Re: [PATCHv3] media: venus: provide video device lock

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On 24/05/2023 15:12, Sergey Senozhatsky wrote:
Video device has to provide ->lock so that __video_do_ioctl()
can serialize IOCTL calls. Provided dedicated enc/dec mutex-s
for that purpose.

Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
---
  drivers/media/platform/qcom/venus/core.h | 4 ++++
  drivers/media/platform/qcom/venus/vdec.c | 2 ++
  drivers/media/platform/qcom/venus/venc.c | 2 ++
  3 files changed, 8 insertions(+)

diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index 4f81669986ba..b6c9a653a007 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -113,7 +113,9 @@ struct venus_format {
   * @opp_pmdomain: an OPP power-domain
   * @resets: an array of reset signals
   * @vdev_dec:	a reference to video device structure for decoder instances
+ * @vdev_dec_lock: decoder instance video device ioctl lock
   * @vdev_enc:	a reference to video device structure for encoder instances
+ * @vdev_enc_lock: encoder instance video device ioctl lock
   * @v4l2_dev:	a holder for v4l2 device structure
   * @res:		a reference to venus resources structure
   * @dev:		convenience struct device pointer
@@ -165,7 +167,9 @@ struct venus_core {
  	struct device *opp_pmdomain;
  	struct reset_control *resets[VIDC_RESETS_NUM_MAX];
  	struct video_device *vdev_dec;
+	struct mutex vdev_dec_lock;
  	struct video_device *vdev_enc;
+	struct mutex vdev_enc_lock;
  	struct v4l2_device v4l2_dev;
  	const struct venus_resources *res;
  	struct device *dev;
diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
index 51a53bf82bd3..7e9363714bfb 100644
--- a/drivers/media/platform/qcom/venus/vdec.c
+++ b/drivers/media/platform/qcom/venus/vdec.c
@@ -1760,6 +1760,7 @@ static int vdec_probe(struct platform_device *pdev)
  	if (!vdev)
  		return -ENOMEM;
+ mutex_init(&core->vdev_dec_lock);
  	strscpy(vdev->name, "qcom-venus-decoder", sizeof(vdev->name));
  	vdev->release = video_device_release;
  	vdev->fops = &vdec_fops;
@@ -1767,6 +1768,7 @@ static int vdec_probe(struct platform_device *pdev)
  	vdev->vfl_dir = VFL_DIR_M2M;
  	vdev->v4l2_dev = &core->v4l2_dev;
  	vdev->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
+	vdev->lock = &core->vdev_dec_lock;
ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
  	if (ret)
diff --git a/drivers/media/platform/qcom/venus/venc.c b/drivers/media/platform/qcom/venus/venc.c
index 4666f42feea3..8522ed339d5d 100644
--- a/drivers/media/platform/qcom/venus/venc.c
+++ b/drivers/media/platform/qcom/venus/venc.c
@@ -1558,6 +1558,7 @@ static int venc_probe(struct platform_device *pdev)
  	if (!vdev)
  		return -ENOMEM;
+ mutex_init(&core->vdev_enc_lock);
  	strscpy(vdev->name, "qcom-venus-encoder", sizeof(vdev->name));
  	vdev->release = video_device_release;
  	vdev->fops = &venc_fops;
@@ -1565,6 +1566,7 @@ static int venc_probe(struct platform_device *pdev)
  	vdev->vfl_dir = VFL_DIR_M2M;
  	vdev->v4l2_dev = &core->v4l2_dev;
  	vdev->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
+	vdev->lock = &core->vdev_enc_lock;
ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
  	if (ret)

LGTM

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>



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