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Date: Mon, 09 Nov 2015 22:09:26 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
y2038@...ts.linaro.org,
Mauro Carvalho Chehab <mchehab@....samsung.com>,
linux-api@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH v2 9/9] [media] omap3isp: support 64-bit version of omap3isp_stat_data
Hi Arnd,
Thank you for the patch.
On Thursday 17 September 2015 23:19:40 Arnd Bergmann wrote:
> C libraries with 64-bit time_t use an incompatible format for
> struct omap3isp_stat_data. This changes the kernel code to
> support either version, by moving over the normal handling
> to the 64-bit variant, and adding compatiblity code to handle
> the old binary format with the existing ioctl command code.
>
> Fortunately, the command code includes the size of the structure,
> so the difference gets handled automatically.
We plan to design a new interface to handle statistics in V4L2. That API
should support proper 64-bit timestamps out of the box, and will be
implemented by the OMAP3 ISP driver. Userspace should then move to it. I
wonder if it's worth it to fix the existing VIDIOC_OMAP3ISP_STAT_REQ ioctl
given that I expect it to have a handful of users at most.
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> drivers/media/platform/omap3isp/isph3a_aewb.c | 2 ++
> drivers/media/platform/omap3isp/isph3a_af.c | 2 ++
> drivers/media/platform/omap3isp/isphist.c | 2 ++
> drivers/media/platform/omap3isp/ispstat.c | 18 ++++++++++++++++--
> drivers/media/platform/omap3isp/ispstat.h | 2 ++
> include/uapi/linux/omap3isp.h | 19 +++++++++++++++++++
> 6 files changed, 43 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/omap3isp/isph3a_aewb.c
> b/drivers/media/platform/omap3isp/isph3a_aewb.c index
> ccaf92f39236..2d567725608f 100644
> --- a/drivers/media/platform/omap3isp/isph3a_aewb.c
> +++ b/drivers/media/platform/omap3isp/isph3a_aewb.c
> @@ -250,6 +250,8 @@ static long h3a_aewb_ioctl(struct v4l2_subdev *sd,
> unsigned int cmd, void *arg) return omap3isp_stat_config(stat, arg);
> case VIDIOC_OMAP3ISP_STAT_REQ:
> return omap3isp_stat_request_statistics(stat, arg);
> + case VIDIOC_OMAP3ISP_STAT_REQ_TIME32:
> + return omap3isp_stat_request_statistics_time32(stat, arg);
> case VIDIOC_OMAP3ISP_STAT_EN: {
> unsigned long *en = arg;
> return omap3isp_stat_enable(stat, !!*en);
> diff --git a/drivers/media/platform/omap3isp/isph3a_af.c
> b/drivers/media/platform/omap3isp/isph3a_af.c index
> 92937f7eecef..2ac02371318b 100644
> --- a/drivers/media/platform/omap3isp/isph3a_af.c
> +++ b/drivers/media/platform/omap3isp/isph3a_af.c
> @@ -314,6 +314,8 @@ static long h3a_af_ioctl(struct v4l2_subdev *sd,
> unsigned int cmd, void *arg) return omap3isp_stat_config(stat, arg);
> case VIDIOC_OMAP3ISP_STAT_REQ:
> return omap3isp_stat_request_statistics(stat, arg);
> + case VIDIOC_OMAP3ISP_STAT_REQ_TIME32:
> + return omap3isp_stat_request_statistics_time32(stat, arg);
> case VIDIOC_OMAP3ISP_STAT_EN: {
> int *en = arg;
> return omap3isp_stat_enable(stat, !!*en);
> diff --git a/drivers/media/platform/omap3isp/isphist.c
> b/drivers/media/platform/omap3isp/isphist.c index
> 7138b043a4aa..669b97b079ee 100644
> --- a/drivers/media/platform/omap3isp/isphist.c
> +++ b/drivers/media/platform/omap3isp/isphist.c
> @@ -436,6 +436,8 @@ static long hist_ioctl(struct v4l2_subdev *sd, unsigned
> int cmd, void *arg) return omap3isp_stat_config(stat, arg);
> case VIDIOC_OMAP3ISP_STAT_REQ:
> return omap3isp_stat_request_statistics(stat, arg);
