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reservation: cross-device reservation support, v4

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This adds support for a generic reservations framework that can be
hooked up to ttm and dma-buf and allows easy sharing of reservations
across devices.

The idea is that a dma-buf and ttm object both will get a pointer
to a struct reservation_object, which has to be reserved before
anything is done with the contents of the dma-buf.

Changes since v1:
 - Fix locking issue in ticket_reserve, which could cause mutex_unlock
   to be called too many times.
Changes since v2:
 - All fence related calls and members have been taken out for now,
   what's left is the bare minimum to be useful for ttm locking conversion.
Changes since v3:
 - Removed helper functions too. The documentation has an example
   implementation for locking. With the move to ww_mutex there is no
   need to have much logic any more.

Signed-off-by: Maarten Lankhorst <[email protected]>
Reviewed-by: Jerome Glisse <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
This commit is contained in:
Maarten Lankhorst 2013-06-27 13:48:16 +02:00 • committed by Dave Airlie
commit 786d7257e5
4 changed files with 104 additions and 1 deletions
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2
Documentation/DocBook/device-drivers.tmpl
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@ -126,6 +126,8 @@ X!Edrivers/base/interface.c
</sect1>
<sect1><title>Device Drivers DMA Management</title>
!Edrivers/base/dma-buf.c
!Edrivers/base/reservation.c
!Iinclude/linux/reservation.h
!Edrivers/base/dma-coherent.c
!Edrivers/base/dma-mapping.c
</sect1>