On 3/22/21 1:23 PM, Lorenzo Pieralisi wrote:

On Thu, Feb 25, 2021 at 03:10:13PM +0000, Marc Zyngier wrote:

quoted

In anticipation of the removal of the msi_controller structure, convert
the ancient xilinx host controller driver to MSI domains.

We end-up with the usual two domain structure, the top one being a
generic PCI/MSI domain, the bottom one being xilinx-specific and handling
the actual HW interrupt allocation.

This allows us to fix some of the most appaling MSI programming, where
the message programmed in the device is the virtual IRQ number instead
of the allocated vector number. The allocator is also made safe with
a mutex. This should allow support for MultiMSI, but I decided not to
even try, since I cannot test it.

Also take the opportunity to get rid of the cargo-culted memory allocation
for the MSI capture address. *ANY* sufficiently aligned address should
be good enough, so use the physical address of the xilinx_pcie_host
structure instead.

I'd agree with Bjorn that the MSI doorbell change is better split into
a separate patch, I can do it myself at merge if you agree.

Thank you for doing it.

Thanks,
Michal

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