[PATCH v2 2/3] iommu: add support for ARM Ltd. System MMU architecture
Andreas Herrmann
andreas.herrmann at calxeda.com
Tue Jun 25 17:25:21 EDT 2013
On Mon, Jun 24, 2013 at 01:31:25PM -0400, Will Deacon wrote:
> This patch adds support for SMMUs implementing the ARM System MMU
> architecture versions 1 or 2. Both arm and arm64 are supported, although
> the v7s descriptor format is not used.
>
> Cc: Rob Herring <robherring2 at gmail.com>
> Cc: Andreas Herrmann <andreas.herrmann at calxeda.com>
> Cc: Olav Haugan <ohaugan at codeaurora.org>
> Cc: Joerg Roedel <joro at 8bytes.org>
> Signed-off-by: Will Deacon <will.deacon at arm.com>
Acked-by: Andreas Herrmann <andreas.herrmann at calxeda.com>
> ---
> drivers/iommu/Kconfig | 13 +
> drivers/iommu/Makefile | 1 +
> drivers/iommu/arm-smmu.c | 1969 ++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1983 insertions(+)
> create mode 100644 drivers/iommu/arm-smmu.c
>
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index c332fb9..957cfd4 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -261,4 +261,17 @@ config SHMOBILE_IOMMU_L1SIZE
> default 256 if SHMOBILE_IOMMU_ADDRSIZE_64MB
> default 128 if SHMOBILE_IOMMU_ADDRSIZE_32MB
>
> +config ARM_SMMU
> + bool "ARM Ltd. System MMU (SMMU) Support"
> + depends on ARM64 || (ARM_LPAE && OF)
> + select IOMMU_API
> + 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.
> +
> + Say Y here if your SoC includes an IOMMU device implementing
> + the ARM SMMU architecture.
> +
> endif # IOMMU_SUPPORT
> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
> index ef0e520..bbe7041 100644
> --- a/drivers/iommu/Makefile
> +++ b/drivers/iommu/Makefile
> @@ -3,6 +3,7 @@ obj-$(CONFIG_OF_IOMMU) += of_iommu.o
> obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o msm_iommu_dev.o
> obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
> obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
> +obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
> obj-$(CONFIG_DMAR_TABLE) += dmar.o
> obj-$(CONFIG_INTEL_IOMMU) += iova.o intel-iommu.o
> obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> new file mode 100644
> index 0000000..ebd0a4c
> --- /dev/null
> +++ b/drivers/iommu/arm-smmu.c
> @@ -0,0 +1,1969 @@
> +/*
> + * IOMMU API for ARM architected SMMU implementations.
> + *
> + * 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, write to the Free Software
> + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
> + *
> + * Copyright (C) 2013 ARM Limited
> + *
> + * Author: Will Deacon <will.deacon at arm.com>
> + *
> + * This driver currently supports:
> + * - SMMUv1 and v2 implementations
> + * - 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 39-bit addressing
> + * - Context fault reporting
> + */
> +
> +#define pr_fmt(fmt) "arm-smmu: " fmt
> +
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/iommu.h>
> +#include <linux/mm.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +
> +#include <linux/amba/bus.h>
> +
> +#include <asm/pgalloc.h>
> +
> +/* Maximum number of stream IDs assigned to a single device */
> +#define MAX_MASTER_STREAMIDS 8
> +
> +/* Maximum number of context banks per SMMU */
> +#define ARM_SMMU_MAX_CBS 128
> +
> +/* Maximum number of mapping groups per SMMU */
> +#define ARM_SMMU_MAX_SMRS 128
> +
> +/* Number of VMIDs per SMMU */
> +#define ARM_SMMU_NUM_VMIDS 256
> +
> +/* SMMU global address space */
> +#define ARM_SMMU_GR0(smmu) ((smmu)->base)
> +#define ARM_SMMU_GR1(smmu) ((smmu)->base + (smmu)->pagesize)
> +
> +/* Page table bits */
> +#define ARM_SMMU_PTE_PAGE (((pteval_t)3) << 0)
> +#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)
> +
> +#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))
> +#define ARM_SMMU_PTE_HWTABLE_SIZE (PTRS_PER_PTE * sizeof(pte_t))
> +
> +/* 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
> +
> +/* 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)
> +#define sCR0_GFRE (1 << 1)
> +#define sCR0_GFIE (1 << 2)
> +#define sCR0_GCFGFRE (1 << 4)
> +#define sCR0_GCFGFIE (1 << 5)
> +#define sCR0_USFCFG (1 << 10)
> +#define sCR0_VMIDPNE (1 << 11)
> +#define sCR0_PTM (1 << 12)
> +#define sCR0_FB (1 << 13)
> +#define sCR0_BSU_SHIFT 14
> +#define sCR0_BSU_MASK 0x3
> +
> +/* Identification registers */
> +#define ARM_SMMU_GR0_ID0 0x20
> +#define ARM_SMMU_GR0_ID1 0x24
> +#define ARM_SMMU_GR0_ID2 0x28
> +#define ARM_SMMU_GR0_ID3 0x2c
> +#define ARM_SMMU_GR0_ID4 0x30
> +#define ARM_SMMU_GR0_ID5 0x34
> +#define ARM_SMMU_GR0_ID6 0x38
> +#define ARM_SMMU_GR0_ID7 0x3c
> +#define ARM_SMMU_GR0_sGFSR 0x48
> +#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_CTTW (1 << 14)
> +#define ID0_NUMIRPT_SHIFT 16
> +#define ID0_NUMIRPT_MASK 0xff
> +#define ID0_NUMSMRG_SHIFT 0
> +#define ID0_NUMSMRG_MASK 0xff
> +
> +#define ID1_PAGESIZE (1 << 31)
> +#define ID1_NUMPAGENDXB_SHIFT 28
> +#define ID1_NUMPAGENDXB_MASK 7
> +#define ID1_NUMS2CB_SHIFT 16
> +#define ID1_NUMS2CB_MASK 0xff
> +#define ID1_NUMCB_SHIFT 0
> +#define ID1_NUMCB_MASK 0xff
> +
> +#define ID2_OAS_SHIFT 4
> +#define ID2_OAS_MASK 0xf
