From patchwork Fri Feb 7 20:26:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Goyal X-Patchwork-Id: 11371223 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3035C18E8 for ; Fri, 7 Feb 2020 20:27:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0E618222C2 for ; Fri, 7 Feb 2020 20:27:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="e19OyZhO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727129AbgBGU1N (ORCPT ); Fri, 7 Feb 2020 15:27:13 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:44044 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727032AbgBGU1K (ORCPT ); Fri, 7 Feb 2020 15:27:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581107229; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8foEyay8+OOzaGQuCRaBURtgFdqxdF17uA4H4O9cpZo=; b=e19OyZhOgR4XkvTXMOY16420lpgdcni7hM7ixVlLsiRP7cTNP/wirzgU3cX0IOzjPu1BQE C/8vKYgVXrmePe+qUew6gRMBW79ei9OJz9VZ/vbuV1viLzP1tLsrKQvItHNsbpqzB88QbA Gv6srX44qgAf1mMfa96vVrFVv2K/qwU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-310-fzC9EGLuMAyyP2LKicSqnQ-1; Fri, 07 Feb 2020 15:27:06 -0500 X-MC-Unique: fzC9EGLuMAyyP2LKicSqnQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C4758801E74; Fri, 7 Feb 2020 20:27:05 +0000 (UTC) Received: from horse.redhat.com (unknown [10.18.25.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id 057545DA7E; Fri, 7 Feb 2020 20:27:03 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 8E3172257D3; Fri, 7 Feb 2020 15:27:02 -0500 (EST) From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org, hch@infradead.org, dan.j.williams@intel.com Cc: dm-devel@redhat.com, vishal.l.verma@intel.com, vgoyal@redhat.com Subject: [PATCH v3 1/7] pmem: Add functions for reading/writing page to/from pmem Date: Fri, 7 Feb 2020 15:26:46 -0500 Message-Id: <20200207202652.1439-2-vgoyal@redhat.com> In-Reply-To: <20200207202652.1439-1-vgoyal@redhat.com> References: <20200207202652.1439-1-vgoyal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This splits pmem_do_bvec() into pmem_do_read() and pmem_do_write(). pmem_do_write() will be used by pmem zero_page_range() as well. Hence sharing the same code. Suggested-by: Christoph Hellwig Signed-off-by: Vivek Goyal --- drivers/nvdimm/pmem.c | 79 ++++++++++++++++++++++++++----------------- 1 file changed, 48 insertions(+), 31 deletions(-) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index ad8e4df1282b..9ad07cb8c9fc 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -136,9 +136,25 @@ static blk_status_t read_pmem(struct page *page, unsigned int off, return BLK_STS_OK; } -static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page, - unsigned int len, unsigned int off, unsigned int op, - sector_t sector) +static blk_status_t pmem_do_read(struct pmem_device *pmem, + struct page *page, unsigned int page_off, + sector_t sector, unsigned int len) +{ + blk_status_t rc; + phys_addr_t pmem_off = sector * 512 + pmem->data_offset; + void *pmem_addr = pmem->virt_addr + pmem_off; + + if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) + return BLK_STS_IOERR; + + rc = read_pmem(page, page_off, pmem_addr, len); + flush_dcache_page(page); + return rc; +} + +static blk_status_t pmem_do_write(struct pmem_device *pmem, + struct page *page, unsigned int page_off, + sector_t sector, unsigned int len) { blk_status_t rc = BLK_STS_OK; bool bad_pmem = false; @@ -148,39 +164,40 @@ static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page, if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) bad_pmem = true; - if (!op_is_write(op)) { - if (unlikely(bad_pmem)) - rc = BLK_STS_IOERR; - else { - rc = read_pmem(page, off, pmem_addr, len); - flush_dcache_page(page); - } - } else { - /* - * Note that we write the data both before and after - * clearing poison. The write before clear poison - * handles situations where the latest written data is - * preserved and the clear poison operation simply marks - * the address range as valid without changing the data. - * In this case application software can assume that an - * interrupted write will either return the new good - * data or an error. - * - * However, if pmem_clear_poison() leaves the data in an - * indeterminate state we need to perform the write - * after clear poison. - */ - flush_dcache_page(page); - write_pmem(pmem_addr, page, off, len); - if (unlikely(bad_pmem)) { - rc = pmem_clear_poison(pmem, pmem_off, len); - write_pmem(pmem_addr, page, off, len); - } + /* + * Note that we write the data both before and after + * clearing poison. The write before clear poison + * handles situations where the latest written data is + * preserved and the clear poison operation simply marks + * the address range as valid without changing the data. + * In this case application software can assume that an + * interrupted write will either return the new good + * data or an error. + * + * However, if pmem_clear_poison() leaves the data in an + * indeterminate state we need to perform the write + * after clear poison. + */ + flush_dcache_page(page); + write_pmem(pmem_addr, page, page_off, len); + if (unlikely(bad_pmem)) { + rc = pmem_clear_poison(pmem, pmem_off, len); + write_pmem(pmem_addr, page, page_off, len); } return rc; } +static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page, + unsigned int len, unsigned int off, unsigned int op, + sector_t sector) +{ + if (!op_is_write(op)) + return pmem_do_read(pmem, page, off, sector, len); + + return pmem_do_write(pmem, page, off, sector, len); +} + static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) { int ret = 0;