| /* |
| * NVIDIA Tegra DRM GEM helper functions |
| * |
| * Copyright (C) 2012 Sascha Hauer, Pengutronix |
| * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved. |
| * |
| * Based on the GEM/CMA helpers |
| * |
| * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/dma-buf.h> |
| #include <drm/tegra_drm.h> |
| |
| #include "gem.h" |
| |
| static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo) |
| { |
| return container_of(bo, struct tegra_bo, base); |
| } |
| |
| static void tegra_bo_put(struct host1x_bo *bo) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| struct drm_device *drm = obj->gem.dev; |
| |
| mutex_lock(&drm->struct_mutex); |
| drm_gem_object_unreference(&obj->gem); |
| mutex_unlock(&drm->struct_mutex); |
| } |
| |
| static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| |
| return obj->paddr; |
| } |
| |
| static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt) |
| { |
| } |
| |
| static void *tegra_bo_mmap(struct host1x_bo *bo) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| |
| return obj->vaddr; |
| } |
| |
| static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) |
| { |
| } |
| |
| static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| |
| return obj->vaddr + page * PAGE_SIZE; |
| } |
| |
| static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page, |
| void *addr) |
| { |
| } |
| |
| static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| struct drm_device *drm = obj->gem.dev; |
| |
| mutex_lock(&drm->struct_mutex); |
| drm_gem_object_reference(&obj->gem); |
| mutex_unlock(&drm->struct_mutex); |
| |
| return bo; |
| } |
| |
| static const struct host1x_bo_ops tegra_bo_ops = { |
| .get = tegra_bo_get, |
| .put = tegra_bo_put, |
| .pin = tegra_bo_pin, |
| .unpin = tegra_bo_unpin, |
| .mmap = tegra_bo_mmap, |
| .munmap = tegra_bo_munmap, |
| .kmap = tegra_bo_kmap, |
| .kunmap = tegra_bo_kunmap, |
| }; |
| |
| static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo) |
| { |
| dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr); |
| } |
| |
| struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size, |
| unsigned long flags) |
| { |
| struct tegra_bo *bo; |
| int err; |
| |
| bo = kzalloc(sizeof(*bo), GFP_KERNEL); |
| if (!bo) |
| return ERR_PTR(-ENOMEM); |
| |
| host1x_bo_init(&bo->base, &tegra_bo_ops); |
| size = round_up(size, PAGE_SIZE); |
| |
| bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr, |
| GFP_KERNEL | __GFP_NOWARN); |
| if (!bo->vaddr) { |
| dev_err(drm->dev, "failed to allocate buffer with size %u\n", |
| size); |
| err = -ENOMEM; |
| goto err_dma; |
| } |
| |
| err = drm_gem_object_init(drm, &bo->gem, size); |
| if (err) |
| goto err_init; |
| |
| err = drm_gem_create_mmap_offset(&bo->gem); |
| if (err) |
| goto err_mmap; |
| |
| if (flags & DRM_TEGRA_GEM_CREATE_TILED) |
| bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; |
| |
| if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) |
| bo->flags |= TEGRA_BO_BOTTOM_UP; |
| |
| return bo; |
| |
| err_mmap: |
| drm_gem_object_release(&bo->gem); |
| err_init: |
| tegra_bo_destroy(drm, bo); |
| err_dma: |
| kfree(bo); |
| |
| return ERR_PTR(err); |
| } |
| |
| struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, |
| struct drm_device *drm, |
| unsigned int size, |
| unsigned long flags, |
| unsigned int *handle) |
| { |
