On 29.01.2015 09:33, Hans Verkuil wrote:
On 01/11/2015 10:33 AM, Raimonds Cicans wrote:
I contacted you because I am hit by regression caused by your commit:
453afdd "[media] cx23885: convert to vb2"
My system:
AMD Athlon(tm) II X2 240e Processor on Asus M5A97 LE R2.0 motherboard
TBS6981 card (Dual DVB-S/S2 PCIe receiver, cx23885 in kernel driver)
After upgrade from kernel 3.13.10 (do not have commit) to 3.17.7
(have commit) I started receiving following IOMMU related messages:
1)
AMD-Vi: Event logged [IO_PAGE_FAULT device=0a:00.0 domain=0x001d
address=0x000000000637c000 flags=0x0000]
where device=0a:00.0 is TBS6981 card
As far as I can tell this has nothing to do with the cx23885 driver but is
a bug in the amd iommu/BIOS. See e.g.:
https://bbs.archlinux.org/viewtopic.php?pid=1309055
I managed to reproduce the Intel equivalent if I enable CONFIG_IOMMU_SUPPORT.
Most likely due to broken BIOS/ACPI/whatever information that's read by the
kernel. I would recommend disabling this kernel option.
Maybe...
But on other hand this did not happen on old kernel with old driver.
And when I did bisection on old kernel + media tree I started to
receive this message only on new driver.
And I can not disable this feature because then USB and LAN
stop working.
Ray
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