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57692c94 EA |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* Copyright (C) 2015-2018 Broadcom */ | |
3 | ||
4 | /** | |
5 | * DOC: V3D GEM BO management support | |
6 | * | |
7 | * Compared to VC4 (V3D 2.x), V3D 3.3 introduces an MMU between the | |
8 | * GPU and the bus, allowing us to use shmem objects for our storage | |
9 | * instead of CMA. | |
10 | * | |
11 | * Physically contiguous objects may still be imported to V3D, but the | |
12 | * driver doesn't allocate physically contiguous objects on its own. | |
13 | * Display engines requiring physically contiguous allocations should | |
14 | * look into Mesa's "renderonly" support (as used by the Mesa pl111 | |
15 | * driver) for an example of how to integrate with V3D. | |
16 | * | |
17 | * Long term, we should support evicting pages from the MMU when under | |
18 | * memory pressure (thus the v3d_bo_get_pages() refcounting), but | |
19 | * that's not a high priority since our systems tend to not have swap. | |
20 | */ | |
21 | ||
22 | #include <linux/dma-buf.h> | |
23 | #include <linux/pfn_t.h> | |
24 | ||
25 | #include "v3d_drv.h" | |
26 | #include "uapi/drm/v3d_drm.h" | |
27 | ||
57692c94 EA |
28 | /* Called DRM core on the last userspace/kernel unreference of the |
29 | * BO. | |
30 | */ | |
31 | void v3d_free_object(struct drm_gem_object *obj) | |
32 | { | |
33 | struct v3d_dev *v3d = to_v3d_dev(obj->dev); | |
34 | struct v3d_bo *bo = to_v3d_bo(obj); | |
35 | ||
40609d48 EA |
36 | v3d_mmu_remove_ptes(bo); |
37 | ||
57692c94 EA |
38 | mutex_lock(&v3d->bo_lock); |
39 | v3d->bo_stats.num_allocated--; | |
40 | v3d->bo_stats.pages_allocated -= obj->size >> PAGE_SHIFT; | |
41 | mutex_unlock(&v3d->bo_lock); | |
42 | ||
57692c94 EA |
43 | spin_lock(&v3d->mm_lock); |
44 | drm_mm_remove_node(&bo->node); | |
45 | spin_unlock(&v3d->mm_lock); | |
46 | ||
40609d48 EA |
47 | /* GPU execution may have dirtied any pages in the BO. */ |
48 | bo->base.pages_mark_dirty_on_put = true; | |
57692c94 | 49 | |
a193f3b4 | 50 | drm_gem_shmem_free(&bo->base); |
57692c94 EA |
51 | } |
52 | ||
40609d48 EA |
53 | static const struct drm_gem_object_funcs v3d_gem_funcs = { |
54 | .free = v3d_free_object, | |
c7fbcb71 TZ |
55 | .print_info = drm_gem_shmem_object_print_info, |
56 | .pin = drm_gem_shmem_object_pin, | |
57 | .unpin = drm_gem_shmem_object_unpin, | |
58 | .get_sg_table = drm_gem_shmem_object_get_sg_table, | |
59 | .vmap = drm_gem_shmem_object_vmap, | |
60 | .vunmap = drm_gem_shmem_object_vunmap, | |
61 | .mmap = drm_gem_shmem_object_mmap, | |
d315bdbf | 62 | .vm_ops = &drm_gem_shmem_vm_ops, |
40609d48 EA |
63 | }; |
64 | ||
65 | /* gem_create_object function for allocating a BO struct and doing | |
66 | * early setup. | |
67 | */ | |
68 | struct drm_gem_object *v3d_create_object(struct drm_device *dev, size_t size) | |
57692c94 | 69 | { |
40609d48 EA |
70 | struct v3d_bo *bo; |
71 | struct drm_gem_object *obj; | |
57692c94 | 72 | |
40609d48 | 73 | if (size == 0) |
4ff22f48 | 74 | return ERR_PTR(-EINVAL); |
57692c94 | 75 | |
40609d48 EA |
76 | bo = kzalloc(sizeof(*bo), GFP_KERNEL); |
77 | if (!bo) | |
4ff22f48 | 78 | return ERR_PTR(-ENOMEM); |
40609d48 | 79 | obj = &bo->base.base; |
408633d2 | 80 | |
40609d48 | 81 | obj->funcs = &v3d_gem_funcs; |
0cf2ef46 | 82 | bo->base.map_wc = true; |
40609d48 EA |
83 | INIT_LIST_HEAD(&bo->unref_head); |
84 | ||
85 | return &bo->base.base; | |
57692c94 EA |
86 | } |
87 | ||
40609d48 EA |
88 | static int |
89 | v3d_bo_create_finish(struct drm_gem_object *obj) | |
57692c94 | 90 | { |
40609d48 EA |
91 | struct v3d_dev *v3d = to_v3d_dev(obj->dev); |
92 | struct v3d_bo *bo = to_v3d_bo(obj); | |
93 | struct sg_table *sgt; | |
57692c94 EA |
94 | int ret; |
95 | ||
40609d48 EA |
96 | /* So far we pin the BO in the MMU for its lifetime, so use |
97 | * shmem's helper for getting a lifetime sgt. | |
98 | */ | |
a193f3b4 | 99 | sgt = drm_gem_shmem_get_pages_sgt(&bo->base); |
40609d48 EA |
100 | if (IS_ERR(sgt)) |
101 | return PTR_ERR(sgt); | |
102 | ||
103 | spin_lock(&v3d->mm_lock); | |
104 | /* Allocate the object's space in the GPU's page tables. | |
105 | * Inserting PTEs will happen later, but the offset is for the | |
106 | * lifetime of the BO. | |
107 | */ | |
108 | ret = drm_mm_insert_node_generic(&v3d->mm, &bo->node, | |
