Debarshi Dutta ac2dfc554f gpu: nvgpu: address VPR resize for deterministic channels ...

UMD is unable to restrict railgate for deterministic channels
when NVGPU_CAN_RAILGATE is set to false. This causes issues
with VPR resize as there is no means of preventing an active
VPR resize in progress.

Add a fault handler for usermode region. The fault handler's purpose is
to intercept UMD accesses into the doorbell region when a GPU reset
is in progress. GPU reset could be triggered by VPR resize. During a
reset, the corresponding PTEs for the usermode region are zapped. The
fault handler tries to have a read access to g->deterministic_busy
and blocks till the reset is finished. A VPR resize is guaranteed
to be mutually exclusive due to use of the g->deterministic_busy
RW semaphore.

Bug 3789519

Change-Id: Ie046ee9be8d9b5d4019359c60a4578097b8d55a3
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2802185
Reviewed-by: Martin Radev <mradev@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

2023-08-18 07:45:03 -07:00

..

nvgpu

gpu: nvgpu: address VPR resize for deterministic channels

2023-08-18 07:45:03 -07:00

Makefile

nvgpu: use kernel overlay features

2017-10-29 11:00:55 -07:00