[PATCH 2/6] dma-buf: add reservation object shared fence accessor
Christian König
ckoenig.leichtzumerken at gmail.com
Thu Aug 9 11:37:09 UTC 2018
Add a helper to access the shared fences in an reservation object.
Signed-off-by: Christian König <christian.koenig at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 7 ++-----
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 3 +--
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++--
drivers/gpu/drm/msm/msm_gem.c | 4 ++--
drivers/gpu/drm/nouveau/nouveau_fence.c | 3 +--
drivers/gpu/drm/radeon/radeon_sync.c | 3 +--
drivers/gpu/drm/ttm/ttm_bo.c | 4 +---
include/linux/reservation.h | 19 +++++++++++++++++++
8 files changed, 29 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index fa38a960ce00..989932234160 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -238,9 +238,7 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
for (i = 0; i < shared_count; ++i) {
struct dma_fence *f;
- f = rcu_dereference_protected(fobj->shared[i],
- reservation_object_held(resv));
-
+ f = reservation_object_get_shared_fence(resv, fobj, i);
if (ef) {
if (f->context == ef->base.context) {
dma_fence_put(f);
@@ -273,8 +271,7 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
struct dma_fence *f;
struct amdgpu_amdkfd_fence *efence;
- f = rcu_dereference_protected(fobj->shared[i],
- reservation_object_held(resv));
+ f = reservation_object_get_shared_fence(resv, fobj, i);
efence = to_amdgpu_amdkfd_fence(f);
if (efence) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index 2d6f5ec77a68..dbfd62ab67e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -212,8 +212,7 @@ int amdgpu_sync_resv(struct amdgpu_device *adev,
return r;
for (i = 0; i < flist->shared_count; ++i) {
- f = rcu_dereference_protected(flist->shared[i],
- reservation_object_held(resv));
+ f = reservation_object_get_shared_fence(resv, flist, i);
/* We only want to trigger KFD eviction fences on
* evict or move jobs. Skip KFD fences otherwise.
*/
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index c6611cff64c8..22896a398eab 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1482,8 +1482,8 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
flist = reservation_object_get_list(bo->resv);
if (flist) {
for (i = 0; i < flist->shared_count; ++i) {
- f = rcu_dereference_protected(flist->shared[i],
- reservation_object_held(bo->resv));
+ f = reservation_object_get_shared_fence(bo->resv,
+ flist, i);
if (amdkfd_fence_check_mm(f, current->mm))
return false;
}
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index f583bb4222f9..95d25dbfde2b 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -651,8 +651,8 @@ int msm_gem_sync_object(struct drm_gem_object *obj,
return 0;
for (i = 0; i < fobj->shared_count; i++) {
- fence = rcu_dereference_protected(fobj->shared[i],
- reservation_object_held(msm_obj->resv));
+ fence = reservation_object_get_shared_fence(msm_obj->resv,
+ fobj, i);
if (fence->context != fctx->context) {
ret = dma_fence_wait(fence, true);
if (ret)
diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 412d49bc6e56..3ce921c276c1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -376,8 +376,7 @@ nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan, bool e
struct nouveau_channel *prev = NULL;
bool must_wait = true;
- fence = rcu_dereference_protected(fobj->shared[i],
- reservation_object_held(resv));
+ fence = reservation_object_get_shared_fence(resv, fobj, i);
f = nouveau_local_fence(fence, chan->drm);
if (f) {
diff --git a/drivers/gpu/drm/radeon/radeon_sync.c b/drivers/gpu/drm/radeon/radeon_sync.c
index be5d7a38d3aa..bf7f9a648838 100644
--- a/drivers/gpu/drm/radeon/radeon_sync.c
+++ b/drivers/gpu/drm/radeon/radeon_sync.c
@@ -110,8 +110,7 @@ int radeon_sync_resv(struct radeon_device *rdev,
return r;
for (i = 0; i < flist->shared_count; ++i) {
- f = rcu_dereference_protected(flist->shared[i],
- reservation_object_held(resv));
+ f = reservation_object_get_shared_fence(resv, flist, i);
fence = to_radeon_fence(f);
if (fence && fence->rdev == rdev)
radeon_sync_fence(sync, fence);
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 7c484729f9b2..820d97d3e8b9 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -370,9 +370,7 @@ static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
dma_fence_enable_sw_signaling(fence);
for (i = 0; fobj && i < fobj->shared_count; ++i) {
- fence = rcu_dereference_protected(fobj->shared[i],
- reservation_object_held(bo->resv));
-
+ fence = reservation_object_get_shared_fence(bo->resv, fobj, i);
if (!fence->ops->signaled)
dma_fence_enable_sw_signaling(fence);
}
diff --git a/include/linux/reservation.h b/include/linux/reservation.h
index 54cf6773a14c..8a3298574bf5 100644
--- a/include/linux/reservation.h
+++ b/include/linux/reservation.h
@@ -140,6 +140,25 @@ reservation_object_get_list(struct reservation_object *obj)
reservation_object_held(obj));
}
+/**
+ * reservation_object_get_shared_fence - get a fence from a reservation object's
+ * shared fence list.
+ * @obj: the reservation object
+ * @list: the list to get the fence from
+ * @idx: the index in the list to get
+ *
+ * Returns the fence from the shared fence list. Does NOT take references to
+ * the fence. Needs to be in RCU context or the obj->lock must be held.
+ */
+static inline struct dma_fence *
+reservation_object_get_shared_fence(struct reservation_object *obj,
+ struct reservation_object_list *list,
+ unsigned int idx)
+{
+ return rcu_dereference_protected(list->shared[idx],
+ reservation_object_held(obj));
+}
+
/**
* reservation_object_lock - lock the reservation object
* @obj: the reservation object
--
2.14.1
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