2 * NVIDIA Tegra DRM GEM helper functions
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
7 * Based on the GEM/CMA helpers
9 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/dma-buf.h>
17 #include <drm/tegra_drm.h>
22 static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
24 return container_of(bo, struct tegra_bo, base);
27 static void tegra_bo_put(struct host1x_bo *bo)
29 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
30 struct drm_device *drm = obj->gem.dev;
32 mutex_lock(&drm->struct_mutex);
33 drm_gem_object_unreference(&obj->gem);
34 mutex_unlock(&drm->struct_mutex);
37 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
39 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
44 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
48 static void *tegra_bo_mmap(struct host1x_bo *bo)
50 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
55 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
59 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
61 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
63 return obj->vaddr + page * PAGE_SIZE;
66 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
71 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
73 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
74 struct drm_device *drm = obj->gem.dev;
76 mutex_lock(&drm->struct_mutex);
77 drm_gem_object_reference(&obj->gem);
78 mutex_unlock(&drm->struct_mutex);
83 static const struct host1x_bo_ops tegra_bo_ops = {
87 .unpin = tegra_bo_unpin,
88 .mmap = tegra_bo_mmap,
89 .munmap = tegra_bo_munmap,
90 .kmap = tegra_bo_kmap,
91 .kunmap = tegra_bo_kunmap,
94 static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
96 dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
99 struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
105 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
107 return ERR_PTR(-ENOMEM);
109 host1x_bo_init(&bo->base, &tegra_bo_ops);
110 size = round_up(size, PAGE_SIZE);
112 bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
113 GFP_KERNEL | __GFP_NOWARN);
115 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
121 err = drm_gem_object_init(drm, &bo->gem, size);
125 err = drm_gem_create_mmap_offset(&bo->gem);
129 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
130 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
132 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
133 bo->flags |= TEGRA_BO_BOTTOM_UP;
138 drm_gem_object_release(&bo->gem);
140 tegra_bo_destroy(drm, bo);
147 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
148 struct drm_device *drm,
151 unsigned int *handle)
156 bo = tegra_bo_create(drm, size, flags);
160 ret = drm_gem_handle_create(file, &bo->gem, handle);
164 drm_gem_object_unreference_unlocked(&bo->gem);
169 tegra_bo_free_object(&bo->gem);
173 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
176 struct dma_buf_attachment *attach;
181 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
183 return ERR_PTR(-ENOMEM);
185 host1x_bo_init(&bo->base, &tegra_bo_ops);
186 size = round_up(buf->size, PAGE_SIZE);
188 err = drm_gem_object_init(drm, &bo->gem, size);
192 err = drm_gem_create_mmap_offset(&bo->gem);
196 attach = dma_buf_attach(buf, drm->dev);
197 if (IS_ERR(attach)) {
198 err = PTR_ERR(attach);
204 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
210 if (IS_ERR(bo->sgt)) {
211 err = PTR_ERR(bo->sgt);
215 if (bo->sgt->nents > 1) {
220 bo->paddr = sg_dma_address(bo->sgt->sgl);
221 bo->gem.import_attach = attach;
226 if (!IS_ERR_OR_NULL(bo->sgt))
227 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
229 dma_buf_detach(buf, attach);
232 drm_gem_free_mmap_offset(&bo->gem);
234 drm_gem_object_release(&bo->gem);
241 void tegra_bo_free_object(struct drm_gem_object *gem)
243 struct tegra_bo *bo = to_tegra_bo(gem);
245 if (gem->import_attach) {
246 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
248 drm_prime_gem_destroy(gem, NULL);
250 tegra_bo_destroy(gem->dev, bo);
253 drm_gem_free_mmap_offset(gem);
254 drm_gem_object_release(gem);
259 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
260 struct drm_mode_create_dumb *args)
262 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
263 struct tegra_drm *tegra = drm->dev_private;
266 min_pitch = round_up(min_pitch, tegra->pitch_align);
267 if (args->pitch < min_pitch)
268 args->pitch = min_pitch;
270 if (args->size < args->pitch * args->height)
271 args->size = args->pitch * args->height;
273 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
281 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
282 uint32_t handle, uint64_t *offset)
284 struct drm_gem_object *gem;
287 mutex_lock(&drm->struct_mutex);
289 gem = drm_gem_object_lookup(drm, file, handle);
291 dev_err(drm->dev, "failed to lookup GEM object\n");
292 mutex_unlock(&drm->struct_mutex);
296 bo = to_tegra_bo(gem);
298 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
300 drm_gem_object_unreference(gem);
302 mutex_unlock(&drm->struct_mutex);
307 const struct vm_operations_struct tegra_bo_vm_ops = {
308 .open = drm_gem_vm_open,
309 .close = drm_gem_vm_close,
312 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
314 struct drm_gem_object *gem;
318 ret = drm_gem_mmap(file, vma);
322 gem = vma->vm_private_data;
323 bo = to_tegra_bo(gem);
325 ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
326 vma->vm_end - vma->vm_start, vma->vm_page_prot);
328 drm_gem_vm_close(vma);
333 static struct sg_table *
334 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
335 enum dma_data_direction dir)
337 struct drm_gem_object *gem = attach->dmabuf->priv;
338 struct tegra_bo *bo = to_tegra_bo(gem);
339 struct sg_table *sgt;
341 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
345 if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
350 sg_dma_address(sgt->sgl) = bo->paddr;
351 sg_dma_len(sgt->sgl) = gem->size;
356 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
357 struct sg_table *sgt,
358 enum dma_data_direction dir)
364 static void tegra_gem_prime_release(struct dma_buf *buf)
366 drm_gem_dmabuf_release(buf);
369 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
375 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
381 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
386 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
391 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
396 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
398 struct drm_gem_object *gem = buf->priv;
399 struct tegra_bo *bo = to_tegra_bo(gem);
404 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
408 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
409 .map_dma_buf = tegra_gem_prime_map_dma_buf,
410 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
411 .release = tegra_gem_prime_release,
412 .kmap_atomic = tegra_gem_prime_kmap_atomic,
413 .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
414 .kmap = tegra_gem_prime_kmap,
415 .kunmap = tegra_gem_prime_kunmap,
416 .mmap = tegra_gem_prime_mmap,
417 .vmap = tegra_gem_prime_vmap,
418 .vunmap = tegra_gem_prime_vunmap,
421 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
422 struct drm_gem_object *gem,
425 return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
429 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
434 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
435 struct drm_gem_object *gem = buf->priv;
437 if (gem->dev == drm) {
438 drm_gem_object_reference(gem);
443 bo = tegra_bo_import(drm, buf);