[PATCH] ARM64/PCI: Allow userspace to mmap PCI resources

[Bharat Bhushan]

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(+)

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