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authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2009-02-17 13:46:53 +0300
committerJesse Barnes <jbarnes@hobbes.lan>2009-03-19 19:29:36 -0700
commit10a0ef39fbd1d484c2bbc1ffd83d57ecef209140 (patch)
tree2659f907c2039e0730d69fb8dac6e6f8e5b3cd34 /drivers/video
parentea7415512a07add2b09c070c9a5d1950833cf9b3 (diff)
PCI/alpha: pci sysfs resources
This closes http://bugzilla.kernel.org/show_bug.cgi?id=10893 which is a showstopper for X development on alpha. The generic HAVE_PCI_MMAP code (drivers/pci-sysfs.c) is not very useful since we have to deal with three different types of MMIO address spaces: sparse and dense mappings for old ev4/ev5 machines and "normal" 1:1 MMIO space (bwx) for ev56 and later. Also "write combine" mappings are meaningless on alpha - roughly speaking, alpha does write combining, IO reordering and other optimizations by default, unless user splits IO accesses with memory barriers. I think the cleanest way to deal with resource files on alpha is to convert the default no-op pci_create_resource_files() and pci_remove_resource_files() for !HAVE_PCI_MMAP case into __weak functions and override them with alpha specific ones. Another alpha hook is needed for "legacy_" resource files to handle sparse addressing (pci_adjust_legacy_attr). With the "standard" resourceN files on ev56/ev6 libpciaccess works "out of the box". Handling of resourceN_sparse/resourceN_dense files on older machines obviously requires some userland work. Sparse/dense stuff has been tested on sx164 (pca56/pyxis, normally uses bwx IO) with the kernel hacked into "cia compatible" mode. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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