/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright © 2006-2015, Intel Corporation.
 *
 * Authors: Ashok Raj <ashok.raj@intel.com>
 *          Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
 *          David Woodhouse <David.Woodhouse@intel.com>
 */

#ifndef _INTEL_IOMMU_H_
#define _INTEL_IOMMU_H_

#include <linux/types.h>
#include <linux/iova.h>
#include <linux/io.h>
#include <linux/idr.h>
#include <linux/mmu_notifier.h>
#include <linux/list.h>
#include <linux/iommu.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/dmar.h>

#include <asm/cacheflush.h>
#include <asm/iommu.h>

/*
 * VT-d hardware uses 4KiB page size regardless of host page size.
 */
#define VTD_PAGE_SHIFT          (12)
#define VTD_PAGE_SIZE           (1UL << VTD_PAGE_SHIFT)
#define VTD_PAGE_MASK           (((u64)-1) << VTD_PAGE_SHIFT)
#define VTD_PAGE_ALIGN(addr)    (((addr) + VTD_PAGE_SIZE - 1) & VTD_PAGE_MASK)

#define VTD_STRIDE_SHIFT        (9)
#define VTD_STRIDE_MASK         (((u64)-1) << VTD_STRIDE_SHIFT)

#define DMA_PTE_READ (1)
#define DMA_PTE_WRITE (2)
#define DMA_PTE_LARGE_PAGE (1 << 7)
#define DMA_PTE_SNP (1 << 11)

#define CONTEXT_TT_MULTI_LEVEL  0
#define CONTEXT_TT_DEV_IOTLB    1
#define CONTEXT_TT_PASS_THROUGH 2
#define CONTEXT_PASIDE          BIT_ULL(3)

