48 lines
1.9 KiB
Diff
48 lines
1.9 KiB
Diff
From 3b3da4e4e9170710e72c9c414e5800c6d887dbc9 Mon Sep 17 00:00:00 2001
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From: John Ogness <john.ogness@linutronix.de>
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Date: Fri, 8 Dec 2023 15:54:27 +0000
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Subject: [PATCH 130/196] printk: nbcon: Add driver_enter/driver_exit console
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callbacks
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Console drivers need some mechanism to synchronize between "normal
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driver activity" and console printing. For uart serial drivers it
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is the port lock. Other types of console drivers (network,
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graphics, USB) will need something as well.
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Provide 2 new mandatory nbcon console callbacks (driver_enter and
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driver_exit) to allow the consoles drivers to implement the
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appropriate synchronization. The callbacks are also expected to
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disable/enable migration.
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Signed-off-by: John Ogness <john.ogness@linutronix.de>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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include/linux/console.h | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/include/linux/console.h b/include/linux/console.h
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index c27bd5189660..73515c324347 100644
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--- a/include/linux/console.h
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+++ b/include/linux/console.h
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@@ -296,6 +296,8 @@ struct nbcon_write_context {
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* @node: hlist node for the console list
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*
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* @write_atomic: Write callback for atomic context
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+ * @driver_enter: Callback to begin synchronization with driver code
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+ * @driver_exit: Callback to finish synchronization with driver code
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* @nbcon_state: State for nbcon consoles
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* @nbcon_seq: Sequence number of the next record for nbcon to print
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* @pbufs: Pointer to nbcon private buffer
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@@ -323,6 +325,8 @@ struct console {
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/* nbcon console specific members */
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bool (*write_atomic)(struct console *con,
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struct nbcon_write_context *wctxt);
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+ void (*driver_enter)(struct console *con, unsigned long *flags);
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+ void (*driver_exit)(struct console *con, unsigned long flags);
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atomic_t __private nbcon_state;
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atomic_long_t __private nbcon_seq;
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struct printk_buffers *pbufs;
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--
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2.43.2
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