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1452 lines
31 KiB
1452 lines
31 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2015 IT University of Copenhagen. All rights reserved. |
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* Initial release: Matias Bjorling <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) "nvm: " fmt |
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|
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#include <linux/list.h> |
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#include <linux/types.h> |
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#include <linux/sem.h> |
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#include <linux/bitmap.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/miscdevice.h> |
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#include <linux/lightnvm.h> |
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#include <linux/sched/sysctl.h> |
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|
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static LIST_HEAD(nvm_tgt_types); |
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static DECLARE_RWSEM(nvm_tgtt_lock); |
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static LIST_HEAD(nvm_devices); |
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static DECLARE_RWSEM(nvm_lock); |
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|
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/* Map between virtual and physical channel and lun */ |
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struct nvm_ch_map { |
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int ch_off; |
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int num_lun; |
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int *lun_offs; |
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}; |
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|
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struct nvm_dev_map { |
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struct nvm_ch_map *chnls; |
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int num_ch; |
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}; |
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|
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static void nvm_free(struct kref *ref); |
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|
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static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name) |
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{ |
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struct nvm_target *tgt; |
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|
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list_for_each_entry(tgt, &dev->targets, list) |
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if (!strcmp(name, tgt->disk->disk_name)) |
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return tgt; |
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|
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return NULL; |
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} |
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|
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static bool nvm_target_exists(const char *name) |
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{ |
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struct nvm_dev *dev; |
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struct nvm_target *tgt; |
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bool ret = false; |
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|
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down_write(&nvm_lock); |
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list_for_each_entry(dev, &nvm_devices, devices) { |
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mutex_lock(&dev->mlock); |
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list_for_each_entry(tgt, &dev->targets, list) { |
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if (!strcmp(name, tgt->disk->disk_name)) { |
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ret = true; |
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mutex_unlock(&dev->mlock); |
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goto out; |
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} |
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} |
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mutex_unlock(&dev->mlock); |
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} |
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|
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out: |
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up_write(&nvm_lock); |
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return ret; |
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} |
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|
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static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end) |
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{ |
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int i; |
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|
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for (i = lun_begin; i <= lun_end; i++) { |
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if (test_and_set_bit(i, dev->lun_map)) { |
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pr_err("lun %d already allocated\n", i); |
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goto err; |
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} |
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} |
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|
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return 0; |
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err: |
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while (--i >= lun_begin) |
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clear_bit(i, dev->lun_map); |
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|
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return -EBUSY; |
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} |
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|
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static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin, |
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int lun_end) |
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{ |
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int i; |
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|
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for (i = lun_begin; i <= lun_end; i++) |
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WARN_ON(!test_and_clear_bit(i, dev->lun_map)); |
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} |
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|
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static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear) |
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{ |
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struct nvm_dev *dev = tgt_dev->parent; |
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struct nvm_dev_map *dev_map = tgt_dev->map; |
