linux-toradex.git/drivers/dma-buf/dma-buf.c, branch v4.4.74

dma-buf: Minor coding style fixes

2015-05-21T05:59:59+00:00

- WARNING: Missing a blank line after declarations
- WARNING: line over 80 characters
- WARNING: please, no space before tabs

Signed-off-by: Jagan Teki 
Cc: Sumit Semwal 
Signed-off-by: Sumit Semwal

dma-buf: add ref counting for module as exporter

2015-05-13T09:05:57+00:00

Add reference counting on a kernel module that exports dma-buf and
implements its operations. This prevents the module from being unloaded
while DMABUF file is in use.

The original patch [1] was submitted by Tomasz Stanislawski, but this
is a simpler way to do it.

v3: call module_put() as late as possible, per gregkh's comment.
v2: move owner to struct dma_buf, and use DEFINE_DMA_BUF_EXPORT_INFO
    macro to simplify the change.

Acked-by: Greg Kroah-Hartman 
Signed-off-by: Sumit Semwal 

[1]: https://lkml.org/lkml/2012/8/8/163

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

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

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

dma-buf: use reservation objects

2014-07-08T20:03:20+00:00

This allows reservation objects to be used in dma-buf. it's required
for implementing polling support on the fences that belong to a dma-buf.

Signed-off-by: Maarten Lankhorst 
Acked-by: Mauro Carvalho Chehab  #drivers/media/v4l2-core/
Acked-by: Thomas Hellstrom  #drivers/gpu/drm/ttm
Acked-by: Sumit Semwal 
Acked-by: Daniel Vetter 
Signed-off-by: Vincent Stehlé  #drivers/gpu/drm/armada/
Signed-off-by: Greg Kroah-Hartman

dma-buf: move to drivers/dma-buf

2014-07-08T17:51:06+00:00

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