[RFC PATCH 4/4] ACPI: IORT: Add SMMUv3 MSI support

[Lorenzo Pieralisi]

On Tue, Sep 12, 2017 at 11:27:13AM +0800, Hanjun Guo wrote:
> Hi Lorenzo,
> 
> On 2017/8/17 21:01, Lorenzo Pieralisi wrote:
> >On Thu, Aug 17, 2017 at 03:49:37PM +0800, Hanjun Guo wrote:
> >
> >[...]
> >
> >>>  /**
> >>>   * iort_get_platform_device_domain() - Find MSI domain related to a
> >>>   * platform device
> >>>@@ -1159,6 +1207,8 @@ static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
> >>>  	/* Configure DMA for the page table walker */
> >>>  	acpi_dma_configure(&pdev->dev, attr);
> >>>+	iort_set_device_domain(&pdev->dev, node);
> >>
> >>This is fine to me, but I think we still need to retrieve
> >>the output ID as the request id for ITS, which means we
> >>need to do that in iort_pmsi_get_dev_id(), right?
> >
> >Yes, probably we can add code there like:
> >
> >ret = iort_get_id_mapping_index(&index);
> >if (!ret)
> >	iort_node_get_id(node, &id, index);
> >	...
> >
> >This requires updating iort_node_get_id() to allow single mappings
> >for SMMU/PMCG as you flagged up before.
> >
> >I will think a bit more to see if there is a cleaner way to reshuffle
> >the mapping API.
> 
> I would like to send a updated version after the merge window to gather
> more comments, and at the same time we can work on the cleaner way to
> reshuffle the mapping API, what do you thing?

I think you should send an updated patch at -rc1 with comments above, we
can rework the API later or I can do it on top of your patches for the
upcoming merge window.

Thanks !
Lorenzo