[deliverable/linux.git] / arch / ia64 / sn / kernel / irq.c

/*
 * Platform dependent support for SGI SN
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2000-2006 Silicon Graphics, Inc.  All Rights Reserved.
 */

#include <linux/irq.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <asm/sn/addrs.h>
#include <asm/sn/arch.h>
#include <asm/sn/intr.h>
#include <asm/sn/pcibr_provider.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/shub_mmr.h>
#include <asm/sn/sn_sal.h>

static void force_interrupt(int irq);
static void register_intr_pda(struct sn_irq_info *sn_irq_info);
static void unregister_intr_pda(struct sn_irq_info *sn_irq_info);

int sn_force_interrupt_flag = 1;
extern int sn_ioif_inited;
static struct list_head **sn_irq_lh;
static spinlock_t sn_irq_info_lock = SPIN_LOCK_UNLOCKED; /* non-IRQ lock */

static inline u64 sn_intr_alloc(nasid_t local_nasid, int local_widget,
				     u64 sn_irq_info,
				     int req_irq, nasid_t req_nasid,
				     int req_slice)
{
	struct ia64_sal_retval ret_stuff;
	ret_stuff.status = 0;
	ret_stuff.v0 = 0;

	SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
			(u64) SAL_INTR_ALLOC, (u64) local_nasid,
			(u64) local_widget, (u64) sn_irq_info, (u64) req_irq,
			(u64) req_nasid, (u64) req_slice);
	return ret_stuff.status;
}

static inline void sn_intr_free(nasid_t local_nasid, int local_widget,
				struct sn_irq_info *sn_irq_info)
{
	struct ia64_sal_retval ret_stuff;
	ret_stuff.status = 0;
	ret_stuff.v0 = 0;

	SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
			(u64) SAL_INTR_FREE, (u64) local_nasid,
			(u64) local_widget, (u64) sn_irq_info->irq_irq,
			(u64) sn_irq_info->irq_cookie, 0, 0);
}

static unsigned int sn_startup_irq(unsigned int irq)
{
	return 0;
}

static void sn_shutdown_irq(unsigned int irq)
{
}

static void sn_disable_irq(unsigned int irq)
{
}

static void sn_enable_irq(unsigned int irq)
{
}

static void sn_ack_irq(unsigned int irq)
{
	u64 event_occurred, mask;

	irq = irq & 0xff;
	event_occurred = HUB_L((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED));
	mask = event_occurred & SH_ALL_INT_MASK;
	HUB_S((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS), mask);
	__set_bit(irq, (volatile void *)pda->sn_in_service_ivecs);

	move_native_irq(irq);
}

static void sn_end_irq(unsigned int irq)
{
	int ivec;
	u64 event_occurred;

	ivec = irq & 0xff;
	if (ivec == SGI_UART_VECTOR) {
		event_occurred = HUB_L((u64*)LOCAL_MMR_ADDR (SH_EVENT_OCCURRED));
		/* If the UART bit is set here, we may have received an
		 * interrupt from the UART that the driver missed.  To
		 * make sure, we IPI ourselves to force us to look again.
		 */
		if (event_occurred & SH_EVENT_OCCURRED_UART_INT_MASK) {
			platform_send_ipi(smp_processor_id(), SGI_UART_VECTOR,
					  IA64_IPI_DM_INT, 0);
		}
	}
	__clear_bit(ivec, (volatile void *)pda->sn_in_service_ivecs);
	if (sn_force_interrupt_flag)
		force_interrupt(irq);
}

static void sn_irq_info_free(struct rcu_head *head);

static void sn_set_affinity_irq(unsigned int irq, cpumask_t mask)
{
	struct sn_irq_info *sn_irq_info, *sn_irq_info_safe;
	int cpuid, cpuphys;

	cpuid = first_cpu(mask);
	cpuphys = cpu_physical_id(cpuid);

	list_for_each_entry_safe(sn_irq_info, sn_irq_info_safe,
				 sn_irq_lh[irq], list) {
		u64 bridge;
		int local_widget, status;
		nasid_t local_nasid;
		struct sn_irq_info *new_irq_info;
		struct sn_pcibus_provider *pci_provider;

		new_irq_info = kmalloc(sizeof(struct sn_irq_info), GFP_ATOMIC);
		if (new_irq_info == NULL)
			break;
		memcpy(new_irq_info, sn_irq_info, sizeof(struct sn_irq_info));

		bridge = (u64) new_irq_info->irq_bridge;
		if (!bridge) {
			kfree(new_irq_info);
			break; /* irq is not a device interrupt */
		}

		local_nasid = NASID_GET(bridge);

		if (local_nasid & 1)
			local_widget = TIO_SWIN_WIDGETNUM(bridge);
		else
			local_widget = SWIN_WIDGETNUM(bridge);

