- 根目录:
- drivers
- lightnvm
- core.c
/*
* Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
* Initial release: Matias Bjorling <m@bjorling.me>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
*/
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/sem.h>
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/lightnvm.h>
#include <uapi/linux/lightnvm.h>
static LIST_HEAD(nvm_targets);
static LIST_HEAD(nvm_mgrs);
static LIST_HEAD(nvm_devices);
static DECLARE_RWSEM(nvm_lock);
static struct nvm_tgt_type *nvm_find_target_type(const char *name)
{
struct nvm_tgt_type *tt;
list_for_each_entry(tt, &nvm_targets, list)
if (!strcmp(name, tt->name))
return tt;
return NULL;
}
int nvm_register_target(struct nvm_tgt_type *tt)
{
int ret = 0;
down_write(&nvm_lock);
if (nvm_find_target_type(tt->name))
ret = -EEXIST;
else
list_add(&tt->list, &nvm_targets);
up_write(&nvm_lock);
return ret;
}
EXPORT_SYMBOL(nvm_register_target);
void nvm_unregister_target(struct nvm_tgt_type *tt)
{
if (!tt)
return;
down_write(&nvm_lock);
list_del(&tt->list);
up_write(&nvm_lock);
}
EXPORT_SYMBOL(nvm_unregister_target);
void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
dma_addr_t *dma_handler)
{
return dev->ops->dev_dma_alloc(dev, dev->ppalist_pool, mem_flags,
dma_handler);
}
EXPORT_SYMBOL(nvm_dev_dma_alloc);
void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list,
dma_addr_t dma_handler)
{
dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler);
}
EXPORT_SYMBOL(nvm_dev_dma_free);
static struct nvmm_type *nvm_find_mgr_type(const char *name)
{
struct nvmm_type *mt;
list_for_each_entry(mt, &nvm_mgrs, list)
if (!strcmp(name, mt->name))
return mt;
return NULL;
}
struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev)
{
struct nvmm_type *mt;
int ret;
lockdep_assert_held(&nvm_lock);
list_for_each_entry(mt, &nvm_mgrs, list) {
ret = mt->register_mgr(dev);
if (ret < 0) {
pr_err("nvm: media mgr failed to init (%d) on dev %s\n",
ret, dev->name);
return NULL; /* initialization failed */
} else if (ret > 0)
return mt;
}
return NULL;
}
int nvm_register_mgr(struct nvmm_type *mt)
{
struct nvm_dev *dev;
int ret = 0;
down_write(&nvm_lock);
if (nvm_find_mgr_type(mt->name)) {
ret = -EEXIST;
goto finish;
} else {
list_add(&mt->list, &nvm_mgrs);
}
/* try to register media mgr if any device have none configured */
list_for_each_entry(dev, &nvm_devices, devices) {
if (dev->mt)
continue;
dev->mt = nvm_init_mgr(dev);
}
finish:
up_write(&nvm_lock);
return ret;
}
EXPORT_SYMBOL(nvm_register_mgr);
void nvm_unregister_mgr(struct nvmm_type *mt)
{
if (!mt)
return;
down_write(&nvm_lock);
list_del(&mt->list);
up_write(&nvm_lock);
}
EXPORT_SYMBOL(nvm_unregister_mgr);
static struct nvm_dev *nvm_find_nvm_dev(const char *name)
{
struct nvm_dev *dev;
list_for_each_entry(dev, &nvm_devices, devices)
if (!strcmp(name, dev->name))
return dev;
return NULL;
}
struct nvm_block *nvm_get_blk(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 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;
memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
dev->plane_mode = NVM_PLANE_SINGLE;
dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
if (grp->mtype != 0) {
pr_err("nvm: memory type not supported\n");
return -EINVAL;
}
if (grp->fmtype != 0 && grp->fmtype != 1) {
pr_err("nvm: flash type not supported\n");
return -EINVAL;
}
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);
}
static int nvm_init(struct nvm_dev *dev)
{
int ret = -EINVAL;
if (!dev->q || !dev->ops)
return ret;
if (dev->ops->identity(dev, &dev->identity)) {
pr_err("nvm: device could not be identified\n");
goto err;
}
pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
dev->identity.ver_id, dev->identity.vmnt,
dev->identity.cgrps);
if (dev->identity.ver_id != 1) {
pr_err("nvm: device not supported by kernel.");
goto err;
}
if (dev->identity.cgrps != 1) {
pr_err("nvm: only one group configuration supported.");
goto err;
}
ret = nvm_core_init(dev);
if (ret) {
pr_err("nvm: could not initialize core structures.\n");
goto err;
}
pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
dev->name, dev->sec_per_pg, dev->nr_planes,
dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
dev->nr_chnls);
return 0;
err:
pr_err("nvm: failed to initialize nvm\n");
return ret;
}
static void nvm_exit(struct nvm_dev *dev)
{
if (dev->ppalist_pool)
dev->ops->destroy_dma_pool(dev->ppalist_pool);
nvm_free(dev);
pr_info("nvm: successfully unloaded\n");
}
int nvm_register(struct request_queue *q, char *disk_name,
struct nvm_dev_ops *ops)
{
struct nvm_dev *dev;
int ret;
if (!ops->identity)
return -EINVAL;
dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->q = q;
dev->ops = ops;
strncpy(dev->name, disk_name, DISK_NAME_LEN);
ret = nvm_init(dev);
if (ret)
goto err_init;
if (dev->ops->max_phys_sect > 256) {
pr_info("nvm: max sectors supported is 256.\n");
ret = -EINVAL;
goto err_init;
}
if (dev->ops->max_phys_sect > 1) {
dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist");
if (!dev->ppalist_pool) {
pr_err("nvm: could not create ppa pool\n");
ret = -ENOMEM;
goto err_init;
}
}
/* register device with a supported media manager */
down_write(&nvm_lock);
dev->mt = nvm_init_mgr(dev);
list_add(&dev->devices, &nvm_devices);
up_write(&nvm_lock);
return 0;
err_init:
kfree(dev);
return ret;
}
EXPORT_SYMBOL(nvm_register);
void nvm_unregister(char *disk_name)
{
struct nvm_dev *dev;
down_write(&nvm_lock);
dev = nvm_find_nvm_dev(disk_name);
if (!dev) {
pr_err("nvm: could not find device %s to unregister\n",
disk_name);
up_write(&nvm_lock);
return;
}
list_del(&dev->devices);
up_write(&nvm_lock);
nvm_exit(dev);
kfree(dev);
}
EXPORT_SYMBOL(nvm_unregister);
static const struct block_device_operations nvm_fops = {
.owner = THIS_MODULE,
};
static int nvm_create_target(struct nvm_dev *dev,
struct nvm_ioctl_create *create)
{
struct nvm_ioctl_create_simple *s = &create->conf.s;
struct request_queue *tqueue;
struct gendisk *tdisk;
struct nvm_tgt_type *tt;
struct nvm_target *t;
void *targetdata;
if (!dev->mt) {
pr_info("nvm: device has no media manager registered.\n");
return -ENODEV;
}
down_write(&nvm_lock);
tt = nvm_find_target_type(create->tgttype);
if (!tt) {
pr_err("nvm: target type %s not found\n", create->tgttype);
up_write(&nvm_lock);
return -EINVAL;
}
list_for_each_entry(t, &dev->online_targets, list) {
if (!strcmp(create->tgtname, t->disk->disk_name)) {
pr_err("nvm: target name already exists.\n");
up_write(&nvm_lock);
return -EINVAL;
}
}
up_write(&nvm_lock);
t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
if (!t)
return -ENOMEM;
tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
if (!tqueue)
goto err_t;
blk_queue_make_request(tqueue, tt->make_rq);
tdisk = alloc_disk(0);
if (!tdisk)
goto err_queue;
sprintf(tdisk->disk_name, "%s", create->tgtname);
tdisk->flags = GENHD_FL_EXT_DEVT;
tdisk->major = 0;
tdisk->first_minor = 0;
tdisk->fops = &nvm_fops;
tdisk->queue = tqueue;
targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
if (IS_ERR(targetdata))
goto err_init;
tdisk->private_data = targetdata;
tqueue->queuedata = targetdata;
blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
set_capacity(tdisk, tt->capacity(targetdata));
add_disk(tdisk);
t->type = tt;
t->disk = tdisk;
down_write(&nvm_lock);
list_add_tail(&t->list, &dev->online_targets);
up_write(&nvm_lock);
return 0;
err_init:
put_disk(tdisk);
err_queue:
blk_cleanup_queue(tqueue);
err_t:
kfree(t);
return -ENOMEM;
}
static void nvm_remove_target(struct nvm_target *t)
{
struct nvm_tgt_type *tt = t->type;
struct gendisk *tdisk = t->disk;
struct request_queue *q = tdisk->queue;
lockdep_assert_held(&nvm_lock);
del_gendisk(tdisk);
blk_cleanup_queue(q);
if (tt->exit)
tt->exit(tdisk->private_data);
put_disk(tdisk);
list_del(&t->list);
kfree(t);
}
static int __nvm_configure_create(struct nvm_ioctl_create *create)
{
struct nvm_dev *dev;
struct nvm_ioctl_create_simple *s;
down_write(&nvm_lock);
dev = nvm_find_nvm_dev(create->dev);
up_write(&nvm_lock);
if (!dev) {
pr_err("nvm: device not found\n");
return -EINVAL;
}
if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
pr_err("nvm: config type not valid\n");
return -EINVAL;
}
s = &create->conf.s;
if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
pr_err("nvm: lun out of bound (%u:%u > %u)\n",
s->lun_begin, s->lun_end, dev->nr_luns);
return -EINVAL;
}
return nvm_create_target(dev, create);
}
static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
{
struct nvm_target *t = NULL;
struct nvm_dev *dev;
int ret = -1;
down_write(&nvm_lock);
list_for_each_entry(dev, &nvm_devices, devices)
list_for_each_entry(t, &dev->online_targets, list) {
if (!strcmp(remove->tgtname, t->disk->disk_name)) {
nvm_remove_target(t);
ret = 0;
break;
}
}
up_write(&nvm_lock);
if (ret) {
pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname);
return -EINVAL;
}
return 0;
}
#ifdef CONFIG_NVM_DEBUG
static int nvm_configure_show(const char *val)
{
struct nvm_dev *dev;
char opcode, devname[DISK_NAME_LEN];
int ret;
ret = sscanf(val, "%c %32s", &opcode, devname);
