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/dma-mapping.h>
34 #include <linux/pagemap.h>
35 #include <linux/pci.h>
36 #include <linux/seq_file.h>
37 #include <linux/slab.h>
38 #include <linux/swap.h>
39 #include <linux/swiotlb.h>
40 
41 #include <drm/drm_device.h>
42 #include <drm/drm_file.h>
43 #include <drm/drm_prime.h>
44 #include <drm/radeon_drm.h>
45 #include <drm/ttm/ttm_bo_api.h>
46 #include <drm/ttm/ttm_bo_driver.h>
47 #include <drm/ttm/ttm_placement.h>
48 #include <drm/ttm/ttm_range_manager.h>
49 
50 #include "radeon_reg.h"
51 #include "radeon.h"
52 #include "radeon_ttm.h"
53 
54 static void radeon_ttm_debugfs_init(struct radeon_device *rdev);
55 
56 static int radeon_ttm_tt_bind(struct ttm_device *bdev, struct ttm_tt *ttm,
57 			      struct ttm_resource *bo_mem);
58 static void radeon_ttm_tt_unbind(struct ttm_device *bdev, struct ttm_tt *ttm);
59 
60 struct radeon_device *radeon_get_rdev(struct ttm_device *bdev)
61 {
62 	struct radeon_mman *mman;
63 	struct radeon_device *rdev;
64 
65 	mman = container_of(bdev, struct radeon_mman, bdev);
66 	rdev = container_of(mman, struct radeon_device, mman);
67 	return rdev;
68 }
69 
70 static int radeon_ttm_init_vram(struct radeon_device *rdev)
71 {
72 	return ttm_range_man_init(&rdev->mman.bdev, TTM_PL_VRAM,
73 				  false, rdev->mc.real_vram_size >> PAGE_SHIFT);
74 }
75 
76 static int radeon_ttm_init_gtt(struct radeon_device *rdev)
77 {
78 	return ttm_range_man_init(&rdev->mman.bdev, TTM_PL_TT,
79 				  true, rdev->mc.gtt_size >> PAGE_SHIFT);
80 }
81 
82 static void radeon_evict_flags(struct ttm_buffer_object *bo,
83 				struct ttm_placement *placement)
84 {
85 	static const struct ttm_place placements = {
86 		.fpfn = 0,
87 		.lpfn = 0,
88 		.mem_type = TTM_PL_SYSTEM,
89 		.flags = 0
90 	};
91 
92 	struct radeon_bo *rbo;
93 
94 	if (!radeon_ttm_bo_is_radeon_bo(bo)) {
95 		placement->placement = &placements;
96 		placement->busy_placement = &placements;
97 		placement->num_placement = 1;
98 		placement->num_busy_placement = 1;
99 		return;
100 	}
101 	rbo = container_of(bo, struct radeon_bo, tbo);
102 	switch (bo->resource->mem_type) {
103 	case TTM_PL_VRAM:
104 		if (rbo->rdev->ring[radeon_copy_ring_index(rbo->rdev)].ready == false)
105 			radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_CPU);
106 		else if (rbo->rdev->mc.visible_vram_size < rbo->rdev->mc.real_vram_size &&
107 			 bo->resource->start < (rbo->rdev->mc.visible_vram_size >> PAGE_SHIFT)) {
108 			unsigned fpfn = rbo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
109 			int i;
110 
111 			/* Try evicting to the CPU inaccessible part of VRAM
112 			 * first, but only set GTT as busy placement, so this
113 			 * BO will be evicted to GTT rather than causing other
114 			 * BOs to be evicted from VRAM
115 			 */
116 			radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_VRAM |
117 							 RADEON_GEM_DOMAIN_GTT);
118 			rbo->placement.num_busy_placement = 0;
119 			for (i = 0; i < rbo->placement.num_placement; i++) {
120 				if (rbo->placements[i].mem_type == TTM_PL_VRAM) {
121 					if (rbo->placements[i].fpfn < fpfn)
122 						rbo->placements[i].fpfn = fpfn;
123 				} else {
