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banners=-,-,- X-VirusChecked: Checked Received: (qmail 20347 invoked from network); 18 Oct 2022 21:51:17 -0000 Received: from unknown (HELO ilclpfpp02.lenovo.com) (144.188.128.68) by server-16.tower-686.messagelabs.com with ECDHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 18 Oct 2022 21:51:17 -0000 Received: from va32lmmrp02.lenovo.com (va32lmmrp02.mot.com [10.62.176.191]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ilclpfpp02.lenovo.com (Postfix) with ESMTPS id 4MsSH90sJlzfBb2; Tue, 18 Oct 2022 21:51:17 +0000 (UTC) Received: from p1g3.mot.com (unknown [100.64.172.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: w36195) by va32lmmrp02.lenovo.com (Postfix) with ESMTPSA id 4MsSH857b0zf6WS; Tue, 18 Oct 2022 21:51:16 +0000 (UTC) From: Dan Vacura To: linux-usb@vger.kernel.org Cc: Daniel Scally , Thinh Nguyen , Jeff Vanhoof , Dan Vacura , Greg Kroah-Hartman , Jonathan Corbet , Laurent Pinchart , Felipe Balbi , Paul Elder , Michael Grzeschik , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v4 0/6] uvc gadget performance issues Date: Tue, 18 Oct 2022 16:50:36 -0500 Message-Id: <20221018215044.765044-1-w36195@motorola.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747063862525695463?= X-GMAIL-MSGID: =?utf-8?q?1747063862525695463?= Hello uvc gadget developers, V4 series updated with comments to ("usb: gadget: uvc: add configfs option for sg support") and extra stable cherry-picks dropped in ("usb: gadget: uvc: fix dropped frame after missed isoc") since a request was made to stable separately for those. V3 series updated with fixes for the two issues discussed below, plus fixes for the configfs interrupt patch. V2 series with added patches to disable these performance features at the userspace level for devices that don't work well with the UDC hw, i.e. dwc3 in this case. Also included are updates to comments for the v1 patch. Original note: I'm working on a 5.15.41 based kernel on a qcom chipset with the dwc3 controller and I'm encountering two problems related to the recent performance improvement changes: https://patchwork.kernel.org/project/linux-usb/patch/20210628155311.16762-5-m.grzeschik@pengutronix.de/ and https://patchwork.kernel.org/project/linux-usb/patch/20210628155311.16762-6-m.grzeschik@pengutronix.de/ If I revert these two changes, then I have much improved stability and a transmission problem I'm seeing is gone. Has there been any success from others on 5.15 with this uvc improvement and any recommendations for my current problems? Those being: 1) a smmu panic, snippet here:  <3>[  718.314900][  T803] arm-smmu 15000000.apps-smmu: Unhandled arm-smmu context fault from a600000.dwc3! <3>[  718.314994][  T803] arm-smmu 15000000.apps-smmu: FAR    = 0x00000000efe60800 <3>[  718.315023][  T803] arm-smmu 15000000.apps-smmu: PAR    = 0x0000000000000000 <3>[  718.315048][  T803] arm-smmu 15000000.apps-smmu: FSR    = 0x40000402 [TF R SS ] <3>[  718.315074][  T803] arm-smmu 15000000.apps-smmu: FSYNR0    = 0x5f0003 <3>[  718.315096][  T803] arm-smmu 15000000.apps-smmu: FSYNR1    = 0xaa02 <3>[  718.315117][  T803] arm-smmu 15000000.apps-smmu: context bank#    = 0x1b <3>[  718.315141][  T803] arm-smmu 15000000.apps-smmu: TTBR0  = 0x001b0000c2a92000 <3>[  718.315165][  T803] arm-smmu 15000000.apps-smmu: TTBR1  = 0x001b000000000000 <3>[  718.315192][  T803] arm-smmu 15000000.apps-smmu: SCTLR  = 0x0a5f00e7 ACTLR  = 0x00000003 <3>[  718.315245][  T803] arm-smmu 15000000.apps-smmu: CBAR  = 0x0001f300 <3>[  718.315274][  T803] arm-smmu 15000000.apps-smmu: MAIR0   = 0xf404ff44 MAIR1   = 0x0000efe4 <3>[  718.315297][  T803] arm-smmu 15000000.apps-smmu: SID = 0x40 <3>[  718.315318][  T803] arm-smmu 15000000.apps-smmu: Client info: BID=0x5, PID=0xa, MID=0x2 <3>[  718.315377][  T803] arm-smmu 15000000.apps-smmu: soft iova-to-phys=0x0000000000000000 I can reduce this panic with the proposed patch, but it still happens until I disable the "req->no_interrupt = 1" logic. 2) The frame is not fully transmitted in dwc3 with sg support enabled. There seems to be a mapping limit I'm seeing where only the roughly first 70% of the total frame is sent. Interestingly, if I allocate a larger size for the buffer upfront, in uvc_queue_setup(), like sizes[0] = video->imagesize * 3. Then the issue rarely happens. For example, when I do YUYV I see green, uninitialized data, at the bottom part of the frame. If I do MJPG with smaller filled sizes, the transmission is fine. +-------------------------+ | | | | | | | Good data | | | | | | | +-------------------------+ |xxxxxxxxxxxxxxxxxxxxxxxxx| |xxxx Bad data xxxxxxxxx| |xxxxxxxxxxxxxxxxxxxxxxxxx| +-------------------------+ Dan Vacura (4): usb: gadget: uvc: fix dropped frame after missed isoc usb: gadget: uvc: fix sg handling in error case usb: gadget: uvc: make interrupt skip logic configurable usb: gadget: uvc: add configfs option for sg support Jeff Vanhoof (2): usb: dwc3: gadget: cancel requests instead of release after missed isoc usb: gadget: uvc: fix sg handling during video encode .../ABI/testing/configfs-usb-gadget-uvc | 2 + Documentation/usb/gadget-testing.rst | 6 +++ drivers/usb/dwc3/core.h | 1 + drivers/usb/dwc3/gadget.c | 38 +++++++++++++------ drivers/usb/gadget/function/f_uvc.c | 4 ++ drivers/usb/gadget/function/u_uvc.h | 2 + drivers/usb/gadget/function/uvc.h | 2 + drivers/usb/gadget/function/uvc_configfs.c | 4 ++ drivers/usb/gadget/function/uvc_queue.c | 18 +++++++-- drivers/usb/gadget/function/uvc_video.c | 28 ++++++++++---- 10 files changed, 81 insertions(+), 24 deletions(-)