/* * Intel IO-APIC support for multi-Pentium hosts. * * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo * * Many thanks to Stig Venaas for trying out countless experimental * patches and reporting/debugging problems patiently! * * (c) 1999, Multiple IO-APIC support, developed by * Ken-ichi Yaku and * Hidemi Kishimoto , * further tested and cleaned up by Zach Brown * and Ingo Molnar * * Fixes * Maciej W. Rozycki : Bits for genuine 82489DX APICs; * thanks to Eric Gilmore * and Rolf G. Tews * for testing these extensively * Paul Diefenbaugh : Added full ACPI support */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* time_after() */ #include #include #include #include #include #include #include #include #include #include int (*ioapic_renumber_irq)(int ioapic, int irq); atomic_t irq_mis_count; /* Where if anywhere is the i8259 connect in external int mode */ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; static DEFINE_SPINLOCK(ioapic_lock); static DEFINE_SPINLOCK(vector_lock); int timer_over_8254 __initdata = 1; /* * Is the SiS APIC rmw bug present ? * -1 = don't know, 0 = no, 1 = yes */ int sis_apic_bug = -1; /* * # of IRQ routing registers */ int nr_ioapic_registers[MAX_IO_APICS]; /* I/O APIC entries */ struct mp_config_ioapic mp_ioapics[MAX_IO_APICS]; int nr_ioapics; /* MP IRQ source entries */ struct mp_config_intsrc mp_irqs[MAX_IRQ_SOURCES]; /* # of MP IRQ source entries */ int mp_irq_entries; #if defined (CONFIG_MCA) || defined (CONFIG_EISA) int mp_bus_id_to_type[MAX_MP_BUSSES]; #endif DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES); static int disable_timer_pin_1 __initdata; /* * Rough estimation of how many shared IRQs there are, can * be changed anytime. */ #define MAX_PLUS_SHARED_IRQS NR_IRQS #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS) /* * This is performance-critical, we want to do it O(1) * * the indexing order of this array favors 1:1 mappings * between pins and IRQs. */ static struct irq_pin_list { int apic, pin, next; } irq_2_pin[PIN_MAP_SIZE]; struct io_apic { unsigned int index; unsigned int unused[3]; unsigned int data; }; static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx) { return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx) + (mp_ioapics[idx].mp_apicaddr & ~PAGE_MASK); } static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg) { struct io_apic __iomem *io_apic = io_apic_base(apic); writel(reg, &io_apic->index); return readl(&io_apic->data); } static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value) { struct io_apic __iomem *io_apic = io_apic_base(apic); writel(reg, &io_apic->index); writel(value, &io_apic->data); } /* * Re-write a value: to be used for read-modify-write * cycles where the read already set up the index register. * * Older SiS APIC requires we rewrite the index register */ static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value) { volatile struct io_apic __iomem *io_apic = io_apic_base(apic); if (sis_apic_bug) writel(reg, &io_apic->index); writel(value, &io_apic->data); } union entry_union { struct { u32 w1, w2; }; struct IO_APIC_route_entry entry; }; static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin) { union entry_union eu; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); eu.w1 = io_apic_read(apic, 0x10 + 2 * pin); eu.w2 = io_apic_read(apic, 0x11 + 2 * pin); spin_unlock_irqrestore(&ioapic_lock, flags); return eu.entry; } /* * When we write a new IO APIC routing entry, we need to write the high * word first! If the mask bit in the low word is clear, we will enable * the interrupt, and we need to make sure the entry is fully populated * before that happens. */ static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e) { union entry_union eu; eu.entry = e; io_apic_write(apic, 0x11 + 2*pin, eu.w2); io_apic_write(apic, 0x10 + 2*pin, eu.w1); } static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e) { unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); __ioapic_write_entry(apic, pin, e); spin_unlock_irqrestore(&ioapic_lock, flags); } /* * When we mask an IO APIC routing entry, we need to write the low * word first, in order to set the mask bit before we change the * high bits! */ static void ioapic_mask_entry(int apic, int pin) { unsigned long flags; union entry_union eu = { .entry.mask = 1 }; spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(apic, 0x10 + 2*pin, eu.w1); io_apic_write(apic, 0x11 + 2*pin, eu.w2); spin_unlock_irqrestore(&ioapic_lock, flags); } /* * The common case is 1:1 IRQ<->pin mappings. Sometimes there are * shared ISA-space IRQs, so we have to support them. We are super * fast in the common case, and fast for shared ISA-space IRQs. */ static void add_pin_to_irq(unsigned int irq, int apic, int pin) { static int first_free_entry = NR_IRQS; struct irq_pin_list *entry = irq_2_pin + irq; while (entry->next) entry = irq_2_pin + entry->next; if (entry->pin != -1) { entry->next = first_free_entry; entry = irq_2_pin + entry->next; if (++first_free_entry >= PIN_MAP_SIZE) panic("io_apic.c: whoops"); } entry->apic = apic; entry->pin = pin; } /* * Reroute an IRQ to a different pin. */ static void __init replace_pin_at_irq(unsigned int irq, int oldapic, int oldpin, int newapic, int newpin) { struct irq_pin_list *entry = irq_2_pin + irq; while (1) { if (entry->apic == oldapic && entry->pin == oldpin) { entry->apic = newapic; entry->pin = newpin; } if (!entry->next) break; entry = irq_2_pin + entry->next; } } static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable) { struct irq_pin_list *entry = irq_2_pin + irq; unsigned int pin, reg; for (;;) { pin = entry->pin; if (pin == -1) break; reg = io_apic_read(entry->apic, 0x10 + pin*2); reg &= ~disable; reg |= enable; io_apic_modify(entry->apic, 0x10 + pin*2, reg); if (!entry->next) break; entry = irq_2_pin + entry->next; } } /* mask = 1 */ static void __mask_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0x00010000, 0); } /* mask = 0 */ static void __unmask_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0, 0x00010000); } /* mask = 1, trigger = 0 */ static void __mask_and_edge_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0x00010000, 0x00008000); } /* mask = 0, trigger = 1 */ static void __unmask_and_level_IO_APIC_irq (unsigned int irq) { __modify_IO_APIC_irq(irq, 0x00008000, 0x00010000); } static void mask_IO_APIC_irq (unsigned int irq) { unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); __mask_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); } static void unmask_IO_APIC_irq (unsigned int irq) { unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); __unmask_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); } static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) { struct IO_APIC_route_entry entry; /* Check delivery_mode to be sure we're not clearing an SMI pin */ entry = ioapic_read_entry(apic, pin); if (entry.delivery_mode == dest_SMI) return; /* * Disable it in the IO-APIC irq-routing table: */ ioapic_mask_entry(apic, pin); } static void clear_IO_APIC (void) { int apic, pin; for (apic = 0; apic < nr_ioapics; apic++) for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) clear_IO_APIC_pin(apic, pin); } #ifdef CONFIG_SMP static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask) { unsigned long flags; int pin; struct irq_pin_list *entry = irq_2_pin + irq; unsigned int apicid_value; cpumask_t tmp; cpus_and(tmp, cpumask, cpu_online_map); if (cpus_empty(tmp)) tmp = TARGET_CPUS; cpus_and(cpumask, tmp, CPU_MASK_ALL); apicid_value = cpu_mask_to_apicid(cpumask); /* Prepare to do the io_apic_write */ apicid_value = apicid_value << 24; spin_lock_irqsave(&ioapic_lock, flags); for (;;) { pin = entry->pin; if (pin == -1) break; io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value); if (!entry->next) break; entry = irq_2_pin + entry->next; } irq_desc[irq].affinity = cpumask; spin_unlock_irqrestore(&ioapic_lock, flags); } #if defined(CONFIG_IRQBALANCE) # include /* kernel_thread() */ # include /* kstat */ # include /* kmalloc() */ # include #define IRQBALANCE_CHECK_ARCH -999 #define MAX_BALANCED_IRQ_INTERVAL (5*HZ) #define MIN_BALANCED_IRQ_INTERVAL (HZ/2) #define BALANCED_IRQ_MORE_DELTA (HZ/10) #define BALANCED_IRQ_LESS_DELTA (HZ) static int irqbalance_disabled __read_mostly = IRQBALANCE_CHECK_ARCH; static int physical_balance __read_mostly; static long balanced_irq_interval __read_mostly = MAX_BALANCED_IRQ_INTERVAL; static struct irq_cpu_info { unsigned long * last_irq; unsigned long * irq_delta; unsigned long irq; } irq_cpu_data[NR_CPUS]; #define CPU_IRQ(cpu) (irq_cpu_data[cpu].irq) #define LAST_CPU_IRQ(cpu,irq) (irq_cpu_data[cpu].last_irq[irq]) #define IRQ_DELTA(cpu,irq) (irq_cpu_data[cpu].irq_delta[irq]) #define IDLE_ENOUGH(cpu,now) \ (idle_cpu(cpu) && ((now) - per_cpu(irq_stat, (cpu)).idle_timestamp > 1)) #define IRQ_ALLOWED(cpu, allowed_mask) cpu_isset(cpu, allowed_mask) #define CPU_TO_PACKAGEINDEX(i) (first_cpu(per_cpu(cpu_sibling_map, i))) static cpumask_t balance_irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL }; void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) { balance_irq_affinity[irq] = mask; } static unsigned long move(int curr_cpu, cpumask_t allowed_mask, unsigned long now, int direction) { int search_idle = 1; int cpu = curr_cpu; goto inside; do { if (unlikely(cpu == curr_cpu)) search_idle = 0; inside: if (direction == 1) { cpu++; if (cpu >= NR_CPUS) cpu = 0; } else { cpu--; if (cpu == -1) cpu = NR_CPUS-1; } } while (!cpu_online(cpu) || !IRQ_ALLOWED(cpu,allowed_mask) || (search_idle && !IDLE_ENOUGH(cpu,now))); return cpu; } static inline void balance_irq(int cpu, int irq) { unsigned long now = jiffies; cpumask_t allowed_mask; unsigned int new_cpu; if (irqbalance_disabled) return; cpus_and(allowed_mask, cpu_online_map, balance_irq_affinity[irq]); new_cpu = move(cpu, allowed_mask, now, 1); if (cpu != new_cpu) { set_pending_irq(irq, cpumask_of_cpu(new_cpu)); } } static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold) { int i, j; for_each_online_cpu(i) { for (j = 0; j < NR_IRQS; j++) { if (!irq_desc[j].action) continue; /* Is it a significant load ? */ if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i),j) < useful_load_threshold) continue; balance_irq(i, j); } } balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL, balanced_irq_interval - BALANCED_IRQ_LESS_DELTA); return; } static void do_irq_balance(void) { int i, j; unsigned long max_cpu_irq = 0, min_cpu_irq = (~0); unsigned long move_this_load = 0; int max_loaded = 0, min_loaded = 0; int load; unsigned long useful_load_threshold = balanced_irq_interval + 10; int selected_irq; int tmp_loaded, first_attempt = 1; unsigned long tmp_cpu_irq; unsigned long imbalance = 0; cpumask_t allowed_mask, target_cpu_mask, tmp; for_each_possible_cpu(i) { int package_index; CPU_IRQ(i) = 0; if (!cpu_online(i)) continue; package_index = CPU_TO_PACKAGEINDEX(i); for (j = 0; j < NR_IRQS; j++) { unsigned long value_now, delta; /* Is this an active IRQ or balancing disabled ? */ if (!irq_desc[j].action || irq_balancing_disabled(j)) continue; if ( package_index == i ) IRQ_DELTA(package_index,j) = 0; /* Determine the total count per processor per IRQ */ value_now = (unsigned long) kstat_cpu(i).irqs[j]; /* Determine the activity per processor per IRQ */ delta = value_now - LAST_CPU_IRQ(i,j); /* Update last_cpu_irq[][] for the next time */ LAST_CPU_IRQ(i,j) = value_now; /* Ignore IRQs whose rate is less than the clock */ if (delta < useful_load_threshold) continue; /* update the load for the processor or package total */ IRQ_DELTA(package_index,j) += delta; /* Keep track of the higher numbered sibling as well */ if (i != package_index) CPU_IRQ(i) += delta; /* * We have sibling A and sibling B in the package * * cpu_irq[A] = load for cpu A + load for cpu B * cpu_irq[B] = load for cpu B */ CPU_IRQ(package_index) += delta; } } /* Find the least loaded processor package */ for_each_online_cpu(i) { if (i != CPU_TO_PACKAGEINDEX(i)) continue; if (min_cpu_irq > CPU_IRQ(i)) { min_cpu_irq = CPU_IRQ(i); min_loaded = i; } } max_cpu_irq = ULONG_MAX; tryanothercpu: /* Look for heaviest loaded processor. * We may come back to get the next heaviest loaded processor. * Skip processors with trivial loads. */ tmp_cpu_irq = 0; tmp_loaded = -1; for_each_online_cpu(i) { if (i != CPU_TO_PACKAGEINDEX(i)) continue; if (max_cpu_irq <= CPU_IRQ(i)) continue; if (tmp_cpu_irq < CPU_IRQ(i)) { tmp_cpu_irq = CPU_IRQ(i); tmp_loaded = i; } } if (tmp_loaded == -1) { /* In the case of small number of heavy interrupt sources, * loading some of the cpus too much. We use Ingo's original * approach to rotate them around. */ if (!first_attempt && imbalance >= useful_load_threshold) { rotate_irqs_among_cpus(useful_load_threshold); return; } goto not_worth_the_effort; } first_attempt = 0; /* heaviest search */ max_cpu_irq = tmp_cpu_irq; /* load */ max_loaded = tmp_loaded; /* processor */ imbalance = (max_cpu_irq - min_cpu_irq) / 2; /* if imbalance is less than approx 10% of max load, then * observe diminishing returns action. - quit */ if (imbalance < (max_cpu_irq >> 3)) goto not_worth_the_effort; tryanotherirq: /* if we select an IRQ to move that can't go where we want, then * see if there is another one to try. */ move_this_load = 0; selected_irq = -1; for (j = 0; j < NR_IRQS; j++) { /* Is this an active IRQ? */ if (!irq_desc[j].action) continue; if (imbalance <= IRQ_DELTA(max_loaded,j)) continue; /* Try to find the IRQ that is closest to the imbalance * without going over. */ if (move_this_load < IRQ_DELTA(max_loaded,j)) { move_this_load = IRQ_DELTA(max_loaded,j); selected_irq = j; } } if (selected_irq == -1) { goto tryanothercpu; } imbalance = move_this_load; /* For physical_balance case, we accumulated both load * values in the one of the siblings cpu_irq[], * to use the same code for physical and logical processors * as much as possible. * * NOTE: the cpu_irq[] array holds the sum of the load for * sibling A and sibling B in the slot for the lowest numbered * sibling (A), _AND_ the load for sibling B in the slot for * the higher numbered sibling. * * We seek the least loaded sibling by making the comparison * (A+B)/2 vs B */ load = CPU_IRQ(min_loaded) >> 1; for_each_cpu_mask(j, per_cpu(cpu_sibling_map, min_loaded)) { if (load > CPU_IRQ(j)) { /* This won't change cpu_sibling_map[min_loaded] */ load = CPU_IRQ(j); min_loaded = j; } } cpus_and(allowed_mask, cpu_online_map, balance_irq_affinity[selected_irq]); target_cpu_mask = cpumask_of_cpu(min_loaded); cpus_and(tmp, target_cpu_mask, allowed_mask); if (!cpus_empty(tmp)) { /* mark for change destination */ set_pending_irq(selected_irq, cpumask_of_cpu(min_loaded)); /* Since we made a change, come back sooner to * check for more variation. */ balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL, balanced_irq_interval - BALANCED_IRQ_LESS_DELTA); return; } goto tryanotherirq; not_worth_the_effort: /* * if we did not find an IRQ to move, then adjust the time interval * upward */ balanced_irq_interval = min((long)MAX_BALANCED_IRQ_INTERVAL, balanced_irq_interval + BALANCED_IRQ_MORE_DELTA); return; } static int balanced_irq(void *unused) { int i; unsigned long prev_balance_time = jiffies; long time_remaining = balanced_irq_interval; /* push everything to CPU 0 to give us a starting point. */ for (i = 0 ; i < NR_IRQS ; i++) { irq_desc[i].pending_mask = cpumask_of_cpu(0); set_pending_irq(i, cpumask_of_cpu(0)); } set_freezable(); for ( ; ; ) { time_remaining = schedule_timeout_interruptible(time_remaining); try_to_freeze(); if (time_after(jiffies, prev_balance_time+balanced_irq_interval)) { preempt_disable(); do_irq_balance(); prev_balance_time = jiffies; time_remaining = balanced_irq_interval; preempt_enable(); } } return 0; } static int __init balanced_irq_init(void) { int i; struct cpuinfo_x86 *c; cpumask_t tmp; cpus_shift_right(tmp, cpu_online_map, 2); c = &boot_cpu_data; /* When not overwritten by the command line ask subarchitecture. */ if (irqbalance_disabled == IRQBALANCE_CHECK_ARCH) irqbalance_disabled = NO_BALANCE_IRQ; if (irqbalance_disabled) return 0; /* disable irqbalance completely if there is only one processor online */ if (num_online_cpus() < 2) { irqbalance_disabled = 1; return 0; } /* * Enable physical balance only if more than 1 physical processor * is present */ if (smp_num_siblings > 1 && !cpus_empty(tmp)) physical_balance = 1; for_each_online_cpu(i) { irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL); irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL); if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) { printk(KERN_ERR "balanced_irq_init: out of memory"); goto failed; } memset(irq_cpu_data[i].irq_delta,0,sizeof(unsigned long) * NR_IRQS); memset(irq_cpu_data[i].last_irq,0,sizeof(unsigned long) * NR_IRQS); } printk(KERN_INFO "Starting balanced_irq\n"); if (!IS_ERR(kthread_run(balanced_irq, NULL, "kirqd"))) return 0; printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq"); failed: for_each_possible_cpu(i) { kfree(irq_cpu_data[i].irq_delta); irq_cpu_data[i].irq_delta = NULL; kfree(irq_cpu_data[i].last_irq); irq_cpu_data[i].last_irq = NULL; } return 0; } int __devinit irqbalance_disable(char *str) { irqbalance_disabled = 1; return 1; } __setup("noirqbalance", irqbalance_disable); late_initcall(balanced_irq_init); #endif /* CONFIG_IRQBALANCE */ #endif /* CONFIG_SMP */ #ifndef CONFIG_SMP void send_IPI_self(int vector) { unsigned int cfg; /* * Wait for idle. */ apic_wait_icr_idle(); cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL; /* * Send the IPI. The write to APIC_ICR fires this off. */ apic_write_around(APIC_ICR, cfg); } #endif /* !CONFIG_SMP */ /* * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to * specific CPU-side IRQs. */ #define MAX_PIRQS 8 static int pirq_entries [MAX_PIRQS]; static int pirqs_enabled; int skip_ioapic_setup; static int __init ioapic_pirq_setup(char *str) { int i, max; int ints[MAX_PIRQS+1]; get_options(str, ARRAY_SIZE(ints), ints); for (i = 0; i < MAX_PIRQS; i++) pirq_entries[i] = -1; pirqs_enabled = 1; apic_printk(APIC_VERBOSE, KERN_INFO "PIRQ redirection, working around broken MP-BIOS.\n"); max = MAX_PIRQS; if (ints[0] < MAX_PIRQS) max = ints[0]; for (i = 0; i < max; i++) { apic_printk(APIC_VERBOSE, KERN_DEBUG "... PIRQ%d -> IRQ %d\n", i, ints[i+1]); /* * PIRQs are mapped upside down, usually. */ pirq_entries[MAX_PIRQS-i-1] = ints[i+1]; } return 1; } __setup("pirq=", ioapic_pirq_setup); /* * Find the IRQ entry number of a certain pin. */ static int find_irq_entry(int apic, int pin, int type) { int i; for (i = 0; i < mp_irq_entries; i++) if (mp_irqs[i].mp_irqtype == type && (mp_irqs[i].mp_dstapic == mp_ioapics[apic].mp_apicid || mp_irqs[i].mp_dstapic == MP_APIC_ALL) && mp_irqs[i].mp_dstirq == pin) return i; return -1; } /* * Find the pin to which IRQ[irq] (ISA) is connected */ static int __init find_isa_irq_pin(int irq, int type) { int i; for (i = 0; i < mp_irq_entries; i++) { int lbus = mp_irqs[i].mp_srcbus; if (test_bit(lbus, mp_bus_not_pci) && (mp_irqs[i].mp_irqtype == type) && (mp_irqs[i].mp_srcbusirq == irq)) return mp_irqs[i].mp_dstirq; } return -1; } static int __init find_isa_irq_apic(int irq, int type) { int i; for (i = 0; i < mp_irq_entries; i++) { int lbus = mp_irqs[i].mp_srcbus; if (test_bit(lbus, mp_bus_not_pci) && (mp_irqs[i].mp_irqtype == type) && (mp_irqs[i].mp_srcbusirq == irq)) break; } if (i < mp_irq_entries) { int apic; for(apic = 0; apic < nr_ioapics; apic++) { if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic) return apic; } } return -1; } /* * Find a specific PCI IRQ entry. * Not an __init, possibly needed by modules */ static int pin_2_irq(int idx, int apic, int pin); int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin) { int apic, i, best_guess = -1; apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, " "slot:%d, pin:%d.\n", bus, slot, pin); if (test_bit(bus, mp_bus_not_pci)) { printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus); return -1; } for (i = 0; i < mp_irq_entries; i++) { int lbus = mp_irqs[i].mp_srcbus; for (apic = 0; apic < nr_ioapics; apic++) if (mp_ioapics[apic].mp_apicid == mp_irqs[i].mp_dstapic || mp_irqs[i].mp_dstapic == MP_APIC_ALL) break; if (!test_bit(lbus, mp_bus_not_pci) && !mp_irqs[i].mp_irqtype && (bus == lbus) && (slot == ((mp_irqs[i].mp_srcbusirq >> 2) & 0x1f))) { int irq = pin_2_irq(i,apic,mp_irqs[i].mp_dstirq); if (!(apic || IO_APIC_IRQ(irq))) continue; if (pin == (mp_irqs[i].mp_srcbusirq & 3)) return irq; /* * Use the first all-but-pin matching entry as a * best-guess fuzzy result for broken mptables. */ if (best_guess < 0) best_guess = irq; } } return best_guess; } EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector); /* * This function currently is only a helper for the i386 smp boot process where * we need to reprogram the ioredtbls to cater for the cpus which have come online * so mask in all cases should simply be TARGET_CPUS */ #ifdef CONFIG_SMP void __init setup_ioapic_dest(void) { int pin, ioapic, irq, irq_entry; if (skip_ioapic_setup == 1) return; for (ioapic = 0; ioapic < nr_ioapics; ioapic++) { for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) { irq_entry = find_irq_entry(ioapic, pin, mp_INT); if (irq_entry == -1) continue; irq = pin_2_irq(irq_entry, ioapic, pin); set_ioapic_affinity_irq(irq, TARGET_CPUS); } } } #endif #if defined(CONFIG_EISA) || defined(CONFIG_MCA) /* * EISA Edge/Level control register, ELCR */ static int EISA_ELCR(unsigned int irq) { if (irq < 16) { unsigned int port = 0x4d0 + (irq >> 3); return (inb(port) >> (irq & 7)) & 1; } apic_printk(APIC_VERBOSE, KERN_INFO "Broken MPtable reports ISA irq %d\n", irq); return 0; } #endif /* ISA interrupts are always polarity zero edge triggered, * when listed as conforming in the MP table. */ #define default_ISA_trigger(idx) (0) #define default_ISA_polarity(idx) (0) /* EISA interrupts are always polarity zero and can be edge or level * trigger depending on the ELCR value. If an interrupt is listed as * EISA conforming in the MP table, that means its trigger type must * be read in from the ELCR */ #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mp_srcbusirq)) #define default_EISA_polarity(idx) default_ISA_polarity(idx) /* PCI interrupts are always polarity one level triggered, * when listed as conforming in the MP table. */ #define default_PCI_trigger(idx) (1) #define default_PCI_polarity(idx) (1) /* MCA interrupts are always polarity zero level triggered, * when listed as conforming in the MP table. */ #define default_MCA_trigger(idx) (1) #define default_MCA_polarity(idx) default_ISA_polarity(idx) static int MPBIOS_polarity(int idx) { int bus = mp_irqs[idx].mp_srcbus; int polarity; /* * Determine IRQ line polarity (high active or low active): */ switch (mp_irqs[idx].mp_irqflag & 3) { case 0: /* conforms, ie. bus-type dependent polarity */ { polarity = test_bit(bus, mp_bus_not_pci)? default_ISA_polarity(idx): default_PCI_polarity(idx); break; } case 1: /* high active */ { polarity = 0; break; } case 2: /* reserved */ { printk(KERN_WARNING "broken BIOS!!\n"); polarity = 1; break; } case 3: /* low active */ { polarity = 1; break; } default: /* invalid */ { printk(KERN_WARNING "broken BIOS!!\n"); polarity = 1; break; } } return polarity; } static int MPBIOS_trigger(int idx) { int bus = mp_irqs[idx].mp_srcbus; int trigger; /* * Determine IRQ trigger mode (edge or level sensitive): */ switch ((mp_irqs[idx].mp_irqflag>>2) & 3) { case 0: /* conforms, ie. bus-type dependent */ { trigger = test_bit(bus, mp_bus_not_pci)? default_ISA_trigger(idx): default_PCI_trigger(idx); #if defined(CONFIG_EISA) || defined(CONFIG_MCA) switch (mp_bus_id_to_type[bus]) { case MP_BUS_ISA: /* ISA pin */ { /* set before the switch */ break; } case MP_BUS_EISA: /* EISA pin */ { trigger = default_EISA_trigger(idx); break; } case MP_BUS_PCI: /* PCI pin */ { /* set before the switch */ break; } case MP_BUS_MCA: /* MCA pin */ { trigger = default_MCA_trigger(idx); break; } default: { printk(KERN_WARNING "broken BIOS!!