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![Christoph Hellwig](/assets/img/avatar_default.png)
Convert the nvdimm-btt driver to use the blk_alloc_disk and blk_cleanup_disk helpers to simplify gendisk and request_queue allocation. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Link: https://lore.kernel.org/r/20210521055116.1053587-17-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
1737 lines
43 KiB
C
1737 lines
43 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Block Translation Table
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* Copyright (c) 2014-2015, Intel Corporation.
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*/
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#include <linux/highmem.h>
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#include <linux/debugfs.h>
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#include <linux/blkdev.h>
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#include <linux/pagemap.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/hdreg.h>
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#include <linux/genhd.h>
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#include <linux/sizes.h>
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#include <linux/ndctl.h>
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#include <linux/fs.h>
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#include <linux/nd.h>
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#include <linux/backing-dev.h>
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#include "btt.h"
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#include "nd.h"
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enum log_ent_request {
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LOG_NEW_ENT = 0,
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LOG_OLD_ENT
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};
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static struct device *to_dev(struct arena_info *arena)
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{
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return &arena->nd_btt->dev;
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}
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static u64 adjust_initial_offset(struct nd_btt *nd_btt, u64 offset)
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{
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return offset + nd_btt->initial_offset;
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}
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static int arena_read_bytes(struct arena_info *arena, resource_size_t offset,
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void *buf, size_t n, unsigned long flags)
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{
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struct nd_btt *nd_btt = arena->nd_btt;
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struct nd_namespace_common *ndns = nd_btt->ndns;
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/* arena offsets may be shifted from the base of the device */
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offset = adjust_initial_offset(nd_btt, offset);
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return nvdimm_read_bytes(ndns, offset, buf, n, flags);
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}
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static int arena_write_bytes(struct arena_info *arena, resource_size_t offset,
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void *buf, size_t n, unsigned long flags)
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{
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struct nd_btt *nd_btt = arena->nd_btt;
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struct nd_namespace_common *ndns = nd_btt->ndns;
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/* arena offsets may be shifted from the base of the device */
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offset = adjust_initial_offset(nd_btt, offset);
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return nvdimm_write_bytes(ndns, offset, buf, n, flags);
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}
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static int btt_info_write(struct arena_info *arena, struct btt_sb *super)
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{
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int ret;
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/*
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* infooff and info2off should always be at least 512B aligned.
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* We rely on that to make sure rw_bytes does error clearing
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* correctly, so make sure that is the case.
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*/
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dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->infooff, 512),
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"arena->infooff: %#llx is unaligned\n", arena->infooff);
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dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->info2off, 512),
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"arena->info2off: %#llx is unaligned\n", arena->info2off);
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ret = arena_write_bytes(arena, arena->info2off, super,
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sizeof(struct btt_sb), 0);
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if (ret)
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return ret;
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return arena_write_bytes(arena, arena->infooff, super,
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sizeof(struct btt_sb), 0);
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}
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static int btt_info_read(struct arena_info *arena, struct btt_sb *super)
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{
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return arena_read_bytes(arena, arena->infooff, super,
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sizeof(struct btt_sb), 0);
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}
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/*
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* 'raw' version of btt_map write
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* Assumptions:
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* mapping is in little-endian
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* mapping contains 'E' and 'Z' flags as desired
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*/
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static int __btt_map_write(struct arena_info *arena, u32 lba, __le32 mapping,
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unsigned long flags)
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{
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u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE);
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if (unlikely(lba >= arena->external_nlba))
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dev_err_ratelimited(to_dev(arena),
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"%s: lba %#x out of range (max: %#x)\n",
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__func__, lba, arena->external_nlba);
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return arena_write_bytes(arena, ns_off, &mapping, MAP_ENT_SIZE, flags);
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}
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static int btt_map_write(struct arena_info *arena, u32 lba, u32 mapping,
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u32 z_flag, u32 e_flag, unsigned long rwb_flags)
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{
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u32 ze;
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__le32 mapping_le;
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/*
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* This 'mapping' is supposed to be just the LBA mapping, without
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* any flags set, so strip the flag bits.
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*/
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mapping = ent_lba(mapping);
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ze = (z_flag << 1) + e_flag;
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switch (ze) {
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case 0:
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/*
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* We want to set neither of the Z or E flags, and
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* in the actual layout, this means setting the bit
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* positions of both to '1' to indicate a 'normal'
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* map entry
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*/
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mapping |= MAP_ENT_NORMAL;
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break;
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case 1:
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mapping |= (1 << MAP_ERR_SHIFT);
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break;
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case 2:
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mapping |= (1 << MAP_TRIM_SHIFT);
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break;
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default:
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/*
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* The case where Z and E are both sent in as '1' could be
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* construed as a valid 'normal' case, but we decide not to,
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* to avoid confusion
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*/
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dev_err_ratelimited(to_dev(arena),
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"Invalid use of Z and E flags\n");
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return -EIO;
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}
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mapping_le = cpu_to_le32(mapping);
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return __btt_map_write(arena, lba, mapping_le, rwb_flags);
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}
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static int btt_map_read(struct arena_info *arena, u32 lba, u32 *mapping,
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int *trim, int *error, unsigned long rwb_flags)
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{
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int ret;
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__le32 in;
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u32 raw_mapping, postmap, ze, z_flag, e_flag;
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u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE);
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if (unlikely(lba >= arena->external_nlba))
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dev_err_ratelimited(to_dev(arena),
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"%s: lba %#x out of range (max: %#x)\n",
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__func__, lba, arena->external_nlba);
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ret = arena_read_bytes(arena, ns_off, &in, MAP_ENT_SIZE, rwb_flags);
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if (ret)
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return ret;
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raw_mapping = le32_to_cpu(in);
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z_flag = ent_z_flag(raw_mapping);
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e_flag = ent_e_flag(raw_mapping);
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ze = (z_flag << 1) + e_flag;
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postmap = ent_lba(raw_mapping);
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/* Reuse the {z,e}_flag variables for *trim and *error */
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z_flag = 0;
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e_flag = 0;
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switch (ze) {
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case 0:
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/* Initial state. Return postmap = premap */
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*mapping = lba;
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break;
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case 1:
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*mapping = postmap;
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e_flag = 1;
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break;
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case 2:
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*mapping = postmap;
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z_flag = 1;
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break;
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case 3:
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*mapping = postmap;
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break;
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default:
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return -EIO;
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}
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if (trim)
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*trim = z_flag;
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if (error)
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*error = e_flag;
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return ret;
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}
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static int btt_log_group_read(struct arena_info *arena, u32 lane,
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struct log_group *log)
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{
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return arena_read_bytes(arena,
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arena->logoff + (lane * LOG_GRP_SIZE), log,
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LOG_GRP_SIZE, 0);
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}
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static struct dentry *debugfs_root;
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static void arena_debugfs_init(struct arena_info *a, struct dentry *parent,
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int idx)
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{
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char dirname[32];
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struct dentry *d;
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/* If for some reason, parent bttN was not created, exit */
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if (!parent)
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return;
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snprintf(dirname, 32, "arena%d", idx);
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d = debugfs_create_dir(dirname, parent);
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if (IS_ERR_OR_NULL(d))
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return;
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a->debugfs_dir = d;
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debugfs_create_x64("size", S_IRUGO, d, &a->size);
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debugfs_create_x64("external_lba_start", S_IRUGO, d,
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&a->external_lba_start);
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debugfs_create_x32("internal_nlba", S_IRUGO, d, &a->internal_nlba);
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debugfs_create_u32("internal_lbasize", S_IRUGO, d,
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&a->internal_lbasize);
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debugfs_create_x32("external_nlba", S_IRUGO, d, &a->external_nlba);
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debugfs_create_u32("external_lbasize", S_IRUGO, d,
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&a->external_lbasize);
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debugfs_create_u32("nfree", S_IRUGO, d, &a->nfree);
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debugfs_create_u16("version_major", S_IRUGO, d, &a->version_major);
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debugfs_create_u16("version_minor", S_IRUGO, d, &a->version_minor);
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debugfs_create_x64("nextoff", S_IRUGO, d, &a->nextoff);
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debugfs_create_x64("infooff", S_IRUGO, d, &a->infooff);
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debugfs_create_x64("dataoff", S_IRUGO, d, &a->dataoff);
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debugfs_create_x64("mapoff", S_IRUGO, d, &a->mapoff);
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debugfs_create_x64("logoff", S_IRUGO, d, &a->logoff);
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debugfs_create_x64("info2off", S_IRUGO, d, &a->info2off);
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debugfs_create_x32("flags", S_IRUGO, d, &a->flags);
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debugfs_create_u32("log_index_0", S_IRUGO, d, &a->log_index[0]);
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debugfs_create_u32("log_index_1", S_IRUGO, d, &a->log_index[1]);
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}
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static void btt_debugfs_init(struct btt *btt)
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{
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int i = 0;
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struct arena_info *arena;
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btt->debugfs_dir = debugfs_create_dir(dev_name(&btt->nd_btt->dev),
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debugfs_root);
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if (IS_ERR_OR_NULL(btt->debugfs_dir))
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return;
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list_for_each_entry(arena, &btt->arena_list, list) {
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arena_debugfs_init(arena, btt->debugfs_dir, i);
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i++;
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}
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}
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static u32 log_seq(struct log_group *log, int log_idx)
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{
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return le32_to_cpu(log->ent[log_idx].seq);
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}
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/*
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* This function accepts two log entries, and uses the
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* sequence number to find the 'older' entry.
