2299 lines
52 KiB
C
2299 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Xen event channels
|
|
*
|
|
* Xen models interrupts with abstract event channels. Because each
|
|
* domain gets 1024 event channels, but NR_IRQ is not that large, we
|
|
* must dynamically map irqs<->event channels. The event channels
|
|
* interface with the rest of the kernel by defining a xen interrupt
|
|
* chip. When an event is received, it is mapped to an irq and sent
|
|
* through the normal interrupt processing path.
|
|
*
|
|
* There are four kinds of events which can be mapped to an event
|
|
* channel:
|
|
*
|
|
* 1. Inter-domain notifications. This includes all the virtual
|
|
* device events, since they're driven by front-ends in another domain
|
|
* (typically dom0).
|
|
* 2. VIRQs, typically used for timers. These are per-cpu events.
|
|
* 3. IPIs.
|
|
* 4. PIRQs - Hardware interrupts.
|
|
*
|
|
* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/string.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/irqnr.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/cpuhotplug.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/ktime.h>
|
|
|
|
#ifdef CONFIG_X86
|
|
#include <asm/desc.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/idtentry.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/io_apic.h>
|
|
#include <asm/i8259.h>
|
|
#include <asm/xen/pci.h>
|
|
#endif
|
|
#include <asm/sync_bitops.h>
|
|
#include <asm/xen/hypercall.h>
|
|
#include <asm/xen/hypervisor.h>
|
|
#include <xen/page.h>
|
|
|
|
#include <xen/xen.h>
|
|
#include <xen/hvm.h>
|
|
#include <xen/xen-ops.h>
|
|
#include <xen/events.h>
|
|
#include <xen/interface/xen.h>
|
|
#include <xen/interface/event_channel.h>
|
|
#include <xen/interface/hvm/hvm_op.h>
|
|
#include <xen/interface/hvm/params.h>
|
|
#include <xen/interface/physdev.h>
|
|
#include <xen/interface/sched.h>
|
|
#include <xen/interface/vcpu.h>
|
|
#include <xen/xenbus.h>
|
|
#include <asm/hw_irq.h>
|
|
|
|
#include "events_internal.h"
|
|
|
|
#undef MODULE_PARAM_PREFIX
|
|
#define MODULE_PARAM_PREFIX "xen."
|
|
|
|
/* Interrupt types. */
|
|
enum xen_irq_type {
|
|
IRQT_UNBOUND = 0,
|
|
IRQT_PIRQ,
|
|
IRQT_VIRQ,
|
|
IRQT_IPI,
|
|
IRQT_EVTCHN
|
|
};
|
|
|
|
/*
|
|
* Packed IRQ information:
|
|
* type - enum xen_irq_type
|
|
* event channel - irq->event channel mapping
|
|
* cpu - cpu this event channel is bound to
|
|
* index - type-specific information:
|
|
* PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
|
|
* guest, or GSI (real passthrough IRQ) of the device.
