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

On 27-Oct-23 10:54 AM, Christoph Hellwig wrote:
> 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.
Can you please elaborate?

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