From patchwork Wed Jan 8 01:21:47 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 13929813 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 79AA6155382; Wed, 8 Jan 2025 01:22:45 +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=1736299368; cv=none; b=EFT3oQqF0VqS6PsPVZetFmNehHZaMt6N2zybAz1Bv/BoQl7hOOPPZFTDEvGKsLopQdGvxsTS6Gum3Fxd65oH/xiFCgley5uXSDYrIqsW9SJrAgKxlETe4JIurA9NmJF9Knhr9mJ6fz0FoD79UWH9h6j/cRYMTt6TWQ7ILhfjxsw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736299368; c=relaxed/simple; bh=00ovhSUsrpqPmeg9Z97Mold1re0pm4qXWH7dZbojWMc=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mHAG7RkVzr3Vor630q1iOgoiRtRCTN5NfmwV7RCduJC9ueRKsArZO7bf8FNBbjvAxrcsbGtQDPTfzxsOZdXlL6IEObsDRLPwjLnldxehvSbzBUnjDDS6MWpkiHhIOhxc/hCqymYDW2agQMGGyvS1Q6w1M/LE35x8szCvKadul3M= 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=Bx5/pd5x; 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="Bx5/pd5x" 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 507E4TMt016204; Wed, 8 Jan 2025 01:22:27 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= IdzR6SU8FWDkEFEo5Q8AckTbqJJi2y2HoHkJbCidabY=; b=Bx5/pd5xk9ehwwzj 24Mm95MDmwRD869AiOnlBm27bXo74ejMjZrweMt9mnYPagLvZqB3g4RKAMXQtzsW 4g9H10BDXeHBlF51vYJLtKFmnQ0U0NG7mnFKcXbiqO8U0zIEuW9o4HWj/Cc894dF 1HaQv0Li9kGsCuzOANZbguUNfOxLifzjiaZ38tTNqFJ3bL4AR+4y5tGdttAWVlSI Gqlm4Qb8+mVnKbK5K2zz6xqgvETIKSBRJJ1IQxFr+o1ENUdRWgYFHj7BADCb8Vic EnG5EViPdjCAUL1fsKSzn0jH14PztS2ijvdVeh8iZCCt5xKiNrj+kLJxTfP7XZv/ N6UAYw== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4415qahg00-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 08 Jan 2025 01:22:26 +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 5081MQVg027979 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 8 Jan 2025 01:22:26 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; Tue, 7 Jan 2025 17:22:25 -0800 From: Wesley Cheng To: , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v32 06/32] usb: host: xhci: Notify xHCI sideband on transfer ring free Date: Tue, 7 Jan 2025 17:21:47 -0800 Message-ID: <20250108012213.1659364-7-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250108012213.1659364-1-quic_wcheng@quicinc.com> References: <20250108012213.1659364-1-quic_wcheng@quicinc.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) 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: eteVyTk1cI7sydYjOPfxpr5bvJ-iQpRh X-Proofpoint-GUID: eteVyTk1cI7sydYjOPfxpr5bvJ-iQpRh 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 mlxscore=0 phishscore=0 impostorscore=0 mlxlogscore=825 suspectscore=0 bulkscore=0 spamscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501080007 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 6b58d29f57cd..cd1bdba6a9e3 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 7ec23e6e27d0..233c3e16d804 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 */