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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* exynos_drm_gem.c
3 *
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Author: Inki Dae <inki.dae@samsung.com>
6 */
7
8
9#include <linux/dma-buf.h>
10#include <linux/pfn_t.h>
11#include <linux/shmem_fs.h>
12#include <linux/module.h>
13
14#include <drm/drm_prime.h>
15#include <drm/drm_vma_manager.h>
16#include <drm/exynos_drm.h>
17
18#include "exynos_drm_drv.h"
19#include "exynos_drm_gem.h"
20
21MODULE_IMPORT_NS("DMA_BUF");
22
23static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
24
25static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
26{
27 struct drm_device *dev = exynos_gem->base.dev;
28 unsigned long attr = 0;
29
30 if (exynos_gem->dma_addr) {
31 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already allocated.\n");
32 return 0;
33 }
34
35 /*
36 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
37 * region will be allocated else physically contiguous
38 * as possible.
39 */
40 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
41 attr |= DMA_ATTR_FORCE_CONTIGUOUS;
42
43 /*
44 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
45 * else cachable mapping.
46 */
47 if (exynos_gem->flags & EXYNOS_BO_WC ||
48 !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
49 attr |= DMA_ATTR_WRITE_COMBINE;
50
51 /* FBDev emulation requires kernel mapping */
52 if (!kvmap)
53 attr |= DMA_ATTR_NO_KERNEL_MAPPING;
54
55 exynos_gem->dma_attrs = attr;
56 exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
57 &exynos_gem->dma_addr, GFP_KERNEL,
58 exynos_gem->dma_attrs);
59 if (!exynos_gem->cookie) {
60 DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate buffer.\n");
61 return -ENOMEM;
62 }
63
64 if (kvmap)
65 exynos_gem->kvaddr = exynos_gem->cookie;
66
67 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
68 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
69 return 0;
70}
71
72static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
73{
74 struct drm_device *dev = exynos_gem->base.dev;
75
76 if (!exynos_gem->dma_addr) {
77 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n");
78 return;
79 }
80
81 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
82 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
83
84 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
85 (dma_addr_t)exynos_gem->dma_addr,
86 exynos_gem->dma_attrs);
87}
88
89static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
90 struct drm_file *file_priv,
91 unsigned int *handle)
92{
93 int ret;
94
95 /*
96 * allocate a id of idr table where the obj is registered
97 * and handle has the id what user can see.
98 */
99 ret = drm_gem_handle_create(file_priv, obj, handle);
100 if (ret)
101 return ret;
102
103 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "gem handle = 0x%x\n", *handle);
104
105 /* drop reference from allocate - handle holds it now. */
106 drm_gem_object_put(obj);
107
108 return 0;
109}
110
111void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
112{
113 struct drm_gem_object *obj = &exynos_gem->base;
114
115 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "handle count = %d\n",
116 obj->handle_count);
117
118 /*
119 * do not release memory region from exporter.
120 *
121 * the region will be released by exporter
122 * once dmabuf's refcount becomes 0.
