diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h
index 9838e8ce6ff2..4f0de974c191 100644
--- a/drivers/char/drm/drmP.h
+++ b/drivers/char/drm/drmP.h
@@ -699,7 +699,6 @@ typedef struct drm_device {
 	drm_agp_head_t *agp;	/**< AGP data */
 
 	struct pci_dev *pdev;		/**< PCI device structure */
-	int pci_domain;			/**< PCI bus domain number */
 #ifdef __alpha__
 	struct pci_controller *hose;
 #endif
@@ -721,6 +720,12 @@ static __inline__ int drm_core_check_feature(struct drm_device *dev,
 	return ((dev->driver->driver_features & feature) ? 1 : 0);
 }
 
+#ifdef __alpha__
+#define drm_get_pci_domain(dev) dev->hose->bus->number
+#else
+#define drm_get_pci_domain(dev) pci_domain_nr(dev->pdev->bus)
+#endif
+
 #if __OS_HAS_AGP
 static inline int drm_core_has_AGP(struct drm_device *dev)
 {
diff --git a/drivers/char/drm/drm_ioctl.c b/drivers/char/drm/drm_ioctl.c
index 9f20c2b5a366..e15899830581 100644
--- a/drivers/char/drm/drm_ioctl.c
+++ b/drivers/char/drm/drm_ioctl.c
@@ -127,7 +127,7 @@ int drm_setunique(struct inode *inode, struct file *filp,
 	domain = bus >> 8;
 	bus &= 0xff;
 
-	if ((domain != dev->pci_domain) ||
+	if ((domain != drm_get_pci_domain(dev)) ||
 	    (bus != dev->pdev->bus->number) ||
 	    (slot != PCI_SLOT(dev->pdev->devfn)) ||
 	    (func != PCI_FUNC(dev->pdev->devfn)))
@@ -149,7 +149,7 @@ static int drm_set_busid(drm_device_t * dev)
 		return ENOMEM;
 
 	len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
-		       dev->pci_domain, dev->pdev->bus->number,
+		       drm_get_pci_domain(dev), dev->pdev->bus->number,
 		       PCI_SLOT(dev->pdev->devfn),
 		       PCI_FUNC(dev->pdev->devfn));
 
diff --git a/drivers/char/drm/drm_irq.c b/drivers/char/drm/drm_irq.c
index 41c7020c93ef..4553a3a1e496 100644
--- a/drivers/char/drm/drm_irq.c
+++ b/drivers/char/drm/drm_irq.c
@@ -64,7 +64,7 @@ int drm_irq_by_busid(struct inode *inode, struct file *filp,
 	if (copy_from_user(&p, argp, sizeof(p)))
 		return -EFAULT;
 
-	if ((p.busnum >> 8) != dev->pci_domain ||
+	if ((p.busnum >> 8) != drm_get_pci_domain(dev) ||
 	    (p.busnum & 0xff) != dev->pdev->bus->number ||
 	    p.devnum != PCI_SLOT(dev->pdev->devfn) || p.funcnum != PCI_FUNC(dev->pdev->devfn))
 		return -EINVAL;
diff --git a/drivers/char/drm/drm_stub.c b/drivers/char/drm/drm_stub.c
index 96449d538e15..b1ead37c51d6 100644
--- a/drivers/char/drm/drm_stub.c
+++ b/drivers/char/drm/drm_stub.c
@@ -68,9 +68,6 @@ static int drm_fill_in_dev(drm_device_t * dev, struct pci_dev *pdev,
 
 #ifdef __alpha__
 	dev->hose = pdev->sysdata;
-	dev->pci_domain = dev->hose->bus->number;
-#else
-	dev->pci_domain = 0;
 #endif
 	dev->irq = pdev->irq;