From patchwork Tue Oct 15 21:28:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 835726 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 E615C1FF020; Tue, 15 Oct 2024 21:29:53 +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=1729027795; cv=none; b=MX4D5MsuLuAqDsmsoIiu8KfdtMlUwMkMtbsUajZDl5eWNHiOg7dgF4e0xRzrGUebRrRD3o3hfpSvGyuNDb8lZa3h1UC9PKIpDCiXoHGKdzawjud1N1WH+WTU+nKlWz/r027RUnGy7K3zCjfPrc+eIC33GXT/E2GQK5dHtWjV+Pk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729027795; c=relaxed/simple; bh=2azGS4Mn0hl3bJLIVZjYNoRlE2MsVGBfb5n8aG0ud74=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Y1cvMs1a9GFxRnP8xA4CWJilbr4TzNnlCmkj/uLTV2sal8/PcpDonWeCee0LtU4w+ocXpIsZgVbp6EjiGinjlefGcYXmb3yMoUxafY12XjK8O2yrIQUBTdPOSaXBZMMqaSjSF9bEkVBd7SCnwSjvLBh2rcZfDw78oRNTdXjY0GE= 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=VKGBFrTw; 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="VKGBFrTw" 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 49FJG82n003634; Tue, 15 Oct 2024 21:29:29 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= 8pUtfboEtVwzj3gvJFEJdvS9Fn04qc2yCNOn552kLBs=; b=VKGBFrTwEMeZEZNV wNPw0MOUr20Xy2mZQX1ZA67V78NkyCR68MyCzxVyq6lRilu2P7P2zmVea/AYp1DF aecVcgYp5j4ASWeS8GNAJAemkkErY+UMFz4c4zWKaFT2un+tkEWt1kUG89C3kEiR W7o6TXhzCYf5idhU0qC+J+n15xeXvg3xv3IIJNYMrAfCOIuTeYwG92+vjYxY02j3 ltzEMajGusM6t5Amd0UDraSdshVmc5dGD8x5pgjpjExFgZMeGVSUqeIhfjXyhor2 AhQLXIK7UeodjZ1u+pPm5bQ2FQUBSfMmzGuPXHzQIkdmseEgoik9k2Vfzo0whBqh BTcSew== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 429xdb8a2g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 15 Oct 2024 21:29:28 +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 49FLTRWL026390 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 15 Oct 2024 21:29:28 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, 15 Oct 2024 14:29:27 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , , , , Wesley Cheng Subject: [PATCH v29 03/33] usb: host: xhci: Repurpose event handler for skipping interrupter events Date: Tue, 15 Oct 2024 14:28:45 -0700 Message-ID: <20241015212915.1206789-4-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241015212915.1206789-1-quic_wcheng@quicinc.com> References: <20241015212915.1206789-1-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: CYwzxnLAF86VcLP-4puC6RHVMlXjokcH X-Proofpoint-GUID: CYwzxnLAF86VcLP-4puC6RHVMlXjokcH 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 spamscore=0 priorityscore=1501 lowpriorityscore=0 mlxlogscore=929 impostorscore=0 phishscore=0 clxscore=1015 adultscore=0 mlxscore=0 malwarescore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410150143 Depending on the interrupter use case, the OS may only be used to handle the interrupter event ring clean up. In these scenarios, event TRBs don't need to be handled by the OS, so introduce an xhci interrupter flag to tag if the events from an interrupter needs to be handled or not. Signed-off-by: Wesley Cheng --- drivers/usb/host/xhci-ring.c | 17 +++++++++++++---- drivers/usb/host/xhci.h | 1 + 2 files changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 9e90d2952760..74bdc94d863b 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2951,14 +2951,22 @@ static int handle_tx_event(struct xhci_hcd *xhci, } /* - * 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). + * This function handles one OS-owned event on the event ring, or ignores one event + * on interrupters which are non-OS owned. It may drop xhci->lock between event + * processing (e.g. to pass up port status changes). */ static int xhci_handle_event_trb(struct xhci_hcd *xhci, struct xhci_interrupter *ir, union xhci_trb *event) { u32 trb_type; + /* + * Some interrupters do not need to handle event TRBs, as they may be + * managed by another entity, but rely on the OS to clean up. + */ + if (ir->skip_events) + return 0; + trace_xhci_handle_event(ir->event_ring, &event->generic); /* @@ -3047,8 +3055,9 @@ 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. + * Handle all OS-owned events on an interrupter event ring, or skip pending events + * for non OS owned interrupter event ring. It may drop and reacquire xhci->lock + * between event processing. */ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir) { diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 51a992d8ffcf..a6fbfc11fb1d 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1430,6 +1430,7 @@ struct xhci_interrupter { struct xhci_intr_reg __iomem *ir_set; unsigned int intr_num; bool ip_autoclear; + bool skip_events; u32 isoc_bei_interval; /* For interrupter registers save and restore over suspend/resume */ u32 s3_irq_pending;