> + case VIDIOC_OMAP3ISP_STAT_REQ_TIME32:
> + return omap3isp_stat_request_statistics_time32(stat, arg);
> case VIDIOC_OMAP3ISP_STAT_EN: {
> int *en = arg;
> return omap3isp_stat_enable(stat, !!*en);
> diff --git a/drivers/media/platform/omap3isp/ispstat.c
> b/drivers/media/platform/omap3isp/ispstat.c index
> fa96e330c563..3d70332422b5 100644
> --- a/drivers/media/platform/omap3isp/ispstat.c
> +++ b/drivers/media/platform/omap3isp/ispstat.c
> @@ -496,8 +496,7 @@ int omap3isp_stat_request_statistics(struct ispstat
> *stat, return PTR_ERR(buf);
> }
>
> - data->ts.tv_sec = buf->ts.tv_sec;
> - data->ts.tv_usec = buf->ts.tv_usec;
> + data->ts = buf->ts;
> data->config_counter = buf->config_counter;
> data->frame_number = buf->frame_number;
> data->buf_size = buf->buf_size;
> @@ -509,6 +508,21 @@ int omap3isp_stat_request_statistics(struct ispstat
> *stat, return 0;
> }
>
> +int omap3isp_stat_request_statistics_time32(struct ispstat *stat,
> + struct omap3isp_stat_data_time32 *data)
> +{
> + struct omap3isp_stat_data data64;
> + int ret;
> +
> + ret = omap3isp_stat_request_statistics(stat, &data64);
> +
> + data->ts.tv_sec = data64.ts.tv_sec;
> + data->ts.tv_usec = data64.ts.tv_usec;
> + memcpy(&data->buf, &data64.buf, sizeof(*data) - sizeof(data->ts));
> +
> + return ret;
> +}
> +
> /*
> * omap3isp_stat_config - Receives new statistic engine configuration.
> * @new_conf: Pointer to config structure.
> diff --git a/drivers/media/platform/omap3isp/ispstat.h
> b/drivers/media/platform/omap3isp/ispstat.h index
> 7b4f136567a3..b19ea6c8f733 100644
> --- a/drivers/media/platform/omap3isp/ispstat.h
> +++ b/drivers/media/platform/omap3isp/ispstat.h
> @@ -130,6 +130,8 @@ struct ispstat_generic_config {
> int omap3isp_stat_config(struct ispstat *stat, void *new_conf);
> int omap3isp_stat_request_statistics(struct ispstat *stat,
> struct omap3isp_stat_data *data);
> +int omap3isp_stat_request_statistics_time32(struct ispstat *stat,
> + struct omap3isp_stat_data_time32 *data);
> int omap3isp_stat_init(struct ispstat *stat, const char *name,
> const struct v4l2_subdev_ops *sd_ops);
> void omap3isp_stat_cleanup(struct ispstat *stat);
> diff --git a/include/uapi/linux/omap3isp.h b/include/uapi/linux/omap3isp.h
> index c090cf9249bb..4bff66aefca5 100644
> --- a/include/uapi/linux/omap3isp.h
> +++ b/include/uapi/linux/omap3isp.h
> @@ -54,6 +54,8 @@
> _IOWR('V', BASE_VIDIOC_PRIVATE + 5, struct omap3isp_h3a_af_config)
> #define VIDIOC_OMAP3ISP_STAT_REQ \
> _IOWR('V', BASE_VIDIOC_PRIVATE + 6, struct omap3isp_stat_data)
> +#define VIDIOC_OMAP3ISP_STAT_REQ_TIME32 \
> + _IOWR('V', BASE_VIDIOC_PRIVATE + 6, struct omap3isp_stat_data_time32)
> #define VIDIOC_OMAP3ISP_STAT_EN \
> _IOWR('V', BASE_VIDIOC_PRIVATE + 7, unsigned long)
>
> @@ -164,7 +166,11 @@ struct omap3isp_h3a_aewb_config {
> * @config_counter: Number of the configuration associated with the data.
> */
> struct omap3isp_stat_data {
> +#ifdef __KERNEL__
> + struct v4l2_timeval ts;
> +#else
> struct timeval ts;
> +#endif
> void __user *buf;
> __u32 buf_size;
> __u16 frame_number;
> @@ -172,6 +178,19 @@ struct omap3isp_stat_data {
> __u16 config_counter;
> };
>
> +#ifdef __KERNEL__
> +struct omap3isp_stat_data_time32 {
> + struct {
> + __s32 tv_sec;
> + __s32 tv_usec;
> + } ts;
> + __u32 buf;
> + __u32 buf_size;
> + __u16 frame_number;
> + __u16 cur_frame;
> + __u16 config_counter;
> +};
> +#endif
>
> /* Histogram related structs */
--
Regards,
Laurent Pinchart
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