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Diffstat (limited to 'arch/ia64/xen/irq_xen.c')
-rw-r--r--arch/ia64/xen/irq_xen.c443
1 files changed, 0 insertions, 443 deletions
diff --git a/arch/ia64/xen/irq_xen.c b/arch/ia64/xen/irq_xen.c
deleted file mode 100644
index efb74dafec4..00000000000
--- a/arch/ia64/xen/irq_xen.c
+++ /dev/null
@@ -1,443 +0,0 @@
-/******************************************************************************
- * arch/ia64/xen/irq_xen.c
- *
- * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
- * VA Linux Systems Japan K.K.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-#include <linux/cpu.h>
-
-#include <xen/interface/xen.h>
-#include <xen/interface/callback.h>
-#include <xen/events.h>
-
-#include <asm/xen/privop.h>
-
-#include "irq_xen.h"
-
-/***************************************************************************
- * pv_irq_ops
- * irq operations
- */
-
-static int
-xen_assign_irq_vector(int irq)
-{
- struct physdev_irq irq_op;
-
- irq_op.irq = irq;
- if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op))
- return -ENOSPC;
-
- return irq_op.vector;
-}
-
-static void
-xen_free_irq_vector(int vector)
-{
- struct physdev_irq irq_op;
-
- if (vector < IA64_FIRST_DEVICE_VECTOR ||
- vector > IA64_LAST_DEVICE_VECTOR)
- return;
-
- irq_op.vector = vector;
- if (HYPERVISOR_physdev_op(PHYSDEVOP_free_irq_vector, &irq_op))
- printk(KERN_WARNING "%s: xen_free_irq_vector fail vector=%d\n",
- __func__, vector);
-}
-
-
-static DEFINE_PER_CPU(int, xen_timer_irq) = -1;
-static DEFINE_PER_CPU(int, xen_ipi_irq) = -1;
-static DEFINE_PER_CPU(int, xen_resched_irq) = -1;
-static DEFINE_PER_CPU(int, xen_cmc_irq) = -1;
-static DEFINE_PER_CPU(int, xen_cmcp_irq) = -1;
-static DEFINE_PER_CPU(int, xen_cpep_irq) = -1;
-#define NAME_SIZE 15
-static DEFINE_PER_CPU(char[NAME_SIZE], xen_timer_name);
-static DEFINE_PER_CPU(char[NAME_SIZE], xen_ipi_name);
-static DEFINE_PER_CPU(char[NAME_SIZE], xen_resched_name);
-static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmc_name);
-static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmcp_name);
-static DEFINE_PER_CPU(char[NAME_SIZE], xen_cpep_name);
-#undef NAME_SIZE
-
-struct saved_irq {
- unsigned int irq;
- struct irqaction *action;
-};
-/* 16 should be far optimistic value, since only several percpu irqs
- * are registered early.
- */
-#define MAX_LATE_IRQ 16
-static struct saved_irq saved_percpu_irqs[MAX_LATE_IRQ];
-static unsigned short late_irq_cnt;
-static unsigned short saved_irq_cnt;
-static int xen_slab_ready;
-
-#ifdef CONFIG_SMP
-#include <linux/sched.h>
-
-/* Dummy stub. Though we may check XEN_RESCHEDULE_VECTOR before __do_IRQ,
- * it ends up to issue several memory accesses upon percpu data and
- * thus adds unnecessary traffic to other paths.
- */
-static irqreturn_t
-xen_dummy_handler(int irq, void *dev_id)
-{
- return IRQ_HANDLED;
-}
-
-static irqreturn_t
-xen_resched_handler(int irq, void *dev_id)
-{
- scheduler_ipi();
- return IRQ_HANDLED;
-}
-
-static struct irqaction xen_ipi_irqaction = {
- .handler = handle_IPI,
- .flags = IRQF_DISABLED,
- .name = "IPI"
-};
-
-static struct irqaction xen_resched_irqaction = {
- .handler = xen_resched_handler,
- .flags = IRQF_DISABLED,
- .name = "resched"
-};
-
-static struct irqaction xen_tlb_irqaction = {
- .handler = xen_dummy_handler,
- .flags = IRQF_DISABLED,
- .name = "tlb_flush"
-};
-#endif
-
-/*
- * This is xen version percpu irq registration, which needs bind
- * to xen specific evtchn sub-system. One trick here is that xen
- * evtchn binding interface depends on kmalloc because related
- * port needs to be freed at device/cpu down. So we cache the
- * registration on BSP before slab is ready and then deal them
- * at later point. For rest instances happening after slab ready,
- * we hook them to xen evtchn immediately.
- *
- * FIXME: MCA is not supported by far, and thus "nomca" boot param is
- * required.
- */
-static void
-__xen_register_percpu_irq(unsigned int cpu, unsigned int vec,
- struct irqaction *action, int save)
-{
- int irq = 0;
-
- if (xen_slab_ready) {
- switch (vec) {
- case IA64_TIMER_VECTOR:
- snprintf(per_cpu(xen_timer_name, cpu),
- sizeof(per_cpu(xen_timer_name, cpu)),
- "%s%d", action->name, cpu);
- irq = bind_virq_to_irqhandler(VIRQ_ITC, cpu,
- action->handler, action->flags,
- per_cpu(xen_timer_name, cpu), action->dev_id);
- per_cpu(xen_timer_irq, cpu) = irq;
- break;
- case IA64_IPI_RESCHEDULE:
- snprintf(per_cpu(xen_resched_name, cpu),
- sizeof(per_cpu(xen_resched_name, cpu)),
- "%s%d", action->name, cpu);
- irq = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, cpu,
- action->handler, action->flags,
- per_cpu(xen_resched_name, cpu), action->dev_id);
- per_cpu(xen_resched_irq, cpu) = irq;
- break;
- case IA64_IPI_VECTOR:
- snprintf(per_cpu(xen_ipi_name, cpu),
- sizeof(per_cpu(xen_ipi_name, cpu)),
- "%s%d", action->name, cpu);
- irq = bind_ipi_to_irqhandler(XEN_IPI_VECTOR, cpu,
- action->handler, action->flags,
- per_cpu(xen_ipi_name, cpu), action->dev_id);
- per_cpu(xen_ipi_irq, cpu) = irq;
- break;
- case IA64_CMC_VECTOR:
- snprintf(per_cpu(xen_cmc_name, cpu),
- sizeof(per_cpu(xen_cmc_name, cpu)),
- "%s%d", action->name, cpu);
- irq = bind_virq_to_irqhandler(VIRQ_MCA_CMC, cpu,
- action->handler,
- action->flags,
- per_cpu(xen_cmc_name, cpu),
- action->dev_id);
- per_cpu(xen_cmc_irq, cpu) = irq;
- break;
- case IA64_CMCP_VECTOR:
- snprintf(per_cpu(xen_cmcp_name, cpu),
- sizeof(per_cpu(xen_cmcp_name, cpu)),
- "%s%d", action->name, cpu);
- irq = bind_ipi_to_irqhandler(XEN_CMCP_VECTOR, cpu,
- action->handler,
- action->flags,
- per_cpu(xen_cmcp_name, cpu),
- action->dev_id);
- per_cpu(xen_cmcp_irq, cpu) = irq;
- break;
- case IA64_CPEP_VECTOR:
- snprintf(per_cpu(xen_cpep_name, cpu),
- sizeof(per_cpu(xen_cpep_name, cpu)),
- "%s%d", action->name, cpu);
- irq = bind_ipi_to_irqhandler(XEN_CPEP_VECTOR, cpu,
- action->handler,
- action->flags,
- per_cpu(xen_cpep_name, cpu),
- action->dev_id);
- per_cpu(xen_cpep_irq, cpu) = irq;
- break;
- case IA64_CPE_VECTOR:
- case IA64_MCA_RENDEZ_VECTOR:
- case IA64_PERFMON_VECTOR:
- case IA64_MCA_WAKEUP_VECTOR:
- case IA64_SPURIOUS_INT_VECTOR:
- /* No need to complain, these aren't supported. */
- break;
- default:
- printk(KERN_WARNING "Percpu irq %d is unsupported "
- "by xen!\n", vec);
- break;
- }
- BUG_ON(irq < 0);
-
- if (irq > 0) {
- /*
- * Mark percpu. Without this, migrate_irqs() will
- * mark the interrupt for migrations and trigger it
- * on cpu hotplug.
- */
- irq_set_status_flags(irq, IRQ_PER_CPU);
- }
- }
-
- /* For BSP, we cache registered percpu irqs, and then re-walk
- * them when initializing APs
- */
- if (!cpu && save) {
- BUG_ON(saved_irq_cnt == MAX_LATE_IRQ);
- saved_percpu_irqs[saved_irq_cnt].irq = vec;
- saved_percpu_irqs[saved_irq_cnt].action = action;
- saved_irq_cnt++;
- if (!xen_slab_ready)
- late_irq_cnt++;
- }
-}
-
-static void
-xen_register_percpu_irq(ia64_vector vec, struct irqaction *action)
-{
- __xen_register_percpu_irq(smp_processor_id(), vec, action, 1);
-}
-
-static void
-xen_bind_early_percpu_irq(void)
-{
- int i;
-
- xen_slab_ready = 1;
- /* There's no race when accessing this cached array, since only
- * BSP will face with such step shortly
- */
- for (i = 0; i < late_irq_cnt; i++)
- __xen_register_percpu_irq(smp_processor_id(),
- saved_percpu_irqs[i].irq,
- saved_percpu_irqs[i].action, 0);
-}
-
-/* FIXME: There's no obvious point to check whether slab is ready. So
- * a hack is used here by utilizing a late time hook.
