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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>
Grant Likelye3873442010-06-18 11:09:59 -060056#include <linux/of.h>
57#include <linux/of_irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59#include <asm/uaccess.h>
60#include <asm/system.h>
61#include <asm/io.h>
62#include <asm/pgtable.h>
63#include <asm/irq.h>
64#include <asm/cache.h>
65#include <asm/prom.h>
66#include <asm/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <asm/machdep.h>
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +100068#include <asm/udbg.h>
Dave Kleikamp3e7f45a2010-08-18 06:44:25 +000069#include <asm/smp.h>
Benjamin Herrenschmidt89c81792010-07-09 15:31:28 +100070
Paul Mackerrasd04c56f2006-10-04 16:47:49 +100071#ifdef CONFIG_PPC64
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <asm/paca.h>
Paul Mackerrasd04c56f2006-10-04 16:47:49 +100073#include <asm/firmware.h>
Takao Shinohara0874dd42007-05-01 07:01:07 +100074#include <asm/lv1call.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#endif
Anton Blanchard1bf4af12009-10-26 18:47:42 +000076#define CREATE_TRACE_POINTS
77#include <asm/trace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Anton Blanchard8c007bf2010-01-31 20:30:23 +000079DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
80EXPORT_PER_CPU_SYMBOL(irq_stat);
81
Stephen Rothwell868accb2005-11-10 18:38:46 +110082int __irq_offset_value;
Stephen Rothwell756e7102005-11-09 18:07:45 +110083
Stephen Rothwell756e7102005-11-09 18:07:45 +110084#ifdef CONFIG_PPC32
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +100085EXPORT_SYMBOL(__irq_offset_value);
Stephen Rothwell756e7102005-11-09 18:07:45 +110086atomic_t ppc_n_lost_interrupts;
87
88#ifdef CONFIG_TAU_INT
89extern int tau_initialized;
90extern int tau_interrupts(int);
91#endif
Benjamin Herrenschmidtb9e5b4e2006-07-03 19:32:51 +100092#endif /* CONFIG_PPC32 */
Stephen Rothwell756e7102005-11-09 18:07:45 +110093
Stephen Rothwell756e7102005-11-09 18:07:45 +110094#ifdef CONFIG_PPC64
Michael Ellermancd015702009-10-13 19:45:03 +000095
96#ifndef CONFIG_SPARSE_IRQ
Linus Torvalds1da177e2005-04-16 15:20:36 -070097EXPORT_SYMBOL(irq_desc);
Michael Ellermancd015702009-10-13 19:45:03 +000098#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100int distribute_irqs = 1;
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000101
Steven Rostedt4e491d12008-05-14 23:49:44 -0400102static inline notrace unsigned long get_hard_enabled(void)
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000103{
104 unsigned long enabled;
105
106 __asm__ __volatile__("lbz %0,%1(13)"
107 : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
108
109 return enabled;
110}
111
Steven Rostedt4e491d12008-05-14 23:49:44 -0400112static inline notrace void set_soft_enabled(unsigned long enable)
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000113{
114 __asm__ __volatile__("stb %0,%1(13)"
115 : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
116}
117
David Howellsdf9ee292010-10-07 14:08:55 +0100118notrace void arch_local_irq_restore(unsigned long en)
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000119{
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000120 /*
121 * get_paca()->soft_enabled = en;
122 * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
123 * That was allowed before, and in such a case we do need to take care
124 * that gcc will set soft_enabled directly via r13, not choose to use
125 * an intermediate register, lest we're preempted to a different cpu.
126 */
127 set_soft_enabled(en);
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000128 if (!en)
129 return;
130
Benjamin Herrenschmidt94491682009-06-02 21:17:45 +0000131#ifdef CONFIG_PPC_STD_MMU_64
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000132 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000133 /*
134 * Do we need to disable preemption here? Not really: in the
135 * unlikely event that we're preempted to a different cpu in
136 * between getting r13, loading its lppaca_ptr, and loading
137 * its any_int, we might call iseries_handle_interrupts without
138 * an interrupt pending on the new cpu, but that's no disaster,
139 * is it? And the business of preempting us off the old cpu
140 * would itself involve a local_irq_restore which handles the
141 * interrupt to that cpu.
142 *
143 * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
144 * to avoid any preemption checking added into get_paca().
145 */
146 if (local_paca->lppaca_ptr->int_dword.any_int)
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000147 iseries_handle_interrupts();
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000148 }
Benjamin Herrenschmidt94491682009-06-02 21:17:45 +0000149#endif /* CONFIG_PPC_STD_MMU_64 */
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000150
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000151 /*
152 * if (get_paca()->hard_enabled) return;
153 * But again we need to take care that gcc gets hard_enabled directly
154 * via r13, not choose to use an intermediate register, lest we're
155 * preempted to a different cpu in between the two instructions.
156 */
157 if (get_hard_enabled())
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000158 return;
Hugh Dickinsef2b3432006-11-10 21:32:40 +0000159
160 /*
161 * Need to hard-enable interrupts here. Since currently disabled,
162 * no need to take further asm precautions against preemption; but
163 * use local_paca instead of get_paca() to avoid preemption checking.
164 */
165 local_paca->hard_enabled = en;
Benjamin Herrenschmidte8775d42010-07-09 15:30:22 +1000166
167#ifndef CONFIG_BOOKE
168 /* On server, re-trigger the decrementer if it went negative since
169 * some processors only trigger on edge transitions of the sign bit.
170 *
171 * BookE has a level sensitive decrementer (latches in TSR) so we
172 * don't need that
173 */
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000174 if ((int)mfspr(SPRN_DEC) < 0)
175 mtspr(SPRN_DEC, 1);
Benjamin Herrenschmidte8775d42010-07-09 15:30:22 +1000176#endif /* CONFIG_BOOKE */
Takao Shinohara0874dd42007-05-01 07:01:07 +1000177
178 /*
179 * Force the delivery of pending soft-disabled interrupts on PS3.
