gpu: nvgpu: support gk20a virtualization

The nvgpu driver now supports using the Tegra graphics virtualization
interfaces to support gk20a in a virtualized environment.

Bug 1509608

Change-Id: I6ede15ee7bf0b0ad8a13e8eb5f557c3516ead676
Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-on: http://git-master/r/440122
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/ltc_vgpu.c b/drivers/gpu/nvgpu/vgpu/ltc_vgpu.c
new file mode 100644
index 00000000..ddff23b7
--- /dev/null
+++ b/drivers/gpu/nvgpu/vgpu/ltc_vgpu.c
@@ -0,0 +1,55 @@
+/*
+ * Virtualized GPU L2
+ *
+ * Copyright (c) 2014 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include "vgpu/vgpu.h"
+
+static int vgpu_determine_L2_size_bytes(struct gk20a *g)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(g->dev);
+        u32 cache_size = 0;
+
+        gk20a_dbg_fn("");
+
+        if (vgpu_get_attribute(platform->virt_handle,
+                        TEGRA_VGPU_ATTRIB_L2_SIZE, &cache_size))
+                dev_err(dev_from_gk20a(g), "unable to get L2 size");
+
+        return cache_size;
+}
+
+static int vgpu_ltc_init_comptags(struct gk20a *g, struct gr_gk20a *gr)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(g->dev);
+        u32 max_comptag_lines = 0;
+
+        gk20a_dbg_fn("");
+
+        vgpu_get_attribute(platform->virt_handle,
+                        TEGRA_VGPU_ATTRIB_COMPTAG_LINES, &max_comptag_lines);
+        if (max_comptag_lines < 2)
+                return -ENXIO;
+
+        gk20a_allocator_init(&gr->comp_tags, "comptag",
+                              1, /* start */
+                              max_comptag_lines - 1, /* length*/
+                              1); /* align */
+        return 0;
+}
+
+void vgpu_init_ltc_ops(struct gpu_ops *gops)
+{
+        gops->ltc.determine_L2_size_bytes = vgpu_determine_L2_size_bytes;
+        gops->ltc.init_comptags = vgpu_ltc_init_comptags;
+}