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path: root/drivers/remoteproc/remoteproc_sysfs.c
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2022-04-14remoteproc: core: Move state checking to remoteproc_coreShengjiu Wang1-7/+0
There is no mutex protection of these state checking for 'stop' and 'detach' which can't guarantee there is no another instance is trying to do same operation. Consider two instances case: Instance1: echo stop > /sys/class/remoteproc/remoteproc0/state Instance2: echo stop > /sys/class/remoteproc/remoteproc0/state The issue is that the instance2 case may success, Or it may fail with -EINVAL, which is uncertain. So move this state checking in rproc_cdev_write() and state_store() for 'stop', 'detach' operation to 'rproc_shutdown' , 'rproc_detach' function under the mutex protection. Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> Link: https://lore.kernel.org/r/1648434012-16655-3-git-send-email-shengjiu.wang@nxp.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
2022-04-14remoteproc: core: Remove state checking before calling rproc_boot()Shengjiu Wang1-4/+0
There is no mutex protection of the state checking before rproc_boot(), which can't guarantee there is no another instance is trying to do same operation. Consider two instances case: Instance1: echo start > /sys/class/remoteproc/remoteproc0/state Instance2: echo start > /sys/class/remoteproc/remoteproc0/state ... Instance2: echo stop > /sys/class/remoteproc/remoteproc0/state ... Instance1: echo stop > /sys/class/remoteproc/remoteproc0/state The one issue is that the instance2 case may success when 'start' happens at same time as instance1, then rproc->power = 2; Or it may fail with -BUSY, then rproc->power = 1; which is uncertain. The another issue is for 'stop' operation, if the rproc->power = 1, when instance2 'stop' the remoteproc the instance1 will be impacted for it still needs the service at that time. The reference counter rproc->power is used to manage state changing and there is mutex protection in each operation function for multi instance case. So remove this state checking in rproc_cdev_write() and state_store() for 'start' operation, just let reference counter rproc->power to manage the behaviors. Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> Link: https://lore.kernel.org/r/1648434012-16655-2-git-send-email-shengjiu.wang@nxp.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
2022-03-11remoteproc: Change rproc_shutdown() to return a statusSuman Anna1-1/+1
The rproc_shutdown() function is currently not returning any error code, and any failures within rproc_stop() are not passed back to the users. Change the signature to return a success value back to the callers. The remoteproc sysfs and cdev interfaces are also updated to return back this status to userspace. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20220213201246.25952-2-s-anna@ti.com
2022-03-04remoteproc: Introduce sysfs_read_only flagPuranjay Mohan1-1/+18
The remoteproc framework provides sysfs interfaces for changing the firmware name and for starting/stopping a remote processor through the sysfs files 'state' and 'firmware'. The 'coredump' file is used to set the coredump configuration. The 'recovery' sysfs file can also be used similarly to control the error recovery state machine of a remoteproc. These interfaces are currently allowed irrespective of how the remoteprocs were booted (like remoteproc self auto-boot, remoteproc client-driven boot etc). These interfaces can adversely affect a remoteproc and its clients especially when a remoteproc is being controlled by a remoteproc client driver(s). Also, not all remoteproc drivers may want to support the sysfs interfaces by default. Add support to make the remoteproc sysfs files read only by introducing a state flag 'sysfs_read_only' that the individual remoteproc drivers can set based on their usage needs. The default behavior is to allow the sysfs operations as before. Implement attribute_group->is_visible() to make the sysfs entries read only when 'sysfs_read_only' flag is set. Signed-off-by: Puranjay Mohan <p-mohan@ti.com> Link: https://lore.kernel.org/r/20220216081224.9956-2-p-mohan@ti.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
2021-03-18remoteproc: Properly deal with a detach request when attachedMathieu Poirier1-0/+5
This patch introduces the capability to detach a remote processor that has been attached to by the remoteproc core. For that to happen a rproc::ops::detach() operation needs to be available. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20210312162453.1234145-17-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2021-03-18remoteproc: Properly deal with a stop request when attachedMathieu Poirier1-1/+2
Allow a remote processor that was started by another entity to be switched off by the remoteproc core. For that to happen a rproc::ops::stop() operation needs to be available. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20210312162453.1234145-16-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2021-03-18remoteproc: Properly deal with a start request when attachedMathieu Poirier1-1/+2
This patch takes into account scenarios where a remote processor has been attached to when receiving a "start" command from sysfs. As with the case with the running state, the command can't be carried out if the remote processor is already in operation. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20210312162453.1234145-15-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2021-03-18remoteproc: Properly represent the attached stateMathieu Poirier1-4/+1
There is a need to know when a remote processor has been attached to rather than booted by the remoteproc core. In order to avoid manipulating two variables, i.e rproc::autonomous and rproc::state, get rid of the former and simply use the newly introduced RPROC_ATTACHED state. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20210312162453.1234145-5-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2021-03-18remoteproc: Add new RPROC_ATTACHED stateMathieu Poirier1-0/+1