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int i, j; |
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|
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for (i = 0; i < dev_map->num_ch; i++) { |
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struct nvm_ch_map *ch_map = &dev_map->chnls[i]; |
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int *lun_offs = ch_map->lun_offs; |
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int ch = i + ch_map->ch_off; |
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|
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if (clear) { |
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for (j = 0; j < ch_map->num_lun; j++) { |
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int lun = j + lun_offs[j]; |
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int lunid = (ch * dev->geo.num_lun) + lun; |
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|
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WARN_ON(!test_and_clear_bit(lunid, |
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dev->lun_map)); |
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} |
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} |
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|
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kfree(ch_map->lun_offs); |
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} |
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|
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kfree(dev_map->chnls); |
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kfree(dev_map); |
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|
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kfree(tgt_dev->luns); |
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kfree(tgt_dev); |
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} |
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|
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static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev, |
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u16 lun_begin, u16 lun_end, |
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u16 op) |
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{ |
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struct nvm_tgt_dev *tgt_dev = NULL; |
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struct nvm_dev_map *dev_rmap = dev->rmap; |
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struct nvm_dev_map *dev_map; |
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struct ppa_addr *luns; |
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int num_lun = lun_end - lun_begin + 1; |
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int luns_left = num_lun; |
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int num_ch = num_lun / dev->geo.num_lun; |
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int num_ch_mod = num_lun % dev->geo.num_lun; |
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int bch = lun_begin / dev->geo.num_lun; |
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int blun = lun_begin % dev->geo.num_lun; |
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int lunid = 0; |
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int lun_balanced = 1; |
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int sec_per_lun, prev_num_lun; |
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int i, j; |
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num_ch = (num_ch_mod == 0) ? num_ch : num_ch + 1; |
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dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL); |
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if (!dev_map) |
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goto err_dev; |
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|
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dev_map->chnls = kcalloc(num_ch, sizeof(struct nvm_ch_map), GFP_KERNEL); |
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if (!dev_map->chnls) |
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goto err_chnls; |
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luns = kcalloc(num_lun, sizeof(struct ppa_addr), GFP_KERNEL); |
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if (!luns) |
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goto err_luns; |
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prev_num_lun = (luns_left > dev->geo.num_lun) ? |
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dev->geo.num_lun : luns_left; |
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for (i = 0; i < num_ch; i++) { |
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struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch]; |
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int *lun_roffs = ch_rmap->lun_offs; |
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struct nvm_ch_map *ch_map = &dev_map->chnls[i]; |
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int *lun_offs; |
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int luns_in_chnl = (luns_left > dev->geo.num_lun) ? |
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dev->geo.num_lun : luns_left; |
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|
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if (lun_balanced && prev_num_lun != luns_in_chnl) |
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lun_balanced = 0; |
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ch_map->ch_off = ch_rmap->ch_off = bch; |
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ch_map->num_lun = luns_in_chnl; |
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lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); |
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if (!lun_offs) |
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goto err_ch; |
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for (j = 0; j < luns_in_chnl; j++) { |
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luns[lunid].ppa = 0; |
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luns[lunid].a.ch = i; |
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luns[lunid++].a.lun = j; |
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|
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lun_offs[j] = blun; |
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lun_roffs[j + blun] = blun; |
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} |
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ch_map->lun_offs = lun_offs; |
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|
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/* when starting a new channel, lun offset is reset */ |
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blun = 0; |
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luns_left -= luns_in_chnl; |
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} |
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dev_map->num_ch = num_ch; |
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tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL); |
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if (!tgt_dev) |
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goto err_ch; |
