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=-17.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 61680C433DB for ; Sun, 7 Feb 2021 16:03:43 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C5AC564DF6 for ; Sun, 7 Feb 2021 16:03:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C5AC564DF6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=TiBXtjqrFXklcYAuIjgHhadPmZq3Rqv5bRSGsLWZGww=; b=UOK9rERdCdtO1/Onz/r//rDmq 2RTIVFXXN6z7PzcY0ohv7W2yxvPaIy09+ImJlzHUAnjQPcqhxcoEYt5Cuob5UqQFOESoEHLC4ET9S /BceipOwzx3uNCiyCDHiyc1IqTyQ6aqj7oN/qdWFjoYxtCB4gvl36ujxvXrv+J2+GvA22qb3k3oQC hzxJ5aWeGgd2KpnmHV+eNiX6m1ywgOUzAreVk7UK2ewSwBQzes+H7FTVG6DgKmKVPC2+u9UMoxNv4 8E3Y2Pz2ueFZwQlCHKG58h8rP6vBlh8/bRb+SD7mmoI7tQuWxPrUPkxtEoLnJEF3C6+OvgM0lPoXl H3g9mHO/A==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l8mXA-0004ln-FW; Sun, 07 Feb 2021 16:03:36 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l8mX8-0004lQ-3A for linux-nvme@merlin.infradead.org; Sun, 07 Feb 2021 16:03:34 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=ADESUJp7a565Lae5zGNwqqhB0jXq9Sa1wQlflXitRbg=; b=Pl8pDGCPUk1YgPNWbatYEPi7RH ftl/7knjPldTFrJa+mk6PPgDEd0dR4CKIaD0UAE1PMuboCb4GpRvvqqfES4zMPSqIQpryItwN1XCA BXx7CgaL6vG+sO5Pb5x7SKIxbfQqX5UYgTRPn5p1oZz36YpeN3VIVJoc1YSYAmxmYl6XkQ6v/Bmh+ xrtc1sg876kjDn/CZ7FGnoyuAS0Gbb1mP00Z9J0tPHBHONavUp2YhqouC+1H5vhmfNzDSKhZYxUiD ICTf1R3cfQOr5VWJnljUkb8U4/yKKHRP5HXAiN54yPMG9gCt2YjiCQXJvG9xmh6mm+eEehvClLpi5 N/t28LVQ==; Received: from [2001:4bb8:184:7d04:4590:5583:6cb7:77c7] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l8mX6-004tN1-4A; Sun, 07 Feb 2021 16:03:32 +0000 From: Christoph Hellwig To: jxgao@google.com, gregkh@linuxfoundation.org Subject: [PATCH 1/9] driver core: add a min_align_mask field to struct device_dma_parameters Date: Sun, 7 Feb 2021 17:03:19 +0100 Message-Id: <20210207160327.2955490-2-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210207160327.2955490-1-hch@lst.de> References: <20210207160327.2955490-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: saravanak@google.com, konrad.wilk@oracle.com, marcorr@google.com, linux-nvme@lists.infradead.org, kbusch@kernel.org, iommu@lists.linux-foundation.org, erdemaktas@google.com, robin.murphy@arm.com, m.szyprowski@samsung.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: Jianxiong Gao Some devices rely on the address offset in a page to function correctly (NVMe driver as an example). These devices may use a different page size than the Linux kernel. The address offset has to be preserved upon mapping, and in order to do so, we need to record the page_offset_mask first. Signed-off-by: Jianxiong Gao Signed-off-by: Christoph Hellwig Acked-by: Greg Kroah-Hartman --- include/linux/device.h | 1 + include/linux/dma-mapping.h | 16 ++++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/device.h b/include/linux/device.h index 1779f90eeb4cb4..7960bf516dd7fe 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -291,6 +291,7 @@ struct device_dma_parameters { * sg limitations. */ unsigned int max_segment_size; + unsigned int min_align_mask; unsigned long segment_boundary_mask; }; diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 2e49996a8f391a..9c26225754e719 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -500,6 +500,22 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) return -EIO; } +static inline unsigned int dma_get_min_align_mask(struct device *dev) +{ + if (dev->dma_parms) + return dev->dma_parms->min_align_mask; + return 0; +} + +static inline int dma_set_min_align_mask(struct device *dev, + unsigned int min_align_mask) +{ + if (WARN_ON_ONCE(!dev->dma_parms)) + return -EIO; + dev->dma_parms->min_align_mask = min_align_mask; + return 0; +} + static inline int dma_get_cache_alignment(void) { #ifdef ARCH_DMA_MINALIGN -- 2.29.2 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme