blob: 0ca254085a6626374ed488401618ca3af19872c7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Code to handle x86 style IRQs plus some generic interrupt stuff.
3 *
4 * Copyright (C) 1992 Linus Torvalds
5 * Copyright (C) 1994, 1995, 1996, 1997, 1998 Ralf Baechle
6 * Copyright (C) 1999 SuSE GmbH (Philipp Rumpf, prumpf@tux.org)
7 * Copyright (C) 1999-2000 Grant Grundler
8 * Copyright (c) 2005 Matthew Wilcox
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
13 * any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/errno.h>
26#include <linux/init.h>
27#include <linux/interrupt.h>
28#include <linux/kernel_stat.h>
29#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/types.h>
James Bottomleyc2ab64d2005-11-17 16:28:37 -050031#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Kyle McMartin1d4c4522005-11-17 16:27:44 -050033#include <asm/smp.h>
Helge Dellerd96b51e2013-05-24 21:27:35 +000034#include <asm/ldcw.h>
Kyle McMartin1d4c4522005-11-17 16:27:44 -050035
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#undef PARISC_IRQ_CR16_COUNTS
37
Matthew Wilcoxbe577a52006-10-06 20:47:23 -060038extern irqreturn_t timer_interrupt(int, void *);
39extern irqreturn_t ipi_interrupt(int, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#define EIEM_MASK(irq) (1UL<<(CPU_IRQ_MAX - irq))
42
43/* Bits in EIEM correlate with cpu_irq_action[].
44** Numbered *Big Endian*! (ie bit 0 is MSB)
45*/
46static volatile unsigned long cpu_eiem = 0;
47
James Bottomley70856892006-09-09 12:36:25 -070048/*
Grant Grundler462b5292007-06-10 16:31:41 -060049** local ACK bitmap ... habitually set to 1, but reset to zero
James Bottomley70856892006-09-09 12:36:25 -070050** between ->ack() and ->end() of the interrupt to prevent
51** re-interruption of a processing interrupt.
52*/
James Bottomley70856892006-09-09 12:36:25 -070053static DEFINE_PER_CPU(unsigned long, local_ack_eiem) = ~0UL;
54
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +000055static void cpu_mask_irq(struct irq_data *d)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +000057 unsigned long eirr_bit = EIEM_MASK(d->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 cpu_eiem &= ~eirr_bit;
James Bottomleyd911aed2005-11-17 16:27:02 -050060 /* Do nothing on the other CPUs. If they get this interrupt,
61 * The & cpu_eiem in the do_cpu_irq_mask() ensures they won't
62 * handle it, and the set_eiem() at the bottom will ensure it
63 * then gets disabled */
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +000066static void __cpu_unmask_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 unsigned long eirr_bit = EIEM_MASK(irq);
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 cpu_eiem |= eirr_bit;
James Bottomleyd911aed2005-11-17 16:27:02 -050071
James Bottomleyd911aed2005-11-17 16:27:02 -050072 /* This is just a simple NOP IPI. But what it does is cause
73 * all the other CPUs to do a set_eiem(cpu_eiem) at the end
74 * of the interrupt handler */
75 smp_send_all_nop();
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +000078static void cpu_unmask_irq(struct irq_data *d)
James Bottomley70856892006-09-09 12:36:25 -070079{
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +000080 __cpu_unmask_irq(d->irq);
81}
82
83void cpu_ack_irq(struct irq_data *d)
84{
85 unsigned long mask = EIEM_MASK(d->irq);
James Bottomley70856892006-09-09 12:36:25 -070086 int cpu = smp_processor_id();
87
88 /* Clear in EIEM so we can no longer process */
Grant Grundler462b5292007-06-10 16:31:41 -060089 per_cpu(local_ack_eiem, cpu) &= ~mask;
James Bottomley70856892006-09-09 12:36:25 -070090
91 /* disable the interrupt */
Grant Grundler462b5292007-06-10 16:31:41 -060092 set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
93
James Bottomley70856892006-09-09 12:36:25 -070094 /* and now ack it */
95 mtctl(mask, 23);