|
|
* VIRQ - virq number
|
|
* IPI - IPI vector
|
|
* EVTCHN -
|
|
*/
|
|
struct irq_info {
|
|
struct list_head list;
|
|
struct list_head eoi_list;
|
|
short refcnt;
|
|
u8 spurious_cnt;
|
|
u8 is_accounted;
|
|
short type; /* type: IRQT_* */
|
|
u8 mask_reason; /* Why is event channel masked */
|
|
#define EVT_MASK_REASON_EXPLICIT 0x01
|
|
#define EVT_MASK_REASON_TEMPORARY 0x02
|
|
#define EVT_MASK_REASON_EOI_PENDING 0x04
|
|
u8 is_active; /* Is event just being handled? */
|
|
unsigned irq;
|
|
evtchn_port_t evtchn; /* event channel */
|
|
unsigned short cpu; /* cpu bound */
|
|
unsigned short eoi_cpu; /* EOI must happen on this cpu-1 */
|
|
unsigned int irq_epoch; /* If eoi_cpu valid: irq_epoch of event */
|
|
u64 eoi_time; /* Time in jiffies when to EOI. */
|
|
raw_spinlock_t lock;
|
|
|
|
union {
|
|
unsigned short virq;
|
|
enum ipi_vector ipi;
|
|
struct {
|
|
unsigned short pirq;
|
|
unsigned short gsi;
|
|
unsigned char vector;
|
|
unsigned char flags;
|
|
uint16_t domid;
|
|
} pirq;
|
|
struct xenbus_device *interdomain;
|
|
} u;
|
|
};
|
|
|
|
#define PIRQ_NEEDS_EOI (1 << 0)
|
|
#define PIRQ_SHAREABLE (1 << 1)
|
|
#define PIRQ_MSI_GROUP (1 << 2)
|
|
|
|
static uint __read_mostly event_loop_timeout = 2;
|
|
module_param(event_loop_timeout, uint, 0644);
|
|
|
|
static uint __read_mostly event_eoi_delay = 10;
|
|
module_param(event_eoi_delay, uint, 0644);
|
|
|
|
const struct evtchn_ops *evtchn_ops;
|
|
|
|
/*
|
|
* This lock protects updates to the following mapping and reference-count
|
|
* arrays. The lock does not need to be acquired to read the mapping tables.
|
|
*/
|
|
static DEFINE_MUTEX(irq_mapping_update_lock);
|
|
|
|
/*
|
|
* Lock protecting event handling loop against removing event channels.
|
|
* Adding of event channels is no issue as the associated IRQ becomes active
|
|
* only after everything is setup (before request_[threaded_]irq() the handler
|
|
* can't be entered for an event, as the event channel will be unmasked only
|
|
* then).
|
|
*/
|
|
static DEFINE_RWLOCK(evtchn_rwlock);
|
|
|
|
/*
|
|
* Lock hierarchy:
|
|
*
|
|
* irq_mapping_update_lock
|
|
* evtchn_rwlock
|
|
* IRQ-desc lock
|
|
* percpu eoi_list_lock
|
|
* irq_info->lock
|
|
*/
|
|
|
|
static LIST_HEAD(xen_irq_list_head);
|
|
|
|
/* IRQ <-> VIRQ mapping. */
|
|
static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
|
|
|
|
/* IRQ <-> IPI mapping */
|
|
static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
|
|
|
|
/* Event channel distribution data */
|
|
static atomic_t channels_on_cpu[NR_CPUS];
|
|
|
|
static int **evtchn_to_irq;
|
|
#ifdef CONFIG_X86
|
|
static unsigned long *pirq_eoi_map;
|
|
#endif
|
|
static bool (*pirq_needs_eoi)(unsigned irq);
|
|
|
|
#define EVTCHN_ROW(e) (e / (PAGE_SIZE/sizeof(**evtchn_to_irq)))
|
|
