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![Joe Perches](/assets/img/avatar_default.png)
Convert printks to pr_<level> (excludes printk(KERN_DEBUG...) to be more consistent throughout the xen subsystem. Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME Coalesce formats and add missing word spaces Add missing newlines Align arguments and reflow to 80 columns Remove DRV_NAME from formats as pr_fmt adds the same content This does change some of the prefixes of these messages but it also does make them more consistent. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
1906 lines
44 KiB
C
1906 lines
44 KiB
C
/*
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* Xen event channels
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*
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* Xen models interrupts with abstract event channels. Because each
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* domain gets 1024 event channels, but NR_IRQ is not that large, we
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* must dynamically map irqs<->event channels. The event channels
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* interface with the rest of the kernel by defining a xen interrupt
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* chip. When an event is received, it is mapped to an irq and sent
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* through the normal interrupt processing path.
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*
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* There are four kinds of events which can be mapped to an event
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* channel:
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*
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* 1. Inter-domain notifications. This includes all the virtual
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* device events, since they're driven by front-ends in another domain
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* (typically dom0).
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* 2. VIRQs, typically used for timers. These are per-cpu events.
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* 3. IPIs.
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* 4. PIRQs - Hardware interrupts.
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*
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* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
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*/
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#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
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#include <linux/linkage.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <linux/irqnr.h>
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#include <linux/pci.h>
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#ifdef CONFIG_X86
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#include <asm/desc.h>
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#include <asm/ptrace.h>
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#include <asm/irq.h>
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#include <asm/idle.h>
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#include <asm/io_apic.h>
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#include <asm/xen/page.h>
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#include <asm/xen/pci.h>
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#endif
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#include <asm/sync_bitops.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/xen.h>
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#include <xen/hvm.h>
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#include <xen/xen-ops.h>
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#include <xen/events.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/event_channel.h>
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#include <xen/interface/hvm/hvm_op.h>
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#include <xen/interface/hvm/params.h>
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#include <xen/interface/physdev.h>
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#include <xen/interface/sched.h>
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#include <asm/hw_irq.h>
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/*
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* This lock protects updates to the following mapping and reference-count
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* arrays. The lock does not need to be acquired to read the mapping tables.
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*/
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static DEFINE_MUTEX(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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/* IRQ <-> IPI mapping */
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static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
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/* Interrupt types. */
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enum xen_irq_type {
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IRQT_UNBOUND = 0,
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IRQT_PIRQ,
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IRQT_VIRQ,
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IRQT_IPI,
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IRQT_EVTCHN
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};
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/*
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* Packed IRQ information:
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* type - enum xen_irq_type
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* event channel - irq->event channel mapping
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* cpu - cpu this event channel is bound to
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* index - type-specific information:
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* PIRQ - physical IRQ, GSI, flags, and owner domain
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* VIRQ - virq number
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* IPI - IPI vector
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* EVTCHN -
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*/
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struct irq_info {
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struct list_head list;
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int refcnt;
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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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union {
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unsigned short virq;
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enum ipi_vector ipi;
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struct {
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unsigned short pirq;
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unsigned short gsi;
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unsigned char flags;
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uint16_t domid;
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} pirq;
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} u;
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};
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#define PIRQ_NEEDS_EOI (1 << 0)
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#define PIRQ_SHAREABLE (1 << 1)
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static int *evtchn_to_irq;
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#ifdef CONFIG_X86
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static unsigned long *pirq_eoi_map;
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#endif
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static bool (*pirq_needs_eoi)(unsigned irq);
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/*
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* Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
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* careful to only use bitops which allow for this (e.g
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* test_bit/find_first_bit and friends but not __ffs) and to pass
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* BITS_PER_EVTCHN_WORD as the bitmask length.
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*/
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#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
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/*
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* Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
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* array. Primarily to avoid long lines (hence the terse name).
