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 9208881a571c..5469f4fca820 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2510,6 +2510,25 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
 	return ret;
 }
 
+static size_t arm_smmu_split_block(struct iommu_domain *domain,
+				   unsigned long iova, size_t size)
+{
+	struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu;
+	struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;
+
+	if (!(smmu->features & (ARM_SMMU_FEAT_BBML1 | ARM_SMMU_FEAT_BBML2))) {
+		dev_err(smmu->dev, "don't support BBML1/2 and split block\n");
+		return 0;
+	}
+
+	if (!ops || !ops->split_block) {
+		pr_err("don't support split block\n");
+		return 0;
+	}
+
+	return ops->split_block(ops, iova, size);
+}
+
 static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 {
 	return iommu_fwspec_add_ids(dev, args->args, 1);
@@ -2609,6 +2628,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.device_group		= arm_smmu_device_group,
 	.domain_get_attr	= arm_smmu_domain_get_attr,
 	.domain_set_attr	= arm_smmu_domain_set_attr,
+	.split_block		= arm_smmu_split_block,
 	.of_xlate		= arm_smmu_of_xlate,
 	.get_resv_regions	= arm_smmu_get_resv_regions,
 	.put_resv_regions	= generic_iommu_put_resv_regions,
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index e299a44808ae..f3b7f7115e38 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -79,6 +79,8 @@
 #define ARM_LPAE_PTE_SH_IS		(((arm_lpae_iopte)3) << 8)
 #define ARM_LPAE_PTE_NS			(((arm_lpae_iopte)1) << 5)
 #define ARM_LPAE_PTE_VALID		(((arm_lpae_iopte)1) << 0)
+/* Block descriptor bits */
+#define ARM_LPAE_PTE_NT			(((arm_lpae_iopte)1) << 16)
 
 #define ARM_LPAE_PTE_ATTR_LO_MASK	(((arm_lpae_iopte)0x3ff) << 2)
 /* Ignore the contiguous bit for block splitting */
@@ -679,6 +681,125 @@ static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
 	return iopte_to_paddr(pte, data) | iova;
 }
 
+static size_t __arm_lpae_split_block(struct arm_lpae_io_pgtable *data,
+				     unsigned long iova, size_t size, int lvl,
+				     arm_lpae_iopte *ptep);
+
+static size_t arm_lpae_do_split_blk(struct arm_lpae_io_pgtable *data,
+				    unsigned long iova, size_t size,
+				    arm_lpae_iopte blk_pte, int lvl,
+				    arm_lpae_iopte *ptep)
+{
+	struct io_pgtable_cfg *cfg = &data->iop.cfg;
+	arm_lpae_iopte pte, *tablep;
+	phys_addr_t blk_paddr;
+	size_t tablesz = ARM_LPAE_GRANULE(data);
+	size_t split_sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
+	int i;
+
+	if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
+		return 0;
+
+	tablep = __arm_lpae_alloc_pages(tablesz, GFP_ATOMIC, cfg);
+	if (!tablep)
+		return 0;
+
+	blk_paddr = iopte_to_paddr(blk_pte, data);
+	pte = iopte_prot(blk_pte);
+	for (i = 0; i < tablesz / sizeof(pte); i++, blk_paddr += split_sz)
+		__arm_lpae_init_pte(data, blk_paddr, pte, lvl, &tablep[i]);
+
+	if (cfg->bbml == 1) {
+		/* Race does not exist */
+		blk_pte |= ARM_LPAE_PTE_NT;
+		__arm_lpae_set_pte(ptep, blk_pte, cfg);
+		io_pgtable_tlb_flush_walk(&data->iop, iova, size, size);
+	}
+	/* Race does not exist */
+	pte = arm_lpae_install_table(tablep, ptep, blk_pte, cfg);
+
+	/* Have splited it into page? */
+	if (lvl == (ARM_LPAE_MAX_LEVELS - 1))
+		return size;
+
+	/* Go back to lvl - 1 */
+	ptep -= ARM_LPAE_LVL_IDX(iova, lvl - 1, data);
+	return __arm_lpae_split_block(data, iova, size, lvl - 1, ptep);
+}
+
+static size_t __arm_lpae_split_block(struct arm_lpae_io_pgtable *data,
+				     unsigned long iova, size_t size, int lvl,
+				     arm_lpae_iopte *ptep)
+{
+	arm_lpae_iopte pte;
+	struct io_pgtable *iop = &data->iop;
+	size_t base, next_size, total_size;
+
+	if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
+		return 0;
+
+	ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
+	pte = READ_ONCE(*ptep);
+	if (WARN_ON(!pte))
+		return 0;
+
+	if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
+		if (iopte_leaf(pte, lvl, iop->fmt)) {
+			if (lvl == (ARM_LPAE_MAX_LEVELS - 1) ||
+			    (pte & ARM_LPAE_PTE_AP_RDONLY))
+				return size;
+
+			/* We find a writable block, split it. */
+			return arm_lpae_do_split_blk(data, iova, size, pte,
+					lvl + 1, ptep);
+		} else {
+			/* If it is the last table level, then nothing to do */
+			if (lvl == (ARM_LPAE_MAX_LEVELS - 2))
+				return size;
+
+			total_size = 0;
+			next_size = ARM_LPAE_BLOCK_SIZE(lvl + 1, data);
+			ptep = iopte_deref(pte, data);
+			for (base = 0; base < size; base += next_size)
+				total_size += __arm_lpae_split_block(data,
+						iova + base, next_size, lvl + 1,
+						ptep);
+			return total_size;
+		}
+	} else if (iopte_leaf(pte, lvl, iop->fmt)) {
+		WARN(1, "Can't split behind a block.\n");
+		return 0;
+	}
+
+	/* Keep on walkin */
+	ptep = iopte_deref(pte, data);
+	return __arm_lpae_split_block(data, iova, size, lvl + 1, ptep);
+}
+
+static size_t arm_lpae_split_block(struct io_pgtable_ops *ops,
+				   unsigned long iova, size_t size)
+{
+	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+	arm_lpae_iopte *ptep = data->pgd;
+	struct io_pgtable_cfg *cfg = &data->iop.cfg;
+	int lvl = data->start_level;
+	long iaext = (s64)iova >> cfg->ias;
+
+	if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size))
+		return 0;
+
+	if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
+		iaext = ~iaext;
+	if (WARN_ON(iaext))
+		return 0;
+
+	/* If it is smallest granule, then nothing to do */
+	if (size == ARM_LPAE_BLOCK_SIZE(ARM_LPAE_MAX_LEVELS - 1, data))
+		return size;
+
+	return __arm_lpae_split_block(data, iova, size, lvl, ptep);
+}
+
 static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
 {
 	unsigned long granule, page_sizes;
@@ -757,6 +878,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
 		.map		= arm_lpae_map,
 		.unmap		= arm_lpae_unmap,
 		.iova_to_phys	= arm_lpae_iova_to_phys,
+		.split_block	= arm_lpae_split_block,
 	};
 
