Hi, I have been working on remoteproc/rpmsg and FreeRTOS/OpenAMP for the latest three months and recently, with my colleagues, I have started reasoning about the best possible way to expose the kernel rpmsg bus to applications running in user space. The idea is to end up with a clean mechanism for the user-kernel communication, like sockets or char devices, in order to build AMP applications on top of it. In fact, we have been running experiments with some out-of-tree drivers implementing exactly such interfaces, namely a driver registering a new address family AF_RPMSG for the socket interface, from Texas Instruments, and a char device driver representing different rpmsg channels with /dev/rpmsgX special files, found inside OpenAMP obsolete directory. I am quite new to kernel development and in particular to remoteproc subsystem, so I am asking the following questions because maybe I have missed some past developments and discussions about this topic. I apologize if this is the case. - Have you ever considered the inclusion of these out-of-tree modules in the mainline? - If so, have you planned some work on this, or what are the reasons for not including these modules? - Is there already a preferred way for exposing the rpmsg bus for generic services to userspace, or is the idea to have a different rpmsg driver, therefore a user-kernel communication strategy, for each different use case of the bus? Anyway, I would be very glad to contribute in the direction of an appropriate user-kernel interface for accessing the rpmsg bus, and at the moment I have a working test case for the socket driver as well as for the char driver. Given the fact I don't see the superiority of one approach compared to the other, I would like to propose and discuss with you both of them. This was kind of an introductory email. I am preparing two patchsets. Best regards, Matteo -- To unsubscribe from this list: send the line "unsubscribe linux-remoteproc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
