/*
 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
 * Author: Joerg Roedel <jroedel@suse.de>
 *         Leo Duran <leo.duran@amd.com>
 *
 * 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
 */

#ifndef _ASM_X86_AMD_IOMMU_TYPES_H
#define _ASM_X86_AMD_IOMMU_TYPES_H

#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/msi.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <linux/irqreturn.h>

/*
 * Maximum number of IOMMUs supported
 */
#define MAX_IOMMUS      32

/*
 * some size calculation constants
 */
#define DEV_TABLE_ENTRY_SIZE            32
#define ALIAS_TABLE_ENTRY_SIZE          2
#define RLOOKUP_TABLE_ENTRY_SIZE        (sizeof(void *))

/* Capability offsets used by the driver */
#define MMIO_CAP_HDR_OFFSET     0x00
#define MMIO_RANGE_OFFSET       0x0c
#define MMIO_MISC_OFFSET        0x10

/* Masks, shifts and macros to parse the device range capability */
#define MMIO_RANGE_LD_MASK      0xff000000
#define MMIO_RANGE_FD_MASK      0x00ff0000
#define MMIO_RANGE_BUS_MASK     0x0000ff00
#define MMIO_RANGE_LD_SHIFT     24
#define MMIO_RANGE_FD_SHIFT     16
#define MMIO_RANGE_BUS_SHIFT    8
#define MMIO_GET_LD(x)  (((x) & MMIO_RANGE_LD_MASK) >> MMIO_RANGE_LD_SHIFT)
#define MMIO_GET_FD(x)  (((x) & MMIO_RANGE_FD_MASK) >> MMIO_RANGE_FD_SHIFT)
#define MMIO_GET_BUS(x) (((x) & MMIO_RANGE_BUS_MASK) >> MMIO_RANGE_BUS_SHIFT)
#define MMIO_MSI_NUM(x) ((x) & 0x1f)

/* Flag masks for the AMD IOMMU exclusion range */
#define MMIO_EXCL_ENABLE_MASK 0x01ULL
#define MMIO_EXCL_ALLOW_MASK  0x02ULL

/* Used offsets into the MMIO space */
#define MMIO_DEV_TABLE_OFFSET   0x0000
#define MMIO_CMD_BUF_OFFSET     0x0008
#define MMIO_EVT_BUF_OFFSET     0x0010
#define MMIO_CONTROL_OFFSET     0x0018
#define MMIO_EXCL_BASE_OFFSET   0x0020
#define MMIO_EXCL_LIMIT_OFFSET  0x0028
#define MMIO_EXT_FEATURES       0x0030
#define MMIO_PPR_LOG_OFFSET     0x0038
#define MMIO_GA_LOG_BASE_OFFSET 0x00e0
#define MMIO_GA_LOG_TAIL_OFFSET 0x00e8
#define MMIO_CMD_HEAD_OFFSET    0x2000
#define MMIO_CMD_TAIL_OFFSET    0x2008
#define MMIO_EVT_HEAD_OFFSET    0x2010
#define MMIO_EVT_TAIL_OFFSET    0x2018
#define MMIO_STATUS_OFFSET      0x2020
#define MMIO_PPR_HEAD_OFFSET    0x2030
#define MMIO_PPR_TAIL_OFFSET    0x2038
#define MMIO_GA_HEAD_OFFSET     0x2040
#define MMIO_GA_TAIL_OFFSET     0x2048
#define MMIO_CNTR_CONF_OFFSET   0x4000
#define MMIO_CNTR_REG_OFFSET    0x40000
#define MMIO_REG_END_OFFSET     0x80000



/* Extended Feature Bits */
#define FEATURE_PREFETCH        (1ULL<<0)
#define FEATURE_PPR             (1ULL<<1)
#define FEATURE_X2APIC          (1ULL<<2)
#define FEATURE_NX              (1ULL<<3)
#define FEATURE_GT              (1ULL<<4)
#define FEATURE_IA              (1ULL<<6)
#define FEATURE_GA              (1ULL<<7)
#define FEATURE_HE              (1ULL<<8)
#define FEATURE_PC              (1ULL<<9)
#define FEATURE_GAM_VAPIC       (1ULL<<21)
#define FEATURE_EPHSUP          (1ULL<<50)