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|
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/* Inherit device geometry from parent */ |
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memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo)); |
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|
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/* Target device only owns a portion of the physical device */ |
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tgt_dev->geo.num_ch = num_ch; |
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tgt_dev->geo.num_lun = (lun_balanced) ? prev_num_lun : -1; |
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tgt_dev->geo.all_luns = num_lun; |
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tgt_dev->geo.all_chunks = num_lun * dev->geo.num_chk; |
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tgt_dev->geo.op = op; |
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sec_per_lun = dev->geo.clba * dev->geo.num_chk; |
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tgt_dev->geo.total_secs = num_lun * sec_per_lun; |
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tgt_dev->q = dev->q; |
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tgt_dev->map = dev_map; |
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tgt_dev->luns = luns; |
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tgt_dev->parent = dev; |
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|
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return tgt_dev; |
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err_ch: |
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while (--i >= 0) |
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kfree(dev_map->chnls[i].lun_offs); |
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kfree(luns); |
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err_luns: |
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kfree(dev_map->chnls); |
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err_chnls: |
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kfree(dev_map); |
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err_dev: |
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return tgt_dev; |
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} |
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static struct nvm_tgt_type *__nvm_find_target_type(const char *name) |
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{ |
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struct nvm_tgt_type *tt; |
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|
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list_for_each_entry(tt, &nvm_tgt_types, list) |
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if (!strcmp(name, tt->name)) |
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return tt; |
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return NULL; |
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} |
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static struct nvm_tgt_type *nvm_find_target_type(const char *name) |
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{ |
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struct nvm_tgt_type *tt; |
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down_write(&nvm_tgtt_lock); |
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tt = __nvm_find_target_type(name); |
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up_write(&nvm_tgtt_lock); |
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return tt; |
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} |
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static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin, |
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int lun_end) |
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{ |
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if (lun_begin > lun_end || lun_end >= geo->all_luns) { |
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pr_err("lun out of bound (%u:%u > %u)\n", |
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lun_begin, lun_end, geo->all_luns - 1); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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|
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static int __nvm_config_simple(struct nvm_dev *dev, |
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struct nvm_ioctl_create_simple *s) |
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{ |
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struct nvm_geo *geo = &dev->geo; |
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|
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if (s->lun_begin == -1 && s->lun_end == -1) { |
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s->lun_begin = 0; |
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s->lun_end = geo->all_luns - 1; |
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} |
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return nvm_config_check_luns(geo, s->lun_begin, s->lun_end); |
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} |
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static int __nvm_config_extended(struct nvm_dev *dev, |
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struct nvm_ioctl_create_extended *e) |
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{ |
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if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) { |
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e->lun_begin = 0; |
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e->lun_end = dev->geo.all_luns - 1; |
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} |
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|
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/* op not set falls into target's default */ |
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if (e->op == 0xFFFF) { |
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e->op = NVM_TARGET_DEFAULT_OP; |
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} else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) { |
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pr_err("invalid over provisioning value\n"); |
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return -EINVAL; |
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} |
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|
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return nvm_config_check_luns(&dev->geo, e->lun_begin, e->lun_end); |
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} |
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static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) |
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{ |
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struct nvm_ioctl_create_extended e; |
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struct request_queue *tqueue; |
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struct gendisk *tdisk; |
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struct nvm_tgt_type *tt; |
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struct nvm_target *t; |
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struct nvm_tgt_dev *tgt_dev; |
