2 * linux/arch/ia64/kernel/irq.c
4 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
6 * This file contains the code used by various IRQ handling routines:
7 * asking for different IRQ's should be done through these routines
8 * instead of just grabbing them. Thus setups with different IRQ numbers
9 * shouldn't result in any weird surprises, and installing new handlers
14 * (mostly architecture independent, will move to kernel/irq.c in 2.5.)
16 * IRQs are in fact implemented a bit like signal handlers for the kernel.
17 * Naturally it's not a 1:1 relation, but there are similarities.
20 #include <linux/config.h>
21 #include <linux/ptrace.h>
22 #include <linux/errno.h>
23 #include <linux/signal.h>
24 #include <linux/sched.h>
25 #include <linux/ioport.h>
26 #include <linux/interrupt.h>
27 #include <linux/timex.h>
28 #include <linux/malloc.h>
29 #include <linux/random.h>
30 #include <linux/smp_lock.h>
31 #include <linux/init.h>
32 #include <linux/kernel_stat.h>
33 #include <linux/irq.h>
34 #include <linux/proc_fs.h>
38 #include <asm/system.h>
39 #include <asm/bitops.h>
40 #include <asm/uaccess.h>
41 #include <asm/pgalloc.h>
42 #include <asm/delay.h>
48 * Linux has a controller-independent x86 interrupt architecture.
49 * every controller has a 'controller-template', that is used
50 * by the main code to do the right thing. Each driver-visible
51 * interrupt source is transparently wired to the apropriate
52 * controller. Thus drivers need not be aware of the
53 * interrupt-controller.
55 * Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC,
56 * PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC.
57 * (IO-APICs assumed to be messaging to Pentium local-APICs)
59 * the code is designed to be easily extended with new/different
60 * interrupt controllers, without having to do assembly magic.
64 * Controller mappings for all interrupt sources:
66 irq_desc_t irq_desc
[NR_IRQS
] __cacheline_aligned
=
67 { [0 ... NR_IRQS
-1] = { IRQ_DISABLED
, &no_irq_type
, NULL
, 0, SPIN_LOCK_UNLOCKED
}};
69 static void register_irq_proc (unsigned int irq
);
72 * Special irq handlers.
75 void no_action(int cpl
, void *dev_id
, struct pt_regs
*regs
) { }
78 * Generic no controller code
81 static void enable_none(unsigned int irq
) { }
82 static unsigned int startup_none(unsigned int irq
) { return 0; }
83 static void disable_none(unsigned int irq
) { }
84 static void ack_none(unsigned int irq
)
87 * 'what should we do if we get a hw irq event on an illegal vector'.
88 * each architecture has to answer this themselves, it doesnt deserve
89 * a generic callback i think.
92 printk("unexpected IRQ trap at vector %02x\n", irq
);
93 #ifdef CONFIG_X86_LOCAL_APIC
95 * Currently unexpected vectors happen only on SMP and APIC.
