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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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)
Stephen Rothwell756e7102005-11-09 18:07:45 +11006 * Updated and modified by Cort Dougan <cort@fsmlabs.com>
7 * Copyright (C) 1996-2001 Cort Dougan
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Adapted for Power Macintosh by Paul Mackerras
9 * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
Stephen Rothwell756e7102005-11-09 18:07:45 +110010 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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.
Stephen Rothwell756e7102005-11-09 18:07:45 +110021 *
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 */
30
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100031#undef DEBUG
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/module.h>
34#include <linux/threads.h>
35#include <linux/kernel_stat.h>
36#include <linux/signal.h>
37#include <linux/sched.h>
Stephen Rothwell756e7102005-11-09 18:07:45 +110038#include <linux/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/ioport.h>
40#include <linux/interrupt.h>
41#include <linux/timex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/init.h>
43#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/delay.h>
45#include <linux/irq.h>
Stephen Rothwell756e7102005-11-09 18:07:45 +110046#include <linux/seq_file.h>
47#include <linux/cpumask.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/profile.h>
49#include <linux/bitops.h>
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100050#include <linux/list.h>
51#include <linux/radix-tree.h>
52#include <linux/mutex.h>
53#include <linux/bootmem.h>
Jake Moilanen45934c42006-07-27 13:17:25 -050054#include <linux/pci.h>
Michael Ellerman60b332e2007-08-28 18:47:57 +100055#include <linux/debugfs.h>
Stephen Rothwelle14112d2009-06-12 10:14:22 +100056#include <linux/perf_counter.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58#include <asm/uaccess.h>
59#include <asm/system.h>
60#include <asm/io.h>
61#include <asm/pgtable.h>
62#include <asm/irq.h>
63#include <asm/cache.h>
64#include <asm/prom.h>
65#include <asm/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <asm/machdep.h>
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100067#include <asm/udbg.h>
Paul Mackerrasd04c56f2006-10-04 16:47:49 +100068#ifdef CONFIG_PPC64
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include <asm/paca.h>
Paul Mackerrasd04c56f2006-10-04 16:47:49 +100070#include <asm/firmware.h>
Takao Shinohara0874dd42007-05-01 07:01:07 +100071#include <asm/lv1call.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#endif
73
Stephen Rothwell868accb2005-11-10 18:38:46 +110074int __irq_offset_value;
Stephen Rothwell756e7102005-11-09 18:07:45 +110075static int ppc_spurious_interrupts;
76
Stephen Rothwell756e7102005-11-09 18:07:45 +110077#ifdef CONFIG_PPC32
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +100078EXPORT_SYMBOL(__irq_offset_value);
Stephen Rothwell756e7102005-11-09 18:07:45 +110079atomic_t ppc_n_lost_interrupts;
80
81#ifdef CONFIG_TAU_INT
82extern int tau_initialized;
83extern int tau_interrupts(int);
84#endif
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +100085#endif /* CONFIG_PPC32 */
Stephen Rothwell756e7102005-11-09 18:07:45 +110086
Stephen Rothwell756e7102005-11-09 18:07:45 +110087#ifdef CONFIG_PPC64
Linus Torvalds1da177e2005-04-16 15:20:36 -070088EXPORT_SYMBOL(irq_desc);
89
90int distribute_irqs = 1;
Paul Mackerrasd04c56f2006-10-04 16:47:49 +100091
Steven Rostedt4e491d12008-05-14 23:49:44 -040092static inline notrace unsigned long get_hard_enabled(void)
Hugh Dickinsef2b3432006-11-10 21:32:40 +000093{
94 unsigned long enabled;
95
96 __asm__ __volatile__("lbz %0,%1(13)"
97 : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
98
99 return enabled;
100}
101
Steven Rostedt4e491d12008-05-14 23:49:44 -0400102static inline notrace void set_soft_enabled(unsigned long enable)
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000103{
104 __asm__ __volatile__("stb %0,%1(13)"
105 : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
106}
107
Steven Rostedt4e491d12008-05-14 23:49:44 -0400108notrace void raw_local_irq_restore(unsigned long en)
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000109{
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000110 /*
111 * get_paca()->soft_enabled = en;
112 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
113 * That was allowed before, and in such a case we do need to take care
114 * that gcc will set soft_enabled directly via r13, not choose to use
115 * an intermediate register, lest we're preempted to a different cpu.
116 */
117 set_soft_enabled(en);
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000118 if (!en)
119 return;
120
121 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000122 /*
123 * Do we need to disable preemption here? Not really: in the
124 * unlikely event that we're preempted to a different cpu in
125 * between getting r13, loading its lppaca_ptr, and loading
126 * its any_int, we might call iseries_handle_interrupts without
127 * an interrupt pending on the new cpu, but that's no disaster,
128 * is it? And the business of preempting us off the old cpu
129 * would itself involve a local_irq_restore which handles the
130 * interrupt to that cpu.
131 *
132 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
133 * to avoid any preemption checking added into get_paca().
