| /* |
| * 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 <yaku@css1.kbnes.nec.co.jp> and |
| * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>, |
| * further tested and cleaned up by Zach Brown <zab@redhat.com> |
| * and Ingo Molnar <mingo@redhat.com> |
| * |
| * 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 <linux/mm.h> |
| #include <linux/interrupt.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| #include <linux/sched.h> |
| #include <linux/smp_lock.h> |
| #include <linux/pci.h> |
| #include <linux/mc146818rtc.h> |
| #include <linux/acpi.h> |
| #include <linux/sysdev.h> |
| #include <linux/msi.h> |
| #include <linux/htirq.h> |
| #ifdef CONFIG_ACPI |
| #include <acpi/acpi_bus.h> |
| #endif |
| |
| #include <asm/io.h> |
| #include <asm/smp.h> |
| #include <asm/desc.h> |
| #include <asm/proto.h> |
| #include <asm/mach_apic.h> |
| #include <asm/acpi.h> |
| #include <asm/dma.h> |
| #include <asm/nmi.h> |
| #include <asm/msidef.h> |
| #include <asm/hypertransport.h> |
| |
| static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result); |
| |
| #define __apicdebuginit __init |
| |
| int sis_apic_bug; /* not actually supported, dummy for compile */ |
| |
| static int no_timer_check; |
| |
| static int disable_timer_pin_1 __initdata; |
| |
| int timer_over_8254 __initdata = 1; |
| |
| /* 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); |
| DEFINE_SPINLOCK(vector_lock); |
| |
| /* |
| * # of IRQ routing registers |
| */ |
| int nr_ioapic_registers[MAX_IO_APICS]; |
| |
| /* |
| * Rough estimation of how many shared IRQs there are, can |
| * be changed anytime. |
| */ |
| #define MAX_PLUS_SHARED_IRQS NR_IRQ_VECTORS |
| #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 { |
| short 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].mpc_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. |
| */ |
| static inline void io_apic_modify(unsigned int apic, unsigned int value) |
| { |
| struct io_apic __iomem *io_apic = io_apic_base(apic); |
| writel(value, &io_apic->data); |
| } |
| |
| /* |
| * Synchronize the IO-APIC and the CPU by doing |
| * a dummy read from the IO-APIC |
| */ |
| static inline void io_apic_sync(unsigned int apic) |
| { |
| struct io_apic __iomem *io_apic = io_apic_base(apic); |
| readl(&io_apic->data); |
| } |
| |
| #define __DO_ACTION(R, ACTION, FINAL) \ |
| \ |
| { \ |
| int pin; \ |
| struct irq_pin_list *entry = irq_2_pin + irq; \ |
| \ |
| BUG_ON(irq >= NR_IRQS); \ |
| for (;;) { \ |
| unsigned int reg; \ |
| pin = entry->pin; \ |
| if (pin == -1) \ |
| break; \ |
| reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \ |
| reg ACTION; \ |
| io_apic_modify(entry->apic, reg); \ |
| if (!entry->next) \ |
| break; \ |
| entry = irq_2_pin + entry->next; \ |
| } \ |
| FINAL; \ |
| } |
| |
| 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); |
| } |
| |
| #ifdef CONFIG_SMP |
| static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector) |
| { |
| int apic, pin; |
| struct irq_pin_list *entry = irq_2_pin + irq; |
| |
| BUG_ON(irq >= NR_IRQS); |
| for (;;) { |
| unsigned int reg; |
| apic = entry->apic; |
| pin = entry->pin; |
| if (pin == -1) |
| break; |
| io_apic_write(apic, 0x11 + pin*2, dest); |
| reg = io_apic_read(apic, 0x10 + pin*2); |
| reg &= ~0x000000ff; |
| reg |= vector; |
| io_apic_modify(apic, reg); |
| if (!entry->next) |
| break; |
| entry = irq_2_pin + entry->next; |
| } |
| } |
| |
| static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask) |
| { |
| unsigned long flags; |
| unsigned int dest; |
| cpumask_t tmp; |
| int vector; |
| |
| cpus_and(tmp, mask, cpu_online_map); |
| if (cpus_empty(tmp)) |
| tmp = TARGET_CPUS; |
| |
| cpus_and(mask, tmp, CPU_MASK_ALL); |
| |
| vector = assign_irq_vector(irq, mask, &tmp); |
| if (vector < 0) |
| return; |
| |
| dest = cpu_mask_to_apicid(tmp); |
| |
| /* |
| * Only the high 8 bits are valid. |
| */ |
| dest = SET_APIC_LOGICAL_ID(dest); |
| |
| spin_lock_irqsave(&ioapic_lock, flags); |
| __target_IO_APIC_irq(irq, dest, vector); |
