Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Derived from arch/i386/kernel/irq.c |
| 3 | * Copyright (C) 1992 Linus Torvalds |
| 4 | * Adapted from arch/i386 by Gary Thomas |
| 5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 6 | * Updated and modified by Cort Dougan <cort@fsmlabs.com> |
| 7 | * Copyright (C) 1996-2001 Cort Dougan |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Adapted for Power Macintosh by Paul Mackerras |
| 9 | * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 10 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This file contains the code used by various IRQ handling routines: |
| 17 | * asking for different IRQ's should be done through these routines |
| 18 | * instead of just grabbing them. Thus setups with different IRQ numbers |
| 19 | * shouldn't result in any weird surprises, and installing new handlers |
| 20 | * should be easier. |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 21 | * |
| 22 | * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the |
| 23 | * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit |
| 24 | * mask register (of which only 16 are defined), hence the weird shifting |
| 25 | * and complement of the cached_irq_mask. I want to be able to stuff |
| 26 | * this right into the SIU SMASK register. |
| 27 | * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx |
| 28 | * to reduce code space and undefined function references. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | */ |
| 30 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 31 | #undef DEBUG |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #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 Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 38 | #include <linux/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/ioport.h> |
| 40 | #include <linux/interrupt.h> |
| 41 | #include <linux/timex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/init.h> |
| 43 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/delay.h> |
| 45 | #include <linux/irq.h> |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 46 | #include <linux/seq_file.h> |
| 47 | #include <linux/cpumask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/profile.h> |
| 49 | #include <linux/bitops.h> |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 50 | #include <linux/list.h> |
| 51 | #include <linux/radix-tree.h> |
| 52 | #include <linux/mutex.h> |
| 53 | #include <linux/bootmem.h> |
Jake Moilanen | 45934c4 | 2006-07-27 13:17:25 -0500 | [diff] [blame] | 54 | #include <linux/pci.h> |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 55 | #include <linux/debugfs.h> |
Grant Likely | e387344 | 2010-06-18 11:09:59 -0600 | [diff] [blame] | 56 | #include <linux/of.h> |
| 57 | #include <linux/of_irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <asm/machdep.h> |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 68 | #include <asm/udbg.h> |
Dave Kleikamp | 3e7f45a | 2010-08-18 06:44:25 +0000 | [diff] [blame] | 69 | #include <asm/smp.h> |
Benjamin Herrenschmidt | 89c8179 | 2010-07-09 15:31:28 +1000 | [diff] [blame] | 70 | |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 71 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #include <asm/paca.h> |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 73 | #include <asm/firmware.h> |
Takao Shinohara | 0874dd4 | 2007-05-01 07:01:07 +1000 | [diff] [blame] | 74 | #include <asm/lv1call.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #endif |
Anton Blanchard | 1bf4af1 | 2009-10-26 18:47:42 +0000 | [diff] [blame] | 76 | #define CREATE_TRACE_POINTS |
| 77 | #include <asm/trace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Anton Blanchard | 8c007bf | 2010-01-31 20:30:23 +0000 | [diff] [blame] | 79 | DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); |
| 80 | EXPORT_PER_CPU_SYMBOL(irq_stat); |
| 81 | |
Stephen Rothwell | 868accb | 2005-11-10 18:38:46 +1100 | [diff] [blame] | 82 | int __irq_offset_value; |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 83 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 84 | #ifdef CONFIG_PPC32 |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 85 | EXPORT_SYMBOL(__irq_offset_value); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 86 | atomic_t ppc_n_lost_interrupts; |
| 87 | |
| 88 | #ifdef CONFIG_TAU_INT |
| 89 | extern int tau_initialized; |
| 90 | extern int tau_interrupts(int); |
| 91 | #endif |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 92 | #endif /* CONFIG_PPC32 */ |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 93 | |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 94 | #ifdef CONFIG_PPC64 |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 95 | |
| 96 | #ifndef CONFIG_SPARSE_IRQ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | EXPORT_SYMBOL(irq_desc); |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 98 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | int distribute_irqs = 1; |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 101 | |
Steven Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 102 | static inline notrace unsigned long get_hard_enabled(void) |
Hugh Dickins | ef2b343 | 2006-11-10 21:32:40 +0000 | [diff] [blame] | 103 | { |
| 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 Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 112 | static inline notrace void set_soft_enabled(unsigned long enable) |
Hugh Dickins | ef2b343 | 2006-11-10 21:32:40 +0000 | [diff] [blame] | 113 | { |
