Commit 1e0b2318 authored by Sergey Senozhatsky's avatar Sergey Senozhatsky Committed by Mauro Carvalho Chehab

media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag

This patch lets user-space to request a non-consistent memory
allocation during CREATE_BUFS and REQBUFS ioctl calls.

= CREATE_BUFS

  struct v4l2_create_buffers has seven 4-byte reserved areas,
  so reserved[0] is renamed to ->flags. The struct, thus, now
  has six reserved 4-byte regions.

= CREATE_BUFS32

  struct v4l2_create_buffers32 has seven 4-byte reserved areas,
  so reserved[0] is renamed to ->flags. The struct, thus, now
  has six reserved 4-byte regions.

= REQBUFS

 We use one bit of a ->reserved[1] member of struct v4l2_requestbuffers,
 which is now renamed to ->flags. Unlike v4l2_create_buffers, struct
 v4l2_requestbuffers does not have enough reserved room. Therefore for
 backward compatibility  ->reserved and ->flags were put into anonymous
 union.
Signed-off-by: default avatarSergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent 7b4b4555
......@@ -121,7 +121,12 @@ than the number requested.
other changes, then set ``count`` to 0, ``memory`` to
``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type.
* - __u32
- ``reserved``\ [7]
- ``flags``
- Specifies additional buffer management attributes.
See :ref:`memory-flags`.
* - __u32
- ``reserved``\ [6]
- A place holder for future extensions. Drivers and applications
must set the array to zero.
......
......@@ -112,10 +112,17 @@ aborting or finishing any DMA in progress, an implicit
``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will
free any previously allocated buffers, so this is typically something
that will be done at the start of the application.
* - union {
- (anonymous)
* - __u32
- ``flags``
- Specifies additional buffer management attributes.
See :ref:`memory-flags`.
* - __u32
- ``reserved``\ [1]
- A place holder for future extensions. Drivers and applications
must set the array to zero.
- Kept for backwards compatibility. Use ``flags`` instead.
* - }
-
.. tabularcolumns:: |p{6.1cm}|p{2.2cm}|p{8.7cm}|
......
......@@ -694,6 +694,9 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int i;
int ret;
if (flags & V4L2_FLAG_MEMORY_NON_CONSISTENT)
consistent_mem = false;
if (q->streaming) {
dprintk(1, "streaming active\n");
return -EBUSY;
......@@ -837,6 +840,9 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
bool consistent_mem = true;
int ret;
if (flags & V4L2_FLAG_MEMORY_NON_CONSISTENT)
consistent_mem = false;
if (q->num_buffers == VB2_MAX_FRAME) {
dprintk(1, "maximum number of buffers already allocated\n");
return -ENOBUFS;
......
......@@ -718,12 +718,22 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
#endif
}
static void clear_consistency_attr(struct vb2_queue *q,
int memory,
unsigned int *flags)
{
if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP)
*flags &= ~V4L2_FLAG_MEMORY_NON_CONSISTENT;
}
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
{
int ret = vb2_verify_memory_type(q, req->memory, req->type);
fill_buf_caps(q, &req->capabilities);
return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count);
clear_consistency_attr(q, req->memory, &req->flags);
return ret ? ret : vb2_core_reqbufs(q, req->memory,
req->flags, &req->count);
}
EXPORT_SYMBOL_GPL(vb2_reqbufs);
......@@ -755,6 +765,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
unsigned i;
fill_buf_caps(q, &create->capabilities);
clear_consistency_attr(q, create->memory, &create->flags);
create->index = q->num_buffers;
if (create->count == 0)
return ret != -EBUSY ? ret : 0;
......@@ -797,8 +808,11 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
for (i = 0; i < requested_planes; i++)
if (requested_sizes[i] == 0)
return -EINVAL;
return ret ? ret : vb2_core_create_bufs(q, create->memory, 0,
&create->count, requested_planes, requested_sizes);
return ret ? ret : vb2_core_create_bufs(q, create->memory,
