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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 /drivers/pci/setup-res.c
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 'drivers/pci/setup-res.c')
-rw-r--r--drivers/pci/setup-res.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index ab78e4bbdd83..cb4ced3560e9 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -33,11 +33,22 @@ pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
u32 new, check, mask;
int reg;
- /* Ignore resources for unimplemented BARs and unused resource slots
- for 64 bit BARs. */
+ /*
+ * Ignore resources for unimplemented BARs and unused resource slots
+ * for 64 bit BARs.
+ */
if (!res->flags)
return;
+ /*
+ * Ignore non-moveable resources. This might be legacy resources for
+ * which no functional BAR register exists or another important
+ * system resource we should better not move around in system address
+ * space.
+ */
+ if (res->flags & IORESOURCE_PCI_FIXED)
+ return;
+
pcibios_resource_to_bus(dev, &region, res);
pr_debug(" got res [%llx:%llx] bus [%lx:%lx] flags %lx for "
@@ -212,6 +223,10 @@ pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
resource_size_t r_align;
r = &dev->resource[i];
+
+ if (r->flags & IORESOURCE_PCI_FIXED)
+ continue;
+
r_align = r->end - r->start;
if (!(r->flags) || r->parent)