![Thierry Reding](/assets/img/avatar_default.png)
Implement very basic PRIME support. This currently only works with buffers that are contiguous in memory and will refuse to import any physically non-contiguous buffers. Signed-off-by: Thierry Reding <treding@nvidia.com>
436 lines
9.2 KiB
C
436 lines
9.2 KiB
C
/*
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* NVIDIA Tegra DRM GEM helper functions
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*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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* Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
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*
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* Based on the GEM/CMA helpers
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/dma-buf.h>
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#include <drm/tegra_drm.h>
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#include "gem.h"
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static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
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{
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return container_of(bo, struct tegra_bo, base);
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}
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static void tegra_bo_put(struct host1x_bo *bo)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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struct drm_device *drm = obj->gem.dev;
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mutex_lock(&drm->struct_mutex);
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drm_gem_object_unreference(&obj->gem);
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mutex_unlock(&drm->struct_mutex);
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}
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static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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return obj->paddr;
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}
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static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
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{
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}
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static void *tegra_bo_mmap(struct host1x_bo *bo)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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return obj->vaddr;
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}
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static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
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{
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}
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static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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return obj->vaddr + page * PAGE_SIZE;
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}
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static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
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void *addr)
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{
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}
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static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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struct drm_device *drm = obj->gem.dev;
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mutex_lock(&drm->struct_mutex);
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drm_gem_object_reference(&obj->gem);
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mutex_unlock(&drm->struct_mutex);
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return bo;
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}
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static const struct host1x_bo_ops tegra_bo_ops = {
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.get = tegra_bo_get,
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.put = tegra_bo_put,
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.pin = tegra_bo_pin,
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.unpin = tegra_bo_unpin,
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.mmap = tegra_bo_mmap,
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.munmap = tegra_bo_munmap,
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.kmap = tegra_bo_kmap,
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.kunmap = tegra_bo_kunmap,
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};
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static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
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{
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dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
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}
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struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
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unsigned long flags)
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{
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struct tegra_bo *bo;
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int err;
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bo = kzalloc(sizeof(*bo), GFP_KERNEL);
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if (!bo)
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return ERR_PTR(-ENOMEM);
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host1x_bo_init(&bo->base, &tegra_bo_ops);
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size = round_up(size, PAGE_SIZE);
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bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
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GFP_KERNEL | __GFP_NOWARN);
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if (!bo->vaddr) {
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dev_err(drm->dev, "failed to allocate buffer with size %u\n",
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size);
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err = -ENOMEM;
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goto err_dma;
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}
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err = drm_gem_object_init(drm, &bo->gem, size);
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if (err)
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goto err_init;
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err = drm_gem_create_mmap_offset(&bo->gem);
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if (err)
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goto err_mmap;
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if (flags & DRM_TEGRA_GEM_CREATE_TILED)
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bo->flags |= TEGRA_BO_TILED;
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if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
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bo->flags |= TEGRA_BO_BOTTOM_UP;
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return bo;
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err_mmap:
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drm_gem_object_release(&bo->gem);
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err_init:
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tegra_bo_destroy(drm, bo);
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err_dma:
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kfree(bo);
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return ERR_PTR(err);
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}
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struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
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struct drm_device *drm,
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unsigned int size,
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unsigned long flags,
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unsigned int *handle)
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{
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struct tegra_bo *bo;
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int ret;
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bo = tegra_bo_create(drm, size, flags);
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if (IS_ERR(bo))
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return bo;
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ret = drm_gem_handle_create(file, &bo->gem, handle);
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if (ret)
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goto err;
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drm_gem_object_unreference_unlocked(&bo->gem);
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return bo;
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err:
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tegra_bo_free_object(&bo->gem);
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return ERR_PTR(ret);
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}
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struct tegra_bo *tegra_bo_import(struct drm_device *drm, struct dma_buf *buf)
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{
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struct dma_buf_attachment *attach;
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struct tegra_bo *bo;
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ssize_t size;
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int err;
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bo = kzalloc(sizeof(*bo), GFP_KERNEL);
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if (!bo)
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return ERR_PTR(-ENOMEM);
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host1x_bo_init(&bo->base, &tegra_bo_ops);
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size = round_up(buf->size, PAGE_SIZE);
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err = drm_gem_object_init(drm, &bo->gem, size);
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if (err < 0)
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goto free;
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err = drm_gem_create_mmap_offset(&bo->gem);
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if (err < 0)
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goto release;
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attach = dma_buf_attach(buf, drm->dev);
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if (IS_ERR(attach)) {
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err = PTR_ERR(attach);
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goto free_mmap;
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}
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get_dma_buf(buf);
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bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
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if (!bo->sgt) {
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err = -ENOMEM;
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goto detach;
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}
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if (IS_ERR(bo->sgt)) {
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err = PTR_ERR(bo->sgt);
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goto detach;
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}
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if (bo->sgt->nents > 1) {
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err = -EINVAL;
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goto detach;
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}
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bo->paddr = sg_dma_address(bo->sgt->sgl);
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bo->gem.import_attach = attach;
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return bo;
