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linux-loongson/include/linux/irq.h
Thomas Gleixner 1f5a5b87f7 genirq: Implement a sane sparse_irq allocator 
The current sparse_irq allocator has several short comings due to
failures in the design or the lack of it:

 - Requires iteration over the number of active irqs to find a free slot
   (Some architectures have grown their own workarounds for this)
 - Removal of entries is not possible
 - Racy between create_irq_nr and destroy_irq (plugged by horrible
   callbacks)
 - Migration of active irq descriptors is not possible
 - No bulk allocation of irq ranges
 - Sprinkeled irq_desc references all over the place outside of kernel/irq/
   (The previous chip functions series is addressing this issue)

Implement a sane allocator which fixes the above short comings (though
migration of active descriptors needs a full tree wide cleanup of the
direct and mostly unlocked access to irq_desc).

The new allocator still uses a radix_tree, but uses a bitmap for
keeping track of allocated irq numbers. That allows:

 - Fast lookup of a free slot
 - Allows the removal of descriptors
 - Prevents the create/destroy race
 - Bulk allocation of consecutive irq ranges
 - Basic design is ready for migration of life descriptors after
   further cleanups

The bitmap is also used in the SPARSE_IRQ=n case for lookup and
raceless (de)allocation of irq numbers. So it removes the requirement
for looping through the descriptor array to find slots.

Right now it uses sparse_irq_lock to protect the bitmap and the radix
tree, but after cleaning up all users we should be able convert that
to a mutex and to switch the radix_tree and decriptor allocations to
GFP_KERNEL.

[ Folded in a bugfix from Yinghai Lu ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
2010-10-12 16:39:07 +02:00

