2 * Copyright (c) 2015 MediaTek Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
15 #include <drm/drm_gem.h>
16 #include <linux/dma-buf.h>
18 #include "mtk_drm_drv.h"
19 #include "mtk_drm_gem.h"
21 static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
24 struct mtk_drm_gem_obj *mtk_gem_obj;
27 size = round_up(size, PAGE_SIZE);
29 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
31 return ERR_PTR(-ENOMEM);
33 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
35 DRM_ERROR("failed to initialize gem object\n");
43 struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
44 size_t size, bool alloc_kmap)
46 struct mtk_drm_private *priv = dev->dev_private;
47 struct mtk_drm_gem_obj *mtk_gem;
48 struct drm_gem_object *obj;
51 mtk_gem = mtk_drm_gem_init(dev, size);
53 return ERR_CAST(mtk_gem);
57 init_dma_attrs(&mtk_gem->dma_attrs);
58 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &mtk_gem->dma_attrs);
61 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &mtk_gem->dma_attrs);
63 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
64 &mtk_gem->dma_addr, GFP_KERNEL,
66 if (!mtk_gem->cookie) {
67 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
73 mtk_gem->kvaddr = mtk_gem->cookie;
75 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
76 mtk_gem->cookie, &mtk_gem->dma_addr,
82 drm_gem_object_release(obj);
87 void mtk_drm_gem_free_object(struct drm_gem_object *obj)
89 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
90 struct mtk_drm_private *priv = obj->dev->dev_private;
93 drm_prime_gem_destroy(obj, mtk_gem->sg);
95 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
96 mtk_gem->dma_addr, &mtk_gem->dma_attrs);
98 /* release file pointer to gem object. */
99 drm_gem_object_release(obj);
104 int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
105 struct drm_mode_create_dumb *args)
107 struct mtk_drm_gem_obj *mtk_gem;
110 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
111 args->size = args->pitch * args->height;
113 mtk_gem = mtk_drm_gem_create(dev, args->size, false);
115 return PTR_ERR(mtk_gem);
118 * allocate a id of idr table where the obj is registered
119 * and handle has the id what user can see.
121 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
123 goto err_handle_create;
125 /* drop reference from allocate - handle holds it now. */
126 drm_gem_object_unreference_unlocked(&mtk_gem->base);
131 mtk_drm_gem_free_object(&mtk_gem->base);
135 int mtk_drm_gem_dumb_map_offset(struct drm_file *file_priv,
136 struct drm_device *dev, uint32_t handle,
139 struct drm_gem_object *obj;
142 obj = drm_gem_object_lookup(file_priv, handle);
144 DRM_ERROR("failed to lookup gem object.\n");
148 ret = drm_gem_create_mmap_offset(obj);
152 *offset = drm_vma_node_offset_addr(&obj->vma_node);
153 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
156 drm_gem_object_unreference_unlocked(obj);
160 static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
161 struct vm_area_struct *vma)
165 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
166 struct mtk_drm_private *priv = obj->dev->dev_private;
169 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
170 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
172 vma->vm_flags &= ~VM_PFNMAP;
175 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
176 mtk_gem->dma_addr, obj->size, &mtk_gem->dma_attrs);
178 drm_gem_vm_close(vma);
183 int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
187 ret = drm_gem_mmap_obj(obj, obj->size, vma);
191 return mtk_drm_gem_object_mmap(obj, vma);
194 int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
196 struct drm_gem_object *obj;
199 ret = drm_gem_mmap(filp, vma);
203 obj = vma->vm_private_data;
205 return mtk_drm_gem_object_mmap(obj, vma);
209 * Allocate a sg_table for this GEM object.
210 * Note: Both the table's contents, and the sg_table itself must be freed by
212 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
214 struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
216 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
217 struct mtk_drm_private *priv = obj->dev->dev_private;
218 struct sg_table *sgt;
221 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
223 return ERR_PTR(-ENOMEM);
225 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
226 mtk_gem->dma_addr, obj->size,
227 &mtk_gem->dma_attrs);
229 DRM_ERROR("failed to allocate sgt, %d\n", ret);
237 struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
238 struct dma_buf_attachment *attach, struct sg_table *sg)
240 struct mtk_drm_gem_obj *mtk_gem;
242 struct scatterlist *s;
246 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
249 return ERR_PTR(PTR_ERR(mtk_gem));
251 expected = sg_dma_address(sg->sgl);
252 for_each_sg(sg->sgl, s, sg->nents, i) {
253 if (sg_dma_address(s) != expected) {
254 DRM_ERROR("sg_table is not contiguous");
258 expected = sg_dma_address(s) + sg_dma_len(s);
261 mtk_gem->dma_addr = sg_dma_address(sg->sgl);
264 return &mtk_gem->base;