lightnvm: add minor version to generic geometry

Separate the version between major and minor on the generic geometry and
represent it through sysfs in the 2.0 path. The 1.2 path only shows the
major version to preserve the existing user space interface.
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/core.c

@@ -890,8 +890,8 @@ static int nvm_init(struct nvm_dev *dev)
 		goto err;
 	}
 
-	pr_debug("nvm: ver:%u nvm_vendor:%x\n",
-				geo->ver_id,
+	pr_debug("nvm: ver:%u.%u nvm_vendor:%x\n",
+				geo->major_ver_id, geo->minor_ver_id,
 				geo->vmnt);
 
 	ret = nvm_core_init(dev);

drivers/nvme/host/lightnvm.c

@@ -295,7 +295,9 @@ static int nvme_nvm_setup_12(struct nvme_nvm_id12 *id,
 		return -EINVAL;
 	}
 
-	geo->ver_id = id->ver_id;
+	/* 1.2 spec. only reports a single version id - unfold */
+	geo->major_ver_id = id->ver_id;
+	geo->minor_ver_id = 2;
 
 	geo->nr_chnls = src->num_ch;
 	geo->nr_luns = src->num_lun;
@@ -379,7 +381,14 @@ static void nvme_nvm_set_addr_20(struct nvm_addrf *dst,
 static int nvme_nvm_setup_20(struct nvme_nvm_id20 *id,
 			     struct nvm_geo *geo)
 {
-	geo->ver_id = id->mjr;
+	geo->major_ver_id = id->mjr;
+	geo->minor_ver_id = id->mnr;
+
+	if (!(geo->major_ver_id == 2 && geo->minor_ver_id == 0)) {
+		pr_err("nvm: OCSSD version not supported (v%d.%d)\n",
+				geo->major_ver_id, geo->minor_ver_id);
+		return -EINVAL;
+	}
 
 	geo->nr_chnls = le16_to_cpu(id->num_grp);
 	geo->nr_luns = le16_to_cpu(id->num_pu);
@@ -914,7 +923,13 @@ static ssize_t nvm_dev_attr_show(struct device *dev,
 	attr = &dattr->attr;
 
 	if (strcmp(attr->name, "version") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", geo->ver_id);
+		if (geo->major_ver_id == 1)
+			return scnprintf(page, PAGE_SIZE, "%u\n",
+						geo->major_ver_id);
+		else
+			return scnprintf(page, PAGE_SIZE, "%u.%u\n",
+						geo->major_ver_id,
+						geo->minor_ver_id);
 	} else if (strcmp(attr->name, "capabilities") == 0) {
 		return scnprintf(page, PAGE_SIZE, "%u\n", geo->cap);
 	} else if (strcmp(attr->name, "read_typ") == 0) {
@@ -1167,7 +1182,7 @@ int nvme_nvm_register_sysfs(struct nvme_ns *ns)
 	if (!ndev)
 		return -EINVAL;
 
-	switch (geo->ver_id) {
+	switch (geo->major_ver_id) {
 	case 1:
 		return sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
 					&nvm_dev_attr_group_12);
@@ -1184,7 +1199,7 @@ void nvme_nvm_unregister_sysfs(struct nvme_ns *ns)
 	struct nvm_dev *ndev = ns->ndev;
 	struct nvm_geo *geo = &ndev->geo;
 
-	switch (geo->ver_id) {
+	switch (geo->major_ver_id) {
 	case 1:
 		sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
 					&nvm_dev_attr_group_12);

include/linux/lightnvm.h

@@ -263,7 +263,8 @@ enum {
 /* Instance geometry */
 struct nvm_geo {
 	/* device reported version */
-	u8	ver_id;
+	u8	major_ver_id;
+	u8	minor_ver_id;
 
 	/* instance specific geometry */
 	int nr_chnls;