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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 | |
40609d48 | 50 | drm_gem_shmem_free_object(obj); |
57692c94 EA |
51 | } |
52 | ||
40609d48 EA |
53 | static const struct drm_gem_object_funcs v3d_gem_funcs = { |
54 | .free = v3d_free_object, | |
55 | .print_info = drm_gem_shmem_print_info, | |
56 | .pin = drm_gem_shmem_pin, | |
57 | .unpin = drm_gem_shmem_unpin, | |
58 | .get_sg_table = drm_gem_shmem_get_sg_table, | |
59 | .vmap = drm_gem_shmem_vmap, | |
60 | .vunmap = drm_gem_shmem_vunmap, | |
61 | .vm_ops = &drm_gem_shmem_vm_ops, | |
62 | }; | |
63 | ||
64 | /* gem_create_object function for allocating a BO struct and doing | |
65 | * early setup. | |
66 | */ | |
67 | struct drm_gem_object *v3d_create_object(struct drm_device *dev, size_t size) | |
57692c94 | 68 | { |
40609d48 EA |
69 | struct v3d_bo *bo; |
70 | struct drm_gem_object *obj; | |
57692c94 | 71 | |
40609d48 EA |
72 | if (size == 0) |
73 | return NULL; | |
57692c94 | 74 | |
40609d48 EA |
75 | bo = kzalloc(sizeof(*bo), GFP_KERNEL); |
76 | if (!bo) | |
77 | return NULL; | |
78 | obj = &bo->base.base; | |
408633d2 | 79 | |
40609d48 EA |
80 | obj->funcs = &v3d_gem_funcs; |
81 | ||
82 | INIT_LIST_HEAD(&bo->unref_head); | |
83 | ||
84 | return &bo->base.base; | |
57692c94 EA |
85 | } |
86 | ||
40609d48 EA |
87 | static int |
88 | v3d_bo_create_finish(struct drm_gem_object *obj) | |
57692c94 | 89 | { |
40609d48 EA |
90 | struct v3d_dev *v3d = to_v3d_dev(obj->dev); |
91 | struct v3d_bo *bo = to_v3d_bo(obj); | |
92 | struct sg_table *sgt; | |
57692c94 EA |
93 | int ret; |
94 | ||
40609d48 EA |
95 | /* So far we pin the BO in the MMU for its lifetime, so use |
96 | * shmem's helper for getting a lifetime sgt. | |
97 | */ | |
98 | sgt = drm_gem_shmem_get_pages_sgt(&bo->base.base); | |
99 | if (IS_ERR(sgt)) | |
100 | return PTR_ERR(sgt); | |
101 | ||
102 | spin_lock(&v3d->mm_lock); | |
103 | /* Allocate the object's space in the GPU's page tables. | |
104 | * Inserting PTEs will happen later, but the offset is for the | |
105 | * lifetime of the BO. | |
106 | */ | |
107 | ret = drm_mm_insert_node_generic(&v3d->mm, &bo->node, | |
108 | obj->size >> PAGE_SHIFT, | |
109 | GMP_GRANULARITY >> PAGE_SHIFT, 0, 0); | |
110 | spin_unlock(&v3d->mm_lock); | |
57692c94 EA |
111 | if (ret) |
112 | return ret; | |
113 | ||
40609d48 EA |
114 | /* Track stats for /debug/dri/n/bo_stats. */ |
115 | mutex_lock(&v3d->bo_lock); | |
116 | v3d->bo_stats.num_allocated++; | |
117 | v3d->bo_stats.pages_allocated += obj->size >> PAGE_SHIFT; | |
118 | mutex_unlock(&v3d->bo_lock); | |
119 | ||
120 | v3d_mmu_insert_ptes(bo); | |
57692c94 | 121 | |
40609d48 | 122 | return 0; |
57692c94 EA |
123 | } |
124 | ||
40609d48 EA |
125 | struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv, |
126 | size_t unaligned_size) | |
57692c94 | 127 | { |
40609d48 EA |
128 | struct drm_gem_shmem_object *shmem_obj; |
129 | struct v3d_bo *bo; | |
57692c94 EA |
130 | int ret; |
131 | ||
40609d48 EA |
132 | shmem_obj = drm_gem_shmem_create(dev, unaligned_size); |
133 | if (!shmem_obj) | |
134 | return NULL; | |
135 | bo = to_v3d_bo(&shmem_obj->base); | |
57692c94 | 136 | |
