+++ /dev/null
-/* exynos_drm_dmabuf.c
- *
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- * Author: Inki Dae <inki.dae@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
-
-#include <drm/drmP.h>
-#include <drm/exynos_drm.h>
-#include "exynos_drm_dmabuf.h"
-#include "exynos_drm_drv.h"
-#include "exynos_drm_gem.h"
-
-#include <linux/dma-buf.h>
-
-struct exynos_drm_dmabuf_attachment {
- struct sg_table sgt;
- enum dma_data_direction dir;
- bool is_mapped;
-};
-
-static struct exynos_drm_gem_obj *dma_buf_to_obj(struct dma_buf *buf)
-{
- return to_exynos_gem_obj(buf->priv);
-}
-
-static int exynos_gem_attach_dma_buf(struct dma_buf *dmabuf,
- struct device *dev,
- struct dma_buf_attachment *attach)
-{
- struct exynos_drm_dmabuf_attachment *exynos_attach;
-
- exynos_attach = kzalloc(sizeof(*exynos_attach), GFP_KERNEL);
- if (!exynos_attach)
- return -ENOMEM;
-
- exynos_attach->dir = DMA_NONE;
- attach->priv = exynos_attach;
-
- return 0;
-}
-
-static void exynos_gem_detach_dma_buf(struct dma_buf *dmabuf,
- struct dma_buf_attachment *attach)
-{
- struct exynos_drm_dmabuf_attachment *exynos_attach = attach->priv;
- struct sg_table *sgt;
-
- if (!exynos_attach)
- return;
-
- sgt = &exynos_attach->sgt;
-
- if (exynos_attach->dir != DMA_NONE)
- dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
- exynos_attach->dir);
-
- sg_free_table(sgt);
- kfree(exynos_attach);
- attach->priv = NULL;
-}
-
-static struct sg_table *
- exynos_gem_map_dma_buf(struct dma_buf_attachment *attach,
- enum dma_data_direction dir)
-{
- struct exynos_drm_dmabuf_attachment *exynos_attach = attach->priv;
- struct exynos_drm_gem_obj *gem_obj = dma_buf_to_obj(attach->dmabuf);
- struct drm_device *dev = gem_obj->base.dev;
- struct exynos_drm_gem_buf *buf;
- struct scatterlist *rd, *wr;
- struct sg_table *sgt = NULL;
- unsigned int i;
- int nents, ret;
-
- /* just return current sgt if already requested. */
- if (exynos_attach->dir == dir && exynos_attach->is_mapped)
- return &exynos_attach->sgt;
-
- buf = gem_obj->buffer;
- if (!buf) {
- DRM_ERROR("buffer is null.\n");
- return ERR_PTR(-ENOMEM);
- }
-
- sgt = &exynos_attach->sgt;
-
- ret = sg_alloc_table(sgt, buf->sgt->orig_nents, GFP_KERNEL);
- if (ret) {
- DRM_ERROR("failed to alloc sgt.\n");
- return ERR_PTR(-ENOMEM);
- }
-
- mutex_lock(&dev->struct_mutex);
-
- rd = buf->sgt->sgl;
- wr = sgt->sgl;
- for (i = 0; i < sgt->orig_nents; ++i) {
- sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
- rd = sg_next(rd);
- wr = sg_next(wr);
- }
-
- if (dir != DMA_NONE) {
- nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir);
- if (!nents) {
- DRM_ERROR("failed to map sgl with iommu.\n");
- sg_free_table(sgt);
- sgt = ERR_PTR(-EIO);
- goto err_unlock;
- }
- }
-
- exynos_attach->is_mapped = true;
- exynos_attach->dir = dir;
- attach->priv = exynos_attach;
-
- DRM_DEBUG_PRIME("buffer size = 0x%lx\n", buf->size);
-
-err_unlock:
- mutex_unlock(&dev->struct_mutex);
- return sgt;
-}
-
-static void exynos_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
- struct sg_table *sgt,
- enum dma_data_direction dir)
-{
- /* Nothing to do. */
-}
-
-static void *exynos_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
- unsigned long page_num)
-{
- /* TODO */
-
- return NULL;
-}
-
-static void exynos_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
- unsigned long page_num,
- void *addr)
-{
- /* TODO */
-}
-
