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 | 11 | |
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/threads.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/irq.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/interrupt.h> | |
1da177e4 | 18 | #include <linux/init.h> |
1da177e4 LT |
19 | #include <linux/radix-tree.h> |
20 | #include <linux/cpu.h> | |
8435b027 | 21 | #include <linux/msi.h> |
188bdddd | 22 | #include <linux/of.h> |
49bd3647 | 23 | #include <linux/percpu.h> |
0ebfff14 | 24 | |
57cfb814 | 25 | #include <asm/firmware.h> |
1da177e4 LT |
26 | #include <asm/io.h> |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/smp.h> | |
29 | #include <asm/rtas.h> | |
1da177e4 LT |
30 | #include <asm/hvcall.h> |
31 | #include <asm/machdep.h> | |
1da177e4 | 32 | |
007e8f51 | 33 | #include "xics.h" |
b9377ffc | 34 | #include "plpar_wrappers.h" |
007e8f51 | 35 | |
0641cc91 MM |
36 | static struct irq_host *xics_host; |
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 | ||
49bd3647 MN |
50 | /* The least favored priority */ |
51 | #define LOWEST_PRIORITY 0xFF | |
52 | ||
53 | /* The number of priorities defined above */ | |
54 | #define MAX_NUM_PRIORITIES 3 | |
55 | ||
0641cc91 MM |
56 | static unsigned int default_server = 0xFF; |
57 | static unsigned int default_distrib_server = 0; | |
58 | static unsigned int interrupt_server_size = 8; | |
59 | ||
60 | /* RTAS service tokens */ | |
61 | static int ibm_get_xive; | |
62 | static int ibm_set_xive; | |
63 | static int ibm_int_on; | |
64 | static int ibm_int_off; | |
65 | ||
49bd3647 MN |
66 | struct xics_cppr { |
67 | unsigned char stack[MAX_NUM_PRIORITIES]; | |
68 | int index; | |
69 | }; | |
70 | ||
71 | static DEFINE_PER_CPU(struct xics_cppr, xics_cppr); | |
0641cc91 MM |
72 | |
73 | /* Direct hardware low level accessors */ | |
74 | ||
75 | /* The part of the interrupt presentation layer that we care about */ | |
1da177e4 LT |
76 | struct xics_ipl { |
77 | union { | |
78 | u32 word; | |
79 | u8 bytes[4]; | |
80 | } xirr_poll; | |
81 | union { | |
82 | u32 word; | |
83 | u8 bytes[4]; | |
84 | } xirr; | |
85 | u32 dummy; | |
86 | union { | |
87 | u32 word; | |
88 | u8 bytes[4]; | |
89 | } qirr; | |
90 | }; | |
91 | ||
92 | static struct xics_ipl __iomem *xics_per_cpu[NR_CPUS]; | |
93 | ||
d7cf0edb | 94 | static inline unsigned int direct_xirr_info_get(void) |
1da177e4 | 95 | { |
d7cf0edb MM |
96 | int cpu = smp_processor_id(); |
97 | ||
98 | return in_be32(&xics_per_cpu[cpu]->xirr.word); | |
1da177e4 LT |
99 | } |
100 | ||
9dc2d441 | 101 | static inline void direct_xirr_info_set(unsigned int value) |
1da177e4 | 102 | { |
d7cf0edb MM |
103 | int cpu = smp_processor_id(); |
104 | ||
105 | out_be32(&xics_per_cpu[cpu]->xirr.word, value); | |
1da177e4 LT |
106 | } |
107 | ||
d7cf0edb | 108 | static inline void direct_cppr_info(u8 value) |
1da177e4 | 109 | { |
d7cf0edb MM |
110 | int cpu = smp_processor_id(); |
111 | ||
112 | out_8(&xics_per_cpu[cpu]->xirr.bytes[0], value); | |
1da177e4 LT |
113 | } |
114 | ||
b9e5b4e6 | 115 | static inline void direct_qirr_info(int n_cpu, u8 value) |
1da177e4 LT |
116 | { |
117 | out_8(&xics_per_cpu[n_cpu]->qirr.bytes[0], value); | |
118 | } | |
119 | ||
1da177e4 | 120 | |
b9e5b4e6 | 121 | /* LPAR low level accessors */ |
1da177e4 | 122 | |
d7cf0edb | 123 | static inline unsigned int lpar_xirr_info_get(void) |
1da177e4 LT |
124 | { |
125 | unsigned long lpar_rc; | |
007e8f51 | 126 | unsigned long return_value; |
1da177e4 LT |
127 | |
128 | lpar_rc = plpar_xirr(&return_value); | |
706c8c93 | 129 | if (lpar_rc != H_SUCCESS) |
007e8f51 | 130 | panic(" bad return code xirr - rc = %lx \n", lpar_rc); |
0ebfff14 | 131 | return (unsigned int)return_value; |
1da177e4 LT |
132 | } |
133 | ||
9dc2d441 | 134 | static inline void lpar_xirr_info_set(unsigned int value) |
1da177e4 LT |
135 | { |
136 | unsigned long lpar_rc; | |
1da177e4 | 137 | |
9dc2d441 | 138 | lpar_rc = plpar_eoi(value); |
706c8c93 | 139 | if (lpar_rc != H_SUCCESS) |
9dc2d441 MM |
140 | panic("bad return code EOI - rc = %ld, value=%x\n", lpar_rc, |
141 | value); | |
