Hi Akash, kernel test robot noticed the following build warnings: [auto build test WARNING on usb/usb-testing] [also build test WARNING on usb/usb-next usb/usb-linus linus/master v6.12-rc3 next-20241016] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Akash-Kumar/usb-dwc3-gadget-Refine-the-logic-for-resizing-Tx-FIFOs/20241016-192104 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing patch link: https://lore.kernel.org/r/20241016111904.11375-1-quic_akakum%40quicinc.com patch subject: [PATCH v6] usb: dwc3: gadget: Refine the logic for resizing Tx FIFOs config: i386-buildonly-randconfig-003-20241017 (https://download.01.org/0day-ci/archive/20241017/202410171121.i9xLy4CF-lkp@xxxxxxxxx/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241017/202410171121.i9xLy4CF-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202410171121.i9xLy4CF-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/usb/dwc3/gadget.c:782:3: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation] 782 | break; | ^ drivers/usb/dwc3/gadget.c:777:2: note: previous statement is here 777 | if (usb_endpoint_xfer_bulk(dep->endpoint.desc) || | ^ drivers/usb/dwc3/gadget.c:794:3: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation] 794 | break; | ^ drivers/usb/dwc3/gadget.c:792:2: note: previous statement is here 792 | if (usb_endpoint_xfer_bulk(dep->endpoint.desc)) | ^ 2 warnings generated. vim +/if +782 drivers/usb/dwc3/gadget.c 726 727 /* 728 * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case 729 * @dwc: pointer to our context structure 730 * 731 * This function will a best effort FIFO allocation in order 732 * to improve FIFO usage and throughput, while still allowing 733 * us to enable as many endpoints as possible. 734 * 735 * Keep in mind that this operation will be highly dependent 736 * on the configured size for RAM1 - which contains TxFifo -, 737 * the amount of endpoints enabled on coreConsultant tool, and 738 * the width of the Master Bus. 739 * 740 * In general, FIFO depths are represented with the following equation: 741 * 742 * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1 743 * 744 * In conjunction with dwc3_gadget_check_config(), this resizing logic will 745 * ensure that all endpoints will have enough internal memory for one max 746 * packet per endpoint. 747 */ 748 static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep) 749 { 750 struct dwc3 *dwc = dep->dwc; 751 int fifo_0_start; 752 int ram1_depth; 753 int fifo_size; 754 int min_depth; 755 int num_in_ep; 756 int remaining; 757 int num_fifos = 1; 758 int fifo; 759 int tmp; 760 761 if (!dwc->do_fifo_resize) 762 return 0; 763 764 /* resize IN endpoints except ep0 */ 765 if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1) 766 return 0; 767 768 /* bail if already resized */ 769 if (dep->flags & DWC3_EP_TXFIFO_RESIZED) 770 return 0; 771 772 ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7); 773 774 switch (dwc->gadget->speed) { 775 case USB_SPEED_SUPER_PLUS: 776 case USB_SPEED_SUPER: 777 if (usb_endpoint_xfer_bulk(dep->endpoint.desc) || 778 usb_endpoint_xfer_isoc(dep->endpoint.desc)) 779 num_fifos = min_t(unsigned int, 780 dep->endpoint.maxburst, 781 dwc->tx_fifo_resize_max_num); > 782 break; 783 case USB_SPEED_HIGH: 784 if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { 785 num_fifos = min_t(unsigned int, 786 usb_endpoint_maxp_mult(dep->endpoint.desc) + 1, 787 dwc->tx_fifo_resize_max_num); 788 break; 789 } 790 fallthrough; 791 case USB_SPEED_FULL: 792 if (usb_endpoint_xfer_bulk(dep->endpoint.desc)) 793 num_fifos = 2; 794 break; 795 default: 796 break; 797 } 798 799 /* FIFO size for a single buffer */ 800 fifo = dwc3_gadget_calc_tx_fifo_size(dwc, 1); 801 802 /* Calculate the number of remaining EPs w/o any FIFO */ 803 num_in_ep = dwc->max_cfg_eps; 804 num_in_ep -= dwc->num_ep_resized; 805 806 /* Reserve at least one FIFO for the number of IN EPs */ 807 min_depth = num_in_ep * (fifo + 1); 808 remaining = ram1_depth - min_depth - dwc->last_fifo_depth; 809 remaining = max_t(int, 0, remaining); 810 /* 811 * We've already reserved 1 FIFO per EP, so check what we can fit in 812 * addition to it. If there is not enough remaining space, allocate 813 * all the remaining space to the EP. 814 */ 815 fifo_size = (num_fifos - 1) * fifo; 816 if (remaining < fifo_size) 817 fifo_size = remaining; 818 819 fifo_size += fifo; 820 /* Last increment according to the TX FIFO size equation */ 821 fifo_size++; 822 823 /* Check if TXFIFOs start at non-zero addr */ 824 tmp = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0)); 825 fifo_0_start = DWC3_GTXFIFOSIZ_TXFSTADDR(tmp); 826 827 fifo_size |= (fifo_0_start + (dwc->last_fifo_depth << 16)); 828 if (DWC3_IP_IS(DWC3)) 829 dwc->last_fifo_depth += DWC3_GTXFIFOSIZ_TXFDEP(fifo_size); 830 else 831 dwc->last_fifo_depth += DWC31_GTXFIFOSIZ_TXFDEP(fifo_size); 832 833 /* Check fifo size allocation doesn't exceed available RAM size. */ 834 if (dwc->last_fifo_depth >= ram1_depth) { 835 dev_err(dwc->dev, "Fifosize(%d) > RAM size(%d) %s depth:%d\n", 836 dwc->last_fifo_depth, ram1_depth, 837 dep->endpoint.name, fifo_size); 838 if (DWC3_IP_IS(DWC3)) 839 fifo_size = DWC3_GTXFIFOSIZ_TXFDEP(fifo_size); 840 else 841 fifo_size = DWC31_GTXFIFOSIZ_TXFDEP(fifo_size); 842 843 dwc->last_fifo_depth -= fifo_size; 844 return -ENOMEM; 845 } 846 847 dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size); 848 dep->flags |= DWC3_EP_TXFIFO_RESIZED; 849 dwc->num_ep_resized++; 850 851 return 0; 852 } 853 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
