Merge tag 'iommu-fixes-v6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - Arm SMMU fixes from Will Deacon:
     - Fix TLB range command encoding when TTL, Num and Scale are all zero
     - Fix soft lockup by limiting TLB invalidation ops issued by SVA
     - Fix clocks description for SDM630 platform in arm-smmu DT binding

 - Intel VT-d fix from Lu Baolu:
     - Fix a suspend/hibernation problem in iommu_suspend()

 - Mediatek driver: Fix page table sharing for addresses over 4GiB

 - Apple/Dart: DMA_FQ handling fix in attach_dev()

* tag 'iommu-fixes-v6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Avoid memory allocation in iommu_suspend()
  iommu/apple-dart: Handle DMA_FQ domains in attach_dev()
  iommu/mediatek: Fix share pgtable for iova over 4GB
  iommu/arm-smmu-v3: Fix soft lockup triggered by arm_smmu_mm_invalidate_range
  dt-bindings: arm-smmu: Fix SDM630 clocks description
  iommu/arm-smmu-v3: Avoid constructing invalid range commands

Author: torvalds

Documentation/devicetree/bindings/iommu/arm,smmu.yaml

@@ -270,6 +270,7 @@ allOf:
           contains:
             enum:
               - qcom,msm8998-smmu-v2
+              - qcom,sdm630-smmu-v2
     then:
       anyOf:
         - properties:
@@ -311,7 +312,6 @@ allOf:
         compatible:
           contains:
             enum:
-              - qcom,sdm630-smmu-v2
               - qcom,sm6375-smmu-v2
     then:
       anyOf:

drivers/iommu/apple-dart.c

@@ -671,8 +671,7 @@ static int apple_dart_attach_dev(struct iommu_domain *domain,
 		return ret;
 
 	switch (domain->type) {
-	case IOMMU_DOMAIN_DMA:
-	case IOMMU_DOMAIN_UNMANAGED:
+	default:
 		ret = apple_dart_domain_add_streams(dart_domain, cfg);
 		if (ret)
 			return ret;

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c

@@ -186,6 +186,15 @@ static void arm_smmu_free_shared_cd(struct arm_smmu_ctx_desc *cd)
 	}
 }
 
+/*
+ * Cloned from the MAX_TLBI_OPS in arch/arm64/include/asm/tlbflush.h, this
+ * is used as a threshold to replace per-page TLBI commands to issue in the
+ * command queue with an address-space TLBI command, when SMMU w/o a range
+ * invalidation feature handles too many per-page TLBI commands, which will
+ * otherwise result in a soft lockup.
+ */
+#define CMDQ_MAX_TLBI_OPS		(1 << (PAGE_SHIFT - 3))
+
 static void arm_smmu_mm_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
 						struct mm_struct *mm,
 						unsigned long start,
@@ -201,8 +210,13 @@ static void arm_smmu_mm_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
 	 * range. So do a simple translation here by calculating size correctly.
 	 */
 	size = end - start;
-	if (size == ULONG_MAX)
-		size = 0;
+	if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_RANGE_INV)) {
+		if (size >= CMDQ_MAX_TLBI_OPS * PAGE_SIZE)
+			size = 0;
+	} else {
+		if (size == ULONG_MAX)
+			size = 0;
+	}
 
 	if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_BTM)) {
 		if (!size)

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

@@ -1895,18 +1895,23 @@ static void __arm_smmu_tlb_inv_range(struct arm_smmu_cmdq_ent *cmd,
 		/* Get the leaf page size */
 		tg = __ffs(smmu_domain->domain.pgsize_bitmap);
 
+		num_pages = size >> tg;
+
 		/* Convert page size of 12,14,16 (log2) to 1,2,3 */
 		cmd->tlbi.tg = (tg - 10) / 2;
 