123 */
124 if (obj->import_attach)
125 drm_prime_gem_destroy(obj, exynos_gem->sgt);
126 else
127 exynos_drm_free_buf(exynos_gem);
128
129 /* release file pointer to gem object. */
130 drm_gem_object_release(obj);
131
132 kfree(exynos_gem);
133}
134
135static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
136 .open = drm_gem_vm_open,
137 .close = drm_gem_vm_close,
138};
139
140static const struct drm_gem_object_funcs exynos_drm_gem_object_funcs = {
141 .free = exynos_drm_gem_free_object,
142 .get_sg_table = exynos_drm_gem_prime_get_sg_table,
143 .mmap = exynos_drm_gem_mmap,
144 .vm_ops = &exynos_drm_gem_vm_ops,
145};
146
147static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
148 unsigned long size)
149{
150 struct exynos_drm_gem *exynos_gem;
151 struct drm_gem_object *obj;
152 int ret;
153
154 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
155 if (!exynos_gem)
156 return ERR_PTR(-ENOMEM);
157
158 exynos_gem->size = size;
159 obj = &exynos_gem->base;
160
161 obj->funcs = &exynos_drm_gem_object_funcs;
162
163 ret = drm_gem_object_init(dev, obj, size);
164 if (ret < 0) {
165 DRM_DEV_ERROR(dev->dev, "failed to initialize gem object\n");
166 kfree(exynos_gem);
167 return ERR_PTR(ret);
168 }
169
170 ret = drm_gem_create_mmap_offset(obj);
171 if (ret < 0) {
172 drm_gem_object_release(obj);
173 kfree(exynos_gem);
174 return ERR_PTR(ret);
175 }
176
177 DRM_DEV_DEBUG_KMS(dev->dev, "created file object = %pK\n", obj->filp);
178
179 return exynos_gem;
180}
181
182struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
183 unsigned int flags,
184 unsigned long size,
185 bool kvmap)
186{
187 struct exynos_drm_gem *exynos_gem;
188 int ret;
189
190 if (flags & ~(EXYNOS_BO_MASK)) {
191 DRM_DEV_ERROR(dev->dev,
192 "invalid GEM buffer flags: %u\n", flags);
193 return ERR_PTR(-EINVAL);
194 }
195
196 if (!size) {
197 DRM_DEV_ERROR(dev->dev, "invalid GEM buffer size: %lu\n", size);
198 return ERR_PTR(-EINVAL);
199 }
200
201 size = roundup(size, PAGE_SIZE);
202
203 exynos_gem = exynos_drm_gem_init(dev, size);
204 if (IS_ERR(exynos_gem))
205 return exynos_gem;
206
207 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
208 /*
209 * when no IOMMU is available, all allocated buffers are
210 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
211 */
212 flags &= ~EXYNOS_BO_NONCONTIG;
213 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
214 }
215
216 /* set memory type and cache attribute from user side. */
217 exynos_gem->flags = flags;
218
219 ret = exynos_drm_alloc_buf(exynos_gem, kvmap);
220 if (ret < 0) {
221 drm_gem_object_release(&exynos_gem->base);
222 kfree(exynos_gem);
223 return ERR_PTR(ret);
224 }
225
226 return exynos_gem;
227}
228
229int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
230 struct drm_file *file_priv)
231{
232 struct drm_exynos_gem_create *args = data;
233 struct exynos_drm_gem *exynos_gem;
234 int ret;
235
236 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size, false);
237 if (IS_ERR(exynos_gem))
238 return PTR_ERR(exynos_gem);
239
240 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
241 &args->handle);
242 if (ret) {
243 exynos_drm_gem_destroy(exynos_gem);
244 return ret;
245 }
246
247 return 0;
248}
249
250int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
251 struct drm_file *file_priv)
252{
253 struct drm_exynos_gem_map *args = data;
254
255 return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
256 &args->offset);
257}
258
259struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
260 unsigned int gem_handle)
261{
262 struct drm_gem_object *obj;
263
264 obj = drm_gem_object_lookup(filp, gem_handle);
265 if (!obj)
266 return NULL;
267 return to_exynos_gem(obj);
268}
269
270static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
271 struct vm_area_struct *vma)
272{
273 struct drm_device *drm_dev = exynos_gem->base.dev;
274 unsigned long vm_size;
275 int ret;
276
277 vm_flags_clear(vma, VM_PFNMAP);
278 vma->vm_pgoff = 0;
279
280 vm_size = vma->vm_end - vma->vm_start;
281
282 /* check if user-requested size is valid. */
283 if (vm_size > exynos_gem->size)
284 return -EINVAL;
285
286 ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
287 exynos_gem->dma_addr, exynos_gem->size,
288 exynos_gem->dma_attrs);
289 if (ret < 0) {
290 DRM_ERROR("failed to mmap.\n");
291 return ret;
292 }
293
294 return 0;
295}
296
297int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
298 struct drm_file *file_priv)
299{
300 struct exynos_drm_gem *exynos_gem;
301 struct drm_exynos_gem_info *args = data;
302 struct drm_gem_object *obj;
303
304 obj = drm_gem_object_lookup(file_priv, args->handle);
305 if (!obj) {
306 DRM_DEV_ERROR(dev->dev, "failed to lookup gem object.\n");
307 return -EINVAL;
308 }
309
310 exynos_gem = to_exynos_gem(obj);
311
312 args->flags = exynos_gem->flags;
313 args->size = exynos_gem->size;
314
315 drm_gem_object_put(obj);
316
317 return 0;
318}
319
320void exynos_drm_gem_free_object(struct drm_gem_object *obj)
321{
322 exynos_drm_gem_destroy(to_exynos_gem(obj));
323}
324
325int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
326 struct drm_device *dev,
327 struct drm_mode_create_dumb *args)
328{
329 struct exynos_drm_gem *exynos_gem;
330 unsigned int flags;
331 int ret;
332
333 /*
334 * allocate memory to be used for framebuffer.