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#ifndef _LINUX_IRQ_H
#define _LINUX_IRQ_H
/*
* Please do not include this file in generic code. There is currently
* no requirement for any architecture to implement anything held
* within this file.
*
* Thanks. --rmk
*/
#include <linux/smp.h>
#ifndef CONFIG_S390
#include <linux/linkage.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>
#include <linux/gfp.h>
#include <linux/irqreturn.h>
#include <linux/irqnr.h>
#include <linux/errno.h>
#include <linux/topology.h>
#include <linux/wait.h>
#include <asm/irq.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>
struct irq_desc;
typedef void (*irq_flow_handler_t)(unsigned int irq,
struct irq_desc *desc);
/*
* IRQ line status.
*
* Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
*
* IRQ types
*/
#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
#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_SENSE_MASK 0x0000000f /* Mask of the above */
#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
/* Internal flags */
#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
#define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */
#define IRQ_ONESHOT 0x08000000 /* IRQ is not unmasked after hardirq */
#define IRQ_NESTED_THREAD 0x10000000 /* IRQ is nested into another, no own handler thread */
#define IRQF_MODIFY_MASK \
(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL)
#ifdef CONFIG_IRQ_PER_CPU
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
#else
# define CHECK_IRQ_PER_CPU(var) 0
# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
#endif
struct msi_desc;
struct irq_2_iommu;
/**
* struct irq_data - per irq and irq chip data passed down to chip functions
* @irq: interrupt number
* @node: node index useful for balancing
* @chip: low level interrupt hardware access
* @handler_data: per-IRQ data for the irq_chip methods
* @chip_data: platform-specific per-chip private data for the chip
* methods, to allow shared chip implementations
* @msi_desc: MSI descriptor
* @affinity: IRQ affinity on SMP
* @irq_2_iommu: iommu with this irq
*
* The fields here need to overlay the ones in irq_desc until we
* cleaned up the direct references and switched everything over to
* irq_data.
*/
struct irq_data {
unsigned int irq;
unsigned int node;
struct irq_chip *chip;
void *handler_data;
void *chip_data;
struct msi_desc *msi_desc;
#ifdef CONFIG_SMP
cpumask_var_t affinity;
#endif
#ifdef CONFIG_INTR_REMAP
struct irq_2_iommu *irq_2_iommu;
#endif
};
/**
* struct irq_chip - hardware interrupt chip descriptor
*
* @name: name for /proc/interrupts
* @startup: deprecated, replaced by irq_startup
* @shutdown: deprecated, replaced by irq_shutdown
* @enable: deprecated, replaced by irq_enable
* @disable: deprecated, replaced by irq_disable
* @ack: deprecated, replaced by irq_ack
* @mask: deprecated, replaced by irq_mask
* @mask_ack: deprecated, replaced by irq_mask_ack
* @unmask: deprecated, replaced by irq_unmask
* @eoi: deprecated, replaced by irq_eoi
* @end: deprecated, will go away with __do_IRQ()
* @set_affinity: deprecated, replaced by irq_set_affinity
* @retrigger: deprecated, replaced by irq_retrigger
* @set_type: deprecated, replaced by irq_set_type
* @set_wake: deprecated, replaced by irq_wake
* @bus_lock: deprecated, replaced by irq_bus_lock
* @bus_sync_unlock: deprecated, replaced by irq_bus_sync_unlock
*
* @irq_startup: start up the interrupt (defaults to ->enable if NULL)
* @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
* @irq_enable: enable the interrupt (defaults to chip->unmask if NULL)
* @irq_disable: disable the interrupt
* @irq_ack: start of a new interrupt
* @irq_mask: mask an interrupt source
* @irq_mask_ack: ack and mask an interrupt source
* @irq_unmask: unmask an interrupt source
* @irq_eoi: end of interrupt
* @irq_set_affinity: set the CPU affinity on SMP machines
* @irq_retrigger: resend an IRQ to the CPU
* @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
* @irq_set_wake: enable/disable power-management wake-on of an IRQ
* @irq_bus_lock: function to lock access to slow bus (i2c) chips
* @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
*
* @release: release function solely used by UML
*/
struct irq_chip {
const char *name;
#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
unsigned int (*startup)(unsigned int irq);
void (*shutdown)(unsigned int irq);
void (*enable)(unsigned int irq);
void (*disable)(unsigned int irq);
void (*ack)(unsigned int irq);
void (*mask)(unsigned int irq);
void (*mask_ack)(unsigned int irq);
void (*unmask)(unsigned int irq);
void (*eoi)(unsigned int irq);
void (*end)(unsigned int irq);
int (*set_affinity)(unsigned int irq,
const struct cpumask *dest);
int (*retrigger)(unsigned int irq);
int (*set_type)(unsigned int irq, unsigned int flow_type);
int (*set_wake)(unsigned int irq, unsigned int on);
void (*bus_lock)(unsigned int irq);
void (*bus_sync_unlock)(unsigned int irq);
#endif
unsigned int (*irq_startup)(struct irq_data *data);
void (*irq_shutdown)(struct irq_data *data);
void (*irq_enable)(struct irq_data *data);
void (*irq_disable)(struct irq_data *data);
void (*irq_ack)(struct irq_data *data);
void (*irq_mask)(struct irq_data *data);
void (*irq_mask_ack)(struct irq_data *data);
void (*irq_unmask)(struct irq_data *data);
void (*irq_eoi)(struct irq_data *data);
int (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
int (*irq_retrigger)(struct irq_data *data);
int (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
