diff options
| author | Sourabh Jain <sourabhjain@linux.ibm.com> | 2019-12-11 21:39:10 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-02-19 22:46:07 +1100 |
| commit | d8e73458f33a24810413ee3a0cd020b644de2f98 (patch) | |
| tree | 488a517b3ba91bcc04fad8ceafba596619c579f9 | |
| parent | 3f5f1f22ef10ee0278cef1243944c93aca01b236 (diff) | |
powerpc/fadump: sysfs for fadump memory reservation
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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191211160910.21656-7-sourabhjain@linux.ibm.com
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-fadump | 7 | ||||
| -rw-r--r-- | Documentation/powerpc/firmware-assisted-dump.rst | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/fadump.c | 9 |
3 files changed, 21 insertions, 0 deletions
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 2cd65a0df9b8..b3f3ee135dbe 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 1182ae44ef14..265b4aa72252 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -1369,6 +1369,13 @@ 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) @@ -1433,10 +1440,12 @@ static int fadump_region_show(struct seq_file *m, void *private) 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, }; |