Commit | Line | Data |
---|---|---|
1286ff73 | 1 | /* |
10be98a7 | 2 | * SPDX-License-Identifier: MIT |
1286ff73 | 3 | * |
10be98a7 | 4 | * Copyright 2012 Red Hat Inc |
1286ff73 | 5 | */ |
ad778f89 CW |
6 | |
7 | #include <linux/dma-buf.h> | |
10be98a7 | 8 | #include <linux/highmem.h> |
52791eee | 9 | #include <linux/dma-resv.h> |
ad778f89 | 10 | |
1286ff73 | 11 | #include "i915_drv.h" |
10be98a7 | 12 | #include "i915_gem_object.h" |
37d63f8f | 13 | #include "i915_scatterlist.h" |
1286ff73 | 14 | |
608806a5 DV |
15 | static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf) |
16 | { | |
17 | return to_intel_bo(buf->priv); | |
18 | } | |
19 | ||
6a101cb2 | 20 | static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
9da3da66 | 21 | enum dma_data_direction dir) |
1286ff73 | 22 | { |
608806a5 | 23 | struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); |
9da3da66 CW |
24 | struct sg_table *st; |
25 | struct scatterlist *src, *dst; | |
26 | int ret, i; | |
1286ff73 | 27 | |
a4f5ea64 | 28 | ret = i915_gem_object_pin_pages(obj); |
5cfacded | 29 | if (ret) |
7dd737f3 | 30 | goto err; |
5cfacded | 31 | |
9da3da66 CW |
32 | /* Copy sg so that we make an independent mapping */ |
33 | st = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
34 | if (st == NULL) { | |
5cfacded | 35 | ret = -ENOMEM; |
7dd737f3 | 36 | goto err_unpin_pages; |
1286ff73 DV |
37 | } |
38 | ||
a4f5ea64 | 39 | ret = sg_alloc_table(st, obj->mm.pages->nents, GFP_KERNEL); |
5cfacded CW |
40 | if (ret) |
41 | goto err_free; | |
9da3da66 | 42 | |
a4f5ea64 | 43 | src = obj->mm.pages->sgl; |
9da3da66 | 44 | dst = st->sgl; |
a4f5ea64 | 45 | for (i = 0; i < obj->mm.pages->nents; i++) { |
67d5a50c | 46 | sg_set_page(dst, sg_page(src), src->length, 0); |
9da3da66 CW |
47 | dst = sg_next(dst); |
48 | src = sg_next(src); | |
49 | } | |
50 | ||
51 | if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { | |
7dd737f3 | 52 | ret = -ENOMEM; |
5cfacded | 53 | goto err_free_sg; |
1286ff73 DV |
54 | } |
55 | ||
9da3da66 | 56 | return st; |
5cfacded CW |
57 | |
58 | err_free_sg: | |
59 | sg_free_table(st); | |
60 | err_free: | |
61 | kfree(st); | |
7dd737f3 | 62 | err_unpin_pages: |
5cfacded | 63 | i915_gem_object_unpin_pages(obj); |
5cfacded CW |
64 | err: |
65 | return ERR_PTR(ret); | |
1286ff73 DV |
66 | } |
67 | ||
6a101cb2 | 68 | static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
2f745ad3 CW |
69 | struct sg_table *sg, |
70 | enum dma_data_direction dir) | |
1286ff73 | 71 | { |
608806a5 | 72 | struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); |
f214266c | 73 | |
1286ff73 DV |
74 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); |
75 | sg_free_table(sg); | |
76 | kfree(sg); | |
f214266c DV |
77 | |
78 | i915_gem_object_unpin_pages(obj); | |
1286ff73 DV |
79 | } |
80 | ||
9a70cc2a DA |
81 | static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
82 | { | |
608806a5 | 83 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
9a70cc2a | 84 | |
7dd737f3 | 85 | return i915_gem_object_pin_map(obj, I915_MAP_WB); |
9a70cc2a DA |
86 | } |
87 | ||
88 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
89 | { | |
608806a5 | 90 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
9a70cc2a | 91 | |
a679f58d | 92 | i915_gem_object_flush_map(obj); |
0a798eb9 | 93 | i915_gem_object_unpin_map(obj); |
9a70cc2a DA |
94 | } |
95 | ||
1286ff73 DV |
96 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) |
97 | { | |
c944a308 CW |
98 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
99 | struct page *page; | |
100 | ||
101 | if (page_num >= obj->base.size >> PAGE_SHIFT) | |
102 | return NULL; | |
103 | ||
104 | if (!i915_gem_object_has_struct_page(obj)) | |
105 | return NULL; | |
106 | ||
107 | if (i915_gem_object_pin_pages(obj)) | |
108 | return NULL; | |
109 | ||
110 | /* Synchronisation is left to the caller (via .begin_cpu_access()) */ | |
