From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752408AbdECP6P (ORCPT ); Wed, 3 May 2017 11:58:15 -0400 Received: from foss.arm.com ([217.140.101.70]:58342 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751177AbdECP6H (ORCPT ); Wed, 3 May 2017 11:58:07 -0400 Date: Wed, 3 May 2017 16:58:58 +0100 From: Lorenzo Pieralisi To: Bharat Bhushan Cc: catalin.marinas@arm.com, will.deacon@arm.com, bhelgaas@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ARM64/PCI: Allow userspace to mmap PCI resources Message-ID: <20170503155858.GA11986@red-moon> References: <1493826538-23785-1-git-send-email-Bharat.Bhushan@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1493826538-23785-1-git-send-email-Bharat.Bhushan@nxp.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 03, 2017 at 09:18:58PM +0530, Bharat Bhushan wrote: > This patch allows user-space to mmap PCI resources. This > patch is inline to arm32 bit implementation. > > Signed-off-by: Bharat Bhushan > --- > arch/arm64/include/asm/pci.h | 4 ++++ > arch/arm64/kernel/pci.c | 19 +++++++++++++++++++ > 2 files changed, 23 insertions(+) https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/arm64/include/asm/pci.h?id=f719582435afe9c7985206e42d804ea6aa315d33 > > diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h > index b9a7ba9..8a18915 100644 > --- a/arch/arm64/include/asm/pci.h > +++ b/arch/arm64/include/asm/pci.h > @@ -31,6 +31,10 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel) > return -ENODEV; > } > > +#define HAVE_PCI_MMAP > +extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, > + enum pci_mmap_state mmap_state, > + int write_combine); > static inline int pci_proc_domain(struct pci_bus *bus) > { > return 1; > diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c > index ce20f4c..2e45a83 100644 > --- a/arch/arm64/kernel/pci.c > +++ b/arch/arm64/kernel/pci.c > @@ -97,6 +97,25 @@ int pcibios_check_service_irqs(struct pci_dev *dev, int *irqs, int mask) > return count; > } > > +int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, > + enum pci_mmap_state mmap_state, int write_combine) > +{ > + if (mmap_state == pci_mmap_io) > + return -EINVAL; > + > + /* > + * Mark this as IO > + */ > + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); > + > + if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, > + vma->vm_end - vma->vm_start, > + vma->vm_page_prot)) > + return -EAGAIN; > + > + return 0; > +} > + > /* > * raw_pci_read/write - Platform-specific PCI config space access. > */ > -- > 1.9.3 >