diff options
Diffstat (limited to 'drivers/lightnvm')
| -rw-r--r-- | drivers/lightnvm/Kconfig | 42 | ||||
| -rw-r--r-- | drivers/lightnvm/Makefile | 7 | ||||
| -rw-r--r-- | drivers/lightnvm/core.c | 826 | ||||
| -rw-r--r-- | drivers/lightnvm/gennvm.c | 485 | ||||
| -rw-r--r-- | drivers/lightnvm/gennvm.h | 46 | ||||
| -rw-r--r-- | drivers/lightnvm/rrpc.c | 1323 | ||||
| -rw-r--r-- | drivers/lightnvm/rrpc.h | 239 |
7 files changed, 2968 insertions, 0 deletions
diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig new file mode 100644 index 000000000000..a16bf56d3f28 --- /dev/null +++ b/drivers/lightnvm/Kconfig @@ -0,0 +1,42 @@ +# +# Open-Channel SSD NVM configuration +# + +menuconfig NVM + bool "Open-Channel SSD target support" + depends on BLOCK + help + Say Y here to get to enable Open-channel SSDs. + + Open-Channel SSDs implement a set of extension to SSDs, that + exposes direct access to the underlying non-volatile memory. + + If you say N, all options in this submenu will be skipped and disabled + only do this if you know what you are doing. + +if NVM + +config NVM_DEBUG + bool "Open-Channel SSD debugging support" + ---help--- + Exposes a debug management interface to create/remove targets at: + + /sys/module/lnvm/parameters/configure_debug + + It is required to create/remove targets without IOCTLs. + +config NVM_GENNVM + tristate "Generic NVM manager for Open-Channel SSDs" + ---help--- + NVM media manager for Open-Channel SSDs that offload management + functionality to device, while keeping data placement and garbage + collection decisions on the host. + +config NVM_RRPC + tristate "Round-robin Hybrid Open-Channel SSD target" + ---help--- + Allows an open-channel SSD to be exposed as a block device to the + host. The target is implemented using a linear mapping table and + cost-based garbage collection. It is optimized for 4K IO sizes. + +endif # NVM diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile new file mode 100644 index 000000000000..7e0f42acb737 --- /dev/null +++ b/drivers/lightnvm/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for Open-Channel SSDs. +# + +obj-$(CONFIG_NVM) := core.o +obj-$(CONFIG_NVM_GENNVM) += gennvm.o +obj-$(CONFIG_NVM_RRPC) += rrpc.o diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c new file mode 100644 index 000000000000..f659e605a406 --- /dev/null +++ b/drivers/lightnvm/core.c @@ -0,0 +1,826 @@ +/* + * Copyright (C) 2015 IT University of Copenhagen. All rights reserved. + * Initial release: Matias Bjorling <m@bjorling.me> + * + * 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 <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/list.h> +#include <linux/types.h> +#include <linux/sem.h> +#include <linux/bitmap.h> +#include <linux/module.h> +#include <linux/miscdevice.h> +#include <linux/lightnvm.h> +#include <uapi/linux/lightnvm.h> + +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->q, 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; +} + +int nvm_register_mgr(struct nvmm_type *mt) +{ + int ret = 0; + + down_write(&nvm_lock); + if (nvm_find_mgr_type(mt->name)) + ret = -EEXIST; + else + list_add(&mt->list, &nvm_mgrs); + 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(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); + +static void nvm_core_free(struct nvm_dev *dev) +{ + kfree(dev); +} + +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->addr_mode = id->ppat; + dev->addr_format = id->ppaf; + + dev->plane_mode = NVM_PLANE_SINGLE; + dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size; + + 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_pages = dev->total_blocks * dev->pgs_per_blk; + INIT_LIST_HEAD(&dev->online_targets); + + return 0; +} + +static void nvm_free(struct nvm_dev *dev) +{ + if (!dev) + return; + + if (dev->mt) + dev->mt->unregister_mgr(dev); + + nvm_core_free(dev); +} + +static int nvm_init(struct nvm_dev *dev) +{ + struct nvmm_type *mt; + int ret = 0; + + if (!dev->q || !dev->ops) + return -EINVAL; + + if (dev->ops->identity(dev->q, &dev->identity)) { + pr_err("nvm: device could not be identified\n"); + ret = -EINVAL; + 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; + } + + /* register with device with a supported manager */ + list_for_each_entry(mt, &nvm_mgrs, list) { + ret = mt->register_mgr(dev); + if (ret < 0) + goto err; /* initialization failed */ + if (ret > 0) { + dev->mt = mt; + break; /* successfully initialized */ + } + } + + if (!ret) { + pr_info("nvm: no compatible manager found.\n"); + return 0; + } + + 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: + nvm_free(dev); + 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; + + down_write(&nvm_lock); + list_add(&dev->devices, &nvm_devices); + up_write(&nvm_lock); + + if (dev->ops->max_phys_sect > 1) { + dev->ppalist_pool = dev->ops->create_dma_pool(dev->q, + "ppalist"); + if (!dev->ppalist_pool) { + pr_err("nvm: could not create ppa pool\n"); + return -ENOMEM; + } + } else if (dev->ops->max_phys_sect > 256) { + pr_info("nvm: max sectors supported is 256.\n"); + return -EINVAL; + } + + return 0; +err_init: + kfree(dev); + return ret; +} +EXPORT_SYMBOL(nvm_register); + +void nvm_unregister(char *disk_name) +{ + struct nvm_dev *dev = nvm_find_nvm_dev(disk_name); + + if (!dev) { + pr_err("nvm: could not find device %s to unregister\n", + disk_name); + return; + } + + nvm_exit(dev); + + down_write(&nvm_lock); + list_del(&dev->devices); + up_write(&nvm_lock); +} +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 nvmm_type *mt; + struct gendisk *tdisk; + struct nvm_tgt_type *tt; + struct nvm_target *t; + void *targetdata; + int ret = 0; + + if (!dev->mt) { + /* register with device with a supported NVM manager */ + list_for_each_entry(mt, &nvm_mgrs, list) { + ret = mt->register_mgr(dev); + if (ret < 0) + return ret; /* initialization failed */ + if (ret > 0) { + dev->mt = mt; + break; /* successfully initialized */ + } + } + + if (!ret) { + pr_info("nvm: no compatible nvm manager found.