diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-15 19:23:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-15 19:23:40 -0700 |
| commit | 5f6fb45466b2273ffb91c9cf209f164f666c33b1 (patch) | |
| tree | 2b19f24b678ae379be1b19338c3095c1f76ed41d | |
| parent | 3904afb41d4316f7a2968c615d689e19149a4f84 (diff) | |
| parent | c0185808eb85139f45dbfd0de66963c498d0c4db (diff) | |
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (116 commits)
x86: Enable forced interrupt threading support
x86: Mark low level interrupts IRQF_NO_THREAD
x86: Use generic show_interrupts
x86: ioapic: Avoid redundant lookup of irq_cfg
x86: ioapic: Use new move_irq functions
x86: Use the proper accessors in fixup_irqs()
x86: ioapic: Use irq_data->state
x86: ioapic: Simplify irq chip and handler setup
x86: Cleanup the genirq name space
genirq: Add chip flag to force mask on suspend
genirq: Add desc->irq_data accessor
genirq: Add comments to Kconfig switches
genirq: Fixup fasteoi handler for oneshot mode
genirq: Provide forced interrupt threading
sched: Switch wait_task_inactive to schedule_hrtimeout()
genirq: Add IRQF_NO_THREAD
genirq: Allow shared oneshot interrupts
genirq: Prepare the handling of shared oneshot interrupts
genirq: Make warning in handle_percpu_event useful
x86: ioapic: Move trigger defines to io_apic.h
...
Fix up trivial(?) conflicts in arch/x86/pci/xen.c due to genirq name
space changes clashing with the Xen cleanups. The set_irq_msi() had
moved to xen_bind_pirq_msi_to_irq().
35 files changed, 2112 insertions, 1120 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index f4a04c0c7ed..738c6fda3fb 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2444,6 +2444,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted. <deci-seconds>: poll all this frequency 0: no polling (default) + threadirqs [KNL] + Force threading of all interrupt handlers except those + marked explicitely IRQF_NO_THREAD. + topology= [S390] Format: {off | on} Specify if the kernel should make use of the cpu diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 43214e30329..a42660c7356 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -68,6 +68,8 @@ config X86 select GENERIC_FIND_NEXT_BIT select GENERIC_IRQ_PROBE select GENERIC_PENDING_IRQ if SMP + select GENERIC_IRQ_SHOW + select IRQ_FORCED_THREADING select USE_GENERIC_SMP_HELPERS if SMP config INSTRUCTION_DECODER @@ -813,7 +815,7 @@ config X86_LOCAL_APIC config X86_IO_APIC def_bool y - depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC + depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC config X86_VISWS_APIC def_bool y diff --git a/arch/x86/include/asm/apicdef.h b/arch/x86/include/asm/apicdef.h index 47a30ff8e51..d87988bacf3 100644 --- a/arch/x86/include/asm/apicdef.h +++ b/arch/x86/include/asm/apicdef.h @@ -426,4 +426,16 @@ struct local_apic { #else #define BAD_APICID 0xFFFFu #endif + +enum ioapic_irq_destination_types { + dest_Fixed = 0, + dest_LowestPrio = 1, + dest_SMI = 2, + dest__reserved_1 = 3, + dest_NMI = 4, + dest_INIT = 5, + dest__reserved_2 = 6, + dest_ExtINT = 7 +}; + #endif /* _ASM_X86_APICDEF_H */ diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h index f327d386d6c..c4bd267dfc5 100644 --- a/arch/x86/include/asm/io_apic.h +++ b/arch/x86/include/asm/io_apic.h @@ -63,17 +63,6 @@ union IO_APIC_reg_03 { } __attribute__ ((packed)) bits; }; -enum ioapic_irq_destination_types { - dest_Fixed = 0, - dest_LowestPrio = 1, - dest_SMI = 2, - dest__reserved_1 = 3, - dest_NMI = 4, - dest_INIT = 5, - dest__reserved_2 = 6, - dest_ExtINT = 7 -}; - struct IO_APIC_route_entry { __u32 vector : 8, delivery_mode : 3, /* 000: FIXED @@ -106,6 +95,10 @@ struct IR_IO_APIC_route_entry { index : 15; } __attribute__ ((packed)); +#define IOAPIC_AUTO -1 +#define IOAPIC_EDGE 0 +#define IOAPIC_LEVEL 1 + #ifdef CONFIG_X86_IO_APIC /* @@ -150,11 +143,6 @@ extern int timer_through_8259; #define io_apic_assign_pci_irqs \ (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs) -extern u8 io_apic_unique_id(u8 id); -extern int io_apic_get_unique_id(int ioapic, int apic_id); -extern int io_apic_get_version(int ioapic); -extern int io_apic_get_redir_entries(int ioapic); - struct io_apic_irq_attr; extern int io_apic_set_pci_routing(struct device *dev, int irq, struct io_apic_irq_attr *irq_attr); @@ -162,6 +150,8 @@ void setup_IO_APIC_irq_extra(u32 gsi); extern void ioapic_and_gsi_init(void); extern void ioapic_insert_resources(void); +int io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr); + extern struct IO_APIC_route_entry **alloc_ioapic_entries(void); extern void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries); extern int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries); @@ -186,6 +176,8 @@ extern void __init pre_init_apic_IRQ0(void); extern void mp_save_irq(struct mpc_intsrc *m); +extern void disable_ioapic_support(void); + #else /* !CONFIG_X86_IO_APIC */ #define io_apic_assign_pci_irqs 0 @@ -199,6 +191,26 @@ static inline int mp_find_ioapic(u32 gsi) { return 0; } struct io_apic_irq_attr; static inline int io_apic_set_pci_routing(struct device *dev, int irq, struct io_apic_irq_attr *irq_attr) { return 0; } + +static inline struct IO_APIC_route_entry **alloc_ioapic_entries(void) +{ + return NULL; +} + +static inline void free_ioapic_entries(struct IO_APIC_route_entry **ent) { } +static inline int save_IO_APIC_setup(struct IO_APIC_route_entry **ent) +{ + return -ENOMEM; +} + +static inline void mask_IO_APIC_setup(struct IO_APIC_route_entry **ent) { } +static inline int restore_IO_APIC_setup(struct IO_APIC_route_entry **ent) +{ + return -ENOMEM; +} + +static inline void mp_save_irq(struct mpc_intsrc *m) { }; +static inline void disable_ioapic_support(void) { } #endif #endif /* _ASM_X86_IO_APIC_H */ diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 3606feb7d67..48dcd2e83b4 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -43,6 +43,7 @@ #include <asm/i8259.h> #include <asm/proto.h> #include <asm/apic.h> +#include <asm/io_apic.h> #include <asm/desc.h> #include <asm/hpet.h> #include <asm/idle.h> @@ -1209,7 +1210,7 @@ void __cpuinit setup_local_APIC(void) rdtscll(tsc); if (disable_apic) { - arch_disable_smp_support(); + disable_ioapic_support(); return; } @@ -1448,7 +1449,7 @@ int __init enable_IR(void) void __init enable_IR_x2apic(void) { unsigned long flags; - struct IO_APIC_route_entry **ioapic_entries = NULL; + struct IO_APIC_route_entry **ioapic_entries; int ret, x2apic_enabled = 0; int dmar_table_init_ret; diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index ca9e2a3545a..4b5ebd26f56 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -108,7 +108,10 @@ DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES); int skip_ioapic_setup; -void arch_disable_smp_support(void) +/** + * disable_ioapic_support() - disables ioapic support at runtime + */ +void disable_ioapic_support(void) { #ifdef CONFIG_PCI noioapicquirk = 1; @@ -120,11 +123,14 @@ void arch_disable_smp_support(void) static int __init parse_noapic(char *str) { /* disable IO-APIC */ - arch_disable_smp_support(); + disable_ioapic_support(); return 0; } early_param("noapic", parse_noapic); +static int io_apic_setup_irq_pin_once(unsigned int irq, int node, + struct io_apic_irq_attr *attr); + /* Will be called in mpparse/acpi/sfi codes for saving IRQ info */ void mp_save_irq(struct mpc_intsrc *m) { @@ -181,7 +187,7 @@ int __init arch_early_irq_init(void) irq_reserve_irqs(0, legacy_pic->nr_legacy_irqs); for (i = 0; i < count; i++) { - set_irq_chip_data(i, &cfg[i]); + irq_set_chip_data(i, &cfg[i]); zalloc_cpumask_var_node(&cfg[i].domain, GFP_KERNEL, node); zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_KERNEL, node); /* @@ -200,7 +206,7 @@ int __init arch_early_irq_init(void) #ifdef CONFIG_SPARSE_IRQ static struct irq_cfg *irq_cfg(unsigned int irq) { - return get_irq_chip_data(irq); + return irq_get_chip_data(irq); } static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node) @@ -226,7 +232,7 @@ static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg) { if (!cfg) return; - set_irq_chip_data(at, NULL); + irq_set_chip_data(at, NULL); free_cpumask_var(cfg->domain); free_cpumask_var(cfg->old_domain); kfree(cfg); @@ -256,14 +262,14 @@ static struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node) if (res < 0) { if (res != -EEXIST) return NULL; - cfg = get_irq_chip_data(at); + cfg = irq_get_chip_data(at); if (cfg) return cfg; } cfg = alloc_irq_cfg(at, node); if (cfg) - set_irq_chip_data(at, cfg); + irq_set_chip_data(at, cfg); else irq_free_desc(at); return cfg; @@ -818,7 +824,7 @@ static int EISA_ELCR(unsigned int irq) #define default_MCA_trigger(idx) (1) #define default_MCA_polarity(idx) default_ISA_polarity(idx) -static int MPBIOS_polarity(int idx) +static int irq_polarity(int idx) { int bus = mp_irqs[idx].srcbus; int polarity; @@ -860,7 +866,7 @@ static int MPBIOS_polarity(int idx) return polarity; } -static int MPBIOS_trigger(int idx) +static int irq_trigger(int idx) { int bus = mp_irqs[idx].srcbus; int trigger; @@ -932,16 +938,6 @@ static int MPBIOS_trigger(int idx) 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; @@ -1189,7 +1185,7 @@ void __setup_vector_irq(int cpu) raw_spin_lock(&vector_lock); /* Mark the inuse vectors */ for_each_active_irq(irq) { - cfg = get_irq_chip_data(irq); + cfg = irq_get_chip_data(irq); if (!cfg) continue; /* @@ -1220,10 +1216,6 @@ void __setup_vector_irq(int cpu) static struct irq_chip ioapic_chip; static struct irq_chip ir_ioapic_chip; -#define IOAPIC_AUTO -1 -#define IOAPIC_EDGE 0 -#define IOAPIC_LEVEL 1 - #ifdef CONFIG_X86_32 static inline int IO_APIC_irq_trigger(int irq) { @@ -1248,35 +1240,31 @@ static inline int IO_APIC_irq_trigger(int irq) } #endif -static void ioapic_register_intr(unsigned int irq, unsigned long trigger) +static void ioapic_register_intr(unsigned int irq, struct irq_cfg *cfg, + unsigned long trigger) { + struct irq_chip *chip = &ioapic_chip; + irq_flow_handler_t hdl; + bool fasteoi; if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) || - trigger == IOAPIC_LEVEL) + trigger == IOAPIC_LEVEL) { irq_set_status_flags(irq, IRQ_LEVEL); - else + fasteoi = true; + } else { irq_clear_status_flags(irq, IRQ_LEVEL); + fasteoi = false; + } - if (irq_remapped(get_irq_chip_data(irq))) { + if (irq_remapped(cfg)) { irq_set_status_flags(irq, IRQ_MOVE_PCNTXT); - if (trigger) - set_irq_chip_and_handler_name(irq, &ir_ioapic_chip, - handle_fasteoi_irq, - "fasteoi"); - else - set_irq_chip_and_handler_name(irq, &ir_ioapic_chip, - handle_edge_irq, "edge"); - return; + chip = &ir_ioapic_chip; + fasteoi = trigger != 0; } - 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 - set_irq_chip_and_handler_name(irq, &ioapic_chip, - handle_edge_irq, "edge"); + hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq; + irq_set_chip_and_handler_name(irq, chip, hdl, + fasteoi ? "fasteoi" : "edge"); } static int setup_ioapic_entry(int apic_id, int irq, @@ -1374,7 +1362,7 @@ static void setup_ioapic_irq(int apic_id, int pin, unsigned int irq, return; } - ioapic_register_intr(irq, trigger); + ioapic_register_intr(irq, cfg, trigger); if (irq < legacy_pic->nr_legacy_irqs) legacy_pic->mask(irq); @@ -1385,33 +1373,26 @@ static struct { DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1); } mp_ioapic_routing[MAX_IO_APICS]; -static void __init setup_IO_APIC_irqs(void) +static bool __init io_apic_pin_not_connected(int idx, int apic_id, int pin) { - int apic_id, pin, idx, irq, notcon = 0; - int node = cpu_to_node(0); - struct irq_cfg *cfg; + if (idx != -1) + return false; - apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n"); + apic_printk(APIC_VERBOSE, KERN_DEBUG " apic %d pin %d not connected\n", + mp_ioapics[apic_id].apicid, pin); + return true; +} + +static void __init __io_apic_setup_irqs(unsigned int apic_id) +{ + int idx, node = cpu_to_node(0); + struct io_apic_irq_attr attr; + unsigned int pin, irq; - for (apic_id = 0; apic_id < nr_ioapics; apic_id++) for (pin = 0; pin < nr_ioapic_registers[apic_id]; pin++) { idx = find_irq_entry(apic_id, pin, mp_INT); - if (idx == -1) { - if (!notcon) { - notcon = 1; - apic_printk(APIC_VERBOSE, - KERN_DEBUG " %d-%d", - mp_ioapics[apic_id].apicid, pin); - } else - apic_printk(APIC_VERBOSE, " %d-%d", - mp_ioapics[apic_id].apicid, pin); + if (io_apic_pin_not_connected(idx, apic_id, pin)) continue; - } - if (notcon) { - apic_printk(APIC_VERBOSE, - " (apicid-pin) not connected\n"); - notcon = 0; - } irq = pin_2_irq(idx, apic_id, pin); @@ -1423,25 +1404,24 @@ static void __init setup_IO_APIC_irqs(void) * installed and if it returns 1: */ if (apic->multi_timer_check && - apic->multi_timer_check(apic_id, irq)) + apic->multi_timer_check(apic_id, irq)) continue; - cfg = alloc_irq_and_cfg_at(irq, node); - if (!cfg) - continue; + set_io_apic_irq_attr(&attr, apic_id, pin, irq_trigger(idx), + irq_polarity(idx)); - add_pin_to_irq_node(cfg, node, apic_id, pin); - /* - * don't mark it in pin_programmed, so later acpi could - * set it correctly when irq < 16 - */ - setup_ioapic_irq(apic_id, pin, irq, cfg, irq_trigger(idx), - irq_polarity(idx)); + io_apic_setup_irq_pin(irq, node, &attr); } +} - if (notcon) - apic_printk(APIC_VERBOSE, - " (apicid-pin) not connected\n"); +static void __init setup_IO_APIC_irqs(void) +{ + unsigned int apic_id; + + apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n"); + + for (apic_id = 0; apic_id < nr_ioapics; apic_id++) + __io_apic_setup_irqs(apic_id); } /* @@ -1452,7 +1432,7 @@ static void __init setup_IO_APIC_irqs(void) void setup_IO_APIC_irq_extra(u32 gsi) { int apic_id = 0, pin, idx, irq, node = cpu_to_node(0); - struct irq_cfg *cfg; + struct io_apic_irq_attr attr; /* * Convert 'gsi' to 'ioapic.pin'. @@ -1472,21 +1452,10 @@ void setup_IO_APIC_irq_extra(u32 gsi) if (apic_id == 0 || irq < NR_IRQS_LEGACY) return; - cfg = alloc_irq_and_cfg_at(irq, node); - if (!cfg) - return; - - add_pin_to_irq_node(cfg, node, apic_id, pin); - - if (test_bit(pin, mp_ioapic_routing[apic_id].pin_programmed)) { - pr_debug("Pin %d-%d already programmed\n", - mp_ioapics[apic_id].apicid, pin); - return; - } - set_bit(pin, mp_ioapic_routing[apic_id].pin_programmed); + set_io_apic_irq_attr(&attr, apic_id, pin, irq_trigger(idx), + irq_polarity(idx)); - setup_ioapic_irq(apic_id, pin, irq, cfg, - irq_trigger(idx), irq_polarity(idx)); + io_apic_setup_irq_pin_once(irq, node, &attr); } /* @@ -1518,7 +1487,8 @@ static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin, * The timer IRQ doesn't have to know that behind the * scene we may have a 8259A-master in AEOI mode ... */ - set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge"); + irq_set_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, + "edge"); /* * Add it to the IO-APIC irq-routing table: @@ -1625,7 +1595,7 @@ __apicdebuginit(void) print_IO_APIC(void) for_each_active_irq(irq) { struct irq_pin_list *entry; - cfg = get_irq_chip_data(irq); + cfg = irq_get_chip_data(irq); if (!cfg) continue; entry = cfg->irq_2_pin; @@ -2391,7 +2361,7 @@ static void irq_complete_move(struct irq_cfg *cfg) void irq_force_complete_move(int irq) { - struct irq_cfg *cfg = get_irq_chip_data(irq); + struct irq_cfg *cfg = irq_get_chip_data(irq); if (!cfg) return; @@ -2405,7 +2375,7 @@ static inline void irq_complete_move(struct irq_cfg *cfg) { } static void ack_apic_edge(struct irq_data *data) { irq_complete_move(data->chip_data); - move_native_irq(data->irq); + irq_move_irq(data); ack_APIC_irq(); } @@ -2462,7 +2432,7 @@ static void ack_apic_level(struct irq_data *data) irq_complete_move(cfg); #ifdef CONFIG_GENERIC_PENDING_IRQ /* If we are moving the irq we need to mask it */ - if (unlikely(irq_to_desc(irq)->status & IRQ_MOVE_PENDING)) { + if (unlikely(irqd_is_setaffinity_pending(data))) { do_unmask_irq = 1; mask_ioapic(cfg); } @@ -2551,7 +2521,7 @@ static void ack_apic_level(struct irq_data *data) * and you can go talk to the chipset vendor about it. */ if (!io_apic_level_ack_pending(cfg)) - move_masked_irq(irq); + irq_move_masked_irq(data); unmask_ioapic(cfg); } } @@ -2614,7 +2584,7 @@ static inline void init_IO_APIC_traps(void) * 0x80, because int 0x80 is hm, kind of importantish. ;) */ for_each_active_irq(irq) { - cfg = get_irq_chip_data(irq); + cfg = irq_get_chip_data(irq); if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) { /* * Hmm.. We don't have an entry for this, @@ -2625,7 +2595,7 @@ static inline void init_IO_APIC_traps(void) legacy_pic->make_irq(irq); else /* Strange. Oh, well.. */ - set_irq_chip(irq, &no_irq_chip); + irq_set_chip(irq, &no_irq_chip); } } } @@ -2665,7 +2635,7 @@ static struct irq_chip lapic_chip __read_mostly = { static void lapic_register_intr(int irq) { irq_clear_status_flags(irq, IRQ_LEVEL); - set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq, + irq_set_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq, "edge"); } @@ -2749,7 +2719,7 @@ int timer_through_8259 __initdata; */ static inline void __init check_timer(void) { - struct irq_cfg *cfg = get_irq_chip_data(0); + struct irq_cfg *cfg = irq_get_chip_data(0); int node = cpu_to_node(0); int apic1, pin1, apic2, pin2; unsigned long flags; @@ -3060,7 +3030,7 @@ unsigned int create_irq_nr(unsigned int from, int node) raw_spin_unlock_irqrestore(&vector_lock, flags); if (ret) { - set_irq_chip_data(irq, cfg); + irq_set_chip_data(irq, cfg); irq_clear_status_flags(irq, IRQ_NOREQUEST); } else { free_irq_at(irq, cfg); @@ -3085,7 +3055,7 @@ int create_irq(void) void destroy_irq(unsigned int irq) { - struct irq_cfg *cfg = get_irq_chip_data(irq); + struct irq_cfg *cfg = irq_get_chip_data(irq); unsigned long flags; irq_set_status_flags(irq, IRQ_NOREQUEST|IRQ_NOPROBE); @@ -3119,7 +3089,7 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus()); - if (irq_remapped(get_irq_chip_data(irq))) { + if (irq_remapped(cfg)) { struct irte irte; int ir_index; u16 sub_handle; @@ -3291,6 +3261,7 @@ static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec) static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq) { + struct irq_chip *chip = &msi_chip; struct msi_msg msg; int ret; @@ -3298,14 +3269,15 @@ static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq) if (ret < 0) return ret; - set_irq_msi(irq, msidesc); + irq_set_msi_desc(irq, msidesc); write_msi_msg(irq, &msg); - if (irq_remapped(get_irq_chip_data(irq))) { + if (irq_remapped(irq_get_chip_data(irq))) { irq_set_status_flags(irq, IRQ_MOVE_PCNTXT); - set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge"); - } else - set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge"); + chip = &msi_ir_chip; + } + + irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge"); dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq); @@ -3423,8 +3395,8 @@ int arch_setup_dmar_msi(unsigned int irq) if (ret < 0) return ret; dmar_msi_write(irq, &msg); - set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq, - "edge"); + irq_set_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq, + "edge"); return 0; } #endif @@ -3482,6 +3454,7 @@ static struct irq_chip hpet_msi_type = { int arch_setup_hpet_msi(unsigned int irq, unsigned int id) { + struct irq_chip *chip = &hpet_msi_type; struct msi_msg msg; int ret; @@ -3501,15 +3474,12 @@ int arch_setup_hpet_msi(unsigned int irq, unsigned int id) if (ret < 0) return