Re: [PATCH v2 09/19] dmaengine: dw-edma: Reclaim issued descriptors from IRQ-paired LL progress

On Fri, Jul 24, 2026 at 02:17:28PM +0900, Koichiro Den wrote:
> On Thu, Jul 23, 2026 at 03:56:10PM -0500, Frank Li wrote:
> > On Thu, Jul 23, 2026 at 05:41:40PM +0900, Koichiro Den wrote:
> > > Dynamic append can put entries from several descriptors in the ring.
> > > Track the consumed boundary in ll_done, reuse consumed entries, and
> > > complete descriptors in issued order. Keep one data entry free so a
> > > physical index is unambiguous within the active producer window.
> > >
> > > Sample DMA_LLP in the hard IRQ under vc.lock after clearing status, then
> > > normalize it to the exclusive boundary used by ll_done. A deferred read
> > > could attach progress to the wrong interrupt.
> > >
> > > A stopped sample points to the next entry. Keep a running sample one
> > > entry behind because legacy eDMA fetch can advance DMA_LLP before payload
> > > completion. The following HDMA watermark patch uses the same conservative
> > > boundary. Handle EDMA_REQ_STOP and EDMA_REQ_PAUSE even if progress empties
> > > the issued list.
> > >
> > > Suggested-by: Frank Li <[email protected]>
> > > Signed-off-by: Koichiro Den <[email protected]>
> > > ---
> > > Changes in v2:
> > >   - Replace ll_end completion accounting with ll_done progress tracking.
> > >   - Sample and normalize DMA_LLP in the hard IRQ; v1 read it from deferred
> > >     consumers.
> > >   - Use the raw next-entry boundary for stopped samples and keep running
> > >     samples one entry behind it.
> > >   - Handle STOP and PAUSE after progress empties the issued list.
> > >
> > > Frank, dw_edma_ll_clean_pending() is based on the idea in your RFT,
> > > although the implementation has changed substantially. Please let me
> > > know if you would prefer different attribution other than Suggested-by.
> > >
> > >  drivers/dma/dw-edma/dw-edma-core.c    | 248 ++++++++++++++++++++++----
> > >  drivers/dma/dw-edma/dw-edma-core.h    |  32 ++--
> > >  drivers/dma/dw-edma/dw-edma-v0-core.c |  10 +-
> > >  drivers/dma/dw-edma/dw-hdma-v0-core.c |   4 +-
> > >  4 files changed, 250 insertions(+), 44 deletions(-)
> > >
> > > diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
> > > index e88bfb417ad4..44a0ff906f2f 100644
> > > --- a/drivers/dma/dw-edma/dw-edma-core.c
> > > +++ b/drivers/dma/dw-edma/dw-edma-core.c
> > > @@ -51,13 +51,6 @@ dw_edma_alloc_desc(struct dw_edma_chan *chan, size_t nburst)
> > >  {
> > >  	struct dw_edma_desc *desc;
> > >
> > > -	/*
> > > -	 * For now, a descriptor that does not fit would stall the channel
> > > -	 * forever: reject it up front.
