redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

iommu/arm-smmu: Don't BUG() if we find aborting STEs with disable_bypass

Browse source 
The disable_bypass cmdline option changes the SMMUv3 driver to put down
faulting stream table entries by default, as opposed to bypassing
transactions from unconfigured devices.

In this mode of operation, it is entirely expected to see aborting
entries in the stream table if and when we come to installing a valid
translation, so don't trigger a BUG() as a result of misdiagnosing these
entries as stream table corruption.

Cc: <stable@vger.kernel.org>
Fixes: 48ec83bcbc ("iommu/arm-smmu: Add initial driver support for ARM SMMUv3 devices")
Tested-by: Robin Murphy <robin.murphy@arm.com>
Reported-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2016-08-16 14:29:16 +01:00
parent 3714ce1d66
commit 5bc0a11664
1 changed files with 3 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/iommu/arm-smmu-v3.c
View file

@ -1034,6 +1034,9 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
case STRTAB_STE_0_CFG_S2_TRANS:
ste_live = true;
break;
case STRTAB_STE_0_CFG_ABORT:
if (disable_bypass)
break;
default:
BUG(); /* STE corruption */
}