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1 | /* | |
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> | |
25 | #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> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/types.h> | |
32 | #include <asm/io.h> | |
33 | ||
34 | #include <asm/smp.h> | |
35 | ||
36 | #undef PARISC_IRQ_CR16_COUNTS | |
37 | ||
38 | extern irqreturn_t timer_interrupt(int, void *); | |
39 | extern irqreturn_t ipi_interrupt(int, void *); | |
40 | ||
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 | */ | |
46 | static volatile unsigned long cpu_eiem = 0; | |
47 | ||
48 | /* | |
49 | ** local ACK bitmap ... habitually set to 1, but reset to zero | |
50 | ** between ->ack() and ->end() of the interrupt to prevent | |
51 | ** re-interruption of a processing interrupt. | |
52 | */ | |
53 | static DEFINE_PER_CPU(unsigned long, local_ack_eiem) = ~0UL; | |
54 | ||
55 | static void cpu_mask_irq(unsigned int irq) | |
56 | { | |
57 | unsigned long eirr_bit = EIEM_MASK(irq); | |
58 | ||
59 | cpu_eiem &= ~eirr_bit; | |
60 | /* 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 */ | |
64 | } | |
65 | ||
66 | static void cpu_unmask_irq(unsigned int irq) | |
67 | { | |
68 | unsigned long eirr_bit = EIEM_MASK(irq); | |
69 | ||
70 | cpu_eiem |= eirr_bit; | |
71 | ||
72 | /* 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(); | |
76 | } | |
77 | ||
78 | void no_ack_irq(unsigned int irq) { } | |
79 | void no_end_irq(unsigned int irq) { } | |
80 | ||
81 | void cpu_ack_irq(unsigned int irq) | |
82 | { | |
83 | unsigned long mask = EIEM_MASK(irq); | |
84 | int cpu = smp_processor_id(); | |
85 | ||
86 | /* Clear in EIEM so we can no longer process */ | |
87 | per_cpu(local_ack_eiem, cpu) &= ~mask; | |
88 | ||
89 | /* disable the interrupt */ | |
90 | set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu)); | |
91 | ||
92 | /* and now ack it */ | |
93 | mtctl(mask, 23); | |
94 | } | |
95 | ||
96 | void cpu_eoi_irq(unsigned int irq) | |
97 | { | |
98 | unsigned long mask = EIEM_MASK(irq); | |
99 | int cpu = smp_processor_id(); | |
100 | ||
101 | /* set it in the eiems---it's no longer in process */ | |
102 | per_cpu(local_ack_eiem, cpu) |= mask; | |
103 | ||
104 | /* enable the interrupt */ | |
105 | set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu)); | |
106 | } | |
107 | ||
108 | #ifdef CONFIG_SMP | |
109 | int cpu_check_affinity(unsigned int irq, const struct cpumask *dest) | |
110 | { | |
111 | int cpu_dest; | |
112 | ||
113 | /* timer and ipi have to always be received on all CPUs */ | |
114 | if (CHECK_IRQ_PER_CPU(irq)) { | |
115 | /* Bad linux design decision. The mask has already | |
116 | * been set; we must reset it */ | |
117 | cpumask_setall(irq_desc[irq].affinity); | |
118 | return -EINVAL; | |
119 | } | |
120 | ||
121 | /* whatever mask they set, we just allow one CPU */ | |
122 | cpu_dest = first_cpu(*dest); | |
123 | ||
124 | return cpu_dest; | |
125 | } | |
126 | ||