 	return data;
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ffeebda8d6de..7dc0850448c3 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2707,6 +2707,46 @@ int iommu_domain_set_attr(struct iommu_domain *domain,
 }
 EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
 
+size_t iommu_split_block(struct iommu_domain *domain, unsigned long iova,
+			 size_t size)
+{
+	const struct iommu_ops *ops = domain->ops;
+	unsigned int min_pagesz;
+	size_t pgsize, splited_size;
+	size_t splited = 0;
+
+	min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
+
+	if (!IS_ALIGNED(iova | size, min_pagesz)) {
+		pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
+		       iova, size, min_pagesz);
+		return 0;
+	}
+
+	if (!ops || !ops->split_block) {
+		pr_err("don't support split block\n");
+		return 0;
+	}
+
+	while (size) {
+		pgsize = iommu_pgsize(domain, iova, size);
+
+		splited_size = ops->split_block(domain, iova, pgsize);
+
+		pr_debug("splited: iova 0x%lx size 0x%zx\n", iova, splited_size);
+		iova += splited_size;
+		size -= splited_size;
+		splited += splited_size;
+
+		if (splited_size != pgsize)
+			break;
+	}
+	iommu_flush_iotlb_all(domain);
+
+	return splited;
+}
+EXPORT_SYMBOL_GPL(iommu_split_block);
+
 void iommu_get_resv_regions(struct device *dev, struct list_head *list)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index 26583beeb5d9..b87c6f4ecaa2 100644
--- a/include/linux/io-pgtable.h
+++ b/include/linux/io-pgtable.h
@@ -162,6 +162,8 @@ struct io_pgtable_ops {
 			size_t size, struct iommu_iotlb_gather *gather);
 	phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
 				    unsigned long iova);
+	size_t (*split_block)(struct io_pgtable_ops *ops, unsigned long iova,
+			      size_t size);
 };
 
 /**
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index b3f0e2018c62..abeb811098a5 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -258,6 +258,8 @@ struct iommu_ops {
 			       enum iommu_attr attr, void *data);
 	int (*domain_set_attr)(struct iommu_domain *domain,
 			       enum iommu_attr attr, void *data);
+	size_t (*split_block)(struct iommu_domain *domain, unsigned long iova,
+			      size_t size);
 
 	/* Request/Free a list of reserved regions for a device */
 	void (*get_resv_regions)(struct device *dev, struct list_head *list);
@@ -509,6 +511,8 @@ extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 				 void *data);
 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 				 void *data);
+extern size_t iommu_split_block(struct iommu_domain *domain, unsigned long iova,
+				size_t size);
 
 /* Window handling function prototypes */
 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
@@ -903,6 +907,12 @@ static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 	return -EINVAL;
 }
 
+static inline size_t iommu_split_block(struct iommu_domain *domain,
+				       unsigned long iova, size_t size)
+{
+	return 0;
+}
+
 static inline int  iommu_device_register(struct iommu_device *iommu)
 {
 	return -ENODEV;
