Commit Graph

153 Commits

Author SHA1 Message Date
Hans Petter Selasky
af3b2549c4 Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
Glen Barber
37a107a407 Revert r267961, r267973:
These changes prevent sysctl(8) from returning proper output,
such as:

 1) no output from sysctl(8)
 2) erroneously returning ENOMEM with tools like truss(1)
    or uname(1)
 truss: can not get etype: Cannot allocate memory
2014-06-27 22:05:21 +00:00
Hans Petter Selasky
3da1cf1e88 Extend the meaning of the CTLFLAG_TUN flag to automatically check if
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
2014-06-27 16:33:43 +00:00
Bryan Drewery
2809a6dfa4 Fix grammar error and trailing newline.
Submitted by:	danfe
MFC after:	3 days
2014-04-23 02:21:17 +00:00
Bryan Drewery
ae8959dd57 Combine similar code from vprintf(9) and log(9).
MFC after:	2 weeks
2014-03-14 01:17:11 +00:00
Ian Lepore
42c8459bed Rework the EARLY_PRINTF mechanism. Instead of defining a special eprintf()
routine, now a platform can provide a pointer to an early_putc() routine
which is used instead of cn_putc().  Control can be handed off from early
printf support to standard console support by NULLing out the pointer
during standard console init.

This leverages all the existing error reporting that uses printf calls,
such as panic() which can now be usefully employed even in early
platform init code (useful at least to those who maintain that code and
build kernels with EARLY_PRINTF defined).

Reviewed by:	imp, eadler
2014-02-12 00:53:38 +00:00
Warner Losh
26fbe13c56 Implement generic support for early printf. Thought I can't find the
paper trail now, this patch is similar to one posted for one of the
preliminary versions of a new armv6 port. I took them and made them
more generic. Option not enabled by default since each board/port has
to provide its own eputc, and possibly do other things as well...
2014-01-22 21:20:08 +00:00
Konstantin Belousov
8740a7112e Reduce the scope of the proctree_lock. If several processes cause
continuous calls to the uprintf(9), the proctree_lock could be
shared-locked for indefinite amount of time, starving exclusive
requests. Since proctree_lock is needed for fork() and exit(), this
effectively stops the machine.

While there, do the similar reduction for tprintf(9).

Reported and tested by: pho
Reviewed by:    ed
Sponsored by:   The FreeBSD Foundation
MFC after:	1 week
Approved by:	re (glebius)
2013-09-13 06:39:10 +00:00
Navdeep Parhar
34c916c6d2 Add a vtprintf. It is to tprintf what vprintf is to printf.
Reviewed by:	kib
2013-09-07 07:53:21 +00:00
Marcel Moolenaar
80f1c58b0a Fix double vision syndrome (read: double output) when in the
debugger without a panic.
2011-10-16 14:16:46 +00:00
Kenneth D. Merry
5e319c480c Set pca.p_bufr to NULL when we haven't allocated a buffer.
Otherwise, p_bufr is set to garbage on the stack, and if that garbage
happens to be non-NULL, and the TOLOG or TOCONS flag is set, putbuf()
will get called and attempt to fill the non-existent buffer.

This is really only relevant for tprintf() (and only when the priority is
not -1), but set it in uprintf() and ttyprintf() for completeness.

The next step, to avoid log buffer scrambling, would be to add the
PRINTF_BUFR_SIZE code to tprintf(), but this should prevent panics.

Submitted by:	rmacklem
Found by:	pho
2011-06-07 05:04:37 +00:00
Kenneth D. Merry
d42a4eb507 Fix apparent garbage in the message buffer.
While we have had a fix in place (options PRINTF_BUFR_SIZE=128) to fix
scrambled console output, the message buffer and syslog were still getting
log messages one character at a time.  While all of the characters still
made it into the log (courtesy of atomic operations), they were often
interleaved when there were multiple threads writing to the buffer at the
same time.

This fixes message buffer accesses to use buffering logic as well, so that
strings that are less than PRINTF_BUFR_SIZE will be put into the message
buffer atomically.  So now dmesg output should look the same as console
output.

subr_msgbuf.c:		Convert most message buffer calls to use a new spin
			lock instead of atomic variables in some places.

			Add a new routine, msgbuf_addstr(), that adds a
			NUL-terminated string to a message buffer.  This
			takes a priority argument, which allows us to
			eliminate some races (at least in the the string
			at a time case) that are present in the
			implementation of msglogchar().  (dangling and
			lastpri are static variables, and are subject to
			races when multiple callers are present.)

			msgbuf_addstr() also allows the caller to request
			that carriage returns be stripped out of the
			string.  This matches the behavior of msglogchar(),
			but in testing so far it doesn't appear that any
			newlines are being stripped out.  So the carriage
			return removal functionality may be a candidate
			for removal later on if further analysis shows
			that it isn't necessary.

subr_prf.c:		Add a new msglogstr() routine that calls
			msgbuf_logstr().

			Rename putcons() to putbuf().  This now handles
			buffered output to the message log as well as
			the console.  Also, remove the logic in putcons()
			(now putbuf()) that added a carriage return before
			a newline.  The console path was the only path that
			needed it, and cnputc() (called by cnputs())
			already adds a carriage return.  So this
			duplication resulted in kernel-generated console
			output lines ending in '\r''\r''\n'.

			Refactor putchar() to handle the new buffering
			scheme.

			Add buffering to log().

			Change log_console() to use msglogstr() instead of
			msglogchar().  Don't add extra newlines by default
			in log_console().  Hide that behavior behind a
			tunable/sysctl (kern.log_console_add_linefeed) for
			those who would like the old behavior.  The old
			behavior led to the insertion of extra newlines
			for log output for programs that print out a
			string, and then a trailing newline on a separate
			write.  (This is visible with dmesg -a.)

msgbuf.h:		Add a prototype for msgbuf_addstr().

			Add three new fields to struct msgbuf, msg_needsnl,
			msg_lastpri and msg_lock.  The first two are needed
			for log message functionality previously handled
			by msglogchar().  (Which is still active if
			buffering isn't enabled.)

			Include sys/lock.h and sys/mutex.h for the new
			mutex.

Reviewed by:	gibbs
2011-05-31 17:29:58 +00:00
Jung-uk Kim
4a82f10889 Use type-specific inline function imax() instead of deprecated macro MAX().
Prodded by:	bde
2010-07-12 15:32:45 +00:00
Jung-uk Kim
4624e08a59 Implement optional 'precision' for numbers. Previously, it was parsed but
ignored.  Some third-party modules (e.g., APCICA) prefer this format over
zero padding flag '0'.
2010-07-08 22:13:23 +00:00
Ed Schouten
ca1d2f657a Make /dev/klog and kern.msgbuf* MPSAFE.
Normally msgbufp is locked using Giant. Switch it to use the
msgbuf_lock. Instead of changing the tsleep() calls to msleep(), just
convert it to condvar(9).

In my opinion the locking around msgbuf_peekbytes() still remains
questionable. It looks like locks are dropped while performing copies of
multiple blocks to userspace, which may cause the msgbuf to be reset in
the mean time. At least getting it underneath from Giant should make it
a little easier for us to figure out how to solve that.

Reminded by:	rdivacky
2009-11-03 21:06:19 +00:00
Ed Schouten
91c3cbfe1f Remove redundant code in printf() and vprintf().
printf() and vprintf() are exactly the same, except the way arguments
are passed. Just like we see in other pieces of code (i.e. libc's
printf()), implement printf() using vprintf().

Submitted by:	Christoph Mallon <christoph mallon gmx de>
2009-02-27 13:28:54 +00:00
Ed Schouten
ff7b7d9039 Revert previous commit to subr_prf.c and make it more tidy.
As mentioned by bz and bde, the change I made wasn't the proper way to
fix. Inspired by bde's patch, perform some small cleanups to uprintf().

Reviewed by:	bz
2009-02-27 12:50:25 +00:00
Ed Schouten
2bbada90c8 Remove redundant assignment of `p'.
`p' is already initialized with `td->td_proc'. Because td is always
curthread, it is safe to initialize it without any locks.

Found by:	LLVM's scan-build
2009-02-26 12:12:34 +00:00
Warner Losh
4592c621f3 Use NULL in preference to 0 for pointers. 2009-02-03 07:51:11 +00:00
Ed Schouten
3a4d0c86aa Revert r185891.
In r185891 I removed the newlines from messages written to /dev/console,
because it made startup messages from rc-scripts harder to read. This,
unfortunately, causes the kernel message that is printed after a
non-terminated log message to be concatenated.

This could be fixed, but on short term it's better to just revert the
change.

Reported by:	Jaakko Heinonen <jh saunalahti fi>
2008-12-21 21:54:01 +00:00
Ed Schouten
d16ebcd4fe Remove added newlines from logged messages written to /dev/console.
The /dev/console device node logs all strings that are written to it.
When the string does not contain a trailing newline, it appends one. I
can imagine this was useful a long time ago, but with our current
rc-scripts, it generates a whole bunch of messages that look like:

| Configuring syscons:
|  blanktime
| .

By not appending the newlines, the output of `dmesg -a' is now (almost?)
exactly the same as what the user will see on the console device
(syscons, uart).
2008-12-10 21:48:05 +00:00
Xin LI
e1088cdca3 Obey signedness flag in %z case.
MFC after:	2 months
2008-11-17 23:57:40 +00:00
Ed Schouten
bc093719ca Integrate the new MPSAFE TTY layer to the FreeBSD operating system.
The last half year I've been working on a replacement TTY layer for the
FreeBSD kernel. The new TTY layer was designed to improve the following:

- Improved driver model:

  The old TTY layer has a driver model that is not abstract enough to
  make it friendly to use. A good example is the output path, where the
  device drivers directly access the output buffers. This means that an
  in-kernel PPP implementation must always convert network buffers into
  TTY buffers.

  If a PPP implementation would be built on top of the new TTY layer
  (still needs a hooks layer, though), it would allow the PPP
  implementation to directly hand the data to the TTY driver.

- Improved hotplugging:

  With the old TTY layer, it isn't entirely safe to destroy TTY's from
  the system. This implementation has a two-step destructing design,
  where the driver first abandons the TTY. After all threads have left
  the TTY, the TTY layer calls a routine in the driver, which can be
  used to free resources (unit numbers, etc).

  The pts(4) driver also implements this feature, which means
  posix_openpt() will now return PTY's that are created on the fly.

- Improved performance:

  One of the major improvements is the per-TTY mutex, which is expected
  to improve scalability when compared to the old Giant locking.
  Another change is the unbuffered copying to userspace, which is both
  used on TTY device nodes and PTY masters.

Upgrading should be quite straightforward. Unlike previous versions,
existing kernel configuration files do not need to be changed, except
when they reference device drivers that are listed in UPDATING.

Obtained from:		//depot/projects/mpsafetty/...
Approved by:		philip (ex-mentor)
Discussed:		on the lists, at BSDCan, at the DevSummit
Sponsored by:		Snow B.V., the Netherlands
dcons(4) fixed by:	kan
2008-08-20 08:31:58 +00:00
Julian Elischer
486a941418 Instead of doing comparisons using the pcpu area to see if
a thread is an idle thread, just see if it has the IDLETD
flag set. That flag will probably move to the pflags word
as it's permenent and never chenges for the life of the
system so it doesn't need locking.
2007-03-08 06:44:34 +00:00
John Birrell
d4fbc81d99 Flushing the buffer is conditional on actually using the buffer. Oops. 2006-11-30 07:25:52 +00:00
John Birrell
e0b651251d Turn console printf buffering into a kernel option and only on
by default for sun4v where it is absolutely required.

This change moves the buffer from struct pcpu to the stack to avoid
using the critical section which created a LOR in a couple of cases
due to interaction with the tty code and kqueue. The LOR can't be
fixed with the critical section and the pcpu buffer can't be used
without the critical section.

Putting the buffer on the stack was my initial solution, but it was
pointed out that the stress on the stack might cause problems
depending on the call path. We don't have a way of creating tests
for those possible cases, so it's best to leave this as an option
for the time being. In time we may get enough data to enable this
option more generally.
2006-11-30 04:17:05 +00:00
Robert Watson
acd3428b7d Sweep kernel replacing suser(9) calls with priv(9) calls, assigning
specific privilege names to a broad range of privileges.  These may
require some future tweaking.

Sponsored by:           nCircle Network Security, Inc.
Obtained from:          TrustedBSD Project
Discussed on:           arch@
Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri,
                        Alex Lyashkov <umka at sevcity dot net>,
                        Skip Ford <skip dot ford at verizon dot net>,
                        Antoine Brodin <antoine dot brodin at laposte dot net>
2006-11-06 13:42:10 +00:00
John Birrell
3d068827c2 Add a cnputs() function to write a string to the console with
a lock to prevent interspersed strings written from different CPUs
at the same time.

To avoid putting a buffer on the stack or having to malloc one,
space is incorporated in the per-cpu structure. The buffer
size if 128 bytes; chosen because it's the next power of 2 size
up from 80 characters.

String writes to the console are buffered up the end of the line
or until the buffer fills. Then the buffer is flushed to all
console devices.

Existing low level console output via cnputc() is unaffected by
this change. ithread calls to log() are also unaffected to avoid
blocking those threads.

A minor change to the behaviour in a panic situation is that
console output will still be buffered, but won't be written to
a tty as before. This should prevent interspersed panic output
as a number of CPUs panic before we end up single threaded
running ddb.

Reviewed by:	scottl, jhb
MFC after:	2 weeks
2006-11-01 04:54:51 +00:00
Robert Watson
5702e0965e Declare security and security.bsd sysctl hierarchies in sysctl.h along
with other commonly used sysctl name spaces, rather than declaring them
all over the place.

MFC after:	1 month
Sponsored by:	nCircle Network Security, Inc.
2006-09-17 20:00:36 +00:00
John Baldwin
19e9205a23 Simplify the pager support in DDB. Allowing different db commands to
install custom pager functions didn't actually happen in practice (they
all just used the simple pager and passed in a local quit pointer).  So,
just hardcode the simple pager as the only pager and make it set a global
db_pager_quit flag that db commands can check when the user hits 'q' (or a
suitable variant) at the pager prompt.  Also, now that it's easy to do so,
enable paging by default for all ddb commands.  Any command that wishes to
honor the quit flag can do so by checking db_pager_quit.  Note that the
pager can also be effectively disabled by setting $lines to 0.

Other fixes:
- 'show idt' on i386 and pc98 now actually checks the quit flag and
  terminates early.
- 'show intr' now actually checks the quit flag and terminates early.
2006-07-12 21:22:44 +00:00
Jung-uk Kim
0d84d9ebb5 Implement printf 'X' conversion for both libstand and kernel. 2006-03-09 22:37:34 +00:00
Scott Long
6ec6fb9bc6 Always print a newline char at the end of the line. 2006-02-25 16:20:22 +00:00
Robert Watson
329c75a730 Acquire Giant in uprintf() and tprintf() rather than asserting it. In
the vast majority of cases, these functions are called without mutexes
held, meaning that in all but two cases, there will be no ordering
issues with doing this, and it will eliminate the need for changes in
the caller.  In two cases, mutexes are held, so Giant must be acquired
before those mutexes such that uprintf() and tprintf() recurse Giant
rather than generating a lock order reversal.

Suggested by:	bde
2005-09-26 08:02:24 +00:00
Robert Watson
5580b0b157 Correct an incorrect comment from the dawn of time: neither tprintf()
nor uprintf() is believed to perform tsleep() or msleep() as written,
as ttycheckoutq() is called with '0' as its sleep argument.

Remove recently added WITNESS warnings for sleep as the comment was
incorrect.  This should silence a warning from the nfs_timer() code.

Discussed with:	bde
2005-09-20 09:55:36 +00:00
Robert Watson
84d2b7df26 Add GIANT_REQUIRED and WITNESS sleep warnings to uprintf() and tprintf(),
as they both interact with the tty code (!MPSAFE) and may sleep if the
tty buffer is full (per comment).

Modify all consumers of uprintf() and tprintf() to hold Giant around
calls into these functions.  In most cases, this means adding an
acquisition of Giant immediately around the function.  In some cases
(nfs_timer()), it means acquiring Giant higher up in the callout.

With these changes, UFS no longer panics on SMP when either blocks are
exhausted or inodes are exhausted under load due to races in the tty
code when running without Giant.

NB: Some reduction in calls to uprintf() in the svr4 code is probably
desirable.

NB: In the case of nfs_timer(), calling uprintf() while holding a mutex,
or even in a callout at all, is a bad idea, and will generate warnings
and potential upset.  This needs to be fixed, but was a problem before
this change.

NB: uprintf()/tprintf() sleeping is generally a bad ideas, as is having
non-MPSAFE tty code.

MFC after:	1 week
2005-09-19 16:51:43 +00:00
Xin LI
5248ef8a3c When padding with zero, do pad after prefixes rather than padding
before prefixes.

Use cases:
	printf("%05d", -42);   -->   "00-42"   (should be "-0042")
	printf("%#05x", 12);   -->   "000xc"   (should be "0x00c")

Submitted by:	Oliver Fromme
PR:		kern/85520
MFC After:	1 week
2005-09-04 18:03:45 +00:00
Poul-Henning Kamp
1e7d2c4763 If we ignore an unknown % sequence, we must stop interpreting the
remaining % arguments because the varargs are now out of sync and
there is a risk that we might for instance dereference an integer
in a %s argument.

Sponsored by: Napatech.com
2005-09-03 10:28:08 +00:00
Doug White
4a30c508d1 Make "show msgbuf" use the pager instead of blasting the whole thing out.
MFC after:	3 days
2005-06-06 22:18:32 +00:00
Poul-Henning Kamp
30a1695b11 Constify hexdump() harder. 2005-04-06 10:14:13 +00:00
Poul-Henning Kamp
572b4402d1 In stange circumstances we may end up being the last reference to a
session in tprintf().   SESSRELE() needs to properly dispose of the
sessions mutex.

Add sessrele() which does the proper cleanup and have SESSRELE() call it.

Use SESSRELE also in pgdelete().

Found by:	Coverity (ID:526)
2005-03-17 08:44:41 +00:00
Marcel Moolenaar
82ebaee7a3 Update for the KDB framework:
o  Check kdb_active instead of db_active and do so unconditionally.
2004-07-10 21:43:23 +00:00
Poul-Henning Kamp
552afd9c12 Clean up and wash struct iovec and struct uio handling.
Add copyiniov() which copies a struct iovec array in from userland into
a malloc'ed struct iovec.  Caller frees.

Change uiofromiov() to malloc the uio (caller frees) and name it
copyinuio() which is more appropriate.

Add cloneuio() which returns a malloc'ed copy.  Caller frees.

Use them throughout.
2004-07-10 15:42:16 +00:00
Brian Feldman
8e1b797456 Add a sysctl/tunable, "kern.always_console_output", that lets you set
output to permanently (not ephemerally) go to the console.  It is also
sent to any other console specified by TIOCCONS as normal.

While I'm here, document the kern.log_console_output sysctl.
2004-06-18 20:12:42 +00:00
Warner Losh
7f8a436ff2 Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core
2004-04-05 21:03:37 +00:00
Nate Lawson
32869e71fb Add support for 'h' and 'hh' modifiers for printf(9).
Submitted by:	Bruno Ducrot <ducrot AT poupinou.org>
Reviewed by:	bde
2004-02-19 05:29:39 +00:00
Scott Long
774114995e Re-arrange and consolidate some random debugging stuff 2003-12-07 05:04:49 +00:00
Poul-Henning Kamp
68f2d20b70 Revert stuff which accidentally ended up in the previous commit. 2003-07-22 10:36:36 +00:00
Poul-Henning Kamp
55d1d7034f Don't attempt to inline large functions mb_alloc() and mb_free(),
it more than doubles the text size of this file.

GCC has wisely ignored us on this previously
2003-07-22 10:24:41 +00:00
Ian Dowse
adef9265ef When DDB is active, always send printf() output directly to the
console, even if there is a TIOCCONS console tty. We were already
doing this after a panic, but it's also useful when entering DDB
for some other reason too.
2003-06-22 03:20:24 +00:00
Ian Dowse
d29bf12ff8 Use a new message buffer `consmsgbuf' to forward messages to a
TIOCCONS console (e.g. xconsole) via a timeout routine instead of
calling into the tty code directly from printf(). This fixes a
number of cases where calling printf() at the wrong time (such as
with locks held) would cause a panic if xconsole is running.

The TIOCCONS message buffer is 8k in size by default, but this can
be changed with the kern.consmsgbuf_size sysctl. By default, messages
are checked for 5 times per second. The timer runs and the buffer
memory remains allocated only at times when a TIOCCONS console is
active.

Discussed on:	freebsd-arch
2003-06-22 02:54:33 +00:00