127 | static int cpu_set_affinity_irq(unsigned int irq, const struct cpumask *dest) | |
128 | { | |
129 | int cpu_dest; | |
130 | ||
131 | cpu_dest = cpu_check_affinity(irq, dest); | |
132 | if (cpu_dest < 0) | |
133 | return -1; | |
134 | ||
135 | cpumask_copy(irq_desc[irq].affinity, dest); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | #endif | |
140 | ||
141 | static struct irq_chip cpu_interrupt_type = { | |
142 | .name = "CPU", | |
143 | .mask = cpu_mask_irq, | |
144 | .unmask = cpu_unmask_irq, | |
145 | .ack = cpu_ack_irq, | |
146 | .eoi = cpu_eoi_irq, | |
147 | #ifdef CONFIG_SMP | |
148 | .set_affinity = cpu_set_affinity_irq, | |
149 | #endif | |
150 | /* XXX: Needs to be written. We managed without it so far, but | |
151 | * we really ought to write it. | |
152 | */ | |
153 | .retrigger = NULL, | |
154 | }; | |
155 | ||
156 | int show_interrupts(struct seq_file *p, void *v) | |
157 | { | |
158 | int i = *(loff_t *) v, j; | |
159 | unsigned long flags; | |
160 | ||
161 | if (i == 0) { | |
162 | seq_puts(p, " "); | |
163 | for_each_online_cpu(j) | |
164 | seq_printf(p, " CPU%d", j); | |
165 | ||
166 | #ifdef PARISC_IRQ_CR16_COUNTS | |
167 | seq_printf(p, " [min/avg/max] (CPU cycle counts)"); | |
168 | #endif | |
169 | seq_putc(p, '\n'); | |
170 | } | |
171 | ||
172 | if (i < NR_IRQS) { | |
173 | struct irqaction *action; | |
174 | ||
175 | raw_spin_lock_irqsave(&irq_desc[i].lock, flags); | |
176 | action = irq_desc[i].action; | |
177 | if (!action) | |
178 | goto skip; | |
179 | seq_printf(p, "%3d: ", i); | |
180 | #ifdef CONFIG_SMP | |
181 | for_each_online_cpu(j) | |
182 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); | |
183 | #else | |
184 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
185 | #endif | |
186 | ||
187 | seq_printf(p, " %14s", irq_desc[i].chip->name); | |
188 | #ifndef PARISC_IRQ_CR16_COUNTS | |
189 | seq_printf(p, " %s", action->name); | |
190 | ||
191 | while ((action = action->next)) | |
192 | seq_printf(p, ", %s", action->name); | |
193 | #else | |
194 | for ( ;action; action = action->next) { | |
195 | unsigned int k, avg, min, max; | |
196 | ||
197 | min = max = action->cr16_hist[0]; | |
198 | ||
199 | for (avg = k = 0; k < PARISC_CR16_HIST_SIZE; k++) { | |
200 | int hist = action->cr16_hist[k]; | |
201 | ||
202 | if (hist) { | |
203 | avg += hist; | |
204 | } else | |
205 | break; | |
206 | ||
207 | if (hist > max) max = hist; | |
208 | if (hist < min) min = hist; | |
209 | } | |
210 | ||
211 | avg /= k; | |
212 | seq_printf(p, " %s[%d/%d/%d]", action->name, | |
213 | min,avg,max); | |
214 | } | |
215 | #endif | |
216 | ||
217 | seq_putc(p, '\n'); | |
218 | skip: | |
219 | raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | ||
226 | ||
227 | /* | |
228 | ** The following form a "set": Virtual IRQ, Transaction Address, Trans Data. | |
229 | ** Respectively, these map to IRQ region+EIRR, Processor HPA, EIRR bit. | |
230 | ** | |
231 | ** To use txn_XXX() interfaces, get a Virtual IRQ first. | |
232 | ** Then use that to get the Transaction address and data. | |
