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Date: Wed, 10 Aug 2022 15:30:23 -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 WilczyĆski <kw@...ux.com>, Bjorn Helgaas <bhelgaas@...gle.com>, kernel-team@...roid.com, Vidya Sagar <vidyas@...dia.com>, kernel test robot <lkp@...el.com>, "Isaac J . Manjarres" <isaacmanjarres@...gle.com>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 2/2] PCI: dwc: add support for 64-bit MSI target address On Wed, Aug 10, 2022 at 06:35:35PM +0000, Will McVicker wrote: > Since not all devices require a 32-bit MSI address, add support to the > PCIe host driver to allow setting the DMA mask to 64-bits. This allows > kernels to disable ZONE_DMA32 and bounce buffering (swiotlb) without > risking not being able to get a 32-bit address during DMA allocation. > Basically, in the slim chance that there are no 32-bit allocations > available, the current PCIe host driver will fail to allocate the > msi_msg page due to a DMA address overflow (seen in [1]). With this > patch, the PCIe driver can advertise 64-bit support via it's MSI > capabilities to hint to the PCIe host driver to set the DMA mask to > 64-bits. > > [1] https://lore.kernel.org/all/Yo0soniFborDl7+C@google.com/ > > Reported-by: kernel test robot <lkp@...el.com> > Signed-off-by: Will McVicker <willmcvicker@...gle.com> > --- > drivers/pci/controller/dwc/pcie-designware-host.c | 14 ++++++++++++-- > drivers/pci/controller/dwc/pcie-designware.c | 9 +++++++++ > drivers/pci/controller/dwc/pcie-designware.h | 1 + > 3 files changed, 22 insertions(+), 2 deletions(-) Reviewed-by: Rob Herring <robh@...nel.org>
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