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authorJoerg Roedel <jroedel@suse.de>2015-01-26 13:42:49 +0100
committerJoerg Roedel <jroedel@suse.de>2015-01-26 13:42:49 +0100
commitfd47b693c3c694da8210b5a0c01b1e379f4d9865 (patch)
tree84d8c5596df7f6eb295ac380b8ddb983af6c906d /drivers/iommu
parent89aa57d15f1833323b001c3764141311ac6179a2 (diff)
parent16753322983bcca0eca6d81f20d23277df0d6cf7 (diff)
downloadop-kernel-dev-fd47b693c3c694da8210b5a0c01b1e379f4d9865.zip
op-kernel-dev-fd47b693c3c694da8210b5a0c01b1e379f4d9865.tar.gz
Merge branch 'arm/smmu' into arm/renesas
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/Kconfig32
-rw-r--r--drivers/iommu/Makefile2
-rw-r--r--drivers/iommu/arm-smmu.c935
-rw-r--r--drivers/iommu/io-pgtable-arm.c986
-rw-r--r--drivers/iommu/io-pgtable.c82
-rw-r--r--drivers/iommu/io-pgtable.h143
6 files changed, 1561 insertions, 619 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 325188e..87060ad 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -13,6 +13,32 @@ menuconfig IOMMU_SUPPORT
if IOMMU_SUPPORT
+menu "Generic IOMMU Pagetable Support"
+
+# Selected by the actual pagetable implementations
+config IOMMU_IO_PGTABLE
+ bool
+
+config IOMMU_IO_PGTABLE_LPAE
+ bool "ARMv7/v8 Long Descriptor Format"
+ select IOMMU_IO_PGTABLE
+ help
+ Enable support for the ARM long descriptor pagetable format.
+ This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
+ sizes at both stage-1 and stage-2, as well as address spaces
+ up to 48-bits in size.
+
+config IOMMU_IO_PGTABLE_LPAE_SELFTEST
+ bool "LPAE selftests"
+ depends on IOMMU_IO_PGTABLE_LPAE
+ help
+ Enable self-tests for LPAE page table allocator. This performs
+ a series of page-table consistency checks during boot.
+
+ If unsure, say N here.
+
+endmenu
+
config OF_IOMMU
def_bool y
depends on OF && IOMMU_API
@@ -304,13 +330,13 @@ config SPAPR_TCE_IOMMU
config ARM_SMMU
bool "ARM Ltd. System MMU (SMMU) Support"
- depends on ARM64 || (ARM_LPAE && OF)
+ depends on ARM64 || ARM
select IOMMU_API
+ select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU if ARM
help
Support for implementations of the ARM System MMU architecture
- versions 1 and 2. The driver supports both v7l and v8l table
- formats with 4k and 64k page sizes.
+ versions 1 and 2.
Say Y here if your SoC includes an IOMMU device implementing
the ARM SMMU architecture.
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 7b976f2..d6889b4 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -1,6 +1,8 @@
obj-$(CONFIG_IOMMU_API) += iommu.o
obj-$(CONFIG_IOMMU_API) += iommu-traces.o
obj-$(CONFIG_IOMMU_API) += iommu-sysfs.o
+obj-$(CONFIG_IOMMU_IO_PGTABLE) += io-pgtable.o
+obj-$(CONFIG_IOMMU_IO_PGTABLE_LPAE) += io-pgtable-arm.o
obj-$(CONFIG_OF_IOMMU) += of_iommu.o
obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o msm_iommu_dev.o
obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 6cd47b7..1d6d43b 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -23,8 +23,6 @@
* - Stream-matching and stream-indexing
* - v7/v8 long-descriptor format
* - Non-secure access to the SMMU
- * - 4k and 64k pages, with contiguous pte hints.
- * - Up to 48-bit addressing (dependent on VA_BITS)
* - Context fault reporting
*/
@@ -36,7 +34,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iommu.h>
-#include <linux/mm.h>
+#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pci.h>
@@ -46,7 +44,7 @@
#include <linux/amba/bus.h>
-#include <asm/pgalloc.h>
+#include "io-pgtable.h"
/* Maximum number of stream IDs assigned to a single device */
#define MAX_MASTER_STREAMIDS MAX_PHANDLE_ARGS
@@ -71,40 +69,6 @@
((smmu->options & ARM_SMMU_OPT_SECURE_CFG_ACCESS) \
? 0x400 : 0))
-/* Page table bits */
-#define ARM_SMMU_PTE_XN (((pteval_t)3) << 53)
-#define ARM_SMMU_PTE_CONT (((pteval_t)1) << 52)
-#define ARM_SMMU_PTE_AF (((pteval_t)1) << 10)
-#define ARM_SMMU_PTE_SH_NS (((pteval_t)0) << 8)
-#define ARM_SMMU_PTE_SH_OS (((pteval_t)2) << 8)
-#define ARM_SMMU_PTE_SH_IS (((pteval_t)3) << 8)
-#define ARM_SMMU_PTE_PAGE (((pteval_t)3) << 0)
-
-#if PAGE_SIZE == SZ_4K
-#define ARM_SMMU_PTE_CONT_ENTRIES 16
-#elif PAGE_SIZE == SZ_64K
-#define ARM_SMMU_PTE_CONT_ENTRIES 32
-#else
-#define ARM_SMMU_PTE_CONT_ENTRIES 1
-#endif
-
-#define ARM_SMMU_PTE_CONT_SIZE (PAGE_SIZE * ARM_SMMU_PTE_CONT_ENTRIES)
-#define ARM_SMMU_PTE_CONT_MASK (~(ARM_SMMU_PTE_CONT_SIZE - 1))
-
-/* Stage-1 PTE */
-#define ARM_SMMU_PTE_AP_UNPRIV (((pteval_t)1) << 6)
-#define ARM_SMMU_PTE_AP_RDONLY (((pteval_t)2) << 6)
-#define ARM_SMMU_PTE_ATTRINDX_SHIFT 2
-#define ARM_SMMU_PTE_nG (((pteval_t)1) << 11)
-
-/* Stage-2 PTE */
-#define ARM_SMMU_PTE_HAP_FAULT (((pteval_t)0) << 6)
-#define ARM_SMMU_PTE_HAP_READ (((pteval_t)1) << 6)
-#define ARM_SMMU_PTE_HAP_WRITE (((pteval_t)2) << 6)
-#define ARM_SMMU_PTE_MEMATTR_OIWB (((pteval_t)0xf) << 2)
-#define ARM_SMMU_PTE_MEMATTR_NC (((pteval_t)0x5) << 2)
-#define ARM_SMMU_PTE_MEMATTR_DEV (((pteval_t)0x1) << 2)
-
/* Configuration registers */
#define ARM_SMMU_GR0_sCR0 0x0
#define sCR0_CLIENTPD (1 << 0)
@@ -132,17 +96,12 @@
#define ARM_SMMU_GR0_sGFSYNR0 0x50
#define ARM_SMMU_GR0_sGFSYNR1 0x54
#define ARM_SMMU_GR0_sGFSYNR2 0x58
-#define ARM_SMMU_GR0_PIDR0 0xfe0
-#define ARM_SMMU_GR0_PIDR1 0xfe4
-#define ARM_SMMU_GR0_PIDR2 0xfe8
#define ID0_S1TS (1 << 30)
#define ID0_S2TS (1 << 29)
#define ID0_NTS (1 << 28)
#define ID0_SMS (1 << 27)
-#define ID0_PTFS_SHIFT 24
-#define ID0_PTFS_MASK 0x2
-#define ID0_PTFS_V8_ONLY 0x2
+#define ID0_ATOSNS (1 << 26)
#define ID0_CTTW (1 << 14)
#define ID0_NUMIRPT_SHIFT 16
#define ID0_NUMIRPT_MASK 0xff
@@ -169,11 +128,7 @@
#define ID2_PTFS_16K (1 << 13)
#define ID2_PTFS_64K (1 << 14)
-#define PIDR2_ARCH_SHIFT 4
-#define PIDR2_ARCH_MASK 0xf
-
/* Global TLB invalidation */
-#define ARM_SMMU_GR0_STLBIALL 0x60
#define ARM_SMMU_GR0_TLBIVMID 0x64
#define ARM_SMMU_GR0_TLBIALLNSNH 0x68
#define ARM_SMMU_GR0_TLBIALLH 0x6c
@@ -231,13 +186,25 @@
#define ARM_SMMU_CB_TTBCR2 0x10
#define ARM_SMMU_CB_TTBR0_LO 0x20
#define ARM_SMMU_CB_TTBR0_HI 0x24
+#define ARM_SMMU_CB_TTBR1_LO 0x28
+#define ARM_SMMU_CB_TTBR1_HI 0x2c
#define ARM_SMMU_CB_TTBCR 0x30
#define ARM_SMMU_CB_S1_MAIR0 0x38
+#define ARM_SMMU_CB_S1_MAIR1 0x3c
+#define ARM_SMMU_CB_PAR_LO 0x50
+#define ARM_SMMU_CB_PAR_HI 0x54
#define ARM_SMMU_CB_FSR 0x58
#define ARM_SMMU_CB_FAR_LO 0x60
#define ARM_SMMU_CB_FAR_HI 0x64
#define ARM_SMMU_CB_FSYNR0 0x68
+#define ARM_SMMU_CB_S1_TLBIVA 0x600
#define ARM_SMMU_CB_S1_TLBIASID 0x610
+#define ARM_SMMU_CB_S1_TLBIVAL 0x620
+#define ARM_SMMU_CB_S2_TLBIIPAS2 0x630
+#define ARM_SMMU_CB_S2_TLBIIPAS2L 0x638
+#define ARM_SMMU_CB_ATS1PR_LO 0x800
+#define ARM_SMMU_CB_ATS1PR_HI 0x804
+#define ARM_SMMU_CB_ATSR 0x8f0
#define SCTLR_S1_ASIDPNE (1 << 12)
#define SCTLR_CFCFG (1 << 7)
@@ -249,47 +216,16 @@
#define SCTLR_M (1 << 0)
#define SCTLR_EAE_SBOP (SCTLR_AFE | SCTLR_TRE)
-#define RESUME_RETRY (0 << 0)
-#define RESUME_TERMINATE (1 << 0)
-
-#define TTBCR_EAE (1 << 31)
+#define CB_PAR_F (1 << 0)
-#define TTBCR_PASIZE_SHIFT 16
-#define TTBCR_PASIZE_MASK 0x7
+#define ATSR_ACTIVE (1 << 0)
-#define TTBCR_TG0_4K (0 << 14)
-#define TTBCR_TG0_64K (1 << 14)
-
-#define TTBCR_SH0_SHIFT 12
-#define TTBCR_SH0_MASK 0x3
-#define TTBCR_SH_NS 0
-#define TTBCR_SH_OS 2
-#define TTBCR_SH_IS 3
-
-#define TTBCR_ORGN0_SHIFT 10
-#define TTBCR_IRGN0_SHIFT 8
-#define TTBCR_RGN_MASK 0x3
-#define TTBCR_RGN_NC 0
-#define TTBCR_RGN_WBWA 1
-#define TTBCR_RGN_WT 2
-#define TTBCR_RGN_WB 3
-
-#define TTBCR_SL0_SHIFT 6
-#define TTBCR_SL0_MASK 0x3
-#define TTBCR_SL0_LVL_2 0
-#define TTBCR_SL0_LVL_1 1
-
-#define TTBCR_T1SZ_SHIFT 16
-#define TTBCR_T0SZ_SHIFT 0
-#define TTBCR_SZ_MASK 0xf
+#define RESUME_RETRY (0 << 0)
+#define RESUME_TERMINATE (1 << 0)
#define TTBCR2_SEP_SHIFT 15
#define TTBCR2_SEP_MASK 0x7
-#define TTBCR2_PASIZE_SHIFT 0
-#define TTBCR2_PASIZE_MASK 0x7
-
-/* Common definitions for PASize and SEP fields */
#define TTBCR2_ADDR_32 0
