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genirq: Mirror irq trigger type bits in irq_data.state

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That's the data structure chip functions get provided. Also allow them
to signal the core code that they updated the flags in irq_data.state
by returning IRQ_SET_MASK_OK_NOCOPY. The default is unchanged.

The type bits should be accessed via:

val = irqd_get_trigger_type(irqdata);
and
irqd_set_trigger_type(irqdata, val);

Coders who access them directly will be tracked down and slapped with
stinking trouts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2011-02-08 17:28:12 +01:00
parent 2bdd10558c
commit 876dbd4cc1
5 changed files with 87 additions and 20 deletions
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26
include/linux/irq.h
View File

@ -46,7 +46,9 @@ typedef void (*irq_flow_handler_t)(unsigned int irq,
#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
#define IRQ_TYPE_LEVEL_MASK (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)
#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
/* Internal flags */
@ -131,17 +133,20 @@ struct irq_data {
/*
* Bit masks for irq_data.state
*
* IRQD_TRIGGER_MASK - Mask for the trigger type bits
* IRQD_SETAFFINITY_PENDING - Affinity setting is pending
* IRQD_NO_BALANCING - Balancing disabled for this IRQ
* IRQD_PER_CPU - Interrupt is per cpu
* IRQD_AFFINITY_SET - Interrupt affinity was set
* IRQD_LEVEL - Interrupt is level triggered
*/
enum {
/* Bit 0 - 7 reserved for TYPE will use later */
IRQD_TRIGGER_MASK = 0xf,
IRQD_SETAFFINITY_PENDING = (1 << 8),
IRQD_NO_BALANCING = (1 << 10),
IRQD_PER_CPU = (1 << 11),
IRQD_AFFINITY_SET = (1 << 12),
IRQD_LEVEL = (1 << 13),
};
static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
@ -164,6 +169,25 @@ static inline bool irqd_affinity_was_set(struct irq_data *d)
return d->state_use_accessors & IRQD_AFFINITY_SET;
}
static inline u32 irqd_get_trigger_type(struct irq_data *d)
{
return d->state_use_accessors & IRQD_TRIGGER_MASK;
}
/*
* Must only be called inside irq_chip.irq_set_type() functions.
*/
static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
{
d->state_use_accessors &= ~IRQD_TRIGGER_MASK;
d->state_use_accessors |= type & IRQD_TRIGGER_MASK;
}
static inline bool irqd_is_level_type(struct irq_data *d)
{
return d->state_use_accessors & IRQD_LEVEL;
}
/**
* struct irq_chip - hardware interrupt chip descriptor
*

5
kernel/irq/chip.c
View File

@ -710,11 +710,14 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
irq_settings_clr_and_set(desc, clr, set);
irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU);
irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
IRQD_TRIGGER_MASK | IRQD_LEVEL);
if (irq_settings_has_no_balance_set(desc))
irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
if (irq_settings_is_per_cpu(desc))
irqd_set(&desc->irq_data, IRQD_PER_CPU);
irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
raw_spin_unlock_irqrestore(&desc->lock, flags);
}

44
kernel/irq/manage.c
View File

@ -567,23 +567,32 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
return 0;
}
flags &= IRQ_TYPE_SENSE_MASK;
/* caller masked out all except trigger mode flags */
ret = chip->irq_set_type(&desc->irq_data, flags);
if (ret)
pr_err("setting trigger mode %lu for irq %u failed (%pF)\n",
flags, irq, chip->irq_set_type);
else {
if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
flags |= IRQ_LEVEL;
/* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
desc->status |= flags;
switch (ret) {
case IRQ_SET_MASK_OK:
irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK);
irqd_set(&desc->irq_data, flags);
case IRQ_SET_MASK_OK_NOCOPY:
flags = irqd_get_trigger_type(&desc->irq_data);
irq_settings_set_trigger_mask(desc, flags);
irqd_clear(&desc->irq_data, IRQD_LEVEL);
irq_settings_clr_level(desc);
if (flags & IRQ_TYPE_LEVEL_MASK) {
irq_settings_set_level(desc);
irqd_set(&desc->irq_data, IRQD_LEVEL);
}
if (chip != desc->irq_data.chip)
irq_chip_set_defaults(desc->irq_data.chip);
return 0;
default:
pr_err("setting trigger mode %lu for irq %u failed (%pF)\n",
flags, irq, chip->irq_set_type);
}
return ret;
}
@ -923,13 +932,14 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
/* Set default affinity mask once everything is setup */
setup_affinity(irq, desc, mask);
} else if ((new->flags & IRQF_TRIGGER_MASK)
&& (new->flags & IRQF_TRIGGER_MASK)
!= (desc->status & IRQ_TYPE_SENSE_MASK)) {
/* hope the handler works with the actual trigger mode... */
pr_warning("IRQ %d uses trigger mode %d; requested %d\n",
irq, (int)(desc->status & IRQ_TYPE_SENSE_MASK),
(int)(new->flags & IRQF_TRIGGER_MASK));
} else if (new->flags & IRQF_TRIGGER_MASK) {
unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
unsigned int omsk = irq_settings_get_trigger_mask(desc);
if (nmsk != omsk)
/* hope the handler works with current trigger mode */
pr_warning("IRQ %d uses trigger mode %u; requested %u\n",
irq, nmsk, omsk);
}
new->irq = irq;

2
kernel/irq/resend.c
View File

@ -60,7 +60,7 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
* interrupts are resent by hardware when they are still
* active.
*/
if (desc->status & IRQ_LEVEL)
if (irq_settings_is_level(desc))
return;
if (desc->istate & IRQS_REPLAY)
return;

30
kernel/irq/settings.h
View File

@ -5,6 +5,7 @@
enum {
_IRQ_DEFAULT_INIT_FLAGS = IRQ_DEFAULT_INIT_FLAGS,
_IRQ_PER_CPU = IRQ_PER_CPU,
_IRQ_LEVEL = IRQ_LEVEL,
_IRQ_NO_BALANCING = IRQ_NO_BALANCING,
_IRQF_MODIFY_MASK = IRQF_MODIFY_MASK,
};
@ -31,6 +32,8 @@ enum {
#define IRQ_NO_BALANCING GOT_YOU_MORON
#undef IRQ_AFFINITY_SET
#define IRQ_AFFINITY_SET GOT_YOU_MORON
#undef IRQ_LEVEL
#define IRQ_LEVEL GOT_YOU_MORON
#undef IRQF_MODIFY_MASK
#define IRQF_MODIFY_MASK GOT_YOU_MORON
@ -60,3 +63,30 @@ static inline bool irq_settings_has_no_balance_set(struct irq_desc *desc)
{
return desc->status & _IRQ_NO_BALANCING;
}
static inline u32 irq_settings_get_trigger_mask(struct irq_desc *desc)
{
return desc->status & IRQ_TYPE_SENSE_MASK;
}
static inline void
irq_settings_set_trigger_mask(struct irq_desc *desc, u32 mask)
{
desc->status &= ~IRQ_TYPE_SENSE_MASK;
desc->status |= mask & IRQ_TYPE_SENSE_MASK;
}
static inline bool irq_settings_is_level(struct irq_desc *desc)
{
return desc->status & _IRQ_LEVEL;
}
static inline void irq_settings_clr_level(struct irq_desc *desc)
{
desc->status &= ~_IRQ_LEVEL;
}
static inline void irq_settings_set_level(struct irq_desc *desc)
{
desc->status |= _IRQ_LEVEL;
}