Commit | Line | Data |
---|---|---|
007e8f51 DG |
1 | /* |
2 | * arch/powerpc/platforms/pseries/xics.c | |
1da177e4 LT |
3 | * |
4 | * Copyright 2000 IBM Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
0ebfff14 BH |
11 | |
12 | #undef DEBUG | |
13 | ||
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/threads.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/gfp.h> | |
23 | #include <linux/radix-tree.h> | |
24 | #include <linux/cpu.h> | |
0ebfff14 | 25 | |
57cfb814 | 26 | #include <asm/firmware.h> |
1da177e4 LT |
27 | #include <asm/prom.h> |
28 | #include <asm/io.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/smp.h> | |
31 | #include <asm/rtas.h> | |
1da177e4 LT |
32 | #include <asm/hvcall.h> |
33 | #include <asm/machdep.h> | |
2227718c | 34 | #include <asm/i8259.h> |
1da177e4 | 35 | |
007e8f51 DG |
36 | #include "xics.h" |
37 | ||
1da177e4 LT |
38 | #define XICS_IPI 2 |
39 | #define XICS_IRQ_SPURIOUS 0 | |
40 | ||
41 | /* Want a priority other than 0. Various HW issues require this. */ | |
42 | #define DEFAULT_PRIORITY 5 | |
43 | ||
007e8f51 | 44 | /* |
1da177e4 | 45 | * Mark IPIs as higher priority so we can take them inside interrupts that |
6714465e | 46 | * arent marked IRQF_DISABLED |
1da177e4 LT |
47 | */ |
48 | #define IPI_PRIORITY 4 | |
49 | ||
50 | struct xics_ipl { | |
51 | union { | |
52 | u32 word; | |
53 | u8 bytes[4]; | |
54 | } xirr_poll; | |
55 | union { | |
56 | u32 word; | |
57 | u8 bytes[4]; | |
58 | } xirr; | |
59 | u32 dummy; | |
60 | union { | |
61 | u32 word; | |
62 | u8 bytes[4]; | |
63 | } qirr; | |
64 | }; | |
65 | ||
66 | static struct xics_ipl __iomem *xics_per_cpu[NR_CPUS]; | |
67 | ||
1da177e4 | 68 | static unsigned int default_server = 0xFF; |
26370322 AB |
69 | static unsigned int default_distrib_server = 0; |
70 | static unsigned int interrupt_server_size = 8; | |
1da177e4 | 71 | |
0ebfff14 BH |
72 | static struct irq_host *xics_host; |
73 | ||
1da177e4 LT |
74 | /* |
75 | * XICS only has a single IPI, so encode the messages per CPU | |
76 | */ | |
77 | struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned; | |
78 | ||
79 | /* RTAS service tokens */ | |
26370322 AB |
80 | static int ibm_get_xive; |
81 | static int ibm_set_xive; | |
82 | static int ibm_int_on; | |
83 | static int ibm_int_off; | |
1da177e4 | 84 | |
1da177e4 | 85 | |
b9e5b4e6 | 86 | /* Direct HW low level accessors */ |
1da177e4 | 87 | |
1da177e4 | 88 | |
0ebfff14 | 89 | static inline unsigned int direct_xirr_info_get(int n_cpu) |
1da177e4 LT |
90 | { |
91 | return in_be32(&xics_per_cpu[n_cpu]->xirr.word); | |
92 | } | |
93 | ||
b9e5b4e6 | 94 | static inline void direct_xirr_info_set(int n_cpu, int value) |
1da177e4 LT |
95 | { |
96 | out_be32(&xics_per_cpu[n_cpu]->xirr.word, value); | |
97 | } | |
98 | ||
b9e5b4e6 | 99 | static inline void direct_cppr_info(int n_cpu, u8 value) |
1da177e4 LT |
100 | { |
101 | out_8(&xics_per_cpu[n_cpu]->xirr.bytes[0], value); | |
102 | } | |
103 | ||
b9e5b4e6 | 104 | static inline void direct_qirr_info(int n_cpu, u8 value) |
1da177e4 LT |
105 | { |
106 | out_8(&xics_per_cpu[n_cpu]->qirr.bytes[0], value); | |
107 | } | |
108 | ||
1da177e4 | 109 | |
b9e5b4e6 | 110 | /* LPAR low level accessors */ |
1da177e4 | 111 | |
1da177e4 LT |
112 | |
113 | static inline long plpar_eoi(unsigned long xirr) | |
114 | { | |
115 | return plpar_hcall_norets(H_EOI, xirr); | |
116 | } | |
117 | ||
118 | static inline long plpar_cppr(unsigned long cppr) | |
119 | { | |
120 | return plpar_hcall_norets(H_CPPR, cppr); | |
121 | } | |
122 | ||
123 | static inline long plpar_ipi(unsigned long servernum, unsigned long mfrr) | |
124 | { | |
125 | return plpar_hcall_norets(H_IPI, servernum, mfrr); | |
126 | } | |
127 | ||
128 | static inline long plpar_xirr(unsigned long *xirr_ret) | |
129 | { | |
130 | unsigned long dummy; | |