#define TTBCR2_ADDR_36 1
#define TTBCR2_ADDR_40 2
@@ -297,16 +233,7 @@
#define TTBCR2_ADDR_44 4
#define TTBCR2_ADDR_48 5
-#define TTBRn_HI_ASID_SHIFT 16
-
-#define MAIR_ATTR_SHIFT(n) ((n) << 3)
-#define MAIR_ATTR_MASK 0xff
-#define MAIR_ATTR_DEVICE 0x04
-#define MAIR_ATTR_NC 0x44
-#define MAIR_ATTR_WBRWA 0xff
-#define MAIR_ATTR_IDX_NC 0
-#define MAIR_ATTR_IDX_CACHE 1
-#define MAIR_ATTR_IDX_DEV 2
+#define TTBRn_HI_ASID_SHIFT 16
#define FSR_MULTI (1 << 31)
#define FSR_SS (1 << 30)
@@ -366,6 +293,7 @@ struct arm_smmu_device {
#define ARM_SMMU_FEAT_TRANS_S1 (1 << 2)
#define ARM_SMMU_FEAT_TRANS_S2 (1 << 3)
#define ARM_SMMU_FEAT_TRANS_NESTED (1 << 4)
+#define ARM_SMMU_FEAT_TRANS_OPS (1 << 5)
u32 features;
#define ARM_SMMU_OPT_SECURE_CFG_ACCESS (1 << 0)
@@ -380,10 +308,9 @@ struct arm_smmu_device {
u32 num_mapping_groups;
DECLARE_BITMAP(smr_map, ARM_SMMU_MAX_SMRS);
- unsigned long s1_input_size;
- unsigned long s1_output_size;
- unsigned long s2_input_size;
- unsigned long s2_output_size;
+ unsigned long va_size;
+ unsigned long ipa_size;
+ unsigned long pa_size;
u32 num_global_irqs;
u32 num_context_irqs;
@@ -397,7 +324,6 @@ struct arm_smmu_cfg {
u8 cbndx;
u8 irptndx;
u32 cbar;
- pgd_t *pgd;
};
#define INVALID_IRPTNDX 0xff
@@ -412,11 +338,15 @@ enum arm_smmu_domain_stage {
struct arm_smmu_domain {
struct arm_smmu_device *smmu;
+ struct io_pgtable_ops *pgtbl_ops;
+ spinlock_t pgtbl_lock;
struct arm_smmu_cfg cfg;
enum arm_smmu_domain_stage stage;
- spinlock_t lock;
+ struct mutex init_mutex; /* Protects smmu pointer */
};
+static struct iommu_ops arm_smmu_ops;
+
static DEFINE_SPINLOCK(arm_smmu_devices_lock);
static LIST_HEAD(arm_smmu_devices);
@@ -597,7 +527,7 @@ static void __arm_smmu_free_bitmap(unsigned long *map, int idx)
}
/* Wait for any pending TLB invalidations to complete */
-static void arm_smmu_tlb_sync(struct arm_smmu_device *smmu)
+static void __arm_smmu_tlb_sync(struct arm_smmu_device *smmu)
{
int count = 0;
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
@@ -615,12 +545,19 @@ static void arm_smmu_tlb_sync(struct arm_smmu_device *smmu)
}
}
-static void arm_smmu_tlb_inv_context(struct arm_smmu_domain *smmu_domain)
+static void arm_smmu_tlb_sync(void *cookie)
{
+ struct arm_smmu_domain *smmu_domain = cookie;
+ __arm_smmu_tlb_sync(smmu_domain->smmu);
+}
+
+static void arm_smmu_tlb_inv_context(void *cookie)
+{
+ struct arm_smmu_domain *smmu_domain = cookie;
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
struct arm_smmu_device *smmu = smmu_domain->smmu;
- void __iomem *base = ARM_SMMU_GR0(smmu);
bool stage1 = cfg->cbar != CBAR_TYPE_S2_TRANS;
+ void __iomem *base;
if (stage1) {
base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
@@ -632,9 +569,76 @@ static void arm_smmu_tlb_inv_context(struct arm_smmu_domain *smmu_domain)
base + ARM_SMMU_GR0_TLBIVMID);
}
- arm_smmu_tlb_sync(smmu);
+ __arm_smmu_tlb_sync(smmu);
+}
+
+static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
+ bool leaf, void *cookie)
+{
+ struct arm_smmu_domain *smmu_domain = cookie;
+ struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ bool stage1 = cfg->cbar != CBAR_TYPE_S2_TRANS;
+ void __iomem *reg;
+
+ if (stage1) {
+ reg = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+ reg += leaf ? ARM_SMMU_CB_S1_TLBIVAL : ARM_SMMU_CB_S1_TLBIVA;
+
+ if (!IS_ENABLED(CONFIG_64BIT) || smmu->version == ARM_SMMU_V1) {
+ iova &= ~12UL;
+ iova |= ARM_SMMU_CB_ASID(cfg);
+ writel_relaxed(iova, reg);
+#ifdef CONFIG_64BIT
+ } else {
+ iova >>= 12;
+ iova |= (u64)ARM_SMMU_CB_ASID(cfg) << 48;
+ writeq_relaxed(iova, reg);
+#endif
+ }
+#ifdef CONFIG_64BIT
+ } else if (smmu->version == ARM_SMMU_V2) {
+ reg = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+ reg += leaf ? ARM_SMMU_CB_S2_TLBIIPAS2L :
+ ARM_SMMU_CB_S2_TLBIIPAS2;
+ writeq_relaxed(iova >> 12, reg);
+#endif
+ } else {
+ reg = ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_TLBIVMID;
+ writel_relaxed(ARM_SMMU_CB_VMID(cfg), reg);
+ }
+}
+
+static void arm_smmu_flush_pgtable(void *addr, size_t size, void *cookie)
+{
+ struct arm_smmu_domain *smmu_domain = cookie;
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ unsigned long offset = (unsigned long)addr & ~PAGE_MASK;
+
+
+ /* Ensure new page tables are visible to the hardware walker */
+ if (smmu->features & ARM_SMMU_FEAT_COHERENT_WALK) {
+ dsb(ishst);
+ } else {
+ /*
+ * If the SMMU can't walk tables in the CPU caches, treat them
+ * like non-coherent DMA since we need to flush the new entries
+ * all the way out to memory. There's no possibility of
+ * recursion here as the SMMU table walker will not be wired
+ * through another SMMU.
+ */
+ dma_map_page(smmu->dev, virt_to_page(addr), offset, size,
+ DMA_TO_DEVICE);
+ }
}
+static struct iommu_gather_ops arm_smmu_gather_ops = {
+ .tlb_flush_all = arm_smmu_tlb_inv_context,
+ .tlb_add_flush = arm_smmu_tlb_inv_range_nosync,
+ .tlb_sync = arm_smmu_tlb_sync,
+ .flush_pgtable = arm_smmu_flush_pgtable,
+};
+
static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
{
int flags, ret;
@@ -712,29 +716,8 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
return IRQ_HANDLED;
}
-static void arm_smmu_flush_pgtable(struct arm_smmu_device *smmu, void *addr,
- size_t size)
-{
- unsigned long offset = (unsigned long)addr & ~PAGE_MASK;
-
-
- /* Ensure new page tables are visible to the hardware walker */
- if (smmu->features & ARM_SMMU_FEAT_COHERENT_WALK) {
- dsb(ishst);
- } else {
- /*
- * If the SMMU can't walk tables in the CPU caches, treat them
- * like non-coherent DMA since we need to flush the new entries
- * all the way out to memory. There's no possibility of
- * recursion here as the SMMU table walker will not be wired
- * through another SMMU.
- */
- dma_map_page(smmu->dev, virt_to_page(addr), offset, size,
- DMA_TO_DEVICE);
- }
-}
-
-static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain)
+static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain,
+ struct io_pgtable_cfg *pgtbl_cfg)
{
u32 reg;
bool stage1;
@@ -771,124 +754,68 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain)
#else
reg = CBA2R_RW64_32BIT;
#endif
- writel_relaxed(reg,
- gr1_base + ARM_SMMU_GR1_CBA2R(cfg->cbndx));
-
- /* TTBCR2 */
- switch (smmu->s1_input_size) {
- case 32:
- reg = (TTBCR2_ADDR_32 << TTBCR2_SEP_SHIFT);
- break;
- case 36:
- reg = (TTBCR2_ADDR_36 << TTBCR2_SEP_SHIFT);
- break;
- case 39:
- case 40:
- reg = (TTBCR2_ADDR_40 << TTBCR2_SEP_SHIFT);
- break;
- case 42:
- reg = (TTBCR2_ADDR_42 << TTBCR2_SEP_SHIFT);
- break;
- case 44:
- reg = (TTBCR2_ADDR_44 << TTBCR2_SEP_SHIFT);
- break;
- case 48:
- reg = (TTBCR2_ADDR_48 << TTBCR2_SEP_SHIFT);
- break;
- }
-
- switch (smmu->s1_output_size) {
- case 32:
- reg |= (TTBCR2_ADDR_32 << TTBCR2_PASIZE_SHIFT);
- break;
- case 36:
- reg |= (TTBCR2_ADDR_36 << TTBCR2_PASIZE_SHIFT);
- break;
- case 39:
- case 40:
- reg |= (TTBCR2_ADDR_40 << TTBCR2_PASIZE_SHIFT);
- break;
- case 42:
- reg |= (TTBCR2_ADDR_42 << TTBCR2_PASIZE_SHIFT);
- break;
- case 44:
- reg |= (TTBCR2_ADDR_44 << TTBCR2_PASIZE_SHIFT);
- break;
- case 48:
- reg |= (TTBCR2_ADDR_48 << TTBCR2_PASIZE_SHIFT);
- break;
- }
-
- if (stage1)
- writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR2);
+ writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBA2R(cfg->cbndx));
}
- /* TTBR0 */
- arm_smmu_flush_pgtable(smmu, cfg->pgd,
- PTRS_PER_PGD * sizeof(pgd_t));
- reg = __pa(cfg->pgd);
- writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_LO);
- reg = (phys_addr_t)__pa(cfg->pgd) >> 32;
- if (stage1)
+ /* TTBRs */
+ if (stage1) {
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_LO);
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0] >> 32;
reg |= ARM_SMMU_CB_ASID(cfg) << TTBRn_HI_ASID_SHIFT;
- writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_HI);
-
- /*
- * TTBCR
- * We use long descriptor, with inner-shareable WBWA tables in TTBR0.
