LXR linux/drivers/gpu/drm/etnaviv/etnaviv

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (C) 2015-2018 Etnaviv Project
   4 */
   5
   6#ifndef __ETNAVIV_MMU_H__
   7#define __ETNAVIV_MMU_H__
   8
   9#define ETNAVIV_PROT_READ       (1 << 0)
  10#define ETNAVIV_PROT_WRITE      (1 << 1)
  11
  12enum etnaviv_iommu_version {
  13        ETNAVIV_IOMMU_V1 = 0,
  14        ETNAVIV_IOMMU_V2,
  15};
  16
  17struct etnaviv_gpu;
  18struct etnaviv_vram_mapping;
  19struct etnaviv_iommu_global;
  20struct etnaviv_iommu_context;
  21
  22struct etnaviv_iommu_ops {
  23        struct etnaviv_iommu_context *(*init)(struct etnaviv_iommu_global *);
  24        void (*free)(struct etnaviv_iommu_context *);
  25        int (*map)(struct etnaviv_iommu_context *context, unsigned long iova,
  26                   phys_addr_t paddr, size_t size, int prot);
  27        size_t (*unmap)(struct etnaviv_iommu_context *context, unsigned long iova,
  28                        size_t size);
  29        size_t (*dump_size)(struct etnaviv_iommu_context *);
  30        void (*dump)(struct etnaviv_iommu_context *, void *);
  31        void (*restore)(struct etnaviv_gpu *, struct etnaviv_iommu_context *);
  32};
  33
  34extern const struct etnaviv_iommu_ops etnaviv_iommuv1_ops;
  35extern const struct etnaviv_iommu_ops etnaviv_iommuv2_ops;
  36
  37#define ETNAVIV_PTA_SIZE        SZ_4K
  38#define ETNAVIV_PTA_ENTRIES     (ETNAVIV_PTA_SIZE / sizeof(u64))
  39
  40struct etnaviv_iommu_global {
  41        struct device *dev;
  42        enum etnaviv_iommu_version version;
  43        const struct etnaviv_iommu_ops *ops;
  44        unsigned int use;
  45        struct mutex lock;
  46
  47        void *bad_page_cpu;
  48        dma_addr_t bad_page_dma;
  49
  50        u32 memory_base;
  51
  52        /*
  53         * This union holds members needed by either MMUv1 or MMUv2, which
  54         * can not exist at the same time.
  55         */
  56        union {
  57                struct {
  58                        struct etnaviv_iommu_context *shared_context;
  59                } v1;
  60                struct {
  61                        /* P(age) T(able) A(rray) */
  62                        u64 *pta_cpu;
  63                        dma_addr_t pta_dma;
  64                        struct spinlock pta_lock;
  65                        DECLARE_BITMAP(pta_alloc, ETNAVIV_PTA_ENTRIES);
  66                } v2;
  67        };
  68};
  69
  70struct etnaviv_iommu_context {
  71        struct kref refcount;
  72        struct etnaviv_iommu_global *global;
  73
  74        /* memory manager for GPU address area */
  75        struct mutex lock;
  76        struct list_head mappings;
  77        struct drm_mm mm;
  78        unsigned int flush_seq;
  79
  80        /* Not part of the context, but needs to have the same lifetime */
  81        struct etnaviv_vram_mapping cmdbuf_mapping;
  82};
  83
  84int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu);
  85void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu);
  86
  87struct etnaviv_gem_object;
  88
  89int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context,
  90        struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
  91        struct etnaviv_vram_mapping *mapping, u64 va);
  92void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
  93        struct etnaviv_vram_mapping *mapping);
  94
  95int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *ctx,
  96                                  struct etnaviv_vram_mapping *mapping,
  97                                  u32 memory_base, dma_addr_t paddr,
  98                                  size_t size);
  99void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *ctx,
 100                                   struct etnaviv_vram_mapping *mapping);
 101
 102size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *ctx);
 103void etnaviv_iommu_dump(struct etnaviv_iommu_context *ctx, void *buf);
 104
 105struct etnaviv_iommu_context *
 106etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
 107                           struct etnaviv_cmdbuf_suballoc *suballoc);
 108static inline struct etnaviv_iommu_context *
 109etnaviv_iommu_context_get(struct etnaviv_iommu_context *ctx)
 110{
 111        kref_get(&ctx->refcount);
 112        return ctx;
 113}
 114void etnaviv_iommu_context_put(struct etnaviv_iommu_context *ctx);
 115void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
 116                           struct etnaviv_iommu_context *ctx);
 117
 118struct etnaviv_iommu_context *
 119etnaviv_iommuv1_context_alloc(struct etnaviv_iommu_global *global);
 120struct etnaviv_iommu_context *
 121etnaviv_iommuv2_context_alloc(struct etnaviv_iommu_global *global);
 122
 123u32 etnaviv_iommuv2_get_mtlb_addr(struct etnaviv_iommu_context *context);
 124unsigned short etnaviv_iommuv2_get_pta_id(struct etnaviv_iommu_context *context);
 125
 126#endif /* __ETNAVIV_MMU_H__ */
 127