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Honor the prefetchable flag in memory BARs by setting the RF_PREFETCHABLE

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flag when calling bus_alloc_resource() to allocate resources from a parent
PCI bridge.  For PCI-PCI bridges this asks the bridge to satisfy the
request using the prefetchable memory range rather than the normal
memory range.

Reviewed by:	imp
Reported by:	scottl
MFC after:	1 week
This commit is contained in:
John Baldwin 2009-03-05 15:28:46 +00:00
parent 9f960e98aa
commit d004885d3a
1 changed files with 6 additions and 2 deletions
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8
sys/dev/pci/pci.c
View file

@ -2313,9 +2313,11 @@ pci_add_map(device_t pcib, device_t bus, device_t dev,
PCIB_WRITE_CONFIG(pcib, b, s, f, reg, map, 4);
PCIB_WRITE_CONFIG(pcib, b, s, f, PCIR_COMMAND, cmd, 2);
if (PCI_BAR_MEM(map))
if (PCI_BAR_MEM(map)) {
type = SYS_RES_MEMORY;
else
if (map & PCIM_BAR_MEM_PREFETCH)
prefetch = 1;
} else
type = SYS_RES_IOPORT;
ln2size = pci_mapsize(testval);
ln2range = pci_maprange(testval);
@ -3488,6 +3490,8 @@ pci_alloc_map(device_t dev, device_t child, int type, int *rid,
count = 1UL << mapsize;
if (RF_ALIGNMENT(flags) < mapsize)
flags = (flags & ~RF_ALIGNMENT_MASK) | RF_ALIGNMENT_LOG2(mapsize);
if (PCI_BAR_MEM(testval) && (testval & PCIM_BAR_MEM_PREFETCH))
flags |= RF_PREFETCHABLE;
/*
* Allocate enough resource, and then write back the