		/* Free the old PROM new_irq_info structure */
		sn_intr_free(local_nasid, local_widget, new_irq_info);
		/* Update kernels new_irq_info with new target info */
		unregister_intr_pda(new_irq_info);

		/* allocate a new PROM new_irq_info struct */
		status = sn_intr_alloc(local_nasid, local_widget,
				       __pa(new_irq_info), irq,
				       cpuid_to_nasid(cpuid),
				       cpuid_to_slice(cpuid));

		/* SAL call failed */
		if (status) {
			kfree(new_irq_info);
			break;
		}

		new_irq_info->irq_cpuid = cpuid;
		register_intr_pda(new_irq_info);

		pci_provider = sn_pci_provider[new_irq_info->irq_bridge_type];
		if (pci_provider && pci_provider->target_interrupt)
			(pci_provider->target_interrupt)(new_irq_info);

		spin_lock(&sn_irq_info_lock);
		list_replace_rcu(&sn_irq_info->list, &new_irq_info->list);
		spin_unlock(&sn_irq_info_lock);
		call_rcu(&sn_irq_info->rcu, sn_irq_info_free);

#ifdef CONFIG_SMP
		set_irq_affinity_info((irq & 0xff), cpuphys, 0);
#endif
	}
}

struct hw_interrupt_type irq_type_sn = {
	.typename	= "SN hub",
	.startup	= sn_startup_irq,
	.shutdown	= sn_shutdown_irq,
	.enable		= sn_enable_irq,
	.disable	= sn_disable_irq,
	.ack		= sn_ack_irq,
	.end		= sn_end_irq,
	.set_affinity	= sn_set_affinity_irq
};

unsigned int sn_local_vector_to_irq(u8 vector)
{
	return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));
}

void sn_irq_init(void)
{
	int i;
	irq_desc_t *base_desc = irq_desc;

	for (i = 0; i < NR_IRQS; i++) {
		if (base_desc[i].handler == &no_irq_type) {
			base_desc[i].handler = &irq_type_sn;
		}
	}
}

static void register_intr_pda(struct sn_irq_info *sn_irq_info)
{
	int irq = sn_irq_info->irq_irq;
	int cpu = sn_irq_info->irq_cpuid;

	if (pdacpu(cpu)->sn_last_irq < irq) {
		pdacpu(cpu)->sn_last_irq = irq;
	}

	if (pdacpu(cpu)->sn_first_irq == 0 || pdacpu(cpu)->sn_first_irq > irq)
		pdacpu(cpu)->sn_first_irq = irq;
}

static void unregister_intr_pda(struct sn_irq_info *sn_irq_info)
{
	int irq = sn_irq_info->irq_irq;
	int cpu = sn_irq_info->irq_cpuid;
	struct sn_irq_info *tmp_irq_info;
	int i, foundmatch;

	rcu_read_lock();
	if (pdacpu(cpu)->sn_last_irq == irq) {
		foundmatch = 0;
		for (i = pdacpu(cpu)->sn_last_irq - 1;
		     i && !foundmatch; i--) {
			list_for_each_entry_rcu(tmp_irq_info,
						sn_irq_lh[i],
						list) {
				if (tmp_irq_info->irq_cpuid == cpu) {
					foundmatch = 1;
					break;
				}
			}
		}
		pdacpu(cpu)->sn_last_irq = i;
	}

	if (pdacpu(cpu)->sn_first_irq == irq) {
		foundmatch = 0;
		for (i = pdacpu(cpu)->sn_first_irq + 1;
		     i < NR_IRQS && !foundmatch; i++) {
			list_for_each_entry_rcu(tmp_irq_info,
						sn_irq_lh[i],
						list) {
				if (tmp_irq_info->irq_cpuid == cpu) {
					foundmatch = 1;
					break;
				}
			}
		}
		pdacpu(cpu)->sn_first_irq = ((i == NR_IRQS) ? 0 : i);
	}
	rcu_read_unlock();
}

