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

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Date:   Thu, 26 Oct 2023 22:24:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     jeshwank <JESHWANTHKUMAR.NK@....com>
Cc:     thomas.lendacky@....com, john.allen@....com,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        jens.wiklander@...aro.org, sumit.garg@...aro.org,
        jarkko.nikula@...ux.intel.com, mario.limonciello@....com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        op-tee@...ts.trustedfirmware.org,
        Mythri.Pandeshwarakrishna@....com, Devaraj.Rangasamy@....com,
        Rijo-john.Thomas@....com, nimesh.easow@....com
Subject: Re: [PATCH 1/3] crypto: ccp - Add function to allocate and free
 memory using DMA APIs

On Wed, Oct 25, 2023 at 12:26:58PM +0530, jeshwank wrote:
> +	tee_buf->vaddr = dma_alloc_coherent(psp->dev, size, &tee_buf->dma, gfp);
> +	if (!tee_buf->vaddr || !tee_buf->dma) {
> +		kfree(tee_buf);
> +		return NULL;
> +	}
> +
> +	tee_buf->size = size;
> +
> +	/* Check whether IOMMU is present. If present, translate IOVA
> +	 * to physical address, else the dma handle is the physical
> +	 * address.
> +	 */
> +	dom = iommu_get_domain_for_dev(psp->dev);
> +	if (dom)
> +		tee_buf->paddr = iommu_iova_to_phys(dom, tee_buf->dma);
> +	else

No, you can't mix the DMA API and iommu API.  You need to stick to one
or the other.