Pavel Roskin wrote:
On Tue, 2009-02-17 at 23:25 -0500, Pavel Roskin wrote:
Saw pci_bus_alloc_resource() allocated resource above 4G for a
non-Prefetchable Memory Space BAR on 64-bit machine. This is not correct
since the non-Prefetchable Memory Space and I/O Space are 32-bit width.
Only Prefetchable Memory Space support 64-bit address.
Sorry for follow-up.
If we are allow prefetchable memory windows for CardBus bridges to have
64-bit addresses, then we need to program the upper part of those
addresses in pci_setup_cardbus(). If it's impossible, then all CardBus
memory windows should be limited to 32-bit addresses.
Sorry I don't have the CardBus spec in my hands. Is the
PCI_CB_MEMORY_BASE_0/PCI_CB_MEMORY_LIMIT_0 lower part of a 64-bit BAR?
If it is, then we can enhance the pci_setup_cardbus() to program the
upper 32-bit. Otherwise, we could check the bridge type (header type 1
or 2) to decide if a prefetch BAR is 32-bit or 64-bit when allocating
resource for it.
Thanks,
Yu
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