Re: [PATCH 1/1] usb: cdns3: gadget: fix new urb never complete if ep cancel requests before.

From: Zhi Li
Date: Tue Nov 30 2021 - 10:26:32 EST

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On Sat, Nov 20, 2021 at 1:19 AM Peter Chen <peter.chen@xxxxxxxxxx> wrote:
>
> Delete '.' please
>
> Reply-To:
> In-Reply-To: <20211117204447.16869-1-Frank.Li@xxxxxxx>
>
> On 21-11-17 14:44:47, Frank Li wrote:
> > This issue was found at android12 MTP.
> > 1. MTP submit many out urb request.
> > 2. Cancel left requests (>20) when enough data get from host
> > 3. Send ACK by IN endpoint.
> > 4. MTP submit new out urb request.
> > 5. 4's urb never complete.
>
> New out request new complete?

New out request never complete.
>
>
> >
> > TRACE LOG:
> >
> > MtpServer-2157 [000] d..3 1287.150391: cdns3_ep_dequeue: ep1out: req: 00000000299e6836, req buff 000000009df42287, length: 0/16384 zsi, status: -115, trb: [start:87, end:87: virt addr 0x80004000ffd50420], flags:1 SID: 0
> > MtpServer-2157 [000] d..3 1287.150410: cdns3_gadget_giveback: ep1out: req: 00000000299e6836, req buff 000000009df42287, length: 0/16384 zsi, status: -104, trb: [start:87, end:87: virt addr 0x80004000ffd50420], flags:0 SID: 0
> > MtpServer-2157 [000] d..3 1287.150433: cdns3_ep_dequeue: ep1out: req: 0000000080b7bde6, req buff 000000009ed5c556, length: 0/16384 zsi, status: -115, trb: [start:88, end:88: virt addr 0x80004000ffd5042c], flags:1 SID: 0
> > MtpServer-2157 [000] d..3 1287.150446: cdns3_gadget_giveback: ep1out: req: 0000000080b7bde6, req buff 000000009ed5c556, length: 0/16384 zsi, status: -104, trb: [start:88, end:88: virt addr 0x80004000ffd5042c], flags:0 SID: 0
> > ....
> > MtpServer-2157 [000] d..1 1293.630410: cdns3_alloc_request: ep1out: req: 00000000afbccb7d, req buff 0000000000000000, length: 0/0 zsi, status: 0, trb: [start:0, end:0: virt addr (null)], flags:0 SID: 0
> > MtpServer-2157 [000] d..2 1293.630421: cdns3_ep_queue: ep1out: req: 00000000afbccb7d, req buff 00000000871caf90, length: 0/512 zsi, status: -115, trb: [start:0, end:0: virt addr (null)], flags:0 SID: 0
> > MtpServer-2157 [000] d..2 1293.630445: cdns3_wa1: WA1: ep1out set guard
> > MtpServer-2157 [000] d..2 1293.630450: cdns3_wa1: WA1: ep1out restore cycle bit
> > MtpServer-2157 [000] d..2 1293.630453: cdns3_prepare_trb: ep1out: trb 000000007317b3ee, dma buf: 0xffd5bc00, size: 512, burst: 128 ctrl: 0x00000424 (C=0, T=0, ISP, IOC, Normal) SID:0 LAST_SID:0
> > MtpServer-2157 [000] d..2 1293.630460: cdns3_doorbell_epx: ep1out, ep_trbaddr ffd50414
> > ....
> > irq/241-5b13000-2154 [000] d..1 1293.680849: cdns3_epx_irq: IRQ for ep1out: 01000408 ISP , ep_traddr: ffd508ac ep_last_sid: 00000000 use_streams: 0
> > irq/241-5b13000-2154 [000] d..1 1293.680858: cdns3_complete_trb: ep1out: trb 0000000021a11b54, dma buf: 0xffd50420, size: 16384, burst: 128 ctrl: 0x00001810 (C=0, T=0, CHAIN, LINK) SID:0 LAST_SID:0
> > irq/241-5b13000-2154 [000] d..1 1293.680865: cdns3_request_handled: Req: 00000000afbccb7d not handled, DMA pos: 185, ep deq: 88, ep enq: 185, start trb: 184, end trb: 184
> >
> > Actually DMA pos already bigger than prevous submit request afbccb7d's TRB (184-184). The reason of (not handled) is that deq position is wrong.
>
> %s/prevous/previous. Ok, so the reason is dep position is wrong, and
> %cdns3_trb_handled returns false, so the completion is not called?

Yes, cdns_trb_handled return false. so the completion is not called.

