Re: [Y2038] [PATCH 5/8] [media] omap3isp: support 64-bit version of omap3isp_stat_data

Hi Arnd,

Thank you for the patch.

I'll try to review this without too much delay. In the meantime, I'm CC'ing Sakari Ailus who might be faster than me :-)

On Monday, 27 November 2017 15:19:57 EET 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. In the process of eliminating the references to 'struct timeval' from the kernel, I also change the way the timestamp is generated internally, basically by open-coding the v4l2_get_timestamp() call.

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 | 21 +++++++++++++++++++-- drivers/media/platform/omap3isp/ispstat.h | 4 +++- include/uapi/linux/omap3isp.h | 22 ++++++++++++++++++++++ 6 files changed, 50 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/omap3isp/isph3a_aewb.c b/drivers/media/platform/omap3isp/isph3a_aewb.c index d44626f20ac6..3c82dea4d375 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 99bd6cc21d86..4da25c84f0c6 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 a4ed5d140d48..d4be3d0e06f9 100644 --- a/drivers/media/platform/omap3isp/isphist.c +++ b/drivers/media/platform/omap3isp/isphist.c @@ -435,6 +435,8 @@ 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 47cbc7e3d825..5967dfd0a9f7 100644 --- a/drivers/media/platform/omap3isp/ispstat.c +++ b/drivers/media/platform/omap3isp/ispstat.c @@ -18,6 +18,7 @@ #include <linux/dma-mapping.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <linux/timekeeping.h>

#include "isp.h"

@@ -237,7 +238,7 @@ static int isp_stat_buf_queue(struct ispstat *stat) if (!stat->active_buf) return STAT_NO_BUF;

• v4l2_get_timestamp(&stat->active_buf->ts);

• ktime_get_ts64(&stat->active_buf->ts);

  stat->active_buf->buf_size = stat->buf_size; if (isp_stat_buf_check_magic(stat, stat->active_buf)) {

@@ -500,7 +501,8 @@ int omap3isp_stat_request_statistics(struct ispstat *stat, return PTR_ERR(buf); }

• data->ts = buf->ts;

• data->ts.tv_sec = buf->ts.tv_sec;
• data->ts.tv_usec = buf->ts.tv_nsec / NSEC_PER_USEC; data->config_counter = buf->config_counter; data->frame_number = buf->frame_number; data->buf_size = buf->buf_size;

@@ -512,6 +514,21 @@ 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 6d9b0244f320..923b38cfc682 100644 --- a/drivers/media/platform/omap3isp/ispstat.h +++ b/drivers/media/platform/omap3isp/ispstat.h @@ -39,7 +39,7 @@ struct ispstat_buffer { struct sg_table sgt; void *virt_addr; dma_addr_t dma_addr;

• struct timeval ts;

• struct timespec64 ts; u32 buf_size; u32 frame_number; u16 config_counter;

@@ -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 1a920145db04..87b55755f4ff 100644 --- a/include/uapi/linux/omap3isp.h +++ b/include/uapi/linux/omap3isp.h @@ -55,6 +55,8 @@ _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)

@@ -165,7 +167,14 @@ struct omap3isp_h3a_aewb_config {

• @config_counter: Number of the configuration associated with the data.

*/ struct omap3isp_stat_data { +#ifdef __KERNEL__

• struct {

• __s64	tv_sec;
  

• __s64	tv_usec;
  

• } ts;

+#else struct timeval ts; +#endif void __user *buf; __u32 buf_size; __u16 frame_number; @@ -173,6 +182,19 @@ 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 */