From 284f5f9dbac170b054c1e386ef92cbf654e91bba Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Mon, 30 Apr 2012 15:21:02 -0600 Subject: PCI: work around Stratus ftServer broken PCIe hierarchy A PCIe downstream port is a P2P bridge. Its secondary interface is a link that should lead only to device 0 (unless ARI is enabled)[1], so we don't probe for non-zero device numbers. Some Stratus ftServer systems have a PCIe downstream port (02:00.0) that leads to both an upstream port (03:00.0) and a downstream port (03:01.0), and 03:01.0 has important devices below it: [0000:02]-+-00.0-[03-3c]--+-00.0-[04-09]--... \-01.0-[0a-0d]--+-[USB] +-[NIC] +-... Previously, we didn't enumerate device 03:01.0, so USB and the network didn't work. This patch adds a DMI quirk to scan all device numbers, not just 0, below a downstream port. Based on a patch by Prarit Bhargava. [1] PCIe spec r3.0, sec 7.3.1 CC: Myron Stowe CC: Don Dutile CC: James Paradis CC: Matthew Wilcox CC: Jesse Barnes CC: Prarit Bhargava Signed-off-by: Bjorn Helgaas --- arch/x86/pci/common.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'arch/x86/pci/common.c') diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c index 323481e06ef..16c5d783529 100644 --- a/arch/x86/pci/common.c +++ b/arch/x86/pci/common.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -229,6 +230,14 @@ static int __devinit assign_all_busses(const struct dmi_system_id *d) } #endif +static int __devinit set_scan_all(const struct dmi_system_id *d) +{ + printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n", + d->ident); + pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS); + return 0; +} + static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = { #ifdef __i386__ /* @@ -420,6 +429,13 @@ static const struct dmi_system_id __devinitconst pciprobe_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"), }, }, + { + .callback = set_scan_all, + .ident = "Stratus/NEC ftServer", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ftServer"), + }, + }, {} }; -- cgit v1.2.3-70-g09d2