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* It also updates the sequence number in this old entry to
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* make it the 'new' one if the mark_flag is set.
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* Finally, it returns which of the entries was the older one.
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*
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* TODO The logic feels a bit kludge-y. make it better..
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*/
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static int btt_log_get_old(struct arena_info *a, struct log_group *log)
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{
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int idx0 = a->log_index[0];
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int idx1 = a->log_index[1];
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int old;
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/*
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* the first ever time this is seen, the entry goes into [0]
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* the next time, the following logic works out to put this
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* (next) entry into [1]
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*/
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if (log_seq(log, idx0) == 0) {
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log->ent[idx0].seq = cpu_to_le32(1);
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return 0;
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}
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if (log_seq(log, idx0) == log_seq(log, idx1))
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return -EINVAL;
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if (log_seq(log, idx0) + log_seq(log, idx1) > 5)
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return -EINVAL;
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if (log_seq(log, idx0) < log_seq(log, idx1)) {
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if ((log_seq(log, idx1) - log_seq(log, idx0)) == 1)
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old = 0;
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else
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old = 1;
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} else {
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if ((log_seq(log, idx0) - log_seq(log, idx1)) == 1)
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old = 1;
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else
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old = 0;
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}
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return old;
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}
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/*
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* This function copies the desired (old/new) log entry into ent if
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* it is not NULL. It returns the sub-slot number (0 or 1)
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* where the desired log entry was found. Negative return values
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* indicate errors.
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*/
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static int btt_log_read(struct arena_info *arena, u32 lane,
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struct log_entry *ent, int old_flag)
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{
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int ret;
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int old_ent, ret_ent;
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struct log_group log;
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ret = btt_log_group_read(arena, lane, &log);
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if (ret)
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return -EIO;
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old_ent = btt_log_get_old(arena, &log);
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if (old_ent < 0 || old_ent > 1) {
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dev_err(to_dev(arena),
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"log corruption (%d): lane %d seq [%d, %d]\n",
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old_ent, lane, log.ent[arena->log_index[0]].seq,
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log.ent[arena->log_index[1]].seq);
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/* TODO set error state? */
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return -EIO;
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}
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ret_ent = (old_flag ? old_ent : (1 - old_ent));
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if (ent != NULL)
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memcpy(ent, &log.ent[arena->log_index[ret_ent]], LOG_ENT_SIZE);
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return ret_ent;
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}
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/*
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* This function commits a log entry to media
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* It does _not_ prepare the freelist entry for the next write
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* btt_flog_write is the wrapper for updating the freelist elements
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*/
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static int __btt_log_write(struct arena_info *arena, u32 lane,
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u32 sub, struct log_entry *ent, unsigned long flags)
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{
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int ret;
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u32 group_slot = arena->log_index[sub];
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unsigned int log_half = LOG_ENT_SIZE / 2;
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void *src = ent;
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u64 ns_off;
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ns_off = arena->logoff + (lane * LOG_GRP_SIZE) +
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(group_slot * LOG_ENT_SIZE);
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/* split the 16B write into atomic, durable halves */
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ret = arena_write_bytes(arena, ns_off, src, log_half, flags);
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if (ret)
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return ret;
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ns_off += log_half;
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src += log_half;
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return arena_write_bytes(arena, ns_off, src, log_half, flags);
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}
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static int btt_flog_write(struct arena_info *arena, u32 lane, u32 sub,
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struct log_entry *ent)
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{
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int ret;
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ret = __btt_log_write(arena, lane, sub, ent, NVDIMM_IO_ATOMIC);
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if (ret)
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return ret;
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/* prepare the next free entry */
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arena->freelist[lane].sub = 1 - arena->freelist[lane].sub;
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if (++(arena->freelist[lane].seq) == 4)
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arena->freelist[lane].seq = 1;
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if (ent_e_flag(le32_to_cpu(ent->old_map)))
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arena->freelist[lane].has_err = 1;
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arena->freelist[lane].block = ent_lba(le32_to_cpu(ent->old_map));
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return ret;
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}
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/*
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* This function initializes the BTT map to the initial state, which is
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* all-zeroes, and indicates an identity mapping
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*/
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static int btt_map_init(struct arena_info *arena)
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{
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int ret = -EINVAL;
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void *zerobuf;
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size_t offset = 0;
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size_t chunk_size = SZ_2M;
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size_t mapsize = arena->logoff - arena->mapoff;
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zerobuf = kzalloc(chunk_size, GFP_KERNEL);
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if (!zerobuf)
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return -ENOMEM;
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|
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/*
|
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* mapoff should always be at least 512B aligned. We rely on that to
|
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* make sure rw_bytes does error clearing correctly, so make sure that
|
|
* is the case.
|
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*/
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dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->mapoff, 512),
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"arena->mapoff: %#llx is unaligned\n", arena->mapoff);
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while (mapsize) {
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size_t size = min(mapsize, chunk_size);
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dev_WARN_ONCE(to_dev(arena), size < 512,
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"chunk size: %#zx is unaligned\n", size);
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ret = arena_write_bytes(arena, arena->mapoff + offset, zerobuf,
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size, 0);
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if (ret)
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goto free;
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offset += size;
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mapsize -= size;
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cond_resched();
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}
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free:
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kfree(zerobuf);
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return ret;
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}
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/*
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* This function initializes the BTT log with 'fake' entries pointing
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* to the initial reserved set of blocks as being free
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*/
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static int btt_log_init(struct arena_info *arena)
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{
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size_t logsize = arena->info2off - arena->logoff;
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size_t chunk_size = SZ_4K, offset = 0;
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struct log_entry ent;
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void *zerobuf;
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int ret;
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u32 i;
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zerobuf = kzalloc(chunk_size, GFP_KERNEL);
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if (!zerobuf)
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return -ENOMEM;
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/*
|
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* logoff should always be at least 512B aligned. We rely on that to
|
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* make sure rw_bytes does error clearing correctly, so make sure that
|
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* is the case.
