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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Derived from arch/i386/kernel/irq.c |
3 | * Copyright (C) 1992 Linus Torvalds | |
4 | * Adapted from arch/i386 by Gary Thomas | |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
756e7104 SR |
6 | * Updated and modified by Cort Dougan <cort@fsmlabs.com> |
7 | * Copyright (C) 1996-2001 Cort Dougan | |
1da177e4 LT |
8 | * Adapted for Power Macintosh by Paul Mackerras |
9 | * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) | |
756e7104 | 10 | * |
1da177e4 LT |
11 | * This program is free software; you can redistribute it and/or |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * This file contains the code used by various IRQ handling routines: | |
17 | * asking for different IRQ's should be done through these routines | |
18 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
19 | * shouldn't result in any weird surprises, and installing new handlers | |
20 | * should be easier. | |
756e7104 SR |
21 | * |
22 | * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the | |
23 | * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit | |
24 | * mask register (of which only 16 are defined), hence the weird shifting | |
25 | * and complement of the cached_irq_mask. I want to be able to stuff | |
26 | * this right into the SIU SMASK register. | |
27 | * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx | |
28 | * to reduce code space and undefined function references. | |
1da177e4 LT |
29 | */ |
30 | ||
0ebfff14 BH |
31 | #undef DEBUG |
32 | ||
4b16f8e2 | 33 | #include <linux/export.h> |
1da177e4 LT |
34 | #include <linux/threads.h> |
35 | #include <linux/kernel_stat.h> | |
36 | #include <linux/signal.h> | |
37 | #include <linux/sched.h> | |
756e7104 | 38 | #include <linux/ptrace.h> |
1da177e4 LT |
39 | #include <linux/ioport.h> |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/timex.h> | |
1da177e4 LT |
42 | #include <linux/init.h> |
43 | #include <linux/slab.h> | |
1da177e4 LT |
44 | #include <linux/delay.h> |
45 | #include <linux/irq.h> | |
756e7104 SR |
46 | #include <linux/seq_file.h> |
47 | #include <linux/cpumask.h> | |
1da177e4 LT |
48 | #include <linux/profile.h> |
49 | #include <linux/bitops.h> | |
0ebfff14 BH |
50 | #include <linux/list.h> |
51 | #include <linux/radix-tree.h> | |
52 | #include <linux/mutex.h> | |
45934c47 | 53 | #include <linux/pci.h> |
60b332e7 | 54 | #include <linux/debugfs.h> |
e3873444 GL |
55 | #include <linux/of.h> |
56 | #include <linux/of_irq.h> | |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
1da177e4 LT |
59 | #include <asm/io.h> |
60 | #include <asm/pgtable.h> | |
61 | #include <asm/irq.h> | |
62 | #include <asm/cache.h> | |
63 | #include <asm/prom.h> | |
64 | #include <asm/ptrace.h> | |
1da177e4 | 65 | #include <asm/machdep.h> |
0ebfff14 | 66 | #include <asm/udbg.h> |
3e7f45ad | 67 | #include <asm/smp.h> |
ae3a197e | 68 | #include <asm/debug.h> |
5d31a96e | 69 | #include <asm/livepatch.h> |
89c81797 | 70 | |
d04c56f7 | 71 | #ifdef CONFIG_PPC64 |
1da177e4 | 72 | #include <asm/paca.h> |
d04c56f7 | 73 | #include <asm/firmware.h> |
0874dd40 | 74 | #include <asm/lv1call.h> |
756e7104 | 75 | #endif |
1bf4af16 AB |
76 | #define CREATE_TRACE_POINTS |
77 | #include <asm/trace.h> | |
1da177e4 | 78 | |
8c007bfd AB |
