From patchwork Fri Dec 13 23:53:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 850814 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C5E21A8F81; Fri, 13 Dec 2024 23:54:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734134076; cv=none; b=T2qPb3j+k4urKf+jQvYL2C+w+EQgfe7Yd34LIRumTuH2VZUcAyBkOOYL/D1znoVBzxLDxYvdTpgGNubZy9G+mVdAH0uZ/5mxIa9one856i4jKTQfTP+B4RdGmOAOFupvJohbXq4QRoaTTzqtt6y2Z9oulx0dmegDu/KQqazXQjw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734134076; c=relaxed/simple; bh=42e10Snc0wUbVdKrZPgpf61d0V6+qrzPtHxy89amw+g=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=R2jyt0Jzg7s5SdBsbCjNAbq6MntxESDmUblgob8zEEz1ahpb+UaAGM9ZvPXwi8jQBRhnJbhSmw7neaXGTjVyq2Ulmtr5ZB1fzTPNLOx+csfwMa+0iv6sHZdHOJuf3u6rJ12xW8iJ6xcmKKbE+BsXPBfImXDjzdgtoG1Q8lKHb3s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=G2vMGim8; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="G2vMGim8" Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4BDBTqLX001435; Fri, 13 Dec 2024 23:54:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= W0PbZsgqeupe7o3JmCwWNTApsoNxUiOoO31kTbEPC3w=; b=G2vMGim82yp3WQEN s2qr4+appkuXYbD9ibUTjLqzXspagQytM+V13Q6dA56qgw/oVlBi/heOCTrtwF5K QXH7j0GKl06WNQXmytPjMvhXSYCrj/WCmNj73mjYv1XcM6sFcs5BlHKFlHMIV/fv KcxYkkf3l/5q7M0sU2xS1AZOyc8B+Mg8KZDdxhb8+AXcd6mzyipXHLVo8MZ86kub 2Uw8tZ7AELXPYnLgvvV8J4+3T5XbBOm4Lwtn0vZvtsBgTc/02lkjHwZNdhbMFrgl LjqMoqaKYwC1/M5oOkq3AHtgsbpENFMOVmhuKPmJ+9hB/BLyRkDkbr7xOUZ1EwsV gh53Tw== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 43gm3s1kvt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 13 Dec 2024 23:54:16 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA05.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 4BDNsFg6026138 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 13 Dec 2024 23:54:15 GMT Received: from hu-wcheng-lv.qualcomm.com (10.49.16.6) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 13 Dec 2024 15:54:15 -0800 From: Wesley Cheng To: , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v31 06/32] usb: host: xhci: Notify xHCI sideband on transfer ring free Date: Fri, 13 Dec 2024 15:53:37 -0800 Message-ID: <20241213235403.4109199-7-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241213235403.4109199-1-quic_wcheng@quicinc.com> References: <20241213235403.4109199-1-quic_wcheng@quicinc.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: R0dxJvTvqOYVeIuHKQsA51IsDG_IN3KF X-Proofpoint-GUID: R0dxJvTvqOYVeIuHKQsA51IsDG_IN3KF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 impostorscore=0 phishscore=0 mlxscore=0 bulkscore=0 spamscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 malwarescore=0 mlxlogscore=832 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412130170 In the case of handling a USB bus reset, the xhci_discover_or_reset_device can run without first notifying the xHCI sideband client driver to stop or prevent the use of the transfer ring. It was seen that when a bus reset situation happened, the USB offload driver was attempting to fetch the xHCI transfer ring information, which was already freed. Signed-off-by: Wesley Cheng --- drivers/usb/host/xhci-sideband.c | 29 ++++++++++++++++++++++++++++- drivers/usb/host/xhci.c | 3 +++ include/linux/usb/xhci-sideband.h | 30 +++++++++++++++++++++++++++++- 3 files changed, 60 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/xhci-sideband.c b/drivers/usb/host/xhci-sideband.c index baf252a3de48..ffa6f1b825ff 100644 --- a/drivers/usb/host/xhci-sideband.c +++ b/drivers/usb/host/xhci-sideband.c @@ -88,6 +88,30 @@ __xhci_sideband_remove_endpoint(struct xhci_sideband *sb, struct xhci_virt_ep *e /* sideband api functions */ +/** + * xhci_sideband_notify_ep_ring_free - notify client of xfer ring free + * @sb: sideband instance for this usb device + * @ep_index: usb endpoint index + * + * Notifies the xHCI sideband client driver of a xHCI transfer