linux-stable.git/drivers/pci/probe.c, branch linux-3.5.y

PCI: Check P2P bridge for invalid secondary/subordinate range

2012-10-12T20:47:07+00:00

commit 1965f66e7db08d1ebccd24a59043eba826cc1ce8 upstream.

For bridges with "secondary > subordinate", i.e., invalid bus number
apertures, we don't enumerate anything behind the bridge unless the
user specified "pci=assign-busses".

This patch makes us automatically try to reassign the downstream bus
numbers in this case (just for that bridge, not for all bridges as
"pci=assign-busses" does).

We don't discover all the devices on the Intel DP43BF motherboard
without this change (or "pci=assign-busses") because its BIOS configures
a bridge as:

    pci 0000:00:1e.0: PCI bridge to [bus 20-08] (subtractive decode)

[bhelgaas: changelog, change message to dev_info]
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=18412
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=625754
Reported-by: Brian C. Huffman 
Reported-by: VL 
Tested-by: VL 
Signed-off-by: Yinghai Lu 
Signed-off-by: Bjorn Helgaas

Merge branch 'topic/stratus' into next

2012-05-07T15:23:27+00:00

PCI: work around Stratus ftServer broken PCIe hierarchy

2012-04-30T21:21:02+00:00

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

PCI: add host bridge release support

2012-04-30T20:52:43+00:00

We need a hook to release host bridge resources allocated when creating
root bus.

Signed-off-by: Yinghai Lu 
Signed-off-by: Bjorn Helgaas

PCI: add generic device into pci_host_bridge struct

2012-04-30T19:53:42+00:00

Use that device for pci_root_bus bridge pointer.

Use pci_release_bus_bridge_dev() to release allocated pci_host_bridge in
remove path.

Use root bus bridge pointer to get host bridge pointer instead of searching
host bridge list.  That leaves the host bridge list unused, so remove it.

Signed-off-by: Yinghai Lu 
Signed-off-by: Bjorn Helgaas

PCI: move host bridge-related code to host-bridge.c

2012-04-30T19:36:14+00:00

Move host bridge-related code from probe.c to a new host-bridge.c.

Signed-off-by: Yinghai Lu 
Signed-off-by: Bjorn Helgaas

PCI: fix bridge I/O window bus-to-resource conversion

2012-03-20T17:41:27+00:00

In 5bfa14ed9f3c, I forgot to initialize res2.flags before calling
pcibios_bus_to_resource(), which depends on the resource type to locate the
correct aperture.  This bug won't hurt x86, which currently never has an
offset between bus and CPU addresses, but will affect other architectures.

Signed-off-by: Bjorn Helgaas 
Signed-off-by: Jesse Barnes

PCI: Move "pci reassigndev resource alignment" out of quirks.c

2012-02-24T22:37:26+00:00

This isn't really a quirk; calling it directly from pci_add_device makes
more sense.

Signed-off-by: Yinghai Lu 
Signed-off-by: Jesse Barnes

PCI: collapse pcibios_resource_to_bus

2012-02-24T03:19:04+00:00

Everybody uses the generic pcibios_resource_to_bus() supplied by the core
now, so remove the ARCH_HAS_GENERIC_PCI_OFFSETS used during conversion.

Signed-off-by: Bjorn Helgaas

PCI: add generic pcibios_resource_to_bus()

2012-02-24T03:19:00+00:00

This replaces the generic versions of pcibios_resource_to_bus() and
pcibios_bus_to_resource() in asm-generic/pci.h with versions that use
pci_resource_to_bus() and pci_bus_to_resource().

The replacements are equivalent except that they can apply host
bridge window offsets when the arch has supplied them by using
pci_add_resource_offset().

Each arch can convert to using pci_add_resource_offset() individually by
removing its device resource fixups from pcibios_fixup_bus() and supplying
ARCH_HAS_GENERIC_PCI_OFFSETS.  ARCH_HAS_GENERIC_PCI_OFFSETS can be removed
after all have converted.

Signed-off-by: Bjorn Helgaas