iommu/arm-smmu-v3: Avoid memory corruption from Hisilicon MSI payloads

[ Upstream commit 84a9a75774961612d0c7dd34a1777e8f98a65abd ]

The GITS_TRANSLATER MMIO doorbell register in the ITS hardware is
architected to be 4 bytes in size, yet on hi1620 and earlier, Hisilicon
have allocated the adjacent 4 bytes to carry some IMPDEF sideband
information which results in an 8-byte MSI payload being delivered when
signalling an interrupt:

MSIAddr:
	 |----4bytes----|----4bytes----|
	 |    MSIData   |    IMPDEF    |

This poses no problem for the ITS hardware because the adjacent 4 bytes
are reserved in the memory map. However, when delivering MSIs to memory,
as we do in the SMMUv3 driver for signalling the completion of a SYNC
command, the extended payload will corrupt the 4 bytes adjacent to the
"sync_count" member in struct arm_smmu_device. Fortunately, the current
layout allocates these bytes to padding, but this is fragile and we
should make this explicit.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
[will: Rewrote commit message and comment]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 3e02aace38b104f8f98e7d370bbf7e73b54b6a86..4afb9cb99ea31bb52ca3157c1871ec199ed49a68 100644 (file)
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -586,7 +586,11 @@ struct arm_smmu_device {
 
        struct arm_smmu_strtab_cfg      strtab_cfg;
 
-       u32                             sync_count;
+       /* Hi16xx adds an extra 32 bits of goodness to its MSI payload */
+       union {
+               u32                     sync_count;
+               u64                     padding;
+       };
 
        /* IOMMU core code handle */
        struct iommu_device             iommu;