#define FEATURE_PASID_SHIFT     32
#define FEATURE_PASID_MASK      (0x1fULL << FEATURE_PASID_SHIFT)

#define FEATURE_GLXVAL_SHIFT    14
#define FEATURE_GLXVAL_MASK     (0x03ULL << FEATURE_GLXVAL_SHIFT)

/* Note:
 * The current driver only support 16-bit PASID.
 * Currently, hardware only implement upto 16-bit PASID
 * even though the spec says it could have upto 20 bits.
 */
#define PASID_MASK              0x0000ffff

/* MMIO status bits */
#define MMIO_STATUS_EVT_INT_MASK        (1 << 1)
#define MMIO_STATUS_COM_WAIT_INT_MASK   (1 << 2)
#define MMIO_STATUS_PPR_INT_MASK        (1 << 6)
#define MMIO_STATUS_GALOG_RUN_MASK      (1 << 8)
#define MMIO_STATUS_GALOG_OVERFLOW_MASK (1 << 9)
#define MMIO_STATUS_GALOG_INT_MASK      (1 << 10)

/* event logging constants */
#define EVENT_ENTRY_SIZE        0x10
#define EVENT_TYPE_SHIFT        28
#define EVENT_TYPE_MASK         0xf
#define EVENT_TYPE_ILL_DEV      0x1
#define EVENT_TYPE_IO_FAULT     0x2
#define EVENT_TYPE_DEV_TAB_ERR  0x3
#define EVENT_TYPE_PAGE_TAB_ERR 0x4
#define EVENT_TYPE_ILL_CMD      0x5
#define EVENT_TYPE_CMD_HARD_ERR 0x6
#define EVENT_TYPE_IOTLB_INV_TO 0x7
#define EVENT_TYPE_INV_DEV_REQ  0x8
#define EVENT_TYPE_INV_PPR_REQ  0x9
#define EVENT_DEVID_MASK        0xffff
#define EVENT_DEVID_SHIFT       0
#define EVENT_DOMID_MASK        0xffff
#define EVENT_DOMID_SHIFT       0
#define EVENT_FLAGS_MASK        0xfff
#define EVENT_FLAGS_SHIFT       0x10

/* feature control bits */
#define CONTROL_IOMMU_EN        0x00ULL
#define CONTROL_HT_TUN_EN       0x01ULL
#define CONTROL_EVT_LOG_EN      0x02ULL
#define CONTROL_EVT_INT_EN      0x03ULL
#define CONTROL_COMWAIT_EN      0x04ULL
#define CONTROL_INV_TIMEOUT     0x05ULL
#define CONTROL_PASSPW_EN       0x08ULL
#define CONTROL_RESPASSPW_EN    0x09ULL
#define CONTROL_COHERENT_EN     0x0aULL
#define CONTROL_ISOC_EN         0x0bULL
#define CONTROL_CMDBUF_EN       0x0cULL
#define CONTROL_PPFLOG_EN       0x0dULL
#define CONTROL_PPFINT_EN       0x0eULL
#define CONTROL_PPR_EN          0x0fULL
#define CONTROL_GT_EN           0x10ULL
#define CONTROL_GA_EN           0x11ULL
#define CONTROL_GAM_EN          0x19ULL
#define CONTROL_GALOG_EN        0x1CULL
#define CONTROL_GAINT_EN        0x1DULL
#define CONTROL_XT_EN           0x32ULL

#define CTRL_INV_TO_MASK        (7 << CONTROL_INV_TIMEOUT)
#define CTRL_INV_TO_NONE        0
#define CTRL_INV_TO_1MS         1
#define CTRL_INV_TO_10MS        2
#define CTRL_INV_TO_100MS       3
#define CTRL_INV_TO_1S          4
#define CTRL_INV_TO_10S         5
#define CTRL_INV_TO_100S        6

/* command specific defines */
#define CMD_COMPL_WAIT          0x01
#define CMD_INV_DEV_ENTRY       0x02
#define CMD_INV_IOMMU_PAGES     0x03
#define CMD_INV_IOTLB_PAGES     0x04
#define CMD_INV_IRT             0x05
#define CMD_COMPLETE_PPR        0x07
#define CMD_INV_ALL             0x08

