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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/* exynos_drm_gem.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <drm/drmP.h>
13#include <drm/drm_vma_manager.h>
14
15#include <linux/shmem_fs.h>
16#include <linux/dma-buf.h>
17#include <linux/pfn_t.h>
18#include <drm/exynos_drm.h>
19
20#include "exynos_drm_drv.h"
21#include "exynos_drm_gem.h"
22#include "exynos_drm_iommu.h"
23
24static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
25{
26 struct drm_device *dev = exynos_gem->base.dev;
27 unsigned long attr;
28 unsigned int nr_pages;
29 struct sg_table sgt;
30 int ret = -ENOMEM;
31
32 if (exynos_gem->dma_addr) {
33 DRM_DEBUG_KMS("already allocated.\n");
34 return 0;
35 }
36
37 exynos_gem->dma_attrs = 0;
38
39 /*
40 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
41 * region will be allocated else physically contiguous
42 * as possible.
43 */
44 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
45 exynos_gem->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;
46
47 /*
48 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
49 * else cachable mapping.
50 */
51 if (exynos_gem->flags & EXYNOS_BO_WC ||
52 !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
53 attr = DMA_ATTR_WRITE_COMBINE;
54 else
55 attr = DMA_ATTR_NON_CONSISTENT;
56
57 exynos_gem->dma_attrs |= attr;
58 exynos_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
59
60 nr_pages = exynos_gem->size >> PAGE_SHIFT;
61
62 exynos_gem->pages = kvmalloc_array(nr_pages, sizeof(struct page *),
63 GFP_KERNEL | __GFP_ZERO);
64 if (!exynos_gem->pages) {
65 DRM_ERROR("failed to allocate pages.\n");
66 return -ENOMEM;
67 }
68
69 exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
70 &exynos_gem->dma_addr, GFP_KERNEL,
71 exynos_gem->dma_attrs);
72 if (!exynos_gem->cookie) {
73 DRM_ERROR("failed to allocate buffer.\n");
74 goto err_free;
75 }
76
77 ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
78 exynos_gem->dma_addr, exynos_gem->size,
79 exynos_gem->dma_attrs);
80 if (ret < 0) {
81 DRM_ERROR("failed to get sgtable.\n");
82 goto err_dma_free;
83 }
84
85 if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
86 nr_pages)) {
87 DRM_ERROR("invalid sgtable.\n");
88 ret = -EINVAL;
89 goto err_sgt_free;
90 }
91
92 sg_free_table(&sgt);
93
94 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
95 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
96
97 return 0;
98
99err_sgt_free:
100 sg_free_table(&sgt);
101err_dma_free:
102 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
103 exynos_gem->dma_addr, exynos_gem->dma_attrs);
104err_free:
105 kvfree(exynos_gem->pages);
106
107 return ret;
108}
109
110static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
111{
112 struct drm_device *dev = exynos_gem->base.dev;
113
114 if (!exynos_gem->dma_addr) {
115 DRM_DEBUG_KMS("dma_addr is invalid.\n");
116 return;
117 }
118
119 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
120 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
121
122 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
123 (dma_addr_t)exynos_gem->dma_addr,
124 exynos_gem->dma_attrs);
125
126 kvfree(exynos_gem->pages);
127}
128
129static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
130 struct drm_file *file_priv,
131 unsigned int *handle)
132{
133 int ret;
134
135 /*
136 * allocate a id of idr table where the obj is registered
137 * and handle has the id what user can see.
138 */
139 ret = drm_gem_handle_create(file_priv, obj, handle);
140 if (ret)
141 return ret;
142
143 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
144
145 /* drop reference from allocate - handle holds it now. */
146 drm_gem_object_unreference_unlocked(obj);
147
148 return 0;
149}
150
151void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
152{
153 struct drm_gem_object *obj = &exynos_gem->base;
154
155 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
156
157 /*
158 * do not release memory region from exporter.
