# Re: \[PATCH 03/13\] PCI: xilinx: Convert to MSI domains

- From: Michal Simek \<monstr@monstr.eu\>
- Date: 2021-03-22 12:38:43 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/03/6310170
- Thread: https://ratatoskr.run/linux-pci/2021/02/6278957/t.md

```text


On 3/22/21 1:23 PM, Lorenzo Pieralisi wrote:
> On Thu, Feb 25, 2021 at 03:10:13PM +0000, Marc Zyngier wrote:
>> 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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