drm/vmwgfx: Add support for multisampling

Support for SVGA3D_SURFACE_MULTISAMPLE and surface mob size according
to sample count.
Signed-off-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

drivers/gpu/drm/vmwgfx/device_include/svga3d_surfacedefs.h

@@ -1235,6 +1235,26 @@ svga3dsurface_get_serialized_size(SVGA3dSurfaceFormat format,
 	return total_size * num_layers;
 }
 
+/**
+ * svga3dsurface_get_serialized_size_extended - Returns the number of bytes
+ * required for a surface with given parameters. Support for sample count.
+ */
+static inline u32
+svga3dsurface_get_serialized_size_extended(SVGA3dSurfaceFormat format,
+					   surf_size_struct base_level_size,
+					   u32 num_mip_levels,
+					   u32 num_layers,
+					   u32 num_samples)
+{
+	uint64_t total_size =
+		svga3dsurface_get_serialized_size(format,
+						  base_level_size,
+						  num_mip_levels,
+						  num_layers);
+	total_size *= max_t(u32, 1, num_samples);
+
+	return min_t(uint64_t, total_size, (uint64_t)U32_MAX);
+}
 
 /**
  * svga3dsurface_get_pixel_offset - Compute the offset (in bytes) to a pixel

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

@@ -83,7 +83,7 @@
 struct vmw_fpriv {
 	struct drm_master *locked_master;
 	struct ttm_object_file *tfile;
-	bool gb_aware;
+	bool gb_aware; /* user-space is guest-backed aware */
 };
 
 struct vmw_buffer_object {

drivers/gpu/drm/vmwgfx/vmwgfx_surface.c

@@ -1399,6 +1399,7 @@ int vmw_surface_gb_priv_define(struct drm_device *dev,
 	struct vmw_surface *srf;
 	int ret;
 	u32 num_layers = 1;
+	u32 sample_count = 1;
 
 	*srf_out = NULL;
 
@@ -1481,11 +1482,15 @@ int vmw_surface_gb_priv_define(struct drm_device *dev,
 	else if (svga3d_flags & SVGA3D_SURFACE_CUBEMAP)
 		num_layers = SVGA3D_MAX_SURFACE_FACES;
 
+	if (srf->flags & SVGA3D_SURFACE_MULTISAMPLE)
+		sample_count = srf->multisample_count;
+
 	srf->res.backup_size   =
-		svga3dsurface_get_serialized_size(srf->format,
-						  srf->base_size,
-						  srf->mip_levels[0],
-						  num_layers);
+		svga3dsurface_get_serialized_size_extended(srf->format,
+							   srf->base_size,
+							   srf->mip_levels[0],
+							   num_layers,
+							   sample_count);
 
 	if (srf->flags & SVGA3D_SURFACE_BIND_STREAM_OUTPUT)
 		srf->res.backup_size += sizeof(SVGA3dDXSOState);
@@ -1595,6 +1600,10 @@ vmw_gb_surface_define_internal(struct drm_device *dev,
 			return -EINVAL;
 	}
 
+	if ((svga3d_flags_64 & SVGA3D_SURFACE_MULTISAMPLE) &&
+	    req->base.multisample_count == 0)
+		return -EINVAL;
+
 	if (req->base.mip_levels > DRM_VMW_MAX_MIP_LEVELS)
 		return -EINVAL;