Commit Graph

19 Commits

Author SHA1 Message Date
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00
Helge Deller e38de678f6 Input: constify psmouse driver
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2006-09-10 21:54:39 -04:00
Dmitry Torokhov 08ffce4560 Input: fix potential overflows in driver/input/mouse
Change all sprintfs into snprintfs to make sure we won't stomp on
data adjacent to our buffers.

Noticed by Wouter Paesen <wouter@kangaroot.net>

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2006-06-26 01:45:10 -04:00
Yotam Medini d2f4012f15 Input: alps - fix old protocol decoding
Correct touchpad left & right keys assignments for ALPS_OLDPROTO
that were swapped. Old protocol is used on UMAX ActionBook-530T
notebook.

Signed-off-by: Yotam Medini <yotam.medini@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2006-05-29 23:30:36 -04:00
Dmitry Torokhov f0d5c6f419 Input: psmouse - attempt to re-synchronize mouse every 5 seconds
This should help driver to deal vith KVMs that reset mice when
switching between boxes.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2006-01-14 00:27:37 -05:00
Larry Finger f5e9c9ca54 Input: ALPS - add signature for HP ze1115
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2005-12-21 00:51:13 -05:00
Vojtech Pavlik ea54c96c04 [PATCH] Input: ALPS - correctly report button presses on Fujitsu Siemens S6010
Without this patch Forward and Backward buttons on the touchpad do not
generate any events.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-12-14 18:54:20 -08:00
Dmitry Torokhov 2e5b636bb5 [PATCH] drivers/input/mouse: convert to dynamic input_dev allocation
Input: convert drivers/input/mouse to dynamic input_dev allocation

This is required for input_dev sysfs integration

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-28 09:52:52 -07:00
Vojtech Pavlik e6c047b98b Input: ALPS - fix wheel decoding
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2005-09-04 01:40:43 -05:00
Peter Osterlund 963f626d46 Input: ALPS - unconditionally enable tapping mode
The condition in alps_init() was also inverted and the driver
was enabling tapping mode only if it was already enabled.

Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2005-07-11 01:08:04 -05:00
David Moore b30dc120a7 Input: ALPS - fix resume (for DualPoints)
The driver would not reset pass-through mode when performing
resume of a DualPoint touchpad causing it to stop working
until next reboot.

Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2005-07-11 01:07:48 -05:00
Linus Torvalds 3e0777b8fa Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/dtor/input.git manually
Some manual fixups required due to clashes with the PF_FREEZE cleanups.
2005-06-27 14:47:31 -07:00
Dmitry Torokhov e41fb09b2f [PATCH] ALPS: fix enabling hardware tapping
It looks like logic for enabling hardware tapping in ALPS driver was
inverted and we enable it only if it was already enabled by BIOS or
firmware.

I have a confirmation from one user that the patch below fixes the problem
for him and it might be beneficial if we could get it into 2.6.12.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-16 09:02:59 -07:00
Dmitry Torokhov c611763d04 Input: add ps2_drain() to libps2 to allow reading and discarding
given number of bytes from device. Change ps2_command to
       allow using 0 as command ID and actually pass it to the
       device instead of working as a drain.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2005-06-01 02:39:51 -05:00
Ivan Casado Ruiz c30b4c10d9 Input: ALPS - fix forward/back buttons on Ahtec laptop.
I have an Ahtec laptop with a ALPS GlidePoint device, with 4 buttons.
With Linux hernel 2.6.12rc4 and rc5 I'm unable to use the vertical
scroll buttons (BACK and FORWARD).

BACK gets detected as BTN_MIDDLE and FORWARD is undetected.

I've modified the drivers/input/mouse/alps.c from 2.6.12rc5 and now it
works fine!

Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2005-06-01 02:39:18 -05:00
Dmitry Torokhov 968ac842c4 Input: whitespace fixes in drivers/input/mouse
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2005-05-29 02:28:29 -05:00
Dmitry Torokhov f3a5c73d5e [PATCH] ALPS resume fix
ALPS needs to be reset for detection to work reliably when reconnecting.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-17 07:59:09 -07:00
Andrew Morton 64b14d3752 [PATCH] alps printk tidy
Make the alps printk output look consistent.

Cc: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-17 07:59:09 -07:00
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00