79 | DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); |
80 | EXPORT_PER_CPU_SYMBOL(irq_stat); | |
81 | ||
868accb7 | 82 | int __irq_offset_value; |
756e7104 | 83 | |
756e7104 | 84 | #ifdef CONFIG_PPC32 |
b9e5b4e6 BH |
85 | EXPORT_SYMBOL(__irq_offset_value); |
86 | atomic_t ppc_n_lost_interrupts; | |
756e7104 | 87 | |
756e7104 SR |
88 | #ifdef CONFIG_TAU_INT |
89 | extern int tau_initialized; | |
90 | extern int tau_interrupts(int); | |
91 | #endif | |
b9e5b4e6 | 92 | #endif /* CONFIG_PPC32 */ |
756e7104 | 93 | |
756e7104 | 94 | #ifdef CONFIG_PPC64 |
cd015707 | 95 | |
1da177e4 | 96 | int distribute_irqs = 1; |
d04c56f7 | 97 | |
7230c564 | 98 | static inline notrace unsigned long get_irq_happened(void) |
ef2b343e | 99 | { |
7230c564 | 100 | unsigned long happened; |
ef2b343e HD |
101 | |
102 | __asm__ __volatile__("lbz %0,%1(13)" | |
7230c564 | 103 | : "=r" (happened) : "i" (offsetof(struct paca_struct, irq_happened))); |
ef2b343e | 104 | |
7230c564 | 105 | return happened; |
ef2b343e HD |
106 | } |
107 | ||
4e491d14 | 108 | static inline notrace void set_soft_enabled(unsigned long enable) |
ef2b343e HD |
109 | { |
110 | __asm__ __volatile__("stb %0,%1(13)" | |
111 | : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled))); | |
112 | } | |
113 | ||
7230c564 | 114 | static inline notrace int decrementer_check_overflow(void) |
7df10275 | 115 | { |
7230c564 | 116 | u64 now = get_tb_or_rtc(); |
69111bac | 117 | u64 *next_tb = this_cpu_ptr(&decrementers_next_tb); |
7230c564 | 118 | |
7230c564 | 119 | return now >= *next_tb; |
7df10275 AB |
120 | } |
121 | ||
7230c564 | 122 | /* This is called whenever we are re-enabling interrupts |
fe9e1d54 IM |
123 | * and returns either 0 (nothing to do) or 500/900/280/a00/e80 if |
124 | * there's an EE, DEC or DBELL to generate. | |
7230c564 BH |
125 | * |
126 | * This is called in two contexts: From arch_local_irq_restore() | |
127 | * before soft-enabling interrupts, and from the exception exit | |
128 | * path when returning from an interrupt from a soft-disabled to | |
129 | * a soft enabled context. In both case we have interrupts hard | |
130 | * disabled. | |
131 | * | |
132 | * We take care of only clearing the bits we handled in the | |
133 | * PACA irq_happened field since we can only re-emit one at a | |
134 | * time and we don't want to "lose" one. | |
135 | */ | |
136 | notrace unsigned int __check_irq_replay(void) | |
d04c56f7 | 137 | { |
ef2b343e | 138 | /* |
7230c564 BH |
139 | * We use local_paca rather than get_paca() to avoid all |
140 | * the debug_smp_processor_id() business in this low level | |
141 | * function | |
ef2b343e | 142 | */ |
7230c564 | 143 | unsigned char happened = local_paca->irq_happened; |
d04c56f7 | 144 | |
7230c564 BH |
145 | /* Clear bit 0 which we wouldn't clear otherwise */ |
146 | local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; | |
147 | ||
148 | /* | |
149 | * Force the delivery of pending soft-disabled interrupts on PS3. | |
150 | * Any HV call will have this side effect. | |
151 | */ | |
152 | if (firmware_has_feature(FW_FEATURE_PS3_LV1)) { | |
153 | u64 tmp, tmp2; | |
154 | lv1_get_version_info(&tmp, &tmp2); | |
d04c56f7 PM |
155 | } |
156 | ||
ef2b343e | 157 | /* |
7230c564 BH |
158 | * We may have missed a decrementer interrupt. We check the |
