Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Matias Björling | 5107 | 72.28% | 30 | 35.71% |
Javier González | 1078 | 15.26% | 25 | 29.76% |
Rakesh Pandit | 327 | 4.63% | 6 | 7.14% |
Igor Konopko | 268 | 3.79% | 4 | 4.76% |
Hans Holmberg | 137 | 1.94% | 3 | 3.57% |
Wenwei Tao | 44 | 0.62% | 4 | 4.76% |
Minwoo Im | 40 | 0.57% | 2 | 2.38% |
Simon A. F. Lund | 28 | 0.40% | 3 | 3.57% |
Sudip Mukherjee | 14 | 0.20% | 1 | 1.19% |
Johannes Thumshirn | 12 | 0.17% | 1 | 1.19% |
Geert Uytterhoeven | 4 | 0.06% | 2 | 2.38% |
Heiner Litz | 3 | 0.04% | 1 | 1.19% |
Thomas Gleixner | 2 | 0.03% | 1 | 1.19% |
Paul Gortmaker | 2 | 0.03% | 1 | 1.19% |
Total | 7066 | 84 |
// 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 const struct block_device_operations nvm_fops = { .owner = THIS_MODULE, }; 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 request_queue *tqueue; 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 = alloc_disk(0); if (!tdisk) { ret = -ENOMEM; goto err_dev; } tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node); if (!tqueue) { ret = -ENOMEM; goto err_disk; } blk_queue_make_request(tqueue, tt->make_rq); strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name)); tdisk->flags = GENHD_FL_EXT_DEVT; tdisk->major = 0; tdisk->first_minor = 0; tdisk->fops = &nvm_fops; tdisk->queue = tqueue; targetdata = tt->init(tgt_dev, tdisk, create->flags); if (IS_ERR(targetdata)) { ret = PTR_ERR(targetdata); goto err_init; } tdisk->private_data = targetdata; tqueue->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(tqueue, 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_queue(tqueue); tdisk->queue = NULL; err_disk: put_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; struct request_queue *q = tdisk->queue; del_gendisk(tdisk); blk_cleanup_queue(q); if (tt->sysfs_exit) tt->sysfs_exit(tdisk); if (tt->exit) tt->exit(tdisk->private_data, graceful); nvm_remove_tgt_dev(t->dev, 1); put_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); if (ret) return ret; __free_page(page); 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; 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 -EFAULT; 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 > 31) { pr_err("max 31 devices can be reported.\n"); 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);
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