Hi Murali, On Mon, May 09, 2016 at 03:32:42PM -0400, Murali Karicheri wrote: > Bjorn, > > I am running into an issue with using a rtk8168 GiB NIC card with Keystone PCIe. > It works for 32bit BARs such as the Marvel SATA controller on K2E. On another > recent SoC (K2G) that re-uses the same driver and hardware, I have issues > bringing up PCIe. > > The rtk8168 NIC gets detected, but all read values are zeros. Based on the boot > log, it appears to be getting assigned 64bit BARs. See the log on K2E with Marvell > controller and that on K2G with rtk8168. Is there way we can get it assigned > 32Bit BAR and get it functional? Keystone is a 32bit ARM A15 SoC. > > Here are the logs. > > K2E log with Marvel controller (Good working case). > =================================================== > [ 0.236353] pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x600fffff] > [ 0.236364] pci 0000:00:00.0: BAR 9: assigned [mem 0x60100000-0x601fffff pref] > [ 0.236373] pci 0000:00:00.0: BAR 7: assigned [io 0x1000-0x1fff] > [ 0.236385] pci 0000:01:00.0: BAR 6: assigned [mem 0x60100000-0x6010ffff pref] > [ 0.236394] pci 0000:01:00.0: BAR 5: assigned [mem 0x60000000-0x600001ff] > [ 0.236406] pci 0000:01:00.0: BAR 4: assigned [io 0x1000-0x100f] > [ 0.236418] pci 0000:01:00.0: BAR 0: assigned [io 0x1010-0x1017] > [ 0.236429] pci 0000:01:00.0: BAR 2: assigned [io 0x1018-0x101f] > [ 0.236441] pci 0000:01:00.0: BAR 1: assigned [io 0x1020-0x1023] > [ 0.236452] pci 0000:01:00.0: BAR 3: assigned [io 0x1024-0x1027] > [ 0.236464] pci 0000:00:00.0: PCI bridge to [bus 01] > [ 0.236472] pci 0000:00:00.0: bridge window [io 0x1000-0x1fff] > [ 0.236481] pci 0000:00:00.0: bridge window [mem 0x60000000-0x600fffff] > [ 0.236490] pci 0000:00:00.0: bridge window [mem 0x60100000-0x601fffff pref] > > K2G log with Tealtek NIC card > ============================= > [ 2.311572] keystone-pcie 21801000.pcie: PCI host bridge to bus 0000:00 > [ 2.318188] pci_bus 0000:00: root bus resource [bus 00-ff] > [ 2.323844] pci_bus 0000:00: root bus resource [io 0x0000-0x3fff] > [ 2.330023] pci_bus 0000:00: root bus resource [mem 0x50000000-0x5fffffff] There's no "(bus address ...)" annotation here, which means these windows map CPU addresses to identical bus addresses. The "[mem 0x50000000-0x5fffffff]" window is a 32-bit window. > [ 2.337567] PCI: bus0: Fast back to back transfers disabled > [ 2.361159] PCI: bus1: Fast back to back transfers disabled > [ 2.366889] pci 0000:00:00.0: BAR 8: assigned [mem 0x50000000-0x500fffff] > [ 2.373841] pci 0000:00:00.0: BAR 9: assigned [mem 0x50100000-0x501fffff pref] > [ 2.381061] pci 0000:00:00.0: BAR 7: assigned [io 0x1000-0x1fff] > [ 2.387225] pci 0000:01:00.0: BAR 6: assigned [mem 0x50100000-0x5011ffff pref] > [ 2.394505] pci 0000:01:00.0: BAR 4: assigned [mem 0x50120000-0x5012ffff 64bit pref] > [ 2.402288] pci 0000:01:00.0: BAR 2: assigned [mem 0x50000000-0x50000fff 64bit] I assume these BARs (2 and 4) are the ones in question. They are 64-bit BARs, but the addresses currently assigned to them fit in 32 bits, so the space is already all below 4GB. The BAR type (32-bit or 64-bit) is built into the device; Linux doesn't have any influence on that. The type is encoded in the low-order four bits of the BAR, which are read-only. > [ 2.409610] pci 0000:01:00.0: BAR 0: assigned [io 0x1000-0x10ff] > [ 2.415729] pci 0000:00:00.0: PCI bridge to [bus 01] > [ 2.420693] pci 0000:00:00.0: bridge window [io 0x1000-0x1fff] > [ 2.426806] pci 0000:00:00.0: bridge window [mem 0x50000000-0x500fffff] > [ 2.433610] pci 0000:00:00.0: bridge window [mem 0x50100000-0x501fffff pref] > [ 2.441365] pcieport 0000:00:00.0: Signaling PME through PCIe PME interrupt > [ 2.448323] pci 0000:01:00.0: Signaling PME through PCIe PME interrupt > [ 2.455567] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded > [ 2.461332] r8169 0000:01:00.0: enabling device (0140 -> 0143) > [ 2.468789] r8169 0000:01:00.0 eth0: RTL8169 at 0xf0d6a000, 00:00:00:00:00:00, XID 00000000 IRQ 286 Looks like this is printed by rtl_init_one(). I see that we read zeroes from MAC0 and TxConfig, but I don't see any PCI problem here. Could it be that some EEPROM on the card hasn't been programmed yet? Does the card work if you put it in a different machine? > [ 2.478169] r8169 0000:01:00.0 eth0: jumbo features [frames: 7152 bytes, tx checksumming: ok] -- 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