#define CMD_COMPL_WAIT_STORE_MASK       0x01
#define CMD_COMPL_WAIT_INT_MASK         0x02
#define CMD_INV_IOMMU_PAGES_SIZE_MASK   0x01
#define CMD_INV_IOMMU_PAGES_PDE_MASK    0x02
#define CMD_INV_IOMMU_PAGES_GN_MASK     0x04

#define PPR_STATUS_MASK                 0xf
#define PPR_STATUS_SHIFT                12

#define CMD_INV_IOMMU_ALL_PAGES_ADDRESS 0x7fffffffffffffffULL

/* macros and definitions for device table entries */
#define DEV_ENTRY_VALID         0x00
#define DEV_ENTRY_TRANSLATION   0x01
#define DEV_ENTRY_PPR           0x34
#define DEV_ENTRY_IR            0x3d
#define DEV_ENTRY_IW            0x3e
#define DEV_ENTRY_NO_PAGE_FAULT 0x62
#define DEV_ENTRY_EX            0x67
#define DEV_ENTRY_SYSMGT1       0x68
#define DEV_ENTRY_SYSMGT2       0x69
#define DEV_ENTRY_IRQ_TBL_EN    0x80
#define DEV_ENTRY_INIT_PASS     0xb8
#define DEV_ENTRY_EINT_PASS     0xb9
#define DEV_ENTRY_NMI_PASS      0xba
#define DEV_ENTRY_LINT0_PASS    0xbe
#define DEV_ENTRY_LINT1_PASS    0xbf
#define DEV_ENTRY_MODE_MASK     0x07
#define DEV_ENTRY_MODE_SHIFT    0x09

#define MAX_DEV_TABLE_ENTRIES   0xffff

/* constants to configure the command buffer */
#define CMD_BUFFER_SIZE    8192
#define CMD_BUFFER_UNINITIALIZED 1
#define CMD_BUFFER_ENTRIES 512
#define MMIO_CMD_SIZE_SHIFT 56
#define MMIO_CMD_SIZE_512 (0x9ULL << MMIO_CMD_SIZE_SHIFT)

/* constants for event buffer handling */
#define EVT_BUFFER_SIZE         8192 /* 512 entries */
#define EVT_LEN_MASK            (0x9ULL << 56)

/* Constants for PPR Log handling */
#define PPR_LOG_ENTRIES         512
#define PPR_LOG_SIZE_SHIFT      56
#define PPR_LOG_SIZE_512        (0x9ULL << PPR_LOG_SIZE_SHIFT)
#define PPR_ENTRY_SIZE          16
#define PPR_LOG_SIZE            (PPR_ENTRY_SIZE * PPR_LOG_ENTRIES)

#define PPR_REQ_TYPE(x)         (((x) >> 60) & 0xfULL)
#define PPR_FLAGS(x)            (((x) >> 48) & 0xfffULL)
#define PPR_DEVID(x)            ((x) & 0xffffULL)
#define PPR_TAG(x)              (((x) >> 32) & 0x3ffULL)
#define PPR_PASID1(x)           (((x) >> 16) & 0xffffULL)
#define PPR_PASID2(x)           (((x) >> 42) & 0xfULL)
#define PPR_PASID(x)            ((PPR_PASID2(x) << 16) | PPR_PASID1(x))

#define PPR_REQ_FAULT           0x01

/* Constants for GA Log handling */
#define GA_LOG_ENTRIES          512
#define GA_LOG_SIZE_SHIFT       56
#define GA_LOG_SIZE_512         (0x8ULL << GA_LOG_SIZE_SHIFT)
#define GA_ENTRY_SIZE           8
#define GA_LOG_SIZE             (GA_ENTRY_SIZE * GA_LOG_ENTRIES)

#define GA_TAG(x)               (u32)(x & 0xffffffffULL)
#define GA_DEVID(x)             (u16)(((x) >> 32) & 0xffffULL)
#define GA_REQ_TYPE(x)          (((x) >> 60) & 0xfULL)

#define GA_GUEST_NR             0x1

/* Bit value definition for dte irq remapping fields*/
#define DTE_IRQ_PHYS_ADDR_MASK  (((1ULL << 45)-1) << 6)
#define DTE_IRQ_REMAP_INTCTL_MASK       (0x3ULL << 60)
#define DTE_IRQ_TABLE_LEN_MASK  (0xfULL << 1)
#define DTE_IRQ_REMAP_INTCTL    (2ULL << 60)
#define DTE_IRQ_TABLE_LEN       (8ULL << 1)
#define DTE_IRQ_REMAP_ENABLE    1ULL

