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

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

drivers/pci/mmap.c

+8 −4
Original line number Diff line number Diff line
@@ -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);



	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,

include/linux/pci.h

+4 −0
Original line number Diff line number Diff line
@@ -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