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.
29 #include <linux/shmem_fs.h>
30 #include <drm/exynos_drm.h>
32 #include "exynos_drm_drv.h"
33 #include "exynos_drm_gem.h"
34 #include "exynos_drm_buf.h"
36 static unsigned int convert_to_vm_err_msg(int msg)
44 out_msg = VM_FAULT_NOPAGE;
48 out_msg = VM_FAULT_OOM;
52 out_msg = VM_FAULT_SIGBUS;
59 static int check_gem_flags(unsigned int flags)
61 if (flags & ~(EXYNOS_BO_MASK)) {
62 DRM_ERROR("invalid flags.\n");
69 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
70 struct vm_area_struct *vma)
72 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
74 /* non-cachable as default. */
75 if (obj->flags & EXYNOS_BO_CACHABLE)
76 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
77 else if (obj->flags & EXYNOS_BO_WC)
79 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
82 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
85 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
87 if (!IS_NONCONTIG_BUFFER(flags)) {
89 return roundup(size, SECTION_SIZE);
90 else if (size >= SZ_64K)
91 return roundup(size, SZ_64K);
96 return roundup(size, PAGE_SIZE);
99 static struct page **exynos_gem_get_pages(struct drm_gem_object *obj,
103 struct address_space *mapping;
104 struct page *p, **pages;
107 /* This is the shared memory object that backs the GEM resource */
108 inode = obj->filp->f_path.dentry->d_inode;
109 mapping = inode->i_mapping;
111 npages = obj->size >> PAGE_SHIFT;
113 pages = drm_malloc_ab(npages, sizeof(struct page *));
115 return ERR_PTR(-ENOMEM);
117 gfpmask |= mapping_gfp_mask(mapping);
119 for (i = 0; i < npages; i++) {
120 p = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
130 page_cache_release(pages[i]);
132 drm_free_large(pages);
133 return ERR_PTR(PTR_ERR(p));
136 static void exynos_gem_put_pages(struct drm_gem_object *obj,
138 bool dirty, bool accessed)
142 npages = obj->size >> PAGE_SHIFT;
144 for (i = 0; i < npages; i++) {
146 set_page_dirty(pages[i]);
149 mark_page_accessed(pages[i]);
151 /* Undo the reference we took when populating the table */
152 page_cache_release(pages[i]);
155 drm_free_large(pages);
158 static int exynos_drm_gem_map_pages(struct drm_gem_object *obj,
159 struct vm_area_struct *vma,
160 unsigned long f_vaddr,
163 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
164 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
167 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
171 pfn = page_to_pfn(buf->pages[page_offset++]);
173 pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
175 return vm_insert_mixed(vma, f_vaddr, pfn);
178 static int exynos_drm_gem_get_pages(struct drm_gem_object *obj)
180 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
181 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
182 struct scatterlist *sgl;
184 unsigned int npages, i = 0;
188 DRM_DEBUG_KMS("already allocated.\n");
192 pages = exynos_gem_get_pages(obj, GFP_KERNEL);
194 DRM_ERROR("failed to get pages.\n");
195 return PTR_ERR(pages);
198 npages = obj->size >> PAGE_SHIFT;
200 buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
202 DRM_ERROR("failed to allocate sg table.\n");
207 ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
209 DRM_ERROR("failed to initialize sg table.\n");
216 /* set all pages to sg list. */
218 sg_set_page(sgl, pages[i], PAGE_SIZE, 0);
219 sg_dma_address(sgl) = page_to_phys(pages[i]);
224 /* add some codes for UNCACHED type here. TODO */
232 exynos_gem_put_pages(obj, pages, true, false);
237 static void exynos_drm_gem_put_pages(struct drm_gem_object *obj)
239 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
240 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
243 * if buffer typs is EXYNOS_BO_NONCONTIG then release all pages
244 * allocated at gem fault handler.
246 sg_free_table(buf->sgt);
250 exynos_gem_put_pages(obj, buf->pages, true, false);
253 /* add some codes for UNCACHED type here. TODO */
256 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
257 struct drm_file *file_priv,
258 unsigned int *handle)
263 * allocate a id of idr table where the obj is registered
264 * and handle has the id what user can see.