ring free + * routine. This will allow for the client to ensure that all transfers + * are completed. + * + * The callback should be synchronous, as the ring free happens after. + */ +void xhci_sideband_notify_ep_ring_free(struct xhci_sideband *sb, + unsigned int ep_index) +{ + struct xhci_sideband_event evt; + + evt.type = XHCI_SIDEBAND_XFER_RING_FREE; + evt.evt_data = &ep_index; + + if (sb->notify_client) + sb->notify_client(sb->intf, &evt); +} +EXPORT_SYMBOL_GPL(xhci_sideband_notify_ep_ring_free); + /** * xhci_sideband_add_endpoint - add endpoint to sideband access list * @sb: sideband instance for this usb device @@ -344,7 +368,9 @@ EXPORT_SYMBOL_GPL(xhci_sideband_interrupter_id); * Return: pointer to a new xhci_sideband instance if successful. NULL otherwise. */ struct xhci_sideband * -xhci_sideband_register(struct usb_interface *intf, enum xhci_sideband_type type) +xhci_sideband_register(struct usb_interface *intf, enum xhci_sideband_type type, + int (*notify_client)(struct usb_interface *intf, + struct xhci_sideband_event *evt)) { struct usb_device *udev = interface_to_usbdev(intf); struct usb_hcd *hcd = bus_to_hcd(udev->bus); @@ -383,6 +409,7 @@ xhci_sideband_register(struct usb_interface *intf, enum xhci_sideband_type type) sb->vdev = vdev; sb->intf = intf; sb->type = type; + sb->notify_client = notify_client; vdev->sideband = sb; spin_unlock_irq(&xhci->lock); diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 514a36914ed9..972395d297f1 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "xhci.h" #include "xhci-trace.h" @@ -3909,6 +3910,8 @@ static int xhci_discover_or_reset_device(struct usb_hcd *hcd, } if (ep->ring) { + if (ep->sideband) + xhci_sideband_notify_ep_ring_free(ep->sideband, i); xhci_debugfs_remove_endpoint(xhci, virt_dev, i); xhci_free_endpoint_ring(xhci, virt_dev, i); } diff --git a/include/linux/usb/xhci-sideband.h b/include/linux/usb/xhci-sideband.h index f6023b1b062b..72aa17eb068d 100644 --- a/include/linux/usb/xhci-sideband.h +++ b/include/linux/usb/xhci-sideband.h @@ -21,6 +21,20 @@ enum xhci_sideband_type { XHCI_SIDEBAND_VENDOR, }; +enum xhci_sideband_notify_type { + XHCI_SIDEBAND_XFER_RING_FREE, +}; + +/** + * struct xhci_sideband_event - sideband event + * @type: notifier type + * @evt_data: event data + */ +struct xhci_sideband_event { + enum xhci_sideband_notify_type type; + void *evt_data; +}; + /** * struct xhci_sideband - representation of a sideband accessed usb device. * @xhci: The xhci host controller the usb device is connected to @@ -29,6 +43,7 @@ enum xhci_sideband_type { * @ir: event handling and buffer for sideband accessed device * @mutex: mutex for sideband operations * @intf: USB sideband client interface + * @notify_client: callback for xHCI sideband sequences * * FIXME usb device accessed via sideband Keeping track of sideband accessed usb devices. */ @@ -43,10 +58,14 @@ struct xhci_sideband { struct mutex mutex; struct usb_interface *intf; + int (*notify_client)(struct usb_interface *intf, + struct xhci_sideband_event *evt); }; struct xhci_sideband * -xhci_sideband_register(struct usb_interface *intf, enum xhci_sideband_type type); +xhci_sideband_register(struct usb_interface *intf, enum xhci_sideband_type type, + int (*notify_client)(struct usb_interface *intf, + struct xhci_sideband_event *evt)); void xhci_sideband_unregister(struct xhci_sideband *sb); int @@ -70,4 +89,13 @@ void xhci_sideband_remove_interrupter(struct xhci_sideband *sb); int xhci_sideband_interrupter_id(struct xhci_sideband *sb); + +#if IS_ENABLED(CONFIG_USB_XHCI_SIDEBAND) +void xhci_sideband_notify_ep_ring_free(struct xhci_sideband *sb, + unsigned int ep_index); +#else +static inline void xhci_sideband_notify_ep_ring_free(struct xhci_sideband *sb, + unsigned int ep_index) +{ } +#endif /* IS_ENABLED(CONFIG_USB_XHCI_SIDEBAND) */ #endif /* __LINUX_XHCI_SIDEBAND_H */