96 * We _must_ ack these because every local APIC has only N
97 * irq slots per priority level, and a 'hanging, unacked' IRQ
98 * holds up an irq slot - in excessive cases (when multiple
99 * unexpected vectors occur) that might lock up the APIC
106 printk("Unexpected irq vector 0x%x on CPU %u!\n", irq
, smp_processor_id());
110 /* startup is the same as "enable", shutdown is same as "disable" */
111 #define shutdown_none disable_none
112 #define end_none enable_none
114 struct hw_interrupt_type no_irq_type
= {
124 volatile unsigned long irq_err_count
;
127 * Generic, controller-independent functions:
130 int get_irq_list(char *buf
)
133 struct irqaction
* action
;
136 p
+= sprintf(p
, " ");
137 for (j
=0; j
<smp_num_cpus
; j
++)
138 p
+= sprintf(p
, "CPU%d ",j
);
141 for (i
= 0 ; i
< NR_IRQS
; i
++) {
142 action
= irq_desc
[i
].action
;
145 p
+= sprintf(p
, "%3d: ",i
);
147 p
+= sprintf(p
, "%10u ", kstat_irqs(i
));
149 for (j
= 0; j
< smp_num_cpus
; j
++)
150 p
+= sprintf(p
, "%10u ",
151 kstat
.irqs
[cpu_logical_map(j
)][i
]);
153 p
+= sprintf(p
, " %14s", irq_desc
[i
].handler
->typename
);
154 p
+= sprintf(p
, " %s", action
->name
);
156 for (action
=action
->next
; action
; action
= action
->next
)
157 p
+= sprintf(p
, ", %s", action
->name
);
160 p
+= sprintf(p
, "NMI: ");
161 for (j
= 0; j
< smp_num_cpus
; j
++)
162 p
+= sprintf(p
, "%10u ",
163 nmi_count(cpu_logical_map(j
)));
164 p
+= sprintf(p
, "\n");
165 #if defined(CONFIG_SMP) && defined(__i386__)
166 p
+= sprintf(p
, "LOC: ");
167 for (j
= 0; j
< smp_num_cpus
; j
++)
168 p
+= sprintf(p
, "%10u ",
169 apic_timer_irqs
[cpu_logical_map(j
)]);
170 p
+= sprintf(p
, "\n");
172 p
+= sprintf(p
, "ERR: %10lu\n", irq_err_count
);
178 * Global interrupt locks for SMP. Allow interrupts to come in on any
179 * CPU, yet make cli/sti act globally to protect critical regions..
183 unsigned int global_irq_holder
= NO_PROC_ID
;
184 volatile unsigned int global_irq_lock
;
186 extern void show_stack(unsigned long* esp
);
188 static void show(char * str
)
191 int cpu
= smp_processor_id();
193 printk("\n%s, CPU %d:\n", str
, cpu
);
194 printk("irq: %d [",irqs_running());
195 for(i
=0;i
< smp_num_cpus
;i
++)
196 printk(" %d",local_irq_count(i
));
197 printk(" ]\nbh: %d [",spin_is_locked(&global_bh_lock
) ? 1 : 0);
198 for(i
=0;i
< smp_num_cpus
;i
++)
199 printk(" %d",local_bh_count(i
));
201 printk(" ]\nStack dumps:");
202 #if defined(__ia64__)
204 * We can't unwind the stack of another CPU without access to
205 * the registers of that CPU. And sending an IPI when we're
206 * in a potentially wedged state doesn't sound like a smart
209 #elif defined(__i386__)
210 for(i
=0;i
< smp_num_cpus
;i
++) {
214 printk("\nCPU %d:",i
);
215 esp
= init_tss
[i
].esp0
;
217 /* tss->esp0 is set to NULL in cpu_init(),
218 * it's initialized when the cpu returns to user
221 printk(" <unknown> ");
224 esp
&= ~(THREAD_SIZE
-1);
225 esp
+= sizeof(struct task_struct
);
226 show_stack((void*)esp
);
231 printk("\nCPU %d:",cpu
);
236 #define MAXCOUNT 100000000
239 * I had a lockup scenario where a tight loop doing
240 * spin_unlock()/spin_lock() on CPU#1 was racing with
241 * spin_lock() on CPU#0. CPU#0 should have noticed spin_unlock(), but
242 * apparently the spin_unlock() information did not make it
243 * through to CPU#0 ... nasty, is this by design, do we have to limit
244 * 'memory update oscillation frequency' artificially like here?
