On Tue, Feb 26, 2019 at 12:49:15PM +0000, Jean-Philippe Brucker wrote:
> On 26/02/2019 11:17, Joerg Roedel wrote:
> > int iommu_sva_get_pasid(struct iommu_sva *handle);
> > void iommu_sva_set_exit_handler(struct iommu_sva *handle,
> > iommu_mm_exit_handler_t mm_exit);
>
> Ok sounds good. It doesn't look like this interface requires a lot of
> changes on my side (iommu_sva corresponds to the iommu_bond structure
> I've been using internally) but I might find problems while implementing it.
Great!
> Device drivers will also want to have some private data to easily
> identify the faulting or exiting context. How about:
>
> struct iommu_sva_ops {
> void (*mm_exit)(struct iommu_sva *handle, void *drvdata);
> };
> int iommu_sva_set_ops(struct iommu_sva *handle,
> const struct iommu_sva_ops *ops,
> void *drvdata);
Okay, we can also do it this way. But then please pass the drvdata via
the bind() call and not via set_ops(). Set_ops() should then really only
pass the call-backs, as the name implies.
> I now think that device driver should always call unbind() to release
> the iommu_sva handle, even if they got notified by mm_exit.
Yes, this should be required. I think it also makes driver
implementation easier because it doesn't need to care too much about
this special case.
Regards,
Joerg
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