Re: Running Xen on Nvidia Jetson-TK1

[Julien Grall <julien.grall@arm.com>]

Hello Dushyant,

On 24/03/16 11:05, Dushyant Behl wrote:
> I was not receiving the dom0 logs because of a mistake in my dom0
> bootargs. In the bootargs the option
> for earlyprintk was not marked as Xen. Now that I've enabled it I'm
> able to see some bootlog from dom0 linux.
>
> At least now I'm able to figure out the reason of Linux running into
> infinite loop.
>
> It seems like Linux is not receiving any interrupts from the arch
> timer and when it tries
> to calibrate the timer delay then there's a loop where linux waits to
> receive ticks to calculate
> loops_per_jiffies and that's the point where dom0 is running into the
> infinite loop.
> (exact point is http://osxr.org:8080/linux/source/init/calibrate.c#0196)
>
> This is the dom0 bootlog which I received after correcting the
> earlyprintk argument -

Can you provide the full log? So we can see if there is anything which 
could give us a hint about your problem.

>
> (XEN) DOM0: Uncompressing Linux... done, booting the kernel.
> (XEN) DOM0: [    0.000000] Booting Linux on physical CPU 0x0
> (XEN) DOM0: [    0.000000] Initializing cgroup subsys cpu
> (XEN) DOM0: [    0.000000] Initializing cgroup subsys cpuacct
> (XEN) DOM0: [    0.000000] Linux version
> 4.1.0-196898-g2e68ed9-dirty(root@ubuntu-server) (gcc version 4.7.3
> (Ubuntu/Linaro 4.7.3-11ubuntu
> (XEN) DOM0: 1) ) #12 SMP PREEMPT Thu Mar 24 09:56:36 UTC 2016
> (XEN) DOM0: [    0.000000] CPU: ARMv7 Processor [413fc0f3] revision 3
> (ARMv7), cr=30c5387d
> (XEN) DOM0: [    0.000000] CPU: PIPT / VIPT nonaliasing data cache,
> PIPT instruction cache
> (XEN) DOM0: [    0.000000] Machine model: NVIDIA Tegra124 Jetson TK1
> (XEN) DOM0: [    0.000000] bootconsole [earlycon0] enabled
> (XEN) DOM0: [    0.000000] cma: Reserved 64 MiB at 0x00000000bc000000
> (XEN) DOM0: [    0.000000] Forcing write-allocate cache policy for SMP
> (XEN) DOM0: [    0.000000] Memory policy: Data cache writealloc
> (XEN) DOM0: [    0.000000] psci: probing for conduit method from DT.
> (XEN) DOM0: [    0.000000] psci: PSCIv0.2 detected in firmware.
> (XEN) DOM0: [    0.000000] psci: Using standard PSCI v0.2 function IDs
> (XEN) DOM0: [    0.000000] PERCPU: Embedded 12 pages/cpu @dbb77000
> s19712 r8192 d21248 u49152
> (XEN) DOM0: [    0.000000] Built 1 zonelists in Zone order, mobility
> grouping on.  Total pages: 130048
> (XEN) DOM0: [    0.000000] Kernel command line: console=hvc0
> console=tty1 earlyprintk=xen root=/dev/mmcblk0p1 rw rootwait
> tegraid=40.1.1.0.0
> (XEN) DOM0: [    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
> (XEN) DOM0: [    0.000000] Dentry cache hash table entries: 65536
> (order: 6, 262144 bytes)
> (XEN) DOM0: [    0.000000] Inode-cache hash table entries: 32768
> (order: 5, 131072 bytes)
> (XEN) DOM0: [    0.000000] Memory: 441884K/524288K available (7657K
> kernel code, 634K rwdata, 2584K rodata, 484K init, 383K bss, 16868K
> reserved, 65536K cma-reserved, 0K highmem)
> (XEN) DOM0: [    0.000000] Virtual kernel memory layout:
> (XEN) DOM0: [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
> (XEN) DOM0: [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
> (XEN) DOM0: [    0.000000]     vmalloc : 0xe0800000 - 0xff000000   ( 488 MB)
> (XEN) DOM0: [    0.000000]     lowmem  : 0xc0000000 - 0xe0000000   ( 512 MB)
> (XEN) DOM0: [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
> (XEN) DOM0: [    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
> (XEN) DOM0: [    0.000000]       .text : 0xc0008000 - 0xc0a08c10   (10244 kB)
> (XEN) DOM0: [    0.000000]       .init : 0xc0a09000 - 0xc0a82000   ( 484 kB)
> (XEN) DOM0: [    0.000000]       .data : 0xc0a82000 - 0xc0b20bec   ( 635 kB)
> (XEN) DOM0: [    0.000000]        .bss : 0xc0b23000 - 0xc0b82ea0   ( 384 kB)
> (XEN) DOM0: [    0.000000] Preemptible hierarchical RCU implementation.
> (XEN) DOM0: [    0.000000] Build-time adjustment of leaf fanout to 32.
> (XEN) DOM0: [    0.000000] NR_IRQS:16 nr_irqs:16 16
> (XEN) DOM0: [    0.000000] of_irq_init: children remain, but no parents
> (XEN) DOM0: [    0.000000] L2C: failed to init: -19
> (XEN) DOM0: [    0.000000] irq: no irq domain found for /interrupt-controller !
> (XEN) DOM0: [    0.000000] irq: no irq domain found for /interrupt-controller !
> (XEN) DOM0: [    0.000000] irq: no irq domain found for /interrupt-controller !
> (XEN) DOM0: [    0.000000] arch_timer: No interrupt available, giving up
> (XEN) DOM0: [    0.000000] sched_clock: 32 bits at 100 Hz, resolution
> 10000000ns, wraps every 21474836475000000ns
> (XEN) DOM0: [    0.000000] Console: colour dummy device 80x30
> (XEN) DOM0: [    0.000000] console [tty1] enabled
>
> Can anyone explain why Linux is not able to get any interrupts from
> the arch timer?
> Is this some problem with Xen's interrupt mappings or some issue with
> the dom0 kernel?

 From the log: "arch_timer: No interrupt available, giving up". So the 
kernel is not able to get the interrupt from device tree.
Which device-tree are you using for the board?

Regards,

-- 
Julien Grall

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