ret; - hpet_msi_write(get_irq_data(irq), &msg); + hpet_msi_write(irq_get_handler_data(irq), &msg); irq_set_status_flags(irq, IRQ_MOVE_PCNTXT); - if (irq_remapped(get_irq_chip_data(irq))) - set_irq_chip_and_handler_name(irq, &ir_hpet_msi_type, - handle_edge_irq, "edge"); - else - set_irq_chip_and_handler_name(irq, &hpet_msi_type, - handle_edge_irq, "edge"); + if (irq_remapped(irq_get_chip_data(irq))) + chip = &ir_hpet_msi_type; + irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge"); return 0; } #endif @@ -3596,7 +3566,7 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) write_ht_irq_msg(irq, &msg); - set_irq_chip_and_handler_name(irq, &ht_irq_chip, + irq_set_chip_and_handler_name(irq, &ht_irq_chip, handle_edge_irq, "edge"); dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq); @@ -3605,7 +3575,40 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) } #endif /* CONFIG_HT_IRQ */ -int __init io_apic_get_redir_entries (int ioapic) +int +io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr) +{ + struct irq_cfg *cfg = alloc_irq_and_cfg_at(irq, node); + int ret; + + if (!cfg) + return -EINVAL; + ret = __add_pin_to_irq_node(cfg, node, attr->ioapic, attr->ioapic_pin); + if (!ret) + setup_ioapic_irq(attr->ioapic, attr->ioapic_pin, irq, cfg, + attr->trigger, attr->polarity); + return ret; +} + +static int io_apic_setup_irq_pin_once(unsigned int irq, int node, + struct io_apic_irq_attr *attr) +{ + unsigned int id = attr->ioapic, pin = attr->ioapic_pin; + int ret; + + /* Avoid redundant programming */ + if (test_bit(pin, mp_ioapic_routing[id].pin_programmed)) { + pr_debug("Pin %d-%d already programmed\n", + mp_ioapics[id].apicid, pin); + return 0; + } + ret = io_apic_setup_irq_pin(irq, node, attr); + if (!ret) + set_bit(pin, mp_ioapic_routing[id].pin_programmed); + return ret; +} + +static int __init io_apic_get_redir_entries(int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; @@ -3659,96 +3662,24 @@ int __init arch_probe_nr_irqs(void) } #endif -static int __io_apic_set_pci_routing(struct device *dev, int irq, - struct io_apic_irq_attr *irq_attr) +int io_apic_set_pci_routing(struct device *dev, int irq, + struct io_apic_irq_attr *irq_attr) { - struct irq_cfg *cfg; int node; - int ioapic, pin; - int trigger, polarity; - ioapic = irq_attr->ioapic; if (!IO_APIC_IRQ(irq)) { apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n", - ioapic); + irq_attr->ioapic); return -EINVAL; } - if (dev) - node = dev_to_node(dev); - else - node = cpu_to_node(0); - - cfg = alloc_irq_and_cfg_at(irq, node); - if (!cfg) - return 0; - - pin = irq_attr->ioapic_pin; - trigger = irq_attr->trigger; - polarity = irq_attr->polarity; + node = dev ? dev_to_node(dev) : cpu_to_node(0); - /* - * IRQs < 16 are already in the irq_2_pin[] map - */ - if (irq >= legacy_pic->nr_legacy_irqs) { - if (__add_pin_to_irq_node(cfg, node, ioapic, pin)) { - printk(KERN_INFO "can not add pin %d for irq %d\n", - pin, irq); - return 0; - } - } - - setup_ioapic_irq(ioapic, pin, irq, cfg, trigger, polarity); - - return 0; + return io_apic_setup_irq_pin_once(irq, node, irq_attr); } -int io_apic_set_pci_routing(struct device *dev, int irq, - struct io_apic_irq_attr *irq_attr) -{ - int ioapic, pin; - /* - * Avoid pin reprogramming. PRTs typically include entries - * with redundant pin->gsi mappings (but unique PCI devices); - * we only program the IOAPIC on the first. - */ - ioapic = irq_attr->ioapic; - pin = irq_attr->ioapic_pin; - if (test_bit(pin, mp_ioapic_routing[ioapic].pin_programmed)) { - pr_debug("Pin %d-%d already programmed\n", - mp_ioapics[ioapic].apicid, pin); - return 0; - } - set_bit(pin, mp_ioapic_routing[ioapic].pin_programmed); - - return __io_apic_set_pci_routing(dev, irq, irq_attr); -} - -u8 __init io_apic_unique_id(u8 id) -{ #ifdef CONFIG_X86_32 - if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && - !APIC_XAPIC(apic_version[boot_cpu_physical_apicid])) - return io_apic_get_unique_id(nr_ioapics, id); - else - return id; -#else - int i; - DECLARE_BITMAP(used, 256); - - bitmap_zero(used, 256); - for (i = 0; i < nr_ioapics; i++) { - struct mpc_ioapic *ia = &mp_ioapics[i]; - __set_bit(ia->apicid, used); - } - if (!test_bit(id, used)) - return id; - return find_first_zero_bit(used, 256); -#endif -} - -#ifdef CONFIG_X86_32 -int __init io_apic_get_unique_id(int ioapic, int apic_id) +static 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; @@ -3821,9 +3752,33 @@ int __init io_apic_get_unique_id(int ioapic, int apic_id) return apic_id; } + +static u8 __init io_apic_unique_id(u8 id) +{ + if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && + !APIC_XAPIC(apic_version[boot_cpu_physical_apicid])) + return io_apic_get_unique_id(nr_ioapics, id); + else + return id; +} +#else +static u8 __init io_apic_unique_id(u8 id) +{ + int i; + DECLARE_BITMAP(used, 256); + + bitmap_zero(used, 256); + for (i = 0; i < nr_ioapics; i++) { + struct mpc_ioapic *ia = &mp_ioapics[i]; + __set_bit(ia->apicid, used); + } + if (!test_bit(id, used)) + return id; + return find_first_zero_bit(used, 256); +} #endif -int __init io_apic_get_version(int ioapic) +static int __init io_apic_get_version(int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; @@ -3868,8 +3823,8 @@ int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity) void __init setup_ioapic_dest(void) { int pin, ioapic, irq, irq_entry; - struct irq_desc *desc; const struct cpumask *mask; + struct irq_data *idata; if (skip_ioapic_setup == 1) return; @@ -3884,21 +3839,20 @@ void __init setup_ioapic_dest(void) if ((ioapic > 0) && (irq > 16)) continue; - desc = irq_to_desc(irq); + idata = irq_get_irq_data(irq); /* * Honour affinities which have been set in early boot */ - if (desc->status & - (IRQ_NO_BALANCING | IRQ_AFFINITY_SET)) - mask = desc->irq_data.affinity; + if (!irqd_can_balance(idata) || irqd_affinity_was_set(idata)) + mask = idata->affinity; else mask = apic->target_cpus(); if (intr_remapping_enabled) - ir_ioapic_set_affinity(&desc->irq_data, mask, false); + ir_ioapic_set_affinity(idata, mask, false); else - ioapic_set_affinity(&desc->irq_data, mask, false); + ioapic_set_affinity(idata, mask, false); } } @@ -4026,7 +3980,7 @@ int mp_find_ioapic_pin(int ioapic, u32 gsi) return gsi - mp_gsi_routing[ioapic].gsi_base; } -static int bad_ioapic(unsigned long address) +static __init int bad_ioapic(unsigned long address) { if (nr_ioapics >= MAX_IO_APICS) { printk(KERN_WARNING "WARING: Max # of I/O APICs (%d) exceeded " @@ -4086,20 +4040,16 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base) /* Enable IOAPIC early just for system timer */ void __init pre_init_apic_IRQ0(void) { - struct irq_cfg *cfg; + struct io_apic_irq_attr attr = { 0, 0, 0, 0 }; printk(KERN_INFO "Early APIC setup for system timer0\n"); #ifndef CONFIG_SMP physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); #endif - /* Make sure the irq descriptor is set up */ - cfg = alloc_irq_and_cfg_at(0, 0); - setup_local_APIC(); - add_pin_to_irq_node(cfg, 0, 0, 0); - set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge"); - - setup_ioapic_irq(0, 0, 0, cfg, 0, 0); + io_apic_setup_irq_pin(0, 0, &attr); + irq_set_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, + "edge"); } diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index 4ff5968f12d..bfe8f729e08 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -503,7 +503,7 @@ static int hpet_assign_irq(struct hpet_dev *dev) if (!irq) return -EINVAL; - set_irq_data(irq, dev); + irq_set_handler_data(irq, dev); if (hpet_setup_msi_irq(irq)) return -EINVAL; diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c index 20757cb2efa..d9ca749c123 100644 --- a/arch/x86/kernel/i8259.c +++ b/arch/x86/kernel/i8259.c @@ -112,7 +112,7 @@ static void make_8259A_irq(unsigned int irq) { disable_irq_nosync(irq); io_apic_irqs &= ~(1<<irq); - set_irq_chip_and_handler_name(irq, &i8259A_chip, handle_level_irq, + irq_set_chip_and_handler_name(irq, &i8259A_chip, handle_level_irq, i8259A_chip.name); enable_irq(irq); } diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index 387b6a0c9e8..5ee693faa11 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -44,9 +44,9 @@ void ack_bad_irq(unsigned int irq) #define irq_stats(x) (&per_cpu(irq_stat, x)) /* - * /proc/interrupts printing: + * /proc/interrupts printing for arch specific interrupts */ -static int show_other_interrupts(struct seq_file *p, int prec) +int arch_show_interrupts(struct seq_file *p, int prec) { int j; @@ -122,59 +122,6 @@ static int show_other_interrupts(struct seq_file *p, int prec) return 0; } -int show_interrupts(struct seq_file *p, void *v) -{ - unsigned long flags, any_count = 0; - int i = *(loff_t *) v, j, prec; - struct irqaction *action; - struct irq_desc *desc; - - if (i > nr_irqs) - return 0; - - for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) - j *= 10; - - if (i == nr_irqs) - return show_other_interrupts(p, prec); - - /* print header */ - if (i == 0) { - seq_printf(p, "%*s", prec + 8, ""); - for_each_online_cpu(j) - seq_printf(p, "CPU%-8d", j); - seq_putc(p, '\n'); - } - - desc = irq_to_desc(i); - if (!desc) - return 0; - - raw_spin_lock_irqsave(&desc->lock, flags); - for_each_online_cpu(j) - any_count |= kstat_irqs_cpu(i, j); - action = desc->action; - if (!action && !any_count) - goto out; - - seq_printf(p, "%*d: ", prec, i); - for_each_online_cpu(j) - seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); - seq_printf(p, " %8s", desc->irq_data.chip->name); - seq_printf(p, "-%-8s", desc->name); - - if (action) { - seq_printf(p, " %s", action->name); - while ((action = action->next) != NULL) - seq_printf(p, ", %s", action->name); - } - - seq_putc(p, '\n'); -out: - raw_spin_unlock_irqrestore(&desc->lock, flags); - return 0; -} - /* * /proc/stat helpers */ @@ -293,6 +240,7 @@ void fixup_irqs(void) static int warned; struct irq_desc *desc; struct irq_data *data; + struct irq_chip *chip; for_each_irq_desc(irq, desc) { int break_affinity = 0; @@ -307,10 +255,10 @@ void fixup_irqs(void) /* interrupt's are disabled at this point */ raw_spin_lock(&desc->lock); - data = &desc->irq_data; + data = irq_desc_get_irq_data(desc); affinity = data->affinity; if (!irq_has_action(irq) || - cpumask_equal(affinity, cpu_online_mask)) { + cpumask_subset(affinity, cpu_online_mask)) { raw_spin_unlock(&desc->lock); continue; } @@ -327,16 +275,17 @@ void fixup_irqs(void) affinity = cpu_all_mask; } - if (!(desc->status & IRQ_MOVE_PCNTXT) && data->chip->irq_mask) - data->chip->irq_mask(data); + chip = irq_data_get_irq_chip(data); + if (!irqd_can_move_in_process_context(data) && chip->irq_mask) + chip->irq_mask(data); - if (data->chip->irq_set_affinity) - data->chip->irq_set_affinity(data, affinity, true); + if (chip->irq_set_affinity) + chip->irq_set_affinity(data, affinity, true); else if (!(warned++)) set_affinity = 0; - if (!(desc->status & IRQ_MOVE_PCNTXT) && data->chip->irq_unmask) - data->chip->irq_unmask(data); + if (!irqd_can_move_in_process_context(data) && chip->irq_unmask) + chip->irq_unmask(data); raw_spin_unlock(&desc->lock); @@ -368,10 +317,11 @@ void fixup_irqs(void) irq = __this_cpu_read(vector_irq[vector]); desc = irq_to_desc(irq); - data = &desc->irq_data; + data = irq_desc_get_irq_data(desc); + chip = irq_data_get_irq_chip(data); raw_spin_lock(&desc->lock); - if (data->chip->irq_retrigger) - data->chip->irq_retrigger(data); + if (chip->irq_retrigger) + chip->irq_retrigger(data); raw_spin_unlock(&desc->lock); } } diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c index c752e973958..1cc302d16fb 100644 --- a/arch/x86/kernel/irqinit.c +++ b/arch/x86/kernel/irqinit.c @@ -71,6 +71,7 @@ static irqreturn_t math_error_irq(int cpl, void *dev_id) static struct irqaction fpu_irq = { .handler = math_error_irq, .name = "fpu", + .flags = IRQF_NO_THREAD, }; #endif @@ -80,6 +81,7 @@ static struct irqaction fpu_irq = { static struct irqaction irq2 = { .handler = no_action, .name = "cascade", + .flags = IRQF_NO_THREAD, }; DEFINE_PER_CPU(vector_irq_t, vector_irq) = { @@ -110,7 +112,7 @@ void __init init_ISA_irqs(void) legacy_pic->init(0); for (i = 0; i < legacy_pic->nr_legacy_irqs; i++) - set_irq_chip_and_handler_name(i, chip, handle_level_irq, name); + irq_set_chip_and_handler_name(i, chip, handle_level_irq, name); } void __init init_IRQ(void) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index e2865df242b..16ce4261399 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -64,6 +64,7 @@ #include <asm/mtrr.h> #include <asm/mwait.h> #include <asm/apic.h> +#include <asm/io_apic.h> #include <asm/setup.h> #include <asm/uv/uv.h> #include <linux/mc146818rtc.h> @@ -927,6 +928,14 @@ int __cpuinit native_cpu_up(unsigned int cpu) return 0; } +/** + * arch_disable_smp_support() - disables SMP support for x86 at runtime + */ +void arch_disable_smp_support(void) +{ + disable_ioapic_support(); +} + /* * Fall back to non SMP mode after errors. * @@ -1027,7 +1036,7 @@ static int __init smp_sanity_check(unsigned max_cpus) "(tell your hw vendor)\n"); } smpboot_clear_io_apic(); - arch_disable_smp_support(); + disable_ioapic_support(); return -1; } diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index eba687f0cc0..b9ec1c74943 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -847,7 +847,7 @@ static void __init lguest_init_IRQ(void) void lguest_setup_irq(unsigned int irq) { irq_alloc_desc_at(irq, 0); - set_irq_chip_and_handler_name(irq, &lguest_irq_controller, + irq_set_chip_and_handler_name(irq, &lguest_irq_controller, handle_level_irq, "level"); } @@ -995,7 +995,7 @@ static void lguest_time_irq(unsigned int irq, struct irq_desc *desc) static void lguest_time_init(void) { /* Set up the timer interrupt (0) to go to our simple timer routine */ - set_irq_handler(0, lguest_time_irq); + irq_set_handler(0, lguest_time_irq); clocksource_register(&lguest_clock); diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c index 7b24460917d..374a05d8ad2 100644 --- a/arch/x86/platform/uv/uv_irq.c +++ b/arch/x86/platform/uv/uv_irq.c @@ -131,7 +131,7 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade, unsigned long mmr_offset, int limit) { const struct cpumask *eligible_cpu = cpumask_of(cpu); - struct irq_cfg *cfg = get_irq_chip_data(irq); + struct irq_cfg *cfg = irq_get_chip_data(irq); unsigned long mmr_value; struct uv_IO_APIC_route_entry *entry; int mmr_pnode, err; @@ -148,7 +148,7 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade, else irq_set_status_flags(irq, IRQ_MOVE_PCNTXT); - set_irq_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq, + irq_set_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq, irq_name); mmr_value = 0; diff --git a/arch/x86/platform/visws/visws_quirks.c b/arch/x86/platform/visws/visws_quirks.c index 63203767174..fe4cf829487 100644 --- a/arch/x86/platform/visws/visws_quirks.c +++ b/arch/x86/platform/visws/visws_quirks.c @@ -569,11 +569,13 @@ out_unlock: static struct irqaction master_action = { .handler = piix4_master_intr, .name = "PIIX4-8259", + .flags = IRQF_NO_THREAD, }; static struct irqaction cascade_action = { .handler = no_action, .name = "cascade", + .flags = IRQF_NO_THREAD, }; static inline void set_piix4_virtual_irq_type(void) @@ -606,7 +608,7 @@ static void __init visws_pre_intr_init(void) chip = &cobalt_irq_type; if (chip) - set_irq_chip(i, chip); + irq_set_chip(i, chip); } setup_irq(CO_IRQ_8259, &master_action); diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 149fa875e39..0ad1699a1b3 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -674,7 +674,7 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc, irq_info[irq] = mk_pirq_info(0, pirq, 0, vector); pirq_to_irq[pirq] = irq; - ret = set_irq_msi(irq, msidesc); + ret = irq_set_msi_desc(irq, msidesc); if (ret < 0) goto error_irq; out: diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 2eb16e03422..59b72ca1c5d 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -14,6 +14,8 @@ #include <linux/smp.h> #include <linux/percpu.h> #include <linux/hrtimer.h> +#include <linux/kref.h> +#include <linux/workqueue.h> #include <asm/atomic.h> #include <asm/ptrace.h> @@ -56,6 +58,7 @@ * irq line disabled until the threaded handler has been run. * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set + * IRQF_NO_THREAD - Interrupt cannot be threaded */ #define IRQF_DISABLED 0x00000020 #define IRQF_SAMPLE_RANDOM 0x00000040 @@ -68,22 +71,9 @@ #define IRQF_ONESHOT 0x00002000 #define IRQF_NO_SUSPEND 0x00004000 #define IRQF_FORCE_RESUME 0x00008000 +#define IRQF_NO_THREAD 0x00010000 -#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND) - -/* - * Bits used by threaded handlers: - * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run - * IRQTF_DIED - handler thread died - * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed - * IRQTF_AFFINITY - irq thread is requested to adjust affinity - */ -enum { - IRQTF_RUNTHREAD, - IRQTF_DIED, - IRQTF_WARNED, - IRQTF_AFFINITY, -}; +#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) /* * These values can be returned by request_any_context_irq() and @@ -111,6 +101,7 @@ typedef irqreturn_t (*irq_handler_t)(int, void *); * @thread_fn: interupt handler function for threaded interrupts * @thread: thread pointer for threaded interrupts * @thread_flags: flags related to @thread + * @thread_mask: bitmask for keeping track of @thread activity */ struct irqaction { irq_handler_t handler; @@ -121,6 +112,7 @@ struct irqaction { irq_handler_t thread_fn; struct task_struct *thread; unsigned long thread_flags; + unsigned long thread_mask; const char *name; struct proc_dir_entry *dir; } ____cacheline_internodealigned_in_smp; @@ -241,6 +233,35 @@ extern int irq_can_set_affinity(unsigned int irq); extern int irq_select_affinity(unsigned int irq); extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); + +/** + * struct irq_affinity_notify - context for notification of IRQ affinity changes + * @irq: Interrupt to which notification applies + * @kref: Reference count, for internal use + * @work: Work item, for internal use + * @notify: Function to be called on change. This will be + * called in process context. + * @release: Function to be called on release. This will be + * called in process context. Once registered, the + * structure must only be freed when this function is + * called or later. + */ +struct irq_affinity_notify { + unsigned int irq; + struct kref kref; + struct work_struct work; + void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); + void (*release)(struct kref *ref); +}; + +extern int +irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); + +static inline void irq_run_affinity_notifiers(void) +{ + flush_scheduled_work(); +} + #else /* CONFIG_SMP */ static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) @@ -256,7 +277,7 @@ static inline int irq_can_set_affinity(unsigned int irq) static inline int irq_select_affinity(unsigned int irq) { return 0; } static inline int irq_set_affinity_hint(unsigned int irq, - const struct cpumask *m) + const struct cpumask *m) { return -EINVAL; } @@ -315,16 +336,24 @@ static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long } /* IRQ wakeup (PM) control: */ -extern int set_irq_wake(unsigned int irq, unsigned int on); +extern int irq_set_irq_wake(unsigned int irq, unsigned int on); + +#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT +/* Please do not use: Use the replacement functions instead */ +static