Message-ID: <0afd368a-36ed-4415-977b-abf6d245b754@xs4all.nl>
Date: Wed, 13 Nov 2024 10:22:37 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>
Cc: Sebastian Fricke <sebastian.fricke@...labora.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Nicolas Dufresne <nicolas@...fresne.ca>,
 Uwe Kleine-König <u.kleine-koenig@...libre.com>,
 Jianhua Lu <lujianhua000@...il.com>, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 09/28] media: iris: implement reqbuf ioctl with
 vb2_queue_setup

On 13/11/2024 10:00, Dikshita Agarwal wrote:
> 
> 
> On 11/13/2024 1:18 PM, Hans Verkuil wrote:
>> On 13/11/2024 07:19, Dikshita Agarwal wrote:
>>>
>>>
>>> On 11/12/2024 3:20 PM, Hans Verkuil wrote:
>>>> On 05/11/2024 07:55, Dikshita Agarwal wrote:
>>>>> Implement reqbuf IOCTL op and vb2_queue_setup vb2 op in the driver with
>>>>> necessary hooks.
>>>>>
>>>>> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
>>>>> ---
>>
>> <snip>
>>
>>>>> diff --git a/drivers/media/platform/qcom/iris/iris_vb2.c b/drivers/media/platform/qcom/iris/iris_vb2.c
>>>>> new file mode 100644
>>>>> index 000000000000..61033f95cdba
>>>>> --- /dev/null
>>>>> +++ b/drivers/media/platform/qcom/iris/iris_vb2.c
>>>>> @@ -0,0 +1,74 @@
>>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>>> +/*
>>>>> + * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
>>>>> + */
>>>>> +
>>>>> +#include "iris_buffer.h"
>>>>> +#include "iris_instance.h"
>>>>> +#include "iris_vb2.h"
>>>>> +#include "iris_vpu_buffer.h"
>>>>> +
>>>>> +int iris_vb2_queue_setup(struct vb2_queue *q,
>>>>> +			 unsigned int *num_buffers, unsigned int *num_planes,
>>>>> +			 unsigned int sizes[], struct device *alloc_devs[])
>>>>> +{
>>>>> +	enum iris_buffer_type buffer_type = 0;
>>>>> +	struct iris_buffers *buffers;
>>>>> +	struct iris_inst *inst;
>>>>> +	struct iris_core *core;
>>>>> +	struct v4l2_format *f;
>>>>> +	int ret = 0;
>>>>> +
>>>>> +	inst = vb2_get_drv_priv(q);
>>>>> +
>>>>> +	mutex_lock(&inst->lock);
>>>>> +
>>>>> +	core = inst->core;
>>>>> +	f = V4L2_TYPE_IS_OUTPUT(q->type) ? inst->fmt_src : inst->fmt_dst;
>>>>> +
>>>>> +	if (*num_planes) {
>>>>> +		if (*num_planes != f->fmt.pix_mp.num_planes ||
>>>>> +			sizes[0] < f->fmt.pix_mp.plane_fmt[0].sizeimage)
>>>>> +			ret = -EINVAL;
>>>>> +		goto unlock;
>>>>> +	}
>>>>> +
>>>>> +	buffer_type = iris_v4l2_type_to_driver(q->type);
>>>>> +	if (buffer_type == -EINVAL) {
>>>>
>>>> Can this ever fail?
>>>>
>>> If the q->type passed is not supported by driver then it can fail.
>>
>> But it is the driver that sets q->type when the vb2_queue is initialized.
>> So it makes no sense to test it here, it would be a driver bug if this fails.
>>
> Ok, Will remove this check.
>>>>> +		ret = -EINVAL;
>>>>> +		goto unlock;
>>>>> +	}
>>>>> +
>>>>> +	if (!inst->once_per_session_set) {
>>>>> +		inst->once_per_session_set = true;
>>>>> +
>>>>> +		ret = core->hfi_ops->session_open(inst);
>>>>> +		if (ret) {
>>>>> +			ret = -EINVAL;
>>>>> +			dev_err(core->dev, "session open failed\n");
>>>>> +			goto unlock;
>>>>> +		}
>>>>> +	}
>>>>> +
>>>>> +	buffers = &inst->buffers[buffer_type];
>>>>> +	if (!buffers) {
>>>>
>>>> This definitely can never fail.
