2019-08-25 10:49:19 +01:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2006-03-27 01:14:30 -08:00
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/*
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2007-10-16 01:27:00 -07:00
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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2005-04-16 15:20:36 -07:00
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*/
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#ifndef __IRQ_USER_H__
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#define __IRQ_USER_H__
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2012-10-08 03:27:32 +01:00
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#include <sysdep/ptrace.h>
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2006-07-10 04:45:09 -07:00
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2020-12-02 12:59:55 +01:00
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enum um_irq_type {
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IRQ_READ,
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IRQ_WRITE,
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NUM_IRQ_TYPES,
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};
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2017-11-20 21:17:58 +00:00
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2012-08-02 00:49:17 +02:00
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struct siginfo;
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extern void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
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um: time-travel/signals: fix ndelay() in interrupt
We should be able to ndelay() from any context, even from an
interrupt context! However, this is broken (not functionally,
but locking-wise) in time-travel because we'll get into the
time-travel code and enable interrupts to handle messages on
other time-travel aware subsystems (only virtio for now).
Luckily, I've already reworked the time-travel aware signal
(interrupt) delivery for suspend/resume to have a time travel
handler, which runs directly in the context of the signal and
not from the Linux interrupt.
In order to fix this time-travel issue then, we need to do a
few things:
1) rework the signal handling code to call time-travel handlers
(only) if interrupts are disabled but signals aren't blocked,
instead of marking it only pending there. This is needed to
not deadlock other communication.
2) rework time-travel to not enable interrupts while it's
waiting for a message;
3) rework time-travel to not (just) disable interrupts but
rather block signals at a lower level while it needs them
disabled for communicating with the controller.
Finally, since now we can actually spend even virtual time
in interrupts-disabled sections, the delay warning when we
deliver a time-travel delayed interrupt is no longer valid,
things can (and should) now get delayed.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
2021-03-05 13:19:56 +01:00
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void sigio_run_timetravel_handlers(void);
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2005-04-16 15:20:36 -07:00
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extern void free_irq_by_fd(int fd);
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extern void deactivate_fd(int fd, int irqnum);
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extern int deactivate_all_fds(void);
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[PATCH] uml: Simplify console opening/closing and irq registration
This patch simplifies the opening and closing of host console devices and the
registration and deregistration of IRQs. The intent is to make it obvious
that an IRQ can't exist without an open file descriptor.
chan_enable will now open the channel, and when both opening and IRQ
registration are desired, this should be used. Opening only is done for the
initial console, so that interface still needs to exist.
The free_irqs_later interface is now gone. It was intended to avoid freeing
an IRQ while it was being processed. It did this, but it didn't eliminate the
possiblity of free_irq being called from an interrupt, which is bad. In its
place is a list of irqs to be freed, which is processed by the signal handler
just before exiting. close_one_chan now disables irqs.
When a host device disappears, it is just closed, and that disables IRQs.
The device id registered with the IRQ is now the chan structure, not the tty.
This is because the interrupt arrives on a descriptor associated with the
channel. This caused equivalent changes in the arguments to line_timer_cb.
line_disable is gone since it is not used any more.
The count field in the line structure is gone. tty->count is used instead.
The complicated logic in sigio_handler with freeing IRQs when necessary and
making sure its idea of the next irq is correct is now much simpler. The irq
list can't be rearranged underneath it, so it is now a simple list walk.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:18:57 -08:00
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#endif
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