Initial import

1 files changed, 1142 insertions, 0 deletions

diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c
new file mode 100644
index 000000000..4033c23bd
--- /dev/null
+++ b/arch/sparc/kernel/irq_64.c
@@ -0,0 +1,1142 @@
+/* irq.c: UltraSparc IRQ handling/init/registry.
+ *
+ * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1998  Eddie C. Dost    (ecd@skynet.be)
+ * Copyright (C) 1998  Jakub Jelinek    (jj@ultra.linux.cz)
+ */
+
+#include <linux/sched.h>
+#include <linux/linkage.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/kernel_stat.h>
+#include <linux/signal.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/ftrace.h>
+#include <linux/irq.h>
+#include <linux/kmemleak.h>
+
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <linux/atomic.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/iommu.h>
+#include <asm/upa.h>
+#include <asm/oplib.h>
+#include <asm/prom.h>
+#include <asm/timer.h>
+#include <asm/smp.h>
+#include <asm/starfire.h>
+#include <asm/uaccess.h>
+#include <asm/cache.h>
+#include <asm/cpudata.h>
+#include <asm/auxio.h>
+#include <asm/head.h>
+#include <asm/hypervisor.h>
+#include <asm/cacheflush.h>
+
+#include "entry.h"
+#include "cpumap.h"
+#include "kstack.h"
+
+struct ino_bucket *ivector_table;
+unsigned long ivector_table_pa;
+
+/* On several sun4u processors, it is illegal to mix bypass and
+ * non-bypass accesses.  Therefore we access all INO buckets
+ * using bypass accesses only.
+ */
+static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
+{
+	unsigned long ret;
+
+	__asm__ __volatile__("ldxa	[%1] %2, %0"
+			     : "=&r" (ret)
+			     : "r" (bucket_pa +
+				    offsetof(struct ino_bucket,
+					     __irq_chain_pa)),
+			       "i" (ASI_PHYS_USE_EC));
+
+	return ret;
+}
+
+static void bucket_clear_chain_pa(unsigned long bucket_pa)
+{
+	__asm__ __volatile__("stxa	%%g0, [%0] %1"
+			     : /* no outputs */
+			     : "r" (bucket_pa +
+				    offsetof(struct ino_bucket,
+					     __irq_chain_pa)),
+			       "i" (ASI_PHYS_USE_EC));
+}
+
+static unsigned int bucket_get_irq(unsigned long bucket_pa)
+{
+	unsigned int ret;
+
+	__asm__ __volatile__("lduwa	[%1] %2, %0"
+			     : "=&r" (ret)
+			     : "r" (bucket_pa +
+				    offsetof(struct ino_bucket,
+					     __irq)),
+			       "i" (ASI_PHYS_USE_EC));
+
+	return ret;
+}
+
+static void bucket_set_irq(unsigned long bucket_pa, unsigned int irq)
+{
+	__asm__ __volatile__("stwa	%0, [%1] %2"
+			     : /* no outputs */
+			     : "r" (irq),
+			       "r" (bucket_pa +
+				    offsetof(struct ino_bucket,
+					     __irq)),
+			       "i" (ASI_PHYS_USE_EC));
+}
+
+#define irq_work_pa(__cpu)	&(trap_block[(__cpu)].irq_worklist_pa)
+
+static unsigned long hvirq_major __initdata;
+static int __init early_hvirq_major(char *p)
+{
+	int rc = kstrtoul(p, 10, &hvirq_major);
+
+	return rc;
+}
+early_param("hvirq", early_hvirq_major);
+
+static int hv_irq_version;
+
+/* Major version 2.0 of HV_GRP_INTR added support for the VIRQ cookie
+ * based interfaces, but:
+ *
+ * 1) Several OSs, Solaris and Linux included, use them even when only
+ *    negotiating version 1.0 (or failing to negotiate at all).  So the
+ *    hypervisor has a workaround that provides the VIRQ interfaces even
+ *    when only verion 1.0 of the API is in use.
+ *
+ * 2) Second, and more importantly, with major version 2.0 these VIRQ
+ *    interfaces only were actually hooked up for LDC interrupts, even
+ *    though the Hypervisor specification clearly stated:
+ *
+ *	The new interrupt API functions will be available to a guest
+ *	when it negotiates version 2.0 in the interrupt API group 0x2. When
+ *	a guest negotiates version 2.0, all interrupt sources will only
+ *	support using the cookie interface, and any attempt to use the
+ *	version 1.0 interrupt APIs numbered 0xa0 to 0xa6 will result in the
+ *	ENOTSUPPORTED error being returned.
