Date:   Tue, 16 Apr 2019 12:17:32 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     André Almeida <andrealmeid@...labora.com>,
        linux-media@...r.kernel.org
Cc:     mchehab@...nel.org, hverkuil@...all.nl, lucmaga@...il.com,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        lkcamp@...ts.libreplanetbr.org
Subject: Re: [PATCH v2 11/15] media: vimc: Add and use new struct vimc_frame

Hi André,

Thanks for the patch, just some comments bellow.

On 3/27/19 12:17 PM, André Almeida wrote:
> Struct vimc_frame is intended to hold metadata about a frame,
> such as memory address of a plane, number of planes and size
> of each plane, to better integrated with the multiplanar operations.
> The struct can be also used with singleplanar formats, making the
> implementation of frame manipulation generic for both type of
> formats.
> 
> vimc_fill_frame function fills a vimc_frame structure given a
> pixelformat, height and width. This is done once to avoid recalculations
> and provide enough information to subdevices work with
> the frame.
> 
> Change the return and argument type of process_frame from void* to
> vimc_frame*. Change the frame in subdevices structs from u8* to vimc_frame.
> 
> Signed-off-by: André Almeida <andrealmeid@...labora.com>
> ---
> Change in v2:
> - Fix alignment issues
> 
>  drivers/media/platform/vimc/vimc-capture.c  |  6 +--
>  drivers/media/platform/vimc/vimc-common.c   | 36 +++++++++++++++
>  drivers/media/platform/vimc/vimc-common.h   | 49 +++++++++++++++++++--
>  drivers/media/platform/vimc/vimc-debayer.c  | 34 +++++++-------
>  drivers/media/platform/vimc/vimc-scaler.c   | 26 ++++++-----
>  drivers/media/platform/vimc/vimc-sensor.c   | 18 ++++----
>  drivers/media/platform/vimc/vimc-streamer.c |  2 +-
>  7 files changed, 127 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/media/platform/vimc/vimc-capture.c b/drivers/media/platform/vimc/vimc-capture.c
> index 3c93fbd51629..fae42b778711 100644
> --- a/drivers/media/platform/vimc/vimc-capture.c
> +++ b/drivers/media/platform/vimc/vimc-capture.c
> @@ -600,8 +600,8 @@ static void vimc_cap_comp_unbind(struct device *comp, struct device *master,
>  	video_unregister_device(&vcap->vdev);
>  }
>  
> -static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
> -				    const void *frame)
> +static struct vimc_frame *vimc_cap_process_frame(struct vimc_ent_device *ved,
> +						 const struct vimc_frame *frame)
>  {
>  	struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
>  						    ved);
> @@ -630,7 +630,7 @@ static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
>  
>  	vbuf = vb2_plane_vaddr(&vimc_buf->vb2.vb2_buf, 0);
>  
> -	memcpy(vbuf, frame, vcap->format.fmt.pix.sizeimage);
> +	memcpy(vbuf, frame->plane_addr[0], vcap->format.fmt.pix.sizeimage);
>  
>  	/* Set it as ready */
>  	vb2_set_plane_payload(&vimc_buf->vb2.vb2_buf, 0,
> diff --git a/drivers/media/platform/vimc/vimc-common.c b/drivers/media/platform/vimc/vimc-common.c
> index 8d314b5dbb73..26868a753c53 100644
> --- a/drivers/media/platform/vimc/vimc-common.c
> +++ b/drivers/media/platform/vimc/vimc-common.c
> @@ -380,6 +380,42 @@ int vimc_ent_sd_register(struct vimc_ent_device *ved,
>  }
>  EXPORT_SYMBOL_GPL(vimc_ent_sd_register);
>  
> +void vimc_fill_frame(struct vimc_frame *frame, u32 pixelformat, u32 width,
> +		     u32 height, bool multiplanar)
> +{
> +	unsigned int i;
> +	const struct v4l2_format_info *pix_info;
> +
> +	pix_info = v4l2_format_info(pixelformat);
> +	frame->pixelformat = pixelformat;
> +
> +	if (multiplanar) {
> +		struct v4l2_pix_format_mplane pix_fmt_mp;
> +
> +		v4l2_fill_pixfmt_mp(&pix_fmt_mp, pixelformat, width, height);
> +
> +		frame->num_planes = pix_fmt_mp.num_planes;
> +		for (i = 0; i < pix_fmt_mp.num_planes; i++) {
> +			frame->sizeimage[i] = pix_fmt_mp.plane_fmt[i].sizeimage;
> +			frame->bytesperline[i] =
> +				pix_fmt_mp.plane_fmt[i].bytesperline;
> +			frame->bpp[i] = pix_info->bpp[i];
> +			frame->plane_addr[i] = NULL;
> +		}
> +	} else {
> +		struct v4l2_pix_format pix_fmt;
> +
> +		v4l2_fill_pixfmt(&pix_fmt, pixelformat, width, height);
> +
> +		frame->num_planes = 1;
> +		frame->sizeimage[0] = pix_fmt.sizeimage;
> +		frame->bytesperline[0] = pix_fmt.bytesperline;
> +		frame->bpp[0] = pix_info->bpp[0];
> +		frame->plane_addr[0] = NULL;
> +	}
> +}
> +EXPORT_SYMBOL_GPL(vimc_fill_frame);
> +
>  void vimc_ent_sd_unregister(struct vimc_ent_device *ved, struct v4l2_subdev *sd)
>  {
>  	media_entity_cleanup(ved->ent);
> diff --git a/drivers/media/platform/vimc/vimc-common.h b/drivers/media/platform/vimc/vimc-common.h
> index 142ddfa69b3d..7d167dd696ca 100644
> --- a/drivers/media/platform/vimc/vimc-common.h
> +++ b/drivers/media/platform/vimc/vimc-common.h
> @@ -21,6 +21,7 @@
>  #include <linux/slab.h>
>  #include <media/media-device.h>
>  #include <media/v4l2-device.h>
> +#include <media/tpg/v4l2-tpg.h>
>  
>  #include "vimc-streamer.h"
>  
> @@ -79,6 +80,31 @@ struct vimc_platform_data {
>  	char entity_name[32];
>  };
>  
> +/**
> + * struct vimc_frame - metadata about frame components
> + *
> + * @pixelformat:	fourcc pixelformat code
> + * @plane_addr:		pointer to kernel address of the plane
> + * @num_planes:		number of valid planes on a frame
> + * @sizeimage:		size in bytes of a plane
> + * @bytesperline:	number of bytes per line of a plane
> + * @bpp:		number of bytes per pixel of a plane

