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,
28 struct drm_gem_object *obj = &rk_obj->base;
29 struct drm_device *drm = obj->dev;
31 init_dma_attrs(&rk_obj->dma_attrs);
32 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
35 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
37 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
38 &rk_obj->dma_addr, GFP_KERNEL,
40 if (!rk_obj->kvaddr) {
41 DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size);
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 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
58 struct vm_area_struct *vma)
62 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
63 struct drm_device *drm = obj->dev;
66 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
67 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
69 vma->vm_flags &= ~VM_PFNMAP;
72 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
73 obj->size, &rk_obj->dma_attrs);
75 drm_gem_vm_close(vma);
80 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
81 struct vm_area_struct *vma)
85 ret = drm_gem_mmap_obj(obj, obj->size, vma);
89 return rockchip_drm_gem_object_mmap(obj, vma);
92 /* drm driver mmap file operations */
93 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
95 struct drm_gem_object *obj;
98 ret = drm_gem_mmap(filp, vma);
102 obj = vma->vm_private_data;
104 return rockchip_drm_gem_object_mmap(obj, vma);
107 struct rockchip_gem_object *
108 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, alloc_kmap);
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, false);
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 obj = drm_gem_object_lookup(dev, file_priv, handle);
203 DRM_ERROR("failed to lookup gem object.\n");
207 ret = drm_gem_create_mmap_offset(obj);
211 *offset = drm_vma_node_offset_addr(&obj->vma_node);
212 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
215 drm_gem_object_unreference_unlocked(obj);
221 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
224 * This aligns the pitch and size arguments to the minimum required. wrap
225 * this into your own function if you need bigger alignment.
227 int rockchip_gem_dumb_create(struct drm_file *file_priv,
228 struct drm_device *dev,
229 struct drm_mode_create_dumb *args)
231 struct rockchip_gem_object *rk_obj;
232 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
235 * align to 64 bytes since Mali requires it.
237 args->pitch = ALIGN(min_pitch, 64);
238 args->size = args->pitch * args->height;
240 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
243 return PTR_ERR_OR_ZERO(rk_obj);
247 * Allocate a sg_table for this GEM object.
248 * Note: Both the table's contents, and the sg_table itself must be freed by
250 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
252 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
254 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
255 struct drm_device *drm = obj->dev;
256 struct sg_table *sgt;
259 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
261 return ERR_PTR(-ENOMEM);
263 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
264 rk_obj->dma_addr, obj->size,
267 DRM_ERROR("failed to allocate sgt, %d\n", ret);
275 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
277 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
279 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
282 return rk_obj->kvaddr;
285 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)