From patchwork Mon Nov 20 10:15:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kang Yang X-Patchwork-Id: 13461005 X-Patchwork-Delegate: kvalo@adurom.com 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 4054EC54FB9 for ; Mon, 20 Nov 2023 10:16:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232925AbjKTKQO (ORCPT ); Mon, 20 Nov 2023 05:16:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47336 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232305AbjKTKQN (ORCPT ); Mon, 20 Nov 2023 05:16:13 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A6779F for ; Mon, 20 Nov 2023 02:16:09 -0800 (PST) Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3AK4txZC031861; Mon, 20 Nov 2023 10:16:01 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-transfer-encoding : content-type; s=qcppdkim1; bh=LlzzVY+H2eDLFJ0u7BTyMgXFnPHboxmbKfaczKcZOBI=; b=SVrD0gbNnipebrH8GX9joN5yQJEj+n2C5eZ4hTHKRskT9PnQMAmiFMr9n+eRWozG4lvk aN4SWTd50nH6hH4nus07cNYQZmrA5igktN4dXLyNAU1vxvT1/3nerPJyYqAqosXhr3wR FV/7cdWMJhGDbsVVZVk+rmYqcTzYWNsbCIC6bkJl5aV4sUwu+LM5iVsySCh5P5XYQcYN mO4hzClezWrg9GDMihKVC4gMza4mienCx4lJr/Obx0KZYbheeYJCL6wj8xp1BUVFsBbS 1xlsE3ZiHCnoGhFLuhLpQG5Hs0AeBn2A3sXh8dxxActNSHTLV/GR2F2MAJ2uPFIK94VL Rg== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3uem80kqrk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Nov 2023 10:16:00 +0000 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 3AKAG0aP019598 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Nov 2023 10:16:00 GMT Received: from yk-E5440.qca.qualcomm.com (10.80.80.8) 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; Mon, 20 Nov 2023 02:15:58 -0800 From: Kang Yang To: CC: , Subject: [PATCH 1/7] wifi: ath12k: get msi_data again after request_irq is called Date: Mon, 20 Nov 2023 18:15:37 +0800 Message-ID: <20231120101543.4369-2-quic_kangyang@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231120101543.4369-1-quic_kangyang@quicinc.com> References: <20231120101543.4369-1-quic_kangyang@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) 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: GqYIuQ6PdIrKtw7qUNZVwfQraX_8Aa8O X-Proofpoint-ORIG-GUID: GqYIuQ6PdIrKtw7qUNZVwfQraX_8Aa8O X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-20_07,2023-11-17_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxlogscore=937 adultscore=0 priorityscore=1501 phishscore=0 malwarescore=0 impostorscore=0 lowpriorityscore=0 mlxscore=0 spamscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311200069 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The reservation mode of interrupts in kernel assigns a dummy vector when the interrupt is allocated and assigns a real vector when the request_irq is called. The reservation mode helps to ease vector pressure when devices with a large amount of queues/interrupts are initialized, but only a minimal subset of those queues/interrupts is actually used. So on reservation mode, the msi_data may change after request_irq is called, then it will lead to spurious interrupt. But when VT-d in BIOS is enabled and ath12k can get 32 MSI vectors, ath12k always get the same msi_data before and after request_irq. So in case of one MSI vector, ath12k need read msi_data again after request_irq is called, and then the correct msi_data is programmed into WCN7850 hardware components. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 Signed-off-by: Kang Yang Acked-by: Jeff Johnson --- drivers/net/wireless/ath/ath12k/pci.c | 30 +++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c index 3006cd3fbe11..c5bc9afaa9fc 100644 --- a/drivers/net/wireless/ath/ath12k/pci.c +++ b/drivers/net/wireless/ath/ath12k/pci.c @@ -708,6 +708,25 @@ static void ath12k_pci_msi_free(struct ath12k_pci *ab_pci) pci_free_irq_vectors(ab_pci->pdev); } +static int ath12k_pci_config_msi_data(struct ath12k_pci *ab_pci) +{ + struct msi_desc *msi_desc; + + msi_desc = irq_get_msi_desc(ab_pci->pdev->irq); + if (!msi_desc) { + ath12k_err(ab_pci->ab, "msi_desc is NULL!\n"); + pci_free_irq_vectors(ab_pci->pdev); + return -EINVAL; + } + + ab_pci->msi_ep_base_data = msi_desc->msg.data; + + ath12k_dbg(ab_pci->ab, ATH12K_DBG_PCI, "pci after request_irq msi_ep_base_data %d\n", + ab_pci->msi_ep_base_data); + + return 0; +} + static int ath12k_pci_claim(struct ath12k_pci *ab_pci, struct pci_dev *pdev) { struct ath12k_base *ab = ab_pci->ab; @@ -1286,6 +1305,17 @@ static int ath12k_pci_probe(struct pci_dev *pdev, goto err_ce_free; } + /* kernel may allocate a dummy vector before request_irq and + * then allocate a real vector when request_irq is called. + * So get msi_data here again to avoid spurious interrupt + * as msi_data will configured to srngs. + */ + ret = ath12k_pci_config_msi_data(ab_pci); + if (ret) { + ath12k_err(ab, "failed to config msi_data: %d\n", ret); + goto err_free_irq; + } + ret = ath12k_core_init(ab); if (ret) { ath12k_err(ab, "failed to init core: %d\n", ret);