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[PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg

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Hi,

The following series with the final patch will add support for sDMA Linked List
transfer support.
Linked List is supported by sDMA in OMAP3630+ (OMAP4/5, dra7 family).
If the descriptor load feature is present we can create the descriptors for each
SG beforehand and let sDMA to walk them through.
This way the number of sDMA interrupts the kernel need to handle will drop
dramatically.

I have gathered some numbers to show the difference.

Booting up the board with filesystem on SD card for example:
# cat /proc/interrupts | grep dma
W/o LinkedList support:
 27:       4436          0     WUGEN  13 Level     omap-dma-engine

Same board/filesystem with this patch:
 27:       1027          0     WUGEN  13 Level     omap-dma-engine

Or copying files from SD card to eMCC:
# du -h /usr
2.1G    /usr/
# find /usr/ -type f | wc -l
232001

# cp -r /usr/* /mnt/emmc/tmp/

W/o LinkedList we see ~761069 DMA interrupts.
With LinkedList support it is down to ~269314 DMA interrupts.

With the decreased DMA interrupt number the CPU load is dropping
significantly as well.

The series depends on the interleaved transfer support patch I have sent couple
of days ago:
https://lkml.org/lkml/2016/7/12/216

Regards,
Peter
---
Peter Ujfalusi (7):
  dmaengine: omap-dma: Simplify omap_dma_start_sg parameter list
  dmaengine: omap-dma: Complete the cookie first on transfer completion
  dmaengine: omap-dma: Simplify omap_dma_callback
  dmaengine: omap-dma: Dynamically allocate memory for lch_map
  dmaengine: omap-dma: Add more debug information when freeing channel
  dmaengine: omap-dma: Use pointer to omap_sg in slave_sg setup's loop
  dmaengine: omap-dma: Support for LinkedList transfer of slave_sg

 drivers/dma/omap-dma.c | 234 +++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 207 insertions(+), 27 deletions(-)

--
2.9.1

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[PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  [PATCH 1/7] dmaengine: omap-dma: Simplify omap_dma_start_sg parameter list Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  [PATCH 7/7] dmaengine: omap-dma: Support for LinkedList transfer of slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
    Re: [PATCH 7/7] dmaengine: omap-dma: Support for LinkedList transfer  of slave_sg Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 12:50 +0200
      Re: [PATCH 7/7] dmaengine: omap-dma: Support for LinkedList transfer  of slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-18 13:20 +0200
  [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
    Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 12:40 +0200
      Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-19 14:40 +0200
        Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-19 18:30 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-19 21:30 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Vinod Koul <vinod.koul@intel.com> - 2016-07-24 09:40 +0200
        Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on transfer completion Robert Jarzmik <robert.jarzmik@free.fr> - 2016-07-20 08:30 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-21 11:40 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-21 11:40 +0200
            Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-21 11:50 +0200
              Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-22 13:10 +0200
  [PATCH 4/7] dmaengine: omap-dma: Dynamically allocate memory for lch_map Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  [PATCH 6/7] dmaengine: omap-dma: Use pointer to omap_sg in slave_sg setup's loop Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 12:40 +0200
    Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-18 14:10 +0200
      Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 14:30 +0200
        Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-18 14:40 +0200

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