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SubjectRe: [PATCH] lightnvm: simplify geometry enumeration
Date
> On 29 Nov 2018, at 15.27, Matias Bjørling <mb@lightnvm.io> wrote:
>
> 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@lightnvm.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
>
>
> _______________________________________________
> Linux-nvme mailing list
> Linux-nvme@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-nvme

Good refactor; much better to do initialization on a single step.

Reviewed-by: Javier González <javier@cnexlabs.com>

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