2 * linux/arch/ia64/kernel/irq_ia64.c
4 * Copyright (C) 1998-2001 Hewlett-Packard Co
5 * Stephane Eranian <eranian@hpl.hp.com>
6 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * 6/10/99: Updated to bring in sync with x86 version to facilitate
9 * support for SMP and different interrupt controllers.
11 * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
12 * PCI to vector allocation routine.
13 * 04/14/2004 Ashok Raj <ashok.raj@intel.com>
14 * Added CPU Hotplug handling for IPF.
17 #include <linux/module.h>
19 #include <linux/jiffies.h>
20 #include <linux/errno.h>
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/ioport.h>
24 #include <linux/kernel_stat.h>
25 #include <linux/slab.h>
26 #include <linux/ptrace.h>
27 #include <linux/random.h> /* for rand_initialize_irq() */
28 #include <linux/signal.h>
29 #include <linux/smp.h>
30 #include <linux/threads.h>
31 #include <linux/bitops.h>
32 #include <linux/irq.h>
34 #include <asm/delay.h>
35 #include <asm/intrinsics.h>
37 #include <asm/hw_irq.h>
38 #include <asm/machvec.h>
39 #include <asm/pgtable.h>
40 #include <asm/system.h>
41 #include <asm/tlbflush.h>
44 # include <asm/perfmon.h>
49 #define IRQ_VECTOR_UNASSIGNED (0)
51 #define IRQ_UNUSED (0)
55 /* These can be overridden in platform_irq_init */
56 int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
57 int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
59 /* default base addr of IPI table */
60 void __iomem *ipi_base_addr = ((void __iomem *)
61 (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
63 static cpumask_t vector_allocation_domain(int cpu);
66 * Legacy IRQ to IA-64 vector translation table.
68 __u8 isa_irq_to_vector_map[16] = {
69 /* 8259 IRQ translation, first 16 entries */
70 0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
71 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
73 EXPORT_SYMBOL(isa_irq_to_vector_map);
75 DEFINE_SPINLOCK(vector_lock);
77 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
78 [0 ... NR_IRQS - 1] = {
79 .vector = IRQ_VECTOR_UNASSIGNED,
80 .domain = CPU_MASK_NONE
84 DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
85 [0 ... IA64_NUM_VECTORS - 1] = IA64_SPURIOUS_INT_VECTOR
88 static cpumask_t vector_table[IA64_MAX_DEVICE_VECTORS] = {
89 [0 ... IA64_MAX_DEVICE_VECTORS - 1] = CPU_MASK_NONE
92 static int irq_status[NR_IRQS] = {
93 [0 ... NR_IRQS -1] = IRQ_UNUSED
96 int check_irq_used(int irq)
98 if (irq_status[irq] == IRQ_USED)
104 static void reserve_irq(unsigned int irq)
108 spin_lock_irqsave(&vector_lock, flags);
109 irq_status[irq] = IRQ_RSVD;
110 spin_unlock_irqrestore(&vector_lock, flags);
113 static inline int find_unassigned_irq(void)
117 for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
118 if (irq_status[irq] == IRQ_UNUSED)
123 static inline int find_unassigned_vector(cpumask_t domain)
128 cpus_and(mask, domain, cpu_online_map);
129 if (cpus_empty(mask))
132 for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
133 cpus_and(mask, domain, vector_table[pos]);
134 if (!cpus_empty(mask))
136 return IA64_FIRST_DEVICE_VECTOR + pos;
141 static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
145 struct irq_cfg *cfg = &irq_cfg[irq];
147 cpus_and(mask, domain, cpu_online_map);
148 if (cpus_empty(mask))
150 if ((cfg->vector == vector) && cpus_equal(cfg->domain, domain))
152 if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
154 for_each_cpu_mask(cpu, mask)
155 per_cpu(vector_irq, cpu)[vector] = irq;
156 cfg->vector = vector;
157 cfg->domain = domain;
158 irq_status[irq] = IRQ_USED;
159 pos = vector - IA64_FIRST_DEVICE_VECTOR;
160 cpus_or(vector_table[pos], vector_table[pos], domain);
164 int bind_irq_vector(int irq, int vector, cpumask_t domain)
169 spin_lock_irqsave(&vector_lock, flags);
170 ret = __bind_irq_vector(irq, vector, domain);
171 spin_unlock_irqrestore(&vector_lock, flags);
175 static void __clear_irq_vector(int irq)
177 int vector, cpu, pos;
180 struct irq_cfg *cfg = &irq_cfg[irq];
182 BUG_ON((unsigned)irq >= NR_IRQS);
183 BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
184 vector = cfg->vector;
185 domain = cfg->domain;
186 cpus_and(mask, cfg->domain, cpu_online_map);
