iommu/arm-smmu-qcom: Fix mask extraction for bootloader programmed SMRs

commit dead723e6f049e9fb6b05e5b93456982798ea961 upstream.

When extracting the mask for a SMR that was programmed by the
bootloader, the SMR's valid bit is also extracted and is treated
as part of the mask, which is not correct. Consider the scenario
where an SMMU master whose context is determined by a bootloader
programmed SMR is removed (omitting parts of device/driver core):

->iommu_release_device()
 -> arm_smmu_release_device()
  -> arm_smmu_master_free_smes()
   -> arm_smmu_free_sme() /* Assume that the SME is now free */
   -> arm_smmu_write_sme()
    -> arm_smmu_write_smr() /* Construct SMR value using mask and SID */

Since the valid bit was considered as part of the mask, the SMR will
be programmed as valid.

Fix the SMR mask extraction step for bootloader programmed SMRs
by masking out the valid bit when we know that we're already
working with a valid SMR.

Fixes: 07a7f2caaa5a ("iommu/arm-smmu-qcom: Read back stream mappings")
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Cc: stable@vger.kernel.org
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/1611611545-19055-1-git-send-email-isaacm@codeaurora.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 0eba5e883e3f1d1313884d8fb27e43d20a9fe8c4..63f7173b241f0e804562f616272957146f9082cb 100644 (file)
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -65,6 +65,8 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
                smr = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_SMR(i));
 
                if (FIELD_GET(ARM_SMMU_SMR_VALID, smr)) {
+                       /* Ignore valid bit for SMR mask extraction. */
+                       smr &= ~ARM_SMMU_SMR_VALID;
                        smmu->smrs[i].id = FIELD_GET(ARM_SMMU_SMR_ID, smr);
                        smmu->smrs[i].mask = FIELD_GET(ARM_SMMU_SMR_MASK, smr);
                        smmu->smrs[i].valid = true;