96}
97
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +000098void cpu_eoi_irq(struct irq_data *d)
James Bottomley70856892006-09-09 12:36:25 -070099{
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000100 unsigned long mask = EIEM_MASK(d->irq);
James Bottomley70856892006-09-09 12:36:25 -0700101 int cpu = smp_processor_id();
102
103 /* set it in the eiems---it's no longer in process */
Grant Grundler462b5292007-06-10 16:31:41 -0600104 per_cpu(local_ack_eiem, cpu) |= mask;
James Bottomley70856892006-09-09 12:36:25 -0700105
106 /* enable the interrupt */
Grant Grundler462b5292007-06-10 16:31:41 -0600107 set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
James Bottomley70856892006-09-09 12:36:25 -0700108}
109
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500110#ifdef CONFIG_SMP
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000111int cpu_check_affinity(struct irq_data *d, const struct cpumask *dest)
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500112{
113 int cpu_dest;
114
115 /* timer and ipi have to always be received on all CPUs */
Thomas Gleixner337ce682011-03-24 17:48:47 +0100116 if (irqd_is_per_cpu(d))
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500117 return -EINVAL;
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500118
119 /* whatever mask they set, we just allow one CPU */
Thomas Gleixner1ed71e52014-03-04 20:43:40 +0000120 cpu_dest = cpumask_first_and(dest, cpu_online_mask);
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500121
Kyle McMartin8b6649c2009-02-16 03:20:54 -0500122 return cpu_dest;
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500123}
124
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000125static int cpu_set_affinity_irq(struct irq_data *d, const struct cpumask *dest,
126 bool force)
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500127{
Kyle McMartin8b6649c2009-02-16 03:20:54 -0500128 int cpu_dest;
129
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000130 cpu_dest = cpu_check_affinity(d, dest);
Kyle McMartin8b6649c2009-02-16 03:20:54 -0500131 if (cpu_dest < 0)
Yinghai Lud5dedd42009-04-27 17:59:21 -0700132 return -1;
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500133
Jiang Liud2109a12015-06-01 16:05:32 +0800134 cpumask_copy(irq_data_get_affinity_mask(d), dest);
Yinghai Lud5dedd42009-04-27 17:59:21 -0700135
136 return 0;
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500137}
138#endif
139
Thomas Gleixnerdfe07562009-06-10 19:56:04 +0000140static struct irq_chip cpu_interrupt_type = {
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000141 .name = "CPU",
142 .irq_mask = cpu_mask_irq,
143 .irq_unmask = cpu_unmask_irq,
144 .irq_ack = cpu_ack_irq,
145 .irq_eoi = cpu_eoi_irq,
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500146#ifdef CONFIG_SMP
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000147 .irq_set_affinity = cpu_set_affinity_irq,
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500148#endif
Ingo Molnarc0ad90a2006-06-29 02:24:44 -0700149 /* XXX: Needs to be written. We managed without it so far, but
150 * we really ought to write it.
151 */
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000152 .irq_retrigger = NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153};
154
Helge Dellercd85d552013-05-06 19:20:26 +0000155DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
156#define irq_stats(x) (&per_cpu(irq_stat, x))
157
158/*
159 * /proc/interrupts printing for arch specific interrupts
160 */
161int arch_show_interrupts(struct seq_file *p, int prec)
162{
163 int j;
164
165#ifdef CONFIG_DEBUG_STACKOVERFLOW
166 seq_printf(p, "%*s: ", prec, "STK");
167 for_each_online_cpu(j)
168 seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);
Helge Deller416821d2013-05-10 21:24:01 +0000169 seq_puts(p, " Kernel stack usage\n");
