Messages in this thread | | | Date | Mon, 30 Oct 2023 11:35:57 +0530 | Subject | Re: [PATCH 1/3] crypto: ccp - Add function to allocate and free memory using DMA APIs | From | "NK, JESHWANTHKUMAR" <> |
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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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