Hi Oleksandr, On 8/20/19 7:09 PM, Oleksandr Tyshchenko wrote:
From: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>We need to have some abstract way to add new device to the IOMMU based on the generic IOMMU DT bindings [1] which can be used for both DT (right now) and ACPI (in future). For that reason we can borrow the idea used in Linux these days called "iommu_fwspec". Having this in, it will be possible to configure IOMMU master interfaces of the device (device IDs) from a single common place and avoid keeping almost identical look-up implementations in each IOMMU driver. There is no need to port the whole implementation of "iommu_fwspec" to Xen, we could, probably, end up with a much simpler solution, some "stripped down" version which fits our requirements. So, this patch adds the following: 1. A common structure "iommu_fwspec" to hold the the per-device firmware data 2. New member "iommu_fwspec" of struct device 3. Functions/helpers to deal with "dev->iommu_fwspec" It should be noted that in comparing with original "iommu_fwspec"
s/comparing with/comparison of/ s/original/the Linux/ or "the original".
Xen's variant doesn't contain some fields, which are not really needed at the moment (ops, flag) and "iommu_fwnode" field was replaced by "iommu_dev" to avoid porting a lot of code (to support "fwnode_handle") with little benefit.
It would be good to mention which version of Linux this is based on. So if there is a critical bug in Linux we can port it.
The rest of the patch looks good to me. Cheers, -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
