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
235 lines
6.7 KiB
C
235 lines
6.7 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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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* 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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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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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/kernel.h>
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#include <sys/eventhandler.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/unistd.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sbuf.h>
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#include <sys/sched.h>
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#include <sys/sx.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
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struct sx topology_lock;
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static struct proc *g_proc;
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static struct thread *g_up_td;
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static struct thread *g_down_td;
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static struct thread *g_event_td;
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int g_debugflags;
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int g_collectstats = 1;
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int g_shutdown;
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int g_notaste;
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/*
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* G_UP and G_DOWN are the two threads which push I/O through the
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* stack.
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*
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* Things are procesed in a FIFO order, but these threads could be
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* part of I/O prioritization by deciding which bios/bioqs to service
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* in what order.
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*
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* We have only one thread in each direction, it is belived that until
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* a very non-trivial workload in the UP/DOWN path this will be enough,
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* but more than one can actually be run without problems.
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*
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* Holding the "mymutex" is a debugging feature: It prevents people
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* from sleeping in the UP/DOWN I/O path by mistake or design (doing
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* so almost invariably result in deadlocks since it stalls all I/O
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* processing in the given direction.
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*/
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static void
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g_up_procbody(void *arg)
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{
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mtx_assert(&Giant, MA_NOTOWNED);
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thread_lock(g_up_td);
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sched_prio(g_up_td, PRIBIO);
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thread_unlock(g_up_td);
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for(;;) {
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g_io_schedule_up(g_up_td);
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}
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}
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static void
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g_down_procbody(void *arg)
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{
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mtx_assert(&Giant, MA_NOTOWNED);
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thread_lock(g_down_td);
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sched_prio(g_down_td, PRIBIO);
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thread_unlock(g_down_td);
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for(;;) {
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g_io_schedule_down(g_down_td);
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}
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}
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static void
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g_event_procbody(void *arg)
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{
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mtx_assert(&Giant, MA_NOTOWNED);
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thread_lock(g_event_td);
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sched_prio(g_event_td, PRIBIO);
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thread_unlock(g_event_td);
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g_run_events();
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/* NOTREACHED */
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}
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int
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g_is_geom_thread(struct thread *td)
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{
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return (td == g_up_td || td == g_down_td || td == g_event_td);
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}
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static void
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geom_shutdown(void *foo __unused)
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{
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g_shutdown = 1;
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}
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void
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g_init(void)
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{
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g_trace(G_T_TOPOLOGY, "g_ignition");
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sx_init(&topology_lock, "GEOM topology");
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g_io_init();
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g_event_init();
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g_ctl_init();
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mtx_lock(&Giant);
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kproc_kthread_add(g_event_procbody, NULL, &g_proc, &g_event_td,
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RFHIGHPID, 0, "geom", "g_event");
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kproc_kthread_add(g_up_procbody, NULL, &g_proc, &g_up_td,
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RFHIGHPID, 0, "geom", "g_up");
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kproc_kthread_add(g_down_procbody, NULL, &g_proc, &g_down_td,
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RFHIGHPID, 0, "geom", "g_down");
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mtx_unlock(&Giant);
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EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
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SHUTDOWN_PRI_FIRST);
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}
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static int
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sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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sb = sbuf_new_auto();
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g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL);
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
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sbuf_delete(sb);
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return error;
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}
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static int
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sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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sb = sbuf_new_auto();
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g_waitfor_event(g_confdot, sb, M_WAITOK, NULL);
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
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sbuf_delete(sb);
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return error;
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}
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static int
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sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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sb = sbuf_new_auto();
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g_waitfor_event(g_confxml, sb, M_WAITOK, NULL);
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
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sbuf_delete(sb);
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return error;
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}
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SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
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SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_confxml, "",
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"Dump the GEOM config in XML");
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SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_confdot, "",
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"Dump the GEOM config in dot");
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SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_conftxt, "",
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"Dump the GEOM config in txt");
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SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RWTUN,
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&g_debugflags, 0, "Set various trace levels for GEOM debugging");
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SYSCTL_INT(_kern_geom, OID_AUTO, notaste, CTLFLAG_RW,
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&g_notaste, 0, "Prevent GEOM tasting");
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SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
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&g_collectstats, 0,
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"Control statistics collection on GEOM providers and consumers");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
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0, sizeof(struct g_class), "sizeof(struct g_class)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
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0, sizeof(struct g_geom), "sizeof(struct g_geom)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
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0, sizeof(struct g_provider), "sizeof(struct g_provider)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
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0, sizeof(struct g_consumer), "sizeof(struct g_consumer)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
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0, sizeof(struct g_bioq), "sizeof(struct g_bioq)");
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