124 					rbo->placement.busy_placement =
125 						&rbo->placements[i];
126 					rbo->placement.num_busy_placement = 1;
127 				}
128 			}
129 		} else
130 			radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_GTT);
131 		break;
132 	case TTM_PL_TT:
133 	default:
134 		radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_CPU);
135 	}
136 	*placement = rbo->placement;
137 }
138 
139 static int radeon_move_blit(struct ttm_buffer_object *bo,
140 			bool evict,
141 			struct ttm_resource *new_mem,
142 			struct ttm_resource *old_mem)
143 {
144 	struct radeon_device *rdev;
145 	uint64_t old_start, new_start;
146 	struct radeon_fence *fence;
147 	unsigned num_pages;
148 	int r, ridx;
149 
150 	rdev = radeon_get_rdev(bo->bdev);
151 	ridx = radeon_copy_ring_index(rdev);
152 	old_start = (u64)old_mem->start << PAGE_SHIFT;
153 	new_start = (u64)new_mem->start << PAGE_SHIFT;
154 
155 	switch (old_mem->mem_type) {
156 	case TTM_PL_VRAM:
157 		old_start += rdev->mc.vram_start;
158 		break;
159 	case TTM_PL_TT:
160 		old_start += rdev->mc.gtt_start;
161 		break;
162 	default:
163 		DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
164 		return -EINVAL;
165 	}
166 	switch (new_mem->mem_type) {
167 	case TTM_PL_VRAM:
168 		new_start += rdev->mc.vram_start;
169 		break;
170 	case TTM_PL_TT:
171 		new_start += rdev->mc.gtt_start;
172 		break;
173 	default:
174 		DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
175 		return -EINVAL;
176 	}
177 	if (!rdev->ring[ridx].ready) {
178 		DRM_ERROR("Trying to move memory with ring turned off.\n");
179 		return -EINVAL;
180 	}
181 
182 	BUILD_BUG_ON((PAGE_SIZE % RADEON_GPU_PAGE_SIZE) != 0);
183 
184 	num_pages = new_mem->num_pages * (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
185 	fence = radeon_copy(rdev, old_start, new_start, num_pages, bo->base.resv);
186 	if (IS_ERR(fence))
187 		return PTR_ERR(fence);
188 
189 	r = ttm_bo_move_accel_cleanup(bo, &fence->base, evict, false, new_mem);
190 	radeon_fence_unref(&fence);
191 	return r;
192 }
193 
194 static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict,
195 			  struct ttm_operation_ctx *ctx,
196 			  struct ttm_resource *new_mem,
197 			  struct ttm_place *hop)
198 {
199 	struct ttm_resource *old_mem = bo->resource;
200 	struct radeon_device *rdev;
201 	struct radeon_bo *rbo;
202 	int r;
203 
204 	if (new_mem->mem_type == TTM_PL_TT) {
205 		r = radeon_ttm_tt_bind(bo->bdev, bo->ttm, new_mem);
206 		if (r)
207 			return r;
208 	}
209 
210 	r = ttm_bo_wait_ctx(bo, ctx);
211 	if (r)
212 		return r;
213 
214 	/* Can't move a pinned BO */
215 	rbo = container_of(bo, struct radeon_bo, tbo);
216 	if (WARN_ON_ONCE(rbo->tbo.pin_count > 0))
217 		return -EINVAL;
218 
219 	rdev = radeon_get_rdev(bo->bdev);
220 	if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
221 		ttm_bo_move_null(bo, new_mem);
222 		goto out;
223 	}
224 	if (old_mem->mem_type == TTM_PL_SYSTEM &&
225 	    new_mem->mem_type == TTM_PL_TT) {
226 		ttm_bo_move_null(bo, new_mem);
227 		goto out;
228 	}
229 
230 	if (old_mem->mem_type == TTM_PL_TT &&
231 	    new_mem->mem_type == TTM_PL_SYSTEM) {
232 		radeon_ttm_tt_unbind(bo->bdev, bo->ttm);