inline int set_irq_wake(unsigned int irq, unsigned int on) +{ + return irq_set_irq_wake(irq, on); +} +#endif static inline int enable_irq_wake(unsigned int irq) { - return set_irq_wake(irq, 1); + return irq_set_irq_wake(irq, 1); } static inline int disable_irq_wake(unsigned int irq) { - return set_irq_wake(irq, 0); + return irq_set_irq_wake(irq, 0); } #else /* !CONFIG_GENERIC_HARDIRQS */ @@ -354,6 +383,13 @@ static inline int disable_irq_wake(unsigned int irq) } #endif /* CONFIG_GENERIC_HARDIRQS */ + +#ifdef CONFIG_IRQ_FORCED_THREADING +extern bool force_irqthreads; +#else +#define force_irqthreads (0) +#endif + #ifndef __ARCH_SET_SOFTIRQ_PENDING #define set_softirq_pending(x) (local_softirq_pending() = (x)) #define or_softirq_pending(x) (local_softirq_pending() |= (x)) @@ -653,6 +689,7 @@ static inline void init_irq_proc(void) struct seq_file; int show_interrupts(struct seq_file *p, void *v); +int arch_show_interrupts(struct seq_file *p, int prec); extern int early_irq_init(void); extern int arch_probe_nr_irqs(void); diff --git a/include/linux/irq.h b/include/linux/irq.h index 80fcb53057b..1d3577f30d4 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -29,61 +29,104 @@ #include <asm/irq_regs.h> struct irq_desc; +struct irq_data; typedef void (*irq_flow_handler_t)(unsigned int irq, struct irq_desc *desc); - +typedef void (*irq_preflow_handler_t)(struct irq_data *data); /* * IRQ line status. * - * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h + * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h + * + * IRQ_TYPE_NONE - default, unspecified type + * IRQ_TYPE_EDGE_RISING - rising edge triggered + * IRQ_TYPE_EDGE_FALLING - falling edge triggered + * IRQ_TYPE_EDGE_BOTH - rising and falling edge triggered + * IRQ_TYPE_LEVEL_HIGH - high level triggered + * IRQ_TYPE_LEVEL_LOW - low level triggered + * IRQ_TYPE_LEVEL_MASK - Mask to filter out the level bits + * IRQ_TYPE_SENSE_MASK - Mask for all the above bits + * IRQ_TYPE_PROBE - Special flag for probing in progress + * + * Bits which can be modified via irq_set/clear/modify_status_flags() + * IRQ_LEVEL - Interrupt is level type. Will be also + * updated in the code when the above trigger + * bits are modified via set_irq_type() + * IRQ_PER_CPU - Mark an interrupt PER_CPU. Will protect + * it from affinity setting + * IRQ_NOPROBE - Interrupt cannot be probed by autoprobing + * IRQ_NOREQUEST - Interrupt cannot be requested via + * request_irq() + * IRQ_NOAUTOEN - Interrupt is not automatically enabled in + * request/setup_irq() + * IRQ_NO_BALANCING - Interrupt cannot be balanced (affinity set) + * IRQ_MOVE_PCNTXT - Interrupt can be migrated from process context + * IRQ_NESTED_TRHEAD - Interrupt nests into another thread + * + * Deprecated bits. They are kept updated as long as + * CONFIG_GENERIC_HARDIRQS_NO_COMPAT is not set. Will go away soon. These bits + * are internal state of the core code and if you really need to acces + * them then talk to the genirq maintainer instead of hacking + * something weird. * - * IRQ types */ -#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */ -#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */ -#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */ -#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) -#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */ -#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */ -#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */ -#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */ - -/* Internal flags */ -#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */ -#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */ -#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */ -#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */ -#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */ -#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */ -#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */ -#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */ -#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */ -#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */ -#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */ -#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */ -#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */ -#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ -#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ -#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ -#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */ -#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/ -#define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */ -#define IRQ_ONESHOT 0x08000000 /* IRQ is not unmasked after hardirq */ -#define IRQ_NESTED_THREAD 0x10000000 /* IRQ is nested into another, no own handler thread */ +enum { + IRQ_TYPE_NONE = 0x00000000, + IRQ_TYPE_EDGE_RISING = 0x00000001, + IRQ_TYPE_EDGE_FALLING = 0x00000002, + IRQ_TYPE_EDGE_BOTH = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING), + IRQ_TYPE_LEVEL_HIGH = 0x00000004, + IRQ_TYPE_LEVEL_LOW = 0x00000008, + IRQ_TYPE_LEVEL_MASK = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH), + IRQ_TYPE_SENSE_MASK = 0x0000000f, + + IRQ_TYPE_PROBE = 0x00000010, + + IRQ_LEVEL = (1 << 8), + IRQ_PER_CPU = (1 << 9), + IRQ_NOPROBE = (1 << 10), + IRQ_NOREQUEST = (1 << 11), + IRQ_NOAUTOEN = (1 << 12), + IRQ_NO_BALANCING = (1 << 13), + IRQ_MOVE_PCNTXT = (1 << 14), + IRQ_NESTED_THREAD = (1 << 15), + +#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT + IRQ_INPROGRESS = (1 << 16), + IRQ_REPLAY = (1 << 17), + IRQ_WAITING = (1 << 18), + IRQ_DISABLED = (1 << 19), + IRQ_PENDING = (1 << 20), + IRQ_MASKED = (1 << 21), + IRQ_MOVE_PENDING = (1 << 22), + IRQ_AFFINITY_SET = (1 << 23), + IRQ_WAKEUP = (1 << 24), +#endif +}; #define IRQF_MODIFY_MASK \ (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \ IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \ - IRQ_PER_CPU) + IRQ_PER_CPU | IRQ_NESTED_THREAD) -#ifdef CONFIG_IRQ_PER_CPU -# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) -# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) -#else -# define CHECK_IRQ_PER_CPU(var) 0 -# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING -#endif +#define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) + +static inline __deprecated bool CHECK_IRQ_PER_CPU(unsigned int status) +{ + return status & IRQ_PER_CPU; +} + +/* + * Return value for chip->irq_set_affinity() + * + * IRQ_SET_MASK_OK - OK, core updates irq_data.affinity + * IRQ_SET_MASK_NOCPY - OK, chip did update irq_data.affinity + */ +enum { + IRQ_SET_MASK_OK = 0, + IRQ_SET_MASK_OK_NOCOPY, +}; struct msi_desc; @@ -91,6 +134,8 @@ struct msi_desc; * struct irq_data - per irq and irq chip data passed down to chip functions * @irq: interrupt number * @node: node index useful for balancing + * @state_use_accessor: status information for irq chip functions. + * Use accessor functions to deal with it * @chip: low level interrupt hardware access * @handler_data: per-IRQ data for the irq_chip methods * @chip_data: platform-specific per-chip private data for the chip @@ -105,6 +150,7 @@ struct msi_desc; struct irq_data { unsigned int irq; unsigned int node; + unsigned int state_use_accessors; struct irq_chip *chip; void *handler_data; void *chip_data; @@ -114,6 +160,80 @@ struct irq_data { #endif }; +/* + * Bit masks for irq_data.state + * + * IRQD_TRIGGER_MASK - Mask for the trigger type bits + * IRQD_SETAFFINITY_PENDING - Affinity setting is pending + * IRQD_NO_BALANCING - Balancing disabled for this IRQ + * IRQD_PER_CPU - Interrupt is per cpu + * IRQD_AFFINITY_SET - Interrupt affinity was set + * IRQD_LEVEL - Interrupt is level triggered + * IRQD_WAKEUP_STATE - Interrupt is configured for wakeup + * from suspend + * IRDQ_MOVE_PCNTXT - Interrupt can be moved in process + * context + */ +enum { + IRQD_TRIGGER_MASK = 0xf, + IRQD_SETAFFINITY_PENDING = (1 << 8), + IRQD_NO_BALANCING = (1 << 10), + IRQD_PER_CPU = (1 << 11), + IRQD_AFFINITY_SET = (1 << 12), + IRQD_LEVEL = (1 << 13), + IRQD_WAKEUP_STATE = (1 << 14), + IRQD_MOVE_PCNTXT = (1 << 15), +}; + +static inline bool irqd_is_setaffinity_pending(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_SETAFFINITY_PENDING; +} + +static inline bool irqd_is_per_cpu(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_PER_CPU; +} + +static inline bool irqd_can_balance(struct irq_data *d) +{ + return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING)); +} + +static inline bool irqd_affinity_was_set(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_AFFINITY_SET; +} + +static inline u32 irqd_get_trigger_type(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_TRIGGER_MASK; +} + +/* + * Must only be called inside irq_chip.irq_set_type() functions. + */ +static inline void irqd_set_trigger_type(struct irq_data *d, u32 type) +{ + d->state_use_accessors &= ~IRQD_TRIGGER_MASK; + d->state_use_accessors |= type & IRQD_TRIGGER_MASK; +} + +static inline bool irqd_is_level_type(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_LEVEL; +} + +static inline bool irqd_is_wakeup_set(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_WAKEUP_STATE; +} + +static inline bool irqd_can_move_in_process_context(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_MOVE_PCNTXT; +} + /** * struct irq_chip - hardware interrupt chip descriptor * @@ -150,6 +270,7 @@ struct irq_data { * @irq_set_wake: enable/disable power-management wake-on of an IRQ * @irq_bus_lock: function to lock access to slow bus (i2c) chips * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips + * @flags: chip specific flags * * @release: release function solely used by UML */ @@ -196,12 +317,27 @@ struct irq_chip { void (*irq_bus_lock)(struct irq_data *data); void (*irq_bus_sync_unlock)(struct irq_data *data); + unsigned long flags; + /* Currently used only by UML, might disappear one day.*/ #ifdef CONFIG_IRQ_RELEASE_METHOD void (*release)(unsigned int irq, void *dev_id); #endif }; +/* + * irq_chip specific flags + * + * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type() + * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled + * IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path + */ +enum { + IRQCHIP_SET_TYPE_MASKED = (1 << 0), + IRQCHIP_EOI_IF_HANDLED = (1 << 1), + IRQCHIP_MASK_ON_SUSPEND = (1 << 2), +}; + /* This include will go away once we isolated irq_desc usage to core code */ #include <linux/irqdesc.h> @@ -218,7 +354,7 @@ struct irq_chip { # define ARCH_IRQ_INIT_FLAGS 0 #endif -#define IRQ_DEFAULT_INIT_FLAGS (IRQ_DISABLED | ARCH_IRQ_INIT_FLAGS) +#define IRQ_DEFAULT_INIT_FLAGS ARCH_IRQ_INIT_FLAGS struct irqaction; extern int setup_irq(unsigned int irq, struct irqaction *new); @@ -229,9 +365,13 @@ extern void remove_irq(unsigned int irq, struct irqaction *act); #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ) void move_native_irq(int irq); void move_masked_irq(int irq); +void irq_move_irq(struct irq_data *data); +void irq_move_masked_irq(struct irq_data *data); #else static inline void move_native_irq(int irq) { } static inline void move_masked_irq(int irq) { } +static inline void irq_move_irq(struct irq_data *data) { } +static inline void irq_move_masked_irq(struct irq_data *data) { } #endif extern int no_irq_affinity; @@ -267,23 +407,23 @@ extern struct irq_chip no_irq_chip; extern struct irq_chip dummy_irq_chip; extern void -set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, - irq_flow_handler_t handle); -extern void -set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, +irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, irq_flow_handler_t handle, const char *name); +static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip, + irq_flow_handler_t handle) +{ + irq_set_chip_and_handler_name(irq, chip, handle, NULL); +} + extern void -__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, +__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, const char *name); -/* - * Set a highlevel flow handler for a given IRQ: - */ static inline void -set_irq_handler(unsigned int irq, irq_flow_handler_t handle) +irq_set_handler(unsigned int irq, irq_flow_handler_t handle) { - __set_irq_handler(irq, handle, 0, NULL); + __irq_set_handler(irq, handle, 0, NULL); } /* @@ -292,14 +432,11 @@ set_irq_handler(unsigned int irq, irq_flow_handler_t handle) * IRQ_NOREQUEST and IRQ_NOPROBE) */ static inline void -set_irq_chained_handler(unsigned int irq, - irq_flow_handler_t handle) +irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle) { - __set_irq_handler(irq, handle, 1, NULL); + __irq_set_handler(irq, handle, 1, NULL); } -extern void set_irq_nested_thread(unsigned int irq, int nest); - void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set); static inline void irq_set_status_flags(unsigned int irq, unsigned long set) @@ -312,16 +449,24 @@ static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr) irq_modify_status(irq, clr, 0); } -static inline void set_irq_noprobe(unsigned int irq) +static inline void irq_set_noprobe(unsigned int irq) { irq_modify_status(irq, 0, IRQ_NOPROBE); } -static inline void set_irq_probe(unsigned int irq) +static inline void irq_set_probe(unsigned int irq) { irq_modify_status(irq, IRQ_NOPROBE, 0); } +static inline void irq_set_nested_thread(unsigned int irq, bool nest) +{ + if (nest) + irq_set_status_flags(irq, IRQ_NESTED_THREAD); + else + irq_clear_status_flags(irq, IRQ_NESTED_THREAD); +} + /* Handle dynamic irq creation and destruction */ extern unsigned int create_irq_nr(unsigned int irq_want, int node); extern int create_irq(void); @@ -338,14 +483,14 @@ static inline void dynamic_irq_init(unsigned int irq) } /* Set/get chip/data for an IRQ: */ -extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); -extern int set_irq_data(unsigned int irq, void *data); -extern int set_irq_chip_data(unsigned int irq, void *data); -extern int set_irq_type(unsigned int irq, unsigned int type); -extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); +extern int irq_set_chip(unsigned int irq, struct irq_chip *chip); +extern int irq_set_handler_data(unsigned int irq, void *data); +extern int irq_set_chip_data(unsigned int irq, void *data); +extern int irq_set_irq_type(unsigned int irq, unsigned int type); +extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry); extern struct irq_data *irq_get_irq_data(unsigned int irq); -static inline struct irq_chip *get_irq_chip(unsigned int irq) +static inline struct irq_chip *irq_get_chip(unsigned int irq) { struct irq_data *d = irq_get_irq_data(irq); return d ? d->chip : NULL; @@ -356,7 +501,7 @@ static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d) return d->chip; } -static inline void *get_irq_chip_data(unsigned int irq) +static inline void *irq_get_chip_data(unsigned int irq) { struct irq_data *d = irq_get_irq_data(irq); return d ? d->chip_data : NULL; @@ -367,18 +512,18 @@ static inline void *irq_data_get_irq_chip_data(struct irq_data *d) return d->chip_data; } -static inline void *get_irq_data(unsigned int irq) +static inline void *irq_get_handler_data(unsigned int irq) { struct irq_data *d = irq_get_irq_data(irq); return d ? d->handler_data : NULL; } -static inline void *irq_data_get_irq_data(struct irq_data *d) +static inline void *irq_data_get_irq_handler_data(struct irq_data *d) { return d->handler_data; } -static inline struct msi_desc *get_irq_msi(unsigned int irq) +static inline struct msi_desc *irq_get_msi_desc(unsigned int irq) { struct irq_data *d = irq_get_irq_data(irq); return d ? d->msi_desc : NULL; @@ -389,6 +534,89 @@ static inline struct msi_desc *irq_data_get_msi(struct irq_data *d) return d->msi_desc; } +#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT +/* Please do not use: Use the replacement functions instead */ +static inline int set_irq_chip(unsigned int irq, struct irq_chip *chip) +{ + return irq_set_chip(irq, chip); +} +static inline int set_irq_data(unsigned int irq, void *data) +{ + return irq_set_handler_data(irq, data); +} +static inline int set_irq_chip_data(unsigned int irq, void *data) +{ + return irq_set_chip_data(irq, data); +} +static inline int set_irq_type(unsigned int irq, unsigned int type) +{ + return irq_set_irq_type(irq, type); +} +static inline int set_irq_msi(unsigned int irq, struct msi_desc *entry) +{ + return irq_set_msi_desc(irq, entry); +} +static inline struct irq_chip *get_irq_chip(unsigned int irq) +{ + return irq_get_chip(irq); +} +static inline void *get_irq_chip_data(unsigned int irq) +{ + return irq_get_chip_data(irq); +} +static inline void *get_irq_data(unsigned int irq) +{ + return irq_get_handler_data(irq); +} +static inline void *irq_data_get_irq_data(struct irq_data *d) +{ + return irq_data_get_irq_handler_data(d); +} +static inline struct msi_desc *get_irq_msi(unsigned int irq) +{ + return irq_get_msi_desc(irq); +} +static inline void set_irq_noprobe(unsigned int irq) +{ + irq_set_noprobe(irq); +} +static inline void set_irq_probe(unsigned int irq) +{ + irq_set_probe(irq); +} +static inline void set_irq_nested_thread(unsigned int irq, int nest) +{ + irq_set_nested_thread(irq, nest); +} +static inline void +set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, + irq_flow_handler_t handle, const char *name) +{ + irq_set_chip_and_handler_name(irq, chip, handle, name); +} +static inline void +set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, + irq_flow_handler_t handle) +{ + irq_set_chip_and_handler(irq, chip, handle); +} +static inline void +__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, + const char *name) +{ + __irq_set_handler(irq, handle, is_chained, name); +} +static inline void set_irq_handler(unsigned int irq, irq_flow_handler_t handle) +{ + irq_set_handler(irq, handle); +} +static inline void +set_irq_chained_handler(unsigned int irq, irq_flow_handler_t handle) +{ + irq_set_chained_handler(irq, handle); +} +#endif + int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node); void irq_free_descs(unsigned int irq, unsigned int cnt); int irq_reserve_irqs(unsigned int from, unsigned int cnt); diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h index c1a95b7b58d..00218371518 100644 --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -8,6 +8,7 @@ * For now it's included from <linux/irq.h> */ +struct irq_affinity_notify; struct proc_dir_entry; struct timer_rand_state; /** @@ -18,13 +19,16 @@ struct timer_rand_state; * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] * @action: the irq action chain * @status: status information + * @core_internal_state__do_not_mess_with_it: core internal status information * @depth: disable-depth, for nested irq_disable() calls * @wake_depth: enable depth, for multiple set_irq_wake() callers * @irq_count: stats field to detect stalled irqs * @last_unhandled: aging timer for unhandled count * @irqs_unhandled: stats field for spurious unhandled interrupts * @lock: locking for SMP + * @affinity_notify: context for notification of affinity changes * @pending_mask: pending rebalanced interrupts + * @threads_oneshot: bitfield to handle shared oneshot threads * @threads_active: number of irqaction threads currently running * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers * @dir: /proc/irq/ procfs entry @@ -45,6 +49,7 @@ struct irq_desc { struct { unsigned int irq; unsigned int