Messages in this thread | | | Subject | Re: [PATCH V5 2/6] modpost: add support for mdev class id | From | Jason Wang <> | Date | Thu, 24 Oct 2019 11:31:04 +0800 |
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On 2019/10/24 上午5:42, Alex Williamson wrote: > On Wed, 23 Oct 2019 21:07:48 +0800 > Jason Wang <jasowang@redhat.com> wrote: > >> Add support to parse mdev class id table. >> >> Reviewed-by: Parav Pandit <parav@mellanox.com> >> Signed-off-by: Jason Wang <jasowang@redhat.com> >> --- >> 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.
> >> 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.
Thanks
> > Alex > >> + return 1; >> +} >> + >> /* Does namelen bytes of name exactly match the symbol? */ >> static bool sym_is(const char *name, unsigned namelen, const char *symbol) >> { >> @@ -1407,6 +1416,7 @@ static const struct devtable devtable[] = { >> {"typec", SIZE_typec_device_id, do_typec_entry}, >> {"tee", SIZE_tee_client_device_id, do_tee_entry}, >> {"wmi", SIZE_wmi_device_id, do_wmi_entry}, >> + {"mdev", SIZE_mdev_class_id, do_mdev_entry}, >> }; >> >> /* Create MODULE_ALIAS() statements.
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