| 114 | __asm__ __volatile__("stb %0,%1(13)" |
| 115 | : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled))); |
| 116 | } |
| 117 | |
David Howells | df9ee29 | 2010-10-07 14:08:55 +0100 | [diff] [blame] | 118 | notrace void arch_local_irq_restore(unsigned long en) |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 119 | { |
Hugh Dickins | ef2b343 | 2006-11-10 21:32:40 +0000 | [diff] [blame] | 120 | /* |
| 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 Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 128 | if (!en) |
| 129 | return; |
| 130 | |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 131 | #ifdef CONFIG_PPC_STD_MMU_64 |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 132 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { |
Hugh Dickins | ef2b343 | 2006-11-10 21:32:40 +0000 | [diff] [blame] | 133 | /* |
| 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 Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 147 | iseries_handle_interrupts(); |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 148 | } |
Benjamin Herrenschmidt | 9449168 | 2009-06-02 21:17:45 +0000 | [diff] [blame] | 149 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 150 | |
Hugh Dickins | ef2b343 | 2006-11-10 21:32:40 +0000 | [diff] [blame] | 151 | /* |
| 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 Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 158 | return; |
Hugh Dickins | ef2b343 | 2006-11-10 21:32:40 +0000 | [diff] [blame] | 159 | |
| 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 Herrenschmidt | e8775d4 | 2010-07-09 15:30:22 +1000 | [diff] [blame] | 166 | |
| 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 Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 174 | if ((int)mfspr(SPRN_DEC) < 0) |
| 175 | mtspr(SPRN_DEC, 1); |
Benjamin Herrenschmidt | e8775d4 | 2010-07-09 15:30:22 +1000 | [diff] [blame] | 176 | #endif /* CONFIG_BOOKE */ |
Takao Shinohara | 0874dd4 | 2007-05-01 07:01:07 +1000 | [diff] [blame] | 177 | |
| 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 Herrenschmidt | e1fa2e1 | 2007-05-10 22:22:45 -0700 | [diff] [blame] | 187 | __hard_irq_enable(); |
Paul Mackerras | d04c56f | 2006-10-04 16:47:49 +1000 | [diff] [blame] | 188 | } |
David Howells | df9ee29 | 2010-10-07 14:08:55 +0100 | [diff] [blame] | 189 | EXPORT_SYMBOL(arch_local_irq_restore); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 190 | #endif /* CONFIG_PPC64 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Thomas Gleixner | 433c9c6 | 2011-03-25 17:04:59 +0100 | [diff] [blame] | 192 | int arch_show_interrupts(struct seq_file *p, int prec) |
Anton Blanchard | c86845e | 2010-01-31 20:33:18 +0000 | [diff] [blame] | 193 | { |
| 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 Blanchard | 89713ed | 2010-01-31 20:34:06 +0000 | [diff] [blame] | 205 | 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 Blanchard | 17081102 | 2010-01-31 20:34:36 +0000 | [diff] [blame] | 210 | 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 Blanchard | 89713ed | 2010-01-31 20:34:06 +0000 | [diff] [blame] | 215 | 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 Blanchard | c86845e | 2010-01-31 20:33:18 +0000 | [diff] [blame] | 225 | return 0; |
| 226 | } |
| 227 | |
Anton Blanchard | 89713ed | 2010-01-31 20:34:06 +0000 | [diff] [blame] | 228 | /* |
| 229 | * /proc/stat helpers |
| 230 | */ |
| 231 | u64 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 Blanchard | 17081102 | 2010-01-31 20:34:36 +0000 | [diff] [blame] | 237 | sum += per_cpu(irq_stat, cpu).spurious_irqs; |
Anton Blanchard | 89713ed | 2010-01-31 20:34:06 +0000 | [diff] [blame] | 238 | |
| 239 | return sum; |
| 240 | } |
| 241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | #ifdef CONFIG_HOTPLUG_CPU |
Benjamin Herrenschmidt | 1c91cc5 | 2011-02-11 13:05:17 +1100 | [diff] [blame] | 243 | void migrate_irqs(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | { |
Michael Ellerman | 6cff46f | 2009-10-13 19:44:51 +0000 | [diff] [blame] | 245 | struct irq_desc *desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | unsigned int irq; |
| 247 | static int warned; |
Anton Blanchard | b6decb7 | 2010-04-26 15:32:35 +0000 | [diff] [blame] | 248 | cpumask_var_t mask; |
Benjamin Herrenschmidt | 1c91cc5 | 2011-02-11 13:05:17 +1100 | [diff] [blame] | 249 | const struct cpumask *map = cpu_online_mask; |
Anton Blanchard | b6decb7 | 2010-04-26 15:32:35 +0000 | [diff] [blame] | 250 | |
| 251 | alloc_cpumask_var(&mask, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 253 | for_each_irq(irq) { |
Thomas Gleixner | 7bfbc1f | 2011-03-25 16:36:35 +0100 | [diff] [blame] | 254 | struct irq_data *data; |
Lennert Buytenhek | e118028 | 2011-03-07 14:00:20 +0000 | [diff] [blame] | 255 | struct irq_chip *chip; |
| 256 | |
Michael Ellerman | 6cff46f | 2009-10-13 19:44:51 +0000 | [diff] [blame] | 257 | desc = irq_to_desc(irq); |
Johannes Berg | 3cd8519 | 2010-06-16 00:09:35 +0000 | [diff] [blame] | 258 | if (!desc) |
| 259 | continue; |
| 260 | |
Thomas Gleixner | 7bfbc1f | 2011-03-25 16:36:35 +0100 | [diff] [blame] | 261 | data = irq_desc_get_irq_data(desc); |
| 262 | if (irqd_is_per_cpu(data)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | continue; |
| 264 | |
Thomas Gleixner | 7bfbc1f | 2011-03-25 16:36:35 +0100 | [diff] [blame] | 265 | chip = irq_data_get_irq_chip(data); |
Lennert Buytenhek | e118028 | 2011-03-07 14:00:20 +0000 | [diff] [blame] | 266 | |
Thomas Gleixner | 7bfbc1f | 2011-03-25 16:36:35 +0100 | [diff] [blame] | 267 | cpumask_and(mask, data->affinity, map); |
