Thanks for the reply, Marek. Can you give me a repository where I can find the commits? I want to try them on my kernel tree. Regards, Marian On Wed, Aug 3, 2016 at 5:01 PM, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote: > 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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