/*
+ * arch/ppc/kernel/irq.c
+ *
* Derived from arch/i386/kernel/irq.c
* Copyright (C) 1992 Linus Torvalds
* Adapted from arch/i386 by Gary Thomas
* to reduce code space and undefined function references.
*/
-#undef DEBUG
-
#include <linux/module.h>
#include <linux/threads.h>
#include <linux/kernel_stat.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
+#include <linux/config.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/cpumask.h>
#include <linux/profile.h>
#include <linux/bitops.h>
-#include <linux/list.h>
-#include <linux/radix-tree.h>
-#include <linux/mutex.h>
-#include <linux/bootmem.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
#include <asm/machdep.h>
-#include <asm/udbg.h>
#ifdef CONFIG_PPC_ISERIES
#include <asm/paca.h>
#endif
int __irq_offset_value;
-static int ppc_spurious_interrupts;
-
#ifdef CONFIG_PPC32
EXPORT_SYMBOL(__irq_offset_value);
-atomic_t ppc_n_lost_interrupts;
+#endif
+
+static int ppc_spurious_interrupts;
-#ifndef CONFIG_PPC_MERGE
+#ifdef CONFIG_PPC32
#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
+
unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
-#endif
+atomic_t ppc_n_lost_interrupts;
#ifdef CONFIG_TAU_INT
extern int tau_initialized;
extern int tau_interrupts(int);
#endif
-#endif /* CONFIG_PPC32 */
#if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
extern atomic_t ipi_recv;
extern atomic_t ipi_sent;
#endif
+#endif /* CONFIG_PPC32 */
#ifdef CONFIG_PPC64
EXPORT_SYMBOL(irq_desc);
int distribute_irqs = 1;
+u64 ppc64_interrupt_controller;
#endif /* CONFIG_PPC64 */
int show_interrupts(struct seq_file *p, void *v)
#else
seq_printf(p, "%10u ", kstat_irqs(i));
#endif /* CONFIG_SMP */
- if (desc->chip)
- seq_printf(p, " %s ", desc->chip->typename);
+ if (desc->handler)
+ seq_printf(p, " %s ", desc->handler->typename);
else
seq_puts(p, " None ");
seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge ");
#ifdef CONFIG_TAU_INT
if (tau_initialized){
seq_puts(p, "TAU: ");
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", tau_interrupts(j));
+ for (j = 0; j < NR_CPUS; j++)
+ if (cpu_online(j))
+ seq_printf(p, "%10u ", tau_interrupts(j));
seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
}
#endif
if (irq_desc[irq].status & IRQ_PER_CPU)
continue;
- cpus_and(mask, irq_desc[irq].affinity, map);
+ cpus_and(mask, irq_affinity[irq], map);
if (any_online_cpu(mask) == NR_CPUS) {
printk("Breaking affinity for irq %i\n", irq);
mask = map;
}
- if (irq_desc[irq].chip->set_affinity)
- irq_desc[irq].chip->set_affinity(irq, mask);
+ if (irq_desc[irq].handler->set_affinity)
+ irq_desc[irq].handler->set_affinity(irq, mask);
else if (irq_desc[irq].action && !(warned++))
printk("Cannot set affinity for irq %i\n", irq);
}
void do_IRQ(struct pt_regs *regs)
{
- unsigned int irq;
+ int irq;
#ifdef CONFIG_IRQSTACKS
struct thread_info *curtp, *irqtp;
#endif
*/
irq = ppc_md.get_irq(regs);
- if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
+ if (irq >= 0) {
#ifdef CONFIG_IRQSTACKS
/* Switch to the irq stack to handle this */
curtp = current_thread_info();
irqtp = hardirq_ctx[smp_processor_id()];
if (curtp != irqtp) {
- struct irq_desc *desc = irq_desc + irq;
- void *handler = desc->handle_irq;
- if (handler == NULL)
- handler = &__do_IRQ;
irqtp->task = curtp->task;
irqtp->flags = 0;