159 | * decrementer itself rather than the paca irq_happened field | |
160 | * in case we also had a rollover while hard disabled | |
161 | */ | |
162 | local_paca->irq_happened &= ~PACA_IRQ_DEC; | |
230b3034 | 163 | if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow()) |
7230c564 BH |
164 | return 0x900; |
165 | ||
166 | /* Finally check if an external interrupt happened */ | |
167 | local_paca->irq_happened &= ~PACA_IRQ_EE; | |
168 | if (happened & PACA_IRQ_EE) | |
169 | return 0x500; | |
170 | ||
171 | #ifdef CONFIG_PPC_BOOK3E | |
172 | /* Finally check if an EPR external interrupt happened | |
173 | * this bit is typically set if we need to handle another | |
174 | * "edge" interrupt from within the MPIC "EPR" handler | |
ef2b343e | 175 | */ |
7230c564 BH |
176 | local_paca->irq_happened &= ~PACA_IRQ_EE_EDGE; |
177 | if (happened & PACA_IRQ_EE_EDGE) | |
178 | return 0x500; | |
179 | ||
180 | local_paca->irq_happened &= ~PACA_IRQ_DBELL; | |
181 | if (happened & PACA_IRQ_DBELL) | |
182 | return 0x280; | |
fe9e1d54 IM |
183 | #else |
184 | local_paca->irq_happened &= ~PACA_IRQ_DBELL; | |
185 | if (happened & PACA_IRQ_DBELL) { | |
186 | if (cpu_has_feature(CPU_FTR_HVMODE)) | |
187 | return 0xe80; | |
188 | return 0xa00; | |
189 | } | |
7230c564 BH |
190 | #endif /* CONFIG_PPC_BOOK3E */ |
191 | ||
0869b6fd MS |
192 | /* Check if an hypervisor Maintenance interrupt happened */ |
193 | local_paca->irq_happened &= ~PACA_IRQ_HMI; | |
194 | if (happened & PACA_IRQ_HMI) | |
195 | return 0xe60; | |
196 | ||
7230c564 BH |
197 | /* There should be nothing left ! */ |
198 | BUG_ON(local_paca->irq_happened != 0); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | notrace void arch_local_irq_restore(unsigned long en) | |
204 | { | |
205 | unsigned char irq_happened; | |
206 | unsigned int replay; | |
207 | ||
208 | /* Write the new soft-enabled value */ | |
209 | set_soft_enabled(en); | |
210 | if (!en) | |
211 | return; | |
212 | /* | |
213 | * From this point onward, we can take interrupts, preempt, | |
214 | * etc... unless we got hard-disabled. We check if an event | |
215 | * happened. If none happened, we know we can just return. | |
216 | * | |
217 | * We may have preempted before the check below, in which case | |
218 | * we are checking the "new" CPU instead of the old one. This | |
219 | * is only a problem if an event happened on the "old" CPU. | |
220 | * | |
1d9a4731 SR |
221 | * External interrupt events will have caused interrupts to |
222 | * be hard-disabled, so there is no problem, we | |
7230c564 | 223 | * cannot have preempted. |
ef2b343e | 224 | */ |
7230c564 BH |
225 | irq_happened = get_irq_happened(); |
226 | if (!irq_happened) | |
d04c56f7 | 227 | return; |
ef2b343e HD |
228 | |
229 | /* | |
7230c564 BH |
230 | * We need to hard disable to get a trusted value from |
231 | * __check_irq_replay(). We also need to soft-disable | |
232 | * again to avoid warnings in there due to the use of | |
233 | * per-cpu variables. | |
234 | * | |
235 | * We know that if the value in irq_happened is exactly 0x01 | |
236 | * then we are already hard disabled (there are other less | |
237 | * common cases that we'll ignore for now), so we skip the | |
238 | * (expensive) mtmsrd. | |
ef2b343e | 239 | */ |
7230c564 BH |
240 | if (unlikely(irq_happened != PACA_IRQ_HARD_DIS)) |
