[PATCH v2 8/9] [media] handle 64-bit time_t in v4l2_buffer
From: Arnd Bergmann
Date: Thu Sep 17 2015 - 17:21:04 EST
This is the final change to enable user space with 64-bit time_t
in the core v4l2 code.
Four ioctls are affected here: VIDIOC_QUERYBUF, VIDIOC_QBUF,
VIDIOC_DQBUF, and VIDIOC_PREPARE_BUF. All of them pass a
struct v4l2_buffer, which can either contain a 32-bit time_t
or a 64-bit time on 32-bit architectures.
In this patch, we redefine the in-kernel version of this structure
to use the 64-bit __s64 type through the use of v4l2_timeval.
This means the normal ioctl handling now assumes 64-bit time_t
and so we have to add support for 32-bit time_t in new handlers.
This is somewhat similar to the 32-bit compat handling on 64-bit
architectures, but those also have to modify other fields of
the structure. For now, I leave that compat code alone, as it
handles the normal case (32-bit compat_time_t) correctly, this
has to be done as a follow-up.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/media/v4l2-core/v4l2-ioctl.c | 174 +++++++++++++++++++++++++++++++++--
include/uapi/linux/videodev2.h | 34 ++++++-
2 files changed, 199 insertions(+), 9 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 7aab18dd2ca5..137475c28e8f 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -438,15 +438,14 @@ static void v4l_print_buffer(const void *arg, bool write_only)
const struct v4l2_timecode *tc = &p->timecode;
const struct v4l2_plane *plane;
int i;
+ /* y2038 safe because of monotonic time */
+ unsigned int seconds = p->timestamp.tv_sec;
- pr_cont("%02ld:%02d:%02d.%08ld index=%d, type=%s, "
+ pr_cont("%02d:%02d:%02d.%08ld index=%d, type=%s, "
"flags=0x%08x, field=%s, sequence=%d, memory=%s",
- p->timestamp.tv_sec / 3600,
- (int)(p->timestamp.tv_sec / 60) % 60,
- (int)(p->timestamp.tv_sec % 60),
- (long)p->timestamp.tv_usec,
- p->index,
- prt_names(p->type, v4l2_type_names),
+ seconds / 3600, (seconds / 60) % 60,
+ seconds % 60, (long)p->timestamp.tv_usec,
+ p->index, prt_names(p->type, v4l2_type_names),
p->flags, prt_names(p->field, v4l2_field_names),
p->sequence, prt_names(p->memory, v4l2_memory_names));
@@ -1846,6 +1845,123 @@ static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
return ret ? ret : ops->vidioc_prepare_buf(file, fh, b);
}
+#ifndef CONFIG_64BIT
+static void v4l_get_buffer_time32(struct v4l2_buffer *to,
+ const struct v4l2_buffer_time32 *from)
+{
+ to->index = from->index;
+ to->type = from->type;
+ to->bytesused = from->bytesused;
+ to->flags = from->flags;
+ to->field = from->field;
+ to->timestamp.tv_sec = from->timestamp.tv_sec;
+ to->timestamp.tv_usec = from->timestamp.tv_usec;
+ to->timecode = from->timecode;
+ to->sequence = from->sequence;
+ to->memory = from->memory;
+ to->m.offset = from->m.offset;
+ to->length = from->length;
+ to->reserved2 = from->reserved2;
+ to->reserved = from->reserved;
+}
+
+static void v4l_put_buffer_time32(struct v4l2_buffer_time32 *to,
+ const struct v4l2_buffer *from)
+{
+ to->index = from->index;
+ to->type = from->type;
+ to->bytesused = from->bytesused;
+ to->flags = from->flags;
+ to->field = from->field;
+ to->timestamp.tv_sec = from->timestamp.tv_sec;