131 | return plpar_hcall(H_XIRR, 0, 0, 0, 0, xirr_ret, &dummy, &dummy); | |
132 | } | |
133 | ||
0ebfff14 | 134 | static inline unsigned int lpar_xirr_info_get(int n_cpu) |
1da177e4 LT |
135 | { |
136 | unsigned long lpar_rc; | |
007e8f51 | 137 | unsigned long return_value; |
1da177e4 LT |
138 | |
139 | lpar_rc = plpar_xirr(&return_value); | |
706c8c93 | 140 | if (lpar_rc != H_SUCCESS) |
007e8f51 | 141 | panic(" bad return code xirr - rc = %lx \n", lpar_rc); |
0ebfff14 | 142 | return (unsigned int)return_value; |
1da177e4 LT |
143 | } |
144 | ||
b9e5b4e6 | 145 | static inline void lpar_xirr_info_set(int n_cpu, int value) |
1da177e4 LT |
146 | { |
147 | unsigned long lpar_rc; | |
148 | unsigned long val64 = value & 0xffffffff; | |
149 | ||
150 | lpar_rc = plpar_eoi(val64); | |
706c8c93 | 151 | if (lpar_rc != H_SUCCESS) |
1da177e4 | 152 | panic("bad return code EOI - rc = %ld, value=%lx\n", lpar_rc, |
007e8f51 | 153 | val64); |
1da177e4 LT |
154 | } |
155 | ||
b9e5b4e6 | 156 | static inline void lpar_cppr_info(int n_cpu, u8 value) |
1da177e4 LT |
157 | { |
158 | unsigned long lpar_rc; | |
159 | ||
160 | lpar_rc = plpar_cppr(value); | |
706c8c93 | 161 | if (lpar_rc != H_SUCCESS) |
007e8f51 | 162 | panic("bad return code cppr - rc = %lx\n", lpar_rc); |
1da177e4 LT |
163 | } |
164 | ||
b9e5b4e6 | 165 | static inline void lpar_qirr_info(int n_cpu , u8 value) |
1da177e4 LT |
166 | { |
167 | unsigned long lpar_rc; | |
168 | ||
169 | lpar_rc = plpar_ipi(get_hard_smp_processor_id(n_cpu), value); | |
706c8c93 | 170 | if (lpar_rc != H_SUCCESS) |
007e8f51 | 171 | panic("bad return code qirr - rc = %lx\n", lpar_rc); |
1da177e4 LT |
172 | } |
173 | ||
1da177e4 | 174 | |
b9e5b4e6 | 175 | /* High level handlers and init code */ |
1da177e4 | 176 | |
1da177e4 LT |
177 | |
178 | #ifdef CONFIG_SMP | |
0ebfff14 | 179 | static int get_irq_server(unsigned int virq) |
1da177e4 LT |
180 | { |
181 | unsigned int server; | |
182 | /* For the moment only implement delivery to all cpus or one cpu */ | |
0ebfff14 | 183 | cpumask_t cpumask = irq_desc[virq].affinity; |
1da177e4 LT |
184 | cpumask_t tmp = CPU_MASK_NONE; |
185 | ||
186 | if (!distribute_irqs) | |
187 | return default_server; | |
188 | ||
189 | if (cpus_equal(cpumask, CPU_MASK_ALL)) { | |
190 | server = default_distrib_server; | |
191 | } else { | |
192 | cpus_and(tmp, cpu_online_map, cpumask); | |
193 | ||
194 | if (cpus_empty(tmp)) | |
195 | server = default_distrib_server; | |
196 | else | |
197 | server = get_hard_smp_processor_id(first_cpu(tmp)); | |
198 | } | |
199 | ||
200 | return server; | |
201 | ||
202 | } | |
203 | #else | |
0ebfff14 | 204 | static int get_irq_server(unsigned int virq) |
1da177e4 LT |
205 | { |
206 | return default_server; | |
207 | } | |
208 | #endif | |
209 | ||
b9e5b4e6 BH |
210 | |
211 | static void xics_unmask_irq(unsigned int virq) | |
1da177e4 LT |
212 | { |
213 | unsigned int irq; | |
214 | int call_status; | |
215 | unsigned int server; | |
216 | ||
0ebfff14 BH |
217 | pr_debug("xics: unmask virq %d\n", virq); |
218 | ||
219 | irq = (unsigned int)irq_map[virq].hwirq; | |
220 | pr_debug(" -> map to hwirq 0x%x\n", irq); | |
221 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) | |
1da177e4 LT |
222 | return; |
223 | ||
224 | server = get_irq_server(virq); | |
b9e5b4e6 | 225 | |
1da177e4 LT |
226 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, |
227 | DEFAULT_PRIORITY); | |
228 | if (call_status != 0) { | |
26370322 AB |
229 | printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_set_xive " |
230 | "returned %d\n", irq, call_status); | |
231 | printk("set_xive %x, server %x\n", ibm_set_xive, server); | |
1da177e4 LT |
232 | return; |
233 | } | |
234 | ||
235 | /* Now unmask the interrupt (often a no-op) */ | |
236 | call_status = rtas_call(ibm_int_on, 1, 1, NULL, irq); | |
237 | if (call_status != 0) { | |
