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Date: Fri, 26 Feb 2021 16:20:13 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Rahul Gottipati <rahul.blr97@...il.com>,
linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: atomisp: reduce kernel stack usage
On Fri, Feb 26, 2021 at 03:05:02PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> The atomisp_set_fmt() function has multiple copies of the large
> v4l2_format structure on its stack, resulting in a warning about
> excessive stack usage in some rare randconfig builds.
>
> drivers/staging/media/atomisp/pci/atomisp_cmd.c:5600:5: error: stack frame size of 1084 bytes in function 'atomisp_set_fmt' [-Werror,-Wframe-larger-than=]
>
> Of this structure, only three members in the 'fmt.pix' member are
> used, so simplify it by using the smaller v4l2_pix_format structure
> directly. This reduces the stack usage to 612 bytes, and it could
> be reduced further by only storing the three members that are used.
Good to me!
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> .../staging/media/atomisp/pci/atomisp_cmd.c | 65 +++++++++----------
> .../staging/media/atomisp/pci/atomisp_cmd.h | 2 +-
> .../staging/media/atomisp/pci/atomisp_ioctl.c | 2 +-
> 3 files changed, 33 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/staging/media/atomisp/pci/atomisp_cmd.c b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
> index 592ea990d4ca..3192c0716eb9 100644
> --- a/drivers/staging/media/atomisp/pci/atomisp_cmd.c
> +++ b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
> @@ -4837,7 +4837,7 @@ static void __atomisp_init_stream_info(u16 stream_index,
> }
>
> /* This function looks up the closest available resolution. */
> -int atomisp_try_fmt(struct video_device *vdev, struct v4l2_format *f,
> +int atomisp_try_fmt(struct video_device *vdev, struct v4l2_pix_format *f,
> bool *res_overflow)
> {
> struct atomisp_device *isp = video_get_drvdata(vdev);
> @@ -4859,18 +4859,18 @@ int atomisp_try_fmt(struct video_device *vdev, struct v4l2_format *f,
> return -EINVAL;
>
> stream_index = atomisp_source_pad_to_stream_id(asd, source_pad);
> - fmt = atomisp_get_format_bridge(f->fmt.pix.pixelformat);
> + fmt = atomisp_get_format_bridge(f->pixelformat);
> if (!fmt) {
> dev_err(isp->dev, "unsupported pixelformat!\n");
> fmt = atomisp_output_fmts;
> }
>
> - if (f->fmt.pix.width <= 0 || f->fmt.pix.height <= 0)
> + if (f->width <= 0 || f->height <= 0)
> return -EINVAL;
>
> snr_mbus_fmt->code = fmt->mbus_code;
> - snr_mbus_fmt->width = f->fmt.pix.width;
> - snr_mbus_fmt->height = f->fmt.pix.height;
> + snr_mbus_fmt->width = f->width;
> + snr_mbus_fmt->height = f->height;
>
> __atomisp_init_stream_info(stream_index, stream_info);
>
> @@ -4892,7 +4892,7 @@ int atomisp_try_fmt(struct video_device *vdev, struct v4l2_format *f,
> return -EINVAL;
> }
>
> - f->fmt.pix.pixelformat = fmt->pixelformat;
> + f->pixelformat = fmt->pixelformat;
>
> /*
> * If the format is jpeg or custom RAW, then the width and height will
> @@ -4900,17 +4900,17 @@ int atomisp_try_fmt(struct video_device *vdev, struct v4l2_format *f,
> * the below conditions. So just assign to what is being returned from
> * the sensor driver.