159 *
160 * the region will be released by exporter
161 * once dmabuf's refcount becomes 0.
162 */
163 if (obj->import_attach)
164 drm_prime_gem_destroy(obj, exynos_gem->sgt);
165 else
166 exynos_drm_free_buf(exynos_gem);
167
168 /* release file pointer to gem object. */
169 drm_gem_object_release(obj);
170
171 kfree(exynos_gem);
172}
173
174unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
175 unsigned int gem_handle,
176 struct drm_file *file_priv)
177{
178 struct exynos_drm_gem *exynos_gem;
179 struct drm_gem_object *obj;
180
181 obj = drm_gem_object_lookup(file_priv, gem_handle);
182 if (!obj) {
183 DRM_ERROR("failed to lookup gem object.\n");
184 return 0;
185 }
186
187 exynos_gem = to_exynos_gem(obj);
188
189 drm_gem_object_unreference_unlocked(obj);
190
191 return exynos_gem->size;
192}
193
194static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
195 unsigned long size)
196{
197 struct exynos_drm_gem *exynos_gem;
198 struct drm_gem_object *obj;
199 int ret;
200
201 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
202 if (!exynos_gem)
203 return ERR_PTR(-ENOMEM);
204
205 exynos_gem->size = size;
206 obj = &exynos_gem->base;
207
208 ret = drm_gem_object_init(dev, obj, size);
209 if (ret < 0) {
210 DRM_ERROR("failed to initialize gem object\n");
211 kfree(exynos_gem);
212 return ERR_PTR(ret);
213 }
214
215 ret = drm_gem_create_mmap_offset(obj);
216 if (ret < 0) {
217 drm_gem_object_release(obj);
218 kfree(exynos_gem);
219 return ERR_PTR(ret);
220 }
221
222 DRM_DEBUG_KMS("created file object = %pK\n", obj->filp);
223
224 return exynos_gem;
225}
226
227struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
228 unsigned int flags,
229 unsigned long size)
230{
231 struct exynos_drm_gem *exynos_gem;
232 int ret;
233
234 if (flags & ~(EXYNOS_BO_MASK)) {
235 DRM_ERROR("invalid GEM buffer flags: %u\n", flags);
236 return ERR_PTR(-EINVAL);
237 }
238
239 if (!size) {
240 DRM_ERROR("invalid GEM buffer size: %lu\n", size);
241 return ERR_PTR(-EINVAL);
242 }
243
244 size = roundup(size, PAGE_SIZE);
245
246 exynos_gem = exynos_drm_gem_init(dev, size);
247 if (IS_ERR(exynos_gem))
248 return exynos_gem;
249
250 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
251 /*
252 * when no IOMMU is available, all allocated buffers are
253 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
254 */
255 flags &= ~EXYNOS_BO_NONCONTIG;
256 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
257 }
258
259 /* set memory type and cache attribute from user side. */
260 exynos_gem->flags = flags;
261
262 ret = exynos_drm_alloc_buf(exynos_gem);
263 if (ret < 0) {
264 drm_gem_object_release(&exynos_gem->base);
265 kfree(exynos_gem);
266 return ERR_PTR(ret);
267 }
268
269 return exynos_gem;
270}
271
272int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
273 struct drm_file *file_priv)
274{
275 struct drm_exynos_gem_create *args = data;
276 struct exynos_drm_gem *exynos_gem;
277 int ret;
278
279 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
280 if (IS_ERR(exynos_gem))
281 return PTR_ERR(exynos_gem);
282
283 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
284 &args->handle);
285 if (ret) {
286 exynos_drm_gem_destroy(exynos_gem);
287 return ret;
288 }
289
290 return 0;
291}
292
293int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
294 struct drm_file *file_priv)
295{
296 struct drm_exynos_gem_map *args = data;
297
298 return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
299 &args->offset);
300}
301
302dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
303 unsigned int gem_handle,
304 struct drm_file *filp)
305{
306 struct exynos_drm_gem *exynos_gem;
307 struct drm_gem_object *obj;
308
309 obj = drm_gem_object_lookup(filp, gem_handle);
310 if (!obj) {
311 DRM_ERROR("failed to lookup gem object.\n");
312 return ERR_PTR(-EINVAL);
313 }
314
315 exynos_gem = to_exynos_gem(obj);
316
317 return &exynos_gem->dma_addr;
318}
319
320void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
321 unsigned int gem_handle,
322 struct drm_file *filp)
323{
324 struct drm_gem_object *obj;
325
326 obj = drm_gem_object_lookup(filp, gem_handle);
327 if (!obj) {
328 DRM_ERROR("failed to lookup gem object.\n");
329 return;
330 }
331
332 drm_gem_object_unreference_unlocked(obj);
333
334 /*
335 * decrease obj->refcount one more time because we has already
336 * increased it at exynos_drm_gem_get_dma_addr().