Anton Blanchard | b6decb7 | 2010-04-26 15:32:35 +0000 | [diff] [blame] | 268 | if (cpumask_any(mask) >= nr_cpu_ids) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | printk("Breaking affinity for irq %i\n", irq); |
Anton Blanchard | b6decb7 | 2010-04-26 15:32:35 +0000 | [diff] [blame] | 270 | cpumask_copy(mask, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
Lennert Buytenhek | e118028 | 2011-03-07 14:00:20 +0000 | [diff] [blame] | 272 | if (chip->irq_set_affinity) |
Thomas Gleixner | 7bfbc1f | 2011-03-25 16:36:35 +0100 | [diff] [blame] | 273 | chip->irq_set_affinity(data, mask, true); |
Michael Ellerman | 6cff46f | 2009-10-13 19:44:51 +0000 | [diff] [blame] | 274 | else if (desc->action && !(warned++)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | printk("Cannot set affinity for irq %i\n", irq); |
| 276 | } |
| 277 | |
Anton Blanchard | b6decb7 | 2010-04-26 15:32:35 +0000 | [diff] [blame] | 278 | free_cpumask_var(mask); |
| 279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | local_irq_enable(); |
| 281 | mdelay(1); |
| 282 | local_irq_disable(); |
| 283 | } |
| 284 | #endif |
| 285 | |
Michael Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 286 | static 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 Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 291 | |
Milton Miller | 2e45525 | 2011-05-24 20:34:18 +0000 | [diff] [blame] | 292 | desc = irq_to_desc(irq); |
| 293 | if (!desc) |
| 294 | return; |
| 295 | |
Michael Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 296 | /* 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 Miller | 2e45525 | 2011-05-24 20:34:18 +0000 | [diff] [blame] | 302 | desc->handle_irq(irq, desc); |
Michael Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 303 | return; |
| 304 | } |
| 305 | |
Michael Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 306 | saved_sp_limit = current->thread.ksp_limit; |
| 307 | |
Michael Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 308 | 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 Ellerman | 835363e | 2009-04-22 15:31:43 +0000 | [diff] [blame] | 319 | call_handle_irq(irq, desc, irqtp, desc->handle_irq); |
Michael Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 320 | 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 Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 329 | |
Michael Ellerman | d7cb10d | 2009-04-22 15:31:37 +0000 | [diff] [blame] | 330 | static 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | void do_IRQ(struct pt_regs *regs) |
| 347 | { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 348 | struct pt_regs *old_regs = set_irq_regs(regs); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 349 | unsigned int irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Anton Blanchard | 1bf4af1 | 2009-10-26 18:47:42 +0000 | [diff] [blame] | 351 | trace_irq_entry(regs); |
| 352 | |
Scott Wood | 4b218e9 | 2007-08-21 02:36:19 +1000 | [diff] [blame] | 353 | irq_enter(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Michael Ellerman | d7cb10d | 2009-04-22 15:31:37 +0000 | [diff] [blame] | 355 | check_stack_overflow(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
Olaf Hering | 35a84c2 | 2006-10-07 22:08:26 +1000 | [diff] [blame] | 357 | irq = ppc_md.get_irq(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Michael Ellerman | f2694ba | 2009-04-28 01:57:43 +0000 | [diff] [blame] | 359 | if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) |
| 360 | handle_one_irq(irq); |
| 361 | else if (irq != NO_IRQ_IGNORE) |
Anton Blanchard | 17081102 | 2010-01-31 20:34:36 +0000 | [diff] [blame] | 362 | __get_cpu_var(irq_stat).spurious_irqs++; |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 363 | |
Scott Wood | 4b218e9 | 2007-08-21 02:36:19 +1000 | [diff] [blame] | 364 | irq_exit(); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 365 | set_irq_regs(old_regs); |
Stephen Rothwell | e199500 | 2005-11-16 18:53:29 +1100 | [diff] [blame] | 366 | |
| 367 | #ifdef CONFIG_PPC_ISERIES |
Stephen Rothwell | b06a318 | 2006-11-21 14:16:13 +1100 | [diff] [blame] | 368 | if (firmware_has_feature(FW_FEATURE_ISERIES) && |
| 369 | get_lppaca()->int_dword.fields.decr_int) { |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 370 | get_lppaca()->int_dword.fields.decr_int = 0; |
| 371 | /* Signal a fake decrementer interrupt */ |
| 372 | timer_interrupt(regs); |
Stephen Rothwell | e199500 | 2005-11-16 18:53:29 +1100 | [diff] [blame] | 373 | } |
| 374 | #endif |
Anton Blanchard | 1bf4af1 | 2009-10-26 18:47:42 +0000 | [diff] [blame] | 375 | |
| 376 | trace_irq_exit(regs); |
Stephen Rothwell | e199500 | 2005-11-16 18:53:29 +1100 | [diff] [blame] | 377 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | void __init init_IRQ(void) |
| 380 | { |
Sonny Rao | 7058457 | 2007-07-10 03:31:44 +1000 | [diff] [blame] | 381 | if (ppc_md.init_IRQ) |
| 382 | ppc_md.init_IRQ(); |
Kumar Gala | bcf0b08 | 2008-04-30 03:49:55 -0500 | [diff] [blame] | 383 | |
| 384 | exc_lvl_ctx_init(); |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | irq_ctx_init(); |
| 387 | } |
| 388 | |
Kumar Gala | bcf0b08 | 2008-04-30 03:49:55 -0500 | [diff] [blame] | 389 | #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) |
| 390 | struct thread_info *critirq_ctx[NR_CPUS] __read_mostly; |
| 391 | struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly; |
| 392 | struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly; |
| 393 | |
| 394 | void exc_lvl_ctx_init(void) |
| 395 | { |
