> -----Original Message----- > From: Lorenzo Pieralisi [mailto:lorenzo.pieral...@arm.com] > Sent: Wednesday, May 03, 2017 9:29 PM > To: Bharat Bhushan <bharat.bhus...@nxp.com> > Cc: catalin.mari...@arm.com; will.dea...@arm.com; > bhelg...@google.com; linux-arm-ker...@lists.infradead.org; linux- > ker...@vger.kernel.org > Subject: Re: [PATCH] ARM64/PCI: Allow userspace to mmap PCI resources > > 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 <bharat.bhus...@nxp.com> > > --- > > 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=f719582435afe9c7985206 > e42d804ea6aa315d33
Oh, I missed this patch series, Thanks -Bharat > > > > > 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 > >