ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/nvme/host/fault_inject.c b/marvell/linux/drivers/nvme/host/fault_inject.c
new file mode 100644
index 0000000..1352159
--- /dev/null
+++ b/marvell/linux/drivers/nvme/host/fault_inject.c
@@ -0,0 +1,82 @@
+// 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);