From patchwork Wed Nov 6 19:47:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 11231033 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1AB72139A for ; Wed, 6 Nov 2019 19:48:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EAC6B217D7 for ; Wed, 6 Nov 2019 19:48:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728263AbfKFTsJ (ORCPT ); Wed, 6 Nov 2019 14:48:09 -0500 Received: from mout.kundenserver.de ([212.227.17.24]:33363 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729036AbfKFTrn (ORCPT ); Wed, 6 Nov 2019 14:47:43 -0500 Received: from threadripper.lan ([149.172.19.189]) by mrelayeu.kundenserver.de (mreue109 [212.227.15.145]) with ESMTPA (Nemesis) id 1MG9c2-1iivwy2y5c-00GcxA; Wed, 06 Nov 2019 20:47:28 +0100 From: Arnd Bergmann To: Hans Verkuil , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, y2038@lists.linaro.org, Boris Brezillon , Maxime Ripard , Laurent Pinchart , Tiffany Lin , Daniel Mentz , Arnd Bergmann Subject: [PATCH v3 5/8] media: v4l2-core: fix VIDIOC_DQEVENT for time64 ABI Date: Wed, 6 Nov 2019 20:47:12 +0100 Message-Id: <20191106194715.2238044-6-arnd@arndb.de> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20191106194715.2238044-1-arnd@arndb.de> References: <20191106194715.2238044-1-arnd@arndb.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:OtsoNIOiObwbn/wM1A3bLuSoKzPwIKJ6+XdchmxPBJonyoIKh5Y 0iR+6eS9zZrh90AnDzxvF3TR5G+jSovPczaGG8/H3YdbOyXPxEvqXm5fH1wZL+KnQ1X9rIU 8s2JdR5hOsieVChp2PbMMlFYXh4gKC80/85ss6vR7IBhbZk7u9tPikBc51yWB0yy/3xbuql 4WG77levMWbgO4PiYcPLg== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:ddCe9lWZClk=:s/ArC9s92DlYvQ+Aw3NoM5 9XLptxP2Vgfob7+xuRM0Jtp6vYzKmAl0Kdx3kGBCIRCBaOQiGUoLzxCkhUuMpCtC5GvLSCfSm zEWJfuEoJYkchHpaHEqlUWVM5f7nxVQMAE0ABecSeEROyrAIqEBUlTd0OO9XLBPjIprOmi8Bz gKqLxyxw/99FlxcU4miTxVbXC4QF+EHHxOGuLgoRrRqFIzyioAQJo0Hny51TkLeuQmmE+/+77 xzmxfb+k4f4EnL2EQV7qrSGCyWrZuovg2DBt6SnLiBpZAW58zn6fxomnvIMDBnnPzp0LueQ/A pQrtdqq3pSBi72u/sZLzvZmuJJjdiJsAcCpecMs1IDaXWE3Q1rii83s3DjuhaEoRZH3uu82Ue E3T6SjWqlMJGBq9vbC2VcCHukeKpDQThaMiP5ybqiTjwrD2+BmtA6jYLwWy89K3iE7d/8gmmW 685dGjxhIabPCljFqupw/rkOgf0fMBq0UsTHrw8tuFAR21i6/gDu7Sty3hprNwdux5MzA6lNf aMoO/zUTXDrDtvpWWXD/HEm74S5n+B4icmPvm9Kv063eP7sIscS1FvznjwiIiBQO4e24AT3GP Kb1MlCVZ018Bj0Gnta9Kz8vpAEWXnoFniF/JsQMrnylrqcocibFi5FSSGiVxtAYKqq1TJXMgy wRFck6PyhHgYm4TrzWalcsTGy46EIY5YS71Hc+i+S3Hgh9UijbTn/lHAnGwm04uWTVwS+eedr 4Z06B1UD1n9rMh5nWOBwpwBl8OxsY05FTNiuoWoq9vaaL0i9bi+gu4Gu+Gh6oR5ykIqMy6VUm luYHdSOHIQaZtI0Z5Pg6GhQLdOgNelzdbhVpnA6chbkDeuWAXEtewsBNnB3WUYqHQXgp54nsy 76hqEnWOXgSg+SZpQlhg== Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The v4l2_event structure contains a 'struct timespec' member that is defined by the user space C library, creating an ABI incompatibility when that gets updated to a 64-bit time_t. While passing a 32-bit time_t here would be sufficient for CLOCK_MONOTONIC timestamps, simply redefining the structure to use the kernel's __kernel_old_timespec would not work for any library that uses a copy of the linux/videodev2.h header file rather than including the copy from the latest kernel headers. This means the kernel has to be changed to handle both versions of the structure layout on a 32-bit architecture. The easiest way to do this is during the copy from/to user space. Signed-off-by: Arnd Bergmann --- drivers/media/v4l2-core/v4l2-event.c | 5 ++++- drivers/media/v4l2-core/v4l2-ioctl.c | 22 ++++++++++++++++++++ drivers/media/v4l2-core/v4l2-subdev.c | 20 +++++++++++++++++- include/uapi/linux/videodev2.h | 30 +++++++++++++++++++++++++++ 4 files changed, 75 insertions(+), 2 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c index 9d673d113d7a..290c6b213179 100644 --- a/drivers/media/v4l2-core/v4l2-event.c +++ b/drivers/media/v4l2-core/v4l2-event.c @@ -27,6 +27,7 @@ static unsigned sev_pos(const struct v4l2_subscribed_event *sev, unsigned idx) static int __v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event) { struct v4l2_kevent *kev; + struct timespec64 ts; unsigned long flags; spin_lock_irqsave(&fh->vdev->fh_lock, flags); @@ -44,7 +45,9 @@ static int __v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event) kev->event.pending = fh->navailable; *event = kev->event; - event->timestamp = ns_to_timespec(kev->ts); + ts = ns_to_timespec64(kev->ts); + event->timestamp.tv_sec = ts.tv_sec; + event->timestamp.tv_nsec = ts.tv_nsec; kev->sev->first = sev_pos(kev->sev, 1); kev->sev->in_use--; diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c index 50612b4749d3..b8aca0d174bd 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -3025,6 +3025,13 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size, static unsigned int video_translate_cmd(unsigned int cmd) { + switch (cmd) { +#ifdef CONFIG_COMPAT_32BIT_TIME + case VIDIOC_DQEVENT_TIME32: + return VIDIOC_DQEVENT; +#endif + } + return cmd; } @@ -3074,6 +3081,21 @@ static int video_put_user(void __user *arg, void *parg, unsigned int cmd) return 0; switch (cmd) { +#ifdef CONFIG_COMPAT_32BIT_TIME + case VIDIOC_DQEVENT_TIME32: { + struct v4l2_event_time32 ev32; + struct v4l2_event *ev = parg; + + memcpy(&ev32, ev, offsetof(struct v4l2_event, timestamp)); + ev32.timestamp.tv_sec = ev->timestamp.tv_sec; + ev32.timestamp.tv_nsec = ev->timestamp.tv_nsec; + memcpy(&ev32.id, &ev->id, sizeof(*ev) - offsetof(struct v4l2_event, id)); + + if (copy_to_user(arg, &ev32, sizeof(ev32))) + return -EFAULT; + break; + } +#endif default: /* Copy results into user buffer */ if (copy_to_user(arg, parg, _IOC_SIZE(cmd))) diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index 9e987c0f840e..77b77807aaca 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -331,8 +331,8 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) struct v4l2_fh *vfh = file->private_data; #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); - int rval; #endif + int rval; switch (cmd) { case VIDIOC_QUERYCTRL: @@ -392,6 +392,24 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK); + case VIDIOC_DQEVENT_TIME32: { + struct v4l2_event_time32 *ev32 = arg; + struct v4l2_event ev; + + if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) + return -ENOIOCTLCMD; + + rval = v4l2_event_dequeue(vfh, &ev, file->f_flags & O_NONBLOCK); + + memcpy(ev32, &ev, offsetof(struct v4l2_event, timestamp)); + ev32->timestamp.tv_sec = ev.timestamp.tv_sec; + ev32->timestamp.tv_nsec = ev.timestamp.tv_nsec; + memcpy(&ev32->id, &ev.id, + sizeof(ev) - offsetof(struct v4l2_event, id)); + + return rval; + } + case VIDIOC_SUBSCRIBE_EVENT: return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg); diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index 5de1e37995c0..e38afa71a327 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -2340,11 +2340,40 @@ struct v4l2_event { } u; __u32 pending; __u32 sequence; +#ifdef __KERNEL__ + struct __kernel_timespec timestamp; +#else struct timespec timestamp; +#endif __u32 id; __u32 reserved[8]; }; +#ifdef __KERNEL__ +/* + * The user space interpretation of the 'v4l2_event' differs + * based on the 'time_t' definition on 32-bit architectures, so + * the kernel has to handle both. + * This is the old version for 32-bit architectures. + */ +struct v4l2_event_time32 { + __u32 type; + union { + struct v4l2_event_vsync vsync; + struct v4l2_event_ctrl ctrl; + struct v4l2_event_frame_sync frame_sync; + struct v4l2_event_src_change src_change; + struct v4l2_event_motion_det motion_det; + __u8 data[64]; + } u; + __u32 pending; + __u32 sequence; + struct old_timespec32 timestamp; + __u32 id; + __u32 reserved[8]; +}; +#endif + #define V4L2_EVENT_SUB_FL_SEND_INITIAL (1 << 0) #define V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK (1 << 1) @@ -2497,6 +2526,7 @@ struct v4l2_create_buffers { #define VIDIOC_S_DV_TIMINGS _IOWR('V', 87, struct v4l2_dv_timings) #define VIDIOC_G_DV_TIMINGS _IOWR('V', 88, struct v4l2_dv_timings) #define VIDIOC_DQEVENT _IOR('V', 89, struct v4l2_event) +#define VIDIOC_DQEVENT_TIME32 _IOR('V', 89, struct v4l2_event_time32) #define VIDIOC_SUBSCRIBE_EVENT _IOW('V', 90, struct v4l2_event_subscription) #define VIDIOC_UNSUBSCRIBE_EVENT _IOW('V', 91, struct v4l2_event_subscription) #define VIDIOC_CREATE_BUFS _IOWR('V', 92, struct v4l2_create_buffers)