<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Tue, Mar 13, 2018 at 2:36 PM, Ard Biesheuvel <span dir="ltr"><<a href="mailto:ard.biesheuvel@linaro.org" target="_blank">ard.biesheuvel@linaro.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 13 March 2018 at 12:26, Frederik Lotter<br>
<div><div class="h5"><<a href="mailto:frederik.lotter@netronome.com">frederik.lotter@netronome.com</a><wbr>> wrote:<br>
> Hi Ard,<br>
><br>
> On Mon, Mar 12, 2018 at 6:22 PM, Ard Biesheuvel <<a href="mailto:ard.biesheuvel@linaro.org">ard.biesheuvel@linaro.org</a>><br>
> wrote:<br>
>><br>
>> On 12 March 2018 at 16:15, Frederik Lotter<br>
>> <<a href="mailto:frederik.lotter@netronome.com">frederik.lotter@netronome.com</a><wbr>> wrote:<br>
>> > Hi,<br>
>> > I am getting CPU stall warnings when booting up using the EFI route. I<br>
>> > suspect the PCIe interface, as the stall warning sometimes contain the<br>
>> > probe<br>
>> > function. Other times is seems to get further than PCIe init, but still<br>
>> > stall interrupt handling.<br>
>> > Here are some facts around my observation:<br>
>> ><br>
>> > I have two sdcards for my Machiattobin board. They have identical<br>
>> > kernels<br>
>> > (4.16 rc5) with Ubuntu 16.04 rootfs. The one sdcard uses a uboot, DT and<br>
>> > kernel boot. The second sdcard has EDKII, grub kernel boot. The EDKII<br>
>> > build<br>
>> > includes the device tree DTB (and DTS which I believe is unused) from<br>
>> > the<br>
>> > one used on the uboot sdcard.<br>
>> ><br>
>> > EFI stub: Booting Linux Kernel...<br>
>> > EFI stub: Using DTB from configuration table<br>
>> > EFI stub: Exiting boot services and installing virtual address map...<br>
>> > [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd081]<br>
>> > [ 0.000000] Linux version 4.16.0-rc5-mbcin-netronome-2-<wbr>dirty<br>
>> > (root@mcb1-cpt) (gcc version 5.4.0 20160609 (Ubuntu/Linaro<br>
>> > 5.4.0-6ubuntu1~16.04.9)) #2 SMP PREEMPT Mon Mar 12 14:40:25 UTC 2018<br>
>> > [ 0.000000] Machine model: Marvell 8040 MACHIATOBin<br>
>> > [ 0.000000] efi: Getting EFI parameters from FDT:<br>
>> > [ 0.000000] efi: EFI v2.70 by EDK II<br>
>> > [ 0.000000] efi: SMBIOS 3.0=0xbfd00000 ACPI 2.0=0xb6760000<br>
>> > MEMATTR=0xb8973418 RNG=0xbffdbf98<br>
>> > [ 0.000000] random: fast init done<br>
>> > [ 0.000000] efi: seeding entropy pool<br>
>> > :<br>
>> ><br>
>> > (I am using the latest EDKII master, the Marvell edk2-open-platform<br>
>> > 17.10<br>
>> > banch, with all the latest mv-ddr/ atf /etc....).<br>
>> ><br>
>> > The DT data appear there in die EFI boot, but the PCIe interface fails,<br>
>> > and<br>
>> > results (I believe) in the CPU stall warnings:<br>
>> ><br>
>> > [ 717.453025] INFO: rcu_preempt self-detected stall on CPU<br>
>> > :<br>
>> > :<br>
>> > [ 717.589783] armada8k_pcie_probe+0x140/<wbr>0x240<br>
>> > :<br>
>> ><br>
>> > Other times, the pcie gets further:<br>
>> ><br>
>> > [ 3.312127] PCI: OF: host bridge /cp0/pcie@f2600000 ranges:<br>
>> > [ 3.317740] PCI: OF: IO 0xf9000000..0xf900ffff -> 0xf9000000<br>
>> > [ 3.323692] PCI: OF: MEM 0xc0000000..0xdfffffff -> 0xc0000000<br>
>> > [ 3.328915] random: crng init done<br>
>> > [ 4.326158] armada8k-pcie f2600000.pcie: phy link never came up<br>
>> > [ 4.332109] armada8k-pcie f2600000.pcie: Link not up after<br>
>> > reconfiguration<br>
>> > [ 4.339056] armada8k-pcie f2600000.pcie: PCI host bridge to bus<br>
>> > 0000:00<br>
>><br>
>><br>