187 for_each_cpu_mask(cpu, mask)
188 per_cpu(vector_irq, cpu)[vector] = IA64_SPURIOUS_INT_VECTOR;
189 cfg->vector = IRQ_VECTOR_UNASSIGNED;
190 cfg->domain = CPU_MASK_NONE;
191 irq_status[irq] = IRQ_UNUSED;
192 pos = vector - IA64_FIRST_DEVICE_VECTOR;
193 cpus_andnot(vector_table[pos], vector_table[pos], domain);
196 static void clear_irq_vector(int irq)
200 spin_lock_irqsave(&vector_lock, flags);
201 __clear_irq_vector(irq);
202 spin_unlock_irqrestore(&vector_lock, flags);
206 assign_irq_vector (int irq)
214 spin_lock_irqsave(&vector_lock, flags);
215 for_each_online_cpu(cpu) {
216 domain = vector_allocation_domain(cpu);
217 vector = find_unassigned_vector(domain);
223 if (irq == AUTO_ASSIGN)
225 BUG_ON(__bind_irq_vector(irq, vector, domain));
227 spin_unlock_irqrestore(&vector_lock, flags);
232 free_irq_vector (int vector)
234 if (vector < IA64_FIRST_DEVICE_VECTOR ||
235 vector > IA64_LAST_DEVICE_VECTOR)
237 clear_irq_vector(vector);
241 reserve_irq_vector (int vector)
243 if (vector < IA64_FIRST_DEVICE_VECTOR ||
244 vector > IA64_LAST_DEVICE_VECTOR)
246 return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
250 * Initialize vector_irq on a new cpu. This function must be called
251 * with vector_lock held.
253 void __setup_vector_irq(int cpu)
257 /* Clear vector_irq */
258 for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
259 per_cpu(vector_irq, cpu)[vector] = IA64_SPURIOUS_INT_VECTOR;
260 /* Mark the inuse vectors */
261 for (irq = 0; irq < NR_IRQS; ++irq) {
262 if (!cpu_isset(cpu, irq_cfg[irq].domain))
264 vector = irq_to_vector(irq);
265 per_cpu(vector_irq, cpu)[vector] = irq;
269 #if defined(CONFIG_SMP) && (defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG))
270 static enum vector_domain_type {
273 } vector_domain_type = VECTOR_DOMAIN_NONE;
275 static cpumask_t vector_allocation_domain(int cpu)
277 if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
278 return cpumask_of_cpu(cpu);
282 static int __init parse_vector_domain(char *arg)
286 if (!strcmp(arg, "percpu")) {
287 vector_domain_type = VECTOR_DOMAIN_PERCPU;
292 early_param("vector", parse_vector_domain);
294 static cpumask_t vector_allocation_domain(int cpu)
301 void destroy_and_reserve_irq(unsigned int irq)
303 dynamic_irq_cleanup(irq);
305 clear_irq_vector(irq);
309 static int __reassign_irq_vector(int irq, int cpu)
311 struct irq_cfg *cfg = &irq_cfg[irq];
315 if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
317 if (cpu_isset(cpu, cfg->domain))
319 domain = vector_allocation_domain(cpu);
320 vector = find_unassigned_vector(domain);
323 __clear_irq_vector(irq);
324 BUG_ON(__bind_irq_vector(irq, vector, domain));
328 int reassign_irq_vector(int irq, int cpu)
333 spin_lock_irqsave(&vector_lock, flags);
334 ret = __reassign_irq_vector(irq, cpu);
335 spin_unlock_irqrestore(&vector_lock, flags);
340 * Dynamic irq allocate and deallocation for MSI
345 int irq, vector, cpu;
348 irq = vector = -ENOSPC;
349 spin_lock_irqsave(&vector_lock, flags);
350 for_each_online_cpu(cpu) {
351 domain = vector_allocation_domain(cpu);
352 vector = find_unassigned_vector(domain);
358 irq = find_unassigned_irq();
361 BUG_ON(__bind_irq_vector(irq, vector, domain));
363 spin_unlock_irqrestore(&vector_lock, flags);
365 dynamic_irq_init(irq);
369 void destroy_irq(unsigned int irq)
371 dynamic_irq_cleanup(irq);
372 clear_irq_vector(irq);
376 # define IS_RESCHEDULE(vec) (vec == IA64_IPI_RESCHEDULE)
377 # define IS_LOCAL_TLB_FLUSH(vec) (vec == IA64_IPI_LOCAL_TLB_FLUSH)
379 # define IS_RESCHEDULE(vec) (0)
380 # define IS_LOCAL_TLB_FLUSH(vec) (0)
383 * That's where the IVT branches when we get an external
384 * interrupt. This branches to the correct hardware IRQ handler via
388 ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
390 struct pt_regs *old_regs = set_irq_regs(regs);
391 unsigned long saved_tpr;
395 unsigned long bsp, sp;
398 * Note: if the interrupt happened while executing in
399 * the context switch routine (ia64_switch_to), we may
400 * get a spurious stack overflow here. This is
401 * because the register and the memory stack are not
402 * switched atomically.
