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[linux-2.6/next.git] / arch / ia64 / sn / kernel / irq.c
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1 /*
2 * Platform dependent support for SGI SN
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
8 * Copyright (c) 2000-2008 Silicon Graphics, Inc. All Rights Reserved.
9 */
11 #include <linux/irq.h>
12 #include <linux/spinlock.h>
13 #include <linux/init.h>
14 #include <linux/rculist.h>
15 #include <linux/slab.h>
16 #include <asm/sn/addrs.h>
17 #include <asm/sn/arch.h>
18 #include <asm/sn/intr.h>
19 #include <asm/sn/pcibr_provider.h>
20 #include <asm/sn/pcibus_provider_defs.h>
21 #include <asm/sn/pcidev.h>
22 #include <asm/sn/shub_mmr.h>
23 #include <asm/sn/sn_sal.h>
24 #include <asm/sn/sn_feature_sets.h>
26 static void register_intr_pda(struct sn_irq_info *sn_irq_info);
27 static void unregister_intr_pda(struct sn_irq_info *sn_irq_info);
29 extern int sn_ioif_inited;
30 struct list_head **sn_irq_lh;
31 static DEFINE_SPINLOCK(sn_irq_info_lock); /* non-IRQ lock */
33 u64 sn_intr_alloc(nasid_t local_nasid, int local_widget,
34 struct sn_irq_info *sn_irq_info,
35 int req_irq, nasid_t req_nasid,
36 int req_slice)
38 struct ia64_sal_retval ret_stuff;
39 ret_stuff.status = 0;
40 ret_stuff.v0 = 0;
42 SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
43 (u64) SAL_INTR_ALLOC, (u64) local_nasid,
44 (u64) local_widget, __pa(sn_irq_info), (u64) req_irq,
45 (u64) req_nasid, (u64) req_slice);
47 return ret_stuff.status;
50 void sn_intr_free(nasid_t local_nasid, int local_widget,
51 struct sn_irq_info *sn_irq_info)
53 struct ia64_sal_retval ret_stuff;
54 ret_stuff.status = 0;
55 ret_stuff.v0 = 0;
57 SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
58 (u64) SAL_INTR_FREE, (u64) local_nasid,
59 (u64) local_widget, (u64) sn_irq_info->irq_irq,
60 (u64) sn_irq_info->irq_cookie, 0, 0);
63 u64 sn_intr_redirect(nasid_t local_nasid, int local_widget,
64 struct sn_irq_info *sn_irq_info,
65 nasid_t req_nasid, int req_slice)
67 struct ia64_sal_retval ret_stuff;
68 ret_stuff.status = 0;
69 ret_stuff.v0 = 0;
71 SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_INTERRUPT,
72 (u64) SAL_INTR_REDIRECT, (u64) local_nasid,
73 (u64) local_widget, __pa(sn_irq_info),
74 (u64) req_nasid, (u64) req_slice, 0);
76 return ret_stuff.status;
79 static unsigned int sn_startup_irq(struct irq_data *data)
81 return 0;
84 static void sn_shutdown_irq(struct irq_data *data)
88 extern void ia64_mca_register_cpev(int);
90 static void sn_disable_irq(struct irq_data *data)
92 if (data->irq == local_vector_to_irq(IA64_CPE_VECTOR))
93 ia64_mca_register_cpev(0);
96 static void sn_enable_irq(struct irq_data *data)
98 if (data->irq == local_vector_to_irq(IA64_CPE_VECTOR))
99 ia64_mca_register_cpev(data->irq);
102 static void sn_ack_irq(struct irq_data *data)
104 u64 event_occurred, mask;
105 unsigned int irq = data->irq & 0xff;
107 event_occurred = HUB_L((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED));
108 mask = event_occurred & SH_ALL_INT_MASK;
109 HUB_S((u64*)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS), mask);
110 __set_bit(irq, (volatile void *)pda->sn_in_service_ivecs);
112 irq_move_irq(data);
115 static void sn_irq_info_free(struct rcu_head *head);
117 struct sn_irq_info *sn_retarget_vector(struct sn_irq_info *sn_irq_info,
118 nasid_t nasid, int slice)
120 int vector;
121 int cpuid;
122 #ifdef CONFIG_SMP
123 int cpuphys;
124 #endif
125 int64_t bridge;
126 int local_widget, status;
127 nasid_t local_nasid;
128 struct sn_irq_info *new_irq_info;
129 struct sn_pcibus_provider *pci_provider;
131 bridge = (u64) sn_irq_info->irq_bridge;
132 if (!bridge) {
133 return NULL; /* irq is not a device interrupt */
136 local_nasid = NASID_GET(bridge);
138 if (local_nasid & 1)
139 local_widget = TIO_SWIN_WIDGETNUM(bridge);
140 else
141 local_widget = SWIN_WIDGETNUM(bridge);
142 vector = sn_irq_info->irq_irq;
144 /* Make use of SAL_INTR_REDIRECT if PROM supports it */
145 status = sn_intr_redirect(local_nasid, local_widget, sn_irq_info, nasid, slice);
146 if (!status) {
147 new_irq_info = sn_irq_info;
148 goto finish_up;
152 * PROM does not support SAL_INTR_REDIRECT, or it failed.