+ *
+ *   with an emphasis on "all interrupt sources".
+ *
+ * To correct this, major version 3.0 was created which does actually
+ * support VIRQs for all interrupt sources (not just LDC devices).  So
+ * if we want to move completely over the cookie based VIRQs we must
+ * negotiate major version 3.0 or later of HV_GRP_INTR.
+ */
+static bool sun4v_cookie_only_virqs(void)
+{
+	if (hv_irq_version >= 3)
+		return true;
+	return false;
+}
+
+static void __init irq_init_hv(void)
+{
+	unsigned long hv_error, major, minor = 0;
+
+	if (tlb_type != hypervisor)
+		return;
+
+	if (hvirq_major)
+		major = hvirq_major;
+	else
+		major = 3;
+
+	hv_error = sun4v_hvapi_register(HV_GRP_INTR, major, &minor);
+	if (!hv_error)
+		hv_irq_version = major;
+	else
+		hv_irq_version = 1;
+
+	pr_info("SUN4V: Using IRQ API major %d, cookie only virqs %s\n",
+		hv_irq_version,
+		sun4v_cookie_only_virqs() ? "enabled" : "disabled");
+}
+
+/* This function is for the timer interrupt.*/
+int __init arch_probe_nr_irqs(void)
+{
+	return 1;
+}
+
+#define DEFAULT_NUM_IVECS	(0xfffU)
+static unsigned int nr_ivec = DEFAULT_NUM_IVECS;
+#define NUM_IVECS (nr_ivec)
+
+static unsigned int __init size_nr_ivec(void)
+{
+	if (tlb_type == hypervisor) {
+		switch (sun4v_chip_type) {
+		/* Athena's devhandle|devino is large.*/
+		case SUN4V_CHIP_SPARC64X:
+			nr_ivec = 0xffff;
+			break;
+		}
+	}
+	return nr_ivec;
+}
+
+struct irq_handler_data {
+	union {
+		struct {
+			unsigned int dev_handle;
+			unsigned int dev_ino;
+		};
+		unsigned long sysino;
+	};
+	struct ino_bucket bucket;
+	unsigned long	iclr;
+	unsigned long	imap;
+};
+
+static inline unsigned int irq_data_to_handle(struct irq_data *data)
+{
+	struct irq_handler_data *ihd = data->handler_data;
+
+	return ihd->dev_handle;
+}
+
+static inline unsigned int irq_data_to_ino(struct irq_data *data)
+{
+	struct irq_handler_data *ihd = data->handler_data;
+
+	return ihd->dev_ino;
+}
+
+static inline unsigned long irq_data_to_sysino(struct irq_data *data)
+{
+	struct irq_handler_data *ihd = data->handler_data;
+
+	return ihd->sysino;
+}
+
+void irq_free(unsigned int irq)
+{
+	void *data = irq_get_handler_data(irq);
+
+	kfree(data);
+	irq_set_handler_data(irq, NULL);
+	irq_free_descs(irq, 1);
+}
+
+unsigned int irq_alloc(unsigned int dev_handle, unsigned int dev_ino)
+{
+	int irq;
+
+	irq = __irq_alloc_descs(-1, 1, 1, numa_node_id(), NULL);
+	if (irq <= 0)
+		goto out;
+
+	return irq;
+out:
+	return 0;
+}
+
+static unsigned int cookie_exists(u32 devhandle, unsigned int devino)
+{
+	unsigned long hv_err, cookie;
+	struct ino_bucket *bucket;
+	unsigned int irq = 0U;
+
+	hv_err = sun4v_vintr_get_cookie(devhandle, devino, &cookie);
+	if (hv_err) {
+		pr_err("HV get cookie failed hv_err = %ld\n", hv_err);
+		goto out;
+	}
+
+	if (cookie & ((1UL << 63UL))) {
+		cookie = ~cookie;
+		bucket = (struct ino_bucket *) __va(cookie);
+		irq = bucket->__irq;
+	}
+out:
+	return irq;
+}
+
+static unsigned int sysino_exists(u32 devhandle, unsigned int devino)
+{
+	unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino);
+	struct ino_bucket *bucket;
+	unsigned int irq;
+
+	bucket = &ivector_table[sysino];
+	irq = bucket_get_irq(__pa(bucket));
+
+	return irq;
+}
+
+void ack_bad_irq(unsigned int irq)
+{
