This adds the logic to convert the virtio ids into module aliases, and
includes a modalias entry in sysfs.
Unfortunately this does not seem sufficient to have the module
autoprobed at startup on my Ubuntu system. Greg? Am I missing some
udev magic?
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
---
drivers/virtio/virtio.c | 9 +++++++++
scripts/mod/file2alias.c | 18 ++++++++++++++++++
2 files changed, 27 insertions(+)
===================================================================
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -20,10 +20,19 @@ static ssize_t status_show(struct device
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
return sprintf(buf, "0x%08x", dev->config->get_status(dev));
}
+static ssize_t modalias_show(struct device *_d,
+ struct device_attribute *attr, char *buf)
+{
+ struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
+
+ return sprintf(buf, "virtio:d%08Xv%08X\n",
+ dev->id.device, dev->id.vendor);
+}
static struct device_attribute virtio_dev_attrs[] = {
__ATTR_RO(device),
__ATTR_RO(vendor),
__ATTR_RO(status),
+ __ATTR_RO(modalias),
__ATTR_NULL
};
===================================================================
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -484,6 +484,20 @@ static int do_parisc_entry(const char *f
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)
{
@@ -599,6 +613,10 @@ void handle_moddevtable(struct module *m
do_table(symval, sym->st_size,
sizeof(struct parisc_device_id), "parisc",
do_parisc_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);
}
/* Now add out buffered information to the generated C source */
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