int (*irq_set_wake)(struct irq_data *data, unsigned int on);
void (*irq_bus_lock)(struct irq_data *data);
void (*irq_bus_sync_unlock)(struct irq_data *data);
/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
void (*release)(unsigned int irq, void *dev_id);
#endif
};
/* This include will go away once we isolated irq_desc usage to core code */
#include <linux/irqdesc.h>
/*
* Pick up the arch-dependent methods:
*/
#include <asm/hw_irq.h>
#ifndef ARCH_IRQ_INIT_FLAGS
# define ARCH_IRQ_INIT_FLAGS 0
#endif
#define IRQ_DEFAULT_INIT_FLAGS (IRQ_DISABLED | ARCH_IRQ_INIT_FLAGS)
struct irqaction;
extern int setup_irq(unsigned int irq, struct irqaction *new);
extern void remove_irq(unsigned int irq, struct irqaction *act);
#ifdef CONFIG_GENERIC_HARDIRQS
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
void move_native_irq(int irq);
void move_masked_irq(int irq);
#else
static inline void move_native_irq(int irq) { }
static inline void move_masked_irq(int irq) { }
#endif
extern int no_irq_affinity;
/* Handle irq action chains: */
extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
/*
* Built-in IRQ handlers for various IRQ types,
* callable via desc->handle_irq()
*/
extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
extern void handle_nested_irq(unsigned int irq);
/* Handling of unhandled and spurious interrupts: */
extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
irqreturn_t action_ret);
/* Enable/disable irq debugging output: */
extern int noirqdebug_setup(char *str);
/* Checks whether the interrupt can be requested by request_irq(): */
extern int can_request_irq(unsigned int irq, unsigned long irqflags);
/* Dummy irq-chip implementations: */
extern struct irq_chip no_irq_chip;
extern struct irq_chip dummy_irq_chip;
extern void
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
irq_flow_handler_t handle);
extern void
set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
irq_flow_handler_t handle, const char *name);
extern void
__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
const char *name);
/*
* Set a highlevel flow handler for a given IRQ:
*/
static inline void
set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
{
__set_irq_handler(irq, handle, 0, NULL);
}
/*
* Set a highlevel chained flow handler for a given IRQ.
* (a chained handler is automatically enabled and set to
* IRQ_NOREQUEST and IRQ_NOPROBE)
*/
static inline void
set_irq_chained_handler(unsigned int irq,
irq_flow_handler_t handle)
{
__set_irq_handler(irq, handle, 1, NULL);
}
extern void set_irq_nested_thread(unsigned int irq, int nest);
void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
{
irq_modify_status(irq, 0, set);
}
static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
{
irq_modify_status(irq, clr, 0);
}
static inline void set_irq_noprobe(unsigned int irq)
{
irq_modify_status(irq, 0, IRQ_NOPROBE);
}
static inline void set_irq_probe(unsigned int irq)
{
irq_modify_status(irq, IRQ_NOPROBE, 0);
}
/* Handle dynamic irq creation and destruction */
extern unsigned int create_irq_nr(unsigned int irq_want, int node);
extern int create_irq(void);
extern void destroy_irq(unsigned int irq);
/* Dynamic irq helper functions */
extern void dynamic_irq_init(unsigned int irq);
void dynamic_irq_init_keep_chip_data(unsigned int irq);
extern void dynamic_irq_cleanup(unsigned int irq);
void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);
/* Set/get chip/data for an IRQ: */
extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
extern int set_irq_data(unsigned int irq, void *data);
extern int set_irq_chip_data(unsigned int irq, void *data);
extern int set_irq_type(unsigned int irq, unsigned int type);
extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
extern struct irq_data *irq_get_irq_data(unsigned int irq);
static inline struct irq_chip *get_irq_chip(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->chip : NULL;
}
static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
{
return d->chip;
}
static inline void *get_irq_chip_data(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->chip_data : NULL;
}
static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
{
return d->chip_data;
}
static inline void *get_irq_data(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->handler_data : NULL;
}
static inline void *irq_data_get_irq_data(struct irq_data *d)
{
return d->handler_data;
}
static inline struct msi_desc *get_irq_msi(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->msi_desc : NULL;
}
static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
{
return d->msi_desc;
}
#ifdef CONFIG_INTR_REMAP
static inline struct irq_2_iommu *get_irq_iommu(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->irq_2_iommu : NULL;
}
static inline struct irq_2_iommu *irq_data_get_iommu(struct irq_data *d)
{
return d->irq_2_iommu;
}
#endif
int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
void irq_free_descs(unsigned int irq, unsigned int cnt);
static inline int irq_alloc_desc(int node)
{
return irq_alloc_descs(-1, 0, 1, node);
}
static inline int irq_alloc_desc_at(unsigned int at, int node)
{
return irq_alloc_descs(at, at, 1, node);
}
static inline int irq_alloc_desc_from(unsigned int from, int node)
{
return irq_alloc_descs(-1, from, 1, node);
}
static inline void irq_free_desc(unsigned int irq)
{
irq_free_descs(irq, 1);
}
#endif /* CONFIG_GENERIC_HARDIRQS */
#endif /* !CONFIG_S390 */
#endif /* _LINUX_IRQ_H */
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