@@ -15,6 +15,8 @@
#include <linux/proc_fs.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
#include <linux/slab.h>
#include <linux/crash_core.h>
#include <linux/of.h>
@@ -558,6 +560,36 @@ static void opalcore_cleanup(void)
}
__exitcall(opalcore_cleanup);
+static ssize_t fadump_release_opalcore_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ int input = -1;
+
+ if (kstrtoint(buf, 0, &input))
+ return -EINVAL;
+
+ if (input == 1) {
+ if (oc_conf == NULL) {
+ pr_err("'/sys/firmware/opal/core' file not accessible!\n");
+ return -EPERM;
+ }
+
+ /*
+ * Take away '/sys/firmware/opal/core' and release all memory
+ * used for exporting this file.
+ */
+ opalcore_cleanup();
+ } else
+ return -EINVAL;
+
+ return count;
+}
+
+static struct kobj_attribute opalcore_rel_attr = __ATTR(fadump_release_opalcore,
+ 0200, NULL,
+ fadump_release_opalcore_store);
+
/* Init function for opalcore module. */
static int __init opalcore_init(void)
{
@@ -590,6 +622,12 @@ static int __init opalcore_init(void)
return rc;
}
+ rc = sysfs_create_file(kernel_kobj, &opalcore_rel_attr.attr);
+ if (rc) {
+ pr_warn("unable to create sysfs file fadump_release_opalcore (%d)\n",
+ rc);
+ }
+
return 0;
}
fs_initcall(opalcore_init);
Writing '1' to /sys/kernel/fadump_release_opalcore would release the memory held by kernel in exporting /sys/firmware/opal/core file. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> --- arch/powerpc/platforms/powernv/opal-core.c | 38 ++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+)