> +#define ID2_IAS_SHIFT 0
> +#define ID2_IAS_MASK 0xf
> +#define ID2_UBS_SHIFT 8
> +#define ID2_UBS_MASK 0xf
> +#define ID2_PTFS_4K (1 << 12)
> +#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
> +#define ARM_SMMU_GR0_sTLBGSYNC 0x70
> +#define ARM_SMMU_GR0_sTLBGSTATUS 0x74
> +#define sTLBGSTATUS_GSACTIVE (1 << 0)
> +#define TLB_LOOP_TIMEOUT 1000000 /* 1s! */
> +
> +/* Stream mapping registers */
> +#define ARM_SMMU_GR0_SMR(n) (0x800 + ((n) << 2))
> +#define SMR_VALID (1 << 31)
> +#define SMR_MASK_SHIFT 16
> +#define SMR_MASK_MASK 0x7fff
> +#define SMR_ID_SHIFT 0
> +#define SMR_ID_MASK 0x7fff
> +
> +#define ARM_SMMU_GR0_S2CR(n) (0xc00 + ((n) << 2))
> +#define S2CR_CBNDX_SHIFT 0
> +#define S2CR_CBNDX_MASK 0xff
> +#define S2CR_TYPE_SHIFT 16
> +#define S2CR_TYPE_MASK 0x3
> +#define S2CR_TYPE_TRANS (0 << S2CR_TYPE_SHIFT)
> +#define S2CR_TYPE_BYPASS (1 << S2CR_TYPE_SHIFT)
> +#define S2CR_TYPE_FAULT (2 << S2CR_TYPE_SHIFT)
> +
> +/* Context bank attribute registers */
> +#define ARM_SMMU_GR1_CBAR(n) (0x0 + ((n) << 2))
> +#define CBAR_VMID_SHIFT 0
> +#define CBAR_VMID_MASK 0xff
> +#define CBAR_S1_MEMATTR_SHIFT 12
> +#define CBAR_S1_MEMATTR_MASK 0xf
> +#define CBAR_S1_MEMATTR_WB 0xf
> +#define CBAR_TYPE_SHIFT 16
> +#define CBAR_TYPE_MASK 0x3
> +#define CBAR_TYPE_S2_TRANS (0 << CBAR_TYPE_SHIFT)
> +#define CBAR_TYPE_S1_TRANS_S2_BYPASS (1 << CBAR_TYPE_SHIFT)
> +#define CBAR_TYPE_S1_TRANS_S2_FAULT (2 << CBAR_TYPE_SHIFT)
> +#define CBAR_TYPE_S1_TRANS_S2_TRANS (3 << CBAR_TYPE_SHIFT)
> +#define CBAR_IRPTNDX_SHIFT 24
> +#define CBAR_IRPTNDX_MASK 0xff
> +
> +#define ARM_SMMU_GR1_CBA2R(n) (0x800 + ((n) << 2))
> +#define CBA2R_RW64_32BIT (0 << 0)
> +#define CBA2R_RW64_64BIT (1 << 0)
> +
> +/* Translation context bank */
> +#define ARM_SMMU_CB_BASE(smmu) ((smmu)->base + ((smmu)->size >> 1))
> +#define ARM_SMMU_CB(smmu, n) ((n) * (smmu)->pagesize)
> +
> +#define ARM_SMMU_CB_SCTLR 0x0
> +#define ARM_SMMU_CB_RESUME 0x8
> +#define ARM_SMMU_CB_TTBCR2 0x10
> +#define ARM_SMMU_CB_TTBR0_LO 0x20
> +#define ARM_SMMU_CB_TTBR0_HI 0x24
> +#define ARM_SMMU_CB_TTBCR 0x30
> +#define ARM_SMMU_CB_S1_MAIR0 0x38
> +#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 SCTLR_S1_ASIDPNE (1 << 12)
> +#define SCTLR_CFCFG (1 << 7)
> +#define SCTLR_CFIE (1 << 6)
> +#define SCTLR_CFRE (1 << 5)
> +#define SCTLR_E (1 << 4)
> +#define SCTLR_AFE (1 << 2)
> +#define SCTLR_TRE (1 << 1)
> +#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 TTBCR_PASIZE_SHIFT 16
> +#define TTBCR_PASIZE_MASK 0x7
> +
> +#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 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
> +#define TTBCR2_ADDR_42 3
> +#define TTBCR2_ADDR_44 4
> +#define TTBCR2_ADDR_48 5
> +
> +#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 FSR_MULTI (1 << 31)
> +#define FSR_SS (1 << 30)
> +#define FSR_UUT (1 << 8)
> +#define FSR_ASF (1 << 7)
> +#define FSR_TLBLKF (1 << 6)
> +#define FSR_TLBMCF (1 << 5)
> +#define FSR_EF (1 << 4)
> +#define FSR_PF (1 << 3)
> +#define FSR_AFF (1 << 2)
> +#define FSR_TF (1 << 1)
> +
> +#define FSR_IGN (FSR_AFF | FSR_ASF | FSR_TLBMCF | \
> + FSR_TLBLKF)
> +#define FSR_FAULT (FSR_MULTI | FSR_SS | FSR_UUT | \
> + FSR_EF | FSR_PF | FSR_TF)
> +
> +#define FSYNR0_WNR (1 << 4)
> +
> +struct arm_smmu_smr {
> + u8 idx;
> + u16 mask;
> + u16 id;
> +};
> +
> +struct arm_smmu_master {
> + struct device_node *of_node;
> +
> + /*
> + * The following is specific to the master's position in the
> + * SMMU chain.
> + */
> + struct rb_node node;
> + int num_streamids;
> + u16 streamids[MAX_MASTER_STREAMIDS];
> +
> + /*
> + * We only need to allocate these on the root SMMU, as we
> + * configure unmatched streams to bypass translation.
> + */
> + struct arm_smmu_smr *smrs;
> +};
> +
> +struct arm_smmu_device {
> + struct device *dev;
> + struct device_node *parent_of_node;
> +
> + void __iomem *base;
> + unsigned long size;
> + unsigned long pagesize;
> +
> +#define ARM_SMMU_FEAT_COHERENT_WALK (1 << 0)
> +#define ARM_SMMU_FEAT_STREAM_MATCH (1 << 1)
> +#define ARM_SMMU_FEAT_TRANS_S1 (1 << 2)
> +#define ARM_SMMU_FEAT_TRANS_S2 (1 << 3)
> +#define ARM_SMMU_FEAT_TRANS_NESTED (1 << 4)
> + u32 features;
> + int version;
> +
> + u32 num_context_banks;
> + u32 num_s2_context_banks;
> + DECLARE_BITMAP(context_map, ARM_SMMU_MAX_CBS);
> + atomic_t irptndx;
> +
> + u32 num_mapping_groups;
> + DECLARE_BITMAP(smr_map, ARM_SMMU_MAX_SMRS);
> +
> + unsigned long input_size;
> + unsigned long s1_output_size;
> + unsigned long s2_output_size;
> +
> + u32 num_global_irqs;
> + u32 num_context_irqs;
> + unsigned int *irqs;
> +
> + DECLARE_BITMAP(vmid_map, ARM_SMMU_NUM_VMIDS);
> +
> + struct list_head list;
> + struct rb_root masters;
> +};
> +
> +struct arm_smmu_cfg {
> + struct arm_smmu_device *smmu;
> + u8 vmid;
> + u8 cbndx;
> + u8 irptndx;
> + u32 cbar;
> + pgd_t *pgd;
> +};
> +
> +struct arm_smmu_domain {
> + /*
> + * A domain can span across multiple, chained SMMUs and requires
> + * all devices within the domain to follow the same translation
> + * path.
