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.
13 #include <drm/drm_vma_manager.h>
15 #include <linux/shmem_fs.h>
16 #include <linux/dma-buf.h>
17 #include <drm/exynos_drm.h>
19 #include "exynos_drm_drv.h"
20 #include "exynos_drm_gem.h"
21 #include "exynos_drm_iommu.h"
23 static int exynos_drm_alloc_buf(struct exynos_drm_gem_obj *obj)
25 struct drm_device *dev = obj->base.dev;
27 unsigned int nr_pages;
30 DRM_DEBUG_KMS("already allocated.\n");
34 init_dma_attrs(&obj->dma_attrs);
37 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
38 * region will be allocated else physically contiguous
41 if (!(obj->flags & EXYNOS_BO_NONCONTIG))
42 dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &obj->dma_attrs);
45 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
46 * else cachable mapping.
48 if (obj->flags & EXYNOS_BO_WC || !(obj->flags & EXYNOS_BO_CACHABLE))
49 attr = DMA_ATTR_WRITE_COMBINE;
51 attr = DMA_ATTR_NON_CONSISTENT;
53 dma_set_attr(attr, &obj->dma_attrs);
54 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &obj->dma_attrs);
56 nr_pages = obj->size >> PAGE_SHIFT;
58 if (!is_drm_iommu_supported(dev)) {
59 dma_addr_t start_addr;
62 obj->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
64 DRM_ERROR("failed to allocate pages.\n");
68 obj->cookie = dma_alloc_attrs(dev->dev,
70 &obj->dma_addr, GFP_KERNEL,
73 DRM_ERROR("failed to allocate buffer.\n");
74 drm_free_large(obj->pages);
78 start_addr = obj->dma_addr;
79 while (i < nr_pages) {
80 obj->pages[i] = phys_to_page(start_addr);
81 start_addr += PAGE_SIZE;
85 obj->pages = dma_alloc_attrs(dev->dev, obj->size,
86 &obj->dma_addr, GFP_KERNEL,
89 DRM_ERROR("failed to allocate buffer.\n");
94 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
95 (unsigned long)obj->dma_addr,
101 static void exynos_drm_free_buf(struct exynos_drm_gem_obj *obj)
103 struct drm_device *dev = obj->base.dev;
105 if (!obj->dma_addr) {
106 DRM_DEBUG_KMS("dma_addr is invalid.\n");
110 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
111 (unsigned long)obj->dma_addr, obj->size);
113 if (!is_drm_iommu_supported(dev)) {
114 dma_free_attrs(dev->dev, obj->size, obj->cookie,
115 (dma_addr_t)obj->dma_addr, &obj->dma_attrs);
116 drm_free_large(obj->pages);
118 dma_free_attrs(dev->dev, obj->size, obj->pages,
119 (dma_addr_t)obj->dma_addr, &obj->dma_attrs);
121 obj->dma_addr = (dma_addr_t)NULL;
124 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
125 struct drm_file *file_priv,
126 unsigned int *handle)
131 * allocate a id of idr table where the obj is registered
132 * and handle has the id what user can see.
134 ret = drm_gem_handle_create(file_priv, obj, handle);
138 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
140 /* drop reference from allocate - handle holds it now. */
141 drm_gem_object_unreference_unlocked(obj);
146 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
148 struct drm_gem_object *obj = &exynos_gem_obj->base;
150 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
153 * do not release memory region from exporter.
155 * the region will be released by exporter
156 * once dmabuf's refcount becomes 0.
