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From: Jacopo Mondi <jacopo@jmondi.org>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: "Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>,
	"Sakari Ailus" <sakari.ailus@linux.intel.com>,
	"Benoit Parrot" <bparrot@ti.com>,
	linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH v2 17/30] v4l: subdev: compat: Implement handling for VIDIOC_SUBDEV_[GS]_ROUTING
Date: Mon, 18 Feb 2019 12:21:09 +0100
Message-ID: <20190218112109.slu6kkcbwb6fn2hr@uno.localdomain> (raw)
In-Reply-To: <20190115235303.GG31088@pendragon.ideasonboard.com>

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Hi Laurent, Sakari,

On Wed, Jan 16, 2019 at 01:53:03AM +0200, Laurent Pinchart wrote:
> Hi Niklas,
>
> Thank you for the patch.
>
> On Fri, Nov 02, 2018 at 12:31:31AM +0100, Niklas Söderlund wrote:
> > From: Sakari Ailus <sakari.ailus@linux.intel.com>
> >
> > Implement compat IOCTL handling for VIDIOC_SUBDEV_G_ROUTING and
> > VIDIOC_SUBDEV_S_ROUTING IOCTLs.
>
> Let's instead design the ioctl in a way that doesn't require compat
> handling.
>

Care to explain what makes this ioctl require a compat version? I
don't see assumptions on the word length on the implementation. What
am I missing?

Thanks
  j

> > Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> > ---
> >  drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 77 +++++++++++++++++++
> >  1 file changed, 77 insertions(+)
> >
> > diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> > index 6481212fda772c73..83af332763f41a6b 100644
> > --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> > +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> > @@ -1045,6 +1045,66 @@ static int put_v4l2_event32(struct v4l2_event __user *p64,
> >  	return 0;
> >  }
> >
> > +struct v4l2_subdev_routing32 {
> > +	compat_caddr_t routes;
> > +	__u32 num_routes;
> > +	__u32 reserved[5];
> > +};
> > +
> > +static int get_v4l2_subdev_routing(struct v4l2_subdev_routing __user *p64,
> > +				   struct v4l2_subdev_routing32 __user *p32)
> > +{
> > +	struct v4l2_subdev_route __user *routes;
> > +	compat_caddr_t p;
> > +	u32 num_routes;
> > +
> > +	if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
> > +	    get_user(p, &p32->routes) ||
> > +	    get_user(num_routes, &p32->num_routes) ||
> > +	    put_user(num_routes, &p64->num_routes) ||
> > +	    copy_in_user(&p64->reserved, &p32->reserved,
> > +			 sizeof(p64->reserved)) ||
> > +	    num_routes > U32_MAX / sizeof(*p64->routes))
> > +		return -EFAULT;
> > +
> > +	routes = compat_ptr(p);
> > +
> > +	if (!access_ok(VERIFY_READ, routes,
> > +		       num_routes * sizeof(*p64->routes)))
> > +		return -EFAULT;
> > +
> > +	if (put_user((__force struct v4l2_subdev_route *)routes,
> > +		     &p64->routes))
> > +		return -EFAULT;
> > +
> > +	return 0;
> > +}
> > +