180 * Any HV call will have this side effect.
181 */
182 if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
183 u64 tmp;
184 lv1_get_version_info(&tmp);
185 }
186
Benjamin Herrenschmidte1fa2e12007-05-10 22:22:45 -0700187 __hard_irq_enable();
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000188}
David Howellsdf9ee292010-10-07 14:08:55 +0100189EXPORT_SYMBOL(arch_local_irq_restore);
Stephen Rothwell756e7102005-11-09 18:07:45 +1100190#endif /* CONFIG_PPC64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Thomas Gleixner433c9c62011-03-25 17:04:59 +0100192int arch_show_interrupts(struct seq_file *p, int prec)
Anton Blanchardc86845e2010-01-31 20:33:18 +0000193{
194 int j;
195
196#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
197 if (tau_initialized) {
198 seq_printf(p, "%*s: ", prec, "TAU");
199 for_each_online_cpu(j)
200 seq_printf(p, "%10u ", tau_interrupts(j));
201 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
202 }
203#endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
204
Anton Blanchard89713ed2010-01-31 20:34:06 +0000205 seq_printf(p, "%*s: ", prec, "LOC");
206 for_each_online_cpu(j)
207 seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
208 seq_printf(p, " Local timer interrupts\n");
209
Anton Blanchard170811022010-01-31 20:34:36 +0000210 seq_printf(p, "%*s: ", prec, "SPU");
211 for_each_online_cpu(j)
212 seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs);
213 seq_printf(p, " Spurious interrupts\n");
214
Anton Blanchard89713ed2010-01-31 20:34:06 +0000215 seq_printf(p, "%*s: ", prec, "CNT");
216 for_each_online_cpu(j)
217 seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
218 seq_printf(p, " Performance monitoring interrupts\n");
219
220 seq_printf(p, "%*s: ", prec, "MCE");
221 for_each_online_cpu(j)
222 seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
223 seq_printf(p, " Machine check exceptions\n");
224
Anton Blanchardc86845e2010-01-31 20:33:18 +0000225 return 0;
226}
227
Anton Blanchard89713ed2010-01-31 20:34:06 +0000228/*
229 * /proc/stat helpers
230 */
231u64 arch_irq_stat_cpu(unsigned int cpu)
232{
233 u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
234
235 sum += per_cpu(irq_stat, cpu).pmu_irqs;
236 sum += per_cpu(irq_stat, cpu).mce_exceptions;
Anton Blanchard170811022010-01-31 20:34:36 +0000237 sum += per_cpu(irq_stat, cpu).spurious_irqs;
Anton Blanchard89713ed2010-01-31 20:34:06 +0000238
239 return sum;
240}
241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242#ifdef CONFIG_HOTPLUG_CPU
Benjamin Herrenschmidt1c91cc52011-02-11 13:05:17 +1100243void migrate_irqs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
Michael Ellerman6cff46f2009-10-13 19:44:51 +0000245 struct irq_desc *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 unsigned int irq;
247 static int warned;
Anton Blanchardb6decb72010-04-26 15:32:35 +0000248 cpumask_var_t mask;
Benjamin Herrenschmidt1c91cc52011-02-11 13:05:17 +1100249 const struct cpumask *map = cpu_online_mask;
Anton Blanchardb6decb72010-04-26 15:32:35 +0000250
251 alloc_cpumask_var(&mask, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253 for_each_irq(irq) {
Thomas Gleixner7bfbc1f2011-03-25 16:36:35 +0100254 struct irq_data *data;
Lennert Buytenheke1180282011-03-07 14:00:20 +0000255 struct irq_chip *chip;
256
Michael Ellerman6cff46f2009-10-13 19:44:51 +0000257 desc = irq_to_desc(irq);
Johannes Berg3cd85192010-06-16 00:09:35 +0000258 if (!desc)
259 continue;
260
Thomas Gleixner7bfbc1f2011-03-25 16:36:35 +0100261 data = irq_desc_get_irq_data(desc);
262 if (irqd_is_per_cpu(data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 continue;
264
Thomas Gleixner7bfbc1f2011-03-25 16:36:35 +0100265 chip = irq_data_get_irq_chip(data);
Lennert Buytenheke1180282011-03-07 14:00:20 +0000266
Thomas Gleixner7bfbc1f2011-03-25 16:36:35 +0100267 cpumask_and(mask, data->affinity, map);
Anton Blanchardb6decb72010-04-26 15:32:35 +0000268 if (cpumask_any(mask) >= nr_cpu_ids) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 printk("Breaking affinity for irq %i\n", irq);
Anton Blanchardb6decb72010-04-26 15:32:35 +0000270 cpumask_copy(mask, map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 }
Lennert Buytenheke1180282011-03-07 14:00:20 +0000272 if (chip->irq_set_affinity)
Thomas Gleixner7bfbc1f2011-03-25 16:36:35 +0100273 chip->irq_set_affinity(data, mask, true);
Michael Ellerman6cff46f2009-10-13 19:44:51 +0000274 else if (desc->action && !(warned++))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 printk("Cannot set affinity for irq %i\n", irq);
276 }
277
Anton Blanchardb6decb72010-04-26 15:32:35 +0000278 free_cpumask_var(mask);
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 local_irq_enable();
281 mdelay(1);
282 local_irq_disable();
283}
284#endif
285
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000286static inline void handle_one_irq(unsigned int irq)
287{
288 struct thread_info *curtp, *irqtp;
289 unsigned long saved_sp_limit;
290 struct irq_desc *desc;
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000291
Milton Miller2e455252011-05-24 20:34:18 +0000292 desc = irq_to_desc(irq);
293 if (!desc)
294 return;
295
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000296 /* Switch to the irq stack to handle this */
297 curtp = current_thread_info();
298 irqtp = hardirq_ctx[smp_processor_id()];
299
300 if (curtp == irqtp) {
301 /* We're already on the irq stack, just handle it */
Milton Miller2e455252011-05-24 20:34:18 +0000302 desc->handle_irq(irq, desc);
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000303 return;
304 }
305
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000306 saved_sp_limit = current->thread.ksp_limit;
307
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000308 irqtp->task = curtp->task;
309 irqtp->flags = 0;
310
311 /* Copy the softirq bits in preempt_count so that the
312 * softirq checks work in the hardirq context. */
313 irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) |
314 (curtp->preempt_count & SOFTIRQ_MASK);
315
316 current->thread.ksp_limit = (unsigned long)irqtp +
317 _ALIGN_UP(sizeof(struct thread_info), 16);
318