158 if (obj->import_attach)
161 exynos_drm_free_buf(exynos_gem_obj);
164 drm_gem_free_mmap_offset(obj);
166 /* release file pointer to gem object. */
167 drm_gem_object_release(obj);
169 kfree(exynos_gem_obj);
170 exynos_gem_obj = NULL;
173 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
174 unsigned int gem_handle,
175 struct drm_file *file_priv)
177 struct exynos_drm_gem_obj *exynos_gem_obj;
178 struct drm_gem_object *obj;
180 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
182 DRM_ERROR("failed to lookup gem object.\n");
186 exynos_gem_obj = to_exynos_gem_obj(obj);
188 drm_gem_object_unreference_unlocked(obj);
190 return exynos_gem_obj->size;
194 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
197 struct exynos_drm_gem_obj *exynos_gem_obj;
198 struct drm_gem_object *obj;
201 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
203 return ERR_PTR(-ENOMEM);
205 exynos_gem_obj->size = size;
206 obj = &exynos_gem_obj->base;
208 ret = drm_gem_object_init(dev, obj, size);
210 DRM_ERROR("failed to initialize gem object\n");
211 kfree(exynos_gem_obj);
215 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
217 return exynos_gem_obj;
220 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
224 struct exynos_drm_gem_obj *exynos_gem_obj;
227 if (flags & ~(EXYNOS_BO_MASK)) {
228 DRM_ERROR("invalid flags.\n");
229 return ERR_PTR(-EINVAL);
233 DRM_ERROR("invalid size.\n");
234 return ERR_PTR(-EINVAL);
237 size = roundup(size, PAGE_SIZE);
239 exynos_gem_obj = exynos_drm_gem_init(dev, size);
240 if (IS_ERR(exynos_gem_obj))
241 return exynos_gem_obj;
243 /* set memory type and cache attribute from user side. */
244 exynos_gem_obj->flags = flags;
246 ret = exynos_drm_alloc_buf(exynos_gem_obj);
248 drm_gem_object_release(&exynos_gem_obj->base);
249 kfree(exynos_gem_obj);
253 return exynos_gem_obj;
256 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
257 struct drm_file *file_priv)
259 struct drm_exynos_gem_create *args = data;
260 struct exynos_drm_gem_obj *exynos_gem_obj;
263 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
264 if (IS_ERR(exynos_gem_obj))
265 return PTR_ERR(exynos_gem_obj);
267 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
270 exynos_drm_gem_destroy(exynos_gem_obj);
277 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
278 unsigned int gem_handle,
279 struct drm_file *filp)
281 struct exynos_drm_gem_obj *exynos_gem_obj;
282 struct drm_gem_object *obj;
284 obj = drm_gem_object_lookup(dev, filp, gem_handle);
286 DRM_ERROR("failed to lookup gem object.\n");
287 return ERR_PTR(-EINVAL);
290 exynos_gem_obj = to_exynos_gem_obj(obj);
292 return &exynos_gem_obj->dma_addr;
295 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
296 unsigned int gem_handle,
297 struct drm_file *filp)
299 struct drm_gem_object *obj;
301 obj = drm_gem_object_lookup(dev, filp, gem_handle);
303 DRM_ERROR("failed to lookup gem object.\n");
307 drm_gem_object_unreference_unlocked(obj);
310 * decrease obj->refcount one more time because we has already
311 * increased it at exynos_drm_gem_get_dma_addr().
313 drm_gem_object_unreference_unlocked(obj);
316 int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj,
317 struct vm_area_struct *vma)
319 struct drm_device *drm_dev = exynos_gem_obj->base.dev;
320 unsigned long vm_size;
323 vma->vm_flags &= ~VM_PFNMAP;
326 vm_size = vma->vm_end - vma->vm_start;
328 /* check if user-requested size is valid. */
329 if (vm_size > exynos_gem_obj->size)
332 ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem_obj->pages,
333 exynos_gem_obj->dma_addr, exynos_gem_obj->size,
334 &exynos_gem_obj->dma_attrs);
336 DRM_ERROR("failed to mmap.\n");
343 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
344 struct drm_file *file_priv)
345 { struct exynos_drm_gem_obj *exynos_gem_obj;
346 struct drm_exynos_gem_info *args = data;
347 struct drm_gem_object *obj;
349 mutex_lock(&dev->struct_mutex);
351 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
353 DRM_ERROR("failed to lookup gem object.\n");
354 mutex_unlock(&dev->struct_mutex);
358 exynos_gem_obj = to_exynos_gem_obj(obj);
360 args->flags = exynos_gem_obj->flags;
361 args->size = exynos_gem_obj->size;
363 drm_gem_object_unreference(obj);
364 mutex_unlock(&dev->struct_mutex);
369 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
370 struct sg_table *sgt,
371 enum dma_data_direction dir)
375 mutex_lock(&drm_dev->struct_mutex);
377 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
379 DRM_ERROR("failed to map sgl with dma.\n");
380 mutex_unlock(&drm_dev->struct_mutex);
384 mutex_unlock(&drm_dev->struct_mutex);
388 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
389 struct sg_table *sgt,
390 enum dma_data_direction dir)
392 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
395 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
397 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
400 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
401 struct drm_device *dev,
402 struct drm_mode_create_dumb *args)
404 struct exynos_drm_gem_obj *exynos_gem_obj;
408 * allocate memory to be used for framebuffer.