- call_handle_irq(irq, desc, regs, irqtp, handler);
+ call___do_IRQ(irq, regs, irqtp);
irqtp->task = NULL;
if (irqtp->flags)
set_bits(irqtp->flags, &curtp->flags);
} else
#endif
- generic_handle_irq(irq, regs);
- } else if (irq != NO_IRQ_IGNORE)
+ __do_IRQ(irq, regs);
+ } else if (irq != -2)
/* That's not SMP safe ... but who cares ? */
ppc_spurious_interrupts++;
void __init init_IRQ(void)
{
- ppc_md.init_IRQ();
#ifdef CONFIG_PPC64
- irq_ctx_init();
-#endif
-}
-
-
-#ifdef CONFIG_IRQSTACKS
-struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
-struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
-
-void irq_ctx_init(void)
-{
- struct thread_info *tp;
- int i;
+ static int once = 0;
- for_each_possible_cpu(i) {
- memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
- tp = softirq_ctx[i];
- tp->cpu = i;
- tp->preempt_count = SOFTIRQ_OFFSET;
-
- memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
- tp = hardirq_ctx[i];
- tp->cpu = i;
- tp->preempt_count = HARDIRQ_OFFSET;
- }
-}
-
-static inline void do_softirq_onstack(void)
-{
- struct thread_info *curtp, *irqtp;
-
- curtp = current_thread_info();
- irqtp = softirq_ctx[smp_processor_id()];
- irqtp->task = curtp->task;
- call_do_softirq(irqtp);
- irqtp->task = NULL;
-}
-
-#else
-#define do_softirq_onstack() __do_softirq()
-#endif /* CONFIG_IRQSTACKS */
-
-void do_softirq(void)
-{
- unsigned long flags;
-
- if (in_interrupt())
+ if (once)
return;
- local_irq_save(flags);
-
- if (local_softirq_pending())
- do_softirq_onstack();
+ once++;
- local_irq_restore(flags);
+#endif
+ ppc_md.init_IRQ();
+#ifdef CONFIG_PPC64
+ irq_ctx_init();
+#endif
}
-EXPORT_SYMBOL(do_softirq);
-
+#ifdef CONFIG_PPC64
/*
- * IRQ controller and virtual interrupts
+ * Virtual IRQ mapping code, used on systems with XICS interrupt controllers.
*/
-#ifdef CONFIG_PPC_MERGE
-
-static LIST_HEAD(irq_hosts);
-static spinlock_t irq_big_lock = SPIN_LOCK_UNLOCKED;
-static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
-static unsigned int irq_radix_writer;
-struct irq_map_entry irq_map[NR_IRQS];
-static unsigned int irq_virq_count = NR_IRQS;
-static struct irq_host *irq_default_host;
-
-struct irq_host *irq_alloc_host(unsigned int revmap_type,
- unsigned int revmap_arg,
- struct irq_host_ops *ops,
- irq_hw_number_t inval_irq)
-{
- struct irq_host *host;
- unsigned int size = sizeof(struct irq_host);
- unsigned int i;
- unsigned int *rmap;
- unsigned long flags;
+#define UNDEFINED_IRQ 0xffffffff
+unsigned int virt_irq_to_real_map[NR_IRQS];
- /* Allocate structure and revmap table if using linear mapping */
- if (revmap_type == IRQ_HOST_MAP_LINEAR)
- size += revmap_arg * sizeof(unsigned int);
- if (mem_init_done)
- host = kzalloc(size, GFP_KERNEL);
- else {
- host = alloc_bootmem(size);
- if (host)
- memset(host, 0, size);
- }
- if (host == NULL)
- return NULL;
-
- /* Fill structure */
- host->revmap_type = revmap_type;
- host->inval_irq = inval_irq;
- host->ops = ops;
-
- spin_lock_irqsave(&irq_big_lock, flags);
-
- /* If it's a legacy controller, check for duplicates and
- * mark it as allocated (we use irq 0 host pointer for that
- */
- if (revmap_type == IRQ_HOST_MAP_LEGACY) {
- if (irq_map[0].host != NULL) {
- spin_unlock_irqrestore(&irq_big_lock, flags);
- /* If we are early boot, we can't free the structure,
- * too bad...