233 		ttm_resource_free(bo, &bo->resource);
234 		ttm_bo_assign_mem(bo, new_mem);
235 		goto out;
236 	}
237 	if (rdev->ring[radeon_copy_ring_index(rdev)].ready &&
238 	    rdev->asic->copy.copy != NULL) {
239 		if ((old_mem->mem_type == TTM_PL_SYSTEM &&
240 		     new_mem->mem_type == TTM_PL_VRAM) ||
241 		    (old_mem->mem_type == TTM_PL_VRAM &&
242 		     new_mem->mem_type == TTM_PL_SYSTEM)) {
243 			hop->fpfn = 0;
244 			hop->lpfn = 0;
245 			hop->mem_type = TTM_PL_TT;
246 			hop->flags = 0;
247 			return -EMULTIHOP;
248 		}
249 
250 		r = radeon_move_blit(bo, evict, new_mem, old_mem);
251 	} else {
252 		r = -ENODEV;
253 	}
254 
255 	if (r) {
256 		r = ttm_bo_move_memcpy(bo, ctx, new_mem);
257 		if (r)
258 			return r;
259 	}
260 
261 out:
262 	/* update statistics */
263 	atomic64_add(bo->base.size, &rdev->num_bytes_moved);
264 	radeon_bo_move_notify(bo);
265 	return 0;
266 }
267 
268 static int radeon_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *mem)
269 {
270 	struct radeon_device *rdev = radeon_get_rdev(bdev);
271 	size_t bus_size = (size_t)mem->num_pages << PAGE_SHIFT;
272 
273 	switch (mem->mem_type) {
274 	case TTM_PL_SYSTEM:
275 		/* system memory */
276 		return 0;
277 	case TTM_PL_TT:
278 #if IS_ENABLED(CONFIG_AGP)
279 		if (rdev->flags & RADEON_IS_AGP) {
280 			/* RADEON_IS_AGP is set only if AGP is active */
281 			mem->bus.offset = (mem->start << PAGE_SHIFT) +
282 				rdev->mc.agp_base;
283 			mem->bus.is_iomem = !rdev->agp->cant_use_aperture;
284 			mem->bus.caching = ttm_write_combined;
285 		}
286 #endif
287 		break;
288 	case TTM_PL_VRAM:
289 		mem->bus.offset = mem->start << PAGE_SHIFT;
290 		/* check if it's visible */
291 		if ((mem->bus.offset + bus_size) > rdev->mc.visible_vram_size)
292 			return -EINVAL;
293 		mem->bus.offset += rdev->mc.aper_base;
294 		mem->bus.is_iomem = true;
295 		mem->bus.caching = ttm_write_combined;
296 #ifdef __alpha__
297 		/*
298 		 * Alpha: use bus.addr to hold the ioremap() return,
299 		 * so we can modify bus.base below.
300 		 */
301 		mem->bus.addr = ioremap_wc(mem->bus.offset, bus_size);
302 		if (!mem->bus.addr)
303 			return -ENOMEM;
304 
305 		/*
306 		 * Alpha: Use just the bus offset plus
307 		 * the hose/domain memory base for bus.base.
308 		 * It then can be used to build PTEs for VRAM
309 		 * access, as done in ttm_bo_vm_fault().
310 		 */
311 		mem->bus.offset = (mem->bus.offset & 0x0ffffffffUL) +
312 			rdev->hose->dense_mem_base;
313 #endif
314 		break;
315 	default:
316 		return -EINVAL;
317 	}
318 	return 0;
319 }
320 
321 /*
322  * TTM backend functions.
323  */
324 struct radeon_ttm_tt {
325 	struct ttm_tt		ttm;
326 	u64				offset;
327 
328 	uint64_t			userptr;
329 	struct mm_struct		*usermm;
330 	uint32_t			userflags;
331 	bool bound;
332 };
333 
334 /* prepare the sg table with the user pages */
335 static int radeon_ttm_tt_pin_userptr(struct ttm_device *bdev, struct ttm_tt *ttm)
336 {
337 	struct radeon_device *rdev = radeon_get_rdev(bdev);
338 	struct radeon_ttm_tt *gtt = (void *)ttm;
339 	unsigned pinned = 0;
340 	int r;
341 
342 	int write = !(gtt->userflags & RADEON_GEM_USERPTR_READONLY);
343 	enum dma_data_direction direction = write ?