| struct tegra_bo *bo; |
| int ret; |
| |
| bo = tegra_bo_create(drm, size, flags); |
| if (IS_ERR(bo)) |
| return bo; |
| |
| ret = drm_gem_handle_create(file, &bo->gem, handle); |
| if (ret) |
| goto err; |
| |
| drm_gem_object_unreference_unlocked(&bo->gem); |
| |
| return bo; |
| |
| err: |
| tegra_bo_free_object(&bo->gem); |
| return ERR_PTR(ret); |
| } |
| |
| static struct tegra_bo *tegra_bo_import(struct drm_device *drm, |
| struct dma_buf *buf) |
| { |
| struct dma_buf_attachment *attach; |
| struct tegra_bo *bo; |
| ssize_t size; |
| int err; |
| |
| bo = kzalloc(sizeof(*bo), GFP_KERNEL); |
| if (!bo) |
| return ERR_PTR(-ENOMEM); |
| |
| host1x_bo_init(&bo->base, &tegra_bo_ops); |
| size = round_up(buf->size, PAGE_SIZE); |
| |
| err = drm_gem_object_init(drm, &bo->gem, size); |
| if (err < 0) |
| goto free; |
| |
| err = drm_gem_create_mmap_offset(&bo->gem); |
| if (err < 0) |
| goto release; |
| |
| attach = dma_buf_attach(buf, drm->dev); |
| if (IS_ERR(attach)) { |
| err = PTR_ERR(attach); |
| goto free_mmap; |
| } |
| |
| get_dma_buf(buf); |
| |
| bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE); |
| if (!bo->sgt) { |
| err = -ENOMEM; |
| goto detach; |
| } |
| |
| if (IS_ERR(bo->sgt)) { |
| err = PTR_ERR(bo->sgt); |
| goto detach; |
| } |
| |
| if (bo->sgt->nents > 1) { |
| err = -EINVAL; |
| goto detach; |
| } |
| |
| bo->paddr = sg_dma_address(bo->sgt->sgl); |
| bo->gem.import_attach = attach; |
| |
| return bo; |
| |
| detach: |
| if (!IS_ERR_OR_NULL(bo->sgt)) |
| dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE); |
| |
| dma_buf_detach(buf, attach); |
| dma_buf_put(buf); |
| free_mmap: |
| drm_gem_free_mmap_offset(&bo->gem); |
| release: |
| drm_gem_object_release(&bo->gem); |
| free: |
| kfree(bo); |
| |
| return ERR_PTR(err); |
| } |
| |
| void tegra_bo_free_object(struct drm_gem_object *gem) |
| { |
| struct tegra_bo *bo = to_tegra_bo(gem); |
| |
| if (gem->import_attach) { |
| dma_buf_unmap_attachment(gem->import_attach, bo->sgt, |
| DMA_TO_DEVICE); |
| drm_prime_gem_destroy(gem, NULL); |
| } else { |
| tegra_bo_destroy(gem->dev, bo); |
| } |
| |
| drm_gem_free_mmap_offset(gem); |
| drm_gem_object_release(gem); |
| |
| kfree(bo); |
| } |
| |
| int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, |
| struct drm_mode_create_dumb *args) |
| { |
| int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); |
| struct tegra_bo *bo; |
| |
| if (args->pitch < min_pitch) |
| args->pitch = min_pitch; |
| |
| if (args->size < args->pitch * args->height) |
| args->size = args->pitch * args->height; |
| |
| bo = tegra_bo_create_with_handle(file, drm, args->size, 0, |
| &args->handle); |
| if (IS_ERR(bo)) |
| return PTR_ERR(bo); |
| |
| return 0; |
| } |
| |
| int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm, |
| uint32_t handle, uint64_t *offset) |
| { |
| struct drm_gem_object *gem; |
| struct tegra_bo *bo; |
| |
| mutex_lock(&drm->struct_mutex); |
| |
| gem = drm_gem_object_lookup(drm, file, handle); |
| if (!gem) { |
| dev_err(drm->dev, "failed to lookup GEM object\n"); |
| mutex_unlock(&drm->struct_mutex); |
| return -EINVAL; |
| } |
| |
| bo = to_tegra_bo(gem); |
| |
| *offset = drm_vma_node_offset_addr(&bo->gem.vma_node); |
| |
| drm_gem_object_unreference(gem); |
| |
| mutex_unlock(&drm->struct_mutex); |
| |
| return 0; |
| } |
| |