26370322 AB |
238 | printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_int_on " |
239 | "returned %d\n", irq, call_status); | |
1da177e4 LT |
240 | return; |
241 | } | |
242 | } | |
243 | ||
b9e5b4e6 | 244 | static void xics_mask_real_irq(unsigned int irq) |
1da177e4 LT |
245 | { |
246 | int call_status; | |
247 | unsigned int server; | |
248 | ||
249 | if (irq == XICS_IPI) | |
250 | return; | |
251 | ||
252 | call_status = rtas_call(ibm_int_off, 1, 1, NULL, irq); | |
253 | if (call_status != 0) { | |
26370322 AB |
254 | printk(KERN_ERR "xics_disable_real_irq: irq=%u: " |
255 | "ibm_int_off returned %d\n", irq, call_status); | |
1da177e4 LT |
256 | return; |
257 | } | |
258 | ||
259 | server = get_irq_server(irq); | |
260 | /* Have to set XIVE to 0xff to be able to remove a slot */ | |
261 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, 0xff); | |
262 | if (call_status != 0) { | |
26370322 AB |
263 | printk(KERN_ERR "xics_disable_irq: irq=%u: ibm_set_xive(0xff)" |
264 | " returned %d\n", irq, call_status); | |
1da177e4 LT |
265 | return; |
266 | } | |
267 | } | |
268 | ||
b9e5b4e6 | 269 | static void xics_mask_irq(unsigned int virq) |
1da177e4 LT |
270 | { |
271 | unsigned int irq; | |
272 | ||
0ebfff14 BH |
273 | pr_debug("xics: mask virq %d\n", virq); |
274 | ||
275 | irq = (unsigned int)irq_map[virq].hwirq; | |
276 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) | |
277 | return; | |
278 | xics_mask_real_irq(irq); | |
b9e5b4e6 BH |
279 | } |
280 | ||
0ebfff14 | 281 | static unsigned int xics_startup(unsigned int virq) |
b9e5b4e6 BH |
282 | { |
283 | unsigned int irq; | |
284 | ||
0ebfff14 BH |
285 | /* force a reverse mapping of the interrupt so it gets in the cache */ |
286 | irq = (unsigned int)irq_map[virq].hwirq; | |
287 | irq_radix_revmap(xics_host, irq); | |
1da177e4 | 288 | |
0ebfff14 | 289 | /* unmask it */ |
b9e5b4e6 BH |
290 | xics_unmask_irq(virq); |
291 | return 0; | |
292 | } | |
293 | ||
0ebfff14 | 294 | static void xics_eoi_direct(unsigned int virq) |
1da177e4 LT |
295 | { |
296 | int cpu = smp_processor_id(); | |
0ebfff14 | 297 | unsigned int irq = (unsigned int)irq_map[virq].hwirq; |
1da177e4 LT |
298 | |
299 | iosync(); | |
0ebfff14 | 300 | direct_xirr_info_set(cpu, (0xff << 24) | irq); |
1da177e4 LT |
301 | } |
302 | ||
b9e5b4e6 | 303 | |
0ebfff14 | 304 | static void xics_eoi_lpar(unsigned int virq) |
1da177e4 LT |
305 | { |
306 | int cpu = smp_processor_id(); | |
0ebfff14 | 307 | unsigned int irq = (unsigned int)irq_map[virq].hwirq; |
1da177e4 | 308 | |
b9e5b4e6 | 309 | iosync(); |
0ebfff14 | 310 | lpar_xirr_info_set(cpu, (0xff << 24) | irq); |
1da177e4 LT |
311 | } |
312 | ||
0ebfff14 | 313 | static inline unsigned int xics_remap_irq(unsigned int vec) |
1da177e4 | 314 | { |
0ebfff14 | 315 | unsigned int irq; |
1da177e4 | 316 | |
1da177e4 LT |
317 | vec &= 0x00ffffff; |
318 | ||
b9e5b4e6 BH |
319 | if (vec == XICS_IRQ_SPURIOUS) |
320 | return NO_IRQ; | |
0ebfff14 | 321 | irq = irq_radix_revmap(xics_host, vec); |
b9e5b4e6 | 322 | if (likely(irq != NO_IRQ)) |
0ebfff14 | 323 | return irq; |
b9e5b4e6 BH |
324 | |
325 | printk(KERN_ERR "Interrupt %u (real) is invalid," | |
326 | " disabling it.\n", vec); | |
327 | xics_mask_real_irq(vec); | |
328 | return NO_IRQ; | |
1da177e4 LT |
329 | } |
330 | ||
0ebfff14 | 331 | static unsigned int xics_get_irq_direct(struct pt_regs *regs) |
b9e5b4e6 BH |
332 | { |
333 | unsigned int cpu = smp_processor_id(); | |
1da177e4 | 334 | |
b9e5b4e6 BH |
335 | return xics_remap_irq(direct_xirr_info_get(cpu)); |
336 | } | |
337 | ||
0ebfff14 | 338 | static unsigned int xics_get_irq_lpar(struct pt_regs *regs) |
1da177e4 | 339 | { |
b9e5b4e6 | 340 | unsigned int cpu = smp_processor_id(); |
1da177e4 | 341 | |
b9e5b4e6 BH |
342 | return xics_remap_irq(lpar_xirr_info_get(cpu)); |
343 | } | |
