1 // SPDX-License-Identifier: MIT
7 #include <linux/slab.h> /* fault-inject.h is not standalone! */
9 #include <linux/fault-inject.h>
28 			       struct sg_table *pages)  in i915_gem_gtt_prepare_pages()  argument
31 		if (dma_map_sg_attrs(obj->base.dev->dev,  in i915_gem_gtt_prepare_pages()
32 				     pages->sgl, pages->nents,  in i915_gem_gtt_prepare_pages()
43 		 * try again - if there are no more pages to remove from  in i915_gem_gtt_prepare_pages()
46 		GEM_BUG_ON(obj->mm.pages == pages);  in i915_gem_gtt_prepare_pages()
47 	} while (i915_gem_shrink(NULL, to_i915(obj->base.dev),  in i915_gem_gtt_prepare_pages()
48 				 obj->base.size >> PAGE_SHIFT, NULL,  in i915_gem_gtt_prepare_pages()
52 	return -ENOSPC;  in i915_gem_gtt_prepare_pages()
56 			       struct sg_table *pages)  in i915_gem_gtt_finish_pages()  argument
58 	struct drm_i915_private *i915 = to_i915(obj->base.dev);  in i915_gem_gtt_finish_pages()
59 	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;  in i915_gem_gtt_finish_pages()
62 	if (unlikely(ggtt->do_idle_maps))  in i915_gem_gtt_finish_pages()
66 	dma_unmap_sg(i915->drm.dev, pages->sgl, pages->nents,  in i915_gem_gtt_finish_pages()
71  * i915_gem_gtt_reserve - reserve a node in an address_space (GTT)
87  * neighbouring nodes if the colors do not match (to ensure guard pages between
93  * Returns: 0 on success, -ENOSPC if no suitable hole is found, -EINTR if
107 	GEM_BUG_ON(range_overflows(offset, size, vm->total));  in i915_gem_gtt_reserve()
108 	GEM_BUG_ON(vm == &to_gt(vm->i915)->ggtt->alias->vm);  in i915_gem_gtt_reserve()
111 	node->size = size;  in i915_gem_gtt_reserve()
112 	node->start = offset;  in i915_gem_gtt_reserve()
113 	node->color = color;  in i915_gem_gtt_reserve()
115 	err = drm_mm_reserve_node(&vm->mm, node);  in i915_gem_gtt_reserve()
116 	if (err != -ENOSPC)  in i915_gem_gtt_reserve()
120 		return -ENOSPC;  in i915_gem_gtt_reserve()
124 		err = drm_mm_reserve_node(&vm->mm, node);  in i915_gem_gtt_reserve()
134 	GEM_BUG_ON(round_up(start, align) > round_down(end - len, align));  in random_offset()
136 	range = round_down(end - len, align) - round_up(start, align);  in random_offset()
155  * i915_gem_gtt_insert - insert a node into an address_space (GTT)
162  *             if specified, this must be a power-of-two and at least
174  * nodes on either side of the hole must match @color, or else a guard page
180  * rebound before any future use). Any node that is currently pinned cannot
186  * Returns: 0 on success, -ENOSPC if no suitable hole is found, -EINTR if
199 	lockdep_assert_held(&vm->mutex);  in i915_gem_gtt_insert()
208 	GEM_BUG_ON(vm == &to_gt(vm->i915)->ggtt->alias->vm);  in i915_gem_gtt_insert()
212 		return -ENOSPC;  in i915_gem_gtt_insert()
214 	if (unlikely(round_up(start, alignment) > round_down(end - size, alignment)))  in i915_gem_gtt_insert()
215 		return -ENOSPC;  in i915_gem_gtt_insert()
226 	 * with zero alignment, so where possible use the optimal  in i915_gem_gtt_insert()
233 	err = drm_mm_insert_node_in_range(&vm->mm, node,  in i915_gem_gtt_insert()
236 	if (err != -ENOSPC)  in i915_gem_gtt_insert()
240 		err = drm_mm_insert_node_in_range(&vm->mm, node,  in i915_gem_gtt_insert()
244 		if (err != -ENOSPC)  in i915_gem_gtt_insert()
249 		return -ENOSPC;  in i915_gem_gtt_insert()
255 	 * mmap and GPU (i.e. ggtt/aliasing_ppgtt but not full-ppgtt):  in i915_gem_gtt_insert()
257 	 *    |<-- 256 MiB aperture -->||<-- 1792 MiB unmappable -->|  in i915_gem_gtt_insert()
260 	 * Now imagine that the eviction LRU is ordered top-down (just because  in i915_gem_gtt_insert()
267 	 * On a full-ppgtt system, if we have run out of available space, there  in i915_gem_gtt_insert()
277 	if (err != -ENOSPC)  in i915_gem_gtt_insert()
281 		return -ENOSPC;  in i915_gem_gtt_insert()
289 	return drm_mm_insert_node_in_range(&vm->mm, node,  in i915_gem_gtt_insert()