Hi all, I am a user of dwc3 USB host controller, I found there are some confused behavior of trb event on this controller. When I run a raw USB data transfer(run bulk in&out transfer with libusb) and iperf3(over rndis) at the same time, there are some strange interrupts occurs and make the driver report error(ERROR DMA transfer). And: 1. this problem only hapened in USB SS mode 2. this problem seems not hapen when I run same test case with other xhci controller(such as asmedia/intel pcie xhci controller) on PC. 3. the kernel version is 4.9.130 I think this may be a hw bug of DWC3 USB controller, could anyone please give me some help to debug this problem？ The detail log see as below: [ 131.074102] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: xHCI handle event, 8000 27630 [ 131.074109] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: process trans event : ep_index = 11, event_dma = 1eb13e90 27631 [ 131.074117] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: inc_deq, start trb dma = 1eb13e90, dequeue_p = e482ce90, trb_free num = 1871, ring type = 2 27632 [ 131.074123] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: inc_deq 111, start trb dma = 1eb13ea0, dequeue_p = e482cea0, trb_free num = 1872, ring type = 2 27633 [ 131.074130] c0 3 (ksoftirqd/0) xhci-hcd xh[ 133.057617] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 16 comp_code 1 27634 [ 133.059312] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: Looking for event-dma 000000001eb0fff0 trb-start 000000001eb10000 trb-end 000000001eb10000 seg-start 000000001eb10000 seg-end 000000001eb10ff0 27635 [ 133.066215] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 16 comp_code 1 27636 [ 133.067908] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: Looking for event-dma 000000001eb10000 trb-start 000000001eb10230 trb-end 000000001eb10230 seg-start 000000001eb10000 seg-end 000000001eb10ff0 27637 [ 133.070572] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 16 comp_code 1 27638 [ 133.072260] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: Looking for event-dma 000000001eb10010 trb-start 000000001eb10230 trb-end 000000001eb10230 seg-start 000000001eb10000 seg-end 000000001eb10ff0 27639 [ 133.075052] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 16 comp_code 1 27640 [ 133.076739] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: Looking for event-dma 000000001eb10020 trb-start 000000001eb10230 trb-end 000000001eb10230 seg-start 000000001eb10000 seg-end 000000001eb10ff0 27641 [ 133.079472] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 16 comp_code 1 27642 [ 133.081159] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: Looking for event-dma 000000001eb10030 trb-start 000000001eb10230 trb-end 000000001eb10230 seg-start 000000001eb10000 seg-end 000000001eb10ff0 27643 [ 133.083896] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 16 comp_code 1 27644 [ 133.085584] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: Looking for event-dma 000000001eb10040 trb-start 000000001eb10230 trb-end 000000001eb10230 seg-start 000000001eb10000 seg-end 000000001eb10ff0 27645 [ 133.088328] c0 3 (ksoftirqd/0) xhci-hcd xhci-hcd.0.auto: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 16 comp_code 1 1. According these logs above the link trb whose address is 0x1eb0fff0 occurs a transfer event, but this DMA address is not in the trb ring, then the driver report an error(and followed a few error logs witch invalid DMA address). 2. I dump the data of the address(0x1eb0fff0) and find the IOC bit is not set, see as below: # dump_reg.sh 0x1eb0fff0 4 0x1eb0fff0:0x1EB10000 0x00000000 0x00000000 0x00001800
