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1/*
2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
4 *
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.
8 *
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.
13 */
14
15#include <drm/drm.h>
16#include <drm/drmP.h>
17#include <drm/drm_gem.h>
18#include <drm/drm_vma_manager.h>
19
20#include <linux/dma-attrs.h>
21
22#include "rockchip_drm_drv.h"
23#include "rockchip_drm_gem.h"
24
25static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
26 bool alloc_kmap)
27{
28 struct drm_gem_object *obj = &rk_obj->base;
29 struct drm_device *drm = obj->dev;
30
31 init_dma_attrs(&rk_obj->dma_attrs);
32 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
33
34 if (!alloc_kmap)
35 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
36
37 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
38 &rk_obj->dma_addr, GFP_KERNEL,
39 &rk_obj->dma_attrs);
40 if (!rk_obj->kvaddr) {
41 DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size);
42 return -ENOMEM;
43 }
44
45 return 0;
46}
47
48static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
49{
50 struct drm_gem_object *obj = &rk_obj->base;
51 struct drm_device *drm = obj->dev;
52
53 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
54 &rk_obj->dma_attrs);
55}
56
57static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
58 struct vm_area_struct *vma)
59
60{
61 int ret;
62 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
63 struct drm_device *drm = obj->dev;
64
65 /*
66 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
67 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
68 */
69 vma->vm_flags &= ~VM_PFNMAP;
70 vma->vm_pgoff = 0;
71
72 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
73 obj->size, &rk_obj->dma_attrs);
74 if (ret)
75 drm_gem_vm_close(vma);
76
77 return ret;
78}
79
80int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
81 struct vm_area_struct *vma)
82{
83 int ret;
84
85 ret = drm_gem_mmap_obj(obj, obj->size, vma);
86 if (ret)
87 return ret;
88
89 return rockchip_drm_gem_object_mmap(obj, vma);
90}
91
92/* drm driver mmap file operations */
93int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
94{
95 struct drm_gem_object *obj;
96 int ret;
97
98 ret = drm_gem_mmap(filp, vma);
99 if (ret)
100 return ret;
101
102 obj = vma->vm_private_data;
103
104 return rockchip_drm_gem_object_mmap(obj, vma);
105}
106
107struct rockchip_gem_object *
108 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
109 bool alloc_kmap)
110{
111 struct rockchip_gem_object *rk_obj;
112 struct drm_gem_object *obj;
113 int ret;
114
115 size = round_up(size, PAGE_SIZE);
116
117 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
118 if (!rk_obj)
119 return ERR_PTR(-ENOMEM);
120
121 obj = &rk_obj->base;
122
123 drm_gem_private_object_init(drm, obj, size);
124
125 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
126 if (ret)
127 goto err_free_rk_obj;
128
129 return rk_obj;
130
131err_free_rk_obj:
132 kfree(rk_obj);
133 return ERR_PTR(ret);
134}
135
136/*
137 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
138 * function
139 */
140void rockchip_gem_free_object(struct drm_gem_object *obj)
141{
142 struct rockchip_gem_object *rk_obj;
143
144 drm_gem_free_mmap_offset(obj);
145
146 rk_obj = to_rockchip_obj(obj);
147
148 rockchip_gem_free_buf(rk_obj);
149
150 kfree(rk_obj);
151}
152
153/*
154 * rockchip_gem_create_with_handle - allocate an object with the given
155 * size and create a gem handle on it
156 *
157 * returns a struct rockchip_gem_object* on success or ERR_PTR values
158 * on failure.
159 */
160static struct rockchip_gem_object *
161rockchip_gem_create_with_handle(struct drm_file *file_priv,
162 struct drm_device *drm, unsigned int size,
163 unsigned int *handle)
164{
165 struct rockchip_gem_object *rk_obj;
166 struct drm_gem_object *obj;
167 int ret;
168
169 rk_obj = rockchip_gem_create_object(drm, size, false);
170 if (IS_ERR(rk_obj))
171 return ERR_CAST(rk_obj);
172
173 obj = &rk_obj->base;
174
175 /*
176 * allocate a id of idr table where the obj is registered
177 * and handle has the id what user can see.