\n"); trigger = 1; break; } } #endif break; } case 1: /* edge */ { trigger = 0; break; } case 2: /* reserved */ { printk(KERN_WARNING "broken BIOS!!\n"); trigger = 1; break; } case 3: /* level */ { trigger = 1; break; } default: /* invalid */ { printk(KERN_WARNING "broken BIOS!!\n"); trigger = 0; break; } } return trigger; } static inline int irq_polarity(int idx) { return MPBIOS_polarity(idx); } static inline int irq_trigger(int idx) { return MPBIOS_trigger(idx); } static int pin_2_irq(int idx, int apic, int pin) { int irq, i; int bus = mp_irqs[idx].mp_srcbus; /* * Debugging check, we are in big trouble if this message pops up! */ if (mp_irqs[idx].mp_dstirq != pin) printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n"); if (test_bit(bus, mp_bus_not_pci)) irq = mp_irqs[idx].mp_srcbusirq; else { /* * PCI IRQs are mapped in order */ i = irq = 0; while (i < apic) irq += nr_ioapic_registers[i++]; irq += pin; /* * For MPS mode, so far only needed by ES7000 platform */ if (ioapic_renumber_irq) irq = ioapic_renumber_irq(apic, irq); } /* * PCI IRQ command line redirection. Yes, limits are hardcoded. */ if ((pin >= 16) && (pin <= 23)) { if (pirq_entries[pin-16] != -1) { if (!pirq_entries[pin-16]) { apic_printk(APIC_VERBOSE, KERN_DEBUG "disabling PIRQ%d\n", pin-16); } else { irq = pirq_entries[pin-16]; apic_printk(APIC_VERBOSE, KERN_DEBUG "using PIRQ%d -> IRQ %d\n", pin-16, irq); } } } return irq; } static inline int IO_APIC_irq_trigger(int irq) { int apic, idx, pin; for (apic = 0; apic < nr_ioapics; apic++) { for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { idx = find_irq_entry(apic,pin,mp_INT); if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin))) return irq_trigger(idx); } } /* * nonexistent IRQs are edge default */ return 0; } /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */ static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 }; static int __assign_irq_vector(int irq) { static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0; int vector, offset; BUG_ON((unsigned)irq >= NR_IRQ_VECTORS); if (irq_vector[irq] > 0) return irq_vector[irq]; vector = current_vector; offset = current_offset; next: vector += 8; if (vector >= FIRST_SYSTEM_VECTOR) { offset = (offset + 1) % 8; vector = FIRST_DEVICE_VECTOR + offset; } if (vector == current_vector) return -ENOSPC; if (test_and_set_bit(vector, used_vectors)) goto next; current_vector = vector; current_offset = offset; irq_vector[irq] = vector; return vector; } static int assign_irq_vector(int irq) { unsigned long flags; int vector; spin_lock_irqsave(&vector_lock, flags); vector = __assign_irq_vector(irq); spin_unlock_irqrestore(&vector_lock, flags); return vector; } static struct irq_chip ioapic_chip; #define IOAPIC_AUTO -1 #define IOAPIC_EDGE 0 #define IOAPIC_LEVEL 1 static void ioapic_register_intr(int irq, int vector, unsigned long trigger) { if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) || trigger == IOAPIC_LEVEL) { irq_desc[irq].status |= IRQ_LEVEL; set_irq_chip_and_handler_name(irq, &ioapic_chip, handle_fasteoi_irq, "fasteoi"); } else { irq_desc[irq].status &= ~IRQ_LEVEL; set_irq_chip_and_handler_name(irq, &ioapic_chip, handle_edge_irq, "edge"); } set_intr_gate(vector, interrupt[irq]); } static void __init setup_IO_APIC_irqs(void) { struct IO_APIC_route_entry entry; int apic, pin, idx, irq, first_notcon = 1, vector; apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n"); for (apic = 0; apic < nr_ioapics; apic++) { for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { /* * add it to the IO-APIC irq-routing table: */ memset(&entry,0,sizeof(entry)); entry.delivery_mode = INT_DELIVERY_MODE; entry.dest_mode = INT_DEST_MODE; entry.mask = 0; /* enable IRQ */ entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); idx = find_irq_entry(apic,pin,mp_INT); if (idx == -1) { if (first_notcon) { apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mp_apicid, pin); first_notcon = 0; } else apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mp_apicid, pin); continue; } if (!first_notcon) { apic_printk(APIC_VERBOSE, " not connected.\n"); first_notcon = 1; } entry.trigger = irq_trigger(idx); entry.polarity = irq_polarity(idx); if (irq_trigger(idx)) { entry.trigger = 1; entry.mask = 1; } irq = pin_2_irq(idx, apic, pin); /* * skip adding the timer int on secondary nodes, which causes * a small but painful rift in the time-space continuum */ if (multi_timer_check(apic, irq)) continue; else add_pin_to_irq(irq, apic, pin); if (!apic && !IO_APIC_IRQ(irq)) continue; if (IO_APIC_IRQ(irq)) { vector = assign_irq_vector(irq); entry.vector = vector; ioapic_register_intr(irq, vector, IOAPIC_AUTO); if (!apic && (irq < 16)) disable_8259A_irq(irq); } ioapic_write_entry(apic, pin, entry); } } if (!first_notcon) apic_printk(APIC_VERBOSE, " not connected.\n"); } /* * Set up the 8259A-master output pin: */ static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector) { struct IO_APIC_route_entry entry; memset(&entry,0,sizeof(entry)); disable_8259A_irq(0); /* mask LVT0 */ apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); /* * We use logical delivery to get the timer IRQ * to the first CPU. */ entry.dest_mode = INT_DEST_MODE; entry.mask = 0; /* unmask IRQ now */ entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); entry.delivery_mode = INT_DELIVERY_MODE; entry.polarity = 0; entry.trigger = 0; entry.vector = vector; /* * The timer IRQ doesn't have to know that behind the * scene we have a 8259A-master in AEOI mode ... */ irq_desc[0].chip = &ioapic_chip; set_irq_handler(0, handle_edge_irq); /* * Add it to the IO-APIC irq-routing table: */ ioapic_write_entry(apic, pin, entry); enable_8259A_irq(0); } void __init print_IO_APIC(void) { int apic, i; union IO_APIC_reg_00 reg_00; union IO_APIC_reg_01 reg_01; union IO_APIC_reg_02 reg_02; union IO_APIC_reg_03 reg_03; unsigned long flags; if (apic_verbosity == APIC_QUIET) return; printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries); for (i = 0; i < nr_ioapics; i++) printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n", mp_ioapics[i].mp_apicid, nr_ioapic_registers[i]); /* * We are a bit conservative about what we expect. We have to * know about every hardware change ASAP. */ printk(KERN_INFO "testing the IO APIC.......................\n"); for (apic = 0; apic < nr_ioapics; apic++) { spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(apic, 0); reg_01.raw = io_apic_read(apic, 1); if (reg_01.bits.version >= 0x10) reg_02.raw = io_apic_read(apic, 2); if (reg_01.bits.version >= 0x20) reg_03.raw = io_apic_read(apic, 3); spin_unlock_irqrestore(&ioapic_lock, flags); printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mp_apicid); printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw); printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID); printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type); printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS); printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw); printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries); printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ); printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version); /* * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02, * but the value of reg_02 is read as the previous read register * value, so ignore it if reg_02 == reg_01. */ if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) { printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw); printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration); } /* * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02 * or reg_03, but the value of reg_0[23] is read as the previous read * register value, so ignore it if reg_03 == reg_0[12]. */ if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw && reg_03.raw != reg_01.raw) { printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw); printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT); } printk(KERN_DEBUG ".... IRQ redirection table:\n"); printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol" " Stat Dest Deli Vect: \n"); for (i = 0; i <= reg_01.bits.entries; i++) { struct IO_APIC_route_entry entry; entry = ioapic_read_entry(apic, i); printk(KERN_DEBUG " %02x %03X %02X ", i, entry.dest.logical.logical_dest, entry.dest.physical.physical_dest ); printk("%1d %1d %1d %1d %1d %1d %1d %02X\n", entry.mask, entry.trigger, entry.irr, entry.polarity, entry.delivery_status, entry.dest_mode, entry.delivery_mode, entry.vector ); } } printk(KERN_DEBUG "IRQ to pin mappings:\n"); for (i = 0; i < NR_IRQS; i++) { struct irq_pin_list *entry = irq_2_pin + i; if (entry->pin < 0) continue; printk(KERN_DEBUG "IRQ%d ", i); for (;;) { printk("-> %d:%d", entry->apic, entry->pin); if (!entry->next) break; entry = irq_2_pin + entry->next; } printk("\n"); } printk(KERN_INFO ".................................... done.