- * this will be fixed once slab is made available early
- * instead of the current cruft
- */
- if (mem_init_done)
- kfree(host);
- return NULL;
- }
- irq_map[0].host = host;
- }
-
- list_add(&host->link, &irq_hosts);
- spin_unlock_irqrestore(&irq_big_lock, flags);
-
- /* Additional setups per revmap type */
- switch(revmap_type) {
- case IRQ_HOST_MAP_LEGACY:
- /* 0 is always the invalid number for legacy */
- host->inval_irq = 0;
- /* setup us as the host for all legacy interrupts */
- for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
- irq_map[i].hwirq = 0;
- smp_wmb();
- irq_map[i].host = host;
- smp_wmb();
-
- /* Clear norequest flags */
- get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
-
- /* Legacy flags are left to default at this point,
- * one can then use irq_create_mapping() to
- * explicitely change them
- */
- ops->map(host, i, i);
- }
- break;
- case IRQ_HOST_MAP_LINEAR:
- rmap = (unsigned int *)(host + 1);
- for (i = 0; i < revmap_arg; i++)
- rmap[i] = IRQ_NONE;
- host->revmap_data.linear.size = revmap_arg;
- smp_wmb();
- host->revmap_data.linear.revmap = rmap;
- break;
- default:
- break;
- }
-
- pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
-
- return host;
-}
-
-struct irq_host *irq_find_host(struct device_node *node)
-{
- struct irq_host *h, *found = NULL;
- unsigned long flags;
-
- /* We might want to match the legacy controller last since
- * it might potentially be set to match all interrupts in
- * the absence of a device node. This isn't a problem so far
- * yet though...
- */
- spin_lock_irqsave(&irq_big_lock, flags);
- list_for_each_entry(h, &irq_hosts, link)
- if (h->ops->match == NULL || h->ops->match(h, node)) {
- found = h;
- break;
- }
- spin_unlock_irqrestore(&irq_big_lock, flags);
- return found;
-}
-EXPORT_SYMBOL_GPL(irq_find_host);
-
-void irq_set_default_host(struct irq_host *host)
-{
- pr_debug("irq: Default host set to @0x%p\n", host);
-
- irq_default_host = host;
-}
-
-void irq_set_virq_count(unsigned int count)
-{
- pr_debug("irq: Trying to set virq count to %d\n", count);
-
- BUG_ON(count < NUM_ISA_INTERRUPTS);
- if (count < NR_IRQS)
- irq_virq_count = count;
-}
-
-/* radix tree not lockless safe ! we use a brlock-type mecanism
- * for now, until we can use a lockless radix tree
+/*
+ * Don't use virtual irqs 0, 1, 2 for devices.
+ * The pcnet32 driver considers interrupt numbers < 2 to be invalid,
+ * and 2 is the XICS IPI interrupt.
+ * We limit virtual irqs to 17 less than NR_IRQS so that when we
+ * offset them by 16 (to reserve the first 16 for ISA interrupts)
+ * we don't end up with an interrupt number >= NR_IRQS.