178 */
179 ret = drm_gem_handle_create(file_priv, obj, handle);
180 if (ret)
181 goto err_handle_create;
182
183 /* drop reference from allocate - handle holds it now. */
184 drm_gem_object_unreference_unlocked(obj);
185
186 return rk_obj;
187
188err_handle_create:
189 rockchip_gem_free_object(obj);
190
191 return ERR_PTR(ret);
192}
193
194int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
195 struct drm_device *dev, uint32_t handle,
196 uint64_t *offset)
197{
198 struct drm_gem_object *obj;
199 int ret;
200
201 obj = drm_gem_object_lookup(dev, file_priv, handle);
202 if (!obj) {
203 DRM_ERROR("failed to lookup gem object.\n");
204 return -EINVAL;
205 }
206
207 ret = drm_gem_create_mmap_offset(obj);
208 if (ret)
209 goto out;
210
211 *offset = drm_vma_node_offset_addr(&obj->vma_node);
212 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
213
214out:
215 drm_gem_object_unreference_unlocked(obj);
216
217 return 0;
218}
219
220/*
221 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
222 * function
223 *
224 * This aligns the pitch and size arguments to the minimum required. wrap
225 * this into your own function if you need bigger alignment.
226 */
227int rockchip_gem_dumb_create(struct drm_file *file_priv,
228 struct drm_device *dev,
229 struct drm_mode_create_dumb *args)
230{
231 struct rockchip_gem_object *rk_obj;
232 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
233
234 /*
235 * align to 64 bytes since Mali requires it.
236 */
237 args->pitch = ALIGN(min_pitch, 64);
238 args->size = args->pitch * args->height;
239
240 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
241 &args->handle);
242
243 return PTR_ERR_OR_ZERO(rk_obj);
244}
245
246/*
247 * Allocate a sg_table for this GEM object.
248 * Note: Both the table's contents, and the sg_table itself must be freed by
249 * the caller.
250 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
251 */
252struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
253{
254 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
255 struct drm_device *drm = obj->dev;
256 struct sg_table *sgt;
257 int ret;
258
259 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
260 if (!sgt)
261 return ERR_PTR(-ENOMEM);
262
263 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
264 rk_obj->dma_addr, obj->size,
265 &rk_obj->dma_attrs);
266 if (ret) {
267 DRM_ERROR("failed to allocate sgt, %d\n", ret);
268 kfree(sgt);
269 return ERR_PTR(ret);
270 }
271
272 return sgt;
273}
274
275void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
276{
277 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
278
279 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
280 return NULL;
281
282 return rk_obj->kvaddr;
283}
284
285void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
286{
287 /* Nothing to do */
288}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
4 * Author:Mark Yao <mark.yao@rock-chips.com>
5 */
6
7#include <linux/dma-buf.h>
8#include <linux/iommu.h>
9#include <linux/vmalloc.h>
10
11#include <drm/drm.h>
12#include <drm/drm_fb_helper.h>
13#include <drm/drm_gem.h>
14#include <drm/drm_gem_dma_helper.h>
15#include <drm/drm_prime.h>
16#include <drm/drm_vma_manager.h>
17
18#include "rockchip_drm_drv.h"
19#include "rockchip_drm_gem.h"
20
21static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
22{
23 struct drm_device *drm = rk_obj->base.dev;
24 struct rockchip_drm_private *private = drm->dev_private;
25 int prot = IOMMU_READ | IOMMU_WRITE;
26 ssize_t ret;
27
28 mutex_lock(&private->mm_lock);
29 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
30 rk_obj->base.size, PAGE_SIZE,
31 0, 0);
32 mutex_unlock(&private->mm_lock);
33
34 if (ret < 0) {
35 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
36 return ret;
37 }
38
39 rk_obj->dma_addr = rk_obj->mm.start;
40
41 ret = iommu_map_sgtable(private->domain, rk_obj->dma_addr, rk_obj->sgt,
42 prot);
43 if (ret < (ssize_t)rk_obj->base.size) {
44 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
45 ret, rk_obj->base.size);
46 ret = -ENOMEM;
47 goto err_remove_node;
48 }
49
50 rk_obj->size = ret;
51
52 return 0;
53
54err_remove_node:
55 mutex_lock(&private->mm_lock);
56 drm_mm_remove_node(&rk_obj->mm);
57 mutex_unlock(&private->mm_lock);
58
59 return ret;
60}
61
62static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
63{
64 struct drm_device *drm = rk_obj->base.dev;
65 struct rockchip_drm_private *private = drm->dev_private;
66
67 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
68
69 mutex_lock(&private->mm_lock);
70
71 drm_mm_remove_node(&rk_obj->mm);
72
73 mutex_unlock(&private->mm_lock);
74
75 return 0;
76}
77
78static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
79{
80 struct drm_device *drm = rk_obj->base.dev;
81 int ret, i;
82 struct scatterlist *s;
83
84 rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
85 if (IS_ERR(rk_obj->pages))
86 return PTR_ERR(rk_obj->pages);
87
88 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
89
90 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->base.dev,
91 rk_obj->pages, rk_obj->num_pages);
92 if (IS_ERR(rk_obj->sgt)) {
93 ret = PTR_ERR(rk_obj->sgt);
94 goto err_put_pages;
95 }
96
97 /*
98 * Fake up the SG table so that dma_sync_sg_for_device() can be used
99 * to flush the pages associated with it.
