drm/nouveau: report channel owner in ioctl error paths

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drm/nouveau/therm: turn on fan only when threshold hit in positive direction

+ the same for shutdown threshold - seems impossible, but shutdown can fail.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Acked-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drm/nv40/therm: reset temperature sensor on init

Current uninitialized sensor detection does not work for me on nv4b and
sensor returns crazy values (>190°C). It stabilises later, but it's too
late - therm code shutdowns the machine...

Let's just reset it on init.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Acked-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drm/nouveau/therm: use workqueue to shutdown the machine

orderly_poweroff cannot be called from atomic context.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Acked-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drm/nouveau: add lockdep annotations

1) Lockdep thinks all nouveau subdevs belong to the same class and can be
locked in arbitrary order, which is not true (at least in general case).
Tell it to distinguish subdevs by (o)class type.
2) DRM client can be locked under user client lock - tell lockdep to put
DRM client lock in a separate class.

Reported-by: Arend van Spriel <arend@broadcom.com>
Reported-by: Peter Hurley <peter@hurleysoftware.com>
Reported-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reported-by: Daniel J Blueman <daniel@quora.org>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: stable@vger.kernel.org [3.7, but needs s/const ofuncs/ofuncs/ to build]
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drm/nouveau/therm: reduce stack usage of nouveau_therm_ic_ctor

Before: 1496 bytes
After:   152 bytes

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drm/nouveau: improve reporting of fifo errors

Note: bar faults and semaphore errors were previously silently acked.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
drm/nouveau: report how much memory userspace tried to "validate"

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
drm/nouveau: restore debugfs support

Restore majority of debugfs support (with an exception of channel info) dropped
in commit ebb945a94bba2ce8dff7b0942ff2b3f2a52a0a69 ("drm/nouveau: port all
engines to new engine module format").

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
drm/nouveau/disp: sizeof() wrong pointer

"data" is a void pointer and "args" is "data" after we have casted it to
a struct.  We care about the size of the struct here.  Btw,
sizeof(*data) is 1.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
drm/nouveau: Fix DPMS 1 on G4 Snowball, from snow white to coal black.

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=40275.

Signed-off-by: Stefan de Konink <stefan@konink.de>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>