> > > -	 */
> > > -	if (!chan->non_ll && nburst > chan->ll_max - 1)
> > > -		return NULL;
> > > -
> > >  	desc = kzalloc_flex(*desc, burst, nburst, GFP_NOWAIT);
> > >  	if (unlikely(!desc))
> > >  		return NULL;
> > > @@ -73,6 +66,12 @@ static void vchan_free_desc(struct virt_dma_desc *vdesc)
> > >  	kfree(vd2dw_edma_desc(vdesc));
> > >  }
> > >
> > > +static void dw_edma_ll_irq_idx_discard(struct dw_edma_chan *chan)
> > > +{
> > > +	chan->ll_irq_idx = -1;
> > > +	chan->ll_irq_stopped = false;
> > > +}
> > > +
> > >  static void dw_hdma_set_callback_result(struct virt_dma_desc *vd,
> > >  					enum dmaengine_tx_result result)
> > >  {
> > > @@ -103,7 +102,8 @@ static void dw_edma_core_reset_ll(struct dw_edma_chan *chan)
> > >  	u32 i;
> > >
> > >  	chan->ll_head = 0;
> > > -	chan->ll_end = 0;
> > > +	chan->ll_done = 0;
> > > +	dw_edma_ll_irq_idx_discard(chan);
> > >  	/* Drop stale CB bits before reusing the circular LL ring. */
> > >  	for (i = 0; i < chan->ll_max; i++)
> > >  		dw_edma_core_ll_clear(chan, i);
> > > @@ -116,11 +116,26 @@ static void dw_edma_core_reset_ll(struct dw_edma_chan *chan)
> > >  	chan->ll_valid = true;
> > >  }
> > >
> > > +static u32 dw_edma_core_get_ll_dist(struct dw_edma_chan *chan, u32 from, u32 to)
> > > +{
> > > +	return (to + chan->ll_max - from) % chan->ll_max;
> > > +}
> > > +
> > > +static u32 dw_edma_core_get_used_num(struct dw_edma_chan *chan)
> > > +{
> > > +	return dw_edma_core_get_ll_dist(chan, chan->ll_done, chan->ll_head);
> > > +}
> > > +
> > >  static u32 dw_edma_core_get_free_num(struct dw_edma_chan *chan)
> > >  {
> > > -	/* Keep one data entry free so equal indices mean an empty ring. */
> > > -	return (chan->ll_end + chan->ll_max - 1 - chan->ll_head) %
> > > -		chan->ll_max;
> > > +	/*
> > > +	 * Measure occupancy from ll_done: entries consumed by the
> > > +	 * hardware can be reused even if the descriptor that owns them has not
> > > +	 * completed yet; this lets descriptors larger than the ring move forward.
> > > +	 *
> >
> > not sure what means of this comments
>
> What I meant is that ring-slot reclamation is no longer tied to completion of
> the descriptor. ll_done advances per consumed entry, so a descriptor that only
> partly fits in the current free window can continue as those entries are
> recycled.
>
> The comment is not very clear, though. Would this be better?

yes

>
>   /*
>    * ll_done is the consumer boundary, so only the distance from ll_done
>    * to ll_head is occupied. Descriptor completion is tracked separately
>    * with done_burst.
>    *
>    * Keep one data entry free so equal indices mean an empty ring.
>    */
>
> >
> > > +	 * Keep one data entry free so equal indices mean an empty ring.
> > > +	 */
> > > +	return chan->ll_max - 1 - dw_edma_core_get_used_num(chan);
> > >  }
> > >
> > >  static bool dw_edma_core_enable_ll_irq(struct dw_edma_desc *desc, u32 i,
> > > @@ -129,9 +144,51 @@ static bool dw_edma_core_enable_ll_irq(struct dw_edma_desc *desc, u32 i,
> > >  	return desc->chan->dw->core->ll_irq(desc, i, free);
> > >  }
> > >
> > > +static bool dw_edma_ll_advance(struct dw_edma_chan *chan, int idx, u32 *old_done)
> > > +{
> > > +	u32 done;
> > > +
> > > +	if (idx < 0 || (u32)idx >= chan->ll_max)
> > > +		return false;
> > > +
> > > +	done = dw_edma_core_get_ll_dist(chan, chan->ll_done, idx);
> > > +	if (!done || done > dw_edma_core_get_used_num(chan))
> > > +		return false;
> > > +
> > > +	*old_done = chan->ll_done;
> > > +	chan->ll_done = idx;
> > > +
> > > +	return true;
> > > +}
> > > +
> > >  static bool dw_edma_ll_pending(struct dw_edma_chan *chan)
> > >  {
> > > -	return chan->ll_head != chan->ll_end;
> > > +	return dw_edma_core_get_used_num(chan);
> > > +}
> > > +
> > > +static u32 dw_edma_core_ch_transfer_size(struct dw_edma_chan *chan)
> > > +{
> > > +	if (!chan->dw->core->ch_transfer_size)
> > > +		return U32_MAX;
> > > +
> > > +	return chan->dw->core->ch_transfer_size(chan);
> > > +}
> > > +
> > > +static bool dw_edma_ll_irq_is_stopped(struct dw_edma_chan *chan, bool stopped)
> > > +{
> > > +	if (stopped)
> > > +		return true;
> >
> > look like strange, you pass stopped add check here.
