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Date: Tue, 15 Sep 2015 17:49:07 +0200
From: Arnd Bergmann <arnd@...db.de>
To: linux-media@...r.kernel.org
Cc: 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,
Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 6/7] [RFC] [media]: v4l2: introduce v4l2_timeval
The v4l2 API uses a 'struct timeval' to communicate time stamps to user
space. This is broken on 32-bit architectures as soon as we have a C library
that defines time_t as 64 bit, which then changes the structure layout of
struct v4l2_buffer.
Fortunately, almost all v4l2 drivers use monotonic timestamps and call
v4l2_get_timestamp(), which means they don't also have a y2038 problem.
This means we can keep using the existing binary layout of the structure
and do not need to worry about defining a new kernel interface for
userland with 64-bit time_t.
A possible downside of this approach is that it breaks any user space
that tries to assign the timeval structure returned from the kernel
to another timeval, or to pass a pointer to it into a function that
expects a timeval. Those will cause a build-time warning or error
that can be fixed up in a backwards compatible way.
The alternative to this patch is to leave the structure using
'struct timeval', but then we have to rework the kernel to let
it handle both 32-bit and 64-bit time_t for 32-bit user space
processes.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
drivers/media/pci/bt8xx/bttv-driver.c | 2 +-
drivers/media/pci/meye/meye.h | 2 +-
drivers/media/pci/zoran/zoran.h | 2 +-
drivers/media/platform/coda/coda.h | 2 +-
drivers/media/platform/omap/omap_vout.c | 4 ++--
drivers/media/platform/omap3isp/ispstat.h | 2 +-
drivers/media/platform/vim2m.c | 2 +-
drivers/media/platform/vivid/vivid-ctrls.c | 2 +-
drivers/media/usb/cpia2/cpia2.h | 2 +-
drivers/media/usb/cpia2/cpia2_v4l.c | 2 +-
drivers/media/usb/gspca/gspca.c | 2 +-
drivers/media/usb/usbvision/usbvision.h | 2 +-
drivers/media/v4l2-core/v4l2-common.c | 6 +++---
include/media/v4l2-common.h | 2 +-
include/media/videobuf-core.h | 2 +-
include/trace/events/v4l2.h | 12 ++++++++++--
include/uapi/linux/omap3isp.h | 2 +-
include/uapi/linux/videodev2.h | 8 +++++++-
18 files changed, 36 insertions(+), 22 deletions(-)
diff --git a/drivers/media/pci/bt8xx/bttv-driver.c b/drivers/media/pci/bt8xx/bttv-driver.c
index 15a4ebc2844d..b0ed8d799c14 100644
--- a/drivers/media/pci/bt8xx/bttv-driver.c
+++ b/drivers/media/pci/bt8xx/bttv-driver.c
@@ -3585,7 +3585,7 @@ static void
bttv_irq_wakeup_video(struct bttv *btv, struct bttv_buffer_set *wakeup,
struct bttv_buffer_set *curr, unsigned int state)
{
- struct timeval ts;
+ struct v4l2_timeval ts;
v4l2_get_timestamp(&ts);
diff --git a/drivers/media/pci/meye/meye.h b/drivers/media/pci/meye/meye.h
index 751be5e533c7..a06aa5ba9abc 100644
--- a/drivers/media/pci/meye/meye.h
+++ b/drivers/media/pci/meye/meye.h
@@ -281,7 +281,7 @@
struct meye_grab_buffer {
int state; /* state of buffer */
unsigned long size; /* size of jpg frame */
- struct timeval timestamp; /* timestamp */
+ struct v4l2_timeval timestamp; /* timestamp */
unsigned long sequence; /* sequence number */
};
diff --git a/drivers/media/pci/zoran/zoran.h b/drivers/media/pci/zoran/zoran.h
index 4e7db8939c2b..9a9f782cede9 100644
--- a/drivers/media/pci/zoran/zoran.h
+++ b/drivers/media/pci/zoran/zoran.h
@@ -39,7 +39,7 @@ struct zoran_sync {
unsigned long frame; /* number of buffer that has been free'd */
unsigned long length; /* number of code bytes in buffer (capture only) */
unsigned long seq; /* frame sequence number */
- struct timeval timestamp; /* timestamp */
+ struct v4l2_timeval timestamp; /* timestamp */
};
diff --git a/drivers/media/platform/coda/coda.h b/drivers/media/platform/coda/coda.h
index 59b2af9c7749..fa1e15a757cd 100644
--- a/drivers/media/platform/coda/coda.h
+++ b/drivers/media/platform/coda/coda.h
@@ -138,7 +138,7 @@ struct coda_buffer_meta {
struct list_head list;
u32 sequence;
struct v4l2_timecode timecode;
- struct timeval timestamp;
