drm: GEM CMA: Add DRM PRIME support
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Laurent Pinchart
parent
ebaf9e033e
commit
71d7282a0f
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@ -21,6 +21,7 @@
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/export.h>
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#include <linux/dma-buf.h>
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#include <linux/dma-mapping.h>
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#include <drm/drmP.h>
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@ -82,6 +83,8 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
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unsigned int size)
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{
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struct drm_gem_cma_object *cma_obj;
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struct sg_table *sgt = NULL;
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int ret;
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size = round_up(size, PAGE_SIZE);
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@ -94,11 +97,29 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
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if (!cma_obj->vaddr) {
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dev_err(drm->dev, "failed to allocate buffer with size %d\n",
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size);
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drm_gem_cma_free_object(&cma_obj->base);
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return ERR_PTR(-ENOMEM);
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ret = -ENOMEM;
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goto error;
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}
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sgt = kzalloc(sizeof(*cma_obj->sgt), GFP_KERNEL);
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if (sgt == NULL) {
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ret = -ENOMEM;
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goto error;
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}
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ret = dma_get_sgtable(drm->dev, sgt, cma_obj->vaddr,
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cma_obj->paddr, size);
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if (ret < 0)
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goto error;
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cma_obj->sgt = sgt;
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return cma_obj;
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error:
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kfree(sgt);
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drm_gem_cma_free_object(&cma_obj->base);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_create);
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@ -156,9 +177,16 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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if (cma_obj->vaddr)
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if (cma_obj->vaddr) {
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dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
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cma_obj->vaddr, cma_obj->paddr);
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if (cma_obj->sgt) {
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sg_free_table(cma_obj->sgt);
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kfree(cma_obj->sgt);
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}
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} else if (gem_obj->import_attach) {
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drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
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}
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drm_gem_object_release(gem_obj);
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@ -291,3 +319,286 @@ void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
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#endif
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/* -----------------------------------------------------------------------------
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* DMA-BUF
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*/
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struct drm_gem_cma_dmabuf_attachment {
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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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static int drm_gem_cma_dmabuf_attach(struct dma_buf *dmabuf, struct device *dev,
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struct dma_buf_attachment *attach)
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{
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struct drm_gem_cma_dmabuf_attachment *cma_attach;
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cma_attach = kzalloc(sizeof(*cma_attach), GFP_KERNEL);
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if (!cma_attach)
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return -ENOMEM;
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cma_attach->dir = DMA_NONE;
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attach->priv = cma_attach;
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return 0;
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}
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static void drm_gem_cma_dmabuf_detach(struct dma_buf *dmabuf,
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struct dma_buf_attachment *attach)
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{
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struct drm_gem_cma_dmabuf_attachment *cma_attach = attach->priv;
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struct sg_table *sgt;
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if (cma_attach == NULL)
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return;
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sgt = &cma_attach->sgt;
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if (cma_attach->dir != DMA_NONE)
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dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
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cma_attach->dir);
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sg_free_table(sgt);
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kfree(cma_attach);
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attach->priv = NULL;
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}
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static struct sg_table *
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drm_gem_cma_dmabuf_map(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_cma_dmabuf_attachment *cma_attach = attach->priv;
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struct drm_gem_cma_object *cma_obj = attach->dmabuf->priv;
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struct drm_device *drm = cma_obj->base.dev;
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struct scatterlist *rd, *wr;
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struct sg_table *sgt;
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unsigned int i;
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int nents, ret;
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DRM_DEBUG_PRIME("\n");
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if (WARN_ON(dir == DMA_NONE))
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return ERR_PTR(-EINVAL);
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/* Return the cached mapping when possible. */
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if (cma_attach->dir == dir)
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return &cma_attach->sgt;
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/* Two mappings with different directions for the same attachment are
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* not allowed.
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*/
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if (WARN_ON(cma_attach->dir != DMA_NONE))
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return ERR_PTR(-EBUSY);
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sgt = &cma_attach->sgt;
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ret = sg_alloc_table(sgt, cma_obj->sgt->orig_nents, GFP_KERNEL);
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if (ret) {
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DRM_ERROR("failed to alloc sgt.\n");
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return ERR_PTR(-ENOMEM);
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}
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mutex_lock(&drm->struct_mutex);
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rd = cma_obj->sgt->sgl;
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wr = sgt->sgl;
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for (i = 0; i < sgt->orig_nents; ++i) {
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sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
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rd = sg_next(rd);
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wr = sg_next(wr);
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}
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nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir);
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if (!nents) {
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DRM_ERROR("failed to map sgl with iommu.\n");
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sg_free_table(sgt);
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sgt = ERR_PTR(-EIO);
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goto done;
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}
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cma_attach->dir = dir;
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attach->priv = cma_attach;
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DRM_DEBUG_PRIME("buffer size = %zu\n", cma_obj->base.size);
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done:
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mutex_unlock(&drm->struct_mutex);
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return sgt;
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}
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static void drm_gem_cma_dmabuf_unmap(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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/* Nothing to do. */
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}
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static void drm_gem_cma_dmabuf_release(struct dma_buf *dmabuf)
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{
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struct drm_gem_cma_object *cma_obj = dmabuf->priv;
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DRM_DEBUG_PRIME("%s\n", __FILE__);
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/*
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* drm_gem_cma_dmabuf_release() call means that file object's
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* f_count is 0 and it calls drm_gem_object_handle_unreference()
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* to drop the references that these values had been increased
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* at drm_prime_handle_to_fd()
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*/
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if (cma_obj->base.export_dma_buf == dmabuf) {
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cma_obj->base.export_dma_buf = NULL;
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/*
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* drop this gem object refcount to release allocated buffer
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* and resources.
