From d2ba3166f23baa53f5ee9c5c2ca43b42fb4e9e62 Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Wed, 7 Aug 2013 14:32:12 +0100 Subject: xen/events: move drivers/xen/events.c into drivers/xen/events/ events.c will be split into multiple files so move it into its own directory. Signed-off-by: David Vrabel Reviewed-by: Konrad Rzeszutek Wilk Reviewed-by: Boris Ostrovsky --- drivers/xen/events.c | 1908 -------------------------------------------------- 1 file changed, 1908 deletions(-) delete mode 100644 drivers/xen/events.c (limited to 'drivers/xen/events.c') diff --git a/drivers/xen/events.c b/drivers/xen/events.c deleted file mode 100644 index fec5da4ff3a0..000000000000 --- a/drivers/xen/events.c +++ /dev/null @@ -1,1908 +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 received, 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. PIRQs - Hardware interrupts. - * - * Jeremy Fitzhardinge , XenSource Inc, 2007 - */ - -#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#ifdef CONFIG_X86 -#include -#include -#include -#include -#include -#include -#include -#endif -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -/* - * 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_MUTEX(irq_mapping_update_lock); - -static LIST_HEAD(xen_irq_list_head); - -/* 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 - physical IRQ, GSI, flags, and owner domain - * VIRQ - virq number - * IPI - IPI vector - * EVTCHN - - */ -struct irq_info { - struct list_head list; - int refcnt; - enum xen_irq_type type; /* type */ - unsigned irq; - unsigned short evtchn; /* event channel */ - unsigned short cpu; /* cpu bound */ - - union { - unsigned short virq; - enum ipi_vector ipi; - struct { - unsigned short pirq; - unsigned short gsi; - unsigned char flags; - uint16_t domid; - } pirq; - } u; -}; -#define PIRQ_NEEDS_EOI (1 << 0) -#define PIRQ_SHAREABLE (1 << 1) - -static int *evtchn_to_irq; -#ifdef CONFIG_X86 -static unsigned long *pirq_eoi_map; -#endif -static bool (*pirq_needs_eoi)(unsigned irq); - -/* - * Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be - * careful to only use bitops which allow for this (e.g - * test_bit/find_first_bit and friends but not __ffs) and to pass - * BITS_PER_EVTCHN_WORD as the bitmask length. - */ -#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8) -/* - * Make a bitmask (i.e. unsigned long *) of a xen_ulong_t - * array. Primarily to avoid long lines (hence the terse name). - */ -#define BM(x) (unsigned long *)(x) -/* Find the first set bit in a evtchn mask */ -#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD) - -static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD], - cpu_evtchn_mask); - -/* Xen will never allocate port zero for any purpose. */ -#define VALID_EVTCHN(chn) ((chn) != 0) - -static struct irq_chip xen_dynamic_chip; -static struct irq_chip xen_percpu_chip; -static struct irq_chip xen_pirq_chip; -static void enable_dynirq(struct irq_data *data); -static void disable_dynirq(struct irq_data *data); - -/* Get info for IRQ */ -static struct irq_info *info_for_irq(unsigned irq) -{ - return irq_get_handler_data(irq); -} - -/* Constructors for packed IRQ information. */ -static void xen_irq_info_common_init(struct irq_info *info, - unsigned irq, - enum xen_irq_type type, - unsigned short evtchn, - unsigned short cpu) -{ - - BUG_ON(info->type != IRQT_UNBOUND && info->type != type); - - info->type = type; - info->irq = irq; - info->evtchn = evtchn; - info->cpu = cpu; - - evtchn_to_irq[evtchn] = irq; - - irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN); -} - -static void xen_irq_info_evtchn_init(unsigned irq, - unsigned short evtchn) -{ - struct irq_info *info = info_for_irq(irq); - - xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0); -} - -static void xen_irq_info_ipi_init(unsigned cpu, - unsigned irq, - unsigned short evtchn, - enum ipi_vector ipi) -{ - struct irq_info *info = info_for_irq(irq); - - xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0); - - info->u.ipi = ipi; - - per_cpu(ipi_to_irq, cpu)[ipi] = irq; -} - -static void xen_irq_info_virq_init(unsigned cpu, - unsigned irq, - unsigned short evtchn, - unsigned short virq) -{ - struct irq_info *info = info_for_irq(irq); - - xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0); - - info->u.virq = virq; - - per_cpu(virq_to_irq, cpu)[virq] = irq; -} - -static void xen_irq_info_pirq_init(unsigned irq, - unsigned short evtchn, - unsigned short pirq, - unsigned short gsi, - uint16_t domid, - unsigned char flags) -{ - struct irq_info *info = info_for_irq(irq); - - xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0); - - info->u.pirq.pirq = pirq; - info->u.pirq.gsi = gsi; - info->u.pirq.domid = domid; - info->u.pirq.flags = flags; -} - -/* - * Accessors for packed IRQ information. - */ -static unsigned int evtchn_from_irq(unsigned irq) -{ - if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq))) - return 0; - - 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 pirq_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.pirq; -} - -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; -} - -#ifdef CONFIG_X86 -static bool pirq_check_eoi_map(unsigned irq) -{ - return test_bit(pirq_from_irq(irq), pirq_eoi_map); -} -#endif - -static bool pirq_needs_eoi_flag(unsigned irq) -{ - struct irq_info *info = info_for_irq(irq); - BUG_ON(info->type != IRQT_PIRQ); - - return info->u.pirq.flags & PIRQ_NEEDS_EOI; -} - -static inline xen_ulong_t active_evtchns(unsigned int cpu, - struct shared_info *sh, - unsigned int idx) -{ - return sh->evtchn_pending[idx] & - per_cpu(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)->irq_data.affinity, cpumask_of(cpu)); -#endif - - clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq)))); - set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu))); - - info_for_irq(irq)->cpu = cpu; -} - -static inline void clear_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - sync_clear_bit(port, BM(&s->evtchn_pending[0])); -} - -static inline void set_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - sync_set_bit(port, BM(&s->evtchn_pending[0])); -} - -static inline int test_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - return sync_test_bit(port, BM(&s->evtchn_pending[0])); -} - -static inline int test_and_set_mask(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - return sync_test_and_set_bit(port, BM(&s->evtchn_mask[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, BM(&s->evtchn_mask[0])); -} - -static void unmask_evtchn(int port) -{ - struct shared_info *s = HYPERVISOR_shared_info; - unsigned int cpu = get_cpu(); - int do_hypercall = 0, evtchn_pending = 0; - - BUG_ON(!irqs_disabled()); - - if (unlikely((cpu != cpu_from_evtchn(port)))) - do_hypercall = 1; - else { - /* - * Need to clear the mask before checking pending to - * avoid a race with an event becoming pending. - * - * EVTCHNOP_unmask will only trigger an upcall if the - * mask bit was set, so if a hypercall is needed - * remask the event. - */ - sync_clear_bit(port, BM(&s->evtchn_mask[0])); - evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0])); - - if (unlikely(evtchn_pending && xen_hvm_domain())) { - sync_set_bit(port, BM(&s->evtchn_mask[0])); - do_hypercall = 1; - } - } - - /* Slow path (hypercall) if this is a non-local port or if this is - * an hvm domain and an event is pending (hvm domains don't have - * their own implementation of irq_enable). */ - if (do_hypercall) { - struct evtchn_unmask unmask = { .port = port }; - (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask); - } else { - struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu); - - /* - * 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 (evtchn_pending && - !sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD, - BM(&vcpu_info->evtchn_pending_sel))) - vcpu_info->evtchn_upcall_pending = 1; - } - - put_cpu(); -} - -static void xen_irq_init(unsigned irq) -{ - struct irq_info *info; -#ifdef CONFIG_SMP - struct irq_desc *desc = irq_to_desc(irq); - - /* By default all event channels notify CPU#0. */ - cpumask_copy(desc->irq_data.affinity, cpumask_of(0)); -#endif - - info = kzalloc(sizeof(*info), GFP_KERNEL); - if (info == NULL) - panic("Unable to allocate metadata for IRQ%d\n", irq); - - info->type = IRQT_UNBOUND; - info->refcnt = -1; - - irq_set_handler_data(irq, info); - - list_add_tail(&info->list, &xen_irq_list_head); -} - -static int __must_check xen_allocate_irq_dynamic(void) -{ - int first = 0; - int irq; - -#ifdef CONFIG_X86_IO_APIC - /* - * For an HVM guest or domain 0 which see "real" (emulated or - * actual respectively) GSIs we allocate dynamic IRQs - * e.g. those corresponding to event channels or MSIs - * etc. from the range above those "real" GSIs to avoid - * collisions. - */ - if (xen_initial_domain() || xen_hvm_domain()) - first = get_nr_irqs_gsi(); -#endif - - irq = irq_alloc_desc_from(first, -1); - - if (irq >= 0) - xen_irq_init(irq); - - return irq; -} - -static int __must_check xen_allocate_irq_gsi(unsigned gsi) -{ - int irq; - - /* - * A PV guest has no concept of a GSI (since it has no ACPI - * nor access to/knowledge of the physical APICs). Therefore - * all IRQs are dynamically allocated from the entire IRQ - * space. - */ - if (xen_pv_domain() && !xen_initial_domain()) - return xen_allocate_irq_dynamic(); - - /* Legacy IRQ descriptors are already allocated by the arch. */ - if (gsi < NR_IRQS_LEGACY) - irq = gsi; - else - irq = irq_alloc_desc_at(gsi, -1); - - xen_irq_init(irq); - - return irq; -} - -static void xen_free_irq(unsigned irq) -{ - struct irq_info *info = irq_get_handler_data(irq); - - if (WARN_ON(!info)) - return; - - list_del(&info->list); - - irq_set_handler_data(irq, NULL); - - WARN_ON(info->refcnt > 0); - - kfree(info); - - /* Legacy IRQ descriptors are managed by the arch. */ - if (irq < NR_IRQS_LEGACY) - return; - - irq_free_desc(irq); -} - -static void pirq_query_unmask(int irq) -{ - struct physdev_irq_status_query irq_status; - struct irq_info *info = info_for_irq(irq); - - BUG_ON(info->type != IRQT_PIRQ); - - irq_status.irq = pirq_from_irq(irq); - if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status)) - irq_status.flags = 0; - - info->u.pirq.flags &= ~PIRQ_NEEDS_EOI; - if (irq_status.flags & XENIRQSTAT_needs_eoi) - info->u.pirq.flags |= PIRQ_NEEDS_EOI; -} - -static bool probing_irq(int irq) -{ - struct irq_desc *desc = irq_to_desc(irq); - - return desc && desc->action == NULL; -} - -static void eoi_pirq(struct irq_data *data) -{ - int evtchn = evtchn_from_irq(data->irq); - struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) }; - int rc = 0; - - irq_move_irq(data); - - if (VALID_EVTCHN(evtchn)) - clear_evtchn(evtchn); - - if (pirq_needs_eoi(data->irq)) { - rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi); - WARN_ON(rc); - } -} - -static void mask_ack_pirq(struct irq_data *data) -{ - disable_dynirq(data); - eoi_pirq(data); -} - -static unsigned int __startup_pirq(unsigned int irq) -{ - struct evtchn_bind_pirq bind_pirq; - struct irq_info *info = info_for_irq(irq); - int evtchn = evtchn_from_irq(irq); - int rc; - - BUG_ON(info->type != IRQT_PIRQ); - - if (VALID_EVTCHN(evtchn)) - goto out; - - bind_pirq.pirq = pirq_from_irq(irq); - /* NB. We are happy to share unless we are probing. */ - bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ? - BIND_PIRQ__WILL_SHARE : 0; - rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq); - if (rc != 0) { - if (!probing_irq(irq)) - pr_info("Failed to obtain physical IRQ %d\n", irq); - return 0; - } - evtchn = bind_pirq.port; - - pirq_query_unmask(irq); - - evtchn_to_irq[evtchn] = irq; - bind_evtchn_to_cpu(evtchn, 0); - info->evtchn = evtchn; - -out: - unmask_evtchn(evtchn); - eoi_pirq(irq_get_irq_data(irq)); - - return 0; -} - -static unsigned int startup_pirq(struct irq_data *data) -{ - return __startup_pirq(data->irq); -} - -static void shutdown_pirq(struct irq_data *data) -{ - struct evtchn_close close; - unsigned int irq = data->irq; - struct irq_info *info = info_for_irq(irq); - int evtchn = evtchn_from_irq(irq); - - BUG_ON(info->type != IRQT_PIRQ); - - if (!VALID_EVTCHN(evtchn)) - return; - - mask_evtchn(evtchn); - - close.port = evtchn; - if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0) - BUG(); - - bind_evtchn_to_cpu(evtchn, 0); - evtchn_to_irq[evtchn] = -1; - info->evtchn = 0; -} - -static void enable_pirq(struct irq_data *data) -{ - startup_pirq(data); -} - -static void disable_pirq(struct irq_data *data) -{ - disable_dynirq(data); -} - -int xen_irq_from_gsi(unsigned gsi) -{ - struct irq_info *info; - - list_for_each_entry(info, &xen_irq_list_head, list) { - if (info->type != IRQT_PIRQ) - continue; - - if (info->u.pirq.gsi == gsi) - return info->irq; - } - - return -1; -} -EXPORT_SYMBOL_GPL(xen_irq_from_gsi); - -/* - * Do not make any assumptions regarding the relationship between the - * IRQ number returned here and the Xen pirq argument. - * - * Note: We don't assign an event channel until the irq actually started - * up. Return an existing irq if we've already got one for the gsi. - * - * Shareable implies level triggered, not shareable implies edge - * triggered here. - */ -int xen_bind_pirq_gsi_to_irq(unsigned gsi, - unsigned pirq, int shareable, char *name) -{ - int irq = -1; - struct physdev_irq irq_op; - - mutex_lock(&irq_mapping_update_lock); - - irq = xen_irq_from_gsi(gsi); - if (irq != -1) { - pr_info("%s: returning irq %d for gsi %u\n", - __func__, irq, gsi); - goto out; - } - - irq = xen_allocate_irq_gsi(gsi); - if (irq < 0) - goto out; - - irq_op.irq = irq; - irq_op.vector = 0; - - /* Only the privileged domain can do this. For non-priv, the pcifront - * driver provides a PCI bus that does the call to do exactly - * this in the priv domain. */ - if (xen_initial_domain() && - HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) { - xen_free_irq(irq); - irq = -ENOSPC; - goto out; - } - - xen_irq_info_pirq_init(irq, 0, pirq, gsi, DOMID_SELF, - shareable ? PIRQ_SHAREABLE : 0); - - pirq_query_unmask(irq); - /* We try to use the handler with the appropriate semantic for the - * type of interrupt: if the