Michael Ellerman835363e2009-04-22 15:31:43 +0000319 call_handle_irq(irq, desc, irqtp, desc->handle_irq);
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000320 current->thread.ksp_limit = saved_sp_limit;
321 irqtp->task = NULL;
322
323 /* Set any flag that may have been set on the
324 * alternate stack
325 */
326 if (irqtp->flags)
327 set_bits(irqtp->flags, &curtp->flags);
328}
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000329
Michael Ellermand7cb10d2009-04-22 15:31:37 +0000330static inline void check_stack_overflow(void)
331{
332#ifdef CONFIG_DEBUG_STACKOVERFLOW
333 long sp;
334
335 sp = __get_SP() & (THREAD_SIZE-1);
336
337 /* check for stack overflow: is there less than 2KB free? */
338 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
339 printk("do_IRQ: stack overflow: %ld\n",
340 sp - sizeof(struct thread_info));
341 dump_stack();
342 }
343#endif
344}
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346void do_IRQ(struct pt_regs *regs)
347{
David Howells7d12e782006-10-05 14:55:46 +0100348 struct pt_regs *old_regs = set_irq_regs(regs);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000349 unsigned int irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Anton Blanchard1bf4af12009-10-26 18:47:42 +0000351 trace_irq_entry(regs);
352
Scott Wood4b218e92007-08-21 02:36:19 +1000353 irq_enter();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Michael Ellermand7cb10d2009-04-22 15:31:37 +0000355 check_stack_overflow();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Olaf Hering35a84c22006-10-07 22:08:26 +1000357 irq = ppc_md.get_irq();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Michael Ellermanf2694ba2009-04-28 01:57:43 +0000359 if (irq != NO_IRQ && irq != NO_IRQ_IGNORE)
360 handle_one_irq(irq);
361 else if (irq != NO_IRQ_IGNORE)
Anton Blanchard170811022010-01-31 20:34:36 +0000362 __get_cpu_var(irq_stat).spurious_irqs++;
Stephen Rothwell756e7102005-11-09 18:07:45 +1100363
Scott Wood4b218e92007-08-21 02:36:19 +1000364 irq_exit();
David Howells7d12e782006-10-05 14:55:46 +0100365 set_irq_regs(old_regs);
Stephen Rothwelle1995002005-11-16 18:53:29 +1100366
367#ifdef CONFIG_PPC_ISERIES
Stephen Rothwellb06a3182006-11-21 14:16:13 +1100368 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
369 get_lppaca()->int_dword.fields.decr_int) {
David Gibson3356bb9f72006-01-13 10:26:42 +1100370 get_lppaca()->int_dword.fields.decr_int = 0;
371 /* Signal a fake decrementer interrupt */
372 timer_interrupt(regs);
Stephen Rothwelle1995002005-11-16 18:53:29 +1100373 }
374#endif
Anton Blanchard1bf4af12009-10-26 18:47:42 +0000375
376 trace_irq_exit(regs);
Stephen Rothwelle1995002005-11-16 18:53:29 +1100377}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379void __init init_IRQ(void)
380{
Sonny Rao70584572007-07-10 03:31:44 +1000381 if (ppc_md.init_IRQ)
382 ppc_md.init_IRQ();
Kumar Galabcf0b082008-04-30 03:49:55 -0500383
384 exc_lvl_ctx_init();
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 irq_ctx_init();
387}
388
Kumar Galabcf0b082008-04-30 03:49:55 -0500389#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
390struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
391struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
392struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
393
394void exc_lvl_ctx_init(void)
395{
396 struct thread_info *tp;
Michael Ellermanca1769f2011-04-14 22:32:04 +0000397 int i, cpu_nr;
Kumar Galabcf0b082008-04-30 03:49:55 -0500398
399 for_each_possible_cpu(i) {
Michael Ellermanca1769f2011-04-14 22:32:04 +0000400#ifdef CONFIG_PPC64
401 cpu_nr = i;
402#else
403 cpu_nr = get_hard_smp_processor_id(i);
404#endif
405 memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
406 tp = critirq_ctx[cpu_nr];
407 tp->cpu = cpu_nr;
Kumar Galabcf0b082008-04-30 03:49:55 -0500408 tp->preempt_count = 0;
409
410#ifdef CONFIG_BOOKE
Michael Ellermanca1769f2011-04-14 22:32:04 +0000411 memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE);
412 tp = dbgirq_ctx[cpu_nr];
413 tp->cpu = cpu_nr;
Kumar Galabcf0b082008-04-30 03:49:55 -0500414 tp->preempt_count = 0;
415
Michael Ellermanca1769f2011-04-14 22:32:04 +0000416 memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE);
417 tp = mcheckirq_ctx[cpu_nr];
418 tp->cpu = cpu_nr;
Kumar Galabcf0b082008-04-30 03:49:55 -0500419 tp->preempt_count = HARDIRQ_OFFSET;
420#endif
421 }
422}
423#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Andreas Mohr22722052006-06-23 02:05:30 -0700425struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
426struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428void irq_ctx_init(void)
429{
430 struct thread_info *tp;
431 int i;
432
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -0800433 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
435 tp = softirq_ctx[i];
436 tp->cpu = i;
Benjamin Herrenschmidte6768a42008-04-09 17:21:28 +1000437 tp->preempt_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
440 tp = hardirq_ctx[i];
441 tp->cpu = i;
442 tp->preempt_count = HARDIRQ_OFFSET;
443 }
444}
445
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100446static inline void do_softirq_onstack(void)
447{
448 struct thread_info *curtp, *irqtp;
Kumar Gala85218822008-04-28 16:21:22 +1000449 unsigned long saved_sp_limit = current->thread.ksp_limit;
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100450
451 curtp = current_thread_info();
452 irqtp = softirq_ctx[smp_processor_id()];
453 irqtp->task = curtp->task;
Benjamin Herrenschmidt50d2a422011-07-18 17:17:22 +0000454 irqtp->flags = 0;
Kumar Gala85218822008-04-28 16:21:22 +1000455 current->thread.ksp_limit = (unsigned long)irqtp +
456 _ALIGN_UP(sizeof(struct thread_info), 16);
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100457 call_do_softirq(irqtp);
Kumar Gala85218822008-04-28 16:21:22 +1000458 current->thread.ksp_limit = saved_sp_limit;
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100459 irqtp->task = NULL;
Benjamin Herrenschmidt50d2a422011-07-18 17:17:22 +0000460
461 /* Set any flag that may have been set on the
462 * alternate stack
463 */
464 if (irqtp->flags)
465 set_bits(irqtp->flags, &curtp->flags);
