2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
17 #include <drm/drm_gem.h>
18 #include <drm/drm_vma_manager.h>
20 #include <linux/dma-attrs.h>
22 #include "rockchip_drm_drv.h"
23 #include "rockchip_drm_gem.h"
25 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj)
27 struct drm_gem_object *obj = &rk_obj->base;
28 struct drm_device *drm = obj->dev;
30 init_dma_attrs(&rk_obj->dma_attrs);
31 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
33 /* TODO(djkurtz): Use DMA_ATTR_NO_KERNEL_MAPPING except for fbdev */
34 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
35 &rk_obj->dma_addr, GFP_KERNEL,
37 if (IS_ERR(rk_obj->kvaddr)) {
38 int ret = PTR_ERR(rk_obj->kvaddr);
40 DRM_ERROR("failed to allocate %#x byte dma buffer, %d",
48 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
50 struct drm_gem_object *obj = &rk_obj->base;
51 struct drm_device *drm = obj->dev;
53 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
57 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
58 struct vm_area_struct *vma)
60 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
61 struct drm_device *drm = obj->dev;
62 unsigned long vm_size;
64 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
65 vm_size = vma->vm_end - vma->vm_start;
67 if (vm_size > obj->size)
70 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
71 obj->size, &rk_obj->dma_attrs);
74 /* drm driver mmap file operations */
75 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
77 struct drm_file *priv = filp->private_data;
78 struct drm_device *dev = priv->minor->dev;
79 struct drm_gem_object *obj;
80 struct drm_vma_offset_node *node;
83 if (drm_device_is_unplugged(dev))
86 mutex_lock(&dev->struct_mutex);
88 node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
92 mutex_unlock(&dev->struct_mutex);
93 DRM_ERROR("failed to find vma node.\n");
95 } else if (!drm_vma_node_is_allowed(node, filp)) {
96 mutex_unlock(&dev->struct_mutex);
100 obj = container_of(node, struct drm_gem_object, vma_node);
101 ret = rockchip_gem_mmap_buf(obj, vma);
103 mutex_unlock(&dev->struct_mutex);
108 struct rockchip_gem_object *
109 rockchip_gem_create_object(struct drm_device *drm, unsigned int size)
111 struct rockchip_gem_object *rk_obj;
112 struct drm_gem_object *obj;
115 size = round_up(size, PAGE_SIZE);
117 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
119 return ERR_PTR(-ENOMEM);
123 drm_gem_private_object_init(drm, obj, size);
125 ret = rockchip_gem_alloc_buf(rk_obj);
127 goto err_free_rk_obj;
137 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
140 void rockchip_gem_free_object(struct drm_gem_object *obj)
142 struct rockchip_gem_object *rk_obj;
144 drm_gem_free_mmap_offset(obj);
146 rk_obj = to_rockchip_obj(obj);
148 rockchip_gem_free_buf(rk_obj);
154 * rockchip_gem_create_with_handle - allocate an object with the given
155 * size and create a gem handle on it
157 * returns a struct rockchip_gem_object* on success or ERR_PTR values
160 static struct rockchip_gem_object *
161 rockchip_gem_create_with_handle(struct drm_file *file_priv,
162 struct drm_device *drm, unsigned int size,
163 unsigned int *handle)
165 struct rockchip_gem_object *rk_obj;
166 struct drm_gem_object *obj;
169 rk_obj = rockchip_gem_create_object(drm, size);
171 return ERR_CAST(rk_obj);
176 * allocate a id of idr table where the obj is registered
177 * and handle has the id what user can see.
179 ret = drm_gem_handle_create(file_priv, obj, handle);
181 goto err_handle_create;
183 /* drop reference from allocate - handle holds it now. */
184 drm_gem_object_unreference_unlocked(obj);
189 rockchip_gem_free_object(obj);
194 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
195 struct drm_device *dev, uint32_t handle,
198 struct drm_gem_object *obj;
201 mutex_lock(&dev->struct_mutex);
203 obj = drm_gem_object_lookup(dev, file_priv, handle);
205 DRM_ERROR("failed to lookup gem object.\n");
210 ret = drm_gem_create_mmap_offset(obj);
214 *offset = drm_vma_node_offset_addr(&obj->vma_node);
215 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
218 drm_gem_object_unreference(obj);
220 mutex_unlock(&dev->struct_mutex);
225 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
228 * This aligns the pitch and size arguments to the minimum required. wrap
229 * this into your own function if you need bigger alignment.
231 int rockchip_gem_dumb_create(struct drm_file *file_priv,
232 struct drm_device *dev,
233 struct drm_mode_create_dumb *args)
235 struct rockchip_gem_object *rk_obj;
236 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
239 * align to 64 bytes since Mali requires it.
241 min_pitch = ALIGN(min_pitch, 64);
243 if (args->pitch < min_pitch)
244 args->pitch = min_pitch;
246 if (args->size < args->pitch * args->height)
247 args->size = args->pitch * args->height;
249 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
252 return PTR_ERR_OR_ZERO(rk_obj);
256 * Allocate a sg_table for this GEM object.
257 * Note: Both the table's contents, and the sg_table itself must be freed by
259 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
261 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
263 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
264 struct drm_device *drm = obj->dev;
265 struct sg_table *sgt;
268 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
270 return ERR_PTR(-ENOMEM);
272 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
273 rk_obj->dma_addr, obj->size,
276 DRM_ERROR("failed to allocate sgt, %d\n", ret);
284 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
286 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
288 return rk_obj->kvaddr;
291 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)