From patchwork Thu Jun 17 09:58:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 12327245 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1774FC2B9F4 for ; Thu, 17 Jun 2021 09:58:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 03EC7611CE for ; Thu, 17 Jun 2021 09:58:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231339AbhFQKAh (ORCPT ); Thu, 17 Jun 2021 06:00:37 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:42587 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230473AbhFQKAg (ORCPT ); Thu, 17 Jun 2021 06:00:36 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1623923908; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=WWGll7HmhmEFlNTG8J2i0OkkvjNU8iEWPNPSVycSiDY=; b=AaawYjibMGnbZUZqj1SBbwUeTljaxtiOnvVyQMBHJWv1HG+sVr00A0+UNcxXTtWCrsy2eABk Tw3ZQljexWOHMUDiu8n4U6cSGXMpNVkZOSPAhLrLSIPCATx/64tD9hVNe9bXoZxKiKo9dAS5 4A7SUVEdDqjr1n93MrVYEEDCJ3o= X-Mailgun-Sending-Ip: 198.61.254.9 X-Mailgun-Sid: WyIxZTE2YSIsICJsaW51eC11c2JAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-east-1.postgun.com with SMTP id 60cb1cc351f29e6bae548dd1 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 17 Jun 2021 09:58:27 GMT Sender: wcheng=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id C97B4C43146; Thu, 17 Jun 2021 09:58:25 +0000 (UTC) Received: from wcheng-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: wcheng) by smtp.codeaurora.org (Postfix) with ESMTPSA id B7A06C433D3; Thu, 17 Jun 2021 09:58:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B7A06C433D3 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=wcheng@codeaurora.org From: Wesley Cheng To: balbi@kernel.org, gregkh@linuxfoundation.org, robh+dt@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org, frowand.list@gmail.com Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, jackp@codeaurora.org, fntoth@gmail.com, heikki.krogerus@linux.intel.com, andy.shevchenko@gmail.com, Wesley Cheng Subject: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting Date: Thu, 17 Jun 2021 02:58:13 -0700 Message-Id: <1623923899-16759-1-git-send-email-wcheng@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Changes in V10: - Fixed compilation errors in config where OF is not used (error due to unknown symbol for of_add_property()). Add of_add_property() stub. - Fixed compilation warning for incorrect argument being passed to dwc3_mdwidth Changes in V9: - Fixed incorrect patch in series. Removed changes in DTSI, as dwc3-qcom will add the property by default from the kernel. Changes in V8: - Rebased to usb-testing - Using devm_kzalloc for adding txfifo property in dwc3-qcom - Removed DWC3 QCOM ACPI property for enabling the txfifo resize Changes in V7: - Added a new property tx-fifo-max-num for limiting how much fifo space the resizing logic can allocate for endpoints with large burst values. This can differ across platforms, and tie in closely with overall system latency. - Added recommended checks for DWC32. - Added changes to set the tx-fifo-resize property from dwc3-qcom by default instead of modifying the current DTSI files. - Added comments on all APIs/variables introduced. - Updated the DWC3 YAML to include a better description of the tx-fifo-resize property and added an entry for tx-fifo-max-num. Changes in V6: - Rebased patches to usb-testing. - Renamed to PATCH series instead of RFC. - Checking for fs_descriptors instead of ss_descriptors for determining the endpoint count for a particular configuration. - Re-ordered patch series to fix patch dependencies. Changes in V5: - Added check_config() logic, which is used to communicate the number of EPs used in a particular configuration. Based on this, the DWC3 gadget driver has the ability to know the maximum number of eps utilized in all configs. This helps reduce unnecessary allocation to unused eps, and will catch fifo allocation issues at bind() time. - Fixed variable declaration to single line per variable, and reverse xmas. - Created a helper for fifo clearing, which is used by ep0.c Changes in V4: - Removed struct dwc3* as an argument for dwc3_gadget_resize_tx_fifos() - Removed WARN_ON(1) in case we run out of fifo space Changes in V3: - Removed "Reviewed-by" tags - Renamed series back to RFC - Modified logic to ensure that fifo_size is reset if we pass the minimum threshold. Tested with binding multiple FDs requesting 6 FIFOs. Changes in V2: - Modified TXFIFO resizing logic to ensure that each EP is reserved a FIFO. - Removed dev_dbg() prints and fixed typos from patches - Added some more description on the dt-bindings commit message Currently, there is no functionality to allow for resizing the TXFIFOs, and relying on the HW default setting for the TXFIFO depth. In most cases, the HW default is probably sufficient, but for USB compositions that contain multiple functions that require EP bursting, the default settings might not be enough. Also to note, the current SW will assign an EP to a function driver w/o checking to see if the TXFIFO size for that particular EP is large enough. (this is a problem if there are multiple HW defined values for the TXFIFO size) It is mentioned in the SNPS databook that a minimum of TX FIFO depth = 3 is required for an EP that supports bursting. Otherwise, there may be frequent occurences of bursts ending. For high bandwidth functions, such as data tethering (protocols that support data aggregation), mass storage, and media transfer protocol (over FFS), the bMaxBurst value can be large, and a bigger TXFIFO depth may prove to be beneficial in terms of USB throughput. (which can be associated to system access latency, etc...) It allows for a more consistent burst of traffic, w/o any interruptions, as data is readily available in the FIFO. With testing done using the mass storage function driver, the results show that with a larger TXFIFO depth, the bandwidth increased significantly. Test Parameters: - Platform: Qualcomm SM8150 - bMaxBurst = 6 - USB req size = 256kB - Num of USB reqs = 16 - USB Speed = Super-Speed - Function Driver: Mass Storage (w/ ramdisk) - Test Application: CrystalDiskMark Results: TXFIFO Depth = 3 max packets Test Case | Data Size | AVG tput (in MB/s) ------------------------------------------- Sequential|1 GB x | Read |9 loops | 193.60 | | 195.86 | | 184.77 | | 193.60 ------------------------------------------- TXFIFO Depth = 6 max packets Test Case | Data Size | AVG tput (in MB/s) ------------------------------------------- Sequential|1 GB x | Read |9 loops | 287.35 | | 304.94 | | 289.64 | | 293.61 ------------------------------------------- Wesley Cheng (6): usb: gadget: udc: core: Introduce check_config to verify USB configuration usb: gadget: configfs: Check USB configuration before adding usb: dwc3: Resize TX FIFOs to meet EP bursting requirements of: Add stub for of_add_property() usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default dt-bindings: usb: dwc3: Update dwc3 TX fifo properties .../devicetree/bindings/usb/snps,dwc3.yaml | 15 +- drivers/usb/dwc3/core.c | 9 + drivers/usb/dwc3/core.h | 15 ++ drivers/usb/dwc3/dwc3-qcom.c | 9 + drivers/usb/dwc3/ep0.c | 2 + drivers/usb/dwc3/gadget.c | 212 +++++++++++++++++++++ drivers/usb/gadget/configfs.c | 22 +++ drivers/usb/gadget/udc/core.c | 25 +++ include/linux/of.h | 5 + include/linux/usb/gadget.h | 5 + 10 files changed, 317 insertions(+), 2 deletions(-)