Date: Tue, 04 Aug 2015 16:55:01 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 196980] [pci] PCI Resource Allocation Causing 2 em devices to fail during initialization Message-ID: <bug-196980-8-g5Em9Cc7vG@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-196980-8@https.bugs.freebsd.org/bugzilla/> References: <bug-196980-8@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196980 --- Comment #5 from John Baldwin <jhb@FreeBSD.org> --- This is not caused by MSI. The root issue is that the PCI bus only pre-reserves BARs for leaf devices, not the I/O windows of PCI-PCI bridges. The agp0 device probes before pcibX and it allocates a random page of physical address space that overlaps with the PCI-PCI bridge window. That then causes a conflict with reserving the PCI-PCI window. I have another PR I can't find at the moment where I've discussed the possible solutions. The most expedient is probably to have the PCI bus pre-reserve the resources for memory windows (I/O windows are much more complicated, but memory windows would be good enough for all the instances of this bug that I've seen so far). Also, this is not a regression in 10.2. I believe it has been an issue since NEW_PCIB was added, so 10.0 (and in older branches with the option enabled). -- You are receiving this mail because: You are the assignee for the bug.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-196980-8-g5Em9Cc7vG>