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, 64 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c b/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
new file mode 100644
index 00000000..ea4fde79
--- /dev/null
+++ b/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
@@ -0,0 +1,64 @@
+/*
+ * Tegra Virtualized GPU Platform Interface
+ *
+ * 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 <linux/of_platform.h>
+
+#include "gk20a.h"
+#include "hal_gk20a.h"
+#include "platform_gk20a.h"
+
+static int gk20a_tegra_probe(struct platform_device *dev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct device_node *np = dev->dev.of_node;
+        const __be32 *host1x_ptr;
+        struct platform_device *host1x_pdev = NULL;
+
+        host1x_ptr = of_get_property(np, "nvidia,host1x", NULL);
+        if (host1x_ptr) {
+                struct device_node *host1x_node =
+                        of_find_node_by_phandle(be32_to_cpup(host1x_ptr));
+
+                host1x_pdev = of_find_device_by_node(host1x_node);
+                if (!host1x_pdev) {
+                        dev_warn(&dev->dev, "host1x device not available");
+                        return -EPROBE_DEFER;
+                }
+
+        } else {
+                host1x_pdev = to_platform_device(dev->dev.parent);
+                dev_warn(&dev->dev, "host1x reference not found. assuming host1x to be parent");
+        }
+
+        platform->g->host1x_dev = host1x_pdev;
+
+        return 0;
+}
+
+struct gk20a_platform vgpu_tegra_platform = {
+        .has_syncpoints = true,
+
+        /* power management configuration */
+        .can_railgate           = false,
+        .enable_slcg            = false,
+        .enable_blcg            = false,
+        .enable_elcg            = false,
+        .enable_elpg            = false,
+        .enable_aelpg           = false,
+
+        .probe = gk20a_tegra_probe,
+
+        .virtual_dev = true,
+};