>
> >
> > The TRB link is below when irq happen.
> >
> > DEQ LINK LINK LINK LINK LINK .... TRB(afbccb7d):START DMA(EP_TRADDR).
> >
> > Original code check LINK TRB, but DEQ just move one step.
> >
> > LINK DEQ LINK LINK LINK LINK .... TRB(afbccb7d):START DMA(EP_TRADDR).
> >
> > This patch skip all LINK TRB and sync DEQ to trb's start.
> >
> > LINK LINK LINK LINK LINK .... DEQ = TRB(afbccb7d):START DMA(EP_TRADDR).
> >
> > Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> > Signed-off-by: Jun Li <jun.li@xxxxxxx>
> > ---
> > drivers/usb/cdns3/cdns3-gadget.c | 23 ++++++++++++-----------
> > 1 file changed, 12 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> > index 1f3b4a1422126..01d0e09a87ad7 100644
> > --- a/drivers/usb/cdns3/cdns3-gadget.c
> > +++ b/drivers/usb/cdns3/cdns3-gadget.c
> > @@ -337,17 +337,21 @@ static void cdns3_ep_inc_deq(struct cdns3_endpoint *priv_ep)
> > cdns3_ep_inc_trb(&priv_ep->dequeue, &priv_ep->ccs, priv_ep->num_trbs);
> > }
> >
> > -static void cdns3_move_deq_to_next_trb(struct cdns3_request *priv_req)
> > +static void cdns3_sync_deq_to_trb(struct cdns3_request *priv_req)
> > {
> > struct cdns3_endpoint *priv_ep = priv_req->priv_ep;
> > - int current_trb = priv_req->start_trb;
> > + struct cdns3_trb *trb = priv_ep->trb_pool + priv_ep->dequeue;
> >
> > - while (current_trb != priv_req->end_trb) {
> > - cdns3_ep_inc_deq(priv_ep);
> > - current_trb = priv_ep->dequeue;
> > - }
> > + if (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) {
> > + while (priv_ep->dequeue != priv_req->start_trb) {
> > + dev_dbg(priv_ep->cdns3_dev->dev, "Remove TRB_LINK");
> > + trb = priv_ep->trb_pool + priv_ep->dequeue;
> > + WARN_ON_ONCE(TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) != TRB_LINK);
> > + trace_cdns3_complete_trb(priv_ep, trb);
> >
> > - cdns3_ep_inc_deq(priv_ep);
> > + cdns3_ep_inc_deq(priv_ep);
> > + }
> > + }
> > }
> >
> > /**
> > @@ -1518,10 +1522,7 @@ static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
> > trb = priv_ep->trb_pool + priv_ep->dequeue;
> >
> > /* Request was dequeued and TRB was changed to TRB_LINK. */
> > - if (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) {
> > - trace_cdns3_complete_trb(priv_ep, trb);
> > - cdns3_move_deq_to_next_trb(priv_req);
> > - }
> > + cdns3_sync_deq_to_trb(priv_req);
>
> > So, the issue is it doesn't skip all link trb's handler? How about below Change?

Yes, below change can work. let me send v2 patch
>
>
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 1f3b4a142212..8463e5429cb0 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -337,19 +337,6 @@ static void cdns3_ep_inc_deq(struct cdns3_endpoint *priv_ep)
> cdns3_ep_inc_trb(&priv_ep->dequeue, &priv_ep->ccs, priv_ep->num_trbs);
> }
>
> -static void cdns3_move_deq_to_next_trb(struct cdns3_request *priv_req)
> -{
> - struct cdns3_endpoint *priv_ep = priv_req->priv_ep;
> - int current_trb = priv_req->start_trb;
> -
> - while (current_trb != priv_req->end_trb) {
> - cdns3_ep_inc_deq(priv_ep);
> - current_trb = priv_ep->dequeue;
> - }
> -
> - cdns3_ep_inc_deq(priv_ep);
> -}
> -
> /**
> * cdns3_allow_enable_l1 - enable/disable permits to transition to L1.
> * @priv_dev: Extended gadget object
> @@ -1517,10 +1504,11 @@ static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
>
> trb = priv_ep->trb_pool + priv_ep->dequeue;
>
> - /* Request was dequeued and TRB was changed to TRB_LINK. */
> - if (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) {
> + /* The TRB was changed as link TRB, and the request was handled at .ep_deuque */
> + while (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) {
> trace_cdns3_complete_trb(priv_ep, trb);
> - cdns3_move_deq_to_next_trb(priv_req);
> + cdns3_ep_inc_deq(priv_ep);
> + trb = priv_ep->trb_pool + priv_ep->dequeue;
> }
>
> if (!request->stream_id) {
>
> --
>
> Thanks,
> Peter Chen
>

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