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From: Ilija Hadzic <ihadzic@research.bell-labs.com>
To: Dave Airlie <airlied@gmail.com>
Cc: dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 05/19] drm: move dev_mapping to the minor node
Date: Mon, 30 Apr 2012 11:52:50 -0500 (CDT)	[thread overview]
Message-ID: <Pine.GSO.4.62.1204301147230.8159@umail> (raw)
In-Reply-To: <CAPM=9tyeakH_4ehKQUh7kwzNg5aZ367tf3L+6xqkw+9jpif0HA@mail.gmail.com>



On Mon, 30 Apr 2012, Dave Airlie wrote:

>
> When we move a buffer from VRAM->RAM we have to invalidate all
> userspace mappings for it.
>
> There could be userspace mappings on any of the device nodes, so we
> need to get them all.
>

Ah OK, I get it ... and the reason you don't have to do this when you have 
multiple physical cards, but only one node per card (i.e. current state of 
the code) is that VRAMs of each card are disjoint, so there can't possibly 
be mappings through different /dev/dri/whatever of the same piece of VRAM. 
Multiple render nodes, introduce that possibility.

> I think some of this code could be redone, to be less complex, Al Viro
> questions why we weren't just setting the
> inode mapping ourselves, citing some references in an fs somewhere
> (maybe cifs), I haven't had time to follow up and check.
>
> This would also make the case where you have something else create a
> device node inside a chroot.
>

Do you have pointers to that discussion (assuming it was on sime mailing 
list)? The least I can do, while I am at it, is try to understand it and
see if I can incorporate some ideas from there in the rework of the patch.

-- Ilija

  reply	other threads:[~2012-04-30 16:52 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-12 18:19 [RFC v2] Revive the work on render-nodes branch Ilija Hadzic
2012-04-12 18:19 ` [PATCH 01/19] drm: simplify dereferencing of node type Ilija Hadzic
2012-04-12 18:19 ` [PATCH 02/19] drm: track planes in drm_mode_group structure Ilija Hadzic
2012-04-12 18:19 ` [PATCH 03/19] drm: use drm_mode_group in drm_mode_getplane_res Ilija Hadzic
2012-04-12 18:19 ` [PATCH 04/19] drm: do not push inode down into drm_open_helper Ilija Hadzic
2012-04-12 18:19 ` [PATCH 05/19] drm: move dev_mapping to the minor node Ilija Hadzic
2012-04-20 10:04   ` Dave Airlie
2012-04-30 14:48     ` Ilija Hadzic
2012-04-30 16:39       ` Dave Airlie
2012-04-30 16:52         ` Ilija Hadzic [this message]
2012-04-30 17:53           ` Dave Airlie
2012-04-30 18:04             ` Dave Airlie
2012-05-15 20:48               ` Ilija Hadzic
2012-04-12 18:19 ` [PATCH 06/19] drm: add support for render nodes Ilija Hadzic
2012-04-12 18:19 ` [PATCH 07/19] drm: initial multiple nodes ioctl work Ilija Hadzic
2012-04-20 10:15   ` Dave Airlie
2012-04-12 18:19 ` [PATCH 08/19] drm: separate render node descriptor from minor Ilija Hadzic
2012-04-12 18:19 ` [PATCH 09/19] drm: cleanup render node ioctls Ilija Hadzic
2012-04-12 18:19 ` [PATCH 10/19] drm: only allow render node ioctls through control node Ilija Hadzic
2012-04-12 18:19 ` [PATCH 11/19] drm: do not remove a render node in use Ilija Hadzic
2012-04-12 18:19 ` [PATCH 12/19] drm: allocate correct id_list size for a render node Ilija Hadzic
2012-04-12 18:19 ` [PATCH 13/19] drm: add drm_mode_group_fini function Ilija Hadzic
2012-04-12 18:19 ` [PATCH 14/19] drm: properly free id_list when a render node is removed Ilija Hadzic
2012-04-12 18:19 ` [PATCH 15/19] drm: call drm_mode_group_fini on primary node Ilija Hadzic
2012-04-12 18:19 ` [PATCH 16/19] drm: more elaborate check for resource count Ilija Hadzic
2012-04-12 18:19 ` [PATCH 17/19] drm: validate id list when creating a render node Ilija Hadzic
2012-04-12 18:19 ` [PATCH 18/19] drm: keep track of which node holds which resource Ilija Hadzic
2012-04-12 18:19 ` [PATCH 19/19] drm: hold mutex in critical sections of render-node code Ilija Hadzic
2012-04-12 18:55 ` [RFC v2] Revive the work on render-nodes branch Ville Syrjälä
2012-04-12 19:09   ` Ilija Hadzic
2012-04-20 10:20 ` Dave Airlie
2012-04-20 13:46   ` Daniel Vetter
2012-04-30 15:16   ` Ilija Hadzic
2012-04-30 19:01   ` Kristian Høgsberg

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