On Tue, Dec 20, 2016 at 6:11 PM, Stephen Hemminger <step...@networkplumber.org> wrote: > On Tue, 20 Dec 2016 14:17:14 +0100 > Jan Blunck <jblu...@infradead.org> wrote: > >> On Fri, Dec 16, 2016 at 2:10 PM, Shreyansh Jain <shreyansh.j...@nxp.com> >> wrote: >> > This patch introduces the rte_bus abstraction for devices and drivers in >> > EAL framework. The model is: >> > - One or more buses are connected to a CPU (or core) >> > - One or more devices are conneted to a Bus >> > - Drivers are running instances which manage one or more devices >> > - Bus is responsible for identifying devices (and interrupt propogation) >> > - Driver is responsible for initializing the device >> > >> > This patch adds a 'rte_bus' class which rte_driver and rte_device refer. >> > This way, each device (rte_xxx_device) would have reference to the bus >> > it is based on. As well as, each driver (rte_xxx_driver) would have link >> > to the bus and devices on it for servicing. >> > >> > __ rte_bus_list >> > / >> > +----------'---+ >> > |rte_bus | >> > | driver_list------> List of rte_bus specific >> > | device_list---- devices >> > | | `-> List of rte_bus associated >> > | | drivers >> > +--|------|----+ >> > _________/ \_________ >> > +--------/----+ +-\---------------+ >> > |rte_device | |rte_driver | >> > | rte_bus | | rte_bus | >> > | rte_driver | | ... | >> > | ... | +---------...-----+ >> > | | ||| >> > +---||--------+ ||| >> > || ||| >> > | \ \\\ >> > | \_____________ \\\ >> > | \ ||| >> > +------|---------+ +----|----------+ ||| >> > |rte_pci_device | |rte_xxx_device | ||| >> > | .... | | .... | ||| >> > +----------------+ +---------------+ / | \ >> > / | \ >> > _____________________/ / \ >> > / ___/ \ >> > +-------------'--+ +------------'---+ +--'------------+ >> > |rte_pci_driver | |rte_vdev_driver | |rte_xxx_driver | >> > | .... | | .... | | .... | >> > +----------------+ +----------------+ +---------------+ >> > >> > This patch only enables the bus references on rte_driver and rte_driver. >> > EAL wide global device and driver list continue to exist until an instance >> > of bus is added in subsequent patches. >> > >> > This patch also introduces RTE_REGISTER_BUS macro on the lines of >> > RTE_PMD_REGISTER_XXX. Key difference is that the constructor priority has >> > been explicitly set to 101 so as to execute bus registration before PMD. >> > >> > Signed-off-by: Shreyansh Jain <shreyansh.j...@nxp.com> >> > > > Ok, but let's keep this as bus type not bus. It gets really hard and complex > to enumerate all layers of PCI bus and bridges.
As far as I understand it this isn't the intention to replicate the hierarchy of buses we have in the kernel. The PCI bus in this case becomes a list of PCI devices.