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100466}
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468void do_softirq(void)
469{
470 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 if (in_interrupt())
473 return;
474
475 local_irq_save(flags);
476
Paul Mackerras829035fd2006-07-03 00:25:40 -0700477 if (local_softirq_pending())
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100478 do_softirq_onstack();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480 local_irq_restore(flags);
481}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000483
484/*
485 * IRQ controller and virtual interrupts
486 */
487
Grant Likely476eb492011-05-04 15:02:15 +1000488/* The main irq map itself is an array of NR_IRQ entries containing the
489 * associate host and irq number. An entry with a host of NULL is free.
490 * An entry can be allocated if it's free, the allocator always then sets
491 * hwirq first to the host's invalid irq number and then fills ops.
492 */
493struct irq_map_entry {
494 irq_hw_number_t hwirq;
495 struct irq_host *host;
496};
497
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000498static LIST_HEAD(irq_hosts);
Thomas Gleixnerf95e0852010-02-18 02:22:24 +0000499static DEFINE_RAW_SPINLOCK(irq_big_lock);
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000500static DEFINE_MUTEX(revmap_trees_mutex);
Grant Likely476eb492011-05-04 15:02:15 +1000501static struct irq_map_entry irq_map[NR_IRQS];
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000502static unsigned int irq_virq_count = NR_IRQS;
503static struct irq_host *irq_default_host;
504
Grant Likely476eb492011-05-04 15:02:15 +1000505irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
506{
507 return irq_map[d->irq].hwirq;
508}
509EXPORT_SYMBOL_GPL(irqd_to_hwirq);
510
Olof Johansson35923f122007-06-04 14:47:04 +1000511irq_hw_number_t virq_to_hw(unsigned int virq)
512{
513 return irq_map[virq].hwirq;
514}
515EXPORT_SYMBOL_GPL(virq_to_hw);
516
Milton Miller3ee62d32011-05-10 19:30:36 +0000517bool virq_is_host(unsigned int virq, struct irq_host *host)
518{
519 return irq_map[virq].host == host;
520}
521EXPORT_SYMBOL_GPL(virq_is_host);
522
Michael Ellerman68158002007-08-28 18:47:55 +1000523static int default_irq_host_match(struct irq_host *h, struct device_node *np)
524{
525 return h->of_node != NULL && h->of_node == np;
526}
527
Stephen Rothwell5669c3c2007-10-02 13:37:53 +1000528struct irq_host *irq_alloc_host(struct device_node *of_node,
Michael Ellerman52964f82007-08-28 18:47:54 +1000529 unsigned int revmap_type,
530 unsigned int revmap_arg,
531 struct irq_host_ops *ops,
532 irq_hw_number_t inval_irq)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000533{
534 struct irq_host *host;
535 unsigned int size = sizeof(struct irq_host);
536 unsigned int i;
537 unsigned int *rmap;
538 unsigned long flags;
539
540 /* Allocate structure and revmap table if using linear mapping */
541 if (revmap_type == IRQ_HOST_MAP_LINEAR)
542 size += revmap_arg * sizeof(unsigned int);
Milton Miller3af259d2011-05-10 19:29:53 +0000543 host = kzalloc(size, GFP_KERNEL);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000544 if (host == NULL)
545 return NULL;
546
547 /* Fill structure */
548 host->revmap_type = revmap_type;
549 host->inval_irq = inval_irq;
550 host->ops = ops;
Michael Ellerman19fc65b2008-05-26 12:12:32 +1000551 host->of_node = of_node_get(of_node);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000552
Michael Ellerman68158002007-08-28 18:47:55 +1000553 if (host->ops->match == NULL)
554 host->ops->match = default_irq_host_match;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000555
Thomas Gleixnerf95e0852010-02-18 02:22:24 +0000556 raw_spin_lock_irqsave(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000557
558 /* If it's a legacy controller, check for duplicates and
559 * mark it as allocated (we use irq 0 host pointer for that
560 */
561 if (revmap_type == IRQ_HOST_MAP_LEGACY) {
562 if (irq_map[0].host != NULL) {
Thomas Gleixnerf95e0852010-02-18 02:22:24 +0000563 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
Milton Miller3d1b5e22011-05-24 20:34:17 +0000564 of_node_put(host->of_node);
565 kfree(host);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000566 return NULL;
567 }
568 irq_map[0].host = host;
569 }
570
571 list_add(&host->link, &irq_hosts);
Thomas Gleixnerf95e0852010-02-18 02:22:24 +0000572 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000573
574 /* Additional setups per revmap type */
575 switch(revmap_type) {
576 case IRQ_HOST_MAP_LEGACY:
577 /* 0 is always the invalid number for legacy */
578 host->inval_irq = 0;
579 /* setup us as the host for all legacy interrupts */
580 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
Michael Ellerman78662912007-08-28 18:47:56 +1000581 irq_map[i].hwirq = i;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000582 smp_wmb();
583 irq_map[i].host = host;
584 smp_wmb();
585
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000586 /* Legacy flags are left to default at this point,
587 * one can then use irq_create_mapping() to
Jean Delvarec03983a2007-10-19 23:22:55 +0200588 * explicitly change them
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000589 */
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700590 ops->map(host, i, i);
Milton Miller41fb5e62011-05-10 19:30:44 +0000591
592 /* Clear norequest flags */
593 irq_clear_status_flags(i, IRQ_NOREQUEST);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000594 }
595 break;
596 case IRQ_HOST_MAP_LINEAR:
597 rmap = (unsigned int *)(host + 1);
598 for (i = 0; i < revmap_arg; i++)
Michael Ellermanf5921692007-06-01 17:23:26 +1000599 rmap[i] = NO_IRQ;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000600 host->revmap_data.linear.size = revmap_arg;
601 smp_wmb();
602 host->revmap_data.linear.revmap = rmap;
603 break;
Milton Miller3af259d2011-05-10 19:29:53 +0000604 case IRQ_HOST_MAP_TREE:
605 INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL);
606 break;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000607 default:
608 break;
609 }
610
611 pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
612
