1 /******************************************************************************
2 * arch/ia64/xen/irq_xen.c
4 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
5 * VA Linux Systems Japan K.K.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/cpu.h>
25 #include <xen/interface/xen.h>
26 #include <xen/interface/callback.h>
27 #include <xen/events.h>
29 #include <asm/xen/privop.h>
33 /***************************************************************************
39 xen_assign_irq_vector(int irq)
41 struct physdev_irq irq_op;
44 if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op))
51 xen_free_irq_vector(int vector)
53 struct physdev_irq irq_op;
55 if (vector < IA64_FIRST_DEVICE_VECTOR ||
56 vector > IA64_LAST_DEVICE_VECTOR)
59 irq_op.vector = vector;
60 if (HYPERVISOR_physdev_op(PHYSDEVOP_free_irq_vector, &irq_op))
61 printk(KERN_WARNING "%s: xen_free_irq_vector fail vector=%d\n",
66 static DEFINE_PER_CPU(int, xen_timer_irq) = -1;
67 static DEFINE_PER_CPU(int, xen_ipi_irq) = -1;
68 static DEFINE_PER_CPU(int, xen_resched_irq) = -1;
69 static DEFINE_PER_CPU(int, xen_cmc_irq) = -1;
70 static DEFINE_PER_CPU(int, xen_cmcp_irq) = -1;
71 static DEFINE_PER_CPU(int, xen_cpep_irq) = -1;
73 static DEFINE_PER_CPU(char[NAME_SIZE], xen_timer_name);
74 static DEFINE_PER_CPU(char[NAME_SIZE], xen_ipi_name);
75 static DEFINE_PER_CPU(char[NAME_SIZE], xen_resched_name);
76 static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmc_name);
77 static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmcp_name);
78 static DEFINE_PER_CPU(char[NAME_SIZE], xen_cpep_name);
83 struct irqaction *action;
85 /* 16 should be far optimistic value, since only several percpu irqs
86 * are registered early.
88 #define MAX_LATE_IRQ 16
89 static struct saved_irq saved_percpu_irqs[MAX_LATE_IRQ];
90 static unsigned short late_irq_cnt;
91 static unsigned short saved_irq_cnt;
92 static int xen_slab_ready;
95 #include <linux/sched.h>
97 /* Dummy stub. Though we may check XEN_RESCHEDULE_VECTOR before __do_IRQ,
98 * it ends up to issue several memory accesses upon percpu data and
99 * thus adds unnecessary traffic to other paths.
102 xen_dummy_handler(int irq, void *dev_id)
108 xen_resched_handler(int irq, void *dev_id)
114 static struct irqaction xen_ipi_irqaction = {
115 .handler = handle_IPI,
116 .flags = IRQF_DISABLED,
120 static struct irqaction xen_resched_irqaction = {
121 .handler = xen_resched_handler,
122 .flags = IRQF_DISABLED,
126 static struct irqaction xen_tlb_irqaction = {
127 .handler = xen_dummy_handler,
128 .flags = IRQF_DISABLED,
134 * This is xen version percpu irq registration, which needs bind
135 * to xen specific evtchn sub-system. One trick here is that xen
136 * evtchn binding interface depends on kmalloc because related
137 * port needs to be freed at device/cpu down. So we cache the
138 * registration on BSP before slab is ready and then deal them
139 * at later point. For rest instances happening after slab ready,
140 * we hook them to xen evtchn immediately.
