mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 14:56:40 +07:00
f309532bf3
This reverts the tty layer change to use per-tty locking, because it's not correct yet, and fixing it will require some more deep surgery. The main revert isd29f3ef39b
("tty_lock: Localise the lock"), but there are several smaller commits that built upon it, they also get reverted here. The list of reverted commits is:fde86d3108
- tty: add lockdep annotations8f6576ad47
- tty: fix ldisc lock inversion traced3ca8b64b9
- pty: Fix lock inversionb1d679afd7
- tty: drop the pty lock during hangupabcefe5fc3
- tty/amiserial: Add missing argument for tty_unlock()fd11b42e35
- cris: fix missing tty arg in wait_event_interruptible_tty calld29f3ef39b
- tty_lock: Localise the lock The revert had a trivial conflict in the 68360serial.c staging driver that got removed in the meantime. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
673 lines
24 KiB
C
673 lines
24 KiB
C
#ifndef _LINUX_TTY_H
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#define _LINUX_TTY_H
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/*
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* 'tty.h' defines some structures used by tty_io.c and some defines.
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*/
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#define NR_LDISCS 30
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/* line disciplines */
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#define N_TTY 0
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#define N_SLIP 1
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#define N_MOUSE 2
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#define N_PPP 3
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#define N_STRIP 4
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#define N_AX25 5
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#define N_X25 6 /* X.25 async */
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#define N_6PACK 7
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#define N_MASC 8 /* Reserved for Mobitex module <kaz@cafe.net> */
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#define N_R3964 9 /* Reserved for Simatic R3964 module */
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#define N_PROFIBUS_FDL 10 /* Reserved for Profibus */
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#define N_IRDA 11 /* Linux IrDa - http://irda.sourceforge.net/ */
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#define N_SMSBLOCK 12 /* SMS block mode - for talking to GSM data */
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/* cards about SMS messages */
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#define N_HDLC 13 /* synchronous HDLC */
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#define N_SYNC_PPP 14 /* synchronous PPP */
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#define N_HCI 15 /* Bluetooth HCI UART */
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#define N_GIGASET_M101 16 /* Siemens Gigaset M101 serial DECT adapter */
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#define N_SLCAN 17 /* Serial / USB serial CAN Adaptors */
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#define N_PPS 18 /* Pulse per Second */
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#define N_V253 19 /* Codec control over voice modem */
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#define N_CAIF 20 /* CAIF protocol for talking to modems */
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#define N_GSM0710 21 /* GSM 0710 Mux */
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#define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */
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#define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */
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#define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */
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#ifdef __KERNEL__
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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_driver.h>
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#include <linux/tty_ldisc.h>
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#include <linux/mutex.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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struct tty_buffer {
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struct tty_buffer *next;
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char *char_buf_ptr;
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unsigned char *flag_buf_ptr;
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int used;
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int size;
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int commit;
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int read;
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/* Data points here */
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unsigned long data[0];
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};
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/*
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* We default to dicing tty buffer allocations to this many characters
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* in order to avoid multiple page allocations. We know the size of
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* tty_buffer itself but it must also be taken into account that the
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* the buffer is 256 byte aligned. See tty_buffer_find for the allocation
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* logic this must match
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*/
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#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
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struct tty_bufhead {
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struct work_struct work;
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spinlock_t lock;
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struct tty_buffer *head; /* Queue head */
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struct tty_buffer *tail; /* Active buffer */
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struct tty_buffer *free; /* Free queue head */
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int memory_used; /* Buffer space used excluding
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free queue */
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};
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/*
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* When a break, frame error, or parity error happens, these codes are
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* stuffed into the flags buffer.
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*/
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#define TTY_NORMAL 0
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#define TTY_BREAK 1
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#define TTY_FRAME 2
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#define TTY_PARITY 3
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#define TTY_OVERRUN 4
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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 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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/*
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* Port level information. Each device keeps its own port level information
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* so provide a common structure for those ports wanting to use common support
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* routines.
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*
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* The tty port has a different lifetime to the tty so must be kept apart.
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* In addition be careful as tty -> port mappings are valid for the life
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* of the tty object but in many cases port -> tty mappings are valid only
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* until a hangup so don't use the wrong path.