 		/*
-		 * Determine what level the granule is at. For non-leaf, io-pgtable
-		 * assumes .tlb_flush_walk can invalidate multiple levels at once,
-		 * so ignore the nominal last-level granule and leave TTL=0.
+		 * Determine what level the granule is at. For non-leaf, both
+		 * io-pgtable and SVA pass a nominal last-level granule because
+		 * they don't know what level(s) actually apply, so ignore that
+		 * and leave TTL=0. However for various errata reasons we still
+		 * want to use a range command, so avoid the SVA corner case
+		 * where both scale and num could be 0 as well.
 		 */
 		if (cmd->tlbi.leaf)
 			cmd->tlbi.ttl = 4 - ((ilog2(granule) - 3) / (tg - 3));
-
-		num_pages = size >> tg;
+		else if ((num_pages & CMDQ_TLBI_RANGE_NUM_MAX) == 1)
+			num_pages++;
 	}
 
 	cmds.num = 0;

drivers/iommu/intel/iommu.c

@@ -2998,13 +2998,6 @@ static int iommu_suspend(void)
 	struct intel_iommu *iommu = NULL;
 	unsigned long flag;
 
-	for_each_active_iommu(iommu, drhd) {
-		iommu->iommu_state = kcalloc(MAX_SR_DMAR_REGS, sizeof(u32),
-					     GFP_KERNEL);
-		if (!iommu->iommu_state)
-			goto nomem;
-	}
-
 	iommu_flush_all();
 
 	for_each_active_iommu(iommu, drhd) {
@@ -3024,12 +3017,6 @@ static int iommu_suspend(void)
 		raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
 	}
 	return 0;
-
-nomem:
-	for_each_active_iommu(iommu, drhd)
-		kfree(iommu->iommu_state);
-
-	return -ENOMEM;
 }
 
 static void iommu_resume(void)
@@ -3061,9 +3048,6 @@ static void iommu_resume(void)
 
 		raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
 	}
-
-	for_each_active_iommu(iommu, drhd)
-		kfree(iommu->iommu_state);
 }
 
 static struct syscore_ops iommu_syscore_ops = {

drivers/iommu/intel/iommu.h

@@ -681,7 +681,7 @@ struct intel_iommu {
 	struct iopf_queue *iopf_queue;
 	unsigned char iopfq_name[16];
 	struct q_inval  *qi;            /* Queued invalidation info */
-	u32 *iommu_state; /* Store iommu states between suspend and resume.*/
+	u32 iommu_state[MAX_SR_DMAR_REGS]; /* Store iommu states between suspend and resume.*/
 
 #ifdef CONFIG_IRQ_REMAP
 	struct ir_table *ir_table;	/* Interrupt remapping info */

drivers/iommu/mtk_iommu.c

@@ -262,7 +262,7 @@ struct mtk_iommu_data {
 	struct device			*smicomm_dev;
 
 	struct mtk_iommu_bank_data	*bank;
-	struct mtk_iommu_domain		*share_dom; /* For 2 HWs share pgtable */
+	struct mtk_iommu_domain		*share_dom;
 
 	struct regmap			*pericfg;
 	struct mutex			mutex; /* Protect m4u_group/m4u_dom above */
@@ -643,8 +643,8 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
 	struct mtk_iommu_domain	*share_dom = data->share_dom;
 	const struct mtk_iommu_iova_region *region;
 
-	/* Always use share domain in sharing pgtable case */
-	if (MTK_IOMMU_HAS_FLAG(data->plat_data, SHARE_PGTABLE) && share_dom) {
+	/* Share pgtable when 2 MM IOMMU share the pgtable or one IOMMU use multiple iova ranges */
+	if (share_dom) {
 		dom->iop = share_dom->iop;
 		dom->cfg = share_dom->cfg;
 		dom->domain.pgsize_bitmap = share_dom->cfg.pgsize_bitmap;
@@ -677,8 +677,7 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
 	/* Update our support page sizes bitmap */
 	dom->domain.pgsize_bitmap = dom->cfg.pgsize_bitmap;
 
-	if (MTK_IOMMU_HAS_FLAG(data->plat_data, SHARE_PGTABLE))
-		data->share_dom = dom;
+	data->share_dom = dom;
 
 update_iova_region:
 	/* Update the iova region for this domain */