On Mon, Apr 27, 2009 at 3:24 PM, Bjorn Helgaas <bjorn.helgaas@xxxxxx> wrote: > On Monday 27 April 2009 03:00:16 pm Yinghai Lu wrote: >> On Mon, Apr 27, 2009 at 1:39 PM, Bjorn Helgaas <bjorn.helgaas@xxxxxx> wrote: >> >> other system may have broken _CRS. >> > >> > Do you have examples of problems here, or are you just worried that >> > there *may* be problems? >> one system with three chains... with pci=use_crs >> [ 9.365669] pci_bus 0000:00: resource 0 io: [0x00-0x3af] >> [ 9.371065] pci_bus 0000:00: resource 1 io: [0x3e0-0xcf7] >> [ 9.376551] pci_bus 0000:00: resource 2 io: [0x3b0-0x3bb] >> [ 9.382028] pci_bus 0000:00: resource 3 io: [0x3c0-0x3df] >> [ 9.387513] pci_bus 0000:00: resource 4 io: [0xd00-0xefff] >> [ 9.393077] pci_bus 0000:00: resource 5 mem: [0x0a0000-0x0bffff] >> [ 9.399084] pci_bus 0000:00: resource 6 mem: [0x0d0000-0x0dffff] >> [ 9.405089] pci_bus 0000:00: resource 7 mem: [0xdd000000-0xdfffffff] >> [ 9.505332] pci_bus 0000:40: resource 0 io: [0x5000-0x8fff] >> [ 9.510991] pci_bus 0000:40: resource 1 mem: [0xdb000000-0xdcffffff] >> [ 9.553378] pci_bus 0000:80: resource 0 io: [0x1000-0x4fff] >> [ 9.559036] pci_bus 0000:80: resource 1 mem: [0xda000000-0xdaffffff] >> >> without that: amd_bus.c will read that from pci conf space >> [ 9.310965] pci_bus 0000:00: resource 0 io: [0x9000-0xefff] >> [ 9.316621] pci_bus 0000:00: resource 1 io: [0x00-0xfff] >> [ 9.322020] pci_bus 0000:00: resource 2 mem: [0xdd000000-0xdfffffff] >> [ 9.328373] pci_bus 0000:00: resource 3 mem: [0x0a0000-0x0bffff] >> [ 9.334378] pci_bus 0000:00: resource 4 mem: [0xc0000000-0xd9ffffff] >> [ 9.340731] pci_bus 0000:00: resource 5 mem: [0xf0000000-0xffffffff] >> [ 9.347084] pci_bus 0000:00: resource 6 mem: [0x840000000-0xfcffffffff] >> [ 9.444440] pci_bus 0000:40: resource 0 io: [0x5000-0x8fff] >> [ 9.450099] pci_bus 0000:40: resource 1 io: [0xf000-0xffff] >> [ 9.455757] pci_bus 0000:40: resource 2 mem: [0xdb000000-0xdcffffff] >> [ 9.498118] pci_bus 0000:80: resource 0 io: [0x1000-0x4fff] >> [ 9.503777] pci_bus 0000:80: resource 1 mem: [0xda000000-0xdaffffff] > > It's interesting that many of the differences involve the legacy > VGA I/O ports in the 0x3b0-0x3df range. My guess is that the AMD > chipset has special routing for those ranges. If it didn't, it > would be difficult to support VGA devices under the other two > root bridges. Maybe that VGA routing doesn't show up in the > bridge's PCI config space. Can you tell from the ASL whether the > root bridge _SRS/_PRS/_CRS methods handle the VGA ranges specially? > > One of the differences is that PCI config space shows a 64-bit region > (bus 0000:00 mem 0x840000000-0xfcffffffff) that doesn't show up in > the _CRS info. But the _CRS parsing depends on acpi_resource_to_address64(), > which doesn't know about the ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64 > descriptors added in ACPI 3.0. So this difference could be a result > of that Linux bug. It'd be interesting to see whether the test patch > below makes a difference. will check it. > > The PCI config space region 0xf0000000-0xffffffff, also on bus 0000:00, > looks suspicious to me. I thought that area contained a bunch of > BIOS-y things like reset vectors and local APICs. in the amd_bus.c, will put left over resource to def HT chain. YH -- 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
