powerpc/fadump: sysfs for fadump memory reservation (d8e73458) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-kernel-fadump

+7 −0

Original line number	Diff line number	Diff line
		@@ -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.

+5 −0

Original line number	Diff line number	Diff line
		@@ -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

+9 −0

Original line number	Diff line number	Diff line
		@@ -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,
		&register_attr.attr,
		&mem_reserved_attr.attr,
		NULL,
		};