233 | */ | |
234 | ||
235 | int cpu_claim_irq(unsigned int irq, struct irq_chip *type, void *data) | |
236 | { | |
237 | if (irq_desc[irq].action) | |
238 | return -EBUSY; | |
239 | if (irq_desc[irq].chip != &cpu_interrupt_type) | |
240 | return -EBUSY; | |
241 | ||
242 | /* for iosapic interrupts */ | |
243 | if (type) { | |
244 | set_irq_chip_and_handler(irq, type, handle_level_irq); | |
245 | set_irq_chip_data(irq, data); | |
246 | cpu_unmask_irq(irq); | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
251 | int txn_claim_irq(int irq) | |
252 | { | |
253 | return cpu_claim_irq(irq, NULL, NULL) ? -1 : irq; | |
254 | } | |
255 | ||
256 | /* | |
257 | * The bits_wide parameter accommodates the limitations of the HW/SW which | |
258 | * use these bits: | |
259 | * Legacy PA I/O (GSC/NIO): 5 bits (architected EIM register) | |
260 | * V-class (EPIC): 6 bits | |
261 | * N/L/A-class (iosapic): 8 bits | |
262 | * PCI 2.2 MSI: 16 bits | |
263 | * Some PCI devices: 32 bits (Symbios SCSI/ATM/HyperFabric) | |
264 | * | |
265 | * On the service provider side: | |
266 | * o PA 1.1 (and PA2.0 narrow mode) 5-bits (width of EIR register) | |
267 | * o PA 2.0 wide mode 6-bits (per processor) | |
268 | * o IA64 8-bits (0-256 total) | |
269 | * | |
270 | * So a Legacy PA I/O device on a PA 2.0 box can't use all the bits supported | |
271 | * by the processor...and the N/L-class I/O subsystem supports more bits than | |
272 | * PA2.0 has. The first case is the problem. | |
273 | */ | |
274 | int txn_alloc_irq(unsigned int bits_wide) | |
275 | { | |
276 | int irq; | |
277 | ||
278 | /* never return irq 0 cause that's the interval timer */ | |
279 | for (irq = CPU_IRQ_BASE + 1; irq <= CPU_IRQ_MAX; irq++) { | |
280 | if (cpu_claim_irq(irq, NULL, NULL) < 0) | |
281 | continue; | |
282 | if ((irq - CPU_IRQ_BASE) >= (1 << bits_wide)) | |
283 | continue; | |
284 | return irq; | |
285 | } | |
286 | ||
287 | /* unlikely, but be prepared */ | |
288 | return -1; | |
289 | } | |
290 | ||
291 | ||
292 | unsigned long txn_affinity_addr(unsigned int irq, int cpu) | |
293 | { | |
294 | #ifdef CONFIG_SMP | |
295 | cpumask_copy(irq_desc[irq].affinity, cpumask_of(cpu)); | |
296 | #endif | |
297 | ||
298 | return per_cpu(cpu_data, cpu).txn_addr; | |
299 | } | |
300 | ||
301 | ||
302 | unsigned long txn_alloc_addr(unsigned int virt_irq) | |
303 | { | |
304 | static int next_cpu = -1; | |
305 | ||
306 | next_cpu++; /* assign to "next" CPU we want this bugger on */ | |
307 | ||
308 | /* validate entry */ | |
309 | while ((next_cpu < nr_cpu_ids) && | |
310 | (!per_cpu(cpu_data, next_cpu).txn_addr || | |
311 | !cpu_online(next_cpu))) | |
312 | next_cpu++; | |
313 | ||
314 | if (next_cpu >= nr_cpu_ids) | |
315 | next_cpu = 0; /* nothing else, assign monarch */ | |
316 | ||
317 | return txn_affinity_addr(virt_irq, next_cpu); | |
318 | } | |
319 | ||
320 | ||
321 | unsigned int txn_alloc_data(unsigned int virt_irq) | |
322 | { | |
323 | return virt_irq - CPU_IRQ_BASE; | |
324 | } | |
325 | ||
326 | static inline int eirr_to_irq(unsigned long eirr) | |
327 | { | |
328 | int bit = fls_long(eirr); | |
329 | return (BITS_PER_LONG - bit) + TIMER_IRQ; | |
330 | } | |
331 | ||
332 | /* ONLY called from entry.S:intr_extint() */ | |
333 | void do_cpu_irq_mask(struct pt_regs *regs) | |
334 | { | |
335 | struct pt_regs *old_regs; | |
336 | unsigned long eirr_val; | |
337 | int irq, cpu = smp_processor_id(); | |
338 | #ifdef CONFIG_SMP | |
339 | cpumask_t dest; | |
340 | #endif | |
341 | ||
342 | old_regs = set_irq_regs(regs); | |
343 | local_irq_disable(); | |
344 | irq_enter(); | |
345 | ||
346 | eirr_val = mfctl(23) & cpu_eiem & per_cpu(local_ack_eiem, cpu); | |
347 | if (!eirr_val) | |
348 | goto set_out; | |
349 | irq = eirr_to_irq(eirr_val); | |
350 | ||
351 | #ifdef CONFIG_SMP | |
352 | cpumask_copy(&dest, irq_desc[irq].affinity); | |
353 | if (CHECK_IRQ_PER_CPU(irq_desc[irq].status) && | |
354 | !cpu_isset(smp_processor_id(), dest)) { | |
355 | int cpu = first_cpu(dest); | |
356 | ||
357 | printk(KERN_DEBUG "redirecting irq %d from CPU %d to %d\n", | |
358 | irq, smp_processor_id(), cpu); | |
359 | gsc_writel(irq + CPU_IRQ_BASE, | |
360 | per_cpu(cpu_data, cpu).hpa); | |
361 | goto set_out; | |
362 | } | |
363 | #endif | |
364 | generic_handle_irq(irq); | |
365 | ||
366 | out: | |
367 | irq_exit(); | |
368 | set_irq_regs(old_regs); | |
369 | return; | |
370 | ||
371 | set_out: | |
372 | set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu)); | |
373 | goto out; | |
374 | } | |
375 | ||
376 | static struct irqaction timer_action = { | |
377 | .handler = timer_interrupt, | |
378 | .name = "timer", | |
379 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_PERCPU | IRQF_IRQPOLL, | |
380 | }; | |
381 | ||
382 | #ifdef CONFIG_SMP | |
383 | static struct irqaction ipi_action = { | |
384 | .handler = ipi_interrupt, | |
385 | .name = "IPI", | |
386 | .flags = IRQF_DISABLED | IRQF_PERCPU, | |
387 | }; | |
388 | #endif | |
389 | ||
390 | static void claim_cpu_irqs(void) | |
391 | { | |
392 | int i; | |
393 | for (i = CPU_IRQ_BASE; i <= CPU_IRQ_MAX; i++) { | |
394 | set_irq_chip_and_handler(i, &cpu_interrupt_type, | |
395 | handle_level_irq); | |
396 | } | |
397 | ||
398 | set_irq_handler(TIMER_IRQ, handle_percpu_irq); | |
399 | setup_irq(TIMER_IRQ, &timer_action); | |
400 | #ifdef CONFIG_SMP | |
401 | set_irq_handler(IPI_IRQ, handle_percpu_irq); | |
402 | setup_irq(IPI_IRQ, &ipi_action); | |
403 | #endif | |
404 | } | |
405 | ||
406 | void __init init_IRQ(void) | |
407 | { | |
408 | local_irq_disable(); /* PARANOID - should already be disabled */ | |
409 | mtctl(~0UL, 23); /* EIRR : clear all pending external intr */ | |
410 | claim_cpu_irqs(); | |
411 | #ifdef CONFIG_SMP | |
412 | if (!cpu_eiem) | |
413 | cpu_eiem = EIEM_MASK(IPI_IRQ) | EIEM_MASK(TIMER_IRQ); | |
414 | #else | |
415 | cpu_eiem = EIEM_MASK(TIMER_IRQ); | |
416 | #endif | |
417 | set_eiem(cpu_eiem); /* EIEM : enable all external intr */ | |
418 | ||
419 | } | |
420 |