1da177e4 LT |
142 | } |
143 | ||
d7cf0edb | 144 | static inline void lpar_cppr_info(u8 value) |
1da177e4 LT |
145 | { |
146 | unsigned long lpar_rc; | |
147 | ||
148 | lpar_rc = plpar_cppr(value); | |
706c8c93 | 149 | if (lpar_rc != H_SUCCESS) |
007e8f51 | 150 | panic("bad return code cppr - rc = %lx\n", lpar_rc); |
1da177e4 LT |
151 | } |
152 | ||
b9e5b4e6 | 153 | static inline void lpar_qirr_info(int n_cpu , u8 value) |
1da177e4 LT |
154 | { |
155 | unsigned long lpar_rc; | |
156 | ||
157 | lpar_rc = plpar_ipi(get_hard_smp_processor_id(n_cpu), value); | |
706c8c93 | 158 | if (lpar_rc != H_SUCCESS) |
007e8f51 | 159 | panic("bad return code qirr - rc = %lx\n", lpar_rc); |
1da177e4 LT |
160 | } |
161 | ||
1da177e4 | 162 | |
0641cc91 | 163 | /* Interface to generic irq subsystem */ |
1da177e4 LT |
164 | |
165 | #ifdef CONFIG_SMP | |
92cb3694 AB |
166 | static int get_irq_server(unsigned int virq, cpumask_t cpumask, |
167 | unsigned int strict_check) | |
1da177e4 | 168 | { |
7ccb4a66 | 169 | int server; |
1da177e4 | 170 | /* For the moment only implement delivery to all cpus or one cpu */ |
1da177e4 LT |
171 | cpumask_t tmp = CPU_MASK_NONE; |
172 | ||
173 | if (!distribute_irqs) | |
174 | return default_server; | |
175 | ||
7ccb4a66 | 176 | if (!cpus_equal(cpumask, CPU_MASK_ALL)) { |
1da177e4 LT |
177 | cpus_and(tmp, cpu_online_map, cpumask); |
178 | ||
7ccb4a66 MK |
179 | server = first_cpu(tmp); |
180 | ||
181 | if (server < NR_CPUS) | |
182 | return get_hard_smp_processor_id(server); | |
183 | ||
184 | if (strict_check) | |
185 | return -1; | |
1da177e4 LT |
186 | } |
187 | ||
7ccb4a66 MK |
188 | if (cpus_equal(cpu_online_map, cpu_present_map)) |
189 | return default_distrib_server; | |
1da177e4 | 190 | |
7ccb4a66 | 191 | return default_server; |
1da177e4 LT |
192 | } |
193 | #else | |
92cb3694 AB |
194 | static int get_irq_server(unsigned int virq, cpumask_t cpumask, |
195 | unsigned int strict_check) | |
1da177e4 LT |
196 | { |
197 | return default_server; | |
198 | } | |
199 | #endif | |
200 | ||
b9e5b4e6 | 201 | static void xics_unmask_irq(unsigned int virq) |
1da177e4 LT |
202 | { |
203 | unsigned int irq; | |
204 | int call_status; | |
7ccb4a66 | 205 | int server; |
1da177e4 | 206 | |
b69e9e93 | 207 | pr_devel("xics: unmask virq %d\n", virq); |
0ebfff14 BH |
208 | |
209 | irq = (unsigned int)irq_map[virq].hwirq; | |
b69e9e93 | 210 | pr_devel(" -> map to hwirq 0x%x\n", irq); |
0ebfff14 | 211 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) |
1da177e4 LT |
212 | return; |
213 | ||
92cb3694 | 214 | server = get_irq_server(virq, *(irq_to_desc(virq)->affinity), 0); |
b9e5b4e6 | 215 | |
1da177e4 LT |
216 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, |
217 | DEFAULT_PRIORITY); | |
218 | if (call_status != 0) { | |
2172fe87 MM |
219 | printk(KERN_ERR |
220 | "%s: ibm_set_xive irq %u server %x returned %d\n", | |
221 | __func__, irq, server, call_status); | |
1da177e4 LT |
222 | return; |
223 | } | |
224 | ||
225 | /* Now unmask the interrupt (often a no-op) */ | |
226 | call_status = rtas_call(ibm_int_on, 1, 1, NULL, irq); | |
227 | if (call_status != 0) { | |
2172fe87 MM |
228 | printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n", |
229 | __func__, irq, call_status); | |
1da177e4 LT |
230 | return; |
231 | } | |
232 | } | |
233 | ||
0641cc91 MM |
234 | static unsigned int xics_startup(unsigned int virq) |
235 | { | |
8435b027 AD |
236 | /* |
237 | * The generic MSI code returns with the interrupt disabled on the | |
238 | * card, using the MSI mask bits. Firmware doesn't appear to unmask | |
239 | * at that level, so we do it here by hand. | |
240 | */ | |
241 | if (irq_to_desc(virq)->msi_desc) | |
242 | unmask_msi_irq(virq); | |
243 | ||
0641cc91 MM |
244 | /* unmask it */ |
245 | xics_unmask_irq(virq); | |
246 | return 0; | |
247 | } | |
248 | ||
b9e5b4e6 | 249 | static void xics_mask_real_irq(unsigned int irq) |
1da177e4 LT |
250 | { |
251 | int call_status; | |
1da177e4 LT |
252 | |
253 | if (irq == XICS_IPI) | |
254 | return; | |
255 | ||
256 | call_status = rtas_call(ibm_int_off, 1, 1, NULL, irq); | |