134 */
135 if (local_paca->lppaca_ptr->int_dword.any_int)
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000136 iseries_handle_interrupts();
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000137 }
138
Peter Zijlstra925d5192009-03-30 19:07:02 +0200139 if (test_perf_counter_pending()) {
Paul Mackerrasb6c5a71d2009-03-16 21:00:00 +1100140 clear_perf_counter_pending();
Paul Mackerras93a6d3c2009-01-09 16:52:19 +1100141 perf_counter_do_pending();
Paul Mackerrasb6c5a71d2009-03-16 21:00:00 +1100142 }
Paul Mackerras93a6d3c2009-01-09 16:52:19 +1100143
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000144 /*
145 * if (get_paca()->hard_enabled) return;
146 * But again we need to take care that gcc gets hard_enabled directly
147 * via r13, not choose to use an intermediate register, lest we're
148 * preempted to a different cpu in between the two instructions.
149 */
150 if (get_hard_enabled())
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000151 return;
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000152
153 /*
154 * Need to hard-enable interrupts here. Since currently disabled,
155 * no need to take further asm precautions against preemption; but
156 * use local_paca instead of get_paca() to avoid preemption checking.
157 */
158 local_paca->hard_enabled = en;
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000159 if ((int)mfspr(SPRN_DEC) < 0)
160 mtspr(SPRN_DEC, 1);
Takao Shinohara0874dd42007-05-01 07:01:07 +1000161
162 /*
163 * Force the delivery of pending soft-disabled interrupts on PS3.
164 * Any HV call will have this side effect.
165 */
166 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
167 u64 tmp;
168 lv1_get_version_info(&tmp);
169 }
170
Benjamin Herrenschmidte1fa2e12007-05-10 22:22:45 -0700171 __hard_irq_enable();
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000172}
Benjamin Herrenschmidt945feb12008-04-17 14:35:01 +1000173EXPORT_SYMBOL(raw_local_irq_restore);
Stephen Rothwell756e7102005-11-09 18:07:45 +1100174#endif /* CONFIG_PPC64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176int show_interrupts(struct seq_file *p, void *v)
177{
Stephen Rothwell756e7102005-11-09 18:07:45 +1100178 int i = *(loff_t *)v, j;
179 struct irqaction *action;
Thomas Gleixner97f7d6b2009-03-10 14:45:54 +0000180 struct irq_desc *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 unsigned long flags;
182
183 if (i == 0) {
Stephen Rothwell756e7102005-11-09 18:07:45 +1100184 seq_puts(p, " ");
185 for_each_online_cpu(j)
186 seq_printf(p, "CPU%d ", j);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 seq_putc(p, '\n');
188 }
189
190 if (i < NR_IRQS) {
191 desc = get_irq_desc(i);
192 spin_lock_irqsave(&desc->lock, flags);
193 action = desc->action;
194 if (!action || !action->handler)
195 goto skip;
196 seq_printf(p, "%3d: ", i);
197#ifdef CONFIG_SMP
Stephen Rothwell756e7102005-11-09 18:07:45 +1100198 for_each_online_cpu(j)
Yinghai Ludee41022009-01-11 00:29:15 -0800199 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#else
201 seq_printf(p, "%10u ", kstat_irqs(i));
202#endif /* CONFIG_SMP */
Ingo Molnard1bef4e2006-06-29 02:24:36 -0700203 if (desc->chip)
204 seq_printf(p, " %s ", desc->chip->typename);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 else
Stephen Rothwell756e7102005-11-09 18:07:45 +1100206 seq_puts(p, " None ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge ");
Stephen Rothwell756e7102005-11-09 18:07:45 +1100208 seq_printf(p, " %s", action->name);
209 for (action = action->next; action; action = action->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 seq_printf(p, ", %s", action->name);
211 seq_putc(p, '\n');
212skip:
213 spin_unlock_irqrestore(&desc->lock, flags);
Stephen Rothwell756e7102005-11-09 18:07:45 +1100214 } else if (i == NR_IRQS) {
Kumar Gala9c4cb822008-08-02 02:44:11 +1000215#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
Stephen Rothwell756e7102005-11-09 18:07:45 +1100216 if (tau_initialized){
217 seq_puts(p, "TAU: ");
Andrew Morton394e3902006-03-23 03:01:05 -0800218 for_each_online_cpu(j)
219 seq_printf(p, "%10u ", tau_interrupts(j));
Stephen Rothwell756e7102005-11-09 18:07:45 +1100220 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
221 }
Kumar Gala9c4cb822008-08-02 02:44:11 +1000222#endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
Stephen Rothwell756e7102005-11-09 18:07:45 +1100224 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return 0;
226}
227
228#ifdef CONFIG_HOTPLUG_CPU
229void fixup_irqs(cpumask_t map)
230{
231 unsigned int irq;
232 static int warned;
233
234 for_each_irq(irq) {
235 cpumask_t mask;
236
237 if (irq_desc[irq].status & IRQ_PER_CPU)
238 continue;
239
Mike Travise65e49d2009-01-12 15:27:13 -0800240 cpumask_and(&mask, irq_desc[irq].affinity, &map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 if (any_online_cpu(mask) == NR_CPUS) {
242 printk("Breaking affinity for irq %i\n", irq);
243 mask = map;
244 }
Ingo Molnard1bef4e2006-06-29 02:24:36 -0700245 if (irq_desc[irq].chip->set_affinity)
Rusty Russell0de26522008-12-13 21:20:26 +1030246 irq_desc[irq].chip->set_affinity(irq, &mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 else if (irq_desc[irq].action && !(warned++))
248 printk("Cannot set affinity for irq %i\n", irq);
249 }
250
251 local_irq_enable();
252 mdelay(1);
253 local_irq_disable();
254}
255#endif
256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257void do_IRQ(struct pt_regs *regs)
258{
David Howells7d12e782006-10-05 14:55:46 +0100259 struct pt_regs *old_regs = set_irq_regs(regs);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000260 unsigned int irq;
Stephen Rothwellb709c082005-11-09 13:28:33 +1100261#ifdef CONFIG_IRQSTACKS
262 struct thread_info *curtp, *irqtp;
263#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Scott Wood4b218e92007-08-21 02:36:19 +1000265 irq_enter();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267#ifdef CONFIG_DEBUG_STACKOVERFLOW
268 /* Debugging check for stack overflow: is there less than 2KB free? */
269 {
270 long sp;
271
272 sp = __get_SP() & (THREAD_SIZE-1);
273
274 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
275 printk("do_IRQ: stack overflow: %ld\n",
276 sp - sizeof(struct thread_info));
277 dump_stack();
278 }
279 }
280#endif
281
Stephen Rothwell756e7102005-11-09 18:07:45 +1100282 /*
283 * Every platform is required to implement ppc_md.get_irq.
