Re: [PATCH 1/3] crypto: ccp - Add function to allocate and free memory using DMA APIs

[NK, JESHWANTHKUMAR]

Hi Christoph,

On 30-Oct-23 7:03 PM, Christoph Hellwig wrote:
> On Fri, Oct 27, 2023 at 07:05:17PM +0530, NK, JESHWANTHKUMAR wrote:
> > Can you please elaborate a bit more?
> Becasue the DMA API is a blackbox.  You can pass the dma_addr_t to
> hardware, and you can use the kernel virtual address.  That it can
> sometimes be implemented using the IMMU API is an implementation
> detail.  Similarly you can only feeds iovas generated by the IOMMU
> API into the IOMMU API, not any random other scalar value, which
> is what you can get from the DMA API.

Thanks for the explanation, I will send a new version of the patch.

Regards,

Jeshwanth