From cd9e9808d18fe7107c306f6e71c8be7230ee42b4 Mon Sep 17 00:00:00 2001 From: Matias Bjørling Date: Wed, 28 Oct 2015 19:54:55 +0100 Subject: lightnvm: Support for Open-Channel SSDs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Open-channel SSDs are devices that share responsibilities with the host in order to implement and maintain features that typical SSDs keep strictly in firmware. These include (i) the Flash Translation Layer (FTL), (ii) bad block management, and (iii) hardware units such as the flash controller, the interface controller, and large amounts of flash chips. In this way, Open-channels SSDs exposes direct access to their physical flash storage, while keeping a subset of the internal features of SSDs. LightNVM is a specification that gives support to Open-channel SSDs LightNVM allows the host to manage data placement, garbage collection, and parallelism. Device specific responsibilities such as bad block management, FTL extensions to support atomic IOs, or metadata persistence are still handled by the device. The implementation of LightNVM consists of two parts: core and (multiple) targets. The core implements functionality shared across targets. This is initialization, teardown and statistics. The targets implement the interface that exposes physical flash to user-space applications. Examples of such targets include key-value store, object-store, as well as traditional block devices, which can be application-specific. Contributions in this patch from: Javier Gonzalez Dongsheng Yang Jesper Madsen Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- Documentation/ioctl/ioctl-number.txt | 1 + MAINTAINERS | 8 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/lightnvm/Kconfig | 28 ++ drivers/lightnvm/Makefile | 5 + drivers/lightnvm/core.c | 826 +++++++++++++++++++++++++++++++++++ include/linux/lightnvm.h | 522 ++++++++++++++++++++++ include/uapi/linux/lightnvm.h | 130 ++++++ 9 files changed, 1523 insertions(+) create mode 100644 drivers/lightnvm/Kconfig create mode 100644 drivers/lightnvm/Makefile create mode 100644 drivers/lightnvm/core.c create mode 100644 include/linux/lightnvm.h create mode 100644 include/uapi/linux/lightnvm.h diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt index df1b25eb8382..8a44d44cf901 100644 --- a/Documentation/ioctl/ioctl-number.txt +++ b/Documentation/ioctl/ioctl-number.txt @@ -149,6 +149,7 @@ Code Seq#(hex) Include File Comments 'K' all linux/kd.h 'L' 00-1F linux/loop.h conflict! 'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict! +'L' 20-2F linux/lightnvm.h 'L' E0-FF linux/ppdd.h encrypted disk device driver 'M' all linux/soundcard.h conflict! diff --git a/MAINTAINERS b/MAINTAINERS index f1d5a59432fc..d8be12c57f84 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6243,6 +6243,14 @@ F: drivers/nvdimm/pmem.c F: include/linux/pmem.h F: arch/*/include/asm/pmem.h +LIGHTNVM PLATFORM SUPPORT +M: Matias Bjorling +W: http://github/OpenChannelSSD +S: Maintained +F: drivers/lightnvm/ +F: include/linux/lightnvm.h +F: include/uapi/linux/lightnvm.h + LINUX FOR IBM pSERIES (RS/6000) M: Paul Mackerras W: http://www.ibm.com/linux/ltc/projects/ppc diff --git a/drivers/Kconfig b/drivers/Kconfig index e69ec82ac80a..3a5ab4d5873d 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -44,6 +44,8 @@ source "drivers/net/Kconfig" source "drivers/isdn/Kconfig" +source "drivers/lightnvm/Kconfig" + # input before char - char/joystick depends on it. As does USB. source "drivers/input/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index 42f9dd5f07c8..7f1b7c5a1cfd 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -70,6 +70,7 @@ obj-$(CONFIG_NUBUS) += nubus/ obj-y += macintosh/ obj-$(CONFIG_IDE) += ide/ obj-$(CONFIG_SCSI) += scsi/ +obj-$(CONFIG_NVM) += lightnvm/ obj-y += nvme/ obj-$(CONFIG_ATA) += ata/ obj-$(CONFIG_TARGET_CORE) += target/ diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig new file mode 100644 index 000000000000..d4f309f127cd --- /dev/null +++ b/drivers/lightnvm/Kconfig @@ -0,0 +1,28 @@ +# +# 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. + +endif # NVM diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile new file mode 100644 index 000000000000..38185e990d5d --- /dev/null +++ b/drivers/lightnvm/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for Open-Channel SSDs. +# + +obj-$(CONFIG_NVM) := core.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 + * + * 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 + +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 "); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION("0.1"); +module_init(nvm_mod_init); +module_exit(nvm_mod_exit); diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h new file mode 100644 index 000000000000..122b176600fa --- /dev/null +++ b/include/linux/lightnvm.h @@ -0,0 +1,522 @@ +#ifndef NVM_H +#define NVM_H + +enum { + NVM_IO_OK = 0, + NVM_IO_REQUEUE = 1, + NVM_IO_DONE = 2, + NVM_IO_ERR = 3, + + NVM_IOTYPE_NONE = 0, + NVM_IOTYPE_GC = 1, +}; + +#ifdef CONFIG_NVM + +#include +#include +#include +#include + +enum { + /* HW Responsibilities */ + NVM_RSP_L2P = 1 << 0, + NVM_RSP_ECC = 1 << 1, + + /* Physical Adressing Mode */ + NVM_ADDRMODE_LINEAR = 0, + NVM_ADDRMODE_CHANNEL = 1, + + /* Plane programming mode for LUN */ + NVM_PLANE_SINGLE = 0, + NVM_PLANE_DOUBLE = 1, + NVM_PLANE_QUAD = 2, + + /* Status codes */ + NVM_RSP_SUCCESS = 0x0, + NVM_RSP_NOT_CHANGEABLE = 0x1, + NVM_RSP_ERR_FAILWRITE = 0x40ff, + NVM_RSP_ERR_EMPTYPAGE = 0x42ff, + + /* Device opcodes */ + NVM_OP_HBREAD = 0x02, + NVM_OP_HBWRITE = 0x81, + NVM_OP_PWRITE = 0x91, + NVM_OP_PREAD = 0x92, + NVM_OP_ERASE = 0x90, + + /* PPA