linux-kernel - Re: [PATCH v2] PCI: rockchip: Use 64-bit mask on MSI 64-bit PCI address

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Message-ID: <20230703120825.GA2375438@rocinante>
Date:   Mon, 3 Jul 2023 21:08:25 +0900
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Rick Wertenbroek <rick.wertenbroek@...il.com>,
        alberto.dassatti@...g-vd.ch, dlemoal@...nel.org,
        Dan Carpenter <dan.carpenter@...aro.org>,
        stable@...r.kernel.org, Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Heiko Stuebner <heiko@...ech.de>, linux-pci@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] PCI: rockchip: Use 64-bit mask on MSI 64-bit PCI
 address

Hello,

> > A 32-bit mask was used on the 64-bit PCI address used for mapping MSIs.
> > This would result in the upper 32 bits being unintentionally zeroed and
> > MSIs getting mapped to incorrect PCI addresses if the address had any
> > of the upper bits set.
> > 
> > Replace 32-bit mask by appropriate 64-bit mask.

[...]
> > +#define PCIE_ADDR_MASK			GENMASK(63, MIN_AXI_ADDR_BITS_PASSED)
> 
> Nit: this probably wants to be GENMASK_ULL(), otherwise it might throw a
> warning if compile-tested for 32-bit.

I can change this to GENMASK_ULL() when I apply the patch.  Unless Rick
wants to send v3 - either way would be fine. :)

	Krzysztof