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detach:
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if (!IS_ERR_OR_NULL(bo->sgt))
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dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
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dma_buf_detach(buf, attach);
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dma_buf_put(buf);
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free_mmap:
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drm_gem_free_mmap_offset(&bo->gem);
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release:
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drm_gem_object_release(&bo->gem);
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free:
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kfree(bo);
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return ERR_PTR(err);
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}
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void tegra_bo_free_object(struct drm_gem_object *gem)
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{
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struct tegra_bo *bo = to_tegra_bo(gem);
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if (gem->import_attach) {
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dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
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DMA_TO_DEVICE);
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drm_prime_gem_destroy(gem, NULL);
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} else {
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tegra_bo_destroy(gem->dev, bo);
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}
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drm_gem_free_mmap_offset(gem);
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drm_gem_object_release(gem);
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kfree(bo);
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}
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int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
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struct drm_mode_create_dumb *args)
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{
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int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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struct tegra_bo *bo;
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if (args->pitch < min_pitch)
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args->pitch = min_pitch;
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if (args->size < args->pitch * args->height)
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args->size = args->pitch * args->height;
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bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
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&args->handle);
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if (IS_ERR(bo))
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return PTR_ERR(bo);
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return 0;
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}
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int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
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uint32_t handle, uint64_t *offset)
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{
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struct drm_gem_object *gem;
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struct tegra_bo *bo;
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mutex_lock(&drm->struct_mutex);
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gem = drm_gem_object_lookup(drm, file, handle);
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if (!gem) {
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dev_err(drm->dev, "failed to lookup GEM object\n");
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mutex_unlock(&drm->struct_mutex);
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return -EINVAL;
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}
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bo = to_tegra_bo(gem);
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*offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
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drm_gem_object_unreference(gem);
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mutex_unlock(&drm->struct_mutex);
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return 0;
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}
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const struct vm_operations_struct tegra_bo_vm_ops = {
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct drm_gem_object *gem;
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struct tegra_bo *bo;
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int ret;
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ret = drm_gem_mmap(file, vma);
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if (ret)
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return ret;
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gem = vma->vm_private_data;
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bo = to_tegra_bo(gem);
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ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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if (ret)
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drm_gem_vm_close(vma);
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return ret;
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}
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static struct sg_table *
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tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
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enum dma_data_direction dir)
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{
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struct drm_gem_object *gem = attach->dmabuf->priv;
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struct tegra_bo *bo = to_tegra_bo(gem);
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struct sg_table *sgt;
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sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
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if (!sgt)
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return NULL;
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if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
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kfree(sgt);
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return NULL;
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}
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sg_dma_address(sgt->sgl) = bo->paddr;
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sg_dma_len(sgt->sgl) = gem->size;
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return sgt;
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}
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static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
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struct sg_table *sgt,
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enum dma_data_direction dir)
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{
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sg_free_table(sgt);
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kfree(sgt);
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}
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static void tegra_gem_prime_release(struct dma_buf *buf)
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{
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drm_gem_dmabuf_release(buf);
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}
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static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
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unsigned long page)
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{
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return NULL;
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}
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static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
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unsigned long page,
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void *addr)
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{
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}
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static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
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{
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return NULL;
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}
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static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
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void *addr)
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{
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}
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static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
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{
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return -EINVAL;
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}
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static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
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.map_dma_buf = tegra_gem_prime_map_dma_buf,
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.unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
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.release = tegra_gem_prime_release,
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.kmap_atomic = tegra_gem_prime_kmap_atomic,
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.kunmap_atomic = tegra_gem_prime_kunmap_atomic,
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.kmap = tegra_gem_prime_kmap,
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.kunmap = tegra_gem_prime_kunmap,
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.mmap = tegra_gem_prime_mmap,
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};
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struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
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struct drm_gem_object *gem,
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int flags)
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{
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return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
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flags);
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}
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struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
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struct dma_buf *buf)
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{
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struct tegra_bo *bo;
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if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
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struct drm_gem_object *gem = buf->priv;
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if (gem->dev == drm) {
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drm_gem_object_reference(gem);
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return gem;
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}
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}
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bo = tegra_bo_import(drm, buf);
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if (IS_ERR(bo))
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return ERR_CAST(bo);
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return &bo->gem;
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}
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