\n"); + return -ENODEV; + } + } + + tt = nvm_find_target_type(create->tgttype); + if (!tt) { + pr_err("nvm: target type %s not found\n", create->tgttype); + return -EINVAL; + } + + down_write(&nvm_lock); + 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); + if (tt->exit) + tt->exit(tdisk->private_data); + + blk_cleanup_queue(q); + + 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; + + dev = nvm_find_nvm_dev(create->dev); + 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; + } + + dev = nvm_find_nvm_dev(devname); + if (!dev) { + pr_err("nvm: device not found\n"); + return -EINVAL; + } + + if (!dev->mt) + return 0; + + dev->mt->free_blocks_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 = 0; + char *buf_start = buf; + struct nvm_dev *dev; + + buf += sprintf(buf, "available devices:\n"); + down_write(&nvm_lock); + list_for_each_entry(dev, &nvm_devices, devices) { + if (sz > 4095 - DISK_NAME_LEN) + break; + buf += sprintf(buf, " %32s\n", dev->name); + } + up_write(&nvm_lock); + + return buf - buf_start - 1; +} + +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))) + 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))) + 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 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); + } + 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 <m@bjorling.me>"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION("0.1"); +module_init(nvm_mod_init); +module_exit(nvm_mod_exit); diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c new file mode 100644 index 000000000000..ae1fb2bdc5f4 --- /dev/null +++ b/drivers/lightnvm/gennvm.c @@ -0,0 +1,485 @@ +/* + * Copyright (C) 2015 Matias Bjorling <m@bjorling.me> + * + * 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. + * + * Implementation of a generic nvm manager for Open-Channel SSDs. + */ + +#include "gennvm.h" + +static void gennvm_blocks_free(struct nvm_dev *dev) +{ + struct gen_nvm *gn = dev->mp; + struct gen_lun *lun; + int i; + + gennvm_for_each_lun(gn, lun, i) { + if (!lun->vlun.blocks) + break; + vfree(lun->vlun.blocks); + } +} + +static void gennvm_luns_free(struct nvm_dev *dev) +{ + struct gen_nvm *gn = dev->mp; + + kfree(gn->luns); +} + +static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn) +{ + struct gen_lun *lun; + int i; + + gn->luns = kcalloc(dev->nr_luns, sizeof(struct gen_lun), GFP_KERNEL); + if (!gn->luns) + return -ENOMEM; + + gennvm_for_each_lun(gn, lun, i) { + spin_lock_init(&lun->vlun.lock); + INIT_LIST_HEAD(&lun->free_list); + INIT_LIST_HEAD(&lun->used_list); + INIT_LIST_HEAD(&lun->bb_list); + + lun->reserved_blocks = 2; /* for GC only */ + lun->vlun.id = i; + lun->vlun.lun_id = i % dev->luns_per_chnl; + lun->vlun.chnl_id = i / dev->luns_per_chnl; + lun->vlun.nr_free_blocks = dev->blks_per_lun; + } + return 0; +} + +static int gennvm_block_bb(u32 lun_id, void *bb_bitmap, unsigned int nr_blocks, + void *private) +{ + struct gen_nvm *gn = private; + struct gen_lun *lun = &gn->luns[lun_id]; + struct nvm_block *blk; + int i; + + if (unlikely(bitmap_empty(bb_bitmap, nr_blocks))) + return 0; + + i = -1; + while ((i = find_next_bit(bb_bitmap, nr_blocks, i + 1)) < nr_blocks) { + blk = &lun->vlun.blocks[i]; + if (!blk) { + pr_err("gennvm: BB data is out of bounds.\n"); + return -EINVAL; + } + + list_move_tail(&blk->list, &lun->bb_list); + } + + return 0; +} + +static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private) +{ + struct nvm_dev *dev = private; + struct gen_nvm *gn = dev->mp; + sector_t max_pages = dev->total_pages * (dev->sec_size >> 9); + u64 elba = slba + nlb; + struct gen_lun *lun; + struct nvm_block *blk; + u64 i; + int lun_id; + + if (unlikely(elba > dev->total_pages)) { + pr_err("gennvm: L2P data from device is out of bounds!\n"); + return -EINVAL; + } + + for (i = 0; i < nlb; i++) { + u64 pba = le64_to_cpu(entries[i]); + + if (unlikely(pba >= max_pages && pba != U64_MAX)) { + pr_err("gennvm: L2P data entry is out of bounds!\n"); + return -EINVAL; + } + + /* Address zero is a special one. The first page on a disk is + * protected. It often holds internal device boot + * information. + */ + if (!pba) + continue; + + /* resolve block from physical address */ + lun_id = div_u64(pba, dev->sec_per_lun); + lun = &gn->luns[lun_id]; + + /* Calculate block offset into lun */ + pba = pba - (dev->sec_per_lun * lun_id); + blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)]; + + if (!blk->type) { + /* at this point, we don't know anything about the + * block. It's up to the FTL on top to re-etablish the + * block state + */ + list_move_tail(&blk->list, &lun->used_list); + blk->type = 1; + lun->vlun.nr_free_blocks--; + } + } + + return 0; +} + +static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn) +{ + struct gen_lun *lun; + struct nvm_block *block; + sector_t lun_iter, blk_iter, cur_block_id = 0; + int ret; + + gennvm_for_each_lun(gn, lun, lun_iter) { + lun->vlun.blocks = vzalloc(sizeof(struct nvm_block) * + dev->blks_per_lun); + if (!lun->vlun.blocks) + return -ENOMEM; + + for (blk_iter = 0; blk_iter < dev->blks_per_lun; blk_iter++) { + block = &lun->vlun.blocks[blk_iter]; + + INIT_LIST_HEAD(&block->list); + + block->lun = &lun->vlun; + block->id = cur_block_id++; + + /* First block is reserved for device */ + if (unlikely(lun_iter == 0 && blk_iter == 0)) + continue; + + list_add_tail(&block->list, &lun->free_list); + } + + if (dev->ops->get_bb_tbl) { + ret = dev->ops->get_bb_tbl(dev->q, lun->vlun.id, + dev->blks_per_lun, gennvm_block_bb, gn); + if (ret) + pr_err("gennvm: could not read BB table\n"); + } + } + + if (dev->ops->get_l2p_tbl) { + ret = dev->ops->get_l2p_tbl(dev->q, 0, dev->total_pages, + gennvm_block_map, dev); + if (ret) { + pr_err("gennvm: could not read L2P table.\n"); + pr_warn("gennvm: default block initialization"); + } + } + + return 0; +} + +static int gennvm_register(struct nvm_dev *dev) +{ + struct gen_nvm *gn; + int ret; + + gn = kzalloc(sizeof(struct gen_nvm), GFP_KERNEL); + if (!gn) + return -ENOMEM; + + gn->nr_luns = dev->nr_luns; + dev->mp = gn; + + ret = gennvm_luns_init(dev, gn); + if (ret) { + pr_err("gennvm: could not initialize luns\n"); + goto err; + } + + ret = gennvm_blocks_init(dev, gn); + if (ret) { + pr_err("gennvm: could not initialize blocks\n"); + goto err; + } + + return 1; +err: + kfree(gn); + return ret; +} + +static void gennvm_unregister(struct nvm_dev *dev) +{ + gennvm_blocks_free(dev); + gennvm_luns_free(dev); + kfree(dev->mp); + dev->mp = NULL; +} + +static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev, + struct nvm_lun *vlun, unsigned long flags) +{ + struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun); + struct nvm_block *blk = NULL; + int is_gc = flags & NVM_IOTYPE_GC; + + spin_lock(&vlun->lock); + + if (list_empty(&lun->free_list)) { + pr_err_ratelimited("gennvm: lun %u have no free pages available", + lun->vlun.id); + spin_unlock(&vlun->lock); + goto out; + } + + while (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks) { + spin_unlock(&vlun->lock); + goto out; + } + + blk = list_first_entry(&lun->free_list, struct nvm_block, list); + list_move_tail(&blk->list, &lun->used_list); + blk->type = 1; + + lun->vlun.nr_free_blocks--; + + spin_unlock(&vlun->lock); +out: + return blk; +} + +static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk) +{ + struct nvm_lun *vlun = blk->lun; + struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun); + + spin_lock(&vlun->lock); + + switch (blk->type) { + case 1: + list_move_tail(&blk->list, &lun->free_list); + lun->vlun.nr_free_blocks++; + blk->type = 0; + break; + case 2: + list_move_tail(&blk->list, &lun->bb_list); + break; + default: + WARN_ON_ONCE(1); + pr_err("gennvm: erroneous block type (%lu -> %u)\n", + blk->id, blk->type); + list_move_tail(&blk->list, &lun->bb_list); + } + + spin_unlock(&vlun->lock); +} + +static void gennvm_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] = addr_to_generic_mode(dev, + rqd->ppa_list[i]); + } else { + rqd->ppa_addr = addr_to_generic_mode(dev, rqd->ppa_addr); + } +} + +static void gennvm_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_addr_mode(dev, + rqd->ppa_list[i]); + } else { + rqd->ppa_addr = generic_to_addr_mode(dev, rqd->ppa_addr); + } +} + +static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) +{ + if (!dev->ops->submit_io) + return 0; + + /* Convert address space */ + gennvm_generic_to_addr_mode(dev, rqd); + + rqd->dev = dev; + return dev->ops->submit_io(dev->q, rqd); +} + +static void gennvm_blk_set_type(struct nvm_dev *dev, struct ppa_addr *ppa, + int type) +{ + struct gen_nvm *gn = dev->mp; + struct gen_lun *lun; + struct nvm_block *blk; + + if (unlikely(ppa->g.ch > dev->nr_chnls || + ppa->g.lun > dev->luns_per_chnl || + ppa->g.blk > dev->blks_per_lun)) { + WARN_ON_ONCE(1); + pr_err("gennvm: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u", + ppa->g.ch, dev->nr_chnls, + ppa->g.lun, dev->luns_per_chnl, + ppa->g.blk, dev->blks_per_lun); + return; + } + + lun = &gn->luns[ppa->g.lun * ppa->g.ch]; + blk = &lun->vlun.blocks[ppa->g.blk]; + + /* will be moved to bb list on put_blk from target */ + blk->type = type; +} + +/* mark block bad. It is expected the target recover from the error. */ +static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd) +{ + int i; + + if (!dev->ops->set_bb) + return; + + if (dev->ops->set_bb(dev->q, rqd, 1)) + return; + + gennvm_addr_to_generic_mode(dev, rqd); + + /* look up blocks and mark them as bad */ + if (rqd->nr_pages > 1) + for (i = 0; i < rqd->nr_pages; i++) + gennvm_blk_set_type(dev, &rqd->ppa_list[i], 2); + else + gennvm_blk_set_type(dev, &rqd->ppa_addr, 2); +} + +static int gennvm_end_io(struct nvm_rq *rqd, int error) +{ + struct nvm_tgt_instance *ins = rqd->ins; + int ret = 0; + + switch (error) { + case NVM_RSP_SUCCESS: + break; + case NVM_RSP_ERR_EMPTYPAGE: + break; + case NVM_RSP_ERR_FAILWRITE: + gennvm_mark_blk_bad(rqd->dev, rqd); + default: + ret++; + } + + ret += ins->tt->end_io(rqd, error); + + return ret; +} + +static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk, + unsigned long flags) +{ + int plane_cnt = 0, pl_idx, ret; + struct ppa_addr addr; + struct nvm_rq rqd; + + if (!dev->ops->erase_block) + return 0; + + addr = block_to_ppa(dev, blk); + + if (dev->plane_mode == NVM_PLANE_SINGLE) { + rqd.nr_pages = 1; + rqd.ppa_addr = addr; + } else { + plane_cnt = (1 << dev->plane_mode); + rqd.nr_pages = plane_cnt; + + rqd.ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, + &rqd.dma_ppa_list); + if (!rqd.ppa_list) { + pr_err("gennvm: failed to allocate dma memory\n"); + return -ENOMEM; + } + + for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { + addr.g.pl = pl_idx; + rqd.ppa_list[pl_idx] = addr; + } + } + + gennvm_generic_to_addr_mode(dev, &rqd); + + ret = dev->ops->erase_block(dev->q, &rqd); + + if (plane_cnt) + nvm_dev_dma_free(dev, rqd.ppa_list, rqd.dma_ppa_list); + + return ret; +} + +static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid) +{ + struct gen_nvm *gn = dev->mp; + + return &gn->luns[lunid].vlun; +} + +static void gennvm_free_blocks_print(struct nvm_dev *dev) +{ + struct gen_nvm *gn = dev->mp; + struct gen_lun *lun; + unsigned int i; + + gennvm_for_each_lun(gn, lun, i) + pr_info("%s: lun%8u\t%u\n", + dev->name, i, lun->vlun.nr_free_blocks); +} + +static struct nvmm_type gennvm = { + .name = "gennvm", + .version = {0, 1, 0}, + + .register_mgr = gennvm_register, + .unregister_mgr = gennvm_unregister, + + .get_blk = gennvm_get_blk, + .put_blk = gennvm_put_blk, + + .submit_io = gennvm_submit_io, + .end_io = gennvm_end_io, + .erase_blk = gennvm_erase_blk, + + .get_lun = gennvm_get_lun, + .free_blocks_print = gennvm_free_blocks_print, +}; + +static int __init gennvm_module_init(void) +{ + return nvm_register_mgr(&gennvm); +} + +static void gennvm_module_exit(void) +{ + nvm_unregister_mgr(&gennvm); +} + +module_init(gennvm_module_init); +module_exit(gennvm_module_exit); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Generic media manager for Open-Channel SSDs"); diff --git a/drivers/lightnvm/gennvm.h b/drivers/lightnvm/gennvm.h new file mode 100644 index 000000000000..d23bd3501ddc --- /dev/null +++ b/drivers/lightnvm/gennvm.h @@ -0,0 +1,46 @@ +/* + * Copyright: Matias Bjorling <mb@bjorling.me> + * + * 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. + * + */ + +#ifndef GENNVM_H_ +#define GENNVM_H_ + +#include <linux/module.h> +#include <linux/vmalloc.h> + +#include <linux/lightnvm.h> + +struct gen_lun { + struct nvm_lun vlun; + + int reserved_blocks; + /* lun block lists */ + struct list_head used_list; /* In-use blocks */ + struct list_head free_list; /* Not used blocks i.e. released + * and ready for use + */ + struct list_head bb_list; /* Bad blocks. Mutually exclusive with + * free_list and used_list + */ +}; + +struct gen_nvm { + int nr_luns; + struct gen_lun *luns; +}; + +#define gennvm_for_each_lun(bm, lun, i) \ + for ((i) = 0, lun = &(bm)->luns[0]; \ + (i) < (bm)->nr_luns; (i)++, lun = &(bm)->luns[(i)]) + +#endif /* GENNVM_H_ */ diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c new file mode 100644 index 000000000000..64a888a5e9b3 --- /dev/null +++ b/drivers/lightnvm/rrpc.c @@ -0,0 +1,1323 @@ +/* + * Copyright (C) 2015 IT University of Copenhagen + * Initial release: Matias Bjorling <m@bjorling.me> + * + * 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. + * + * Implementation of a Round-robin page-based Hybrid FTL for Open-channel SSDs. + */ + +#include "rrpc.h" + +static struct kmem_cache *rrpc_gcb_cache, *rrpc_rq_cache; +static DECLARE_RWSEM(rrpc_lock); + +static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio, + struct nvm_rq *rqd, unsigned long flags); + +#define rrpc_for_each_lun(rrpc, rlun, i) \ + for ((i) = 0, rlun = &(rrpc)->luns[0]; \ + (i) < (rrpc)->nr_luns; (i)++, rlun = &(rrpc)->luns[(i)]) + +static void rrpc_page_invalidate(struct rrpc *rrpc, struct rrpc_addr *a) +{ + struct rrpc_block *rblk = a->rblk; + unsigned int pg_offset; + + lockdep_assert_held(&rrpc->rev_lock); + + if (a->addr == ADDR_EMPTY || !rblk) + return; + + spin_lock(&rblk->lock); + + div_u64_rem(a->addr, rrpc->dev->pgs_per_blk, &pg_offset); + WARN_ON(test_and_set_bit(pg_offset, rblk->invalid_pages)); + rblk->nr_invalid_pages++; + + spin_unlock(&rblk->lock); + + rrpc->rev_trans_map[a->addr - rrpc->poffset].addr = ADDR_EMPTY; +} + +static void rrpc_invalidate_range(struct rrpc *rrpc, sector_t slba, + unsigned len) +{ + sector_t i; + + spin_lock(&rrpc->rev_lock); + for (i = slba; i < slba + len; i++) { + struct rrpc_addr *gp = &rrpc->trans_map[i]; + + rrpc_page_invalidate(rrpc, gp); + gp->rblk = NULL; + } + spin_unlock(&rrpc->rev_lock); +} + +static struct nvm_rq *rrpc_inflight_laddr_acquire(struct rrpc *rrpc, + sector_t laddr, unsigned int pages) +{ + struct nvm_rq *rqd; + struct rrpc_inflight_rq *inf; + + rqd = mempool_alloc(rrpc->rq_pool, GFP_ATOMIC); + if (!rqd) + return ERR_PTR(-ENOMEM); + + inf = rrpc_get_inflight_rq(rqd); + if (rrpc_lock_laddr(rrpc, laddr, pages, inf)) { + mempool_free(rqd, rrpc->rq_pool); + return NULL; + } + + return rqd; +} + +static void