diff options
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-core.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-core.c b/arch/powerpc/platforms/powernv/opal-core.c index 6fa6b8a6d510..ed895d82c048 100644 --- a/arch/powerpc/platforms/powernv/opal-core.c +++ b/arch/powerpc/platforms/powernv/opal-core.c @@ -13,6 +13,8 @@ #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> @@ -561,6 +563,36 @@ error_out: of_node_put(np); } +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); + static int __init opalcore_init(void) { int rc = -1; @@ -593,6 +625,12 @@ 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); |