From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76B57C433EF for ; Mon, 20 Sep 2021 18:45:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 62BD1611AF for ; Mon, 20 Sep 2021 18:45:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354084AbhITSrN (ORCPT ); Mon, 20 Sep 2021 14:47:13 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:26390 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349414AbhITSnl (ORCPT ); Mon, 20 Sep 2021 14:43:41 -0400 Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 18KHT7Jt012980; Mon, 20 Sep 2021 14:41:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=a9ufpbxwEB93Rn+evVK2qSH25LhjJC8Oxp/tJUbJp5A=; b=lPwL+tWm12iM21ZhKZWS0738Sbd8trqqbfA2qsJYdLr4QTroxVVpXvbL3Q1VhwTll9Bc 8J6BkFQt/Ps4/nIxQTIBxACxXpHzV1so7NmIytK9lzkmfX3C8PkpSK9S0bHf0IuwlKbb Z0HDr0kKBiM59qkSG230aklulGwT+rGQG374M+ShZc4pL607ot0OIwYhaI5GfLZSRhpy yFQwhNcEnEkuqBGM101QqNpAPf7PMYB7i7lm6bP8BfTqb8BjjOBpgVkvS1Z2zwSGmUa3 VjC7G3CFXejo3DSwgT/IgnJGMfB8w7IZYvSnwvHvuOLQE4h4V7on3uwvA2CEaS8V6uQg zw== Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0a-001b2d01.pphosted.com with ESMTP id 3b5w3g3asf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Sep 2021 14:41:50 -0400 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 18KIb7vY012356; Mon, 20 Sep 2021 18:41:49 GMT Received: from b01cxnp23034.gho.pok.ibm.com (b01cxnp23034.gho.pok.ibm.com [9.57.198.29]) by ppma03dal.us.ibm.com with ESMTP id 3b57ra7qsb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Sep 2021 18:41:49 +0000 Received: from b01ledav002.gho.pok.ibm.com (b01ledav002.gho.pok.ibm.com [9.57.199.107]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 18KIfmXB23790018 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 20 Sep 2021 18:41:48 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8514E12405C; Mon, 20 Sep 2021 18:41:48 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 28751124054; Mon, 20 Sep 2021 18:41:47 +0000 (GMT) Received: from v0005c16.aus.stglabs.ibm.com (unknown [9.211.87.144]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 20 Sep 2021 18:41:46 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, jk@ozlabs.org, joel@jms.id.au, alistair@popple.id.au, linux@roeck-us.net, jdelvare@suse.com, eajames@linux.ibm.com Subject: [PATCH v2 3/3] hwmon: (occ) Provide the SBEFIFO FFDC in binary sysfs Date: Mon, 20 Sep 2021 13:41:41 -0500 Message-Id: <20210920184141.21358-4-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210920184141.21358-1-eajames@linux.ibm.com> References: <20210920184141.21358-1-eajames@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: nvoHkBTVQorBoBWdQaKi26XSQ-NLmFya X-Proofpoint-GUID: nvoHkBTVQorBoBWdQaKi26XSQ-NLmFya X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-20_07,2021-09-20_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 mlxscore=0 bulkscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 malwarescore=0 priorityscore=1501 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109200109 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Save any FFDC provided by the OCC driver, and provide it to userspace through a binary sysfs entry. Notify userspace pollers when there is an error too. Signed-off-by: Eddie James --- Changes since v1: - Remove "collected" error state in favor of a boolean - Clear the error flag once the FFDC has been completely read once - Only store FFDC if there is no FFDC waiting to be retrieved drivers/hwmon/occ/p9_sbe.c | 86 +++++++++++++++++++++++++++++++++++++- 1 file changed, 85 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c index 9709f2b9c052..e50243580269 100644 --- a/drivers/hwmon/occ/p9_sbe.c +++ b/drivers/hwmon/occ/p9_sbe.c @@ -4,18 +4,79 @@ #include #include #include +#include #include +#include #include +#include +#include #include "common.h" struct p9_sbe_occ { struct occ occ; + bool sbe_error; + void *ffdc; + size_t ffdc_len; + size_t ffdc_size; + struct mutex sbe_error_lock; /* lock access to ffdc data */ struct device *sbe; }; #define to_p9_sbe_occ(x) container_of((x), struct p9_sbe_occ, occ) +static ssize_t ffdc_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *battr, char *buf, loff_t pos, + size_t count) +{ + ssize_t rc = 0; + struct occ *occ = dev_get_drvdata(kobj_to_dev(kobj)); + struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ); + + mutex_lock(&ctx->sbe_error_lock); + if (ctx->sbe_error) { + rc = memory_read_from_buffer(buf, count, &pos, ctx->ffdc, + ctx->ffdc_len); + if (pos >= ctx->ffdc_len) + ctx->sbe_error = false; + } + mutex_unlock(&ctx->sbe_error_lock); + + return rc; +} +static BIN_ATTR_RO(ffdc, OCC_MAX_RESP_WORDS * 4); + +static bool p9_sbe_occ_save_ffdc(struct p9_sbe_occ *ctx, const void *resp, + size_t resp_len) +{ + bool notify = false; + + mutex_lock(&ctx->sbe_error_lock); + if (!ctx->sbe_error) { + if (resp_len > ctx->ffdc_size) { + if (ctx->ffdc) + kvfree(ctx->ffdc); + ctx->ffdc = kvmalloc(resp_len, GFP_KERNEL); + if (!ctx->ffdc) { + ctx->ffdc_len = 0; + ctx->ffdc_size = 0; + goto done; + } + + ctx->ffdc_size = resp_len; + } + + notify = true; + ctx->sbe_error = true; + ctx->ffdc_len = resp_len; + memcpy(ctx->ffdc, resp, resp_len); + } + +done: + mutex_unlock(&ctx->sbe_error_lock); + return notify; +} + static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len) { struct occ_response *resp = &occ->resp; @@ -24,8 +85,15 @@ static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len) int rc; rc = fsi_occ_submit(ctx->sbe, cmd, len, resp, &resp_len); - if (rc < 0) + if (rc < 0) { + if (resp_len) { + if (p9_sbe_occ_save_ffdc(ctx, resp, resp_len)) + sysfs_notify(&occ->bus_dev->kobj, NULL, + bin_attr_ffdc.attr.name); + } + return rc; + } switch (resp->return_status) { case OCC_RESP_CMD_IN_PRG: @@ -65,6 +133,8 @@ static int p9_sbe_occ_probe(struct platform_device *pdev) if (!ctx) return -ENOMEM; + mutex_init(&ctx->sbe_error_lock); + ctx->sbe = pdev->dev.parent; occ = &ctx->occ; occ->bus_dev = &pdev->dev; @@ -78,6 +148,15 @@ static int p9_sbe_occ_probe(struct platform_device *pdev) if (rc == -ESHUTDOWN) rc = -ENODEV; /* Host is shutdown, don't spew errors */ + if (!rc) { + rc = device_create_bin_file(occ->bus_dev, &bin_attr_ffdc); + if (rc) { + dev_warn(occ->bus_dev, + "failed to create SBE error ffdc file\n"); + rc = 0; + } + } + return rc; } @@ -86,9 +165,14 @@ static int p9_sbe_occ_remove(struct platform_device *pdev) struct occ *occ = platform_get_drvdata(pdev); struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ); + device_remove_bin_file(occ->bus_dev, &bin_attr_ffdc); + ctx->sbe = NULL; occ_shutdown(occ); + if (ctx->ffdc) + kvfree(ctx->ffdc); + return 0; } -- 2.27.0