257 | if (call_status != 0) { | |
2172fe87 MM |
258 | printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n", |
259 | __func__, irq, call_status); | |
1da177e4 LT |
260 | return; |
261 | } | |
262 | ||
1da177e4 | 263 | /* Have to set XIVE to 0xff to be able to remove a slot */ |
673aeb76 MO |
264 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, |
265 | default_server, 0xff); | |
1da177e4 | 266 | if (call_status != 0) { |
2172fe87 MM |
267 | printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n", |
268 | __func__, irq, call_status); | |
1da177e4 LT |
269 | return; |
270 | } | |
271 | } | |
272 | ||
b9e5b4e6 | 273 | static void xics_mask_irq(unsigned int virq) |
1da177e4 LT |
274 | { |
275 | unsigned int irq; | |
276 | ||
b69e9e93 | 277 | pr_devel("xics: mask virq %d\n", virq); |
0ebfff14 BH |
278 | |
279 | irq = (unsigned int)irq_map[virq].hwirq; | |
280 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) | |
281 | return; | |
282 | xics_mask_real_irq(irq); | |
b9e5b4e6 BH |
283 | } |
284 | ||
0641cc91 | 285 | static void xics_mask_unknown_vec(unsigned int vec) |
1da177e4 | 286 | { |
0641cc91 MM |
287 | printk(KERN_ERR "Interrupt %u (real) is invalid, disabling it.\n", vec); |
288 | xics_mask_real_irq(vec); | |
1da177e4 LT |
289 | } |
290 | ||
8767e9ba | 291 | static inline unsigned int xics_xirr_vector(unsigned int xirr) |
1da177e4 | 292 | { |
8767e9ba MM |
293 | /* |
294 | * The top byte is the old cppr, to be restored on EOI. | |
295 | * The remaining 24 bits are the vector. | |
296 | */ | |
297 | return xirr & 0x00ffffff; | |
298 | } | |
299 | ||
49bd3647 MN |
300 | static void push_cppr(unsigned int vec) |
301 | { | |
302 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); | |
303 | ||
304 | if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1)) | |
305 | return; | |
306 | ||
307 | if (vec == XICS_IPI) | |
308 | os_cppr->stack[++os_cppr->index] = IPI_PRIORITY; | |
309 | else | |
310 | os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY; | |
311 | } | |
312 | ||
8767e9ba MM |
313 | static unsigned int xics_get_irq_direct(void) |
314 | { | |
315 | unsigned int xirr = direct_xirr_info_get(); | |
316 | unsigned int vec = xics_xirr_vector(xirr); | |
317 | unsigned int irq; | |
1da177e4 | 318 | |
b9e5b4e6 BH |
319 | if (vec == XICS_IRQ_SPURIOUS) |
320 | return NO_IRQ; | |
8767e9ba | 321 | |
967e012e | 322 | irq = irq_radix_revmap_lookup(xics_host, vec); |
49bd3647 MN |
323 | if (likely(irq != NO_IRQ)) { |
324 | push_cppr(vec); | |
0ebfff14 | 325 | return irq; |
49bd3647 | 326 | } |
b9e5b4e6 | 327 | |
8767e9ba MM |
328 | /* We don't have a linux mapping, so have rtas mask it. */ |
329 | xics_mask_unknown_vec(vec); | |
1da177e4 | 330 | |
8767e9ba MM |
331 | /* We might learn about it later, so EOI it */ |
332 | direct_xirr_info_set(xirr); | |
333 | return NO_IRQ; | |
b9e5b4e6 BH |
334 | } |
335 | ||
35a84c2f | 336 | static unsigned int xics_get_irq_lpar(void) |
1da177e4 | 337 | { |
8767e9ba MM |
338 | unsigned int xirr = lpar_xirr_info_get(); |
339 | unsigned int vec = xics_xirr_vector(xirr); | |
340 | unsigned int irq; | |
341 | ||
342 | if (vec == XICS_IRQ_SPURIOUS) | |
343 | return NO_IRQ; | |
344 | ||
345 | irq = irq_radix_revmap_lookup(xics_host, vec); | |
49bd3647 MN |
346 | if (likely(irq != NO_IRQ)) { |
347 | push_cppr(vec); | |
8767e9ba | 348 | return irq; |
49bd3647 | 349 | } |
8767e9ba MM |
350 | |
351 | /* We don't have a linux mapping, so have RTAS mask it. */ | |
352 | xics_mask_unknown_vec(vec); | |
353 | ||
354 | /* We might learn about it later, so EOI it */ | |
355 | lpar_xirr_info_set(xirr); | |
356 | return NO_IRQ; | |
b9e5b4e6 BH |
357 | } |
358 | ||
49bd3647 MN |
359 | static unsigned char pop_cppr(void) |
360 | { | |
361 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); | |
362 | ||
363 | if (WARN_ON(os_cppr->index < 1)) | |
364 | return LOWEST_PRIORITY; | |
365 | ||
366 | return os_cppr->stack[--os_cppr->index]; | |
367 | } | |
368 | ||
0641cc91 | 369 | static void xics_eoi_direct(unsigned int virq) |
b9e5b4e6 | 370 | { |
