Date: Fri, 22 Nov 2002 20:35:46 +0100 From: Wilko Bulte <wkb@freebie.xs4all.nl> To: John Baldwin <jhb@FreeBSD.ORG> Cc: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/dev/acpica acpi_pcib_acpi.c Message-ID: <20021122203546.A17603@freebie.xs4all.nl> In-Reply-To: <200211221811.gAMIBD6m073000@repoman.freebsd.org>; from jhb@FreeBSD.ORG on Fri, Nov 22, 2002 at 10:11:13AM -0800 References: <200211221811.gAMIBD6m073000@repoman.freebsd.org>
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On Fri, Nov 22, 2002 at 10:11:13AM -0800, John Baldwin wrote: John, Could any of this cause the panics people were seeing on -stable with the patchset you provided? Wilko > jhb 2002/11/22 10:11:13 PST > > Modified files: > sys/dev/acpica acpi_pcib_acpi.c > Log: > According to the ACPI spec, the bus number of the child PCI bus of a host > to PCI bridge can be read be evaluating the _BBN method of the host to PCI > device. Unfortunately, there appear to be some lazy/ignorant/moronic/ > whatever BIOS writers that return 0 for _BBN for all host to PCI bridges in > the system. On a system with a single host to PCI bridge this is not a > problem as the child bus of that single bridge will be bus 0 anyway. > However, on systems with multiple host to PCI bridges and l/i/m/w BIOS > writers this is a major problem resulting in all but the first host to > PCI bridge failing to attach. So, this adds a workaround. > > If the _BBN of a host to PCI bridge is zero and pcib0 already exists > and is not us, the we use _ADR to look up our PCI function and slot > (we currently assume we are on bus 0) and use that to call > host_pcib_get_busno() to try and extract our bus number from config > registers on the host to PCI bridge device. If that fails, then we make > an evil assumption that ACPI's _SB_ namespace lays out the host to PCI > bridges in ascending order and use our pcib unit number as our bus > number. > > Approved by: re > > Revision Changes Path > 1.26 +52 -7 src/sys/dev/acpica/acpi_pcib_acpi.c ---end of quoted text--- -- | / o / /_ _ wilko@FreeBSD.org |/|/ / / /( (_) Bulte Arnhem, the Netherlands To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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