From patchwork Tue May 7 19:50:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 13657737 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 04E0C15F3E6; Tue, 7 May 2024 19:51:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715111512; cv=none; b=O0c39+c7SR4DoNRiRroCIbLu3MwkOcGfY4DqoyKBZ6dY8yd4RsBpZ8ONvxrzWMfknXUBwoR6sOWfBxoywHFqJCVwflD0onnMov5JlQ4YoNUXAQz2h1ZL4mWIxvkFeNoItNJ+sIBwTFnimiBUtzeb40j6HY2gPG+10gCzcc007mw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715111512; c=relaxed/simple; bh=cUtHOLNf0R5GOdviTZVOeP6thiX8pbViVYJ0ZvcMhT0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=eFtyNJwfY5xwb2VtZ91SVkgurcnTZEt8+eOPAoLMOQdChDff4GrGEX+MsAv2J2G+AYIpxlMvbvLOlUocmcmAg6gqBuIjt78h6+IKyae7Bks4nBXsprF6ZhnkojDDPhjQjQcUSNXcFmk6S8aJbs2eNmLCIV74gSdpPmw51/0+D/s= 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=dWBiugIk; arc=none smtp.client-ip=205.220.180.131 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="dWBiugIk" Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 447IYYE6002322; Tue, 7 May 2024 19:51:30 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=db1DiRDPnPzv2WrnCumz 0mnCv8rXyp8CcEMm0K1v/Ns=; b=dWBiugIkvR5yPIoG8dDr7Y9/4uAR4Yx6Lg6D c7t4gU0SPnVBDDNMcoqPhK2OrhsSQDYyCcB/P0jOjmRBNo1F6gfprqmUWSg3XAjB TmcxdZSmwHOumqi1DD6SsJsWH5SAhbzZAw+3h5zDkoUu2V/eEX27JTtsOg7BEo19 cT0f8GCkVj/O6LeFZBPfxa/PZ+J3oJupOL4CBt9c1SqNtmzKpJNK/OwJshRs84EW J/izMoUB9ZIb1suf5CbREUcnhxVQos1L1nhcDhnoec/g7Dw5Jw7sblmEb26Ass3O +y7Phu/l4ioaXGv31o+rOepmmw05lrPPoYHvTnIx14qI+ZmpYw== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3xyspmr4e9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 May 2024 19:51:29 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 447JpSxL030389 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 7 May 2024 19:51:28 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, 7 May 2024 12:51:27 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v21 02/39] usb: host: xhci: Repurpose event handler for skipping interrupter events Date: Tue, 7 May 2024 12:50:39 -0700 Message-ID: <20240507195116.9464-3-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240507195116.9464-1-quic_wcheng@quicinc.com> References: <20240507195116.9464-1-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: 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-GUID: kSrRrQt1MN6EzfEF5TqWI80dVCldr4cK X-Proofpoint-ORIG-GUID: kSrRrQt1MN6EzfEF5TqWI80dVCldr4cK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-05-07_12,2024-05-06_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 phishscore=0 suspectscore=0 mlxscore=0 impostorscore=0 spamscore=0 adultscore=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 mlxlogscore=921 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405010000 definitions=main-2405070138 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..80dca780317a 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 reaquire 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 1c6126ed55b0..efbd1f651da4 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;