~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/ia64/sn/kernel/irq.c

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Platform dependent support for SGI SN
  3  *
  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.
  7  *
  8  * Copyright (c) 2000-2008 Silicon Graphics, Inc.  All Rights Reserved.
  9  */
 10 
 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>
 25 
 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);
 28 
 29 extern int sn_ioif_inited;
 30 struct list_head **sn_irq_lh;
 31 static DEFINE_SPINLOCK(sn_irq_info_lock); /* non-IRQ lock */
 32 
 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)
 37 {
 38         struct ia64_sal_retval ret_stuff;
 39         ret_stuff.status = 0;
 40         ret_stuff.v0 = 0;
 41 
 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);
 46 
 47         return ret_stuff.status;
 48 }
 49 
 50 void sn_intr_free(nasid_t local_nasid, int local_widget,
 51                                 struct sn_irq_info *sn_irq_info)
 52 {
 53         struct ia64_sal_retval ret_stuff;
 54         ret_stuff.status = 0;
 55         ret_stuff.v0 = 0;
 56 
 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);
 61 }
 62 
 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)
 66 {
 67         struct ia64_sal_retval ret_stuff;
 68         ret_stuff.status = 0;
 69         ret_stuff.v0 = 0;
 70 
 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);
 75 
 76         return ret_stuff.status;
 77 }
 78 
 79 static unsigned int sn_startup_irq(struct irq_data *data)
 80 {
 81         return 0;
 82 }
 83 
 84 static void sn_shutdown_irq(struct irq_data *data)
 85 {
 86 }
 87 
 88 extern void ia64_mca_register_cpev(int);
 89 
 90 static void sn_disable_irq(struct irq_data *data)
 91 {
 92         if (data->irq == local_vector_to_irq(IA64_CPE_VECTOR))
 93                 ia64_mca_register_cpev(0);
 94 }
 95 
 96 static void sn_enable_irq(struct irq_data *data)
 97 {
 98         if (data->irq == local_vector_to_irq(IA64_CPE_VECTOR))
 99                 ia64_mca_register_cpev(data->irq);
100 }
101 
102 static void sn_ack_irq(struct irq_data *data)
103 {
104         u64 event_occurred, mask;
105         unsigned int irq = data->irq & 0xff;
106 
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);
111 
112         irq_move_irq(data);
113 }
114 
115 struct sn_irq_info *sn_retarget_vector(struct sn_irq_info *sn_irq_info,
116                                        nasid_t nasid, int slice)
117 {
118         int vector;
119         int cpuid;
120 #ifdef CONFIG_SMP
121         int cpuphys;
122 #endif
123         int64_t bridge;
124         int local_widget, status;
125         nasid_t local_nasid;
126         struct sn_irq_info *new_irq_info;
127         struct sn_pcibus_provider *pci_provider;
128 
129         bridge = (u64) sn_irq_info->irq_bridge;
130         if (!bridge) {
131                 return NULL; /* irq is not a device interrupt */
132         }
133 
134         local_nasid = NASID_GET(bridge);
135 
136         if (local_nasid & 1)
137                 local_widget = TIO_SWIN_WIDGETNUM(bridge);
138         else
139                 local_widget = SWIN_WIDGETNUM(bridge);
140         vector = sn_irq_info->irq_irq;
141 
142         /* Make use of SAL_INTR_REDIRECT if PROM supports it */
143         status = sn_intr_redirect(local_nasid, local_widget, sn_irq_info, nasid, slice);
144         if (!status) {
145                 new_irq_info = sn_irq_info;
146                 goto finish_up;
147         }
148 
149         /*
150          * PROM does not support SAL_INTR_REDIRECT, or it failed.
151          * Revert to old method.