>>>>
>>> Right, will remove the check.
>>>>> +		ret = -EINVAL;
>>>>> +		goto unlock;
>>>>> +	}
>>>>> +
>>>>> +	buffers->min_count = iris_vpu_buf_count(inst, buffer_type);
>>>>> +	buffers->actual_count = *num_buffers;
>>>>
>>>> Don't mirror the number of buffers in actual_count, instead just always
>>>> ask for the number of buffers using vb2_get_num_buffers().
>>>>
>>>> This code is wrong anyway, since actual_count isn't updated if more
>>>> buffers are added using VIDIOC_CREATEBUFS.
>>>>
>>> Ok, so below would fix the VIDIOC_CREATEBUFS as well, right?
>>> - buffers->actual_count = *num_buffers;
>>> + buffers->actual_count = vb2_get_num_buffers();
> Does this look good?

No. You shouldn't have the actual_count field at all, especially since I see that
you set it in several places. vb2_get_num_buffers() reports the current number of
buffers, which can change if userspace calls VIDIOC_CREATE_BUFS or REMOVE_BUFS.

You shouldn't try to mirror that value yourself. If you need that information,
then call vb2_get_num_buffers().

There are weird things going on in your driver w.r.t. actual_count and also min_count
(and I saw a count_actual as well, very confusing).

I'm not sure what you are trying to achieve, but it doesn't look right.

Regards,

	Hans

> 
> Thanks,
> Dikshita
>>>>> +	*num_planes = 1;
>>>>> +
>>>>> +	buffers->size = iris_get_buffer_size(inst, buffer_type);
>>>>> +
>>>>> +	if (sizes[0] < buffers->size) {
>>>>> +		f->fmt.pix_mp.plane_fmt[0].sizeimage = buffers->size;
>>>>
>>>> Isn't this something that is set in VIDIOC_S_FMT? Can what iris_get_buffer_size
>>>> returns here be different from what VIDIOC_S_FMT does?
>>>>
>>>> This is weird code, I don't think it belong in queue_setup. If iris_get_buffer_size
>>>> can really give a different result, then it needs to be explained carefully, since
>>>> that would be unexpected and possibly non-compliant.
>>>>
>>> I remember adding this particular change to fix a compliance issue.
>>> But when I checked again without this change, compliance is passing now, so
>>> will remove this in next version.
>>
>> Ah, good!
>>
>> Regards,
>>
>> 	Hans
>>
>>>
>>>
>>> Thanks,
>>> Dikshita
>>>>> +		sizes[0] = f->fmt.pix_mp.plane_fmt[0].sizeimage;
>>>>> +	}
>>>>> +
>>>>> +unlock:
>>>>> +	mutex_unlock(&inst->lock);
>>>>> +
>>>>> +	return ret;
>>>>> +}
>>>>> diff --git a/drivers/media/platform/qcom/iris/iris_vb2.h b/drivers/media/platform/qcom/iris/iris_vb2.h
>>>>> new file mode 100644
>>>>> index 000000000000..78157a97b86e
>>>>> --- /dev/null
>>>>> +++ b/drivers/media/platform/qcom/iris/iris_vb2.h
>>>>> @@ -0,0 +1,12 @@
>>>>> +/* SPDX-License-Identifier: GPL-2.0-only */
>>>>> +/*
>>>>> + * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
