On Thu, 2015-10-08 at 14:38 -0700, Yinghai Lu wrote: > We still get "no compatible bridge window" warning on sparc T5-8 > after we add support for 64bit resource parsing for root bus. > > PCI: scan_bus[/pci@300/pci@1/pci@0/pci@6] bus no 8 > PCI: Claiming 0000:00:01.0: Resource 15: 0000800100000000..00008004afffffff [220c] > PCI: Claiming 0000:01:00.0: Resource 15: 0000800100000000..00008004afffffff [220c] > PCI: Claiming 0000:02:04.0: Resource 15: 0000800100000000..000080012fffffff [220c] > PCI: Claiming 0000:03:00.0: Resource 15: 0000800100000000..000080012fffffff [220c] > PCI: Claiming 0000:04:06.0: Resource 14: 0000800100000000..000080010fffffff [220c] > PCI: Claiming 0000:05:00.0: Resource 0: 0000800100000000..0000800100001fff [204] > pci 0000:05:00.0: can't claim BAR 0 [mem 0x800100000000-0x800100001fff]: no compatible bridge window > > All the bridges 64-bit resource have pref bit, but the device resource does not > have pref set, then we can not find parent for the device resource, > as we can not put non-pref mem under pref mem. > > According to pcie spec errta > https://www.pcisig.com/specifications/pciexpress/base2/PCIe_Base_r2.1_Errata_08Jun10.pdf > page 13, in some case it is ok to mark some as pref. > > Mark if the entire path from the host to the adapter is over PCI Express. > Then set pref compatible bit for claim/sizing/assign for 64bit mem resource > on that pcie device. > > -v2: set pref for mmio 64 when whole path is PCI Express, according to David Miller. > -v3: don't set pref directly, change to UNDER_PREF, and set PREF before > sizing and assign resource, and cleart PREF afterwards. requested by BenH. > -v4: use on_all_pcie_path device flag instead. > > Fixes: commit d63e2e1f3df9 ("sparc/PCI: Clip bridge windows to fit in upstream windows") > Link: http://lkml.kernel.org/r/CAE9FiQU1gJY1LYrxs+ma5LCTEEe4xmtjRG0aXJ9K_Tsu+m9Wuw@xxxxxxxxxxxxxx > Reported-by: David Ahern <david.ahern@xxxxxxxxxx> > Tested-by: David Ahern <david.ahern@xxxxxxxxxx> > Link: https://bugzilla.kernel.org/show_bug.cgi?id=81431 > Tested-by: TJ <linux@xxxxxx> > Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx> Tested on sparc platforms Tested-by: Khalid Aziz <khalid.aziz@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