interrupt is an edge triggered - * interrupt we use handle_edge_irq. - * - * On the other hand if the interrupt is level triggered we use - * handle_fasteoi_irq like the native code does for this kind of - * interrupts. - * - * Depending on the Xen version, pirq_needs_eoi might return true - * not only for level triggered interrupts but for edge triggered - * interrupts too. In any case Xen always honors the eoi mechanism, - * not injecting any more pirqs of the same kind if the first one - * hasn't received an eoi yet. Therefore using the fasteoi handler - * is the right choice either way. - */ - if (shareable) - irq_set_chip_and_handler_name(irq, &xen_pirq_chip, - handle_fasteoi_irq, name); - else - irq_set_chip_and_handler_name(irq, &xen_pirq_chip, - handle_edge_irq, name); - -out: - mutex_unlock(&irq_mapping_update_lock); - - return irq; -} - -#ifdef CONFIG_PCI_MSI -int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc) -{ - int rc; - struct physdev_get_free_pirq op_get_free_pirq; - - op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI; - rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq); - - WARN_ONCE(rc == -ENOSYS, - "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n"); - - return rc ? -1 : op_get_free_pirq.pirq; -} - -int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc, - int pirq, const char *name, domid_t domid) -{ - int irq, ret; - - mutex_lock(&irq_mapping_update_lock); - - irq = xen_allocate_irq_dynamic(); - if (irq < 0) - goto out; - - irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq, - name); - - xen_irq_info_pirq_init(irq, 0, pirq, 0, domid, 0); - ret = irq_set_msi_desc(irq, msidesc); - if (ret < 0) - goto error_irq; -out: - mutex_unlock(&irq_mapping_update_lock); - return irq; -error_irq: - mutex_unlock(&irq_mapping_update_lock); - xen_free_irq(irq); - return ret; -} -#endif - -int xen_destroy_irq(int irq) -{ - struct irq_desc *desc; - struct physdev_unmap_pirq unmap_irq; - struct irq_info *info = info_for_irq(irq); - int rc = -ENOENT; - - mutex_lock(&irq_mapping_update_lock); - - desc = irq_to_desc(irq); - if (!desc) - goto out; - - if (xen_initial_domain()) { - unmap_irq.pirq = info->u.pirq.pirq; - unmap_irq.domid = info->u.pirq.domid; - rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq); - /* If another domain quits without making the pci_disable_msix - * call, the Xen hypervisor takes care of freeing the PIRQs - * (free_domain_pirqs). - */ - if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF)) - pr_info("domain %d does not have %d anymore\n", - info->u.pirq.domid, info->u.pirq.pirq); - else if (rc) { - pr_warn("unmap irq failed %d\n", rc); - goto out; - } - } - - xen_free_irq(irq); - -out: - mutex_unlock(&irq_mapping_update_lock); - return rc; -} - -int xen_irq_from_pirq(unsigned pirq) -{ - int irq; - - struct irq_info *info; - - mutex_lock(&irq_mapping_update_lock); - - list_for_each_entry(info, &xen_irq_list_head, list) { - if (info->type != IRQT_PIRQ) - continue; - irq = info->irq; - if (info->u.pirq.pirq == pirq) - goto out; - } - irq = -1; -out: - mutex_unlock(&irq_mapping_update_lock); - - return irq; -} - - -int xen_pirq_from_irq(unsigned irq) -{ - return pirq_from_irq(irq); -} -EXPORT_SYMBOL_GPL(xen_pirq_from_irq); -int bind_evtchn_to_irq(unsigned int evtchn) -{ - int irq; - - mutex_lock(&irq_mapping_update_lock); - - irq = evtchn_to_irq[evtchn]; - - if (irq == -1) { - irq = xen_allocate_irq_dynamic(); - if (irq < 0) - goto out; - - irq_set_chip_and_handler_name(irq, &xen_dynamic_chip, - handle_edge_irq, "event"); - - xen_irq_info_evtchn_init(irq, evtchn); - } else { - struct irq_info *info = info_for_irq(irq); - WARN_ON(info == NULL || info->type != IRQT_EVTCHN); - } - -out: - mutex_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; - - mutex_lock(&irq_mapping_update_lock); - - irq = per_cpu(ipi_to_irq, cpu)[ipi]; - - if (irq == -1) { - irq = xen_allocate_irq_dynamic(); - if (irq < 0) - goto out; - - irq_set_chip_and_handler_name(irq, &xen_percpu_chip, - handle_percpu_irq, "ipi"); - - bind_ipi.vcpu = cpu; - if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi, - &bind_ipi) != 0) - BUG(); - evtchn = bind_ipi.port; - - xen_irq_info_ipi_init(cpu, irq, evtchn, ipi); - - bind_evtchn_to_cpu(evtchn, cpu); - } else { - struct irq_info *info = info_for_irq(irq); - WARN_ON(info == NULL || info->type != IRQT_IPI); - } - - out: - mutex_unlock(&irq_mapping_update_lock); - return irq; -} - -static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain, - unsigned int remote_port) -{ - struct evtchn_bind_interdomain bind_interdomain; - int err; - - bind_interdomain.remote_dom = remote_domain; - bind_interdomain.remote_port = remote_port; - - err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain, - &bind_interdomain); - - return err ? : bind_evtchn_to_irq(bind_interdomain.local_port); -} - -static int find_virq(unsigned int virq, unsigned int cpu) -{ - struct evtchn_status status; - int port, rc = -ENOENT; - - memset(&status, 0, sizeof(status)); - for (port = 0; port <= NR_EVENT_CHANNELS; port++) { - status.dom = DOMID_SELF; - status.port = port; - rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status); - if (rc < 0) - continue; - if (status.status != EVTCHNSTAT_virq) - continue; - if (status.u.virq == virq && status.vcpu == cpu) { - rc = port; - break; - } - } - return rc; -} - -int bind_virq_to_irq(unsigned int virq, unsigned int cpu) -{ - struct evtchn_bind_virq bind_virq; - int evtchn, irq, ret; - - mutex_lock(&irq_mapping_update_lock); - - irq = per_cpu(virq_to_irq, cpu)[virq]; - - if (irq == -1) { - irq = xen_allocate_irq_dynamic(); - if (irq < 0) - goto out; - - irq_set_chip_and_handler_name(irq, &xen_percpu_chip, - handle_percpu_irq, "virq"); - - bind_virq.virq = virq; - bind_virq.vcpu = cpu; - ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq, - &bind_virq); - if (ret == 0) - evtchn = bind_virq.port; - else { - if (ret == -EEXIST) - ret = find_virq(virq, cpu); - BUG_ON(ret < 0); - evtchn = ret; - } - - xen_irq_info_virq_init(cpu, irq, evtchn, virq); - - bind_evtchn_to_cpu(evtchn, cpu); - } else { - struct irq_info *info = info_for_irq(irq); - WARN_ON(info == NULL || info->type != IRQT_VIRQ); - } - -out: - mutex_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); - struct irq_info *info = irq_get_handler_data(irq); - - if (WARN_ON(!info)) - return; - - mutex_lock(&irq_mapping_update_lock); - - if (info->refcnt > 0) { - info->refcnt--; - if (info->refcnt != 0) - goto done; - } - - 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; - } - - BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND); - - xen_free_irq(irq); - - done: - mutex_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) -{ - int irq, retval; - - irq = bind_evtchn_to_irq(evtchn); - 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; -} -EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler); - -int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain, - unsigned int remote_port, - irq_handler_t handler, - unsigned long irqflags, - const char *devname, - void *dev_id) -{ - int irq, retval; - - irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port); - 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; -} -EXPORT_SYMBOL_GPL(bind_interdomain_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) -{ - int irq, retval; - - irq = bind_virq_to_irq(virq, 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; -} -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; - - irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME; - 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) -{ - struct irq_info *info = irq_get_handler_data(irq); - - if (WARN_ON(!info)) - return; - free_irq(irq, dev_id); - unbind_from_irq(irq); -} -EXPORT_SYMBOL_GPL(unbind_from_irqhandler); - -int evtchn_make_refcounted(unsigned int evtchn) -{ - int irq = evtchn_to_irq[evtchn]; - struct irq_info *info; - - if (irq == -1) - return -ENOENT; - - info = irq_get_handler_data(irq); - - if (!info) - return -ENOENT; - - WARN_ON(info->refcnt != -1); - - info->refcnt = 1; - - return 0; -} -EXPORT_SYMBOL_GPL(evtchn_make_refcounted); - -int evtchn_get(unsigned int evtchn) -{ - int irq; - struct irq_info *info; - int err = -ENOENT; - - if (evtchn >= NR_EVENT_CHANNELS) - return -EINVAL; - - mutex_lock(&irq_mapping_update_lock); - - irq = evtchn_to_irq[evtchn]; - if (irq == -1) - goto done; - - info = irq_get_handler_data(irq); - - if (!info) - goto done; - - err = -EINVAL; - if (info->refcnt <= 0) - goto done; - - info->refcnt++; - err = 0; - done: - mutex_unlock(&irq_mapping_update_lock); - - return err; -} -EXPORT_SYMBOL_GPL(evtchn_get); - -void evtchn_put(unsigned int evtchn) -{ - int irq = evtchn_to_irq[evtchn]; - if (WARN_ON(irq == -1)) - return; - unbind_from_irq(irq); -} -EXPORT_SYMBOL_GPL(evtchn_put); - -void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector) -{ - int irq; - -#ifdef CONFIG_X86 - if (unlikely(vector == XEN_NMI_VECTOR)) { - int rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi, cpu, NULL); - if (rc < 0) - printk(KERN_WARNING "Sending nmi to CPU%d failed (rc:%d)\n", cpu, rc); - return; - } -#endif - 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(); - xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu); - int i; - unsigned long flags; - static DEFINE_SPINLOCK(debug_lock); - struct vcpu_info *v; - - spin_lock_irqsave(&debug_lock, flags); - - printk("\nvcpu %d\n ", cpu); - - for_each_online_cpu(i) { - int pending; - v = per_cpu(xen_vcpu, i); - pending = (get_irq_regs() && i == cpu) - ? xen_irqs_disabled(get_irq_regs()) - : v->evtchn_upcall_mask; - printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i, - pending, v->evtchn_upcall_pending, - (int)(sizeof(v->evtchn_pending_sel)*2), - v->evtchn_pending_sel); - } - v = per_cpu(xen_vcpu, cpu); - - printk("\npending:\n "); - for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--) - printk("%0*"PRI_xen_ulong"%s", - (int)sizeof(sh->evtchn_pending[0])*2, - sh->evtchn_pending[i], - i % 8 == 0 ? "\n " : " "); - printk("\nglobal mask:\n "); - for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) - printk("%0*"PRI_xen_ulong"%s", - (int)(sizeof(sh->evtchn_mask[0])*2), - sh->evtchn_mask[i], - i % 8 == 0 ? "\n " : " "); - - printk("\nglobally unmasked:\n "); - for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) - printk("%0*"PRI_xen_ulong"%s", - (int)(sizeof(sh->evtchn_mask[0])*2), - sh->evtchn_pending[i] & ~sh->evtchn_mask[i], - i % 8 == 0 ? "\n " : " "); - - printk("\nlocal cpu%d mask:\n ", cpu); - for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--) - printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2), - cpu_evtchn[i], - i % 8 == 0 ? "\n " : " "); - - printk("\nlocally unmasked:\n "); - for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) { - xen_ulong_t pending = sh->evtchn_pending[i] - & ~sh->evtchn_mask[i] - & cpu_evtchn[i]; - printk("%0*"PRI_xen_ulong"%s", - (int)(sizeof(sh->evtchn_mask[0])*2), - pending, i % 8 == 0 ? "\n " : " "); - } - - printk("\npending list:\n"); - for (i = 0; i < NR_EVENT_CHANNELS; i++) { - if (sync_test_bit(i, BM(sh->evtchn_pending))) { - int word_idx = i / BITS_PER_EVTCHN_WORD; - printk(" %d: event %d -> irq %d%s%s%s\n", - cpu_from_evtchn(i), i, - evtchn_to_irq[i], - sync_test_bit(word_idx, BM(&v->evtchn_pending_sel)) - ? "" : " l2-clear", - !sync_test_bit(i, BM(sh->evtchn_mask)) - ? "" : " globally-masked", - sync_test_bit(i, BM(cpu_evtchn)) - ? "" : " locally-masked"); - } - } - - spin_unlock_irqrestore(&debug_lock, flags); - - return IRQ_HANDLED; -} - -static DEFINE_PER_CPU(unsigned, xed_nesting_count); -static DEFINE_PER_CPU(unsigned int, current_word_idx); -static DEFINE_PER_CPU(unsigned int, current_bit_idx); - -/* - * Mask out the i least significant bits of w - */ -#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i)) - -/* - * 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. - */ -static void __xen_evtchn_do_upcall(void) -{ - int start_word_idx, start_bit_idx; - int word_idx, bit_idx; - int i, irq; - int cpu = get_cpu(); - struct shared_info *s = HYPERVISOR_shared_info; - struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu); - unsigned count; - - do { - xen_ulong_t pending_words; - xen_ulong_t pending_bits; - struct irq_desc *desc; - - vcpu_info->evtchn_upcall_pending = 0; - - if (__this_cpu_inc_return(xed_nesting_count) - 1) - goto out; - - /* - * Master flag must be cleared /before/ clearing - * selector flag. xchg_xen_ulong must contain an - * appropriate barrier. - */ - if ((irq = per_cpu(virq_to_irq, cpu)[VIRQ_TIMER]) != -1) { - int evtchn = evtchn_from_irq(irq); - word_idx = evtchn / BITS_PER_LONG; - pending_bits = evtchn % BITS_PER_LONG; - if (active_evtchns(cpu, s, word_idx) & (1ULL << pending_bits)) { - desc = irq_to_desc(irq); - if (desc) - generic_handle_irq_desc(irq, desc); - } - } - - pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0); - - start_word_idx = __this_cpu_read(current_word_idx); - start_bit_idx = __this_cpu_read(current_bit_idx); - - word_idx = start_word_idx; - - for (i = 0; pending_words != 0; i++) { - xen_ulong_t words; - - words = MASK_LSBS(pending_words, word_idx); - - /* - * If we masked out all events, wrap to beginning. - */ - if (words == 0) { - word_idx = 0; - bit_idx = 0; - continue; - } - word_idx = EVTCHN_FIRST_BIT(words); - - pending_bits = active_evtchns(cpu, s, word_idx); - bit_idx = 0; /* usually scan entire word from start */ - /* - * We scan the starting word in two parts. - * - * 1st time: start in the middle, scanning the - * upper bits. - * - * 2nd time: scan the whole word (not just the - * parts skipped in the first pass) -- if an - * event in the previously scanned bits is - * pending again it would just be scanned on - * the next loop anyway. - */ - if (word_idx == start_word_idx) { - if (i == 0) - bit_idx = start_bit_idx; - } - - do { - xen_ulong_t bits; - int port; - - bits = MASK_LSBS(pending_bits, bit_idx); - - /* If we masked out all events, move on. */ - if (bits == 0) - break; - - bit_idx = EVTCHN_FIRST_BIT(bits); - - /* Process port. */ - port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx; - irq = evtchn_to_irq[port]; - - if (irq != -1) { - desc = irq_to_desc(irq); - if (desc) - generic_handle_irq_desc(irq, desc); - } - - bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD; - - /* Next caller starts at last processed + 1 */ - __this_cpu_write(current_word_idx, - bit_idx ? word_idx : - (word_idx+1) % BITS_PER_EVTCHN_WORD); - __this_cpu_write(current_bit_idx, bit_idx); - } while (bit_idx != 0); - - /* Scan start_l1i twice; all others once. */ - if ((word_idx != start_word_idx) || (i != 0)) - pending_words &= ~(1UL << word_idx); - - word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD; - } - - BUG_ON(!irqs_disabled()); - - count = __this_cpu_read(xed_nesting_count); - __this_cpu_write(xed_nesting_count, 0); - } while (count != 1 || vcpu_info->evtchn_upcall_pending); - -out: - - put_cpu(); -} - -void xen_evtchn_do_upcall(struct pt_regs *regs) -{ - struct pt_regs *old_regs = set_irq_regs(regs); - - irq_enter(); -#ifdef CONFIG_X86 - exit_idle(); -#endif - - __xen_evtchn_do_upcall(); - - irq_exit(); - set_irq_regs(old_regs); -} - -void xen_hvm_evtchn_do_upcall(void) -{ - __xen_evtchn_do_upcall(); -} -EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall); - -/* 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); - - if (WARN_ON(!info)) - return; - - /* Make sure the irq is masked, since the new event channel - will also be masked. */ - disable_irq(irq); - - mutex_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); - - xen_irq_info_evtchn_init(irq, evtchn); - - mutex_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); - int masked; - - if (!VALID_EVTCHN(evtchn)) - return -1; - - /* - * Events delivered via platform PCI interrupts are always - * routed to vcpu 0 and hence cannot be rebound. - */ - if (xen_hvm_domain() && !xen_have_vector_callback) - return -1; - - /* Send future instances of this interrupt to other vcpu. */ - bind_vcpu.port = evtchn; - bind_vcpu.vcpu = tcpu; - - /* - * Mask the event while changing the VCPU binding to prevent - * it being delivered on an unexpected VCPU. - */ - masked = test_and_set_mask(evtchn); - - /* - * 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); - - if (!masked) - unmask_evtchn(evtchn); - - return 0; -} - -static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest, - bool force) -{ - unsigned tcpu = cpumask_first(dest); - - return rebind_irq_to_cpu(data->irq, tcpu); -} - -static int retrigger_evtchn(int evtchn) -{ - int masked; - - if (!VALID_EVTCHN(evtchn)) - return 0; - - masked = test_and_set_mask(evtchn); - set_evtchn(evtchn); - if (!masked) - unmask_evtchn(evtchn); - - return 1; -} - -int resend_irq_on_evtchn(unsigned int irq) -{ - return retrigger_evtchn(evtchn_from_irq(irq)); -} - -static void enable_dynirq(struct irq_data *data) -{ - int evtchn = evtchn_from_irq(data->irq); - - if (VALID_EVTCHN(evtchn)) - unmask_evtchn(evtchn); -} - -static void disable_dynirq(struct irq_data *data) -{ - int evtchn = evtchn_from_irq(data->irq); - - if (VALID_EVTCHN(evtchn)) - mask_evtchn(evtchn); -} - -static void ack_dynirq(struct irq_data *data) -{ - int evtchn = evtchn_from_irq(data->irq); - - irq_move_irq(data); - - if (VALID_EVTCHN(evtchn)) - clear_evtchn(evtchn); -} - -static void mask_ack_dynirq(struct irq_data *data) -{ - disable_dynirq(data); - ack_dynirq(data); -} - -static int retrigger_dynirq(struct irq_data *data) -{ - return retrigger_evtchn(evtchn_from_irq(data->irq)); -} - -static void restore_pirqs(void) -{ - int pirq, rc, irq, gsi; - struct physdev_map_pirq map_irq; - struct irq_info *info; - - list_for_each_entry(info, &xen_irq_list_head, list) { - if (info->type != IRQT_PIRQ) - continue; - - pirq = info->u.pirq.pirq; - gsi = info->u.pirq.gsi; - irq = info->irq; - - /* save/restore of PT devices doesn't work, so at this point the - * only devices present are GSI based emulated devices */ - if (!gsi) - continue; - - map_irq.domid = DOMID_SELF; - map_irq.type = MAP_PIRQ_TYPE_GSI; - map_irq.index = gsi; - map_irq.pirq = pirq; - - rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq); - if (rc) { - pr_warn("xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n", - gsi, irq, pirq, rc); - xen_free_irq(irq); - continue; - } - - printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq); - - __startup_pirq(irq); - } -} - -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. */ - xen_irq_info_virq_init(cpu, irq, evtchn, virq); - bind_evtchn_to_cpu(evtchn, cpu); - } -} - -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. */ - xen_irq_info_ipi_init(cpu, irq, evtchn, ipi); - bind_evtchn_to_cpu(evtchn, cpu); - } -} - -/* 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); -} -EXPORT_SYMBOL(xen_clear_irq_pending); -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 