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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 9 Dec 2019 04:58:48 -0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xB94wkbh18153684 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 9 Dec 2019 04:58:46 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B0BE5A4051; Mon, 9 Dec 2019 04:58:46 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1C819A4040; Mon, 9 Dec 2019 04:58:45 +0000 (GMT) Received: from localhost.in.ibm.com (unknown [9.124.35.249]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 9 Dec 2019 04:58:44 +0000 (GMT) From: Sourabh Jain To: mpe@ellerman.id.au Cc: mahesh@linux.vnet.ibm.com, hbathini@linux.ibm.com, linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, corbet@lwn.net, linux-doc@vger.kernel.org, gregkh@linuxfoundation.org, Sourabh Jain Subject: [PATCH v5 6/6] powerpc/fadump: sysfs for fadump memory reservation Date: Mon, 9 Dec 2019 10:28:26 +0530 X-Mailer: git-send-email 2.17.2 In-Reply-To: <20191209045826.30076-1-sourabhjain@linux.ibm.com> References: <20191209045826.30076-1-sourabhjain@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19120904-0028-0000-0000-000003C6B563 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19120904-0029-0000-0000-00002489DF31 Message-Id: <20191209045826.30076-7-sourabhjain@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-09_01:2019-12-09,2019-12-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=1 mlxscore=0 malwarescore=0 clxscore=1015 bulkscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 spamscore=0 priorityscore=1501 mlxlogscore=985 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912090042 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a sys interface to allow querying the memory reserved by FADump for saving the crash dump. Also added Documentation/ABI for the new sysfs file. Signed-off-by: Sourabh Jain --- Documentation/ABI/testing/sysfs-kernel-fadump | 7 +++++++ Documentation/powerpc/firmware-assisted-dump.rst | 5 +++++ arch/powerpc/kernel/fadump.c | 9 +++++++++ 3 files changed, 21 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-kernel-fadump b/Documentation/ABI/testing/sysfs-kernel-fadump index 5d988b919e81..8f7a64a81783 100644 --- a/Documentation/ABI/testing/sysfs-kernel-fadump +++ b/Documentation/ABI/testing/sysfs-kernel-fadump @@ -31,3 +31,10 @@ Description: write only the system is booted to capture the vmcore using FADump. It is used to release the memory reserved by FADump to save the crash dump. + +What: /sys/kernel/fadump/mem_reserved +Date: Dec 2019 +Contact: linuxppc-dev@lists.ozlabs.org +Description: read only + Provide information about the amount of memory reserved by + FADump to save the crash dump in bytes. diff --git a/Documentation/powerpc/firmware-assisted-dump.rst b/Documentation/powerpc/firmware-assisted-dump.rst index 365c10209ef3..04993eaf3113 100644 --- a/Documentation/powerpc/firmware-assisted-dump.rst +++ b/Documentation/powerpc/firmware-assisted-dump.rst @@ -268,6 +268,11 @@ 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 35ecb51edc50..6f367e5b7970 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -1364,6 +1364,13 @@ static ssize_t enabled_show(struct kobject *kobj, return sprintf(buf, "%d\n", fw_dump.fadump_enabled); } +static ssize_t 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 registered_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -1431,10 +1438,12 @@ EXPORT_SYMBOL_GPL(fadump_kobj); static struct kobj_attribute release_attr = __ATTR_WO(release_mem); static struct kobj_attribute enable_attr = __ATTR_RO(enabled); static struct kobj_attribute register_attr = __ATTR_RW(registered); +static struct kobj_attribute mem_reserved_attr = __ATTR_RO(mem_reserved); static struct attribute *fadump_attrs[] = { &enable_attr.attr, ®ister_attr.attr, + &mem_reserved_attr.attr, NULL, }; -- 2.17.2