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![Boris Ostrovsky](/assets/img/avatar_default.png)
After commit 8c058b0b9c
("x86/irq: Probe for PIC presence before
allocating descs for legacy IRQs") early_irq_init() will no longer
preallocate descriptors for legacy interrupts if PIC does not
exist, which is the case for Xen PV guests.
Therefore we may need to allocate those descriptors ourselves.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
1702 lines
37 KiB
C
1702 lines
37 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/i8259.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/page.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 <xen/interface/vcpu.h>
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#include <asm/hw_irq.h>
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#include "events_internal.h"
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const struct evtchn_ops *evtchn_ops;
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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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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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#define EVTCHN_ROW(e) (e / (PAGE_SIZE/sizeof(**evtchn_to_irq)))
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#define EVTCHN_COL(e) (e % (PAGE_SIZE/sizeof(**evtchn_to_irq)))
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#define EVTCHN_PER_ROW (PAGE_SIZE / sizeof(**evtchn_to_irq))
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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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static void clear_evtchn_to_irq_row(unsigned row)
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{
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unsigned col;
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for (col = 0; col < EVTCHN_PER_ROW; col++)
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evtchn_to_irq[row][col] = -1;
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}
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static void clear_evtchn_to_irq_all(void)
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{
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unsigned row;
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for (row = 0; row < EVTCHN_ROW(xen_evtchn_max_channels()); row++) {
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if (evtchn_to_irq[row] == NULL)
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continue;
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clear_evtchn_to_irq_row(row);
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}
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}
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static int set_evtchn_to_irq(unsigned evtchn, unsigned irq)
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{
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unsigned row;
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unsigned col;
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if (evtchn >= xen_evtchn_max_channels())
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return -EINVAL;
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row = EVTCHN_ROW(evtchn);
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col = EVTCHN_COL(evtchn);
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if (evtchn_to_irq[row] == NULL) {
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/* Unallocated irq entries return -1 anyway */
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if (irq == -1)
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return 0;
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evtchn_to_irq[row] = (int *)get_zeroed_page(GFP_KERNEL);
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if (evtchn_to_irq[row] == NULL)
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return -ENOMEM;
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clear_evtchn_to_irq_row(row);
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}
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evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)] = irq;
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return 0;
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}
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int get_evtchn_to_irq(unsigned evtchn)
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{
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if (evtchn >= xen_evtchn_max_channels())
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return -1;
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if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL)
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return -1;
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return evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)];
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}
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/* Get info for IRQ */
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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 int xen_irq_info_common_setup(struct irq_info *info,
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unsigned irq,
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enum xen_irq_type type,
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unsigned evtchn,
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unsigned short cpu)
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{
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int ret;
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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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ret = set_evtchn_to_irq(evtchn, irq);
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if (ret < 0)
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return ret;
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irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
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return xen_evtchn_port_setup(info);
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}
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static int xen_irq_info_evtchn_setup(unsigned irq,
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unsigned evtchn)
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{
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struct irq_info *info = info_for_irq(irq);
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return xen_irq_info_common_setup(info, irq, IRQT_EVTCHN, evtchn, 0);
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}
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static int xen_irq_info_ipi_setup(unsigned cpu,
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unsigned irq,
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unsigned 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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info->u.ipi = ipi;
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per_cpu(ipi_to_irq, cpu)[ipi] = irq;
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return xen_irq_info_common_setup(info, irq, IRQT_IPI, evtchn, 0);
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}
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static int xen_irq_info_virq_setup(unsigned cpu,
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unsigned irq,
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unsigned evtchn,
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unsigned virq)
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{
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struct irq_info *info = info_for_irq(irq);
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info->u.virq = virq;
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per_cpu(virq_to_irq, cpu)[virq] = irq;
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return xen_irq_info_common_setup(info, irq, IRQT_VIRQ, evtchn, 0);
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}
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static int xen_irq_info_pirq_setup(unsigned irq,
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unsigned evtchn,
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unsigned pirq,
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unsigned 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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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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return xen_irq_info_common_setup(info, irq, IRQT_PIRQ, evtchn, 0);
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}
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static void xen_irq_info_cleanup(struct irq_info *info)
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{
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set_evtchn_to_irq(info->evtchn, -1);
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info->evtchn = 0;
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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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unsigned int evtchn_from_irq(unsigned irq)
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{
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if (unlikely(WARN(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 get_evtchn_to_irq(evtchn);
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}
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EXPORT_SYMBOL_GPL(irq_from_evtchn);
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int irq_from_virq(unsigned int cpu, unsigned int virq)
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{
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return per_cpu(virq_to_irq, cpu)[virq];
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}
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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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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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unsigned int cpu_from_evtchn(unsigned int evtchn)
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{
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int irq = get_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 void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
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{
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int irq = get_evtchn_to_irq(chn);
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struct irq_info *info = info_for_irq(irq);
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BUG_ON(irq == -1);
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#ifdef CONFIG_SMP
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cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(cpu));
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#endif
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xen_evtchn_port_bind_to_cpu(info, cpu);
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info->cpu = cpu;
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}
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static void xen_evtchn_mask_all(void)
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{
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unsigned int evtchn;
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for (evtchn = 0; evtchn < xen_evtchn_nr_channels(); evtchn++)
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mask_evtchn(evtchn);
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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 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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/* By default all event channels notify CPU#0. */
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cpumask_copy(irq_get_affinity_mask(irq), 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_irqs_dynamic(int nvec)
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{
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int i, irq = irq_alloc_descs(-1, 0, nvec, -1);
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if (irq >= 0) {
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for (i = 0; i < nvec; i++)
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xen_irq_init(irq + i);
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}
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return irq;
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}
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static inline int __must_check xen_allocate_irq_dynamic(void)
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{
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return xen_allocate_irqs_dynamic(1);
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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
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* nor access to/knowledge of the physical APICs). Therefore
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* all IRQs are dynamically allocated from the entire IRQ
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* space.
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*/
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if (xen_pv_domain() && !xen_initial_domain())
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return xen_allocate_irq_dynamic();
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/* Legacy IRQ descriptors are already allocated by the arch. */
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if (gsi < nr_legacy_irqs())
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irq = gsi;
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else
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irq = irq_alloc_desc_at(gsi, -1);
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xen_irq_init(irq);
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return irq;
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}
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static void xen_free_irq(unsigned irq)
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{
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struct irq_info *info = irq_get_handler_data(irq);
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if (WARN_ON(!info))
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return;
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list_del(&info->list);
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irq_set_handler_data(irq, NULL);
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WARN_ON(info->refcnt > 0);
