Commit 199751d7 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

x86: make 32 bit to use sparse_irq 



but actually irq still needs to be less than NR_IRQS, because
interrupt[NR_IRQS] in entry.S.

need to enable per_cpu vector...

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0f978f45

arch/x86/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ config X86 
	select HAVE_GENERIC_DMA_COHERENT if X86_32

	select HAVE_EFFICIENT_UNALIGNED_ACCESS

	select HAVE_DYN_ARRAY

	select HAVE_SPARSE_IRQ if X86_64

	select HAVE_SPARSE_IRQ



config ARCH_DEFCONFIG

	string

arch/x86/kernel/io_apic_32.c

+43 −20
Original line number Diff line number Diff line
@@ -595,7 +595,6 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask) 
	struct irq_pin_list *entry;

	unsigned int apicid_value;

	cpumask_t tmp;

	struct irq_desc *desc;





	cfg = irq_cfg(irq);
@@ -620,8 +619,7 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask) 
			break;

		entry = entry->next;

	}

	desc = irq_to_desc(irq);

	desc->affinity = cpumask;

	irq_to_desc(irq)->affinity = cpumask;

	spin_unlock_irqrestore(&ioapic_lock, flags);

}
@@ -1055,8 +1053,6 @@ static int __assign_irq_vector(int irq) 
	int vector, offset;

	struct irq_cfg *cfg;



	BUG_ON((unsigned)irq >= nr_irqs);



	cfg = irq_cfg(irq);

	if (cfg->vector > 0)

		return cfg->vector;
@@ -1103,7 +1099,12 @@ static void ioapic_register_intr(int irq, int vector, unsigned long trigger) 
{

	struct irq_desc *desc;



	/* first time to use this irq_desc */

	if (irq < 16)

		desc = irq_to_desc(irq);

	else

		desc = irq_to_desc_alloc(irq);



	if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||

	    trigger == IOAPIC_LEVEL) {

		desc->status |= IRQ_LEVEL;
@@ -2330,16 +2331,19 @@ device_initcall(ioapic_init_sysfs); 
/*

 * Dynamic irq allocate and deallocation

 */

int create_irq(void)

unsigned int create_irq_nr(unsigned int irq_want)

{

	/* Allocate an unused irq */

	int irq, new, vector = 0;

	unsigned int irq, new, vector = 0;

	unsigned long flags;

	struct irq_cfg *cfg_new;



	irq = -ENOSPC;

	/* only can use bus/dev/fn.. when per_cpu vector is used */

	irq_want = nr_irqs - 1;



	irq = 0;

	spin_lock_irqsave(&vector_lock, flags);

	for (new = (nr_irqs - 1); new >= 0; new--) {

	for (new = (nr_irqs - 1); new > 0; new--) {

		if (platform_legacy_irq(new))

			continue;

		cfg_new = irq_cfg(new);
@@ -2354,13 +2358,18 @@ int create_irq(void) 
	}

	spin_unlock_irqrestore(&vector_lock, flags);



	if (irq >= 0) {

	if (irq > 0) {

		set_intr_gate(vector, interrupt[irq]);

		dynamic_irq_init(irq);

	}

	return irq;

}



int create_irq(void)

{

	return create_irq_nr(nr_irqs - 1);

}



void destroy_irq(unsigned int irq)

{

	unsigned long flags;
@@ -2415,7 +2424,6 @@ static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask) 
	unsigned int dest;

	cpumask_t tmp;

	int vector;

	struct irq_desc *desc;



	cpus_and(tmp, mask, cpu_online_map);

	if (cpus_empty(tmp))
@@ -2435,8 +2443,7 @@ static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask) 
	msg.address_lo |= MSI_ADDR_DEST_ID(dest);



	write_msi_msg(irq, &msg);

	desc = irq_to_desc(irq);

	desc->affinity = mask;

	irq_to_desc(irq)->affinity = mask;

}

#endif /* CONFIG_SMP */
@@ -2455,13 +2462,31 @@ static struct irq_chip msi_chip = { 
	.retrigger	= ioapic_retrigger_irq,

};



static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)

{

	unsigned int irq;



	irq = dev->bus->number;

	irq <<= 8;

	irq |= dev->devfn;

	irq <<= 12;



	return irq;

}



int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)

