linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Sourabh Jain <sourabhjain@linux.ibm.com>
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 <sourabhjain@linux.ibm.com>
Subject: [PATCH v5 6/6] powerpc/fadump: sysfs for fadump memory reservation
Date: Mon,  9 Dec 2019 10:28:26 +0530	[thread overview]
Message-ID: <20191209045826.30076-7-sourabhjain@linux.ibm.com> (raw)
In-Reply-To: <20191209045826.30076-1-sourabhjain@linux.ibm.com>

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 <sourabhjain@linux.ibm.com>
---
 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,
 	&register_attr.attr,
+	&mem_reserved_attr.attr,
 	NULL,
 };
 
-- 
2.17.2


      parent reply	other threads:[~2019-12-09  4:59 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09  4:58 [PATCH v5 0/6] reorganize and add FADump sysfs files Sourabh Jain
2019-12-09  4:58 ` [PATCH v5 1/6] Documentation/ABI: add ABI documentation for /sys/kernel/fadump_* Sourabh Jain
2019-12-09  4:58 ` [PATCH v5 2/6] sysfs: wrap __compat_only_sysfs_link_entry_to_kobj function to change the symlink name Sourabh Jain
2019-12-09  4:58 ` [PATCH v5 3/6] powerpc/fadump: reorganize /sys/kernel/fadump_* sysfs files Sourabh Jain
2019-12-09  8:10   ` Greg KH
2019-12-10  1:42     ` Sourabh Jain
2019-12-09  4:58 ` [PATCH v5 4/6] powerpc/powernv: move core and fadump_release_opalcore under new kobject Sourabh Jain
2019-12-09  4:58 ` [PATCH v5 5/6] Documentation/ABI: mark /sys/kernel/fadump_* sysfs files deprecated Sourabh Jain
2019-12-09  4:58 ` Sourabh Jain [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20191209045826.30076-7-sourabhjain@linux.ibm.com \
    --to=sourabhjain@linux.ibm.com \
    --cc=corbet@lwn.net \
    --cc=gregkh@linuxfoundation.org \
    --cc=hbathini@linux.ibm.com \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@ozlabs.org \
    --cc=mahesh@linux.vnet.ibm.com \
    --cc=mpe@ellerman.id.au \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).