From 5136061ce705210b501ed9ecd673a67b74ebe017 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Matias=20Bj=C3=B8rling?= Date: Fri, 6 May 2016 20:03:04 +0200 Subject: [PATCH] lightnvm: introduce nvm_for_each_lun_ppa() macro MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Users that wish to iterate all luns on a device. Must create a struct ppa_addr and separate iterators for channels and luns. To set the iterators, two loops are required, one to iterate channels, and another to iterate luns. This leads to decrease in readability. Introduce nvm_for_each_lun_ppa, which implements the nested loop and sets ppa, channel, and lun variable for each loop body, eliminating the boilerplate code. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/sysblk.c | 64 ++++++++++++++++----------------------- include/linux/lightnvm.h | 7 +++++ 2 files changed, 33 insertions(+), 38 deletions(-) diff --git a/drivers/lightnvm/sysblk.c b/drivers/lightnvm/sysblk.c index 7fce58833a07..a48093d17fea 100644 --- a/drivers/lightnvm/sysblk.c +++ b/drivers/lightnvm/sysblk.c @@ -631,33 +631,28 @@ static int nvm_fact_get_blks(struct nvm_dev *dev, struct ppa_addr *erase_list, while (!done) { done = 1; - for (ch = 0; ch < dev->nr_chnls; ch++) { - for (lun = 0; lun < dev->luns_per_chnl; lun++) { - idx = factory_blk_offset(dev, ch, lun); - offset = &f->blks[idx]; - - blkid = find_first_zero_bit(offset, - dev->blks_per_lun); - if (blkid >= dev->blks_per_lun) - continue; - set_bit(blkid, offset); - - ppa.ppa = 0; - ppa.g.ch = ch; - ppa.g.lun = lun; - ppa.g.blk = blkid; - pr_debug("nvm: erase ppa (%u %u %u)\n", - ppa.g.ch, - ppa.g.lun, - ppa.g.blk); - - erase_list[ppa_cnt] = ppa; - ppa_cnt++; - done = 0; - - if (ppa_cnt == max_ppas) - return ppa_cnt; - } + nvm_for_each_lun_ppa(dev, ppa, ch, lun) { + idx = factory_blk_offset(dev, ch, lun); + offset = &f->blks[idx]; + + blkid = find_first_zero_bit(offset, + dev->blks_per_lun); + if (blkid >= dev->blks_per_lun) + continue; + set_bit(blkid, offset); + + ppa.g.blk = blkid; + pr_debug("nvm: erase ppa (%u %u %u)\n", + ppa.g.ch, + ppa.g.lun, + ppa.g.blk); + + erase_list[ppa_cnt] = ppa; + ppa_cnt++; + done = 0; + + if (ppa_cnt == max_ppas) + return ppa_cnt; } } @@ -684,17 +679,10 @@ static int nvm_fact_select_blks(struct nvm_dev *dev, struct factory_blks *f) int ch, lun, ret; struct ppa_addr ppa; - ppa.ppa = 0; - for (ch = 0; ch < dev->nr_chnls; ch++) { - for (lun = 0; lun < dev->luns_per_chnl; lun++) { - ppa.g.ch = ch; - ppa.g.lun = lun; - - ret = nvm_fact_get_bb_tbl(dev, ppa, nvm_factory_blks, - f); - if (ret) - return ret; - } + nvm_for_each_lun_ppa(dev, ppa, ch, lun) { + ret = nvm_fact_get_bb_tbl(dev, ppa, nvm_factory_blks, f); + if (ret) + return ret; } return 0; diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h index 5eabdbaa87bc..3f256355b9fa 100644 --- a/include/linux/lightnvm.h +++ b/include/linux/lightnvm.h @@ -559,6 +559,13 @@ extern int nvm_update_sysblock(struct nvm_dev *, struct nvm_sb_info *); extern int nvm_init_sysblock(struct nvm_dev *, struct nvm_sb_info *); extern int nvm_dev_factory(struct nvm_dev *, int flags); + +#define nvm_for_each_lun_ppa(dev, ppa, chid, lunid) \ + for ((chid) = 0, (ppa).ppa = 0; (chid) < (dev)->nr_chnls; \ + (chid)++, (ppa).g.ch = (chid)) \ + for ((lunid) = 0; (lunid) < (dev)->luns_per_chnl; \ + (lunid)++, (ppa).g.lun = (lunid)) + #else /* CONFIG_NVM */ struct nvm_dev_ops; -- 2.20.1