[PATCH 11/11] media: hantro: Add fdinfo callback

Detlev Casanova
2026-02-12T16:24:30Z

The fdinfo shows the number of buffers in each queue and the total amount
of video buffer memory.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
---
drivers/media/platform/verisilicon/hantro.h | 1 +
drivers/media/platform/verisilicon/hantro_drv.c | 15 +++++++++++++++
drivers/media/platform/verisilicon/hantro_v4l2.c | 10 +++++++++-
3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/verisilicon/hantro.h b/drivers/media/platform/verisilicon/hantro.h
index d5cddc783688..9e9fc0658586 100644
--- a/drivers/media/platform/verisilicon/hantro.h
+++ b/drivers/media/platform/verisilicon/hantro.h
@@ -268,6 +268,7 @@ struct hantro_ctx {
const struct hantro_codec_ops *codec_ops;
struct hantro_postproc_ctx postproc;
bool need_postproc;
+ u64 stats_buf_memory;

/* Specific for particular codec modes. */
union {
diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
index 8dd26ca32459..86d316a8a3e8 100644
--- a/drivers/media/platform/verisilicon/hantro_drv.c
+++ b/drivers/media/platform/verisilicon/hantro_drv.c
@@ -17,6 +17,7 @@
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
+#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/workqueue.h>
@@ -711,6 +712,19 @@ static int hantro_release(struct file *filp)
return 0;
}

+static void hantro_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+ struct hantro_ctx *ctx =
+ container_of(filp->private_data, struct hantro_ctx, fh);
+
+ struct vb2_queue *src_q = v4l2_m2m_get_src_vq(ctx->fh.m2m_ctx);
+ struct vb2_queue *dst_q = v4l2_m2m_get_dst_vq(ctx->fh.m2m_ctx);
+
+ seq_printf(m, "src-queued-count: %04u\n", src_q->queued_count);
+ seq_printf(m, "dst-queued-count: %04u\n", dst_q->queued_count);
+ seq_printf(m, "buf-size: %llu\n", ctx->stats_buf_memory);
+}
+
static const struct v4l2_file_operations hantro_fops = {
.owner = THIS_MODULE,
.open = hantro_open,
@@ -718,6 +732,7 @@ static const struct v4l2_file_operations hantro_fops = {
.poll = v4l2_m2m_fop_poll,
.unlocked_ioctl = video_ioctl2,
.mmap = v4l2_m2m_fop_mmap,
+ .show_fdinfo = hantro_show_fdinfo,
};

static const struct of_device_id of_hantro_match[] = {
diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
index fcf3bd9bcda2..6d129613ea3d 100644
--- a/drivers/media/platform/verisilicon/hantro_v4l2.c
+++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
@@ -820,18 +820,26 @@ hantro_queue_setup(struct vb2_queue *vq, unsigned int *num_buffers,
return -EINVAL;
}

+ ctx->stats_buf_memory = 0;
+
if (*num_planes) {
if (*num_planes != pixfmt->num_planes)
return -EINVAL;
- for (i = 0; i < pixfmt->num_planes; ++i)
+ for (i = 0; i < pixfmt->num_planes; ++i) {
if (sizes[i] < pixfmt->plane_fmt[i].sizeimage)
return -EINVAL;
+ ctx->stats_buf_memory += pixfmt->plane_fmt[i].sizeimage;
+ }
+
+ ctx->stats_buf_memory *= *num_buffers;
+
return 0;
}

*num_planes = pixfmt->num_planes;
for (i = 0; i < pixfmt->num_planes; ++i)
sizes[i] = pixfmt->plane_fmt[i].sizeimage;
+
return 0;
}

--
2.53.0