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[PATCH] PCI: handle subtractive decode pci-pci bridge better

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With the number of PCI bus resources increased to 8, we can
handle the subtractive decode PCI-PCI bridge like a normal
bridge, taking into account standard PCI-PCI bridge windows
(resources 0-2). This helps to avoid problems with peer-to-peer DMA
behind such bridges, poor performance for MMIO ranges outside bridge
windows and prefetchable vs. non-prefetchable memory issues.

To reflect the fact that such bridges do forward all addresses to
the secondary bus (transparency), remaining bus resources 3-7 are
linked to resources 0-4 of the primary bus. These resources will be
used as fallback by resource management code if allocation from
standard bridge windows fails for some reason.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ivan Kokshaysky 2005-06-07 04:07:02 +04:00 committed by Greg Kroah-Hartman
parent a03fa95557
commit 90b54929b6
1 changed files with 2 additions and 3 deletions
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5
drivers/pci/probe.c
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@ -239,9 +239,8 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
if (dev->transparent) { if (dev->transparent) {
printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev)); printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
child->resource[i] = child->parent->resource[i]; child->resource[i] = child->parent->resource[i - 3];
return;
} }
for(i=0; i<3; i++) for(i=0; i<3; i++)