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-rw-r--r--drivers/pci/mmap.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/pci/mmap.c b/drivers/pci/mmap.c
index 4504039056..8da3347a95 100644
--- a/drivers/pci/mmap.c
+++ b/drivers/pci/mmap.c
@@ -11,6 +11,8 @@
#include <linux/mm.h>
#include <linux/pci.h>
+#include "pci.h"
+
#ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE
static const struct vm_operations_struct pci_phys_vm_ops = {
@@ -50,3 +52,30 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
}
#endif
+
+#if (defined(CONFIG_SYSFS) || defined(CONFIG_PROC_FS)) && \
+ (defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE))
+
+int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
+ enum pci_mmap_api mmap_api)
+{
+ resource_size_t pci_start = 0, pci_end;
+ unsigned long nr, start, size;
+
+ if (pci_resource_len(pdev, resno) == 0)
+ return 0;
+ nr = vma_pages(vma);
+ start = vma->vm_pgoff;
+ size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
+ if (mmap_api == PCI_MMAP_PROCFS) {
+ pci_resource_to_user(pdev, resno, &pdev->resource[resno],
+ &pci_start, &pci_end);
+ pci_start >>= PAGE_SHIFT;
+ }
+ if (start >= pci_start && start < pci_start + size &&
+ start + nr <= pci_start + size)
+ return 1;
+ return 0;
+}
+
+#endif