241 | __hard_irq_disable(); | |
21b2de34 | 242 | #ifdef CONFIG_TRACE_IRQFLAGS |
7c0482e3 BH |
243 | else { |
244 | /* | |
245 | * We should already be hard disabled here. We had bugs | |
246 | * where that wasn't the case so let's dbl check it and | |
247 | * warn if we are wrong. Only do that when IRQ tracing | |
248 | * is enabled as mfmsr() can be costly. | |
249 | */ | |
250 | if (WARN_ON(mfmsr() & MSR_EE)) | |
251 | __hard_irq_disable(); | |
252 | } | |
fa2cff3f | 253 | #endif /* CONFIG_TRACE_IRQFLAGS */ |
7c0482e3 | 254 | |
7230c564 | 255 | set_soft_enabled(0); |
e8775d4a | 256 | |
37fb9a02 | 257 | /* |
7230c564 BH |
258 | * Check if anything needs to be re-emitted. We haven't |
259 | * soft-enabled yet to avoid warnings in decrementer_check_overflow | |
260 | * accessing per-cpu variables | |
e8775d4a | 261 | */ |
7230c564 BH |
262 | replay = __check_irq_replay(); |
263 | ||
264 | /* We can soft-enable now */ | |
265 | set_soft_enabled(1); | |
0874dd40 TS |
266 | |
267 | /* | |
7230c564 BH |
268 | * And replay if we have to. This will return with interrupts |
269 | * hard-enabled. | |
0874dd40 | 270 | */ |
7230c564 BH |
271 | if (replay) { |
272 | __replay_interrupt(replay); | |
273 | return; | |
0874dd40 TS |
274 | } |
275 | ||
7230c564 | 276 | /* Finally, let's ensure we are hard enabled */ |
e1fa2e13 | 277 | __hard_irq_enable(); |
d04c56f7 | 278 | } |
df9ee292 | 279 | EXPORT_SYMBOL(arch_local_irq_restore); |
7230c564 BH |
280 | |
281 | /* | |
282 | * This is specifically called by assembly code to re-enable interrupts | |
283 | * if they are currently disabled. This is typically called before | |
284 | * schedule() or do_signal() when returning to userspace. We do it | |
285 | * in C to avoid the burden of dealing with lockdep etc... | |
56dfa7fa BH |
286 | * |
287 | * NOTE: This is called with interrupts hard disabled but not marked | |
288 | * as such in paca->irq_happened, so we need to resync this. | |
7230c564 | 289 | */ |
2d773aa4 | 290 | void notrace restore_interrupts(void) |
7230c564 | 291 | { |
56dfa7fa BH |
292 | if (irqs_disabled()) { |
293 | local_paca->irq_happened |= PACA_IRQ_HARD_DIS; | |
7230c564 | 294 | local_irq_enable(); |
56dfa7fa BH |
295 | } else |
296 | __hard_irq_enable(); | |
7230c564 BH |
297 | } |
298 | ||
be2cf20a BH |
299 | /* |
300 | * This is a helper to use when about to go into idle low-power | |
301 | * when the latter has the side effect of re-enabling interrupts | |
302 | * (such as calling H_CEDE under pHyp). | |
303 | * | |
304 | * You call this function with interrupts soft-disabled (this is | |
305 | * already the case when ppc_md.power_save is called). The function | |
306 | * will return whether to enter power save or just return. | |
307 | * | |
308 | * In the former case, it will have notified lockdep of interrupts | |
309 | * being re-enabled and generally sanitized the lazy irq state, | |
310 | * and in the latter case it will leave with interrupts hard | |
311 | * disabled and marked as such, so the local_irq_enable() call | |
0d2b7ea9 | 312 | * in arch_cpu_idle() will properly re-enable everything. |
be2cf20a BH |
313 | */ |
314 | bool prep_irq_for_idle(void) | |
315 | { | |
316 | /* | |
317 | * First we need to hard disable to ensure no interrupt | |
318 | * occurs before we effectively enter the low power state | |
319 | */ | |