111 | page = i915_gem_object_get_page(obj, page_num); | |
112 | if (IS_ERR(page)) | |
113 | goto err_unpin; | |
114 | ||
115 | return kmap(page); | |
116 | ||
117 | err_unpin: | |
118 | i915_gem_object_unpin_pages(obj); | |
1286ff73 DV |
119 | return NULL; |
120 | } | |
121 | ||
122 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
123 | { | |
c944a308 | 124 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
1286ff73 | 125 | |
c944a308 CW |
126 | kunmap(virt_to_page(addr)); |
127 | i915_gem_object_unpin_pages(obj); | |
1286ff73 DV |
128 | } |
129 | ||
2dad9d4d DA |
130 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
131 | { | |
2dbf0d90 TV |
132 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
133 | int ret; | |
134 | ||
135 | if (obj->base.size < vma->vm_end - vma->vm_start) | |
136 | return -EINVAL; | |
137 | ||
138 | if (!obj->base.filp) | |
139 | return -ENODEV; | |
140 | ||
f74ac015 | 141 | ret = call_mmap(obj->base.filp, vma); |
2dbf0d90 TV |
142 | if (ret) |
143 | return ret; | |
144 | ||
145 | fput(vma->vm_file); | |
146 | vma->vm_file = get_file(obj->base.filp); | |
147 | ||
148 | return 0; | |
2dad9d4d DA |
149 | } |
150 | ||
831e9da7 | 151 | static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) |
ec6f1bb9 | 152 | { |
608806a5 | 153 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
ec6f1bb9 | 154 | bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); |
7dd737f3 | 155 | int err; |
ec6f1bb9 | 156 | |
7dd737f3 CW |
157 | err = i915_gem_object_pin_pages(obj); |
158 | if (err) | |
159 | return err; | |
160 | ||
6951e589 | 161 | err = i915_gem_object_lock_interruptible(obj); |
7dd737f3 CW |
162 | if (err) |
163 | goto out; | |
ec6f1bb9 | 164 | |
7dd737f3 | 165 | err = i915_gem_object_set_to_cpu_domain(obj, write); |
6951e589 | 166 | i915_gem_object_unlock(obj); |
7dd737f3 CW |
167 | |
168 | out: | |
169 | i915_gem_object_unpin_pages(obj); | |
170 | return err; | |
ec6f1bb9 DA |
171 | } |
172 | ||
18b862dc | 173 | static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) |
346400c8 TV |
174 | { |
175 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); | |
7dd737f3 | 176 | int err; |
346400c8 | 177 | |
7dd737f3 CW |
178 | err = i915_gem_object_pin_pages(obj); |
179 | if (err) | |
180 | return err; | |
181 | ||
6951e589 | 182 | err = i915_gem_object_lock_interruptible(obj); |
7dd737f3 CW |
183 | if (err) |
184 | goto out; | |
346400c8 | 185 | |
7dd737f3 | 186 | err = i915_gem_object_set_to_gtt_domain(obj, false); |
6951e589 | 187 | i915_gem_object_unlock(obj); |
346400c8 | 188 | |
7dd737f3 CW |
189 | out: |
190 | i915_gem_object_unpin_pages(obj); | |
191 | return err; | |
346400c8 TV |
192 | } |
193 | ||
6a101cb2 | 194 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
195 | .map_dma_buf = i915_gem_map_dma_buf, |
196 | .unmap_dma_buf = i915_gem_unmap_dma_buf, | |
c1d6798d | 197 | .release = drm_gem_dmabuf_release, |
f9b67f00 | 198 | .map = i915_gem_dmabuf_kmap, |
f9b67f00 | 199 | .unmap = i915_gem_dmabuf_kunmap, |
2dad9d4d | 200 | .mmap = i915_gem_dmabuf_mmap, |
9a70cc2a DA |
201 | .vmap = i915_gem_dmabuf_vmap, |
202 | .vunmap = i915_gem_dmabuf_vunmap, | |
ec6f1bb9 | 203 | .begin_cpu_access = i915_gem_begin_cpu_access, |
346400c8 | 204 | .end_cpu_access = i915_gem_end_cpu_access, |
1286ff73 DV |
205 | }; |
206 | ||
d8080976 | 207 | struct dma_buf *i915_gem_prime_export(struct drm_gem_object *gem_obj, int flags) |
1286ff73 | 208 | { |
5cc9ed4b | 209 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); |
d8fbe341 SS |
210 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
211 | ||
212 | exp_info.ops = &i915_dmabuf_ops; | |
213 | exp_info.size = gem_obj->size; | |
214 | exp_info.flags = flags; | |
215 | exp_info.priv = gem_obj; | |
ef78f7b1 | 216 | exp_info.resv = obj->base.resv; |
d8fbe341 | 217 | |
5cc9ed4b CW |
218 | if (obj->ops->dmabuf_export) { |
219 | int ret = obj->ops->dmabuf_export(obj); | |
220 | if (ret) | |
221 | return ERR_PTR(ret); | |
222 | } | |
223 | ||
d8080976 | 224 | return drm_gem_dmabuf_export(gem_obj->dev, &exp_info); |
1286ff73 DV |
225 | } |
226 | ||
b91b09ee | 227 | static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) |
2f745ad3 | 228 | { |
b91b09ee | 229 | struct sg_table *pages; |
84e8978e | 230 | unsigned int sg_page_sizes; |
b91b09ee MA |
231 | |
232 | pages = dma_buf_map_attachment(obj->base.import_attach, | |
233 | DMA_BIDIRECTIONAL); | |
234 | if (IS_ERR(pages)) | |
235 | return PTR_ERR(pages); | |
236 | ||
84e8978e | 237 | sg_page_sizes = i915_sg_page_sizes(pages->sgl); |
a5c08166 | 238 | |
84e8978e | 239 | __i915_gem_object_set_pages(obj, pages, sg_page_sizes); |
b91b09ee MA |
240 | |
241 | return 0; | |
1286ff73 DV |
242 | } |
243 | ||
03ac84f1 CW |
244 | static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj, |
245 | struct sg_table *pages) | |
2f745ad3 | 246 | { |
03ac84f1 CW |
247 | dma_buf_unmap_attachment(obj->base.import_attach, pages, |
248 | DMA_BIDIRECTIONAL); | |
2f745ad3 CW |
249 | } |
250 | ||
251 | static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = { | |
252 | .get_pages = i915_gem_object_get_pages_dmabuf, | |
253 | .put_pages = i915_gem_object_put_pages_dmabuf, | |
254 | }; | |
255 | ||
1286ff73 | 256 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
9da3da66 | 257 | struct dma_buf *dma_buf) |
1286ff73 DV |
258 | { |
259 | struct dma_buf_attachment *attach; | |
1286ff73 | 260 | struct drm_i915_gem_object *obj; |
1286ff73 DV |
261 | int ret; |
262 | ||
263 | /* is this one of own objects? */ | |
264 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
608806a5 | 265 | obj = dma_buf_to_obj(dma_buf); |
1286ff73 DV |
266 | /* is it from our device? */ |
267 | if (obj->base.dev == dev) { | |
be8a42ae SWK |
268 | /* |
269 | * Importing dmabuf exported from out own gem increases | |
270 | * refcount on gem itself instead of f_count of dmabuf. | |
271 | */ | |
25dc556a | 272 | return &i915_gem_object_get(obj)->base; |
1286ff73 DV |
273 | } |
274 | } | |
275 | ||
276 | /* need to attach */ | |
277 | attach = dma_buf_attach(dma_buf, dev->dev); | |
278 | if (IS_ERR(attach)) | |
279 | return ERR_CAST(attach); | |
280 | ||
011c2282 ID |
281 | get_dma_buf(dma_buf); |
282 | ||
13f1bfd3 | 283 | obj = i915_gem_object_alloc(); |
1286ff73 DV |
284 | if (obj == NULL) { |
285 | ret = -ENOMEM; | |
2f745ad3 | 286 | goto fail_detach; |
1286ff73 DV |
287 | } |
288 | ||
89c8233f | 289 | drm_gem_private_object_init(dev, &obj->base, dma_buf->size); |
2f745ad3 | 290 | i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops); |
1286ff73 | 291 | obj->base.import_attach = attach; |
ef78f7b1 | 292 | obj->base.resv = dma_buf->resv; |
1286ff73 | 293 | |
30bc06c0 CW |
294 | /* We use GTT as shorthand for a coherent domain, one that is |
295 | * neither in the GPU cache nor in the CPU cache, where all | |
296 | * writes are immediately visible in memory. (That's not strictly | |
297 | * true, but it's close! There are internal buffers such as the | |
298 | * write-combined buffer or a delay through the chipset for GTT | |
299 | * writes that do require us to treat GTT as a separate cache domain.) | |
300 | */ | |
c0a51fd0 CK |
301 | obj->read_domains = I915_GEM_DOMAIN_GTT; |
302 | obj->write_domain = 0; | |
30bc06c0 | 303 | |
1286ff73 DV |
304 | return &obj->base; |
305 | ||
1286ff73 DV |
306 | fail_detach: |
307 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
308 | dma_buf_put(dma_buf); |
309 | ||
1286ff73 DV |
310 | return ERR_PTR(ret); |
311 | } | |
6cca22ed CW |
312 | |
313 | #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) | |
314 | #include "selftests/mock_dmabuf.c" | |
315 | #include "selftests/i915_gem_dmabuf.c" | |
316 | #endif |