On 2019/10/25 上午3:54, Alex Williamson wrote:
On Thu, 24 Oct 2019 11:31:04 +0800
Jason Wang <jasowang@xxxxxxxxxx> wrote:
On 2019/10/24 上午5:42, Alex Williamson wrote:
On Wed, 23 Oct 2019 21:07:48 +0800
Jason Wang <jasowang@xxxxxxxxxx> wrote:
Add support to parse mdev class id table.
Reviewed-by: Parav Pandit <parav@xxxxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vfio/mdev/vfio_mdev.c | 2 ++
scripts/mod/devicetable-offsets.c | 3 +++
scripts/mod/file2alias.c | 10 ++++++++++
3 files changed, 15 insertions(+)
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index 7b24ee9cb8dd..cb701cd646f0 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -125,6 +125,8 @@ static const struct mdev_class_id id_table[] = {
{ 0 },
};
+MODULE_DEVICE_TABLE(mdev, id_table);
+
Two questions, first we have:
#define MODULE_DEVICE_TABLE(type, name) \
extern typeof(name) __mod_##type##__##name##_device_table \
__attribute__ ((unused, alias(__stringify(name))))
Therefore we're defining __mod_mdev__id_table_device_table with alias
id_table. When the virtio mdev bus driver is added in 5/6 it uses the
same name value. I see virtio types all register this way (virtio,
id_table), so I assume there's no conflict, but pci types mostly (not
entirely) seem to use unique names. Is there a preference to one way
or the other or it simply doesn't matter?
It looks to me that those symbol were local, so it doesn't matter. But
if you wish I can switch to use unique name.
I don't have a strong opinion, I'm just trying to make sure we're not
doing something obviously broken.
Yes, to be more safe I will switch to unique names here.
static struct mdev_driver vfio_mdev_driver = {
.name = "vfio_mdev",
.probe = vfio_mdev_probe,
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index 054405b90ba4..6cbb1062488a 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -231,5 +231,8 @@ int main(void)
DEVID(wmi_device_id);
DEVID_FIELD(wmi_device_id, guid_string);
+ DEVID(mdev_class_id);
+ DEVID_FIELD(mdev_class_id, id);
+
return 0;
}
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index c91eba751804..d365dfe7c718 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1335,6 +1335,15 @@ static int do_wmi_entry(const char *filename, void *symval, char *alias)
return 1;
}
+/* looks like: "mdev:cN" */
+static int do_mdev_entry(const char *filename, void *symval, char *alias)
+{
+ DEF_FIELD(symval, mdev_class_id, id);
+
+ sprintf(alias, "mdev:c%02X", id);
A lot of entries call add_wildcard() here, should we? Sorry for the
basic questions, I haven't played in this code. Thanks,
It's really good question. My understanding is we won't have a module
that can deal with all kinds of classes like CLASS_ID_ANY. So there's
probably no need for the wildcard.
The comment for add_wildcard() indicates future extension, so it's hard
to know what we might need in the future until we do need it. The
majority of modules.alias entries on my laptop (even if I exclude pci
aliases) end with a wildcard. Thanks,
Yes, so I will add that for future extension.
Thanks
Alex
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