[PATCH v7 0/8] Raid: enable talitos xor offload for improving performance

[<qiang.liu@freescale.com>]

Hi all,

The following 8 patches enabling fsl-dma and talitos offload raid
operations for improving raid performance and balancing CPU load.

These patches include talitos, fsl-dma and carma module (caram uses
some features of fsl-dma).

Write performance will be improved by 25-30% tested by iozone.
Write performance is improved about 2% after using spin_lock_bh replace
spin_lock_irqsave.
CPU load will be reduced by 8%.

"fwiw, I gave v5 a test-drive, setting up a RAID5 array on ramdisks
[1], and this patchseries, along with FSL_DMA && NET_DMA set seems
to be holding water, so this series gets my:"

Tested-by: Kim Phillips <kim.phillips@freescale.com>

[1] mdadm --create --verbose --force /dev/md0 --level=raid5 --raid-devices=4 \
	/dev/ram[0123]

Changes in v7:
	- add test result which is provided by Kim Phillips;
	- correct one coding style issue in patch 5/8;
	- add comments by Arnd Bergmann in patch 6/8;

Changes in v6:
	- swap the order of original patch 3/6 and 4/6;
	- merge Ira's patch to reduce the size of original patch;
	- merge Ira's patch of carma in 8/8;
	- update documents and descriptions according to Ira's advice;

Changes in v5:
	- add detail description in patch 3/6 about the process of completed
	descriptor, the process is in align with fsl-dma Reference Manual,
	illustrate the potential risk and how to reproduce it;
	- drop the patch 7/7 in v4 according to Timur's comments;

Changes in v4:
	- fix an error in talitos when dest addr is same with src addr, dest
	should be freed only one time if src is same with dest addr;
	- correct coding style in fsl-dma according to Ira's comments;
	- fix a race condition in fsl-dma fsl_tx_status(), remove the interface
	which is used to free descriptors in queue ld_completed, this interface
	has been included in fsldma_cleanup_descriptor(), in v3, there is one
	place missed spin_lock protect;
	- split the original patch 3/4 up to 2 patches 3/7 and 4/7 according to
	Li Yang's comments;
	- fix a warning of unitialized cookie;
	- add memory copy self test in fsl-dma;
	- add more detail description about use spin_lock_bh() to instead of
	spin_lock_irqsave() according to Timur's comments.

Changes in v3:
	- change release process of fsl-dma descriptor for resolve the
	potential race condition;
	- add test result when use spin_lock_bh replace spin_lock_irqsave;
	- modify the benchmark results according to the latest patch.

Changes in v2:
	- rebase onto cryptodev tree;
	- split the patch 3/4 up to 3 independent patches;
	- remove the patch 4/4, the fix is not for cryptodev tree;

Qiang Liu (8):
      Talitos: Support for async_tx XOR offload
      fsl-dma: remove attribute DMA_INTERRUPT of dmaengine
      fsl-dma: add fsl_dma_free_descriptor() to reduce code duplication
      fsl-dma: move functions to avoid forward declarations
      fsl-dma: change release process of dma descriptor for supporting async_tx
      fsl-dma: use spin_lock_bh to instead of spin_lock_irqsave
      fsl-dma: fix a warning of unitialized cookie
      carma: remove unnecessary DMA_INTERRUPT capability

 drivers/crypto/Kconfig                  |    9 +
 drivers/crypto/talitos.c                |  413 ++++++++++++++++++++++++++
 drivers/crypto/talitos.h                |   53 ++++
 drivers/dma/fsldma.c                    |  488 +++++++++++++++++--------------
 drivers/dma/fsldma.h                    |   17 +-
 drivers/misc/carma/carma-fpga-program.c |    1 -
 drivers/misc/carma/carma-fpga.c         |    2 +-
 7 files changed, 761 insertions(+), 222 deletions(-)