>
> Hm, right, 'stopped' looks like overloaded here. The passed true means that the
> provider observed an explicit STOP event, while false means either a progress
> event or an ambiguous eDMA DONE event.
>
> I'll try to make the event semantics explicit in v3. rather than pass this as a
> boolean.
>
> >
> > > +
> > > +	/*
> > > +	 * Native HDMA reports STOP separately. The legacy interrupt interface
> > > +	 * uses DONE for both progress and stop, so confirm a stopped boundary
> > > +	 * with channel status and transfer size.
> > > +	 */
> > > +	if (!chan->dw->core->ch_transfer_size)
> > > +		return false;
> > > +
> > > +	return dw_edma_core_ch_status(chan) == DMA_COMPLETE &&
> > > +	       dw_edma_core_ch_transfer_size(chan) == 0;
> > >  }
> > >
> > >  static void dw_edma_core_ll_start(struct dw_edma_desc *desc)
> > > @@ -166,7 +223,6 @@ static void dw_edma_core_ll_start(struct dw_edma_desc *desc)
> > >  		}
> > >  	}
> > >
> > > -	desc->done_burst = desc->start_burst;
> > >  	desc->start_burst = i;
> > >  }
> > >
> > > @@ -235,6 +291,110 @@ static void dw_edma_terminate_all_descs(struct dw_edma_chan *chan)
> > >  	dw_edma_terminate_vdesc_list(&chan->vc.desc_submitted);
> > >  }
> > >
> > > +/* Must be called with vc.lock held. */
> > > +static void dw_edma_ll_clean_pending(struct dw_edma_chan *chan, u32 old_done)
> > > +{
> > > +	struct virt_dma_desc *vd, *_vd;
> > > +	u32 done = dw_edma_core_get_ll_dist(chan, old_done, chan->ll_done);
> > > +
> > > +	list_for_each_entry_safe(vd, _vd, &chan->vc.desc_issued, node) {
> > > +		struct dw_edma_desc *desc = vd2dw_edma_desc(vd);
> > > +		u32 consumed, started;
> > > +
> > > +		if (!done)
> > > +			break;
> >
> > this check should before dw_edma_ll_irq_idx_discard();
>
> The !done check here only ends the distribution loop after all entries from an
> accepted sample have been accounted for. dw_edma_ll_advance() already rejects a
> zero-distance or stale sample.
>
> The sample is discarded earlier so an invalid sample is not retries. I'll make
> that ordering clearer.
>
> >
> > > +
> > > +		/*
> > > +		 * start_burst is the append boundary. done_burst is the
> > > +		 * hardware-consumed boundary reported through LL progress.
> > > +		 */
> >
> > start_burst indicate the start index which will append into hardware LL
> > when there are free slots.
> > done_burst indicate how much already progressed by hardware DMA.
> >
> >
> > This required the strict desc enqueue and dequeue sequence.
>
> Right. This part depends on descriptors being published and retired in strict
> list order. I'll state that invariant explicitly. (Correct me if I misinterpret
> your point.)

I suggest recorder some addition "sync" informaiton, in case some order
mass up, so we can easily to detect miss sync problem and resync to next
correct list.

Frank

>
> >
> >
> > > +		started = desc->start_burst - desc->done_burst;
> > > +		if (!started)
> > > +			break;
> > > +
> > > +		consumed = min(done, started);
> > > +		desc->done_burst += consumed;
> > > +		done -= consumed;
> > > +
> > > +		/*
> > > +		 * Descriptors are appended in list order, so later descriptors
> > > +		 * cannot be complete if this one has not been fully consumed.
> > > +		 */
> > > +		if (desc->done_burst != desc->nburst)
> > > +			break;
> > > +
> > > +		/* Hardware has consumed this descriptor's LL entries. */
> > > +		dw_hdma_set_callback_result(vd, DMA_TRANS_NOERROR);
> > > +		list_del(&vd->node);
> > > +		vchan_cookie_complete(vd);
> > > +	}
> > > +}
> > > +
> > > +/* Must be called with vc.lock held. */
> > > +static int dw_edma_ll_recycle_idx(struct dw_edma_chan *chan, int idx,
> > > +				  bool stopped)
> > > +{
> > > +	if (idx < 0 || (u32)idx > chan->ll_max)
> > > +		return -EINVAL;
> > > +
> > > +	/*
> > > +	 * Convert the raw LLP index to the exclusive boundary used by ll_done.
