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remoteproc: Add remoteproc character device interface

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Add the character device interface into remoteproc framework.
This interface can be used in order to boot/shutdown remote
subsystems and provides a basic ioctl based interface to implement
supplementary functionality. An ioctl call is implemented to enable
the shutdown on release feature which will allow remote processors to
be shutdown when the controlling userspace application crashes or hangs.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
Link: https://lore.kernel.org/r/1596044401-22083-2-git-send-email-sidgup@codeaurora.org
[bjorn: s/int32_t/s32/ per checkpatch]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Siddharth Gupta
2020-07-29 10:40:00 -07:00
committed by Bjorn Andersson
parent 2f3ee5e481
commit 4476770881
7 changed files with 205 additions and 0 deletions
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5
include/linux/remoteproc.h
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@@ -38,6 +38,7 @@
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/virtio.h>
#include <linux/cdev.h>
#include <linux/completion.h>
#include <linux/idr.h>
#include <linux/of.h>
@@ -509,6 +510,8 @@ struct rproc_dump_segment {
* @autonomous: true if an external entity has booted the remote processor
* @dump_segments: list of segments in the firmware
* @nb_vdev: number of vdev currently handled by rproc
* @char_dev: character device of the rproc
* @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
*/
struct rproc {
struct list_head node;
@@ -546,6 +549,8 @@ struct rproc {
int nb_vdev;
u8 elf_class;
u16 elf_machine;
struct cdev cdev;
bool cdev_put_on_release;
};
/**