PCI: Add I/O BAR support to generic pci_mmap_resource_range()

This will need to call into an arch-provided pci_iobar_pfn() function.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/mmap.c b/drivers/pci/mmap.c
index b7aca9c..9a5e5a9 100644 (file)
--- a/drivers/pci/mmap.c
+++ b/drivers/pci/mmap.c
@@ -48,9 +48,7 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
                            enum pci_mmap_state mmap_state, int write_combine)
 {
        unsigned long size;
-
-       if (mmap_state == pci_mmap_io)
-               return -EINVAL;
+       int ret;
 
        size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
        if (vma->vm_pgoff + vma_pages(vma) > size)
@@ -61,7 +59,13 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
        else
                vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
 
-       vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT);
+       if (mmap_state == pci_mmap_io) {
+               ret = pci_iobar_pfn(pdev, bar, vma);
+               if (ret)
+                       return ret;
+       } else
+               vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT);
+
        vma->vm_ops = &pci_phys_vm_ops;
 
        return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 98a72ab..9f30244 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1648,8 +1648,12 @@ int pci_mmap_page_range(struct pci_dev *pdev, int bar,
 #ifndef arch_can_pci_mmap_wc
 #define arch_can_pci_mmap_wc()         0
 #endif
+
 #ifndef arch_can_pci_mmap_io
 #define arch_can_pci_mmap_io()         0
+#define pci_iobar_pfn(pdev, bar, vma) (-EINVAL)
+#else
+int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma);
 #endif
 
 #ifndef pci_root_bus_fwnode