>>>>> + */
>>>>> +
>>>>> +#ifndef _IRIS_VB2_H_
>>>>> +#define _IRIS_VB2_H_
>>>>> +
>>>>> +int iris_vb2_queue_setup(struct vb2_queue *q,
>>>>> +			 unsigned int *num_buffers, unsigned int *num_planes,
>>>>> +			 unsigned int sizes[], struct device *alloc_devs[]);
>>>>> +#endif
>>>>> diff --git a/drivers/media/platform/qcom/iris/iris_vdec.c b/drivers/media/platform/qcom/iris/iris_vdec.c
>>>>> new file mode 100644
>>>>> index 000000000000..7d1ef31c7c44
>>>>> --- /dev/null
>>>>> +++ b/drivers/media/platform/qcom/iris/iris_vdec.c
>>>>> @@ -0,0 +1,58 @@
>>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>>> +/*
>>>>> + * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
>>>>> + */
>>>>> +
>>>>> +#include "iris_buffer.h"
>>>>> +#include "iris_instance.h"
>>>>> +#include "iris_vdec.h"
>>>>> +#include "iris_vpu_buffer.h"
>>>>> +
>>>>> +#define DEFAULT_WIDTH 320
>>>>> +#define DEFAULT_HEIGHT 240
>>>>> +
>>>>> +void iris_vdec_inst_init(struct iris_inst *inst)
>>>>> +{
>>>>> +	struct v4l2_format *f;
>>>>> +
>>>>> +	inst->fmt_src  = kzalloc(sizeof(*inst->fmt_src), GFP_KERNEL);
>>>>> +	inst->fmt_dst  = kzalloc(sizeof(*inst->fmt_dst), GFP_KERNEL);
>>>>> +
>>>>> +	inst->fw_min_count = MIN_BUFFERS;
>>>>> +
>>>>> +	f = inst->fmt_src;
>>>>> +	f->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
>>>>> +	f->fmt.pix_mp.width = DEFAULT_WIDTH;
>>>>> +	f->fmt.pix_mp.height = DEFAULT_HEIGHT;
>>>>> +	f->fmt.pix_mp.pixelformat = V4L2_PIX_FMT_H264;
>>>>> +	f->fmt.pix_mp.num_planes = 1;
>>>>> +	f->fmt.pix_mp.plane_fmt[0].bytesperline = 0;
>>>>> +	f->fmt.pix_mp.plane_fmt[0].sizeimage = iris_get_buffer_size(inst, BUF_INPUT);
>>>>> +	f->fmt.pix_mp.field = V4L2_FIELD_NONE;
>>>>> +	inst->buffers[BUF_INPUT].min_count = iris_vpu_buf_count(inst, BUF_INPUT);
>>>>> +	inst->buffers[BUF_INPUT].actual_count = inst->buffers[BUF_INPUT].min_count;
>>>>> +	inst->buffers[BUF_INPUT].size = f->fmt.pix_mp.plane_fmt[0].sizeimage;
>>>>> +
>>>>> +	f = inst->fmt_dst;
>>>>> +	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
>>>>> +	f->fmt.pix_mp.pixelformat = V4L2_PIX_FMT_NV12;
>>>>> +	f->fmt.pix_mp.width = ALIGN(DEFAULT_WIDTH, 128);
>>>>> +	f->fmt.pix_mp.height = ALIGN(DEFAULT_HEIGHT, 32);
>>>>> +	f->fmt.pix_mp.num_planes = 1;
>>>>> +	f->fmt.pix_mp.plane_fmt[0].bytesperline = ALIGN(DEFAULT_WIDTH, 128);
>>>>> +	f->fmt.pix_mp.plane_fmt[0].sizeimage = iris_get_buffer_size(inst, BUF_OUTPUT);
>>>>> +	f->fmt.pix_mp.field = V4L2_FIELD_NONE;
>>>>> +	f->fmt.pix_mp.colorspace = V4L2_COLORSPACE_DEFAULT;
>>>>> +	f->fmt.pix_mp.xfer_func = V4L2_XFER_FUNC_DEFAULT;
>>>>> +	f->fmt.pix_mp.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
>>>>> +	f->fmt.pix_mp.quantization = V4L2_QUANTIZATION_DEFAULT;
