From patchwork Tue Jul 25 02:33:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 13325541 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DCB5FC04FDF for ; Tue, 25 Jul 2023 02:35:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230365AbjGYCfO (ORCPT ); Mon, 24 Jul 2023 22:35:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230313AbjGYCfL (ORCPT ); Mon, 24 Jul 2023 22:35:11 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28109199F; Mon, 24 Jul 2023 19:35:05 -0700 (PDT) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 36P1JwDB008693; Tue, 25 Jul 2023 02:34:34 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=g3TCSR7drO55mwAZsoyGTQxZ/AyFry1A4DMX9Sz1JVM=; b=Y8BKZlFU/4J177nv2m351V9c4O/rnOrMsPeRgxHOe6K2odH8DMxn8fYWzbZJbiIK/IEf 3q5Ii+qJklKqj3odYlcfnf/Lwsc0gAjE2pRJ/bLRfA53FsQKY1CJKAsgrnA5WIDhJx9/ W6NUkvmcVPfynGqIhoxh1eZTJv+c0wz0VrRLMr6DBZ2ORA5Dz+hh5/bsrHDVaL1eWjbX tJCAVaMPgXUfS7ttV3kbihGg3LvF5hWWRz0aM59nqulp5chCyr6IswuxgAiEphVQERCA x6SvLVglo5b4JI3RUhU7bZbI5tGG3xg/yjL8+Ww4Zw/E9DASiiISrzOY9a5f1H41uj+Q Wg== Received: from nasanppmta03.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3s1qassvxp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 25 Jul 2023 02:34:34 +0000 Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 36P2YWin012109 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 25 Jul 2023 02:34:32 GMT Received: from hu-wcheng-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Mon, 24 Jul 2023 19:34:31 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , , , CC: , , , , , , , , , , , Wesley Cheng Subject: [PATCH v4 04/32] usb: host: xhci-mem: Cleanup pending secondary event ring events Date: Mon, 24 Jul 2023 19:33:48 -0700 Message-ID: <20230725023416.11205-5-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230725023416.11205-1-quic_wcheng@quicinc.com> References: <20230725023416.11205-1-quic_wcheng@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: Sem_0RP80LoFT_FARNTLjE2dfgJHcDIA X-Proofpoint-GUID: Sem_0RP80LoFT_FARNTLjE2dfgJHcDIA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-24_18,2023-07-24_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 impostorscore=0 mlxscore=0 mlxlogscore=734 adultscore=0 priorityscore=1501 clxscore=1015 spamscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2307250020 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org 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 updating the dequeue pointer to the last pending event trb. Signed-off-by: Wesley Cheng --- drivers/usb/host/xhci-mem.c | 74 ++++++++++++++++++++++++++++++++++--- 1 file changed, 69 insertions(+), 5 deletions(-) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index c51150af22f2..6b01d56c176f 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1799,17 +1799,85 @@ int xhci_alloc_erst(struct xhci_hcd *xhci, return 0; } +static void xhci_handle_sec_intr_events(struct xhci_hcd *xhci, + struct xhci_ring *ring, struct xhci_intr_reg __iomem *ir_set, + struct xhci_erst *erst) +{ + union xhci_trb *erdp_trb, *current_trb; + struct xhci_segment *seg; + u64 erdp_reg; + u32 iman_reg; + dma_addr_t deq; + unsigned long segment_offset; + + /* disable irq, ack pending interrupt and ack all pending events */ + iman_reg = readl_relaxed(&ir_set->irq_pending); + iman_reg &= ~IMAN_IE; + writel_relaxed(iman_reg, &ir_set->irq_pending); + iman_reg = readl_relaxed(&ir_set->irq_pending); + if (iman_reg & IMAN_IP) + writel_relaxed(iman_reg, &ir_set->irq_pending); + + /* last acked event trb is in erdp reg */ + erdp_reg = xhci_read_64(xhci, &ir_set->erst_dequeue); + deq = (dma_addr_t)(erdp_reg & ~ERST_PTR_MASK); + if (!deq) { + xhci_dbg(xhci, "event ring handling not required\n"); + return; + } + + seg = ring->first_seg; + segment_offset = deq - seg->dma; + + /* find out virtual address of the last acked event trb */ + erdp_trb = current_trb = &seg->trbs[0] + + (segment_offset/sizeof(*current_trb)); + + /* 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; + + while (1) { + /* last trb of the event ring: toggle cycle state */ + if (current_trb == &seg->trbs[TRBS_PER_SEGMENT - 1]) { + ring->cycle_state ^= 1; + current_trb = &seg->trbs[0]; + } else { + current_trb++; + } + + /* cycle state transition */ + if ((le32_to_cpu(current_trb->event_cmd.flags) & TRB_CYCLE) != + ring->cycle_state) + break; + } + + if (erdp_trb != current_trb) { + deq = xhci_trb_virt_to_dma(ring->deq_seg, current_trb); + if (deq == 0) + xhci_warn(xhci, + "WARN invalid SW event ring dequeue ptr.\n"); + /* Update HC event ring dequeue pointer */ + erdp_reg &= ERST_PTR_MASK; + erdp_reg |= ((u64) deq & (u64) ~ERST_PTR_MASK); + } + + /* Clear the event handler busy flag (RW1C); event ring is empty. */ + erdp_reg |= ERST_EHB; + xhci_write_64(xhci, erdp_reg, &ir_set->erst_dequeue); +} + static void xhci_free_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir) { struct device *dev = xhci_to_hcd(xhci)->self.sysdev; size_t erst_size; - u64 tmp64; u32 tmp; if (!ir) return; + xhci_handle_sec_intr_events(xhci, ir->event_ring, ir->ir_set, &ir->erst); + erst_size = sizeof(struct xhci_erst_entry) * ir->erst.num_entries; if (ir->erst.entries) dma_free_coherent(dev, erst_size, @@ -1826,10 +1894,6 @@ xhci_free_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir) tmp = readl(&ir->ir_set->erst_size); tmp &= ERST_SIZE_MASK; writel(tmp, &ir->ir_set->erst_size); - - tmp64 = xhci_read_64(xhci, &ir->ir_set->erst_dequeue); - tmp64 &= (u64) ERST_PTR_MASK; - xhci_write_64(xhci, tmp64, &ir->ir_set->erst_dequeue); } /* free interrrupter event ring */