+	pr_crit("BAD IRQ ack %d\n", irq);
+}
+
+void irq_install_pre_handler(int irq,
+			     void (*func)(unsigned int, void *, void *),
+			     void *arg1, void *arg2)
+{
+	pr_warn("IRQ pre handler NOT supported.\n");
+}
+
+/*
+ * /proc/interrupts printing:
+ */
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+	int j;
+
+	seq_printf(p, "NMI: ");
+	for_each_online_cpu(j)
+		seq_printf(p, "%10u ", cpu_data(j).__nmi_count);
+	seq_printf(p, "     Non-maskable interrupts\n");
+	return 0;
+}
+
+static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
+{
+	unsigned int tid;
+
+	if (this_is_starfire) {
+		tid = starfire_translate(imap, cpuid);
+		tid <<= IMAP_TID_SHIFT;
+		tid &= IMAP_TID_UPA;
+	} else {
+		if (tlb_type == cheetah || tlb_type == cheetah_plus) {
+			unsigned long ver;
+
+			__asm__ ("rdpr %%ver, %0" : "=r" (ver));
+			if ((ver >> 32UL) == __JALAPENO_ID ||
+			    (ver >> 32UL) == __SERRANO_ID) {
+				tid = cpuid << IMAP_TID_SHIFT;
+				tid &= IMAP_TID_JBUS;
+			} else {
+				unsigned int a = cpuid & 0x1f;
+				unsigned int n = (cpuid >> 5) & 0x1f;
+
+				tid = ((a << IMAP_AID_SHIFT) |
+				       (n << IMAP_NID_SHIFT));
+				tid &= (IMAP_AID_SAFARI |
+					IMAP_NID_SAFARI);
+			}
+		} else {
+			tid = cpuid << IMAP_TID_SHIFT;
+			tid &= IMAP_TID_UPA;
+		}
+	}
+
+	return tid;
+}
+
+#ifdef CONFIG_SMP
+static int irq_choose_cpu(unsigned int irq, const struct cpumask *affinity)
+{
+	cpumask_t mask;
+	int cpuid;
+
+	cpumask_copy(&mask, affinity);
+	if (cpumask_equal(&mask, cpu_online_mask)) {
+		cpuid = map_to_cpu(irq);
+	} else {
+		cpumask_t tmp;
+
+		cpumask_and(&tmp, cpu_online_mask, &mask);
+		cpuid = cpumask_empty(&tmp) ? map_to_cpu(irq) : cpumask_first(&tmp);
+	}
+
+	return cpuid;
+}
+#else
+#define irq_choose_cpu(irq, affinity)	\
+	real_hard_smp_processor_id()
+#endif
+
+static void sun4u_irq_enable(struct irq_data *data)
+{
+	struct irq_handler_data *handler_data = data->handler_data;
+
+	if (likely(handler_data)) {
+		unsigned long cpuid, imap, val;
+		unsigned int tid;
+
+		cpuid = irq_choose_cpu(data->irq, data->affinity);
+		imap = handler_data->imap;
+
+		tid = sun4u_compute_tid(imap, cpuid);
+
+		val = upa_readq(imap);
+		val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
+			 IMAP_AID_SAFARI | IMAP_NID_SAFARI);
+		val |= tid | IMAP_VALID;
+		upa_writeq(val, imap);
+		upa_writeq(ICLR_IDLE, handler_data->iclr);
+	}
+}
+
+static int sun4u_set_affinity(struct irq_data *data,
+			       const struct cpumask *mask, bool force)
+{
+	struct irq_handler_data *handler_data = data->handler_data;
+
+	if (likely(handler_data)) {
+		unsigned long cpuid, imap, val;
+		unsigned int tid;
+
+		cpuid = irq_choose_cpu(data->irq, mask);
+		imap = handler_data->imap;
+
+		tid = sun4u_compute_tid(imap, cpuid);
+
+		val = upa_readq(imap);
+		val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS |
+			 IMAP_AID_SAFARI | IMAP_NID_SAFARI);
+		val |= tid | IMAP_VALID;
+		upa_writeq(val, imap);
+		upa_writeq(ICLR_IDLE, handler_data->iclr);
+	}
+
+	return 0;
+}
+
+/* Don't do anything.  The desc->status check for IRQ_DISABLED in
+ * handler_irq() will skip the handler call and that will leave the
+ * interrupt in the sent state.  The next ->enable() call will hit the
+ * ICLR register to reset the state machine.
