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gpu: nvgpu: add write barrier after setting notifier info32

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While checking the GPU error status, userspace polls on the error
notifier 'status' and then verifies 'status' and 'info32'. nvgpu
sets 'info32' before 'status', so put a write barrier between
those two writes for the consistency between userspace and
kernel view of the error notifier state.

JIRA NVGPU-7538
Bug 200717195
Bug 3250920

Change-Id: I92ac0589283fee823f3366ac594d03b8f27f3590
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2680320
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
This commit is contained in:
Sagar Kamble
2022-03-11 21:28:51 +05:30
committed by mobile promotions
parent 7e045bd2b4
commit 373167883e
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/nvgpu/os/linux/linux-channel.c
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@@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2017-2021, NVIDIA Corporation. All rights reserved. * Copyright (c) 2017-2022, NVIDIA Corporation. All rights reserved.
* *
* This program is free software; you can redistribute it and/or modify it * This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License, * under the terms and conditions of the GNU General Public License,
@@ -17,6 +17,7 @@
#include <nvgpu/enabled.h> #include <nvgpu/enabled.h>
#include <nvgpu/debug.h> #include <nvgpu/debug.h>
#include <nvgpu/error_notifier.h> #include <nvgpu/error_notifier.h>
#include <nvgpu/barrier.h>
#include <nvgpu/os_sched.h> #include <nvgpu/os_sched.h>
#include <nvgpu/gk20a.h> #include <nvgpu/gk20a.h>
#include <nvgpu/channel.h> #include <nvgpu/channel.h>
@@ -137,6 +138,7 @@ void nvgpu_set_err_notifier_locked(struct nvgpu_channel *ch, u32 error)
notification->time_stamp.nanoseconds[1] = notification->time_stamp.nanoseconds[1] =
(u32)(nsec >> 32); (u32)(nsec >> 32);
notification->info32 = error; notification->info32 = error;
nvgpu_wmb();
notification->status = 0xffff; notification->status = 0xffff;
if (error == NVGPU_CHANNEL_RESETCHANNEL_VERIF_ERROR) { if (error == NVGPU_CHANNEL_RESETCHANNEL_VERIF_ERROR) {