1
2
3
4
5#include <linux/types.h>
6#include <linux/threads.h>
7#include <linux/kernel.h>
8#include <linux/irq.h>
9#include <linux/debugfs.h>
10#include <linux/smp.h>
11#include <linux/interrupt.h>
12#include <linux/seq_file.h>
13#include <linux/init.h>
14#include <linux/cpu.h>
15#include <linux/of.h>
16#include <linux/slab.h>
17#include <linux/spinlock.h>
18#include <linux/delay.h>
19
20#include <asm/prom.h>
21#include <asm/io.h>
22#include <asm/smp.h>
23#include <asm/machdep.h>
24#include <asm/irq.h>
25#include <asm/errno.h>
26#include <asm/rtas.h>
27#include <asm/xics.h>
28#include <asm/firmware.h>
29
30
31const struct icp_ops *icp_ops;
32
33unsigned int xics_default_server = 0xff;
34unsigned int xics_default_distrib_server = 0;
35unsigned int xics_interrupt_server_size = 8;
36
37DEFINE_PER_CPU(struct xics_cppr, xics_cppr);
38
39struct irq_domain *xics_host;
40
41static struct ics *xics_ics;
42
43void xics_update_irq_servers(void)
44{
45 int i, j;
46 struct device_node *np;
47 u32 ilen;
48 const __be32 *ireg;
49 u32 hcpuid;
50
51
52 np = of_get_cpu_node(boot_cpuid, NULL);
53 BUG_ON(!np);
54
55 hcpuid = get_hard_smp_processor_id(boot_cpuid);
56 xics_default_server = xics_default_distrib_server = hcpuid;
57
58 pr_devel("xics: xics_default_server = 0x%x\n", xics_default_server);
59
60 ireg = of_get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen);
61 if (!ireg) {
62 of_node_put(np);
63 return;
64 }
65
66 i = ilen / sizeof(int);
67
68
69
70
71
72
73 for (j = 0; j < i; j += 2) {
74 if (be32_to_cpu(ireg[j]) == hcpuid) {
75 xics_default_distrib_server = be32_to_cpu(ireg[j+1]);
76 break;
77 }
78 }
79 pr_devel("xics: xics_default_distrib_server = 0x%x\n",
80 xics_default_distrib_server);
81 of_node_put(np);
82}
83
84
85
86
87void xics_set_cpu_giq(unsigned int gserver, unsigned int join)
88{
89#ifdef CONFIG_PPC_RTAS
90 int index;
91 int status;
92
93 if (!rtas_indicator_present(GLOBAL_INTERRUPT_QUEUE, NULL))
94 return;
95
96 index = (1UL << xics_interrupt_server_size) - 1 - gserver;
97
98 status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, index, join);
99
100 WARN(status < 0, "set-indicator(%d, %d, %u) returned %d\n",
101 GLOBAL_INTERRUPT_QUEUE, index, join, status);
102#endif
103}
104
105void xics_setup_cpu(void)
106{
107 icp_ops->set_priority(LOWEST_PRIORITY);
108
109 xics_set_cpu_giq(xics_default_distrib_server, 1);
110}
111
112void xics_mask_unknown_vec(unsigned int vec)
113{
114 pr_err("Interrupt 0x%x (real) is invalid, disabling it.\n", vec);
115
116 if (WARN_ON(!xics_ics))
117 return;
118 xics_ics->mask_unknown(xics_ics, vec);
119}
120
121
122#ifdef CONFIG_SMP
123
124static void xics_request_ipi(void)
125{
126 unsigned int ipi;
127
128 ipi = irq_create_mapping(xics_host, XICS_IPI);
129 BUG_ON(!ipi);
130
131
132
133
134 BUG_ON(request_irq(ipi, icp_ops->ipi_action,
135 IRQF_NO_DEBUG | IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL));
136}
137
138void __init xics_smp_probe(void)
139{
140
141 xics_request_ipi();
142
143
144 smp_ops->cause_ipi = icp_ops->cause_ipi;
145}
146
147#endif
148
149void xics_teardown_cpu(void)
150{
151 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
152
153
154
155
156
157 os_cppr->index = 0;
158 icp_ops->set_priority(0);
159 icp_ops->teardown_cpu();
160}
161
162void xics_kexec_teardown_cpu(int secondary)
163{
164 xics_teardown_cpu();
165
166 icp_ops->flush_ipi();
167
168
169
170
171
172 if (secondary)
173 xics_set_cpu_giq(xics_default_distrib_server, 0);
174}
175
176
177#ifdef CONFIG_HOTPLUG_CPU
178
179
180void xics_migrate_irqs_away(void)
181{
182 int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id();
183 unsigned int irq, virq;
184 struct irq_desc *desc;
185
