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;
71 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
72 obj->size, &rk_obj->dma_attrs);
74 drm_gem_vm_close(vma);
79 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
80 struct vm_area_struct *vma)
84 ret = drm_gem_mmap_obj(obj, obj->size, vma);
88 return rockchip_drm_gem_object_mmap(obj, vma);
91 /* drm driver mmap file operations */
92 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
94 struct drm_gem_object *obj;
97 ret = drm_gem_mmap(filp, vma);
102 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
103 * whole buffer from the start.
107 obj = vma->vm_private_data;
109 return rockchip_drm_gem_object_mmap(obj, vma);
112 struct rockchip_gem_object *
113 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
116 struct rockchip_gem_object *rk_obj;
117 struct drm_gem_object *obj;
120 size = round_up(size, PAGE_SIZE);
122 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
124 return ERR_PTR(-ENOMEM);
128 drm_gem_private_object_init(drm, obj, size);
130 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
132 goto err_free_rk_obj;
142 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
145 void rockchip_gem_free_object(struct drm_gem_object *obj)
147 struct rockchip_gem_object *rk_obj;
149 drm_gem_free_mmap_offset(obj);
151 rk_obj = to_rockchip_obj(obj);
153 rockchip_gem_free_buf(rk_obj);
159 * rockchip_gem_create_with_handle - allocate an object with the given
160 * size and create a gem handle on it
162 * returns a struct rockchip_gem_object* on success or ERR_PTR values
165 static struct rockchip_gem_object *
166 rockchip_gem_create_with_handle(struct drm_file *file_priv,
167 struct drm_device *drm, unsigned int size,
168 unsigned int *handle)
170 struct rockchip_gem_object *rk_obj;
171 struct drm_gem_object *obj;
174 rk_obj = rockchip_gem_create_object(drm, size, false);
176 return ERR_CAST(rk_obj);
181 * allocate a id of idr table where the obj is registered
182 * and handle has the id what user can see.
184 ret = drm_gem_handle_create(file_priv, obj, handle);
186 goto err_handle_create;
188 /* drop reference from allocate - handle holds it now. */
189 drm_gem_object_unreference_unlocked(obj);
194 rockchip_gem_free_object(obj);
199 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
200 struct drm_device *dev, uint32_t handle,
203 struct drm_gem_object *obj;
206 obj = drm_gem_object_lookup(dev, file_priv, handle);
208 DRM_ERROR("failed to lookup gem object.\n");
212 ret = drm_gem_create_mmap_offset(obj);
216 *offset = drm_vma_node_offset_addr(&obj->vma_node);
217 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
220 drm_gem_object_unreference_unlocked(obj);
226 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
229 * This aligns the pitch and size arguments to the minimum required. wrap
230 * this into your own function if you need bigger alignment.
232 int rockchip_gem_dumb_create(struct drm_file *file_priv,
233 struct drm_device *dev,
234 struct drm_mode_create_dumb *args)
236 struct rockchip_gem_object *rk_obj;
237 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
240 * align to 64 bytes since Mali requires it.
242 min_pitch = ALIGN(min_pitch, 64);
244 if (args->pitch < min_pitch)
245 args->pitch = min_pitch;
247 if (args->size < args->pitch * args->height)
248 args->size = args->pitch * args->height;
250 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
253 return PTR_ERR_OR_ZERO(rk_obj);
257 * Allocate a sg_table for this GEM object.
258 * Note: Both the table's contents, and the sg_table itself must be freed by
260 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
262 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
264 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
265 struct drm_device *drm = obj->dev;
266 struct sg_table *sgt;
269 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
271 return ERR_PTR(-ENOMEM);
273 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
274 rk_obj->dma_addr, obj->size,
277 DRM_ERROR("failed to allocate sgt, %d\n", ret);
285 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
287 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
289 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
292 return rk_obj->kvaddr;
295 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)