344 | ||
345 | #ifdef CONFIG_SMP | |
1da177e4 | 346 | |
b9e5b4e6 BH |
347 | static irqreturn_t xics_ipi_dispatch(int cpu, struct pt_regs *regs) |
348 | { | |
1da177e4 LT |
349 | WARN_ON(cpu_is_offline(cpu)); |
350 | ||
351 | while (xics_ipi_message[cpu].value) { | |
352 | if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, | |
353 | &xics_ipi_message[cpu].value)) { | |
354 | mb(); | |
355 | smp_message_recv(PPC_MSG_CALL_FUNCTION, regs); | |
356 | } | |
357 | if (test_and_clear_bit(PPC_MSG_RESCHEDULE, | |
358 | &xics_ipi_message[cpu].value)) { | |
359 | mb(); | |
360 | smp_message_recv(PPC_MSG_RESCHEDULE, regs); | |
361 | } | |
362 | #if 0 | |
363 | if (test_and_clear_bit(PPC_MSG_MIGRATE_TASK, | |
364 | &xics_ipi_message[cpu].value)) { | |
365 | mb(); | |
366 | smp_message_recv(PPC_MSG_MIGRATE_TASK, regs); | |
367 | } | |
368 | #endif | |
cc532915 | 369 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
1da177e4 LT |
370 | if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, |
371 | &xics_ipi_message[cpu].value)) { | |
372 | mb(); | |
373 | smp_message_recv(PPC_MSG_DEBUGGER_BREAK, regs); | |
374 | } | |
375 | #endif | |
376 | } | |
377 | return IRQ_HANDLED; | |
378 | } | |
379 | ||
b9e5b4e6 BH |
380 | static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id, struct pt_regs *regs) |
381 | { | |
382 | int cpu = smp_processor_id(); | |
383 | ||
384 | direct_qirr_info(cpu, 0xff); | |
385 | ||
386 | return xics_ipi_dispatch(cpu, regs); | |
387 | } | |
388 | ||
389 | static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id, struct pt_regs *regs) | |
390 | { | |
391 | int cpu = smp_processor_id(); | |
392 | ||
393 | lpar_qirr_info(cpu, 0xff); | |
394 | ||
395 | return xics_ipi_dispatch(cpu, regs); | |
396 | } | |
397 | ||
1da177e4 LT |
398 | void xics_cause_IPI(int cpu) |
399 | { | |
b9e5b4e6 BH |
400 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
401 | lpar_qirr_info(cpu, IPI_PRIORITY); | |
402 | else | |
403 | direct_qirr_info(cpu, IPI_PRIORITY); | |
1da177e4 | 404 | } |
b9e5b4e6 | 405 | |
6c80a21c | 406 | #endif /* CONFIG_SMP */ |
1da177e4 | 407 | |
b9e5b4e6 BH |
408 | static void xics_set_cpu_priority(int cpu, unsigned char cppr) |
409 | { | |
410 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
411 | lpar_cppr_info(cpu, cppr); | |
412 | else | |
413 | direct_cppr_info(cpu, cppr); | |
414 | iosync(); | |
415 | } | |
416 | ||
417 | static void xics_set_affinity(unsigned int virq, cpumask_t cpumask) | |
418 | { | |
419 | unsigned int irq; | |
420 | int status; | |
421 | int xics_status[2]; | |
422 | unsigned long newmask; | |
423 | cpumask_t tmp = CPU_MASK_NONE; | |
424 | ||
0ebfff14 BH |
425 | irq = (unsigned int)irq_map[virq].hwirq; |
426 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) | |
b9e5b4e6 BH |
427 | return; |
428 | ||
429 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); | |
430 | ||
431 | if (status) { | |
432 | printk(KERN_ERR "xics_set_affinity: irq=%u ibm,get-xive " | |
433 | "returns %d\n", irq, status); | |
434 | return; | |
435 | } | |
436 | ||
437 | /* For the moment only implement delivery to all cpus or one cpu */ | |
438 | if (cpus_equal(cpumask, CPU_MASK_ALL)) { | |
439 | newmask = default_distrib_server; | |
440 | } else { | |
441 | cpus_and(tmp, cpu_online_map, cpumask); | |
442 | if (cpus_empty(tmp)) | |
443 | return; | |
444 | newmask = get_hard_smp_processor_id(first_cpu(tmp)); | |
445 | } | |
446 | ||
447 | status = rtas_call(ibm_set_xive, 3, 1, NULL, | |
448 | irq, newmask, xics_status[1]); | |
449 | ||
450 | if (status) { | |
451 | printk(KERN_ERR "xics_set_affinity: irq=%u ibm,set-xive " | |
452 | "returns %d\n", irq, status); | |
453 | return; | |
454 | } | |
455 | } | |
456 | ||
0ebfff14 BH |
457 | void xics_setup_cpu(void) |
458 | { | |
459 | int cpu = smp_processor_id(); | |
460 | ||