+ *
+ * This scheme is necessary, instead of clearing the Valid bit in the
+ * IMAP register, to handle the case of IMAP registers being shared by
+ * multiple INOs (and thus ICLR registers).  Since we use a different
+ * virtual IRQ for each shared IMAP instance, the generic code thinks
+ * there is only one user so it prematurely calls ->disable() on
+ * free_irq().
+ *
+ * We have to provide an explicit ->disable() method instead of using
+ * NULL to get the default.  The reason is that if the generic code
+ * sees that, it also hooks up a default ->shutdown method which
+ * invokes ->mask() which we do not want.  See irq_chip_set_defaults().
+ */
+static void sun4u_irq_disable(struct irq_data *data)
+{
+}
+
+static void sun4u_irq_eoi(struct irq_data *data)
+{
+	struct irq_handler_data *handler_data = data->handler_data;
+
+	if (likely(handler_data))
+		upa_writeq(ICLR_IDLE, handler_data->iclr);
+}
+
+static void sun4v_irq_enable(struct irq_data *data)
+{
+	unsigned long cpuid = irq_choose_cpu(data->irq, data->affinity);
+	unsigned int ino = irq_data_to_sysino(data);
+	int err;
+
+	err = sun4v_intr_settarget(ino, cpuid);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
+		       "err(%d)\n", ino, cpuid, err);
+	err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_intr_setstate(%x): "
+		       "err(%d)\n", ino, err);
+	err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n",
+		       ino, err);
+}
+
+static int sun4v_set_affinity(struct irq_data *data,
+			       const struct cpumask *mask, bool force)
+{
+	unsigned long cpuid = irq_choose_cpu(data->irq, mask);
+	unsigned int ino = irq_data_to_sysino(data);
+	int err;
+
+	err = sun4v_intr_settarget(ino, cpuid);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): "
+		       "err(%d)\n", ino, cpuid, err);
+
+	return 0;
+}
+
+static void sun4v_irq_disable(struct irq_data *data)
+{
+	unsigned int ino = irq_data_to_sysino(data);
+	int err;
+
+	err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_intr_setenabled(%x): "
+		       "err(%d)\n", ino, err);
+}
+
+static void sun4v_irq_eoi(struct irq_data *data)
+{
+	unsigned int ino = irq_data_to_sysino(data);
+	int err;
+
+	err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_intr_setstate(%x): "
+		       "err(%d)\n", ino, err);
+}
+
+static void sun4v_virq_enable(struct irq_data *data)
+{
+	unsigned long dev_handle = irq_data_to_handle(data);
+	unsigned long dev_ino = irq_data_to_ino(data);
+	unsigned long cpuid;
+	int err;
+
+	cpuid = irq_choose_cpu(data->irq, data->affinity);
+
+	err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
+		       "err(%d)\n",
+		       dev_handle, dev_ino, cpuid, err);
+	err = sun4v_vintr_set_state(dev_handle, dev_ino,
+				    HV_INTR_STATE_IDLE);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
+		       "HV_INTR_STATE_IDLE): err(%d)\n",
+		       dev_handle, dev_ino, err);
+	err = sun4v_vintr_set_valid(dev_handle, dev_ino,
+				    HV_INTR_ENABLED);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
+		       "HV_INTR_ENABLED): err(%d)\n",
+		       dev_handle, dev_ino, err);
+}
+
+static int sun4v_virt_set_affinity(struct irq_data *data,
+				    const struct cpumask *mask, bool force)
+{
+	unsigned long dev_handle = irq_data_to_handle(data);
+	unsigned long dev_ino = irq_data_to_ino(data);
+	unsigned long cpuid;
+	int err;
+
+	cpuid = irq_choose_cpu(data->irq, mask);
+
+	err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): "
+		       "err(%d)\n",
+		       dev_handle, dev_ino, cpuid, err);
+
