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1/*
2 * Copyright 2014 Advanced Micro Devices, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
16 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
17 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
18 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
19 * USE OR OTHER DEALINGS IN THE SOFTWARE.
20 *
21 * The above copyright notice and this permission notice (including the
22 * next paragraph) shall be included in all copies or substantial portions
23 * of the Software.
24 *
25 */
26/*
27 * Authors:
28 * Christian König <christian.koenig@amd.com>
29 */
30
31#include <drm/drmP.h>
32#include "amdgpu.h"
33#include "amdgpu_trace.h"
34
35struct amdgpu_sync_entry {
36 struct hlist_node node;
37 struct fence *fence;
38};
39
40static struct kmem_cache *amdgpu_sync_slab;
41
42/**
43 * amdgpu_sync_create - zero init sync object
44 *
45 * @sync: sync object to initialize
46 *
47 * Just clear the sync object for now.
48 */
49void amdgpu_sync_create(struct amdgpu_sync *sync)
50{
51 hash_init(sync->fences);
52 sync->last_vm_update = NULL;
53}
54
55/**
56 * amdgpu_sync_same_dev - test if fence belong to us
57 *
58 * @adev: amdgpu device to use for the test
59 * @f: fence to test
60 *
61 * Test if the fence was issued by us.
62 */
63static bool amdgpu_sync_same_dev(struct amdgpu_device *adev, struct fence *f)
64{
65 struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
66
67 if (s_fence) {
68 struct amdgpu_ring *ring;
69
70 ring = container_of(s_fence->sched, struct amdgpu_ring, sched);
71 return ring->adev == adev;
72 }
73
74 return false;
75}
76
77/**
78 * amdgpu_sync_get_owner - extract the owner of a fence
79 *
80 * @fence: fence get the owner from
81 *
82 * Extract who originally created the fence.
83 */
84static void *amdgpu_sync_get_owner(struct fence *f)
85{
86 struct amd_sched_fence *s_fence = to_amd_sched_fence(f);
87
88 if (s_fence)
89 return s_fence->owner;
90
91 return AMDGPU_FENCE_OWNER_UNDEFINED;
92}
93
94/**
95 * amdgpu_sync_keep_later - Keep the later fence
96 *
97 * @keep: existing fence to test
98 * @fence: new fence
99 *
100 * Either keep the existing fence or the new one, depending which one is later.
101 */
102static void amdgpu_sync_keep_later(struct fence **keep, struct fence *fence)
103{
104 if (*keep && fence_is_later(*keep, fence))
105 return;
106
107 fence_put(*keep);
108 *keep = fence_get(fence);
109}
110
111/**
112 * amdgpu_sync_fence - remember to sync to this fence
113 *
114 * @sync: sync object to add fence to
115 * @fence: fence to sync to
116 *
117 */
118int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
119 struct fence *f)
120{
121 struct amdgpu_sync_entry *e;
122
123 if (!f)
124 return 0;
125
126 if (amdgpu_sync_same_dev(adev, f) &&
127 amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
128 amdgpu_sync_keep_later(&sync->last_vm_update, f);
129
130 hash_for_each_possible(sync->fences, e, node, f->context) {
131 if (unlikely(e->fence->context != f->context))
132 continue;
133
134 amdgpu_sync_keep_later(&e->fence, f);
135 return 0;
136 }
137
138 e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
139 if (!e)
140 return -ENOMEM;
141
142 hash_add(sync->fences, &e->node, f->context);
143 e->fence = fence_get(f);
144 return 0;
145}
146
147/**
148 * amdgpu_sync_resv - sync to a reservation object
149 *
150 * @sync: sync object to add fences from reservation object to
151 * @resv: reservation object with embedded fence
152 * @shared: true if we should only sync to the exclusive fence
153 *
154 * Sync to the fence
155 */
156int amdgpu_sync_resv(struct amdgpu_device *adev,
157 struct amdgpu_sync *sync,
158 struct reservation_object *resv,
159 void *owner)
160{
161 struct reservation_object_list *flist;
162 struct fence *f;
163 void *fence_owner;
164 unsigned i;
165 int r = 0;
166
167 if (resv == NULL)
168 return -EINVAL;
169
170 /* always sync to the exclusive fence */
171 f = reservation_object_get_excl(resv);
172 r = amdgpu_sync_fence(adev, sync, f);
173
174 flist = reservation_object_get_list(resv);
175 if (!flist || r)
176 return r;
177
178 for (i = 0; i < flist->shared_count; ++i) {
179 f = rcu_dereference_protected(flist->shared[i],
180 reservation_object_held(resv));
181 if (amdgpu_sync_same_dev(adev, f)) {
182 /* VM updates are only interesting
183 * for other VM updates and moves.