Please, re-order the variable docs in the same order declared in the struct.

> + *
> + * This struct helps subdevices to get information about the frame on
> + * multiplanar formats. If a singleplanar format is used, only the first
> + * index of each array is used and num_planes is set to 1, so the
> + * implementation is generic and the code will work for both formats.
> + */
> +
> +struct vimc_frame {
> +	u32 pixelformat;
> +	u32 sizeimage[TPG_MAX_PLANES];
> +	u32 bytesperline[TPG_MAX_PLANES];
> +	u8 *plane_addr[TPG_MAX_PLANES];
> +	u8 bpp[TPG_MAX_PLANES];

any particular reason not to use unsigned int here?

> +	u8 num_planes;

same here.

Usually we use u8, u16, u32, s8, s16, etc, if we have some specific
requirement to keep the data size (because of some API, protocol, or if
the hardware requires it).

The main reason, afaik, is that int is more efficient for the processor.
In some architectures the cpu doesn't know how to deal with a byte
directly, just with a word, so if you use u8, it means the processor
will read a word and then do a mask, making it less efficient (and
sometimes making the code bigger if done by the compiler).

Another thing that just occurred to me, instead of adding those fields
in vimc_frame, what do you think of having just:

struct vimc_frame {
	struct v4l2_format fmt;
	u8 *plane_addr[TPG_MAX_PLANES];
};

So you wouldn't need the vimc_fil_frame.

You could also just work with multiplanar, and convert to single planar
in the capture:

struct vimc_frame {
	struct v4l2_pix_format_mplane fmt;
	u8 *plane_addr[TPG_MAX_PLANES];
};

So the subdevices can just work with multiplanar (they doesn't need to
know how to deal with single planar, just multiplanar with num_plane=1),
and the capture can make the conversion if required.