170# ifdef CONFIG_IRQSTACKS
171 seq_printf(p, "%*s: ", prec, "IST");
172 for_each_online_cpu(j)
173 seq_printf(p, "%10u ", irq_stats(j)->irq_stack_usage);
174 seq_puts(p, " Interrupt stack usage\n");
Helge Deller416821d2013-05-10 21:24:01 +0000175# endif
Helge Dellercd85d552013-05-06 19:20:26 +0000176#endif
177#ifdef CONFIG_SMP
178 seq_printf(p, "%*s: ", prec, "RES");
179 for_each_online_cpu(j)
180 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
Helge Deller416821d2013-05-10 21:24:01 +0000181 seq_puts(p, " Rescheduling interrupts\n");
Helge Deller0fc537d2013-05-07 21:42:47 +0000182#endif
Helge Dellerd0c3be82013-05-18 19:35:44 +0000183 seq_printf(p, "%*s: ", prec, "UAH");
184 for_each_online_cpu(j)
185 seq_printf(p, "%10u ", irq_stats(j)->irq_unaligned_count);
186 seq_puts(p, " Unaligned access handler traps\n");
187 seq_printf(p, "%*s: ", prec, "FPA");
188 for_each_online_cpu(j)
189 seq_printf(p, "%10u ", irq_stats(j)->irq_fpassist_count);
190 seq_puts(p, " Floating point assist traps\n");
Helge Dellercd85d552013-05-06 19:20:26 +0000191 seq_printf(p, "%*s: ", prec, "TLB");
192 for_each_online_cpu(j)
193 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
Helge Deller416821d2013-05-10 21:24:01 +0000194 seq_puts(p, " TLB shootdowns\n");
Helge Dellercd85d552013-05-06 19:20:26 +0000195 return 0;
196}
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198int show_interrupts(struct seq_file *p, void *v)
199{
200 int i = *(loff_t *) v, j;
201 unsigned long flags;
202
203 if (i == 0) {
204 seq_puts(p, " ");
205 for_each_online_cpu(j)
206 seq_printf(p, " CPU%d", j);
207
208#ifdef PARISC_IRQ_CR16_COUNTS
209 seq_printf(p, " [min/avg/max] (CPU cycle counts)");
210#endif
211 seq_putc(p, '\n');
212 }
213
214 if (i < NR_IRQS) {
Thomas Gleixner68f20f42011-03-28 13:47:54 +0200215 struct irq_desc *desc = irq_to_desc(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 struct irqaction *action;
217
Thomas Gleixner68f20f42011-03-28 13:47:54 +0200218 raw_spin_lock_irqsave(&desc->lock, flags);
219 action = desc->action;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 if (!action)
221 goto skip;
222 seq_printf(p, "%3d: ", i);
223#ifdef CONFIG_SMP
224 for_each_online_cpu(j)
Yinghai Ludee41022009-01-11 00:29:15 -0800225 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226#else
227 seq_printf(p, "%10u ", kstat_irqs(i));
228#endif
229
Thomas Gleixner68f20f42011-03-28 13:47:54 +0200230 seq_printf(p, " %14s", irq_desc_get_chip(desc)->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231#ifndef PARISC_IRQ_CR16_COUNTS
232 seq_printf(p, " %s", action->name);
233
234 while ((action = action->next))
235 seq_printf(p, ", %s", action->name);
236#else
237 for ( ;action; action = action->next) {
238 unsigned int k, avg, min, max;
239
240 min = max = action->cr16_hist[0];
241
242 for (avg = k = 0; k < PARISC_CR16_HIST_SIZE; k++) {
243 int hist = action->cr16_hist[k];
244
245 if (hist) {
246 avg += hist;
247 } else
248 break;
249
250 if (hist > max) max = hist;
251 if (hist < min) min = hist;
252 }
253
254 avg /= k;
255 seq_printf(p, " %s[%d/%d/%d]", action->name,
256 min,avg,max);
257 }
258#endif
259
260 seq_putc(p, '\n');
261 skip:
Thomas Gleixner68f20f42011-03-28 13:47:54 +0200262 raw_spin_unlock_irqrestore(&desc->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
264
Helge Dellercd85d552013-05-06 19:20:26 +0000265 if (i == NR_IRQS)
266 arch_show_interrupts(p, 3);
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return 0;
269}
270
271
272
273/*
274** The following form a "set": Virtual IRQ, Transaction Address, Trans Data.
275** Respectively, these map to IRQ region+EIRR, Processor HPA, EIRR bit.
276**
277** To use txn_XXX() interfaces, get a Virtual IRQ first.
278** Then use that to get the Transaction address and data.