{

	struct msi_msg msg;

	int irq, ret;

	irq = create_irq();

	if (irq < 0)

		return irq;



	unsigned int irq_want;



	irq_want = build_irq_for_pci_dev(dev) + 0x100;



	irq = create_irq_nr(irq_want);



	if (irq == 0)

		return -1;



	ret = msi_compose_msg(dev, irq, &msg);

	if (ret < 0) {
@@ -2510,7 +2535,6 @@ static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask) 
{

	unsigned int dest;

	cpumask_t tmp;

	struct irq_desc *desc;



	cpus_and(tmp, mask, cpu_online_map);

	if (cpus_empty(tmp))
@@ -2521,8 +2545,7 @@ static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask) 
	dest = cpu_mask_to_apicid(mask);



	target_ht_irq(irq, dest);

	desc = irq_to_desc(irq);

	desc->affinity = mask;

	irq_to_desc(irq)->affinity = mask;

}

#endif

arch/x86/kernel/irq_32.c

+28 −9
Original line number Diff line number Diff line
@@ -224,9 +224,10 @@ unsigned int do_IRQ(struct pt_regs *regs) 
	struct pt_regs *old_regs;

	/* high bit used in ret_from_ code */

	int overflow, irq = ~regs->orig_ax;

	struct irq_desc *desc = irq_to_desc(irq);

	struct irq_desc *desc;



	if (unlikely((unsigned)irq >= nr_irqs)) {

	desc = irq_to_desc(irq);

	if (unlikely(!desc)) {

		printk(KERN_EMERG "%s: cannot handle IRQ %d\n",

					__func__, irq);

		BUG();
@@ -263,6 +264,24 @@ int show_interrupts(struct seq_file *p, void *v) 
	int i = *(loff_t *) v, j;

	struct irqaction * action;

	unsigned long flags;

	unsigned int entries;

	struct irq_desc *desc;

	int tail = 0;



#ifdef CONFIG_HAVE_SPARSE_IRQ

	desc = (struct irq_desc *)v;

	entries = -1U;

	i = desc->irq;

	if (!desc->next)

		tail = 1;

#else

	entries = nr_irqs - 1;

	i = *(loff_t *) v;

	if (i == nr_irqs)

		tail = 1;

	else

		desc = irq_to_desc(i);

#endif



	if (i == 0) {

		seq_printf(p, "           ");
@@ -271,9 +290,8 @@ int show_interrupts(struct seq_file *p, void *v) 
		seq_putc(p, '\n');

	}



	if (i < nr_irqs) {

	if (i <= entries) {

		unsigned any_count = 0;

		struct irq_desc *desc = irq_to_desc(i);



		spin_lock_irqsave(&desc->lock, flags);

#ifndef CONFIG_SMP
@@ -285,7 +303,7 @@ int show_interrupts(struct seq_file *p, void *v) 
		action = desc->action;

		if (!action && !any_count)

			goto skip;

		seq_printf(p, "%3d: ",i);

		seq_printf(p, "%#x: ",i);

#ifndef CONFIG_SMP

		seq_printf(p, "%10u ", kstat_irqs(i));

#else
@@ -304,7 +322,9 @@ int show_interrupts(struct seq_file *p, void *v) 
		seq_putc(p, '\n');

skip:

		spin_unlock_irqrestore(&desc->lock, flags);

	} else if (i == nr_irqs) {

	}



	if (tail) {

		seq_printf(p, "NMI: ");

		for_each_online_cpu(j)

			seq_printf(p, "%10u ", nmi_count(j));
@@ -396,15 +416,14 @@ void fixup_irqs(cpumask_t map) 
{

	unsigned int irq;

	static int warned;

	struct irq_desc *desc;



	for (irq = 0; irq < nr_irqs; irq++) {

	for_each_irq_desc(irq, desc) {

		cpumask_t mask;

		struct irq_desc *desc;



		if (irq == 2)

			continue;



		desc = irq_to_desc(irq);

		cpus_and(mask, desc->affinity, map);

		if (any_online_cpu(mask) == NR_CPUS) {

			printk("Breaking affinity for irq %i\n", irq);

arch/x86/kernel/irqinit_32.c

+7 −0
Original line number Diff line number Diff line
@@ -69,6 +69,13 @@ void __init init_ISA_irqs (void) 
	 * 16 old-style INTA-cycle interrupts:

	 */

	for (i = 0; i < 16; i++) {

		/* first time call this irq_desc */

		struct irq_desc *desc = irq_to_desc_alloc(i);



		desc->status = IRQ_DISABLED;

		desc->action = NULL;

		desc->depth = 1;



		set_irq_chip_and_handler_name(i, &i8259A_chip,

					      handle_level_irq, "XT");

	}

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