static void sn_irq_info_free(struct rcu_head *head)
{
	struct sn_irq_info *sn_irq_info;

	sn_irq_info = container_of(head, struct sn_irq_info, rcu);
	kfree(sn_irq_info);
}

void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
{
	nasid_t nasid = sn_irq_info->irq_nasid;
	int slice = sn_irq_info->irq_slice;
	int cpu = nasid_slice_to_cpuid(nasid, slice);

	pci_dev_get(pci_dev);
	sn_irq_info->irq_cpuid = cpu;
	sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);

	/* link it into the sn_irq[irq] list */
	spin_lock(&sn_irq_info_lock);
	list_add_rcu(&sn_irq_info->list, sn_irq_lh[sn_irq_info->irq_irq]);
	spin_unlock(&sn_irq_info_lock);

	register_intr_pda(sn_irq_info);
}

void sn_irq_unfixup(struct pci_dev *pci_dev)
{
	struct sn_irq_info *sn_irq_info;

	/* Only cleanup IRQ stuff if this device has a host bus context */
	if (!SN_PCIDEV_BUSSOFT(pci_dev))
		return;

	sn_irq_info = SN_PCIDEV_INFO(pci_dev)->pdi_sn_irq_info;
	if (!sn_irq_info || !sn_irq_info->irq_irq) {
		kfree(sn_irq_info);
		return;
	}

	unregister_intr_pda(sn_irq_info);
	spin_lock(&sn_irq_info_lock);
	list_del_rcu(&sn_irq_info->list);
	spin_unlock(&sn_irq_info_lock);
	call_rcu(&sn_irq_info->rcu, sn_irq_info_free);
	pci_dev_put(pci_dev);
}

static inline void
sn_call_force_intr_provider(struct sn_irq_info *sn_irq_info)
{
	struct sn_pcibus_provider *pci_provider;

	pci_provider = sn_pci_provider[sn_irq_info->irq_bridge_type];
	if (pci_provider && pci_provider->force_interrupt)
		(*pci_provider->force_interrupt)(sn_irq_info);
}

static void force_interrupt(int irq)
{
	struct sn_irq_info *sn_irq_info;

	if (!sn_ioif_inited)
		return;

	rcu_read_lock();
	list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[irq], list)
		sn_call_force_intr_provider(sn_irq_info);

	rcu_read_unlock();
}

/*
 * Check for lost interrupts.  If the PIC int_status reg. says that
 * an interrupt has been sent, but not handled, and the interrupt
 * is not pending in either the cpu irr regs or in the soft irr regs,
 * and the interrupt is not in service, then the interrupt may have
 * been lost.  Force an interrupt on that pin.  It is possible that
 * the interrupt is in flight, so we may generate a spurious interrupt,
 * but we should never miss a real lost interrupt.
 */
static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
{
	u64 regval;
	int irr_reg_num;
	int irr_bit;
	u64 irr_reg;
	struct pcidev_info *pcidev_info;
	struct pcibus_info *pcibus_info;

	/*
	 * Bridge types attached to TIO (anything but PIC) do not need this WAR
	 * since they do not target Shub II interrupt registers.  If that
	 * ever changes, this check needs to accomodate.
	 */
	if (sn_irq_info->irq_bridge_type != PCIIO_ASIC_TYPE_PIC)
		return;

	pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	if (!pcidev_info)
		return;

	pcibus_info =
	    (struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
	    pdi_pcibus_info;
	regval = pcireg_intr_status_get(pcibus_info);

