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Date: Thu, 29 Nov 2018 15:27:38 +0100
From: Matias Bjørling <mb@...htnvm.io>
To: igor.j.konopko@...el.com, marcin.dziegielewski@...el.com,
javier@...xlabs.com
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
keith.busch@...el.com, linux-nvme@...ts.infradead.org,
Matias Bjørling <mb@...htnvm.io>
Subject: [PATCH] lightnvm: simplify geometry enumeration
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 Bjørling <mb@...htnvm.io>
---
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
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