+	return 0;
+}
+
+static void sun4v_virq_disable(struct irq_data *data)
+{
+	unsigned long dev_handle = irq_data_to_handle(data);
+	unsigned long dev_ino = irq_data_to_ino(data);
+	int err;
+
+
+	err = sun4v_vintr_set_valid(dev_handle, dev_ino,
+				    HV_INTR_DISABLED);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
+		       "HV_INTR_DISABLED): err(%d)\n",
+		       dev_handle, dev_ino, err);
+}
+
+static void sun4v_virq_eoi(struct irq_data *data)
+{
+	unsigned long dev_handle = irq_data_to_handle(data);
+	unsigned long dev_ino = irq_data_to_ino(data);
+	int err;
+
+	err = sun4v_vintr_set_state(dev_handle, dev_ino,
+				    HV_INTR_STATE_IDLE);
+	if (err != HV_EOK)
+		printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx,"
+		       "HV_INTR_STATE_IDLE): err(%d)\n",
+		       dev_handle, dev_ino, err);
+}
+
+static struct irq_chip sun4u_irq = {
+	.name			= "sun4u",
+	.irq_enable		= sun4u_irq_enable,
+	.irq_disable		= sun4u_irq_disable,
+	.irq_eoi		= sun4u_irq_eoi,
+	.irq_set_affinity	= sun4u_set_affinity,
+	.flags			= IRQCHIP_EOI_IF_HANDLED,
+};
+
+static struct irq_chip sun4v_irq = {
+	.name			= "sun4v",
+	.irq_enable		= sun4v_irq_enable,
+	.irq_disable		= sun4v_irq_disable,
+	.irq_eoi		= sun4v_irq_eoi,
+	.irq_set_affinity	= sun4v_set_affinity,
+	.flags			= IRQCHIP_EOI_IF_HANDLED,
+};
+
+static struct irq_chip sun4v_virq = {
+	.name			= "vsun4v",
+	.irq_enable		= sun4v_virq_enable,
+	.irq_disable		= sun4v_virq_disable,
+	.irq_eoi		= sun4v_virq_eoi,
+	.irq_set_affinity	= sun4v_virt_set_affinity,
+	.flags			= IRQCHIP_EOI_IF_HANDLED,
+};
+
+unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
+{
+	struct irq_handler_data *handler_data;
+	struct ino_bucket *bucket;
+	unsigned int irq;
+	int ino;
+
+	BUG_ON(tlb_type == hypervisor);
+
+	ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
+	bucket = &ivector_table[ino];
+	irq = bucket_get_irq(__pa(bucket));
+	if (!irq) {
+		irq = irq_alloc(0, ino);
+		bucket_set_irq(__pa(bucket), irq);
+		irq_set_chip_and_handler_name(irq, &sun4u_irq,
+					      handle_fasteoi_irq, "IVEC");
+	}
+
+	handler_data = irq_get_handler_data(irq);
+	if (unlikely(handler_data))
+		goto out;
+
+	handler_data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
+	if (unlikely(!handler_data)) {
+		prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
+		prom_halt();
+	}
+	irq_set_handler_data(irq, handler_data);
+
+	handler_data->imap  = imap;
+	handler_data->iclr  = iclr;
+
+out:
+	return irq;
+}
+
+static unsigned int sun4v_build_common(u32 devhandle, unsigned int devino,
+		void (*handler_data_init)(struct irq_handler_data *data,
+		u32 devhandle, unsigned int devino),
+		struct irq_chip *chip)
+{
+	struct irq_handler_data *data;
+	unsigned int irq;
+
+	irq = irq_alloc(devhandle, devino);
+	if (!irq)
+		goto out;
+
+	data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
+	if (unlikely(!data)) {
+		pr_err("IRQ handler data allocation failed.\n");
+		irq_free(irq);
+		irq = 0;
+		goto out;
+	}
+
+	irq_set_handler_data(irq, data);
+	handler_data_init(data, devhandle, devino);
+	irq_set_chip_and_handler_name(irq, chip, handle_fasteoi_irq, "IVEC");
+	data->imap = ~0UL;
+	data->iclr = ~0UL;
+out:
+	return irq;
+}
+
+static unsigned long cookie_assign(unsigned int irq, u32 devhandle,
+		unsigned int devino)
+{
+	struct irq_handler_data *ihd = irq_get_handler_data(irq);
+	unsigned long hv_error, cookie;
+
+	/* handler_irq needs to find the irq. cookie is seen signed in
+	 * sun4v_dev_mondo and treated as a non ivector_table delivery.