+ struct v4l2_timeval timestamp;
u32 start;
u32 end;
};
diff --git a/drivers/media/platform/omap/omap_vout.c b/drivers/media/platform/omap/omap_vout.c
index 70c28d19ea04..974a238a86fe 100644
--- a/drivers/media/platform/omap/omap_vout.c
+++ b/drivers/media/platform/omap/omap_vout.c
@@ -513,7 +513,7 @@ static int omapvid_apply_changes(struct omap_vout_device *vout)
}
static int omapvid_handle_interlace_display(struct omap_vout_device *vout,
- unsigned int irqstatus, struct timeval timevalue)
+ unsigned int irqstatus, struct v4l2_timeval timevalue)
{
u32 fid;
@@ -557,7 +557,7 @@ static void omap_vout_isr(void *arg, unsigned int irqstatus)
int ret, fid, mgr_id;
u32 addr, irq;
struct omap_overlay *ovl;
- struct timeval timevalue;
+ struct v4l2_timeval timevalue;
struct omapvideo_info *ovid;
struct omap_dss_device *cur_display;
struct omap_vout_device *vout = (struct omap_vout_device *)arg;
diff --git a/drivers/media/platform/omap3isp/ispstat.h b/drivers/media/platform/omap3isp/ispstat.h
index 6d9b0244f320..7b4f136567a3 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 v4l2_timeval ts;
u32 buf_size;
u32 frame_number;
u16 config_counter;
diff --git a/drivers/media/platform/vim2m.c b/drivers/media/platform/vim2m.c
index 295fde5fdb75..df5daac6d099 100644
--- a/drivers/media/platform/vim2m.c
+++ b/drivers/media/platform/vim2m.c
@@ -235,7 +235,7 @@ static int device_process(struct vim2m_ctx *ctx,
in_vb->v4l2_buf.sequence = q_data->sequence++;
memcpy(&out_vb->v4l2_buf.timestamp,
&in_vb->v4l2_buf.timestamp,
- sizeof(struct timeval));
+ sizeof(struct v4l2_timeval));
if (in_vb->v4l2_buf.flags & V4L2_BUF_FLAG_TIMECODE)
memcpy(&out_vb->v4l2_buf.timecode, &in_vb->v4l2_buf.timecode,
sizeof(struct v4l2_timecode));
diff --git a/drivers/media/platform/vivid/vivid-ctrls.c b/drivers/media/platform/vivid/vivid-ctrls.c
index 339c8b7e53c8..065f3d6c2409 100644
--- a/drivers/media/platform/vivid/vivid-ctrls.c
+++ b/drivers/media/platform/vivid/vivid-ctrls.c
@@ -935,7 +935,7 @@ static const struct v4l2_ctrl_config vivid_ctrl_has_scaler_out = {
static int vivid_streaming_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct vivid_dev *dev = container_of(ctrl->handler, struct vivid_dev, ctrl_hdl_streaming);
- struct timeval tv;
+ struct v4l2_timeval tv;
switch (ctrl->id) {
case VIVID_CID_DQBUF_ERROR:
diff --git a/drivers/media/usb/cpia2/cpia2.h b/drivers/media/usb/cpia2/cpia2.h
index cdef677d57ec..3e7c523784e7 100644
--- a/drivers/media/usb/cpia2/cpia2.h
+++ b/drivers/media/usb/cpia2/cpia2.h
@@ -354,7 +354,7 @@ struct cpia2_sbuf {
};
struct framebuf {
- struct timeval timestamp;
+ struct v4l2_timeval timestamp;
unsigned long seq;
int num;
int length;
diff --git a/drivers/media/usb/cpia2/cpia2_v4l.c b/drivers/media/usb/cpia2/cpia2_v4l.c
index 9caea8344547..ce50d7ef4da7 100644
--- a/drivers/media/usb/cpia2/cpia2_v4l.c
+++ b/drivers/media/usb/cpia2/cpia2_v4l.c
@@ -892,7 +892,7 @@ static int find_earliest_filled_buffer(struct camera_data *cam)
found = i;
} else {
/* find which buffer is earlier */
- struct timeval *tv1, *tv2;
+ struct v4l2_timeval *tv1, *tv2;
tv1 = &cam->buffers[i].timestamp;
tv2 = &cam->buffers[found].timestamp;
if(tv1->tv_sec < tv2->tv_sec ||
diff --git a/drivers/media/usb/gspca/gspca.c b/drivers/media/usb/gspca/gspca.c
index af5cd8213e8b..c977937da9c4 100644
--- a/drivers/media/usb/gspca/gspca.c
+++ b/drivers/media/usb/gspca/gspca.c
@@ -1898,7 +1898,7 @@ static ssize_t dev_read(struct file *file, char __user *data,
struct gspca_dev *gspca_dev = video_drvdata(file);
struct gspca_frame *frame;
struct v4l2_buffer v4l2_buf;
- struct timeval timestamp;
+ struct v4l2_timeval timestamp;
int n, ret, ret2;
PDEBUG(D_FRAM, "read (%zd)", count);
diff --git a/drivers/media/usb/usbvision/usbvision.h b/drivers/media/usb/usbvision/usbvision.h
index 4f2e4fde38f2..512de31613df 100644
--- a/drivers/media/usb/usbvision/usbvision.h
+++ b/drivers/media/usb/usbvision/usbvision.h
@@ -320,7 +320,7 @@ struct usbvision_frame {
long bytes_read; /* amount of scanlength that has been read from data */