461 | xics_set_cpu_priority(cpu, 0xff); | |
462 | ||
463 | /* | |
464 | * Put the calling processor into the GIQ. This is really only | |
465 | * necessary from a secondary thread as the OF start-cpu interface | |
466 | * performs this function for us on primary threads. | |
467 | * | |
468 | * XXX: undo of teardown on kexec needs this too, as may hotplug | |
469 | */ | |
470 | rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE, | |
471 | (1UL << interrupt_server_size) - 1 - default_distrib_server, 1); | |
472 | } | |
473 | ||
474 | ||
b9e5b4e6 BH |
475 | static struct irq_chip xics_pic_direct = { |
476 | .typename = " XICS ", | |
477 | .startup = xics_startup, | |
478 | .mask = xics_mask_irq, | |
479 | .unmask = xics_unmask_irq, | |
480 | .eoi = xics_eoi_direct, | |
481 | .set_affinity = xics_set_affinity | |
482 | }; | |
483 | ||
484 | ||
485 | static struct irq_chip xics_pic_lpar = { | |
486 | .typename = " XICS ", | |
487 | .startup = xics_startup, | |
488 | .mask = xics_mask_irq, | |
489 | .unmask = xics_unmask_irq, | |
490 | .eoi = xics_eoi_lpar, | |
491 | .set_affinity = xics_set_affinity | |
492 | }; | |
493 | ||
494 | ||
0ebfff14 | 495 | static int xics_host_match(struct irq_host *h, struct device_node *node) |
1da177e4 | 496 | { |
0ebfff14 BH |
497 | /* IBM machines have interrupt parents of various funky types for things |
498 | * like vdevices, events, etc... The trick we use here is to match | |
499 | * everything here except the legacy 8259 which is compatible "chrp,iic" | |
500 | */ | |
501 | return !device_is_compatible(node, "chrp,iic"); | |
502 | } | |
1da177e4 | 503 | |
0ebfff14 BH |
504 | static int xics_host_map_direct(struct irq_host *h, unsigned int virq, |
505 | irq_hw_number_t hw, unsigned int flags) | |
506 | { | |
507 | unsigned int sense = flags & IRQ_TYPE_SENSE_MASK; | |
1da177e4 | 508 | |
0ebfff14 BH |
509 | pr_debug("xics: map_direct virq %d, hwirq 0x%lx, flags: 0x%x\n", |
510 | virq, hw, flags); | |
511 | ||
512 | if (sense && sense != IRQ_TYPE_LEVEL_LOW) | |
513 | printk(KERN_WARNING "xics: using unsupported sense 0x%x" | |
514 | " for irq %d (h: 0x%lx)\n", flags, virq, hw); | |
515 | ||
516 | get_irq_desc(virq)->status |= IRQ_LEVEL; | |
517 | set_irq_chip_and_handler(virq, &xics_pic_direct, handle_fasteoi_irq); | |
518 | return 0; | |
519 | } | |
520 | ||
521 | static int xics_host_map_lpar(struct irq_host *h, unsigned int virq, | |
522 | irq_hw_number_t hw, unsigned int flags) | |
523 | { | |
524 | unsigned int sense = flags & IRQ_TYPE_SENSE_MASK; | |
525 | ||
526 | pr_debug("xics: map_lpar virq %d, hwirq 0x%lx, flags: 0x%x\n", | |
527 | virq, hw, flags); | |
528 | ||
529 | if (sense && sense != IRQ_TYPE_LEVEL_LOW) | |
530 | printk(KERN_WARNING "xics: using unsupported sense 0x%x" | |
531 | " for irq %d (h: 0x%lx)\n", flags, virq, hw); | |
532 | ||
533 | get_irq_desc(virq)->status |= IRQ_LEVEL; | |
534 | set_irq_chip_and_handler(virq, &xics_pic_lpar, handle_fasteoi_irq); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | static int xics_host_xlate(struct irq_host *h, struct device_node *ct, | |
539 | u32 *intspec, unsigned int intsize, | |
540 | irq_hw_number_t *out_hwirq, unsigned int *out_flags) | |
541 | ||
542 | { | |
543 | /* Current xics implementation translates everything | |
544 | * to level. It is not technically right for MSIs but this | |
545 | * is irrelevant at this point. We might get smarter in the future | |
6c80a21c | 546 | */ |
0ebfff14 BH |
547 | *out_hwirq = intspec[0]; |
548 | *out_flags = IRQ_TYPE_LEVEL_LOW; | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | static struct irq_host_ops xics_host_direct_ops = { | |
554 | .match = xics_host_match, | |
555 | .map = xics_host_map_direct, | |
556 | .xlate = xics_host_xlate, | |
557 | }; | |
558 | ||
559 | static struct irq_host_ops xics_host_lpar_ops = { | |
