Commit | Line | Data |
---|---|---|
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) | |
10 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). | |
756e7104 | 11 | * |
1da177e4 LT |
12 | * This program is free software; you can redistribute it and/or |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | * This file contains the code used by various IRQ handling routines: | |
18 | * asking for different IRQ's should be done through these routines | |
19 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
20 | * shouldn't result in any weird surprises, and installing new handlers | |
21 | * should be easier. | |
756e7104 SR |
22 | * |
23 | * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the | |
24 | * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit | |
25 | * mask register (of which only 16 are defined), hence the weird shifting | |
26 | * and complement of the cached_irq_mask. I want to be able to stuff | |
27 | * this right into the SIU SMASK register. | |
28 | * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx | |
29 | * to reduce code space and undefined function references. | |
1da177e4 LT |
30 | */ |
31 | ||
1da177e4 LT |
32 | #include <linux/module.h> |
33 | #include <linux/threads.h> | |
34 | #include <linux/kernel_stat.h> | |
35 | #include <linux/signal.h> | |
36 | #include <linux/sched.h> | |
756e7104 | 37 | #include <linux/ptrace.h> |
1da177e4 LT |
38 | #include <linux/ioport.h> |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/timex.h> | |
1da177e4 LT |
41 | #include <linux/init.h> |
42 | #include <linux/slab.h> | |
1da177e4 LT |
43 | #include <linux/delay.h> |
44 | #include <linux/irq.h> | |
756e7104 SR |
45 | #include <linux/seq_file.h> |
46 | #include <linux/cpumask.h> | |
1da177e4 LT |
47 | #include <linux/profile.h> |
48 | #include <linux/bitops.h> | |
204face4 | 49 | #include <linux/pci.h> |
1da177e4 LT |
50 | |
51 | #include <asm/uaccess.h> | |
52 | #include <asm/system.h> | |
53 | #include <asm/io.h> | |
54 | #include <asm/pgtable.h> | |
55 | #include <asm/irq.h> | |
56 | #include <asm/cache.h> | |
57 | #include <asm/prom.h> | |
58 | #include <asm/ptrace.h> | |
1da177e4 | 59 | #include <asm/machdep.h> |
a50b56d2 | 60 | #ifdef CONFIG_PPC_ISERIES |
1da177e4 | 61 | #include <asm/paca.h> |
756e7104 | 62 | #endif |
1da177e4 | 63 | |
868accb7 | 64 | int __irq_offset_value; |
756e7104 SR |
65 | static int ppc_spurious_interrupts; |
66 | ||
756e7104 | 67 | #ifdef CONFIG_PPC32 |
b9e5b4e6 BH |
68 | EXPORT_SYMBOL(__irq_offset_value); |
69 | atomic_t ppc_n_lost_interrupts; | |
756e7104 | 70 | |
b9e5b4e6 BH |
71 | #ifndef CONFIG_PPC_MERGE |
72 | #define NR_MASK_WORDS ((NR_IRQS + 31) / 32) | |
756e7104 | 73 | unsigned long ppc_cached_irq_mask[NR_MASK_WORDS]; |
b9e5b4e6 | 74 | #endif |
756e7104 SR |
75 | |
76 | #ifdef CONFIG_TAU_INT | |
77 | extern int tau_initialized; | |
78 | extern int tau_interrupts(int); | |
79 | #endif | |
b9e5b4e6 | 80 | #endif /* CONFIG_PPC32 */ |
756e7104 SR |
81 | |
82 | #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE) | |
83 | extern atomic_t ipi_recv; | |
84 | extern atomic_t ipi_sent; | |
85 | #endif | |
756e7104 SR |
86 | |
87 | #ifdef CONFIG_PPC64 | |
1da177e4 LT |
88 | EXPORT_SYMBOL(irq_desc); |
89 | ||