| 396 | struct thread_info *tp; |
Michael Ellerman | ca1769f | 2011-04-14 22:32:04 +0000 | [diff] [blame] | 397 | int i, cpu_nr; |
Kumar Gala | bcf0b08 | 2008-04-30 03:49:55 -0500 | [diff] [blame] | 398 | |
| 399 | for_each_possible_cpu(i) { |
Michael Ellerman | ca1769f | 2011-04-14 22:32:04 +0000 | [diff] [blame] | 400 | #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 Gala | bcf0b08 | 2008-04-30 03:49:55 -0500 | [diff] [blame] | 408 | tp->preempt_count = 0; |
| 409 | |
| 410 | #ifdef CONFIG_BOOKE |
Michael Ellerman | ca1769f | 2011-04-14 22:32:04 +0000 | [diff] [blame] | 411 | memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE); |
| 412 | tp = dbgirq_ctx[cpu_nr]; |
| 413 | tp->cpu = cpu_nr; |
Kumar Gala | bcf0b08 | 2008-04-30 03:49:55 -0500 | [diff] [blame] | 414 | tp->preempt_count = 0; |
| 415 | |
Michael Ellerman | ca1769f | 2011-04-14 22:32:04 +0000 | [diff] [blame] | 416 | memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE); |
| 417 | tp = mcheckirq_ctx[cpu_nr]; |
| 418 | tp->cpu = cpu_nr; |
Kumar Gala | bcf0b08 | 2008-04-30 03:49:55 -0500 | [diff] [blame] | 419 | tp->preempt_count = HARDIRQ_OFFSET; |
| 420 | #endif |
| 421 | } |
| 422 | } |
| 423 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
Andreas Mohr | 2272205 | 2006-06-23 02:05:30 -0700 | [diff] [blame] | 425 | struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; |
| 426 | struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | void irq_ctx_init(void) |
| 429 | { |
| 430 | struct thread_info *tp; |
| 431 | int i; |
| 432 | |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 433 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | memset((void *)softirq_ctx[i], 0, THREAD_SIZE); |
| 435 | tp = softirq_ctx[i]; |
| 436 | tp->cpu = i; |
Benjamin Herrenschmidt | e6768a4 | 2008-04-09 17:21:28 +1000 | [diff] [blame] | 437 | tp->preempt_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 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 Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 446 | static inline void do_softirq_onstack(void) |
| 447 | { |
| 448 | struct thread_info *curtp, *irqtp; |
Kumar Gala | 8521882 | 2008-04-28 16:21:22 +1000 | [diff] [blame] | 449 | unsigned long saved_sp_limit = current->thread.ksp_limit; |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 450 | |
| 451 | curtp = current_thread_info(); |
| 452 | irqtp = softirq_ctx[smp_processor_id()]; |
| 453 | irqtp->task = curtp->task; |
Benjamin Herrenschmidt | 50d2a42 | 2011-07-18 17:17:22 +0000 | [diff] [blame] | 454 | irqtp->flags = 0; |
Kumar Gala | 8521882 | 2008-04-28 16:21:22 +1000 | [diff] [blame] | 455 | current->thread.ksp_limit = (unsigned long)irqtp + |
| 456 | _ALIGN_UP(sizeof(struct thread_info), 16); |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 457 | call_do_softirq(irqtp); |
Kumar Gala | 8521882 | 2008-04-28 16:21:22 +1000 | [diff] [blame] | 458 | current->thread.ksp_limit = saved_sp_limit; |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 459 | irqtp->task = NULL; |
Benjamin Herrenschmidt | 50d2a42 | 2011-07-18 17:17:22 +0000 | [diff] [blame] | 460 | |
| 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 Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 466 | } |
| 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | void do_softirq(void) |
| 469 | { |
| 470 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | if (in_interrupt()) |
| 473 | return; |
| 474 | |
| 475 | local_irq_save(flags); |
| 476 | |
Paul Mackerras | 829035fd | 2006-07-03 00:25:40 -0700 | [diff] [blame] | 477 | if (local_softirq_pending()) |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 478 | do_softirq_onstack(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | local_irq_restore(flags); |
| 481 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 483 | |
| 484 | /* |
| 485 | * IRQ controller and virtual interrupts |
| 486 | */ |
| 487 | |
Grant Likely | 476eb49 | 2011-05-04 15:02:15 +1000 | [diff] [blame] | 488 | /* 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 | */ |
| 493 | struct irq_map_entry { |
| 494 | irq_hw_number_t hwirq; |
| 495 | struct irq_host *host; |
| 496 | }; |
| 497 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 498 | static LIST_HEAD(irq_hosts); |
Thomas Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 499 | static DEFINE_RAW_SPINLOCK(irq_big_lock); |
Sebastien Dugue | 150c6c8 | 2008-09-04 22:37:08 +1000 | [diff] [blame] | 500 | static DEFINE_MUTEX(revmap_trees_mutex); |
Grant Likely | 476eb49 | 2011-05-04 15:02:15 +1000 | [diff] [blame] | 501 | static struct irq_map_entry irq_map[NR_IRQS]; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 502 | static unsigned int irq_virq_count = NR_IRQS; |
| 503 | static struct irq_host *irq_default_host; |
| 504 | |
Grant Likely | 476eb49 | 2011-05-04 15:02:15 +1000 | [diff] [blame] | 505 | irq_hw_number_t irqd_to_hwirq(struct irq_data *d) |
| 506 | { |
| 507 | return irq_map[d->irq].hwirq; |
| 508 | } |
| 509 | EXPORT_SYMBOL_GPL(irqd_to_hwirq); |
| 510 | |
Olof Johansson | 35923f12 | 2007-06-04 14:47:04 +1000 | [diff] [blame] | 511 | irq_hw_number_t virq_to_hw(unsigned int virq) |
| 512 | { |
| 513 | return irq_map[virq].hwirq; |
| 514 | } |
| 515 | EXPORT_SYMBOL_GPL(virq_to_hw); |
| 516 | |
Milton Miller | 3ee62d3 | 2011-05-10 19:30:36 +0000 | [diff] [blame] | 517 | bool virq_is_host(unsigned int virq, struct irq_host *host) |
| 518 | { |
| 519 | return irq_map[virq].host == host; |
| 520 | } |
| 521 | EXPORT_SYMBOL_GPL(virq_is_host); |
| 522 | |
