gpu: ion: Modify zeroing code so it only allocates address space once

vmap/vunmap spend a significant amount of time allocating the
address space to map into.  Rather than allocating address space
for each page, instead allocate once for the entire allocation
and then just map and unmap each page into that address space.

Change-Id: I4a5c850717c80f75506a36b7ec2bcd55857b8dea
Signed-off-by: Rebecca Schultz Zavin <rschultz@google.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
gpu: ion: Refactor the code to zero buffers

Refactor the code in the system heap used to map and zero the buffers
into a seperate utility so it can be called from other heaps.  Use it from
the chunk heap.

Change-Id: I706341ae42b80bc4aae8a8614b4f73435bbf05d9
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
gpu: ion: Only flush buffers in the chunk heap if they were used cached

Change-Id: I4ffcf81a6be09e968310bbd882fb017415d61b48
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
gpu: ion: Add support for sharing buffers with dma buf kernel handles

Currently ion can only share buffers with dma buf fd's. Fd's can not be
used inside the kernel as they are process specific so support for
sharing buffers with dma buf kernel handles is needed to support kernel
only use cases. An example use case could be a GPU driver using ion
that wants to share its output buffers with a 3d party display
controller driver supporting dma buf.

Change-Id: If1b3753ddbd5b44c5a3e622055d5473e16fc1c48
Signed-off-by: Johan Mossberg <johan.mossberg@stericsson.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
gpu: ion: Make ion_free asynchronous

Add the ability for a heap to free buffers asynchrounously.  Freed buffers
are placed on a free list and freed from a low priority background thread.
If allocations from a particular heap fail, the free list is drained.  This
patch also enable asynchronous frees from the chunk heap.

Change-Id: Idfdbc8608b6cbd9e27d2e31ea4fd84fea9f69f7d
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
gpu: ion: fix kfree/list_del order

With CONFIG_SLUB_DEBUG_ON it would panic during
ion_alloc()
 ion_buffer_create()
   io_heap_drain_freelist()

Signed-off-by: JP Abgrall <jpa@google.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
gpu: ion: ion_chunk_heap: Zero chunk heap memory at creation time

Allocations from the ion heap need to be zeroed to protect userspace
from seeing memory belonging to other processes.  First allocations
from this heap were not zero'd allowing users to see memory from other
processes on a warm reset.

Change-Id: I524a7b79cb76c390c870fcf8b30d213185fc85a0
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
gpu: ion: Fix bug in ion shrinker

The high variable was sometimes used uninitialized

Change-Id: I2f51413fd2d063fdff325047e824dc8c749d9e0a
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
ARM: Allow SoCs to enable scatterlist chaining

Allow SoCs to enable the scatterlist chaining support, which allows
scatterlist tables to be broken up into smaller allocations.

As support for this feature depends on the implementation details of
the users of the scatterlists, we can't enable this globally without
auditing all the users, which is a very big task.  Instead, let SoCs
progressively switch over to using this.

SoC drivers using scatterlists and SoC DMA implementations need
auditing before this option can be enabled for the SoC.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
sw_sync: export sw_sync API

Needed to let modules link against sw_sync.

Change-Id: I71d3e52677ef21b6e1ecdb84f831491be1f4fbe6
Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
sw_sync: Fix error paths

Check the return value of get_unused_fd to make sure a valid
file descriptor is returned.

Make sure to call put_unused_fd even if an error occurs before
the fd can be used.

Change-Id: Ibbf55caebc2f8ee6a03f298eb0ae0189c7d10b5c
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
sw_sync: convert to new value_str debug ops

Change-Id: I9bad0cac1198043e04637641feb8112e2e7a9d11
Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>