0641cc91 | 371 | unsigned int irq = (unsigned int)irq_map[virq].hwirq; |
b9e5b4e6 | 372 | |
0641cc91 | 373 | iosync(); |
49bd3647 | 374 | direct_xirr_info_set((pop_cppr() << 24) | irq); |
b9e5b4e6 BH |
375 | } |
376 | ||
0641cc91 | 377 | static void xics_eoi_lpar(unsigned int virq) |
b9e5b4e6 | 378 | { |
0641cc91 | 379 | unsigned int irq = (unsigned int)irq_map[virq].hwirq; |
1da177e4 | 380 | |
b9e5b4e6 | 381 | iosync(); |
49bd3647 | 382 | lpar_xirr_info_set((pop_cppr() << 24) | irq); |
b9e5b4e6 BH |
383 | } |
384 | ||
d5dedd45 | 385 | static int xics_set_affinity(unsigned int virq, const struct cpumask *cpumask) |
b9e5b4e6 BH |
386 | { |
387 | unsigned int irq; | |
388 | int status; | |
389 | int xics_status[2]; | |
7ccb4a66 | 390 | int irq_server; |
b9e5b4e6 | 391 | |
0ebfff14 BH |
392 | irq = (unsigned int)irq_map[virq].hwirq; |
393 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) | |
d5dedd45 | 394 | return -1; |
b9e5b4e6 BH |
395 | |
396 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); | |
397 | ||
398 | if (status) { | |
2172fe87 MM |
399 | printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n", |
400 | __func__, irq, status); | |
d5dedd45 | 401 | return -1; |
b9e5b4e6 BH |
402 | } |
403 | ||
7ccb4a66 MK |
404 | /* |
405 | * For the moment only implement delivery to all cpus or one cpu. | |
406 | * Get current irq_server for the given irq | |
407 | */ | |
92cb3694 | 408 | irq_server = get_irq_server(virq, *cpumask, 1); |
7ccb4a66 MK |
409 | if (irq_server == -1) { |
410 | char cpulist[128]; | |
411 | cpumask_scnprintf(cpulist, sizeof(cpulist), cpumask); | |
2172fe87 MM |
412 | printk(KERN_WARNING |
413 | "%s: No online cpus in the mask %s for irq %d\n", | |
414 | __func__, cpulist, virq); | |
d5dedd45 | 415 | return -1; |
b9e5b4e6 BH |
416 | } |
417 | ||
418 | status = rtas_call(ibm_set_xive, 3, 1, NULL, | |
7ccb4a66 | 419 | irq, irq_server, xics_status[1]); |
b9e5b4e6 BH |
420 | |
421 | if (status) { | |
2172fe87 MM |
422 | printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n", |
423 | __func__, irq, status); | |
d5dedd45 | 424 | return -1; |
b9e5b4e6 | 425 | } |
d5dedd45 YL |
426 | |
427 | return 0; | |
b9e5b4e6 BH |
428 | } |
429 | ||
430 | static struct irq_chip xics_pic_direct = { | |
b27df672 | 431 | .name = " XICS ", |
b9e5b4e6 BH |
432 | .startup = xics_startup, |
433 | .mask = xics_mask_irq, | |
434 | .unmask = xics_unmask_irq, | |
435 | .eoi = xics_eoi_direct, | |
436 | .set_affinity = xics_set_affinity | |
437 | }; | |
438 | ||
b9e5b4e6 | 439 | static struct irq_chip xics_pic_lpar = { |
b27df672 | 440 | .name = " XICS ", |
b9e5b4e6 BH |
441 | .startup = xics_startup, |
442 | .mask = xics_mask_irq, | |
443 | .unmask = xics_unmask_irq, | |
444 | .eoi = xics_eoi_lpar, | |
445 | .set_affinity = xics_set_affinity | |
446 | }; | |
447 | ||
0641cc91 MM |
448 | |
449 | /* Interface to arch irq controller subsystem layer */ | |
450 | ||
1af9fa89 ME |
451 | /* Points to the irq_chip we're actually using */ |
452 | static struct irq_chip *xics_irq_chip; | |
b9e5b4e6 | 453 | |
0ebfff14 | 454 | static int xics_host_match(struct irq_host *h, struct device_node *node) |
1da177e4 | 455 | { |
0ebfff14 BH |
456 | /* IBM machines have interrupt parents of various funky types for things |
457 | * like vdevices, events, etc... The trick we use here is to match | |
458 | * everything here except the legacy 8259 which is compatible "chrp,iic" | |
459 | */ | |
55b61fec | 460 | return !of_device_is_compatible(node, "chrp,iic"); |
0ebfff14 | 461 | } |
1da177e4 | 462 | |
1af9fa89 ME |
463 | static int xics_host_map(struct irq_host *h, unsigned int virq, |
464 | irq_hw_number_t hw) | |
0ebfff14 | 465 | { |
b69e9e93 | 466 | pr_devel("xics: map virq %d, hwirq 0x%lx\n", virq, hw); |
0ebfff14 | 467 | |
967e012e SD |
468 | /* Insert the interrupt mapping into the radix tree for fast lookup */ |
469 | irq_radix_revmap_insert(xics_host, virq, hw); | |
470 | ||
6cff46f4 | 471 | irq_to_desc(virq)->status |= IRQ_LEVEL; |
1af9fa89 | 472 | set_irq_chip_and_handler(virq, xics_irq_chip, handle_fasteoi_irq); |
0ebfff14 BH |
473 | return 0; |