344 		DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
345 
346 	if (current->mm != gtt->usermm)
347 		return -EPERM;
348 
349 	if (gtt->userflags & RADEON_GEM_USERPTR_ANONONLY) {
350 		/* check that we only pin down anonymous memory
351 		   to prevent problems with writeback */
352 		unsigned long end = gtt->userptr + (u64)ttm->num_pages * PAGE_SIZE;
353 		struct vm_area_struct *vma;
354 		vma = find_vma(gtt->usermm, gtt->userptr);
355 		if (!vma || vma->vm_file || vma->vm_end < end)
356 			return -EPERM;
357 	}
358 
359 	do {
360 		unsigned num_pages = ttm->num_pages - pinned;
361 		uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
362 		struct page **pages = ttm->pages + pinned;
363 
364 		r = get_user_pages(userptr, num_pages, write ? FOLL_WRITE : 0,
365 				   pages, NULL);
366 		if (r < 0)
367 			goto release_pages;
368 
369 		pinned += r;
370 
371 	} while (pinned < ttm->num_pages);
372 
373 	r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
374 				      (u64)ttm->num_pages << PAGE_SHIFT,
375 				      GFP_KERNEL);
376 	if (r)
377 		goto release_sg;
378 
379 	r = dma_map_sgtable(rdev->dev, ttm->sg, direction, 0);
380 	if (r)
381 		goto release_sg;
382 
383 	drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,
384 				       ttm->num_pages);
385 
386 	return 0;
387 
388 release_sg:
389 	kfree(ttm->sg);
390 
391 release_pages:
392 	release_pages(ttm->pages, pinned);
393 	return r;
394 }
395 
396 static void radeon_ttm_tt_unpin_userptr(struct ttm_device *bdev, struct ttm_tt *ttm)
397 {
398 	struct radeon_device *rdev = radeon_get_rdev(bdev);
399 	struct radeon_ttm_tt *gtt = (void *)ttm;
400 	struct sg_page_iter sg_iter;
401 
402 	int write = !(gtt->userflags & RADEON_GEM_USERPTR_READONLY);
403 	enum dma_data_direction direction = write ?
404 		DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
405 
406 	/* double check that we don't free the table twice */
407 	if (!ttm->sg || !ttm->sg->sgl)
408 		return;
409 
410 	/* free the sg table and pages again */
411 	dma_unmap_sgtable(rdev->dev, ttm->sg, direction, 0);
412 
413 	for_each_sgtable_page(ttm->sg, &sg_iter, 0) {
414 		struct page *page = sg_page_iter_page(&sg_iter);
415 		if (!(gtt->userflags & RADEON_GEM_USERPTR_READONLY))
416 			set_page_dirty(page);
417 
418 		mark_page_accessed(page);
419 		put_page(page);
420 	}
421 
422 	sg_free_table(ttm->sg);
423 }
424 
425 static bool radeon_ttm_backend_is_bound(struct ttm_tt *ttm)
426 {
427 	struct radeon_ttm_tt *gtt = (void*)ttm;
428 
429 	return (gtt->bound);
430 }
431 
432 static int radeon_ttm_backend_bind(struct ttm_device *bdev,
433 				   struct ttm_tt *ttm,
434 				   struct ttm_resource *bo_mem)
435 {
436 	struct radeon_ttm_tt *gtt = (void*)ttm;
437 	struct radeon_device *rdev = radeon_get_rdev(bdev);
438 	uint32_t flags = RADEON_GART_PAGE_VALID | RADEON_GART_PAGE_READ |
439 		RADEON_GART_PAGE_WRITE;
440 	int r;
441 
442 	if (gtt->bound)
443 		return 0;
444 
445 	if (gtt->userptr) {
446 		radeon_ttm_tt_pin_userptr(bdev, ttm);
447 		flags &= ~RADEON_GART_PAGE_WRITE;
448 	}
449 
450 	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
451 	if (!ttm->num_pages) {
452 		WARN(1, "nothing to bind %u pages for mreg %p back %p!\n",
453 		     ttm->num_pages, bo_mem, ttm);
454 	}
455 	if (ttm->caching == ttm_cached)
