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Add DW eDMA-specific helpers that validate an idle, already reserved channel and switch it to remote interrupt routing. The matching reclaim helper can quiesce the channel while it is still remote-routed, then restores the channel's default routing. The dmaengine channel reservation remains with the caller. Reclaim is best-effort because its callers cannot abort teardown. Report a quiesce failure locally, but always restore the default routing. Signed-off-by: Koichiro Den --- Changes in v7: - Leave dmaengine channel selection and lifetime management to the endpoint function, per discussion with Frank on v6 patch 4. drivers/dma/dw-edma/dw-edma-core.c | 39 ++++++++++++++++++++++++++++++ include/linux/dma/edma.h | 11 +++++++++ 2 files changed, 50 insertions(+) diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c index d214df55da3c..1582ecfc2965 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -1303,6 +1303,45 @@ int dw_edma_remove(struct dw_edma_chip *chip) } EXPORT_SYMBOL_GPL(dw_edma_remove); +int dw_edma_delegate_chan(struct dma_chan *dchan) +{ + struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan); + int ret = 0; + + if (!(chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL)) + return -EINVAL; + + guard(spinlock_irqsave)(&chan->vc.lock); + + if (chan->configured || chan->status != EDMA_ST_IDLE || + chan->request != EDMA_REQ_NONE) + ret = -EBUSY; + else + chan->irq_mode = DW_EDMA_CH_IRQ_REMOTE; + + return ret; +} +EXPORT_SYMBOL_GPL(dw_edma_delegate_chan); + +void dw_edma_reclaim_chan(struct dma_chan *dchan, bool quiesce) +{ + struct dw_edma_chan *chan; + + if (!dchan) + return; + + chan = dchan2dw_edma_chan(dchan); + if (quiesce && dw_edma_core_ch_quiesce(chan)) + dev_warn(chan->dw->chip->dev, + "failed to quiesce delegated %s channel %u\n", + chan->dir == EDMA_DIR_WRITE ? "write" : "read", + chan->id); + + scoped_guard(spinlock_irqsave, &chan->vc.lock) + chan->irq_mode = dw_edma_get_default_irq_mode(chan); +} +EXPORT_SYMBOL_GPL(dw_edma_reclaim_chan); + MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Synopsys DesignWare eDMA controller core driver"); MODULE_AUTHOR("Gustavo Pimentel "); diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h index 3c8e2ef9dee0..61ebb808981e 100644 --- a/include/linux/dma/edma.h +++ b/include/linux/dma/edma.h @@ -153,6 +153,8 @@ struct dw_edma_chip { #if IS_REACHABLE(CONFIG_DW_EDMA) int dw_edma_probe(struct dw_edma_chip *chip); int dw_edma_remove(struct dw_edma_chip *chip); +int dw_edma_delegate_chan(struct dma_chan *chan); +void dw_edma_reclaim_chan(struct dma_chan *chan, bool quiesce); #else static inline int dw_edma_probe(struct dw_edma_chip *chip) { @@ -163,6 +165,15 @@ static inline int dw_edma_remove(struct dw_edma_chip *chip) { return 0; } + +static inline int dw_edma_delegate_chan(struct dma_chan *chan) +{ + return -ENODEV; +} + +static inline void dw_edma_reclaim_chan(struct dma_chan *chan, bool quiesce) +{ +} #endif /* CONFIG_DW_EDMA */ #endif /* _DW_EDMA_H */ -- 2.51.0