rrpc_inflight_laddr_release(struct rrpc *rrpc, struct nvm_rq *rqd) +{ + struct rrpc_inflight_rq *inf = rrpc_get_inflight_rq(rqd); + + rrpc_unlock_laddr(rrpc, inf); + + mempool_free(rqd, rrpc->rq_pool); +} + +static void rrpc_discard(struct rrpc *rrpc, struct bio *bio) +{ + sector_t slba = bio->bi_iter.bi_sector / NR_PHY_IN_LOG; + sector_t len = bio->bi_iter.bi_size / RRPC_EXPOSED_PAGE_SIZE; + struct nvm_rq *rqd; + + do { + rqd = rrpc_inflight_laddr_acquire(rrpc, slba, len); + schedule(); + } while (!rqd); + + if (IS_ERR(rqd)) { + pr_err("rrpc: unable to acquire inflight IO\n"); + bio_io_error(bio); + return; + } + + rrpc_invalidate_range(rrpc, slba, len); + rrpc_inflight_laddr_release(rrpc, rqd); +} + +static int block_is_full(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + return (rblk->next_page == rrpc->dev->pgs_per_blk); +} + +static u64 block_to_addr(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + struct nvm_block *blk = rblk->parent; + + return blk->id * rrpc->dev->pgs_per_blk; +} + +static struct ppa_addr rrpc_ppa_to_gaddr(struct nvm_dev *dev, u64 addr) +{ + struct ppa_addr paddr; + + paddr.ppa = addr; + return __linear_to_generic_addr(dev, paddr); +} + +/* requires lun->lock taken */ +static void rrpc_set_lun_cur(struct rrpc_lun *rlun, struct rrpc_block *rblk) +{ + struct rrpc *rrpc = rlun->rrpc; + + BUG_ON(!rblk); + + if (rlun->cur) { + spin_lock(&rlun->cur->lock); + WARN_ON(!block_is_full(rrpc, rlun->cur)); + spin_unlock(&rlun->cur->lock); + } + rlun->cur = rblk; +} + +static struct rrpc_block *rrpc_get_blk(struct rrpc *rrpc, struct rrpc_lun *rlun, + unsigned long flags) +{ + struct nvm_block *blk; + struct rrpc_block *rblk; + + blk = nvm_get_blk(rrpc->dev, rlun->parent, 0); + if (!blk) + return NULL; + + rblk = &rlun->blocks[blk->id]; + blk->priv = rblk; + + bitmap_zero(rblk->invalid_pages, rrpc->dev->pgs_per_blk); + rblk->next_page = 0; + rblk->nr_invalid_pages = 0; + atomic_set(&rblk->data_cmnt_size, 0); + + return rblk; +} + +static void rrpc_put_blk(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + nvm_put_blk(rrpc->dev, rblk->parent); +} + +static struct rrpc_lun *get_next_lun(struct rrpc *rrpc) +{ + int next = atomic_inc_return(&rrpc->next_lun); + + return &rrpc->luns[next % rrpc->nr_luns]; +} + +static void rrpc_gc_kick(struct rrpc *rrpc) +{ + struct rrpc_lun *rlun; + unsigned int i; + + for (i = 0; i < rrpc->nr_luns; i++) { + rlun = &rrpc->luns[i]; + queue_work(rrpc->krqd_wq, &rlun->ws_gc); + } +} + +/* + * timed GC every interval. + */ +static void rrpc_gc_timer(unsigned long data) +{ + struct rrpc *rrpc = (struct rrpc *)data; + + rrpc_gc_kick(rrpc); + mod_timer(&rrpc->gc_timer, jiffies + msecs_to_jiffies(10)); +} + +static void rrpc_end_sync_bio(struct bio *bio) +{ + struct completion *waiting = bio->bi_private; + + if (bio->bi_error) + pr_err("nvm: gc request failed (%u).\n", bio->bi_error); + + complete(waiting); +} + +/* + * rrpc_move_valid_pages -- migrate live data off the block + * @rrpc: the 'rrpc' structure + * @block: the block from which to migrate live pages + * + * Description: + * GC algorithms may call this function to migrate remaining live + * pages off the block prior to erasing it. This function blocks + * further execution until the operation is complete. + */ +static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + struct request_queue *q = rrpc->dev->q; + struct rrpc_rev_addr *rev; + struct nvm_rq *rqd; + struct bio *bio; + struct page *page; + int slot; + int nr_pgs_per_blk = rrpc->dev->pgs_per_blk; + u64 phys_addr; + DECLARE_COMPLETION_ONSTACK(wait); + + if (bitmap_full(rblk->invalid_pages, nr_pgs_per_blk)) + return 0; + + bio = bio_alloc(GFP_NOIO, 1); + if (!bio) { + pr_err("nvm: could not alloc bio to gc\n"); + return -ENOMEM; + } + + page = mempool_alloc(rrpc->page_pool, GFP_NOIO); + + while ((slot = find_first_zero_bit(rblk->invalid_pages, + nr_pgs_per_blk)) < nr_pgs_per_blk) { + + /* Lock laddr */ + phys_addr = (rblk->parent->id * nr_pgs_per_blk) + slot; + +try: + spin_lock(&rrpc->rev_lock); + /* Get logical address from physical to logical table */ + rev = &rrpc->rev_trans_map[phys_addr - rrpc->poffset]; + /* already updated by previous regular write */ + if (rev->addr == ADDR_EMPTY) { + spin_unlock(&rrpc->rev_lock); + continue; + } + + rqd = rrpc_inflight_laddr_acquire(rrpc, rev->addr, 1); + if (IS_ERR_OR_NULL(rqd)) { + spin_unlock(&rrpc->rev_lock); + schedule(); + goto try; + } + + spin_unlock(&rrpc->rev_lock); + + /* Perform read to do GC */ + bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr); + bio->bi_rw = READ; + bio->bi_private = &wait; + bio->bi_end_io = rrpc_end_sync_bio; + + /* TODO: may fail when EXP_PG_SIZE > PAGE_SIZE */ + bio_add_pc_page(q, bio, page, RRPC_EXPOSED_PAGE_SIZE, 0); + + if (rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_GC)) { + pr_err("rrpc: gc read failed.\n"); + rrpc_inflight_laddr_release(rrpc, rqd); + goto finished; + } + wait_for_completion_io(&wait); + + bio_reset(bio); + reinit_completion(&wait); + + bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr); + bio->bi_rw = WRITE; + bio->bi_private = &wait; + bio->bi_end_io = rrpc_end_sync_bio; + + bio_add_pc_page(q, bio, page, RRPC_EXPOSED_PAGE_SIZE, 0); + + /* turn the command around and write the data back to a new + * address + */ + if (rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_GC)) { + pr_err("rrpc: gc write failed.\n"); + rrpc_inflight_laddr_release(rrpc, rqd); + goto finished; + } + wait_for_completion_io(&wait); + + rrpc_inflight_laddr_release(rrpc, rqd); + + bio_reset(bio); + } + +finished: + mempool_free(page, rrpc->page_pool); + bio_put(bio); + + if (!bitmap_full(rblk->invalid_pages, nr_pgs_per_blk)) { + pr_err("nvm: failed to garbage collect block\n"); + return -EIO; + } + + return 0; +} + +static void rrpc_block_gc(struct work_struct *work) +{ + struct rrpc_block_gc *gcb = container_of(work, struct rrpc_block_gc, + ws_gc); + struct rrpc *rrpc = gcb->rrpc; + struct rrpc_block *rblk = gcb->rblk; + struct nvm_dev *dev = rrpc->dev; + + pr_debug("nvm: block '%lu' being reclaimed\n", rblk->parent->id); + + if (rrpc_move_valid_pages(rrpc, rblk)) + goto done; + + nvm_erase_blk(dev, rblk->parent); + rrpc_put_blk(rrpc, rblk); +done: + mempool_free(gcb, rrpc->gcb_pool); +} + +/* the block with highest number of invalid pages, will be in the beginning + * of the list + */ +static struct rrpc_block *rblock_max_invalid(struct rrpc_block *ra, + struct rrpc_block *rb) +{ + if (ra->nr_invalid_pages == rb->nr_invalid_pages) + return ra; + + return (ra->nr_invalid_pages < rb->nr_invalid_pages) ? rb : ra; +} + +/* linearly find the block with highest number of invalid pages + * requires lun->lock + */ +static struct rrpc_block *block_prio_find_max(struct rrpc_lun *rlun) +{ + struct list_head *prio_list = &rlun->prio_list; + struct rrpc_block *rblock, *max; + + BUG_ON(list_empty(prio_list)); + + max = list_first_entry(prio_list, struct rrpc_block, prio); + list_for_each_entry(rblock, prio_list, prio) + max = rblock_max_invalid(max, rblock); + + return max; +} + +static void rrpc_lun_gc(struct work_struct *work) +{ + struct rrpc_lun *rlun = container_of(work, struct rrpc_lun, ws_gc); + struct rrpc *rrpc = rlun->rrpc; + struct nvm_lun *lun = rlun->parent; + struct rrpc_block_gc *gcb; + unsigned int nr_blocks_need; + + nr_blocks_need = rrpc->dev->blks_per_lun / GC_LIMIT_INVERSE; + + if (nr_blocks_need < rrpc->nr_luns) + nr_blocks_need = rrpc->nr_luns; + + spin_lock(&lun->lock); + while (nr_blocks_need > lun->nr_free_blocks && + !list_empty(&rlun->prio_list)) { + struct rrpc_block *rblock = block_prio_find_max(rlun); + struct nvm_block *block = rblock->parent; + + if (!rblock->nr_invalid_pages) + break; + + list_del_init(&rblock->prio); + + BUG_ON(!block_is_full(rrpc, rblock)); + + pr_debug("rrpc: selected block '%lu' for GC\n", block->id); + + gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC); + if (!gcb) + break; + + gcb->rrpc = rrpc; + gcb->rblk = rblock; + INIT_WORK(&gcb->ws_gc, rrpc_block_gc); + + queue_work(rrpc->kgc_wq, &gcb->ws_gc); + + nr_blocks_need--; + } + spin_unlock(&lun->lock); + + /* TODO: Hint that request queue can be started again */ +} + +static void rrpc_gc_queue(struct work_struct *work) +{ + struct rrpc_block_gc *gcb = container_of(work, struct rrpc_block_gc, + ws_gc); + struct rrpc *rrpc = gcb->rrpc; + struct rrpc_block *rblk = gcb->rblk; + struct nvm_lun *lun = rblk->parent->lun; + struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset]; + + spin_lock(&rlun->lock); + list_add_tail(&rblk->prio, &rlun->prio_list); + spin_unlock(&rlun->lock); + + mempool_free(gcb, rrpc->gcb_pool); + pr_debug("nvm: block '%lu' is full, allow GC (sched)\n", + rblk->parent->id); +} + +static const struct block_device_operations rrpc_fops = { + .owner = THIS_MODULE, +}; + +static struct rrpc_lun *rrpc_get_lun_rr(struct rrpc *rrpc, int is_gc) +{ + unsigned int i; + struct rrpc_lun *rlun, *max_free; + + if (!is_gc) + return get_next_lun(rrpc); + + /* during GC, we don't care about RR, instead we want to make + * sure that we maintain evenness between the block luns. + */ + max_free = &rrpc->luns[0]; + /* prevent GC-ing lun from devouring pages of a lun with + * little free blocks. We don't take the lock as we only need an + * estimate. + */ + rrpc_for_each_lun(rrpc, rlun, i) { + if (rlun->parent->nr_free_blocks > + max_free->parent->nr_free_blocks) + max_free = rlun; + } + + return max_free; +} + +static struct rrpc_addr *rrpc_update_map(struct rrpc *rrpc, sector_t laddr, + struct rrpc_block *rblk, u64 paddr) +{ + struct rrpc_addr *gp; + struct rrpc_rev_addr *rev; + + BUG_ON(laddr >= rrpc->nr_pages); + + gp = &rrpc->trans_map[laddr]; + spin_lock(&rrpc->rev_lock); + if (gp->rblk) + rrpc_page_invalidate(rrpc, gp); + + gp->addr = paddr; + gp->rblk = rblk; + + rev = &rrpc->rev_trans_map[gp->addr - rrpc->poffset]; + rev->addr = laddr; + spin_unlock(&rrpc->rev_lock); + + return gp; +} + +static u64 rrpc_alloc_addr(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + u64 addr = ADDR_EMPTY; + + spin_lock(&rblk->lock); + if (block_is_full(rrpc, rblk)) + goto out; + + addr = block_to_addr(rrpc, rblk) + rblk->next_page; + + rblk->next_page++; +out: + spin_unlock(&rblk->lock); + return addr; +} + +/* Simple round-robin Logical to physical address translation. + * + * Retrieve the mapping using the active append point. Then update the ap for + * the next write to the disk. + * + * Returns rrpc_addr with the physical address and block. Remember to return to + * rrpc->addr_cache when request is finished. + */ +static struct rrpc_addr *rrpc_map_page(struct rrpc *rrpc, sector_t laddr, + int is_gc) +{ + struct rrpc_lun *rlun; + struct rrpc_block *rblk; + struct nvm_lun *lun; + u64 paddr; + + rlun = rrpc_get_lun_rr(rrpc, is_gc); + lun = rlun->parent; + + if (!is_gc && lun->nr_free_blocks < rrpc->nr_luns * 4) + return NULL; + + spin_lock(&rlun->lock); + + rblk = rlun->cur; +retry: + paddr = rrpc_alloc_addr(rrpc, rblk); + + if (paddr == ADDR_EMPTY) { + rblk = rrpc_get_blk(rrpc, rlun, 0); + if (rblk) { + rrpc_set_lun_cur(rlun, rblk); + goto retry; + } + + if (is_gc) { + /* retry from emergency gc block */ + paddr = rrpc_alloc_addr(rrpc, rlun->gc_cur); + if (paddr == ADDR_EMPTY) { + rblk = rrpc_get_blk(rrpc, rlun, 1); + if (!rblk) { + pr_err("rrpc: no more blocks"); + goto err; + } + + rlun->gc_cur = rblk; + paddr = rrpc_alloc_addr(rrpc, rlun->gc_cur); + } + rblk = rlun->gc_cur; + } + } + + spin_unlock(&rlun->lock); + return rrpc_update_map(rrpc, laddr, rblk, paddr); +err: + spin_unlock(&rlun->lock); + return NULL; +} + +static void rrpc_run_gc(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + struct rrpc_block_gc *gcb; + + gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC); + if (!gcb) { + pr_err("rrpc: unable to queue block for gc."); + return; + } + + gcb->rrpc = rrpc; + gcb->rblk = rblk; + + INIT_WORK(&gcb->ws_gc, rrpc_gc_queue); + queue_work(rrpc->kgc_wq, &gcb->ws_gc); +} + +static void rrpc_end_io_write(struct rrpc *rrpc, struct rrpc_rq *rrqd, + sector_t laddr, uint8_t npages) +{ + struct rrpc_addr *p; + struct rrpc_block *rblk; + struct nvm_lun *lun; + int cmnt_size, i; + + for (i = 0; i < npages; i++) { + p = &rrpc->trans_map[laddr + i]; + rblk = p->rblk; + lun = rblk->parent->lun; + + cmnt_size = atomic_inc_return(&rblk->data_cmnt_size); + if (unlikely(cmnt_size == rrpc->dev->pgs_per_blk)) + rrpc_run_gc(rrpc, rblk); + } +} + +static int rrpc_end_io(struct nvm_rq *rqd, int error) +{ + struct rrpc *rrpc = container_of(rqd->ins, struct rrpc, instance); + struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd); + uint8_t npages = rqd->nr_pages; + sector_t laddr = rrpc_get_laddr(rqd->bio) - npages; + + if (bio_data_dir(rqd->bio) == WRITE) + rrpc_end_io_write(rrpc, rrqd, laddr, npages); + + if (rrqd->flags & NVM_IOTYPE_GC) + return 0; + + rrpc_unlock_rq(rrpc, rqd); + bio_put(rqd->bio); + + if (npages > 1) + nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, rqd->dma_ppa_list); + if (rqd->metadata) + nvm_dev_dma_free(rrpc->dev, rqd->metadata, rqd->dma_metadata); + + mempool_free(rqd, rrpc->rq_pool); + + return 0; +} + +static int rrpc_read_ppalist_rq(struct rrpc *rrpc, struct bio *bio, + struct nvm_rq *rqd, unsigned long flags, int npages) +{ + struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd); + struct rrpc_addr *gp; + sector_t laddr = rrpc_get_laddr(bio); + int is_gc = flags & NVM_IOTYPE_GC; + int i; + + if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) { + nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, rqd->dma_ppa_list); + return NVM_IO_REQUEUE; + } + + for (i = 0; i < npages; i++) { + /* We assume that mapping occurs at 4KB granularity */ + BUG_ON(!(laddr + i >= 0 && laddr + i < rrpc->nr_pages)); + gp = &rrpc->trans_map[laddr + i]; + + if (gp->rblk) { + rqd->ppa_list[i] = rrpc_ppa_to_gaddr(rrpc->dev, + gp->addr); + } else { + BUG_ON(is_gc); + rrpc_unlock_laddr(rrpc, r); + nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, + rqd->dma_ppa_list); + return NVM_IO_DONE; + } + } + + rqd->opcode = NVM_OP_HBREAD; + + return NVM_IO_OK; +} + +static int rrpc_read_rq(struct rrpc *rrpc, struct bio *bio, struct nvm_rq *rqd, + unsigned long flags) +{ + struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd); + int is_gc = flags & NVM_IOTYPE_GC; + sector_t laddr = rrpc_get_laddr(bio); + struct rrpc_addr *gp; + + if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) + return NVM_IO_REQUEUE; + + BUG_ON(!(laddr >= 0 && laddr < rrpc->nr_pages)); + gp = &rrpc->trans_map[laddr]; + + if (gp->rblk) { + rqd->ppa_addr = rrpc_ppa_to_gaddr(rrpc->dev, gp->addr); + } else { + BUG_ON(is_gc); + rrpc_unlock_rq(rrpc, rqd); + return NVM_IO_DONE; + } + + rqd->opcode = NVM_OP_HBREAD; + rrqd->addr = gp; + + return NVM_IO_OK; +} + +static int rrpc_write_ppalist_rq(struct rrpc *rrpc, struct bio *bio, + struct nvm_rq *rqd, unsigned long flags, int npages) +{ + struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd); + struct rrpc_addr *p; + sector_t laddr = rrpc_get_laddr(bio); + int is_gc = flags & NVM_IOTYPE_GC; + int i; + + if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) { + nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, rqd->dma_ppa_list); + return NVM_IO_REQUEUE; + } + + for (i = 0; i < npages; i++) { + /* We assume that mapping occurs at 4KB granularity */ + p = rrpc_map_page(rrpc, laddr + i, is_gc); + if (!p) { + BUG_ON(is_gc); + rrpc_unlock_laddr(rrpc, r); + nvm_dev_dma_free(rrpc->dev, rqd->ppa_list, + rqd->dma_ppa_list); + rrpc_gc_kick(rrpc); + return NVM_IO_REQUEUE; + } + + rqd->ppa_list[i] = rrpc_ppa_to_gaddr(rrpc->dev, + p->addr); + } + + rqd->opcode = NVM_OP_HBWRITE; + + return NVM_IO_OK; +} + +static int rrpc_write_rq(struct rrpc *rrpc, struct bio *bio, + struct nvm_rq *rqd, unsigned long flags) +{ + struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd); + struct rrpc_addr *p; + int is_gc = flags & NVM_IOTYPE_GC; + sector_t laddr = rrpc_get_laddr(bio); + + if (!is_gc && rrpc_lock_rq(rrpc, bio, rqd)) + return NVM_IO_REQUEUE; + + p = rrpc_map_page(rrpc, laddr, is_gc); + if (!p) { + BUG_ON(is_gc); + rrpc_unlock_rq(rrpc, rqd); + rrpc_gc_kick(rrpc); + return NVM_IO_REQUEUE; + } + + rqd->ppa_addr = rrpc_ppa_to_gaddr(rrpc->dev, p->addr); + rqd->opcode = NVM_OP_HBWRITE; + rrqd->addr = p; + + return NVM_IO_OK; +} + +static int rrpc_setup_rq(struct rrpc *rrpc, struct bio *bio, + struct nvm_rq *rqd, unsigned long flags, uint8_t npages) +{ + if (npages > 1) { + rqd->ppa_list = nvm_dev_dma_alloc(rrpc->dev, GFP_KERNEL, + &rqd->dma_ppa_list); + if (!rqd->ppa_list) { + pr_err("rrpc: not able to allocate ppa list\n"); + return NVM_IO_ERR; + } + + if (bio_rw(bio) == WRITE) + return rrpc_write_ppalist_rq(rrpc, bio, rqd, flags, + npages); + + return rrpc_read_ppalist_rq(rrpc, bio, rqd, flags, npages); + } + + if (bio_rw(bio) == WRITE) + return rrpc_write_rq(rrpc, bio, rqd, flags); + + return rrpc_read_rq(rrpc, bio, rqd, flags); +} + +static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio, + struct nvm_rq *rqd, unsigned long flags) +{ + int err; + struct rrpc_rq *rrq = nvm_rq_to_pdu(rqd); + uint8_t nr_pages = rrpc_get_pages(bio); + int bio_size = bio_sectors(bio) << 9; + + if (bio_size < rrpc->dev->sec_size) + return NVM_IO_ERR; + else if (bio_size > rrpc->dev->max_rq_size) + return NVM_IO_ERR; + + err = rrpc_setup_rq(rrpc, bio, rqd, flags, nr_pages); + if (err) + return err; + + bio_get(bio); + rqd->bio = bio; + rqd->ins = &rrpc->instance; + rqd->nr_pages = nr_pages; + rrq->flags = flags; + + err = nvm_submit_io(rrpc->dev, rqd); + if (err) { + pr_err("rrpc: I/O submission failed: %d\n", err); + return NVM_IO_ERR; + } + + return NVM_IO_OK; +} + +static void rrpc_make_rq(struct request_queue *q, struct bio *bio) +{ + struct rrpc *rrpc = q->queuedata; + struct nvm_rq *rqd; + int err; + + if (bio->bi_rw & REQ_DISCARD) { + rrpc_discard(rrpc, bio); + return; + } + + rqd = mempool_alloc(rrpc->rq_pool, GFP_KERNEL); + if (!rqd) { + pr_err_ratelimited("rrpc: not able to queue bio."); + bio_io_error(bio); + return; + } + memset(rqd, 0, sizeof(struct nvm_rq)); + + err = rrpc_submit_io(rrpc, bio, rqd, NVM_IOTYPE_NONE); + switch (err) { + case NVM_IO_OK: + return; + case NVM_IO_ERR: + bio_io_error(bio); + break; + case NVM_IO_DONE: + bio_endio(bio); + break; + case NVM_IO_REQUEUE: + spin_lock(&rrpc->bio_lock); + bio_list_add(&rrpc->requeue_bios, bio); + spin_unlock(&rrpc->bio_lock); + queue_work(rrpc->kgc_wq, &rrpc->ws_requeue); + break; + } + + mempool_free(rqd, rrpc->rq_pool); +} + +static void rrpc_requeue(struct work_struct *work) +{ + struct rrpc *rrpc = container_of(work, struct rrpc, ws_requeue); + struct bio_list bios; + struct bio *bio; + + bio_list_init(&bios); + + spin_lock(&rrpc->bio_lock); + bio_list_merge(&bios, &rrpc->requeue_bios); + bio_list_init(&rrpc->requeue_bios); + spin_unlock(&rrpc->bio_lock); + + while ((bio = bio_list_pop(&bios))) + rrpc_make_rq(rrpc->disk->queue, bio); +} + +static void rrpc_gc_free(struct rrpc *rrpc) +{ + struct rrpc_lun *rlun; + int i; + + if (rrpc->krqd_wq) + destroy_workqueue(rrpc->krqd_wq); + + if (rrpc->kgc_wq) + destroy_workqueue(rrpc->kgc_wq); + + if (!rrpc->luns) + return; + + for (i = 0; i < rrpc->nr_luns; i++) { + rlun = &rrpc->luns[i]; + + if (!rlun->blocks) + break; + vfree(rlun->blocks); + } +} + +static int rrpc_gc_init(struct rrpc *rrpc) +{ + rrpc->krqd_wq = alloc_workqueue("rrpc-lun", WQ_MEM_RECLAIM|WQ_UNBOUND, + rrpc->nr_luns); + if (!rrpc->krqd_wq) + return -ENOMEM; + + rrpc->kgc_wq = alloc_workqueue("rrpc-bg", WQ_MEM_RECLAIM, 1); + if (!rrpc->kgc_wq) + return -ENOMEM; + + setup_timer(&rrpc->gc_timer, rrpc_gc_timer, (unsigned long)rrpc); + + return 0; +} + +static void rrpc_map_free(struct rrpc *rrpc) +{ + vfree(rrpc->rev_trans_map); + vfree(rrpc->trans_map); +} + +static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private) +{ + struct rrpc *rrpc = (struct rrpc *)private; + struct nvm_dev *dev = rrpc->dev; + struct rrpc_addr *addr = rrpc->trans_map + slba; + struct rrpc_rev_addr *raddr = rrpc->rev_trans_map; + sector_t max_pages = dev->total_pages * (dev->sec_size >> 9); + u64 elba = slba + nlb; + u64 i; + + if (unlikely(elba > dev->total_pages)) { + pr_err("nvm: L2P data from device is out of bounds!\n"); + return -EINVAL; + } + + for (i = 0; i < nlb; i++) { + u64 pba = le64_to_cpu(entries[i]); + /* LNVM treats address-spaces as silos, LBA and PBA are + * equally large and zero-indexed. + */ + if (unlikely(pba >= max_pages && pba != U64_MAX)) { + pr_err("nvm: L2P data entry is out of bounds!\n"); + return -EINVAL; + } + + /* Address zero is a special one. The first page on a disk is + * protected. As it often holds internal device boot + * information. + */ + if (!pba) + continue; + + addr[i].addr = pba; + raddr[pba].addr = slba + i; + } + + return 0; +} + +static int rrpc_map_init(struct rrpc *rrpc) +{ + struct nvm_dev *dev = rrpc->dev; + sector_t i; + int ret; + + rrpc->trans_map = vzalloc(sizeof(struct rrpc_addr) * rrpc->nr_pages); + if (!rrpc->trans_map) + return -ENOMEM; + + rrpc->rev_trans_map = vmalloc(sizeof(struct rrpc_rev_addr) + * rrpc->nr_pages); + if (!rrpc->rev_trans_map) + return -ENOMEM; + + for (i = 0; i < rrpc->nr_pages; i++) { + struct rrpc_addr *p = &rrpc->trans_map[i]; + struct rrpc_rev_addr *r = &rrpc->rev_trans_map[i]; + + p->addr = ADDR_EMPTY; + r->addr = ADDR_EMPTY; + } + + if (!dev->ops->get_l2p_tbl) + return 0; + + /* Bring up the mapping table from device */ + ret = dev->ops->get_l2p_tbl(dev->q, 0, dev->total_pages, + rrpc_l2p_update, rrpc); + if (ret) { + pr_err("nvm: rrpc: could not read L2P table.