/*
 * Intel IOMMU register specification per version 1.0 public spec.
 */
#define DMAR_VER_REG    0x0     /* Arch version supported by this IOMMU */
#define DMAR_CAP_REG    0x8     /* Hardware supported capabilities */
#define DMAR_ECAP_REG   0x10    /* Extended capabilities supported */
#define DMAR_GCMD_REG   0x18    /* Global command register */
#define DMAR_GSTS_REG   0x1c    /* Global status register */
#define DMAR_RTADDR_REG 0x20    /* Root entry table */
#define DMAR_CCMD_REG   0x28    /* Context command reg */
#define DMAR_FSTS_REG   0x34    /* Fault Status register */
#define DMAR_FECTL_REG  0x38    /* Fault control register */
#define DMAR_FEDATA_REG 0x3c    /* Fault event interrupt data register */
#define DMAR_FEADDR_REG 0x40    /* Fault event interrupt addr register */
#define DMAR_FEUADDR_REG 0x44   /* Upper address register */
#define DMAR_AFLOG_REG  0x58    /* Advanced Fault control */
#define DMAR_PMEN_REG   0x64    /* Enable Protected Memory Region */
#define DMAR_PLMBASE_REG 0x68   /* PMRR Low addr */
#define DMAR_PLMLIMIT_REG 0x6c  /* PMRR low limit */
#define DMAR_PHMBASE_REG 0x70   /* pmrr high base addr */
#define DMAR_PHMLIMIT_REG 0x78  /* pmrr high limit */
#define DMAR_IQH_REG    0x80    /* Invalidation queue head register */
#define DMAR_IQT_REG    0x88    /* Invalidation queue tail register */
#define DMAR_IQ_SHIFT   4       /* Invalidation queue head/tail shift */
#define DMAR_IQA_REG    0x90    /* Invalidation queue addr register */
#define DMAR_ICS_REG    0x9c    /* Invalidation complete status register */
#define DMAR_IRTA_REG   0xb8    /* Interrupt remapping table addr register */
#define DMAR_PQH_REG    0xc0    /* Page request queue head register */
#define DMAR_PQT_REG    0xc8    /* Page request queue tail register */
#define DMAR_PQA_REG    0xd0    /* Page request queue address register */
#define DMAR_PRS_REG    0xdc    /* Page request status register */
#define DMAR_PECTL_REG  0xe0    /* Page request event control register */
#define DMAR_PEDATA_REG 0xe4    /* Page request event interrupt data register */
#define DMAR_PEADDR_REG 0xe8    /* Page request event interrupt addr register */
#define DMAR_PEUADDR_REG 0xec   /* Page request event Upper address register */
#define DMAR_MTRRCAP_REG 0x100  /* MTRR capability register */
#define DMAR_MTRRDEF_REG 0x108  /* MTRR default type register */
#define DMAR_MTRR_FIX64K_00000_REG 0x120 /* MTRR Fixed range registers */
#define DMAR_MTRR_FIX16K_80000_REG 0x128
#define DMAR_MTRR_FIX16K_A0000_REG 0x130
#define DMAR_MTRR_FIX4K_C0000_REG 0x138
#define DMAR_MTRR_FIX4K_C8000_REG 0x140
#define DMAR_MTRR_FIX4K_D0000_REG 0x148
#define DMAR_MTRR_FIX4K_D8000_REG 0x150
#define DMAR_MTRR_FIX4K_E0000_REG 0x158
#define DMAR_MTRR_FIX4K_E8000_REG 0x160
#define DMAR_MTRR_FIX4K_F0000_REG 0x168
#define DMAR_MTRR_FIX4K_F8000_REG 0x170
#define DMAR_MTRR_PHYSBASE0_REG 0x180 /* MTRR Variable range registers */
#define DMAR_MTRR_PHYSMASK0_REG 0x188
#define DMAR_MTRR_PHYSBASE1_REG 0x190
#define DMAR_MTRR_PHYSMASK1_REG 0x198
#define DMAR_MTRR_PHYSBASE2_REG 0x1a0
#define DMAR_MTRR_PHYSMASK2_REG 0x1a8
#define DMAR_MTRR_PHYSBASE3_REG 0x1b0
#define DMAR_MTRR_PHYSMASK3_REG 0x1b8
#define DMAR_MTRR_PHYSBASE4_REG 0x1c0
#define DMAR_MTRR_PHYSMASK4_REG 0x1c8
#define DMAR_MTRR_PHYSBASE5_REG 0x1d0
#define DMAR_MTRR_PHYSMASK5_REG 0x1d8
#define DMAR_MTRR_PHYSBASE6_REG 0x1e0
#define DMAR_MTRR_PHYSMASK6_REG 0x1e8
#define DMAR_MTRR_PHYSBASE7_REG 0x1f0
#define DMAR_MTRR_PHYSMASK7_REG 0x1f8
#define DMAR_MTRR_PHYSBASE8_REG 0x200
#define DMAR_MTRR_PHYSMASK8_REG 0x208
#define DMAR_MTRR_PHYSBASE9_REG 0x210
#define DMAR_MTRR_PHYSMASK9_REG 0x218
#define DMAR_VCCAP_REG          0xe00 /* Virtual command capability register */
#define DMAR_VCMD_REG           0xe10 /* Virtual command register */
#define DMAR_VCRSP_REG          0xe20 /* Virtual command response register */

#define OFFSET_STRIDE           (9)

#define dmar_readq(a) readq(a)
#define dmar_writeq(a,v) writeq(v,a)

#define DMAR_VER_MAJOR(v)               (((v) & 0xf0) >> 4)
#define DMAR_VER_MINOR(v)               ((v) & 0x0f)

/*
 * Decoding Capability Register
 */
#define cap_5lp_support(c)      (((c) >> 60) & 1)
#define cap_pi_support(c)       (((c) >> 59) & 1)
#define cap_fl1gp_support(c)    (((c) >> 56) & 1)
#define cap_read_drain(c)       (((c) >> 55) & 1)
#define cap_write_drain(c)      (((c) >> 54) & 1)
#define cap_max_amask_val(c)    (((c) >> 48) & 0x3f)
#define cap_num_fault_regs(c)   ((((c) >> 40) & 0xff) + 1)
#define cap_pgsel_inv(c)        (((c) >> 39) & 1)

#define cap_super_page_val(c)   (((c) >> 34) & 0xf)
#define cap_super_offset(c)     (((find_first_bit(&cap_super_page_val(c), 4)) \
                                        * OFFSET_STRIDE) + 21)