> + */
> + struct arm_smmu_device *leaf_smmu;
> + struct arm_smmu_cfg root_cfg;
> + phys_addr_t output_mask;
> +
> + spinlock_t lock;
> +};
> +
> +static DEFINE_SPINLOCK(arm_smmu_devices_lock);
> +static LIST_HEAD(arm_smmu_devices);
> +
> +static struct arm_smmu_master *find_smmu_master(struct arm_smmu_device *smmu,
> + struct device_node *dev_node)
> +{
> + struct rb_node *node = smmu->masters.rb_node;
> +
> + while (node) {
> + struct arm_smmu_master *master;
> + master = container_of(node, struct arm_smmu_master, node);
> +
> + if (dev_node < master->of_node)
> + node = node->rb_left;
> + else if (dev_node > master->of_node)
> + node = node->rb_right;
> + else
> + return master;
> + }
> +
> + return NULL;
> +}
> +
> +static int insert_smmu_master(struct arm_smmu_device *smmu,
> + struct arm_smmu_master *master)
> +{
> + struct rb_node **new, *parent;
> +
> + new = &smmu->masters.rb_node;
> + parent = NULL;
> + while (*new) {
> + struct arm_smmu_master *this;
> + this = container_of(*new, struct arm_smmu_master, node);
> +
> + parent = *new;
> + if (master->of_node < this->of_node)
> + new = &((*new)->rb_left);
> + else if (master->of_node > this->of_node)
> + new = &((*new)->rb_right);
> + else
> + return -EEXIST;
> + }
> +
> + rb_link_node(&master->node, parent, new);
> + rb_insert_color(&master->node, &smmu->masters);
> + return 0;
> +}
> +
> +static int register_smmu_master(struct arm_smmu_device *smmu,
> + struct device *dev,
> + struct of_phandle_args *masterspec)
> +{
> + int i;
> + struct arm_smmu_master *master;
> +
> + master = find_smmu_master(smmu, masterspec->np);
> + if (master) {
> + dev_err(dev,
> + "rejecting multiple registrations for master device %s\n",
> + masterspec->np->name);
> + return -EBUSY;
> + }
> +
> + if (masterspec->args_count > MAX_MASTER_STREAMIDS) {
> + dev_err(dev,
> + "reached maximum number (%d) of stream IDs for master device %s\n",
> + MAX_MASTER_STREAMIDS, masterspec->np->name);
> + return -ENOSPC;
> + }
> +
> + master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL);
> + if (!master)
> + return -ENOMEM;
> +
> + master->of_node = masterspec->np;
> + master->num_streamids = masterspec->args_count;
> +
> + for (i = 0; i < master->num_streamids; ++i)
> + master->streamids[i] = masterspec->args[i];
> +
> + return insert_smmu_master(smmu, master);
> +}
> +
> +static struct arm_smmu_device *find_parent_smmu(struct arm_smmu_device *smmu)
> +{
> + struct arm_smmu_device *parent;
> +
> + if (!smmu->parent_of_node)
> + return NULL;
> +
> + spin_lock(&arm_smmu_devices_lock);
> + list_for_each_entry(parent, &arm_smmu_devices, list)
> + if (parent->dev->of_node == smmu->parent_of_node)
> + goto out_unlock;
> +
> + parent = NULL;
> + dev_warn(smmu->dev,
> + "Failed to find SMMU parent despite parent in DT\n");
> +out_unlock:
> + spin_unlock(&arm_smmu_devices_lock);
> + return parent;
> +}
> +
> +static int __arm_smmu_alloc_bitmap(unsigned long *map, int start, int end)
> +{
> + int idx;
> +
> + do {
> + idx = find_next_zero_bit(map, end, start);
> + if (idx == end)
> + return -ENOSPC;
> + } while (test_and_set_bit(idx, map));
> +
> + return idx;
> +}
> +
> +static void __arm_smmu_free_bitmap(unsigned long *map, int idx)
> +{
> + clear_bit(idx, map);
> +}
> +
> +/* Wait for any pending TLB invalidations to complete */
> +static void arm_smmu_tlb_sync(struct arm_smmu_device *smmu)
> +{
> + int count = 0;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> +
> + writel_relaxed(0, gr0_base + ARM_SMMU_GR0_sTLBGSYNC);
> + while (readl_relaxed(gr0_base + ARM_SMMU_GR0_sTLBGSTATUS)
> + & sTLBGSTATUS_GSACTIVE) {
> + cpu_relax();
> + if (++count == TLB_LOOP_TIMEOUT) {
> + dev_err_ratelimited(smmu->dev,
> + "TLB sync timed out -- SMMU may be deadlocked\n");
> + return;
> + }
> + udelay(1);
> + }
> +}
> +
> +static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
> +{
> + int flags, ret;
> + u32 fsr, far, fsynr, resume;
> + unsigned long iova;
> + struct iommu_domain *domain = dev;
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg;
> + struct arm_smmu_device *smmu = root_cfg->smmu;
> + void __iomem *cb_base;
> +
> + cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, root_cfg->cbndx);
> + fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR);
> +
> + if (!(fsr & FSR_FAULT))
> + return IRQ_NONE;
> +
> + if (fsr & FSR_IGN)
> + dev_err_ratelimited(smmu->dev,
> + "Unexpected context fault (fsr 0x%u)\n",
> + fsr);
> +
> + fsynr = readl_relaxed(cb_base + ARM_SMMU_CB_FSYNR0);
> + flags = fsynr & FSYNR0_WNR ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ;
> +
> + far = readl_relaxed(cb_base + ARM_SMMU_CB_FAR_LO);
> + iova = far;
> +#ifdef CONFIG_64BIT
> + far = readl_relaxed(cb_base + ARM_SMMU_CB_FAR_HI);
> + iova |= ((unsigned long)far << 32);
> +#endif
> +
> + if (!report_iommu_fault(domain, smmu->dev, iova, flags)) {
> + ret = IRQ_HANDLED;
> + resume = RESUME_RETRY;
> + } else {
> + ret = IRQ_NONE;
> + resume = RESUME_TERMINATE;
> + }
> +
> + /* Clear the faulting FSR */
> + writel(fsr, cb_base + ARM_SMMU_CB_FSR);
> +
> + /* Retry or terminate any stalled transactions */
> + if (fsr & FSR_SS)
> + writel_relaxed(resume, cb_base + ARM_SMMU_CB_RESUME);
> +
> + return ret;
> +}
> +
> +static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
> +{
> + u32 gfsr, gfsynr0, gfsynr1, gfsynr2;
> + struct arm_smmu_device *smmu = dev;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> +
> + gfsr = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSR);
> + gfsynr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR0);
> + gfsynr1 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR1);
> + gfsynr2 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR2);
> +
> + dev_err_ratelimited(smmu->dev,
> + "Unexpected global fault, this could be serious\n");
> + dev_err_ratelimited(smmu->dev,
> + "\tGFSR 0x%08x, GFSYNR0 0x%08x, GFSYNR1 0x%08x, GFSYNR2 0x%08x\n",
> + gfsr, gfsynr0, gfsynr1, gfsynr2);
> +
> + writel(gfsr, gr0_base + ARM_SMMU_GR0_sGFSR);
> + return IRQ_NONE;
> +}
> +
> +static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain)
> +{
> + u32 reg;
> + bool stage1;
> + struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg;
> + struct arm_smmu_device *smmu = root_cfg->smmu;
> + void __iomem *cb_base, *gr0_base, *gr1_base;
> +
> + gr0_base = ARM_SMMU_GR0(smmu);
> + gr1_base = ARM_SMMU_GR1(smmu);
> + stage1 = root_cfg->cbar != CBAR_TYPE_S2_TRANS;
> + cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, root_cfg->cbndx);
> +
> + /* CBAR */
> + reg = root_cfg->cbar |
> + (root_cfg->vmid << CBAR_VMID_SHIFT);
> + if (smmu->version == 1)
> + reg |= root_cfg->irptndx << CBAR_IRPTNDX_SHIFT;
> +
> + /* Use the weakest memory type, so it is overridden by the pte */
> + if (stage1)
> + reg |= (CBAR_S1_MEMATTR_WB << CBAR_S1_MEMATTR_SHIFT);
> + writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBAR(root_cfg->cbndx));
> +
> + if (smmu->version > 1) {
> + /* CBA2R */
> +#ifdef CONFIG_64BIT
> + reg = CBA2R_RW64_64BIT;
> +#else
> + reg = CBA2R_RW64_32BIT;
> +#endif
> + writel_relaxed(reg,
> + gr1_base + ARM_SMMU_GR1_CBA2R(root_cfg->cbndx));
> +
> + /* TTBCR2 */
> + switch (smmu->input_size) {
> + case 32:
> + reg = (TTBCR2_ADDR_32 << TTBCR2_SEP_SHIFT);
> + break;
> + case 36:
> + reg = (TTBCR2_ADDR_36 << TTBCR2_SEP_SHIFT);
> + break;
> + case 39:
> + 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:
> + 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);
> + }
> +
> + /* TTBR0 */
> + reg = __pa(root_cfg->pgd);
> +#ifndef __BIG_ENDIAN
> + writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_LO);
> + reg = (phys_addr_t)__pa(root_cfg->pgd) >> 32;
> + writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_HI);
> +#else
> + writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_HI);
> + reg = (phys_addr_t)__pa(root_cfg->pgd) >> 32;
> + writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_LO);
> +#endif
> +
> + /*
> + * TTBCR
> + * We use long descriptor, with inner-shareable WBWA tables in TTBR0.
