linux-kernel - [PATCH v2 0/3] dmaengine: ti: k3-udma: memcpy throughput improvement

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Date:   Wed, 13 Jan 2021 13:49:20 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...il.com>
To:     vkoul@...nel.org
Cc:     dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
        dmaengine@...r.kernel.org, vigneshr@...com,
        grygorii.strashko@...com, kishon@...com
Subject: [PATCH v2 0/3] dmaengine: ti: k3-udma: memcpy throughput improvement

Hi,

Changes since v1:
- Added Kishon's tested-by to the first two patch
- Moved the variable definitions to the start of their respective functions
- Remove braces where they are not needed
- correct indentation of cases
- additional patch to clean up the ret = 0 initializations in tisci channel configuration
  functions, no functional changes.

Newer members of the KS3 family (after AM654) have support for burst_size
configuration for each DMA channel.

The HW default value is 64 bytes but on higher throughput channels it can be
increased to 256 bytes (UCHANs) or 128 byes (HCHANs).

Aligning the buffers and length of the transfer to the burst size also increases
the throughput.

Numbers gathered on j721e (UCHAN pair):
echo 8000000 > /sys/module/dmatest/parameters/test_buf_size
echo 2000 > /sys/module/dmatest/parameters/timeout
echo 50 > /sys/module/dmatest/parameters/iterations
echo 1 > /sys/module/dmatest/parameters/max_channels

Prior to  this patch:   ~1.3 GB/s
After this patch:       ~1.8 GB/s
 with 1 byte alignment: ~1.7 GB/s

Regards,
Peter
---
Peter Ujfalusi (3):
  dmaengine: Extend the dmaengine_alignment for 128 and 256 bytes
  dmaengine: ti: k3-udma: Add support for burst_size configuration for
    mem2mem
  dmaengine: ti: k3-udma: Do not initialize ret in tisci channel config
    functions

 drivers/dma/ti/k3-udma.c  | 130 ++++++++++++++++++++++++++++++++++----
 include/linux/dmaengine.h |   2 +
 2 files changed, 120 insertions(+), 12 deletions(-)

-- 
2.30.0