2020-04-01 00:05:11

by Rishabh Bhatnagar

Subject: [PATCH v2 2/2] remoteproc: core: Register the character device interface

Add the character device during rproc_add. This would create
a character device node at /dev/remoteproc<index>. Userspace
applications can interact with the remote processor using this
interface.

Signed-off-by: Rishabh Bhatnagar <[email protected]>
---
drivers/remoteproc/remoteproc_core.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 097f33e..76ba171 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1916,6 +1916,13 @@ int rproc_add(struct rproc *rproc)
/* create debugfs entries */
rproc_create_debug_dir(rproc);

+ /* add char device for this remoteproc */
+ ret = rproc_char_device_add(rproc);
+ if (ret) {
+ dev_err(dev, "Failed to add char dev for %s\n", rproc->name);
+ return ret;
+ }
+
/* if rproc is marked always-on, request it to boot */
if (rproc->auto_boot) {
ret = rproc_trigger_auto_boot(rproc);
@@ -2137,6 +2144,7 @@ int rproc_del(struct rproc *rproc)
mutex_unlock(&rproc->lock);

rproc_delete_debug_dir(rproc);
+ rproc_char_device_remove(rproc);

/* the rproc is downref'ed as soon as it's removed from the klist */
mutex_lock(&rproc_list_mutex);
@@ -2220,6 +2228,7 @@ static int __init remoteproc_init(void)
{
rproc_init_sysfs();
rproc_init_debugfs();
+ rproc_init_cdev();

return 0;
}
@@ -2231,6 +2240,7 @@ static void __exit remoteproc_exit(void)

rproc_exit_debugfs();
rproc_exit_sysfs();
+ rproc_exit_cdev();
}
module_exit(remoteproc_exit);

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

2020-04-01 19:53:25

by Bjorn Andersson

Subject: Re: [PATCH v2 2/2] remoteproc: core: Register the character device interface

On Tue 31 Mar 17:03 PDT 2020, Rishabh Bhatnagar wrote:

> Add the character device during rproc_add. This would create
> a character device node at /dev/remoteproc<index>. Userspace
> applications can interact with the remote processor using this
> interface.
>
> Signed-off-by: Rishabh Bhatnagar <[email protected]>
> ---

Reviewed-by: Bjorn Andersson <[email protected]>

Regards,
Bjorn

> drivers/remoteproc/remoteproc_core.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 097f33e..76ba171 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1916,6 +1916,13 @@ int rproc_add(struct rproc *rproc)
> /* create debugfs entries */
> rproc_create_debug_dir(rproc);
>
> + /* add char device for this remoteproc */
> + ret = rproc_char_device_add(rproc);
> + if (ret) {
> + dev_err(dev, "Failed to add char dev for %s\n", rproc->name);
> + return ret;
> + }
> +
> /* if rproc is marked always-on, request it to boot */
> if (rproc->auto_boot) {
> ret = rproc_trigger_auto_boot(rproc);
> @@ -2137,6 +2144,7 @@ int rproc_del(struct rproc *rproc)
> mutex_unlock(&rproc->lock);
>
> rproc_delete_debug_dir(rproc);
> + rproc_char_device_remove(rproc);
>
> /* the rproc is downref'ed as soon as it's removed from the klist */
> mutex_lock(&rproc_list_mutex);
> @@ -2220,6 +2228,7 @@ static int __init remoteproc_init(void)
> {
> rproc_init_sysfs();
> rproc_init_debugfs();
> + rproc_init_cdev();
>
> return 0;
> }
> @@ -2231,6 +2240,7 @@ static void __exit remoteproc_exit(void)
>
> rproc_exit_debugfs();
> rproc_exit_sysfs();
> + rproc_exit_cdev();
> }
> module_exit(remoteproc_exit);
>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project