| Message ID | 1493826538-23785-1-git-send-email-Bharat.Bhushan@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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 >
> -----Original Message----- > From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@arm.com] > Sent: Wednesday, May 03, 2017 9:29 PM > To: Bharat Bhushan <bharat.bhushan@nxp.com> > 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 > > 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=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 > >
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. */
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(+)