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| author | Bjorn Helgaas <bhelgaas@google.com> | 2012-04-30 15:21:02 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-04-30 15:21:02 -0600 |
| commit | 284f5f9dbac170b054c1e386ef92cbf654e91bba (patch) | |
| tree | 74cacc94070d5590378c368fa7378d37319d07be /arch/x86/pci | |
| parent | 66f75a5d028beaf67c931435fdc3e7823125730c (diff) | |
| download | linux-284f5f9dbac170b054c1e386ef92cbf654e91bba.tar.bz2 | |
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 <mstowe@redhat.com>
CC: Don Dutile <ddutile@redhat.com>
CC: James Paradis <james.paradis@stratus.com>
CC: Matthew Wilcox <matthew.r.wilcox@intel.com>
CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'arch/x86/pci')
| -rw-r--r-- | arch/x86/pci/common.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c index 323481e06ef8..16c5d7835295 100644 --- a/arch/x86/pci/common.c +++ b/arch/x86/pci/common.c @@ -11,6 +11,7 @@ #include <linux/dmi.h> #include <linux/slab.h> +#include <asm-generic/pci-bridge.h> #include <asm/acpi.h> #include <asm/segment.h> #include <asm/io.h> @@ -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"), + }, + }, {} }; |