560 | .match = xics_host_match, | |
561 | .map = xics_host_map_lpar, | |
562 | .xlate = xics_host_xlate, | |
563 | }; | |
564 | ||
565 | static void __init xics_init_host(void) | |
566 | { | |
567 | struct irq_host_ops *ops; | |
568 | ||
569 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
570 | ops = &xics_host_lpar_ops; | |
571 | else | |
572 | ops = &xics_host_direct_ops; | |
573 | xics_host = irq_alloc_host(IRQ_HOST_MAP_TREE, 0, ops, | |
574 | XICS_IRQ_SPURIOUS); | |
575 | BUG_ON(xics_host == NULL); | |
576 | irq_set_default_host(xics_host); | |
6c80a21c | 577 | } |
1da177e4 | 578 | |
0ebfff14 BH |
579 | static void __init xics_map_one_cpu(int hw_id, unsigned long addr, |
580 | unsigned long size) | |
1da177e4 | 581 | { |
0ebfff14 | 582 | #ifdef CONFIG_SMP |
1da177e4 | 583 | int i; |
1da177e4 | 584 | |
0ebfff14 BH |
585 | /* This may look gross but it's good enough for now, we don't quite |
586 | * have a hard -> linux processor id matching. | |
587 | */ | |
588 | for_each_possible_cpu(i) { | |
589 | if (!cpu_present(i)) | |
590 | continue; | |
591 | if (hw_id == get_hard_smp_processor_id(i)) { | |
592 | xics_per_cpu[i] = ioremap(addr, size); | |
593 | return; | |
594 | } | |
595 | } | |
596 | #else | |
597 | if (hw_id != 0) | |
598 | return; | |
599 | xics_per_cpu[0] = ioremap(addr, size); | |
600 | #endif /* CONFIG_SMP */ | |
601 | } | |
1da177e4 | 602 | |
0ebfff14 BH |
603 | static void __init xics_init_one_node(struct device_node *np, |
604 | unsigned int *indx) | |
605 | { | |
606 | unsigned int ilen; | |
607 | u32 *ireg; | |
1da177e4 | 608 | |
0ebfff14 BH |
609 | /* This code does the theorically broken assumption that the interrupt |
610 | * server numbers are the same as the hard CPU numbers. | |
611 | * This happens to be the case so far but we are playing with fire... | |
612 | * should be fixed one of these days. -BenH. | |
613 | */ | |
614 | ireg = (u32 *)get_property(np, "ibm,interrupt-server-ranges", NULL); | |
1da177e4 | 615 | |
0ebfff14 BH |
616 | /* Do that ever happen ? we'll know soon enough... but even good'old |
617 | * f80 does have that property .. | |
618 | */ | |
619 | WARN_ON(ireg == NULL); | |
1da177e4 LT |
620 | if (ireg) { |
621 | /* | |
622 | * set node starting index for this node | |
623 | */ | |
0ebfff14 | 624 | *indx = *ireg; |
1da177e4 | 625 | } |
0ebfff14 | 626 | ireg = (u32 *)get_property(np, "reg", &ilen); |
1da177e4 LT |
627 | if (!ireg) |
628 | panic("xics_init_IRQ: can't find interrupt reg property"); | |
007e8f51 | 629 | |
0ebfff14 BH |
630 | while (ilen >= (4 * sizeof(u32))) { |
631 | unsigned long addr, size; | |
632 | ||
633 | /* XXX Use proper OF parsing code here !!! */ | |
634 | addr = (unsigned long)*ireg++ << 32; | |
635 | ilen -= sizeof(u32); | |
636 | addr |= *ireg++; | |
637 | ilen -= sizeof(u32); | |
638 | size = (unsigned long)*ireg++ << 32; | |
639 | ilen -= sizeof(u32); | |
640 | size |= *ireg++; | |
641 | ilen -= sizeof(u32); | |
642 | xics_map_one_cpu(*indx, addr, size); | |
643 | (*indx)++; | |
644 | } | |
645 | } | |
646 | ||
647 | ||
648 | static void __init xics_setup_8259_cascade(void) | |
649 | { | |
650 | struct device_node *np, *old, *found = NULL; | |
651 | int cascade, naddr; | |
652 | u32 *addrp; | |
653 | unsigned long intack = 0; | |
654 | ||
655 | for_each_node_by_type(np, "interrupt-controller") | |
656 | if (device_is_compatible(np, "chrp,iic")) { | |
657 | found = np; | |
658 | break; | |
659 | } | |
660 | if (found == NULL) { | |
661 | printk(KERN_DEBUG "xics: no ISA interrupt controller\n"); | |
662 | return; | |
1da177e4 | 663 | } |
0ebfff14 BH |
664 | cascade = irq_of_parse_and_map(found, 0); |
665 | if (cascade == NO_IRQ) { | |
666 | printk(KERN_ERR "xics: failed to map cascade interrupt"); | |
667 | return; | |
668 | } | |
669 | pr_debug("xics: cascade mapped to irq %d\n", cascade); | |
