| Message ID | 20190201130925.27066-1-srinivas.kandagatla@linaro.org |
|---|---|
| Headers | show |
| Series | misc: Add support to Qualcomm FastRPC driver | expand |
On Fri, Feb 01, 2019 at 01:09:21PM +0000, Srinivas Kandagatla wrote: > The FastRPC driver implements an IPC (Inter-Processor Communication) > mechanism that allows for clients to transparently make remote method > invocations across DSP and APPS boundaries. This enables developers > to offload tasks to the DSP and free up the application processor for > other tasks. > > Co-developed-by: Thierry Escande <thierry.escande@linaro.org> > Signed-off-by: Thierry Escande <thierry.escande@linaro.org> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > Reviewed-by: Rob Herring <robh@kernel.org> > --- > .../devicetree/bindings/misc/qcom,fastrpc.txt | 78 +++++++++++++++++++ > 1 file changed, 78 insertions(+) > create mode 100644 Documentation/devicetree/bindings/misc/qcom,fastrpc.txt What changed from v4? v2? v3? That needs to be somewhere in here, below the --- line or in the 00 email at the least to give us some idea of what is different. v6 please? thanks, greg k-h
Thanks for reviewing the v4, here is new version addressing the comments from v4. 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 <mtharu@codeaurora.org> 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 and QCS404 Qualcomm SoCs with sample apps like matrix multiply, calculator from Hexagon SDK. You can find more info on how to test this at: https://github.com/96boards/documentation/wiki/Dragonboard-Hexagon-DSP Changes since v4(https://patchwork.kernel.org/cover/10779341/) : - collected acks for DT from Rob. - Removed unnecessary list safe iteration spotted by Greg KH. - Removed unnecessary syslog spams. - Added more checks to input validity. Srinivas Kandagatla (5): misc: dt-bindings: Add Qualcomm Fastrpc bindings misc: fastrpc: Add Qualcomm fastrpc basic driver model misc: fastrpc: Add support for context Invoke method misc: fastrpc: Add support for create remote init process misc: fastrpc: Add support for dmabuf exporter .../devicetree/bindings/misc/qcom,fastrpc.txt | 78 + drivers/misc/Kconfig | 10 + drivers/misc/Makefile | 1 + drivers/misc/fastrpc.c | 1366 +++++++++++++++++ include/uapi/misc/fastrpc.h | 41 + 5 files changed, 1496 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/qcom,fastrpc.txt create mode 100644 drivers/misc/fastrpc.c create mode 100644 include/uapi/misc/fastrpc.h -- 2.20.1