e161d383b526757a79097eadb9e65260392befe1
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
*i915
)
38 struct intel_engine_cs
*engine
;
39 enum intel_engine_id id
;
41 if (i915
->gt
.active_requests
)
44 for_each_engine(engine
, i915
, id
) {
45 if (engine
->last_retired_context
!= i915
->kernel_context
)
52 static int ggtt_flush(struct drm_i915_private
*i915
)
56 /* Not everything in the GGTT is tracked via vma (otherwise we
57 * could evict as required with minimal stalling) so we are forced
58 * to idle the GPU and explicitly retire outstanding requests in
59 * the hopes that we can then remove contexts and the like only
60 * bound by their active reference.
62 err
= i915_gem_switch_to_kernel_context(i915
);
66 err
= i915_gem_wait_for_idle(i915
,
67 I915_WAIT_INTERRUPTIBLE
|
76 mark_free(struct drm_mm_scan
*scan
,
79 struct list_head
*unwind
)
81 if (i915_vma_is_pinned(vma
))
84 if (flags
& PIN_NONFAULT
&& !list_empty(&vma
->obj
->userfault_link
))
87 list_add(&vma
->evict_link
, unwind
);
88 return drm_mm_scan_add_block(scan
, &vma
->node
);
92 * i915_gem_evict_something - Evict vmas to make room for binding a new one
93 * @vm: address space to evict from
94 * @min_size: size of the desired free space
95 * @alignment: alignment constraint of the desired free space
96 * @cache_level: cache_level for the desired space
97 * @start: start (inclusive) of the range from which to evict objects
98 * @end: end (exclusive) of the range from which to evict objects
99 * @flags: additional flags to control the eviction algorithm
101 * This function will try to evict vmas until a free space satisfying the
102 * requirements is found. Callers must check first whether any such hole exists
103 * already before calling this function.
105 * This function is used by the object/vma binding code.
107 * Since this function is only used to free up virtual address space it only
108 * ignores pinned vmas, and not object where the backing storage itself is
109 * pinned. Hence obj->pages_pin_count does not protect against eviction.
111 * To clarify: This is for freeing up virtual address space, not for freeing
112 * memory in e.g. the shrinker.
115 i915_gem_evict_something(struct i915_address_space
*vm
,
116 u64 min_size
, u64 alignment
,
117 unsigned cache_level
,
121 struct drm_i915_private
*dev_priv
= vm
->i915
;
122 struct drm_mm_scan scan
;
123 struct list_head eviction_list
;
124 struct list_head
*phases
[] = {
129 struct i915_vma
*vma
, *next
;
130 struct drm_mm_node
*node
;
131 enum drm_mm_insert_mode mode
;
134 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
135 trace_i915_gem_evict(vm
, min_size
, alignment
, flags
);
138 * The goal is to evict objects and amalgamate space in LRU order.
139 * The oldest idle objects reside on the inactive list, which is in
140 * retirement order. The next objects to retire are those in flight,
141 * on the active list, again in retirement order.
143 * The retirement sequence is thus:
144 * 1. Inactive objects (already retired)
145 * 2. Active objects (will stall on unbinding)
147 * On each list, the oldest objects lie at the HEAD with the freshest
148 * object on the TAIL.
150 mode
= DRM_MM_INSERT_BEST
;
151 if (flags
& PIN_HIGH
)
152 mode
= DRM_MM_INSERT_HIGH
;
153 if (flags
& PIN_MAPPABLE
)
154 mode
= DRM_MM_INSERT_LOW
;
155 drm_mm_scan_init_with_range(&scan
, &vm
->mm
,
156 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
);
186 * Can we unpin some objects such as idle hw contents,
187 * or pending flips? But since only the GGTT has global entries
188 * such as scanouts, rinbuffers and contexts, we can skip the
189 * purge when inspecting per-process local address spaces.
191 if (!i915_is_ggtt(vm
) || flags
& PIN_NONBLOCK
)
195 * Not everything in the GGTT is tracked via VMA using
196 * i915_vma_move_to_active(), otherwise we could evict as required
197 * with minimal stalling. Instead we are forced to idle the GPU and
198 * explicitly retire outstanding requests which will then remove
199 * the pinning for active objects such as contexts and ring,
200 * enabling us to evict them on the next iteration.
202 * To ensure that all user contexts are evictable, we perform
203 * a switch to the perma-pinned kernel context. This all also gives
204 * us a termination condition, when the last retired context is
205 * the kernel's there is no more we can evict.
207 if (!ggtt_is_idle(dev_priv
)) {
208 ret
= ggtt_flush(dev_priv
);
216 * If we still have pending pageflip completions, drop
217 * back to userspace to give our workqueues time to
218 * acquire our locks and unpin the old scanouts.
220 return intel_has_pending_fb_unpin(dev_priv
) ? -EAGAIN
: -ENOSPC
;
223 /* drm_mm doesn't allow any other other operations while
224 * scanning, therefore store to-be-evicted objects on a
225 * temporary list and take a reference for all before
226 * calling unbind (which may remove the active reference
227 * of any of our objects, thus corrupting the list).
