On 6/29/2023 5:29 PM, Philip Yang wrote:
If the SVM range has no GPU access or access-in-place attribute,
Just a nit-pick. Shouldn't be no GPU access nor access-in-place?
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@xxxxxxx>
Reviewed-by: Alex Sierra <alex.sierra@xxxxxxx>
---
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 5ff1a5a89d96..479c4f66afa7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1522,6 +1522,8 @@ 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);
}
@@ -1596,12 +1598,12 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
}
if (bitmap_empty(ctx->bitmap, MAX_GPU_INSTANCE)) {
- if (!prange->mapped_to_gpu) {
+ 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;
}
-
- bitmap_copy(ctx->bitmap, prange->bitmap_access, MAX_GPU_INSTANCE);
}
if (prange->actual_loc && !prange->ttm_res) {