152          */
153         new_irq_info = kmemdup(sn_irq_info, sizeof(struct sn_irq_info),
154                                GFP_ATOMIC);
155         if (new_irq_info == NULL)
156                 return NULL;
157 
158         /* Free the old PROM new_irq_info structure */
159         sn_intr_free(local_nasid, local_widget, new_irq_info);
160         unregister_intr_pda(new_irq_info);
161 
162         /* allocate a new PROM new_irq_info struct */
163         status = sn_intr_alloc(local_nasid, local_widget,
164                                new_irq_info, vector,
165                                nasid, slice);
166 
167         /* SAL call failed */
168         if (status) {
169                 kfree(new_irq_info);
170                 return NULL;
171         }
172 
173         register_intr_pda(new_irq_info);
174         spin_lock(&sn_irq_info_lock);
175         list_replace_rcu(&sn_irq_info->list, &new_irq_info->list);
176         spin_unlock(&sn_irq_info_lock);
177         kfree_rcu(sn_irq_info, rcu);
178 
179 
180 finish_up:
181         /* Update kernels new_irq_info with new target info */
182         cpuid = nasid_slice_to_cpuid(new_irq_info->irq_nasid,
183                                      new_irq_info->irq_slice);
184         new_irq_info->irq_cpuid = cpuid;
185 
186         pci_provider = sn_pci_provider[new_irq_info->irq_bridge_type];
187 
188         /*
189          * If this represents a line interrupt, target it.  If it's
190          * an msi (irq_int_bit < 0), it's already targeted.
191          */
192         if (new_irq_info->irq_int_bit >= 0 &&
193             pci_provider && pci_provider->target_interrupt)
194                 (pci_provider->target_interrupt)(new_irq_info);
195 
196 #ifdef CONFIG_SMP
197         cpuphys = cpu_physical_id(cpuid);
198         set_irq_affinity_info((vector & 0xff), cpuphys, 0);
199 #endif
200 
201         return new_irq_info;
202 }
203 
204 static int sn_set_affinity_irq(struct irq_data *data,
205                                const struct cpumask *mask, bool force)
206 {
207         struct sn_irq_info *sn_irq_info, *sn_irq_info_safe;
208         unsigned int irq = data->irq;
209         nasid_t nasid;
210         int slice;
211 
212         nasid = cpuid_to_nasid(cpumask_first_and(mask, cpu_online_mask));
213         slice = cpuid_to_slice(cpumask_first_and(mask, cpu_online_mask));
214 
215         list_for_each_entry_safe(sn_irq_info, sn_irq_info_safe,
216                                  sn_irq_lh[irq], list)
217                 (void)sn_retarget_vector(sn_irq_info, nasid, slice);
218 
219         return 0;
220 }
221 
222 #ifdef CONFIG_SMP
223 void sn_set_err_irq_affinity(unsigned int irq)
224 {
225         /*
226          * On systems which support CPU disabling (SHub2), all error interrupts
227          * are targeted at the boot CPU.
228          */
229         if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT))
230                 set_irq_affinity_info(irq, cpu_physical_id(0), 0);
231 }
232 #else
233 void sn_set_err_irq_affinity(unsigned int irq) { }
234 #endif
235 
236 static void
237 sn_mask_irq(struct irq_data *data)
238 {
239 }
240 
241 static void
242 sn_unmask_irq(struct irq_data *data)
243 {
244 }
245 
246 struct irq_chip irq_type_sn = {
247         .name                   = "SN hub",
248         .irq_startup            = sn_startup_irq,
249         .irq_shutdown           = sn_shutdown_irq,
250         .irq_enable             = sn_enable_irq,
251         .irq_disable            = sn_disable_irq,
252         .irq_ack                = sn_ack_irq,
253         .irq_mask               = sn_mask_irq,
254         .irq_unmask             = sn_unmask_irq,
255         .irq_set_affinity       = sn_set_affinity_irq
256 };
257 
258 ia64_vector sn_irq_to_vector(int irq)
259 {
260         if (irq >= IA64_NUM_VECTORS)
261                 return 0;
262         return (ia64_vector)irq;
263 }
264 
