[PATCH v2 0/2] iommu: Remove iommu_sva_ops::mm_exit()
joro at 8bytes.org
Fri May 29 12:53:11 UTC 2020
On Thu, Apr 23, 2020 at 02:53:27PM +0200, Jean-Philippe Brucker wrote:
> The IOMMU SVA API currently requires device drivers to implement an
> mm_exit() callback, which stops device jobs that do DMA. This function
> is called in the release() MMU notifier, when an address space that is
> shared with a device exits.
> It has been noted several time during discussions about SVA that
> cancelling DMA jobs can be slow and complex, and doing it in the
> release() notifier might cause synchronization issues. Device drivers
> must in any case call unbind() to remove their bond, after stopping DMA
> from a more favorable context (release of a file descriptor).
> Patch 1 removes the mm_exit() callback from the uacce module, and patch
> 2 removes it from the IOMMU API. Since v1  I fixed the uacce unbind
> reported by Zhangfei and added details in the commit message of patch 2.
> Jean-Philippe Brucker (2):
> uacce: Remove mm_exit() op
> iommu: Remove iommu_sva_ops::mm_exit()
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