2 * drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
4 * Copyright (C) 2011 Texas Instruments
5 * Author: Rob Clark <rob.clark@linaro.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
20 #include <linux/dma-buf.h>
24 /* -----------------------------------------------------------------------------
28 static struct sg_table *omap_gem_map_dma_buf(
29 struct dma_buf_attachment *attachment,
30 enum dma_data_direction dir)
32 struct drm_gem_object *obj = attachment->dmabuf->priv;
37 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
39 return ERR_PTR(-ENOMEM);
41 /* camera, etc, need physically contiguous.. but we need a
42 * better way to know this..
44 ret = omap_gem_pin(obj, &dma_addr);
48 ret = sg_alloc_table(sg, 1, GFP_KERNEL);
52 sg_init_table(sg->sgl, 1);
53 sg_dma_len(sg->sgl) = obj->size;
54 sg_set_page(sg->sgl, pfn_to_page(PFN_DOWN(dma_addr)), obj->size, 0);
55 sg_dma_address(sg->sgl) = dma_addr;
57 /* this must be after omap_gem_pin() to ensure we have pages attached */
58 omap_gem_dma_sync_buffer(obj, dir);
66 static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
67 struct sg_table *sg, enum dma_data_direction dir)
69 struct drm_gem_object *obj = attachment->dmabuf->priv;
75 static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
76 enum dma_data_direction dir)
78 struct drm_gem_object *obj = buffer->priv;
80 if (omap_gem_flags(obj) & OMAP_BO_TILED) {
81 /* TODO we would need to pin at least part of the buffer to
82 * get de-tiled view. For now just reject it.
86 /* make sure we have the pages: */
87 return omap_gem_get_pages(obj, &pages, true);
90 static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
91 enum dma_data_direction dir)
93 struct drm_gem_object *obj = buffer->priv;
94 omap_gem_put_pages(obj);
99 static void *omap_gem_dmabuf_kmap_atomic(struct dma_buf *buffer,
100 unsigned long page_num)
102 struct drm_gem_object *obj = buffer->priv;
104 omap_gem_get_pages(obj, &pages, false);
105 omap_gem_cpu_sync_page(obj, page_num);
106 return kmap_atomic(pages[page_num]);
109 static void omap_gem_dmabuf_kunmap_atomic(struct dma_buf *buffer,
110 unsigned long page_num, void *addr)
115 static void *omap_gem_dmabuf_kmap(struct dma_buf *buffer,
116 unsigned long page_num)
118 struct drm_gem_object *obj = buffer->priv;
120 omap_gem_get_pages(obj, &pages, false);
121 omap_gem_cpu_sync_page(obj, page_num);
122 return kmap(pages[page_num]);
125 static void omap_gem_dmabuf_kunmap(struct dma_buf *buffer,
126 unsigned long page_num, void *addr)
128 struct drm_gem_object *obj = buffer->priv;
130 omap_gem_get_pages(obj, &pages, false);
131 kunmap(pages[page_num]);
134 static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
135 struct vm_area_struct *vma)
137 struct drm_gem_object *obj = buffer->priv;
140 ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma);
144 return omap_gem_mmap_obj(obj, vma);
147 static const struct dma_buf_ops omap_dmabuf_ops = {
148 .map_dma_buf = omap_gem_map_dma_buf,
149 .unmap_dma_buf = omap_gem_unmap_dma_buf,
150 .release = drm_gem_dmabuf_release,
151 .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access,
152 .end_cpu_access = omap_gem_dmabuf_end_cpu_access,
153 .map_atomic = omap_gem_dmabuf_kmap_atomic,
154 .unmap_atomic = omap_gem_dmabuf_kunmap_atomic,
155 .map = omap_gem_dmabuf_kmap,
156 .unmap = omap_gem_dmabuf_kunmap,
157 .mmap = omap_gem_dmabuf_mmap,
160 struct dma_buf *omap_gem_prime_export(struct drm_device *dev,
161 struct drm_gem_object *obj, int flags)
163 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
165 exp_info.ops = &omap_dmabuf_ops;
166 exp_info.size = obj->size;
167 exp_info.flags = flags;
170 return drm_gem_dmabuf_export(dev, &exp_info);
173 /* -----------------------------------------------------------------------------
177 struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
178 struct dma_buf *dma_buf)
180 struct dma_buf_attachment *attach;
181 struct drm_gem_object *obj;
182 struct sg_table *sgt;
185 if (dma_buf->ops == &omap_dmabuf_ops) {
187 if (obj->dev == dev) {
189 * Importing dmabuf exported from out own gem increases
190 * refcount on gem itself instead of f_count of dmabuf.
192 drm_gem_object_reference(obj);
197 attach = dma_buf_attach(dma_buf, dev->dev);
199 return ERR_CAST(attach);
201 get_dma_buf(dma_buf);
203 sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
209 obj = omap_gem_new_dmabuf(dev, dma_buf->size, sgt);
215 obj->import_attach = attach;
220 dma_buf_unmap_attachment(attach, sgt, DMA_TO_DEVICE);
222 dma_buf_detach(dma_buf, attach);
223 dma_buf_put(dma_buf);