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Message-Id: <20260206191136.2609767-5-slava@dubeyko.com>
Date: Fri, 6 Feb 2026 11:11:36 -0800
From: Viacheslav Dubeyko <slava@...eyko.com>
To: linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org,
bpf@...r.kernel.org
Cc: Slava.Dubeyko@....com,
slava@...eyko.com,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 4/4] ml-lib: Implement simple user-space testing application
Implement simple user-space testing application
Signed-off-by: Viacheslav Dubeyko <slava@...eyko.com>
---
.../test_application/ml_lib_char_dev_ioctl.h | 21 ++
.../test_application/test_ml_lib_char_dev.c | 206 ++++++++++++++++++
2 files changed, 227 insertions(+)
create mode 100644 lib/ml-lib/test_driver/test_application/ml_lib_char_dev_ioctl.h
create mode 100644 lib/ml-lib/test_driver/test_application/test_ml_lib_char_dev.c
diff --git a/lib/ml-lib/test_driver/test_application/ml_lib_char_dev_ioctl.h b/lib/ml-lib/test_driver/test_application/ml_lib_char_dev_ioctl.h
new file mode 100644
index 000000000000..7ea74e840fda
--- /dev/null
+++ b/lib/ml-lib/test_driver/test_application/ml_lib_char_dev_ioctl.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Machine Learning (ML) library
+ *
+ * Userspace API for ml_lib_dev testing driver
+ *
+ * Copyright (C) 2025-2026 Viacheslav Dubeyko <slava@...eyko.com>
+ */
+
+#ifndef _ML_LIB_TEST_DEV_IOCTL_H
+#define _ML_LIB_TEST_DEV_IOCTL_H
+
+#include <linux/ioctl.h>
+
+/* IOCTL commands */
+#define ML_LIB_TEST_DEV_IOC_MAGIC 'M'
+#define ML_LIB_TEST_DEV_IOCRESET _IO(ML_LIB_TEST_DEV_IOC_MAGIC, 0)
+#define ML_LIB_TEST_DEV_IOCGETSIZE _IOR(ML_LIB_TEST_DEV_IOC_MAGIC, 1, int)
+#define ML_LIB_TEST_DEV_IOCSETSIZE _IOW(ML_LIB_TEST_DEV_IOC_MAGIC, 2, int)
+
+#endif /* _ML_LIB_TEST_DEV_IOCTL_H */
diff --git a/lib/ml-lib/test_driver/test_application/test_ml_lib_char_dev.c b/lib/ml-lib/test_driver/test_application/test_ml_lib_char_dev.c
new file mode 100644
index 000000000000..432b8a0ad068
--- /dev/null
+++ b/lib/ml-lib/test_driver/test_application/test_ml_lib_char_dev.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Machine Learning (ML) library
+ *
+ * Test program for ml_lib_dev testing driver
+ *
+ * Copyright (C) 2025-2026 Viacheslav Dubeyko <slava@...eyko.com>
+ *
+ * Compile with: gcc -o test_ml_lib_char_dev test_ml_lib_char_dev.c
+ * Run with: sudo ./test_ml_lib_char_dev
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+
+#include "ml_lib_char_dev_ioctl.h"
+
+#define DEVICE_PATH "/dev/mllibdev"
+#define SYSFS_BASE "/sys/class/ml_lib_test/mllibdev"
+#define PROC_PATH "/proc/mllibdev"
+
+static void print_separator(const char *title)
+{
+ printf("\n========== %s ==========\n", title);
+}
+
+static void read_sysfs_attr(const char *attr_name)
+{
+ char path[256];
+ char buffer[256];
+ FILE *fp;
+
+ snprintf(path, sizeof(path), "%s/%s", SYSFS_BASE, attr_name);
+ fp = fopen(path, "r");
+ if (!fp) {
+ perror("Failed to open sysfs attribute");
+ return;
+ }
+
+ if (fgets(buffer, sizeof(buffer), fp)) {
+ printf(" %s: %s", attr_name, buffer);
+ }
+
+ fclose(fp);
+}
+
+static void show_sysfs_info(void)
+{
+ print_separator("Sysfs Attributes");
+ read_sysfs_attr("buffer_size");