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*/
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struct tty_port;
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struct tty_port_operations {
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/* Return 1 if the carrier is raised */
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int (*carrier_raised)(struct tty_port *port);
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/* Control the DTR line */
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void (*dtr_rts)(struct tty_port *port, int raise);
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/* Called when the last close completes or a hangup finishes
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IFF the port was initialized. Do not use to free resources. Called
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under the port mutex to serialize against activate/shutdowns */
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void (*shutdown)(struct tty_port *port);
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void (*drop)(struct tty_port *port);
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/* Called under the port mutex from tty_port_open, serialized using
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the port mutex */
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/* FIXME: long term getting the tty argument *out* of this would be
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good for consoles */
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int (*activate)(struct tty_port *port, struct tty_struct *tty);
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/* Called on the final put of a port */
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void (*destruct)(struct tty_port *port);
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};
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struct tty_port {
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struct tty_struct *tty; /* Back pointer */
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const struct tty_port_operations *ops; /* Port operations */
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spinlock_t lock; /* Lock protecting tty field */
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int blocked_open; /* Waiting to open */
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int count; /* Usage count */
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wait_queue_head_t open_wait; /* Open waiters */
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wait_queue_head_t close_wait; /* Close waiters */
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wait_queue_head_t delta_msr_wait; /* Modem status change */
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unsigned long flags; /* TTY flags ASY_*/
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unsigned char console:1; /* port is a console */
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struct mutex mutex; /* Locking */
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struct mutex buf_mutex; /* Buffer alloc lock */
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unsigned char *xmit_buf; /* Optional buffer */
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unsigned int close_delay; /* Close port delay */
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unsigned int closing_wait; /* Delay for output */
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int drain_delay; /* Set to zero if no pure time
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based drain is needed else
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set to size of fifo */
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struct kref kref; /* Ref counter */
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};
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/*
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* Where all of the state associated with a tty is kept while the tty
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* is open. Since the termios state should be kept even if the tty
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* has been closed --- for things like the baud rate, etc --- it is
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* not stored here, but rather a pointer to the real state is stored
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* here. Possible the winsize structure should have the same
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* treatment, but (1) the default 80x24 is usually right and (2) it's
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* most often used by a windowing system, which will set the correct
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* size each time the window is created or resized anyway.
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* - TYT, 9/14/92
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*/
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struct tty_operations;
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struct tty_struct {
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int magic;
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struct kref kref;
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struct device *dev;
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struct tty_driver *driver;
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const struct tty_operations *ops;
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int index;
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/* Protects ldisc changes: Lock tty not pty */
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struct mutex ldisc_mutex;
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struct tty_ldisc *ldisc;
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struct mutex termios_mutex;
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spinlock_t ctrl_lock;
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/* Termios values are protected by the termios mutex */
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struct ktermios *termios, *termios_locked;
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struct termiox *termiox; /* May be NULL for unsupported */
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char name[64];
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struct pid *pgrp; /* Protected by ctrl lock */
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struct pid *session;
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unsigned long flags;
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int count;
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struct winsize winsize; /* termios mutex */
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unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
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unsigned char low_latency:1, warned:1;
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unsigned char ctrl_status; /* ctrl_lock */
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unsigned int receive_room; /* Bytes free for queue */
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struct tty_struct *link;
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struct fasync_struct *fasync;
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struct tty_bufhead buf; /* Locked internally */
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int alt_speed; /* For magic substitution of 38400 bps */
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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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struct list_head tty_files;
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#define N_TTY_BUF_SIZE 4096
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/*
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* The following is data for the N_TTY line discipline. For
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* historical reasons, this is included in the tty structure.
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* Mostly locked by the BKL.
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*/
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unsigned int column;
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unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
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unsigned char closing:1;
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unsigned char echo_overrun:1;
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unsigned short minimum_to_wake;
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unsigned long overrun_time;
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int num_overrun;
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unsigned long process_char_map[256/(8*sizeof(unsigned long))];
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char *read_buf;
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int read_head;
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int read_tail;
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int read_cnt;
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unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
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unsigned char *echo_buf;
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unsigned int echo_pos;
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unsigned int echo_cnt;
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int canon_data;
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unsigned long canon_head;
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unsigned int canon_column;
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struct mutex atomic_read_lock;
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struct mutex atomic_write_lock;
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struct mutex output_lock;
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struct mutex echo_lock;
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unsigned char *write_buf;
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int write_cnt;
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spinlock_t read_lock;
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/* If the tty has a pending do_SAK, queue it here - akpm */
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struct work_struct SAK_work;
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struct tty_port *port;
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};
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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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/* tty magic number */
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#define TTY_MAGIC 0x5401
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/*
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* These bits are used in the flags field of the tty structure.
