Re: [RESEND PATCH v2 2/3] iommu/io-pgtable-arm: Add support for AARCH64 split pagetables

[Jordan Crouse <jcrouse@codeaurora.org>]

On Wed, Jul 10, 2019 at 05:45:37PM +0100, Robin Murphy wrote:
> Hi Jordan,
> 
> On 08/07/2019 20:00, Jordan Crouse wrote:
> >Add a new sub-format ARM_64_LPAE_SPLIT_S1 to create and set up split
> >pagetables (TTBR0 and TTBR1). The initialization function sets up the
> >correct va_size and sign extension bits and programs the TCR registers.
> >Split pagetable formats use their own own map/unmap wrappers to ensure
> >that the correct pagetable is selected based on the incoming iova but
> >most of the heavy lifting is common to the other formats.
> 
> I'm somewhat concerned that this implementation is very closely tied to the
> current Adreno use-case, and won't easily generalise in future to other
> potential TTBR1 uses which have been tossed around, like
> SMMUv3-without-substream-ID.

I haven't heard about these use-cases. I figured v3 would be all PASID all the
time. If you have details, I can see if I can avoid painting v3 into a corner.

> Furthermore, even for the Adreno pretend-PASID case it appears to be a bit
> too fragile for comfort - given that a DOMAIN_ATTR_SPLIT_TABLES domain
> doesn't look any different from a regular one from the users' point of view,
> what's to stop them making "without PASID" mappings in the lower half of the
> address space, and thus unwittingly pulling the rug out from under their own
> feet upon attaching an aux domain? In fact allocating a TTBR0 table at all
> for the main domain seems like little more than a waste of memory.

That makes sense. Would it work better if we made a type ARM_64_LPAE_TTBR1_S1
that only allocated memory for TTBR1 and set TBR.EDP0 to trigger faults for
TTBR0?

Then we could get rid of most of the extra stuff in io-pgtable-arm.c and I think
that would meet most of your concerns. 

