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 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
170 struct exynos_drm_gem_obj *exynos_gem_obj;
171 struct drm_gem_object *obj;
174 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
175 if (!exynos_gem_obj) {
176 DRM_ERROR("failed to allocate exynos gem object\n");
180 exynos_gem_obj->size = size;
181 obj = &exynos_gem_obj->base;
183 ret = drm_gem_object_init(dev, obj, size);
185 DRM_ERROR("failed to initialize gem object\n");
186 kfree(exynos_gem_obj);
190 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
192 return exynos_gem_obj;
195 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
199 struct exynos_drm_gem_obj *exynos_gem_obj;
200 struct exynos_drm_gem_buf *buf;
204 DRM_ERROR("invalid size.\n");
205 return ERR_PTR(-EINVAL);
208 size = roundup_gem_size(size, flags);
209 DRM_DEBUG_KMS("%s\n", __FILE__);
211 ret = check_gem_flags(flags);
215 buf = exynos_drm_init_buf(dev, size);
217 return ERR_PTR(-ENOMEM);
219 exynos_gem_obj = exynos_drm_gem_init(dev, size);
220 if (!exynos_gem_obj) {
225 exynos_gem_obj->buffer = buf;
227 /* set memory type and cache attribute from user side. */
228 exynos_gem_obj->flags = flags;
230 ret = exynos_drm_alloc_buf(dev, buf, flags);
232 drm_gem_object_release(&exynos_gem_obj->base);
236 return exynos_gem_obj;
239 exynos_drm_fini_buf(dev, buf);
243 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
244 struct drm_file *file_priv)
246 struct drm_exynos_gem_create *args = data;
247 struct exynos_drm_gem_obj *exynos_gem_obj;
250 DRM_DEBUG_KMS("%s\n", __FILE__);
252 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
253 if (IS_ERR(exynos_gem_obj))
254 return PTR_ERR(exynos_gem_obj);
256 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
259 exynos_drm_gem_destroy(exynos_gem_obj);
266 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
267 unsigned int gem_handle,
268 struct drm_file *filp)
270 struct exynos_drm_gem_obj *exynos_gem_obj;
271 struct drm_gem_object *obj;
273 obj = drm_gem_object_lookup(dev, filp, gem_handle);
275 DRM_ERROR("failed to lookup gem object.\n");
276 return ERR_PTR(-EINVAL);
279 exynos_gem_obj = to_exynos_gem_obj(obj);
281 return &exynos_gem_obj->buffer->dma_addr;
284 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
285 unsigned int gem_handle,
286 struct drm_file *filp)
288 struct exynos_drm_gem_obj *exynos_gem_obj;
289 struct drm_gem_object *obj;
291 obj = drm_gem_object_lookup(dev, filp, gem_handle);
293 DRM_ERROR("failed to lookup gem object.\n");
297 exynos_gem_obj = to_exynos_gem_obj(obj);
299 drm_gem_object_unreference_unlocked(obj);
302 * decrease obj->refcount one more time because we has already
303 * increased it at exynos_drm_gem_get_dma_addr().
305 drm_gem_object_unreference_unlocked(obj);
308 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
309 struct drm_file *file_priv)
311 struct drm_exynos_gem_map_off *args = data;
313 DRM_DEBUG_KMS("%s\n", __FILE__);
315 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
316 args->handle, (unsigned long)args->offset);
318 if (!(dev->driver->driver_features & DRIVER_GEM)) {
319 DRM_ERROR("does not support GEM.\n");
323 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
327 static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev,
330 struct drm_file *file_priv;
332 mutex_lock(&drm_dev->struct_mutex);
334 /* find current process's drm_file from filelist. */
335 list_for_each_entry(file_priv, &drm_dev->filelist, lhead) {
336 if (file_priv->filp == filp) {
337 mutex_unlock(&drm_dev->struct_mutex);
342 mutex_unlock(&drm_dev->struct_mutex);
345 return ERR_PTR(-EFAULT);
348 static int exynos_drm_gem_mmap_buffer(struct file *filp,
349 struct vm_area_struct *vma)
351 struct drm_gem_object *obj = filp->private_data;
352 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
353 struct drm_device *drm_dev = obj->dev;
354 struct exynos_drm_gem_buf *buffer;
355 struct drm_file *file_priv;
356 unsigned long vm_size;
359 DRM_DEBUG_KMS("%s\n", __FILE__);
361 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
362 vma->vm_private_data = obj;
363 vma->vm_ops = drm_dev->driver->gem_vm_ops;
365 /* restore it to driver's fops. */
366 filp->f_op = fops_get(drm_dev->driver->fops);
368 file_priv = exynos_drm_find_drm_file(drm_dev, filp);
369 if (IS_ERR(file_priv))
370 return PTR_ERR(file_priv);
372 /* restore it to drm_file. */
373 filp->private_data = file_priv;
375 update_vm_cache_attr(exynos_gem_obj, vma);
377 vm_size = vma->vm_end - vma->vm_start;
380 * a buffer contains information to physically continuous memory
381 * allocated by user request or at framebuffer creation.