404 bsp = ia64_getreg(_IA64_REG_AR_BSP);
405 sp = ia64_getreg(_IA64_REG_SP);
407 if ((sp - bsp) < 1024) {
408 static unsigned char count;
409 static long last_time;
411 if (jiffies - last_time > 5*HZ)
415 printk("ia64_handle_irq: DANGER: less than "
416 "1KB of free stack space!!\n"
417 "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
421 #endif /* IRQ_DEBUG */
424 * Always set TPR to limit maximum interrupt nesting depth to
425 * 16 (without this, it would be ~240, which could easily lead
426 * to kernel stack overflows).
429 saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
431 while (vector != IA64_SPURIOUS_INT_VECTOR) {
432 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
433 smp_local_flush_tlb();
434 kstat_this_cpu.irqs[vector]++;
435 } else if (unlikely(IS_RESCHEDULE(vector)))
436 kstat_this_cpu.irqs[vector]++;
438 ia64_setreg(_IA64_REG_CR_TPR, vector);
441 generic_handle_irq(local_vector_to_irq(vector));
444 * Disable interrupts and send EOI:
447 ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
450 vector = ia64_get_ivr();
453 * This must be done *after* the ia64_eoi(). For example, the keyboard softirq
454 * handler needs to be able to wait for further keyboard interrupts, which can't
455 * come through until ia64_eoi() has been done.
458 set_irq_regs(old_regs);
461 #ifdef CONFIG_HOTPLUG_CPU
463 * This function emulates a interrupt processing when a cpu is about to be
466 void ia64_process_pending_intr(void)
469 unsigned long saved_tpr;
470 extern unsigned int vectors_in_migration[NR_IRQS];
472 vector = ia64_get_ivr();
475 saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
479 * Perform normal interrupt style processing
481 while (vector != IA64_SPURIOUS_INT_VECTOR) {
482 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
483 smp_local_flush_tlb();
484 kstat_this_cpu.irqs[vector]++;
485 } else if (unlikely(IS_RESCHEDULE(vector)))
486 kstat_this_cpu.irqs[vector]++;
488 struct pt_regs *old_regs = set_irq_regs(NULL);
490 ia64_setreg(_IA64_REG_CR_TPR, vector);
494 * Now try calling normal ia64_handle_irq as it would have got called
495 * from a real intr handler. Try passing null for pt_regs, hopefully
496 * it will work. I hope it works!.
497 * Probably could shared code.
499 vectors_in_migration[local_vector_to_irq(vector)]=0;
500 generic_handle_irq(local_vector_to_irq(vector));
501 set_irq_regs(old_regs);
504 * Disable interrupts and send EOI
507 ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
510 vector = ia64_get_ivr();
519 static irqreturn_t dummy_handler (int irq, void *dev_id)
523 extern irqreturn_t handle_IPI (int irq, void *dev_id);
525 static struct irqaction ipi_irqaction = {
526 .handler = handle_IPI,
527 .flags = IRQF_DISABLED,
531 static struct irqaction resched_irqaction = {
532 .handler = dummy_handler,
533 .flags = IRQF_DISABLED,
537 static struct irqaction tlb_irqaction = {
538 .handler = dummy_handler,
539 .flags = IRQF_DISABLED,
546 register_percpu_irq (ia64_vector vec, struct irqaction *action)
552 BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
553 desc = irq_desc + irq;
554 desc->status |= IRQ_PER_CPU;
555 desc->chip = &irq_type_ia64_lsapic;
557 setup_irq(irq, action);
563 register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
565 register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
566 register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
567 register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
569 #ifdef CONFIG_PERFMON
576 ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
578 void __iomem *ipi_addr;
579 unsigned long ipi_data;
580 unsigned long phys_cpu_id;
583 phys_cpu_id = cpu_physical_id(cpu);
585 phys_cpu_id = (ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff;
589 * cpu number is in 8bit ID and 8bit EID
592 ipi_data = (delivery_mode << 8) | (vector & 0xff);
593 ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3));
595 writeq(ipi_data, ipi_addr);