40609d48 EA |
137 | ret = v3d_bo_create_finish(&shmem_obj->base); |
138 | if (ret) | |
139 | goto free_obj; | |
57692c94 | 140 | |
40609d48 | 141 | return bo; |
57692c94 | 142 | |
40609d48 EA |
143 | free_obj: |
144 | drm_gem_shmem_free_object(&shmem_obj->base); | |
145 | return ERR_PTR(ret); | |
57692c94 EA |
146 | } |
147 | ||
148 | struct drm_gem_object * | |
149 | v3d_prime_import_sg_table(struct drm_device *dev, | |
150 | struct dma_buf_attachment *attach, | |
151 | struct sg_table *sgt) | |
152 | { | |
153 | struct drm_gem_object *obj; | |
40609d48 | 154 | int ret; |
57692c94 | 155 | |
40609d48 EA |
156 | obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt); |
157 | if (IS_ERR(obj)) | |
158 | return obj; | |
cc3f60cf | 159 | |
40609d48 EA |
160 | ret = v3d_bo_create_finish(obj); |
161 | if (ret) { | |
162 | drm_gem_shmem_free_object(obj); | |
163 | return ERR_PTR(ret); | |
164 | } | |
57692c94 EA |
165 | |
166 | return obj; | |
167 | } | |
168 | ||
169 | int v3d_create_bo_ioctl(struct drm_device *dev, void *data, | |
170 | struct drm_file *file_priv) | |
171 | { | |
172 | struct drm_v3d_create_bo *args = data; | |
173 | struct v3d_bo *bo = NULL; | |
174 | int ret; | |
175 | ||
176 | if (args->flags != 0) { | |
177 | DRM_INFO("unknown create_bo flags: %d\n", args->flags); | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | bo = v3d_bo_create(dev, file_priv, PAGE_ALIGN(args->size)); | |
182 | if (IS_ERR(bo)) | |
183 | return PTR_ERR(bo); | |
184 | ||
185 | args->offset = bo->node.start << PAGE_SHIFT; | |
186 | ||
40609d48 EA |
187 | ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle); |
188 | drm_gem_object_put_unlocked(&bo->base.base); | |
57692c94 EA |
189 | |
190 | return ret; | |
191 | } | |
192 | ||
193 | int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data, | |
194 | struct drm_file *file_priv) | |
195 | { | |
196 | struct drm_v3d_mmap_bo *args = data; | |
197 | struct drm_gem_object *gem_obj; | |
57692c94 EA |
198 | |
199 | if (args->flags != 0) { | |
200 | DRM_INFO("unknown mmap_bo flags: %d\n", args->flags); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | gem_obj = drm_gem_object_lookup(file_priv, args->handle); | |
205 | if (!gem_obj) { | |
206 | DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); | |
207 | return -ENOENT; | |
208 | } | |
209 | ||
40609d48 | 210 | args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node); |
57692c94 EA |
211 | drm_gem_object_put_unlocked(gem_obj); |
212 | ||
40609d48 | 213 | return 0; |
57692c94 EA |
214 | } |
215 | ||
216 | int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data, | |
217 | struct drm_file *file_priv) | |
218 | { | |
219 | struct drm_v3d_get_bo_offset *args = data; | |
220 | struct drm_gem_object *gem_obj; | |
221 | struct v3d_bo *bo; | |
222 | ||
223 | gem_obj = drm_gem_object_lookup(file_priv, args->handle); | |
224 | if (!gem_obj) { | |
225 | DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); | |
226 | return -ENOENT; | |
227 | } | |
228 | bo = to_v3d_bo(gem_obj); | |
229 | ||
230 | args->offset = bo->node.start << PAGE_SHIFT; | |
231 | ||
232 | drm_gem_object_put_unlocked(gem_obj); | |
233 | return 0; | |
234 | } |