drivers/gpu/drm/etnaviv/etnaviv_mmu.h

   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
  12 enum etnaviv_iommu_version {
  13         ETNAVIV_IOMMU_V1 = 0,
  14         ETNAVIV_IOMMU_V2,
  15 };
  16
  17 struct etnaviv_gpu;
  18 struct etnaviv_vram_mapping;
  19 struct etnaviv_iommu_global;
  20 struct etnaviv_iommu_context;
  21
  22 struct 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
  34 extern const struct etnaviv_iommu_ops etnaviv_iommuv1_ops;
  35 extern 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
  40 struct 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
  70 struct 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
  84 int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu);
  85 void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu);
  86
  87 struct etnaviv_gem_object;
  88
  89 int 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);
  92 void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
  93         struct etnaviv_vram_mapping *mapping);
  94
  95 int 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);
  99 void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *ctx,
 100                                    struct etnaviv_vram_mapping *mapping);
 101
 102 size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *ctx);
 103 void etnaviv_iommu_dump(struct etnaviv_iommu_context *ctx, void *buf);
 104
 105 struct etnaviv_iommu_context *
 106 etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
 107                            struct etnaviv_cmdbuf_suballoc *suballoc);
 108 static inline void etnaviv_iommu_context_get(struct etnaviv_iommu_context *ctx)
 109 {
 110         kref_get(&ctx->refcount);
 111 }
 112 void etnaviv_iommu_context_put(struct etnaviv_iommu_context *ctx);
 113 void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
 114                            struct etnaviv_iommu_context *ctx);
 115
 116 struct etnaviv_iommu_context *
 117 etnaviv_iommuv1_context_alloc(struct etnaviv_iommu_global *global);
 118 struct etnaviv_iommu_context *
 119 etnaviv_iommuv2_context_alloc(struct etnaviv_iommu_global *global);
 120
 121 u32 etnaviv_iommuv2_get_mtlb_addr(struct etnaviv_iommu_context *context);
 122 unsigned short etnaviv_iommuv2_get_pta_id(struct etnaviv_iommu_context *context);
 123
 124 #endif /* __ETNAVIV_MMU_H__ */