> + */
> + if (smmu->version > 1) {
> + if (PAGE_SIZE == SZ_4K)
> + reg = TTBCR_TG0_4K;
> + else
> + reg = TTBCR_TG0_64K;
> +
> + if (!stage1) {
> + switch (smmu->s2_output_size) {
> + case 32:
> + reg |= (TTBCR2_ADDR_32 << TTBCR_PASIZE_SHIFT);
> + break;
> + case 36:
> + reg |= (TTBCR2_ADDR_36 << TTBCR_PASIZE_SHIFT);
> + break;
> + case 40:
> + reg |= (TTBCR2_ADDR_40 << TTBCR_PASIZE_SHIFT);
> + break;
> + case 42:
> + reg |= (TTBCR2_ADDR_42 << TTBCR_PASIZE_SHIFT);
> + break;
> + case 44:
> + reg |= (TTBCR2_ADDR_44 << TTBCR_PASIZE_SHIFT);
> + break;
> + case 48:
> + reg |= (TTBCR2_ADDR_48 << TTBCR_PASIZE_SHIFT);
> + break;
> + }
> + } else {
> + reg |= (64 - smmu->s1_output_size) << TTBCR_T0SZ_SHIFT;
> + }
> + } else {
> + reg = 0;
> + }
> +
> + reg |= TTBCR_EAE |
> + (TTBCR_SH_IS << TTBCR_SH0_SHIFT) |
> + (TTBCR_RGN_WBWA << TTBCR_ORGN0_SHIFT) |
> + (TTBCR_RGN_WBWA << TTBCR_IRGN0_SHIFT) |
> + (TTBCR_SL0_LVL_1 << TTBCR_SL0_SHIFT);
> + writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR);
> +
> + /* MAIR0 (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));
> + writel_relaxed(reg, cb_base + ARM_SMMU_CB_S1_MAIR0);
> + }
> +
> + /* Nuke the TLB */
> + writel_relaxed(root_cfg->vmid, gr0_base + ARM_SMMU_GR0_TLBIVMID);
> + arm_smmu_tlb_sync(smmu);
> +
> + /* SCTLR */
> + reg = SCTLR_CFCFG | SCTLR_CFIE | SCTLR_CFRE | SCTLR_M | SCTLR_EAE_SBOP;
> + if (stage1)
> + reg |= SCTLR_S1_ASIDPNE;
> +#ifdef __BIG_ENDIAN
> + reg |= SCTLR_E;
> +#endif
> + writel(reg, cb_base + ARM_SMMU_CB_SCTLR);
> +}
> +
> +static int arm_smmu_init_domain_context(struct iommu_domain *domain,
> + struct device *dev)
> +{
> + int irq, ret, start;
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg;
> + struct arm_smmu_device *smmu, *parent;
> +
> + /*
> + * Walk the SMMU chain to find the root device for this chain.
> + * We assume that no masters have translations which terminate
> + * early, and therefore check that the root SMMU does indeed have
> + * a StreamID for the master in question.
> + */
> + parent = dev->archdata.iommu;
> + smmu_domain->output_mask = -1;
> + do {
> + smmu = parent;
> + smmu_domain->output_mask &= (1ULL << smmu->s2_output_size) - 1;
> + } while ((parent = find_parent_smmu(smmu)));
> +
> + if (!find_smmu_master(smmu, dev->of_node)) {
> + dev_err(dev, "unable to find root SMMU for device\n");
> + return -ENODEV;
> + }
> +
> + ret = __arm_smmu_alloc_bitmap(smmu->vmid_map, 0, ARM_SMMU_NUM_VMIDS);
> + if (IS_ERR_VALUE(ret))
> + return ret;
> +
> + root_cfg->vmid = ret;
> + if (smmu->features & ARM_SMMU_FEAT_TRANS_NESTED) {
> + /*
> + * We will likely want to change this if/when KVM gets
> + * involved.
> + */
> + root_cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS;
> + start = smmu->num_s2_context_banks;
> + } else if (smmu->features & ARM_SMMU_FEAT_TRANS_S2) {
> + root_cfg->cbar = CBAR_TYPE_S2_TRANS;
> + start = 0;
> + } else {
> + root_cfg->cbar = CBAR_TYPE_S1_TRANS_S2_BYPASS;
> + start = smmu->num_s2_context_banks;
> + }
> +
> + ret = __arm_smmu_alloc_bitmap(smmu->context_map, start,
> + smmu->num_context_banks);
> + if (IS_ERR_VALUE(ret))
> + goto out_free_vmid;
> +
> + root_cfg->cbndx = ret;
> +
> + if (smmu->version == 1) {
> + root_cfg->irptndx = atomic_inc_return(&smmu->irptndx);
> + root_cfg->irptndx %= smmu->num_context_irqs;
> + } else {
> + root_cfg->irptndx = root_cfg->cbndx;
> + }
> +
> + irq = smmu->irqs[smmu->num_global_irqs + root_cfg->irptndx];
> + ret = request_irq(irq, arm_smmu_context_fault, IRQF_SHARED,
> + "arm-smmu-context-fault", domain);
> + if (IS_ERR_VALUE(ret)) {
> + dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n",
> + root_cfg->irptndx, irq);
> + root_cfg->irptndx = -1;
> + goto out_free_context;
> + }
> +
> + root_cfg->smmu = smmu;
> + arm_smmu_init_context_bank(smmu_domain);
> + return ret;
> +
> +out_free_context:
> + __arm_smmu_free_bitmap(smmu->context_map, root_cfg->cbndx);
> +out_free_vmid:
> + __arm_smmu_free_bitmap(smmu->vmid_map, root_cfg->vmid);
> + return ret;
> +}
> +
> +static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
> +{
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg;
> + struct arm_smmu_device *smmu = root_cfg->smmu;
> + int irq;
> +
> + if (!smmu)
> + return;
> +
> + if (root_cfg->irptndx != -1) {
> + irq = smmu->irqs[smmu->num_global_irqs + root_cfg->irptndx];
> + free_irq(irq, domain);
> + }
> +
> + __arm_smmu_free_bitmap(smmu->vmid_map, root_cfg->vmid);
> + __arm_smmu_free_bitmap(smmu->context_map, root_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.
> + * We can't really do anything meaningful until we've added a
> + * master.
> + */
> + smmu_domain = kzalloc(sizeof(*smmu_domain), GFP_KERNEL);
> + if (!smmu_domain)
> + return -ENOMEM;
> +
> + pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
> + if (!pgd)
> + goto out_free_domain;
> + smmu_domain->root_cfg.pgd = pgd;
> +
> + spin_lock_init(&smmu_domain->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);
> + pgtable_page_dtor(table);
> + __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 *root_cfg = &smmu_domain->root_cfg;
> + pgd_t *pgd, *pgd_base = root_cfg->pgd;
> +
> + /*
> + * Recursively free the page tables for this domain. We don't
> + * care about speculative TLB filling, because the TLB will be
> + * nuked next time this context bank is re-allocated and no devices
> + * currently map to these tables.