Johannes Berg92d4dda2006-12-13 13:38:22 +0100284 * This function will either return an irq number or NO_IRQ to
Stephen Rothwell756e7102005-11-09 18:07:45 +1100285 * indicate there are no more pending.
Johannes Berg92d4dda2006-12-13 13:38:22 +0100286 * The value NO_IRQ_IGNORE is for buggy hardware and means that this
287 * IRQ has already been handled. -- Tom
Stephen Rothwell756e7102005-11-09 18:07:45 +1100288 */
Olaf Hering35a84c22006-10-07 22:08:26 +1000289 irq = ppc_md.get_irq();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000291 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
Stephen Rothwellb709c082005-11-09 13:28:33 +1100292#ifdef CONFIG_IRQSTACKS
293 /* Switch to the irq stack to handle this */
294 curtp = current_thread_info();
295 irqtp = hardirq_ctx[smp_processor_id()];
296 if (curtp != irqtp) {
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +1000297 struct irq_desc *desc = irq_desc + irq;
298 void *handler = desc->handle_irq;
Kumar Gala85218822008-04-28 16:21:22 +1000299 unsigned long saved_sp_limit = current->thread.ksp_limit;
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +1000300 if (handler == NULL)
301 handler = &__do_IRQ;
Stephen Rothwellb709c082005-11-09 13:28:33 +1100302 irqtp->task = curtp->task;
303 irqtp->flags = 0;
Benjamin Herrenschmidte6768a42008-04-09 17:21:28 +1000304
305 /* Copy the softirq bits in preempt_count so that the
306 * softirq checks work in the hardirq context.
307 */
308 irqtp->preempt_count =
309 (irqtp->preempt_count & ~SOFTIRQ_MASK) |
310 (curtp->preempt_count & SOFTIRQ_MASK);
311
Kumar Gala85218822008-04-28 16:21:22 +1000312 current->thread.ksp_limit = (unsigned long)irqtp +
313 _ALIGN_UP(sizeof(struct thread_info), 16);
David Howells7d12e782006-10-05 14:55:46 +0100314 call_handle_irq(irq, desc, irqtp, handler);
Kumar Gala85218822008-04-28 16:21:22 +1000315 current->thread.ksp_limit = saved_sp_limit;
Stephen Rothwellb709c082005-11-09 13:28:33 +1100316 irqtp->task = NULL;
Benjamin Herrenschmidte6768a42008-04-09 17:21:28 +1000317
318
319 /* Set any flag that may have been set on the
320 * alternate stack
321 */
Stephen Rothwellb709c082005-11-09 13:28:33 +1100322 if (irqtp->flags)
323 set_bits(irqtp->flags, &curtp->flags);
324 } else
325#endif
David Howells7d12e782006-10-05 14:55:46 +0100326 generic_handle_irq(irq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000327 } else if (irq != NO_IRQ_IGNORE)
Stephen Rothwelle1995002005-11-16 18:53:29 +1100328 /* That's not SMP safe ... but who cares ? */
329 ppc_spurious_interrupts++;
Stephen Rothwell756e7102005-11-09 18:07:45 +1100330
Scott Wood4b218e92007-08-21 02:36:19 +1000331 irq_exit();
David Howells7d12e782006-10-05 14:55:46 +0100332 set_irq_regs(old_regs);
Stephen Rothwelle1995002005-11-16 18:53:29 +1100333
334#ifdef CONFIG_PPC_ISERIES
Stephen Rothwellb06a3182006-11-21 14:16:13 +1100335 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
336 get_lppaca()->int_dword.fields.decr_int) {
David Gibson3356bb92006-01-13 10:26:42 +1100337 get_lppaca()->int_dword.fields.decr_int = 0;
338 /* Signal a fake decrementer interrupt */
339 timer_interrupt(regs);
Stephen Rothwelle1995002005-11-16 18:53:29 +1100340 }
341#endif
342}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
344void __init init_IRQ(void)
345{
Sonny Rao70584572007-07-10 03:31:44 +1000346 if (ppc_md.init_IRQ)
347 ppc_md.init_IRQ();
Kumar Galabcf0b082008-04-30 03:49:55 -0500348
349 exc_lvl_ctx_init();
350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 irq_ctx_init();
352}
353
Kumar Galabcf0b082008-04-30 03:49:55 -0500354#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
355struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
356struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
357struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
358
359void exc_lvl_ctx_init(void)
360{
361 struct thread_info *tp;
362 int i;
363
364 for_each_possible_cpu(i) {
365 memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
366 tp = critirq_ctx[i];
367 tp->cpu = i;
368 tp->preempt_count = 0;
369
370#ifdef CONFIG_BOOKE
371 memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
372 tp = dbgirq_ctx[i];
373 tp->cpu = i;
374 tp->preempt_count = 0;
375
376 memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
377 tp = mcheckirq_ctx[i];
378 tp->cpu = i;
379 tp->preempt_count = HARDIRQ_OFFSET;
380#endif
381 }
382}
383#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385#ifdef CONFIG_IRQSTACKS
Andreas Mohr22722052006-06-23 02:05:30 -0700386struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
387struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