> > > +	 * For both eDMA and HDMA, once the engine has stopped, LLP points to
> > > +	 * the next element. ll_max is the link element, hence the following
> > > +	 * data boundary is 0.
> > > +	 */
> > start_burst> +	if (stopped)
> > > +		return idx == chan->ll_max ? 0 : idx;
> > > +
> > > +	/*
> > > +	 * Moving a running index one entry back cannot represent index 0
> > > +	 * without wrapping it to ll_max - 1. That could falsely consume a full
> > > +	 * producer window, so wait for another sample or STOP.
> > > +	 */
> > > +	if (!idx)
> > > +		return -EINVAL;
> > > +
> > > +	/*
> > > +	 * A running eDMA LLP can move ahead of payload completion, so keep the
> > > +	 * boundary one entry behind it.
> > > +	 *
> > > +	 * DWC PCIe Controller Databook 6.10a-lca06, Section 7.2.1, Table 7-3
> > > +	 * describes an HDMA watermark LLP as an inclusive LLE recycling
> > > +	 * boundary, which would normally translate to idx + 1. During testing
> > > +	 * on a DWC HDMA 6.30a integration, using that boundary for DMAengine
> > > +	 * completion let clients release DMA mappings while hardware still
> > > +	 * accessed them, causing IOMMU faults. Keep the boundary one entry
> > > +	 * behind the raw LLP for HDMA as well. Stopped samples continue to use
> > > +	 * the next-entry boundary above.
> > > +	 */
> > > +	return idx == chan->ll_max ? chan->ll_max - 1 : idx - 1;
> > > +}
> > > +
> > > +/*
> > > + * Must be called with vc.lock held. Consume a recorded LL progress
> > > + * boundary, if any. Advance ll_done and complete descriptors covered by
> > > + * the newly consumed range. Return true if ll_done advanced.
> > > + */
> > > +static bool dw_edma_ll_consume_progress(struct dw_edma_chan *chan)
> > > +{
> > > +	int idx = chan->ll_irq_idx;
> > > +	u32 old_done;
> > > +
> > > +	/* No progress sample is pending. */
> > > +	if (idx < 0)
> > > +		return false;
> > > +
> > > +	dw_edma_ll_irq_idx_discard(chan);
> > > +
> > > +	/* Ignore duplicate or stale progress. */
> > > +	if (!dw_edma_ll_advance(chan, idx, &old_done))
> > > +		return false;
> > > +
> > > +	dw_edma_ll_clean_pending(chan, old_done);
> >
> > is it better dw_edma_ll_clean_pending(chan, from_idx, to_idx);
> >
> > Or you actually only use how many done, not related current actual
> > posistion
> >
> > u32 done = dw_edma_core_get_ll_dist(chan, old_done, chan->ll_done)
> >
> > 	dw_edma_ll_clean_pending(chan, done_cnt);
> >
> >
> > If one any small error happen, whole follow may mass up. I suggested double
> > check from_idx\to_idx, which match desc's recorder.
> >
> >
> > header of pending queue
> >
> > 	desc:
> > 		start_burst 10
> > 		done_burst 0
> > 		ll_header 35
> > 		ll_end	45
> >
> > when clean up desc, make sure from_idx and to_idx include range 35-45.
> >
> >
> > if 100% depend on the counter,  assume a bugs or somethring wrong
> >
> > hardware pointer 33, the go though 43,  here total is 10, so whole desc
> > mark done, but actually hardware only finish 43.
> >
> > if everything work perfect, no such problem. But it'd better to double
> > check it, at least, report an error when this happen.
>
> I see your concern now. The count-only check cannot detect such case if
> something goes wrong. I'll update the part in v3 so that it keeps enough
> boundary information to validate this, or add an equivalent consistency check.
