safe even at 50% does
461 	 * consistently increase performance.
462 	 */
463 
464 	u64 half_vram = real_vram_size >> 1;
465 	u64 half_free_vram = vram_usage >= half_vram ? 0 : half_vram - vram_usage;
466 	u64 bytes_moved_threshold = half_free_vram >> 1;
467 	return max(bytes_moved_threshold, 1024*1024ull);
468 }
469 
470 int radeon_bo_list_validate(struct radeon_device *rdev,
471 			    struct ww_acquire_ctx *ticket,
472 			    struct list_head *head, int ring)
473 {
474 	struct ttm_operation_ctx ctx = { true, false };
475 	struct radeon_bo_list *lobj;
476 	struct list_head duplicates;
477 	int r;
478 	u64 bytes_moved = 0, initial_bytes_moved;
479 	u64 bytes_moved_threshold = radeon_bo_get_threshold_for_moves(rdev);
480 
481 	INIT_LIST_HEAD(&duplicates);
482 	r = ttm_eu_reserve_buffers(ticket, head, true, &duplicates);
483 	if (unlikely(r != 0)) {
484 		return r;
485 	}
486 
487 	list_for_each_entry(lobj, head, tv.head) {
488 		struct radeon_bo *bo = lobj->robj;
489 		if (!bo->tbo.pin_count) {
490 			u32 domain = lobj->preferred_domains;
491 			u32 allowed = lobj->allowed_domains;
492 			u32 current_domain =
493 				radeon_mem_type_to_domain(bo->tbo.resource->mem_type);
494 
495 			/* Check if this buffer will be moved and don't move it
496 			 * if we have moved too many buffers for this IB already.
497 			 *
498 			 * Note that this allows moving at least one buffer of
499 			 * any size, because it doesn't take the current "bo"
500 			 * into account. We don't want to disallow buffer moves
501 			 * completely.
502 			 */
503 			if ((allowed & current_domain) != 0 &&
504 			    (domain & current_domain) == 0 && /* will be moved */
505 			    bytes_moved > bytes_moved_threshold) {
506 				/* don't move it */
507 				domain = current_domain;
508 			}
509 
510 		retry:
511 			radeon_ttm_placement_from_domain(bo, domain);
512 			if (ring == R600_RING_TYPE_UVD_INDEX)
513 				radeon_uvd_force_into_uvd_segment(bo, allowed);
514 
515 			initial_bytes_moved = atomic64_read(&rdev->num_bytes_moved);
516 			r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
517 			bytes_moved += atomic64_read(&rdev->num_bytes_moved) -
518 				       initial_bytes_moved;
519 
520 			if (unlikely(r)) {
521 				if (r != -ERESTARTSYS &&
522 				    domain != lobj->allowed_domains) {
523 					domain = lobj->allowed_domains;
524 					goto retry;
525 				}
526 				ttm_eu_backoff_reservation(ticket, head);
527 				return r;
528 			}
529 		}
530 		lobj->gpu_offset = radeon_bo_gpu_offset(bo);
531 		lobj->tiling_flags = bo->tiling_flags;
532 	}
533 
534 	list_for_each_entry(lobj, &duplicates, tv.head) {
535 		lobj->gpu_offset = radeon_bo_gpu_offset(lobj->robj);
536 		lobj->tiling_flags = lobj->robj->tiling_flags;
537 	}
538 
539 	return 0;
540 }
541 
542 int radeon_bo_get_surface_reg(struct radeon_bo *bo)
543 {
544 	struct radeon_device *rdev = bo->rdev;
545 	struct radeon_surface_reg *reg;
546 	struct radeon_bo *old_object;
547 	int steal;
548 	int i;
549 
550 	dma_resv_assert_held(bo->tbo.base.resv);
551 
552 	if (!bo->tiling_flags)
553 		return 0;
554 
555 	if (bo->surface_reg >= 0) {
556 		i = bo->surface_reg;
557 		goto out;
558 	}
559 
560 	steal = -1;
561 	for (i = 0; i < RADEON_GEM_MAX_SURFACES; i++) {
562 
563 		reg = &rdev->surface_regs[i];
564 		if (!reg->bo)
