/* * Copyright (C) 2015 IT University of Copenhagen. All rights reserved. * Initial release: Matias Bjorling * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, * USA. * */ #include #include #include #include #include #include #include #include #include #include #include static LIST_HEAD(nvm_targets); static LIST_HEAD(nvm_mgrs); static LIST_HEAD(nvm_devices); static DECLARE_RWSEM(nvm_lock); static struct nvm_tgt_type *nvm_find_target_type(const char *name) { struct nvm_tgt_type *tt; list_for_each_entry(tt, &nvm_targets, list) if (!strcmp(name, tt->name)) return tt; return NULL; } int nvm_register_target(struct nvm_tgt_type *tt) { int ret = 0; down_write(&nvm_lock); if (nvm_find_target_type(tt->name)) ret = -EEXIST; else list_add(&tt->list, &nvm_targets); up_write(&nvm_lock); return ret; } EXPORT_SYMBOL(nvm_register_target); void nvm_unregister_target(struct nvm_tgt_type *tt) { if (!tt) return; down_write(&nvm_lock); list_del(&tt->list); up_write(&nvm_lock); } EXPORT_SYMBOL(nvm_unregister_target); 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->ppalist_pool, mem_flags, dma_handler); } EXPORT_SYMBOL(nvm_dev_dma_alloc); void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list, dma_addr_t dma_handler) { dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler); } EXPORT_SYMBOL(nvm_dev_dma_free); static struct nvmm_type *nvm_find_mgr_type(const char *name) { struct nvmm_type *mt; list_for_each_entry(mt, &nvm_mgrs, list) if (!strcmp(name, mt->name)) return mt; return NULL; } struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev) { struct nvmm_type *mt; int ret; lockdep_assert_held(&nvm_lock); list_for_each_entry(mt, &nvm_mgrs, list) { if (strncmp(dev->sb.mmtype, mt->name, NVM_MMTYPE_LEN)) continue; ret = mt->register_mgr(dev); if (ret < 0) { pr_err("nvm: media mgr failed to init (%d) on dev %s\n", ret, dev->name); return NULL; /* initialization failed */ } else if (ret > 0) return mt; } return NULL; } int nvm_register_mgr(struct nvmm_type *mt) { struct nvm_dev *dev; int ret = 0; down_write(&nvm_lock); if (nvm_find_mgr_type(mt->name)) { ret = -EEXIST; goto finish; } else { list_add(&mt->list, &nvm_mgrs); } /* try to register media mgr if any device have none configured */ list_for_each_entry(dev, &nvm_devices, devices) { if (dev->mt) continue; dev->mt = nvm_init_mgr(dev); } finish: up_write(&nvm_lock); return ret; } EXPORT_SYMBOL(nvm_register_mgr); void nvm_unregister_mgr(struct nvmm_type *mt) { if (!mt) return; down_write(&nvm_lock); list_del(&mt->list); up_write(&nvm_lock); } EXPORT_SYMBOL(nvm_unregister_mgr); 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; } struct nvm_block *nvm_get_blk_unlocked(struct nvm_dev *dev, struct nvm_lun *lun, unsigned long flags) { return dev->mt->get_blk_unlocked(dev, lun, flags); } EXPORT_SYMBOL(nvm_get_blk_unlocked); /* Assumes that all valid pages have already been moved on release to bm */ void nvm_put_blk_unlocked(struct nvm_dev *dev, struct nvm_block *blk) { return dev->mt->put_blk_unlocked(dev, blk); } EXPORT_SYMBOL(nvm_put_blk_unlocked); struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun, unsigned long flags) { return dev->mt->get_blk(dev, lun, flags); } EXPORT_SYMBOL(nvm_get_blk); /* Assumes that all valid pages have already been moved on release to bm */ void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk) { return dev->mt->put_blk(dev, blk); } EXPORT_SYMBOL(nvm_put_blk); int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) { return dev->mt->submit_io(dev, rqd); } EXPORT_SYMBOL(nvm_submit_io); int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk) { return dev->mt->erase_blk(dev, blk, 0); } EXPORT_SYMBOL(nvm_erase_blk); void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd) { int i; if (rqd->nr_pages > 1) { for (i = 0; i < rqd->nr_pages; i++) rqd->ppa_list[i] = dev_to_generic_addr(dev, rqd->ppa_list[i]); } else { rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr); } } EXPORT_SYMBOL(nvm_addr_to_generic_mode); void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd) { int i; if (rqd->nr_pages > 1) { for (i = 0; i < rqd->nr_pages; i++) rqd->ppa_list[i] = generic_to_dev_addr(dev, rqd->ppa_list[i]); } else { rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr); } } EXPORT_SYMBOL(nvm_generic_to_addr_mode); int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd, struct ppa_addr *ppas, int nr_ppas) { int i, plane_cnt, pl_idx; if (dev->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) { rqd->nr_pages = 1; rqd->ppa_addr = ppas[0]; return 0; } plane_cnt = dev->plane_mode; rqd->nr_pages = plane_cnt * nr_ppas; if (dev->ops->max_phys_sect < rqd->nr_pages) return -EINVAL; rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); if (!rqd->ppa_list) { pr_err("nvm: failed to allocate dma memory\n"); return -ENOMEM; } for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { for (i = 0; i < nr_ppas; i++) { ppas[i].g.pl = pl_idx; rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppas[i]; } } return 0; } EXPORT_SYMBOL(nvm_set_rqd_ppalist); void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd) { if (!rqd->ppa_list) return; nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list); } EXPORT_SYMBOL(nvm_free_rqd_ppalist); int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas) { struct nvm_rq rqd; int ret; if (!dev->ops->erase_block) return 0; memset(&rqd, 0, sizeof(struct nvm_rq)); ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas); if (ret) return ret; nvm_generic_to_addr_mode(dev, &rqd); ret = dev->ops->erase_block(dev, &rqd); nvm_free_rqd_ppalist(dev, &rqd); return ret; } EXPORT_SYMBOL(nvm_erase_ppa); void nvm_end_io(struct nvm_rq *rqd, int error) { rqd->error = error; rqd->end_io(rqd); } EXPORT_SYMBOL(nvm_end_io); static void nvm_end_io_sync(struct nvm_rq *rqd) { struct completion *waiting = rqd->wait; rqd->wait = NULL; complete(waiting); } int nvm_submit_ppa(struct nvm_dev *dev, struct ppa_addr *ppa, int nr_ppas, int opcode, int flags, void *buf, int len) { DECLARE_COMPLETION_ONSTACK(wait); struct nvm_rq rqd; struct bio *bio; int ret; unsigned long hang_check; bio = bio_map_kern(dev->q, buf, len, GFP_KERNEL); if (IS_ERR_OR_NULL(bio)) return -ENOMEM; memset(&rqd, 0, sizeof(struct nvm_rq)); ret = nvm_set_rqd_ppalist(dev, &rqd, ppa, nr_ppas); if (ret) { bio_put(bio); return ret; } rqd.opcode = opcode; rqd.bio = bio; rqd.wait = &wait; rqd.dev = dev; rqd.end_io = nvm_end_io_sync; rqd.flags = flags; nvm_generic_to_addr_mode(dev, &rqd); ret = dev->ops->submit_io(dev, &rqd); /* Prevent hang_check timer from firing at us during very long I/O */ hang_check = sysctl_hung_task_timeout_secs; if (hang_check) while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2))); else wait_for_completion_io(&wait); nvm_free_rqd_ppalist(dev, &rqd); return rqd.error; } EXPORT_SYMBOL(nvm_submit_ppa); static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp) { int i; dev->lps_per_blk = dev->pgs_per_blk; dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL); if (!dev->lptbl) return -ENOMEM; /* Just a linear array */ for (i = 0; i < dev->lps_per_blk; i++) dev->lptbl[i] = i; return 0; } static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp) { int i, p; struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc; if (!mlc->num_pairs) return 0; dev->lps_per_blk = mlc->num_pairs; dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL); if (!dev->lptbl) return -ENOMEM; /* The lower page table encoding consists of a list of bytes, where each * has a lower and an upper half. The first half byte maintains the * increment value and every value after is an offset added to the * previous incrementation value */ dev->lptbl[0] = mlc->pairs[0] & 0xF; for (i = 1; i < dev->lps_per_blk; i++) { p = mlc->pairs[i >> 1]; if (i & 0x1) /* upper */ dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4); else /* lower */ dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF); } return 0; } static int nvm_core_init(struct nvm_dev *dev) { struct nvm_id *id = &dev->identity; struct nvm_id_group *grp = &id->groups[0]; /* device values */ dev->nr_chnls = grp->num_ch; dev->luns_per_chnl = grp->num_lun; dev->pgs_per_blk = grp->num_pg; dev->blks_per_lun = grp->num_blk; dev->nr_planes = grp->num_pln; dev->sec_size = grp->csecs; dev->oob_size = grp->sos; dev->sec_per_pg = grp->fpg_sz / grp->csecs; dev->mccap = grp->mccap; memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format)); dev->plane_mode = NVM_PLANE_SINGLE; dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size; if (grp->mtype != 0) { pr_err("nvm: memory type not supported\n"); return -EINVAL; } switch (grp->fmtype) { case NVM_ID_FMTYPE_SLC: if (nvm_init_slc_tbl(dev, grp)) return -ENOMEM; break; case NVM_ID_FMTYPE_MLC: if (nvm_init_mlc_tbl(dev, grp)) return -ENOMEM; break; default: pr_err("nvm: flash type not supported\n"); return -EINVAL; } if (!dev->lps_per_blk) pr_info("nvm: lower page programming table missing\n"); if (grp->mpos & 0x020202) dev->plane_mode = NVM_PLANE_DOUBLE; if (grp->mpos & 0x040404) dev->plane_mode = NVM_PLANE_QUAD; /* calculated values */ dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes; dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk; dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun; dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls; dev->total_blocks = dev->nr_planes * dev->blks_per_lun * dev->luns_per_chnl * dev->nr_chnls; dev->total_secs = dev->total_blocks * dev->sec_per_blk; INIT_LIST_HEAD(&dev->online_targets); mutex_init(&dev->mlock); return 0; } static void nvm_free(struct nvm_dev *dev) { if (!dev) return; if (dev->mt) dev->mt->unregister_mgr(dev); kfree(dev->lptbl); } static int nvm_init(struct nvm_dev *dev) { int ret = -EINVAL; if (!dev->q || !dev->ops) return ret; if (dev->ops->identity(dev, &dev->identity)) { pr_err("nvm: device could not be identified\n"); goto err; } pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n", dev->identity.ver_id, dev->identity.vmnt, dev->identity.cgrps); if (dev->identity.ver_id != 1) { pr_err("nvm: device not supported by kernel."); goto err; } if (dev->identity.cgrps != 1) { pr_err("nvm: only one group configuration supported."); goto err; } ret = nvm_core_init(dev); if (ret) { pr_err("nvm: could not initialize core structures.\n"); goto err; } pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n", dev->name, dev->sec_per_pg, dev->nr_planes, dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns, dev->nr_chnls); return 0; err: pr_err("nvm: failed to initialize nvm\n"); return ret; } static void nvm_exit(struct nvm_dev *dev) { if (dev->ppalist_pool) dev->ops->destroy_dma_pool(dev->ppalist_pool); nvm_free(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 *dev; int ret; if (!ops->identity) return -EINVAL; dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL); if (!dev) return -ENOMEM; dev->q = q; dev->ops = ops; strncpy(dev->name, disk_name, DISK_NAME_LEN); ret = nvm_init(dev); if (ret) goto err_init; if (dev->ops->max_phys_sect > 256) { pr_info("nvm: max sectors supported is 256.\n"); ret = -EINVAL; goto err_init; } if (dev->ops->max_phys_sect > 1) { dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist"); if (!dev->ppalist_pool) { pr_err("nvm: could not create ppa pool\n"); ret = -ENOMEM; goto err_init; } } ret = nvm_get_sysblock(dev, &dev->sb); if (!ret) pr_err("nvm: device not initialized.\n"); else if (ret < 0) pr_err("nvm: err (%d) on device initialization\n", ret); /* register device with a supported media manager */ down_write(&nvm_lock); if (ret > 0) dev->mt = nvm_init_mgr(dev); list_add(&dev->devices, &nvm_devices); up_write(&nvm_lock); return 0; err_init: kfree(dev); return ret; } EXPORT_SYMBOL(nvm_register); void nvm_unregister(char *disk_name) { 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); static const struct block_device_operations nvm_fops = { .owner = THIS_MODULE, }; static int nvm_create_target(struct nvm_dev *dev, struct nvm_ioctl_create *create) { struct nvm_ioctl_create_simple *s = &create->conf.s; struct request_queue *tqueue; struct gendisk *tdisk; struct nvm_tgt_type *tt; struct nvm_target *t; void *targetdata; if (!dev->mt) { pr_info("nvm: device has no media manager registered.\n"); return -ENODEV; } down_write(&nvm_lock); tt = nvm_find_target_type(create->tgttype); if (!tt) { pr_err("nvm: target type %s not found\n", create->tgttype); up_write(&nvm_lock); return -EINVAL; } list_for_each_entry(t, &dev->online_targets, list) { if (!strcmp(create->tgtname, t->disk->disk_name)) { pr_err("nvm: target name already exists.