>
> Thanks for the detailed review,
> Koichiro
>
> >
> > Frank
> >
> > > +
> > > +	return true;
> > > +}
> > > +
> > >  /* Must be called with vc.lock held. */
> > >  static void dw_edma_core_ch_maybe_doorbell(struct dw_edma_chan *chan)
> > >  {
> > > @@ -424,6 +584,8 @@ static void dw_edma_device_issue_pending(struct dma_chan *dchan)
> > >  	if (chan->configured && vchan_issue_pending(&chan->vc) &&
> > >  	    chan->request == EDMA_REQ_NONE &&
> > >  	    chan->status == EDMA_ST_IDLE) {
> > > +		if (!chan->non_ll && !dw_edma_ll_pending(chan))
> > > +			dw_edma_ll_irq_idx_discard(chan);
> > >  		chan->status = EDMA_ST_BUSY;
> > >  		dw_edma_start_transfer(chan);
> > >  		dw_edma_core_ch_maybe_doorbell(chan);
> > > @@ -697,6 +859,7 @@ static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
> > >  	struct dw_edma_desc *desc;
> > >  	struct virt_dma_desc *vd;
> > >  	unsigned long flags;
> > > +	bool active;
> > >
> > >  	spin_lock_irqsave(&chan->vc.lock, flags);
> > >  	if (chan->status == EDMA_ST_PAUSE) {
> > > @@ -704,20 +867,21 @@ static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
> > >  		return;
> > >  	}
> > >
> > > +	if (!chan->non_ll)
> > > +		dw_edma_ll_consume_progress(chan);
> > > +
> > >  	switch (chan->request) {
> > >  	case EDMA_REQ_NONE:
> > >  	case EDMA_REQ_PAUSE:
> > >  		vd = vchan_next_desc(&chan->vc);
> > > -		if (!vd)
> > > -			break;
> > > -
> > > -		desc = vd2dw_edma_desc(vd);
> > > -		if (desc->start_burst >= desc->nburst) {
> > > -			dw_hdma_set_callback_result(vd, DMA_TRANS_NOERROR);
> > > -			list_del(&vd->node);
> > > -			vchan_cookie_complete(vd);
> > > -			if (!chan->non_ll)
> > > -				chan->ll_end = chan->ll_head;
> > > +		if (vd && chan->non_ll) {
> > > +			desc = vd2dw_edma_desc(vd);
> > > +			if (desc->start_burst >= desc->nburst) {
> > > +				dw_hdma_set_callback_result(vd,
> > > +							    DMA_TRANS_NOERROR);
> > > +				list_del(&vd->node);
> > > +				vchan_cookie_complete(vd);
> > > +			}
> > >  		}
> > >
> > >  		if (chan->request == EDMA_REQ_PAUSE) {
> > > @@ -726,14 +890,15 @@ static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
> > >  			break;
> > >  		}
> > >
> > > -		chan->status = dw_edma_start_transfer(chan) ? EDMA_ST_BUSY : EDMA_ST_IDLE;
> > > +		active = false;
> > > +		if (vd)
> > > +			active = dw_edma_start_transfer(chan);
> > > +		if (!chan->non_ll)
> > > +			active = dw_edma_ll_pending(chan);
> > > +		chan->status = active ? EDMA_ST_BUSY : EDMA_ST_IDLE;
> > >  		break;
> > >
> > >  	case EDMA_REQ_STOP:
> > > -		vd = vchan_next_desc(&chan->vc);
> > > -		if (!vd)
> > > -			break;
> > > -
> > >  		dw_edma_terminate_all_descs(chan);
> > >  		chan->request = EDMA_REQ_NONE;
> > >  		chan->status = EDMA_ST_IDLE;
> > > @@ -789,12 +954,34 @@ static void dw_edma_queue_irq_work(struct dw_edma_chan *chan,
> > >  	queue_work(chan->dw->wq, &chan->irq_work);
> > >  }
> > >
> > > -static void dw_edma_done_interrupt_deferred(struct dw_edma_chan *chan)
> > > +static void dw_edma_record_irq_idx(struct dw_edma_chan *chan, bool stopped)
> > > +{
> > > +	int idx;
> > > +
> > > +	guard(spinlock_irqsave)(&chan->vc.lock);
> > > +
> > > +	if (!chan->non_ll) {
> > > +		idx = dw_edma_core_ll_cur_idx(chan);
> > > +		if (idx >= 0) {