246 * Such 'high frequency update' races can be avoided by careful design, but
247 * some of our major constructs like spinlocks use similar techniques,
248 * it would be nice to clarify this issue. Set this define to 0 if you
249 * want to check whether your system freezes. I suspect the delay done
250 * by SYNC_OTHER_CORES() is in correlation with 'snooping latency', but
251 * i thought that such things are guaranteed by design, since we use
254 #define SUSPECTED_CPU_OR_CHIPSET_BUG_WORKAROUND 0
256 #if SUSPECTED_CPU_OR_CHIPSET_BUG_WORKAROUND
257 # define SYNC_OTHER_CORES(x) udelay(x+1)
260 * We have to allow irqs to arrive between __sti and __cli
263 # define SYNC_OTHER_CORES(x) __asm__ __volatile__ ("nop 0")
265 # define SYNC_OTHER_CORES(x) __asm__ __volatile__ ("nop")
269 static inline void wait_on_irq(int cpu
)
271 int count
= MAXCOUNT
;
276 * Wait until all interrupts are gone. Wait
277 * for bottom half handlers unless we're
278 * already executing in one..
281 if (local_bh_count(cpu
) || !spin_is_locked(&global_bh_lock
))
284 /* Duh, we have to loop. Release the lock to avoid deadlocks */
285 clear_bit(0,&global_irq_lock
);
293 SYNC_OTHER_CORES(cpu
);
299 if (!local_bh_count(cpu
) && spin_is_locked(&global_bh_lock
))
301 if (!test_and_set_bit(0,&global_irq_lock
))
308 * This is called when we want to synchronize with
309 * interrupts. We may for example tell a device to
310 * stop sending interrupts: but to make sure there
311 * are no interrupts that are executing on another
312 * CPU we need to call this function.
314 void synchronize_irq(void)
316 if (irqs_running()) {
317 /* Stupid approach */
323 static inline void get_irqlock(int cpu
)
325 if (test_and_set_bit(0,&global_irq_lock
)) {
326 /* do we already hold the lock? */
327 if (cpu
== global_irq_holder
)
329 /* Uhhuh.. Somebody else got it. Wait.. */
332 } while (test_bit(0,&global_irq_lock
));
333 } while (test_and_set_bit(0,&global_irq_lock
));
336 * We also to make sure that nobody else is running
337 * in an interrupt context.
344 global_irq_holder
= cpu
;
347 #define EFLAGS_IF_SHIFT 9
350 * A global "cli()" while in an interrupt context
351 * turns into just a local cli(). Interrupts
352 * should use spinlocks for the (very unlikely)
353 * case that they ever want to protect against
356 * If we already have local interrupts disabled,
357 * this will not turn a local disable into a
358 * global one (problems with spinlocks: this makes
359 * save_flags+cli+sti usable inside a spinlock).
361 void __global_cli(void)
367 if (flags
& IA64_PSR_I
) {
368 int cpu
= smp_processor_id();
370 if (!local_irq_count(cpu
))
375 if (flags
& (1 << EFLAGS_IF_SHIFT
)) {
376 int cpu
= smp_processor_id();
378 if (!local_irq_count(cpu
))
384 void __global_sti(void)
386 int cpu
= smp_processor_id();
388 if (!local_irq_count(cpu
))
389 release_irqlock(cpu
);
394 * SMP flags value to restore to:
400 unsigned long __global_save_flags(void)
405 int cpu
= smp_processor_id();
409 local_enabled
= (flags
& IA64_PSR_I
) != 0;
411 local_enabled
= (flags
>> EFLAGS_IF_SHIFT
) & 1;
413 /* default to local */
414 retval
= 2 + local_enabled
;
416 /* check for global flags if we're not in an interrupt */
417 if (!local_irq_count(cpu
)) {
420 if (global_irq_holder
== cpu
)
426 void __global_restore_flags(unsigned long flags
)
442 printk("global_restore_flags: %08lx (%08lx)\n",
443 flags
, (&flags
)[-1]);
450 * This should really return information about whether
451 * we should do bottom half handling etc. Right now we
452 * end up _always_ checking the bottom half, which is a
453 * waste of time and is not what some drivers would
456 int handle_IRQ_event(unsigned int irq
, struct pt_regs
* regs
, struct irqaction
* action
)
459 int cpu
= smp_processor_id();
463 status
= 1; /* Force the "do bottom halves" bit */
465 if (!(action
->flags
& SA_INTERRUPT
))
469 status
|= action
->flags
;
470 action
->handler(irq
, action
->dev_id
, regs
);
471 action
= action
->next
;
473 if (status
& SA_SAMPLE_RANDOM
)
474 add_interrupt_randomness(irq
);
483 * Generic enable/disable code: this just calls
484 * down into the PIC-specific version for the actual
485 * hardware disable after having gotten the irq
488 void inline disable_irq_nosync(unsigned int irq
)
490 irq_desc_t
*desc
= irq_desc
+ irq
;
493 spin_lock_irqsave(&desc
->lock
, flags
);
494 if (!desc
->depth
++) {
495 desc
->status
|= IRQ_DISABLED
;
496 desc
->handler
->disable(irq
);
498 spin_unlock_irqrestore(&desc
->lock
, flags
);
502 * Synchronous version of the above, making sure the IRQ is
503 * no longer running on any other IRQ..
