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[media] v4l: vb2-dma-contig: add support for dma_buf importing
This patch makes changes for adding dma-contig as a dma_buf user. It provides function implementations for the {attach, detach, map, unmap}_dmabuf() mem_ops of DMABUF memory type. [author of the original patch] [integration with refactored dma-contig allocator] Signed-off-by: Sumit Semwal <sumit.semwal@ti.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -69,6 +69,7 @@ config VIDEOBUF2_DMA_CONTIG
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tristate
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select VIDEOBUF2_CORE
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select VIDEOBUF2_MEMOPS
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select DMA_SHARED_BUFFER
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config VIDEOBUF2_VMALLOC
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tristate
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@ -10,6 +10,7 @@
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* the Free Software Foundation.
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*/
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#include <linux/dma-buf.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/sched.h>
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@ -38,6 +39,9 @@ struct vb2_dc_buf {
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/* USERPTR related */
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struct vm_area_struct *vma;
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/* DMABUF related */
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struct dma_buf_attachment *db_attach;
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};
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/*********************************************/
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@ -108,7 +112,8 @@ static void vb2_dc_prepare(void *buf_priv)
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struct vb2_dc_buf *buf = buf_priv;
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struct sg_table *sgt = buf->dma_sgt;
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if (!sgt)
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/* DMABUF exporter will flush the cache for us */
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if (!sgt || buf->db_attach)
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return;
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dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
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@ -119,7 +124,8 @@ static void vb2_dc_finish(void *buf_priv)
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struct vb2_dc_buf *buf = buf_priv;
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struct sg_table *sgt = buf->dma_sgt;
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if (!sgt)
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/* DMABUF exporter will flush the cache for us */
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if (!sgt || buf->db_attach)
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return;
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dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
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@ -376,6 +382,112 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr,
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return ERR_PTR(ret);
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}
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/*********************************************/
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/* callbacks for DMABUF buffers */
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/*********************************************/
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static int vb2_dc_map_dmabuf(void *mem_priv)
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{
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struct vb2_dc_buf *buf = mem_priv;
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struct sg_table *sgt;
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unsigned long contig_size;
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if (WARN_ON(!buf->db_attach)) {
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pr_err("trying to pin a non attached buffer\n");
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return -EINVAL;
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}
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if (WARN_ON(buf->dma_sgt)) {
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pr_err("dmabuf buffer is already pinned\n");
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return 0;
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}
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/* get the associated scatterlist for this buffer */
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sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir);
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if (IS_ERR_OR_NULL(sgt)) {
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pr_err("Error getting dmabuf scatterlist\n");
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return -EINVAL;
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}
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/* checking if dmabuf is big enough to store contiguous chunk */
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contig_size = vb2_dc_get_contiguous_size(sgt);
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if (contig_size < buf->size) {
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pr_err("contiguous chunk is too small %lu/%lu b\n",
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contig_size, buf->size);
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dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir);
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return -EFAULT;
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}
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buf->dma_addr = sg_dma_address(sgt->sgl);
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buf->dma_sgt = sgt;
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return 0;
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}
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static void vb2_dc_unmap_dmabuf(void *mem_priv)
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{
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struct vb2_dc_buf *buf = mem_priv;
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struct sg_table *sgt = buf->dma_sgt;
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if (WARN_ON(!buf->db_attach)) {
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pr_err("trying to unpin a not attached buffer\n");
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return;
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}
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if (WARN_ON(!sgt)) {
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pr_err("dmabuf buffer is already unpinned\n");
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return;
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}
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dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir);
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buf->dma_addr = 0;
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buf->dma_sgt = NULL;
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}
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static void vb2_dc_detach_dmabuf(void *mem_priv)
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{
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struct vb2_dc_buf *buf = mem_priv;
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/* if vb2 works correctly you should never detach mapped buffer */
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if (WARN_ON(buf->dma_addr))
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vb2_dc_unmap_dmabuf(buf);
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/* detach this attachment */
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dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach);
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kfree(buf);
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}
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static void *vb2_dc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf,
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unsigned long size, int write)
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{
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struct vb2_dc_conf *conf = alloc_ctx;
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struct vb2_dc_buf *buf;
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struct dma_buf_attachment *dba;
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if (dbuf->size < size)
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return ERR_PTR(-EFAULT);
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buf = kzalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf)
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return ERR_PTR(-ENOMEM);
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buf->dev = conf->dev;
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/* create attachment for the dmabuf with the user device */
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dba = dma_buf_attach(dbuf, buf->dev);
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if (IS_ERR(dba)) {
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pr_err("failed to attach dmabuf\n");
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kfree(buf);
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return dba;
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}
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buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
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buf->size = size;
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buf->db_attach = dba;
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return buf;
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}
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/*********************************************/
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/* DMA CONTIG exported functions */
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/*********************************************/
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@ -390,6 +502,10 @@ const struct vb2_mem_ops vb2_dma_contig_memops = {
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.put_userptr = vb2_dc_put_userptr,
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.prepare = vb2_dc_prepare,
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.finish = vb2_dc_finish,
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.map_dmabuf = vb2_dc_map_dmabuf,
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.unmap_dmabuf = vb2_dc_unmap_dmabuf,
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.attach_dmabuf = vb2_dc_attach_dmabuf,
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.detach_dmabuf = vb2_dc_detach_dmabuf,
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.num_users = vb2_dc_num_users,
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};
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EXPORT_SYMBOL_GPL(vb2_dma_contig_memops);
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