[PATCH v7 9/9] iommu/dma: Reserve any RMR regions associated with a dev
Robin Murphy
robin.murphy at arm.com
Mon Oct 11 08:00:48 PDT 2021
On 2021-10-09 08:07, Jon Nettleton wrote:
> On Fri, Oct 8, 2021 at 3:10 PM Robin Murphy <robin.murphy at arm.com> wrote:
>>
>> On 2021-08-05 09:07, Shameer Kolothum wrote:
>>> Get ACPI IORT RMR regions associated with a dev reserved
>>> so that there is a unity mapping for them in SMMU.
>>
>> This feels like most of it belongs in the IORT code rather than
>> iommu-dma (which should save the temporary list copy as well).
>
> See previous comment. The original intent was for device-tree to also
> be able to use these mechanisms to create RMR's and support them
> in the SMMU.
Can you clarify how code behind an "if (!is_of_node(...))" check
alongside other IORT-specific code is expected to be useful for DT?
Yes, iommu_dma_get_resv_regions() itself wants to end up serving as an
abstraction layer, but that still doesn't mean it has to do much more
than dispatch into firmware-specific backends as appropriate.
Robin.
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