2017-11-06 18:11:51 +01:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-15 23:53:32 -07:00
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2005-04-16 15:20:36 -07:00
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2023-07-24 14:54:38 -06:00
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2005-04-16 15:20:36 -07:00
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2021-05-13 11:01:42 +08:00
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2005-04-16 15:20:36 -07:00
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2012-03-28 18:30:03 +01:00
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2005-04-16 15:20:36 -07:00
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2012-02-09 18:48:19 -05:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2022-03-03 09:08:31 +01:00
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2010-05-20 21:04:23 -05:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2020-08-23 17:36:59 -05:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2013-10-08 16:14:21 -07:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:03 +01:00
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[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 20:54:13 -08:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2013-01-03 15:53:03 +01:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 20:54:13 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 20:54:13 -08:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 20:54:13 -08:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 20:54:13 -08:00
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2005-04-16 15:20:36 -07:00
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TTY: serial, stop accessing potential NULLs
The following commits:
* 6732c8bb8671acbdac6cdc93dd72ddd581dd5e25 (TTY: switch
tty_schedule_flip)
* 2e124b4a390ca85325fae75764bef92f0547fa25 (TTY: switch
tty_flip_buffer_push)
* 05c7cd39907184328f48d3e7899f9cdd653ad336 (TTY: switch
tty_insert_flip_string)
* 92a19f9cec9a80ad93c06e115822deb729e2c6ad (TTY: switch
tty_insert_flip_char)
* 227434f8986c3827a1faedd1feb437acd6285315 (TTY: switch
tty_buffer_request_room to tty_port)
introduced a potential NULL dereference to some drivers. In
particular, when the device is used as a console, incoming bytes can
kill the box. This is caused by removed checks for TTY against NULL.
It happened because it was unclear to me why the checks were there. I
assumed them superfluous because the interrupts were unbound or
otherwise stopped. But this is not the case for consoles for these
drivers, as was pointed out by David Miller.
Now, this patch re-introduces the checks (at this point we check
port->state, not the tty proper, as we do not care about tty pointers
anymore). For both of the drivers, we place the check below the
handling of break signal so that sysrq can actually work. (One needs
to issue a break and then sysrq key within the following 5 seconds.)
We do not change sc26xx, sunhv, and sunsu here because they behave the
same as before. People having that hardware should fix the driver
eventually, however. They always could unconditionally dereference tty
in receive_chars, port->state in uart_handle_dcd_change, and
up->port.state->port.tty.
There is perhaps more to fix in all those drivers, but they are at
least in a state they were before.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-14 00:30:34 +01:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:03 +01:00
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2005-04-16 15:20:36 -07:00
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[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-09 20:54:13 -08:00
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2013-01-03 15:53:03 +01:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2009-09-19 13:13:31 -07:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2011-03-30 22:57:33 -03:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2009-09-19 13:13:28 -07:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2005-10-10 20:43:22 -07:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
|
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|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
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 14:55:46 +01:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2013-01-03 15:53:06 +01:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-29 09:42:38 +01:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-06-29 09:42:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-06-29 09:42:38 +01:00
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2023-09-14 20:44:26 +02:06
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2005-06-29 09:42:38 +01:00
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2005-04-16 15:20:36 -07:00
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2005-06-29 09:42:38 +01:00
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2005-04-16 15:20:36 -07:00
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2014-10-05 19:19:48 +02:00
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2005-04-16 15:20:36 -07:00
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2005-08-31 10:12:14 +01:00
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2005-04-16 15:20:36 -07:00
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2014-10-05 19:19:48 +02:00
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2005-04-16 15:20:36 -07:00
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2005-08-31 10:12:14 +01:00
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2005-04-16 15:20:36 -07:00
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2014-10-05 19:19:48 +02:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2014-07-06 11:29:52 -04:00
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2024-04-05 08:08:23 +02:00
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2005-04-16 15:20:36 -07:00
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2024-04-05 08:08:23 +02:00
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2005-04-16 15:20:36 -07:00
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2014-10-05 19:19:48 +02:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2014-10-05 19:19:48 +02:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2013-10-08 16:14:21 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2014-06-16 08:10:41 -04:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:38:45 -08:00
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2022-08-16 14:57:37 +03:00
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2005-04-16 15:20:36 -07:00
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2014-10-05 19:19:48 +02:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2010-05-20 21:04:23 -05:00
