Feather-Trace: register devices with sysfs

This patch implements support for Feather-Trace devices to use the sysfs
file system and, consequently, udev support.

This allows us to allocate major/minor numbers for Feather-Trace
devices dynamically, which is desirable because our old static
allocations tend to create conflicts on modern distributions and/or
when there are many cores.

1 files changed, 5 insertions, 2 deletions

diff --git a/include/litmus/ftdev.h b/include/litmus/ftdev.h
index 7697b4616699..efb2a5c9a9b0 100644
--- a/include/litmus/ftdev.h
+++ b/include/litmus/ftdev.h
@@ -28,10 +28,13 @@ struct ftdev_minor {
         struct mutex            lock;
         /* FIXME: filter for authorized events */
         struct ftdev_event*     events;
+        struct device*          device;
 };
 
 struct ftdev {
         struct cdev             cdev;
+        struct class*           class;
+        const char*             name;
         /* FIXME: don't waste memory, allocate dynamically */
         struct ftdev_minor      minor[MAX_FTDEV_MINORS];
         unsigned int            minor_cnt;
@@ -43,7 +46,7 @@ struct ftdev {
 struct ft_buffer* alloc_ft_buffer(unsigned int count, size_t size);
 void free_ft_buffer(struct ft_buffer* buf);
 
-void ftdev_init(struct ftdev* ftdev, struct module* owner);
-int register_ftdev(struct ftdev* ftdev, const char* name, int major);
+void ftdev_init(struct ftdev* ftdev, struct module* owner, const char* name);
+int register_ftdev(struct ftdev* ftdev);
 
 #endif