456 		flags |= RADEON_GART_PAGE_SNOOP;
457 	r = radeon_gart_bind(rdev, gtt->offset, ttm->num_pages,
458 			     ttm->pages, gtt->ttm.dma_address, flags);
459 	if (r) {
460 		DRM_ERROR("failed to bind %u pages at 0x%08X\n",
461 			  ttm->num_pages, (unsigned)gtt->offset);
462 		return r;
463 	}
464 	gtt->bound = true;
465 	return 0;
466 }
467 
468 static void radeon_ttm_backend_unbind(struct ttm_device *bdev, struct ttm_tt *ttm)
469 {
470 	struct radeon_ttm_tt *gtt = (void *)ttm;
471 	struct radeon_device *rdev = radeon_get_rdev(bdev);
472 
473 	if (gtt->userptr)
474 		radeon_ttm_tt_unpin_userptr(bdev, ttm);
475 
476 	if (!gtt->bound)
477 		return;
478 
479 	radeon_gart_unbind(rdev, gtt->offset, ttm->num_pages);
480 
481 	gtt->bound = false;
482 }
483 
484 static void radeon_ttm_backend_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
485 {
486 	struct radeon_ttm_tt *gtt = (void *)ttm;
487 
488 	ttm_tt_fini(&gtt->ttm);
489 	kfree(gtt);
490 }
491 
492 static struct ttm_tt *radeon_ttm_tt_create(struct ttm_buffer_object *bo,
493 					   uint32_t page_flags)
494 {
495 	struct radeon_ttm_tt *gtt;
496 	enum ttm_caching caching;
497 	struct radeon_bo *rbo;
498 #if IS_ENABLED(CONFIG_AGP)
499 	struct radeon_device *rdev = radeon_get_rdev(bo->bdev);
500 
501 	if (rdev->flags & RADEON_IS_AGP) {
502 		return ttm_agp_tt_create(bo, rdev->agp->bridge, page_flags);
503 	}
504 #endif
505 	rbo = container_of(bo, struct radeon_bo, tbo);
506 
507 	gtt = kzalloc(sizeof(struct radeon_ttm_tt), GFP_KERNEL);
508 	if (gtt == NULL) {
509 		return NULL;
510 	}
511 
512 	if (rbo->flags & RADEON_GEM_GTT_UC)
513 		caching = ttm_uncached;
514 	else if (rbo->flags & RADEON_GEM_GTT_WC)
515 		caching = ttm_write_combined;
516 	else
517 		caching = ttm_cached;
518 
519 	if (ttm_sg_tt_init(&gtt->ttm, bo, page_flags, caching)) {
520 		kfree(gtt);
521 		return NULL;
522 	}
523 	return &gtt->ttm;
524 }
525 
526 static struct radeon_ttm_tt *radeon_ttm_tt_to_gtt(struct radeon_device *rdev,
527 						  struct ttm_tt *ttm)
528 {
529 #if IS_ENABLED(CONFIG_AGP)
530 	if (rdev->flags & RADEON_IS_AGP)
531 		return NULL;
532 #endif
533 
534 	if (!ttm)
535 		return NULL;
536 	return container_of(ttm, struct radeon_ttm_tt, ttm);
537 }
538 
539 static int radeon_ttm_tt_populate(struct ttm_device *bdev,
540 				  struct ttm_tt *ttm,
541 				  struct ttm_operation_ctx *ctx)
542 {
543 	struct radeon_device *rdev = radeon_get_rdev(bdev);
544 	struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(rdev, ttm);
545 	bool slave = !!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL);
546 
547 	if (gtt && gtt->userptr) {
548 		ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
549 		if (!ttm->sg)
550 			return -ENOMEM;
551 
552 		ttm->page_flags |= TTM_TT_FLAG_EXTERNAL;
553 		return 0;
554 	}
555 
556 	if (slave && ttm->sg) {
557 		drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,
558 					       ttm->num_pages);
559 		return 0;
560 	}
561 
562 	return ttm_pool_alloc(&rdev->mman.bdev.pool, ttm, ctx);
563 }
564 
565 static void radeon_ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
566 {
567 	struct radeon_device *rdev = radeon_get_rdev(bdev);
568 	struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(rdev, ttm);
569 	bool slave = !!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL);
