Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/arch/ia64/kernel/irq_ia64.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1998-2001 Hewlett-Packard Co | |
5 | * Stephane Eranian <eranian@hpl.hp.com> | |
6 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
7 | * | |
8 | * 6/10/99: Updated to bring in sync with x86 version to facilitate | |
9 | * support for SMP and different interrupt controllers. | |
10 | * | |
11 | * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector | |
12 | * PCI to vector allocation routine. | |
13 | * 04/14/2004 Ashok Raj <ashok.raj@intel.com> | |
14 | * Added CPU Hotplug handling for IPF. | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | ||
19 | #include <linux/jiffies.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/kernel_stat.h> | |
1da177e4 | 25 | #include <linux/ptrace.h> |
1da177e4 LT |
26 | #include <linux/signal.h> |
27 | #include <linux/smp.h> | |
1da177e4 LT |
28 | #include <linux/threads.h> |
29 | #include <linux/bitops.h> | |
b6cf2583 | 30 | #include <linux/irq.h> |
7683a3f9 | 31 | #include <linux/ratelimit.h> |
4de0a759 | 32 | #include <linux/acpi.h> |
184748cc | 33 | #include <linux/sched.h> |
1da177e4 LT |
34 | |
35 | #include <asm/delay.h> | |
36 | #include <asm/intrinsics.h> | |
37 | #include <asm/io.h> | |
38 | #include <asm/hw_irq.h> | |
39 | #include <asm/machvec.h> | |
40 | #include <asm/pgtable.h> | |
3be44b9c | 41 | #include <asm/tlbflush.h> |
1da177e4 LT |
42 | |
43 | #ifdef CONFIG_PERFMON | |
44 | # include <asm/perfmon.h> | |
45 | #endif | |
46 | ||
47 | #define IRQ_DEBUG 0 | |
48 | ||
e1b30a39 YI |
49 | #define IRQ_VECTOR_UNASSIGNED (0) |
50 | ||
51 | #define IRQ_UNUSED (0) | |
52 | #define IRQ_USED (1) | |
53 | #define IRQ_RSVD (2) | |
54 | ||
10083072 MM |
55 | /* These can be overridden in platform_irq_init */ |
56 | int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR; | |
57 | int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR; | |
58 | ||
1da177e4 LT |
59 | /* default base addr of IPI table */ |
60 | void __iomem *ipi_base_addr = ((void __iomem *) | |
61 | (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR)); | |
62 | ||
4994be1b YI |
63 | static cpumask_t vector_allocation_domain(int cpu); |
64 | ||
1da177e4 LT |
65 | /* |
66 | * Legacy IRQ to IA-64 vector translation table. | |
67 | */ | |
68 | __u8 isa_irq_to_vector_map[16] = { | |
69 | /* 8259 IRQ translation, first 16 entries */ | |
70 | 0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29, | |
71 | 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21 | |
72 | }; | |
73 | EXPORT_SYMBOL(isa_irq_to_vector_map); | |
74 | ||
e1b30a39 YI |
75 | DEFINE_SPINLOCK(vector_lock); |
76 | ||
77 | struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = { | |
4994be1b YI |
78 | [0 ... NR_IRQS - 1] = { |
79 | .vector = IRQ_VECTOR_UNASSIGNED, | |
80 | .domain = CPU_MASK_NONE | |
81 | } | |
e1b30a39 YI |
82 | }; |
83 | ||
84 | DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = { | |
17764d24 | 85 | [0 ... IA64_NUM_VECTORS - 1] = -1 |
e1b30a39 YI |
86 | }; |
87 | ||
6ffbc823 KK |
88 | static cpumask_t vector_table[IA64_NUM_VECTORS] = { |
89 | [0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE | |
4994be1b YI |
90 | }; |
91 | ||
e1b30a39 YI |
92 | static int irq_status[NR_IRQS] = { |
93 | [0 ... NR_IRQS -1] = IRQ_UNUSED | |
94 | }; | |
95 | ||
e1b30a39 YI |
96 | static inline int find_unassigned_irq(void) |
97 | { | |
98 | int irq; | |
99 | ||
100 | for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++) | |
101 | if (irq_status[irq] == IRQ_UNUSED) | |
102 | return irq; | |
103 | return -ENOSPC; | |
104 | } | |
105 | ||
4994be1b | 106 | static inline int find_unassigned_vector(cpumask_t domain) |
e1b30a39 | 107 | { |
4994be1b | 108 | cpumask_t mask; |
6ffbc823 | 109 | int pos, vector; |
4994be1b | 110 | |
7d7f9848 | 111 | cpumask_and(&mask, &domain, cpu_online_mask); |
5d2068da | 112 | if (cpumask_empty(&mask)) |
4994be1b | 113 | return -EINVAL; |
e1b30a39 | 114 | |
4994be1b | 115 | for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) { |
6ffbc823 | 116 | vector = IA64_FIRST_DEVICE_VECTOR + pos; |
5d2068da RR |
117 | cpumask_and(&mask, &domain, &vector_table[vector]); |
118 | if (!cpumask_empty(&mask)) | |
4994be1b | 119 | continue; |
6ffbc823 | 120 | return vector; |
4994be1b | 121 | } |
e1b30a39 YI |
122 | return -ENOSPC; |
123 | } | |
124 | ||
4994be1b | 125 | static int __bind_irq_vector(int irq, int vector, cpumask_t domain) |
e1b30a39 | 126 | { |
4994be1b | 127 | cpumask_t mask; |
6ffbc823 | 128 | int cpu; |
4994be1b | 129 | struct irq_cfg *cfg = &irq_cfg[irq]; |
e1b30a39 | 130 | |
6bde71ec KK |
131 | BUG_ON((unsigned)irq >= NR_IRQS); |
132 | BUG_ON((unsigned)vector >= IA64_NUM_VECTORS); | |
133 | ||
7d7f9848 | 134 | cpumask_and(&mask, &domain, cpu_online_mask); |
5d2068da | 135 | if (cpumask_empty(&mask)) |
4994be1b | 136 | return -EINVAL; |
5d2068da | 137 | if ((cfg->vector == vector) && cpumask_equal(&cfg->domain, &domain)) |
e1b30a39 | 138 | return 0; |
4994be1b | 139 | if (cfg->vector != IRQ_VECTOR_UNASSIGNED) |
e1b30a39 | 140 | return -EBUSY; |
5d2068da | 141 | for_each_cpu(cpu, &mask) |
e1b30a39 | 142 | per_cpu(vector_irq, cpu)[vector] = irq; |
4994be1b YI |
143 | cfg->vector = vector; |
144 | cfg->domain = domain; | |
e1b30a39 | 145 | irq_status[irq] = IRQ_USED; |
5d2068da | 146 | cpumask_or(&vector_table[vector], &vector_table[vector], &domain); |
e1b30a39 YI |
147 | return 0; |
148 | } | |
149 | ||
4994be1b | 150 | int bind_irq_vector(int irq, int vector, cpumask_t domain) |
e1b30a39 YI |
151 | { |
152 | unsigned long flags; | |
153 | int ret; | |
154 | ||
155 | spin_lock_irqsave(&vector_lock, flags); | |
4994be1b | 156 | ret = __bind_irq_vector(irq, vector, domain); |
e1b30a39 YI |
157 | spin_unlock_irqrestore(&vector_lock, flags); |
158 | return ret; | |
159 | } | |
160 | ||
cd378f18 | 161 | static void __clear_irq_vector(int irq) |
e1b30a39 | 162 | { |
6ffbc823 | 163 | int vector, cpu; |
4994be1b YI |