>>>>> +	inst->buffers[BUF_OUTPUT].min_count = iris_vpu_buf_count(inst, BUF_OUTPUT);
>>>>> +	inst->buffers[BUF_OUTPUT].actual_count = inst->buffers[BUF_OUTPUT].min_count;
>>>>> +	inst->buffers[BUF_OUTPUT].size = f->fmt.pix_mp.plane_fmt[0].sizeimage;
>>>>> +}
>>>>> +
>>>>> +void iris_vdec_inst_deinit(struct iris_inst *inst)
>>>>> +{
>>>>> +	kfree(inst->fmt_dst);
>>>>> +	kfree(inst->fmt_src);
>>>>> +}
>>>>> diff --git a/drivers/media/platform/qcom/iris/iris_vdec.h b/drivers/media/platform/qcom/iris/iris_vdec.h
>>>>> new file mode 100644
>>>>> index 000000000000..0324d7f796dd
>>>>> --- /dev/null
>>>>> +++ b/drivers/media/platform/qcom/iris/iris_vdec.h
>>>>> @@ -0,0 +1,14 @@
>>>>> +/* SPDX-License-Identifier: GPL-2.0-only */
>>>>> +/*
>>>>> + * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
>>>>> + */
>>>>> +
>>>>> +#ifndef _IRIS_VDEC_H_
>>>>> +#define _IRIS_VDEC_H_
>>>>> +
>>>>> +struct iris_inst;
>>>>> +
>>>>> +void iris_vdec_inst_init(struct iris_inst *inst);
>>>>> +void iris_vdec_inst_deinit(struct iris_inst *inst);
>>>>> +
>>>>> +#endif
>>>>> diff --git a/drivers/media/platform/qcom/iris/iris_vidc.c b/drivers/media/platform/qcom/iris/iris_vidc.c
>>>>> index b8654e73f516..ab3b63171c1d 100644
>>>>> --- a/drivers/media/platform/qcom/iris/iris_vidc.c
>>>>> +++ b/drivers/media/platform/qcom/iris/iris_vidc.c
>>>>> @@ -9,6 +9,9 @@
>>>>>  
>>>>>  #include "iris_vidc.h"
>>>>>  #include "iris_instance.h"
>>>>> +#include "iris_vdec.h"
>>>>> +#include "iris_vb2.h"
>>>>> +#include "iris_vpu_buffer.h"
>>>>>  #include "iris_platform_common.h"
>>>>>  
>>>>>  #define IRIS_DRV_NAME "iris_driver"
>>>>> @@ -28,6 +31,38 @@ static void iris_v4l2_fh_deinit(struct iris_inst *inst)
>>>>>  	v4l2_fh_exit(&inst->fh);
>>>>>  }
>>>>>  
>>>>> +static void iris_add_session(struct iris_inst *inst)
>>>>> +{
>>>>> +	struct iris_core *core = inst->core;
>>>>> +	struct iris_inst *iter;
>>>>> +	u32 count = 0;
>>>>> +
>>>>> +	mutex_lock(&core->lock);
>>>>> +
>>>>> +	list_for_each_entry(iter, &core->instances, list)
>>>>> +		count++;
>>>>> +
>>>>> +	if (count < core->iris_platform_data->max_session_count)
>>>>> +		list_add_tail(&inst->list, &core->instances);
>>>>> +
>>>>> +	mutex_unlock(&core->lock);
>>>>> +}
>>>>> +
>>>>> +static void iris_remove_session(struct iris_inst *inst)
>>>>> +{
>>>>> +	struct iris_core *core = inst->core;
>>>>> +	struct iris_inst *iter, *temp;
>>>>> +
>>>>> +	mutex_lock(&core->lock);
>>>>> +	list_for_each_entry_safe(iter, temp, &core->instances, list) {
>>>>> +		if (iter->session_id == inst->session_id) {
>>>>> +			list_del_init(&iter->list);
>>>>> +			break;
>>>>> +		}
>>>>> +	}
>>>>> +	mutex_unlock(&core->lock);
>>>>> +}
>>>>> +
>>>>>  static inline struct iris_inst *iris_get_inst(struct file *filp, void *fh)
