Bug 96231

Summary: sparc64 can't handle BAR above 4GB
Product: Drivers Reporter: Bjorn Helgaas (bjorn)
Component: PCIAssignee: drivers_pci (drivers_pci)
Severity: normal CC: yinghai
Priority: P1    
Hardware: All   
OS: Linux   
URL: http://lkml.kernel.org/r/CAE9FiQU1gJY1LYrxs+ma5LCTEEe4xmtjRG0aXJ9K_Tsu+m9Wuw@mail.gmail.com
Kernel Version: v4.0-rc1 Tree: Mainline
Regression: Yes
Attachments: dmesg log (failing)

Description Bjorn Helgaas 2015-04-07 02:19:13 UTC
Created attachment 173261 [details]
dmesg log (failing)

David Ahern reported that v4.0-rc1 doesn't boot on sparc/T5-8.  See attached dmesg log.

  pci 0000:06:00.0: reg 0x184: can't handle BAR above 4GB (bus address 0x110204000)
  pci 0000:06:00.0: reg 0x190: can't handle BAR above 4GB (bus address 0x110304000)
Comment 1 Bjorn Helgaas 2015-05-16 15:17:13 UTC
David Ahern bisected this to d63e2e1f3df9 ("sparc/PCI: Clip bridge windows to fit in upstream windows").

We reverted that with d10b730f97a7 ("Revert "sparc/PCI: Clip bridge windows to fit in upstream windows""), which appeared in v4.0, so this should be fixed.

We'd still like to include the original d63e2e1f3df9 functionality, to make this more consistent across architectures, but we need to fix the problems on sparc first.