+ read_sysfs_attr("data_size");
+ read_sysfs_attr("access_count");
+ printf("\n");
+ read_sysfs_attr("stats");
+}
+
+static void show_proc_info(void)
+{
+ char buffer[1024];
+ FILE *fp;
+
+ print_separator("Procfs Information");
+
+ fp = fopen(PROC_PATH, "r");
+ if (!fp) {
+ perror("Failed to open procfs entry");
+ return;
+ }
+
+ while (fgets(buffer, sizeof(buffer), fp)) {
+ printf("%s", buffer);
+ }
+
+ fclose(fp);
+}
+
+static void test_write(int fd)
+{
+ const char *test_data = "Hello from userspace! This is a test of the mllibdev driver.";
+ ssize_t ret;
+
+ print_separator("Write Test");
+
+ ret = write(fd, test_data, strlen(test_data));
+ if (ret < 0) {
+ perror("Write failed");
+ return;
+ }
+
+ printf("Successfully wrote %zd bytes\n", ret);
+ printf("Data: \"%s\"\n", test_data);
+}
+
+static void test_read(int fd)
+{
+ char buffer[256];
+ ssize_t ret;
+
+ print_separator("Read Test");
+
+ /* Seek to beginning */
+ lseek(fd, 0, SEEK_SET);
+
+ ret = read(fd, buffer, sizeof(buffer) - 1);
+ if (ret < 0) {
+ perror("Read failed");
+ return;
+ }
+
+ buffer[ret] = '\0';
+ printf("Successfully read %zd bytes\n", ret);
+ printf("Data: \"%s\"\n", buffer);
+}
+
+static void test_ioctl(int fd)
+{
+ int size;
+ int ret;
+
+ print_separator("IOCTL Tests");
+
+ /* Get current size */
+ ret = ioctl(fd, ML_LIB_TEST_DEV_IOCGETSIZE, &size);
+ if (ret < 0) {
+ perror("IOCTL GETSIZE failed");
+ return;
+ }
+ printf("Current data size: %d bytes\n", size);
+
+ /* Set new size */
+ size = 50;
+ ret = ioctl(fd, ML_LIB_TEST_DEV_IOCSETSIZE, &size);
+ if (ret < 0) {
+ perror("IOCTL SETSIZE failed");
+ return;
+ }
+ printf("Set data size to: %d bytes\n", size);
+
+ /* Verify new size */
+ ret = ioctl(fd, ML_LIB_TEST_DEV_IOCGETSIZE, &size);
+ if (ret < 0) {
+ perror("IOCTL GETSIZE failed");
+ return;
+ }
+ printf("Verified new size: %d bytes\n", size);
+
+ /* Reset buffer */
+ ret = ioctl(fd, ML_LIB_TEST_DEV_IOCRESET);
+ if (ret < 0) {
+ perror("IOCTL RESET failed");
+ return;
+ }
+ printf("Buffer reset successfully\n");
+
+ /* Verify size after reset */
+ ret = ioctl(fd, ML_LIB_TEST_DEV_IOCGETSIZE, &size);
+ if (ret < 0) {
+ perror("IOCTL GETSIZE failed");
+ return;
+ }
+ printf("Size after reset: %d bytes\n", size);
+}
+
+int main(void)
+{
+ int fd;
+
+ printf("ML Library Testing Device Driver Test Program\n");
+ printf("==================================\n");
+
+ /* Open the device */
+ fd = open(DEVICE_PATH, O_RDWR);
+ if (fd < 0) {
+ perror("Failed to open device");
+ printf("\nMake sure:\n");
+ printf("1. The driver module is loaded (lsmod | grep mllibdev)\n");
+ printf("2. You have proper permissions (run with sudo)\n");
+ printf("3. The device node exists (ls -l /dev/mllibdev)\n");
+ return 1;
+ }
+
+ printf("Device opened successfully: %s\n", DEVICE_PATH);
+
+ /* Run tests */
+ test_write(fd);
+ test_read(fd);
+ test_ioctl(fd);
+
+ /* Show sysfs and proc information */
+ show_sysfs_info();
+ show_proc_info();
+
+ /* Final stats */
+ print_separator("Final Test");
+ printf("All tests completed successfully!\n\n");
+
+ /* Close the device */
+ close(fd);
+
+ return 0;
+}
--
2.34.1
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