From: Christoph Hellwig <hch@infradead.org>
To: "Isaac J. Manjarres" <isaacm@codeaurora.org>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Liam Mark <lmark@codeaurora.org>,
joro@8bytes.org, pratikp@codeaurora.org, kernel-team@android.com
Subject: Re: [RFC PATCH] iommu/dma: Allow drivers to reserve an iova range
Date: Mon, 17 Feb 2020 00:01:38 -0800 [thread overview]
Message-ID: <20200217080138.GB10342@infradead.org> (raw)
In-Reply-To: <1581721096-16235-1-git-send-email-isaacm@codeaurora.org>
On Fri, Feb 14, 2020 at 02:58:16PM -0800, Isaac J. Manjarres wrote:
> From: Liam Mark <lmark@codeaurora.org>
>
> Some devices have a memory map which contains gaps or holes.
> In order for the device to have as much IOVA space as possible,
> allow its driver to inform the DMA-IOMMU layer that it should
> not allocate addresses from these holes.
Layering violation. dma-iommu is the translation layer between the
DMA API and the IOMMU API. And calls into it from drivers performing
DMA mappings need to go through the DMA API (and be documented there).
next prev parent reply other threads:[~2020-02-17 8:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 22:58 [RFC PATCH] iommu/dma: Allow drivers to reserve an iova range Isaac J. Manjarres
2020-02-17 8:01 ` Christoph Hellwig [this message]
2020-02-17 15:50 ` Robin Murphy
2020-02-19 1:57 ` isaacm
2020-02-19 11:15 ` Will Deacon
2020-02-19 20:06 ` isaacm
2020-02-20 8:45 ` Will Deacon
2020-02-20 18:57 ` Pratik Patel
2020-02-19 9:46 ` Joerg Roedel
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