| set_native_irq_info(irq, mask); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| } |
| #endif |
| |
| /* |
| * 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; |
| |
| BUG_ON(irq >= NR_IRQS); |
| 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: ran out of irq_2_pin entries!"); |
| } |
| entry->apic = apic; |
| entry->pin = pin; |
| } |
| |
| |
| #define DO_ACTION(name,R,ACTION, FINAL) \ |
| \ |
| static void name##_IO_APIC_irq (unsigned int irq) \ |
| __DO_ACTION(R, ACTION, FINAL) |
| |
| DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) ) |
| /* mask = 1 */ |
| DO_ACTION( __unmask, 0, &= 0xfffeffff, ) |
| /* mask = 0 */ |
| |
| 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); |
| } |
| |
| int skip_ioapic_setup; |
| int ioapic_force; |
| |
| /* dummy parsing: see setup.c */ |
| |
| static int __init disable_ioapic_setup(char *str) |
| { |
| skip_ioapic_setup = 1; |
| return 0; |
| } |
| early_param("noapic", disable_ioapic_setup); |
| |
| /* Actually the next is obsolete, but keep it for paranoid reasons -AK */ |
| static int __init disable_timer_pin_setup(char *arg) |
| { |
| disable_timer_pin_1 = 1; |
| return 1; |
| } |
| __setup("disable_timer_pin_1", disable_timer_pin_setup); |
| |
| 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); |
| |
| |
| /* |
| * 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].mpc_irqtype == type && |
| (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid || |
| mp_irqs[i].mpc_dstapic == MP_APIC_ALL) && |
| mp_irqs[i].mpc_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].mpc_srcbus; |
| |
| if (test_bit(lbus, mp_bus_not_pci) && |
| (mp_irqs[i].mpc_irqtype == type) && |
| (mp_irqs[i].mpc_srcbusirq == irq)) |
| |
| return mp_irqs[i].mpc_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].mpc_srcbus; |
| |
| if (test_bit(lbus, mp_bus_not_pci) && |
| (mp_irqs[i].mpc_irqtype == type) && |
| (mp_irqs[i].mpc_srcbusirq == irq)) |
| break; |
| } |
| if (i < mp_irq_entries) { |
| int apic; |
| for(apic = 0; apic < nr_ioapics; apic++) { |
| if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_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 (mp_bus_id_to_pci_bus[bus] == -1) { |
| apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus); |
| return -1; |
| } |
| for (i = 0; i < mp_irq_entries; i++) { |
| int lbus = mp_irqs[i].mpc_srcbus; |
| |
| for (apic = 0; apic < nr_ioapics; apic++) |
| if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic || |
| mp_irqs[i].mpc_dstapic == MP_APIC_ALL) |
| break; |
| |
| if (!test_bit(lbus, mp_bus_not_pci) && |
| !mp_irqs[i].mpc_irqtype && |
| (bus == lbus) && |
| (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) { |
| int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq); |
| |
| if (!(apic || IO_APIC_IRQ(irq))) |
| continue; |
| |
| if (pin == (mp_irqs[i].mpc_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; |
| } |
| } |
| BUG_ON(best_guess >= NR_IRQS); |
| return best_guess; |
| } |
| |
| /* 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) |
| |
| /* 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) |
| |
| static int __init MPBIOS_polarity(int idx) |
| { |
| int bus = mp_irqs[idx].mpc_srcbus; |
| int polarity; |
| |
| /* |
| * Determine IRQ line polarity (high active or low active): |
| */ |
| switch (mp_irqs[idx].mpc_irqflag & 3) |
| { |
| case 0: /* conforms, ie. bus-type dependent polarity */ |
| if (test_bit(bus, mp_bus_not_pci)) |
| polarity = default_ISA_polarity(idx); |
| else |
| polarity = 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].mpc_srcbus; |
| int trigger; |
| |
| /* |
| * Determine IRQ trigger mode (edge or level sensitive): |
| */ |
| switch ((mp_irqs[idx].mpc_irqflag>>2) & 3) |
| { |
| case 0: /* conforms, ie. bus-type dependent */ |
| if (test_bit(bus, mp_bus_not_pci)) |
| trigger = default_ISA_trigger(idx); |
| else |
| trigger = default_PCI_trigger(idx); |
| 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].mpc_srcbus; |
| |
| /* |
| * Debugging check, we are in big trouble if this message pops up! |
| */ |
| if (mp_irqs[idx].mpc_dstirq != pin) |
| printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n"); |
| |
| if (test_bit(bus, mp_bus_not_pci)) { |
| irq = mp_irqs[idx].mpc_srcbusirq; |
| } else { |
| /* |
| * PCI IRQs are mapped in order |
| */ |
| i = irq = 0; |
| while (i < apic) |
| irq += nr_ioapic_registers[i++]; |
| irq += pin; |
| } |
| BUG_ON(irq >= NR_IRQS); |
| 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 = { |
| [0] = FIRST_EXTERNAL_VECTOR + 0, |
| [1] = FIRST_EXTERNAL_VECTOR + 1, |
| [2] = FIRST_EXTERNAL_VECTOR + 2, |
| [3] = FIRST_EXTERNAL_VECTOR + 3, |
| [4] = FIRST_EXTERNAL_VECTOR + 4, |
| [5] = FIRST_EXTERNAL_VECTOR + 5, |
| [6] = FIRST_EXTERNAL_VECTOR + 6, |
| [7] = FIRST_EXTERNAL_VECTOR + 7, |
| [8] = FIRST_EXTERNAL_VECTOR + 8, |
| [9] = FIRST_EXTERNAL_VECTOR + 9, |
| [10] = FIRST_EXTERNAL_VECTOR + 10, |
| [11] = FIRST_EXTERNAL_VECTOR + 11, |
| [12] = FIRST_EXTERNAL_VECTOR + 12, |
| [13] = FIRST_EXTERNAL_VECTOR + 13, |
| [14] = FIRST_EXTERNAL_VECTOR + 14, |
| [15] = FIRST_EXTERNAL_VECTOR + 15, |
| }; |
| |
| static cpumask_t irq_domain[NR_IRQ_VECTORS] __read_mostly = { |
| [0] = CPU_MASK_ALL, |
| [1] = CPU_MASK_ALL, |
| [2] = CPU_MASK_ALL, |
| [3] = CPU_MASK_ALL, |
| [4] = CPU_MASK_ALL, |
| [5] = CPU_MASK_ALL, |
| [6] = CPU_MASK_ALL, |
| [7] = CPU_MASK_ALL, |
| [8] = CPU_MASK_ALL, |
| [9] = CPU_MASK_ALL, |
| [10] = CPU_MASK_ALL, |
| [11] = CPU_MASK_ALL, |
| [12] = CPU_MASK_ALL, |
| [13] = CPU_MASK_ALL, |
| [14] = CPU_MASK_ALL, |
| [15] = CPU_MASK_ALL, |
| }; |
| |
| static int __assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result) |
| { |
| /* |
| * 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. ;) |
| */ |
| static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0; |
| int old_vector = -1; |
| int cpu; |
| |
| BUG_ON((unsigned)irq >= NR_IRQ_VECTORS); |
| |
| /* Only try and allocate irqs on cpus that are present */ |
| cpus_and(mask, mask, cpu_online_map); |
| |
| if (irq_vector[irq] > 0) |
| old_vector = irq_vector[irq]; |
| if (old_vector > 0) { |
| cpus_and(*result, irq_domain[irq], mask); |
| if (!cpus_empty(*result)) |
| return old_vector; |
| } |
| |
| for_each_cpu_mask(cpu, mask) { |
| cpumask_t domain, new_mask; |
| int new_cpu; |
| int vector, offset; |
| |
| domain = vector_allocation_domain(cpu); |
| cpus_and(new_mask, domain, cpu_online_map); |
| |
| vector = current_vector; |
| offset = current_offset; |
| next: |
| vector += 8; |
| if (vector >= FIRST_SYSTEM_VECTOR) { |
| /* If we run out of vectors on large boxen, must share them. */ |
| offset = (offset + 1) % 8; |
| vector = FIRST_DEVICE_VECTOR + offset; |
| } |
| if (unlikely(current_vector == vector)) |
| continue; |
| if (vector == IA32_SYSCALL_VECTOR) |
| goto next; |
| for_each_cpu_mask(new_cpu, new_mask) |
| if (per_cpu(vector_irq, new_cpu)[vector] != -1) |
| goto next; |
| /* Found one! */ |
| current_vector = vector; |
| current_offset = offset; |
| if (old_vector >= 0) { |
| cpumask_t old_mask; |
| int old_cpu; |
| cpus_and(old_mask, irq_domain[irq], cpu_online_map); |
| for_each_cpu_mask(old_cpu, old_mask) |
| per_cpu(vector_irq, old_cpu)[old_vector] = -1; |
| } |
| for_each_cpu_mask(new_cpu, new_mask) |
| per_cpu(vector_irq, new_cpu)[vector] = irq; |
| irq_vector[irq] = vector; |
| irq_domain[irq] = domain; |
| cpus_and(*result, domain, mask); |
| return vector; |
| } |
| return -ENOSPC; |
| } |
| |
| static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result) |
| { |
| int vector; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&vector_lock, flags); |
| vector = __assign_irq_vector(irq, mask, result); |
| spin_unlock_irqrestore(&vector_lock, flags); |
| return vector; |
| } |
| |
| static void __clear_irq_vector(int irq) |
| { |
| cpumask_t mask; |
| int cpu, vector; |
| |
| BUG_ON(!irq_vector[irq]); |
| |
| vector = irq_vector[irq]; |
| cpus_and(mask, irq_domain[irq], cpu_online_map); |
| for_each_cpu_mask(cpu, mask) |
| per_cpu(vector_irq, cpu)[vector] = -1; |
| |
| irq_vector[irq] = 0; |
| irq_domain[irq] = CPU_MASK_NONE; |
| } |
| |
| void __setup_vector_irq(int cpu) |