- */
- if (smmu->version > ARM_SMMU_V1) {
- if (PAGE_SIZE == SZ_4K)
- reg = TTBCR_TG0_4K;
- else
- reg = TTBCR_TG0_64K;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_HI);
- if (!stage1) {
- reg |= (64 - smmu->s2_input_size) << TTBCR_T0SZ_SHIFT;
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[1];
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR1_LO);
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[1] >> 32;
+ reg |= ARM_SMMU_CB_ASID(cfg) << TTBRn_HI_ASID_SHIFT;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR1_HI);
+ } else {
+ reg = pgtbl_cfg->arm_lpae_s2_cfg.vttbr;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_LO);
+ reg = pgtbl_cfg->arm_lpae_s2_cfg.vttbr >> 32;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_HI);
+ }
- switch (smmu->s2_output_size) {
+ /* TTBCR */
+ if (stage1) {
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.tcr;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR);
+ if (smmu->version > ARM_SMMU_V1) {
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.tcr >> 32;
+ switch (smmu->va_size) {
case 32:
- reg |= (TTBCR2_ADDR_32 << TTBCR_PASIZE_SHIFT);
+ reg |= (TTBCR2_ADDR_32 << TTBCR2_SEP_SHIFT);
break;
case 36:
- reg |= (TTBCR2_ADDR_36 << TTBCR_PASIZE_SHIFT);
+ reg |= (TTBCR2_ADDR_36 << TTBCR2_SEP_SHIFT);
break;
case 40:
- reg |= (TTBCR2_ADDR_40 << TTBCR_PASIZE_SHIFT);
+ reg |= (TTBCR2_ADDR_40 << TTBCR2_SEP_SHIFT);
break;
case 42:
- reg |= (TTBCR2_ADDR_42 << TTBCR_PASIZE_SHIFT);
+ reg |= (TTBCR2_ADDR_42 << TTBCR2_SEP_SHIFT);
break;
case 44:
- reg |= (TTBCR2_ADDR_44 << TTBCR_PASIZE_SHIFT);
+ reg |= (TTBCR2_ADDR_44 << TTBCR2_SEP_SHIFT);
break;
case 48:
- reg |= (TTBCR2_ADDR_48 << TTBCR_PASIZE_SHIFT);
+ reg |= (TTBCR2_ADDR_48 << TTBCR2_SEP_SHIFT);
break;
}
- } else {
- reg |= (64 - smmu->s1_input_size) << TTBCR_T0SZ_SHIFT;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR2);
}
} else {
- reg = 0;
+ reg = pgtbl_cfg->arm_lpae_s2_cfg.vtcr;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR);
}
- reg |= TTBCR_EAE |
- (TTBCR_SH_IS << TTBCR_SH0_SHIFT) |
- (TTBCR_RGN_WBWA << TTBCR_ORGN0_SHIFT) |
- (TTBCR_RGN_WBWA << TTBCR_IRGN0_SHIFT);
-
- if (!stage1)
- reg |= (TTBCR_SL0_LVL_1 << TTBCR_SL0_SHIFT);
-
- writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR);
-
- /* MAIR0 (stage-1 only) */
+ /* MAIRs (stage-1 only) */
if (stage1) {
- reg = (MAIR_ATTR_NC << MAIR_ATTR_SHIFT(MAIR_ATTR_IDX_NC)) |
- (MAIR_ATTR_WBRWA << MAIR_ATTR_SHIFT(MAIR_ATTR_IDX_CACHE)) |
- (MAIR_ATTR_DEVICE << MAIR_ATTR_SHIFT(MAIR_ATTR_IDX_DEV));
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.mair[0];
writel_relaxed(reg, cb_base + ARM_SMMU_CB_S1_MAIR0);
+ reg = pgtbl_cfg->arm_lpae_s1_cfg.mair[1];
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_S1_MAIR1);
}
/* SCTLR */
@@ -905,11 +832,14 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
struct arm_smmu_device *smmu)
{
int irq, start, ret = 0;
- unsigned long flags;
+ unsigned long ias, oas;
+ struct io_pgtable_ops *pgtbl_ops;
+ struct io_pgtable_cfg pgtbl_cfg;
+ enum io_pgtable_fmt fmt;
struct arm_smmu_domain *smmu_domain = domain->priv;
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
- spin_lock_irqsave(&smmu_domain->lock, flags);
+ mutex_lock(&smmu_domain->init_mutex);
if (smmu_domain->smmu)
goto out_unlock;
@@ -940,6 +870,12 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
case ARM_SMMU_DOMAIN_S1:
cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS;
start = smmu->num_s2_context_banks;
+ ias = smmu->va_size;
+ oas = smmu->ipa_size;
+ if (IS_ENABLED(CONFIG_64BIT))
+ fmt = ARM_64_LPAE_S1;
+ else
+ fmt = ARM_32_LPAE_S1;
break;
case ARM_SMMU_DOMAIN_NESTED:
/*
@@ -949,6 +885,12 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
case ARM_SMMU_DOMAIN_S2:
cfg->cbar = CBAR_TYPE_S2_TRANS;
start = 0;
+ ias = smmu->ipa_size;
+ oas = smmu->pa_size;
+ if (IS_ENABLED(CONFIG_64BIT))
+ fmt = ARM_64_LPAE_S2;
+ else
+ fmt = ARM_32_LPAE_S2;
break;
default:
ret = -EINVAL;
@@ -968,10 +910,30 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
cfg->irptndx = cfg->cbndx;
}
- ACCESS_ONCE(smmu_domain->smmu) = smmu;
- arm_smmu_init_context_bank(smmu_domain);
- spin_unlock_irqrestore(&smmu_domain->lock, flags);
+ pgtbl_cfg = (struct io_pgtable_cfg) {
+ .pgsize_bitmap = arm_smmu_ops.pgsize_bitmap,
+ .ias = ias,
+ .oas = oas,
+ .tlb = &arm_smmu_gather_ops,
+ };
+
+ smmu_domain->smmu = smmu;
+ pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain);
+ if (!pgtbl_ops) {
+ ret = -ENOMEM;
+ goto out_clear_smmu;
+ }
+
+ /* Update our support page sizes to reflect the page table format */
+ arm_smmu_ops.pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
+ /* Initialise the context bank with our page table cfg */
+ arm_smmu_init_context_bank(smmu_domain, &pgtbl_cfg);
+
+ /*
+ * Request context fault interrupt. Do this last to avoid the
+ * handler seeing a half-initialised domain state.
+ */
irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx];
ret = request_irq(irq, arm_smmu_context_fault, IRQF_SHARED,
"arm-smmu-context-fault", domain);
@@ -981,10 +943,16 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
cfg->irptndx = INVALID_IRPTNDX;
}
+ mutex_unlock(&smmu_domain->init_mutex);
+
+ /* Publish page table ops for map/unmap */
+ smmu_domain->pgtbl_ops = pgtbl_ops;
return 0;
+out_clear_smmu:
+ smmu_domain->smmu = NULL;
out_unlock:
- spin_unlock_irqrestore(&smmu_domain->lock, flags);
+ mutex_unlock(&smmu_domain->init_mutex);
return ret;
}
@@ -999,23 +967,27 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
if (!smmu)
return;
- /* Disable the context bank and nuke the TLB before freeing it. */
+ /*
+ * Disable the context bank and free the page tables before freeing
+ * it.
+ */
cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
writel_relaxed(0, cb_base + ARM_SMMU_CB_SCTLR);
- arm_smmu_tlb_inv_context(smmu_domain);
if (cfg->irptndx != INVALID_IRPTNDX) {
irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx];
free_irq(irq, domain);
}
+ if (smmu_domain->pgtbl_ops)
+ free_io_pgtable_ops(smmu_domain->pgtbl_ops);
+
__arm_smmu_free_bitmap(smmu->context_map, cfg->cbndx);
}
static int arm_smmu_domain_init(struct iommu_domain *domain)
{
struct arm_smmu_domain *smmu_domain;
- pgd_t *pgd;
/*
* Allocate the domain and initialise some of its data structures.
@@ -1026,81 +998,10 @@ static int arm_smmu_domain_init(struct iommu_domain *domain)
if (!smmu_domain)
return -ENOMEM;
- pgd = kcalloc(PTRS_PER_PGD, sizeof(pgd_t), GFP_KERNEL);
- if (!pgd)
- goto out_free_domain;
- smmu_domain->cfg.pgd = pgd;
-
- spin_lock_init(&smmu_domain->lock);
+ mutex_init(&smmu_domain->init_mutex);
+ spin_lock_init(&smmu_domain->pgtbl_lock);
domain->priv = smmu_domain;
return 0;
-
-out_free_domain:
- kfree(smmu_domain);
- return -ENOMEM;
-}
-
-static void arm_smmu_free_ptes(pmd_t *pmd)
-{
- pgtable_t table = pmd_pgtable(*pmd);
-
- __free_page(table);
-}
-
-static void arm_smmu_free_pmds(pud_t *pud)
-{
- int i;
- pmd_t *pmd, *pmd_base = pmd_offset(pud, 0);
-
- pmd = pmd_base;
- for (i = 0; i < PTRS_PER_PMD; ++i) {
- if (pmd_none(*pmd))
- continue;
-
- arm_smmu_free_ptes(pmd);
- pmd++;
- }
-
- pmd_free(NULL, pmd_base);
-}
-
-static void arm_smmu_free_puds(pgd_t *pgd)
-{
- int i;
- pud_t *pud, *pud_base = pud_offset(pgd, 0);
-
- pud = pud_base;
- for (i = 0; i < PTRS_PER_PUD; ++i) {
- if (pud_none(*pud))
- continue;
-
- arm_smmu_free_pmds(pud);
- pud++;
- }
-
- pud_free(NULL, pud_base);
-}
-
-static void arm_smmu_free_pgtables(struct arm_smmu_domain *smmu_domain)
-{
- int i;
- struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
- pgd_t *pgd, *pgd_base = cfg->pgd;
-
- /*
- * Recursively free the page tables for this domain. We don't
- * care about speculative TLB filling because the tables should
- * not be active in any context bank at this point (SCTLR.M is 0).
- */
- pgd = pgd_base;
- for (i = 0; i < PTRS_PER_PGD; ++i) {
- if (pgd_none(*pgd))
- continue;
- arm_smmu_free_puds(pgd);
- pgd++;
- }
-
- kfree(pgd_base);
}
static void arm_smmu_domain_destroy(struct iommu_domain *domain)
@@ -1112,7 +1013,6 @@ static void arm_smmu_domain_destroy(struct iommu_domain *domain)
* already been detached.
*/
arm_smmu_destroy_domain_context(domain);
- arm_smmu_free_pgtables(smmu_domain);
kfree(smmu_domain);
}
@@ -1244,7 +1144,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret;
struct arm_smmu_domain *smmu_domain = domain->priv;
- struct arm_smmu_device *smmu, *dom_smmu;
+ struct arm_smmu_device *smmu;
struct arm_smmu_master_cfg *cfg;
smmu = find_smmu_for_device(dev);
@@ -1258,21 +1158,16 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
return -EEXIST;
}
+ /* Ensure that the domain is finalised */
+ ret = arm_smmu_init_domain_context(domain, smmu);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
/*
* Sanity check the domain. We don't support domains across
* different SMMUs.
