Hi Marian,
On 2016-08-03 08:40, Marian Mihailescu wrote:
http://paste.debian.net/786704
> [ 19.053848] exynos-sysmmu 11200000.sysmmu:: PAGE FAULT occurred at
0x51000000 (page table base: 0x6eb04000)
> [ 19.053854] exynos-sysmmu 11200000.sysmmu:: Lv1 entry: 0x6e81b001
> [ 19.053909] ------------[ cut here ]------------
> [ 19.053915] kernel BUG at drivers/iommu/exynos-iommu.c:410!
> [ 19.053920] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
> [ 19.053951] Modules linked in: s5p_mfc exynos_gsc v4l2_mem2mem
v4l2_common videobuf2_dma_contig videobuf2_memops videobuf2_v4l2
videodev videobuf2_core
> [ 19.053959] CPU: 0 PID: 336 Comm: setfont Not tainted 4.7.0-1 #2
> [ 19.053963] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 19.053968] task: c24e1900 ti: e3838000 task.ti: e3838000
> [ 19.053980] PC is at exynos_sysmmu_irq+0x1f4/0x210
> [ 19.053985] LR is at exynos_sysmmu_irq+0x100/0x210
> [ 19.053990] pc : [<c03eaa38>] lr : [<c03ea944>] psr: 600e0193
> [ 19.053990] sp : e3839a50 ip : ee870f80 fp : 00000510
> [ 19.053994] r10: 00000000 r9 : 0000001c r8 : ee86adb0
> [ 19.053998] r7 : ee86ad90 r6 : 51000000 r5 : 00000000 r4 : c074a838
> [ 19.054003] r3 : 6e81b001 r2 : 00000000 r1 : 6e81b001 r0 : 00000036
> [ 19.054009] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM
Segment none
> [ 19.054013] Control: 10c5387d Table: 6d9a806a DAC: 00000051
> [ 19.054017] Process setfont (pid: 336, stack limit = 0xe3838210)
the same config, but without EXYNOS_IOMMU boots fine.
This is a known issue - a page fault from MFC driver, which needs
special handling
of IOMMU. It exists since adding DT support to Exynos IOMMU driver in
v4.2 (earlier
Exynos IOMMU wasn't even initialized due to lack of DT support). This is
one of the
reasons, why Exynos IOMMU is not enabled yet in exynos_defconfig.
Proper support for IOMMU in MFC driver will be available in v4.8-rc1
(patches are
already queued for merging).
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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