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2014-10-05 19:19:48 +02:00
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2010-05-20 21:04:23 -05:00
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2014-10-05 19:19:48 +02:00
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2010-05-20 21:04:23 -05:00
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2017-01-25 23:18:52 +05:30
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2005-04-16 15:20:36 -07:00
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2010-05-20 21:04:23 -05:00
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2005-04-16 15:20:36 -07:00
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2008-04-24 03:37:51 -07:00
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2005-04-16 15:20:36 -07:00
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2008-05-01 01:14:27 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-11 03:37:04 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2022-03-03 09:08:31 +01:00
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2005-04-16 15:20:36 -07:00
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2006-10-10 22:44:47 +01:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-20 20:00:09 +00:00
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2005-04-16 15:20:36 -07:00
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2007-07-15 23:53:32 -07:00
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2014-03-04 15:28:35 -05:00
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2023-09-14 20:44:26 +02:06
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2014-03-04 15:28:35 -05:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2006-03-20 20:00:09 +00:00
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2005-04-16 15:20:36 -07:00
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2007-07-15 23:53:32 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2006-08-23 15:53:39 -07:00
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2020-06-18 19:47:48 +03:00
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2006-08-23 15:53:39 -07:00
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2005-04-16 15:20:36 -07:00
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2010-08-06 09:25:50 -06:00
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2005-04-16 15:20:36 -07:00
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2013-10-08 16:14:21 -07:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2006-10-10 14:44:01 -07:00
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2005-04-16 15:20:36 -07:00
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2006-02-13 20:09:10 -08:00
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2006-10-10 14:44:01 -07:00
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2006-02-13 20:09:10 -08:00
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2005-04-16 15:20:36 -07:00
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2006-02-13 20:09:10 -08:00
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2005-04-16 15:20:36 -07:00
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2012-11-19 13:21:50 -05:00
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2005-04-16 15:20:36 -07:00
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2006-07-19 22:55:08 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 13:49:04 -07:00
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2005-04-16 15:20:36 -07:00
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2012-11-19 13:21:50 -05:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2006-07-19 22:55:08 -07:00
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2006-06-29 15:13:17 -07:00
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2022-08-18 23:01:12 +02:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2022-08-18 23:01:12 +02:00
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2005-04-16 15:20:36 -07:00
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2022-08-18 23:01:12 +02:00
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2006-07-19 22:55:08 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2012-11-19 13:21:50 -05:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-19 22:55:08 -07:00
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2007-05-09 13:49:04 -07:00
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2008-04-26 23:10:19 -07:00
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2007-05-09 13:49:04 -07:00
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2006-06-29 15:13:17 -07:00
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2007-05-09 13:49:04 -07:00
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2006-06-29 15:13:17 -07:00
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2007-05-09 13:49:04 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2023-09-14 20:44:26 +02:06
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2005-04-16 15:20:36 -07:00
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2006-07-19 22:55:08 -07:00
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2005-04-16 15:20:36 -07:00
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2012-01-26 17:44:09 +00:00
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2006-06-29 15:13:40 -07:00
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2012-11-19 13:21:50 -05:00
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2005-04-16 15:20:36 -07:00
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2008-04-24 03:37:51 -07:00
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2006-06-29 15:13:17 -07:00
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2008-04-24 03:37:51 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2023-03-10 08:47:26 -06:00
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2006-07-19 22:55:08 -07:00
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2008-04-24 03:37:51 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2012-01-26 17:44:09 +00:00
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2010-06-18 11:09:58 -06:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2010-06-18 11:09:58 -06:00
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2006-06-29 15:13:17 -07:00
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2019-12-13 00:06:47 +00:00
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2006-07-19 22:55:08 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2010-06-18 11:09:58 -06:00
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2006-06-29 15:13:17 -07:00
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2019-12-13 00:06:47 +00:00