- */
-
-#ifdef CONFIG_HOTPLUG_CPU
-static int unbind_evtchn_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
-
- if (action == CPU_DEAD) {
- /* Unregister evtchn. */
- if (per_cpu(xen_cpep_irq, cpu) >= 0) {
- unbind_from_irqhandler(per_cpu(xen_cpep_irq, cpu),
- NULL);
- per_cpu(xen_cpep_irq, cpu) = -1;
- }
- if (per_cpu(xen_cmcp_irq, cpu) >= 0) {
- unbind_from_irqhandler(per_cpu(xen_cmcp_irq, cpu),
- NULL);
- per_cpu(xen_cmcp_irq, cpu) = -1;
- }
- if (per_cpu(xen_cmc_irq, cpu) >= 0) {
- unbind_from_irqhandler(per_cpu(xen_cmc_irq, cpu), NULL);
- per_cpu(xen_cmc_irq, cpu) = -1;
- }
- if (per_cpu(xen_ipi_irq, cpu) >= 0) {
- unbind_from_irqhandler(per_cpu(xen_ipi_irq, cpu), NULL);
- per_cpu(xen_ipi_irq, cpu) = -1;
- }
- if (per_cpu(xen_resched_irq, cpu) >= 0) {
- unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu),
- NULL);
- per_cpu(xen_resched_irq, cpu) = -1;
- }
- if (per_cpu(xen_timer_irq, cpu) >= 0) {
- unbind_from_irqhandler(per_cpu(xen_timer_irq, cpu),
- NULL);
- per_cpu(xen_timer_irq, cpu) = -1;
- }
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block unbind_evtchn_notifier = {
- .notifier_call = unbind_evtchn_callback,
- .priority = 0
-};
-#endif
-
-void xen_smp_intr_init_early(unsigned int cpu)
-{
-#ifdef CONFIG_SMP
- unsigned int i;
-
- for (i = 0; i < saved_irq_cnt; i++)
- __xen_register_percpu_irq(cpu, saved_percpu_irqs[i].irq,
- saved_percpu_irqs[i].action, 0);
-#endif
-}
-
-void xen_smp_intr_init(void)
-{
-#ifdef CONFIG_SMP
- unsigned int cpu = smp_processor_id();
- struct callback_register event = {
- .type = CALLBACKTYPE_event,
- .address = { .ip = (unsigned long)&xen_event_callback },
- };
-
- if (cpu == 0) {
- /* Initialization was already done for boot cpu. */
-#ifdef CONFIG_HOTPLUG_CPU
- /* Register the notifier only once. */
- register_cpu_notifier(&unbind_evtchn_notifier);
-#endif
- return;
- }
-
- /* This should be piggyback when setup vcpu guest context */
- BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
-#endif /* CONFIG_SMP */
-}
-
-void __init
-xen_irq_init(void)
-{
- struct callback_register event = {
- .type = CALLBACKTYPE_event,
- .address = { .ip = (unsigned long)&xen_event_callback },
- };
-
- xen_init_IRQ();
- BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
- late_time_init = xen_bind_early_percpu_irq;
-}
-
-void
-xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
-{
-#ifdef CONFIG_SMP
- /* TODO: we need to call vcpu_up here */
- if (unlikely(vector == ap_wakeup_vector)) {
- /* XXX
- * This should be in __cpu_up(cpu) in ia64 smpboot.c
- * like x86. But don't want to modify it,
- * keep it untouched.
- */
- xen_smp_intr_init_early(cpu);
-
- xen_send_ipi(cpu, vector);
- /* vcpu_prepare_and_up(cpu); */
- return;
- }
-#endif
-
- switch (vector) {
- case IA64_IPI_VECTOR:
- xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
- break;
- case IA64_IPI_RESCHEDULE:
- xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
- break;
- case IA64_CMCP_VECTOR:
- xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
- break;
- case IA64_CPEP_VECTOR:
- xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
- break;
- case IA64_TIMER_VECTOR: {
- /* this is used only once by check_sal_cache_flush()
- at boot time */
- static int used = 0;
- if (!used) {
- xen_send_ipi(cpu, IA64_TIMER_VECTOR);
- used = 1;
- break;
- }
- /* fallthrough */
- }
- default:
- printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
- vector);
- notify_remote_via_irq(0); /* defaults to 0 irq */
- break;
- }
-}
-
-static void __init
-xen_register_ipi(void)
-{
-#ifdef CONFIG_SMP
- register_percpu_irq(IA64_IPI_VECTOR, &xen_ipi_irqaction);
- register_percpu_irq(IA64_IPI_RESCHEDULE, &xen_resched_irqaction);
- register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &xen_tlb_irqaction);
-#endif
-}
-
-static void
-xen_resend_irq(unsigned int vector)
-{
- (void)resend_irq_on_evtchn(vector);
-}
-
-const struct pv_irq_ops xen_irq_ops __initconst = {
- .register_ipi = xen_register_ipi,
-
- .assign_irq_vector = xen_assign_irq_vector,
- .free_irq_vector = xen_free_irq_vector,
- .register_percpu_irq = xen_register_percpu_irq,
-
- .resend_irq = xen_resend_irq,
-};
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