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 mark_free(struct i915_vma
*vma
, struct list_head
*unwind
)
42 if (WARN_ON(!list_empty(&vma
->exec_list
)))
45 list_add(&vma
->exec_list
, unwind
);
46 return drm_mm_scan_add_block(&vma
->node
);
50 * i915_gem_evict_something - Evict vmas to make room for binding a new one
52 * @vm: address space to evict from
53 * @min_size: size of the desired free space
54 * @alignment: alignment constraint of the desired free space
55 * @cache_level: cache_level for the desired space
56 * @start: start (inclusive) of the range from which to evict objects
57 * @end: end (exclusive) of the range from which to evict objects
58 * @flags: additional flags to control the eviction algorithm
60 * This function will try to evict vmas until a free space satisfying the
61 * requirements is found. Callers must check first whether any such hole exists
62 * already before calling this function.
64 * This function is used by the object/vma binding code.
66 * Since this function is only used to free up virtual address space it only
67 * ignores pinned vmas, and not object where the backing storage itself is
68 * pinned. Hence obj->pages_pin_count does not protect against eviction.
70 * To clarify: This is for freeing up virtual address space, not for freeing
71 * memory in e.g. the shrinker.
74 i915_gem_evict_something(struct drm_device
*dev
, struct i915_address_space
*vm
,
75 int min_size
, unsigned alignment
, unsigned cache_level
,
76 unsigned long start
, unsigned long end
,
79 struct list_head eviction_list
, unwind_list
;
84 trace_i915_gem_evict(dev
, min_size
, alignment
, flags
);
87 * The goal is to evict objects and amalgamate space in LRU order.
88 * The oldest idle objects reside on the inactive list, which is in
89 * retirement order. The next objects to retire are those on the (per
90 * ring) active list that do not have an outstanding flush. Once the
91 * hardware reports completion (the seqno is updated after the
92 * batchbuffer has been finished) the clean buffer objects would
93 * be retired to the inactive list. Any dirty objects would be added
94 * to the tail of the flushing list. So after processing the clean
95 * active objects we need to emit a MI_FLUSH to retire the flushing
96 * list, hence the retirement order of the flushing list is in
97 * advance of the dirty objects on the active lists.
99 * The retirement sequence is thus:
100 * 1. Inactive objects (already retired)
101 * 2. Clean active objects
103 * 4. Dirty active objects.
105 * On each list, the oldest objects lie at the HEAD with the freshest
106 * object on the TAIL.
109 INIT_LIST_HEAD(&unwind_list
);
110 if (start
!= 0 || end
!= vm
->total
) {
111 drm_mm_init_scan_with_range(&vm
->mm
, min_size
,
112 alignment
, cache_level
,
115 drm_mm_init_scan(&vm
->mm
, min_size
, alignment
, cache_level
);
118 /* First see if there is a large enough contiguous idle region... */
119 list_for_each_entry(vma
, &vm
->inactive_list
, mm_list
) {
120 if (mark_free(vma
, &unwind_list
))
124 if (flags
& PIN_NONBLOCK
)
127 /* Now merge in the soon-to-be-expired objects... */
128 list_for_each_entry(vma
, &vm
->active_list
, mm_list
) {
129 if (mark_free(vma
, &unwind_list
))
134 /* Nothing found, clean up and bail out! */
135 while (!list_empty(&unwind_list
)) {
136 vma
= list_first_entry(&unwind_list
,
139 ret
= drm_mm_scan_remove_block(&vma
->node
);
142 list_del_init(&vma
->exec_list
);
145 /* Can we unpin some objects such as idle hw contents,
148 if (flags
& PIN_NONBLOCK
)
151 /* Only idle the GPU and repeat the search once */
153 ret
= i915_gpu_idle(dev
);
157 i915_gem_retire_requests(dev
);
161 /* If we still have pending pageflip completions, drop
162 * back to userspace to give our workqueues time to
163 * acquire our locks and unpin the old scanouts.
165 return intel_has_pending_fb_unpin(dev
) ? -EAGAIN
: -ENOSPC
;
168 /* drm_mm doesn't allow any other other operations while
169 * scanning, therefore store to be evicted objects on a
171 INIT_LIST_HEAD(&eviction_list
);
172 while (!list_empty(&unwind_list
)) {
173 vma
= list_first_entry(&unwind_list
,
176 if (drm_mm_scan_remove_block(&vma
->node
)) {
177 list_move(&vma
->exec_list
, &eviction_list
);
178 drm_gem_object_reference(&vma
->obj
->base
);
181 list_del_init(&vma
->exec_list
);
184 /* Unbinding will emit any required flushes */
185 while (!list_empty(&eviction_list
)) {
186 struct drm_gem_object
*obj
;
187 vma
= list_first_entry(&eviction_list
,
191 obj
= &vma
->obj
->base
;
192 list_del_init(&vma
->exec_list
);
194 ret
= i915_vma_unbind(vma
);
196 drm_gem_object_unreference(obj
);
203 * i915_gem_evict_vm - Evict all idle vmas from a vm
204 * @vm: Address space to cleanse
205 * @do_idle: Boolean directing whether to idle first.
207 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
208 * evicted the @do_idle needs to be set to true.
210 * This is used by the execbuf code as a last-ditch effort to defragment the
213 * To clarify: This is for freeing up virtual address space, not for freeing
214 * memory in e.g. the shrinker.
216 int i915_gem_evict_vm(struct i915_address_space
*vm
, bool do_idle
)
218 struct i915_vma
*vma
, *next
;
221 WARN_ON(!mutex_is_locked(&vm
->dev
->struct_mutex
));
222 trace_i915_gem_evict_vm(vm
);
225 ret
= i915_gpu_idle(vm
->dev
);
229 i915_gem_retire_requests(vm
->dev
);
231 WARN_ON(!list_empty(&vm
->active_list
));
234 list_for_each_entry_safe(vma
, next
, &vm
->inactive_list
, mm_list
)
235 if (vma
->pin_count
== 0)
236 WARN_ON(i915_vma_unbind(vma
));
242 * i915_gem_evict_everything - Try to evict all objects
243 * @dev: Device to evict objects for
245 * This functions tries to evict all gem objects from all address spaces. Used
246 * by the shrinker as a last-ditch effort and for suspend, before releasing the
247 * backing storage of all unbound objects.
250 i915_gem_evict_everything(struct drm_device
*dev
)
252 struct drm_i915_private
*dev_priv
= dev
->dev_private
;
253 struct i915_address_space
*vm
, *v
;
254 bool lists_empty
= true;
257 list_for_each_entry(vm
, &dev_priv
->vm_list
, global_link
) {
258 lists_empty
= (list_empty(&vm
->inactive_list
) &&
259 list_empty(&vm
->active_list
));
267 trace_i915_gem_evict_everything(dev
);
269 /* The gpu_idle will flush everything in the write domain to the
270 * active list. Then we must move everything off the active list
271 * with retire requests.
273 ret
= i915_gpu_idle(dev
);
277 i915_gem_retire_requests(dev
);
279 /* Having flushed everything, unbind() should never raise an error */
280 list_for_each_entry_safe(vm
, v
, &dev_priv
->vm_list
, global_link
)
281 WARN_ON(i915_gem_evict_vm(vm
, false));