> > > +			stopped = dw_edma_ll_irq_is_stopped(chan, stopped);
> > > +			idx = dw_edma_ll_recycle_idx(chan, idx, stopped);
> > > +			if (idx >= 0) {
> > > +				chan->ll_irq_idx = idx;
> > > +				chan->ll_irq_stopped = stopped;
> > > +			}
> > > +		}
> > > +	}
> > > +}
> > > +
> > > +static void dw_edma_done_interrupt_deferred(struct dw_edma_chan *chan,
> > > +					    bool stopped)
> > >  {
> > > +	dw_edma_record_irq_idx(chan, stopped);
> > >  	dw_edma_queue_irq_work(chan, DW_EDMA_IRQ_DONE);
> > >  }
> > >
> > > -static void dw_edma_abort_interrupt_deferred(struct dw_edma_chan *chan)
> > > +static void dw_edma_abort_interrupt_deferred(struct dw_edma_chan *chan,
> > > +					     bool stopped)
> > >  {
> > >  	dw_edma_queue_irq_work(chan, DW_EDMA_IRQ_ABORT);
> > >  }
> > > @@ -1033,6 +1220,7 @@ static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
> > >  		chan->request = EDMA_REQ_NONE;
> > >  		chan->status = EDMA_ST_IDLE;
> > >  		chan->irq_mode = dw_edma_get_default_irq_mode(chan);
> > > +		dw_edma_ll_irq_idx_discard(chan);
> > >  		INIT_WORK(&chan->irq_work, dw_edma_irq_work);
> > >  		atomic_set(&chan->irq_pending, 0);
> > >
> > > diff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-edma-core.h
> > > index 8ed37e8a12cb..90dcbe415f57 100644
> > > --- a/drivers/dma/dw-edma/dw-edma-core.h
> > > +++ b/drivers/dma/dw-edma/dw-edma-core.h
> > > @@ -72,24 +72,35 @@ struct dw_edma_chan {
> > >  	u8				func_no;
> > >
> > >  	/*
> > > -	 * New LL entries are appended at ll_head. Entries between ll_end
> > > -	 * and ll_head, modulo the LL ring, are owned by DMA; the rest are
> > > -	 * owned by software.
> > > +	 * New LL entries are appended at ll_head. Entries between ll_done and
> > > +	 * ll_head, modulo the LL ring, are owned by DMA; the rest are available
> > > +	 * to software.
> > >  	 *
> > >  	 *   software-owned      DMA-owned       software-owned
> > >  	 * +---------------+-------------------+---------------+
> > >  	 * ^               ^                   ^
> > > -	 * 0             ll_end              ll_head
> > > +	 * 0            ll_done             ll_head
> > >  	 *
> > > -	 * The link entry points back to the region start. ll_head == ll_end
> > > -	 * means all entries are software-owned and previous DMA work is
> > > -	 * done.
> > > +	 * The link entry points back to the region start. No DMA-owned entries
> > > +	 * remain once ll_done catches up with ll_head.
> > >  	 *
> > >  	 * Software always keeps at least one free entry, so the ring is
> > > -	 * never completely DMA-owned.
> > > +	 * never completely DMA-owned. That keeps a hardware-reported physical
> > > +	 * LL index unique within the current ll_done..ll_head producer window.
> > >  	 */
> > >  	u32				ll_head;
> > > -	u32				ll_end;
> > > +	u32				ll_done;
> > > +
> > > +	/*
> > > +	 * LL progress boundary sampled by the hard IRQ handler after clearing
> > > +	 * the DONE/watermark status it accompanies. It is normalized to the
> > > +	 * exclusive convention used by ll_done. The sample and all later
> > > +	 * accesses are serialized by vc.lock; -1 means consumed or invalid.
> > > +	 * ll_irq_stopped records whether the same event found the channel
> > > +	 * stopped.
