From patchwork Mon Oct 26 10:58:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11856521 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 97F8F921 for ; Mon, 26 Oct 2020 10:59:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D74C222EA for ; Mon, 26 Oct 2020 10:59:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="KLr497mr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1772910AbgJZK7U (ORCPT ); Mon, 26 Oct 2020 06:59:20 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:46433 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1772825AbgJZK6n (ORCPT ); Mon, 26 Oct 2020 06:58:43 -0400 Received: by mail-wr1-f65.google.com with SMTP id n6so11856650wrm.13 for ; Mon, 26 Oct 2020 03:58:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5W4UqFTJMoDRzu7XpmV7m/mIx7tbXZK4TFNNVek8jNg=; b=KLr497mrTXuUWmZaofaXk1hyxgArLSK5Z8LFA7VwpBwSz2E3+nE1glgvLx0JiQdQzn dm5kaVp9H5reVf+JjmNdCZ0s9dozztPh2nQ4nrraI1YOy9mqE/zZOpL+5xkTYVff+uRk JdfMqSudDhC/KCWc2IX1OVFNm25KGK/VrwkWA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=5W4UqFTJMoDRzu7XpmV7m/mIx7tbXZK4TFNNVek8jNg=; b=VPGVTYdnxJtpwirjwng0TGYZo/8jGwxKvPLH62MEPA7JEjRM0YdnlfCzWknT0KDnLW 0vdRuekhp/1KgaISIj6iBqP/nPZKG9tCQxueM3x+mXMB06v/BT38g4YKQd4TnT/Gs8k/ w+zNjUaFdOoWcGLy3CCVladdqKh8TcPJV9B6oTl/eDCBtjnsCX4jel4vUJ9CYqmdKzTM HSA9kL0Z8MdVzN1aVt9k5iAhmZOFOV07PTLm/tKnKb/FjAUSpZle+6Hi4gbNIS9MdZVr X5qccoOqrAdIuqrJnvMOiBL/M20dX5oivqO/taBt5CiVM30Cn+2sefT5P5atimDI5wJh 4zig== X-Gm-Message-State: AOAM532+WeQAnKrfJih8RQye46AqyETZBy8FAqXoglbcUROJbk1//yeI wYzuOWK/n8df5mVKHQKz5D8kQw== X-Google-Smtp-Source: ABdhPJz2su0SrOVqm3DeypSb7RJN8qc1fEsNaBh1v2aKMDuErJYYfZ5yJi5C/1uI817lBc+Ai9qYTQ== X-Received: by 2002:adf:f3cb:: with SMTP id g11mr18177850wrp.210.1603709921142; Mon, 26 Oct 2020 03:58:41 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id w83sm21165156wmg.48.2020.10.26.03.58.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Oct 2020 03:58:40 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Bjorn Helgaas , linux-pci@vger.kernel.org Subject: [PATCH v4 11/15] PCI: Obey iomem restrictions for procfs mmap Date: Mon, 26 Oct 2020 11:58:14 +0100 Message-Id: <20201026105818.2585306-12-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201026105818.2585306-1-daniel.vetter@ffwll.ch> References: <20201026105818.2585306-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org There's three ways to access PCI BARs from userspace: /dev/mem, sysfs files, and the old proc interface. Two check against iomem_is_exclusive, proc never did. And with CONFIG_IO_STRICT_DEVMEM, this starts to matter, since we don't want random userspace having access to PCI BARs while a driver is loaded and using it. Fix this by adding the same iomem_is_exclusive() check we already have on the sysfs side in pci_mmap_resource(). References: 90a545e98126 ("restrict /dev/mem to idle io memory ranges") Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: Improve commit message (Bjorn) --- drivers/pci/proc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index d35186b01d98..3a2f90beb4cb 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -274,6 +274,11 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) else return -EINVAL; } + + if (dev->resource[i].flags & IORESOURCE_MEM && + iomem_is_exclusive(dev->resource[i].start)) + return -EINVAL; + ret = pci_mmap_page_range(dev, i, vma, fpriv->mmap_state, write_combine); if (ret < 0) From patchwork Mon Oct 26 10:58:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11856465 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 9DBEA14C0 for ; Mon, 26 Oct 2020 10:58:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7B55C2242C for ; Mon, 26 Oct 2020 10:58:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="AyLC83NY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1772860AbgJZK6t (ORCPT ); Mon, 26 Oct 2020 06:58:49 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:54883 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1772848AbgJZK6r (ORCPT ); Mon, 26 Oct 2020 06:58:47 -0400 Received: by mail-wm1-f67.google.com with SMTP id w23so10050865wmi.4 for ; Mon, 26 Oct 2020 03:58:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=kkmJ6ZmKgmcd6yJ6bv+WDWEfAJ+atBjrBRrq3Oi6xEA=; b=AyLC83NYGpnIvuLIFq1n+EYb5RD2pj+8NwDHlA6VA5HNxtYkzMI28Z+nvka4pfH0sh 7KSsyqM99nYdq6/YaTlJmbbjYh4uyOjgl1qj0NJ0XKlEnX0r9gulONO+zSqW5ASovylx