153 * Revert to old method.
155 new_irq_info = kmalloc(sizeof(struct sn_irq_info), GFP_ATOMIC);
156 if (new_irq_info == NULL)
157 return NULL;
159 memcpy(new_irq_info, sn_irq_info, sizeof(struct sn_irq_info));
161 /* Free the old PROM new_irq_info structure */
162 sn_intr_free(local_nasid, local_widget, new_irq_info);
163 unregister_intr_pda(new_irq_info);
165 /* allocate a new PROM new_irq_info struct */
166 status = sn_intr_alloc(local_nasid, local_widget,
167 new_irq_info, vector,
168 nasid, slice);
170 /* SAL call failed */
171 if (status) {
172 kfree(new_irq_info);
173 return NULL;
176 register_intr_pda(new_irq_info);
177 spin_lock(&sn_irq_info_lock);
178 list_replace_rcu(&sn_irq_info->list, &new_irq_info->list);
179 spin_unlock(&sn_irq_info_lock);
180 call_rcu(&sn_irq_info->rcu, sn_irq_info_free);
183 finish_up:
184 /* Update kernels new_irq_info with new target info */
185 cpuid = nasid_slice_to_cpuid(new_irq_info->irq_nasid,
186 new_irq_info->irq_slice);
187 new_irq_info->irq_cpuid = cpuid;
189 pci_provider = sn_pci_provider[new_irq_info->irq_bridge_type];
192 * If this represents a line interrupt, target it. If it's
193 * an msi (irq_int_bit < 0), it's already targeted.
195 if (new_irq_info->irq_int_bit >= 0 &&
196 pci_provider && pci_provider->target_interrupt)
197 (pci_provider->target_interrupt)(new_irq_info);
199 #ifdef CONFIG_SMP
200 cpuphys = cpu_physical_id(cpuid);
201 set_irq_affinity_info((vector & 0xff), cpuphys, 0);
202 #endif
204 return new_irq_info;
207 static int sn_set_affinity_irq(struct irq_data *data,
208 const struct cpumask *mask, bool force)
210 struct sn_irq_info *sn_irq_info, *sn_irq_info_safe;
211 unsigned int irq = data->irq;
212 nasid_t nasid;
213 int slice;
215 nasid = cpuid_to_nasid(cpumask_first(mask));
216 slice = cpuid_to_slice(cpumask_first(mask));
218 list_for_each_entry_safe(sn_irq_info, sn_irq_info_safe,
219 sn_irq_lh[irq], list)
220 (void)sn_retarget_vector(sn_irq_info, nasid, slice);
222 return 0;
225 #ifdef CONFIG_SMP
226 void sn_set_err_irq_affinity(unsigned int irq)
229 * On systems which support CPU disabling (SHub2), all error interrupts
230 * are targeted at the boot CPU.