struct usbvision_v4l2_format_st v4l2_format; /* format the user needs*/
int v4l2_linesize; /* bytes for one videoline*/
- struct timeval timestamp;
+ struct v4l2_timeval timestamp;
int sequence; /* How many video frames we send to user */
};
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index 5b808500e7e7..589fab615f21 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -396,11 +396,11 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
}
EXPORT_SYMBOL_GPL(v4l2_find_nearest_format);
-void v4l2_get_timestamp(struct timeval *tv)
+void v4l2_get_timestamp(struct v4l2_timeval *tv)
{
- struct timespec ts;
+ struct timespec64 ts;
- ktime_get_ts(&ts);
+ ktime_get_ts64(&ts);
tv->tv_sec = ts.tv_sec;
tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
}
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 1cc0c5ba16b3..6e77d889c3f8 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -187,6 +187,6 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
const struct v4l2_discrete_probe *probe,
s32 width, s32 height);
-void v4l2_get_timestamp(struct timeval *tv);
+void v4l2_get_timestamp(struct v4l2_timeval *tv);
#endif /* V4L2_COMMON_H_ */
diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
index d760aa73ebbb..6381338a9588 100644
--- a/include/media/videobuf-core.h
+++ b/include/media/videobuf-core.h
@@ -80,7 +80,7 @@ struct videobuf_buffer {
struct list_head queue;
wait_queue_head_t done;
unsigned int field_count;
- struct timeval ts;
+ struct v4l2_timeval ts;
/* Memory type */
enum v4l2_memory memory;
diff --git a/include/trace/events/v4l2.h b/include/trace/events/v4l2.h
index dbf017bfddd9..a88be48dc473 100644
--- a/include/trace/events/v4l2.h
+++ b/include/trace/events/v4l2.h
@@ -6,6 +6,14 @@
#include <linux/tracepoint.h>
+#ifndef v4l2_timeval_to_ns
+#define v4l2_timeval_to_ns v4l2_timeval_to_ns
+static inline u64 v4l2_timeval_to_ns(struct v4l2_timeval *tv)
+{
+ return (u64)tv->tv_sec * NSEC_PER_SEC + tv->tv_usec * NSEC_PER_USEC;
+}
+#endif
+
/* Enums require being exported to userspace, for user tool parsing */
#undef EM
#undef EMe
@@ -126,7 +134,7 @@ DECLARE_EVENT_CLASS(v4l2_event_class,
__entry->bytesused = buf->bytesused;
__entry->flags = buf->flags;
__entry->field = buf->field;
- __entry->timestamp = timeval_to_ns(&buf->timestamp);
+ __entry->timestamp = v4l2_timeval_to_ns(&buf->timestamp);
__entry->timecode_type = buf->timecode.type;
__entry->timecode_flags = buf->timecode.flags;
__entry->timecode_frames = buf->timecode.frames;
@@ -211,7 +219,7 @@ DECLARE_EVENT_CLASS(vb2_event_class,
__entry->bytesused = vb->v4l2_planes[0].bytesused;
__entry->flags = vb->v4l2_buf.flags;
__entry->field = vb->v4l2_buf.field;
- __entry->timestamp = timeval_to_ns(&vb->v4l2_buf.timestamp);
+ __entry->timestamp = v4l2_timeval_to_ns(&vb->v4l2_buf.timestamp);
__entry->timecode_type = vb->v4l2_buf.timecode.type;
__entry->timecode_flags = vb->v4l2_buf.timecode.flags;
__entry->timecode_frames = vb->v4l2_buf.timecode.frames;
diff --git a/include/uapi/linux/omap3isp.h b/include/uapi/linux/omap3isp.h
index c090cf9249bb..2d1a085d9c9b 100644
--- a/include/uapi/linux/omap3isp.h
+++ b/include/uapi/linux/omap3isp.h
@@ -164,7 +164,7 @@ struct omap3isp_h3a_aewb_config {
* @config_counter: Number of the configuration associated with the data.
*/
struct omap3isp_stat_data {
- struct timeval ts;
+ struct v4l2_timeval ts;
void __user *buf;
__u32 buf_size;
__u16 frame_number;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 3228fbebcd63..b02cf054fbb8 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -803,6 +803,12 @@ struct v4l2_plane {
__u32 reserved[11];
};
+/* used for monotonic times, therefore y2038 safe */
+struct v4l2_timeval {
+ long tv_sec;
+ long tv_usec;
+};
+
/**
* struct v4l2_buffer - video buffer info
* @index: id number of the buffer
@@ -839,7 +845,7 @@ struct v4l2_buffer {
__u32 bytesused;
__u32 flags;
__u32 field;
- struct timeval timestamp;
+ struct v4l2_timeval timestamp;
struct v4l2_timecode timecode;
__u32 sequence;
--
2.1.0.rc2
--
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