with timeout. In the usual case, - * the irq will be disabled so it won't deliver an interrupt. */ -void xen_poll_irq_timeout(int irq, u64 timeout) -{ - evtchn_port_t evtchn = evtchn_from_irq(irq); - - if (VALID_EVTCHN(evtchn)) { - struct sched_poll poll; - - poll.nr_ports = 1; - poll.timeout = timeout; - set_xen_guest_handle(poll.ports, &evtchn); - - if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0) - BUG(); - } -} -EXPORT_SYMBOL(xen_poll_irq_timeout); -/* 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) -{ - xen_poll_irq_timeout(irq, 0 /* no timeout */); -} - -/* Check whether the IRQ line is shared with other guests. */ -int xen_test_irq_shared(int irq) -{ - struct irq_info *info = info_for_irq(irq); - struct physdev_irq_status_query irq_status; - - if (WARN_ON(!info)) - return -ENOENT; - - irq_status.irq = info->u.pirq.pirq; - - if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status)) - return 0; - return !(irq_status.flags & XENIRQSTAT_shared); -} -EXPORT_SYMBOL_GPL(xen_test_irq_shared); - -void xen_irq_resume(void) -{ - unsigned int cpu, evtchn; - struct irq_info *info; - - /* New event-channel space is not 'live' yet. */ - for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++) - mask_evtchn(evtchn); - - /* No IRQ <-> event-channel mappings. */ - list_for_each_entry(info, &xen_irq_list_head, list) - info->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); - } - - restore_pirqs(); -} - -static struct irq_chip xen_dynamic_chip __read_mostly = { - .name = "xen-dyn", - - .irq_disable = disable_dynirq, - .irq_mask = disable_dynirq, - .irq_unmask = enable_dynirq, - - .irq_ack = ack_dynirq, - .irq_mask_ack = mask_ack_dynirq, - - .irq_set_affinity = set_affinity_irq, - .irq_retrigger = retrigger_dynirq, -}; - -static struct irq_chip xen_pirq_chip __read_mostly = { - .name = "xen-pirq", - - .irq_startup = startup_pirq, - .irq_shutdown = shutdown_pirq, - .irq_enable = enable_pirq, - .irq_disable = disable_pirq, - - .irq_mask = disable_dynirq, - .irq_unmask = enable_dynirq, - - .irq_ack = eoi_pirq, - .irq_eoi = eoi_pirq, - .irq_mask_ack = mask_ack_pirq, - - .irq_set_affinity = set_affinity_irq, - - .irq_retrigger = retrigger_dynirq, -}; - -static struct irq_chip xen_percpu_chip __read_mostly = { - .name = "xen-percpu", - - .irq_disable = disable_dynirq, - .irq_mask = disable_dynirq, - .irq_unmask = enable_dynirq, - - .irq_ack = ack_dynirq, -}; - -int xen_set_callback_via(uint64_t via) -{ - struct xen_hvm_param a; - a.domid = DOMID_SELF; - a.index = HVM_PARAM_CALLBACK_IRQ; - a.value = via; - return HYPERVISOR_hvm_op(HVMOP_set_param, &a); -} -EXPORT_SYMBOL_GPL(xen_set_callback_via); - -#ifdef CONFIG_XEN_PVHVM -/* Vector callbacks are better than PCI interrupts to receive event - * channel notifications because we can receive vector callbacks on any - * vcpu and we don't need PCI support or APIC interactions. */ -void xen_callback_vector(void) -{ - int rc; - uint64_t callback_via; - if (xen_have_vector_callback) { - callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR); - rc = xen_set_callback_via(callback_via); - if (rc) { - pr_err("Request for Xen HVM callback vector failed\n"); - xen_have_vector_callback = 0; - return; - } - pr_info("Xen HVM callback vector for event delivery is enabled\n"); - /* in the restore case the vector has already been allocated */ - if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors)) - alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, - xen_hvm_callback_vector); - } -} -#else -void xen_callback_vector(void) {} -#endif - -void __init xen_init_IRQ(void) -{ - int i; - - evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq), - GFP_KERNEL); - BUG_ON(!evtchn_to_irq); - for (i = 0; i < NR_EVENT_CHANNELS; i++) - evtchn_to_irq[i] = -1; - - /* No event channels are 'live' right now. */ - for (i = 0; i < NR_EVENT_CHANNELS; i++) - mask_evtchn(i); - - pirq_needs_eoi = pirq_needs_eoi_flag; - -#ifdef CONFIG_X86 - if (xen_hvm_domain()) { - xen_callback_vector(); - native_init_IRQ(); - /* pci_xen_hvm_init must be called after native_init_IRQ so that - * __acpi_register_gsi can point at the right function */ - pci_xen_hvm_init(); - } else { - int rc; - struct physdev_pirq_eoi_gmfn eoi_gmfn; - - irq_ctx_init(smp_processor_id()); - if (xen_initial_domain()) - pci_xen_initial_domain(); - - pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO); - eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map); - rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn); - if (rc != 0) { - free_page((unsigned long) pirq_eoi_map); - pirq_eoi_map = NULL; - } else - pirq_needs_eoi = pirq_check_eoi_map; - } -#endif -} -- cgit 1.4.1