nouveau_channel_put() can be executed after the 'refcount == 0' check
in nouveau_channel_get() and before the channel reference count is
incremented. In that case CPU0 will take the context down while CPU1
thinks it owns the channel and 'refcount == 1'.
Signed-off-by: NFrancisco Jerez <currojerez@riseup.net>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

The destroy_context() engine hooks call gpuobj management functions to
release the channel resources, these functions use HARDIRQ-unsafe locks
whereas destroy_context() is called with the HARDIRQ-safe
context_switch_lock held, that's a lock ordering violation.

Push the engine-specific channel destruction logic into destroy_context()
and let the hardware-specific code lock and unlock when it's actually
needed. Change the engine destruction order to avoid a race in the small
gap between pgraph and pfifo context uninitialization.
Reported-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: NFrancisco Jerez <currojerez@riseup.net>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NFrancisco Jerez <currojerez@riseup.net>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

The pushbuf ioctl syncs after validation, no need for this anymore.
Signed-off-by: NFrancisco Jerez <currojerez@riseup.net>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Not used at all yet, but lets hook it up now anyway.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

No other driver uses this, and userspace should be responsible for handling
locking between them if they share BOs.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

This fixes a race condition between fbcon acceleration and TTM buffer
moves.  To reproduce:

- start X
- switch to vt and "while (true); do dmesg; done"
- switch to another vt and "sleep 2 && cat /path/to/debugfs/dri/0/evict_vram"
- switch back to vt running dmesg

We don't make use of this on any other channel yet, they're currently
protected by drm_global_mutex.  This will change in the near future.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

A future commit will add locking to the DRM's channel, and there's numerous
problems that come up if we allow printk from an interrupt context to be
accelerated.  It seems saner to just disallow it completely.

As a nice side-effect, all the "to accel or not to accel" logic gets moved
out of the chipset-specific code.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

* 'drm-radeon-fusion' of ../drm-radeon-next:
  drm/radeon/kms: add Ontario APU ucode loading support
  drm/radeon/kms: add Ontario Fusion APU pci ids
  drm/radeon/kms: enable MSIs on fusion APUs
  drm/radeon/kms: add power table parsing support for Ontario fusion APUs
  drm/radeon/kms: refactor atombios power state fetching
  drm/radeon/kms: add bo blit support for Ontario fusion APUs
  drm/radeon/kms: add thermal sensor support for fusion APUs
  drm/radeon/kms: fill in GPU init for AMD Ontario Fusion APUs
  drm/radeon/kms: add radeon_asic struct for AMD Ontario fusion APUs
  drm/radeon/kms: evergreen.c updates for fusion
  drm/radeon/kms: MC setup changes for fusion APUs
  drm/radeon/kms: move r7xx/evergreen to its own vram_gtt setup function
  drm/radeon/kms: add support for ss overrides on Fusion APUs
  drm/radeon/kms: Add support for external encoders on fusion APUs
  drm/radeon/kms: atom changes for DCE4.1 devices
  drm/radeon/kms: add new family id for AMD Ontario APUs
  drm/radeon/kms: upstream power table updates
  drm/radeon/kms: upstream atombios.h updates
  drm/radeon/kms: upstream ObjectID.h updates
  drm/radeon/kms: setup mc chremap properly on r7xx/evergreen

* 'drm-radeon-next' of ../drm-radeon-next:
  drm/radeon/kms: improve pflip precision on r1xx-r4xx
  drm/kms/radeon: Use high precision timestamps for pageflip completion events.
  drm/kms/radeon: Reorder vblank and pageflip interrupt handling.
  drm/radeon/kms: add pageflip ioctl support (v3)
  drm/kms/radeon: Add support for precise vblank timestamping.

* drm-ttm-next:
  drm/radeon: Use the ttm execbuf utilities
  drm/ttm: Fix up io_mem_reserve / io_mem_free calling
  drm/ttm/vmwgfx: Have TTM manage the validation sequence.
  drm/ttm: Improved fencing of buffer object lists
  drm/ttm/radeon/nouveau: Kill the bo lock in favour of a bo device fence_lock
  drm/ttm: Don't deadlock on recursive multi-bo reservations
  drm/ttm: Optimize ttm_eu_backoff_reservation
  drm/ttm: Use kref_sub instead of repeatedly calling kref_put
  kref: Add a kref_sub function
  drm/ttm: Add a bo list reserve fastpath (v2)

The update pending bit has a separate enable bit.

Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

The vbios power tables on my inagua board seem a bit funky...
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

The function was getting too large.  Rework it to share
more state better handle new power table formats.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

fusion chips only have 2 crtcs.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

- CONFIG_MEMSIZE is in bytes on fusion.
- FB_BASE and FB_TOP are finer grained.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

MC_VM_FB_LOCATION is at a different offset between r6xx and r7xx/evergreen.
The location is needed for vram setup on fusion chips.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

System specific spread spectrum overrides can be specified in
the integrated system info table for Fusion APUs.  This adds
support for using those overrides.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Should improve performance slightly and possibly fix some
issues.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>