Add a new RPROC_ATTACHED state to take into account scenarios where the remoteproc core needs to attach to a remote processor that is booted by another entity. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20210312162453.1234145-4-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2021-03-08remoteproc: sysfs: Use sysfs_emit instead of sprintfRaghavendra Rao Ananta1-2/+2
For security reasons sysfs_emit() is preferred over sprintf(). Hence, convert the remoteproc's sysfs show functions accordingly. Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org> Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org> Link: https://lore.kernel.org/r/1614808022-26062-1-git-send-email-sidgup@codeaurora.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2020-11-26remoteproc: Add a rproc_set_firmware() APISuman Anna1-31/+2
A new API, rproc_set_firmware() is added to allow the remoteproc platform drivers and remoteproc client drivers to be able to configure a custom firmware name that is different from the default name used during remoteproc registration. This function is being introduced to provide a kernel-level equivalent of the current sysfs interface to remoteproc client drivers, and can only change firmwares when the remoteproc is offline. This allows some remoteproc drivers to choose different firmwares at runtime based on the functionality the remote processor is providing. The TI PRU Ethernet driver will be an example of such usage as it requires to use different firmwares for different supported protocols. Also, update the firmware_store() function used by the sysfs interface to reuse this function to avoid code duplication. Reviewed-by: Rishabh Bhatnagar <rishabhb@codeaurora.org> Signed-off-by: Suman Anna <s-anna@ti.com> Link: https://lore.kernel.org/r/20201121032042.6195-1-s-anna@ti.com Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2020-10-14remoteproc: Add recovery configuration to the sysfs interfaceRishabh Bhatnagar1-0/+56
Add recovery configuration to the sysfs interface. This will allow usage of this configuration feature in production devices where access to debugfs might be limited. Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org> Link: https://lore.kernel.org/r/1601662144-5964-4-git-send-email-rishabhb@codeaurora.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2020-10-14remoteproc: Add coredump as part of sysfs interfaceRishabh Bhatnagar1-0/+63
Add coredump as part of the sysfs interface. This will allow usage of this configuration feature in production devices where access to debugfs might be limited. Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org> Link: https://lore.kernel.org/r/1601662144-5964-3-git-send-email-rishabhb@codeaurora.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2020-07-17remoteproc: Properly handle firmware name when attachingMathieu Poirier1-2/+14
This patch prevents the firmware image name from being displayed when the remoteproc core is attaching to a remote processor. This is needed needed since there is no guarantee about the nature of the firmware image that is loaded by the external entity. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Tested-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20200714195035.1426873-10-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2020-07-17remoteproc: Add new RPROC_DETACHED stateMathieu Poirier1-0/+1
Add a new RPROC_DETACHED state to take into account scenarios where the remoteproc core needs to attach to a remote processor that is booted by another entity. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Tested-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20200714195035.1426873-2-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2020-04-17remoteproc: pull in slab.hMichael S. Tsirkin1-0/+1
In preparation to virtio header changes, include slab.h directly as this module is using it. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2019-08-27remoteproc: Add a sysfs interface for nameSuman Anna1-0/+11
This patch adds a sysfs interface that provides the name of the remote processor to userspace. This allows the userspace to identify a remote processor as the remoteproc devices themselves are created based on probe order and can change from one boot to another or at runtime. The name is made available in debugfs originally, and is being retained for now. This can be cleaned up after couple of releases once users get familiar with the new interface. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174Thomas Gleixner1-9/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-10-06remoteproc: Check for NULL firmwares in sysfs interfaceSuman Anna1-0/+5
The remoteproc framework provides a sysfs file 'firmware' for modifying the firmware image name from userspace. Add an additional check to ensure NULL firmwares are errored out right away, rather than getting a delayed error while requesting a firmware during the start of a remoteproc later on. Tested-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-01-31remoteproc: Add RPROC_DELETED stateSarangdhar Joshi1-0/+1
Add new state RPROC_DELETED to handle synchronization between rproc_del() and other operations on rproc. This state represents the rproc device that has been "deleted". CC: Loic Pallardy <loic.pallardy@st.com> CC: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2016-11-01remoteproc: Add a sysfs interface for firmware and stateMatt Redfearn1-0/+151
This patch adds a sysfs interface to rproc allowing the firmware name and processor state to be changed dynamically. State was previously available in debugfs, and is replicated here. The firmware file allows retrieval of the running firmware name, and a new one to be specified at run time, so long as the remote processor has been stopped. Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>