335 * - this callback would be called by user application
336 * with DRM_IOCTL_MODE_CREATE_DUMB command.
337 */
338
339 args->pitch = args->width * ((args->bpp + 7) / 8);
340 args->size = args->pitch * args->height;
341
342 if (is_drm_iommu_supported(dev))
343 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
344 else
345 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
346
347 exynos_gem = exynos_drm_gem_create(dev, flags, args->size, false);
348 if (IS_ERR(exynos_gem)) {
349 dev_warn(dev->dev, "FB allocation failed.\n");
350 return PTR_ERR(exynos_gem);
351 }
352
353 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
354 &args->handle);
355 if (ret) {
356 exynos_drm_gem_destroy(exynos_gem);
357 return ret;
358 }
359
360 return 0;
361}
362
363static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
364{
365 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
366 int ret;
367
368 if (obj->import_attach)
369 return dma_buf_mmap(obj->dma_buf, vma, 0);
370
371 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
372
373 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
374 exynos_gem->flags);
375
376 /* non-cachable as default. */
377 if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
378 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
379 else if (exynos_gem->flags & EXYNOS_BO_WC)
380 vma->vm_page_prot =
381 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
382 else
383 vma->vm_page_prot =
384 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
385
386 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
387 if (ret)
388 goto err_close_vm;
389
390 return ret;
391
392err_close_vm:
393 drm_gem_vm_close(vma);
394
395 return ret;
396}
397
398/* low-level interface prime helpers */
399struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
400 struct dma_buf *dma_buf)
401{
402 return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
403}
404
405struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
406{
407 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
408 struct drm_device *drm_dev = obj->dev;
409 struct sg_table *sgt;
410 int ret;
411
412 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
413 if (!sgt)
414 return ERR_PTR(-ENOMEM);
415
416 ret = dma_get_sgtable_attrs(to_dma_dev(drm_dev), sgt, exynos_gem->cookie,
417 exynos_gem->dma_addr, exynos_gem->size,
418 exynos_gem->dma_attrs);
419 if (ret) {
420 DRM_ERROR("failed to get sgtable, %d\n", ret);
421 kfree(sgt);
422 return ERR_PTR(ret);
423 }
424
425 return sgt;
426}
427
428struct drm_gem_object *
429exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
430 struct dma_buf_attachment *attach,
431 struct sg_table *sgt)
432{
433 struct exynos_drm_gem *exynos_gem;
434
435 /* check if the entries in the sg_table are contiguous */
436 if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) {
437 DRM_ERROR("buffer chunks must be mapped contiguously");
438 return ERR_PTR(-EINVAL);
439 }
440
441 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
442 if (IS_ERR(exynos_gem))
443 return ERR_CAST(exynos_gem);
444
445 /*
446 * Buffer has been mapped as contiguous into DMA address space,
447 * but if there is IOMMU, it can be either CONTIG or NONCONTIG.
448 * We assume a simplified logic below:
449 */
450 if (is_drm_iommu_supported(dev))
451 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
452 else
453 exynos_gem->flags |= EXYNOS_BO_CONTIG;
454
455 exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
456 exynos_gem->sgt = sgt;
457 return &exynos_gem->base;
458}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* exynos_drm_gem.c
3 *
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Author: Inki Dae <inki.dae@samsung.com>
6 */
7
8
9#include <linux/dma-buf.h>
10#include <linux/pfn_t.h>
11#include <linux/shmem_fs.h>
12
13#include <drm/drm_prime.h>
14#include <drm/drm_vma_manager.h>
15#include <drm/exynos_drm.h>
16
17#include "exynos_drm_drv.h"
18#include "exynos_drm_gem.h"
19
20static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
21{
22 struct drm_device *dev = exynos_gem->base.dev;
23 unsigned long attr = 0;
24
25 if (exynos_gem->dma_addr) {
26 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already allocated.\n");
27 return 0;
28 }
29
30 /*
31 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
32 * region will be allocated else physically contiguous
33 * as possible.
