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History log of /src/sys/dev/dmover/dmover_io.c
RevisionDateAuthorComments
 1.46  10-Feb-2019  christos Introduce PR_ZERO to avoid open-coding memset()s everywhere. OK riastradh@.
 1.45  30-Nov-2017  christos branches: 1.45.4;
add fo_name so we can identify the fileops in a simple way.
 1.44  20-Aug-2015  christos include "ioconf.h" to get the 'void <driver>attach(int count);' prototype.
 1.43  25-Jul-2014  dholland branches: 1.43.4;
Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.
 1.42  16-Mar-2014  dholland branches: 1.42.2;
Change (mostly mechanically) every cdevsw/bdevsw I can find to use
designated initializers.

I have not built every extant kernel so I have probably broken at
least one build; however I've also found and fixed some wrong
cdevsw/bdevsw entries so even if so I think we come out ahead.
 1.41  25-Jul-2013  msaitoh Clear struct stat correctly. Fixes PR#46373.
 1.40  14-May-2011  jakllsch branches: 1.40.4; 1.40.14; 1.40.18;
Modernize simple_lock() and ltsleep() usage in dmover(4).
(Thanks to rmind for providing hints on what was necessary.)
 1.39  13-Nov-2010  uebayasi branches: 1.39.2;
dmover(4) really uses uvm(9). (Wasn't revealed by i386/ALL...)
 1.38  13-Nov-2010  uebayasi Don't pull in the whole uvm(9) API to access only PAGE_SIZE and
some other constants. These are provided by sys/param.h now.
 1.37  20-Dec-2009  dsl branches: 1.37.4;
If a multithreaded app closes an fd while another thread is blocked in
read/write/accept, then the expectation is that the blocked thread will
exit and the close complete.
Since only one fd is affected, but many fd can refer to the same file,
the close code can only request the fs code unblock with ERESTART.
Fixed for pipes and sockets, ERESTART will only be generated after such
a close - so there should be no change for other programs.
Also rename fo_abort() to fo_restart() (this used to be fo_drain()).
Fixes PR/26567
 1.36  09-Dec-2009  dsl Rename fo_drain() to fo_abort(), 'drain' is used to mean 'wait for output
do drain' in many places, whereas fo_drain() was called in order to force
blocking read()/write() etc calls to return to userspace so that a close()
call from a different thread can complete.
In the sockets code comment out the broken code in the inner function,
it was being called from compat code.
 1.35  01-May-2009  nonaka compile again.
 1.34  11-Apr-2009  christos Fix locking as Andy explained. Also fill in uid and gid like sys_pipe did.
 1.33  11-Apr-2009  christos Fix PR/37878 and PR/37550: Provide stat(2) for all devices and don't use
fbadop_stat.
 1.32  04-Apr-2009  ad Add fileops::fo_drain(), to be called from fd_close() when there is more
than one active reference to a file descriptor. It should dislodge threads
sleeping while holding a reference to the descriptor. Implemented only for
sockets but should be extended to pipes, fifos, etc.

Fixes the case of a multithreaded process doing something like the
following, which would have hung until the process got a signal.

thr0 accept(fd, ...)
thr1 close(fd)
 1.31  26-Mar-2008  ad branches: 1.31.4; 1.31.12; 1.31.14; 1.31.18;
Update dmover fileops to compile again. From he@.
 1.30  01-Mar-2008  rmind Welcome to 4.99.55:

- Add a lot of missing selinit() and seldestroy() calls.

- Merge selwakeup() and selnotify() calls into a single selnotify().

- Add an additional 'events' argument to selnotify() call. It will
indicate which event (POLL_IN, POLL_OUT, etc) happen. If unknown,
zero may be used.

Note: please pass appropriate value of 'events' where possible.
Proposed on: <tech-kern>
 1.29  04-Jan-2008  ad branches: 1.29.2; 1.29.6;
Start detangling lock.h from intr.h. This is likely to cause short term
breakage, but the mess of dependencies has been regularly breaking the
build recently anyhow.
 1.28  25-Sep-2007  ad branches: 1.28.4; 1.28.10;
Use selinit() / seldestroy().
 1.27  12-Jul-2007  rmind branches: 1.27.6; 1.27.8; 1.27.10;
Implementation of per-CPU work-queues support for workqueue(9) interface.
WQ_PERCPU flag for workqueue and additional argument for workqueue_enqueue()
to assign a CPU might be used. Notes:
- For now, the list is used for workqueue_queue, which is non-optimal,
and will be changed with array, where index would be CPU ID.
- The data structures should be changed to be cache-friendly.

