1 files changed, 0 insertions, 244 deletions
diff --git a/debian/patches-rt/0103-printk-nbcon-Implement-processing-in-port-lock-wrapp.patch b/debian/patches-rt/0103-printk-nbcon-Implement-processing-in-port-lock-wrapp.patch
deleted file mode 100644
index cee70cb44..000000000
--- a/debian/patches-rt/0103-printk-nbcon-Implement-processing-in-port-lock-wrapp.patch
+++ /dev/null
@@ -1,244 +0,0 @@
-From: John Ogness <john.ogness@linutronix.de>
-Date: Wed, 13 Sep 2023 08:35:23 +0000
-Subject: [PATCH 103/134] printk: nbcon: Implement processing in port->lock
- wrapper
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz
-
-Currently the port->lock wrappers uart_port_lock(),
-uart_port_unlock() (and their variants) only lock/unlock
-the spin_lock.
-
-If the port is an nbcon console, the wrappers must also
-acquire/release the console and mark the region as unsafe. This
-allows general port->lock synchronization to be synchronized
-with the nbcon console ownership.
-
-Signed-off-by: John Ogness <john.ogness@linutronix.de>
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- include/linux/console.h     |    2 +
- include/linux/printk.h      |   13 +++++++
- include/linux/serial_core.h |   18 +++++++++-
- kernel/printk/nbcon.c       |   77 ++++++++++++++++++++++++++++++++++++++++++++
- 4 files changed, 108 insertions(+), 2 deletions(-)
-
---- a/include/linux/console.h
-+++ b/include/linux/console.h
-@@ -299,6 +299,7 @@ struct nbcon_write_context {
-  * @nbcon_state:	State for nbcon consoles
-  * @nbcon_seq:		Sequence number of the next record for nbcon to print
-  * @pbufs:		Pointer to nbcon private buffer
-+ * @locked_port:	True, if the port lock is locked by nbcon
-  */
- struct console {
- 	char			name[16];
-@@ -325,6 +326,7 @@ struct console {
- 	atomic_t		__private nbcon_state;
- 	atomic_long_t		__private nbcon_seq;
- 	struct printk_buffers	*pbufs;
-+	bool			locked_port;
- };
- 
- #ifdef CONFIG_LOCKDEP
---- a/include/linux/printk.h
-+++ b/include/linux/printk.h
-@@ -9,6 +9,8 @@
- #include <linux/ratelimit_types.h>
- #include <linux/once_lite.h>
- 
-+struct uart_port;
-+
- extern const char linux_banner[];
- extern const char linux_proc_banner[];
- 
-@@ -195,6 +197,8 @@ void show_regs_print_info(const char *lo
- extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold;
- extern asmlinkage void dump_stack(void) __cold;
- void printk_trigger_flush(void);
-+extern void nbcon_acquire(struct uart_port *up);
-+extern void nbcon_release(struct uart_port *up);
- #else
- static inline __printf(1, 0)
- int vprintk(const char *s, va_list args)
-@@ -274,6 +278,15 @@ static inline void dump_stack(void)
- static inline void printk_trigger_flush(void)
- {
- }
-+
-+static inline void nbcon_acquire(struct uart_port *up)
-+{
-+}
-+
-+static inline void nbcon_release(struct uart_port *up)
-+{
-+}
-+
- #endif
- 
- #ifdef CONFIG_SMP
---- a/include/linux/serial_core.h
-+++ b/include/linux/serial_core.h
-@@ -595,6 +595,7 @@ struct uart_port {
- static inline void uart_port_lock(struct uart_port *up)
- {
- 	spin_lock(&up->lock);
-+	nbcon_acquire(up);
- }
- 
- /**
-@@ -604,6 +605,7 @@ static inline void uart_port_lock(struct
- static inline void uart_port_lock_irq(struct uart_port *up)
- {
- 	spin_lock_irq(&up->lock);
-+	nbcon_acquire(up);
- }
- 
- /**
-@@ -614,6 +616,7 @@ static inline void uart_port_lock_irq(st
- static inline void uart_port_lock_irqsave(struct uart_port *up, unsigned long *flags)
- {
- 	spin_lock_irqsave(&up->lock, *flags);
-+	nbcon_acquire(up);
- }
- 
- /**
-@@ -624,7 +627,11 @@ static inline void uart_port_lock_irqsav
-  */
