On Fri, Jul 11, 2014 at 04:08:23PM +0100, Liviu Dudau wrote: > On Fri, Jul 11, 2014 at 03:11:16PM +0100, Catalin Marinas wrote: > > On Thu, Jul 10, 2014 at 11:36:10PM +0100, Bjorn Helgaas wrote: > > > Most of the rest of the v7 discussion was about "Introduce a domain > > > number for pci_host_bridge." I think we should add arm64 using the > > > existing pci_scan_root_bus() and keep the domain number in the arm64 > > > sysdata structure like every other arch does. Isn't that feasible? > > > We can worry about domain unification later. > > > > I think that's what we were trying to avoid, adding an arm64-specific > > pci_sys_data structure (and arm64-specific API). IIUC, avoiding this > > would allow the host controller drivers to use the sysdata pointer for > > their own private data structures. > > > > Also since you can specify the domain number via DT (and in Liviu's > > v8 patches read by of_create_pci_host_bridge), I think it would make > > sense to have it stored in some generic data structures (e.g. > > pci_host_bridge) rather than in an arm64 private sysdata. > > > > (Liviu is thinking of an alternative API but maybe he could briefly > > describe it here before posting a new series) > > My plan is to keep the domain number in the pci_host_bridge and split > the creation of the pci_host_bridge out of the pci_create_root_bus(). Wouldn't it make more sense to add domain_nr to the pci_bus structure (well, only needed for the root bus)? It would simplify pci_domain_nr() as well which only takes a pci_bus parameter. > The new function (tentatively called pci_create_new_root_bus()) will > no longer call pci_alloc_host_bridge() but will accept it as a > parameter, allowing one to be able to set the domain_nr ahead of the > root bus creation. If we place domain_nr in pci_bus, this split wouldn't help but we still need your original pci_create_root_bus_in_domain(). Are there other uses of your proposal above? Yet another alternative is to ignore PCI domains altogether (domain 0 always). -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
