Commit Graph

50 Commits

Author SHA1 Message Date
imp
6204638785 We need to initialize the console for dcons to work.
Submitted by:	nork@
2009-03-13 02:15:49 +00:00
marius
325428c528 Check the return values of contigmalloc(9) as well as bus_dma(9)
functions and stop attaching of dcons(4) and dcons_crom(4) if
they indicate failure. This fixes a panic seen on sparc64 machines
with no free physical memory in the requested 32-bit region but
still doesn't make dcons(4)/dcons_crom(4) these work. I think
the latter can be fixed by simply specifying ~0UL as the upper
limit for contigmalloc(9) and letting the bounce pages and the
IOMMU respectively handle limitations of the DMA engine. I didn't
want to change that without the consensus of simokawa@ though,
who unfortunately didn't reply so far.

MFC after:	1 week
2009-01-07 21:25:44 +00:00
marius
fd213ef8e2 Given that the buffer dcons_crom(4) exposes is used for both input
and output, set BUS_DMA_COHERENT when creating the DMA map used for
loading the buffer. As a side-effect this solves locking issues on
sparc64 when dcons(4) calls bus_dmamap_sync(9) while in an interrupt
filter, which are executed in a critical section, and iommu(4) has
to use a sleep lock when taking advantage of the streaming buffer.

Reported and tested by:	kensmith
Approved by:		simokawa
2008-11-19 22:09:03 +00:00
ed
26ef99f3eb Also make dcons(4) use MPSAFE callouts.
The callout locks the TTY layer the way it should, so there is no reason
why its callout shouldn't set this flag.
2008-11-19 21:12:26 +00:00
ed
cc3116a938 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
peter
420af22bc1 Spell KDB_REQ_REBOOT correctly. 2008-05-05 08:25:46 +00:00
peter
5a3c5f632b Expand kdb_alt_break a little, most commonly used with the option
ALT_BREAK_TO_DEBUGGER.  In addition to "Enter ~ ctrl-B" (to enter the
debugger), there is now "Enter ~ ctrl-P" (force panic) and
"Enter ~ ctrl-R" (request clean reboot, ala ctrl-alt-del on syscons).

We've used variations of this at work.  The force panic sequence is
best used with KDB_UNATTENDED for when you just want it to dump and
get on with it.

The reboot request is a safer way of getting into single user than
a power cycle.  eg: you've hosed the ability to log in (pam, rtld, etc).
It gives init the reboot signal, which causes an orderly reboot.

I've taken my best guess at what the !x86 and non-sio code changes
should be.

This also makes sio release its spinlock before calling KDB/DDB.
2008-05-04 23:29:38 +00:00
rwatson
bdee30611d Add a new 'why' argument to kdb_enter(), and a set of constants to use
for that argument.  This will allow DDB to detect the broad category of
reason why the debugger has been entered, which it can use for the
purposes of deciding which DDB script to run.

Assign approximate why values to all current consumers of the
kdb_enter() interface.
2007-12-25 17:52:02 +00:00
simokawa
b906b986a3 We don't need to call dcons_poll event handlers if KDB is not active.
Approved by: re (kensmith)
2007-08-17 05:32:39 +00:00
simokawa
1f5ee5cc4f - Don't force to be the GDB port since dcons(4) is in GENERIC now.
To enable the GDB port of dcons(4), you need to put
  dcons_gdb=1
in /boot/loader.conf.
2007-06-11 04:08:50 +00:00
simokawa
5402acc145 Don't invalidate dcons buffer on shutdown.
We would like to keep connection after halt.
2007-06-08 08:23:14 +00:00
simokawa
5f5cd9e4f2 Add the address of IDT in the configuration ROM. (i386/amd64 only)
A change to dconschat(8) will follow so that it can bomb
this address over FireWire to reset a wedged system.

