3 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
27 #include <drm/exynos_drm.h>
28 #include "exynos_drm_drv.h"
29 #include "exynos_drm_gem.h"
31 #include <linux/dma-buf.h>
33 static struct sg_table *exynos_pages_to_sg(struct page **pages, int nr_pages,
34 unsigned int page_size)
36 struct sg_table *sgt = NULL;
37 struct scatterlist *sgl;
40 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
44 ret = sg_alloc_table(sgt, nr_pages, GFP_KERNEL);
48 if (page_size < PAGE_SIZE)
49 page_size = PAGE_SIZE;
51 for_each_sg(sgt->sgl, sgl, nr_pages, i)
52 sg_set_page(sgl, pages[i], page_size, 0);
63 static struct sg_table *
64 exynos_gem_map_dma_buf(struct dma_buf_attachment *attach,
65 enum dma_data_direction dir)
67 struct exynos_drm_gem_obj *gem_obj = attach->dmabuf->priv;
68 struct drm_device *dev = gem_obj->base.dev;
69 struct exynos_drm_gem_buf *buf;
70 struct sg_table *sgt = NULL;
74 DRM_DEBUG_PRIME("%s\n", __FILE__);
76 mutex_lock(&dev->struct_mutex);
78 buf = gem_obj->buffer;
80 /* there should always be pages allocated. */
82 DRM_ERROR("pages is null.\n");
86 npages = buf->size / buf->page_size;
88 sgt = exynos_pages_to_sg(buf->pages, npages, buf->page_size);
90 DRM_DEBUG_PRIME("exynos_pages_to_sg returned NULL!\n");
93 nents = dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir);
95 DRM_DEBUG_PRIME("npages = %d buffer size = 0x%lx page_size = 0x%lx\n",
96 npages, buf->size, buf->page_size);
99 mutex_unlock(&dev->struct_mutex);
103 static void exynos_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
104 struct sg_table *sgt,
105 enum dma_data_direction dir)
107 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
113 static void exynos_dmabuf_release(struct dma_buf *dmabuf)
115 struct exynos_drm_gem_obj *exynos_gem_obj = dmabuf->priv;
117 DRM_DEBUG_PRIME("%s\n", __FILE__);
120 * exynos_dmabuf_release() call means that file object's
121 * f_count is 0 and it calls drm_gem_object_handle_unreference()
122 * to drop the references that these values had been increased
123 * at drm_prime_handle_to_fd()
125 if (exynos_gem_obj->base.export_dma_buf == dmabuf) {
126 exynos_gem_obj->base.export_dma_buf = NULL;
129 * drop this gem object refcount to release allocated buffer
132 drm_gem_object_unreference_unlocked(&exynos_gem_obj->base);
136 static void *exynos_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
137 unsigned long page_num)
144 static void exynos_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
145 unsigned long page_num,
151 static void *exynos_gem_dmabuf_kmap(struct dma_buf *dma_buf,
152 unsigned long page_num)
159 static void exynos_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
160 unsigned long page_num, void *addr)
165 static int exynos_gem_dmabuf_mmap(struct dma_buf *dma_buf,
166 struct vm_area_struct *vma)
171 static struct dma_buf_ops exynos_dmabuf_ops = {
172 .map_dma_buf = exynos_gem_map_dma_buf,
173 .unmap_dma_buf = exynos_gem_unmap_dma_buf,
174 .kmap = exynos_gem_dmabuf_kmap,
175 .kmap_atomic = exynos_gem_dmabuf_kmap_atomic,
176 .kunmap = exynos_gem_dmabuf_kunmap,
177 .kunmap_atomic = exynos_gem_dmabuf_kunmap_atomic,
178 .mmap = exynos_gem_dmabuf_mmap,
179 .release = exynos_dmabuf_release,
182 struct dma_buf *exynos_dmabuf_prime_export(struct drm_device *drm_dev,
183 struct drm_gem_object *obj, int flags)
185 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
187 return dma_buf_export(exynos_gem_obj, &exynos_dmabuf_ops,
188 exynos_gem_obj->base.size, 0600);
191 struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
192 struct dma_buf *dma_buf)
194 struct dma_buf_attachment *attach;
195 struct sg_table *sgt;
196 struct scatterlist *sgl;
197 struct exynos_drm_gem_obj *exynos_gem_obj;
198 struct exynos_drm_gem_buf *buffer;
202 DRM_DEBUG_PRIME("%s\n", __FILE__);
204 /* is this one of own objects? */
205 if (dma_buf->ops == &exynos_dmabuf_ops) {
206 struct drm_gem_object *obj;
208 exynos_gem_obj = dma_buf->priv;
209 obj = &exynos_gem_obj->base;
211 /* is it from our device? */
212 if (obj->dev == drm_dev) {
213 drm_gem_object_reference(obj);
218 attach = dma_buf_attach(dma_buf, drm_dev->dev);
220 return ERR_PTR(-EINVAL);
223 sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
224 if (IS_ERR_OR_NULL(sgt)) {
229 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
231 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
233 goto err_unmap_attach;
236 buffer->pages = kzalloc(sizeof(*page) * sgt->nents, GFP_KERNEL);
237 if (!buffer->pages) {
238 DRM_ERROR("failed to allocate pages.\n");
240 goto err_free_buffer;
243 exynos_gem_obj = exynos_drm_gem_init(drm_dev, dma_buf->size);
244 if (!exynos_gem_obj) {
251 if (sgt->nents == 1) {
252 buffer->dma_addr = sg_dma_address(sgt->sgl);
253 buffer->size = sg_dma_len(sgt->sgl);
255 /* always physically continuous memory if sgt->nents is 1. */
256 exynos_gem_obj->flags |= EXYNOS_BO_CONTIG;
260 buffer->dma_addr = sg_dma_address(sgl);
261 while (i < sgt->nents) {
262 buffer->pages[i] = sg_page(sgl);
263 buffer->size += sg_dma_len(sgl);
268 exynos_gem_obj->flags |= EXYNOS_BO_NONCONTIG;
271 exynos_gem_obj->buffer = buffer;
273 exynos_gem_obj->base.import_attach = attach;
275 DRM_DEBUG_PRIME("dma_addr = 0x%x, size = 0x%lx\n", buffer->dma_addr,
278 return &exynos_gem_obj->base;
281 kfree(buffer->pages);
282 buffer->pages = NULL;
287 dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
289 dma_buf_detach(dma_buf, attach);
293 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
294 MODULE_DESCRIPTION("Samsung SoC DRM DMABUF Module");
295 MODULE_LICENSE("GPL");