Commit Graph

61 Commits

Author SHA1 Message Date
Konstantin Belousov
92a9c65b06 Fix build for kernels with dtrace hooks.
MFC after:	1 month
2012-07-11 18:50:50 +00:00
George V. Neville-Neil
3fac94ba94 Initial commit of an I/O provider for DTrace on FreeBSD.
These probes are most useful when looking into the structures
they provide, which are listed in io.d.  For example:

dtrace -n 'io:genunix::start { printf("%d\n", args[0]->bio_bcount); }'

Note that the I/O systems in FreeBSD and Solaris/Illumos are sufficiently
different that there is not a 1:1 mapping from scripts that work
with one to the other.
MFC after:	1 month
2012-07-11 16:27:02 +00:00
Ed Schouten
6472ac3d8a Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.
The SYSCTL_NODE macro defines a list that stores all child-elements of
that node. If there's no SYSCTL_DECL macro anywhere else, there's no
reason why it shouldn't be static.
2011-11-07 15:43:11 +00:00
Kenneth D. Merry
094efe753d Instead of using an atomic operation to determine whether the devstat(9)
device node has been created, pass MAKEDEV_CHECKNAME in so that the devfs
code will do the check.

Use a regular static variable as before, that's good enough to keep us from
calling into devfs most of the time.

Suggested by:	kib
MFC after:	1 week
Sponsored by:	Spectra Logic Corporation
2011-06-13 22:08:24 +00:00
Justin T. Gibbs
27c959cf05 Fix a couple of race conditions in devstat(9) initialization.
In devstat_new_entry(), there is no need to initialize the queue
and the mutex in this function.  There are ways to do static
initialization on both, so use STAILQ_HEAD_INITIALIZER and
MTX_SYSINIT to initialize the queue and the mutex.

In devstat_alloc(), use an atomic test and set routine to guard
making our entry in /dev.  Using just a plain static variable
creates a race condition on multiprocessor machines.  If you
attempt to create a second entry in devfs, the kernel will panic.

Submitted by:	kdm
Reviewed by:	gibbs
Sponsored by:	Spectra Logic Corporation
MFC after:	1 week.
2011-06-13 21:21:02 +00:00
Konstantin Belousov
23b70c1ae2 Finish r210923, 210926. Mark some devices as eternal.
MFC after:	2 weeks
2011-01-04 10:59:38 +00:00
Ed Schouten
60ae52f785 Use ISO C99 integer types in sys/kern where possible.
There are only about 100 occurences of the BSD-specific u_int*_t
datatypes in sys/kern. The ISO C99 integer types are used here more
often.
2010-06-21 09:55:56 +00:00
Robert Noland
cfd7bacef2 Update d_mmap() to accept vm_ooffset_t and vm_memattr_t.
This replaces d_mmap() with the d_mmap2() implementation and also
changes the type of offset to vm_ooffset_t.

Purge d_mmap2().

All driver modules will need to be rebuilt since D_VERSION is also
bumped.

Reviewed by:	jhb@
MFC after:	Not in this lifetime...
2009-12-29 21:51:28 +00:00
Attilio Rao
39df6da8cc Don't allocate new unnecessary pages when devstat_alloc() looses the
run for re-acuiring the lock, but recheck if new pages are allocatable
from the pool and free the previously allocated ones.

Tested by:	pho, Giovanni Trematerra
		<giovanni dot trematerra at gmail dot com>
2009-09-18 13:48:38 +00:00
Warner Losh
2c204a1631 Use NULL in preference to 0 in pointer contexts. 2009-02-03 07:54:42 +00:00
Jeff Roberson
279d4d3761 - Remove two mtx_asserts that can incorrectly trigger if
devstat_end_transaction is called from a fast interrupt.  Presently
   there is no way for mtx_assert to determine that we're not executing
   in a real thread context.

Submitted by:	jhusted@isilon.com
2005-05-03 10:58:05 +00:00
Warner Losh
9454b2d864 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 23:35:40 +00:00
Poul-Henning Kamp
89c9c53da0 Do the dreaded s/dev_t/struct cdev */
Bump __FreeBSD_version accordingly.
2004-06-16 09:47:26 +00:00
Poul-Henning Kamp
dc08ffec87 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
Poul-Henning Kamp
70cd771337 The present defaults for the open and close for device drivers which
provide no methods does not make any sense, and is not used by any
driver.

It is a pretty hard to come up with even a theoretical concept of
a device driver which would always fail open and close with ENODEV.

Change the defaults to be nullopen() and nullclose() which simply
does nothing.

Remove explicit initializations to these from the drivers which
already used them.
2003-09-27 12:01:01 +00:00
Poul-Henning Kamp
037c3d0fb0 It is not an error to have no devices in the kernel: Return the
generation number and start it from one instead of zero.
2003-08-17 12:06:19 +00:00
David E. O'Brien
677b542ea2 Use __FBSDID(). 2003-06-11 00:56:59 +00:00
Hartmut Brandt
6e17a0d754 Unbreak vinum, iostat and systat on sparc64 by changing the devstat
generation number back to a long (sizeof(u_int) != sizeof(long) on
sparc64). The alternative would have been to heavily change the libdevstat API.

Discussed with: phk, ken
2003-04-17 15:06:28 +00:00
Jake Burkholder
227f9a1c58 - Add vm_paddr_t, a physical address type. This is required for systems
where physical addresses larger than virtual addresses, such as i386s
  with PAE.
- Use this to represent physical addresses in the MI vm system and in the
  i386 pmap code.  This also changes the paddr parameter to d_mmap_t.
- Fix printf formats to handle physical addresses >4G in the i386 memory
  detection code, and due to kvtop returning vm_paddr_t instead of u_long.

Note that this is a name change only; vm_paddr_t is still the same as
vm_offset_t on all currently supported platforms.

Sponsored by:	DARPA, Network Associates Laboratories
Discussed with:	re, phk (cdevsw change)
2003-03-25 00:07:06 +00:00
Jake Burkholder
84513ca201 long != int. Use SYSCTL_UINT for kern.devstat.generation. Fixes booting
on sparc64.
2003-03-18 23:32:27 +00:00
Poul-Henning Kamp
c967bee755 If devstat_new_entry() is passed a unit number of -1 assume that
the devstat is for an "interior" GEOM node and register using the
name argument as a geom identity pointer.  Do not put these devstat
structures on the list returned by the sysctl.

This gives us the ability to tell the two kinds of nodes apart and
leave the current "strictly physical" view of devstat intact without
modifications, yet be able to use devstat for both kinds of devices.

It also saves us bloating struct devstat with another 48 bytes of
space for the name.  At least for now.

Reviewed by:    ken
2003-03-18 09:30:31 +00:00
Poul-Henning Kamp
224d5539a9 Make devstat fully Giant agnostic:
Add a mutex and protect the allocation and traversal of the list with it.

When we allocate a page for devstat use we drop the mutex and use
M_WAITOK this is not nice, but under the given circumstances the
best we can do.

In the sysctl handler for returning the devstat entries we do not want to
hold the mutex across copyout(9) calls, so we keep a very careful eye on
the devstat_generation count, and abandon with EBUSY if it changes under
our feet.

Specifically test for BIO_WRITE, rather than default non-read,non-deletes
as write.  Make the default be DEVSTAT_NO_DATA.

Add atomic increments of the sequence[01] fields so applications using the
mmap'ed view stand a chance of detecting updates in progress.

Reviewed by:    ken
2003-03-18 09:20:20 +00:00
Poul-Henning Kamp
538aabaad9 Make devstat_new_entry() take a const void * rather than const char *
argument, GEOM nodes are not identified by ascii string.
2003-03-18 07:52:59 +00:00
Poul-Henning Kamp
5fa5746d3d Add a #define for the device name of the mmap device for devstat.
Constify the geom identification pointer.
2003-03-16 23:20:05 +00:00
Poul-Henning Kamp
d15cd51001 One devstat_start_transaction_bio() is enough. 2003-03-15 22:20:38 +00:00
Poul-Henning Kamp
7194d335cf Run a revision of the devstat interface:
Kernel:

Change statistics to use the *uptime() timescale (ie: relative to
boottime) rather than the UTC aligned timescale.  This makes the
device statistics code oblivious to clock steps.

Change timestamps to bintime format, they are cheaper.

Remove the "busy_count", and replace it with two counter fields:
"start_count" and "end_count", which are updated in the down and
up paths respectively.  This removes the locking constraint on
devstat.