#define EVTCHN_COL(e) (e % (PAGE_SIZE/sizeof(**evtchn_to_irq)))
|
|
#define EVTCHN_PER_ROW (PAGE_SIZE / sizeof(**evtchn_to_irq))
|
|
|
|
/* Xen will never allocate port zero for any purpose. */
|
|
#define VALID_EVTCHN(chn) ((chn) != 0)
|
|
|
|
static struct irq_info *legacy_info_ptrs[NR_IRQS_LEGACY];
|
|
|
|
static struct irq_chip xen_dynamic_chip;
|
|
static struct irq_chip xen_lateeoi_chip;
|
|
static struct irq_chip xen_percpu_chip;
|
|
static struct irq_chip xen_pirq_chip;
|
|
static void enable_dynirq(struct irq_data *data);
|
|
static void disable_dynirq(struct irq_data *data);
|
|
|
|
static DEFINE_PER_CPU(unsigned int, irq_epoch);
|
|
|
|
static void clear_evtchn_to_irq_row(int *evtchn_row)
|
|
{
|
|
unsigned col;
|
|
|
|
for (col = 0; col < EVTCHN_PER_ROW; col++)
|
|
WRITE_ONCE(evtchn_row[col], -1);
|
|
}
|
|
|
|
static void clear_evtchn_to_irq_all(void)
|
|
{
|
|
unsigned row;
|
|
|
|
for (row = 0; row < EVTCHN_ROW(xen_evtchn_max_channels()); row++) {
|
|
if (evtchn_to_irq[row] == NULL)
|
|
continue;
|
|
clear_evtchn_to_irq_row(evtchn_to_irq[row]);
|
|
}
|
|
}
|
|
|
|
static int set_evtchn_to_irq(evtchn_port_t evtchn, unsigned int irq)
|
|
{
|
|
unsigned row;
|
|
unsigned col;
|
|
int *evtchn_row;
|
|
|
|
if (evtchn >= xen_evtchn_max_channels())
|
|
return -EINVAL;
|
|
|
|
row = EVTCHN_ROW(evtchn);
|
|
col = EVTCHN_COL(evtchn);
|
|
|
|
if (evtchn_to_irq[row] == NULL) {
|
|
/* Unallocated irq entries return -1 anyway */
|
|
if (irq == -1)
|
|
return 0;
|
|
|
|
evtchn_row = (int *) __get_free_pages(GFP_KERNEL, 0);
|
|
if (evtchn_row == NULL)
|
|
return -ENOMEM;
|
|
|
|
clear_evtchn_to_irq_row(evtchn_row);
|
|
|
|
/*
|
|
* We've prepared an empty row for the mapping. If a different
|
|
* thread was faster inserting it, we can drop ours.
|
|
*/
|
|
if (cmpxchg(&evtchn_to_irq[row], NULL, evtchn_row) != NULL)
|
|
free_page((unsigned long) evtchn_row);
|
|
}
|
|
|
|
WRITE_ONCE(evtchn_to_irq[row][col], irq);
|
|
return 0;
|
|
}
|
|
|
|
int get_evtchn_to_irq(evtchn_port_t evtchn)
|
|
{
|
|
if (evtchn >= xen_evtchn_max_channels())
|
|
return -1;
|
|
if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL)
|
|
return -1;
|
|
return READ_ONCE(evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)]);
|
|
}
|
|
|
|
/* Get info for IRQ */
|
|
static struct irq_info *info_for_irq(unsigned irq)
|
|
{
|
|
if (irq < nr_legacy_irqs())
|
|
return legacy_info_ptrs[irq];
|
|
else
|
|
return irq_get_chip_data(irq);
|
|
}
|
|
|
|
static void set_info_for_irq(unsigned int irq, struct irq_info *info)
|
|
{
|
|
if (irq < nr_legacy_irqs())
|
|
legacy_info_ptrs[irq] = info;
|
|
else
|
|
irq_set_chip_data(irq, info);
|
|
}
|
|
|
|
/* Per CPU channel accounting */
|
|
static void channels_on_cpu_dec(struct irq_info *info)
|
|
{
|
|
if (!info->is_accounted)
