does dma_alloc_coherent setup iommu page table?

does dma_alloc_coherent setup iommu page table?

[ckim]

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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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RE: does dma_alloc_coherent setup iommu page table?

[ckim]

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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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