diff options
Diffstat (limited to 'drivers/media/video/videobuf2-core.c')
| -rw-r--r-- | drivers/media/video/videobuf2-core.c | 417 |
1 files changed, 342 insertions, 75 deletions
diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c index 9d4e9edbd2e..268c7dd4f82 100644 --- a/drivers/media/video/videobuf2-core.c +++ b/drivers/media/video/videobuf2-core.c @@ -336,9 +336,9 @@ static int __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) struct vb2_queue *q = vb->vb2_queue; int ret; - /* Copy back data such as timestamp, flags, input, etc. */ + /* Copy back data such as timestamp, flags, etc. */ memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); - b->input = vb->v4l2_buf.input; + b->reserved2 = vb->v4l2_buf.reserved2; b->reserved = vb->v4l2_buf.reserved; if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { @@ -454,7 +454,50 @@ static int __verify_mmap_ops(struct vb2_queue *q) } /** - * vb2_reqbufs() - Initiate streaming + * __verify_memory_type() - Check whether the memory type and buffer type + * passed to a buffer operation are compatible with the queue. + */ +static int __verify_memory_type(struct vb2_queue *q, + enum v4l2_memory memory, enum v4l2_buf_type type) +{ + if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR) { + dprintk(1, "reqbufs: unsupported memory type\n"); + return -EINVAL; + } + + if (type != q->type) { + dprintk(1, "reqbufs: requested type is incorrect\n"); + return -EINVAL; + } + + /* + * Make sure all the required memory ops for given memory type + * are available. + */ + if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { + dprintk(1, "reqbufs: MMAP for current setup unsupported\n"); + return -EINVAL; + } + + if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { + dprintk(1, "reqbufs: USERPTR for current setup unsupported\n"); + return -EINVAL; + } + + /* + * Place the busy tests at the end: -EBUSY can be ignored when + * create_bufs is called with count == 0, but count == 0 should still + * do the memory and type validation. + */ + if (q->fileio) { + dprintk(1, "reqbufs: file io in progress\n"); + return -EBUSY; + } + return 0; +} + +/** + * __reqbufs() - Initiate streaming * @q: videobuf2 queue * @req: struct passed from userspace to vidioc_reqbufs handler in driver * @@ -476,46 +519,16 @@ static int __verify_mmap_ops(struct vb2_queue *q) * The return values from this function are intended to be directly returned * from vidioc_reqbufs handler in driver. */ -int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) +static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) { unsigned int num_buffers, allocated_buffers, num_planes = 0; - int ret = 0; - - if (q->fileio) { - dprintk(1, "reqbufs: file io in progress\n"); - return -EBUSY; - } - - if (req->memory != V4L2_MEMORY_MMAP - && req->memory != V4L2_MEMORY_USERPTR) { - dprintk(1, "reqbufs: unsupported memory type\n"); - return -EINVAL; - } - - if (req->type != q->type) { - dprintk(1, "reqbufs: requested type is incorrect\n"); - return -EINVAL; - } + int ret; if (q->streaming) { dprintk(1, "reqbufs: streaming active\n"); return -EBUSY; } - /* - * Make sure all the required memory ops for given memory type - * are available. - */ - if (req->memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { - dprintk(1, "reqbufs: MMAP for current setup unsupported\n"); - return -EINVAL; - } - - if (req->memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { - dprintk(1, "reqbufs: USERPTR for current setup unsupported\n"); - return -EINVAL; - } - if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { /* * We already have buffers allocated, so first check if they @@ -595,10 +608,23 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) return 0; } + +/** + * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and + * type values. + * @q: videobuf2 queue + * @req: struct passed from userspace to vidioc_reqbufs handler in driver + */ +int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) +{ + int ret = __verify_memory_type(q, req->memory, req->type); + + return ret ? ret : __reqbufs(q, req); +} EXPORT_SYMBOL_GPL(vb2_reqbufs); /** - * vb2_create_bufs() - Allocate buffers and any required auxiliary structs + * __create_bufs() - Allocate buffers and any required auxiliary structs * @q: videobuf2 queue * @create: creation parameters, passed from userspace to vidioc_create_bufs * handler in driver @@ -612,40 +638,10 @@ EXPORT_SYMBOL_GPL(vb2_reqbufs); * The return values from this function are intended to be directly returned * from vidioc_create_bufs handler in driver. */ -int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) +static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) { unsigned int num_planes = 0, num_buffers, allocated_buffers; - int ret = 0; - - if (q->fileio) { - dprintk(1, "%s(): file io in progress\n", __func__); - return -EBUSY; - } - - if (create->memory != V4L2_MEMORY_MMAP - && create->memory != V4L2_MEMORY_USERPTR) { - dprintk(1, "%s(): unsupported memory type\n", __func__); - return -EINVAL; - } - - if (create->format.type != q->type) { - dprintk(1, "%s(): requested type is incorrect\n", __func__); - return -EINVAL; - } - - /* - * Make sure all the required memory ops for given memory type - * are available. - */ - if (create->memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { - dprintk(1, "%s(): MMAP for current setup unsupported\n", __func__); - return -EINVAL; - } - - if (create->memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { - dprintk(1, "%s(): USERPTR for current setup unsupported\n", __func__); - return -EINVAL; - } + int ret; if (q->num_buffers == VIDEO_MAX_FRAME) { dprintk(1, "%s(): maximum number of buffers already allocated\n", @@ -653,8 +649,6 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) return -ENOBUFS; } - create->index = q->num_buffers; - if (!q->num_buffers) { memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); @@ -675,9 +669,9 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) /* Finally, allocate buffers and video memory */ ret = __vb2_queue_alloc(q, create->memory, num_buffers, num_planes); - if (ret < 0) { - dprintk(1, "Memory allocation failed with error: %d\n", ret); - return ret; + if (ret == 0) { + dprintk(1, "Memory allocation failed\n"); + return -ENOMEM; } allocated_buffers = ret; @@ -708,7 +702,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) if (ret < 0) { __vb2_queue_free(q, allocated_buffers); - return ret; + return -ENOMEM; } /* @@ -719,6 +713,23 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) return 0; } + +/** + * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the + * memory and type values. + * @q: videobuf2 queue + * @create: creation parameters, passed from userspace to vidioc_create_bufs + * handler in driver + */ +int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) +{ + int ret = __verify_memory_type(q, create->memory, create->format.type); + + create->index = q->num_buffers; + if (create->count == 0) + return ret != -EBUSY ? ret : 0; + return ret ? ret : __create_bufs(q, create); +} EXPORT_SYMBOL_GPL(vb2_create_bufs); /** @@ -860,7 +871,6 @@ static int __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, vb->v4l2_buf.field = b->field; vb->v4l2_buf.timestamp = b->timestamp; - vb->v4l2_buf.input = b->input; vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_STATE_FLAGS; return 0; @@ -2115,6 +2125,263 @@ size_t vb2_write(struct vb2_queue *q, char __user *data, size_t count, } EXPORT_SYMBOL_GPL(vb2_write); + +/* + * The following functions are not part of the vb2 core API, but are helper + * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations + * and struct vb2_ops. + * They contain boilerplate code that most if not all drivers have to do + * and so they simplify the driver code. + */ + +/* The queue is busy if there is a owner and you are not that owner. */ +static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) +{ + return vdev->queue->owner && vdev->queue->owner != file->private_data; +} + +/* vb2 ioctl helpers */ + +int vb2_ioctl_reqbufs(struct file *file, void *priv, + struct v4l2_requestbuffers *p) +{ + struct video_device *vdev = video_devdata(file); + int res = __verify_memory_type(vdev->queue, p->memory, p->type); + + if (res) + return res; + if (vb2_queue_is_busy(vdev, file)) + return -EBUSY; + res = __reqbufs(vdev->queue, p); + /* 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) + vdev->queue->owner = p->count ? file->private_data : NULL; + return res; +} +EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); + +int vb2_ioctl_create_bufs(struct file *file, void *priv, + struct v4l2_create_buffers *p) +{ + struct video_device *vdev = video_devdata(file); + int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); + + p->index = vdev->queue->num_buffers; + /* If count == 0, then just check if memory and type are valid. + Any -EBUSY result from __verify_memory_type can be mapped to 0. */ + if (p->count == 0) + return res != -EBUSY ? res : 0; + if (res) + return res; + if (vb2_queue_is_busy(vdev, file)) + return -EBUSY; + res = __create_bufs(vdev->queue, p); + if (res == 0) + vdev->queue->owner = file->private_data; + return res; +} +EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); + +int vb2_ioctl_prepare_buf(struct file *file, void *priv, + struct v4l2_buffer *p) +{ + struct video_device *vdev = video_devdata(file); + + if (vb2_queue_is_busy(vdev, file)) + return -EBUSY; + return vb2_prepare_buf(vdev->queue, p); +} +EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); + +int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) +{ + struct video_device *vdev = video_devdata(file); + + /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ + return vb2_querybuf(vdev->queue, p); +} +EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); + +int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) +{ + struct video_device *vdev = video_devdata(file); + + if (vb2_queue_is_busy(vdev, file)) + return -EBUSY; + return