PCI: Cleanup PCI_REBAR_CTRL_BAR_SHIFT handling

Cleanup PCI_REBAR_CTRL_BAR_SHIFT handling.  That was hard coded instead of
properly defined in the header for some reason.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pci.c

@@ -1193,7 +1193,7 @@ static void pci_restore_rebar_state(struct pci_dev *pdev)
 		res = pdev->resource + bar_idx;
 		size = order_base_2((resource_size(res) >> 20) | 1) - 1;
 		ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE;
-		ctrl |= size << 8;
+		ctrl |= size << PCI_REBAR_CTRL_BAR_SHIFT;
 		pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl);
 	}
 }
@@ -3098,7 +3098,7 @@ int pci_rebar_get_current_size(struct pci_dev *pdev, int bar)
 		return pos;
 
 	pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
-	return (ctrl & PCI_REBAR_CTRL_BAR_SIZE) >> 8;
+	return (ctrl & PCI_REBAR_CTRL_BAR_SIZE) >> PCI_REBAR_CTRL_BAR_SHIFT;
 }
 
 /**
@@ -3121,7 +3121,7 @@ int pci_rebar_set_size(struct pci_dev *pdev, int bar, int size)
 
 	pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
 	ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE;
-	ctrl |= size << 8;
+	ctrl |= size << PCI_REBAR_CTRL_BAR_SHIFT;
 	pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl);
 	return 0;
 }

include/uapi/linux/pci_regs.h

@@ -962,6 +962,7 @@
 #define  PCI_REBAR_CTRL_NBAR_MASK	0x000000E0  /* # of resizable BARs */
 #define  PCI_REBAR_CTRL_NBAR_SHIFT	5	    /* shift for # of BARs */
 #define  PCI_REBAR_CTRL_BAR_SIZE	0x00001F00  /* BAR size */
+#define  PCI_REBAR_CTRL_BAR_SHIFT	8	    /* shift for BAR size */
 
 /* Dynamic Power Allocation */
 #define PCI_DPA_CAP		4	/* capability register */