From patchwork Sat Sep 9 20:16:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mukesh Ojha X-Patchwork-Id: 13378364 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 DBD68EE57CD for ; Sat, 9 Sep 2023 20:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240568AbjIIUUE (ORCPT ); Sat, 9 Sep 2023 16:20:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241756AbjIIUUE (ORCPT ); Sat, 9 Sep 2023 16:20:04 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8395710FA; Sat, 9 Sep 2023 13:19:24 -0700 (PDT) Received: from pps.filterd (m0279867.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 389KHmVi027220; Sat, 9 Sep 2023 20:17:48 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=tz8rKdVo2TshdvaxQGBb5GEOXGLShJh7mmZE7uPCmnA=; b=mxq+eoUWuaQXcBsTguvLL6z8lTwUYy1VXhhXiNeoOet6HlxEsYiQaCndZ2pbhmnSzVTg Bveaf2gnj+zEOe6PiKaFgYM8aWGgDzYI2eFyyM3rkUBxvdYEBv9YqlN54ebCoLs8kj61 gEk3CKt04nnLpMjxaOgIAcdNJVa4bwssU+wLf1GStllLZYii5QiMw2d+ekdMH4r0ws7A +M5MJ06/9Y9eyY3yPnbAIxjP76OqDLMoWzFNPyam6vWufkdR00mHOAdLJ7d0OaOo3jYE quN/blYJPMn4RCFxRayhx3Kxe3hCwuN8C0JT+6bO8ZcSN4kXlDbS1VXwRMBUhLF8rGbC 8g== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3t0edmh6rg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 09 Sep 2023 20:17:48 +0000 Received: from nasanex01c.na.qualcomm.com (nasanex01c.na.qualcomm.com [10.45.79.139]) by NASANPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 389KHl6U019361 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 9 Sep 2023 20:17:47 GMT Received: from hu-mojha-hyd.qualcomm.com (10.80.80.8) by nasanex01c.na.qualcomm.com (10.45.79.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Sat, 9 Sep 2023 13:17:37 -0700 From: Mukesh Ojha To: , , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , Subject: [PATCH v5 07/17] soc: qcom: minidump: Add pending region registration Date: Sun, 10 Sep 2023 01:46:08 +0530 Message-ID: <1694290578-17733-8-git-send-email-quic_mojha@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1694290578-17733-1-git-send-email-quic_mojha@quicinc.com> References: <1694290578-17733-1-git-send-email-quic_mojha@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01c.na.qualcomm.com (10.45.79.139) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: l56D68ugrVebVB5QF2tdyoNpM9sVsFuj X-Proofpoint-GUID: l56D68ugrVebVB5QF2tdyoNpM9sVsFuj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-09_19,2023-09-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 priorityscore=1501 mlxlogscore=999 malwarescore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 phishscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309090187 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org Pending regions are those apss minidump regions which came for registration before minidump was initialized or ready to do register the region. We can add regions to pending region list and register all of them from apss minidump driver probe in one go. Signed-off-by: Mukesh Ojha --- drivers/soc/qcom/qcom_minidump.c | 140 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 130 insertions(+), 10 deletions(-) diff --git a/drivers/soc/qcom/qcom_minidump.c b/drivers/soc/qcom/qcom_minidump.c index 86f4d09a7b4e..4ce36f154e89 100644 --- a/drivers/soc/qcom/qcom_minidump.c +++ b/drivers/soc/qcom/qcom_minidump.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -63,6 +64,33 @@ struct minidump { struct mutex md_lock; }; +/** + * struct minidump_pregion - Minidump pending region + * @list : Pending region list pointer + * @region : APSS minidump client region + */ +struct minidump_pregion { + struct list_head list; + struct qcom_minidump_region region; +}; + +/** + * struct minidump_plist - Minidump pending region list + * @plist : List of pending region to be registered + * @pregion_cnt : Count of the pending region to be registered + */ +struct minidump_plist { + struct list_head plist; + int pregion_cnt; + struct mutex plock; +}; + +static struct minidump_plist md_plist = { + .plist = LIST_HEAD_INIT(md_plist.plist), + .pregion_cnt = 0, + .plock = __MUTEX_INITIALIZER(md_plist.plock), +}; + /* * In some of the Old Qualcomm devices, boot firmware statically allocates 300 * as total number of supported region (including all co-processors) in @@ -336,6 +364,26 @@ static bool qcom_minidump_valid_region(const