Command Flags */ + NVM_IO_SNGL_ACCESS = 0x0, + NVM_IO_DUAL_ACCESS = 0x1, + NVM_IO_QUAD_ACCESS = 0x2, + + NVM_IO_SUSPEND = 0x80, + NVM_IO_SLC_MODE = 0x100, + NVM_IO_SCRAMBLE_DISABLE = 0x200, +}; + +struct nvm_id_group { + u8 mtype; + u8 fmtype; + u16 res16; + u8 num_ch; + u8 num_lun; + u8 num_pln; + u16 num_blk; + u16 num_pg; + u16 fpg_sz; + u16 csecs; + u16 sos; + u32 trdt; + u32 trdm; + u32 tprt; + u32 tprm; + u32 tbet; + u32 tbem; + u32 mpos; + u16 cpar; + u8 res[913]; +} __packed; + +struct nvm_addr_format { + u8 ch_offset; + u8 ch_len; + u8 lun_offset; + u8 lun_len; + u8 pln_offset; + u8 pln_len; + u8 blk_offset; + u8 blk_len; + u8 pg_offset; + u8 pg_len; + u8 sect_offset; + u8 sect_len; + u8 res[4]; +}; + +struct nvm_id { + u8 ver_id; + u8 vmnt; + u8 cgrps; + u8 res[5]; + u32 cap; + u32 dom; + struct nvm_addr_format ppaf; + u8 ppat; + u8 resv[224]; + struct nvm_id_group groups[4]; +} __packed; + +struct nvm_target { + struct list_head list; + struct nvm_tgt_type *type; + struct gendisk *disk; +}; + +struct nvm_tgt_instance { + struct nvm_tgt_type *tt; +}; + +#define ADDR_EMPTY (~0ULL) + +#define NVM_VERSION_MAJOR 1 +#define NVM_VERSION_MINOR 0 +#define NVM_VERSION_PATCH 0 + +#define NVM_SEC_BITS (8) +#define NVM_PL_BITS (6) +#define NVM_PG_BITS (16) +#define NVM_BLK_BITS (16) +#define NVM_LUN_BITS (10) +#define NVM_CH_BITS (8) + +struct ppa_addr { + union { + /* Channel-based PPA format in nand 4x2x2x2x8x10 */ + struct { + sector_t ch : 4; + sector_t sec : 2; /* 4 sectors per page */ + sector_t pl : 2; /* 4 planes per LUN */ + sector_t lun : 2; /* 4 LUNs per channel */ + sector_t pg : 8; /* 256 pages per block */ + sector_t blk : 10;/* 1024 blocks per plane */ + sector_t resved : 36; + } chnl; + + /* Generic structure for all addresses */ + struct { + sector_t sec : NVM_SEC_BITS; + sector_t pl : NVM_PL_BITS; + sector_t pg : NVM_PG_BITS; + sector_t blk : NVM_BLK_BITS; + sector_t lun : NVM_LUN_BITS; + sector_t ch : NVM_CH_BITS; + } g; + + sector_t ppa; + }; +} __packed; + +struct nvm_rq { + struct nvm_tgt_instance *ins; + struct nvm_dev *dev; + + struct bio *bio; + + union { + struct ppa_addr ppa_addr; + dma_addr_t dma_ppa_list; + }; + + struct ppa_addr *ppa_list; + + void *metadata; + dma_addr_t dma_metadata; + + uint8_t opcode; + uint16_t nr_pages; + uint16_t flags; +}; + +static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu) +{ + return pdu - sizeof(struct nvm_rq); +} + +static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata) +{ + return rqdata + 1; +} + +struct nvm_block; + +typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *); +typedef int (nvm_bb_update_fn)(u32, void *, unsigned int, void *); +typedef int (nvm_id_fn)(struct request_queue *, struct nvm_id *); +typedef int (nvm_get_l2p_tbl_fn)(struct request_queue *, u64, u32, + nvm_l2p_update_fn *, void *); +typedef int (nvm_op_bb_tbl_fn)(struct request_queue *, int, unsigned int, + nvm_bb_update_fn *, void *); +typedef int (nvm_op_set_bb_fn)(struct request_queue *, struct nvm_rq *, int); +typedef int (nvm_submit_io_fn)(struct request_queue *, struct nvm_rq *); +typedef int (nvm_erase_blk_fn)(struct request_queue *, struct nvm_rq *); +typedef void *(nvm_create_dma_pool_fn)(struct request_queue *, char *); +typedef void (nvm_destroy_dma_pool_fn)(void *); +typedef void *(nvm_dev_dma_alloc_fn)(struct request_queue *, void *, gfp_t, + dma_addr_t *); +typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t); + +struct nvm_dev_ops { + nvm_id_fn *identity; + nvm_get_l2p_tbl_fn *get_l2p_tbl; + nvm_op_bb_tbl_fn *get_bb_tbl; + nvm_op_set_bb_fn *set_bb; + + nvm_submit_io_fn *submit_io; + nvm_erase_blk_fn *erase_block; + + nvm_create_dma_pool_fn *create_dma_pool; + nvm_destroy_dma_pool_fn *destroy_dma_pool; + nvm_dev_dma_alloc_fn *dev_dma_alloc; + nvm_dev_dma_free_fn *dev_dma_free; + + uint8_t max_phys_sect; +}; + +struct nvm_lun { + int id; + + int lun_id; + int chnl_id; + + unsigned int nr_free_blocks; /* Number of unused blocks */ + struct nvm_block *blocks; + + spinlock_t lock; +}; + +struct nvm_block { + struct list_head list; + struct nvm_lun *lun; + unsigned long id; + + void *priv; + int type; +}; + +struct nvm_dev { + struct nvm_dev_ops *ops; + + struct list_head devices; + struct list_head online_targets; + + /* Media manager */ + struct nvmm_type *mt; + void *mp; + + /* Device information */ + int nr_chnls; + int nr_planes; + int luns_per_chnl; + int sec_per_pg; /* only sectors for a single page */ + int pgs_per_blk; + int blks_per_lun; + int sec_size; + int oob_size; + int addr_mode; + struct nvm_addr_format addr_format; + + /* Calculated/Cached values. These do not reflect the actual usable + * blocks at run-time. + */ + int max_rq_size; + int plane_mode; /* drive device in single, double or quad mode */ + + int sec_per_pl; /* all sectors across planes */ + int sec_per_blk; + int sec_per_lun; + + unsigned long total_pages; + unsigned long total_blocks; + int nr_luns; + unsigned max_pages_per_blk; + + void *ppalist_pool; + + struct nvm_id identity; + + /* Backend device */ + struct request_queue *q; + char name[DISK_NAME_LEN]; +}; + +/* fallback conversion */ +static struct ppa_addr __generic_to_linear_addr(struct nvm_dev *dev, + struct ppa_addr r) +{ + struct ppa_addr l; + + l.ppa = r.g.sec + + r.g.pg * dev->sec_per_pg + + r.g.blk * (dev->pgs_per_blk * + dev->sec_per_pg) + + r.g.lun * (dev->blks_per_lun * + dev->pgs_per_blk * + dev->sec_per_pg) + + r.g.ch * (dev->blks_per_lun * + dev->pgs_per_blk * + dev->luns_per_chnl * + dev->sec_per_pg); + + return l; +} + +/* fallback conversion */ +static struct ppa_addr __linear_to_generic_addr(struct nvm_dev *dev, + struct