320 | hard_irq_disable(); | |
321 | ||
322 | /* | |
323 | * If anything happened while we were soft-disabled, | |
324 | * we return now and do not enter the low power state. | |
325 | */ | |
326 | if (lazy_irq_pending()) | |
327 | return false; | |
328 | ||
329 | /* Tell lockdep we are about to re-enable */ | |
330 | trace_hardirqs_on(); | |
331 | ||
332 | /* | |
333 | * Mark interrupts as soft-enabled and clear the | |
334 | * PACA_IRQ_HARD_DIS from the pending mask since we | |
335 | * are about to hard enable as well as a side effect | |
336 | * of entering the low power state. | |
337 | */ | |
338 | local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; | |
339 | local_paca->soft_enabled = 1; | |
340 | ||
341 | /* Tell the caller to enter the low power state */ | |
342 | return true; | |
343 | } | |
344 | ||
756e7104 | 345 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 346 | |
433c9c67 | 347 | int arch_show_interrupts(struct seq_file *p, int prec) |
c86845ed AB |
348 | { |
349 | int j; | |
350 | ||
351 | #if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT) | |
352 | if (tau_initialized) { | |
353 | seq_printf(p, "%*s: ", prec, "TAU"); | |
354 | for_each_online_cpu(j) | |
355 | seq_printf(p, "%10u ", tau_interrupts(j)); | |
356 | seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n"); | |
357 | } | |
358 | #endif /* CONFIG_PPC32 && CONFIG_TAU_INT */ | |
359 | ||
89713ed1 AB |
360 | seq_printf(p, "%*s: ", prec, "LOC"); |
361 | for_each_online_cpu(j) | |
c041cfa2 | 362 | seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_event); |
363 | seq_printf(p, " Local timer interrupts for timer event device\n"); | |
364 | ||
365 | seq_printf(p, "%*s: ", prec, "LOC"); | |
366 | for_each_online_cpu(j) | |
367 | seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_others); | |
368 | seq_printf(p, " Local timer interrupts for others\n"); | |
89713ed1 | 369 | |
17081102 AB |
370 | seq_printf(p, "%*s: ", prec, "SPU"); |
371 | for_each_online_cpu(j) | |
372 | seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs); | |
373 | seq_printf(p, " Spurious interrupts\n"); | |
374 | ||
e8e813ed | 375 | seq_printf(p, "%*s: ", prec, "PMI"); |
89713ed1 AB |
376 | for_each_online_cpu(j) |
377 | seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs); | |
378 | seq_printf(p, " Performance monitoring interrupts\n"); | |
379 | ||
380 | seq_printf(p, "%*s: ", prec, "MCE"); | |
381 | for_each_online_cpu(j) | |
382 | seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions); | |
383 | seq_printf(p, " Machine check exceptions\n"); | |
384 | ||
0869b6fd MS |
385 | if (cpu_has_feature(CPU_FTR_HVMODE)) { |
386 | seq_printf(p, "%*s: ", prec, "HMI"); | |
387 | for_each_online_cpu(j) | |
388 | seq_printf(p, "%10u ", | |
389 | per_cpu(irq_stat, j).hmi_exceptions); | |
390 | seq_printf(p, " Hypervisor Maintenance Interrupts\n"); | |
391 | } | |
392 | ||
a6a058e5 IM |
393 | #ifdef CONFIG_PPC_DOORBELL |
394 | if (cpu_has_feature(CPU_FTR_DBELL)) { | |
395 | seq_printf(p, "%*s: ", prec, "DBL"); | |
396 | for_each_online_cpu(j) | |
397 | seq_printf(p, "%10u ", per_cpu(irq_stat, j).doorbell_irqs); | |
398 | seq_printf(p, " Doorbell interrupts\n"); | |
399 | } | |
400 | #endif | |
401 | ||
c86845ed AB |
402 | return 0; |
403 | } | |
404 | ||
89713ed1 AB |
405 | /* |