#define PAGE_MODE_NONE    0x00
#define PAGE_MODE_1_LEVEL 0x01
#define PAGE_MODE_2_LEVEL 0x02
#define PAGE_MODE_3_LEVEL 0x03
#define PAGE_MODE_4_LEVEL 0x04
#define PAGE_MODE_5_LEVEL 0x05
#define PAGE_MODE_6_LEVEL 0x06

#define PM_LEVEL_SHIFT(x)       (12 + ((x) * 9))
#define PM_LEVEL_SIZE(x)        (((x) < 6) ? \
                                  ((1ULL << PM_LEVEL_SHIFT((x))) - 1): \
                                   (0xffffffffffffffffULL))
#define PM_LEVEL_INDEX(x, a)    (((a) >> PM_LEVEL_SHIFT((x))) & 0x1ffULL)
#define PM_LEVEL_ENC(x)         (((x) << 9) & 0xe00ULL)
#define PM_LEVEL_PDE(x, a)      ((a) | PM_LEVEL_ENC((x)) | \
                                 IOMMU_PTE_PR | IOMMU_PTE_IR | IOMMU_PTE_IW)
#define PM_PTE_LEVEL(pte)       (((pte) >> 9) & 0x7ULL)

#define PM_MAP_4k               0
#define PM_ADDR_MASK            0x000ffffffffff000ULL
#define PM_MAP_MASK(lvl)        (PM_ADDR_MASK & \
                                (~((1ULL << (12 + ((lvl) * 9))) - 1)))
#define PM_ALIGNED(lvl, addr)   ((PM_MAP_MASK(lvl) & (addr)) == (addr))

/*
 * Returns the page table level to use for a given page size
 * Pagesize is expected to be a power-of-two
 */
#define PAGE_SIZE_LEVEL(pagesize) \
                ((__ffs(pagesize) - 12) / 9)
/*
 * Returns the number of ptes to use for a given page size
 * Pagesize is expected to be a power-of-two
 */
#define PAGE_SIZE_PTE_COUNT(pagesize) \
                (1ULL << ((__ffs(pagesize) - 12) % 9))

/*
 * Aligns a given io-virtual address to a given page size
 * Pagesize is expected to be a power-of-two
 */
#define PAGE_SIZE_ALIGN(address, pagesize) \
                ((address) & ~((pagesize) - 1))
/*
 * Creates an IOMMU PTE for an address and a given pagesize
 * The PTE has no permission bits set
 * Pagesize is expected to be a power-of-two larger than 4096
 */
#define PAGE_SIZE_PTE(address, pagesize)                \
                (((address) | ((pagesize) - 1)) &       \
                 (~(pagesize >> 1)) & PM_ADDR_MASK)

/*
 * Takes a PTE value with mode=0x07 and returns the page size it maps
 */
#define PTE_PAGE_SIZE(pte) \
        (1ULL << (1 + ffz(((pte) | 0xfffULL))))

/*
 * Takes a page-table level and returns the default page-size for this level
 */
#define PTE_LEVEL_PAGE_SIZE(level)                      \
        (1ULL << (12 + (9 * (level))))

/*
 * Bit value definition for I/O PTE fields
 */
#define IOMMU_PTE_PR (1ULL << 0)
#define IOMMU_PTE_U  (1ULL << 59)
#define IOMMU_PTE_FC (1ULL << 60)
#define IOMMU_PTE_IR (1ULL << 61)
#define IOMMU_PTE_IW (1ULL << 62)

/*
 * Bit value definition for DTE fields
 */
#define DTE_FLAG_V  (1ULL << 0)
#define DTE_FLAG_TV (1ULL << 1)
#define DTE_FLAG_IR (1ULL << 61)
#define DTE_FLAG_IW (1ULL << 62)

#define DTE_FLAG_IOTLB  (1ULL << 32)
#define DTE_FLAG_GV     (1ULL << 55)
#define DTE_FLAG_MASK   (0x3ffULL << 32)
#define DTE_GLX_SHIFT   (56)
#define DTE_GLX_MASK    (3)
#define DEV_DOMID_MASK  0xffffULL