186 pr_debug("%s: CPU %u\n", __func__, cpu);
187
188
189 if (hw_cpu == xics_default_server)
190 xics_update_irq_servers();
191
192
193 icp_ops->set_priority(0);
194
195
196 xics_set_cpu_giq(xics_default_distrib_server, 0);
197
198 for_each_irq_desc(virq, desc) {
199 struct irq_chip *chip;
200 long server;
201 unsigned long flags;
202 struct irq_data *irqd;
203
204
205 if (virq < NR_IRQS_LEGACY)
206 continue;
207
208 if (!desc->action)
209 continue;
210
211 irqd = irq_domain_get_irq_data(xics_host, virq);
212 if (!irqd)
213 continue;
214 irq = irqd_to_hwirq(irqd);
215
216 if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
217 continue;
218 chip = irq_desc_get_chip(desc);
219 if (!chip || !chip->irq_set_affinity)
220 continue;
221
222 raw_spin_lock_irqsave(&desc->lock, flags);
223
224
225 server = xics_ics->get_server(xics_ics, irq);
226 if (server < 0) {
227 pr_err("%s: Can't find server for irq %d/%x\n",
228 __func__, virq, irq);
229 goto unlock;
230 }
231
232
233
234
235
236 if (server != hw_cpu)
237 goto unlock;
238
239
240 if (cpu_online(cpu))
241 pr_warn("IRQ %u affinity broken off cpu %u\n",
242 virq, cpu);
243
244
245 raw_spin_unlock_irqrestore(&desc->lock, flags);
246 irq_set_affinity(virq, cpu_all_mask);
247 continue;
248unlock:
249 raw_spin_unlock_irqrestore(&desc->lock, flags);
250 }
251
252
253 mdelay(5);
254
255
256
257
258
259
260
261
262 icp_ops->set_priority(DEFAULT_PRIORITY);
263
264}
265#endif
266
267#ifdef CONFIG_SMP
268
269
270
271
272
273
274
275
276
277
278int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
279 unsigned int strict_check)
280{
281
282 if (!distribute_irqs)
283 return xics_default_server;
284
285 if (!cpumask_subset(cpu_possible_mask, cpumask)) {
286 int server = cpumask_first_and(cpu_online_mask, cpumask);
287
288 if (server < nr_cpu_ids)
289 return get_hard_smp_processor_id(server);
290
291 if (strict_check)
292 return -1;
293 }
294
295
296
297
298
299
300 if (cpumask_equal(cpu_online_mask, cpu_present_mask))
301 return xics_default_distrib_server;
302
303 return xics_default_server;
304}
305#endif
306
307static int xics_host_match(struct irq_domain *h, struct device_node *node,
308 enum irq_domain_bus_token bus_token)
309{
310 if (WARN_ON(!xics_ics))
311 return 0;
312 return xics_ics->host_match(xics_ics, node) ? 1 : 0;
313}
314
315
316static void xics_ipi_unmask(struct irq_data *d) { }
317static void xics_ipi_mask(struct irq_data *d) { }
318
319static struct irq_chip xics_ipi_chip = {
320 .name = "XICS",
321 .irq_eoi = NULL,
322 .irq_mask = xics_ipi_mask,
323 .irq_unmask = xics_ipi_unmask,
324};
325
326static int xics_host_map(struct irq_domain *domain, unsigned int virq,
327 irq_hw_number_t hwirq)
328{
329 pr_devel("xics: map virq %d, hwirq 0x%lx\n", virq, hwirq);
330
331
332
333
334
335
336 irq_clear_status_flags(virq, IRQ_LEVEL);
337
338
339 if (hwirq == XICS_IPI) {
340 irq_set_chip_and_handler(virq, &xics_ipi_chip,
341 handle_percpu_irq);
342 return 0;
343 }
344
345 if (WARN_ON(!xics_ics))
346 return -EINVAL;
347
348 if (xics_ics->check(xics_ics, hwirq))
349 return -EINVAL;
350
351
352 irq_domain_set_info(domain, virq, hwirq, xics_ics->chip,
353 xics_ics, handle_fasteoi_irq, NULL, NULL);
354
355 return 0;
356}
357
358static int xics_host_xlate(struct irq_domain *h, struct device_node *ct,
359 const u32 *intspec, unsigned int intsize,
360 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
361
362{
363 *out_hwirq = intspec[0];
364
365
366
367
368
369 if (intsize > 1) {
370 if (intspec[1] & 1)
371 *out_flags = IRQ_TYPE_LEVEL_LOW;
372 else
373 *out_flags = IRQ_TYPE_EDGE_RISING;
374 } else
375 *out_flags = IRQ_TYPE_LEVEL_LOW;
376
377 return 0;
378}
379
380int xics_set_irq_type(struct irq_data *d, unsigned int flow_type)
381{
382
383
384
385
386
387
388
389 if (flow_type == IRQ_TYPE_DEFAULT || flow_type == IRQ_TYPE_NONE)
390 flow_type = IRQ_TYPE_EDGE_RISING;
391
392 if (flow_type != IRQ_TYPE_EDGE_RISING &&
393 flow_type != IRQ_TYPE_LEVEL_LOW)
394 return -EINVAL;
395
396 irqd_set_trigger_type(d, flow_type);
397
398 return IRQ_SET_MASK_OK_NOCOPY;
399}
400
401int xics_retrigger(struct irq_data *data)
402{
403
404
405
406
407
408 xics_push_cppr(0);
409
410
411 return 0;
412}
413
414#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
415static int xics_host_domain_translate(struct irq_domain *d, struct irq_fwspec *fwspec,
416 unsigned long *hwirq, unsigned int *type)
417{
418 return xics_host_xlate(d, to_of_node(fwspec->fwnode), fwspec->param,
419 fwspec->param_count, hwirq, type);
420}
421
422static int xics_host_domain_alloc(struct irq_domain *domain, unsigned int virq,
423 unsigned int nr_irqs, void *arg)
424{
425 struct irq_fwspec *fwspec = arg;
426 irq_hw_number_t hwirq;
427 unsigned int type = IRQ_TYPE_NONE;
428 int i, rc;
429
430 rc = xics_host_domain_translate(domain, fwspec, &hwirq, &type);
431 if (rc)
432 return rc;
433
434 pr_debug("%s %d/%lx #%d\n", __func__, virq, hwirq, nr_irqs);
435
436 for (i = 0; i < nr_irqs; i++)
437 irq_domain_set_info(domain, virq + i, hwirq + i, xics_ics->chip,
438 xics_ics, handle_fasteoi_irq, NULL, NULL);
439
440 return 0;
441}
442
443static void xics_host_domain_free(struct irq_domain *domain,
444 unsigned int virq, unsigned int nr_irqs)
445{
446 pr_debug("%s %d #%d\n", __func__, virq, nr_irqs);
447}
448#endif
449
450static const struct irq_domain_ops xics_host_ops = {
451#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
452 .alloc = xics_host_domain_alloc,
453 .free = xics_host_domain_free,
454 .translate = xics_host_domain_translate,
455#endif
456 .match = xics_host_match,
457 .map = xics_host_map,
458 .xlate = xics_host_xlate,
459};
460
461static int __init xics_allocate_domain(void)
462{
463 struct fwnode_handle *fn;
464
465 fn = irq_domain_alloc_named_fwnode("XICS");
466 if (!fn)
467 return -ENOMEM;
468
469 xics_host = irq_domain_create_tree(fn, &xics_host_ops, NULL);
470 if (!xics_host) {
471 irq_domain_free_fwnode(fn);
472 return -ENOMEM;
473 }
474
475 irq_set_default_host(xics_host);
476 return 0;
477}
478
479void __init xics_register_ics(struct ics *ics)
480{
481 if (WARN_ONCE(xics_ics, "XICS: Source Controller is already defined !"))
482 return;
483 xics_ics = ics;
484}
485
486static void __init xics_get_server_size(void)
487{
488 struct device_node *np;
489 const __be32 *isize;
490
491
492
493
494 np = of_find_compatible_node(NULL, NULL, "ibm,ppc-xics");
495 if (!np)
496 return;
497
498 isize = of_get_property(np, "ibm,interrupt-server#-size", NULL);
499 if (isize)
500 xics_interrupt_server_size = be32_to_cpu(*isize);
501
502 of_node_put(np);
503}
504
505void __init xics_init(void)
506{
507 int rc = -1;
508
509
510 if (firmware_has_feature(FW_FEATURE_LPAR))
511 rc = icp_hv_init();
512 if (rc < 0) {
513 rc = icp_native_init();
514 if (rc == -ENODEV)
515 rc = icp_opal_init();
516 }
517 if (rc < 0) {
518 pr_warn("XICS: Cannot find a Presentation Controller !\n");
519 return;
520 }
521
522
523 ppc_md.get_irq = icp_ops->get_irq;
524
525
526 xics_ipi_chip.irq_eoi = icp_ops->eoi;
527
528
529 rc = ics_rtas_init();
530 if (rc < 0)
531 rc = ics_opal_init();
532 if (rc < 0)
533 rc = ics_native_init();
534 if (rc < 0)
535 pr_warn("XICS: Cannot find a Source Controller !\n");
536
537
538 xics_get_server_size();
539 xics_update_irq_servers();
540 rc = xics_allocate_domain();
541 if (rc < 0)
542 pr_err("XICS: Failed to create IRQ domain");
543 xics_setup_cpu();
544}
545