Commit graph

14 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
Tobias Klauser
2ad3479dec [PATCH] sound/mips/au1x00: Use ARRAY_SIZE macro
Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0])

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-29 09:18:14 -07:00
Thomas Gleixner
65ca68b300 [PATCH] irq-flags: sound: Use the new IRQF_ constants
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Jaroslav Kysela <perex@suse.cz>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-02 13:58:54 -07:00
Sergei Shtylyov
c5c079e31c [ALSA] AMD Au1x00: AC'97 controller is memory mapped
Modules: MIPS AU1x00 driver

AMD Au1x00 ALSA driver erroneously calls request_region() for AC'97
controller registers -- the controller is actually memory mapped at
addresses 0x10000000 thru 0x100FFFFF.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2006-03-22 10:43:28 +01:00
Sergei Shtylyov
bb160b850d [ALSA] AMD Au1x00: fix DMA init/cleanup
Modules: MIPS AU1x00 driver

AMD Au1x00 ALSA driver causes kernel oops in au1000_init() by trying
to set DMA channel to -1 in yet unallocated audio streams. Here's the
patch that staightens up DMA init/cleanup code.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2006-03-22 10:43:02 +01:00
Sergei Shtylylov
d8327c784b [ALSA] AMD Au1x00: make driver build after cleanup
Modules: MIPS AU1x00 driver

AMD Au1x00 ALSA driver doesn't build after the recent code cleanup:

sound/mips/au1x00.c: In function 'au1000_setup_dma_link':
sound/mips/au1x00.c:173: error: 'pointer' undeclared (first use in this function)
sound/mips/au1x00.c:173: error: (Each undeclared identifier is reported only once
sound/mips/au1x00.c:173: error: for each function it appears in.)
sound/mips/au1x00.c: In function 'snd_au1000_hw_params':
sound/mips/au1x00.c:339: warning: implicit declaration of function 'snd_mask_min'

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2006-03-22 10:39:36 +01:00
Takashi Iwai
ebfbd2b83d [ALSA] Remove snd_card_generic_dev()
Remove the obsolete snd_card_generic_dev().
CONFIG_SND_GENERIC_DRIVER is also removed from Kconfig.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2006-01-03 12:28:50 +01:00
Takashi Iwai
a0d6f880fa [ALSA] Remove xxx_t typedefs: MIPS AU1x00
Modules: MIPS AU1x00 driver

Remove xxx_t typedefs from the MIPS AU1x00 driver.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2006-01-03 12:20:12 +01:00
Takashi Iwai
33ea25c113 [ALSA] au1x00 - Code clean up
Modules: MIPS AU1x00 driver

Clean up snd-au1x00 driver code:

- Remove global variables
- Remove old compatibility codes
- Fix DMA-link allocation/release functions in hw_params and hw_free
  callbacks (they may be called multiple times)
- Fix spinlocks

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2006-01-03 12:16:51 +01:00
Konstantin Baydarov
708f997169 [ALSA] AMD Au1x00 driver: buggy spinlocks
Modules: MIPS AU1x00 driver

AMD Au1x00 ALSA driver fails compilation with the alternate spinlock
implementation because it doesn't do locking/unlocking correctly in some
places (passes spinlock by value).

Signed-off-by: Konstantin Baydarov <kbaidarov@ru.mvista.com>
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2005-11-04 13:20:26 +01:00
Takashi Iwai
063859c854 [ALSA] Remove obsolete chip_t
Modules: Documentation,MIPS AU1x00 driver,PPC Beep,SPARC DBRI driver

Removed the use of chip_t, which was obsoleted.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2005-11-04 13:18:51 +01:00
Takashi Iwai
b1d5776d86 [ALSA] Remove vmalloc wrapper, kfree_nocheck()
- Remove vmalloc wrapper
- Add release_and_free_resource() to remove kfree_nocheck() from each driver
  and simplify the code

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2005-11-04 13:18:00 +01:00
Takashi Iwai
16dab54b8c [ALSA] Add snd_card_set_generic_dev() call
ARM,SA11xx UDA1341 driver,Generic drivers,MPU401 UART,MIPS
MIPS AU1x00 driver,PPC,PPC PowerMac driver,SPARC,SPARC AMD7930 driver
SPARC cs4231 driver,SPARC DBRI driver
- Added snd_card_set_generic_dev() call.
- Added SND_GENERIC_DRIVER to Kconfig.
- Clean up the error path in probe if necessary.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2005-09-12 10:41:56 +02:00
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