3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
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.
14 #include <linux/shmem_fs.h>
15 #include <drm/exynos_drm.h>
17 #include "exynos_drm_drv.h"
18 #include "exynos_drm_gem.h"
19 #include "exynos_drm_buf.h"
21 static unsigned int convert_to_vm_err_msg(int msg)
29 out_msg = VM_FAULT_NOPAGE;
33 out_msg = VM_FAULT_OOM;
37 out_msg = VM_FAULT_SIGBUS;
44 static int check_gem_flags(unsigned int flags)
46 if (flags & ~(EXYNOS_BO_MASK)) {
47 DRM_ERROR("invalid flags.\n");
54 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
55 struct vm_area_struct *vma)
57 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
59 /* non-cachable as default. */
60 if (obj->flags & EXYNOS_BO_CACHABLE)
61 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
62 else if (obj->flags & EXYNOS_BO_WC)
64 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
67 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
70 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
74 return roundup(size, PAGE_SIZE);
77 static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
78 struct vm_area_struct *vma,
79 unsigned long f_vaddr,
82 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
83 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
84 struct scatterlist *sgl;
91 if (page_offset >= (buf->size >> PAGE_SHIFT)) {
92 DRM_ERROR("invalid page offset\n");
97 for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
98 if (page_offset < (sgl->length >> PAGE_SHIFT))
100 page_offset -= (sgl->length >> PAGE_SHIFT);
103 pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
105 return vm_insert_mixed(vma, f_vaddr, pfn);
108 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
109 struct drm_file *file_priv,
110 unsigned int *handle)
115 * allocate a id of idr table where the obj is registered
116 * and handle has the id what user can see.
118 ret = drm_gem_handle_create(file_priv, obj, handle);
122 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
124 /* drop reference from allocate - handle holds it now. */
125 drm_gem_object_unreference_unlocked(obj);
130 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
132 struct drm_gem_object *obj;
133 struct exynos_drm_gem_buf *buf;
135 DRM_DEBUG_KMS("%s\n", __FILE__);
137 obj = &exynos_gem_obj->base;
138 buf = exynos_gem_obj->buffer;
140 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
143 * do not release memory region from exporter.
145 * the region will be released by exporter
146 * once dmabuf's refcount becomes 0.
148 if (obj->import_attach)
151 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
154 exynos_drm_fini_buf(obj->dev, buf);
155 exynos_gem_obj->buffer = NULL;
157 if (obj->map_list.map)
158 drm_gem_free_mmap_offset(obj);
160 /* release file pointer to gem object. */
161 drm_gem_object_release(obj);
163 kfree(exynos_gem_obj);
164 exynos_gem_obj = NULL;
167 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
168 unsigned int gem_handle,
169 struct drm_file *file_priv)
171 struct exynos_drm_gem_obj *exynos_gem_obj;
172 struct drm_gem_object *obj;
174 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
176 DRM_ERROR("failed to lookup gem object.\n");
180 exynos_gem_obj = to_exynos_gem_obj(obj);
182 drm_gem_object_unreference_unlocked(obj);
184 return exynos_gem_obj->buffer->size;
188 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
191 struct exynos_drm_gem_obj *exynos_gem_obj;
192 struct drm_gem_object *obj;
195 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
196 if (!exynos_gem_obj) {
197 DRM_ERROR("failed to allocate exynos gem object\n");
201 exynos_gem_obj->size = size;
202 obj = &exynos_gem_obj->base;
204 ret = drm_gem_object_init(dev, obj, size);
206 DRM_ERROR("failed to initialize gem object\n");
207 kfree(exynos_gem_obj);
211 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
213 return exynos_gem_obj;
216 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
220 struct exynos_drm_gem_obj *exynos_gem_obj;
221 struct exynos_drm_gem_buf *buf;
225 DRM_ERROR("invalid size.\n");
226 return ERR_PTR(-EINVAL);