> + */
> + 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)
> +{
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + arm_smmu_destroy_domain_context(domain);
> + arm_smmu_free_pgtables(smmu_domain);
> + kfree(smmu_domain);
> +}
> +
> +static int arm_smmu_master_configure_smrs(struct arm_smmu_device *smmu,
> + struct arm_smmu_master *master)
> +{
> + int i;
> + struct arm_smmu_smr *smrs;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> +
> + if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH))
> + return 0;
> +
> + if (master->smrs)
> + return -EEXIST;
> +
> + smrs = kmalloc(sizeof(*smrs) * master->num_streamids, GFP_KERNEL);
> + if (!smrs) {
> + dev_err(smmu->dev, "failed to allocate %d SMRs for master %s\n",
> + master->num_streamids, master->of_node->name);
> + return -ENOMEM;
> + }
> +
> + /* Allocate the SMRs on the root SMMU */
> + for (i = 0; i < master->num_streamids; ++i) {
> + int idx = __arm_smmu_alloc_bitmap(smmu->smr_map, 0,
> + smmu->num_mapping_groups);
> + if (IS_ERR_VALUE(idx)) {
> + dev_err(smmu->dev, "failed to allocate free SMR\n");
> + goto err_free_smrs;
> + }
> +
> + smrs[i] = (struct arm_smmu_smr) {
> + .idx = idx,
> + .mask = 0, /* We don't currently share SMRs */
> + .id = master->streamids[i],
> + };
> + }
> +
> + /* It worked! Now, poke the actual hardware */
> + for (i = 0; i < master->num_streamids; ++i) {
> + u32 reg = SMR_VALID | smrs[i].id << SMR_ID_SHIFT |
> + smrs[i].mask << SMR_MASK_SHIFT;
> + writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_SMR(smrs[i].idx));
> + }
> +
> + master->smrs = smrs;
> + return 0;
> +
> +err_free_smrs:
> + while (--i >= 0)
> + __arm_smmu_free_bitmap(smmu->smr_map, smrs[i].idx);
> + kfree(smrs);
> + return -ENOSPC;
> +}
> +
> +static void arm_smmu_master_free_smrs(struct arm_smmu_device *smmu,
> + struct arm_smmu_master *master)
> +{
> + int i;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> + struct arm_smmu_smr *smrs = master->smrs;
> +
> + /* Invalidate the SMRs before freeing back to the allocator */
> + for (i = 0; i < master->num_streamids; ++i) {
> + u8 idx = smrs[i].idx;
> + writel_relaxed(~SMR_VALID, gr0_base + ARM_SMMU_GR0_SMR(idx));
> + __arm_smmu_free_bitmap(smmu->smr_map, idx);
> + }
> +
> + master->smrs = NULL;
> + kfree(smrs);
> +}
> +
> +static void arm_smmu_bypass_stream_mapping(struct arm_smmu_device *smmu,
> + struct arm_smmu_master *master)
> +{
> + int i;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> +
> + for (i = 0; i < master->num_streamids; ++i) {
> + u16 sid = master->streamids[i];
> + writel_relaxed(S2CR_TYPE_BYPASS,
> + gr0_base + ARM_SMMU_GR0_S2CR(sid));
> + }
> +}
> +
> +static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
> + struct arm_smmu_master *master)
> +{
> + int i, ret;
> + struct arm_smmu_device *parent, *smmu = smmu_domain->root_cfg.smmu;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> +
> + ret = arm_smmu_master_configure_smrs(smmu, master);
> + if (ret)
> + return ret;
> +
> + /* Bypass the leaves */
> + smmu = smmu_domain->leaf_smmu;
> + while ((parent = find_parent_smmu(smmu))) {
> + /*
> + * We won't have a StreamID match for anything but the root
> + * smmu, so we only need to worry about StreamID indexing,
> + * where we must install bypass entries in the S2CRs.
> + */
> + if (smmu->features & ARM_SMMU_FEAT_STREAM_MATCH)
> + continue;
> +
> + arm_smmu_bypass_stream_mapping(smmu, master);
> + smmu = parent;
> + }
> +
> + /* Now we're at the root, time to point at our context bank */
> + for (i = 0; i < master->num_streamids; ++i) {
> + u32 idx, s2cr;
> + idx = master->smrs ? master->smrs[i].idx : master->streamids[i];
> + s2cr = (S2CR_TYPE_TRANS << S2CR_TYPE_SHIFT) |
> + (smmu_domain->root_cfg.cbndx << S2CR_CBNDX_SHIFT);
> + writel_relaxed(s2cr, gr0_base + ARM_SMMU_GR0_S2CR(idx));
> + }
> +
> + return 0;
> +}
> +
> +static void arm_smmu_domain_remove_master(struct arm_smmu_domain *smmu_domain,
> + struct arm_smmu_master *master)
> +{
> + struct arm_smmu_device *smmu = smmu_domain->root_cfg.smmu;
> +
> + /*
> + * We *must* clear the S2CR first, because freeing the SMR means
> + * that it can be re-allocated immediately.
> + */
> + arm_smmu_bypass_stream_mapping(smmu, master);
> + arm_smmu_master_free_smrs(smmu, master);
> +}
> +
> +static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
> +{
> + int ret = -EINVAL;
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + struct arm_smmu_device *device_smmu = dev->archdata.iommu;
> + struct arm_smmu_master *master;
> +
> + if (!device_smmu) {
> + dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n");
> + return -ENXIO;
> + }
> +
> + /*
> + * Sanity check the domain. We don't currently support domains
> + * that cross between different SMMU chains.
> + */
> + spin_lock(&smmu_domain->lock);
> + if (!smmu_domain->leaf_smmu) {
> + /* Now that we have a master, we can finalise the domain */
> + ret = arm_smmu_init_domain_context(domain, dev);
> + if (IS_ERR_VALUE(ret))
> + goto err_unlock;
> +
> + smmu_domain->leaf_smmu = device_smmu;
> + } else if (smmu_domain->leaf_smmu != device_smmu) {
> + dev_err(dev,
> + "cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
> + dev_name(smmu_domain->leaf_smmu->dev),
> + dev_name(device_smmu->dev));
> + goto err_unlock;
> + }
> + spin_unlock(&smmu_domain->lock);
> +
> + /* Looks ok, so add the device to the domain */
> + master = find_smmu_master(smmu_domain->leaf_smmu, dev->of_node);
> + if (!master)
> + return -ENODEV;
> +
> + return arm_smmu_domain_add_master(smmu_domain, master);
> +
> +err_unlock:
> + spin_unlock(&smmu_domain->lock);
> + return ret;
> +}
> +
> +static void arm_smmu_detach_dev(struct iommu_domain *domain, struct device *dev)
> +{
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + struct arm_smmu_master *master;
> +
> + master = find_smmu_master(smmu_domain->leaf_smmu, dev->of_node);
> + if (master)
> + arm_smmu_domain_remove_master(smmu_domain, master);
> +}
> +
> +static void arm_smmu_flush_pgtable(struct arm_smmu_device *smmu, void *addr,
> + size_t size)
> +{
> + unsigned long offset = (unsigned long)addr & ~PAGE_MASK;
> +
> + /*
> + * 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.
