linux.git/drivers/char/hvc_console.h, branch master

tty: move hvc drivers to drivers/tty/hvc/

2011-01-13T20:03:00+00:00

As requested by Arnd Bergmann, the hvc drivers are now
moved to the drivers/tty/hvc/ directory.  The virtio_console.c driver
was also moved, as it required the hvc_console.h file to be able to be
built, and it really is a hvc driver.

Cc: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

hvc_console: Remove __devinit annotation from hvc_alloc

2010-02-03T06:39:49+00:00

Virtio consoles can be hotplugged, so hvc_alloc gets called from
multiple sites: from the initial probe() routine as well as later on
from workqueue handlers which aren't __devinit code.

So, drop the __devinit annotation for hvc_alloc.

Signed-off-by: Amit Shah 
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt

hvc_console: Make the ops pointer const.

2010-02-03T06:39:49+00:00

This is nicer for modern R/O protection.  And noone needs it non-const, so
constify the callers as well.

Signed-off-by: Rusty Russell 
Signed-off-by: Amit Shah 
To: Christian Borntraeger 
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt

hvc_console: Provide (un)locked version for hvc_resize()

2009-09-24T05:12:47+00:00

Rename the locking free hvc_resize() function to __hvc_resize() and
provide an inline function that locks the hvc_struct and calls
__hvc_resize().

The rationale for this patch is that virtio_console calls the hvc_resize()
function without locking the hvc_struct. So it needs to call the lock
itself.

According to naming rules, the unlocked version is renamed and
prefixed with "__".
References to unlocked function calls in hvc back-ends has been updated.

Signed-off-by: Hendrik Brueckner 
Acked-by: Christian Borntraeger 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Make open count variables signed in hvcs/hvsi/hvc_console

2008-12-03T10:04:13+00:00

Otherwise the tests for count < 0 will never be true.

Signed-off-by: Roel Kluin 
Signed-off-by: Paul Mackerras

hvc_console: Remove __devexit annotation of hvc_remove()

2008-10-22T00:00:25+00:00

Removed __devexit annotation of hvc_remove() to avoid a section mismatch
if the backend initialization fails and hvc_remove() must be used to
clean up allocated hvc structs (called in section __init or __devinit).

Acked-by: Christian Borntraeger 
Signed-off-by: Hendrik Brueckner 
Signed-off-by: Benjamin Herrenschmidt

hvc_console: Add support for tty window resizing

2008-10-22T00:00:25+00:00

The patch provides the hvc_resize() function to update the terminal
window dimensions (struct winsize) for a specified hvc console.
The function stores the new window size and schedules a function
that finally updates the tty winsize and signals the change to
user space (SIGWINCH).
Because the winsize update must acquire a mutex and might sleep,
the function is scheduled instead of being called from hvc_poll()
or khvcd.

This patch uses the tty_do_resize() routine from the tty layer.
A pending resize work is canceled in hvc_close() and hvc_hangup().

Signed-off-by: Hendrik Brueckner 
Signed-off-by: Benjamin Herrenschmidt

hvc_console: Add a hangup notifier for backends

2008-10-21T23:59:54+00:00

I have added a hangup notifier that can be used by hvc console
backends to handle a tty hangup. The default irq hangup notifier
calls the notifier_del_irq() for compatibility.

Acked-by: Christian Borntraeger 
Signed-off-by: Hendrik Brueckner 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Move include files to arch/powerpc/include/asm

2008-08-04T02:02:00+00:00

from include/asm-powerpc.  This is the result of a

mkdir arch/powerpc/include/asm
git mv include/asm-powerpc/* arch/powerpc/include/asm

Followed by a few documentation/comment fixups and a couple of places
where  was being used explicitly.  Of the latter only
one was outside the arch code and it is a driver only built for powerpc.

Signed-off-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras

hvc_console: rework setup to replace irq functions with callbacks

2008-07-25T02:06:06+00:00

This patch tries to change hvc_console to not use request_irq/free_irq if
the backend does not use irqs. This allows virtio_console to use hvc_console
without having a linker reference to request_irq/free_irq.

In addition, together with patch 2/3 it improves the performance for virtio
console input. (an earlier version of this patch was tested by Yajin on lguest)

The irq specific code is moved to hvc_irq.c and selected by the drivers that
use irqs (System p, System i, XEN).

I replaced "int irq" with the opaque "int data". The request_irq and
free_irq calls are replaced with notifier_add and notifier_del. I have also
changed the code a bit to call the notifier_add and notifier_del inside the
spinlock area as the callbacks are found via hp->ops.

Changes since last version:
o remove ifdef
o reintroduce "irq_requested" as "notified"
o cleanups, sparse..

I did not move the timer based polling into a separate polling scheme. I
played with several variants, but it seems we need to sleep/schedule in
a thread even for irq based consoles, as there are throttleing and buffer
size constraints.

I also kept hvc_struct defined in hvc_console.h so that hvc_irq.c can access
the irq_requested element.

Feedback is appreciated. virtio_console is currently the only available console
for kvm on s390. I plan to push this change as soon as all affected parties
agree on it. I would love to get test results from System p, Xen etc.

Signed-off-by: Christian Borntraeger 
Signed-off-by: Rusty Russell