505 void disable_irq(unsigned int irq
)
507 disable_irq_nosync(irq
);
510 if (!local_irq_count(smp_processor_id())) {
513 } while (irq_desc
[irq
].status
& IRQ_INPROGRESS
);
518 void enable_irq(unsigned int irq
)
520 irq_desc_t
*desc
= irq_desc
+ irq
;
523 spin_lock_irqsave(&desc
->lock
, flags
);
524 switch (desc
->depth
) {
526 unsigned int status
= desc
->status
& ~IRQ_DISABLED
;
527 desc
->status
= status
;
528 if ((status
& (IRQ_PENDING
| IRQ_REPLAY
)) == IRQ_PENDING
) {
529 desc
->status
= status
| IRQ_REPLAY
;
530 hw_resend_irq(desc
->handler
,irq
);
532 desc
->handler
->enable(irq
);
539 printk("enable_irq() unbalanced from %p\n",
540 __builtin_return_address(0));
542 spin_unlock_irqrestore(&desc
->lock
, flags
);
546 * do_IRQ handles all normal device IRQ's (the special
547 * SMP cross-CPU interrupts have their own specific
550 unsigned int do_IRQ(unsigned long irq
, struct pt_regs
*regs
)
553 * We ack quickly, we don't want the irq controller
554 * thinking we're snobs just because some other CPU has
555 * disabled global interrupts (we have already done the
556 * INT_ACK cycles, it's too late to try to pretend to the
557 * controller that we aren't taking the interrupt).
559 * 0 return value means that this irq is already being
560 * handled by some other CPU. (or is disabled)
562 int cpu
= smp_processor_id();
563 irq_desc_t
*desc
= irq_desc
+ irq
;
564 struct irqaction
* action
;
567 kstat
.irqs
[cpu
][irq
]++;
568 spin_lock(&desc
->lock
);
569 desc
->handler
->ack(irq
);
571 REPLAY is when Linux resends an IRQ that was dropped earlier
572 WAITING is used by probe to mark irqs that are being tested
574 status
= desc
->status
& ~(IRQ_REPLAY
| IRQ_WAITING
);
575 status
|= IRQ_PENDING
; /* we _want_ to handle it */
578 * If the IRQ is disabled for whatever reason, we cannot
579 * use the action we have.
582 if (!(status
& (IRQ_DISABLED
| IRQ_INPROGRESS
))) {
583 action
= desc
->action
;
584 status
&= ~IRQ_PENDING
; /* we commit to handling */
585 if (!(status
& IRQ_PER_CPU
))
586 status
|= IRQ_INPROGRESS
; /* we are handling it */
588 desc
->status
= status
;
591 * If there is no IRQ handler or it was disabled, exit early.
592 * Since we set PENDING, if another processor is handling
593 * a different instance of this same irq, the other processor
594 * will take care of it.
