mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
Merge branches 'stable/irq.fairness' and 'stable/irq.ween_of_nr_irqs' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
* 'stable/irq.fairness' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen: events: Remove redundant clear of l2i at end of round-robin loop xen: events: Make round-robin scan fairer by snapshotting each l2 word once only xen: events: Clean up round-robin evtchn scan. xen: events: Make last processed event channel a per-cpu variable. xen: events: Process event channels notifications in round-robin order. * 'stable/irq.ween_of_nr_irqs' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen: events: Fix compile error if CONFIG_SMP is not defined. xen: events: correct locking in xen_irq_from_pirq xen: events: propagate irq allocation failure instead of panicking xen: events: do not workaround too-small nr_irqs xen: events: remove use of nr_irqs as upper bound on number of pirqs xen: events: dynamically allocate irq info structures xen: events: maintain a list of Xen interrupts xen: events: push setup of irq<->{evtchn,ipi,virq,pirq} maps into irq_info init functions xen: events: turn irq_info constructors into initialiser functions xen: events: use per-cpu variable for cpu_evtchn_mask xen: events: refactor GSI pirq bindings functions xen: events: rename restore_cpu_pirqs -> restore_pirqs xen: events: remove unused public functions xen: events: fix xen_map_pirq_gsi error return xen: events: simplify comment xen: events: separate two unrelated halves of if condition Fix up trivial conflicts in drivers/xen/events.c
This commit is contained in:
commit
5a39837f76
3 changed files with 302 additions and 206 deletions
|
@ -50,7 +50,7 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
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name = "ioapic-level";
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}
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irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
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irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
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printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
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@ -237,6 +237,7 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev)
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{
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int rc;
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int share = 1;
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int pirq;
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u8 gsi;
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rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
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@ -246,13 +247,21 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev)
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return rc;
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}
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rc = xen_allocate_pirq_gsi(gsi);
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
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gsi, rc);
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return rc;
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}
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pirq = rc;
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if (gsi < NR_IRQS_LEGACY)
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share = 0;
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rc = xen_allocate_pirq(gsi, share, "pcifront");
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rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
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if (rc < 0) {
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dev_warn(&dev->dev, "Xen PCI: failed to register GSI%d: %d\n",
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gsi, rc);
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dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
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gsi, pirq, rc);
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return rc;
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}
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@ -309,7 +318,7 @@ int __init pci_xen_hvm_init(void)
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#ifdef CONFIG_XEN_DOM0
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static int xen_register_pirq(u32 gsi, int triggering)
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{
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int rc, irq;
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int rc, pirq, irq = -1;
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struct physdev_map_pirq map_irq;
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int shareable = 0;
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char *name;
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@ -325,17 +334,20 @@ static int xen_register_pirq(u32 gsi, int triggering)
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name = "ioapic-level";
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}
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irq = xen_allocate_pirq(gsi, shareable, name);
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printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
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pirq = xen_allocate_pirq_gsi(gsi);
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if (pirq < 0)
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goto out;
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irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
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if (irq < 0)
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goto out;
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printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d\n", pirq, irq);
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map_irq.domid = DOMID_SELF;
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map_irq.type = MAP_PIRQ_TYPE_GSI;
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map_irq.index = gsi;
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map_irq.pirq = irq;
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map_irq.pirq = pirq;
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rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
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if (rc) {
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@ -422,13 +434,18 @@ static int __init pci_xen_initial_domain(void)
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void __init xen_setup_pirqs(void)
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{
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int irq;
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int pirq, irq;
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pci_xen_initial_domain();
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if (0 == nr_ioapics) {
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for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
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xen_allocate_pirq(irq, 0, "xt-pic");
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for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
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pirq = xen_allocate_pirq_gsi(irq);
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if (WARN(pirq < 0,
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"Could not allocate PIRQ for legacy interrupt\n"))
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break;
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irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");
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}
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return;
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}
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@ -56,6 +56,8 @@
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*/
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static DEFINE_SPINLOCK(irq_mapping_update_lock);
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static LIST_HEAD(xen_irq_list_head);
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/* IRQ <-> VIRQ mapping. */
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static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
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@ -85,7 +87,9 @@ enum xen_irq_type {
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*/
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struct irq_info
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{
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struct list_head list;
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enum xen_irq_type type; /* type */
