nvme: expose cntrltype and dctype through sysfs

[mirror_ubuntu-jammy-kernel.git] / drivers / nvme / host / core.c

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3b7591d8ae5875b7e6ce3fa947ca4fe248df3d71..293ec5c01f080651641b1582598f29e1377392f7 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2933,6 +2933,9 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl)
        ctrl->max_namespaces = le32_to_cpu(id->mnan);
        ctrl->ctratt = le32_to_cpu(id->ctratt);
 
+       ctrl->cntrltype = id->cntrltype;
+       ctrl->dctype = id->dctype;
+
        if (id->rtd3e) {
                /* us -> s */
                u32 transition_time = le32_to_cpu(id->rtd3e) / USEC_PER_SEC;
@@ -3466,6 +3469,40 @@ static ssize_t nvme_ctrl_fast_io_fail_tmo_store(struct device *dev,
 static DEVICE_ATTR(fast_io_fail_tmo, S_IRUGO | S_IWUSR,
        nvme_ctrl_fast_io_fail_tmo_show, nvme_ctrl_fast_io_fail_tmo_store);
 
+static ssize_t cntrltype_show(struct device *dev,
+                             struct device_attribute *attr, char *buf)
+{
+       static const char * const type[] = {
+               [NVME_CTRL_IO] = "io\n",
+               [NVME_CTRL_DISC] = "discovery\n",
+               [NVME_CTRL_ADMIN] = "admin\n",
+       };
+       struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+       if (ctrl->cntrltype > NVME_CTRL_ADMIN || !type[ctrl->cntrltype])
+               return sysfs_emit(buf, "reserved\n");
+
+       return sysfs_emit(buf, type[ctrl->cntrltype]);
+}
+static DEVICE_ATTR_RO(cntrltype);
+
+static ssize_t dctype_show(struct device *dev,
+                          struct device_attribute *attr, char *buf)
+{
+       static const char * const type[] = {
+               [NVME_DCTYPE_NOT_REPORTED] = "none\n",
+               [NVME_DCTYPE_DDC] = "ddc\n",
+               [NVME_DCTYPE_CDC] = "cdc\n",
+       };
+       struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+       if (ctrl->dctype > NVME_DCTYPE_CDC || !type[ctrl->dctype])
+               return sysfs_emit(buf, "reserved\n");
+
+       return sysfs_emit(buf, type[ctrl->dctype]);
+}
+static DEVICE_ATTR_RO(dctype);
+
 static struct attribute *nvme_dev_attrs[] = {
        &dev_attr_reset_controller.attr,
        &dev_attr_rescan_controller.attr,
@@ -3487,6 +3524,8 @@ static struct attribute *nvme_dev_attrs[] = {
        &dev_attr_reconnect_delay.attr,
        &dev_attr_fast_io_fail_tmo.attr,
        &dev_attr_kato.attr,
+       &dev_attr_cntrltype.attr,
+       &dev_attr_dctype.attr,
        NULL
 };