PCI: define PCI resource names in an 'enum'

This patch moves all definitions of the PCI resource names to an 'enum',
and also replaces some hard-coded resource variables with symbol
names. This change eases introduction of device specific resources.

Reviewed-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 24 insertions, 13 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index c5e02f324e13..da1c22bab40e 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -82,7 +82,30 @@ enum pci_mmap_state {
 #define PCI_DMA_FROMDEVICE      2
 #define PCI_DMA_NONE            3
 
-#define DEVICE_COUNT_RESOURCE   12
+/*
+ *  For PCI devices, the region numbers are assigned this way:
+ */
+enum {
+        /* #0-5: standard PCI resources */
+        PCI_STD_RESOURCES,
+        PCI_STD_RESOURCE_END = 5,
+
+        /* #6: expansion ROM resource */
+        PCI_ROM_RESOURCE,
+
+        /* resources assigned to buses behind the bridge */
+#define PCI_BRIDGE_RESOURCE_NUM 4
+
+        PCI_BRIDGE_RESOURCES,
+        PCI_BRIDGE_RESOURCE_END = PCI_BRIDGE_RESOURCES +
+                                  PCI_BRIDGE_RESOURCE_NUM - 1,
+
+        /* total resources associated with a PCI device */
+        PCI_NUM_RESOURCES,
+
+        /* preserve this for compatibility */
+        DEVICE_COUNT_RESOURCE
+};
 
 typedef int __bitwise pci_power_t;
 
@@ -274,18 +297,6 @@ static inline void pci_add_saved_cap(struct pci_dev *pci_dev,
         hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space);
 }
 
-/*
- *  For PCI devices, the region numbers are assigned this way:
- *
- *      0-5     standard PCI regions
- *      6       expansion ROM
- *      7-10    bridges: address space assigned to buses behind the bridge
- */
-
-#define PCI_ROM_RESOURCE        6
-#define PCI_BRIDGE_RESOURCES    7
-#define PCI_NUM_RESOURCES       11
-
 #ifndef PCI_BUS_NUM_RESOURCES
 #define PCI_BUS_NUM_RESOURCES   16
 #endif