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unsigned irq;
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unsigned short evtchn; /* event channel */
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unsigned short cpu; /* cpu bound */
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@ -103,23 +107,10 @@ struct irq_info
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#define PIRQ_NEEDS_EOI (1 << 0)
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#define PIRQ_SHAREABLE (1 << 1)
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static struct irq_info *irq_info;
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static int *pirq_to_irq;
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static int *evtchn_to_irq;
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struct cpu_evtchn_s {
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unsigned long bits[NR_EVENT_CHANNELS/BITS_PER_LONG];
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};
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static __initdata struct cpu_evtchn_s init_evtchn_mask = {
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.bits[0 ... (NR_EVENT_CHANNELS/BITS_PER_LONG)-1] = ~0ul,
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};
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static struct cpu_evtchn_s __refdata *cpu_evtchn_mask_p = &init_evtchn_mask;
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static inline unsigned long *cpu_evtchn_mask(int cpu)
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{
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return cpu_evtchn_mask_p[cpu].bits;
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}
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static DEFINE_PER_CPU(unsigned long [NR_EVENT_CHANNELS/BITS_PER_LONG],
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cpu_evtchn_mask);
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/* Xen will never allocate port zero for any purpose. */
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#define VALID_EVTCHN(chn) ((chn) != 0)
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@ -128,46 +119,86 @@ static struct irq_chip xen_dynamic_chip;
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static struct irq_chip xen_percpu_chip;
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static struct irq_chip xen_pirq_chip;
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/* Constructor for packed IRQ information. */
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static struct irq_info mk_unbound_info(void)
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/* Get info for IRQ */
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static struct irq_info *info_for_irq(unsigned irq)
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{
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return (struct irq_info) { .type = IRQT_UNBOUND };
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return get_irq_data(irq);
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}
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static struct irq_info mk_evtchn_info(unsigned short evtchn)
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/* Constructors for packed IRQ information. */
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static void xen_irq_info_common_init(struct irq_info *info,
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unsigned irq,
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enum xen_irq_type type,
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unsigned short evtchn,
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unsigned short cpu)
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{
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return (struct irq_info) { .type = IRQT_EVTCHN, .evtchn = evtchn,
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.cpu = 0 };
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BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
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info->type = type;
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info->irq = irq;
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info->evtchn = evtchn;
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info->cpu = cpu;
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evtchn_to_irq[evtchn] = irq;
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}
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static struct irq_info mk_ipi_info(unsigned short evtchn, enum ipi_vector ipi)
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static void xen_irq_info_evtchn_init(unsigned irq,
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unsigned short evtchn)
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{
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return (struct irq_info) { .type = IRQT_IPI, .evtchn = evtchn,
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.cpu = 0, .u.ipi = ipi };
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struct irq_info *info = info_for_irq(irq);
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xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0);
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}
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static struct irq_info mk_virq_info(unsigned short evtchn, unsigned short virq)
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static void xen_irq_info_ipi_init(unsigned cpu,
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unsigned irq,
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unsigned short evtchn,
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enum ipi_vector ipi)
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{
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return (struct irq_info) { .type = IRQT_VIRQ, .evtchn = evtchn,
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.cpu = 0, .u.virq = virq };
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struct irq_info *info = info_for_irq(irq);
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xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0);
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info->u.ipi = ipi;
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per_cpu(ipi_to_irq, cpu)[ipi] = irq;
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}
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static struct irq_info mk_pirq_info(unsigned short evtchn, unsigned short pirq,
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unsigned short gsi, unsigned short vector)
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static void xen_irq_info_virq_init(unsigned cpu,
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unsigned irq,
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unsigned short evtchn,
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unsigned short virq)
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{
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return (struct irq_info) { .type = IRQT_PIRQ, .evtchn = evtchn,
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.cpu = 0,
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.u.pirq = { .pirq = pirq, .gsi = gsi, .vector = vector } };
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struct irq_info *info = info_for_irq(irq);
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xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0);
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info->u.virq = virq;
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per_cpu(virq_to_irq, cpu)[virq] = irq;
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}
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static void xen_irq_info_pirq_init(unsigned irq,
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unsigned short evtchn,
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unsigned short pirq,
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unsigned short gsi,
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unsigned short vector,
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unsigned char flags)
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{
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struct irq_info *info = info_for_irq(irq);
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xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0);
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info->u.pirq.pirq = pirq;
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info->u.pirq.gsi = gsi;
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info->u.pirq.vector = vector;
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info->u.pirq.flags = flags;
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}
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/*
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* Accessors for packed IRQ information.
