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 v4 6/6] powerpc/fadump: sysfs for fadump memory reservation
Date: Fri, 6 Dec 2019 17:54:34 +0530 [thread overview]
Message-ID: <20191206122434.29587-7-sourabhjain@linux.ibm.com> (raw)
In-Reply-To: <20191206122434.29587-1-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 | 15 +++++++++++++++
3 files changed, 27 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 41a3cda81791..b2af51b7c750 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -1357,6 +1357,13 @@ 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)
@@ -1430,6 +1437,10 @@ static struct kobj_attribute enable_attr = __ATTR(enabled,
static struct kobj_attribute register_attr = __ATTR(registered,
0644, fadump_register_show,
fadump_register_store);
+static struct kobj_attribute mem_reserved_attr = __ATTR(mem_reserved,
+ 0444, fadump_mem_reserved_show,
+ NULL);
+
DEFINE_SHOW_ATTRIBUTE(fadump_region);
@@ -1464,6 +1475,10 @@ static void fadump_init_files(void)
pr_err("unable to create release_mem sysfs file (%d)\n",
rc);
}
+ rc = sysfs_create_file(fadump_kobj, &mem_reserved_attr.attr);
+ if (rc)
+ pr_err("unable to create mem_reserved sysfs file (%d)\n",
+ rc);
/* The FADump sysfs are moved from kernel_kobj to fadump_kobj need to
* create symlink at old location to maintain backward compatibility.
--
2.17.2
next prev parent reply other threads:[~2019-12-06 12:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-06 12:24 [PATCH v4 0/6] reorganize and add FADump sysfs files Sourabh Jain
2019-12-06 12:24 ` [PATCH v4 1/6] Documentation/ABI: add ABI documentation for /sys/kernel/fadump_* Sourabh Jain
2019-12-06 12:47 ` Greg KH
2019-12-06 12:24 ` [PATCH v4 2/6] sysfs: wrap __compat_only_sysfs_link_entry_to_kobj function to change the symlink name Sourabh Jain
2019-12-06 12:46 ` Greg KH
2019-12-06 18:27 ` Sourabh Jain
2019-12-06 19:14 ` Greg KH
2019-12-07 3:21 ` Sourabh Jain
2019-12-06 12:24 ` [PATCH v4 3/6] powerpc/fadump: reorganize /sys/kernel/fadump_* sysfs files Sourabh Jain
2019-12-06 12:45 ` Greg KH
2019-12-06 19:13 ` Sourabh Jain
2019-12-06 12:24 ` [PATCH v4 4/6] powerpc/powernv: move core and fadump_release_opalcore under new kobject Sourabh Jain
2019-12-06 12:48 ` Greg KH
2019-12-06 19:16 ` Sourabh Jain
2019-12-06 12:24 ` [PATCH v4 5/6] Documentation/ABI: mark /sys/kernel/fadump_* sysfs files deprecated Sourabh Jain
2019-12-06 12:24 ` Sourabh Jain [this message]
2019-12-06 12:48 ` [PATCH v4 6/6] powerpc/fadump: sysfs for fadump memory reservation Greg KH
2019-12-06 19:19 ` Sourabh Jain
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