From: Robin Murphy <robin.murphy@arm.com>
To: Christoph Hellwig <hch@infradead.org>,
Will McVicker <willmcvicker@google.com>
Cc: "Jingoo Han" <jingoohan1@gmail.com>,
"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>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
"kernel test robot" <lkp@intel.com>
Subject: Re: [PATCH v5 2/2] PCI: dwc: Add support for 64-bit MSI target address
Date: Fri, 9 Sep 2022 14:47:19 +0100 [thread overview]
Message-ID: <5bfd7d4d-d431-6321-89bc-663dcd36e930@arm.com> (raw)
In-Reply-To: <Yxs/zguOb52tY2C0@infradead.org>
On 2022-09-09 14:29, Christoph Hellwig wrote:
> On Thu, Aug 25, 2022 at 06:50:25PM +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 if the 32-bit
>> allocation fails. 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.
>
> Umm. You can't just disable ZONE_DMA32. Linux absolutely requires a
> 32-bit dma mask to work, it is in fact the implicit default.
Eh, it's behind CONFIG_EXPERT, which makes it enough of a "I think I
know what I'm doing and accept responsibility for picking up the pieces
if it breaks" thing.
Robin.
next prev parent reply other threads:[~2022-09-09 13:48 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-25 18:50 [PATCH v5 0/2] PCI: dwc: Add support for 64-bit MSI target addresses Will McVicker
2022-08-25 18:50 ` [PATCH v5 1/2] PCI: dwc: Drop dependency on ZONE_DMA32 Will McVicker
2022-09-28 11:41 ` Serge Semin
2022-09-29 18:25 ` Robin Murphy
2022-09-29 19:32 ` Serge Semin
2022-09-30 11:01 ` Robin Murphy
2022-09-30 12:57 ` Serge Semin
2022-09-30 15:39 ` Robin Murphy
2022-09-30 17:02 ` William McVicker
2022-10-03 8:04 ` Lorenzo Pieralisi
2022-10-03 16:40 ` William McVicker
2022-10-07 22:45 ` Serge Semin
2022-08-25 18:50 ` [PATCH v5 2/2] PCI: dwc: Add support for 64-bit MSI target address Will McVicker
2022-08-25 20:59 ` Robin Murphy
2022-08-25 21:22 ` William McVicker
2022-09-09 13:29 ` Christoph Hellwig
2022-09-09 13:47 ` Robin Murphy [this message]
2022-09-09 14:47 ` Christoph Hellwig
2022-09-09 15:00 ` Robin Murphy
2022-09-28 12:05 ` Serge Semin
2022-09-28 17:52 ` William McVicker
2022-09-29 8:13 ` Lorenzo Pieralisi
2022-09-29 18:50 ` William McVicker
2022-09-29 19:00 ` Serge Semin
2022-09-30 13:46 ` Lorenzo Pieralisi
2022-09-30 14:14 ` Serge Semin
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