389void irq_ctx_init(void)
390{
391 struct thread_info *tp;
392 int i;
393
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -0800394 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
396 tp = softirq_ctx[i];
397 tp->cpu = i;
Benjamin Herrenschmidte6768a42008-04-09 17:21:28 +1000398 tp->preempt_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
401 tp = hardirq_ctx[i];
402 tp->cpu = i;
403 tp->preempt_count = HARDIRQ_OFFSET;
404 }
405}
406
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100407static inline void do_softirq_onstack(void)
408{
409 struct thread_info *curtp, *irqtp;
Kumar Gala85218822008-04-28 16:21:22 +1000410 unsigned long saved_sp_limit = current->thread.ksp_limit;
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100411
412 curtp = current_thread_info();
413 irqtp = softirq_ctx[smp_processor_id()];
414 irqtp->task = curtp->task;
Kumar Gala85218822008-04-28 16:21:22 +1000415 current->thread.ksp_limit = (unsigned long)irqtp +
416 _ALIGN_UP(sizeof(struct thread_info), 16);
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100417 call_do_softirq(irqtp);
Kumar Gala85218822008-04-28 16:21:22 +1000418 current->thread.ksp_limit = saved_sp_limit;
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100419 irqtp->task = NULL;
420}
421
422#else
423#define do_softirq_onstack() __do_softirq()
424#endif /* CONFIG_IRQSTACKS */
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426void do_softirq(void)
427{
428 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 if (in_interrupt())
431 return;
432
433 local_irq_save(flags);
434
Paul Mackerras829035f2006-07-03 00:25:40 -0700435 if (local_softirq_pending())
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100436 do_softirq_onstack();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438 local_irq_restore(flags);
439}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000441
442/*
443 * IRQ controller and virtual interrupts
444 */
445
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000446static LIST_HEAD(irq_hosts);
Thomas Gleixner057b1842007-04-29 16:10:39 +0000447static DEFINE_SPINLOCK(irq_big_lock);
Sebastien Dugue967e0122008-09-04 22:37:07 +1000448static unsigned int revmap_trees_allocated;
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000449static DEFINE_MUTEX(revmap_trees_mutex);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000450struct irq_map_entry irq_map[NR_IRQS];
451static unsigned int irq_virq_count = NR_IRQS;
452static struct irq_host *irq_default_host;
453
Olof Johansson35923f12007-06-04 14:47:04 +1000454irq_hw_number_t virq_to_hw(unsigned int virq)
455{
456 return irq_map[virq].hwirq;
457}
458EXPORT_SYMBOL_GPL(virq_to_hw);
459
Michael Ellerman68158002007-08-28 18:47:55 +1000460static int default_irq_host_match(struct irq_host *h, struct device_node *np)
461{
462 return h->of_node != NULL && h->of_node == np;
463}
464
Stephen Rothwell5669c3c2007-10-02 13:37:53 +1000465struct irq_host *irq_alloc_host(struct device_node *of_node,
Michael Ellerman52964f82007-08-28 18:47:54 +1000466 unsigned int revmap_type,
467 unsigned int revmap_arg,
468 struct irq_host_ops *ops,
469 irq_hw_number_t inval_irq)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000470{
471 struct irq_host *host;
472 unsigned int size = sizeof(struct irq_host);
473 unsigned int i;
474 unsigned int *rmap;
475 unsigned long flags;
476
477 /* Allocate structure and revmap table if using linear mapping */
478 if (revmap_type == IRQ_HOST_MAP_LINEAR)
479 size += revmap_arg * sizeof(unsigned int);
Stephen Rothwell5669c3c2007-10-02 13:37:53 +1000480 host = zalloc_maybe_bootmem(size, GFP_KERNEL);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000481 if (host == NULL)
482 return NULL;
483
484 /* Fill structure */
485 host->revmap_type = revmap_type;
486 host->inval_irq = inval_irq;
487 host->ops = ops;
Michael Ellerman19fc65b2008-05-26 12:12:32 +1000488 host->of_node = of_node_get(of_node);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000489
Michael Ellerman68158002007-08-28 18:47:55 +1000490 if (host->ops->match == NULL)
491 host->ops->match = default_irq_host_match;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000492
493 spin_lock_irqsave(&irq_big_lock, flags);
494
495 /* If it's a legacy controller, check for duplicates and
496 * mark it as allocated (we use irq 0 host pointer for that
497 */
498 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
499 if (irq_map[0].host != NULL) {
500 spin_unlock_irqrestore(&irq_big_lock, flags);
501 /* If we are early boot, we can't free the structure,
502 * too bad...
