11802d0beSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2119f5173SCK Hu /*
3119f5173SCK Hu * Copyright (c) 2015 MediaTek Inc.
4119f5173SCK Hu */
5119f5173SCK Hu
6119f5173SCK Hu #include <linux/dma-buf.h>
7119f5173SCK Hu
81eef08cbSSam Ravnborg #include <drm/drm.h>
99aef5867SSam Ravnborg #include <drm/drm_device.h>
109aef5867SSam Ravnborg #include <drm/drm_gem.h>
114a83c26aSDanilo Krummrich #include <drm/drm_gem_dma_helper.h>
129aef5867SSam Ravnborg #include <drm/drm_prime.h>
139aef5867SSam Ravnborg
14119f5173SCK Hu #include "mtk_drm_drv.h"
15119f5173SCK Hu #include "mtk_drm_gem.h"
16119f5173SCK Hu
17500007ebSThomas Zimmermann static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
18500007ebSThomas Zimmermann
192ea8aec5SRob Clark static const struct vm_operations_struct vm_ops = {
202ea8aec5SRob Clark .open = drm_gem_vm_open,
212ea8aec5SRob Clark .close = drm_gem_vm_close,
222ea8aec5SRob Clark };
232ea8aec5SRob Clark
2484274de6SThomas Zimmermann static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
2584274de6SThomas Zimmermann .free = mtk_drm_gem_free_object,
2684274de6SThomas Zimmermann .get_sg_table = mtk_gem_prime_get_sg_table,
2784274de6SThomas Zimmermann .vmap = mtk_drm_gem_prime_vmap,
2884274de6SThomas Zimmermann .vunmap = mtk_drm_gem_prime_vunmap,
29500007ebSThomas Zimmermann .mmap = mtk_drm_gem_object_mmap,
302ea8aec5SRob Clark .vm_ops = &vm_ops,
3184274de6SThomas Zimmermann };
3284274de6SThomas Zimmermann
mtk_drm_gem_init(struct drm_device * dev,unsigned long size)33119f5173SCK Hu static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
34119f5173SCK Hu unsigned long size)
35119f5173SCK Hu {
36119f5173SCK Hu struct mtk_drm_gem_obj *mtk_gem_obj;
37119f5173SCK Hu int ret;
38119f5173SCK Hu
39119f5173SCK Hu size = round_up(size, PAGE_SIZE);
40119f5173SCK Hu
41af26ea99SJustin Green if (size == 0)
42af26ea99SJustin Green return ERR_PTR(-EINVAL);
43af26ea99SJustin Green
44119f5173SCK Hu mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
45119f5173SCK Hu if (!mtk_gem_obj)
46119f5173SCK Hu return ERR_PTR(-ENOMEM);
47119f5173SCK Hu
4884274de6SThomas Zimmermann mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;
4984274de6SThomas Zimmermann
50119f5173SCK Hu ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
51119f5173SCK Hu if (ret < 0) {
52119f5173SCK Hu DRM_ERROR("failed to initialize gem object\n");
53119f5173SCK Hu kfree(mtk_gem_obj);
54119f5173SCK Hu return ERR_PTR(ret);
55119f5173SCK Hu }
56119f5173SCK Hu
57119f5173SCK Hu return mtk_gem_obj;
58119f5173SCK Hu }
59119f5173SCK Hu
mtk_drm_gem_create(struct drm_device * dev,size_t size,bool alloc_kmap)60119f5173SCK Hu struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
61119f5173SCK Hu size_t size, bool alloc_kmap)
62119f5173SCK Hu {
63119f5173SCK Hu struct mtk_drm_private *priv = dev->dev_private;
64119f5173SCK Hu struct mtk_drm_gem_obj *mtk_gem;
65119f5173SCK Hu struct drm_gem_object *obj;
66119f5173SCK Hu int ret;
67119f5173SCK Hu
68119f5173SCK Hu mtk_gem = mtk_drm_gem_init(dev, size);
69119f5173SCK Hu if (IS_ERR(mtk_gem))
70119f5173SCK Hu return ERR_CAST(mtk_gem);
71119f5173SCK Hu
72119f5173SCK Hu obj = &mtk_gem->base;
