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authorRalf Baechle <ralf@linux-mips.org>2006-12-20 00:12:08 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2006-12-20 21:54:43 +0300
commitfb0f2b40faff41f03acaa2ee6e6231fc96ca497c (patch)
tree10f2f69cb43d6440313bb3efdc53ca69334830c0 /include/linux/ioport.h
parent7e7a43c32a8970ea2bfc3d1af353dcb1a9237769 (diff)
downloadlinux-fb0f2b40faff41f03acaa2ee6e6231fc96ca497c.tar.xz
PCI legacy resource fix
Since commit 368c73d4f689dae0807d0a2aa74c61fd2b9b075f the kernel will try to update the non-writeable BAR registers 0..3 of PIIX4 IDE adapters if pci_assign_unassigned_resources() is used to do full resource assignment of the bus. This fails because in the PIIX4 these BAR registers have implicitly assumed values and read back as zero; it used to work because the kernel used to just write zero to that register the read back value did match what was written. The fix is a new resource flag IORESOURCE_PCI_FIXED used to mark a resource as non-movable. This will also be useful to keep other import system resources from being moved around - for example system consoles on PCI busses. [akpm@osdl.org: cleanup] Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/ioport.h')
-rw-r--r--include/linux/ioport.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index cf8696d4a138..15228d79c5bc 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -91,6 +91,9 @@ struct resource_list {
#define IORESOURCE_ROM_COPY (1<<2) /* ROM is alloc'd copy, resource field overlaid */
#define IORESOURCE_ROM_BIOS_COPY (1<<3) /* ROM is BIOS copy, resource field overlaid */
+/* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
+#define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
+
/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
extern struct resource ioport_resource;
extern struct resource iomem_resource;