From: Christoph Hellwig <hch@lst.de>
To: "T.J. Mercier" <tjmercier@google.com>
Cc: Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>,
isaacmanjarres@google.com,
Catalin Marinas <catalin.marinas@arm.com>,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] dma-direct: Set SG_DMA_SWIOTLB flag for dma-direct
Date: Mon, 6 May 2024 18:19:06 +0200 [thread overview]
Message-ID: <20240506161906.GA17237@lst.de> (raw)
In-Reply-To: <CABdmKX1n98+bw+1kewz=wdqq2Nbpaxao_Lx-Gq8oKGNUEP4ytQ@mail.gmail.com>
On Mon, May 06, 2024 at 09:10:40AM -0700, T.J. Mercier wrote:
> I want to reject mapping a dma_buf for a device if any of the pages
> that back the buffer require SWIOTLB. AFAICT there's no way to know
> whether SWIOTLB is used until after calling dma_map_sg, so afterwards
> I'm trying to check.
You should not check, you simply must handle it by doing the proper
DMA API based ownership management.
next prev parent reply other threads:[~2024-05-06 16:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-03 18:37 [PATCH] dma-direct: Set SG_DMA_SWIOTLB flag for dma-direct T.J. Mercier
2024-05-04 8:53 ` Petr Tesařík
2024-05-09 13:28 ` Robin Murphy
2024-05-06 5:29 ` Christoph Hellwig
2024-05-06 16:00 ` T.J. Mercier
2024-05-06 16:02 ` Christoph Hellwig
2024-05-06 16:10 ` T.J. Mercier
2024-05-06 16:19 ` Christoph Hellwig [this message]
2024-05-06 16:39 ` T.J. Mercier
2024-05-07 5:43 ` Christoph Hellwig
2024-05-07 20:07 ` T.J. Mercier
2024-05-08 11:33 ` Christoph Hellwig
2024-05-09 12:54 ` Robin Murphy
2024-05-09 18:26 ` T.J. Mercier
2024-05-08 17:19 ` Catalin Marinas
2024-05-08 20:14 ` T.J. Mercier
2024-05-09 7:49 ` Catalin Marinas
2024-05-09 13:06 ` Christoph Hellwig
2024-05-09 18:32 ` T.J. Mercier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240506161906.GA17237@lst.de \
--to=hch@lst.de \
--cc=catalin.marinas@arm.com \
--cc=iommu@lists.linux.dev \
--cc=isaacmanjarres@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=robin.murphy@arm.com \
--cc=tjmercier@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox