diff options
Diffstat (limited to 'drivers/lightnvm/core.c')
| -rw-r--r-- | drivers/lightnvm/core.c | 1440 |
1 files changed, 0 insertions, 1440 deletions
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c deleted file mode 100644 index cf8a75494833..000000000000 --- a/drivers/lightnvm/core.c +++ /dev/null @@ -1,1440 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2015 IT University of Copenhagen. All rights reserved. - * Initial release: Matias Bjorling <m@bjorling.me> - */ - -#define pr_fmt(fmt) "nvm: " fmt - -#include <linux/list.h> -#include <linux/types.h> -#include <linux/sem.h> -#include <linux/bitmap.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/miscdevice.h> -#include <linux/lightnvm.h> -#include <linux/sched/sysctl.h> - -static LIST_HEAD(nvm_tgt_types); -static DECLARE_RWSEM(nvm_tgtt_lock); -static LIST_HEAD(nvm_devices); -static DECLARE_RWSEM(nvm_lock); - -/* Map between virtual and physical channel and lun */ -struct nvm_ch_map { - int ch_off; - int num_lun; - int *lun_offs; -}; - -struct nvm_dev_map { - struct nvm_ch_map *chnls; - int num_ch; -}; - -static void nvm_free(struct kref *ref); - -static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name) -{ - struct nvm_target *tgt; - - list_for_each_entry(tgt, &dev->targets, list) - if (!strcmp(name, tgt->disk->disk_name)) - return tgt; - - return NULL; -} - -static bool nvm_target_exists(const char *name) -{ - struct nvm_dev *dev; - struct nvm_target *tgt; - bool ret = false; - - down_write(&nvm_lock); - list_for_each_entry(dev, &nvm_devices, devices) { - mutex_lock(&dev->mlock); - list_for_each_entry(tgt, &dev->targets, list) { - if (!strcmp(name, tgt->disk->disk_name)) { - ret = true; - mutex_unlock(&dev->mlock); - goto out; - } - } - mutex_unlock(&dev->mlock); - } - -out: - up_write(&nvm_lock); - return ret; -} - -static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end) -{ - int i; - - for (i = lun_begin; i <= lun_end; i++) { - if (test_and_set_bit(i, dev->lun_map)) { - pr_err("lun %d already allocated\n", i); - goto err; - } - } - - return 0; -err: - while (--i >= lun_begin) - clear_bit(i, dev->lun_map); - - return -EBUSY; -} - -static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin, - int lun_end) -{ - int i; - - for (i = lun_begin; i <= lun_end; i++) - WARN_ON(!test_and_clear_bit(i, dev->lun_map)); -} - -static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear) -{ - struct nvm_dev *dev = tgt_dev->parent; - struct nvm_dev_map *dev_map = tgt_dev->map; - int i, j; - - for (i = 0; i < dev_map->num_ch; i++) { - struct nvm_ch_map *ch_map = &dev_map->chnls[i]; - int *lun_offs = ch_map->lun_offs; - int ch = i + ch_map->ch_off; - - if (clear) { - for (j = 0; j < ch_map->num_lun; j++) { - int lun = j + lun_offs[j]; - int lunid = (ch * dev->geo.num_lun) + lun; - - WARN_ON(!test_and_clear_bit(lunid, - dev->lun_map)); - } - } - - kfree(ch_map->lun_offs); - } - - kfree(dev_map->chnls); - kfree(dev_map); - - kfree(tgt_dev->luns); - kfree(tgt_dev); -} - -static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev, - u16 lun_begin, u16 lun_end, - u16 op) -{ - struct nvm_tgt_dev *tgt_dev = NULL; - struct nvm_dev_map *dev_rmap = dev->rmap; - struct nvm_dev_map *dev_map; - struct ppa_addr *luns; - int num_lun = lun_end - lun_begin + 1; - int luns_left = num_lun; - int num_ch = num_lun / dev->geo.num_lun; - int num_ch_mod = num_lun % dev->geo.num_lun; - int bch = lun_begin / dev->geo.num_lun; - int blun = lun_begin % dev->geo.num_lun; - int lunid = 0; - int lun_balanced = 1; - int sec_per_lun, prev_num_lun; - int i, j; - - num_ch = (num_ch_mod == 0) ? num_ch : num_ch + 1; - - dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL); - if (!dev_map) - goto err_dev; - - dev_map->chnls = kcalloc(num_ch, sizeof(struct nvm_ch_map), GFP_KERNEL); - if (!dev_map->chnls) - goto err_chnls; - - luns = kcalloc(num_lun, sizeof(struct ppa_addr), GFP_KERNEL); - if (!luns) - goto err_luns; - - prev_num_lun = (luns_left > dev->geo.num_lun) ? - dev->geo.num_lun : luns_left; - for (i = 0; i < num_ch; i++) { - struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch]; - int *lun_roffs = ch_rmap->lun_offs; - struct nvm_ch_map *ch_map = &dev_map->chnls[i]; - int *lun_offs; - int luns_in_chnl = (luns_left > dev->geo.num_lun) ? - dev->geo.num_lun : luns_left; - - if (lun_balanced && prev_num_lun != luns_in_chnl) - lun_balanced = 0; - - ch_map->ch_off = ch_rmap->ch_off = bch; - ch_map->num_lun = luns_in_chnl; - - lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); - if (!lun_offs) - goto err_ch; - - for (j = 0; j < luns_in_chnl; j++) { - luns[lunid].ppa = 0; - luns[lunid].a.ch = i; - luns[lunid++].a.lun = j; - - lun_offs[j] = blun; - lun_roffs[j + blun] = blun; - } - - ch_map->lun_offs = lun_offs; - - /* when starting a new channel, lun offset is reset */ - blun = 0; - luns_left -= luns_in_chnl; - } - - dev_map->num_ch = num_ch; - - tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL); - if (!tgt_dev) - goto err_ch; - - /* Inherit device geometry from parent */ - memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo)); - - /* Target device only owns a portion of the physical device */ - tgt_dev->geo.num_ch = num_ch; - tgt_dev->geo.num_lun = (lun_balanced) ? prev_num_lun : -1; - tgt_dev->geo.all_luns = num_lun; - tgt_dev->geo.all_chunks = num_lun * dev->geo.num_chk; - - tgt_dev->geo.op = op; - - sec_per_lun = dev->geo.clba * dev->geo.num_chk; - tgt_dev->geo.total_secs = num_lun * sec_per_lun; - - tgt_dev->q = dev->q; - tgt_dev->map = dev_map; - tgt_dev->luns = luns; - tgt_dev->parent = dev; - - return tgt_dev; -err_ch: - while (--i >= 0) - kfree(dev_map->chnls[i].lun_offs); - kfree(luns); -err_luns: - kfree(dev_map->chnls); -err_chnls: - kfree(dev_map); -err_dev: - return tgt_dev; -} - -static struct nvm_tgt_type *__nvm_find_target_type(const char *name) -{ - struct nvm_tgt_type *tt; - - list_for_each_entry(tt, &nvm_tgt_types, list) - if (!strcmp(name, tt->name)) - return tt; - - return NULL; -} - -static struct nvm_tgt_type *nvm_find_target_type(const char *name) -{ - struct nvm_tgt_type *tt; - - down_write(&nvm_tgtt_lock); - tt = __nvm_find_target_type(name); - up_write(&nvm_tgtt_lock); - - return tt; -} - -static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin, - int lun_end) -{ - if (lun_begin > lun_end || lun_end >= geo->all_luns) { - pr_err("lun out of bound (%u:%u > %u)\n", - lun_begin, lun_end, geo->all_luns - 1); - return -EINVAL; - } - - return 0; -} - -static int __nvm_config_simple(struct nvm_dev *dev, - struct nvm_ioctl_create_simple *s) -{ - struct nvm_geo *geo = &dev->geo; - - if (s->lun_begin == -1 && s->lun_end == -1) { - s->lun_begin = 0; - s->lun_end = geo->all_luns - 1; - } - - return nvm_config_check_luns(geo, s->lun_begin, s->lun_end); -} - -static int __nvm_config_extended(struct nvm_dev *dev, - struct nvm_ioctl_create_extended *e) -{ - if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) { - e->lun_begin = 0; - e->lun_end = dev->geo.all_luns - 1; - } - - /* op not set falls into target's default */ - if (e->op == 0xFFFF) { - e->op = NVM_TARGET_DEFAULT_OP; - } else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) { - pr_err("invalid over provisioning value\n"); - return -EINVAL; - } - - return nvm_config_check_luns(&dev->geo, e->lun_begin, e->lun_end); -} - -static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) -{ - struct nvm_ioctl_create_extended e; - struct gendisk *tdisk; - struct nvm_tgt_type *tt; - struct nvm_target *t; - struct nvm_tgt_dev *tgt_dev; - void *targetdata; - unsigned int mdts; - int ret; - - switch (create->conf.type) { - case NVM_CONFIG_TYPE_SIMPLE: - ret = __nvm_config_simple(dev, &create->conf.s); - if (ret) - return ret; - - e.lun_begin = create->conf.s.lun_begin; - e.lun_end = create->conf.s.lun_end; - e.op = NVM_TARGET_DEFAULT_OP; - break; - case NVM_CONFIG_TYPE_EXTENDED: - ret = __nvm_config_extended(dev, &create->conf.e); - if (ret) - return ret; - - e = create->conf.e; - break; - default: - pr_err("config type not valid\n"); - return -EINVAL; - } - - tt = nvm_find_target_type(create->tgttype); - if (!tt) { - pr_err("target type %s not found\n", create->tgttype); - return -EINVAL; - } - - if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) { - pr_err("device is incompatible with target L2P type.\n"); - return -EINVAL; - } - - if (nvm_target_exists(create->tgtname)) { - pr_err("target name already exists (%s)\n", - create->tgtname); - return -EINVAL; - } - - ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end); - if (ret) - return ret; - - t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); - if (!t) { - ret = -ENOMEM; - goto err_reserve; - } - - tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op); - if (!tgt_dev) { - pr_err("could not create target device\n"); - ret = -ENOMEM; - goto err_t; - } - - tdisk = blk_alloc_disk(dev->q->node); - if (!tdisk) { - ret = -ENOMEM; - goto err_dev; - } - - strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name)); - tdisk->major = 0; - tdisk->first_minor = 0; - tdisk->fops = tt->bops; - - targetdata = tt->init(tgt_dev, tdisk, create->flags); - if (IS_ERR(targetdata)) { - ret = PTR_ERR(targetdata); - goto err_init; - } - - tdisk->private_data = targetdata; - tdisk->queue->queuedata = targetdata; - - mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA; - if (dev->geo.mdts) { - mdts = min_t(u32, dev->geo.mdts, - (dev->geo.csecs >> 9) * NVM_MAX_VLBA); - } - blk_queue_max_hw_sectors(tdisk->queue, mdts); - - set_capacity(tdisk, tt->capacity(targetdata)); - add_disk(tdisk); - - if (tt->sysfs_init && tt->sysfs_init(tdisk)) { - ret = -ENOMEM; - goto err_sysfs; - } - - t->type = tt; - t->disk = tdisk; - t->dev = tgt_dev; - - mutex_lock(&dev->mlock); - list_add_tail(&t->list, &dev->targets); - mutex_unlock(&dev->mlock); - - __module_get(tt->owner); - - return 0; -err_sysfs: - if (tt->exit) - tt->exit(targetdata, true); -err_init: - blk_cleanup_disk(tdisk); -err_dev: - nvm_remove_tgt_dev(tgt_dev, 0); -err_t: - kfree(t); -err_reserve: - nvm_release_luns_err(dev, e.lun_begin, e.lun_end); - return ret; -} - -static void __nvm_remove_target(struct nvm_target *t, bool graceful) -{ - struct nvm_tgt_type *tt = t->type; - struct gendisk *tdisk = t->disk; - - del_gendisk(tdisk); - - if (tt->sysfs_exit) - tt->sysfs_exit(tdisk); - - if (tt->exit) - tt->exit(tdisk->private_data, graceful); - - nvm_remove_tgt_dev(t->dev, 1); - blk_cleanup_disk(tdisk); - module_put(t->type->owner); - - list_del(&t->list); - kfree(t); -} - -/** - * nvm_remove_tgt - Removes a target from the media manager - * @remove: ioctl structure with target name to remove. - * - * Returns: - * 0: on success - * 1: on not found - * <0: on error - */ -static int nvm_remove_tgt(struct nvm_ioctl_remove *remove) -{ - struct nvm_target *t = NULL; - struct nvm_dev *dev; - - down_read(&nvm_lock); - list_for_each_entry(dev, &nvm_devices, devices) { - mutex_lock(&dev->mlock); - t = nvm_find_target(dev, remove->tgtname); - if (t) { - mutex_unlock(&dev->mlock); - break; - } - mutex_unlock(&dev->mlock); - } - up_read(&nvm_lock); - - if (!t) { - pr_err("failed to remove target %s\n", - remove->tgtname); - return 1; - } - - __nvm_remove_target(t, true); - kref_put(&dev->ref, nvm_free); - - return 0; -} - -static int nvm_register_map(struct nvm_dev *dev) -{ - struct nvm_dev_map *rmap; - int i, j; - - rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL); - if (!rmap) - goto err_rmap; - - rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map), - GFP_KERNEL); - if (!rmap->chnls) - goto err_chnls; - - for (i = 0; i < dev->geo.num_ch; i++) { - struct nvm_ch_map *ch_rmap; - int *lun_roffs; - int luns_in_chnl = dev->geo.num_lun; - - ch_rmap = &rmap->chnls[i]; - - ch_rmap->ch_off = -1; - ch_rmap->num_lun = luns_in_chnl; - - lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); - if (!lun_roffs) - goto err_ch; - - for (j = 0; j < luns_in_chnl; j++) - lun_roffs[j] = -1; - - ch_rmap->lun_offs = lun_roffs; - } - - dev->rmap = rmap; - - return 0; -err_ch: - while (--i >= 0) - kfree(rmap->chnls[i].lun_offs); -err_chnls: - kfree(rmap); -err_rmap: - return -ENOMEM; -} - -static void nvm_unregister_map(struct nvm_dev *dev) -{ - struct nvm_dev_map *rmap = dev->rmap; - int i; - - for (i = 0; i < dev->geo.num_ch; i++) - kfree(rmap->chnls[i].lun_offs); - - kfree(rmap->chnls); - kfree(rmap); -} - -static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) -{ - struct nvm_dev_map *dev_map = tgt_dev->map; - struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch]; - int lun_off = ch_map->lun_offs[p->a.lun]; - - p->a.ch += ch_map->ch_off; - p->a.lun += lun_off; -} - -static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) -{ - struct nvm_dev *dev = tgt_dev->parent; - struct nvm_dev_map *dev_rmap = dev->rmap; - struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch]; - int lun_roff = ch_rmap->lun_offs[p->a.lun]; - - p->a.ch -= ch_rmap->ch_off; - p->a.lun -= lun_roff; -} - -static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, - struct ppa_addr *ppa_list, int nr_ppas) -{ - int i; - - for (i = 0; i < nr_ppas; i++) { - nvm_map_to_dev(tgt_dev, &ppa_list[i]); - ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]); - } -} - -static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, - struct ppa_addr *ppa_list, int nr_ppas) -{ - int i; - - for (i = 0; i < nr_ppas; i++) { - ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]); - nvm_map_to_tgt(tgt_dev, &ppa_list[i]); - } -} - -static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) -{ - struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); - - nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas); -} - -static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) -{ - struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); - - nvm_ppa_dev_to_tgt(tgt_dev, ppa_list, rqd->nr_ppas); -} - -int nvm_register_tgt_type(struct nvm_tgt_type *tt) -{ - int ret = 0; - - down_write(&nvm_tgtt_lock); - if (__nvm_find_target_type(tt->name)) - ret = -EEXIST; - else - list_add(&tt->list, &nvm_tgt_types); - up_write(&nvm_tgtt_lock); - - return ret; -} -EXPORT_SYMBOL(nvm_register_tgt_type); - -void nvm_unregister_tgt_type(struct nvm_tgt_type *tt) -{ - if (!tt) - return; - - down_write(&nvm_tgtt_lock); - list_del(&tt->list); - up_write(&nvm_tgtt_lock); -} -EXPORT_SYMBOL(nvm_unregister_tgt_type); - -void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags, - dma_addr_t *dma_handler) -{ - return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags, - dma_handler); -} -EXPORT_SYMBOL(nvm_dev_dma_alloc); - -void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler) -{ - dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler); -} -EXPORT_SYMBOL(nvm_dev_dma_free); - -static struct nvm_dev *nvm_find_nvm_dev(const char *name) -{ - struct nvm_dev *dev; - - list_for_each_entry(dev, &nvm_devices, devices) - if (!strcmp(name, dev->name)) - return dev; - - return NULL; -} - -static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, - const struct ppa_addr *ppas, int nr_ppas) -{ - struct nvm_dev *dev = tgt_dev->parent; - struct nvm_geo *geo = &tgt_dev->geo; - int i, plane_cnt, pl_idx; - struct ppa_addr ppa; - - if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) { - rqd->nr_ppas = nr_ppas; - rqd->ppa_addr = ppas[0]; - - return 0; - } - - rqd->nr_ppas = nr_ppas; - rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); - if (!rqd->ppa_list) { - pr_err("failed to allocate dma memory\n"); - return -ENOMEM; - } - - plane_cnt = geo->pln_mode; - rqd->nr_ppas *= plane_cnt; - - for (i = 0; i < nr_ppas; i++) { - for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { - ppa = ppas[i]; - ppa.g.pl = pl_idx; - rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa; - } - } - - return 0; -} - -static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, - struct nvm_rq *rqd) -{ - if (!rqd->ppa_list) - return; - - nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list); -} - -static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd) -{ - int flags = 0; - - if (geo->version == NVM_OCSSD_SPEC_20) - return 0; - - if (rqd->is_seq) - flags |= geo->pln_mode >> 1; - - if (rqd->opcode == NVM_OP_PREAD) - flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND); - else if (rqd->opcode == NVM_OP_PWRITE) - flags |= NVM_IO_SCRAMBLE_ENABLE; - - return flags; -} - -int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf) -{ - struct nvm_dev *dev = tgt_dev->parent; - int ret; - - if (!dev->ops->submit_io) - return -ENODEV; - - nvm_rq_tgt_to_dev(tgt_dev, rqd); - - rqd->dev = tgt_dev; - rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd); - - /* In case of error, fail with right address format */ - ret = dev->ops->submit_io(dev, rqd, buf); - if (ret) - nvm_rq_dev_to_tgt(tgt_dev, rqd); - return ret; -} -EXPORT_SYMBOL(nvm_submit_io); - -static void nvm_sync_end_io(struct nvm_rq *rqd) -{ - struct completion *waiting = rqd->private; - - complete(waiting); -} - -static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd, - void *buf) -{ - DECLARE_COMPLETION_ONSTACK(wait); - int ret = 0; - - rqd->end_io = nvm_sync_end_io; - rqd->private = &wait; - - ret = dev->ops->submit_io(dev, rqd, buf); - if (ret) - return ret; - - wait_for_completion_io(&wait); - - return 0; -} - -int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, - void *buf) -{ - struct nvm_dev *dev = tgt_dev->parent; - int ret; - - if (!dev->ops->submit_io) - return -ENODEV; - - nvm_rq_tgt_to_dev(tgt_dev, rqd); - - rqd->dev = tgt_dev; - rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd); - - ret = nvm_submit_io_wait(dev, rqd, buf); - - return ret; -} -EXPORT_SYMBOL(nvm_submit_io_sync); - -void nvm_end_io(struct nvm_rq *rqd) -{ - struct nvm_tgt_dev *tgt_dev = rqd->dev; - - /* Convert address space */ - if (tgt_dev) - nvm_rq_dev_to_tgt(tgt_dev, rqd); - - if (rqd->end_io) - rqd->end_io(rqd); -} -EXPORT_SYMBOL(nvm_end_io); - -static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd) -{ - if (!dev->ops->submit_io) - return -ENODEV; - - rqd->dev = NULL; - rqd->flags = nvm_set_flags(&dev->geo, rqd); - - return nvm_submit_io_wait(dev, rqd, NULL); -} - -static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa) -{ - struct nvm_rq rqd = { NULL }; - struct bio bio; - struct bio_vec bio_vec; - struct page *page; - int ret; - - page = alloc_page(GFP_KERNEL); - if (!page) - return -ENOMEM; - - bio_init(&bio, &bio_vec, 1); - bio_add_page(&bio, page, PAGE_SIZE, 0); - bio_set_op_attrs(&bio, REQ_OP_READ, 0); - - rqd.bio = &bio; - rqd.opcode = NVM_OP_PREAD; - rqd.is_seq = 1; - rqd.nr_ppas = 1; - rqd.ppa_addr = generic_to_dev_addr(dev, ppa); - - ret = nvm_submit_io_sync_raw(dev, &rqd); - __free_page(page); - if (ret) - return ret; - - return rqd.error; -} - -/* - * Scans a 1.2 chunk first and last page to determine if its state. - * If the chunk is found to be open, also scan it to update the write - * pointer. - */ -static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa, - struct nvm_chk_meta *meta) -{ - struct nvm_geo *geo = &dev->geo; - int ret, pg, pl; - - /* sense first page */ - ret = nvm_bb_chunk_sense(dev, ppa); - if (ret < 0) /* io error */ - return ret; - else if (ret == 0) /* valid data */ - meta->state = NVM_CHK_ST_OPEN; - else if (ret > 0) { - /* - * If empty page, the chunk is free, else it is an - * actual io error. In that case, mark it offline. - */ - switch (ret) { - case NVM_RSP_ERR_EMPTYPAGE: - meta->state = NVM_CHK_ST_FREE; - return 0; - case NVM_RSP_ERR_FAILCRC: - case NVM_RSP_ERR_FAILECC: - case NVM_RSP_WARN_HIGHECC: - meta->state = NVM_CHK_ST_OPEN; - goto scan; - default: - return -ret; /* other io error */ - } - } - - /* sense last page */ - ppa.g.pg = geo->num_pg - 1; - ppa.g.pl = geo->num_pln - 1; - - ret = nvm_bb_chunk_sense(dev, ppa); - if (ret < 0) /* io error */ - return ret; - else if (ret == 0) { /* Chunk fully written */ - meta->state = NVM_CHK_ST_CLOSED; - meta->wp = geo->clba; - return 0; - } else if (ret > 0) { - switch (ret) { - case NVM_RSP_ERR_EMPTYPAGE: - case