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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
Linus Torvalds
parent
eee45269b0
commit
0595bf3bca
@ -40,6 +40,19 @@ config GENERIC_IOMAP
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bool
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default n
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config GENERIC_HARDIRQS
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bool
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default y
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config GENERIC_IRQ_PROBE
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bool
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default y
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config AUTO_IRQ_AFFINITY
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bool
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depends on SMP
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default y
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source "init/Kconfig"
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@ -175,7 +175,6 @@ EXPORT_SYMBOL(up);
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*/
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#ifdef CONFIG_SMP
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EXPORT_SYMBOL(synchronize_irq);
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EXPORT_SYMBOL(flush_tlb_mm);
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EXPORT_SYMBOL(flush_tlb_range);
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EXPORT_SYMBOL(flush_tlb_page);
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@ -32,214 +32,25 @@
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#include <asm/io.h>
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#include <asm/uaccess.h>
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/*
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* Controller mappings for all interrupt sources:
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*/
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irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
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[0 ... NR_IRQS-1] = {
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.handler = &no_irq_type,
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.lock = SPIN_LOCK_UNLOCKED
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}
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};
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static void register_irq_proc(unsigned int irq);
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volatile unsigned long irq_err_count;
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/*
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* Special irq handlers.
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*/
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irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
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{
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return IRQ_NONE;
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}
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/*
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* Generic no controller code
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*/
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static void no_irq_enable_disable(unsigned int irq) { }
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static unsigned int no_irq_startup(unsigned int irq) { return 0; }
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static void
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no_irq_ack(unsigned int irq)
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void ack_bad_irq(unsigned int irq)
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{
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irq_err_count++;
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printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
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}
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struct hw_interrupt_type no_irq_type = {
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.typename = "none",
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.startup = no_irq_startup,
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.shutdown = no_irq_enable_disable,
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.enable = no_irq_enable_disable,
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.disable = no_irq_enable_disable,
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.ack = no_irq_ack,
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.end = no_irq_enable_disable,
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};
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int
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handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
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struct irqaction *action)
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{
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int status = 1; /* Force the "do bottom halves" bit */
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int ret;
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do {
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if (!(action->flags & SA_INTERRUPT))
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local_irq_enable();
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else
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local_irq_disable();
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ret = action->handler(irq, action->dev_id, regs);
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if (ret == IRQ_HANDLED)
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status |= action->flags;
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action = action->next;
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} while (action);
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if (status & SA_SAMPLE_RANDOM)
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add_interrupt_randomness(irq);
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local_irq_disable();
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return status;
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}
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/*
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* Generic enable/disable code: this just calls
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* down into the PIC-specific version for the actual
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* hardware disable after having gotten the irq
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* controller lock.
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*/
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void inline
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disable_irq_nosync(unsigned int irq)
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{
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irq_desc_t *desc = irq_desc + irq;
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unsigned long flags;
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spin_lock_irqsave(&desc->lock, flags);
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if (!desc->depth++) {
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desc->status |= IRQ_DISABLED;
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desc->handler->disable(irq);
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}
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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/*
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* Synchronous version of the above, making sure the IRQ is
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* no longer running on any other IRQ..
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*/
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void
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disable_irq(unsigned int irq)
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{
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disable_irq_nosync(irq);
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synchronize_irq(irq);
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}
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void
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enable_irq(unsigned int irq)
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{
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irq_desc_t *desc = irq_desc + irq;
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unsigned long flags;
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spin_lock_irqsave(&desc->lock, flags);
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switch (desc->depth) {
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case 1: {
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unsigned int status = desc->status & ~IRQ_DISABLED;
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desc->status = status;
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if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
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desc->status = status | IRQ_REPLAY;
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hw_resend_irq(desc->handler,irq);
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}
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desc->handler->enable(irq);
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/* fall-through */
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}
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default:
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desc->depth--;
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break;
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case 0:
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printk(KERN_ERR "enable_irq() unbalanced from %p\n",
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__builtin_return_address(0));
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}
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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int
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setup_irq(unsigned int irq, struct irqaction * new)
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{
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int shared = 0;
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struct irqaction *old, **p;
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unsigned long flags;
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irq_desc_t *desc = irq_desc + irq;
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if (desc->handler == &no_irq_type)
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return -ENOSYS;
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/*
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* Some drivers like serial.c use request_irq() heavily,
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* so we have to be careful not to interfere with a
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* running system.
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*/
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if (new->flags & SA_SAMPLE_RANDOM) {
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/*
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* This function might sleep, we want to call it first,
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* outside of the atomic block.