| { |
| /* Initialize vector_irq on a new cpu */ |
| /* This function must be called with vector_lock held */ |
| int irq, vector; |
| |
| /* Mark the inuse vectors */ |
| for (irq = 0; irq < NR_IRQ_VECTORS; ++irq) { |
| if (!cpu_isset(cpu, irq_domain[irq])) |
| continue; |
| vector = irq_vector[irq]; |
| per_cpu(vector_irq, cpu)[vector] = irq; |
| } |
| /* Mark the free vectors */ |
| for (vector = 0; vector < NR_VECTORS; ++vector) { |
| irq = per_cpu(vector_irq, cpu)[vector]; |
| if (irq < 0) |
| continue; |
| if (!cpu_isset(cpu, irq_domain[irq])) |
| per_cpu(vector_irq, cpu)[vector] = -1; |
| } |
| } |
| |
| |
| extern void (*interrupt[NR_IRQS])(void); |
| |
| 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) |
| set_irq_chip_and_handler_name(irq, &ioapic_chip, |
| handle_fasteoi_irq, "fasteoi"); |
| else { |
| irq_desc[irq].status |= IRQ_DELAYED_DISABLE; |
| set_irq_chip_and_handler_name(irq, &ioapic_chip, |
| handle_edge_irq, "edge"); |
| } |
| } |
| static void __init setup_IO_APIC_irq(int apic, int pin, int idx, int irq) |
| { |
| struct IO_APIC_route_entry entry; |
| int vector; |
| unsigned long flags; |
| |
| |
| /* |
| * 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 = cpu_mask_to_apicid(TARGET_CPUS); |
| |
| entry.trigger = irq_trigger(idx); |
| entry.polarity = irq_polarity(idx); |
| |
| if (irq_trigger(idx)) { |
| entry.trigger = 1; |
| entry.mask = 1; |
| entry.dest = cpu_mask_to_apicid(TARGET_CPUS); |
| } |
| |
| if (!apic && !IO_APIC_IRQ(irq)) |
| return; |
| |
| if (IO_APIC_IRQ(irq)) { |
| cpumask_t mask; |
| vector = assign_irq_vector(irq, TARGET_CPUS, &mask); |
| if (vector < 0) |
| return; |
| |
| entry.dest = cpu_mask_to_apicid(mask); |
| entry.vector = vector; |
| |
| ioapic_register_intr(irq, vector, IOAPIC_AUTO); |
| if (!apic && (irq < 16)) |
| disable_8259A_irq(irq); |
| } |
| |
| ioapic_write_entry(apic, pin, entry); |
| |
| spin_lock_irqsave(&ioapic_lock, flags); |
| set_native_irq_info(irq, TARGET_CPUS); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| |
| } |
| |
| static void __init setup_IO_APIC_irqs(void) |
| { |
| int apic, pin, idx, irq, first_notcon = 1; |
| |
| 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++) { |
| |
| 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].mpc_apicid, pin); |
| first_notcon = 0; |
| } else |
| apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin); |
| continue; |
| } |
| |
| irq = pin_2_irq(idx, apic, pin); |
| add_pin_to_irq(irq, apic, pin); |
| |
| setup_IO_APIC_irq(apic, pin, idx, irq); |
| |
| } |
| } |
| |
| if (!first_notcon) |
| apic_printk(APIC_VERBOSE," not connected.\n"); |
| } |
| |
| /* |
| * Set up the 8259A-master output pin as broadcast to all |
| * CPUs. |
| */ |
| static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector) |
| { |
| struct IO_APIC_route_entry entry; |
| unsigned long flags; |
| |
| memset(&entry,0,sizeof(entry)); |
| |
| disable_8259A_irq(0); |
| |
| /* mask LVT0 */ |
| apic_write(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 = 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 ... |
| */ |
| set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge"); |
| |
| /* |
| * Add it to the IO-APIC irq-routing table: |
| */ |
| spin_lock_irqsave(&ioapic_lock, flags); |
| io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1)); |
| io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0)); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| |
| enable_8259A_irq(0); |
| } |
| |
| void __init UNEXPECTED_IO_APIC(void) |
| { |
| } |
| |
| void __apicdebuginit 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; |
| 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].mpc_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); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| |
| printk("\n"); |
| printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid); |
| printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw); |
| printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID); |
| if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2) |
