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From: <ckim@etri.re.kr>
To: <kernelnewbies@kernelnewbies.org>
Subject: RE: does dma_alloc_coherent setup iommu page table?
Date: Wed, 29 Sep 2021 17:18:25 +0900	[thread overview]
Message-ID: <008801d7b50a$939cb4a0$bad61de0$@etri.re.kr> (raw)
In-Reply-To: <007201d7b501$bf0a5880$3d1f0980$@etri.re.kr>


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I realized the IOMMU mapping is done with dma_alloc_  or dma_map_..

It's so basic (I have read
https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt ) but I forgot.

Thanks!

Chan Kim

 

From: ckim@etri.re.kr <ckim@etri.re.kr> 
Sent: Wednesday, September 29, 2021 4:15 PM
To: kernelnewbies@kernelnewbies.org
Subject: does dma_alloc_coherent setup iommu page table?

 

Hello all,

When the driver calls dma_alloc_coherent for a device, and if the device
uses iommu, is the table entry for the iommu setup for the dma_handle?

Seeing the struct device has something related to iommu, I guess so..

Any help appreciated.

Thanks!

Chan Kim


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      reply	other threads:[~2021-09-29  8:18 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29  7:15 does dma_alloc_coherent setup iommu page table? ckim
2021-09-29  8:18 ` ckim [this message]

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