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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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#define TTY_THROTTLED 0 /* Call unthrottle() at threshold min */
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#define TTY_IO_ERROR 1 /* Cause an I/O error (may be no ldisc too) */
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#define TTY_OTHER_CLOSED 2 /* Other side (if any) has closed */
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#define TTY_EXCLUSIVE 3 /* Exclusive open mode */
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#define TTY_DEBUG 4 /* Debugging */
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#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
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#define TTY_PUSH 6 /* n_tty private */
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#define TTY_CLOSING 7 /* ->close() in progress */
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#define TTY_LDISC 9 /* Line discipline attached */
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#define TTY_LDISC_CHANGING 10 /* Line discipline changing */
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#define TTY_LDISC_OPEN 11 /* Line discipline is open */
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#define TTY_HW_COOK_OUT 14 /* Hardware can do output cooking */
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#define TTY_HW_COOK_IN 15 /* Hardware can do input cooking */
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#define TTY_PTY_LOCK 16 /* pty private */
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#define TTY_NO_WRITE_SPLIT 17 /* Preserve write boundaries to driver */
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#define TTY_HUPPED 18 /* Post driver->hangup() */
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#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
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#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
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#define TTY_HUPPING 21 /* ->hangup() in progress */
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#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
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extern void tty_write_flush(struct tty_struct *);
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extern struct ktermios tty_std_termios;
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extern void console_init(void);
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extern int vcs_init(void);
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extern 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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extern void tty_kref_put(struct tty_struct *tty);
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extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
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const char *routine);
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extern char *tty_name(struct tty_struct *tty, char *buf);
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extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
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extern int tty_check_change(struct tty_struct *tty);
|
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extern void stop_tty(struct tty_struct *tty);
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extern void start_tty(struct tty_struct *tty);
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extern int tty_register_driver(struct tty_driver *driver);
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extern int tty_unregister_driver(struct tty_driver *driver);
|
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extern struct device *tty_register_device(struct tty_driver *driver,
|
|
unsigned index, struct device *dev);
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extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
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extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
|
|
int buflen);
|
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extern void tty_write_message(struct tty_struct *tty, char *msg);
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extern int tty_put_char(struct tty_struct *tty, unsigned char c);
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extern int tty_chars_in_buffer(struct tty_struct *tty);
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extern int tty_write_room(struct tty_struct *tty);
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extern void tty_driver_flush_buffer(struct tty_struct *tty);
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extern void tty_throttle(struct tty_struct *tty);
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extern void tty_unthrottle(struct tty_struct *tty);
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extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
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extern void tty_driver_remove_tty(struct tty_driver *driver,
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|
struct tty_struct *tty);
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extern void tty_shutdown(struct tty_struct *tty);
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extern void tty_free_termios(struct tty_struct *tty);