*/
- dom_smmu = ACCESS_ONCE(smmu_domain->smmu);
- if (!dom_smmu) {
- /* Now that we have a master, we can finalise the domain */
- ret = arm_smmu_init_domain_context(domain, smmu);
- if (IS_ERR_VALUE(ret))
- return ret;
-
- dom_smmu = smmu_domain->smmu;
- }
-
- if (dom_smmu != smmu) {
+ if (smmu_domain->smmu != smmu) {
dev_err(dev,
"cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
@@ -1303,293 +1198,103 @@ static void arm_smmu_detach_dev(struct iommu_domain *domain, struct device *dev)
arm_smmu_domain_remove_master(smmu_domain, cfg);
}
-static bool arm_smmu_pte_is_contiguous_range(unsigned long addr,
- unsigned long end)
-{
- return !(addr & ~ARM_SMMU_PTE_CONT_MASK) &&
- (addr + ARM_SMMU_PTE_CONT_SIZE <= end);
-}
-
-static int arm_smmu_alloc_init_pte(struct arm_smmu_device *smmu, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- unsigned long pfn, int prot, int stage)
-{
- pte_t *pte, *start;
- pteval_t pteval = ARM_SMMU_PTE_PAGE | ARM_SMMU_PTE_AF;
-
- if (pmd_none(*pmd)) {
- /* Allocate a new set of tables */
- pgtable_t table = alloc_page(GFP_ATOMIC|__GFP_ZERO);
-
- if (!table)
- return -ENOMEM;
-
- arm_smmu_flush_pgtable(smmu, page_address(table), PAGE_SIZE);
- pmd_populate(NULL, pmd, table);
- arm_smmu_flush_pgtable(smmu, pmd, sizeof(*pmd));
- }
-
- if (stage == 1) {
- pteval |= ARM_SMMU_PTE_AP_UNPRIV | ARM_SMMU_PTE_nG;
- if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
- pteval |= ARM_SMMU_PTE_AP_RDONLY;
-
- if (prot & IOMMU_CACHE)
- pteval |= (MAIR_ATTR_IDX_CACHE <<
- ARM_SMMU_PTE_ATTRINDX_SHIFT);
- } else {
- pteval |= ARM_SMMU_PTE_HAP_FAULT;
- if (prot & IOMMU_READ)
- pteval |= ARM_SMMU_PTE_HAP_READ;
- if (prot & IOMMU_WRITE)
- pteval |= ARM_SMMU_PTE_HAP_WRITE;
- if (prot & IOMMU_CACHE)
- pteval |= ARM_SMMU_PTE_MEMATTR_OIWB;
- else
- pteval |= ARM_SMMU_PTE_MEMATTR_NC;
- }
-
- if (prot & IOMMU_NOEXEC)
- pteval |= ARM_SMMU_PTE_XN;
-
- /* If no access, create a faulting entry to avoid TLB fills */
- if (!(prot & (IOMMU_READ | IOMMU_WRITE)))
- pteval &= ~ARM_SMMU_PTE_PAGE;
-
- pteval |= ARM_SMMU_PTE_SH_IS;
- start = pmd_page_vaddr(*pmd) + pte_index(addr);
- pte = start;
-
- /*
- * Install the page table entries. This is fairly complicated
- * since we attempt to make use of the contiguous hint in the
- * ptes where possible. The contiguous hint indicates a series
- * of ARM_SMMU_PTE_CONT_ENTRIES ptes mapping a physically
- * contiguous region with the following constraints:
- *
- * - The region start is aligned to ARM_SMMU_PTE_CONT_SIZE
- * - Each pte in the region has the contiguous hint bit set
- *
- * This complicates unmapping (also handled by this code, when
- * neither IOMMU_READ or IOMMU_WRITE are set) because it is
- * possible, yet highly unlikely, that a client may unmap only
- * part of a contiguous range. This requires clearing of the
- * contiguous hint bits in the range before installing the new
- * faulting entries.
- *
- * Note that re-mapping an address range without first unmapping
- * it is not supported, so TLB invalidation is not required here
- * and is instead performed at unmap and domain-init time.
- */
- do {
- int i = 1;
-
- pteval &= ~ARM_SMMU_PTE_CONT;
-
- if (arm_smmu_pte_is_contiguous_range(addr, end)) {
- i = ARM_SMMU_PTE_CONT_ENTRIES;
- pteval |= ARM_SMMU_PTE_CONT;
- } else if (pte_val(*pte) &
- (ARM_SMMU_PTE_CONT | ARM_SMMU_PTE_PAGE)) {
- int j;
- pte_t *cont_start;
- unsigned long idx = pte_index(addr);
-
- idx &= ~(ARM_SMMU_PTE_CONT_ENTRIES - 1);
- cont_start = pmd_page_vaddr(*pmd) + idx;
- for (j = 0; j < ARM_SMMU_PTE_CONT_ENTRIES; ++j)
- pte_val(*(cont_start + j)) &=
- ~ARM_SMMU_PTE_CONT;
-
- arm_smmu_flush_pgtable(smmu, cont_start,
- sizeof(*pte) *
- ARM_SMMU_PTE_CONT_ENTRIES);
- }
-
- do {
- *pte = pfn_pte(pfn, __pgprot(pteval));
- } while (pte++, pfn++, addr += PAGE_SIZE, --i);
- } while (addr != end);
-
- arm_smmu_flush_pgtable(smmu, start, sizeof(*pte) * (pte - start));
- return 0;
-}
-
-static int arm_smmu_alloc_init_pmd(struct arm_smmu_device *smmu, pud_t *pud,
- unsigned long addr, unsigned long end,
- phys_addr_t phys, int prot, int stage)
+static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot)
{
int ret;
- pmd_t *pmd;
- unsigned long next, pfn = __phys_to_pfn(phys);
-
-#ifndef __PAGETABLE_PMD_FOLDED
- if (pud_none(*pud)) {
- pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC);
- if (!pmd)
- return -ENOMEM;
-
- arm_smmu_flush_pgtable(smmu, pmd, PAGE_SIZE);
- pud_populate(NULL, pud, pmd);
- arm_smmu_flush_pgtable(smmu, pud, sizeof(*pud));
-
- pmd += pmd_index(addr);
- } else
-#endif
- pmd = pmd_offset(pud, addr);
+ unsigned long flags;
+ struct arm_smmu_domain *smmu_domain = domain->priv;
+ struct io_pgtable_ops *ops= smmu_domain->pgtbl_ops;
- do {
- next = pmd_addr_end(addr, end);
- ret = arm_smmu_alloc_init_pte(smmu, pmd, addr, next, pfn,
- prot, stage);
- phys += next - addr;
- pfn = __phys_to_pfn(phys);
- } while (pmd++, addr = next, addr < end);
+ if (!ops)
+ return -ENODEV;
+ spin_lock_irqsave(&smmu_domain->pgtbl_lock, flags);
+ ret = ops->map(ops, iova, paddr, size, prot);
+ spin_unlock_irqrestore(&smmu_domain->pgtbl_lock, flags);
return ret;
}
-static int arm_smmu_alloc_init_pud(struct arm_smmu_device *smmu, pgd_t *pgd,
- unsigned long addr, unsigned long end,
- phys_addr_t phys, int prot, int stage)
+static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
{
- int ret = 0;
- pud_t *pud;
- unsigned long next;
-
-#ifndef __PAGETABLE_PUD_FOLDED
- if (pgd_none(*pgd)) {
- pud = (pud_t *)get_zeroed_page(GFP_ATOMIC);
- if (!pud)
- return -ENOMEM;
-
- arm_smmu_flush_pgtable(smmu, pud, PAGE_SIZE);
- pgd_populate(NULL, pgd, pud);
- arm_smmu_flush_pgtable(smmu, pgd, sizeof(*pgd));
-
- pud += pud_index(addr);
- } else
-#endif
- pud = pud_offset(pgd, addr);
+ size_t ret;
+ unsigned long flags;
+ struct arm_smmu_domain *smmu_domain = domain->priv;
+ struct io_pgtable_ops *ops= smmu_domain->pgtbl_ops;
- do {
- next = pud_addr_end(addr, end);
- ret = arm_smmu_alloc_init_pmd(smmu, pud, addr, next, phys,
- prot, stage);
- phys += next - addr;
- } while (pud++, addr = next, addr < end);
+ if (!ops)
+ return 0;
+ spin_lock_irqsave(&smmu_domain->pgtbl_lock, flags);
+ ret = ops->unmap(ops, iova, size);
+ spin_unlock_irqrestore(&smmu_domain->pgtbl_lock, flags);
return ret;
}
-static int arm_smmu_handle_mapping(struct arm_smmu_domain *smmu_domain,
- unsigned long iova, phys_addr_t paddr,
- size_t size, int prot)
+static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
+ dma_addr_t iova)
{
- int ret, stage;
- unsigned long end;
- phys_addr_t input_mask, output_mask;
+ struct arm_smmu_domain *smmu_domain = domain->priv;
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
- pgd_t *pgd = cfg->pgd;
- unsigned long flags;
+ struct io_pgtable_ops *ops= smmu_domain->pgtbl_ops;
+ struct device *dev = smmu->dev;
+ void __iomem *cb_base;
+ u32 tmp;
+ u64 phys;
- if (cfg->cbar == CBAR_TYPE_S2_TRANS) {
- stage = 2;
- input_mask = (1ULL << smmu->s2_input_size) - 1;
- output_mask = (1ULL << smmu->s2_output_size) - 1;
+ cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+
+ if (smmu->version == 1) {
+ u32 reg = iova & ~0xfff;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_ATS1PR_LO);
} else {
- stage = 1;
- input_mask = (1ULL << smmu->s1_input_size) - 1;
- output_mask = (1ULL << smmu->s1_output_size) - 1;
+ u32 reg = iova & ~0xfff;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_ATS1PR_LO);
+ reg = (iova & ~0xfff) >> 32;
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_ATS1PR_HI);
}
- if (!pgd)
- return -EINVAL;
-
- if (size & ~PAGE_MASK)
- return -EINVAL;
-
- if ((phys_addr_t)iova & ~input_mask)
- return -ERANGE;
-
- if (paddr & ~output_mask)
- return -ERANGE;
-
- spin_lock_irqsave(&smmu_domain->lock, flags);
- pgd += pgd_index(iova);
- end = iova + size;
- do {
- unsigned long next = pgd_addr_end(iova, end);
-
- ret = arm_smmu_alloc_init_pud(smmu, pgd, iova, next, paddr,
- prot, stage);
- if (ret)
- goto out_unlock;
-
- paddr += next - iova;
- iova = next;
- } while (pgd++, iova != end);
-
-out_unlock:
- spin_unlock_irqrestore(&smmu_domain->lock, flags);
-
- return ret;
-}
-
-static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
- phys_addr_t paddr, size_t size, int prot)
-{
- struct arm_smmu_domain *smmu_domain = domain->priv;
-
- if (!smmu_domain)
- return -ENODEV;
+ if (readl_poll_timeout_atomic(cb_base + ARM_SMMU_CB_ATSR, tmp,
+ !(tmp & ATSR_ACTIVE), 5, 50)) {
+ dev_err(dev,
+ "iova to phys timed out on 0x%pad. Falling back to software table walk.\n",
+ &iova);
+ return ops->iova_to_phys(ops, iova);
+ }
- return arm_smmu_handle_mapping(smmu_domain, iova, paddr, size, prot);
-}