-static void *exynos_gem_dmabuf_kmap(struct dma_buf *dma_buf,
- unsigned long page_num)
-{
- /* TODO */
-
- return NULL;
-}
-
-static void exynos_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
- unsigned long page_num, void *addr)
-{
- /* TODO */
-}
-
-static int exynos_gem_dmabuf_mmap(struct dma_buf *dma_buf,
- struct vm_area_struct *vma)
-{
- return -ENOTTY;
-}
-
-static struct dma_buf_ops exynos_dmabuf_ops = {
- .attach = exynos_gem_attach_dma_buf,
- .detach = exynos_gem_detach_dma_buf,
- .map_dma_buf = exynos_gem_map_dma_buf,
- .unmap_dma_buf = exynos_gem_unmap_dma_buf,
- .kmap = exynos_gem_dmabuf_kmap,
- .kmap_atomic = exynos_gem_dmabuf_kmap_atomic,
- .kunmap = exynos_gem_dmabuf_kunmap,
- .kunmap_atomic = exynos_gem_dmabuf_kunmap_atomic,
- .mmap = exynos_gem_dmabuf_mmap,
- .release = drm_gem_dmabuf_release,
-};
-
-struct dma_buf *exynos_dmabuf_prime_export(struct drm_device *drm_dev,
- struct drm_gem_object *obj, int flags)
-{
- struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
- DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
-
- exp_info.ops = &exynos_dmabuf_ops;
- exp_info.size = exynos_gem_obj->base.size;
- exp_info.flags = flags;
- exp_info.priv = obj;
-
- return dma_buf_export(&exp_info);
-}
-
-struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
- struct dma_buf *dma_buf)
-{
- struct dma_buf_attachment *attach;
- struct sg_table *sgt;
- struct scatterlist *sgl;
- struct exynos_drm_gem_obj *exynos_gem_obj;
- struct exynos_drm_gem_buf *buffer;
- int ret;
-
- /* is this one of own objects? */
- if (dma_buf->ops == &exynos_dmabuf_ops) {
- struct drm_gem_object *obj;
-
- obj = dma_buf->priv;
-
- /* is it from our device? */
- if (obj->dev == drm_dev) {
- /*
- * Importing dmabuf exported from out own gem increases
- * refcount on gem itself instead of f_count of dmabuf.
- */
- drm_gem_object_reference(obj);
- return obj;
- }
- }
-
- attach = dma_buf_attach(dma_buf, drm_dev->dev);
- if (IS_ERR(attach))
- return ERR_PTR(-EINVAL);
-
- get_dma_buf(dma_buf);
-
- sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
- if (IS_ERR(sgt)) {
- ret = PTR_ERR(sgt);
- goto err_buf_detach;
- }
-
- buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
- if (!buffer) {
- ret = -ENOMEM;
- goto err_unmap_attach;
- }
-
- exynos_gem_obj = exynos_drm_gem_init(drm_dev, dma_buf->size);
- if (!exynos_gem_obj) {
- ret = -ENOMEM;
- goto err_free_buffer;
- }
-
- sgl = sgt->sgl;
-
- buffer->size = dma_buf->size;
- buffer->dma_addr = sg_dma_address(sgl);
-
- if (sgt->nents == 1) {
- /* always physically continuous memory if sgt->nents is 1. */
- exynos_gem_obj->flags |= EXYNOS_BO_CONTIG;
- } else {
- /*
- * this case could be CONTIG or NONCONTIG type but for now
- * sets NONCONTIG.
- * TODO. we have to find a way that exporter can notify
- * the type of its own buffer to importer.
- */
- exynos_gem_obj->flags |= EXYNOS_BO_NONCONTIG;
- }
-
- exynos_gem_obj->buffer = buffer;
- buffer->sgt = sgt;
- exynos_gem_obj->base.import_attach = attach;
-
- DRM_DEBUG_PRIME("dma_addr = %pad, size = 0x%lx\n", &buffer->dma_addr,
- buffer->size);
-
- return &exynos_gem_obj->base;
-
-err_free_buffer:
- kfree(buffer);
- buffer = NULL;
-err_unmap_attach:
- dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
-err_buf_detach:
- dma_buf_detach(dma_buf, attach);
- dma_buf_put(dma_buf);
-
- return ERR_PTR(ret);
-}
Code Review / kvmfornfv.git / blobdiff