if (ret != 2) {
pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
return -EINVAL;
}
down_write(&nvm_lock);
dev = nvm_find_nvm_dev(devname);
up_write(&nvm_lock);
if (!dev) {
pr_err("nvm: device not found\n");
return -EINVAL;
}
if (!dev->mt)
return 0;
dev->mt->lun_info_print(dev);
return 0;
}
static int nvm_configure_remove(const char *val)
{
struct nvm_ioctl_remove remove;
char opcode;
int ret;
ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
if (ret != 2) {
pr_err("nvm: invalid command. Use \"d targetname\".\n");
return -EINVAL;
}
remove.flags = 0;
return __nvm_configure_remove(&remove);
}
static int nvm_configure_create(const char *val)
{
struct nvm_ioctl_create create;
char opcode;
int lun_begin, lun_end, ret;
ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
create.tgtname, create.tgttype,
&lun_begin, &lun_end);
if (ret != 6) {
pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
return -EINVAL;
}
create.flags = 0;
create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
create.conf.s.lun_begin = lun_begin;
create.conf.s.lun_end = lun_end;
return __nvm_configure_create(&create);
}
/* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
static int nvm_configure_by_str_event(const char *val,
const struct kernel_param *kp)
{
char opcode;
int ret;
ret = sscanf(val, "%c", &opcode);
if (ret != 1) {
pr_err("nvm: string must have the format of \"cmd ...\"\n");
return -EINVAL;
}
switch (opcode) {
case 'a':
return nvm_configure_create(val);
case 'd':
return nvm_configure_remove(val);
case 's':
return nvm_configure_show(val);
default:
pr_err("nvm: invalid command\n");
return -EINVAL;
}
return 0;
}
static int nvm_configure_get(char *buf, const struct kernel_param *kp)
{
int sz = 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))) {
kfree(info);
return -EFAULT;
}
kfree(info);
return 0;
}
static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
{
struct nvm_ioctl_get_devices *devices;
struct nvm_dev *dev;
int i = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
if (!devices)
return -ENOMEM;
down_write(&nvm_lock);
list_for_each_entry(dev, &nvm_devices, devices) {
struct nvm_ioctl_device_info *info = &devices->info[i];
sprintf(info->devname, "%s", dev->name);
if (dev->mt) {
info->bmversion[0] = dev->mt->version[0];
info->bmversion[1] = dev->mt->version[1];
info->bmversion[2] = dev->mt->version[2];
sprintf(info->bmname, "%s", dev->mt->name);
} else {
sprintf(info->bmname, "none");
}
i++;
if (i > 31) {
pr_err("nvm: max 31 devices can be reported.\n");
break;
}
}
up_write(&nvm_lock);
devices->nr_devices = i;
if (copy_to_user(arg, devices,
sizeof(struct nvm_ioctl_get_devices))) {
kfree(devices);
return -EFAULT;
}
kfree(devices);
return 0;
}
static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
{
struct nvm_ioctl_create create;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
return -EFAULT;
create.dev[DISK_NAME_LEN - 1] = '\0';
create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
create.tgtname[DISK_NAME_LEN - 1] = '\0';
if (create.flags != 0) {
pr_err("nvm: no flags supported\n");
return -EINVAL;
}
return __nvm_configure_create(&create);
}
static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
{
struct nvm_ioctl_remove remove;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
return -EFAULT;
remove.tgtname[DISK_NAME_LEN - 1] = '\0';
if (remove.flags != 0) {
pr_err("nvm: no flags supported\n");
return -EINVAL;
}
return __nvm_configure_remove(&remove);
}
static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
switch (cmd) {
case NVM_INFO:
return nvm_ioctl_info(file, argp);
case NVM_GET_DEVICES:
return nvm_ioctl_get_devices(file, argp);
case NVM_DEV_CREATE:
return nvm_ioctl_dev_create(file, argp);
case NVM_DEV_REMOVE:
return nvm_ioctl_dev_remove(file, argp);
}
return 0;
}
static const struct file_operations _ctl_fops = {
.open = nonseekable_open,
.unlocked_ioctl = nvm_ctl_ioctl,
.owner = THIS_MODULE,
.llseek = noop_llseek,
};
static struct miscdevice _nvm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "lightnvm",
.nodename = "lightnvm/control",
.fops = &_ctl_fops,
};
MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
static int __init nvm_mod_init(void)
{
int ret;
ret = misc_register(&_nvm_misc);
if (ret)
pr_err("nvm: misc_register failed for control device");
return ret;
}
static void __exit nvm_mod_exit(void)
{
misc_deregister(&_nvm_misc);
}
MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.1");
module_init(nvm_mod_init);
module_exit(nvm_mod_exit);