[PATCH v5 9/9] iommu/arm-smmu-v3: Support the DS expansion of RIL's SCALE

[Jason Gunthorpe]

If DS is supported then SCALE can go up to 39. Compute a scale max that is
compatible for the entire invs list.

Reviewed-by: Nicolin Chen <nicolinc at nvidia.com>
Tested-by: Nicolin Chen <nicolinc at nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 15 ++++++++++++---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  2 ++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index b99229a5bbacca..2a159be751891e 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1060,9 +1060,16 @@ static void arm_smmu_invs_update_caps(struct arm_smmu_invs *invs,
 		invs->has_ats = true;
 
 	if (inv->smmu->features & ARM_SMMU_FEAT_RANGE_INV) {
+		unsigned int scale_max;
+
 		invs->has_range_inv = true;
 		if (inv->smmu->options & ARM_SMMU_OPT_FULL_CONT_RIL)
 			invs->has_full_cont_ril = true;
+
+		scale_max = (inv->smmu->features & ARM_SMMU_FEAT_DS) ? 39 : 31;
+		if (!invs->range_inv_scale_max ||
+		    scale_max < invs->range_inv_scale_max)
+			invs->range_inv_scale_max = scale_max;
 	}
 }
 
@@ -2625,7 +2632,8 @@ static unsigned int arm_smmu_compute_ttl(u8 leaf_bitmap, u8 table_bitmap,
  * covered by one command.
  */
 static void arm_smmu_tlbi_calc_range(struct arm_smmu_tlbi *tlbi,
-				     bool single_ril)
+				     bool single_ril,
+				     unsigned int scale_max)
 {
 	u8 tgsz_lg2 = tlbi->tgsz_lg2;
 	unsigned int ttl = arm_smmu_compute_ttl(
@@ -2647,7 +2655,7 @@ static void arm_smmu_tlbi_calc_range(struct arm_smmu_tlbi *tlbi,
 	 * address beyond alignment to tg (so long as TTL=0).
 	 */
 	first.scale = fls64((num_tg - 1) / 32);
-	if (first.scale > 31) {
+	if (first.scale > scale_max) {
 		/* Range too large for a single command do full invalidation */
 		tlbi->range.use_full_inv = true;
 		return;
@@ -2917,7 +2925,8 @@ void arm_smmu_domain_tlbi(struct arm_smmu_tlbi *tlbi,
 			arm_smmu_tlbi_calc_range(
 				tlbi,
 				smmu_domain->stage == ARM_SMMU_DOMAIN_SVA &&
-					invs->has_full_cont_ril);
+					invs->has_full_cont_ril,
+				invs->range_inv_scale_max);
 		}
 	}
 
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 6582203eb7425f..8b251a188810c9 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -760,6 +760,7 @@ static inline bool arm_smmu_inv_is_ats(const struct arm_smmu_inv *inv)
  * @has_ats: flag if the array contains an INV_TYPE_ATS or INV_TYPE_ATS_FULL
  * @has_range_inv: flag if any entry's SMMU supports range invalidation
  * @has_full_cont_ril: flag if any entry's SMMU requires the CONT RIL workaround
+ * @range_inv_scale_max: max SCALE usable by all range-capable SMMUs
  * @rcu: rcu head for kfree_rcu()
  * @inv: flexible invalidation array
  *
@@ -791,6 +792,7 @@ struct arm_smmu_invs {
 	bool has_ats;
 	bool has_range_inv;
 	bool has_full_cont_ril;
+	u8 range_inv_scale_max;
 	struct rcu_head rcu;
 	struct arm_smmu_inv inv[] __counted_by(max_invs);
 };
-- 
2.43.0