279*/
280
Kyle McMartin5cfe87d2006-08-13 22:25:45 -0400281int cpu_claim_irq(unsigned int irq, struct irq_chip *type, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
Thomas Gleixner68f20f42011-03-28 13:47:54 +0200283 if (irq_has_action(irq))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return -EBUSY;
Thomas Gleixnere2f571d2011-03-24 17:41:44 +0100285 if (irq_get_chip(irq) != &cpu_interrupt_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 return -EBUSY;
287
Kyle McMartinba200852010-10-13 21:00:55 -0400288 /* for iosapic interrupts */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 if (type) {
Thomas Gleixnere2f571d2011-03-24 17:41:44 +0100290 irq_set_chip_and_handler(irq, type, handle_percpu_irq);
291 irq_set_chip_data(irq, data);
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000292 __cpu_unmask_irq(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
294 return 0;
295}
296
297int txn_claim_irq(int irq)
298{
299 return cpu_claim_irq(irq, NULL, NULL) ? -1 : irq;
300}
301
302/*
303 * The bits_wide parameter accommodates the limitations of the HW/SW which
304 * use these bits:
305 * Legacy PA I/O (GSC/NIO): 5 bits (architected EIM register)
306 * V-class (EPIC): 6 bits
307 * N/L/A-class (iosapic): 8 bits
308 * PCI 2.2 MSI: 16 bits
309 * Some PCI devices: 32 bits (Symbios SCSI/ATM/HyperFabric)
310 *
311 * On the service provider side:
312 * o PA 1.1 (and PA2.0 narrow mode) 5-bits (width of EIR register)
313 * o PA 2.0 wide mode 6-bits (per processor)
314 * o IA64 8-bits (0-256 total)
315 *
316 * So a Legacy PA I/O device on a PA 2.0 box can't use all the bits supported
317 * by the processor...and the N/L-class I/O subsystem supports more bits than
318 * PA2.0 has. The first case is the problem.
319 */
320int txn_alloc_irq(unsigned int bits_wide)
321{
322 int irq;
323
324 /* never return irq 0 cause that's the interval timer */
325 for (irq = CPU_IRQ_BASE + 1; irq <= CPU_IRQ_MAX; irq++) {
326 if (cpu_claim_irq(irq, NULL, NULL) < 0)
327 continue;
328 if ((irq - CPU_IRQ_BASE) >= (1 << bits_wide))
329 continue;
330 return irq;
331 }
332
333 /* unlikely, but be prepared */
334 return -1;
335}
336
Grant Grundler03afe222005-11-17 16:29:16 -0500337
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500338unsigned long txn_affinity_addr(unsigned int irq, int cpu)
339{
Grant Grundler03afe222005-11-17 16:29:16 -0500340#ifdef CONFIG_SMP
Thomas Gleixner4c4231ea2011-02-06 20:45:52 +0000341 struct irq_data *d = irq_get_irq_data(irq);
Jiang Liud2109a12015-06-01 16:05:32 +0800342 cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(cpu));
Grant Grundler03afe222005-11-17 16:29:16 -0500343#endif
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500344
Helge Delleref017be2008-12-31 03:12:10 +0000345 return per_cpu(cpu_data, cpu).txn_addr;
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500346}
347
Grant Grundler03afe222005-11-17 16:29:16 -0500348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349unsigned long txn_alloc_addr(unsigned int virt_irq)
350{
351 static int next_cpu = -1;
352
353 next_cpu++; /* assign to "next" CPU we want this bugger on */
354
355 /* validate entry */
Rusty Russellbd071e12009-03-16 14:19:37 +1030356 while ((next_cpu < nr_cpu_ids) &&
Helge Delleref017be2008-12-31 03:12:10 +0000357 (!per_cpu(cpu_data, next_cpu).txn_addr ||
358 !cpu_online(next_cpu)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 next_cpu++;
360
Rusty Russellbd071e12009-03-16 14:19:37 +1030361 if (next_cpu >= nr_cpu_ids)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 next_cpu = 0; /* nothing else, assign monarch */
363
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500364 return txn_affinity_addr(virt_irq, next_cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
367
368unsigned int txn_alloc_data(unsigned int virt_irq)
369{
370 return virt_irq - CPU_IRQ_BASE;
371}
372
James Bottomley70856892006-09-09 12:36:25 -0700373static inline int eirr_to_irq(unsigned long eirr)
374{
Kyle McMartin0c2de3c2006-12-30 19:24:37 -0500375 int bit = fls_long(eirr);
James Bottomley70856892006-09-09 12:36:25 -0700376 return (BITS_PER_LONG - bit) + TIMER_IRQ;
377}
378
Helge Dellerd96b51e2013-05-24 21:27:35 +0000379#ifdef CONFIG_IRQSTACKS
380/*
381 * IRQ STACK - used for irq handler
382 */
Helge Deller8f8201d2017-07-31 08:38:27 +0200383#define IRQ_STACK_SIZE (4096 << 3) /* 32k irq stack size */