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void *targetdata; |
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unsigned int mdts; |
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int ret; |
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|
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switch (create->conf.type) { |
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case NVM_CONFIG_TYPE_SIMPLE: |
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ret = __nvm_config_simple(dev, &create->conf.s); |
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if (ret) |
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return ret; |
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e.lun_begin = create->conf.s.lun_begin; |
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e.lun_end = create->conf.s.lun_end; |
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e.op = NVM_TARGET_DEFAULT_OP; |
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break; |
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case NVM_CONFIG_TYPE_EXTENDED: |
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ret = __nvm_config_extended(dev, &create->conf.e); |
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if (ret) |
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return ret; |
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|
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e = create->conf.e; |
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break; |
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default: |
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pr_err("config type not valid\n"); |
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return -EINVAL; |
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} |
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|
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tt = nvm_find_target_type(create->tgttype); |
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if (!tt) { |
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pr_err("target type %s not found\n", create->tgttype); |
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return -EINVAL; |
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} |
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|
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if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) { |
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pr_err("device is incompatible with target L2P type.\n"); |
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return -EINVAL; |
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} |
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|
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if (nvm_target_exists(create->tgtname)) { |
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pr_err("target name already exists (%s)\n", |
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create->tgtname); |
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return -EINVAL; |
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} |
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|
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ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end); |
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if (ret) |
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return ret; |
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|
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t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); |
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if (!t) { |
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ret = -ENOMEM; |
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goto err_reserve; |
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} |
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tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op); |
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if (!tgt_dev) { |
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pr_err("could not create target device\n"); |
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ret = -ENOMEM; |
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goto err_t; |
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} |
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|
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tdisk = alloc_disk(0); |
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if (!tdisk) { |
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ret = -ENOMEM; |
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goto err_dev; |
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} |
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|
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tqueue = blk_alloc_queue(dev->q->node); |
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if (!tqueue) { |
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ret = -ENOMEM; |
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goto err_disk; |
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} |
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|
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strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name)); |
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tdisk->flags = GENHD_FL_EXT_DEVT; |
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tdisk->major = 0; |
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tdisk->first_minor = 0; |
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tdisk->fops = tt->bops; |
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tdisk->queue = tqueue; |
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|
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targetdata = tt->init(tgt_dev, tdisk, create->flags); |
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if (IS_ERR(targetdata)) { |
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ret = PTR_ERR(targetdata); |
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goto err_init; |
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} |
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tdisk->private_data = targetdata; |
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tqueue->queuedata = targetdata; |
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|
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mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA; |
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if (dev->geo.mdts) { |
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mdts = min_t(u32, dev->geo.mdts, |
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(dev->geo.csecs >> 9) * NVM_MAX_VLBA); |
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} |
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blk_queue_max_hw_sectors(tqueue, mdts); |
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|
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set_capacity(tdisk, tt->capacity(targetdata)); |
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add_disk(tdisk); |
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|
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if (tt->sysfs_init && tt->sysfs_init(tdisk)) { |