Michael Ellerman | 6815800 | 2007-08-28 18:47:55 +1000 | [diff] [blame] | 523 | static 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 Rothwell | 5669c3c | 2007-10-02 13:37:53 +1000 | [diff] [blame] | 528 | struct irq_host *irq_alloc_host(struct device_node *of_node, |
Michael Ellerman | 52964f8 | 2007-08-28 18:47:54 +1000 | [diff] [blame] | 529 | unsigned int revmap_type, |
| 530 | unsigned int revmap_arg, |
| 531 | struct irq_host_ops *ops, |
| 532 | irq_hw_number_t inval_irq) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 533 | { |
| 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 Miller | 3af259d | 2011-05-10 19:29:53 +0000 | [diff] [blame] | 543 | host = kzalloc(size, GFP_KERNEL); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 544 | 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 Ellerman | 19fc65b | 2008-05-26 12:12:32 +1000 | [diff] [blame] | 551 | host->of_node = of_node_get(of_node); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 552 | |
Michael Ellerman | 6815800 | 2007-08-28 18:47:55 +1000 | [diff] [blame] | 553 | if (host->ops->match == NULL) |
| 554 | host->ops->match = default_irq_host_match; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 555 | |
Thomas Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 556 | raw_spin_lock_irqsave(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 557 | |
| 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 Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 563 | raw_spin_unlock_irqrestore(&irq_big_lock, flags); |
Milton Miller | 3d1b5e2 | 2011-05-24 20:34:17 +0000 | [diff] [blame] | 564 | of_node_put(host->of_node); |
| 565 | kfree(host); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 566 | return NULL; |
| 567 | } |
| 568 | irq_map[0].host = host; |
| 569 | } |
| 570 | |
| 571 | list_add(&host->link, &irq_hosts); |
Thomas Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 572 | raw_spin_unlock_irqrestore(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 573 | |
| 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 Ellerman | 7866291 | 2007-08-28 18:47:56 +1000 | [diff] [blame] | 581 | irq_map[i].hwirq = i; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 582 | smp_wmb(); |
| 583 | irq_map[i].host = host; |
| 584 | smp_wmb(); |
| 585 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 586 | /* Legacy flags are left to default at this point, |
| 587 | * one can then use irq_create_mapping() to |
Jean Delvare | c03983a | 2007-10-19 23:22:55 +0200 | [diff] [blame] | 588 | * explicitly change them |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 589 | */ |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 590 | ops->map(host, i, i); |
Milton Miller | 41fb5e6 | 2011-05-10 19:30:44 +0000 | [diff] [blame] | 591 | |
| 592 | /* Clear norequest flags */ |
| 593 | irq_clear_status_flags(i, IRQ_NOREQUEST); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 594 | } |
| 595 | break; |
| 596 | case IRQ_HOST_MAP_LINEAR: |
| 597 | rmap = (unsigned int *)(host + 1); |
| 598 | for (i = 0; i < revmap_arg; i++) |
Michael Ellerman | f592169 | 2007-06-01 17:23:26 +1000 | [diff] [blame] | 599 | rmap[i] = NO_IRQ; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 600 | host->revmap_data.linear.size = revmap_arg; |
| 601 | smp_wmb(); |
| 602 | host->revmap_data.linear.revmap = rmap; |
| 603 | break; |
Milton Miller | 3af259d | 2011-05-10 19:29:53 +0000 | [diff] [blame] | 604 | case IRQ_HOST_MAP_TREE: |
| 605 | INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL); |
| 606 | break; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 607 | 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 | |
| 616 | struct 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 Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 626 | raw_spin_lock_irqsave(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 627 | list_for_each_entry(h, &irq_hosts, link) |
Michael Ellerman | 6815800 | 2007-08-28 18:47:55 +1000 | [diff] [blame] | 628 | if (h->ops->match(h, node)) { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 629 | found = h; |
| 630 | break; |
| 631 | } |
Thomas Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 632 | raw_spin_unlock_irqrestore(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 633 | return found; |
| 634 | } |
| 635 | EXPORT_SYMBOL_GPL(irq_find_host); |
| 636 | |
| 637 | void 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 | |
| 644 | void 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 Ellerman | 6fde40f | 2007-06-04 22:59:59 +1000 | [diff] [blame] | 653 | static int irq_setup_virq(struct irq_host *host, unsigned int virq, |
| 654 | irq_hw_number_t hwirq) |
| 655 | { |
Thomas Gleixner | a9d8946 | 2011-01-21 06:12:30 +0000 | [diff] [blame] | 656 | int res; |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 657 | |
Thomas Gleixner | a9d8946 | 2011-01-21 06:12:30 +0000 | [diff] [blame] | 658 | res = irq_alloc_desc_at(virq, 0); |
| 659 | if (res != virq) { |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 660 | pr_debug("irq: -> allocating desc failed\n"); |
| 661 | goto error; |
| 662 | } |
| 663 | |
Michael Ellerman | 6fde40f | 2007-06-04 22:59:59 +1000 | [diff] [blame] | 664 | /* 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 Gleixner | a9d8946 | 2011-01-21 06:12:30 +0000 | [diff] [blame] | 671 | goto errdesc; |
Michael Ellerman | 6fde40f | 2007-06-04 22:59:59 +1000 | [diff] [blame] | 672 | } |
| 673 | |
Milton Miller | 41fb5e6 | 2011-05-10 19:30:44 +0000 | [diff] [blame] | 674 | irq_clear_status_flags(virq, IRQ_NOREQUEST); |