struct qcom_minidump_region *region IS_ALIGNED(region->size, 4); } +static struct minidump_pregion * +check_region_in_plist(const struct qcom_minidump_region *region) +{ + struct minidump_pregion *md_pregion; + struct minidump_pregion *tmp; + bool found = false; + + list_for_each_entry_safe(md_pregion, tmp, &md_plist.plist, list) { + struct qcom_minidump_region *md_region; + + md_region = &md_pregion->region; + if (!strcmp(md_region->name, region->name)) { + found = true; + break; + } + } + + return found ? md_pregion : NULL; +} + /** * qcom_minidump_region_register() - Register region in APSS Minidump table. * @region: minidump region. @@ -344,16 +392,44 @@ static bool qcom_minidump_valid_region(const struct qcom_minidump_region *region */ int qcom_minidump_region_register(const struct qcom_minidump_region *region) { + struct minidump_pregion *md_pregion; struct minidump *md; - int ret; - - md = qcom_smem_minidump_ready(); - if (!md) - return -EPROBE_DEFER; + int ret = 0; if (!qcom_minidump_valid_region(region)) return -EINVAL; + mutex_lock(&md_plist.plock); + md = qcom_smem_minidump_ready(); + if (!md) { + if (md_plist.pregion_cnt >= MAX_NUM_ENTRIES - 1) { + pr_err("maximum region limit %u reached\n", md_plist.pregion_cnt); + ret = -ENOSPC; + goto unlock_plock; + } + + md_pregion = check_region_in_plist(region); + if (md_pregion) { + pr_info("%s region is already exist\n", region->name); + ret = -EEXIST; + goto unlock_plock; + } + /* + * Maintain a list of client regions which came before + * minidump driver was ready and once it is ready, + * register them in one go from minidump probe function. + */ + md_pregion = kzalloc(sizeof(*md_pregion), GFP_KERNEL); + if (!md_pregion) { + ret = -ENOMEM; + goto unlock_plock; + } + md_pregion->region = *region; + list_add_tail(&md_pregion->list, &md_plist.plist); + md_plist.pregion_cnt++; + goto unlock_plock; + } + mutex_lock(&md->md_lock); ret = qcom_md_region_register(md, region); if (ret) @@ -362,6 +438,10 @@ int qcom_minidump_region_register(const struct qcom_minidump_region *region) qcom_md_update_elfheader(md, region); unlock: mutex_unlock(&md->md_lock); + return 0; + +unlock_plock: + mutex_unlock(&md_plist.plock); return ret; } EXPORT_SYMBOL_GPL(qcom_minidump_region_register); @@ -374,16 +454,28 @@ EXPORT_SYMBOL_GPL(qcom_minidump_region_register); */ int qcom_minidump_region_unregister(const struct qcom_minidump_region *region) { + struct minidump_pregion *md_pregion; struct minidump *md; - int ret; - - md = qcom_smem_minidump_ready(); - if (!md) - return -EPROBE_DEFER; + int ret = 0; if (!qcom_minidump_valid_region(region)) return -EINVAL; + mutex_lock(&md_plist.plock); + md = qcom_smem_minidump_ready(); + if (!md) { + md_pregion = check_region_in_plist(region); + if (!md_pregion) { + ret = -ENOENT; + goto unlock_plock; + } + + list_del(&md_pregion->list); + kfree(md_pregion); + md_plist.pregion_cnt--; + goto unlock_plock; + } + mutex_lock(&md->md_lock); ret = qcom_md_region_unregister(md, region); if (ret) @@ -393,6 +485,10 @@ int qcom_minidump_region_unregister(const struct qcom_minidump_region *region) unlock: mutex_unlock(&md->md_lock); return ret; + +unlock_plock: + mutex_unlock(&md_plist.plock); + return ret; } EXPORT_SYMBOL_GPL(qcom_minidump_region_unregister); @@ -532,6 +628,27 @@ static int qcom_apss_md_table_init(struct minidump *md, return 0; } +void qcom_apss_register_pending_regions(struct minidump *md) +{ + struct minidump_ss_data *mdss_data = md->apss_data; + struct minidump_pregion *md_pregion; + struct minidump_pregion *tmp; + + list_for_each_entry_safe(md_pregion, tmp, &md_plist.plist, list) { + struct qcom_minidump_region *region; + + region = &md_pregion->region; + mutex_lock(&md->md_lock); + qcom_md_add_region(mdss_data, region); + qcom_md_update_elfheader(md, region); + mutex_unlock(&md->md_lock); + + list_del(&md_pregion->list); + kfree(md_pregion); + md_plist.pregion_cnt--; + } +} + static int qcom_apss_minidump_probe(struct platform_device *pdev) { struct minidump_global_toc *mdgtoc; @@ -571,7 +688,10 @@ static int qcom_apss_minidump_probe(struct platform_device *pdev) return ret; } + mutex_lock(&md_plist.plock); platform_set_drvdata(pdev, md); + qcom_apss_register_pending_regions(md); + mutex_unlock(&md_plist.plock); return ret; }