\n"); up_write(&nvm_lock); return -EINVAL; } } up_write(&nvm_lock); t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); if (!t) return -ENOMEM; tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node); if (!tqueue) goto err_t; blk_queue_make_request(tqueue, tt->make_rq); tdisk = alloc_disk(0); if (!tdisk) goto err_queue; sprintf(tdisk->disk_name, "%s", create->tgtname); tdisk->flags = GENHD_FL_EXT_DEVT; tdisk->major = 0; tdisk->first_minor = 0; tdisk->fops = &nvm_fops; tdisk->queue = tqueue; targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end); if (IS_ERR(targetdata)) goto err_init; tdisk->private_data = targetdata; tqueue->queuedata = targetdata; blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect); set_capacity(tdisk, tt->capacity(targetdata)); add_disk(tdisk); t->type = tt; t->disk = tdisk; down_write(&nvm_lock); list_add_tail(&t->list, &dev->online_targets); up_write(&nvm_lock); return 0; err_init: put_disk(tdisk); err_queue: blk_cleanup_queue(tqueue); err_t: kfree(t); return -ENOMEM; } static void nvm_remove_target(struct nvm_target *t) { struct nvm_tgt_type *tt = t->type; struct gendisk *tdisk = t->disk; struct request_queue *q = tdisk->queue; lockdep_assert_held(&nvm_lock); del_gendisk(tdisk); blk_cleanup_queue(q); if (tt->exit) tt->exit(tdisk->private_data); put_disk(tdisk); list_del(&t->list); kfree(t); } static int __nvm_configure_create(struct nvm_ioctl_create *create) { struct nvm_dev *dev; struct nvm_ioctl_create_simple *s; down_write(&nvm_lock); dev = nvm_find_nvm_dev(create->dev); up_write(&nvm_lock); if (!dev) { pr_err("nvm: device not found\n"); return -EINVAL; } if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) { pr_err("nvm: config type not valid\n"); return -EINVAL; } s = &create->conf.s; if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) { pr_err("nvm: lun out of bound (%u:%u > %u)\n", s->lun_begin, s->lun_end, dev->nr_luns); return -EINVAL; } return nvm_create_target(dev, create); } static int __nvm_configure_remove(struct nvm_ioctl_remove *remove) { struct nvm_target *t = NULL; struct nvm_dev *dev; int ret = -1; down_write(&nvm_lock); list_for_each_entry(dev, &nvm_devices, devices) list_for_each_entry(t, &dev->online_targets, list) { if (!strcmp(remove->tgtname, t->disk->disk_name)) { nvm_remove_target(t); ret = 0; break; } } up_write(&nvm_lock); if (ret) { pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname); return -EINVAL; } return 0; } #ifdef CONFIG_NVM_DEBUG static int nvm_configure_show(const char *val) { struct nvm_dev *dev; char opcode, devname[DISK_NAME_LEN]; int ret; ret = sscanf(val, "%c %32s", &opcode, devname); if (ret != 2) { pr_err("nvm: invalid command. Use \"opcode devicename\".\n"); return -EINVAL; } down_write(&nvm_lock); dev = nvm_find_nvm_dev(devname); up_write(&nvm_lock); if (!dev) { pr_err("nvm: device not found\n"); return -EINVAL; } if (!dev->mt) return 0; dev->mt->lun_info_print(dev); return 0; } static int nvm_configure_remove(const char *val) { struct nvm_ioctl_remove remove; char opcode; int ret; ret = sscanf(val, "%c %256s", &opcode, remove.tgtname); if (ret != 2) { pr_err("nvm: invalid command. Use \"d targetname\".\n"); return -EINVAL; } remove.flags = 0; return __nvm_configure_remove(&remove); } static int nvm_configure_create(const char *val) { struct nvm_ioctl_create create; char opcode; int lun_begin, lun_end, ret; ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev, create.tgtname, create.tgttype, &lun_begin, &lun_end); if (ret != 6) { pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n"); return -EINVAL; } create.flags = 0; create.conf.type = NVM_CONFIG_TYPE_SIMPLE; create.conf.s.lun_begin = lun_begin; create.conf.s.lun_end = lun_end; return __nvm_configure_create(&create); } /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */ static int nvm_configure_by_str_event(const char *val, const struct kernel_param *kp) { char opcode; int ret; ret = sscanf(val, "%c", &opcode); if (ret != 1) { pr_err("nvm: string must have the format of \"cmd ...