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

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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>
This commit is contained in:
David Woodhouse 2017-04-12 13:26:08 +01:00 committed by Bjorn Helgaas
parent 5c2d5ce2ab
commit 2bea36fd1a
2 changed files with 12 additions and 4 deletions
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12
drivers/pci/mmap.c
View File

@ -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,

4
include/linux/pci.h
View File

@ -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