This patch extends the videobuf2 framework with new helper functions and
modifies existing ones to support multi-size video-buffers.
Signed-off-by: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
---
v2: fix offset calculation in __setup_offsets()
drivers/media/video/videobuf2-core.c | 195 ++++++++++++++++++++++++++++++----
include/media/videobuf2-core.h | 15 +++
2 files changed, 187 insertions(+), 23 deletions(-)
diff --git a/drivers/media/video/videobuf2-core.c
b/drivers/media/video/videobuf2-core.c
index 71734a4..20e1572 100644
--- a/drivers/media/video/videobuf2-core.c
+++ b/drivers/media/video/videobuf2-core.c
@@ -41,7 +41,7 @@ module_param(debug, int, 0644);
* __vb2_buf_mem_alloc() - allocate video memory for the given buffer
*/
static int __vb2_buf_mem_alloc(struct vb2_buffer *vb,
- unsigned long *plane_sizes)
+ const unsigned long *plane_sizes)
{
struct vb2_queue *q = vb->vb2_queue;
void *mem_priv;
@@ -107,13 +107,22 @@ static void __vb2_buf_userptr_put(struct vb2_buffer *vb)
* __setup_offsets() - setup unique offsets ("cookies") for every plane in
* every buffer on the queue
*/
-static void __setup_offsets(struct vb2_queue *q)
+static void __setup_offsets(struct vb2_queue *q, unsigned int n)
{
unsigned int buffer, plane;
struct vb2_buffer *vb;
- unsigned long off = 0;
+ unsigned long off;
- for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ if (q->num_buffers) {
+ struct v4l2_plane *p;
+ vb = q->bufs[q->num_buffers - 1];
+ p = &vb->v4l2_planes[vb->num_planes - 1];
+ off = PAGE_ALIGN(p->m.mem_offset + p->length);
+ } else {
+ off = 0;
+ }
+
+ for (buffer = q->num_buffers - n; buffer < q->num_buffers; ++buffer) {
vb = q->bufs[buffer];
if (!vb)
continue;
@@ -139,7 +148,7 @@ static void __setup_offsets(struct vb2_queue *q)
*/
static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory,
unsigned int num_buffers, unsigned int num_planes,
- unsigned long plane_sizes[])
+ const unsigned long plane_sizes[])
{
unsigned int buffer;
struct vb2_buffer *vb;
@@ -160,7 +169,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum
v4l2_memory memory,
vb->state = VB2_BUF_STATE_DEQUEUED;
vb->vb2_queue = q;
vb->num_planes = num_planes;
- vb->v4l2_buf.index = buffer;
+ vb->v4l2_buf.index = q->num_buffers + buffer;
vb->v4l2_buf.type = q->type;
vb->v4l2_buf.memory = memory;
@@ -188,12 +197,12 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum
v4l2_memory memory,
}
}
- q->bufs[buffer] = vb;
+ q->bufs[q->num_buffers + buffer] = vb;
}
- q->num_buffers = buffer;
+ q->num_buffers += buffer;
- __setup_offsets(q);
+ __setup_offsets(q, buffer);
dprintk(1, "Allocated %d buffers, %d plane(s) each\n",
q->num_buffers, num_planes);
@@ -204,12 +213,13 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum
v4l2_memory memory,
/**
* __vb2_free_mem() - release all video buffer memory for a given queue
*/
-static void __vb2_free_mem(struct vb2_queue *q)
+static void __vb2_free_mem(struct vb2_queue *q, struct v4l2_buffer_span *span)
{
unsigned int buffer;
struct vb2_buffer *vb;
- for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ for (buffer = span->index; buffer < span->index + span->count;
+ ++buffer) {
vb = q->bufs[buffer];
if (!vb)
continue;
@@ -222,18 +232,17 @@ static void __vb2_free_mem(struct vb2_queue *q)
}
}
-/**
- * __vb2_queue_free() - free the queue - video memory and related information
- * and return the queue to an uninitialized state. Might be called even if the
- * queue has already been freed.
- */
-static void __vb2_queue_free(struct vb2_queue *q)
+int vb2_destroy_bufs(struct vb2_queue *q, struct v4l2_buffer_span *span)
{
- unsigned int buffer;
+ int buffer;
+
+ if (span->index + span->count > q->num_buffers)
+ return -EINVAL;
/* Call driver-provided cleanup function for each buffer, if provided */
if (q->ops->buf_cleanup) {
- for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ for (buffer = span->index;
+ buffer < span->index + span->count; ++buffer) {
if (NULL == q->bufs[buffer])
continue;
q->ops->buf_cleanup(q->bufs[buffer]);
@@ -241,16 +250,36 @@ static void __vb2_queue_free(struct vb2_queue *q)
}
/* Release video buffer memory */
- __vb2_free_mem(q);
+ __vb2_free_mem(q, span);
/* Free videobuf buffers */
- for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ for (buffer = span->index;
+ buffer < span->index + span->count; ++buffer) {
kfree(q->bufs[buffer]);
q->bufs[buffer] = NULL;
}
- q->num_buffers = 0;
- q->memory = 0;
+ q->num_buffers -= span->count;
+ if (!q->num_buffers)
+ q->memory = 0;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vb2_destroy_bufs);
+
+/**
+ * __vb2_queue_free() - free the queue - video memory and related information
+ * and return the queue to an uninitialized state. Might be called even if the
+ * queue has already been freed.
