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 void etnaviv_iommu_reap_mapping(struct etnaviv_vram_mapping *mapping);
95
96 int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *ctx,
97 struct etnaviv_vram_mapping *mapping,
98 u32 memory_base, dma_addr_t paddr,
99 size_t size);
100 void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *ctx,
101 struct etnaviv_vram_mapping *mapping);
102
103 size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *ctx);
104 void etnaviv_iommu_dump(struct etnaviv_iommu_context *ctx, void *buf);
105
106 struct etnaviv_iommu_context *
107 etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
108 struct etnaviv_cmdbuf_suballoc *suballoc);
109 static inline struct etnaviv_iommu_context *
etnaviv_iommu_context_get(struct etnaviv_iommu_context * ctx)110 etnaviv_iommu_context_get(struct etnaviv_iommu_context *ctx)
111 {
112 kref_get(&ctx->refcount);
113 return ctx;
114 }
115 void etnaviv_iommu_context_put(struct etnaviv_iommu_context *ctx);
116 void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
117 struct etnaviv_iommu_context *ctx);
118
119 struct etnaviv_iommu_context *
120 etnaviv_iommuv1_context_alloc(struct etnaviv_iommu_global *global);
121 struct etnaviv_iommu_context *
122 etnaviv_iommuv2_context_alloc(struct etnaviv_iommu_global *global);
123
124 u32 etnaviv_iommuv2_get_mtlb_addr(struct etnaviv_iommu_context *context);
125 unsigned short etnaviv_iommuv2_get_pta_id(struct etnaviv_iommu_context *context);
126
127 #endif /* __ETNAVIV_MMU_H__ */
128