From: Sourabh Jain <sourabhjain@linux.ibm.com>
To: mpe@ellerman.id.au
Cc: mahesh@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
Sourabh Jain <sourabhjain@linux.ibm.com>,
hbathini@linux.ibm.com
Subject: [PATCH] powerpc/fadump: sysfs for fadump memory reservation
Date: Tue, 6 Aug 2019 08:42:42 +0530 [thread overview]
Message-ID: <20190806031242.30749-1-sourabhjain@linux.ibm.com> (raw)
Add a sys interface to allow querying the memory reserved by fadump
for saving the crash dump.
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
Documentation/powerpc/firmware-assisted-dump.rst | 5 +++++
arch/powerpc/kernel/fadump.c | 14 ++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/Documentation/powerpc/firmware-assisted-dump.rst b/Documentation/powerpc/firmware-assisted-dump.rst
index 9ca12830a48e..4a7f6dc556f5 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..70d49013ebec 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
next reply other threads:[~2019-08-06 3:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-06 3:12 Sourabh Jain [this message]
2019-08-06 10:56 ` [PATCH] powerpc/fadump: sysfs for fadump memory reservation Mahesh Jagannath Salgaonkar
2019-08-07 3:10 ` Michael Ellerman
2019-08-08 5:43 ` Sourabh Jain
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=20190806031242.30749-1-sourabhjain@linux.ibm.com \
--to=sourabhjain@linux.ibm.com \
--cc=hbathini@linux.ibm.com \
--cc=linuxppc-dev@lists.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).