linux-kernel - [PATCH 0/3] Introduce DMA APIs to allocate and free TEE shared memory

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Date:   Wed, 25 Oct 2023 12:26:57 +0530
From:   jeshwank <JESHWANTHKUMAR.NK@....com>
To:     <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>
CC:     <Mythri.Pandeshwarakrishna@....com>, <Devaraj.Rangasamy@....com>,
        <Rijo-john.Thomas@....com>, <nimesh.easow@....com>,
        <JESHWANTHKUMAR.NK@....com>
Subject: [PATCH 0/3] Introduce DMA APIs to allocate and free TEE shared memory

From: Jeshwanth Kumar N K <JESHWANTHKUMAR.NK@....com>

At present, the shared memory for TEE ring buffer, command buffer and
data buffer is allocated using get_free_pages(). The driver shares the
physical address of these buffers with PSP so that it can be mapped by
the Trusted OS.

In this patch series we have replaced get_free_pages() with
dma_alloc_coherent() to allocate shared memory to cleanup the existing
allocation method.

Rijo Thomas (3):
  crypto: ccp - Add function to allocate and free memory using DMA APIs
  crypto: ccp - Use psp_tee_alloc_buffer() and psp_tee_free_buffer()
  tee: amdtee: Use psp_tee_alloc_buffer() and psp_tee_free_buffer()

 drivers/crypto/ccp/psp-dev.c        |   3 +
 drivers/crypto/ccp/tee-dev.c        | 119 ++++++++++++++++++----------
 drivers/crypto/ccp/tee-dev.h        |  11 +--
 drivers/tee/amdtee/amdtee_private.h |  18 ++---
 drivers/tee/amdtee/call.c           |  74 ++++++++---------
 drivers/tee/amdtee/core.c           |  72 ++++++++++-------
 drivers/tee/amdtee/shm_pool.c       |  21 ++---
 include/linux/psp-tee.h             |  47 +++++++++++
 8 files changed, 221 insertions(+), 144 deletions(-)

-- 
2.25.1