406 | * /proc/stat helpers | |
407 | */ | |
408 | u64 arch_irq_stat_cpu(unsigned int cpu) | |
409 | { | |
c041cfa2 | 410 | u64 sum = per_cpu(irq_stat, cpu).timer_irqs_event; |
89713ed1 AB |
411 | |
412 | sum += per_cpu(irq_stat, cpu).pmu_irqs; | |
413 | sum += per_cpu(irq_stat, cpu).mce_exceptions; | |
17081102 | 414 | sum += per_cpu(irq_stat, cpu).spurious_irqs; |
c041cfa2 | 415 | sum += per_cpu(irq_stat, cpu).timer_irqs_others; |
0869b6fd | 416 | sum += per_cpu(irq_stat, cpu).hmi_exceptions; |
a6a058e5 IM |
417 | #ifdef CONFIG_PPC_DOORBELL |
418 | sum += per_cpu(irq_stat, cpu).doorbell_irqs; | |
419 | #endif | |
89713ed1 AB |
420 | |
421 | return sum; | |
422 | } | |
423 | ||
1da177e4 | 424 | #ifdef CONFIG_HOTPLUG_CPU |
1c91cc57 | 425 | void migrate_irqs(void) |
1da177e4 | 426 | { |
6cff46f4 | 427 | struct irq_desc *desc; |
1da177e4 LT |
428 | unsigned int irq; |
429 | static int warned; | |
b6decb70 | 430 | cpumask_var_t mask; |
1c91cc57 | 431 | const struct cpumask *map = cpu_online_mask; |
1da177e4 | 432 | |
b6decb70 | 433 | alloc_cpumask_var(&mask, GFP_KERNEL); |
1da177e4 | 434 | |
4013369f | 435 | for_each_irq_desc(irq, desc) { |
7bfbc1f2 | 436 | struct irq_data *data; |
e1180287 LB |
437 | struct irq_chip *chip; |
438 | ||
7bfbc1f2 TG |
439 | data = irq_desc_get_irq_data(desc); |
440 | if (irqd_is_per_cpu(data)) | |
1da177e4 LT |
441 | continue; |
442 | ||
7bfbc1f2 | 443 | chip = irq_data_get_irq_chip(data); |
e1180287 | 444 | |
da92b4eb | 445 | cpumask_and(mask, irq_data_get_affinity_mask(data), map); |
b6decb70 | 446 | if (cpumask_any(mask) >= nr_cpu_ids) { |
a7696b36 | 447 | pr_warn("Breaking affinity for irq %i\n", irq); |
b6decb70 | 448 | cpumask_copy(mask, map); |
1da177e4 | 449 | } |
e1180287 | 450 | if (chip->irq_set_affinity) |
7bfbc1f2 | 451 | chip->irq_set_affinity(data, mask, true); |
6cff46f4 | 452 | else if (desc->action && !(warned++)) |
a7696b36 | 453 | pr_err("Cannot set affinity for irq %i\n", irq); |
1da177e4 LT |
454 | } |
455 | ||
b6decb70 AB |
456 | free_cpumask_var(mask); |
457 | ||
1da177e4 LT |
458 | local_irq_enable(); |
459 | mdelay(1); | |
460 | local_irq_disable(); | |
461 | } | |
462 | #endif | |
463 | ||
d7cb10d6 ME |
464 | static inline void check_stack_overflow(void) |
465 | { | |
466 | #ifdef CONFIG_DEBUG_STACKOVERFLOW | |
467 | long sp; | |
468 | ||
acf620ec | 469 | sp = current_stack_pointer() & (THREAD_SIZE-1); |
d7cb10d6 ME |
470 | |
471 | /* check for stack overflow: is there less than 2KB free? */ | |
472 | if (unlikely(sp < (sizeof(struct thread_info) + 2048))) { | |
a7696b36 | 473 | pr_err("do_IRQ: stack overflow: %ld\n", |
d7cb10d6 ME |
474 | sp - sizeof(struct thread_info)); |
475 | dump_stack(); | |
476 | } | |
477 | #endif | |
478 | } | |
479 | ||
0366a1c7 | 480 | void __do_irq(struct pt_regs *regs) |
1da177e4 | 481 | { |
0ebfff14 | 482 | unsigned int irq; |
1da177e4 | 483 | |
4b218e9b | 484 | irq_enter(); |
1da177e4 | 485 | |
e72bbbab LZ |
486 | trace_irq_entry(regs); |
487 | ||
d7cb10d6 | 488 | check_stack_overflow(); |
1da177e4 | 489 | |
7230c564 BH |
490 | /* |
491 | * Query the platform PIC for the interrupt & ack it. | |
492 | * | |
493 | * This will typically lower the interrupt line to the CPU | |
494 | */ | |
35a84c2f | 495 | irq = ppc_md.get_irq(); |
1da177e4 | 496 | |
0366a1c7 | 497 | /* We can hard enable interrupts now to allow perf interrupts */ |
