4995f8ef9d
During bootup performance tracing I noticed many occurrences of vca* device creation and removal, leading to the usual userspace uevent processing, which are, in this case, rather pointless. A simple test showing the kernel timing (not including all the work userspace has to do), gives us these numbers: $ time for i in `seq 1000`; do echo a > /dev/tty2; done real 0m1.142s user 0m0.015s sys 0m0.540s If we move the hook for the vcs* driver core devices from the tty "binding" to the vc allocation/deallocation, which is what the vcs* devices represent, we get the following numbers: $ time for i in `seq 1000`; do echo a > /dev/tty2; done real 0m0.152s user 0m0.030s sys 0m0.072s Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
161 lines
5.2 KiB
C
161 lines
5.2 KiB
C
/*
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* linux/include/linux/console.h
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*
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* Copyright (C) 1993 Hamish Macdonald
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*
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* Changed:
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* 10-Mar-94: Arno Griffioen: Conversion for vt100 emulator port from PC LINUX
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*/
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#ifndef _LINUX_CONSOLE_H_
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#define _LINUX_CONSOLE_H_ 1
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#include <linux/types.h>
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struct vc_data;
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struct console_font_op;
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struct console_font;
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struct module;
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struct tty_struct;
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/*
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* this is what the terminal answers to a ESC-Z or csi0c query.
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*/
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#define VT100ID "\033[?1;2c"
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#define VT102ID "\033[?6c"
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struct consw {
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struct module *owner;
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const char *(*con_startup)(void);
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void (*con_init)(struct vc_data *, int);
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void (*con_deinit)(struct vc_data *);
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void (*con_clear)(struct vc_data *, int, int, int, int);
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void (*con_putc)(struct vc_data *, int, int, int);
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void (*con_putcs)(struct vc_data *, const unsigned short *, int, int, int);
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void (*con_cursor)(struct vc_data *, int);
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int (*con_scroll)(struct vc_data *, int, int, int, int);
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void (*con_bmove)(struct vc_data *, int, int, int, int, int, int);
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int (*con_switch)(struct vc_data *);
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int (*con_blank)(struct vc_data *, int, int);
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int (*con_font_set)(struct vc_data *, struct console_font *, unsigned);
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int (*con_font_get)(struct vc_data *, struct console_font *);
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int (*con_font_default)(struct vc_data *, struct console_font *, char *);
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int (*con_font_copy)(struct vc_data *, int);
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int (*con_resize)(struct vc_data *, unsigned int, unsigned int,
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unsigned int);
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int (*con_set_palette)(struct vc_data *, unsigned char *);
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int (*con_scrolldelta)(struct vc_data *, int);
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int (*con_set_origin)(struct vc_data *);
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void (*con_save_screen)(struct vc_data *);
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u8 (*con_build_attr)(struct vc_data *, u8, u8, u8, u8, u8, u8);
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void (*con_invert_region)(struct vc_data *, u16 *, int);
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u16 *(*con_screen_pos)(struct vc_data *, int);
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unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *);
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};
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extern const struct consw *conswitchp;
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extern const struct consw dummy_con; /* dummy console buffer */
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extern const struct consw vga_con; /* VGA text console */
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extern const struct consw newport_con; /* SGI Newport console */
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extern const struct consw prom_con; /* SPARC PROM console */
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int con_is_bound(const struct consw *csw);
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int register_con_driver(const struct consw *csw, int first, int last);
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int unregister_con_driver(const struct consw *csw);
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int take_over_console(const struct consw *sw, int first, int last, int deflt);
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void give_up_console(const struct consw *sw);
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/* scroll */
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#define SM_UP (1)
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#define SM_DOWN (2)
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/* cursor */
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#define CM_DRAW (1)
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#define CM_ERASE (2)
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#define CM_MOVE (3)
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/*
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* The interface for a console, or any other device that wants to capture
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* console messages (printer driver?)
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*
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* If a console driver is marked CON_BOOT then it will be auto-unregistered
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* when the first real console is registered. This is for early-printk drivers.
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*/
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#define CON_PRINTBUFFER (1)
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#define CON_CONSDEV (2) /* Last on the command line */
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#define CON_ENABLED (4)
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#define CON_BOOT (8)
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#define CON_ANYTIME (16) /* Safe to call when cpu is offline */
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#define CON_BRL (32) /* Used for a braille device */
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struct console {
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char name[16];
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void (*write)(struct console *, const char *, unsigned);
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int (*read)(struct console *, char *, unsigned);
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struct tty_driver *(*device)(struct console *, int *);
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void (*unblank)(void);
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int (*setup)(struct console *, char *);
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int (*early_setup)(void);
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short flags;
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short index;
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int cflag;
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void *data;
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struct console *next;
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};
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extern int console_set_on_cmdline;
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extern int add_preferred_console(char *name, int idx, char *options);
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extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options);
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extern void register_console(struct console *);
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extern int unregister_console(struct console *);
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extern struct console *console_drivers;
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extern void acquire_console_sem(void);
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extern int try_acquire_console_sem(void);
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extern void release_console_sem(void);
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extern void console_conditional_schedule(void);
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extern void console_unblank(void);
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extern struct tty_driver *console_device(int *);
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extern void console_stop(struct console *);
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extern void console_start(struct console *);
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extern int is_console_locked(void);
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extern int braille_register_console(struct console *, int index,
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char *console_options, char *braille_options);
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extern int braille_unregister_console(struct console *);
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extern int console_suspend_enabled;
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/* Suspend and resume console messages over PM events */
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extern void suspend_console(void);
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extern void resume_console(void);
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int mda_console_init(void);
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void prom_con_init(void);
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void vcs_make_sysfs(int index);
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void vcs_remove_sysfs(int index);
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/* Some debug stub to catch some of the obvious races in the VT code */
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#if 1
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#define WARN_CONSOLE_UNLOCKED() WARN_ON(!is_console_locked() && !oops_in_progress)
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#else
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#define WARN_CONSOLE_UNLOCKED()
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#endif
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/* VESA Blanking Levels */
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#define VESA_NO_BLANKING 0
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#define VESA_VSYNC_SUSPEND 1
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#define VESA_HSYNC_SUSPEND 2
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#define VESA_POWERDOWN 3
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#ifdef CONFIG_VGA_CONSOLE
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extern bool vgacon_text_force(void);
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#endif
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#endif /* _LINUX_CONSOLE_H */
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