pmem: Add pmem driver

pmem: Add pmem driver

Signed-off-by: Rebecca Schultz <rschultz@google.com>
pmem: Use the thread group leader insted of the current thread.

Instead of keeping track of the current thread, use the thread group leader

Signed-off-by: Rebecca Schultz <rschultz@google.com>
pmem: Add some apis to reference and flush pmem files by file struct

The api to refer to pmem files by fd should be depricated, it can
cause problems if a processes fd table changes while the kernel is processing
data in a pmem file.  This change adds the safer api.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
pmem: Remove unused depricated fd api to pmem.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
pmem: Remove error message when calling get_pmem_addr

This call is used from the mdp driver to determine if the memory
is in pmem or in the fb.  We will encounter this case during normal operation
so this error message should be removed.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
pmem: Add include sched.h to fix compile errors

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
pmem: remove HW3D_* ioctls

Signed-off-by: Dima Zavin <dima@android.com>
pmem: Expose is_pmem_file to the in-kernel users.

Signed-off-by: Dima Zavin <dima@android.com>
pmem: Make the exposed functions be noops if CONFIG_ANDROID_PMEM is not set.

Signed-off-by: Dima Zavin <dima@android.com>
misc: pmem: don't flush if file was opened with O_SYNC

Change-Id: I067218658a0d7f7ecc1fe73e9ff6b0c3b3054653
Signed-off-by: Dima Zavin <dima@android.com>
pmem: Add cache flush ioctl for pmem buffers

Change-Id: I9156bad829e8c65087f122b48cc57638902fab12
Signed-off-by: Dima Zavin <dima@android.com>
Allow multiple pmem master mmap()s.

Signed-off-by: Jamie Gennis <jgennis@google.com>
Change-Id: Icbe619c92e0ebb391f0a93f81937705452a67d87

pmem: convert data_list_sem to a mutex

Also rename a function that now conflicts with a new
define in asm/pgtable.h

Change-Id: I4798048cb8dece1bc03604e7d0b03d86e0c0ef7f
Signed-off-by: Dima Zavin <dima@android.com>