\n"); + return -EINVAL; + } + + return 0; +} + + +/* Minimum pages needed within a lun */ +#define PAGE_POOL_SIZE 16 +#define ADDR_POOL_SIZE 64 + +static int rrpc_core_init(struct rrpc *rrpc) +{ + down_write(&rrpc_lock); + if (!rrpc_gcb_cache) { + rrpc_gcb_cache = kmem_cache_create("rrpc_gcb", + sizeof(struct rrpc_block_gc), 0, 0, NULL); + if (!rrpc_gcb_cache) { + up_write(&rrpc_lock); + return -ENOMEM; + } + + rrpc_rq_cache = kmem_cache_create("rrpc_rq", + sizeof(struct nvm_rq) + sizeof(struct rrpc_rq), + 0, 0, NULL); + if (!rrpc_rq_cache) { + kmem_cache_destroy(rrpc_gcb_cache); + up_write(&rrpc_lock); + return -ENOMEM; + } + } + up_write(&rrpc_lock); + + rrpc->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0); + if (!rrpc->page_pool) + return -ENOMEM; + + rrpc->gcb_pool = mempool_create_slab_pool(rrpc->dev->nr_luns, + rrpc_gcb_cache); + if (!rrpc->gcb_pool) + return -ENOMEM; + + rrpc->rq_pool = mempool_create_slab_pool(64, rrpc_rq_cache); + if (!rrpc->rq_pool) + return -ENOMEM; + + spin_lock_init(&rrpc->inflights.lock); + INIT_LIST_HEAD(&rrpc->inflights.reqs); + + return 0; +} + +static void rrpc_core_free(struct rrpc *rrpc) +{ + mempool_destroy(rrpc->page_pool); + mempool_destroy(rrpc->gcb_pool); + mempool_destroy(rrpc->rq_pool); +} + +static void rrpc_luns_free(struct rrpc *rrpc) +{ + kfree(rrpc->luns); +} + +static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end) +{ + struct nvm_dev *dev = rrpc->dev; + struct rrpc_lun *rlun; + int i, j; + + spin_lock_init(&rrpc->rev_lock); + + rrpc->luns = kcalloc(rrpc->nr_luns, sizeof(struct rrpc_lun), + GFP_KERNEL); + if (!rrpc->luns) + return -ENOMEM; + + /* 1:1 mapping */ + for (i = 0; i < rrpc->nr_luns; i++) { + struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i); + + if (dev->pgs_per_blk > + MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) { + pr_err("rrpc: number of pages per block too high."); + goto err; + } + + rlun = &rrpc->luns[i]; + rlun->rrpc = rrpc; + rlun->parent = lun; + INIT_LIST_HEAD(&rlun->prio_list); + INIT_WORK(&rlun->ws_gc, rrpc_lun_gc); + spin_lock_init(&rlun->lock); + + rrpc->total_blocks += dev->blks_per_lun; + rrpc->nr_pages += dev->sec_per_lun; + + rlun->blocks = vzalloc(sizeof(struct rrpc_block) * + rrpc->dev->blks_per_lun); + if (!rlun->blocks) + goto err; + + for (j = 0; j < rrpc->dev->blks_per_lun; j++) { + struct rrpc_block *rblk = &rlun->blocks[j]; + struct nvm_block *blk = &lun->blocks[j]; + + rblk->parent = blk; + INIT_LIST_HEAD(&rblk->prio); + spin_lock_init(&rblk->lock); + } + } + + return 0; +err: + return -ENOMEM; +} + +static void rrpc_free(struct rrpc *rrpc) +{ + rrpc_gc_free(rrpc); + rrpc_map_free(rrpc); + rrpc_core_free(rrpc); + rrpc_luns_free(rrpc); + + kfree(rrpc); +} + +static void rrpc_exit(void *private) +{ + struct rrpc *rrpc = private; + + del_timer(&rrpc->gc_timer); + + flush_workqueue(rrpc->krqd_wq); + flush_workqueue(rrpc->kgc_wq); + + rrpc_free(rrpc); +} + +static sector_t rrpc_capacity(void *private) +{ + struct rrpc *rrpc = private; + struct nvm_dev *dev = rrpc->dev; + sector_t reserved, provisioned; + + /* cur, gc, and two emergency blocks for each lun */ + reserved = rrpc->nr_luns * dev->max_pages_per_blk * 4; + provisioned = rrpc->nr_pages - reserved; + + if (reserved > rrpc->nr_pages) { + pr_err("rrpc: not enough space available to expose storage.\n"); + return 0; + } + + sector_div(provisioned, 10); + return provisioned * 9 * NR_PHY_IN_LOG; +} + +/* + * Looks up the logical address from reverse trans map and check if its valid by + * comparing the logical to physical address with the physical address. + * Returns 0 on free, otherwise 1 if in use + */ +static void rrpc_block_map_update(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + struct nvm_dev *dev = rrpc->dev; + int offset; + struct rrpc_addr *laddr; + u64 paddr, pladdr; + + for (offset = 0; offset < dev->pgs_per_blk; offset++) { + paddr = block_to_addr(rrpc, rblk) + offset; + + pladdr = rrpc->rev_trans_map[paddr].addr; + if (pladdr == ADDR_EMPTY) + continue; + + laddr = &rrpc->trans_map[pladdr]; + + if (paddr == laddr->addr) { + laddr->rblk = rblk; + } else { + set_bit(offset, rblk->invalid_pages); + rblk->nr_invalid_pages++; + } + } +} + +static int rrpc_blocks_init(struct rrpc *rrpc) +{ + struct rrpc_lun *rlun; + struct rrpc_block *rblk; + int lun_iter, blk_iter; + + for (lun_iter = 0; lun_iter < rrpc->nr_luns; lun_iter++) { + rlun = &rrpc->luns[lun_iter]; + + for (blk_iter = 0; blk_iter < rrpc->dev->blks_per_lun; + blk_iter++) { + rblk = &rlun->blocks[blk_iter]; + rrpc_block_map_update(rrpc, rblk); + } + } + + return 0; +} + +static int rrpc_luns_configure(struct rrpc *rrpc) +{ + struct rrpc_lun *rlun; + struct rrpc_block *rblk; + int i; + + for (i = 0; i < rrpc->nr_luns; i++) { + rlun = &rrpc->luns[i]; + + rblk = rrpc_get_blk(rrpc, rlun, 0); + if (!rblk) + return -EINVAL; + + rrpc_set_lun_cur(rlun, rblk); + + /* Emergency gc block */ + rblk = rrpc_get_blk(rrpc, rlun, 1); + if (!rblk) + return -EINVAL; + rlun->gc_cur = rblk; + } + + return 0; +} + +static struct nvm_tgt_type tt_rrpc; + +static void *rrpc_init(struct nvm_dev *dev, struct gendisk *tdisk, + int lun_begin, int lun_end) +{ + struct request_queue *bqueue = dev->q; + struct request_queue *tqueue = tdisk->queue; + struct rrpc *rrpc; + int ret; + + if (!(dev->identity.dom & NVM_RSP_L2P)) { + pr_err("nvm: rrpc: device does not support l2p (%x)\n", + dev->identity.dom); + return ERR_PTR(-EINVAL); + } + + rrpc = kzalloc(sizeof(struct rrpc), GFP_KERNEL); + if (!rrpc) + return ERR_PTR(-ENOMEM); + + rrpc->instance.tt = &tt_rrpc; + rrpc->dev = dev; + rrpc->disk = tdisk; + + bio_list_init(&rrpc->requeue_bios); + spin_lock_init(&rrpc->bio_lock); + INIT_WORK(&rrpc->ws_requeue, rrpc_requeue); + + rrpc->nr_luns = lun_end - lun_begin + 1; + + /* simple round-robin strategy */ + atomic_set(&rrpc->next_lun, -1); + + ret = rrpc_luns_init(rrpc, lun_begin, lun_end); + if (ret) { + pr_err("nvm: rrpc: could not initialize luns\n"); + goto err; + } + + rrpc->poffset = dev->sec_per_lun * lun_begin; + rrpc->lun_offset = lun_begin; + + ret = rrpc_core_init(rrpc); + if (ret) { + pr_err("nvm: rrpc: could not initialize core\n"); + goto err; + } + + ret = rrpc_map_init(rrpc); + if (ret) { + pr_err("nvm: rrpc: could not initialize maps\n"); + goto err; + } + + ret = rrpc_blocks_init(rrpc); + if (ret) { + pr_err("nvm: rrpc: could not initialize state for blocks\n"); + goto err; + } + + ret = rrpc_luns_configure(rrpc); + if (ret) { + pr_err("nvm: rrpc: not enough blocks available in LUNs.