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,
102 struct page *p, **pages;
105 npages = obj->size >> PAGE_SHIFT;
107 pages = drm_malloc_ab(npages, sizeof(struct page *));
109 return ERR_PTR(-ENOMEM);
111 for (i = 0; i < npages; i++) {
112 p = alloc_page(gfpmask);
122 __free_page(pages[i]);
124 drm_free_large(pages);
125 return ERR_PTR(PTR_ERR(p));
128 static void exynos_gem_put_pages(struct drm_gem_object *obj,
133 npages = obj->size >> PAGE_SHIFT;
135 while (--npages >= 0)
136 __free_page(pages[npages]);
138 drm_free_large(pages);
141 static int exynos_drm_gem_map_pages(struct drm_gem_object *obj,
142 struct vm_area_struct *vma,
143 unsigned long f_vaddr,
146 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
147 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
150 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
154 pfn = page_to_pfn(buf->pages[page_offset++]);
156 pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
158 return vm_insert_mixed(vma, f_vaddr, pfn);
161 static int exynos_drm_gem_get_pages(struct drm_gem_object *obj)
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;
165 struct scatterlist *sgl;
167 unsigned int npages, i = 0;
171 DRM_DEBUG_KMS("already allocated.\n");
175 pages = exynos_gem_get_pages(obj, GFP_HIGHUSER_MOVABLE);
177 DRM_ERROR("failed to get pages.\n");
178 return PTR_ERR(pages);
181 npages = obj->size >> PAGE_SHIFT;
182 buf->page_size = PAGE_SIZE;
184 buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
186 DRM_ERROR("failed to allocate sg table.\n");
191 ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
193 DRM_ERROR("failed to initialize sg table.\n");
200 /* set all pages to sg list. */
202 sg_set_page(sgl, pages[i], PAGE_SIZE, 0);
203 sg_dma_address(sgl) = page_to_phys(pages[i]);
208 /* add some codes for UNCACHED type here. TODO */
216 exynos_gem_put_pages(obj, pages);
221 static void exynos_drm_gem_put_pages(struct drm_gem_object *obj)
223 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
224 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
227 * if buffer typs is EXYNOS_BO_NONCONTIG then release all pages
228 * allocated at gem fault handler.
230 sg_free_table(buf->sgt);
234 exynos_gem_put_pages(obj, buf->pages);
237 /* add some codes for UNCACHED type here. TODO */
240 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
241 struct drm_file *file_priv,
242 unsigned int *handle)
247 * allocate a id of idr table where the obj is registered
248 * and handle has the id what user can see.
250 ret = drm_gem_handle_create(file_priv, obj, handle);
254 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
256 /* drop reference from allocate - handle holds it now. */
257 drm_gem_object_unreference_unlocked(obj);
262 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
264 struct drm_gem_object *obj;
265 struct exynos_drm_gem_buf *buf;
267 DRM_DEBUG_KMS("%s\n", __FILE__);
269 obj = &exynos_gem_obj->base;
270 buf = exynos_gem_obj->buffer;
272 DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
278 * do not release memory region from exporter.
280 * the region will be released by exporter
281 * once dmabuf's refcount becomes 0.
283 if (obj->import_attach)
286 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG)
287 exynos_drm_gem_put_pages(obj);
289 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
292 exynos_drm_fini_buf(obj->dev, buf);
293 exynos_gem_obj->buffer = NULL;
295 if (obj->map_list.map)
296 drm_gem_free_mmap_offset(obj);
298 /* release file pointer to gem object. */
299 drm_gem_object_release(obj);
301 kfree(exynos_gem_obj);
302 exynos_gem_obj = NULL;
305 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
308 struct exynos_drm_gem_obj *exynos_gem_obj;
309 struct drm_gem_object *obj;
312 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
313 if (!exynos_gem_obj) {
314 DRM_ERROR("failed to allocate exynos gem object\n");
318 exynos_gem_obj->size = size;
319 obj = &exynos_gem_obj->base;
321 ret = drm_gem_object_init(dev, obj, size);
323 DRM_ERROR("failed to initialize gem object\n");
324 kfree(exynos_gem_obj);
328 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
330 return exynos_gem_obj;
333 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
337 struct exynos_drm_gem_obj *exynos_gem_obj;
338 struct exynos_drm_gem_buf *buf;
342 DRM_ERROR("invalid size.\n");
343 return ERR_PTR(-EINVAL);
346 size = roundup_gem_size(size, flags);
347 DRM_DEBUG_KMS("%s\n", __FILE__);
349 ret = check_gem_flags(flags);
353 buf = exynos_drm_init_buf(dev, size);
355 return ERR_PTR(-ENOMEM);
357 exynos_gem_obj = exynos_drm_gem_init(dev, size);
358 if (!exynos_gem_obj) {
363 exynos_gem_obj->buffer = buf;
365 /* set memory type and cache attribute from user side. */
366 exynos_gem_obj->flags = flags;
369 * allocate all pages as desired size if user wants to allocate
370 * physically non-continuous memory.
372 if (flags & EXYNOS_BO_NONCONTIG) {
373 ret = exynos_drm_gem_get_pages(&exynos_gem_obj->base);
375 drm_gem_object_release(&exynos_gem_obj->base);
379 ret = exynos_drm_alloc_buf(dev, buf, flags);
381 drm_gem_object_release(&exynos_gem_obj->base);
386 return exynos_gem_obj;
389 exynos_drm_fini_buf(dev, buf);
393 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
394 struct drm_file *file_priv)
396 struct drm_exynos_gem_create *args = data;
397 struct exynos_drm_gem_obj *exynos_gem_obj;
400 DRM_DEBUG_KMS("%s\n", __FILE__);
402 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
403 if (IS_ERR(exynos_gem_obj))
404 return PTR_ERR(exynos_gem_obj);
406 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
409 exynos_drm_gem_destroy(exynos_gem_obj);
416 void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
417 unsigned int gem_handle,
418 struct drm_file *file_priv)
420 struct exynos_drm_gem_obj *exynos_gem_obj;
421 struct drm_gem_object *obj;
423 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
425 DRM_ERROR("failed to lookup gem object.\n");
426 return ERR_PTR(-EINVAL);
429 exynos_gem_obj = to_exynos_gem_obj(obj);
431 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
432 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
433 drm_gem_object_unreference_unlocked(obj);
436 return ERR_PTR(-EINVAL);
439 return &exynos_gem_obj->buffer->dma_addr;
442 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
443 unsigned int gem_handle,
444 struct drm_file *file_priv)
446 struct exynos_drm_gem_obj *exynos_gem_obj;
447 struct drm_gem_object *obj;
449 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
451 DRM_ERROR("failed to lookup gem object.\n");
455 exynos_gem_obj = to_exynos_gem_obj(obj);
457 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
458 DRM_DEBUG_KMS("not support NONCONTIG type.\n");
459 drm_gem_object_unreference_unlocked(obj);
465 drm_gem_object_unreference_unlocked(obj);
468 * decrease obj->refcount one more time because we has already
469 * increased it at exynos_drm_gem_get_dma_addr().
471 drm_gem_object_unreference_unlocked(obj);
474 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
475 struct drm_file *file_priv)
477 struct drm_exynos_gem_map_off *args = data;
479 DRM_DEBUG_KMS("%s\n", __FILE__);
481 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
482 args->handle, (unsigned long)args->offset);
484 if (!(dev->driver->driver_features & DRIVER_GEM)) {
485 DRM_ERROR("does not support GEM.\n");
489 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
493 static int exynos_drm_gem_mmap_buffer(struct file *filp,
494 struct vm_area_struct *vma)
496 struct drm_gem_object *obj = filp->private_data;
497 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
498 struct exynos_drm_gem_buf *buffer;
499 unsigned long pfn, vm_size, usize, uaddr = vma->vm_start;
502 DRM_DEBUG_KMS("%s\n", __FILE__);
504 vma->vm_flags |= (VM_IO | VM_RESERVED);
506 update_vm_cache_attr(exynos_gem_obj, vma);
508 vm_size = usize = vma->vm_end - vma->vm_start;
511 * a buffer contains information to physically continuous memory
512 * allocated by user request or at framebuffer creation.
514 buffer = exynos_gem_obj->buffer;
516 /* check if user-requested size is valid. */
517 if (vm_size > buffer->size)
520 if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
526 vma->vm_flags |= VM_MIXEDMAP;
529 ret = vm_insert_page(vma, uaddr, buffer->pages[i++]);
531 DRM_ERROR("failed to remap user space.\n");
540 * get page frame number to physical memory to be mapped
543 pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >>
546 DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
548 if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
549 vma->vm_page_prot)) {
550 DRM_ERROR("failed to remap pfn range.\n");
558 static const struct file_operations exynos_drm_gem_fops = {
559 .mmap = exynos_drm_gem_mmap_buffer,
562 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
563 struct drm_file *file_priv)
565 struct drm_exynos_gem_mmap *args = data;
566 struct drm_gem_object *obj;
569 DRM_DEBUG_KMS("%s\n", __FILE__);
571 if (!(dev->driver->driver_features & DRIVER_GEM)) {
572 DRM_ERROR("does not support GEM.\n");
576 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
578 DRM_ERROR("failed to lookup gem object.\n");
582 obj->filp->f_op = &exynos_drm_gem_fops;
583 obj->filp->private_data = obj;
585 addr = vm_mmap(obj->filp, 0, args->size,
586 PROT_READ | PROT_WRITE, MAP_SHARED, 0);
588 drm_gem_object_unreference_unlocked(obj);
590 if (IS_ERR((void *)addr))
591 return PTR_ERR((void *)addr);
595 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
600 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
601 struct drm_file *file_priv)
602 { struct exynos_drm_gem_obj *exynos_gem_obj;
603 struct drm_exynos_gem_info *args = data;
604 struct drm_gem_object *obj;
606 mutex_lock(&dev->struct_mutex);
608 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
610 DRM_ERROR("failed to lookup gem object.\n");
611 mutex_unlock(&dev->struct_mutex);
615 exynos_gem_obj = to_exynos_gem_obj(obj);
617 args->flags = exynos_gem_obj->flags;
618 args->size = exynos_gem_obj->size;
620 drm_gem_object_unreference(obj);
621 mutex_unlock(&dev->struct_mutex);
626 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
628 DRM_DEBUG_KMS("%s\n", __FILE__);
633 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
635 struct exynos_drm_gem_obj *exynos_gem_obj;
636 struct exynos_drm_gem_buf *buf;
638 DRM_DEBUG_KMS("%s\n", __FILE__);
640 exynos_gem_obj = to_exynos_gem_obj(obj);
641 buf = exynos_gem_obj->buffer;
643 if (obj->import_attach)
644 drm_prime_gem_destroy(obj, buf->sgt);
646 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
649 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
650 struct drm_device *dev,
651 struct drm_mode_create_dumb *args)
653 struct exynos_drm_gem_obj *exynos_gem_obj;
656 DRM_DEBUG_KMS("%s\n", __FILE__);
659 * alocate memory to be used for framebuffer.
660 * - this callback would be called by user application
661 * with DRM_IOCTL_MODE_CREATE_DUMB command.
664 args->pitch = args->width * ((args->bpp + 7) / 8);
665 args->size = PAGE_ALIGN(args->pitch * args->height);
667 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
668 if (IS_ERR(exynos_gem_obj))
669 return PTR_ERR(exynos_gem_obj);
671 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
674 exynos_drm_gem_destroy(exynos_gem_obj);
681 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
682 struct drm_device *dev, uint32_t handle,
685 struct drm_gem_object *obj;
688 DRM_DEBUG_KMS("%s\n", __FILE__);
690 mutex_lock(&dev->struct_mutex);
693 * get offset of memory allocated for drm framebuffer.
694 * - this callback would be called by user application
695 * with DRM_IOCTL_MODE_MAP_DUMB command.
698 obj = drm_gem_object_lookup(dev, file_priv, handle);
700 DRM_ERROR("failed to lookup gem object.\n");
705 if (!obj->map_list.map) {
706 ret = drm_gem_create_mmap_offset(obj);
711 *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
712 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
715 drm_gem_object_unreference(obj);
717 mutex_unlock(&dev->struct_mutex);
721 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
722 struct drm_device *dev,
727 DRM_DEBUG_KMS("%s\n", __FILE__);
730 * obj->refcount and obj->handle_count are decreased and
731 * if both them are 0 then exynos_drm_gem_free_object()
732 * would be called by callback to release resources.
734 ret = drm_gem_handle_delete(file_priv, handle);
736 DRM_ERROR("failed to delete drm_gem_handle.\n");
743 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
745 struct drm_gem_object *obj = vma->vm_private_data;
746 struct drm_device *dev = obj->dev;
747 unsigned long f_vaddr;
751 page_offset = ((unsigned long)vmf->virtual_address -
752 vma->vm_start) >> PAGE_SHIFT;
753 f_vaddr = (unsigned long)vmf->virtual_address;
755 mutex_lock(&dev->struct_mutex);
757 ret = exynos_drm_gem_map_pages(obj, vma, f_vaddr, page_offset);
759 DRM_ERROR("failed to map pages.\n");
761 mutex_unlock(&dev->struct_mutex);
763 return convert_to_vm_err_msg(ret);
766 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
768 struct exynos_drm_gem_obj *exynos_gem_obj;
769 struct drm_gem_object *obj;
772 DRM_DEBUG_KMS("%s\n", __FILE__);
774 /* set vm_area_struct. */
775 ret = drm_gem_mmap(filp, vma);
777 DRM_ERROR("failed to mmap.\n");
781 obj = vma->vm_private_data;
782 exynos_gem_obj = to_exynos_gem_obj(obj);
784 ret = check_gem_flags(exynos_gem_obj->flags);
786 drm_gem_vm_close(vma);
787 drm_gem_free_mmap_offset(obj);
791 vma->vm_flags &= ~VM_PFNMAP;
792 vma->vm_flags |= VM_MIXEDMAP;
794 update_vm_cache_attr(exynos_gem_obj, vma);