On 12/9/20 5:37 PM, Jason Gunthorpe wrote:
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.
Yes, so far I follow, but what's the reason drivers need to stop DMA?
Is it for invlidation before breaking COW after fork or something related?
Thanks,
Thomas
Jason
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