diff options
| -rw-r--r-- | drivers/iommu/arm-smmu-v3.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 6947ccf26512..71eda422c926 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -828,7 +828,13 @@ static int arm_smmu_cmdq_build_cmd(u64 *cmd, struct arm_smmu_cmdq_ent *ent) cmd[0] |= FIELD_PREP(CMDQ_SYNC_0_CS, CMDQ_SYNC_0_CS_SEV); cmd[0] |= FIELD_PREP(CMDQ_SYNC_0_MSH, ARM_SMMU_SH_ISH); cmd[0] |= FIELD_PREP(CMDQ_SYNC_0_MSIATTR, ARM_SMMU_MEMATTR_OIWB); - cmd[0] |= FIELD_PREP(CMDQ_SYNC_0_MSIDATA, ent->sync.msidata); + /* + * Commands are written little-endian, but we want the SMMU to + * receive MSIData, and thus write it back to memory, in CPU + * byte order, so big-endian needs an extra byteswap here. + */ + cmd[0] |= FIELD_PREP(CMDQ_SYNC_0_MSIDATA, + cpu_to_le32(ent->sync.msidata)); cmd[1] |= ent->sync.msiaddr & CMDQ_SYNC_1_MSIADDR_MASK; break; default: |