node; + unsigned int pad_do_not_even_think_about_it; struct irq_chip *chip; void *handler_data; void *chip_data; @@ -59,9 +64,16 @@ struct irq_desc { struct timer_rand_state *timer_rand_state; unsigned int __percpu *kstat_irqs; irq_flow_handler_t handle_irq; +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI + irq_preflow_handler_t preflow_handler; +#endif struct irqaction *action; /* IRQ action list */ +#ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT + unsigned int status_use_accessors; +#else unsigned int status; /* IRQ status */ - +#endif + unsigned int core_internal_state__do_not_mess_with_it; unsigned int depth; /* nested irq disables */ unsigned int wake_depth; /* nested wake enables */ unsigned int irq_count; /* For detecting broken IRQs */ @@ -70,10 +82,12 @@ struct irq_desc { raw_spinlock_t lock; #ifdef CONFIG_SMP const struct cpumask *affinity_hint; + struct irq_affinity_notify *affinity_notify; #ifdef CONFIG_GENERIC_PENDING_IRQ cpumask_var_t pending_mask; #endif #endif + unsigned long threads_oneshot; atomic_t threads_active; wait_queue_head_t wait_for_threads; #ifdef CONFIG_PROC_FS @@ -95,10 +109,51 @@ static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node) #ifdef CONFIG_GENERIC_HARDIRQS -#define get_irq_desc_chip(desc) ((desc)->irq_data.chip) -#define get_irq_desc_chip_data(desc) ((desc)->irq_data.chip_data) -#define get_irq_desc_data(desc) ((desc)->irq_data.handler_data) -#define get_irq_desc_msi(desc) ((desc)->irq_data.msi_desc) +static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) +{ + return &desc->irq_data; +} + +static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) +{ + return desc->irq_data.chip; +} + +static inline void *irq_desc_get_chip_data(struct irq_desc *desc) +{ + return desc->irq_data.chip_data; +} + +static inline void *irq_desc_get_handler_data(struct irq_desc *desc) +{ + return desc->irq_data.handler_data; +} + +static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) +{ + return desc->irq_data.msi_desc; +} + +#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT +static inline struct irq_chip *get_irq_desc_chip(struct irq_desc *desc) +{ + return irq_desc_get_chip(desc); +} +static inline void *get_irq_desc_data(struct irq_desc *desc) +{ + return irq_desc_get_handler_data(desc); +} + +static inline void *get_irq_desc_chip_data(struct irq_desc *desc) +{ + return irq_desc_get_chip_data(desc); +} + +static inline struct msi_desc *get_irq_desc_msi(struct irq_desc *desc) +{ + return irq_desc_get_msi_desc(desc); +} +#endif /* * Architectures call this to let the generic IRQ layer @@ -123,6 +178,7 @@ static inline int irq_has_action(unsigned int irq) return desc->action != NULL; } +#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT static inline int irq_balancing_disabled(unsigned int irq) { struct irq_desc *desc; @@ -130,6 +186,7 @@ static inline int irq_balancing_disabled(unsigned int irq) desc = irq_to_desc(irq); return desc->status & IRQ_NO_BALANCING_MASK; } +#endif /* caller has locked the irq_desc and both params are valid */ static inline void __set_irq_handler_unlocked(int irq, @@ -140,6 +197,17 @@ static inline void __set_irq_handler_unlocked(int irq, desc = irq_to_desc(irq); desc->handle_irq = handler; } + +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI +static inline void +__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + desc->preflow_handler = handler; +} +#endif #endif #endif diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 8e42fec7686..09bef82d74c 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -1,5 +1,6 @@ +# Select this to activate the generic irq options below config HAVE_GENERIC_HARDIRQS - def_bool n + bool if HAVE_GENERIC_HARDIRQS menu "IRQ subsystem" @@ -11,26 +12,44 @@ config GENERIC_HARDIRQS # Select this to disable the deprecated stuff config GENERIC_HARDIRQS_NO_DEPRECATED - def_bool n + bool + +config GENERIC_HARDIRQS_NO_COMPAT + bool # Options selectable by the architecture code + +# Make sparse irq Kconfig switch below available config HAVE_SPARSE_IRQ - def_bool n + bool +# Enable the generic irq autoprobe mechanism config GENERIC_IRQ_PROBE - def_bool n + bool + +# Use the generic /proc/interrupts implementation +config GENERIC_IRQ_SHOW + bool +# Support for delayed migration from interrupt context config GENERIC_PENDING_IRQ - def_bool n + bool +# Alpha specific irq affinity mechanism config AUTO_IRQ_AFFINITY - def_bool n - -config IRQ_PER_CPU - def_bool n + bool +# Tasklet based software resend for pending interrupts on enable_irq() config HARDIRQS_SW_RESEND - def_bool n + bool + +# Preflow handler support for fasteoi (sparc64) +config IRQ_PREFLOW_FASTEOI + bool + +# Support forced irq threading +config IRQ_FORCED_THREADING + bool config SPARSE_IRQ bool "Support sparse irq numbering" diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c index 505798f86c3..394784c5706 100644 --- a/kernel/irq/autoprobe.c +++ b/kernel/irq/autoprobe.c @@ -17,7 +17,7 @@ /* * Autodetection depends on the fact that any interrupt that * comes in on to an unassigned handler will get stuck with - * "IRQ_WAITING" cleared and the interrupt disabled. + * "IRQS_WAITING" cleared and the interrupt disabled. */ static DEFINE_MUTEX(probing_active); @@ -32,7 +32,6 @@ unsigned long probe_irq_on(void) { struct irq_desc *desc; unsigned long mask = 0; - unsigned int status; int i; /* @@ -46,13 +45,7 @@ unsigned long probe_irq_on(void) */ for_each_irq_desc_reverse(i, desc) { raw_spin_lock_irq(&desc->lock); - if (!desc->action && !(desc->status & IRQ_NOPROBE)) { - /* - * An old-style architecture might still have - * the handle_bad_irq handler there: - */ - compat_irq_chip_set_default_handler(desc); - + if (!desc->action && irq_settings_can_probe(desc)) { /* * Some chips need to know about probing in * progress: @@ -60,7 +53,7 @@ unsigned long probe_irq_on(void) if (desc->irq_data.chip->irq_set_type) desc->irq_data.chip->irq_set_type(&desc->irq_data, IRQ_TYPE_PROBE); - desc->irq_data.chip->irq_startup(&desc->irq_data); + irq_startup(desc); } raw_spin_unlock_irq(&desc->lock); } @@ -75,10 +68,12 @@ unsigned long probe_irq_on(void) */ for_each_irq_desc_reverse(i, desc) { raw_spin_lock_irq(&desc->lock); - if (!desc->action && !(desc->status & IRQ_NOPROBE)) { - desc->status |= IRQ_AUTODETECT | IRQ_WAITING; - if (desc->irq_data.chip->irq_startup(&desc->irq_data)) - desc->status |= IRQ_PENDING; + if (!desc->action && irq_settings_can_probe(desc)) { + desc->istate |= IRQS_AUTODETECT | IRQS_WAITING; + if (irq_startup(desc)) { + irq_compat_set_pending(desc); + desc->istate |= IRQS_PENDING; + } } raw_spin_unlock_irq(&desc->lock); } @@ -93,13 +88,12 @@ unsigned long probe_irq_on(void) */ for_each_irq_desc(i, desc) { raw_spin_lock_irq(&desc->lock); - status = desc->status; - if (status & IRQ_AUTODETECT) { + if (desc->istate & IRQS_AUTODETECT) { /* It triggered already - consider it spurious. */ - if (!(status & IRQ_WAITING)) { - desc->status = status & ~IRQ_AUTODETECT; - desc->irq_data.chip->irq_shutdown(&desc->irq_data); + if (!(desc->istate & IRQS_WAITING)) { + desc->istate &= ~IRQS_AUTODETECT; + irq_shutdown(desc); } else if (i < 32) mask |= 1 << i; @@ -125,20 +119,18 @@ EXPORT_SYMBOL(probe_irq_on); */ unsigned int probe_irq_mask(unsigned long val) { - unsigned int status, mask = 0; + unsigned int mask = 0; struct irq_desc *desc; int i; for_each_irq_desc(i, desc) { raw_spin_lock_irq(&desc->lock); - status = desc->status; - - if (status & IRQ_AUTODETECT) { - if (i < 16 && !(status & IRQ_WAITING)) + if (desc->istate & IRQS_AUTODETECT) { + if (i < 16 && !(desc->istate & IRQS_WAITING)) mask |= 1 << i; - desc->status = status & ~IRQ_AUTODETECT; - desc->irq_data.chip->irq_shutdown(&desc->irq_data); + desc->istate &= ~IRQS_AUTODETECT; + irq_shutdown(desc); } raw_spin_unlock_irq(&desc->lock); } @@ -169,20 +161,18 @@ int probe_irq_off(unsigned long val) { int i, irq_found = 0, nr_of_irqs = 0; struct irq_desc *desc; - unsigned int status; for_each_irq_desc(i, desc) { raw_spin_lock_irq(&desc->lock); - status = desc->status; - if (status & IRQ_AUTODETECT) { - if (!(status & IRQ_WAITING)) { + if (desc->istate & IRQS_AUTODETECT) { + if (!(desc->istate & IRQS_WAITING)) { if (!nr_of_irqs) irq_found = i; nr_of_irqs++; } - desc->status = status & ~IRQ_AUTODETECT; - desc->irq_data.chip->irq_shutdown(&desc->irq_data); + desc->istate &= ~IRQS_AUTODETECT; + irq_shutdown(desc); } raw_spin_unlock_irq(&desc->lock); } diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index baa5c4acad8..c9c0601f061 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -19,140 +19,110 @@ #include "internals.h" /** - * set_irq_chip - set the irq chip for an irq + * irq_set_chip - set the irq chip for an irq * @irq: irq number * @chip: pointer to irq chip description structure */ -int set_irq_chip(unsigned int irq, struct irq_chip *chip) +int irq_set_chip(unsigned int irq, struct irq_chip *chip) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); - if (!desc) { - WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq); + if (!desc) return -EINVAL; - } if (!chip) chip = &no_irq_chip; - raw_spin_lock_irqsave(&desc->lock, flags); irq_chip_set_defaults(chip); desc->irq_data.chip = chip; - raw_spin_unlock_irqrestore(&desc->lock, flags); - + irq_put_desc_unlock(desc, flags); return 0; } -EXPORT_SYMBOL(set_irq_chip); +EXPORT_SYMBOL(irq_set_chip); /** - * set_irq_type - set the irq trigger type for an irq + * irq_set_type - set the irq trigger type for an irq * @irq: irq number * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h */ -int set_irq_type(unsigned int irq, unsigned int type) +int irq_set_irq_type(unsigned int irq, unsigned int type) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; - int ret = -ENXIO; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); + int ret = 0; - if (!desc) { - printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq); - return -ENODEV; - } + if (!desc) + return -EINVAL; type &= IRQ_TYPE_SENSE_MASK; - if (type == IRQ_TYPE_NONE) - return 0; - - raw_spin_lock_irqsave(&desc->lock, flags); - ret = __irq_set_trigger(desc, irq, type); - raw_spin_unlock_irqrestore(&desc->lock, flags); + if (type != IRQ_TYPE_NONE) + ret = __irq_set_trigger(desc, irq, type); + irq_put_desc_busunlock(desc, flags); return ret; } -EXPORT_SYMBOL(set_irq_type); +EXPORT_SYMBOL(irq_set_irq_type); /** - * set_irq_data - set irq type data for an irq + * irq_set_handler_data - set irq handler data for an irq * @irq: Interrupt number * @data: Pointer to interrupt specific data * * Set the hardware irq controller data for an irq */ -int set_irq_data(unsigned int irq, void *data) +int irq_set_handler_data(unsigned int irq, void *data) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); - if (!desc) { - printk(KERN_ERR - "Trying to install controller data for IRQ%d\n", irq); + if (!desc) return -EINVAL; - } - - raw_spin_lock_irqsave(&desc->lock, flags); desc->irq_data.handler_data = data; - raw_spin_unlock_irqrestore(&desc->lock, flags); + irq_put_desc_unlock(desc, flags); return 0; } -EXPORT_SYMBOL(set_irq_data); +EXPORT_SYMBOL(irq_set_handler_data); /** - * set_irq_msi - set MSI descriptor data for an irq + * irq_set_msi_desc - set MSI descriptor data for an irq * @irq: Interrupt number * @entry: Pointer to MSI descriptor data * * Set the MSI descriptor entry for an irq */ -int set_irq_msi(unsigned int irq, struct msi_desc *entry) +int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); - if (!desc) { - printk(KERN_ERR - "Trying to install msi data for IRQ%d\n", irq); + if (!desc) return -EINVAL; - } - - raw_spin_lock_irqsave(&desc->lock, flags); desc->irq_data.msi_desc = entry; if (entry) entry->irq = irq; - raw_spin_unlock_irqrestore(&desc->lock, flags); + irq_put_desc_unlock(desc, flags); return 0; } /** - * set_irq_chip_data - set irq chip data for an irq + * irq_set_chip_data - set irq chip data for an irq * @irq: Interrupt number * @data: Pointer to chip specific data * * Set the hardware irq chip data for an irq */ -int set_irq_chip_data(unsigned int irq, void *data) +int irq_set_chip_data(unsigned int irq, void *data) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); - if (!desc) { - printk(KERN_ERR - "Trying to install chip data for IRQ%d\n", irq); - return -EINVAL; - } - - if (!desc->irq_data.chip) { - printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq); + if (!desc) return -EINVAL; - } - - raw_spin_lock_irqsave(&desc->lock, flags); desc->irq_data.chip_data = data; - raw_spin_unlock_irqrestore(&desc->lock, flags); - + irq_put_desc_unlock(desc, flags); return 0; } -EXPORT_SYMBOL(set_irq_chip_data); +EXPORT_SYMBOL(irq_set_chip_data); struct irq_data *irq_get_irq_data(unsigned int irq) { @@ -162,72 +132,75 @@ struct irq_data *irq_get_irq_data(unsigned int irq) } EXPORT_SYMBOL_GPL(irq_get_irq_data); -/** - * set_irq_nested_thread - Set/Reset the IRQ_NESTED_THREAD flag of an irq - * - * @irq: Interrupt number - * @nest: 0 to clear / 1 to set the IRQ_NESTED_THREAD flag - * - * The IRQ_NESTED_THREAD flag indicates that on - * request_threaded_irq() no separate interrupt thread should be - * created for the irq as the handler are called nested in the - * context of a demultiplexing interrupt handler thread. - */ -void set_irq_nested_thread(unsigned int irq, int nest) +static void irq_state_clr_disabled(struct irq_desc *desc) { - struct irq_desc *desc = irq_to_desc(irq); - unsigned long flags; - - if (!desc) - return; - - raw_spin_lock_irqsave(&desc->lock, flags); - if (nest) - desc->status |= IRQ_NESTED_THREAD; - else - desc->status &= ~IRQ_NESTED_THREAD; - raw_spin_unlock_irqrestore(&desc->lock, flags); + desc->istate &= ~IRQS_DISABLED; + irq_compat_clr_disabled(desc); } -EXPORT_SYMBOL_GPL(set_irq_nested_thread); -/* - * default enable function - */ -static void default_enable(struct irq_data *data) +static void irq_state_set_disabled(struct irq_desc *desc) { - struct irq_desc *desc = irq_data_to_desc(data); + desc->istate |= IRQS_DISABLED; + irq_compat_set_disabled(desc); +} - desc->irq_data.chip->irq_unmask(&desc->irq_data); - desc->status &= ~IRQ_MASKED; +static void irq_state_clr_masked(struct irq_desc *desc) +{ + desc->istate &= ~IRQS_MASKED; + irq_compat_clr_masked(desc); } -/* - * default disable function - */ -static void default_disable(struct irq_data *data) +static void irq_state_set_masked(struct irq_desc *desc) { + desc->istate |= IRQS_MASKED; + irq_compat_set_masked(desc); } -/* - * default startup function - */ -static unsigned int default_startup(struct irq_data *data) +int irq_startup(struct irq_desc *desc) { - struct irq_desc *desc = irq_data_to_desc(data); + irq_state_clr_disabled(desc); + desc->depth = 0; + + if (desc->irq_data.chip->irq_startup) { + int ret = desc->irq_data.chip->irq_startup(&desc->irq_data); + irq_state_clr_masked(desc); + return ret; + } - desc->irq_data.chip->irq_enable(data); + irq_enable(desc); return 0; } -/* - * default shutdown function - */ -static void default_shutdown(struct irq_data *data) +void irq_shutdown(struct irq_desc *desc) { - struct irq_desc *desc = irq_data_to_desc(data); + irq_state_set_disabled(desc); + desc->depth = 1; + if (desc->irq_data.chip->irq_shutdown) + desc->irq_data.chip->irq_shutdown(&desc->irq_data); + if (desc->irq_data.chip->irq_disable) + desc->irq_data.chip->irq_disable(&desc->irq_data); + else + desc->irq_data.chip->irq_mask(&desc->irq_data); + irq_state_set_masked(desc); +} - desc->irq_data.chip->irq_mask(&desc->irq_data); - desc->status |= IRQ_MASKED; +void irq_enable(struct irq_desc *desc) +{ + irq_state_clr_disabled(desc); + if (desc->irq_data.chip->irq_enable) + desc->irq_data.chip->irq_enable(&desc->irq_data); + else + desc->irq_data.chip->irq_unmask(&desc->irq_data); + irq_state_clr_masked(desc); +} + +void irq_disable(struct irq_desc *desc) +{ + irq_state_set_disabled(desc); + if (desc->irq_data.chip->irq_disable) { + desc->irq_data.chip->irq_disable(&desc->irq_data); + irq_state_set_masked(desc); + } } #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED @@ -315,10 +288,6 @@ static void compat_bus_sync_unlock(struct irq_data *data) void irq_chip_set_defaults(struct irq_chip *chip) { #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED - /* - * Compat fixup functions need to be before we set the - * defaults for enable/disable/startup/shutdown - */ if (chip->enable) chip->irq_enable = compat_irq_enable; if (chip->disable) @@ -327,33 +296,8 @@ void irq_chip_set_defaults(struct irq_chip *chip) chip->irq_shutdown = compat_irq_shutdown; if (chip->startup) chip->irq_startup = compat_irq_startup; -#endif - /* - * The real defaults - */ - if (!chip->irq_enable) - chip->irq_enable = default_enable; - if (!chip->irq_disable) - chip->irq_disable = default_disable; - if (!chip->irq_startup) - chip->irq_startup = default_startup; - /* - * We use chip->irq_disable, when the user provided its own. When - * we have default_disable set for chip->irq_disable, then we need - * to use default_shutdown, otherwise the irq line is not - * disabled on free_irq(): - */ - if (!chip->irq_shutdown) - chip->irq_shutdown = chip->irq_disable != default_disable ? - chip->irq_disable : default_shutdown; - -#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED if (!chip->end) chip->end = dummy_irq_chip.end; - - /* - * Now fix up the remaining compat handlers - */ if (chip->bus_lock) chip->irq_bus_lock = compat_bus_lock; if (chip->bus_sync_unlock) @@ -388,22 +332,22 @@ static inline void mask_ack_irq(struct irq_desc *desc) if (desc->irq_data.chip->irq_ack) desc->irq_data.chip->irq_ack(&desc->irq_data); } - desc->status |= IRQ_MASKED; + irq_state_set_masked(desc); } -static inline void mask_irq(struct irq_desc *desc) +void mask_irq(struct irq_desc *desc) { if (desc->irq_data.chip->irq_mask) { desc->irq_data.chip->irq_mask(&desc->irq_data); - desc->status |= IRQ_MASKED; + irq_state_set_masked(desc); } } -static inline void unmask_irq(struct irq_desc *desc) +void unmask_irq(struct irq_desc *desc) { if (desc->irq_data.chip->irq_unmask) { desc->irq_data.chip->irq_unmask(&desc->irq_data); - desc->status &= ~IRQ_MASKED; + irq_state_clr_masked(desc); } } @@ -428,10 +372,11 @@ void handle_nested_irq(unsigned int irq) kstat_incr_irqs_this_cpu(irq, desc); action = desc->action; - if (unlikely(!action || (desc->status & IRQ_DISABLED))) + if (unlikely(!action || (desc->istate & IRQS_DISABLED))) goto out_unlock; - desc->status |= IRQ_INPROGRESS; + irq_compat_set_progress(desc); + desc->istate |= IRQS_INPROGRESS; raw_spin_unlock_irq(&desc->lock); action_ret = action->thread_fn(action->irq, action->dev_id); @@ -439,13 +384,21 @@ void handle_nested_irq(unsigned int irq) note_interrupt(irq, desc, action_ret); raw_spin_lock_irq(&desc->lock); - desc->status &= ~IRQ_INPROGRESS; + desc->istate &= ~IRQS_INPROGRESS; + irq_compat_clr_progress(desc); out_unlock: raw_spin_unlock_irq(&desc->lock); } EXPORT_SYMBOL_GPL(handle_nested_irq); +static bool irq_check_poll(struct irq_desc *desc) +{ + if (!