> > +static int put_v4l2_subdev_routing(struct v4l2_subdev_routing __user *p64,
> > +				   struct v4l2_subdev_routing32 __user *p32)
> > +{
> > +	struct v4l2_subdev_route __user *routes;
> > +	compat_caddr_t p;
> > +	u32 num_routes;
> > +
> > +	if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
> > +	    get_user(p, &p32->routes) ||
> > +	    get_user(num_routes, &p64->num_routes) ||
> > +	    put_user(num_routes, &p32->num_routes) ||
> > +	    copy_in_user(&p32->reserved, &p64->reserved,
> > +			 sizeof(p64->reserved)) ||
> > +	    num_routes > U32_MAX / sizeof(*p64->routes))
> > +		return -EFAULT;
> > +
> > +	routes = compat_ptr(p);
> > +
> > +	if (!access_ok(VERIFY_WRITE, routes,
> > +		       num_routes * sizeof(*p64->routes)))
> > +		return -EFAULT;
> > +
> > +	return 0;
> > +}
> > +
> >  struct v4l2_edid32 {
> >  	__u32 pad;
> >  	__u32 start_block;
> > @@ -1117,6 +1177,8 @@ static int put_v4l2_edid32(struct v4l2_edid __user *p64,
> >  #define VIDIOC_STREAMOFF32	_IOW ('V', 19, s32)
> >  #define VIDIOC_G_INPUT32	_IOR ('V', 38, s32)
> >  #define VIDIOC_S_INPUT32	_IOWR('V', 39, s32)
> > +#define VIDIOC_SUBDEV_G_ROUTING32 _IOWR('V', 38, struct v4l2_subdev_routing32)
> > +#define VIDIOC_SUBDEV_S_ROUTING32 _IOWR('V', 39, struct v4l2_subdev_routing32)
> >  #define VIDIOC_G_OUTPUT32	_IOR ('V', 46, s32)
> >  #define VIDIOC_S_OUTPUT32	_IOWR('V', 47, s32)
> >
> > @@ -1195,6 +1257,8 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
> >  	case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
> >  	case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
> >  	case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
> > +	case VIDIOC_SUBDEV_G_ROUTING32: cmd = VIDIOC_SUBDEV_G_ROUTING; break;
> > +	case VIDIOC_SUBDEV_S_ROUTING32: cmd = VIDIOC_SUBDEV_S_ROUTING; break;
> >  	case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break;
> >  	case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;
> >  	case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
> > @@ -1227,6 +1291,15 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
> >  		compatible_arg = 0;
> >  		break;
> >
> > +	case VIDIOC_SUBDEV_G_ROUTING:
> > +	case VIDIOC_SUBDEV_S_ROUTING:
> > +		err = alloc_userspace(sizeof(struct v4l2_subdev_routing),
> > +				      0, &new_p64);
> > +		if (!err)
> > +			err = get_v4l2_subdev_routing(new_p64, p32);
> > +		compatible_arg = 0;
> > +		break;
> > +
> >  	case VIDIOC_G_EDID:
> >  	case VIDIOC_S_EDID:
> >  		err = alloc_userspace(sizeof(struct v4l2_edid), 0, &new_p64);
> > @@ -1368,6 +1441,10 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
> >  		if (put_v4l2_edid32(new_p64, p32))
> >  			err = -EFAULT;
> >  		break;
> > +	case VIDIOC_SUBDEV_G_ROUTING:
> > +	case VIDIOC_SUBDEV_S_ROUTING:
> > +		err = put_v4l2_subdev_routing(new_p64, p32);
> > +		break;
> >  	}
> >  	if (err)
> >  		return err;
>
> --
> Regards,
>
> Laurent Pinchart