229 size = roundup_gem_size(size, flags);
230 DRM_DEBUG_KMS("%s\n", __FILE__);
232 ret = check_gem_flags(flags);
236 buf = exynos_drm_init_buf(dev, size);
238 return ERR_PTR(-ENOMEM);
240 exynos_gem_obj = exynos_drm_gem_init(dev, size);
241 if (!exynos_gem_obj) {
246 exynos_gem_obj->buffer = buf;
248 /* set memory type and cache attribute from user side. */
249 exynos_gem_obj->flags = flags;
251 ret = exynos_drm_alloc_buf(dev, buf, flags);
253 drm_gem_object_release(&exynos_gem_obj->base);
257 return exynos_gem_obj;
260 exynos_drm_fini_buf(dev, buf);
264 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
265 struct drm_file *file_priv)
267 struct drm_exynos_gem_create *args = data;
268 struct exynos_drm_gem_obj *exynos_gem_obj;
271 DRM_DEBUG_KMS("%s\n", __FILE__);
273 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
274 if (IS_ERR(exynos_gem_obj))
275 return PTR_ERR(exynos_gem_obj);
277 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
280 exynos_drm_gem_destroy(exynos_gem_obj);
287 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
288 unsigned int gem_handle,
289 struct drm_file *filp)
291 struct exynos_drm_gem_obj *exynos_gem_obj;
292 struct drm_gem_object *obj;
294 obj = drm_gem_object_lookup(dev, filp, gem_handle);
296 DRM_ERROR("failed to lookup gem object.\n");
297 return ERR_PTR(-EINVAL);
300 exynos_gem_obj = to_exynos_gem_obj(obj);
302 return &exynos_gem_obj->buffer->dma_addr;
305 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
306 unsigned int gem_handle,
307 struct drm_file *filp)
309 struct exynos_drm_gem_obj *exynos_gem_obj;
310 struct drm_gem_object *obj;
312 obj = drm_gem_object_lookup(dev, filp, gem_handle);
314 DRM_ERROR("failed to lookup gem object.\n");
318 exynos_gem_obj = to_exynos_gem_obj(obj);
320 drm_gem_object_unreference_unlocked(obj);
323 * decrease obj->refcount one more time because we has already
324 * increased it at exynos_drm_gem_get_dma_addr().
326 drm_gem_object_unreference_unlocked(obj);
329 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
330 struct drm_file *file_priv)
332 struct drm_exynos_gem_map_off *args = data;
334 DRM_DEBUG_KMS("%s\n", __FILE__);
336 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
337 args->handle, (unsigned long)args->offset);
339 if (!(dev->driver->driver_features & DRIVER_GEM)) {
340 DRM_ERROR("does not support GEM.\n");
344 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
348 static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev,
351 struct drm_file *file_priv;
353 /* find current process's drm_file from filelist. */
354 list_for_each_entry(file_priv, &drm_dev->filelist, lhead)
355 if (file_priv->filp == filp)
360 return ERR_PTR(-EFAULT);
363 static int exynos_drm_gem_mmap_buffer(struct file *filp,
364 struct vm_area_struct *vma)
366 struct drm_gem_object *obj = filp->private_data;
367 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
368 struct drm_device *drm_dev = obj->dev;
369 struct exynos_drm_gem_buf *buffer;
370 struct drm_file *file_priv;
371 unsigned long vm_size;
374 DRM_DEBUG_KMS("%s\n", __FILE__);
376 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
377 vma->vm_private_data = obj;
378 vma->vm_ops = drm_dev->driver->gem_vm_ops;
380 /* restore it to driver's fops. */
381 filp->f_op = fops_get(drm_dev->driver->fops);
383 file_priv = exynos_drm_find_drm_file(drm_dev, filp);
384 if (IS_ERR(file_priv))
385 return PTR_ERR(file_priv);
387 /* restore it to drm_file. */
388 filp->private_data = file_priv;
390 update_vm_cache_attr(exynos_gem_obj, vma);
392 vm_size = vma->vm_end - vma->vm_start;
395 * a buffer contains information to physically continuous memory
396 * allocated by user request or at framebuffer creation.
398 buffer = exynos_gem_obj->buffer;
400 /* check if user-requested size is valid. */
401 if (vm_size > buffer->size)
404 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
405 buffer->dma_addr, buffer->size,
408 DRM_ERROR("failed to mmap.\n");
413 * take a reference to this mapping of the object. And this reference
414 * is unreferenced by the corresponding vm_close call.