383 buffer = exynos_gem_obj->buffer;
385 /* check if user-requested size is valid. */
386 if (vm_size > buffer->size)
389 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
390 buffer->dma_addr, buffer->size,
393 DRM_ERROR("failed to mmap.\n");
398 * take a reference to this mapping of the object. And this reference
399 * is unreferenced by the corresponding vm_close call.
401 drm_gem_object_reference(obj);
403 mutex_lock(&drm_dev->struct_mutex);
404 drm_vm_open_locked(drm_dev, vma);
405 mutex_unlock(&drm_dev->struct_mutex);
410 static const struct file_operations exynos_drm_gem_fops = {
411 .mmap = exynos_drm_gem_mmap_buffer,
414 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
415 struct drm_file *file_priv)
417 struct drm_exynos_gem_mmap *args = data;
418 struct drm_gem_object *obj;
421 DRM_DEBUG_KMS("%s\n", __FILE__);
423 if (!(dev->driver->driver_features & DRIVER_GEM)) {
424 DRM_ERROR("does not support GEM.\n");
428 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
430 DRM_ERROR("failed to lookup gem object.\n");
435 * Set specific mmper's fops. And it will be restored by
436 * exynos_drm_gem_mmap_buffer to dev->driver->fops.
437 * This is used to call specific mapper temporarily.
439 file_priv->filp->f_op = &exynos_drm_gem_fops;
442 * Set gem object to private_data so that specific mmaper
443 * can get the gem object. And it will be restored by
444 * exynos_drm_gem_mmap_buffer to drm_file.
446 file_priv->filp->private_data = obj;
448 addr = vm_mmap(file_priv->filp, 0, args->size,
449 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
451 drm_gem_object_unreference_unlocked(obj);
453 if (IS_ERR((void *)addr)) {
454 file_priv->filp->private_data = file_priv;
455 return PTR_ERR((void *)addr);
460 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
465 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
466 struct drm_file *file_priv)
467 { struct exynos_drm_gem_obj *exynos_gem_obj;
468 struct drm_exynos_gem_info *args = data;
469 struct drm_gem_object *obj;
471 mutex_lock(&dev->struct_mutex);
473 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
475 DRM_ERROR("failed to lookup gem object.\n");
476 mutex_unlock(&dev->struct_mutex);
480 exynos_gem_obj = to_exynos_gem_obj(obj);
482 args->flags = exynos_gem_obj->flags;
483 args->size = exynos_gem_obj->size;
485 drm_gem_object_unreference(obj);
486 mutex_unlock(&dev->struct_mutex);
491 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
493 struct vm_area_struct *vma_copy;
495 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
499 if (vma->vm_ops && vma->vm_ops->open)
500 vma->vm_ops->open(vma);
503 get_file(vma->vm_file);
505 memcpy(vma_copy, vma, sizeof(*vma));
507 vma_copy->vm_mm = NULL;
508 vma_copy->vm_next = NULL;
509 vma_copy->vm_prev = NULL;
514 void exynos_gem_put_vma(struct vm_area_struct *vma)
519 if (vma->vm_ops && vma->vm_ops->close)
520 vma->vm_ops->close(vma);
528 int exynos_gem_get_pages_from_userptr(unsigned long start,
531 struct vm_area_struct *vma)
535 /* the memory region mmaped with VM_PFNMAP. */
536 if (vma_is_io(vma)) {
539 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
541 int ret = follow_pfn(vma, start, &pfn);
545 pages[i] = pfn_to_page(pfn);
549 DRM_ERROR("failed to get user_pages.\n");
556 get_npages = get_user_pages(current, current->mm, start,
557 npages, 1, 1, pages, NULL);
558 get_npages = max(get_npages, 0);
559 if (get_npages != npages) {
560 DRM_ERROR("failed to get user_pages.\n");
562 put_page(pages[--get_npages]);
569 void exynos_gem_put_pages_to_userptr(struct page **pages,
571 struct vm_area_struct *vma)
573 if (!vma_is_io(vma)) {
576 for (i = 0; i < npages; i++) {
577 set_page_dirty_lock(pages[i]);
580 * undo the reference we took when populating
588 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
589 struct sg_table *sgt,
590 enum dma_data_direction dir)
