Re: [Xen-devel] ThunderX support in Xen
On Tue, 6 Mar 2018, Stefano Stabellini wrote:
> On Wed, 31 Jan 2018, Julien Grall wrote:
> > When working on getting Xen booting on rochester{0,1} (Thunder-X in
> > Osstest),
> > I blacklist them with this small patch. I will clean-up it and send it on
> > the ML:
> >
> > diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> > index 155c952349..8b7fb0e12a 100644
> > --- a/xen/arch/arm/domain_build.c
> > +++ b/xen/arch/arm/domain_build.c
> > @@ -1182,6 +1182,7 @@ static int handle_node(struct domain *d, struct
> > kernel_info *kinfo,
> > DT_MATCH_TYPE("memory"),
> > /* The memory mapped timer is not supported by Xen. */
> > DT_MATCH_COMPATIBLE("arm,armv7-timer-mem"),
> > +DT_MATCH_COMPATIBLE("cavium,smmu-v2"),
> > { /* sentinel */ },
> > };
> > static const struct dt_device_match timer_matches[] __initconst =
> >
> > The only other issues I found was when booting using Grub. I needed to bump
> > the
> > number of banks.
>
> Hi Julien,
>
> thanks to your ThunderX patch series, I could go forward in the boot
> sequence, however the initrd still cannot mount the rootfs. The device
> doesn't come up, there is this warning:
>
> [ 11.451711] WARNING: CPU: 32 PID: 802 at
> /build/linux-hwe-z0PmXZ/linux-hwe-4.10.0/drivers/ata/libata-core.c:6468
> ata_host_activate+0x140/0x158
> [ 11.451712] Modules linked in: drm(+) ahci(+) libahci thunder_bgx(+)
> thunder_xcv mdio_thunder(+) mdio_cavium
> [ 11.451725]
> [ 11.451730] CPU: 32 PID: 802 Comm: systemd-udevd Tainted: GW
> 4.10.0-38-generic #42~16.04.1-Ubuntu
> [ 11.451732] Hardware name: cavium,thunder-88xx (DT)
> [ 11.451734] task: 8000efa4ab80 task.stack: 8000efa7c000
> [ 11.451739] PC is at ata_host_activate+0x140/0x158
> [ 11.451744] LR is at ata_host_activate+0x68/0x158
>
> See the appended full logs. I am wondering if you have seen this issue,
> I thought I would ask before attempting to debug it. Also, is vanilla
> Linux expected to work on ThunderX?
Silly me, everything works as expected once I enabled CONFIG_HAS_ITS.
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Re: [Xen-devel] ThunderX support in Xen
Hi Stefano,
On 31/01/18 00:01, Stefano Stabellini wrote:
> I am testing Xen support in ThunderX, but I am having some issues
> booting Dom0 using Xen staging and the Ubuntu Xenial kernel (it has
> CONFIG_XEN enabled). The trace is appened to this email. I am using the
> device tree converted from /proc/device-tree on the running system
> without Xen.
Why do you need to convert the DT from /proc/device-tree? You should just
rely on the one provided by the firmware directly.
> [3.273098] Unable to handle kernel NULL pointer dereference at virtual
> address 0080
> [3.281254] pgd = 0946d000
> [3.284721] [0080] *pgd=bfffe003, *pud=bfffd003,
> *pmd=
> [3.293059] Internal error: Oops: 9604 [#1] SMP
> [3.298001] Modules linked in:
> [3.301127] CPU: 81 PID: 1 Comm: swapper/0 Not tainted 4.10.0-38-generic
> #42~16.04.1-Ubuntu
> [3.309564] Hardware name: cavium,thunder-88xx (DT)
> [3.314492] task: 80007c573a00 task.stack: 80007c578000
> [3.320485] PC is at arm_smmu_device_cfg_probe+0x300/0x770
> [3.326039] LR is at arm_smmu_device_cfg_probe+0x25c/0x770
SMMU should not be assigned to the hardware domain. Cavium has a specific
compatible for their SMMUs which is not in Xen yet.
There was an attempt to add the compatible in Xen (see [1] which I didn't
ack because the SMMU changes for Cavium were not added.
Until the SMMU driver properly support Cavium's SMMU, we should blacklist
them.
When working on getting Xen booting on rochester{0,1} (Thunder-X in Osstest),
I blacklist them with this small patch. I will clean-up it and send it on the
ML:
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 155c952349..8b7fb0e12a 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1182,6 +1182,7 @@ static int handle_node(struct domain *d, struct
kernel_info *kinfo,
DT_MATCH_TYPE("memory"),
/* The memory mapped timer is not supported by Xen. */
DT_MATCH_COMPATIBLE("arm,armv7-timer-mem"),
+DT_MATCH_COMPATIBLE("cavium,smmu-v2"),
{ /* sentinel */ },
};
static const struct dt_device_match timer_matches[] __initconst =
The only other issues I found was when booting using Grub. I needed to bump the
number of banks.
By the way, if you haven't done it. I would highly recommend to upgrade to the
latest
firmware.
Cheers,
[1] https://lists.xen.org/archives/html/xen-devel/2017-06/msg02293.html
--
Julien Grall
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