232 if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT))
233 set_irq_affinity_info(irq, cpu_physical_id(0), 0);
235 #else
236 void sn_set_err_irq_affinity(unsigned int irq) { }
237 #endif
239 static void
240 sn_mask_irq(struct irq_data *data)
244 static void
245 sn_unmask_irq(struct irq_data *data)
249 struct irq_chip irq_type_sn = {
250 .name = "SN hub",
251 .irq_startup = sn_startup_irq,
252 .irq_shutdown = sn_shutdown_irq,
253 .irq_enable = sn_enable_irq,
254 .irq_disable = sn_disable_irq,
255 .irq_ack = sn_ack_irq,
256 .irq_mask = sn_mask_irq,
257 .irq_unmask = sn_unmask_irq,
258 .irq_set_affinity = sn_set_affinity_irq
261 ia64_vector sn_irq_to_vector(int irq)
263 if (irq >= IA64_NUM_VECTORS)
264 return 0;
265 return (ia64_vector)irq;
268 unsigned int sn_local_vector_to_irq(u8 vector)
270 return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));
273 void sn_irq_init(void)
275 int i;
277 ia64_first_device_vector = IA64_SN2_FIRST_DEVICE_VECTOR;
278 ia64_last_device_vector = IA64_SN2_LAST_DEVICE_VECTOR;
280 for (i = 0; i < NR_IRQS; i++) {
281 if (irq_get_chip(i) == &no_irq_chip)
282 irq_set_chip(i, &irq_type_sn);
286 static void register_intr_pda(struct sn_irq_info *sn_irq_info)
288 int irq = sn_irq_info->irq_irq;
289 int cpu = sn_irq_info->irq_cpuid;
291 if (pdacpu(cpu)->sn_last_irq < irq) {
292 pdacpu(cpu)->sn_last_irq = irq;
295 if (pdacpu(cpu)->sn_first_irq == 0 || pdacpu(cpu)->sn_first_irq > irq)
296 pdacpu(cpu)->sn_first_irq = irq;
299 static void unregister_intr_pda(struct sn_irq_info *sn_irq_info)
301 int irq = sn_irq_info->irq_irq;
302 int cpu = sn_irq_info->irq_cpuid;
303 struct sn_irq_info *tmp_irq_info;
304 int i, foundmatch;
306 rcu_read_lock();
307 if (pdacpu(cpu)->sn_last_irq == irq) {
308 foundmatch = 0;
309 for (i = pdacpu(cpu)->sn_last_irq - 1;
310 i && !foundmatch; i--) {
311 list_for_each_entry_rcu(tmp_irq_info,
312 sn_irq_lh[i],
313 list) {
314 if (tmp_irq_info->irq_cpuid == cpu) {
315 foundmatch = 1;
316 break;
320 pdacpu(cpu)->sn_last_irq = i;
323 if (pdacpu(cpu)->sn_first_irq == irq) {
324 foundmatch = 0;
325 for (i = pdacpu(cpu)->sn_first_irq + 1;
326 i < NR_IRQS && !foundmatch; i++) {
327 list_for_each_entry_rcu(tmp_irq_info,
328 sn_irq_lh[i],
329 list) {
330 if (tmp_irq_info->irq_cpuid == cpu) {
331 foundmatch = 1;
332 break;
336 pdacpu(cpu)->sn_first_irq = ((i == NR_IRQS) ? 0 : i);
338 rcu_read_unlock();
341 static void sn_irq_info_free(struct rcu_head *head)
343 struct sn_irq_info *sn_irq_info;
345 sn_irq_info = container_of(head, struct sn_irq_info, rcu);
346 kfree(sn_irq_info);
349 void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
351 nasid_t nasid = sn_irq_info->irq_nasid;
352 int slice = sn_irq_info->irq_slice;
353 int cpu = nasid_slice_to_cpuid(nasid, slice);
354 #ifdef CONFIG_SMP
355 int cpuphys;
356 #endif
358 pci_dev_get(pci_dev);
359 sn_irq_info->irq_cpuid = cpu;
360 sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);
362 /* link it into the sn_irq[irq] list */
363 spin_lock(&sn_irq_info_lock);
364 list_add_rcu(&sn_irq_info->list, sn_irq_lh[sn_irq_info->irq_irq]);
365 reserve_irq_vector(sn_irq_info->irq_irq);
366 spin_unlock(&sn_irq_info_lock);
368 register_intr_pda(sn_irq_info);
369 #ifdef CONFIG_SMP
370 cpuphys = cpu_physical_id(cpu);
371 set_irq_affinity_info(sn_irq_info->irq_irq, cpuphys, 0);
373 * Affinity was set by the PROM, prevent it from
374 * being reset by the request_irq() path.
