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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 <drm/exynos_drm.h>
17
18#include "exynos_drm_drv.h"
19#include "exynos_drm_gem.h"
20#include "exynos_drm_buf.h"
21#include "exynos_drm_iommu.h"
22
23static unsigned int convert_to_vm_err_msg(int msg)
24{
25 unsigned int out_msg;
26
27 switch (msg) {
28 case 0:
29 case -ERESTARTSYS:
30 case -EINTR:
31 out_msg = VM_FAULT_NOPAGE;
32 break;
33
34 case -ENOMEM:
35 out_msg = VM_FAULT_OOM;
36 break;
37
38 default:
39 out_msg = VM_FAULT_SIGBUS;
40 break;
41 }
42
43 return out_msg;
44}
45
46static int check_gem_flags(unsigned int flags)
47{
48 if (flags & ~(EXYNOS_BO_MASK)) {
49 DRM_ERROR("invalid flags.\n");
50 return -EINVAL;
51 }
52
53 return 0;
54}
55
56static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
57 struct vm_area_struct *vma)
58{
59 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
60
61 /* non-cachable as default. */
62 if (obj->flags & EXYNOS_BO_CACHABLE)
63 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
64 else if (obj->flags & EXYNOS_BO_WC)
65 vma->vm_page_prot =
66 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
67 else
68 vma->vm_page_prot =
69 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
70}
71
72static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
73{
74 /* TODO */
75
76 return roundup(size, PAGE_SIZE);
77}
78
79static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
80 struct vm_area_struct *vma,
81 unsigned long f_vaddr,
82 pgoff_t page_offset)
83{
84 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
85 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
86 struct scatterlist *sgl;
87 unsigned long pfn;
88 int i;
89
90 if (!buf->sgt)
91 return -EINTR;
92
93 if (page_offset >= (buf->size >> PAGE_SHIFT)) {
94 DRM_ERROR("invalid page offset\n");
95 return -EINVAL;
96 }
97
98 sgl = buf->sgt->sgl;
99 for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
100 if (page_offset < (sgl->length >> PAGE_SHIFT))
101 break;
102 page_offset -= (sgl->length >> PAGE_SHIFT);
103 }
104
105 pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
106
107 return vm_insert_mixed(vma, f_vaddr, pfn);
108}
109
110static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
111 struct drm_file *file_priv,
112 unsigned int *handle)
113{
114 int ret;
115
116 /*
117 * allocate a id of idr table where the obj is registered
118 * and handle has the id what user can see.
119 */
120 ret = drm_gem_handle_create(file_priv, obj, handle);
121 if (ret)
122 return ret;
123
124 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
125
126 /* drop reference from allocate - handle holds it now. */
127 drm_gem_object_unreference_unlocked(obj);
128
129 return 0;
130}
131
132void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
133{
134 struct drm_gem_object *obj;
135 struct exynos_drm_gem_buf *buf;
136
137 obj = &exynos_gem_obj->base;
138 buf = exynos_gem_obj->buffer;
139
140 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
141
142 /*
143 * do not release memory region from exporter.
144 *
145 * the region will be released by exporter
146 * once dmabuf's refcount becomes 0.