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*/
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#define BM(x) (unsigned long *)(x)
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/* Find the first set bit in a evtchn mask */
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#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
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static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
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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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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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static void enable_dynirq(struct irq_data *data);
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static void disable_dynirq(struct irq_data *data);
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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 irq_get_handler_data(irq);
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}
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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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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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irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
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}
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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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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 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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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 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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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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uint16_t domid,
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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.domid = domid;
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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 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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return 0;
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return info_for_irq(irq)->evtchn;
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}
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unsigned irq_from_evtchn(unsigned int evtchn)
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{
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return evtchn_to_irq[evtchn];
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}
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EXPORT_SYMBOL_GPL(irq_from_evtchn);
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static enum ipi_vector ipi_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_IPI);
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return info->u.ipi;
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}
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static unsigned virq_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_VIRQ);
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return info->u.virq;
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}
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static unsigned pirq_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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return info->u.pirq.pirq;
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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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}
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static unsigned cpu_from_irq(unsigned irq)
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{
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return info_for_irq(irq)->cpu;
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}
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static unsigned int cpu_from_evtchn(unsigned int evtchn)
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{
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int irq = evtchn_to_irq[evtchn];
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unsigned ret = 0;
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if (irq != -1)
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ret = cpu_from_irq(irq);
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return ret;
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}
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#ifdef CONFIG_X86
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static bool pirq_check_eoi_map(unsigned irq)
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{
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return test_bit(pirq_from_irq(irq), pirq_eoi_map);
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}
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#endif
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static bool pirq_needs_eoi_flag(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->type != IRQT_PIRQ);
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return info->u.pirq.flags & PIRQ_NEEDS_EOI;
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}
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static inline xen_ulong_t active_evtchns(unsigned int cpu,
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struct shared_info *sh,
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unsigned int idx)
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{
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return sh->evtchn_pending[idx] &
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per_cpu(cpu_evtchn_mask, cpu)[idx] &
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~sh->evtchn_mask[idx];
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}
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static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
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{
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int irq = evtchn_to_irq[chn];
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BUG_ON(irq == -1);
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#ifdef CONFIG_SMP
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cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
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#endif
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clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
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set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
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info_for_irq(irq)->cpu = cpu;
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}
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static void init_evtchn_cpu_bindings(void)
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{
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int i;
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#ifdef CONFIG_SMP
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struct irq_info *info;
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/* By default all event channels notify CPU#0. */
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list_for_each_entry(info, &xen_irq_list_head, list) {
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struct irq_desc *desc = irq_to_desc(info->irq);
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cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
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}
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#endif
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for_each_possible_cpu(i)
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memset(per_cpu(cpu_evtchn_mask, i),
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(i == 0) ? ~0 : 0, sizeof(*per_cpu(cpu_evtchn_mask, i)));
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}
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static inline void clear_evtchn(int port)
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{
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struct shared_info *s = HYPERVISOR_shared_info;
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sync_clear_bit(port, BM(&s->evtchn_pending[0]));
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}
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static inline void set_evtchn(int port)
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{
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struct shared_info *s = HYPERVISOR_shared_info;
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sync_set_bit(port, BM(&s->evtchn_pending[0]));
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}
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static inline int test_evtchn(int port)
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{
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struct shared_info *s = HYPERVISOR_shared_info;
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return sync_test_bit(port, BM(&s->evtchn_pending[0]));
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}
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/**
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* notify_remote_via_irq - send event to remote end of event channel via irq
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* @irq: irq of event channel to send event to
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*
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* Unlike notify_remote_via_evtchn(), this is safe to use across
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* save/restore. Notifications on a broken connection are silently
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* dropped.
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*/
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void notify_remote_via_irq(int irq)
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{
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int evtchn = evtchn_from_irq(irq);
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if (VALID_EVTCHN(evtchn))
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notify_remote_via_evtchn(evtchn);
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}
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EXPORT_SYMBOL_GPL(notify_remote_via_irq);
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static void mask_evtchn(int port)
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{
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struct shared_info *s = HYPERVISOR_shared_info;
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sync_set_bit(port, BM(&s->evtchn_mask[0]));
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}
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static void unmask_evtchn(int port)
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{
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struct shared_info *s = HYPERVISOR_shared_info;
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unsigned int cpu = get_cpu();
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int do_hypercall = 0, evtchn_pending = 0;
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BUG_ON(!irqs_disabled());
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if (unlikely((cpu != cpu_from_evtchn(port))))
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do_hypercall = 1;
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else {
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/*
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* Need to clear the mask before checking pending to
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* avoid a race with an event becoming pending.
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*
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* EVTCHNOP_unmask will only trigger an upcall if the
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* mask bit was set, so if a hypercall is needed
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* remask the event.