- static inline bool uart_port_trylock(struct uart_port *up)
- {
--	return spin_trylock(&up->lock);
-+	if (!spin_trylock(&up->lock))
-+		return false;
-+
-+	nbcon_acquire(up);
-+	return true;
- }
- 
- /**
-@@ -636,7 +643,11 @@ static inline bool uart_port_trylock(str
-  */
- static inline bool uart_port_trylock_irqsave(struct uart_port *up, unsigned long *flags)
- {
--	return spin_trylock_irqsave(&up->lock, *flags);
-+	if (!spin_trylock_irqsave(&up->lock, *flags))
-+		return false;
-+
-+	nbcon_acquire(up);
-+	return true;
- }
- 
- /**
-@@ -645,6 +656,7 @@ static inline bool uart_port_trylock_irq
-  */
- static inline void uart_port_unlock(struct uart_port *up)
- {
-+	nbcon_release(up);
- 	spin_unlock(&up->lock);
- }
- 
-@@ -654,6 +666,7 @@ static inline void uart_port_unlock(stru
-  */
- static inline void uart_port_unlock_irq(struct uart_port *up)
- {
-+	nbcon_release(up);
- 	spin_unlock_irq(&up->lock);
- }
- 
-@@ -664,6 +677,7 @@ static inline void uart_port_unlock_irq(
-  */
- static inline void uart_port_unlock_irqrestore(struct uart_port *up, unsigned long flags)
- {
-+	nbcon_release(up);
- 	spin_unlock_irqrestore(&up->lock, flags);
- }
- 
---- a/kernel/printk/nbcon.c
-+++ b/kernel/printk/nbcon.c
-@@ -6,6 +6,7 @@
- #include <linux/console.h>
- #include <linux/delay.h>
- #include <linux/slab.h>
-+#include <linux/serial_core.h>
- #include "internal.h"
- /*
-  * Printk console printing implementation for consoles which does not depend
-@@ -995,3 +996,79 @@ void nbcon_free(struct console *con)
- 
- 	con->pbufs = NULL;
- }
-+
-+static inline bool uart_is_nbcon(struct uart_port *up)
-+{
-+	int cookie;
-+	bool ret;
-+
-+	if (!uart_console(up))
-+		return false;
-+
-+	cookie = console_srcu_read_lock();
-+	ret = (console_srcu_read_flags(up->cons) & CON_NBCON);
-+	console_srcu_read_unlock(cookie);
-+	return ret;
-+}
-+
-+/**
-+ * nbcon_acquire - The second half of the port locking wrapper
-+ * @up:		The uart port whose @lock was locked
-+ *
-+ * The uart_port_lock() wrappers will first lock the spin_lock @up->lock.
-+ * Then this function is called to implement nbcon-specific processing.
-+ *
-+ * If @up is an nbcon console, this console will be acquired and marked as
-+ * unsafe. Otherwise this function does nothing.
-+ */
-+void nbcon_acquire(struct uart_port *up)
-+{
-+	struct console *con = up->cons;
-+	struct nbcon_context ctxt;
-+
-+	if (!uart_is_nbcon(up))
-+		return;
-+
-+	WARN_ON_ONCE(con->locked_port);
-+
-+	do {
-+		do {
-+			memset(&ctxt, 0, sizeof(ctxt));
-+			ctxt.console	= con;
-+			ctxt.prio	= NBCON_PRIO_NORMAL;
-+		} while (!nbcon_context_try_acquire(&ctxt));
-+
-+	} while (!nbcon_context_enter_unsafe(&ctxt));
-+
-+	con->locked_port = true;
-+}
-+EXPORT_SYMBOL_GPL(nbcon_acquire);
-+
-+/**
-+ * nbcon_release - The first half of the port unlocking wrapper
-+ * @up:		The uart port whose @lock is about to be unlocked
-+ *
-+ * The uart_port_unlock() wrappers will first call this function to implement
-+ * nbcon-specific processing. Then afterwards the uart_port_unlock() wrappers
-+ * will unlock the spin_lock @up->lock.
-+ *
-+ * If @up is an nbcon console, the console will be marked as safe and
-+ * released. Otherwise this function does nothing.
-+ */
-+void nbcon_release(struct uart_port *up)
-+{
-+	struct console *con = up->cons;
-+	struct nbcon_context ctxt = {
-+		.console	= con,
-+		.prio		= NBCON_PRIO_NORMAL,
-+	};
-+
-+	if (!con->locked_port)
-+		return;
-+
-+	if (nbcon_context_exit_unsafe(&ctxt))
-+		nbcon_context_release(&ctxt);
-+
-+	con->locked_port = false;
-+}
-+EXPORT_SYMBOL_GPL(nbcon_release);