337 */
338 drm_gem_object_unreference_unlocked(obj);
339}
340
341static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
342 struct vm_area_struct *vma)
343{
344 struct drm_device *drm_dev = exynos_gem->base.dev;
345 unsigned long vm_size;
346 int ret;
347
348 vma->vm_flags &= ~VM_PFNMAP;
349 vma->vm_pgoff = 0;
350
351 vm_size = vma->vm_end - vma->vm_start;
352
353 /* check if user-requested size is valid. */
354 if (vm_size > exynos_gem->size)
355 return -EINVAL;
356
357 ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
358 exynos_gem->dma_addr, exynos_gem->size,
359 exynos_gem->dma_attrs);
360 if (ret < 0) {
361 DRM_ERROR("failed to mmap.\n");
362 return ret;
363 }
364
365 return 0;
366}
367
368int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
369 struct drm_file *file_priv)
370{
371 struct exynos_drm_gem *exynos_gem;
372 struct drm_exynos_gem_info *args = data;
373 struct drm_gem_object *obj;
374
375 obj = drm_gem_object_lookup(file_priv, args->handle);
376 if (!obj) {
377 DRM_ERROR("failed to lookup gem object.\n");
378 return -EINVAL;
379 }
380
381 exynos_gem = to_exynos_gem(obj);
382
383 args->flags = exynos_gem->flags;
384 args->size = exynos_gem->size;
385
386 drm_gem_object_unreference_unlocked(obj);
387
388 return 0;
389}
390
391void exynos_drm_gem_free_object(struct drm_gem_object *obj)
392{
393 exynos_drm_gem_destroy(to_exynos_gem(obj));
394}
395
396int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
397 struct drm_device *dev,
398 struct drm_mode_create_dumb *args)
399{
400 struct exynos_drm_gem *exynos_gem;
401 unsigned int flags;
402 int ret;
403
404 /*
405 * allocate memory to be used for framebuffer.
406 * - this callback would be called by user application
407 * with DRM_IOCTL_MODE_CREATE_DUMB command.
