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>
21 static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
23 return container_of(bo, struct tegra_bo, base);
26 static void tegra_bo_put(struct host1x_bo *bo)
28 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
29 struct drm_device *drm = obj->gem.dev;
31 mutex_lock(&drm->struct_mutex);
32 drm_gem_object_unreference(&obj->gem);
33 mutex_unlock(&drm->struct_mutex);
36 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
38 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
43 static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
47 static void *tegra_bo_mmap(struct host1x_bo *bo)
49 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
54 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
58 static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
60 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
62 return obj->vaddr + page * PAGE_SIZE;
65 static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
70 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
72 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
73 struct drm_device *drm = obj->gem.dev;
75 mutex_lock(&drm->struct_mutex);
76 drm_gem_object_reference(&obj->gem);
77 mutex_unlock(&drm->struct_mutex);
82 static const struct host1x_bo_ops tegra_bo_ops = {
86 .unpin = tegra_bo_unpin,
87 .mmap = tegra_bo_mmap,
88 .munmap = tegra_bo_munmap,
89 .kmap = tegra_bo_kmap,
90 .kunmap = tegra_bo_kunmap,
93 static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
95 dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
98 struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
104 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
106 return ERR_PTR(-ENOMEM);
108 host1x_bo_init(&bo->base, &tegra_bo_ops);
109 size = round_up(size, PAGE_SIZE);
111 bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
112 GFP_KERNEL | __GFP_NOWARN);
114 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
120 err = drm_gem_object_init(drm, &bo->gem, size);
124 err = drm_gem_create_mmap_offset(&bo->gem);
128 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
129 bo->flags |= TEGRA_BO_TILED;
131 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
132 bo->flags |= TEGRA_BO_BOTTOM_UP;
137 drm_gem_object_release(&bo->gem);
139 tegra_bo_destroy(drm, bo);
146 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
147 struct drm_device *drm,
150 unsigned int *handle)
155 bo = tegra_bo_create(drm, size, flags);
159 ret = drm_gem_handle_create(file, &bo->gem, handle);
163 drm_gem_object_unreference_unlocked(&bo->gem);
168 tegra_bo_free_object(&bo->gem);
172 struct tegra_bo *tegra_bo_import(struct drm_device *drm, struct dma_buf *buf)
174 struct dma_buf_attachment *attach;
179 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
181 return ERR_PTR(-ENOMEM);
183 host1x_bo_init(&bo->base, &tegra_bo_ops);
184 size = round_up(buf->size, PAGE_SIZE);
186 err = drm_gem_object_init(drm, &bo->gem, size);
190 err = drm_gem_create_mmap_offset(&bo->gem);
194 attach = dma_buf_attach(buf, drm->dev);
195 if (IS_ERR(attach)) {
196 err = PTR_ERR(attach);
202 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
208 if (IS_ERR(bo->sgt)) {
209 err = PTR_ERR(bo->sgt);
213 if (bo->sgt->nents > 1) {
218 bo->paddr = sg_dma_address(bo->sgt->sgl);
219 bo->gem.import_attach = attach;
224 if (!IS_ERR_OR_NULL(bo->sgt))
225 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
227 dma_buf_detach(buf, attach);
230 drm_gem_free_mmap_offset(&bo->gem);
232 drm_gem_object_release(&bo->gem);
239 void tegra_bo_free_object(struct drm_gem_object *gem)
241 struct tegra_bo *bo = to_tegra_bo(gem);
243 if (gem->import_attach) {
244 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
246 drm_prime_gem_destroy(gem, NULL);
248 tegra_bo_destroy(gem->dev, bo);
251 drm_gem_free_mmap_offset(gem);
252 drm_gem_object_release(gem);
257 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
258 struct drm_mode_create_dumb *args)
260 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
263 if (args->pitch < min_pitch)
264 args->pitch = min_pitch;
266 if (args->size < args->pitch * args->height)
267 args->size = args->pitch * args->height;
269 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
277 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
278 uint32_t handle, uint64_t *offset)
280 struct drm_gem_object *gem;
283 mutex_lock(&drm->struct_mutex);
285 gem = drm_gem_object_lookup(drm, file, handle);
287 dev_err(drm->dev, "failed to lookup GEM object\n");
288 mutex_unlock(&drm->struct_mutex);
292 bo = to_tegra_bo(gem);
294 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
296 drm_gem_object_unreference(gem);
298 mutex_unlock(&drm->struct_mutex);
303 const struct vm_operations_struct tegra_bo_vm_ops = {
304 .open = drm_gem_vm_open,
305 .close = drm_gem_vm_close,
308 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
310 struct drm_gem_object *gem;
314 ret = drm_gem_mmap(file, vma);
318 gem = vma->vm_private_data;
319 bo = to_tegra_bo(gem);
321 ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
322 vma->vm_end - vma->vm_start, vma->vm_page_prot);
324 drm_gem_vm_close(vma);
329 static struct sg_table *
330 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
331 enum dma_data_direction dir)
333 struct drm_gem_object *gem = attach->dmabuf->priv;
334 struct tegra_bo *bo = to_tegra_bo(gem);
335 struct sg_table *sgt;
337 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
341 if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
346 sg_dma_address(sgt->sgl) = bo->paddr;
347 sg_dma_len(sgt->sgl) = gem->size;
352 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
353 struct sg_table *sgt,
354 enum dma_data_direction dir)
360 static void tegra_gem_prime_release(struct dma_buf *buf)
362 drm_gem_dmabuf_release(buf);
365 static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
371 static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
377 static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
382 static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
387 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
392 static void *tegra_gem_prime_vmap(struct dma_buf *buf)
394 struct drm_gem_object *gem = buf->priv;
395 struct tegra_bo *bo = to_tegra_bo(gem);
400 static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
404 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
405 .map_dma_buf = tegra_gem_prime_map_dma_buf,
406 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
407 .release = tegra_gem_prime_release,
408 .kmap_atomic = tegra_gem_prime_kmap_atomic,
409 .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
410 .kmap = tegra_gem_prime_kmap,
411 .kunmap = tegra_gem_prime_kunmap,
412 .mmap = tegra_gem_prime_mmap,
413 .vmap = tegra_gem_prime_vmap,
414 .vunmap = tegra_gem_prime_vunmap,
417 struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
418 struct drm_gem_object *gem,
421 return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
425 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
430 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
431 struct drm_gem_object *gem = buf->priv;
433 if (gem->dev == drm) {
434 drm_gem_object_reference(gem);
439 bo = tegra_bo_import(drm, buf);