	irr_reg_num = irq_to_vector(irq) / 64;
	irr_bit = irq_to_vector(irq) % 64;
	switch (irr_reg_num) {
	case 0:
		irr_reg = ia64_getreg(_IA64_REG_CR_IRR0);
		break;
	case 1:
		irr_reg = ia64_getreg(_IA64_REG_CR_IRR1);
		break;
	case 2:
		irr_reg = ia64_getreg(_IA64_REG_CR_IRR2);
		break;
	case 3:
		irr_reg = ia64_getreg(_IA64_REG_CR_IRR3);
		break;
	}
	if (!test_bit(irr_bit, &irr_reg)) {
		if (!test_bit(irq, pda->sn_in_service_ivecs)) {
			regval &= 0xff;
			if (sn_irq_info->irq_int_bit & regval &
			    sn_irq_info->irq_last_intr) {
				regval &= ~(sn_irq_info->irq_int_bit & regval);
				sn_call_force_intr_provider(sn_irq_info);
			}
		}
	}
	sn_irq_info->irq_last_intr = regval;
}

void sn_lb_int_war_check(void)
{
	struct sn_irq_info *sn_irq_info;
	int i;

	if (!sn_ioif_inited || pda->sn_first_irq == 0)
		return;

	rcu_read_lock();
	for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
		list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[i], list) {
			sn_check_intr(i, sn_irq_info);
		}
	}
	rcu_read_unlock();
}

void __init sn_irq_lh_init(void)
{
	int i;

	sn_irq_lh = kmalloc(sizeof(struct list_head *) * NR_IRQS, GFP_KERNEL);
	if (!sn_irq_lh)
		panic("SN PCI INIT: Failed to allocate memory for PCI init\n");

	for (i = 0; i < NR_IRQS; i++) {
		sn_irq_lh[i] = kmalloc(sizeof(struct list_head), GFP_KERNEL);
		if (!sn_irq_lh[i])
			panic("SN PCI INIT: Failed IRQ memory allocation\n");

