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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /include/linux/tty_buffer.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/linux/tty_buffer.h')
-rw-r--r-- | include/linux/tty_buffer.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/include/linux/tty_buffer.h b/include/linux/tty_buffer.h new file mode 100644 index 000000000..31125e3be --- /dev/null +++ b/include/linux/tty_buffer.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_TTY_BUFFER_H +#define _LINUX_TTY_BUFFER_H + +#include <linux/atomic.h> +#include <linux/llist.h> +#include <linux/mutex.h> +#include <linux/workqueue.h> + +struct tty_buffer { + union { + struct tty_buffer *next; + struct llist_node free; + }; + unsigned int used; + unsigned int size; + unsigned int commit; + unsigned int lookahead; /* Lazy update on recv, can become less than "read" */ + unsigned int read; + bool flags; + /* Data points here */ + u8 data[] __aligned(sizeof(unsigned long)); +}; + +static inline u8 *char_buf_ptr(struct tty_buffer *b, unsigned int ofs) +{ + return b->data + ofs; +} + +static inline u8 *flag_buf_ptr(struct tty_buffer *b, unsigned int ofs) +{ + return char_buf_ptr(b, ofs) + b->size; +} + +struct tty_bufhead { + struct tty_buffer *head; /* Queue head */ + struct work_struct work; + struct mutex lock; + atomic_t priority; + struct tty_buffer sentinel; + struct llist_head free; /* Free queue head */ + atomic_t mem_used; /* In-use buffers excluding free list */ + int mem_limit; + struct tty_buffer *tail; /* Active buffer */ +}; + +/* + * When a break, frame error, or parity error happens, these codes are + * stuffed into the flags buffer. + */ +#define TTY_NORMAL 0 +#define TTY_BREAK 1 +#define TTY_FRAME 2 +#define TTY_PARITY 3 +#define TTY_OVERRUN 4 + +#endif |