media: v4l2: abstract timeval handling in v4l2_buffer

As a preparation for adding 64-bit time_t support in the uapi,
change the drivers to no longer care about the format of the
timestamp field in struct v4l2_buffer.

The v4l2_timeval_to_ns() function is no longer needed in the
kernel after this, but there is userspace code relying on
it to be part of the uapi header.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil-cisco@xs4all.nl: replace spaces by tabs]
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index e652f43..eb5d5db 100644 (file)
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -146,7 +146,7 @@ static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
                 * and the timecode field and flag if needed.
                 */
                if (q->copy_timestamp)
-                       vb->timestamp = v4l2_timeval_to_ns(&b->timestamp);
+                       vb->timestamp = v4l2_buffer_get_timestamp(b);
                vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
                if (b->flags & V4L2_BUF_FLAG_TIMECODE)
                        vbuf->timecode = b->timecode;
@@ -482,7 +482,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
 
        b->flags = vbuf->flags;
        b->field = vbuf->field;
-       b->timestamp = ns_to_timeval(vb->timestamp);
+       v4l2_buffer_set_timestamp(b, vb->timestamp);
        b->timecode = vbuf->timecode;
        b->sequence = vbuf->sequence;
        b->reserved2 = 0;

diff --git a/drivers/media/pci/meye/meye.c b/drivers/media/pci/meye/meye.c
index 0e61c81..3a4c29b 100644 (file)
--- a/drivers/media/pci/meye/meye.c
+++ b/drivers/media/pci/meye/meye.c
@@ -1266,7 +1266,7 @@ static int vidioc_querybuf(struct file *file, void *fh, struct v4l2_buffer *buf)
                buf->flags |= V4L2_BUF_FLAG_DONE;
 
        buf->field = V4L2_FIELD_NONE;
-       buf->timestamp = ns_to_timeval(meye.grab_buffer[index].ts);
+       v4l2_buffer_set_timestamp(buf, meye.grab_buffer[index].ts);
        buf->sequence = meye.grab_buffer[index].sequence;
        buf->memory = V4L2_MEMORY_MMAP;
        buf->m.offset = index * gbufsize;
@@ -1332,7 +1332,7 @@ static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
        buf->bytesused = meye.grab_buffer[reqnr].size;
        buf->flags = V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        buf->field = V4L2_FIELD_NONE;
-       buf->timestamp = ns_to_timeval(meye.grab_buffer[reqnr].ts);
+       v4l2_buffer_set_timestamp(buf, meye.grab_buffer[reqnr].ts);
        buf->sequence = meye.grab_buffer[reqnr].sequence;
        buf->memory = V4L2_MEMORY_MMAP;
        buf->m.offset = reqnr * gbufsize;

diff --git a/drivers/media/usb/cpia2/cpia2_v4l.c b/drivers/media/usb/cpia2/cpia2_v4l.c
index 626264a..9d3d051 100644 (file)
--- a/drivers/media/usb/cpia2/cpia2_v4l.c
+++ b/drivers/media/usb/cpia2/cpia2_v4l.c
@@ -800,7 +800,7 @@ static int cpia2_querybuf(struct file *file, void *fh, struct v4l2_buffer *buf)
                break;
        case FRAME_READY:
                buf->bytesused = cam->buffers[buf->index].length;
-               buf->timestamp = ns_to_timeval(cam->buffers[buf->index].ts);
+               v4l2_buffer_set_timestamp(buf, cam->buffers[buf->index].ts);
                buf->sequence = cam->buffers[buf->index].seq;
                buf->flags = V4L2_BUF_FLAG_DONE;
                break;
@@ -907,7 +907,7 @@ static int cpia2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
        buf->flags = V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_DONE
                | V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        buf->field = V4L2_FIELD_NONE;
-       buf->timestamp = ns_to_timeval(cam->buffers[buf->index].ts);
+       v4l2_buffer_set_timestamp(buf, cam->buffers[buf->index].ts);
        buf->sequence = cam->buffers[buf->index].seq;
        buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
        buf->length = cam->frame_size;

diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index 21f90a8..b22501f 100644 (file)
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -1125,7 +1125,7 @@ static int stk_vidioc_dqbuf(struct file *filp,
        sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
        sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
        sbuf->v4lbuf.sequence = ++dev->sequence;
-       sbuf->v4lbuf.timestamp = ns_to_timeval(ktime_get_ns());
+       v4l2_buffer_set_timestamp(&sbuf->v4lbuf, ktime_get_ns());
 
