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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
It's been a long time since anyone has looked at what struct tty_struct looks like in memory, turns out there was a ton of holes. So move things around a bit, change one variable (closing) from being an int to a bool (it is only being tested for 0/1), and we end up saving 40 bytes per structure overall on x86-64 systems. Before this patch: /* size: 696, cachelines: 11, members: 37 */ /* sum members: 665, holes: 8, sum holes: 31 */ /* forced alignments: 2, forced holes: 1, sum forced holes: 4 */ /* last cacheline: 56 bytes */ After this change: /* size: 656, cachelines: 11, members: 37 */ /* sum members: 654, holes: 1, sum holes: 2 */ /* forced alignments: 2 */ /* last cacheline: 16 bytes */ Cc: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/2023082519-cobbler-unholy-8d1f@gregkh Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
518 lines
18 KiB
C
518 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TTY_H
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#define _LINUX_TTY_H
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#include <linux/fs.h>
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#include <linux/major.h>
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#include <linux/termios.h>
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#include <linux/workqueue.h>
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#include <linux/tty_buffer.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_ldisc.h>
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#include <linux/tty_port.h>
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#include <linux/mutex.h>
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#include <linux/tty_flags.h>
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#include <uapi/linux/tty.h>
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#include <linux/rwsem.h>
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#include <linux/llist.h>
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/*
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* (Note: the *_driver.minor_start values 1, 64, 128, 192 are
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* hardcoded at present.)
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*/
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#define NR_UNIX98_PTY_DEFAULT 4096 /* Default maximum for Unix98 ptys */
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#define NR_UNIX98_PTY_RESERVE 1024 /* Default reserve for main devpts */
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#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
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/*
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* This character is the same as _POSIX_VDISABLE: it cannot be used as
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* a c_cc[] character, but indicates that a particular special character
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* isn't in use (eg VINTR has no character etc)
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*/
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#define __DISABLED_CHAR '\0'
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#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])
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#define QUIT_CHAR(tty) ((tty)->termios.c_cc[VQUIT])
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#define ERASE_CHAR(tty) ((tty)->termios.c_cc[VERASE])
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#define KILL_CHAR(tty) ((tty)->termios.c_cc[VKILL])
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#define EOF_CHAR(tty) ((tty)->termios.c_cc[VEOF])
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#define TIME_CHAR(tty) ((tty)->termios.c_cc[VTIME])
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#define MIN_CHAR(tty) ((tty)->termios.c_cc[VMIN])
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#define SWTC_CHAR(tty) ((tty)->termios.c_cc[VSWTC])
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#define START_CHAR(tty) ((tty)->termios.c_cc[VSTART])
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#define STOP_CHAR(tty) ((tty)->termios.c_cc[VSTOP])
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#define SUSP_CHAR(tty) ((tty)->termios.c_cc[VSUSP])
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#define EOL_CHAR(tty) ((tty)->termios.c_cc[VEOL])
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#define REPRINT_CHAR(tty) ((tty)->termios.c_cc[VREPRINT])
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#define DISCARD_CHAR(tty) ((tty)->termios.c_cc[VDISCARD])
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#define WERASE_CHAR(tty) ((tty)->termios.c_cc[VWERASE])
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#define LNEXT_CHAR(tty) ((tty)->termios.c_cc[VLNEXT])
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#define EOL2_CHAR(tty) ((tty)->termios.c_cc[VEOL2])
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#define _I_FLAG(tty, f) ((tty)->termios.c_iflag & (f))
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#define _O_FLAG(tty, f) ((tty)->termios.c_oflag & (f))
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#define _C_FLAG(tty, f) ((tty)->termios.c_cflag & (f))
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#define _L_FLAG(tty, f) ((tty)->termios.c_lflag & (f))
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#define I_IGNBRK(tty) _I_FLAG((tty), IGNBRK)
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#define I_BRKINT(tty) _I_FLAG((tty), BRKINT)
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#define I_IGNPAR(tty) _I_FLAG((tty), IGNPAR)
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#define I_PARMRK(tty) _I_FLAG((tty), PARMRK)
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#define I_INPCK(tty) _I_FLAG((tty), INPCK)
