From: Han Jingoo <jingoohan1@gmail.com>
To: Will McVicker <willmcvicker@google.com>
Cc: "Gustavo Pimentel" <gustavo.pimentel@synopsys.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
kernel-team@android.com, "Vidya Sagar" <vidyas@nvidia.com>,
"Christoph Hellwig" <hch@infradead.org>,
"<linux-pci@vger.kernel.org>" <linux-pci@vger.kernel.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"kernel test robot" <lkp@intel.com>
Subject: Re: [PATCH v4 2/2] PCI: dwc: Add support for 64-bit MSI target address
Date: Thu, 11 Aug 2022 19:46:27 -0700 [thread overview]
Message-ID: <CAPOBaE5_teX6-39ofwC=YG3scc4dT+S47sQNUZYeu7WMzpe1mQ@mail.gmail.com> (raw)
In-Reply-To: <20220812000327.3154251-3-willmcvicker@google.com>
On 08/11/2022, 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 device can advertise 64-bit support via its 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@intel.com>
> Signed-off-by: Will McVicker <willmcvicker@google.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 14 ++++++++++++--
> drivers/pci/controller/dwc/pcie-designware.c | 8 ++++++++
> drivers/pci/controller/dwc/pcie-designware.h | 1 +
> 3 files changed, 21 insertions(+), 2 deletions(-)
…..
next prev parent reply other threads:[~2022-08-12 2:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-12 0:03 [PATCH v4 0/2] PCI: dwc: Add support for 64-bit MSI target addresses Will McVicker
2022-08-12 0:03 ` [PATCH v4 1/2] PCI: dwc: Drop dependency on ZONE_DMA32 Will McVicker
2022-08-12 2:47 ` Han Jingoo
2022-08-12 18:21 ` Rob Herring
2022-08-12 0:03 ` [PATCH v4 2/2] PCI: dwc: Add support for 64-bit MSI target address Will McVicker
2022-08-12 2:46 ` Han Jingoo [this message]
2022-08-23 11:27 ` Robin Murphy
2022-08-25 18:39 ` William McVicker
2022-08-23 10:01 ` [PATCH v4 0/2] PCI: dwc: Add support for 64-bit MSI target addresses Lorenzo Pieralisi
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