142 * FIXME: MCA is not supported by far, and thus "nomca" boot param is
146 __xen_register_percpu_irq(unsigned int cpu, unsigned int vec,
147 struct irqaction *action, int save)
151 if (xen_slab_ready) {
153 case IA64_TIMER_VECTOR:
154 snprintf(per_cpu(xen_timer_name, cpu),
155 sizeof(per_cpu(xen_timer_name, cpu)),
156 "%s%d", action->name, cpu);
157 irq = bind_virq_to_irqhandler(VIRQ_ITC, cpu,
158 action->handler, action->flags,
159 per_cpu(xen_timer_name, cpu), action->dev_id);
160 per_cpu(xen_timer_irq, cpu) = irq;
162 case IA64_IPI_RESCHEDULE:
163 snprintf(per_cpu(xen_resched_name, cpu),
164 sizeof(per_cpu(xen_resched_name, cpu)),
165 "%s%d", action->name, cpu);
166 irq = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, cpu,
167 action->handler, action->flags,
168 per_cpu(xen_resched_name, cpu), action->dev_id);
169 per_cpu(xen_resched_irq, cpu) = irq;
171 case IA64_IPI_VECTOR:
172 snprintf(per_cpu(xen_ipi_name, cpu),
173 sizeof(per_cpu(xen_ipi_name, cpu)),
174 "%s%d", action->name, cpu);
175 irq = bind_ipi_to_irqhandler(XEN_IPI_VECTOR, cpu,
176 action->handler, action->flags,
177 per_cpu(xen_ipi_name, cpu), action->dev_id);
178 per_cpu(xen_ipi_irq, cpu) = irq;
180 case IA64_CMC_VECTOR:
181 snprintf(per_cpu(xen_cmc_name, cpu),
182 sizeof(per_cpu(xen_cmc_name, cpu)),
183 "%s%d", action->name, cpu);
184 irq = bind_virq_to_irqhandler(VIRQ_MCA_CMC, cpu,
187 per_cpu(xen_cmc_name, cpu),
189 per_cpu(xen_cmc_irq, cpu) = irq;
191 case IA64_CMCP_VECTOR:
192 snprintf(per_cpu(xen_cmcp_name, cpu),
193 sizeof(per_cpu(xen_cmcp_name, cpu)),
194 "%s%d", action->name, cpu);
195 irq = bind_ipi_to_irqhandler(XEN_CMCP_VECTOR, cpu,
198 per_cpu(xen_cmcp_name, cpu),
200 per_cpu(xen_cmcp_irq, cpu) = irq;
202 case IA64_CPEP_VECTOR:
203 snprintf(per_cpu(xen_cpep_name, cpu),
204 sizeof(per_cpu(xen_cpep_name, cpu)),
205 "%s%d", action->name, cpu);
206 irq = bind_ipi_to_irqhandler(XEN_CPEP_VECTOR, cpu,
209 per_cpu(xen_cpep_name, cpu),
211 per_cpu(xen_cpep_irq, cpu) = irq;
213 case IA64_CPE_VECTOR:
214 case IA64_MCA_RENDEZ_VECTOR:
215 case IA64_PERFMON_VECTOR:
216 case IA64_MCA_WAKEUP_VECTOR:
217 case IA64_SPURIOUS_INT_VECTOR:
218 /* No need to complain, these aren't supported. */
221 printk(KERN_WARNING "Percpu irq %d is unsupported "
229 * Mark percpu. Without this, migrate_irqs() will
230 * mark the interrupt for migrations and trigger it
233 irq_set_status_flags(irq, IRQ_PER_CPU);
237 /* For BSP, we cache registered percpu irqs, and then re-walk
238 * them when initializing APs
241 BUG_ON(saved_irq_cnt == MAX_LATE_IRQ);
242 saved_percpu_irqs[saved_irq_cnt].irq = vec;
243 saved_percpu_irqs[saved_irq_cnt].action = action;
251 xen_register_percpu_irq(ia64_vector vec, struct irqaction *action)
253 __xen_register_percpu_irq(smp_processor_id(), vec, action, 1);
257 xen_bind_early_percpu_irq(void)
262 /* There's no race when accessing this cached array, since only
263 * BSP will face with such step shortly
265 for (i = 0; i < late_irq_cnt; i++)
266 __xen_register_percpu_irq(smp_processor_id(),
267 saved_percpu_irqs[i].irq,
268 saved_percpu_irqs[i].action, 0);
271 /* FIXME: There's no obvious point to check whether slab is ready. So
272 * a hack is used here by utilizing a late time hook.