Helge Dellerd96b51e2013-05-24 21:27:35 +0000384
385union irq_stack_union {
386 unsigned long stack[IRQ_STACK_SIZE/sizeof(unsigned long)];
387 volatile unsigned int slock[4];
388 volatile unsigned int lock[1];
389};
390
391DEFINE_PER_CPU(union irq_stack_union, irq_stack_union) = {
392 .slock = { 1,1,1,1 },
393 };
394#endif
395
396
Helge Deller93724502013-05-07 19:28:52 +0000397int sysctl_panic_on_stackoverflow = 1;
398
399static inline void stack_overflow_check(struct pt_regs *regs)
400{
401#ifdef CONFIG_DEBUG_STACKOVERFLOW
402 #define STACK_MARGIN (256*6)
403
404 /* Our stack starts directly behind the thread_info struct. */
405 unsigned long stack_start = (unsigned long) current_thread_info();
406 unsigned long sp = regs->gr[30];
Helge Dellercd85d552013-05-06 19:20:26 +0000407 unsigned long stack_usage;
408 unsigned int *last_usage;
Helge Deller416821d2013-05-10 21:24:01 +0000409 int cpu = smp_processor_id();
Helge Deller93724502013-05-07 19:28:52 +0000410
411 /* if sr7 != 0, we interrupted a userspace process which we do not want
412 * to check for stack overflow. We will only check the kernel stack. */
413 if (regs->sr[7])
414 return;
415
Helge Deller5bc64bd2017-07-08 23:25:14 +0200416 /* exit if already in panic */
417 if (sysctl_panic_on_stackoverflow < 0)
418 return;
419
Helge Dellercd85d552013-05-06 19:20:26 +0000420 /* calculate kernel stack usage */
421 stack_usage = sp - stack_start;
Helge Deller416821d2013-05-10 21:24:01 +0000422#ifdef CONFIG_IRQSTACKS
423 if (likely(stack_usage <= THREAD_SIZE))
424 goto check_kernel_stack; /* found kernel stack */
425
426 /* check irq stack usage */
427 stack_start = (unsigned long) &per_cpu(irq_stack_union, cpu).stack;
428 stack_usage = sp - stack_start;
429
430 last_usage = &per_cpu(irq_stat.irq_stack_usage, cpu);
431 if (unlikely(stack_usage > *last_usage))
432 *last_usage = stack_usage;
433
434 if (likely(stack_usage < (IRQ_STACK_SIZE - STACK_MARGIN)))
435 return;
436
437 pr_emerg("stackcheck: %s will most likely overflow irq stack "
438 "(sp:%lx, stk bottom-top:%lx-%lx)\n",
439 current->comm, sp, stack_start, stack_start + IRQ_STACK_SIZE);
440 goto panic_check;
441
442check_kernel_stack:
443#endif
444
445 /* check kernel stack usage */
446 last_usage = &per_cpu(irq_stat.kernel_stack_usage, cpu);
Helge Dellercd85d552013-05-06 19:20:26 +0000447
448 if (unlikely(stack_usage > *last_usage))
449 *last_usage = stack_usage;
450
451 if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))
Helge Deller93724502013-05-07 19:28:52 +0000452 return;
453
454 pr_emerg("stackcheck: %s will most likely overflow kernel stack "
455 "(sp:%lx, stk bottom-top:%lx-%lx)\n",
456 current->comm, sp, stack_start, stack_start + THREAD_SIZE);
457
Helge Deller416821d2013-05-10 21:24:01 +0000458#ifdef CONFIG_IRQSTACKS
459panic_check:
460#endif
Helge Deller5bc64bd2017-07-08 23:25:14 +0200461 if (sysctl_panic_on_stackoverflow) {
462 sysctl_panic_on_stackoverflow = -1; /* disable further checks */
Helge Deller93724502013-05-07 19:28:52 +0000463 panic("low stack detected by irq handler - check messages\n");
Helge Deller5bc64bd2017-07-08 23:25:14 +0200464 }
Helge Deller93724502013-05-07 19:28:52 +0000465#endif
466}
467
Helge Deller200c8802013-05-07 20:25:42 +0000468#ifdef CONFIG_IRQSTACKS
Helge Dellerd96b51e2013-05-24 21:27:35 +0000469/* in entry.S: */
470void call_on_stack(unsigned long p1, void *func, unsigned long new_stack);
Helge Deller200c8802013-05-07 20:25:42 +0000471
472static void execute_on_irq_stack(void *func, unsigned long param1)
473{
Helge Deller416821d2013-05-10 21:24:01 +0000474 union irq_stack_union *union_ptr;
Helge Deller200c8802013-05-07 20:25:42 +0000475 unsigned long irq_stack;
Helge Dellerd96b51e2013-05-24 21:27:35 +0000476 volatile unsigned int *irq_stack_in_use;
Helge Deller200c8802013-05-07 20:25:42 +0000477
Helge Deller416821d2013-05-10 21:24:01 +0000478 union_ptr = &per_cpu(irq_stack_union, smp_processor_id());
479 irq_stack = (unsigned long) &union_ptr->stack;
Helge Dellerd96b51e2013-05-24 21:27:35 +0000480 irq_stack = ALIGN(irq_stack + sizeof(irq_stack_union.slock),
Helge Deller416821d2013-05-10 21:24:01 +0000481 64); /* align for stack frame usage */
Helge Deller200c8802013-05-07 20:25:42 +0000482
Helge Deller416821d2013-05-10 21:24:01 +0000483 /* We may be called recursive. If we are already using the irq stack,
484 * just continue to use it. Use spinlocks to serialize
485 * the irq stack usage.
