]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/gpu/drm/i915/i915_gem_evict.c
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"
36 static bool ggtt_is_idle(struct drm_i915_private
*dev_priv
)
38 struct i915_ggtt
*ggtt
= &dev_priv
->ggtt
;
39 struct intel_engine_cs
*engine
;
40 enum intel_engine_id id
;
42 for_each_engine(engine
, dev_priv
, id
) {
43 struct intel_timeline
*tl
;
45 tl
= &ggtt
->base
.timeline
.engine
[engine
->id
];
46 if (i915_gem_active_isset(&tl
->last_request
))
54 mark_free(struct drm_mm_scan
*scan
,
57 struct list_head
*unwind
)
59 if (i915_vma_is_pinned(vma
))
62 if (WARN_ON(!list_empty(&vma
->exec_list
)))
65 if (flags
& PIN_NONFAULT
&& !list_empty(&vma
->obj
->userfault_link
))
68 list_add(&vma
->exec_list
, unwind
);
69 return drm_mm_scan_add_block(scan
, &vma
->node
);
73 * i915_gem_evict_something - Evict vmas to make room for binding a new one
74 * @vm: address space to evict from
75 * @min_size: size of the desired free space
76 * @alignment: alignment constraint of the desired free space
77 * @cache_level: cache_level for the desired space
78 * @start: start (inclusive) of the range from which to evict objects
79 * @end: end (exclusive) of the range from which to evict objects
80 * @flags: additional flags to control the eviction algorithm
82 * This function will try to evict vmas until a free space satisfying the
83 * requirements is found. Callers must check first whether any such hole exists
84 * already before calling this function.
86 * This function is used by the object/vma binding code.
88 * Since this function is only used to free up virtual address space it only
89 * ignores pinned vmas, and not object where the backing storage itself is
90 * pinned. Hence obj->pages_pin_count does not protect against eviction.
92 * To clarify: This is for freeing up virtual address space, not for freeing
93 * memory in e.g. the shrinker.
96 i915_gem_evict_something(struct i915_address_space
*vm
,
97 u64 min_size
, u64 alignment
,
102 struct drm_i915_private
*dev_priv
= vm
->i915
;
103 struct drm_mm_scan scan
;
104 struct list_head eviction_list
;
105 struct list_head
*phases
[] = {
110 struct i915_vma
*vma
, *next
;
111 struct drm_mm_node
*node
;
112 enum drm_mm_insert_mode mode
;
115 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
116 trace_i915_gem_evict(vm
, min_size
, alignment
, flags
);
119 * The goal is to evict objects and amalgamate space in LRU order.
120 * The oldest idle objects reside on the inactive list, which is in
121 * retirement order. The next objects to retire are those in flight,
122 * on the active list, again in retirement order.
124 * The retirement sequence is thus:
125 * 1. Inactive objects (already retired)
126 * 2. Active objects (will stall on unbinding)
128 * On each list, the oldest objects lie at the HEAD with the freshest
129 * object on the TAIL.
131 mode
= DRM_MM_INSERT_BEST
;
132 if (flags
& PIN_HIGH
)
133 mode
= DRM_MM_INSERT_HIGH
;
134 if (flags
& PIN_MAPPABLE
)
135 mode
= DRM_MM_INSERT_LOW
;
136 drm_mm_scan_init_with_range(&scan
, &vm
->mm
,
137 min_size
, alignment
, cache_level
,
140 /* Retire before we search the active list. Although we have
141 * reasonable accuracy in our retirement lists, we may have
142 * a stray pin (preventing eviction) that can only be resolved by
145 if (!(flags
& PIN_NONBLOCK
))
146 i915_gem_retire_requests(dev_priv
);
151 INIT_LIST_HEAD(&eviction_list
);
154 list_for_each_entry(vma
, *phase
, vm_link
)
155 if (mark_free(&scan
, vma
, flags
, &eviction_list
))
159 /* Nothing found, clean up and bail out! */
160 list_for_each_entry_safe(vma
, next
, &eviction_list
, exec_list
) {
161 ret
= drm_mm_scan_remove_block(&scan
, &vma
->node
);
164 INIT_LIST_HEAD(&vma
->exec_list
);
167 /* Can we unpin some objects such as idle hw contents,
168 * or pending flips? But since only the GGTT has global entries
169 * such as scanouts, rinbuffers and contexts, we can skip the
170 * purge when inspecting per-process local address spaces.
172 if (!i915_is_ggtt(vm
) || flags
& PIN_NONBLOCK
)
175 if (ggtt_is_idle(dev_priv
)) {
176 /* If we still have pending pageflip completions, drop
177 * back to userspace to give our workqueues time to
178 * acquire our locks and unpin the old scanouts.
180 return intel_has_pending_fb_unpin(dev_priv
) ? -EAGAIN
: -ENOSPC
;
183 /* Not everything in the GGTT is tracked via vma (otherwise we
184 * could evict as required with minimal stalling) so we are forced
185 * to idle the GPU and explicitly retire outstanding requests in
186 * the hopes that we can then remove contexts and the like only
187 * bound by their active reference.
189 ret
= i915_gem_switch_to_kernel_context(dev_priv
);
193 ret
= i915_gem_wait_for_idle(dev_priv
,
194 I915_WAIT_INTERRUPTIBLE
|
199 i915_gem_retire_requests(dev_priv
);
203 /* drm_mm doesn't allow any other other operations while
204 * scanning, therefore store to-be-evicted objects on a
205 * temporary list and take a reference for all before
206 * calling unbind (which may remove the active reference
207 * of any of our objects, thus corrupting the list).
209 list_for_each_entry_safe(vma
, next
, &eviction_list
, exec_list
) {
210 if (drm_mm_scan_remove_block(&scan
, &vma
->node
))
213 list_del_init(&vma
->exec_list
);
216 /* Unbinding will emit any required flushes */
218 while (!list_empty(&eviction_list
)) {
219 vma
= list_first_entry(&eviction_list
,
223 list_del_init(&vma
->exec_list
);
224 __i915_vma_unpin(vma
);
226 ret
= i915_vma_unbind(vma
);
229 while (ret
== 0 && (node
= drm_mm_scan_color_evict(&scan
))) {
230 vma
= container_of(node
, struct i915_vma
, node
);
231 ret
= i915_vma_unbind(vma
);
238 * i915_gem_evict_for_vma - Evict vmas to make room for binding a new one
239 * @vm: address space to evict from
240 * @target: range (and color) to evict for
241 * @flags: additional flags to control the eviction algorithm
243 * This function will try to evict vmas that overlap the target node.
245 * To clarify: This is for freeing up virtual address space, not for freeing
246 * memory in e.g. the shrinker.
248 int i915_gem_evict_for_node(struct i915_address_space
*vm
,
249 struct drm_mm_node
*target
,
252 LIST_HEAD(eviction_list
);
253 struct drm_mm_node
*node
;
254 u64 start
= target
->start
;
255 u64 end
= start
+ target
->size
;
256 struct i915_vma
*vma
, *next
;
260 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
261 trace_i915_gem_evict_node(vm
, target
, flags
);
263 /* Retire before we search the active list. Although we have
264 * reasonable accuracy in our retirement lists, we may have
265 * a stray pin (preventing eviction) that can only be resolved by
268 if (!(flags
& PIN_NONBLOCK
))
269 i915_gem_retire_requests(vm
->i915
);
271 check_color
= vm
->mm
.color_adjust
;
273 /* Expand search to cover neighbouring guard pages (or lack!) */
274 if (start
> vm
->start
)
275 start
-= I915_GTT_PAGE_SIZE
;
276 if (end
< vm
->start
+ vm
->total
)
277 end
+= I915_GTT_PAGE_SIZE
;
280 drm_mm_for_each_node_in_range(node
, &vm
->mm
, start
, end
) {
281 /* If we find any non-objects (!vma), we cannot evict them */
282 if (node
->color
== I915_COLOR_UNEVICTABLE
) {
287 vma
= container_of(node
, typeof(*vma
), node
);
289 /* If we are using coloring to insert guard pages between
290 * different cache domains within the address space, we have
291 * to check whether the objects on either side of our range
292 * abutt and conflict. If they are in conflict, then we evict
293 * those as well to make room for our guard pages.
296 if (vma
->node
.start
+ vma
->node
.size
== node
->start
) {
297 if (vma
->node
.color
== node
->color
)
300 if (vma
->node
.start
== node
->start
+ node
->size
) {
301 if (vma
->node
.color
== node
->color
)
306 if (flags
& PIN_NONBLOCK
&&
307 (i915_vma_is_pinned(vma
) || i915_vma_is_active(vma
))) {
312 /* Overlap of objects in the same batch? */
313 if (i915_vma_is_pinned(vma
) || !list_empty(&vma
->exec_list
)) {
315 if (vma
->exec_entry
&&
316 vma
->exec_entry
->flags
& EXEC_OBJECT_PINNED
)
321 /* Never show fear in the face of dragons!
323 * We cannot directly remove this node from within this
324 * iterator and as with i915_gem_evict_something() we employ
325 * the vma pin_count in order to prevent the action of
326 * unbinding one vma from freeing (by dropping its active
327 * reference) another in our eviction list.
330 list_add(&vma
->exec_list
, &eviction_list
);
333 list_for_each_entry_safe(vma
, next
, &eviction_list
, exec_list
) {
334 list_del_init(&vma
->exec_list
);
335 __i915_vma_unpin(vma
);
337 ret
= i915_vma_unbind(vma
);
344 * i915_gem_evict_vm - Evict all idle vmas from a vm
345 * @vm: Address space to cleanse
346 * @do_idle: Boolean directing whether to idle first.
348 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
349 * evicted the @do_idle needs to be set to true.
351 * This is used by the execbuf code as a last-ditch effort to defragment the
354 * To clarify: This is for freeing up virtual address space, not for freeing
355 * memory in e.g. the shrinker.
357 int i915_gem_evict_vm(struct i915_address_space
*vm
, bool do_idle
)
359 struct i915_vma
*vma
, *next
;
362 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
363 trace_i915_gem_evict_vm(vm
);
366 struct drm_i915_private
*dev_priv
= vm
->i915
;
368 if (i915_is_ggtt(vm
)) {
369 ret
= i915_gem_switch_to_kernel_context(dev_priv
);
374 ret
= i915_gem_wait_for_idle(dev_priv
,
375 I915_WAIT_INTERRUPTIBLE
|
380 i915_gem_retire_requests(dev_priv
);
381 WARN_ON(!list_empty(&vm
->active_list
));
384 list_for_each_entry_safe(vma
, next
, &vm
->inactive_list
, vm_link
)
385 if (!i915_vma_is_pinned(vma
))
386 WARN_ON(i915_vma_unbind(vma
));