147 */
148 if (obj->import_attach)
149 goto out;
150
151 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
152
153out:
154 exynos_drm_fini_buf(obj->dev, buf);
155 exynos_gem_obj->buffer = NULL;
156
157 drm_gem_free_mmap_offset(obj);
158
159 /* release file pointer to gem object. */
160 drm_gem_object_release(obj);
161
162 kfree(exynos_gem_obj);
163 exynos_gem_obj = NULL;
164}
165
166unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
167 unsigned int gem_handle,
168 struct drm_file *file_priv)
169{
170 struct exynos_drm_gem_obj *exynos_gem_obj;
171 struct drm_gem_object *obj;
172
173 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
174 if (!obj) {
175 DRM_ERROR("failed to lookup gem object.\n");
176 return 0;
177 }
178
179 exynos_gem_obj = to_exynos_gem_obj(obj);
180
181 drm_gem_object_unreference_unlocked(obj);
182
183 return exynos_gem_obj->buffer->size;
184}
185
186
187struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
188 unsigned long size)
189{
190 struct exynos_drm_gem_obj *exynos_gem_obj;
191 struct drm_gem_object *obj;
192 int ret;
193
194 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
195 if (!exynos_gem_obj)
196 return NULL;
197
198 exynos_gem_obj->size = size;
199 obj = &exynos_gem_obj->base;
200
201 ret = drm_gem_object_init(dev, obj, size);
202 if (ret < 0) {
203 DRM_ERROR("failed to initialize gem object\n");
204 kfree(exynos_gem_obj);
205 return NULL;
206 }
207
208 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
209
210 return exynos_gem_obj;
211}
212
213struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
214 unsigned int flags,
215 unsigned long size)
216{
217 struct exynos_drm_gem_obj *exynos_gem_obj;
218 struct exynos_drm_gem_buf *buf;
219 int ret;
220
221 if (!size) {
222 DRM_ERROR("invalid size.\n");
223 return ERR_PTR(-EINVAL);
224 }
225
226 size = roundup_gem_size(size, flags);
227
228 ret = check_gem_flags(flags);
229 if (ret)
230 return ERR_PTR(ret);
231
232 buf = exynos_drm_init_buf(dev, size);
233 if (!buf)
234 return ERR_PTR(-ENOMEM);
235
236 exynos_gem_obj = exynos_drm_gem_init(dev, size);
237 if (!exynos_gem_obj) {
238 ret = -ENOMEM;
239 goto err_fini_buf;
240 }
241
242 exynos_gem_obj->buffer = buf;
243
244 /* set memory type and cache attribute from user side. */
245 exynos_gem_obj->flags = flags;
246
247 ret = exynos_drm_alloc_buf(dev, buf, flags);
248 if (ret < 0)
249 goto err_gem_fini;
250
251 return exynos_gem_obj;
252
253err_gem_fini:
254 drm_gem_object_release(&exynos_gem_obj->base);
255 kfree(exynos_gem_obj);
256err_fini_buf:
257 exynos_drm_fini_buf(dev, buf);
258 return ERR_PTR(ret);
259}
260
261int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
262 struct drm_file *file_priv)
263{
264 struct drm_exynos_gem_create *args = data;
265 struct exynos_drm_gem_obj *exynos_gem_obj;
266 int ret;
267
268 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
269 if (IS_ERR(exynos_gem_obj))
270 return PTR_ERR(exynos_gem_obj);
271
272 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
273 &args->handle);
274 if (ret) {
275 exynos_drm_gem_destroy(exynos_gem_obj);
276 return ret;
277 }
278
279 return 0;
280}
281
282dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
283 unsigned int gem_handle,
284 struct drm_file *filp)
285{
286 struct exynos_drm_gem_obj *exynos_gem_obj;
287 struct drm_gem_object *obj;
288
289 obj = drm_gem_object_lookup(dev, filp, gem_handle);
290 if (!obj) {
291 DRM_ERROR("failed to lookup gem object.\n");
292 return ERR_PTR(-EINVAL);
293 }
294
295 exynos_gem_obj = to_exynos_gem_obj(obj);
296
297 return &exynos_gem_obj->buffer->dma_addr;
298}
299
300void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
301 unsigned int gem_handle,
302 struct drm_file *filp)
303{
304 struct exynos_drm_gem_obj *exynos_gem_obj;
305 struct drm_gem_object *obj;
306
307 obj = drm_gem_object_lookup(dev, filp, gem_handle);
308 if (!obj) {
309 DRM_ERROR("failed to lookup gem object.\n");
310 return;
311 }
312
313 exynos_gem_obj = to_exynos_gem_obj(obj);
314
315 drm_gem_object_unreference_unlocked(obj);
316
317 /*
318 * decrease obj->refcount one more time because we has already
319 * increased it at exynos_drm_gem_get_dma_addr().
