From patchwork Fri Oct 11 00:05:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 834890 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 C8A4813B7BD; Fri, 11 Oct 2024 00:07:33 +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=1728605255; cv=none; b=dlvn1xa+8I3bVxXbfOgKhgKnYRCw3IkpItZO07M/KD9TMitjKldXH9osS5ZQ9GpEs0WUwuQVMAhKL/KRjH08dOM2IqsbNIkkkzOfkSQuRh7LX62uuxcsOretV1eXuLZMn8TwEkrj2m1MqmS9jESa36DD81fJ7gSf+wcPVNGov0M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728605255; c=relaxed/simple; bh=3nFyRTVOUVhLHMFASESfShsxhY8idPyIGAYXXG9qqd0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=h7hQcNFNKqqcGI4VcAeevTXRjySzrz4OcHUU6eanl8kKrFZirmCylx170I5ShTcXTSjQ5SrIeXoi3h2m7TjscTPQ10rSCxgobQYquzQJOGw1kQgev0Gig5HC+fY/xga1F26D7BtU/GUKvPJo/Y7XnHWkdoJmIIg0vEuw6F2uvU0= 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=c87inZbU; 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="c87inZbU" Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49AAc81s020937; Fri, 11 Oct 2024 00:07:04 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= SVZiV+f4SnId4RLZpdWICppkMgvqXrXjIq8fTSzECKc=; b=c87inZbUqZ4IGs2y Y0X3WwSNtQkMa39ABIomiSzn/wskp3vChcU2uKbDxI8EO7rwiA5f/DD11IeIgVfP nXtMAlKT+LZv2NCQAg9b4ulel4mbDO1QMaNRcr8bjuud2oD54nmYkacampen+USJ IHbMcJpe+xHFIOxbTA3YyA1406HggDQ8k3DMBiJWrtBSlEWqG6SYhbAFfu4dzbcJ 0yQrLRieYNMrCX8Q+pWzZmjHuPTCxlhpNxbz71swyPCQdL2x12n5xz2UFbVDu76N gTsffyN0nk3R+2L+QYQsqE6Uz7nMXiX8wdFSwoTGrLTeFN0MVy4P/USeLzZLpsmI KiYyxw== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 426db7hvjh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 11 Oct 2024 00:07:04 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA03.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 49B0746l008717 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 11 Oct 2024 00:07:04 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; Thu, 10 Oct 2024 17:07:03 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , , , , Mathias Nyman , Wesley Cheng Subject: [PATCH v28 02/33] xhci: add helper to stop endpoint and wait for completion Date: Thu, 10 Oct 2024 17:05:49 -0700 Message-ID: <20241011000650.2585600-5-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241011000650.2585600-1-quic_wcheng@quicinc.com> References: <20241011000650.2585600-1-quic_wcheng@quicinc.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) 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: j_jZrFxAuesbmGX22Mpf5o_TW1hjNWdK X-Proofpoint-GUID: j_jZrFxAuesbmGX22Mpf5o_TW1hjNWdK 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 suspectscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 bulkscore=0 malwarescore=0 mlxscore=0 phishscore=0 clxscore=1015 spamscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410100158 From: Mathias Nyman Expose xhci_stop_endpoint_sync() which is a synchronous variant of xhci_queue_stop_endpoint(). This is useful for client drivers that are using the secondary interrupters, and need to stop the current endpoint session. This does not go through the normal xhci_handle_cmd_stop_ep() command completion handler, because it utilizes the completion path to achieve synchronous behavior. Users of this API are primarily intended to be clients that maintain their own transfer rings, such as in the case of USB audio offload. Signed-off-by: Mathias Nyman Signed-off-by: Wesley Cheng --- drivers/usb/host/xhci.c | 45 +++++++++++++++++++++++++++++++++++++++++ drivers/usb/host/xhci.h | 2 ++ 2 files changed, 47 insertions(+) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index ed1bb7ed44b0..8d7566e33faf 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -2784,6 +2784,51 @@ static int xhci_reserve_bandwidth(struct xhci_hcd *xhci, return -ENOMEM; } +/* + * Synchronous XHCI stop endpoint helper. Issues the stop endpoint command and + * waits for the command completion before returning. This does not call + * xhci_handle_cmd_stop_ep(), which has additional handling for 'context error' + * cases, along with transfer ring cleanup. + * + * xhci_stop_endpoint_sync() is intended to be utilized by clients that manage + * their own transfer ring, such as offload situations. + */ +int xhci_stop_endpoint_sync(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, int suspend, + gfp_t gfp_flags) +{ + struct xhci_command *command; + unsigned long flags; + int ret; + + command = xhci_alloc_command(xhci, true, gfp_flags); + if (!command) + return -ENOMEM; + + spin_lock_irqsave(&xhci->lock, flags); + ret = xhci_queue_stop_endpoint(xhci, command, ep->vdev->slot_id, + ep->ep_index, suspend); + if (ret < 0) { + spin_unlock_irqrestore(&xhci->lock, flags); + goto out; + } + + xhci_ring_cmd_db(xhci); + spin_unlock_irqrestore(&xhci->lock, flags); + + wait_for_completion(command->completion); + + /* No handling for COMP_CONTEXT_STATE_ERROR done at command completion*/ + if (command->status == COMP_COMMAND_ABORTED || + command->status == COMP_COMMAND_RING_STOPPED) { + xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n"); + ret = -ETIME; + } +out: + xhci_free_command(xhci, command); + + return ret; +} +EXPORT_SYMBOL_GPL(xhci_stop_endpoint_sync); /* Issue a configure endpoint command or evaluate context command * and wait for it to finish. diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 324644165d93..51a992d8ffcf 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1917,6 +1917,8 @@ void xhci_ring_doorbell_for_active_rings(struct xhci_hcd *xhci, void xhci_cleanup_command_queue(struct xhci_hcd *xhci); void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring); unsigned int count_trbs(u64 addr, u64 len); +int xhci_stop_endpoint_sync(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, + int suspend, gfp_t gfp_flags); /* xHCI roothub code */ void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,