+ phys = readl_relaxed(cb_base + ARM_SMMU_CB_PAR_LO);
+ phys |= ((u64)readl_relaxed(cb_base + ARM_SMMU_CB_PAR_HI)) << 32;
-static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
- size_t size)
-{
- int ret;
- struct arm_smmu_domain *smmu_domain = domain->priv;
+ if (phys & CB_PAR_F) {
+ dev_err(dev, "translation fault!\n");
+ dev_err(dev, "PAR = 0x%llx\n", phys);
+ return 0;
+ }
- ret = arm_smmu_handle_mapping(smmu_domain, iova, 0, size, 0);
- arm_smmu_tlb_inv_context(smmu_domain);
- return ret ? 0 : size;
+ return (phys & GENMASK_ULL(39, 12)) | (iova & 0xfff);
}
static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
- dma_addr_t iova)
+ dma_addr_t iova)
{
- pgd_t *pgdp, pgd;
- pud_t pud;
- pmd_t pmd;
- pte_t pte;
+ phys_addr_t ret;
+ unsigned long flags;
struct arm_smmu_domain *smmu_domain = domain->priv;
- struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
+ struct io_pgtable_ops *ops= smmu_domain->pgtbl_ops;
- pgdp = cfg->pgd;
- if (!pgdp)
+ if (!ops)
return 0;
- pgd = *(pgdp + pgd_index(iova));
- if (pgd_none(pgd))
- return 0;
-
- pud = *pud_offset(&pgd, iova);
- if (pud_none(pud))
- return 0;
-
- pmd = *pmd_offset(&pud, iova);
- if (pmd_none(pmd))
- return 0;
+ spin_lock_irqsave(&smmu_domain->pgtbl_lock, flags);
+ if (smmu_domain->smmu->features & ARM_SMMU_FEAT_TRANS_OPS)
+ ret = arm_smmu_iova_to_phys_hard(domain, iova);
+ else
+ ret = ops->iova_to_phys(ops, iova);
+ spin_unlock_irqrestore(&smmu_domain->pgtbl_lock, flags);
- pte = *(pmd_page_vaddr(pmd) + pte_index(iova));
- if (pte_none(pte))
- return 0;
-
- return __pfn_to_phys(pte_pfn(pte)) | (iova & ~PAGE_MASK);
+ return ret;
}
static bool arm_smmu_capable(enum iommu_cap cap)
@@ -1698,24 +1403,34 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
+ int ret = 0;
struct arm_smmu_domain *smmu_domain = domain->priv;
+ mutex_lock(&smmu_domain->init_mutex);
+
switch (attr) {
case DOMAIN_ATTR_NESTING:
- if (smmu_domain->smmu)
- return -EPERM;
+ if (smmu_domain->smmu) {
+ ret = -EPERM;
+ goto out_unlock;
+ }
+
if (*(int *)data)
smmu_domain->stage = ARM_SMMU_DOMAIN_NESTED;
else
smmu_domain->stage = ARM_SMMU_DOMAIN_S1;
- return 0;
+ break;
default:
- return -ENODEV;
+ ret = -ENODEV;
}
+
+out_unlock:
+ mutex_unlock(&smmu_domain->init_mutex);
+ return ret;
}
-static const struct iommu_ops arm_smmu_ops = {
+static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_init = arm_smmu_domain_init,
.domain_destroy = arm_smmu_domain_destroy,
@@ -1729,9 +1444,7 @@ static const struct iommu_ops arm_smmu_ops = {
.remove_device = arm_smmu_remove_device,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
- .pgsize_bitmap = (SECTION_SIZE |
- ARM_SMMU_PTE_CONT_SIZE |
- PAGE_SIZE),
+ .pgsize_bitmap = -1UL, /* Restricted during device attach */
};
static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
@@ -1760,7 +1473,6 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
}
/* Invalidate the TLB, just in case */
- writel_relaxed(0, gr0_base + ARM_SMMU_GR0_STLBIALL);
writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLH);
writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH);
@@ -1782,7 +1494,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
reg &= ~(sCR0_BSU_MASK << sCR0_BSU_SHIFT);
/* Push the button */
- arm_smmu_tlb_sync(smmu);
+ __arm_smmu_tlb_sync(smmu);
writel(reg, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
}
@@ -1816,12 +1528,6 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
/* ID0 */
id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID0);
-#ifndef CONFIG_64BIT
- if (((id >> ID0_PTFS_SHIFT) & ID0_PTFS_MASK) == ID0_PTFS_V8_ONLY) {
- dev_err(smmu->dev, "\tno v7 descriptor support!\n");
- return -ENODEV;
- }
-#endif
/* Restrict available stages based on module parameter */
if (force_stage == 1)
@@ -1850,6 +1556,11 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
return -ENODEV;
}
+ if (smmu->version == 1 || (!(id & ID0_ATOSNS) && (id & ID0_S1TS))) {
+ smmu->features |= ARM_SMMU_FEAT_TRANS_OPS;
+ dev_notice(smmu->dev, "\taddress translation ops\n");
+ }
+
if (id & ID0_CTTW) {
smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK;
dev_notice(smmu->dev, "\tcoherent table walk\n");
@@ -1894,16 +1605,14 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
smmu->pgshift = (id & ID1_PAGESIZE) ? 16 : 12;
/* Check for size mismatch of SMMU address space from mapped region */
- size = 1 <<
- (((id >> ID1_NUMPAGENDXB_SHIFT) & ID1_NUMPAGENDXB_MASK) + 1);
+ size = 1 << (((id >> ID1_NUMPAGENDXB_SHIFT) & ID1_NUMPAGENDXB_MASK) + 1);
size *= 2 << smmu->pgshift;
if (smmu->size != size)
dev_warn(smmu->dev,
"SMMU address space size (0x%lx) differs from mapped region size (0x%lx)!\n",
size, smmu->size);
- smmu->num_s2_context_banks = (id >> ID1_NUMS2CB_SHIFT) &
- ID1_NUMS2CB_MASK;
+ smmu->num_s2_context_banks = (id >> ID1_NUMS2CB_SHIFT) & ID1_NUMS2CB_MASK;
smmu->num_context_banks = (id >> ID1_NUMCB_SHIFT) & ID1_NUMCB_MASK;
if (smmu->num_s2_context_banks > smmu->num_context_banks) {
dev_err(smmu->dev, "impossible number of S2 context banks!\n");
@@ -1915,46 +1624,40 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
/* ID2 */
id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID2);
size = arm_smmu_id_size_to_bits((id >> ID2_IAS_SHIFT) & ID2_IAS_MASK);
- smmu->s1_output_size = min_t(unsigned long, PHYS_MASK_SHIFT, size);
-
- /* Stage-2 input size limited due to pgd allocation (PTRS_PER_PGD) */
-#ifdef CONFIG_64BIT
- smmu->s2_input_size = min_t(unsigned long, VA_BITS, size);
-#else
- smmu->s2_input_size = min(32UL, size);
-#endif
+ smmu->ipa_size = size;
- /* The stage-2 output mask is also applied for bypass */
+ /* The output mask is also applied for bypass */
size = arm_smmu_id_size_to_bits((id >> ID2_OAS_SHIFT) & ID2_OAS_MASK);
- smmu->s2_output_size = min_t(unsigned long, PHYS_MASK_SHIFT, size);
+ smmu->pa_size = size;
if (smmu->version == ARM_SMMU_V1) {
- smmu->s1_input_size = 32;
+ smmu->va_size = smmu->ipa_size;
+ size = SZ_4K | SZ_2M | SZ_1G;
} else {
-#ifdef CONFIG_64BIT
size = (id >> ID2_UBS_SHIFT) & ID2_UBS_MASK;
- size = min(VA_BITS, arm_smmu_id_size_to_bits(size));
-#else
- size = 32;
+ smmu->va_size = arm_smmu_id_size_to_bits(size);
+#ifndef CONFIG_64BIT
+ smmu->va_size = min(32UL, smmu->va_size);
#endif
- smmu->s1_input_size = size;
-
- if ((PAGE_SIZE == SZ_4K && !(id & ID2_PTFS_4K)) ||
- (PAGE_SIZE == SZ_64K && !(id & ID2_PTFS_64K)) ||
- (PAGE_SIZE != SZ_4K && PAGE_SIZE != SZ_64K)) {
- dev_err(smmu->dev, "CPU page size 0x%lx unsupported\n",
- PAGE_SIZE);
- return -ENODEV;
- }
+ size = 0;
+ if (id & ID2_PTFS_4K)
+ size |= SZ_4K | SZ_2M | SZ_1G;
+ if (id & ID2_PTFS_16K)
+ size |= SZ_16K | SZ_32M;
+ if (id & ID2_PTFS_64K)
+ size |= SZ_64K | SZ_512M;
}
+ arm_smmu_ops.pgsize_bitmap &= size;
+ dev_notice(smmu->dev, "\tSupported page sizes: 0x%08lx\n", size);
+
if (smmu->features & ARM_SMMU_FEAT_TRANS_S1)
dev_notice(smmu->dev, "\tStage-1: %lu-bit VA -> %lu-bit IPA\n",
- smmu->s1_input_size, smmu->s1_output_size);
+ smmu->va_size, smmu->ipa_size);
if (smmu->features & ARM_SMMU_FEAT_TRANS_S2)
dev_notice(smmu->dev, "\tStage-2: %lu-bit IPA -> %lu-bit PA\n",
- smmu->s2_input_size, smmu->s2_output_size);
+ smmu->ipa_size, smmu->pa_size);
return 0;
}
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
new file mode 100644
index 0000000..5a500ed
--- /dev/null
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -0,0 +1,986 @@
+/*
+ * CPU-agnostic ARM page table allocator.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt
+
+#include <linux/iommu.h>
+#include <linux/kernel.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "io-pgtable.h"
+
+#define ARM_LPAE_MAX_ADDR_BITS 48
+#define ARM_LPAE_S2_MAX_CONCAT_PAGES 16
+#define ARM_LPAE_MAX_LEVELS 4
+
+/* Struct accessors */
+#define io_pgtable_to_data(x) \
+ container_of((x), struct arm_lpae_io_pgtable, iop)
+
+#define io_pgtable_ops_to_pgtable(x) \
+ container_of((x), struct io_pgtable, ops)
+
+#define io_pgtable_ops_to_data(x) \
+ io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
+
+/*
+ * For consistency with the architecture, we always consider
+ * ARM_LPAE_MAX_LEVELS levels, with the walk starting at level n >=0
+ */
+#define ARM_LPAE_START_LVL(d) (ARM_LPAE_MAX_LEVELS - (d)->levels)
+
+/*
+ * Calculate the right shift amount to get to the portion describing level l
+ * in a virtual address mapped by the pagetable in d.
+ */
+#define ARM_LPAE_LVL_SHIFT(l,d) \
+ ((((d)->levels - ((l) - ARM_LPAE_START_LVL(d) + 1)) \
+ * (d)->bits_per_level) + (d)->pg_shift)
+
+#define ARM_LPAE_PAGES_PER_PGD(d) ((d)->pgd_size >> (d)->pg_shift)
+
+/*
+ * Calculate the index at level l used to map virtual address a using the
+ * pagetable in d.