+ to->timestamp.tv_usec = from->timestamp.tv_usec;
+ to->timecode = from->timecode;
+ to->sequence = from->sequence;
+ to->memory = from->memory;
+ to->m.offset = from->m.offset;
+ to->length = from->length;
+ to->reserved2 = from->reserved2;
+ to->reserved = from->reserved;
+}
+
+static int v4l_querybuf_time32(const struct v4l2_ioctl_ops *ops,
+ struct file *file, void *fh, void *arg)
+{
+ struct v4l2_buffer buffer;
+ int ret;
+
+ v4l_get_buffer_time32(&buffer, arg);
+ ret = v4l_querybuf(ops, file, fh, &buffer);
+ v4l_put_buffer_time32(arg, &buffer);
+
+ return ret;
+}
+
+static int v4l_qbuf_time32(const struct v4l2_ioctl_ops *ops,
+ struct file *file, void *fh, void *arg)
+{
+ struct v4l2_buffer buffer;
+ int ret;
+
+ v4l_get_buffer_time32(&buffer, arg);
+ ret = v4l_qbuf(ops, file, fh, &buffer);
+ v4l_put_buffer_time32(arg, &buffer);
+
+ return ret;
+}
+
+static int v4l_dqbuf_time32(const struct v4l2_ioctl_ops *ops,
+ struct file *file, void *fh, void *arg)
+{
+ struct v4l2_buffer buffer;
+ int ret;
+
+ v4l_get_buffer_time32(&buffer, arg);
+ ret = v4l_dqbuf(ops, file, fh, &buffer);
+ v4l_put_buffer_time32(arg, &buffer);
+
+ return ret;
+}
+
+static int v4l_prepare_buf_time32(const struct v4l2_ioctl_ops *ops,
+ struct file *file, void *fh, void *arg)
+{
+ struct v4l2_buffer buffer;
+ int ret;
+
+ v4l_get_buffer_time32(&buffer, arg);
+ ret = v4l_prepare_buf(ops, file, fh, &buffer);
+
+ return ret;
+}
+
+static void v4l_print_buffer_time32(const void *arg, bool write_only)
+{
+ struct v4l2_buffer buffer;
+
+ v4l_get_buffer_time32(&buffer, arg);
+ v4l_print_buffer(&buffer, write_only);
+}
+
+#ifdef CONFIG_TRACEPOINTS
+static void trace_v4l2_dqbuf_time32(int minor, const struct v4l2_buffer_time32 *arg)
+{
+ struct v4l2_buffer buffer;
+
+ v4l_get_buffer_time32(&buffer, arg);
+ trace_v4l2_dqbuf(minor, &buffer);
+}
+
+static void trace_v4l2_qbuf_time32(int minor, const struct v4l2_buffer_time32 *arg)
+{
+ struct v4l2_buffer buffer;
+
+ v4l_get_buffer_time32(&buffer, arg);
+ trace_v4l2_qbuf(minor, &buffer);
+}
+#endif
+#endif
+
static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
@@ -2408,12 +2524,21 @@ static struct v4l2_ioctl_info v4l2_ioctls[] = {
IOCTL_INFO_FNC(VIDIOC_S_FMT, v4l_s_fmt, v4l_print_format, INFO_FL_PRIO),
IOCTL_INFO_FNC(VIDIOC_REQBUFS, v4l_reqbufs, v4l_print_requestbuffers, INFO_FL_PRIO | INFO_FL_QUEUE),
IOCTL_INFO_FNC(VIDIOC_QUERYBUF, v4l_querybuf, v4l_print_buffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_buffer, length)),
+#ifndef CONFIG_64BIT
+ IOCTL_INFO_FNC(VIDIOC_QUERYBUF_TIME32, v4l_querybuf_time32, v4l_print_buffer_time32, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_buffer, length)),
+#endif
IOCTL_INFO_STD(VIDIOC_G_FBUF, vidioc_g_fbuf, v4l_print_framebuffer, 0),
IOCTL_INFO_STD(VIDIOC_S_FBUF, vidioc_s_fbuf, v4l_print_framebuffer, INFO_FL_PRIO),
IOCTL_INFO_FNC(VIDIOC_OVERLAY, v4l_overlay, v4l_print_u32, INFO_FL_PRIO),
IOCTL_INFO_FNC(VIDIOC_QBUF, v4l_qbuf, v4l_print_buffer, INFO_FL_QUEUE),
+#ifndef CONFIG_64BIT
+ IOCTL_INFO_FNC(VIDIOC_QBUF_TIME32, v4l_qbuf_time32, v4l_print_buffer_time32, INFO_FL_QUEUE),
+#endif
