Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 231 insertions, 0 deletions

diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c
new file mode 100644
index 0000000000..5af804c17a
--- /dev/null
+++ b/drivers/char/ttyprintk.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/char/ttyprintk.c
+ *
+ *  Copyright (C) 2010  Samo Pogacnik
+ */
+
+/*
+ * This pseudo device allows user to make printk messages. It is possible
+ * to store "console" messages inline with kernel messages for better analyses
+ * of the boot process, for example.
+ */
+
+#include <linux/console.h>
+#include <linux/device.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+
+struct ttyprintk_port {
+	struct tty_port port;
+	spinlock_t spinlock;
+};
+
+static struct ttyprintk_port tpk_port;
+
+/*
+ * Our simple preformatting supports transparent output of (time-stamped)
+ * printk messages (also suitable for logging service):
+ * - any cr is replaced by nl
+ * - adds a ttyprintk source tag in front of each line
+ * - too long message is fragmented, with '\'nl between fragments
+ * - TPK_STR_SIZE isn't really the write_room limiting factor, because
+ *   it is emptied on the fly during preformatting.
+ */
+#define TPK_STR_SIZE 508 /* should be bigger then max expected line length */
+#define TPK_MAX_ROOM 4096 /* we could assume 4K for instance */
+#define TPK_PREFIX KERN_SOH __stringify(CONFIG_TTY_PRINTK_LEVEL)
+
+static int tpk_curr;
+
+static char tpk_buffer[TPK_STR_SIZE + 4];
+
+static void tpk_flush(void)
+{
+	if (tpk_curr > 0) {
+		tpk_buffer[tpk_curr] = '\0';
+		printk(TPK_PREFIX "[U] %s\n", tpk_buffer);
+		tpk_curr = 0;
+	}
+}
+
+static int tpk_printk(const u8 *buf, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		if (tpk_curr >= TPK_STR_SIZE) {
+			/* end of tmp buffer reached: cut the message in two */
+			tpk_buffer[tpk_curr++] = '\\';
+			tpk_flush();
+		}
+
+		switch (buf[i]) {
+		case '\r':
+			tpk_flush();
+			if ((i + 1) < count && buf[i + 1] == '\n')
+				i++;
+			break;
+		case '\n':
+			tpk_flush();
+			break;
+		default:
+			tpk_buffer[tpk_curr++] = buf[i];
+			break;
+		}
+	}
+
+	return count;
+}
+
+/*
+ * TTY operations open function.
+ */
+static int tpk_open(struct tty_struct *tty, struct file *filp)
+{
+	tty->driver_data = &tpk_port;
+
+	return tty_port_open(&tpk_port.port, tty, filp);
+}
+
+/*
+ * TTY operations close function.
+ */
+static void tpk_close(struct tty_struct *tty, struct file *filp)
+{
+	struct ttyprintk_port *tpkp = tty->driver_data;
+
+	tty_port_close(&tpkp->port, tty, filp);
+}
+
+/*
+ * TTY operations write function.
+ */
+static ssize_t tpk_write(struct tty_struct *tty, const u8 *buf, size_t count)
+{
+	struct ttyprintk_port *tpkp = tty->driver_data;
+	unsigned long flags;
+	int ret;
+
+	/* exclusive use of tpk_printk within this tty */
+	spin_lock_irqsave(&tpkp->spinlock, flags);
+	ret = tpk_printk(buf, count);
+	spin_unlock_irqrestore(&tpkp->spinlock, flags);
+
+	return ret;
+}
+
+/*
+ * TTY operations write_room function.
+ */
+static unsigned int tpk_write_room(struct tty_struct *tty)
+{
+	return TPK_MAX_ROOM;
+}
+
+/*
+ * TTY operations hangup function.
+ */
+static void tpk_hangup(struct tty_struct *tty)
+{
+	struct ttyprintk_port *tpkp = tty->driver_data;
+
+	tty_port_hangup(&tpkp->port);
+}
+
+/*
+ * TTY port operations shutdown function.
+ */
+static void tpk_port_shutdown(struct tty_port *tport)
+{
+	struct ttyprintk_port *tpkp =
+		container_of(tport, struct ttyprintk_port, port);
+	unsigned long flags;
+
+	spin_lock_irqsave(&tpkp->spinlock, flags);
+	tpk_flush();
+	spin_unlock_irqrestore(&tpkp->spinlock, flags);
+}
+
+static const struct tty_operations ttyprintk_ops = {
+	.open = tpk_open,
+	.close = tpk_close,
+	.write = tpk_write,
+	.write_room = tpk_write_room,
+	.hangup = tpk_hangup,
+};
+
+static const struct tty_port_operations tpk_port_ops = {
+	.shutdown = tpk_port_shutdown,
+};
+
+static struct tty_driver *ttyprintk_driver;
+
+static struct tty_driver *ttyprintk_console_device(struct console *c,
+						   int *index)
+{
+	*index = 0;
+	return ttyprintk_driver;
+}
+
+static struct console ttyprintk_console = {
+	.name = "ttyprintk",
+	.device = ttyprintk_console_device,
+};
+
+static int __init ttyprintk_init(void)
+{
+	int ret;
+
+	spin_lock_init(&tpk_port.spinlock);
+
+	ttyprintk_driver = tty_alloc_driver(1,
+			TTY_DRIVER_RESET_TERMIOS |
+			TTY_DRIVER_REAL_RAW |
+			TTY_DRIVER_UNNUMBERED_NODE);
+	if (IS_ERR(ttyprintk_driver))
+		return PTR_ERR(ttyprintk_driver);
+
+	tty_port_init(&tpk_port.port);
+	tpk_port.port.ops = &tpk_port_ops;
+
+	ttyprintk_driver->driver_name = "ttyprintk";
+	ttyprintk_driver->name = "ttyprintk";
+	ttyprintk_driver->major = TTYAUX_MAJOR;
+	ttyprintk_driver->minor_start = 3;
+	ttyprintk_driver->type = TTY_DRIVER_TYPE_CONSOLE;
+	ttyprintk_driver->init_termios = tty_std_termios;
+	ttyprintk_driver->init_termios.c_oflag = OPOST | OCRNL | ONOCR | ONLRET;
+	tty_set_operations(ttyprintk_driver, &ttyprintk_ops);
+	tty_port_link_device(&tpk_port.port, ttyprintk_driver, 0);
+
+	ret = tty_register_driver(ttyprintk_driver);
+	if (ret < 0) {
+		printk(KERN_ERR "Couldn't register ttyprintk driver\n");
+		goto error;
+	}
+
+	register_console(&ttyprintk_console);
+
+	return 0;
+
+error:
+	tty_driver_kref_put(ttyprintk_driver);
+	tty_port_destroy(&tpk_port.port);
+	return ret;
+}
+
+static void __exit ttyprintk_exit(void)
+{
+	unregister_console(&ttyprintk_console);
+	tty_unregister_driver(ttyprintk_driver);
+	tty_driver_kref_put(ttyprintk_driver);
+	tty_port_destroy(&tpk_port.port);
+}
+
+device_initcall(ttyprintk_init);
+module_exit(ttyprintk_exit);
+
+MODULE_LICENSE("GPL");