PCI: Fix proc mmap on sparc

In 8c05cd08a7 ("PCI: fix offset check for sysfs mmapped files"), try
to check exposed value with resource start/end in proc mmap path.

|        start = vma->vm_pgoff;
|        size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
|        pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
|                        pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
|        if (start >= pci_start && start < pci_start + size &&
|                        start + nr <= pci_start + size)

vma->vm_pgoff is above code segment is user/BAR value >> PAGE_SHIFT.
pci_start is resource->start >> PAGE_SHIFT.

For sparc, resource start is different from BAR start aka pci bus address.
pci bus address need to add offset to be the resource start.

So that commit breaks all arch that exposed value is BAR/user value,
and need to be offseted to resource address.

test code using: ./test_mmap_proc /proc/bus/pci/0000:00/04.0 0x2000000
test code segment:
  fd = open(argv[1], O_RDONLY);
  ...
  sscanf(argv[2], "0x%lx", &offset);
  left = offset & (PAGE_SIZE - 1);
  offset &= PAGE_MASK;
  ioctl(fd, PCIIOC_MMAP_IS_MEM);
  addr = mmap(NULL, PAGE_SIZE, PROT_READ, MAP_SHARED, fd, offset);
  for (i = 0; i < 8; i++)
    printf("%x ", addr[i + left]);
  munmap(addr, PAGE_SIZE);
  close(fd);

Fixes: 8c05cd08a7 ("PCI: fix offset check for sysfs mmapped files")
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Orabug: 22855133

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
(cherry picked from commit 7bd8ad7855e6ecdac36c6dc7946f5b6beff13ae2)
Signed-off-by: Allen Pais <allen.pais@oracle.com>

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 0f1d8479caa3034b765acf997be985a161d0f67f..07271674f3e086e2cbaded35195044b461578fba 100644 (file)
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -973,15 +973,20 @@ void pci_remove_legacy_files(struct pci_bus *b)
 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
                  enum pci_mmap_api mmap_api)
 {
-       unsigned long nr, start, size, pci_start;
+       unsigned long nr, start, size, pci_start = 0;
 
        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;
-       pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
-                       pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
+       if (mmap_api == PCI_MMAP_PROCFS) {
+               resource_size_t user_start, user_end;
+
+               pci_resource_to_user(pdev, resno, &pdev->resource[resno],
+                                       &user_start, &user_end);
+               pci_start = user_start >> PAGE_SHIFT;
+       }
        if (start >= pci_start && start < pci_start + size &&
                        start + nr <= pci_start + size)
                return 1;