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Subject[PATCH v2 19/27] pci: Add I/O BAR support to generic pci_mmap_resource_range()
Date
From: David Woodhouse <dwmw@amazon.co.uk>

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

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
drivers/pci/mmap.c | 11 +++++++----
include/linux/pci.h | 4 ++++
2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/mmap.c b/drivers/pci/mmap.c
index 9ba720b..16e1d70 100644
--- a/drivers/pci/mmap.c
+++ b/drivers/pci/mmap.c
@@ -45,9 +45,6 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
{
unsigned long size;

- if (mmap_state == pci_mmap_io)
- return -EINVAL;
-
size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
if (vma->vm_pgoff + vma_pages(vma) > size)
return -EINVAL;
@@ -57,7 +54,13 @@ 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) {
+ int 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 ff1c818..0d40ddd 100644
--- 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
--
2.9.3
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