#define DTE_GCR3_VAL_A(x)       (((x) >> 12) & 0x00007ULL)
#define DTE_GCR3_VAL_B(x)       (((x) >> 15) & 0x0ffffULL)
#define DTE_GCR3_VAL_C(x)       (((x) >> 31) & 0xfffffULL)

#define DTE_GCR3_INDEX_A        0
#define DTE_GCR3_INDEX_B        1
#define DTE_GCR3_INDEX_C        1

#define DTE_GCR3_SHIFT_A        58
#define DTE_GCR3_SHIFT_B        16
#define DTE_GCR3_SHIFT_C        43

#define GCR3_VALID              0x01ULL

#define IOMMU_PAGE_MASK (((1ULL << 52) - 1) & ~0xfffULL)
#define IOMMU_PTE_PRESENT(pte) ((pte) & IOMMU_PTE_PR)
#define IOMMU_PTE_PAGE(pte) (iommu_phys_to_virt((pte) & IOMMU_PAGE_MASK))
#define IOMMU_PTE_MODE(pte) (((pte) >> 9) & 0x07)

#define IOMMU_PROT_MASK 0x03
#define IOMMU_PROT_IR 0x01
#define IOMMU_PROT_IW 0x02

/* IOMMU capabilities */
#define IOMMU_CAP_IOTLB   24
#define IOMMU_CAP_NPCACHE 26
#define IOMMU_CAP_EFR     27

/* IOMMU Feature Reporting Field (for IVHD type 10h */
#define IOMMU_FEAT_XTSUP_SHIFT  0
#define IOMMU_FEAT_GASUP_SHIFT  6

/* IOMMU Extended Feature Register (EFR) */
#define IOMMU_EFR_XTSUP_SHIFT   2
#define IOMMU_EFR_GASUP_SHIFT   7

#define MAX_DOMAIN_ID 65536

/* Protection domain flags */
#define PD_DMA_OPS_MASK         (1UL << 0) /* domain used for dma_ops */
#define PD_DEFAULT_MASK         (1UL << 1) /* domain is a default dma_ops
                                              domain for an IOMMU */
#define PD_PASSTHROUGH_MASK     (1UL << 2) /* domain has no page
                                              translation */
#define PD_IOMMUV2_MASK         (1UL << 3) /* domain has gcr3 table */

extern bool amd_iommu_dump;
#define DUMP_printk(format, arg...)                                     \
        do {                                                            \
                if (amd_iommu_dump)                                             \
                        printk(KERN_INFO "AMD-Vi: " format, ## arg);    \
        } while(0);

/* global flag if IOMMUs cache non-present entries */
extern bool amd_iommu_np_cache;
/* Only true if all IOMMUs support device IOTLBs */
extern bool amd_iommu_iotlb_sup;

#define MAX_IRQS_PER_TABLE      256
#define IRQ_TABLE_ALIGNMENT     128

struct irq_remap_table {
        raw_spinlock_t lock;
        unsigned min_index;
        u32 *table;
};

extern struct irq_remap_table **irq_lookup_table;

/* Interrupt remapping feature used? */
extern bool amd_iommu_irq_remap;

/* kmem_cache to get tables with 128 byte alignement */
extern struct kmem_cache *amd_iommu_irq_cache;

/*
 * Make iterating over all IOMMUs easier
 */
#define for_each_iommu(iommu) \
        list_for_each_entry((iommu), &amd_iommu_list, list)
#define for_each_iommu_safe(iommu, next) \
        list_for_each_entry_safe((iommu), (next), &amd_iommu_list, list)

#define APERTURE_RANGE_SHIFT    27      /* 128 MB */
#define APERTURE_RANGE_SIZE     (1ULL << APERTURE_RANGE_SHIFT)
#define APERTURE_RANGE_PAGES    (APERTURE_RANGE_SIZE >> PAGE_SHIFT)
#define APERTURE_MAX_RANGES     32      /* allows 4GB of DMA address space */
#define APERTURE_RANGE_INDEX(a) ((a) >> APERTURE_RANGE_SHIFT)
#define APERTURE_PAGE_INDEX(a)  (((a) >> 21) & 0x3fULL)

