[PATCH] lightnvm: simplify geometry enumeration

[Matias BjÃrling]

Currently the geometry of an OCSSD is enumerated using a two step
approach:

First, nvm_register is called, the OCSSD identify command is issued,
and second the geometry sos and csecs values are read either from the
OCSSD identify if it is a 1.2 drive, or from the NVMe namespace data
structure if it is a 2.0 device.

This patch recombines it into a single step, such that nvm_register can
use the csecs and sos fields independent of which version is used. This
enables one to dynamically size the lightnvm subsystem dma pool.

Signed-off-by: Matias BjÃrling <mb@xxxxxxxxxxx>
---
 drivers/lightnvm/core.c      | 12 +++++-------
 drivers/nvme/host/core.c     | 18 +++++++++---------
 drivers/nvme/host/lightnvm.c | 18 ++++++------------
 drivers/nvme/host/nvme.h     |  2 --
 4 files changed, 20 insertions(+), 30 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 73ab3cf26868..a1d52e934ce4 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -1145,25 +1145,23 @@ int nvm_register(struct nvm_dev *dev)
 	if (!dev->q || !dev->ops)
 		return -EINVAL;
 
+	ret = nvm_init(dev);
+	if (ret)
+		return ret;
+
 	dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
 	if (!dev->dma_pool) {
 		pr_err("nvm: could not create dma pool\n");
+		nvm_free(dev);
 		return -ENOMEM;
 	}
 
-	ret = nvm_init(dev);
-	if (ret)
-		goto err_init;
-
 	/* register device with a supported media manager */
 	down_write(&nvm_lock);
 	list_add(&dev->devices, &nvm_devices);
 	up_write(&nvm_lock);
 
 	return 0;
-err_init:
-	dev->ops->destroy_dma_pool(dev->dma_pool);
-	return ret;
 }
 EXPORT_SYMBOL(nvm_register);
 
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 65c42448e904..387833b37e38 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1516,8 +1516,6 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
 	if (ns->noiob)
 		nvme_set_chunk_size(ns);
 	nvme_update_disk_info(disk, ns, id);
-	if (ns->ndev)
-		nvme_nvm_update_nvm_info(ns);
 #ifdef CONFIG_NVME_MULTIPATH
 	if (ns->head->disk)
 		nvme_update_disk_info(ns->head->disk, ns, id);
@@ -3086,13 +3084,6 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	nvme_setup_streams_ns(ctrl, ns);
 	nvme_set_disk_name(disk_name, ns, ctrl, &flags);
 
-	if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
-		if (nvme_nvm_register(ns, disk_name, node)) {
-			dev_warn(ctrl->device, "LightNVM init failure\n");
-			goto out_unlink_ns;
-		}
-	}
-
 	disk = alloc_disk_node(0, node);
 	if (!disk)
 		goto out_unlink_ns;
@@ -3106,6 +3097,13 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 
 	__nvme_revalidate_disk(disk, id);
 
+	if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
+		if (nvme_nvm_register(ns, disk_name, node)) {
+			dev_warn(ctrl->device, "LightNVM init failure\n");
+			goto out_put_disk;
+		}
+	}
+
 	down_write(&ctrl->namespaces_rwsem);
 	list_add_tail(&ns->list, &ctrl->namespaces);
 	up_write(&ctrl->namespaces_rwsem);
@@ -3119,6 +3117,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	kfree(id);
 
 	return;
+ out_put_disk:
+	put_disk(ns->disk);
  out_unlink_ns:
 	mutex_lock(&ctrl->subsys->lock);
 	list_del_rcu(&ns->siblings);
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index d64805dc8efb..51d957ccf328 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -973,22 +973,11 @@ int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg)
 	}
 }
 
-void nvme_nvm_update_nvm_info(struct nvme_ns *ns)
-{
-	struct nvm_dev *ndev = ns->ndev;
-	struct nvm_geo *geo = &ndev->geo;
-
-	if (geo->version == NVM_OCSSD_SPEC_12)
-		return;
-
-	geo->csecs = 1 << ns->lba_shift;
-	geo->sos = ns->ms;
-}
-
 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node)
 {
 	struct request_queue *q = ns->queue;
 	struct nvm_dev *dev;
+	struct nvm_geo *geo;
 
 	_nvme_nvm_check_size();
 
@@ -996,6 +985,11 @@ int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node)
 	if (!dev)
 		return -ENOMEM;
 
+	/* Note that csecs and sos will be overridden if it is a 1.2 drive. */
+	geo = &dev->geo;
+	geo->csecs = 1 << ns->lba_shift;
+	geo->sos = ns->ms;
+
 	dev->q = q;
 	memcpy(dev->name, disk_name, DISK_NAME_LEN);
 	dev->ops = &nvme_nvm_dev_ops;
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 9fefba039d1e..4f5399c8808b 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -541,13 +541,11 @@ static inline void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 #endif /* CONFIG_NVME_MULTIPATH */
 
 #ifdef CONFIG_NVM
-void nvme_nvm_update_nvm_info(struct nvme_ns *ns);
 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
 void nvme_nvm_unregister(struct nvme_ns *ns);
 extern const struct attribute_group nvme_nvm_attr_group;
 int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
 #else
-static inline void nvme_nvm_update_nvm_info(struct nvme_ns *ns) {};
 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
 				    int node)
 {
-- 
2.17.1