266 ret = drm_gem_handle_create(file_priv, obj, handle);
270 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
272 /* drop reference from allocate - handle holds it now. */
273 drm_gem_object_unreference_unlocked(obj);
278 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
280 struct drm_gem_object *obj;
281 struct exynos_drm_gem_buf *buf;
283 DRM_DEBUG_KMS("%s\n", __FILE__);
285 obj = &exynos_gem_obj->base;
286 buf = exynos_gem_obj->buffer;
288 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
293 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG)
294 exynos_drm_gem_put_pages(obj);
296 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
298 exynos_drm_fini_buf(obj->dev, buf);
299 exynos_gem_obj->buffer = NULL;
301 if (obj->map_list.map)
302 drm_gem_free_mmap_offset(obj);
304 /* release file pointer to gem object. */
305 drm_gem_object_release(obj);
307 kfree(exynos_gem_obj);
308 exynos_gem_obj = NULL;
311 static struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
314 struct exynos_drm_gem_obj *exynos_gem_obj;
315 struct drm_gem_object *obj;
318 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
319 if (!exynos_gem_obj) {
320 DRM_ERROR("failed to allocate exynos gem object\n");
324 exynos_gem_obj->size = size;
325 obj = &exynos_gem_obj->base;
327 ret = drm_gem_object_init(dev, obj, size);
329 DRM_ERROR("failed to initialize gem object\n");
330 kfree(exynos_gem_obj);
334 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
336 return exynos_gem_obj;
339 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
343 struct exynos_drm_gem_obj *exynos_gem_obj;
344 struct exynos_drm_gem_buf *buf;
348 DRM_ERROR("invalid size.\n");
349 return ERR_PTR(-EINVAL);
352 size = roundup_gem_size(size, flags);
353 DRM_DEBUG_KMS("%s\n", __FILE__);
355 ret = check_gem_flags(flags);
359 buf = exynos_drm_init_buf(dev, size);
361 return ERR_PTR(-ENOMEM);
363 exynos_gem_obj = exynos_drm_gem_init(dev, size);
364 if (!exynos_gem_obj) {
369 exynos_gem_obj->buffer = buf;
371 /* set memory type and cache attribute from user side. */
372 exynos_gem_obj->flags = flags;
375 * allocate all pages as desired size if user wants to allocate
376 * physically non-continuous memory.
378 if (flags & EXYNOS_BO_NONCONTIG) {
379 ret = exynos_drm_gem_get_pages(&exynos_gem_obj->base);
381 drm_gem_object_release(&exynos_gem_obj->base);
385 ret = exynos_drm_alloc_buf(dev, buf, flags);
387 drm_gem_object_release(&exynos_gem_obj->base);
392 return exynos_gem_obj;
395 exynos_drm_fini_buf(dev, buf);
399 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
400 struct drm_file *file_priv)
402 struct drm_exynos_gem_create *args = data;
403 struct exynos_drm_gem_obj *exynos_gem_obj;
406 DRM_DEBUG_KMS("%s\n", __FILE__);
408 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
409 if (IS_ERR(exynos_gem_obj))
410 return PTR_ERR(exynos_gem_obj);
412 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
415 exynos_drm_gem_destroy(exynos_gem_obj);
422 void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
423 unsigned int gem_handle,
424 struct drm_file *file_priv)
426 struct exynos_drm_gem_obj *exynos_gem_obj;
427 struct drm_gem_object *obj;
429 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
431 DRM_ERROR("failed to lookup gem object.\n");
432 return ERR_PTR(-EINVAL);
435 exynos_gem_obj = to_exynos_gem_obj(obj);
437 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
438 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
439 drm_gem_object_unreference_unlocked(obj);
442 return ERR_PTR(-EINVAL);
445 return &exynos_gem_obj->buffer->dma_addr;
448 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
449 unsigned int gem_handle,
450 struct drm_file *file_priv)
452 struct exynos_drm_gem_obj *exynos_gem_obj;
453 struct drm_gem_object *obj;
455 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
457 DRM_ERROR("failed to lookup gem object.\n");
461 exynos_gem_obj = to_exynos_gem_obj(obj);
463 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
464 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
465 drm_gem_object_unreference_unlocked(obj);
471 drm_gem_object_unreference_unlocked(obj);
474 * decrease obj->refcount one more time because we has already
475 * increased it at exynos_drm_gem_get_dma_addr().
477 drm_gem_object_unreference_unlocked(obj);
480 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
481 struct drm_file *file_priv)
483 struct drm_exynos_gem_map_off *args = data;
485 DRM_DEBUG_KMS("%s\n", __FILE__);
487 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
488 args->handle, (unsigned long)args->offset);
490 if (!(dev->driver->driver_features & DRIVER_GEM)) {
491 DRM_ERROR("does not support GEM.\n");
495 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
499 static int exynos_drm_gem_mmap_buffer(struct file *filp,
500 struct vm_area_struct *vma)
502 struct drm_gem_object *obj = filp->private_data;
503 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
504 struct exynos_drm_gem_buf *buffer;
505 unsigned long pfn, vm_size, usize, uaddr = vma->vm_start;
508 DRM_DEBUG_KMS("%s\n", __FILE__);
510 vma->vm_flags |= (VM_IO | VM_RESERVED);
512 update_vm_cache_attr(exynos_gem_obj, vma);
514 vm_size = usize = vma->vm_end - vma->vm_start;
517 * a buffer contains information to physically continuous memory
518 * allocated by user request or at framebuffer creation.