(desc->istate & IRQS_POLL_INPROGRESS)) + return false; + return irq_wait_for_poll(desc); +} + /** * handle_simple_irq - Simple and software-decoded IRQs. * @irq: the interrupt number @@ -461,29 +414,20 @@ EXPORT_SYMBOL_GPL(handle_nested_irq); void handle_simple_irq(unsigned int irq, struct irq_desc *desc) { - struct irqaction *action; - irqreturn_t action_ret; - raw_spin_lock(&desc->lock); - if (unlikely(desc->status & IRQ_INPROGRESS)) - goto out_unlock; - desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + if (unlikely(desc->istate & IRQS_INPROGRESS)) + if (!irq_check_poll(desc)) + goto out_unlock; + + desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING); kstat_incr_irqs_this_cpu(irq, desc); - action = desc->action; - if (unlikely(!action || (desc->status & IRQ_DISABLED))) + if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED))) goto out_unlock; - desc->status |= IRQ_INPROGRESS; - raw_spin_unlock(&desc->lock); + handle_irq_event(desc); - action_ret = handle_IRQ_event(irq, action); - if (!noirqdebug) - note_interrupt(irq, desc, action_ret); - - raw_spin_lock(&desc->lock); - desc->status &= ~IRQ_INPROGRESS; out_unlock: raw_spin_unlock(&desc->lock); } @@ -501,42 +445,42 @@ out_unlock: void handle_level_irq(unsigned int irq, struct irq_desc *desc) { - struct irqaction *action; - irqreturn_t action_ret; - raw_spin_lock(&desc->lock); mask_ack_irq(desc); - if (unlikely(desc->status & IRQ_INPROGRESS)) - goto out_unlock; - desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + if (unlikely(desc->istate & IRQS_INPROGRESS)) + if (!irq_check_poll(desc)) + goto out_unlock; + + desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING); kstat_incr_irqs_this_cpu(irq, desc); /* * If its disabled or no action available * keep it masked and get out of here */ - action = desc->action; - if (unlikely(!action || (desc->status & IRQ_DISABLED))) + if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED))) goto out_unlock; - desc->status |= IRQ_INPROGRESS; - raw_spin_unlock(&desc->lock); - - action_ret = handle_IRQ_event(irq, action); - if (!noirqdebug) - note_interrupt(irq, desc, action_ret); + handle_irq_event(desc); - raw_spin_lock(&desc->lock); - desc->status &= ~IRQ_INPROGRESS; - - if (!(desc->status & (IRQ_DISABLED | IRQ_ONESHOT))) + if (!(desc->istate & (IRQS_DISABLED | IRQS_ONESHOT))) unmask_irq(desc); out_unlock: raw_spin_unlock(&desc->lock); } EXPORT_SYMBOL_GPL(handle_level_irq); +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI +static inline void preflow_handler(struct irq_desc *desc) +{ + if (desc->preflow_handler) + desc->preflow_handler(&desc->irq_data); +} +#else +static inline void preflow_handler(struct irq_desc *desc) { } +#endif + /** * handle_fasteoi_irq - irq handler for transparent controllers * @irq: the interrupt number @@ -550,42 +494,41 @@ EXPORT_SYMBOL_GPL(handle_level_irq); void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) { - struct irqaction *action; - irqreturn_t action_ret; - raw_spin_lock(&desc->lock); - if (unlikely(desc->status & IRQ_INPROGRESS)) - goto out; + if (unlikely(desc->istate & IRQS_INPROGRESS)) + if (!irq_check_poll(desc)) + goto out; - desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING); kstat_incr_irqs_this_cpu(irq, desc); /* * If its disabled or no action available * then mask it and get out of here: */ - action = desc->action; - if (unlikely(!action || (desc->status & IRQ_DISABLED))) { - desc->status |= IRQ_PENDING; + if (unlikely(!desc->action || (desc->istate & IRQS_DISABLED))) { + irq_compat_set_pending(desc); + desc->istate |= IRQS_PENDING; mask_irq(desc); goto out; } - desc->status |= IRQ_INPROGRESS; - desc->status &= ~IRQ_PENDING; - raw_spin_unlock(&desc->lock); + if (desc->istate & IRQS_ONESHOT) + mask_irq(desc); - action_ret = handle_IRQ_event(irq, action); - if (!noirqdebug) - note_interrupt(irq, desc, action_ret); + preflow_handler(desc); + handle_irq_event(desc); - raw_spin_lock(&desc->lock); - desc->status &= ~IRQ_INPROGRESS; -out: +out_eoi: desc->irq_data.chip->irq_eoi(&desc->irq_data); - +out_unlock: raw_spin_unlock(&desc->lock); + return; +out: + if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED)) + goto out_eoi; + goto out_unlock; } /** @@ -609,32 +552,28 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc) { raw_spin_lock(&desc->lock); - desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); - + desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING); /* * If we're currently running this IRQ, or its disabled, * we shouldn't process the IRQ. Mark it pending, handle * the necessary masking and go out */ - if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) || - !desc->action)) { - desc->status |= (IRQ_PENDING | IRQ_MASKED); - mask_ack_irq(desc); - goto out_unlock; + if (unlikely((desc->istate & (IRQS_DISABLED | IRQS_INPROGRESS) || + !desc->action))) { + if (!irq_check_poll(desc)) { + irq_compat_set_pending(desc); + desc->istate |= IRQS_PENDING; + mask_ack_irq(desc); + goto out_unlock; + } } kstat_incr_irqs_this_cpu(irq, desc); /* Start handling the irq */ desc->irq_data.chip->irq_ack(&desc->irq_data); - /* Mark the IRQ currently in progress.*/ - desc->status |= IRQ_INPROGRESS; - do { - struct irqaction *action = desc->action; - irqreturn_t action_ret; - - if (unlikely(!action)) { + if (unlikely(!desc->action)) { mask_irq(desc); goto out_unlock; } @@ -644,22 +583,17 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc) * one, we could have masked the irq. * Renable it, if it was not disabled in meantime. */ - if (unlikely((desc->status & - (IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) == - (IRQ_PENDING | IRQ_MASKED))) { - unmask_irq(desc); + if (unlikely(desc->istate & IRQS_PENDING)) { + if (!(desc->istate & IRQS_DISABLED) && + (desc->istate & IRQS_MASKED)) + unmask_irq(desc); } - desc->status &= ~IRQ_PENDING; - raw_spin_unlock(&desc->lock); - action_ret = handle_IRQ_event(irq, action); - if (!noirqdebug) - note_interrupt(irq, desc, action_ret); - raw_spin_lock(&desc->lock); + handle_irq_event(desc); - } while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING); + } while ((desc->istate & IRQS_PENDING) && + !(desc->istate & IRQS_DISABLED)); - desc->status &= ~IRQ_INPROGRESS; out_unlock: raw_spin_unlock(&desc->lock); } @@ -674,103 +608,84 @@ out_unlock: void handle_percpu_irq(unsigned int irq, struct irq_desc *desc) { - irqreturn_t action_ret; + struct irq_chip *chip = irq_desc_get_chip(desc); kstat_incr_irqs_this_cpu(irq, desc); - if (desc->irq_data.chip->irq_ack) - desc->irq_data.chip->irq_ack(&desc->irq_data); + if (chip->irq_ack) + chip->irq_ack(&desc->irq_data); - action_ret = handle_IRQ_event(irq, desc->action); - if (!noirqdebug) - note_interrupt(irq, desc, action_ret); + handle_irq_event_percpu(desc, desc->action); - if (desc->irq_data.chip->irq_eoi) - desc->irq_data.chip->irq_eoi(&desc->irq_data); + if (chip->irq_eoi) + chip->irq_eoi(&desc->irq_data); } void -__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, +__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, const char *name) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); - if (!desc) { - printk(KERN_ERR - "Trying to install type control for IRQ%d\n", irq); + if (!desc) return; - } - if (!handle) + if (!handle) { handle = handle_bad_irq; - else if (desc->irq_data.chip == &no_irq_chip) { - printk(KERN_WARNING "Trying to install %sinterrupt handler " - "for IRQ%d\n", is_chained ? "chained " : "", irq); - /* - * Some ARM implementations install a handler for really dumb - * interrupt hardware without setting an irq_chip. This worked - * with the ARM no_irq_chip but the check in setup_irq would - * prevent us to setup the interrupt at all. Switch it to - * dummy_irq_chip for easy transition. - */ - desc->irq_data.chip = &dummy_irq_chip; + } else { + if (WARN_ON(desc->irq_data.chip == &no_irq_chip)) + goto out; } - chip_bus_lock(desc); - raw_spin_lock_irqsave(&desc->lock, flags); - /* Uninstall? */ if (handle == handle_bad_irq) { if (desc->irq_data.chip != &no_irq_chip) mask_ack_irq(desc); - desc->status |= IRQ_DISABLED; + irq_compat_set_disabled(desc); + desc->istate |= IRQS_DISABLED; desc->depth = 1; } desc->handle_irq = handle; desc->name = name; if (handle != handle_bad_irq && is_chained) { - desc->status &= ~IRQ_DISABLED; - desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE; - desc->depth = 0; - desc->irq_data.chip->irq_startup(&desc->irq_data); + irq_settings_set_noprobe(desc); + irq_settings_set_norequest(desc); + irq_startup(desc); } - raw_spin_unlock_irqrestore(&desc->lock, flags); - chip_bus_sync_unlock(desc); -} -EXPORT_SYMBOL_GPL(__set_irq_handler); - -void -set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, - irq_flow_handler_t handle) -{ - set_irq_chip(irq, chip); - __set_irq_handler(irq, handle, 0, NULL); +out: + irq_put_desc_busunlock(desc, flags); } +EXPORT_SYMBOL_GPL(__irq_set_handler); void -set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, +irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, irq_flow_handler_t handle, const char *name) { - set_irq_chip(irq, chip); - __set_irq_handler(irq, handle, 0, name); + irq_set_chip(irq, chip); + __irq_set_handler(irq, handle, 0, name); } void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); if (!desc) return; + irq_settings_clr_and_set(desc, clr, set); + + irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU | + IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT); + if (irq_settings_has_no_balance_set(desc)) + irqd_set(&desc->irq_data, IRQD_NO_BALANCING); + if (irq_settings_is_per_cpu(desc)) + irqd_set(&desc->irq_data, IRQD_PER_CPU); + if (irq_settings_can_move_pcntxt(desc)) + irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT); - /* Sanitize flags */ - set &= IRQF_MODIFY_MASK; - clr &= IRQF_MODIFY_MASK; + irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc)); - raw_spin_lock_irqsave(&desc->lock, flags); - desc->status &= ~clr; - desc->status |= set; - raw_spin_unlock_irqrestore(&desc->lock, flags); + irq_put_desc_unlock(desc, flags); } diff --git a/kernel/irq/compat.h b/kernel/irq/compat.h new file mode 100644 index 00000000000..6bbaf66aca8 --- /dev/null +++ b/kernel/irq/compat.h @@ -0,0 +1,72 @@ +/* + * Compat layer for transition period + */ +#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT +static inline void irq_compat_set_progress(struct irq_desc *desc) +{ + desc->status |= IRQ_INPROGRESS; +} + +static inline void irq_compat_clr_progress(struct irq_desc *desc) +{ + desc->status &= ~IRQ_INPROGRESS; +} +static inline void irq_compat_set_disabled(struct irq_desc *desc) +{ + desc->status |= IRQ_DISABLED; +} +static inline void irq_compat_clr_disabled(struct irq_desc *desc) +{ + desc->status &= ~IRQ_DISABLED; +} +static inline void irq_compat_set_pending(struct irq_desc *desc) +{ + desc->status |= IRQ_PENDING; +} + +static inline void irq_compat_clr_pending(struct irq_desc *desc) +{ + desc->status &= ~IRQ_PENDING; +} +static inline void irq_compat_set_masked(struct irq_desc *desc) +{ + desc->status |= IRQ_MASKED; +} + +static inline void irq_compat_clr_masked(struct irq_desc *desc) +{ + desc->status &= ~IRQ_MASKED; +} +static inline void irq_compat_set_move_pending(struct irq_desc *desc) +{ + desc->status |= IRQ_MOVE_PENDING; +} + +static inline void irq_compat_clr_move_pending(struct irq_desc *desc) +{ + desc->status &= ~IRQ_MOVE_PENDING; +} +static inline void irq_compat_set_affinity(struct irq_desc *desc) +{ + desc->status |= IRQ_AFFINITY_SET; +} + +static inline void irq_compat_clr_affinity(struct irq_desc *desc) +{ + desc->status &= ~IRQ_AFFINITY_SET; +} +#else +static inline void irq_compat_set_progress(struct irq_desc *desc) { } +static inline void irq_compat_clr_progress(struct irq_desc *desc) { } +static inline void irq_compat_set_disabled(struct irq_desc *desc) { } +static inline void irq_compat_clr_disabled(struct irq_desc *desc) { } +static inline void irq_compat_set_pending(struct irq_desc *desc) { } +static inline void irq_compat_clr_pending(struct irq_desc *desc) { } +static inline void irq_compat_set_masked(struct irq_desc *desc) { } +static inline void irq_compat_clr_masked(struct irq_desc *desc) { } +static inline void irq_compat_set_move_pending(struct irq_desc *desc) { } +static inline void irq_compat_clr_move_pending(struct irq_desc *desc) { } +static inline void irq_compat_set_affinity(struct irq_desc *desc) { } +static inline void irq_compat_clr_affinity(struct irq_desc *desc) { } +#endif + diff --git a/kernel/irq/debug.h b/kernel/irq/debug.h new file mode 100644 index 00000000000..d1a33b7fa61 --- /dev/null +++ b/kernel/irq/debug.h @@ -0,0 +1,40 @@ +/* + * Debugging printout: + */ + +#include <linux/kallsyms.h> + +#define P(f) if (desc->status & f) printk("%14s set\n", #f) +#define PS(f) if (desc->istate & f) printk("%14s set\n", #f) + +static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc) +{ + printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n", + irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); + printk("->handle_irq(): %p, ", desc->handle_irq); + print_symbol("%s\n", (unsigned long)desc->handle_irq); + printk("->irq_data.chip(): %p, ", desc->irq_data.chip); + print_symbol("%s\n", (unsigned long)desc->irq_data.chip); + printk("->action(): %p\n", desc->action); + if (desc->action) { + printk("->action->handler(): %p, ", desc->action->handler); + print_symbol("%s\n", (unsigned long)desc->action->handler); + } + + P(IRQ_LEVEL); + P(IRQ_PER_CPU); + P(IRQ_NOPROBE); + P(IRQ_NOREQUEST); + P(IRQ_NOAUTOEN); + + PS(IRQS_AUTODETECT); + PS(IRQS_INPROGRESS); + PS(IRQS_REPLAY); + PS(IRQS_WAITING); + PS(IRQS_DISABLED); + PS(IRQS_PENDING); + PS(IRQS_MASKED); +} + +#undef P +#undef PS diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 3540a719012..517561fc731 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -51,30 +51,92 @@ static void warn_no_thread(unsigned int irq, struct irqaction *action) "but no thread function available.", irq, action->name); } -/** - * handle_IRQ_event - irq action chain handler - * @irq: the interrupt number - * @action: the interrupt action chain for this irq - * - * Handles the action chain of an irq event - */ -irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action) +static void irq_wake_thread(struct irq_desc *desc, struct irqaction *action) +{ + /* + * Wake up the handler thread for this action. In case the + * thread crashed and was killed we just pretend that we + * handled the interrupt. The hardirq handler has disabled the + * device interrupt, so no irq storm is lurking. If the + * RUNTHREAD bit is already set, nothing to do. + */ + if (test_bit(IRQTF_DIED, &action->thread_flags) || + test_and_set_bit(IRQTF_RUNTHREAD, &action->thread_flags)) + return; + + /* + * It's safe to OR the mask lockless here. We have only two + * places which write to threads_oneshot: This code and the + * irq thread. + * + * This code is the hard irq context and can never run on two + * cpus in parallel. If it ever does we have more serious + * problems than this bitmask. + * + * The irq threads of this irq which clear their "running" bit + * in threads_oneshot are serialized via desc->lock against + * each other and they are serialized against this code by + * IRQS_INPROGRESS. + * + * Hard irq handler: + * + * spin_lock(desc->lock); + * desc->state |= IRQS_INPROGRESS; + * spin_unlock(desc->lock); + * set_bit(IRQTF_RUNTHREAD, &action->thread_flags); + * desc->threads_oneshot |= mask; + * spin_lock(desc->lock); + * desc->state &= ~IRQS_INPROGRESS; + * spin_unlock(desc->lock); + * + * irq thread: + * + * again: + * spin_lock(desc->lock); + * if (desc->state & IRQS_INPROGRESS) { + * spin_unlock(desc->lock); + * while(desc->state & IRQS_INPROGRESS) + * cpu_relax(); + * goto again; + * } + * if (!test_bit(IRQTF_RUNTHREAD, &action->thread_flags)) + * desc->threads_oneshot &= ~mask; + * spin_unlock(desc->lock); + * + * So either the thread waits for us to clear IRQS_INPROGRESS + * or we are waiting in the flow handler for desc->lock to be + * released before we reach this point. The thread also checks + * IRQTF_RUNTHREAD under desc->lock. If set it leaves + * threads_oneshot untouched and runs the thread another time. + */ + desc->threads_oneshot |= action->thread_mask; + wake_up_process(action->thread); +} + +irqreturn_t +handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action) { - irqreturn_t ret, retval = IRQ_NONE; - unsigned int status = 0; + irqreturn_t retval = IRQ_NONE; + unsigned int random = 0, irq = desc->irq_data.irq; do { + irqreturn_t res; + trace_irq_handler_entry(irq, action); - ret = action->handler(irq, action->dev_id); - trace_irq_handler_exit(irq, action, ret); + res = action->handler(irq, action->dev_id); + trace_irq_handler_exit(irq, action, res); - switch (ret) { + if (WARN_ONCE(!irqs_disabled(),"irq %u handler %pF enabled interrupts\n", + irq, action->handler)) + local_irq_disable(); + + switch (res) { case IRQ_WAKE_THREAD: /* * Set result to handled so the spurious check * does not trigger. */ - ret = IRQ_HANDLED; + res = IRQ_HANDLED; /* * Catch drivers which return WAKE_THREAD but @@ -85,36 +147,56 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action) break; } - /* - * Wake up the handler thread for this - * action. In case the thread crashed and was - * killed we just pretend that we handled the - * interrupt. The hardirq handler above has - * disabled the device interrupt, so no irq - * storm is lurking. - */ - if (likely(!test_bit(IRQTF_DIED, - &action->thread_flags))) { - set_bit(IRQTF_RUNTHREAD, &action->thread_flags); - wake_up_process(action->thread); - } + irq_wake_thread(desc, action); /* Fall through to add to randomness */ case IRQ_HANDLED: - status |= action->flags; + random |= action->flags; break; default: break; } - retval |= ret; + retval |= res; action = action->next; } while (action); - if (status & IRQF_SAMPLE_RANDOM) + if (random & IRQF_SAMPLE_RANDOM) add_interrupt_randomness(irq); - local_irq_disable(); + if (!noirqdebug) + note_interrupt(irq, desc, retval); return retval; } + +irqreturn_t handle_irq_event(struct irq_desc *desc) +{ + struct irqaction *action = desc->action; + irqreturn_t ret; + + irq_compat_clr_pending(desc); + desc->istate &= ~IRQS_PENDING; + irq_compat_set_progress(desc); + desc->istate |= IRQS_INPROGRESS; + raw_spin_unlock(&desc->lock); + + ret = handle_irq_event_percpu(desc, action); + + raw_spin_lock(&desc->lock); + desc->istate &= ~IRQS_INPROGRESS; + irq_compat_clr_progress(desc); + return ret; +} + +/** + * handle_IRQ_event - irq action chain handler + * @irq: the interrupt number + * @action: the interrupt action chain for this irq + * + * Handles the action chain of an irq event + */ +irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action) +{ + return handle_irq_event_percpu(irq_to_desc(irq), action); +} diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 99c3bc8a6fb..6c6ec9a4902 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -1,5 +1,9 @@ /* * IRQ subsystem internal functions and variables: + * + * Do not ever include this file from anything else than + * kernel/irq/. Do not even think about using any information outside + * of this file for your non core code. */ #include <linux/irqdesc.h> @@ -9,25 +13,89 @@ # define IRQ_BITMAP_BITS NR_IRQS #endif +#define istate core_internal_state__do_not_mess_with_it + +#ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT +# define status status_use_accessors +#endif + extern int noirqdebug; +/* + * Bits used by threaded handlers: + * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run + * IRQTF_DIED - handler thread died + * IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed + * IRQTF_AFFINITY - irq thread is requested to adjust affinity + * IRQTF_FORCED_THREAD - irq action is force threaded + */ +enum { + IRQTF_RUNTHREAD, + IRQTF_DIED, + IRQTF_WARNED, + IRQTF_AFFINITY, + IRQTF_FORCED_THREAD, +}; + +/* + * Bit masks for desc->state + * + * IRQS_AUTODETECT - autodetection in progress + * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt + * detection + * IRQS_POLL_INPROGRESS - polling in progress + * IRQS_INPROGRESS - Interrupt in progress + * IRQS_ONESHOT - irq is not unmasked in primary handler + * IRQS_REPLAY - irq is replayed + * IRQS_WAITING - irq is waiting + * IRQS_DISABLED - irq is disabled + * IRQS_PENDING - irq is pending and replayed later + * IRQS_MASKED - irq is masked + * IRQS_SUSPENDED - irq is suspended + */ +enum { + IRQS_AUTODETECT = 0x00000001, + IRQS_SPURIOUS_DISABLED = 0x00000002, + IRQS_POLL_INPROGRESS = 0x00000008, + IRQS_INPROGRESS = 0x00000010, + IRQS_ONESHOT = 0x00000020, + IRQS_REPLAY = 0x00000040, + IRQS_WAITING = 0x00000080, + IRQS_DISABLED = 0x00000100, + IRQS_PENDING = 0x00000200, + IRQS_MASKED = 0x00000400, + IRQS_SUSPENDED = 0x00000800, +}; + +#include "compat.h" +#include "debug.h" +#include "settings.h" + #define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data) /* Set default functions for irq_chip structures: */ extern void irq_chip_set_defaults(struct irq_chip *chip); -/* Set default handler: */ -extern void compat_irq_chip_set_default_handler(struct irq_desc *desc); - extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, unsigned long flags); extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp); extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume); +extern int irq_startup(struct irq_desc *desc); +extern void irq_shutdown(struct irq_desc *desc); +extern void irq_enable(struct irq_desc *desc); +extern void irq_disable(struct irq_desc *desc); +extern void mask_irq(struct irq_desc *desc); +extern void unmask_irq(struct irq_desc *desc); + extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); +irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action); +irqreturn_t handle_irq_event(struct irq_desc *desc); + /* Resending of interrupts :*/ void check_irq_resend(struct irq_desc *desc, unsigned int irq); +bool irq_wait_for_poll(struct irq_desc *desc); #ifdef CONFIG_PROC_FS extern void register_irq_proc(unsigned int irq, struct irq_desc *desc); @@ -43,20 +111,10 @@ static inline void unregister_handler_proc(unsigned int irq, struct irqaction *action) { } #endif -extern int irq_select_affinity_usr(unsigned int irq); +extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask); extern void irq_set_thread_affinity(struct irq_desc *desc); -#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED -static inline void irq_end(unsigned int irq, struct irq_desc *desc) -{ - if (desc->irq_data.chip && desc->irq_data.chip->end) - desc->irq_data.chip->end(irq); -} -#else -static inline void irq_end(unsigned int irq, struct irq_desc *desc) { } -#endif - /* Inline functions for support of irq chips on slow busses */ static inline void chip_bus_lock(struct irq_desc *desc) { @@ -70,43 +128,60 @@ static inline void chip_bus_sync_unlock(struct irq_desc *desc) desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data); } +struct irq_desc * +__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus); +void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus); + +static inline struct irq_desc * +irq_get_desc_buslock(unsigned int irq, unsigned long *flags) +{ + return __irq_get_desc_lock(irq, flags, true); +} + +static inline void +irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags) +{ + __irq_put_desc_unlock(desc, flags, true); +} + +static inline struct irq_desc * +irq_get_desc_lock(unsigned int irq, unsigned long *flags) +{ + return __irq_get_desc_lock(irq, flags, false); +} + +static inline void +irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags) +{ + __irq_put_desc_unlock(desc, flags, false); +} + /* - * Debugging printout: + * Manipulation functions for irq_data.state */ +static inline void irqd_set_move_pending(struct irq_data *d) +{ + d->state_use_accessors |= IRQD_SETAFFINITY_PENDING; + irq_compat_set_move_pending(irq_data_to_desc(d)); +} -#include <linux/kallsyms.h> - -#define P(f) if (desc->status & f) printk("%14s set\n", #f) +static inline void irqd_clr_move_pending(struct irq_data *d) +{ + d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING; + irq_compat_clr_move_pending(irq_data_to_desc(d)); +} -static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc) +static inline void irqd_clear(struct irq_data *d, unsigned int mask) { - printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n", - irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); - printk("->handle_irq(): %p, ", desc->handle_irq); - print_symbol("%s\n", (unsigned long)desc->handle_irq); - printk("->irq_data.chip(): %p, ", desc->irq_data.chip); - print_symbol("%s\n", (unsigned long)desc->irq_data.chip); - printk("->action(): %p\n", desc->action); - if (desc->action) { - printk("->action->handler(): %p, ", desc->action->handler); - print_symbol("%s\n", (unsigned long)desc->action->handler); - } - - P(IRQ_INPROGRESS); - P(IRQ_DISABLED); - P(IRQ_PENDING); - P(IRQ_REPLAY); - P(IRQ_AUTODETECT); - P(IRQ_WAITING); - P(IRQ_LEVEL); - P(IRQ_MASKED); -#ifdef CONFIG_IRQ_PER_CPU - P(IRQ_PER_CPU); -#endif - P(IRQ_NOPROBE); - P(IRQ_NOREQUEST); - P(IRQ_NOAUTOEN); + d->state_use_accessors &= ~mask; } -#undef P +static inline void irqd_set(struct irq_data *d, unsigned int mask) +{ + d->state_use_accessors |= mask; +} +static inline bool irqd_has_set(struct irq_data *d, unsigned int mask) +{ + return d->state_use_accessors & mask; +} diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 2039bea31bd..dbccc799407 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -79,7 +79,8 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node) desc->irq_data.chip_data = NULL; desc->irq_data.handler_data = NULL; desc->irq_data.msi_desc = NULL; - desc->status = IRQ_DEFAULT_INIT_FLAGS; + irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS); + desc->istate = IRQS_DISABLED; desc->handle_irq = handle_bad_irq; desc->depth = 1; desc->irq_count = 0; @@ -206,6 +207,14 @@ struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node) return NULL; } +static int irq_expand_nr_irqs(unsigned int nr) +{ + if (nr > IRQ_BITMAP_BITS) + return -ENOMEM; + nr_irqs = nr; + return 0; +} + int __init early_irq_init(void) { int i, initcnt, node = first_online_node; @@ -238,7 +247,7 @@ int __init early_irq_init(void) struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = { [0 ... NR_IRQS-1] = { - .status = IRQ_DEFAULT_INIT_FLAGS, + .istate = IRQS_DISABLED, .handle_irq = handle_bad_irq, .depth = 1, .lock = __RAW_SPIN_LOCK_UNLOCKED(irq_desc->lock), @@ -260,8 +269,8 @@ int __init early_irq_init(void) for (i = 0; i < count; i++) { desc[i].irq_data.irq = i; desc[i].irq_data.chip = &no_irq_chip; - /* TODO : do this allocation on-demand ... */ desc[i].kstat_irqs = alloc_percpu(unsigned int); + irq_settings_clr_and_set(desc, ~0, _IRQ_DEFAULT_INIT_FLAGS); alloc_masks(desc + i, GFP_KERNEL, node); desc_smp_init(desc + i, node); lockdep_set_class(&desc[i].lock, &irq_desc_lock_class); @@ -286,24 +295,14 @@ static void free_desc(unsigned int irq) static inline int alloc_descs(unsigned int start, unsigned int cnt, int node) { -#if defined(CONFIG_KSTAT_IRQS_ONDEMAND) - struct irq_desc *desc; - unsigned int i; - - for (i = 0; i < cnt; i++) { - desc = irq_to_desc(start + i); - if (desc && !desc->kstat_irqs) { - unsigned int __percpu *stats = alloc_percpu(unsigned int); - - if (!stats) - return -1; - if (cmpxchg(&desc->kstat_irqs, NULL, stats) != NULL) - free_percpu(stats); - } - } -#endif return start; } + +static int irq_expand_nr_irqs(unsigned int nr) +{ + return -ENOMEM; +} + #endif /* !CONFIG_SPARSE_IRQ */ /* Dynamic interrupt handling */ @@ -347,14 +346,17 @@ irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node) mutex_lock(&sparse_irq_lock); - start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0); + start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS, + from, cnt, 0); ret = -EEXIST; if (irq >=0 && start != irq) goto err; - ret = -ENOMEM; - if (start >= nr_irqs) - goto err; + if (start + cnt > nr_irqs) { + ret = irq_expand_nr_irqs(start + cnt); + if (ret) + goto err; + } bitmap_set(allocated_irqs, start, cnt); mutex_unlock(&sparse_irq_lock); @@ -401,6 +403,26 @@ unsigned int irq_get_next_irq(unsigned int offset) return find_next_bit(allocated_irqs, nr_irqs, offset); } +struct irq_desc * +__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus) +{ + struct irq_desc *desc = irq_to_desc(irq); + + if (desc) { + if (bus) + chip_bus_lock(desc); + raw_spin_lock_irqsave(&desc->lock, *flags); + } + return desc; +} + +void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus) +{ + raw_spin_unlock_irqrestore(&desc->lock, flags); + if (bus) + chip_bus_sync_unlock(desc); +} + /** * dynamic_irq_cleanup - cleanup a dynamically allocated irq * @irq: irq number to initialize diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 2782bacdf49..acd599a43bf 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -17,6 +17,17 @@ #include "internals.h" +#ifdef CONFIG_IRQ_FORCED_THREADING +__read_mostly bool force_irqthreads; + +static int __init setup_forced_irqthreads(char *arg) +{ + force_irqthreads = true; + return 0; +} +early_param("threadirqs", setup_forced_irqthreads); +#endif + /** * synchronize_irq - wait for pending IRQ handlers (on other CPUs) * @irq: interrupt number to wait for @@ -30,7 +41,7 @@ void synchronize_irq(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); - unsigned int status; + unsigned int state; if (!desc) return; @@ -42,16 +53,16 @@ void synchronize_irq(unsigned int irq) * Wait until we're out of the critical section. This might * give the wrong answer due to the lack of memory barriers. */ - while (desc->status & IRQ_INPROGRESS) + while (desc->istate & IRQS_INPROGRESS) cpu_relax(); /* Ok, that indicated we're done: double-check carefully. */ raw_spin_lock_irqsave(&desc->lock, flags); - status = desc->status; + state = desc->istate; raw_spin_unlock_irqrestore(&desc->lock, flags); /* Oops, that failed? */ - } while (status & IRQ_INPROGRESS); + } while (state & IRQS_INPROGRESS); /* * We made sure that no hardirq handler is running. Now verify @@ -73,8 +84,8 @@ int irq_can_set_affinity(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); - if (CHECK_IRQ_PER_CPU(desc->status) || !desc->irq_data.chip || - !desc->irq_data.chip->irq_set_affinity) + if (!desc || !irqd_can_balance(&desc->irq_data) || + !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) return 0; return 1; @@ -100,67 +111,169 @@ void irq_set_thread_affinity(struct irq_desc *desc) } } +#ifdef CONFIG_GENERIC_PENDING_IRQ +static inline bool irq_can_move_pcntxt(struct irq_desc *desc) +{ + return irq_settings_can_move_pcntxt(desc); +} +static inline bool irq_move_pending(struct irq_desc *desc) +{ + return irqd_is_setaffinity_pending(&desc->irq_data); +} +static inline void +irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) +{ + cpumask_copy(desc->pending_mask, mask); +} +static inline void +irq_get_pending(struct cpumask *mask, struct irq_desc *desc) +{ + cpumask_copy(mask, desc->pending_mask); +} +#else +static inline bool irq_can_move_pcntxt(struct irq_desc *desc) { return true; } +static inline bool irq_move_pending(struct irq_desc *desc) { return false; } +static inline void +irq_copy_pending(struct irq_desc *desc, const struct cpumask *mask) { } +static inline void +irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { } +#endif + /** * irq_set_affinity - Set the irq affinity of a given irq * @irq: Interrupt to set affinity * @cpumask: cpumask * */ -int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) +int irq_set_affinity(unsigned int irq, const struct cpumask *mask) { struct irq_desc *desc = irq_to_desc(irq); struct irq_chip *chip = desc->irq_data.chip; unsigned long flags; + int ret = 0; if (!chip->irq_set_affinity) return -EINVAL; raw_spin_lock_irqsave(&desc->lock, flags); -#ifdef CONFIG_GENERIC_PENDING_IRQ - if (desc->status & IRQ_MOVE_PCNTXT) { - if (!chip->irq_set_affinity(&desc->irq_data, cpumask, false)) { - cpumask_copy(desc->irq_data.affinity, cpumask); + if (irq_can_move_pcntxt(desc)) { + ret = chip->irq_set_affinity(&desc->irq_data, mask, false); + switch (ret) { + case IRQ_SET_MASK_OK: + cpumask_copy(desc->irq_data.affinity, mask); + case IRQ_SET_MASK_OK_NOCOPY: irq_set_thread_affinity(desc); + ret = 0; } + } else { + irqd_set_move_pending(&desc->irq_data); + irq_copy_pending(desc, mask); } - else { - desc->status |= IRQ_MOVE_PENDING; - cpumask_copy(desc->pending_mask, cpumask); - } -#else - if (!chip->irq_set_affinity(&desc->irq_data, cpumask, false)) { - cpumask_copy(desc->irq_data.affinity, cpumask); - irq_set_thread_affinity(desc); + + if (desc->affinity_notify) { + kref_get(&desc->affinity_notify->kref); + schedule_work(&desc->affinity_notify->work); } -#endif - desc->status |= IRQ_AFFINITY_SET; + irq_compat_set_affinity(desc); + irqd_set(&desc->irq_data, IRQD_AFFINITY_SET); raw_spin_unlock_irqrestore(&desc->lock, flags); - return 0; + return ret; } int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) { + unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); + + if (!desc) + return -EINVAL; + desc->affinity_hint = m; + irq_put_desc_unlock(desc, flags); + return 0; +} +EXPORT_SYMBOL_GPL(irq_set_affinity_hint); + +static void irq_affinity_notify(struct work_struct *work) +{ + struct irq_affinity_notify *notify = + container_of(work, struct irq_affinity_notify, work); + struct irq_desc *desc = irq_to_desc(notify->irq); + cpumask_var_t cpumask; + unsigned long flags; + + if (!desc || !alloc_cpumask_var(&cpumask, GFP_KERNEL)) + goto out; + + raw_spin_lock_irqsave(&desc->lock, flags); + if (irq_move_pending(desc)) + irq_get_pending(cpumask, desc); + else + cpumask_copy(cpumask, desc->irq_data.affinity); + raw_spin_unlock_irqrestore(&desc->lock, flags); + + notify->notify(notify, cpumask); + + free_cpumask_var(cpumask); +out: + kref_put(¬ify->kref, notify->release); +} + +/** + * irq_set_affinity_notifier - control notification of IRQ affinity changes + * @irq: Interrupt for which to enable/disable notification + * @notify: Context for notification, or %NULL to disable + * notification. Function pointers must be initialised; + * the other fields will be initialised by this function. + * + * Must be called in process context. Notification may only be enabled + * after the IRQ is allocated and must be disabled before the IRQ is + * freed using free_irq(). + */ +int +irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) +{ struct irq_desc *desc = irq_to_desc(irq); + struct irq_affinity_notify *old_notify; unsigned long flags; + /* The release function is promised process context */ + might_sleep(); + if (!desc) return -EINVAL; + /* Complete initialisation of *notify */ + if (notify) { + notify->irq = irq; + kref_init(¬ify->kref); + INIT_WORK(¬ify->work, irq_affinity_notify); + } + raw_spin_lock_irqsave(&desc->lock, flags); - desc->affinity_hint = m; + old_notify = desc->affinity_notify; + desc->affinity_notify = notify; raw_spin_unlock_irqrestore(&desc->lock, flags); + if (old_notify) + kref_put(&old_notify->kref, old_notify->release); + return 0; } -EXPORT_SYMBOL_GPL(irq_set_affinity_hint); +EXPORT_SYMBOL_GPL(irq_set_affinity_notifier); #ifndef CONFIG_AUTO_IRQ_AFFINITY /* * Generic version of the affinity autoselector. */ -static int setup_affinity(unsigned int irq, struct irq_desc *desc) +static int +setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) { + struct irq_chip *chip = irq_desc_get_chip(desc); + struct cpumask *set = irq_default_affinity; + int ret; + + /* Excludes PER_CPU and NO_BALANCE interrupts */ if (!irq_can_set_affinity(irq)) return 0; @@ -168,22 +281,29 @@ static int setup_affinity(unsigned int irq, struct irq_desc *desc) * Preserve an userspace affinity setup, but make sure that * one of the targets is online. */ - if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) { - if (cpumask_any_and(desc->irq_data.affinity, cpu_online_mask) - < nr_cpu_ids) - goto set_affinity; - else - desc->status &= ~IRQ_AFFINITY_SET; + if (irqd_has_set(&desc->irq_data, IRQD_AFFINITY_SET)) { + if (cpumask_intersects(desc->irq_data.affinity, + cpu_online_mask)) + set = desc->irq_data.affinity; + else { + irq_compat_clr_affinity(desc); + irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET); + } } - cpumask_and(desc->irq_data.affinity, cpu_online_mask, irq_default_affinity); -set_affinity: - desc->irq_data.chip->irq_set_affinity(&desc->irq_data, desc->irq_data.affinity, false); - + cpumask_and(mask, cpu_online_mask, set); + ret = chip->irq_set_affinity(&desc->irq_data, mask, false); + switch (ret) { + case IRQ_SET_MASK_OK: + cpumask_copy(desc->irq_data.affinity, mask); + case IRQ_SET_MASK_OK_NOCOPY: + irq_set_thread_affinity(desc); + } return 0; } #else -static inline int setup_affinity(unsigned int irq, struct irq_desc *d) +static inline int +setup_affinity(unsigned int irq, struct irq_desc *d, struct cpumask *mask) { return irq_select_affinity(irq); } @@ -192,23 +312,21 @@ static inline int setup_affinity(unsigned int irq, struct irq_desc *d) /* * Called when affinity is set via /proc/irq */ -int irq_select_affinity_usr(unsigned int irq) +int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask) { struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; int ret; raw_spin_lock_irqsave(&desc->lock, flags); - ret = setup_affinity(irq, desc); - if (!ret) - irq_set_thread_affinity(desc); + ret = setup_affinity(irq, desc, mask); raw_spin_unlock_irqrestore(&desc->lock, flags); - return ret; } #else -static inline int setup_affinity(unsigned int irq, struct irq_desc *desc) +static inline int +setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask) { return 0; } @@ -219,13 +337,23 @@ void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend) if (suspend) { if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND)) return; - desc->status |= IRQ_SUSPENDED; + desc->istate |= IRQS_SUSPENDED; } - if (!desc->depth++) { - desc->status |= IRQ_DISABLED; - desc->irq_data.chip->irq_disable(&desc->irq_data); - } + if (!desc->depth++) + irq_disable(desc); +} + +static int __disable_irq_nosync(unsigned int irq) +{ + unsigned long flags; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); + + if (!desc) + return -EINVAL; + __disable_irq(desc, irq, false); + irq_put_desc_busunlock(desc, flags); + return 0; } /** @@ -241,17 +369,7 @@ void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend) */ void disable_irq_nosync(unsigned int irq) { - struct irq_desc *desc = irq_to_desc(irq); - unsigned long flags; - - if (!desc) - return; - - chip_bus_lock(desc); - raw_spin_lock_irqsave(&desc->lock, flags); - __disable_irq(desc, irq, false); - raw_spin_unlock_irqrestore(&desc->lock, flags); - chip_bus_sync_unlock(desc); + __disable_irq_nosync(irq); } EXPORT_SYMBOL(disable_irq_nosync); @@ -269,13 +387,7 @@ EXPORT_SYMBOL(disable_irq_nosync); */ void disable_irq(unsigned int irq) { - struct irq_desc *desc = irq_to_desc(irq); - - if (!desc) - return; - - disable_irq_nosync(irq); - if (desc->action) + if (!