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PCI: work around Stratus ftServer broken PCIe hierarchy

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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>
This commit is contained in:
Bjorn Helgaas 2012-04-30 15:21:02 -06:00
parent 66f75a5d02
commit 284f5f9dba
5 changed files with 34 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/asm-generic/pci-bridge.h
View file

@ -30,6 +30,12 @@ enum {
PCI_ENABLE_PROC_DOMAINS = 0x00000010,
/* ... except for domain 0 */
PCI_COMPAT_DOMAIN_0 = 0x00000020,
/* PCIe downstream ports are bridges that normally lead to only a
* device 0, but if this is set, we scan all possible devices, not
* just device 0.
*/
PCI_SCAN_ALL_PCIE_DEVS = 0x00000040,
};
#ifdef CONFIG_PCI