229 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
230 if (drm_mm_scan_remove_block(&scan
, &vma
->node
))
233 list_del(&vma
->evict_link
);
236 /* Unbinding will emit any required flushes */
238 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
239 __i915_vma_unpin(vma
);
241 ret
= i915_vma_unbind(vma
);
244 while (ret
== 0 && (node
= drm_mm_scan_color_evict(&scan
))) {
245 vma
= container_of(node
, struct i915_vma
, node
);
246 ret
= i915_vma_unbind(vma
);
253 * i915_gem_evict_for_vma - Evict vmas to make room for binding a new one
254 * @vm: address space to evict from
255 * @target: range (and color) to evict for
256 * @flags: additional flags to control the eviction algorithm
258 * This function will try to evict vmas that overlap the target node.
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_for_node(struct i915_address_space
*vm
,
264 struct drm_mm_node
*target
,
267 LIST_HEAD(eviction_list
);
268 struct drm_mm_node
*node
;
269 u64 start
= target
->start
;
270 u64 end
= start
+ target
->size
;
271 struct i915_vma
*vma
, *next
;
275 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
276 GEM_BUG_ON(!IS_ALIGNED(start
, I915_GTT_PAGE_SIZE
));
277 GEM_BUG_ON(!IS_ALIGNED(end
, I915_GTT_PAGE_SIZE
));
279 trace_i915_gem_evict_node(vm
, target
, flags
);
281 /* Retire before we search the active list. Although we have
282 * reasonable accuracy in our retirement lists, we may have
283 * a stray pin (preventing eviction) that can only be resolved by
286 if (!(flags
& PIN_NONBLOCK
))
287 i915_gem_retire_requests(vm
->i915
);
289 check_color
= vm
->mm
.color_adjust
;
291 /* Expand search to cover neighbouring guard pages (or lack!) */
293 start
-= I915_GTT_PAGE_SIZE
;
295 /* Always look at the page afterwards to avoid the end-of-GTT */
296 end
+= I915_GTT_PAGE_SIZE
;
298 GEM_BUG_ON(start
>= end
);
300 drm_mm_for_each_node_in_range(node
, &vm
->mm
, start
, end
) {
301 /* If we find any non-objects (!vma), we cannot evict them */
302 if (node
->color
== I915_COLOR_UNEVICTABLE
) {
307 GEM_BUG_ON(!node
->allocated
);
308 vma
= container_of(node
, typeof(*vma
), node
);
310 /* If we are using coloring to insert guard pages between
311 * different cache domains within the address space, we have
312 * to check whether the objects on either side of our range
313 * abutt and conflict. If they are in conflict, then we evict
314 * those as well to make room for our guard pages.
317 if (node
->start
+ node
->size
== target
->start
) {
318 if (node
->color
== target
->color
)
321 if (node
->start
== target
->start
+ target
->size
) {
322 if (node
->color
== target
->color
)
327 if (flags
& PIN_NONBLOCK
&&
328 (i915_vma_is_pinned(vma
) || i915_vma_is_active(vma
))) {
333 /* Overlap of objects in the same batch? */
334 if (i915_vma_is_pinned(vma
)) {
336 if (vma
->exec_flags
&&
337 *vma
->exec_flags
& EXEC_OBJECT_PINNED
)
342 /* Never show fear in the face of dragons!
344 * We cannot directly remove this node from within this
345 * iterator and as with i915_gem_evict_something() we employ
346 * the vma pin_count in order to prevent the action of
347 * unbinding one vma from freeing (by dropping its active
348 * reference) another in our eviction list.
351 list_add(&vma
->evict_link
, &eviction_list
);
354 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
355 __i915_vma_unpin(vma
);
357 ret
= i915_vma_unbind(vma
);
364 * i915_gem_evict_vm - Evict all idle vmas from a vm
365 * @vm: Address space to cleanse
367 * This function evicts all vmas from a vm.
369 * This is used by the execbuf code as a last-ditch effort to defragment the
372 * To clarify: This is for freeing up virtual address space, not for freeing
373 * memory in e.g. the shrinker.
375 int i915_gem_evict_vm(struct i915_address_space
*vm
)
377 struct list_head
*phases
[] = {
382 struct list_head eviction_list
;
383 struct i915_vma
*vma
, *next
;
386 lockdep_assert_held(&vm
->i915
->drm
.struct_mutex
);
387 trace_i915_gem_evict_vm(vm
);
389 /* Switch back to the default context in order to unpin
390 * the existing context objects. However, such objects only
391 * pin themselves inside the global GTT and performing the
392 * switch otherwise is ineffective.
394 if (i915_is_ggtt(vm
)) {
395 ret
= ggtt_flush(vm
->i915
);
400 INIT_LIST_HEAD(&eviction_list
);
403 list_for_each_entry(vma
, *phase
, vm_link
) {
404 if (i915_vma_is_pinned(vma
))
408 list_add(&vma
->evict_link
, &eviction_list
);
413 list_for_each_entry_safe(vma
, next
, &eviction_list
, evict_link
) {
414 __i915_vma_unpin(vma
);
416 ret
= i915_vma_unbind(vma
);
421 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
422 #include "selftests/i915_gem_evict.c"