On 8/21/19 4:10 PM, Daniel Vetter wrote:
On Wed, Aug 21, 2019 at 3:16 PM Thomas Hellström (VMware)
<thomas_os@xxxxxxxxxxxx> wrote:
On 8/20/19 4:53 PM, Daniel Vetter wrote:
With nouveau fixed all ttm-using drives have the correct nesting of
mmap_sem vs dma_resv, and we can just lock the buffer.
Assuming I didn't screw up anything with my audit of course.
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Christian Koenig <christian.koenig@xxxxxxx>
Cc: Huang Rui <ray.huang@xxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: "VMware Graphics" <linux-graphics-maintainer@xxxxxxxxxx>
Cc: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 34 ---------------------------------
drivers/gpu/drm/ttm/ttm_bo_vm.c | 26 +------------------------
include/drm/ttm/ttm_bo_api.h | 1 -
3 files changed, 1 insertion(+), 60 deletions(-)
+ dma_resv_lock(bo->base.resv, NULL);
interruptible, or at least killable. (IIRC think killable is the right
choice in fault code, even if TTM initially implemented interruptible to
get reasonable Xorg "silken mouse" latency).
I think interruptible is fine. I chickend out of that for v1 because I
always mix up the return code for _lock_interruptibl() :-)
:). IIRC I think the in-kernel users of fault() were unhappy with
interruptible. (GUP?), but I guess it's better to use a bulk change at
some point if necessary.
/Thomas
I'll add that for the next version too.
-Daniel
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