Commit 8863baef authored by Alex Deucher's avatar Alex Deucher

drm/amdgpu/gpuvm: add some additional comments in amdgpu_vm_update_ptes

To better clarify what is happening in this function.
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent a4840d91
......@@ -1418,6 +1418,9 @@ static int amdgpu_vm_update_ptes(struct amdgpu_vm_update_params *params,
uint64_t incr, entry_end, pe_start;
struct amdgpu_bo *pt;
/* make sure that the page tables covering the address range are
* actually allocated
*/
r = amdgpu_vm_alloc_pts(params->adev, params->vm, &cursor,
params->direct);
if (r)
......@@ -1491,7 +1494,12 @@ static int amdgpu_vm_update_ptes(struct amdgpu_vm_update_params *params,
} while (frag_start < entry_end);
if (amdgpu_vm_pt_descendant(adev, &cursor)) {
/* Free all child entries */
/* Free all child entries.
* Update the tables with the flags and addresses and free up subsequent
* tables in the case of huge pages or freed up areas.
* This is the maximum you can free, because all other page tables are not
* completely covered by the range and so potentially still in use.
*/
while (cursor.pfn < frag_start) {
amdgpu_vm_free_pts(adev, params->vm, &cursor);
amdgpu_vm_pt_next(adev, &cursor);
......
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