__disable_irq_nosync(irq)) synchronize_irq(irq); } EXPORT_SYMBOL(disable_irq); @@ -283,7 +395,7 @@ EXPORT_SYMBOL(disable_irq); void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) { if (resume) { - if (!(desc->status & IRQ_SUSPENDED)) { + if (!(desc->istate & IRQS_SUSPENDED)) { if (!desc->action) return; if (!(desc->action->flags & IRQF_FORCE_RESUME)) @@ -291,7 +403,7 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) /* Pretend that it got disabled ! */ desc->depth++; } - desc->status &= ~IRQ_SUSPENDED; + desc->istate &= ~IRQS_SUSPENDED; } switch (desc->depth) { @@ -300,12 +412,11 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq); break; case 1: { - unsigned int status = desc->status & ~IRQ_DISABLED; - - if (desc->status & IRQ_SUSPENDED) + if (desc->istate & IRQS_SUSPENDED) goto err_out; /* Prevent probing on this irq: */ - desc->status = status | IRQ_NOPROBE; + irq_settings_set_noprobe(desc); + irq_enable(desc); check_irq_resend(desc, irq); /* fall-through */ } @@ -327,21 +438,18 @@ void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) */ void enable_irq(unsigned int irq) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); if (!desc) return; + if (WARN(!desc->irq_data.chip, + KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) + goto out; - if (WARN(!desc->irq_data.chip || !desc->irq_data.chip->irq_enable, - KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq)) - return; - - chip_bus_lock(desc); - raw_spin_lock_irqsave(&desc->lock, flags); __enable_irq(desc, irq, false); - raw_spin_unlock_irqrestore(&desc->lock, flags); - chip_bus_sync_unlock(desc); +out: + irq_put_desc_busunlock(desc, flags); } EXPORT_SYMBOL(enable_irq); @@ -357,7 +465,7 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on) } /** - * set_irq_wake - control irq power management wakeup + * irq_set_irq_wake - control irq power management wakeup * @irq: interrupt to control * @on: enable/disable power management wakeup * @@ -368,23 +476,22 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on) * Wakeup mode lets this IRQ wake the system from sleep * states like "suspend to RAM". */ -int set_irq_wake(unsigned int irq, unsigned int on) +int irq_set_irq_wake(unsigned int irq, unsigned int on) { - struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; + struct irq_desc *desc = irq_get_desc_buslock(irq, &flags); int ret = 0; /* wakeup-capable irqs can be shared between drivers that * don't need to have the same sleep mode behaviors. */ - raw_spin_lock_irqsave(&desc->lock, flags); if (on) { if (desc->wake_depth++ == 0) { ret = set_irq_wake_real(irq, on); if (ret) desc->wake_depth = 0; else - desc->status |= IRQ_WAKEUP; + irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE); } } else { if (desc->wake_depth == 0) { @@ -394,14 +501,13 @@ int set_irq_wake(unsigned int irq, unsigned int on) if (ret) desc->wake_depth = 1; else - desc->status &= ~IRQ_WAKEUP; + irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE); } } - - raw_spin_unlock_irqrestore(&desc->lock, flags); + irq_put_desc_busunlock(desc, flags); return ret; } -EXPORT_SYMBOL(set_irq_wake); +EXPORT_SYMBOL(irq_set_irq_wake); /* * Internal function that tells the architecture code whether a @@ -410,43 +516,27 @@ EXPORT_SYMBOL(set_irq_wake); */ int can_request_irq(unsigned int irq, unsigned long irqflags) { - struct irq_desc *desc = irq_to_desc(irq); - struct irqaction *action; unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags); + int canrequest = 0; if (!desc) return 0; - if (desc->status & IRQ_NOREQUEST) - return 0; - - raw_spin_lock_irqsave(&desc->lock, flags); - action = desc->action; - if (action) - if (irqflags & action->flags & IRQF_SHARED) - action = NULL; - - raw_spin_unlock_irqrestore(&desc->lock, flags); - - return !action; -} - -void compat_irq_chip_set_default_handler(struct irq_desc *desc) -{ - /* - * If the architecture still has not overriden - * the flow handler then zap the default. This - * should catch incorrect flow-type setting. - */ - if (desc->handle_irq == &handle_bad_irq) - desc->handle_irq = NULL; + if (irq_settings_can_request(desc)) { + if (desc->action) + if (irqflags & desc->action->flags & IRQF_SHARED) + canrequest =1; + } + irq_put_desc_unlock(desc, flags); + return canrequest; } int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, unsigned long flags) { - int ret; struct irq_chip *chip = desc->irq_data.chip; + int ret, unmask = 0; if (!chip || !chip->irq_set_type) { /* @@ -458,23 +548,43 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, return 0; } + flags &= IRQ_TYPE_SENSE_MASK; + + if (chip->flags & IRQCHIP_SET_TYPE_MASKED) { + if (!(desc->istate & IRQS_MASKED)) + mask_irq(desc); + if (!(desc->istate & IRQS_DISABLED)) + unmask = 1; + } + /* caller masked out all except trigger mode flags */ ret = chip->irq_set_type(&desc->irq_data, flags); - if (ret) - pr_err("setting trigger mode %lu for irq %u failed (%pF)\n", - flags, irq, chip->irq_set_type); - else { - if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) - flags |= IRQ_LEVEL; - /* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */ - desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK); - desc->status |= flags; + switch (ret) { + case IRQ_SET_MASK_OK: + irqd_clear(&desc->irq_data, IRQD_TRIGGER_MASK); + irqd_set(&desc->irq_data, flags); + + case IRQ_SET_MASK_OK_NOCOPY: + flags = irqd_get_trigger_type(&desc->irq_data); + irq_settings_set_trigger_mask(desc, flags); + irqd_clear(&desc->irq_data, IRQD_LEVEL); + irq_settings_clr_level(desc); + if (flags & IRQ_TYPE_LEVEL_MASK) { + irq_settings_set_level(desc); + irqd_set(&desc->irq_data, IRQD_LEVEL); + } if (chip != desc->irq_data.chip) irq_chip_set_defaults(desc->irq_data.chip); + ret = 0; + break; + default: + pr_err("setting trigger mode %lu for irq %u failed (%pF)\n", + flags, irq, chip->irq_set_type); } - + if (unmask) + unmask_irq(desc); return ret; } @@ -518,8 +628,11 @@ static int irq_wait_for_interrupt(struct irqaction *action) * handler finished. unmask if the interrupt has not been disabled and * is marked MASKED. */ -static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc) +static void irq_finalize_oneshot(struct irq_desc *desc, + struct irqaction *action, bool force) { + if (!(desc->istate & IRQS_ONESHOT)) + return; again: chip_bus_lock(desc); raw_spin_lock_irq(&desc->lock); @@ -531,26 +644,44 @@ again: * The thread is faster done than the hard interrupt handler * on the other CPU. If we unmask the irq line then the * interrupt can come in again and masks the line, leaves due - * to IRQ_INPROGRESS and the irq line is masked forever. + * to IRQS_INPROGRESS and the irq line is masked forever. + * + * This also serializes the state of shared oneshot handlers + * versus "desc->threads_onehsot |= action->thread_mask;" in + * irq_wake_thread(). See the comment there which explains the + * serialization. */ - if (unlikely(desc->status & IRQ_INPROGRESS)) { + if (unlikely(desc->istate & IRQS_INPROGRESS)) { raw_spin_unlock_irq(&desc->lock); chip_bus_sync_unlock(desc); cpu_relax(); goto again; } - if (!(desc->status & IRQ_DISABLED) && (desc->status & IRQ_MASKED)) { - desc->status &= ~IRQ_MASKED; + /* + * Now check again, whether the thread should run. Otherwise + * we would clear the threads_oneshot bit of this thread which + * was just set. + */ + if (!force && test_bit(IRQTF_RUNTHREAD, &action->thread_flags)) + goto out_unlock; + + desc->threads_oneshot &= ~action->thread_mask; + + if (!desc->threads_oneshot && !(desc->istate & IRQS_DISABLED) && + (desc->istate & IRQS_MASKED)) { + irq_compat_clr_masked(desc); + desc->istate &= ~IRQS_MASKED; desc->irq_data.chip->irq_unmask(&desc->irq_data); } +out_unlock: raw_spin_unlock_irq(&desc->lock); chip_bus_sync_unlock(desc); } #ifdef CONFIG_SMP /* - * Check whether we need to change the affinity of the interrupt thread. + * Check whether we need to chasnge the affinity of the interrupt thread. */ static void irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) @@ -582,6 +713,32 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { } #endif /* + * Interrupts which are not explicitely requested as threaded + * interrupts rely on the implicit bh/preempt disable of the hard irq + * context. So we need to disable bh here to avoid deadlocks and other + * side effects. + */ +static void +irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action) +{ + local_bh_disable(); + action->thread_fn(action->irq, action->dev_id); + irq_finalize_oneshot(desc, action, false); + local_bh_enable(); +} + +/* + * Interrupts explicitely requested as threaded interupts want to be + * preemtible - many of them need to sleep and wait for slow busses to + * complete. + */ +static void irq_thread_fn(struct irq_desc *desc, struct irqaction *action) +{ + action->thread_fn(action->irq, action->dev_id); + irq_finalize_oneshot(desc, action, false); +} + +/* * Interrupt handler thread */ static int irq_thread(void *data) @@ -591,7 +748,14 @@ static int irq_thread(void *data) }; struct irqaction *action = data; struct irq_desc *desc = irq_to_desc(action->irq); - int wake, oneshot = desc->status & IRQ_ONESHOT; + void (*handler_fn)(struct irq_desc *desc, struct irqaction *action); + int wake; + + if (force_irqthreads & test_bit(IRQTF_FORCED_THREAD, + &action->thread_flags)) + handler_fn = irq_forced_thread_fn; + else + handler_fn = irq_thread_fn; sched_setscheduler(current, SCHED_FIFO, ¶m); current->irqaction = action; @@ -603,23 +767,20 @@ static int irq_thread(void *data) atomic_inc(&desc->threads_active); raw_spin_lock_irq(&desc->lock); - if (unlikely(desc->status & IRQ_DISABLED)) { + if (unlikely(desc->istate & IRQS_DISABLED)) { /* * CHECKME: We might need a dedicated * IRQ_THREAD_PENDING flag here, which * retriggers the thread in check_irq_resend() - * but AFAICT IRQ_PENDING should be fine as it + * but AFAICT IRQS_PENDING should be fine as it * retriggers the interrupt itself --- tglx */ - desc->status |= IRQ_PENDING; + irq_compat_set_pending(desc); + desc->istate |= IRQS_PENDING; raw_spin_unlock_irq(&desc->lock); } else { raw_spin_unlock_irq(&desc->lock); - - action->thread_fn(action->irq, action->dev_id); - - if (oneshot) - irq_finalize_oneshot(action->irq, desc); + handler_fn(desc, action); } wake = atomic_dec_and_test(&desc->threads_active); @@ -628,6 +789,9 @@ static int irq_thread(void *data) wake_up(&desc->wait_for_threads); } + /* Prevent a stale desc->threads_oneshot */ + irq_finalize_oneshot(desc, action, true); + /* * Clear irqaction. Otherwise exit_irq_thread() would make * fuzz about an active irq thread going into nirvana. @@ -642,6 +806,7 @@ static int irq_thread(void *data) void exit_irq_thread(void) { struct task_struct *tsk = current; + struct irq_desc *desc; if (!tsk->irqaction) return; @@ -650,6 +815,14 @@ void exit_irq_thread(void) "exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", tsk->comm ? tsk->comm : "", tsk->pid, tsk->irqaction->irq); + desc = irq_to_desc(tsk->irqaction->irq); + + /* + * Prevent a stale desc->threads_oneshot. Must be called + * before setting the IRQTF_DIED flag. + */ + irq_finalize_oneshot(desc, tsk->irqaction, true); + /* * Set the THREAD DIED flag to prevent further wakeups of the * soon to be gone threaded handler. @@ -657,6 +830,22 @@ void exit_irq_thread(void) set_bit(IRQTF_DIED, &tsk->irqaction->flags); } +static void irq_setup_forced_threading(struct irqaction *new) +{ + if (!force_irqthreads) + return; + if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT)) + return; + + new->flags |= IRQF_ONESHOT; + + if (!new->thread_fn) { + set_bit(IRQTF_FORCED_THREAD, &new->thread_flags); + new->thread_fn = new->handler; + new->handler = irq_default_primary_handler; + } +} + /* * Internal function to register an irqaction - typically used to * allocate special interrupts that are part of the architecture. @@ -666,9 +855,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) { struct irqaction *old, **old_ptr; const char *old_name = NULL; - unsigned long flags; - int nested, shared = 0; - int ret; + unsigned long flags, thread_mask = 0; + int ret, nested, shared = 0; + cpumask_var_t mask; if (!desc) return -EINVAL; @@ -692,15 +881,11 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) rand_initialize_irq(irq); } - /* Oneshot interrupts are not allowed with shared */ - if ((new->flags & IRQF_ONESHOT) && (new->flags & IRQF_SHARED)) - return -EINVAL; - /* * Check whether the interrupt nests into another interrupt * thread. */ - nested = desc->status & IRQ_NESTED_THREAD; + nested = irq_settings_is_nested_thread(desc); if (nested) { if (!new->thread_fn) return -EINVAL; @@ -710,6 +895,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * dummy function which warns when called. */ new->handler = irq_nested_primary_handler; + } else { + irq_setup_forced_threading(new); } /* @@ -733,6 +920,11 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) new->thread = t; } + if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { + ret = -ENOMEM; + goto out_thread; + } + /* * The following block of code has to be executed atomically */ @@ -744,29 +936,40 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * Can't share interrupts unless both agree to and are * the same type (level, edge, polarity). So both flag * fields must have IRQF_SHARED set and the bits which - * set the trigger type must match. + * set the trigger type must match. Also all must + * agree on ONESHOT. */ if (!((old->flags & new->flags) & IRQF_SHARED) || - ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK)) { + ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) || + ((old->flags ^ new->flags) & IRQF_ONESHOT)) { old_name = old->name; goto mismatch; } -#if defined(CONFIG_IRQ_PER_CPU) /* All handlers must agree on per-cpuness */ if ((old->flags & IRQF_PERCPU) != (new->flags & IRQF_PERCPU)) goto mismatch; -#endif /* add new interrupt at end of irq queue */ do { + thread_mask |= old->thread_mask; old_ptr = &old->next; old = *old_ptr; } while (old); shared = 1; } + /* + * Setup the thread mask for this irqaction. Unlikely to have + * 32 resp 64 irqs sharing one line, but who knows. + */ + if (new->flags & IRQF_ONESHOT && thread_mask == ~0UL) { + ret = -EBUSY; + goto out_mask; + } + new->thread_mask = 1 << ffz(thread_mask); + if (!shared) { irq_chip_set_defaults(desc->irq_data.chip); @@ -778,42 +981,44 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) new->flags & IRQF_TRIGGER_MASK); if (ret) - goto out_thread; - } else - compat_irq_chip_set_default_handler(desc); -#if defined(CONFIG_IRQ_PER_CPU) - if (new->flags & IRQF_PERCPU) - desc->status |= IRQ_PER_CPU; -#endif + goto out_mask; + } - desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING | IRQ_ONESHOT | - IRQ_INPROGRESS | IRQ_SPURIOUS_DISABLED); + desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \ + IRQS_INPROGRESS | IRQS_ONESHOT | \ + IRQS_WAITING); + + if (new->flags & IRQF_PERCPU) { + irqd_set(&desc->irq_data, IRQD_PER_CPU); + irq_settings_set_per_cpu(desc); + } if (new->flags & IRQF_ONESHOT) - desc->status |= IRQ_ONESHOT; + desc->istate |= IRQS_ONESHOT; - if (!(desc->status & IRQ_NOAUTOEN)) { - desc->depth = 0; - desc->status &= ~IRQ_DISABLED; - desc->irq_data.chip->irq_startup(&desc->irq_data); - } else + if (irq_settings_can_autoenable(desc)) + irq_startup(desc); + else /* Undo nested disables: */ desc->depth = 1; /* Exclude IRQ from balancing if requested */ - if (new->flags & IRQF_NOBALANCING) - desc->status |= IRQ_NO_BALANCING; + if (new->flags & IRQF_NOBALANCING) { + irq_settings_set_no_balancing(desc); + irqd_set(&desc->irq_data, IRQD_NO_BALANCING); + } /* Set default affinity mask once everything is setup */ - setup_affinity(irq, desc); - - } else if ((new->flags & IRQF_TRIGGER_MASK) - && (new->flags & IRQF_TRIGGER_MASK) - != (desc->status & IRQ_TYPE_SENSE_MASK)) { - /* hope the handler works with the actual trigger mode... */ - pr_warning("IRQ %d uses trigger mode %d; requested %d\n", - irq, (int)(desc->status & IRQ_TYPE_SENSE_MASK), - (int)(new->flags & IRQF_TRIGGER_MASK)); + setup_affinity(irq, desc, mask); + + } else if (new->flags & IRQF_TRIGGER_MASK) { + unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK; + unsigned int omsk = irq_settings_get_trigger_mask(desc); + + if (nmsk != omsk) + /* hope the handler works with current trigger mode */ + pr_warning("IRQ %d uses trigger mode %u; requested %u\n", + irq, nmsk, omsk); } new->irq = irq; @@ -827,8 +1032,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * Check whether we disabled the irq via the spurious handler * before. Reenable it and give it another chance. */ - if (shared && (desc->status & IRQ_SPURIOUS_DISABLED)) { - desc->status &= ~IRQ_SPURIOUS_DISABLED; + if (shared && (desc->istate & IRQS_SPURIOUS_DISABLED)) { + desc->istate &= ~IRQS_SPURIOUS_DISABLED; __enable_irq(desc, irq, false); } @@ -858,6 +1063,9 @@ mismatch: #endif ret = -EBUSY; +out_mask: + free_cpumask_var(mask); + out_thread: raw_spin_unlock_irqrestore(&desc->lock, flags); if (new->thread) { @@ -880,9 +1088,14 @@ out_thread: */ int setup_irq(unsigned int irq, struct irqaction *act) { + int retval; struct irq_desc *desc = irq_to_desc(irq); - return __setup_irq(irq, desc, act); + chip_bus_lock(desc); + retval = __setup_irq(irq, desc, act); + chip_bus_sync_unlock(desc); + + return retval; } EXPORT_SYMBOL_GPL(setup_irq); @@ -933,13 +1146,8 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) #endif /* If this was the last handler, shut down the IRQ line: */ - if (!desc->action) { - desc->status |= IRQ_DISABLED; - if (desc->irq_data.chip->irq_shutdown) - desc->irq_data.chip->irq_shutdown(&desc->irq_data); - else - desc->irq_data.chip->irq_disable(&desc->irq_data); - } + if (!desc->action) + irq_shutdown(desc); #ifdef CONFIG_SMP /* make sure affinity_hint is cleaned up */ @@ -1013,6 +1221,11 @@ void free_irq(unsigned int irq, void *dev_id) if (!desc) return; +#ifdef CONFIG_SMP + if (WARN_ON(desc->affinity_notify)) + desc->affinity_notify = NULL; +#endif + chip_bus_lock(desc); kfree(__free_irq(irq, dev_id)); chip_bus_sync_unlock(desc); @@ -1083,7 +1296,7 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler, if (!desc) return -EINVAL; - if (desc->status & IRQ_NOREQUEST) + if (!irq_settings_can_request(desc)) return -EINVAL; if (!handler) { @@ -1158,7 +1371,7 @@ int request_any_context_irq(unsigned int irq, irq_handler_t handler, if (!desc) return -EINVAL; - if (desc->status & IRQ_NESTED_THREAD) { + if (irq_settings_is_nested_thread(desc)) { ret = request_threaded_irq(irq, NULL, handler, flags, name, dev_id); return !ret ? IRQC_IS_NESTED : ret; diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c index 441fd629ff0..ec4806d4778 100644 --- a/kernel/irq/migration.c +++ b/kernel/irq/migration.c @@ -4,23 +4,23 @@ #include "internals.h" -void move_masked_irq(int irq) +void irq_move_masked_irq(struct irq_data *idata) { - struct irq_desc *desc = irq_to_desc(irq); - struct irq_chip *chip = desc->irq_data.chip; + struct irq_desc *desc = irq_data_to_desc(idata); + struct irq_chip *chip = idata->chip; - if (likely(!