/*
 * This struct is used to pass information about
 * incoming PPR faults around.
 */
struct amd_iommu_fault {
        u64 address;    /* IO virtual address of the fault*/
        u32 pasid;      /* Address space identifier */
        u16 device_id;  /* Originating PCI device id */
        u16 tag;        /* PPR tag */
        u16 flags;      /* Fault flags */

};


struct iommu_domain;
struct irq_domain;
struct amd_irte_ops;

#define AMD_IOMMU_FLAG_TRANS_PRE_ENABLED      (1 << 0)

/*
 * This structure contains generic data for  IOMMU protection domains
 * independent of their use.
 */
struct protection_domain {
        struct list_head list;  /* for list of all protection domains */
        struct list_head dev_list; /* List of all devices in this domain */
        struct iommu_domain domain; /* generic domain handle used by
                                       iommu core code */
        spinlock_t lock;        /* mostly used to lock the page table*/
        struct mutex api_lock;  /* protect page tables in the iommu-api path */
        u16 id;                 /* the domain id written to the device table */
        int mode;               /* paging mode (0-6 levels) */
        u64 *pt_root;           /* page table root pointer */
        int glx;                /* Number of levels for GCR3 table */
        u64 *gcr3_tbl;          /* Guest CR3 table */
        unsigned long flags;    /* flags to find out type of domain */
        bool updated;           /* complete domain flush required */
        unsigned dev_cnt;       /* devices assigned to this domain */
        unsigned dev_iommu[MAX_IOMMUS]; /* per-IOMMU reference count */
};

/*
 * Structure where we save information about one hardware AMD IOMMU in the
 * system.
 */
struct amd_iommu {
        struct list_head list;

        /* Index within the IOMMU array */
        int index;

        /* locks the accesses to the hardware */
        raw_spinlock_t lock;

        /* Pointer to PCI device of this IOMMU */
        struct pci_dev *dev;

        /* Cache pdev to root device for resume quirks */
        struct pci_dev *root_pdev;

        /* physical address of MMIO space */
        u64 mmio_phys;

        /* physical end address of MMIO space */
        u64 mmio_phys_end;

        /* virtual address of MMIO space */
        u8 __iomem *mmio_base;

        /* capabilities of that IOMMU read from ACPI */
        u32 cap;

        /* flags read from acpi table */
        u8 acpi_flags;

        /* Extended features */
        u64 features;

        /* IOMMUv2 */
        bool is_iommu_v2;

        /* PCI device id of the IOMMU device */
        u16 devid;

        /*
         * Capability pointer. There could be more than one IOMMU per PCI
         * device function if there are more than one AMD IOMMU capability
         * pointers.
         */
        u16 cap_ptr;

        /* pci domain of this IOMMU */
        u16 pci_seg;

        /* start of exclusion range of that IOMMU */
        u64 exclusion_start;
        /* length of exclusion range of that IOMMU */
        u64 exclusion_length;

        /* command buffer virtual address */
        u8 *cmd_buf;
        u32 cmd_buf_head;
        u32 cmd_buf_tail;

        /* event buffer virtual address */
        u8 *evt_buf;

        /* Base of the PPR log, if present */
        u8 *ppr_log;

        /* Base of the GA log, if present */
        u8 *ga_log;

        /* Tail of the GA log, if present */
        u8 *ga_log_tail;

        /* true if interrupts for this IOMMU are already enabled */
        bool int_enabled;

        /* if one, we need to send a completion wait command */
        bool need_sync;

        /* Handle for IOMMU core code */
        struct iommu_device iommu;

        /*
         * We can't rely on the BIOS to restore all values on reinit, so we
         * need to stash them
         */

        /* The iommu BAR */
        u32 stored_addr_lo;
        u32 stored_addr_hi;

        /*
         * Each iommu has 6 l1s, each of which is documented as having 0x12
         * registers
         */
        u32 stored_l1[6][0x12];

        /* The l2 indirect registers */
        u32 stored_l2[0x83];

        /* The maximum PC banks and counters/bank (PCSup=1) */
        u8 max_banks;
        u8 max_counters;
#ifdef CONFIG_IRQ_REMAP
        struct irq_domain *ir_domain;
        struct irq_domain *msi_domain;

        struct amd_irte_ops *irte_ops;
#endif

        u32 flags;
        volatile u64 __aligned(8) cmd_sem;

