On 11/21/24 04:28, Paolo Abeni wrote:
> On 11/21/24 10:22, Dullfire wrote:
>> On 11/21/24 02:55, Paolo Abeni wrote:
>>> On 11/18/24 00:48, dullfire@xxxxxxxxx wrote:
>>>> From: Jonathan Currier <dullfire@xxxxxxxxx>
>>>>
>>>> Commit 7d5ec3d36123 ("PCI/MSI: Mask all unused MSI-X entries")
>>>> introduces a readl() from ENTRY_VECTOR_CTRL before the writel() to
>>>> ENTRY_DATA. This is correct, however some hardware, like the Sun Neptune
>>>> chips, the niu module, will cause an error and/or fatal trap if any MSIX
>>>> table entry is read before the corresponding ENTRY_DATA field is written
>>>> to. This patch adds an optional early writel() in msix_prepare_msi_desc().
>>> Why the issue can't be addressed into the relevant device driver? It
>>> looks like an H/W bug, a driver specific fix looks IMHO more fitting.
>>
>> I considered this approach, and thus asked about it in the mailing lists here:
>> https://lore.kernel.org/sparclinux/7de14cca-e2fa-49f7-b83e-5f8322cc9e56@xxxxxxxxx/T/
>
> I forgot about such thread, thank you for the reminder. Since the more
> hackish code is IRQ specific, if Thomas is fine with that, I'll not oppose.
>
>>> A cross subsystem series, like this one, gives some extra complication
>>> to maintainers.
>
> The niu driver is not exactly under very active development, I guess the
> whole series could go via the IRQ subsystem, if Thomas agrees.
>
> Cheers,
>
> Paolo
>
Thomas, does this work for you, or is there something else you would to see in this series?
Sincerely,
Jonathan Currier
