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[PATCH] Alpha: convert to generic irq framework (alpha part) 

Kconfig tweaks and tons of deletions.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ivan Kokshaysky 2006-01-06 00:12:22 -08:00 committed by Linus Torvalds
parent eee45269b0
commit 0595bf3bca
4 changed files with 24 additions and 622 deletions
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13
arch/alpha/Kconfig
View File

@ -40,6 +40,19 @@ config GENERIC_IOMAP
bool
default n
config GENERIC_HARDIRQS
bool
default y
config GENERIC_IRQ_PROBE
bool
default y
config AUTO_IRQ_AFFINITY
bool
depends on SMP
default y
source "init/Kconfig"

1
arch/alpha/kernel/alpha_ksyms.c
View File

@ -175,7 +175,6 @@ EXPORT_SYMBOL(up);
*/
#ifdef CONFIG_SMP
EXPORT_SYMBOL(synchronize_irq);
EXPORT_SYMBOL(flush_tlb_mm);
EXPORT_SYMBOL(flush_tlb_range);
EXPORT_SYMBOL(flush_tlb_page);

630
arch/alpha/kernel/irq.c
View File

@ -32,214 +32,25 @@
#include <asm/io.h>
#include <asm/uaccess.h>
/*
* Controller mappings for all interrupt sources:
*/
irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
[0 ... NR_IRQS-1] = {
.handler = &no_irq_type,
.lock = SPIN_LOCK_UNLOCKED
}
};
static void register_irq_proc(unsigned int irq);
volatile unsigned long irq_err_count;
/*
* Special irq handlers.
*/
irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
{
return IRQ_NONE;
}
/*
* Generic no controller code
*/
static void no_irq_enable_disable(unsigned int irq) { }
static unsigned int no_irq_startup(unsigned int irq) { return 0; }
static void
no_irq_ack(unsigned int irq)
void ack_bad_irq(unsigned int irq)
{
irq_err_count++;
printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
}
struct hw_interrupt_type no_irq_type = {
.typename = "none",
.startup = no_irq_startup,
.shutdown = no_irq_enable_disable,
.enable = no_irq_enable_disable,
.disable = no_irq_enable_disable,
.ack = no_irq_ack,
.end = no_irq_enable_disable,
};
int
handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
struct irqaction *action)
{
int status = 1; /* Force the "do bottom halves" bit */
int ret;
do {
if (!(action->flags & SA_INTERRUPT))
local_irq_enable();
else
local_irq_disable();
ret = action->handler(irq, action->dev_id, regs);
if (ret == IRQ_HANDLED)
status |= action->flags;
action = action->next;
} while (action);
if (status & SA_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
local_irq_disable();
return status;
}
/*
* Generic enable/disable code: this just calls
* down into the PIC-specific version for the actual
* hardware disable after having gotten the irq
* controller lock.
*/
void inline
disable_irq_nosync(unsigned int irq)
{
irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
if (!desc->depth++) {
desc->status |= IRQ_DISABLED;
desc->handler->disable(irq);
}
spin_unlock_irqrestore(&desc->lock, flags);
}
/*
* Synchronous version of the above, making sure the IRQ is
* no longer running on any other IRQ..
*/
void
disable_irq(unsigned int irq)
{
disable_irq_nosync(irq);
synchronize_irq(irq);
}
void
enable_irq(unsigned int irq)
{
irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
switch (desc->depth) {
case 1: {
unsigned int status = desc->status & ~IRQ_DISABLED;
desc->status = status;
if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
desc->status = status | IRQ_REPLAY;
hw_resend_irq(desc->handler,irq);
}
desc->handler->enable(irq);
/* fall-through */
}
default:
desc->depth--;
break;
case 0:
printk(KERN_ERR "enable_irq() unbalanced from %p\n",
__builtin_return_address(0));
}
spin_unlock_irqrestore(&desc->lock, flags);
}
int
setup_irq(unsigned int irq, struct irqaction * new)
{
int shared = 0;
struct irqaction *old, **p;
unsigned long flags;
irq_desc_t *desc = irq_desc + irq;
if (desc->handler == &no_irq_type)
return -ENOSYS;
/*
* Some drivers like serial.c use request_irq() heavily,
* so we have to be careful not to interfere with a
