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Message-ID: <CAHN5xi0mf8G4ODMQ9jDXAM4CRXtafZeMh_2KF7efbiFJahO4bw@mail.gmail.com>
Date: Sat, 1 Mar 2025 10:05:11 +0800
From: Kuangyi Chiang <ki.chiang65@...il.com>
To: Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc: michal.pecio@...il.com, gregkh@...uxfoundation.org,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFT PATCH] xhci: Handle spurious events on Etron host isoc enpoints
Hi,
Thanks for the patch.
Mathias Nyman <mathias.nyman@...ux.intel.com> 於 2025年3月1日 週六 上午12:17寫道：
>
> Unplugging a USB3.0 webcam from Etron hosts while streaming results
> in errors like this:
>
> [ 2.646387] xhci_hcd 0000:03:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 18 comp_code 13
> [ 2.646446] xhci_hcd 0000:03:00.0: Looking for event-dma 000000002fdf8630 trb-start 000000002fdf8640 trb-end 000000002fdf8650
> [ 2.646560] xhci_hcd 0000:03:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 18 comp_code 13
> [ 2.646568] xhci_hcd 0000:03:00.0: Looking for event-dma 000000002fdf8660 trb-start 000000002fdf8670 trb-end 000000002fdf8670
>
> Etron xHC generates two transfer events for the TRB if an error is
> detected while processing the last TRB of an isoc TD.
>
> The first event can be any sort of error (like USB Transaction or
> Babble Detected, etc), and the final event is Success.
>
> The xHCI driver will handle the TD after the first event and remove it
> from its internal list, and then print an "Transfer event TRB DMA ptr
> not part of current TD" error message after the final event.
>
> Commit 5372c65e1311 ("xhci: process isoc TD properly when there was a
> transaction error mid TD.") is designed to address isoc transaction
> errors, but unfortunately it doesn't account for this scenario.
>
> This issue is similar to the XHCI_SPURIOUS_SUCCESS case where a success
> event follows a 'short transfer' event, but the TD the event points to
> is already given back.
>
> Expand the spurious success 'short transfer' event handling to cover
> the spurious success after error on Etron hosts.
>
> Kuangyi Chiang reported this issue and submitted a different solution
> based on using error_mid_td. This commit message is mostly taken
> from that patch.
>
> Reported-by: Kuangyi Chiang <ki.chiang65@...il.com>
> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
> ---
> drivers/usb/host/xhci-ring.c | 36 +++++++++++++++++++++++++-----------
> drivers/usb/host/xhci.h | 2 +-
> 2 files changed, 26 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
> index 965bffce301e..3d3e6cd69019 100644
> --- a/drivers/usb/host/xhci-ring.c
> +++ b/drivers/usb/host/xhci-ring.c
> @@ -2644,6 +2644,22 @@ static int handle_transferless_tx_event(struct xhci_hcd *xhci, struct xhci_virt_
> return 0;
> }
>
> +static bool xhci_spurious_success_tx_event(struct xhci_hcd *xhci,
> + struct xhci_ring *ring)
> +{
> + switch (ring->old_trb_comp_code) {
> + case COMP_SHORT_PACKET:
> + return xhci->quirks & XHCI_SPURIOUS_SUCCESS;
> + case COMP_USB_TRANSACTION_ERROR:
> + case COMP_BABBLE_DETECTED_ERROR:
> + case COMP_ISOCH_BUFFER_OVERRUN:
> + return xhci->quirks & XHCI_ETRON_HOST &&
> + ring->type == TYPE_ISOC;
> + default:
> + return false;
> + }
> +}
> +
> /*
> * If this function returns an error condition, it means it got a Transfer
> * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
> @@ -2697,8 +2713,8 @@ static int handle_tx_event(struct xhci_hcd *xhci,
> case COMP_SUCCESS:
> if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
> trb_comp_code = COMP_SHORT_PACKET;
> - xhci_dbg(xhci, "Successful completion on short TX for slot %u ep %u with last td short %d\n",
> - slot_id, ep_index, ep_ring->last_td_was_short);
> + xhci_dbg(xhci, "Successful completion on short TX for slot %u ep %u with last td comp code %d\n",
> + slot_id, ep_index, ep_ring->old_trb_comp_code);
> }
> break;
> case COMP_SHORT_PACKET:
> @@ -2846,7 +2862,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
> */
> if (trb_comp_code != COMP_STOPPED &&
> trb_comp_code != COMP_STOPPED_LENGTH_INVALID &&
> - !ep_ring->last_td_was_short) {
> + !xhci_spurious_success_tx_event(xhci, ep_ring)) {
> xhci_warn(xhci, "Event TRB for slot %u ep %u with no TDs queued\n",
> slot_id, ep_index);
> }
> @@ -2890,11 +2906,12 @@ static int handle_tx_event(struct xhci_hcd *xhci,
>
> /*
> * Some hosts give a spurious success event after a short
> - * transfer. Ignore it.
> + * transfer or error on last TRB. Ignore it.
> */
> - if ((xhci->quirks & XHCI_SPURIOUS_SUCCESS) &&
> - ep_ring->last_td_was_short) {
> - ep_ring->last_td_was_short = false;
> + if (xhci_spurious_success_tx_event(xhci, ep_ring)) {
> + xhci_dbg(xhci, "Spurious event dma %pad, comp_code %u after %u\n",
> + &ep_trb_dma, trb_comp_code, ep_ring->old_trb_comp_code);
> + ep_ring->old_trb_comp_code = trb_comp_code;
> return 0;
> }
>
> @@ -2922,10 +2939,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
> */
> } while (ep->skip);
>
> - if (trb_comp_code == COMP_SHORT_PACKET)
> - ep_ring->last_td_was_short = true;
> - else
> - ep_ring->last_td_was_short = false;
> + ep_ring->old_trb_comp_code = trb_comp_code;
>
> ep_trb = &ep_seg->trbs[(ep_trb_dma - ep_seg->dma) / sizeof(*ep_trb)];
> trace_xhci_handle_transfer(ep_ring, (struct xhci_generic_trb *) ep_trb, ep_trb_dma);
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index 8c164340a2c3..c75c2c12ce53 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1371,7 +1371,7 @@ struct xhci_ring {
> unsigned int num_trbs_free; /* used only by xhci DbC */
> unsigned int bounce_buf_len;
> enum xhci_ring_type type;
> - bool last_td_was_short;
> + u32 last_td_comp_code;
Should be changed to old_trb_comp_code.
> struct radix_tree_root *trb_address_map;
> };
>
> --
> 2.43.0
>
I'll test this later.
Thanks,
Kuangyi Chiang
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