376 irqd_mark_affinity_was_set(irq_get_irq_data(sn_irq_info->irq_irq));
377 #endif
380 void sn_irq_unfixup(struct pci_dev *pci_dev)
382 struct sn_irq_info *sn_irq_info;
384 /* Only cleanup IRQ stuff if this device has a host bus context */
385 if (!SN_PCIDEV_BUSSOFT(pci_dev))
386 return;
388 sn_irq_info = SN_PCIDEV_INFO(pci_dev)->pdi_sn_irq_info;
389 if (!sn_irq_info)
390 return;
391 if (!sn_irq_info->irq_irq) {
392 kfree(sn_irq_info);
393 return;
396 unregister_intr_pda(sn_irq_info);
397 spin_lock(&sn_irq_info_lock);
398 list_del_rcu(&sn_irq_info->list);
399 spin_unlock(&sn_irq_info_lock);
400 if (list_empty(sn_irq_lh[sn_irq_info->irq_irq]))
401 free_irq_vector(sn_irq_info->irq_irq);
402 call_rcu(&sn_irq_info->rcu, sn_irq_info_free);
403 pci_dev_put(pci_dev);
407 static inline void
408 sn_call_force_intr_provider(struct sn_irq_info *sn_irq_info)
410 struct sn_pcibus_provider *pci_provider;
412 pci_provider = sn_pci_provider[sn_irq_info->irq_bridge_type];
414 /* Don't force an interrupt if the irq has been disabled */
415 if (!irqd_irq_disabled(irq_get_irq_data(sn_irq_info->irq_irq)) &&
416 pci_provider && pci_provider->force_interrupt)
417 (*pci_provider->force_interrupt)(sn_irq_info);
421 * Check for lost interrupts. If the PIC int_status reg. says that
422 * an interrupt has been sent, but not handled, and the interrupt
423 * is not pending in either the cpu irr regs or in the soft irr regs,
424 * and the interrupt is not in service, then the interrupt may have
425 * been lost. Force an interrupt on that pin. It is possible that
426 * the interrupt is in flight, so we may generate a spurious interrupt,
427 * but we should never miss a real lost interrupt.
429 static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
431 u64 regval;
432 struct pcidev_info *pcidev_info;
433 struct pcibus_info *pcibus_info;
436 * Bridge types attached to TIO (anything but PIC) do not need this WAR
437 * since they do not target Shub II interrupt registers. If that
438 * ever changes, this check needs to accommodate.
440 if (sn_irq_info->irq_bridge_type != PCIIO_ASIC_TYPE_PIC)
441 return;
443 pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
444 if (!pcidev_info)
445 return;
447 pcibus_info =
448 (struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
449 pdi_pcibus_info;
450 regval = pcireg_intr_status_get(pcibus_info);
452 if (!ia64_get_irr(irq_to_vector(irq))) {
453 if (!test_bit(irq, pda->sn_in_service_ivecs)) {
454 regval &= 0xff;
455 if (sn_irq_info->irq_int_bit & regval &
456 sn_irq_info->irq_last_intr) {
457 regval &= ~(sn_irq_info->irq_int_bit & regval);
458 sn_call_force_intr_provider(sn_irq_info);
462 sn_irq_info->irq_last_intr = regval;
465 void sn_lb_int_war_check(void)
467 struct sn_irq_info *sn_irq_info;
468 int i;
470 if (!sn_ioif_inited || pda->sn_first_irq == 0)
471 return;
473 rcu_read_lock();
474 for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
475 list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[i], list) {
476 sn_check_intr(i, sn_irq_info);
479 rcu_read_unlock();
482 void __init sn_irq_lh_init(void)
484 int i;
486 sn_irq_lh = kmalloc(sizeof(struct list_head *) * NR_IRQS, GFP_KERNEL);
487 if (!sn_irq_lh)
488 panic("SN PCI INIT: Failed to allocate memory for PCI init\n");
490 for (i = 0; i < NR_IRQS; i++) {
491 sn_irq_lh[i] = kmalloc(sizeof(struct list_head), GFP_KERNEL);
492 if (!sn_irq_lh[i])
493 panic("SN PCI INIT: Failed IRQ memory allocation\n");
495 INIT_LIST_HEAD(sn_irq_lh[i]);