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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Christoph Hellwig](/assets/img/avatar_default.png)
Current make_request based drivers use either blk_alloc_queue_node or blk_alloc_queue to allocate a queue, and then set up the make_request_fn function pointer and a few parameters using the blk_queue_make_request helper. Simplify this by passing the make_request pointer to blk_alloc_queue, and while at it merge the _node variant into the main helper by always passing a node_id, and remove the superfluous gfp_mask parameter. A lower-level __blk_alloc_queue is kept for the blk-mq case. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
1456 lines
31 KiB
C
1456 lines
31 KiB
C
// 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 <m@bjorling.me>
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*/
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#define pr_fmt(fmt) "nvm: " fmt
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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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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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/* 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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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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static void nvm_free(struct kref *ref);
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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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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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return NULL;
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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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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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out:
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up_write(&nvm_lock);
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return ret;
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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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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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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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return -EBUSY;
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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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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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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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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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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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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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kfree(ch_map->lun_offs);
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}
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kfree(dev_map->chnls);
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kfree(dev_map);
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kfree(tgt_dev->luns);
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kfree(tgt_dev);
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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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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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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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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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/* 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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/* Inherit device geometry from parent */
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memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
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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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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 const struct block_device_operations nvm_fops = {
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.owner = THIS_MODULE,
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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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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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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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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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/* 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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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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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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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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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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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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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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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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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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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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tqueue = blk_alloc_queue(tt->make_rq, 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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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 = &nvm_fops;
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tdisk->queue = tqueue;
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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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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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set_capacity(tdisk, tt->capacity(targetdata));
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add_disk(tdisk);
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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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t->type = tt;
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t->disk = tdisk;
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t->dev = tgt_dev;
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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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__module_get(tt->owner);
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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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|
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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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/**
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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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}
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up_read(&nvm_lock);
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|
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if (!t) {
|
|
pr_err("failed to remove target %s\n",
|
|
remove->tgtname);
|
|
return 1;
|
|
}
|
|
|
|
__nvm_remove_target(t, true);
|
|
kref_put(&dev->ref, nvm_free);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nvm_register_map(struct nvm_dev *dev)
|
|
{
|
|
struct nvm_dev_map *rmap;
|
|
int i, j;
|
|
|
|
rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
|
|
if (!rmap)
|
|
goto err_rmap;
|
|
|
|
rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map),
|
|
GFP_KERNEL);
|
|
if (!rmap->chnls)
|
|
goto err_chnls;
|
|
|
|
for (i = 0; i < dev->geo.num_ch; i++) {
|
|
struct nvm_ch_map *ch_rmap;
|
|
int *lun_roffs;
|
|
int luns_in_chnl = dev->geo.num_lun;
|
|
|
|
ch_rmap = &rmap->chnls[i];
|
|
|
|
ch_rmap->ch_off = -1;
|
|
ch_rmap->num_lun = luns_in_chnl;
|
|
|
|
lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
|
|
if (!lun_roffs)
|
|
goto err_ch;
|
|
|
|
for (j = 0; j < luns_in_chnl; j++)
|
|
lun_roffs[j] = -1;
|
|
|
|
ch_rmap->lun_offs = lun_roffs;
|
|
}
|
|
|
|
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);
|
|
if (ret)
|
|
return ret;
|
|
|
|
__free_page(page);
|
|
|
|
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 > 31) {
|
|
pr_err("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 (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);
|