> */
> - if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_JPEG ||
> - f->fmt.pix.pixelformat == V4L2_PIX_FMT_CUSTOM_M10MO_RAW) {
> - f->fmt.pix.width = snr_mbus_fmt->width;
> - f->fmt.pix.height = snr_mbus_fmt->height;
> + if (f->pixelformat == V4L2_PIX_FMT_JPEG ||
> + f->pixelformat == V4L2_PIX_FMT_CUSTOM_M10MO_RAW) {
> + f->width = snr_mbus_fmt->width;
> + f->height = snr_mbus_fmt->height;
> return 0;
> }
>
> - if (snr_mbus_fmt->width < f->fmt.pix.width
> - && snr_mbus_fmt->height < f->fmt.pix.height) {
> - f->fmt.pix.width = snr_mbus_fmt->width;
> - f->fmt.pix.height = snr_mbus_fmt->height;
> + if (snr_mbus_fmt->width < f->width
> + && snr_mbus_fmt->height < f->height) {
> + f->width = snr_mbus_fmt->width;
> + f->height = snr_mbus_fmt->height;
> /* Set the flag when resolution requested is
> * beyond the max value supported by sensor
> */
> @@ -4919,12 +4919,10 @@ int atomisp_try_fmt(struct video_device *vdev, struct v4l2_format *f,
> }
>
> /* app vs isp */
> - f->fmt.pix.width = rounddown(
> - clamp_t(u32, f->fmt.pix.width, ATOM_ISP_MIN_WIDTH,
> - ATOM_ISP_MAX_WIDTH), ATOM_ISP_STEP_WIDTH);
> - f->fmt.pix.height = rounddown(
> - clamp_t(u32, f->fmt.pix.height, ATOM_ISP_MIN_HEIGHT,
> - ATOM_ISP_MAX_HEIGHT), ATOM_ISP_STEP_HEIGHT);
> + f->width = rounddown(clamp_t(u32, f->width, ATOM_ISP_MIN_WIDTH,
> + ATOM_ISP_MAX_WIDTH), ATOM_ISP_STEP_WIDTH);
> + f->height = rounddown(clamp_t(u32, f->height, ATOM_ISP_MIN_HEIGHT,
> + ATOM_ISP_MAX_HEIGHT), ATOM_ISP_STEP_HEIGHT);
>
> return 0;
> }
> @@ -5481,7 +5479,7 @@ static void atomisp_get_dis_envelop(struct atomisp_sub_device *asd,
> }
>
> static void atomisp_check_copy_mode(struct atomisp_sub_device *asd,
> - int source_pad, struct v4l2_format *f)
> + int source_pad, struct v4l2_pix_format *f)
> {
> #if defined(ISP2401_NEW_INPUT_SYSTEM)
> struct v4l2_mbus_framefmt *sink, *src;
> @@ -5492,8 +5490,8 @@ static void atomisp_check_copy_mode(struct atomisp_sub_device *asd,
> V4L2_SUBDEV_FORMAT_ACTIVE, source_pad);
>
> if ((sink->code == src->code &&
> - sink->width == f->fmt.pix.width &&
> - sink->height == f->fmt.pix.height) ||
> + sink->width == f->width &&
> + sink->height == f->height) ||
> ((asd->isp->inputs[asd->input_curr].type == SOC_CAMERA) &&
> (asd->isp->inputs[asd->input_curr].camera_caps->
> sensor[asd->sensor_curr].stream_num > 1)))
> @@ -5507,7 +5505,7 @@ static void atomisp_check_copy_mode(struct atomisp_sub_device *asd,
> }
>
> static int atomisp_set_fmt_to_snr(struct video_device *vdev,
> - struct v4l2_format *f, unsigned int pixelformat,
> + struct v4l2_pix_format *f, unsigned int pixelformat,
> unsigned int padding_w, unsigned int padding_h,
> unsigned int dvs_env_w, unsigned int dvs_env_h)
> {
> @@ -5535,7 +5533,7 @@ static int atomisp_set_fmt_to_snr(struct video_device *vdev,
> if (!format)
> return -EINVAL;
>
> - v4l2_fill_mbus_format(ffmt, &f->fmt.pix, format->mbus_code);
> + v4l2_fill_mbus_format(ffmt, f, format->mbus_code);
> ffmt->height += padding_h + dvs_env_h;
> ffmt->width += padding_w + dvs_env_w;
>
> @@ -5605,8 +5603,8 @@ int atomisp_set_fmt(struct video_device *vdev, struct v4l2_format *f)