613 return host;
614}
615
616struct irq_host *irq_find_host(struct device_node *node)
617{
618 struct irq_host *h, *found = NULL;
619 unsigned long flags;
620
621 /* We might want to match the legacy controller last since
622 * it might potentially be set to match all interrupts in
623 * the absence of a device node. This isn't a problem so far
624 * yet though...
625 */
Thomas Gleixnerf95e0852010-02-18 02:22:24 +0000626 raw_spin_lock_irqsave(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000627 list_for_each_entry(h, &irq_hosts, link)
Michael Ellerman68158002007-08-28 18:47:55 +1000628 if (h->ops->match(h, node)) {
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000629 found = h;
630 break;
631 }
Thomas Gleixnerf95e0852010-02-18 02:22:24 +0000632 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000633 return found;
634}
635EXPORT_SYMBOL_GPL(irq_find_host);
636
637void irq_set_default_host(struct irq_host *host)
638{
639 pr_debug("irq: Default host set to @0x%p\n", host);
640
641 irq_default_host = host;
642}
643
644void irq_set_virq_count(unsigned int count)
645{
646 pr_debug("irq: Trying to set virq count to %d\n", count);
647
648 BUG_ON(count < NUM_ISA_INTERRUPTS);
649 if (count < NR_IRQS)
650 irq_virq_count = count;
651}
652
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000653static int irq_setup_virq(struct irq_host *host, unsigned int virq,
654 irq_hw_number_t hwirq)
655{
Thomas Gleixnera9d89462011-01-21 06:12:30 +0000656 int res;
Michael Ellermancd015702009-10-13 19:45:03 +0000657
Thomas Gleixnera9d89462011-01-21 06:12:30 +0000658 res = irq_alloc_desc_at(virq, 0);
659 if (res != virq) {
Michael Ellermancd015702009-10-13 19:45:03 +0000660 pr_debug("irq: -> allocating desc failed\n");
661 goto error;
662 }
663
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000664 /* map it */
665 smp_wmb();
666 irq_map[virq].hwirq = hwirq;
667 smp_mb();
668
669 if (host->ops->map(host, virq, hwirq)) {
670 pr_debug("irq: -> mapping failed, freeing\n");
Thomas Gleixnera9d89462011-01-21 06:12:30 +0000671 goto errdesc;
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000672 }
673
Milton Miller41fb5e62011-05-10 19:30:44 +0000674 irq_clear_status_flags(virq, IRQ_NOREQUEST);
675
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000676 return 0;
Michael Ellermancd015702009-10-13 19:45:03 +0000677
Thomas Gleixnera9d89462011-01-21 06:12:30 +0000678errdesc:
679 irq_free_descs(virq, 1);
Michael Ellermancd015702009-10-13 19:45:03 +0000680error:
681 irq_free_virt(virq, 1);
682 return -1;
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000683}
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000684
Michael Ellermanee51de52007-06-04 23:00:00 +1000685unsigned int irq_create_direct_mapping(struct irq_host *host)
686{
687 unsigned int virq;
688
689 if (host == NULL)
690 host = irq_default_host;
691
692 BUG_ON(host == NULL);
693 WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);
694
695 virq = irq_alloc_virt(host, 1, 0);
696 if (virq == NO_IRQ) {
697 pr_debug("irq: create_direct virq allocation failed\n");
698 return NO_IRQ;
699 }
700
701 pr_debug("irq: create_direct obtained virq %d\n", virq);
702
703 if (irq_setup_virq(host, virq, virq))
704 return NO_IRQ;
705
706 return virq;
707}
708
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000709unsigned int irq_create_mapping(struct irq_host *host,
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700710 irq_hw_number_t hwirq)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000711{
712 unsigned int virq, hint;
713
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700714 pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000715
716 /* Look for default host if nececssary */
717 if (host == NULL)
718 host = irq_default_host;
719 if (host == NULL) {
720 printk(KERN_WARNING "irq_create_mapping called for"
721 " NULL host, hwirq=%lx\n", hwirq);
722 WARN_ON(1);
723 return NO_IRQ;
724 }
725 pr_debug("irq: -> using host @%p\n", host);
726
Milton Miller8142f032011-05-24 20:34:18 +0000727 /* Check if mapping already exists */
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000728 virq = irq_find_mapping(host, hwirq);
Michael Ellermanf5921692007-06-01 17:23:26 +1000729 if (virq != NO_IRQ) {
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000730 pr_debug("irq: -> existing mapping on virq %d\n", virq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000731 return virq;
732 }
733
734 /* Get a virtual interrupt number */
735 if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
736 /* Handle legacy */
737 virq = (unsigned int)hwirq;
738 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
739 return NO_IRQ;
740 return virq;
741 } else {
742 /* Allocate a virtual interrupt number */
743 hint = hwirq % irq_virq_count;
744 virq = irq_alloc_virt(host, 1, hint);
745 if (virq == NO_IRQ) {
746 pr_debug("irq: -> virq allocation failed\n");
747 return NO_IRQ;
748 }
749 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000750
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000751 if (irq_setup_virq(host, virq, hwirq))
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000752 return NO_IRQ;
Michael Ellerman6fde40f2007-06-04 22:59:59 +1000753
Anton Blanchard88962932011-07-07 20:35:38 +0000754 pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n",
Michael Ellermanc7d07fd2009-04-05 16:05:02 +0000755 hwirq, host->of_node ? host->of_node->full_name : "null", virq);
756
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000757 return virq;
758}
759EXPORT_SYMBOL_GPL(irq_create_mapping);
760
Al Virof3d2ab42006-10-09 16:22:09 +0100761unsigned int irq_create_of_mapping(struct device_node *controller,
Roman Fietze40d50cf2009-12-08 02:39:50 +0000762 const u32 *intspec, unsigned int intsize)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000763{
764 struct irq_host *host;
765 irq_hw_number_t hwirq;
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700766 unsigned int type = IRQ_TYPE_NONE;
767 unsigned int virq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000768
769 if (controller == NULL)
770 host = irq_default_host;
771 else