184 */
185 fence_owner = amdgpu_sync_get_owner(f);
186 if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
187 (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
188 ((owner == AMDGPU_FENCE_OWNER_VM) !=
189 (fence_owner == AMDGPU_FENCE_OWNER_VM)))
190 continue;
191
192 /* Ignore fence from the same owner as
193 * long as it isn't undefined.
194 */
195 if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
196 fence_owner == owner)
197 continue;
198 }
199
200 r = amdgpu_sync_fence(adev, sync, f);
201 if (r)
202 break;
203 }
204 return r;
205}
206
207struct fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync)
208{
209 struct amdgpu_sync_entry *e;
210 struct hlist_node *tmp;
211 struct fence *f;
212 int i;
213
214 hash_for_each_safe(sync->fences, i, tmp, e, node) {
215
216 f = e->fence;
217
218 hash_del(&e->node);
219 kmem_cache_free(amdgpu_sync_slab, e);
220
221 if (!fence_is_signaled(f))
222 return f;
223
224 fence_put(f);
225 }
226 return NULL;
227}
228
229int amdgpu_sync_wait(struct amdgpu_sync *sync)
230{
231 struct amdgpu_sync_entry *e;
232 struct hlist_node *tmp;
233 int i, r;
234
235 hash_for_each_safe(sync->fences, i, tmp, e, node) {
236 r = fence_wait(e->fence, false);
237 if (r)
238 return r;
239
240 hash_del(&e->node);
241 fence_put(e->fence);
242 kmem_cache_free(amdgpu_sync_slab, e);
243 }
244
245 return 0;
246}
247
248/**
249 * amdgpu_sync_free - free the sync object
250 *
251 * @sync: sync object to use
252 *
253 * Free the sync object.
254 */
255void amdgpu_sync_free(struct amdgpu_sync *sync)
256{
257 struct amdgpu_sync_entry *e;
258 struct hlist_node *tmp;
259 unsigned i;
260
261 hash_for_each_safe(sync->fences, i, tmp, e, node) {
262 hash_del(&e->node);
263 fence_put(e->fence);
264 kmem_cache_free(amdgpu_sync_slab, e);
265 }
266
267 fence_put(sync->last_vm_update);
268}
269
270/**
271 * amdgpu_sync_init - init sync object subsystem
272 *
273 * Allocate the slab allocator.
274 */
275int amdgpu_sync_init(void)
276{
277 amdgpu_sync_slab = kmem_cache_create(
278 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
279 SLAB_HWCACHE_ALIGN, NULL);
280 if (!amdgpu_sync_slab)
281 return -ENOMEM;
282
283 return 0;
284}
285
286/**
287 * amdgpu_sync_fini - fini sync object subsystem
288 *
289 * Free the slab allocator.
290 */
291void amdgpu_sync_fini(void)
292{
293 kmem_cache_destroy(amdgpu_sync_slab);
294}
1/*
2 * Copyright 2014 Advanced Micro Devices, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
16 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
17 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
18 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
19 * USE OR OTHER DEALINGS IN THE SOFTWARE.
20 *
21 * The above copyright notice and this permission notice (including the
22 * next paragraph) shall be included in all copies or substantial portions
23 * of the Software.