100 *
101 * TODO: Replace this by drm_clflush_sg() once it can be implemented
102 * without relying on symbols that are not exported.
103 */
104 for_each_sgtable_sg(rk_obj->sgt, s, i)
105 sg_dma_address(s) = sg_phys(s);
106
107 dma_sync_sgtable_for_device(drm->dev, rk_obj->sgt, DMA_TO_DEVICE);
108
109 return 0;
110
111err_put_pages:
112 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
113 return ret;
114}
115
116static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
117{
118 sg_free_table(rk_obj->sgt);
119 kfree(rk_obj->sgt);
120 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
121}
122
123static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
124 bool alloc_kmap)
125{
126 int ret;
127
128 ret = rockchip_gem_get_pages(rk_obj);
129 if (ret < 0)
130 return ret;
131
132 ret = rockchip_gem_iommu_map(rk_obj);
133 if (ret < 0)
134 goto err_free;
135
136 if (alloc_kmap) {
137 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
138 pgprot_writecombine(PAGE_KERNEL));
139 if (!rk_obj->kvaddr) {
140 DRM_ERROR("failed to vmap() buffer\n");
141 ret = -ENOMEM;
142 goto err_unmap;
143 }
144 }
145
146 return 0;
147
148err_unmap:
149 rockchip_gem_iommu_unmap(rk_obj);
150err_free:
151 rockchip_gem_put_pages(rk_obj);
152
153 return ret;
154}
155
156static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
157 bool alloc_kmap)
158{
159 struct drm_gem_object *obj = &rk_obj->base;
160 struct drm_device *drm = obj->dev;
161
162 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
163
164 if (!alloc_kmap)
165 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
166
167 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
168 &rk_obj->dma_addr, GFP_KERNEL,
169 rk_obj->dma_attrs);
170 if (!rk_obj->kvaddr) {
171 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
172 return -ENOMEM;
173 }
174
175 return 0;
176}
177
178static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
179 bool alloc_kmap)
180{
181 struct drm_gem_object *obj = &rk_obj->base;
182 struct drm_device *drm = obj->dev;
183 struct rockchip_drm_private *private = drm->dev_private;
184
185 if (private->domain)
186 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
187 else
188 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
189}
190
191static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
192{
193 vunmap(rk_obj->kvaddr);
194 rockchip_gem_iommu_unmap(rk_obj);
195 rockchip_gem_put_pages(rk_obj);
196}
197
198static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
199{
200 struct drm_gem_object *obj = &rk_obj->base;
201 struct drm_device *drm = obj->dev;
202
203 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
204 rk_obj->dma_attrs);
205}
206
207static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
208{
209 if (rk_obj->pages)
210 rockchip_gem_free_iommu(rk_obj);
211 else
212 rockchip_gem_free_dma(rk_obj);
213}
214
215static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
216 struct vm_area_struct *vma)
217{
218 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
219 unsigned int count = obj->size >> PAGE_SHIFT;
220 unsigned long user_count = vma_pages(vma);
221
222 if (user_count == 0)
223 return -ENXIO;
224
225 return vm_map_pages(vma, rk_obj->pages, count);
226}
227
228static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
229 struct vm_area_struct *vma)
230{
231 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
232 struct drm_device *drm = obj->dev;
233
234 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
235 obj->size, rk_obj->dma_attrs);
236}
237
238static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
239 struct vm_area_struct *vma)
240{
241 int ret;
242 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
243
244 /*
245 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
246 * whole buffer from the start.