#define cap_fault_reg_offset(c) ((((c) >> 24) & 0x3ff) * 16)
#define cap_max_fault_reg_offset(c) \
        (cap_fault_reg_offset(c) + cap_num_fault_regs(c) * 16)

#define cap_zlr(c)              (((c) >> 22) & 1)
#define cap_isoch(c)            (((c) >> 23) & 1)
#define cap_mgaw(c)             ((((c) >> 16) & 0x3f) + 1)
#define cap_sagaw(c)            (((c) >> 8) & 0x1f)
#define cap_caching_mode(c)     (((c) >> 7) & 1)
#define cap_phmr(c)             (((c) >> 6) & 1)
#define cap_plmr(c)             (((c) >> 5) & 1)
#define cap_rwbf(c)             (((c) >> 4) & 1)
#define cap_afl(c)              (((c) >> 3) & 1)
#define cap_ndoms(c)            (((unsigned long)1) << (4 + 2 * ((c) & 0x7)))
/*
 * Extended Capability Register
 */

#define ecap_smpwc(e)           (((e) >> 48) & 0x1)
#define ecap_flts(e)            (((e) >> 47) & 0x1)
#define ecap_slts(e)            (((e) >> 46) & 0x1)
#define ecap_smts(e)            (((e) >> 43) & 0x1)
#define ecap_dit(e)             ((e >> 41) & 0x1)
#define ecap_pasid(e)           ((e >> 40) & 0x1)
#define ecap_pss(e)             ((e >> 35) & 0x1f)
#define ecap_eafs(e)            ((e >> 34) & 0x1)
#define ecap_nwfs(e)            ((e >> 33) & 0x1)
#define ecap_srs(e)             ((e >> 31) & 0x1)
#define ecap_ers(e)             ((e >> 30) & 0x1)
#define ecap_prs(e)             ((e >> 29) & 0x1)
#define ecap_broken_pasid(e)    ((e >> 28) & 0x1)
#define ecap_dis(e)             ((e >> 27) & 0x1)
#define ecap_nest(e)            ((e >> 26) & 0x1)
#define ecap_mts(e)             ((e >> 25) & 0x1)
#define ecap_ecs(e)             ((e >> 24) & 0x1)
#define ecap_iotlb_offset(e)    ((((e) >> 8) & 0x3ff) * 16)
#define ecap_max_iotlb_offset(e) (ecap_iotlb_offset(e) + 16)
#define ecap_coherent(e)        ((e) & 0x1)
#define ecap_qis(e)             ((e) & 0x2)
#define ecap_pass_through(e)    ((e >> 6) & 0x1)
#define ecap_eim_support(e)     ((e >> 4) & 0x1)
#define ecap_ir_support(e)      ((e >> 3) & 0x1)
#define ecap_dev_iotlb_support(e)       (((e) >> 2) & 0x1)
#define ecap_max_handle_mask(e) ((e >> 20) & 0xf)
#define ecap_sc_support(e)      ((e >> 7) & 0x1) /* Snooping Control */

/* IOTLB_REG */
#define DMA_TLB_FLUSH_GRANU_OFFSET  60
#define DMA_TLB_GLOBAL_FLUSH (((u64)1) << 60)
#define DMA_TLB_DSI_FLUSH (((u64)2) << 60)
#define DMA_TLB_PSI_FLUSH (((u64)3) << 60)
#define DMA_TLB_IIRG(type) ((type >> 60) & 3)
#define DMA_TLB_IAIG(val) (((val) >> 57) & 3)
#define DMA_TLB_READ_DRAIN (((u64)1) << 49)
#define DMA_TLB_WRITE_DRAIN (((u64)1) << 48)
#define DMA_TLB_DID(id) (((u64)((id) & 0xffff)) << 32)
#define DMA_TLB_IVT (((u64)1) << 63)
#define DMA_TLB_IH_NONLEAF (((u64)1) << 6)
#define DMA_TLB_MAX_SIZE (0x3f)