\"\n"); return -EINVAL; } switch (opcode) { case 'a': return nvm_configure_create(val); case 'd': return nvm_configure_remove(val); case 's': return nvm_configure_show(val); default: pr_err("nvm: invalid command\n"); return -EINVAL; } return 0; } static int nvm_configure_get(char *buf, const struct kernel_param *kp) { int sz; struct nvm_dev *dev; sz = sprintf(buf, "available devices:\n"); down_write(&nvm_lock); list_for_each_entry(dev, &nvm_devices, devices) { if (sz > 4095 - DISK_NAME_LEN - 2) break; sz += sprintf(buf + sz, " %32s\n", dev->name); } up_write(&nvm_lock); return sz; } static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = { .set = nvm_configure_by_str_event, .get = nvm_configure_get, }; #undef MODULE_PARAM_PREFIX #define MODULE_PARAM_PREFIX "lnvm." module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL, 0644); #endif /* CONFIG_NVM_DEBUG */ 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; if (!capable(CAP_SYS_ADMIN)) return -EPERM; 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_lock); list_for_each_entry(tt, &nvm_targets, 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_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; if (!capable(CAP_SYS_ADMIN)) return -EPERM; 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]; sprintf(info->devname, "%s", dev->name); if (dev->mt) { info->bmversion[0] = dev->mt->version[0]; info->bmversion[1] = dev->mt->version[1]; info->bmversion[2] = dev->mt->version[2]; sprintf(info->bmname, "%s", dev->mt->name); } else { sprintf(info->bmname, "none"); } i++; if (i > 31) { pr_err("nvm: 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 (!capable(CAP_SYS_ADMIN)) return -EPERM; if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) return -EFAULT; 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) { pr_err("nvm: no flags 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 (!capable(CAP_SYS_ADMIN)) return -EPERM; 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("nvm: no flags supported\n"); return -EINVAL; } return __nvm_configure_remove(&remove); } static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info) { info->seqnr = 1; info->erase_cnt = 0; info->version = 1; } static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init) { struct nvm_dev *dev; struct nvm_sb_info info; int ret; down_write(&nvm_lock); dev = nvm_find_nvm_dev(init->dev); up_write(&nvm_lock); if (!dev) { pr_err("nvm: device not found\n"); return -EINVAL; } nvm_setup_nvm_sb_info(&info); strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN); info.fs_ppa.ppa = -1; ret = nvm_init_sysblock(dev, &info); if (ret) return ret; memcpy(&dev->sb, &info, sizeof(struct nvm_sb_info)); down_write(&nvm_lock); dev->mt = nvm_init_mgr(dev); up_write(&nvm_lock); return 0; } static long nvm_ioctl_dev_init(struct file *file, void __user *arg) { struct nvm_ioctl_dev_init init; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init))) return -EFAULT; if (init.flags != 0) { pr_err("nvm: no flags supported\n"); return -EINVAL; } init.dev[DISK_NAME_LEN - 1] = '\0'; return __nvm_ioctl_dev_init(&init); } static long nvm_ioctl_dev_factory(struct file *file, void __user *arg) { struct nvm_ioctl_dev_factory fact; struct nvm_dev *dev; if (!capable(CAP_SYS_ADMIN)) return -EPERM; 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; down_write(&nvm_lock); dev = nvm_find_nvm_dev(fact.dev); up_write(&nvm_lock); if (!dev) { pr_err("nvm: device not found\n"); return -EINVAL; } if (dev->mt) { dev->mt->unregister_mgr(dev); dev->mt = NULL; } return nvm_dev_factory(dev, fact.flags); } static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) { void __user *argp = (void __user *)arg; 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, }; MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR); static int __init nvm_mod_init(void) { int ret; ret = misc_register(&_nvm_misc); if (ret) pr_err("nvm: misc_register failed for control device"); return ret; } static void __exit nvm_mod_exit(void) { misc_deregister(&_nvm_misc); } MODULE_AUTHOR("Matias Bjorling "); MODULE_LICENSE("GPL v2"); MODULE_VERSION("0.1"); module_init(nvm_mod_init); module_exit(nvm_mod_exit);