|
|
return;
|
|
|
|
info->is_accounted = 0;
|
|
|
|
if (WARN_ON_ONCE(info->cpu >= nr_cpu_ids))
|
|
return;
|
|
|
|
WARN_ON_ONCE(!atomic_add_unless(&channels_on_cpu[info->cpu], -1 , 0));
|
|
}
|
|
|
|
static void channels_on_cpu_inc(struct irq_info *info)
|
|
{
|
|
if (WARN_ON_ONCE(info->cpu >= nr_cpu_ids))
|
|
return;
|
|
|
|
if (WARN_ON_ONCE(!atomic_add_unless(&channels_on_cpu[info->cpu], 1,
|
|
INT_MAX)))
|
|
return;
|
|
|
|
info->is_accounted = 1;
|
|
}
|
|
|
|
/* Constructors for packed IRQ information. */
|
|
static int xen_irq_info_common_setup(struct irq_info *info,
|
|
unsigned irq,
|
|
enum xen_irq_type type,
|
|
evtchn_port_t evtchn,
|
|
unsigned short cpu)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
|
|
|
|
info->type = type;
|
|
info->irq = irq;
|
|
info->evtchn = evtchn;
|
|
info->cpu = cpu;
|
|
info->mask_reason = EVT_MASK_REASON_EXPLICIT;
|
|
raw_spin_lock_init(&info->lock);
|
|
|
|
ret = set_evtchn_to_irq(evtchn, irq);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
|
|
|
|
return xen_evtchn_port_setup(evtchn);
|
|
}
|
|
|
|
static int xen_irq_info_evtchn_setup(unsigned irq,
|
|
evtchn_port_t evtchn,
|
|
struct xenbus_device *dev)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
int ret;
|
|
|
|
ret = xen_irq_info_common_setup(info, irq, IRQT_EVTCHN, evtchn, 0);
|
|
info->u.interdomain = dev;
|
|
if (dev)
|
|
atomic_inc(&dev->event_channels);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int xen_irq_info_ipi_setup(unsigned cpu,
|
|
unsigned irq,
|
|
evtchn_port_t evtchn,
|
|
enum ipi_vector ipi)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
info->u.ipi = ipi;
|
|
|
|
per_cpu(ipi_to_irq, cpu)[ipi] = irq;
|
|
|
|
return xen_irq_info_common_setup(info, irq, IRQT_IPI, evtchn, 0);
|
|
}
|
|
|
|
static int xen_irq_info_virq_setup(unsigned cpu,
|
|
unsigned irq,
|
|
evtchn_port_t evtchn,
|
|
unsigned virq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
info->u.virq = virq;
|
|
|
|
per_cpu(virq_to_irq, cpu)[virq] = irq;
|
|
|
|
return xen_irq_info_common_setup(info, irq, IRQT_VIRQ, evtchn, 0);
|
|
}
|
|
|
|
static int xen_irq_info_pirq_setup(unsigned irq,
|
|
evtchn_port_t evtchn,
|
|
unsigned pirq,
|
|
unsigned gsi,
|
|
uint16_t domid,
|
|
unsigned char flags)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
info->u.pirq.pirq = pirq;
|
|
info->u.pirq.gsi = gsi;
|
|
info->u.pirq.domid = domid;
|
|
info->u.pirq.flags = flags;
|
|
|
|
return xen_irq_info_common_setup(info, irq, IRQT_PIRQ, evtchn, 0);
|
|
}
|
|
|
|
static void xen_irq_info_cleanup(struct irq_info *info)
|
|
{
|
|
set_evtchn_to_irq(info->evtchn, -1);
|
|
xen_evtchn_port_remove(info->evtchn, info->cpu);
|
|
info->evtchn = 0;
|
|
channels_on_cpu_dec(info);
|
|
}
|
|
|
|
/*
|
|
* Accessors for packed IRQ information.