275 #ifdef CONFIG_HOTPLUG_CPU
276 static int unbind_evtchn_callback(struct notifier_block *nfb,
277 unsigned long action, void *hcpu)
279 unsigned int cpu = (unsigned long)hcpu;
281 if (action == CPU_DEAD) {
282 /* Unregister evtchn. */
283 if (per_cpu(xen_cpep_irq, cpu) >= 0) {
284 unbind_from_irqhandler(per_cpu(xen_cpep_irq, cpu),
286 per_cpu(xen_cpep_irq, cpu) = -1;
288 if (per_cpu(xen_cmcp_irq, cpu) >= 0) {
289 unbind_from_irqhandler(per_cpu(xen_cmcp_irq, cpu),
291 per_cpu(xen_cmcp_irq, cpu) = -1;
293 if (per_cpu(xen_cmc_irq, cpu) >= 0) {
294 unbind_from_irqhandler(per_cpu(xen_cmc_irq, cpu), NULL);
295 per_cpu(xen_cmc_irq, cpu) = -1;
297 if (per_cpu(xen_ipi_irq, cpu) >= 0) {
298 unbind_from_irqhandler(per_cpu(xen_ipi_irq, cpu), NULL);
299 per_cpu(xen_ipi_irq, cpu) = -1;
301 if (per_cpu(xen_resched_irq, cpu) >= 0) {
302 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu),
304 per_cpu(xen_resched_irq, cpu) = -1;
306 if (per_cpu(xen_timer_irq, cpu) >= 0) {
307 unbind_from_irqhandler(per_cpu(xen_timer_irq, cpu),
309 per_cpu(xen_timer_irq, cpu) = -1;
315 static struct notifier_block unbind_evtchn_notifier = {
316 .notifier_call = unbind_evtchn_callback,
321 void xen_smp_intr_init_early(unsigned int cpu)
326 for (i = 0; i < saved_irq_cnt; i++)
327 __xen_register_percpu_irq(cpu, saved_percpu_irqs[i].irq,
328 saved_percpu_irqs[i].action, 0);
332 void xen_smp_intr_init(void)
335 unsigned int cpu = smp_processor_id();
336 struct callback_register event = {
337 .type = CALLBACKTYPE_event,
338 .address = { .ip = (unsigned long)&xen_event_callback },
342 /* Initialization was already done for boot cpu. */
343 #ifdef CONFIG_HOTPLUG_CPU
344 /* Register the notifier only once. */
345 register_cpu_notifier(&unbind_evtchn_notifier);
350 /* This should be piggyback when setup vcpu guest context */
351 BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
352 #endif /* CONFIG_SMP */
358 struct callback_register event = {
359 .type = CALLBACKTYPE_event,
360 .address = { .ip = (unsigned long)&xen_event_callback },
364 BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
365 late_time_init = xen_bind_early_percpu_irq;
369 xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
372 /* TODO: we need to call vcpu_up here */
373 if (unlikely(vector == ap_wakeup_vector)) {
375 * This should be in __cpu_up(cpu) in ia64 smpboot.c
376 * like x86. But don't want to modify it,
379 xen_smp_intr_init_early(cpu);
381 xen_send_ipi(cpu, vector);
382 /* vcpu_prepare_and_up(cpu); */
388 case IA64_IPI_VECTOR:
389 xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
391 case IA64_IPI_RESCHEDULE:
392 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
394 case IA64_CMCP_VECTOR:
395 xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
397 case IA64_CPEP_VECTOR:
398 xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
400 case IA64_TIMER_VECTOR: {
401 /* this is used only once by check_sal_cache_flush()
405 xen_send_ipi(cpu, IA64_TIMER_VECTOR);
412 printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
414 notify_remote_via_irq(0); /* defaults to 0 irq */
420 xen_register_ipi(void)
423 register_percpu_irq(IA64_IPI_VECTOR, &xen_ipi_irqaction);
424 register_percpu_irq(IA64_IPI_RESCHEDULE, &xen_resched_irqaction);
425 register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &xen_tlb_irqaction);
430 xen_resend_irq(unsigned int vector)
432 (void)resend_irq_on_evtchn(vector);
435 const struct pv_irq_ops xen_irq_ops __initconst = {
436 .register_ipi = xen_register_ipi,
438 .assign_irq_vector = xen_assign_irq_vector,
439 .free_irq_vector = xen_free_irq_vector,
440 .register_percpu_irq = xen_register_percpu_irq,
442 .resend_irq = xen_resend_irq,