Re: [PATCH v6.1] iommu/dma: Add support for mapping MSIs

Hi Robin,

On 07/09/16 10:55, Robin Murphy wrote:

When an MSI doorbell is located downstream of an IOMMU, attaching
devices to a DMA ops domain and switching on translation leads to a rude
shock when their attempt to write to the physical address returned by
the irqchip driver faults (or worse, writes into some already-mapped
buffer) and no interrupt is forthcoming.

Address this by adding a hook for relevant irqchip drivers to call from
their compose_msi_msg() callback, to swizzle the physical address with
an appropriatly-mapped IOVA for any device attached to one of our DMA
ops domains.

CC: Thomas Gleixner <redacted>
CC: Jason Cooper <redacted>
CC: Marc Zyngier <redacted>
CC: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Robin Murphy <redacted>

Thanks for the quick respin.

Acked-by: Marc Zyngier <redacted>

	M.
-- 
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