90 | int distribute_irqs = 1; | |
1da177e4 | 91 | u64 ppc64_interrupt_controller; |
756e7104 | 92 | #endif /* CONFIG_PPC64 */ |
1da177e4 LT |
93 | |
94 | int show_interrupts(struct seq_file *p, void *v) | |
95 | { | |
756e7104 SR |
96 | int i = *(loff_t *)v, j; |
97 | struct irqaction *action; | |
1da177e4 LT |
98 | irq_desc_t *desc; |
99 | unsigned long flags; | |
100 | ||
101 | if (i == 0) { | |
756e7104 SR |
102 | seq_puts(p, " "); |
103 | for_each_online_cpu(j) | |
104 | seq_printf(p, "CPU%d ", j); | |
1da177e4 LT |
105 | seq_putc(p, '\n'); |
106 | } | |
107 | ||
108 | if (i < NR_IRQS) { | |
109 | desc = get_irq_desc(i); | |
110 | spin_lock_irqsave(&desc->lock, flags); | |
111 | action = desc->action; | |
112 | if (!action || !action->handler) | |
113 | goto skip; | |
114 | seq_printf(p, "%3d: ", i); | |
115 | #ifdef CONFIG_SMP | |
756e7104 SR |
116 | for_each_online_cpu(j) |
117 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); | |
1da177e4 LT |
118 | #else |
119 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
120 | #endif /* CONFIG_SMP */ | |
d1bef4ed IM |
121 | if (desc->chip) |
122 | seq_printf(p, " %s ", desc->chip->typename); | |
1da177e4 | 123 | else |
756e7104 | 124 | seq_puts(p, " None "); |
1da177e4 | 125 | seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge "); |
756e7104 SR |
126 | seq_printf(p, " %s", action->name); |
127 | for (action = action->next; action; action = action->next) | |
1da177e4 LT |
128 | seq_printf(p, ", %s", action->name); |
129 | seq_putc(p, '\n'); | |
130 | skip: | |
131 | spin_unlock_irqrestore(&desc->lock, flags); | |
756e7104 SR |
132 | } else if (i == NR_IRQS) { |
133 | #ifdef CONFIG_PPC32 | |
134 | #ifdef CONFIG_TAU_INT | |
135 | if (tau_initialized){ | |
136 | seq_puts(p, "TAU: "); | |
394e3902 AM |
137 | for_each_online_cpu(j) |
138 | seq_printf(p, "%10u ", tau_interrupts(j)); | |
756e7104 SR |
139 | seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n"); |
140 | } | |
141 | #endif | |
142 | #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE) | |
143 | /* should this be per processor send/receive? */ | |
144 | seq_printf(p, "IPI (recv/sent): %10u/%u\n", | |
145 | atomic_read(&ipi_recv), atomic_read(&ipi_sent)); | |
146 | #endif | |
147 | #endif /* CONFIG_PPC32 */ | |
1da177e4 | 148 | seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts); |
756e7104 | 149 | } |
1da177e4 LT |
150 | return 0; |
151 | } | |
152 | ||
153 | #ifdef CONFIG_HOTPLUG_CPU | |
154 | void fixup_irqs(cpumask_t map) | |
155 | { | |
156 | unsigned int irq; | |
157 | static int warned; | |
158 | ||
159 | for_each_irq(irq) { | |
160 | cpumask_t mask; | |
161 | ||
162 | if (irq_desc[irq].status & IRQ_PER_CPU) | |
163 | continue; | |
164 | ||
a53da52f | 165 | cpus_and(mask, irq_desc[irq].affinity, map); |
1da177e4 LT |
166 | if (any_online_cpu(mask) == NR_CPUS) { |
167 | printk("Breaking affinity for irq %i\n", irq); | |
168 | mask = map; | |
169 | } | |
d1bef4ed IM |
170 | if (irq_desc[irq].chip->set_affinity) |
171 | irq_desc[irq].chip->set_affinity(irq, mask); | |
1da177e4 LT |
172 | else if (irq_desc[irq].action && !(warned++)) |
173 | printk("Cannot set affinity for irq %i\n", irq); | |
174 | } | |
175 | ||
176 | local_irq_enable(); | |
177 | mdelay(1); | |