594 mutex_lock(&drm_dev->struct_mutex);
596 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
598 DRM_ERROR("failed to map sgl with dma.\n");
599 mutex_unlock(&drm_dev->struct_mutex);
603 mutex_unlock(&drm_dev->struct_mutex);
607 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
608 struct sg_table *sgt,
609 enum dma_data_direction dir)
611 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
614 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
616 DRM_DEBUG_KMS("%s\n", __FILE__);
621 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
623 struct exynos_drm_gem_obj *exynos_gem_obj;
624 struct exynos_drm_gem_buf *buf;
626 DRM_DEBUG_KMS("%s\n", __FILE__);
628 exynos_gem_obj = to_exynos_gem_obj(obj);
629 buf = exynos_gem_obj->buffer;
631 if (obj->import_attach)
632 drm_prime_gem_destroy(obj, buf->sgt);
634 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
637 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
638 struct drm_device *dev,
639 struct drm_mode_create_dumb *args)
641 struct exynos_drm_gem_obj *exynos_gem_obj;
644 DRM_DEBUG_KMS("%s\n", __FILE__);
647 * alocate memory to be used for framebuffer.
648 * - this callback would be called by user application
649 * with DRM_IOCTL_MODE_CREATE_DUMB command.
652 args->pitch = args->width * ((args->bpp + 7) / 8);
653 args->size = args->pitch * args->height;
655 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
656 if (IS_ERR(exynos_gem_obj))
657 return PTR_ERR(exynos_gem_obj);
659 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
662 exynos_drm_gem_destroy(exynos_gem_obj);
669 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
670 struct drm_device *dev, uint32_t handle,
673 struct drm_gem_object *obj;
676 DRM_DEBUG_KMS("%s\n", __FILE__);
678 mutex_lock(&dev->struct_mutex);
681 * get offset of memory allocated for drm framebuffer.
682 * - this callback would be called by user application
683 * with DRM_IOCTL_MODE_MAP_DUMB command.
686 obj = drm_gem_object_lookup(dev, file_priv, handle);
688 DRM_ERROR("failed to lookup gem object.\n");
693 if (!obj->map_list.map) {
694 ret = drm_gem_create_mmap_offset(obj);
699 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
700 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
703 drm_gem_object_unreference(obj);
705 mutex_unlock(&dev->struct_mutex);
709 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
710 struct drm_device *dev,
715 DRM_DEBUG_KMS("%s\n", __FILE__);
718 * obj->refcount and obj->handle_count are decreased and
719 * if both them are 0 then exynos_drm_gem_free_object()
720 * would be called by callback to release resources.
722 ret = drm_gem_handle_delete(file_priv, handle);
724 DRM_ERROR("failed to delete drm_gem_handle.\n");
731 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
733 struct drm_gem_object *obj = vma->vm_private_data;
734 struct drm_device *dev = obj->dev;
735 unsigned long f_vaddr;
739 page_offset = ((unsigned long)vmf->virtual_address -
740 vma->vm_start) >> PAGE_SHIFT;
741 f_vaddr = (unsigned long)vmf->virtual_address;
743 mutex_lock(&dev->struct_mutex);
745 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
747 DRM_ERROR("failed to map a buffer with user.\n");
749 mutex_unlock(&dev->struct_mutex);
751 return convert_to_vm_err_msg(ret);
754 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
756 struct exynos_drm_gem_obj *exynos_gem_obj;
757 struct drm_gem_object *obj;
760 DRM_DEBUG_KMS("%s\n", __FILE__);
762 /* set vm_area_struct. */
763 ret = drm_gem_mmap(filp, vma);
765 DRM_ERROR("failed to mmap.\n");
769 obj = vma->vm_private_data;
770 exynos_gem_obj = to_exynos_gem_obj(obj);
772 ret = check_gem_flags(exynos_gem_obj->flags);
774 drm_gem_vm_close(vma);
775 drm_gem_free_mmap_offset(obj);
779 vma->vm_flags &= ~VM_PFNMAP;
780 vma->vm_flags |= VM_MIXEDMAP;
782 update_vm_cache_attr(exynos_gem_obj, vma);