570 
571 	radeon_ttm_tt_unbind(bdev, ttm);
572 
573 	if (gtt && gtt->userptr) {
574 		kfree(ttm->sg);
575 		ttm->page_flags &= ~TTM_TT_FLAG_EXTERNAL;
576 		return;
577 	}
578 
579 	if (slave)
580 		return;
581 
582 	return ttm_pool_free(&rdev->mman.bdev.pool, ttm);
583 }
584 
585 int radeon_ttm_tt_set_userptr(struct radeon_device *rdev,
586 			      struct ttm_tt *ttm, uint64_t addr,
587 			      uint32_t flags)
588 {
589 	struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(rdev, ttm);
590 
591 	if (gtt == NULL)
592 		return -EINVAL;
593 
594 	gtt->userptr = addr;
595 	gtt->usermm = current->mm;
596 	gtt->userflags = flags;
597 	return 0;
598 }
599 
600 bool radeon_ttm_tt_is_bound(struct ttm_device *bdev,
601 			    struct ttm_tt *ttm)
602 {
603 #if IS_ENABLED(CONFIG_AGP)
604 	struct radeon_device *rdev = radeon_get_rdev(bdev);
605 	if (rdev->flags & RADEON_IS_AGP)
606 		return ttm_agp_is_bound(ttm);
607 #endif
608 	return radeon_ttm_backend_is_bound(ttm);
609 }
610 
611 static int radeon_ttm_tt_bind(struct ttm_device *bdev,
612 			      struct ttm_tt *ttm,
613 			      struct ttm_resource *bo_mem)
614 {
615 #if IS_ENABLED(CONFIG_AGP)
616 	struct radeon_device *rdev = radeon_get_rdev(bdev);
617 #endif
618 
619 	if (!bo_mem)
620 		return -EINVAL;
621 #if IS_ENABLED(CONFIG_AGP)
622 	if (rdev->flags & RADEON_IS_AGP)
623 		return ttm_agp_bind(ttm, bo_mem);
624 #endif
625 
626 	return radeon_ttm_backend_bind(bdev, ttm, bo_mem);
627 }
628 
629 static void radeon_ttm_tt_unbind(struct ttm_device *bdev,
630 				 struct ttm_tt *ttm)
631 {
632 #if IS_ENABLED(CONFIG_AGP)
633 	struct radeon_device *rdev = radeon_get_rdev(bdev);
634 
635 	if (rdev->flags & RADEON_IS_AGP) {
636 		ttm_agp_unbind(ttm);
637 		return;
638 	}
639 #endif
640 	radeon_ttm_backend_unbind(bdev, ttm);
641 }
642 
643 static void radeon_ttm_tt_destroy(struct ttm_device *bdev,
644 				  struct ttm_tt *ttm)
645 {
646 #if IS_ENABLED(CONFIG_AGP)
647 	struct radeon_device *rdev = radeon_get_rdev(bdev);
648 
649 	if (rdev->flags & RADEON_IS_AGP) {
650 		ttm_agp_destroy(ttm);
651 		return;
652 	}
653 #endif
654 	radeon_ttm_backend_destroy(bdev, ttm);
655 }
656 
657 bool radeon_ttm_tt_has_userptr(struct radeon_device *rdev,
658 			       struct ttm_tt *ttm)
659 {
660 	struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(rdev, ttm);
661 
662 	if (gtt == NULL)
663 		return false;
664 
665 	return !!gtt->userptr;
666 }
667 
668 bool radeon_ttm_tt_is_readonly(struct radeon_device *rdev,
669 			       struct ttm_tt *ttm)
670 {
671 	struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(rdev, ttm);
672 
673 	if (gtt == NULL)
674 		return false;
675 
676 	return !!(gtt->userflags & RADEON_GEM_USERPTR_READONLY);
677 }
678 
679 static struct ttm_device_funcs radeon_bo_driver = {
680 	.ttm_tt_create = &radeon_ttm_tt_create,
681 	.ttm_tt_populate = &radeon_ttm_tt_populate,
682 	.ttm_tt_unpopulate = &radeon_ttm_tt_unpopulate,
683 	.ttm_tt_destroy = &radeon_ttm_tt_destroy,
684 	.eviction_valuable = ttm_bo_eviction_valuable,
685 	.evict_flags = &radeon_evict_flags,
686 	.move = &radeon_bo_move,
687 	.io_mem_reserve = &radeon_ttm_io_mem_reserve,
688 };
689 
690 int radeon_ttm_init(struct radeon_device *rdev)
691 {
692 	int r;
693 
694 	/* No others user of address space so set it to 0 */