Jordan

> >
> >Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
> >---
> >
> >  drivers/iommu/io-pgtable-arm.c | 261 +++++++++++++++++++++++++++++++++++++----
> >  drivers/iommu/io-pgtable.c     |   1 +
> >  include/linux/io-pgtable.h     |   2 +
> >  3 files changed, 240 insertions(+), 24 deletions(-)
> >
> >diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
> >index 161a7d56..aec35e5 100644
> >--- a/drivers/iommu/io-pgtable-arm.c
> >+++ b/drivers/iommu/io-pgtable-arm.c
> >@@ -118,7 +118,12 @@
> >  #define ARM_LPAE_TCR_TG0_64K		(1 << 14)
> >  #define ARM_LPAE_TCR_TG0_16K		(2 << 14)
> >+#define ARM_LPAE_TCR_TG1_4K		(0 << 30)
> >+#define ARM_LPAE_TCR_TG1_64K		(1 << 30)
> >+#define ARM_LPAE_TCR_TG1_16K		(2 << 30)
> >+
> >  #define ARM_LPAE_TCR_SH0_SHIFT		12
> >+#define ARM_LPAE_TCR_SH1_SHIFT		28
> >  #define ARM_LPAE_TCR_SH0_MASK		0x3
> >  #define ARM_LPAE_TCR_SH_NS		0
> >  #define ARM_LPAE_TCR_SH_OS		2
> >@@ -126,6 +131,8 @@
> >  #define ARM_LPAE_TCR_ORGN0_SHIFT	10
> >  #define ARM_LPAE_TCR_IRGN0_SHIFT	8
> >+#define ARM_LPAE_TCR_ORGN1_SHIFT	26
> >+#define ARM_LPAE_TCR_IRGN1_SHIFT	24
> >  #define ARM_LPAE_TCR_RGN_MASK		0x3
> >  #define ARM_LPAE_TCR_RGN_NC		0
> >  #define ARM_LPAE_TCR_RGN_WBWA		1
> >@@ -136,6 +143,7 @@
> >  #define ARM_LPAE_TCR_SL0_MASK		0x3
> >  #define ARM_LPAE_TCR_T0SZ_SHIFT		0
> >+#define ARM_LPAE_TCR_T1SZ_SHIFT		16
> >  #define ARM_LPAE_TCR_SZ_MASK		0xf
> >  #define ARM_LPAE_TCR_PS_SHIFT		16
> >@@ -152,6 +160,14 @@
> >  #define ARM_LPAE_TCR_PS_48_BIT		0x5ULL
> >  #define ARM_LPAE_TCR_PS_52_BIT		0x6ULL
> >+#define ARM_LPAE_TCR_SEP_SHIFT		47
> >+#define ARM_LPAE_TCR_SEP_31		(0x0ULL << ARM_LPAE_TCR_SEP_SHIFT)
> >+#define ARM_LPAE_TCR_SEP_35		(0x1ULL << ARM_LPAE_TCR_SEP_SHIFT)
> >+#define ARM_LPAE_TCR_SEP_39		(0x2ULL << ARM_LPAE_TCR_SEP_SHIFT)
> >+#define ARM_LPAE_TCR_SEP_41		(0x3ULL << ARM_LPAE_TCR_SEP_SHIFT)
> >+#define ARM_LPAE_TCR_SEP_43		(0x4ULL << ARM_LPAE_TCR_SEP_SHIFT)
> >+#define ARM_LPAE_TCR_SEP_UPSTREAM	(0x7ULL << ARM_LPAE_TCR_SEP_SHIFT)
> 
> This is a specific detail of SMMUv2, and nothing to do with the LPAE/AArch64
> VMSA formats.
> 
> >+
> >  #define ARM_LPAE_MAIR_ATTR_SHIFT(n)	((n) << 3)
> >  #define ARM_LPAE_MAIR_ATTR_MASK		0xff
> >  #define ARM_LPAE_MAIR_ATTR_DEVICE	0x04
> >@@ -179,11 +195,12 @@ struct arm_lpae_io_pgtable {
> >  	struct io_pgtable	iop;
> >  	int			levels;
> >+	u32			sep;
> >  	size_t			pgd_size;
> >  	unsigned long		pg_shift;
> >  	unsigned long		bits_per_level;
> >-	void			*pgd;
> >+	void			*pgd[2];
> >  };
> >  typedef u64 arm_lpae_iopte;
> >@@ -426,7 +443,8 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
> >  	arm_lpae_iopte pte;
> >  	if (data->iop.fmt == ARM_64_LPAE_S1 ||
> >-	    data->iop.fmt == ARM_32_LPAE_S1) {
> >+	    data->iop.fmt == ARM_32_LPAE_S1 ||
> >+	    data->iop.fmt == ARM_64_LPAE_SPLIT_S1) {
> >  		pte = ARM_LPAE_PTE_nG;
> >  		if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
> >  			pte |= ARM_LPAE_PTE_AP_RDONLY;
> >@@ -470,11 +488,10 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
> >  	return pte;
> >  }
> >-static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
> >-			phys_addr_t paddr, size_t size, int iommu_prot)
> >+static int _arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
> >+			phys_addr_t paddr, size_t size, int iommu_prot,
> >+			arm_lpae_iopte *ptep)
> >  {
> >-	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
> >-	arm_lpae_iopte *ptep = data->pgd;
> >  	int ret, lvl = ARM_LPAE_START_LVL(data);
> >  	arm_lpae_iopte prot;
> >@@ -497,12 +514,39 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
> >  	return ret;
> >  }
> >+static int arm_lpae_split_map(struct io_pgtable_ops *ops, unsigned long iova,
> >+		phys_addr_t paddr, size_t size, int iommu_prot)
> >+{
> >+	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
> >+	unsigned long mask = 1UL << data->sep;
> >+	arm_lpae_iopte *ptep;
> >+
> >+	if (iova & mask) {
> >+		ptep = data->pgd[1];
> >+		iova &= (mask - 1);
> >+	} else
> >+		ptep = data->pgd[0];
> 
> AFAICS, this logic effectively aliases the TTBR1 region across the entire
> upper half of the address hole, so bogus IOVAs may corrupt valid mappings