NVM_RSP_ERR_FAILCRC: - case NVM_RSP_ERR_FAILECC: - case NVM_RSP_WARN_HIGHECC: - meta->state = NVM_CHK_ST_OPEN; - break; - default: - return -ret; /* other io error */ - } - } - -scan: - /* - * chunk is open, we scan sequentially to update the write pointer. - * We make the assumption that targets write data across all planes - * before moving to the next page. - */ - for (pg = 0; pg < geo->num_pg; pg++) { - for (pl = 0; pl < geo->num_pln; pl++) { - ppa.g.pg = pg; - ppa.g.pl = pl; - - ret = nvm_bb_chunk_sense(dev, ppa); - if (ret < 0) /* io error */ - return ret; - else if (ret == 0) { - meta->wp += geo->ws_min; - } else if (ret > 0) { - switch (ret) { - case NVM_RSP_ERR_EMPTYPAGE: - return 0; - case NVM_RSP_ERR_FAILCRC: - case NVM_RSP_ERR_FAILECC: - case NVM_RSP_WARN_HIGHECC: - meta->wp += geo->ws_min; - break; - default: - return -ret; /* other io error */ - } - } - } - } - - return 0; -} - -/* - * folds a bad block list from its plane representation to its - * chunk representation. - * - * If any of the planes status are bad or grown bad, the chunk is marked - * offline. If not bad, the first plane state acts as the chunk state. - */ -static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa, - u8 *blks, int nr_blks, struct nvm_chk_meta *meta) -{ - struct nvm_geo *geo = &dev->geo; - int ret, blk, pl, offset, blktype; - - for (blk = 0; blk < geo->num_chk; blk++) { - offset = blk * geo->pln_mode; - blktype = blks[offset]; - - for (pl = 0; pl < geo->pln_mode; pl++) { - if (blks[offset + pl] & - (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) { - blktype = blks[offset + pl]; - break; - } - } - - ppa.g.blk = blk; - - meta->wp = 0; - meta->type = NVM_CHK_TP_W_SEQ; - meta->wi = 0; - meta->slba = generic_to_dev_addr(dev, ppa).ppa; - meta->cnlb = dev->geo.clba; - - if (blktype == NVM_BLK_T_FREE) { - ret = nvm_bb_chunk_scan(dev, ppa, meta); - if (ret) - return ret; - } else { - meta->state = NVM_CHK_ST_OFFLINE; - } - - meta++; - } - - return 0; -} - -static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba, - int nchks, struct nvm_chk_meta *meta) -{ - struct nvm_geo *geo = &dev->geo; - struct ppa_addr ppa; - u8 *blks; - int ch, lun, nr_blks; - int ret = 0; - - ppa.ppa = slba; - ppa = dev_to_generic_addr(dev, ppa); - - if (ppa.g.blk != 0) - return -EINVAL; - - if ((nchks % geo->num_chk) != 0) - return -EINVAL; - - nr_blks = geo->num_chk * geo->pln_mode; - - blks = kmalloc(nr_blks, GFP_KERNEL); - if (!blks) - return -ENOMEM; - - for (ch = ppa.g.ch; ch < geo->num_ch; ch++) { - for (lun = ppa.g.lun; lun < geo->num_lun; lun++) { - struct ppa_addr ppa_gen, ppa_dev; - - if (!nchks) - goto done; - - ppa_gen.ppa = 0; - ppa_gen.g.ch = ch; - ppa_gen.g.lun = lun; - ppa_dev = generic_to_dev_addr(dev, ppa_gen); - - ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks); - if (ret) - goto done; - - ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks, - meta); - if (ret) - goto done; - - meta += geo->num_chk; - nchks -= geo->num_chk; - } - } -done: - kfree(blks); - return ret; -} - -int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa, - int nchks, struct nvm_chk_meta *meta) -{ - struct nvm_dev *dev = tgt_dev->parent; - - nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1); - - if (dev->geo.version == NVM_OCSSD_SPEC_12) - return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta); - - return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta); -} -EXPORT_SYMBOL_GPL(nvm_get_chunk_meta); - -int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, - int nr_ppas, int type) -{ - struct nvm_dev *dev = tgt_dev->parent; - struct nvm_rq rqd; - int ret; - - if (dev->geo.version == NVM_OCSSD_SPEC_20) - return 0; - - if (nr_ppas > NVM_MAX_VLBA) { - pr_err("unable to update all blocks atomically\n"); - return -EINVAL; - } - - memset(&rqd, 0, sizeof(struct nvm_rq)); - - nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas); - nvm_rq_tgt_to_dev(tgt_dev, &rqd); - - ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type); - nvm_free_rqd_ppalist(tgt_dev, &rqd); - if (ret) - return -EINVAL; - - return 0; -} -EXPORT_SYMBOL_GPL(nvm_set_chunk_meta); - -static int nvm_core_init(struct nvm_dev *dev) -{ - struct nvm_geo *geo = &dev->geo; - int ret; - - dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns), - sizeof(unsigned long), GFP_KERNEL); - if (!dev->lun_map) - return -ENOMEM; - - INIT_LIST_HEAD(&dev->area_list); - INIT_LIST_HEAD(&dev->targets); - mutex_init(&dev->mlock); - spin_lock_init(&dev->lock); - - ret = nvm_register_map(dev); - if (ret) - goto err_fmtype; - - return 0; -err_fmtype: - kfree(dev->lun_map); - return ret; -} - -static void nvm_free(struct kref *ref) -{ - struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref); - - if (dev->dma_pool) - dev->ops->destroy_dma_pool(dev->dma_pool); - - if (dev->rmap) - nvm_unregister_map(dev); - - kfree(dev->lun_map); - kfree(dev); -} - -static int nvm_init(struct nvm_dev *dev) -{ - struct nvm_geo *geo = &dev->geo; - int ret = -EINVAL; - - if (dev->ops->identity(dev)) { - pr_err("device could not be identified\n"); - goto err; - } - - pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id, - geo->minor_ver_id, geo->vmnt); - - ret = nvm_core_init(dev); - if (ret) { - pr_err("could not initialize core structures.\n"); - goto err; - } - - pr_info("registered %s [%u/%u/%u/%u/%u]\n", - dev->name, dev->geo.ws_min, dev->geo.ws_opt, - dev->geo.num_chk, dev->geo.all_luns, - dev->geo.num_ch); - return 0; -err: - pr_err("failed to initialize nvm\n"); - return ret; -} - -struct nvm_dev *nvm_alloc_dev(int node) -{ - struct nvm_dev *dev; - - dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node); - if (dev) - kref_init(&dev->ref); - - return dev; -} -EXPORT_SYMBOL(nvm_alloc_dev); - -int nvm_register(struct nvm_dev *dev) -{ - int ret, exp_pool_size; - - pr_warn_once("lightnvm support is deprecated and will be removed in Linux 5.15.\n"); - - if (!dev->q || !dev->ops) { - kref_put(&dev->ref, nvm_free); - return -EINVAL; - } - - ret = nvm_init(dev); - if (ret) { - kref_put(&dev->ref, nvm_free); - return ret; - } - - exp_pool_size = max_t(int, PAGE_SIZE, - (NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos))); - exp_pool_size = round_up(exp_pool_size, PAGE_SIZE); - - dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist", - exp_pool_size); - if (!dev->dma_pool) { - pr_err("could not create dma pool\n"); - kref_put(&dev->ref, nvm_free); - return -ENOMEM; - } - - /* register device with a supported media manager */ - down_write(&nvm_lock); - list_add(&dev->devices, &nvm_devices); - up_write(&nvm_lock); - - return 0; -} -EXPORT_SYMBOL(nvm_register); - -void nvm_unregister(struct nvm_dev *dev) -{ - struct nvm_target *t, *tmp; - - mutex_lock(&dev->mlock); - list_for_each_entry_safe(t, tmp, &dev->targets, list) { - if (t->dev->parent != dev) - continue; - __nvm_remove_target(t, false); - kref_put(&dev->ref, nvm_free); - } - mutex_unlock(&dev->mlock); - - down_write(&nvm_lock); - list_del(&dev->devices); - up_write(&nvm_lock); - - kref_put(&dev->ref, nvm_free); -} -EXPORT_SYMBOL(nvm_unregister); - -static int __nvm_configure_create(struct nvm_ioctl_create *create) -{ - struct nvm_dev *dev; - int ret; - - down_write(&nvm_lock); - dev = nvm_find_nvm_dev(create->dev); - up_write(&nvm_lock); - - if (!dev) { - pr_err("device not found\n"); - return -EINVAL; - } - - kref_get(&dev->ref); - ret = nvm_create_tgt(dev, create); - if (ret) - kref_put(&dev->ref, nvm_free); - - return ret; -} - -static long nvm_ioctl_info(struct file *file, void __user *arg) -{ - struct nvm_ioctl_info *info; - struct nvm_tgt_type *tt; - int tgt_iter = 0; - - info = memdup_user(arg, sizeof(struct nvm_ioctl_info)); - if (IS_ERR(info)) - return PTR_ERR(info); - - info->version[0] = NVM_VERSION_MAJOR; - info->version[1] = NVM_VERSION_MINOR; - info->version[2] = NVM_VERSION_PATCH; - - down_write(&nvm_tgtt_lock); - list_for_each_entry(tt, &nvm_tgt_types, list) { - struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; - - tgt->version[0] = tt->version[0]; - tgt->version[1] = tt->version[1]; - tgt->version[2] = tt->version[2]; - strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX); - - tgt_iter++; - } - - info->tgtsize = tgt_iter; - up_write(&nvm_tgtt_lock); - - if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) { - kfree(info); - return -EFAULT; - } - - kfree(info); - return 0; -} - -static long nvm_ioctl_get_devices(struct file *file, void __user *arg) -{ - struct nvm_ioctl_get_devices *devices; - struct nvm_dev *dev; - int i = 0; - - devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL); - if (!devices) - return -ENOMEM; - - down_write(&nvm_lock); - list_for_each_entry(dev, &nvm_devices, devices) { - struct nvm_ioctl_device_info *info = &devices->info[i]; - - strlcpy(info->devname, dev->name, sizeof(info->devname)); - - /* kept for compatibility */ - info->bmversion[0] = 1; - info->bmversion[1] = 0; - info->bmversion[2] = 0; - strlcpy(info->bmname, "gennvm", sizeof(info->bmname)); - i++; - - if (i >= ARRAY_SIZE(devices->info)) { - pr_err("max %zd devices can be reported.\n", - ARRAY_SIZE(devices->info)); - break; - } - } - up_write(&nvm_lock); - - devices->nr_devices = i; - - if (copy_to_user(arg, devices, - sizeof(struct nvm_ioctl_get_devices))) { - kfree(devices); - return -EFAULT; - } - - kfree(devices); - return 0; -} - -static long nvm_ioctl_dev_create(struct file *file, void __user *arg) -{ - struct nvm_ioctl_create create; - - if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) - return -EFAULT; - - if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED && - create.conf.e.rsv != 0) { - pr_err("reserved config field in use\n"); - return -EINVAL; - } - - create.dev[DISK_NAME_LEN - 1] = '\0'; - create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0'; - create.tgtname[DISK_NAME_LEN - 1] = '\0'; - - if (create.flags != 0) { - __u32 flags = create.flags; - - /* Check for valid flags */ - if (flags & NVM_TARGET_FACTORY) - flags &= ~NVM_TARGET_FACTORY; - - if (flags) { - pr_err("flag not supported\n"); - return -EINVAL; - } - } - - return __nvm_configure_create(&create); -} - -static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) -{ - struct nvm_ioctl_remove remove; - - if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove))) - return -EFAULT; - - remove.tgtname[DISK_NAME_LEN - 1] = '\0'; - - if (remove.flags != 0) { - pr_err("no flags supported\n"); - return -EINVAL; - } - - return nvm_remove_tgt(&remove); -} - -/* kept for compatibility reasons */ -static long nvm_ioctl_dev_init(struct file *file, void __user *arg) -{ - struct nvm_ioctl_dev_init init; - - if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init))) - return -EFAULT; - - if (init.flags != 0) { - pr_err("no flags supported\n"); - return -EINVAL; - } - - return 0; -} - -/* Kept for compatibility reasons */ -static long nvm_ioctl_dev_factory(struct file *file, void __user *arg) -{ - struct nvm_ioctl_dev_factory fact; - - if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory))) - return -EFAULT; - - fact.dev[DISK_NAME_LEN - 1] = '\0'; - - if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1)) - return -EINVAL; - - return 0; -} - -static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - switch (cmd) { - case NVM_INFO: - return nvm_ioctl_info(file, argp); - case NVM_GET_DEVICES: - return nvm_ioctl_get_devices(file, argp); - case NVM_DEV_CREATE: - return nvm_ioctl_dev_create(file, argp); - case NVM_DEV_REMOVE: - return nvm_ioctl_dev_remove(file, argp); - case NVM_DEV_INIT: - return nvm_ioctl_dev_init(file, argp); - case NVM_DEV_FACTORY: - return nvm_ioctl_dev_factory(file, argp); - } - return 0; -} - -static const struct file_operations _ctl_fops = { - .open = nonseekable_open, - .unlocked_ioctl = nvm_ctl_ioctl, - .owner = THIS_MODULE, - .llseek = noop_llseek, -}; - -static struct miscdevice _nvm_misc = { - .minor = MISC_DYNAMIC_MINOR, - .name = "lightnvm", - .nodename = "lightnvm/control", - .fops = &_ctl_fops, -}; -builtin_misc_device(_nvm_misc); |