265 unsigned int sn_local_vector_to_irq(u8 vector)
266 {
267         return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));
268 }
269 
270 void sn_irq_init(void)
271 {
272         int i;
273 
274         ia64_first_device_vector = IA64_SN2_FIRST_DEVICE_VECTOR;
275         ia64_last_device_vector = IA64_SN2_LAST_DEVICE_VECTOR;
276 
277         for (i = 0; i < NR_IRQS; i++) {
278                 if (irq_get_chip(i) == &no_irq_chip)
279                         irq_set_chip(i, &irq_type_sn);
280         }
281 }
282 
283 static void register_intr_pda(struct sn_irq_info *sn_irq_info)
284 {
285         int irq = sn_irq_info->irq_irq;
286         int cpu = sn_irq_info->irq_cpuid;
287 
288         if (pdacpu(cpu)->sn_last_irq < irq) {
289                 pdacpu(cpu)->sn_last_irq = irq;
290         }
291 
292         if (pdacpu(cpu)->sn_first_irq == 0 || pdacpu(cpu)->sn_first_irq > irq)
293                 pdacpu(cpu)->sn_first_irq = irq;
294 }
295 
296 static void unregister_intr_pda(struct sn_irq_info *sn_irq_info)
297 {
298         int irq = sn_irq_info->irq_irq;
299         int cpu = sn_irq_info->irq_cpuid;
300         struct sn_irq_info *tmp_irq_info;
301         int i, foundmatch;
302 
303         rcu_read_lock();
304         if (pdacpu(cpu)->sn_last_irq == irq) {
305                 foundmatch = 0;
306                 for (i = pdacpu(cpu)->sn_last_irq - 1;
307                      i && !foundmatch; i--) {
308                         list_for_each_entry_rcu(tmp_irq_info,
309                                                 sn_irq_lh[i],
310                                                 list) {
311                                 if (tmp_irq_info->irq_cpuid == cpu) {
312                                         foundmatch = 1;
313                                         break;
314                                 }
315                         }
316                 }
317                 pdacpu(cpu)->sn_last_irq = i;
318         }
319 
320         if (pdacpu(cpu)->sn_first_irq == irq) {
321                 foundmatch = 0;
322                 for (i = pdacpu(cpu)->sn_first_irq + 1;
323                      i < NR_IRQS && !foundmatch; i++) {
324                         list_for_each_entry_rcu(tmp_irq_info,
325                                                 sn_irq_lh[i],
326                                                 list) {
327                                 if (tmp_irq_info->irq_cpuid == cpu) {
328                                         foundmatch = 1;
329                                         break;
330                                 }
331                         }
332                 }
333                 pdacpu(cpu)->sn_first_irq = ((i == NR_IRQS) ? 0 : i);
334         }
335         rcu_read_unlock();
336 }
337 
338 void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
339 {
340         nasid_t nasid = sn_irq_info->irq_nasid;
341         int slice = sn_irq_info->irq_slice;
342         int cpu = nasid_slice_to_cpuid(nasid, slice);
343 #ifdef CONFIG_SMP
344         int cpuphys;
345 #endif
346 
347         pci_dev_get(pci_dev);
348         sn_irq_info->irq_cpuid = cpu;
349         sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);
350 
351         /* link it into the sn_irq[irq] list */
352         spin_lock(&sn_irq_info_lock);
353         list_add_rcu(&sn_irq_info->list, sn_irq_lh[sn_irq_info->irq_irq]);
354         reserve_irq_vector(sn_irq_info->irq_irq);
355         if (sn_irq_info->irq_int_bit != -1)
356                 irq_set_handler(sn_irq_info->irq_irq, handle_level_irq);
357         spin_unlock(&sn_irq_info_lock);
358 
359         register_intr_pda(sn_irq_info);
360 #ifdef CONFIG_SMP
361         cpuphys = cpu_physical_id(cpu);
362         set_irq_affinity_info(sn_irq_info->irq_irq, cpuphys, 0);
363         /*
364          * Affinity was set by the PROM, prevent it from
365          * being reset by the request_irq() path.