503 * this will be fixed once slab is made available early
504 * instead of the current cruft
505 */
506 if (mem_init_done)
507 kfree(host);
508 return NULL;
509 }
510 irq_map[0].host = host;
511 }
512
513 list_add(&host->link, &irq_hosts);
514 spin_unlock_irqrestore(&irq_big_lock, flags);
515
516 /* Additional setups per revmap type */
517 switch(revmap_type) {
518 case IRQ_HOST_MAP_LEGACY:
519 /* 0 is always the invalid number for legacy */
520 host->inval_irq = 0;
521 /* setup us as the host for all legacy interrupts */
522 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
Michael Ellerman78662912007-08-28 18:47:56 +1000523 irq_map[i].hwirq = i;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000524 smp_wmb();
525 irq_map[i].host = host;
526 smp_wmb();
527
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700528 /* Clear norequest flags */
529 get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000530
531 /* Legacy flags are left to default at this point,
532 * one can then use irq_create_mapping() to
Jean Delvarec03983a2007-10-19 23:22:55 +0200533 * explicitly change them
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000534 */
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700535 ops->map(host, i, i);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000536 }
537 break;
538 case IRQ_HOST_MAP_LINEAR:
539 rmap = (unsigned int *)(host + 1);
540 for (i = 0; i < revmap_arg; i++)
Michael Ellermanf5921692007-06-01 17:23:26 +1000541 rmap[i] = NO_IRQ;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000542 host->revmap_data.linear.size = revmap_arg;
543 smp_wmb();
544 host->revmap_data.linear.revmap = rmap;
545 break;
546 default:
547 break;
548 }
549
550 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
551
552 return host;
553}
554
555struct irq_host *irq_find_host(struct device_node *node)
556{
557 struct irq_host *h, *found = NULL;
558 unsigned long flags;
559
560 /* We might want to match the legacy controller last since
561 * it might potentially be set to match all interrupts in
562 * the absence of a device node. This isn't a problem so far
563 * yet though...
564 */
565 spin_lock_irqsave(&irq_big_lock, flags);
566 list_for_each_entry(h, &irq_hosts, link)
Michael Ellerman68158002007-08-28 18:47:55 +1000567 if (h->ops->match(h, node)) {
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000568 found = h;
569 break;
570 }
571 spin_unlock_irqrestore(&irq_big_lock, flags);
572 return found;
573}
574EXPORT_SYMBOL_GPL(irq_find_host);
575
576void irq_set_default_host(struct irq_host *host)
577{
578 pr_debug("irq: Default host set to @0x%p\n", host);
579
580 irq_default_host = host;
581}
582
583void irq_set_virq_count(unsigned int count)
584{
585 pr_debug("irq: Trying to set virq count to %d\n", count);
586
587 BUG_ON(count < NUM_ISA_INTERRUPTS);
588 if (count < NR_IRQS)
589 irq_virq_count = count;
590}
591
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000592static int irq_setup_virq(struct irq_host *host, unsigned int virq,
593 irq_hw_number_t hwirq)
594{
595 /* Clear IRQ_NOREQUEST flag */
596 get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
597
598 /* map it */
599 smp_wmb();
600 irq_map[virq].hwirq = hwirq;
601 smp_mb();
602
603 if (host->ops->map(host, virq, hwirq)) {
604 pr_debug("irq: -> mapping failed, freeing\n");
605 irq_free_virt(virq, 1);
606 return -1;
607 }
608
609 return 0;
610}
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000611
Michael Ellermanee51de52007-06-04 23:00:00 +1000612unsigned int irq_create_direct_mapping(struct irq_host *host)
613{
614 unsigned int virq;
615
616 if (host == NULL)
617 host = irq_default_host;
618
619 BUG_ON(host == NULL);
620 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
621
622 virq = irq_alloc_virt(host, 1, 0);
623 if (virq == NO_IRQ) {
624 pr_debug("irq: create_direct virq allocation failed\n");
625 return NO_IRQ;
626 }
627
628 pr_debug("irq: create_direct obtained virq %d\n", virq);
629
630 if (irq_setup_virq(host, virq, virq))
631 return NO_IRQ;
632
633 return virq;
634}
635
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000636unsigned int irq_create_mapping(struct irq_host *host,
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700637 irq_hw_number_t hwirq)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000638{
639 unsigned int virq, hint;
640
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700641 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000642
643 /* Look for default host if nececssary */
644 if (host == NULL)
645 host = irq_default_host;
646 if (host == NULL) {
647 printk(KERN_WARNING "irq_create_mapping called for"
648 " NULL host, hwirq=%lx\n", hwirq);
649 WARN_ON(1);
650 return NO_IRQ;
651 }
652 pr_debug("irq: -> using host @%p\n", host);
653
654 /* Check if mapping already exist, if it does, call
655 * host->ops->map() to update the flags
656 */
657 virq = irq_find_mapping(host, hwirq);
Michael Ellermanf5921692007-06-01 17:23:26 +1000658 if (virq != NO_IRQ) {
Ishizaki Kouacc900e2007-01-12 09:58:39 +0900659 if (host->ops->remap)
660 host->ops->remap(host, virq, hwirq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000661 pr_debug("irq: -> existing mapping on virq %d\n", virq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000662 return virq;
663 }
664
665 /* Get a virtual interrupt number */
666 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
667 /* Handle legacy */
668 virq = (unsigned int)hwirq;
669 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
670 return NO_IRQ;
671 return virq;
672 } else {
673 /* Allocate a virtual interrupt number */
674 hint = hwirq % irq_virq_count;
675 virq = irq_alloc_virt(host, 1, hint);
676 if (virq == NO_IRQ) {
677 pr_debug("irq: -> virq allocation failed\n");
678 return NO_IRQ;
679 }
680 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000681
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000682 if (irq_setup_virq(host, virq, hwirq))