24 *
25 */
26/*
27 * Authors:
28 * Christian König <christian.koenig@amd.com>
29 */
30
31#include "amdgpu.h"
32#include "amdgpu_trace.h"
33#include "amdgpu_amdkfd.h"
34
35struct amdgpu_sync_entry {
36 struct hlist_node node;
37 struct dma_fence *fence;
38 bool explicit;
39};
40
41static struct kmem_cache *amdgpu_sync_slab;
42
43/**
44 * amdgpu_sync_create - zero init sync object
45 *
46 * @sync: sync object to initialize
47 *
48 * Just clear the sync object for now.
49 */
50void amdgpu_sync_create(struct amdgpu_sync *sync)
51{
52 hash_init(sync->fences);
53 sync->last_vm_update = NULL;
54}
55
56/**
57 * amdgpu_sync_same_dev - test if fence belong to us
58 *
59 * @adev: amdgpu device to use for the test
60 * @f: fence to test
61 *
62 * Test if the fence was issued by us.
63 */
64static bool amdgpu_sync_same_dev(struct amdgpu_device *adev,
65 struct dma_fence *f)
66{
67 struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
68
69 if (s_fence) {
70 struct amdgpu_ring *ring;
71
72 ring = container_of(s_fence->sched, struct amdgpu_ring, sched);
73 return ring->adev == adev;
74 }
75
76 return false;
77}
78
79/**
80 * amdgpu_sync_get_owner - extract the owner of a fence
81 *
82 * @fence: fence get the owner from
83 *
84 * Extract who originally created the fence.
85 */
86static void *amdgpu_sync_get_owner(struct dma_fence *f)
87{
88 struct drm_sched_fence *s_fence;
89 struct amdgpu_amdkfd_fence *kfd_fence;
90
91 if (!f)
92 return AMDGPU_FENCE_OWNER_UNDEFINED;
93
94 s_fence = to_drm_sched_fence(f);
95 if (s_fence)
96 return s_fence->owner;
97
98 kfd_fence = to_amdgpu_amdkfd_fence(f);
99 if (kfd_fence)
100 return AMDGPU_FENCE_OWNER_KFD;
101
102 return AMDGPU_FENCE_OWNER_UNDEFINED;
103}
104
105/**
106 * amdgpu_sync_keep_later - Keep the later fence
107 *
108 * @keep: existing fence to test
109 * @fence: new fence
110 *
111 * Either keep the existing fence or the new one, depending which one is later.
112 */
113static void amdgpu_sync_keep_later(struct dma_fence **keep,
114 struct dma_fence *fence)
115{
116 if (*keep && dma_fence_is_later(*keep, fence))
117 return;
118
119 dma_fence_put(*keep);
120 *keep = dma_fence_get(fence);
121}
122
123/**
124 * amdgpu_sync_add_later - add the fence to the hash
125 *
126 * @sync: sync object to add the fence to
127 * @f: fence to add
128 *
129 * Tries to add the fence to an existing hash entry. Returns true when an entry
130 * was found, false otherwise.
