Commit 2bea36fd authored by David Woodhouse's avatar David Woodhouse Committed by Bjorn Helgaas

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: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 5c2d5ce2
......@@ -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,
......
......@@ -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
......
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