178 | local_irq_disable(); | |
179 | } | |
180 | #endif | |
181 | ||
1da177e4 LT |
182 | void do_IRQ(struct pt_regs *regs) |
183 | { | |
184 | int irq; | |
b709c083 SR |
185 | #ifdef CONFIG_IRQSTACKS |
186 | struct thread_info *curtp, *irqtp; | |
187 | #endif | |
1da177e4 | 188 | |
756e7104 | 189 | irq_enter(); |
1da177e4 LT |
190 | |
191 | #ifdef CONFIG_DEBUG_STACKOVERFLOW | |
192 | /* Debugging check for stack overflow: is there less than 2KB free? */ | |
193 | { | |
194 | long sp; | |
195 | ||
196 | sp = __get_SP() & (THREAD_SIZE-1); | |
197 | ||
198 | if (unlikely(sp < (sizeof(struct thread_info) + 2048))) { | |
199 | printk("do_IRQ: stack overflow: %ld\n", | |
200 | sp - sizeof(struct thread_info)); | |
201 | dump_stack(); | |
202 | } | |
203 | } | |
204 | #endif | |
205 | ||
756e7104 SR |
206 | /* |
207 | * Every platform is required to implement ppc_md.get_irq. | |
208 | * This function will either return an irq number or -1 to | |
209 | * indicate there are no more pending. | |
210 | * The value -2 is for buggy hardware and means that this IRQ | |
211 | * has already been handled. -- Tom | |
212 | */ | |
1da177e4 LT |
213 | irq = ppc_md.get_irq(regs); |
214 | ||
b709c083 SR |
215 | if (irq >= 0) { |
216 | #ifdef CONFIG_IRQSTACKS | |
217 | /* Switch to the irq stack to handle this */ | |
218 | curtp = current_thread_info(); | |
219 | irqtp = hardirq_ctx[smp_processor_id()]; | |
220 | if (curtp != irqtp) { | |
b9e5b4e6 BH |
221 | struct irq_desc *desc = irq_desc + irq; |
222 | void *handler = desc->handle_irq; | |
223 | if (handler == NULL) | |
224 | handler = &__do_IRQ; | |
b709c083 SR |
225 | irqtp->task = curtp->task; |
226 | irqtp->flags = 0; | |
b9e5b4e6 | 227 | call_handle_irq(irq, desc, regs, irqtp, handler); |
b709c083 SR |
228 | irqtp->task = NULL; |
229 | if (irqtp->flags) | |
230 | set_bits(irqtp->flags, &curtp->flags); | |
231 | } else | |
232 | #endif | |
b9e5b4e6 | 233 | generic_handle_irq(irq, regs); |
e199500c SR |
234 | } else if (irq != -2) |
235 | /* That's not SMP safe ... but who cares ? */ | |
236 | ppc_spurious_interrupts++; | |
237 | ||
756e7104 | 238 | irq_exit(); |
756e7104 | 239 | |
e199500c | 240 | #ifdef CONFIG_PPC_ISERIES |
3356bb9f DG |
241 | if (get_lppaca()->int_dword.fields.decr_int) { |
242 | get_lppaca()->int_dword.fields.decr_int = 0; | |
243 | /* Signal a fake decrementer interrupt */ | |
244 | timer_interrupt(regs); | |
e199500c SR |
245 | } |
246 | #endif | |
247 | } | |
1da177e4 LT |
248 | |
249 | void __init init_IRQ(void) | |
250 | { | |
1da177e4 | 251 | ppc_md.init_IRQ(); |
756e7104 | 252 | #ifdef CONFIG_PPC64 |
1da177e4 | 253 | irq_ctx_init(); |
756e7104 | 254 | #endif |
1da177e4 LT |
255 | } |
256 | ||
756e7104 | 257 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
258 | /* |
259 | * Virtual IRQ mapping code, used on systems with XICS interrupt controllers. | |
260 | */ | |
261 | ||
262 | #define UNDEFINED_IRQ 0xffffffff | |
263 | unsigned int virt_irq_to_real_map[NR_IRQS]; | |
264 | ||
265 | /* | |
266 | * Don't use virtual irqs 0, 1, 2 for devices. | |
267 | * The pcnet32 driver considers interrupt numbers < 2 to be invalid, | |
268 | * and 2 is the XICS IPI interrupt. | |
7d01c880 SR |
269 | * We limit virtual irqs to __irq_offet_value less than virt_irq_max so |