565 			break;
566 
567 		old_object = reg->bo;
568 		if (old_object->tbo.pin_count == 0)
569 			steal = i;
570 	}
571 
572 	/* if we are all out */
573 	if (i == RADEON_GEM_MAX_SURFACES) {
574 		if (steal == -1)
575 			return -ENOMEM;
576 		/* find someone with a surface reg and nuke their BO */
577 		reg = &rdev->surface_regs[steal];
578 		old_object = reg->bo;
579 		/* blow away the mapping */
580 		DRM_DEBUG("stealing surface reg %d from %p\n", steal, old_object);
581 		ttm_bo_unmap_virtual(&old_object->tbo);
582 		old_object->surface_reg = -1;
583 		i = steal;
584 	}
585 
586 	bo->surface_reg = i;
587 	reg->bo = bo;
588 
589 out:
590 	radeon_set_surface_reg(rdev, i, bo->tiling_flags, bo->pitch,
591 			       bo->tbo.resource->start << PAGE_SHIFT,
592 			       bo->tbo.base.size);
593 	return 0;
594 }
595 
596 static void radeon_bo_clear_surface_reg(struct radeon_bo *bo)
597 {
598 	struct radeon_device *rdev = bo->rdev;
599 	struct radeon_surface_reg *reg;
600 
601 	if (bo->surface_reg == -1)
602 		return;
603 
604 	reg = &rdev->surface_regs[bo->surface_reg];
605 	radeon_clear_surface_reg(rdev, bo->surface_reg);
606 
607 	reg->bo = NULL;
608 	bo->surface_reg = -1;
609 }
610 
611 int radeon_bo_set_tiling_flags(struct radeon_bo *bo,
612 				uint32_t tiling_flags, uint32_t pitch)
613 {
614 	struct radeon_device *rdev = bo->rdev;
615 	int r;
616 
617 	if (rdev->family >= CHIP_CEDAR) {
618 		unsigned bankw, bankh, mtaspect, tilesplit, stilesplit;
619 
620 		bankw = (tiling_flags >> RADEON_TILING_EG_BANKW_SHIFT) & RADEON_TILING_EG_BANKW_MASK;
621 		bankh = (tiling_flags >> RADEON_TILING_EG_BANKH_SHIFT) & RADEON_TILING_EG_BANKH_MASK;
622 		mtaspect = (tiling_flags >> RADEON_TILING_EG_MACRO_TILE_ASPECT_SHIFT) & RADEON_TILING_EG_MACRO_TILE_ASPECT_MASK;
623 		tilesplit = (tiling_flags >> RADEON_TILING_EG_TILE_SPLIT_SHIFT) & RADEON_TILING_EG_TILE_SPLIT_MASK;
624 		stilesplit = (tiling_flags >> RADEON_TILING_EG_STENCIL_TILE_SPLIT_SHIFT) & RADEON_TILING_EG_STENCIL_TILE_SPLIT_MASK;
625 		switch (bankw) {
626 		case 0:
627 		case 1:
628 		case 2:
629 		case 4:
630 		case 8:
631 			break;
632 		default:
633 			return -EINVAL;
634 		}
635 		switch (bankh) {
636 		case 0:
637 		case 1:
638 		case 2:
639 		case 4:
640 		case 8:
641 			break;
642 		default:
643 			return -EINVAL;
644 		}
645 		switch (mtaspect) {
646 		case 0:
647 		case 1:
648 		case 2:
649 		case 4:
650 		case 8:
651 			break;
652 		default:
653 			return -EINVAL;
654 		}
655 		if (tilesplit > 6) {
656 			return -EINVAL;
657 		}
658 		if (stilesplit > 6) {
659 			return -EINVAL;
660 		}
661 	}
662 	r = radeon_bo_reserve(bo, false);
663 	if (unlikely(r != 0))
664 		return r;
665 	bo->tiling_flags = tiling_flags;
666 	bo->pitch = pitch;
667 	radeon_bo_unreserve(bo);
668 	return 0;
669 }
670 
671 void radeon_bo_get_tiling_flags(struct radeon_bo *bo,
672 				uint32_t *tiling_flags,
673 				uint32_t *pitch)
674 {
675 	dma_resv_assert_held(bo->tbo.base.resv);
676 
677 	if (tiling_flags)
678 		*tiling_flags = bo->tiling_flags;
679 	if (pitch)
680 		*pitch = bo->pitch;
681 }
682 
683 int radeon_bo_check_tiling(struct radeon_bo *bo, bool has_moved,
684 				bool force_drop)
685 {
686 	if (!force_drop)
687 		dma_resv_assert_held(bo->tbo.base.resv);
688 