416 drm_gem_object_reference(obj);
418 drm_vm_open_locked(drm_dev, vma);
423 static const struct file_operations exynos_drm_gem_fops = {
424 .mmap = exynos_drm_gem_mmap_buffer,
427 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
428 struct drm_file *file_priv)
430 struct drm_exynos_gem_mmap *args = data;
431 struct drm_gem_object *obj;
434 DRM_DEBUG_KMS("%s\n", __FILE__);
436 if (!(dev->driver->driver_features & DRIVER_GEM)) {
437 DRM_ERROR("does not support GEM.\n");
441 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
443 DRM_ERROR("failed to lookup gem object.\n");
448 * We have to use gem object and its fops for specific mmaper,
449 * but vm_mmap() can deliver only filp. So we have to change
450 * filp->f_op and filp->private_data temporarily, then restore
451 * again. So it is important to keep lock until restoration the
452 * settings to prevent others from misuse of filp->f_op or
453 * filp->private_data.
455 mutex_lock(&dev->struct_mutex);
458 * Set specific mmper's fops. And it will be restored by
459 * exynos_drm_gem_mmap_buffer to dev->driver->fops.
460 * This is used to call specific mapper temporarily.
462 file_priv->filp->f_op = &exynos_drm_gem_fops;
465 * Set gem object to private_data so that specific mmaper
466 * can get the gem object. And it will be restored by
467 * exynos_drm_gem_mmap_buffer to drm_file.
469 file_priv->filp->private_data = obj;
471 addr = vm_mmap(file_priv->filp, 0, args->size,
472 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
474 drm_gem_object_unreference(obj);
476 if (IS_ERR((void *)addr)) {
477 /* check filp->f_op, filp->private_data are restored */
478 if (file_priv->filp->f_op == &exynos_drm_gem_fops) {
479 file_priv->filp->f_op = fops_get(dev->driver->fops);
480 file_priv->filp->private_data = file_priv;
482 mutex_unlock(&dev->struct_mutex);
483 return PTR_ERR((void *)addr);
486 mutex_unlock(&dev->struct_mutex);
490 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
495 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
496 struct drm_file *file_priv)
497 { struct exynos_drm_gem_obj *exynos_gem_obj;
498 struct drm_exynos_gem_info *args = data;
499 struct drm_gem_object *obj;
501 mutex_lock(&dev->struct_mutex);
503 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
505 DRM_ERROR("failed to lookup gem object.\n");
506 mutex_unlock(&dev->struct_mutex);
510 exynos_gem_obj = to_exynos_gem_obj(obj);
512 args->flags = exynos_gem_obj->flags;
513 args->size = exynos_gem_obj->size;
515 drm_gem_object_unreference(obj);
516 mutex_unlock(&dev->struct_mutex);
521 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
523 struct vm_area_struct *vma_copy;
525 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
529 if (vma->vm_ops && vma->vm_ops->open)
530 vma->vm_ops->open(vma);
533 get_file(vma->vm_file);
535 memcpy(vma_copy, vma, sizeof(*vma));
537 vma_copy->vm_mm = NULL;
538 vma_copy->vm_next = NULL;
539 vma_copy->vm_prev = NULL;
544 void exynos_gem_put_vma(struct vm_area_struct *vma)
549 if (vma->vm_ops && vma->vm_ops->close)
550 vma->vm_ops->close(vma);
558 int exynos_gem_get_pages_from_userptr(unsigned long start,
561 struct vm_area_struct *vma)
565 /* the memory region mmaped with VM_PFNMAP. */
566 if (vma_is_io(vma)) {
569 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
571 int ret = follow_pfn(vma, start, &pfn);
575 pages[i] = pfn_to_page(pfn);
579 DRM_ERROR("failed to get user_pages.\n");
586 get_npages = get_user_pages(current, current->mm, start,
587 npages, 1, 1, pages, NULL);
588 get_npages = max(get_npages, 0);
589 if (get_npages != npages) {
590 DRM_ERROR("failed to get user_pages.\n");
592 put_page(pages[--get_npages]);
599 void exynos_gem_put_pages_to_userptr(struct page **pages,
601 struct vm_area_struct *vma)
603 if (!vma_is_io(vma)) {
606 for (i = 0; i < npages; i++) {
607 set_page_dirty_lock(pages[i]);
610 * undo the reference we took when populating
618 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
619 struct sg_table *sgt,
620 enum dma_data_direction dir)
624 mutex_lock(&drm_dev->struct_mutex);
626 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
628 DRM_ERROR("failed to map sgl with dma.\n");
629 mutex_unlock(&drm_dev->struct_mutex);
633 mutex_unlock(&drm_dev->struct_mutex);
637 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
638 struct sg_table *sgt,
639 enum dma_data_direction dir)
641 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
644 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
646 DRM_DEBUG_KMS("%s\n", __FILE__);
651 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
653 struct exynos_drm_gem_obj *exynos_gem_obj;
654 struct exynos_drm_gem_buf *buf;
656 DRM_DEBUG_KMS("%s\n", __FILE__);
658 exynos_gem_obj = to_exynos_gem_obj(obj);
659 buf = exynos_gem_obj->buffer;
661 if (obj->import_attach)
662 drm_prime_gem_destroy(obj, buf->sgt);
664 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
667 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
668 struct drm_device *dev,
669 struct drm_mode_create_dumb *args)
671 struct exynos_drm_gem_obj *exynos_gem_obj;
674 DRM_DEBUG_KMS("%s\n", __FILE__);
677 * alocate memory to be used for framebuffer.