474 | } | |
475 | ||
476 | static int xics_host_xlate(struct irq_host *h, struct device_node *ct, | |
40d50cf7 | 477 | const u32 *intspec, unsigned int intsize, |
0ebfff14 BH |
478 | irq_hw_number_t *out_hwirq, unsigned int *out_flags) |
479 | ||
480 | { | |
481 | /* Current xics implementation translates everything | |
482 | * to level. It is not technically right for MSIs but this | |
483 | * is irrelevant at this point. We might get smarter in the future | |
6c80a21c | 484 | */ |
0ebfff14 BH |
485 | *out_hwirq = intspec[0]; |
486 | *out_flags = IRQ_TYPE_LEVEL_LOW; | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
1af9fa89 | 491 | static struct irq_host_ops xics_host_ops = { |
0ebfff14 | 492 | .match = xics_host_match, |
1af9fa89 | 493 | .map = xics_host_map, |
0ebfff14 BH |
494 | .xlate = xics_host_xlate, |
495 | }; | |
496 | ||
497 | static void __init xics_init_host(void) | |
498 | { | |
0ebfff14 | 499 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
1af9fa89 | 500 | xics_irq_chip = &xics_pic_lpar; |
0ebfff14 | 501 | else |
1af9fa89 ME |
502 | xics_irq_chip = &xics_pic_direct; |
503 | ||
504 | xics_host = irq_alloc_host(NULL, IRQ_HOST_MAP_TREE, 0, &xics_host_ops, | |
0ebfff14 BH |
505 | XICS_IRQ_SPURIOUS); |
506 | BUG_ON(xics_host == NULL); | |
507 | irq_set_default_host(xics_host); | |
6c80a21c | 508 | } |
1da177e4 | 509 | |
0641cc91 MM |
510 | |
511 | /* Inter-processor interrupt support */ | |
512 | ||
513 | #ifdef CONFIG_SMP | |
514 | /* | |
515 | * XICS only has a single IPI, so encode the messages per CPU | |
516 | */ | |
517 | struct xics_ipi_struct { | |
518 | unsigned long value; | |
519 | } ____cacheline_aligned; | |
520 | ||
521 | static struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned; | |
522 | ||
523 | static inline void smp_xics_do_message(int cpu, int msg) | |
524 | { | |
525 | set_bit(msg, &xics_ipi_message[cpu].value); | |
526 | mb(); | |
527 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
528 | lpar_qirr_info(cpu, IPI_PRIORITY); | |
529 | else | |
530 | direct_qirr_info(cpu, IPI_PRIORITY); | |
531 | } | |
532 | ||
533 | void smp_xics_message_pass(int target, int msg) | |
534 | { | |
535 | unsigned int i; | |
536 | ||
537 | if (target < NR_CPUS) { | |
538 | smp_xics_do_message(target, msg); | |
539 | } else { | |
540 | for_each_online_cpu(i) { | |
541 | if (target == MSG_ALL_BUT_SELF | |
542 | && i == smp_processor_id()) | |
543 | continue; | |
544 | smp_xics_do_message(i, msg); | |
545 | } | |
546 | } | |
547 | } | |
548 | ||
549 | static irqreturn_t xics_ipi_dispatch(int cpu) | |
550 | { | |
551 | WARN_ON(cpu_is_offline(cpu)); | |
552 | ||
199f45c4 | 553 | mb(); /* order mmio clearing qirr */ |
0641cc91 MM |
554 | while (xics_ipi_message[cpu].value) { |
555 | if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, | |
556 | &xics_ipi_message[cpu].value)) { | |
0641cc91 MM |
557 | smp_message_recv(PPC_MSG_CALL_FUNCTION); |
558 | } | |
559 | if (test_and_clear_bit(PPC_MSG_RESCHEDULE, | |
560 | &xics_ipi_message[cpu].value)) { | |
0641cc91 MM |
561 | smp_message_recv(PPC_MSG_RESCHEDULE); |
562 | } | |
563 | if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE, | |
564 | &xics_ipi_message[cpu].value)) { | |
0641cc91 MM |
565 | smp_message_recv(PPC_MSG_CALL_FUNC_SINGLE); |
566 | } | |
567 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) | |
568 | if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, | |
569 | &xics_ipi_message[cpu].value)) { | |
0641cc91 MM |
570 | smp_message_recv(PPC_MSG_DEBUGGER_BREAK); |
571 | } | |
572 | #endif | |
573 | } | |
574 | return IRQ_HANDLED; | |
575 | } | |
576 | ||
577 | static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id) | |
578 | { | |
579 | int cpu = smp_processor_id(); | |
580 | ||
581 | direct_qirr_info(cpu, 0xff); | |
582 | ||
583 | return xics_ipi_dispatch(cpu); | |
584 | } | |
585 | ||
586 | static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id) | |
587 | { | |
588 | int cpu = smp_processor_id(); | |
589 | ||
590 | lpar_qirr_info(cpu, 0xff); | |
591 | ||
592 | return xics_ipi_dispatch(cpu); | |
593 | } | |