34 */
35 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
36 attr |= DMA_ATTR_FORCE_CONTIGUOUS;
37
38 /*
39 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
40 * else cachable mapping.
41 */
42 if (exynos_gem->flags & EXYNOS_BO_WC ||
43 !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
44 attr |= DMA_ATTR_WRITE_COMBINE;
45 else
46 attr |= DMA_ATTR_NON_CONSISTENT;
47
48 /* FBDev emulation requires kernel mapping */
49 if (!kvmap)
50 attr |= DMA_ATTR_NO_KERNEL_MAPPING;
51
52 exynos_gem->dma_attrs = attr;
53 exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
54 &exynos_gem->dma_addr, GFP_KERNEL,
55 exynos_gem->dma_attrs);
56 if (!exynos_gem->cookie) {
57 DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate buffer.\n");
58 return -ENOMEM;
59 }
60
61 if (kvmap)
62 exynos_gem->kvaddr = exynos_gem->cookie;
63
64 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
65 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
66 return 0;
67}
68
69static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
70{
71 struct drm_device *dev = exynos_gem->base.dev;
72
73 if (!exynos_gem->dma_addr) {
74 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n");
75 return;
76 }
77
78 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
79 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
80
81 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
82 (dma_addr_t)exynos_gem->dma_addr,
83 exynos_gem->dma_attrs);
84}
85
86static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
87 struct drm_file *file_priv,
88 unsigned int *handle)
89{
90 int ret;
91
92 /*
93 * allocate a id of idr table where the obj is registered
94 * and handle has the id what user can see.
95 */
96 ret = drm_gem_handle_create(file_priv, obj, handle);
97 if (ret)
98 return ret;
99
100 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "gem handle = 0x%x\n", *handle);
101
102 /* drop reference from allocate - handle holds it now. */
103 drm_gem_object_put(obj);
104
105 return 0;
106}
107
108void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
109{
110 struct drm_gem_object *obj = &exynos_gem->base;
111
112 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "handle count = %d\n",
113 obj->handle_count);
114
115 /*
116 * do not release memory region from exporter.
117 *
118 * the region will be released by exporter
119 * once dmabuf's refcount becomes 0.
120 */
121 if (obj->import_attach)
122 drm_prime_gem_destroy(obj, exynos_gem->sgt);
123 else
124 exynos_drm_free_buf(exynos_gem);
125
126 /* release file pointer to gem object. */
127 drm_gem_object_release(obj);
128
129 kfree(exynos_gem);
130}
131
132static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
133 unsigned long size)
134{
135 struct exynos_drm_gem *exynos_gem;
136 struct drm_gem_object *obj;
137 int ret;
138
139 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
140 if (!exynos_gem)
141 return ERR_PTR(-ENOMEM);
142
143 exynos_gem->size = size;
144 obj = &exynos_gem->base;
145
146 ret = drm_gem_object_init(dev, obj, size);
147 if (ret < 0) {
148 DRM_DEV_ERROR(dev->dev, "failed to initialize gem object\n");
149 kfree(exynos_gem);
150 return ERR_PTR(ret);
151 }
152
153 ret = drm_gem_create_mmap_offset(obj);
154 if (ret < 0) {
155 drm_gem_object_release(obj);
156 kfree(exynos_gem);
157 return ERR_PTR(ret);
158 }
159
160 DRM_DEV_DEBUG_KMS(dev->dev, "created file object = %pK\n", obj->filp);
161
162 return exynos_gem;
163}
164
165struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
166 unsigned int flags,
167 unsigned long size,
168 bool kvmap)
169{
170 struct exynos_drm_gem *exynos_gem;
171 int ret;
172
173 if (flags & ~(EXYNOS_BO_MASK)) {
174 DRM_DEV_ERROR(dev->dev,