> + */
> + if (!(smmu->features & ARM_SMMU_FEAT_COHERENT_WALK))
> + dma_map_page(smmu->dev, virt_to_page(addr), offset, size,
> + DMA_TO_DEVICE);
> +}
> +
> +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 flags, 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(PGALLOC_GFP);
> + if (!table)
> + return -ENOMEM;
> +
> + arm_smmu_flush_pgtable(smmu, page_address(table),
> + ARM_SMMU_PTE_HWTABLE_SIZE);
> + pgtable_page_ctor(table);
> + pmd_populate(NULL, pmd, table);
> + arm_smmu_flush_pgtable(smmu, pmd, sizeof(*pmd));
> + }
> +
> + if (stage == 1) {
> + pteval |= ARM_SMMU_PTE_AP_UNPRIV;
> + if (!(flags & IOMMU_WRITE) && (flags & IOMMU_READ))
> + pteval |= ARM_SMMU_PTE_AP_RDONLY;
> +
> + if (flags & IOMMU_CACHE)
> + pteval |= (MAIR_ATTR_IDX_CACHE <<
> + ARM_SMMU_PTE_ATTRINDX_SHIFT);
> + } else {
> + pteval |= ARM_SMMU_PTE_HAP_FAULT;
> + if (flags & IOMMU_READ)
> + pteval |= ARM_SMMU_PTE_HAP_READ;
> + if (flags & IOMMU_WRITE)
> + pteval |= ARM_SMMU_PTE_HAP_WRITE;
> + if (flags & IOMMU_CACHE)
> + pteval |= ARM_SMMU_PTE_MEMATTR_OIWB;
> + else
> + pteval |= ARM_SMMU_PTE_MEMATTR_NC;
> + }
> +
> + /* If no access, create a faulting entry to avoid TLB fills */
> + if (!(flags & (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 flags, int stage)
> +{
> + int ret;
> + pmd_t *pmd;
> + unsigned long next, pfn = __phys_to_pfn(phys);
> +
> +#ifndef __PAGETABLE_PMD_FOLDED
> + if (pud_none(*pud)) {
> + pmd = pmd_alloc_one(NULL, addr);
> + if (!pmd)
> + return -ENOMEM;
> + } else
> +#endif
> + pmd = pmd_offset(pud, addr);
> +
> + do {
> + next = pmd_addr_end(addr, end);
> + ret = arm_smmu_alloc_init_pte(smmu, pmd, addr, end, pfn,
> + flags, stage);
> + pud_populate(NULL, pud, pmd);
> + arm_smmu_flush_pgtable(smmu, pud, sizeof(*pud));
> + phys += next - addr;
> + } while (pmd++, addr = next, addr < end);
> +
> + 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 flags, int stage)
> +{
> + int ret = 0;
> + pud_t *pud;
> + unsigned long next;
> +
> +#ifndef __PAGETABLE_PUD_FOLDED
> + if (pgd_none(*pgd)) {
> + pud = pud_alloc_one(NULL, addr);
> + if (!pud)
> + return -ENOMEM;
> + } else
> +#endif
> + pud = pud_offset(pgd, addr);
> +
> + do {
> + next = pud_addr_end(addr, end);
> + ret = arm_smmu_alloc_init_pmd(smmu, pud, addr, next, phys,
> + flags, stage);
> + pgd_populate(NULL, pud, pgd);
> + arm_smmu_flush_pgtable(smmu, pgd, sizeof(*pgd));
> + phys += next - addr;
> + } while (pud++, addr = next, addr < end);
> +
> + 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 flags)
> +{
> + int ret, stage;
> + unsigned long end;
> + phys_addr_t input_mask, output_mask;
> + struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg;
> + pgd_t *pgd = root_cfg->pgd;
> + struct arm_smmu_device *smmu = root_cfg->smmu;
> +
> + if (root_cfg->cbar == CBAR_TYPE_S2_TRANS) {
> + stage = 2;
> + output_mask = (1ULL << smmu->s2_output_size) - 1;
> + } else {
> + stage = 1;
> + output_mask = (1ULL << smmu->s1_output_size) - 1;
> + }
> +
> + if (!pgd)
> + return -EINVAL;
> +
> + if (size & ~PAGE_MASK)
> + return -EINVAL;
> +
> + input_mask = (1ULL << smmu->input_size) - 1;
> + if ((phys_addr_t)iova & ~input_mask)
> + return -ERANGE;
> +
> + if (paddr & ~output_mask)
> + return -ERANGE;
> +
> + spin_lock(&smmu_domain->lock);
> + 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,
> + flags, stage);
> + if (ret)
> + goto out_unlock;
> +
> + paddr += next - iova;
> + iova = next;
> + } while (pgd++, iova != end);
> +
> +out_unlock:
> + spin_unlock(&smmu_domain->lock);
> +
> + /* Ensure new page tables are visible to the hardware walker */
> + if (smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
> + dsb();
> +
> + return ret;
> +}
> +
> +static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
> + phys_addr_t paddr, size_t size, int flags)
> +{
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + struct arm_smmu_device *smmu = smmu_domain->leaf_smmu;
> +
> + if (!smmu_domain || !smmu)
> + return -ENODEV;
> +
> + /* Check for silent address truncation up the SMMU chain. */
> + if ((phys_addr_t)iova & ~smmu_domain->output_mask)
> + return -ERANGE;
> +
> + return arm_smmu_handle_mapping(smmu_domain, iova, paddr, size, flags);
> +}
> +
> +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;
> + struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg;
> + struct arm_smmu_device *smmu = root_cfg->smmu;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> +
> + ret = arm_smmu_handle_mapping(smmu_domain, iova, 0, size, 0);
> + writel_relaxed(root_cfg->vmid, gr0_base + ARM_SMMU_GR0_TLBIVMID);
> + arm_smmu_tlb_sync(smmu);
> + return ret ? ret : size;
> +}
> +
> +static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
> + dma_addr_t iova)
> +{
> + pgd_t *pgd;
> + pud_t *pud;
> + pmd_t *pmd;
> + pte_t *pte;
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> + struct arm_smmu_cfg *root_cfg = &smmu_domain->root_cfg;
> + struct arm_smmu_device *smmu = root_cfg->smmu;
> +
> + spin_lock(&smmu_domain->lock);
> + pgd = root_cfg->pgd;
> + if (!pgd)
> + goto err_unlock;
> +
> + pgd += pgd_index(iova);
> + if (pgd_none_or_clear_bad(pgd))
> + goto err_unlock;
> +
> + pud = pud_offset(pgd, iova);
> + if (pud_none_or_clear_bad(pud))
> + goto err_unlock;
> +
> + pmd = pmd_offset(pud, iova);
> + if (pmd_none_or_clear_bad(pmd))
> + goto err_unlock;
> +
> + pte = pmd_page_vaddr(*pmd) + pte_index(iova);
> + if (pte_none(pte))
> + goto err_unlock;
> +
> + spin_unlock(&smmu_domain->lock);
> + return __pfn_to_phys(pte_pfn(*pte)) | (iova & ~PAGE_MASK);
> +
> +err_unlock:
> + spin_unlock(&smmu_domain->lock);
> + dev_warn(smmu->dev,
> + "invalid (corrupt?) page tables detected for iova 0x%llx\n",
> + (unsigned long long)iova);
> + return -EINVAL;
> +}
> +
> +static int arm_smmu_domain_has_cap(struct iommu_domain *domain,
> + unsigned long cap)
> +{
> + unsigned long caps = 0;
> + struct arm_smmu_domain *smmu_domain = domain->priv;
> +
> + if (smmu_domain->root_cfg.smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
> + caps |= IOMMU_CAP_CACHE_COHERENCY;
> +
> + return !!(cap & caps);
> +}
