drm: Update to Linux 4.15.18

* Create /dev/dri/renderD* devices
Generally handle /dev entries creation as close to Linux as possible.

* Add drm master support
Sync authentification code with Li

drm: Update to Linux 4.15.18

* Create /dev/dri/renderD* devices
Generally handle /dev entries creation as close to Linux as possible.

* Add drm master support
Sync authentification code with Linux 4.15.18

* handle vm_mm->mmap_sem in ttm page fault operations

* Update dma-fence code from OpenBSD

* This commit contains sleep/wakeup and other changes
from Matthew Dillon <dillon@apollo.backplane.com>

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drm/linux/tasklets: queue new requests after existing ones

* The i915 driver expects its requests to be processed in the same
order they were submitted

* Insert new tasklets at the tail of regula

drm/linux/tasklets: queue new requests after existing ones

* The i915 driver expects its requests to be processed in the same
order they were submitted

* Insert new tasklets at the tail of regular and high priority lists

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drm/linux/tasklets: Factor out common code

Use a common macro for tasklet_schedule() and tasklet_hi_schedule()

drm/linux: Add tasklet enable and disable functions

Remove a debug message in passing

drm/linux: Rewrite the tasklet implementation

Newer drm/i915 driver versions expect tasklets to run in dedicated
threads and no longer work with synchronous calls.

Thanks to Matthew Dillon for advi

drm/linux: Rewrite the tasklet implementation

Newer drm/i915 driver versions expect tasklets to run in dedicated
threads and no longer work with synchronous calls.

Thanks to Matthew Dillon for advice on locking issues and how best
to resolve mp races.

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