1 files changed, 137 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/posix/nvgpu.c b/drivers/gpu/nvgpu/common/posix/nvgpu.c
new file mode 100644
index 00000000..6f2a5fe9
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/posix/nvgpu.c
@@ -0,0 +1,137 @@
+/*
+ * 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/bug.h>
+#include <nvgpu/types.h>
+#include <nvgpu/atomic.h>
+#include <nvgpu/nvgpu_common.h>
+#include <nvgpu/os_sched.h>
+
+#include <nvgpu/posix/probe.h>
+
+#include "os_posix.h"
+
+#include "gk20a/gk20a.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();
+}
+
+/*
+ * 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)
+{
+}
+
+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);
+}