Helen

> +};
> +
>  /**
>   * struct vimc_ent_device - core struct that represents a node in the topology
>   *
> @@ -101,10 +127,10 @@ struct vimc_ent_device {
>  	struct media_entity *ent;
>  	struct media_pad *pads;
>  	struct vimc_stream *stream;
> -	void * (*process_frame)(struct vimc_ent_device *ved,
> -				const void *frame);
> +	struct vimc_frame * (*process_frame)(struct vimc_ent_device *ved,
> +				const struct vimc_frame *frame);
>  	void (*vdev_get_format)(struct vimc_ent_device *ved,
> -			      struct v4l2_pix_format *fmt);
> +				struct v4l2_pix_format *fmt);
>  };
>  
>  /**
> @@ -206,4 +232,21 @@ void vimc_ent_sd_unregister(struct vimc_ent_device *ved,
>   */
>  int vimc_link_validate(struct media_link *link);
>  
> +/**
> + * vimc_fill_frame - fills struct vimc_frame
> + *
> + * @frame: pointer to the frame to be filled
> + * @pixelformat: pixelformat fourcc code
> + * @width: width of the image
> + * @height: height of the image
> + * @multiplanar: flag to define if the stream is in singleplanar/multiplanar
> + * mode
> + *
> + * This function fills the fields of vimc_frame in order to subdevs have
> + * information about the frame being processed, works both for single
> + * and multiplanar pixel formats.
> + */
> +void vimc_fill_frame(struct vimc_frame *frame, u32 pixelformat, u32 width,
> +		     u32 height, bool multiplanar);
> +
>  #endif
> diff --git a/drivers/media/platform/vimc/vimc-debayer.c b/drivers/media/platform/vimc/vimc-debayer.c
> index 613b7abbe06e..c2fb1fab7fe9 100644
> --- a/drivers/media/platform/vimc/vimc-debayer.c
> +++ b/drivers/media/platform/vimc/vimc-debayer.c
> @@ -62,7 +62,7 @@ struct vimc_deb_device {
>  	void (*set_rgb_src)(struct vimc_deb_device *vdeb, unsigned int lin,
>  			    unsigned int col, unsigned int rgb[3]);
>  	/* Values calculated when the stream starts */
> -	u8 *src_frame;
> +	struct vimc_frame src_frame;
>  	const struct vimc_deb_pix_map *sink_pix_map;
>  	unsigned int sink_bpp;
>  };
> @@ -325,7 +325,7 @@ static void vimc_deb_set_rgb_pix_rgb24(struct vimc_deb_device *vdeb,
>  
>  	index = VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 3);
>  	for (i = 0; i < 3; i++)
> -		vdeb->src_frame[index + i] = rgb[i];
> +		vdeb->src_frame.plane_addr[0][index + i] = rgb[i];
>  }
>  
>  static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
> @@ -335,7 +335,6 @@ static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
>  	if (enable) {
>  		u32 src_pixelformat = vdeb->ved.stream->producer_pixfmt;
>  		const struct v4l2_format_info *pix_info;
> -		unsigned int frame_size;
>  
>  		/* We only support translating bayer to RGB24 */
>  		if (src_pixelformat != V4L2_PIX_FMT_RGB24) {
> @@ -354,9 +353,9 @@ static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
>  			vdeb->sink_pix_map->pixelformat;
>  
>  		/* Calculate frame_size of the source */
> -		pix_info = v4l2_format_info(src_pixelformat);
> -		frame_size = vdeb->sink_fmt.width * vdeb->sink_fmt.height *
> -			     pix_info->bpp[0];
> +		vimc_fill_frame(&vdeb->src_frame, src_pixelformat,
> +				vdeb->sink_fmt.width, vdeb->sink_fmt.height,
> +				vdeb->ved.stream->producer_pixfmt);
>  
>  		/* Get bpp from the sink */
>  		pix_info = v4l2_format_info(vdeb->sink_pix_map->pixelformat);
> @@ -366,16 +365,18 @@ static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable)
