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Date: Mon, 7 May 2018 16:19:06 +0300
From: Sakari Ailus <sakari.ailus@....fi>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Arnd Bergmann <arnd@...db.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RESEND] [media] omap3isp: support 64-bit version of
omap3isp_stat_data
On Mon, May 07, 2018 at 04:17:32PM +0300, Laurent Pinchart wrote:
> Hi Arnd,
>
> Thank you for the patch.
>
> On Thursday, 26 April 2018 00:30:10 EEST 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.
> >
> > Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Cc: Sakari Ailus <sakari.ailus@....fi>
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> > I submitted this one in November and asked again in January,
> > still waiting for a review so it can be applied.
> > ---
> > 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>
>
> Could you please keep the headers alphabetically sorted ?
>
> >
> > #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;
>
> We could return immediately after omap3isp_stat_request_statistics() if the
> function fails, but that's no big deal, the error path is clearly a cold path.
>
> > +}
> > +
> > /*
> > * 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;
>
> I share Sakari's comment about this method implying a little-endian system,
> but as the SoCs that integrate this device are all little-endian, that's not a
> problem in practice.
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> If you agree with the small comment about header ordering, let's get this
> patch finally merged.
I can make the change locally in my tree, no need to resend.
Thanks.
--
Sakari Ailus
e-mail: sakari.ailus@....fi
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