> instead of giving errors as expected.
> 
> >+
> >+	return _arm_lpae_map(data, iova, paddr, size, iommu_prot, ptep);
> >+}
> >+
> >+static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
> >+			phys_addr_t paddr, size_t size, int iommu_prot)
> >+{
> >+	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
> >+
> >+	return _arm_lpae_map(data, iova, paddr, size, iommu_prot, data->pgd[0]);
> >+}
> >+
> >  static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
> >  				    arm_lpae_iopte *ptep)
> >  {
> >  	arm_lpae_iopte *start, *end;
> >  	unsigned long table_size;
> >+	if (!ptep)
> >+		return;
> >+
> >  	if (lvl == ARM_LPAE_START_LVL(data))
> >  		table_size = data->pgd_size;
> >  	else
> >@@ -532,7 +576,8 @@ static void arm_lpae_free_pgtable(struct io_pgtable *iop)
> >  {
> >  	struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
> >-	__arm_lpae_free_pgtable(data, ARM_LPAE_START_LVL(data), data->pgd);
> >+	__arm_lpae_free_pgtable(data, ARM_LPAE_START_LVL(data), data->pgd[0]);
> >+	__arm_lpae_free_pgtable(data, ARM_LPAE_START_LVL(data), data->pgd[1]);
> >  	kfree(data);
> >  }
> >@@ -643,11 +688,28 @@ static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
> >  	return __arm_lpae_unmap(data, iova, size, lvl + 1, ptep);
> >  }
> >+static size_t arm_lpae_split_unmap(struct io_pgtable_ops *ops,
> >+				   unsigned long iova, size_t size)
> >+{
> >+	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
> >+	unsigned long mask = 1UL << data->sep;
> >+	arm_lpae_iopte *ptep;
> >+	int lvl = ARM_LPAE_START_LVL(data);
> >+
> >+	if (iova & mask) {
> >+		ptep = data->pgd[1];
> >+		iova &= (mask - 1);
> >+	} else
> >+		ptep = data->pgd[0];
> >+
> >+	return __arm_lpae_unmap(data, iova, size, lvl, ptep);
> >+}
> >+
> >  static size_t arm_lpae_unmap(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;
> >+	arm_lpae_iopte *ptep = data->pgd[0];
> >  	int lvl = ARM_LPAE_START_LVL(data);
> >  	if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias)))
> >@@ -656,11 +718,11 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
> >  	return __arm_lpae_unmap(data, iova, size, lvl, ptep);
> >  }
> >-static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
> >-					 unsigned long iova)
> >+static phys_addr_t _arm_lpae_iova_to_phys(struct arm_lpae_io_pgtable *data,
> >+					  unsigned long iova,
> >+					  arm_lpae_iopte *ptep)
> >  {
> >-	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
> >-	arm_lpae_iopte pte, *ptep = data->pgd;
> >+	arm_lpae_iopte pte;
> >  	int lvl = ARM_LPAE_START_LVL(data);
> >  	do {
> >@@ -692,6 +754,31 @@ static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
> >  	return iopte_to_paddr(pte, data) | iova;
> >  }
> >+
> >+static phys_addr_t arm_lpae_split_iova_to_phys(struct io_pgtable_ops *ops,
> >+					       unsigned long iova)
> >+{
> >+	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
> >+	unsigned long mask = 1UL << data->sep;
> >+	arm_lpae_iopte *ptep;
> >+
> >+	if (iova & mask) {
> >+		ptep = data->pgd[1];
> >+		iova &= (mask - 1);
> >+	} else
> >+		ptep = data->pgd[0];
> >+
> >+	return _arm_lpae_iova_to_phys(data, iova, ptep);
> >+}
> >+
> >+static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
> >+					 unsigned long iova)
> >+{
> >+	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
> >+
> >+	return _arm_lpae_iova_to_phys(data, iova, data->pgd[0]);
> >+}
> >+
> >  static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
> >  {
> >  	unsigned long granule, page_sizes;
> >@@ -771,6 +858,9 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
> >  	pgd_bits = va_bits - (data->bits_per_level * (data->levels - 1));
> >  	data->pgd_size = 1UL << (pgd_bits + ilog2(sizeof(arm_lpae_iopte)));
> >+	data->pgd[0] = NULL;
> >+	data->pgd[1] = NULL;
> >+
> >  	data->iop.ops = (struct io_pgtable_ops) {
> >  		.map		= arm_lpae_map,
> >  		.unmap		= arm_lpae_unmap,
> >@@ -780,8 +870,8 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
> >  	return data;
> >  }
> >-static struct io_pgtable *
> >-arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
> >+static struct arm_lpae_io_pgtable *