Reviewed by: <yamt>, <tech-kern>
 1.26  12-Mar-2007  ad Pass an ipl argument to pool_init/POOL_INIT to be used when initializing
the pool's lock.
 1.25  13-Jan-2007  cube branches: 1.25.2; 1.25.6;
Complete initializers so those files compile.
 1.24  21-Dec-2006  yamt merge yamt-splraiseipl branch.

- finish implementing splraiseipl (and makeiplcookie).
http://mail-index.NetBSD.org/tech-kern/2006/07/01/0000.html
- complete workqueue(9) and fix its ipl problem, which is reported
to cause audio skipping.
- fix netbt (at least compilation problems) for some ports.
- fix PR/33218.
 1.23  28-Jul-2006  ad branches: 1.23.4; 1.23.6;
Correct first arg to falloc().
 1.22  14-May-2006  elad integrate kauth.
 1.21  01-Mar-2006  yamt branches: 1.21.2; 1.21.4; 1.21.6;
merge yamt-uio_vmspace branch.

- use vmspace rather than proc or lwp where appropriate.
the latter is more natural to specify an address space.
(and less likely to be abused for random purposes.)
- fix a swdmover race.
 1.20  17-Jan-2006  yamt branches: 1.20.2; 1.20.4;
dmoverioopen: add a missing simple_lock_init().
 1.19  24-Dec-2005  perry branches: 1.19.2;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.
 1.18  11-Dec-2005  christos merge ktrace-lwp.
 1.17  12-Feb-2005  christos branches: 1.17.6;
pass the flag to fdclone.
 1.16  05-Dec-2004  he branches: 1.16.4; 1.16.6;
Correct a typo: it's fnullop_kqfilter and not fnullop_kqueue.
 1.15  30-Nov-2004  christos Cloning cleanup:
1. make fileops const
2. add 2 new negative errno's to `officially' support the cloning hack:
- EDUPFD (used to overload ENODEV)
- EMOVEFD (used to overload ENXIO)
3. Created an fdclone() function to encapsulate the operations needed for
EMOVEFD, and made all cloners use it.
4. Centralize the local noop/badop fileops functions to:
fnullop_fcntl, fnullop_poll, fnullop_kqfilter, fbadop_stat
 1.14  28-Nov-2004  thorpej Fix the fcntl entry points; cmd is a command, not the flags themselves.
Pointed out by Christos (he wrote the broken code originally, and I copied
it to another file later :-)
 1.13  13-Sep-2003  jdolecek branches: 1.13.4;
move dupfd from struct proc to struct lwp - it's per-LWP, not per-process; we
use curlwp where the lwp is not directly available, i.e. in device open
routines

briefly discussed on tech-kern
 1.12  19-Jul-2003  thorpej Add immediate value support for dmoverio transactions.
 1.11  29-Jun-2003  fvdl branches: 1.11.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.
 1.10  28-Jun-2003  darrenr Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V
 1.9  30-May-2003  scw In dmio_read(), make sure to set DMIO_STATE_READ_WAIT in ds->ds_flags
before going to sleep.
 1.8  21-Mar-2003  dsl Change 'data' argument to fo_ioctl and fo_fcntl from 'caddr_t' to 'void *'.
Avoids a lot of casting and removes the need for some line breaks.
Removed a load of (caddr_t) casts from calls to copyin/copyout as well.
(approved by christos - he has a plan to remove caddr_t...)
 1.7  07-Nov-2002  thorpej Fix signed/unsigned comparison warnings.
 1.6  23-Oct-2002  jdolecek merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe
 1.5  06-Sep-2002  gehenna Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.
 1.4  04-Aug-2002  thorpej branches: 1.4.2; 1.4.4; 1.4.6;
*Actually return* EINVAL when the output stream UIO's I/O is larger
than SSIZE_MAX.
 1.3  02-Aug-2002  thorpej Fix a signed/unsigned botch that broke an error recovery path.
(I could have sworn I fixed this bug over a week ago...)
 1.2  02-Aug-2002  thorpej Grr, fix typo in RCS ID tag.
 1.1  02-Aug-2002  thorpej dmover(9) -- an interface to hardware-assisted data movers. This allows
clients to use a hardware-assisted data mover to clear a region of memory,
fill a region of memory with a specific value, copy a region of memory,
and perform simple boolean operations such as XOR on multiple regions
of memory.