(desc->status & IRQ_MOVE_PENDING))) + if (likely(!irqd_is_setaffinity_pending(&desc->irq_data))) return; /* * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. */ - if (CHECK_IRQ_PER_CPU(desc->status)) { + if (!irqd_can_balance(&desc->irq_data)) { WARN_ON(1); return; } - desc->status &= ~IRQ_MOVE_PENDING; + irqd_clr_move_pending(&desc->irq_data); if (unlikely(cpumask_empty(desc->pending_mask))) return; @@ -53,15 +53,20 @@ void move_masked_irq(int irq) cpumask_clear(desc->pending_mask); } -void move_native_irq(int irq) +void move_masked_irq(int irq) +{ + irq_move_masked_irq(irq_get_irq_data(irq)); +} + +void irq_move_irq(struct irq_data *idata) { - struct irq_desc *desc = irq_to_desc(irq); + struct irq_desc *desc = irq_data_to_desc(idata); bool masked; - if (likely(!(desc->status & IRQ_MOVE_PENDING))) + if (likely(!irqd_is_setaffinity_pending(idata))) return; - if (unlikely(desc->status & IRQ_DISABLED)) + if (unlikely(desc->istate & IRQS_DISABLED)) return; /* @@ -69,10 +74,15 @@ void move_native_irq(int irq) * threaded interrupt with ONESHOT set, we can end up with an * interrupt storm. */ - masked = desc->status & IRQ_MASKED; + masked = desc->istate & IRQS_MASKED; if (!masked) - desc->irq_data.chip->irq_mask(&desc->irq_data); - move_masked_irq(irq); + idata->chip->irq_mask(idata); + irq_move_masked_irq(idata); if (!masked) - desc->irq_data.chip->irq_unmask(&desc->irq_data); + idata->chip->irq_unmask(idata); +} + +void move_native_irq(int irq) +{ + irq_move_irq(irq_get_irq_data(irq)); } diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index d6bfb89cce9..f76fc00c987 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -18,7 +18,7 @@ * During system-wide suspend or hibernation device drivers need to be prevented * from receiving interrupts and this function is provided for this purpose. * It marks all interrupt lines in use, except for the timer ones, as disabled - * and sets the IRQ_SUSPENDED flag for each of them. + * and sets the IRQS_SUSPENDED flag for each of them. */ void suspend_device_irqs(void) { @@ -34,7 +34,7 @@ void suspend_device_irqs(void) } for_each_irq_desc(irq, desc) - if (desc->status & IRQ_SUSPENDED) + if (desc->istate & IRQS_SUSPENDED) synchronize_irq(irq); } EXPORT_SYMBOL_GPL(suspend_device_irqs); @@ -43,7 +43,7 @@ EXPORT_SYMBOL_GPL(suspend_device_irqs); * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs() * * Enable all interrupt lines previously disabled by suspend_device_irqs() that - * have the IRQ_SUSPENDED flag set. + * have the IRQS_SUSPENDED flag set. */ void resume_device_irqs(void) { @@ -68,9 +68,24 @@ int check_wakeup_irqs(void) struct irq_desc *desc; int irq; - for_each_irq_desc(irq, desc) - if ((desc->status & IRQ_WAKEUP) && (desc->status & IRQ_PENDING)) - return -EBUSY; + for_each_irq_desc(irq, desc) { + if (irqd_is_wakeup_set(&desc->irq_data)) { + if (desc->istate & IRQS_PENDING) + return -EBUSY; + continue; + } + /* + * Check the non wakeup interrupts whether they need + * to be masked before finally going into suspend + * state. That's for hardware which has no wakeup + * source configuration facility. The chip + * implementation indicates that with + * IRQCHIP_MASK_ON_SUSPEND. + */ + if (desc->istate & IRQS_SUSPENDED && + irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND) + mask_irq(desc); + } return 0; } diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 6c8a2a9f8a7..4cc2e5ed0be 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -11,6 +11,7 @@ #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/interrupt.h> +#include <linux/kernel_stat.h> #include "internals.h" @@ -24,7 +25,7 @@ static int irq_affinity_proc_show(struct seq_file *m, void *v) const struct cpumask *mask = desc->irq_data.affinity; #ifdef CONFIG_GENERIC_PENDING_IRQ - if (desc->status & IRQ_MOVE_PENDING) + if (irqd_is_setaffinity_pending(&desc->irq_data)) mask = desc->pending_mask; #endif seq_cpumask(m, mask); @@ -65,8 +66,7 @@ static ssize_t irq_affinity_proc_write(struct file *file, cpumask_var_t new_value; int err; - if (!irq_to_desc(irq)->irq_data.chip->irq_set_affinity || no_irq_affinity || - irq_balancing_disabled(irq)) + if (!irq_can_set_affinity(irq) || no_irq_affinity) return -EIO; if (!alloc_cpumask_var(&new_value, GFP_KERNEL)) @@ -89,7 +89,7 @@ static ssize_t irq_affinity_proc_write(struct file *file, if (!cpumask_intersects(new_value, cpu_online_mask)) { /* Special case for empty set - allow the architecture code to set default SMP affinity. */ - err = irq_select_affinity_usr(irq) ? -EINVAL : count; + err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count; } else { irq_set_affinity(irq, new_value); err = count; @@ -357,3 +357,65 @@ void init_irq_proc(void) } } +#ifdef CONFIG_GENERIC_IRQ_SHOW + +int __weak arch_show_interrupts(struct seq_file *p, int prec) +{ + return 0; +} + +int show_interrupts(struct seq_file *p, void *v) +{ + static int prec; + + unsigned long flags, any_count = 0; + int i = *(loff_t *) v, j; + struct irqaction *action; + struct irq_desc *desc; + + if (i > nr_irqs) + return 0; + + if (i == nr_irqs) + return arch_show_interrupts(p, prec); + + /* print header and calculate the width of the first column */ + if (i == 0) { + for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) + j *= 10; + + seq_printf(p, "%*s", prec + 8, ""); + for_each_online_cpu(j) + seq_printf(p, "CPU%-8d", j); + seq_putc(p, '\n'); + } + + desc = irq_to_desc(i); + if (!desc) + return 0; + + raw_spin_lock_irqsave(&desc->lock, flags); + for_each_online_cpu(j) + any_count |= kstat_irqs_cpu(i, j); + action = desc->action; + if (!action && !any_count) + goto out; + + seq_printf(p, "%*d: ", prec, i); + for_each_online_cpu(j) + seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); + seq_printf(p, " %8s", desc->irq_data.chip->name); + seq_printf(p, "-%-8s", desc->name); + + if (action) { + seq_printf(p, " %s", action->name); + while ((action = action->next) != NULL) + seq_printf(p, ", %s", action->name); + } + + seq_putc(p, '\n'); +out: + raw_spin_unlock_irqrestore(&desc->lock, flags); + return 0; +} +#endif diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c index dc49358b73f..ad683a99b1e 100644 --- a/kernel/irq/resend.c +++ b/kernel/irq/resend.c @@ -55,20 +55,19 @@ static DECLARE_TASKLET(resend_tasklet, resend_irqs, 0); */ void check_irq_resend(struct irq_desc *desc, unsigned int irq) { - unsigned int status = desc->status; - - /* - * Make sure the interrupt is enabled, before resending it: - */ - desc->irq_data.chip->irq_enable(&desc->irq_data); - /* * We do not resend level type interrupts. Level type * interrupts are resent by hardware when they are still * active. */ - if ((status & (IRQ_LEVEL | IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) { - desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY; + if (irq_settings_is_level(desc)) + return; + if (desc->istate & IRQS_REPLAY) + return; + if (desc->istate & IRQS_PENDING) { + irq_compat_clr_pending(desc); + desc->istate &= ~IRQS_PENDING; + desc->istate |= IRQS_REPLAY; if (!desc->irq_data.chip->irq_retrigger || !desc->irq_data.chip->irq_retrigger(&desc->irq_data)) { diff --git a/kernel/irq/settings.h b/kernel/irq/settings.h new file mode 100644 index 00000000000..0227ad35827 --- /dev/null +++ b/kernel/irq/settings.h @@ -0,0 +1,138 @@ +/* + * Internal header to deal with irq_desc->status which will be renamed + * to irq_desc->settings. + */ +enum { + _IRQ_DEFAULT_INIT_FLAGS = IRQ_DEFAULT_INIT_FLAGS, + _IRQ_PER_CPU = IRQ_PER_CPU, + _IRQ_LEVEL = IRQ_LEVEL, + _IRQ_NOPROBE = IRQ_NOPROBE, + _IRQ_NOREQUEST = IRQ_NOREQUEST, + _IRQ_NOAUTOEN = IRQ_NOAUTOEN, + _IRQ_MOVE_PCNTXT = IRQ_MOVE_PCNTXT, + _IRQ_NO_BALANCING = IRQ_NO_BALANCING, + _IRQ_NESTED_THREAD = IRQ_NESTED_THREAD, + _IRQF_MODIFY_MASK = IRQF_MODIFY_MASK, +}; + +#define IRQ_INPROGRESS GOT_YOU_MORON +#define IRQ_REPLAY GOT_YOU_MORON +#define IRQ_WAITING GOT_YOU_MORON +#define IRQ_DISABLED GOT_YOU_MORON +#define IRQ_PENDING GOT_YOU_MORON +#define IRQ_MASKED GOT_YOU_MORON +#define IRQ_WAKEUP GOT_YOU_MORON +#define IRQ_MOVE_PENDING GOT_YOU_MORON +#define IRQ_PER_CPU GOT_YOU_MORON +#define IRQ_NO_BALANCING GOT_YOU_MORON +#define IRQ_AFFINITY_SET GOT_YOU_MORON +#define IRQ_LEVEL GOT_YOU_MORON +#define IRQ_NOPROBE GOT_YOU_MORON +#define IRQ_NOREQUEST GOT_YOU_MORON +#define IRQ_NOAUTOEN GOT_YOU_MORON +#define IRQ_NESTED_THREAD GOT_YOU_MORON +#undef IRQF_MODIFY_MASK +#define IRQF_MODIFY_MASK GOT_YOU_MORON + +static inline void +irq_settings_clr_and_set(struct irq_desc *desc, u32 clr, u32 set) +{ + desc->status &= ~(clr & _IRQF_MODIFY_MASK); + desc->status |= (set & _IRQF_MODIFY_MASK); +} + +static inline bool irq_settings_is_per_cpu(struct irq_desc *desc) +{ + return desc->status & _IRQ_PER_CPU; +} + +static inline void irq_settings_set_per_cpu(struct irq_desc *desc) +{ + desc->status |= _IRQ_PER_CPU; +} + +static inline void irq_settings_set_no_balancing(struct irq_desc *desc) +{ + desc->status |= _IRQ_NO_BALANCING; +} + +static inline bool irq_settings_has_no_balance_set(struct irq_desc *desc) +{ + return desc->status & _IRQ_NO_BALANCING; +} + +static inline u32 irq_settings_get_trigger_mask(struct irq_desc *desc) +{ + return desc->status & IRQ_TYPE_SENSE_MASK; +} + +static inline void +irq_settings_set_trigger_mask(struct irq_desc *desc, u32 mask) +{ + desc->status &= ~IRQ_TYPE_SENSE_MASK; + desc->status |= mask & IRQ_TYPE_SENSE_MASK; +} + +static inline bool irq_settings_is_level(struct irq_desc *desc) +{ + return desc->status & _IRQ_LEVEL; +} + +static inline void irq_settings_clr_level(struct irq_desc *desc) +{ + desc->status &= ~_IRQ_LEVEL; +} + +static inline void irq_settings_set_level(struct irq_desc *desc) +{ + desc->status |= _IRQ_LEVEL; +} + +static inline bool irq_settings_can_request(struct irq_desc *desc) +{ + return !(desc->status & _IRQ_NOREQUEST); +} + +static inline void irq_settings_clr_norequest(struct irq_desc *desc) +{ + desc->status &= ~_IRQ_NOREQUEST; +} + +static inline void irq_settings_set_norequest(struct irq_desc *desc) +{ + desc->status |= _IRQ_NOREQUEST; +} + +static inline bool irq_settings_can_probe(struct irq_desc *desc) +{ + return !(desc->status & _IRQ_NOPROBE); +} + +static inline void irq_settings_clr_noprobe(struct irq_desc *desc) +{ + desc->status &= ~_IRQ_NOPROBE; +} + +static inline void irq_settings_set_noprobe(struct irq_desc *desc) +{ + desc->status |= _IRQ_NOPROBE; +} + +static inline bool irq_settings_can_move_pcntxt(struct irq_desc *desc) +{ + return desc->status & _IRQ_MOVE_PCNTXT; +} + +static inline bool irq_settings_can_autoenable(struct irq_desc *desc) +{ + return !(desc->status & _IRQ_NOAUTOEN); +} + +static inline bool irq_settings_is_nested_thread(struct irq_desc *desc) +{ + return desc->status & _IRQ_NESTED_THREAD; +} + +/* Nothing should touch desc->status from now on */ +#undef status +#define status USE_THE_PROPER_WRAPPERS_YOU_MORON diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c index 3089d3b9d5f..dd586ebf9c8 100644 --- a/kernel/irq/spurious.c +++ b/kernel/irq/spurious.c @@ -21,70 +21,94 @@ static int irqfixup __read_mostly; #define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10) static void poll_spurious_irqs(unsigned long dummy); static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0); +static int irq_poll_cpu; +static atomic_t irq_poll_active; + +/* + * We wait here for a poller to finish. + * + * If the poll runs on this CPU, then we yell loudly and return + * false. That will leave the interrupt line disabled in the worst + * case, but it should never happen. + * + * We wait until the poller is done and then recheck disabled and + * action (about to be disabled). Only if it's still active, we return + * true and let the handler run. + */ +bool irq_wait_for_poll(struct irq_desc *desc) +{ + if (WARN_ONCE(irq_poll_cpu == smp_processor_id(), + "irq poll in progress on cpu %d for irq %d\n", + smp_processor_id(), desc->irq_data.irq)) + return false; + +#ifdef CONFIG_SMP + do { + raw_spin_unlock(&desc->lock); + while (desc->istate & IRQS_INPROGRESS) + cpu_relax(); + raw_spin_lock(&desc->lock); + } while (desc->istate & IRQS_INPROGRESS); + /* Might have been disabled in meantime */ + return !(desc->istate & IRQS_DISABLED) && desc->action; +#else + return false; +#endif +} + /* * Recovery handler for misrouted interrupts. */ -static int try_one_irq(int irq, struct irq_desc *desc) +static int try_one_irq(int irq, struct irq_desc *desc, bool force) { + irqreturn_t ret = IRQ_NONE; struct irqaction *action; - int ok = 0, work = 0; raw_spin_lock(&desc->lock); - /* Already running on another processor */ - if (desc->status & IRQ_INPROGRESS) { - /* - * Already running: If it is shared get the other - * CPU to go looking for our mystery interrupt too - */ - if (desc->action && (desc->action->flags & IRQF_SHARED)) - desc->status |= IRQ_PENDING; - raw_spin_unlock(&desc->lock); - return ok; - } - /* Honour the normal IRQ locking */ - desc->status |= IRQ_INPROGRESS; - action = desc->action; - raw_spin_unlock(&desc->lock); - while (action) { - /* Only shared IRQ handlers are safe to call */ - if (action->flags & IRQF_SHARED) { - if (action->handler(irq, action->dev_id) == - IRQ_HANDLED) - ok = 1; - } - action = action->next; - } - local_irq_disable(); - /* Now clean up the flags */ - raw_spin_lock(&desc->lock); - action = desc->action; + /* PER_CPU and nested thread interrupts are never polled */ + if (irq_settings_is_per_cpu(desc) || irq_settings_is_nested_thread(desc)) + goto out; /* - * While we were looking for a fixup someone queued a real - * IRQ clashing with our walk: + * Do not poll disabled interrupts unless the spurious + * disabled poller asks explicitely. */ - while ((desc->status & IRQ_PENDING) && action) { + if ((desc->istate & IRQS_DISABLED) && !force) + goto out; + + /* + * All handlers must agree on IRQF_SHARED, so we test just the + * first. Check for action->next as well. + */ + action = desc->action; + if (!action || !(action->flags & IRQF_SHARED) || + (action->flags & __IRQF_TIMER) || !action->next) + goto out; + + /* Already running on another processor */ + if (desc->istate & IRQS_INPROGRESS) { /* - * Perform real IRQ processing for the IRQ we deferred + * Already running: If it is shared get the other + * CPU to go looking for our mystery interrupt too */ - work = 1; - raw_spin_unlock(&desc->lock); - handle_IRQ_event(irq, action); - raw_spin_lock(&desc->lock); - desc->status &= ~IRQ_PENDING; + irq_compat_set_pending(desc); + desc->istate |= IRQS_PENDING; + goto out; } - desc->status &= ~IRQ_INPROGRESS; - /* - * If we did actual work for the real IRQ line we must let the - * IRQ controller clean up too - */ - if (work) - irq_end(irq, desc); - raw_spin_unlock(&desc->lock); - return ok; + /* Mark it poll in progress */ + desc->istate |= IRQS_POLL_INPROGRESS; + do { + if (handle_irq_event(desc) == IRQ_HANDLED) + ret = IRQ_HANDLED; + action = desc->action; + } while ((desc->istate & IRQS_PENDING) && action); + desc->istate &= ~IRQS_POLL_INPROGRESS; +out: + raw_spin_unlock(&desc->lock); + return ret == IRQ_HANDLED; } static int misrouted_irq(int irq) @@ -92,6 +116,11 @@ static int misrouted_irq(int irq) struct irq_desc *desc; int i, ok = 0; + if (atomic_inc_return(&irq_poll_active) == 1) + goto out; + + irq_poll_cpu = smp_processor_id(); + for_each_irq_desc(i, desc) { if (!i) continue; @@ -99,9 +128,11 @@ static int misrouted_irq(int irq) if (i == irq) /* Already tried */ continue; - if (try_one_irq(i, desc)) + if (try_one_irq(i, desc, false)) ok = 1; } +out: + atomic_dec(&irq_poll_active); /* So the caller can adjust the irq error counts */ return ok; } @@ -111,23 +142,28 @@ static void poll_spurious_irqs(unsigned long dummy) struct irq_desc *desc; int i; + if (atomic_inc_return(&irq_poll_active) != 1) + goto out; + irq_poll_cpu = smp_processor_id(); + for_each_irq_desc(i, desc) { - unsigned int status; + unsigned int state; if (!i) continue; /* Racy but it doesn't matter */ - status = desc->status; + state = desc->istate; barrier(); - if (!(status & IRQ_SPURIOUS_DISABLED)) + if (!(state & IRQS_SPURIOUS_DISABLED)) continue; local_irq_disable(); - try_one_irq(i, desc); + try_one_irq(i, desc, true); local_irq_enable(); } - +out: + atomic_dec(&irq_poll_active); mod_timer(&poll_spurious_irq_timer, jiffies + POLL_SPURIOUS_IRQ_INTERVAL); } @@ -139,15 +175,13 @@ static void poll_spurious_irqs(unsigned long dummy) * * (The other 100-of-100,000 interrupts may have been a correctly * functioning device sharing an IRQ with the failing one) - * - * Called under desc->lock */ - static void __report_bad_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) { struct irqaction *action; + unsigned long flags; if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) { printk(KERN_ERR "irq event %d: bogus return value %x\n", @@ -159,6 +193,13 @@ __report_bad_irq(unsigned int irq, struct irq_desc *desc, dump_stack(); printk(KERN_ERR "handlers:\n"); + /* + * We need to take desc->lock here. note_interrupt() is called + * w/o desc->lock held, but IRQ_PROGRESS set. We might race + * with something else removing an action. It's ok to take + * desc->lock here. See synchronize_irq(). + */ + raw_spin_lock_irqsave(&desc->lock, flags); action = desc->action; while (action) { printk(KERN_ERR "[<%p>]", action->handler); @@ -167,6 +208,7 @@ __report_bad_irq(unsigned int irq, struct irq_desc *desc, printk("\n"); action = action->next; } + raw_spin_unlock_irqrestore(&desc->lock, flags); } static void @@ -218,6 +260,9 @@ try_misrouted_irq(unsigned int irq, struct irq_desc *desc, void note_interrupt(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) { + if (desc->istate & IRQS_POLL_INPROGRESS) + return; + if (unlikely(action_ret != IRQ_HANDLED)) { /* * If we are seeing only the odd spurious IRQ caused by @@ -254,9 +299,9 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc, * Now kill the IRQ */ printk(KERN_EMERG "Disabling IRQ #%d\n", irq); - desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED; + desc->istate |= IRQS_SPURIOUS_DISABLED; desc->depth++; - desc->irq_data.chip->irq_disable(&desc->irq_data); + irq_disable(desc); mod_timer(&poll_spurious_irq_timer, jiffies + POLL_SPURIOUS_IRQ_INTERVAL); diff --git a/kernel/sched.c b/kernel/sched.c index 27125e41357..c8e40b7005c 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2286,7 +2286,10 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state) * yield - it could be a while. */ if (unlikely(on_rq)) { - schedule_timeout_uninterruptible(1); + ktime_t to = ktime_set(0, NSEC_PER_SEC/HZ); + + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_hrtimeout(&to, HRTIMER_MODE_REL); continue; } diff --git a/kernel/softirq.c b/kernel/softirq.c index 0cee5048762..56e5dec837f 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -311,9 +311,21 @@ void irq_enter(void) } #ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED -# define invoke_softirq() __do_softirq() +static inline void invoke_softirq(void) +{ + if (!force_irqthreads) + __do_softirq(); + else + wakeup_softirqd(); +} #else -# define invoke_softirq() do_softirq() +static inline void invoke_softirq(void) +{ + if (!force_irqthreads) + do_softirq(); + else + wakeup_softirqd(); +} #endif /* @@ -737,7 +749,10 @@ static int run_ksoftirqd(void * __bind_cpu) don't process */ if (cpu_is_offline((long)__bind_cpu)) goto wait_to_die; - do_softirq(); + local_irq_disable(); + if (local_softirq_pending()) + __do_softirq(); + local_irq_enable(); preempt_enable_no_resched(); cond_resched(); preempt_disable(); |