> >+_arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg)
> >  {
> >  	u64 reg;
> >  	struct arm_lpae_io_pgtable *data;
> >@@ -845,8 +935,6 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
> >  	reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
> >-	/* Disable speculative walks through TTBR1 */
> >-	reg |= ARM_LPAE_TCR_EPD1;
> 
> Not setting EPD1 at all could potentially lead to problems for systems not
> using split tables.
> 
> >  	cfg->arm_lpae_s1_cfg.tcr = reg;
> >  	/* MAIRs */
> >@@ -863,24 +951,143 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
> >  	cfg->arm_lpae_s1_cfg.mair[1] = 0;
> >  	/* Looking good; allocate a pgd */
> >-	data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
> >-	if (!data->pgd)
> >+	data->pgd[0] = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
> >+	if (!data->pgd[0])
> >  		goto out_free_data;
> >  	/* Ensure the empty pgd is visible before any actual TTBR write */
> >  	wmb();
> >  	/* TTBRs */
> >-	cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd);
> >+	cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd[0]);
> >  	cfg->arm_lpae_s1_cfg.ttbr[1] = 0;
> >+	return data;
> >+
> >+out_free_data:
> >+	kfree(data);
> >+	return NULL;
> >+}
> >+
> >+
> >+/* Allocate split pagetables */
> >+static struct io_pgtable *
> >+arm_64_lpae_alloc_pgtable_split_s1(struct io_pgtable_cfg *cfg, void *cookie)
> >+{
> >+	u64 reg;
> >+	struct arm_lpae_io_pgtable *data;
> >+	u32 sep;
> >+
> >+	/* Figure out what the sign extension bit should be */
> >+	switch (cfg->ias) {
> 
> IAS only tells you how wide the SMMU's address input is; what you really
> care about for sign extension is how wide the relevant masters' address
> *outputs* are. There's no way we can know that here, so AFAICS the only
> truly robust answer is for the caller requesting split tables to also
> provide the appropriate split point.
> 
> >+	case 32:
> >+	case 36:
> >+	case 40:
> >+	case 42:
> >+	case 44:
> >+		sep = cfg->ias - 1;
> >+		/* Adjust the address size to account for the extension bit */
> >+		cfg->ias--;
> >+		break;
> >+	case 48:
> >+		/* IAS of 48 is a special case, it has a dedicated bit */
> 
> That's not only not VMSA, but not even any architected SMMU behaviour; it
> just happens to be the way that one user of io-pgtable-arm currently mangles
> its IAS values.
> 
> Robin.
> 
> >+		sep = 48;
> >+		break;
> >+	default:
> >+		return NULL;
> >+	}
> >+
> >+	data = _arm_64_lpae_alloc_pgtable_s1(cfg);
> >+	if (!data)
> >+		return NULL;
> >+
> >+	/* Add the TTBR1 settings */
> >+	reg = cfg->arm_lpae_s1_cfg.tcr;
> >+
> >+	/* TCR */
> >+	reg |= (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH1_SHIFT) |
> >+	      (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN1_SHIFT) |
> >+	      (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN1_SHIFT);
> >+
> >+	switch (ARM_LPAE_GRANULE(data)) {
> >+	case SZ_4K:
> >+		reg |= ARM_LPAE_TCR_TG1_4K;
> >+		break;
> >+	case SZ_16K:
> >+		reg |= ARM_LPAE_TCR_TG1_16K;
> >+		break;
> >+	case SZ_64K:
> >+		reg |= ARM_LPAE_TCR_TG1_64K;
> >+		break;
> >+	}
> >+
> >+	reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T1SZ_SHIFT;
> >+
> >+	switch (sep) {
> >+	case 31:
> >+		reg |= ARM_LPAE_TCR_SEP_31;
> >+		break;
> >+	case 35:
> >+		reg |= ARM_LPAE_TCR_SEP_35;
> >+		break;
> >+	case 39:
> >+		reg |= ARM_LPAE_TCR_SEP_39;
> >+		break;
> >+	case 41:
> >+		reg |= ARM_LPAE_TCR_SEP_41;
> >+		break;
> >+	case 43:
> >+		reg |= ARM_LPAE_TCR_SEP_43;
> >+		break;
> >+	case 48:
> >+		reg |= ARM_LPAE_TCR_SEP_UPSTREAM;
> >+		break;
> >+	}
> >+
> >+	cfg->arm_lpae_s1_cfg.tcr = reg;
> >+
> >+	/* Allocate the TTBR1 pagetable */
> >+	data->pgd[1] = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
> >+	if (!data->pgd[1])
> >+		goto out_free_data;
> >+
> >+	/* Override the data ops with split table specific ops */
> >+	data->iop.ops = (struct io_pgtable_ops) {
> >+		.map		= arm_lpae_split_map,
> >+		.unmap		= arm_lpae_split_unmap,
> >+		.iova_to_phys	= arm_lpae_split_iova_to_phys,
> >+	};
> >+
> >+	/*
> >+	 * remember the sign extension bit, we'll need it later to figure out
> >+	 * which pagetable to use
