[PATCH v15 08/56] media: videobuf2: Use vb2_get_num_buffers() helper
From: Benjamin Gaignard
Date: Thu Nov 09 2023 - 11:33:02 EST
Stop using queue num_buffers field directly, instead use
vb2_get_num_buffers().
This prepares for the future 'delete buffers' feature where there are
holes in the buffer indices.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxxxxx>
---
version 15:
- Use vb2_get_num_buffers() in __vb2_perform_fileio() intead of testing
bitmap bits.
.../media/common/videobuf2/videobuf2-core.c | 94 ++++++++++---------
.../media/common/videobuf2/videobuf2-v4l2.c | 4 +-
2 files changed, 52 insertions(+), 46 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 0024b82663d4..ce5b84b9bcd4 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -449,13 +449,14 @@ 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])
{
+ unsigned int q_num_buffers = vb2_get_num_buffers(q);
unsigned int buffer, plane;
struct vb2_buffer *vb;
int ret;
/* Ensure that q->num_buffers+num_buffers is below VB2_MAX_FRAME */
num_buffers = min_t(unsigned int, num_buffers,
- VB2_MAX_FRAME - q->num_buffers);
+ VB2_MAX_FRAME - q_num_buffers);
for (buffer = 0; buffer < num_buffers; ++buffer) {
/* Allocate vb2 buffer structures */
@@ -475,7 +476,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
vb->planes[plane].min_length = plane_sizes[plane];
}
- vb2_queue_add_buffer(q, vb, q->num_buffers + buffer);
+ vb2_queue_add_buffer(q, vb, q_num_buffers + buffer);
call_void_bufop(q, init_buffer, vb);
/* Allocate video buffer memory for the MMAP type */
@@ -519,8 +520,9 @@ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
{
unsigned int buffer;
struct vb2_buffer *vb;
+ unsigned int q_num_buffers = vb2_get_num_buffers(q);
- for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
+ for (buffer = q_num_buffers - buffers; buffer < q_num_buffers;
++buffer) {
vb = vb2_get_buffer(q, buffer);
if (!vb)
@@ -544,11 +546,12 @@ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
{
unsigned int buffer;
+ unsigned int q_num_buffers = vb2_get_num_buffers(q);
lockdep_assert_held(&q->mmap_lock);
/* Call driver-provided cleanup function for each buffer, if provided */
- for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
+ for (buffer = q_num_buffers - buffers; buffer < q_num_buffers;
++buffer) {
struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
@@ -564,7 +567,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
* Check that all the calls were balanced during the life-time of this
* queue. If not then dump the counters to the kernel log.
*/
- if (q->num_buffers) {
+ if (q_num_buffers) {
bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming ||
q->cnt_prepare_streaming != q->cnt_unprepare_streaming ||
q->cnt_wait_prepare != q->cnt_wait_finish;
@@ -590,7 +593,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
q->cnt_stop_streaming = 0;
q->cnt_unprepare_streaming = 0;
}
- for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ for (buffer = 0; buffer < vb2_get_num_buffers(q); buffer++) {
struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
bool unbalanced;
@@ -642,7 +645,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
#endif
/* Free vb2 buffers */
- for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
+ for (buffer = q_num_buffers - buffers; buffer < q_num_buffers;
++buffer) {
struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
@@ -654,7 +657,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
}
q->num_buffers -= buffers;
- if (!q->num_buffers) {
+ if (!vb2_get_num_buffers(q)) {
q->memory = VB2_MEMORY_UNKNOWN;
INIT_LIST_HEAD(&q->queued_list);
}
@@ -685,7 +688,7 @@ EXPORT_SYMBOL(vb2_buffer_in_use);
static bool __buffers_in_use(struct vb2_queue *q)
{
unsigned int buffer;
- for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ for (buffer = 0; buffer < vb2_get_num_buffers(q); ++buffer) {
struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
if (!vb)
@@ -811,6 +814,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int flags, unsigned int *count)
{
unsigned int num_buffers, allocated_buffers, num_planes = 0;
+ 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;
@@ -826,7 +830,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
return -EBUSY;
}
- if (*count == 0 || q->num_buffers != 0 ||
+ if (*count == 0 || q_num_bufs != 0 ||
(q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory) ||
!verify_coherency_flags(q, non_coherent_mem)) {
/*
@@ -844,7 +848,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
* queued without ever calling STREAMON.
*/
__vb2_queue_cancel(q);
- __vb2_queue_free(q, q->num_buffers);
+ __vb2_queue_free(q, q_num_bufs);
mutex_unlock(&q->mmap_lock);
/*
@@ -939,7 +943,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
if (ret < 0) {
/*
* Note: __vb2_queue_free() will subtract 'allocated_buffers'
- * from q->num_buffers and it will reset q->memory to
+ * from already queued buffers and it will reset q->memory to
* VB2_MEMORY_UNKNOWN.