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#define I_ISTRIP(tty) _I_FLAG((tty), ISTRIP)
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#define I_INLCR(tty) _I_FLAG((tty), INLCR)
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#define I_IGNCR(tty) _I_FLAG((tty), IGNCR)
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#define I_ICRNL(tty) _I_FLAG((tty), ICRNL)
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#define I_IUCLC(tty) _I_FLAG((tty), IUCLC)
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#define I_IXON(tty) _I_FLAG((tty), IXON)
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#define I_IXANY(tty) _I_FLAG((tty), IXANY)
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#define I_IXOFF(tty) _I_FLAG((tty), IXOFF)
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#define I_IMAXBEL(tty) _I_FLAG((tty), IMAXBEL)
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#define I_IUTF8(tty) _I_FLAG((tty), IUTF8)
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#define O_OPOST(tty) _O_FLAG((tty), OPOST)
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#define O_OLCUC(tty) _O_FLAG((tty), OLCUC)
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#define O_ONLCR(tty) _O_FLAG((tty), ONLCR)
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#define O_OCRNL(tty) _O_FLAG((tty), OCRNL)
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#define O_ONOCR(tty) _O_FLAG((tty), ONOCR)
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#define O_ONLRET(tty) _O_FLAG((tty), ONLRET)
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#define O_OFILL(tty) _O_FLAG((tty), OFILL)
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#define O_OFDEL(tty) _O_FLAG((tty), OFDEL)
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#define O_NLDLY(tty) _O_FLAG((tty), NLDLY)
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#define O_CRDLY(tty) _O_FLAG((tty), CRDLY)
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#define O_TABDLY(tty) _O_FLAG((tty), TABDLY)
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#define O_BSDLY(tty) _O_FLAG((tty), BSDLY)
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#define O_VTDLY(tty) _O_FLAG((tty), VTDLY)
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#define O_FFDLY(tty) _O_FLAG((tty), FFDLY)
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#define C_BAUD(tty) _C_FLAG((tty), CBAUD)
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#define C_CSIZE(tty) _C_FLAG((tty), CSIZE)
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#define C_CSTOPB(tty) _C_FLAG((tty), CSTOPB)
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#define C_CREAD(tty) _C_FLAG((tty), CREAD)
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#define C_PARENB(tty) _C_FLAG((tty), PARENB)
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#define C_PARODD(tty) _C_FLAG((tty), PARODD)
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#define C_HUPCL(tty) _C_FLAG((tty), HUPCL)
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#define C_CLOCAL(tty) _C_FLAG((tty), CLOCAL)
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#define C_CIBAUD(tty) _C_FLAG((tty), CIBAUD)
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#define C_CRTSCTS(tty) _C_FLAG((tty), CRTSCTS)
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#define C_CMSPAR(tty) _C_FLAG((tty), CMSPAR)
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#define L_ISIG(tty) _L_FLAG((tty), ISIG)
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#define L_ICANON(tty) _L_FLAG((tty), ICANON)
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#define L_XCASE(tty) _L_FLAG((tty), XCASE)
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#define L_ECHO(tty) _L_FLAG((tty), ECHO)
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#define L_ECHOE(tty) _L_FLAG((tty), ECHOE)
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#define L_ECHOK(tty) _L_FLAG((tty), ECHOK)
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#define L_ECHONL(tty) _L_FLAG((tty), ECHONL)
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#define L_NOFLSH(tty) _L_FLAG((tty), NOFLSH)
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#define L_TOSTOP(tty) _L_FLAG((tty), TOSTOP)
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#define L_ECHOCTL(tty) _L_FLAG((tty), ECHOCTL)
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#define L_ECHOPRT(tty) _L_FLAG((tty), ECHOPRT)
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#define L_ECHOKE(tty) _L_FLAG((tty), ECHOKE)
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#define L_FLUSHO(tty) _L_FLAG((tty), FLUSHO)
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#define L_PENDIN(tty) _L_FLAG((tty), PENDIN)
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#define L_IEXTEN(tty) _L_FLAG((tty), IEXTEN)
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#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
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struct device;
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struct signal_struct;
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struct tty_operations;
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/**
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* struct tty_struct - state associated with a tty while open
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*
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* @kref: reference counting by tty_kref_get() and tty_kref_put(), reaching zero
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* frees the structure
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* @dev: class device or %NULL (e.g. ptys, serdev)
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* @driver: &struct tty_driver operating this tty
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* @ops: &struct tty_operations of @driver for this tty (open, close, etc.)
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* @index: index of this tty (e.g. to construct @name like tty12)
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* @ldisc_sem: protects line discipline changes (@ldisc) -- lock tty not pty
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* @ldisc: the current line discipline for this tty (n_tty by default)
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* @atomic_write_lock: protects against concurrent writers, i.e. locks
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* @write_cnt, @write_buf and similar
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* @legacy_mutex: leftover from history (BKL -> BTM -> @legacy_mutex),
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* protecting several operations on this tty
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* @throttle_mutex: protects against concurrent tty_throttle_safe() and
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* tty_unthrottle_safe() (but not tty_unthrottle())
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* @termios_rwsem: protects @termios and @termios_locked
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* @winsize_mutex: protects @winsize
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* @termios: termios for the current tty, copied from/to @driver.termios
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* @termios_locked: locked termios (by %TIOCGLCKTRMIOS and %TIOCSLCKTRMIOS
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* ioctls)
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* @name: name of the tty constructed by tty_line_name() (e.g. ttyS3)
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* @flags: bitwise OR of %TTY_THROTTLED, %TTY_IO_ERROR, ...
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* @count: count of open processes, reaching zero cancels all the work for
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* this tty and drops a @kref too (but does not free this tty)
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* @winsize: size of the terminal "window" (cf. @winsize_mutex)
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* @flow: flow settings grouped together, see also @flow.unused
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* @flow.lock: lock for @flow members
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* @flow.stopped: tty stopped/started by stop_tty()/start_tty()
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* @flow.tco_stopped: tty stopped/started by %TCOOFF/%TCOON ioctls (it has
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* precedence over @flow.stopped)
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* @flow.unused: alignment for Alpha, so that no members other than @flow.* are
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* modified by the same 64b word store. The @flow's __aligned is
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* there for the very same reason.
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* @ctrl: control settings grouped together, see also @ctrl.unused
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* @ctrl.lock: lock for @ctrl members
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* @ctrl.pgrp: process group of this tty (setpgrp(2))
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* @ctrl.session: session of this tty (setsid(2)). Writes are protected by both
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* @ctrl.lock and @legacy_mutex, readers must use at least one of
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* them.
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* @ctrl.pktstatus: packet mode status (bitwise OR of %TIOCPKT_ constants)
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* @ctrl.packet: packet mode enabled
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* @ctrl.unused: alignment for Alpha, see @flow.unused for explanation
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* @hw_stopped: not controlled by the tty layer, under @driver's control for CTS
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* handling
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* @receive_room: bytes permitted to feed to @ldisc without any being lost
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* @flow_change: controls behavior of throttling, see tty_throttle_safe() and
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* tty_unthrottle_safe()
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* @link: link to another pty (master -> slave and vice versa)
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* @fasync: state for %O_ASYNC (for %SIGIO); managed by fasync_helper()
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* @write_wait: concurrent writers are waiting in this queue until they are
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* allowed to write
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* @read_wait: readers wait for data in this queue
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* @hangup_work: normally a work to perform a hangup (do_tty_hangup()); while
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* freeing the tty, (re)used to release_one_tty()
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* @disc_data: pointer to @ldisc's private data (e.g. to &struct n_tty_data)
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* @driver_data: pointer to @driver's private data (e.g. &struct uart_state)
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* @files_lock: protects @tty_files list
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* @tty_files: list of (re)openers of this tty (i.e. linked &struct
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* tty_file_private)
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* @closing: when set during close, n_tty processes only START & STOP chars
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* @write_buf: temporary buffer used during tty_write() to copy user data to
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* @write_cnt: count of bytes written in tty_write() to @write_buf
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* @SAK_work: if the tty has a pending do_SAK, it is queued here
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* @port: persistent storage for this device (i.e. &struct tty_port)
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*
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* All of the state associated with a tty while the tty is open. Persistent
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* storage for tty devices is referenced here as @port and is documented in
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* &struct tty_port.
