From patchwork Sat Feb 17 00:09:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 13560996 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 7DC681C36; Sat, 17 Feb 2024 00:10:50 +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=1708128652; cv=none; b=Xw4MxgDOoWv2VR1+kwIbn580f/BnSTbunQltoWsgGJ69ahNsfr0/jmEo9qptfEEKR7kWvX21nanBiUfPdm9Bt2TM/dJZ76Rg+RixfBLtwl23+I38D1eV6m2cwhWgUQHOyRrDemf1X52PR8g5j0027ocdQEUvP01GVbCuWsXUcs0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708128652; c=relaxed/simple; bh=zR0MiJLCu3Slj0Xo8nwhAizKu0E/rCxCMd64N0Xy0RQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NbZ9IDDAUqqs+rUW26SfXnHfkGaowL+wNIPOHTaurmhf85CSye870zFtoOGj1XdMKgZ3K4Tvne+5JMdXEjDl3r3AoM4HQsoBep1M18dlZDuvNNixHTdlJDA/HrmEbJNSrTqswxb2xkM6ZSaU1Lebl/uiWEBEO5n9f0ynYaZBvqM= 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=MffmJikt; 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="MffmJikt" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 41GNQN3m005504; Sat, 17 Feb 2024 00:10:35 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=SqD97Far38NWycDJIWSe iiV0wKorK1dncOw/VpcPQ2Q=; b=MffmJiktDWQwn6Q5EpTUMUVjc0ljeAwR0TNg dUiIJ6alk6TyWpagvgnSXPMSSkXOUoTMl7CJqmNYvtbVnplon0cxJLX/xmKGShsZ 7K/DvLfBgFw8T1AYWyXqkzEdoCPc8vXVTly4sL2H3BjexQNat5PewNBqG4k4vq3f QGceXHiXN1P0G9+3uS5rs6fpd7UHZ54/fyUtPpF6hXLJa/g26nf1pHV70a3T/HtM DY2oHzVoSiayCSZn1aXUozwKbTXEJgNDs7tI358pRzsk29NtRpesxOw4FYP1QaHW gvAkBRP6xAR7ozohRFD0AJhE/Ow85pGGulKv7gU/xMrMZyB2vQ== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3w9wxf2cn4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 17 Feb 2024 00:10:35 +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 41H0AYRb017216 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 17 Feb 2024 00:10:34 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; Fri, 16 Feb 2024 16:10:34 -0800 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v17 16/51] usb: host: xhci-mem: Cleanup pending secondary event ring events Date: Fri, 16 Feb 2024 16:09:42 -0800 Message-ID: <20240217001017.29969-17-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240217001017.29969-1-quic_wcheng@quicinc.com> References: <20240217001017.29969-1-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: 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: WBb9qC85wvnx_bjje7LmcdqY4bX9Au84 X-Proofpoint-ORIG-GUID: WBb9qC85wvnx_bjje7LmcdqY4bX9Au84 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=2024-02-16_23,2024-02-16_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=923 lowpriorityscore=0 priorityscore=1501 mlxscore=0 clxscore=1015 impostorscore=0 suspectscore=0 phishscore=0 malwarescore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2401310000 definitions=main-2402160189 As part of xHCI bus suspend, the XHCI is halted. However, if there are pending events in the secondary event ring, it is observed that the xHCI controller stops responding to further commands upon host or device initiated bus resume. Iterate through all pending events and update the dequeue pointer to the beginning of the event ring. Signed-off-by: Wesley Cheng --- drivers/usb/host/xhci-mem.c | 7 ++++++- drivers/usb/host/xhci-ring.c | 33 ++++++++++++++++++++++++++++++++- drivers/usb/host/xhci.h | 5 +++++ 3 files changed, 43 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 450adaca68ee..e4c13f056c1a 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1827,7 +1827,7 @@ xhci_remove_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir) tmp &= ERST_SIZE_MASK; writel(tmp, &ir->ir_set->erst_size); - xhci_write_64(xhci, ERST_EHB, &ir->ir_set->erst_dequeue); + xhci_update_erst_dequeue(xhci, ir, true); } } @@ -1870,6 +1870,11 @@ void xhci_remove_secondary_interrupter(struct usb_hcd *hcd, struct xhci_interrup return; } + /* + * Cleanup secondary interrupter to ensure there are no pending events. + * This also updates event ring dequeue pointer back to the start. + */ + xhci_skip_sec_intr_events(xhci, ir->event_ring, ir); intr_num = ir->intr_num; xhci_remove_interrupter(xhci, ir); diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 82c10a5ac6e9..dd78662122ea 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3023,7 +3023,7 @@ static int xhci_handle_event_trb(struct xhci_hcd *xhci, struct xhci_interrupter * - When all events have finished * - To avoid "Event Ring Full Error" condition */ -static void xhci_update_erst_dequeue(struct xhci_hcd *xhci, +void xhci_update_erst_dequeue(struct xhci_hcd *xhci, struct xhci_interrupter *ir, bool clear_ehb) { @@ -3123,6 +3123,37 @@ static int xhci_handle_events(struct xhci_hcd *xhci, struct xhci_interrupter *ir return 0; } +/* + * Move the event ring dequeue pointer to skip events kept in the secondary + * event ring. This is used to ensure that pending events in the ring are + * acknowledged, so the XHCI HCD can properly enter suspend/resume. The + * secondary ring is typically maintained by an external component. + */ +void xhci_skip_sec_intr_events(struct xhci_hcd *xhci, + struct xhci_ring *ring, struct xhci_interrupter *ir) +{ + union xhci_trb *current_trb; + u64 erdp_reg; + dma_addr_t deq; + + /* disable irq, ack pending interrupt and ack all pending events */ + xhci_disable_interrupter(ir); + + /* last acked event trb is in erdp reg */ + erdp_reg = xhci_read_64(xhci, &ir->ir_set->erst_dequeue); + deq = (dma_addr_t)(erdp_reg & ERST_PTR_MASK); + if (!deq) { + xhci_err(xhci, "event ring handling not required\n"); + return; + } + + current_trb = ir->event_ring->dequeue; + /* read cycle state of the last acked trb to find out CCS */ + ring->cycle_state = le32_to_cpu(current_trb->event_cmd.flags) & TRB_CYCLE; + + xhci_handle_events(xhci, ir); +} + /* * xHCI spec says we can get an interrupt, and if the HC has an error condition, * we might get bad data out of the event ring. Section 4.10.2.7 has a list of diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 22aa9f2a2c0a..92ff1cf23556 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1840,6 +1840,8 @@ struct xhci_interrupter * xhci_create_secondary_interrupter(struct usb_hcd *hcd, int num_seg); void xhci_remove_secondary_interrupter(struct usb_hcd *hcd, struct xhci_interrupter *ir); +void xhci_skip_sec_intr_events(struct xhci_hcd *xhci, + struct xhci_ring *ring, struct xhci_interrupter *ir); /* xHCI host controller glue */ typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *); @@ -1931,6 +1933,9 @@ 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); +void xhci_update_erst_dequeue(struct xhci_hcd *xhci, + struct xhci_interrupter *ir, + bool clear_ehb); /* xHCI roothub code */ void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,