678 * - this callback would be called by user application
679 * with DRM_IOCTL_MODE_CREATE_DUMB command.
682 args->pitch = args->width * ((args->bpp + 7) / 8);
683 args->size = args->pitch * args->height;
685 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
686 if (IS_ERR(exynos_gem_obj))
687 return PTR_ERR(exynos_gem_obj);
689 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
692 exynos_drm_gem_destroy(exynos_gem_obj);
699 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
700 struct drm_device *dev, uint32_t handle,
703 struct drm_gem_object *obj;
706 DRM_DEBUG_KMS("%s\n", __FILE__);
708 mutex_lock(&dev->struct_mutex);
711 * get offset of memory allocated for drm framebuffer.
712 * - this callback would be called by user application
713 * with DRM_IOCTL_MODE_MAP_DUMB command.
716 obj = drm_gem_object_lookup(dev, file_priv, handle);
718 DRM_ERROR("failed to lookup gem object.\n");
723 if (!obj->map_list.map) {
724 ret = drm_gem_create_mmap_offset(obj);
729 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
730 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
733 drm_gem_object_unreference(obj);
735 mutex_unlock(&dev->struct_mutex);
739 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
740 struct drm_device *dev,
745 DRM_DEBUG_KMS("%s\n", __FILE__);
748 * obj->refcount and obj->handle_count are decreased and
749 * if both them are 0 then exynos_drm_gem_free_object()
750 * would be called by callback to release resources.
752 ret = drm_gem_handle_delete(file_priv, handle);
754 DRM_ERROR("failed to delete drm_gem_handle.\n");
761 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
763 struct drm_gem_object *obj = vma->vm_private_data;
764 struct drm_device *dev = obj->dev;
765 unsigned long f_vaddr;
769 page_offset = ((unsigned long)vmf->virtual_address -
770 vma->vm_start) >> PAGE_SHIFT;
771 f_vaddr = (unsigned long)vmf->virtual_address;
773 mutex_lock(&dev->struct_mutex);
775 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
777 DRM_ERROR("failed to map a buffer with user.\n");
779 mutex_unlock(&dev->struct_mutex);
781 return convert_to_vm_err_msg(ret);
784 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
786 struct exynos_drm_gem_obj *exynos_gem_obj;
787 struct drm_gem_object *obj;
790 DRM_DEBUG_KMS("%s\n", __FILE__);
792 /* set vm_area_struct. */
793 ret = drm_gem_mmap(filp, vma);
795 DRM_ERROR("failed to mmap.\n");
799 obj = vma->vm_private_data;
800 exynos_gem_obj = to_exynos_gem_obj(obj);
802 ret = check_gem_flags(exynos_gem_obj->flags);
804 drm_gem_vm_close(vma);
805 drm_gem_free_mmap_offset(obj);
809 vma->vm_flags &= ~VM_PFNMAP;
810 vma->vm_flags |= VM_MIXEDMAP;
812 update_vm_cache_attr(exynos_gem_obj, vma);