|
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*/
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dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->logoff, 512),
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"arena->logoff: %#llx is unaligned\n", arena->logoff);
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while (logsize) {
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size_t size = min(logsize, chunk_size);
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dev_WARN_ONCE(to_dev(arena), size < 512,
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"chunk size: %#zx is unaligned\n", size);
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|
ret = arena_write_bytes(arena, arena->logoff + offset, zerobuf,
|
|
size, 0);
|
|
if (ret)
|
|
goto free;
|
|
|
|
offset += size;
|
|
logsize -= size;
|
|
cond_resched();
|
|
}
|
|
|
|
for (i = 0; i < arena->nfree; i++) {
|
|
ent.lba = cpu_to_le32(i);
|
|
ent.old_map = cpu_to_le32(arena->external_nlba + i);
|
|
ent.new_map = cpu_to_le32(arena->external_nlba + i);
|
|
ent.seq = cpu_to_le32(LOG_SEQ_INIT);
|
|
ret = __btt_log_write(arena, i, 0, &ent, 0);
|
|
if (ret)
|
|
goto free;
|
|
}
|
|
|
|
free:
|
|
kfree(zerobuf);
|
|
return ret;
|
|
}
|
|
|
|
static u64 to_namespace_offset(struct arena_info *arena, u64 lba)
|
|
{
|
|
return arena->dataoff + ((u64)lba * arena->internal_lbasize);
|
|
}
|
|
|
|
static int arena_clear_freelist_error(struct arena_info *arena, u32 lane)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (arena->freelist[lane].has_err) {
|
|
void *zero_page = page_address(ZERO_PAGE(0));
|
|
u32 lba = arena->freelist[lane].block;
|
|
u64 nsoff = to_namespace_offset(arena, lba);
|
|
unsigned long len = arena->sector_size;
|
|
|
|
mutex_lock(&arena->err_lock);
|
|
|
|
while (len) {
|
|
unsigned long chunk = min(len, PAGE_SIZE);
|
|
|
|
ret = arena_write_bytes(arena, nsoff, zero_page,
|
|
chunk, 0);
|
|
if (ret)
|
|
break;
|
|
len -= chunk;
|
|
nsoff += chunk;
|
|
if (len == 0)
|
|
arena->freelist[lane].has_err = 0;
|
|
}
|
|
mutex_unlock(&arena->err_lock);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int btt_freelist_init(struct arena_info *arena)
|
|
{
|
|
int new, ret;
|
|
struct log_entry log_new;
|
|
u32 i, map_entry, log_oldmap, log_newmap;
|
|
|
|
arena->freelist = kcalloc(arena->nfree, sizeof(struct free_entry),
|
|
GFP_KERNEL);
|
|
if (!arena->freelist)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < arena->nfree; i++) {
|
|
new = btt_log_read(arena, i, &log_new, LOG_NEW_ENT);
|
|
if (new < 0)
|
|
return new;
|
|
|
|
/* old and new map entries with any flags stripped out */
|
|
log_oldmap = ent_lba(le32_to_cpu(log_new.old_map));
|
|
log_newmap = ent_lba(le32_to_cpu(log_new.new_map));
|
|
|
|
/* sub points to the next one to be overwritten */
|
|
arena->freelist[i].sub = 1 - new;
|
|
arena->freelist[i].seq = nd_inc_seq(le32_to_cpu(log_new.seq));
|
|
arena->freelist[i].block = log_oldmap;
|
|
|
|
/*
|
|
* FIXME: if error clearing fails during init, we want to make
|
|
* the BTT read-only
|
|
*/
|
|
if (ent_e_flag(le32_to_cpu(log_new.old_map)) &&
|
|
!ent_normal(le32_to_cpu(log_new.old_map))) {
|
|
arena->freelist[i].has_err = 1;
|
|
ret = arena_clear_freelist_error(arena, i);
|
|
if (ret)
|
|
dev_err_ratelimited(to_dev(arena),
|
|
"Unable to clear known errors\n");
|
|
}
|
|
|
|
/* This implies a newly created or untouched flog entry */
|
|
if (log_oldmap == log_newmap)
|
|
continue;
|
|
|
|
/* Check if map recovery is needed */
|
|
ret = btt_map_read(arena, le32_to_cpu(log_new.lba), &map_entry,
|
|
NULL, NULL, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* The map_entry from btt_read_map is stripped of any flag bits,
|
|
* so use the stripped out versions from the log as well for
|
|
* testing whether recovery is needed. For restoration, use the
|
|
* 'raw' version of the log entries as that captured what we
|
|
* were going to write originally.
|
|
*/
|
|
if ((log_newmap != map_entry) && (log_oldmap == map_entry)) {
|
|
/*
|
|
* Last transaction wrote the flog, but wasn't able
|
|
* to complete the map write. So fix up the map.
|
|
*/
|
|
ret = btt_map_write(arena, le32_to_cpu(log_new.lba),
|
|
le32_to_cpu(log_new.new_map), 0, 0, 0);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool ent_is_padding(struct log_entry *ent)
|
|
{
|
|
return (ent->lba == 0) && (ent->old_map == 0) && (ent->new_map == 0)
|
|
&& (ent->seq == 0);
|
|
}
|
|
|
|
/*
|
|
* Detecting valid log indices: We read a log group (see the comments in btt.h
|
|
* for a description of a 'log_group' and its 'slots'), and iterate over its
|
|
* four slots. We expect that a padding slot will be all-zeroes, and use this
|
|
* to detect a padding slot vs. an actual entry.
|
|
*
|
|
* If a log_group is in the initial state, i.e. hasn't been used since the
|
|
* creation of this BTT layout, it will have three of the four slots with
|
|
* zeroes. We skip over these log_groups for the detection of log_index. If
|
|
* all log_groups are in the initial state (i.e. the BTT has never been
|
|
* written to), it is safe to assume the 'new format' of log entries in slots
|
|
* (0, 1).
|
|
*/
|
|
static int log_set_indices(struct arena_info *arena)
|
|
{
|
|
bool idx_set = false, initial_state = true;
|
|
int ret, log_index[2] = {-1, -1};
|
|
u32 i, j, next_idx = 0;
|
|
struct log_group log;
|
|
u32 pad_count = 0;
|
|
|
|
for (i = 0; i < arena->nfree; i++) {
|
|
ret = btt_log_group_read(arena, i, &log);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (j = 0; j < 4; j++) {
|
|
if (!idx_set) {
|
|
if (ent_is_padding(&log.ent[j])) {
|
|
pad_count++;
|
|
continue;
|
|
} else {
|
|
/* Skip if index has been recorded */
|
|
if ((next_idx == 1) &&
|
|
(j == log_index[0]))
|
|
continue;
|
|
/* valid entry, record index */
|
|
log_index[next_idx] = j;
|
|
next_idx++;
|
|
}
|
|
if (next_idx == 2) {
|
|
/* two valid entries found */
|
|
idx_set = true;
|
|
} else if (next_idx > 2) {
|
|
/* too many valid indices */
|
|
return -ENXIO;
|
|
}
|
|
} else {
|
|
/*
|
|
* once the indices have been set, just verify
|
|
* that all subsequent log groups are either in
|
|
* their initial state or follow the same
|
|
* indices.
