diff options
Diffstat (limited to 'drivers/xen/events/events_base.c')
| -rw-r--r-- | drivers/xen/events/events_base.c | 96 |
1 files changed, 43 insertions, 53 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index c3458f58de9..c919d3d5c84 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -388,29 +388,22 @@ static void xen_irq_init(unsigned irq) list_add_tail(&info->list, &xen_irq_list_head); } -static int __must_check xen_allocate_irq_dynamic(void) +static int __must_check xen_allocate_irqs_dynamic(int nvec) { - int first = 0; - int irq; + int i, irq = irq_alloc_descs(-1, 0, nvec, -1); -#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 + if (irq >= 0) { + for (i = 0; i < nvec; i++) + xen_irq_init(irq + i); + } - irq = irq_alloc_desc_from(first, -1); + return irq; +} - if (irq >= 0) - xen_irq_init(irq); +static inline int __must_check xen_allocate_irq_dynamic(void) +{ - return irq; + return xen_allocate_irqs_dynamic(1); } static int __must_check xen_allocate_irq_gsi(unsigned gsi) @@ -466,9 +459,6 @@ static void xen_evtchn_close(unsigned int port) close.port = port; if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0) BUG(); - - /* Closed ports are implicitly re-bound to VCPU0. */ - bind_evtchn_to_cpu(port, 0); } static void pirq_query_unmask(int irq) @@ -730,22 +720,25 @@ int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc) } int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc, - int pirq, const char *name, domid_t domid) + int pirq, int nvec, const char *name, domid_t domid) { - int irq, ret; + int i, irq, ret; mutex_lock(&irq_mapping_update_lock); - irq = xen_allocate_irq_dynamic(); + irq = xen_allocate_irqs_dynamic(nvec); if (irq < 0) goto out; - irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq, - name); + for (i = 0; i < nvec; i++) { + irq_set_chip_and_handler_name(irq + i, &xen_pirq_chip, handle_edge_irq, name); + + ret = xen_irq_info_pirq_setup(irq + i, 0, pirq + i, 0, domid, + i == 0 ? 0 : PIRQ_MSI_GROUP); + if (ret < 0) + goto error_irq; + } - ret = xen_irq_info_pirq_setup(irq, 0, pirq, 0, domid, 0); - if (ret < 0) - goto error_irq; ret = irq_set_msi_desc(irq, msidesc); if (ret < 0) goto error_irq; @@ -753,7 +746,8 @@ out: mutex_unlock(&irq_mapping_update_lock); return irq; error_irq: - __unbind_from_irq(irq); + for (; i >= 0; i--) + __unbind_from_irq(irq + i); mutex_unlock(&irq_mapping_update_lock); return ret; } @@ -767,7 +761,12 @@ int xen_destroy_irq(int irq) mutex_lock(&irq_mapping_update_lock); - if (xen_initial_domain()) { + /* + * If trying to remove a vector in a MSI group different + * than the first one skip the PIRQ unmap unless this vector + * is the first one in the group. + */ + if (xen_initial_domain() && !(info->u.pirq.flags & PIRQ_MSI_GROUP)) { unmap_irq.pirq = info->u.pirq.pirq; unmap_irq.domid = info->u.pirq.domid; rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq); @@ -1234,8 +1233,8 @@ void xen_evtchn_do_upcall(struct pt_regs *regs) irq_enter(); #ifdef CONFIG_X86 exit_idle(); -#endif inc_irq_stat(irq_hv_callback_count); +#endif __xen_evtchn_do_upcall(); @@ -1329,26 +1328,6 @@ static int set_affinity_irq(struct irq_data *data, const struct cpumask *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); @@ -1383,7 +1362,18 @@ static void mask_ack_dynirq(struct irq_data *data) static int retrigger_dynirq(struct irq_data *data) { - return retrigger_evtchn(evtchn_from_irq(data->irq)); + unsigned int evtchn = evtchn_from_irq(data->irq); + int masked; + + if (!VALID_EVTCHN(evtchn)) + return 0; + + masked = test_and_set_mask(evtchn); + set_evtchn(evtchn); + if (!masked) + unmask_evtchn(evtchn); + + return 1; } static void restore_pirqs(void) |