Included here is a software back-end which can serve as an example of
how to write a back-end (and also provides a fall-back in case hardware
for a given function is not available), as well as a dmoverio(4) pseudo-
device which provides access to dmover(9) to userland via a message
passing interface.

dmover(9) is still a work-in-progress -- a few minor changes to the
interface are expected.
 1.4.6.3  10-Oct-2002  jdolecek sync kqueue with -current; this includes merge of gehenna-devsw branch,
merge of i386 MP branch, and part of autoconf rototil work
 1.4.6.2  06-Sep-2002  jdolecek sync kqueue branch with HEAD
 1.4.6.1  04-Aug-2002  jdolecek file dmover_io.c was added on branch kqueue on 2002-09-06 08:44:01 +0000
 1.4.4.3  29-Aug-2002  gehenna Add character device switch.
 1.4.4.2  29-Aug-2002  gehenna catch up with -current.
 1.4.4.1  04-Aug-2002  gehenna file dmover_io.c was added on branch gehenna-devsw on 2002-08-29 05:22:23 +0000
 1.4.2.3  11-Nov-2002  nathanw Catch up to -current
 1.4.2.2  17-Sep-2002  nathanw Catch up to -current.
 1.4.2.1  04-Aug-2002  nathanw file dmover_io.c was added on branch nathanw_sa on 2002-09-17 21:19:31 +0000
 1.11.2.9  15-Feb-2005  skrll Sync with HEAD.
 1.11.2.8  17-Jan-2005  skrll Adapt to branch.
 1.11.2.7  18-Dec-2004  skrll Sync with HEAD.
 1.11.2.6  29-Nov-2004  skrll Sync with HEAD.
 1.11.2.5  21-Sep-2004  skrll Fix the sync with head I botched.
 1.11.2.4  18-Sep-2004  skrll Sync with HEAD.
 1.11.2.3  03-Aug-2004  skrll Sync with HEAD
 1.11.2.2  02-Jul-2003  wrstuden Check in lwp-ification changes needed to get the evbarm/IQ80321 kernel
to compile.