594 | ||
595 | static void xics_request_ipi(void) | |
596 | { | |
597 | unsigned int ipi; | |
598 | int rc; | |
599 | ||
600 | ipi = irq_create_mapping(xics_host, XICS_IPI); | |
601 | BUG_ON(ipi == NO_IRQ); | |
602 | ||
603 | /* | |
604 | * IPIs are marked IRQF_DISABLED as they must run with irqs | |
605 | * disabled | |
606 | */ | |
607 | set_irq_handler(ipi, handle_percpu_irq); | |
608 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
d879f384 MM |
609 | rc = request_irq(ipi, xics_ipi_action_lpar, |
610 | IRQF_DISABLED|IRQF_PERCPU, "IPI", NULL); | |
0641cc91 | 611 | else |
d879f384 MM |
612 | rc = request_irq(ipi, xics_ipi_action_direct, |
613 | IRQF_DISABLED|IRQF_PERCPU, "IPI", NULL); | |
0641cc91 MM |
614 | BUG_ON(rc); |
615 | } | |
616 | ||
617 | int __init smp_xics_probe(void) | |
618 | { | |
619 | xics_request_ipi(); | |
620 | ||
621 | return cpus_weight(cpu_possible_map); | |
622 | } | |
623 | ||
624 | #endif /* CONFIG_SMP */ | |
625 | ||
626 | ||
627 | /* Initialization */ | |
628 | ||
629 | static void xics_update_irq_servers(void) | |
630 | { | |
631 | int i, j; | |
632 | struct device_node *np; | |
633 | u32 ilen; | |
1ef8014d | 634 | const u32 *ireg; |
0641cc91 MM |
635 | u32 hcpuid; |
636 | ||
637 | /* Find the server numbers for the boot cpu. */ | |
638 | np = of_get_cpu_node(boot_cpuid, NULL); | |
639 | BUG_ON(!np); | |
640 | ||
641 | ireg = of_get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen); | |
642 | if (!ireg) { | |
643 | of_node_put(np); | |
644 | return; | |
645 | } | |
646 | ||
647 | i = ilen / sizeof(int); | |
648 | hcpuid = get_hard_smp_processor_id(boot_cpuid); | |
649 | ||
650 | /* Global interrupt distribution server is specified in the last | |
651 | * entry of "ibm,ppc-interrupt-gserver#s" property. Get the last | |
652 | * entry fom this property for current boot cpu id and use it as | |
653 | * default distribution server | |
654 | */ | |
655 | for (j = 0; j < i; j += 2) { | |
656 | if (ireg[j] == hcpuid) { | |
657 | default_server = hcpuid; | |
658 | default_distrib_server = ireg[j+1]; | |
0641cc91 MM |
659 | } |
660 | } | |
661 | ||
662 | of_node_put(np); | |
663 | } | |
664 | ||
0ebfff14 BH |
665 | static void __init xics_map_one_cpu(int hw_id, unsigned long addr, |
666 | unsigned long size) | |
1da177e4 LT |
667 | { |
668 | int i; | |
1da177e4 | 669 | |
0ebfff14 BH |
670 | /* This may look gross but it's good enough for now, we don't quite |
671 | * have a hard -> linux processor id matching. | |
672 | */ | |
673 | for_each_possible_cpu(i) { | |
674 | if (!cpu_present(i)) | |
675 | continue; | |
676 | if (hw_id == get_hard_smp_processor_id(i)) { | |
677 | xics_per_cpu[i] = ioremap(addr, size); | |
678 | return; | |
679 | } | |
680 | } | |
0ebfff14 | 681 | } |
1da177e4 | 682 | |
0ebfff14 BH |
683 | static void __init xics_init_one_node(struct device_node *np, |
684 | unsigned int *indx) | |
685 | { | |
686 | unsigned int ilen; | |
954a46e2 | 687 | const u32 *ireg; |
1da177e4 | 688 | |
0ebfff14 BH |
689 | /* This code does the theorically broken assumption that the interrupt |
690 | * server numbers are the same as the hard CPU numbers. | |
691 | * This happens to be the case so far but we are playing with fire... | |
692 | * should be fixed one of these days. -BenH. | |
693 | */ | |
e2eb6392 | 694 | ireg = of_get_property(np, "ibm,interrupt-server-ranges", NULL); |
1da177e4 | 695 | |
0ebfff14 BH |
696 | /* Do that ever happen ? we'll know soon enough... but even good'old |
697 | * f80 does have that property .. | |
698 | */ | |
699 | WARN_ON(ireg == NULL); | |
1da177e4 LT |
700 | if (ireg) { |
701 | /* | |
702 | * set node starting index for this node | |
703 | */ | |
0ebfff14 | 704 | *indx = *ireg; |
1da177e4 | 705 | } |
e2eb6392 | 706 | ireg = of_get_property(np, "reg", &ilen); |
1da177e4 LT |
707 | if (!ireg) |
708 | panic("xics_init_IRQ: can't find interrupt reg property"); | |
007e8f51 | 709 | |
0ebfff14 BH |
710 | while (ilen >= (4 * sizeof(u32))) { |
711 | unsigned long addr, size; | |
712 | ||
713 | /* XXX Use proper OF parsing code here !!! */ | |