+	 */
+	ihd->bucket.__irq = irq;
+	cookie = ~__pa(&ihd->bucket);
+
+	hv_error = sun4v_vintr_set_cookie(devhandle, devino, cookie);
+	if (hv_error)
+		pr_err("HV vintr set cookie failed = %ld\n", hv_error);
+
+	return hv_error;
+}
+
+static void cookie_handler_data(struct irq_handler_data *data,
+				u32 devhandle, unsigned int devino)
+{
+	data->dev_handle = devhandle;
+	data->dev_ino = devino;
+}
+
+static unsigned int cookie_build_irq(u32 devhandle, unsigned int devino,
+				     struct irq_chip *chip)
+{
+	unsigned long hv_error;
+	unsigned int irq;
+
+	irq = sun4v_build_common(devhandle, devino, cookie_handler_data, chip);
+
+	hv_error = cookie_assign(irq, devhandle, devino);
+	if (hv_error) {
+		irq_free(irq);
+		irq = 0;
+	}
+
+	return irq;
+}
+
+static unsigned int sun4v_build_cookie(u32 devhandle, unsigned int devino)
+{
+	unsigned int irq;
+
+	irq = cookie_exists(devhandle, devino);
+	if (irq)
+		goto out;
+
+	irq = cookie_build_irq(devhandle, devino, &sun4v_virq);
+
+out:
+	return irq;
+}
+
+static void sysino_set_bucket(unsigned int irq)
+{
+	struct irq_handler_data *ihd = irq_get_handler_data(irq);
+	struct ino_bucket *bucket;
+	unsigned long sysino;
+
+	sysino = sun4v_devino_to_sysino(ihd->dev_handle, ihd->dev_ino);
+	BUG_ON(sysino >= nr_ivec);
+	bucket = &ivector_table[sysino];
+	bucket_set_irq(__pa(bucket), irq);
+}
+
+static void sysino_handler_data(struct irq_handler_data *data,
+				u32 devhandle, unsigned int devino)
+{
+	unsigned long sysino;
+
+	sysino = sun4v_devino_to_sysino(devhandle, devino);
+	data->sysino = sysino;
+}
+
+static unsigned int sysino_build_irq(u32 devhandle, unsigned int devino,
+				     struct irq_chip *chip)
+{
+	unsigned int irq;
+
+	irq = sun4v_build_common(devhandle, devino, sysino_handler_data, chip);
+	if (!irq)
+		goto out;
+
+	sysino_set_bucket(irq);
+out:
+	return irq;
+}
+
+static int sun4v_build_sysino(u32 devhandle, unsigned int devino)
+{
+	int irq;
+
+	irq = sysino_exists(devhandle, devino);
+	if (irq)
+		goto out;
+
+	irq = sysino_build_irq(devhandle, devino, &sun4v_irq);
+out:
+	return irq;
+}
+
+unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
+{
+	unsigned int irq;
+
+	if (sun4v_cookie_only_virqs())
+		irq = sun4v_build_cookie(devhandle, devino);
+	else
+		irq = sun4v_build_sysino(devhandle, devino);
+
+	return irq;
+}
+
+unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino)
+{
+	int irq;
+
+	irq = cookie_build_irq(devhandle, devino, &sun4v_virq);
+	if (!irq)
+		goto out;
+
+	/* This is borrowed from the original function.
+	 */
+	irq_set_status_flags(irq, IRQ_NOAUTOEN);
+
+out:
+	return irq;
+}
+
+void *hardirq_stack[NR_CPUS];
+void *softirq_stack[NR_CPUS];
+
+void __irq_entry handler_irq(int pil, struct pt_regs *regs)
+{
+	unsigned long pstate, bucket_pa;
+	struct pt_regs *old_regs;
+	void *orig_sp;
+
+	clear_softint(1 << pil);
+
+	old_regs = set_irq_regs(regs);
+	irq_enter();
+
+	/* Grab an atomic snapshot of the pending IVECs.  */
+	__asm__ __volatile__("rdpr	%%pstate, %0\n\t"
+			     "wrpr	%0, %3, %%pstate\n\t"
+			     "ldx	[%2], %1\n\t"
+			     "stx	%%g0, [%2]\n\t"
+			     "wrpr	%0, 0x0, %%pstate\n\t"
+			     : "=&r" (pstate), "=&r" (bucket_pa)
+			     : "r" (irq_work_pa(smp_processor_id())),
+			       "i" (PSTATE_IE)
+			     : "memory");
+
+	orig_sp = set_hardirq_stack();
+
+	while (bucket_pa) {
+		unsigned long next_pa;
+		unsigned int irq;
+
+		next_pa = bucket_get_chain_pa(bucket_pa);
+		irq = bucket_get_irq(bucket_pa);
+		bucket_clear_chain_pa(bucket_pa);
+
+		generic_handle_irq(irq);
+
+		bucket_pa = next_pa;
+	}
+
+	restore_hardirq_stack(orig_sp);
+
+	irq_exit();
+	set_irq_regs(old_regs);
+}
+
+void do_softirq_own_stack(void)
+{
+	void *orig_sp, *sp = softirq_stack[smp_processor_id()];
+
+	sp += THREAD_SIZE - 192 - STACK_BIAS;
+
+	__asm__ __volatile__("mov %%sp, %0\n\t"
+			     "mov %1, %%sp"
+			     : "=&r" (orig_sp)
+			     : "r" (sp));
+	__do_softirq();