>>>>>  {
>>>>>  	return container_of(filp->private_data, struct iris_inst, fh);
>>>>> @@ -59,7 +94,10 @@ iris_m2m_queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_
>>>>>  	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
>>>>>  	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
>>>>>  	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
>>>>> +	src_vq->ops = inst->core->iris_vb2_ops;
>>>>>  	src_vq->drv_priv = inst;
>>>>> +	src_vq->buf_struct_size = sizeof(struct iris_buffer);
>>>>> +	src_vq->min_reqbufs_allocation = MIN_BUFFERS;
>>>>>  	src_vq->dev = inst->core->dev;
>>>>>  	src_vq->lock = &inst->ctx_q_lock;
>>>>>  	ret = vb2_queue_init(src_vq);
>>>>> @@ -69,7 +107,10 @@ iris_m2m_queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_
>>>>>  	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
>>>>>  	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
>>>>>  	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
>>>>> +	dst_vq->ops = inst->core->iris_vb2_ops;
>>>>>  	dst_vq->drv_priv = inst;
>>>>> +	dst_vq->buf_struct_size = sizeof(struct iris_buffer);
>>>>> +	dst_vq->min_reqbufs_allocation = MIN_BUFFERS;
>>>>>  	dst_vq->dev = inst->core->dev;
>>>>>  	dst_vq->lock = &inst->ctx_q_lock;
>>>>>  
>>>>> @@ -100,8 +141,11 @@ int iris_open(struct file *filp)
>>>>>  		return -ENOMEM;
>>>>>  
>>>>>  	inst->core = core;
>>>>> +	inst->session_id = hash32_ptr(inst);
>>>>>  
>>>>> +	mutex_init(&inst->lock);
>>>>>  	mutex_init(&inst->ctx_q_lock);
>>>>> +	init_completion(&inst->completion);
>>>>>  
>>>>>  	iris_v4l2_fh_init(inst);
>>>>>  
>>>>> @@ -117,6 +161,10 @@ int iris_open(struct file *filp)
>>>>>  		goto fail_m2m_release;
>>>>>  	}
>>>>>  
>>>>> +	iris_vdec_inst_init(inst);
>>>>> +
>>>>> +	iris_add_session(inst);
>>>>> +
>>>>>  	inst->fh.m2m_ctx = inst->m2m_ctx;
>>>>>  	filp->private_data = &inst->fh;
>>>>>  
>>>>> @@ -127,19 +175,42 @@ int iris_open(struct file *filp)
>>>>>  fail_v4l2_fh_deinit:
>>>>>  	iris_v4l2_fh_deinit(inst);
>>>>>  	mutex_destroy(&inst->ctx_q_lock);
>>>>> +	mutex_destroy(&inst->lock);
>>>>>  	kfree(inst);
>>>>>  
>>>>>  	return ret;
>>>>>  }
>>>>>  
>>>>> +static void iris_session_close(struct iris_inst *inst)
>>>>> +{
>>>>> +	const struct iris_hfi_command_ops *hfi_ops = inst->core->hfi_ops;
>>>>> +	bool wait_for_response = true;
>>>>> +	int ret;
>>>>> +
>>>>> +	reinit_completion(&inst->completion);
>>>>> +
>>>>> +	ret = hfi_ops->session_close(inst);
>>>>> +	if (ret)
>>>>> +		wait_for_response = false;
>>>>> +
>>>>> +	if (wait_for_response)
>>>>> +		iris_wait_for_session_response(inst);
>>>>> +}
>>>>> +
>>>>>  int iris_close(struct file *filp)
>>>>>  {
>>>>>  	struct iris_inst *inst = iris_get_inst(filp, NULL);
>>>>>  