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000683 return NO_IRQ;
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000684
Michael Ellermanc7d07fd2009-04-05 16:05:02 +0000685 printk(KERN_DEBUG "irq: irq %lu on host %s mapped to virtual irq %u\n",
686 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
687
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000688 return virq;
689}
690EXPORT_SYMBOL_GPL(irq_create_mapping);
691
Al Virof3d2ab42006-10-09 16:22:09 +0100692unsigned int irq_create_of_mapping(struct device_node *controller,
693 u32 *intspec, unsigned int intsize)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000694{
695 struct irq_host *host;
696 irq_hw_number_t hwirq;
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700697 unsigned int type = IRQ_TYPE_NONE;
698 unsigned int virq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000699
700 if (controller == NULL)
701 host = irq_default_host;
702 else
703 host = irq_find_host(controller);
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700704 if (host == NULL) {
705 printk(KERN_WARNING "irq: no irq host found for %s !\n",
706 controller->full_name);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000707 return NO_IRQ;
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700708 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000709
710 /* If host has no translation, then we assume interrupt line */
711 if (host->ops->xlate == NULL)
712 hwirq = intspec[0];
713 else {
714 if (host->ops->xlate(host, controller, intspec, intsize,
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700715 &hwirq, &type))
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000716 return NO_IRQ;
717 }
718
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700719 /* Create mapping */
720 virq = irq_create_mapping(host, hwirq);
721 if (virq == NO_IRQ)
722 return virq;
723
724 /* Set type if specified and different than the current one */
725 if (type != IRQ_TYPE_NONE &&
726 type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
727 set_irq_type(virq, type);
728 return virq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000729}
730EXPORT_SYMBOL_GPL(irq_create_of_mapping);
731
732unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
733{
734 struct of_irq oirq;
735
736 if (of_irq_map_one(dev, index, &oirq))
737 return NO_IRQ;
738
739 return irq_create_of_mapping(oirq.controller, oirq.specifier,
740 oirq.size);
741}
742EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
743
744void irq_dispose_mapping(unsigned int virq)
745{
Michael Ellerman5414c6b2006-10-24 13:37:34 +1000746 struct irq_host *host;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000747 irq_hw_number_t hwirq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000748
Michael Ellerman5414c6b2006-10-24 13:37:34 +1000749 if (virq == NO_IRQ)
750 return;
751
752 host = irq_map[virq].host;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000753 WARN_ON (host == NULL);
754 if (host == NULL)
755 return;
756
757 /* Never unmap legacy interrupts */
758 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
759 return;
760
761 /* remove chip and handler */
762 set_irq_chip_and_handler(virq, NULL, NULL);
763
764 /* Make sure it's completed */
765 synchronize_irq(virq);
766
767 /* Tell the PIC about it */
768 if (host->ops->unmap)
769 host->ops->unmap(host, virq);
770 smp_mb();
771
772 /* Clear reverse map */
773 hwirq = irq_map[virq].hwirq;
774 switch(host->revmap_type) {
775 case IRQ_HOST_MAP_LINEAR:
776 if (hwirq < host->revmap_data.linear.size)
Michael Ellermanf5921692007-06-01 17:23:26 +1000777 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000778 break;
779 case IRQ_HOST_MAP_TREE:
Sebastien Dugue967e0122008-09-04 22:37:07 +1000780 /*
781 * Check if radix tree allocated yet, if not then nothing to
782 * remove.
783 */
784 smp_rmb();
785 if (revmap_trees_allocated < 1)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000786 break;
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000787 mutex_lock(&revmap_trees_mutex);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000788 radix_tree_delete(&host->revmap_data.tree, hwirq);
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000789 mutex_unlock(&revmap_trees_mutex);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000790 break;
791 }
792
793 /* Destroy map */
794 smp_mb();
795 irq_map[virq].hwirq = host->inval_irq;
796
797 /* Set some flags */
798 get_irq_desc(virq)->status |= IRQ_NOREQUEST;
799
800 /* Free it */
801 irq_free_virt(virq, 1);
802}
803EXPORT_SYMBOL_GPL(irq_dispose_mapping);
804
805unsigned int irq_find_mapping(struct irq_host *host,
806 irq_hw_number_t hwirq)
807{
808 unsigned int i;
809 unsigned int hint = hwirq % irq_virq_count;
810
811 /* Look for default host if nececssary */
812 if (host == NULL)
813 host = irq_default_host;
814 if (host == NULL)
815 return NO_IRQ;
816
817 /* legacy -> bail early */
818 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
819 return hwirq;
820
821 /* Slow path does a linear search of the map */
822 if (hint < NUM_ISA_INTERRUPTS)
823 hint = NUM_ISA_INTERRUPTS;
824 i = hint;
825 do {
826 if (irq_map[i].host == host &&
827 irq_map[i].hwirq == hwirq)
828 return i;
829 i++;
830 if (i >= irq_virq_count)
831 i = NUM_ISA_INTERRUPTS;
832 } while(i != hint);
833 return NO_IRQ;
834}
835EXPORT_SYMBOL_GPL(irq_find_mapping);
836
837
Sebastien Dugue967e0122008-09-04 22:37:07 +1000838unsigned int irq_radix_revmap_lookup(struct irq_host *host,
839 irq_hw_number_t hwirq)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000840{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000841 struct irq_map_entry *ptr;
842 unsigned int virq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000843
844 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
845
Sebastien Dugue967e0122008-09-04 22:37:07 +1000846 /*
847 * Check if the radix tree exists and has bee initialized.