> >+	 */
> >+	data->sep = sep;
> >+
> >+	/* Ensure the empty pgd is visible before any actual TTBR write */
> >+	wmb();
> >+
> >+	cfg->arm_lpae_s1_cfg.ttbr[1] = virt_to_phys(data->pgd[1]);
> >  	return &data->iop;
> >  out_free_data:
> >+	__arm_lpae_free_pages(data->pgd[0], data->pgd_size, cfg);
> >  	kfree(data);
> >  	return NULL;
> >  }
> >  static struct io_pgtable *
> >+arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
> >+{
> >+	struct arm_lpae_io_pgtable *data;
> >+
> >+	data = _arm_64_lpae_alloc_pgtable_s1(cfg);
> >+	if (!data)
> >+		return NULL;
> >+
> >+	return &data->iop;
> >+}
> >+
> >+static struct io_pgtable *
> >  arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
> >  {
> >  	u64 reg, sl;
> >@@ -960,15 +1167,15 @@ arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
> >  	cfg->arm_lpae_s2_cfg.vtcr = reg;
> >  	/* Allocate pgd pages */
> >-	data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
> >-	if (!data->pgd)
> >+	data->pgd[0] = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
> >+	if (!data->pgd[0])
> >  		goto out_free_data;
> >  	/* Ensure the empty pgd is visible before any actual TTBR write */
> >  	wmb();
> >  	/* VTTBR */
> >-	cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
> >+	cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd[0]);
> >  	return &data->iop;
> >  out_free_data:
> >@@ -1041,6 +1248,11 @@ struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
> >  	.free	= arm_lpae_free_pgtable,
> >  };
> >+struct io_pgtable_init_fns io_pgtable_arm_64_lpae_split_s1_init_fns = {
> >+	.alloc	= arm_64_lpae_alloc_pgtable_split_s1,
> >+	.free	= arm_lpae_free_pgtable,
> >+};
> >+
> >  struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = {
> >  	.alloc	= arm_64_lpae_alloc_pgtable_s2,
> >  	.free	= arm_lpae_free_pgtable,
> >@@ -1095,9 +1307,9 @@ static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
> >  	pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
> >  		cfg->pgsize_bitmap, cfg->ias);
> >-	pr_err("data: %d levels, 0x%zx pgd_size, %lu pg_shift, %lu bits_per_level, pgd @ %p\n",
> >+	pr_err("data: %d levels, 0x%zx pgd_size, %lu pg_shift, %lu bits_per_level, pgd @ %p %p\n",
> >  		data->levels, data->pgd_size, data->pg_shift,
> >-		data->bits_per_level, data->pgd);
> >+		data->bits_per_level, data->pgd[0], data->pgd[1]);
> >  }
> >  #define __FAIL(ops, i)	({						\
> >@@ -1112,6 +1324,7 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
> >  	static const enum io_pgtable_fmt fmts[] = {
> >  		ARM_64_LPAE_S1,
> >  		ARM_64_LPAE_S2,
> >+		ARM_64_LPAE_SPLIT_S1,
> >  	};
> >  	int i, j;
> >diff --git a/drivers/iommu/io-pgtable.c b/drivers/iommu/io-pgtable.c
> >index ced53e5..ed1985f 100644
> >--- a/drivers/iommu/io-pgtable.c
> >+++ b/drivers/iommu/io-pgtable.c
> >@@ -20,6 +20,7 @@ io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = {
> >  	[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
> >  	[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
> >  	[ARM_MALI_LPAE] = &io_pgtable_arm_mali_lpae_init_fns,
> >+	[ARM_64_LPAE_SPLIT_S1] = &io_pgtable_arm_64_lpae_split_s1_init_fns,
> >  #endif
> >  #ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S
> >  	[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
> >diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
> >index b5a450a..2ed0e6a 100644
> >--- a/include/linux/io-pgtable.h
> >+++ b/include/linux/io-pgtable.h
> >@@ -10,6 +10,7 @@ enum io_pgtable_fmt {
> >  	ARM_32_LPAE_S1,
> >  	ARM_32_LPAE_S2,
> >  	ARM_64_LPAE_S1,
> >+	ARM_64_LPAE_SPLIT_S1,
> >  	ARM_64_LPAE_S2,
> >  	ARM_V7S,
> >  	ARM_MALI_LPAE,
> >@@ -211,6 +212,7 @@ extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
> >  extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
> >  extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
> >  extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
> >+extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_split_s1_init_fns;
> >  extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns;
> >  extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns;
> >

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