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nvme: enable to inject errors into admin commands 

This enables to inject errors into the commands submitted to the admin
queue.

It is useful to test error handling in the controller initialization.

	# echo 100 > /sys/kernel/debug/nvme0/fault_inject/probability
	# echo 1 > /sys/kernel/debug/nvme0/fault_inject/times
	# echo 10 > /sys/kernel/debug/nvme0/fault_inject/space
	# nvme reset /dev/nvme0
	# dmesg
	...
	nvme nvme0: Could not set queue count (16385)
	nvme nvme0: IO queues not created

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Akinobu Mita 2019-06-09 23:17:01 +09:00 committed by Christoph Hellwig
parent a3646451ed
commit f79d5fda4e
3 changed files with 7 additions and 3 deletions
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3
drivers/nvme/host/core.c
View File

@ -3722,6 +3722,7 @@ EXPORT_SYMBOL_GPL(nvme_start_ctrl);
void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
{
nvme_fault_inject_fini(&ctrl->fault_inject);
dev_pm_qos_hide_latency_tolerance(ctrl->device);
cdev_device_del(&ctrl->cdev, ctrl->device);
}
@ -3817,6 +3818,8 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
dev_pm_qos_update_user_latency_tolerance(ctrl->device,
min(default_ps_max_latency_us, (unsigned long)S32_MAX));
nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device));
return 0;
out_free_name:
kfree_const(ctrl->device->kobj.name);

5
drivers/nvme/host/fault_inject.c
View File

@ -60,9 +60,6 @@ void nvme_should_fail(struct request *req)
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;
@ -70,6 +67,8 @@ void nvme_should_fail(struct request *req)
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)) {

2
drivers/nvme/host/nvme.h
View File

@ -256,6 +256,8 @@ struct nvme_ctrl {
struct page *discard_page;
unsigned long discard_page_busy;
struct nvme_fault_inject fault_inject;
};
enum nvme_iopolicy {