*/
-static void irq_radix_wrlock(unsigned long *flags)
-{
- unsigned int cpu, ok;
+#define MIN_VIRT_IRQ 3
+#define MAX_VIRT_IRQ (NR_IRQS - NUM_ISA_INTERRUPTS - 1)
+#define NR_VIRT_IRQS (MAX_VIRT_IRQ - MIN_VIRT_IRQ + 1)
- spin_lock_irqsave(&irq_big_lock, *flags);
- irq_radix_writer = 1;
- smp_mb();
- do {
- barrier();
- ok = 1;
- for_each_possible_cpu(cpu) {
- if (per_cpu(irq_radix_reader, cpu)) {
- ok = 0;
- break;
- }
- }
- if (!ok)
- cpu_relax();
- } while(!ok);
-}
-
-static void irq_radix_wrunlock(unsigned long flags)
-{
- smp_wmb();
- irq_radix_writer = 0;
- spin_unlock_irqrestore(&irq_big_lock, flags);
-}
-
-static void irq_radix_rdlock(unsigned long *flags)
+void
+virt_irq_init(void)
{
- local_irq_save(*flags);
- __get_cpu_var(irq_radix_reader) = 1;
- smp_mb();
- if (likely(irq_radix_writer == 0))
- return;
- __get_cpu_var(irq_radix_reader) = 0;
- smp_wmb();
- spin_lock(&irq_big_lock);
- __get_cpu_var(irq_radix_reader) = 1;
- spin_unlock(&irq_big_lock);
+ int i;
+ for (i = 0; i < NR_IRQS; i++)
+ virt_irq_to_real_map[i] = UNDEFINED_IRQ;
}
-static void irq_radix_rdunlock(unsigned long flags)
+/* Create a mapping for a real_irq if it doesn't already exist.
+ * Return the virtual irq as a convenience.
+ */
+int virt_irq_create_mapping(unsigned int real_irq)
{
- __get_cpu_var(irq_radix_reader) = 0;
- local_irq_restore(flags);
-}
+ unsigned int virq, first_virq;
+ static int warned;
+ if (ppc64_interrupt_controller == IC_OPEN_PIC)
+ return real_irq; /* no mapping for openpic (for now) */
-unsigned int irq_create_mapping(struct irq_host *host,
- irq_hw_number_t hwirq)
-{
- unsigned int virq, hint;
-
- pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
-
- /* Look for default host if nececssary */
- if (host == NULL)
- host = irq_default_host;
- if (host == NULL) {
- printk(KERN_WARNING "irq_create_mapping called for"
- " NULL host, hwirq=%lx\n", hwirq);
- WARN_ON(1);
- return NO_IRQ;
- }
- pr_debug("irq: -> using host @%p\n", host);
+ if (ppc64_interrupt_controller == IC_CELL_PIC)
+ return real_irq; /* no mapping for iic either */
- /* Check if mapping already exist, if it does, call
- * host->ops->map() to update the flags
- */
- virq = irq_find_mapping(host, hwirq);
- if (virq != IRQ_NONE) {
- pr_debug("irq: -> existing mapping on virq %d\n", virq);
- return virq;
+ /* don't map interrupts < MIN_VIRT_IRQ */
+ if (real_irq < MIN_VIRT_IRQ) {
+ virt_irq_to_real_map[real_irq] = real_irq;
+ return real_irq;
}
- /* Get a virtual interrupt number */
- if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
- /* Handle legacy */
- virq = (unsigned int)hwirq;
- if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
- return NO_IRQ;
- return virq;
- } else {
- /* Allocate a virtual interrupt number */
- hint = hwirq % irq_virq_count;
- virq = irq_alloc_virt(host, 1, hint);
- if (virq == NO_IRQ) {
- pr_debug("irq: -> virq allocation failed\n");
- return NO_IRQ;
- }
- }
- pr_debug("irq: -> obtained virq %d\n", virq);
-
- /* Clear IRQ_NOREQUEST flag */
- get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
-
- /* map it */
- smp_wmb();
- irq_map[virq].hwirq = hwirq;
- smp_mb();
- if (host->ops->map(host, virq, hwirq)) {
- pr_debug("irq: -> mapping failed, freeing\n");
- irq_free_virt(virq, 1);
- return NO_IRQ;
+ /* map to a number between MIN_VIRT_IRQ and MAX_VIRT_IRQ */
+ virq = real_irq;
+ if (virq > MAX_VIRT_IRQ)
+ virq = (virq % NR_VIRT_IRQS) + MIN_VIRT_IRQ;
+
+ /* search for this number or a free slot */
+ first_virq = virq;
+ while (virt_irq_to_real_map[virq] != UNDEFINED_IRQ) {
+ if (virt_irq_to_real_map[virq] == real_irq)
+ return virq;
+ if (++virq > MAX_VIRT_IRQ)
+ virq = MIN_VIRT_IRQ;
+ if (virq == first_virq)
+ goto nospace; /* oops, no free slots */
}
- return virq;
-}
-EXPORT_SYMBOL_GPL(irq_create_mapping);
-extern unsigned int irq_create_of_mapping(struct device_node *controller,
- u32 *intspec, unsigned int intsize)
-{
- struct irq_host *host;
- irq_hw_number_t hwirq;
- unsigned int type = IRQ_TYPE_NONE;
- unsigned int virq;
-
- if (controller == NULL)
- host = irq_default_host;
- else
- host = irq_find_host(controller);
- if (host == NULL) {
- printk(KERN_WARNING "irq: no irq host found for %s !\n",
- controller->full_name);
- return NO_IRQ;
- }
-
- /* If host has no translation, then we assume interrupt line */
- if (host->ops->xlate == NULL)
- hwirq = intspec[0];
- else {
- if (host->ops->xlate(host, controller, intspec, intsize,
- &hwirq, &type))
- return NO_IRQ;
- }
-
- /* Create mapping */
- virq = irq_create_mapping(host, hwirq);
- if (virq == NO_IRQ)
- return virq;
-
- /* Set type if specified and different than the current one */
- if (type != IRQ_TYPE_NONE &&
- type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
- set_irq_type(virq, type);
+ virt_irq_to_real_map[virq] = real_irq;
return virq;
-}
-EXPORT_SYMBOL_GPL(irq_create_of_mapping);
-
-unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
-{
- struct of_irq oirq;
-
- if (of_irq_map_one(dev, index, &oirq))
- return NO_IRQ;
-
- return irq_create_of_mapping(oirq.controller, oirq.specifier,
- oirq.size);
-}
-EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
-void irq_dispose_mapping(unsigned int virq)
-{
- struct irq_host *host = irq_map[virq].host;
- irq_hw_number_t hwirq;
- unsigned long flags;
-
- WARN_ON (host == NULL);
- if (host == NULL)
- return;
-
- /* Never unmap legacy interrupts */
- if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
- return;
-
- /* remove chip and handler */
- set_irq_chip_and_handler(virq, NULL, NULL);
-
- /* Make sure it's completed */
- synchronize_irq(virq);
-
- /* Tell the PIC about it */
- if (host->ops->unmap)
- host->ops->unmap(host, virq);
- smp_mb();
-
- /* Clear reverse map */
- hwirq = irq_map[virq].hwirq;
- switch(host->revmap_type) {
- case IRQ_HOST_MAP_LINEAR:
- if (hwirq < host->revmap_data.linear.size)
- host->revmap_data.linear.revmap[hwirq] = IRQ_NONE;
- break;
- case IRQ_HOST_MAP_TREE:
- /* Check if radix tree allocated yet */
- if (host->revmap_data.tree.gfp_mask == 0)
- break;
- irq_radix_wrlock(&flags);
- radix_tree_delete(&host->revmap_data.tree, hwirq);
- irq_radix_wrunlock(flags);
- break;
+ nospace:
+ if (!warned) {
+ printk(KERN_CRIT "Interrupt table is full\n");
+ printk(KERN_CRIT "Increase NR_IRQS (currently %d) "
+ "in your kernel sources and rebuild.\n", NR_IRQS);
+ warned = 1;
}
-
- /* Destroy map */
- smp_mb();
- irq_map[virq].hwirq = host->inval_irq;
-
- /* Set some flags */
- get_irq_desc(virq)->status |= IRQ_NOREQUEST;
-
- /* Free it */
- irq_free_virt(virq, 1);
-}
-EXPORT_SYMBOL_GPL(irq_dispose_mapping);
-
-unsigned int irq_find_mapping(struct irq_host *host,
- irq_hw_number_t hwirq)
-{
- unsigned int i;
- unsigned int hint = hwirq % irq_virq_count;
-
- /* Look for default host if nececssary */
- if (host == NULL)
- host = irq_default_host;
- if (host == NULL)
- return NO_IRQ;
-
- /* legacy -> bail early */
- if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
- return hwirq;
-
- /* Slow path does a linear search of the map */
- if (hint < NUM_ISA_INTERRUPTS)
- hint = NUM_ISA_INTERRUPTS;
- i = hint;
- do {
- if (irq_map[i].host == host &&
- irq_map[i].hwirq == hwirq)
- return i;
- i++;
- if (i >= irq_virq_count)
- i = NUM_ISA_INTERRUPTS;
- } while(i != hint);
return NO_IRQ;
}
-EXPORT_SYMBOL_GPL(irq_find_mapping);
-
-unsigned int irq_radix_revmap(struct irq_host *host,
- irq_hw_number_t hwirq)
+/*
+ * In most cases will get a hit on the very first slot checked in the
+ * virt_irq_to_real_map. Only when there are a large number of
+ * IRQs will this be expensive.
+ */
+unsigned int real_irq_to_virt_slowpath(unsigned int real_irq)
{
- struct radix_tree_root *tree;
- struct irq_map_entry *ptr;
unsigned int virq;
- unsigned long flags;
+ unsigned int first_virq;
- WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
+ virq = real_irq;
- /* Check if the radix tree exist yet. We test the value of
- * the gfp_mask for that. Sneaky but saves another int in the
- * structure. If not, we fallback to slow mode
- */
- tree = &host->revmap_data.tree;
- if (tree->gfp_mask == 0)
- return irq_find_mapping(host, hwirq);
-
- /* Now try to resolve */
- irq_radix_rdlock(&flags);
- ptr = radix_tree_lookup(tree, hwirq);
- irq_radix_rdunlock(flags);
-
- /* Found it, return */
- if (ptr) {
- virq = ptr - irq_map;
- return virq;
- }
+ if (virq > MAX_VIRT_IRQ)
+ virq = (virq % NR_VIRT_IRQS) + MIN_VIRT_IRQ;
- /* If not there, try to insert it */
- virq = irq_find_mapping(host, hwirq);
- if (virq != NO_IRQ) {
- irq_radix_wrlock(&flags);
- radix_tree_insert(tree, hwirq, &irq_map[virq]);
- irq_radix_wrunlock(flags);
- }
- return virq;
-}
+ first_virq = virq;
-unsigned int irq_linear_revmap(struct irq_host *host,
- irq_hw_number_t hwirq)
-{
- unsigned int *revmap;
+ do {
+ if (virt_irq_to_real_map[virq] == real_irq)
+ return virq;
- WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
+ virq++;
- /* Check revmap bounds */
- if (unlikely(hwirq >= host->revmap_data.linear.size))
- return irq_find_mapping(host, hwirq);
+ if (virq >= MAX_VIRT_IRQ)
+ virq = 0;
- /* Check if revmap was allocated */
- revmap = host->revmap_data.linear.revmap;
- if (unlikely(revmap == NULL))
- return irq_find_mapping(host, hwirq);
+ } while (first_virq != virq);
- /* Fill up revmap with slow path if no mapping found */
- if (unlikely(revmap[hwirq] == NO_IRQ))
- revmap[hwirq] = irq_find_mapping(host, hwirq);
+ return NO_IRQ;
- return revmap[hwirq];
}
-unsigned int irq_alloc_virt(struct irq_host *host,
- unsigned int count,
- unsigned int hint)
-{
- unsigned long flags;
- unsigned int i, j, found = NO_IRQ;
- unsigned int limit = irq_virq_count - count;
-
- if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
- return NO_IRQ;
-
- spin_lock_irqsave(&irq_big_lock, flags);
-
- /* Use hint for 1 interrupt if any */
- if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
- hint < irq_virq_count && irq_map[hint].host == NULL) {
- found = hint;
- goto hint_found;
- }
-
- /* Look for count consecutive numbers in the allocatable
- * (non-legacy) space
- */
- for (i = NUM_ISA_INTERRUPTS; i <= limit; ) {
- for (j = i; j < (i + count); j++)
- if (irq_map[j].host != NULL) {
- i = j + 1;
- continue;
- }
- found = i;
- break;
- }
- if (found == NO_IRQ) {
- spin_unlock_irqrestore(&irq_big_lock, flags);
- return NO_IRQ;
- }
- hint_found:
- for (i = found; i < (found + count); i++) {
- irq_map[i].hwirq = host->inval_irq;
- smp_wmb();
- irq_map[i].host = host;
- }
- spin_unlock_irqrestore(&irq_big_lock, flags);
- return found;
-}
+#ifdef CONFIG_IRQSTACKS
+struct thread_info *softirq_ctx[NR_CPUS];
+struct thread_info *hardirq_ctx[NR_CPUS];
-void irq_free_virt(unsigned int virq, unsigned int count)
+void irq_ctx_init(void)
{
- unsigned long flags;
- unsigned int i;
-
- WARN_ON (virq < NUM_ISA_INTERRUPTS);
- WARN_ON (count == 0 || (virq + count) > irq_virq_count);
-
- spin_lock_irqsave(&irq_big_lock, flags);
- for (i = virq; i < (virq + count); i++) {
- struct irq_host *host;
+ struct thread_info *tp;
+ int i;
- if (i < NUM_ISA_INTERRUPTS ||
- (virq + count) > irq_virq_count)
- continue;
+ for_each_cpu(i) {
+ memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
+ tp = softirq_ctx[i];
+ tp->cpu = i;
+ tp->preempt_count = SOFTIRQ_OFFSET;
- host = irq_map[i].host;
- irq_map[i].hwirq = host->inval_irq;
- smp_wmb();
- irq_map[i].host = NULL;
+ memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
+ tp = hardirq_ctx[i];
+ tp->cpu = i;
+ tp->preempt_count = HARDIRQ_OFFSET;
}
- spin_unlock_irqrestore(&irq_big_lock, flags);
}
-void irq_early_init(void)
-{
- unsigned int i;
-
- for (i = 0; i < NR_IRQS; i++)
- get_irq_desc(i)->status |= IRQ_NOREQUEST;
-}
-
-/* We need to create the radix trees late */
-static int irq_late_init(void)
+void do_softirq(void)
{
- struct irq_host *h;
unsigned long flags;
+ struct thread_info *curtp, *irqtp;
- irq_radix_wrlock(&flags);
- list_for_each_entry(h, &irq_hosts, link) {
- if (h->revmap_type == IRQ_HOST_MAP_TREE)
- INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
- }
- irq_radix_wrunlock(flags);
-
- return 0;
-}
-arch_initcall(irq_late_init);
+ if (in_interrupt())
+ return;
-#endif /* CONFIG_PPC_MERGE */
+ local_irq_save(flags);
-#ifdef CONFIG_PCI_MSI
-int pci_enable_msi(struct pci_dev * pdev)
-{
- if (ppc_md.enable_msi)
- return ppc_md.enable_msi(pdev);
- else
- return -1;
-}
+ if (local_softirq_pending()) {
+ curtp = current_thread_info();
+ irqtp = softirq_ctx[smp_processor_id()];
+ irqtp->task = curtp->task;
+ call_do_softirq(irqtp);
+ irqtp->task = NULL;
+ }
-void pci_disable_msi(struct pci_dev * pdev)
-{
- if (ppc_md.disable_msi)
- ppc_md.disable_msi(pdev);
+ local_irq_restore(flags);
}
+EXPORT_SYMBOL(do_softirq);
-void pci_scan_msi_device(struct pci_dev *dev) {}
-int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
-void pci_disable_msix(struct pci_dev *dev) {}
-void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
-void disable_msi_mode(struct pci_dev *dev, int pos, int type) {}
-void pci_no_msi(void) {}
-
-#endif
+#endif /* CONFIG_IRQSTACKS */
-#ifdef CONFIG_PPC64
static int __init setup_noirqdistrib(char *str)
{
distribute_irqs = 0;
git://git.onelab.eu / linux-2.6.git / blobdiff