848 * If not, we fallback to slow mode
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000849 */
Sebastien Dugue967e0122008-09-04 22:37:07 +1000850 if (revmap_trees_allocated < 2)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000851 return irq_find_mapping(host, hwirq);
852
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000853 /* Now try to resolve */
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000854 /*
855 * No rcu_read_lock(ing) needed, the ptr returned can't go under us
856 * as it's referencing an entry in the static irq_map table.
857 */
Sebastien Dugue967e0122008-09-04 22:37:07 +1000858 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000859
Sebastien Dugue967e0122008-09-04 22:37:07 +1000860 /*
861 * If found in radix tree, then fine.
862 * Else fallback to linear lookup - this should not happen in practice
863 * as it means that we failed to insert the node in the radix tree.
864 */
865 if (ptr)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000866 virq = ptr - irq_map;
Sebastien Dugue967e0122008-09-04 22:37:07 +1000867 else
868 virq = irq_find_mapping(host, hwirq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000869
Sebastien Dugue967e0122008-09-04 22:37:07 +1000870 return virq;
871}
872
873void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
874 irq_hw_number_t hwirq)
875{
Sebastien Dugue967e0122008-09-04 22:37:07 +1000876
877 WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
878
879 /*
880 * Check if the radix tree exists yet.
881 * If not, then the irq will be inserted into the tree when it gets
882 * initialized.
883 */
884 smp_rmb();
885 if (revmap_trees_allocated < 1)
886 return;
887
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000888 if (virq != NO_IRQ) {
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000889 mutex_lock(&revmap_trees_mutex);
Sebastien Dugue967e0122008-09-04 22:37:07 +1000890 radix_tree_insert(&host->revmap_data.tree, hwirq,
891 &irq_map[virq]);
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000892 mutex_unlock(&revmap_trees_mutex);
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000893 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000894}
895
896unsigned int irq_linear_revmap(struct irq_host *host,
897 irq_hw_number_t hwirq)
898{
899 unsigned int *revmap;
900
901 WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
902
903 /* Check revmap bounds */
904 if (unlikely(hwirq >= host->revmap_data.linear.size))
905 return irq_find_mapping(host, hwirq);
906
907 /* Check if revmap was allocated */
908 revmap = host->revmap_data.linear.revmap;
909 if (unlikely(revmap == NULL))
910 return irq_find_mapping(host, hwirq);
911
912 /* Fill up revmap with slow path if no mapping found */
913 if (unlikely(revmap[hwirq] == NO_IRQ))
914 revmap[hwirq] = irq_find_mapping(host, hwirq);
915
916 return revmap[hwirq];
917}
918
919unsigned int irq_alloc_virt(struct irq_host *host,
920 unsigned int count,
921 unsigned int hint)
922{
923 unsigned long flags;
924 unsigned int i, j, found = NO_IRQ;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000925
926 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
927 return NO_IRQ;
928
929 spin_lock_irqsave(&irq_big_lock, flags);
930
931 /* Use hint for 1 interrupt if any */
932 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
933 hint < irq_virq_count && irq_map[hint].host == NULL) {
934 found = hint;
935 goto hint_found;
936 }
937
938 /* Look for count consecutive numbers in the allocatable
939 * (non-legacy) space
940 */
Michael Ellermane1251462006-08-02 10:48:50 +1000941 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
942 if (irq_map[i].host != NULL)
943 j = 0;
944 else
945 j++;
946
947 if (j == count) {
948 found = i - count + 1;
949 break;
950 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000951 }
952 if (found == NO_IRQ) {
953 spin_unlock_irqrestore(&irq_big_lock, flags);
954 return NO_IRQ;
955 }
956 hint_found:
957 for (i = found; i < (found + count); i++) {
958 irq_map[i].hwirq = host->inval_irq;
959 smp_wmb();
960 irq_map[i].host = host;
961 }
962 spin_unlock_irqrestore(&irq_big_lock, flags);
963 return found;
964}
965
966void irq_free_virt(unsigned int virq, unsigned int count)
967{
968 unsigned long flags;
969 unsigned int i;
970
971 WARN_ON (virq < NUM_ISA_INTERRUPTS);
972 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
973
974 spin_lock_irqsave(&irq_big_lock, flags);
975 for (i = virq; i < (virq + count); i++) {
976 struct irq_host *host;
977
978 if (i < NUM_ISA_INTERRUPTS ||
979 (virq + count) > irq_virq_count)
980 continue;
981
982 host = irq_map[i].host;
983 irq_map[i].hwirq = host->inval_irq;
984 smp_wmb();
985 irq_map[i].host = NULL;
986 }
987 spin_unlock_irqrestore(&irq_big_lock, flags);
988}
989
990void irq_early_init(void)
991{
992 unsigned int i;
993
994 for (i = 0; i < NR_IRQS; i++)
995 get_irq_desc(i)->status |= IRQ_NOREQUEST;
996}
997
998/* We need to create the radix trees late */
999static int irq_late_init(void)
1000{
1001 struct irq_host *h;
Sebastien Dugue967e0122008-09-04 22:37:07 +10001002 unsigned int i;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001003
Sebastien Dugue967e0122008-09-04 22:37:07 +10001004 /*
1005 * No mutual exclusion with respect to accessors of the tree is needed
1006 * here as the synchronization is done via the state variable
1007 * revmap_trees_allocated.