670 | ||
671 | for (old = of_node_get(found); old != NULL ; old = np) { | |
672 | np = of_get_parent(old); | |
673 | of_node_put(old); | |
674 | if (np == NULL) | |
675 | break; | |
676 | if (strcmp(np->name, "pci") != 0) | |
677 | continue; | |
678 | addrp = (u32 *)get_property(np, "8259-interrupt-acknowledge", NULL); | |
679 | if (addrp == NULL) | |
680 | continue; | |
681 | naddr = prom_n_addr_cells(np); | |
682 | intack = addrp[naddr-1]; | |
683 | if (naddr > 1) | |
684 | intack |= ((unsigned long)addrp[naddr-2]) << 32; | |
685 | } | |
686 | if (intack) | |
687 | printk(KERN_DEBUG "xics: PCI 8259 intack at 0x%016lx\n", intack); | |
688 | i8259_init(found, intack); | |
689 | of_node_put(found); | |
690 | set_irq_chained_handler(cascade, pseries_8259_cascade); | |
691 | } | |
1da177e4 | 692 | |
0ebfff14 BH |
693 | void __init xics_init_IRQ(void) |
694 | { | |
695 | int i; | |
696 | struct device_node *np; | |
697 | u32 *ireg, ilen, indx = 0; | |
698 | int found = 0; | |
699 | ||
700 | ppc64_boot_msg(0x20, "XICS Init"); | |
701 | ||
702 | ibm_get_xive = rtas_token("ibm,get-xive"); | |
703 | ibm_set_xive = rtas_token("ibm,set-xive"); | |
704 | ibm_int_on = rtas_token("ibm,int-on"); | |
705 | ibm_int_off = rtas_token("ibm,int-off"); | |
706 | ||
707 | for_each_node_by_type(np, "PowerPC-External-Interrupt-Presentation") { | |
708 | found = 1; | |
709 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
710 | break; | |
711 | xics_init_one_node(np, &indx); | |
712 | } | |
713 | if (found == 0) | |
714 | return; | |
715 | ||
716 | xics_init_host(); | |
1da177e4 LT |
717 | |
718 | /* Find the server numbers for the boot cpu. */ | |
719 | for (np = of_find_node_by_type(NULL, "cpu"); | |
720 | np; | |
721 | np = of_find_node_by_type(np, "cpu")) { | |
0ebfff14 | 722 | ireg = (u32 *)get_property(np, "reg", &ilen); |
4df20460 | 723 | if (ireg && ireg[0] == get_hard_smp_processor_id(boot_cpuid)) { |
0ebfff14 BH |
724 | ireg = (u32 *)get_property(np, |
725 | "ibm,ppc-interrupt-gserver#s", | |
726 | &ilen); | |
1da177e4 LT |
727 | i = ilen / sizeof(int); |
728 | if (ireg && i > 0) { | |
729 | default_server = ireg[0]; | |
0ebfff14 BH |
730 | /* take last element */ |
731 | default_distrib_server = ireg[i-1]; | |
1da177e4 | 732 | } |
0ebfff14 | 733 | ireg = (u32 *)get_property(np, |
1da177e4 LT |
734 | "ibm,interrupt-server#-size", NULL); |
735 | if (ireg) | |
736 | interrupt_server_size = *ireg; | |
737 | break; | |
738 | } | |
739 | } | |
740 | of_node_put(np); | |
741 | ||
0ebfff14 BH |
742 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
743 | ppc_md.get_irq = xics_get_irq_lpar; | |
744 | else | |
b9e5b4e6 | 745 | ppc_md.get_irq = xics_get_irq_direct; |
1da177e4 | 746 | |
6c80a21c | 747 | xics_setup_cpu(); |
1da177e4 | 748 | |
0ebfff14 | 749 | xics_setup_8259_cascade(); |
1da177e4 | 750 | |
0ebfff14 | 751 | ppc64_boot_msg(0x21, "XICS Done"); |
1da177e4 | 752 | } |
b9e5b4e6 | 753 | |
1da177e4 LT |
754 | |
755 | #ifdef CONFIG_SMP | |
756 | void xics_request_IPIs(void) | |
757 | { | |
0ebfff14 BH |
758 | unsigned int ipi; |
759 | ||
760 | ipi = irq_create_mapping(xics_host, XICS_IPI, 0); | |
761 | BUG_ON(ipi == NO_IRQ); | |
1da177e4 | 762 | |
6714465e TG |
763 | /* |
764 | * IPIs are marked IRQF_DISABLED as they must run with irqs | |
765 | * disabled | |
766 | */ | |
0ebfff14 | 767 | set_irq_handler(ipi, handle_percpu_irq); |
b9e5b4e6 | 768 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
0ebfff14 BH |
769 | request_irq(ipi, xics_ipi_action_lpar, IRQF_DISABLED, |
770 | "IPI", NULL); | |
b9e5b4e6 | 771 | else |
0ebfff14 BH |
772 | request_irq(ipi, xics_ipi_action_direct, IRQF_DISABLED, |
773 | "IPI", NULL); | |
1da177e4 | 774 | } |
b9e5b4e6 | 775 | #endif /* CONFIG_SMP */ |
1da177e4 | 776 | |
6d22d85a | 777 | void xics_teardown_cpu(int secondary) |
fce0d574 S |