IOCTL_INFO_STD(VIDIOC_EXPBUF, vidioc_expbuf, v4l_print_exportbuffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_exportbuffer, flags)),
IOCTL_INFO_FNC(VIDIOC_DQBUF, v4l_dqbuf, v4l_print_buffer, INFO_FL_QUEUE),
+#ifndef CONFIG_64BIT
+ IOCTL_INFO_FNC(VIDIOC_DQBUF_TIME32, v4l_dqbuf_time32, v4l_print_buffer_time32, INFO_FL_QUEUE),
+#endif
IOCTL_INFO_FNC(VIDIOC_STREAMON, v4l_streamon, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
IOCTL_INFO_FNC(VIDIOC_STREAMOFF, v4l_streamoff, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
IOCTL_INFO_FNC(VIDIOC_G_PARM, v4l_g_parm, v4l_print_streamparm, INFO_FL_CLEAR(v4l2_streamparm, type)),
@@ -2479,6 +2604,9 @@ static struct v4l2_ioctl_info v4l2_ioctls[] = {
IOCTL_INFO_FNC(VIDIOC_UNSUBSCRIBE_EVENT, v4l_unsubscribe_event, v4l_print_event_subscription, 0),
IOCTL_INFO_FNC(VIDIOC_CREATE_BUFS, v4l_create_bufs, v4l_print_create_buffers, INFO_FL_PRIO | INFO_FL_QUEUE),
IOCTL_INFO_FNC(VIDIOC_PREPARE_BUF, v4l_prepare_buf, v4l_print_buffer, INFO_FL_QUEUE),
+#ifndef CONFIG_64BIT
+ IOCTL_INFO_FNC(VIDIOC_PREPARE_BUF_TIME32, v4l_prepare_buf_time32, v4l_print_buffer_time32, INFO_FL_QUEUE),
+#endif
IOCTL_INFO_STD(VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings, v4l_print_enum_dv_timings, 0),
IOCTL_INFO_STD(VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings, v4l_print_dv_timings, 0),
IOCTL_INFO_STD(VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap, v4l_print_dv_timings_cap, INFO_FL_CLEAR(v4l2_dv_timings_cap, type)),
@@ -2608,6 +2736,12 @@ done:
(cmd == VIDIOC_QBUF || cmd == VIDIOC_DQBUF))
return ret;
+#ifndef CONFIG_64BIT
+ if (!(dev_debug & V4L2_DEV_DEBUG_STREAMING) &&
+ (cmd == VIDIOC_QBUF_TIME32 || cmd == VIDIOC_DQBUF_TIME32))
+ return ret;
+#endif
+
v4l_printk_ioctl(video_device_node_name(vfd), cmd);
if (ret < 0)
pr_cont(": error %ld", ret);
@@ -2630,6 +2764,26 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
int ret = 0;
switch (cmd) {
+#ifndef CONFIG_64BIT
+ case VIDIOC_PREPARE_BUF_TIME32:
+ case VIDIOC_QUERYBUF_TIME32:
+ case VIDIOC_QBUF_TIME32:
+ case VIDIOC_DQBUF_TIME32: {
+ struct v4l2_buffer_time32 *buf = parg;
+
+ if (V4L2_TYPE_IS_MULTIPLANAR(buf->type) && buf->length > 0) {
+ if (buf->length > VIDEO_MAX_PLANES) {
+ ret = -EINVAL;
+ break;
+ }
+ *user_ptr = (void __user *)buf->m.planes;
+ *kernel_ptr = (void **)&buf->m.planes;
+ *array_size = sizeof(struct v4l2_plane) * buf->length;
+ ret = 1;
+ }
+ break;
+ }
+#endif
case VIDIOC_PREPARE_BUF:
case VIDIOC_QUERYBUF:
case VIDIOC_QBUF:
@@ -2774,6 +2928,12 @@ video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
trace_v4l2_dqbuf(video_devdata(file)->minor, parg);
else if (cmd == VIDIOC_QBUF)
trace_v4l2_qbuf(video_devdata(file)->minor, parg);
+#ifndef CONFIG_64BIT
+ else if (cmd == VIDIOC_DQBUF_TIME32)
+ trace_v4l2_dqbuf_time32(video_devdata(file)->minor, parg);
+ else if (cmd == VIDIOC_QBUF_TIME32)
+ trace_v4l2_qbuf_time32(video_devdata(file)->minor, parg);
+#endif
}
if (has_array_args) {
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 450b3249ba30..0d3688a97ab8 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -811,8 +811,8 @@ struct v4l2_plane {
* time_t, so we have to convert it when accessing user data.
