diff options
Diffstat (limited to 'drivers/xen/events.c')
| -rw-r--r-- | drivers/xen/events.c | 946 |
1 files changed, 0 insertions, 946 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c deleted file mode 100644 index ce602dd09bc..00000000000 --- a/drivers/xen/events.c +++ /dev/null @@ -1,946 +0,0 @@ -/* - * Xen event channels - * - * Xen models interrupts with abstract event channels. Because each - * domain gets 1024 event channels, but NR_IRQ is not that large, we - * must dynamically map irqs<->event channels. The event channels - * interface with the rest of the kernel by defining a xen interrupt - * chip. When an event is recieved, it is mapped to an irq and sent - * through the normal interrupt processing path. - * - * There are four kinds of events which can be mapped to an event - * channel: - * - * 1. Inter-domain notifications. This includes all the virtual - * device events, since they're driven by front-ends in another domain - * (typically dom0). - * 2. VIRQs, typically used for timers. These are per-cpu events. - * 3. IPIs. - * 4. Hardware interrupts. Not supported at present. - * - * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 - */ - -#include <linux/linkage.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/module.h> -#include <linux/string.h> -#include <linux/bootmem.h> - -#include <asm/ptrace.h> -#include <asm/irq.h> -#include <asm/idle.h> -#include <asm/sync_bitops.h> -#include <asm/xen/hypercall.h> -#include <asm/xen/hypervisor.h> - -#include <xen/xen-ops.h> -#include <xen/events.h> -#include <xen/interface/xen.h> -#include <xen/interface/event_channel.h> - -/* - * This lock protects updates to the following mapping and reference-count - * arrays. The lock does not need to be acquired to read the mapping tables. - */ -static DEFINE_SPINLOCK(irq_mapping_update_lock); - -/* IRQ <-> VIRQ mapping. */ -static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1}; - -/* IRQ <-> IPI mapping */ -static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1}; - -/* Interrupt types. */ -enum xen_irq_type { - IRQT_UNBOUND = 0, - IRQT_PIRQ, - IRQT_VIRQ, - IRQT_IPI, - IRQT_EVTCHN -}; - -/* - * Packed IRQ information: - * type - enum xen_irq_type - * event channel - irq->event channel mapping - * cpu - cpu this event channel is bound to - * index - type-specific information: - * PIRQ - vector, with MSB being "needs EIO" - * VIRQ - virq number - * IPI - IPI vector - * EVTCHN - - */ -struct irq_info -{ - enum xen_irq_type type; /* type */ - unsigned short evtchn; /* event channel */ - unsigned short cpu; /* cpu bound */ - - union { - unsigned short virq; - enum ipi_vector ipi; - struct { - unsigned short gsi; - unsigned short vector; - } pirq; - } u; -}; - -static struct irq_info irq_info[NR_IRQS]; - -static int evtchn_to_irq[NR_EVENT_CHANNELS] = { - [0 ... NR_EVENT_CHANNELS-1] = -1 -}; -struct cpu_evtchn_s { - unsigned long bits[NR_EVENT_CHANNELS/BITS_PER_LONG]; -}; -static struct cpu_evtchn_s *cpu_evtchn_mask_p; -static inline unsigned long *cpu_evtchn_mask(int cpu) -{ - return cpu_evtchn_mask_p[cpu].bits; -} - -/* Xen will never allocate port zero for any purpose. */ -#define VALID_EVTCHN(chn) ((chn) != 0) - -static struct irq_chip xen_dynamic_chip; - -/* Constructor for packed IRQ information. */ -static struct irq_info mk_unbound_info(void) -{ - return (struct irq_info) { .type = IRQT_UNBOUND }; -} - -static struct irq_info mk_evtchn_info(unsigned short evtchn) -{ - return (struct irq_info) { .type = IRQT_EVTCHN, .evtchn = evtchn, - .cpu = 0 }; -} - -static struct irq_info mk_ipi_info(unsigned short evtchn, enum ipi_vector ipi) -{ - return (struct irq_info) { .type = IRQT_IPI, .evtchn = evtchn, - .cpu = 0, .u.ipi = ipi }; -} - -static struct irq_info mk_virq_info(unsigned short evtchn, unsigned short virq) -{ - return (struct irq_info) { .type = IRQT_VIRQ, .evtchn = evtchn, - .cpu = 0, .u.virq = virq }; -} - -static struct irq_info mk_pirq_info(unsigned short evtchn, - unsigned short gsi, unsigned short vector) -{ - return (struct irq_info) { .type = IRQT_PIRQ, .evtchn = evtchn, - .cpu = 0, .u.pirq = { .gsi = gsi, .vector = vector } }; -} - -/* - * Accessors for packed IRQ information. - */ -static struct irq_info *info_for_irq(unsigned irq) -{ - return &irq_info[irq]; -} - -static unsigned int evtchn_from_irq(unsigned irq) -{ - return info_for_irq(irq)->evtchn; -} - -unsigned irq_from_evtchn(unsigned int evtchn) -{ - return evtchn_to_irq[evtchn]; -} -EXPORT_SYMBOL_GPL(irq_from_evtchn); - -static enum ipi_vector ipi_from_irq(unsigned irq) -{ - struct irq_info *info = info_for_irq(irq); - - BUG_ON(info == NULL); - BUG_ON(info->type != IRQT_IPI); - - return info->u.ipi; -} - -static unsigned virq_from_irq(unsigned irq) -{ - struct irq_info *info = info_for_irq(irq); - - BUG_ON(info == NULL); - BUG_ON(info->type != IRQT_VIRQ); - - return info->u.virq; -} - -static unsigned gsi_from_irq(unsigned irq) -{ - struct irq_info *info = info_for_irq(irq); - - BUG_ON(info == NULL); - BUG_ON(info->type != IRQT_PIRQ); - - return info->u.pirq.gsi; -} - -static unsigned vector_from_irq(unsigned irq) -{ - struct irq_info *info = info_for_irq(irq); - - BUG_ON(info == NULL); - BUG_ON(info->type != IRQT_PIRQ); - - return info->u.pirq.vector; -} - -static enum xen_irq_type type_from_irq(unsigned irq) -{ - return info_for_irq(irq)->type; -} - -static unsigned cpu_from_irq(unsigned irq) -{ - return info_for_irq(irq)->cpu; -} - -static unsigned int cpu_from_evtchn(unsigned int evtchn) -{ - int irq = evtchn_to_irq[evtchn]; - unsigned ret = 0; - - if (irq != -1) - ret = cpu_from_irq(irq); - - return ret; -} - -static inline unsigned long active_evtchns(unsigned int cpu, - struct shared_info *sh, - unsigned int idx) -{ - return (sh->evtchn_pending[idx] & - cpu_evtchn_mask(cpu)[idx] & - ~sh->evtchn_mask[idx]); -} - -static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu) -{ - int irq = evtchn_to_irq[chn]; - - BUG_ON(irq == -1); -#ifdef CONFIG_SMP - cpumask_copy(irq_to_desc(irq)->affinity, cpumask_of(cpu)); -#endif - - __clear_bit(chn, cpu_evtchn_mask(cpu_from_irq(irq))); - __set_bit(chn, cpu_evtchn_mask(cpu)); - - irq_info[irq].cpu = cpu; -} - -static void init_evtchn_cpu_bindings(void) -{ -#ifdef CONFIG_SMP - struct irq_desc *desc; - int i; - - /* By default all event channels notify CPU#0. */ - for_each_irq_desc(i, desc) { - cpumask_copy(desc->affinity, cpumask_of(0)); - } -#endif - - memset(cpu_evtchn_mask(0), ~0, sizeof(cpu_evtchn_mask(0))); -} - -static inline void clear_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - sync_clear_bit(port, &s->evtchn_pending[0]); -} - -static inline void set_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - sync_set_bit(port, &s->evtchn_pending[0]); -} - -static inline int test_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - return sync_test_bit(port, &s->evtchn_pending[0]); -} - - -/** - * notify_remote_via_irq - send event to remote end of event channel via irq - * @irq: irq of event channel to send event to - * - * Unlike notify_remote_via_evtchn(), this is safe to use across - * save/restore. Notifications on a broken connection are silently - * dropped. - */ -void notify_remote_via_irq(int irq) -{ - int evtchn = evtchn_from_irq(irq); - - if (VALID_EVTCHN(evtchn)) - notify_remote_via_evtchn(evtchn); -} -EXPORT_SYMBOL_GPL(notify_remote_via_irq); - -static void mask_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - sync_set_bit(port, &s->evtchn_mask[0]); -} - -static