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;
98 struct scatterlist *sgl;
105 if (page_offset >= (buf->size >> PAGE_SHIFT)) {
106 DRM_ERROR("invalid page offset\n");
111 for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
112 if (page_offset < (sgl->length >> PAGE_SHIFT))
114 page_offset -= (sgl->length >> PAGE_SHIFT);
117 pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
119 return vm_insert_mixed(vma, f_vaddr, pfn);
122 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
123 struct drm_file *file_priv,
124 unsigned int *handle)
129 * allocate a id of idr table where the obj is registered
130 * and handle has the id what user can see.
132 ret = drm_gem_handle_create(file_priv, obj, handle);
136 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
138 /* drop reference from allocate - handle holds it now. */
139 drm_gem_object_unreference_unlocked(obj);
144 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
146 struct drm_gem_object *obj;
147 struct exynos_drm_gem_buf *buf;
149 DRM_DEBUG_KMS("%s\n", __FILE__);
151 obj = &exynos_gem_obj->base;
152 buf = exynos_gem_obj->buffer;
154 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
157 * do not release memory region from exporter.
159 * the region will be released by exporter
160 * once dmabuf's refcount becomes 0.
162 if (obj->import_attach)
165 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
168 exynos_drm_fini_buf(obj->dev, buf);
169 exynos_gem_obj->buffer = NULL;
171 if (obj->map_list.map)
172 drm_gem_free_mmap_offset(obj);
174 /* release file pointer to gem object. */
175 drm_gem_object_release(obj);
177 kfree(exynos_gem_obj);
178 exynos_gem_obj = NULL;
181 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
184 struct exynos_drm_gem_obj *exynos_gem_obj;
185 struct drm_gem_object *obj;
188 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
189 if (!exynos_gem_obj) {
190 DRM_ERROR("failed to allocate exynos gem object\n");
194 exynos_gem_obj->size = size;
195 obj = &exynos_gem_obj->base;
197 ret = drm_gem_object_init(dev, obj, size);
199 DRM_ERROR("failed to initialize gem object\n");
200 kfree(exynos_gem_obj);
204 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
206 return exynos_gem_obj;
209 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
213 struct exynos_drm_gem_obj *exynos_gem_obj;
214 struct exynos_drm_gem_buf *buf;
218 DRM_ERROR("invalid size.\n");
219 return ERR_PTR(-EINVAL);
222 size = roundup_gem_size(size, flags);
223 DRM_DEBUG_KMS("%s\n", __FILE__);
225 ret = check_gem_flags(flags);
229 buf = exynos_drm_init_buf(dev, size);
231 return ERR_PTR(-ENOMEM);
233 exynos_gem_obj = exynos_drm_gem_init(dev, size);
234 if (!exynos_gem_obj) {
239 exynos_gem_obj->buffer = buf;
241 /* set memory type and cache attribute from user side. */
242 exynos_gem_obj->flags = flags;
244 ret = exynos_drm_alloc_buf(dev, buf, flags);
246 drm_gem_object_release(&exynos_gem_obj->base);
250 return exynos_gem_obj;
253 exynos_drm_fini_buf(dev, buf);
257 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
258 struct drm_file *file_priv)
260 struct drm_exynos_gem_create *args = data;
261 struct exynos_drm_gem_obj *exynos_gem_obj;
264 DRM_DEBUG_KMS("%s\n", __FILE__);
266 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
267 if (IS_ERR(exynos_gem_obj))
268 return PTR_ERR(exynos_gem_obj);
270 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
273 exynos_drm_gem_destroy(exynos_gem_obj);
280 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
281 unsigned int gem_handle,
282 struct drm_file *filp)
284 struct exynos_drm_gem_obj *exynos_gem_obj;
285 struct drm_gem_object *obj;
287 obj = drm_gem_object_lookup(dev, filp, gem_handle);
289 DRM_ERROR("failed to lookup gem object.\n");
290 return ERR_PTR(-EINVAL);
293 exynos_gem_obj = to_exynos_gem_obj(obj);
295 return &exynos_gem_obj->buffer->dma_addr;
298 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
299 unsigned int gem_handle,
300 struct drm_file *filp)
302 struct exynos_drm_gem_obj *exynos_gem_obj;
303 struct drm_gem_object *obj;
305 obj = drm_gem_object_lookup(dev, filp, gem_handle);
307 DRM_ERROR("failed to lookup gem object.\n");
311 exynos_gem_obj = to_exynos_gem_obj(obj);
313 drm_gem_object_unreference_unlocked(obj);
316 * decrease obj->refcount one more time because we has already
317 * increased it at exynos_drm_gem_get_dma_addr().