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2006-07-19 22:55:08 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-19 22:55:08 -07:00
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2010-04-13 16:12:29 -07:00
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2009-11-24 14:03:34 -08:00
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2007-07-20 16:59:26 -07:00
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2006-06-29 15:13:17 -07:00
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2006-12-28 21:01:32 -08:00
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2006-06-29 15:13:17 -07:00
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2010-04-13 16:12:29 -07:00
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2009-11-24 14:03:34 -08:00
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2007-07-20 16:59:26 -07:00
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2006-06-29 15:13:17 -07:00
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2006-12-28 21:01:32 -08:00
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2006-06-29 15:13:17 -07:00
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2008-04-24 03:37:51 -07:00
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2006-07-19 22:55:08 -07:00
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2007-08-25 15:17:31 -07:00
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2007-05-09 13:49:04 -07:00
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2009-03-24 16:38:21 -07:00
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2007-08-25 15:17:31 -07:00
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2010-06-18 11:09:58 -06:00
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2007-08-25 15:17:31 -07:00
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2007-05-09 13:49:04 -07:00
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2009-03-24 16:38:21 -07:00
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2007-08-25 15:17:31 -07:00
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2010-06-18 11:09:58 -06:00
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2008-04-24 03:37:51 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2013-05-23 19:39:36 +09:00
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2006-06-29 15:13:40 -07:00
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2005-04-16 15:20:36 -07:00
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2012-11-19 13:26:18 -05:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:13:17 -07:00
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2006-06-29 15:13:40 -07:00
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2006-06-29 15:13:17 -07:00
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2023-11-10 16:30:15 +01:00
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2006-06-29 15:13:40 -07:00
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2013-05-23 19:39:36 +09:00
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2006-06-29 15:13:40 -07:00
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2006-06-29 15:13:17 -07:00
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2006-06-29 15:13:40 -07:00
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2006-12-28 21:01:32 -08:00
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2006-06-29 15:13:17 -07:00
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2008-08-31 01:23:17 -07:00
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2006-06-29 15:13:17 -07:00
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2011-02-22 21:10:26 -07:00
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2010-04-13 16:13:02 -07:00
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2006-06-29 15:13:17 -07:00
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2024-10-07 22:58:04 +02:00
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2006-06-29 15:13:17 -07:00
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2008-04-24 03:37:51 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2006-07-19 22:55:08 -07:00
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2007-12-11 03:37:04 -08:00
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2023-03-10 08:47:26 -06:00
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2006-07-19 22:55:08 -07:00
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2006-06-29 15:13:17 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2006-07-17 21:07:17 -07:00
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2006-06-29 15:13:17 -07:00
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2008-04-24 03:37:51 -07:00
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2006-06-29 15:13:17 -07:00
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2008-04-24 03:37:51 -07:00
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2006-07-17 21:07:17 -07:00
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2005-04-16 15:20:36 -07:00
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2011-02-22 21:10:26 -07:00
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2006-07-17 21:07:17 -07:00
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2012-04-04 09:35:06 +02:00
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2007-05-09 13:49:04 -07:00
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2006-07-17 21:07:17 -07:00
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2007-05-09 13:49:04 -07:00
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2006-07-17 21:07:17 -07:00
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2011-02-22 21:10:26 -07:00
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2006-07-17 21:07:17 -07:00
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2007-12-11 03:37:04 -08:00
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2006-07-17 21:07:17 -07:00
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2006-06-29 15:13:17 -07:00
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2011-02-22 21:10:26 -07:00
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2006-06-29 15:13:17 -07:00
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2012-04-04 09:35:06 +02:00
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2007-05-09 13:49:04 -07:00
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2006-06-29 15:13:40 -07:00
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2012-01-26 17:44:09 +00:00
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2006-06-29 15:13:40 -07:00
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2007-12-11 03:37:04 -08:00
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2006-06-29 15:13:17 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-29 15:14:17 -07:00
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2005-04-16 15:20:36 -07:00
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