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ret = -ENOMEM; |
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goto err_sysfs; |
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} |
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|
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t->type = tt; |
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t->disk = tdisk; |
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t->dev = tgt_dev; |
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|
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mutex_lock(&dev->mlock); |
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list_add_tail(&t->list, &dev->targets); |
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mutex_unlock(&dev->mlock); |
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|
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__module_get(tt->owner); |
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|
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return 0; |
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err_sysfs: |
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if (tt->exit) |
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tt->exit(targetdata, true); |
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err_init: |
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blk_cleanup_queue(tqueue); |
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tdisk->queue = NULL; |
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err_disk: |
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put_disk(tdisk); |
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err_dev: |
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nvm_remove_tgt_dev(tgt_dev, 0); |
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err_t: |
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kfree(t); |
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err_reserve: |
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nvm_release_luns_err(dev, e.lun_begin, e.lun_end); |
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return ret; |
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} |
|
|
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static void __nvm_remove_target(struct nvm_target *t, bool graceful) |
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{ |
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struct nvm_tgt_type *tt = t->type; |
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struct gendisk *tdisk = t->disk; |
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struct request_queue *q = tdisk->queue; |
|
|
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del_gendisk(tdisk); |
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blk_cleanup_queue(q); |
|
|
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if (tt->sysfs_exit) |
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tt->sysfs_exit(tdisk); |
|
|
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if (tt->exit) |
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tt->exit(tdisk->private_data, graceful); |
|
|
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nvm_remove_tgt_dev(t->dev, 1); |
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put_disk(tdisk); |
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module_put(t->type->owner); |
|
|
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list_del(&t->list); |
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kfree(t); |
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} |
|
|
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/** |
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* nvm_remove_tgt - Removes a target from the media manager |
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* @remove: ioctl structure with target name to remove. |
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* |
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* Returns: |
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* 0: on success |
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* 1: on not found |
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* <0: on error |
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*/ |
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static int nvm_remove_tgt(struct nvm_ioctl_remove *remove) |
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{ |
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struct nvm_target *t = NULL; |
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struct nvm_dev *dev; |
|
|
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down_read(&nvm_lock); |
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list_for_each_entry(dev, &nvm_devices, devices) { |
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mutex_lock(&dev->mlock); |
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t = nvm_find_target(dev, remove->tgtname); |
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if (t) { |
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mutex_unlock(&dev->mlock); |
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break; |
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} |
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mutex_unlock(&dev->mlock); |
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} |
|
up_read(&nvm_lock); |
|
|
|
if (!t) { |
|
pr_err("failed to remove target %s\n", |
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remove->tgtname); |
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return 1; |
|
} |
|
|
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__nvm_remove_target(t, true); |
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kref_put(&dev->ref, nvm_free); |
|
|
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return 0; |
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} |
|
|
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static int nvm_register_map(struct nvm_dev *dev) |
|
{ |
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struct nvm_dev_map *rmap; |
|
int i, j; |
|
|
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rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL); |
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if (!rmap) |
|
goto err_rmap; |
|
|
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rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map), |
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GFP_KERNEL); |
|
if (!rmap->chnls) |
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goto err_chnls; |
|
|
|
for (i = 0; i < dev->geo.num_ch; i++) { |
|
struct nvm_ch_map *ch_rmap; |
|
int *lun_roffs; |
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int luns_in_chnl = dev->geo.num_lun; |
|
|
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ch_rmap = &rmap->chnls[i]; |
|
|
|
ch_rmap->ch_off = -1; |
|
ch_rmap->num_lun = luns_in_chnl; |
|
|
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lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); |
|
if (!lun_roffs) |
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goto err_ch; |
|
|
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for (j = 0; j < luns_in_chnl; j++) |
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lun_roffs[j] = -1; |
|
|
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ch_rmap->lun_offs = lun_roffs; |
