[PATCH v7 20/49] media: core: Rework how create_buf index returned value is computed
Benjamin Gaignard
benjamin.gaignard at collabora.com
Thu Sep 14 06:32:54 PDT 2023
When DELETE_BUFS will be introduced holes could created in bufs array.
To be able to reuse these unused indices reworking how create->index
is set is mandatory.
Let __vb2_queue_alloc() decide which first index is correct and
forward this to the caller.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard at collabora.com>
---
.../media/common/videobuf2/videobuf2-core.c | 24 +++++++++++++------
.../media/common/videobuf2/videobuf2-v4l2.c | 17 +++++++------
include/media/videobuf2-core.h | 4 +++-
3 files changed, 30 insertions(+), 15 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 70b6b8f8c390..a4c2fae8705d 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -443,15 +443,24 @@ static void vb2_queue_remove_buffer(struct vb2_queue *q, struct vb2_buffer *vb)
*/
static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
unsigned int num_buffers, unsigned int num_planes,
- const unsigned plane_sizes[VB2_MAX_PLANES])
+ const unsigned plane_sizes[VB2_MAX_PLANES],
+ unsigned int *first)
{
unsigned int buffer, plane;
struct vb2_buffer *vb;
+ unsigned long first_index;
int ret;
/* Ensure that q->num_buffers+num_buffers is below q->max_allowed_buffers */
num_buffers = min_t(unsigned int, num_buffers,
- q->max_allowed_buffers - q->num_buffers);
+ q->max_allowed_buffers - vb2_get_num_buffers(q));
+
+ first_index = vb2_get_num_buffers(q);
+
+ if (first_index >= q->max_allowed_buffers)
+ return 0;
+
+ *first = first_index;
for (buffer = 0; buffer < num_buffers; ++buffer) {
/* Allocate vb2 buffer structures */
@@ -472,7 +481,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
}
call_void_bufop(q, init_buffer, vb);
- if (!vb2_queue_add_buffer(q, vb, q->num_buffers + buffer)) {
+ if (!vb2_queue_add_buffer(q, vb, first_index++)) {
dprintk(q, 1, "failed adding buffer %d to queue\n", buffer);
kfree(vb);
break;
@@ -832,7 +841,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int q_num_bufs = vb2_get_num_buffers(q);
unsigned plane_sizes[VB2_MAX_PLANES] = { };
bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
- unsigned int i;
+ unsigned int i, first;
int ret = 0;
if (q->streaming) {
@@ -919,7 +928,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
/* Finally, allocate buffers and video memory */
allocated_buffers =
- __vb2_queue_alloc(q, memory, num_buffers, num_planes, plane_sizes);
+ __vb2_queue_alloc(q, memory, num_buffers, num_planes, plane_sizes, &first);
if (allocated_buffers == 0) {
dprintk(q, 1, "memory allocation failed\n");
ret = -ENOMEM;
@@ -993,7 +1002,8 @@ EXPORT_SYMBOL_GPL(vb2_core_reqbufs);
int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int flags, unsigned int *count,
unsigned int requested_planes,
- const unsigned int requested_sizes[])
+ const unsigned int requested_sizes[],
+ unsigned int *first)
{
unsigned int num_planes = 0, num_buffers, allocated_buffers;
unsigned plane_sizes[VB2_MAX_PLANES] = { };
@@ -1055,7 +1065,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
/* Finally, allocate buffers and video memory */
allocated_buffers = __vb2_queue_alloc(q, memory, num_buffers,
- num_planes, plane_sizes);
+ num_planes, plane_sizes, first);
if (allocated_buffers == 0) {
dprintk(q, 1, "memory allocation failed\n");
ret = -ENOMEM;
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 3eb707abc26b..a88abcea2921 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -762,7 +762,6 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
fill_buf_caps(q, &create->capabilities);
validate_memory_flags(q, create->memory, &create->flags);
- create->index = q->num_buffers;
if (create->count == 0)
return ret != -EBUSY ? ret : 0;
@@ -804,11 +803,16 @@ 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,
- create->flags,
- &create->count,
- requested_planes,
- requested_sizes);
+ if (ret)
+ return ret;
+
+ ret = vb2_core_create_bufs(q, create->memory,
+ create->flags,
+ &create->count,
+ requested_planes,
+ requested_sizes,
+ &create->index);
+ return ret;
}
EXPORT_SYMBOL_GPL(vb2_create_bufs);
@@ -1036,7 +1040,6 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv,
int res = vb2_verify_memory_type(vdev->queue, p->memory,
p->format.type);
- p->index = vdev->queue->num_buffers;
fill_buf_caps(vdev->queue, &p->capabilities);
validate_memory_flags(vdev->queue, p->memory, &p->flags);
/*
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 1ecaf4b5a76f..19c93d8eb7c8 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -803,6 +803,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
* @count: requested buffer count.
* @requested_planes: number of planes requested.
* @requested_sizes: array with the size of the planes.
+ * @first: index of the first created buffer
*
* Videobuf2 core helper to implement VIDIOC_CREATE_BUFS() operation. It is
* called internally by VB2 by an API-specific handler, like
@@ -819,7 +820,8 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int flags, unsigned int *count,
unsigned int requested_planes,
- const unsigned int requested_sizes[]);
+ const unsigned int requested_sizes[],
+ unsigned int *first);
/**
* vb2_core_prepare_buf() - Pass ownership of a buffer from userspace
--
2.39.2
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