Open source GPL/LGPL release

drivers/gpu/nvgpu/os/posix/posix-fault-injection.c

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2018-2020, 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 <stdlib.h>
+#include <stdbool.h>
+#include <nvgpu/posix/posix-fault-injection.h>
+
+_Thread_local struct nvgpu_posix_fault_inj_container *thread_fi;
+
+void nvgpu_posix_init_fault_injection(struct nvgpu_posix_fault_inj_container *c)
+{
+	thread_fi = c;
+}
+
+struct nvgpu_posix_fault_inj_container
+	*nvgpu_posix_fault_injection_get_container(void)
+{
+	return thread_fi;
+}
+
+void nvgpu_posix_enable_fault_injection(struct nvgpu_posix_fault_inj *fi,
+					bool enable, unsigned int number)
+{
+	if (number == 0U) {
+		fi->enabled = enable;
+		fi->counter = 0U;
+	} else {
+		fi->enabled = !enable;
+		fi->counter = number;
+	}
+}
+
+bool nvgpu_posix_is_fault_injection_triggered(struct nvgpu_posix_fault_inj *fi)
+{
+	return fi->enabled;
+}
+
+bool nvgpu_posix_is_fault_injection_cntr_set(struct nvgpu_posix_fault_inj *fi)
+{
+	return (fi->counter > 0U);
+}
+
+void nvgpu_posix_set_fault_injection_bitmask(struct nvgpu_posix_fault_inj *fi,
+	unsigned long *bitmask, unsigned int number)
+{
+/* TODO check for input validity */
+
+	fi->bitmask = *bitmask;
+	fi->counter = number;
+}
+
+void nvgpu_posix_reset_fault_injection_bitmask(struct nvgpu_posix_fault_inj *fi)
+{
+	fi->bitmask = 0UL;
+	fi->counter = 0U;
+}
+
+/*
+ * Return status of fault injection.
+ * Decrement fault injection count for each call.
+ */
+bool nvgpu_posix_fault_injection_handle_call(struct nvgpu_posix_fault_inj *fi)
+{
+	bool current_state = fi->enabled;
+
+	if (fi->bitmask != 0UL && fi->counter > 0U &&
+		fi->counter <= sizeof(fi->bitmask) * 8) {
+		fi->counter--;
+		if ((1UL << fi->counter) & fi->bitmask) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	if (fi->counter > 0U) {
+		fi->counter--;
+		if (fi->counter == 0U) {
+			/* for next time */
+			fi->enabled = !fi->enabled;
+		}
+	}
+
+	return current_state;
+}