From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.7 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id EF9107D90F for ; Thu, 8 Aug 2019 10:08:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389842AbfHHKIp (ORCPT ); Thu, 8 Aug 2019 06:08:45 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:23788 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389801AbfHHKIp (ORCPT ); Thu, 8 Aug 2019 06:08:45 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x789vI9g126307 for ; Thu, 8 Aug 2019 06:08:44 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2u8f6v6j71-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 08 Aug 2019 06:08:44 -0400 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 8 Aug 2019 11:08:39 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x78A8bgT43712954 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 8 Aug 2019 10:08:37 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 28129A4051; Thu, 8 Aug 2019 10:08:37 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A847AA4040; Thu, 8 Aug 2019 10:08:35 +0000 (GMT) Received: from localhost.in.ibm.com (unknown [9.124.35.86]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 8 Aug 2019 10:08:35 +0000 (GMT) From: Sourabh Jain To: mpe@ellerman.id.au Cc: linuxppc-dev@lists.ozlabs.org, mahesh@linux.vnet.ibm.com, hbathini@linux.ibm.com, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, corbet@lwn.net, Sourabh Jain Subject: [PATCH v2] powerpc/fadump: sysfs for fadump memory reservation Date: Thu, 8 Aug 2019 15:38:33 +0530 X-Mailer: git-send-email 2.17.2 X-TM-AS-GCONF: 00 x-cbid: 19080810-4275-0000-0000-0000035692A0 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19080810-4276-0000-0000-00003868976C Message-Id: <20190808100833.30367-1-sourabhjain@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-08-08_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908080110 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Add a sys interface to allow querying the memory reserved by fadump for saving the crash dump. Add an ABI doc entry for new sysfs interface. - /sys/kernel/fadump_mem_reserved Signed-off-by: Sourabh Jain --- v1 -> v2: - Added ABI doc for new sysfs interface. --- Documentation/ABI/testing/sysfs-kernel-fadump | 6 ++++++ Documentation/powerpc/firmware-assisted-dump.rst | 5 +++++ arch/powerpc/kernel/fadump.c | 14 ++++++++++++++ 3 files changed, 25 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-kernel-fadump diff --git a/Documentation/ABI/testing/sysfs-kernel-fadump b/Documentation/ABI/testing/sysfs-kernel-fadump new file mode 100644 index 000000000000..003e2f025dcb --- /dev/null +++ b/Documentation/ABI/testing/sysfs-kernel-fadump @@ -0,0 +1,6 @@ +What: /sys/kernel/fadump_mem_reserved +Date: August 2019 +Contact: linuxppc-dev@lists.ozlabs.org +Description: read only + Provide information about the amount of memory + reserved by fadump to saving the crash dump. diff --git a/Documentation/powerpc/firmware-assisted-dump.rst b/Documentation/powerpc/firmware-assisted-dump.rst index 9ca12830a48e..a5dfb20d4dc3 100644 --- a/Documentation/powerpc/firmware-assisted-dump.rst +++ b/Documentation/powerpc/firmware-assisted-dump.rst @@ -222,6 +222,11 @@ Here is the list of files under kernel sysfs: be handled and vmcore will not be captured. This interface can be easily integrated with kdump service start/stop. + /sys/kernel/fadump_mem_reserved + + This is used to display the memory reserved by fadump for saving the + crash dump. + /sys/kernel/fadump_release_mem This file is available only when fadump is active during second kernel. This is used to release the reserved memory diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 4eab97292cc2..cd373d1d4b82 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -1514,6 +1514,13 @@ static ssize_t fadump_enabled_show(struct kobject *kobj, return sprintf(buf, "%d\n", fw_dump.fadump_enabled); } +static ssize_t fadump_mem_reserved_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%ld\n", fw_dump.reserve_dump_area_size); +} + static ssize_t fadump_register_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -1632,6 +1639,9 @@ static struct kobj_attribute fadump_attr = __ATTR(fadump_enabled, static struct kobj_attribute fadump_register_attr = __ATTR(fadump_registered, 0644, fadump_register_show, fadump_register_store); +static struct kobj_attribute fadump_mem_reserved_attr = + __ATTR(fadump_mem_reserved, 0444, + fadump_mem_reserved_show, NULL); DEFINE_SHOW_ATTRIBUTE(fadump_region); @@ -1663,6 +1673,10 @@ static void fadump_init_files(void) printk(KERN_ERR "fadump: unable to create sysfs file" " fadump_release_mem (%d)\n", rc); } + rc = sysfs_create_file(kernel_kobj, &fadump_mem_reserved_attr.attr); + if (rc) + pr_err("unable to create sysfs file fadump_mem_reserved (%d)\n", + rc); return; } -- 2.17.2