|
|
*/
|
|
if (j == log_index[0]) {
|
|
/* entry must be 'valid' */
|
|
if (ent_is_padding(&log.ent[j]))
|
|
return -ENXIO;
|
|
} else if (j == log_index[1]) {
|
|
;
|
|
/*
|
|
* log_index[1] can be padding if the
|
|
* lane never got used and it is still
|
|
* in the initial state (three 'padding'
|
|
* entries)
|
|
*/
|
|
} else {
|
|
/* entry must be invalid (padding) */
|
|
if (!ent_is_padding(&log.ent[j]))
|
|
return -ENXIO;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* If any of the log_groups have more than one valid,
|
|
* non-padding entry, then the we are no longer in the
|
|
* initial_state
|
|
*/
|
|
if (pad_count < 3)
|
|
initial_state = false;
|
|
pad_count = 0;
|
|
}
|
|
|
|
if (!initial_state && !idx_set)
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* If all the entries in the log were in the initial state,
|
|
* assume new padding scheme
|
|
*/
|
|
if (initial_state)
|
|
log_index[1] = 1;
|
|
|
|
/*
|
|
* Only allow the known permutations of log/padding indices,
|
|
* i.e. (0, 1), and (0, 2)
|
|
*/
|
|
if ((log_index[0] == 0) && ((log_index[1] == 1) || (log_index[1] == 2)))
|
|
; /* known index possibilities */
|
|
else {
|
|
dev_err(to_dev(arena), "Found an unknown padding scheme\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
arena->log_index[0] = log_index[0];
|
|
arena->log_index[1] = log_index[1];
|
|
dev_dbg(to_dev(arena), "log_index_0 = %d\n", log_index[0]);
|
|
dev_dbg(to_dev(arena), "log_index_1 = %d\n", log_index[1]);
|
|
return 0;
|
|
}
|
|
|
|
static int btt_rtt_init(struct arena_info *arena)
|
|
{
|
|
arena->rtt = kcalloc(arena->nfree, sizeof(u32), GFP_KERNEL);
|
|
if (arena->rtt == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btt_maplocks_init(struct arena_info *arena)
|
|
{
|
|
u32 i;
|
|
|
|
arena->map_locks = kcalloc(arena->nfree, sizeof(struct aligned_lock),
|
|
GFP_KERNEL);
|
|
if (!arena->map_locks)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < arena->nfree; i++)
|
|
spin_lock_init(&arena->map_locks[i].lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct arena_info *alloc_arena(struct btt *btt, size_t size,
|
|
size_t start, size_t arena_off)
|
|
{
|
|
struct arena_info *arena;
|
|
u64 logsize, mapsize, datasize;
|
|
u64 available = size;
|
|
|
|
arena = kzalloc(sizeof(struct arena_info), GFP_KERNEL);
|
|
if (!arena)
|
|
return NULL;
|
|
arena->nd_btt = btt->nd_btt;
|
|
arena->sector_size = btt->sector_size;
|
|
mutex_init(&arena->err_lock);
|
|
|
|
if (!size)
|
|
return arena;
|
|
|
|
arena->size = size;
|
|
arena->external_lba_start = start;
|
|
arena->external_lbasize = btt->lbasize;
|
|
arena->internal_lbasize = roundup(arena->external_lbasize,
|
|
INT_LBASIZE_ALIGNMENT);
|
|
arena->nfree = BTT_DEFAULT_NFREE;
|
|
arena->version_major = btt->nd_btt->version_major;
|
|
arena->version_minor = btt->nd_btt->version_minor;
|
|
|
|
if (available % BTT_PG_SIZE)
|
|
available -= (available % BTT_PG_SIZE);
|
|
|
|
/* Two pages are reserved for the super block and its copy */
|
|
available -= 2 * BTT_PG_SIZE;
|
|
|
|
/* The log takes a fixed amount of space based on nfree */
|
|
logsize = roundup(arena->nfree * LOG_GRP_SIZE, BTT_PG_SIZE);
|
|
available -= logsize;
|
|
|
|
/* Calculate optimal split between map and data area */
|
|
arena->internal_nlba = div_u64(available - BTT_PG_SIZE,
|
|
arena->internal_lbasize + MAP_ENT_SIZE);
|
|
arena->external_nlba = arena->internal_nlba - arena->nfree;
|
|
|
|
mapsize = roundup((arena->external_nlba * MAP_ENT_SIZE), BTT_PG_SIZE);
|
|
datasize = available - mapsize;
|
|
|
|
/* 'Absolute' values, relative to start of storage space */
|
|
arena->infooff = arena_off;
|
|
arena->dataoff = arena->infooff + BTT_PG_SIZE;
|
|
arena->mapoff = arena->dataoff + datasize;
|
|
arena->logoff = arena->mapoff + mapsize;
|
|
arena->info2off = arena->logoff + logsize;
|
|
|
|
/* Default log indices are (0,1) */
|
|
arena->log_index[0] = 0;
|
|
arena->log_index[1] = 1;
|
|
return arena;
|
|
}
|
|
|
|
static void free_arenas(struct btt *btt)
|
|
{
|
|
struct arena_info *arena, *next;
|
|
|
|
list_for_each_entry_safe(arena, next, &btt->arena_list, list) {
|
|
list_del(&arena->list);
|
|
kfree(arena->rtt);
|
|
kfree(arena->map_locks);
|
|
kfree(arena->freelist);
|
|
debugfs_remove_recursive(arena->debugfs_dir);
|
|
kfree(arena);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function reads an existing valid btt superblock and
|
|
* populates the corresponding arena_info struct
|
|
*/
|
|
static void parse_arena_meta(struct arena_info *arena, struct btt_sb *super,
|
|
u64 arena_off)
|
|
{
|
|
arena->internal_nlba = le32_to_cpu(super->internal_nlba);
|
|
arena->internal_lbasize = le32_to_cpu(super->internal_lbasize);
|
|
arena->external_nlba = le32_to_cpu(super->external_nlba);
|
|
arena->external_lbasize = le32_to_cpu(super->external_lbasize);
|
|
arena->nfree = le32_to_cpu(super->nfree);
|
|
arena->version_major = le16_to_cpu(super->version_major);
|
|
arena->version_minor = le16_to_cpu(super->version_minor);
|
|
|
|
arena->nextoff = (super->nextoff == 0) ? 0 : (arena_off +
|
|
le64_to_cpu(super->nextoff));
|
|
arena->infooff = arena_off;
|
|
arena->dataoff = arena_off + le64_to_cpu(super->dataoff);
|
|
arena->mapoff = arena_off + le64_to_cpu(super->mapoff);
|
|
arena->logoff = arena_off + le64_to_cpu(super->logoff);
|
|
arena->info2off = arena_off + le64_to_cpu(super->info2off);
|
|
|
|
arena->size = (le64_to_cpu(super->nextoff) > 0)
|
|
? (le64_to_cpu(super->nextoff))
|
|
: (arena->info2off - arena->infooff + BTT_PG_SIZE);
|
|
|
|
arena->flags = le32_to_cpu(super->flags);
|
|
}
|
|
|
|
static int discover_arenas(struct btt *btt)
|
|
{
|
|
int ret = 0;
|
|
struct arena_info *arena;