vb2_qbuf(vdev->queue, p); +} +EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); + +int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) +{ + struct video_device *vdev = video_devdata(file); + + if (vb2_queue_is_busy(vdev, file)) + return -EBUSY; + return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); +} +EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); + +int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) +{ + struct video_device *vdev = video_devdata(file); + + if (vb2_queue_is_busy(vdev, file)) + return -EBUSY; + return vb2_streamon(vdev->queue, i); +} +EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); + +int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) +{ + struct video_device *vdev = video_devdata(file); + + if (vb2_queue_is_busy(vdev, file)) + return -EBUSY; + return vb2_streamoff(vdev->queue, i); +} +EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); + +/* v4l2_file_operations helpers */ + +int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct video_device *vdev = video_devdata(file); + + return vb2_mmap(vdev->queue, vma); +} +EXPORT_SYMBOL_GPL(vb2_fop_mmap); + +int vb2_fop_release(struct file *file) +{ + struct video_device *vdev = video_devdata(file); + + if (file->private_data == vdev->queue->owner) { + vb2_queue_release(vdev->queue); + vdev->queue->owner = NULL; + } + return v4l2_fh_release(file); +} +EXPORT_SYMBOL_GPL(vb2_fop_release); + +ssize_t vb2_fop_write(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct video_device *vdev = video_devdata(file); + struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; + bool must_lock = !test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && lock; + int err = -EBUSY; + + if (must_lock && mutex_lock_interruptible(lock)) + return -ERESTARTSYS; + if (vb2_queue_is_busy(vdev, file)) + goto exit; + err = vb2_write(vdev->queue, buf, count, ppos, + file->f_flags & O_NONBLOCK); + if (err >= 0) + vdev->queue->owner = file->private_data; +exit: + if (must_lock) + mutex_unlock(lock); + return err; +} +EXPORT_SYMBOL_GPL(vb2_fop_write); + +ssize_t vb2_fop_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct video_device *vdev = video_devdata(file); + struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; + bool must_lock = !test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && vdev->lock; + int err = -EBUSY; + + if (must_lock && mutex_lock_interruptible(lock)) + return -ERESTARTSYS; + if (vb2_queue_is_busy(vdev, file)) + goto exit; + err = vb2_read(vdev->queue, buf, count, ppos, + file->f_flags & O_NONBLOCK); + if (err >= 0) + vdev->queue->owner = file->private_data; +exit: + if (must_lock) + mutex_unlock(lock); + return err; +} +EXPORT_SYMBOL_GPL(vb2_fop_read); + +unsigned int vb2_fop_poll(struct file *file, poll_table *wait) +{ + struct video_device *vdev = video_devdata(file); + struct vb2_queue *q = vdev->queue; + struct mutex *lock = q->lock ? q->lock : vdev->lock; + unsigned long req_events = poll_requested_events(wait); + unsigned res; + void *fileio; + /* Yuck. We really need to get rid of this flag asap. If it is + set, then the core took the serialization lock before calling + poll(). This is being phased out, but for now we have to handle + this case. */ + bool locked = test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags); + bool must_lock = false; + + /* Try to be smart: only lock if polling might start fileio, + otherwise locking will only introduce unwanted delays. */ + if (q->num_buffers == 0 && q->fileio == NULL) { + if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && + (req_events & (POLLIN | POLLRDNORM))) + must_lock = true; + else if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && + (req_events & (POLLOUT | POLLWRNORM))) + must_lock = true; + } + + /* If locking is needed, but this helper doesn't know how, then you + shouldn't be using this helper but you should write your own. */ + WARN_ON(must_lock && !locked && !lock); + + if (must_lock && !locked && lock && mutex_lock_interruptible(lock)) + return POLLERR; + + fileio = q->fileio; + + res = vb2_poll(vdev->queue, file, wait); + + /* If fileio was started, then we have a new queue owner. */ + if (must_lock && !fileio && q->fileio) + q->owner = file->private_data; + if (must_lock && !locked && lock) + mutex_unlock(lock); + return res; +} +EXPORT_SYMBOL_GPL(vb2_fop_poll); + +#ifndef CONFIG_MMU +unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct video_device *vdev = video_devdata(file); + + return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); +} +EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); +#endif + +/* vb2_ops helpers. Only use if vq->lock is non-NULL. */ + +void vb2_ops_wait_prepare(struct vb2_queue *vq) +{ + mutex_unlock(vq->lock); +} +EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); + +void vb2_ops_wait_finish(struct vb2_queue *vq) +{ + mutex_lock(vq->lock); +} +EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); + MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); MODULE_LICENSE("GPL"); |