gpu: nvgpu: posix: move the posix dir to os

Since the posix code is supporting a particular OS this code
should belong under os/ not common/.

Change-Id: Idf5f75b8ab9d614c9dd43ea23dab8df3c346c0ef
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1800658
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/posix/thread.c b/drivers/gpu/nvgpu/os/posix/thread.c
new file mode 100644
index 00000000..d9476523
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/posix/thread.c
@@ -0,0 +1,96 @@
+/*
+ * 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 <nvgpu/bug.h>
+#include <nvgpu/thread.h>
+
+#include <nvgpu/posix/thread.h>
+
+/**
+ * Use pthreads to mostly emulate the Linux kernel APIs. There are some things
+ * that are quite different - especially the stop/should_stop notions. In user
+ * space threads can send signals to one another but of course within the kernel
+ * that is not as simple.
+ *
+ * This could use some nice debugging some day as well.
+ */
+
+/*
+ * nvgpu thread functions return int. POSIX threads return void *. This little
+ * wrapper takes the int returning nvgpu thread and instead passes that int back
+ * through the void * pointer.
+ */
+static void *__nvgpu_posix_thread_wrapper(void *data)
+{
+        struct nvgpu_posix_thread_data *nvgpu = data;
+
+        return ERR_PTR(nvgpu->fn(nvgpu->data));
+}
+
+int nvgpu_thread_create(struct nvgpu_thread *thread,
+                        void *data,
+                        int (*threadfn)(void *data), const char *name)
+{
+        int ret;
+
+        BUG_ON(thread->running);
+
+        memset(thread, 0, sizeof(*thread));
+
+        /*
+         * By subtracting 1 the above memset ensures that we have a zero
+         * terminated string.
+         */
+        strncpy(thread->tname, name, NVGPU_THREAD_POSIX_MAX_NAMELEN - 1);
+
+        thread->nvgpu.data = data;
+        thread->nvgpu.fn = threadfn;
+
+        ret = pthread_create(&thread->thread, NULL,
+                             __nvgpu_posix_thread_wrapper,
+                             &thread->nvgpu);
+        if (ret != 0)
+                return ret;
+
+#ifdef _GNU_SOURCE
+        pthread_setname_np(thread->thread, thread->tname);
+#endif
+
+        thread->running = true;
+
+        return 0;
+}
+
+void nvgpu_thread_stop(struct nvgpu_thread *thread)
+{
+        thread->should_stop = true;
+}
+
+bool nvgpu_thread_should_stop(struct nvgpu_thread *thread)
+{
+        return thread->should_stop;
+}
+
+bool nvgpu_thread_is_running(struct nvgpu_thread *thread)
+{
+        return thread->running;
+}