|
|
struct btt_sb *super;
|
|
size_t remaining = btt->rawsize;
|
|
u64 cur_nlba = 0;
|
|
size_t cur_off = 0;
|
|
int num_arenas = 0;
|
|
|
|
super = kzalloc(sizeof(*super), GFP_KERNEL);
|
|
if (!super)
|
|
return -ENOMEM;
|
|
|
|
while (remaining) {
|
|
/* Alloc memory for arena */
|
|
arena = alloc_arena(btt, 0, 0, 0);
|
|
if (!arena) {
|
|
ret = -ENOMEM;
|
|
goto out_super;
|
|
}
|
|
|
|
arena->infooff = cur_off;
|
|
ret = btt_info_read(arena, super);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (!nd_btt_arena_is_valid(btt->nd_btt, super)) {
|
|
if (remaining == btt->rawsize) {
|
|
btt->init_state = INIT_NOTFOUND;
|
|
dev_info(to_dev(arena), "No existing arenas\n");
|
|
goto out;
|
|
} else {
|
|
dev_err(to_dev(arena),
|
|
"Found corrupted metadata!\n");
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
arena->external_lba_start = cur_nlba;
|
|
parse_arena_meta(arena, super, cur_off);
|
|
|
|
ret = log_set_indices(arena);
|
|
if (ret) {
|
|
dev_err(to_dev(arena),
|
|
"Unable to deduce log/padding indices\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = btt_freelist_init(arena);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btt_rtt_init(arena);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btt_maplocks_init(arena);
|
|
if (ret)
|
|
goto out;
|
|
|
|
list_add_tail(&arena->list, &btt->arena_list);
|
|
|
|
remaining -= arena->size;
|
|
cur_off += arena->size;
|
|
cur_nlba += arena->external_nlba;
|
|
num_arenas++;
|
|
|
|
if (arena->nextoff == 0)
|
|
break;
|
|
}
|
|
btt->num_arenas = num_arenas;
|
|
btt->nlba = cur_nlba;
|
|
btt->init_state = INIT_READY;
|
|
|
|
kfree(super);
|
|
return ret;
|
|
|
|
out:
|
|
kfree(arena);
|
|
free_arenas(btt);
|
|
out_super:
|
|
kfree(super);
|
|
return ret;
|
|
}
|
|
|
|
static int create_arenas(struct btt *btt)
|
|
{
|
|
size_t remaining = btt->rawsize;
|
|
size_t cur_off = 0;
|
|
|
|
while (remaining) {
|
|
struct arena_info *arena;
|
|
size_t arena_size = min_t(u64, ARENA_MAX_SIZE, remaining);
|
|
|
|
remaining -= arena_size;
|
|
if (arena_size < ARENA_MIN_SIZE)
|
|
break;
|
|
|
|
arena = alloc_arena(btt, arena_size, btt->nlba, cur_off);
|
|
if (!arena) {
|
|
free_arenas(btt);
|
|
return -ENOMEM;
|
|
}
|
|
btt->nlba += arena->external_nlba;
|
|
if (remaining >= ARENA_MIN_SIZE)
|
|
arena->nextoff = arena->size;
|
|
else
|
|
arena->nextoff = 0;
|
|
cur_off += arena_size;
|
|
list_add_tail(&arena->list, &btt->arena_list);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function completes arena initialization by writing
|
|
* all the metadata.
|
|
* It is only called for an uninitialized arena when a write
|
|
* to that arena occurs for the first time.
|
|
*/
|
|
static int btt_arena_write_layout(struct arena_info *arena)
|
|
{
|
|
int ret;
|
|
u64 sum;
|
|
struct btt_sb *super;
|
|
struct nd_btt *nd_btt = arena->nd_btt;
|
|
const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
|
|
|
|
ret = btt_map_init(arena);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = btt_log_init(arena);
|
|
if (ret)
|
|
return ret;
|
|
|
|
super = kzalloc(sizeof(struct btt_sb), GFP_NOIO);
|
|
if (!super)
|
|
return -ENOMEM;
|
|
|
|
strncpy(super->signature, BTT_SIG, BTT_SIG_LEN);
|
|
memcpy(super->uuid, nd_btt->uuid, 16);
|
|
memcpy(super->parent_uuid, parent_uuid, 16);
|
|
super->flags = cpu_to_le32(arena->flags);
|
|
super->version_major = cpu_to_le16(arena->version_major);
|
|
super->version_minor = cpu_to_le16(arena->version_minor);
|
|
super->external_lbasize = cpu_to_le32(arena->external_lbasize);
|
|
super->external_nlba = cpu_to_le32(arena->external_nlba);
|
|
super->internal_lbasize = cpu_to_le32(arena->internal_lbasize);
|
|
super->internal_nlba = cpu_to_le32(arena->internal_nlba);
|
|
super->nfree = cpu_to_le32(arena->nfree);
|
|
super->infosize = cpu_to_le32(sizeof(struct btt_sb));
|
|
super->nextoff = cpu_to_le64(arena->nextoff);
|
|
/*
|
|
* Subtract arena->infooff (arena start) so numbers are relative
|
|
* to 'this' arena
|
|
*/
|
|
super->dataoff = cpu_to_le64(arena->dataoff - arena->infooff);
|
|
super->mapoff = cpu_to_le64(arena->mapoff - arena->infooff);
|
|
super->logoff = cpu_to_le64(arena->logoff - arena->infooff);
|
|
super->info2off = cpu_to_le64(arena->info2off - arena->infooff);
|
|
|
|
super->flags = 0;
|
|
sum = nd_sb_checksum((struct nd_gen_sb *) super);
|
|
super->checksum = cpu_to_le64(sum);
|
|
|
|
ret = btt_info_write(arena, super);
|
|
|
|
kfree(super);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This function completes the initialization for the BTT namespace
|
|
* such that it is ready to accept IOs
|
|
*/
|
|
static int btt_meta_init(struct btt *btt)
|
|
{
|
|
int ret = 0;
|
|
struct arena_info *arena;
|
|
|
|
mutex_lock(&btt->init_lock);
|
|
list_for_each_entry(arena, &btt->arena_list, list) {
|
|
ret = btt_arena_write_layout(arena);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
ret = btt_freelist_init(arena);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
ret = btt_rtt_init(arena);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
ret = btt_maplocks_init(arena);
|
|
if (ret)
|
|
goto unlock;
|
|
}
|
|
|
|
btt->init_state = INIT_READY;
|
|
|
|
unlock:
|
|
mutex_unlock(&btt->init_lock);
|
|
return ret;
|
|
}
|
|
|
|
static u32 btt_meta_size(struct btt *btt)
|
|
{
|
|
return btt->lbasize - btt->sector_size;
|
|
}
|
|
|
|
/*
|
|
* This function calculates the arena in which the given LBA lies
|
|
* by doing a linear walk. This is acceptable since we expect only
|
|
* a few arenas. If we have backing devices that get much larger,
|
|
* we can construct a balanced binary tree of arenas at init time
|
|
* so that this range search becomes faster.
