| Message ID | 20231019090128.430297-2-umang.jain@ideasonboard.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | staging: vc04_services: Tweak module autoloading support | expand |
Hi Umang, Thank you for the patch. On Thu, Oct 19, 2023 at 02:31:26PM +0530, Umang Jain wrote: > VC04 has now a independent bus vchiq_bus to register its devices. > However, the module auto-loading for bcm2835-audio and bcm2835-camera > currently happens through MODULE_ALIAS() macro specified explicitly. > > The correct way to auto-load a module, is when the alias is picked > out from MODULE_DEVICE_TABLE(). In order to get there, we need to > introduce vchiq_device_id and add relevant entries in file2alias.c > infrastructure so that aliases can be generated. This patch targets > adding vchiq_device_id and do_vchiq_entry, in order to > generate those alias using the /script/mod/file2alias.c. > > Going forward the MODULE_ALIAS() from bcm2835-camera and bcm2835-audio > will be dropped, in favour of MODULE_DEVICE_TABLE being used there. > > The alias format for vchiq_bus devices will be "vchiq:<dev_name>". > Adjust the vchiq_bus_uevent() to reflect that. > > Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > .../vc04_services/interface/vchiq_arm/vchiq_bus.c | 2 +- > .../vc04_services/interface/vchiq_arm/vchiq_bus.h | 3 +++ > include/linux/mod_devicetable.h | 4 ++++ > scripts/mod/devicetable-offsets.c | 3 +++ > scripts/mod/file2alias.c | 9 +++++++++ > 5 files changed, 20 insertions(+), 1 deletion(-) > > diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c > index 4ac3491efe45..8e40e006f14b 100644 > --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c > +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c > @@ -26,7 +26,7 @@ static int vchiq_bus_uevent(const struct device *dev, struct kobj_uevent_env *en > { > const struct vchiq_device *device = container_of_const(dev, struct vchiq_device, dev); > > - return add_uevent_var(env, "MODALIAS=%s", dev_name(&device->dev)); > + return add_uevent_var(env, "MODALIAS=vchiq:%s", dev_name(&device->dev)); > } > > static int vchiq_bus_probe(struct device *dev) > diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h > index 7eaaf9a91cda..caa6fdf25bb1 100644 > --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h > +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h > @@ -7,6 +7,7 @@ > #define _VCHIQ_DEVICE_H > > #include <linux/device.h> > +#include <linux/mod_devicetable.h> > > struct vchiq_device { > struct device dev; > @@ -18,6 +19,8 @@ struct vchiq_driver { > int (*resume)(struct vchiq_device *device); > int (*suspend)(struct vchiq_device *device, > pm_message_t state); > + > + const struct vchiq_device_id *id_table; > struct device_driver driver; > }; > > diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h > index b0678b093cb2..700cbf34c3b8 100644 > --- a/include/linux/mod_devicetable.h > +++ b/include/linux/mod_devicetable.h > @@ -946,4 +946,8 @@ struct cdx_device_id { > __u32 override_only; > }; > > +struct vchiq_device_id { > + char name[32]; > +}; > + > #endif /* LINUX_MOD_DEVICETABLE_H */ > diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c > index abe65f8968dd..e8aadc780da5 100644 > --- a/scripts/mod/devicetable-offsets.c > +++ b/scripts/mod/devicetable-offsets.c > @@ -267,5 +267,8 @@ int main(void) > DEVID_FIELD(cdx_device_id, device); > DEVID_FIELD(cdx_device_id, override_only); > > + DEVID(vchiq_device_id); > + DEVID_FIELD(vchiq_device_id, name); > + > return 0; > } > diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c > index 38120f932b0d..78dfae5a8720 100644 > --- a/scripts/mod/file2alias.c > +++ b/scripts/mod/file2alias.c > @@ -1478,6 +1478,14 @@ static int do_cdx_entry(const char *filename, void *symval, > return 1; > } > > +static int do_vchiq_entry(const char *filename, void *symval, char *alias) > +{ > + DEF_FIELD_ADDR(symval, vchiq_device_id, name); > + sprintf(alias, "vchiq:%s", *name); > + > + return 1; > +} > + > /* Does namelen bytes of name exactly match the symbol? */ > static bool sym_is(const char *name, unsigned namelen, const char *symbol) > { > @@ -1558,6 +1566,7 @@ static const struct devtable devtable[] = { > {"dfl", SIZE_dfl_device_id, do_dfl_entry}, > {"ishtp", SIZE_ishtp_device_id, do_ishtp_entry}, > {"cdx", SIZE_cdx_device_id, do_cdx_entry}, > + {"vchiq", SIZE_vchiq_device_id, do_vchiq_entry}, > }; > > /* Create MODULE_ALIAS() statements. > -- > 2.40.1 >