> > > +	 */
> > > +	int				ll_irq_idx;
> > > +	bool				ll_irq_stopped;
> > >
> > >  	u32				ll_max;		/* Data entries */
> > >  	struct dw_edma_region		ll_region;	/* Linked list */
> > > @@ -146,7 +157,7 @@ struct dw_edma {
> > >  	const struct dw_edma_core_ops	*core;
> > >  };
> > >
> > > -typedef void (*dw_edma_handler_t)(struct dw_edma_chan *);
> > > +typedef void (*dw_edma_handler_t)(struct dw_edma_chan *, bool);
> > >
> > >  struct dw_edma_core_ops {
> > >  	void (*off)(struct dw_edma *dw);
> > > @@ -154,6 +165,7 @@ struct dw_edma_core_ops {
> > >  	int (*ch_quiesce)(struct dw_edma_chan *chan);
> > >  	u16 (*ch_count)(struct dw_edma *dw, enum dw_edma_dir dir);
> > >  	enum dma_status (*ch_status)(struct dw_edma_chan *chan);
> > > +	u32 (*ch_transfer_size)(struct dw_edma_chan *chan);
> > >  	irqreturn_t (*handle_int)(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
> > >  				  dw_edma_handler_t done, dw_edma_handler_t abort);
> > >  	void (*non_ll_start)(struct dw_edma_chan *chan, struct dw_edma_burst *child);
> > > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c
> > > index 62141aa32e50..3b69fa26bf1c 100644
> > > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c
> > > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c
> > > @@ -318,6 +318,11 @@ static enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
> > >  		return DMA_ERROR;
> > >  }
> > >
> > > +static u32 dw_edma_v0_core_ch_transfer_size(struct dw_edma_chan *chan)
> > > +{
> > > +	return GET_CH_32(chan->dw, chan->dir, chan->id, transfer_size);
> > > +}
> > > +
> > >  static void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
> > >  {
> > >  	struct dw_edma *dw = chan->dw;
> > > @@ -375,7 +380,7 @@ dw_edma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
> > >  			continue;
> > >
> > >  		dw_edma_v0_core_clear_done_int(chan);
> > > -		done(chan);
> > > +		done(chan, false);
> > >
> > >  		ret = IRQ_HANDLED;
> > >  	}
> > > @@ -389,7 +394,7 @@ dw_edma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
> > >  			continue;
> > >
> > >  		dw_edma_v0_core_clear_abort_int(chan);
> > > -		abort(chan);
> > > +		abort(chan, false);
> > >
> > >  		ret = IRQ_HANDLED;
> > >  	}
> > > @@ -689,6 +694,7 @@ static const struct dw_edma_core_ops dw_edma_v0_core = {
> > >  	.ch_quiesce = dw_edma_v0_core_ch_quiesce,
> > >  	.ch_count = dw_edma_v0_core_ch_count,
> > >  	.ch_status = dw_edma_v0_core_ch_status,
> > > +	.ch_transfer_size = dw_edma_v0_core_ch_transfer_size,
> > >  	.handle_int = dw_edma_v0_core_handle_int,
> > >  	.ll_data = dw_edma_v0_core_ll_data,
> > >  	.ll_link = dw_edma_v0_core_ll_link,
> > > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> > > index fb651a83f0f3..4440e3ebaeac 100644
> > > --- a/drivers/dma/dw-edma/dw-hdma-v0-core.c
> > > +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> > > @@ -203,14 +203,14 @@ dw_hdma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
> > >  		val = dw_hdma_v0_core_status_int(chan);
> > >  		if (FIELD_GET(HDMA_V0_STOP_INT_MASK, val)) {
> > >  			dw_hdma_v0_core_clear_done_int(chan);
> > > -			done(chan);
> > > +			done(chan, true);
> > >
> > >  			ret = IRQ_HANDLED;
> > >  		}
> > >
> > >  		if (FIELD_GET(HDMA_V0_ABORT_INT_MASK, val)) {
> > >  			dw_hdma_v0_core_clear_abort_int(chan);
> > > -			abort(chan);
> > > +			abort(chan, false);
> > >
> > >  			ret = IRQ_HANDLED;
> > >  		}
> > > --
> > > 2.51.0
> > >