3da1cf1e88
there is an environment variable which shall initialize the SYSCTL during early boot. This works for all SYSCTL types both statically and dynamically created ones, except for the SYSCTL NODE type and SYSCTLs which belong to VNETs. A new flag, CTLFLAG_NOFETCH, has been added to be used in the case a tunable sysctl has a custom initialisation function allowing the sysctl to still be marked as a tunable. The kernel SYSCTL API is mostly the same, with a few exceptions for some special operations like iterating childrens of a static/extern SYSCTL node. This operation should probably be made into a factored out common macro, hence some device drivers use this. The reason for changing the SYSCTL API was the need for a SYSCTL parent OID pointer and not only the SYSCTL parent OID list pointer in order to quickly generate the sysctl path. The motivation behind this patch is to avoid parameter loading cludges inside the OFED driver subsystem. Instead of adding special code to the OFED driver subsystem to post-load tunables into dynamically created sysctls, we generalize this in the kernel. Other changes: - Corrected a possibly incorrect sysctl name from "hw.cbb.intr_mask" to "hw.pcic.intr_mask". - Removed redundant TUNABLE statements throughout the kernel. - Some minor code rewrites in connection to removing not needed TUNABLE statements. - Added a missing SYSCTL_DECL(). - Wrapped two very long lines. - Avoid malloc()/free() inside sysctl string handling, in case it is called to initialize a sysctl from a tunable, hence malloc()/free() is not ready when sysctls from the sysctl dataset are registered. - Bumped FreeBSD version to indicate SYSCTL API change. MFC after: 2 weeks Sponsored by: Mellanox Technologies
185 lines
4.4 KiB
C
185 lines
4.4 KiB
C
/*-
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* Copyright (c) 2006 Sam Leffler
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Support for redirecting console msgs to gdb. We register
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* a pseudo console to hook cnputc and send stuff to the gdb
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* port. The only trickiness here is buffering output so this
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* isn't dog slow.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/cons.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/reboot.h>
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#include <sys/sysctl.h>
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#include <machine/gdb_machdep.h>
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#include <machine/kdb.h>
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#include <gdb/gdb.h>
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#include <gdb/gdb_int.h>
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struct gdbcons {
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int npending;
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/* /2 for hex conversion, -6 for protocol glue */
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char buf[GDB_BUFSZ/2 - 6];
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struct callout flush;
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};
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static struct gdbcons state = { -1 };
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static int gdbcons_enable = 0;
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SYSCTL_INT(_debug, OID_AUTO, gdbcons, CTLFLAG_RWTUN, &gdbcons_enable,
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0, "copy console messages to GDB");
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static void
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gdb_cnprobe(struct consdev *cp)
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{
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sprintf(cp->cn_name, "gdb");
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cp->cn_pri = CN_LOW; /* XXX no way to say "write only" */
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}
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static void
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gdb_cninit(struct consdev *cp)
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{
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struct gdbcons *c = &state;
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/* setup tx buffer and callout */
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if (c->npending == -1) {
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c->npending = 0;
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callout_init(&c->flush, CALLOUT_MPSAFE);
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cp->cn_arg = c;
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}
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}
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static void
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gdb_cnterm(struct consdev *cp)
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{
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}
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static void
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gdb_cngrab(struct consdev *cp)
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{
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}
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static void
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gdb_cnungrab(struct consdev *cp)
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{
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}
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static int
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gdb_cngetc(struct consdev *cp)
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{
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return -1;
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}
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static void
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gdb_tx_puthex(int c)
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{
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const char *hex = "0123456789abcdef";
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gdb_tx_char(hex[(c>>4)&0xf]);
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gdb_tx_char(hex[(c>>0)&0xf]);
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}
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static void
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gdb_cnflush(void *arg)
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{
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struct gdbcons *gc = arg;
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int i;
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gdb_tx_begin('O');
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for (i = 0; i < gc->npending; i++)
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gdb_tx_puthex(gc->buf[i]);
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gdb_tx_end();
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gc->npending = 0;
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}
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/*
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* This glop is to figure out when it's safe to use callouts
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* to defer buffer flushing. There's probably a better way
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* and/or an earlier point in the boot process when it's ok.
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*/
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static int calloutok = 0;
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static void
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oktousecallout(void *data __unused)
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{
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calloutok = 1;
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}
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SYSINIT(gdbhack, SI_SUB_LAST, SI_ORDER_MIDDLE, oktousecallout, NULL);
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static void
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gdb_cnputc(struct consdev *cp, int c)
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{
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struct gdbcons *gc;
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if (gdbcons_enable && gdb_cur != NULL && gdb_listening) {
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gc = cp->cn_arg;
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if (gc->npending != 0) {
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/*
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* Cancel any pending callout and flush the
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* buffer if there's no space for this byte.
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*/
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if (calloutok)
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callout_stop(&gc->flush);
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if (gc->npending == sizeof(gc->buf))
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gdb_cnflush(gc);
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}
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gc->buf[gc->npending++] = c;
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/*
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* Flush on end of line; this is especially helpful
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* during boot when we don't have callouts to flush
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* the buffer. Otherwise we defer flushing; a 1/4
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* second is a guess.
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*/
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if (c == '\n')
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gdb_cnflush(gc);
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else if (calloutok)
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callout_reset(&gc->flush, hz/4, gdb_cnflush, gc);
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}
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}
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CONSOLE_DRIVER(gdb);
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/*
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* Our console device only gets attached if the system is booted
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* with RB_MULTIPLE set so gdb_init also calls us to attach the
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* console so we're setup regardless.
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*/
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void
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gdb_consinit(void)
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{
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gdb_cnprobe(&gdb_consdev);
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gdb_cninit(&gdb_consdev);
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cnadd(&gdb_consdev);
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}
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