+ */
+#define ARM_LPAE_PGD_IDX(l,d) \
+ ((l) == ARM_LPAE_START_LVL(d) ? ilog2(ARM_LPAE_PAGES_PER_PGD(d)) : 0)
+
+#define ARM_LPAE_LVL_IDX(a,l,d) \
+ (((a) >> ARM_LPAE_LVL_SHIFT(l,d)) & \
+ ((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1))
+
+/* Calculate the block/page mapping size at level l for pagetable in d. */
+#define ARM_LPAE_BLOCK_SIZE(l,d) \
+ (1 << (ilog2(sizeof(arm_lpae_iopte)) + \
+ ((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level)))
+
+/* Page table bits */
+#define ARM_LPAE_PTE_TYPE_SHIFT 0
+#define ARM_LPAE_PTE_TYPE_MASK 0x3
+
+#define ARM_LPAE_PTE_TYPE_BLOCK 1
+#define ARM_LPAE_PTE_TYPE_TABLE 3
+#define ARM_LPAE_PTE_TYPE_PAGE 3
+
+#define ARM_LPAE_PTE_NSTABLE (((arm_lpae_iopte)1) << 63)
+#define ARM_LPAE_PTE_XN (((arm_lpae_iopte)3) << 53)
+#define ARM_LPAE_PTE_AF (((arm_lpae_iopte)1) << 10)
+#define ARM_LPAE_PTE_SH_NS (((arm_lpae_iopte)0) << 8)
+#define ARM_LPAE_PTE_SH_OS (((arm_lpae_iopte)2) << 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)
+
+#define ARM_LPAE_PTE_ATTR_LO_MASK (((arm_lpae_iopte)0x3ff) << 2)
+/* Ignore the contiguous bit for block splitting */
+#define ARM_LPAE_PTE_ATTR_HI_MASK (((arm_lpae_iopte)6) << 52)
+#define ARM_LPAE_PTE_ATTR_MASK (ARM_LPAE_PTE_ATTR_LO_MASK | \
+ ARM_LPAE_PTE_ATTR_HI_MASK)
+
+/* Stage-1 PTE */
+#define ARM_LPAE_PTE_AP_UNPRIV (((arm_lpae_iopte)1) << 6)
+#define ARM_LPAE_PTE_AP_RDONLY (((arm_lpae_iopte)2) << 6)
+#define ARM_LPAE_PTE_ATTRINDX_SHIFT 2
+#define ARM_LPAE_PTE_nG (((arm_lpae_iopte)1) << 11)
+
+/* Stage-2 PTE */
+#define ARM_LPAE_PTE_HAP_FAULT (((arm_lpae_iopte)0) << 6)
+#define ARM_LPAE_PTE_HAP_READ (((arm_lpae_iopte)1) << 6)
+#define ARM_LPAE_PTE_HAP_WRITE (((arm_lpae_iopte)2) << 6)
+#define ARM_LPAE_PTE_MEMATTR_OIWB (((arm_lpae_iopte)0xf) << 2)
+#define ARM_LPAE_PTE_MEMATTR_NC (((arm_lpae_iopte)0x5) << 2)
+#define ARM_LPAE_PTE_MEMATTR_DEV (((arm_lpae_iopte)0x1) << 2)
+
+/* Register bits */
+#define ARM_32_LPAE_TCR_EAE (1 << 31)
+#define ARM_64_LPAE_S2_TCR_RES1 (1 << 31)
+
+#define ARM_LPAE_TCR_TG0_4K (0 << 14)
+#define ARM_LPAE_TCR_TG0_64K (1 << 14)
+#define ARM_LPAE_TCR_TG0_16K (2 << 14)
+
+#define ARM_LPAE_TCR_SH0_SHIFT 12
+#define ARM_LPAE_TCR_SH0_MASK 0x3
+#define ARM_LPAE_TCR_SH_NS 0
+#define ARM_LPAE_TCR_SH_OS 2
+#define ARM_LPAE_TCR_SH_IS 3
+
+#define ARM_LPAE_TCR_ORGN0_SHIFT 10
+#define ARM_LPAE_TCR_IRGN0_SHIFT 8
+#define ARM_LPAE_TCR_RGN_MASK 0x3
+#define ARM_LPAE_TCR_RGN_NC 0
+#define ARM_LPAE_TCR_RGN_WBWA 1
+#define ARM_LPAE_TCR_RGN_WT 2
+#define ARM_LPAE_TCR_RGN_WB 3
+
+#define ARM_LPAE_TCR_SL0_SHIFT 6
+#define ARM_LPAE_TCR_SL0_MASK 0x3
+
+#define ARM_LPAE_TCR_T0SZ_SHIFT 0
+#define ARM_LPAE_TCR_SZ_MASK 0xf
+
+#define ARM_LPAE_TCR_PS_SHIFT 16
+#define ARM_LPAE_TCR_PS_MASK 0x7
+
+#define ARM_LPAE_TCR_IPS_SHIFT 32
+#define ARM_LPAE_TCR_IPS_MASK 0x7
+
+#define ARM_LPAE_TCR_PS_32_BIT 0x0ULL
+#define ARM_LPAE_TCR_PS_36_BIT 0x1ULL
+#define ARM_LPAE_TCR_PS_40_BIT 0x2ULL
+#define ARM_LPAE_TCR_PS_42_BIT 0x3ULL
+#define ARM_LPAE_TCR_PS_44_BIT 0x4ULL
+#define ARM_LPAE_TCR_PS_48_BIT 0x5ULL
+
+#define ARM_LPAE_MAIR_ATTR_SHIFT(n) ((n) << 3)
+#define ARM_LPAE_MAIR_ATTR_MASK 0xff
+#define ARM_LPAE_MAIR_ATTR_DEVICE 0x04
+#define ARM_LPAE_MAIR_ATTR_NC 0x44
+#define ARM_LPAE_MAIR_ATTR_WBRWA 0xff
+#define ARM_LPAE_MAIR_ATTR_IDX_NC 0
+#define ARM_LPAE_MAIR_ATTR_IDX_CACHE 1
+#define ARM_LPAE_MAIR_ATTR_IDX_DEV 2
+
+/* IOPTE accessors */
+#define iopte_deref(pte,d) \
+ (__va((pte) & ((1ULL << ARM_LPAE_MAX_ADDR_BITS) - 1) \
+ & ~((1ULL << (d)->pg_shift) - 1)))
+
+#define iopte_type(pte,l) \
+ (((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
+
+#define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK)
+
+#define iopte_leaf(pte,l) \
+ (l == (ARM_LPAE_MAX_LEVELS - 1) ? \
+ (iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_PAGE) : \
+ (iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_BLOCK))
+
+#define iopte_to_pfn(pte,d) \
+ (((pte) & ((1ULL << ARM_LPAE_MAX_ADDR_BITS) - 1)) >> (d)->pg_shift)
+
+#define pfn_to_iopte(pfn,d) \
+ (((pfn) << (d)->pg_shift) & ((1ULL << ARM_LPAE_MAX_ADDR_BITS) - 1))
+
+struct arm_lpae_io_pgtable {
+ struct io_pgtable iop;
+
+ int levels;
+ size_t pgd_size;
+ unsigned long pg_shift;
+ unsigned long bits_per_level;
+
+ void *pgd;
+};
+
+typedef u64 arm_lpae_iopte;
+
+static bool selftest_running = false;
+
+static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
+ unsigned long iova, phys_addr_t paddr,
+ arm_lpae_iopte prot, int lvl,
+ arm_lpae_iopte *ptep)
+{
+ arm_lpae_iopte pte = prot;
+
+ /* We require an unmap first */
+ if (iopte_leaf(*ptep, lvl)) {
+ WARN_ON(!selftest_running);
+ return -EEXIST;
+ }
+
+ if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
+ pte |= ARM_LPAE_PTE_NS;
+
+ if (lvl == ARM_LPAE_MAX_LEVELS - 1)
+ pte |= ARM_LPAE_PTE_TYPE_PAGE;
+ else
+ pte |= ARM_LPAE_PTE_TYPE_BLOCK;
+
+ pte |= ARM_LPAE_PTE_AF | ARM_LPAE_PTE_SH_IS;
+ pte |= pfn_to_iopte(paddr >> data->pg_shift, data);
+
+ *ptep = pte;
+ data->iop.cfg.tlb->flush_pgtable(ptep, sizeof(*ptep), data->iop.cookie);
+ return 0;
+}
+
+static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
+ phys_addr_t paddr, size_t size, arm_lpae_iopte prot,
+ int lvl, arm_lpae_iopte *ptep)
+{
+ arm_lpae_iopte *cptep, pte;
+ void *cookie = data->iop.cookie;
+ size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
+
+ /* Find our entry at the current level */
+ ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
+
+ /* If we can install a leaf entry at this level, then do so */
+ if (size == block_size && (size & data->iop.cfg.pgsize_bitmap))
+ return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep);
+
+ /* We can't allocate tables at the final level */
+ if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
+ return -EINVAL;
+
+ /* Grab a pointer to the next level */
+ pte = *ptep;
+ if (!pte) {
+ cptep = alloc_pages_exact(1UL << data->pg_shift,
+ GFP_ATOMIC | __GFP_ZERO);
+ if (!cptep)
+ return -ENOMEM;
+
+ data->iop.cfg.tlb->flush_pgtable(cptep, 1UL << data->pg_shift,
+ cookie);
+ pte = __pa(cptep) | ARM_LPAE_PTE_TYPE_TABLE;
+ if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
+ pte |= ARM_LPAE_PTE_NSTABLE;
+ *ptep = pte;
+ data->iop.cfg.tlb->flush_pgtable(ptep, sizeof(*ptep), cookie);
+ } else {
+ cptep = iopte_deref(pte, data);
+ }
+
+ /* Rinse, repeat */
+ return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep);
+}
+
+static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
+ int prot)
+{
+ arm_lpae_iopte pte;
+
+ if (data->iop.fmt == ARM_64_LPAE_S1 ||
+ data->iop.fmt == ARM_32_LPAE_S1) {
+ pte = ARM_LPAE_PTE_AP_UNPRIV | ARM_LPAE_PTE_nG;
+
+ if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
+ pte |= ARM_LPAE_PTE_AP_RDONLY;
+
+ if (prot & IOMMU_CACHE)
+ pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
+ << ARM_LPAE_PTE_ATTRINDX_SHIFT);
+ } else {
+ pte = ARM_LPAE_PTE_HAP_FAULT;
+ if (prot & IOMMU_READ)
+ pte |= ARM_LPAE_PTE_HAP_READ;
+ if (prot & IOMMU_WRITE)
+ pte |= ARM_LPAE_PTE_HAP_WRITE;
+ if (prot & IOMMU_CACHE)
+ pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
+ else
+ pte |= ARM_LPAE_PTE_MEMATTR_NC;
+ }
+
+ if (prot & IOMMU_NOEXEC)
+ pte |= ARM_LPAE_PTE_XN;
+
+ 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)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ arm_lpae_iopte *ptep = data->pgd;
+ int lvl = ARM_LPAE_START_LVL(data);
+ arm_lpae_iopte prot;
+
+ /* If no access, then nothing to do */
+ if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
+ return 0;
+
+ prot = arm_lpae_prot_to_pte(data, iommu_prot);
+ return __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep);
+}
+
+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;
+
+ /* Only leaf entries at the last level */
+ if (lvl == ARM_LPAE_MAX_LEVELS - 1)
+ return;
+
+ if (lvl == ARM_LPAE_START_LVL(data))
+ table_size = data->pgd_size;
+ else
+ table_size = 1UL << data->pg_shift;
+
+ start = ptep;
+ end = (void *)ptep + table_size;
+
+ while (ptep != end) {
+ arm_lpae_iopte pte = *ptep++;
+
+ if (!pte || iopte_leaf(pte, lvl))
+ continue;
+
+ __arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
+ }
+
+ free_pages_exact(start, table_size);
+}
+
+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);
+ kfree(data);
+}
+
+static int arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
+ unsigned long iova, size_t size,
+ arm_lpae_iopte prot, int lvl,
+ arm_lpae_iopte *ptep, size_t blk_size)
+{
+ unsigned long blk_start, blk_end;
+ phys_addr_t blk_paddr;
+ arm_lpae_iopte table = 0;
+ void *cookie = data->iop.cookie;
+ const struct iommu_gather_ops *tlb = data->iop.cfg.tlb;
+
+ blk_start = iova & ~(blk_size - 1);
+ blk_end = blk_start + blk_size;
+ blk_paddr = iopte_to_pfn(*ptep, data) << data->pg_shift;
+
+ for (; blk_start < blk_end; blk_start += size, blk_paddr += size) {
+ arm_lpae_iopte *tablep;
+
+ /* Unmap! */
+ if (blk_start == iova)
+ continue;
+
+ /* __arm_lpae_map expects a pointer to the start of the table */
+ tablep = &table - ARM_LPAE_LVL_IDX(blk_start, lvl, data);
+ if (__arm_lpae_map(data, blk_start, blk_paddr, size, prot, lvl,
+ tablep) < 0) {
+ if (table) {
+ /* Free the table we allocated */
+ tablep = iopte_deref(table, data);
+ __arm_lpae_free_pgtable(data, lvl + 1, tablep);
+ }
+ return 0; /* Bytes unmapped */
+ }
+ }
+
+ *ptep = table;
+ tlb->flush_pgtable(ptep, sizeof(*ptep), cookie);
+ iova &= ~(blk_size - 1);
+ tlb->tlb_add_flush(iova, blk_size, true, cookie);
+ return size;
+}
+
+static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
+ unsigned long iova, size_t size, int lvl,
+ arm_lpae_iopte *ptep)
+{
+ arm_lpae_iopte pte;
+ const struct iommu_gather_ops *tlb = data->iop.cfg.tlb;
+ void *cookie = data->iop.cookie;
+ size_t blk_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
+
+ ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
+ pte = *ptep;
+
+ /* Something went horribly wrong and we ran out of page table */
+ if (WARN_ON(!pte || (lvl == ARM_LPAE_MAX_LEVELS)))
+ return 0;
+
+ /* If the size matches this level, we're in the right place */
+ if (size == blk_size) {
+ *ptep = 0;
+ tlb->flush_pgtable(ptep, sizeof(*ptep), cookie);
+
+ if (!iopte_leaf(pte, lvl)) {
+ /* Also flush any partial walks */
+ tlb->tlb_add_flush(iova, size, false, cookie);
+ tlb->tlb_sync(data->iop.cookie);
+ ptep = iopte_deref(pte, data);
+ __arm_lpae_free_pgtable(data, lvl + 1, ptep);
+ } else {
+ tlb->tlb_add_flush(iova, size, true, cookie);
