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 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;
199 buf->page_size = PAGE_SIZE;
201 buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
203 DRM_ERROR("failed to allocate sg table.\n");
208 ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
210 DRM_ERROR("failed to initialize sg table.\n");
217 /* set all pages to sg list. */
219 sg_set_page(sgl, pages[i], PAGE_SIZE, 0);
220 sg_dma_address(sgl) = page_to_phys(pages[i]);
225 /* add some codes for UNCACHED type here. TODO */
233 exynos_gem_put_pages(obj, pages, true, false);
238 static void exynos_drm_gem_put_pages(struct drm_gem_object *obj)
240 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
241 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
244 * if buffer typs is EXYNOS_BO_NONCONTIG then release all pages
245 * allocated at gem fault handler.
247 sg_free_table(buf->sgt);
251 exynos_gem_put_pages(obj, buf->pages, true, false);
254 /* add some codes for UNCACHED type here. TODO */
257 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
258 struct drm_file *file_priv,
259 unsigned int *handle)
264 * allocate a id of idr table where the obj is registered
265 * and handle has the id what user can see.
267 ret = drm_gem_handle_create(file_priv, obj, handle);
271 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
273 /* drop reference from allocate - handle holds it now. */
274 drm_gem_object_unreference_unlocked(obj);
279 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
281 struct drm_gem_object *obj;
282 struct exynos_drm_gem_buf *buf;
284 DRM_DEBUG_KMS("%s\n", __FILE__);
286 obj = &exynos_gem_obj->base;
287 buf = exynos_gem_obj->buffer;
289 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
294 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG)
295 exynos_drm_gem_put_pages(obj);
297 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
299 exynos_drm_fini_buf(obj->dev, buf);
300 exynos_gem_obj->buffer = NULL;
302 if (obj->map_list.map)
303 drm_gem_free_mmap_offset(obj);
305 /* release file pointer to gem object. */
306 drm_gem_object_release(obj);
308 kfree(exynos_gem_obj);
309 exynos_gem_obj = NULL;
312 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
315 struct exynos_drm_gem_obj *exynos_gem_obj;
316 struct drm_gem_object *obj;
319 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
320 if (!exynos_gem_obj) {
321 DRM_ERROR("failed to allocate exynos gem object\n");
325 exynos_gem_obj->size = size;
326 obj = &exynos_gem_obj->base;
328 ret = drm_gem_object_init(dev, obj, size);
330 DRM_ERROR("failed to initialize gem object\n");
331 kfree(exynos_gem_obj);
335 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
337 return exynos_gem_obj;
340 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
344 struct exynos_drm_gem_obj *exynos_gem_obj;
345 struct exynos_drm_gem_buf *buf;
349 DRM_ERROR("invalid size.\n");
350 return ERR_PTR(-EINVAL);
353 size = roundup_gem_size(size, flags);
354 DRM_DEBUG_KMS("%s\n", __FILE__);
356 ret = check_gem_flags(flags);
360 buf = exynos_drm_init_buf(dev, size);
362 return ERR_PTR(-ENOMEM);
364 exynos_gem_obj = exynos_drm_gem_init(dev, size);
365 if (!exynos_gem_obj) {
370 exynos_gem_obj->buffer = buf;
372 /* set memory type and cache attribute from user side. */
373 exynos_gem_obj->flags = flags;
376 * allocate all pages as desired size if user wants to allocate
377 * physically non-continuous memory.