319 drm_gem_object_unreference_unlocked(obj);
322 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
323 struct drm_file *file_priv)
325 struct drm_exynos_gem_map_off *args = data;
327 DRM_DEBUG_KMS("%s\n", __FILE__);
329 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
330 args->handle, (unsigned long)args->offset);
332 if (!(dev->driver->driver_features & DRIVER_GEM)) {
333 DRM_ERROR("does not support GEM.\n");
337 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
341 static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev,
344 struct drm_file *file_priv;
346 mutex_lock(&drm_dev->struct_mutex);
348 /* find current process's drm_file from filelist. */
349 list_for_each_entry(file_priv, &drm_dev->filelist, lhead) {
350 if (file_priv->filp == filp) {
351 mutex_unlock(&drm_dev->struct_mutex);
356 mutex_unlock(&drm_dev->struct_mutex);
359 return ERR_PTR(-EFAULT);
362 static int exynos_drm_gem_mmap_buffer(struct file *filp,
363 struct vm_area_struct *vma)
365 struct drm_gem_object *obj = filp->private_data;
366 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
367 struct drm_device *drm_dev = obj->dev;
368 struct exynos_drm_gem_buf *buffer;
369 struct drm_file *file_priv;
370 unsigned long vm_size;
373 DRM_DEBUG_KMS("%s\n", __FILE__);
375 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
376 vma->vm_private_data = obj;
377 vma->vm_ops = drm_dev->driver->gem_vm_ops;
379 /* restore it to driver's fops. */
380 filp->f_op = fops_get(drm_dev->driver->fops);
382 file_priv = exynos_drm_find_drm_file(drm_dev, filp);
383 if (IS_ERR(file_priv))
384 return PTR_ERR(file_priv);
386 /* restore it to drm_file. */
387 filp->private_data = file_priv;
389 update_vm_cache_attr(exynos_gem_obj, vma);
391 vm_size = vma->vm_end - vma->vm_start;
394 * a buffer contains information to physically continuous memory
395 * allocated by user request or at framebuffer creation.
397 buffer = exynos_gem_obj->buffer;
399 /* check if user-requested size is valid. */
400 if (vm_size > buffer->size)
403 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
404 buffer->dma_addr, buffer->size,
407 DRM_ERROR("failed to mmap.\n");
412 * take a reference to this mapping of the object. And this reference
413 * is unreferenced by the corresponding vm_close call.
415 drm_gem_object_reference(obj);
417 mutex_lock(&drm_dev->struct_mutex);
418 drm_vm_open_locked(drm_dev, vma);
419 mutex_unlock(&drm_dev->struct_mutex);
424 static const struct file_operations exynos_drm_gem_fops = {
425 .mmap = exynos_drm_gem_mmap_buffer,
428 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
429 struct drm_file *file_priv)
431 struct drm_exynos_gem_mmap *args = data;
432 struct drm_gem_object *obj;
435 DRM_DEBUG_KMS("%s\n", __FILE__);
437 if (!(dev->driver->driver_features & DRIVER_GEM)) {
438 DRM_ERROR("does not support GEM.\n");
442 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
444 DRM_ERROR("failed to lookup gem object.\n");
449 * Set specific mmper's fops. And it will be restored by
450 * exynos_drm_gem_mmap_buffer to dev->driver->fops.
451 * This is used to call specific mapper temporarily.
453 file_priv->filp->f_op = &exynos_drm_gem_fops;
456 * Set gem object to private_data so that specific mmaper
457 * can get the gem object. And it will be restored by
458 * exynos_drm_gem_mmap_buffer to drm_file.
460 file_priv->filp->private_data = obj;
462 addr = vm_mmap(file_priv->filp, 0, args->size,
463 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
465 drm_gem_object_unreference_unlocked(obj);
467 if (IS_ERR((void *)addr)) {
468 file_priv->filp->private_data = file_priv;
469 return PTR_ERR((void *)addr);
474 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
479 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
480 struct drm_file *file_priv)
481 { struct exynos_drm_gem_obj *exynos_gem_obj;
482 struct drm_exynos_gem_info *args = data;
483 struct drm_gem_object *obj;
485 mutex_lock(&dev->struct_mutex);
487 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
489 DRM_ERROR("failed to lookup gem object.\n");
490 mutex_unlock(&dev->struct_mutex);
494 exynos_gem_obj = to_exynos_gem_obj(obj);
496 args->flags = exynos_gem_obj->flags;
497 args->size = exynos_gem_obj->size;
499 drm_gem_object_unreference(obj);
500 mutex_unlock(&dev->struct_mutex);
505 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
507 struct vm_area_struct *vma_copy;
509 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
513 if (vma->vm_ops && vma->vm_ops->open)
514 vma->vm_ops->open(vma);
517 get_file(vma->vm_file);
519 memcpy(vma_copy, vma, sizeof(*vma));
521 vma_copy->vm_mm = NULL;
522 vma_copy->vm_next = NULL;
523 vma_copy->vm_prev = NULL;
528 void exynos_gem_put_vma(struct vm_area_struct *vma)
533 if (vma->vm_ops && vma->vm_ops->close)
534 vma->vm_ops->close(vma);