695 	r = ttm_device_init(&rdev->mman.bdev, &radeon_bo_driver, rdev->dev,
696 			       rdev->ddev->anon_inode->i_mapping,
697 			       rdev->ddev->vma_offset_manager,
698 			       rdev->need_swiotlb,
699 			       dma_addressing_limited(&rdev->pdev->dev));
700 	if (r) {
701 		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
702 		return r;
703 	}
704 	rdev->mman.initialized = true;
705 
706 	r = radeon_ttm_init_vram(rdev);
707 	if (r) {
708 		DRM_ERROR("Failed initializing VRAM heap.\n");
709 		return r;
710 	}
711 	/* Change the size here instead of the init above so only lpfn is affected */
712 	radeon_ttm_set_active_vram_size(rdev, rdev->mc.visible_vram_size);
713 
714 	r = radeon_bo_create(rdev, 256 * 1024, PAGE_SIZE, true,
715 			     RADEON_GEM_DOMAIN_VRAM, 0, NULL,
716 			     NULL, &rdev->stolen_vga_memory);
717 	if (r) {
718 		return r;
719 	}
720 	r = radeon_bo_reserve(rdev->stolen_vga_memory, false);
721 	if (r)
722 		return r;
723 	r = radeon_bo_pin(rdev->stolen_vga_memory, RADEON_GEM_DOMAIN_VRAM, NULL);
724 	radeon_bo_unreserve(rdev->stolen_vga_memory);
725 	if (r) {
726 		radeon_bo_unref(&rdev->stolen_vga_memory);
727 		return r;
728 	}
729 	DRM_INFO("radeon: %uM of VRAM memory ready\n",
730 		 (unsigned) (rdev->mc.real_vram_size / (1024 * 1024)));
731 
732 	r = radeon_ttm_init_gtt(rdev);
733 	if (r) {
734 		DRM_ERROR("Failed initializing GTT heap.\n");
735 		return r;
736 	}
737 	DRM_INFO("radeon: %uM of GTT memory ready.\n",
738 		 (unsigned)(rdev->mc.gtt_size / (1024 * 1024)));
739 
740 	radeon_ttm_debugfs_init(rdev);
741 
742 	return 0;
743 }
744 
745 void radeon_ttm_fini(struct radeon_device *rdev)
746 {
747 	int r;
748 
749 	if (!rdev->mman.initialized)
750 		return;
751 
752 	if (rdev->stolen_vga_memory) {
753 		r = radeon_bo_reserve(rdev->stolen_vga_memory, false);
754 		if (r == 0) {
755 			radeon_bo_unpin(rdev->stolen_vga_memory);
756 			radeon_bo_unreserve(rdev->stolen_vga_memory);
757 		}
758 		radeon_bo_unref(&rdev->stolen_vga_memory);
759 	}
760 	ttm_range_man_fini(&rdev->mman.bdev, TTM_PL_VRAM);
761 	ttm_range_man_fini(&rdev->mman.bdev, TTM_PL_TT);
762 	ttm_device_fini(&rdev->mman.bdev);
763 	radeon_gart_fini(rdev);
764 	rdev->mman.initialized = false;
765 	DRM_INFO("radeon: ttm finalized\n");
766 }
767 
768 /* this should only be called at bootup or when userspace
769  * isn't running */
770 void radeon_ttm_set_active_vram_size(struct radeon_device *rdev, u64 size)
771 {
772 	struct ttm_resource_manager *man;
773 
774 	if (!rdev->mman.initialized)
775 		return;
776 
777 	man = ttm_manager_type(&rdev->mman.bdev, TTM_PL_VRAM);
778 	/* this just adjusts TTM size idea, which sets lpfn to the correct value */
779 	man->size = size >> PAGE_SHIFT;
780 }
781 
782 #if defined(CONFIG_DEBUG_FS)
783 
784 static int radeon_ttm_page_pool_show(struct seq_file *m, void *data)
785 {
786 	struct radeon_device *rdev = (struct radeon_device *)m->private;
787 
788 	return ttm_pool_debugfs(&rdev->mman.bdev.pool, m);
789 }
790 
791 DEFINE_SHOW_ATTRIBUTE(radeon_ttm_page_pool);
792 
793 static int radeon_ttm_vram_open(struct inode *inode, struct file *filep)
794 {
795 	struct radeon_device *rdev = inode->i_private;
796 	i_size_write(inode, rdev->mc.mc_vram_size);
797 	filep->private_data = inode->i_private;
798 	return 0;