        *buf = sbuf->v4lbuf;
        return 0;

diff --git a/drivers/media/usb/usbvision/usbvision-video.c b/drivers/media/usb/usbvision/usbvision-video.c
index 93d36aa..5ca2c2f 100644 (file)
--- a/drivers/media/usb/usbvision/usbvision-video.c
+++ b/drivers/media/usb/usbvision/usbvision-video.c
@@ -696,7 +696,7 @@ static int vidioc_querybuf(struct file *file,
        vb->length = usbvision->curwidth *
                usbvision->curheight *
                usbvision->palette.bytes_per_pixel;
-       vb->timestamp = ns_to_timeval(usbvision->frame[vb->index].ts);
+       v4l2_buffer_set_timestamp(vb, usbvision->frame[vb->index].ts);
        vb->sequence = usbvision->frame[vb->index].sequence;
        return 0;
 }
@@ -765,7 +765,7 @@ static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *vb)
                V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        vb->index = f->index;
        vb->sequence = f->sequence;
-       vb->timestamp = ns_to_timeval(f->ts);
+       v4l2_buffer_set_timestamp(vb, f->ts);
        vb->field = V4L2_FIELD_NONE;
        vb->bytesused = f->scanlength;
 

diff --git a/drivers/media/v4l2-core/videobuf-core.c b/drivers/media/v4l2-core/videobuf-core.c
index 939fc11..2686f03 100644 (file)
--- a/drivers/media/v4l2-core/videobuf-core.c
+++ b/drivers/media/v4l2-core/videobuf-core.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 
 #include <media/videobuf-core.h>
+#include <media/v4l2-common.h>
 
 #define MAGIC_BUFFER 0x20070728
 #define MAGIC_CHECK(is, should)                                                \
@@ -364,7 +365,7 @@ static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
        }
 
        b->field     = vb->field;
-       b->timestamp = ns_to_timeval(vb->ts);
+       v4l2_buffer_set_timestamp(b, vb->ts);
        b->bytesused = vb->size;
        b->sequence  = vb->field_count >> 1;
 }
@@ -578,7 +579,7 @@ int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b)
                    || q->type == V4L2_BUF_TYPE_SDR_OUTPUT) {
                        buf->size = b->bytesused;
                        buf->field = b->field;
-                       buf->ts = v4l2_timeval_to_ns(&b->timestamp);
+                       buf->ts = v4l2_buffer_get_timestamp(b);
                }
                break;
        case V4L2_MEMORY_USERPTR:

diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index d8c29e0..150ee16 100644 (file)
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -14,6 +14,7 @@
 #ifndef V4L2_COMMON_H_
 #define V4L2_COMMON_H_
 
+#include <linux/time.h>
 #include <media/v4l2-dev.h>
 
 /* Common printk constructs for v4l-i2c drivers. These macros create a unique
@@ -518,4 +519,24 @@ int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat,
 int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat,
                        u32 width, u32 height);
 
+static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf)
+{
+       /*
+        * When the timestamp comes from 32-bit user space, there may be
+        * uninitialized data in tv_usec, so cast it to u32.
+        * Otherwise allow invalid input for backwards compatibility.
+        */
+       return buf->timestamp.tv_sec * NSEC_PER_SEC +
+               (u32)buf->timestamp.tv_usec * NSEC_PER_USEC;
+}
+
+static inline void v4l2_buffer_set_timestamp(struct v4l2_buffer *buf,
+                                            u64 timestamp)
+{
+       struct timespec64 ts = ns_to_timespec64(timestamp);
+
+       buf->timestamp.tv_sec  = ts.tv_sec;
+       buf->timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+}
+
 #endif /* V4L2_COMMON_H_ */

diff --git a/include/trace/events/v4l2.h b/include/trace/events/v4l2.h
index 83860de..248bc09 100644 (file)
--- a/include/trace/events/v4l2.h
+++ b/include/trace/events/v4l2.h
@@ -130,7 +130,7 @@ 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_buffer_get_timestamp(buf);
                __entry->timecode_type = buf->timecode.type;
                __entry->timecode_flags = buf->timecode.flags;
                __entry->timecode_frames = buf->timecode.frames;

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 04481c7..6ef4a5b 100644 (file)
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1017,6 +1017,7 @@ struct v4l2_buffer {
        };
 };
 
+#ifndef __KERNEL__
 /**
  * v4l2_timeval_to_ns - Convert timeval to nanoseconds
  * @ts:                pointer to the timeval variable to be converted
@@ -1028,6 +1029,7 @@ static inline __u64 v4l2_timeval_to_ns(const struct timeval *tv)
 {
        return (__u64)tv->tv_sec * 1000000000ULL + tv->tv_usec * 1000;
 }
+#endif
 
 /*  Flags for 'flags' field */
 /* Buffer is mapped (flag) */