3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
28 #include <linux/shmem_fs.h>
29 #include <drm/exynos_drm.h>
31 #include "exynos_drm_drv.h"
32 #include "exynos_drm_gem.h"
33 #include "exynos_drm_buf.h"
35 static unsigned int convert_to_vm_err_msg(int msg)
43 out_msg = VM_FAULT_NOPAGE;
47 out_msg = VM_FAULT_OOM;
51 out_msg = VM_FAULT_SIGBUS;
58 static int check_gem_flags(unsigned int flags)
60 if (flags & ~(EXYNOS_BO_MASK)) {
61 DRM_ERROR("invalid flags.\n");
68 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
69 struct vm_area_struct *vma)
71 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
73 /* non-cachable as default. */
74 if (obj->flags & EXYNOS_BO_CACHABLE)
75 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
76 else if (obj->flags & EXYNOS_BO_WC)
78 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
81 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
84 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
88 return roundup(size, PAGE_SIZE);
91 static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
92 struct vm_area_struct *vma,
93 unsigned long f_vaddr,
96 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
97 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
100 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
104 pfn = page_to_pfn(buf->pages[page_offset++]);
106 pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
108 return vm_insert_mixed(vma, f_vaddr, pfn);
111 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
112 struct drm_file *file_priv,
113 unsigned int *handle)
118 * allocate a id of idr table where the obj is registered
119 * and handle has the id what user can see.
121 ret = drm_gem_handle_create(file_priv, obj, handle);
125 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
127 /* drop reference from allocate - handle holds it now. */
128 drm_gem_object_unreference_unlocked(obj);
133 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
135 struct drm_gem_object *obj;
136 struct exynos_drm_gem_buf *buf;
138 DRM_DEBUG_KMS("%s\n", __FILE__);
140 obj = &exynos_gem_obj->base;
141 buf = exynos_gem_obj->buffer;
143 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
146 * do not release memory region from exporter.
148 * the region will be released by exporter
149 * once dmabuf's refcount becomes 0.
151 if (obj->import_attach)
154 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
157 exynos_drm_fini_buf(obj->dev, buf);
158 exynos_gem_obj->buffer = NULL;
160 if (obj->map_list.map)
161 drm_gem_free_mmap_offset(obj);
163 /* release file pointer to gem object. */
164 drm_gem_object_release(obj);
166 kfree(exynos_gem_obj);
167 exynos_gem_obj = NULL;
170 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
173 struct exynos_drm_gem_obj *exynos_gem_obj;
174 struct drm_gem_object *obj;
177 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
178 if (!exynos_gem_obj) {
179 DRM_ERROR("failed to allocate exynos gem object\n");
183 exynos_gem_obj->size = size;
184 obj = &exynos_gem_obj->base;
186 ret = drm_gem_object_init(dev, obj, size);
188 DRM_ERROR("failed to initialize gem object\n");
189 kfree(exynos_gem_obj);
193 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
195 return exynos_gem_obj;
198 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
202 struct exynos_drm_gem_obj *exynos_gem_obj;
203 struct exynos_drm_gem_buf *buf;
207 DRM_ERROR("invalid size.\n");
208 return ERR_PTR(-EINVAL);
211 size = roundup_gem_size(size, flags);
212 DRM_DEBUG_KMS("%s\n", __FILE__);
214 ret = check_gem_flags(flags);
218 buf = exynos_drm_init_buf(dev, size);
220 return ERR_PTR(-ENOMEM);
222 exynos_gem_obj = exynos_drm_gem_init(dev, size);
223 if (!exynos_gem_obj) {
228 exynos_gem_obj->buffer = buf;
230 /* set memory type and cache attribute from user side. */
231 exynos_gem_obj->flags = flags;
233 ret = exynos_drm_alloc_buf(dev, buf, flags);
235 drm_gem_object_release(&exynos_gem_obj->base);
239 return exynos_gem_obj;
242 exynos_drm_fini_buf(dev, buf);
246 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
247 struct drm_file *file_priv)
249 struct drm_exynos_gem_create *args = data;
250 struct exynos_drm_gem_obj *exynos_gem_obj;
253 DRM_DEBUG_KMS("%s\n", __FILE__);
255 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
256 if (IS_ERR(exynos_gem_obj))
257 return PTR_ERR(exynos_gem_obj);
259 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
262 exynos_drm_gem_destroy(exynos_gem_obj);
269 void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
270 unsigned int gem_handle,
271 struct drm_file *file_priv)
273 struct exynos_drm_gem_obj *exynos_gem_obj;