366          */
367         irqd_mark_affinity_was_set(irq_get_irq_data(sn_irq_info->irq_irq));
368 #endif
369 }
370 
371 void sn_irq_unfixup(struct pci_dev *pci_dev)
372 {
373         struct sn_irq_info *sn_irq_info;
374 
375         /* Only cleanup IRQ stuff if this device has a host bus context */
376         if (!SN_PCIDEV_BUSSOFT(pci_dev))
377                 return;
378 
379         sn_irq_info = SN_PCIDEV_INFO(pci_dev)->pdi_sn_irq_info;
380         if (!sn_irq_info)
381                 return;
382         if (!sn_irq_info->irq_irq) {
383                 kfree(sn_irq_info);
384                 return;
385         }
386 
387         unregister_intr_pda(sn_irq_info);
388         spin_lock(&sn_irq_info_lock);
389         list_del_rcu(&sn_irq_info->list);
390         spin_unlock(&sn_irq_info_lock);
391         if (list_empty(sn_irq_lh[sn_irq_info->irq_irq]))
392                 free_irq_vector(sn_irq_info->irq_irq);
393         kfree_rcu(sn_irq_info, rcu);
394         pci_dev_put(pci_dev);
395 
396 }
397 
398 static inline void
399 sn_call_force_intr_provider(struct sn_irq_info *sn_irq_info)
400 {
401         struct sn_pcibus_provider *pci_provider;
402 
403         pci_provider = sn_pci_provider[sn_irq_info->irq_bridge_type];
404 
405         /* Don't force an interrupt if the irq has been disabled */
406         if (!irqd_irq_disabled(irq_get_irq_data(sn_irq_info->irq_irq)) &&
407             pci_provider && pci_provider->force_interrupt)
408                 (*pci_provider->force_interrupt)(sn_irq_info);
409 }
410 
411 /*
412  * Check for lost interrupts.  If the PIC int_status reg. says that
413  * an interrupt has been sent, but not handled, and the interrupt
414  * is not pending in either the cpu irr regs or in the soft irr regs,
415  * and the interrupt is not in service, then the interrupt may have
416  * been lost.  Force an interrupt on that pin.  It is possible that
417  * the interrupt is in flight, so we may generate a spurious interrupt,
418  * but we should never miss a real lost interrupt.
419  */
420 static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
421 {
422         u64 regval;
423         struct pcidev_info *pcidev_info;
424         struct pcibus_info *pcibus_info;
425 
426         /*
427          * Bridge types attached to TIO (anything but PIC) do not need this WAR
428          * since they do not target Shub II interrupt registers.  If that
429          * ever changes, this check needs to accommodate.
430          */
431         if (sn_irq_info->irq_bridge_type != PCIIO_ASIC_TYPE_PIC)
432                 return;
433 
434         pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
435         if (!pcidev_info)
436                 return;
437 
438         pcibus_info =
439             (struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
440             pdi_pcibus_info;
441         regval = pcireg_intr_status_get(pcibus_info);
442 
443         if (!ia64_get_irr(irq_to_vector(irq))) {
444                 if (!test_bit(irq, pda->sn_in_service_ivecs)) {
445                         regval &= 0xff;
446                         if (sn_irq_info->irq_int_bit & regval &
447                             sn_irq_info->irq_last_intr) {
448                                 regval &= ~(sn_irq_info->irq_int_bit & regval);
449                                 sn_call_force_intr_provider(sn_irq_info);
450                         }
451                 }
452         }
453         sn_irq_info->irq_last_intr = regval;
454 }
455 
456 void sn_lb_int_war_check(void)
457 {
458         struct sn_irq_info *sn_irq_info;
459         int i;
460 
461         if (!sn_ioif_inited || pda->sn_first_irq == 0)
462                 return;
463 
464         rcu_read_lock();
465         for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
466                 list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[i], list) {
467                         sn_check_intr(i, sn_irq_info);
468                 }
469         }
470         rcu_read_unlock();
471 }
472 
473 void __init sn_irq_lh_init(void)
474 {
475         int i;
476 
477         sn_irq_lh = kmalloc(sizeof(struct list_head *) * NR_IRQS, GFP_KERNEL);
478         if (!sn_irq_lh)
479                 panic("SN PCI INIT: Failed to allocate memory for PCI init\n");
480 
481         for (i = 0; i < NR_IRQS; i++) {
482                 sn_irq_lh[i] = kmalloc(sizeof(struct list_head), GFP_KERNEL);
483                 if (!sn_irq_lh[i])
484                         panic("SN PCI INIT: Failed IRQ memory allocation\n");
485 
486                 INIT_LIST_HEAD(sn_irq_lh[i]);
487         }
488 }
489 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp