]>
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
))
53 static int ggtt_flush(struct drm_i915_private
*i915
)
57 /* Not everything in the GGTT is tracked via vma (otherwise we
58 * could evict as required with minimal stalling) so we are forced
59 * to idle the GPU and explicitly retire outstanding requests in
60 * the hopes that we can then remove contexts and the like only
61 * bound by their active reference.
63 err
= i915_gem_switch_to_kernel_context(i915
);
67 err
= i915_gem_wait_for_idle(i915
,
68 I915_WAIT_INTERRUPTIBLE
|
77 mark_free(struct drm_mm_scan
*scan
,
80 struct list_head
*unwind
)
82 if (i915_vma_is_pinned(vma
))
85 if (flags
& PIN_NONFAULT
&& i915_vma_has_userfault(vma
))
88 list_add(&vma
->evict_link
, unwind
);
89 return drm_mm_scan_add_block(scan
, &vma
->node
);
93 * i915_gem_evict_something - Evict vmas to make room for binding a new one
94 * @vm: address space to evict from
95 * @min_size: size of the desired free space
96 * @alignment: alignment constraint of the desired free space
97 * @cache_level: cache_level for the desired space
98 * @start: start (inclusive) of the range from which to evict objects
99 * @end: end (exclusive) of the range from which to evict objects
100 * @flags: additional flags to control the eviction algorithm
102 * This function will try to evict vmas until a free space satisfying the
103 * requirements is found. Callers must check first whether any such hole exists
104 * already before calling this function.
106 * This function is used by the object/vma binding code.
108 * Since this function is only used to free up virtual address space it only
109 * ignores pinned vmas, and not object where the backing storage itself is
110 * pinned. Hence obj->pages_pin_count does not protect against eviction.
112 * To clarify: This is for freeing up virtual address space, not for freeing
113 * memory in e.g. the shrinker.
116 i915_gem_evict_something(struct i915_address_space
*vm
,
117 u64 min_size
, u64 alignment
,
118 unsigned cache_level
,
122 struct drm_i915_private
*dev_priv
= vm
->i915
;
123 struct drm_mm_scan scan
;
124 struct list_head eviction_list
;
125 struct list_head
*phases
[] = {
130 struct i915_vma
*vma
, *next
;
131 struct drm_mm_node
*node
;
132 enum drm_mm_insert_mode mode
;
135 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
136 trace_i915_gem_evict(vm
, min_size
, alignment
, flags
);
139 * The goal is to evict objects and amalgamate space in LRU order.
140 * The oldest idle objects reside on the inactive list, which is in
141 * retirement order. The next objects to retire are those in flight,
142 * on the active list, again in retirement order.
144 * The retirement sequence is thus:
145 * 1. Inactive objects (already retired)
146 * 2. Active objects (will stall on unbinding)
148 * On each list, the oldest objects lie at the HEAD with the freshest
149 * object on the TAIL.
151 mode
= DRM_MM_INSERT_BEST
;
152 if (flags
& PIN_HIGH
)
153 mode
= DRM_MM_INSERT_HIGH
;
154 if (flags
& PIN_MAPPABLE
)
155 mode
= DRM_MM_INSERT_LOW
;
156 drm_mm_scan_init_with_range(&scan
, &vm
->mm
,
157 min_size
, alignment
, cache_level
,
160 /* Retire before we search the active list. Although we have
161 * reasonable accuracy in our retirement lists, we may have
162 * a stray pin (preventing eviction) that can only be resolved by
165 if (!(flags
& PIN_NONBLOCK
))
166 i915_gem_retire_requests(dev_priv
);
171 INIT_LIST_HEAD(&eviction_list
);
174 list_for_each_entry(vma
, *phase
, vm_link
)
175 if (mark_free(&scan
, vma
, flags
, &eviction_list
))
179 /* Nothing found, clean up and bail out! */
180 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
181 ret
= drm_mm_scan_remove_block(&scan
, &vma
->node
);
185 /* Can we unpin some objects such as idle hw contents,
186 * or pending flips? But since only the GGTT has global entries
187 * such as scanouts, rinbuffers and contexts, we can skip the
188 * purge when inspecting per-process local address spaces.
190 if (!i915_is_ggtt(vm
) || flags
& PIN_NONBLOCK
)
193 if (ggtt_is_idle(dev_priv
)) {
194 /* If we still have pending pageflip completions, drop
195 * back to userspace to give our workqueues time to
196 * acquire our locks and unpin the old scanouts.
198 return intel_has_pending_fb_unpin(dev_priv
) ? -EAGAIN
: -ENOSPC
;
201 ret
= ggtt_flush(dev_priv
);
208 /* drm_mm doesn't allow any other other operations while
209 * scanning, therefore store to-be-evicted objects on a
210 * temporary list and take a reference for all before
211 * calling unbind (which may remove the active reference
212 * of any of our objects, thus corrupting the list).
214 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
215 if (drm_mm_scan_remove_block(&scan
, &vma
->node
))
218 list_del(&vma
->evict_link
);
221 /* Unbinding will emit any required flushes */
223 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
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 GEM_BUG_ON(!IS_ALIGNED(start
, I915_GTT_PAGE_SIZE
));
262 GEM_BUG_ON(!IS_ALIGNED(end
, I915_GTT_PAGE_SIZE
));
264 trace_i915_gem_evict_node(vm
, target
, flags
);
266 /* Retire before we search the active list. Although we have
267 * reasonable accuracy in our retirement lists, we may have
268 * a stray pin (preventing eviction) that can only be resolved by
271 if (!(flags
& PIN_NONBLOCK
))
272 i915_gem_retire_requests(vm
->i915
);
274 check_color
= vm
->mm
.color_adjust
;
276 /* Expand search to cover neighbouring guard pages (or lack!) */
278 start
-= I915_GTT_PAGE_SIZE
;
280 /* Always look at the page afterwards to avoid the end-of-GTT */
281 end
+= I915_GTT_PAGE_SIZE
;
283 GEM_BUG_ON(start
>= end
);
285 drm_mm_for_each_node_in_range(node
, &vm
->mm
, start
, end
) {
286 /* If we find any non-objects (!vma), we cannot evict them */
287 if (node
->color
== I915_COLOR_UNEVICTABLE
) {
292 GEM_BUG_ON(!node
->allocated
);
293 vma
= container_of(node
, typeof(*vma
), node
);
295 /* If we are using coloring to insert guard pages between
296 * different cache domains within the address space, we have
297 * to check whether the objects on either side of our range
298 * abutt and conflict. If they are in conflict, then we evict
299 * those as well to make room for our guard pages.
302 if (node
->start
+ node
->size
== target
->start
) {
303 if (node
->color
== target
->color
)
306 if (node
->start
== target
->start
+ target
->size
) {
307 if (node
->color
== target
->color
)
312 if (flags
& PIN_NONBLOCK
&&
313 (i915_vma_is_pinned(vma
) || i915_vma_is_active(vma
))) {
318 if (flags
& PIN_NONFAULT
&& i915_vma_has_userfault(vma
)) {
323 /* Overlap of objects in the same batch? */
324 if (i915_vma_is_pinned(vma
)) {
326 if (vma
->exec_flags
&&
327 *vma
->exec_flags
& EXEC_OBJECT_PINNED
)
332 /* Never show fear in the face of dragons!
334 * We cannot directly remove this node from within this
335 * iterator and as with i915_gem_evict_something() we employ
336 * the vma pin_count in order to prevent the action of
337 * unbinding one vma from freeing (by dropping its active
338 * reference) another in our eviction list.
341 list_add(&vma
->evict_link
, &eviction_list
);
344 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
345 __i915_vma_unpin(vma
);
347 ret
= i915_vma_unbind(vma
);
354 * i915_gem_evict_vm - Evict all idle vmas from a vm
355 * @vm: Address space to cleanse
357 * This function evicts all vmas from a vm.
359 * This is used by the execbuf code as a last-ditch effort to defragment the
362 * To clarify: This is for freeing up virtual address space, not for freeing
363 * memory in e.g. the shrinker.
365 int i915_gem_evict_vm(struct i915_address_space
*vm
)
367 struct list_head
*phases
[] = {
372 struct list_head eviction_list
;
373 struct i915_vma
*vma
, *next
;
376 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
377 trace_i915_gem_evict_vm(vm
);
379 /* Switch back to the default context in order to unpin
380 * the existing context objects. However, such objects only
381 * pin themselves inside the global GTT and performing the
382 * switch otherwise is ineffective.
384 if (i915_is_ggtt(vm
)) {
385 ret
= ggtt_flush(vm
->i915
);
390 INIT_LIST_HEAD(&eviction_list
);
393 list_for_each_entry(vma
, *phase
, vm_link
) {
394 if (i915_vma_is_pinned(vma
))
398 list_add(&vma
->evict_link
, &eviction_list
);
403 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
404 __i915_vma_unpin(vma
);
406 ret
= i915_vma_unbind(vma
);
411 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
412 #include "selftests/i915_gem_evict.c"