379 if (flags & EXYNOS_BO_NONCONTIG) {
380 ret = exynos_drm_gem_get_pages(&exynos_gem_obj->base);
382 drm_gem_object_release(&exynos_gem_obj->base);
386 ret = exynos_drm_alloc_buf(dev, buf, flags);
388 drm_gem_object_release(&exynos_gem_obj->base);
393 return exynos_gem_obj;
396 exynos_drm_fini_buf(dev, buf);
400 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
401 struct drm_file *file_priv)
403 struct drm_exynos_gem_create *args = data;
404 struct exynos_drm_gem_obj *exynos_gem_obj;
407 DRM_DEBUG_KMS("%s\n", __FILE__);
409 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
410 if (IS_ERR(exynos_gem_obj))
411 return PTR_ERR(exynos_gem_obj);
413 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
416 exynos_drm_gem_destroy(exynos_gem_obj);
423 void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
424 unsigned int gem_handle,
425 struct drm_file *file_priv)
427 struct exynos_drm_gem_obj *exynos_gem_obj;
428 struct drm_gem_object *obj;
430 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
432 DRM_ERROR("failed to lookup gem object.\n");
433 return ERR_PTR(-EINVAL);
436 exynos_gem_obj = to_exynos_gem_obj(obj);
438 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
439 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
440 drm_gem_object_unreference_unlocked(obj);
443 return ERR_PTR(-EINVAL);
446 return &exynos_gem_obj->buffer->dma_addr;
449 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
450 unsigned int gem_handle,
451 struct drm_file *file_priv)
453 struct exynos_drm_gem_obj *exynos_gem_obj;
454 struct drm_gem_object *obj;
456 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
458 DRM_ERROR("failed to lookup gem object.\n");
462 exynos_gem_obj = to_exynos_gem_obj(obj);
464 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
465 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
466 drm_gem_object_unreference_unlocked(obj);
472 drm_gem_object_unreference_unlocked(obj);
475 * decrease obj->refcount one more time because we has already
476 * increased it at exynos_drm_gem_get_dma_addr().
478 drm_gem_object_unreference_unlocked(obj);
481 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
482 struct drm_file *file_priv)
484 struct drm_exynos_gem_map_off *args = data;
486 DRM_DEBUG_KMS("%s\n", __FILE__);
488 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
489 args->handle, (unsigned long)args->offset);
491 if (!(dev->driver->driver_features & DRIVER_GEM)) {
492 DRM_ERROR("does not support GEM.\n");
496 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
500 static int exynos_drm_gem_mmap_buffer(struct file *filp,
501 struct vm_area_struct *vma)
503 struct drm_gem_object *obj = filp->private_data;
504 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
505 struct exynos_drm_gem_buf *buffer;
506 unsigned long pfn, vm_size, usize, uaddr = vma->vm_start;
509 DRM_DEBUG_KMS("%s\n", __FILE__);
511 vma->vm_flags |= (VM_IO | VM_RESERVED);
513 update_vm_cache_attr(exynos_gem_obj, vma);
515 vm_size = usize = vma->vm_end - vma->vm_start;
518 * a buffer contains information to physically continuous memory
519 * allocated by user request or at framebuffer creation.
521 buffer = exynos_gem_obj->buffer;
523 /* check if user-requested size is valid. */
524 if (vm_size > buffer->size)
527 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
533 vma->vm_flags |= VM_MIXEDMAP;
536 ret = vm_insert_page(vma, uaddr, buffer->pages[i++]);
538 DRM_ERROR("failed to remap user space.\n");
547 * get page frame number to physical memory to be mapped
550 pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >>
553 DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
555 if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
556 vma->vm_page_prot)) {
557 DRM_ERROR("failed to remap pfn range.\n");
565 static const struct file_operations exynos_drm_gem_fops = {
566 .mmap = exynos_drm_gem_mmap_buffer,
569 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
570 struct drm_file *file_priv)
572 struct drm_exynos_gem_mmap *args = data;
573 struct drm_gem_object *obj;
576 DRM_DEBUG_KMS("%s\n", __FILE__);
578 if (!(dev->driver->driver_features & DRIVER_GEM)) {
579 DRM_ERROR("does not support GEM.\n");
583 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
585 DRM_ERROR("failed to lookup gem object.\n");
589 obj->filp->f_op = &exynos_drm_gem_fops;
590 obj->filp->private_data = obj;
592 addr = vm_mmap(obj->filp, 0, args->size,
593 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
595 drm_gem_object_unreference_unlocked(obj);
597 if (IS_ERR((void *)addr))
598 return PTR_ERR((void *)addr);
602 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
607 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
608 struct drm_file *file_priv)
609 { struct exynos_drm_gem_obj *exynos_gem_obj;
610 struct drm_exynos_gem_info *args = data;
611 struct drm_gem_object *obj;
613 mutex_lock(&dev->struct_mutex);
615 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
617 DRM_ERROR("failed to lookup gem object.\n");
618 mutex_unlock(&dev->struct_mutex);
622 exynos_gem_obj = to_exynos_gem_obj(obj);
624 args->flags = exynos_gem_obj->flags;
625 args->size = exynos_gem_obj->size;
627 drm_gem_object_unreference(obj);
628 mutex_unlock(&dev->struct_mutex);
633 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
635 DRM_DEBUG_KMS("%s\n", __FILE__);
640 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
642 struct exynos_drm_gem_obj *exynos_gem_obj;
643 struct exynos_drm_gem_buf *buf;
645 DRM_DEBUG_KMS("%s\n", __FILE__);
647 exynos_gem_obj = to_exynos_gem_obj(obj);
648 buf = exynos_gem_obj->buffer;
650 if (obj->import_attach)
651 drm_prime_gem_destroy(obj, buf->sgt);
653 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
656 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
657 struct drm_device *dev,
658 struct drm_mode_create_dumb *args)
660 struct exynos_drm_gem_obj *exynos_gem_obj;
663 DRM_DEBUG_KMS("%s\n", __FILE__);
666 * alocate memory to be used for framebuffer.
667 * - this callback would be called by user application
668 * with DRM_IOCTL_MODE_CREATE_DUMB command.
671 args->pitch = args->width * args->bpp >> 3;
672 args->size = PAGE_ALIGN(args->pitch * args->height);
674 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
675 if (IS_ERR(exynos_gem_obj))
676 return PTR_ERR(exynos_gem_obj);
678 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
681 exynos_drm_gem_destroy(exynos_gem_obj);
688 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
689 struct drm_device *dev, uint32_t handle,
692 struct drm_gem_object *obj;
695 DRM_DEBUG_KMS("%s\n", __FILE__);
697 mutex_lock(&dev->struct_mutex);
700 * get offset of memory allocated for drm framebuffer.
701 * - this callback would be called by user application
702 * with DRM_IOCTL_MODE_MAP_DUMB command.
705 obj = drm_gem_object_lookup(dev, file_priv, handle);
707 DRM_ERROR("failed to lookup gem object.\n");
712 if (!obj->map_list.map) {
713 ret = drm_gem_create_mmap_offset(obj);
718 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
719 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
722 drm_gem_object_unreference(obj);
724 mutex_unlock(&dev->struct_mutex);
728 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
729 struct drm_device *dev,
734 DRM_DEBUG_KMS("%s\n", __FILE__);
737 * obj->refcount and obj->handle_count are decreased and
738 * if both them are 0 then exynos_drm_gem_free_object()
739 * would be called by callback to release resources.
741 ret = drm_gem_handle_delete(file_priv, handle);
743 DRM_ERROR("failed to delete drm_gem_handle.\n");
750 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
752 struct drm_gem_object *obj = vma->vm_private_data;
753 struct drm_device *dev = obj->dev;
754 unsigned long f_vaddr;
758 page_offset = ((unsigned long)vmf->virtual_address -
759 vma->vm_start) >> PAGE_SHIFT;
760 f_vaddr = (unsigned long)vmf->virtual_address;
762 mutex_lock(&dev->struct_mutex);
764 ret = exynos_drm_gem_map_pages(obj, vma, f_vaddr, page_offset);
766 DRM_ERROR("failed to map pages.\n");
768 mutex_unlock(&dev->struct_mutex);
770 return convert_to_vm_err_msg(ret);
773 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
775 struct exynos_drm_gem_obj *exynos_gem_obj;
776 struct drm_gem_object *obj;
779 DRM_DEBUG_KMS("%s\n", __FILE__);
781 /* set vm_area_struct. */
782 ret = drm_gem_mmap(filp, vma);
784 DRM_ERROR("failed to mmap.\n");
788 obj = vma->vm_private_data;
789 exynos_gem_obj = to_exynos_gem_obj(obj);
791 ret = check_gem_flags(exynos_gem_obj->flags);
793 drm_gem_vm_close(vma);
794 drm_gem_free_mmap_offset(obj);
798 vma->vm_flags &= ~VM_PFNMAP;
799 vma->vm_flags |= VM_MIXEDMAP;
801 update_vm_cache_attr(exynos_gem_obj, vma);