320 */
321 drm_gem_object_unreference_unlocked(obj);
322}
323
324int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
325 struct drm_file *file_priv)
326{
327 struct drm_exynos_gem_map_off *args = data;
328
329 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
330 args->handle, (unsigned long)args->offset);
331
332 if (!(dev->driver->driver_features & DRIVER_GEM)) {
333 DRM_ERROR("does not support GEM.\n");
334 return -ENODEV;
335 }
336
337 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
338 &args->offset);
339}
340
341int exynos_drm_gem_mmap_buffer(struct file *filp,
342 struct vm_area_struct *vma)
343{
344 struct drm_gem_object *obj = filp->private_data;
345 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
346 struct drm_device *drm_dev = obj->dev;
347 struct exynos_drm_gem_buf *buffer;
348 unsigned long vm_size;
349 int ret;
350
351 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
352
353 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
354 vma->vm_private_data = obj;
355 vma->vm_ops = drm_dev->driver->gem_vm_ops;
356
357 update_vm_cache_attr(exynos_gem_obj, vma);
358
359 vm_size = vma->vm_end - vma->vm_start;
360
361 /*
362 * a buffer contains information to physically continuous memory
363 * allocated by user request or at framebuffer creation.
364 */
365 buffer = exynos_gem_obj->buffer;
366
367 /* check if user-requested size is valid. */
368 if (vm_size > buffer->size)
369 return -EINVAL;
370
371 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
372 buffer->dma_addr, buffer->size,
373 &buffer->dma_attrs);
374 if (ret < 0) {
375 DRM_ERROR("failed to mmap.\n");
376 return ret;
377 }
378
379 /*
380 * take a reference to this mapping of the object. And this reference
381 * is unreferenced by the corresponding vm_close call.
382 */
383 drm_gem_object_reference(obj);
384
385 drm_vm_open_locked(drm_dev, vma);
386
387 return 0;
388}
389
390int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
391 struct drm_file *file_priv)
392{
393 struct drm_exynos_file_private *exynos_file_priv;
394 struct drm_exynos_gem_mmap *args = data;
395 struct drm_gem_object *obj;
396 struct file *anon_filp;
397 unsigned long addr;
398
399 if (!(dev->driver->driver_features & DRIVER_GEM)) {
400 DRM_ERROR("does not support GEM.\n");
401 return -ENODEV;
402 }
403
404 mutex_lock(&dev->struct_mutex);
405
406 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
407 if (!obj) {
408 DRM_ERROR("failed to lookup gem object.\n");
409 mutex_unlock(&dev->struct_mutex);
410 return -EINVAL;
411 }
412
413 exynos_file_priv = file_priv->driver_priv;
414 anon_filp = exynos_file_priv->anon_filp;
415 anon_filp->private_data = obj;
416
417 addr = vm_mmap(anon_filp, 0, args->size, PROT_READ | PROT_WRITE,
418 MAP_SHARED, 0);
419
420 drm_gem_object_unreference(obj);
421
422 if (IS_ERR_VALUE(addr)) {
423 mutex_unlock(&dev->struct_mutex);
424 return (int)addr;
425 }
426
427 mutex_unlock(&dev->struct_mutex);
428
429 args->mapped = addr;
430
431 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
432
433 return 0;
434}
435
436int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
437 struct drm_file *file_priv)
438{ struct exynos_drm_gem_obj *exynos_gem_obj;
439 struct drm_exynos_gem_info *args = data;
440 struct drm_gem_object *obj;
441
442 mutex_lock(&dev->struct_mutex);
443
444 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
445 if (!obj) {
446 DRM_ERROR("failed to lookup gem object.\n");
447 mutex_unlock(&dev->struct_mutex);
448 return -EINVAL;
449 }
450
