From: Daniel Vetter <daniel@ffwll.ch>
To: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Sinclair Yeh <syeh@vmware.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
DRI Development <dri-devel@lists.freedesktop.org>,
linux-graphics-maintainer <linux-graphics-maintainer@vmware.com>,
Daniel Vetter <daniel.vetter@intel.com>
Subject: Re: [PATCH 07/18] drm/vmwgfx: Add FIXME comments for customer page_flip handlers
Date: Wed, 3 Oct 2018 11:11:54 +0200 [thread overview]
Message-ID: <20181003091154.GD23685@phenom.ffwll.local> (raw)
In-Reply-To: <0354b69d-6f32-858d-574f-9444597075c5@vmware.com>
On Tue, Oct 02, 2018 at 04:49:30PM +0000, Thomas Hellstrom wrote:
> Hi, Daniel,
>
> On 10/02/2018 03:35 PM, Daniel Vetter wrote:
> > The idea behind allowing drivers to override legacy ioctls (instead of
> > using the generic implementations unconditionally) is to handle bugs
> > in old driver-specific userspace. Like e.g. vmw_kms_set_config does,
> > to work around some vmwgfx userspace not clearing its ioctl structs
> > properly.
> >
> > But you can't use it to augment semantics and put in additional
> > checks, since from a correctly working userspace's pov there should
> > not be any difference in behaviour between the legacy and the atomic
> > paths.
> >
> > vmwgfx seems to be doing some strange things in its page_flip
> > handlers. Since I'm not an expert of this codebase just wrap some
> > FIXME comments around the potentially problematic code.
> >
>
> We've got proper patches for these. Apparently they got lost in my -next
> pull request, though.
Yeah I wondered why this one here didn't conflict yet, I can carry it
around a bit longer as a memo.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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next prev parent reply other threads:[~2018-10-03 9:11 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-02 13:35 [PATCH 00/18] atomic helper cleanups Daniel Vetter
2018-10-02 13:35 ` [PATCH 01/18] drm/amdgpu: Remove default best_encoder hook from DC Daniel Vetter
2018-10-02 13:35 ` [PATCH 02/18] drm/atomic-helper: Unexport drm_atomic_helper_best_encoder Daniel Vetter
2018-10-02 13:53 ` Laurent Pinchart
2018-10-03 9:08 ` Daniel Vetter
2018-10-04 17:13 ` Laurent Pinchart
2018-10-04 18:33 ` Sean Paul
2018-10-04 19:33 ` [Intel-gfx] " Daniel Vetter
2018-10-02 13:35 ` [PATCH 03/18] drm: Extract drm_atomic_state_helper.[hc] Daniel Vetter
2018-10-02 15:40 ` Ville Syrjälä
2018-10-03 9:10 ` Daniel Vetter
2018-10-02 13:35 ` [PATCH 04/18] drm/vmwgfx: Remove confused comment from vmw_du_connector_atomic_set_property Daniel Vetter
2018-10-02 15:15 ` Ville Syrjälä
2018-10-02 16:36 ` [Intel-gfx] " Thomas Hellstrom
2018-10-02 17:02 ` Ville Syrjälä
2018-10-04 20:03 ` [Intel-gfx] " Daniel Vetter
2018-10-02 13:35 ` [PATCH 05/18] drm/vmwgfx: Don't look at state->allow_modeset Daniel Vetter
2018-10-02 13:35 ` [PATCH 06/18] drm/atomic: Improve docs for drm_atomic_state->allow_modeset Daniel Vetter
2018-10-02 15:40 ` Ville Syrjälä
2018-10-02 13:35 ` [PATCH 07/18] drm/vmwgfx: Add FIXME comments for customer page_flip handlers Daniel Vetter
2018-10-02 16:49 ` Thomas Hellstrom
2018-10-03 9:11 ` Daniel Vetter [this message]
2018-10-02 13:35 ` [PATCH 08/18] drm/arcpgu: Drop transitional hooks Daniel Vetter
2018-10-02 15:34 ` Ville Syrjälä
2018-10-03 9:20 ` [Intel-gfx] " Daniel Vetter
2018-10-02 13:35 ` [PATCH 09/18] drm/atmel: " Daniel Vetter
2018-10-02 15:34 ` [Intel-gfx] " Ville Syrjälä
2018-10-02 13:35 ` [PATCH 10/18] drm/arcpgu: Use drm_atomic_helper_shutdown Daniel Vetter
2018-10-02 15:39 ` Ville Syrjälä
2018-10-03 9:16 ` [PATCH 11/18] drm/msm: " Daniel Vetter
2018-10-03 13:01 ` Ville Syrjälä
2018-10-03 9:17 ` [PATCH 12/18] drm/sti: " Daniel Vetter
2018-10-03 13:07 ` Ville Syrjälä
2018-10-03 9:18 ` [PATCH 13/18] drm/vc4: " Daniel Vetter
2018-10-03 9:18 ` [PATCH 14/18] drm/zte: " Daniel Vetter
2018-10-03 13:08 ` Ville Syrjälä
2018-10-03 9:18 ` [PATCH 15/18] drm: Remove transitional helpers Daniel Vetter
2018-10-03 13:11 ` [Intel-gfx] " Ville Syrjälä
2018-10-03 9:18 ` [PATCH 16/18] drm/vmwgfx: Fix vmw_du_cursor_plane_atomic_check Daniel Vetter
2018-10-03 13:12 ` Ville Syrjälä
2018-10-03 9:18 ` [PATCH 17/18] drm: Unexport drm_plane_helper_check_update Daniel Vetter
2018-10-04 20:30 ` Ville Syrjälä
2018-10-03 9:18 ` [PATCH 18/18] drm: Unexport primary plane helpers Daniel Vetter
2018-10-03 13:15 ` Ville Syrjälä
2018-10-03 13:08 ` [PATCH 13/18] drm/vc4: Use drm_atomic_helper_shutdown Ville Syrjälä
2018-10-03 20:31 ` Eric Anholt
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