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kfree(info);
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/* Legacy IRQ descriptors are managed by the arch. */
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if (irq < nr_legacy_irqs())
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return;
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irq_free_desc(irq);
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}
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static void xen_evtchn_close(unsigned int port)
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{
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struct evtchn_close close;
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close.port = port;
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if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
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BUG();
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}
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static void pirq_query_unmask(int irq)
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{
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struct physdev_irq_status_query irq_status;
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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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irq_status.irq = pirq_from_irq(irq);
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if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
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irq_status.flags = 0;
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info->u.pirq.flags &= ~PIRQ_NEEDS_EOI;
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if (irq_status.flags & XENIRQSTAT_needs_eoi)
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info->u.pirq.flags |= PIRQ_NEEDS_EOI;
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}
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static void eoi_pirq(struct irq_data *data)
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{
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int evtchn = evtchn_from_irq(data->irq);
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struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
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int rc = 0;
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irq_move_irq(data);
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if (VALID_EVTCHN(evtchn))
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clear_evtchn(evtchn);
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if (pirq_needs_eoi(data->irq)) {
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rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
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WARN_ON(rc);
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}
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}
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static void mask_ack_pirq(struct irq_data *data)
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{
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disable_dynirq(data);
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eoi_pirq(data);
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}
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static unsigned int __startup_pirq(unsigned int irq)
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{
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struct evtchn_bind_pirq bind_pirq;
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struct irq_info *info = info_for_irq(irq);
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int evtchn = evtchn_from_irq(irq);
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int rc;
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BUG_ON(info->type != IRQT_PIRQ);
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|
|
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) {
|
|
pr_warn("Failed to obtain physical IRQ %d\n", irq);
|
|
return 0;
|
|
}
|
|
evtchn = bind_pirq.port;
|
|
|
|
pirq_query_unmask(irq);
|
|
|
|
rc = set_evtchn_to_irq(evtchn, irq);
|
|
if (rc)
|
|
goto err;
|
|
|
|
info->evtchn = evtchn;
|
|
bind_evtchn_to_cpu(evtchn, 0);
|
|
|
|
rc = xen_evtchn_port_setup(info);
|
|
if (rc)
|
|
goto err;
|
|
|
|
out:
|
|
unmask_evtchn(evtchn);
|
|
eoi_pirq(irq_get_irq_data(irq));
|
|
|
|
return 0;
|
|
|
|
err:
|
|
pr_err("irq%d: Failed to set port to irq mapping (%d)\n", irq, rc);
|
|
xen_evtchn_close(evtchn);
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int startup_pirq(struct irq_data *data)
|
|
{
|
|
return __startup_pirq(data->irq);
|
|
}
|
|
|
|
static void shutdown_pirq(struct irq_data *data)
|
|
{
|
|
unsigned int irq = data->irq;
|
|
struct irq_info *info = info_for_irq(irq);
|
|
unsigned evtchn = evtchn_from_irq(irq);
|
|
|
|
BUG_ON(info->type != IRQT_PIRQ);
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return;
|
|
|
|
mask_evtchn(evtchn);
|
|
xen_evtchn_close(evtchn);
|
|
xen_irq_info_cleanup(info);
|
|
}
|
|
|
|
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);
|
|
|
|
static void __unbind_from_irq(unsigned int irq)
|
|
{
|
|
int evtchn = evtchn_from_irq(irq);
|
|
struct irq_info *info = irq_get_handler_data(irq);
|
|
|
|
if (info->refcnt > 0) {
|
|
info->refcnt--;
|
|
if (info->refcnt != 0)
|
|
return;
|
|
}
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
unsigned int cpu = cpu_from_irq(irq);
|
|
|
|
xen_evtchn_close(evtchn);
|
|
|
|
switch (type_from_irq(irq)) {
|
|
case IRQT_VIRQ:
|
|
per_cpu(virq_to_irq, cpu)[virq_from_irq(irq)] = -1;
|
|
break;
|
|
case IRQT_IPI:
|
|
per_cpu(ipi_to_irq, cpu)[ipi_from_irq(irq)] = -1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
xen_irq_info_cleanup(info);
|
|
}
|
|
|
|
BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
|
|
|
|
xen_free_irq(irq);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int ret;
|
|
|
|
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;
|
|
}
|
|
|
|
ret = xen_irq_info_pirq_setup(irq, 0, pirq, gsi, DOMID_SELF,
|
|
shareable ? PIRQ_SHAREABLE : 0);
|
|
if (ret < 0) {
|
|
__unbind_from_irq(irq);
|
|
irq = ret;
|
|
goto out;
|
|
}
|
|
|
|
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, int nvec, const char *name, domid_t domid)
|
|
{
|
|
int i, irq, ret;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = xen_allocate_irqs_dynamic(nvec);
|
|
if (irq < 0)
|
|
goto out;
|
|
|
|
for (i = 0; i < nvec; i++) {
|
|
irq_set_chip_and_handler_name(irq + i, &xen_pirq_chip, handle_edge_irq, name);
|
|
|
|
ret = xen_irq_info_pirq_setup(irq + i, 0, pirq + i, 0, domid,
|
|
i == 0 ? 0 : PIRQ_MSI_GROUP);
|
|
if (ret < 0)
|
|
goto error_irq;
|
|
}
|
|
|
|
ret = irq_set_msi_desc(irq, msidesc);
|
|
if (ret < 0)
|
|
goto error_irq;
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
return irq;
|
|
error_irq:
|
|
for (; i >= 0; i--)
|
|
__unbind_from_irq(irq + i);
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
int xen_destroy_irq(int irq)
|
|
{
|
|
struct physdev_unmap_pirq unmap_irq;
|
|
struct irq_info *info = info_for_irq(irq);
|
|
int rc = -ENOENT;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
/*
|
|
* If trying to remove a vector in a MSI group different
|
|
* than the first one skip the PIRQ unmap unless this vector
|
|
* is the first one in the group.