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  parent reply index

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-01 23:31 [PATCH v2 00/30] v4l: add support for multiplexed streams Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 01/30] media: entity: Use pad as a starting point for graph walk Niklas Söderlund
2019-01-15 21:43   ` Laurent Pinchart
2018-11-01 23:31 ` [PATCH v2 02/30] media: entity: Use pads instead of entities in the media graph walk stack Niklas Söderlund
2019-01-15 22:03   ` Laurent Pinchart
2019-01-15 22:13     ` Sakari Ailus
2019-01-15 22:07   ` Laurent Pinchart
2018-11-01 23:31 ` [PATCH v2 03/30] media: entity: Walk the graph based on pads Niklas Söderlund
2019-01-15 22:21   ` Laurent Pinchart
     [not found]     ` <20190115223406.mxgzl36cp54gb7nv@kekkonen.localdomain>
2019-01-15 23:28       ` Laurent Pinchart
2019-01-22 14:50         ` Sakari Ailus
2019-02-14 15:15   ` Jacopo Mondi
2018-11-01 23:31 ` [PATCH v2 04/30] v4l: mc: Start walk from a specific pad in use count calculation Niklas Söderlund
2019-01-15 22:24   ` Laurent Pinchart
2019-01-15 22:36     ` Sakari Ailus
2018-11-01 23:31 ` [PATCH v2 05/30] media: entity: Move the pipeline from entity to pads Niklas Söderlund
2019-01-15 22:38   ` Laurent Pinchart
2019-01-15 22:48     ` Sakari Ailus
2019-02-14 15:53   ` Jacopo Mondi
2018-11-01 23:31 ` [PATCH v2 06/30] media: entity: Use pad as the starting point for a pipeline Niklas Söderlund
2019-01-15 22:54   ` Laurent Pinchart
2019-01-22 15:31     ` Sakari Ailus
2019-01-22 15:37       ` Laurent Pinchart
2019-01-22 16:16         ` Sakari Ailus
2018-11-01 23:31 ` [PATCH v2 07/30] media: entity: Add has_route entity operation Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 08/30] media: entity: Add media_has_route() function Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 09/30] media: entity: Swap pads if route is checked from source to sink Niklas Söderlund
2019-01-15 22:57   ` Laurent Pinchart
2019-01-22 15:15     ` Sakari Ailus
2019-01-22 15:20       ` Laurent Pinchart
2019-02-18  9:21         ` Jacopo Mondi
2019-02-22 12:18           ` Laurent Pinchart
2019-03-04 12:35             ` Jacopo Mondi
2019-03-05 20:04               ` Laurent Pinchart
2019-03-06  8:29                 ` Jacopo Mondi
2018-11-01 23:31 ` [PATCH v2 10/30] media: entity: Use routing information during graph traversal Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 11/30] media: entity: Skip link validation for pads to which there is no route to Niklas Söderlund
2019-01-15 23:13   ` Laurent Pinchart
2018-11-01 23:31 ` [PATCH v2 12/30] media: entity: Add an iterator helper for connected pads Niklas Söderlund
2019-01-15 23:24   ` Laurent Pinchart
2019-01-22 15:36     ` Sakari Ailus
2019-01-22 15:38       ` Laurent Pinchart
2019-01-22 16:21         ` Sakari Ailus
2018-11-01 23:31 ` [PATCH v2 13/30] media: entity: Add only connected pads to the pipeline Niklas Söderlund
2019-01-15 23:33   ` Laurent Pinchart
2018-11-01 23:31 ` [PATCH v2 14/30] media: entity: Add debug information in graph walk route check Niklas Söderlund
2019-01-15 23:35   ` Laurent Pinchart
2019-01-22 15:38     ` Sakari Ailus
2018-11-01 23:31 ` [PATCH v2 15/30] media: entity: Look for indirect routes Niklas Söderlund
2019-01-15 23:41   ` Laurent Pinchart
2019-01-22 15:56     ` Sakari Ailus
2018-11-01 23:31 ` [PATCH v2 16/30] v4l: subdev: Add [GS]_ROUTING subdev ioctls and operations Niklas Söderlund
2019-01-15 23:51   ` Laurent Pinchart
2019-01-22 16:14     ` Sakari Ailus
2019-01-22 17:00       ` Laurent Pinchart
2019-02-21 14:59     ` Jacopo Mondi
2019-02-21 23:49       ` Sakari Ailus
2019-02-22  8:46         ` Jacopo Mondi
2019-02-21 14:39   ` Jacopo Mondi
2019-02-21 22:31     ` Sakari Ailus
2019-02-22  8:40       ` Jacopo Mondi
2019-02-22 11:04         ` Sakari Ailus
2019-02-22 11:17           ` Jacopo Mondi
2019-02-22 11:29             ` Sakari Ailus
2019-02-22 13:37               ` Ian Arkver
2019-02-22 13:50               ` Geert Uytterhoeven
2018-11-01 23:31 ` [PATCH v2 17/30] v4l: subdev: compat: Implement handling for VIDIOC_SUBDEV_[GS]_ROUTING Niklas Söderlund
2019-01-08 10:04   ` Geert Uytterhoeven
2019-01-15 23:53   ` Laurent Pinchart
2019-01-22 15:57     ` Sakari Ailus
2019-02-18 11:21     ` Jacopo Mondi [this message]
2019-02-21 23:50       ` Sakari Ailus
2018-11-01 23:31 ` [PATCH v2 18/30] v4l: subdev: Take routing information into account in link validation Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 19/30] v4l: subdev: Improve link format validation debug messages Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 20/30] v4l: mc: Add an S_ROUTING helper function for power state changes Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 21/30] v4l: Add bus type to frame descriptors Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 22/30] v4l: Add CSI-2 bus configuration " Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 23/30] v4l: Add stream to frame descriptor Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 24/30] adv748x: csi2: add translation from pixelcode to CSI-2 datatype Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 25/30] adv748x: csi2: only allow formats on sink pads Niklas Söderlund
2019-02-21 14:18   ` Jacopo Mondi
2018-11-01 23:31 ` [PATCH v2 26/30] adv748x: csi2: describe the multiplexed stream Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 27/30] adv748x: csi2: add internal routing configuration Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 28/30] adv748x: afe: add routing support Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 29/30] rcar-csi2: use frame description information to configure CSI-2 bus Niklas Söderlund
2018-11-01 23:31 ` [PATCH v2 30/30] rcar-csi2: expose the subdevice internal routing Niklas Söderlund
2018-11-14 13:10   ` Nikita Yushchenko
2018-11-14 19:45     ` Niklas Söderlund
2018-12-03 22:16 ` [PATCH v2 00/30] v4l: add support for multiplexed streams Sakari Ailus
2018-12-05 22:09   ` Niklas Söderlund

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