164 | cpumask_t domain; |
165 | struct irq_cfg *cfg = &irq_cfg[irq]; | |
e1b30a39 | 166 | |
e1b30a39 | 167 | BUG_ON((unsigned)irq >= NR_IRQS); |
4994be1b YI |
168 | BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED); |
169 | vector = cfg->vector; | |
170 | domain = cfg->domain; | |
51f7bd85 | 171 | for_each_cpu_and(cpu, &cfg->domain, cpu_online_mask) |
17764d24 | 172 | per_cpu(vector_irq, cpu)[vector] = -1; |
4994be1b YI |
173 | cfg->vector = IRQ_VECTOR_UNASSIGNED; |
174 | cfg->domain = CPU_MASK_NONE; | |
e1b30a39 | 175 | irq_status[irq] = IRQ_UNUSED; |
6a4bd8d1 | 176 | cpumask_andnot(&vector_table[vector], &vector_table[vector], &domain); |
cd378f18 YI |
177 | } |
178 | ||
179 | static void clear_irq_vector(int irq) | |
180 | { | |
181 | unsigned long flags; | |
182 | ||
183 | spin_lock_irqsave(&vector_lock, flags); | |
184 | __clear_irq_vector(irq); | |
e1b30a39 YI |
185 | spin_unlock_irqrestore(&vector_lock, flags); |
186 | } | |
1da177e4 LT |
187 | |
188 | int | |
85cbc503 | 189 | ia64_native_assign_irq_vector (int irq) |
1da177e4 | 190 | { |
e1b30a39 | 191 | unsigned long flags; |
4994be1b | 192 | int vector, cpu; |
373167e8 | 193 | cpumask_t domain = CPU_MASK_NONE; |
4994be1b YI |
194 | |
195 | vector = -ENOSPC; | |
e1b30a39 | 196 | |
4994be1b | 197 | spin_lock_irqsave(&vector_lock, flags); |
4994be1b YI |
198 | for_each_online_cpu(cpu) { |
199 | domain = vector_allocation_domain(cpu); | |
200 | vector = find_unassigned_vector(domain); | |
201 | if (vector >= 0) | |
202 | break; | |
203 | } | |
e1b30a39 YI |
204 | if (vector < 0) |
205 | goto out; | |
8f5ad1a8 YI |
206 | if (irq == AUTO_ASSIGN) |
207 | irq = vector; | |
4994be1b | 208 | BUG_ON(__bind_irq_vector(irq, vector, domain)); |
e1b30a39 | 209 | out: |
4994be1b | 210 | spin_unlock_irqrestore(&vector_lock, flags); |
1da177e4 LT |
211 | return vector; |
212 | } | |
213 | ||
214 | void | |
85cbc503 | 215 | ia64_native_free_irq_vector (int vector) |
1da177e4 | 216 | { |
e1b30a39 YI |
217 | if (vector < IA64_FIRST_DEVICE_VECTOR || |
218 | vector > IA64_LAST_DEVICE_VECTOR) | |
1da177e4 | 219 | return; |
e1b30a39 | 220 | clear_irq_vector(vector); |
1da177e4 LT |
221 | } |
222 | ||
10083072 MM |
223 | int |
224 | reserve_irq_vector (int vector) | |
225 | { | |
10083072 MM |
226 | if (vector < IA64_FIRST_DEVICE_VECTOR || |
227 | vector > IA64_LAST_DEVICE_VECTOR) | |
228 | return -EINVAL; | |
4994be1b | 229 | return !!bind_irq_vector(vector, vector, CPU_MASK_ALL); |
e1b30a39 | 230 | } |
10083072 | 231 | |
e1b30a39 YI |
232 | /* |
233 | * Initialize vector_irq on a new cpu. This function must be called | |
234 | * with vector_lock held. | |
235 | */ | |
236 | void __setup_vector_irq(int cpu) | |
237 | { | |
238 | int irq, vector; | |
239 | ||
240 | /* Clear vector_irq */ | |
241 | for (vector = 0; vector < IA64_NUM_VECTORS; ++vector) | |
17764d24 | 242 | per_cpu(vector_irq, cpu)[vector] = -1; |
e1b30a39 YI |
243 | /* Mark the inuse vectors */ |
244 | for (irq = 0; irq < NR_IRQS; ++irq) { | |