7230c564 BH |
498 | may_hard_irq_enable(); |
499 | ||
500 | /* And finally process it */ | |
0366a1c7 | 501 | if (unlikely(irq == NO_IRQ)) |
69111bac | 502 | __this_cpu_inc(irq_stat.spurious_irqs); |
a4e04c9f TG |
503 | else |
504 | generic_handle_irq(irq); | |
e199500c | 505 | |
e72bbbab LZ |
506 | trace_irq_exit(regs); |
507 | ||
4b218e9b | 508 | irq_exit(); |
0366a1c7 BH |
509 | } |
510 | ||
511 | void do_IRQ(struct pt_regs *regs) | |
512 | { | |
513 | struct pt_regs *old_regs = set_irq_regs(regs); | |
8b5ede69 | 514 | struct thread_info *curtp, *irqtp, *sirqtp; |
0366a1c7 BH |
515 | |
516 | /* Switch to the irq stack to handle this */ | |
517 | curtp = current_thread_info(); | |
518 | irqtp = hardirq_ctx[raw_smp_processor_id()]; | |
8b5ede69 | 519 | sirqtp = softirq_ctx[raw_smp_processor_id()]; |
0366a1c7 BH |
520 | |
521 | /* Already there ? */ | |
8b5ede69 | 522 | if (unlikely(curtp == irqtp || curtp == sirqtp)) { |
0366a1c7 BH |
523 | __do_irq(regs); |
524 | set_irq_regs(old_regs); | |
525 | return; | |
526 | } | |
527 | ||
0366a1c7 BH |
528 | /* Prepare the thread_info in the irq stack */ |
529 | irqtp->task = curtp->task; | |
530 | irqtp->flags = 0; | |
531 | ||
532 | /* Copy the preempt_count so that the [soft]irq checks work. */ | |
533 | irqtp->preempt_count = curtp->preempt_count; | |
534 | ||
535 | /* Switch stack and call */ | |
536 | call_do_irq(regs, irqtp); | |
537 | ||
538 | /* Restore stack limit */ | |
0366a1c7 BH |
539 | irqtp->task = NULL; |
540 | ||
541 | /* Copy back updates to the thread_info */ | |
542 | if (irqtp->flags) | |
543 | set_bits(irqtp->flags, &curtp->flags); | |
544 | ||
7d12e780 | 545 | set_irq_regs(old_regs); |
e199500c | 546 | } |
1da177e4 LT |
547 | |
548 | void __init init_IRQ(void) | |
549 | { | |
70584578 SR |
550 | if (ppc_md.init_IRQ) |
551 | ppc_md.init_IRQ(); | |
bcf0b088 KG |
552 | |
553 | exc_lvl_ctx_init(); | |
554 | ||
1da177e4 LT |
555 | irq_ctx_init(); |
556 | } | |
557 | ||
bcf0b088 KG |
558 | #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) |
559 | struct thread_info *critirq_ctx[NR_CPUS] __read_mostly; | |
560 | struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly; | |
561 | struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly; | |
562 | ||
563 | void exc_lvl_ctx_init(void) | |
564 | { | |
565 | struct thread_info *tp; | |
ca1769f7 | 566 | int i, cpu_nr; |
bcf0b088 KG |
567 | |
568 | for_each_possible_cpu(i) { | |
ca1769f7 ME |
569 | #ifdef CONFIG_PPC64 |
570 | cpu_nr = i; | |
571 | #else | |
04a34113 | 572 | #ifdef CONFIG_SMP |
ca1769f7 | 573 | cpu_nr = get_hard_smp_processor_id(i); |
04a34113 KH |
574 | #else |
575 | cpu_nr = 0; | |
576 | #endif | |
ca1769f7 | 577 | #endif |
04a34113 | 578 | |
ca1769f7 ME |
579 | memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE); |
580 | tp = critirq_ctx[cpu_nr]; | |
581 | tp->cpu = cpu_nr; | |
bcf0b088 KG |
582 | tp->preempt_count = 0; |
583 | ||
584 | #ifdef CONFIG_BOOKE | |
ca1769f7 ME |
585 | memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE); |
586 | tp = dbgirq_ctx[cpu_nr]; | |
587 | tp->cpu = cpu_nr; | |
bcf0b088 KG |
588 | tp->preempt_count = 0; |
589 | ||
ca1769f7 ME |
590 | memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE); |
591 | tp = mcheckirq_ctx[cpu_nr]; | |
592 | tp->cpu = cpu_nr; | |
