Is it possible that, this NIC card's DMA is only 32-bit capable (can be
confirmed from lspci -vv output) and since SMMU is disabled, allocated
memory's physical address happen to fall beyond 0xFFFF_FFFF region, so,
>32-bits are stripped off by DMA controller of NIC, resulting in
accesses to random addresses?
On Wednesday 30 November 2016 11:44 PM, Thierry Reding wrote:
* PGP Signed by an unknown key
On Wed, Nov 30, 2016 at 08:06:45PM +0200, Mikko Perttunen wrote:
On 11/30/2016 07:48 PM, Thierry Reding wrote:
On Mon, Nov 28, 2016 at 06:54:44PM +0200, Mikko Perttunen wrote:
Testing this series with a Jetson TX1 + r8168e PCI-E card, it /almost/
works.. Relevant parts of bootlog:
[ 1.876191] tegra-pcie 1003000.pcie-controller: 4x1, 1x1 configuration
[ 1.884200] tegra-pcie 1003000.pcie-controller: probing port 0, using 4
lanes
[ 1.893368] tegra-pcie 1003000.pcie-controller: Slot present pin change,
signature: 00000008
[ 1.948049] tegra-pcie 1003000.pcie-controller: probing port 1, using 1
lanes
[ 1.957209] tegra-pcie 1003000.pcie-controller: Slot present pin change,
signature: 00000000
[ 2.367748] tegra-pcie 1003000.pcie-controller: link 1 down, retrying
[ 2.778307] tegra-pcie 1003000.pcie-controller: link 1 down, retrying
[ 3.188888] tegra-pcie 1003000.pcie-controller: link 1 down, retrying
[ 3.197344] tegra-pcie 1003000.pcie-controller: link 1 down, ignoring
[ 3.203931] tegra-pcie 1003000.pcie-controller: PCI host bridge to bus
0000:00
[ 3.211160] pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
[ 3.217343] pci_bus 0000:00: root bus resource [mem
0x13000000-0x1fffffff]
[ 3.224218] pci_bus 0000:00: root bus resource [mem 0x20000000-0x3fffffff
pref]
[ 3.231525] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 3.237380] pci 0000:00:01.0: bridge configuration invalid ([bus 00-00]),
reconfiguring
[ 3.254499] pci 0000:00:01.0: BAR 14: assigned [mem
0x13000000-0x130fffff]
[ 3.261389] pci 0000:00:01.0: BAR 15: assigned [mem 0x20000000-0x200fffff
64bit pref]
[ 3.269220] pci 0000:00:01.0: BAR 13: assigned [io 0x1000-0x1fff]
[ 3.275412] pci 0000:01:00.0: BAR 4: assigned [mem 0x20000000-0x20003fff
64bit pref]
[ 3.283172] pci 0000:01:00.0: BAR 2: assigned [mem 0x13000000-0x13000fff
64bit]
[ 3.290498] pci 0000:01:00.0: BAR 0: assigned [io 0x1000-0x10ff]
[ 3.296596] pci 0000:00:01.0: PCI bridge to [bus 01]
[ 3.301568] pci 0000:00:01.0: bridge window [io 0x1000-0x1fff]
[ 3.307666] pci 0000:00:01.0: bridge window [mem 0x13000000-0x130fffff]
[ 3.314454] pci 0000:00:01.0: bridge window [mem 0x20000000-0x200fffff
64bit pref]
[ 3.322213] pci 0000:00:01.0: nv_msi_ht_cap_quirk didn't locate host
bridge
[ 3.329257] pcieport 0000:00:01.0: enabling device (0000 -> 0003)
[ 3.335572] pcieport 0000:00:01.0: Signaling PME through PCIe PME
interrupt
[ 3.342537] pci 0000:01:00.0: Signaling PME through PCIe PME interrupt
[ 3.349256] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[ 3.354858] r8169 0000:01:00.0: enabling device (0000 -> 0003)
[ 3.361460] r8169 0000:01:00.0 eth0: RTL8168e/8111e at
0xffff000008eae000, 98:de:d0:04:25:14, XID 0c200000 IRQ 348
[ 3.371812] r8169 0000:01:00.0 eth0: jumbo features [frames: 9200 bytes,
tx checksumming: ko]
then
[ 3.706240] tegra-mc 70019000.memory-controller: afiw: write
@0x000000007a484000: EMEM address decode error (EMEM decode error)
[ 3.717747] r8169 0000:01:00.0 eth0: link down
Hmm... that's very odd. It seems like for some reason the PCIe
controller wants to access memory that's below the DRAM. Do you happen
to have the SMMU enabled for PCIe? Can you try adding some debug prints
to the networking driver to find out where this address is coming from?
SMMU is disabled; I'll try adding debug prints. The behavior certainly looks
pretty strange.
Maybe you can also find out if at any point in the above the driver is
actually accessing the I/O ports. I don't think we've ever tested that
particular part very much.
I seem to be using a very similar card to yours, which makes it all the
more surprising that it isn't working for you.
Thierry
* Unknown Key
* 0x7F3EB3A1
--
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
