mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Mathieu Poirier](/assets/img/avatar_default.png)
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>
269 lines
7.5 KiB
C
269 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Remote Processor Framework
|
|
*/
|
|
|
|
#include <linux/remoteproc.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "remoteproc_internal.h"
|
|
|
|
#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 sysfs_emit(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
|
|
* enum rproc_coredump_mechanism
|
|
*/
|
|
static const char * const rproc_coredump_str[] = {
|
|
[RPROC_COREDUMP_DISABLED] = "disabled",
|
|
[RPROC_COREDUMP_ENABLED] = "enabled",
|
|
[RPROC_COREDUMP_INLINE] = "inline",
|
|
};
|
|
|
|
/* Expose the current coredump configuration via debugfs */
|
|
static ssize_t coredump_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rproc *rproc = to_rproc(dev);
|
|
|
|
return sysfs_emit(buf, "%s\n", rproc_coredump_str[rproc->dump_conf]);
|
|
}
|
|
|
|
/*
|
|
* By writing to the 'coredump' sysfs entry, we control the behavior of the
|
|
* coredump mechanism dynamically. The default value of this entry is "default".
|
|
*
|
|
* The 'coredump' sysfs entry supports these commands:
|
|
*
|
|
* disabled: This is the default coredump mechanism. Recovery will proceed
|
|
* without collecting any dump.
|
|
*
|
|
* default: When the remoteproc crashes the entire coredump will be
|
|
* copied to a separate buffer and exposed to userspace.
|
|
*
|
|
* inline: The coredump will not be copied to a separate buffer and the
|
|
* recovery process will have to wait until data is read by
|
|
* userspace. But this avoid usage of extra memory.
|
|
*/
|
|
static ssize_t coredump_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct rproc *rproc = to_rproc(dev);
|
|
|
|
if (rproc->state == RPROC_CRASHED) {
|
|
dev_err(&rproc->dev, "can't change coredump configuration\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (sysfs_streq(buf, "disabled")) {
|
|
rproc->dump_conf = RPROC_COREDUMP_DISABLED;
|
|
} else if (sysfs_streq(buf, "enabled")) {
|
|
rproc->dump_conf = RPROC_COREDUMP_ENABLED;
|
|
} else if (sysfs_streq(buf, "inline")) {
|
|
rproc->dump_conf = RPROC_COREDUMP_INLINE;
|
|
} else {
|
|
dev_err(&rproc->dev, "Invalid coredump configuration\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_RW(coredump);
|
|
|
|
/* Expose the loaded / running firmware name via sysfs */
|
|
static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rproc *rproc = to_rproc(dev);
|
|
const char *firmware = rproc->firmware;
|
|
|
|
/*
|
|
* If the remote processor has been started by an external
|
|
* entity we have no idea of what image it is running. As such
|
|
* simply display a generic string rather then rproc->firmware.
|
|
*/
|
|
if (rproc->state == RPROC_ATTACHED)
|
|
firmware = "unknown";
|
|
|
|
return sprintf(buf, "%s\n", firmware);
|
|
}
|
|
|
|
/* Change firmware name via sysfs */
|
|
static ssize_t firmware_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct rproc *rproc = to_rproc(dev);
|
|
int err;
|
|
|
|
err = rproc_set_firmware(rproc, buf);
|
|
|
|
return err ? err : count;
|
|
}
|
|
static DEVICE_ATTR_RW(firmware);
|
|
|
|
/*
|
|
* A state-to-string lookup table, for exposing a human readable state
|
|
* via sysfs. Always keep in sync with enum rproc_state
|
|
*/
|
|
static const char * const rproc_state_string[] = {
|
|
[RPROC_OFFLINE] = "offline",
|
|
[RPROC_SUSPENDED] = "suspended",
|
|
[RPROC_RUNNING] = "running",
|
|
[RPROC_CRASHED] = "crashed",
|
|
[RPROC_DELETED] = "deleted",
|
|
[RPROC_ATTACHED] = "attached",
|
|
[RPROC_DETACHED] = "detached",
|
|
[RPROC_LAST] = "invalid",
|
|
};
|
|
|
|
/* Expose the state of the remote processor via sysfs */
|
|
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rproc *rproc = to_rproc(dev);
|
|
unsigned int state;
|
|
|
|
state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
|
|
return sprintf(buf, "%s\n", rproc_state_string[state]);
|
|
}
|
|
|
|
/* Change remote processor state via sysfs */
|
|
static ssize_t state_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct rproc *rproc = to_rproc(dev);
|
|
int ret = 0;
|
|
|
|
if (sysfs_streq(buf, "start")) {
|
|
if (rproc->state == RPROC_RUNNING ||
|
|
rproc->state == RPROC_ATTACHED)
|
|
return -EBUSY;
|
|
|
|
ret = rproc_boot(rproc);
|
|
if (ret)
|
|
dev_err(&rproc->dev, "Boot failed: %d\n", ret);
|
|
} else if (sysfs_streq(buf, "stop")) {
|
|
if (rproc->state != RPROC_RUNNING &&
|
|
rproc->state != RPROC_ATTACHED)
|
|
return -EINVAL;
|
|
|
|
rproc_shutdown(rproc);
|
|
} else if (sysfs_streq(buf, "detach")) {
|
|
if (rproc->state != RPROC_ATTACHED)
|
|
return -EINVAL;
|
|
|
|
ret = rproc_detach(rproc);
|
|
} else {
|
|
dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
|
|
ret = -EINVAL;
|
|
}
|
|
return ret ? ret : count;
|
|
}
|
|
static DEVICE_ATTR_RW(state);
|
|
|
|
/* Expose the name of the remote processor via sysfs */
|
|
static ssize_t name_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rproc *rproc = to_rproc(dev);
|
|
|
|
return sprintf(buf, "%s\n", rproc->name);
|
|
}
|
|
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,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group rproc_devgroup = {
|
|
.attrs = rproc_attrs
|
|
};
|
|
|
|
static const struct attribute_group *rproc_devgroups[] = {
|
|
&rproc_devgroup,
|
|
NULL
|
|
};
|
|
|
|
struct class rproc_class = {
|
|
.name = "remoteproc",
|
|
.dev_groups = rproc_devgroups,
|
|
};
|
|
|
|
int __init rproc_init_sysfs(void)
|
|
{
|
|
/* create remoteproc device class for sysfs */
|
|
int err = class_register(&rproc_class);
|
|
|
|
if (err)
|
|
pr_err("remoteproc: unable to register class\n");
|
|
return err;
|
|
}
|
|
|
|
void __exit rproc_exit_sysfs(void)
|
|
{
|
|
class_unregister(&rproc_class);
|
|
}
|