| UNEXPECTED_IO_APIC(); |
| |
| printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01); |
| printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries); |
| if ( (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */ |
| (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */ |
| (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */ |
| (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */ |
| (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */ |
| (reg_01.bits.entries != 0x2E) && |
| (reg_01.bits.entries != 0x3F) && |
| (reg_01.bits.entries != 0x03) |
| ) |
| UNEXPECTED_IO_APIC(); |
| |
| printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ); |
| printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version); |
| if ( (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */ |
| (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */ |
| (reg_01.bits.version != 0x10) && /* oldest IO-APICs */ |
| (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */ |
| (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */ |
| (reg_01.bits.version != 0x20) /* Intel P64H (82806 AA) */ |
| ) |
| UNEXPECTED_IO_APIC(); |
| if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2) |
| UNEXPECTED_IO_APIC(); |
| |
| if (reg_01.bits.version >= 0x10) { |
| printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw); |
| printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration); |
| if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2) |
| UNEXPECTED_IO_APIC(); |
| } |
| |
| printk(KERN_DEBUG ".... IRQ redirection table:\n"); |
| |
| printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol" |
| " Stat Dmod 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 ", |
| i, |
| entry.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 __apicdebuginit 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<<j)) |
| printk("1"); |
| else |
| printk("0"); |
| } |
| printk("\n"); |
| } |
| } |
| |
| void __apicdebuginit print_local_APIC(void * dummy) |
| { |
| unsigned int v, ver, maxlvt; |
| |
| if (apic_verbosity == APIC_QUIET) |
| return; |
| |
| printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n", |
| smp_processor_id(), hard_smp_processor_id()); |
| v = apic_read(APIC_ID); |
| printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v)); |
| v = apic_read(APIC_LVR); |
| printk(KERN_INFO "... APIC VERSION: %08x\n", v); |
| ver = GET_APIC_VERSION(v); |
| maxlvt = get_maxlvt(); |
| |
| v = apic_read(APIC_TASKPRI); |
| printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK); |
| |
| v = apic_read(APIC_ARBPRI); |
| printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v, |
| v & APIC_ARBPRI_MASK); |
| v = apic_read(APIC_PROCPRI); |
| printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v); |
| |
| v = apic_read(APIC_EOI); |
| printk(KERN_DEBUG "... APIC EOI: %08x\n", v); |
| v = apic_read(APIC_RRR); |
| printk(KERN_DEBUG "... APIC RRR: %08x\n", v); |
| v = apic_read(APIC_LDR); |
| printk(KERN_DEBUG "... APIC LDR: %08x\n", v); |
| v = apic_read(APIC_DFR); |
| printk(KERN_DEBUG "... APIC DFR: %08x\n", v); |
| v = apic_read(APIC_SPIV); |
| printk(KERN_DEBUG "... APIC SPIV: %08x\n", v); |
| |
| printk(KERN_DEBUG "... APIC ISR field:\n"); |
| print_APIC_bitfield(APIC_ISR); |
| printk(KERN_DEBUG "... APIC TMR field:\n"); |
| print_APIC_bitfield(APIC_TMR); |
| printk(KERN_DEBUG "... APIC IRR field:\n"); |
| print_APIC_bitfield(APIC_IRR); |
| |
| 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 __apicdebuginit 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; |
| } |
| |
| /* |
| * 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 */ |
| 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 = GET_APIC_ID(apic_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); |
| } |
| |
| /* |
| * 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; |
| |
| local_irq_enable(); |
| /* Let ten ticks pass... */ |
| mdelay((10 * 1000) / HZ); |
| |
| /* |
| * 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. |
| */ |