create->flags,
&create->count,
requested_planes,
requested_sizes);
}
EXPORT_SYMBOL_GPL(vb2_create_bufs);
......@@ -969,11 +983,12 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv,
int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
fill_buf_caps(vdev->queue, &p->capabilities);
clear_consistency_attr(vdev->queue, p->memory, &p->flags);
if (res)
return res;
if (vb2_queue_is_busy(vdev, file))
return -EBUSY;
res = vb2_core_reqbufs(vdev->queue, p->memory, 0, &p->count);
res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count);
/* If count == 0, then the owner has released all buffers and he
is no longer owner of the queue. Otherwise we have a new owner. */
if (res == 0)
......@@ -991,6 +1006,7 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv,
p->index = vdev->queue->num_buffers;
fill_buf_caps(vdev->queue, &p->capabilities);
clear_consistency_attr(vdev->queue, p->memory, &p->flags);
/*
* If count == 0, then just check if memory and type are valid.
* Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
......
......@@ -246,6 +246,9 @@ struct v4l2_format32 {
* @memory: buffer memory type
* @format: frame format, for which buffers are requested
* @capabilities: capabilities of this buffer type.
* @flags: additional buffer management attributes (ignored unless the
* queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability and
* configured for MMAP streaming I/O).
* @reserved: future extensions
*/
struct v4l2_create_buffers32 {
......@@ -254,7 +257,8 @@ struct v4l2_create_buffers32 {
__u32 memory; /* enum v4l2_memory */
struct v4l2_format32 format;
__u32 capabilities;
__u32 reserved[7];
__u32 flags;
__u32 reserved[6];
};
static int __bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
......@@ -355,7 +359,8 @@ static int get_v4l2_create32(struct v4l2_create_buffers __user *p64,
{
if (!access_ok(p32, sizeof(*p32)) ||
copy_in_user(p64, p32,
offsetof(struct v4l2_create_buffers32, format)))
offsetof(struct v4l2_create_buffers32, format)) ||
assign_in_user(&p64->flags, &p32->flags))
return -EFAULT;
return __get_v4l2_format32(&p64->format, &p32->format,
aux_buf, aux_space);
......@@ -417,6 +422,7 @@ static int put_v4l2_create32(struct v4l2_create_buffers __user *p64,
copy_in_user(p32, p64,
offsetof(struct v4l2_create_buffers32, format)) ||
assign_in_user(&p32->capabilities, &p64->capabilities) ||
assign_in_user(&p32->flags, &p64->flags) ||
copy_in_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
return -EFAULT;
return __put_v4l2_format32(&p64->format, &p32->format);
......
......@@ -2038,9 +2038,6 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
if (ret)
return ret;
CLEAR_AFTER_FIELD(p, capabilities);
return ops->vidioc_reqbufs(file, fh, p);
}
......@@ -2080,7 +2077,7 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
if (ret)
return ret;
CLEAR_AFTER_FIELD(create, capabilities);
CLEAR_AFTER_FIELD(create, flags);
v4l_sanitize_format(&create->format);
......
......@@ -946,7 +946,10 @@ struct v4l2_requestbuffers {
__u32 type; /* enum v4l2_buf_type */
__u32 memory; /* enum v4l2_memory */
__u32 capabilities;
union {
__u32 flags;
__u32 reserved[1];
};
};
/* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
......@@ -2450,6 +2453,9 @@ struct v4l2_dbg_chip_info {
* @memory: enum v4l2_memory; buffer memory type
* @format: frame format, for which buffers are requested
* @capabilities: capabilities of this buffer type.
* @flags: additional buffer management attributes (ignored unless the
* queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability
* and configured for MMAP streaming I/O).
* @reserved: future extensions
*/
struct v4l2_create_buffers {
......@@ -2458,7 +2464,8 @@ struct v4l2_create_buffers {
__u32 memory;
struct v4l2_format format;
__u32 capabilities;
__u32 reserved[7];
__u32 flags;
__u32 reserved[6];
};
/*
......
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