git/linux-net
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/ synced 2026-04-18 06:33:43 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/ttm: add multihop infrastrucutre (v3)

Browse Source 
Currently drivers get called to move a buffer, but if they have to
move it temporarily through another space (SYSTEM->VRAM via TT)
then they can end up with a lot of ttm->driver->ttm call stacks,
if the temprorary space moves requires eviction.

Instead of letting the driver do all the placement/space for the
temporary, allow it to report back (-EMULTIHOP) and a placement (hop)
to the move code, which will then do the temporary move, and the
correct placement move afterwards.

This removes a lot of code from drivers, at the expense of
adding some midlayering. I've some further ideas on how to turn
it inside out, but I think this is a good solution to the call
stack problems.

v2: separate out the driver patches, add WARN for getting
MULTHOP in paths we shouldn't (Daniel)
v3: use memset (Christian)

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: hristian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201109005432.861936-2-airlied@gmail.com
This commit is contained in:
Dave Airlie
2020-10-29 13:58:52 +10:00
parent 2dcab875e7
commit ebdf565169
8 changed files with 83 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
View File

@@ -695,7 +695,8 @@ static void vmw_swap_notify(struct ttm_buffer_object *bo)
static int vmw_move(struct ttm_buffer_object *bo,
bool evict,
struct ttm_operation_ctx *ctx,
struct ttm_resource *new_mem)
struct ttm_resource *new_mem,
struct ttm_place *hop)
{
struct ttm_resource_manager *old_man = ttm_manager_type(bo->bdev, bo->mem.mem_type);
struct ttm_resource_manager *new_man = ttm_manager_type(bo->bdev, new_mem->mem_type);