\n"); return; } #if 0 static void print_APIC_bitfield (int base) { unsigned int v; int i, j; if (apic_verbosity == APIC_QUIET) return; printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG); for (i = 0; i < 8; i++) { v = apic_read(base + i*0x10); for (j = 0; j < 32; j++) { if (v & (1< 3) /* Due to the Pentium erratum 3AP. */ apic_write(APIC_ESR, 0); v = apic_read(APIC_ESR); printk(KERN_DEBUG "... APIC ESR: %08x\n", v); } v = apic_read(APIC_ICR); printk(KERN_DEBUG "... APIC ICR: %08x\n", v); v = apic_read(APIC_ICR2); printk(KERN_DEBUG "... APIC ICR2: %08x\n", v); v = apic_read(APIC_LVTT); printk(KERN_DEBUG "... APIC LVTT: %08x\n", v); if (maxlvt > 3) { /* PC is LVT#4. */ v = apic_read(APIC_LVTPC); printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v); } v = apic_read(APIC_LVT0); printk(KERN_DEBUG "... APIC LVT0: %08x\n", v); v = apic_read(APIC_LVT1); printk(KERN_DEBUG "... APIC LVT1: %08x\n", v); if (maxlvt > 2) { /* ERR is LVT#3. */ v = apic_read(APIC_LVTERR); printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v); } v = apic_read(APIC_TMICT); printk(KERN_DEBUG "... APIC TMICT: %08x\n", v); v = apic_read(APIC_TMCCT); printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v); v = apic_read(APIC_TDCR); printk(KERN_DEBUG "... APIC TDCR: %08x\n", v); printk("\n"); } void print_all_local_APICs (void) { on_each_cpu(print_local_APIC, NULL, 1, 1); } void /*__init*/ print_PIC(void) { unsigned int v; unsigned long flags; if (apic_verbosity == APIC_QUIET) return; printk(KERN_DEBUG "\nprinting PIC contents\n"); spin_lock_irqsave(&i8259A_lock, flags); v = inb(0xa1) << 8 | inb(0x21); printk(KERN_DEBUG "... PIC IMR: %04x\n", v); v = inb(0xa0) << 8 | inb(0x20); printk(KERN_DEBUG "... PIC IRR: %04x\n", v); outb(0x0b,0xa0); outb(0x0b,0x20); v = inb(0xa0) << 8 | inb(0x20); outb(0x0a,0xa0); outb(0x0a,0x20); spin_unlock_irqrestore(&i8259A_lock, flags); printk(KERN_DEBUG "... PIC ISR: %04x\n", v); v = inb(0x4d1) << 8 | inb(0x4d0); printk(KERN_DEBUG "... PIC ELCR: %04x\n", v); } #endif /* 0 */ static void __init enable_IO_APIC(void) { union IO_APIC_reg_01 reg_01; int i8259_apic, i8259_pin; int i, apic; unsigned long flags; for (i = 0; i < PIN_MAP_SIZE; i++) { irq_2_pin[i].pin = -1; irq_2_pin[i].next = 0; } if (!pirqs_enabled) for (i = 0; i < MAX_PIRQS; i++) pirq_entries[i] = -1; /* * The number of IO-APIC IRQ registers (== #pins): */ for (apic = 0; apic < nr_ioapics; apic++) { spin_lock_irqsave(&ioapic_lock, flags); reg_01.raw = io_apic_read(apic, 1); spin_unlock_irqrestore(&ioapic_lock, flags); nr_ioapic_registers[apic] = reg_01.bits.entries+1; } for(apic = 0; apic < nr_ioapics; apic++) { int pin; /* See if any of the pins is in ExtINT mode */ for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) { struct IO_APIC_route_entry entry; entry = ioapic_read_entry(apic, pin); /* If the interrupt line is enabled and in ExtInt mode * I have found the pin where the i8259 is connected. */ if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) { ioapic_i8259.apic = apic; ioapic_i8259.pin = pin; goto found_i8259; } } } found_i8259: /* Look to see what if the MP table has reported the ExtINT */ /* If we could not find the appropriate pin by looking at the ioapic * the i8259 probably is not connected the ioapic but give the * mptable a chance anyway. */ i8259_pin = find_isa_irq_pin(0, mp_ExtINT); i8259_apic = find_isa_irq_apic(0, mp_ExtINT); /* Trust the MP table if nothing is setup in the hardware */ if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) { printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n"); ioapic_i8259.pin = i8259_pin; ioapic_i8259.apic = i8259_apic; } /* Complain if the MP table and the hardware disagree */ if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) && (i8259_pin >= 0) && (ioapic_i8259.pin >= 0)) { printk(KERN_WARNING "ExtINT in hardware and MP table differ\n"); } /* * Do not trust the IO-APIC being empty at bootup */ clear_IO_APIC(); } /* * Not an __init, needed by the reboot code */ void disable_IO_APIC(void) { /* * Clear the IO-APIC before rebooting: */ clear_IO_APIC(); /* * If the i8259 is routed through an IOAPIC * Put that IOAPIC in virtual wire mode * so legacy interrupts can be delivered. */ if (ioapic_i8259.pin != -1) { struct IO_APIC_route_entry entry; memset(&entry, 0, sizeof(entry)); entry.mask = 0; /* Enabled */ entry.trigger = 0; /* Edge */ entry.irr = 0; entry.polarity = 0; /* High */ entry.delivery_status = 0; entry.dest_mode = 0; /* Physical */ entry.delivery_mode = dest_ExtINT; /* ExtInt */ entry.vector = 0; entry.dest.physical.physical_dest = GET_APIC_ID(read_apic_id()); /* * Add it to the IO-APIC irq-routing table: */ ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry); } disconnect_bsp_APIC(ioapic_i8259.pin != -1); } /* * function to set the IO-APIC physical IDs based on the * values stored in the MPC table. * * by Matt Domsch Tue Dec 21 12:25:05 CST 1999 */ static void __init setup_ioapic_ids_from_mpc(void) { union IO_APIC_reg_00 reg_00; physid_mask_t phys_id_present_map; int apic; int i; unsigned char old_id; unsigned long flags; #ifdef CONFIG_X86_NUMAQ if (found_numaq) return; #endif /* * Don't check I/O APIC IDs for xAPIC systems. They have * no meaning without the serial APIC bus. */ if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) || APIC_XAPIC(apic_version[boot_cpu_physical_apicid])) return; /* * This is broken; anything with a real cpu count has to * circumvent this idiocy regardless. */ phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map); /* * Set the IOAPIC ID to the value stored in the MPC table. */ for (apic = 0; apic < nr_ioapics; apic++) { /* Read the register 0 value */ spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(apic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); old_id = mp_ioapics[apic].mp_apicid; if (mp_ioapics[apic].mp_apicid >= get_physical_broadcast()) { printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n", apic, mp_ioapics[apic].mp_apicid); printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n", reg_00.bits.ID); mp_ioapics[apic].mp_apicid = reg_00.bits.ID; } /* * Sanity check, is the ID really free? Every APIC in a * system must have a unique ID or we get lots of nice * 'stuck on smp_invalidate_needed IPI wait' messages. */ if (check_apicid_used(phys_id_present_map, mp_ioapics[apic].mp_apicid)) { printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n", apic, mp_ioapics[apic].mp_apicid); for (i = 0; i < get_physical_broadcast(); i++) if (!physid_isset(i, phys_id_present_map)) break; if (i >= get_physical_broadcast()) panic("Max APIC ID exceeded!