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-rw-r--r--drivers/nvme/host/Makefile1
-rw-r--r--drivers/nvme/host/core.c2
-rw-r--r--drivers/nvme/host/fault_inject.c79
-rw-r--r--drivers/nvme/host/nvme.h27
4 files changed, 109 insertions, 0 deletions
diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile
index 441e67e3a9d7..aea459c65ae1 100644
--- a/drivers/nvme/host/Makefile
+++ b/drivers/nvme/host/Makefile
@@ -12,6 +12,7 @@ nvme-core-y := core.o
nvme-core-$(CONFIG_TRACING) += trace.o
nvme-core-$(CONFIG_NVME_MULTIPATH) += multipath.o
nvme-core-$(CONFIG_NVM) += lightnvm.o
+nvme-core-$(CONFIG_FAULT_INJECTION_DEBUG_FS) += fault_inject.o
nvme-y += pci.o
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 24fd90f5fbfb..f96b99356917 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3035,6 +3035,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
nvme_mpath_add_disk(ns->head);
nvme_mpath_add_disk_links(ns);
+ nvme_fault_inject_init(ns);
return;
out_unlink_ns:
mutex_lock(&ctrl->subsys->lock);
@@ -3053,6 +3054,7 @@ static void nvme_ns_remove(struct nvme_ns *ns)
if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
return;
+ nvme_fault_inject_fini(ns);
if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
nvme_mpath_remove_disk_links(ns);
sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
diff --git a/drivers/nvme/host/fault_inject.c b/drivers/nvme/host/fault_inject.c
new file mode 100644
index 000000000000..02632266ac06
--- /dev/null
+++ b/drivers/nvme/host/fault_inject.c
@@ -0,0 +1,79 @@
+/*
+ * 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_ns *ns)
+{
+ struct dentry *dir, *parent;
+ char *name = ns->disk->disk_name;
+ struct nvme_fault_inject *fault_inj = &ns->fault_inject;
+ 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(name, NULL);
+ if (!parent) {
+ pr_warn("%s: failed to create debugfs directory\n", 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", name);
+ debugfs_remove_recursive(parent);
+ return;
+ }
+ ns->fault_inject.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_ns *ns)
+{
+ /* remove debugfs directories */
+ debugfs_remove_recursive(ns->fault_inject.parent);
+}
+
+void nvme_should_fail(struct request *req)
+{
+ struct gendisk *disk = req->rq_disk;
+ struct nvme_ns *ns = NULL;
+ u16 status;
+
+ /*
+ * make sure this request is coming from a valid namespace
+ */
+ if (!disk)
+ return;
+
+ ns = disk->private_data;
+ if (ns && should_fail(&ns->fault_inject.attr, 1)) {
+ /* inject status code and DNR bit */
+ status = ns->fault_inject.status;
+ if (ns->fault_inject.dont_retry)
+ status |= NVME_SC_DNR;
+ nvme_req(req)->status = status;
+ }
+}
+EXPORT_SYMBOL_GPL(nvme_should_fail);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 0521e4707d1c..9a3d3540aa6a 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -21,6 +21,7 @@
#include <linux/blk-mq.h>
#include <linux/lightnvm.h>
#include <linux/sed-opal.h>
+#include <linux/fault-inject.h>
extern unsigned int nvme_io_timeout;
#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
@@ -261,6 +262,15 @@ struct nvme_ns_head {
int instance;
};
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+struct nvme_fault_inject {
+ struct fault_attr attr;
+ struct dentry *parent;
+ bool dont_retry; /* DNR, do not retry */
+ u16 status; /* status code */
+};
+#endif
+
struct nvme_ns {
struct list_head list;
@@ -282,6 +292,11 @@ struct nvme_ns {
#define NVME_NS_REMOVING 0
#define NVME_NS_DEAD 1
u16 noiob;
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+ struct nvme_fault_inject fault_inject;
+#endif
+
};
struct nvme_ctrl_ops {
@@ -300,6 +315,16 @@ struct nvme_ctrl_ops {
int (*reinit_request)(void *data, struct request *rq);
};
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+void nvme_fault_inject_init(struct nvme_ns *ns);
+void nvme_fault_inject_fini(struct nvme_ns *ns);
+void nvme_should_fail(struct request *req);
+#else
+static inline void nvme_fault_inject_init(struct nvme_ns *ns) {}
+static inline void nvme_fault_inject_fini(struct nvme_ns *ns) {}
+static inline void nvme_should_fail(struct request *req) {}
+#endif
+
static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
{
u32 val = 0;
@@ -336,6 +361,8 @@ static inline void nvme_end_request(struct request *req, __le16 status,
rq->status = le16_to_cpu(status) >> 1;
rq->result = result;
+ /* inject error when permitted by fault injection framework */
+ nvme_should_fail(req);
blk_mq_complete_request(req);
}