linux-kernel - Re: [PATCH v3 3/3] PCI/MSI: Set device flag indicating only 32-bit MSI support

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Date:   Fri, 4 Dec 2020 12:07:54 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Vidya Sagar <vidyas@...dia.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Krishna Kishore <kthota@...dia.com>,
        Manikanta Maddireddy <mmaddireddy@...dia.com>,
        Vidya Sagar <sagar.tv@...il.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v3 3/3] PCI/MSI: Set device flag indicating only 32-bit
 MSI support

On Thu, Dec 03, 2020 at 12:51:10PM -0600, Bjorn Helgaas wrote:
> From: Vidya Sagar <vidyas@...dia.com>
> 
> The MSI-X Capability requires devices to support 64-bit Message Addresses,
> but the MSI Capability can support either 32- or 64-bit addresses.
> 
> Previously, we set dev->no_64bit_msi for a few broken devices that
> advertise 64-bit MSI support but don't correctly support it.
> 
> In addition, check the MSI "64-bit Address Capable" bit for all devices and
> set dev->no_64bit_msi for devices that don't advertise 64-bit support.
> This allows msi_verify_entries() to catch arch code defects that assign
> 64-bit addresses when they're not supported.
> 
> [bhelgaas: set no_64bit_msi in pci_msi_init(), commit log]
> Link: https://lore.kernel.org/r/20201124105035.24573-1-vidyas@nvidia.com
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/msi.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)

Reviewed-by: Thierry Reding <treding@...dia.com>

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