bcf0b088 KG |
593 | tp->preempt_count = HARDIRQ_OFFSET; |
594 | #endif | |
595 | } | |
596 | } | |
597 | #endif | |
1da177e4 | 598 | |
22722051 AM |
599 | struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; |
600 | struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly; | |
1da177e4 LT |
601 | |
602 | void irq_ctx_init(void) | |
603 | { | |
604 | struct thread_info *tp; | |
605 | int i; | |
606 | ||
0e551954 | 607 | for_each_possible_cpu(i) { |
1da177e4 LT |
608 | memset((void *)softirq_ctx[i], 0, THREAD_SIZE); |
609 | tp = softirq_ctx[i]; | |
610 | tp->cpu = i; | |
5d31a96e | 611 | klp_init_thread_info(tp); |
1da177e4 LT |
612 | |
613 | memset((void *)hardirq_ctx[i], 0, THREAD_SIZE); | |
614 | tp = hardirq_ctx[i]; | |
615 | tp->cpu = i; | |
5d31a96e | 616 | klp_init_thread_info(tp); |
1da177e4 LT |
617 | } |
618 | } | |
619 | ||
7d65f4a6 | 620 | void do_softirq_own_stack(void) |
c6622f63 PM |
621 | { |
622 | struct thread_info *curtp, *irqtp; | |
623 | ||
624 | curtp = current_thread_info(); | |
625 | irqtp = softirq_ctx[smp_processor_id()]; | |
626 | irqtp->task = curtp->task; | |
50d2a422 | 627 | irqtp->flags = 0; |
c6622f63 PM |
628 | call_do_softirq(irqtp); |
629 | irqtp->task = NULL; | |
50d2a422 BH |
630 | |
631 | /* Set any flag that may have been set on the | |
632 | * alternate stack | |
633 | */ | |
634 | if (irqtp->flags) | |
635 | set_bits(irqtp->flags, &curtp->flags); | |
c6622f63 | 636 | } |
1da177e4 | 637 | |
35923f12 OJ |
638 | irq_hw_number_t virq_to_hw(unsigned int virq) |
639 | { | |
4bbdd45a GL |
640 | struct irq_data *irq_data = irq_get_irq_data(virq); |
641 | return WARN_ON(!irq_data) ? 0 : irq_data->hwirq; | |
35923f12 OJ |
642 | } |
643 | EXPORT_SYMBOL_GPL(virq_to_hw); | |
644 | ||
6ec36b58 SY |
645 | #ifdef CONFIG_SMP |
646 | int irq_choose_cpu(const struct cpumask *mask) | |
647 | { | |
648 | int cpuid; | |
649 | ||
2074b1d9 | 650 | if (cpumask_equal(mask, cpu_online_mask)) { |
6ec36b58 SY |
651 | static int irq_rover; |
652 | static DEFINE_RAW_SPINLOCK(irq_rover_lock); | |
653 | unsigned long flags; | |
654 | ||
655 | /* Round-robin distribution... */ | |
656 | do_round_robin: | |
657 | raw_spin_lock_irqsave(&irq_rover_lock, flags); | |
658 | ||
659 | irq_rover = cpumask_next(irq_rover, cpu_online_mask); | |
660 | if (irq_rover >= nr_cpu_ids) | |
661 | irq_rover = cpumask_first(cpu_online_mask); | |
662 | ||
663 | cpuid = irq_rover; | |
664 | ||
665 | raw_spin_unlock_irqrestore(&irq_rover_lock, flags); | |
666 | } else { | |
667 | cpuid = cpumask_first_and(mask, cpu_online_mask); | |
668 | if (cpuid >= nr_cpu_ids) | |
669 | goto do_round_robin; | |
670 | } | |
671 | ||
672 | return get_hard_smp_processor_id(cpuid); | |
673 | } | |
674 | #else | |
675 | int irq_choose_cpu(const struct cpumask *mask) | |
676 | { | |
677 | return hard_smp_processor_id(); | |
678 | } | |
679 | #endif | |
0ebfff14 | 680 | |
cd015707 | 681 | int arch_early_irq_init(void) |
0ebfff14 | 682 | { |
cd015707 | 683 | return 0; |
0ebfff14 BH |
684 | } |
685 | ||
c6622f63 | 686 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
687 | static int __init setup_noirqdistrib(char *str) |
688 | { | |
689 | distribute_irqs = 0; | |
690 | return 1; | |
691 | } | |
692 | ||
693 | __setup("noirqdistrib", setup_noirqdistrib); | |
756e7104 | 694 | #endif /* CONFIG_PPC64 */ |