73119f5173SCK Hu
7400085f1eSKrzysztof Kozlowski mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
75119f5173SCK Hu
76119f5173SCK Hu if (!alloc_kmap)
7700085f1eSKrzysztof Kozlowski mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
78119f5173SCK Hu
79119f5173SCK Hu mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
80119f5173SCK Hu &mtk_gem->dma_addr, GFP_KERNEL,
8100085f1eSKrzysztof Kozlowski mtk_gem->dma_attrs);
82119f5173SCK Hu if (!mtk_gem->cookie) {
83119f5173SCK Hu DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
84119f5173SCK Hu ret = -ENOMEM;
85119f5173SCK Hu goto err_gem_free;
86119f5173SCK Hu }
87119f5173SCK Hu
88119f5173SCK Hu if (alloc_kmap)
89119f5173SCK Hu mtk_gem->kvaddr = mtk_gem->cookie;
90119f5173SCK Hu
91119f5173SCK Hu DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
92119f5173SCK Hu mtk_gem->cookie, &mtk_gem->dma_addr,
93119f5173SCK Hu size);
94119f5173SCK Hu
95119f5173SCK Hu return mtk_gem;
96119f5173SCK Hu
97119f5173SCK Hu err_gem_free:
98119f5173SCK Hu drm_gem_object_release(obj);
99119f5173SCK Hu kfree(mtk_gem);
100119f5173SCK Hu return ERR_PTR(ret);
101119f5173SCK Hu }
102119f5173SCK Hu
mtk_drm_gem_free_object(struct drm_gem_object * obj)103119f5173SCK Hu void mtk_drm_gem_free_object(struct drm_gem_object *obj)
104119f5173SCK Hu {
105119f5173SCK Hu struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
106119f5173SCK Hu struct mtk_drm_private *priv = obj->dev->dev_private;
107119f5173SCK Hu
108119f5173SCK Hu if (mtk_gem->sg)
109119f5173SCK Hu drm_prime_gem_destroy(obj, mtk_gem->sg);
110119f5173SCK Hu else
111119f5173SCK Hu dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
11200085f1eSKrzysztof Kozlowski mtk_gem->dma_addr, mtk_gem->dma_attrs);
113119f5173SCK Hu
114119f5173SCK Hu /* release file pointer to gem object. */
115119f5173SCK Hu drm_gem_object_release(obj);
116119f5173SCK Hu
117119f5173SCK Hu kfree(mtk_gem);
118119f5173SCK Hu }
119119f5173SCK Hu
mtk_drm_gem_dumb_create(struct drm_file * file_priv,struct drm_device * dev,struct drm_mode_create_dumb * args)120119f5173SCK Hu int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
121119f5173SCK Hu struct drm_mode_create_dumb *args)
122119f5173SCK Hu {
123119f5173SCK Hu struct mtk_drm_gem_obj *mtk_gem;
124119f5173SCK Hu int ret;
125119f5173SCK Hu
126119f5173SCK Hu args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
12796312a25SJason-JH.Lin
12896312a25SJason-JH.Lin /*
12996312a25SJason-JH.Lin * Multiply 2 variables of different types,
13096312a25SJason-JH.Lin * for example: args->size = args->spacing * args->height;
13196312a25SJason-JH.Lin * may cause coverity issue with unintentional overflow.
13296312a25SJason-JH.Lin */
13396312a25SJason-JH.Lin args->size = args->pitch;
13496312a25SJason-JH.Lin args->size *= args->height;
135119f5173SCK Hu
136119f5173SCK Hu mtk_gem = mtk_drm_gem_create(dev, args->size, false);
137119f5173SCK Hu if (IS_ERR(mtk_gem))
138119f5173SCK Hu return PTR_ERR(mtk_gem);
139119f5173SCK Hu
140119f5173SCK Hu /*
141119f5173SCK Hu * allocate a id of idr table where the obj is registered
142119f5173SCK Hu * and handle has the id what user can see.
