From: Alexander Kochetkov <al.kochet@gmail.com>
To: Vinod Koul <vkoul@kernel.org>,
dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: "Nishad Saraf" <nishads@amd.com>, "Lizhi Hou" <lizhi.hou@amd.com>,
"Jacky Huang" <ychuang3@nuvoton.com>,
"Shan-Chun Hung" <schung@nuvoton.com>,
"Florian Fainelli" <florian.fainelli@broadcom.com>,
"Ray Jui" <rjui@broadcom.com>,
"Scott Branden" <sbranden@broadcom.com>,
"Lars-Peter Clausen" <lars@metafoo.de>,
"Paul Cercueil" <paul@crapouillou.net>,
"Eugeniy Paltsev" <Eugeniy.Paltsev@synopsys.com>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Frank Li" <Frank.Li@nxp.com>,
"Zhou Wang" <wangzhou1@hisilicon.com>,
"Longfang Liu" <liulongfang@huawei.com>,
"Andy Shevchenko" <andy@kernel.org>,
"Shawn Guo" <shawnguo@kernel.org>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
"Fabio Estevam" <festevam@gmail.com>,
"Keguang Zhang" <keguang.zhang@gmail.com>,
"Sean Wang" <sean.wang@mediatek.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"AngeloGioacchino Del Regno"
<angelogioacchino.delregno@collabora.com>,
"Andreas Färber" <afaerber@suse.de>,
"Daniel Mack" <daniel@zonque.org>,
"Haojian Zhuang" <haojian.zhuang@gmail.com>,
"Robert Jarzmik" <robert.jarzmik@free.fr>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Samuel Holland" <samuel.holland@sifive.com>,
"Orson Zhai" <orsonzhai@gmail.com>,
"Baolin Wang" <baolin.wang@linux.alibaba.com>,
"Chunyan Zhang" <zhang.lyra@gmail.com>,
"Patrice Chotard" <patrice.chotard@foss.st.com>,
"Amélie Delaunay" <amelie.delaunay@foss.st.com>,
"Maxime Coquelin" <mcoquelin.stm32@gmail.com>,
"Alexandre Torgue" <alexandre.torgue@foss.st.com>,
"Chen-Yu Tsai" <wens@csie.org>,
"Jernej Skrabec" <jernej.skrabec@gmail.com>,
"Laxman Dewangan" <ldewangan@nvidia.com>,
"Jon Hunter" <jonathanh@nvidia.com>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Peter Ujfalusi" <peter.ujfalusi@gmail.com>,
"Kunihiko Hayashi" <hayashi.kunihiko@socionext.com>,
"Masami Hiramatsu" <mhiramat@kernel.org>,
"Dave Jiang" <dave.jiang@intel.com>,
"Amit Vadhavana" <av2082000@gmail.com>,
"Uwe Kleine-König" <u.kleine-koenig@baylibre.com>,
"Ulf Hansson" <ulf.hansson@linaro.org>,
"Md Sadre Alam" <quic_mdalam@quicinc.com>,
"Alexander Kochetkov" <al.kochet@gmail.com>,
"Casey Connolly" <casey.connolly@linaro.org>,
"Kees Cook" <kees@kernel.org>,
"Fenghua Yu" <fenghua.yu@intel.com>,
"Jyothi Kumar Seerapu" <quic_jseerapu@quicinc.com>
Subject: [PATCH 0/1] dmaengine: virt-dma: convert tasklet to BH workqueue for callback invocation
Date: Fri, 13 Jun 2025 14:34:43 +0000 [thread overview]
Message-ID: <20250613143605.5748-1-al.kochet@gmail.com> (raw)
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
next reply other threads:[~2025-06-13 14:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-13 14:34 Alexander Kochetkov [this message]
2025-06-13 14:34 ` [PATCH 1/1] dmaengine: virt-dma: convert tasklet to BH workqueue for callback invocation Alexander Kochetkov
2025-06-13 16:33 ` Andy Shevchenko
2025-06-13 18:51 ` Alexander Kochetkov
2025-06-13 20:58 ` Andy Shevchenko
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