> +
> +static int arm_smmu_add_device(struct device *dev)
> +{
> + struct arm_smmu_device *child, *parent, *smmu;
> + struct arm_smmu_master *master = NULL;
> +
> + spin_lock(&arm_smmu_devices_lock);
> + list_for_each_entry(parent, &arm_smmu_devices, list) {
> + smmu = parent;
> +
> + /* Try to find a child of the current SMMU. */
> + list_for_each_entry(child, &arm_smmu_devices, list) {
> + if (child->parent_of_node == parent->dev->of_node) {
> + /* Does the child sit above our master? */
> + master = find_smmu_master(child, dev->of_node);
> + if (master) {
> + smmu = NULL;
> + break;
> + }
> + }
> + }
> +
> + /* We found some children, so keep searching. */
> + if (!smmu) {
> + master = NULL;
> + continue;
> + }
> +
> + master = find_smmu_master(smmu, dev->of_node);
> + if (master)
> + break;
> + }
> + spin_unlock(&arm_smmu_devices_lock);
> +
> + if (!master)
> + return -ENODEV;
> +
> + dev->archdata.iommu = smmu;
> + return 0;
> +}
> +
> +static void arm_smmu_remove_device(struct device *dev)
> +{
> + dev->archdata.iommu = NULL;
> +}
> +
> +static struct iommu_ops arm_smmu_ops = {
> + .domain_init = arm_smmu_domain_init,
> + .domain_destroy = arm_smmu_domain_destroy,
> + .attach_dev = arm_smmu_attach_dev,
> + .detach_dev = arm_smmu_detach_dev,
> + .map = arm_smmu_map,
> + .unmap = arm_smmu_unmap,
> + .iova_to_phys = arm_smmu_iova_to_phys,
> + .domain_has_cap = arm_smmu_domain_has_cap,
> + .add_device = arm_smmu_add_device,
> + .remove_device = arm_smmu_remove_device,
> + .pgsize_bitmap = (SECTION_SIZE |
> + ARM_SMMU_PTE_CONT_SIZE |
> + PAGE_SIZE),
> +};
> +
> +static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
> +{
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> + int i = 0;
> + u32 scr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sCR0);
> +
> + /* Mark all SMRn as invalid and all S2CRn as bypass */
> + for (i = 0; i < smmu->num_mapping_groups; ++i) {
> + writel_relaxed(~SMR_VALID, gr0_base + ARM_SMMU_GR0_SMR(i));
> + writel_relaxed(S2CR_TYPE_BYPASS, gr0_base + ARM_SMMU_GR0_S2CR(i));
> + }
> +
> + /* 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);
> +
> + /* Enable fault reporting */
> + scr0 |= (sCR0_GFRE | sCR0_GFIE | sCR0_GCFGFRE | sCR0_GCFGFIE);
> +
> + /* Disable TLB broadcasting. */
> + scr0 |= (sCR0_VMIDPNE | sCR0_PTM);
> +
> + /* Enable client access, but bypass when no mapping is found */
> + scr0 &= ~(sCR0_CLIENTPD | sCR0_USFCFG);
> +
> + /* Disable forced broadcasting */
> + scr0 &= ~sCR0_FB;
> +
> + /* Don't upgrade barriers */
> + scr0 &= ~(sCR0_BSU_MASK << sCR0_BSU_SHIFT);
> +
> + /* Push the button */
> + arm_smmu_tlb_sync(smmu);
> + writel(scr0, gr0_base + ARM_SMMU_GR0_sCR0);
> +}
> +
> +static int arm_smmu_id_size_to_bits(int size)
> +{
> + switch (size) {
> + case 0:
> + return 32;
> + case 1:
> + return 36;
> + case 2:
> + return 40;
> + case 3:
> + return 42;
> + case 4:
> + return 44;
> + case 5:
> + default:
> + return 48;
> + }
> +}
> +
> +static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
> +{
> + unsigned long size;
> + void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
> + u32 id;
> +
> + dev_notice(smmu->dev, "probing hardware configuration...\n");
> +
> + /* Primecell ID */
> + id = readl_relaxed(gr0_base + ARM_SMMU_GR0_PIDR2);
> + smmu->version = ((id >> PIDR2_ARCH_SHIFT) & PIDR2_ARCH_MASK) + 1;
> + dev_notice(smmu->dev, "SMMUv%d with:\n", smmu->version);
> +
> + /* 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
> + if (id & ID0_S1TS) {
> + smmu->features |= ARM_SMMU_FEAT_TRANS_S1;
> + dev_notice(smmu->dev, "\tstage 1 translation\n");
> + }
> +
> + if (id & ID0_S2TS) {
> + smmu->features |= ARM_SMMU_FEAT_TRANS_S2;
> + dev_notice(smmu->dev, "\tstage 2 translation\n");
> + }
> +
> + if (id & ID0_NTS) {
> + smmu->features |= ARM_SMMU_FEAT_TRANS_NESTED;
> + dev_notice(smmu->dev, "\tnested translation\n");
> + }
> +
> + if (!(smmu->features &
> + (ARM_SMMU_FEAT_TRANS_S1 | ARM_SMMU_FEAT_TRANS_S2 |
> + ARM_SMMU_FEAT_TRANS_NESTED))) {
> + dev_err(smmu->dev, "\tno translation support!\n");
> + return -ENODEV;
> + }
> +
> + if (id & ID0_CTTW) {
> + smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK;
> + dev_notice(smmu->dev, "\tcoherent table walk\n");
> + }
> +
> + if (id & ID0_SMS) {
> + u32 smr, sid, mask;
> +
> + smmu->features |= ARM_SMMU_FEAT_STREAM_MATCH;
> + smmu->num_mapping_groups = (id >> ID0_NUMSMRG_SHIFT) &
> + ID0_NUMSMRG_MASK;
> + if (smmu->num_mapping_groups == 0) {
> + dev_err(smmu->dev,
> + "stream-matching supported, but no SMRs present!\n");
> + return -ENODEV;
> + }
> +
> + smr = SMR_MASK_MASK << SMR_MASK_SHIFT;
> + smr |= (SMR_ID_MASK << SMR_ID_SHIFT);
> + writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0));
> + smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
> +
> + mask = (smr >> SMR_MASK_SHIFT) & SMR_MASK_MASK;
> + sid = (smr >> SMR_ID_SHIFT) & SMR_ID_MASK;
> + if ((mask & sid) != sid) {
> + dev_err(smmu->dev,
> + "SMR mask bits (0x%x) insufficient for ID field (0x%x)\n",
> + mask, sid);
> + return -ENODEV;
> + }
> +
> + dev_notice(smmu->dev,
> + "\tstream matching with %u register groups, mask 0x%x",
> + smmu->num_mapping_groups, mask);
> + }
> +
> + /* ID1 */
> + id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID1);
> + smmu->pagesize = (id & ID1_PAGESIZE) ? SZ_64K : SZ_4K;
> +
> + /* Check that we ioremapped enough */
> + size = 1 << (((id >> ID1_NUMPAGENDXB_SHIFT) & ID1_NUMPAGENDXB_MASK) + 1);
> + size *= (smmu->pagesize << 1);
> + if (smmu->size < size)
> + dev_warn(smmu->dev,
> + "device is 0x%lx bytes but only mapped 0x%lx!\n",
> + size, smmu->size);
> +
> + 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");
> + return -ENODEV;
> + }
> + dev_notice(smmu->dev, "\t%u context banks (%u stage-2 only)\n",
> + smmu->num_context_banks, smmu->num_s2_context_banks);
> +
> + /* ID2 */
> + id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID2);
> + size = arm_smmu_id_size_to_bits((id >> ID2_IAS_SHIFT) & ID2_IAS_MASK);
> +
> + /*
> + * Stage-1 output limited by stage-2 input size due to pgd
> + * allocation (PTRS_PER_PGD).