| 675 | |
Michael Ellerman | 6fde40f | 2007-06-04 22:59:59 +1000 | [diff] [blame] | 676 | return 0; |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 677 | |
Thomas Gleixner | a9d8946 | 2011-01-21 06:12:30 +0000 | [diff] [blame] | 678 | errdesc: |
| 679 | irq_free_descs(virq, 1); |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 680 | error: |
| 681 | irq_free_virt(virq, 1); |
| 682 | return -1; |
Michael Ellerman | 6fde40f | 2007-06-04 22:59:59 +1000 | [diff] [blame] | 683 | } |
Benjamin Herrenschmidt | 8ec8f2e | 2006-08-28 11:17:37 +1000 | [diff] [blame] | 684 | |
Michael Ellerman | ee51de5 | 2007-06-04 23:00:00 +1000 | [diff] [blame] | 685 | unsigned 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 Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 709 | unsigned int irq_create_mapping(struct irq_host *host, |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 710 | irq_hw_number_t hwirq) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 711 | { |
| 712 | unsigned int virq, hint; |
| 713 | |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 714 | pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 715 | |
| 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 Miller | 8142f03 | 2011-05-24 20:34:18 +0000 | [diff] [blame] | 727 | /* Check if mapping already exists */ |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 728 | virq = irq_find_mapping(host, hwirq); |
Michael Ellerman | f592169 | 2007-06-01 17:23:26 +1000 | [diff] [blame] | 729 | if (virq != NO_IRQ) { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 730 | pr_debug("irq: -> existing mapping on virq %d\n", virq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 731 | 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 Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 750 | |
Michael Ellerman | 6fde40f | 2007-06-04 22:59:59 +1000 | [diff] [blame] | 751 | if (irq_setup_virq(host, virq, hwirq)) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 752 | return NO_IRQ; |
Michael Ellerman | 6fde40f | 2007-06-04 22:59:59 +1000 | [diff] [blame] | 753 | |
Anton Blanchard | 8896293 | 2011-07-07 20:35:38 +0000 | [diff] [blame] | 754 | pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n", |
Michael Ellerman | c7d07fd | 2009-04-05 16:05:02 +0000 | [diff] [blame] | 755 | hwirq, host->of_node ? host->of_node->full_name : "null", virq); |
| 756 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 757 | return virq; |
| 758 | } |
| 759 | EXPORT_SYMBOL_GPL(irq_create_mapping); |
| 760 | |
Al Viro | f3d2ab4 | 2006-10-09 16:22:09 +0100 | [diff] [blame] | 761 | unsigned int irq_create_of_mapping(struct device_node *controller, |
Roman Fietze | 40d50cf | 2009-12-08 02:39:50 +0000 | [diff] [blame] | 762 | const u32 *intspec, unsigned int intsize) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 763 | { |
| 764 | struct irq_host *host; |
| 765 | irq_hw_number_t hwirq; |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 766 | unsigned int type = IRQ_TYPE_NONE; |
| 767 | unsigned int virq; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 768 | |
| 769 | if (controller == NULL) |
| 770 | host = irq_default_host; |
| 771 | else |
| 772 | host = irq_find_host(controller); |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 773 | if (host == NULL) { |
| 774 | printk(KERN_WARNING "irq: no irq host found for %s !\n", |
| 775 | controller->full_name); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 776 | return NO_IRQ; |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 777 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 778 | |
| 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 Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 784 | &hwirq, &type)) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 785 | return NO_IRQ; |
| 786 | } |
| 787 | |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 788 | /* 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 Gleixner | 7bfbc1f | 2011-03-25 16:36:35 +0100 | [diff] [blame] | 795 | type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 796 | irq_set_irq_type(virq, type); |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 797 | return virq; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 798 | } |
| 799 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); |
| 800 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 801 | void irq_dispose_mapping(unsigned int virq) |
| 802 | { |
Michael Ellerman | 5414c6b | 2006-10-24 13:37:34 +1000 | [diff] [blame] | 803 | struct irq_host *host; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 804 | irq_hw_number_t hwirq; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 805 | |
Michael Ellerman | 5414c6b | 2006-10-24 13:37:34 +1000 | [diff] [blame] | 806 | if (virq == NO_IRQ) |
| 807 | return; |
| 808 | |
| 809 | host = irq_map[virq].host; |
Milton Miller | 2d44168 | 2011-05-10 19:29:57 +0000 | [diff] [blame] | 810 | if (WARN_ON(host == NULL)) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 811 | return; |
| 812 | |
| 813 | /* Never unmap legacy interrupts */ |
| 814 | if (host->revmap_type == IRQ_HOST_MAP_LEGACY) |
| 815 | return; |
| 816 | |
Milton Miller | 41fb5e6 | 2011-05-10 19:30:44 +0000 | [diff] [blame] | 817 | irq_set_status_flags(virq, IRQ_NOREQUEST); |
| 818 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 819 | /* remove chip and handler */ |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 820 | irq_set_chip_and_handler(virq, NULL, NULL); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 821 | |
