1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015 MediaTek Inc.
6 #include <linux/dma-buf.h>
8 #include <drm/drm_device.h>
9 #include <drm/drm_gem.h>
10 #include <drm/drm_prime.h>
12 #include "mtk_drm_drv.h"
13 #include "mtk_drm_gem.h"
15 static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
18 struct mtk_drm_gem_obj *mtk_gem_obj;
21 size = round_up(size, PAGE_SIZE);
23 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
25 return ERR_PTR(-ENOMEM);
27 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
29 DRM_ERROR("failed to initialize gem object\n");
37 struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
38 size_t size, bool alloc_kmap)
40 struct mtk_drm_private *priv = dev->dev_private;
41 struct mtk_drm_gem_obj *mtk_gem;
42 struct drm_gem_object *obj;
45 mtk_gem = mtk_drm_gem_init(dev, size);
47 return ERR_CAST(mtk_gem);
51 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
54 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
56 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
57 &mtk_gem->dma_addr, GFP_KERNEL,
59 if (!mtk_gem->cookie) {
60 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
66 mtk_gem->kvaddr = mtk_gem->cookie;
68 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
69 mtk_gem->cookie, &mtk_gem->dma_addr,
75 drm_gem_object_release(obj);
80 void mtk_drm_gem_free_object(struct drm_gem_object *obj)
82 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
83 struct mtk_drm_private *priv = obj->dev->dev_private;
86 drm_prime_gem_destroy(obj, mtk_gem->sg);
88 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
89 mtk_gem->dma_addr, mtk_gem->dma_attrs);
91 /* release file pointer to gem object. */
92 drm_gem_object_release(obj);
97 int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
98 struct drm_mode_create_dumb *args)
100 struct mtk_drm_gem_obj *mtk_gem;
103 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
104 args->size = args->pitch * args->height;
106 mtk_gem = mtk_drm_gem_create(dev, args->size, false);
108 return PTR_ERR(mtk_gem);
111 * allocate a id of idr table where the obj is registered
112 * and handle has the id what user can see.
114 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
116 goto err_handle_create;
118 /* drop reference from allocate - handle holds it now. */
119 drm_gem_object_put_unlocked(&mtk_gem->base);
124 mtk_drm_gem_free_object(&mtk_gem->base);
128 static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
129 struct vm_area_struct *vma)
133 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
134 struct mtk_drm_private *priv = obj->dev->dev_private;
137 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
138 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
140 vma->vm_flags &= ~VM_PFNMAP;
142 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
143 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
145 drm_gem_vm_close(vma);
150 int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
154 ret = drm_gem_mmap_obj(obj, obj->size, vma);
158 return mtk_drm_gem_object_mmap(obj, vma);
161 int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
163 struct drm_gem_object *obj;
166 ret = drm_gem_mmap(filp, vma);
170 obj = vma->vm_private_data;
173 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
174 * whole buffer from the start.
178 return mtk_drm_gem_object_mmap(obj, vma);
182 * Allocate a sg_table for this GEM object.
183 * Note: Both the table's contents, and the sg_table itself must be freed by
185 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
187 struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
189 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
190 struct mtk_drm_private *priv = obj->dev->dev_private;
191 struct sg_table *sgt;
194 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
196 return ERR_PTR(-ENOMEM);
198 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
199 mtk_gem->dma_addr, obj->size,
202 DRM_ERROR("failed to allocate sgt, %d\n", ret);
210 struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
211 struct dma_buf_attachment *attach, struct sg_table *sg)
213 struct mtk_drm_gem_obj *mtk_gem;
215 struct scatterlist *s;
219 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
222 return ERR_CAST(mtk_gem);
224 expected = sg_dma_address(sg->sgl);
225 for_each_sg(sg->sgl, s, sg->nents, i) {
226 if (sg_dma_address(s) != expected) {
227 DRM_ERROR("sg_table is not contiguous");
231 expected = sg_dma_address(s) + sg_dma_len(s);
234 mtk_gem->dma_addr = sg_dma_address(sg->sgl);
237 return &mtk_gem->base;
244 void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)
246 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
247 struct sg_table *sgt;
248 struct sg_page_iter iter;
253 return mtk_gem->kvaddr;
255 sgt = mtk_gem_prime_get_sg_table(obj);
259 npages = obj->size >> PAGE_SHIFT;
260 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
264 for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
265 mtk_gem->pages[i++] = sg_page_iter_page(&iter);
269 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
270 pgprot_writecombine(PAGE_KERNEL));
275 return mtk_gem->kvaddr;
278 void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
280 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
287 kfree((void *)mtk_gem->pages);