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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
- * Author: Rob Clark <rob.clark@linaro.org>
- */
- #include <linux/dma-buf.h>
- #include <linux/highmem.h>
- #include <drm/drm_prime.h>
- #include "omap_drv.h"
- /* -----------------------------------------------------------------------------
- * DMABUF Export
- */
- static struct sg_table *omap_gem_map_dma_buf(
- struct dma_buf_attachment *attachment,
- enum dma_data_direction dir)
- {
- struct drm_gem_object *obj = attachment->dmabuf->priv;
- struct sg_table *sg;
- dma_addr_t dma_addr;
- int ret;
- sg = kzalloc(sizeof(*sg), GFP_KERNEL);
- if (!sg)
- return ERR_PTR(-ENOMEM);
- /* camera, etc, need physically contiguous.. but we need a
- * better way to know this..
- */
- ret = omap_gem_pin(obj, &dma_addr);
- if (ret)
- goto out;
- ret = sg_alloc_table(sg, 1, GFP_KERNEL);
- if (ret)
- goto out;
- sg_init_table(sg->sgl, 1);
- sg_dma_len(sg->sgl) = obj->size;
- sg_set_page(sg->sgl, pfn_to_page(PFN_DOWN(dma_addr)), obj->size, 0);
- sg_dma_address(sg->sgl) = dma_addr;
- /* this must be after omap_gem_pin() to ensure we have pages attached */
- omap_gem_dma_sync_buffer(obj, dir);
- return sg;
- out:
- kfree(sg);
- return ERR_PTR(ret);
- }
- static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
- struct sg_table *sg, enum dma_data_direction dir)
- {
- struct drm_gem_object *obj = attachment->dmabuf->priv;
- omap_gem_unpin(obj);
- sg_free_table(sg);
- kfree(sg);
- }
- static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
- enum dma_data_direction dir)
- {
- struct drm_gem_object *obj = buffer->priv;
- struct page **pages;
- if (omap_gem_flags(obj) & OMAP_BO_TILED_MASK) {
- /* TODO we would need to pin at least part of the buffer to
- * get de-tiled view. For now just reject it.
- */
- return -ENOMEM;
- }
- /* make sure we have the pages: */
- return omap_gem_get_pages(obj, &pages, true);
- }
- static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
- enum dma_data_direction dir)
- {
- struct drm_gem_object *obj = buffer->priv;
- omap_gem_put_pages(obj);
- return 0;
- }
- static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
- struct vm_area_struct *vma)
- {
- struct drm_gem_object *obj = buffer->priv;
- int ret = 0;
- ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma);
- if (ret < 0)
- return ret;
- return omap_gem_mmap_obj(obj, vma);
- }
- static const struct dma_buf_ops omap_dmabuf_ops = {
- .map_dma_buf = omap_gem_map_dma_buf,
- .unmap_dma_buf = omap_gem_unmap_dma_buf,
- .release = drm_gem_dmabuf_release,
- .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access,
- .end_cpu_access = omap_gem_dmabuf_end_cpu_access,
- .mmap = omap_gem_dmabuf_mmap,
- };
- struct dma_buf *omap_gem_prime_export(struct drm_gem_object *obj, int flags)
- {
- DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
- exp_info.ops = &omap_dmabuf_ops;
- exp_info.size = obj->size;
- exp_info.flags = flags;
- exp_info.priv = obj;
- return drm_gem_dmabuf_export(obj->dev, &exp_info);
- }
- /* -----------------------------------------------------------------------------
- * DMABUF Import
- */
- struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
- struct dma_buf *dma_buf)
- {
- struct dma_buf_attachment *attach;
- struct drm_gem_object *obj;
- struct sg_table *sgt;
- int ret;
- if (dma_buf->ops == &omap_dmabuf_ops) {
- obj = dma_buf->priv;
- if (obj->dev == dev) {
- /*
- * Importing dmabuf exported from out own gem increases
- * refcount on gem itself instead of f_count of dmabuf.
- */
- drm_gem_object_get(obj);
- return obj;
- }
- }
- attach = dma_buf_attach(dma_buf, dev->dev);
- if (IS_ERR(attach))
- return ERR_CAST(attach);
- get_dma_buf(dma_buf);
- sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
- if (IS_ERR(sgt)) {
- ret = PTR_ERR(sgt);
- goto fail_detach;
- }
- obj = omap_gem_new_dmabuf(dev, dma_buf->size, sgt);
- if (IS_ERR(obj)) {
- ret = PTR_ERR(obj);
- goto fail_unmap;
- }
- obj->import_attach = attach;
- return obj;
- fail_unmap:
- dma_buf_unmap_attachment(attach, sgt, DMA_TO_DEVICE);
- fail_detach:
- dma_buf_detach(dma_buf, attach);
- dma_buf_put(dma_buf);
- return ERR_PTR(ret);
- }
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