From b20af5c8d7e607de781ed22694e67e514a133294 Mon Sep 17 00:00:00 2001 From: Bas Nieuwenhuizen Date: Sat, 4 Feb 2017 23:26:50 +0100 Subject: [PATCH] radv/amdgpu: Use reference counting for bos. Per the Vulkan spec, memory objects may be deleted before the buffers and images using them are deleted, although those resources then cannot be used except for deletion themselves. For the virtual buffers, we need to access them on resource destruction to unmap the regions, so this results in a use-after-free. Implement reference counting to avoid this. Signed-off-by: Bas Nieuwenhuizen Reviewed-by: Dave Airlie --- src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.c | 10 ++++++++++ src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.h | 1 + 2 files changed, 11 insertions(+) diff --git a/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.c b/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.c index 8e78ef7..7b67945 100644 --- a/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.c +++ b/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.c @@ -34,6 +34,11 @@ #include #include +#include "util/u_atomic.h" + + +static void radv_amdgpu_winsys_bo_destroy(struct radeon_winsys_bo *_bo); + static void radv_amdgpu_winsys_virtual_map(struct radv_amdgpu_winsys_bo *bo, const struct radv_amdgpu_map_range *range) @@ -43,6 +48,7 @@ radv_amdgpu_winsys_virtual_map(struct radv_amdgpu_winsys_bo *bo, if (!range->bo) return; /* TODO: PRT mapping */ + p_atomic_inc(&range->bo->ref_count); int r = amdgpu_bo_va_op(range->bo->bo, range->bo_offset, range->size, range->offset + bo->va, 0, AMDGPU_VA_OP_MAP); if (r) @@ -62,6 +68,7 @@ radv_amdgpu_winsys_virtual_unmap(struct radv_amdgpu_winsys_bo *bo, range->offset + bo->va, 0, AMDGPU_VA_OP_UNMAP); if (r) abort(); + radv_amdgpu_winsys_bo_destroy((struct radeon_winsys_bo *)range->bo); } static void @@ -212,6 +219,8 @@ static void radv_amdgpu_winsys_bo_destroy(struct radeon_winsys_bo *_bo) { struct radv_amdgpu_winsys_bo *bo = radv_amdgpu_winsys_bo(_bo); + if (p_atomic_dec_return(&bo->ref_count)) + return; if (bo->is_virtual) { for (uint32_t i = 0; i < bo->range_count; ++i) { radv_amdgpu_winsys_virtual_unmap(bo, bo->ranges + i); @@ -273,6 +282,7 @@ radv_amdgpu_winsys_bo_create(struct radeon_winsys *_ws, bo->size = size; bo->ws = ws; bo->is_virtual = !!(flags & RADEON_FLAG_VIRTUAL); + bo->ref_count = 1; if (flags & RADEON_FLAG_VIRTUAL) { bo->ranges = realloc(NULL, sizeof(struct radv_amdgpu_map_range)); diff --git a/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.h b/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.h index c7d484b..4512e76 100644 --- a/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.h +++ b/src/amd/vulkan/winsys/amdgpu/radv_amdgpu_bo.h @@ -45,6 +45,7 @@ struct radv_amdgpu_winsys_bo { uint64_t size; struct radv_amdgpu_winsys *ws; bool is_virtual; + int ref_count; union { /* physical bo */ -- 2.7.4