131 */
132static bool amdgpu_sync_add_later(struct amdgpu_sync *sync, struct dma_fence *f, bool explicit)
133{
134 struct amdgpu_sync_entry *e;
135
136 hash_for_each_possible(sync->fences, e, node, f->context) {
137 if (unlikely(e->fence->context != f->context))
138 continue;
139
140 amdgpu_sync_keep_later(&e->fence, f);
141
142 /* Preserve eplicit flag to not loose pipe line sync */
143 e->explicit |= explicit;
144
145 return true;
146 }
147 return false;
148}
149
150/**
151 * amdgpu_sync_fence - remember to sync to this fence
152 *
153 * @sync: sync object to add fence to
154 * @fence: fence to sync to
155 *
156 */
157int amdgpu_sync_fence(struct amdgpu_device *adev, struct amdgpu_sync *sync,
158 struct dma_fence *f, bool explicit)
159{
160 struct amdgpu_sync_entry *e;
161
162 if (!f)
163 return 0;
164 if (amdgpu_sync_same_dev(adev, f) &&
165 amdgpu_sync_get_owner(f) == AMDGPU_FENCE_OWNER_VM)
166 amdgpu_sync_keep_later(&sync->last_vm_update, f);
167
168 if (amdgpu_sync_add_later(sync, f, explicit))
169 return 0;
170
171 e = kmem_cache_alloc(amdgpu_sync_slab, GFP_KERNEL);
172 if (!e)
173 return -ENOMEM;
174
175 e->explicit = explicit;
176
177 hash_add(sync->fences, &e->node, f->context);
178 e->fence = dma_fence_get(f);
179 return 0;
180}
181
182/**
183 * amdgpu_sync_resv - sync to a reservation object
184 *
185 * @sync: sync object to add fences from reservation object to
186 * @resv: reservation object with embedded fence
187 * @explicit_sync: true if we should only sync to the exclusive fence
188 *
189 * Sync to the fence
190 */
191int amdgpu_sync_resv(struct amdgpu_device *adev,
192 struct amdgpu_sync *sync,
193 struct dma_resv *resv,
194 void *owner, bool explicit_sync)
195{
196 struct dma_resv_list *flist;
197 struct dma_fence *f;
198 void *fence_owner;
199 unsigned i;
200 int r = 0;
201
202 if (resv == NULL)
203 return -EINVAL;
204
205 /* always sync to the exclusive fence */
206 f = dma_resv_get_excl(resv);
207 r = amdgpu_sync_fence(adev, sync, f, false);
208
209 flist = dma_resv_get_list(resv);
210 if (!flist || r)
211 return r;
212
213 for (i = 0; i < flist->shared_count; ++i) {
214 f = rcu_dereference_protected(flist->shared[i],
215 dma_resv_held(resv));
216 /* We only want to trigger KFD eviction fences on
217 * evict or move jobs. Skip KFD fences otherwise.
218 */
219 fence_owner = amdgpu_sync_get_owner(f);
220 if (fence_owner == AMDGPU_FENCE_OWNER_KFD &&
221 owner != AMDGPU_FENCE_OWNER_UNDEFINED)
222 continue;
223
224 if (amdgpu_sync_same_dev(adev, f)) {
225 /* VM updates are only interesting
226 * for other VM updates and moves.
227 */
228 if ((owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
229 (fence_owner != AMDGPU_FENCE_OWNER_UNDEFINED) &&
230 ((owner == AMDGPU_FENCE_OWNER_VM) !=
231 (fence_owner == AMDGPU_FENCE_OWNER_VM)))
232 continue;
233
234 /* Ignore fence from the same owner and explicit one as
235 * long as it isn't undefined.
236 */
237 if (owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
238 (fence_owner == owner || explicit_sync))
239 continue;
240 }
241
242 r = amdgpu_sync_fence(adev, sync, f, false);
243 if (r)
244 break;
245 }
246 return r;
247}
248
249/**
250 * amdgpu_sync_peek_fence - get the next fence not signaled yet
251 *
252 * @sync: the sync object
253 * @ring: optional ring to use for test
254 *
255 * Returns the next fence not signaled yet without removing it from the sync
256 * object.
257 */
258struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
259 struct amdgpu_ring *ring)
260{
261 struct amdgpu_sync_entry *e;
262 struct hlist_node *tmp;
263 int i;
264
265 hash_for_each_safe(sync->fences, i, tmp, e, node) {
266 struct dma_fence *f = e->fence;
267 struct drm_sched_fence *s_fence = to_drm_sched_fence(f);
268
269 if (dma_fence_is_signaled(f)) {
270 hash_del(&e->node);
271 dma_fence_put(f);
272 kmem_cache_free(amdgpu_sync_slab, e);
273 continue;
274 }
275 if (ring && s_fence) {
276 /* For fences from the same ring it is sufficient
277 * when they are scheduled.