247 */
248 vma->vm_pgoff = 0;
249
250 /*
251 * We allocated a struct page table for rk_obj, so clear
252 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
253 */
254 vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP);
255
256 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
257 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
258
259 if (rk_obj->pages)
260 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
261 else
262 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
263
264 return ret;
265}
266
267static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
268{
269 drm_gem_object_release(&rk_obj->base);
270 kfree(rk_obj);
271}
272
273static const struct drm_gem_object_funcs rockchip_gem_object_funcs = {
274 .free = rockchip_gem_free_object,
275 .get_sg_table = rockchip_gem_prime_get_sg_table,
276 .vmap = rockchip_gem_prime_vmap,
277 .vunmap = rockchip_gem_prime_vunmap,
278 .mmap = rockchip_drm_gem_object_mmap,
279 .vm_ops = &drm_gem_dma_vm_ops,
280};
281
282static struct rockchip_gem_object *
283 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
284{
285 struct rockchip_gem_object *rk_obj;
286 struct drm_gem_object *obj;
287
288 size = round_up(size, PAGE_SIZE);
289
290 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
291 if (!rk_obj)
292 return ERR_PTR(-ENOMEM);
293
294 obj = &rk_obj->base;
295
296 obj->funcs = &rockchip_gem_object_funcs;
297
298 drm_gem_object_init(drm, obj, size);
299
300 return rk_obj;
301}
302
303struct rockchip_gem_object *
304rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
305 bool alloc_kmap)
306{
307 struct rockchip_gem_object *rk_obj;
308 int ret;
309
310 rk_obj = rockchip_gem_alloc_object(drm, size);
311 if (IS_ERR(rk_obj))
312 return rk_obj;
313
314 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
315 if (ret)
316 goto err_free_rk_obj;
317
318 return rk_obj;
319
320err_free_rk_obj:
321 rockchip_gem_release_object(rk_obj);
322 return ERR_PTR(ret);
323}
324
325/*
326 * rockchip_gem_free_object - (struct drm_gem_object_funcs)->free
327 * callback function
328 */
329void rockchip_gem_free_object(struct drm_gem_object *obj)
330{
331 struct drm_device *drm = obj->dev;
332 struct rockchip_drm_private *private = drm->dev_private;
333 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
334
335 if (obj->import_attach) {
336 if (private->domain) {
337 rockchip_gem_iommu_unmap(rk_obj);
338 } else {
339 dma_unmap_sgtable(drm->dev, rk_obj->sgt,
340 DMA_BIDIRECTIONAL, 0);
341 }
342 drm_prime_gem_destroy(obj, rk_obj->sgt);
343 } else {
344 rockchip_gem_free_buf(rk_obj);
345 }
346
347 rockchip_gem_release_object(rk_obj);
348}
349
350/*
351 * rockchip_gem_create_with_handle - allocate an object with the given
352 * size and create a gem handle on it
353 *
354 * returns a struct rockchip_gem_object* on success or ERR_PTR values
355 * on failure.
356 */
357static struct rockchip_gem_object *
358rockchip_gem_create_with_handle(struct drm_file *file_priv,
359 struct drm_device *drm, unsigned int size,
360 unsigned int *handle)
361{
362 struct rockchip_gem_object *rk_obj;
363 struct drm_gem_object *obj;
364 bool is_framebuffer;
365 int ret;
366
367 is_framebuffer = drm->fb_helper && file_priv == drm->fb_helper->client.file;
368
369 rk_obj = rockchip_gem_create_object(drm, size, is_framebuffer);
370 if (IS_ERR(rk_obj))
371 return ERR_CAST(rk_obj);
372
373 obj = &rk_obj->base;
374
375 /*
376 * allocate a id of idr table where the obj is registered
377 * and handle has the id what user can see.
378 */
379 ret = drm_gem_handle_create(file_priv, obj, handle);
380 if (ret)
381 goto err_handle_create;
382
383 /* drop reference from allocate - handle holds it now. */
384 drm_gem_object_put(obj);
385
386 return rk_obj;
387
388err_handle_create:
389 rockchip_gem_free_object(obj);
390
391 return ERR_PTR(ret);
392}
393
394/*
395 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
396 * function
397 *
398 * This aligns the pitch and size arguments to the minimum required. wrap
399 * this into your own function if you need bigger alignment.
