Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * fault injection support for nvme.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (c) 2018, Oracle and/or its affiliates
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include "nvme.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) static DECLARE_FAULT_ATTR(fail_default_attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) /* optional fault injection attributes boot time option:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * nvme_core.fail_request=<interval>,<probability>,<space>,<times>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static char *fail_request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) module_param(fail_request, charp, 0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 			    const char *dev_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	struct dentry *dir, *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	struct fault_attr *attr = &fault_inj->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	/* set default fault injection attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	if (fail_request)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		setup_fault_attr(&fail_default_attr, fail_request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	/* create debugfs directory and attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	parent = debugfs_create_dir(dev_name, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	if (!parent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		pr_warn("%s: failed to create debugfs directory\n", dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	*attr = fail_default_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	dir = fault_create_debugfs_attr("fault_inject", parent, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (IS_ERR(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		pr_warn("%s: failed to create debugfs attr\n", dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		debugfs_remove_recursive(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	fault_inj->parent = parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	/* create debugfs for status code and dont_retry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	fault_inj->status = NVME_SC_INVALID_OPCODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	fault_inj->dont_retry = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	debugfs_create_x16("status", 0600, dir,	&fault_inj->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	/* remove debugfs directories */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	debugfs_remove_recursive(fault_inject->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) void nvme_should_fail(struct request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	struct gendisk *disk = req->rq_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	struct nvme_fault_inject *fault_inject = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	u16 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	if (disk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		struct nvme_ns *ns = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		if (ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 			fault_inject = &ns->fault_inject;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 			WARN_ONCE(1, "No namespace found for request\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		fault_inject = &nvme_req(req)->ctrl->fault_inject;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	if (fault_inject && should_fail(&fault_inject->attr, 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 		/* inject status code and DNR bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 		status = fault_inject->status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		if (fault_inject->dont_retry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 			status |= NVME_SC_DNR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 		nvme_req(req)->status =	status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) EXPORT_SYMBOL_GPL(nvme_should_fail);