powerpc/pci: Implement pci_resource_to_user() with pcibios_resource_to_bus()

"User" addresses are shown in /sys/devices/pci.../.../resource and
/proc/bus/pci/devices and used as mmap offsets for /proc/bus/pci/BB/DD.F
files.  For I/O port resources on powerpc, these are PCI bus addresses,
i.e., raw BAR values.

Previously pci_resource_to_user() computed the user address by subtracting
"hose->io_base_virt - _IO_BASE" from the resource start:

  pci_resource_to_user()
    if (IO)
      offset = (unsigned long)hose->io_base_virt - _IO_BASE;
    *start = rsrc->start - offset;

We've already told the PCI core about that "hose->io_base_virt - _IO_BASE"
offset:

  pcibios_setup_phb_resources()
    res = &hose->io_resource;
    offset = pcibios_io_space_offset();
    /* i.e., "offset = hose->io_base_virt - _IO_BASE" */
    pci_add_resource_offset(resources, res, offset);

so pcibios_resource_to_bus() knows how to do that translation.

No functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 8c6beb0..6de6e0e 100644 (file)
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -581,39 +581,25 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
                          const struct resource *rsrc,
                          resource_size_t *start, resource_size_t *end)
 {
-       struct pci_controller *hose = pci_bus_to_host(dev->bus);
-       resource_size_t offset = 0;
+       struct pci_bus_region region;
 
-       if (hose == NULL)
+       if (rsrc->flags & IORESOURCE_IO) {
+               pcibios_resource_to_bus(dev->bus, &region,
+                                       (struct resource *) rsrc);
+               *start = region.start;
+               *end = region.end;
                return;
+       }
 
-       if (rsrc->flags & IORESOURCE_IO)
-               offset = (unsigned long)hose->io_base_virt - _IO_BASE;
-
-       /* We pass a fully fixed up address to userland for MMIO instead of
-        * a BAR value because X is lame and expects to be able to use that
-        * to pass to /dev/mem !
-        *
-        * That means that we'll have potentially 64 bits values where some
-        * userland apps only expect 32 (like X itself since it thinks only
-        * Sparc has 64 bits MMIO) but if we don't do that, we break it on
-        * 32 bits CHRPs :-(
-        *
-        * Hopefully, the sysfs insterface is immune to that gunk. Once X
-        * has been fixed (and the fix spread enough), we can re-enable the
-        * 2 lines below and pass down a BAR value to userland. In that case
-        * we'll also have to re-enable the matching code in
-        * __pci_mmap_make_offset().
+       /* We pass a CPU physical address to userland for MMIO instead of a
+        * BAR value because X is lame and expects to be able to use that
+        * to pass to /dev/mem!
         *
-        * BenH.
+        * That means we may have 64-bit values where some apps only expect
+        * 32 (like X itself since it thinks only Sparc has 64-bit MMIO).
         */
-#if 0
-       else if (rsrc->flags & IORESOURCE_MEM)
-               offset = hose->pci_mem_offset;
-#endif
-
-       *start = rsrc->start - offset;
-       *end = rsrc->end - offset;
+       *start = rsrc->start;
+       *end = rsrc->end;
 }
 
 /**