| |
| /* jiffies wrap? */ |
| if (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. |
| */ |
| |
| /* |
| * 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... |
| */ |
| |
| 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 int ioapic_retrigger_irq(unsigned int irq) |
| { |
| cpumask_t mask; |
| unsigned vector; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&vector_lock, flags); |
| vector = irq_vector[irq]; |
| cpus_clear(mask); |
| cpu_set(first_cpu(irq_domain[irq]), mask); |
| |
| send_IPI_mask(mask, vector); |
| spin_unlock_irqrestore(&vector_lock, flags); |
| |
| return 1; |
| } |
| |
| /* |
| * Level and edge triggered IO-APIC interrupts need different handling, |
| * so we use two separate IRQ descriptors. Edge triggered IRQs can be |
| * handled with the level-triggered descriptor, but that one has slightly |
| * more overhead. Level-triggered interrupts cannot be handled with the |
| * edge-triggered handler, without risking IRQ storms and other ugly |
| * races. |
| */ |
| |
| static void ack_apic_edge(unsigned int irq) |
| { |
| move_native_irq(irq); |
| ack_APIC_irq(); |
| } |
| |
| static void ack_apic_level(unsigned int irq) |
| { |
| int do_unmask_irq = 0; |
| |
| #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) |
| /* If we are moving the irq we need to mask it */ |
| if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) { |
| do_unmask_irq = 1; |
| mask_IO_APIC_irq(irq); |
| } |
| #endif |
| |
| /* |
| * We must acknowledge the irq before we move it or the acknowledge will |
| * not propogate properly. |
| */ |
| ack_APIC_irq(); |
| |
| /* Now we can move and renable the irq */ |
| move_masked_irq(irq); |
| if (unlikely(do_unmask_irq)) |
| unmask_IO_APIC_irq(irq); |
| } |
| |
| 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_apic_edge, |
| .eoi = ack_apic_level, |
| #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++) { |
| int tmp = irq; |
| if (IO_APIC_IRQ(tmp) && !irq_vector[tmp]) { |
| /* |
| * 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; |
| } |
| } |
| } |
| |
| static void enable_lapic_irq (unsigned int irq) |
| { |
| unsigned long v; |
| |
| v = apic_read(APIC_LVT0); |
| apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED); |
| } |
| |
| static void disable_lapic_irq (unsigned int irq) |
| { |
| unsigned long v; |
| |
| v = apic_read(APIC_LVT0); |
| apic_write(APIC_LVT0, v | APIC_LVT_MASKED); |
| } |
| |
| static void ack_lapic_irq (unsigned int irq) |
| { |
| ack_APIC_irq(); |
| } |
| |
| static void end_lapic_irq (unsigned int i) { /* nothing */ } |
| |
| static struct hw_interrupt_type lapic_irq_type __read_mostly = { |
| .typename = "local-APIC-edge", |
| .startup = NULL, /* startup_irq() not used for IRQ0 */ |
| .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */ |
| .enable = enable_lapic_irq, |
| .disable = disable_lapic_irq, |
| .ack = ack_lapic_irq, |
| .end = end_lapic_irq, |
| }; |
| |
| static void 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. |
| */ |
| printk(KERN_INFO "activating NMI Watchdog ..."); |
| |
| enable_NMI_through_LVT0(NULL); |
| |
| printk(" 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 unlock_ExtINT_logic(void) |
| { |
| int apic, pin, i; |
| struct IO_APIC_route_entry entry0, entry1; |
| unsigned char save_control, save_freq_select; |
| unsigned long flags; |
| |
| pin = find_isa_irq_pin(8, mp_INT); |
| apic = find_isa_irq_apic(8, mp_INT); |
| if (pin == -1) |
| return; |
| |
| spin_lock_irqsave(&ioapic_lock, flags); |
| *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin); |
| *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| 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 = hard_smp_processor_id(); |
| entry1.delivery_mode = dest_ExtINT; |
| entry1.polarity = entry0.polarity; |
| entry1.trigger = 0; |
| entry1.vector = 0; |
| |
| spin_lock_irqsave(&ioapic_lock, flags); |
| io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1)); |
| io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0)); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| |
