Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752440AbcDZKcc (ORCPT ); Tue, 26 Apr 2016 06:32:32 -0400 Received: from mail-wm0-f50.google.com ([74.125.82.50]:37631 "EHLO mail-wm0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751814AbcDZKbZ (ORCPT ); Tue, 26 Apr 2016 06:31:25 -0400 From: =?UTF-8?q?Matias=20Bj=C3=B8rling?= To: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Matias=20Bj=C3=B8rling?= Subject: [PATCH 1/5] lightnvm: introduce nvm_for_each_lun_ppa() macro Date: Tue, 26 Apr 2016 12:31:06 +0200 Message-Id: <1461666670-30996-2-git-send-email-m@bjorling.me> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1461666670-30996-1-git-send-email-m@bjorling.me> References: <1461666670-30996-1-git-send-email-m@bjorling.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3341 Lines: 113 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 --- drivers/lightnvm/sysblk.c | 56 +++++++++++++++++++---------------------------- include/linux/lightnvm.h | 7 ++++++ 2 files changed, 29 insertions(+), 34 deletions(-) diff --git a/drivers/lightnvm/sysblk.c b/drivers/lightnvm/sysblk.c index 7fce588..a48093d 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]; + 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); + 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); + 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; + erase_list[ppa_cnt] = ppa; + ppa_cnt++; + done = 0; - if (ppa_cnt == max_ppas) - return ppa_cnt; - } + 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 5eabdba..3f25635 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; -- 2.1.4