// SPDX-License-Identifier: GPL-2.0
|
/*
|
* fault injection support for nvme.
|
*
|
* Copyright (c) 2018, Oracle and/or its affiliates
|
*/
|
|
#include <linux/moduleparam.h>
|
#include "nvme.h"
|
|
static DECLARE_FAULT_ATTR(fail_default_attr);
|
/* optional fault injection attributes boot time option:
|
* nvme_core.fail_request=<interval>,<probability>,<space>,<times>
|
*/
|
static char *fail_request;
|
module_param(fail_request, charp, 0000);
|
|
void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
|
const char *dev_name)
|
{
|
struct dentry *dir, *parent;
|
struct fault_attr *attr = &fault_inj->attr;
|
|
/* set default fault injection attribute */
|
if (fail_request)
|
setup_fault_attr(&fail_default_attr, fail_request);
|
|
/* create debugfs directory and attribute */
|
parent = debugfs_create_dir(dev_name, NULL);
|
if (!parent) {
|
pr_warn("%s: failed to create debugfs directory\n", dev_name);
|
return;
|
}
|
|
*attr = fail_default_attr;
|
dir = fault_create_debugfs_attr("fault_inject", parent, attr);
|
if (IS_ERR(dir)) {
|
pr_warn("%s: failed to create debugfs attr\n", dev_name);
|
debugfs_remove_recursive(parent);
|
return;
|
}
|
fault_inj->parent = parent;
|
|
/* create debugfs for status code and dont_retry */
|
fault_inj->status = NVME_SC_INVALID_OPCODE;
|
fault_inj->dont_retry = true;
|
debugfs_create_x16("status", 0600, dir, &fault_inj->status);
|
debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry);
|
}
|
|
void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject)
|
{
|
/* remove debugfs directories */
|
debugfs_remove_recursive(fault_inject->parent);
|
}
|
|
void nvme_should_fail(struct request *req)
|
{
|
struct gendisk *disk = req->rq_disk;
|
struct nvme_fault_inject *fault_inject = NULL;
|
u16 status;
|
|
if (disk) {
|
struct nvme_ns *ns = disk->private_data;
|
|
if (ns)
|
fault_inject = &ns->fault_inject;
|
else
|
WARN_ONCE(1, "No namespace found for request\n");
|
} else {
|
fault_inject = &nvme_req(req)->ctrl->fault_inject;
|
}
|
|
if (fault_inject && should_fail(&fault_inject->attr, 1)) {
|
/* inject status code and DNR bit */
|
status = fault_inject->status;
|
if (fault_inject->dont_retry)
|
status |= NVME_SC_DNR;
|
nvme_req(req)->status = status;
|
}
|
}
|
EXPORT_SYMBOL_GPL(nvme_should_fail);
|
