1 // SPDX-License-Identifier: MIT
7 #include <linux/slab.h> /* fault-inject.h is not standalone! */
9 #include <linux/fault-inject.h>
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()
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)
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()
129 static u64 random_offset(u64 start, u64 end, u64 len, u64 align)  in random_offset()  argument
133 	GEM_BUG_ON(range_overflows(start, len, end));  in random_offset()
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()
151 	return 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
167  * @end: end of any range restriction inside GTT (U64_MAX for all),
173  * its @size must then fit entirely within the [@start, @end] bounds. The
186  * Returns: 0 on success, -ENOSPC if no suitable hole is found, -EINTR if
193 			u64 start, u64 end, unsigned int flags)  in i915_gem_gtt_insert()  argument
199 	lockdep_assert_held(&vm->mutex);  in i915_gem_gtt_insert()
205 	GEM_BUG_ON(start >= end);  in i915_gem_gtt_insert()
207 	GEM_BUG_ON(end < U64_MAX && !IS_ALIGNED(end, I915_GTT_PAGE_SIZE));  in i915_gem_gtt_insert()
208 	GEM_BUG_ON(vm == &to_gt(vm->i915)->ggtt->alias->vm);  in i915_gem_gtt_insert()
211 	if (unlikely(range_overflows(start, size, end)))  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()
233 	err = drm_mm_insert_node_in_range(&vm->mm, node,  in i915_gem_gtt_insert()
235 					  start, end, mode);  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()
242 						  start, end,  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()
274 	offset = random_offset(start, end,  in i915_gem_gtt_insert()
277 	if (err != -ENOSPC)  in i915_gem_gtt_insert()
281 		return -ENOSPC;  in i915_gem_gtt_insert()
285 				       start, end, flags);  in i915_gem_gtt_insert()
289 	return drm_mm_insert_node_in_range(&vm->mm, node,  in i915_gem_gtt_insert()
291 					   start, end, DRM_MM_INSERT_EVICT);  in i915_gem_gtt_insert()