From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Alistair Popple <alistair@popple.id.au>, linuxppc-dev@ozlabs.org
Cc: Alistair Popple <alistair@popple.id.au>, mhairgrove@nvidia.com
Subject: Re: powernv/npu-dma.c: Add explicit flush when sending an ATSD
Date: Tue, 27 Jun 2017 22:28:08 +1000 (AEST) [thread overview]
Message-ID: <3wxlZJ2vYCz9s74@ozlabs.org> (raw)
In-Reply-To: <1497947848-4625-1-git-send-email-alistair@popple.id.au>
On Tue, 2017-06-20 at 08:37:28 UTC, Alistair Popple wrote:
> NPU2 requires an extra explicit flush to an active GPU PID when sending
> address translation shoot downs (ATSDs) to reliably flush the GPU TLB. This
> patch adds just such a flush at the end of each sequence of ATSDs.
>
> We can safely use PID 0 which is always reserved and active on the GPU. PID
> 0 is only used for init_mm which will never be a user mm on the GPU. To
> enforce this we add a check in pnv_npu2_init_context() just in case someone
> tries to use PID 0 on the GPU.
>
> Signed-off-by: Alistair Popple <alistair@popple.id.au>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/bbd5ff50afffcf4a01d05367524736
cheers
prev parent reply other threads:[~2017-06-27 12:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-20 8:37 [PATCH] powernv/npu-dma.c: Add explicit flush when sending an ATSD Alistair Popple
2017-06-27 12:28 ` Michael Ellerman [this message]
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