diff options
Diffstat (limited to 'drivers/remoteproc/remoteproc_sysfs.c')
| -rw-r--r-- | drivers/remoteproc/remoteproc_sysfs.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c index eea514cec50e..d1cf7bf277c4 100644 --- a/drivers/remoteproc/remoteproc_sysfs.c +++ b/drivers/remoteproc/remoteproc_sysfs.c @@ -10,6 +10,123 @@ #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 + * 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 sprintf(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) @@ -138,6 +255,8 @@ static ssize_t name_show(struct device *dev, struct device_attribute *attr, 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, |