*/
__vb2_queue_free(q, allocated_buffers);
@@ -973,10 +977,11 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
unsigned int num_planes = 0, num_buffers, allocated_buffers;
unsigned plane_sizes[VB2_MAX_PLANES] = { };
bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
- bool no_previous_buffers = !q->num_buffers;
- int ret;
+ unsigned int q_num_bufs = vb2_get_num_buffers(q);
+ bool no_previous_buffers = !q_num_bufs;
+ int ret = 0;
- if (q->num_buffers == VB2_MAX_FRAME) {
+ if (q_num_bufs == VB2_MAX_FRAME) {
dprintk(q, 1, "maximum number of buffers already allocated\n");
return -ENOBUFS;
}
@@ -1005,7 +1010,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
return -EINVAL;
}
- num_buffers = min(*count, VB2_MAX_FRAME - q->num_buffers);
+ num_buffers = min(*count, VB2_MAX_FRAME - q_num_bufs);
if (requested_planes && requested_sizes) {
num_planes = requested_planes;
@@ -1037,7 +1042,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
num_buffers = allocated_buffers;
/*
- * q->num_buffers contains the total number of buffers, that the
+ * num_buffers contains the total number of buffers, that the
* queue driver has set up
*/
ret = call_qop(q, queue_setup, q, &num_buffers,
@@ -1058,7 +1063,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
if (ret < 0) {
/*
* Note: __vb2_queue_free() will subtract 'allocated_buffers'
- * from q->num_buffers and it will reset q->memory to
+ * from already queued buffers and it will reset q->memory to
* VB2_MEMORY_UNKNOWN.
*/
__vb2_queue_free(q, allocated_buffers);
@@ -1675,7 +1680,7 @@ static int vb2_start_streaming(struct vb2_queue *q)
* Forcefully reclaim buffers if the driver did not
* correctly return them to vb2.
*/
- for (i = 0; i < q->num_buffers; ++i) {
+ for (i = 0; i < vb2_get_num_buffers(q); ++i) {
vb = vb2_get_buffer(q, i);
if (!vb)
@@ -2081,7 +2086,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
* to vb2 in stop_streaming().
*/
if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
- for (i = 0; i < q->num_buffers; ++i) {
+ for (i = 0; i < vb2_get_num_buffers(q); i++) {
struct vb2_buffer *vb = vb2_get_buffer(q, i);
if (!vb)
@@ -2125,7 +2130,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
* call to __fill_user_buffer() after buf_finish(). That order can't
* be changed, so we can't move the buf_finish() to __vb2_dqbuf().
*/
- for (i = 0; i < q->num_buffers; ++i) {
+ for (i = 0; i < vb2_get_num_buffers(q); i++) {
struct vb2_buffer *vb;
struct media_request *req;
@@ -2173,6 +2178,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
int vb2_core_streamon(struct vb2_queue *q, unsigned int type)
{
+ unsigned int q_num_bufs = vb2_get_num_buffers(q);
int ret;
if (type != q->type) {
@@ -2185,12 +2191,12 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int type)
return 0;
}
- if (!q->num_buffers) {
+ if (!q_num_bufs) {
dprintk(q, 1, "no buffers have been allocated\n");
return -EINVAL;
}
- if (q->num_buffers < q->min_buffers_needed) {
+ if (q_num_bufs < q->min_buffers_needed) {
dprintk(q, 1, "need at least %u allocated buffers\n",
q->min_buffers_needed);
return -EINVAL;
@@ -2518,7 +2524,7 @@ void vb2_core_queue_release(struct vb2_queue *q)
__vb2_cleanup_fileio(q);
__vb2_queue_cancel(q);
mutex_lock(&q->mmap_lock);
- __vb2_queue_free(q, q->num_buffers);
+ __vb2_queue_free(q, vb2_get_num_buffers(q));
mutex_unlock(&q->mmap_lock);
}
EXPORT_SYMBOL_GPL(vb2_core_queue_release);
@@ -2547,7 +2553,7 @@ __poll_t vb2_core_poll(struct vb2_queue *q, struct file *file,
/*
* Start file I/O emulator only if streaming API has not been used yet.
*/
- if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) {
+ if (vb2_get_num_buffers(q) == 0 && !vb2_fileio_is_active(q)) {
if (!q->is_output && (q->io_modes & VB2_READ) &&
(req_events & (EPOLLIN | EPOLLRDNORM))) {
if (__vb2_init_fileio(q, 1))
@@ -2585,7 +2591,7 @@ __poll_t vb2_core_poll(struct vb2_queue *q, struct file *file,
* For output streams you can call write() as long as there are fewer
* buffers queued than there are buffers available.
