- Introduce a new ioctl, DRM_IOCTL_SET_VERSION. This ioctl allows the

    server or client to notify the DRM that it expects a certain version of
    the device dependent or device independent interface. If the major
    doesn't match or minor is too large, EINVAL is returned. A major of -1
    means that the requestor doesn't care about that portion of the
    interface. The ioctl returns the actual versions in the same struct.
- Introduce DRM DI interface version 1.1. If the server requests version
    1.1, then the DRM sets the unique itself according to the busid of the
    device it probed, which may then be accessed as normal using getunique.
- Request version 1.1 in libdrm's drmOpenByBusID, allowing the X Server to
    request based on a BusID. Introduce a wrapper for DRM_IOCTL_SET_VERSION
    and bump libdrm minor version.
- Pass the busid in DRIScreenInit if libdrm can handle both a busid and
    name. This allows drmOpenByBusID to be used to find the DRM instead of
    just the driver name, which allows us in the future to tie a DRM more
    strongly to the device it probed to. Introduce a function
    DRICreatePCIBusID which creates a busid in the form pci:oooo:bb:dd.f
    similar to linux's pci_name() function. This matches the format used by
    the DRM in version 1.1. libdrm knows how to match both this format and
    the old PCI:b:d:f format.
- Use the new DRICreatePCIBusID function in the *_dri.c to request the new,
    more exact busid format.

3 files changed, 73 insertions, 3 deletions

diff --git a/bsd-core/drmP.h b/bsd-core/drmP.h
index b2e045e6a..eec3faed4 100644
--- a/bsd-core/drmP.h
+++ b/bsd-core/drmP.h
@@ -390,9 +390,6 @@ struct drm_device {
 
 extern int	     DRM(flags);
 
-				/* Driver support (drm_drv.h) */
-extern int           DRM(version)( DRM_IOCTL_ARGS );
-
 				/* Memory management support (drm_memory.h) */
 extern void	     DRM(mem_init)(void);
 extern void	     DRM(mem_uninit)(void);
@@ -491,6 +488,8 @@ extern int            DRM(ati_pcigart_cleanup)(drm_device_t *dev,
 /* Locking IOCTL support (drm_drv.h) */
 extern int		DRM(lock)(DRM_IOCTL_ARGS);
 extern int		DRM(unlock)(DRM_IOCTL_ARGS);
+extern int		DRM(version)( DRM_IOCTL_ARGS );
+extern int		DRM(setversion)( DRM_IOCTL_ARGS );
 
 /* Misc. IOCTL support (drm_ioctl.h) */
 extern int		DRM(irq_busid)(DRM_IOCTL_ARGS);
diff --git a/bsd-core/drm_drv.c b/bsd-core/drm_drv.c
index 582a41126..3f4946949 100644
--- a/bsd-core/drm_drv.c
+++ b/bsd-core/drm_drv.c
@@ -135,6 +135,7 @@ static drm_ioctl_desc_t		  DRM(ioctls)[] = {
 	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)]       = { DRM(getmap),      0, 0 },
 	[DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)]    = { DRM(getclient),   0, 0 },
 	[DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)]     = { DRM(getstats),    0, 0 },
+	[DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)]   = { DRM(setversion),  0, 1 },
 
 	[DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)]    = { DRM(setunique),   1, 1 },
 	[DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]         = { DRM(noop),        1, 1 },
diff --git a/bsd-core/drm_ioctl.c b/bsd-core/drm_ioctl.c
index a195d0c44..50cf937da 100644
--- a/bsd-core/drm_ioctl.c
+++ b/bsd-core/drm_ioctl.c
@@ -79,6 +79,12 @@ int DRM(irq_busid)( DRM_IOCTL_ARGS )
 #endif
 }
 
+/*
+ * Beginning in revision 1.1 of the DRM interface, getunique will return
+ * a unique in the form pci:oooo:bb:dd.f (o=domain, b=bus, d=device, f=function)
+ * before setunique has been called.  The format for the bus-specific part of
+ * the unique is not defined for any other bus.
+ */
 int DRM(getunique)( DRM_IOCTL_ARGS )
 {
 	DRM_DEVICE;
@@ -97,6 +103,9 @@ int DRM(getunique)( DRM_IOCTL_ARGS )
 	return 0;
 }
 
+/* Deprecated in DRM version 1.1, and will return EBUSY when setversion has
+ * requested version 1.1 or greater.
+ */
 int DRM(setunique)( DRM_IOCTL_ARGS )
 {
 	DRM_DEVICE;
@@ -125,6 +134,26 @@ int DRM(setunique)( DRM_IOCTL_ARGS )
 }
 
 
+static int
+DRM(set_busid)(drm_device_t *dev)
+{
+
+	if (dev->unique != NULL)
+		return EBUSY;
+
+	dev->unique_len = 20;
+	dev->unique = DRM(alloc)(dev->unique_len + 1, DRM_MEM_DRIVER);
+	if (dev->unique == NULL)
+		return ENOMEM;
+
+	/* XXX Fix domain number (alpha hoses) */
+	snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%1x",
+	    0, pci_get_bus(dev->device), pci_get_slot(dev->device),
+	    pci_get_function(dev->device));
+
+	return 0;
+}
+
 int DRM(getmap)( DRM_IOCTL_ARGS )
 {
 	DRM_DEVICE;
@@ -231,6 +260,47 @@ int DRM(getstats)( DRM_IOCTL_ARGS )
 	return 0;
 }
 
+int DRM(setversion)(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_set_version_t sv;
+	drm_set_version_t retv;
+
+	DRM_COPY_FROM_USER_IOCTL(sv, (drm_set_version_t *)data, sizeof(sv));
+
+	retv.drm_di_major = 1;
+	retv.drm_di_minor = 1;
+	retv.drm_dd_major = DRIVER_MAJOR;
+	retv.drm_dd_minor = DRIVER_MINOR;
+	
+	DRM_COPY_TO_USER_IOCTL((drm_set_version_t *)data, retv, sizeof(sv));
+
+	if (sv.drm_di_major != -1) {
+		if (sv.drm_di_major != 1 || sv.drm_di_minor < 0)
+			return EINVAL;
+		if (sv.drm_di_minor > 1)
+			return EINVAL;
+		if (sv.drm_di_minor >= 1) {
+			/*
+			 * Version 1.1 includes tying of DRM to specific device
+			 */
+			DRM(set_busid)(dev);
+		}
+	}
+
+	if (sv.drm_dd_major != -1) {
+		if (sv.drm_dd_major != DRIVER_MAJOR || sv.drm_dd_minor < 0)
+			return EINVAL;
+		if (sv.drm_dd_minor > DRIVER_MINOR)
+			return EINVAL;
+#ifdef DRIVER_SETVERSION
+		DRIVER_SETVERSION(dev, sv);
+#endif
+	}
+	return 0;
+}
+
+
 int DRM(noop)(DRM_IOCTL_ARGS)
 {
 	DRM_DEBUG("\n");