diff options
Diffstat (limited to 'arch/ia64/xen/irq_xen.c')
| -rw-r--r-- | arch/ia64/xen/irq_xen.c | 443 |
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 efb74dafec4d..000000000000 --- 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, -}; |