|
|
*/
|
|
evtchn_port_t evtchn_from_irq(unsigned irq)
|
|
{
|
|
const struct irq_info *info = NULL;
|
|
|
|
if (likely(irq < nr_irqs))
|
|
info = info_for_irq(irq);
|
|
if (!info)
|
|
return 0;
|
|
|
|
return info->evtchn;
|
|
}
|
|
|
|
unsigned int irq_from_evtchn(evtchn_port_t evtchn)
|
|
{
|
|
return get_evtchn_to_irq(evtchn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_from_evtchn);
|
|
|
|
int irq_from_virq(unsigned int cpu, unsigned int virq)
|
|
{
|
|
return per_cpu(virq_to_irq, cpu)[virq];
|
|
}
|
|
|
|
static enum ipi_vector ipi_from_irq(unsigned irq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
BUG_ON(info == NULL);
|
|
BUG_ON(info->type != IRQT_IPI);
|
|
|
|
return info->u.ipi;
|
|
}
|
|
|
|
static unsigned virq_from_irq(unsigned irq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
BUG_ON(info == NULL);
|
|
BUG_ON(info->type != IRQT_VIRQ);
|
|
|
|
return info->u.virq;
|
|
}
|
|
|
|
static unsigned pirq_from_irq(unsigned irq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
BUG_ON(info == NULL);
|
|
BUG_ON(info->type != IRQT_PIRQ);
|
|
|
|
return info->u.pirq.pirq;
|
|
}
|
|
|
|
static enum xen_irq_type type_from_irq(unsigned irq)
|
|
{
|
|
return info_for_irq(irq)->type;
|
|
}
|
|
|
|
static unsigned cpu_from_irq(unsigned irq)
|
|
{
|
|
return info_for_irq(irq)->cpu;
|
|
}
|
|
|
|
unsigned int cpu_from_evtchn(evtchn_port_t evtchn)
|
|
{
|
|
int irq = get_evtchn_to_irq(evtchn);
|
|
unsigned ret = 0;
|
|
|
|
if (irq != -1)
|
|
ret = cpu_from_irq(irq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void do_mask(struct irq_info *info, u8 reason)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (!info->mask_reason)
|
|
mask_evtchn(info->evtchn);
|
|
|
|
info->mask_reason |= reason;
|
|
|
|
raw_spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static void do_unmask(struct irq_info *info, u8 reason)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&info->lock, flags);
|
|
|
|
info->mask_reason &= ~reason;
|
|
|
|
if (!info->mask_reason)
|
|
unmask_evtchn(info->evtchn);
|
|
|
|
raw_spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
#ifdef CONFIG_X86
|
|
static bool pirq_check_eoi_map(unsigned irq)
|
|
{
|
|
return test_bit(pirq_from_irq(irq), pirq_eoi_map);
|
|
}
|
|
#endif
|
|
|
|
static bool pirq_needs_eoi_flag(unsigned irq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
BUG_ON(info->type != IRQT_PIRQ);
|
|
|
|
return info->u.pirq.flags & PIRQ_NEEDS_EOI;
|
|
}
|
|
|
|
static void bind_evtchn_to_cpu(evtchn_port_t evtchn, unsigned int cpu,
|
|
bool force_affinity)
|
|
{
|
|
int irq = get_evtchn_to_irq(evtchn);
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
BUG_ON(irq == -1);
|
|
|
|
if (IS_ENABLED(CONFIG_SMP) && force_affinity) {
|
|
cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(cpu));
|
|
cpumask_copy(irq_get_effective_affinity_mask(irq),
|
|
cpumask_of(cpu));
|
|
}
|
|
|
|
xen_evtchn_port_bind_to_cpu(evtchn, cpu, info->cpu);
|
|
|
|
channels_on_cpu_dec(info);
|
|
info->cpu = cpu;
|
|
channels_on_cpu_inc(info);
|
|
}
|
|
|
|
/**
|
|
* notify_remote_via_irq - send event to remote end of event channel via irq
|
|
* @irq: irq of event channel to send event to
|
|
*
|
|
* Unlike notify_remote_via_evtchn(), this is safe to use across
|
|
* save/restore. Notifications on a broken connection are silently
|
|
* dropped.
