struct irq_work_struct __irq_work[NR_CPUS];
#define irq_work(__cpu, __pil) &(__irq_work[(__cpu)].irq_worklists[(__pil)])
-#ifdef CONFIG_PCI
-/* This is a table of physical addresses used to deal with IBF_DMA_SYNC.
- * It is used for PCI only to synchronize DMA transfers with IRQ delivery
- * for devices behind busses other than APB on Sabre systems.
- *
- * Currently these physical addresses are just config space accesses
- * to the command register for that device.
- */
-unsigned long pci_dma_wsync;
-unsigned long dma_sync_reg_table[256];
-unsigned char dma_sync_reg_table_entry = 0;
-#endif
-
-/* This is based upon code in the 32-bit Sparc kernel written mostly by
- * David Redman (djhr@tadpole.co.uk).
- */
-#define MAX_STATIC_ALLOC 4
-static struct irqaction static_irqaction[MAX_STATIC_ALLOC];
-static int static_irq_count;
-
-/* This is exported so that fast IRQ handlers can get at it... -DaveM */
-struct irqaction *irq_action[NR_IRQS+1] = {
- NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL,
- NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL
-};
+static struct irqaction *irq_action[NR_IRQS+1];
/* This only synchronizes entities which modify IRQ handler
* state and some selected user-level spots that want to
* the CPU %tick register and not by some normal vectored interrupt
* source. To handle this special case, we use this dummy INO bucket.
*/
+static struct irq_desc pil0_dummy_desc;
static struct ino_bucket pil0_dummy_bucket = {
- 0, /* irq_chain */
- 0, /* pil */
- 0, /* pending */
- 0, /* flags */
- 0, /* __unused */
- NULL, /* irq_info */
- 0UL, /* iclr */
- 0UL, /* imap */
+ .irq_info = &pil0_dummy_desc,
};
+static void build_irq_error(const char *msg, unsigned int ino, int pil, int inofixup,
+ unsigned long iclr, unsigned long imap,
+ struct ino_bucket *bucket)
+{
+ prom_printf("IRQ: INO %04x (%d:%016lx:%016lx) --> "
+ "(%d:%d:%016lx:%016lx), halting...\n",
+ ino, bucket->pil, bucket->iclr, bucket->imap,
+ pil, inofixup, iclr, imap);
+ prom_halt();
+}
+
unsigned int build_irq(int pil, int inofixup, unsigned long iclr, unsigned long imap)
{
struct ino_bucket *bucket;
prom_halt();
}
- /* Ok, looks good, set it up. Don't touch the irq_chain or
- * the pending flag.
- */
bucket = &ivector_table[ino];
- if ((bucket->flags & IBF_ACTIVE) ||
- (bucket->irq_info != NULL)) {
- /* This is a gross fatal error if it happens here. */
- prom_printf("IRQ: Trying to reinit INO bucket, fatal error.\n");
- prom_printf("IRQ: Request INO %04x (%d:%d:%016lx:%016lx)\n",
- ino, pil, inofixup, iclr, imap);
- prom_printf("IRQ: Existing (%d:%016lx:%016lx)\n",
- bucket->pil, bucket->iclr, bucket->imap);
- prom_printf("IRQ: Cannot continue, halting...\n");
+ if (bucket->flags & IBF_ACTIVE)
+ build_irq_error("IRQ: Trying to build active INO bucket.\n",
+ ino, pil, inofixup, iclr, imap, bucket);
+
+ if (bucket->irq_info) {
+ if (bucket->imap != imap || bucket->iclr != iclr)
+ build_irq_error("IRQ: Trying to reinit INO bucket.\n",
+ ino, pil, inofixup, iclr, imap, bucket);
+
+ goto out;
+ }
+
+ bucket->irq_info = kmalloc(sizeof(struct irq_desc), GFP_ATOMIC);
+ if (!bucket->irq_info) {
+ prom_printf("IRQ: Error, kmalloc(irq_desc) failed.\n");
prom_halt();
}
+ memset(bucket->irq_info, 0, sizeof(struct irq_desc));
+
+ /* Ok, looks good, set it up. Don't touch the irq_chain or
+ * the pending flag.
