From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD7C7C4727F for ; Tue, 29 Sep 2020 11:49:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 93CCA21924 for ; Tue, 29 Sep 2020 11:49:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601380155; bh=1gAGrbXkitidD3g7ye9RQkSH/Sy+fK3BMcHRDM4xKXc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rJFpGcGi39vX0npyJEOfK5sjrPGZ0K5RMuliYyNpvGlHBXIngHjNhqTAW1KwnmY36 QtkolTF5ogHgdw2VuEkcA2uneqmY9NCEV9hUR5GwaIhyK5d46J6EWV865XVbsJeY32 bYlQ/8gfOS1cqOJ39cj2rF91VP7xtlvSUaFCfbLs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731032AbgI2LtO (ORCPT ); Tue, 29 Sep 2020 07:49:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:51668 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731144AbgI2Lsw (ORCPT ); Tue, 29 Sep 2020 07:48:52 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BB59F208B8; Tue, 29 Sep 2020 11:48:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601380129; bh=1gAGrbXkitidD3g7ye9RQkSH/Sy+fK3BMcHRDM4xKXc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BvlAkDHc7vyoEX11glmGgYiTGlvIWPXneV6STvCh0vwwdxPxcc8a8V4XXwgbbbMiI cLhMeiQoCZE4efO6M2K1iMiHJmxVx6VPqDkM1tdRVMk6xhyS0xDc5k4u96X+VhKd3I iojXQcZIGXVRr0S6H0Et9uDiITvMOevV16c1TfIg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Jan=20H=C3=B6ppner?= , Stefan Haberland , Jens Axboe Subject: [PATCH 5.8 80/99] s390/dasd: Fix zero write for FBA devices Date: Tue, 29 Sep 2020 13:02:03 +0200 Message-Id: <20200929105933.668733109@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200929105929.719230296@linuxfoundation.org> References: <20200929105929.719230296@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jan Höppner commit 709192d531e5b0a91f20aa14abfe2fc27ddd47af upstream. A discard request that writes zeros using the global kernel internal ZERO_PAGE will fail for machines with more than 2GB of memory due to the location of the ZERO_PAGE. Fix this by using a driver owned global zero page allocated with GFP_DMA flag set. Fixes: 28b841b3a7cb ("s390/dasd: Add discard support for FBA devices") Signed-off-by: Jan Höppner Reviewed-by: Stefan Haberland Cc: # 4.14+ Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- drivers/s390/block/dasd_fba.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/drivers/s390/block/dasd_fba.c +++ b/drivers/s390/block/dasd_fba.c @@ -40,6 +40,7 @@ MODULE_LICENSE("GPL"); static struct dasd_discipline dasd_fba_discipline; +static void *dasd_fba_zero_page; struct dasd_fba_private { struct dasd_fba_characteristics rdc_data; @@ -270,7 +271,7 @@ static void ccw_write_zero(struct ccw1 * ccw->cmd_code = DASD_FBA_CCW_WRITE; ccw->flags |= CCW_FLAG_SLI; ccw->count = count; - ccw->cda = (__u32) (addr_t) page_to_phys(ZERO_PAGE(0)); + ccw->cda = (__u32) (addr_t) dasd_fba_zero_page; } /* @@ -830,6 +831,11 @@ dasd_fba_init(void) int ret; ASCEBC(dasd_fba_discipline.ebcname, 4); + + dasd_fba_zero_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!dasd_fba_zero_page) + return -ENOMEM; + ret = ccw_driver_register(&dasd_fba_driver); if (!ret) wait_for_device_probe(); @@ -841,6 +847,7 @@ static void __exit dasd_fba_cleanup(void) { ccw_driver_unregister(&dasd_fba_driver); + free_page((unsigned long)dasd_fba_zero_page); } module_init(dasd_fba_init);