kms: add uevent support.

When we get a hotplug event from the kernel we should notify the client side to reconfigure displays.

based on work by ajax in intel driver.

Signed-off-by: Dave Airlie <airlied@redhat.com>

configure.ac

@@ -152,6 +152,10 @@ if test "$DRI" = yes; then
                         else
                                 DRM_MODE=no
 			fi
+			PKG_CHECK_MODULES(LIBUDEV, [libudev], [LIBUDEV=yes], [LIBUDEV=no])
+			if test "x$LIBUDEV" = xyes; then
+			       AC_DEFINE(HAVE_LIBUDEV, 1,[libudev support])
+			fi
         	fi
 	fi
 	CFLAGS="$save_CFLAGS"
@@ -159,6 +163,7 @@ else
 	DRM_MODE=no
 fi
 AM_CONDITIONAL(DRM_MODE, test x$DRM_MODE = xyes)
+AM_CONDITIONAL(LIBUDEV, test x$LIBUDEV = xyes)
 
 save_CFLAGS="$CFLAGS"
 CFLAGS="$XORG_CFLAGS"
@@ -358,6 +363,8 @@ AC_SUBST([XORG_CFLAGS])
 AC_SUBST([DRI_CFLAGS])
 AC_SUBST([LIBDRM_RADEON_CFLAGS])
 AC_SUBST([LIBDRM_RADEON_LIBS])
+AC_SUBST([LIBUDEV_CFLAGS])
+AC_SUBST([LIBUDEV_LIBS])
 AC_SUBST([moduledir])
 
 DRIVER_NAME=ati

src/Makefile.am

@@ -78,6 +78,7 @@ AM_CFLAGS = \
             @XORG_CFLAGS@ \
             @DRI_CFLAGS@ \
             @XMODES_CFLAGS@ \
+            @LIBUDEV_CFLAGS@ \
             -DDISABLE_EASF \
             -DENABLE_ALL_SERVICE_FUNCTIONS \
             -DATOM_BIOS \
@@ -91,6 +92,10 @@ ati_drv_la_LIBADD = $(PCIACCESS_LIBS)
 radeon_drv_la_LIBADD += $(PCIACCESS_LIBS)
 endif
 
+if LIBUDEV
+radeon_drv_la_LIBADD += $(LIBUDEV_LIBS)
+endif
+
 ati_drv_la_LTLIBRARIES = ati_drv.la
 ati_drv_la_LDFLAGS = -module -avoid-version
 ati_drv_ladir = @moduledir@/drivers

src/drmmode_display.c

@@ -1159,6 +1159,7 @@ Bool drmmode_pre_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int cpp)
 	xf86CrtcConfigInit(pScrn, &drmmode_xf86crtc_config_funcs);
 	xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
 
+	drmmode->scrn = pScrn;
 	drmmode->cpp = cpp;
 	drmmode->mode_res = drmModeGetResources(drmmode->fd);
 	if (!drmmode->mode_res)
@@ -1347,4 +1348,67 @@ Bool drmmode_setup_colormap(ScreenPtr pScreen, ScrnInfoPtr pScrn)
          return FALSE;
     return TRUE;
 }
+
+#ifdef HAVE_LIBUDEV
+static void
+drmmode_handle_uevents(int fd, void *closure)
+{
+	drmmode_ptr drmmode = closure;
+	ScrnInfoPtr scrn = drmmode->scrn;
+	struct udev_device *dev;
+	dev = udev_monitor_receive_device(drmmode->uevent_monitor);
+	if (!dev)
+		return;
+
+	RRGetInfo(screenInfo.screens[scrn->scrnIndex], TRUE);
+	udev_device_unref(dev);
+}
+#endif
+
+void drmmode_uevent_init(ScrnInfoPtr scrn, drmmode_ptr drmmode)
+{
+#ifdef HAVE_LIBUDEV
+	struct udev *u;
+	struct udev_monitor *mon;
+
+	u = udev_new();
+	if (!u)
+		return;
+	mon = udev_monitor_new_from_netlink(u, "udev");
+	if (!mon) {
+		udev_unref(u);
+		return;
+	}
+
+	if (udev_monitor_filter_add_match_subsystem_devtype(mon,
+							    "drm",
+							    "drm_minor") < 0 ||
+	    udev_monitor_enable_receiving(mon) < 0) {
+		udev_monitor_unref(mon);
+		udev_unref(u);
+		return;
+	}
+
+	drmmode->uevent_handler =
+		xf86AddGeneralHandler(udev_monitor_get_fd(mon),
+				      drmmode_handle_uevents,
+				      drmmode);
+
+	drmmode->uevent_monitor = mon;
+#endif
+}
+
+void drmmode_uevent_fini(ScrnInfoPtr scrn, drmmode_ptr drmmode)
+{
+#ifdef HAVE_LIBUDEV
+	if (drmmode->uevent_handler) {
+		struct udev *u = udev_monitor_get_udev(drmmode->uevent_monitor);
+		xf86RemoveGeneralHandler(drmmode->uevent_handler);
+
+		udev_monitor_unref(drmmode->uevent_monitor);
+		udev_unref(u);
+	}
+#endif
+}
+
 #endif

src/drmmode_display.h

@@ -30,6 +30,9 @@
 #ifdef XF86DRM_MODE
 
 #include "xf86drmMode.h"
+#ifdef HAVE_LIBUDEV
+#include "libudev.h"
+#endif
 
 #include "radeon_probe.h"
 
@@ -40,10 +43,14 @@ typedef struct {
   drmModeFBPtr mode_fb;
   int cpp;
   struct radeon_bo_manager *bufmgr;
+  ScrnInfoPtr scrn;
+#ifdef HAVE_LIBUDEV
+  struct udev_monitor *uevent_monitor;
+  InputHandlerProc uevent_handler;
+#endif
 } drmmode_rec, *drmmode_ptr;
 
 typedef struct {
-
     drmmode_ptr drmmode;
     drmModeCrtcPtr mode_crtc;
     struct radeon_bo *cursor_bo;
@@ -81,6 +88,10 @@ void drmmode_adjust_frame(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int x, int y,
 extern Bool drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode);
 extern void drmmode_copy_fb(ScrnInfoPtr pScrn, drmmode_ptr drmmode);
 extern Bool drmmode_setup_colormap(ScreenPtr pScreen, ScrnInfoPtr pScrn);
+
+extern void drmmode_uevent_init(ScrnInfoPtr scrn, drmmode_ptr drmmode);
+extern void drmmode_uevent_fini(ScrnInfoPtr scrn, drmmode_ptr drmmode);
+
 #endif
 
 #endif

src/radeon_kms.c

@@ -601,6 +601,7 @@ static Bool RADEONCloseScreen_KMS(int scrnIndex, ScreenPtr pScreen)
     xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, RADEON_LOGLEVEL_DEBUG,
 		   "RADEONCloseScreen\n");
 
+    drmmode_uevent_fini(pScrn, &info->drmmode);
     if (info->cs)
       radeon_cs_flush_indirect(pScrn);
 
@@ -866,6 +867,7 @@ Bool RADEONScreenInit_KMS(int scrnIndex, ScreenPtr pScreen,
     info->accel_state->XInited3D = FALSE;
     info->accel_state->engineMode = EXA_ENGINEMODE_UNKNOWN;
 
+    drmmode_uevent_init(pScrn, &info->drmmode);
     return TRUE;
 }