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c index 4ac3491efe45..8e40e006f14b 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.c @@ -26,7 +26,7 @@ static int vchiq_bus_uevent(const struct device *dev, struct kobj_uevent_env *en { const struct vchiq_device *device = container_of_const(dev, struct vchiq_device, dev); - return add_uevent_var(env, "MODALIAS=%s", dev_name(&device->dev)); + return add_uevent_var(env, "MODALIAS=vchiq:%s", dev_name(&device->dev)); } static int vchiq_bus_probe(struct device *dev) diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h index 7eaaf9a91cda..caa6fdf25bb1 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_bus.h @@ -7,6 +7,7 @@ #define _VCHIQ_DEVICE_H #include <linux/device.h> +#include <linux/mod_devicetable.h> struct vchiq_device { struct device dev; @@ -18,6 +19,8 @@ struct vchiq_driver { int (*resume)(struct vchiq_device *device); int (*suspend)(struct vchiq_device *device, pm_message_t state); + + const struct vchiq_device_id *id_table; struct device_driver driver; }; diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index b0678b093cb2..700cbf34c3b8 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -946,4 +946,8 @@ struct cdx_device_id { __u32 override_only; }; +struct vchiq_device_id { + char name[32]; +}; + #endif /* LINUX_MOD_DEVICETABLE_H */ diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c index abe65f8968dd..e8aadc780da5 100644 --- a/scripts/mod/devicetable-offsets.c +++ b/scripts/mod/devicetable-offsets.c @@ -267,5 +267,8 @@ int main(void) DEVID_FIELD(cdx_device_id, device); DEVID_FIELD(cdx_device_id, override_only); + DEVID(vchiq_device_id); + DEVID_FIELD(vchiq_device_id, name); + return 0; } diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index 38120f932b0d..78dfae5a8720 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -1478,6 +1478,14 @@ static int do_cdx_entry(const char *filename, void *symval, return 1; } +static int do_vchiq_entry(const char *filename, void *symval, char *alias) +{ + DEF_FIELD_ADDR(symval, vchiq_device_id, name); + sprintf(alias, "vchiq:%s", *name); + + return 1; +} + /* Does namelen bytes of name exactly match the symbol? */ static bool sym_is(const char *name, unsigned namelen, const char *symbol) { @@ -1558,6 +1566,7 @@ static const struct devtable devtable[] = { {"dfl", SIZE_dfl_device_id, do_dfl_entry}, {"ishtp", SIZE_ishtp_device_id, do_ishtp_entry}, {"cdx", SIZE_cdx_device_id, do_cdx_entry}, + {"vchiq", SIZE_vchiq_device_id, do_vchiq_entry}, }; /* Create MODULE_ALIAS() statements.
VC04 has now a independent bus vchiq_bus to register its devices. However, the module auto-loading for bcm2835-audio and bcm2835-camera currently happens through MODULE_ALIAS() macro specified explicitly. The correct way to auto-load a module, is when the alias is picked out from MODULE_DEVICE_TABLE(). In order to get there, we need to introduce vchiq_device_id and add relevant entries in file2alias.c infrastructure so that aliases can be generated. This patch targets adding vchiq_device_id and do_vchiq_entry, in order to generate those alias using the /script/mod/file2alias.c. Going forward the MODULE_ALIAS() from bcm2835-camera and bcm2835-audio will be dropped, in favour of MODULE_DEVICE_TABLE being used there. The alias format for vchiq_bus devices will be "vchiq:<dev_name>". Adjust the vchiq_bus_uevent() to reflect that. Signed-off-by: Umang Jain <umang.jain@ideasonboard.com> --- .../vc04_services/interface/vchiq_arm/vchiq_bus.c | 2 +- .../vc04_services/interface/vchiq_arm/vchiq_bus.h | 3 +++ include/linux/mod_devicetable.h | 4 ++++ scripts/mod/devicetable-offsets.c | 3 +++ scripts/mod/file2alias.c | 9 +++++++++ 5 files changed, 20 insertions(+), 1 deletion(-)