CVS commit: src/sys/dev/pci

["Jared D. McNeill" <jmcneill%netbsd.org@localhost>]

Module Name:    src
Committed By:   jmcneill
Date:           Sun Nov 12 13:56:20 UTC 2023

Modified Files:
        src/sys/dev/pci: pci_resource.c

Log Message:
pci: Improve resource allocation for non-prefetchable BARs.

When allocating resources for PCI devices, use the following criteria:
 - Prefetchable memory must be allocated from the prefetchable range
   of the parent bridge.
 - For 64-bit MMIO, try the prefetchable range first, and fallback to
   the non-prefetchable range. The idea here is to preserve 32-bit resources
   for 32-bit BARs.
 - For 32-bit MMIO, try the non-prefetchable range first. If that fails,
   make one last attempt at allocating from the prefetchable range, in the
   event that it has resources below 4GB.


To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/sys/dev/pci/pci_resource.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.