powerpc/pci: Move hose_list and pci_address_to_pio to pci-common

move the definition of hose_list next to its hotplug spinlock.

create pcibios_io_size to encapsulate ifdef in existing pci-common
function pcibios_vaddr_is_ioport

move pci_address_to_pio to pci-common, using new pcibios_io_size, and
protect this GPL exported function against concurrent hotplug removal

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 35 insertions, 6 deletions

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 0f4181272311..2ad17315fc88 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -38,6 +38,7 @@
 #include <asm/eeh.h>
 
 static DEFINE_SPINLOCK(hose_spinlock);
+LIST_HEAD(hose_list);
 
 /* XXX kill that some day ... */
 static int global_phb_number;           /* Global phb counter */
@@ -113,19 +114,24 @@ void pcibios_free_controller(struct pci_controller *phb)
                 kfree(phb);
 }
 
+static resource_size_t pcibios_io_size(const struct pci_controller *hose)
+{
+#ifdef CONFIG_PPC64
+        return hose->pci_io_size;
+#else
+        return hose->io_resource.end - hose->io_resource.start + 1;
+#endif
+}
+
 int pcibios_vaddr_is_ioport(void __iomem *address)
 {
         int ret = 0;
         struct pci_controller *hose;
-        unsigned long size;
+        resource_size_t size;
 
         spin_lock(&hose_spinlock);
         list_for_each_entry(hose, &hose_list, list_node) {
-#ifdef CONFIG_PPC64
-                size = hose->pci_io_size;
-#else
-                size = hose->io_resource.end - hose->io_resource.start + 1;
-#endif
+                size = pcibios_io_size(hose);
                 if (address >= hose->io_base_virt &&
                     address < (hose->io_base_virt + size)) {
                         ret = 1;
@@ -136,6 +142,29 @@ int pcibios_vaddr_is_ioport(void __iomem *address)
         return ret;
 }
 
+unsigned long pci_address_to_pio(phys_addr_t address)
+{
+        struct pci_controller *hose;
+        resource_size_t size;
+        unsigned long ret = ~0;
+
+        spin_lock(&hose_spinlock);
+        list_for_each_entry(hose, &hose_list, list_node) {
+                size = pcibios_io_size(hose);
+                if (address >= hose->io_base_phys &&
+                    address < (hose->io_base_phys + size)) {
+                        unsigned long base =
+                                (unsigned long)hose->io_base_virt - _IO_BASE;
+                        ret = base + (address - hose->io_base_phys);
+                        break;
+                }
+        }
+        spin_unlock(&hose_spinlock);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(pci_address_to_pio);
+
 /*
  * Return the domain number for this bus.
  */