Date: Thu, 6 Feb 2014 16:43:37 -0500 From: John Baldwin <jhb@freebsd.org> To: Thomas Hoffmann <trh411@gmail.com> Cc: current@freebsd.org Subject: Re: [PATCH] PCI bus number management Message-ID: <201402061643.37058.jhb@freebsd.org> In-Reply-To: <CAB7-odksA_N2smB-s%2BbWYGjNVU_c3CFRbJ3scBw94Dm-sSy5xQ@mail.gmail.com> References: <201402061437.53355.jhb@freebsd.org> <CAB7-odksA_N2smB-s%2BbWYGjNVU_c3CFRbJ3scBw94Dm-sSy5xQ@mail.gmail.com>
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On Thursday, February 06, 2014 2:47:09 pm Thomas Hoffmann wrote: > On Thu, Feb 6, 2014 at 2:37 PM, John Baldwin <jhb@freebsd.org> wrote: > > > I have a patch to teach the PCI bus code and PCI-PCI bridge driver to > > manage > > PCI bus numbers. The approach is somewhat similar to how NEW_PCIB manages > > I/O > > windows for briges. Each bridge creates an rman to manage the bus numbers > > for > > all buses and bridges that live below it. Each bus allocates a bus > > resource > > from its parent bridge, and child bridges allocate their ranges from their > > parent devices. At the "top" of the PCI tree, the Host-PCI bridges > > allocate > > their respective bus ranges from their PCI domain/segment. There isn't > > really > > a device node for PCI domains, so I created a helper API that basically > > auto- > > creates a PCI bus rman for each domain on first use and then sub-allocates > > from that for Host-PCI bridges. > > > > The current patch (with some extra debugging) is at > > http://people.FreeBSD.org/~jhb/patches/pci_bus_rman.3.patch > > > > I would like to commit this to HEAD soon but thought I would post it for > > some > > pre-commit testing for the brave. :) If you are really brave, try booting > > with 'hw.pci.clear_buses=1' which will force the kernel to renumber all > > buses > > in the system. If you are really, really brave, try booting with > > 'hw.pci.clear_bars=1', 'hw.pci.clear_buses=1', and 'hw.pci.clear_pcib=1'. > > (My > > laptop survives with all those set) > > > > Note that the patch only enables bus number management on amd64 and i386. > > I > > believe ia64 just needs to define PCI_RES_BUS for this to work since it > > mandates ACPI. Porting this to other platforms requires handling > > PCI_RES_BUS > > rseources for Host-PCI bridges in bus_alloc_resource(), > > bus_adjust_resource(), > > and bus_release_resource(). > > > > -- > > John Baldwin > > > > I get a "404 - Not Found" trying to follow the link. Oops, it is: http://people.freebsd.org/~jhb/patches/pci_bus_rman3.patch -- John Baldwin
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