| 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); |
| |
| spin_lock_irqsave(&ioapic_lock, flags); |
| io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1)); |
| io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0)); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| } |
| |
| /* |
| * 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. |
| * |
| * FIXME: really need to revamp this for modern platforms only. |
| */ |
| static inline void check_timer(void) |
| { |
| int apic1, pin1, apic2, pin2; |
| int vector; |
| cpumask_t mask; |
| |
| /* |
| * get/set the timer IRQ vector: |
| */ |
| disable_8259A_irq(0); |
| vector = assign_irq_vector(0, TARGET_CPUS, &mask); |
| |
| /* |
| * 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. |
| */ |
| apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); |
| init_8259A(1); |
| 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; |
| |
| apic_printk(APIC_VERBOSE,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 (!no_timer_check && timer_irq_works()) { |
| nmi_watchdog_default(); |
| 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); |
| return; |
| } |
| clear_IO_APIC_pin(apic1, pin1); |
| apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not " |
| "connected to IO-APIC\n"); |
| } |
| |
| apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) " |
| "through the 8259A ... "); |
| if (pin2 != -1) { |
| apic_printk(APIC_VERBOSE,"\n..... (found apic %d pin %d) ...", |
| apic2, pin2); |
| /* |
| * legacy devices should be connected to IO APIC #0 |
| */ |
| setup_ExtINT_IRQ0_pin(apic2, pin2, vector); |
| if (timer_irq_works()) { |
| apic_printk(APIC_VERBOSE," works.\n"); |
| nmi_watchdog_default(); |
| if (nmi_watchdog == NMI_IO_APIC) { |
| setup_nmi(); |
| } |
| return; |
| } |
| /* |
| * Cleanup, just in case ... |
| */ |
| clear_IO_APIC_pin(apic2, pin2); |
| } |
| apic_printk(APIC_VERBOSE," 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; |
| } |
| |
| apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ..."); |
| |
| disable_8259A_irq(0); |
| irq_desc[0].chip = &lapic_irq_type; |
| apic_write(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */ |
| enable_8259A_irq(0); |
| |
| if (timer_irq_works()) { |
| apic_printk(APIC_VERBOSE," works.\n"); |
| return; |
| } |
| apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector); |
| apic_printk(APIC_VERBOSE," failed.\n"); |
| |
| apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ..."); |
| |
| init_8259A(0); |
| make_8259A_irq(0); |
| apic_write(APIC_LVT0, APIC_DM_EXTINT); |
| |
| unlock_ExtINT_logic(); |
| |
| if (timer_irq_works()) { |
| apic_printk(APIC_VERBOSE," works.\n"); |
| return; |
| } |
| apic_printk(APIC_VERBOSE," failed :(.\n"); |
| panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n"); |
| } |
| |
| static int __init notimercheck(char *s) |
| { |
| no_timer_check = 1; |
| return 1; |
| } |
| __setup("no_timer_check", notimercheck); |
| |
| /* |
| * |
| * 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<<2) |
| |
| void __init setup_IO_APIC(void) |
| { |
| enable_IO_APIC(); |
| |
| if (acpi_ioapic) |
| io_apic_irqs = ~0; /* all IRQs go through IOAPIC */ |
| else |
| io_apic_irqs = ~PIC_IRQS; |
| |
| apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n"); |
| |
| sync_Arb_IDs(); |
| setup_IO_APIC_irqs(); |
| init_IO_APIC_traps(); |
| check_timer(); |
| if (!acpi_ioapic) |
| print_IO_APIC(); |
| } |
| |
| 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 ++ ) |
| *entry = 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].mpc_apicid) { |
| reg_00.bits.ID = mp_ioapics[dev->id].mpc_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 = { |
| set_kset_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; |
| int new; |
| int vector = 0; |
| unsigned long flags; |
| cpumask_t mask; |
| |
| 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, TARGET_CPUS, &mask); |
| if (likely(vector > 0)) |
| irq = new; |
| break; |
| } |
| spin_unlock_irqrestore(&vector_lock, flags); |
| |
| if (irq >= 0) { |