109 | obj->size >> PAGE_SHIFT, | |
110 | GMP_GRANULARITY >> PAGE_SHIFT, 0, 0); | |
111 | spin_unlock(&v3d->mm_lock); | |
57692c94 EA |
112 | if (ret) |
113 | return ret; | |
114 | ||
40609d48 EA |
115 | /* Track stats for /debug/dri/n/bo_stats. */ |
116 | mutex_lock(&v3d->bo_lock); | |
117 | v3d->bo_stats.num_allocated++; | |
118 | v3d->bo_stats.pages_allocated += obj->size >> PAGE_SHIFT; | |
119 | mutex_unlock(&v3d->bo_lock); | |
120 | ||
121 | v3d_mmu_insert_ptes(bo); | |
57692c94 | 122 | |
40609d48 | 123 | return 0; |
57692c94 EA |
124 | } |
125 | ||
40609d48 EA |
126 | struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv, |
127 | size_t unaligned_size) | |
57692c94 | 128 | { |
40609d48 EA |
129 | struct drm_gem_shmem_object *shmem_obj; |
130 | struct v3d_bo *bo; | |
57692c94 EA |
131 | int ret; |
132 | ||
40609d48 | 133 | shmem_obj = drm_gem_shmem_create(dev, unaligned_size); |
fc0c77fc DC |
134 | if (IS_ERR(shmem_obj)) |
135 | return ERR_CAST(shmem_obj); | |
40609d48 | 136 | bo = to_v3d_bo(&shmem_obj->base); |
57692c94 | 137 | |
40609d48 EA |
138 | ret = v3d_bo_create_finish(&shmem_obj->base); |
139 | if (ret) | |
140 | goto free_obj; | |
57692c94 | 141 | |
40609d48 | 142 | return bo; |
57692c94 | 143 | |
40609d48 | 144 | free_obj: |
a193f3b4 | 145 | drm_gem_shmem_free(shmem_obj); |
40609d48 | 146 | return ERR_PTR(ret); |
57692c94 EA |
147 | } |
148 | ||
149 | struct drm_gem_object * | |
150 | v3d_prime_import_sg_table(struct drm_device *dev, | |
151 | struct dma_buf_attachment *attach, | |
152 | struct sg_table *sgt) | |
153 | { | |
154 | struct drm_gem_object *obj; | |
40609d48 | 155 | int ret; |
57692c94 | 156 | |
40609d48 EA |
157 | obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt); |
158 | if (IS_ERR(obj)) | |
159 | return obj; | |
cc3f60cf | 160 | |
40609d48 EA |
161 | ret = v3d_bo_create_finish(obj); |
162 | if (ret) { | |
a193f3b4 | 163 | drm_gem_shmem_free(&to_v3d_bo(obj)->base); |
40609d48 EA |
164 | return ERR_PTR(ret); |
165 | } | |
57692c94 EA |
166 | |
167 | return obj; | |
168 | } | |
169 | ||
170 | int v3d_create_bo_ioctl(struct drm_device *dev, void *data, | |
171 | struct drm_file *file_priv) | |
172 | { | |
173 | struct drm_v3d_create_bo *args = data; | |
174 | struct v3d_bo *bo = NULL; | |
175 | int ret; | |
176 | ||
177 | if (args->flags != 0) { | |
178 | DRM_INFO("unknown create_bo flags: %d\n", args->flags); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | bo = v3d_bo_create(dev, file_priv, PAGE_ALIGN(args->size)); | |
183 | if (IS_ERR(bo)) | |
184 | return PTR_ERR(bo); | |
185 | ||
186 | args->offset = bo->node.start << PAGE_SHIFT; | |
187 | ||
40609d48 | 188 | ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle); |
2b86189e | 189 | drm_gem_object_put(&bo->base.base); |
57692c94 EA |
190 | |
191 | return ret; | |
192 | } | |
193 | ||
194 | int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data, | |
195 | struct drm_file *file_priv) | |
196 | { | |
197 | struct drm_v3d_mmap_bo *args = data; | |
198 | struct drm_gem_object *gem_obj; | |
57692c94 EA |
199 | |
200 | if (args->flags != 0) { | |
201 | DRM_INFO("unknown mmap_bo flags: %d\n", args->flags); | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | gem_obj = drm_gem_object_lookup(file_priv, args->handle); | |
206 | if (!gem_obj) { | |
207 | DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); | |
208 | return -ENOENT; | |
209 | } | |
210 | ||
40609d48 | 211 | args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node); |
2b86189e | 212 | drm_gem_object_put(gem_obj); |
57692c94 | 213 | |
40609d48 | 214 | return 0; |
57692c94 EA |
215 | } |
216 | ||
217 | int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data, | |
218 | struct drm_file *file_priv) | |
219 | { | |
220 | struct drm_v3d_get_bo_offset *args = data; | |
221 | struct drm_gem_object *gem_obj; | |
222 | struct v3d_bo *bo; | |
223 | ||
224 | gem_obj = drm_gem_object_lookup(file_priv, args->handle); | |
225 | if (!gem_obj) { | |
226 | DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); | |
227 | return -ENOENT; | |
228 | } | |
229 | bo = to_v3d_bo(gem_obj); | |
230 | ||
231 | args->offset = bo->node.start << PAGE_SHIFT; | |
232 | ||
2b86189e | 233 | drm_gem_object_put(gem_obj); |
57692c94 EA |
234 | return 0; |
235 | } |