> const struct atomisp_format_bridge *format_bridge;
> const struct atomisp_format_bridge *snr_format_bridge;
> struct ia_css_frame_info output_info, raw_output_info;
> - struct v4l2_format snr_fmt = *f;
> - struct v4l2_format backup_fmt = *f, s_fmt = *f;
> + struct v4l2_pix_format snr_fmt = f->fmt.pix;
> + struct v4l2_pix_format backup_fmt = snr_fmt, s_fmt;
> unsigned int dvs_env_w = 0, dvs_env_h = 0;
> unsigned int padding_w = pad_w, padding_h = pad_h;
> bool res_overflow = false, crop_needs_override = false;
> @@ -5780,11 +5778,10 @@ int atomisp_set_fmt(struct video_device *vdev, struct v4l2_format *f)
> dev_warn(isp->dev, "Try format failed with error %d\n", ret);
> return ret;
> }
> - f->fmt.pix.width = snr_fmt.fmt.pix.width;
> - f->fmt.pix.height = snr_fmt.fmt.pix.height;
> + f->fmt.pix.width = snr_fmt.width;
> + f->fmt.pix.height = snr_fmt.height;
>
> - snr_format_bridge =
> - atomisp_get_format_bridge(snr_fmt.fmt.pix.pixelformat);
> + snr_format_bridge = atomisp_get_format_bridge(snr_fmt.pixelformat);
> if (!snr_format_bridge) {
> dev_warn(isp->dev, "Can't find bridge format\n");
> return -EINVAL;
> @@ -5865,11 +5862,11 @@ int atomisp_set_fmt(struct video_device *vdev, struct v4l2_format *f)
> * and height while set_mbus_fmt() so actual resolutions are
> * being used in while set media bus format.
> */
> - s_fmt = *f;
> + s_fmt = f->fmt.pix;
> if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_JPEG ||
> f->fmt.pix.pixelformat == V4L2_PIX_FMT_CUSTOM_M10MO_RAW) {
> - s_fmt.fmt.pix.width = backup_fmt.fmt.pix.width;
> - s_fmt.fmt.pix.height = backup_fmt.fmt.pix.height;
> + s_fmt.width = backup_fmt.width;
> + s_fmt.height = backup_fmt.height;
> }
> ret = atomisp_set_fmt_to_snr(vdev, &s_fmt,
> f->fmt.pix.pixelformat, padding_w,
> diff --git a/drivers/staging/media/atomisp/pci/atomisp_cmd.h b/drivers/staging/media/atomisp/pci/atomisp_cmd.h
> index 1c0d464c2ac1..412baeb91944 100644
> --- a/drivers/staging/media/atomisp/pci/atomisp_cmd.h
> +++ b/drivers/staging/media/atomisp/pci/atomisp_cmd.h
> @@ -333,7 +333,7 @@ int atomisp_get_sensor_mode_data(struct atomisp_sub_device *asd,
> int atomisp_get_fmt(struct video_device *vdev, struct v4l2_format *f);
>
> /* This function looks up the closest available resolution. */
> -int atomisp_try_fmt(struct video_device *vdev, struct v4l2_format *f,
> +int atomisp_try_fmt(struct video_device *vdev, struct v4l2_pix_format *f,
> bool *res_overflow);
>
> int atomisp_set_fmt(struct video_device *vdev, struct v4l2_format *f);
> diff --git a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
> index 2ae50decfc8b..c6adffebe24a 100644
> --- a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
> +++ b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
> @@ -843,7 +843,7 @@ static int atomisp_try_fmt_cap(struct file *file, void *fh,
> int ret;
>
> rt_mutex_lock(&isp->mutex);
> - ret = atomisp_try_fmt(vdev, f, NULL);
> + ret = atomisp_try_fmt(vdev, &f->fmt.pix, NULL);
> rt_mutex_unlock(&isp->mutex);
> return ret;
> }
> --
> 2.29.2
>
--
With Best Regards,
Andy Shevchenko
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