From: Sumit Semwal <sumit.sem...@ti.com>
Adds DMABUF memory type to v4l framework. Also adds the related file
descriptor in v4l2_plane and v4l2_buffer.
Signed-off-by: Tomasz Stanislawski <t.stanisl...@samsung.com>
[original work in the PoC for buffer sharing]
Signed-off-by: Sumit Semwal <sumit.sem...@ti.com>
Signed-off-by: Sumit Semwal <sumit.sem...@linaro.org>
Acked-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verk...@cisco.com>
---
drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 18 ++++++++++++++++++
drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
include/linux/videodev2.h | 7 +++++++
3 files changed, 26 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index 83ffb64..cc5998b 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -297,6 +297,7 @@ struct v4l2_plane32 {
union {
__u32 mem_offset;
compat_long_t userptr;
+ __s32 fd;
} m;
__u32 data_offset;
__u32 reserved[11];
@@ -318,6 +319,7 @@ struct v4l2_buffer32 {
__u32 offset;
compat_long_t userptr;
compat_caddr_t planes;
+ __s32 fd;
} m;
__u32 length;
__u32 reserved2;
@@ -341,6 +343,9 @@ static int get_v4l2_plane32(struct v4l2_plane *up, struct
v4l2_plane32 *up32,
up_pln = compat_ptr(p);
if (put_user((unsigned long)up_pln, &up->m.userptr))
return -EFAULT;
+ } else if (memory == V4L2_MEMORY_DMABUF) {
+ if (copy_in_user(&up->m.fd, &up32->m.fd, sizeof(int)))
+ return -EFAULT;
} else {
if (copy_in_user(&up->m.mem_offset, &up32->m.mem_offset,
sizeof(__u32)))
@@ -364,6 +369,11 @@ static int put_v4l2_plane32(struct v4l2_plane *up, struct
v4l2_plane32 *up32,
if (copy_in_user(&up32->m.mem_offset, &up->m.mem_offset,
sizeof(__u32)))
return -EFAULT;
+ /* For DMABUF, driver might've set up the fd, so copy it back. */
+ if (memory == V4L2_MEMORY_DMABUF)
+ if (copy_in_user(&up32->m.fd, &up->m.fd,
+ sizeof(int)))
+ return -EFAULT;
return 0;
}
@@ -446,6 +456,10 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp,
struct v4l2_buffer32 __user
if (get_user(kp->m.offset, &up->m.offset))
return -EFAULT;
break;
+ case V4L2_MEMORY_DMABUF:
+ if (get_user(kp->m.fd, &up->m.fd))
+ return -EFAULT;
+ break;
}
}
@@ -510,6 +524,10 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp,
struct v4l2_buffer32 __user
if (put_user(kp->m.offset, &up->m.offset))
return -EFAULT;
break;
+ case V4L2_MEMORY_DMABUF:
+ if (put_user(kp->m.fd, &up->m.fd))
+ return -EFAULT;
+ break;
}
}
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c
b/drivers/media/v4l2-core/v4l2-ioctl.c
index 8f388ff..530a67e 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -155,6 +155,7 @@ static const char *v4l2_memory_names[] = {
[V4L2_MEMORY_MMAP] = "mmap",
[V4L2_MEMORY_USERPTR] = "userptr",
[V4L2_MEMORY_OVERLAY] = "overlay",
+ [V4L2_MEMORY_DMABUF] = "dmabuf",
};
#define prt_names(a, arr) (((unsigned)(a)) < ARRAY_SIZE(arr) ? arr[a] :
"unknown")
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index 873adbe..07bc5d6 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -188,6 +188,7 @@ enum v4l2_memory {
V4L2_MEMORY_MMAP = 1,
V4L2_MEMORY_USERPTR = 2,
V4L2_MEMORY_OVERLAY = 3,
+ V4L2_MEMORY_DMABUF = 4,
};
/* see also http://vektor.theorem.ca/graphics/ycbcr/ */
@@ -604,6 +605,8 @@ struct v4l2_requestbuffers {
* should be passed to mmap() called on the video node)
* @userptr: when memory is V4L2_MEMORY_USERPTR, a userspace pointer
* pointing to this plane
+ * @fd: when memory is V4L2_MEMORY_DMABUF, a userspace
file
+ * descriptor associated with this plane
* @data_offset: offset in the plane to the start of data; usually 0,
* unless there is a header in front of the data
*
@@ -618,6 +621,7 @@ struct v4l2_plane {
union {
__u32 mem_offset;
unsigned long userptr;
+ __s32 fd;
} m;
__u32 data_offset;
__u32 reserved[11];
@@ -642,6 +646,8 @@ struct v4l2_plane {
* (or a "cookie" that should be passed to mmap() as offset)
* @userptr: for non-multiplanar buffers with memory == V4L2_MEMORY_USERPTR;
* a userspace pointer pointing to this buffer
+ * @fd: for non-multiplanar buffers with memory ==
V4L2_MEMORY_DMABUF;
+ * a userspace file descriptor associated with this buffer
* @planes: for multiplanar buffers; userspace pointer to the array of plane
* info structs for this buffer
* @length: size in bytes of the buffer (NOT its payload) for single-plane
@@ -668,6 +674,7 @@ struct v4l2_buffer {
__u32 offset;
unsigned long userptr;
struct v4l2_plane *planes;
+ __s32 fd;
} m;
__u32 length;
__u32 reserved2;
--
1.7.9.5
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