+ }
+
+ return size;
+ } else if (iopte_leaf(pte, lvl)) {
+ /*
+ * Insert a table at the next level to map the old region,
+ * minus the part we want to unmap
+ */
+ return arm_lpae_split_blk_unmap(data, iova, size,
+ iopte_prot(pte), lvl, ptep,
+ blk_size);
+ }
+
+ /* Keep on walkin' */
+ ptep = iopte_deref(pte, data);
+ return __arm_lpae_unmap(data, iova, size, lvl + 1, ptep);
+}
+
+static int arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
+ size_t size)
+{
+ size_t unmapped;
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable *iop = &data->iop;
+ arm_lpae_iopte *ptep = data->pgd;
+ int lvl = ARM_LPAE_START_LVL(data);
+
+ unmapped = __arm_lpae_unmap(data, iova, size, lvl, ptep);
+ if (unmapped)
+ iop->cfg.tlb->tlb_sync(iop->cookie);
+
+ return unmapped;
+}
+
+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);
+ arm_lpae_iopte pte, *ptep = data->pgd;
+ int lvl = ARM_LPAE_START_LVL(data);
+
+ do {
+ /* Valid IOPTE pointer? */
+ if (!ptep)
+ return 0;
+
+ /* Grab the IOPTE we're interested in */
+ pte = *(ptep + ARM_LPAE_LVL_IDX(iova, lvl, data));
+
+ /* Valid entry? */
+ if (!pte)
+ return 0;
+
+ /* Leaf entry? */
+ if (iopte_leaf(pte,lvl))
+ goto found_translation;
+
+ /* Take it to the next level */
+ ptep = iopte_deref(pte, data);
+ } while (++lvl < ARM_LPAE_MAX_LEVELS);
+
+ /* Ran out of page tables to walk */
+ return 0;
+
+found_translation:
+ iova &= ((1 << data->pg_shift) - 1);
+ return ((phys_addr_t)iopte_to_pfn(pte,data) << data->pg_shift) | iova;
+}
+
+static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
+{
+ unsigned long granule;
+
+ /*
+ * We need to restrict the supported page sizes to match the
+ * translation regime for a particular granule. Aim to match
+ * the CPU page size if possible, otherwise prefer smaller sizes.
+ * While we're at it, restrict the block sizes to match the
+ * chosen granule.
+ */
+ if (cfg->pgsize_bitmap & PAGE_SIZE)
+ granule = PAGE_SIZE;
+ else if (cfg->pgsize_bitmap & ~PAGE_MASK)
+ granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK);
+ else if (cfg->pgsize_bitmap & PAGE_MASK)
+ granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK);
+ else
+ granule = 0;
+
+ switch (granule) {
+ case SZ_4K:
+ cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
+ break;
+ case SZ_16K:
+ cfg->pgsize_bitmap &= (SZ_16K | SZ_32M);
+ break;
+ case SZ_64K:
+ cfg->pgsize_bitmap &= (SZ_64K | SZ_512M);
+ break;
+ default:
+ cfg->pgsize_bitmap = 0;
+ }
+}
+
+static struct arm_lpae_io_pgtable *
+arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
+{
+ unsigned long va_bits, pgd_bits;
+ struct arm_lpae_io_pgtable *data;
+
+ arm_lpae_restrict_pgsizes(cfg);
+
+ if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
+ return NULL;
+
+ if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
+ return NULL;
+
+ if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
+ return NULL;
+
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+
+ data->pg_shift = __ffs(cfg->pgsize_bitmap);
+ data->bits_per_level = data->pg_shift - ilog2(sizeof(arm_lpae_iopte));
+
+ va_bits = cfg->ias - data->pg_shift;
+ data->levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
+
+ /* Calculate the actual size of our pgd (without concatenation) */
+ pgd_bits = va_bits - (data->bits_per_level * (data->levels - 1));
+ data->pgd_size = 1UL << (pgd_bits + ilog2(sizeof(arm_lpae_iopte)));
+
+ data->iop.ops = (struct io_pgtable_ops) {
+ .map = arm_lpae_map,
+ .unmap = arm_lpae_unmap,
+ .iova_to_phys = arm_lpae_iova_to_phys,
+ };
+
+ return data;
+}
+
+static struct io_pgtable *
+arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ u64 reg;
+ struct arm_lpae_io_pgtable *data = arm_lpae_alloc_pgtable(cfg);
+
+ if (!data)
+ return NULL;
+
+ /* TCR */
+ reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
+
+ switch (1 << data->pg_shift) {
+ case SZ_4K:
+ reg |= ARM_LPAE_TCR_TG0_4K;
+ break;
+ case SZ_16K:
+ reg |= ARM_LPAE_TCR_TG0_16K;
+ break;
+ case SZ_64K:
+ reg |= ARM_LPAE_TCR_TG0_64K;
+ break;
+ }
+
+ switch (cfg->oas) {
+ case 32:
+ reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_IPS_SHIFT);
+ break;
+ case 36:
+ reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_IPS_SHIFT);
+ break;
+ case 40:
+ reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_IPS_SHIFT);
+ break;
+ case 42:
+ reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_IPS_SHIFT);
+ break;
+ case 44:
+ reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_IPS_SHIFT);
+ break;
+ case 48:
+ reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_IPS_SHIFT);
+ break;
+ default:
+ goto out_free_data;
+ }
+
+ reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
+ cfg->arm_lpae_s1_cfg.tcr = reg;
+
+ /* MAIRs */
+ reg = (ARM_LPAE_MAIR_ATTR_NC
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
+ (ARM_LPAE_MAIR_ATTR_WBRWA
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
+ (ARM_LPAE_MAIR_ATTR_DEVICE
+ << ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV));
+
+ cfg->arm_lpae_s1_cfg.mair[0] = reg;
+ cfg->arm_lpae_s1_cfg.mair[1] = 0;
+
+ /* Looking good; allocate a pgd */
+ data->pgd = alloc_pages_exact(data->pgd_size, GFP_KERNEL | __GFP_ZERO);
+ if (!data->pgd)
+ goto out_free_data;
+
+ cfg->tlb->flush_pgtable(data->pgd, data->pgd_size, cookie);
+
+ /* TTBRs */
+ cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd);
+ cfg->arm_lpae_s1_cfg.ttbr[1] = 0;
+ return &data->iop;
+
+out_free_data:
+ kfree(data);
+ return NULL;
+}
+
+static struct io_pgtable *
+arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ u64 reg, sl;
+ struct arm_lpae_io_pgtable *data = arm_lpae_alloc_pgtable(cfg);
+
+ if (!data)
+ return NULL;
+
+ /*
+ * Concatenate PGDs at level 1 if possible in order to reduce
+ * the depth of the stage-2 walk.
+ */
+ if (data->levels == ARM_LPAE_MAX_LEVELS) {
+ unsigned long pgd_pages;
+
+ pgd_pages = data->pgd_size >> ilog2(sizeof(arm_lpae_iopte));
+ if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) {
+ data->pgd_size = pgd_pages << data->pg_shift;
+ data->levels--;
+ }
+ }
+
+ /* VTCR */
+ reg = ARM_64_LPAE_S2_TCR_RES1 |
+ (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
+
+ sl = ARM_LPAE_START_LVL(data);
+
+ switch (1 << data->pg_shift) {
+ case SZ_4K:
+ reg |= ARM_LPAE_TCR_TG0_4K;
+ sl++; /* SL0 format is different for 4K granule size */
+ break;
+ case SZ_16K:
+ reg |= ARM_LPAE_TCR_TG0_16K;
+ break;
+ case SZ_64K:
+ reg |= ARM_LPAE_TCR_TG0_64K;
+ break;
+ }
+
+ switch (cfg->oas) {
+ case 32:
+ reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_PS_SHIFT);
+ break;
+ case 36:
+ reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_PS_SHIFT);
+ break;
+ case 40:
+ reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_PS_SHIFT);
+ break;
+ case 42:
+ reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_PS_SHIFT);
+ break;
+ case 44:
+ reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_PS_SHIFT);
+ break;
+ case 48:
+ reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_PS_SHIFT);
+ break;
+ default:
+ goto out_free_data;
+ }
+
+ reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
+ reg |= (~sl & ARM_LPAE_TCR_SL0_MASK) << ARM_LPAE_TCR_SL0_SHIFT;
+ cfg->arm_lpae_s2_cfg.vtcr = reg;
+
+ /* Allocate pgd pages */
+ data->pgd = alloc_pages_exact(data->pgd_size, GFP_KERNEL | __GFP_ZERO);
+ if (!data->pgd)
+ goto out_free_data;
+
+ cfg->tlb->flush_pgtable(data->pgd, data->pgd_size, cookie);
+
+ /* VTTBR */
+ cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
+ return &data->iop;
+
+out_free_data:
+ kfree(data);
+ return NULL;
+}
+
+static struct io_pgtable *
+arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ struct io_pgtable *iop;
+
+ if (cfg->ias > 32 || cfg->oas > 40)
+ return NULL;
+
+ cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
+ iop = arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
+ if (iop) {
+ cfg->arm_lpae_s1_cfg.tcr |= ARM_32_LPAE_TCR_EAE;
+ cfg->arm_lpae_s1_cfg.tcr &= 0xffffffff;
+ }
+
+ return iop;
+}
+
+static struct io_pgtable *
+arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
+{
+ struct io_pgtable *iop;
+
+ if (cfg->ias > 40 || cfg->oas > 40)
+ return NULL;
+
+ cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
+ iop = arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
+ if (iop)
+ cfg->arm_lpae_s2_cfg.vtcr &= 0xffffffff;
+
+ return iop;
+}
+
+struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
+ .alloc = arm_64_lpae_alloc_pgtable_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,
+};
+
+struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = {
+ .alloc = arm_32_lpae_alloc_pgtable_s1,
+ .free = arm_lpae_free_pgtable,
+};
+
+struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = {
+ .alloc = arm_32_lpae_alloc_pgtable_s2,
+ .free = arm_lpae_free_pgtable,
+};
+
+#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
+
+static struct io_pgtable_cfg *cfg_cookie;
+
+static void dummy_tlb_flush_all(void *cookie)
+{
+ WARN_ON(cookie != cfg_cookie);
+}
+
+static void dummy_tlb_add_flush(unsigned long iova, size_t size, bool leaf,
+ void *cookie)
+{
+ WARN_ON(cookie != cfg_cookie);
+ WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
+}
+
+static void dummy_tlb_sync(void *cookie)
+{
+ WARN_ON(cookie != cfg_cookie);
+}
+
+static void dummy_flush_pgtable(void *ptr, size_t size, void *cookie)
+{
+ WARN_ON(cookie != cfg_cookie);
+}
+
+static struct iommu_gather_ops dummy_tlb_ops __initdata = {
+ .tlb_flush_all = dummy_tlb_flush_all,
+ .tlb_add_flush = dummy_tlb_add_flush,
+ .tlb_sync = dummy_tlb_sync,
+ .flush_pgtable = dummy_flush_pgtable,
+};
+
+static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;
+
+ 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",
+ data->levels, data->pgd_size, data->pg_shift,
+ data->bits_per_level, data->pgd);
+}
+
+#define __FAIL(ops, i) ({ \
+ WARN(1, "selftest: test failed for fmt idx %d\n", (i)); \
+ arm_lpae_dump_ops(ops); \
+ selftest_running = false; \
+ -EFAULT; \
+})
+
+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,
+ };
+
+ int i, j;
+ unsigned long iova;
+ size_t size;
+ struct io_pgtable_ops *ops;
+
+ selftest_running = true;
+
+ for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
+ cfg_cookie = cfg;
+ ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
+ if (!ops) {
+ pr_err("selftest: failed to allocate io pgtable ops\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Initial sanity checks.