		INIT_LIST_HEAD(sn_irq_lh[i]);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Platform dependent support for SGI SN
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
2fcc3db0	8	* Copyright (c) 2000-2006 Silicon Graphics, Inc. All Rights Reserved.
1da177e4 LT	9	*/
	10
	11	#include <linux/irq.h>
cb4cb2cb	12	#include <linux/spinlock.h>
2fcc3db0	13	#include <linux/init.h>
1da177e4 LT	14	#include <asm/sn/addrs.h>
1da177e4 LT	15	#include <asm/sn/arch.h>
c13cf371 PB	16	#include <asm/sn/intr.h>
c13cf371 PB	17	#include <asm/sn/pcibr_provider.h>
9b08ebd1 MM	18	#include <asm/sn/pcibus_provider_defs.h>
9b08ebd1 MM	19	#include <asm/sn/pcidev.h>
1da177e4 LT	20	#include <asm/sn/shub_mmr.h>
	21	#include <asm/sn/sn_sal.h>
	22
	23	static void force_interrupt(int irq);
	24	static void register_intr_pda(struct sn_irq_info *sn_irq_info);
	25	static void unregister_intr_pda(struct sn_irq_info *sn_irq_info);
	26
d0d59b98	27	int sn_force_interrupt_flag = 1;
1da177e4	28	extern int sn_ioif_inited;
cb4cb2cb PB	29	static struct list_head **sn_irq_lh;
cb4cb2cb PB	30	static spinlock_t sn_irq_info_lock = SPIN_LOCK_UNLOCKED; /* non-IRQ lock */
1da177e4	31
53493dcf	32	static inline u64 sn_intr_alloc(nasid_t local_nasid, int local_widget,
1da177e4 LT	33	u64 sn_irq_info,
	34	int req_irq, nasid_t req_nasid,
	35	int req_slice)
	36	{
	37	struct ia64_sal_retval ret_stuff;
	38	ret_stuff.status = 0;
	39	ret_stuff.v0 = 0;
	40
	41	SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
	42	(u64) SAL_INTR_ALLOC, (u64) local_nasid,
	43	(u64) local_widget, (u64) sn_irq_info, (u64) req_irq,
	44	(u64) req_nasid, (u64) req_slice);
	45	return ret_stuff.status;
	46	}
	47
	48	static inline void sn_intr_free(nasid_t local_nasid, int local_widget,
	49	struct sn_irq_info *sn_irq_info)
	50	{
	51	struct ia64_sal_retval ret_stuff;
	52	ret_stuff.status = 0;
	53	ret_stuff.v0 = 0;
	54
	55	SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
	56	(u64) SAL_INTR_FREE, (u64) local_nasid,
	57	(u64) local_widget, (u64) sn_irq_info->irq_irq,
	58	(u64) sn_irq_info->irq_cookie, 0, 0);
	59	}
	60
	61	static unsigned int sn_startup_irq(unsigned int irq)
	62	{
	63	return 0;
	64	}
	65
	66	static void sn_shutdown_irq(unsigned int irq)
	67	{
	68	}
	69
	70	static void sn_disable_irq(unsigned int irq)
	71	{
	72	}
	73
	74	static void sn_enable_irq(unsigned int irq)
	75	{
	76	}
	77
	78	static void sn_ack_irq(unsigned int irq)
	79	{
2fcc3db0	80	u64 event_occurred, mask;
1da177e4 LT	81
1da177e4 LT	82	irq = irq & 0xff;
2fcc3db0	83	event_occurred = HUB_L((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED));
be539c73	84	mask = event_occurred & SH_ALL_INT_MASK;
2fcc3db0	85	HUB_S((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS), mask);
1da177e4 LT	86	__set_bit(irq, (volatile void *)pda->sn_in_service_ivecs);
1da177e4 LT	87
689388bb	88	move_native_irq(irq);
1da177e4 LT	89	}
	90
	91	static void sn_end_irq(unsigned int irq)
	92	{
1da177e4	93	int ivec;
0aa2c72e	94	u64 event_occurred;
1da177e4 LT	95
	96	ivec = irq & 0xff;
	97	if (ivec == SGI_UART_VECTOR) {
0aa2c72e	98	event_occurred = HUB_L((u64*)LOCAL_MMR_ADDR (SH_EVENT_OCCURRED));
cb4cb2cb	99	/* If the UART bit is set here, we may have received an
1da177e4 LT	100	* interrupt from the UART that the driver missed. To
	101	* make sure, we IPI ourselves to force us to look again.
	102	*/
	103	if (event_occurred & SH_EVENT_OCCURRED_UART_INT_MASK) {
	104	platform_send_ipi(smp_processor_id(), SGI_UART_VECTOR,
	105	IA64_IPI_DM_INT, 0);
	106	}
	107	}