only question I have is over the:
l->l_proc->p_stats->p_ru.ru_msgsnd++;
command at line 245 of dev/kttcp.c. Should we be doing per-lwp or
per-proc accounting?
 1.11.2.1  02-Jul-2003  darrenr Apply the aborted ktrace-lwp changes to a specific branch. This is just for
others to review, I'm concerned that patch fuziness may have resulted in some
errant code being generated but I'll look at that later by comparing the diff
from the base to the branch with the file I attempt to apply to it. This will,
at the very least, put the changes in a better context for others to review
them and attempt to tinker with removing passing of 'struct lwp' through
the kernel.
 1.13.4.1  23-Feb-2005  he Pull up revision 1.14 (requested by thorpej in ticket #1008):
Fix the fcntl entry points; ``cmd'' is a command, not the
flags themselves.
 1.16.6.1  19-Mar-2005  yamt sync with head. xen and whitespace. xen part is not finished.
 1.16.4.1  29-Apr-2005  kent sync with -current
 1.17.6.7  17-Mar-2008  yamt sync with head.
 1.17.6.6  21-Jan-2008  yamt sync with head
 1.17.6.5  27-Oct-2007  yamt sync with head.
 1.17.6.4  03-Sep-2007  yamt sync with head.
 1.17.6.3  26-Feb-2007  yamt sync with head.
 1.17.6.2  30-Dec-2006  yamt sync with head.
 1.17.6.1  21-Jun-2006  yamt sync with head.
 1.19.2.2  04-Feb-2006  yamt adapt dmover.
 1.19.2.1  01-Feb-2006  yamt sync with head.
 1.20.4.2  01-Jun-2006  kardel Sync with head.
 1.20.4.1  22-Apr-2006  simonb Sync with head.
 1.20.2.1  09-Sep-2006  rpaulo sync with head
 1.21.6.1  24-May-2006  tron Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
 1.21.4.1  08-Mar-2006  elad Adapt to kernel authorization KPI.
 1.21.2.2  11-Aug-2006  yamt sync with head
 1.21.2.1  24-May-2006  yamt sync with head.
 1.23.6.1  18-Sep-2006  yamt don't bother to wrap splraiseipl and IPL_xxx with #if notyet.
 1.23.4.2  01-Feb-2007  ad Sync with head.
 1.23.4.1  12-Jan-2007  ad Sync with head.
 1.25.6.3  09-Oct-2007  ad Sync with head.
 1.25.6.2  15-Jul-2007  ad Sync with head.
 1.25.6.1  13-Mar-2007  ad Sync with head.
 1.25.2.1  24-Mar-2007  yamt sync with head.
 1.27.10.1  06-Oct-2007  yamt sync with head.
 1.27.8.3  23-Mar-2008  matt sync with HEAD
 1.27.8.2  09-Jan-2008  matt sync with HEAD
 1.27.8.1  06-Nov-2007  matt sync with HEAD
 1.27.6.1  02-Oct-2007  joerg Sync with HEAD.
 1.28.10.1  08-Jan-2008  bouyer Sync with HEAD
 1.28.4.1  18-Feb-2008  mjf Sync with HEAD.
 1.29.6.1  03-Apr-2008  mjf Sync with HEAD.
 1.29.2.1  24-Mar-2008  keiichi sync with head.
 1.31.18.1  13-May-2009  jym Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.
 1.31.14.1  04-Apr-2009  snj Pull up following revision(s) (requested by ad in ticket #661):
sys/arch/xen/xen/xenevt.c: revision 1.32
sys/compat/svr4/svr4_net.c: revision 1.56
sys/compat/svr4_32/svr4_32_net.c: revision 1.19
sys/dev/dmover/dmover_io.c: revision 1.32
sys/dev/putter/putter.c: revision 1.21
sys/kern/kern_descrip.c: revision 1.190
sys/kern/kern_drvctl.c: revision 1.23
sys/kern/kern_event.c: revision 1.64
sys/kern/sys_mqueue.c: revision 1.14
sys/kern/sys_pipe.c: revision 1.109
sys/kern/sys_socket.c: revision 1.59
sys/kern/uipc_syscalls.c: revision 1.136
sys/kern/vfs_vnops.c: revision 1.164
sys/kern/uipc_socket.c: revision 1.188
sys/net/bpf.c: revision 1.144
sys/net/if_tap.c: revision 1.55
sys/opencrypto/cryptodev.c: revision 1.47
sys/sys/file.h: revision 1.67
sys/sys/param.h: patch
sys/sys/socketvar.h: revision 1.119
Add fileops::fo_drain(), to be called from fd_close() when there is more
than one active reference to a file descriptor. It should dislodge threads
sleeping while holding a reference to the descriptor. Implemented only for
sockets but should be extended to pipes, fifos, etc.
Fixes the case of a multithreaded process doing something like the
following, which would have hung until the process got a signal.
thr0 accept(fd, ...)
thr1 close(fd)
 1.31.12.1  28-Apr-2009  skrll Sync with HEAD.
 1.31.4.2  11-Mar-2010  yamt sync with head
 1.31.4.1  04-May-2009  yamt sync with head.
 1.37.4.1  31-May-2011  rmind sync with head
 1.39.2.1  06-Jun-2011  jruoho Sync with HEAD.
 1.40.18.2  18-May-2014  rmind sync with head
 1.40.18.1  28-Aug-2013  rmind sync with head
 1.40.14.2  03-Dec-2017  jdolecek update from HEAD
 1.40.14.1  20-Aug-2014  tls Rebase to HEAD as of a few days ago.
 1.40.4.1  22-May-2014  yamt sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")
 1.42.2.1  10-Aug-2014  tls Rebase.
 1.43.4.1  22-Sep-2015  skrll Sync with HEAD
 1.45.4.1  10-Jun-2019  christos Sync with HEAD

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