Message-ID: <d4fb8e3e-d19e-4af5-8a16-8b8b53c3530e@xs4all.nl>
Date: Wed, 13 Nov 2024 08:48:18 +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 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.

>>> +		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();
>>> +	*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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