From: Philip Yang Philip.Yang@amd.com

commit 8c45b31909b730f9c7b146588e038f9c6553394d upstream.

If the SVM range has no GPU access nor access-in-place attribute, validate and map to GPU should skip the range.

Add NULL pointer check if find_first_bit(ctx->bitmap, MAX_GPU_INSTANCE) returns MAX_GPU_INSTANCE as gpuidx if ctx->bitmap is empty.

Signed-off-by: Philip Yang Philip.Yang@amd.com Reviewed-by: Alex Sierra alex.sierra@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com [m.masimov@maxima.ru: In order to adapt this patch to branch 6.1 ctx was treated as a variable and not as a pointer.] Signed-off-by: Murad Masimov m.masimov@maxima.ru --- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index 7fa5e70f1aac..a44781b66af9 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -1491,6 +1491,8 @@ static void *kfd_svm_page_owner(struct kfd_process *p, int32_t gpuidx) struct kfd_process_device *pdd;

pdd = kfd_process_device_from_gpuidx(p, gpuidx); + if (!pdd) + return NULL;

return SVM_ADEV_PGMAP_OWNER(pdd->dev->adev); } @@ -1561,10 +1563,10 @@ static int svm_range_validate_and_map(struct mm_struct *mm, }

if (bitmap_empty(ctx.bitmap, MAX_GPU_INSTANCE)) { - if (!prange->mapped_to_gpu) - return 0; - bitmap_copy(ctx.bitmap, prange->bitmap_access, MAX_GPU_INSTANCE); + if (!prange->mapped_to_gpu || + bitmap_empty(ctx.bitmap, MAX_GPU_INSTANCE)) + return 0; }

if (prange->actual_loc && !prange->ttm_res) {