[PATCH] 2.5.14: New PCI allocation code (alpha, arm, parisc) [1/2]

This changes PCI resource allocation algorithm to 3 passes vs.
current 2 passes. Extra pass is used for calculation of required
size and alignment of PCI buses behind PCI-PCI bridges. After
that, in the pass #3, these buses get allocated like regular
PCI devices. This gives tighter PCI IO and memory packing -
for instance, this fixes allocation problems on certain alphas
with very small (112Mb) PCI memory range. Also, the new code
- will allow mixed approach to resource allocation:
  architecture can keep BIOS settings for some devices,
  and re-allocate resources for others, including improperly
  initialized bridges;
- makes prefetchable ranges support much simpler;
- allows sizing of IO and memory ranges for the host
  bridges, which might be very useful in some situations.

It was tested on various alphas; I haven't heard any complaints
from rmk and rth, so probably all of this is ok. :-)

Part 1:
- for all archs, 4th argument (align) added to
  pcibios_align_resource (and its callers).
  It's necessary because this function will be called for
  bus resources as well, and in this case size != alignment.
- for several archs, dead/bogus code removed from
  pcibios_fixup_pbus_ranges().

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 44007acbf3ed..65a5a3bcfcdb 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -500,7 +500,8 @@ int pcibios_enable_device(struct pci_dev *);
 char *pcibios_setup (char *str);
 
 /* Used only when drivers/pci/setup.c is used */
-void pcibios_align_resource(void *, struct resource *, unsigned long);
+void pcibios_align_resource(void *, struct resource *,
+			    unsigned long, unsigned long);
 void pcibios_update_resource(struct pci_dev *, struct resource *,
 			     struct resource *, int);
 void pcibios_update_irq(struct pci_dev *, int irq);