/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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 _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/dma_remapping.h>
#include <linux/mmu_notifier.h>
#include <linux/list.h>
#include <linux/iommu.h>
#include <asm/cacheflush.h>
#include <asm/iommu.h>

/*
 * 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 OFFSET_STRIDE           (9)

#ifdef CONFIG_64BIT
#define dmar_readq(a) readq(a)
#define dmar_writeq(a,v) writeq(v,a)
#else
static inline u64 dmar_readq(void __iomem *addr)
{
        u32 lo, hi;
        lo = readl(addr);
        hi = readl(addr + 4);
        return (((u64) hi) << 32) + lo;
}

static inline void dmar_writeq(void __iomem *addr, u64 val)
{
        writel((u32)val, addr);
        writel((u32)(val >> 32), addr + 4);
}
#endif

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

/*
 * Decoding Capability Register
 */
#define cap_pi_support(c)       (((c) >> 59) & 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_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)

/* 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_PPF ((u32)2)
#define DMA_FSTS_PFO ((u32)1)
#define DMA_FSTS_IQE (1 << 4)
#define DMA_FSTS_ICE (1 << 5)
#define DMA_FSTS_ITE (1 << 6)
#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_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_GL(gl)        (((u64)gl) << 7)
#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_MAX_INVS  32

#define QI_PGRP_IDX(idx)        (((u64)(idx)) << 55)
#define QI_PGRP_PRIV(priv)      (((u64)(priv)) << 32)
#define QI_PGRP_RESP_CODE(res)  ((u64)(res))
#define QI_PGRP_PASID(pasid)    (((u64)(pasid)) << 32)
#define QI_PGRP_DID(did)        (((u64)(did)) << 16)
#define QI_PGRP_PASID_P(p)      (((u64)(p)) << 4)

#define QI_PSTRM_ADDR(addr)     (((u64)(addr)) & VTD_PAGE_MASK)
#define QI_PSTRM_DEVFN(devfn)   (((u64)(devfn)) << 4)
#define QI_PSTRM_RESP_CODE(res) ((u64)(res))
#define QI_PSTRM_IDX(idx)       (((u64)(idx)) << 55)
#define QI_PSTRM_PRIV(priv)     (((u64)(priv)) << 32)
#define QI_PSTRM_BUS(bus)       (((u64)(bus)) << 24)
#define QI_PSTRM_PASID(pasid)   (((u64)(pasid)) << 4)

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

#define QI_GRAN_ALL_ALL                 0
#define QI_GRAN_NONG_ALL                1
#define QI_GRAN_NONG_PASID              2
#define QI_GRAN_PSI_PASID               3

struct qi_desc {
        u64 low, high;
};

struct q_inval {
        raw_spinlock_t  q_lock;
        struct qi_desc  *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)

struct pasid_entry;
struct pasid_state_entry;
struct page_req_dsc;

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
        /* These are large and need to be contiguous, so we allocate just
         * one for now. We'll maybe want to rethink that if we truly give
         * devices away to userspace processes (e.g. for DPDK) and don't
         * want to trust that userspace will use *only* the PASID it was
         * told to. But while it's all driver-arbitrated, we're fine. */
        struct pasid_entry *pasid_table;
        struct pasid_state_entry *pasid_state_table;
        struct page_req_dsc *prq;
        unsigned char prq_name[16];    /* Name for PRQ interrupt */
        struct idr pasid_idr;
        u32 pasid_max;
#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 */
};

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

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 qdep,
                               u64 addr, unsigned mask);

extern int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);

extern int dmar_ir_support(void);

#ifdef CONFIG_INTEL_IOMMU_SVM
extern int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu);
extern int intel_svm_free_pasid_tables(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;
};

extern int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev);
extern struct intel_iommu *intel_svm_device_to_iommu(struct device *dev);
#endif

extern const struct attribute_group *intel_iommu_groups[];

#endif