linux-kernel - Re: [PATCH v4 1/2] PCI: dwc: Drop dependency on ZONE

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Date:   Fri, 12 Aug 2022 12:21:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Will McVicker <willmcvicker@...gle.com>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, kernel-team@...roid.com,
        Vidya Sagar <vidyas@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Isaac J . Manjarres" <isaacmanjarres@...gle.com>
Subject: Re: [PATCH v4 1/2] PCI: dwc: Drop dependency on ZONE_DMA32

On Thu, Aug 11, 2022 at 6:03 PM Will McVicker <willmcvicker@...gle.com> wrote:
>
> Re-work the msi_msg DMA allocation logic to use dmam_alloc_coherent() which
> uses the coherent DMA mask to try to return an allocation within the DMA
> mask limits. With that, we now can drop the msi_page parameter in struct
> dw_pcie_rp. This allows kernel configurations that disable ZONE_DMA32 to
> continue supporting a 32-bit DMA mask. Without this patch, the PCIe host
> device will fail to probe when ZONE_DMA32 is disabled.
>
> Fixes: 35797e672ff0 ("PCI: dwc: Fix MSI msi_msg DMA mapping")
> Reported-by: Isaac J. Manjarres <isaacmanjarres@...gle.com>
> Signed-off-by: Will McVicker <willmcvicker@...gle.com>
> ---
>  .../pci/controller/dwc/pcie-designware-host.c | 28 +++++--------------
>  drivers/pci/controller/dwc/pcie-designware.h  |  1 -
>  2 files changed, 7 insertions(+), 22 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>