* running system.
*/
if (new->flags & SA_SAMPLE_RANDOM) {
/*
* This function might sleep, we want to call it first,
* outside of the atomic block.
* Yes, this might clear the entropy pool if the wrong
* driver is attempted to be loaded, without actually
* installing a new handler, but is this really a problem,
* only the sysadmin is able to do this.
*/
rand_initialize_irq(irq);
}
/*
* The following block of code has to be executed atomically
*/
spin_lock_irqsave(&desc->lock,flags);
p = &desc->action;
if ((old = *p) != NULL) {
/* Can't share interrupts unless both agree to */
if (!(old->flags & new->flags & SA_SHIRQ)) {
spin_unlock_irqrestore(&desc->lock,flags);
return -EBUSY;
}
/* add new interrupt at end of irq queue */
do {
p = &old->next;
old = *p;
} while (old);
shared = 1;
}
*p = new;
if (!shared) {
desc->depth = 0;
desc->status &=
~(IRQ_DISABLED|IRQ_AUTODETECT|IRQ_WAITING|IRQ_INPROGRESS);
desc->handler->startup(irq);
}
spin_unlock_irqrestore(&desc->lock,flags);
return 0;
}
static struct proc_dir_entry * root_irq_dir;
static struct proc_dir_entry * irq_dir[NR_IRQS];
#ifdef CONFIG_SMP
static struct proc_dir_entry * smp_affinity_entry[NR_IRQS];
static char irq_user_affinity[NR_IRQS];
static cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
static void
select_smp_affinity(int irq)
int
select_smp_affinity(unsigned int irq)
{
static int last_cpu;
int cpu = last_cpu + 1;
if (! irq_desc[irq].handler->set_affinity || irq_user_affinity[irq])
return;
if (!irq_desc[irq].handler->set_affinity || irq_user_affinity[irq])
return 1;
while (!cpu_possible(cpu))
cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
@ -247,208 +58,10 @@ select_smp_affinity(int irq)
irq_affinity[irq] = cpumask_of_cpu(cpu);
irq_desc[irq].handler->set_affinity(irq, cpumask_of_cpu(cpu));
return 0;
}
static int
irq_affinity_read_proc (char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len = cpumask_scnprintf(page, count, irq_affinity[(long)data]);
if (count - len < 2)
return -EINVAL;
len += sprintf(page + len, "\n");
return len;
}
static int
irq_affinity_write_proc(struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
int irq = (long) data, full_count = count, err;
cpumask_t new_value;
if (!irq_desc[irq].handler->set_affinity)
return -EIO;
err = cpumask_parse(buffer, count, new_value);
/* The special value 0 means release control of the
affinity to kernel. */
cpus_and(new_value, new_value, cpu_online_map);
if (cpus_empty(new_value)) {
irq_user_affinity[irq] = 0;
select_smp_affinity(irq);
}
/* Do not allow disabling IRQs completely - it's a too easy
way to make the system unusable accidentally :-) At least
one online CPU still has to be targeted. */
else {
irq_affinity[irq] = new_value;
irq_user_affinity[irq] = 1;
irq_desc[irq].handler->set_affinity(irq, new_value);
}
return full_count;
}
#endif /* CONFIG_SMP */
#define MAX_NAMELEN 10
static void
register_irq_proc (unsigned int irq)
{
char name [MAX_NAMELEN];
if (!root_irq_dir || (irq_desc[irq].handler == &no_irq_type) ||
irq_dir[irq])
return;
memset(name, 0, MAX_NAMELEN);
sprintf(name, "%d", irq);
/* create /proc/irq/1234 */
irq_dir[irq] = proc_mkdir(name, root_irq_dir);
#ifdef CONFIG_SMP
if (irq_desc[irq].handler->set_affinity) {
struct proc_dir_entry *entry;
/* create /proc/irq/1234/smp_affinity */
entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
if (entry) {
entry->nlink = 1;
entry->data = (void *)(long)irq;
entry->read_proc = irq_affinity_read_proc;
entry->write_proc = irq_affinity_write_proc;
}
smp_affinity_entry[irq] = entry;
}
#endif
}
void
init_irq_proc (void)
{
int i;
/* create /proc/irq */
root_irq_dir = proc_mkdir("irq", NULL);
#ifdef CONFIG_SMP
/* create /proc/irq/prof_cpu_mask */
create_prof_cpu_mask(root_irq_dir);
#endif
/*
* Create entries for all existing IRQs.
*/
for (i = 0; i < ACTUAL_NR_IRQS; i++) {
if (irq_desc[i].handler == &no_irq_type)