520 buffer = exynos_gem_obj->buffer;
522 /* check if user-requested size is valid. */
523 if (vm_size > buffer->size)
526 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
532 vma->vm_flags |= VM_MIXEDMAP;
535 ret = vm_insert_page(vma, uaddr, buffer->pages[i++]);
537 DRM_ERROR("failed to remap user space.\n");
546 * get page frame number to physical memory to be mapped
549 pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >>
552 DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
554 if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
555 vma->vm_page_prot)) {
556 DRM_ERROR("failed to remap pfn range.\n");
564 static const struct file_operations exynos_drm_gem_fops = {
565 .mmap = exynos_drm_gem_mmap_buffer,
568 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
569 struct drm_file *file_priv)
571 struct drm_exynos_gem_mmap *args = data;
572 struct drm_gem_object *obj;
575 DRM_DEBUG_KMS("%s\n", __FILE__);
577 if (!(dev->driver->driver_features & DRIVER_GEM)) {
578 DRM_ERROR("does not support GEM.\n");
582 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
584 DRM_ERROR("failed to lookup gem object.\n");
588 obj->filp->f_op = &exynos_drm_gem_fops;
589 obj->filp->private_data = obj;
591 addr = vm_mmap(obj->filp, 0, args->size,
592 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
594 drm_gem_object_unreference_unlocked(obj);
596 if (IS_ERR((void *)addr))
597 return PTR_ERR((void *)addr);
601 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
606 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
608 DRM_DEBUG_KMS("%s\n", __FILE__);
613 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
615 DRM_DEBUG_KMS("%s\n", __FILE__);
617 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
620 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
621 struct drm_device *dev,
622 struct drm_mode_create_dumb *args)
624 struct exynos_drm_gem_obj *exynos_gem_obj;
627 DRM_DEBUG_KMS("%s\n", __FILE__);
630 * alocate memory to be used for framebuffer.
631 * - this callback would be called by user application
632 * with DRM_IOCTL_MODE_CREATE_DUMB command.
635 args->pitch = args->width * args->bpp >> 3;
636 args->size = PAGE_ALIGN(args->pitch * args->height);
638 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
639 if (IS_ERR(exynos_gem_obj))
640 return PTR_ERR(exynos_gem_obj);
642 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
645 exynos_drm_gem_destroy(exynos_gem_obj);
652 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
653 struct drm_device *dev, uint32_t handle,
656 struct exynos_drm_gem_obj *exynos_gem_obj;
657 struct drm_gem_object *obj;
660 DRM_DEBUG_KMS("%s\n", __FILE__);
662 mutex_lock(&dev->struct_mutex);
665 * get offset of memory allocated for drm framebuffer.
666 * - this callback would be called by user application
667 * with DRM_IOCTL_MODE_MAP_DUMB command.
670 obj = drm_gem_object_lookup(dev, file_priv, handle);
672 DRM_ERROR("failed to lookup gem object.\n");
677 exynos_gem_obj = to_exynos_gem_obj(obj);
679 if (!exynos_gem_obj->base.map_list.map) {
680 ret = drm_gem_create_mmap_offset(&exynos_gem_obj->base);
685 *offset = (u64)exynos_gem_obj->base.map_list.hash.key << PAGE_SHIFT;
686 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
689 drm_gem_object_unreference(obj);
691 mutex_unlock(&dev->struct_mutex);
695 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
696 struct drm_device *dev,
701 DRM_DEBUG_KMS("%s\n", __FILE__);
704 * obj->refcount and obj->handle_count are decreased and
705 * if both them are 0 then exynos_drm_gem_free_object()
706 * would be called by callback to release resources.
708 ret = drm_gem_handle_delete(file_priv, handle);
710 DRM_ERROR("failed to delete drm_gem_handle.\n");
717 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
719 struct drm_gem_object *obj = vma->vm_private_data;
720 struct drm_device *dev = obj->dev;
721 unsigned long f_vaddr;
725 page_offset = ((unsigned long)vmf->virtual_address -
726 vma->vm_start) >> PAGE_SHIFT;
727 f_vaddr = (unsigned long)vmf->virtual_address;
729 mutex_lock(&dev->struct_mutex);
731 ret = exynos_drm_gem_map_pages(obj, vma, f_vaddr, page_offset);
733 DRM_ERROR("failed to map pages.\n");
735 mutex_unlock(&dev->struct_mutex);
737 return convert_to_vm_err_msg(ret);
740 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
742 struct exynos_drm_gem_obj *exynos_gem_obj;
743 struct drm_gem_object *obj;
746 DRM_DEBUG_KMS("%s\n", __FILE__);
748 /* set vm_area_struct. */
749 ret = drm_gem_mmap(filp, vma);
751 DRM_ERROR("failed to mmap.\n");
755 obj = vma->vm_private_data;
756 exynos_gem_obj = to_exynos_gem_obj(obj);
758 ret = check_gem_flags(exynos_gem_obj->flags);
760 drm_gem_vm_close(vma);
761 drm_gem_free_mmap_offset(obj);
765 vma->vm_flags &= ~VM_PFNMAP;
766 vma->vm_flags |= VM_MIXEDMAP;
768 update_vm_cache_attr(exynos_gem_obj, vma);