|
|
*/
|
|
if (xen_initial_domain() && !(info->u.pirq.flags & PIRQ_MSI_GROUP)) {
|
|
unmap_irq.pirq = info->u.pirq.pirq;
|
|
unmap_irq.domid = info->u.pirq.domid;
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
|
|
/* 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;
|
|
int ret;
|
|
|
|
if (evtchn >= xen_evtchn_max_channels())
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = get_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");
|
|
|
|
ret = xen_irq_info_evtchn_setup(irq, evtchn);
|
|
if (ret < 0) {
|
|
__unbind_from_irq(irq);
|
|
irq = ret;
|
|
goto out;
|
|
}
|
|
/* New interdomain events are bound to VCPU 0. */
|
|
bind_evtchn_to_cpu(evtchn, 0);
|
|
} 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;
|
|
int ret;
|
|
|
|
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;
|
|
|
|
ret = xen_irq_info_ipi_setup(cpu, irq, evtchn, ipi);
|
|
if (ret < 0) {
|
|
__unbind_from_irq(irq);
|
|
irq = ret;
|
|
goto out;
|
|
}
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq);
|
|
|
|
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 < xen_evtchn_max_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;
|
|
}
|
|
|
|
/**
|
|
* xen_evtchn_nr_channels - number of usable event channel ports
|
|
*
|
|
* This may be less than the maximum supported by the current
|
|
* hypervisor ABI. Use xen_evtchn_max_channels() for the maximum
|
|
* supported.
|
|
*/
|
|
unsigned xen_evtchn_nr_channels(void)
|
|
{
|
|
return evtchn_ops->nr_channels();
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_evtchn_nr_channels);
|
|
|
|
int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu)
|
|
{
|
|
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;
|
|
|
|
if (percpu)
|
|
irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
|
|
handle_percpu_irq, "virq");
|
|
else
|
|
irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
|
|
handle_edge_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;
|
|
}
|
|
|
|
ret = xen_irq_info_virq_setup(cpu, irq, evtchn, virq);
|
|
if (ret < 0) {
|
|
__unbind_from_irq(irq);
|
|
irq = ret;
|
|
goto out;
|
|
}
|
|
|
|
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)
|
|
{
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
__unbind_from_irq(irq);
|
|
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, irqflags & IRQF_PERCPU);
|
|
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);
|
|
|
|
/**
|
|
* xen_set_irq_priority() - set an event channel priority.
|
|
* @irq:irq bound to an event channel.
|
|
* @priority: priority between XEN_IRQ_PRIORITY_MAX and XEN_IRQ_PRIORITY_MIN.
|
|
*/
|
|
int xen_set_irq_priority(unsigned irq, unsigned priority)
|
|
{
|
|
struct evtchn_set_priority set_priority;
|
|
|
|
set_priority.port = evtchn_from_irq(irq);
|
|
set_priority.priority = priority;
|
|
|
|
return HYPERVISOR_event_channel_op(EVTCHNOP_set_priority,
|
|
&set_priority);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_set_irq_priority);
|
|
|
|
int evtchn_make_refcounted(unsigned int evtchn)
|
|
{
|
|
int irq = get_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 >= xen_evtchn_max_channels())
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = get_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 = get_evtchn_to_irq(evtchn);
|
|
if (WARN_ON(irq == -1))
|
|
return;
|
|
unbind_from_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(evtchn_put);
|
|
|
|
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
|
|
{
|
|
int irq;
|
|
|
|
#ifdef CONFIG_X86
|
|
if (unlikely(vector == XEN_NMI_VECTOR)) {
|
|
int rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi, cpu, NULL);
|
|
if (rc < 0)
|
|
printk(KERN_WARNING "Sending nmi to CPU%d failed (rc:%d)\n", cpu, rc);
|
|
return;
|
|
}
|
|
#endif
|
|
irq = per_cpu(ipi_to_irq, cpu)[vector];
|
|
BUG_ON(irq < 0);
|
|
notify_remote_via_irq(irq);
|
|
}
|
|
|
|
static DEFINE_PER_CPU(unsigned, xed_nesting_count);
|
|
|
|
static void __xen_evtchn_do_upcall(void)
|
|
{
|
|
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
|
|
int cpu = get_cpu();
|
|
unsigned count;
|
|
|
|
do {
|
|
vcpu_info->evtchn_upcall_pending = 0;
|
|
|
|
if (__this_cpu_inc_return(xed_nesting_count) - 1)
|
|
goto out;
|
|
|
|
xen_evtchn_handle_events(cpu);
|
|
|
|
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();
|
|
inc_irq_stat(irq_hv_callback_count);
|
|
#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(get_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);
|
|
|
|
(void)xen_irq_info_evtchn_setup(irq, evtchn);
|
|
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
bind_evtchn_to_cpu(evtchn, info->cpu);
|
|
/* This will be deferred until interrupt is processed */
|
|
irq_set_affinity(irq, cpumask_of(info->cpu));
|
|
|
|
/* Unmask the event channel. */
|
|
enable_irq(irq);
|
|
}
|
|
|
|
/* Rebind an evtchn so that it gets delivered to a specific cpu */
|
|
static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
|
|
{
|
|
struct evtchn_bind_vcpu bind_vcpu;
|
|
int evtchn = evtchn_from_irq(irq);
|
|
int masked;
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return -1;
|
|
|
|
if (!xen_support_evtchn_rebind())
|
|
return -1;
|
|
|
|
/* Send future instances of this interrupt to other vcpu. */
|
|
bind_vcpu.port = evtchn;
|
|
bind_vcpu.vcpu = tcpu;
|
|
|
|
/*
|
|
* Mask the event while changing the VCPU binding to prevent
|
|
* it being delivered on an unexpected VCPU.
