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// 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;
/*
* make sure this request is coming from a valid namespace
*/
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");
}
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);
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