Add coredump as part of 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@xxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-class-remoteproc | 24 +++++++++
drivers/remoteproc/remoteproc_sysfs.c | 63 ++++++++++++++++++++++++
2 files changed, 87 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-class-remoteproc b/Documentation/ABI/testing/sysfs-class-remoteproc
index 36094fb..050bd25 100644
--- a/Documentation/ABI/testing/sysfs-class-remoteproc
+++ b/Documentation/ABI/testing/sysfs-class-remoteproc
@@ -58,3 +58,27 @@ Description: Remote processor name
Reports the name of the remote processor. This can be used by
userspace in exactly identifying a remote processor and ease
up the usage in modifying the 'firmware' or 'state' files.
+
+What: /sys/class/remoteproc/.../coredump
+Date: July 2020
+Contact: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>, Ohad Ben-Cohen <ohad@xxxxxxxxxx>
+Description: Remote processor coredump configuration
+
+ Reports the coredump configuration of the remote processor,
+ which will be one of:
+
+ "disabled"
+ "enabled"
+ "inline"
+
+ "disabled" means no dump will be collected.
+
+ "enabled" means when the remote processor's coredump is
+ collected it will be copied to a separate buffer and that
+ buffer is exposed to userspace.
+
+ "inline" means when the remote processor's coredump is
+ collected userspace will directly read from the remote
+ 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.
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index eea514c..8500271 100644
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -10,6 +10,68 @@
#define to_rproc(d) container_of(d, struct rproc, dev)
+/*
+ * 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 +200,7 @@ 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_firmware.attr,
&dev_attr_state.attr,
&dev_attr_name.attr,
--
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