From: Jason Gunthorpe <jgg@nvidia.com>
To: Pranjal Shrivastava <praan@google.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Albert Ou <aou@eecs.berkeley.edu>,
asahi@lists.linux.dev,
Baolin Wang <baolin.wang@linux.alibaba.com>,
iommu@lists.linux.dev, Janne Grunau <j@jannau.net>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Joerg Roedel <joro@8bytes.org>,
Jean-Philippe Brucker <jpb@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev,
Matthias Brugger <matthias.bgg@gmail.com>,
Neal Gompa <neal@gompa.dev>, Orson Zhai <orsonzhai@gmail.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <pjw@kernel.org>,
Samuel Holland <samuel@sholland.org>,
Sven Peter <sven@kernel.org>,
virtualization@lists.linux.dev, Chen-Yu Tsai <wens@kernel.org>,
Will Deacon <will@kernel.org>, Yong Wu <yong.wu@mediatek.com>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Lu Baolu <baolu.lu@linux.intel.com>,
Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>,
Joerg Roedel <joerg.roedel@amd.com>,
Jon Hunter <jonathanh@nvidia.com>,
patches@lists.linux.dev, Robin Murphy <robin.murphy@arm.com>,
Samiullah Khawaja <skhawaja@google.com>,
stable@vger.kernel.org, Vasant Hegde <vasant.hegde@amd.com>
Subject: Re: [PATCH] iommu: Always fill in gather when unmapping
Date: Wed, 1 Apr 2026 09:58:50 -0300 [thread overview]
Message-ID: <20260401125850.GZ310919@nvidia.com> (raw)
In-Reply-To: <ac0AKyvHMYHlqL5i@google.com>
On Wed, Apr 01, 2026 at 11:23:23AM +0000, Pranjal Shrivastava wrote:
> I was wondering if, as a longer-term direction, having an explicit flag
> for these drivers to indicate they always require a sync would be a
> cleaner way to handle this than the trivial population?
My first thought was to just set the gather to start=0,end=ULONG_MAX
but it turned out to be trivial to just set the right gather parameters
and it looks like it is basically the same cost..
Adding a flag would mean we have to test the flag on the other case
where we don't use this flow, which doesn't seem good either.
Jason
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next prev parent reply other threads:[~2026-04-01 13:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-31 19:56 [PATCH] iommu: Always fill in gather when unmapping Jason Gunthorpe
2026-04-01 10:40 ` Jon Hunter
2026-04-01 11:23 ` Pranjal Shrivastava
2026-04-01 12:58 ` Jason Gunthorpe [this message]
2026-04-01 16:33 ` Robin Murphy
2026-04-01 17:36 ` Jason Gunthorpe
2026-04-02 18:11 ` Robin Murphy
2026-04-02 22:51 ` Jason Gunthorpe
2026-04-08 8:42 ` Jon Hunter
2026-04-08 13:34 ` Jon Hunter
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