continue;
register_irq_proc(i);
}
}
int
request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags, const char * devname, void *dev_id)
{
int retval;
struct irqaction * action;
if (irq >= ACTUAL_NR_IRQS)
return -EINVAL;
if (!handler)
return -EINVAL;
#if 1
/*
* Sanity-check: shared interrupts should REALLY pass in
* a real dev-ID, otherwise we'll have trouble later trying
* to figure out which interrupt is which (messes up the
* interrupt freeing logic etc).
*/
if ((irqflags & SA_SHIRQ) && !dev_id) {
printk(KERN_ERR
"Bad boy: %s (at %p) called us without a dev_id!\n",
devname, __builtin_return_address(0));
}
#endif
action = (struct irqaction *)
kmalloc(sizeof(struct irqaction), GFP_KERNEL);
if (!action)
return -ENOMEM;
action->handler = handler;
action->flags = irqflags;
cpus_clear(action->mask);
action->name = devname;
action->next = NULL;
action->dev_id = dev_id;
#ifdef CONFIG_SMP
select_smp_affinity(irq);
#endif
retval = setup_irq(irq, action);
if (retval)
kfree(action);
return retval;
}
EXPORT_SYMBOL(request_irq);
void
free_irq(unsigned int irq, void *dev_id)
{
irq_desc_t *desc;
struct irqaction **p;
unsigned long flags;
if (irq >= ACTUAL_NR_IRQS) {
printk(KERN_CRIT "Trying to free IRQ%d\n", irq);
return;
}
desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock,flags);
p = &desc->action;
for (;;) {
struct irqaction * action = *p;
if (action) {
struct irqaction **pp = p;
p = &action->next;
if (action->dev_id != dev_id)
continue;
/* Found - now remove it from the list of entries. */
*pp = action->next;
if (!desc->action) {
desc->status |= IRQ_DISABLED;
desc->handler->shutdown(irq);
}
spin_unlock_irqrestore(&desc->lock,flags);
#ifdef CONFIG_SMP
/* Wait to make sure it's not being used on
another CPU. */
while (desc->status & IRQ_INPROGRESS)
barrier();
#endif
kfree(action);
return;
}
printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
spin_unlock_irqrestore(&desc->lock,flags);
return;
}
}
EXPORT_SYMBOL(free_irq);
int
show_interrupts(struct seq_file *p, void *v)
{
@ -531,10 +144,6 @@ handle_irq(int irq, struct pt_regs * regs)
* 0 return value means that this irq is already being
* handled by some other CPU. (or is disabled)
*/
int cpu = smp_processor_id();
irq_desc_t *desc = irq_desc + irq;
struct irqaction * action;
unsigned int status;
static unsigned int illegal_count=0;
if ((unsigned) irq > ACTUAL_NR_IRQS && illegal_count < MAX_ILLEGAL_IRQS ) {
@ -546,229 +155,8 @@ handle_irq(int irq, struct pt_regs * regs)
}
irq_enter();
kstat_cpu(cpu).irqs[irq]++;
spin_lock_irq(&desc->lock); /* mask also the higher prio events */
desc->handler->ack(irq);
/*
* REPLAY is when Linux resends an IRQ that was dropped earlier.
* WAITING is used by probe to mark irqs that are being tested.
*/
status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
status |= IRQ_PENDING; /* we _want_ to handle it */
/*
* If the IRQ is disabled for whatever reason, we cannot
* use the action we have.
*/
action = NULL;
if (!(status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
action = desc->action;
status &= ~IRQ_PENDING; /* we commit to handling */
status |= IRQ_INPROGRESS; /* we are handling it */
}
desc->status = status;
/*
* If there is no IRQ handler or it was disabled, exit early.
* Since we set PENDING, if another processor is handling
* a different instance of this same irq, the other processor
* will take care of it.
*/
if (!action)
goto out;
/*
* Edge triggered interrupts need to remember pending events.
* This applies to any hw interrupts that allow a second
* instance of the same irq to arrive while we are in handle_irq
* or in the handler. But the code here only handles the _second_
* instance of the irq, not the third or fourth. So it is mostly
* useful for irq hardware that does not mask cleanly in an
* SMP environment.
*/
for (;;) {
spin_unlock(&desc->lock);
handle_IRQ_event(irq, regs, action);
