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[86.30.250.44]) by smtp.gmail.com with ESMTPSA id 18sm6964211wmm.32.2018.11.30.02.47.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 30 Nov 2018 02:47:57 -0800 (PST) From: Srinivas Kandagatla To: robh+dt@kernel.org, gregkh@linuxfoundation.org, arnd@arndb.de Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, bkumar@qti.qualcomm.com, thierry.escande@linaro.org, Srinivas Kandagatla Subject: [RFC PATCH 0/6] char: Add support to Qualcomm FastRPC driver Date: Fri, 30 Nov 2018 10:46:51 +0000 Message-Id: <20181130104657.14875-1-srinivas.kandagatla@linaro.org> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset adds support to Qualcomm FastRPC driver which implements an IPC (Inter-Processor Communication) mechanism that allows for clients to transparently make remote method invocations across processor boundaries. The below diagram depicts invocation of a single method where the client and objects reside on different processors. An object could expose multiple methods which can be grouped together and referred to as an interface. : ,--------, ,------, ,-----------, ,------, ,--------, : | | method | | | | | | method | | : | Client |------->| Stub |->| Transport |->| Skel |------->| Object | : | | | | | | | | | | : `--------` `------` `-----------` `------` `--------` Client: Linux user mode process that initiates the remote invocation Stub: Auto generated code linked in with the user mode process that takes care of marshaling parameters Transport: Involved in carrying an invocation from a client to an object. This involves two portions: 1) FastRPC Linux kernel driver that receives the remote invocation, queues them up and then waits for the response after signaling the remote side. 2) Service running on the remote side that dequeues the messages from the queue and dispatches them for processing. Skel: Auto generated code that takes care of un-marshaling parameters Object: Method implementation Most of the work is derived from various downstream Qualcomm kernels. Credits to various Qualcomm authors who have contributed to this code. Specially Tharun Kumar Merugu Keeping the first version simple, below are few things are TODO: - Support INIT_STATIC process - Support remote mmap/unmap methods. - Handling secure compute context banks. - Add secure buffer support This patchset has been tested on DB410c(msm8916), DB820c (msm8996), SDM845 Qualcomm SoCs with sample apps like matrix multiply, calculator from Hexagon SDK. Thanks, srini Srinivas Kandagatla (5): char: dt-bindings: Add Qualcomm Fastrpc bindings char: fastrpc: Add Qualcomm fastrpc basic driver model char: fastrpc: Add support for context Invoke method char: fastrpc: Add support for create remote init process char: fastrpc: Add support for dmabuf exporter Thierry Escande (1): char: fastrpc: Add support for compat ioctls .../devicetree/bindings/char/qcom,fastrpc.txt | 73 + drivers/char/Kconfig | 10 + drivers/char/Makefile | 1 + drivers/char/fastrpc.c | 1749 +++++++++++++++++ include/uapi/linux/fastrpc.h | 82 + 5 files changed, 1915 insertions(+) create mode 100644 Documentation/devicetree/bindings/char/qcom,fastrpc.txt create mode 100644 drivers/char/fastrpc.c create mode 100644 include/uapi/linux/fastrpc.h -- 2.19.2