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  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2015 MediaTek Inc.
  4 */
  5
  6#include <linux/dma-buf.h>
  7
  8#include <drm/drm.h>
  9#include <drm/drm_device.h>
 10#include <drm/drm_gem.h>
 11#include <drm/drm_prime.h>
 12
 13#include "mtk_drm_drv.h"
 14#include "mtk_drm_gem.h"
 15
 16static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
 17						unsigned long size)
 18{
 19	struct mtk_drm_gem_obj *mtk_gem_obj;
 20	int ret;
 21
 22	size = round_up(size, PAGE_SIZE);
 23
 24	mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
 25	if (!mtk_gem_obj)
 26		return ERR_PTR(-ENOMEM);
 27
 28	ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
 29	if (ret < 0) {
 30		DRM_ERROR("failed to initialize gem object\n");
 31		kfree(mtk_gem_obj);
 32		return ERR_PTR(ret);
 33	}
 34
 35	return mtk_gem_obj;
 36}
 37
 38struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
 39					   size_t size, bool alloc_kmap)
 40{
 41	struct mtk_drm_private *priv = dev->dev_private;
 42	struct mtk_drm_gem_obj *mtk_gem;
 43	struct drm_gem_object *obj;
 44	int ret;
 45
 46	mtk_gem = mtk_drm_gem_init(dev, size);
 47	if (IS_ERR(mtk_gem))
 48		return ERR_CAST(mtk_gem);
 49
 50	obj = &mtk_gem->base;
 51
 52	mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
 53
 54	if (!alloc_kmap)
 55		mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
 56
 57	mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
 58					  &mtk_gem->dma_addr, GFP_KERNEL,
 59					  mtk_gem->dma_attrs);
 60	if (!mtk_gem->cookie) {
 61		DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
 62		ret = -ENOMEM;
 63		goto err_gem_free;
 64	}
 65
 66	if (alloc_kmap)
 67		mtk_gem->kvaddr = mtk_gem->cookie;
 68
 69	DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
 70			 mtk_gem->cookie, &mtk_gem->dma_addr,
 71			 size);
 72
 73	return mtk_gem;
 74
 75err_gem_free:
 76	drm_gem_object_release(obj);
 77	kfree(mtk_gem);
 78	return ERR_PTR(ret);
 79}
 80
 81void mtk_drm_gem_free_object(struct drm_gem_object *obj)
 82{
 83	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
 84	struct mtk_drm_private *priv = obj->dev->dev_private;
 85
 86	if (mtk_gem->sg)
 87		drm_prime_gem_destroy(obj, mtk_gem->sg);
 88	else
 89		dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
 90			       mtk_gem->dma_addr, mtk_gem->dma_attrs);
 91
 92	/* release file pointer to gem object. */
 93	drm_gem_object_release(obj);
 94
 95	kfree(mtk_gem);
 96}
 97
 98int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
 99			    struct drm_mode_create_dumb *args)
100{
101	struct mtk_drm_gem_obj *mtk_gem;
102	int ret;
103
104	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
105	args->size = args->pitch * args->height;
106
107	mtk_gem = mtk_drm_gem_create(dev, args->size, false);
108	if (IS_ERR(mtk_gem))
109		return PTR_ERR(mtk_gem);
110
111	/*
112	 * allocate a id of idr table where the obj is registered
113	 * and handle has the id what user can see.
114	 */
115	ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
116	if (ret)
117		goto err_handle_create;
118
119	/* drop reference from allocate - handle holds it now. */
120	drm_gem_object_put_unlocked(&mtk_gem->base);
121
122	return 0;
123
124err_handle_create:
125	mtk_drm_gem_free_object(&mtk_gem->base);
126	return ret;
127}
128
129static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
130				   struct vm_area_struct *vma)
131
132{
133	int ret;
134	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
135	struct mtk_drm_private *priv = obj->dev->dev_private;
136
137	/*
138	 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
139	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
140	 */
141	vma->vm_flags &= ~VM_PFNMAP;
142
143	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
144			     mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
145	if (ret)
146		drm_gem_vm_close(vma);
147
148	return ret;
149}
150
151int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
152{
153	int ret;
154
155	ret = drm_gem_mmap_obj(obj, obj->size, vma);
156	if (ret)
157		return ret;
158
159	return mtk_drm_gem_object_mmap(obj, vma);
160}
161
162int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
163{
164	struct drm_gem_object *obj;
165	int ret;
166
167	ret = drm_gem_mmap(filp, vma);
168	if (ret)
169		return ret;
170
171	obj = vma->vm_private_data;
172
173	/*
174	 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
175	 * whole buffer from the start.
176	 */
177	vma->vm_pgoff = 0;
178
179	return mtk_drm_gem_object_mmap(obj, vma);
180}
181
182/*
183 * Allocate a sg_table for this GEM object.
184 * Note: Both the table's contents, and the sg_table itself must be freed by
185 *       the caller.
186 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
187 */
188struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
189{
190	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
191	struct mtk_drm_private *priv = obj->dev->dev_private;
192	struct sg_table *sgt;
193	int ret;
194
195	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
196	if (!sgt)
197		return ERR_PTR(-ENOMEM);
198
199	ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
200				    mtk_gem->dma_addr, obj->size,
201				    mtk_gem->dma_attrs);
202	if (ret) {
203		DRM_ERROR("failed to allocate sgt, %d\n", ret);
204		kfree(sgt);
205		return ERR_PTR(ret);
206	}
207
208	return sgt;
209}
210
211struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
212			struct dma_buf_attachment *attach, struct sg_table *sg)
213{
214	struct mtk_drm_gem_obj *mtk_gem;
215	int ret;
216	struct scatterlist *s;
217	unsigned int i;
218	dma_addr_t expected;
219
220	mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
221
222	if (IS_ERR(mtk_gem))
223		return ERR_CAST(mtk_gem);
224
225	expected = sg_dma_address(sg->sgl);
226	for_each_sg(sg->sgl, s, sg->nents, i) {
227		if (sg_dma_address(s) != expected) {
228			DRM_ERROR("sg_table is not contiguous");
229			ret = -EINVAL;
230			goto err_gem_free;
231		}
232		expected = sg_dma_address(s) + sg_dma_len(s);
233	}
234
235	mtk_gem->dma_addr = sg_dma_address(sg->sgl);
236	mtk_gem->sg = sg;
237
238	return &mtk_gem->base;
239
240err_gem_free:
241	kfree(mtk_gem);
242	return ERR_PTR(ret);
243}
244
245void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)
246{
247	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
248	struct sg_table *sgt;
249	struct sg_page_iter iter;
250	unsigned int npages;
251	unsigned int i = 0;
252
253	if (mtk_gem->kvaddr)
254		return mtk_gem->kvaddr;
255
256	sgt = mtk_gem_prime_get_sg_table(obj);
257	if (IS_ERR(sgt))
258		return NULL;
259
260	npages = obj->size >> PAGE_SHIFT;
261	mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
262	if (!mtk_gem->pages)
263		goto out;
264
265	for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
266		mtk_gem->pages[i++] = sg_page_iter_page(&iter);
267		if (i > npages)
268			break;
269	}
270	mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
271			       pgprot_writecombine(PAGE_KERNEL));
272
273out:
274	kfree((void *)sgt);
275
276	return mtk_gem->kvaddr;
277}
278
279void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
280{
281	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
282
283	if (!mtk_gem->pages)
284		return;
285
286	vunmap(vaddr);
287	mtk_gem->kvaddr = 0;
288	kfree((void *)mtk_gem->pages);
289}