diff options
Diffstat (limited to 'arch/x86_64/kernel/io_apic.c')
| -rw-r--r-- | arch/x86_64/kernel/io_apic.c | 103 |
1 files changed, 84 insertions, 19 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c index fe429e5..41bfc49 100644 --- a/arch/x86_64/kernel/io_apic.c +++ b/arch/x86_64/kernel/io_apic.c @@ -88,6 +88,52 @@ 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) \ \ { \ @@ -126,12 +172,34 @@ static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin) 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) { unsigned long flags; union entry_union eu; eu.entry = e; spin_lock_irqsave(&ioapic_lock, flags); + io_apic_write(apic, 0x11 + 2*pin, eu.w2); + io_apic_write(apic, 0x10 + 2*pin, eu.w1); + 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); @@ -256,9 +324,7 @@ static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) /* * Disable it in the IO-APIC irq-routing table: */ - memset(&entry, 0, sizeof(entry)); - entry.mask = 1; - ioapic_write_entry(apic, pin, entry); + ioapic_mask_entry(apic, pin); } static void clear_IO_APIC (void) @@ -1889,18 +1955,16 @@ void arch_teardown_msi_irq(unsigned int irq) static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector) { - u32 low, high; - low = read_ht_irq_low(irq); - high = read_ht_irq_high(irq); + struct ht_irq_msg msg; + fetch_ht_irq_msg(irq, &msg); - low &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK); - high &= ~(HT_IRQ_HIGH_DEST_ID_MASK); + msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK); + msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK); - low |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest); - high |= HT_IRQ_HIGH_DEST_ID(dest); + 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_low(irq, low); - write_ht_irq_high(irq, high); + write_ht_irq_msg(irq, &msg); } static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask) @@ -1921,7 +1985,7 @@ static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask) dest = cpu_mask_to_apicid(tmp); - target_ht_irq(irq, dest, vector & 0xff); + target_ht_irq(irq, dest, vector); set_native_irq_info(irq, mask); } #endif @@ -1944,14 +2008,15 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) vector = assign_irq_vector(irq, TARGET_CPUS, &tmp); if (vector >= 0) { - u32 low, high; + struct ht_irq_msg msg; unsigned dest; dest = cpu_mask_to_apicid(tmp); - high = HT_IRQ_HIGH_DEST_ID(dest); + msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest); - low = HT_IRQ_LOW_BASE | + msg.address_lo = + HT_IRQ_LOW_BASE | HT_IRQ_LOW_DEST_ID(dest) | HT_IRQ_LOW_VECTOR(vector) | ((INT_DEST_MODE == 0) ? @@ -1960,10 +2025,10 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) HT_IRQ_LOW_RQEOI_EDGE | ((INT_DELIVERY_MODE != dest_LowestPrio) ? HT_IRQ_LOW_MT_FIXED : - HT_IRQ_LOW_MT_ARBITRATED); + HT_IRQ_LOW_MT_ARBITRATED) | + HT_IRQ_LOW_IRQ_MASKED; - write_ht_irq_low(irq, low); - write_ht_irq_high(irq, high); + write_ht_irq_msg(irq, &msg); set_irq_chip_and_handler_name(irq, &ht_irq_chip, handle_edge_irq, "edge"); |