486 */
Helge Dellerd96b51e2013-05-24 21:27:35 +0000487 irq_stack_in_use = (volatile unsigned int *)__ldcw_align(union_ptr);
488 if (!__ldcw(irq_stack_in_use)) {
Helge Deller416821d2013-05-10 21:24:01 +0000489 void (*direct_call)(unsigned long p1) = func;
490
491 /* We are using the IRQ stack already.
492 * Do direct call on current stack. */
493 direct_call(param1);
494 return;
495 }
Helge Deller200c8802013-05-07 20:25:42 +0000496
497 /* This is where we switch to the IRQ stack. */
498 call_on_stack(param1, func, irq_stack);
499
Helge Deller416821d2013-05-10 21:24:01 +0000500 /* free up irq stack usage. */
Helge Dellerd96b51e2013-05-24 21:27:35 +0000501 *irq_stack_in_use = 1;
Helge Deller416821d2013-05-10 21:24:01 +0000502}
503
Frederic Weisbecker7d65f4a2013-09-05 15:49:45 +0200504void do_softirq_own_stack(void)
Helge Deller416821d2013-05-10 21:24:01 +0000505{
Frederic Weisbecker7d65f4a2013-09-05 15:49:45 +0200506 execute_on_irq_stack(__do_softirq, 0);
Helge Deller200c8802013-05-07 20:25:42 +0000507}
508#endif /* CONFIG_IRQSTACKS */
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510/* ONLY called from entry.S:intr_extint() */
511void do_cpu_irq_mask(struct pt_regs *regs)
512{
Matthew Wilcoxe11e30a2006-10-07 05:11:07 -0600513 struct pt_regs *old_regs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 unsigned long eirr_val;
James Bottomley70856892006-09-09 12:36:25 -0700515 int irq, cpu = smp_processor_id();
Jiang Liud2109a12015-06-01 16:05:32 +0800516 struct irq_data *irq_data;
Helge Dellerb1b4e432015-09-03 22:45:21 +0200517#ifdef CONFIG_SMP
James Bottomley70856892006-09-09 12:36:25 -0700518 cpumask_t dest;
519#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Matthew Wilcoxe11e30a2006-10-07 05:11:07 -0600521 old_regs = set_irq_regs(regs);
James Bottomley70856892006-09-09 12:36:25 -0700522 local_irq_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 irq_enter();
524
Grant Grundler462b5292007-06-10 16:31:41 -0600525 eirr_val = mfctl(23) & cpu_eiem & per_cpu(local_ack_eiem, cpu);
James Bottomley70856892006-09-09 12:36:25 -0700526 if (!eirr_val)
527 goto set_out;
528 irq = eirr_to_irq(eirr_val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Jiang Liud2109a12015-06-01 16:05:32 +0800530 irq_data = irq_get_irq_data(irq);
Helge Dellerb1b4e432015-09-03 22:45:21 +0200531
532 /* Filter out spurious interrupts, mostly from serial port at bootup */
533 if (unlikely(!irq_desc_has_action(irq_data_to_desc(irq_data))))
534 goto set_out;
535
536#ifdef CONFIG_SMP
Jiang Liud2109a12015-06-01 16:05:32 +0800537 cpumask_copy(&dest, irq_data_get_affinity_mask(irq_data));
538 if (irqd_is_per_cpu(irq_data) &&
Rusty Russell409e56f2015-03-05 10:49:18 +1030539 !cpumask_test_cpu(smp_processor_id(), &dest)) {
540 int cpu = cpumask_first(&dest);
James Bottomleyc2ab64d2005-11-17 16:28:37 -0500541
James Bottomley70856892006-09-09 12:36:25 -0700542 printk(KERN_DEBUG "redirecting irq %d from CPU %d to %d\n",
543 irq, smp_processor_id(), cpu);
544 gsc_writel(irq + CPU_IRQ_BASE,
Helge Delleref017be2008-12-31 03:12:10 +0000545 per_cpu(cpu_data, cpu).hpa);
James Bottomley70856892006-09-09 12:36:25 -0700546 goto set_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 }