|
|
*/
|
|
static int lba_to_arena(struct btt *btt, sector_t sector, __u32 *premap,
|
|
struct arena_info **arena)
|
|
{
|
|
struct arena_info *arena_list;
|
|
__u64 lba = div_u64(sector << SECTOR_SHIFT, btt->sector_size);
|
|
|
|
list_for_each_entry(arena_list, &btt->arena_list, list) {
|
|
if (lba < arena_list->external_nlba) {
|
|
*arena = arena_list;
|
|
*premap = lba;
|
|
return 0;
|
|
}
|
|
lba -= arena_list->external_nlba;
|
|
}
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* The following (lock_map, unlock_map) are mostly just to improve
|
|
* readability, since they index into an array of locks
|
|
*/
|
|
static void lock_map(struct arena_info *arena, u32 premap)
|
|
__acquires(&arena->map_locks[idx].lock)
|
|
{
|
|
u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree;
|
|
|
|
spin_lock(&arena->map_locks[idx].lock);
|
|
}
|
|
|
|
static void unlock_map(struct arena_info *arena, u32 premap)
|
|
__releases(&arena->map_locks[idx].lock)
|
|
{
|
|
u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree;
|
|
|
|
spin_unlock(&arena->map_locks[idx].lock);
|
|
}
|
|
|
|
static int btt_data_read(struct arena_info *arena, struct page *page,
|
|
unsigned int off, u32 lba, u32 len)
|
|
{
|
|
int ret;
|
|
u64 nsoff = to_namespace_offset(arena, lba);
|
|
void *mem = kmap_atomic(page);
|
|
|
|
ret = arena_read_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC);
|
|
kunmap_atomic(mem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btt_data_write(struct arena_info *arena, u32 lba,
|
|
struct page *page, unsigned int off, u32 len)
|
|
{
|
|
int ret;
|
|
u64 nsoff = to_namespace_offset(arena, lba);
|
|
void *mem = kmap_atomic(page);
|
|
|
|
ret = arena_write_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC);
|
|
kunmap_atomic(mem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void zero_fill_data(struct page *page, unsigned int off, u32 len)
|
|
{
|
|
void *mem = kmap_atomic(page);
|
|
|
|
memset(mem + off, 0, len);
|
|
kunmap_atomic(mem);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INTEGRITY
|
|
static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip,
|
|
struct arena_info *arena, u32 postmap, int rw)
|
|
{
|
|
unsigned int len = btt_meta_size(btt);
|
|
u64 meta_nsoff;
|
|
int ret = 0;
|
|
|
|
if (bip == NULL)
|
|
return 0;
|
|
|
|
meta_nsoff = to_namespace_offset(arena, postmap) + btt->sector_size;
|
|
|
|
while (len) {
|
|
unsigned int cur_len;
|
|
struct bio_vec bv;
|
|
void *mem;
|
|
|
|
bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
|
|
/*
|
|
* The 'bv' obtained from bvec_iter_bvec has its .bv_len and
|
|
* .bv_offset already adjusted for iter->bi_bvec_done, and we
|
|
* can use those directly
|
|
*/
|
|
|
|
cur_len = min(len, bv.bv_len);
|
|
mem = kmap_atomic(bv.bv_page);
|
|
if (rw)
|
|
ret = arena_write_bytes(arena, meta_nsoff,
|
|
mem + bv.bv_offset, cur_len,
|
|
NVDIMM_IO_ATOMIC);
|
|
else
|
|
ret = arena_read_bytes(arena, meta_nsoff,
|
|
mem + bv.bv_offset, cur_len,
|
|
NVDIMM_IO_ATOMIC);
|
|
|
|
kunmap_atomic(mem);
|
|
if (ret)
|
|
return ret;
|
|
|
|
len -= cur_len;
|
|
meta_nsoff += cur_len;
|
|
if (!bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len))
|
|
return -EIO;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
|
static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip,
|
|
struct arena_info *arena, u32 postmap, int rw)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip,
|
|
struct page *page, unsigned int off, sector_t sector,
|
|
unsigned int len)
|
|
{
|
|
int ret = 0;
|
|
int t_flag, e_flag;
|
|
struct arena_info *arena = NULL;
|
|
u32 lane = 0, premap, postmap;
|
|
|
|
while (len) {
|
|
u32 cur_len;
|
|
|
|
lane = nd_region_acquire_lane(btt->nd_region);
|
|
|
|
ret = lba_to_arena(btt, sector, &premap, &arena);
|
|
if (ret)
|
|
goto out_lane;
|
|
|
|
cur_len = min(btt->sector_size, len);
|
|
|
|
ret = btt_map_read(arena, premap, &postmap, &t_flag, &e_flag,
|
|
NVDIMM_IO_ATOMIC);
|
|
if (ret)
|
|
goto out_lane;
|
|
|
|
/*
|
|
* We loop to make sure that the post map LBA didn't change
|
|
* from under us between writing the RTT and doing the actual
|
|
* read.
|
|
*/
|
|
while (1) {
|
|
u32 new_map;
|
|
int new_t, new_e;
|
|
|
|
if (t_flag) {
|
|
zero_fill_data(page, off, cur_len);
|
|
goto out_lane;
|
|
}
|
|
|
|
if (e_flag) {
|
|
ret = -EIO;
|
|
goto out_lane;
|
|
}
|
|
|
|
arena->rtt[lane] = RTT_VALID | postmap;
|
|
/*
|
|
* Barrier to make sure this write is not reordered
|
|
* to do the verification map_read before the RTT store
|
|
*/
|
|
barrier();
|
|
|
|
ret = btt_map_read(arena, premap, &new_map, &new_t,
|
|
&new_e, NVDIMM_IO_ATOMIC);
|
|
if (ret)
|
|
goto out_rtt;
|
|
|
|
if ((postmap == new_map) && (t_flag == new_t) &&
|
|
(e_flag == new_e))
|
|
break;
|
|
|
|
postmap = new_map;
|
|
t_flag = new_t;
|
|
e_flag = new_e;
|
|
}
|
|
|
|
ret = btt_data_read(arena, page, off, postmap, cur_len);
|
|
if (ret) {
|
|
/* Media error - set the e_flag */
|
|
if (btt_map_write(arena, premap, postmap, 0, 1, NVDIMM_IO_ATOMIC))
|
|
dev_warn_ratelimited(to_dev(arena),
|
|
"Error persistently tracking bad blocks at %#x\n",
|
|
premap);
|
|
goto out_rtt;
|
|
}
|
|
|
|
if (bip) {
|
|
ret = btt_rw_integrity(btt, bip, arena, postmap, READ);
|
|
if (ret)
|
|
goto out_rtt;
|
|
}
|
|
|
|
arena->rtt[lane] = RTT_INVALID;
|
|
nd_region_release_lane(btt->nd_region, lane);
|
|
|
|
len -= cur_len;
|
|
off += cur_len;
|
|
sector += btt->sector_size >> SECTOR_SHIFT;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_rtt:
|
|
arena->rtt[lane] = RTT_INVALID;
|
|
out_lane:
|
|
nd_region_release_lane(btt->nd_region, lane);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Normally, arena_{read,write}_bytes will take care of the initial offset
|
|
* adjustment, but in the case of btt_is_badblock, where we query is_bad_pmem,
|
|
* we need the final, raw namespace offset here
|
|
*/
|
|
static bool btt_is_badblock(struct btt *btt, struct arena_info *arena,
|
|
u32 postmap)
|
|
{
|
|
u64 nsoff = adjust_initial_offset(arena->nd_btt,
|
|
to_namespace_offset(arena, postmap));
|
|
sector_t phys_sector = nsoff >> 9;
|
|
|
|
return is_bad_pmem(btt->phys_bb, phys_sector, arena->internal_lbasize);
|
|
}
|
|
|
|
static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip,
|
|
sector_t sector, struct page *page, unsigned int off,
|
|
unsigned int len)
|
|
{
|
|
int ret = 0;
|
|
struct arena_info *arena = NULL;
|
|
u32 premap = 0, old_postmap, new_postmap, lane = 0, i;
|
|
struct log_entry log;
|
|
int sub;
|
|
|
|
while (len) {
|
|
u32 cur_len;
|
|
int e_flag;
|
|
|
|
retry:
|
|
lane = nd_region_acquire_lane(btt->nd_region);