175 "invalid GEM buffer flags: %u\n", flags);
176 return ERR_PTR(-EINVAL);
177 }
178
179 if (!size) {
180 DRM_DEV_ERROR(dev->dev, "invalid GEM buffer size: %lu\n", size);
181 return ERR_PTR(-EINVAL);
182 }
183
184 size = roundup(size, PAGE_SIZE);
185
186 exynos_gem = exynos_drm_gem_init(dev, size);
187 if (IS_ERR(exynos_gem))
188 return exynos_gem;
189
190 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
191 /*
192 * when no IOMMU is available, all allocated buffers are
193 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
194 */
195 flags &= ~EXYNOS_BO_NONCONTIG;
196 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
197 }
198
199 /* set memory type and cache attribute from user side. */
200 exynos_gem->flags = flags;
201
202 ret = exynos_drm_alloc_buf(exynos_gem, kvmap);
203 if (ret < 0) {
204 drm_gem_object_release(&exynos_gem->base);
205 kfree(exynos_gem);
206 return ERR_PTR(ret);
207 }
208
209 return exynos_gem;
210}
211
212int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
213 struct drm_file *file_priv)
214{
215 struct drm_exynos_gem_create *args = data;
216 struct exynos_drm_gem *exynos_gem;
217 int ret;
218
219 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size, false);
220 if (IS_ERR(exynos_gem))
221 return PTR_ERR(exynos_gem);
222
223 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
224 &args->handle);
225 if (ret) {
226 exynos_drm_gem_destroy(exynos_gem);
227 return ret;
228 }
229
230 return 0;
231}
232
233int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
234 struct drm_file *file_priv)
235{
236 struct drm_exynos_gem_map *args = data;
237
238 return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
239 &args->offset);
240}
241
242struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
243 unsigned int gem_handle)
244{
245 struct drm_gem_object *obj;
246
247 obj = drm_gem_object_lookup(filp, gem_handle);
248 if (!obj)
249 return NULL;
250 return to_exynos_gem(obj);
251}
252
253static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
254 struct vm_area_struct *vma)
255{
256 struct drm_device *drm_dev = exynos_gem->base.dev;
257 unsigned long vm_size;
258 int ret;
259
260 vma->vm_flags &= ~VM_PFNMAP;
261 vma->vm_pgoff = 0;
262
263 vm_size = vma->vm_end - vma->vm_start;
264
265 /* check if user-requested size is valid. */
266 if (vm_size > exynos_gem->size)
267 return -EINVAL;
268
269 ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
270 exynos_gem->dma_addr, exynos_gem->size,
271 exynos_gem->dma_attrs);
272 if (ret < 0) {
273 DRM_ERROR("failed to mmap.\n");
274 return ret;
275 }
276
277 return 0;
278}
279
280int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
281 struct drm_file *file_priv)
282{
283 struct exynos_drm_gem *exynos_gem;
284 struct drm_exynos_gem_info *args = data;
285 struct drm_gem_object *obj;
286
287 obj = drm_gem_object_lookup(file_priv, args->handle);
288 if (!obj) {
289 DRM_DEV_ERROR(dev->dev, "failed to lookup gem object.\n");
290 return -EINVAL;
291 }
292
293 exynos_gem = to_exynos_gem(obj);
294
295 args->flags = exynos_gem->flags;
296 args->size = exynos_gem->size;
297
298 drm_gem_object_put(obj);
299
300 return 0;
301}
302
303void exynos_drm_gem_free_object(struct drm_gem_object *obj)
304{
305 exynos_drm_gem_destroy(to_exynos_gem(obj));
306}
307
308int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
309 struct drm_device *dev,
310 struct drm_mode_create_dumb *args)
311{
312 struct exynos_drm_gem *exynos_gem;
313 unsigned int flags;
314 int ret;
315
316 /*
317 * allocate memory to be used for framebuffer.
318 * - this callback would be called by user application
319 * with DRM_IOCTL_MODE_CREATE_DUMB command.