143119f5173SCK Hu */
144119f5173SCK Hu ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
145119f5173SCK Hu if (ret)
146119f5173SCK Hu goto err_handle_create;
147119f5173SCK Hu
148119f5173SCK Hu /* drop reference from allocate - handle holds it now. */
149556372dfSEmil Velikov drm_gem_object_put(&mtk_gem->base);
150119f5173SCK Hu
151119f5173SCK Hu return 0;
152119f5173SCK Hu
153119f5173SCK Hu err_handle_create:
154119f5173SCK Hu mtk_drm_gem_free_object(&mtk_gem->base);
155119f5173SCK Hu return ret;
156119f5173SCK Hu }
157119f5173SCK Hu
mtk_drm_gem_object_mmap(struct drm_gem_object * obj,struct vm_area_struct * vma)158119f5173SCK Hu static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
159119f5173SCK Hu struct vm_area_struct *vma)
160119f5173SCK Hu
161119f5173SCK Hu {
162119f5173SCK Hu int ret;
163119f5173SCK Hu struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
164119f5173SCK Hu struct mtk_drm_private *priv = obj->dev->dev_private;
165119f5173SCK Hu
166119f5173SCK Hu /*
167500007ebSThomas Zimmermann * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
168500007ebSThomas Zimmermann * whole buffer from the start.
169500007ebSThomas Zimmermann */
170500007ebSThomas Zimmermann vma->vm_pgoff = 0;
171500007ebSThomas Zimmermann
172500007ebSThomas Zimmermann /*
173119f5173SCK Hu * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
174119f5173SCK Hu * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
175119f5173SCK Hu */
1761c71222eSSuren Baghdasaryan vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
177500007ebSThomas Zimmermann vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
178500007ebSThomas Zimmermann vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
179119f5173SCK Hu
180119f5173SCK Hu ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
18100085f1eSKrzysztof Kozlowski mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
182119f5173SCK Hu
183119f5173SCK Hu return ret;
184119f5173SCK Hu }
185119f5173SCK Hu
186119f5173SCK Hu /*
187119f5173SCK Hu * Allocate a sg_table for this GEM object.
188119f5173SCK Hu * Note: Both the table's contents, and the sg_table itself must be freed by
189119f5173SCK Hu * the caller.
190119f5173SCK Hu * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
191119f5173SCK Hu */
mtk_gem_prime_get_sg_table(struct drm_gem_object * obj)192119f5173SCK Hu struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
193119f5173SCK Hu {
194119f5173SCK Hu struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
195119f5173SCK Hu struct mtk_drm_private *priv = obj->dev->dev_private;
196119f5173SCK Hu struct sg_table *sgt;
197119f5173SCK Hu int ret;
198119f5173SCK Hu
199119f5173SCK Hu sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
200119f5173SCK Hu if (!sgt)
201119f5173SCK Hu return ERR_PTR(-ENOMEM);
202119f5173SCK Hu
203119f5173SCK Hu ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
204119f5173SCK Hu mtk_gem->dma_addr, obj->size,
20500085f1eSKrzysztof Kozlowski mtk_gem->dma_attrs);
206119f5173SCK Hu if (ret) {
207119f5173SCK Hu DRM_ERROR("failed to allocate sgt, %d\n", ret);
208119f5173SCK Hu kfree(sgt);
209119f5173SCK Hu return ERR_PTR(ret);
210119f5173SCK Hu }
211119f5173SCK Hu
212119f5173SCK Hu return sgt;
213119f5173SCK Hu }
214119f5173SCK Hu
mtk_gem_prime_import_sg_table(struct drm_device * dev,struct dma_buf_attachment * attach,struct sg_table * sg)215119f5173SCK Hu struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
