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remoteproc: Add recovery configuration to the sysfs interface

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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>
This commit is contained in:
Rishabh Bhatnagar 2020-10-02 11:09:04 -07:00 committed by Bjorn Andersson
parent f75c6043a3
commit 526b9e0cf3
2 changed files with 76 additions and 0 deletions
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20
Documentation/ABI/testing/sysfs-class-remoteproc
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@ -82,3 +82,23 @@ Description: Remote processor coredump configuration
processor's device memory. Extra buffer will not be used to
copy the dump. Also recovery process will not proceed until
all data is read by usersapce.
What: /sys/class/remoteproc/.../recovery
Date: July 2020
Contact: Bjorn Andersson <bjorn.andersson@linaro.org>, Ohad Ben-Cohen <ohad@wizery.com>
Description: Remote processor recovery mechanism
Reports the recovery mechanism of the remote processor,
which will be one of:
"enabled"
"disabled"
"enabled" means, the remote processor will be automatically
recovered whenever it crashes. Moreover, if the remote
processor crashes while recovery is disabled, it will
be automatically recovered too as soon as recovery is enabled.
"disabled" means, a remote processor will remain in a crashed
state if it crashes. This is useful for debugging purposes;
without it, debugging a crash is substantially harder.

56
drivers/remoteproc/remoteproc_sysfs.c
View File

@ -10,6 +10,61 @@
#define to_rproc(d) container_of(d, struct rproc, dev)
static ssize_t recovery_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rproc *rproc = to_rproc(dev);
return sprintf(buf, "%s", rproc->recovery_disabled ? "disabled\n" : "enabled\n");
}
/*
* By writing to the 'recovery' sysfs entry, we control the behavior of the
* recovery mechanism dynamically. The default value of this entry is "enabled".
*
* The 'recovery' sysfs entry supports these commands:
*
* enabled: When enabled, the remote processor will be automatically
* recovered whenever it crashes. Moreover, if the remote
* processor crashes while recovery is disabled, it will
* be automatically recovered too as soon as recovery is enabled.
*
* disabled: When disabled, a remote processor will remain in a crashed
* state if it crashes. This is useful for debugging purposes;
* without it, debugging a crash is substantially harder.
*
* recover: This function will trigger an immediate recovery if the
* remote processor is in a crashed state, without changing
* or checking the recovery state (enabled/disabled).
* This is useful during debugging sessions, when one expects
* additional crashes to happen after enabling recovery. In this
* case, enabling recovery will make it hard to debug subsequent
* crashes, so it's recommended to keep recovery disabled, and
* instead use the "recover" command as needed.
*/
static ssize_t recovery_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct rproc *rproc = to_rproc(dev);
if (sysfs_streq(buf, "enabled")) {
/* change the flag and begin the recovery process if needed */
rproc->recovery_disabled = false;
rproc_trigger_recovery(rproc);
} else if (sysfs_streq(buf, "disabled")) {
rproc->recovery_disabled = true;
} else if (sysfs_streq(buf, "recover")) {
/* begin the recovery process without changing the flag */
rproc_trigger_recovery(rproc);
} else {
return -EINVAL;
}
return count;
}
static DEVICE_ATTR_RW(recovery);
/*
* A coredump-configuration-to-string lookup table, for exposing a
* human readable configuration via sysfs. Always keep in sync with
@ -201,6 +256,7 @@ static DEVICE_ATTR_RO(name);
static struct attribute *rproc_attrs[] = {
&dev_attr_coredump.attr,
&dev_attr_recovery.attr,
&dev_attr_firmware.attr,
&dev_attr_state.attr,
&dev_attr_name.attr,