274 struct drm_gem_object *obj;
276 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
278 DRM_ERROR("failed to lookup gem object.\n");
279 return ERR_PTR(-EINVAL);
282 exynos_gem_obj = to_exynos_gem_obj(obj);
284 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
285 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
286 drm_gem_object_unreference_unlocked(obj);
289 return ERR_PTR(-EINVAL);
292 return &exynos_gem_obj->buffer->dma_addr;
295 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
296 unsigned int gem_handle,
297 struct drm_file *file_priv)
299 struct exynos_drm_gem_obj *exynos_gem_obj;
300 struct drm_gem_object *obj;
302 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
304 DRM_ERROR("failed to lookup gem object.\n");
308 exynos_gem_obj = to_exynos_gem_obj(obj);
310 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
311 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
312 drm_gem_object_unreference_unlocked(obj);
318 drm_gem_object_unreference_unlocked(obj);
321 * decrease obj->refcount one more time because we has already
322 * increased it at exynos_drm_gem_get_dma_addr().
324 drm_gem_object_unreference_unlocked(obj);
327 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
328 struct drm_file *file_priv)
330 struct drm_exynos_gem_map_off *args = data;
332 DRM_DEBUG_KMS("%s\n", __FILE__);
334 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
335 args->handle, (unsigned long)args->offset);
337 if (!(dev->driver->driver_features & DRIVER_GEM)) {
338 DRM_ERROR("does not support GEM.\n");
342 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
346 static int exynos_drm_gem_mmap_buffer(struct file *filp,
347 struct vm_area_struct *vma)
349 struct drm_gem_object *obj = filp->private_data;
350 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
351 struct exynos_drm_gem_buf *buffer;
352 unsigned long vm_size;
354 DRM_DEBUG_KMS("%s\n", __FILE__);
356 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
358 update_vm_cache_attr(exynos_gem_obj, vma);
360 vm_size = vma->vm_end - vma->vm_start;
363 * a buffer contains information to physically continuous memory
364 * allocated by user request or at framebuffer creation.
366 buffer = exynos_gem_obj->buffer;
368 /* check if user-requested size is valid. */
369 if (vm_size > buffer->size)
372 return dma_mmap_attrs(obj->dev->dev, vma, buffer->kvaddr,
373 buffer->dma_addr, buffer->size,
377 static const struct file_operations exynos_drm_gem_fops = {
378 .mmap = exynos_drm_gem_mmap_buffer,
381 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
382 struct drm_file *file_priv)
384 struct drm_exynos_gem_mmap *args = data;
385 struct drm_gem_object *obj;
388 DRM_DEBUG_KMS("%s\n", __FILE__);
390 if (!(dev->driver->driver_features & DRIVER_GEM)) {
391 DRM_ERROR("does not support GEM.\n");
395 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
397 DRM_ERROR("failed to lookup gem object.\n");
401 obj->filp->f_op = &exynos_drm_gem_fops;
402 obj->filp->private_data = obj;
404 addr = vm_mmap(obj->filp, 0, args->size,
405 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
407 drm_gem_object_unreference_unlocked(obj);
409 if (IS_ERR((void *)addr))
410 return PTR_ERR((void *)addr);
414 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
419 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
420 struct drm_file *file_priv)
421 { struct exynos_drm_gem_obj *exynos_gem_obj;
422 struct drm_exynos_gem_info *args = data;
423 struct drm_gem_object *obj;
425 mutex_lock(&dev->struct_mutex);
427 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
429 DRM_ERROR("failed to lookup gem object.\n");
430 mutex_unlock(&dev->struct_mutex);
434 exynos_gem_obj = to_exynos_gem_obj(obj);
436 args->flags = exynos_gem_obj->flags;
437 args->size = exynos_gem_obj->size;
439 drm_gem_object_unreference(obj);
440 mutex_unlock(&dev->struct_mutex);
445 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
447 DRM_DEBUG_KMS("%s\n", __FILE__);
452 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
454 struct exynos_drm_gem_obj *exynos_gem_obj;
455 struct exynos_drm_gem_buf *buf;
457 DRM_DEBUG_KMS("%s\n", __FILE__);
459 exynos_gem_obj = to_exynos_gem_obj(obj);
460 buf = exynos_gem_obj->buffer;
462 if (obj->import_attach)
463 drm_prime_gem_destroy(obj, buf->sgt);
465 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
468 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
469 struct drm_device *dev,
470 struct drm_mode_create_dumb *args)
472 struct exynos_drm_gem_obj *exynos_gem_obj;
475 DRM_DEBUG_KMS("%s\n", __FILE__);
478 * alocate memory to be used for framebuffer.