roszmSmlQTJoMIlY94WrJZfxbZNLo6JFHhNE0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=kkmJ6ZmKgmcd6yJ6bv+WDWEfAJ+atBjrBRrq3Oi6xEA=; b=LiwTDnnAkVasYOFqE0VNeUiGMpCH7A8LUF5eJEbO8HQK/6JLJ8Bw+Dqu792po8Siop WBbjmBd8THYcw4/nBX3pepg8yPQQDJp94fM70SRF3UaNayAoUWPXvBBGwwWD/jXPD855 FEiXTxT4hls288CQ2Lrhf/nC46SGg63WUaeEnDMAkPop7aegsi6ETlDCJvUWCfMZ/Jxf aPEpK2Nz6VOlgxMYYygutPz0Al6364mF1fnWxsirHXXGmVfhHNiuXq1Y3jE6Y29pkxH4 WVYmg/bcPvbeGPWHfxbviV2ZPizlZ1d//3KSq5ymEtKmaECneGjTuEGJWyJTfc+xabOs PjSA== X-Gm-Message-State: AOAM531d0tnOL+NVbRVn6+mGGvqHGSUZ5ENlH2Adi9y1ju46yMvCNTxd /NGO4pf6W1Wnu/UtdggZ9011Ng== X-Google-Smtp-Source: ABdhPJytw73HXFA7BGESL3jqxl9OmapvxqxjO7CWItldlXvB0eWL3Kk5ZZkwwQloESg/WFGowlh1eg== X-Received: by 2002:a1c:4306:: with SMTP id q6mr16417557wma.189.1603709925752; Mon, 26 Oct 2020 03:58:45 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id w83sm21165156wmg.48.2020.10.26.03.58.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Oct 2020 03:58:45 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Greg Kroah-Hartman , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Bjorn Helgaas , linux-pci@vger.kernel.org, "Rafael J. Wysocki" , Christian Brauner , "David S. Miller" , Michael Ellerman , Sourabh Jain , Mauro Carvalho Chehab , Nayna Jain Subject: [PATCH v4 14/15] sysfs: Support zapping of binary attr mmaps Date: Mon, 26 Oct 2020 11:58:17 +0100 Message-Id: <20201026105818.2585306-15-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201026105818.2585306-1-daniel.vetter@ffwll.ch> References: <20201026105818.2585306-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org We want to be able to revoke pci mmaps so that the same access rules applies as for /dev/kmem. Revoke support for devmem was added in 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the region"). The simplest way to achieve this is by having the same filp->f_mapping for all mappings, so that unmap_mapping_range can find them all, no matter through which file they've been created. Since this must be set at open time we need sysfs support for this. Add an optional mapping parameter bin_attr, which is only consulted when there's also an mmap callback, since without mmap support allowing to adjust the ->f_mapping makes no sense. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Cc: Christian Brauner Cc: "David S. Miller" Cc: Michael Ellerman Cc: Sourabh Jain Cc: Daniel Vetter Cc: Mauro Carvalho Chehab Cc: Nayna Jain Signed-off-by: Daniel Vetter --- fs/sysfs/file.c | 11 +++++++++++ include/linux/sysfs.h | 2 ++ 2 files changed, 13 insertions(+) diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index eb6897ab78e7..9d8ccdb000e3 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -169,6 +169,16 @@ static int sysfs_kf_bin_mmap(struct kernfs_open_file *of, return battr->mmap(of->file, kobj, battr, vma); } +static int sysfs_kf_bin_open(struct kernfs_open_file *of) +{ + struct bin_attribute *battr = of->kn->priv; + + if (battr->mapping) + of->file->f_mapping = battr->mapping; + + return 0; +} + void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr) { struct kernfs_node *kn = kobj->sd, *tmp; @@ -240,6 +250,7 @@ static const struct kernfs_ops sysfs_bin_kfops_mmap = { .read = sysfs_kf_bin_read, .write = sysfs_kf_bin_write, .mmap = sysfs_kf_bin_mmap, + .open = sysfs_kf_bin_open, }; int sysfs_add_file_mode_ns(struct kernfs_node *parent, diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 34e84122f635..a17a474d1601 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -164,11 +164,13 @@ __ATTRIBUTE_GROUPS(_name) struct file; struct vm_area_struct; +struct address_space; struct bin_attribute { struct attribute attr; size_t size; void *private; + struct address_space *mapping; ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *, char *, loff_t, size_t); ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *, From patchwork Mon Oct 26 10:58:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11856473 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 0D55F92C for ; Mon, 26 Oct 2020 10:58:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE7FC238E6 for ; Mon, 26 Oct 2020 10:58:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="RdtN9nvq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1772856AbgJZK6v (ORCPT ); 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b=r+fjXPsn6rXLFjFo6pPrho8xG6gWa78Qw0yZHbB90ahMrzwX5604ipG4QdkBYDZ1oG 3KPVrAUHZHLW9wm3z/7cexLA0DPq1FYlI05cklAZZn25Q2ZenSr/316wluQJgSJuzXsn ceDQujm1U803rMnjACJJ0ATeKvl+vPxjHd+CEnSv063Tl2yy4/WoDgoo8fmviNBawf0K 5W7hj7DmY1DWNHc2ffQT5RL7zXFesChVPlYKBmLuaWvtS4a0zX4e5kr+cA2GyuOcXgO/ DFM4Y8EhsMRPhoFl707J4nE++3r547iBcWU2Uch8N+3MoMH1OPjvVNJP5KtBef5BzM8E ZaZA== X-Gm-Message-State: AOAM531zA6Mjam09hgMmWA9ptR62mJ8/tMg7mKsxPnuKPArM7z9rxtIm BeAMLyfqWL37uWsM9PQVIIScig== X-Google-Smtp-Source: ABdhPJyJEgobhpYPgpR3deeCaVtbSbKMyoksav28TvwMmYamt9hp5XzgBWl2um1YOhVBMyiCN8BNmg== X-Received: by 2002:a5d:498a:: with SMTP id r10mr17440576wrq.106.1603709927066; Mon, 26 Oct 2020 03:58:47 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id w83sm21165156wmg.48.2020.10.26.03.58.