227 lines
5.6 KiB
C
227 lines
5.6 KiB
C
/*
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* drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
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*
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* Copyright (C) 2011 Texas Instruments
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* Author: Rob Clark <rob.clark@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/dma-buf.h>
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#include "omap_drv.h"
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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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dma_addr_t dma_addr;
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int ret;
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sg = kzalloc(sizeof(*sg), GFP_KERNEL);
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if (!sg)
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return ERR_PTR(-ENOMEM);
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/* camera, etc, need physically contiguous.. but we need a
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* better way to know this..
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*/
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ret = omap_gem_pin(obj, &dma_addr);
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if (ret)
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goto out;
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ret = sg_alloc_table(sg, 1, GFP_KERNEL);
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if (ret)
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goto out;
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sg_init_table(sg->sgl, 1);
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sg_dma_len(sg->sgl) = obj->size;
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sg_set_page(sg->sgl, pfn_to_page(PFN_DOWN(dma_addr)), obj->size, 0);
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sg_dma_address(sg->sgl) = dma_addr;
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/* this must be after omap_gem_pin() to ensure we have pages attached */
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omap_gem_dma_sync_buffer(obj, dir);
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return sg;
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out:
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kfree(sg);
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return ERR_PTR(ret);
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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_unpin(obj);
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sg_free_table(sg);
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kfree(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) {
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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 void *omap_gem_dmabuf_kmap_atomic(struct dma_buf *buffer,
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unsigned long page_num)
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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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omap_gem_get_pages(obj, &pages, false);
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omap_gem_cpu_sync_page(obj, page_num);
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return kmap_atomic(pages[page_num]);
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}
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static void omap_gem_dmabuf_kunmap_atomic(struct dma_buf *buffer,
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unsigned long page_num, void *addr)
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{
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kunmap_atomic(addr);
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}
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static void *omap_gem_dmabuf_kmap(struct dma_buf *buffer,
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unsigned long page_num)
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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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omap_gem_get_pages(obj, &pages, false);
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omap_gem_cpu_sync_page(obj, page_num);
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return kmap(pages[page_num]);
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}
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static void omap_gem_dmabuf_kunmap(struct dma_buf *buffer,
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unsigned long page_num, void *addr)
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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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omap_gem_get_pages(obj, &pages, false);
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kunmap(pages[page_num]);
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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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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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.map_atomic = omap_gem_dmabuf_kmap_atomic,
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.unmap_atomic = omap_gem_dmabuf_kunmap_atomic,
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.map = omap_gem_dmabuf_kmap,
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.unmap = omap_gem_dmabuf_kunmap,
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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_device *dev,
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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 = obj->size;
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exp_info.flags = flags;
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exp_info.priv = obj;
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return drm_gem_dmabuf_export(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_reference(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(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(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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