451 exynos_gem_obj = to_exynos_gem_obj(obj);
452
453 args->flags = exynos_gem_obj->flags;
454 args->size = exynos_gem_obj->size;
455
456 drm_gem_object_unreference(obj);
457 mutex_unlock(&dev->struct_mutex);
458
459 return 0;
460}
461
462struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
463{
464 struct vm_area_struct *vma_copy;
465
466 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
467 if (!vma_copy)
468 return NULL;
469
470 if (vma->vm_ops && vma->vm_ops->open)
471 vma->vm_ops->open(vma);
472
473 if (vma->vm_file)
474 get_file(vma->vm_file);
475
476 memcpy(vma_copy, vma, sizeof(*vma));
477
478 vma_copy->vm_mm = NULL;
479 vma_copy->vm_next = NULL;
480 vma_copy->vm_prev = NULL;
481
482 return vma_copy;
483}
484
485void exynos_gem_put_vma(struct vm_area_struct *vma)
486{
487 if (!vma)
488 return;
489
490 if (vma->vm_ops && vma->vm_ops->close)
491 vma->vm_ops->close(vma);
492
493 if (vma->vm_file)
494 fput(vma->vm_file);
495
496 kfree(vma);
497}
498
499int exynos_gem_get_pages_from_userptr(unsigned long start,
500 unsigned int npages,
501 struct page **pages,
502 struct vm_area_struct *vma)
503{
504 int get_npages;
505
506 /* the memory region mmaped with VM_PFNMAP. */
507 if (vma_is_io(vma)) {
508 unsigned int i;
509
510 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
511 unsigned long pfn;
512 int ret = follow_pfn(vma, start, &pfn);
513 if (ret)
514 return ret;
515
516 pages[i] = pfn_to_page(pfn);
517 }
518
519 if (i != npages) {
520 DRM_ERROR("failed to get user_pages.\n");
521 return -EINVAL;
522 }
523
524 return 0;
525 }
526
527 get_npages = get_user_pages(current, current->mm, start,
528 npages, 1, 1, pages, NULL);
529 get_npages = max(get_npages, 0);
530 if (get_npages != npages) {
531 DRM_ERROR("failed to get user_pages.\n");
532 while (get_npages)
533 put_page(pages[--get_npages]);
534 return -EFAULT;
535 }
536
537 return 0;
538}
539
540void exynos_gem_put_pages_to_userptr(struct page **pages,
541 unsigned int npages,
542 struct vm_area_struct *vma)
543{
544 if (!vma_is_io(vma)) {
545 unsigned int i;
546
547 for (i = 0; i < npages; i++) {
548 set_page_dirty_lock(pages[i]);
549
550 /*
551 * undo the reference we took when populating
552 * the table.
553 */
554 put_page(pages[i]);
555 }
556 }
557}
558
559int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
560 struct sg_table *sgt,
561 enum dma_data_direction dir)
562{
563 int nents;
564
565 mutex_lock(&drm_dev->struct_mutex);
566
567 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
568 if (!nents) {
569 DRM_ERROR("failed to map sgl with dma.\n");
570 mutex_unlock(&drm_dev->struct_mutex);
571 return nents;
572 }
573
574 mutex_unlock(&drm_dev->struct_mutex);
575 return 0;
576}
577
578void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
579 struct sg_table *sgt,
580 enum dma_data_direction dir)
581{
582 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
583}
584
585void exynos_drm_gem_free_object(struct drm_gem_object *obj)
586{
587 struct exynos_drm_gem_obj *exynos_gem_obj;
588 struct exynos_drm_gem_buf *buf;
589
590 exynos_gem_obj = to_exynos_gem_obj(obj);
591 buf = exynos_gem_obj->buffer;
592
593 if (obj->import_attach)
594 drm_prime_gem_destroy(obj, buf->sgt);
595
596 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
597}
598
599int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
600 struct drm_device *dev,
601 struct drm_mode_create_dumb *args)
602{
603 struct exynos_drm_gem_obj *exynos_gem_obj;
604 int ret;
605
606 /*
607 * allocate memory to be used for framebuffer.
