Use procfs instead of dmesg to print runlist

`cat /proc/runlist` to print the current runlist.

Also break nvdebug.c into nvdebug_entry.c, runlist.c, and
runlist_procfs.c.

1 files changed, 40 insertions, 0 deletions

diff --git a/nvdebug_entry.c b/nvdebug_entry.c
new file mode 100644
index 0000000..148bd3f
--- /dev/null
+++ b/nvdebug_entry.c
@@ -0,0 +1,40 @@
+/* Copyright 2021 Joshua Bakita
+ * SPDX-License-Identifier: MIT
+ */
+
+/* TODO
+ * - Add sysfs trigger for a preemption
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h> // So we can set up entries in /proc
+
+#include "nvdebug.h"
+
+// LIAR. But without this we can't use GPL-only exported symbols like
+// platform_bus_type or bus_find_device_by_name...
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joshua Bakita");
+MODULE_DESCRIPTION("A scheduling debugging module for NVIDIA GPUs");
+MODULE_SOFTDEP("pre: nvgpu"); // We only support the Jetson boards for now
+
+extern const struct file_operations runlist_file_ops;
+
+int __init nvdebug_init(void) {
+        struct proc_dir_entry *entry = proc_create("runlist", 0444, NULL, &runlist_file_ops);
+        if (!entry) {
+                remove_proc_entry("runlist", NULL);
+                printk(KERN_ERR "[nvdebug] Unable to initialize procfs entries!\n");
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static void __exit nvdebug_exit(void) {
+        remove_proc_entry("runlist", NULL);
+        printk(KERN_INFO "[nvdebug] Exiting...\n");
+}
+
+module_init(nvdebug_init);
+module_exit(nvdebug_exit);