>  		 * Allocate the frame buffer. Use vmalloc to be able to
>  		 * allocate a large amount of memory
>  		 */
> -		vdeb->src_frame = vmalloc(frame_size);
> -		if (!vdeb->src_frame)
> +		vdeb->src_frame.plane_addr[0] =
> +					vmalloc(vdeb->src_frame.sizeimage[0]);
> +		if (!vdeb->src_frame.plane_addr[0])
>  			return -ENOMEM;
>  
> +
>  	} else {
> -		if (!vdeb->src_frame)
> +		if (!vdeb->src_frame.plane_addr[0])
>  			return 0;
>  
> -		vfree(vdeb->src_frame);
> -		vdeb->src_frame = NULL;
> +		vfree(vdeb->src_frame.plane_addr[0]);
> +		vdeb->src_frame.plane_addr[0] = NULL;
>  	}
>  
>  	return 0;
> @@ -487,8 +488,8 @@ static void vimc_deb_calc_rgb_sink(struct vimc_deb_device *vdeb,
>  	}
>  }
>  
> -static void *vimc_deb_process_frame(struct vimc_ent_device *ved,
> -				    const void *sink_frame)
> +static struct vimc_frame *vimc_deb_process_frame(struct vimc_ent_device *ved,
> +					const struct vimc_frame *sink_frame)
>  {
>  	struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,
>  						    ved);
> @@ -496,16 +497,17 @@ static void *vimc_deb_process_frame(struct vimc_ent_device *ved,
>  	unsigned int i, j;
>  
>  	/* If the stream in this node is not active, just return */
> -	if (!vdeb->src_frame)
> +	if (!vdeb->src_frame.plane_addr[0])
>  		return ERR_PTR(-EINVAL);
>  
>  	for (i = 0; i < vdeb->sink_fmt.height; i++)
>  		for (j = 0; j < vdeb->sink_fmt.width; j++) {
> -			vimc_deb_calc_rgb_sink(vdeb, sink_frame, i, j, rgb);
> +			vimc_deb_calc_rgb_sink(vdeb, sink_frame->plane_addr[0],
> +					       i, j, rgb);
>  			vdeb->set_rgb_src(vdeb, i, j, rgb);
>  		}
>  
> -	return vdeb->src_frame;
> +	return &vdeb->src_frame;
>  
>  }
>  
> diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
> index 8544c745c6e6..92c639f1817e 100644
> --- a/drivers/media/platform/vimc/vimc-scaler.c
> +++ b/drivers/media/platform/vimc/vimc-scaler.c
> @@ -50,7 +50,7 @@ struct vimc_sca_device {
>  	 */
>  	struct v4l2_mbus_framefmt sink_fmt;
>  	/* Values calculated when the stream starts */
> -	u8 *src_frame;
> +	struct vimc_frame src_frame;
>  	unsigned int src_line_size;
>  	unsigned int bpp;
>  };
> @@ -234,16 +234,17 @@ static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
>  		/* Allocate the frame buffer. Use vmalloc to be able to
>  		 * allocate a large amount of memory
>  		 */
> -		vsca->src_frame = vmalloc(frame_size);
> -		if (!vsca->src_frame)
> +		vsca->src_frame.plane_addr[0] = vmalloc(frame_size);
> +		vsca->src_frame.sizeimage[0] = frame_size;
> +		if (!vsca->src_frame.plane_addr[0])
>  			return -ENOMEM;
>  
>  	} else {
> -		if (!vsca->src_frame)
> +		if (!vsca->src_frame.plane_addr[0])
>  			return 0;
>  
> -		vfree(vsca->src_frame);
> -		vsca->src_frame = NULL;
> +		vfree(vsca->src_frame.plane_addr[0]);
> +		vsca->src_frame.plane_addr[0] = NULL;
>  	}
>  
>  	return 0;
> @@ -306,8 +307,9 @@ static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
>  				vsca->sd.name, index + j);
>  
>  			/* copy the pixel to the position index + j */
> -			vimc_sca_fill_pix(&vsca->src_frame[index + j],
> -					  pixel, vsca->bpp);
> +			vimc_sca_fill_pix(
> +				&vsca->src_frame.plane_addr[0][index + j],
> +				pixel, vsca->bpp);
>  		}
>  
>  		/* move the index to the next line */
