Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> writes: > On Sat, 12 Dec 2020 at 08:11, Kalle Valo <kvalo@xxxxxxxxxxxxxx> wrote: >> >> Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> writes: >> >> > Hello, >> > >> > I've noticed the following backtrace during shutdown stage when >> > rebooting RB5 board, >> > using linux-next/master: >> > >> > [ 31.060483] ath11k_pci 0000:01:00.0: shutdown >> > [ 31.067844] ------------[ cut here ]------------ >> > [ 31.073111] WARNING: CPU: 4 PID: 101 at >> > drivers/iommu/io-pgtable-arm.c:583 __arm_lpae_unmap+0x39c/0x550 >> >> Do you have CONFIG_DMA_API_DEBUG disabled? There is one commit fixing a >> DMA API debug warning but that should be in linux-next already: >> >> cd6181ff7e93 ath11k: dp_rx: fix monitor status dma unmap direction > > I have enabled CONFIG_DMA_API_DEBUG (and _SG too). Got no additional > traces during boot and the same trace during reboot. On x86 I see this during rmmod when iommu is enabled: [ +0.012066] DMAR: DRHD: handling fault status reg 2 [ +0.000022] DMAR: [DMA Write] Request device [06:00.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set [ +0.014657] DMAR: DRHD: handling fault status reg 2 [ +0.000017] DMAR: [DMA Write] Request device [06:00.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set Is that the similar issue you are seeing, but just the printouts are different due to different iommu implementation? -- https://patchwork.kernel.org/project/linux-wireless/list/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