	108	__clear_bit(ivec, (volatile void *)pda->sn_in_service_ivecs);
	109	if (sn_force_interrupt_flag)
	110	force_interrupt(irq);
	111	}
	112
cb4cb2cb PB	113	static void sn_irq_info_free(struct rcu_head *head);
cb4cb2cb PB	114
1da177e4 LT	115	static void sn_set_affinity_irq(unsigned int irq, cpumask_t mask)
1da177e4 LT	116	{
cb4cb2cb	117	struct sn_irq_info sn_irq_info, sn_irq_info_safe;
1da177e4	118	int cpuid, cpuphys;
1da177e4 LT	119
	120	cpuid = first_cpu(mask);
	121	cpuphys = cpu_physical_id(cpuid);
1da177e4	122
cb4cb2cb PB	123	list_for_each_entry_safe(sn_irq_info, sn_irq_info_safe,
cb4cb2cb PB	124	sn_irq_lh[irq], list) {
53493dcf	125	u64 bridge;
cb4cb2cb PB	126	int local_widget, status;
	127	nasid_t local_nasid;
	128	struct sn_irq_info *new_irq_info;
8409668b	129	struct sn_pcibus_provider *pci_provider;
cb4cb2cb PB	130
	131	new_irq_info = kmalloc(sizeof(struct sn_irq_info), GFP_ATOMIC);
	132	if (new_irq_info == NULL)
	133	break;
	134	memcpy(new_irq_info, sn_irq_info, sizeof(struct sn_irq_info));
	135
53493dcf	136	bridge = (u64) new_irq_info->irq_bridge;
cb4cb2cb PB	137	if (!bridge) {
	138	kfree(new_irq_info);
	139	break; /* irq is not a device interrupt */
	140	}
1da177e4	141
cb4cb2cb	142	local_nasid = NASID_GET(bridge);
1da177e4 LT	143
	144	if (local_nasid & 1)
	145	local_widget = TIO_SWIN_WIDGETNUM(bridge);
	146	else
	147	local_widget = SWIN_WIDGETNUM(bridge);
	148
cb4cb2cb PB	149	/* Free the old PROM new_irq_info structure */
	150	sn_intr_free(local_nasid, local_widget, new_irq_info);
	151	/* Update kernels new_irq_info with new target info */
	152	unregister_intr_pda(new_irq_info);
1da177e4	153
cb4cb2cb	154	/* allocate a new PROM new_irq_info struct */
1da177e4	155	status = sn_intr_alloc(local_nasid, local_widget,
cb4cb2cb PB	156	__pa(new_irq_info), irq,
	157	cpuid_to_nasid(cpuid),
	158	cpuid_to_slice(cpuid));
	159
	160	/* SAL call failed */
	161	if (status) {
	162	kfree(new_irq_info);
	163	break;
	164	}
1da177e4	165
cb4cb2cb PB	166	new_irq_info->irq_cpuid = cpuid;
	167	register_intr_pda(new_irq_info);
	168
8409668b MM	169	pci_provider = sn_pci_provider[new_irq_info->irq_bridge_type];
	170	if (pci_provider && pci_provider->target_interrupt)
	171	(pci_provider->target_interrupt)(new_irq_info);
cb4cb2cb PB	172
	173	spin_lock(&sn_irq_info_lock);
	174	list_replace_rcu(&sn_irq_info->list, &new_irq_info->list);
	175	spin_unlock(&sn_irq_info_lock);
	176	call_rcu(&sn_irq_info->rcu, sn_irq_info_free);
1da177e4 LT	177
1da177e4 LT	178	#ifdef CONFIG_SMP
cb4cb2cb	179	set_irq_affinity_info((irq & 0xff), cpuphys, 0);
1da177e4	180	#endif
1da177e4	181	}
1da177e4 LT	182	}
	183
	184	struct hw_interrupt_type irq_type_sn = {
cb4cb2cb PB	185	.typename = "SN hub",
	186	.startup = sn_startup_irq,
	187	.shutdown = sn_shutdown_irq,
	188	.enable = sn_enable_irq,
	189	.disable = sn_disable_irq,
	190	.ack = sn_ack_irq,
	191	.end = sn_end_irq,
	192	.set_affinity = sn_set_affinity_irq
1da177e4 LT	193	};
	194
	195	unsigned int sn_local_vector_to_irq(u8 vector)
	196	{
	197	return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));
	198	}
	199
	200	void sn_irq_init(void)
	201	{
	202	int i;
	203	irq_desc_t *base_desc = irq_desc;
	204
	205	for (i = 0; i < NR_IRQS; i++) {
	206	if (base_desc[i].handler == &no_irq_type) {
	207	base_desc[i].handler = &irq_type_sn;
	208	}
	209	}
	210	}
	211
	212	static void register_intr_pda(struct sn_irq_info *sn_irq_info)
	213	{
	214	int irq = sn_irq_info->irq_irq;
	215	int cpu = sn_irq_info->irq_cpuid;
	216