5d2068da | 245 | if (!cpumask_test_cpu(cpu, &irq_cfg[irq].domain)) |
4994be1b YI |
246 | continue; |
247 | vector = irq_to_vector(irq); | |
248 | per_cpu(vector_irq, cpu)[vector] = irq; | |
e1b30a39 YI |
249 | } |
250 | } | |
251 | ||
e5bd762b | 252 | #if defined(CONFIG_SMP) && (defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG)) |
a6cd6322 | 253 | |
d080d397 YI |
254 | static enum vector_domain_type { |
255 | VECTOR_DOMAIN_NONE, | |
256 | VECTOR_DOMAIN_PERCPU | |
257 | } vector_domain_type = VECTOR_DOMAIN_NONE; | |
258 | ||
4994be1b YI |
259 | static cpumask_t vector_allocation_domain(int cpu) |
260 | { | |
d080d397 | 261 | if (vector_domain_type == VECTOR_DOMAIN_PERCPU) |
6a4bd8d1 | 262 | return *cpumask_of(cpu); |
4994be1b YI |
263 | return CPU_MASK_ALL; |
264 | } | |
265 | ||
a6cd6322 KK |
266 | static int __irq_prepare_move(int irq, int cpu) |
267 | { | |
268 | struct irq_cfg *cfg = &irq_cfg[irq]; | |
269 | int vector; | |
270 | cpumask_t domain; | |
271 | ||
272 | if (cfg->move_in_progress || cfg->move_cleanup_count) | |
273 | return -EBUSY; | |
274 | if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu)) | |
275 | return -EINVAL; | |
5d2068da | 276 | if (cpumask_test_cpu(cpu, &cfg->domain)) |
a6cd6322 KK |
277 | return 0; |
278 | domain = vector_allocation_domain(cpu); | |
279 | vector = find_unassigned_vector(domain); | |
280 | if (vector < 0) | |
281 | return -ENOSPC; | |
282 | cfg->move_in_progress = 1; | |
283 | cfg->old_domain = cfg->domain; | |
284 | cfg->vector = IRQ_VECTOR_UNASSIGNED; | |
285 | cfg->domain = CPU_MASK_NONE; | |
286 | BUG_ON(__bind_irq_vector(irq, vector, domain)); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | int irq_prepare_move(int irq, int cpu) | |
291 | { | |
292 | unsigned long flags; | |
293 | int ret; | |
294 | ||
295 | spin_lock_irqsave(&vector_lock, flags); | |
296 | ret = __irq_prepare_move(irq, cpu); | |
297 | spin_unlock_irqrestore(&vector_lock, flags); | |
298 | return ret; | |
299 | } | |
300 | ||
301 | void irq_complete_move(unsigned irq) | |
302 | { | |
303 | struct irq_cfg *cfg = &irq_cfg[irq]; | |
304 | cpumask_t cleanup_mask; | |
305 | int i; | |
306 | ||
307 | if (likely(!cfg->move_in_progress)) | |
308 | return; | |
309 | ||
5d2068da | 310 | if (unlikely(cpumask_test_cpu(smp_processor_id(), &cfg->old_domain))) |
a6cd6322 KK |
311 | return; |
312 | ||
7d7f9848 | 313 | cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask); |
5d2068da RR |
314 | cfg->move_cleanup_count = cpumask_weight(&cleanup_mask); |
315 | for_each_cpu(i, &cleanup_mask) | |
a6cd6322 KK |
316 | platform_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0); |
317 | cfg->move_in_progress = 0; | |
318 | } | |
319 | ||
320 | static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id) | |
321 | { | |
322 | int me = smp_processor_id(); | |
323 | ia64_vector vector; | |
324 | unsigned long flags; | |
325 | ||
326 | for (vector = IA64_FIRST_DEVICE_VECTOR; | |
327 | vector < IA64_LAST_DEVICE_VECTOR; vector++) { | |
