Lab 6

lab_6/Kbuild

@@ -0,0 +1,3 @@
+# kbuild part of makefile
+obj-m   := hello1.o hello2.o
+ccflags-y := -I$(obj)/inc -g

lab_6/Makefile

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+
+ifneq ($(KERNELRELEASE),)
+include Kbuild
+else
+# normal makefile
+KDIR ?= /lib/modules/`uname -r`/build
+
+default:
+	$(MAKE) -C $(KDIR) M=$$PWD
+	cp hello1.ko hello1.ko.unstripped
+	$(CROSS_COMPILE)strip -g hello1.ko
+
+clean:
+	$(MAKE) -C $(KDIR) M=$$PWD clean
+
+endif

lab_6/hello1.c

@@ -0,0 +1,133 @@
+
+/*
+ * Copyright (c) 2017, GlobalLogic Ukraine LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by the GlobalLogic.
+ * 4. Neither the name of the GlobalLogic nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GLOBALLOGIC UKRAINE LLC ``AS IS`` AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL GLOBALLOGIC UKRAINE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+
+#define DEBUG
+
+MODULE_AUTHOR("Serhii Popovych <serhii.popovych@globallogic.com>");
+MODULE_DESCRIPTION("Hello, world in Linux Kernel Training");
+MODULE_LICENSE("Dual BSD/GPL");
+
+struct TimingList {
+	struct TimingList *next;
+	ktime_t time_before, time_after;
+};
+
+static struct TimingList *list_head;
+static unsigned int bug_generator;
+
+static struct TimingList *write_first_node(void)
+{
+	list_head = kmalloc(sizeof(struct TimingList), GFP_KERNEL);
+	list_head->next = NULL;
+
+	return list_head;
+}
+
+static struct TimingList *insert_next_node(struct TimingList *tail)
+{
+	struct TimingList *new_node = kmalloc(sizeof(struct TimingList),
+						GFP_KERNEL);
+
+	if (bug_generator == 5) {
+		new_node = NULL;
+	} else {
+		tail->next = new_node;
+		new_node->next = NULL;
+	}
+
+	return new_node;
+}
+
+static struct TimingList *add_new_node(struct TimingList *tail)
+{
+	if (tail == NULL)
+		return write_first_node();
+	else
+		return insert_next_node(tail);
+}
+
+static void print_time_diff(struct TimingList *node)
+{
+	pr_debug("%lld\n", node->time_after - node->time_before);
+}
+
+void destroy_list(void)
+{
+	struct TimingList *current_node = list_head;
+	struct TimingList *next_node = NULL;
+
+	list_head = NULL;
+
+	while (current_node != NULL) {
+		print_time_diff(current_node);
+
+		next_node = current_node->next;
+		kfree(current_node);
+		current_node = next_node;
+	}
+}
+EXPORT_SYMBOL(destroy_list);
+
+static int __init hello_init(void)
+{
+	return 0;
+}
+
+void print_hello(int message_count)
+{
+	int i;
+	struct TimingList *current_tail = list_head;
+
+	for (i = 0; i < message_count; i++) {
+		bug_generator = i;
+
+		current_tail = add_new_node(current_tail);
+
+		current_tail->time_before = ktime_get();
+		pr_info("Hello, world!\n");
+		current_tail->time_after = ktime_get();
+	}
+}
+EXPORT_SYMBOL(print_hello);
+
+static void __exit hello_exit(void)
+{
+	destroy_list();
+}
+
+
+module_init(hello_init);
+module_exit(hello_exit);

lab_6/hello2.c

@@ -0,0 +1,65 @@
+
+/*
+ * Copyright (c) 2017, GlobalLogic Ukraine LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by the GlobalLogic.
+ * 4. Neither the name of the GlobalLogic nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GLOBALLOGIC UKRAINE LLC ``AS IS`` AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL GLOBALLOGIC UKRAINE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+
+#include "hello1.h"
+
+MODULE_AUTHOR("Serhii Popovych <serhii.popovych@globallogic.com>");
+MODULE_DESCRIPTION("Hello, world in Linux Kernel Training");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static unsigned int message_count = 1;
+
+static int __init hello_init(void)
+{
+	BUG_ON(message_count > 10);
+
+	if (message_count == 0 || message_count >= 5)
+		pr_warn("Warning: message_count = %d (message_count == 0 or 5 <= message_count <= 10)\n", message_count);
+
+	print_hello(message_count);
+	return 0;
+}
+
+static void __exit hello_exit(void)
+{
+	destroy_list();
+}
+
+module_param(message_count, uint, 0444);
+MODULE_PARM_DESC(message_count, "Amount of hello world outputs on load");
+
+module_init(hello_init);
+module_exit(hello_exit);

lab_6/inc/hello1.h

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+void print_hello(int message_count);
+void destroy_list(void);

lab_6/test.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+if [ -z "$1" ]; then
+	echo "Error: no script supplied"
+	echo "Usage: $0 path/to/testing/script"
+	exit 1
+fi
+
+while read l; do
+	if [ -z "$l" ]; then
+		continue;
+	fi;
+
+	echo "$ $l";
+	$($l);
+
+	echo -e ""
+done < $1

lab_6/tests/lab6-test

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+insmod lab_6/hello2.ko
+
+insmod lab_6/hello1.ko
+
+insmod lab_6/hello2.ko
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko message_count=0
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko message_count=1
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko message_count=3
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko message_count=5
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko message_count=8
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko message_count=10
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko message_count=12
+rmmod hello2.ko
+
+insmod lab_6/hello2.ko
+rmmod hello1.ko
+
+rmmod hello2.ko
+rmmod hello1.ko