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extern int is_current_pgrp_orphaned(void);
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extern struct pid *tty_get_pgrp(struct tty_struct *tty);
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extern int is_ignored(int sig);
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extern int tty_signal(int sig, struct tty_struct *tty);
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extern void tty_hangup(struct tty_struct *tty);
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extern void tty_vhangup(struct tty_struct *tty);
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extern void tty_vhangup_locked(struct tty_struct *tty);
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extern void tty_vhangup_self(void);
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extern void tty_unhangup(struct file *filp);
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extern int tty_hung_up_p(struct file *filp);
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extern void do_SAK(struct tty_struct *tty);
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extern void __do_SAK(struct tty_struct *tty);
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extern void disassociate_ctty(int priv);
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extern void no_tty(void);
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extern void tty_flip_buffer_push(struct tty_struct *tty);
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extern void tty_flush_to_ldisc(struct tty_struct *tty);
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extern void tty_buffer_free_all(struct tty_struct *tty);
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extern void tty_buffer_flush(struct tty_struct *tty);
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extern void tty_buffer_init(struct tty_struct *tty);
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extern speed_t tty_get_baud_rate(struct tty_struct *tty);
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extern speed_t tty_termios_baud_rate(struct ktermios *termios);
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extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
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extern void tty_termios_encode_baud_rate(struct ktermios *termios,
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speed_t ibaud, speed_t obaud);
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extern void tty_encode_baud_rate(struct tty_struct *tty,
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|
speed_t ibaud, speed_t obaud);
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extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
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extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
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extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
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|
|
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extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
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extern void tty_ldisc_deref(struct tty_ldisc *);
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extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
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extern void tty_ldisc_hangup(struct tty_struct *tty);
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extern const struct file_operations tty_ldiscs_proc_fops;
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|
|
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extern void tty_wakeup(struct tty_struct *tty);
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extern void tty_ldisc_flush(struct tty_struct *tty);
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|
|
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extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg);
|
|
extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
|
|
extern dev_t tty_devnum(struct tty_struct *tty);
|
|
extern void proc_clear_tty(struct task_struct *p);
|
|
extern struct tty_struct *get_current_tty(void);
|
|
extern void tty_default_fops(struct file_operations *fops);
|
|
extern struct tty_struct *alloc_tty_struct(void);
|
|
extern int tty_alloc_file(struct file *file);
|
|
extern void tty_add_file(struct tty_struct *tty, struct file *file);
|
|
extern void tty_free_file(struct file *file);
|
|
extern void free_tty_struct(struct tty_struct *tty);
|
|
extern void initialize_tty_struct(struct tty_struct *tty,
|
|
struct tty_driver *driver, int idx);
|
|
extern void deinitialize_tty_struct(struct tty_struct *tty);
|
|
extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
|
|
extern int tty_release(struct inode *inode, struct file *filp);
|
|
extern int tty_init_termios(struct tty_struct *tty);
|
|
extern int tty_standard_install(struct tty_driver *driver,
|
|
struct tty_struct *tty);
|
|
|
|
extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
|
|
extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
|
|
|
|
extern struct mutex tty_mutex;
|
|
extern spinlock_t tty_files_lock;
|
|
|
|
extern void tty_write_unlock(struct tty_struct *tty);
|
|
extern int tty_write_lock(struct tty_struct *tty, int ndelay);
|
|
#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
|
|
|
|
extern void tty_port_init(struct tty_port *port);
|
|
extern int tty_port_alloc_xmit_buf(struct tty_port *port);
|
|