\n"); printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n", i); physid_set(i, phys_id_present_map); mp_ioapics[apic].mp_apicid = i; } else { physid_mask_t tmp; tmp = apicid_to_cpu_present(mp_ioapics[apic].mp_apicid); apic_printk(APIC_VERBOSE, "Setting %d in the " "phys_id_present_map\n", mp_ioapics[apic].mp_apicid); physids_or(phys_id_present_map, phys_id_present_map, tmp); } /* * We need to adjust the IRQ routing table * if the ID changed. */ if (old_id != mp_ioapics[apic].mp_apicid) for (i = 0; i < mp_irq_entries; i++) if (mp_irqs[i].mp_dstapic == old_id) mp_irqs[i].mp_dstapic = mp_ioapics[apic].mp_apicid; /* * Read the right value from the MPC table and * write it into the ID register. */ apic_printk(APIC_VERBOSE, KERN_INFO "...changing IO-APIC physical APIC ID to %d ...", mp_ioapics[apic].mp_apicid); reg_00.bits.ID = mp_ioapics[apic].mp_apicid; spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(apic, 0, reg_00.raw); spin_unlock_irqrestore(&ioapic_lock, flags); /* * Sanity check */ spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(apic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); if (reg_00.bits.ID != mp_ioapics[apic].mp_apicid) printk("could not set ID!\n"); else apic_printk(APIC_VERBOSE, " ok.\n"); } } int no_timer_check __initdata; static int __init notimercheck(char *s) { no_timer_check = 1; return 1; } __setup("no_timer_check", notimercheck); /* * There is a nasty bug in some older SMP boards, their mptable lies * about the timer IRQ. We do the following to work around the situation: * * - timer IRQ defaults to IO-APIC IRQ * - if this function detects that timer IRQs are defunct, then we fall * back to ISA timer IRQs */ static int __init timer_irq_works(void) { unsigned long t1 = jiffies; unsigned long flags; if (no_timer_check) return 1; local_save_flags(flags); local_irq_enable(); /* Let ten ticks pass... */ mdelay((10 * 1000) / HZ); local_irq_restore(flags); /* * Expect a few ticks at least, to be sure some possible * glue logic does not lock up after one or two first * ticks in a non-ExtINT mode. Also the local APIC * might have cached one ExtINT interrupt. Finally, at * least one tick may be lost due to delays. */ if (time_after(jiffies, t1 + 4)) return 1; return 0; } /* * In the SMP+IOAPIC case it might happen that there are an unspecified * number of pending IRQ events unhandled. These cases are very rare, * so we 'resend' these IRQs via IPIs, to the same CPU. It's much * better to do it this way as thus we do not have to be aware of * 'pending' interrupts in the IRQ path, except at this point. */ /* * Edge triggered needs to resend any interrupt * that was delayed but this is now handled in the device * independent code. */ /* * Startup quirk: * * Starting up a edge-triggered IO-APIC interrupt is * nasty - we need to make sure that we get the edge. * If it is already asserted for some reason, we need * return 1 to indicate that is was pending. * * This is not complete - we should be able to fake * an edge even if it isn't on the 8259A... * * (We do this for level-triggered IRQs too - it cannot hurt.) */ static unsigned int startup_ioapic_irq(unsigned int irq) { int was_pending = 0; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); if (irq < 16) { disable_8259A_irq(irq); if (i8259A_irq_pending(irq)) was_pending = 1; } __unmask_IO_APIC_irq(irq); spin_unlock_irqrestore(&ioapic_lock, flags); return was_pending; } static void ack_ioapic_irq(unsigned int irq) { move_native_irq(irq); ack_APIC_irq(); } static void ack_ioapic_quirk_irq(unsigned int irq) { unsigned long v; int i; move_native_irq(irq); /* * It appears there is an erratum which affects at least version 0x11 * of I/O APIC (that's the 82093AA and cores integrated into various * chipsets). Under certain conditions a level-triggered interrupt is * erroneously delivered as edge-triggered one but the respective IRR * bit gets set nevertheless. As a result the I/O unit expects an EOI * message but it will never arrive and further interrupts are blocked * from the source. The exact reason is so far unknown, but the * phenomenon was observed when two consecutive interrupt requests * from a given source get delivered to the same CPU and the source is * temporarily disabled in between. * * A workaround is to simulate an EOI message manually. We achieve it * by setting the trigger mode to edge and then to level when the edge * trigger mode gets detected in the TMR of a local APIC for a * level-triggered interrupt. We mask the source for the time of the * operation to prevent an edge-triggered interrupt escaping meanwhile. * The idea is from Manfred Spraul. --macro */ i = irq_vector[irq]; v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1)); ack_APIC_irq(); if (!(v & (1 << (i & 0x1f)))) { atomic_inc(&irq_mis_count); spin_lock(&ioapic_lock); __mask_and_edge_IO_APIC_irq(irq); __unmask_and_level_IO_APIC_irq(irq); spin_unlock(&ioapic_lock); } } static int ioapic_retrigger_irq(unsigned int irq) { send_IPI_self(irq_vector[irq]); return 1; } static struct irq_chip ioapic_chip __read_mostly = { .name = "IO-APIC", .startup = startup_ioapic_irq, .mask = mask_IO_APIC_irq, .unmask = unmask_IO_APIC_irq, .ack = ack_ioapic_irq, .eoi = ack_ioapic_quirk_irq, #ifdef CONFIG_SMP .set_affinity = set_ioapic_affinity_irq, #endif .retrigger = ioapic_retrigger_irq, }; static inline void init_IO_APIC_traps(void) { int irq; /* * NOTE! The local APIC isn't very good at handling * multiple interrupts at the same interrupt level. * As the interrupt level is determined by taking the * vector number and shifting that right by 4, we * want to spread these out a bit so that they don't * all fall in the same interrupt level. * * Also, we've got to be careful not to trash gate * 0x80, because int 0x80 is hm, kind of importantish. ;) */ for (irq = 0; irq < NR_IRQS ; irq++) { if (IO_APIC_IRQ(irq) && !irq_vector[irq]) { /* * Hmm.. We don't have an entry for this, * so default to an old-fashioned 8259 * interrupt if we can.. */ if (irq < 16) make_8259A_irq(irq); else /* Strange. Oh, well.. */ irq_desc[irq].chip = &no_irq_chip; } } } /* * The local APIC irq-chip implementation: */ static void ack_apic(unsigned int irq) { ack_APIC_irq(); } static void mask_lapic_irq (unsigned int irq) { unsigned long v; v = apic_read(APIC_LVT0); apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED); } static void unmask_lapic_irq (unsigned int irq) { unsigned long v; v = apic_read(APIC_LVT0); apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED); } static struct irq_chip lapic_chip __read_mostly = { .name = "local-APIC-edge", .mask = mask_lapic_irq, .unmask = unmask_lapic_irq, .eoi = ack_apic, }; static void __init setup_nmi(void) { /* * Dirty trick to enable the NMI watchdog ... * We put the 8259A master into AEOI mode and * unmask on all local APICs LVT0 as NMI. * * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire') * is from Maciej W. Rozycki - so we do not have to EOI from * the NMI handler or the timer interrupt. */ apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ..."); enable_NMI_through_LVT0(); apic_printk(APIC_VERBOSE, " done.\n"); } /* * This looks a bit hackish but it's about the only one way of sending * a few INTA cycles to 8259As and any associated glue logic. ICR does * not support the ExtINT mode, unfortunately. We need to send these * cycles as some i82489DX-based boards have glue logic that keeps the * 8259A interrupt line asserted until INTA. --macro */ static inline void __init unlock_ExtINT_logic(void) { int apic, pin, i; struct IO_APIC_route_entry entry0, entry1; unsigned char save_control, save_freq_select; pin = find_isa_irq_pin(8, mp_INT); if (pin == -1) { WARN_ON_ONCE(1); return; } apic = find_isa_irq_apic(8, mp_INT); if (apic == -1) { WARN_ON_ONCE(1); return; } entry0 = ioapic_read_entry(apic, pin); clear_IO_APIC_pin(apic, pin); memset(&entry1, 0, sizeof(entry1)); entry1.dest_mode = 0; /* physical delivery */ entry1.mask = 0; /* unmask IRQ now */ entry1.dest.physical.physical_dest = hard_smp_processor_id(); entry1.delivery_mode = dest_ExtINT; entry1.polarity = entry0.polarity; entry1.trigger = 0; entry1.vector = 0; ioapic_write_entry(apic, pin, entry1); save_control = CMOS_READ(RTC_CONTROL); save_freq_select = CMOS_READ(RTC_FREQ_SELECT); CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6, RTC_FREQ_SELECT); CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL); i = 100; while (i-- > 0) { mdelay(10); if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF) i -= 10; } CMOS_WRITE(save_control, RTC_CONTROL); CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); clear_IO_APIC_pin(apic, pin); ioapic_write_entry(apic, pin, entry0); } /* * This code may look a bit paranoid, but it's supposed to cooperate with * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ * is so screwy. Thanks to Brian Perkins for testing/hacking this beast * fanatically on his truly buggy board. */ static inline void __init check_timer(void) { int apic1, pin1, apic2, pin2; int vector; unsigned int ver; unsigned long flags; local_irq_save(flags); ver = apic_read(APIC_LVR); ver = GET_APIC_VERSION(ver); /* * get/set the timer IRQ vector: */ disable_8259A_irq(0); vector = assign_irq_vector(0); set_intr_gate(vector, interrupt[0]); /* * Subtle, code in do_timer_interrupt() expects an AEOI * mode for the 8259A whenever interrupts are routed * through I/O APICs. Also IRQ0 has to be enabled in * the 8259A which implies the virtual wire has to be * disabled in the local APIC. Finally timer interrupts * need to be acknowledged manually in the 8259A for * timer_interrupt() and for the i82489DX when using * the NMI watchdog. */ apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); init_8259A(1); timer_ack = !cpu_has_tsc; timer_ack |= (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver)); if (timer_over_8254 > 0) enable_8259A_irq(0); pin1 = find_isa_irq_pin(0, mp_INT); apic1 = find_isa_irq_apic(0, mp_INT); pin2 = ioapic_i8259.pin; apic2 = ioapic_i8259.apic; printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n", vector, apic1, pin1, apic2, pin2); if (pin1 != -1) { /* * Ok, does IRQ0 through the IOAPIC work? */ unmask_IO_APIC_irq(0); if (timer_irq_works()) { if (nmi_watchdog == NMI_IO_APIC) { disable_8259A_irq(0); setup_nmi(); enable_8259A_irq(0); } if (disable_timer_pin_1 > 0) clear_IO_APIC_pin(0, pin1); goto out; } clear_IO_APIC_pin(apic1, pin1); printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to " "IO-APIC\n"); } printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... "); if (pin2 != -1) { printk("\n..... (found pin %d) ...", pin2); /* * legacy devices should be connected to IO APIC #0 */ setup_ExtINT_IRQ0_pin(apic2, pin2, vector); if (timer_irq_works()) { printk("works.\n"); if (pin1 != -1) replace_pin_at_irq(0, apic1, pin1, apic2, pin2); else add_pin_to_irq(0, apic2, pin2); if (nmi_watchdog == NMI_IO_APIC) { setup_nmi(); } goto out; } /* * Cleanup, just in case ... */ clear_IO_APIC_pin(apic2, pin2); } printk(" failed.\n"); if (nmi_watchdog == NMI_IO_APIC) { printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n"); nmi_watchdog = 0; } printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); disable_8259A_irq(0); set_irq_chip_and_handler_name(0, &lapic_chip, handle_fasteoi_irq, "fasteoi"); apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */ enable_8259A_irq(0); if (timer_irq_works()) { printk(" works.\n"); goto out; } apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector); printk(" failed.\n"); printk(KERN_INFO "...trying to set up timer as ExtINT IRQ..."); timer_ack = 0; init_8259A(0); make_8259A_irq(0); apic_write_around(APIC_LVT0, APIC_DM_EXTINT); unlock_ExtINT_logic(); if (timer_irq_works()) { printk(" works.\n"); goto out; } printk(" failed :(.\n"); panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a " "report. Then try booting with the 'noapic' option"); out: local_irq_restore(flags); } /* * * IRQ's that are handled by the PIC in the MPS IOAPIC case. * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ. * Linux doesn't really care, as it's not actually used * for any interrupt handling anyway. */ #define PIC_IRQS (1 << PIC_CASCADE_IR) void __init setup_IO_APIC(void) { int i; /* Reserve all the system vectors. */ for (i = FIRST_SYSTEM_VECTOR; i < NR_VECTORS; i++) set_bit(i, used_vectors); enable_IO_APIC(); if (acpi_ioapic) io_apic_irqs = ~0; /* all IRQs go through IOAPIC */ else io_apic_irqs = ~PIC_IRQS; printk("ENABLING IO-APIC IRQs\n"); /* * Set up IO-APIC IRQ routing. */ if (!acpi_ioapic) setup_ioapic_ids_from_mpc(); sync_Arb_IDs(); setup_IO_APIC_irqs(); init_IO_APIC_traps(); check_timer(); if (!acpi_ioapic) print_IO_APIC(); } static int __init setup_disable_8254_timer(char *s) { timer_over_8254 = -1; return 1; } static int __init setup_enable_8254_timer(char *s) { timer_over_8254 = 2; return 1; } __setup("disable_8254_timer", setup_disable_8254_timer); __setup("enable_8254_timer", setup_enable_8254_timer); /* * Called after all the initialization is done. If we didnt find any * APIC bugs then we can allow the modify fast path */ static int __init io_apic_bug_finalize(void) { if(sis_apic_bug == -1) sis_apic_bug = 0; return 0; } late_initcall(io_apic_bug_finalize); struct sysfs_ioapic_data { struct sys_device dev; struct IO_APIC_route_entry entry[0]; }; static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS]; static int ioapic_suspend(struct sys_device *dev, pm_message_t state) { struct IO_APIC_route_entry *entry; struct sysfs_ioapic_data *data; int i; data = container_of(dev, struct sysfs_ioapic_data, dev); entry = data->entry; for (i = 0; i < nr_ioapic_registers[dev->id]; i ++) entry[i] = ioapic_read_entry(dev->id, i); return 0; } static int ioapic_resume(struct sys_device *dev) { struct IO_APIC_route_entry *entry; struct sysfs_ioapic_data *data; unsigned long flags; union IO_APIC_reg_00 reg_00; int i; data = container_of(dev, struct sysfs_ioapic_data, dev); entry = data->entry; spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(dev->id, 0); if (reg_00.bits.ID != mp_ioapics[dev->id].mp_apicid) { reg_00.bits.ID = mp_ioapics[dev->id].mp_apicid; io_apic_write(dev->id, 0, reg_00.raw); } spin_unlock_irqrestore(&ioapic_lock, flags); for (i = 0; i < nr_ioapic_registers[dev->id]; i ++) ioapic_write_entry(dev->id, i, entry[i]); return 0; } static struct sysdev_class ioapic_sysdev_class = { .name = "ioapic", .suspend = ioapic_suspend, .resume = ioapic_resume, }; static int __init ioapic_init_sysfs(void) { struct sys_device * dev; int i, size, error = 0; error = sysdev_class_register(&ioapic_sysdev_class); if (error) return error; for (i = 0; i < nr_ioapics; i++ ) { size = sizeof(struct sys_device) + nr_ioapic_registers[i] * sizeof(struct IO_APIC_route_entry); mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL); if (!mp_ioapic_data[i]) { printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); continue; } memset(mp_ioapic_data[i], 0, size); dev = &mp_ioapic_data[i]->dev; dev->id = i; dev->cls = &ioapic_sysdev_class; error = sysdev_register(dev); if (error) { kfree(mp_ioapic_data[i]); mp_ioapic_data[i] = NULL; printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i); continue; } } return 0; } device_initcall(ioapic_init_sysfs); /* * Dynamic irq allocate and deallocation */ int create_irq(void) { /* Allocate an unused irq */ int irq, new, vector = 0; unsigned long flags; irq = -ENOSPC; spin_lock_irqsave(&vector_lock, flags); for (new = (NR_IRQS - 1); new >= 0; new--) { if (platform_legacy_irq(new)) continue; if (irq_vector[new] != 0) continue; vector = __assign_irq_vector(new); if (likely(vector > 0)) irq = new; break; } spin_unlock_irqrestore(&vector_lock, flags); if (irq >= 0) { set_intr_gate(vector, interrupt[irq]); dynamic_irq_init(irq); } return irq; } void destroy_irq(unsigned int irq) { unsigned long flags; dynamic_irq_cleanup(irq); spin_lock_irqsave(&vector_lock, flags); clear_bit(irq_vector[irq], used_vectors); irq_vector[irq] = 0; spin_unlock_irqrestore(&vector_lock, flags); } /* * MSI message composition */ #ifdef CONFIG_PCI_MSI static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg) { int vector; unsigned dest; vector = assign_irq_vector(irq); if (vector >= 0) { dest = cpu_mask_to_apicid(TARGET_CPUS); msg->address_hi = MSI_ADDR_BASE_HI; msg->address_lo = MSI_ADDR_BASE_LO | ((INT_DEST_MODE == 0) ? MSI_ADDR_DEST_MODE_PHYSICAL: MSI_ADDR_DEST_MODE_LOGICAL) | ((INT_DELIVERY_MODE != dest_LowestPrio) ? MSI_ADDR_REDIRECTION_CPU: MSI_ADDR_REDIRECTION_LOWPRI) | MSI_ADDR_DEST_ID(dest); msg->data = MSI_DATA_TRIGGER_EDGE | MSI_DATA_LEVEL_ASSERT | ((INT_DELIVERY_MODE != dest_LowestPrio) ? MSI_DATA_DELIVERY_FIXED: MSI_DATA_DELIVERY_LOWPRI) | MSI_DATA_VECTOR(vector); } return vector; } #ifdef CONFIG_SMP static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask) { struct msi_msg msg; unsigned int dest; cpumask_t tmp; int vector; cpus_and(tmp, mask, cpu_online_map); if (cpus_empty(tmp)) tmp = TARGET_CPUS; vector = assign_irq_vector(irq); if (vector < 0) return; dest = cpu_mask_to_apicid(mask); read_msi_msg(irq, &msg); msg.data &= ~MSI_DATA_VECTOR_MASK; msg.data |= MSI_DATA_VECTOR(vector); msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK; msg.address_lo |= MSI_ADDR_DEST_ID(dest); write_msi_msg(irq, &msg); irq_desc[irq].affinity = mask; } #endif /* CONFIG_SMP */ /* * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices, * which implement the MSI or MSI-X Capability Structure. */ static struct irq_chip msi_chip = { .name = "PCI-MSI", .unmask = unmask_msi_irq, .mask = mask_msi_irq, .ack = ack_ioapic_irq, #ifdef CONFIG_SMP .set_affinity = set_msi_irq_affinity, #endif .retrigger = ioapic_retrigger_irq, }; int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) { struct msi_msg msg; int irq, ret; irq = create_irq(); if (irq < 0) return irq; ret = msi_compose_msg(dev, irq, &msg); if (ret < 0) { destroy_irq(irq); return ret; } set_irq_msi(irq, desc); write_msi_msg(irq, &msg); set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge"); return 0; } void arch_teardown_msi_irq(unsigned int irq) { destroy_irq(irq); } #endif /* CONFIG_PCI_MSI */ /* * Hypertransport interrupt support */ #ifdef CONFIG_HT_IRQ #ifdef CONFIG_SMP static void target_ht_irq(unsigned int irq, unsigned int dest) { struct ht_irq_msg msg; fetch_ht_irq_msg(irq, &msg); msg.address_lo &= ~(HT_IRQ_LOW_DEST_ID_MASK); msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK); msg.address_lo |= HT_IRQ_LOW_DEST_ID(dest); msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest); write_ht_irq_msg(irq, &msg); } static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask) { unsigned int dest; cpumask_t tmp; cpus_and(tmp, mask, cpu_online_map); if (cpus_empty(tmp)) tmp = TARGET_CPUS; cpus_and(mask, tmp, CPU_MASK_ALL); dest = cpu_mask_to_apicid(mask); target_ht_irq(irq, dest); irq_desc[irq].affinity = mask; } #endif static struct irq_chip ht_irq_chip = { .name = "PCI-HT", .mask = mask_ht_irq, .unmask = unmask_ht_irq, .ack = ack_ioapic_irq, #ifdef CONFIG_SMP .set_affinity = set_ht_irq_affinity, #endif .retrigger = ioapic_retrigger_irq, }; int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) { int vector; vector = assign_irq_vector(irq); if (vector >= 0) { struct ht_irq_msg msg; unsigned dest; cpumask_t tmp; cpus_clear(tmp); cpu_set(vector >> 8, tmp); dest = cpu_mask_to_apicid(tmp); msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest); msg.address_lo = HT_IRQ_LOW_BASE | HT_IRQ_LOW_DEST_ID(dest) | HT_IRQ_LOW_VECTOR(vector) | ((INT_DEST_MODE == 0) ? HT_IRQ_LOW_DM_PHYSICAL : HT_IRQ_LOW_DM_LOGICAL) | HT_IRQ_LOW_RQEOI_EDGE | ((INT_DELIVERY_MODE != dest_LowestPrio) ? HT_IRQ_LOW_MT_FIXED : HT_IRQ_LOW_MT_ARBITRATED) | HT_IRQ_LOW_IRQ_MASKED; write_ht_irq_msg(irq, &msg); set_irq_chip_and_handler_name(irq, &ht_irq_chip, handle_edge_irq, "edge"); } return vector; } #endif /* CONFIG_HT_IRQ */ /* -------------------------------------------------------------------------- ACPI-based IOAPIC Configuration -------------------------------------------------------------------------- */ #ifdef CONFIG_ACPI int __init io_apic_get_unique_id (int ioapic, int apic_id) { union IO_APIC_reg_00 reg_00; static physid_mask_t apic_id_map = PHYSID_MASK_NONE; physid_mask_t tmp; unsigned long flags; int i = 0; /* * The P4 platform supports up to 256 APIC IDs on two separate APIC * buses (one for LAPICs, one for IOAPICs), where predecessors only * supports up to 16 on one shared APIC bus. * * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full * advantage of new APIC bus architecture. */ if (physids_empty(apic_id_map)) apic_id_map = ioapic_phys_id_map(phys_cpu_present_map); spin_lock_irqsave(&ioapic_lock, flags); reg_00.raw = io_apic_read(ioapic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); if (apic_id >= get_physical_broadcast()) { printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying " "%d\n", ioapic, apic_id, reg_00.bits.ID); apic_id = reg_00.bits.ID; } /* * Every APIC in a system must have a unique ID or we get lots of nice * 'stuck on smp_invalidate_needed IPI wait' messages. */ if (check_apicid_used(apic_id_map, apic_id)) { for (i = 0; i < get_physical_broadcast(); i++) { if (!check_apicid_used(apic_id_map, i)) break; } if (i == get_physical_broadcast()) panic("Max apic_id exceeded!\n"); printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, " "trying %d\n", ioapic, apic_id, i); apic_id = i; } tmp = apicid_to_cpu_present(apic_id); physids_or(apic_id_map, apic_id_map, tmp); if (reg_00.bits.ID != apic_id) { reg_00.bits.ID = apic_id; spin_lock_irqsave(&ioapic_lock, flags); io_apic_write(ioapic, 0, reg_00.raw); reg_00.raw = io_apic_read(ioapic, 0); spin_unlock_irqrestore(&ioapic_lock, flags); /* Sanity check */ if (reg_00.bits.ID != apic_id) { printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic); return -1; } } apic_printk(APIC_VERBOSE, KERN_INFO "IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id); return apic_id; } int __init io_apic_get_version (int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); reg_01.raw = io_apic_read(ioapic, 1); spin_unlock_irqrestore(&ioapic_lock, flags); return reg_01.bits.version; } int __init io_apic_get_redir_entries (int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; spin_lock_irqsave(&ioapic_lock, flags); reg_01.raw = io_apic_read(ioapic, 1); spin_unlock_irqrestore(&ioapic_lock, flags); return reg_01.bits.entries; } int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low) { struct IO_APIC_route_entry entry; if (!IO_APIC_IRQ(irq)) { printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n", ioapic); return -EINVAL; } /* * Generate a PCI IRQ routing entry and program the IOAPIC accordingly. * Note that we mask (disable) IRQs now -- these get enabled when the * corresponding device driver registers for this IRQ. */ memset(&entry,0,sizeof(entry)); entry.delivery_mode = INT_DELIVERY_MODE; entry.dest_mode = INT_DEST_MODE; entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS); entry.trigger = edge_level; entry.polarity = active_high_low; entry.mask = 1; /* * IRQs < 16 are already in the irq_2_pin[] map */ if (irq >= 16) add_pin_to_irq(irq, ioapic, pin); entry.vector = assign_irq_vector(irq); apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry " "(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic, mp_ioapics[ioapic].mp_apicid, pin, entry.vector, irq, edge_level, active_high_low); ioapic_register_intr(irq, entry.vector, edge_level); if (!ioapic && (irq < 16)) disable_8259A_irq(irq); ioapic_write_entry(ioapic, pin, entry); return 0; } int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity) { int i; if (skip_ioapic_setup) return -1; for (i = 0; i < mp_irq_entries; i++) if (mp_irqs[i].mp_irqtype == mp_INT && mp_irqs[i].mp_srcbusirq == bus_irq) break; if (i >= mp_irq_entries) return -1; *trigger = irq_trigger(i); *polarity = irq_polarity(i); return 0; } #endif /* CONFIG_ACPI */ static int __init parse_disable_timer_pin_1(char *arg) { disable_timer_pin_1 = 1; return 0; } early_param("disable_timer_pin_1", parse_disable_timer_pin_1); static int __init parse_enable_timer_pin_1(char *arg) { disable_timer_pin_1 = -1; return 0; } early_param("enable_timer_pin_1", parse_enable_timer_pin_1); static int __init parse_noapic(char *arg) { /* disable IO-APIC */ disable_ioapic_setup(); return 0; } early_param("noapic", parse_noapic);