litmus-rt.git/drivers/dma-buf, branch master

dma-buf: cleanup dma_buf_export() to make it easily extensible

2015-04-21T09:17:16+00:00

At present, dma_buf_export() takes a series of parameters, which
makes it difficult to add any new parameters for exporters, if required.

Make it simpler by moving all these parameters into a struct, and pass
the struct * as parameter to dma_buf_export().

While at it, unite dma_buf_export_named() with dma_buf_export(), and
change all callers accordingly.

Reviewed-by: Maarten Lankhorst 
Reviewed-by: Daniel Thompson 
Acked-by: Mauro Carvalho Chehab 
Acked-by: Dave Airlie 
Signed-off-by: Sumit Semwal

reservation: Remove shadowing local variable 'ret'

2015-01-22T10:59:31+00:00

It was causing the return value of fence_is_signaled to be ignored, making
reservation objects signal too early.

Cc: stable@vger.kernel.org
Reviewed-by: Maarten Lankhorst 
Reviewed-by: Alex Deucher 
Signed-off-by: Michel Dänzer 
Signed-off-by: Sumit Semwal

dma-buf/fence: don't wait when specified timeout is zero

2015-01-22T05:58:51+00:00

When specified timeout is zero for fence_wait_timeout, just check if the fence
is signaled or not without wait.

Signed-off-by: Jammy Zhou 
Reviewed-by: Christian König 
Reviewed-By: Maarten Lankhorst 
Signed-off-by: Sumit Semwal

reservation: wait only with non-zero timeout specified (v3)

2015-01-22T05:57:57+00:00

When the timeout value passed to reservation_object_wait_timeout_rcu
is zero, no wait should be done if the fences are not signaled.

Return '1' for idle and '0' for busy if the specified timeout is '0'
to keep consistent with the case of non-zero timeout.

v2: call fence_put if not signaled in the case of timeout==0

v3: switch to reservation_object_test_signaled_rcu

Signed-off-by: Jammy Zhou 
Reviewed-by: Christian König 
Reviewed-by: Alex Deucher 
Reviewed-By: Maarten Lankhorst 
Signed-off-by: Sumit Semwal

treewide: Fix typo in Documentation/DocBook/device-drivers

2014-11-03T16:53:34+00:00

This patch fix speeling typo found in html files within
Documentation/DocBook/device-drivers.
It is because html files are generated from comments in source,
so I have to fix comments in the source.

Signed-off-by: Masanari Iida 
Acked-by: Randy Dunlap 
Acked-by: Wolfram Sang 
Signed-off-by: Jonathan Corbet

dma-buf: don't open-code atomic_long_read()

2014-10-09T06:39:07+00:00

... not to mention that even atomic_long_read() is too low-level here -
there's file_count().

Signed-off-by: Al Viro

dma-buf/fence: Fix a kerneldoc warning

2014-08-28T06:29:09+00:00

kerneldoc doesn't know how to parse variables, so don't let it try.

Signed-off-by: Thierry Reding 
Signed-off-by: Sumit Semwal

reservation: add suppport for read-only access using rcu

2014-07-08T20:41:08+00:00

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

reservation: update api and add some helpers

2014-07-08T20:37:35+00:00

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

dma-buf: add poll support, v3

2014-07-08T20:36:52+00:00

Thanks to Fengguang Wu for spotting a missing static cast.

v2:
- Kill unused variable need_shared.
v3:
- Clarify the BUG() in dma_buf_release some more. (Rob Clark)

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