154 lines
3.5 KiB
C
154 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
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* Author: Rob Clark <rob.clark@linaro.org>
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*/
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#include <linux/dma-buf.h>
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#include <linux/highmem.h>
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#include <drm/drm_prime.h>
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#include "omap_drv.h"
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MODULE_IMPORT_NS(DMA_BUF);
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/* -----------------------------------------------------------------------------
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* DMABUF Export
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*/
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static struct sg_table *omap_gem_map_dma_buf(
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struct dma_buf_attachment *attachment,
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enum dma_data_direction dir)
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{
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struct drm_gem_object *obj = attachment->dmabuf->priv;
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struct sg_table *sg;
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sg = omap_gem_get_sg(obj, dir);
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if (IS_ERR(sg))
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return sg;
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return sg;
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}
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static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
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struct sg_table *sg, enum dma_data_direction dir)
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{
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struct drm_gem_object *obj = attachment->dmabuf->priv;
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omap_gem_put_sg(obj, sg);
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}
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static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
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enum dma_data_direction dir)
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{
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struct drm_gem_object *obj = buffer->priv;
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struct page **pages;
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if (omap_gem_flags(obj) & OMAP_BO_TILED_MASK) {
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/* TODO we would need to pin at least part of the buffer to
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* get de-tiled view. For now just reject it.
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*/
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return -ENOMEM;
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}
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/* make sure we have the pages: */
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return omap_gem_get_pages(obj, &pages, true);
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}
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static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
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enum dma_data_direction dir)
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{
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struct drm_gem_object *obj = buffer->priv;
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omap_gem_put_pages(obj);
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return 0;
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}
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static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
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struct vm_area_struct *vma)
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{
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struct drm_gem_object *obj = buffer->priv;
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int ret = 0;
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dma_resv_assert_held(buffer->resv);
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ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma);
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if (ret < 0)
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return ret;
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return omap_gem_mmap_obj(obj, vma);
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}
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static const struct dma_buf_ops omap_dmabuf_ops = {
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.map_dma_buf = omap_gem_map_dma_buf,
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.unmap_dma_buf = omap_gem_unmap_dma_buf,
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.release = drm_gem_dmabuf_release,
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.begin_cpu_access = omap_gem_dmabuf_begin_cpu_access,
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.end_cpu_access = omap_gem_dmabuf_end_cpu_access,
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.mmap = omap_gem_dmabuf_mmap,
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};
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struct dma_buf *omap_gem_prime_export(struct drm_gem_object *obj, int flags)
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{
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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exp_info.ops = &omap_dmabuf_ops;
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exp_info.size = omap_gem_mmap_size(obj);
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exp_info.flags = flags;
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exp_info.priv = obj;
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exp_info.resv = obj->resv;
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return drm_gem_dmabuf_export(obj->dev, &exp_info);
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}
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/* -----------------------------------------------------------------------------
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* DMABUF Import
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*/
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struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
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struct dma_buf *dma_buf)
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{
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struct dma_buf_attachment *attach;
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struct drm_gem_object *obj;
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struct sg_table *sgt;
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int ret;
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if (dma_buf->ops == &omap_dmabuf_ops) {
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obj = dma_buf->priv;
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if (obj->dev == dev) {
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/*
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* Importing dmabuf exported from out own gem increases
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* refcount on gem itself instead of f_count of dmabuf.
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*/
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drm_gem_object_get(obj);
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return obj;
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}
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}
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attach = dma_buf_attach(dma_buf, dev->dev);
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if (IS_ERR(attach))
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return ERR_CAST(attach);
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get_dma_buf(dma_buf);
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sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE);
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if (IS_ERR(sgt)) {
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ret = PTR_ERR(sgt);
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goto fail_detach;
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}
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obj = omap_gem_new_dmabuf(dev, dma_buf->size, sgt);
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if (IS_ERR(obj)) {
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ret = PTR_ERR(obj);
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goto fail_unmap;
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}
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obj->import_attach = attach;
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return obj;
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fail_unmap:
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dma_buf_unmap_attachment_unlocked(attach, sgt, DMA_TO_DEVICE);
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fail_detach:
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dma_buf_detach(dma_buf, attach);
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dma_buf_put(dma_buf);
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return ERR_PTR(ret);
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}
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