| 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 Ellerman | f592169 | 2007-06-01 17:23:26 +1000 | [diff] [blame] | 835 | host->revmap_data.linear.revmap[hwirq] = NO_IRQ; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 836 | break; |
| 837 | case IRQ_HOST_MAP_TREE: |
Sebastien Dugue | 150c6c8 | 2008-09-04 22:37:08 +1000 | [diff] [blame] | 838 | mutex_lock(&revmap_trees_mutex); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 839 | radix_tree_delete(&host->revmap_data.tree, hwirq); |
Sebastien Dugue | 150c6c8 | 2008-09-04 22:37:08 +1000 | [diff] [blame] | 840 | mutex_unlock(&revmap_trees_mutex); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 841 | break; |
| 842 | } |
| 843 | |
| 844 | /* Destroy map */ |
| 845 | smp_mb(); |
| 846 | irq_map[virq].hwirq = host->inval_irq; |
| 847 | |
Thomas Gleixner | a9d8946 | 2011-01-21 06:12:30 +0000 | [diff] [blame] | 848 | irq_free_descs(virq, 1); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 849 | /* Free it */ |
| 850 | irq_free_virt(virq, 1); |
| 851 | } |
| 852 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); |
| 853 | |
| 854 | unsigned 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 | } |
| 884 | EXPORT_SYMBOL_GPL(irq_find_mapping); |
| 885 | |
Stuart Yoder | 6ec36b5 | 2011-05-19 08:54:26 -0500 | [diff] [blame] | 886 | #ifdef CONFIG_SMP |
| 887 | int 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... */ |
| 897 | do_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 |
| 916 | int irq_choose_cpu(const struct cpumask *mask) |
| 917 | { |
| 918 | return hard_smp_processor_id(); |
| 919 | } |
| 920 | #endif |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 921 | |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 922 | unsigned int irq_radix_revmap_lookup(struct irq_host *host, |
| 923 | irq_hw_number_t hwirq) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 924 | { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 925 | struct irq_map_entry *ptr; |
| 926 | unsigned int virq; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 927 | |
Milton Miller | 2d44168 | 2011-05-10 19:29:57 +0000 | [diff] [blame] | 928 | if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE)) |
| 929 | return irq_find_mapping(host, hwirq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 930 | |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 931 | /* |
Milton Miller | 9b78825 | 2011-05-24 20:34:18 +0000 | [diff] [blame] | 932 | * 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 Dugue | 150c6c8 | 2008-09-04 22:37:08 +1000 | [diff] [blame] | 935 | */ |
Milton Miller | 9b78825 | 2011-05-24 20:34:18 +0000 | [diff] [blame] | 936 | rcu_read_lock(); |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 937 | ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq); |
Milton Miller | 9b78825 | 2011-05-24 20:34:18 +0000 | [diff] [blame] | 938 | rcu_read_unlock(); |
Benjamin Herrenschmidt | 8ec8f2e | 2006-08-28 11:17:37 +1000 | [diff] [blame] | 939 | |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 940 | /* |
| 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 Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 946 | virq = ptr - irq_map; |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 947 | else |
| 948 | virq = irq_find_mapping(host, hwirq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 949 | |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 950 | return virq; |
| 951 | } |
| 952 | |
| 953 | void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq, |
| 954 | irq_hw_number_t hwirq) |
| 955 | { |
Milton Miller | 2d44168 | 2011-05-10 19:29:57 +0000 | [diff] [blame] | 956 | if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE)) |
| 957 | return; |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 958 | |
Benjamin Herrenschmidt | 8ec8f2e | 2006-08-28 11:17:37 +1000 | [diff] [blame] | 959 | if (virq != NO_IRQ) { |
Sebastien Dugue | 150c6c8 | 2008-09-04 22:37:08 +1000 | [diff] [blame] | 960 | mutex_lock(&revmap_trees_mutex); |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 961 | radix_tree_insert(&host->revmap_data.tree, hwirq, |
| 962 | &irq_map[virq]); |
Sebastien Dugue | 150c6c8 | 2008-09-04 22:37:08 +1000 | [diff] [blame] | 963 | mutex_unlock(&revmap_trees_mutex); |
Benjamin Herrenschmidt | 8ec8f2e | 2006-08-28 11:17:37 +1000 | [diff] [blame] | 964 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 965 | } |
| 966 | |
| 967 | unsigned int irq_linear_revmap(struct irq_host *host, |
| 968 | irq_hw_number_t hwirq) |
| 969 | { |
| 970 | unsigned int *revmap; |
| 971 | |
Milton Miller | 2d44168 | 2011-05-10 19:29:57 +0000 | [diff] [blame] | 972 | if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR)) |
| 973 | return irq_find_mapping(host, hwirq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 974 | |
| 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 | |
| 991 | unsigned 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 Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 997 | |
| 998 | if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS)) |
| 999 | return NO_IRQ; |
| 1000 | |
Thomas Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 1001 | raw_spin_lock_irqsave(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1002 | |
| 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 Ellerman | e125146 | 2006-08-02 10:48:50 +1000 | [diff] [blame] | 1013 | 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 Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1023 | } |
