1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
#ifndef _DRM_TTM_H
#define _DRM_TTM_H
#define DRM_HAS_TTM
/*
* The backend GART interface. (In our case AGP). Any similar type of device (PCIE?)
* needs only to implement these functions to be usable with the "TTM" interface.
* The AGP backend implementation lives in drm_agpsupport.c
* basically maps these calls to available functions in agpgart. Each drm device driver gets an
* additional function pointer that creates these types,
* so that the device can choose the correct aperture.
* (Multiple AGP apertures, etc.)
* Most device drivers will let this point to the standard AGP implementation.
*/
typedef struct drm_ttm_backend {
unsigned long aperture_base;
void *private;
int (*needs_cache_adjust) (struct drm_ttm_backend * backend);
int (*populate) (struct drm_ttm_backend * backend,
unsigned long num_pages, struct page ** pages);
void (*clear) (struct drm_ttm_backend * backend);
int (*bind) (struct drm_ttm_backend * backend, unsigned long offset);
int (*unbind) (struct drm_ttm_backend * backend);
void (*destroy) (struct drm_ttm_backend * backend);
} drm_ttm_backend_t;
#define DRM_FLUSH_READ (0x01)
#define DRM_FLUSH_WRITE (0x02)
#define DRM_FLUSH_EXE (0x04)
typedef struct drm_ttm_backend_list {
drm_hash_item_t hash;
uint32_t flags;
atomic_t refcount;
struct list_head head;
drm_ttm_backend_t *be;
unsigned page_offset;
unsigned num_pages;
struct drm_ttm *owner;
drm_file_t *anon_owner;
struct page **anon_pages;
int anon_locked;
enum {
ttm_bound,
ttm_evicted,
ttm_unbound
} state;
} drm_ttm_backend_list_t;
typedef struct drm_ttm_vma_list {
struct list_head head;
pgprot_t orig_protection;
struct vm_area_struct *vma;
drm_map_t *map;
} drm_ttm_vma_list_t;
typedef struct drm_ttm {
struct list_head p_mm_list;
atomic_t shared_count;
uint32_t mm_list_seq;
unsigned long aperture_base;
struct page **pages;
uint32_t *page_flags;
unsigned long lhandle;
unsigned long num_pages;
drm_ttm_vma_list_t *vma_list;
struct drm_device *dev;
drm_ttm_backend_list_t *be_list;
atomic_t vma_count;
atomic_t unfinished_regions;
drm_file_t *owner;
int destroy;
int mmap_sem_locked;
} drm_ttm_t;
/*
* Initialize a ttm. Currently the size is fixed. Currently drmAddMap calls this function
* and creates a DRM map of type _DRM_TTM, and returns a reference to that map to the
* caller.
*/
drm_ttm_t *drm_init_ttm(struct drm_device *dev, unsigned long size);
/*
* Bind a part of the ttm starting at page_offset size n_pages into the GTT, at
* aperture offset aper_offset. The region handle will be used to reference this
* bound region in the future. Note that the region may be the whole ttm.
* Regions should not overlap.
* This function sets all affected pages as noncacheable and flushes cashes and TLB.
*/
int drm_create_ttm_region(drm_ttm_t * ttm, unsigned long page_offset,
unsigned long n_pages, int cached,
drm_ttm_backend_list_t ** region);
int drm_bind_ttm_region(drm_ttm_backend_list_t * region,
unsigned long aper_offset);
/*
* Unbind a ttm region. Restores caching policy. Flushes caches and TLB.
*/
void drm_unbind_ttm_region(drm_ttm_backend_list_t * entry);
void drm_destroy_ttm_region(drm_ttm_backend_list_t * entry);
/*
* Evict a ttm region. Keeps Aperture caching policy.
*/
int drm_evict_ttm_region(drm_ttm_backend_list_t * entry);
/*
* Rebind an already evicted region into a possibly new location in the aperture.
*/
int drm_rebind_ttm_region(drm_ttm_backend_list_t * entry,
unsigned long aper_offset);
/*
* Destroy a ttm. The user normally calls drmRmMap or a similar IOCTL to do this,
* which calls this function iff there are no vmas referencing it anymore. Otherwise it is called
* when the last vma exits.
*/
extern int drm_destroy_ttm(drm_ttm_t * ttm);
extern void drm_user_destroy_region(drm_ttm_backend_list_t * entry);
extern int drm_ttm_add_mm_to_list(drm_ttm_t * ttm, struct mm_struct *mm);
extern void drm_ttm_delete_mm(drm_ttm_t * ttm, struct mm_struct *mm);
extern void drm_ttm_fence_before_destroy(drm_ttm_t * ttm);
extern void drm_fence_unfenced_region(drm_ttm_backend_list_t * entry);
extern int drm_ttm_ioctl(DRM_IOCTL_ARGS);
extern int drm_mm_init_ioctl(DRM_IOCTL_ARGS);
extern int drm_mm_fence_ioctl(DRM_IOCTL_ARGS);
#define DRM_MASK_VAL(dest, mask, val) \
(dest) = ((dest) & ~(mask)) | ((val) & (mask));
#define DRM_TTM_MASK_FLAGS ((1 << PAGE_SHIFT) - 1)
#define DRM_TTM_MASK_PFN (0xFFFFFFFFU - DRM_TTM_MASK_FLAGS)
/*
* Page flags.
*/
#define DRM_TTM_PAGE_UNCACHED 0x01
#define DRM_TTM_PAGE_USED 0x02
#define DRM_TTM_PAGE_BOUND 0x04
#define DRM_TTM_PAGE_PRESENT 0x08
#endif
|