void unmask_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - unsigned int cpu = get_cpu(); - - BUG_ON(!irqs_disabled()); - - /* Slow path (hypercall) if this is a non-local port. */ - if (unlikely(cpu != cpu_from_evtchn(port))) { - struct evtchn_unmask unmask = { .port = port }; - (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask); - } else { - struct vcpu_info *vcpu_info = __get_cpu_var(xen_vcpu); - - sync_clear_bit(port, &s->evtchn_mask[0]); - - /* - * The following is basically the equivalent of - * 'hw_resend_irq'. Just like a real IO-APIC we 'lose - * the interrupt edge' if the channel is masked. - */ - if (sync_test_bit(port, &s->evtchn_pending[0]) && - !sync_test_and_set_bit(port / BITS_PER_LONG, - &vcpu_info->evtchn_pending_sel)) - vcpu_info->evtchn_upcall_pending = 1; - } - - put_cpu(); -} - -static int find_unbound_irq(void) -{ - int irq; - struct irq_desc *desc; - - for (irq = 0; irq < nr_irqs; irq++) - if (irq_info[irq].type == IRQT_UNBOUND) - break; - - if (irq == nr_irqs) - panic("No available IRQ to bind to: increase nr_irqs!\n"); - - desc = irq_to_desc_alloc_node(irq, 0); - if (WARN_ON(desc == NULL)) - return -1; - - dynamic_irq_init(irq); - - return irq; -} - -int bind_evtchn_to_irq(unsigned int evtchn) -{ - int irq; - - spin_lock(&irq_mapping_update_lock); - - irq = evtchn_to_irq[evtchn]; - - if (irq == -1) { - irq = find_unbound_irq(); - - set_irq_chip_and_handler_name(irq, &xen_dynamic_chip, - handle_level_irq, "event"); - - evtchn_to_irq[evtchn] = irq; - irq_info[irq] = mk_evtchn_info(evtchn); - } - - spin_unlock(&irq_mapping_update_lock); - - return irq; -} -EXPORT_SYMBOL_GPL(bind_evtchn_to_irq); - -static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) -{ - struct evtchn_bind_ipi bind_ipi; - int evtchn, irq; - - spin_lock(&irq_mapping_update_lock); - - irq = per_cpu(ipi_to_irq, cpu)[ipi]; - - if (irq == -1) { - irq = find_unbound_irq(); - if (irq < 0) - goto out; - - set_irq_chip_and_handler_name(irq, &xen_dynamic_chip, - handle_level_irq, "ipi"); - - bind_ipi.vcpu = cpu; - if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, - &bind_ipi) != 0) - BUG(); - evtchn = bind_ipi.port; - - evtchn_to_irq[evtchn] = irq; - irq_info[irq] = mk_ipi_info(evtchn, ipi); - per_cpu(ipi_to_irq, cpu)[ipi] = irq; - - bind_evtchn_to_cpu(evtchn, cpu); - } - - out: - spin_unlock(&irq_mapping_update_lock); - return irq; -} - - -static int bind_virq_to_irq(unsigned int virq, unsigned int cpu) -{ - struct evtchn_bind_virq bind_virq; - int evtchn, irq; - - spin_lock(&irq_mapping_update_lock); - - irq = per_cpu(virq_to_irq, cpu)[virq]; - - if (irq == -1) { - bind_virq.virq = virq; - bind_virq.vcpu = cpu; - if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, - &bind_virq) != 0) - BUG(); - evtchn = bind_virq.port; - - irq = find_unbound_irq(); - - set_irq_chip_and_handler_name(irq, &xen_dynamic_chip, - handle_level_irq, "virq"); - - evtchn_to_irq[evtchn] = irq; - irq_info[irq] = mk_virq_info(evtchn, virq); - - per_cpu(virq_to_irq, cpu)[virq] = irq; - - bind_evtchn_to_cpu(evtchn, cpu); - } - - spin_unlock(&irq_mapping_update_lock); - - return irq; -} - -static void unbind_from_irq(unsigned int irq) -{ - struct evtchn_close close; - int evtchn = evtchn_from_irq(irq); - - spin_lock(&irq_mapping_update_lock); - - if (VALID_EVTCHN(evtchn)) { - close.port = evtchn; - if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0) - BUG(); - - switch (type_from_irq(irq)) { - case IRQT_VIRQ: - per_cpu(virq_to_irq, cpu_from_evtchn(evtchn)) - [virq_from_irq(irq)] = -1; - break; - case IRQT_IPI: - per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn)) - [ipi_from_irq(irq)] = -1; - break; - default: - break; - } - - /* Closed ports are implicitly re-bound to VCPU0. */ - bind_evtchn_to_cpu(evtchn, 0); - - evtchn_to_irq[evtchn] = -1; - } - - if (irq_info[irq].type != IRQT_UNBOUND) { - irq_info[irq] = mk_unbound_info(); - - dynamic_irq_cleanup(irq); - } - - spin_unlock(&irq_mapping_update_lock); -} - -int bind_evtchn_to_irqhandler(unsigned int evtchn, - irq_handler_t handler, - unsigned long irqflags, - const char *devname, void *dev_id) -{ - unsigned int irq; - int retval; - - irq = bind_evtchn_to_irq(evtchn); - retval = request_irq(irq, handler, irqflags, devname, dev_id); - if (retval != 0) { - unbind_from_irq(irq); - return retval; - } - - return irq; -} -EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler); - -int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu, - irq_handler_t handler, - unsigned long irqflags, const char *devname, void *dev_id) -{ - unsigned int irq; - int retval; - - irq = bind_virq_to_irq(virq, cpu); - retval = request_irq(irq, handler, irqflags, devname, dev_id); - if (retval != 0) { - unbind_from_irq(irq); - return retval; - } - - return irq; -} -EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler); - -int bind_ipi_to_irqhandler(enum ipi_vector ipi, - unsigned int cpu, - irq_handler_t handler, - unsigned long irqflags, - const char *devname, - void *dev_id) -{ - int irq, retval; - - irq = bind_ipi_to_irq(ipi, cpu); - if (irq < 0) - return irq; - - retval = request_irq(irq, handler, irqflags, devname, dev_id); - if (retval != 0) { - unbind_from_irq(irq); - return retval; - } - - return irq; -} - -void unbind_from_irqhandler(unsigned int irq, void *dev_id) -{ - free_irq(irq, dev_id); - unbind_from_irq(irq); -} -EXPORT_SYMBOL_GPL(unbind_from_irqhandler); - -void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector) -{ - int irq = per_cpu(ipi_to_irq, cpu)[vector]; - BUG_ON(irq < 0); - notify_remote_via_irq(irq); -} - -irqreturn_t xen_debug_interrupt(int irq, void *dev_id) -{ - struct shared_info *sh = HYPERVISOR_shared_info; - int cpu = smp_processor_id(); - int i; - unsigned long flags; - static DEFINE_SPINLOCK(debug_lock); - - spin_lock_irqsave(&debug_lock, flags); - - printk("vcpu %d\n ", cpu); - - for_each_online_cpu(i) { - struct vcpu_info *v = per_cpu(xen_vcpu, i); - printk("%d: masked=%d pending=%d event_sel %08lx\n ", i, - (get_irq_regs() && i == cpu) ? xen_irqs_disabled(get_irq_regs()) : v->evtchn_upcall_mask, - v->evtchn_upcall_pending, - v->evtchn_pending_sel); - } - printk("pending:\n "); - for(i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--) - printk("%08lx%s", sh->evtchn_pending[i], - i % 8 == 0 ? "\n " : " "); - printk("\nmasks:\n "); - for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) - printk("%08lx%s", sh->evtchn_mask[i], - i % 8 == 0 ? "\n " : " "); - - printk("\nunmasked:\n "); - for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) - printk("%08lx%s", sh->evtchn_pending[i] & ~sh->evtchn_mask[i], - i % 8 == 0 ? "\n " : " "); - - printk("\npending list:\n"); - for(i = 0; i < NR_EVENT_CHANNELS; i++) { - if (sync_test_bit(i, sh->evtchn_pending)) { - printk(" %d: event %d -> irq %d\n", - cpu_from_evtchn(i), i, - evtchn_to_irq[i]); - } - } - - spin_unlock_irqrestore(&debug_lock, flags); - - return IRQ_HANDLED; -} - -static DEFINE_PER_CPU(unsigned, xed_nesting_count); - -/* - * Search the CPUs pending events bitmasks. For each one found, map - * the event number to an irq, and feed it into do_IRQ() for - * handling. - * - * Xen uses a two-level bitmap to speed searching. The first level is - * a bitset of words which contain pending event bits. The second - * level is a bitset of pending events themselves. - */ -void xen_evtchn_do_upcall(struct pt_regs *regs) -{ - int cpu = get_cpu(); - struct pt_regs *old_regs = set_irq_regs(regs); - struct shared_info *s = HYPERVISOR_shared_info; - struct vcpu_info *vcpu_info = __get_cpu_var(xen_vcpu); - unsigned count; - - exit_idle(); - irq_enter(); - - do { - unsigned long pending_words; - - vcpu_info->evtchn_upcall_pending = 0; - - if (__get_cpu_var(xed_nesting_count)++) - goto out; - -#ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */ - /* Clear master flag /before/ clearing selector flag. */ - wmb(); -#endif - pending_words = xchg(&vcpu_info->evtchn_pending_sel, 0); - while (pending_words != 0) { - unsigned long pending_bits; - int word_idx = __ffs(pending_words); - pending_words &= ~(1UL << word_idx); - - while ((pending_bits = active_evtchns(cpu, s, word_idx)) != 0) { - int bit_idx = __ffs(pending_bits); - int port = (word_idx * BITS_PER_LONG) + bit_idx; - int irq = evtchn_to_irq[port]; - - if (irq != -1) - handle_irq(irq, regs); - } - } - - BUG_ON(!irqs_disabled()); - - count = __get_cpu_var(xed_nesting_count); - __get_cpu_var(xed_nesting_count) = 0; - } while(count != 1); - -out: - irq_exit(); - set_irq_regs(old_regs); - - put_cpu(); -} - -/* Rebind a new event channel to an existing irq. */ -void rebind_evtchn_irq(int evtchn, int irq) -{ - struct irq_info *info = info_for_irq(irq); - - /* Make sure the irq is masked, since the new event channel - will also be masked. */ - disable_irq(irq); - - spin_lock(&irq_mapping_update_lock); - - /* After resume the irq<->evtchn mappings are all cleared out */ - BUG_ON(evtchn_to_irq[evtchn] != -1); - /* Expect irq to have been bound before, - so there should be a proper type */ - BUG_ON(info->type == IRQT_UNBOUND); - - evtchn_to_irq[evtchn] = irq; - irq_info[irq] = mk_evtchn_info(evtchn); - - spin_unlock(&irq_mapping_update_lock); - - /* new event channels are always bound to cpu 0 */ - irq_set_affinity(irq, cpumask_of(0)); - - /* Unmask the event channel. */ - enable_irq(irq); -} - -/* Rebind an evtchn so that it gets delivered to a specific cpu */ -static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu) -{ - struct evtchn_bind_vcpu bind_vcpu; - int evtchn = evtchn_from_irq(irq); - - if (!VALID_EVTCHN(evtchn)) - return -1; - - /* Send future instances of this interrupt to other vcpu. */ - bind_vcpu.port = evtchn; - bind_vcpu.vcpu = tcpu; - - /* - * If this fails, it usually just indicates that we're dealing with a - * virq or IPI channel, which don't actually need to be rebound. Ignore - * it, but don't do the xenlinux-level rebind in that case. - */ - if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0) - bind_evtchn_to_cpu(evtchn, tcpu); - - return 0; -} - -static int set_affinity_irq(unsigned irq, const struct cpumask *dest) -{ - unsigned tcpu = cpumask_first(dest); - - return rebind_irq_to_cpu(irq, tcpu); -} - -int resend_irq_on_evtchn(unsigned int irq) -{ - int masked, evtchn = evtchn_from_irq(irq); - struct shared_info *s = HYPERVISOR_shared_info; - - if (!VALID_EVTCHN(evtchn)) - return 1; - - masked = sync_test_and_set_bit(evtchn, s->evtchn_mask); - sync_set_bit(evtchn, s->evtchn_pending); - if (!masked) - unmask_evtchn(evtchn); - - return 1; -} - -static void enable_dynirq(unsigned int irq) -{ - int evtchn = evtchn_from_irq(irq); - - if (VALID_EVTCHN(evtchn)) - unmask_evtchn(evtchn); -} - -static void disable_dynirq(unsigned int irq) -{ - int evtchn = evtchn_from_irq(irq); - - if (VALID_EVTCHN(evtchn)) - mask_evtchn(evtchn); -} - -static void ack_dynirq(unsigned int irq) -{ - int evtchn = evtchn_from_irq(irq); - - move_native_irq(irq); - - if (VALID_EVTCHN(evtchn)) - clear_evtchn(evtchn); -} - -static int retrigger_dynirq(unsigned int irq) -{ - int evtchn = evtchn_from_irq(irq); - struct shared_info *sh = HYPERVISOR_shared_info; - int ret = 0; - - if (VALID_EVTCHN(evtchn)) { - int masked; - - masked = sync_test_and_set_bit(evtchn, sh->evtchn_mask); - sync_set_bit(evtchn, sh->evtchn_pending); - if (!masked) - unmask_evtchn(evtchn); - ret = 1; - } - - return ret; -} - -static void restore_cpu_virqs(unsigned int cpu) -{ - struct evtchn_bind_virq bind_virq; - int virq, irq, evtchn; - - for (virq = 0; virq < NR_VIRQS; virq++) { - if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1) - continue; - - BUG_ON(virq_from_irq(irq) != virq); - - /* Get a new binding from Xen. */ - bind_virq.virq = virq; - bind_virq.vcpu = cpu; - if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, - &bind_virq) != 0) - BUG(); - evtchn = bind_virq.port; - - /* Record the new mapping. */ - evtchn_to_irq[evtchn] = irq; - irq_info[irq] = mk_virq_info(evtchn, virq); - bind_evtchn_to_cpu(evtchn, cpu); - - /* Ready for use. */ - unmask_evtchn(evtchn); - } -} - -static void restore_cpu_ipis(unsigned int cpu) -{ - struct evtchn_bind_ipi bind_ipi; - int ipi, irq, evtchn; - - for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) { - if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1) - continue; - - BUG_ON(ipi_from_irq(irq) != ipi); - - /* Get a new binding from Xen. */ - bind_ipi.vcpu = cpu; - if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, - &bind_ipi) != 0) - BUG(); - evtchn = bind_ipi.port; - - /* Record the new mapping. */ - evtchn_to_irq[evtchn] = irq; - irq_info[irq] = mk_ipi_info(evtchn, ipi); - bind_evtchn_to_cpu(evtchn, cpu); - - /* Ready for use. */ - unmask_evtchn(evtchn); - - } -} - -/* Clear an irq's pending state, in preparation for polling on it */ -void xen_clear_irq_pending(int irq) -{ - int evtchn = evtchn_from_irq(irq); - - if (VALID_EVTCHN(evtchn)) - clear_evtchn(evtchn); -} - -void xen_set_irq_pending(int irq) -{ - int evtchn = evtchn_from_irq(irq); - - if (VALID_EVTCHN(evtchn)) - set_evtchn(evtchn); -} - -bool xen_test_irq_pending(int irq) -{ - int evtchn = evtchn_from_irq(irq); - bool ret = false; - - if (VALID_EVTCHN(evtchn)) - ret = test_evtchn(evtchn); - - return ret; -} - -/* Poll waiting for an irq to become pending. In the usual case, the - irq will be disabled so it won't deliver an interrupt. */ -void xen_poll_irq(int irq) -{ - evtchn_port_t evtchn = evtchn_from_irq(irq); - - if (VALID_EVTCHN(evtchn)) { - struct sched_poll poll; - - poll.nr_ports = 1; - poll.timeout = 0; - set_xen_guest_handle(poll.ports, &evtchn); - - if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0) - BUG(); - } -} - -void xen_irq_resume(void) -{ - unsigned int cpu, irq, evtchn; - - init_evtchn_cpu_bindings(); - - /* New event-channel space is not 'live' yet. */ - for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++) - mask_evtchn(evtchn); - - /* No IRQ <-> event-channel mappings. */ - for (irq = 0; irq < nr_irqs; irq++) - irq_info[irq].evtchn = 0; /* zap event-channel binding */ - - for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++) - evtchn_to_irq[evtchn] = -1; - - for_each_possible_cpu(cpu) { - restore_cpu_virqs(cpu); - restore_cpu_ipis(cpu); - } -} - -static struct irq_chip xen_dynamic_chip __read_mostly = { - .name = "xen-dyn", - - .disable = disable_dynirq, - .mask = disable_dynirq, - .unmask = enable_dynirq, - - .ack = ack_dynirq, - .set_affinity = set_affinity_irq, - .retrigger = retrigger_dynirq, -}; - -void __init xen_init_IRQ(void) -{ - int i; - - cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s), - GFP_KERNEL); - BUG_ON(cpu_evtchn_mask_p == NULL); - - init_evtchn_cpu_bindings(); - - /* No event channels are 'live' right now. */ - for (i = 0; i < NR_EVENT_CHANNELS; i++) - mask_evtchn(i); - - irq_ctx_init(smp_processor_id()); -} |