328 | int irq; | |
329 | struct irq_desc *desc; | |
330 | struct irq_cfg *cfg; | |
6065a244 | 331 | irq = __this_cpu_read(vector_irq[vector]); |
a6cd6322 KK |
332 | if (irq < 0) |
333 | continue; | |
334 | ||
a2178334 | 335 | desc = irq_to_desc(irq); |
a6cd6322 | 336 | cfg = irq_cfg + irq; |
239007b8 | 337 | raw_spin_lock(&desc->lock); |
a6cd6322 KK |
338 | if (!cfg->move_cleanup_count) |
339 | goto unlock; | |
340 | ||
5d2068da | 341 | if (!cpumask_test_cpu(me, &cfg->old_domain)) |
a6cd6322 KK |
342 | goto unlock; |
343 | ||
344 | spin_lock_irqsave(&vector_lock, flags); | |
6065a244 | 345 | __this_cpu_write(vector_irq[vector], -1); |
5d2068da | 346 | cpumask_clear_cpu(me, &vector_table[vector]); |
a6cd6322 KK |
347 | spin_unlock_irqrestore(&vector_lock, flags); |
348 | cfg->move_cleanup_count--; | |
349 | unlock: | |
239007b8 | 350 | raw_spin_unlock(&desc->lock); |
a6cd6322 KK |
351 | } |
352 | return IRQ_HANDLED; | |
353 | } | |
354 | ||
355 | static struct irqaction irq_move_irqaction = { | |
356 | .handler = smp_irq_move_cleanup_interrupt, | |
a6cd6322 KK |
357 | .name = "irq_move" |
358 | }; | |
359 | ||
d080d397 YI |
360 | static int __init parse_vector_domain(char *arg) |
361 | { | |
362 | if (!arg) | |
363 | return -EINVAL; | |
364 | if (!strcmp(arg, "percpu")) { | |
365 | vector_domain_type = VECTOR_DOMAIN_PERCPU; | |
366 | no_int_routing = 1; | |
367 | } | |
074ff856 | 368 | return 0; |
d080d397 YI |
369 | } |
370 | early_param("vector", parse_vector_domain); | |
371 | #else | |
372 | static cpumask_t vector_allocation_domain(int cpu) | |
373 | { | |
374 | return CPU_MASK_ALL; | |
375 | } | |
376 | #endif | |
377 | ||
4994be1b | 378 | |
e1b30a39 YI |
379 | void destroy_and_reserve_irq(unsigned int irq) |
380 | { | |
216fcd29 KK |
381 | unsigned long flags; |
382 | ||
4debd723 | 383 | irq_init_desc(irq); |
216fcd29 KK |
384 | spin_lock_irqsave(&vector_lock, flags); |
385 | __clear_irq_vector(irq); | |
386 | irq_status[irq] = IRQ_RSVD; | |
387 | spin_unlock_irqrestore(&vector_lock, flags); | |
10083072 MM |
388 | } |
389 | ||
b6cf2583 EB |
390 | /* |
391 | * Dynamic irq allocate and deallocation for MSI | |
392 | */ | |
393 | int create_irq(void) | |
394 | { | |
e1b30a39 | 395 | unsigned long flags; |
4994be1b | 396 | int irq, vector, cpu; |
373167e8 | 397 | cpumask_t domain = CPU_MASK_NONE; |
e1b30a39 | 398 | |
4994be1b | 399 | irq = vector = -ENOSPC; |
e1b30a39 | 400 | spin_lock_irqsave(&vector_lock, flags); |
4994be1b YI |
401 | for_each_online_cpu(cpu) { |
402 | domain = vector_allocation_domain(cpu); | |
403 | vector = find_unassigned_vector(domain); | |
404 | if (vector >= 0) | |
405 | break; | |
406 | } | |
e1b30a39 YI |
407 | if (vector < 0) |
408 | goto out; | |
409 | irq = find_unassigned_irq(); | |
410 | if (irq < 0) | |
411 | goto out; | |
4994be1b | 412 | BUG_ON(__bind_irq_vector(irq, vector, domain)); |
e1b30a39 YI |
413 | out: |
414 | spin_unlock_irqrestore(&vector_lock, flags); | |
415 | if (irq >= 0) | |
