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>
19 #include <drm/rockchip_drm.h>
21 #include <linux/dma-attrs.h>
23 #include "rockchip_drm_drv.h"
24 #include "rockchip_drm_gem.h"
26 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
29 struct drm_gem_object *obj = &rk_obj->base;
30 struct drm_device *drm = obj->dev;
32 init_dma_attrs(&rk_obj->dma_attrs);
33 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
36 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
38 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
39 &rk_obj->dma_addr, GFP_KERNEL,
41 if (!rk_obj->kvaddr) {
42 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
49 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
51 struct drm_gem_object *obj = &rk_obj->base;
52 struct drm_device *drm = obj->dev;
54 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
58 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
59 struct vm_area_struct *vma)
63 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
64 struct drm_device *drm = obj->dev;
67 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
68 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
70 vma->vm_flags &= ~VM_PFNMAP;
73 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
74 obj->size, &rk_obj->dma_attrs);
76 drm_gem_vm_close(vma);
81 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
82 struct vm_area_struct *vma)
86 ret = drm_gem_mmap_obj(obj, obj->size, vma);
90 return rockchip_drm_gem_object_mmap(obj, vma);
93 /* drm driver mmap file operations */
94 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
96 struct drm_gem_object *obj;
99 ret = drm_gem_mmap(filp, vma);
103 obj = vma->vm_private_data;
105 return rockchip_drm_gem_object_mmap(obj, vma);
108 struct rockchip_gem_object *
109 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
112 struct rockchip_gem_object *rk_obj;
113 struct drm_gem_object *obj;
116 size = round_up(size, PAGE_SIZE);
118 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
120 return ERR_PTR(-ENOMEM);
124 drm_gem_private_object_init(drm, obj, size);
126 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
128 goto err_free_rk_obj;
138 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
141 void rockchip_gem_free_object(struct drm_gem_object *obj)
143 struct rockchip_gem_object *rk_obj;
145 drm_gem_free_mmap_offset(obj);
147 rk_obj = to_rockchip_obj(obj);
149 rockchip_gem_free_buf(rk_obj);
155 * rockchip_gem_create_with_handle - allocate an object with the given
156 * size and create a gem handle on it
158 * returns a struct rockchip_gem_object* on success or ERR_PTR values
161 static struct rockchip_gem_object *
162 rockchip_gem_create_with_handle(struct drm_file *file_priv,
163 struct drm_device *drm, unsigned int size,
164 unsigned int *handle)
166 struct rockchip_gem_object *rk_obj;
167 struct drm_gem_object *obj;
170 rk_obj = rockchip_gem_create_object(drm, size, false);
172 return ERR_CAST(rk_obj);
177 * allocate a id of idr table where the obj is registered
178 * and handle has the id what user can see.
180 ret = drm_gem_handle_create(file_priv, obj, handle);
182 goto err_handle_create;
184 /* drop reference from allocate - handle holds it now. */
185 drm_gem_object_unreference_unlocked(obj);
190 rockchip_gem_free_object(obj);
195 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
196 struct drm_device *dev, uint32_t handle,
199 struct drm_gem_object *obj;
202 obj = drm_gem_object_lookup(dev, file_priv, handle);
204 DRM_ERROR("failed to lookup gem object.\n");
208 ret = drm_gem_create_mmap_offset(obj);
212 *offset = drm_vma_node_offset_addr(&obj->vma_node);
213 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
216 drm_gem_object_unreference_unlocked(obj);
222 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
225 * This aligns the pitch and size arguments to the minimum required. wrap
226 * this into your own function if you need bigger alignment.
228 int rockchip_gem_dumb_create(struct drm_file *file_priv,
229 struct drm_device *dev,
230 struct drm_mode_create_dumb *args)
232 struct rockchip_gem_object *rk_obj;
233 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
236 * align to 64 bytes since Mali requires it.
238 args->pitch = ALIGN(min_pitch, 64);
239 args->size = args->pitch * args->height;
241 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
244 return PTR_ERR_OR_ZERO(rk_obj);
247 int rockchip_gem_map_offset_ioctl(struct drm_device *drm, void *data,
248 struct drm_file *file_priv)
250 struct drm_rockchip_gem_map_off *args = data;
252 return rockchip_gem_dumb_map_offset(file_priv, drm, args->handle,
256 int rockchip_gem_create_ioctl(struct drm_device *dev, void *data,
257 struct drm_file *file_priv)
259 struct drm_rockchip_gem_create *args = data;
260 struct rockchip_gem_object *rk_obj;
262 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
264 return PTR_ERR_OR_ZERO(rk_obj);
268 * Allocate a sg_table for this GEM object.
269 * Note: Both the table's contents, and the sg_table itself must be freed by
271 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
273 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
275 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
276 struct drm_device *drm = obj->dev;
277 struct sg_table *sgt;
280 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
282 return ERR_PTR(-ENOMEM);
284 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
285 rk_obj->dma_addr, obj->size,
288 DRM_ERROR("failed to allocate sgt, %d\n", ret);
296 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
298 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
300 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
303 return rk_obj->kvaddr;
306 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)