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genirq/msi: Provide msi_domain_ops:: Prepare_desc()
The existing MSI domain ops msi_prepare() and set_desc() turned out to be unsuitable for implementing IMS support. msi_prepare() does not operate on the MSI descriptors. set_desc() lacks an irq_domain pointer and has a completely different purpose. Introduce a prepare_desc() op which allows IMS implementations to amend an MSI descriptor which was allocated by the core code, e.g. by adjusting the iomem base or adding some data based on the allocated index. This is way better than requiring that all IMS domain implementations preallocate the MSI descriptor and then allocate the interrupt. Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Kevin Tian <[email protected]> Acked-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected]
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