extern void tty_port_free_xmit_buf(struct tty_port *port);
|
|
extern void tty_port_put(struct tty_port *port);
|
|
|
|
static inline struct tty_port *tty_port_get(struct tty_port *port)
|
|
{
|
|
if (port)
|
|
kref_get(&port->kref);
|
|
return port;
|
|
}
|
|
|
|
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
|
|
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
|
|
extern int tty_port_carrier_raised(struct tty_port *port);
|
|
extern void tty_port_raise_dtr_rts(struct tty_port *port);
|
|
extern void tty_port_lower_dtr_rts(struct tty_port *port);
|
|
extern void tty_port_hangup(struct tty_port *port);
|
|
extern int tty_port_block_til_ready(struct tty_port *port,
|
|
struct tty_struct *tty, struct file *filp);
|
|
extern int tty_port_close_start(struct tty_port *port,
|
|
struct tty_struct *tty, struct file *filp);
|
|
extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
|
|
extern void tty_port_close(struct tty_port *port,
|
|
struct tty_struct *tty, struct file *filp);
|
|
extern int tty_port_open(struct tty_port *port,
|
|
struct tty_struct *tty, struct file *filp);
|
|
static inline int tty_port_users(struct tty_port *port)
|
|
{
|
|
return port->count + port->blocked_open;
|
|
}
|
|
|
|
extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
|
|
extern int tty_unregister_ldisc(int disc);
|
|
extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
|
|
extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
|
|
extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
|
|
extern void tty_ldisc_init(struct tty_struct *tty);
|
|
extern void tty_ldisc_deinit(struct tty_struct *tty);
|
|
extern void tty_ldisc_begin(void);
|
|
/* This last one is just for the tty layer internals and shouldn't be used elsewhere */
|
|
extern void tty_ldisc_enable(struct tty_struct *tty);
|
|
|
|
|
|
/* n_tty.c */
|
|
extern struct tty_ldisc_ops tty_ldisc_N_TTY;
|
|
extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
|
|
|
|
/* tty_audit.c */
|
|
#ifdef CONFIG_AUDIT
|
|
extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
|
|
size_t size);
|
|
extern void tty_audit_exit(void);
|
|
extern void tty_audit_fork(struct signal_struct *sig);
|
|
extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
|
|
extern void tty_audit_push(struct tty_struct *tty);
|
|
extern int tty_audit_push_task(struct task_struct *tsk,
|
|
uid_t loginuid, u32 sessionid);
|
|
#else
|
|
static inline void tty_audit_add_data(struct tty_struct *tty,
|
|
unsigned char *data, size_t size)
|
|
{
|
|
}
|
|
static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
|
|
{
|
|
}
|
|
static inline void tty_audit_exit(void)
|
|
{
|
|
}
|
|
static inline void tty_audit_fork(struct signal_struct *sig)
|
|
{
|
|
}
|
|
static inline void tty_audit_push(struct tty_struct *tty)
|
|
{
|
|
}
|
|
static inline int tty_audit_push_task(struct task_struct *tsk,
|
|
uid_t loginuid, u32 sessionid)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* tty_io.c */
|
|
extern int __init tty_init(void);
|
|
|
|
/* tty_ioctl.c */
|
|
extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg);
|
|
extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg);
|
|
|
|
/* serial.c */
|
|
|
|
extern void serial_console_init(void);
|
|
|
|
/* pcxx.c */
|
|
|
|
extern int pcxe_open(struct tty_struct *tty, struct file *filp);
|
|
|
|
/* vt.c */
|
|
|
|
extern int vt_ioctl(struct tty_struct *tty,
|
|
unsigned int cmd, unsigned long arg);
|
|
|
|
extern long vt_compat_ioctl(struct tty_struct *tty,
|
|
unsigned int cmd, unsigned long arg);
|
|
|
|
/* tty_mutex.c */
|
|
/* functions for preparation of BKL removal */
|
|
extern void __lockfunc tty_lock(void) __acquires(tty_lock);
|
|
extern void __lockfunc tty_unlock(void) __releases(tty_lock);
|
|
|
|
/*
|
|
* this shall be called only from where BTM is held (like close)
|
|
*
|
|
* We need this to ensure nobody waits for us to finish while we are waiting.
|
|
* Without this we were encountering system stalls.
|
|
*
|
|
* This should be indeed removed with BTM removal later.
|
|
*
|
|
* Locking: BTM required. Nobody is allowed to hold port->mutex.
|
|
*/
|
|
static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
|
|
long timeout)
|
|
{
|
|
tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */
|
|
tty_wait_until_sent(tty, timeout);
|
|
tty_lock();
|
|
}
|
|
|
|
/*
|
|
* wait_event_interruptible_tty -- wait for a condition with the tty lock held
|
|
*
|
|
* The condition we are waiting for might take a long time to
|
|
* become true, or might depend on another thread taking the
|
|
* BTM. In either case, we need to drop the BTM to guarantee
|
|
* forward progress. This is a leftover from the conversion
|
|
* from the BKL and should eventually get removed as the BTM
|
|
* falls out of use.
|
|
*
|
|
* Do not use in new code.
|
|
*/
|
|
#define wait_event_interruptible_tty(wq, condition) \
|
|
({ \
|
|
int __ret = 0; \
|
|
if (!(condition)) { \
|
|
__wait_event_interruptible_tty(wq, condition, __ret); \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
#define __wait_event_interruptible_tty(wq, condition, ret) \
|
|
do { \
|
|
DEFINE_WAIT(__wait); \
|
|
\
|
|
for (;;) { \
|
|
prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
|
|
if (condition) \
|
|
break; \
|
|
if (!signal_pending(current)) { \
|
|
tty_unlock(); \
|
|
schedule(); \
|
|
tty_lock(); \
|
|
continue; \
|
|
} \
|
|
ret = -ERESTARTSYS; \
|
|
break; \
|
|
} \
|
|
finish_wait(&wq, &__wait); \
|
|
} while (0)
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif
|