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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5ada918b82
The kernel offers with TIOCL_GETKMSGREDIRECT ioctl() the possibility to redirect the kernel messages to a specific console. However, since it's not possible to switch to the kernel message console after a panic(), it would be nice if the kernel would print the panic message on the current console. This patch series adds a new interface to access the global kmsg_redirect variable by a function to be able to use it in code where CONFIG_VT_CONSOLE is not set (kernel/panic.c). This patch: Instead of using and exporting a global value kmsg_redirect, introduce a function vt_kmsg_redirect() that both can set and return the console where messages are printed. Change all users of kmsg_redirect (the VT code itself and kernel/power.c) to the new interface. The main advantage is that vt_kmsg_redirect() can also be used when CONFIG_VT_CONSOLE is not set. Signed-off-by: Bernhard Walle <bernhard@bwalle.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
#ifndef _LINUX_VT_H
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#define _LINUX_VT_H
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/*
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* These constants are also useful for user-level apps (e.g., VC
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* resizing).
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*/
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#define MIN_NR_CONSOLES 1 /* must be at least 1 */
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#define MAX_NR_CONSOLES 63 /* serial lines start at 64 */
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#define MAX_NR_USER_CONSOLES 63 /* must be root to allocate above this */
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/* Note: the ioctl VT_GETSTATE does not work for
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consoles 16 and higher (since it returns a short) */
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/* 0x56 is 'V', to avoid collision with termios and kd */
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#define VT_OPENQRY 0x5600 /* find available vt */
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struct vt_mode {
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char mode; /* vt mode */
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char waitv; /* if set, hang on writes if not active */
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short relsig; /* signal to raise on release req */
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short acqsig; /* signal to raise on acquisition */
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short frsig; /* unused (set to 0) */
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};
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#define VT_GETMODE 0x5601 /* get mode of active vt */
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#define VT_SETMODE 0x5602 /* set mode of active vt */
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#define VT_AUTO 0x00 /* auto vt switching */
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#define VT_PROCESS 0x01 /* process controls switching */
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#define VT_ACKACQ 0x02 /* acknowledge switch */
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struct vt_stat {
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unsigned short v_active; /* active vt */
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unsigned short v_signal; /* signal to send */
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unsigned short v_state; /* vt bitmask */
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};
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#define VT_GETSTATE 0x5603 /* get global vt state info */
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#define VT_SENDSIG 0x5604 /* signal to send to bitmask of vts */
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#define VT_RELDISP 0x5605 /* release display */
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#define VT_ACTIVATE 0x5606 /* make vt active */
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#define VT_WAITACTIVE 0x5607 /* wait for vt active */
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#define VT_DISALLOCATE 0x5608 /* free memory associated to vt */
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struct vt_sizes {
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unsigned short v_rows; /* number of rows */
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unsigned short v_cols; /* number of columns */
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unsigned short v_scrollsize; /* number of lines of scrollback */
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};
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#define VT_RESIZE 0x5609 /* set kernel's idea of screensize */
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struct vt_consize {
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unsigned short v_rows; /* number of rows */
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unsigned short v_cols; /* number of columns */
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unsigned short v_vlin; /* number of pixel rows on screen */
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unsigned short v_clin; /* number of pixel rows per character */
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unsigned short v_vcol; /* number of pixel columns on screen */
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unsigned short v_ccol; /* number of pixel columns per character */
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};
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#define VT_RESIZEX 0x560A /* set kernel's idea of screensize + more */
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#define VT_LOCKSWITCH 0x560B /* disallow vt switching */
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#define VT_UNLOCKSWITCH 0x560C /* allow vt switching */
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#define VT_GETHIFONTMASK 0x560D /* return hi font mask */
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struct vt_event {
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unsigned int event;
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#define VT_EVENT_SWITCH 0x0001 /* Console switch */
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#define VT_EVENT_BLANK 0x0002 /* Screen blank */
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#define VT_EVENT_UNBLANK 0x0004 /* Screen unblank */
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#define VT_EVENT_RESIZE 0x0008 /* Resize display */
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#define VT_MAX_EVENT 0x000F
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unsigned int oldev; /* Old console */
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unsigned int newev; /* New console (if changing) */
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unsigned int pad[4]; /* Padding for expansion */
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};
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#define VT_WAITEVENT 0x560E /* Wait for an event */
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struct vt_setactivate {
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unsigned int console;
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struct vt_mode mode;
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};
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#define VT_SETACTIVATE 0x560F /* Activate and set the mode of a console */
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#ifdef CONFIG_VT_CONSOLE
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extern int vt_kmsg_redirect(int new);
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#else
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static inline int vt_kmsg_redirect(int new)
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{
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return 0;
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}
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#endif
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#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
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#endif /* _LINUX_VT_H */
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