+	__asm__ __volatile__("mov %0, %%sp"
+			     : : "r" (orig_sp));
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void fixup_irqs(void)
+{
+	unsigned int irq;
+
+	for (irq = 0; irq < NR_IRQS; irq++) {
+		struct irq_desc *desc = irq_to_desc(irq);
+		struct irq_data *data;
+		unsigned long flags;
+
+		if (!desc)
+			continue;
+		data = irq_desc_get_irq_data(desc);
+		raw_spin_lock_irqsave(&desc->lock, flags);
+		if (desc->action && !irqd_is_per_cpu(data)) {
+			if (data->chip->irq_set_affinity)
+				data->chip->irq_set_affinity(data,
+							     data->affinity,
+							     false);
+		}
+		raw_spin_unlock_irqrestore(&desc->lock, flags);
+	}
+
+	tick_ops->disable_irq();
+}
+#endif
+
+struct sun5_timer {
+	u64	count0;
+	u64	limit0;
+	u64	count1;
+	u64	limit1;
+};
+
+static struct sun5_timer *prom_timers;
+static u64 prom_limit0, prom_limit1;
+
+static void map_prom_timers(void)
+{
+	struct device_node *dp;
+	const unsigned int *addr;
+
+	/* PROM timer node hangs out in the top level of device siblings... */
+	dp = of_find_node_by_path("/");
+	dp = dp->child;
+	while (dp) {
+		if (!strcmp(dp->name, "counter-timer"))
+			break;
+		dp = dp->sibling;
+	}
+
+	/* Assume if node is not present, PROM uses different tick mechanism
+	 * which we should not care about.
+	 */
+	if (!dp) {
+		prom_timers = (struct sun5_timer *) 0;
+		return;
+	}
+
+	/* If PROM is really using this, it must be mapped by him. */
+	addr = of_get_property(dp, "address", NULL);
+	if (!addr) {
+		prom_printf("PROM does not have timer mapped, trying to continue.\n");
+		prom_timers = (struct sun5_timer *) 0;
+		return;
+	}
+	prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
+}
+
+static void kill_prom_timer(void)
+{
+	if (!prom_timers)
+		return;
+
+	/* Save them away for later. */
+	prom_limit0 = prom_timers->limit0;
+	prom_limit1 = prom_timers->limit1;
+
+	/* Just as in sun4c PROM uses timer which ticks at IRQ 14.
+	 * We turn both off here just to be paranoid.
+	 */
+	prom_timers->limit0 = 0;
+	prom_timers->limit1 = 0;
+
+	/* Wheee, eat the interrupt packet too... */
+	__asm__ __volatile__(
+"	mov	0x40, %%g2\n"
+"	ldxa	[%%g0] %0, %%g1\n"
+"	ldxa	[%%g2] %1, %%g1\n"
+"	stxa	%%g0, [%%g0] %0\n"
+"	membar	#Sync\n"
+	: /* no outputs */
+	: "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
+	: "g1", "g2");
+}
+
+void notrace init_irqwork_curcpu(void)
+{
+	int cpu = hard_smp_processor_id();
+
+	trap_block[cpu].irq_worklist_pa = 0UL;
+}
+
+/* Please be very careful with register_one_mondo() and
+ * sun4v_register_mondo_queues().
+ *
+ * On SMP this gets invoked from the CPU trampoline before
+ * the cpu has fully taken over the trap table from OBP,
+ * and it's kernel stack + %g6 thread register state is
+ * not fully cooked yet.
+ *
+ * Therefore you cannot make any OBP calls, not even prom_printf,
+ * from these two routines.
+ */
+static void notrace register_one_mondo(unsigned long paddr, unsigned long type,
+				       unsigned long qmask)
+{
+	unsigned long num_entries = (qmask + 1) / 64;
+	unsigned long status;
+
+	status = sun4v_cpu_qconf(type, paddr, num_entries);
+	if (status != HV_EOK) {
+		prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
+			    "err %lu\n", type, paddr, num_entries, status);
+		prom_halt();
+	}
+}
+
+void notrace sun4v_register_mondo_queues(int this_cpu)
+{
+	struct trap_per_cpu *tb = &trap_block[this_cpu];
+
+	register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO,
+			   tb->cpu_mondo_qmask);
+	register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO,
+			   tb->dev_mondo_qmask);
+	register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR,
+			   tb->resum_qmask);
+	register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR,
+			   tb->nonresum_qmask);
+}
+
+/* Each queue region must be a power of 2 multiple of 64 bytes in
+ * size.  The base real address must be aligned to the size of the
+ * region.  Thus, an 8KB queue must be 8KB aligned, for example.