ppa_addr r) +{ + struct ppa_addr l; + int secs, pgs, blks, luns; + sector_t ppa = r.ppa; + + l.ppa = 0; + + div_u64_rem(ppa, dev->sec_per_pg, &secs); + l.g.sec = secs; + + sector_div(ppa, dev->sec_per_pg); + div_u64_rem(ppa, dev->sec_per_blk, &pgs); + l.g.pg = pgs; + + sector_div(ppa, dev->pgs_per_blk); + div_u64_rem(ppa, dev->blks_per_lun, &blks); + l.g.blk = blks; + + sector_div(ppa, dev->blks_per_lun); + div_u64_rem(ppa, dev->luns_per_chnl, &luns); + l.g.lun = luns; + + sector_div(ppa, dev->luns_per_chnl); + l.g.ch = ppa; + + return l; +} + +static struct ppa_addr __generic_to_chnl_addr(struct ppa_addr r) +{ + struct ppa_addr l; + + l.ppa = 0; + + l.chnl.sec = r.g.sec; + l.chnl.pl = r.g.pl; + l.chnl.pg = r.g.pg; + l.chnl.blk = r.g.blk; + l.chnl.lun = r.g.lun; + l.chnl.ch = r.g.ch; + + return l; +} + +static struct ppa_addr __chnl_to_generic_addr(struct ppa_addr r) +{ + struct ppa_addr l; + + l.ppa = 0; + + l.g.sec = r.chnl.sec; + l.g.pl = r.chnl.pl; + l.g.pg = r.chnl.pg; + l.g.blk = r.chnl.blk; + l.g.lun = r.chnl.lun; + l.g.ch = r.chnl.ch; + + return l; +} + +static inline struct ppa_addr addr_to_generic_mode(struct nvm_dev *dev, + struct ppa_addr gppa) +{ + switch (dev->addr_mode) { + case NVM_ADDRMODE_LINEAR: + return __linear_to_generic_addr(dev, gppa); + case NVM_ADDRMODE_CHANNEL: + return __chnl_to_generic_addr(gppa); + default: + BUG(); + } + return gppa; +} + +static inline struct ppa_addr generic_to_addr_mode(struct nvm_dev *dev, + struct ppa_addr gppa) +{ + switch (dev->addr_mode) { + case NVM_ADDRMODE_LINEAR: + return __generic_to_linear_addr(dev, gppa); + case NVM_ADDRMODE_CHANNEL: + return __generic_to_chnl_addr(gppa); + default: + BUG(); + } + return gppa; +} + +static inline int ppa_empty(struct ppa_addr ppa_addr) +{ + return (ppa_addr.ppa == ADDR_EMPTY); +} + +static inline void ppa_set_empty(struct ppa_addr *ppa_addr) +{ + ppa_addr->ppa = ADDR_EMPTY; +} + +static inline struct ppa_addr block_to_ppa(struct nvm_dev *dev, + struct nvm_block *blk) +{ + struct ppa_addr ppa; + struct nvm_lun *lun = blk->lun; + + ppa.ppa = 0; + ppa.g.blk = blk->id % dev->blks_per_lun; + ppa.g.lun = lun->lun_id; + ppa.g.ch = lun->chnl_id; + + return ppa; +} + +typedef void (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *); +typedef sector_t (nvm_tgt_capacity_fn)(void *); +typedef int (nvm_tgt_end_io_fn)(struct nvm_rq *, int); +typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int); +typedef void (nvm_tgt_exit_fn)(void *); + +struct nvm_tgt_type { + const char *name; + unsigned int version[3]; + + /* target entry points */ + nvm_tgt_make_rq_fn *make_rq; + nvm_tgt_capacity_fn *capacity; + nvm_tgt_end_io_fn *end_io; + + /* module-specific init/teardown */ + nvm_tgt_init_fn *init; + nvm_tgt_exit_fn *exit; + + /* For internal use */ + struct list_head list; +}; + +extern int nvm_register_target(struct nvm_tgt_type *); +extern void nvm_unregister_target(struct nvm_tgt_type *); + +extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *); +extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t); + +typedef int (nvmm_register_fn)(struct nvm_dev *); +typedef void (nvmm_unregister_fn)(struct nvm_dev *); +typedef struct nvm_block *(nvmm_get_blk_fn)(struct nvm_dev *, + struct nvm_lun *, unsigned long); +typedef void (nvmm_put_blk_fn)(struct nvm_dev *, struct nvm_block *); +typedef int (nvmm_open_blk_fn)(struct nvm_dev *, struct nvm_block *); +typedef int (nvmm_close_blk_fn)(struct nvm_dev *, struct nvm_block *); +typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *); +typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *); +typedef int (nvmm_end_io_fn)(struct nvm_rq *, int); +typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *, + unsigned long); +typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int); +typedef void (nvmm_free_blocks_print_fn)(struct nvm_dev *); + +struct nvmm_type { + const char *name; + unsigned int version[3]; + + nvmm_register_fn *register_mgr; + nvmm_unregister_fn *unregister_mgr; + + /* Block administration callbacks */ + nvmm_get_blk_fn *get_blk; + nvmm_put_blk_fn *put_blk; + nvmm_open_blk_fn *open_blk; + nvmm_close_blk_fn *close_blk; + nvmm_flush_blk_fn *flush_blk; + + nvmm_submit_io_fn *submit_io; + nvmm_end_io_fn *end_io; + nvmm_erase_blk_fn *erase_blk; + + /* Configuration management */ + nvmm_get_lun_fn *get_lun; + + /* Statistics */ + nvmm_free_blocks_print_fn *free_blocks_print; + struct list_head list; +}; + +extern int nvm_register_mgr(struct nvmm_type *); +extern void nvm_unregister_mgr(struct nvmm_type *); + +extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *, + unsigned long); +extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *); + +extern int nvm_register(struct request_queue *, char *, + struct nvm_dev_ops *); +extern void nvm_unregister(char *); + +extern int nvm_submit_io(struct nvm_dev *, struct nvm_rq *); +extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *); +#else /* CONFIG_NVM */ +struct nvm_dev_ops; + +static inline int nvm_register(struct request_queue *q, char *disk_name, + struct nvm_dev_ops *ops) +{ + return -EINVAL; +} +static inline void nvm_unregister(char *disk_name) {} +#endif /* CONFIG_NVM */ +#endif /* LIGHTNVM.H */ diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h new file mode 100644 index 000000000000..928f98997d8a --- /dev/null +++ b/include/uapi/linux/lightnvm.h @@ -0,0 +1,130 @@ +/* + * Copyright (C) 2015 CNEX Labs. All rights reserved. + * + * 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. + */ + +#ifndef _UAPI_LINUX_LIGHTNVM_H +#define _UAPI_LINUX_LIGHTNVM_H + +#ifdef __KERNEL__ +#include +#include +#else /* __KERNEL__ */ +#include +#include +#define DISK_NAME_LEN 32 +#endif /* __KERNEL__ */ + +#include +#include + +#define NVM_TTYPE_NAME_MAX 48 +#define NVM_TTYPE_MAX 63 + +#define NVM_CTRL_FILE "/dev/lightnvm/control" + +struct nvm_ioctl_info_tgt { + __u32 version[3]; + __u32 reserved; + char tgtname[NVM_TTYPE_NAME_MAX]; +}; + +struct nvm_ioctl_info { + __u32 version[3]; /* in/out - major, minor, patch */ + __u16 tgtsize; /* number of targets */ + __u16 reserved16; /* pad to 4K page */ + __u32 reserved[12]; + struct nvm_ioctl_info_tgt tgts[NVM_TTYPE_MAX]; +}; + +enum { + NVM_DEVICE_ACTIVE = 1 << 0, +}; + +struct nvm_ioctl_device_info { + char devname[DISK_NAME_LEN]; + char bmname[NVM_TTYPE_NAME_MAX]; + __u32 bmversion[3]; + __u32 flags; + __u32 reserved[8]; +}; + +struct nvm_ioctl_get_devices { + __u32 nr_devices; + __u32 reserved[31]; + struct nvm_ioctl_device_info info[31]; +}; + +struct nvm_ioctl_create_simple { + __u32 lun_begin; + __u32 lun_end; +}; + +enum { + NVM_CONFIG_TYPE_SIMPLE = 0, +}; + +struct nvm_ioctl_create_conf { + __u32 type; + union { + struct nvm_ioctl_create_simple s; + }; +}; + +struct nvm_ioctl_create { + char dev[DISK_NAME_LEN]; /* open-channel SSD device */ + char tgttype[NVM_TTYPE_NAME_MAX]; /* target type name */ + char tgtname[DISK_NAME_LEN]; /* dev to expose target as */ + + __u32 flags; + + struct nvm_ioctl_create_conf conf; +}; + +struct nvm_ioctl_remove { + char tgtname[DISK_NAME_LEN]; + + __u32 flags; +}; + + +/* The ioctl type, 'L', 0x20 - 0x2F documented in ioctl-number.txt */ +enum { + /* top level cmds */ + NVM_INFO_CMD = 0x20, + NVM_GET_DEVICES_CMD, + + /* device level cmds */ + NVM_DEV_CREATE_CMD, + NVM_DEV_REMOVE_CMD, +}; + +#define NVM_IOCTL 'L' /* 0x4c */ + +#define NVM_INFO _IOWR(NVM_IOCTL, NVM_INFO_CMD, \ + struct nvm_ioctl_info) +#define NVM_GET_DEVICES _IOR(NVM_IOCTL, NVM_GET_DEVICES_CMD, \ + struct nvm_ioctl_get_devices) +#define NVM_DEV_CREATE _IOW(NVM_IOCTL, NVM_DEV_CREATE_CMD, \ + struct nvm_ioctl_create) +#define NVM_DEV_REMOVE _IOW(NVM_IOCTL, NVM_DEV_REMOVE_CMD, \ + struct nvm_ioctl_remove) + +#define NVM_VERSION_MAJOR 1 +#define NVM_VERSION_MINOR 0 +#define NVM_VERSION_PATCHLEVEL 0 + +#endif -- cgit v1.2.3 From 48add0f5a6f46919dd307575aad6ea3de7c9cb2a Mon Sep 17 00:00:00 2001 From: Matias Bjørling Date: Wed, 28 Oct 2015 19:54:56 +0100 Subject: gennvm: Generic NVM manager MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The implementation for Open-Channel SSDs is divided into media management and targets. This patch implements a generic media manager for open-channel SSDs. After a media manager has been initialized, single or multiple targets can be instantiated with the media managed as the backend. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/Kconfig | 7 + drivers/lightnvm/Makefile | 1 + drivers/lightnvm/gennvm.c | 485 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/lightnvm/gennvm.h | 46 +++++ 4 files changed, 539 insertions(+) create mode 100644 drivers/lightnvm/gennvm.c create mode 100644 drivers/lightnvm/gennvm.h diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig index d4f309f127cd..2a27971eae1a 100644 --- a/drivers/lightnvm/Kconfig +++ b/drivers/lightnvm/Kconfig @@ -25,4 +25,11 @@ config NVM_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. + endif # NVM diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile index 38185e990d5d..e2428e04e7b8 100644 --- a/drivers/lightnvm/Makefile +++ b/drivers/lightnvm/Makefile @@ -3,3 +3,4 @@ # obj-$(CONFIG_NVM) := core.o +obj-$(CONFIG_NVM_GENNVM) += gennvm.o 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 + * + * 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 + * + * 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 +#include + +#include + +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_ */ -- cgit v1.2.3 From ae1519ec448bc31a7fe7369b66e7c78872f91e84 Mon Sep 17 00:00:00 2001 From: Matias Bjørling Date: Wed, 28 Oct 2015 19:54:57 +0100 Subject: rrpc: Round-robin sector target with cost-based gc MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This target allows an Open-Channel SSD to be exposed asas a block device. It implements a round-robin approach for sector allocation, together with a greedy cost-based garbage collector. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/Kconfig | 7 + drivers/lightnvm/Makefile | 1 + drivers/lightnvm/rrpc.c | 1324 +++++++++++++++++++++++++++++++++++++++++++++ drivers/lightnvm/rrpc.h | 239 ++++++++ 4 files changed, 1571 insertions(+) create mode 100644 drivers/lightnvm/rrpc.c create mode 100644 drivers/lightnvm/rrpc.h diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig index 2a27971eae1a..a16bf56d3f28 100644 --- a/drivers/lightnvm/Kconfig +++ b/drivers/lightnvm/Kconfig @@ -32,4 +32,11 @@ config NVM_GENNVM 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 index e2428e04e7b8..7e0f42acb737 100644 --- a/drivers/lightnvm/Makefile +++ b/drivers/lightnvm/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_NVM) := core.o obj-$(CONFIG_NVM_GENNVM) += gennvm.o +obj-$(CONFIG_NVM_RRPC) += rrpc.o diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c new file mode 100644 index 000000000000..22fcd629565d --- /dev/null +++ b/drivers/lightnvm/rrpc.c @@ -0,0 +1,1324 @@ +/* + * Copyright (C) 2015 IT University of Copenhagen + * 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. + * + * 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 sector_t 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, + sector_t 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; + sector_t 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, sector_t 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 