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Commit cd378f18 authored by Yasuaki Ishimatsu's avatar Yasuaki Ishimatsu Committed by Tony Luck
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[IA64] Support irq migration across domain 



Add support for IRQ migration across vector domain.

Signed-off-by: default avatarKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 4994be1b

arch/ia64/kernel/iosapic.c

+17 −3
Original line number Diff line number Diff line
@@ -354,11 +354,13 @@ iosapic_set_affinity (unsigned int irq, cpumask_t mask) 


	irq &= (~IA64_IRQ_REDIRECTED);



	/* IRQ migration across domain is not supported yet */

	cpus_and(mask, mask, irq_to_domain(irq));

	cpus_and(mask, mask, cpu_online_map);

	if (cpus_empty(mask))

		return;



	if (reassign_irq_vector(irq, first_cpu(mask)))

		return;



	dest = cpu_physical_id(first_cpu(mask));



	if (list_empty(&iosapic_intr_info[irq].rtes))
@@ -376,6 +378,8 @@ iosapic_set_affinity (unsigned int irq, cpumask_t mask) 
	else

		/* change delivery mode to fixed */

		low32 |= (IOSAPIC_FIXED << IOSAPIC_DELIVERY_SHIFT);

	low32 &= IOSAPIC_VECTOR_MASK;

	low32 |= irq_to_vector(irq);



	iosapic_intr_info[irq].low32 = low32;

	iosapic_intr_info[irq].dest = dest;
@@ -404,10 +408,20 @@ iosapic_end_level_irq (unsigned int irq) 
{

	ia64_vector vec = irq_to_vector(irq);

	struct iosapic_rte_info *rte;

	int do_unmask_irq = 0;



	if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {

		do_unmask_irq = 1;

		mask_irq(irq);

	}



	move_native_irq(irq);

	list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list)

		iosapic_eoi(rte->iosapic->addr, vec);



	if (unlikely(do_unmask_irq)) {

		move_masked_irq(irq);

		unmask_irq(irq);

	}

}



#define iosapic_shutdown_level_irq	mask_irq

arch/ia64/kernel/irq_ia64.c

+39 −3
Original line number Diff line number Diff line
@@ -172,15 +172,13 @@ int bind_irq_vector(int irq, int vector, cpumask_t domain) 
	return ret;

}



static void clear_irq_vector(int irq)

static void __clear_irq_vector(int irq)

{

	unsigned long flags;

	int vector, cpu, pos;

	cpumask_t mask;

	cpumask_t domain;

	struct irq_cfg *cfg = &irq_cfg[irq];



	spin_lock_irqsave(&vector_lock, flags);

	BUG_ON((unsigned)irq >= NR_IRQS);

	BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);

	vector = cfg->vector;
@@ -193,6 +191,14 @@ static void clear_irq_vector(int irq) 
	irq_status[irq] = IRQ_UNUSED;

	pos = vector - IA64_FIRST_DEVICE_VECTOR;

	cpus_andnot(vector_table[pos], vector_table[pos], domain);

}



static void clear_irq_vector(int irq)

{

	unsigned long flags;



	spin_lock_irqsave(&vector_lock, flags);

	__clear_irq_vector(irq);

	spin_unlock_irqrestore(&vector_lock, flags);

}
@@ -275,6 +281,36 @@ void destroy_and_reserve_irq(unsigned int irq) 
	reserve_irq(irq);

}



static int __reassign_irq_vector(int irq, int cpu)

{

	struct irq_cfg *cfg = &irq_cfg[irq];

	int vector;

	cpumask_t domain;



	if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))

		return -EINVAL;

	if (cpu_isset(cpu, cfg->domain))

		return 0;

	domain = vector_allocation_domain(cpu);

	vector = find_unassigned_vector(domain);

	if (vector < 0)

		return -ENOSPC;

	__clear_irq_vector(irq);

	BUG_ON(__bind_irq_vector(irq, vector, domain));

	return 0;

}



int reassign_irq_vector(int irq, int cpu)

{

	unsigned long flags;

	int ret;



	spin_lock_irqsave(&vector_lock, flags);

	ret = __reassign_irq_vector(irq, cpu);

	spin_unlock_irqrestore(&vector_lock, flags);

	return ret;

}



/*

 * Dynamic irq allocate and deallocation for MSI

 */

arch/ia64/kernel/msi_ia64.c

+14 −6
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 


#define MSI_DATA_VECTOR_SHIFT		0

#define	    MSI_DATA_VECTOR(v)		(((u8)v) << MSI_DATA_VECTOR_SHIFT)

#define MSI_DATA_VECTOR_MASK		0xffffff00



#define MSI_DATA_DELIVERY_SHIFT		8

#define     MSI_DATA_DELIVERY_FIXED	(0 << MSI_DATA_DELIVERY_SHIFT)
@@ -50,22 +51,29 @@ static struct irq_chip ia64_msi_chip; 
static void ia64_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)

{

	struct msi_msg msg;

	u32 addr;

	u32 addr, data;

	int cpu = first_cpu(cpu_mask);



	/* IRQ migration across domain is not supported yet */

	cpus_and(cpu_mask, cpu_mask, irq_to_domain(irq));

	if (cpus_empty(cpu_mask))

	if (!cpu_online(cpu))

		return;



	if (reassign_irq_vector(irq, cpu))

		return;



	read_msi_msg(irq, &msg);



	addr = msg.address_lo;

	addr &= MSI_ADDR_DESTID_MASK;

	addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(first_cpu(cpu_mask)));

	addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(cpu));

	msg.address_lo = addr;



	data = msg.data;

	data &= MSI_DATA_VECTOR_MASK;

	data |= MSI_DATA_VECTOR(irq_to_vector(irq));

	msg.data = data;



	write_msi_msg(irq, &msg);

	irq_desc[irq].affinity = cpu_mask;

	irq_desc[irq].affinity = cpumask_of_cpu(cpu);

}

#endif /* CONFIG_SMP */

include/asm-ia64/hw_irq.h

+1 −0
Original line number Diff line number Diff line
@@ -106,6 +106,7 @@ extern int assign_irq_vector (int irq); /* allocate a free vector */ 
extern void free_irq_vector (int vector);

extern int reserve_irq_vector (int vector);

extern void __setup_vector_irq(int cpu);

extern int reassign_irq_vector(int irq, int cpu);

extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect);

extern void register_percpu_irq (ia64_vector vec, struct irqaction *action);

extern int check_irq_used (int irq);

include/asm-ia64/iosapic.h

+2 −0
Original line number Diff line number Diff line
@@ -47,6 +47,8 @@ 
#define	IOSAPIC_MASK_SHIFT		16

#define	IOSAPIC_MASK			(1<<IOSAPIC_MASK_SHIFT)



#define IOSAPIC_VECTOR_MASK		0xffffff00



#ifndef __ASSEMBLY__



#ifdef CONFIG_IOSAPIC