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