#ifdef CONFIG_AMD_IOMMU_DEBUGFS
        /* DebugFS Info */
        struct dentry *debugfs;
#endif
};

static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)
{
        struct iommu_device *iommu = dev_to_iommu_device(dev);

        return container_of(iommu, struct amd_iommu, iommu);
}

#define ACPIHID_UID_LEN 256
#define ACPIHID_HID_LEN 9

struct acpihid_map_entry {
        struct list_head list;
        u8 uid[ACPIHID_UID_LEN];
        u8 hid[ACPIHID_HID_LEN];
        u16 devid;
        u16 root_devid;
        bool cmd_line;
        struct iommu_group *group;
};

struct devid_map {
        struct list_head list;
        u8 id;
        u16 devid;
        bool cmd_line;
};

/*
 * This struct contains device specific data for the IOMMU
 */
struct iommu_dev_data {
        struct list_head list;            /* For domain->dev_list */
        struct llist_node dev_data_list;  /* For global dev_data_list */
        struct protection_domain *domain; /* Domain the device is bound to */
        u16 devid;                        /* PCI Device ID */
        u16 alias;                        /* Alias Device ID */
        bool iommu_v2;                    /* Device can make use of IOMMUv2 */
        bool passthrough;                 /* Device is identity mapped */
        struct {
                bool enabled;
                int qdep;
        } ats;                            /* ATS state */
        bool pri_tlp;                     /* PASID TLB required for
                                             PPR completions */
        u32 errata;                       /* Bitmap for errata to apply */
        bool use_vapic;                   /* Enable device to use vapic mode */
        bool defer_attach;

        struct ratelimit_state rs;        /* Ratelimit IOPF messages */
};

/* Map HPET and IOAPIC ids to the devid used by the IOMMU */
extern struct list_head ioapic_map;
extern struct list_head hpet_map;
extern struct list_head acpihid_map;

/*
 * List with all IOMMUs in the system. This list is not locked because it is
 * only written and read at driver initialization or suspend time
 */
extern struct list_head amd_iommu_list;

/*
 * Array with pointers to each IOMMU struct
 * The indices are referenced in the protection domains
 */
extern struct amd_iommu *amd_iommus[MAX_IOMMUS];

/*
 * Declarations for the global list of all protection domains
 */
extern spinlock_t amd_iommu_pd_lock;
extern struct list_head amd_iommu_pd_list;

/*
 * Structure defining one entry in the device table
 */
struct dev_table_entry {
        u64 data[4];
};

/*
 * One entry for unity mappings parsed out of the ACPI table.
 */
struct unity_map_entry {
        struct list_head list;

        /* starting device id this entry is used for (including) */
        u16 devid_start;
        /* end device id this entry is used for (including) */
        u16 devid_end;

        /* start address to unity map (including) */
        u64 address_start;
        /* end address to unity map (including) */
        u64 address_end;

        /* required protection */
        int prot;
};

/*
 * List of all unity mappings. It is not locked because as runtime it is only
 * read. It is created at ACPI table parsing time.
 */
extern struct list_head amd_iommu_unity_map;

/*
 * Data structures for device handling
 */

/*
 * Device table used by hardware. Read and write accesses by software are
 * locked with the amd_iommu_pd_table lock.
 */
extern struct dev_table_entry *amd_iommu_dev_table;

/*
 * Alias table to find requestor ids to device ids. Not locked because only
 * read on runtime.
 */
extern u16 *amd_iommu_alias_table;

/*
 * Reverse lookup table to find the IOMMU which translates a specific device.
 */
extern struct amd_iommu **amd_iommu_rlookup_table;

/* size of the dma_ops aperture as power of 2 */
extern unsigned amd_iommu_aperture_order;

/* largest PCI device id we expect translation requests for */
extern u16 amd_iommu_last_bdf;

/* allocation bitmap for domain ids */
extern unsigned long *amd_iommu_pd_alloc_bitmap;

/*
 * If true, the addresses will be flushed on unmap time, not when
 * they are reused
 */
extern bool amd_iommu_unmap_flush;

/* Smallest max PASID supported by any IOMMU in the system */
extern u32 amd_iommu_max_pasid;

extern bool amd_iommu_v2_present;

extern bool amd_iommu_force_isolation;

