From 5e2a86cb1be935f1c54efcf5b4e6a1b7371ff5e7 Mon Sep 17 00:00:00 2001
From: Jakob Bornecrantz <jakob@vmware.com>
Date: Tue, 8 Dec 2009 21:05:30 +0100
Subject: vmware/xorg: Properly detect overlay support

---
 src/gallium/winsys/drm/vmware/xorg/vmw_ioctl.c | 31 ++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'src/gallium/winsys/drm/vmware/xorg/vmw_ioctl.c')

diff --git a/src/gallium/winsys/drm/vmware/xorg/vmw_ioctl.c b/src/gallium/winsys/drm/vmware/xorg/vmw_ioctl.c
index c84368bab7..0d1a0fcee6 100644
--- a/src/gallium/winsys/drm/vmware/xorg/vmw_ioctl.c
+++ b/src/gallium/winsys/drm/vmware/xorg/vmw_ioctl.c
@@ -56,6 +56,37 @@ struct vmw_dma_buffer
     uint32_t size;
 };
 
+static int
+vmw_ioctl_get_param(struct vmw_driver *vmw, uint32_t param, uint64_t *out)
+{
+    struct drm_vmw_getparam_arg gp_arg;
+    int ret;
+
+    memset(&gp_arg, 0, sizeof(gp_arg));
+    gp_arg.param = param;
+    ret = drmCommandWriteRead(vmw->fd, DRM_VMW_GET_PARAM,
+	    &gp_arg, sizeof(gp_arg));
+
+    if (ret == 0) {
+	*out = gp_arg.value;
+    }
+
+    return ret;
+}
+
+int
+vmw_ioctl_supports_overlay(struct vmw_driver *vmw)
+{
+    uint64_t value;
+    int ret;
+
+    ret = vmw_ioctl_get_param(vmw, DRM_VMW_PARAM_OVERLAY_IOCTL, &value);
+    if (ret)
+	return ret;
+
+    return value ? 0 : -ENOSYS;
+}
+
 int
 vmw_ioctl_cursor_bypass(struct vmw_driver *vmw, int xhot, int yhot)
 {
-- 
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