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*/
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sync_clear_bit(port, BM(&s->evtchn_mask[0]));
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evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
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if (unlikely(evtchn_pending && xen_hvm_domain())) {
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sync_set_bit(port, BM(&s->evtchn_mask[0]));
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do_hypercall = 1;
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}
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}
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/* Slow path (hypercall) if this is a non-local port or if this is
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* an hvm domain and an event is pending (hvm domains don't have
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* their own implementation of irq_enable). */
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if (do_hypercall) {
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struct evtchn_unmask unmask = { .port = port };
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(void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
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} else {
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struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
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/*
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* The following is basically the equivalent of
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* 'hw_resend_irq'. Just like a real IO-APIC we 'lose
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* the interrupt edge' if the channel is masked.
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*/
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if (evtchn_pending &&
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!sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
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BM(&vcpu_info->evtchn_pending_sel)))
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vcpu_info->evtchn_upcall_pending = 1;
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}
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put_cpu();
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}
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static void xen_irq_init(unsigned irq)
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{
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struct irq_info *info;
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#ifdef CONFIG_SMP
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struct irq_desc *desc = irq_to_desc(irq);
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/* By default all event channels notify CPU#0. */
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cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
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#endif
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (info == NULL)
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panic("Unable to allocate metadata for IRQ%d\n", irq);
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info->type = IRQT_UNBOUND;
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info->refcnt = -1;
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irq_set_handler_data(irq, info);
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list_add_tail(&info->list, &xen_irq_list_head);
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}
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static int __must_check xen_allocate_irq_dynamic(void)
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{
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int first = 0;
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int irq;
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#ifdef CONFIG_X86_IO_APIC
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/*
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* For an HVM guest or domain 0 which see "real" (emulated or
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* actual respectively) GSIs we allocate dynamic IRQs
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* e.g. those corresponding to event channels or MSIs
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* etc. from the range above those "real" GSIs to avoid
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* collisions.
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*/
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if (xen_initial_domain() || xen_hvm_domain())
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first = get_nr_irqs_gsi();
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#endif
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irq = irq_alloc_desc_from(first, -1);
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if (irq >= 0)
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xen_irq_init(irq);
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return irq;
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}
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static int __must_check xen_allocate_irq_gsi(unsigned gsi)
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{
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int irq;
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/*
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* 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 = 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 */
|
|
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 {
|
|
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);
|
|
|
|
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;
|
|
|
|
/*
|
|
* If this fails, it usually just indicates that we're dealing with a
|
|
* virq or IPI channel, which don't actually need to be rebound. Ignore
|
|
* it, but don't do the xenlinux-level rebind in that case.
|
|
*/
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0)
|
|
bind_evtchn_to_cpu(evtchn, tcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
|
|
bool force)
|
|
{
|
|
unsigned tcpu = cpumask_first(dest);
|
|
|
|
return rebind_irq_to_cpu(data->irq, tcpu);
|
|
}
|
|
|
|
int resend_irq_on_evtchn(unsigned int irq)
|
|
{
|
|
int masked, evtchn = evtchn_from_irq(irq);
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return 1;
|
|
|
|
masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
|
|
sync_set_bit(evtchn, BM(s->evtchn_pending));
|
|
if (!masked)
|
|
unmask_evtchn(evtchn);
|
|
|
|
return 1;
|
|
}
|
|
|
|
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)
|
|
{
|
|
int evtchn = evtchn_from_irq(data->irq);
|
|
struct shared_info *sh = HYPERVISOR_shared_info;
|
|
int ret = 0;
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
int masked;
|
|
|
|
masked = sync_test_and_set_bit(evtchn, BM(sh->evtchn_mask));
|
|
sync_set_bit(evtchn, BM(sh->evtchn_pending));
|
|
if (!masked)
|
|
unmask_evtchn(evtchn);
|
|
ret = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
init_evtchn_cpu_bindings();
|
|
|
|
/* New event-channel space is not 'live' yet. */
|
|
for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
|
|
mask_evtchn(evtchn);
|
|
|
|
/* No IRQ <-> event-channel mappings. */
|
|
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;
|
|
|
|
init_evtchn_cpu_bindings();
|
|
|
|
/* 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
|
|
}
|