>>>>>  	v4l2_m2m_ctx_release(inst->m2m_ctx);
>>>>>  	v4l2_m2m_release(inst->m2m_dev);
>>>>> +	mutex_lock(&inst->lock);
>>>>> +	iris_vdec_inst_deinit(inst);
>>>>> +	iris_session_close(inst);
>>>>>  	iris_v4l2_fh_deinit(inst);
>>>>> +	iris_remove_session(inst);
>>>>> +	mutex_unlock(&inst->lock);
>>>>>  	mutex_destroy(&inst->ctx_q_lock);
>>>>> +	mutex_destroy(&inst->lock);
>>>>>  	kfree(inst);
>>>>>  	filp->private_data = NULL;
>>>>>  
>>>>> @@ -155,7 +226,17 @@ static struct v4l2_file_operations iris_v4l2_file_ops = {
>>>>>  	.mmap                           = v4l2_m2m_fop_mmap,
>>>>>  };
>>>>>  
>>>>> +static const struct vb2_ops iris_vb2_ops = {
>>>>> +	.queue_setup                    = iris_vb2_queue_setup,
>>>>> +};
>>>>> +
>>>>> +static const struct v4l2_ioctl_ops iris_v4l2_ioctl_ops = {
>>>>> +	.vidioc_reqbufs                 = v4l2_m2m_ioctl_reqbufs,
>>>>> +};
>>>>> +
>>>>>  void iris_init_ops(struct iris_core *core)
>>>>>  {
>>>>>  	core->iris_v4l2_file_ops = &iris_v4l2_file_ops;
>>>>> +	core->iris_vb2_ops = &iris_vb2_ops;
>>>>> +	core->iris_v4l2_ioctl_ops = &iris_v4l2_ioctl_ops;
>>>>>  }
>>>>> diff --git a/drivers/media/platform/qcom/iris/iris_vpu_buffer.c b/drivers/media/platform/qcom/iris/iris_vpu_buffer.c
>>>>> new file mode 100644
>>>>> index 000000000000..2402a33723ab
>>>>> --- /dev/null
>>>>> +++ b/drivers/media/platform/qcom/iris/iris_vpu_buffer.c
>>>>> @@ -0,0 +1,19 @@
>>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>>> +/*
>>>>> + * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
>>>>> + */
>>>>> +
>>>>> +#include "iris_instance.h"
>>>>> +#include "iris_vpu_buffer.h"
>>>>> +
>>>>> +int iris_vpu_buf_count(struct iris_inst *inst, enum iris_buffer_type buffer_type)
>>>>> +{
>>>>> +	switch (buffer_type) {
>>>>> +	case BUF_INPUT:
>>>>> +		return MIN_BUFFERS;
>>>>> +	case BUF_OUTPUT:
>>>>> +		return inst->fw_min_count;
>>>>> +	default:
>>>>> +		return 0;
>>>>> +	}
>>>>> +}
>>>>> diff --git a/drivers/media/platform/qcom/iris/iris_vpu_buffer.h b/drivers/media/platform/qcom/iris/iris_vpu_buffer.h
>>>>> new file mode 100644
>>>>> index 000000000000..f0f974cebd8a
>>>>> --- /dev/null
>>>>> +++ b/drivers/media/platform/qcom/iris/iris_vpu_buffer.h
>>>>> @@ -0,0 +1,15 @@
>>>>> +/* SPDX-License-Identifier: GPL-2.0-only */
>>>>> +/*
>>>>> + * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
>>>>> + */
>>>>> +
>>>>> +#ifndef _IRIS_VPU_BUFFER_H_
>>>>> +#define _IRIS_VPU_BUFFER_H_
>>>>> +
>>>>> +struct iris_inst;
>>>>> +
>>>>> +#define MIN_BUFFERS			4
>>>>> +
>>>>> +int iris_vpu_buf_count(struct iris_inst *inst, enum iris_buffer_type buffer_type);
>>>>> +
>>>>> +#endif
>>>>>
>>>>
>>>> Regards,
>>>>
>>>> 	Hans
>>

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