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Subject[PATCH] ARM64/PCI: Allow userspace to mmap PCI resources
Date
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(+)

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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