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*/
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static struct irq_info *info_for_irq(unsigned irq)
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{
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return &irq_info[irq];
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}
|
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|
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static unsigned int evtchn_from_irq(unsigned irq)
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{
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if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
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|
@ -212,26 +243,6 @@ static unsigned pirq_from_irq(unsigned irq)
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return info->u.pirq.pirq;
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}
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|
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static unsigned gsi_from_irq(unsigned irq)
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{
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struct irq_info *info = info_for_irq(irq);
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BUG_ON(info == NULL);
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BUG_ON(info->type != IRQT_PIRQ);
|
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|
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return info->u.pirq.gsi;
|
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}
|
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|
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static unsigned vector_from_irq(unsigned irq)
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{
|
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struct irq_info *info = info_for_irq(irq);
|
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|
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BUG_ON(info == NULL);
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BUG_ON(info->type != IRQT_PIRQ);
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|
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return info->u.pirq.vector;
|
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}
|
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|
||||
static enum xen_irq_type type_from_irq(unsigned irq)
|
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{
|
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return info_for_irq(irq)->type;
|
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|
@ -267,7 +278,7 @@ static inline unsigned long active_evtchns(unsigned int cpu,
|
|||
unsigned int idx)
|
||||
{
|
||||
return (sh->evtchn_pending[idx] &
|
||||
cpu_evtchn_mask(cpu)[idx] &
|
||||
per_cpu(cpu_evtchn_mask, cpu)[idx] &
|
||||
~sh->evtchn_mask[idx]);
|
||||
}
|
||||
|
||||
|
@ -280,28 +291,28 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
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|||
cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
|
||||
#endif
|
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|
||||
clear_bit(chn, cpu_evtchn_mask(cpu_from_irq(irq)));
|
||||
set_bit(chn, cpu_evtchn_mask(cpu));
|
||||
clear_bit(chn, per_cpu(cpu_evtchn_mask, cpu_from_irq(irq)));
|
||||
set_bit(chn, per_cpu(cpu_evtchn_mask, cpu));
|
||||
|
||||
irq_info[irq].cpu = cpu;
|
||||
info_for_irq(irq)->cpu = cpu;
|
||||
}
|
||||
|
||||
static void init_evtchn_cpu_bindings(void)
|
||||
{
|
||||
int i;
|
||||
#ifdef CONFIG_SMP
|
||||
struct irq_desc *desc;
|
||||
struct irq_info *info;
|
||||
|
||||
/* By default all event channels notify CPU#0. */
|
||||
for_each_irq_desc(i, desc) {
|
||||
list_for_each_entry(info, &xen_irq_list_head, list) {
|
||||
struct irq_desc *desc = irq_to_desc(info->irq);
|
||||
cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
|
||||
}
|
||||
#endif
|
||||
|
||||
for_each_possible_cpu(i)
|
||||
memset(cpu_evtchn_mask(i),
|
||||
(i == 0) ? ~0 : 0, sizeof(struct cpu_evtchn_s));
|
||||
|
||||
memset(per_cpu(cpu_evtchn_mask, i),
|
||||
(i == 0) ? ~0 : 0, sizeof(*per_cpu(cpu_evtchn_mask, i)));
|
||||
}
|
||||
|
||||
static inline void clear_evtchn(int port)
|
||||
|
@ -376,7 +387,28 @@ static void unmask_evtchn(int port)
|
|||
put_cpu();
|
||||
}
|
||||
|
||||
static int xen_allocate_irq_dynamic(void)
|
||||
static void xen_irq_init(unsigned irq)
|
||||
{
|
||||
struct irq_info *info;
|
||||
struct irq_desc *desc = irq_to_desc(irq);
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
/* 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;
|
||||
|
||||
set_irq_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;
|
||||
|
@ -393,22 +425,14 @@ static int xen_allocate_irq_dynamic(void)
|
|||
first = get_nr_irqs_gsi();
|
||||
#endif
|
||||
|
||||
retry:
|
||||
irq = irq_alloc_desc_from(first, -1);
|
||||
|
||||
if (irq == -ENOMEM && first > NR_IRQS_LEGACY) {
|
||||
printk(KERN_ERR "Out of dynamic IRQ space and eating into GSI space. You should increase nr_irqs\n");
|
||||
first = max(NR_IRQS_LEGACY, first - NR_IRQS_LEGACY);
|
||||
goto retry;
|
||||
}
|
||||
|
||||
if (irq < 0)
|
||||
panic("No available IRQ to bind to: increase nr_irqs!\n");
|
||||
xen_irq_init(irq);
|
||||
|
||||
return irq;
|
||||
}
|
||||
|
||||
static int xen_allocate_irq_gsi(unsigned gsi)
|
||||
static int __must_check xen_allocate_irq_gsi(unsigned gsi)
|
||||
{
|
||||
int irq;
|
||||
|
||||
|
@ -423,17 +447,25 @@ static int xen_allocate_irq_gsi(unsigned gsi)
|
|||
|
||||
/* Legacy IRQ descriptors are already allocated by the arch. */
|
||||
if (gsi < NR_IRQS_LEGACY)
|
||||
return gsi;
|
||||
irq = gsi;
|
||||
else
|
||||
irq = irq_alloc_desc_at(gsi, -1);
|
||||
|
||||
irq = irq_alloc_desc_at(gsi, -1);
|
||||
if (irq < 0)
|
||||
panic("Unable to allocate to IRQ%d (%d)\n", gsi, irq);
|
||||
xen_irq_init(irq);
|
||||
|
||||
return irq;
|
||||
}
|
||||
|
||||
static void xen_free_irq(unsigned irq)
|
||||
{
|
||||
struct irq_info *info = get_irq_data(irq);
|
||||
|
||||
list_del(&info->list);
|
||||
|
||||
set_irq_data(irq, NULL);
|
||||
|
||||
kfree(info);
|
||||
|
||||
/* Legacy IRQ descriptors are managed by the arch. */
|
||||
if (irq < NR_IRQS_LEGACY)
|
||||
return;
|
||||
|
@ -563,51 +595,39 @@ static void ack_pirq(struct irq_data *data)
|
|||
|
||||
static int find_irq_by_gsi(unsigned gsi)
|
||||
{
|
||||
int irq;
|
||||
struct irq_info *info;
|
||||
|
||||
for (irq = 0; irq < nr_irqs; irq++) {
|
||||
struct irq_info *info = info_for_irq(irq);
|
||||
|
||||
if (info == NULL || info->type != IRQT_PIRQ)
|
||||
list_for_each_entry(info, &xen_irq_list_head, list) {
|
||||
if (info->type != IRQT_PIRQ)
|
||||
continue;
|
||||
|
||||
if (gsi_from_irq(irq) == gsi)
|
||||
return irq;
|
||||
if (info->u.pirq.gsi == gsi)
|
||||
return info->irq;
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
|
||||
int xen_allocate_pirq_gsi(unsigned gsi)
|
||||
{
|
||||
return xen_map_pirq_gsi(gsi, gsi, shareable, name);
|
||||
return gsi;
|
||||
}
|
||||
|
||||
/* xen_map_pirq_gsi might allocate irqs from the top down, as a
|
||||
* consequence don't assume that the irq number returned has a low value
|
||||
* or can be used as a pirq number unless you know otherwise.
|
||||
*
|
||||
* One notable exception is when xen_map_pirq_gsi is called passing an
|
||||
* hardware gsi as argument, in that case the irq number returned
|
||||
* matches the gsi number passed as second argument.
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
|
||||
int xen_bind_pirq_gsi_to_irq(unsigned gsi,
|
||||
unsigned pirq, int shareable, char *name)
|
||||
{
|
||||
int irq = 0;
|
||||
int irq = -1;
|
||||
struct physdev_irq irq_op;
|
||||
|
||||
spin_lock(&irq_mapping_update_lock);
|
||||
|
||||
if ((pirq > nr_irqs) || (gsi > nr_irqs)) {
|
||||
printk(KERN_WARNING "xen_map_pirq_gsi: %s %s is incorrect!\n",
|
||||
pirq > nr_irqs ? "pirq" :"",
|
||||
gsi > nr_irqs ? "gsi" : "");
|
||||
goto out;
|
||||
}
|
||||
|
||||
irq = find_irq_by_gsi(gsi);
|
||||
if (irq != -1) {
|
||||
printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n",
|
||||
|
@ -616,6 +636,8 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
|
|||
}
|
||||
|
||||
irq = xen_allocate_irq_gsi(gsi);
|
||||
if (irq < 0)
|
||||
goto out;
|
||||
|
||||
set_irq_chip_and_handler_name(irq, &xen_pirq_chip,
|
||||
handle_level_irq, name);
|
||||
|
@ -633,9 +655,8 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
|
|||
goto out;
|
||||
}
|
||||
|
||||
irq_info[irq] = mk_pirq_info(0, pirq, gsi, irq_op.vector);
|
||||
irq_info[irq].u.pirq.flags |= shareable ? PIRQ_SHAREABLE : 0;
|
||||
pirq_to_irq[pirq] = irq;
|
||||
xen_irq_info_pirq_init(irq, 0, pirq, gsi, irq_op.vector,
|
||||
shareable ? PIRQ_SHAREABLE : 0);
|
||||
|
||||
out:
|
||||
spin_unlock(&irq_mapping_update_lock);
|
||||
|
@ -672,8 +693,7 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
|
|||
set_irq_chip_and_handler_name(irq, &xen_pirq_chip,
|
||||
handle_level_irq, name);
|
||||
|
||||
irq_info[irq] = mk_pirq_info(0, pirq, 0, vector);
|
||||
pirq_to_irq[pirq] = irq;
|
||||
xen_irq_info_pirq_init(irq, 0, pirq, 0, vector, 0);
|
||||
ret = irq_set_msi_desc(irq, msidesc);
|
||||
if (ret < 0)
|
||||
goto error_irq;
|
||||
|
@ -709,9 +729,6 @@ int xen_destroy_irq(int irq)
|
|||
goto out;
|
||||
}
|
||||
}
|
||||
pirq_to_irq[info->u.pirq.pirq] = -1;
|
||||
|
||||
irq_info[irq] = mk_unbound_info();
|
||||
|
||||
xen_free_irq(irq);
|
||||
|
||||
|
@ -720,19 +737,26 @@ int xen_destroy_irq(int irq)
|
|||
return rc;
|
||||
}
|
||||
|
||||
int xen_vector_from_irq(unsigned irq)
|
||||
{
|
||||
return vector_from_irq(irq);
|
||||
}
|
||||
|
||||
int xen_gsi_from_irq(unsigned irq)
|
||||
{
|
||||
return gsi_from_irq(irq);
|
||||
}
|
||||
|
||||
int xen_irq_from_pirq(unsigned pirq)
|
||||
{
|
||||
return pirq_to_irq[pirq];
|
||||
int irq;
|
||||
|
||||
struct irq_info *info;
|
||||
|
||||
spin_lock(&irq_mapping_update_lock);
|
||||
|
||||
list_for_each_entry(info, &xen_irq_list_head, list) {
|
||||
if (info == NULL || info->type != IRQT_PIRQ)
|
||||
continue;
|
||||
irq = info->irq;
|
||||
if (info->u.pirq.pirq == pirq)
|
||||
goto out;
|
||||
}
|
||||
irq = -1;
|
||||
out:
|
||||
spin_unlock(&irq_mapping_update_lock);
|
||||
|
||||
return irq;
|
||||
}
|
||||
|
||||
int bind_evtchn_to_irq(unsigned int evtchn)
|
||||
|
@ -745,14 +769,16 @@ int bind_evtchn_to_irq(unsigned int evtchn)
|
|||
|
||||
if (irq == -1) {
|
||||
irq = xen_allocate_irq_dynamic();
|
||||
if (irq == -1)
|
||||
goto out;
|
||||
|
||||
set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
|
||||
handle_fasteoi_irq, "event");
|
||||
|
||||
evtchn_to_irq[evtchn] = irq;
|
||||
irq_info[irq] = mk_evtchn_info(evtchn);
|
||||
xen_irq_info_evtchn_init(irq, evtchn);
|
||||
}
|
||||
|
||||
out:
|
||||
spin_unlock(&irq_mapping_update_lock);
|
||||
|
||||
return irq;
|
||||
|
@ -782,9 +808,7 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
|
|||
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;
|
||||
xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
|
||||
|
||||
bind_evtchn_to_cpu(evtchn, cpu);
|
||||
}
|
||||
|
@ -821,6 +845,8 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
|
|||
|
||||
if (irq == -1) {
|
||||
irq = xen_allocate_irq_dynamic();
|
||||
if (irq == -1)
|
||||
goto out;
|
||||
|
||||
set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
|
||||
handle_percpu_irq, "virq");
|
||||
|
@ -832,14 +858,12 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
|
|||
BUG();
|
||||
evtchn = bind_virq.port;
|
||||
|
||||
evtchn_to_irq[evtchn] = irq;
|
||||
irq_info[irq] = mk_virq_info(evtchn, virq);
|
||||
|
||||
per_cpu(virq_to_irq, cpu)[virq] = irq;
|
||||
xen_irq_info_virq_init(cpu, irq, evtchn, virq);
|
||||
|
||||
bind_evtchn_to_cpu(evtchn, cpu);
|
||||
}
|
||||
|
||||
out:
|
||||
spin_unlock(&irq_mapping_update_lock);
|
||||
|
||||
return irq;
|
||||
|
@ -876,11 +900,9 @@ static void unbind_from_irq(unsigned int irq)
|
|||
evtchn_to_irq[evtchn] = -1;
|
||||
}
|
||||
|
||||
if (irq_info[irq].type != IRQT_UNBOUND) {
|
||||
irq_info[irq] = mk_unbound_info();
|
||||
BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
|
||||
|
||||
xen_free_irq(irq);
|
||||
}
|
||||
xen_free_irq(irq);
|
||||
|
||||
spin_unlock(&irq_mapping_update_lock);
|
||||
}
|
||||
|
@ -894,6 +916,8 @@ int bind_evtchn_to_irqhandler(unsigned int evtchn,
|
|||
int 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);
|
||||
|
@ -935,6 +959,8 @@ int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
|
|||
int 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);
|
||||
|
@ -986,7 +1012,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
|
|||
{
|
||||
struct shared_info *sh = HYPERVISOR_shared_info;
|
||||
int cpu = smp_processor_id();
|
||||
unsigned long *cpu_evtchn = cpu_evtchn_mask(cpu);
|
||||
unsigned long *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
|
||||
int i;
|
||||
unsigned long flags;
|
||||
static DEFINE_SPINLOCK(debug_lock);
|
||||
|
@ -1064,6 +1090,13 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
|
|||
}
|
||||
|
||||
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 & ((~0UL) << i))
|
||||
|
||||
/*
|
||||
* Search the CPUs pending events bitmasks. For each one found, map
|
||||
|
@ -1076,6 +1109,9 @@ static DEFINE_PER_CPU(unsigned, xed_nesting_count);
|
|||
*/
|
||||
static void __xen_evtchn_do_upcall(void)
|
||||
{
|
||||
int start_word_idx, start_bit_idx;
|
||||
int word_idx, bit_idx;
|
||||
int i;
|
||||
int cpu = get_cpu();
|
||||
struct shared_info *s = HYPERVISOR_shared_info;
|
||||
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
|
||||
|
@ -1094,17 +1130,57 @@ static void __xen_evtchn_do_upcall(void)
|
|||
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];
|
||||
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++) {
|
||||
unsigned long pending_bits;
|
||||
unsigned long 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 = __ffs(words);
|
||||
|
||||
pending_bits = active_evtchns(cpu, s, word_idx);
|
||||
bit_idx = 0; /* usually scan entire word from start */
|
||||
if (word_idx == start_word_idx) {
|
||||
/* We scan the starting word in two parts */
|
||||
if (i == 0)
|
||||
/* 1st time: start in the middle */
|
||||
bit_idx = start_bit_idx;
|
||||
else
|
||||
/* 2nd time: mask bits done already */
|
||||
bit_idx &= (1UL << start_bit_idx) - 1;
|
||||
}
|
||||
|
||||
do {
|
||||
unsigned long bits;
|
||||
int port, irq;
|
||||
struct irq_desc *desc;
|
||||
|
||||
bits = MASK_LSBS(pending_bits, bit_idx);
|
||||
|
||||
/* If we masked out all events, move on. */
|
||||
