virgl: add driver for virtio-gpu 3D (v2)

virgl is the 3D acceleration backend for the
virtio-gpu shipping with qemu.

The 3D acceleration is designed around gallium
and TGSI as the virtualisation layer. The backend
renderer translates the virgl interface into
OpenGL currently.

This is the initial import of the driver to mesa.

The kernel driver portions are lined up for drm-next.

Currently this driver supports up to GL3.3 and some
misc extensions if the host driver exposes it. It is
planned to iterate the virgl API to new GL levels
as mesa host drivers gain features.

v2: fix resource tracking across flushes to avoid
->bind hack in mapping.
consolidate mapping and waiting code for transfers.
use u_range for dirt tracking.
handle larger shaders in protocol.
include virtgpu_drm.h in mesa for now.
add translation layer for gallium tgsi to virgl tgsi.

Signed-off-by: Dave Airlie <[email protected]>

1 files changed, 66 insertions, 0 deletions

diff --git a/src/gallium/drivers/virgl/virgl_tgsi.c b/src/gallium/drivers/virgl/virgl_tgsi.c
new file mode 100644
index 00000000000..641b0b3e3b5
--- /dev/null
+++ b/src/gallium/drivers/virgl/virgl_tgsi.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2014, 2015 Red Hat.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* the virgl hw tgsi vs what the current gallium want will diverge over time.
+   so add a transform stage to remove things we don't want to send unless
+   the receiver supports it.
+*/
+#include "tgsi/tgsi_transform.h"
+#include "virgl_context.h"
+struct virgl_transform_context {
+   struct tgsi_transform_context base;
+};
+
+/* for now just strip out the new properties the remote doesn't understand
+   yet */
+static void
+virgl_tgsi_transform_property(struct tgsi_transform_context *ctx,
+                              struct tgsi_full_property *prop)
+{
+   switch (prop->Property.PropertyName) {
+   case TGSI_PROPERTY_NUM_CLIPDIST_ENABLED:
+   case TGSI_PROPERTY_NUM_CULLDIST_ENABLED:
+      break;
+   default:
+      ctx->emit_property(ctx, prop);
+      break;
+   }
+}
+
+struct tgsi_token *virgl_tgsi_transform(const struct tgsi_token *tokens_in)
+{
+
+   struct virgl_transform_context transform;
+   const uint newLen = tgsi_num_tokens(tokens_in);
+   struct tgsi_token *new_tokens;
+
+   new_tokens = tgsi_alloc_tokens(newLen);
+   if (!new_tokens)
+      return NULL;
+
+   memset(&transform, 0, sizeof(transform));
+   transform.base.transform_property = virgl_tgsi_transform_property;
+   tgsi_transform_shader(tokens_in, new_tokens, newLen, &transform.base);
+
+   return new_tokens;
+}