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*/
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struct tty_struct {
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struct kref kref;
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int index;
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struct device *dev;
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struct tty_driver *driver;
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struct tty_port *port;
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const struct tty_operations *ops;
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struct tty_ldisc *ldisc;
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struct ld_semaphore ldisc_sem;
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struct mutex atomic_write_lock;
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struct mutex legacy_mutex;
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struct mutex throttle_mutex;
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struct rw_semaphore termios_rwsem;
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struct mutex winsize_mutex;
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struct ktermios termios, termios_locked;
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char name[64];
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unsigned long flags;
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int count;
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unsigned int receive_room;
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struct winsize winsize;
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struct {
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spinlock_t lock;
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bool stopped;
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bool tco_stopped;
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unsigned long unused[0];
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} __aligned(sizeof(unsigned long)) flow;
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struct {
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struct pid *pgrp;
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struct pid *session;
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spinlock_t lock;
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unsigned char pktstatus;
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bool packet;
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unsigned long unused[0];
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} __aligned(sizeof(unsigned long)) ctrl;
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bool hw_stopped;
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bool closing;
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int flow_change;
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struct tty_struct *link;
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struct fasync_struct *fasync;
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wait_queue_head_t write_wait;
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wait_queue_head_t read_wait;
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struct work_struct hangup_work;
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void *disc_data;
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void *driver_data;
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spinlock_t files_lock;
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int write_cnt;
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unsigned char *write_buf;
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struct list_head tty_files;
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#define N_TTY_BUF_SIZE 4096
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struct work_struct SAK_work;
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} __randomize_layout;
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/* Each of a tty's open files has private_data pointing to tty_file_private */
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struct tty_file_private {
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struct tty_struct *tty;
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struct file *file;
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struct list_head list;
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};
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/**
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* DOC: TTY Struct Flags
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*
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* These bits are used in the :c:member:`tty_struct.flags` field.
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*
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* So that interrupts won't be able to mess up the queues,
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* copy_to_cooked must be atomic with respect to itself, as must
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* tty->write. Thus, you must use the inline functions set_bit() and
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* clear_bit() to make things atomic.
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*
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* TTY_THROTTLED
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* Driver input is throttled. The ldisc should call
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* :c:member:`tty_driver.unthrottle()` in order to resume reception when
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* it is ready to process more data (at threshold min).
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*
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* TTY_IO_ERROR
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* If set, causes all subsequent userspace read/write calls on the tty to
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* fail, returning -%EIO. (May be no ldisc too.)
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*
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* TTY_OTHER_CLOSED
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* Device is a pty and the other side has closed.
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*
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* TTY_EXCLUSIVE
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* Exclusive open mode (a single opener).
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*
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* TTY_DO_WRITE_WAKEUP
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* If set, causes the driver to call the
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* :c:member:`tty_ldisc_ops.write_wakeup()` method in order to resume
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* transmission when it can accept more data to transmit.
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*
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* TTY_LDISC_OPEN
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* Indicates that a line discipline is open. For debugging purposes only.
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*
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* TTY_PTY_LOCK
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* A flag private to pty code to implement %TIOCSPTLCK/%TIOCGPTLCK logic.
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*
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* TTY_NO_WRITE_SPLIT
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* Prevent driver from splitting up writes into smaller chunks (preserve
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* write boundaries to driver).