>> To be brutally honest, the armada8k-pcie driver is a piece of junk,<br>
>> and you're much better off using the generic ECAM driver, which now<br>
>> includes special handling for the missing root port on Synopsys IP.<br>
>><br>
>> It also allows you to have both MMIO32 and MMIO64 regions, which can<br>
>> be useful with some PCIe cards with large BARs<br>
>><br>
>> Could you try<br>
>><br>
>> compatible = "marvell,armada8k-pcie-ecam";<br>
>><br>
>> in the DT node, please?<br>
>><br>
>> (Before you do that, please check whether UEFI recognizes your PCI<br>
>> hardware using the 'pci' command in the shell)<br>
><br>
><br>
> This exercise help a lot. Thank you for the proposal.<br>
><br>
> So now I can consistently boot using uboot and efi.<br>
><br>
> However, the pcie driver init fails. I have provided boot logs and also my<br>
> DT entry - we need custom BAR ranges, and I am not sure if this driver<br>
> understand everything.<br>
><br>
> cp0_pcie0: pcie@f2600000 {<br>
> compatible = "marvell,armada8k-pcie-ecam", "snps,dw-pcie";<br>
> reg = <0 0xf2600000 0 0x10000>,<br>
> <0 ((0xf6000000 + (0 * 0x1000000)) + 0xf00000) 0 0x80000>;<br>
> reg-names = "ctrl", "config";<br>
> #address-cells = <3>;<br>
> #size-cells = <2>;<br>
> #interrupt-cells = <1>;<br>
> device_type = "pci";<br>
> dma-coherent;<br>
> msi-parent = <&gic_v2m0>;<br>
><br>
> bus-range = <0 0xff>;<br>
> ranges =<br>
><br>
> <0x81000000 0 (0xf9000000 + (0 * 0x10000)) 0 (0xf9000000 + (0 * 0x10000))<br>
> 0 0x10000<br>
><br>
> 0x82000000 0 (0xf6000000 + (0 * 0x1000000)) 0 (0xf6000000 + (0 *<br>
> 0x1000000)) 0 0xf00000>;<br>
> interrupt-map-mask = <0 0 0 0>;<br>
> interrupt-map = <0 0 0 0 &cp0_icu 0x0 22 4>;<br>
> interrupts = <0x0 22 4>;<br>
> num-lanes = <1>;<br>
> clocks = <&cp0_clk 1 13>;<br>
> status = "disabled";<br>
> };<br>
><br>
><br>
> Error:<br>
><br>
> [ 1.396968] PCI: OF: host bridge /cp0/pcie@f2600000 ranges:<br>
> [ 1.396979] PCI: OF: IO 0xf9000000..0xf900ffff -> 0xf9000000<br>
> [ 1.396984] PCI: OF: MEM 0xc0000000..0xdfffffff -> 0xc0000000<br>
> [ 1.396998] pci-host-generic f2600000.pcie: ECAM area [mem<br>
> 0xf2600000-0xf260ffff] can only accommodate [bus 00-ffffffffffffffff]<br>
> (reduced from [bus 00-ff] desired)<br>
> [ 1.397002] pci-host-generic f2600000.pcie: ECAM ioremap failed<br>
> [ 1.397011] pci-host-generic: probe of f2600000.pcie failed with error<br>
> -12<br>
><br>
><br>
> Thanks for the support.<br>
><br>
<br>
</div></div>Please try the following config<br>
<br>
cp0_pcie0: pcie@e0000000 {<br>
<span class=""> compatible = "marvell,armada8k-pcie-ecam", "snps,dw-pcie";<br>
</span> reg = <0 0xe0000000 0 0xff00000>;<br>
<span class=""> #address-cells = <3>;<br>
#size-cells = <2>;<br>
#interrupt-cells = <1>;<br>
device_type = "pci";<br>
dma-coherent;<br>
msi-parent = <&gic_v2m0>;<br>
<br>
</span> bus-range = <0 0xfe>;<br>
ranges = <0x1000000 0x0 0x00000000 0x0 0xeff00000 0x0 0x00010000>,<br>
<0x2000000 0x0 0xc0000000 0x0 0xc0000000 0x0 0x20000000>,<br>
<0x3000000 0x8 0x00000000 0x8 0x00000000 0x1 0x00000000>;<br>
<span class=""><br>
interrupt-map-mask = <0 0 0 0>;<br>
interrupt-map = <0 0 0 0 &cp0_icu 0x0 22 4>;<br>
</span>};<br></blockquote><div><br></div><div>I am trying it now.</div><div><br></div><div>Could you just give me some insight on how the peripheral base address can be just modified like that ?</div><div><br></div><div>Is there a mapping change somewhere? </div></div><br></div></div>