linux-toradex.git/drivers/gpu/drm/drm_ioctl.c, branch v3.16.5

drm: Introduce drm_dev_set_unique()

2014-06-05T21:14:32+00:00

Add a helper function that allows drivers to statically set the unique
name of the device. This will allow platform and USB drivers to get rid
of their DRM bus implementations and directly use drm_dev_alloc() and
drm_dev_register().

Reviewed-by: Daniel Vetter 
Reviewed-by: David Herrmann 
Signed-off-by: Thierry Reding

drm: rip out dev->devname

2014-04-23T08:32:52+00:00

This was only ever used to pretty-print the irq driver name. And on
kms systems due to set_version bonghits we never set up the prettier
name, ever. Which make this a bit pointless.

Also, we can always dig out the driver-instance/irq relationship
through other means, so this isn't that useful. So just rip it out to
simplify the set_version/set_busid insanity a bit.

Also delete the temporary busname from drm_pci_set_busid, it's now
unused.

v2: Rebase on top of the new host1x drm_bus for tegra.

Reviewed-by: Thierry Reding 
Reviewed-by: Laurent Pinchart 
Signed-off-by: Daniel Vetter

drm: inline drm_pci_set_unique

2014-04-23T08:32:51+00:00

This is only used for drm versions 1.0, and kms drivers have never
been there. So we can appropriately restrict this to legacy and hence
pci devices and inline everything.

v2: Make the dummy function actually return something, caught by Wu
Fengguang's 0-day tester.

v3: Fix spelling in comment (Thierry)

Reviewed-by: Thierry Reding 
Reviewed-by: Laurent Pinchart 
Signed-off-by: Daniel Vetter

drm: Allow userspace to ask for universal plane list (v2)

2014-04-02T00:18:29+00:00

Userspace clients which wish to receive all DRM planes (primary and
cursor planes in addition to the traditional overlay planes) may set the
DRM_CLIENT_CAP_UNIVERSAL_PLANES capability.

v2: Hide behind drm.universal_planes module option [suggested by
    Daniel Vetter]

Signed-off-by: Matt Roper 
Reviewed-by: Rob Clark

drm: add DRM_CAPs for cursor size

2014-02-18T18:41:01+00:00

Some hardware may not support standard 64x64 cursors.  Add
a drm cap to query the cursor size from the kernel.  Some examples
include radeon CIK parts (128x128 cursors) and armada (32x64 or 64x32).
This allows things like device specific ddxes to remove asics specific
logic and also allows xf86-video-modesetting to work properly with hw
cursors on this hardware. Default to 64 if the driver doesn't specify
a size.

Signed-off-by: Alex Deucher 
Reviewed-by: Rob Clark

drm: Add a STEREO_3D capability to the SET_CLIENT_CAP ioctl

2013-10-01T05:45:27+00:00

This capability allows user space to control the delivery of modes with
the 3D flags set. This is to not play games with current user space
users not knowing anything about stereo 3D flags and that could try
to set a mode with one or several of those bits set.

So, the plan is to remove the stereo modes from the list of modes we
give to DRM clients by default, and let them through if we are being
told otherwise.

stereo_allowed is bound to the drm_file structure to make it a
per-client setting, not a global one.

v2: Replace clearing 3D flags by discarding the stereo modes now that
    they are regular modes.
v3: SET_CAP -> SET_CLIENT_CAP rename (Chris Wilson)

Reviewed-by: Ville Syrjälä 
Signed-off-by: Damien Lespiau 
Acked-by: Dave Airlie 
Signed-off-by: Daniel Vetter

drm: Add a SET_CLIENT_CAP ioctl

2013-10-01T05:45:26+00:00

This ioctl can be used to turn some knobs in a DRM driver. The client
can ask the DRM core for an alternate view of the reality: it can be
useful to be able to instruct the core that the DRM client can handle
new functionnality that would otherwise break current ABI.

v2: Rename to ioctl from SET_CAP to SET_CLIENT_CAP (Chris Wilson)

Reviewed-by: Ville Syrjälä 
Signed-off-by: Damien Lespiau 
Acked-by: Dave Airlie 
Signed-off-by: Daniel Vetter

drm: Advertise async page flip ability through GETCAP ioctl

2013-08-29T23:25:13+00:00

Let applications know whether the kernel supports asynchronous page
flipping.

Signed-off-by: Keith Packard 
Signed-off-by: Dave Airlie

drm: no-op out GET_STATS ioctl

2013-08-19T00:06:24+00:00

Again only used by a tests in libdrm and by dristat. Nowadays we have
much better tracing tools to get detailed insights into what a drm
driver is doing. And for a simple "does it work" kind of question that
these stats could answer we have plenty of dmesg debug log spew.

So I don't see any use for this stat gathering complexity at all.

To be able to gradually drop things start with ripping out the
interfaces to it, here the ioctl.

To prevent dristat from eating its own stack garbage we can't use the
drm_noop ioctl though, since we need to clear the return data with a
memset.

Cc: Eric Anholt 
Signed-off-by: Daniel Vetter 
Reviewed-by: Eric Anholt 
Signed-off-by: Dave Airlie

drm: hollow-out GET_CLIENT ioctl

2013-08-19T00:05:54+00:00

We not only have debugfs files to do pretty much the equivalent of
lsof, we also have an ioctl. Not that compared to lsof this dumps a
wee bit more information, but we can still get at that from debugfs
easily.

I've dug around in mesa, libdrm and ddx histories and the only users
seem to be drm/tests/dristat.c and drm/tests/getclients.c. The later
is a testcase for the ioctl itself since up to

commit b018fcdaa5e8b4eabb8cffda687d00004a3c4785
Author: Eric Anholt 
Date:   Thu Nov 22 18:46:54 2007 +1000

    drm: Make DRM_IOCTL_GET_CLIENT return EINVAL when it can't find client #idx

there was actually no way at all for userspace to enumerate all
clients since the kernel just wouldn't tell it when to stop. Which
completely broke it's only user, dristat -c.

So obviously that ioctl wasn't much use for debugging. Hence I don't
see any point in keeping support for a tool which was pretty obviously
never really used, and while we have good replacements in the form of
equivalent debugfs files.

Still, to keep dristat -c from looping forever again stop it early by
returning an unconditional -EINVAL. Also add a comment in the code
about why.

v2: Slightly less hollowed-out implementation. libva uses GET_CLIENTS
to figure out whether the fd it has is already authenticated or not.
So we need to keep that part of things working. Simplest way is to
just return one entry to keep va_drm_is_authenticated in
libva/va/drm/va_drm_auth.c working.

This is exercised by igt/drm_get_client_auth which contains a
copypasta of the libva auth check code.

Cc: Gwenole Beauchesne 
Cc: David Herrmann 
Reviewed-by: David Herrmann 
Reviewed-by: Eric Anholt 
Signed-off-by: Daniel Vetter 
Signed-off-by: Dave Airlie