278 */
279 if (s_fence->sched == &ring->sched) {
280 if (dma_fence_is_signaled(&s_fence->scheduled))
281 continue;
282
283 return &s_fence->scheduled;
284 }
285 }
286
287 return f;
288 }
289
290 return NULL;
291}
292
293/**
294 * amdgpu_sync_get_fence - get the next fence from the sync object
295 *
296 * @sync: sync object to use
297 * @explicit: true if the next fence is explicit
298 *
299 * Get and removes the next fence from the sync object not signaled yet.
300 */
301struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync, bool *explicit)
302{
303 struct amdgpu_sync_entry *e;
304 struct hlist_node *tmp;
305 struct dma_fence *f;
306 int i;
307 hash_for_each_safe(sync->fences, i, tmp, e, node) {
308
309 f = e->fence;
310 if (explicit)
311 *explicit = e->explicit;
312
313 hash_del(&e->node);
314 kmem_cache_free(amdgpu_sync_slab, e);
315
316 if (!dma_fence_is_signaled(f))
317 return f;
318
319 dma_fence_put(f);
320 }
321 return NULL;
322}
323
324/**
325 * amdgpu_sync_clone - clone a sync object
326 *
327 * @source: sync object to clone
328 * @clone: pointer to destination sync object
329 *
330 * Adds references to all unsignaled fences in @source to @clone. Also
331 * removes signaled fences from @source while at it.
332 */
333int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone)
334{
335 struct amdgpu_sync_entry *e;
336 struct hlist_node *tmp;
337 struct dma_fence *f;
338 int i, r;
339
340 hash_for_each_safe(source->fences, i, tmp, e, node) {
341 f = e->fence;
342 if (!dma_fence_is_signaled(f)) {
343 r = amdgpu_sync_fence(NULL, clone, f, e->explicit);
344 if (r)
345 return r;
346 } else {
347 hash_del(&e->node);
348 dma_fence_put(f);
349 kmem_cache_free(amdgpu_sync_slab, e);
350 }
351 }
352
353 dma_fence_put(clone->last_vm_update);
354 clone->last_vm_update = dma_fence_get(source->last_vm_update);
355
356 return 0;
357}
358
359int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr)
360{
361 struct amdgpu_sync_entry *e;
362 struct hlist_node *tmp;
363 int i, r;
364
365 hash_for_each_safe(sync->fences, i, tmp, e, node) {
366 r = dma_fence_wait(e->fence, intr);
367 if (r)
368 return r;
369
370 hash_del(&e->node);
371 dma_fence_put(e->fence);
372 kmem_cache_free(amdgpu_sync_slab, e);
373 }
374
375 return 0;
376}
377
378/**
379 * amdgpu_sync_free - free the sync object
380 *
381 * @sync: sync object to use
382 *
383 * Free the sync object.
384 */
385void amdgpu_sync_free(struct amdgpu_sync *sync)
386{
387 struct amdgpu_sync_entry *e;
388 struct hlist_node *tmp;
389 unsigned i;
390
391 hash_for_each_safe(sync->fences, i, tmp, e, node) {
392 hash_del(&e->node);
393 dma_fence_put(e->fence);
394 kmem_cache_free(amdgpu_sync_slab, e);
395 }
396
397 dma_fence_put(sync->last_vm_update);
398}
399
400/**
401 * amdgpu_sync_init - init sync object subsystem
402 *
403 * Allocate the slab allocator.
404 */
405int amdgpu_sync_init(void)
406{
407 amdgpu_sync_slab = kmem_cache_create(
408 "amdgpu_sync", sizeof(struct amdgpu_sync_entry), 0,
409 SLAB_HWCACHE_ALIGN, NULL);
410 if (!amdgpu_sync_slab)
411 return -ENOMEM;
412
413 return 0;
414}
415
416/**
417 * amdgpu_sync_fini - fini sync object subsystem
418 *
419 * Free the slab allocator.
420 */
421void amdgpu_sync_fini(void)
422{
423 kmem_cache_destroy(amdgpu_sync_slab);
424}