+ */
bucket->imap = imap;
bucket->iclr = iclr;
bucket->pil = pil;
bucket->flags = 0;
- bucket->irq_info = NULL;
-
+out:
return __irq(bucket);
}
__asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
}
+static int check_irq_sharing(int pil, unsigned long irqflags)
+{
+ struct irqaction *action, *tmp;
+
+ action = *(irq_action + pil);
+ if (action) {
+ if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
+ for (tmp = action; tmp->next; tmp = tmp->next)
+ ;
+ } else {
+ return -EBUSY;
+ }
+ }
+ return 0;
+}
+
+static void append_irq_action(int pil, struct irqaction *action)
+{
+ struct irqaction **pp = irq_action + pil;
+
+ while (*pp)
+ pp = &((*pp)->next);
+ *pp = action;
+}
+
+static struct irqaction *get_action_slot(struct ino_bucket *bucket)
+{
+ struct irq_desc *desc = bucket->irq_info;
+ int max_irq, i;
+
+ max_irq = 1;
+ if (bucket->flags & IBF_PCI)
+ max_irq = MAX_IRQ_DESC_ACTION;
+ for (i = 0; i < max_irq; i++) {
+ struct irqaction *p = &desc->action[i];
+ u32 mask = (1 << i);
+
+ if (desc->action_active_mask & mask)
+ continue;
+
+ desc->action_active_mask |= mask;
+ return p;
+ }
+ return NULL;
+}
+
int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags, const char *name, void *dev_id)
{
- struct irqaction *action, *tmp = NULL;
+ struct irqaction *action;
struct ino_bucket *bucket = __bucket(irq);
unsigned long flags;
int pending = 0;
- if ((bucket != &pil0_dummy_bucket) &&
- (bucket < &ivector_table[0] ||
- bucket >= &ivector_table[NUM_IVECS])) {
- unsigned int *caller;
-
- __asm__ __volatile__("mov %%i7, %0" : "=r" (caller));
- printk(KERN_CRIT "request_irq: Old style IRQ registry attempt "
- "from %p, irq %08x.\n", caller, irq);
+ if (unlikely(!handler))
return -EINVAL;
- }
- if (!handler)
- return -EINVAL;
+
+ if (unlikely(!bucket->irq_info))
+ return -ENODEV;
if ((bucket != &pil0_dummy_bucket) && (irqflags & SA_SAMPLE_RANDOM)) {
/*
spin_lock_irqsave(&irq_action_lock, flags);
- action = *(bucket->pil + irq_action);
- if (action) {
- if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ))
- for (tmp = action; tmp->next; tmp = tmp->next)
- ;
- else {
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return -EBUSY;
- }
- action = NULL; /* Or else! */
+ if (check_irq_sharing(bucket->pil, irqflags)) {
+ spin_unlock_irqrestore(&irq_action_lock, flags);
+ return -EBUSY;
}
- /* If this is flagged as statically allocated then we use our
- * private struct which is never freed.
- */
- if (irqflags & SA_STATIC_ALLOC) {
- if (static_irq_count < MAX_STATIC_ALLOC)
- action = &static_irqaction[static_irq_count++];
- else
- printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed "
- "using kmalloc\n", irq, name);
- }
- if (action == NULL)
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
- GFP_ATOMIC);
-
+ action = get_action_slot(bucket);
if (!action) {
spin_unlock_irqrestore(&irq_action_lock, flags);
return -ENOMEM;
}
- if (bucket == &pil0_dummy_bucket) {
- bucket->irq_info = action;
- bucket->flags |= IBF_ACTIVE;
- } else {
- if ((bucket->flags & IBF_ACTIVE) != 0) {
- void *orig = bucket->irq_info;
- void **vector = NULL;
-
- if ((bucket->flags & IBF_PCI) == 0) {
- printk("IRQ: Trying to share non-PCI bucket.\n");
- goto free_and_ebusy;
- }
- if ((bucket->flags & IBF_MULTI) == 0) {
- vector = kmalloc(sizeof(void *) * 4, GFP_ATOMIC);
- if (vector == NULL)
- goto free_and_enomem;
-
- /* We might have slept. */
- if ((bucket->flags & IBF_MULTI) != 0) {
- int ent;
-
- kfree(vector);
- vector = (void **)bucket->irq_info;
- for(ent = 0; ent < 4; ent++) {
- if (vector[ent] == NULL) {
- vector[ent] = action;
- break;
- }
- }
- if (ent == 4)
- goto free_and_ebusy;
- } else {
- vector[0] = orig;
- vector[1] = action;
- vector[2] = NULL;
- vector[3] = NULL;
- bucket->irq_info = vector;
- bucket->flags |= IBF_MULTI;
- }
- } else {
- int ent;
-
- vector = (void **)orig;
- for (ent = 0; ent < 4; ent++) {
