linux-kernel - Re: [PATCH 2/2] PCI: iproc: Support multi-MSI only on uniprocessor kernel

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Date:   Sun, 06 Jun 2021 14:28:12 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Sandor Bodo-Merle <sbodomerle@...il.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] PCI: iproc: Support multi-MSI only on uniprocessor
 kernel

On 2021-06-06 13:30, Sandor Bodo-Merle wrote:
> The interrupt affinity scheme used by this driver is incompatible with
> multi-MSI as it implies moving the doorbell address to that of another 
> MSI
> group.  This isn't possible for multi-MSI, as all the MSIs must have 
> the
> same doorbell address. As such it is restricted to systems with a 
> single
> CPU.
> 
> Fixes: fc54bae28818 ("PCI: iproc: Allow allocation of multiple MSIs")
> Reported-by: Marc Zyngier <maz@...nel.org>
> Signed-off-by: Sandor Bodo-Merle <sbodomerle@...il.com>

Acked-by: Marc Zyngier <maz@...nel.org>

         M.
-- 
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