542 int exynos_gem_get_pages_from_userptr(unsigned long start,
545 struct vm_area_struct *vma)
549 /* the memory region mmaped with VM_PFNMAP. */
550 if (vma_is_io(vma)) {
553 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
555 int ret = follow_pfn(vma, start, &pfn);
559 pages[i] = pfn_to_page(pfn);
563 DRM_ERROR("failed to get user_pages.\n");
570 get_npages = get_user_pages(current, current->mm, start,
571 npages, 1, 1, pages, NULL);
572 get_npages = max(get_npages, 0);
573 if (get_npages != npages) {
574 DRM_ERROR("failed to get user_pages.\n");
576 put_page(pages[--get_npages]);
583 void exynos_gem_put_pages_to_userptr(struct page **pages,
585 struct vm_area_struct *vma)
587 if (!vma_is_io(vma)) {
590 for (i = 0; i < npages; i++) {
591 set_page_dirty_lock(pages[i]);
594 * undo the reference we took when populating
602 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
603 struct sg_table *sgt,
604 enum dma_data_direction dir)
608 mutex_lock(&drm_dev->struct_mutex);
610 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
612 DRM_ERROR("failed to map sgl with dma.\n");
613 mutex_unlock(&drm_dev->struct_mutex);
617 mutex_unlock(&drm_dev->struct_mutex);
621 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
622 struct sg_table *sgt,
623 enum dma_data_direction dir)
625 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
628 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
630 DRM_DEBUG_KMS("%s\n", __FILE__);
635 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
637 struct exynos_drm_gem_obj *exynos_gem_obj;
638 struct exynos_drm_gem_buf *buf;
640 DRM_DEBUG_KMS("%s\n", __FILE__);
642 exynos_gem_obj = to_exynos_gem_obj(obj);
643 buf = exynos_gem_obj->buffer;
645 if (obj->import_attach)
646 drm_prime_gem_destroy(obj, buf->sgt);
648 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
651 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
652 struct drm_device *dev,
653 struct drm_mode_create_dumb *args)
655 struct exynos_drm_gem_obj *exynos_gem_obj;
658 DRM_DEBUG_KMS("%s\n", __FILE__);
661 * alocate memory to be used for framebuffer.
662 * - this callback would be called by user application
663 * with DRM_IOCTL_MODE_CREATE_DUMB command.
666 args->pitch = args->width * ((args->bpp + 7) / 8);
667 args->size = args->pitch * args->height;
669 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
670 if (IS_ERR(exynos_gem_obj))
671 return PTR_ERR(exynos_gem_obj);
673 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
676 exynos_drm_gem_destroy(exynos_gem_obj);
683 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
684 struct drm_device *dev, uint32_t handle,
687 struct drm_gem_object *obj;
690 DRM_DEBUG_KMS("%s\n", __FILE__);
692 mutex_lock(&dev->struct_mutex);
695 * get offset of memory allocated for drm framebuffer.
696 * - this callback would be called by user application
697 * with DRM_IOCTL_MODE_MAP_DUMB command.
700 obj = drm_gem_object_lookup(dev, file_priv, handle);
702 DRM_ERROR("failed to lookup gem object.\n");
707 if (!obj->map_list.map) {
708 ret = drm_gem_create_mmap_offset(obj);
713 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
714 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
717 drm_gem_object_unreference(obj);
719 mutex_unlock(&dev->struct_mutex);
723 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
724 struct drm_device *dev,
729 DRM_DEBUG_KMS("%s\n", __FILE__);
732 * obj->refcount and obj->handle_count are decreased and
733 * if both them are 0 then exynos_drm_gem_free_object()
734 * would be called by callback to release resources.
736 ret = drm_gem_handle_delete(file_priv, handle);
738 DRM_ERROR("failed to delete drm_gem_handle.\n");
745 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
747 struct drm_gem_object *obj = vma->vm_private_data;
748 struct drm_device *dev = obj->dev;
749 unsigned long f_vaddr;
753 page_offset = ((unsigned long)vmf->virtual_address -
754 vma->vm_start) >> PAGE_SHIFT;
755 f_vaddr = (unsigned long)vmf->virtual_address;
757 mutex_lock(&dev->struct_mutex);
759 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
761 DRM_ERROR("failed to map a buffer with user.\n");
763 mutex_unlock(&dev->struct_mutex);
765 return convert_to_vm_err_msg(ret);
768 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
770 struct exynos_drm_gem_obj *exynos_gem_obj;
771 struct drm_gem_object *obj;
774 DRM_DEBUG_KMS("%s\n", __FILE__);
776 /* set vm_area_struct. */
777 ret = drm_gem_mmap(filp, vma);
779 DRM_ERROR("failed to mmap.\n");
783 obj = vma->vm_private_data;
784 exynos_gem_obj = to_exynos_gem_obj(obj);
786 ret = check_gem_flags(exynos_gem_obj->flags);
788 drm_gem_vm_close(vma);
789 drm_gem_free_mmap_offset(obj);
793 vma->vm_flags &= ~VM_PFNMAP;
794 vma->vm_flags |= VM_MIXEDMAP;
796 update_vm_cache_attr(exynos_gem_obj, vma);