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* Yes, this might clear the entropy pool if the wrong
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* driver is attempted to be loaded, without actually
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* installing a new handler, but is this really a problem,
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* only the sysadmin is able to do this.
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*/
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rand_initialize_irq(irq);
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}
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/*
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* The following block of code has to be executed atomically
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*/
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spin_lock_irqsave(&desc->lock,flags);
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p = &desc->action;
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if ((old = *p) != NULL) {
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/* Can't share interrupts unless both agree to */
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if (!(old->flags & new->flags & SA_SHIRQ)) {
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spin_unlock_irqrestore(&desc->lock,flags);
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return -EBUSY;
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}
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/* add new interrupt at end of irq queue */
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do {
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p = &old->next;
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old = *p;
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} while (old);
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shared = 1;
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}
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*p = new;
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if (!shared) {
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desc->depth = 0;
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desc->status &=
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~(IRQ_DISABLED|IRQ_AUTODETECT|IRQ_WAITING|IRQ_INPROGRESS);
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desc->handler->startup(irq);
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}
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spin_unlock_irqrestore(&desc->lock,flags);
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return 0;
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}
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static struct proc_dir_entry * root_irq_dir;
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static struct proc_dir_entry * irq_dir[NR_IRQS];
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#ifdef CONFIG_SMP
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static struct proc_dir_entry * smp_affinity_entry[NR_IRQS];
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static char irq_user_affinity[NR_IRQS];
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static cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
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static void
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select_smp_affinity(int irq)
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int
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select_smp_affinity(unsigned int irq)
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{
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static int last_cpu;
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int cpu = last_cpu + 1;
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if (! irq_desc[irq].handler->set_affinity || irq_user_affinity[irq])
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return;
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if (!irq_desc[irq].handler->set_affinity || irq_user_affinity[irq])
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return 1;
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while (!cpu_possible(cpu))
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cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
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@ -247,208 +58,10 @@ select_smp_affinity(int irq)
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irq_affinity[irq] = cpumask_of_cpu(cpu);
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irq_desc[irq].handler->set_affinity(irq, cpumask_of_cpu(cpu));
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return 0;
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}
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static int
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irq_affinity_read_proc (char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int len = cpumask_scnprintf(page, count, irq_affinity[(long)data]);
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if (count - len < 2)
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return -EINVAL;
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len += sprintf(page + len, "\n");
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return len;
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}
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static int
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irq_affinity_write_proc(struct file *file, const char __user *buffer,
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unsigned long count, void *data)
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{
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int irq = (long) data, full_count = count, err;
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cpumask_t new_value;
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if (!irq_desc[irq].handler->set_affinity)
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return -EIO;
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err = cpumask_parse(buffer, count, new_value);
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/* The special value 0 means release control of the
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affinity to kernel. */
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cpus_and(new_value, new_value, cpu_online_map);
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if (cpus_empty(new_value)) {
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irq_user_affinity[irq] = 0;
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select_smp_affinity(irq);
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}
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/* Do not allow disabling IRQs completely - it's a too easy
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way to make the system unusable accidentally :-) At least
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one online CPU still has to be targeted. */
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else {
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irq_affinity[irq] = new_value;
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irq_user_affinity[irq] = 1;
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irq_desc[irq].handler->set_affinity(irq, new_value);
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}
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return full_count;
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}
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#endif /* CONFIG_SMP */
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#define MAX_NAMELEN 10
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static void
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register_irq_proc (unsigned int irq)
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{
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char name [MAX_NAMELEN];
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if (!root_irq_dir || (irq_desc[irq].handler == &no_irq_type) ||
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irq_dir[irq])
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return;
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memset(name, 0, MAX_NAMELEN);
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sprintf(name, "%d", irq);
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/* create /proc/irq/1234 */
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irq_dir[irq] = proc_mkdir(name, root_irq_dir);
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#ifdef CONFIG_SMP
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if (irq_desc[irq].handler->set_affinity) {
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struct proc_dir_entry *entry;
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/* create /proc/irq/1234/smp_affinity */
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entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
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if (entry) {
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entry->nlink = 1;
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entry->data = (void *)(long)irq;
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entry->read_proc = irq_affinity_read_proc;
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entry->write_proc = irq_affinity_write_proc;
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}
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smp_affinity_entry[irq] = entry;
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}
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#endif
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}
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void
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init_irq_proc (void)
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{
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int i;
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/* create /proc/irq */
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root_irq_dir = proc_mkdir("irq", NULL);
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#ifdef CONFIG_SMP
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/* create /proc/irq/prof_cpu_mask */
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create_prof_cpu_mask(root_irq_dir);
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#endif
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/*
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* Create entries for all existing IRQs.
