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