|
|
*/
|
|
masked = test_and_set_mask(evtchn);
|
|
|
|
/*
|
|
* If this fails, it usually just indicates that we're dealing with a
|
|
* virq or IPI channel, which don't actually need to be rebound. Ignore
|
|
* it, but don't do the xenlinux-level rebind in that case.
|
|
*/
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0)
|
|
bind_evtchn_to_cpu(evtchn, tcpu);
|
|
|
|
if (!masked)
|
|
unmask_evtchn(evtchn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
|
|
bool force)
|
|
{
|
|
unsigned tcpu = cpumask_first_and(dest, cpu_online_mask);
|
|
|
|
return rebind_irq_to_cpu(data->irq, tcpu);
|
|
}
|
|
|
|
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)
|
|
{
|
|
unsigned int evtchn = evtchn_from_irq(data->irq);
|
|
int masked;
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return 0;
|
|
|
|
masked = test_and_set_mask(evtchn);
|
|
set_evtchn(evtchn);
|
|
if (!masked)
|
|
unmask_evtchn(evtchn);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void restore_pirqs(void)
|
|
{
|
|
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. */
|
|
(void)xen_irq_info_virq_setup(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. */
|
|
(void)xen_irq_info_ipi_setup(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;
|
|
struct irq_info *info;
|
|
|
|
/* New event-channel space is not 'live' yet. */
|
|
xen_evtchn_mask_all();
|
|
xen_evtchn_resume();
|
|
|
|
/* No IRQ <-> event-channel mappings. */
|
|
list_for_each_entry(info, &xen_irq_list_head, list)
|
|
info->evtchn = 0; /* zap event-channel binding */
|
|
|
|
clear_evtchn_to_irq_all();
|
|
|
|
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
|
|
|
|
#undef MODULE_PARAM_PREFIX
|
|
#define MODULE_PARAM_PREFIX "xen."
|
|
|
|
static bool fifo_events = true;
|
|
module_param(fifo_events, bool, 0);
|
|
|
|
void __init xen_init_IRQ(void)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (fifo_events)
|
|
ret = xen_evtchn_fifo_init();
|
|
if (ret < 0)
|
|
xen_evtchn_2l_init();
|
|
|
|
evtchn_to_irq = kcalloc(EVTCHN_ROW(xen_evtchn_max_channels()),
|
|
sizeof(*evtchn_to_irq), GFP_KERNEL);
|
|
BUG_ON(!evtchn_to_irq);
|
|
|
|
/* No event channels are 'live' right now. */
|
|
xen_evtchn_mask_all();
|
|
|
|
pirq_needs_eoi = pirq_needs_eoi_flag;
|
|
|
|
#ifdef CONFIG_X86
|
|
if (xen_pv_domain()) {
|
|
irq_ctx_init(smp_processor_id());
|
|
if (xen_initial_domain())
|
|
pci_xen_initial_domain();
|
|
}
|
|
if (xen_feature(XENFEAT_hvm_callback_vector))
|
|
xen_callback_vector();
|
|
|
|
if (xen_hvm_domain()) {
|
|
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;
|
|
|
|
pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
|
|
eoi_gmfn.gmfn = virt_to_gfn(pirq_eoi_map);
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
|
|
/* TODO: No PVH support for PIRQ EOI */
|
|
if (rc != 0) {
|
|
free_page((unsigned long) pirq_eoi_map);
|
|
pirq_eoi_map = NULL;
|
|
} else
|
|
pirq_needs_eoi = pirq_check_eoi_map;
|
|
}
|
|
#endif
|
|
}
|