4debd723 | 416 | irq_init_desc(irq); |
e1b30a39 | 417 | return irq; |
b6cf2583 EB |
418 | } |
419 | ||
420 | void destroy_irq(unsigned int irq) | |
421 | { | |
4debd723 | 422 | irq_init_desc(irq); |
e1b30a39 | 423 | clear_irq_vector(irq); |
b6cf2583 EB |
424 | } |
425 | ||
1da177e4 LT |
426 | #ifdef CONFIG_SMP |
427 | # define IS_RESCHEDULE(vec) (vec == IA64_IPI_RESCHEDULE) | |
3be44b9c | 428 | # define IS_LOCAL_TLB_FLUSH(vec) (vec == IA64_IPI_LOCAL_TLB_FLUSH) |
1da177e4 LT |
429 | #else |
430 | # define IS_RESCHEDULE(vec) (0) | |
3be44b9c | 431 | # define IS_LOCAL_TLB_FLUSH(vec) (0) |
1da177e4 LT |
432 | #endif |
433 | /* | |
434 | * That's where the IVT branches when we get an external | |
435 | * interrupt. This branches to the correct hardware IRQ handler via | |
436 | * function ptr. | |
437 | */ | |
438 | void | |
439 | ia64_handle_irq (ia64_vector vector, struct pt_regs *regs) | |
440 | { | |
7d12e780 | 441 | struct pt_regs *old_regs = set_irq_regs(regs); |
1da177e4 LT |
442 | unsigned long saved_tpr; |
443 | ||
444 | #if IRQ_DEBUG | |
445 | { | |
446 | unsigned long bsp, sp; | |
447 | ||
448 | /* | |
449 | * Note: if the interrupt happened while executing in | |
450 | * the context switch routine (ia64_switch_to), we may | |
451 | * get a spurious stack overflow here. This is | |
452 | * because the register and the memory stack are not | |
453 | * switched atomically. | |
454 | */ | |
455 | bsp = ia64_getreg(_IA64_REG_AR_BSP); | |
456 | sp = ia64_getreg(_IA64_REG_SP); | |
457 | ||
458 | if ((sp - bsp) < 1024) { | |
7683a3f9 | 459 | static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5); |
1da177e4 | 460 | |
7683a3f9 | 461 | if (__ratelimit(&ratelimit)) { |
1da177e4 LT |
462 | printk("ia64_handle_irq: DANGER: less than " |
463 | "1KB of free stack space!!\n" | |
464 | "(bsp=0x%lx, sp=%lx)\n", bsp, sp); | |
465 | } | |
466 | } | |
467 | } | |
468 | #endif /* IRQ_DEBUG */ | |
469 | ||
470 | /* | |
471 | * Always set TPR to limit maximum interrupt nesting depth to | |
472 | * 16 (without this, it would be ~240, which could easily lead | |
473 | * to kernel stack overflows). | |
474 | */ | |
475 | irq_enter(); | |
476 | saved_tpr = ia64_getreg(_IA64_REG_CR_TPR); | |
477 | ia64_srlz_d(); | |
478 | while (vector != IA64_SPURIOUS_INT_VECTOR) { | |
66f3e6af JS |
479 | int irq = local_vector_to_irq(vector); |
480 | ||
3be44b9c JS |
481 | if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) { |
482 | smp_local_flush_tlb(); | |
3611587a | 483 | kstat_incr_irq_this_cpu(irq); |
7c730ccd | 484 | } else if (unlikely(IS_RESCHEDULE(vector))) { |
184748cc | 485 | scheduler_ipi(); |
3611587a | 486 | kstat_incr_irq_this_cpu(irq); |
7c730ccd | 487 | } else { |
1da177e4 LT |
488 | ia64_setreg(_IA64_REG_CR_TPR, vector); |
489 | ia64_srlz_d(); | |
490 | ||
17764d24 KK |
491 | if (unlikely(irq < 0)) { |
492 | printk(KERN_ERR "%s: Unexpected interrupt " | |
493 | "vector %d on CPU %d is not mapped " | |
d4ed8084 | 494 | "to any IRQ!\n", __func__, vector, |
