On Tue, Mar 07, 2023 at 06:49:11PM +0530, Nipun Gupta wrote: > Introduce AMD CDX bus, which provides a mechanism for scanning > and probing CDX devices. These devices are memory mapped on > system bus for Application Processors(APUs). > > CDX devices can be changed dynamically in the Fabric and CDX > bus interacts with CDX controller to rescan the bus and > rediscover the devices. > > Signed-off-by: Nipun Gupta <nipun.gupta@xxxxxxx> > Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@xxxxxxx> > Tested-by: Nikhil Agarwal <nikhil.agarwal@xxxxxxx> > --- > Documentation/ABI/testing/sysfs-bus-cdx | 12 + > MAINTAINERS | 7 + > drivers/Kconfig | 2 + > drivers/Makefile | 1 + > drivers/cdx/Kconfig | 17 + > drivers/cdx/Makefile | 8 + > drivers/cdx/cdx.c | 407 ++++++++++++++++++++++++ > drivers/cdx/cdx.h | 62 ++++ > include/linux/cdx/cdx_bus.h | 147 +++++++++ > include/linux/mod_devicetable.h | 15 + > scripts/mod/devicetable-offsets.c | 4 + > scripts/mod/file2alias.c | 12 + > 12 files changed, 694 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-bus-cdx > create mode 100644 drivers/cdx/Kconfig > create mode 100644 drivers/cdx/Makefile > create mode 100644 drivers/cdx/cdx.c > create mode 100644 drivers/cdx/cdx.h > create mode 100644 include/linux/cdx/cdx_bus.h > > diff --git a/Documentation/ABI/testing/sysfs-bus-cdx b/Documentation/ABI/testing/sysfs-bus-cdx > new file mode 100644 > index 000000000000..063d1a0dd866 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-bus-cdx > @@ -0,0 +1,12 @@ > +What: /sys/bus/cdx/rescan > +Date: March 2023 > +Contact: nipun.gupta@xxxxxxx > +Description: > + Writing a non-zero value to this file cause rescan of the bus > + and devices on the CDX bus. Any new devices are scanned and > + added to the list of Linux devices and any devices removed are > + also deleted from Linux. > + > + For example:: > + > + # echo 1 > /sys/bus/cdx/rescan See my comments on patch 7/7 about "non-zero" not being a good idea. thanks, greg k-h