799 }
800 
801 static ssize_t radeon_ttm_vram_read(struct file *f, char __user *buf,
802 				    size_t size, loff_t *pos)
803 {
804 	struct radeon_device *rdev = f->private_data;
805 	ssize_t result = 0;
806 	int r;
807 
808 	if (size & 0x3 || *pos & 0x3)
809 		return -EINVAL;
810 
811 	while (size) {
812 		unsigned long flags;
813 		uint32_t value;
814 
815 		if (*pos >= rdev->mc.mc_vram_size)
816 			return result;
817 
818 		spin_lock_irqsave(&rdev->mmio_idx_lock, flags);
819 		WREG32(RADEON_MM_INDEX, ((uint32_t)*pos) | 0x80000000);
820 		if (rdev->family >= CHIP_CEDAR)
821 			WREG32(EVERGREEN_MM_INDEX_HI, *pos >> 31);
822 		value = RREG32(RADEON_MM_DATA);
823 		spin_unlock_irqrestore(&rdev->mmio_idx_lock, flags);
824 
825 		r = put_user(value, (uint32_t __user *)buf);
826 		if (r)
827 			return r;
828 
829 		result += 4;
830 		buf += 4;
831 		*pos += 4;
832 		size -= 4;
833 	}
834 
835 	return result;
836 }
837 
838 static const struct file_operations radeon_ttm_vram_fops = {
839 	.owner = THIS_MODULE,
840 	.open = radeon_ttm_vram_open,
841 	.read = radeon_ttm_vram_read,
842 	.llseek = default_llseek
843 };
844 
845 static int radeon_ttm_gtt_open(struct inode *inode, struct file *filep)
846 {
847 	struct radeon_device *rdev = inode->i_private;
848 	i_size_write(inode, rdev->mc.gtt_size);
849 	filep->private_data = inode->i_private;
850 	return 0;
851 }
852 
853 static ssize_t radeon_ttm_gtt_read(struct file *f, char __user *buf,
854 				   size_t size, loff_t *pos)
855 {
856 	struct radeon_device *rdev = f->private_data;
857 	ssize_t result = 0;
858 	int r;
859 
860 	while (size) {
861 		loff_t p = *pos / PAGE_SIZE;
862 		unsigned off = *pos & ~PAGE_MASK;
863 		size_t cur_size = min_t(size_t, size, PAGE_SIZE - off);
864 		struct page *page;
865 		void *ptr;
866 
867 		if (p >= rdev->gart.num_cpu_pages)
868 			return result;
869 
870 		page = rdev->gart.pages[p];
871 		if (page) {
872 			ptr = kmap(page);
873 			ptr += off;
874 
875 			r = copy_to_user(buf, ptr, cur_size);
876 			kunmap(rdev->gart.pages[p]);
877 		} else
878 			r = clear_user(buf, cur_size);
879 
880 		if (r)
881 			return -EFAULT;
882 
883 		result += cur_size;
884 		buf += cur_size;
885 		*pos += cur_size;
886 		size -= cur_size;
887 	}
888 
889 	return result;
890 }
891 
892 static const struct file_operations radeon_ttm_gtt_fops = {
893 	.owner = THIS_MODULE,
894 	.open = radeon_ttm_gtt_open,
895 	.read = radeon_ttm_gtt_read,
896 	.llseek = default_llseek
897 };
898 
899 #endif
900 
901 static void radeon_ttm_debugfs_init(struct radeon_device *rdev)
902 {
903 #if defined(CONFIG_DEBUG_FS)
904 	struct drm_minor *minor = rdev->ddev->primary;
905 	struct dentry *root = minor->debugfs_root;
906 
907 	debugfs_create_file("radeon_vram", 0444, root, rdev,
908 			    &radeon_ttm_vram_fops);
909 	debugfs_create_file("radeon_gtt", 0444, root, rdev,
910 			    &radeon_ttm_gtt_fops);
911 	debugfs_create_file("ttm_page_pool", 0444, root, rdev,
912 			    &radeon_ttm_page_pool_fops);
913 	ttm_resource_manager_create_debugfs(ttm_manager_type(&rdev->mman.bdev,
914 							     TTM_PL_VRAM),
915 					    root, "radeon_vram_mm");
916 	ttm_resource_manager_create_debugfs(ttm_manager_type(&rdev->mman.bdev,
917 							     TTM_PL_TT),
918 					    root, "radeon_gtt_mm");
919 #endif
920 }
921