From: Christoph Hellwig <hch@lst.de>
To: Leon Romanovsky <leon@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Easwar Hariharan <eahariha@linux.microsoft.com>,
linux-kernel@vger.kernel.org, iommu@lists.linux.dev,
Jason Gunthorpe <jgg@nvidia.com>
Subject: Re: [PATCH v1 2/2] dma: Add IOMMU static calls with clear default ops
Date: Wed, 17 Jul 2024 10:56:52 +0200 [thread overview]
Message-ID: <20240717085652.GA18554@lst.de> (raw)
In-Reply-To: <20240717084713.GG5630@unreal>
On Wed, Jul 17, 2024 at 11:47:13AM +0300, Leon Romanovsky wrote:
> It will cause to the situation where "struct device" memory footprint
> will increase, while we still need to keep dma_ops for archs that don't
> want to use default IOMMU.
It won't. Even with the new bit we still have 28 more spare bits next
to it :)
> Because dma_ops pointer exists anyway and has already specific flags. I
> decided to take evolutive approach and add a new flag to it, instead of
> revolutionary approach and add a new field to struct device.
The point is that with a little more work we can actually kill that
for common configuration. For non-Xen setups that basically just means
removing the dummy ops, so it's a pretty big quick win.
next prev parent reply other threads:[~2024-07-17 8:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-15 11:44 [PATCH v1 0/2] DMA IOMMU static calls Leon Romanovsky
2024-07-15 11:44 ` [PATCH v1 1/2] dma: call unconditionally to unmap_page and unmap_sg callbacks Leon Romanovsky
2024-07-15 11:44 ` [PATCH v1 2/2] dma: Add IOMMU static calls with clear default ops Leon Romanovsky
2024-07-17 8:21 ` Christoph Hellwig
2024-07-17 8:47 ` Leon Romanovsky
2024-07-17 8:56 ` Christoph Hellwig [this message]
2024-07-17 9:53 ` Leon Romanovsky
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