|
|
|
|
ret = lba_to_arena(btt, sector, &premap, &arena);
|
|
if (ret)
|
|
goto out_lane;
|
|
cur_len = min(btt->sector_size, len);
|
|
|
|
if ((arena->flags & IB_FLAG_ERROR_MASK) != 0) {
|
|
ret = -EIO;
|
|
goto out_lane;
|
|
}
|
|
|
|
if (btt_is_badblock(btt, arena, arena->freelist[lane].block))
|
|
arena->freelist[lane].has_err = 1;
|
|
|
|
if (mutex_is_locked(&arena->err_lock)
|
|
|| arena->freelist[lane].has_err) {
|
|
nd_region_release_lane(btt->nd_region, lane);
|
|
|
|
ret = arena_clear_freelist_error(arena, lane);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* OK to acquire a different lane/free block */
|
|
goto retry;
|
|
}
|
|
|
|
new_postmap = arena->freelist[lane].block;
|
|
|
|
/* Wait if the new block is being read from */
|
|
for (i = 0; i < arena->nfree; i++)
|
|
while (arena->rtt[i] == (RTT_VALID | new_postmap))
|
|
cpu_relax();
|
|
|
|
|
|
if (new_postmap >= arena->internal_nlba) {
|
|
ret = -EIO;
|
|
goto out_lane;
|
|
}
|
|
|
|
ret = btt_data_write(arena, new_postmap, page, off, cur_len);
|
|
if (ret)
|
|
goto out_lane;
|
|
|
|
if (bip) {
|
|
ret = btt_rw_integrity(btt, bip, arena, new_postmap,
|
|
WRITE);
|
|
if (ret)
|
|
goto out_lane;
|
|
}
|
|
|
|
lock_map(arena, premap);
|
|
ret = btt_map_read(arena, premap, &old_postmap, NULL, &e_flag,
|
|
NVDIMM_IO_ATOMIC);
|
|
if (ret)
|
|
goto out_map;
|
|
if (old_postmap >= arena->internal_nlba) {
|
|
ret = -EIO;
|
|
goto out_map;
|
|
}
|
|
if (e_flag)
|
|
set_e_flag(old_postmap);
|
|
|
|
log.lba = cpu_to_le32(premap);
|
|
log.old_map = cpu_to_le32(old_postmap);
|
|
log.new_map = cpu_to_le32(new_postmap);
|
|
log.seq = cpu_to_le32(arena->freelist[lane].seq);
|
|
sub = arena->freelist[lane].sub;
|
|
ret = btt_flog_write(arena, lane, sub, &log);
|
|
if (ret)
|
|
goto out_map;
|
|
|
|
ret = btt_map_write(arena, premap, new_postmap, 0, 0,
|
|
NVDIMM_IO_ATOMIC);
|
|
if (ret)
|
|
goto out_map;
|
|
|
|
unlock_map(arena, premap);
|
|
nd_region_release_lane(btt->nd_region, lane);
|
|
|
|
if (e_flag) {
|
|
ret = arena_clear_freelist_error(arena, lane);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
len -= cur_len;
|
|
off += cur_len;
|
|
sector += btt->sector_size >> SECTOR_SHIFT;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_map:
|
|
unlock_map(arena, premap);
|
|
out_lane:
|
|
nd_region_release_lane(btt->nd_region, lane);
|
|
return ret;
|
|
}
|
|
|
|
static int btt_do_bvec(struct btt *btt, struct bio_integrity_payload *bip,
|
|
struct page *page, unsigned int len, unsigned int off,
|
|
unsigned int op, sector_t sector)
|
|
{
|
|
int ret;
|
|
|
|
if (!op_is_write(op)) {
|
|
ret = btt_read_pg(btt, bip, page, off, sector, len);
|
|
flush_dcache_page(page);
|
|
} else {
|
|
flush_dcache_page(page);
|
|
ret = btt_write_pg(btt, bip, sector, page, off, len);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static blk_qc_t btt_submit_bio(struct bio *bio)
|
|
{
|
|
struct bio_integrity_payload *bip = bio_integrity(bio);
|
|
struct btt *btt = bio->bi_bdev->bd_disk->private_data;
|
|
struct bvec_iter iter;
|
|
unsigned long start;
|
|
struct bio_vec bvec;
|
|
int err = 0;
|
|
bool do_acct;
|
|
|
|
if (!bio_integrity_prep(bio))
|
|
return BLK_QC_T_NONE;
|
|
|
|
do_acct = blk_queue_io_stat(bio->bi_bdev->bd_disk->queue);
|
|
if (do_acct)
|
|
start = bio_start_io_acct(bio);
|
|
bio_for_each_segment(bvec, bio, iter) {
|
|
unsigned int len = bvec.bv_len;
|
|
|
|
if (len > PAGE_SIZE || len < btt->sector_size ||
|
|
len % btt->sector_size) {
|
|
dev_err_ratelimited(&btt->nd_btt->dev,
|
|
"unaligned bio segment (len: %d)\n", len);
|
|
bio->bi_status = BLK_STS_IOERR;
|
|
break;
|
|
}
|
|
|
|
err = btt_do_bvec(btt, bip, bvec.bv_page, len, bvec.bv_offset,
|
|
bio_op(bio), iter.bi_sector);
|
|
if (err) {
|
|
dev_err(&btt->nd_btt->dev,
|
|
"io error in %s sector %lld, len %d,\n",
|
|
(op_is_write(bio_op(bio))) ? "WRITE" :
|
|
"READ",
|
|
(unsigned long long) iter.bi_sector, len);
|
|
bio->bi_status = errno_to_blk_status(err);
|
|
break;
|
|
}
|
|
}
|
|
if (do_acct)
|
|
bio_end_io_acct(bio, start);
|
|
|
|
bio_endio(bio);
|
|
return BLK_QC_T_NONE;
|
|
}
|
|
|
|
static int btt_rw_page(struct block_device *bdev, sector_t sector,
|
|
struct page *page, unsigned int op)
|
|
{
|
|
struct btt *btt = bdev->bd_disk->private_data;
|
|
int rc;
|
|
|
|
rc = btt_do_bvec(btt, NULL, page, thp_size(page), 0, op, sector);
|
|
if (rc == 0)
|
|
page_endio(page, op_is_write(op), 0);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo)
|
|
{
|
|
/* some standard values */
|
|
geo->heads = 1 << 6;
|
|
geo->sectors = 1 << 5;
|
|
geo->cylinders = get_capacity(bd->bd_disk) >> 11;
|
|
return 0;
|
|
}
|
|
|
|
static const struct block_device_operations btt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.submit_bio = btt_submit_bio,
|
|
.rw_page = btt_rw_page,
|
|
.getgeo = btt_getgeo,
|
|
};
|
|
|
|
static int btt_blk_init(struct btt *btt)
|
|
{
|
|
struct nd_btt *nd_btt = btt->nd_btt;
|
|
struct nd_namespace_common *ndns = nd_btt->ndns;
|
|
|
|
btt->btt_disk = blk_alloc_disk(NUMA_NO_NODE);
|
|
if (!btt->btt_disk)
|
|
return -ENOMEM;
|
|
|
|
nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name);
|
|
btt->btt_disk->first_minor = 0;
|
|
btt->btt_disk->fops = &btt_fops;
|
|
btt->btt_disk->private_data = btt;
|
|
|
|
blk_queue_logical_block_size(btt->btt_disk->queue, btt->sector_size);
|
|
blk_queue_max_hw_sectors(btt->btt_disk->queue, UINT_MAX);
|
|
blk_queue_flag_set(QUEUE_FLAG_NONROT, btt->btt_disk->queue);
|
|
|
|
if (btt_meta_size(btt)) {
|
|
int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));
|
|
|
|
if (rc) {
|
|
del_gendisk(btt->btt_disk);
|
|
blk_cleanup_disk(btt->btt_disk);
|
|
return rc;
|
|
}
|
|
}
|
|
set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);
|
|
device_add_disk(&btt->nd_btt->dev, btt->btt_disk, NULL);
|
|
btt->nd_btt->size = btt->nlba * (u64)btt->sector_size;
|
|
nvdimm_check_and_set_ro(btt->btt_disk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void btt_blk_cleanup(struct btt *btt)
|
|
{
|
|
del_gendisk(btt->btt_disk);
|
|
blk_cleanup_disk(btt->btt_disk);
|
|
}
|
|
|
|
/**
|
|
* btt_init - initialize a block translation table for the given device
|
|
* @nd_btt: device with BTT geometry and backing device info
|
|
* @rawsize: raw size in bytes of the backing device
|
|
* @lbasize: lba size of the backing device
|
|
* @uuid: A uuid for the backing device - this is stored on media
|
|
* @maxlane: maximum number of parallel requests the device can handle
|
|
*
|
|
* Initialize a Block Translation Table on a backing device to provide
|
|
* single sector power fail atomicity.