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*
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* TTY_HUPPED
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* The TTY was hung up. This is set post :c:member:`tty_driver.hangup()`.
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*
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* TTY_HUPPING
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* The TTY is in the process of hanging up to abort potential readers.
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*
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* TTY_LDISC_CHANGING
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* Line discipline for this TTY is being changed. I/O should not block
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* when this is set. Use tty_io_nonblock() to check.
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*
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* TTY_LDISC_HALTED
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* Line discipline for this TTY was stopped. No work should be queued to
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* this ldisc.
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*/
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#define TTY_THROTTLED 0
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#define TTY_IO_ERROR 1
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#define TTY_OTHER_CLOSED 2
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#define TTY_EXCLUSIVE 3
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#define TTY_DO_WRITE_WAKEUP 5
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#define TTY_LDISC_OPEN 11
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#define TTY_PTY_LOCK 16
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#define TTY_NO_WRITE_SPLIT 17
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#define TTY_HUPPED 18
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#define TTY_HUPPING 19
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#define TTY_LDISC_CHANGING 20
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#define TTY_LDISC_HALTED 22
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static inline bool tty_io_nonblock(struct tty_struct *tty, struct file *file)
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{
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return file->f_flags & O_NONBLOCK ||
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test_bit(TTY_LDISC_CHANGING, &tty->flags);
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}
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static inline bool tty_io_error(struct tty_struct *tty)
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{
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return test_bit(TTY_IO_ERROR, &tty->flags);
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}
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static inline bool tty_throttled(struct tty_struct *tty)
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{
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return test_bit(TTY_THROTTLED, &tty->flags);
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}
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#ifdef CONFIG_TTY
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void tty_kref_put(struct tty_struct *tty);
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struct pid *tty_get_pgrp(struct tty_struct *tty);
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void tty_vhangup_self(void);
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void disassociate_ctty(int priv);
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dev_t tty_devnum(struct tty_struct *tty);
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void proc_clear_tty(struct task_struct *p);
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struct tty_struct *get_current_tty(void);
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/* tty_io.c */
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int __init tty_init(void);
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const char *tty_name(const struct tty_struct *tty);
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struct tty_struct *tty_kopen_exclusive(dev_t device);
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struct tty_struct *tty_kopen_shared(dev_t device);
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void tty_kclose(struct tty_struct *tty);
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int tty_dev_name_to_number(const char *name, dev_t *number);
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#else
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static inline void tty_kref_put(struct tty_struct *tty)
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{ }
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static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
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{ return NULL; }
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static inline void tty_vhangup_self(void)
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{ }
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static inline void disassociate_ctty(int priv)
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{ }
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static inline dev_t tty_devnum(struct tty_struct *tty)
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{ return 0; }
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static inline void proc_clear_tty(struct task_struct *p)
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{ }
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static inline struct tty_struct *get_current_tty(void)
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{ return NULL; }
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/* tty_io.c */
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static inline int __init tty_init(void)
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{ return 0; }
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static inline const char *tty_name(const struct tty_struct *tty)
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{ return "(none)"; }
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static inline struct tty_struct *tty_kopen_exclusive(dev_t device)
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{ return ERR_PTR(-ENODEV); }
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static inline void tty_kclose(struct tty_struct *tty)
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{ }
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static inline int tty_dev_name_to_number(const char *name, dev_t *number)
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{ return -ENOTSUPP; }
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#endif
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extern struct ktermios tty_std_termios;
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int vcs_init(void);
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extern const struct class tty_class;
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/**
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* tty_kref_get - get a tty reference
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* @tty: tty device
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*