James Bottomley70856892006-09-09 12:36:25 -0700548#endif
Helge Deller93724502013-05-07 19:28:52 +0000549 stack_overflow_check(regs);
Helge Deller200c8802013-05-07 20:25:42 +0000550
551#ifdef CONFIG_IRQSTACKS
552 execute_on_irq_stack(&generic_handle_irq, irq);
553#else
Kyle McMartinba200852010-10-13 21:00:55 -0400554 generic_handle_irq(irq);
Helge Deller200c8802013-05-07 20:25:42 +0000555#endif /* CONFIG_IRQSTACKS */
Grant Grundler3f902882005-11-17 16:26:20 -0500556
James Bottomley70856892006-09-09 12:36:25 -0700557 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 irq_exit();
Matthew Wilcoxe11e30a2006-10-07 05:11:07 -0600559 set_irq_regs(old_regs);
James Bottomley70856892006-09-09 12:36:25 -0700560 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
James Bottomley70856892006-09-09 12:36:25 -0700562 set_out:
Grant Grundler462b5292007-06-10 16:31:41 -0600563 set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
James Bottomley70856892006-09-09 12:36:25 -0700564 goto out;
565}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567static struct irqaction timer_action = {
568 .handler = timer_interrupt,
569 .name = "timer",
Peter Zijlstrab54cb232009-03-02 10:45:53 +0100570 .flags = IRQF_TIMER | IRQF_PERCPU | IRQF_IRQPOLL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571};
572
573#ifdef CONFIG_SMP
574static struct irqaction ipi_action = {
575 .handler = ipi_interrupt,
576 .name = "IPI",
Peter Zijlstrab54cb232009-03-02 10:45:53 +0100577 .flags = IRQF_PERCPU,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578};
579#endif
580
581static void claim_cpu_irqs(void)
582{
583 int i;
584 for (i = CPU_IRQ_BASE; i <= CPU_IRQ_MAX; i++) {
Thomas Gleixnere2f571d2011-03-24 17:41:44 +0100585 irq_set_chip_and_handler(i, &cpu_interrupt_type,
James Bottomleyd16cd292010-12-02 23:36:47 +0000586 handle_percpu_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 }
588
Thomas Gleixnere2f571d2011-03-24 17:41:44 +0100589 irq_set_handler(TIMER_IRQ, handle_percpu_irq);
Kyle McMartinba200852010-10-13 21:00:55 -0400590 setup_irq(TIMER_IRQ, &timer_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591#ifdef CONFIG_SMP
Thomas Gleixnere2f571d2011-03-24 17:41:44 +0100592 irq_set_handler(IPI_IRQ, handle_percpu_irq);
Kyle McMartinba200852010-10-13 21:00:55 -0400593 setup_irq(IPI_IRQ, &ipi_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594#endif
595}
596
597void __init init_IRQ(void)
598{
599 local_irq_disable(); /* PARANOID - should already be disabled */
600 mtctl(~0UL, 23); /* EIRR : clear all pending external intr */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601#ifdef CONFIG_SMP
John David Anglincac1f122011-06-12 01:46:41 +0000602 if (!cpu_eiem) {
603 claim_cpu_irqs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 cpu_eiem = EIEM_MASK(IPI_IRQ) | EIEM_MASK(TIMER_IRQ);
John David Anglincac1f122011-06-12 01:46:41 +0000605 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606#else
John David Anglincac1f122011-06-12 01:46:41 +0000607 claim_cpu_irqs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 cpu_eiem = EIEM_MASK(TIMER_IRQ);
609#endif
610 set_eiem(cpu_eiem); /* EIEM : enable all external intr */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}