772 host = irq_find_host(controller);
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700773 if (host == NULL) {
774 printk(KERN_WARNING "irq: no irq host found for %s !\n",
775 controller->full_name);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000776 return NO_IRQ;
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700777 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000778
779 /* If host has no translation, then we assume interrupt line */
780 if (host->ops->xlate == NULL)
781 hwirq = intspec[0];
782 else {
783 if (host->ops->xlate(host, controller, intspec, intsize,
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700784 &hwirq, &type))
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000785 return NO_IRQ;
786 }
787
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700788 /* Create mapping */
789 virq = irq_create_mapping(host, hwirq);
790 if (virq == NO_IRQ)
791 return virq;
792
793 /* Set type if specified and different than the current one */
794 if (type != IRQ_TYPE_NONE &&
Thomas Gleixner7bfbc1f2011-03-25 16:36:35 +0100795 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
Thomas Gleixnerec775d02011-03-25 16:45:20 +0100796 irq_set_irq_type(virq, type);
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700797 return virq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000798}
799EXPORT_SYMBOL_GPL(irq_create_of_mapping);
800
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000801void irq_dispose_mapping(unsigned int virq)
802{
Michael Ellerman5414c6b2006-10-24 13:37:34 +1000803 struct irq_host *host;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000804 irq_hw_number_t hwirq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000805
Michael Ellerman5414c6b2006-10-24 13:37:34 +1000806 if (virq == NO_IRQ)
807 return;
808
809 host = irq_map[virq].host;
Milton Miller2d441682011-05-10 19:29:57 +0000810 if (WARN_ON(host == NULL))
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000811 return;
812
813 /* Never unmap legacy interrupts */
814 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
815 return;
816
Milton Miller41fb5e62011-05-10 19:30:44 +0000817 irq_set_status_flags(virq, IRQ_NOREQUEST);
818
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000819 /* remove chip and handler */
Thomas Gleixnerec775d02011-03-25 16:45:20 +0100820 irq_set_chip_and_handler(virq, NULL, NULL);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000821
822 /* Make sure it's completed */
823 synchronize_irq(virq);
824
825 /* Tell the PIC about it */
826 if (host->ops->unmap)
827 host->ops->unmap(host, virq);
828 smp_mb();
829
830 /* Clear reverse map */
831 hwirq = irq_map[virq].hwirq;
832 switch(host->revmap_type) {
833 case IRQ_HOST_MAP_LINEAR:
834 if (hwirq < host->revmap_data.linear.size)
Michael Ellermanf5921692007-06-01 17:23:26 +1000835 host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000836 break;
837 case IRQ_HOST_MAP_TREE:
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000838 mutex_lock(&revmap_trees_mutex);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000839 radix_tree_delete(&host->revmap_data.tree, hwirq);
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000840 mutex_unlock(&revmap_trees_mutex);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000841 break;
842 }
843
844 /* Destroy map */
845 smp_mb();
846 irq_map[virq].hwirq = host->inval_irq;
847
Thomas Gleixnera9d89462011-01-21 06:12:30 +0000848 irq_free_descs(virq, 1);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000849 /* Free it */
850 irq_free_virt(virq, 1);
851}
852EXPORT_SYMBOL_GPL(irq_dispose_mapping);
853
854unsigned int irq_find_mapping(struct irq_host *host,
855 irq_hw_number_t hwirq)
856{
857 unsigned int i;
858 unsigned int hint = hwirq % irq_virq_count;
859
860 /* Look for default host if nececssary */
861 if (host == NULL)
862 host = irq_default_host;
863 if (host == NULL)
864 return NO_IRQ;
865
866 /* legacy -> bail early */
867 if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
868 return hwirq;
869
870 /* Slow path does a linear search of the map */
871 if (hint < NUM_ISA_INTERRUPTS)
872 hint = NUM_ISA_INTERRUPTS;
873 i = hint;
874 do {
875 if (irq_map[i].host == host &&
876 irq_map[i].hwirq == hwirq)
877 return i;
878 i++;
879 if (i >= irq_virq_count)
880 i = NUM_ISA_INTERRUPTS;
881 } while(i != hint);
882 return NO_IRQ;
883}
884EXPORT_SYMBOL_GPL(irq_find_mapping);
885
Stuart Yoder6ec36b52011-05-19 08:54:26 -0500886#ifdef CONFIG_SMP
887int irq_choose_cpu(const struct cpumask *mask)
888{
889 int cpuid;
890
891 if (cpumask_equal(mask, cpu_all_mask)) {
892 static int irq_rover;
893 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
894 unsigned long flags;
895
896 /* Round-robin distribution... */
897do_round_robin:
898 raw_spin_lock_irqsave(&irq_rover_lock, flags);
899
900 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
901 if (irq_rover >= nr_cpu_ids)
902 irq_rover = cpumask_first(cpu_online_mask);
903
904 cpuid = irq_rover;
905
906 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
907 } else {
908 cpuid = cpumask_first_and(mask, cpu_online_mask);
909 if (cpuid >= nr_cpu_ids)
910 goto do_round_robin;
911 }
912
913 return get_hard_smp_processor_id(cpuid);
914}
915#else
916int irq_choose_cpu(const struct cpumask *mask)
917{
918 return hard_smp_processor_id();
919}
920#endif
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000921
Sebastien Dugue967e0122008-09-04 22:37:07 +1000922unsigned int irq_radix_revmap_lookup(struct irq_host *host,
923 irq_hw_number_t hwirq)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000924{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000925 struct irq_map_entry *ptr;
926 unsigned int virq;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000927
Milton Miller2d441682011-05-10 19:29:57 +0000928 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE))
929 return irq_find_mapping(host, hwirq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000930
Sebastien Dugue967e0122008-09-04 22:37:07 +1000931 /*
Milton Miller9b788252011-05-24 20:34:18 +0000932 * The ptr returned references the static global irq_map.