320 */
321
322 args->pitch = args->width * ((args->bpp + 7) / 8);
323 args->size = args->pitch * args->height;
324
325 if (is_drm_iommu_supported(dev))
326 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
327 else
328 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
329
330 exynos_gem = exynos_drm_gem_create(dev, flags, args->size, false);
331 if (IS_ERR(exynos_gem)) {
332 dev_warn(dev->dev, "FB allocation failed.\n");
333 return PTR_ERR(exynos_gem);
334 }
335
336 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
337 &args->handle);
338 if (ret) {
339 exynos_drm_gem_destroy(exynos_gem);
340 return ret;
341 }
342
343 return 0;
344}
345
346static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
347 struct vm_area_struct *vma)
348{
349 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
350 int ret;
351
352 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
353 exynos_gem->flags);
354
355 /* non-cachable as default. */
356 if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
357 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
358 else if (exynos_gem->flags & EXYNOS_BO_WC)
359 vma->vm_page_prot =
360 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
361 else
362 vma->vm_page_prot =
363 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
364
365 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
366 if (ret)
367 goto err_close_vm;
368
369 return ret;
370
371err_close_vm:
372 drm_gem_vm_close(vma);
373
374 return ret;
375}
376
377int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
378{
379 struct drm_gem_object *obj;
380 int ret;
381
382 /* set vm_area_struct. */
383 ret = drm_gem_mmap(filp, vma);
384 if (ret < 0) {
385 DRM_ERROR("failed to mmap.\n");
386 return ret;
387 }
388
389 obj = vma->vm_private_data;
390
391 if (obj->import_attach)
392 return dma_buf_mmap(obj->dma_buf, vma, 0);
393
394 return exynos_drm_gem_mmap_obj(obj, vma);
395}
396
397/* low-level interface prime helpers */
398struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
399 struct dma_buf *dma_buf)
400{
401 return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
402}
403
404struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
405{
406 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
407 struct drm_device *drm_dev = obj->dev;
408 struct sg_table *sgt;
409 int ret;
410
411 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
412 if (!sgt)
413 return ERR_PTR(-ENOMEM);
414
415 ret = dma_get_sgtable_attrs(to_dma_dev(drm_dev), sgt, exynos_gem->cookie,
416 exynos_gem->dma_addr, exynos_gem->size,
417 exynos_gem->dma_attrs);
418 if (ret) {
419 DRM_ERROR("failed to get sgtable, %d\n", ret);
420 kfree(sgt);
421 return ERR_PTR(ret);
422 }
423
424 return sgt;
425}
426
427struct drm_gem_object *
428exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
429 struct dma_buf_attachment *attach,
430 struct sg_table *sgt)
431{
432 struct exynos_drm_gem *exynos_gem;
433
434 if (sgt->nents < 1)
435 return ERR_PTR(-EINVAL);
436
437 /*
438 * Check if the provided buffer has been mapped as contiguous
439 * into DMA address space.
440 */
441 if (sgt->nents > 1) {
442 dma_addr_t next_addr = sg_dma_address(sgt->sgl);
443 struct scatterlist *s;
444 unsigned int i;
445
446 for_each_sg(sgt->sgl, s, sgt->nents, i) {
447 if (!sg_dma_len(s))
448 break;
449 if (sg_dma_address(s) != next_addr) {
450 DRM_ERROR("buffer chunks must be mapped contiguously");
451 return ERR_PTR(-EINVAL);
452 }
453 next_addr = sg_dma_address(s) + sg_dma_len(s);
454 }
455 }
456
457 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
458 if (IS_ERR(exynos_gem))
459 return ERR_CAST(exynos_gem);
460
461 /*
462 * Buffer has been mapped as contiguous into DMA address space,
463 * but if there is IOMMU, it can be either CONTIG or NONCONTIG.
464 * We assume a simplified logic below:
465 */
466 if (is_drm_iommu_supported(dev))
467 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
468 else
469 exynos_gem->flags |= EXYNOS_BO_CONTIG;
470
471 exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
472 exynos_gem->sgt = sgt;
473 return &exynos_gem->base;
474}
475
476void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
477{
478 return NULL;
479}
480
481void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
482{
483 /* Nothing to do */
484}
485
486int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
487 struct vm_area_struct *vma)
488{
489 int ret;
490
491 ret = drm_gem_mmap_obj(obj, obj->size, vma);
492 if (ret < 0)
493 return ret;
494
495 return exynos_drm_gem_mmap_obj(obj, vma);
496}