drm/amdkfd: use hmm range fault to get both domain pfns

Now that prange could have mixed domains (VRAM or SYSRAM),
actual_loc nor svm_bo can not be used to check its current
domain and eventually get its pfns to map them in GPU.
Instead, pfns from both domains, are now obtained from
hmm_range_fault through amdgpu_hmm_range_get_pages
call. This is done everytime a GPU map occur.
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

@@ -1426,7 +1426,6 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
 
 	svm_range_reserve_bos(&ctx);
 
-	if (!prange->actual_loc) {
 	p = container_of(prange->svms, struct kfd_process, svms);
 	owner = kfd_svm_page_owner(p, find_first_bit(ctx.bitmap,
 						MAX_GPU_INSTANCE));
@@ -1453,16 +1452,13 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
 	}
 
 	prange->validated_once = true;
-	}
 
 	svm_range_lock(prange);
-	if (!prange->actual_loc) {
 	if (amdgpu_hmm_range_get_pages_done(hmm_range)) {
 		pr_debug("hmm update the range, need validate again\n");
 		r = -EAGAIN;
 		goto unlock_out;
 	}
-	}
 	if (!list_empty(&prange->child_list)) {
 		pr_debug("range split by unmap in parallel, validate again\n");
 		r = -EAGAIN;
@@ -2797,16 +2793,6 @@ svm_range_trigger_migration(struct mm_struct *mm, struct svm_range *prange,
 	    best_loc == prange->actual_loc)
 		return 0;
 
-	/*
-	 * Prefetch to GPU without host access flag, set actual_loc to gpu, then
-	 * validate on gpu and map to gpus will be handled afterwards.
-	 */
-	if (best_loc && !prange->actual_loc &&
-	    !(prange->flags & KFD_IOCTL_SVM_FLAG_HOST_ACCESS)) {
-		prange->actual_loc = best_loc;
-		return 0;
-	}
-
 	if (!best_loc) {
 		r = svm_migrate_vram_to_ram(prange, mm);
 		*migrated = !r;