This patch series adds a character device interface to remoteproc framework. Currently there is only a sysfs interface which the userspace clients can use. If a usersapce application crashes after booting the remote processor through the sysfs interface the remote processor does not get any indication about the crash. It might still assume that the application is running. For example modem uses remotefs service to data from disk/flash memory. If the remotefs service crashes, modem still keeps on requesting data which might lead to crash on modem. Even if the service is restarted the file handles modem requested previously would become stale. Adding a character device interface makes the remote processor tightly coupled with the user space application. A crash of the application leads to a close on the file descriptors therefore shutting down the remoteproc. Changelog: v2 -> v3: - Move booting of remoteproc from open to a write call. - Add ioctl interface for future functionality extension. - Add an ioctl call to default to rproc shutdown on release. v2 -> v1: - Fixed comments from Bjorn and Matthew. Rishabh Bhatnagar (2): remoteproc: Add remoteproc character device interface remoteproc: core: Register the character device interface Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + drivers/remoteproc/Kconfig | 9 ++ drivers/remoteproc/Makefile | 1 + drivers/remoteproc/remoteproc_cdev.c | 142 +++++++++++++++++++++ drivers/remoteproc/remoteproc_core.c | 10 ++ drivers/remoteproc/remoteproc_internal.h | 21 +++ include/linux/remoteproc.h | 3 + include/uapi/linux/remoteproc_cdev.h | 21 +++ 8 files changed, 208 insertions(+) create mode 100644 drivers/remoteproc/remoteproc_cdev.c create mode 100644 include/uapi/linux/remoteproc_cdev.h -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
