From b0b4e09c1ae71c4ec33df0616b830ae050006e9b Mon Sep 17 00:00:00 2001 From: =?utf8?q?Matias=20Bj=C3=B8rling?= Date: Fri, 16 Sep 2016 14:25:07 +0200 Subject: [PATCH] lightnvm: control life of nvm_dev in driver MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit LightNVM compatible device drivers does not have a method to expose LightNVM specific sysfs entries. To enable LightNVM sysfs entries to be exposed, lightnvm device drivers require a struct device to attach it to. To allow both the actual device driver and lightnvm sysfs entries to coexist, the device driver tracks the lifetime of the nvm_dev structure. This patch refactors NVMe and null_blk to handle the lifetime of struct nvm_dev, which eliminates the need for struct gendisk when a lightnvm compatible device is provided. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/block/null_blk.c | 22 ++++++++++++++++++++-- drivers/lightnvm/core.c | 35 ++++++++--------------------------- drivers/nvme/host/core.c | 36 +++++++++++++++--------------------- drivers/nvme/host/lightnvm.c | 31 ++++++++++++++++++++++++------- drivers/nvme/host/nvme.h | 12 +++++++----- include/linux/lightnvm.h | 15 +++++++++------ 6 files changed, 83 insertions(+), 68 deletions(-) diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 895867a8a783..91e1de898daf 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -34,6 +34,7 @@ struct nullb { unsigned int index; struct request_queue *q; struct gendisk *disk; + struct nvm_dev *ndev; struct blk_mq_tag_set tag_set; struct hrtimer timer; unsigned int queue_depth; @@ -550,12 +551,29 @@ static struct nvm_dev_ops null_lnvm_dev_ops = { static int null_nvm_register(struct nullb *nullb) { - return nvm_register(nullb->q, nullb->disk_name, &null_lnvm_dev_ops); + struct nvm_dev *dev; + int rv; + + dev = nvm_alloc_dev(0); + if (!dev) + return -ENOMEM; + + dev->q = nullb->q; + memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN); + dev->ops = &null_lnvm_dev_ops; + + rv = nvm_register(dev); + if (rv) { + kfree(dev); + return rv; + } + nullb->ndev = dev; + return 0; } static void null_nvm_unregister(struct nullb *nullb) { - nvm_unregister(nullb->disk_name); + nvm_unregister(nullb->ndev); } #else static int null_nvm_register(struct nullb *nullb) diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index 25c5df920326..a99b59d1eb36 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -660,22 +660,15 @@ static void nvm_exit(struct nvm_dev *dev) pr_info("nvm: successfully unloaded\n"); } -int nvm_register(struct request_queue *q, char *disk_name, - struct nvm_dev_ops *ops) +struct nvm_dev *nvm_alloc_dev(int node) { - struct nvm_dev *dev; - int ret; - - if (!ops->identity) - return -EINVAL; - - dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL); - if (!dev) - return -ENOMEM; + return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node); +} +EXPORT_SYMBOL(nvm_alloc_dev); - dev->q = q; - dev->ops = ops; - strncpy(dev->name, disk_name, DISK_NAME_LEN); +int nvm_register(struct nvm_dev *dev) +{ + int ret; ret = nvm_init(dev); if (ret) @@ -714,29 +707,17 @@ int nvm_register(struct request_queue *q, char *disk_name, return 0; err_init: kfree(dev->lun_map); - kfree(dev); return ret; } EXPORT_SYMBOL(nvm_register); -void nvm_unregister(char *disk_name) +void nvm_unregister(struct nvm_dev *dev) { - struct nvm_dev *dev; - down_write(&nvm_lock); - dev = nvm_find_nvm_dev(disk_name); - if (!dev) { - pr_err("nvm: could not find device %s to unregister\n", - disk_name); - up_write(&nvm_lock); - return; - } - list_del(&dev->devices); up_write(&nvm_lock); nvm_exit(dev); - kfree(dev); } EXPORT_SYMBOL(nvm_unregister); diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 2c3da3315a02..3c707d83b1da 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -156,12 +156,14 @@ static void nvme_free_ns(struct kref *kref) { struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); - if (ns->type == NVME_NS_LIGHTNVM) - nvme_nvm_unregister(ns->queue, ns->disk->disk_name); + if (ns->ndev) + nvme_nvm_unregister(ns); - spin_lock(&dev_list_lock); - ns->disk->private_data = NULL; - spin_unlock(&dev_list_lock); + if (ns->disk) { + spin_lock(&dev_list_lock); + ns->disk->private_data = NULL; + spin_unlock(&dev_list_lock); + } put_disk(ns->disk); ida_simple_remove(&ns->ctrl->ns_ida, ns->instance); @@ -891,8 +893,7 @@ static void nvme_config_discard(struct nvme_ns *ns) static int nvme_revalidate_ns(struct nvme_ns *ns, struct nvme_id_ns **id) { if (nvme_identify_ns(ns->ctrl, ns->ns_id, id)) { - dev_warn(disk_to_dev(ns->disk), "%s: Identify failure\n", - __func__); + dev_warn(ns->ctrl->dev, "%s: Identify failure\n", __func__); return -ENODEV; } @@ -1683,18 +1684,11 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) goto out_free_queue; if (nvme_nvm_ns_supported(ns, id)) { - if (nvme_nvm_register(ns->queue, disk_name)) { - dev_warn(ctrl->dev, - "%s: LightNVM init failure\n", __func__); + if (nvme_nvm_register(ns, disk_name, node)) { + dev_warn(ctrl->dev, "%s: LightNVM init failure\n", + __func__); goto out_free_id; } - - disk = alloc_disk_node(0, node); - if (!disk) - goto out_free_id; - memcpy(disk->disk_name, disk_name, DISK_NAME_LEN); - ns->disk = disk; - ns->type = NVME_NS_LIGHTNVM; } else { disk = alloc_disk_node(0, node); if (!disk) @@ -1718,7 +1712,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) kfree(id); - if (ns->type == NVME_NS_LIGHTNVM) + if (ns->ndev) return; device_add_disk(ctrl->device, ns->disk); @@ -1742,7 +1736,7 @@ static void nvme_ns_remove(struct nvme_ns *ns) if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) return; - if (ns->disk->flags & GENHD_FL_UP) { + if (ns->disk && ns->disk->flags & GENHD_FL_UP) { if (blk_get_integrity(ns->disk)) blk_integrity_unregister(ns->disk); sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, @@ -1765,7 +1759,7 @@ static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid) ns = nvme_find_get_ns(ctrl, nsid); if (ns) { - if (revalidate_disk(ns->disk)) + if (ns->disk && revalidate_disk(ns->disk)) nvme_ns_remove(ns); nvme_put_ns(ns); } else @@ -2070,7 +2064,7 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl) * Revalidating a dead namespace sets capacity to 0. This will * end buffered writers dirtying pages that can't be synced. */ - if (!test_and_set_bit(NVME_NS_DEAD, &ns->flags)) + if (ns->disk && !test_and_set_bit(NVME_NS_DEAD, &ns->flags)) revalidate_disk(ns->disk); blk_set_queue_dying(ns->queue); diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c index 7268a7a1a19a..798fcd9f5d1f 100644 --- a/drivers/nvme/host/lightnvm.c +++ b/drivers/nvme/host/lightnvm.c @@ -474,9 +474,8 @@ static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd, c->ph_rw.length = cpu_to_le16(rqd->nr_ppas - 1); if (rqd->opcode == NVM_OP_HBWRITE || rqd->opcode == NVM_OP_HBREAD) - /* momentarily hardcode the shift configuration. lba_shift from - * nvm_dev will be available in a follow-up patch */ - c->hb_rw.slba = cpu_to_le64(rqd->bio->bi_iter.bi_sector >> 3); + c->hb_rw.slba = cpu_to_le64(nvme_block_nr(ns, + rqd->bio->bi_iter.bi_sector)); } static void nvme_nvm_end_io(struct request *rq, int error) @@ -593,14 +592,32 @@ static struct nvm_dev_ops nvme_nvm_dev_ops = { .max_phys_sect = 64, }; -int nvme_nvm_register(struct request_queue *q, char *disk_name) +int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node) { - return nvm_register(q, disk_name, &nvme_nvm_dev_ops); + struct request_queue *q = ns->queue; + struct nvm_dev *dev; + int ret; + + dev = nvm_alloc_dev(node); + if (!dev) + return -ENOMEM; + + dev->q = q; + memcpy(dev->name, disk_name, DISK_NAME_LEN); + dev->ops = &nvme_nvm_dev_ops; + ns->ndev = dev; + + ret = nvm_register(dev); + + ns->lba_shift = ilog2(dev->sec_size) - 9; + + return ret; } -void nvme_nvm_unregister(struct request_queue *q, char *disk_name) +void nvme_nvm_unregister(struct nvme_ns *ns) { - nvm_unregister(disk_name); + nvm_unregister(ns->ndev); + kfree(ns->ndev); } /* move to shared place when used in multiple places. */ diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index ab18b78102bf..e0535c14e538 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -18,6 +18,7 @@ #include #include #include +#include enum { /* @@ -154,6 +155,7 @@ struct nvme_ns { struct nvme_ctrl *ctrl; struct request_queue *queue; struct gendisk *disk; + struct nvm_dev *ndev; struct kref kref; int instance; @@ -165,7 +167,6 @@ struct nvme_ns { u16 ms; bool ext; u8 pi_type; - int type; unsigned long flags; #define NVME_NS_REMOVING 0 @@ -307,15 +308,16 @@ int nvme_sg_get_version_num(int __user *ip); #ifdef CONFIG_NVM int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id); -int nvme_nvm_register(struct request_queue *q, char *disk_name); -void nvme_nvm_unregister(struct request_queue *q, char *disk_name); +int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node); +void nvme_nvm_unregister(struct nvme_ns *ns); #else -static inline int nvme_nvm_register(struct request_queue *q, char *disk_name) +static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, + int node) { return 0; } -static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {}; +static inline void nvme_nvm_unregister(struct nvme_ns *ns) {}; static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id) { diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h index ba78b8306674..5afc2634f332 100644 --- a/include/linux/lightnvm.h +++ b/include/linux/lightnvm.h @@ -524,9 +524,9 @@ extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *, unsigned long); extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *); -extern int nvm_register(struct request_queue *, char *, - struct nvm_dev_ops *); -extern void nvm_unregister(char *); +extern struct nvm_dev *nvm_alloc_dev(int); +extern int nvm_register(struct nvm_dev *); +extern void nvm_unregister(struct nvm_dev *); void nvm_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type); @@ -575,11 +575,14 @@ extern int nvm_dev_factory(struct nvm_dev *, int flags); #else /* CONFIG_NVM */ struct nvm_dev_ops; -static inline int nvm_register(struct request_queue *q, char *disk_name, - struct nvm_dev_ops *ops) +static inline struct nvm_dev *nvm_alloc_dev(int node) +{ + return ERR_PTR(-EINVAL); +} +static inline int nvm_register(struct nvm_dev *dev) { return -EINVAL; } -static inline void nvm_unregister(char *disk_name) {} +static inline void nvm_unregister(struct nvm_dev *dev) {} #endif /* CONFIG_NVM */ #endif /* LIGHTNVM.H */ -- 2.20.1