From 01e6fac4d61fdd7fff5433942ec93fc2ea1e4df1 Mon Sep 17 00:00:00 2001
From: Joshua Bakita <bakitajoshua@gmail.com>
Date: Wed, 28 Jun 2023 18:24:25 -0400
Subject: Include nvgpu headers

These are needed to build on NVIDIA's Jetson boards for the time
being. Only a couple structs are required, so it should be fairly
easy to remove this dependency at some point in the future.
---
 include/os/posix/nvgpu.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 include/os/posix/nvgpu.c

(limited to 'include/os/posix/nvgpu.c')

diff --git a/include/os/posix/nvgpu.c b/include/os/posix/nvgpu.c
new file mode 100644
index 0000000..e485ed7
--- /dev/null
+++ b/include/os/posix/nvgpu.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * 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
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+#include <nvgpu/gk20a.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/types.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/os_sched.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/posix/probe.h>
+
+#include "os_posix.h"
+
+void nvgpu_wait_for_deferred_interrupts(struct gk20a *g)
+{
+	/*
+	 * No interrupts in userspace so nothing to wait for.
+	 */
+}
+
+int nvgpu_current_pid(struct gk20a *g)
+{
+	/*
+	 * In the kernel this gets us the PID of the calling process for IOCTLs.
+	 * But since we are in userspace this doesn't quite mean the same thing.
+	 * This simply returns the PID of the currently running process.
+	 */
+	return (int)getpid();
+}
+
+int nvgpu_current_tid(struct gk20a *g)
+{
+	/*
+	 * In POSIX thread ID is not the same as a process ID. In Linux threads
+	 * and processes are represented by the same thing, but userspace can't
+	 * really rely on that.
+	 *
+	 * We can, however, get a pthread_t for a given thread. But this
+	 * pthread_t need not have any relation to the underlying system's
+	 * representation of "threads".
+	 */
+	return (int)pthread_self();
+}
+
+void __nvgpu_print_current(struct gk20a *g, const char *func_name, int line,
+		void *ctx, enum nvgpu_log_type type)
+{
+	__nvgpu_log_msg(g, func_name, line, type,
+			"Current process: (nvgpu userspace)");
+}
+
+/*
+ * Somewhat meaningless in userspace...
+ */
+void nvgpu_kernel_restart(void *cmd)
+{
+	BUG();
+}
+
+/*
+ * We have no runtime PM stuff in userspace so these are really just noops.
+ */
+void gk20a_busy_noresume(struct gk20a *g)
+{
+}
+
+void gk20a_idle_nosuspend(struct gk20a *g)
+{
+}
+
+bool gk20a_check_poweron(struct gk20a *g)
+{
+	return false;
+}
+
+int gk20a_busy(struct gk20a *g)
+{
+	nvgpu_atomic_inc(&g->usage_count);
+
+	return 0;
+}
+
+void gk20a_idle(struct gk20a *g)
+{
+	nvgpu_atomic_dec(&g->usage_count);
+}
+
+/*
+ * This function aims to initialize enough stuff to make unit testing worth
+ * while. There are several interfaces and APIs that rely on the struct gk20a's
+ * state in order to function: logging, for example, but there are many other
+ * things, too.
+ *
+ * Initialize as much of that as possible here. This is meant to be equivalent
+ * to the kernel space driver's probe function.
+ */
+struct gk20a *nvgpu_posix_probe(void)
+{
+	struct gk20a *g;
+	struct nvgpu_os_posix *p;
+	int err;
+
+	p = malloc(sizeof(*p));
+	if (p == NULL)
+		return NULL;
+
+	g = &p->g;
+
+	err = nvgpu_kmem_init(g);
+	if (err != 0)
+		goto fail;
+
+	return g;
+
+fail:
+	free(p);
+
+	return NULL;
+}
+
+void nvgpu_posix_cleanup(struct gk20a *g)
+{
+	nvgpu_kmem_fini(g, 0);
+}
-- 
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