*/
struct v4l2_timeval {
- long tv_sec;
- long tv_usec;
+ __s64 tv_sec;
+ __s64 tv_usec;
};
#endif
@@ -873,6 +873,32 @@ struct v4l2_buffer {
__u32 reserved;
};
+struct v4l2_buffer_time32 {
+ __u32 index;
+ __u32 type;
+ __u32 bytesused;
+ __u32 flags;
+ __u32 field;
+ struct {
+ __s32 tv_sec;
+ __s32 tv_usec;
+ } timestamp;
+ struct v4l2_timecode timecode;
+ __u32 sequence;
+
+ /* memory location */
+ __u32 memory;
+ union {
+ __u32 offset;
+ unsigned long userptr;
+ struct v4l2_plane *planes;
+ __s32 fd;
+ } m;
+ __u32 length;
+ __u32 reserved2;
+ __u32 reserved;
+};
+
/* Flags for 'flags' field */
/* Buffer is mapped (flag) */
#define V4L2_BUF_FLAG_MAPPED 0x00000001
@@ -2216,12 +2242,15 @@ struct v4l2_create_buffers {
#define VIDIOC_S_FMT _IOWR('V', 5, struct v4l2_format)
#define VIDIOC_REQBUFS _IOWR('V', 8, struct v4l2_requestbuffers)
#define VIDIOC_QUERYBUF _IOWR('V', 9, struct v4l2_buffer)
+#define VIDIOC_QUERYBUF_TIME32 _IOWR('V', 9, struct v4l2_buffer_time32)
#define VIDIOC_G_FBUF _IOR('V', 10, struct v4l2_framebuffer)
#define VIDIOC_S_FBUF _IOW('V', 11, struct v4l2_framebuffer)
#define VIDIOC_OVERLAY _IOW('V', 14, int)
#define VIDIOC_QBUF _IOWR('V', 15, struct v4l2_buffer)
+#define VIDIOC_QBUF_TIME32 _IOWR('V', 15, struct v4l2_buffer_time32)
#define VIDIOC_EXPBUF _IOWR('V', 16, struct v4l2_exportbuffer)
#define VIDIOC_DQBUF _IOWR('V', 17, struct v4l2_buffer)
+#define VIDIOC_DQBUF_TIME32 _IOWR('V', 17, struct v4l2_buffer_time32)
#define VIDIOC_STREAMON _IOW('V', 18, int)
#define VIDIOC_STREAMOFF _IOW('V', 19, int)
#define VIDIOC_G_PARM _IOWR('V', 21, struct v4l2_streamparm)
@@ -2292,6 +2321,7 @@ struct v4l2_create_buffers {
versions */
#define VIDIOC_CREATE_BUFS _IOWR('V', 92, struct v4l2_create_buffers)
#define VIDIOC_PREPARE_BUF _IOWR('V', 93, struct v4l2_buffer)
+#define VIDIOC_PREPARE_BUF_TIME32 _IOWR('V', 93, struct v4l2_buffer_time32)
/* Experimental selection API */
#define VIDIOC_G_SELECTION _IOWR('V', 94, struct v4l2_selection)
--
2.1.0.rc2
--
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