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@arndb.de --- 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)