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nvme: expose cntlid in sysfs 

For NVMe over Fabrics, the cntlid will be used by systemd/udev to
create link to the device, for example,

/dev/disk/by-path/<fabrics-info>-<cntlid>-<namespace> -> /dev/nvme0n1

Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lin 2016-02-26 13:24:19 -08:00 committed by Jens Axboe
parent 1cb3cce5eb
commit 931e1c2204
2 changed files with 17 additions and 4 deletions
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20
drivers/nvme/host/core.c
View File

@ -912,6 +912,7 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
ctrl->oncs = le16_to_cpup(&id->oncs);
atomic_set(&ctrl->abort_limit, id->acl + 1);
ctrl->vwc = id->vwc;
ctrl->cntlid = le16_to_cpup(&id->cntlid);
memcpy(ctrl->serial, id->sn, sizeof(id->sn));
memcpy(ctrl->model, id->mn, sizeof(id->mn));
memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
@ -1099,7 +1100,7 @@ static const struct attribute_group nvme_ns_attr_group = {
.is_visible = nvme_attrs_are_visible,
};
#define nvme_show_function(field) \
#define nvme_show_str_function(field) \
static ssize_t field##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
@ -1108,15 +1109,26 @@ static ssize_t field##_show(struct device *dev, \
} \
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
nvme_show_function(model);
nvme_show_function(serial);
nvme_show_function(firmware_rev);
#define nvme_show_int_function(field) \
static ssize_t field##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
return sprintf(buf, "%d\n", ctrl->field); \
} \
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
nvme_show_str_function(model);
nvme_show_str_function(serial);
nvme_show_str_function(firmware_rev);
nvme_show_int_function(cntlid);
static struct attribute *nvme_dev_attrs[] = {
&dev_attr_reset_controller.attr,
&dev_attr_model.attr,
&dev_attr_serial.attr,
&dev_attr_firmware_rev.attr,
&dev_attr_cntlid.attr,
NULL
};

1
drivers/nvme/host/nvme.h
View File

@ -77,6 +77,7 @@ struct nvme_ctrl {
char serial[20];
char model[40];
char firmware_rev[8];
int cntlid;
u32 ctrl_config;