270 | * that when we offset them we don't end up with an interrupt | |
271 | * number >= virt_irq_max. | |
1da177e4 LT |
272 | */ |
273 | #define MIN_VIRT_IRQ 3 | |
7d01c880 SR |
274 | |
275 | unsigned int virt_irq_max; | |
276 | static unsigned int max_virt_irq; | |
277 | static unsigned int nr_virt_irqs; | |
1da177e4 LT |
278 | |
279 | void | |
280 | virt_irq_init(void) | |
281 | { | |
282 | int i; | |
7d01c880 SR |
283 | |
284 | if ((virt_irq_max == 0) || (virt_irq_max > (NR_IRQS - 1))) | |
285 | virt_irq_max = NR_IRQS - 1; | |
286 | max_virt_irq = virt_irq_max - __irq_offset_value; | |
287 | nr_virt_irqs = max_virt_irq - MIN_VIRT_IRQ + 1; | |
288 | ||
1da177e4 LT |
289 | for (i = 0; i < NR_IRQS; i++) |
290 | virt_irq_to_real_map[i] = UNDEFINED_IRQ; | |
291 | } | |
292 | ||
293 | /* Create a mapping for a real_irq if it doesn't already exist. | |
294 | * Return the virtual irq as a convenience. | |
295 | */ | |
296 | int virt_irq_create_mapping(unsigned int real_irq) | |
297 | { | |
298 | unsigned int virq, first_virq; | |
299 | static int warned; | |
300 | ||
301 | if (ppc64_interrupt_controller == IC_OPEN_PIC) | |
302 | return real_irq; /* no mapping for openpic (for now) */ | |
303 | ||
f3f66f59 | 304 | if (ppc64_interrupt_controller == IC_CELL_PIC) |
fef1c772 AB |
305 | return real_irq; /* no mapping for iic either */ |
306 | ||
1da177e4 LT |
307 | /* don't map interrupts < MIN_VIRT_IRQ */ |
308 | if (real_irq < MIN_VIRT_IRQ) { | |
309 | virt_irq_to_real_map[real_irq] = real_irq; | |
310 | return real_irq; | |
311 | } | |
312 | ||
7d01c880 | 313 | /* map to a number between MIN_VIRT_IRQ and max_virt_irq */ |
1da177e4 | 314 | virq = real_irq; |
7d01c880 SR |
315 | if (virq > max_virt_irq) |
316 | virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ; | |
1da177e4 LT |
317 | |
318 | /* search for this number or a free slot */ | |
319 | first_virq = virq; | |
320 | while (virt_irq_to_real_map[virq] != UNDEFINED_IRQ) { | |
321 | if (virt_irq_to_real_map[virq] == real_irq) | |
322 | return virq; | |
7d01c880 | 323 | if (++virq > max_virt_irq) |
1da177e4 LT |
324 | virq = MIN_VIRT_IRQ; |
325 | if (virq == first_virq) | |
326 | goto nospace; /* oops, no free slots */ | |
327 | } | |
328 | ||
329 | virt_irq_to_real_map[virq] = real_irq; | |
330 | return virq; | |
331 | ||
332 | nospace: | |
333 | if (!warned) { | |
334 | printk(KERN_CRIT "Interrupt table is full\n"); | |
7d01c880 SR |
335 | printk(KERN_CRIT "Increase virt_irq_max (currently %d) " |
336 | "in your kernel sources and rebuild.\n", virt_irq_max); | |
1da177e4 LT |
337 | warned = 1; |
338 | } | |
339 | return NO_IRQ; | |
340 | } | |
341 | ||
342 | /* | |
343 | * In most cases will get a hit on the very first slot checked in the | |
344 | * virt_irq_to_real_map. Only when there are a large number of | |
345 | * IRQs will this be expensive. | |
346 | */ | |
347 | unsigned int real_irq_to_virt_slowpath(unsigned int real_irq) | |
348 | { | |
349 | unsigned int virq; | |
350 | unsigned int first_virq; | |
351 | ||
352 | virq = real_irq; | |
353 | ||
7d01c880 SR |
354 | if (virq > max_virt_irq) |
355 | virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ; | |
1da177e4 LT |
356 | |
357 | first_virq = virq; | |
358 | ||
