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powerpc/opalcore: provide an option to invalidate /sys/firmware/opal/core file

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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
This commit is contained in:
Hari Bathini 2019-09-11 20:26:45 +05:30 committed by Michael Ellerman
parent 6f713d1814
commit 845426f3f3
1 changed files with 38 additions and 0 deletions
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38
arch/powerpc/platforms/powernv/opal-core.c
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@ -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);