[PATCH 0/1] dmaengine: virt-dma: convert tasklet to BH workqueue for callback invocation

[Alexander Kochetkov]

Hello!

I have Pine64 (Allwinner A64 ARMv8) board.

I've migrated from 5.4 kernel to 6.12 and noticed that DMA callback latencies
became very high. I noticed that sometimes callbacks get called from
ksoftirqd thread and in that case latencies are about 10 ms.
I found out that tasklet bacame deprecated and decided to rewrite DMA
callback code to use BH workqueue. In my case, that fixed high latencies.

My change affects a lot of drivers, but the change is trivial. I've verified
that affected drivers compile after change. But I cannot test it on all
platforms.


Alexander Kochetkov (1):
  dmaengine: virt-dma: convert tasklet to BH workqueue for callback
    invocation

 drivers/dma/amd/qdma/qdma.c                    |  1 +
 drivers/dma/arm-dma350.c                       |  1 +
 drivers/dma/bcm2835-dma.c                      |  2 +-
 drivers/dma/dma-axi-dmac.c                     |  8 ++++----
 drivers/dma/dma-jz4780.c                       |  2 +-
 drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c |  2 +-
 drivers/dma/dw-edma/dw-edma-core.c             |  2 +-
 drivers/dma/fsl-edma-common.c                  |  2 +-
 drivers/dma/fsl-edma-common.h                  |  1 +
 drivers/dma/fsl-qdma.c                         |  3 ++-
 drivers/dma/hisi_dma.c                         |  2 +-
 drivers/dma/hsu/hsu.c                          |  2 +-
 drivers/dma/idma64.c                           |  3 ++-
 drivers/dma/img-mdc-dma.c                      |  2 +-
 drivers/dma/imx-sdma.c                         |  2 +-
 drivers/dma/k3dma.c                            |  2 +-
 drivers/dma/loongson1-apb-dma.c                |  2 +-
 drivers/dma/mediatek/mtk-cqdma.c               |  2 +-
 drivers/dma/mediatek/mtk-hsdma.c               |  3 ++-
 drivers/dma/mediatek/mtk-uart-apdma.c          |  4 ++--
 drivers/dma/owl-dma.c                          |  2 +-
 drivers/dma/pxa_dma.c                          |  2 +-
 drivers/dma/qcom/bam_dma.c                     |  4 ++--
 drivers/dma/qcom/gpi.c                         |  1 +
 drivers/dma/qcom/qcom_adm.c                    |  2 +-
 drivers/dma/sa11x0-dma.c                       |  2 +-
 drivers/dma/sf-pdma/sf-pdma.c                  |  3 ++-
 drivers/dma/sprd-dma.c                         |  2 +-
 drivers/dma/st_fdma.c                          |  2 +-
 drivers/dma/stm32/stm32-dma.c                  |  1 +
 drivers/dma/stm32/stm32-dma3.c                 |  1 +
 drivers/dma/stm32/stm32-mdma.c                 |  1 +
 drivers/dma/sun6i-dma.c                        |  2 +-
 drivers/dma/tegra186-gpc-dma.c                 |  2 +-
 drivers/dma/tegra210-adma.c                    |  3 ++-
 drivers/dma/ti/edma.c                          |  2 +-
 drivers/dma/ti/k3-udma.c                       | 10 +++++-----
 drivers/dma/ti/omap-dma.c                      |  2 +-
 drivers/dma/uniphier-xdmac.c                   |  1 +
 drivers/dma/virt-dma.c                         |  6 +++---
 drivers/dma/virt-dma.h                         | 10 +++++-----
 41 files changed, 61 insertions(+), 48 deletions(-)

-- 
2.43.0