| 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_irq_vector(irq); |
| spin_unlock_irqrestore(&vector_lock, flags); |
| } |
| |
| /* |
| * MSI mesage 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; |
| cpumask_t tmp; |
| |
| vector = assign_irq_vector(irq, TARGET_CPUS, &tmp); |
| if (vector >= 0) { |
| dest = cpu_mask_to_apicid(tmp); |
| |
| 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; |
| |
| cpus_and(mask, tmp, CPU_MASK_ALL); |
| |
| vector = assign_irq_vector(irq, mask, &tmp); |
| if (vector < 0) |
| return; |
| |
| dest = cpu_mask_to_apicid(tmp); |
| |
| 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); |
| set_native_irq_info(irq, 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_apic_edge, |
| #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; |
| |
| set_irq_msi(irq, desc); |
| ret = msi_compose_msg(dev, irq, &msg); |
| if (ret < 0) { |
| destroy_irq(irq); |
| return ret; |
| } |
| |
| write_msi_msg(irq, &msg); |
| |
| set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge"); |
| |
| return irq; |
| } |
| |
| 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, u8 vector) |
| { |
| struct ht_irq_msg msg; |
| fetch_ht_irq_msg(irq, &msg); |
| |
| msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK); |
| msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK); |
| |
| msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | 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; |
| int vector; |
| |
| cpus_and(tmp, mask, cpu_online_map); |
| if (cpus_empty(tmp)) |
| tmp = TARGET_CPUS; |
| |
| cpus_and(mask, tmp, CPU_MASK_ALL); |
| |
| vector = assign_irq_vector(irq, mask, &tmp); |
| if (vector < 0) |
| return; |
| |
| dest = cpu_mask_to_apicid(tmp); |
| |
| target_ht_irq(irq, dest, vector); |
| set_native_irq_info(irq, mask); |
| } |
| #endif |
| |
| static struct irq_chip ht_irq_chip = { |
| .name = "PCI-HT", |
| .mask = mask_ht_irq, |
| .unmask = unmask_ht_irq, |
| .ack = ack_apic_edge, |
| #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; |
| cpumask_t tmp; |
| |
| vector = assign_irq_vector(irq, TARGET_CPUS, &tmp); |
| if (vector >= 0) { |
| struct ht_irq_msg msg; |
| unsigned dest; |
| |
| 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 |
| |
| #define IO_APIC_MAX_ID 0xFE |
| |
| 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 triggering, int polarity) |
| { |
| struct IO_APIC_route_entry entry; |
| unsigned long flags; |
| int vector; |
| cpumask_t mask; |
| |
| if (!IO_APIC_IRQ(irq)) { |
| apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n", |
| ioapic); |
| return -EINVAL; |
| } |
| |
| /* |
| * IRQs < 16 are already in the irq_2_pin[] map |
| */ |
| if (irq >= 16) |
| add_pin_to_irq(irq, ioapic, pin); |
| |
| |
| vector = assign_irq_vector(irq, TARGET_CPUS, &mask); |
| if (vector < 0) |
| return vector; |
| |
| /* |
| * 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 = cpu_mask_to_apicid(mask); |
| entry.trigger = triggering; |
| entry.polarity = polarity; |
| entry.mask = 1; /* Disabled (masked) */ |
| entry.vector = vector & 0xff; |
| |
| apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> " |
| "IRQ %d Mode:%i Active:%i)\n", ioapic, |
| mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq, |
| triggering, polarity); |
| |
| ioapic_register_intr(irq, entry.vector, triggering); |
| |
| if (!ioapic && (irq < 16)) |
| disable_8259A_irq(irq); |
| |
| ioapic_write_entry(ioapic, pin, entry); |
| |
| spin_lock_irqsave(&ioapic_lock, flags); |
| set_native_irq_info(irq, TARGET_CPUS); |
| spin_unlock_irqrestore(&ioapic_lock, flags); |
| |
| return 0; |
| } |
| |
| #endif /* CONFIG_ACPI */ |
| |
| |
| /* |
| * 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); |
| |
| /* setup_IO_APIC_irqs could fail to get vector for some device |
| * when you have too many devices, because at that time only boot |
| * cpu is online. |
| */ |
| if(!irq_vector[irq]) |
| setup_IO_APIC_irq(ioapic, pin, irq_entry, irq); |
| else |
| set_ioapic_affinity_irq(irq, TARGET_CPUS); |
| } |
| |
| } |
| } |
| #endif |