- if (vector[ent] == NULL) {
- vector[ent] = action;
- break;
- }
- }
- if (ent == 4)
- goto free_and_ebusy;
- }
- } else {
- bucket->irq_info = action;
- bucket->flags |= IBF_ACTIVE;
- }
+ bucket->flags |= IBF_ACTIVE;
+ pending = 0;
+ if (bucket != &pil0_dummy_bucket) {
pending = bucket->pending;
if (pending)
bucket->pending = 0;
put_ino_in_irqaction(action, irq);
put_smpaff_in_irqaction(action, CPU_MASK_NONE);
- if (tmp)
- tmp->next = action;
- else
- *(bucket->pil + irq_action) = action;
+ append_irq_action(bucket->pil, action);
enable_irq(irq);
atomic_bucket_insert(bucket);
set_softint(1 << bucket->pil);
}
+
spin_unlock_irqrestore(&irq_action_lock, flags);
- if ((bucket != &pil0_dummy_bucket) && (!(irqflags & SA_STATIC_ALLOC)))
+
+ if (bucket != &pil0_dummy_bucket)
register_irq_proc(__irq_ino(irq));
#ifdef CONFIG_SMP
distribute_irqs();
#endif
return 0;
-
-free_and_ebusy:
- kfree(action);
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return -EBUSY;
-
-free_and_enomem:
- kfree(action);
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return -ENOMEM;
}
EXPORT_SYMBOL(request_irq);
-void free_irq(unsigned int irq, void *dev_id)
+static struct irqaction *unlink_irq_action(unsigned int irq, void *dev_id)
{
- struct irqaction *action;
- struct irqaction *tmp = NULL;
- unsigned long flags;
- struct ino_bucket *bucket = __bucket(irq), *bp;
-
- if ((bucket != &pil0_dummy_bucket) &&
- (bucket < &ivector_table[0] ||
- bucket >= &ivector_table[NUM_IVECS])) {
- unsigned int *caller;
+ struct ino_bucket *bucket = __bucket(irq);
+ struct irqaction *action, **pp;
- __asm__ __volatile__("mov %%i7, %0" : "=r" (caller));
- printk(KERN_CRIT "free_irq: Old style IRQ removal attempt "
- "from %p, irq %08x.\n", caller, irq);
- return;
- }
-
- spin_lock_irqsave(&irq_action_lock, flags);
+ pp = irq_action + bucket->pil;
+ action = *pp;
+ if (unlikely(!action))
+ return NULL;
- action = *(bucket->pil + irq_action);
- if (!action->handler) {
+ if (unlikely(!action->handler)) {
printk("Freeing free IRQ %d\n", bucket->pil);
- return;
- }
- if (dev_id) {
- for ( ; action; action = action->next) {
- if (action->dev_id == dev_id)
- break;
- tmp = action;
- }
- if (!action) {
- printk("Trying to free free shared IRQ %d\n", bucket->pil);
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return;
- }
- } else if (action->flags & SA_SHIRQ) {
- printk("Trying to free shared IRQ %d with NULL device ID\n", bucket->pil);
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return;
+ return NULL;
}
- if (action->flags & SA_STATIC_ALLOC) {
- printk("Attempt to free statically allocated IRQ %d (%s)\n",
- bucket->pil, action->name);
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return;
+ while (action && action->dev_id != dev_id) {
+ pp = &action->next;
+ action = *pp;
}
- if (action && tmp)
- tmp->next = action->next;
- else
- *(bucket->pil + irq_action) = action->next;
+ if (likely(action))
+ *pp = action->next;
+
+ return action;
+}
+
+void free_irq(unsigned int irq, void *dev_id)
+{
+ struct irqaction *action;
+ struct ino_bucket *bucket;
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_action_lock, flags);
+
+ action = unlink_irq_action(irq, dev_id);
spin_unlock_irqrestore(&irq_action_lock, flags);
+ if (unlikely(!action))
+ return;
+
synchronize_irq(irq);
spin_lock_irqsave(&irq_action_lock, flags);
+ bucket = __bucket(irq);
if (bucket != &pil0_dummy_bucket) {
+ struct irq_desc *desc = bucket->irq_info;
unsigned long imap = bucket->imap;
- void **vector, *orig;
- int ent;
-
- orig = bucket->irq_info;
- vector = (void **)orig;
-
- if ((bucket->flags & IBF_MULTI) != 0) {
- int other = 0;
- void *orphan = NULL;
- for (ent = 0; ent < 4; ent++) {
- if (vector[ent] == action)
- vector[ent] = NULL;
- else if (vector[ent] != NULL) {
- orphan = vector[ent];
- other++;
- }
- }
+ int ent, i;
- /* Only free when no other shared irq
- * uses this bucket.
- */
- if (other) {
- if (other == 1) {
- /* Convert back to non-shared bucket. */
- bucket->irq_info = orphan;
- bucket->flags &= ~(IBF_MULTI);
- kfree(vector);
- }
- goto out;
+ for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) {
+ struct irqaction *p = &desc->action[i];
+
+ if (p == action) {
+ desc->action_active_mask &= ~(1 << i);
+ break;
}
- } else {
- bucket->irq_info = NULL;
}
- /* This unique interrupt source is now inactive. */
- bucket->flags &= ~IBF_ACTIVE;
+ if (!desc->action_active_mask) {
+ /* This unique interrupt source is now inactive. */
+ bucket->flags &= ~IBF_ACTIVE;
- /* See if any other buckets share this bucket's IMAP
- * and are still active.
- */
- for (ent = 0; ent < NUM_IVECS; ent++) {
- bp = &ivector_table[ent];
- if (bp != bucket &&
- bp->imap == imap &&
- (bp->flags & IBF_ACTIVE) != 0)
- break;
- }
+ /* See if any other buckets share this bucket's IMAP
+ * and are still active.
+ */
+ for (ent = 0; ent < NUM_IVECS; ent++) {
+ struct ino_bucket *bp = &ivector_table[ent];
+ if (bp != bucket &&
+ bp->imap == imap &&
+ (bp->flags & IBF_ACTIVE) != 0)
+ break;
+ }
- /* Only disable when no other sub-irq levels of
- * the same IMAP are active.
- */
- if (ent == NUM_IVECS)
- disable_irq(irq);
+ /* Only disable when no other sub-irq levels of
+ * the same IMAP are active.
+ */
+ if (ent == NUM_IVECS)
+ disable_irq(irq);
+ }
}
-out:
- kfree(action);
spin_unlock_irqrestore(&irq_action_lock, flags);
}
}
#endif /* CONFIG_SMP */
-void catch_disabled_ivec(struct pt_regs *regs)
-{
- int cpu = smp_processor_id();
- struct ino_bucket *bucket = __bucket(*irq_work(cpu, 0));
-
- /* We can actually see this on Ultra/PCI PCI cards, which are bridges
- * to other devices. Here a single IMAP enabled potentially multiple
- * unique interrupt sources (which each do have a unique ICLR register.
- *
- * So what we do is just register that the IVEC arrived, when registered
- * for real the request_irq() code will check the bit and signal
- * a local CPU interrupt for it.
- */
-#if 0
- printk("IVEC: Spurious interrupt vector (%x) received at (%016lx)\n",
- bucket - &ivector_table[0], regs->tpc);
-#endif
- *irq_work(cpu, 0) = 0;
- bucket->pending = 1;
-}
-
-/* Tune this... */
-#define FORWARD_VOLUME 12
-
-#ifdef CONFIG_SMP
-
-static inline void redirect_intr(int cpu, struct ino_bucket *bp)
+static void process_bucket(int irq, struct ino_bucket *bp, struct pt_regs *regs)
{
- /* Ok, here is what is going on:
- * 1) Retargeting IRQs on Starfire is very
- * expensive so just forget about it on them.
- * 2) Moving around very high priority interrupts
- * is a losing game.
- * 3) If the current cpu is idle, interrupts are
- * useful work, so keep them here. But do not
- * pass to our neighbour if he is not very idle.
- * 4) If sysadmin explicitly asks for directed intrs,
- * Just Do It.
- */
- struct irqaction *ap = bp->irq_info;
- cpumask_t cpu_mask;
- unsigned int buddy, ticks;
+ struct irq_desc *desc = bp->irq_info;
+ unsigned char flags = bp->flags;
+ u32 action_mask, i;
+ int random;
- cpu_mask = get_smpaff_in_irqaction(ap);
- cpus_and(cpu_mask, cpu_mask, cpu_online_map);
- if (cpus_empty(cpu_mask))
- cpu_mask = cpu_online_map;
+ bp->flags |= IBF_INPROGRESS;
- if (this_is_starfire != 0 ||
- bp->pil >= 10 || current->pid == 0)
+ if (unlikely(!(flags & IBF_ACTIVE))) {
+ bp->pending = 1;
goto out;
-
- /* 'cpu' is the MID (ie. UPAID), calculate the MID
- * of our buddy.
- */
- buddy = cpu + 1;
- if (buddy >= NR_CPUS)
- buddy = 0;
-
- ticks = 0;
- while (!cpu_isset(buddy, cpu_mask)) {
- if (++buddy >= NR_CPUS)
- buddy = 0;
- if (++ticks > NR_CPUS) {
- put_smpaff_in_irqaction(ap, CPU_MASK_NONE);
- goto out;
- }
}
- if (buddy == cpu)
- goto out;
+ if (desc->pre_handler)
+ desc->pre_handler(bp,
+ desc->pre_handler_arg1,
+ desc->pre_handler_arg2);
- /* Voo-doo programming. */
- if (cpu_data(buddy).idle_volume < FORWARD_VOLUME)
- goto out;
+ action_mask = desc->action_active_mask;
+ random = 0;
+ for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) {
+ struct irqaction *p = &desc->action[i];
+ u32 mask = (1 << i);
- /* This just so happens to be correct on Cheetah
- * at the moment.
- */
- buddy <<= 26;
+ if (!(action_mask & mask))
+ continue;
+
+ action_mask &= ~mask;
- /* Push it to our buddy. */
- upa_writel(buddy | IMAP_VALID, bp->imap);
+ if (p->handler(__irq(bp), p->dev_id, regs) == IRQ_HANDLED)
+ random |= p->flags;
+ if (!action_mask)
+ break;
+ }
+ if (bp->pil != 0) {
+ upa_writel(ICLR_IDLE, bp->iclr);
+ /* Test and add entropy */
+ if (random & SA_SAMPLE_RANDOM)
+ add_interrupt_randomness(irq);
+ }
out:
- return;
+ bp->flags &= ~IBF_INPROGRESS;
}
-#endif
-
void handler_irq(int irq, struct pt_regs *regs)
{
- struct ino_bucket *bp, *nbp;
+ struct ino_bucket *bp;
int cpu = smp_processor_id();
#ifndef CONFIG_SMP
clear_softint(clr_mask);
}
#else
- int should_forward = 0;
-
clear_softint(1 << irq);
#endif
#else
bp = __bucket(xchg32(irq_work(cpu, irq), 0));
#endif
- for ( ; bp != NULL; bp = nbp) {
- unsigned char flags = bp->flags;
- unsigned char random = 0;
+ while (bp) {
+ struct ino_bucket *nbp = __bucket(bp->irq_chain);
- nbp = __bucket(bp->irq_chain);
bp->irq_chain = 0;
-
- bp->flags |= IBF_INPROGRESS;
-
- if ((flags & IBF_ACTIVE) != 0) {
-#ifdef CONFIG_PCI
- if ((flags & IBF_DMA_SYNC) != 0) {
- upa_readl(dma_sync_reg_table[bp->synctab_ent]);
- upa_readq(pci_dma_wsync);
- }
-#endif
- if ((flags & IBF_MULTI) == 0) {
- struct irqaction *ap = bp->irq_info;
- int ret;
-
- ret = ap->handler(__irq(bp), ap->dev_id, regs);
- if (ret == IRQ_HANDLED)
- random |= ap->flags;
- } else {
- void **vector = (void **)bp->irq_info;
- int ent;
- for (ent = 0; ent < 4; ent++) {
- struct irqaction *ap = vector[ent];
- if (ap != NULL) {
- int ret;
-
- ret = ap->handler(__irq(bp),
- ap->dev_id,
- regs);
- if (ret == IRQ_HANDLED)
- random |= ap->flags;
- }
- }
- }
- /* Only the dummy bucket lacks IMAP/ICLR. */
- if (bp->pil != 0) {
-#ifdef CONFIG_SMP
- if (should_forward) {
- redirect_intr(cpu, bp);
- should_forward = 0;
- }
-#endif
- upa_writel(ICLR_IDLE, bp->iclr);
-
- /* Test and add entropy */
- if (random & SA_SAMPLE_RANDOM)
- add_interrupt_randomness(irq);
- }
- } else
- bp->pending = 1;
-
- bp->flags &= ~IBF_INPROGRESS;
+ process_bucket(irq, bp, regs);
+ bp = nbp;
}
irq_exit();
}
*/
for (level = 1; level < NR_IRQS; level++) {
struct irqaction *p = irq_action[level];
- if (level == 12) continue;
+
+ if (level == 12)
+ continue;
+
while(p) {
cpu = retarget_one_irq(p, cpu);
p = p->next;
projects / linux-2.6 / commitdiff