1008 */
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001009 list_for_each_entry(h, &irq_hosts, link) {
1010 if (h->revmap_type == IRQ_HOST_MAP_TREE)
Sebastien Dugue967e0122008-09-04 22:37:07 +10001011 INIT_RADIX_TREE(&h->revmap_data.tree, GFP_KERNEL);
1012 }
1013
1014 /*
1015 * Make sure the radix trees inits are visible before setting
1016 * the flag
1017 */
1018 smp_wmb();
1019 revmap_trees_allocated = 1;
1020
1021 /*
1022 * Insert the reverse mapping for those interrupts already present
1023 * in irq_map[].
1024 */
Sebastien Dugue150c6c82008-09-04 22:37:08 +10001025 mutex_lock(&revmap_trees_mutex);
Sebastien Dugue967e0122008-09-04 22:37:07 +10001026 for (i = 0; i < irq_virq_count; i++) {
1027 if (irq_map[i].host &&
1028 (irq_map[i].host->revmap_type == IRQ_HOST_MAP_TREE))
1029 radix_tree_insert(&irq_map[i].host->revmap_data.tree,
1030 irq_map[i].hwirq, &irq_map[i]);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001031 }
Sebastien Dugue150c6c82008-09-04 22:37:08 +10001032 mutex_unlock(&revmap_trees_mutex);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001033
Sebastien Dugue967e0122008-09-04 22:37:07 +10001034 /*
1035 * Make sure the radix trees insertions are visible before setting
1036 * the flag
1037 */
1038 smp_wmb();
1039 revmap_trees_allocated = 2;
1040
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001041 return 0;
1042}
1043arch_initcall(irq_late_init);
1044
Michael Ellerman60b332e2007-08-28 18:47:57 +10001045#ifdef CONFIG_VIRQ_DEBUG
1046static int virq_debug_show(struct seq_file *m, void *private)
1047{
1048 unsigned long flags;
Thomas Gleixner97f7d6b2009-03-10 14:45:54 +00001049 struct irq_desc *desc;
Michael Ellerman60b332e2007-08-28 18:47:57 +10001050 const char *p;
1051 char none[] = "none";
1052 int i;
1053
1054 seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq",
1055 "chip name", "host name");
1056
1057 for (i = 1; i < NR_IRQS; i++) {
1058 desc = get_irq_desc(i);
1059 spin_lock_irqsave(&desc->lock, flags);
1060
1061 if (desc->action && desc->action->handler) {
1062 seq_printf(m, "%5d ", i);
1063 seq_printf(m, "0x%05lx ", virq_to_hw(i));
1064
1065 if (desc->chip && desc->chip->typename)
1066 p = desc->chip->typename;
1067 else
1068 p = none;
1069 seq_printf(m, "%-15s ", p);
1070
1071 if (irq_map[i].host && irq_map[i].host->of_node)
1072 p = irq_map[i].host->of_node->full_name;
1073 else
1074 p = none;
1075 seq_printf(m, "%s\n", p);
1076 }
1077
1078 spin_unlock_irqrestore(&desc->lock, flags);
1079 }
1080
1081 return 0;
1082}
1083
1084static int virq_debug_open(struct inode *inode, struct file *file)
1085{
1086 return single_open(file, virq_debug_show, inode->i_private);
1087}
1088
1089static const struct file_operations virq_debug_fops = {
1090 .open = virq_debug_open,
1091 .read = seq_read,
1092 .llseek = seq_lseek,
1093 .release = single_release,
1094};
1095
1096static int __init irq_debugfs_init(void)
1097{
1098 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
Emil Medve476ff8a2008-05-23 05:49:22 +10001099 NULL, &virq_debug_fops) == NULL)
Michael Ellerman60b332e2007-08-28 18:47:57 +10001100 return -ENOMEM;
1101
1102 return 0;
1103}
1104__initcall(irq_debugfs_init);
1105#endif /* CONFIG_VIRQ_DEBUG */
1106
Paul Mackerrasc6622f62006-02-24 10:06:59 +11001107#ifdef CONFIG_PPC64
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108static int __init setup_noirqdistrib(char *str)
1109{
1110 distribute_irqs = 0;
1111 return 1;
1112}
1113
1114__setup("noirqdistrib", setup_noirqdistrib);
Stephen Rothwell756e7102005-11-09 18:07:45 +11001115#endif /* CONFIG_PPC64 */