| const struct vm_operations_struct tegra_bo_vm_ops = { |
| .open = drm_gem_vm_open, |
| .close = drm_gem_vm_close, |
| }; |
| |
| int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| struct drm_gem_object *gem; |
| struct tegra_bo *bo; |
| int ret; |
| |
| ret = drm_gem_mmap(file, vma); |
| if (ret) |
| return ret; |
| |
| gem = vma->vm_private_data; |
| bo = to_tegra_bo(gem); |
| |
| ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT, |
| vma->vm_end - vma->vm_start, vma->vm_page_prot); |
| if (ret) |
| drm_gem_vm_close(vma); |
| |
| return ret; |
| } |
| |
| static struct sg_table * |
| tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, |
| enum dma_data_direction dir) |
| { |
| struct drm_gem_object *gem = attach->dmabuf->priv; |
| struct tegra_bo *bo = to_tegra_bo(gem); |
| struct sg_table *sgt; |
| |
| sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); |
| if (!sgt) |
| return NULL; |
| |
| if (sg_alloc_table(sgt, 1, GFP_KERNEL)) { |
| kfree(sgt); |
| return NULL; |
| } |
| |
| sg_dma_address(sgt->sgl) = bo->paddr; |
| sg_dma_len(sgt->sgl) = gem->size; |
| |
| return sgt; |
| } |
| |
| static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, |
| struct sg_table *sgt, |
| enum dma_data_direction dir) |
| { |
| sg_free_table(sgt); |
| kfree(sgt); |
| } |
| |
| static void tegra_gem_prime_release(struct dma_buf *buf) |
| { |
| drm_gem_dmabuf_release(buf); |
| } |
| |
| static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf, |
| unsigned long page) |
| { |
| return NULL; |
| } |
| |
| static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf, |
| unsigned long page, |
| void *addr) |
| { |
| } |
| |
| static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page) |
| { |
| return NULL; |
| } |
| |
| static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page, |
| void *addr) |
| { |
| } |
| |
| static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) |
| { |
| return -EINVAL; |
| } |
| |
| static void *tegra_gem_prime_vmap(struct dma_buf *buf) |
| { |
| struct drm_gem_object *gem = buf->priv; |
| struct tegra_bo *bo = to_tegra_bo(gem); |
| |
| return bo->vaddr; |
| } |
| |
| static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr) |
| { |
| } |
| |
| static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { |
| .map_dma_buf = tegra_gem_prime_map_dma_buf, |
| .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, |
| .release = tegra_gem_prime_release, |
| .kmap_atomic = tegra_gem_prime_kmap_atomic, |
| .kunmap_atomic = tegra_gem_prime_kunmap_atomic, |
| .kmap = tegra_gem_prime_kmap, |
| .kunmap = tegra_gem_prime_kunmap, |
| .mmap = tegra_gem_prime_mmap, |
| .vmap = tegra_gem_prime_vmap, |
| .vunmap = tegra_gem_prime_vunmap, |
| }; |
| |
| struct dma_buf *tegra_gem_prime_export(struct drm_device *drm, |
| struct drm_gem_object *gem, |
| int flags) |
| { |
| return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size, |
| flags); |
| } |
| |
| struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, |
| struct dma_buf *buf) |
| { |
| struct tegra_bo *bo; |
| |
| if (buf->ops == &tegra_gem_prime_dmabuf_ops) { |
| struct drm_gem_object *gem = buf->priv; |
| |
| if (gem->dev == drm) { |
| drm_gem_object_reference(gem); |
| return gem; |
| } |
| } |
| |
| bo = tegra_bo_import(drm, buf); |
| if (IS_ERR(bo)) |
| return ERR_CAST(bo); |
| |
| return &bo->gem; |
| } |