sector_t rrpc_alloc_addr(struct rrpc *rrpc, struct rrpc_block *rblk) +{ + sector_t 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; + sector_t 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; + sector_t 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..b5df08d7b8bf --- /dev/null +++ b/drivers/lightnvm/rrpc.h @@ -0,0 +1,239 @@ +/* + * Copyright (C) 2015 IT University of Copenhagen + * 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. + * + * Implementation of a Round-robin page-based Hybrid FTL for Open-channel SSDs. + */ + +#ifndef RRPC_H_ +#define RRPC_H_ + +#include +#include +#include +#include +#include +#include + +#include + +/* 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; + + sector_t 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 { + sector_t addr; + struct rrpc_block *rblk; +}; + +/* Physical to logical mapping */ +struct rrpc_rev_addr { + sector_t 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_ */ -- cgit v1.2.3 From ca0640850e43f5f80c6029e2895b119b705f23bd Mon Sep 17 00:00:00 2001 From: Matias Bjørling Date: Thu, 29 Oct 2015 17:57:29 +0900 Subject: nvme: LightNVM support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The first generation of Open-Channel SSDs is based on NVMe. The NVMe driver is extended with support for the LightNVM command set. Detection is made through PCI IDs. Current supported devices are the qemu nvme simulator and CNEX Labs Westlake SSD. The qemu nvme enables support through vendor specific bits in the namespace identification and the CNEX Labs Westlake SSD implements a LightNVM compatible firmware and is detected using the same method as qemu. After detection, vendor specific codes are used to identify the device and enumerate supported features. Reviewed-by: Keith Busch Signed-off-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/nvme/host/Makefile | 2 +- drivers/nvme/host/lightnvm.c | 526 +++++++++++++++++++++++++++++++++++++++++++ drivers/nvme/host/nvme.h | 10 + drivers/nvme/host/pci.c | 39 +++- 4 files changed, 565 insertions(+), 12 deletions(-) create mode 100644 drivers/nvme/host/lightnvm.c diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile index cfb6679ec245..219dc206fa5f 100644 --- a/drivers/nvme/host/Makefile +++ b/drivers/nvme/host/Makefile @@ -1,4 +1,4 @@ obj-$(CONFIG_BLK_DEV_NVME) += nvme.o -nvme-y += pci.o scsi.o +nvme-y += pci.o scsi.o lightnvm.o diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c new file mode 100644 index 000000000000..133c8396ec93 --- /dev/null +++ b/drivers/nvme/host/lightnvm.c @@ -0,0 +1,526 @@ +/* + * nvme-lightnvm.c - LightNVM NVMe device + * + * Copyright (C) 2014-2015 IT University of Copenhagen + * 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 "nvme.h" + +#ifdef CONFIG_NVM + +#include +#include +#include +#include + +enum nvme_nvm_admin_opcode { + nvme_nvm_admin_identity = 0xe2, + nvme_nvm_admin_get_l2p_tbl = 0xea, + nvme_nvm_admin_get_bb_tbl = 0xf2, + nvme_nvm_admin_set_bb_tbl = 0xf1, +}; + +struct nvme_nvm_hb_rw { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd2; + __le64 metadata; + __le64 prp1; + __le64 prp2; + __le64 spba; + __le16 length; + __le16 control; + __le32 dsmgmt; + __le64 slba; +}; + +struct nvme_nvm_ph_rw { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd2; + __le64 metadata; + __le64 prp1; + __le64 prp2; + __le64 spba; + __le16 length; + __le16 control; + __le32 dsmgmt; + __le64 resv; +}; + +struct nvme_nvm_identity { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd[2]; + __le64 prp1; + __le64 prp2; + __le32 chnl_off; + __u32 rsvd11[5]; +}; + +struct nvme_nvm_l2ptbl { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __le32 cdw2[4]; + __le64 prp1; + __le64 prp2; + __le64 slba; + __le32 nlb; + __le16 cdw14[6]; +}; + +struct nvme_nvm_bbtbl { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd[2]; + __le64 prp1; + __le64 prp2; + __le32 prp1_len; + __le32 prp2_len; + __le32 lbb; + __u32 rsvd11[3]; +}; + +struct nvme_nvm_erase_blk { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd[2]; + __le64 prp1; + __le64 prp2; + __le64 spba; + __le16 length; + __le16 control; + __le32 dsmgmt; + __le64 resv; +}; + +struct nvme_nvm_command { + union { + struct nvme_common_command common; + struct nvme_nvm_identity identity; + struct nvme_nvm_hb_rw hb_rw; + struct nvme_nvm_ph_rw ph_rw; + struct nvme_nvm_l2ptbl l2p; + struct nvme_nvm_bbtbl get_bb; + struct nvme_nvm_bbtbl set_bb; + struct nvme_nvm_erase_blk erase; + }; +}; + +struct nvme_nvm_id_group { + __u8 mtype; + __u8 fmtype; + __le16 res16; + __u8 num_ch; + __u8 num_lun; + __u8 num_pln; + __le16 num_blk; + __le16 num_pg; + __le16 fpg_sz; + __le16 csecs; + __le16 sos; + __le32 trdt; + __le32 trdm; + __le32 tprt; + __le32 tprm; + __le32 tbet; + __le32 tbem; + __le32 mpos; + __le16 cpar; + __u8 reserved[913]; +} __packed; + +struct nvme_nvm_addr_format { + __u8 ch_offset; + __u8 ch_len; + __u8 lun_offset; + __u8 lun_len; + __u8 pln_offset; + __u8 pln_len; + __u8 blk_offset; + __u8 blk_len; + __u8 pg_offset; + __u8 pg_len; + __u8 sect_offset; + __u8 sect_len; + __u8 res[4]; +} __packed; + +struct nvme_nvm_id { + __u8 ver_id; + __u8 vmnt; + __u8 cgrps; + __u8 res[5]; + __le32 cap; + __le32 dom; + struct nvme_nvm_addr_format ppaf; + __u8 ppat; + __u8 resv[223]; + struct nvme_nvm_id_group groups[4]; +} __packed; + +/* + * Check we didn't inadvertently grow the command struct + */ +static inline void _nvme_nvm_check_size(void) +{ + BUILD_BUG_ON(sizeof(struct