/* INVALID_DESC */
#define DMA_CCMD_INVL_GRANU_OFFSET  61
#define DMA_ID_TLB_GLOBAL_FLUSH (((u64)1) << 4)
#define DMA_ID_TLB_DSI_FLUSH    (((u64)2) << 4)
#define DMA_ID_TLB_PSI_FLUSH    (((u64)3) << 4)
#define DMA_ID_TLB_READ_DRAIN   (((u64)1) << 7)
#define DMA_ID_TLB_WRITE_DRAIN  (((u64)1) << 6)
#define DMA_ID_TLB_DID(id)      (((u64)((id & 0xffff) << 16)))
#define DMA_ID_TLB_IH_NONLEAF   (((u64)1) << 6)
#define DMA_ID_TLB_ADDR(addr)   (addr)
#define DMA_ID_TLB_ADDR_MASK(mask)      (mask)

/* PMEN_REG */
#define DMA_PMEN_EPM (((u32)1)<<31)
#define DMA_PMEN_PRS (((u32)1)<<0)

/* GCMD_REG */
#define DMA_GCMD_TE (((u32)1) << 31)
#define DMA_GCMD_SRTP (((u32)1) << 30)
#define DMA_GCMD_SFL (((u32)1) << 29)
#define DMA_GCMD_EAFL (((u32)1) << 28)
#define DMA_GCMD_WBF (((u32)1) << 27)
#define DMA_GCMD_QIE (((u32)1) << 26)
#define DMA_GCMD_SIRTP (((u32)1) << 24)
#define DMA_GCMD_IRE (((u32) 1) << 25)
#define DMA_GCMD_CFI (((u32) 1) << 23)

/* GSTS_REG */
#define DMA_GSTS_TES (((u32)1) << 31)
#define DMA_GSTS_RTPS (((u32)1) << 30)
#define DMA_GSTS_FLS (((u32)1) << 29)
#define DMA_GSTS_AFLS (((u32)1) << 28)
#define DMA_GSTS_WBFS (((u32)1) << 27)
#define DMA_GSTS_QIES (((u32)1) << 26)
#define DMA_GSTS_IRTPS (((u32)1) << 24)
#define DMA_GSTS_IRES (((u32)1) << 25)
#define DMA_GSTS_CFIS (((u32)1) << 23)

/* DMA_RTADDR_REG */
#define DMA_RTADDR_RTT (((u64)1) << 11)
#define DMA_RTADDR_SMT (((u64)1) << 10)

/* CCMD_REG */
#define DMA_CCMD_ICC (((u64)1) << 63)
#define DMA_CCMD_GLOBAL_INVL (((u64)1) << 61)
#define DMA_CCMD_DOMAIN_INVL (((u64)2) << 61)
#define DMA_CCMD_DEVICE_INVL (((u64)3) << 61)
#define DMA_CCMD_FM(m) (((u64)((m) & 0x3)) << 32)
#define DMA_CCMD_MASK_NOBIT 0
#define DMA_CCMD_MASK_1BIT 1
#define DMA_CCMD_MASK_2BIT 2
#define DMA_CCMD_MASK_3BIT 3
#define DMA_CCMD_SID(s) (((u64)((s) & 0xffff)) << 16)
#define DMA_CCMD_DID(d) ((u64)((d) & 0xffff))

/* FECTL_REG */
#define DMA_FECTL_IM (((u32)1) << 31)

/* FSTS_REG */
#define DMA_FSTS_PFO (1 << 0) /* Primary Fault Overflow */
#define DMA_FSTS_PPF (1 << 1) /* Primary Pending Fault */
#define DMA_FSTS_IQE (1 << 4) /* Invalidation Queue Error */
#define DMA_FSTS_ICE (1 << 5) /* Invalidation Completion Error */
#define DMA_FSTS_ITE (1 << 6) /* Invalidation Time-out Error */
#define DMA_FSTS_PRO (1 << 7) /* Page Request Overflow */
#define dma_fsts_fault_record_index(s) (((s) >> 8) & 0xff)

/* FRCD_REG, 32 bits access */
#define DMA_FRCD_F (((u32)1) << 31)
#define dma_frcd_type(d) ((d >> 30) & 1)
#define dma_frcd_fault_reason(c) (c & 0xff)
#define dma_frcd_source_id(c) (c & 0xffff)
/* low 64 bit */
#define dma_frcd_page_addr(d) (d & (((u64)-1) << PAGE_SHIFT))

/* PRS_REG */
#define DMA_PRS_PPR     ((u32)1)

#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts)                     \
do {                                                                    \
        cycles_t start_time = get_cycles();                             \
        while (1) {                                                     \
                sts = op(iommu->reg + offset);                          \
                if (cond)                                               \
                        break;                                          \
                if (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\
                        panic("DMAR hardware is malfunctioning\n");     \
                cpu_relax();                                            \
        }                                                               \
} while (0)

#define QI_LENGTH       256     /* queue length */

enum {
        QI_FREE,
        QI_IN_USE,
        QI_DONE,
        QI_ABORT
};

#define QI_CC_TYPE              0x1
#define QI_IOTLB_TYPE           0x2
#define QI_DIOTLB_TYPE          0x3
#define QI_IEC_TYPE             0x4
#define QI_IWD_TYPE             0x5
#define QI_EIOTLB_TYPE          0x6
#define QI_PC_TYPE              0x7
#define QI_DEIOTLB_TYPE         0x8
#define QI_PGRP_RESP_TYPE       0x9
#define QI_PSTRM_RESP_TYPE      0xa

#define QI_IEC_SELECTIVE        (((u64)1) << 4)
#define QI_IEC_IIDEX(idx)       (((u64)(idx & 0xffff) << 32))
#define QI_IEC_IM(m)            (((u64)(m & 0x1f) << 27))

#define QI_IWD_STATUS_DATA(d)   (((u64)d) << 32)
#define QI_IWD_STATUS_WRITE     (((u64)1) << 5)

#define QI_IOTLB_DID(did)       (((u64)did) << 16)
#define QI_IOTLB_DR(dr)         (((u64)dr) << 7)
#define QI_IOTLB_DW(dw)         (((u64)dw) << 6)
#define QI_IOTLB_GRAN(gran)     (((u64)gran) >> (DMA_TLB_FLUSH_GRANU_OFFSET-4))
#define QI_IOTLB_ADDR(addr)     (((u64)addr) & VTD_PAGE_MASK)
#define QI_IOTLB_IH(ih)         (((u64)ih) << 6)
#define QI_IOTLB_AM(am)         (((u8)am))

#define QI_CC_FM(fm)            (((u64)fm) << 48)
#define QI_CC_SID(sid)          (((u64)sid) << 32)
#define QI_CC_DID(did)          (((u64)did) << 16)
#define QI_CC_GRAN(gran)        (((u64)gran) >> (DMA_CCMD_INVL_GRANU_OFFSET-4))

#define QI_DEV_IOTLB_SID(sid)   ((u64)((sid) & 0xffff) << 32)
#define QI_DEV_IOTLB_QDEP(qdep) (((qdep) & 0x1f) << 16)
#define QI_DEV_IOTLB_ADDR(addr) ((u64)(addr) & VTD_PAGE_MASK)
#define QI_DEV_IOTLB_PFSID(pfsid) (((u64)(pfsid & 0xf) << 12) | ((u64)(pfsid & 0xfff) << 52))
#define QI_DEV_IOTLB_SIZE       1
#define QI_DEV_IOTLB_MAX_INVS   32

#define QI_PC_PASID(pasid)      (((u64)pasid) << 32)
#define QI_PC_DID(did)          (((u64)did) << 16)
#define QI_PC_GRAN(gran)        (((u64)gran) << 4)

#define QI_PC_ALL_PASIDS        (QI_PC_TYPE | QI_PC_GRAN(0))
#define QI_PC_PASID_SEL         (QI_PC_TYPE | QI_PC_GRAN(1))

#define QI_EIOTLB_ADDR(addr)    ((u64)(addr) & VTD_PAGE_MASK)
#define QI_EIOTLB_IH(ih)        (((u64)ih) << 6)
#define QI_EIOTLB_AM(am)        (((u64)am))
#define QI_EIOTLB_PASID(pasid)  (((u64)pasid) << 32)
#define QI_EIOTLB_DID(did)      (((u64)did) << 16)
#define QI_EIOTLB_GRAN(gran)    (((u64)gran) << 4)

#define QI_DEV_EIOTLB_ADDR(a)   ((u64)(a) & VTD_PAGE_MASK)
#define QI_DEV_EIOTLB_SIZE      (((u64)1) << 11)
#define QI_DEV_EIOTLB_GLOB(g)   ((u64)g)
#define QI_DEV_EIOTLB_PASID(p)  (((u64)p) << 32)
#define QI_DEV_EIOTLB_SID(sid)  ((u64)((sid) & 0xffff) << 16)
#define QI_DEV_EIOTLB_QDEP(qd)  ((u64)((qd) & 0x1f) << 4)
#define QI_DEV_EIOTLB_PFSID(pfsid) (((u64)(pfsid & 0xf) << 12) | ((u64)(pfsid & 0xfff) << 52))
#define QI_DEV_EIOTLB_MAX_INVS  32

/* Page group response descriptor QW0 */
#define QI_PGRP_PASID_P(p)      (((u64)(p)) << 4)
#define QI_PGRP_PDP(p)          (((u64)(p)) << 5)
#define QI_PGRP_RESP_CODE(res)  (((u64)(res)) << 12)
#define QI_PGRP_DID(rid)        (((u64)(rid)) << 16)
#define QI_PGRP_PASID(pasid)    (((u64)(pasid)) << 32)

/* Page group response descriptor QW1 */
#define QI_PGRP_LPIG(x)         (((u64)(x)) << 2)
#define QI_PGRP_IDX(idx)        (((u64)(idx)) << 3)


#define QI_RESP_SUCCESS         0x0
#define QI_RESP_INVALID         0x1
#define QI_RESP_FAILURE         0xf

#define QI_GRAN_NONG_PASID              2
#define QI_GRAN_PSI_PASID               3

#define qi_shift(iommu)         (DMAR_IQ_SHIFT + !!ecap_smts((iommu)->ecap))

struct qi_desc {
        u64 qw0;
        u64 qw1;
        u64 qw2;
        u64 qw3;
};

struct q_inval {
        raw_spinlock_t  q_lock;
        void            *desc;          /* invalidation queue */
        int             *desc_status;   /* desc status */
        int             free_head;      /* first free entry */
        int             free_tail;      /* last free entry */
        int             free_cnt;
};

#ifdef CONFIG_IRQ_REMAP
/* 1MB - maximum possible interrupt remapping table size */
#define INTR_REMAP_PAGE_ORDER   8
#define INTR_REMAP_TABLE_REG_SIZE       0xf
#define INTR_REMAP_TABLE_REG_SIZE_MASK  0xf

#define INTR_REMAP_TABLE_ENTRIES        65536

struct irq_domain;

struct ir_table {
        struct irte *base;
        unsigned long *bitmap;
};
#endif

struct iommu_flush {
        void (*flush_context)(struct intel_iommu *iommu, u16 did, u16 sid,
                              u8 fm, u64 type);
        void (*flush_iotlb)(struct intel_iommu *iommu, u16 did, u64 addr,
                            unsigned int size_order, u64 type);
};

enum {
        SR_DMAR_FECTL_REG,
        SR_DMAR_FEDATA_REG,
        SR_DMAR_FEADDR_REG,
        SR_DMAR_FEUADDR_REG,
        MAX_SR_DMAR_REGS
};

#define VTD_FLAG_TRANS_PRE_ENABLED      (1 << 0)
#define VTD_FLAG_IRQ_REMAP_PRE_ENABLED  (1 << 1)

extern int intel_iommu_sm;

#define sm_supported(iommu)     (intel_iommu_sm && ecap_smts((iommu)->ecap))
#define pasid_supported(iommu)  (sm_supported(iommu) &&                 \
                                 ecap_pasid((iommu)->ecap))

struct pasid_entry;
struct pasid_state_entry;
struct page_req_dsc;

/*
 * 0: Present
 * 1-11: Reserved
 * 12-63: Context Ptr (12 - (haw-1))
 * 64-127: Reserved
 */
struct root_entry {
        u64     lo;
        u64     hi;
};

