Messages in this thread | | | Date | Wed, 3 May 2017 16:58:58 +0100 | From | Lorenzo Pieralisi <> | Subject | Re: [PATCH] ARM64/PCI: Allow userspace to mmap PCI resources |
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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.Bhushan@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=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 >
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