2 * Copyright 2011 Red Hat Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
22 * Authors: Dave Airlie
25 #include <linux/dma-buf.h>
29 #include "nouveau_drm.h"
30 #include "nouveau_gem.h"
32 static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
33 enum dma_data_direction dir)
35 struct nouveau_bo *nvbo = attachment->dmabuf->priv;
36 struct drm_device *dev = nvbo->gem->dev;
37 int npages = nvbo->bo.num_pages;
41 mutex_lock(&dev->struct_mutex);
42 sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
43 nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
44 mutex_unlock(&dev->struct_mutex);
48 static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
49 struct sg_table *sg, enum dma_data_direction dir)
51 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
56 static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
58 struct nouveau_bo *nvbo = dma_buf->priv;
60 if (nvbo->gem->export_dma_buf == dma_buf) {
61 nvbo->gem->export_dma_buf = NULL;
62 drm_gem_object_unreference_unlocked(nvbo->gem);
66 static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
71 static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
75 static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
80 static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
85 static int nouveau_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
90 static void *nouveau_gem_prime_vmap(struct dma_buf *dma_buf)
92 struct nouveau_bo *nvbo = dma_buf->priv;
93 struct drm_device *dev = nvbo->gem->dev;
96 mutex_lock(&dev->struct_mutex);
97 if (nvbo->vmapping_count) {
98 nvbo->vmapping_count++;
102 ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
103 &nvbo->dma_buf_vmap);
105 mutex_unlock(&dev->struct_mutex);
108 nvbo->vmapping_count = 1;
110 mutex_unlock(&dev->struct_mutex);
111 return nvbo->dma_buf_vmap.virtual;
114 static void nouveau_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr)
116 struct nouveau_bo *nvbo = dma_buf->priv;
117 struct drm_device *dev = nvbo->gem->dev;
119 mutex_lock(&dev->struct_mutex);
120 nvbo->vmapping_count--;
121 if (nvbo->vmapping_count == 0) {
122 ttm_bo_kunmap(&nvbo->dma_buf_vmap);
124 mutex_unlock(&dev->struct_mutex);
127 static const struct dma_buf_ops nouveau_dmabuf_ops = {
128 .map_dma_buf = nouveau_gem_map_dma_buf,
129 .unmap_dma_buf = nouveau_gem_unmap_dma_buf,
130 .release = nouveau_gem_dmabuf_release,
131 .kmap = nouveau_gem_kmap,
132 .kmap_atomic = nouveau_gem_kmap_atomic,
133 .kunmap = nouveau_gem_kunmap,
134 .kunmap_atomic = nouveau_gem_kunmap_atomic,
135 .mmap = nouveau_gem_prime_mmap,
136 .vmap = nouveau_gem_prime_vmap,
137 .vunmap = nouveau_gem_prime_vunmap,
141 nouveau_prime_new(struct drm_device *dev,
144 struct nouveau_bo **pnvbo)
146 struct nouveau_bo *nvbo;
150 flags = TTM_PL_FLAG_TT;
152 ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
158 /* we restrict allowed domains on nv50+ to only the types
159 * that were requested at creation time. not possibly on
160 * earlier chips without busting the ABI.
162 nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
163 nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
165 nouveau_bo_ref(NULL, pnvbo);
169 nvbo->gem->driver_private = nvbo;
173 struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
174 struct drm_gem_object *obj, int flags)
176 struct nouveau_bo *nvbo = nouveau_gem_object(obj);
179 /* pin buffer into GTT */
180 ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
182 return ERR_PTR(-EINVAL);
184 return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
187 struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
188 struct dma_buf *dma_buf)
190 struct dma_buf_attachment *attach;
192 struct nouveau_bo *nvbo;
195 if (dma_buf->ops == &nouveau_dmabuf_ops) {
196 nvbo = dma_buf->priv;
198 if (nvbo->gem->dev == dev) {
199 drm_gem_object_reference(nvbo->gem);
205 attach = dma_buf_attach(dma_buf, dev->dev);
207 return ERR_PTR(PTR_ERR(attach));
209 sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
215 ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
219 nvbo->gem->import_attach = attach;
224 dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
226 dma_buf_detach(dma_buf, attach);