600 * Edge triggered interrupts need to remember
602 * This applies to any hw interrupts that allow a second
603 * instance of the same irq to arrive while we are in do_IRQ
604 * or in the handler. But the code here only handles the _second_
605 * instance of the irq, not the third or fourth. So it is mostly
606 * useful for irq hardware that does not mask cleanly in an
610 spin_unlock(&desc
->lock
);
611 handle_IRQ_event(irq
, regs
, action
);
612 spin_lock(&desc
->lock
);
614 if (!(desc
->status
& IRQ_PENDING
))
616 desc
->status
&= ~IRQ_PENDING
;
618 desc
->status
&= ~IRQ_INPROGRESS
;
621 * The ->end() handler has to deal with interrupts which got
622 * disabled while the handler was running.
624 desc
->handler
->end(irq
);
625 spin_unlock(&desc
->lock
);
630 int request_irq(unsigned int irq
,
631 void (*handler
)(int, void *, struct pt_regs
*),
632 unsigned long irqflags
,
633 const char * devname
,
637 struct irqaction
* action
;
641 * Sanity-check: shared interrupts should REALLY pass in
642 * a real dev-ID, otherwise we'll have trouble later trying
643 * to figure out which interrupt is which (messes up the
644 * interrupt freeing logic etc).
646 if (irqflags
& SA_SHIRQ
) {
648 printk("Bad boy: %s (at 0x%x) called us without a dev_id!\n", devname
, (&irq
)[-1]);
657 action
= (struct irqaction
*)
658 kmalloc(sizeof(struct irqaction
), GFP_KERNEL
);
662 action
->handler
= handler
;
663 action
->flags
= irqflags
;
665 action
->name
= devname
;
667 action
->dev_id
= dev_id
;
669 retval
= setup_irq(irq
, action
);
675 void free_irq(unsigned int irq
, void *dev_id
)
678 struct irqaction
**p
;
684 desc
= irq_desc
+ irq
;
685 spin_lock_irqsave(&desc
->lock
,flags
);
688 struct irqaction
* action
= *p
;
690 struct irqaction
**pp
= p
;
692 if (action
->dev_id
!= dev_id
)
695 /* Found it - now remove it from the list of entries */
698 desc
->status
|= IRQ_DISABLED
;
699 desc
->handler
->shutdown(irq
);
701 spin_unlock_irqrestore(&desc
->lock
,flags
);
704 /* Wait to make sure it's not being used on another CPU */
705 while (desc
->status
& IRQ_INPROGRESS
)
711 printk("Trying to free free IRQ%d\n",irq
);
712 spin_unlock_irqrestore(&desc
->lock
,flags
);
718 * IRQ autodetection code..
720 * This depends on the fact that any interrupt that
721 * comes in on to an unassigned handler will get stuck
722 * with "IRQ_WAITING" cleared and the interrupt
725 unsigned long probe_irq_on(void)
733 * something may have generated an irq long ago and we want to
734 * flush such a longstanding irq before considering it as spurious.
736 for (i
= NR_IRQS
-1; i
> 0; i
--) {
739 spin_lock_irq(&desc
->lock
);
740 if (!irq_desc
[i
].action
)
741 irq_desc
[i
].handler
->startup(i
);
742 spin_unlock_irq(&desc
->lock
);
745 /* Wait for longstanding interrupts to trigger. */
746 for (delay
= jiffies
+ HZ
/50; time_after(delay
, jiffies
); )
747 /* about 20ms delay */ synchronize_irq();
750 * enable any unassigned irqs
751 * (we must startup again here because if a longstanding irq
752 * happened in the previous stage, it may have masked itself)
754 for (i
= NR_IRQS
-1; i
> 0; i
--) {
757 spin_lock_irq(&desc
->lock
);
759 desc
->status
|= IRQ_AUTODETECT
| IRQ_WAITING
;
760 if (desc
->handler
->startup(i
))
761 desc
->status
|= IRQ_PENDING
;
763 spin_unlock_irq(&desc
->lock
);
767 * Wait for spurious interrupts to trigger
769 for (delay
= jiffies
+ HZ
/10; time_after(delay
, jiffies
); )
770 /* about 100ms delay */ synchronize_irq();
773 * Now filter out any obviously spurious interrupts
776 for (i
= 0; i
< NR_IRQS
; i
++) {
777 irq_desc_t
*desc
= irq_desc
+ i
;
780 spin_lock_irq(&desc
->lock
);
781 status
= desc
->status
;
783 if (status
& IRQ_AUTODETECT
) {
784 /* It triggered already - consider it spurious. */
785 if (!(status
& IRQ_WAITING
)) {
786 desc
->status
= status
& ~IRQ_AUTODETECT
;
787 desc
->handler
->shutdown(i
);
792 spin_unlock_irq(&desc
->lock
);
799 * Return a mask of triggered interrupts (this
800 * can handle only legacy ISA interrupts).
