![Jammy Zhou](/assets/img/avatar_default.png)
Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com>
235 lines
6 KiB
C
235 lines
6 KiB
C
/*
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* Copyright 2014 Advanced Micro Devices, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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*/
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/*
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* Authors:
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* Christian König <christian.koenig@amd.com>
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*/
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#include <drm/drmP.h>
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#include "amdgpu.h"
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#include "amdgpu_trace.h"
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/**
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* amdgpu_sync_create - zero init sync object
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*
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* @sync: sync object to initialize
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*
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* Just clear the sync object for now.
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*/
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void amdgpu_sync_create(struct amdgpu_sync *sync)
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{
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unsigned i;
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for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
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sync->semaphores[i] = NULL;
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for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
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sync->sync_to[i] = NULL;
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sync->last_vm_update = NULL;
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}
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/**
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* amdgpu_sync_fence - use the semaphore to sync to a fence
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*
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* @sync: sync object to add fence to
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* @fence: fence to sync to
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*
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* Sync to the fence using the semaphore objects
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*/
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void amdgpu_sync_fence(struct amdgpu_sync *sync,
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struct amdgpu_fence *fence)
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{
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struct amdgpu_fence *other;
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if (!fence)
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return;
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other = sync->sync_to[fence->ring->idx];
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sync->sync_to[fence->ring->idx] = amdgpu_fence_ref(
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amdgpu_fence_later(fence, other));
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amdgpu_fence_unref(&other);
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if (fence->owner == AMDGPU_FENCE_OWNER_VM) {
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other = sync->last_vm_update;
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sync->last_vm_update = amdgpu_fence_ref(
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amdgpu_fence_later(fence, other));
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amdgpu_fence_unref(&other);
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}
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}
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/**
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* amdgpu_sync_resv - use the semaphores to sync to a reservation object
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*
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* @sync: sync object to add fences from reservation object to
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* @resv: reservation object with embedded fence
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* @shared: true if we should only sync to the exclusive fence
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*
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* Sync to the fence using the semaphore objects
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*/
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int amdgpu_sync_resv(struct amdgpu_device *adev,
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struct amdgpu_sync *sync,
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struct reservation_object *resv,
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void *owner)
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{
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struct reservation_object_list *flist;
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struct fence *f;
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struct amdgpu_fence *fence;
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unsigned i;
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int r = 0;
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if (resv == NULL)
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return -EINVAL;
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/* always sync to the exclusive fence */
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f = reservation_object_get_excl(resv);
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fence = f ? to_amdgpu_fence(f) : NULL;
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if (fence && fence->ring->adev == adev)
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amdgpu_sync_fence(sync, fence);
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else if (f)
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r = fence_wait(f, true);
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flist = reservation_object_get_list(resv);
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if (!flist || r)
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return r;
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for (i = 0; i < flist->shared_count; ++i) {
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f = rcu_dereference_protected(flist->shared[i],
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reservation_object_held(resv));
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fence = f ? to_amdgpu_fence(f) : NULL;
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if (fence && fence->ring->adev == adev) {
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if (fence->owner != owner ||
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fence->owner == AMDGPU_FENCE_OWNER_UNDEFINED)
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amdgpu_sync_fence(sync, fence);
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} else if (f) {
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r = fence_wait(f, true);
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if (r)
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break;
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}
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}
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return r;
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}
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/**
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* amdgpu_sync_rings - sync ring to all registered fences
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*
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* @sync: sync object to use
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* @ring: ring that needs sync
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*
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* Ensure that all registered fences are signaled before letting
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* the ring continue. The caller must hold the ring lock.
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*/
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int amdgpu_sync_rings(struct amdgpu_sync *sync,
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struct amdgpu_ring *ring)
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{
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struct amdgpu_device *adev = ring->adev;
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unsigned count = 0;
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int i, r;
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for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
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struct amdgpu_fence *fence = sync->sync_to[i];
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struct amdgpu_semaphore *semaphore;
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struct amdgpu_ring *other = adev->rings[i];
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/* check if we really need to sync */
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if (!amdgpu_fence_need_sync(fence, ring))
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continue;
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/* prevent GPU deadlocks */
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if (!other->ready) {
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dev_err(adev->dev, "Syncing to a disabled ring!");
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return -EINVAL;
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}
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if (count >= AMDGPU_NUM_SYNCS) {
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/* not enough room, wait manually */
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r = amdgpu_fence_wait(fence, false);
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if (r)
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return r;
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continue;
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}
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r = amdgpu_semaphore_create(adev, &semaphore);
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if (r)
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return r;
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sync->semaphores[count++] = semaphore;
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/* allocate enough space for sync command */
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r = amdgpu_ring_alloc(other, 16);
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if (r)
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return r;
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/* emit the signal semaphore */
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if (!amdgpu_semaphore_emit_signal(other, semaphore)) {
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/* signaling wasn't successful wait manually */
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amdgpu_ring_undo(other);
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r = amdgpu_fence_wait(fence, false);
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if (r)
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return r;
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continue;
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}
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/* we assume caller has already allocated space on waiters ring */
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if (!amdgpu_semaphore_emit_wait(ring, semaphore)) {
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/* waiting wasn't successful wait manually */
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amdgpu_ring_undo(other);
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r = amdgpu_fence_wait(fence, false);
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if (r)
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return r;
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continue;
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}
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amdgpu_ring_commit(other);
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amdgpu_fence_note_sync(fence, ring);
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}
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return 0;
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}
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/**
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* amdgpu_sync_free - free the sync object
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*
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* @adev: amdgpu_device pointer
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* @sync: sync object to use
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* @fence: fence to use for the free
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*
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* Free the sync object by freeing all semaphores in it.
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*/
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void amdgpu_sync_free(struct amdgpu_device *adev,
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struct amdgpu_sync *sync,
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struct amdgpu_fence *fence)
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{
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unsigned i;
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for (i = 0; i < AMDGPU_NUM_SYNCS; ++i)
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amdgpu_semaphore_free(adev, &sync->semaphores[i], fence);
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for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
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amdgpu_fence_unref(&sync->sync_to[i]);
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amdgpu_fence_unref(&sync->last_vm_update);
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}
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