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dma-buf: use reservation objects

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This allows reservation objects to be used in dma-buf. it's required
for implementing polling support on the fences that belong to a dma-buf.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Mauro Carvalho Chehab <m.chehab@samsung.com> #drivers/media/v4l2-core/
Acked-by: Thomas Hellstrom <thellstrom@vmware.com> #drivers/gpu/drm/ttm
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net> #drivers/gpu/drm/armada/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maarten Lankhorst
2014-07-01 12:57:26 +02:00
committed by Greg Kroah-Hartman
parent 606b23ad60
commit 3aac4502fd
17 changed files with 65 additions and 14 deletions
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22
drivers/dma-buf/dma-buf.c
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@@ -25,10 +25,12 @@
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/dma-buf.h>
#include <linux/fence.h>
#include <linux/anon_inodes.h>
#include <linux/export.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/reservation.h>
static inline int is_dma_buf_file(struct file *);
@@ -56,6 +58,9 @@ static int dma_buf_release(struct inode *inode, struct file *file)
list_del(&dmabuf->list_node);
mutex_unlock(&db_list.lock);
if (dmabuf->resv == (struct reservation_object *)&dmabuf[1])
reservation_object_fini(dmabuf->resv);
kfree(dmabuf);
return 0;
}
@@ -128,6 +133,7 @@ static inline int is_dma_buf_file(struct file *file)
* @size: [in] Size of the buffer
* @flags: [in] mode flags for the file.
* @exp_name: [in] name of the exporting module - useful for debugging.
* @resv: [in] reservation-object, NULL to allocate default one.
*
* Returns, on success, a newly created dma_buf object, which wraps the
* supplied private data and operations for dma_buf_ops. On either missing
@@ -135,10 +141,17 @@ static inline int is_dma_buf_file(struct file *file)
*
*/
struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops,
size_t size, int flags, const char *exp_name)
size_t size, int flags, const char *exp_name,
struct reservation_object *resv)
{
struct dma_buf *dmabuf;
struct file *file;
size_t alloc_size = sizeof(struct dma_buf);
if (!resv)
alloc_size += sizeof(struct reservation_object);
else
/* prevent &dma_buf[1] == dma_buf->resv */
alloc_size += 1;
if (WARN_ON(!priv || !ops
|| !ops->map_dma_buf
@@ -150,7 +163,7 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops,
return ERR_PTR(-EINVAL);
}
dmabuf = kzalloc(sizeof(struct dma_buf), GFP_KERNEL);
dmabuf = kzalloc(alloc_size, GFP_KERNEL);
if (dmabuf == NULL)
return ERR_PTR(-ENOMEM);
@@ -158,6 +171,11 @@ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops,
dmabuf->ops = ops;
dmabuf->size = size;
dmabuf->exp_name = exp_name;
if (!resv) {
resv = (struct reservation_object *)&dmabuf[1];
reservation_object_init(resv);
}
dmabuf->resv = resv;
file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags);
if (IS_ERR(file)) {