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-rw-r--r--drivers/iommu/arm-smmu-v3.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 80532d9ecaaf..159117e2c5ad 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -316,6 +316,7 @@
#define ARM64_TCR_TBI0_MASK 0x1UL
#define CTXDESC_CD_0_AA64 (1UL << 41)
+#define CTXDESC_CD_0_S (1UL << 44)
#define CTXDESC_CD_0_R (1UL << 45)
#define CTXDESC_CD_0_A (1UL << 46)
#define CTXDESC_CD_0_ASET_SHIFT 47
@@ -595,6 +596,7 @@ struct arm_smmu_device {
#define ARM_SMMU_FEAT_TRANS_S2 (1 << 10)
#define ARM_SMMU_FEAT_STALLS (1 << 11)
#define ARM_SMMU_FEAT_HYP (1 << 12)
+#define ARM_SMMU_FEAT_STALL_FORCE (1 << 13)
u32 features;
#define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0)
@@ -987,6 +989,11 @@ static void arm_smmu_write_ctx_desc(struct arm_smmu_device *smmu,
CTXDESC_CD_0_R | CTXDESC_CD_0_A | CTXDESC_CD_0_ASET_PRIVATE |
CTXDESC_CD_0_AA64 | (u64)cfg->cd.asid << CTXDESC_CD_0_ASID_SHIFT |
CTXDESC_CD_0_V;
+
+ /* STALL_MODEL==0b10 && CD.S==0 is ILLEGAL */
+ if (smmu->features & ARM_SMMU_FEAT_STALL_FORCE)
+ val |= CTXDESC_CD_0_S;
+
cfg->cdptr[0] = cpu_to_le64(val);
val = cfg->cd.ttbr & CTXDESC_CD_1_TTB0_MASK << CTXDESC_CD_1_TTB0_SHIFT;
@@ -1107,7 +1114,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
#endif
STRTAB_STE_1_STRW_NSEL1 << STRTAB_STE_1_STRW_SHIFT);
- if (smmu->features & ARM_SMMU_FEAT_STALLS)
+ if (smmu->features & ARM_SMMU_FEAT_STALLS &&
+ !(smmu->features & ARM_SMMU_FEAT_STALL_FORCE))
dst[1] |= cpu_to_le64(STRTAB_STE_1_S1STALLD);
val |= (ste->s1_cfg->cdptr_dma & STRTAB_STE_0_S1CTXPTR_MASK
@@ -2531,9 +2539,10 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
coherent ? "true" : "false");
switch (reg & IDR0_STALL_MODEL_MASK << IDR0_STALL_MODEL_SHIFT) {
- case IDR0_STALL_MODEL_STALL:
- /* Fallthrough */
case IDR0_STALL_MODEL_FORCE:
+ smmu->features |= ARM_SMMU_FEAT_STALL_FORCE;
+ /* Fallthrough */
+ case IDR0_STALL_MODEL_STALL:
smmu->features |= ARM_SMMU_FEAT_STALLS;
}