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*/
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drm_gem_object_unreference_unlocked(&cma_obj->base);
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}
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}
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static void *drm_gem_cma_dmabuf_kmap_atomic(struct dma_buf *dmabuf,
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unsigned long page_num)
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{
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/* TODO */
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return NULL;
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}
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static void drm_gem_cma_dmabuf_kunmap_atomic(struct dma_buf *dmabuf,
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unsigned long page_num, void *addr)
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{
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/* TODO */
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}
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static void *drm_gem_cma_dmabuf_kmap(struct dma_buf *dmabuf,
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unsigned long page_num)
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{
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/* TODO */
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return NULL;
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}
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static void drm_gem_cma_dmabuf_kunmap(struct dma_buf *dmabuf,
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unsigned long page_num, void *addr)
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{
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/* TODO */
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}
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static int drm_gem_cma_dmabuf_mmap(struct dma_buf *dmabuf,
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struct vm_area_struct *vma)
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{
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struct drm_gem_cma_object *cma_obj = dmabuf->priv;
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struct drm_gem_object *gem_obj = &cma_obj->base;
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int ret;
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ret = drm_gem_mmap_obj(gem_obj, gem_obj->size, vma);
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if (ret < 0)
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return ret;
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return drm_gem_cma_mmap_obj(cma_obj, vma);
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}
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static void *drm_gem_cma_dmabuf_vmap(struct dma_buf *dmabuf)
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{
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struct drm_gem_cma_object *cma_obj = dmabuf->priv;
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return cma_obj->vaddr;
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}
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static struct dma_buf_ops drm_gem_cma_dmabuf_ops = {
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.attach = drm_gem_cma_dmabuf_attach,
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.detach = drm_gem_cma_dmabuf_detach,
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.map_dma_buf = drm_gem_cma_dmabuf_map,
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.unmap_dma_buf = drm_gem_cma_dmabuf_unmap,
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.kmap = drm_gem_cma_dmabuf_kmap,
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.kmap_atomic = drm_gem_cma_dmabuf_kmap_atomic,
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.kunmap = drm_gem_cma_dmabuf_kunmap,
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.kunmap_atomic = drm_gem_cma_dmabuf_kunmap_atomic,
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.mmap = drm_gem_cma_dmabuf_mmap,
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.vmap = drm_gem_cma_dmabuf_vmap,
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.release = drm_gem_cma_dmabuf_release,
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};
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struct dma_buf *drm_gem_cma_dmabuf_export(struct drm_device *drm,
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struct drm_gem_object *obj, int flags)
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{
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struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
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return dma_buf_export(cma_obj, &drm_gem_cma_dmabuf_ops,
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cma_obj->base.size, flags);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_export);
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struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm,
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struct dma_buf *dma_buf)
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{
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struct drm_gem_cma_object *cma_obj;
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struct dma_buf_attachment *attach;
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struct sg_table *sgt;
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int ret;
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DRM_DEBUG_PRIME("%s\n", __FILE__);
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/* is this one of own objects? */
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if (dma_buf->ops == &drm_gem_cma_dmabuf_ops) {
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struct drm_gem_object *obj;
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cma_obj = dma_buf->priv;
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obj = &cma_obj->base;
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/* is it from our device? */
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if (obj->dev == drm) {
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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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dma_buf_put(dma_buf);
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return obj;
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}
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}
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/* Create a CMA GEM buffer. */
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cma_obj = __drm_gem_cma_create(drm, dma_buf->size);
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if (IS_ERR(cma_obj))
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return ERR_PTR(PTR_ERR(cma_obj));
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/* Attach to the buffer and map it. Make sure the mapping is contiguous
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* on the device memory bus, as that's all we support.
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*/
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attach = dma_buf_attach(dma_buf, drm->dev);
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if (IS_ERR(attach)) {
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ret = -EINVAL;
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goto error_gem_free;
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}
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sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
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if (IS_ERR_OR_NULL(sgt)) {
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ret = sgt ? PTR_ERR(sgt) : -ENOMEM;
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goto error_buf_detach;
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}
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if (sgt->nents != 1) {
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ret = -EINVAL;
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goto error_buf_unmap;
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}
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cma_obj->base.import_attach = attach;
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cma_obj->paddr = sg_dma_address(sgt->sgl);
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cma_obj->sgt = sgt;
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DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr,
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dma_buf->size);
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return &cma_obj->base;
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error_buf_unmap:
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dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
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error_buf_detach:
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dma_buf_detach(dma_buf, attach);
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error_gem_free:
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drm_gem_cma_free_object(&cma_obj->base);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_import);
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@ -4,6 +4,9 @@
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struct drm_gem_cma_object {
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struct drm_gem_object base;
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dma_addr_t paddr;
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struct sg_table *sgt;
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/* For objects with DMA memory allocated by GEM CMA */
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void *vaddr;
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};
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@ -45,4 +48,10 @@ extern const struct vm_operations_struct drm_gem_cma_vm_ops;
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void drm_gem_cma_describe(struct drm_gem_cma_object *obj, struct seq_file *m);
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#endif
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struct dma_buf *drm_gem_cma_dmabuf_export(struct drm_device *drm_dev,
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struct drm_gem_object *obj,
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int flags);
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struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm_dev,
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struct dma_buf *dma_buf);
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#endif /* __DRM_GEM_CMA_HELPER_H__ */
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