714 | addr = (unsigned long)*ireg++ << 32; | |
715 | ilen -= sizeof(u32); | |
716 | addr |= *ireg++; | |
717 | ilen -= sizeof(u32); | |
718 | size = (unsigned long)*ireg++ << 32; | |
719 | ilen -= sizeof(u32); | |
720 | size |= *ireg++; | |
721 | ilen -= sizeof(u32); | |
722 | xics_map_one_cpu(*indx, addr, size); | |
723 | (*indx)++; | |
724 | } | |
725 | } | |
726 | ||
0ebfff14 BH |
727 | void __init xics_init_IRQ(void) |
728 | { | |
0ebfff14 | 729 | struct device_node *np; |
de0723dc | 730 | u32 indx = 0; |
0ebfff14 | 731 | int found = 0; |
1ef8014d | 732 | const u32 *isize; |
0ebfff14 BH |
733 | |
734 | ppc64_boot_msg(0x20, "XICS Init"); | |
735 | ||
736 | ibm_get_xive = rtas_token("ibm,get-xive"); | |
737 | ibm_set_xive = rtas_token("ibm,set-xive"); | |
738 | ibm_int_on = rtas_token("ibm,int-on"); | |
739 | ibm_int_off = rtas_token("ibm,int-off"); | |
740 | ||
741 | for_each_node_by_type(np, "PowerPC-External-Interrupt-Presentation") { | |
742 | found = 1; | |
a244a957 MM |
743 | if (firmware_has_feature(FW_FEATURE_LPAR)) { |
744 | of_node_put(np); | |
0ebfff14 | 745 | break; |
a244a957 | 746 | } |
0ebfff14 BH |
747 | xics_init_one_node(np, &indx); |
748 | } | |
749 | if (found == 0) | |
750 | return; | |
751 | ||
1ef8014d SD |
752 | /* get the bit size of server numbers */ |
753 | found = 0; | |
754 | ||
755 | for_each_compatible_node(np, NULL, "ibm,ppc-xics") { | |
756 | isize = of_get_property(np, "ibm,interrupt-server#-size", NULL); | |
757 | ||
758 | if (!isize) | |
759 | continue; | |
760 | ||
761 | if (!found) { | |
762 | interrupt_server_size = *isize; | |
763 | found = 1; | |
764 | } else if (*isize != interrupt_server_size) { | |
765 | printk(KERN_WARNING "XICS: " | |
766 | "mismatched ibm,interrupt-server#-size\n"); | |
767 | interrupt_server_size = max(*isize, | |
768 | interrupt_server_size); | |
769 | } | |
770 | } | |
771 | ||
de0723dc | 772 | xics_update_irq_servers(); |
302905a3 | 773 | xics_init_host(); |
1da177e4 | 774 | |
0ebfff14 BH |
775 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
776 | ppc_md.get_irq = xics_get_irq_lpar; | |
777 | else | |
b9e5b4e6 | 778 | ppc_md.get_irq = xics_get_irq_direct; |
1da177e4 | 779 | |
6c80a21c | 780 | xics_setup_cpu(); |
1da177e4 | 781 | |
0ebfff14 | 782 | ppc64_boot_msg(0x21, "XICS Done"); |
1da177e4 | 783 | } |
b9e5b4e6 | 784 | |
0641cc91 | 785 | /* Cpu startup, shutdown, and hotplug */ |
1da177e4 | 786 | |
0641cc91 | 787 | static void xics_set_cpu_priority(unsigned char cppr) |
1da177e4 | 788 | { |
49bd3647 MN |
789 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); |
790 | ||
791 | BUG_ON(os_cppr->index != 0); | |
792 | ||
793 | os_cppr->stack[os_cppr->index] = cppr; | |
794 | ||
b9e5b4e6 | 795 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
0641cc91 | 796 | lpar_cppr_info(cppr); |
b9e5b4e6 | 797 | else |
0641cc91 MM |
798 | direct_cppr_info(cppr); |
799 | iosync(); | |
1da177e4 | 800 | } |
d13f7208 | 801 | |
b4963255 MM |
802 | /* Have the calling processor join or leave the specified global queue */ |
803 | static void xics_set_cpu_giq(unsigned int gserver, unsigned int join) | |
804 | { | |
edc72ac4 NL |
805 | int index; |
806 | int status; | |
807 | ||
808 | if (!rtas_indicator_present(GLOBAL_INTERRUPT_QUEUE, NULL)) | |
809 | return; | |
810 | ||
811 | index = (1UL << interrupt_server_size) - 1 - gserver; | |
812 | ||
813 | status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, index, join); | |
814 | ||
815 | WARN(status < 0, "set-indicator(%d, %d, %u) returned %d\n", | |
816 | GLOBAL_INTERRUPT_QUEUE, index, join, status); | |
b4963255 | 817 | } |
0641cc91 MM |
818 | |
819 | void xics_setup_cpu(void) | |
d13f7208 | 820 | { |
49bd3647 | 821 | xics_set_cpu_priority(LOWEST_PRIORITY); |
d13f7208 | 822 | |
b4963255 | 823 | xics_set_cpu_giq(default_distrib_server, 1); |
d13f7208 MM |
824 | } |
825 | ||
f10095c3 | 826 | void xics_teardown_cpu(void) |
fce0d574 S |
827 | { |
828 | int cpu = smp_processor_id(); | |
fce0d574 | 829 | |
d7cf0edb | 830 | xics_set_cpu_priority(0); |
81bbbe92 | 831 | |
b4963255 | 832 | /* Clear any pending IPI request */ |
