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Signed-off-by: anish kumar Reported-by: kernel test robot --- Documentation/staging/remoteproc.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/staging/remoteproc.rst b/Documentation/staging/r= emoteproc.rst index 348ee7e508ac..eeebbeca71de 100644 --- a/Documentation/staging/remoteproc.rst +++ b/Documentation/staging/remoteproc.rst @@ -29,6 +29,23 @@ remoteproc will add those devices. This makes it possibl= e to reuse the existing virtio drivers with remote processor backends at a minimal develo= pment cost. =20 +The primary purpose of the remoteproc framework is to download firmware +for remote processors and manage their lifecycle. The framework consists +of several key components: + +- **Character Driver**: Provides userspace access to control the remote + processor. +- **ELF Utility**: Offers functions for handling ELF files and managing + resources requested by the remote processor. +- **Remoteproc Core**: Manages firmware downloads and recovery actions + in case of a remote processor crash. +- **Coredump**: Provides facilities for coredumping and tracing from + the remote processor in the event of a crash. +- **Userspace Interaction**: Uses sysfs and debugfs to manage the + lifecycle and status of the remote processor. +- **Virtio Support**: Facilitates interaction with the virtio and + rpmsg bus. + User API =3D=3D=3D=3D=3D=3D=3D=3D =20 --=20 2.39.3 (Apple Git-146) From nobody Sun Nov 24 09:10:01 2024 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F1C40191F82; 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charset="utf-8" Added overview section which details how the remote processor framework works and how it handles crashes. Signed-off-by: anish kumar Reported-by: kernel test robot --- Documentation/staging/remoteproc.rst | 43 ++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/Documentation/staging/remoteproc.rst b/Documentation/staging/r= emoteproc.rst index eeebbeca71de..e0bf68ceade8 100644 --- a/Documentation/staging/remoteproc.rst +++ b/Documentation/staging/remoteproc.rst @@ -46,6 +46,49 @@ of several key components: - **Virtio Support**: Facilitates interaction with the virtio and rpmsg bus. =20 +Overview +=3D=3D=3D=3D=3D=3D=3D=3D + +The framework begins by gathering information about the firmware file +to be downloaded through the request_firmware function. It supports +the ELF format and parses the firmware image to identify the physical +addresses that need to be populated from the corresponding ELF sections. +Once this information is obtained from the driver, the framework transfers +the data to the specified addresses and starts the remote processor, +along with subdevices. + +Dependent devices, referred to as `subdevices` within the framework, +are also managed post-registration by their respective drivers. +Subdevices can register themselves using `rproc_(add/remove)_subdev`. +Non-remoteproc drivers can use subdevices as a way to logically connect +to remote and get lifecycle notifications of the remote. + +The framework oversees the lifecycle of the remote and +provides the `rproc_report_crash` function, which the driver invokes +upon receiving a crash notification from the remote. The +notification method can differ based on the design of the remote +processor and its communication with the application processor. For +instance, if the remote is a DSP equipped with a watchdog, +unresponsive behavior triggers the watchdog, generating an interrupt +that routes to the application processor, allowing it to call +`rproc_report_crash` in the driver's interrupt context. + +During crash handling, the framework performs the following actions: + +a. Sends a request to stop the remote and any connected or + dependent subdevices. +b. Generates a coredump, dumping all `resources` requested by the + remote alongside relevant debugging information. Resources are + explained below. +c. Reloads the firmware and restarts the remote processor. + +If the `RPROC_FEAT_ATTACH_ON_RECOVERY` flag is set, the detach and +attach callbacks of the driver are invoked without reloading the +firmware. This is useful when the remote requires no +assistance for recovery, or when the application processor can restart +independently. 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charset="utf-8" Added a note to the rproc_add description regarding the availability of the resource-managed variant of the API. Signed-off-by: anish kumar Reported-by: kernel test robot --- Documentation/staging/remoteproc.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/staging/remoteproc.rst b/Documentation/staging/r= emoteproc.rst index e0bf68ceade8..658ef7a28dd2 100644 --- a/Documentation/staging/remoteproc.rst +++ b/Documentation/staging/remoteproc.rst @@ -223,6 +223,14 @@ If found, those virtio devices will be created and add= ed, so as a result of registering this remote processor, additional virtio drivers might get probed. =20 +.. note:: + + there is a resource managed version of this api called devm_rproc_add. + Most of the times, you should use that unless you need to explicitly + control the rproc registration with the core. If you are using devm + variant of this api, then rproc_del will automatically get called when + driver is unloaded. + :: =20 int rproc_del(struct rproc *rproc) --=20 2.39.3 (Apple Git-146)