/* Max levels of glxval supported */
extern int amd_iommu_max_glx_val;

/*
 * This function flushes all internal caches of
 * the IOMMU used by this driver.
 */
extern void iommu_flush_all_caches(struct amd_iommu *iommu);

static inline int get_ioapic_devid(int id)
{
        struct devid_map *entry;

        list_for_each_entry(entry, &ioapic_map, list) {
                if (entry->id == id)
                        return entry->devid;
        }

        return -EINVAL;
}

static inline int get_hpet_devid(int id)
{
        struct devid_map *entry;

        list_for_each_entry(entry, &hpet_map, list) {
                if (entry->id == id)
                        return entry->devid;
        }

        return -EINVAL;
}

enum amd_iommu_intr_mode_type {
        AMD_IOMMU_GUEST_IR_LEGACY,

        /* This mode is not visible to users. It is used when
         * we cannot fully enable vAPIC and fallback to only support
         * legacy interrupt remapping via 128-bit IRTE.
         */
        AMD_IOMMU_GUEST_IR_LEGACY_GA,
        AMD_IOMMU_GUEST_IR_VAPIC,
};

#define AMD_IOMMU_GUEST_IR_GA(x)        (x == AMD_IOMMU_GUEST_IR_VAPIC || \
                                         x == AMD_IOMMU_GUEST_IR_LEGACY_GA)

#define AMD_IOMMU_GUEST_IR_VAPIC(x)     (x == AMD_IOMMU_GUEST_IR_VAPIC)

union irte {
        u32 val;
        struct {
                u32 valid       : 1,
                    no_fault    : 1,
                    int_type    : 3,
                    rq_eoi      : 1,
                    dm          : 1,
                    rsvd_1      : 1,
                    destination : 8,
                    vector      : 8,
                    rsvd_2      : 8;
        } fields;
};

#define APICID_TO_IRTE_DEST_LO(x)    (x & 0xffffff)
#define APICID_TO_IRTE_DEST_HI(x)    ((x >> 24) & 0xff)

union irte_ga_lo {
        u64 val;

        /* For int remapping */
        struct {
                u64 valid       : 1,
                    no_fault    : 1,
                    /* ------ */
                    int_type    : 3,
                    rq_eoi      : 1,
                    dm          : 1,
                    /* ------ */
                    guest_mode  : 1,
                    destination : 24,
                    ga_tag      : 32;
        } fields_remap;

        /* For guest vAPIC */
        struct {
                u64 valid       : 1,
                    no_fault    : 1,
                    /* ------ */
                    ga_log_intr : 1,
                    rsvd1       : 3,
                    is_run      : 1,
                    /* ------ */
                    guest_mode  : 1,
                    destination : 24,
                    ga_tag      : 32;
        } fields_vapic;
};

union irte_ga_hi {
        u64 val;
        struct {
                u64 vector      : 8,
                    rsvd_1      : 4,
                    ga_root_ptr : 40,
                    rsvd_2      : 4,
                    destination : 8;
        } fields;
};

struct irte_ga {
        union irte_ga_lo lo;
        union irte_ga_hi hi;
};

struct irq_2_irte {
        u16 devid; /* Device ID for IRTE table */
        u16 index; /* Index into IRTE table*/
};

struct amd_ir_data {
        u32 cached_ga_tag;
        struct irq_2_irte irq_2_irte;
        struct msi_msg msi_entry;
        void *entry;    /* Pointer to union irte or struct irte_ga */
        void *ref;      /* Pointer to the actual irte */
};

struct amd_irte_ops {
        void (*prepare)(void *, u32, u32, u8, u32, int);
        void (*activate)(void *, u16, u16);
        void (*deactivate)(void *, u16, u16);
        void (*set_affinity)(void *, u16, u16, u8, u32);
        void *(*get)(struct irq_remap_table *, int);
        void (*set_allocated)(struct irq_remap_table *, int);
        bool (*is_allocated)(struct irq_remap_table *, int);
        void (*clear_allocated)(struct irq_remap_table *, int);
};

#ifdef CONFIG_IRQ_REMAP
extern struct amd_irte_ops irte_32_ops;
extern struct amd_irte_ops irte_128_ops;
#endif

#endif /* _ASM_X86_AMD_IOMMU_TYPES_H */