Re: [Y2038] [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@arndb.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 */