608 * - this callback would be called by user application
609 * with DRM_IOCTL_MODE_CREATE_DUMB command.
610 */
611
612 args->pitch = args->width * ((args->bpp + 7) / 8);
613 args->size = args->pitch * args->height;
614
615 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG |
616 EXYNOS_BO_WC, args->size);
617 /*
618 * If physically contiguous memory allocation fails and if IOMMU is
619 * supported then try to get buffer from non physically contiguous
620 * memory area.
621 */
622 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
623 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
624 exynos_gem_obj = exynos_drm_gem_create(dev,
625 EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
626 args->size);
627 }
628
629 if (IS_ERR(exynos_gem_obj))
630 return PTR_ERR(exynos_gem_obj);
631
632 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
633 &args->handle);
634 if (ret) {
635 exynos_drm_gem_destroy(exynos_gem_obj);
636 return ret;
637 }
638
639 return 0;
640}
641
642int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
643 struct drm_device *dev, uint32_t handle,
644 uint64_t *offset)
645{
646 struct drm_gem_object *obj;
647 int ret = 0;
648
649 mutex_lock(&dev->struct_mutex);
650
651 /*
652 * get offset of memory allocated for drm framebuffer.
653 * - this callback would be called by user application
654 * with DRM_IOCTL_MODE_MAP_DUMB command.
655 */
656
657 obj = drm_gem_object_lookup(dev, file_priv, handle);
658 if (!obj) {
659 DRM_ERROR("failed to lookup gem object.\n");
660 ret = -EINVAL;
661 goto unlock;
662 }
663
664 ret = drm_gem_create_mmap_offset(obj);
665 if (ret)
666 goto out;
667
668 *offset = drm_vma_node_offset_addr(&obj->vma_node);
669 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
670
671out:
672 drm_gem_object_unreference(obj);
673unlock:
674 mutex_unlock(&dev->struct_mutex);
675 return ret;
676}
677
678int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
679{
680 struct drm_gem_object *obj = vma->vm_private_data;
681 struct drm_device *dev = obj->dev;
682 unsigned long f_vaddr;
683 pgoff_t page_offset;
684 int ret;
685
686 page_offset = ((unsigned long)vmf->virtual_address -
687 vma->vm_start) >> PAGE_SHIFT;
688 f_vaddr = (unsigned long)vmf->virtual_address;
689
690 mutex_lock(&dev->struct_mutex);
691
692 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
693 if (ret < 0)
694 DRM_ERROR("failed to map a buffer with user.\n");
695
696 mutex_unlock(&dev->struct_mutex);
697
698 return convert_to_vm_err_msg(ret);
699}
700
701int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
702{
703 struct exynos_drm_gem_obj *exynos_gem_obj;
704 struct drm_gem_object *obj;
705 int ret;
706
707 /* set vm_area_struct. */
708 ret = drm_gem_mmap(filp, vma);
709 if (ret < 0) {
710 DRM_ERROR("failed to mmap.\n");
711 return ret;
712 }
713
714 obj = vma->vm_private_data;
715 exynos_gem_obj = to_exynos_gem_obj(obj);
716
717 ret = check_gem_flags(exynos_gem_obj->flags);
718 if (ret) {
719 drm_gem_vm_close(vma);
720 drm_gem_free_mmap_offset(obj);
721 return ret;
722 }
723
724 vma->vm_flags &= ~VM_PFNMAP;
725 vma->vm_flags |= VM_MIXEDMAP;
726
727 update_vm_cache_attr(exynos_gem_obj, vma);
728
729 return ret;
730}