408 */
409
410 args->pitch = args->width * ((args->bpp + 7) / 8);
411 args->size = args->pitch * args->height;
412
413 if (is_drm_iommu_supported(dev))
414 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
415 else
416 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
417
418 exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
419 if (IS_ERR(exynos_gem)) {
420 dev_warn(dev->dev, "FB allocation failed.\n");
421 return PTR_ERR(exynos_gem);
422 }
423
424 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
425 &args->handle);
426 if (ret) {
427 exynos_drm_gem_destroy(exynos_gem);
428 return ret;
429 }
430
431 return 0;
432}
433
434int exynos_drm_gem_fault(struct vm_fault *vmf)
435{
436 struct vm_area_struct *vma = vmf->vma;
437 struct drm_gem_object *obj = vma->vm_private_data;
438 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
439 unsigned long pfn;
440 pgoff_t page_offset;
441 int ret;
442
443 page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
444
445 if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
446 DRM_ERROR("invalid page offset\n");
447 ret = -EINVAL;
448 goto out;
449 }
450
451 pfn = page_to_pfn(exynos_gem->pages[page_offset]);
452 ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
453
454out:
455 switch (ret) {
456 case 0:
457 case -ERESTARTSYS:
458 case -EINTR:
459 return VM_FAULT_NOPAGE;
460 case -ENOMEM:
461 return VM_FAULT_OOM;
462 default:
463 return VM_FAULT_SIGBUS;
464 }
465}
466
467static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
468 struct vm_area_struct *vma)
469{
470 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
471 int ret;
472
473 DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
474
475 /* non-cachable as default. */
476 if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
477 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
478 else if (exynos_gem->flags & EXYNOS_BO_WC)
479 vma->vm_page_prot =
480 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
481 else
482 vma->vm_page_prot =
483 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
484
485 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
486 if (ret)
487 goto err_close_vm;
488
489 return ret;
490
491err_close_vm:
492 drm_gem_vm_close(vma);
493
494 return ret;
495}
496
497int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
498{
499 struct drm_gem_object *obj;
500 int ret;
501
502 /* set vm_area_struct. */
503 ret = drm_gem_mmap(filp, vma);
504 if (ret < 0) {
505 DRM_ERROR("failed to mmap.\n");
506 return ret;
507 }
508
509 obj = vma->vm_private_data;
510
511 if (obj->import_attach)
512 return dma_buf_mmap(obj->dma_buf, vma, 0);
513
514 return exynos_drm_gem_mmap_obj(obj, vma);
515}
516
517/* low-level interface prime helpers */
518struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
519 struct dma_buf *dma_buf)
520{
521 return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
522}
523
524struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
525{
526 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
527 int npages;
528
529 npages = exynos_gem->size >> PAGE_SHIFT;
530
531 return drm_prime_pages_to_sg(exynos_gem->pages, npages);
532}
533
534struct drm_gem_object *
535exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
536 struct dma_buf_attachment *attach,
537 struct sg_table *sgt)
538{
539 struct exynos_drm_gem *exynos_gem;
540 int npages;
541 int ret;
542
543 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
544 if (IS_ERR(exynos_gem)) {
545 ret = PTR_ERR(exynos_gem);
546 return ERR_PTR(ret);
547 }
548
549 exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
550
551 npages = exynos_gem->size >> PAGE_SHIFT;
552 exynos_gem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
553 if (!exynos_gem->pages) {
554 ret = -ENOMEM;
555 goto err;
556 }
557
558 ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
559 npages);
560 if (ret < 0)
561 goto err_free_large;
562
563 exynos_gem->sgt = sgt;
564
565 if (sgt->nents == 1) {
566 /* always physically continuous memory if sgt->nents is 1. */
567 exynos_gem->flags |= EXYNOS_BO_CONTIG;
568 } else {
569 /*
570 * this case could be CONTIG or NONCONTIG type but for now
571 * sets NONCONTIG.
572 * TODO. we have to find a way that exporter can notify
573 * the type of its own buffer to importer.
574 */
575 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
576 }
577
578 return &exynos_gem->base;
579
580err_free_large:
581 kvfree(exynos_gem->pages);
582err:
583 drm_gem_object_release(&exynos_gem->base);
584 kfree(exynos_gem);
585 return ERR_PTR(ret);
586}
587
588void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
589{
590 return NULL;
591}
592
593void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
594{
595 /* Nothing to do */
596}
597
598int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
599 struct vm_area_struct *vma)
600{
601 int ret;
602
603 ret = drm_gem_mmap_obj(obj, obj->size, vma);
604 if (ret < 0)
605 return ret;
606
607 return exynos_drm_gem_mmap_obj(obj, vma);
608}