From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934221AbcBDNIc (ORCPT ); Thu, 4 Feb 2016 08:08:32 -0500 Received: from mail-wm0-f42.google.com ([74.125.82.42]:35100 "EHLO mail-wm0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933897AbcBDNI0 (ORCPT ); Thu, 4 Feb 2016 08:08:26 -0500 From: "=?UTF-8?q?Javier=20Gonz=C3=A1lez?=" X-Google-Original-From: =?UTF-8?q?Javier=20Gonz=C3=A1lez?= To: mb@lightnvm.io Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, =?UTF-8?q?Javier=20Gonz=C3=A1lez?= Subject: [RFC 1/4] lightnvm: precalculate controller write boundaries Date: Thu, 4 Feb 2016 14:08:16 +0100 Message-Id: <1454591299-30305-2-git-send-email-javier@javigon.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1454591299-30305-1-git-send-email-javier@javigon.com> References: <1454591299-30305-1-git-send-email-javier@javigon.com> 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 Flash controllers typically define flash pages as a collection of flash sectors of typically 4K. Moreover, flash controllers might program flash pages across several planes. This defines the write granurality at which flash can be programmed. This is different for each flash controller. In order to simplify calculations, and avoid repeating them in a per-I/O basis, this patch pre-calculates write granurality values as part of the device characteristics in the bring up. Signed-off-by: Javier González --- drivers/lightnvm/rrpc.c | 4 ++++ drivers/lightnvm/rrpc.h | 3 +++ 2 files changed, 7 insertions(+) diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c index 775bf6c2..8187bf3 100644 --- a/drivers/lightnvm/rrpc.c +++ b/drivers/lightnvm/rrpc.c @@ -1149,6 +1149,10 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end) if (!rrpc->luns) return -ENOMEM; + rrpc->min_write_pgs = dev->sec_per_pl * (dev->sec_size / PAGE_SIZE); + /* assume max_phys_sect % dev->min_write_pgs == 0 */ + rrpc->max_write_pgs = dev->ops->max_phys_sect; + /* 1:1 mapping */ for (i = 0; i < rrpc->nr_luns; i++) { struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i); diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h index 3989d65..868e91a 100644 --- a/drivers/lightnvm/rrpc.h +++ b/drivers/lightnvm/rrpc.h @@ -107,6 +107,9 @@ struct rrpc { unsigned long long nr_sects; unsigned long total_blocks; + int min_write_pgs; /* minimum amount of pages required by controller */ + int max_write_pgs; /* maximum amount of pages supported by controller */ + /* Write strategy variables. Move these into each for structure for each * strategy */ -- 2.1.4