216119f5173SCK Hu struct dma_buf_attachment *attach, struct sg_table *sg)
217119f5173SCK Hu {
218119f5173SCK Hu struct mtk_drm_gem_obj *mtk_gem;
219960db7fcSMarek Szyprowski
220960db7fcSMarek Szyprowski /* check if the entries in the sg_table are contiguous */
221960db7fcSMarek Szyprowski if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
222960db7fcSMarek Szyprowski DRM_ERROR("sg_table is not contiguous");
223960db7fcSMarek Szyprowski return ERR_PTR(-EINVAL);
224960db7fcSMarek Szyprowski }
225119f5173SCK Hu
226119f5173SCK Hu mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
227119f5173SCK Hu if (IS_ERR(mtk_gem))
2281e109115SGomonovych, Vasyl return ERR_CAST(mtk_gem);
229119f5173SCK Hu
230119f5173SCK Hu mtk_gem->dma_addr = sg_dma_address(sg->sgl);
231119f5173SCK Hu mtk_gem->sg = sg;
232119f5173SCK Hu
233119f5173SCK Hu return &mtk_gem->base;
234119f5173SCK Hu }
2353df64d7bSCK Hu
mtk_drm_gem_prime_vmap(struct drm_gem_object * obj,struct iosys_map * map)2367938f421SLucas De Marchi int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
2373df64d7bSCK Hu {
2383df64d7bSCK Hu struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
2397e542ff8SThomas Zimmermann struct sg_table *sgt = NULL;
2403df64d7bSCK Hu unsigned int npages;
2413df64d7bSCK Hu
2423df64d7bSCK Hu if (mtk_gem->kvaddr)
2437e542ff8SThomas Zimmermann goto out;
2443df64d7bSCK Hu
2453df64d7bSCK Hu sgt = mtk_gem_prime_get_sg_table(obj);
2463df64d7bSCK Hu if (IS_ERR(sgt))
2477e542ff8SThomas Zimmermann return PTR_ERR(sgt);
2483df64d7bSCK Hu
2493df64d7bSCK Hu npages = obj->size >> PAGE_SHIFT;
2503df64d7bSCK Hu mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
2517e542ff8SThomas Zimmermann if (!mtk_gem->pages) {
252dcc583c2SChen-Yu Tsai sg_free_table(sgt);
2537e542ff8SThomas Zimmermann kfree(sgt);
2547e542ff8SThomas Zimmermann return -ENOMEM;
2557e542ff8SThomas Zimmermann }
2563df64d7bSCK Hu
257c67e6279SChristian König drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
25890dcf444SMarek Szyprowski
2593df64d7bSCK Hu mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
2603df64d7bSCK Hu pgprot_writecombine(PAGE_KERNEL));
261379091e0SSui Jingfeng if (!mtk_gem->kvaddr) {
262dcc583c2SChen-Yu Tsai sg_free_table(sgt);
263379091e0SSui Jingfeng kfree(sgt);
264379091e0SSui Jingfeng kfree(mtk_gem->pages);
265379091e0SSui Jingfeng return -ENOMEM;
266379091e0SSui Jingfeng }
267dcc583c2SChen-Yu Tsai sg_free_table(sgt);
2682ec35bd2SWambui Karuga kfree(sgt);
269dcc583c2SChen-Yu Tsai
270dcc583c2SChen-Yu Tsai out:
2717938f421SLucas De Marchi iosys_map_set_vaddr(map, mtk_gem->kvaddr);
2723df64d7bSCK Hu
2737e542ff8SThomas Zimmermann return 0;
2743df64d7bSCK Hu }
2753df64d7bSCK Hu
mtk_drm_gem_prime_vunmap(struct drm_gem_object * obj,struct iosys_map * map)2767938f421SLucas De Marchi void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
2777938f421SLucas De Marchi struct iosys_map *map)
2783df64d7bSCK Hu {
2793df64d7bSCK Hu struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
2807e542ff8SThomas Zimmermann void *vaddr = map->vaddr;
2813df64d7bSCK Hu
2823df64d7bSCK Hu if (!mtk_gem->pages)
2833df64d7bSCK Hu return;
2843df64d7bSCK Hu
2853df64d7bSCK Hu vunmap(vaddr);
2864744cde0SMiles Chen mtk_gem->kvaddr = NULL;
2872ec35bd2SWambui Karuga kfree(mtk_gem->pages);
2883df64d7bSCK Hu }
289