+ */
+static void __vb2_queue_free(struct vb2_queue *q)
+{
+ struct v4l2_buffer_span span = {
+ .index = 0,
+ .count = q->num_buffers,
+ };
+
+ vb2_destroy_bufs(q, &span);
}
/**
@@ -576,6 +605,126 @@ free_mem:
}
EXPORT_SYMBOL_GPL(vb2_reqbufs);
+int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
+{
+ unsigned int num_planes, num_buffers = 0;
+ unsigned long plane_sizes[VIDEO_MAX_PLANES] = {create->size};
+ 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;
+ }
+
+ if (q->num_buffers == VIDEO_MAX_FRAME) {
+ dprintk(1, "%s(): maximum number of buffers already
allocated\n",
+ __func__);
+ return -ENOBUFS;
+ }
+
+ create->index = q->num_buffers + 1;
+
+ /*
+ * Make sure the requested values and current defaults are sane.
+ */
+ create->count = min_t(unsigned int, create->count, VIDEO_MAX_FRAME -
q->num_buffers);
+
+ if (!q->num_buffers)
+ memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx));
+
+ /*
+ * Ask the driver how many buffers and planes per buffer it requires.
+ * Driver also sets the size and allocator context for each plane.
+ */
+ ret = call_qop(q, queue_add, q, create, &num_buffers, &num_planes,
+ plane_sizes, q->alloc_ctx);
+ if (ret)
+ return ret;
+
+ /* Finally, allocate buffers and video memory */
+ ret = __vb2_queue_alloc(q, create->memory, num_buffers, num_planes,
+ plane_sizes);
+ if (ret < 0) {
+ dprintk(1, "Memory allocation failed with error: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Check if driver can handle the so far allocated number of buffers.
+ */
+ if (ret < num_buffers) {
+ unsigned int orig_num_buffers;
+
+ create->count = ret;
+ orig_num_buffers = ret;
+
+ /*
+ * num_buffers still contains the number of buffers, that the
+ * queue driver has allocated
+ */
+ ret = call_qop(q, queue_add, q, create, &num_buffers,
+ &num_planes, plane_sizes, q->alloc_ctx);
+ if (ret)
+ goto free_mem;
+
+ if (orig_num_buffers < num_buffers) {
+ ret = -ENOMEM;
+ goto free_mem;
+ }
+
+ /*
+ * Ok, driver accepted smaller number of buffers.
+ */
+ ret = num_buffers;
+ }
+
+ /*
+ * Return the number of successfully allocated buffers
+ * to the userspace.
+ */
+ create->count = ret;
+
+ q->memory = create->memory;
+
+ return 0;
+
+free_mem:
+ __vb2_queue_free(q);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vb2_create_bufs);
+
+int vb2_submit_buf(struct vb2_queue *q, unsigned int idx)
+{
+ return call_qop(q, buf_submit, q->bufs[idx]);
+}
+EXPORT_SYMBOL_GPL(vb2_submit_buf);
+
/**
* vb2_plane_vaddr() - Return a kernel virtual address of a given plane
* @vb: vb2_buffer to which the plane in question belongs to
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index f87472a..88076fc 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -177,6 +177,10 @@ struct vb2_buffer {
* plane should be set in the sizes[] array and optional
* per-plane allocator specific context in alloc_ctxs[]
* array
+ * @queue_add: like above, but called from VIDIOC_CREATE_BUFS, but if
+ * there are already buffers on the queue, it won't replace
+ * them, but add new ones, possibly with a different format
+ * and plane sizes
* @wait_prepare: release any locks taken while calling vb2 functions;
* it is called before an ioctl needs to wait for a new
* buffer to arrive; required to avoid a deadlock in
@@ -194,6 +198,8 @@ struct vb2_buffer {
* each hardware operation in this callback;
* if an error is returned, the buffer will not be queued
* in driver; optional
+ * @buf_submit: called primarily to invalidate buffer caches
for faster
+ * consequent queuing; optional
* @buf_finish: called before every dequeue of the buffer back
to
* userspace; drivers may perform any operations required
* before userspace accesses the buffer; optional
@@ -213,11 +219,16 @@ struct vb2_ops {
int (*queue_setup)(struct vb2_queue *q, unsigned int *num_buffers,
unsigned int *num_planes, unsigned long sizes[],
void *alloc_ctxs[]);
+ int (*queue_add)(struct vb2_queue *q,
+ struct v4l2_create_buffers *create,
+ unsigned int *num_buffers, unsigned int *num_planes,
+ unsigned long sizes[], void *alloc_ctxs[]);
void (*wait_prepare)(struct vb2_queue *q);
void (*wait_finish)(struct vb2_queue *q);
int (*buf_init)(struct vb2_buffer *vb);
+ int (*buf_submit)(struct vb2_buffer *vb);
int (*buf_prepare)(struct vb2_buffer *vb);
int (*buf_finish)(struct vb2_buffer *vb);
void (*buf_cleanup)(struct vb2_buffer *vb);
@@ -291,6 +302,10 @@ int vb2_wait_for_all_buffers(struct vb2_queue *q);
int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
+int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
+int vb2_destroy_bufs(struct vb2_queue *q, struct v4l2_buffer_span *span);
+int vb2_submit_buf(struct vb2_queue *q, unsigned int idx);
+
int vb2_queue_init(struct vb2_queue *q);
void vb2_queue_release(struct vb2_queue *q);
--
1.7.2.5
--
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