17764d24 KK |
495 | smp_processor_id()); |
496 | } else | |
497 | generic_handle_irq(irq); | |
1da177e4 LT |
498 | |
499 | /* | |
500 | * Disable interrupts and send EOI: | |
501 | */ | |
502 | local_irq_disable(); | |
503 | ia64_setreg(_IA64_REG_CR_TPR, saved_tpr); | |
504 | } | |
505 | ia64_eoi(); | |
506 | vector = ia64_get_ivr(); | |
507 | } | |
508 | /* | |
509 | * This must be done *after* the ia64_eoi(). For example, the keyboard softirq | |
510 | * handler needs to be able to wait for further keyboard interrupts, which can't | |
511 | * come through until ia64_eoi() has been done. | |
512 | */ | |
513 | irq_exit(); | |
7d12e780 | 514 | set_irq_regs(old_regs); |
1da177e4 LT |
515 | } |
516 | ||
517 | #ifdef CONFIG_HOTPLUG_CPU | |
518 | /* | |
519 | * This function emulates a interrupt processing when a cpu is about to be | |
520 | * brought down. | |
521 | */ | |
522 | void ia64_process_pending_intr(void) | |
523 | { | |
524 | ia64_vector vector; | |
525 | unsigned long saved_tpr; | |
526 | extern unsigned int vectors_in_migration[NR_IRQS]; | |
527 | ||
528 | vector = ia64_get_ivr(); | |
529 | ||
66f3e6af JS |
530 | irq_enter(); |
531 | saved_tpr = ia64_getreg(_IA64_REG_CR_TPR); | |
532 | ia64_srlz_d(); | |
1da177e4 LT |
533 | |
534 | /* | |
535 | * Perform normal interrupt style processing | |
536 | */ | |
537 | while (vector != IA64_SPURIOUS_INT_VECTOR) { | |
66f3e6af | 538 | int irq = local_vector_to_irq(vector); |
66f3e6af | 539 | |
3be44b9c JS |
540 | if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) { |
541 | smp_local_flush_tlb(); | |
3611587a | 542 | kstat_incr_irq_this_cpu(irq); |
7c730ccd | 543 | } else if (unlikely(IS_RESCHEDULE(vector))) { |
3611587a | 544 | kstat_incr_irq_this_cpu(irq); |
7c730ccd | 545 | } else { |
8c1addbc TL |
546 | struct pt_regs *old_regs = set_irq_regs(NULL); |
547 | ||
1da177e4 LT |
548 | ia64_setreg(_IA64_REG_CR_TPR, vector); |
549 | ia64_srlz_d(); | |
550 | ||
551 | /* | |
552 | * Now try calling normal ia64_handle_irq as it would have got called | |
553 | * from a real intr handler. Try passing null for pt_regs, hopefully | |
554 | * it will work. I hope it works!. | |
555 | * Probably could shared code. | |
556 | */ | |
17764d24 KK |
557 | if (unlikely(irq < 0)) { |
558 | printk(KERN_ERR "%s: Unexpected interrupt " | |
559 | "vector %d on CPU %d not being mapped " | |
d4ed8084 | 560 | "to any IRQ!!\n", __func__, vector, |
17764d24 KK |
561 | smp_processor_id()); |
562 | } else { | |
563 | vectors_in_migration[irq]=0; | |
564 | generic_handle_irq(irq); | |
565 | } | |
8c1addbc | 566 | set_irq_regs(old_regs); |
1da177e4 LT |
567 | |
568 | /* | |
569 | * Disable interrupts and send EOI | |
570 | */ | |
571 | local_irq_disable(); | |
572 | ia64_setreg(_IA64_REG_CR_TPR, saved_tpr); | |
573 | } | |
574 | ia64_eoi(); | |
575 | vector = ia64_get_ivr(); | |
576 | } | |
577 | irq_exit(); | |
578 | } | |
579 | #endif | |
580 | ||
581 | ||
582 | #ifdef CONFIG_SMP | |
1da177e4 | 583 | |
9b3377f9 JS |
