09 Jul, 2014

3 commits

• 3c3b177a9   reservation: add suppport for read-only access using rcu ... Browse Code »

  This adds some extra functions to deal with rcu.

  reservation_object_get_fences_rcu() will obtain the list of shared
  and exclusive fences without obtaining the ww_mutex.

  reservation_object_wait_timeout_rcu() will wait on all fences of the
  reservation_object, without obtaining the ww_mutex.

  reservation_object_test_signaled_rcu() will test if all fences of the
  reservation_object are signaled without using the ww_mutex.

  reservation_object_get_excl and reservation_object_get_list require
  the reservation object to be held, updating requires
  write_seqcount_begin/end. If only the exclusive fence is needed,
  rcu_dereference followed by fence_get_rcu can be used, if the shared
  fences are needed it's recommended to use the supplied functions.

  Signed-off-by: Maarten Lankhorst
  Acked-by: Sumit Semwal
  Acked-by: Daniel Vetter
  Reviewed-By: Thomas Hellstrom
  Signed-off-by: Greg Kroah-Hartman

  Maarten Lankhorst

  2014-07-09 04:41:08 +0800  
• 04a5faa8c   reservation: update api and add some helpers ... Browse Code »

  Move the list of shared fences to a struct, and return it in
  reservation_object_get_list().
  Add reservation_object_get_excl to get the exclusive fence.

  Add reservation_object_reserve_shared(), which reserves space
  in the reservation_object for 1 more shared fence.

  reservation_object_add_shared_fence() and
  reservation_object_add_excl_fence() are used to assign a new
  fence to a reservation_object pointer, to complete a reservation.

  Changes since v1:
  - Add reservation_object_get_excl, reorder code a bit.

  Signed-off-by: Maarten Lankhorst
  Acked-by: Sumit Semwal
  Acked-by: Daniel Vetter
  Signed-off-by: Greg Kroah-Hartman

  Maarten Lankhorst

  2014-07-09 04:37:35 +0800  
• 0ba6b8fb9   reservation: add support for fences to enable cross-device synchronisation ... Browse Code »

  Signed-off-by: Maarten Lankhorst
  Acked-by: Sumit Semwal
  Acked-by: Daniel Vetter
  Reviewed-by: Rob Clark
  Signed-off-by: Greg Kroah-Hartman

  Maarten Lankhorst

  2014-07-09 04:36:14 +0800  

12 Jul, 2013

1 commit

• 1b375dc30   mutex: Move ww_mutex definitions to ww_mutex.h ... Browse Code »

  Move the definitions for wound/wait mutexes out to a separate
  header, ww_mutex.h. This reduces clutter in mutex.h, and
  increases readability.

  Suggested-by: Linus Torvalds
  Signed-off-by: Maarten Lankhorst
  Acked-by: Peter Zijlstra
  Acked-by: Rik van Riel
  Acked-by: Maarten Lankhorst
  Cc: Dave Airlie
  Link: http://lkml.kernel.org/r/51D675DC.3000907@canonical.com
  [ Tidied up the code a bit. ]
  Signed-off-by: Ingo Molnar

  Maarten Lankhorst

  2013-07-12 18:07:46 +0800  

28 Jun, 2013

1 commit

• 786d7257e   reservation: cross-device reservation support, v4 ... Browse Code »

  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
  Reviewed-by: Jerome Glisse
  Signed-off-by: Dave Airlie

  Maarten Lankhorst

  2013-06-28 10:02:15 +0800