nvme_nvm_identity) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_hb_rw) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_ph_rw) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_bbtbl) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_l2ptbl) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64); + BUILD_BUG_ON(sizeof(struct nvme_nvm_id_group) != 960); + BUILD_BUG_ON(sizeof(struct nvme_nvm_addr_format) != 128); + BUILD_BUG_ON(sizeof(struct nvme_nvm_id) != 4096); +} + +static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id) +{ + struct nvme_nvm_id_group *src; + struct nvm_id_group *dst; + int i, end; + + end = min_t(u32, 4, nvm_id->cgrps); + + for (i = 0; i < end; i++) { + src = &nvme_nvm_id->groups[i]; + dst = &nvm_id->groups[i]; + + dst->mtype = src->mtype; + dst->fmtype = src->fmtype; + dst->num_ch = src->num_ch; + dst->num_lun = src->num_lun; + dst->num_pln = src->num_pln; + + dst->num_pg = le16_to_cpu(src->num_pg); + dst->num_blk = le16_to_cpu(src->num_blk); + dst->fpg_sz = le16_to_cpu(src->fpg_sz); + dst->csecs = le16_to_cpu(src->csecs); + dst->sos = le16_to_cpu(src->sos); + + dst->trdt = le32_to_cpu(src->trdt); + dst->trdm = le32_to_cpu(src->trdm); + dst->tprt = le32_to_cpu(src->tprt); + dst->tprm = le32_to_cpu(src->tprm); + dst->tbet = le32_to_cpu(src->tbet); + dst->tbem = le32_to_cpu(src->tbem); + dst->mpos = le32_to_cpu(src->mpos); + + dst->cpar = le16_to_cpu(src->cpar); + } + + return 0; +} + +static int nvme_nvm_identity(struct request_queue *q, struct nvm_id *nvm_id) +{ + struct nvme_ns *ns = q->queuedata; + struct nvme_nvm_id *nvme_nvm_id; + struct nvme_nvm_command c = {}; + int ret; + + c.identity.opcode = nvme_nvm_admin_identity; + c.identity.nsid = cpu_to_le32(ns->ns_id); + c.identity.chnl_off = 0; + + nvme_nvm_id = kmalloc(sizeof(struct nvme_nvm_id), GFP_KERNEL); + if (!nvme_nvm_id) + return -ENOMEM; + + ret = nvme_submit_sync_cmd(q, (struct nvme_command *)&c, nvme_nvm_id, + sizeof(struct nvme_nvm_id)); + if (ret) { + ret = -EIO; + goto out; + } + + nvm_id->ver_id = nvme_nvm_id->ver_id; + nvm_id->vmnt = nvme_nvm_id->vmnt; + nvm_id->cgrps = nvme_nvm_id->cgrps; + nvm_id->cap = le32_to_cpu(nvme_nvm_id->cap); + nvm_id->dom = le32_to_cpu(nvme_nvm_id->dom); + + ret = init_grps(nvm_id, nvme_nvm_id); +out: + kfree(nvme_nvm_id); + return ret; +} + +static int nvme_nvm_get_l2p_tbl(struct request_queue *q, u64 slba, u32 nlb, + nvm_l2p_update_fn *update_l2p, void *priv) +{ + struct nvme_ns *ns = q->queuedata; + struct nvme_dev *dev = ns->dev; + struct nvme_nvm_command c = {}; + u32 len = queue_max_hw_sectors(q) << 9; + u64 nlb_pr_rq = len / sizeof(u64); + u64 cmd_slba = slba; + void *entries; + int ret = 0; + + c.l2p.opcode = nvme_nvm_admin_get_l2p_tbl; + c.l2p.nsid = cpu_to_le32(ns->ns_id); + entries = kmalloc(len, GFP_KERNEL); + if (!entries) + return -ENOMEM; + + while (nlb) { + u32 cmd_nlb = min_t(u32, nlb_pr_rq, nlb); + + c.l2p.slba = cpu_to_le64(cmd_slba); + c.l2p.nlb = cpu_to_le32(cmd_nlb); + + ret = nvme_submit_sync_cmd(q, (struct nvme_command *)&c, + entries, len); + if (ret) { + dev_err(dev->dev, "L2P table transfer failed (%d)\n", + ret); + ret = -EIO; + goto out; + } + + if (update_l2p(cmd_slba, cmd_nlb, entries, priv)) { + ret = -EINTR; + goto out; + } + + cmd_slba += cmd_nlb; + nlb -= cmd_nlb; + } + +out: + kfree(entries); + return ret; +} + +static int nvme_nvm_get_bb_tbl(struct request_queue *q, int lunid, + unsigned int nr_blocks, + nvm_bb_update_fn *update_bbtbl, void *priv) +{ + struct nvme_ns *ns = q->queuedata; + struct nvme_dev *dev = ns->dev; + struct nvme_nvm_command c = {}; + void *bb_bitmap; + u16 bb_bitmap_size; + int ret = 0; + + c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl; + c.get_bb.nsid = cpu_to_le32(ns->ns_id); + c.get_bb.lbb = cpu_to_le32(lunid); + bb_bitmap_size = ((nr_blocks >> 15) + 1) * PAGE_SIZE; + bb_bitmap = kmalloc(bb_bitmap_size, GFP_KERNEL); + if (!bb_bitmap) + return -ENOMEM; + + bitmap_zero(bb_bitmap, nr_blocks); + + ret = nvme_submit_sync_cmd(q, (struct nvme_command *)&c, bb_bitmap, + bb_bitmap_size); + if (ret) { + dev_err(dev->dev, "get bad block table failed (%d)\n", ret); + ret = -EIO; + goto out; + } + + ret = update_bbtbl(lunid, bb_bitmap, nr_blocks, priv); + if (ret) { + ret = -EINTR; + goto out; + } + +out: + kfree(bb_bitmap); + return ret; +} + +static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd, + struct nvme_ns *ns, struct nvme_nvm_command *c) +{ + c->ph_rw.opcode = rqd->opcode; + c->ph_rw.nsid = cpu_to_le32(ns->ns_id); + c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa); + c->ph_rw.control = cpu_to_le16(rqd->flags); + c->ph_rw.length = cpu_to_le16(rqd->nr_pages - 1); + + if (rqd->opcode == NVM_OP_HBWRITE || rqd->opcode == NVM_OP_HBREAD) + c->hb_rw.slba = cpu_to_le64(nvme_block_nr(ns, + rqd->bio->bi_iter.bi_sector)); +} + +static void nvme_nvm_end_io(struct request *rq, int error) +{ + struct nvm_rq *rqd = rq->end_io_data; + struct nvm_dev *dev = rqd->dev; + + if (dev->mt->end_io(rqd, error)) + pr_err("nvme: err status: %x result: %lx\n", + rq->errors, (unsigned long)rq->special); + + kfree(rq->cmd); + blk_mq_free_request(rq); +} + +static int nvme_nvm_submit_io(struct request_queue *q, struct nvm_rq *rqd) +{ + struct nvme_ns *ns = q->queuedata; + struct request *rq; + struct bio *bio = rqd->bio; + struct nvme_nvm_command *cmd; + + rq = blk_mq_alloc_request(q, bio_rw(bio), GFP_KERNEL, 0); + if (IS_ERR(rq)) + return -ENOMEM; + + cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL); + if (!cmd) { + blk_mq_free_request(rq); + return -ENOMEM; + } + + rq->cmd_type = REQ_TYPE_DRV_PRIV; + rq->ioprio = bio_prio(bio); + + if (bio_has_data(bio)) + rq->nr_phys_segments = bio_phys_segments(q, bio); + + rq->__data_len = bio->bi_iter.bi_size; + rq->bio = rq->biotail = bio; + + nvme_nvm_rqtocmd(rq, rqd, ns, cmd); + + rq->cmd = (unsigned char *)cmd; + rq->cmd_len = sizeof(struct nvme_nvm_command); + rq->special = (void *)0; + + rq->end_io_data = rqd; + + blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io); + + return 0; +} + +static int nvme_nvm_erase_block(struct request_queue *q, struct nvm_rq *rqd) +{ + struct nvme_ns *ns = q->queuedata; + struct nvme_nvm_command c = {}; + + c.erase.opcode = NVM_OP_ERASE; + c.erase.nsid = cpu_to_le32(ns->ns_id); + c.erase.spba = cpu_to_le64(rqd->ppa_addr.ppa); + c.erase.length = cpu_to_le16(rqd->nr_pages - 1); + + return nvme_submit_sync_cmd(q, (struct nvme_command *)&c, NULL, 0); +} + +static void *nvme_nvm_create_dma_pool(struct request_queue *q, char *name) +{ + struct nvme_ns *ns = q->queuedata; + struct nvme_dev *dev = ns->dev; + + return dma_pool_create(name, dev->dev, PAGE_SIZE, PAGE_SIZE, 0); +} + +static void nvme_nvm_destroy_dma_pool(void *pool) +{ + struct dma_pool *dma_pool = pool; + + dma_pool_destroy(dma_pool); +} + +static void *nvme_nvm_dev_dma_alloc(struct request_queue *q, void *pool, + gfp_t mem_flags, dma_addr_t *dma_handler) +{ + return dma_pool_alloc(pool, mem_flags, dma_handler); +} + +static void nvme_nvm_dev_dma_free(void *pool, void *ppa_list, + dma_addr_t dma_handler) +{ + dma_pool_free(pool, ppa_list, dma_handler); +} + +static struct nvm_dev_ops nvme_nvm_dev_ops = { + .identity = nvme_nvm_identity, + + .get_l2p_tbl = nvme_nvm_get_l2p_tbl, + + .get_bb_tbl = nvme_nvm_get_bb_tbl, + + .submit_io = nvme_nvm_submit_io, + .erase_block = nvme_nvm_erase_block, + + .create_dma_pool = nvme_nvm_create_dma_pool, + .destroy_dma_pool = nvme_nvm_destroy_dma_pool, + .dev_dma_alloc = nvme_nvm_dev_dma_alloc, + .dev_dma_free = nvme_nvm_dev_dma_free, + + .max_phys_sect = 64, +}; + +int nvme_nvm_register(struct request_queue *q, char *disk_name) +{ + return nvm_register(q, disk_name, &nvme_nvm_dev_ops); +} + +void nvme_nvm_unregister(struct request_queue *q, char *disk_name) +{ + nvm_unregister(disk_name); +} + +int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id) +{ + struct nvme_dev *dev = ns->dev; + struct pci_dev *pdev = to_pci_dev(dev->dev); + + /* QEMU NVMe simulator - PCI ID + Vendor specific bit */ + if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == 0x5845 && + id->vs[0] == 0x1) + return 1; + + /* CNEX Labs - PCI ID + Vendor specific bit */ + if (pdev->vendor == 0x1d1d && pdev->device == 0x2807 && + id->vs[0] == 0x1) + return 1; + + return 0; +} +#else +int nvme_nvm_register(struct request_queue *q, char *disk_name) +{ + return 0; +} +void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {}; +int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id) +{ + return 0; +} +#endif /* CONFIG_NVM */ diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index c1f41bf3c0f2..fdb4e5bad9ac 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -22,6 +22,11 @@ extern unsigned char nvme_io_timeout; #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ) +enum { + NVME_NS_LBA = 0, + NVME_NS_LIGHTNVM = 1, +}; + /* * Represents an NVM Express device. Each nvme_dev is a PCI function. */ @@ -84,6 +89,7 @@ struct nvme_ns { u16 ms; bool ext; u8 pi_type; + int type; u64 mode_select_num_blocks; u32 mode_select_block_len; }; @@ -130,4 +136,8 @@ int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr); int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg); int nvme_sg_get_version_num(int __user *ip); +int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id); +int nvme_nvm_register(struct request_queue *q, char *disk_name); +void nvme_nvm_unregister(struct request_queue *q, char *disk_name); + #endif /* _NVME_H */ diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 22d83752ae87..ff47a8b62f68 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1948,6 +1948,9 @@ static void nvme_free_ns(struct kref *kref) { struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); + if (ns->type == NVME_NS_LIGHTNVM) + nvme_nvm_unregister(ns->queue, ns->disk->disk_name); + spin_lock(&dev_list_lock); ns->disk->private_data = NULL; spin_unlock(&dev_list_lock); @@ -2017,6 +2020,16 @@ static int nvme_revalidate_disk(struct gendisk *disk) return -ENODEV; } + if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) { + if (nvme_nvm_register(ns->queue, disk->disk_name)) { + dev_warn(dev->dev, + "%s: LightNVM init failure\n", __func__); + kfree(id); + return -ENODEV; + } + ns->type = NVME_NS_LIGHTNVM; + } + old_ms = ns->ms; lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK; ns->lba_shift = id->lbaf[lbaf].ds; @@ -2048,7 +2061,9 @@ static int nvme_revalidate_disk(struct gendisk *disk) !ns->ext) nvme_init_integrity(ns); - if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) + if ((ns->ms && !(ns->ms == 8 && ns->pi_type) && + !blk_get_integrity(disk)) || + ns->type == NVME_NS_LIGHTNVM) set_capacity(disk, 0); else set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); @@ -2171,17 +2186,19 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid) goto out_free_disk; kref_get(&dev->kref); - add_disk(ns->disk); - if (ns->ms) { - struct block_device *bd = bdget_disk(ns->disk, 0); - if (!bd) - return; - if (blkdev_get(bd, FMODE_READ, NULL)) { - bdput(bd); - return; + if (ns->type != NVME_NS_LIGHTNVM) { + add_disk(ns->disk); + if (ns->ms) { + struct block_device *bd = bdget_disk(ns->disk, 0); + if (!bd) + return; + if (blkdev_get(bd, FMODE_READ, NULL)) { + bdput(bd); + return; + } + blkdev_reread_part(bd); + blkdev_put(bd, FMODE_READ); } - blkdev_reread_part(bd); - blkdev_put(bd, FMODE_READ); } return; out_free_disk: -- cgit v1.2.3 From b7ceb7d50048d0dd4830f106f0fb7f5424031598 Mon Sep 17 00:00:00 2001 From: Matias Bjørling Date: Mon, 2 Nov 2015 17:12:27 +0100 Subject: lightnvm: refactor phys addrs type to u64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit For cases where CONFIG_LBDAF is not set. The struct ppa_addr exceeds its type on 32 bit architectures. ppa_addr requires a 64bit integer to hold the generic ppa format. We therefore refactor it to u64 and replaces the sector_t usages with u64 for physical addresses. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/rrpc.c | 17 ++++++++--------- drivers/lightnvm/rrpc.h | 6 +++--- include/linux/lightnvm.h | 28 ++++++++++++++-------------- 3 files changed, 25 insertions(+), 26 deletions(-) diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c index 22fcd629565d..64a888a5e9b3 100644 --- a/drivers/lightnvm/rrpc.c +++ b/drivers/lightnvm/rrpc.c @@ -116,15 +116,14 @@ static int block_is_full(struct rrpc *rrpc, struct rrpc_block *rblk) return (rblk->next_page == rrpc->dev->pgs_per_blk); } -static sector_t block_to_addr(struct rrpc *rrpc, struct rrpc_block *rblk) +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, - sector_t addr) +static struct ppa_addr rrpc_ppa_to_gaddr(struct nvm_dev *dev, u64 addr) { struct ppa_addr paddr; @@ -231,7 +230,7 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk) struct page *page; int slot; int nr_pgs_per_blk = rrpc->dev->pgs_per_blk; - sector_t phys_addr; + u64 phys_addr; DECLARE_COMPLETION_ONSTACK(wait); if (bitmap_full(rblk->invalid_pages, nr_pgs_per_blk)) @@ -464,7 +463,7 @@ static struct rrpc_lun *rrpc_get_lun_rr(struct rrpc *rrpc, int is_gc) } static struct rrpc_addr *rrpc_update_map(struct rrpc *rrpc, sector_t laddr, - struct rrpc_block *rblk, sector_t paddr) + struct rrpc_block *rblk, u64 paddr) { struct rrpc_addr *gp; struct rrpc_rev_addr *rev; @@ -486,9 +485,9 @@ static struct rrpc_addr *rrpc_update_map(struct rrpc *rrpc, sector_t laddr, return gp; } -static sector_t rrpc_alloc_addr(struct rrpc *rrpc, struct rrpc_block *rblk) +static u64 rrpc_alloc_addr(struct rrpc *rrpc, struct rrpc_block *rblk) { - sector_t addr = ADDR_EMPTY; + u64 addr = ADDR_EMPTY; spin_lock(&rblk->lock); if (block_is_full(rrpc, rblk)) @@ -516,7 +515,7 @@ static struct rrpc_addr *rrpc_map_page(struct rrpc *rrpc, sector_t laddr, struct rrpc_lun *rlun; struct rrpc_block *rblk; struct nvm_lun *lun; - sector_t paddr; + u64 paddr; rlun = rrpc_get_lun_rr(rrpc, is_gc); lun = rlun->parent; @@ -1144,7 +1143,7 @@ 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; - sector_t paddr, pladdr; + u64 paddr, pladdr; for (offset = 0; offset < dev->pgs_per_blk; offset++) { paddr = block_to_addr(rrpc, rblk) + offset; diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h index b5df08d7b8bf..a9696a06c38c 100644 --- a/drivers/lightnvm/rrpc.h +++ b/drivers/lightnvm/rrpc.h @@ -86,7 +86,7 @@ struct rrpc { struct nvm_dev *dev; struct gendisk *disk; - sector_t poffset; /* physical page offset */ + u64 poffset; /* physical page offset */ int lun_offset; int nr_luns; @@ -136,13 +136,13 @@ struct rrpc_block_gc { /* Logical to physical mapping */ struct rrpc_addr { - sector_t addr; + u64 addr; struct rrpc_block *rblk; }; /* Physical to logical mapping */ struct rrpc_rev_addr { - sector_t addr; + u64 addr; }; static inline sector_t rrpc_get_laddr(struct bio *bio) diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h index 122b176600fa..5ebd70d12f35 100644 --- a/include/linux/lightnvm.h +++ b/include/linux/lightnvm.h @@ -134,26 +134,26 @@ struct ppa_addr { union { /* Channel-based PPA format in nand 4x2x2x2x8x10 */ struct { - sector_t ch : 4; - sector_t sec : 2; /* 4 sectors per page */ - sector_t pl : 2; /* 4 planes per LUN */ - sector_t lun : 2; /* 4 LUNs per channel */ - sector_t pg : 8; /* 256 pages per block */ - sector_t blk : 10;/* 1024 blocks per plane */ - sector_t resved : 36; + u64 ch : 4; + u64 sec : 2; /* 4 sectors per page */ + u64 pl : 2; /* 4 planes per LUN */ + u64 lun : 2; /* 4 LUNs per channel */ + u64 pg : 8; /* 256 pages per block */ + u64 blk : 10;/* 1024 blocks per plane */ + u64 resved : 36; } chnl; /* Generic structure for all addresses */ struct { - sector_t sec : NVM_SEC_BITS; - sector_t pl : NVM_PL_BITS; - sector_t pg : NVM_PG_BITS; - sector_t blk : NVM_BLK_BITS; - sector_t lun : NVM_LUN_BITS; - sector_t ch : NVM_CH_BITS; + u64 sec : NVM_SEC_BITS; + u64 pl : NVM_PL_BITS; + u64 pg : NVM_PG_BITS; + u64 blk : NVM_BLK_BITS; + u64 lun : NVM_LUN_BITS; + u64 ch : NVM_CH_BITS; } g; - sector_t ppa; + u64 ppa; }; } __packed; -- cgit v1.2.3 From 5f436e5ef170e5d3301bf5777a3c7c048295db1c Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Wed, 4 Nov 2015 01:37:31 +0300 Subject: nvme: lightnvm: clean up a data type "nlb_pr_rq" can't be more than u32 because "len" is a u32. Later we truncate it to u32 anyway when we calculate min_t(). Signed-off-by: Dan Carpenter Signed-off-by: Jens Axboe --- drivers/nvme/host/lightnvm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c index 133c8396ec93..e0b7b95813bc 100644 --- a/drivers/nvme/host/lightnvm.c +++ b/drivers/nvme/host/lightnvm.c @@ -282,7 +282,7 @@ static int nvme_nvm_get_l2p_tbl(struct request_queue *q, u64 slba, u32 nlb, struct nvme_dev *dev = ns->dev; struct nvme_nvm_command c = {}; u32 len = queue_max_hw_sectors(q) << 9; - u64 nlb_pr_rq = len / sizeof(u64); + u32 nlb_pr_rq = len / sizeof(u64); u64 cmd_slba = slba; void *entries; int ret = 0; @@ -294,7 +294,7 @@ static int nvme_nvm_get_l2p_tbl(struct request_queue *q, u64 slba, u32 nlb, return -ENOMEM; while (nlb) { - u32 cmd_nlb = min_t(u32, nlb_pr_rq, nlb); + u32 cmd_nlb = min(nlb_pr_rq, nlb); c.l2p.slba = cpu_to_le64(cmd_slba); c.l2p.nlb = cpu_to_le32(cmd_nlb); -- cgit v1.2.3