*/
- if (q->is_output && q->fileio && q->queued_count < q->num_buffers)
+ if (q->is_output && q->fileio && q->queued_count < vb2_get_num_buffers(q))
return EPOLLOUT | EPOLLWRNORM;
if (list_empty(&q->done_list)) {
@@ -2634,8 +2640,8 @@ struct vb2_fileio_buf {
* struct vb2_fileio_data - queue context used by file io emulator
*
* @cur_index: the index of the buffer currently being read from or
- * written to. If equal to q->num_buffers then a new buffer
- * must be dequeued.
+ * written to. If equal to number of buffers in the vb2_queue
+ * then a new buffer must be dequeued.
* @initial_index: in the read() case all buffers are queued up immediately
* in __vb2_init_fileio() and __vb2_perform_fileio() just cycles
* buffers. However, in the write() case no buffers are initially
@@ -2645,9 +2651,9 @@ struct vb2_fileio_buf {
* buffers. This means that initially __vb2_perform_fileio()
* needs to know what buffer index to use when it is queuing up
* the buffers for the first time. That initial index is stored
- * in this field. Once it is equal to q->num_buffers all
- * available buffers have been queued and __vb2_perform_fileio()
- * should start the normal dequeue/queue cycle.
+ * in this field. Once it is equal to number of buffers in the
+ * vb2_queue all available buffers have been queued and
+ * __vb2_perform_fileio() should start the normal dequeue/queue cycle.
*
* vb2 provides a compatibility layer and emulator of file io (read and
* write) calls on top of streaming API. For proper operation it required
@@ -2695,7 +2701,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
/*
* Check if streaming api has not been already activated.
*/
- if (q->streaming || q->num_buffers > 0)
+ if (q->streaming || vb2_get_num_buffers(q) > 0)
return -EBUSY;
/*
@@ -2745,7 +2751,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
/*
* Get kernel address of each buffer.
*/
- for (i = 0; i < q->num_buffers; i++) {
+ for (i = 0; i < vb2_get_num_buffers(q); i++) {
/* vb can never be NULL when using fileio. */
vb = vb2_get_buffer(q, i);
@@ -2764,7 +2770,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
/*
* Queue all buffers.
*/
- for (i = 0; i < q->num_buffers; i++) {
+ for (i = 0; i < vb2_get_num_buffers(q); i++) {
struct vb2_buffer *vb2 = vb2_get_buffer(q, i);
if (!vb2)
@@ -2777,10 +2783,10 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
}
/*
* All buffers have been queued, so mark that by setting
- * initial_index to q->num_buffers
+ * initial_index to the number of buffers in the vb2_queue
*/
- fileio->initial_index = q->num_buffers;
- fileio->cur_index = q->num_buffers;
+ fileio->initial_index = vb2_get_num_buffers(q);
+ fileio->cur_index = fileio->initial_index;
}
/*
@@ -2873,7 +2879,7 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_
* Check if we need to dequeue the buffer.
*/
index = fileio->cur_index;
- if (index >= q->num_buffers) {
+ if (index >= vb2_get_num_buffers(q)) {
struct vb2_buffer *b;
/*
@@ -2974,14 +2980,14 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_
* If we are queuing up buffers for the first time, then
* increase initial_index by one.
*/
- if (fileio->initial_index < q->num_buffers)
+ if (fileio->initial_index < vb2_get_num_buffers(q))
fileio->initial_index++;
/*
* The next buffer to use is either a buffer that's going to be
- * queued for the first time (initial_index < q->num_buffers)
- * or it is equal to q->num_buffers, meaning that the next
- * time we need to dequeue a buffer since we've now queued up
- * all the 'first time' buffers.
+ * queued for the first time (initial_index < number of buffers in the vb2_queue)
+ * or it is equal to the number of buffers in the vb2_queue,
+ * meaning that the next time we need to dequeue a buffer since
+ * we've now queued up all the 'first time' buffers.
*/
fileio->cur_index = fileio->initial_index;
}
@@ -3026,7 +3032,7 @@ static int vb2_thread(void *data)
int ret = 0;
if (q->is_output) {
- prequeue = q->num_buffers;
+ prequeue = vb2_get_num_buffers(q);
copy_timestamp = q->copy_timestamp;
}
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 6ba13a95323c..9d3b828cc804 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -621,7 +621,7 @@ struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp)
* This loop doesn't scale if there is a really large number of buffers.
* Maybe something more efficient will be needed in this case.
*/
- for (i = 0; i < q->num_buffers; i++) {
+ for (i = 0; i < vb2_get_num_buffers(q); i++) {
vb2 = vb2_get_buffer(q, i);
if (!vb2)
@@ -755,7 +755,7 @@ 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;
+ create->index = vb2_get_num_buffers(q);
if (create->count == 0)
return ret != -EBUSY ? ret : 0;
--
2.39.2