gpu: nvgpu: unit: Add unit testing FW

Full documentation for this is in the unit testing
confluence page.

JIRA NVGPU-525
Bug 2261555

Change-Id: I463e6267eb0eb12b7313f8b275266e8faabe5ccf
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1683915
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/userspace/src/nvgpu.c b/userspace/src/nvgpu.c
new file mode 100644
index 00000000..a9b7ced3
--- /dev/null
+++ b/userspace/src/nvgpu.c
@@ -0,0 +1,78 @@
+/*
+ * 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 <dlfcn.h>
+#include <stdlib.h>
+
+#include <unit/io.h>
+#include <unit/core.h>
+
+/*
+ * Load libnvgpu-drv.so. This is done with dlopen() since this will make
+ * resolving addresses into symbols easier in the future.
+ *
+ * Also, this makes people think carefully about what functions to call in
+ * nvgpu-drv from the unit test FW. The interaction should really be limited
+ * and doing explicit name lookups is a good way to prevent too much coupling.
+ */
+int core_load_nvgpu(struct unit_fw *fw)
+{
+        const char *msg;
+
+        /*
+         * Specify a GLOBAL binding so that subsequently loaded unit tests see
+         * the nvgpu-drv library. They will of course need it (and will access
+         * it directly). I.e they will link against nvgpu-drv and this should
+         * satisfy that linkage.
+         */
+        fw->nvgpu_so = dlopen("libnvgpu-drv.so", RTLD_NOW | RTLD_GLOBAL);
+
+        if (fw->nvgpu_so == NULL) {
+                msg = dlerror();
+                core_err(fw, "Failed to load nvgpu-drv: %s\n", msg);
+                return -1;
+        }
+
+        /*
+         * We directly check the value of the returned symbol for these
+         * functions against NULL because if it is NULL then something is
+         * terribly wrong.
+         */
+
+        fw->nvgpu.nvgpu_posix_probe = dlsym(fw->nvgpu_so,
+                                            "nvgpu_posix_probe");
+        if (fw->nvgpu.nvgpu_posix_probe == NULL) {
+                msg = dlerror();
+                core_err(fw, "Failed to resolve nvgpu_posix_probe: %s\n", msg);
+                return -1;
+        }
+
+        fw->nvgpu.nvgpu_posix_cleanup = dlsym(fw->nvgpu_so,
+                                              "nvgpu_posix_cleanup");
+        if (fw->nvgpu.nvgpu_posix_cleanup == NULL) {
+                msg = dlerror();
+                core_err(fw, "Failed to resolve nvgpu_posix_cleanup: %s\n", msg);
+                return -1;
+        }
+
+        return 0;
+}