+ */
+static void __init alloc_one_queue(unsigned long *pa_ptr, unsigned long qmask)
+{
+	unsigned long size = PAGE_ALIGN(qmask + 1);
+	unsigned long order = get_order(size);
+	unsigned long p;
+
+	p = __get_free_pages(GFP_KERNEL, order);
+	if (!p) {
+		prom_printf("SUN4V: Error, cannot allocate queue.\n");
+		prom_halt();
+	}
+
+	*pa_ptr = __pa(p);
+}
+
+static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb)
+{
+#ifdef CONFIG_SMP
+	unsigned long page;
+
+	BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
+
+	page = get_zeroed_page(GFP_KERNEL);
+	if (!page) {
+		prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
+		prom_halt();
+	}
+
+	tb->cpu_mondo_block_pa = __pa(page);
+	tb->cpu_list_pa = __pa(page + 64);
+#endif
+}
+
+/* Allocate mondo and error queues for all possible cpus.  */
+static void __init sun4v_init_mondo_queues(void)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		struct trap_per_cpu *tb = &trap_block[cpu];
+
+		alloc_one_queue(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask);
+		alloc_one_queue(&tb->dev_mondo_pa, tb->dev_mondo_qmask);
+		alloc_one_queue(&tb->resum_mondo_pa, tb->resum_qmask);
+		alloc_one_queue(&tb->resum_kernel_buf_pa, tb->resum_qmask);
+		alloc_one_queue(&tb->nonresum_mondo_pa, tb->nonresum_qmask);
+		alloc_one_queue(&tb->nonresum_kernel_buf_pa,
+				tb->nonresum_qmask);
+	}
+}
+
+static void __init init_send_mondo_info(void)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		struct trap_per_cpu *tb = &trap_block[cpu];
+
+		init_cpu_send_mondo_info(tb);
+	}
+}
+
+static struct irqaction timer_irq_action = {
+	.name = "timer",
+};
+
+static void __init irq_ivector_init(void)
+{
+	unsigned long size, order;
+	unsigned int ivecs;
+
+	/* If we are doing cookie only VIRQs then we do not need the ivector
+	 * table to process interrupts.
+	 */
+	if (sun4v_cookie_only_virqs())
+		return;
+
+	ivecs = size_nr_ivec();
+	size = sizeof(struct ino_bucket) * ivecs;
+	order = get_order(size);
+	ivector_table = (struct ino_bucket *)
+		__get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+	if (!ivector_table) {
+		prom_printf("Fatal error, cannot allocate ivector_table\n");
+		prom_halt();
+	}
+	__flush_dcache_range((unsigned long) ivector_table,
+			     ((unsigned long) ivector_table) + size);
+
+	ivector_table_pa = __pa(ivector_table);
+}
+
+/* Only invoked on boot processor.*/
+void __init init_IRQ(void)
+{
+	irq_init_hv();
+	irq_ivector_init();
+	map_prom_timers();
+	kill_prom_timer();
+
+	if (tlb_type == hypervisor)
+		sun4v_init_mondo_queues();
+
+	init_send_mondo_info();
+
+	if (tlb_type == hypervisor) {
+		/* Load up the boot cpu's entries.  */
+		sun4v_register_mondo_queues(hard_smp_processor_id());
+	}
+
+	/* We need to clear any IRQ's pending in the soft interrupt
+	 * registers, a spurious one could be left around from the
+	 * PROM timer which we just disabled.
+	 */
+	clear_softint(get_softint());
+
+	/* Now that ivector table is initialized, it is safe
+	 * to receive IRQ vector traps.  We will normally take
+	 * one or two right now, in case some device PROM used
+	 * to boot us wants to speak to us.  We just ignore them.
+	 */
+	__asm__ __volatile__("rdpr	%%pstate, %%g1\n\t"
+			     "or	%%g1, %0, %%g1\n\t"
+			     "wrpr	%%g1, 0x0, %%pstate"
+			     : /* No outputs */
+			     : "i" (PSTATE_IE)
+			     : "g1");
+
+	irq_to_desc(0)->action = &timer_irq_action;
+}