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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 efb74dafec4d..000000000000
--- a/arch/ia64/xen/irq_xen.c
+++ /dev/null
@@ -1,443 +0,0 @@
1/******************************************************************************
2 * arch/ia64/xen/irq_xen.c
3 *
4 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
5 * VA Linux Systems Japan K.K.
6 *
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.
11 *
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.
16 *
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
20 *
21 */
22
23#include <linux/cpu.h>
24
25#include <xen/interface/xen.h>
26#include <xen/interface/callback.h>
27#include <xen/events.h>
28
29#include <asm/xen/privop.h>
30
31#include "irq_xen.h"
32
33/***************************************************************************
34 * pv_irq_ops
35 * irq operations
36 */
37
38static int
39xen_assign_irq_vector(int irq)
40{
41 struct physdev_irq irq_op;
42
43 irq_op.irq = irq;
44 if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op))
45 return -ENOSPC;
46
47 return irq_op.vector;
48}
49
50static void
51xen_free_irq_vector(int vector)
52{
53 struct physdev_irq irq_op;
54
55 if (vector < IA64_FIRST_DEVICE_VECTOR ||
56 vector > IA64_LAST_DEVICE_VECTOR)
57 return;
58
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",
62 __func__, vector);
63}
64
65
66static DEFINE_PER_CPU(int, xen_timer_irq) = -1;
67static DEFINE_PER_CPU(int, xen_ipi_irq) = -1;
68static DEFINE_PER_CPU(int, xen_resched_irq) = -1;
69static DEFINE_PER_CPU(int, xen_cmc_irq) = -1;
70static DEFINE_PER_CPU(int, xen_cmcp_irq) = -1;
71static DEFINE_PER_CPU(int, xen_cpep_irq) = -1;
72#define NAME_SIZE 15
73static DEFINE_PER_CPU(char[NAME_SIZE], xen_timer_name);
74static DEFINE_PER_CPU(char[NAME_SIZE], xen_ipi_name);
75static DEFINE_PER_CPU(char[NAME_SIZE], xen_resched_name);
76static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmc_name);
77static DEFINE_PER_CPU(char[NAME_SIZE], xen_cmcp_name);
78static DEFINE_PER_CPU(char[NAME_SIZE], xen_cpep_name);
79#undef NAME_SIZE
80
81struct saved_irq {
82 unsigned int irq;
83 struct irqaction *action;
84};
85/* 16 should be far optimistic value, since only several percpu irqs
86 * are registered early.
87 */
88#define MAX_LATE_IRQ 16
89static struct saved_irq saved_percpu_irqs[MAX_LATE_IRQ];
90static unsigned short late_irq_cnt;
91static unsigned short saved_irq_cnt;
92static int xen_slab_ready;
93
94#ifdef CONFIG_SMP
95#include <linux/sched.h>
96
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.
100 */
101static irqreturn_t
102xen_dummy_handler(int irq, void *dev_id)
103{
104 return IRQ_HANDLED;
105}
106
107static irqreturn_t
108xen_resched_handler(int irq, void *dev_id)
109{
110 scheduler_ipi();
111 return IRQ_HANDLED;
112}
113
114static struct irqaction xen_ipi_irqaction = {
115 .handler = handle_IPI,
116 .flags = IRQF_DISABLED,
117 .name = "IPI"
118};
119
120static struct irqaction xen_resched_irqaction = {
121 .handler = xen_resched_handler,
122 .flags = IRQF_DISABLED,
123 .name = "resched"
124};
125
126static struct irqaction xen_tlb_irqaction = {
127 .handler = xen_dummy_handler,
128 .flags = IRQF_DISABLED,
129 .name = "tlb_flush"
130};
131#endif
132
133/*
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.
141 *
142 * FIXME: MCA is not supported by far, and thus "nomca" boot param is
143 * required.
144 */
145static void
146__xen_register_percpu_irq(unsigned int cpu, unsigned int vec,
147 struct irqaction *action, int save)
148{
149 int irq = 0;
150
151 if (xen_slab_ready) {
152 switch (vec) {
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;
161 break;
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;
170 break;
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;
179 break;
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,
185 action->handler,
186 action->flags,
187 per_cpu(xen_cmc_name, cpu),
188 action->dev_id);
189 per_cpu(xen_cmc_irq, cpu) = irq;
190 break;
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,
196 action->handler,
197 action->flags,
198 per_cpu(xen_cmcp_name, cpu),
199 action->dev_id);
200 per_cpu(xen_cmcp_irq, cpu) = irq;
201 break;
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,
207 action->handler,
208 action->flags,
209 per_cpu(xen_cpep_name, cpu),
210 action->dev_id);
211 per_cpu(xen_cpep_irq, cpu) = irq;
212 break;
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. */
219 break;
220 default:
221 printk(KERN_WARNING "Percpu irq %d is unsupported "
222 "by xen!\n", vec);
223 break;
224 }
225 BUG_ON(irq < 0);
226
227 if (irq > 0) {
228 /*
229 * Mark percpu. Without this, migrate_irqs() will
230 * mark the interrupt for migrations and trigger it
231 * on cpu hotplug.
