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