Add a timestamp argument to devstat_start_transaction(), this will
normally be a timestamp set by the *_bio() function in bp->bio_t0.
Use this field to calculate duration of I/O operations.

Add two timestamp arguments to devstat_end_transaction(), one is
the current time, a NULL pointer means "take timestamp yourself",
the other is the timestamp of when this transaction started (see
above).

Change calculation of busy_time to operate on "the salami principle":
Only when we are idle, which we can determine by the start+end
counts being identical, do we update the "busy_from" field in the
down path.  In the up path we accumulate the timeslice in busy_time
and update busy_from.

Change the byte_* and num_* fields into two arrays: bytes[] and
operations[].

Userland:

Change the misleading "busy_time" name to be called "snap_time" and
make the time long double since that is what most users need anyway,
fill it using clock_gettime(CLOCK_MONOTONIC) to put it on the same
timescale as the kernel fields.

Change devstat_compute_etime() to operate on struct bintime.

Remove the version 2 legacy interface: the change to bintime makes
compatibility far too expensive.

Fix a bug in systat's "vm" page where boot relative busy times would
be bogus.

Bump __FreeBSD_version to 500107

Review & Collaboration by:	ken
2003-03-15 21:59:06 +00:00
Poul-Henning Kamp
9fa85de269 Add a devstat_start_transaction_bio() to match the
devstat_end_transaction_bio() we already have.

For now it just calls devstat_start_transaction(), but that will change
shortly.
2003-03-15 10:33:32 +00:00
Poul-Henning Kamp
d42ee4e410 Note that MAJOR_AUTO is now the default if d_maj is not initialized. This
is more robust and prevents the hijacking of /dev/console for the typical
mistake.

Remove unneeded MAJOR_AUTO uses, it is only needed explicitly now if the
driver source has cross-branch compatibility to old releases.
2003-03-09 11:03:45 +00:00
Poul-Henning Kamp
f37de12275 Retire devstat_add_entry() as a public function and bump __FreeBSD_version
to mark this act.
2003-03-08 21:46:43 +00:00
Poul-Henning Kamp
c7e73d59c4 Introduce a device driver for /dev/devstat, this will allow us to mmap
the device statistics structures into userland instead of using sysctl.

Introduce new devstat_new_entry() function which allocates the devstat
structure an calls devstat_add_entry() on it.
2003-03-08 19:58:57 +00:00
Robert Drehmel
e80fb43467 Use strlcpy() instead of strncpy() to copy NUL terminated strings
for safety and consistency.
2002-10-17 20:03:38 +00:00
Poul-Henning Kamp
57c10583aa GC: BIO_ORDERED, various infrastructure dealing with BIO_ORDERED. 2002-02-22 09:26:35 +00:00
Thomas Moestl
938a4e5c0c Export the head structure for the device statistics STAILQ in
sys/devicestat.h, so that the queue can be walked in crashdumps using
libkvm.
2001-08-04 18:02:47 +00:00
Poul-Henning Kamp
37d4006626 Another round of the <sys/queue.h> FOREACH transmogriffer.
Created with:   sed(1)
Reviewed by:    md5(1)
2001-02-04 16:08:18 +00:00
John Baldwin
9701cd40b4 Support for unsigned integer and long sysctl variables. Update the
SYSCTL_LONG macro to be consistent with other integer sysctl variables
and require an initial value instead of assuming 0.  Update several
sysctl variables to use the unsigned types.

PR:		15251
Submitted by:	Kelly Yancey <kbyanc@posi.net>
2000-07-05 07:46:41 +00:00
Poul-Henning Kamp
77978ab8bc Previous commit changing SYSCTL_HANDLER_ARGS violated KNF.
Pointed out by:	bde
2000-07-04 11:25:35 +00:00
Poul-Henning Kamp
82d9ae4e32 Style police catches up with rev 1.26 of src/sys/sys/sysctl.h:
Sanitize SYSCTL_HANDLER_ARGS so that simplistic tools can grog our
sources:

        -sysctl_vm_zone SYSCTL_HANDLER_ARGS
        +sysctl_vm_zone (SYSCTL_HANDLER_ARGS)
2000-07-03 09:35:31 +00:00
Jake Burkholder
e39756439c Back out the previous change to the queue(3) interface.
It was not discussed and should probably not happen.