802 unsigned int probe_irq_mask(unsigned long val
)
808 for (i
= 0; i
< 16; i
++) {
809 irq_desc_t
*desc
= irq_desc
+ i
;
812 spin_lock_irq(&desc
->lock
);
813 status
= desc
->status
;
815 if (status
& IRQ_AUTODETECT
) {
816 if (!(status
& IRQ_WAITING
))
819 desc
->status
= status
& ~IRQ_AUTODETECT
;
820 desc
->handler
->shutdown(i
);
822 spin_unlock_irq(&desc
->lock
);
829 * Return the one interrupt that triggered (this can
830 * handle any interrupt source)
832 int probe_irq_off(unsigned long val
)
834 int i
, irq_found
, nr_irqs
;
838 for (i
= 0; i
< NR_IRQS
; i
++) {
839 irq_desc_t
*desc
= irq_desc
+ i
;
842 spin_lock_irq(&desc
->lock
);
843 status
= desc
->status
;
845 if (status
& IRQ_AUTODETECT
) {
846 if (!(status
& IRQ_WAITING
)) {
851 desc
->status
= status
& ~IRQ_AUTODETECT
;
852 desc
->handler
->shutdown(i
);
854 spin_unlock_irq(&desc
->lock
);
858 irq_found
= -irq_found
;
862 /* this was setup_x86_irq but it seems pretty generic */
863 int setup_irq(unsigned int irq
, struct irqaction
* new)
867 struct irqaction
*old
, **p
;
868 irq_desc_t
*desc
= irq_desc
+ irq
;
871 * Some drivers like serial.c use request_irq() heavily,
872 * so we have to be careful not to interfere with a
875 if (new->flags
& SA_SAMPLE_RANDOM
) {
877 * This function might sleep, we want to call it first,
878 * outside of the atomic block.
879 * Yes, this might clear the entropy pool if the wrong
880 * driver is attempted to be loaded, without actually
881 * installing a new handler, but is this really a problem,
882 * only the sysadmin is able to do this.
884 rand_initialize_irq(irq
);
888 * The following block of code has to be executed atomically
890 spin_lock_irqsave(&desc
->lock
,flags
);
892 if ((old
= *p
) != NULL
) {
893 /* Can't share interrupts unless both agree to */
894 if (!(old
->flags
& new->flags
& SA_SHIRQ
)) {
895 spin_unlock_irqrestore(&desc
->lock
,flags
);
899 /* add new interrupt at end of irq queue */
911 desc
->status
&= ~IRQ_DISABLED
;
912 desc
->handler
->startup(irq
);
914 spin_unlock_irqrestore(&desc
->lock
,flags
);
916 register_irq_proc(irq
);
920 static struct proc_dir_entry
* root_irq_dir
;
921 static struct proc_dir_entry
* irq_dir
[NR_IRQS
];
922 static struct proc_dir_entry
* smp_affinity_entry
[NR_IRQS
];
924 static unsigned long irq_affinity
[NR_IRQS
] = { [0 ... NR_IRQS
-1] = ~0UL };
928 static int irq_affinity_read_proc (char *page
, char **start
, off_t off
,
929 int count
, int *eof
, void *data
)
931 if (count
< HEX_DIGITS
+1)
933 return sprintf (page
, "%08lx\n", irq_affinity
[(long)data
]);
936 static unsigned int parse_hex_value (const char *buffer
,
937 unsigned long count
, unsigned long *ret
)
939 unsigned char hexnum
[HEX_DIGITS
];
945 if (count
> HEX_DIGITS
)
947 if (copy_from_user(hexnum
, buffer
, count
))
951 * Parse the first 8 characters as a hex string, any non-hex char
952 * is end-of-string. '00e1', 'e1', '00E1', 'E1' are all the same.
