6.6-stable review patch. If anyone has any objections, please let me know.
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From: Philip Yang Philip.Yang@amd.com
[ Upstream commit ebab8c3eb6a6515dc14cd93fc29dd287709da6d3 ]
On gfx943 APU there is no VRAM and page migration, queue CWSR area, svm range with always mapped flag, is not mapped to GPU correctly. This works fine if retry fault on CWSR area can be recovered, but could cause deadlock if there is another retry fault recover waiting for CWSR to finish.
Fix this by mapping svm range with always mapped flag to GPU with ACCESS attribute if XNACK ON.
There is side effect, because all GPUs have ACCESS attribute by default on new svm range with XNACK on, the CWSR area will be mapped to all GPUs after this change. This side effect will be fixed with Thunk change to set CWSR svm range with ACCESS_IN_PLACE attribute on the GPU that user queue is created.
Signed-off-by: Philip Yang Philip.Yang@amd.com Reviewed-by: Felix Kuehling felix.kuehling@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index 63ce30ea6891..8e368e4659fd 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -1632,18 +1632,24 @@ static int svm_range_validate_and_map(struct mm_struct *mm, if (test_bit(gpuidx, prange->bitmap_access)) bitmap_set(ctx->bitmap, gpuidx, 1); } + + /* + * If prange is already mapped or with always mapped flag, + * update mapping on GPUs with ACCESS attribute + */ + if (bitmap_empty(ctx->bitmap, MAX_GPU_INSTANCE)) { + if (prange->mapped_to_gpu || + prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED) + bitmap_copy(ctx->bitmap, prange->bitmap_access, MAX_GPU_INSTANCE); + } } else { bitmap_or(ctx->bitmap, prange->bitmap_access, prange->bitmap_aip, MAX_GPU_INSTANCE); }
if (bitmap_empty(ctx->bitmap, MAX_GPU_INSTANCE)) { - bitmap_copy(ctx->bitmap, prange->bitmap_access, MAX_GPU_INSTANCE); - if (!prange->mapped_to_gpu || - bitmap_empty(ctx->bitmap, MAX_GPU_INSTANCE)) { - r = 0; - goto free_ctx; - } + r = 0; + goto free_ctx; }
if (prange->actual_loc && !prange->ttm_res) {