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} |
|
|
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dev->rmap = rmap; |
|
|
|
return 0; |
|
err_ch: |
|
while (--i >= 0) |
|
kfree(rmap->chnls[i].lun_offs); |
|
err_chnls: |
|
kfree(rmap); |
|
err_rmap: |
|
return -ENOMEM; |
|
} |
|
|
|
static void nvm_unregister_map(struct nvm_dev *dev) |
|
{ |
|
struct nvm_dev_map *rmap = dev->rmap; |
|
int i; |
|
|
|
for (i = 0; i < dev->geo.num_ch; i++) |
|
kfree(rmap->chnls[i].lun_offs); |
|
|
|
kfree(rmap->chnls); |
|
kfree(rmap); |
|
} |
|
|
|
static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) |
|
{ |
|
struct nvm_dev_map *dev_map = tgt_dev->map; |
|
struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch]; |
|
int lun_off = ch_map->lun_offs[p->a.lun]; |
|
|
|
p->a.ch += ch_map->ch_off; |
|
p->a.lun += lun_off; |
|
} |
|
|
|
static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) |
|
{ |
|
struct nvm_dev *dev = tgt_dev->parent; |
|
struct nvm_dev_map *dev_rmap = dev->rmap; |
|
struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch]; |
|
int lun_roff = ch_rmap->lun_offs[p->a.lun]; |
|
|
|
p->a.ch -= ch_rmap->ch_off; |
|
p->a.lun -= lun_roff; |
|
} |
|
|
|
static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, |
|
struct ppa_addr *ppa_list, int nr_ppas) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < nr_ppas; i++) { |
|
nvm_map_to_dev(tgt_dev, &ppa_list[i]); |
|
ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]); |
|
} |
|
} |
|
|
|
static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, |
|
struct ppa_addr *ppa_list, int nr_ppas) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < nr_ppas; i++) { |
|
ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]); |
|
nvm_map_to_tgt(tgt_dev, &ppa_list[i]); |
|
} |
|
} |
|
|
|
static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) |
|
{ |
|
struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
|
|
|
nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas); |
|
} |
|
|
|
static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) |
|
{ |
|
struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
|
|
|
nvm_ppa_dev_to_tgt(tgt_dev, ppa_list, rqd->nr_ppas); |
|
} |
|
|
|
int nvm_register_tgt_type(struct nvm_tgt_type *tt) |
|
{ |
|
int ret = 0; |
|
|
|
down_write(&nvm_tgtt_lock); |
|
if (__nvm_find_target_type(tt->name)) |
|
ret = -EEXIST; |
|
else |
|
list_add(&tt->list, &nvm_tgt_types); |
|
up_write(&nvm_tgtt_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(nvm_register_tgt_type); |
|
|
|
void nvm_unregister_tgt_type(struct nvm_tgt_type *tt) |
|
{ |
|
if (!tt) |
|
return; |
|
|
|
down_write(&nvm_tgtt_lock); |
|
list_del(&tt->list); |
|
up_write(&nvm_tgtt_lock); |
|
} |
|
EXPORT_SYMBOL(nvm_unregister_tgt_type); |
|
|
|
void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags, |
|
dma_addr_t *dma_handler) |
|
{ |
|
return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags, |
|
dma_handler); |
|
} |
|
EXPORT_SYMBOL(nvm_dev_dma_alloc); |
|
|
|
void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler) |
|
{ |
|
dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler); |
|
} |
|
EXPORT_SYMBOL(nvm_dev_dma_free); |
|
|
|
static struct nvm_dev *nvm_find_nvm_dev(const char *name) |
|
{ |
|
struct nvm_dev *dev; |
|
|
|
list_for_each_entry(dev, &nvm_devices, devices) |
|
if (!strcmp(name, dev->name)) |
|
return dev; |
|
|
|
return NULL; |
|
} |
|
|
|
static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, |
|
const struct ppa_addr *ppas, int nr_ppas) |
|
{ |
|
struct nvm_dev *dev = tgt_dev->parent; |
|
struct nvm_geo *geo = &tgt_dev->geo; |
|
int i, plane_cnt, pl_idx; |
|
struct ppa_addr ppa; |
|
|
|
if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) { |
|
rqd->nr_ppas = nr_ppas; |
|
rqd->ppa_addr = ppas[0]; |
|
|
|
return 0; |
|
} |
|
|
|
rqd->nr_ppas = nr_ppas; |
|
rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); |
|
if (!rqd->ppa_list) { |
|
pr_err("failed to allocate dma memory\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
plane_cnt = geo->pln_mode; |
|
rqd->nr_ppas *= plane_cnt; |
|
|
|
for (i = 0; i < nr_ppas; i++) { |
|
for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { |
|
ppa = ppas[i]; |
|
ppa.g.pl = pl_idx; |
|
rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, |
|
struct nvm_rq *rqd) |
|
{ |
|
if (!rqd->ppa_list) |
|
return; |
|
|
|
nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list); |
|
} |
|
|
|
static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd) |
|
{ |
|
int flags = 0; |
|
|
|
if (geo->version == NVM_OCSSD_SPEC_20) |
|
return 0; |
|
|
|
if (rqd->is_seq) |
|
flags |= geo->pln_mode >> 1; |
|
|
|
if (rqd->opcode == NVM_OP_PREAD) |
|
flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND); |
|
else if (rqd->opcode == NVM_OP_PWRITE) |
|
flags |= NVM_IO_SCRAMBLE_ENABLE; |
|
|
|
return flags; |
|
} |
|
|
|
int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf) |
|
{ |
|
struct nvm_dev *dev = tgt_dev->parent; |
|
int ret; |
|
|
|
if (!dev->ops->submit_io) |
|
return -ENODEV; |
|
|
|
nvm_rq_tgt_to_dev(tgt_dev, rqd); |
|
|
|
rqd->dev = tgt_dev; |
|
rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd); |
|
|
|
/* In case of error, fail with right address format */ |
|
ret = dev->ops->submit_io(dev, rqd, buf); |
|
if (ret) |
|
nvm_rq_dev_to_tgt(tgt_dev, rqd); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(nvm_submit_io); |
|
|
|
static void nvm_sync_end_io(struct nvm_rq *rqd) |
|
{ |
|
struct completion *waiting = rqd->private; |
|
|
|
complete(waiting); |
|
} |
|
|
|
static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd, |
|
void *buf) |
|
{ |
|
DECLARE_COMPLETION_ONSTACK(wait); |
|
int ret = 0; |
|
|
|
rqd->end_io = nvm_sync_end_io; |
|
rqd->private = &wait; |
|
|
|
ret = dev->ops->submit_io(dev, rqd, buf); |
|
if (ret) |
|
return ret; |
|
|
|
wait_for_completion_io(&wait); |
|
|
|
return 0; |
|
} |
|
|
|
int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, |
|
void *buf) |
|
{ |
|
struct nvm_dev *dev = tgt_dev->parent; |
|
int ret; |
|
|
|
if (!dev->ops->submit_io) |
|
return -ENODEV; |
|
|
|
nvm_rq_tgt_to_dev(tgt_dev, rqd); |
|
|
|
rqd->dev = tgt_dev; |
|
rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd); |
|
|
|
ret = nvm_submit_io_wait(dev, rqd, buf); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(nvm_submit_io_sync); |
|
|
|
void nvm_end_io(struct nvm_rq *rqd) |
|
{ |
|
struct nvm_tgt_dev *tgt_dev = rqd->dev; |
|
|
|
/* Convert address space */ |
|
if (tgt_dev) |
|
nvm_rq_dev_to_tgt(tgt_dev, rqd); |
|
|
|
if (rqd->end_io) |
|
rqd->end_io(rqd); |
|
} |
|
EXPORT_SYMBOL(nvm_end_io); |
|
|
|
static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd) |
|
{ |
|
if (!dev->ops->submit_io) |
|
return -ENODEV; |
|
|
|
rqd->dev = NULL; |
|
rqd->flags = nvm_set_flags(&dev->geo, rqd); |
|
|
|
return nvm_submit_io_wait(dev, rqd, NULL); |
|
} |
|
|
|
static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa) |
|
{ |
|
struct nvm_rq rqd = { NULL }; |
|
struct bio bio; |
|
struct bio_vec bio_vec; |
|
struct page *page; |
|
int ret; |
|
|
|
page = alloc_page(GFP_KERNEL); |
|
if (!page) |
|
return -ENOMEM; |
|
|
|
bio_init(&bio, &bio_vec, 1); |
|
bio_add_page(&bio, page, PAGE_SIZE, 0); |
|
bio_set_op_attrs(&bio, REQ_OP_READ, 0); |
|
|
|
rqd.bio = &bio; |
|