956 for (i
= 0; i
< count
; i
++) {
957 unsigned int c
= hexnum
[i
];
960 case '0' ... '9': c
-= '0'; break;
961 case 'a' ... 'f': c
-= 'a'-10; break;
962 case 'A' ... 'F': c
-= 'A'-10; break;
966 value
= (value
<< 4) | c
;
973 static int irq_affinity_write_proc (struct file
*file
, const char *buffer
,
974 unsigned long count
, void *data
)
976 int irq
= (long) data
, full_count
= count
, err
;
977 unsigned long new_value
;
979 if (!irq_desc
[irq
].handler
->set_affinity
)
982 err
= parse_hex_value(buffer
, count
, &new_value
);
986 * Do not allow disabling IRQs completely - it's a too easy
987 * way to make the system unusable accidentally :-) At least
988 * one online CPU still has to be targeted.
990 if (!(new_value
& cpu_online_map
))
994 irq_affinity
[irq
] = new_value
;
995 irq_desc
[irq
].handler
->set_affinity(irq
, new_value
);
1000 static int prof_cpu_mask_read_proc (char *page
, char **start
, off_t off
,
1001 int count
, int *eof
, void *data
)
1003 unsigned long *mask
= (unsigned long *) data
;
1004 if (count
< HEX_DIGITS
+1)
1006 return sprintf (page
, "%08lx\n", *mask
);
1009 static int prof_cpu_mask_write_proc (struct file
*file
, const char *buffer
,
1010 unsigned long count
, void *data
)
1012 unsigned long *mask
= (unsigned long *) data
, full_count
= count
, err
;
1013 unsigned long new_value
;
1015 err
= parse_hex_value(buffer
, count
, &new_value
);
1023 #define MAX_NAMELEN 10
1025 static void register_irq_proc (unsigned int irq
)
1027 struct proc_dir_entry
*entry
;
1028 char name
[MAX_NAMELEN
];
1030 if (!root_irq_dir
|| (irq_desc
[irq
].handler
== &no_irq_type
))
1033 memset(name
, 0, MAX_NAMELEN
);
1034 sprintf(name
, "%d", irq
);
1036 /* create /proc/irq/1234 */
1037 irq_dir
[irq
] = proc_mkdir(name
, root_irq_dir
);
1039 /* create /proc/irq/1234/smp_affinity */
1040 entry
= create_proc_entry("smp_affinity", 0600, irq_dir
[irq
]);
1043 entry
->data
= (void *)(long)irq
;
1044 entry
->read_proc
= irq_affinity_read_proc
;
1045 entry
->write_proc
= irq_affinity_write_proc
;
1047 smp_affinity_entry
[irq
] = entry
;
1050 unsigned long prof_cpu_mask
= -1;
1052 void init_irq_proc (void)
1054 struct proc_dir_entry
*entry
;
1057 /* create /proc/irq */
1058 root_irq_dir
= proc_mkdir("irq", 0);
1060 /* create /proc/irq/prof_cpu_mask */
1061 entry
= create_proc_entry("prof_cpu_mask", 0600, root_irq_dir
);
1064 entry
->data
= (void *)&prof_cpu_mask
;
1065 entry
->read_proc
= prof_cpu_mask_read_proc
;
1066 entry
->write_proc
= prof_cpu_mask_write_proc
;
1069 * Create entries for all existing IRQs.
1071 for (i
= 0; i
< NR_IRQS
; i
++) {
1072 if (irq_desc
[i
].handler
== &no_irq_type
)
1074 register_irq_proc(i
);