[PATCH v2] iommu/arm-smmu-v3: Fix soft lockup triggered by arm_smmu_mm_invalidate_range

[Will Deacon]

On Tue, 19 Sep 2023 22:22:57 -0700, Nicolin Chen wrote:
> When running an SVA case, the following soft lockup is triggered:
> --------------------------------------------------------------------
> watchdog: BUG: soft lockup - CPU#244 stuck for 26s!
> pstate: 83400009 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
> pc : arm_smmu_cmdq_issue_cmdlist+0x178/0xa50
> lr : arm_smmu_cmdq_issue_cmdlist+0x150/0xa50
> sp : ffff8000d83ef290
> x29: ffff8000d83ef290 x28: 000000003b9aca00 x27: 0000000000000000
> x26: ffff8000d83ef3c0 x25: da86c0812194a0e8 x24: 0000000000000000
> x23: 0000000000000040 x22: ffff8000d83ef340 x21: ffff0000c63980c0
> x20: 0000000000000001 x19: ffff0000c6398080 x18: 0000000000000000
> x17: 0000000000000000 x16: 0000000000000000 x15: ffff3000b4a3bbb0
> x14: ffff3000b4a30888 x13: ffff3000b4a3cf60 x12: 0000000000000000
> x11: 0000000000000000 x10: 0000000000000000 x9 : ffffc08120e4d6bc
> x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000048cfa
> x5 : 0000000000000000 x4 : 0000000000000001 x3 : 000000000000000a
> x2 : 0000000080000000 x1 : 0000000000000000 x0 : 0000000000000001
> Call trace:
>  arm_smmu_cmdq_issue_cmdlist+0x178/0xa50
>  __arm_smmu_tlb_inv_range+0x118/0x254
>  arm_smmu_tlb_inv_range_asid+0x6c/0x130
>  arm_smmu_mm_invalidate_range+0xa0/0xa4
>  __mmu_notifier_invalidate_range_end+0x88/0x120
>  unmap_vmas+0x194/0x1e0
>  unmap_region+0xb4/0x144
>  do_mas_align_munmap+0x290/0x490
>  do_mas_munmap+0xbc/0x124
>  __vm_munmap+0xa8/0x19c
>  __arm64_sys_munmap+0x28/0x50
>  invoke_syscall+0x78/0x11c
>  el0_svc_common.constprop.0+0x58/0x1c0
>  do_el0_svc+0x34/0x60
>  el0_svc+0x2c/0xd4
>  el0t_64_sync_handler+0x114/0x140
>  el0t_64_sync+0x1a4/0x1a8
> --------------------------------------------------------------------
> 
> [...]

Applied to will (for-joerg/arm-smmu/fixes), thanks!

[1/1] iommu/arm-smmu-v3: Fix soft lockup triggered by arm_smmu_mm_invalidate_range
      https://git.kernel.org/will/c/d5afb4b47e13

Cheers,
-- 
Will

https://fixes.arm64.dev
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