\n"); + goto err; + } + + ret = rrpc_gc_init(rrpc); + if (ret) { + pr_err("nvm: rrpc: could not initialize gc\n"); + goto err; + } + + /* inherit the size from the underlying device */ + blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue)); + blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue)); + + pr_info("nvm: rrpc initialized with %u luns and %llu pages.\n", + rrpc->nr_luns, (unsigned long long)rrpc->nr_pages); + + mod_timer(&rrpc->gc_timer, jiffies + msecs_to_jiffies(10)); + + return rrpc; +err: + rrpc_free(rrpc); + return ERR_PTR(ret); +} + +/* round robin, page-based FTL, and cost-based GC */ +static struct nvm_tgt_type tt_rrpc = { + .name = "rrpc", + .version = {1, 0, 0}, + + .make_rq = rrpc_make_rq, + .capacity = rrpc_capacity, + .end_io = rrpc_end_io, + + .init = rrpc_init, + .exit = rrpc_exit, +}; + +static int __init rrpc_module_init(void) +{ + return nvm_register_target(&tt_rrpc); +} + +static void rrpc_module_exit(void) +{ + nvm_unregister_target(&tt_rrpc); +} + +module_init(rrpc_module_init); +module_exit(rrpc_module_exit); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Block-Device Target for Open-Channel SSDs"); diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h new file mode 100644 index 000000000000..a9696a06c38c --- /dev/null +++ b/drivers/lightnvm/rrpc.h @@ -0,0 +1,239 @@ +/* + * Copyright (C) 2015 IT University of Copenhagen + * Initial release: Matias Bjorling <m@bjorling.me> + * + * 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. + * + * Implementation of a Round-robin page-based Hybrid FTL for Open-channel SSDs. + */ + +#ifndef RRPC_H_ +#define RRPC_H_ + +#include <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/bio.h> +#include <linux/module.h> +#include <linux/kthread.h> +#include <linux/vmalloc.h> + +#include <linux/lightnvm.h> + +/* Run only GC if less than 1/X blocks are free */ +#define GC_LIMIT_INVERSE 10 +#define GC_TIME_SECS 100 + +#define RRPC_SECTOR (512) +#define RRPC_EXPOSED_PAGE_SIZE (4096) + +#define NR_PHY_IN_LOG (RRPC_EXPOSED_PAGE_SIZE / RRPC_SECTOR) + +struct rrpc_inflight { + struct list_head reqs; + spinlock_t lock; +}; + +struct rrpc_inflight_rq { + struct list_head list; + sector_t l_start; + sector_t l_end; +}; + +struct rrpc_rq { + struct rrpc_inflight_rq inflight_rq; + struct rrpc_addr *addr; + unsigned long flags; +}; + +struct rrpc_block { + struct nvm_block *parent; + struct list_head prio; + +#define MAX_INVALID_PAGES_STORAGE 8 + /* Bitmap for invalid page intries */ + unsigned long invalid_pages[MAX_INVALID_PAGES_STORAGE]; + /* points to the next writable page within a block */ + unsigned int next_page; + /* number of pages that are invalid, wrt host page size */ + unsigned int nr_invalid_pages; + + spinlock_t lock; + atomic_t data_cmnt_size; /* data pages committed to stable storage */ +}; + +struct rrpc_lun { + struct rrpc *rrpc; + struct nvm_lun *parent; + struct rrpc_block *cur, *gc_cur; + struct rrpc_block *blocks; /* Reference to block allocation */ + struct list_head prio_list; /* Blocks that may be GC'ed */ + struct work_struct ws_gc; + + spinlock_t lock; +}; + +struct rrpc { + /* instance must be kept in top to resolve rrpc in unprep */ + struct nvm_tgt_instance instance; + + struct nvm_dev *dev; + struct gendisk *disk; + + u64 poffset; /* physical page offset */ + int lun_offset; + + int nr_luns; + struct rrpc_lun *luns; + + /* calculated values */ + unsigned long long nr_pages; + unsigned long total_blocks; + + /* Write strategy variables. Move these into each for structure for each + * strategy + */ + atomic_t next_lun; /* Whenever a page is written, this is updated + * to point to the next write lun + */ + + spinlock_t bio_lock; + struct bio_list requeue_bios; + struct work_struct ws_requeue; + + /* Simple translation map of logical addresses to physical addresses. + * The logical addresses is known by the host system, while the physical + * addresses are used when writing to the disk block device. + */ + struct rrpc_addr *trans_map; + /* also store a reverse map for garbage collection */ + struct rrpc_rev_addr *rev_trans_map; + spinlock_t rev_lock; + + struct rrpc_inflight inflights; + + mempool_t *addr_pool; + mempool_t *page_pool; + mempool_t *gcb_pool; + mempool_t *rq_pool; + + struct timer_list gc_timer; + struct workqueue_struct *krqd_wq; + struct workqueue_struct *kgc_wq; +}; + +struct rrpc_block_gc { + struct rrpc *rrpc; + struct rrpc_block *rblk; + struct work_struct ws_gc; +}; + +/* Logical to physical mapping */ +struct rrpc_addr { + u64 addr; + struct rrpc_block *rblk; +}; + +/* Physical to logical mapping */ +struct rrpc_rev_addr { + u64 addr; +}; + +static inline sector_t rrpc_get_laddr(struct bio *bio) +{ + return bio->bi_iter.bi_sector / NR_PHY_IN_LOG; +} + +static inline unsigned int rrpc_get_pages(struct bio *bio) +{ + return bio->bi_iter.bi_size / RRPC_EXPOSED_PAGE_SIZE; +} + +static inline sector_t rrpc_get_sector(sector_t laddr) +{ + return laddr * NR_PHY_IN_LOG; +} + +static inline int request_intersects(struct rrpc_inflight_rq *r, + sector_t laddr_start, sector_t laddr_end) +{ + return (laddr_end >= r->l_start && laddr_end <= r->l_end) && + (laddr_start >= r->l_start && laddr_start <= r->l_end); +} + +static int __rrpc_lock_laddr(struct rrpc *rrpc, sector_t laddr, + unsigned pages, struct rrpc_inflight_rq *r) +{ + sector_t laddr_end = laddr + pages - 1; + struct rrpc_inflight_rq *rtmp; + + spin_lock_irq(&rrpc->inflights.lock); + list_for_each_entry(rtmp, &rrpc->inflights.reqs, list) { + if (unlikely(request_intersects(rtmp, laddr, laddr_end))) { + /* existing, overlapping request, come back later */ + spin_unlock_irq(&rrpc->inflights.lock); + return 1; + } + } + + r->l_start = laddr; + r->l_end = laddr_end; + + list_add_tail(&r->list, &rrpc->inflights.reqs); + spin_unlock_irq(&rrpc->inflights.lock); + return 0; +} + +static inline int rrpc_lock_laddr(struct rrpc *rrpc, sector_t laddr, + unsigned pages, + struct rrpc_inflight_rq *r) +{ + BUG_ON((laddr + pages) > rrpc->nr_pages); + + return __rrpc_lock_laddr(rrpc, laddr, pages, r); +} + +static inline struct rrpc_inflight_rq *rrpc_get_inflight_rq(struct nvm_rq *rqd) +{ + struct rrpc_rq *rrqd = nvm_rq_to_pdu(rqd); + + return &rrqd->inflight_rq; +} + +static inline int rrpc_lock_rq(struct rrpc *rrpc, struct bio *bio, + struct nvm_rq *rqd) +{ + sector_t laddr = rrpc_get_laddr(bio); + unsigned int pages = rrpc_get_pages(bio); + struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd); + + return rrpc_lock_laddr(rrpc, laddr, pages, r); +} + +static inline void rrpc_unlock_laddr(struct rrpc *rrpc, + struct rrpc_inflight_rq *r) +{ + unsigned long flags; + + spin_lock_irqsave(&rrpc->inflights.lock, flags); + list_del_init(&r->list); + spin_unlock_irqrestore(&rrpc->inflights.lock, flags); +} + +static inline void rrpc_unlock_rq(struct rrpc *rrpc, struct nvm_rq *rqd) +{ + struct rrpc_inflight_rq *r = rrpc_get_inflight_rq(rqd); + uint8_t pages = rqd->nr_pages; + + BUG_ON((r->l_start + pages) > rrpc->nr_pages); + + rrpc_unlock_laddr(rrpc, r); +} + +#endif /* RRPC_H_ */ |