rqd.opcode = NVM_OP_PREAD; |
|
rqd.is_seq = 1; |
|
rqd.nr_ppas = 1; |
|
rqd.ppa_addr = generic_to_dev_addr(dev, ppa); |
|
|
|
ret = nvm_submit_io_sync_raw(dev, &rqd); |
|
__free_page(page); |
|
if (ret) |
|
return ret; |
|
|
|
return rqd.error; |
|
} |
|
|
|
/* |
|
* Scans a 1.2 chunk first and last page to determine if its state. |
|
* If the chunk is found to be open, also scan it to update the write |
|
* pointer. |
|
*/ |
|
static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa, |
|
struct nvm_chk_meta *meta) |
|
{ |
|
struct nvm_geo *geo = &dev->geo; |
|
int ret, pg, pl; |
|
|
|
/* sense first page */ |
|
ret = nvm_bb_chunk_sense(dev, ppa); |
|
if (ret < 0) /* io error */ |
|
return ret; |
|
else if (ret == 0) /* valid data */ |
|
meta->state = NVM_CHK_ST_OPEN; |
|
else if (ret > 0) { |
|
/* |
|
* If empty page, the chunk is free, else it is an |
|
* actual io error. In that case, mark it offline. |
|
*/ |
|
switch (ret) { |
|
case NVM_RSP_ERR_EMPTYPAGE: |
|
meta->state = NVM_CHK_ST_FREE; |
|
return 0; |
|
case NVM_RSP_ERR_FAILCRC: |
|
case NVM_RSP_ERR_FAILECC: |
|
case NVM_RSP_WARN_HIGHECC: |
|
meta->state = NVM_CHK_ST_OPEN; |
|
goto scan; |
|
default: |
|
return -ret; /* other io error */ |
|
} |
|
} |
|
|
|
/* sense last page */ |
|
ppa.g.pg = geo->num_pg - 1; |
|
ppa.g.pl = geo->num_pln - 1; |
|
|
|
ret = nvm_bb_chunk_sense(dev, ppa); |
|
if (ret < 0) /* io error */ |
|
return ret; |
|
else if (ret == 0) { /* Chunk fully written */ |
|
meta->state = NVM_CHK_ST_CLOSED; |
|
meta->wp = geo->clba; |
|
return 0; |
|
} else if (ret > 0) { |
|
switch (ret) { |
|
case NVM_RSP_ERR_EMPTYPAGE: |
|
case NVM_RSP_ERR_FAILCRC: |
|
case NVM_RSP_ERR_FAILECC: |
|
case NVM_RSP_WARN_HIGHECC: |
|
meta->state = NVM_CHK_ST_OPEN; |
|
break; |
|
default: |
|
return -ret; /* other io error */ |
|
} |
|
} |
|
|
|
scan: |
|
/* |
|
* chunk is open, we scan sequentially to update the write pointer. |
|
* We make the assumption that targets write data across all planes |
|
* before moving to the next page. |
|
*/ |
|
for (pg = 0; pg < geo->num_pg; pg++) { |
|
for (pl = 0; pl < geo->num_pln; pl++) { |
|
ppa.g.pg = pg; |
|
ppa.g.pl = pl; |
|
|
|
ret = nvm_bb_chunk_sense(dev, ppa); |
|
if (ret < 0) /* io error */ |
|
return ret; |
|
else if (ret == 0) { |
|
meta->wp += geo->ws_min; |
|
} else if (ret > 0) { |
|
switch (ret) { |
|
case NVM_RSP_ERR_EMPTYPAGE: |
|
return 0; |
|
case NVM_RSP_ERR_FAILCRC: |
|
case NVM_RSP_ERR_FAILECC: |
|
case NVM_RSP_WARN_HIGHECC: |
|
meta->wp += geo->ws_min; |
|
break; |
|
default: |
|
return -ret; /* other io error */ |
|
} |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* folds a bad block list from its plane representation to its |
|
* chunk representation. |
|
* |
|
* If any of the planes status are bad or grown bad, the chunk is marked |
|
* offline. If not bad, the first plane state acts as the chunk state. |
|
*/ |
|
static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa, |
|
u8 *blks, int nr_blks, struct nvm_chk_meta *meta) |
|
{ |
|
struct nvm_geo *geo = &dev->geo; |
|
int ret, blk, pl, offset, blktype; |
|
|
|
for (blk = 0; blk < geo->num_chk; blk++) { |
|
offset = blk * geo->pln_mode; |
|
blktype = blks[offset]; |
|
|
|
for (pl = 0; pl < geo->pln_mode; pl++) { |
|
if (blks[offset + pl] & |
|
(NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) { |
|
blktype = blks[offset + pl]; |
|
break; |
|
} |
|
} |
|
|
|
ppa.g.blk = blk; |
|
|
|
meta->wp = 0; |
|
meta->type = NVM_CHK_TP_W_SEQ; |
|
meta->wi = 0; |
|
meta->slba = generic_to_dev_addr(dev, ppa).ppa; |
|
meta->cnlb = dev->geo.clba; |
|
|
|
if (blktype == NVM_BLK_T_FREE) { |
|
ret = nvm_bb_chunk_scan(dev, ppa, meta); |
|
if (ret) |
|
return ret; |
|
} else { |
|
meta->state = NVM_CHK_ST_OFFLINE; |
|
} |
|
|
|
meta++; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba, |
|
int nchks, struct nvm_chk_meta *meta) |
|
{ |
|
struct nvm_geo *geo = &dev->geo; |
|
struct ppa_addr ppa; |
|
u8 *blks; |
|
int ch, lun, nr_blks; |
|
int ret = 0; |
|
|
|
ppa.ppa = slba; |
|
ppa = dev_to_generic_addr(dev, ppa); |
|
|
|
if (ppa.g.blk != 0) |
|
return -EINVAL; |
|
|
|
if ((nchks % geo->num_chk) != 0) |
|
return -EINVAL; |
|
|
|
nr_blks = geo->num_chk * geo->pln_mode; |
|
|
|
blks = kmalloc(nr_blks, GFP_KERNEL); |
|
if (!blks) |
|
return -ENOMEM; |
|
|
|
for (ch = ppa.g.ch; ch < geo->num_ch; ch++) { |
|
for (lun = ppa.g.lun; lun < geo->num_lun; lun++) { |
|
struct ppa_addr ppa_gen, ppa_dev; |
|
|
|
if (!nchks) |
|
goto done; |
|
|
|
ppa_gen.ppa = 0; |
|
ppa_gen.g.ch = ch; |
|
ppa_gen.g.lun = lun; |
|
ppa_dev = generic_to_dev_addr(dev, ppa_gen); |
|
|
|
ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks); |
|
if (ret) |
|
goto done; |
|
|
|
ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks, |
|
meta); |
|
if (ret) |
|
goto done; |
|
|
|
meta += geo->num_chk; |
|
nchks -= geo->num_chk; |
|
} |
|
} |
|
done: |
|
kfree(blks); |
|
return ret; |
|
} |
|
|
|
int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa, |
|
int nchks, struct nvm_chk_meta *meta) |
|
{ |
|
struct nvm_dev *dev = tgt_dev->parent; |
|
|
|
nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1); |
|
|
|
if (dev->geo.version == NVM_OCSSD_SPEC_12) |
|
return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta); |
|
|
|
return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta); |
|
} |
|
EXPORT_SYMBOL_GPL(nvm_get_chunk_meta); |
|
|
|
int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, |
|
int nr_ppas, int type) |
|
{ |
|
struct nvm_dev *dev = tgt_dev->parent; |
|
struct nvm_rq rqd; |
|
int ret; |
|
|
|
if (dev->geo.version == NVM_OCSSD_SPEC_20) |
|
return 0; |
|
|
|
if (nr_ppas > NVM_MAX_VLBA) { |
|
pr_err("unable to update all blocks atomically\n"); |
|
return -EINVAL; |
|
} |
|
|
|
memset(&rqd, 0, sizeof(struct nvm_rq)); |
|
|
|
nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas); |
|
nvm_rq_tgt_to_dev(tgt_dev, &rqd); |
|
|
|
ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type); |
|
nvm_free_rqd_ppalist(tgt_dev, &rqd); |
|
if (ret) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nvm_set_chunk_meta); |
|
|
|
static int nvm_core_init(struct nvm_dev *dev) |
|
{ |
|
struct nvm_geo *geo = &dev->geo; |
|
int ret; |
|
|
|
dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns), |
|
sizeof(unsigned long), GFP_KERNEL); |
|
if (!dev->lun_map) |
|
return -ENOMEM; |
|
|
|
INIT_LIST_HEAD(&dev->area_list); |
|
INIT_LIST_HEAD(&dev->targets); |
|
mutex_init(&dev->mlock); |
|
spin_lock_init(&dev->lock); |
|
|
|
ret = nvm_register_map(dev); |
|
if (ret) |
|
goto err_fmtype; |
|
|
|
return 0; |
|
err_fmtype: |
|
kfree(dev->lun_map); |
|
return ret; |
|
} |
|
|
|
static void nvm_free(struct kref *ref) |
|
{ |
|
struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref); |
|
|
|
if (dev->dma_pool) |
|
dev->ops->destroy_dma_pool(dev->dma_pool); |
|
|
|
if (dev->rmap) |
|
nvm_unregister_map(dev); |
|
|
|
kfree(dev->lun_map); |
|
kfree(dev); |
|
} |
|
|
|
static int nvm_init(struct nvm_dev *dev) |
|
{ |
|
struct nvm_geo *geo = &dev->geo; |
|
int ret = -EINVAL; |
|
|
|
if (dev->ops->identity(dev)) { |
|
pr_err("device could not be identified\n"); |
|
goto err; |
|
} |
|
|
|
pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id, |
|
geo->minor_ver_id, geo->vmnt); |
|
|
|
ret = nvm_core_init(dev); |
|
if (ret) { |
|