933 * but freeing an irq can delete nodes along the path to
934 * do the lookup via call_rcu.
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000935 */
Milton Miller9b788252011-05-24 20:34:18 +0000936 rcu_read_lock();
Sebastien Dugue967e0122008-09-04 22:37:07 +1000937 ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
Milton Miller9b788252011-05-24 20:34:18 +0000938 rcu_read_unlock();
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000939
Sebastien Dugue967e0122008-09-04 22:37:07 +1000940 /*
941 * If found in radix tree, then fine.
942 * Else fallback to linear lookup - this should not happen in practice
943 * as it means that we failed to insert the node in the radix tree.
944 */
945 if (ptr)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000946 virq = ptr - irq_map;
Sebastien Dugue967e0122008-09-04 22:37:07 +1000947 else
948 virq = irq_find_mapping(host, hwirq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000949
Sebastien Dugue967e0122008-09-04 22:37:07 +1000950 return virq;
951}
952
953void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
954 irq_hw_number_t hwirq)
955{
Milton Miller2d441682011-05-10 19:29:57 +0000956 if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE))
957 return;
Sebastien Dugue967e0122008-09-04 22:37:07 +1000958
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000959 if (virq != NO_IRQ) {
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000960 mutex_lock(&revmap_trees_mutex);
Sebastien Dugue967e0122008-09-04 22:37:07 +1000961 radix_tree_insert(&host->revmap_data.tree, hwirq,
962 &irq_map[virq]);
Sebastien Dugue150c6c82008-09-04 22:37:08 +1000963 mutex_unlock(&revmap_trees_mutex);
Benjamin Herrenschmidt8ec8f2e2006-08-28 11:17:37 +1000964 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000965}
966
967unsigned int irq_linear_revmap(struct irq_host *host,
968 irq_hw_number_t hwirq)
969{
970 unsigned int *revmap;
971
Milton Miller2d441682011-05-10 19:29:57 +0000972 if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR))
973 return irq_find_mapping(host, hwirq);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000974
975 /* Check revmap bounds */
976 if (unlikely(hwirq >= host->revmap_data.linear.size))
977 return irq_find_mapping(host, hwirq);
978
979 /* Check if revmap was allocated */
980 revmap = host->revmap_data.linear.revmap;
981 if (unlikely(revmap == NULL))
982 return irq_find_mapping(host, hwirq);
983
984 /* Fill up revmap with slow path if no mapping found */
985 if (unlikely(revmap[hwirq] == NO_IRQ))
986 revmap[hwirq] = irq_find_mapping(host, hwirq);
987
988 return revmap[hwirq];
989}
990
991unsigned int irq_alloc_virt(struct irq_host *host,
992 unsigned int count,
993 unsigned int hint)
994{
995 unsigned long flags;
996 unsigned int i, j, found = NO_IRQ;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000997
998 if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
999 return NO_IRQ;
1000
Thomas Gleixnerf95e0852010-02-18 02:22:24 +00001001 raw_spin_lock_irqsave(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001002
1003 /* Use hint for 1 interrupt if any */
1004 if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
1005 hint < irq_virq_count && irq_map[hint].host == NULL) {
1006 found = hint;
1007 goto hint_found;
1008 }
1009
1010 /* Look for count consecutive numbers in the allocatable
1011 * (non-legacy) space
1012 */
Michael Ellermane1251462006-08-02 10:48:50 +10001013 for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
1014 if (irq_map[i].host != NULL)
1015 j = 0;
1016 else
1017 j++;
1018
1019 if (j == count) {
1020 found = i - count + 1;
1021 break;
1022 }
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001023 }
1024 if (found == NO_IRQ) {
Thomas Gleixnerf95e0852010-02-18 02:22:24 +00001025 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001026 return NO_IRQ;
1027 }
1028 hint_found:
1029 for (i = found; i < (found + count); i++) {
1030 irq_map[i].hwirq = host->inval_irq;
1031 smp_wmb();
1032 irq_map[i].host = host;
1033 }
Thomas Gleixnerf95e0852010-02-18 02:22:24 +00001034 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001035 return found;
1036}
1037
1038void irq_free_virt(unsigned int virq, unsigned int count)
1039{
1040 unsigned long flags;
1041 unsigned int i;
1042
1043 WARN_ON (virq < NUM_ISA_INTERRUPTS);
1044 WARN_ON (count == 0 || (virq + count) > irq_virq_count);
1045
Milton Miller4dd60292011-05-24 20:34:18 +00001046 if (virq < NUM_ISA_INTERRUPTS) {
1047 if (virq + count < NUM_ISA_INTERRUPTS)
