From: Christoph Hellwig <hch@infradead.org>
To: "NK, JESHWANTHKUMAR" <jeshwanthkumar.nk@amd.com>
Cc: Christoph Hellwig <hch@infradead.org>,
thomas.lendacky@amd.com, john.allen@amd.com,
herbert@gondor.apana.org.au, davem@davemloft.net,
jens.wiklander@linaro.org, sumit.garg@linaro.org,
jarkko.nikula@linux.intel.com, mario.limonciello@amd.com,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
op-tee@lists.trustedfirmware.org,
Mythri.Pandeshwarakrishna@amd.com, Devaraj.Rangasamy@amd.com,
Rijo-john.Thomas@amd.com, nimesh.easow@amd.com
Subject: Re: [PATCH 1/3] crypto: ccp - Add function to allocate and free memory using DMA APIs
Date: Mon, 30 Oct 2023 06:33:05 -0700 [thread overview]
Message-ID: <ZT+wkcITIz0ThWU7@infradead.org> (raw)
In-Reply-To: <94059f5c-10dd-4d75-a69c-76b21ff49546@amd.com>
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.
next prev parent reply other threads:[~2023-10-30 13:33 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-25 6:56 [PATCH 0/3] Introduce DMA APIs to allocate and free TEE shared memory jeshwank
2023-10-25 6:56 ` [PATCH 1/3] crypto: ccp - Add function to allocate and free memory using DMA APIs jeshwank
2023-10-27 5:24 ` Christoph Hellwig
2023-10-30 6:05 ` NK, JESHWANTHKUMAR
[not found] ` <94059f5c-10dd-4d75-a69c-76b21ff49546@amd.com>
2023-10-30 13:33 ` Christoph Hellwig [this message]
2023-11-01 14:12 ` NK, JESHWANTHKUMAR
2023-10-25 6:56 ` [PATCH 2/3] crypto: ccp - Use psp_tee_alloc_buffer() and psp_tee_free_buffer() jeshwank
2023-10-25 21:26 ` kernel test robot
2023-10-25 6:57 ` [PATCH 3/3] tee: amdtee: " jeshwank
2023-10-25 13:31 ` [PATCH 0/3] Introduce DMA APIs to allocate and free TEE shared memory Sumit Garg
2023-10-26 10:30 ` NK, JESHWANTHKUMAR
2023-10-26 14:53 ` Tom Lendacky
2023-10-30 6:21 ` NK, JESHWANTHKUMAR
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