From: Jason Gunthorpe <jgg@nvidia.com>
To: "Thomas Hellström (Intel)" <thomas_os@shipmail.org>
Cc: "Christian König" <christian.koenig@amd.com>,
"DRI Development" <dri-devel@lists.freedesktop.org>
Subject: Re: Fence wait in mmu_interval_notifier_ops::invalidate
Date: Wed, 9 Dec 2020 12:37:31 -0400 [thread overview]
Message-ID: <20201209163731.GU552508@nvidia.com> (raw)
In-Reply-To: <912c29f1-4e17-8b66-419b-1854d03845fd@shipmail.org>
On Wed, Dec 09, 2020 at 05:36:16PM +0100, Thomas Hellström (Intel) wrote:
> Jason, Christian
>
> In most implementations of the callback mentioned in the subject there's a
> fence wait.
> What exactly is it needed for?
Invalidate must stop DMA before returning, so presumably drivers using
a dma fence are relying on a dma fence mechanism to stop DMA.
Jason
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next prev parent reply other threads:[~2020-12-10 8:26 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 16:36 Fence wait in mmu_interval_notifier_ops::invalidate Thomas Hellström (Intel)
2020-12-09 16:37 ` Jason Gunthorpe [this message]
2020-12-09 16:46 ` Thomas Hellström (Intel)
2020-12-10 10:53 ` Christian König
2020-12-11 7:50 ` Thomas Hellström (Intel)
2020-12-11 8:57 ` Christian König
2020-12-11 9:37 ` Thomas Hellström (Intel)
2020-12-11 12:46 ` Jason Gunthorpe
2020-12-13 15:09 ` Thomas Hellström (Intel)
2020-12-14 9:52 ` Daniel Vetter
2020-12-14 10:21 ` Christian König
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