409 * - this callback would be called by user application
410 * with DRM_IOCTL_MODE_CREATE_DUMB command.
413 args->pitch = args->width * ((args->bpp + 7) / 8);
414 args->size = args->pitch * args->height;
416 if (is_drm_iommu_supported(dev)) {
417 exynos_gem_obj = exynos_drm_gem_create(dev,
418 EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
421 exynos_gem_obj = exynos_drm_gem_create(dev,
422 EXYNOS_BO_CONTIG | EXYNOS_BO_WC,
426 if (IS_ERR(exynos_gem_obj)) {
427 dev_warn(dev->dev, "FB allocation failed.\n");
428 return PTR_ERR(exynos_gem_obj);
431 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
434 exynos_drm_gem_destroy(exynos_gem_obj);
441 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
442 struct drm_device *dev, uint32_t handle,
445 struct drm_gem_object *obj;
448 mutex_lock(&dev->struct_mutex);
451 * get offset of memory allocated for drm framebuffer.
452 * - this callback would be called by user application
453 * with DRM_IOCTL_MODE_MAP_DUMB command.
456 obj = drm_gem_object_lookup(dev, file_priv, handle);
458 DRM_ERROR("failed to lookup gem object.\n");
463 ret = drm_gem_create_mmap_offset(obj);
467 *offset = drm_vma_node_offset_addr(&obj->vma_node);
468 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
471 drm_gem_object_unreference(obj);
473 mutex_unlock(&dev->struct_mutex);
477 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
479 struct drm_gem_object *obj = vma->vm_private_data;
480 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
485 page_offset = ((unsigned long)vmf->virtual_address -
486 vma->vm_start) >> PAGE_SHIFT;
488 if (page_offset >= (exynos_gem_obj->size >> PAGE_SHIFT)) {
489 DRM_ERROR("invalid page offset\n");
494 pfn = page_to_pfn(exynos_gem_obj->pages[page_offset]);
495 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
502 return VM_FAULT_NOPAGE;
506 return VM_FAULT_SIGBUS;
510 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
512 struct exynos_drm_gem_obj *exynos_gem_obj;
513 struct drm_gem_object *obj;
516 /* set vm_area_struct. */
517 ret = drm_gem_mmap(filp, vma);
519 DRM_ERROR("failed to mmap.\n");
523 obj = vma->vm_private_data;
524 exynos_gem_obj = to_exynos_gem_obj(obj);
526 DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem_obj->flags);
528 /* non-cachable as default. */
529 if (exynos_gem_obj->flags & EXYNOS_BO_CACHABLE)
530 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
531 else if (exynos_gem_obj->flags & EXYNOS_BO_WC)
533 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
536 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
538 ret = exynos_drm_gem_mmap_buffer(exynos_gem_obj, vma);
545 drm_gem_vm_close(vma);
546 drm_gem_free_mmap_offset(obj);
551 /* low-level interface prime helpers */
552 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
554 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
557 npages = exynos_gem_obj->size >> PAGE_SHIFT;
559 return drm_prime_pages_to_sg(exynos_gem_obj->pages, npages);
562 struct drm_gem_object *
563 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
564 struct dma_buf_attachment *attach,
565 struct sg_table *sgt)
567 struct exynos_drm_gem_obj *exynos_gem_obj;
571 exynos_gem_obj = exynos_drm_gem_init(dev, attach->dmabuf->size);
572 if (IS_ERR(exynos_gem_obj)) {
573 ret = PTR_ERR(exynos_gem_obj);
577 exynos_gem_obj->dma_addr = sg_dma_address(sgt->sgl);
579 npages = exynos_gem_obj->size >> PAGE_SHIFT;
580 exynos_gem_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
581 if (!exynos_gem_obj->pages) {
586 ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem_obj->pages, NULL,
591 if (sgt->nents == 1) {
592 /* always physically continuous memory if sgt->nents is 1. */
593 exynos_gem_obj->flags |= EXYNOS_BO_CONTIG;
596 * this case could be CONTIG or NONCONTIG type but for now
598 * TODO. we have to find a way that exporter can notify
599 * the type of its own buffer to importer.
601 exynos_gem_obj->flags |= EXYNOS_BO_NONCONTIG;
604 return &exynos_gem_obj->base;
607 drm_free_large(exynos_gem_obj->pages);
609 drm_gem_object_release(&exynos_gem_obj->base);
610 kfree(exynos_gem_obj);
614 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
619 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)