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* Return a new reference to a tty object. The caller must hold
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* sufficient locks/counts to ensure that their existing reference cannot
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* go away
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*/
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static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
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{
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if (tty)
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kref_get(&tty->kref);
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return tty;
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}
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const char *tty_driver_name(const struct tty_struct *tty);
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void tty_wait_until_sent(struct tty_struct *tty, long timeout);
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void stop_tty(struct tty_struct *tty);
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void start_tty(struct tty_struct *tty);
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void tty_write_message(struct tty_struct *tty, char *msg);
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int tty_send_xchar(struct tty_struct *tty, char ch);
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int tty_put_char(struct tty_struct *tty, unsigned char c);
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unsigned int tty_chars_in_buffer(struct tty_struct *tty);
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unsigned int tty_write_room(struct tty_struct *tty);
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void tty_driver_flush_buffer(struct tty_struct *tty);
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void tty_unthrottle(struct tty_struct *tty);
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int tty_throttle_safe(struct tty_struct *tty);
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int tty_unthrottle_safe(struct tty_struct *tty);
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int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
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int tty_get_icount(struct tty_struct *tty,
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struct serial_icounter_struct *icount);
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int is_current_pgrp_orphaned(void);
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void tty_hangup(struct tty_struct *tty);
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void tty_vhangup(struct tty_struct *tty);
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int tty_hung_up_p(struct file *filp);
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void do_SAK(struct tty_struct *tty);
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void __do_SAK(struct tty_struct *tty);
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void no_tty(void);
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speed_t tty_termios_baud_rate(const struct ktermios *termios);
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void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud,
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|
speed_t obaud);
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void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud,
|
|
speed_t obaud);
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|
|
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/**
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* tty_get_baud_rate - get tty bit rates
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|
* @tty: tty to query
|
|
*
|
|
* Returns the baud rate as an integer for this terminal. The
|
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* termios lock must be held by the caller and the terminal bit
|
|
* flags may be updated.
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*
|
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* Locking: none
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|
*/
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static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
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|
{
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return tty_termios_baud_rate(&tty->termios);
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}
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unsigned char tty_get_char_size(unsigned int cflag);
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unsigned char tty_get_frame_size(unsigned int cflag);
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|
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void tty_termios_copy_hw(struct ktermios *new, const struct ktermios *old);
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bool tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b);
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int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
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|
|
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void tty_wakeup(struct tty_struct *tty);
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|
|
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int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
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int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
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struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
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|
void tty_release_struct(struct tty_struct *tty, int idx);
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|
void tty_init_termios(struct tty_struct *tty);
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|
void tty_save_termios(struct tty_struct *tty);
|
|
int tty_standard_install(struct tty_driver *driver,
|
|
struct tty_struct *tty);
|
|
|
|
extern struct mutex tty_mutex;
|
|
|
|
/* n_tty.c */
|
|
void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
|
|
#ifdef CONFIG_TTY
|
|
void __init n_tty_init(void);
|
|
#else
|
|
static inline void n_tty_init(void) { }
|
|
#endif
|
|
|
|
/* tty_audit.c */
|
|
#ifdef CONFIG_AUDIT
|
|
void tty_audit_exit(void);
|
|
void tty_audit_fork(struct signal_struct *sig);
|
|
int tty_audit_push(void);
|
|
#else
|
|
static inline void tty_audit_exit(void)
|
|
{
|
|
}
|
|
static inline void tty_audit_fork(struct signal_struct *sig)
|
|
{
|
|
}
|
|
static inline int tty_audit_push(void)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* tty_ioctl.c */
|
|
int n_tty_ioctl_helper(struct tty_struct *tty, unsigned int cmd,
|
|
unsigned long arg);
|
|
|
|
/* vt.c */
|
|
|
|
int vt_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
|
|
|
|
long vt_compat_ioctl(struct tty_struct *tty, unsigned int cmd,
|
|
unsigned long arg);
|
|
|
|
/* tty_mutex.c */
|
|
/* functions for preparation of BKL removal */
|
|
void tty_lock(struct tty_struct *tty);
|
|
int tty_lock_interruptible(struct tty_struct *tty);
|
|
void tty_unlock(struct tty_struct *tty);
|
|
void tty_lock_slave(struct tty_struct *tty);
|
|
void tty_unlock_slave(struct tty_struct *tty);
|
|
void tty_set_lock_subclass(struct tty_struct *tty);
|
|
|
|
#endif
|