if (bits == 0)
|
||||
break;
|
||||
|
||||
bit_idx = __ffs(bits);
|
||||
|
||||
/* Process port. */
|
||||
port = (word_idx * BITS_PER_LONG) + bit_idx;
|
||||
irq = evtchn_to_irq[port];
|
||||
|
||||
mask_evtchn(port);
|
||||
clear_evtchn(port);
|
||||
|
||||
|
@ -1113,7 +1189,21 @@ static void __xen_evtchn_do_upcall(void)
|
|||
if (desc)
|
||||
generic_handle_irq_desc(irq, desc);
|
||||
}
|
||||
}
|
||||
|
||||
bit_idx = (bit_idx + 1) % BITS_PER_LONG;
|
||||
|
||||
/* Next caller starts at last processed + 1 */
|
||||
__this_cpu_write(current_word_idx,
|
||||
bit_idx ? word_idx :
|
||||
(word_idx+1) % BITS_PER_LONG);
|
||||
__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_LONG;
|
||||
}
|
||||
|
||||
BUG_ON(!irqs_disabled());
|
||||
|
@ -1163,8 +1253,7 @@ void rebind_evtchn_irq(int evtchn, int irq)
|
|||
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);
|
||||
xen_irq_info_evtchn_init(irq, evtchn);
|
||||
|
||||
spin_unlock(&irq_mapping_update_lock);
|
||||
|
||||
|
@ -1181,10 +1270,14 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
|
|||
struct evtchn_bind_vcpu bind_vcpu;
|
||||
int evtchn = evtchn_from_irq(irq);
|
||||
|
||||
/* events delivered via platform PCI interrupts are always
|
||||
* routed to vcpu 0 */
|
||||
if (!VALID_EVTCHN(evtchn) ||
|
||||
(xen_hvm_domain() && !xen_have_vector_callback))
|
||||
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. */
|
||||
|
@ -1271,19 +1364,22 @@ static int retrigger_dynirq(struct irq_data *data)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static void restore_cpu_pirqs(void)
|
||||
static void restore_pirqs(void)
|
||||
{
|
||||
int pirq, rc, irq, gsi;
|
||||
struct physdev_map_pirq map_irq;
|
||||
struct irq_info *info;
|
||||
|
||||
for (pirq = 0; pirq < nr_irqs; pirq++) {
|
||||
irq = pirq_to_irq[pirq];
|
||||
if (irq == -1)
|
||||
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 */
|
||||
gsi = gsi_from_irq(irq);
|
||||
if (!gsi)
|
||||
continue;
|
||||
|
||||
|
@ -1296,8 +1392,7 @@ static void restore_cpu_pirqs(void)
|
|||
if (rc) {
|
||||
printk(KERN_WARNING "xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
|
||||
gsi, irq, pirq, rc);
|
||||
irq_info[irq] = mk_unbound_info();
|
||||
pirq_to_irq[pirq] = -1;
|
||||
xen_free_irq(irq);
|
||||
continue;
|
||||
}
|
||||
|
||||
|
@ -1327,8 +1422,7 @@ static void restore_cpu_virqs(unsigned int cpu)
|
|||
evtchn = bind_virq.port;
|
||||
|
||||
/* Record the new mapping. */
|
||||
evtchn_to_irq[evtchn] = irq;
|
||||
irq_info[irq] = mk_virq_info(evtchn, virq);
|
||||
xen_irq_info_virq_init(cpu, irq, evtchn, virq);
|
||||
bind_evtchn_to_cpu(evtchn, cpu);
|
||||
}
|
||||
}
|
||||
|
@ -1352,8 +1446,7 @@ static void restore_cpu_ipis(unsigned int cpu)
|
|||
evtchn = bind_ipi.port;
|
||||
|
||||
/* Record the new mapping. */
|
||||
evtchn_to_irq[evtchn] = irq;
|
||||
irq_info[irq] = mk_ipi_info(evtchn, ipi);
|
||||
xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
|
||||
bind_evtchn_to_cpu(evtchn, cpu);
|
||||
}
|
||||
}
|
||||
|
@ -1413,7 +1506,8 @@ void xen_poll_irq(int irq)
|
|||
|
||||
void xen_irq_resume(void)
|
||||
{
|
||||
unsigned int cpu, irq, evtchn;
|
||||
unsigned int cpu, evtchn;
|
||||
struct irq_info *info;
|
||||
|
||||
init_evtchn_cpu_bindings();
|
||||
|
||||
|
@ -1422,8 +1516,8 @@ void xen_irq_resume(void)
|
|||
mask_evtchn(evtchn);
|
||||
|
||||
/* No IRQ <-> event-channel mappings. */
|
||||
for (irq = 0; irq < nr_irqs; irq++)
|
||||
irq_info[irq].evtchn = 0; /* zap event-channel binding */
|
||||
list_for_each_entry(info, &xen_irq_list_head, list)
|
||||
