Module autoprobing support for virtio drivers.

This adds the logic to convert the virtio ids into module aliases, and
includes a modalias entry in sysfs and the env var to make probing work.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 18 insertions, 0 deletions

diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 91c15da2680b..d802b5afae89 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -525,6 +525,20 @@ static int do_ssb_entry(const char *filename,
         return 1;
 }
 
+/* Looks like: virtio:dNvN */
+static int do_virtio_entry(const char *filename, struct virtio_device_id *id,
+                           char *alias)
+{
+        id->device = TO_NATIVE(id->device);
+        id->vendor = TO_NATIVE(id->vendor);
+
+        strcpy(alias, "virtio:");
+        ADD(alias, "d", 1, id->device);
+        ADD(alias, "v", id->vendor != VIRTIO_DEV_ANY_ID, id->vendor);
+
+        return 1;
+}
+
 /* Ignore any prefix, eg. v850 prepends _ */
 static inline int sym_is(const char *symbol, const char *name)
 {
@@ -651,6 +665,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
                 do_table(symval, sym->st_size,
                          sizeof(struct ssb_device_id), "ssb",
                          do_ssb_entry, mod);
+        else if (sym_is(symname, "__mod_virtio_device_table"))
+                do_table(symval, sym->st_size,
+                         sizeof(struct virtio_device_id), "virtio",
+                         do_virtio_entry, mod);
         free(zeros);
 }