1048 return;
1049 count =- NUM_ISA_INTERRUPTS - virq;
1050 virq = NUM_ISA_INTERRUPTS;
1051 }
1052
1053 if (count > irq_virq_count || virq > irq_virq_count - count) {
1054 if (virq > irq_virq_count)
1055 return;
1056 count = irq_virq_count - virq;
1057 }
1058
Thomas Gleixnerf95e0852010-02-18 02:22:24 +00001059 raw_spin_lock_irqsave(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001060 for (i = virq; i < (virq + count); i++) {
1061 struct irq_host *host;
1062
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001063 host = irq_map[i].host;
1064 irq_map[i].hwirq = host->inval_irq;
1065 smp_wmb();
1066 irq_map[i].host = NULL;
1067 }
Thomas Gleixnerf95e0852010-02-18 02:22:24 +00001068 raw_spin_unlock_irqrestore(&irq_big_lock, flags);
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001069}
1070
Michael Ellermancd015702009-10-13 19:45:03 +00001071int arch_early_irq_init(void)
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001072{
Michael Ellermancd015702009-10-13 19:45:03 +00001073 return 0;
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +10001074}
1075
Michael Ellerman60b332e2007-08-28 18:47:57 +10001076#ifdef CONFIG_VIRQ_DEBUG
1077static int virq_debug_show(struct seq_file *m, void *private)
1078{
1079 unsigned long flags;
Thomas Gleixner97f7d6b2009-03-10 14:45:54 +00001080 struct irq_desc *desc;
Michael Ellerman60b332e2007-08-28 18:47:57 +10001081 const char *p;
Joe Perches4e74fd72010-09-13 09:47:40 +00001082 static const char none[] = "none";
Michael Ellerman73706c32011-04-10 20:26:15 +00001083 void *data;
Michael Ellerman60b332e2007-08-28 18:47:57 +10001084 int i;
1085
Michael Ellerman73706c32011-04-10 20:26:15 +00001086 seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq",
1087 "chip name", "chip data", "host name");
Michael Ellerman60b332e2007-08-28 18:47:57 +10001088
Michael Ellerman76f1d942009-10-13 19:44:56 +00001089 for (i = 1; i < nr_irqs; i++) {
Michael Ellerman6cff46f2009-10-13 19:44:51 +00001090 desc = irq_to_desc(i);
Michael Ellerman76f1d942009-10-13 19:44:56 +00001091 if (!desc)
1092 continue;
1093
Thomas Gleixner239007b2009-11-17 16:46:45 +01001094 raw_spin_lock_irqsave(&desc->lock, flags);
Michael Ellerman60b332e2007-08-28 18:47:57 +10001095
1096 if (desc->action && desc->action->handler) {
Lennert Buytenheke1180282011-03-07 14:00:20 +00001097 struct irq_chip *chip;
1098
Michael Ellerman60b332e2007-08-28 18:47:57 +10001099 seq_printf(m, "%5d ", i);
Grant Likely476eb492011-05-04 15:02:15 +10001100 seq_printf(m, "0x%05lx ", irq_map[i].hwirq);
Michael Ellerman60b332e2007-08-28 18:47:57 +10001101
Thomas Gleixnerec775d02011-03-25 16:45:20 +01001102 chip = irq_desc_get_chip(desc);
Lennert Buytenheke1180282011-03-07 14:00:20 +00001103 if (chip && chip->name)
1104 p = chip->name;
Michael Ellerman60b332e2007-08-28 18:47:57 +10001105 else
1106 p = none;
1107 seq_printf(m, "%-15s ", p);
1108
Michael Ellerman73706c32011-04-10 20:26:15 +00001109 data = irq_desc_get_chip_data(desc);
1110 seq_printf(m, "0x%16p ", data);
1111
Michael Ellerman60b332e2007-08-28 18:47:57 +10001112 if (irq_map[i].host && irq_map[i].host->of_node)
1113 p = irq_map[i].host->of_node->full_name;
1114 else
1115 p = none;
1116 seq_printf(m, "%s\n", p);
1117 }
1118
Thomas Gleixner239007b2009-11-17 16:46:45 +01001119 raw_spin_unlock_irqrestore(&desc->lock, flags);
Michael Ellerman60b332e2007-08-28 18:47:57 +10001120 }
1121
1122 return 0;
1123}
1124
1125static int virq_debug_open(struct inode *inode, struct file *file)
1126{
1127 return single_open(file, virq_debug_show, inode->i_private);
1128}
1129
1130static const struct file_operations virq_debug_fops = {
1131 .open = virq_debug_open,
1132 .read = seq_read,
1133 .llseek = seq_lseek,
1134 .release = single_release,
1135};
1136
1137static int __init irq_debugfs_init(void)
1138{
1139 if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
Emil Medve476ff8a2008-05-23 05:49:22 +10001140 NULL, &virq_debug_fops) == NULL)
Michael Ellerman60b332e2007-08-28 18:47:57 +10001141 return -ENOMEM;
1142
1143 return 0;
1144}
1145__initcall(irq_debugfs_init);
1146#endif /* CONFIG_VIRQ_DEBUG */
1147
Paul Mackerrasc6622f62006-02-24 10:06:59 +11001148#ifdef CONFIG_PPC64
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149static int __init setup_noirqdistrib(char *str)
1150{
1151 distribute_irqs = 0;
1152 return 1;
1153}
1154
1155__setup("noirqdistrib", setup_noirqdistrib);
Stephen Rothwell756e7102005-11-09 18:07:45 +11001156#endif /* CONFIG_PPC64 */