Though this method is just a hack and far from perfection,
it should be useful if you don't want to go machine room
just to reset or to power-cycle a machine without
remote-managed power supply.  And much better than doing:
# fwcontrol -m target-eui64
# dd if=/dev/zero of=/dev/fwmem0.2 bs=1m
2007-06-08 04:33:25 +00:00
simokawa
193607a47c Replace breakpoint() with kdb_enter(). 2007-06-08 03:05:57 +00:00
simokawa
ed91131846 Poll bus resets on FireWire while kdb/gdb is active.
Now, it's safe to call the fwohci interrupt(polling) routine while ddb/gdb
is active. After this change, a dcons connnection over FireWire can survive
bus resets even in kernel debugger.

This means that it is not too late to plug a FireWire cable after a panic
to investigate the problem.

Actually there is a small window(between a jump to kernel from loader and
initialization of dcons_crom) in which no one can take care of a bus reset.
Except that window, firewire console should keep working
from loader to reboot even with a panic and a bus reset.
(as far as you enable LOADER_FIREWIRE_SUPPORT)
2007-06-08 00:54:44 +00:00
simokawa
de252c3783 We should better ignore a break on gdb port if gdb is not enabled. 2007-05-28 02:20:40 +00:00
simokawa
135548ec9b Change default value of hw.firewire.dcons_crom.force_console to 0
for least astonishment.

MFC after: 3 days
2007-05-27 14:00:34 +00:00
simokawa
12d8c7f3b2 Make compile without GDB option.
MFC after: 3 days
2007-05-27 13:58:43 +00:00
simokawa
41c3e23fd6 Include stand.h for loader.
MFC after: 3 days
2007-05-25 05:00:39 +00:00
rwatson
10d0d9cf47 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
phk
c7b8431cf0 Convert to new console interface. 2006-05-26 13:51:38 +00:00
phk
7879ac129f Eliminate gdb_checkc member from GDB_DBGPORT(), it is never used.
Use polling behaviour for gdb_getc() where convenient, this edges us
closer to the console code.
2006-05-26 11:54:32 +00:00
phk
990533856e Use ttyalloc() instead of ttymalloc() 2006-01-04 09:20:41 +00:00
ru
9b19d72862 Fix -Wundef warnings found when compiling i386 LINT, GENERIC and
custom kernels.
2005-12-05 11:58:35 +00:00
phk
10f4dbda56 Make ttyconsolemode() call ttsetwater() so that drivers don't have to. 2005-10-16 20:58:22 +00:00
imp
4b319958e7 Start each of the license/copyright comments with /*-, minor shuffle of lines 2005-01-06 01:43:34 +00:00
simokawa
8f7bf32c34 Use dcons buffer passed by loader on amd64. 2004-10-28 12:18:22 +00:00
simokawa
feac68dce9 - Use quad_t for dcons buffer address and size.
- Allow read/write access to dcons buffer passed by loader(8).
2004-10-24 12:41:04 +00:00
simokawa
251f5975d3 Check _BOOT flag. 2004-10-22 15:03:22 +00:00
phk
dafa1caf81 Add new function ttyinitmode() which sets our systemwide default
modes on a tty structure.

Both the ".init" and the current settings are initialized allowing
the function to be used both at attach and open time.

The function takes an argument to decide if echoing should be enabled.
Echoing should not be enabled for regular physical serial ports
unless they are consoles, in which case they should be configured
by ttyconsolemode() instead.

Use the new function throughout.
2004-10-18 21:51:27 +00:00
simokawa
4255df54a6 Fix warnings on non-i386 arch.
Submitted by: keramida
2004-10-14 00:21:32 +00:00
simokawa
bc246db21d - Split dcons core code and OS dependent code.
- Implement dcons_ischar() and dcons_load_buffer().
- If loader passed a dcons buffer address, keep using it.
	(We still need a patch to cheat memory management system.)
2004-10-13 05:38:42 +00:00
simokawa
fa427e74bd Invalidate dcons buffer on shutdown. 2004-09-26 01:15:38 +00:00
simokawa
1de46e4a15 Sync with DragonFly BSD. 2004-09-24 12:43:57 +00:00
phk
f00200d8a4 Preparation commit for the tty cleanups that will follow in the near
future:

rename ttyopen() -> tty_open() and ttyclose() -> tty_close().

We need the ttyopen() and ttyclose() for the new generic cdevsw
functions for tty devices in order to have consistent naming.
2004-07-15 20:47:41 +00:00
phk
5c95d686a1 Do a pass over all modules in the kernel and make them return EOPNOTSUPP
for unknown events.

A number of modules return EINVAL in this instance, and I have left
those alone for now and instead taught MOD_QUIESCE to accept this
as "didn't do anything".
2004-07-15 08:26:07 +00:00
simokawa
0f9bf45316 Re-enable debugger port. 2004-07-13 09:41:45 +00:00
marcel
2a624cf907 Update for the KDB framework:
o  Use kdb_alt_break() to handle the alternate break sequence instead
   of handcoding it here.
o  Remove GDB kluges to make this driver work with the pre-KDB remote
   GDB code.
o  Call kdb_enter() instead of Debugger().

Note that with this commit the dcons(4) driver cannot be used for
remote debugging anymore. This driver has to use the new GDB debug
port interface instead. Such has not been done yet.
2004-07-10 21:02:17 +00:00
phk
40dd98a3bd Second half of the dev_t cleanup.
The big lines are:
	NODEV -> NULL
	NOUDEV -> NODEV
	udev_t -> dev_t
	udev2dev() -> findcdev()

Various minor adjustments including handling of userland access to kernel
space struct cdev etc.
2004-06-17 17:16:53 +00:00
phk
dfd1f7fd50 Do the dreaded s/dev_t/struct cdev */
Bump __FreeBSD_version accordingly.
2004-06-16 09:47:26 +00:00
phk
ba3920e2a2 Machine generated patch which changes linedisc calls from accessing
linesw[] directly to using the ttyld...() functions

The ttyld...() functions ar inline so there is no performance hit.
2004-06-04 16:02:56 +00:00
phk
83ae77becd Gainfully employ the new ttyioctl in the trivial cases. 2004-06-01 13:49:28 +00:00
phk
b59eec9a5a There is no need to explicitly call ttwakeup() and ttwwakeup() after
ttyclose() has been called.  It's already been done once by ttyclose,
and probably once by the line-discipline too.
2004-06-01 11:38:06 +00:00
phk
d4a4e27cd4 ttyclose() increments t_gen. Remove redundant increments in drivers. 2004-06-01 10:15:56 +00:00
phk
9d102d7d5a Add missing <sys/module.h> includes 2004-05-30 20:08:47 +00:00
phk
ad925439e0 Device megapatch 4/6:
Introduce d_version field in struct cdevsw, this must always be
initialized to D_VERSION.

Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing
four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.
2004-02-21 21:10:55 +00:00
phk
fcf7e634fb Device megapatch 3/6:
Add missing D_TTY flags to various drivers.

Complete asserts that dev_t's passed to ttyread(), ttywrite(),
ttypoll() and ttykqwrite() have (d_flags & D_TTY) and a struct tty
pointer.

Make ttyread(), ttywrite(), ttypoll() and ttykqwrite() the default
cdevsw methods for D_TTY drivers and remove the explicit initializations
in various drivers cdevsw structures.
2004-02-21 20:41:11 +00:00
phk
df397dedea Device megapatch 1/6:
Free approx 86 major numbers with a mostly automatically generated patch.

A number of strategic drivers have been left behind by caution, and a few
because they still (ab)use their major number.
2004-02-21 19:42:58 +00:00
simokawa
24775302eb - Clean up global data.
- Force dcons to be the high-level console after dcons_crom
	has been attached.
- Add a tunable to be the high-level console.
2004-02-16 07:25:46 +00:00
simokawa
3357535415 Move post dmamap_load processes into the callback function. 2003-11-08 16:26:22 +00:00
simokawa
c96f6e4f1d Add dumb console driver and related bits.
dcons(4): very simple console and gdb port driver
dcons_crom(4): FireWire attachment
dconschat(8): User interface to dcons

Tested with: i386, i386-PAE, and sparc64.
2003-10-24 15:44:10 +00:00