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*/
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for (i = 0; i < ACTUAL_NR_IRQS; i++) {
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if (irq_desc[i].handler == &no_irq_type)
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continue;
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register_irq_proc(i);
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}
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}
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int
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request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long irqflags, const char * devname, void *dev_id)
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{
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int retval;
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struct irqaction * action;
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if (irq >= ACTUAL_NR_IRQS)
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return -EINVAL;
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if (!handler)
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return -EINVAL;
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#if 1
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/*
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* Sanity-check: shared interrupts should REALLY pass in
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* a real dev-ID, otherwise we'll have trouble later trying
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* to figure out which interrupt is which (messes up the
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* interrupt freeing logic etc).
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*/
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if ((irqflags & SA_SHIRQ) && !dev_id) {
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printk(KERN_ERR
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"Bad boy: %s (at %p) called us without a dev_id!\n",
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devname, __builtin_return_address(0));
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}
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#endif
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action = (struct irqaction *)
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kmalloc(sizeof(struct irqaction), GFP_KERNEL);
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if (!action)
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return -ENOMEM;
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action->handler = handler;
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action->flags = irqflags;
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cpus_clear(action->mask);
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action->name = devname;
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action->next = NULL;
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action->dev_id = dev_id;
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#ifdef CONFIG_SMP
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select_smp_affinity(irq);
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#endif
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retval = setup_irq(irq, action);
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if (retval)
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kfree(action);
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return retval;
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}
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EXPORT_SYMBOL(request_irq);
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void
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free_irq(unsigned int irq, void *dev_id)
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{
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irq_desc_t *desc;
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struct irqaction **p;
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unsigned long flags;
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if (irq >= ACTUAL_NR_IRQS) {
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printk(KERN_CRIT "Trying to free IRQ%d\n", irq);
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return;
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}
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desc = irq_desc + irq;
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spin_lock_irqsave(&desc->lock,flags);
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p = &desc->action;
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for (;;) {
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struct irqaction * action = *p;
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if (action) {
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struct irqaction **pp = p;
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p = &action->next;
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if (action->dev_id != dev_id)
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continue;
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/* Found - now remove it from the list of entries. */
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*pp = action->next;
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if (!desc->action) {
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desc->status |= IRQ_DISABLED;
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desc->handler->shutdown(irq);
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}
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spin_unlock_irqrestore(&desc->lock,flags);
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#ifdef CONFIG_SMP
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/* Wait to make sure it's not being used on
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another CPU. */
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while (desc->status & IRQ_INPROGRESS)
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barrier();
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#endif
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kfree(action);
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return;
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}
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printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
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spin_unlock_irqrestore(&desc->lock,flags);
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return;
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}
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}
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EXPORT_SYMBOL(free_irq);
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int
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show_interrupts(struct seq_file *p, void *v)
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{
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@ -531,10 +144,6 @@ handle_irq(int irq, struct pt_regs * regs)
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* 0 return value means that this irq is already being
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* handled by some other CPU. (or is disabled)
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*/
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int cpu = smp_processor_id();
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irq_desc_t *desc = irq_desc + irq;
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struct irqaction * action;
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unsigned int status;
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static unsigned int illegal_count=0;
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if ((unsigned) irq > ACTUAL_NR_IRQS && illegal_count < MAX_ILLEGAL_IRQS ) {
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@ -546,229 +155,8 @@ handle_irq(int irq, struct pt_regs * regs)
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}
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irq_enter();
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kstat_cpu(cpu).irqs[irq]++;
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spin_lock_irq(&desc->lock); /* mask also the higher prio events */
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desc->handler->ack(irq);
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/*
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* REPLAY is when Linux resends an IRQ that was dropped earlier.
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* WAITING is used by probe to mark irqs that are being tested.
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*/
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status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
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status |= IRQ_PENDING; /* we _want_ to handle it */
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/*
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* If the IRQ is disabled for whatever reason, we cannot
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* use the action we have.
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*/
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action = NULL;
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if (!(status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
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action = desc->action;
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status &= ~IRQ_PENDING; /* we commit to handling */
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status |= IRQ_INPROGRESS; /* we are handling it */
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}
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desc->status = status;
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/*
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* If there is no IRQ handler or it was disabled, exit early.
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* Since we set PENDING, if another processor is handling
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* a different instance of this same irq, the other processor
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* will take care of it.
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*/
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if (!action)
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goto out;
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/*
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* Edge triggered interrupts need to remember pending events.
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* This applies to any hw interrupts that allow a second
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* instance of the same irq to arrive while we are in handle_irq
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* 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
|
||||
|
||||
@ -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
|
||||
|
||||
/*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user