Date: Tue, 6 Dec 2016 00:36:03 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r309588 - head/sys/dev/acpica Message-ID: <201612060036.uB60a3FU074933@repo.freebsd.org>
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Author: jhb Date: Tue Dec 6 00:36:02 2016 New Revision: 309588 URL: https://svnweb.freebsd.org/changeset/base/309588 Log: Don't attach to Host-PCI bridges with a bad bus number. If the bus number assigned to a Host-PCI bridge doesn't match the first bus number in the associated producer range from _CRS, print a warning and fail to attach rather than panicking due to an assertion failure. At least one single-socket Dell machine leaves a "ghost" Host-PCI bridge device in the ACPI namespace that seems to correspond to the I/O hub in the second socket of a two-socket machine. However, the BIOS doesn't configure the settings for this "ghost" bridge correctly, nor does it have any PCI devices behind it. Tested by: royger MFC after: 2 weeks Modified: head/sys/dev/acpica/acpi_pcib_acpi.c Modified: head/sys/dev/acpica/acpi_pcib_acpi.c ============================================================================== --- head/sys/dev/acpica/acpi_pcib_acpi.c Tue Dec 6 00:35:20 2016 (r309587) +++ head/sys/dev/acpica/acpi_pcib_acpi.c Tue Dec 6 00:36:02 2016 (r309588) @@ -488,10 +488,17 @@ acpi_pcib_acpi_attach(device_t dev) pci_domain_release_bus(sc->ap_segment, dev, rid, bus_res); } } else { -#ifdef INVARIANTS - if (first_decoded_bus(sc, &start) == 0) - KASSERT(start == sc->ap_bus, ("bus number mismatch")); -#endif + /* + * Require the bus number from _BBN to match the start of any + * decoded range. + */ + if (first_decoded_bus(sc, &start) == 0 && sc->ap_bus != start) { + device_printf(dev, + "bus number %d does not match start of decoded range %ju\n", + sc->ap_bus, (uintmax_t)start); + pcib_host_res_free(dev, &sc->ap_host_res); + return (ENXIO); + } } #else /* @@ -514,6 +521,9 @@ acpi_pcib_acpi_attach(device_t dev) if (device_add_child(dev, "pci", -1) == NULL) { device_printf(device_get_parent(dev), "couldn't attach pci bus\n"); +#if defined(NEW_PCIB) && defined(PCI_RES_BUS) + pcib_host_res_free(dev, &sc->ap_host_res); +#endif return (ENXIO); } return (bus_generic_attach(dev));
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