232 */
233 irq_set_status_flags(irq, IRQ_PER_CPU);
234 }
235 }
236
237 /* For BSP, we cache registered percpu irqs, and then re-walk
238 * them when initializing APs
239 */
240 if (!cpu && save) {
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;
244 saved_irq_cnt++;
245 if (!xen_slab_ready)
246 late_irq_cnt++;
247 }
248}
249
250static void
251xen_register_percpu_irq(ia64_vector vec, struct irqaction *action)
252{
253 __xen_register_percpu_irq(smp_processor_id(), vec, action, 1);
254}
255
256static void
257xen_bind_early_percpu_irq(void)
258{
259 int i;
260
261 xen_slab_ready = 1;
262 /* There's no race when accessing this cached array, since only
263 * BSP will face with such step shortly
264 */
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);
269}
270
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.
273 */
274
275#ifdef CONFIG_HOTPLUG_CPU
276static int unbind_evtchn_callback(struct notifier_block *nfb,
277 unsigned long action, void *hcpu)
278{
279 unsigned int cpu = (unsigned long)hcpu;
280
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),
285 NULL);
286 per_cpu(xen_cpep_irq, cpu) = -1;
287 }
288 if (per_cpu(xen_cmcp_irq, cpu) >= 0) {
289 unbind_from_irqhandler(per_cpu(xen_cmcp_irq, cpu),
290 NULL);
291 per_cpu(xen_cmcp_irq, cpu) = -1;
292 }
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;
296 }
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;
300 }
301 if (per_cpu(xen_resched_irq, cpu) >= 0) {
302 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu),
303 NULL);
304 per_cpu(xen_resched_irq, cpu) = -1;
305 }
306 if (per_cpu(xen_timer_irq, cpu) >= 0) {
307 unbind_from_irqhandler(per_cpu(xen_timer_irq, cpu),
308 NULL);
309 per_cpu(xen_timer_irq, cpu) = -1;
310 }
311 }
312 return NOTIFY_OK;
313}
314
315static struct notifier_block unbind_evtchn_notifier = {
316 .notifier_call = unbind_evtchn_callback,
317 .priority = 0
318};
319#endif
320
321void xen_smp_intr_init_early(unsigned int cpu)
322{
323#ifdef CONFIG_SMP
324 unsigned int i;
325
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);
329#endif
330}
331
332void xen_smp_intr_init(void)
333{
334#ifdef CONFIG_SMP
335 unsigned int cpu = smp_processor_id();
336 struct callback_register event = {
337 .type = CALLBACKTYPE_event,
338 .address = { .ip = (unsigned long)&xen_event_callback },
339 };
340
341 if (cpu == 0) {
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);
346#endif
347 return;
348 }
349
350 /* This should be piggyback when setup vcpu guest context */
351 BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
352#endif /* CONFIG_SMP */
353}
354
355void __init
356xen_irq_init(void)
357{
358 struct callback_register event = {
359 .type = CALLBACKTYPE_event,
360 .address = { .ip = (unsigned long)&xen_event_callback },
361 };
362
363 xen_init_IRQ();
364 BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
365 late_time_init = xen_bind_early_percpu_irq;
366}
367
368void
369xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
370{
371#ifdef CONFIG_SMP
372 /* TODO: we need to call vcpu_up here */
373 if (unlikely(vector == ap_wakeup_vector)) {
374 /* XXX
375 * This should be in __cpu_up(cpu) in ia64 smpboot.c
376 * like x86. But don't want to modify it,
377 * keep it untouched.
378 */
379 xen_smp_intr_init_early(cpu);
380
381 xen_send_ipi(cpu, vector);
382 /* vcpu_prepare_and_up(cpu); */
383 return;
384 }
385#endif
386
387 switch (vector) {
388 case IA64_IPI_VECTOR:
389 xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
390 break;
391 case IA64_IPI_RESCHEDULE:
392 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
393 break;
394 case IA64_CMCP_VECTOR:
395 xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
396 break;
397 case IA64_CPEP_VECTOR:
398 xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
399 break;
400 case IA64_TIMER_VECTOR: {
401 /* this is used only once by check_sal_cache_flush()
402 at boot time */
403 static int used = 0;
404 if (!used) {
405 xen_send_ipi(cpu, IA64_TIMER_VECTOR);
406 used = 1;
407 break;
408 }
409 /* fallthrough */
410 }
411 default:
412 printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
413 vector);
414 notify_remote_via_irq(0); /* defaults to 0 irq */
415 break;
416 }
417}
418
419static void __init
420xen_register_ipi(void)
421{
422#ifdef CONFIG_SMP
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);
426#endif
427}
428
429static void
430xen_resend_irq(unsigned int vector)
431{
432 (void)resend_irq_on_evtchn(vector);
433}
434
435const struct pv_irq_ops xen_irq_ops __initconst = {
436 .register_ipi = xen_register_ipi,
437
438 .assign_irq_vector = xen_assign_irq_vector,
439 .free_irq_vector = xen_free_irq_vector,
440 .register_percpu_irq = xen_register_percpu_irq,
441
442 .resend_irq = xen_resend_irq,
443};
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-15 03:26:38 -0400