spin_lock(&desc->lock);
if (!(desc->status & IRQ_PENDING)
|| (desc->status & IRQ_LEVEL))
break;
desc->status &= ~IRQ_PENDING;
}
desc->status &= ~IRQ_INPROGRESS;
out:
/*
* The ->end() handler has to deal with interrupts which got
* disabled while the handler was running.
*/
desc->handler->end(irq);
spin_unlock(&desc->lock);
local_irq_disable();
__do_IRQ(irq, regs);
local_irq_enable();
irq_exit();
}
/*
* IRQ autodetection code..
*
* This depends on the fact that any interrupt that
* comes in on to an unassigned handler will get stuck
* with "IRQ_WAITING" cleared and the interrupt
* disabled.
*/
unsigned long
probe_irq_on(void)
{
int i;
irq_desc_t *desc;
unsigned long delay;
unsigned long val;
/* Something may have generated an irq long ago and we want to
flush such a longstanding irq before considering it as spurious. */
for (i = NR_IRQS-1; i >= 0; i--) {
desc = irq_desc + i;
spin_lock_irq(&desc->lock);
if (!irq_desc[i].action)
irq_desc[i].handler->startup(i);
spin_unlock_irq(&desc->lock);
}
/* Wait for longstanding interrupts to trigger. */
for (delay = jiffies + HZ/50; time_after(delay, jiffies); )
/* about 20ms delay */ barrier();
/* enable any unassigned irqs (we must startup again here because
if a longstanding irq happened in the previous stage, it may have
masked itself) first, enable any unassigned irqs. */
for (i = NR_IRQS-1; i >= 0; i--) {
desc = irq_desc + i;
spin_lock_irq(&desc->lock);
if (!desc->action) {
desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
if (desc->handler->startup(i))
desc->status |= IRQ_PENDING;
}
spin_unlock_irq(&desc->lock);
}
/*
* Wait for spurious interrupts to trigger
*/
for (delay = jiffies + HZ/10; time_after(delay, jiffies); )
/* about 100ms delay */ barrier();
/*
* Now filter out any obviously spurious interrupts
*/
val = 0;
for (i=0; i<NR_IRQS; i++) {
irq_desc_t *desc = irq_desc + i;
unsigned int status;
spin_lock_irq(&desc->lock);
status = desc->status;
if (status & IRQ_AUTODETECT) {
/* It triggered already - consider it spurious. */
if (!(status & IRQ_WAITING)) {
desc->status = status & ~IRQ_AUTODETECT;
desc->handler->shutdown(i);
} else
if (i < 32)
val |= 1 << i;
}
spin_unlock_irq(&desc->lock);
}
return val;
}
EXPORT_SYMBOL(probe_irq_on);
/*
* Return a mask of triggered interrupts (this
* can handle only legacy ISA interrupts).
*/
unsigned int
probe_irq_mask(unsigned long val)
{
int i;
unsigned int mask;
mask = 0;
for (i = 0; i < NR_IRQS; i++) {
irq_desc_t *desc = irq_desc + i;
unsigned int status;
spin_lock_irq(&desc->lock);
status = desc->status;
if (status & IRQ_AUTODETECT) {
/* We only react to ISA interrupts */
if (!(status & IRQ_WAITING)) {
if (i < 16)
mask |= 1 << i;
}
desc->status = status & ~IRQ_AUTODETECT;
desc->handler->shutdown(i);
}
spin_unlock_irq(&desc->lock);
}
return mask & val;
}
/*
* Get the result of the IRQ probe.. A negative result means that
* we have several candidates (but we return the lowest-numbered
* one).
*/
int
probe_irq_off(unsigned long val)
{
int i, irq_found, nr_irqs;
nr_irqs = 0;
irq_found = 0;
for (i=0; i<NR_IRQS; i++) {
irq_desc_t *desc = irq_desc + i;
unsigned int status;
spin_lock_irq(&desc->lock);
status = desc->status;
if (status & IRQ_AUTODETECT) {
if (!(status & IRQ_WAITING)) {
if (!nr_irqs)
irq_found = i;
nr_irqs++;
}
desc->status = status & ~IRQ_AUTODETECT;
desc->handler->shutdown(i);
}
spin_unlock_irq(&desc->lock);
}
if (nr_irqs > 1)
irq_found = -irq_found;
return irq_found;
}
EXPORT_SYMBOL(probe_irq_off);
#ifdef CONFIG_SMP
void synchronize_irq(unsigned int irq)
{
/* is there anything to synchronize with? */
if (!irq_desc[irq].action)
return;
while (irq_desc[irq].status & IRQ_INPROGRESS)
barrier();
}
#endif

2
include/asm-alpha/hardirq.h
View File

@ -13,6 +13,8 @@ typedef struct {
#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
void ack_bad_irq(unsigned int irq);
#define HARDIRQ_BITS 12
/*