	217	if (pdacpu(cpu)->sn_last_irq < irq) {
	218	pdacpu(cpu)->sn_last_irq = irq;
	219	}
	220
2fcc3db0	221	if (pdacpu(cpu)->sn_first_irq == 0 \|\| pdacpu(cpu)->sn_first_irq > irq)
1da177e4	222	pdacpu(cpu)->sn_first_irq = irq;
1da177e4 LT	223	}
	224
	225	static void unregister_intr_pda(struct sn_irq_info *sn_irq_info)
	226	{
	227	int irq = sn_irq_info->irq_irq;
	228	int cpu = sn_irq_info->irq_cpuid;
	229	struct sn_irq_info *tmp_irq_info;
	230	int i, foundmatch;
	231
cb4cb2cb	232	rcu_read_lock();
1da177e4 LT	233	if (pdacpu(cpu)->sn_last_irq == irq) {
1da177e4 LT	234	foundmatch = 0;
cb4cb2cb PB	235	for (i = pdacpu(cpu)->sn_last_irq - 1;
	236	i && !foundmatch; i--) {
	237	list_for_each_entry_rcu(tmp_irq_info,
	238	sn_irq_lh[i],
	239	list) {
1da177e4	240	if (tmp_irq_info->irq_cpuid == cpu) {
cb4cb2cb	241	foundmatch = 1;
1da177e4 LT	242	break;
1da177e4 LT	243	}
1da177e4 LT	244	}
	245	}
	246	pdacpu(cpu)->sn_last_irq = i;
	247	}
	248
	249	if (pdacpu(cpu)->sn_first_irq == irq) {
	250	foundmatch = 0;
cb4cb2cb PB	251	for (i = pdacpu(cpu)->sn_first_irq + 1;
	252	i < NR_IRQS && !foundmatch; i++) {
	253	list_for_each_entry_rcu(tmp_irq_info,
	254	sn_irq_lh[i],
	255	list) {
1da177e4	256	if (tmp_irq_info->irq_cpuid == cpu) {
cb4cb2cb	257	foundmatch = 1;
1da177e4 LT	258	break;
1da177e4 LT	259	}
1da177e4 LT	260	}
	261	}
	262	pdacpu(cpu)->sn_first_irq = ((i == NR_IRQS) ? 0 : i);
	263	}
cb4cb2cb	264	rcu_read_unlock();
1da177e4 LT	265	}
1da177e4 LT	266
cb4cb2cb	267	static void sn_irq_info_free(struct rcu_head *head)
1da177e4 LT	268	{
1da177e4 LT	269	struct sn_irq_info *sn_irq_info;
1da177e4	270
cb4cb2cb	271	sn_irq_info = container_of(head, struct sn_irq_info, rcu);
1da177e4 LT	272	kfree(sn_irq_info);
	273	}
	274
	275	void sn_irq_fixup(struct pci_dev pci_dev, struct sn_irq_info sn_irq_info)
	276	{
	277	nasid_t nasid = sn_irq_info->irq_nasid;
	278	int slice = sn_irq_info->irq_slice;
	279	int cpu = nasid_slice_to_cpuid(nasid, slice);
	280
cb4cb2cb	281	pci_dev_get(pci_dev);
1da177e4 LT	282	sn_irq_info->irq_cpuid = cpu;
	283	sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);
	284
	285	/* link it into the sn_irq[irq] list */
cb4cb2cb PB	286	spin_lock(&sn_irq_info_lock);
	287	list_add_rcu(&sn_irq_info->list, sn_irq_lh[sn_irq_info->irq_irq]);
	288	spin_unlock(&sn_irq_info_lock);
1da177e4	289
2fcc3db0	290	register_intr_pda(sn_irq_info);
1da177e4 LT	291	}
1da177e4 LT	292
cb4cb2cb PB	293	void sn_irq_unfixup(struct pci_dev *pci_dev)
	294	{
	295	struct sn_irq_info *sn_irq_info;
	296
	297	/* Only cleanup IRQ stuff if this device has a host bus context */
	298	if (!SN_PCIDEV_BUSSOFT(pci_dev))
	299	return;
	300
	301	sn_irq_info = SN_PCIDEV_INFO(pci_dev)->pdi_sn_irq_info;
6f354b01 PB	302	if (!sn_irq_info \|\| !sn_irq_info->irq_irq) {
6f354b01 PB	303	kfree(sn_irq_info);
cb4cb2cb	304	return;
6f354b01	305	}
cb4cb2cb PB	306
	307	unregister_intr_pda(sn_irq_info);
	308	spin_lock(&sn_irq_info_lock);
	309	list_del_rcu(&sn_irq_info->list);
	310	spin_unlock(&sn_irq_info_lock);
	311	call_rcu(&sn_irq_info->rcu, sn_irq_info_free);
cb4cb2cb PB	312	pci_dev_put(pci_dev);
	313	}
	314
735e60f4 MM	315	static inline void
	316	sn_call_force_intr_provider(struct sn_irq_info *sn_irq_info)
	317	{
	318	struct sn_pcibus_provider *pci_provider;
	319
	320	pci_provider = sn_pci_provider[sn_irq_info->irq_bridge_type];
	321	if (pci_provider && pci_provider->force_interrupt)
	322	(*pci_provider->force_interrupt)(sn_irq_info);
	323	}
	324
1da177e4 LT	325	static void force_interrupt(int irq)
	326	{
	327	struct sn_irq_info *sn_irq_info;
	328
	329	if (!sn_ioif_inited)
	330	return;
cb4cb2cb PB	331
cb4cb2cb PB	332	rcu_read_lock();
735e60f4 MM	333	list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[irq], list)
	334	sn_call_force_intr_provider(sn_irq_info);
	335
cb4cb2cb	336	rcu_read_unlock();
1da177e4 LT	337	}
	338
	339	/*
	340	* Check for lost interrupts. If the PIC int_status reg. says that
	341	* an interrupt has been sent, but not handled, and the interrupt
	342	* is not pending in either the cpu irr regs or in the soft irr regs,
	343	* and the interrupt is not in service, then the interrupt may have
	344	* been lost. Force an interrupt on that pin. It is possible that
	345	* the interrupt is in flight, so we may generate a spurious interrupt,
	346	* but we should never miss a real lost interrupt.
	347	*/
	348	static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
	349	{
53493dcf	350	u64 regval;
1da177e4 LT	351	int irr_reg_num;
1da177e4 LT	352	int irr_bit;
53493dcf	353	u64 irr_reg;
1da177e4 LT	354	struct pcidev_info *pcidev_info;
	355	struct pcibus_info *pcibus_info;
	356
735e60f4 MM	357	/*
	358	* Bridge types attached to TIO (anything but PIC) do not need this WAR
	359	* since they do not target Shub II interrupt registers. If that
	360	* ever changes, this check needs to accomodate.
	361	*/
	362	if (sn_irq_info->irq_bridge_type != PCIIO_ASIC_TYPE_PIC)
	363	return;
	364
1da177e4 LT	365	pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	366	if (!pcidev_info)
	367	return;
	368
	369	pcibus_info =
	370	(struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
	371	pdi_pcibus_info;
	372	regval = pcireg_intr_status_get(pcibus_info);
	373
	374	irr_reg_num = irq_to_vector(irq) / 64;
	375	irr_bit = irq_to_vector(irq) % 64;
	376	switch (irr_reg_num) {
	377	case 0:
	378	irr_reg = ia64_getreg(_IA64_REG_CR_IRR0);
	379	break;
	380	case 1:
	381	irr_reg = ia64_getreg(_IA64_REG_CR_IRR1);
	382	break;
	383	case 2:
	384	irr_reg = ia64_getreg(_IA64_REG_CR_IRR2);
	385	break;
	386	case 3:
	387	irr_reg = ia64_getreg(_IA64_REG_CR_IRR3);
	388	break;
	389	}
	390	if (!test_bit(irr_bit, &irr_reg)) {
735e60f4 MM	391	if (!test_bit(irq, pda->sn_in_service_ivecs)) {
	392	regval &= 0xff;
	393	if (sn_irq_info->irq_int_bit & regval &
	394	sn_irq_info->irq_last_intr) {
	395	regval &= ~(sn_irq_info->irq_int_bit & regval);
	396	sn_call_force_intr_provider(sn_irq_info);
1da177e4 LT	397	}
	398	}
	399	}
	400	sn_irq_info->irq_last_intr = regval;
	401	}
	402
	403	void sn_lb_int_war_check(void)
	404	{
cb4cb2cb	405	struct sn_irq_info *sn_irq_info;
1da177e4 LT	406	int i;
	407
	408	if (!sn_ioif_inited \|\| pda->sn_first_irq == 0)
	409	return;
cb4cb2cb PB	410
cb4cb2cb PB	411	rcu_read_lock();
1da177e4	412	for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
cb4cb2cb	413	list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[i], list) {
735e60f4	414	sn_check_intr(i, sn_irq_info);
1da177e4 LT	415	}
1da177e4 LT	416	}
cb4cb2cb PB	417	rcu_read_unlock();
	418	}
	419
2fcc3db0	420	void __init sn_irq_lh_init(void)
cb4cb2cb PB	421	{
	422	int i;
	423
	424	sn_irq_lh = kmalloc(sizeof(struct list_head ) NR_IRQS, GFP_KERNEL);
	425	if (!sn_irq_lh)
	426	panic("SN PCI INIT: Failed to allocate memory for PCI init\n");
	427
	428	for (i = 0; i < NR_IRQS; i++) {
	429	sn_irq_lh[i] = kmalloc(sizeof(struct list_head), GFP_KERNEL);
	430	if (!sn_irq_lh[i])
	431	panic("SN PCI INIT: Failed IRQ memory allocation\n");
	432
	433	INIT_LIST_HEAD(sn_irq_lh[i]);
	434	}
1da177e4	435	}