/*
 * low 64 bits:
 * 0: present
 * 1: fault processing disable
 * 2-3: translation type
 * 12-63: address space root
 * high 64 bits:
 * 0-2: address width
 * 3-6: aval
 * 8-23: domain id
 */
struct context_entry {
        u64 lo;
        u64 hi;
};

struct dmar_domain {
        int     nid;                    /* node id */

        unsigned        iommu_refcnt[DMAR_UNITS_SUPPORTED];
                                        /* Refcount of devices per iommu */


        u16             iommu_did[DMAR_UNITS_SUPPORTED];
                                        /* Domain ids per IOMMU. Use u16 since
                                         * domain ids are 16 bit wide according
                                         * to VT-d spec, section 9.3 */
        unsigned int    auxd_refcnt;    /* Refcount of auxiliary attaching */

        bool has_iotlb_device;
        struct list_head devices;       /* all devices' list */
        struct list_head auxd;          /* link to device's auxiliary list */
        struct iova_domain iovad;       /* iova's that belong to this domain */

        struct dma_pte  *pgd;           /* virtual address */
        int             gaw;            /* max guest address width */

        /* adjusted guest address width, 0 is level 2 30-bit */
        int             agaw;

        int             flags;          /* flags to find out type of domain */

        int             iommu_coherency;/* indicate coherency of iommu access */
        int             iommu_snooping; /* indicate snooping control feature*/
        int             iommu_count;    /* reference count of iommu */
        int             iommu_superpage;/* Level of superpages supported:
                                           0 == 4KiB (no superpages), 1 == 2MiB,
                                           2 == 1GiB, 3 == 512GiB, 4 == 1TiB */
        u64             max_addr;       /* maximum mapped address */

        int             default_pasid;  /*
                                         * The default pasid used for non-SVM
                                         * traffic on mediated devices.
                                         */

        struct iommu_domain domain;     /* generic domain data structure for
                                           iommu core */
};

struct intel_iommu {
        void __iomem    *reg; /* Pointer to hardware regs, virtual addr */
        u64             reg_phys; /* physical address of hw register set */
        u64             reg_size; /* size of hw register set */
        u64             cap;
        u64             ecap;
        u32             gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
        raw_spinlock_t  register_lock; /* protect register handling */
        int             seq_id; /* sequence id of the iommu */
        int             agaw; /* agaw of this iommu */
        int             msagaw; /* max sagaw of this iommu */
        unsigned int    irq, pr_irq;
        u16             segment;     /* PCI segment# */
        unsigned char   name[13];    /* Device Name */

#ifdef CONFIG_INTEL_IOMMU
        unsigned long   *domain_ids; /* bitmap of domains */
        struct dmar_domain ***domains; /* ptr to domains */
        spinlock_t      lock; /* protect context, domain ids */
        struct root_entry *root_entry; /* virtual address */

        struct iommu_flush flush;
#endif
#ifdef CONFIG_INTEL_IOMMU_SVM
        struct page_req_dsc *prq;
        unsigned char prq_name[16];    /* Name for PRQ interrupt */
#endif
        struct q_inval  *qi;            /* Queued invalidation info */
        u32 *iommu_state; /* Store iommu states between suspend and resume.*/

#ifdef CONFIG_IRQ_REMAP
        struct ir_table *ir_table;      /* Interrupt remapping info */
        struct irq_domain *ir_domain;
        struct irq_domain *ir_msi_domain;
#endif
        struct iommu_device iommu;  /* IOMMU core code handle */
        int             node;
        u32             flags;      /* Software defined flags */
};

/* PCI domain-device relationship */
struct device_domain_info {
        struct list_head link;  /* link to domain siblings */
        struct list_head global; /* link to global list */
        struct list_head table; /* link to pasid table */
        struct list_head auxiliary_domains; /* auxiliary domains
                                             * attached to this device
                                             */
        u8 bus;                 /* PCI bus number */
        u8 devfn;               /* PCI devfn number */
        u16 pfsid;              /* SRIOV physical function source ID */
        u8 pasid_supported:3;
        u8 pasid_enabled:1;
        u8 pri_supported:1;
        u8 pri_enabled:1;
        u8 ats_supported:1;
        u8 ats_enabled:1;
        u8 auxd_enabled:1;      /* Multiple domains per device */
        u8 ats_qdep;
        struct device *dev; /* it's NULL for PCIe-to-PCI bridge */
        struct intel_iommu *iommu; /* IOMMU used by this device */
        struct dmar_domain *domain; /* pointer to domain */
        struct pasid_table *pasid_table; /* pasid table */
};

static inline void __iommu_flush_cache(
        struct intel_iommu *iommu, void *addr, int size)
{
        if (!ecap_coherent(iommu->ecap))
                clflush_cache_range(addr, size);
}

