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authorHari Bathini <hbathini@linux.ibm.com>2019-09-11 20:26:45 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2019-09-14 00:04:45 +1000
commit845426f3f3443c3f60737751b7af0142e3020f08 (patch)
treec448628f0759ff05f7091554b4f0a06107af7c87 /arch/powerpc/platforms
parent6f713d18144ce86c9f01cdf64222d6339e26129e (diff)
powerpc/opalcore: provide an option to invalidate /sys/firmware/opal/core file
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> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821380161.5656.17827032108471421830.stgit@hbathini.in.ibm.com
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r--arch/powerpc/platforms/powernv/opal-core.c38
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);