359 | do { | |
360 | if (virt_irq_to_real_map[virq] == real_irq) | |
361 | return virq; | |
362 | ||
363 | virq++; | |
364 | ||
7d01c880 | 365 | if (virq >= max_virt_irq) |
1da177e4 LT |
366 | virq = 0; |
367 | ||
368 | } while (first_virq != virq); | |
369 | ||
370 | return NO_IRQ; | |
371 | ||
372 | } | |
c6622f63 | 373 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 374 | |
1da177e4 | 375 | #ifdef CONFIG_IRQSTACKS |
22722051 AM |
376 | struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; |
377 | struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly; | |
1da177e4 LT |
378 | |
379 | void irq_ctx_init(void) | |
380 | { | |
381 | struct thread_info *tp; | |
382 | int i; | |
383 | ||
0e551954 | 384 | for_each_possible_cpu(i) { |
1da177e4 LT |
385 | memset((void *)softirq_ctx[i], 0, THREAD_SIZE); |
386 | tp = softirq_ctx[i]; | |
387 | tp->cpu = i; | |
388 | tp->preempt_count = SOFTIRQ_OFFSET; | |
389 | ||
390 | memset((void *)hardirq_ctx[i], 0, THREAD_SIZE); | |
391 | tp = hardirq_ctx[i]; | |
392 | tp->cpu = i; | |
393 | tp->preempt_count = HARDIRQ_OFFSET; | |
394 | } | |
395 | } | |
396 | ||
c6622f63 PM |
397 | static inline void do_softirq_onstack(void) |
398 | { | |
399 | struct thread_info *curtp, *irqtp; | |
400 | ||
401 | curtp = current_thread_info(); | |
402 | irqtp = softirq_ctx[smp_processor_id()]; | |
403 | irqtp->task = curtp->task; | |
404 | call_do_softirq(irqtp); | |
405 | irqtp->task = NULL; | |
406 | } | |
407 | ||
408 | #else | |
409 | #define do_softirq_onstack() __do_softirq() | |
410 | #endif /* CONFIG_IRQSTACKS */ | |
411 | ||
1da177e4 LT |
412 | void do_softirq(void) |
413 | { | |
414 | unsigned long flags; | |
1da177e4 LT |
415 | |
416 | if (in_interrupt()) | |
417 | return; | |
418 | ||
419 | local_irq_save(flags); | |
420 | ||
421 | if (local_softirq_pending()) { | |
c6622f63 PM |
422 | account_system_vtime(current); |
423 | local_bh_disable(); | |
424 | do_softirq_onstack(); | |
425 | account_system_vtime(current); | |
426 | __local_bh_enable(); | |
1da177e4 LT |
427 | } |
428 | ||
429 | local_irq_restore(flags); | |
430 | } | |
431 | EXPORT_SYMBOL(do_softirq); | |
432 | ||
204face4 JM |
433 | #ifdef CONFIG_PCI_MSI |
434 | int pci_enable_msi(struct pci_dev * pdev) | |
435 | { | |
436 | if (ppc_md.enable_msi) | |
437 | return ppc_md.enable_msi(pdev); | |
438 | else | |
439 | return -1; | |
440 | } | |
441 | ||
442 | void pci_disable_msi(struct pci_dev * pdev) | |
443 | { | |
444 | if (ppc_md.disable_msi) | |
445 | ppc_md.disable_msi(pdev); | |
446 | } | |
447 | ||
448 | void pci_scan_msi_device(struct pci_dev *dev) {} | |
449 | int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;} | |
450 | void pci_disable_msix(struct pci_dev *dev) {} | |
451 | void msi_remove_pci_irq_vectors(struct pci_dev *dev) {} | |
452 | void disable_msi_mode(struct pci_dev *dev, int pos, int type) {} | |
453 | void pci_no_msi(void) {} | |
454 | ||
455 | #endif | |
456 | ||
c6622f63 | 457 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
458 | static int __init setup_noirqdistrib(char *str) |
459 | { | |
460 | distribute_irqs = 0; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | __setup("noirqdistrib", setup_noirqdistrib); | |
756e7104 | 465 | #endif /* CONFIG_PPC64 */ |