From e6f8d26ebbcf45ff964abf7d9d2430401638067c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Christian=20K=C3=B6nig?= Date: Tue, 14 Aug 2018 09:37:06 +0200 Subject: [PATCH] drm/amdgpu: fix amdgpu_amdkfd_remove_eviction_fence v3 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Fix quite a number of bugs here. Unfortunately only compile tested. v2: fix copy&paste error v3: fix 80 chars issue in comment Signed-off-by: Christian König Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 103 ++++++++---------- 1 file changed, 46 insertions(+), 57 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c index 8a707d8bbb1c..f92597c292fe 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c @@ -206,11 +206,9 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo, struct amdgpu_amdkfd_fence ***ef_list, unsigned int *ef_count) { - struct reservation_object_list *fobj; - struct reservation_object *resv; - unsigned int i = 0, j = 0, k = 0, shared_count; - unsigned int count = 0; - struct amdgpu_amdkfd_fence **fence_list; + struct reservation_object *resv = bo->tbo.resv; + struct reservation_object_list *old, *new; + unsigned int i, j, k; if (!ef && !ef_list) return -EINVAL; @@ -220,76 +218,67 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo, *ef_count = 0; } - resv = bo->tbo.resv; - fobj = reservation_object_get_list(resv); - - if (!fobj) + old = reservation_object_get_list(resv); + if (!old) return 0; - preempt_disable(); - write_seqcount_begin(&resv->seq); + new = kmalloc(offsetof(typeof(*new), shared[old->shared_max]), + GFP_KERNEL); + if (!new) + return -ENOMEM; - /* Go through all the shared fences in the resevation object. If - * ef is specified and it exists in the list, remove it and reduce the - * count. If ef is not specified, then get the count of eviction fences - * present. + /* Go through all the shared fences in the resevation object and sort + * the interesting ones to the end of the list. */ - shared_count = fobj->shared_count; - for (i = 0; i < shared_count; ++i) { + for (i = 0, j = old->shared_count, k = 0; i < old->shared_count; ++i) { struct dma_fence *f; - f = rcu_dereference_protected(fobj->shared[i], + f = rcu_dereference_protected(old->shared[i], reservation_object_held(resv)); - if (ef) { - if (f->context == ef->base.context) { - dma_fence_put(f); - fobj->shared_count--; - } else { - RCU_INIT_POINTER(fobj->shared[j++], f); - } - } else if (to_amdgpu_amdkfd_fence(f)) - count++; + if ((ef && f->context == ef->base.context) || + (!ef && to_amdgpu_amdkfd_fence(f))) + RCU_INIT_POINTER(new->shared[--j], f); + else + RCU_INIT_POINTER(new->shared[k++], f); } - write_seqcount_end(&resv->seq); - preempt_enable(); - - if (ef || !count) - return 0; - - /* Alloc memory for count number of eviction fence pointers. Fill the - * ef_list array and ef_count - */ - fence_list = kcalloc(count, sizeof(struct amdgpu_amdkfd_fence *), - GFP_KERNEL); - if (!fence_list) - return -ENOMEM; + new->shared_max = old->shared_max; + new->shared_count = k; - preempt_disable(); - write_seqcount_begin(&resv->seq); + if (!ef) { + unsigned int count = old->shared_count - j; - j = 0; - for (i = 0; i < shared_count; ++i) { - struct dma_fence *f; - struct amdgpu_amdkfd_fence *efence; - - f = rcu_dereference_protected(fobj->shared[i], - reservation_object_held(resv)); + /* Alloc memory for count number of eviction fence pointers. + * Fill the ef_list array and ef_count + */ + *ef_list = kcalloc(count, sizeof(**ef_list), GFP_KERNEL); + *ef_count = count; - efence = to_amdgpu_amdkfd_fence(f); - if (efence) { - fence_list[k++] = efence; - fobj->shared_count--; - } else { - RCU_INIT_POINTER(fobj->shared[j++], f); + if (!*ef_list) { + kfree(new); + return -ENOMEM; } } + /* Install the new fence list, seqcount provides the barriers */ + preempt_disable(); + write_seqcount_begin(&resv->seq); + RCU_INIT_POINTER(resv->fence, new); write_seqcount_end(&resv->seq); preempt_enable(); - *ef_list = fence_list; - *ef_count = k; + /* Drop the references to the removed fences or move them to ef_list */ + for (i = j, k = 0; i < old->shared_count; ++i) { + struct dma_fence *f; + + f = rcu_dereference_protected(new->shared[i], + reservation_object_held(resv)); + if (!ef) + (*ef_list)[k++] = to_amdgpu_amdkfd_fence(f); + else + dma_fence_put(f); + } + kfree_rcu(old, rcu); return 0; } -- 2.45.2