| 1024 | if (found == NO_IRQ) { |
Thomas Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 1025 | raw_spin_unlock_irqrestore(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1026 | 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 Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 1034 | raw_spin_unlock_irqrestore(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1035 | return found; |
| 1036 | } |
| 1037 | |
| 1038 | void 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 Miller | 4dd6029 | 2011-05-24 20:34:18 +0000 | [diff] [blame] | 1046 | 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 Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 1059 | raw_spin_lock_irqsave(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1060 | for (i = virq; i < (virq + count); i++) { |
| 1061 | struct irq_host *host; |
| 1062 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1063 | host = irq_map[i].host; |
| 1064 | irq_map[i].hwirq = host->inval_irq; |
| 1065 | smp_wmb(); |
| 1066 | irq_map[i].host = NULL; |
| 1067 | } |
Thomas Gleixner | f95e085 | 2010-02-18 02:22:24 +0000 | [diff] [blame] | 1068 | raw_spin_unlock_irqrestore(&irq_big_lock, flags); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1069 | } |
| 1070 | |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 1071 | int arch_early_irq_init(void) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1072 | { |
Michael Ellerman | cd01570 | 2009-10-13 19:45:03 +0000 | [diff] [blame] | 1073 | return 0; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1074 | } |
| 1075 | |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1076 | #ifdef CONFIG_VIRQ_DEBUG |
| 1077 | static int virq_debug_show(struct seq_file *m, void *private) |
| 1078 | { |
| 1079 | unsigned long flags; |
Thomas Gleixner | 97f7d6b | 2009-03-10 14:45:54 +0000 | [diff] [blame] | 1080 | struct irq_desc *desc; |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1081 | const char *p; |
Joe Perches | 4e74fd7 | 2010-09-13 09:47:40 +0000 | [diff] [blame] | 1082 | static const char none[] = "none"; |
Michael Ellerman | 73706c3 | 2011-04-10 20:26:15 +0000 | [diff] [blame] | 1083 | void *data; |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1084 | int i; |
| 1085 | |
Michael Ellerman | 73706c3 | 2011-04-10 20:26:15 +0000 | [diff] [blame] | 1086 | seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq", |
| 1087 | "chip name", "chip data", "host name"); |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1088 | |
Michael Ellerman | 76f1d94 | 2009-10-13 19:44:56 +0000 | [diff] [blame] | 1089 | for (i = 1; i < nr_irqs; i++) { |
Michael Ellerman | 6cff46f | 2009-10-13 19:44:51 +0000 | [diff] [blame] | 1090 | desc = irq_to_desc(i); |
Michael Ellerman | 76f1d94 | 2009-10-13 19:44:56 +0000 | [diff] [blame] | 1091 | if (!desc) |
| 1092 | continue; |
| 1093 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1094 | raw_spin_lock_irqsave(&desc->lock, flags); |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1095 | |
| 1096 | if (desc->action && desc->action->handler) { |
Lennert Buytenhek | e118028 | 2011-03-07 14:00:20 +0000 | [diff] [blame] | 1097 | struct irq_chip *chip; |
| 1098 | |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1099 | seq_printf(m, "%5d ", i); |
Grant Likely | 476eb49 | 2011-05-04 15:02:15 +1000 | [diff] [blame] | 1100 | seq_printf(m, "0x%05lx ", irq_map[i].hwirq); |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1101 | |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 1102 | chip = irq_desc_get_chip(desc); |
Lennert Buytenhek | e118028 | 2011-03-07 14:00:20 +0000 | [diff] [blame] | 1103 | if (chip && chip->name) |
| 1104 | p = chip->name; |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1105 | else |
| 1106 | p = none; |
| 1107 | seq_printf(m, "%-15s ", p); |
| 1108 | |
Michael Ellerman | 73706c3 | 2011-04-10 20:26:15 +0000 | [diff] [blame] | 1109 | data = irq_desc_get_chip_data(desc); |
| 1110 | seq_printf(m, "0x%16p ", data); |
| 1111 | |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1112 | 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 Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 1119 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1120 | } |
| 1121 | |
| 1122 | return 0; |
| 1123 | } |
| 1124 | |
| 1125 | static int virq_debug_open(struct inode *inode, struct file *file) |
| 1126 | { |
| 1127 | return single_open(file, virq_debug_show, inode->i_private); |
| 1128 | } |
| 1129 | |
| 1130 | static 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 | |
| 1137 | static int __init irq_debugfs_init(void) |
| 1138 | { |
| 1139 | if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root, |
Emil Medve | 476ff8a | 2008-05-23 05:49:22 +1000 | [diff] [blame] | 1140 | NULL, &virq_debug_fops) == NULL) |
Michael Ellerman | 60b332e | 2007-08-28 18:47:57 +1000 | [diff] [blame] | 1141 | return -ENOMEM; |
| 1142 | |
| 1143 | return 0; |
| 1144 | } |
| 1145 | __initcall(irq_debugfs_init); |
| 1146 | #endif /* CONFIG_VIRQ_DEBUG */ |
| 1147 | |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 1148 | #ifdef CONFIG_PPC64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | static int __init setup_noirqdistrib(char *str) |
| 1150 | { |
| 1151 | distribute_irqs = 0; |
| 1152 | return 1; |
| 1153 | } |
| 1154 | |
| 1155 | __setup("noirqdistrib", setup_noirqdistrib); |
Stephen Rothwell | 756e710 | 2005-11-09 18:07:45 +1100 | [diff] [blame] | 1156 | #endif /* CONFIG_PPC64 */ |