|
|
*
|
|
* Context:
|
|
* Might sleep.
|
|
*
|
|
* Returns:
|
|
* Pointer to a new struct btt on success, NULL on failure.
|
|
*/
|
|
static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize,
|
|
u32 lbasize, u8 *uuid, struct nd_region *nd_region)
|
|
{
|
|
int ret;
|
|
struct btt *btt;
|
|
struct nd_namespace_io *nsio;
|
|
struct device *dev = &nd_btt->dev;
|
|
|
|
btt = devm_kzalloc(dev, sizeof(struct btt), GFP_KERNEL);
|
|
if (!btt)
|
|
return NULL;
|
|
|
|
btt->nd_btt = nd_btt;
|
|
btt->rawsize = rawsize;
|
|
btt->lbasize = lbasize;
|
|
btt->sector_size = ((lbasize >= 4096) ? 4096 : 512);
|
|
INIT_LIST_HEAD(&btt->arena_list);
|
|
mutex_init(&btt->init_lock);
|
|
btt->nd_region = nd_region;
|
|
nsio = to_nd_namespace_io(&nd_btt->ndns->dev);
|
|
btt->phys_bb = &nsio->bb;
|
|
|
|
ret = discover_arenas(btt);
|
|
if (ret) {
|
|
dev_err(dev, "init: error in arena_discover: %d\n", ret);
|
|
return NULL;
|
|
}
|
|
|
|
if (btt->init_state != INIT_READY && nd_region->ro) {
|
|
dev_warn(dev, "%s is read-only, unable to init btt metadata\n",
|
|
dev_name(&nd_region->dev));
|
|
return NULL;
|
|
} else if (btt->init_state != INIT_READY) {
|
|
btt->num_arenas = (rawsize / ARENA_MAX_SIZE) +
|
|
((rawsize % ARENA_MAX_SIZE) ? 1 : 0);
|
|
dev_dbg(dev, "init: %d arenas for %llu rawsize\n",
|
|
btt->num_arenas, rawsize);
|
|
|
|
ret = create_arenas(btt);
|
|
if (ret) {
|
|
dev_info(dev, "init: create_arenas: %d\n", ret);
|
|
return NULL;
|
|
}
|
|
|
|
ret = btt_meta_init(btt);
|
|
if (ret) {
|
|
dev_err(dev, "init: error in meta_init: %d\n", ret);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
ret = btt_blk_init(btt);
|
|
if (ret) {
|
|
dev_err(dev, "init: error in blk_init: %d\n", ret);
|
|
return NULL;
|
|
}
|
|
|
|
btt_debugfs_init(btt);
|
|
|
|
return btt;
|
|
}
|
|
|
|
/**
|
|
* btt_fini - de-initialize a BTT
|
|
* @btt: the BTT handle that was generated by btt_init
|
|
*
|
|
* De-initialize a Block Translation Table on device removal
|
|
*
|
|
* Context:
|
|
* Might sleep.
|
|
*/
|
|
static void btt_fini(struct btt *btt)
|
|
{
|
|
if (btt) {
|
|
btt_blk_cleanup(btt);
|
|
free_arenas(btt);
|
|
debugfs_remove_recursive(btt->debugfs_dir);
|
|
}
|
|
}
|
|
|
|
int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns)
|
|
{
|
|
struct nd_btt *nd_btt = to_nd_btt(ndns->claim);
|
|
struct nd_region *nd_region;
|
|
struct btt_sb *btt_sb;
|
|
struct btt *btt;
|
|
size_t size, rawsize;
|
|
int rc;
|
|
|
|
if (!nd_btt->uuid || !nd_btt->ndns || !nd_btt->lbasize) {
|
|
dev_dbg(&nd_btt->dev, "incomplete btt configuration\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
btt_sb = devm_kzalloc(&nd_btt->dev, sizeof(*btt_sb), GFP_KERNEL);
|
|
if (!btt_sb)
|
|
return -ENOMEM;
|
|
|
|
size = nvdimm_namespace_capacity(ndns);
|
|
rc = devm_namespace_enable(&nd_btt->dev, ndns, size);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* If this returns < 0, that is ok as it just means there wasn't
|
|
* an existing BTT, and we're creating a new one. We still need to
|
|
* call this as we need the version dependent fields in nd_btt to be
|
|
* set correctly based on the holder class
|
|
*/
|
|
nd_btt_version(nd_btt, ndns, btt_sb);
|
|
|
|
rawsize = size - nd_btt->initial_offset;
|
|
if (rawsize < ARENA_MIN_SIZE) {
|
|
dev_dbg(&nd_btt->dev, "%s must be at least %ld bytes\n",
|
|
dev_name(&ndns->dev),
|
|
ARENA_MIN_SIZE + nd_btt->initial_offset);
|
|
return -ENXIO;
|
|
}
|
|
nd_region = to_nd_region(nd_btt->dev.parent);
|
|
btt = btt_init(nd_btt, rawsize, nd_btt->lbasize, nd_btt->uuid,
|
|
nd_region);
|
|
if (!btt)
|
|
return -ENOMEM;
|
|
nd_btt->btt = btt;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nvdimm_namespace_attach_btt);
|
|
|
|
int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt)
|
|
{
|
|
struct btt *btt = nd_btt->btt;
|
|
|
|
btt_fini(btt);
|
|
nd_btt->btt = NULL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nvdimm_namespace_detach_btt);
|
|
|
|
static int __init nd_btt_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
debugfs_root = debugfs_create_dir("btt", NULL);
|
|
if (IS_ERR_OR_NULL(debugfs_root))
|
|
rc = -ENXIO;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit nd_btt_exit(void)
|
|
{
|
|
debugfs_remove_recursive(debugfs_root);
|
|
}
|
|
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT);
|
|
MODULE_AUTHOR("Vishal Verma <vishal.l.verma@linux.intel.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
module_init(nd_btt_init);
|
|
module_exit(nd_btt_exit);
|