400 */
401int rockchip_gem_dumb_create(struct drm_file *file_priv,
402 struct drm_device *dev,
403 struct drm_mode_create_dumb *args)
404{
405 struct rockchip_gem_object *rk_obj;
406 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
407
408 /*
409 * align to 64 bytes since Mali requires it.
410 */
411 args->pitch = ALIGN(min_pitch, 64);
412 args->size = args->pitch * args->height;
413
414 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
415 &args->handle);
416
417 return PTR_ERR_OR_ZERO(rk_obj);
418}
419
420/*
421 * Allocate a sg_table for this GEM object.
422 * Note: Both the table's contents, and the sg_table itself must be freed by
423 * the caller.
424 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
425 */
426struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
427{
428 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
429 struct drm_device *drm = obj->dev;
430 struct sg_table *sgt;
431 int ret;
432
433 if (rk_obj->pages)
434 return drm_prime_pages_to_sg(obj->dev, rk_obj->pages, rk_obj->num_pages);
435
436 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
437 if (!sgt)
438 return ERR_PTR(-ENOMEM);
439
440 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
441 rk_obj->dma_addr, obj->size,
442 rk_obj->dma_attrs);
443 if (ret) {
444 DRM_ERROR("failed to allocate sgt, %d\n", ret);
445 kfree(sgt);
446 return ERR_PTR(ret);
447 }
448
449 return sgt;
450}
451
452static int
453rockchip_gem_iommu_map_sg(struct drm_device *drm,
454 struct dma_buf_attachment *attach,
455 struct sg_table *sg,
456 struct rockchip_gem_object *rk_obj)
457{
458 rk_obj->sgt = sg;
459 return rockchip_gem_iommu_map(rk_obj);
460}
461
462static int
463rockchip_gem_dma_map_sg(struct drm_device *drm,
464 struct dma_buf_attachment *attach,
465 struct sg_table *sg,
466 struct rockchip_gem_object *rk_obj)
467{
468 int err = dma_map_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);
469 if (err)
470 return err;
471
472 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
473 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
474 dma_unmap_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);
475 return -EINVAL;
476 }
477
478 rk_obj->dma_addr = sg_dma_address(sg->sgl);
479 rk_obj->sgt = sg;
480 return 0;
481}
482
483struct drm_gem_object *
484rockchip_gem_prime_import_sg_table(struct drm_device *drm,
485 struct dma_buf_attachment *attach,
486 struct sg_table *sg)
487{
488 struct rockchip_drm_private *private = drm->dev_private;
489 struct rockchip_gem_object *rk_obj;
490 int ret;
491
492 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
493 if (IS_ERR(rk_obj))
494 return ERR_CAST(rk_obj);
495
496 if (private->domain)
497 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
498 else
499 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
500
501 if (ret < 0) {
502 DRM_ERROR("failed to import sg table: %d\n", ret);
503 goto err_free_rk_obj;
504 }
505
506 return &rk_obj->base;
507
508err_free_rk_obj:
509 rockchip_gem_release_object(rk_obj);
510 return ERR_PTR(ret);
511}
512
513int rockchip_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
514{
515 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
516
517 if (rk_obj->pages) {
518 void *vaddr;
519
520 if (rk_obj->kvaddr)
521 vaddr = rk_obj->kvaddr;
522 else
523 vaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
524 pgprot_writecombine(PAGE_KERNEL));
525
526 if (!vaddr)
527 return -ENOMEM;
528 iosys_map_set_vaddr(map, vaddr);
529 return 0;
530 }
531
532 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
533 return -ENOMEM;
534 iosys_map_set_vaddr(map, rk_obj->kvaddr);
535
536 return 0;
537}
538
539void rockchip_gem_prime_vunmap(struct drm_gem_object *obj,
540 struct iosys_map *map)
541{
542 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
543
544 if (rk_obj->pages) {
545 if (map->vaddr != rk_obj->kvaddr)
546 vunmap(map->vaddr);
547 return;
548 }
549
550 /* Nothing to do if allocated by DMA mapping API. */
551}