[PATCH 2/3] drm/vmwgfx: Write the driver id registers

[Zack Rusin <zack@kde.org>]

From: Zack Rusin <zackr@vmware.com>

Driver id registers are a new mechanism in the svga device to hint to the
device which driver is running. This should not change device behavior
in any way, but might be convenient to work-around specific bugs
in guest drivers.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 43 +++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 6d675855f065..72a17618ba0a 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -25,10 +25,13 @@
  *
  **************************************************************************/
 
-#include <linux/dma-mapping.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/cc_platform.h>
+
+#include "vmwgfx_drv.h"
+
+#include "vmwgfx_devcaps.h"
+#include "vmwgfx_mksstat.h"
+#include "vmwgfx_binding.h"
+#include "ttm_object.h"
 
 #include <drm/drm_aperture.h>
 #include <drm/drm_drv.h>
@@ -41,11 +44,11 @@
 #include <drm/ttm/ttm_placement.h>
 #include <generated/utsrelease.h>
 
-#include "ttm_object.h"
-#include "vmwgfx_binding.h"
-#include "vmwgfx_devcaps.h"
-#include "vmwgfx_drv.h"
-#include "vmwgfx_mksstat.h"
+#include <linux/cc_platform.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/version.h>
 
 #define VMWGFX_DRIVER_DESC "Linux drm driver for VMware graphics devices"
 
@@ -806,6 +809,27 @@ static int vmw_detect_version(struct vmw_private *dev)
 	return 0;
 }
 
+static void vmw_write_driver_id(struct vmw_private *dev)
+{
+	if ((dev->capabilities2 & SVGA_CAP2_DX2) != 0) {
+		vmw_write(dev,  SVGA_REG_GUEST_DRIVER_ID,
+			  SVGA_REG_GUEST_DRIVER_ID_LINUX);
+
+		vmw_write(dev, SVGA_REG_GUEST_DRIVER_VERSION1,
+			  LINUX_VERSION_MAJOR << 24 |
+			  LINUX_VERSION_PATCHLEVEL << 16 |
+			  LINUX_VERSION_SUBLEVEL);
+		vmw_write(dev, SVGA_REG_GUEST_DRIVER_VERSION2,
+			  VMWGFX_DRIVER_MAJOR << 24 |
+			  VMWGFX_DRIVER_MINOR << 16 |
+			  VMWGFX_DRIVER_PATCHLEVEL);
+		vmw_write(dev, SVGA_REG_GUEST_DRIVER_VERSION3, 0);
+
+		vmw_write(dev, SVGA_REG_GUEST_DRIVER_ID,
+			  SVGA_REG_GUEST_DRIVER_ID_SUBMIT);
+	}
+}
+
 static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
 {
 	int ret;
@@ -1094,6 +1118,7 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
 	vmw_host_printf("vmwgfx: Module Version: %d.%d.%d (kernel: %s)",
 			VMWGFX_DRIVER_MAJOR, VMWGFX_DRIVER_MINOR,
 			VMWGFX_DRIVER_PATCHLEVEL, UTS_RELEASE);
+	vmw_write_driver_id(dev_priv);
 
 	if (dev_priv->enable_fb) {
 		vmw_fifo_resource_inc(dev_priv);
-- 
2.32.0