Requested by:		msmith and others
2000-05-26 02:09:24 +00:00
Jake Burkholder
740a1973a6 Change the way that the queue(3) structures are declared; don't assume that
the type argument to *_HEAD and *_ENTRY is a struct.

Suggested by:	phk
Reviewed by:	phk
Approved by:	mdodd
2000-05-23 20:41:01 +00:00
Poul-Henning Kamp
ad7ba3d455 Remove devstat_end_transaction_buf() everybody uses
devstat_end_transaction_bio() now.
2000-05-06 06:59:08 +00:00
Poul-Henning Kamp
9626b608de Separate the struct bio related stuff out of <sys/buf.h> into
<sys/bio.h>.

<sys/bio.h> is now a prerequisite for <sys/buf.h> but it shall
not be made a nested include according to bdes teachings on the
subject of nested includes.

Diskdrivers and similar stuff below specfs::strategy() should no
longer need to include <sys/buf.> unless they need caching of data.

Still a few bogus uses of struct buf to track down.

Repocopy by:    peter
2000-05-05 09:59:14 +00:00
Poul-Henning Kamp
282ac69ede Clone bio versions of certain bits of infrastructure:
devstat_end_transaction_bio()
        bioq_* versions of bufq_* incl bioqdisksort()
the corresponding "buf" versions will disappear when no longer used.

Move b_offset, b_data and b_bcount to struct bio.

Add BIO_FORMAT as a hack for fd.c etc.

We are now largely ready to start converting drivers to use struct
bio instead of struct buf.
2000-04-02 19:08:05 +00:00
Poul-Henning Kamp
c244d2de43 Move B_ERROR flag to b_ioflags and call it BIO_ERROR.
(Much of this done by script)

Move B_ORDERED flag to b_ioflags and call it BIO_ORDERED.

Move b_pblkno and b_iodone_chain to struct bio while we transition, they
will be obsoleted once bio structs chain/stack.

Add bio_queue field for struct bio aware disksort.

Address a lot of stylistic issues brought up by bde.
2000-04-02 15:24:56 +00:00
Poul-Henning Kamp
21144e3bf1 Remove B_READ, B_WRITE and B_FREEBUF and replace them with a new
field in struct buf: b_iocmd.  The b_iocmd is enforced to have
exactly one bit set.

B_WRITE was bogusly defined as zero giving rise to obvious coding
mistakes.

Also eliminate the redundant struct buf flag B_CALL, it can just
as efficiently be done by comparing b_iodone to NULL.

Should you get a panic or drop into the debugger, complaining about
"b_iocmd", don't continue.  It is likely to write on your disk
where it should have been reading.

This change is a step in the direction towards a stackable BIO capability.

A lot of this patch were machine generated (Thanks to style(9) compliance!)

Vinum users:  Greg has not had time to test this yet, be careful.
2000-03-20 10:44:49 +00:00
Poul-Henning Kamp
2e3c8fcbd0 This is a partial commit of the patch from PR 14914:
Alot of the code in sys/kern directly accesses the *Q_HEAD and *Q_ENTRY
   structures for list operations.  This patch makes all list operations
   in sys/kern use the queue(3) macros, rather than directly accessing the
   *Q_{HEAD,ENTRY} structures.

This batch of changes compile to the same object files.

Reviewed by:    phk
Submitted by:   Jake Burkholder <jake@checker.org>
PR:     14914
1999-11-16 10:56:05 +00:00
Bruce Evans
39b3c6a9b6 Removed unnecessary splclock() protection for getmicrotime() and
getmicrouptime().

Removed unused includes.

Reviewed by:	ken
1999-10-02 07:34:11 +00:00
Poul-Henning Kamp
c8a90c31c9 Stylistic cleanup.
Submitted by:	ken.
1999-09-22 20:21:28 +00:00
Poul-Henning Kamp
8db3b94765 Move an end-paren to its intended place. 1999-09-19 08:28:49 +00:00
Poul-Henning Kamp
f80d57eec0 Count "free" operations in their own new tranaction type.
WARNING: libdevstat, iostat, vmstat, systat etc etc will need a recompile.

Add devstat_end_transaction_buf() which pulls all the vital data out
of a struct buf which is ready for biodone().
1999-09-18 21:28:09 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00