Blame view
kernel/irq/resend.c
1.93 KB
a4633adcd [PATCH] genirq: a... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 |
/* * linux/kernel/irq/resend.c * * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar * Copyright (C) 2005-2006, Thomas Gleixner * * This file contains the IRQ-resend code * * If the interrupt is waiting to be processed, we try to re-run it. * We can't directly run it from here since the caller might be in an * interrupt-protected region. Not all irq controller chips can * retrigger interrupts at the hardware level, so in those cases * we allow the resending of IRQs via a tasklet. */ #include <linux/irq.h> #include <linux/module.h> #include <linux/random.h> #include <linux/interrupt.h> #include "internals.h" #ifdef CONFIG_HARDIRQS_SW_RESEND /* Bitmap to handle software resend of interrupts: */ |
c1ee62642 genirq: Prevent a... |
26 |
static DECLARE_BITMAP(irqs_resend, IRQ_BITMAP_BITS); |
a4633adcd [PATCH] genirq: a... |
27 28 29 30 31 32 33 34 |
/* * Run software resends of IRQ's */ static void resend_irqs(unsigned long arg) { struct irq_desc *desc; int irq; |
85c0f9097 irq: introduce nr... |
35 36 |
while (!bitmap_empty(irqs_resend, nr_irqs)) { irq = find_first_bit(irqs_resend, nr_irqs); |
a4633adcd [PATCH] genirq: a... |
37 |
clear_bit(irq, irqs_resend); |
08678b084 generic: sparse i... |
38 |
desc = irq_to_desc(irq); |
6a6de9ef5 [PATCH] genirq: core |
39 |
local_irq_disable(); |
e317c8cca [PATCH] ixp4xxdef... |
40 |
desc->handle_irq(irq, desc); |
6a6de9ef5 [PATCH] genirq: core |
41 |
local_irq_enable(); |
a4633adcd [PATCH] genirq: a... |
42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 |
} } /* Tasklet to handle resend: */ static DECLARE_TASKLET(resend_tasklet, resend_irqs, 0); #endif /* * IRQ resend * * Is called with interrupts disabled and desc->lock held. */ void check_irq_resend(struct irq_desc *desc, unsigned int irq) { |
a4633adcd [PATCH] genirq: a... |
57 |
/* |
2464286ac genirq: suppress ... |
58 59 60 61 |
* We do not resend level type interrupts. Level type * interrupts are resent by hardware when they are still * active. */ |
876dbd4cc genirq: Mirror ir... |
62 |
if (irq_settings_is_level(desc)) |
87923470c genirq: Consolida... |
63 |
return; |
163ef3091 genirq: Move IRQ_... |
64 65 |
if (desc->istate & IRQS_REPLAY) return; |
2a0d6fb33 genirq: Move IRQ_... |
66 |
if (desc->istate & IRQS_PENDING) { |
2a0d6fb33 genirq: Move IRQ_... |
67 |
desc->istate &= ~IRQS_PENDING; |
163ef3091 genirq: Move IRQ_... |
68 |
desc->istate |= IRQS_REPLAY; |
a4633adcd [PATCH] genirq: a... |
69 |
|
21e2b8c62 genirq: Provide c... |
70 71 |
if (!desc->irq_data.chip->irq_retrigger || !desc->irq_data.chip->irq_retrigger(&desc->irq_data)) { |
a4633adcd [PATCH] genirq: a... |
72 73 74 75 76 77 78 79 |
#ifdef CONFIG_HARDIRQS_SW_RESEND /* Set it pending and activate the softirq: */ set_bit(irq, irqs_resend); tasklet_schedule(&resend_tasklet); #endif } } } |