6e99e458 BH |
833 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
834 | lpar_qirr_info(cpu, 0xff); | |
835 | else | |
836 | direct_qirr_info(cpu, 0xff); | |
c3e8506c NF |
837 | } |
838 | ||
839 | void xics_kexec_teardown_cpu(int secondary) | |
840 | { | |
c3e8506c | 841 | xics_teardown_cpu(); |
6e99e458 | 842 | |
81bbbe92 | 843 | /* |
1a57c926 MM |
844 | * we take the ipi irq but and never return so we |
845 | * need to EOI the IPI, but want to leave our priority 0 | |
81bbbe92 | 846 | * |
1a57c926 | 847 | * should we check all the other interrupts too? |
81bbbe92 HM |
848 | * should we be flagging idle loop instead? |
849 | * or creating some task to be scheduled? | |
850 | */ | |
0ebfff14 | 851 | |
1a57c926 MM |
852 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
853 | lpar_xirr_info_set((0x00 << 24) | XICS_IPI); | |
854 | else | |
855 | direct_xirr_info_set((0x00 << 24) | XICS_IPI); | |
81bbbe92 | 856 | |
fce0d574 | 857 | /* |
6d22d85a PM |
858 | * Some machines need to have at least one cpu in the GIQ, |
859 | * so leave the master cpu in the group. | |
fce0d574 | 860 | */ |
81bbbe92 | 861 | if (secondary) |
b4963255 | 862 | xics_set_cpu_giq(default_distrib_server, 0); |
fce0d574 S |
863 | } |
864 | ||
1da177e4 LT |
865 | #ifdef CONFIG_HOTPLUG_CPU |
866 | ||
867 | /* Interrupts are disabled. */ | |
868 | void xics_migrate_irqs_away(void) | |
869 | { | |
d7cf0edb MM |
870 | int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id(); |
871 | unsigned int irq, virq; | |
1da177e4 | 872 | |
302905a3 MM |
873 | /* If we used to be the default server, move to the new "boot_cpuid" */ |
874 | if (hw_cpu == default_server) | |
875 | xics_update_irq_servers(); | |
876 | ||
1da177e4 | 877 | /* Reject any interrupt that was queued to us... */ |
d7cf0edb | 878 | xics_set_cpu_priority(0); |
1da177e4 | 879 | |
b4963255 MM |
880 | /* Remove ourselves from the global interrupt queue */ |
881 | xics_set_cpu_giq(default_distrib_server, 0); | |
1da177e4 LT |
882 | |
883 | /* Allow IPIs again... */ | |
d7cf0edb | 884 | xics_set_cpu_priority(DEFAULT_PRIORITY); |
1da177e4 LT |
885 | |
886 | for_each_irq(virq) { | |
b9e5b4e6 | 887 | struct irq_desc *desc; |
1da177e4 | 888 | int xics_status[2]; |
b4963255 | 889 | int status; |
1da177e4 LT |
890 | unsigned long flags; |
891 | ||
892 | /* We cant set affinity on ISA interrupts */ | |
0ebfff14 | 893 | if (virq < NUM_ISA_INTERRUPTS) |
1da177e4 | 894 | continue; |
0ebfff14 BH |
895 | if (irq_map[virq].host != xics_host) |
896 | continue; | |
897 | irq = (unsigned int)irq_map[virq].hwirq; | |
1da177e4 | 898 | /* We need to get IPIs still. */ |
0ebfff14 | 899 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) |
1da177e4 | 900 | continue; |
6cff46f4 | 901 | desc = irq_to_desc(virq); |
1da177e4 LT |
902 | |
903 | /* We only need to migrate enabled IRQS */ | |
d1bef4ed | 904 | if (desc == NULL || desc->chip == NULL |
1da177e4 | 905 | || desc->action == NULL |
d1bef4ed | 906 | || desc->chip->set_affinity == NULL) |
1da177e4 LT |
907 | continue; |
908 | ||
239007b8 | 909 | raw_spin_lock_irqsave(&desc->lock, flags); |
1da177e4 LT |
910 | |
911 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); | |
912 | if (status) { | |
2172fe87 MM |
913 | printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n", |
914 | __func__, irq, status); | |
1da177e4 LT |
915 | goto unlock; |
916 | } | |
917 | ||
918 | /* | |
919 | * We only support delivery to all cpus or to one cpu. | |
920 | * The irq has to be migrated only in the single cpu | |
921 | * case. | |
922 | */ | |
d7cf0edb | 923 | if (xics_status[0] != hw_cpu) |
1da177e4 LT |
924 | goto unlock; |
925 | ||
26370322 | 926 | printk(KERN_WARNING "IRQ %u affinity broken off cpu %u\n", |
1da177e4 LT |
927 | virq, cpu); |
928 | ||
929 | /* Reset affinity to all cpus */ | |
6cff46f4 | 930 | cpumask_setall(irq_to_desc(virq)->affinity); |
0de26520 | 931 | desc->chip->set_affinity(virq, cpu_all_mask); |
1da177e4 | 932 | unlock: |
239007b8 | 933 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
1da177e4 LT |
934 | } |
935 | } | |
936 | #endif |