/*
 * 0: readable
 * 1: writable
 * 2-6: reserved
 * 7: super page
 * 8-10: available
 * 11: snoop behavior
 * 12-63: Host physcial address
 */
struct dma_pte {
        u64 val;
};

static inline void dma_clear_pte(struct dma_pte *pte)
{
        pte->val = 0;
}

static inline u64 dma_pte_addr(struct dma_pte *pte)
{
#ifdef CONFIG_64BIT
        return pte->val & VTD_PAGE_MASK;
#else
        /* Must have a full atomic 64-bit read */
        return  __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK;
#endif
}

static inline bool dma_pte_present(struct dma_pte *pte)
{
        return (pte->val & 3) != 0;
}

static inline bool dma_pte_superpage(struct dma_pte *pte)
{
        return (pte->val & DMA_PTE_LARGE_PAGE);
}

static inline int first_pte_in_page(struct dma_pte *pte)
{
        return !((unsigned long)pte & ~VTD_PAGE_MASK);
}

extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);
extern int dmar_find_matched_atsr_unit(struct pci_dev *dev);

extern int dmar_enable_qi(struct intel_iommu *iommu);
extern void dmar_disable_qi(struct intel_iommu *iommu);
extern int dmar_reenable_qi(struct intel_iommu *iommu);
extern void qi_global_iec(struct intel_iommu *iommu);

extern void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid,
                             u8 fm, u64 type);
extern void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
                          unsigned int size_order, u64 type);
extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
                        u16 qdep, u64 addr, unsigned mask);
extern int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);

extern int dmar_ir_support(void);

void *alloc_pgtable_page(int node);
void free_pgtable_page(void *vaddr);
struct intel_iommu *domain_get_iommu(struct dmar_domain *domain);
int for_each_device_domain(int (*fn)(struct device_domain_info *info,
                                     void *data), void *data);
void iommu_flush_write_buffer(struct intel_iommu *iommu);
int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev);

#ifdef CONFIG_INTEL_IOMMU_SVM
int intel_svm_init(struct intel_iommu *iommu);
extern int intel_svm_enable_prq(struct intel_iommu *iommu);
extern int intel_svm_finish_prq(struct intel_iommu *iommu);

struct svm_dev_ops;

struct intel_svm_dev {
        struct list_head list;
        struct rcu_head rcu;
        struct device *dev;
        struct svm_dev_ops *ops;
        int users;
        u16 did;
        u16 dev_iotlb:1;
        u16 sid, qdep;
};

struct intel_svm {
        struct mmu_notifier notifier;
        struct mm_struct *mm;
        struct intel_iommu *iommu;
        int flags;
        int pasid;
        struct list_head devs;
        struct list_head list;
};

extern struct intel_iommu *intel_svm_device_to_iommu(struct device *dev);
#endif

#ifdef CONFIG_INTEL_IOMMU_DEBUGFS
void intel_iommu_debugfs_init(void);
#else
static inline void intel_iommu_debugfs_init(void) {}
#endif /* CONFIG_INTEL_IOMMU_DEBUGFS */

extern const struct attribute_group *intel_iommu_groups[];
bool context_present(struct context_entry *context);
struct context_entry *iommu_context_addr(struct intel_iommu *iommu, u8 bus,
                                         u8 devfn, int alloc);

#ifdef CONFIG_INTEL_IOMMU
extern int iommu_calculate_agaw(struct intel_iommu *iommu);
extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
extern int dmar_disabled;
extern int intel_iommu_enabled;
extern int intel_iommu_tboot_noforce;
#else
static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
{
        return 0;
}
static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
{
        return 0;
}
#define dmar_disabled   (1)
#define intel_iommu_enabled (0)
#endif

#endif