info->evtchn = 0; /* zap event-channel binding */
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||||
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||||
for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
|
||||
evtchn_to_irq[evtchn] = -1;
|
||||
|
@ -1433,7 +1527,7 @@ void xen_irq_resume(void)
|
|||
restore_cpu_ipis(cpu);
|
||||
}
|
||||
|
||||
restore_cpu_pirqs();
|
||||
restore_pirqs();
|
||||
}
|
||||
|
||||
static struct irq_chip xen_dynamic_chip __read_mostly = {
|
||||
|
@ -1519,17 +1613,6 @@ void __init xen_init_IRQ(void)
|
|||
{
|
||||
int i;
|
||||
|
||||
cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s),
|
||||
GFP_KERNEL);
|
||||
irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL);
|
||||
|
||||
/* We are using nr_irqs as the maximum number of pirq available but
|
||||
* that number is actually chosen by Xen and we don't know exactly
|
||||
* what it is. Be careful choosing high pirq numbers. */
|
||||
pirq_to_irq = kcalloc(nr_irqs, sizeof(*pirq_to_irq), GFP_KERNEL);
|
||||
for (i = 0; i < nr_irqs; i++)
|
||||
pirq_to_irq[i] = -1;
|
||||
|
||||
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
|
||||
GFP_KERNEL);
|
||||
for (i = 0; i < NR_EVENT_CHANNELS; i++)
|
||||
|
|
|
@ -47,9 +47,9 @@ static inline void notify_remote_via_evtchn(int port)
|
|||
(void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
|
||||
}
|
||||
|
||||
extern void notify_remote_via_irq(int irq);
|
||||
void notify_remote_via_irq(int irq);
|
||||
|
||||
extern void xen_irq_resume(void);
|
||||
void xen_irq_resume(void);
|
||||
|
||||
/* Clear an irq's pending state, in preparation for polling on it */
|
||||
void xen_clear_irq_pending(int irq);
|
||||
|
@ -68,20 +68,22 @@ void xen_poll_irq_timeout(int irq, u64 timeout);
|
|||
unsigned irq_from_evtchn(unsigned int evtchn);
|
||||
|
||||
/* Xen HVM evtchn vector callback */
|
||||
extern void xen_hvm_callback_vector(void);
|
||||
void xen_hvm_callback_vector(void);
|
||||
extern int xen_have_vector_callback;
|
||||
int xen_set_callback_via(uint64_t via);
|
||||
void xen_evtchn_do_upcall(struct pt_regs *regs);
|
||||
void xen_hvm_evtchn_do_upcall(void);
|
||||
|
||||
/* Allocate an irq for a physical interrupt, given a gsi. "Legacy"
|
||||
* GSIs are identity mapped; others are dynamically allocated as
|
||||
* usual. */
|
||||
int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
|
||||
int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);
|
||||
/* Allocate a pirq for a physical interrupt, given a gsi. */
|
||||
int xen_allocate_pirq_gsi(unsigned gsi);
|
||||
/* Bind a pirq for a physical interrupt to an irq. */
|
||||
int xen_bind_pirq_gsi_to_irq(unsigned gsi,
|
||||
unsigned pirq, int shareable, char *name);
|
||||
|
||||
#ifdef CONFIG_PCI_MSI
|
||||
/* Allocate a pirq for a MSI style physical interrupt. */
|
||||
int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
|
||||
/* Bind an PSI pirq to an irq. */
|
||||
int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
|
||||
int pirq, int vector, const char *name);
|
||||
#endif
|
||||
|
@ -89,12 +91,6 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
|
|||
/* De-allocates the above mentioned physical interrupt. */
|
||||
int xen_destroy_irq(int irq);
|
||||
|
||||
/* Return vector allocated to pirq */
|
||||
int xen_vector_from_irq(unsigned pirq);
|
||||
|
||||
/* Return gsi allocated to pirq */
|
||||
int xen_gsi_from_irq(unsigned pirq);
|
||||
|
||||
/* Return irq from pirq */
|
||||
int xen_irq_from_pirq(unsigned pirq);
|
||||
|
||||
|
|
Loading…
Reference in a new issue