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charset="utf-8" Remote eDMA users may want to prepare descriptors on the remote side while the local side only needs completion notifications. Provide a lightweight per-channel notification callback infrastructure. Signed-off-by: Koichiro Den --- drivers/dma/dw-edma/dw-edma-core.c | 41 ++++++++++++++++++++++++++++++ drivers/dma/dw-edma/dw-edma-core.h | 4 +++ include/linux/dma/edma.h | 29 +++++++++++++++++++++ 3 files changed, 74 insertions(+) diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-ed= ma-core.c index 910a4d516c3a..3396849d0606 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -616,6 +616,13 @@ static void dw_edma_done_interrupt(struct dw_edma_chan= *chan) struct virt_dma_desc *vd; unsigned long flags; =20 + if (chan->notify_only) { + if (chan->notify_cb) + chan->notify_cb(&chan->vc.chan, chan->notify_cb_param); + /* no cookie on this side, just return */ + return; + } + spin_lock_irqsave(&chan->vc.lock, flags); vd =3D vchan_next_desc(&chan->vc); if (vd) { @@ -834,6 +841,9 @@ static int dw_edma_channel_setup(struct dw_edma *dw, u3= 2 wr_alloc, u32 rd_alloc) chan->request =3D EDMA_REQ_NONE; chan->status =3D EDMA_ST_IDLE; chan->irq_mode =3D DW_EDMA_CH_IRQ_DEFAULT; + chan->notify_cb =3D NULL; + chan->notify_cb_param =3D NULL; + chan->notify_only =3D false; =20 spin_lock_init(&chan->poll_lock); INIT_DELAYED_WORK(&chan->poll_work, dw_edma_poll_work); @@ -1115,6 +1125,37 @@ int dw_edma_remove(struct dw_edma_chip *chip) } EXPORT_SYMBOL_GPL(dw_edma_remove); =20 +int dw_edma_chan_register_notify(struct dma_chan *dchan, + void (*cb)(struct dma_chan *chan, void *data), + void *data) +{ + struct dw_edma_chan *chan; + + if (!dchan || !dchan->device || + dchan->device->device_config !=3D dw_edma_device_config) + return -ENODEV; + + chan =3D dchan2dw_edma_chan(dchan); + + /* + * Reject the operation while the channel is active or has queued + * descriptors. + */ + scoped_guard(spinlock_irqsave, &chan->vc.lock) { + if (chan->request !=3D EDMA_REQ_NONE || + chan->status !=3D EDMA_ST_IDLE || + !list_empty(&chan->vc.desc_submitted) || + !list_empty(&chan->vc.desc_issued)) + return -EBUSY; + } + + chan->notify_cb =3D cb; + chan->notify_cb_param =3D data; + chan->notify_only =3D !!cb; + return 0; +} +EXPORT_SYMBOL_GPL(dw_edma_chan_register_notify); + MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Synopsys DesignWare eDMA controller core driver"); MODULE_AUTHOR("Gustavo Pimentel "); diff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-ed= ma-core.h index 560a2d2fea86..d5ee8330a6cb 100644 --- a/drivers/dma/dw-edma/dw-edma-core.h +++ b/drivers/dma/dw-edma/dw-edma-core.h @@ -84,6 +84,10 @@ struct dw_edma_chan { =20 enum dw_edma_ch_irq_mode irq_mode; =20 + void (*notify_cb)(struct dma_chan *chan, void *data); + void *notify_cb_param; + bool notify_only; + struct delayed_work poll_work; spinlock_t poll_lock; =20 diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h index d2938a88c02d..d616d22286d1 100644 --- a/include/linux/dma/edma.h +++ b/include/linux/dma/edma.h @@ -131,6 +131,27 @@ 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); + +/** + * dw_edma_chan_register_notify - register completion notification callback + * @chan: DMA channel obtained from dma_request_channel() + * @cb: callback invoked when a completion is detected on @chan (NULL to + * unregister) + * @data: opaque pointer passed back to @cb + * + * This is a lightweight notification mechanism intended for channels whose + * descriptors are managed externally (e.g. remote eDMA). When enabled, the + * local dw-edma instance does not perform cookie accounting for completio= ns, + * because the corresponding descriptor is not tracked locally. + * + * The callback may be invoked from atomic context and must not sleep. + * + * Return: 0 on success, -ENODEV if @chan is not a dw-edma channel, + * -EBUSY if the channel is active or has queued descriptors. + */ +int dw_edma_chan_register_notify(struct dma_chan *chan, + void (*cb)(struct dma_chan *chan, void *data), + void *data); #else static inline int dw_edma_probe(struct dw_edma_chip *chip) { @@ -141,6 +162,14 @@ static inline int dw_edma_remove(struct dw_edma_chip *= chip) { return 0; } + +static inline int dw_edma_chan_register_notify(struct dma_chan *chan, + void (*cb)(struct dma_chan *chan, + void *data), + void *data) +{ + return -ENODEV; +} #endif /* CONFIG_DW_EDMA */ =20 #endif /* _DW_EDMA_H */ --=20 2.51.0