> + */
> +#ifdef CONFIG_64BIT
> + /* Current maximum output size of 39 bits */
> + smmu->s1_output_size = min(39UL, size);
> +#else
> + smmu->s1_output_size = min(32UL, size);
> +#endif
> +
> + /* The stage-2 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((unsigned long)PHYS_MASK_SHIFT, size);
> +
> + if (smmu->version == 1) {
> + smmu->input_size = 32;
> + } else {
> +#ifdef CONFIG_64BIT
> + size = (id >> ID2_UBS_SHIFT) & ID2_UBS_MASK;
> + size = min(39, arm_smmu_id_size_to_bits(size));
> +#else
> + size = 32;
> +#endif
> + smmu->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;
> + }
> + }
> +
> + dev_notice(smmu->dev,
> + "\t%lu-bit VA, %lu-bit IPA, %lu-bit PA\n",
> + smmu->input_size, smmu->s1_output_size, smmu->s2_output_size);
> + return 0;
> +}
> +
> +static int arm_smmu_device_dt_probe(struct platform_device *pdev)
> +{
> + struct resource *res;
> + struct arm_smmu_device *smmu;
> + struct device_node *dev_node;
> + struct device *dev = &pdev->dev;
> + struct rb_node *node;
> + struct of_phandle_args masterspec;
> + int num_irqs, i, err;
> +
> + smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
> + if (!smmu) {
> + dev_err(dev, "failed to allocate arm_smmu_device\n");
> + return -ENOMEM;
> + }
> + smmu->dev = dev;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(dev, "missing base address/size\n");
> + return -ENODEV;
> + }
> +
> + smmu->size = resource_size(res);
> + smmu->base = devm_request_and_ioremap(dev, res);
> + if (!smmu->base)
> + return -EADDRNOTAVAIL;
> +
> + if (of_property_read_u32(dev->of_node, "#global-interrupts",
> + &smmu->num_global_irqs)) {
> + dev_err(dev, "missing #global-interrupts property\n");
> + return -ENODEV;
> + }
> +
> + num_irqs = 0;
> + while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs))) {
> + num_irqs++;
> + if (num_irqs > smmu->num_global_irqs)
> + smmu->num_context_irqs++;
> + }
> +
> + if (num_irqs < smmu->num_global_irqs) {
> + dev_warn(dev, "found %d interrupts but expected at least %d\n",
> + num_irqs, smmu->num_global_irqs);
> + smmu->num_global_irqs = num_irqs;
> + }
> + smmu->num_context_irqs = num_irqs - smmu->num_global_irqs;
> +
> + smmu->irqs = devm_kzalloc(dev, sizeof(*smmu->irqs) * num_irqs,
> + GFP_KERNEL);
> + if (!smmu->irqs) {
> + dev_err(dev, "failed to allocate %d irqs\n", num_irqs);
> + return -ENOMEM;
> + }
> +
> + for (i = 0; i < num_irqs; ++i) {
> + int irq = platform_get_irq(pdev, i);
> + if (irq < 0) {
> + dev_err(dev, "failed to get irq index %d\n", i);
> + return -ENODEV;
> + }
> + smmu->irqs[i] = irq;
> + }
> +
> + i = 0;
> + smmu->masters = RB_ROOT;
> + while (!of_parse_phandle_with_args(dev->of_node, "mmu-masters",
> + "#stream-id-cells", i,
> + &masterspec)) {
> + err = register_smmu_master(smmu, dev, &masterspec);
> + if (err) {
> + dev_err(dev, "failed to add master %s\n",
> + masterspec.np->name);
> + goto out_put_masters;
> + }
> +
> + i++;
> + }
> + dev_notice(dev, "registered %d master devices\n", i);
> +
> + if ((dev_node = of_parse_phandle(dev->of_node, "smmu-parent", 0)))
> + smmu->parent_of_node = dev_node;
> +
> + err = arm_smmu_device_cfg_probe(smmu);
> + if (err)
> + goto out_put_parent;
> +
> + if (smmu->version > 1 &&
> + smmu->num_context_banks != smmu->num_context_irqs) {
> + dev_err(dev,
> + "found only %d context interrupt(s) but %d required\n",
> + smmu->num_context_irqs, smmu->num_context_banks);
> + goto out_put_parent;
> + }
> +
> + arm_smmu_device_reset(smmu);
> +
> + for (i = 0; i < smmu->num_global_irqs; ++i) {
> + err = request_irq(smmu->irqs[i],
> + arm_smmu_global_fault,
> + IRQF_SHARED,
> + "arm-smmu global fault",
> + smmu);
> + if (err) {
> + dev_err(dev, "failed to request global IRQ %d (%u)\n",
> + i, smmu->irqs[i]);
> + goto out_free_irqs;
> + }
> + }
> +
> + INIT_LIST_HEAD(&smmu->list);
> + spin_lock(&arm_smmu_devices_lock);
> + list_add(&smmu->list, &arm_smmu_devices);
> + spin_unlock(&arm_smmu_devices_lock);
> + return 0;
> +
> +out_free_irqs:
> + while (i--)
> + free_irq(smmu->irqs[i], smmu);
> +
> +out_put_parent:
> + if (smmu->parent_of_node)
> + of_node_put(smmu->parent_of_node);
> +
> +out_put_masters:
> + for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
> + struct arm_smmu_master *master;
> + master = container_of(node, struct arm_smmu_master, node);
> + of_node_put(master->of_node);
> + }
> +
> + return err;
> +}
> +
> +static int arm_smmu_device_remove(struct platform_device *pdev)
> +{
> + int i;
> + struct device *dev = &pdev->dev;
> + struct arm_smmu_device *curr, *smmu = NULL;
> + struct rb_node *node;
> +
> + spin_lock(&arm_smmu_devices_lock);
> + list_for_each_entry(curr, &arm_smmu_devices, list) {
> + if (curr->dev == dev) {
> + smmu = curr;
> + list_del(&smmu->list);
> + break;
> + }
> + }
> + spin_unlock(&arm_smmu_devices_lock);
> +
> + if (!smmu)
> + return -ENODEV;
> +
> + if (smmu->parent_of_node)
> + of_node_put(smmu->parent_of_node);
> +
> + for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
> + struct arm_smmu_master *master;
> + master = container_of(node, struct arm_smmu_master, node);
> + of_node_put(master->of_node);
> + }
> +
> + if (!bitmap_empty(smmu->vmid_map, ARM_SMMU_NUM_VMIDS))
> + dev_err(dev, "removing device with active domains!\n");
> +
> + for (i = 0; i < smmu->num_global_irqs; ++i)
> + free_irq(smmu->irqs[i], smmu);
> +
> + /* Turn the thing off */
> + writel(sCR0_CLIENTPD, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_sCR0);
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static struct of_device_id arm_smmu_of_match[] = {
> + { .compatible = "arm,smmu-v1", },
> + { .compatible = "arm,smmu-v2", },
> + { .compatible = "arm,mmu-400", },
> + { .compatible = "arm,mmu-500", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
> +#endif
> +
> +static struct platform_driver arm_smmu_driver = {
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = "arm-smmu",
> + .of_match_table = of_match_ptr(arm_smmu_of_match),
> + },
> + .probe = arm_smmu_device_dt_probe,
> + .remove = arm_smmu_device_remove,
> +};
> +
> +static int __init arm_smmu_init(void)
> +{
> + int ret;
> +
> + ret = platform_driver_register(&arm_smmu_driver);
> + if (ret)
> + return ret;
> +
> + /* Oh, for a proper bus abstraction */
> + if (!iommu_present(&platform_bus_type));
> + bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
> +
> + if (!iommu_present(&amba_bustype));
> + bus_set_iommu(&amba_bustype, &arm_smmu_ops);
> +
> + return 0;
> +}
> +
> +static void __exit arm_smmu_exit(void)
> +{
> + return platform_driver_unregister(&arm_smmu_driver);
> +}
> +
> +module_init(arm_smmu_init);
> +module_exit(arm_smmu_exit);
> +
> +MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
> +MODULE_AUTHOR("Will Deacon <will.deacon at arm.com>");
> +MODULE_LICENSE("GPL v2");
> --
> 1.8.2.2
>
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