openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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

To better clarify what is happening in this function.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2019-10-30 13:53:27 -04:00
parent a4840d91c9
commit 8863baefaf
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
View File

@ -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);