From patchwork Thu Feb 8 23:13:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 770944 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 BAD6351C3F; Thu, 8 Feb 2024 23:14:40 +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=1707434084; cv=none; b=Ny9cNfdEg9oc9OzTvuqTDx9eEs1dZ2as7/Ou8VXVx7QZPpsbTr3RTDinQHo2YskONhMJEAXjoTfEuP15owYUu8adiClqQ4pkAa7+79UlEIew8KQV1RdUVrF0XRPh7q6NwSoO45FU87cJT7blmqVr/ji6d9eA9mZ9hnfCm/F3b04= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707434084; c=relaxed/simple; bh=noUq46uIIl4c54Ml8nUqG/zmcTMdZmp/uQzsEWtdfvc=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JVilKygTAVuAwfjT26sFXRNC6mlJD4YITgA4YJfzI+9hlmcbUDlWyX35exj6aHPCqpOvxYBqkyf52s4cGD1zDUx+lWCREbZkQJ2jniV+Gh9fCpyZJZBdrMGHZq4b25ZpHf8BCJfo/AgqPK31EQdeKS6I2AjovUqTUcrICcxHQ7I= 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=RJkMzGjw; 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="RJkMzGjw" Received: from pps.filterd (m0279864.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 418MJO4H021321; Thu, 8 Feb 2024 23:14:20 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-type; s=qcppdkim1; bh=YEmwQFMFTsyU12bZ+DA3 QUirFGkywDIHtACo1YVzlzE=; b=RJkMzGjwFkBj/rqez8OKgz2SxZRALnqMcvow soxiggxZKe+RQjt13YexYCUTCwGysFMzI22VDi3wRpVnq+2G8GAMaHMHGX/13EOU EqGVXGIfKULg0huUaKuN0A+8K5VrE4EZdiLr8sRdRmCGc1BIr0t6FTCl3TpLHyV0 8yTfDRsrQla+YWW7L96zggFSnuOS0EvlnsuZx3ONvohBcFXY8NUbsWqmD0eDG/jG N2XLiL7c38chzJvNWf3CJTFZdd4TZc5jGMa3ZuVGus4z2R0TshXv2IhlG0Azijbp 1Mg/RxUo+hGeJYX+DD+2hvWlaWuT/GU9h+OILxggnHKnuFjmbA== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3w4h0ukb1p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 08 Feb 2024 23:14:19 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 418NEJ9B012210 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 8 Feb 2024 23:14:19 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 15.2.1118.40; Thu, 8 Feb 2024 15:14:18 -0800 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , , , Mathias Nyman , Wesley Cheng Subject: [PATCH v14 11/53] xhci: Decouple handling an event from checking for unhandled events Date: Thu, 8 Feb 2024 15:13:24 -0800 Message-ID: <20240208231406.27397-12-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240208231406.27397-1-quic_wcheng@quicinc.com> References: <20240208231406.27397-1-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: 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: Z9RkZonsmHQ_n7Xk2MMhib9GFMFc9VDx X-Proofpoint-GUID: Z9RkZonsmHQ_n7Xk2MMhib9GFMFc9VDx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-08_11,2024-02-08_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 spamscore=0 mlxscore=0 suspectscore=0 phishscore=0 malwarescore=0 bulkscore=0 mlxlogscore=744 priorityscore=1501 clxscore=1015 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2401310000 definitions=main-2402080131 From: Mathias Nyman Some sequences, will require traversing through the entire event ring without handling the event TRB. This is ideal for when secondary interrupters that are utilized by external entities need to clean up the interrupter's event rings during halting of the XHCI HCD. Signed-off-by: Mathias Nyman Signed-off-by: Wesley Cheng --- drivers/usb/host/xhci-ring.c | 38 ++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 19 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 293239d8fab0..6ef95f67970a 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2912,25 +2912,18 @@ static int handle_tx_event(struct xhci_hcd *xhci, } /* - * This function handles all OS-owned events on the event ring. It may drop + * This function handles one OS-owned event on the event ring. It may drop * xhci->lock between event processing (e.g. to pass up port status changes). - * Returns >0 for "possibly more events to process" (caller should call again), - * otherwise 0 if done. In future, <0 returns should indicate error code. */ -static int xhci_handle_event(struct xhci_hcd *xhci, struct xhci_interrupter *ir) +static int xhci_handle_event_trb(struct xhci_hcd *xhci, struct xhci_interrupter *ir, + union xhci_trb *event) { - union xhci_trb *event; u32 trb_type; - event = ir->event_ring->dequeue; - - if (!unhandled_event_trb(ir->event_ring)) - return 0; - trace_xhci_handle_event(ir->event_ring, &event->generic); /* - * Barrier between reading the TRB_CYCLE (valid) flag above and any + * Barrier between reading the TRB_CYCLE (valid) flag before, and any * speculative reads of the event's flags/data below. */ rmb(); @@ -2960,15 +2953,11 @@ static int xhci_handle_event(struct xhci_hcd *xhci, struct xhci_interrupter *ir) * to make sure a watchdog timer didn't mark the host as non-responsive. */ if (xhci->xhc_state & XHCI_STATE_DYING) { - xhci_dbg(xhci, "xHCI host dying, returning from " - "event handler.\n"); - return 0; + xhci_dbg(xhci, "xHCI host dying, returning from event handler.\n"); + return -ENODEV; } - /* Are there more items on the event ring? Caller will call us again to - * check. - */ - return 1; + return 0; } /* @@ -3018,9 +3007,14 @@ static void xhci_clear_interrupt_pending(struct xhci_hcd *xhci, } } +/* + * Handle all OS-owned events on an interrupter event ring. It may drop + * and reaquire xhci->lock between event processing. + */ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir) { int event_loop = 0; + int err; u64 temp; xhci_clear_interrupt_pending(xhci, ir); @@ -3041,7 +3035,10 @@ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir return -ENODEV; } - while (xhci_handle_event(xhci, ir) > 0) { + /* Process all OS owned event TRBs on this event ring */ + while (unhandled_event_trb(ir->event_ring)) { + err = xhci_handle_event_trb(xhci, ir, ir->event_ring->dequeue); + /* * If half a segment of events have been handled in one go then * update ERDP, and force isoc trbs to interrupt more often @@ -3057,6 +3054,9 @@ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir /* Update SW event ring dequeue pointer */ inc_deq(xhci, ir->event_ring); + + if (err) + break; } xhci_update_erst_dequeue(xhci, ir, true);