From: Ivan Kokshaysky Date: Tue, 7 Jun 2005 00:07:02 +0000 (+0400) Subject: [PATCH] PCI: handle subtractive decode pci-pci bridge better X-Git-Tag: v2.6.13-rc2~8^2~7 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=90b54929b626c80056262d9d99b3f48522e404d0;p=pandora-kernel.git [PATCH] PCI: handle subtractive decode pci-pci bridge better 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 Acked-by: Dominik Brodowski Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed