iosapic.c

linux2.6.16版本

	spin_lock_irqsave(&irq_descp(vector)->lock, flags);
	spin_lock(&iosapic_lock);
	{
		if (gsi_to_vector(gsi) > 0) {
			if (list_empty(&iosapic_intr_info[vector].rtes))
				free_irq_vector(vector);
			spin_unlock(&iosapic_lock);
			spin_unlock_irqrestore(&irq_descp(vector)->lock, flags);
			goto again;
		}

		dest = get_target_cpu(gsi, vector);
		err = register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY,
			      polarity, trigger);
		if (err < 0) {
			spin_unlock(&iosapic_lock);
			spin_unlock_irqrestore(&irq_descp(vector)->lock, flags);
			return err;
		}

		/*
		 * If the vector is shared and already unmasked for
		 * other interrupt sources, don't mask it.
		 */
		low32 = iosapic_intr_info[vector].low32;
		if (vector_is_shared(vector) && !(low32 & IOSAPIC_MASK))
			mask = 0;
		set_rte(gsi, vector, dest, mask);
	}
	spin_unlock(&iosapic_lock);
	spin_unlock_irqrestore(&irq_descp(vector)->lock, flags);

	printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",
	       gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
	       (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
	       cpu_logical_id(dest), dest, vector);

	return vector;
}

void
iosapic_unregister_intr (unsigned int gsi)
{
	unsigned long flags;
	int irq, vector, index;
	irq_desc_t *idesc;
	u32 low32;
	unsigned long trigger, polarity;
	unsigned int dest;
	struct iosapic_rte_info *rte;

	/*
	 * If the irq associated with the gsi is not found,
	 * iosapic_unregister_intr() is unbalanced. We need to check
	 * this again after getting locks.
	 */
	irq = gsi_to_irq(gsi);
	if (irq < 0) {
		printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", gsi);
		WARN_ON(1);
		return;
	}
	vector = irq_to_vector(irq);

	idesc = irq_descp(irq);
	spin_lock_irqsave(&idesc->lock, flags);
	spin_lock(&iosapic_lock);
	{
		if ((rte = gsi_vector_to_rte(gsi, vector)) == NULL) {
			printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", gsi);
			WARN_ON(1);
			goto out;
		}

		if (--rte->refcnt > 0)
			goto out;

		/* Mask the interrupt */
		low32 = iosapic_intr_info[vector].low32 | IOSAPIC_MASK;
		iosapic_write(rte->addr, IOSAPIC_RTE_LOW(rte->rte_index), low32);

		/* Remove the rte entry from the list */
		list_del(&rte->rte_list);
		iosapic_intr_info[vector].count--;
		iosapic_free_rte(rte);
		index = find_iosapic(gsi);
		iosapic_lists[index].rtes_inuse--;
		WARN_ON(iosapic_lists[index].rtes_inuse < 0);

		trigger	 = iosapic_intr_info[vector].trigger;
		polarity = iosapic_intr_info[vector].polarity;
		dest     = iosapic_intr_info[vector].dest;
		printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d unregistered\n",
		       gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
		       (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
		       cpu_logical_id(dest), dest, vector);

		if (list_empty(&iosapic_intr_info[vector].rtes)) {
			/* Sanity check */
			BUG_ON(iosapic_intr_info[vector].count);

			/* Clear the interrupt controller descriptor */
			idesc->handler = &no_irq_type;

			/* Clear the interrupt information */
			memset(&iosapic_intr_info[vector], 0, sizeof(struct iosapic_intr_info));
			iosapic_intr_info[vector].low32 |= IOSAPIC_MASK;
			INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes);

			if (idesc->action) {
				printk(KERN_ERR "interrupt handlers still exist on IRQ %u\n", irq);
				WARN_ON(1);
			}

			/* Free the interrupt vector */
			free_irq_vector(vector);
		}
	}
 out:
	spin_unlock(&iosapic_lock);
	spin_unlock_irqrestore(&idesc->lock, flags);
}

/*
 * ACPI calls this when it finds an entry for a platform interrupt.
 * Note that the irq_base and IOSAPIC address must be set in iosapic_init().
 */
int __init
iosapic_register_platform_intr (u32 int_type, unsigned int gsi,
				int iosapic_vector, u16 eid, u16 id,
				unsigned long polarity, unsigned long trigger)
{
	static const char * const name[] = {"unknown", "PMI", "INIT", "CPEI"};
	unsigned char delivery;
	int vector, mask = 0;
	unsigned int dest = ((id << 8) | eid) & 0xffff;

	switch (int_type) {
	      case ACPI_INTERRUPT_PMI:
		vector = iosapic_vector;
		/*
		 * since PMI vector is alloc'd by FW(ACPI) not by kernel,
		 * we need to make sure the vector is available
		 */
		iosapic_reassign_vector(vector);
		delivery = IOSAPIC_PMI;
		break;
	      case ACPI_INTERRUPT_INIT:
		vector = assign_irq_vector(AUTO_ASSIGN);
		if (vector < 0)
			panic("%s: out of interrupt vectors!\n", __FUNCTION__);
		delivery = IOSAPIC_INIT;
		break;
	      case ACPI_INTERRUPT_CPEI:
		vector = IA64_CPE_VECTOR;
		delivery = IOSAPIC_LOWEST_PRIORITY;
		mask = 1;
		break;
	      default:
		printk(KERN_ERR "iosapic_register_platform_irq(): invalid int type 0x%x\n", int_type);
		return -1;
	}

	register_intr(gsi, vector, delivery, polarity, trigger);

	printk(KERN_INFO "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n",
	       int_type < ARRAY_SIZE(name) ? name[int_type] : "unknown",
	       int_type, gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
	       (polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
	       cpu_logical_id(dest), dest, vector);

	set_rte(gsi, vector, dest, mask);
	return vector;
}


/*
 * ACPI calls this when it finds an entry for a legacy ISA IRQ override.
 * Note that the gsi_base and IOSAPIC address must be set in iosapic_init().
 */
void __init
iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
			  unsigned long polarity,
			  unsigned long trigger)
{
	int vector;
	unsigned int dest = cpu_physical_id(smp_processor_id());

	vector = isa_irq_to_vector(isa_irq);

	register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, polarity, trigger);

	DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n",
	    isa_irq, gsi, trigger == IOSAPIC_EDGE ? "edge" : "level",
	    polarity == IOSAPIC_POL_HIGH ? "high" : "low",
	    cpu_logical_id(dest), dest, vector);

	set_rte(gsi, vector, dest, 1);
}

void __init
iosapic_system_init (int system_pcat_compat)
{
	int vector;

	for (vector = 0; vector < IA64_NUM_VECTORS; ++vector) {
		iosapic_intr_info[vector].low32 = IOSAPIC_MASK;
		INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes);	/* mark as unused */
	}

	pcat_compat = system_pcat_compat;
	if (pcat_compat) {
		/*
		 * Disable the compatibility mode interrupts (8259 style), needs IN/OUT support
		 * enabled.
		 */
		printk(KERN_INFO "%s: Disabling PC-AT compatible 8259 interrupts\n", __FUNCTION__);
		outb(0xff, 0xA1);
		outb(0xff, 0x21);
	}
}

static inline int
iosapic_alloc (void)
{
	int index;

	for (index = 0; index < NR_IOSAPICS; index++)
		if (!iosapic_lists[index].addr)
			return index;

	printk(KERN_WARNING "%s: failed to allocate iosapic\n", __FUNCTION__);
	return -1;
}

static inline void
iosapic_free (int index)
{
	memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0]));
}

static inline int
iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver)
{
	int index;
	unsigned int gsi_end, base, end;

	/* check gsi range */
	gsi_end = gsi_base + ((ver >> 16) & 0xff);
	for (index = 0; index < NR_IOSAPICS; index++) {
		if (!iosapic_lists[index].addr)
			continue;

		base = iosapic_lists[index].gsi_base;
		end  = base + iosapic_lists[index].num_rte - 1;

		if (gsi_base < base && gsi_end < base)
			continue;/* OK */

		if (gsi_base > end && gsi_end > end)
			continue; /* OK */

		return -EBUSY;
	}
	return 0;
}

int __devinit
iosapic_init (unsigned long phys_addr, unsigned int gsi_base)
{
	int num_rte, err, index;
	unsigned int isa_irq, ver;
	char __iomem *addr;
	unsigned long flags;

	spin_lock_irqsave(&iosapic_lock, flags);
	{
		addr = ioremap(phys_addr, 0);
		ver = iosapic_version(addr);

		if ((err = iosapic_check_gsi_range(gsi_base, ver))) {
			iounmap(addr);
			spin_unlock_irqrestore(&iosapic_lock, flags);
			return err;
		}

		/*
		 * The MAX_REDIR register holds the highest input pin
		 * number (starting from 0).
		 * We add 1 so that we can use it for number of pins (= RTEs)
		 */
		num_rte = ((ver >> 16) & 0xff) + 1;

		index = iosapic_alloc();
		iosapic_lists[index].addr = addr;
		iosapic_lists[index].gsi_base = gsi_base;
		iosapic_lists[index].num_rte = num_rte;
#ifdef CONFIG_NUMA
		iosapic_lists[index].node = MAX_NUMNODES;
#endif
	}
	spin_unlock_irqrestore(&iosapic_lock, flags);

	if ((gsi_base == 0) && pcat_compat) {
		/*
		 * Map the legacy ISA devices into the IOSAPIC data.  Some of these may
		 * get reprogrammed later on with data from the ACPI Interrupt Source
		 * Override table.
		 */
		for (isa_irq = 0; isa_irq < 16; ++isa_irq)
			iosapic_override_isa_irq(isa_irq, isa_irq, IOSAPIC_POL_HIGH, IOSAPIC_EDGE);
	}
	return 0;
}

#ifdef CONFIG_HOTPLUG
int
iosapic_remove (unsigned int gsi_base)
{
	int index, err = 0;
	unsigned long flags;

	spin_lock_irqsave(&iosapic_lock, flags);
	{
		index = find_iosapic(gsi_base);
		if (index < 0) {
			printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n",
			       __FUNCTION__, gsi_base);
			goto out;
		}

		if (iosapic_lists[index].rtes_inuse) {
			err = -EBUSY;
			printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n",
			       __FUNCTION__, gsi_base);
			goto out;
		}

		iounmap(iosapic_lists[index].addr);
		iosapic_free(index);
	}
 out:
	spin_unlock_irqrestore(&iosapic_lock, flags);
	return err;
}
#endif /* CONFIG_HOTPLUG */

#ifdef CONFIG_NUMA
void __devinit
map_iosapic_to_node(unsigned int gsi_base, int node)
{
	int index;

	index = find_iosapic(gsi_base);
	if (index < 0) {
		printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n",
		       __FUNCTION__, gsi_base);
		return;
	}
	iosapic_lists[index].node = node;
	return;
}
#endif

static int __init iosapic_enable_kmalloc (void)
{
	iosapic_kmalloc_ok = 1;
	return 0;
}
core_initcall (iosapic_enable_kmalloc);