584 | static irqreturn_t dummy_handler (int irq, void *dev_id) |
585 | { | |
586 | BUG(); | |
587 | } | |
588 | ||
1da177e4 LT |
589 | static struct irqaction ipi_irqaction = { |
590 | .handler = handle_IPI, | |
1da177e4 LT |
591 | .name = "IPI" |
592 | }; | |
9b3377f9 | 593 | |
32f88400 MT |
594 | /* |
595 | * KVM uses this interrupt to force a cpu out of guest mode | |
596 | */ | |
9b3377f9 JS |
597 | static struct irqaction resched_irqaction = { |
598 | .handler = dummy_handler, | |
9b3377f9 JS |
599 | .name = "resched" |
600 | }; | |
3be44b9c JS |
601 | |
602 | static struct irqaction tlb_irqaction = { | |
603 | .handler = dummy_handler, | |
3be44b9c JS |
604 | .name = "tlb_flush" |
605 | }; | |
606 | ||
1da177e4 LT |
607 | #endif |
608 | ||
609 | void | |
85cbc503 | 610 | ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action) |
1da177e4 | 611 | { |
1da177e4 LT |
612 | unsigned int irq; |
613 | ||
e1b30a39 | 614 | irq = vec; |
4994be1b | 615 | BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL)); |
a2178334 | 616 | irq_set_status_flags(irq, IRQ_PER_CPU); |
53c909c9 | 617 | irq_set_chip(irq, &irq_type_ia64_lsapic); |
e1b30a39 YI |
618 | if (action) |
619 | setup_irq(irq, action); | |
53c909c9 | 620 | irq_set_handler(irq, handle_percpu_irq); |
1da177e4 LT |
621 | } |
622 | ||
623 | void __init | |
85cbc503 | 624 | ia64_native_register_ipi(void) |
1da177e4 | 625 | { |
1da177e4 LT |
626 | #ifdef CONFIG_SMP |
627 | register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction); | |
9b3377f9 | 628 | register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction); |
3be44b9c | 629 | register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction); |
85cbc503 IY |
630 | #endif |
631 | } | |
632 | ||
633 | void __init | |
634 | init_IRQ (void) | |
635 | { | |
4de0a759 TL |
636 | #ifdef CONFIG_ACPI |
637 | acpi_boot_init(); | |
638 | #endif | |
85cbc503 IY |
639 | ia64_register_ipi(); |
640 | register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL); | |
641 | #ifdef CONFIG_SMP | |
a6cd6322 | 642 | #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG) |
09b366b7 | 643 | if (vector_domain_type != VECTOR_DOMAIN_NONE) |
a6cd6322 | 644 | register_percpu_irq(IA64_IRQ_MOVE_VECTOR, &irq_move_irqaction); |
a6cd6322 | 645 | #endif |
1da177e4 LT |
646 | #endif |
647 | #ifdef CONFIG_PERFMON | |
648 | pfm_init_percpu(); | |
649 | #endif | |
650 | platform_irq_init(); | |
651 | } | |
652 | ||
653 | void | |
654 | ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect) | |
655 | { | |
656 | void __iomem *ipi_addr; | |
657 | unsigned long ipi_data; | |
658 | unsigned long phys_cpu_id; | |
659 | ||
1da177e4 | 660 | phys_cpu_id = cpu_physical_id(cpu); |
1da177e4 LT |
661 | |
662 | /* | |
663 | * cpu number is in 8bit ID and 8bit EID | |
664 | */ | |
665 | ||
666 | ipi_data = (delivery_mode << 8) | (vector & 0xff); | |
667 | ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3)); | |
668 | ||
669 | writeq(ipi_data, ipi_addr); | |
670 | } |