drm: Fix support for PCI domains

(For some reason I thought that went in ages ago ...)

This fixes support for PCI domains in what should hopefully be a backward
compatible way along with a change to libdrm.

When the interface version is set to 1.4, we assume userspace understands
domains and the world is at peace. We thus pass proper domain numbers
instead of 0 to userspace.

The newer libdrm will then try 1.4 first, and fallback to 1.1, along with
ignoring domains in the later case (well, except on alpha of course)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 18 insertions, 7 deletions

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 7b03b197fc00..47db4df37a69 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -392,6 +392,7 @@ int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_pri
                 if (sv->drm_di_minor >= 1) {
                         /*
                          * Version 1.1 includes tying of DRM to specific device
+                         * Version 1.4 has proper PCI domain support
                          */
                         retcode = drm_set_busid(dev, file_priv);
                         if (retcode)
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index e2a4da7d7fab..2a512bc0d4ab 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1075,7 +1075,6 @@ static __inline__ int drm_core_check_feature(struct drm_device *dev,
         return ((dev->driver->driver_features & feature) ? 1 : 0);
 }
 
-
 static inline int drm_dev_to_irq(struct drm_device *dev)
 {
         if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE))
@@ -1084,11 +1083,22 @@ static inline int drm_dev_to_irq(struct drm_device *dev)
                 return dev->pdev->irq;
 }
 
-#ifdef __alpha__
-#define drm_get_pci_domain(dev) dev->hose->index
-#else
-#define drm_get_pci_domain(dev) 0
-#endif
+static inline int drm_get_pci_domain(struct drm_device *dev)
+{
+        if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE))
+                return 0;
+
+#ifndef __alpha__
+        /* For historical reasons, drm_get_pci_domain() is busticated
+         * on most archs and has to remain so for userspace interface
+         * < 1.4, except on alpha which was right from the beginning
+         */
+        if (dev->if_version < 0x10004)
+                return 0;
+#endif /* __alpha__ */
+
+        return pci_domain_nr(dev->pdev->bus);
+}
 
 #if __OS_HAS_AGP
 static inline int drm_core_has_AGP(struct drm_device *dev)
diff --git a/include/drm/drm_core.h b/include/drm/drm_core.h
index 316739036079..4e7523863a4b 100644
--- a/include/drm/drm_core.h
+++ b/include/drm/drm_core.h
@@ -27,7 +27,7 @@
 #define CORE_DATE               "20060810"
 
 #define DRM_IF_MAJOR    1
-#define DRM_IF_MINOR    3
+#define DRM_IF_MINOR    4
 
 #define CORE_MAJOR      1
 #define CORE_MINOR      1