479 * - this callback would be called by user application
480 * with DRM_IOCTL_MODE_CREATE_DUMB command.
483 args->pitch = args->width * ((args->bpp + 7) / 8);
484 args->size = args->pitch * args->height;
486 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
487 if (IS_ERR(exynos_gem_obj))
488 return PTR_ERR(exynos_gem_obj);
490 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
493 exynos_drm_gem_destroy(exynos_gem_obj);
500 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
501 struct drm_device *dev, uint32_t handle,
504 struct drm_gem_object *obj;
507 DRM_DEBUG_KMS("%s\n", __FILE__);
509 mutex_lock(&dev->struct_mutex);
512 * get offset of memory allocated for drm framebuffer.
513 * - this callback would be called by user application
514 * with DRM_IOCTL_MODE_MAP_DUMB command.
517 obj = drm_gem_object_lookup(dev, file_priv, handle);
519 DRM_ERROR("failed to lookup gem object.\n");
524 if (!obj->map_list.map) {
525 ret = drm_gem_create_mmap_offset(obj);
530 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
531 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
534 drm_gem_object_unreference(obj);
536 mutex_unlock(&dev->struct_mutex);
540 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
541 struct drm_device *dev,
546 DRM_DEBUG_KMS("%s\n", __FILE__);
549 * obj->refcount and obj->handle_count are decreased and
550 * if both them are 0 then exynos_drm_gem_free_object()
551 * would be called by callback to release resources.
553 ret = drm_gem_handle_delete(file_priv, handle);
555 DRM_ERROR("failed to delete drm_gem_handle.\n");
562 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
564 struct drm_gem_object *obj = vma->vm_private_data;
565 struct drm_device *dev = obj->dev;
566 unsigned long f_vaddr;
570 page_offset = ((unsigned long)vmf->virtual_address -
571 vma->vm_start) >> PAGE_SHIFT;
572 f_vaddr = (unsigned long)vmf->virtual_address;
574 mutex_lock(&dev->struct_mutex);
576 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
578 DRM_ERROR("failed to map a buffer with user.\n");
580 mutex_unlock(&dev->struct_mutex);
582 return convert_to_vm_err_msg(ret);
585 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
587 struct exynos_drm_gem_obj *exynos_gem_obj;
588 struct drm_gem_object *obj;
591 DRM_DEBUG_KMS("%s\n", __FILE__);
593 /* set vm_area_struct. */
594 ret = drm_gem_mmap(filp, vma);
596 DRM_ERROR("failed to mmap.\n");
600 obj = vma->vm_private_data;
601 exynos_gem_obj = to_exynos_gem_obj(obj);
603 ret = check_gem_flags(exynos_gem_obj->flags);
605 drm_gem_vm_close(vma);
606 drm_gem_free_mmap_offset(obj);
610 vma->vm_flags &= ~VM_PFNMAP;
611 vma->vm_flags |= VM_MIXEDMAP;
613 update_vm_cache_attr(exynos_gem_obj, vma);