+ * Empty page tables shouldn't provide any translations.
+ */
+ if (ops->iova_to_phys(ops, 42))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, SZ_1G + 42))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, SZ_2G + 42))
+ return __FAIL(ops, i);
+
+ /*
+ * Distinct mappings of different granule sizes.
+ */
+ iova = 0;
+ j = find_first_bit(&cfg->pgsize_bitmap, BITS_PER_LONG);
+ while (j != BITS_PER_LONG) {
+ size = 1UL << j;
+
+ if (ops->map(ops, iova, iova, size, IOMMU_READ |
+ IOMMU_WRITE |
+ IOMMU_NOEXEC |
+ IOMMU_CACHE))
+ return __FAIL(ops, i);
+
+ /* Overlapping mappings */
+ if (!ops->map(ops, iova, iova + size, size,
+ IOMMU_READ | IOMMU_NOEXEC))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
+ return __FAIL(ops, i);
+
+ iova += SZ_1G;
+ j++;
+ j = find_next_bit(&cfg->pgsize_bitmap, BITS_PER_LONG, j);
+ }
+
+ /* Partial unmap */
+ size = 1UL << __ffs(cfg->pgsize_bitmap);
+ if (ops->unmap(ops, SZ_1G + size, size) != size)
+ return __FAIL(ops, i);
+
+ /* Remap of partial unmap */
+ if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42))
+ return __FAIL(ops, i);
+
+ /* Full unmap */
+ iova = 0;
+ j = find_first_bit(&cfg->pgsize_bitmap, BITS_PER_LONG);
+ while (j != BITS_PER_LONG) {
+ size = 1UL << j;
+
+ if (ops->unmap(ops, iova, size) != size)
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, iova + 42))
+ return __FAIL(ops, i);
+
+ /* Remap full block */
+ if (ops->map(ops, iova, iova, size, IOMMU_WRITE))
+ return __FAIL(ops, i);
+
+ if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
+ return __FAIL(ops, i);
+
+ iova += SZ_1G;
+ j++;
+ j = find_next_bit(&cfg->pgsize_bitmap, BITS_PER_LONG, j);
+ }
+
+ free_io_pgtable_ops(ops);
+ }
+
+ selftest_running = false;
+ return 0;
+}
+
+static int __init arm_lpae_do_selftests(void)
+{
+ static const unsigned long pgsize[] = {
+ SZ_4K | SZ_2M | SZ_1G,
+ SZ_16K | SZ_32M,
+ SZ_64K | SZ_512M,
+ };
+
+ static const unsigned int ias[] = {
+ 32, 36, 40, 42, 44, 48,
+ };
+
+ int i, j, pass = 0, fail = 0;
+ struct io_pgtable_cfg cfg = {
+ .tlb = &dummy_tlb_ops,
+ .oas = 48,
+ };
+
+ for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
+ for (j = 0; j < ARRAY_SIZE(ias); ++j) {
+ cfg.pgsize_bitmap = pgsize[i];
+ cfg.ias = ias[j];
+ pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
+ pgsize[i], ias[j]);
+ if (arm_lpae_run_tests(&cfg))
+ fail++;
+ else
+ pass++;
+ }
+ }
+
+ pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
+ return fail ? -EFAULT : 0;
+}
+subsys_initcall(arm_lpae_do_selftests);
+#endif
diff --git a/drivers/iommu/io-pgtable.c b/drivers/iommu/io-pgtable.c
new file mode 100644
index 0000000..6436fe2
--- /dev/null
+++ b/drivers/iommu/io-pgtable.c
@@ -0,0 +1,82 @@
+/*
+ * Generic page table allocator for IOMMUs.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include "io-pgtable.h"
+
+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;
+
+static const struct io_pgtable_init_fns *
+io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] =
+{
+#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE
+ [ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns,
+ [ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns,
+ [ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
+ [ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
+#endif
+};
+
+struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
+ struct io_pgtable_cfg *cfg,
+ void *cookie)
+{
+ struct io_pgtable *iop;
+ const struct io_pgtable_init_fns *fns;
+
+ if (fmt >= IO_PGTABLE_NUM_FMTS)
+ return NULL;
+
+ fns = io_pgtable_init_table[fmt];
+ if (!fns)
+ return NULL;
+
+ iop = fns->alloc(cfg, cookie);
+ if (!iop)
+ return NULL;
+
+ iop->fmt = fmt;
+ iop->cookie = cookie;
+ iop->cfg = *cfg;
+
+ return &iop->ops;
+}
+
+/*
+ * It is the IOMMU driver's responsibility to ensure that the page table
+ * is no longer accessible to the walker by this point.
+ */
+void free_io_pgtable_ops(struct io_pgtable_ops *ops)
+{
+ struct io_pgtable *iop;
+
+ if (!ops)
+ return;
+
+ iop = container_of(ops, struct io_pgtable, ops);
+ iop->cfg.tlb->tlb_flush_all(iop->cookie);
+ io_pgtable_init_table[iop->fmt]->free(iop);
+}
diff --git a/drivers/iommu/io-pgtable.h b/drivers/iommu/io-pgtable.h
new file mode 100644
index 0000000..10e32f6
--- /dev/null
+++ b/drivers/iommu/io-pgtable.h
@@ -0,0 +1,143 @@
+#ifndef __IO_PGTABLE_H
+#define __IO_PGTABLE_H
+
+/*
+ * Public API for use by IOMMU drivers
+ */
+enum io_pgtable_fmt {
+ ARM_32_LPAE_S1,
+ ARM_32_LPAE_S2,
+ ARM_64_LPAE_S1,
+ ARM_64_LPAE_S2,
+ IO_PGTABLE_NUM_FMTS,
+};
+
+/**
+ * struct iommu_gather_ops - IOMMU callbacks for TLB and page table management.
+ *
+ * @tlb_flush_all: Synchronously invalidate the entire TLB context.
+ * @tlb_add_flush: Queue up a TLB invalidation for a virtual address range.
+ * @tlb_sync: Ensure any queue TLB invalidation has taken effect.
+ * @flush_pgtable: Ensure page table updates are visible to the IOMMU.
+ *
+ * Note that these can all be called in atomic context and must therefore
+ * not block.
+ */
+struct iommu_gather_ops {
+ void (*tlb_flush_all)(void *cookie);
+ void (*tlb_add_flush)(unsigned long iova, size_t size, bool leaf,
+ void *cookie);
+ void (*tlb_sync)(void *cookie);
+ void (*flush_pgtable)(void *ptr, size_t size, void *cookie);
+};
+
+/**
+ * struct io_pgtable_cfg - Configuration data for a set of page tables.
+ *
+ * @quirks: A bitmap of hardware quirks that require some special
+ * action by the low-level page table allocator.
+ * @pgsize_bitmap: A bitmap of page sizes supported by this set of page
+ * tables.
+ * @ias: Input address (iova) size, in bits.
+ * @oas: Output address (paddr) size, in bits.
+ * @tlb: TLB management callbacks for this set of tables.
+ */
+struct io_pgtable_cfg {
+ #define IO_PGTABLE_QUIRK_ARM_NS (1 << 0) /* Set NS bit in PTEs */
+ int quirks;
+ unsigned long pgsize_bitmap;
+ unsigned int ias;
+ unsigned int oas;
+ const struct iommu_gather_ops *tlb;
+
+ /* Low-level data specific to the table format */
+ union {
+ struct {
+ u64 ttbr[2];
+ u64 tcr;
+ u64 mair[2];
+ } arm_lpae_s1_cfg;
+
+ struct {
+ u64 vttbr;
+ u64 vtcr;
+ } arm_lpae_s2_cfg;
+ };
+};
+
+/**
+ * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
+ *
+ * @map: Map a physically contiguous memory region.
+ * @unmap: Unmap a physically contiguous memory region.
+ * @iova_to_phys: Translate iova to physical address.
+ *
+ * These functions map directly onto the iommu_ops member functions with
+ * the same names.
+ */
+struct io_pgtable_ops {
+ int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot);
+ int (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
+ size_t size);
+ phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
+ unsigned long iova);
+};
+
+/**
+ * alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU.
+ *
+ * @fmt: The page table format.
+ * @cfg: The page table configuration. This will be modified to represent
+ * the configuration actually provided by the allocator (e.g. the
+ * pgsize_bitmap may be restricted).
+ * @cookie: An opaque token provided by the IOMMU driver and passed back to
+ * the callback routines in cfg->tlb.
+ */
+struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
+ struct io_pgtable_cfg *cfg,
+ void *cookie);
+
+/**
+ * free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller
+ * *must* ensure that the page table is no longer
+ * live, but the TLB can be dirty.
+ *
+ * @ops: The ops returned from alloc_io_pgtable_ops.
+ */
+void free_io_pgtable_ops(struct io_pgtable_ops *ops);
+
+
+/*
+ * Internal structures for page table allocator implementations.
+ */
+
+/**
+ * struct io_pgtable - Internal structure describing a set of page tables.
+ *
+ * @fmt: The page table format.
+ * @cookie: An opaque token provided by the IOMMU driver and passed back to
+ * any callback routines.
+ * @cfg: A copy of the page table configuration.
+ * @ops: The page table operations in use for this set of page tables.
+ */
+struct io_pgtable {
+ enum io_pgtable_fmt fmt;
+ void *cookie;
+ struct io_pgtable_cfg cfg;
+ struct io_pgtable_ops ops;
+};
+
+/**
+ * struct io_pgtable_init_fns - Alloc/free a set of page tables for a
+ * particular format.
+ *
+ * @alloc: Allocate a set of page tables described by cfg.
+ * @free: Free the page tables associated with iop.
+ */
+struct io_pgtable_init_fns {
+ struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
+ void (*free)(struct io_pgtable *iop);
+};
+
+#endif /* __IO_PGTABLE_H */
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