689 	if (!(bo->tiling_flags & RADEON_TILING_SURFACE))
690 		return 0;
691 
692 	if (force_drop) {
693 		radeon_bo_clear_surface_reg(bo);
694 		return 0;
695 	}
696 
697 	if (bo->tbo.resource->mem_type != TTM_PL_VRAM) {
698 		if (!has_moved)
699 			return 0;
700 
701 		if (bo->surface_reg >= 0)
702 			radeon_bo_clear_surface_reg(bo);
703 		return 0;
704 	}
705 
706 	if ((bo->surface_reg >= 0) && !has_moved)
707 		return 0;
708 
709 	return radeon_bo_get_surface_reg(bo);
710 }
711 
712 void radeon_bo_move_notify(struct ttm_buffer_object *bo)
713 {
714 	struct radeon_bo *rbo;
715 
716 	if (!radeon_ttm_bo_is_radeon_bo(bo))
717 		return;
718 
719 	rbo = container_of(bo, struct radeon_bo, tbo);
720 	radeon_bo_check_tiling(rbo, 0, 1);
721 	radeon_vm_bo_invalidate(rbo->rdev, rbo);
722 }
723 
724 vm_fault_t radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
725 {
726 	struct ttm_operation_ctx ctx = { false, false };
727 	struct radeon_device *rdev;
728 	struct radeon_bo *rbo;
729 	unsigned long offset, size, lpfn;
730 	int i, r;
731 
732 	if (!radeon_ttm_bo_is_radeon_bo(bo))
733 		return 0;
734 	rbo = container_of(bo, struct radeon_bo, tbo);
735 	radeon_bo_check_tiling(rbo, 0, 0);
736 	rdev = rbo->rdev;
737 	if (bo->resource->mem_type != TTM_PL_VRAM)
738 		return 0;
739 
740 	size = bo->resource->size;
741 	offset = bo->resource->start << PAGE_SHIFT;
742 	if ((offset + size) <= rdev->mc.visible_vram_size)
743 		return 0;
744 
745 	/* Can't move a pinned BO to visible VRAM */
746 	if (rbo->tbo.pin_count > 0)
747 		return VM_FAULT_SIGBUS;
748 
749 	/* hurrah the memory is not visible ! */
750 	radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_VRAM);
751 	lpfn =	rdev->mc.visible_vram_size >> PAGE_SHIFT;
752 	for (i = 0; i < rbo->placement.num_placement; i++) {
753 		/* Force into visible VRAM */
754 		if ((rbo->placements[i].mem_type == TTM_PL_VRAM) &&
755 		    (!rbo->placements[i].lpfn || rbo->placements[i].lpfn > lpfn))
756 			rbo->placements[i].lpfn = lpfn;
757 	}
758 	r = ttm_bo_validate(bo, &rbo->placement, &ctx);
759 	if (unlikely(r == -ENOMEM)) {
760 		radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_GTT);
761 		r = ttm_bo_validate(bo, &rbo->placement, &ctx);
762 	} else if (likely(!r)) {
763 		offset = bo->resource->start << PAGE_SHIFT;
764 		/* this should never happen */
765 		if ((offset + size) > rdev->mc.visible_vram_size)
766 			return VM_FAULT_SIGBUS;
767 	}
768 
769 	if (unlikely(r == -EBUSY || r == -ERESTARTSYS))
770 		return VM_FAULT_NOPAGE;
771 	else if (unlikely(r))
772 		return VM_FAULT_SIGBUS;
773 
774 	ttm_bo_move_to_lru_tail_unlocked(bo);
775 	return 0;
776 }
777 
778 /**
779  * radeon_bo_fence - add fence to buffer object
780  *
781  * @bo: buffer object in question
782  * @fence: fence to add
783  * @shared: true if fence should be added shared
784  *
785  */
786 void radeon_bo_fence(struct radeon_bo *bo, struct radeon_fence *fence,
787 		     bool shared)
788 {
789 	struct dma_resv *resv = bo->tbo.base.resv;
790 	int r;
791 
792 	r = dma_resv_reserve_fences(resv, 1);
793 	if (r) {
794 		/* As last resort on OOM we block for the fence */
795 		dma_fence_wait(&fence->base, false);
796 		return;
797 	}
798 
799 	dma_resv_add_fence(resv, &fence->base, shared ?
800 			   DMA_RESV_USAGE_READ : DMA_RESV_USAGE_WRITE);
801 }
802