pr_err("could not initialize core structures.\n"); |
|
goto err; |
|
} |
|
|
|
pr_info("registered %s [%u/%u/%u/%u/%u]\n", |
|
dev->name, dev->geo.ws_min, dev->geo.ws_opt, |
|
dev->geo.num_chk, dev->geo.all_luns, |
|
dev->geo.num_ch); |
|
return 0; |
|
err: |
|
pr_err("failed to initialize nvm\n"); |
|
return ret; |
|
} |
|
|
|
struct nvm_dev *nvm_alloc_dev(int node) |
|
{ |
|
struct nvm_dev *dev; |
|
|
|
dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node); |
|
if (dev) |
|
kref_init(&dev->ref); |
|
|
|
return dev; |
|
} |
|
EXPORT_SYMBOL(nvm_alloc_dev); |
|
|
|
int nvm_register(struct nvm_dev *dev) |
|
{ |
|
int ret, exp_pool_size; |
|
|
|
if (!dev->q || !dev->ops) { |
|
kref_put(&dev->ref, nvm_free); |
|
return -EINVAL; |
|
} |
|
|
|
ret = nvm_init(dev); |
|
if (ret) { |
|
kref_put(&dev->ref, nvm_free); |
|
return ret; |
|
} |
|
|
|
exp_pool_size = max_t(int, PAGE_SIZE, |
|
(NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos))); |
|
exp_pool_size = round_up(exp_pool_size, PAGE_SIZE); |
|
|
|
dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist", |
|
exp_pool_size); |
|
if (!dev->dma_pool) { |
|
pr_err("could not create dma pool\n"); |
|
kref_put(&dev->ref, nvm_free); |
|
return -ENOMEM; |
|
} |
|
|
|
/* register device with a supported media manager */ |
|
down_write(&nvm_lock); |
|
list_add(&dev->devices, &nvm_devices); |
|
up_write(&nvm_lock); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(nvm_register); |
|
|
|
void nvm_unregister(struct nvm_dev *dev) |
|
{ |
|
struct nvm_target *t, *tmp; |
|
|
|
mutex_lock(&dev->mlock); |
|
list_for_each_entry_safe(t, tmp, &dev->targets, list) { |
|
if (t->dev->parent != dev) |
|
continue; |
|
__nvm_remove_target(t, false); |
|
kref_put(&dev->ref, nvm_free); |
|
} |
|
mutex_unlock(&dev->mlock); |
|
|
|
down_write(&nvm_lock); |
|
list_del(&dev->devices); |
|
up_write(&nvm_lock); |
|
|
|
kref_put(&dev->ref, nvm_free); |
|
} |
|
EXPORT_SYMBOL(nvm_unregister); |
|
|
|
static int __nvm_configure_create(struct nvm_ioctl_create *create) |
|
{ |
|
struct nvm_dev *dev; |
|
int ret; |
|
|
|
down_write(&nvm_lock); |
|
dev = nvm_find_nvm_dev(create->dev); |
|
up_write(&nvm_lock); |
|
|
|
if (!dev) { |
|
pr_err("device not found\n"); |
|
return -EINVAL; |
|
} |
|
|
|
kref_get(&dev->ref); |
|
ret = nvm_create_tgt(dev, create); |
|
if (ret) |
|
kref_put(&dev->ref, nvm_free); |
|
|
|
return ret; |
|
} |
|
|
|
static long nvm_ioctl_info(struct file *file, void __user *arg) |
|
{ |
|
struct nvm_ioctl_info *info; |
|
struct nvm_tgt_type *tt; |
|
int tgt_iter = 0; |
|
|
|
info = memdup_user(arg, sizeof(struct nvm_ioctl_info)); |
|
if (IS_ERR(info)) |
|
return -EFAULT; |
|
|
|
info->version[0] = NVM_VERSION_MAJOR; |
|
info->version[1] = NVM_VERSION_MINOR; |
|
info->version[2] = NVM_VERSION_PATCH; |
|
|
|
down_write(&nvm_tgtt_lock); |
|
list_for_each_entry(tt, &nvm_tgt_types, list) { |
|
struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; |
|
|
|
tgt->version[0] = tt->version[0]; |
|
tgt->version[1] = tt->version[1]; |
|
tgt->version[2] = tt->version[2]; |
|
strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX); |
|
|
|
tgt_iter++; |
|
} |
|
|
|
info->tgtsize = tgt_iter; |
|
up_write(&nvm_tgtt_lock); |
|
|
|
if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) { |
|
kfree(info); |
|
return -EFAULT; |
|
} |
|
|
|
kfree(info); |
|
return 0; |
|
} |
|
|
|
static long nvm_ioctl_get_devices(struct file *file, void __user *arg) |
|
{ |
|
struct nvm_ioctl_get_devices *devices; |
|
struct nvm_dev *dev; |
|
int i = 0; |
|
|
|
devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL); |
|
if (!devices) |
|
return -ENOMEM; |
|
|
|
down_write(&nvm_lock); |
|
list_for_each_entry(dev, &nvm_devices, devices) { |
|
struct nvm_ioctl_device_info *info = &devices->info[i]; |
|
|
|
strlcpy(info->devname, dev->name, sizeof(info->devname)); |
|
|
|
/* kept for compatibility */ |
|
info->bmversion[0] = 1; |
|
info->bmversion[1] = 0; |
|
info->bmversion[2] = 0; |
|
strlcpy(info->bmname, "gennvm", sizeof(info->bmname)); |
|
i++; |
|
|
|
if (i >= ARRAY_SIZE(devices->info)) { |
|
pr_err("max %zd devices can be reported.\n", |
|
ARRAY_SIZE(devices->info)); |
|
break; |
|
} |
|
} |
|
up_write(&nvm_lock); |
|
|
|
devices->nr_devices = i; |
|
|
|
if (copy_to_user(arg, devices, |
|
sizeof(struct nvm_ioctl_get_devices))) { |
|
kfree(devices); |
|
return -EFAULT; |
|
} |
|
|
|
kfree(devices); |
|
return 0; |
|
} |
|
|
|
static long nvm_ioctl_dev_create(struct file *file, void __user *arg) |
|
{ |
|
struct nvm_ioctl_create create; |
|
|
|
if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) |
|
return -EFAULT; |
|
|
|
if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED && |
|
create.conf.e.rsv != 0) { |
|
pr_err("reserved config field in use\n"); |
|
return -EINVAL; |
|
} |
|
|
|
create.dev[DISK_NAME_LEN - 1] = '\0'; |
|
create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0'; |
|
create.tgtname[DISK_NAME_LEN - 1] = '\0'; |
|
|
|
if (create.flags != 0) { |
|
__u32 flags = create.flags; |
|
|
|
/* Check for valid flags */ |
|
if (flags & NVM_TARGET_FACTORY) |
|
flags &= ~NVM_TARGET_FACTORY; |
|
|
|
if (flags) { |
|
pr_err("flag not supported\n"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return __nvm_configure_create(&create); |
|
} |
|
|
|
static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) |
|
{ |
|
struct nvm_ioctl_remove remove; |
|
|
|
if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove))) |
|
return -EFAULT; |
|
|
|
remove.tgtname[DISK_NAME_LEN - 1] = '\0'; |
|
|
|
if (remove.flags != 0) { |
|
pr_err("no flags supported\n"); |
|
return -EINVAL; |
|
} |
|
|
|
return nvm_remove_tgt(&remove); |
|
} |
|
|
|
/* kept for compatibility reasons */ |
|
static long nvm_ioctl_dev_init(struct file *file, void __user *arg) |
|
{ |
|
struct nvm_ioctl_dev_init init; |
|
|
|
if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init))) |
|
return -EFAULT; |
|
|
|
if (init.flags != 0) { |
|
pr_err("no flags supported\n"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* Kept for compatibility reasons */ |
|
static long nvm_ioctl_dev_factory(struct file *file, void __user *arg) |
|
{ |
|
struct nvm_ioctl_dev_factory fact; |
|
|
|
if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory))) |
|
return -EFAULT; |
|
|
|
fact.dev[DISK_NAME_LEN - 1] = '\0'; |
|
|
|
if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) |
|
{ |
|
void __user *argp = (void __user *)arg; |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
switch (cmd) { |
|
case NVM_INFO: |
|
return nvm_ioctl_info(file, argp); |
|
case NVM_GET_DEVICES: |
|
return nvm_ioctl_get_devices(file, argp); |
|
case NVM_DEV_CREATE: |
|
return nvm_ioctl_dev_create(file, argp); |
|
case NVM_DEV_REMOVE: |
|
return nvm_ioctl_dev_remove(file, argp); |
|
case NVM_DEV_INIT: |
|
return nvm_ioctl_dev_init(file, argp); |
|
case NVM_DEV_FACTORY: |
|
return nvm_ioctl_dev_factory(file, argp); |
|
} |
|
return 0; |
|
} |
|
|
|
static const struct file_operations _ctl_fops = { |
|
.open = nonseekable_open, |
|
.unlocked_ioctl = nvm_ctl_ioctl, |
|
.owner = THIS_MODULE, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static struct miscdevice _nvm_misc = { |
|
.minor = MISC_DYNAMIC_MINOR, |
|
.name = "lightnvm", |
|
.nodename = "lightnvm/control", |
|
.fops = &_ctl_fops, |
|
}; |
|
builtin_misc_device(_nvm_misc);
|
|
|