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Oct 2020 03:58:46 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Greg Kroah-Hartman , Bjorn Helgaas , linux-pci@vger.kernel.org Subject: [PATCH v4 15/15] PCI: Revoke mappings like devmem Date: Mon, 26 Oct 2020 11:58:18 +0100 Message-Id: <20201026105818.2585306-16-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201026105818.2585306-1-daniel.vetter@ffwll.ch> References: <20201026105818.2585306-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the region") /dev/kmem zaps ptes when the kernel requests exclusive acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is the default for all driver uses. Except there's two more ways to access PCI BARs: sysfs and proc mmap support. Let's plug that hole. For revoke_devmem() to work we need to link our vma into the same address_space, with consistent vma->vm_pgoff. ->pgoff is already adjusted, because that's how (io_)remap_pfn_range works, but for the mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is to adjust this at at ->open time: - for sysfs this is easy, now that binary attributes support this. We just set bin_attr->mapping when mmap is supported - for procfs it's a bit more tricky, since procfs pci access has only one file per device, and access to a specific resources first needs to be set up with some ioctl calls. But mmap is only supported for the same resources as sysfs exposes with mmap support, and otherwise rejected, so we can set the mapping unconditionally at open time without harm. A special consideration is for arch_can_pci_mmap_io() - we need to make sure that the ->f_mapping doesn't alias between ioport and iomem space. There's only 2 ways in-tree to support mmap of ioports: generic pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single architecture hand-rolling. Both approach support ioport mmap through a special pfn range and not through magic pte attributes. Aliasing is therefore not a problem. The only difference in access checks left is that sysfs PCI mmap does not check for CAP_RAWIO. I'm not really sure whether that should be added or not. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: Greg Kroah-Hartman Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: - Totally new approach: Adjust filp->f_mapping at open time. Note that this now works on all architectures, not just those support ARCH_GENERIC_PCI_MMAP_RESOURCE --- drivers/pci/pci-sysfs.c | 4 ++++ drivers/pci/proc.c | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 6d78df981d41..cee38fcb4a86 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -928,6 +928,7 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_io->read = pci_read_legacy_io; b->legacy_io->write = pci_write_legacy_io; b->legacy_io->mmap = pci_mmap_legacy_io; + b->legacy_io->mapping = iomem_get_mapping(); pci_adjust_legacy_attr(b, pci_mmap_io); error = device_create_bin_file(&b->dev, b->legacy_io); if (error) @@ -940,6 +941,7 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_mem->size = 1024*1024; b->legacy_mem->attr.mode = 0600; b->legacy_mem->mmap = pci_mmap_legacy_mem; + b->legacy_io->mapping = iomem_get_mapping(); pci_adjust_legacy_attr(b, pci_mmap_mem); error = device_create_bin_file(&b->dev, b->legacy_mem); if (error) @@ -1155,6 +1157,8 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) res_attr->mmap = pci_mmap_resource_uc; } } + if (res_attr->mmap) + res_attr->mapping = iomem_get_mapping(); res_attr->attr.name = res_attr_name; res_attr->attr.mode = 0600; res_attr->size = pci_resource_len(pdev, num); diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index 3a2f90beb4cb..9bab07302bbf 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -298,6 +298,7 @@ static int proc_bus_pci_open(struct inode *inode, struct file *file) fpriv->write_combine = 0; file->private_data = fpriv; + file->f_mapping = iomem_get_mapping(); return 0; }