778 | { |
779 | int cpu = smp_processor_id(); | |
0ebfff14 BH |
780 | unsigned int ipi; |
781 | struct irq_desc *desc; | |
fce0d574 | 782 | |
0ebfff14 | 783 | xics_set_cpu_priority(cpu, 0); |
81bbbe92 HM |
784 | |
785 | /* | |
786 | * we need to EOI the IPI if we got here from kexec down IPI | |
787 | * | |
788 | * probably need to check all the other interrupts too | |
789 | * should we be flagging idle loop instead? | |
790 | * or creating some task to be scheduled? | |
791 | */ | |
0ebfff14 BH |
792 | |
793 | ipi = irq_find_mapping(xics_host, XICS_IPI); | |
794 | if (ipi == XICS_IRQ_SPURIOUS) | |
795 | return; | |
796 | desc = get_irq_desc(ipi); | |
b9e5b4e6 BH |
797 | if (desc->chip && desc->chip->eoi) |
798 | desc->chip->eoi(XICS_IPI); | |
81bbbe92 | 799 | |
fce0d574 | 800 | /* |
6d22d85a PM |
801 | * Some machines need to have at least one cpu in the GIQ, |
802 | * so leave the master cpu in the group. | |
fce0d574 | 803 | */ |
81bbbe92 | 804 | if (secondary) |
6d22d85a | 805 | rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE, |
0ebfff14 BH |
806 | (1UL << interrupt_server_size) - 1 - |
807 | default_distrib_server, 0); | |
fce0d574 S |
808 | } |
809 | ||
1da177e4 LT |
810 | #ifdef CONFIG_HOTPLUG_CPU |
811 | ||
812 | /* Interrupts are disabled. */ | |
813 | void xics_migrate_irqs_away(void) | |
814 | { | |
815 | int status; | |
816 | unsigned int irq, virq, cpu = smp_processor_id(); | |
817 | ||
818 | /* Reject any interrupt that was queued to us... */ | |
b9e5b4e6 | 819 | xics_set_cpu_priority(cpu, 0); |
1da177e4 LT |
820 | |
821 | /* remove ourselves from the global interrupt queue */ | |
822 | status = rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE, | |
823 | (1UL << interrupt_server_size) - 1 - default_distrib_server, 0); | |
824 | WARN_ON(status < 0); | |
825 | ||
826 | /* Allow IPIs again... */ | |
b9e5b4e6 | 827 | xics_set_cpu_priority(cpu, DEFAULT_PRIORITY); |
1da177e4 LT |
828 | |
829 | for_each_irq(virq) { | |
b9e5b4e6 | 830 | struct irq_desc *desc; |
1da177e4 LT |
831 | int xics_status[2]; |
832 | unsigned long flags; | |
833 | ||
834 | /* We cant set affinity on ISA interrupts */ | |
0ebfff14 | 835 | if (virq < NUM_ISA_INTERRUPTS) |
1da177e4 | 836 | continue; |
0ebfff14 BH |
837 | if (irq_map[virq].host != xics_host) |
838 | continue; | |
839 | irq = (unsigned int)irq_map[virq].hwirq; | |
1da177e4 | 840 | /* We need to get IPIs still. */ |
0ebfff14 | 841 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) |
1da177e4 | 842 | continue; |
0ebfff14 | 843 | desc = get_irq_desc(virq); |
1da177e4 LT |
844 | |
845 | /* We only need to migrate enabled IRQS */ | |
d1bef4ed | 846 | if (desc == NULL || desc->chip == NULL |
1da177e4 | 847 | || desc->action == NULL |
d1bef4ed | 848 | || desc->chip->set_affinity == NULL) |
1da177e4 LT |
849 | continue; |
850 | ||
851 | spin_lock_irqsave(&desc->lock, flags); | |
852 | ||
853 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); | |
854 | if (status) { | |
26370322 | 855 | printk(KERN_ERR "migrate_irqs_away: irq=%u " |
1da177e4 LT |
856 | "ibm,get-xive returns %d\n", |
857 | virq, status); | |
858 | goto unlock; | |
859 | } | |
860 | ||
861 | /* | |
862 | * We only support delivery to all cpus or to one cpu. | |
863 | * The irq has to be migrated only in the single cpu | |
864 | * case. | |
865 | */ | |
866 | if (xics_status[0] != get_hard_smp_processor_id(cpu)) | |
867 | goto unlock; | |
868 | ||
26370322 | 869 | printk(KERN_WARNING "IRQ %u affinity broken off cpu %u\n", |
1da177e4 LT |
870 | virq, cpu); |
871 | ||
872 | /* Reset affinity to all cpus */ | |
d1bef4ed | 873 | desc->chip->set_affinity(virq, CPU_MASK_ALL); |
a53da52f | 874 | irq_desc[irq].affinity = CPU_MASK_ALL; |
1da177e4 LT |
875 | unlock: |
876 | spin_unlock_irqrestore(&desc->lock, flags); | |
877 | } | |
878 | } | |
879 | #endif |