2 * Copyright © 2008-2010 Intel Corporation
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:
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
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
24 * Eric Anholt <eric@anholt.net>
25 * Chris Wilson <chris@chris-wilson.co.uuk>
30 #include <drm/i915_drm.h>
33 #include "intel_drv.h"
34 #include "i915_trace.h"
37 gpu_is_idle(struct drm_i915_private *dev_priv)
39 struct intel_engine_cs *engine;
41 for_each_engine(engine, dev_priv) {
42 if (intel_engine_is_active(engine))
50 mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind)
52 if (i915_vma_is_pinned(vma))
55 if (WARN_ON(!list_empty(&vma->exec_list)))
58 if (flags & PIN_NONFAULT && vma->obj->fault_mappable)
61 list_add(&vma->exec_list, unwind);
62 return drm_mm_scan_add_block(&vma->node);
66 * i915_gem_evict_something - Evict vmas to make room for binding a new one
67 * @vm: address space to evict from
68 * @min_size: size of the desired free space
69 * @alignment: alignment constraint of the desired free space
70 * @cache_level: cache_level for the desired space
71 * @start: start (inclusive) of the range from which to evict objects
72 * @end: end (exclusive) of the range from which to evict objects
73 * @flags: additional flags to control the eviction algorithm
75 * This function will try to evict vmas until a free space satisfying the
76 * requirements is found. Callers must check first whether any such hole exists
77 * already before calling this function.
79 * This function is used by the object/vma binding code.
81 * Since this function is only used to free up virtual address space it only
82 * ignores pinned vmas, and not object where the backing storage itself is
83 * pinned. Hence obj->pages_pin_count does not protect against eviction.
85 * To clarify: This is for freeing up virtual address space, not for freeing
86 * memory in e.g. the shrinker.
89 i915_gem_evict_something(struct i915_address_space *vm,
90 u64 min_size, u64 alignment,
95 struct drm_i915_private *dev_priv = to_i915(vm->dev);
96 struct list_head eviction_list;
97 struct list_head *phases[] = {
102 struct i915_vma *vma, *next;
105 trace_i915_gem_evict(vm, min_size, alignment, flags);
108 * The goal is to evict objects and amalgamate space in LRU order.
109 * The oldest idle objects reside on the inactive list, which is in
110 * retirement order. The next objects to retire are those in flight,
111 * on the active list, again in retirement order.
113 * The retirement sequence is thus:
114 * 1. Inactive objects (already retired)
115 * 2. Active objects (will stall on unbinding)
117 * On each list, the oldest objects lie at the HEAD with the freshest
118 * object on the TAIL.
120 if (start != 0 || end != vm->total) {
121 drm_mm_init_scan_with_range(&vm->mm, min_size,
122 alignment, cache_level,
125 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
127 if (flags & PIN_NONBLOCK)
131 INIT_LIST_HEAD(&eviction_list);
134 list_for_each_entry(vma, *phase, vm_link)
135 if (mark_free(vma, flags, &eviction_list))
139 /* Nothing found, clean up and bail out! */
140 list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
141 ret = drm_mm_scan_remove_block(&vma->node);
144 INIT_LIST_HEAD(&vma->exec_list);
147 /* Can we unpin some objects such as idle hw contents,
148 * or pending flips? But since only the GGTT has global entries
149 * such as scanouts, rinbuffers and contexts, we can skip the
150 * purge when inspecting per-process local address spaces.
152 if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK)
155 if (gpu_is_idle(dev_priv)) {
156 /* If we still have pending pageflip completions, drop
157 * back to userspace to give our workqueues time to
158 * acquire our locks and unpin the old scanouts.
160 return intel_has_pending_fb_unpin(vm->dev) ? -EAGAIN : -ENOSPC;
163 /* Not everything in the GGTT is tracked via vma (otherwise we
164 * could evict as required with minimal stalling) so we are forced
165 * to idle the GPU and explicitly retire outstanding requests in
166 * the hopes that we can then remove contexts and the like only
167 * bound by their active reference.
169 ret = i915_gem_switch_to_kernel_context(dev_priv);
173 ret = i915_gem_wait_for_idle(dev_priv,
174 I915_WAIT_INTERRUPTIBLE |
179 i915_gem_retire_requests(dev_priv);
183 /* drm_mm doesn't allow any other other operations while
184 * scanning, therefore store to-be-evicted objects on a
185 * temporary list and take a reference for all before
186 * calling unbind (which may remove the active reference
187 * of any of our objects, thus corrupting the list).
189 list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
190 if (drm_mm_scan_remove_block(&vma->node))
193 list_del_init(&vma->exec_list);
196 /* Unbinding will emit any required flushes */
197 while (!list_empty(&eviction_list)) {
198 vma = list_first_entry(&eviction_list,
202 list_del_init(&vma->exec_list);
203 __i915_vma_unpin(vma);
205 ret = i915_vma_unbind(vma);
211 i915_gem_evict_for_vma(struct i915_vma *target)
213 struct drm_mm_node *node, *next;
215 list_for_each_entry_safe(node, next,
216 &target->vm->mm.head_node.node_list,
218 struct i915_vma *vma;
221 if (node->start + node->size <= target->node.start)
223 if (node->start >= target->node.start + target->node.size)
226 vma = container_of(node, typeof(*vma), node);
228 if (i915_vma_is_pinned(vma)) {
229 if (!vma->exec_entry || i915_vma_pin_count(vma) > 1)
230 /* Object is pinned for some other use */
233 /* We need to evict a buffer in the same batch */
234 if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
235 /* Overlapping fixed objects in the same batch */
241 ret = i915_vma_unbind(vma);
250 * i915_gem_evict_vm - Evict all idle vmas from a vm
251 * @vm: Address space to cleanse
252 * @do_idle: Boolean directing whether to idle first.
254 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
255 * evicted the @do_idle needs to be set to true.
257 * This is used by the execbuf code as a last-ditch effort to defragment the
260 * To clarify: This is for freeing up virtual address space, not for freeing
261 * memory in e.g. the shrinker.
263 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
265 struct i915_vma *vma, *next;
268 WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
269 trace_i915_gem_evict_vm(vm);
272 struct drm_i915_private *dev_priv = to_i915(vm->dev);
274 if (i915_is_ggtt(vm)) {
275 ret = i915_gem_switch_to_kernel_context(dev_priv);
280 ret = i915_gem_wait_for_idle(dev_priv,
281 I915_WAIT_INTERRUPTIBLE |
286 i915_gem_retire_requests(dev_priv);
287 WARN_ON(!list_empty(&vm->active_list));
290 list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
291 if (!i915_vma_is_pinned(vma))
292 WARN_ON(i915_vma_unbind(vma));