> @@ -327,8 +329,8 @@ static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
>  			vimc_sca_scale_pix(vsca, i, j, sink_frame);
>  }
>  
> -static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
> -				    const void *sink_frame)
> +static struct vimc_frame *vimc_sca_process_frame(struct vimc_ent_device *ved,
> +				    const struct vimc_frame *sink_frame)
>  {
>  	struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
>  						    ved);
> @@ -337,9 +339,9 @@ static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
>  	if (!ved->stream)
>  		return ERR_PTR(-EINVAL);
>  
> -	vimc_sca_fill_src_frame(vsca, sink_frame);
> +	vimc_sca_fill_src_frame(vsca, sink_frame->plane_addr[0]);
>  
> -	return vsca->src_frame;
> +	return &vsca->src_frame;
>  };
>  
>  static void vimc_sca_release(struct v4l2_subdev *sd)
> diff --git a/drivers/media/platform/vimc/vimc-sensor.c b/drivers/media/platform/vimc/vimc-sensor.c
> index 1b2b75b27952..3495a3f3dd60 100644
> --- a/drivers/media/platform/vimc/vimc-sensor.c
> +++ b/drivers/media/platform/vimc/vimc-sensor.c
> @@ -36,7 +36,7 @@ struct vimc_sen_device {
>  	struct device *dev;
>  	struct tpg_data tpg;
>  	struct task_struct *kthread_sen;
> -	u8 *frame;
> +	struct vimc_frame frame;
>  	/* The active format */
>  	struct v4l2_mbus_framefmt mbus_format;
>  	struct v4l2_ctrl_handler hdl;
> @@ -177,14 +177,14 @@ static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {
>  	.set_fmt		= vimc_sen_set_fmt,
>  };
>  
> -static void *vimc_sen_process_frame(struct vimc_ent_device *ved,
> -				    const void *sink_frame)
> +static struct vimc_frame *vimc_sen_process_frame(struct vimc_ent_device *ved,
> +				    const struct vimc_frame *sink_frame)
>  {
>  	struct vimc_sen_device *vsen = container_of(ved, struct vimc_sen_device,
>  						    ved);
>  
> -	tpg_fill_plane_buffer(&vsen->tpg, 0, 0, vsen->frame);
> -	return vsen->frame;
> +	tpg_fill_plane_buffer(&vsen->tpg, 0, 0, vsen->frame.plane_addr[0]);
> +	return &vsen->frame;
>  }
>  
>  static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
> @@ -206,8 +206,8 @@ static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
>  		 * Allocate the frame buffer. Use vmalloc to be able to
>  		 * allocate a large amount of memory
>  		 */
> -		vsen->frame = vmalloc(frame_size);
> -		if (!vsen->frame)
> +		vsen->frame.plane_addr[0] = vmalloc(frame_size);
> +		if (!vsen->frame.plane_addr[0])
>  			return -ENOMEM;
>  
>  		/* configure the test pattern generator */
> @@ -215,8 +215,8 @@ static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
>  
>  	} else {
>  
> -		vfree(vsen->frame);
> -		vsen->frame = NULL;
> +		vfree(vsen->frame.plane_addr[0]);
> +		vsen->frame.plane_addr[0] = NULL;
>  		return 0;
>  	}
>  
> diff --git a/drivers/media/platform/vimc/vimc-streamer.c b/drivers/media/platform/vimc/vimc-streamer.c
> index 26b674259489..216ac8a83ba5 100644
> --- a/drivers/media/platform/vimc/vimc-streamer.c
> +++ b/drivers/media/platform/vimc/vimc-streamer.c
> @@ -125,7 +125,7 @@ static int vimc_streamer_pipeline_init(struct vimc_stream *stream,
>  static int vimc_streamer_thread(void *data)
>  {
>  	struct vimc_stream *stream = data;
> -	u8 *frame = NULL;
> +	struct vimc_frame *frame = NULL;
>  	int i;
>  
>  	set_freezable();
> 

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