|
|
*/
|
|
void notify_remote_via_irq(int irq)
|
|
{
|
|
evtchn_port_t evtchn = evtchn_from_irq(irq);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
notify_remote_via_evtchn(evtchn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(notify_remote_via_irq);
|
|
|
|
struct lateeoi_work {
|
|
struct delayed_work delayed;
|
|
spinlock_t eoi_list_lock;
|
|
struct list_head eoi_list;
|
|
};
|
|
|
|
static DEFINE_PER_CPU(struct lateeoi_work, lateeoi);
|
|
|
|
static void lateeoi_list_del(struct irq_info *info)
|
|
{
|
|
struct lateeoi_work *eoi = &per_cpu(lateeoi, info->eoi_cpu);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&eoi->eoi_list_lock, flags);
|
|
list_del_init(&info->eoi_list);
|
|
spin_unlock_irqrestore(&eoi->eoi_list_lock, flags);
|
|
}
|
|
|
|
static void lateeoi_list_add(struct irq_info *info)
|
|
{
|
|
struct lateeoi_work *eoi = &per_cpu(lateeoi, info->eoi_cpu);
|
|
struct irq_info *elem;
|
|
u64 now = get_jiffies_64();
|
|
unsigned long delay;
|
|
unsigned long flags;
|
|
|
|
if (now < info->eoi_time)
|
|
delay = info->eoi_time - now;
|
|
else
|
|
delay = 1;
|
|
|
|
spin_lock_irqsave(&eoi->eoi_list_lock, flags);
|
|
|
|
if (list_empty(&eoi->eoi_list)) {
|
|
list_add(&info->eoi_list, &eoi->eoi_list);
|
|
mod_delayed_work_on(info->eoi_cpu, system_wq,
|
|
&eoi->delayed, delay);
|
|
} else {
|
|
list_for_each_entry_reverse(elem, &eoi->eoi_list, eoi_list) {
|
|
if (elem->eoi_time <= info->eoi_time)
|
|
break;
|
|
}
|
|
list_add(&info->eoi_list, &elem->eoi_list);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&eoi->eoi_list_lock, flags);
|
|
}
|
|
|
|
static void xen_irq_lateeoi_locked(struct irq_info *info, bool spurious)
|
|
{
|
|
evtchn_port_t evtchn;
|
|
unsigned int cpu;
|
|
unsigned int delay = 0;
|
|
|
|
evtchn = info->evtchn;
|
|
if (!VALID_EVTCHN(evtchn) || !list_empty(&info->eoi_list))
|
|
return;
|
|
|
|
if (spurious) {
|
|
struct xenbus_device *dev = info->u.interdomain;
|
|
unsigned int threshold = 1;
|
|
|
|
if (dev && dev->spurious_threshold)
|
|
threshold = dev->spurious_threshold;
|
|
|
|
if ((1 << info->spurious_cnt) < (HZ << 2)) {
|
|
if (info->spurious_cnt != 0xFF)
|
|
info->spurious_cnt++;
|
|
}
|
|
if (info->spurious_cnt > threshold) {
|
|
delay = 1 << (info->spurious_cnt - 1 - threshold);
|
|
if (delay > HZ)
|
|
delay = HZ;
|
|
if (!info->eoi_time)
|
|
info->eoi_cpu = smp_processor_id();
|
|
info->eoi_time = get_jiffies_64() + delay;
|
|
if (dev)
|
|
atomic_add(delay, &dev->jiffies_eoi_delayed);
|
|
}
|
|
if (dev)
|
|
atomic_inc(&dev->spurious_events);
|
|
} else {
|
|
info->spurious_cnt = 0;
|
|
}
|
|
|
|
cpu = info->eoi_cpu;
|
|
if (info->eoi_time &&
|
|
(info->irq_epoch == per_cpu(irq_epoch, cpu) || delay)) {
|
|
lateeoi_list_add(info);
|
|
return;
|
|
}
|
|
|
|
info->eoi_time = 0;
|
|
|
|
/* is_active hasn't been reset yet, do it now. */
|
|
smp_store_release(&info->is_active, 0);
|
|
do_unmask(info, EVT_MASK_REASON_EOI_PENDING);
|
|
}
|
|
|
|
static void xen_irq_lateeoi_worker(struct work_struct *work)
|
|
{
|
|
struct lateeoi_work *eoi;
|
|
struct irq_info *info;
|
|
u64 now = get_jiffies_64();
|
|
unsigned long flags;
|
|
|
|
eoi = container_of(to_delayed_work(work), struct lateeoi_work, delayed);
|
|
|
|
read_lock_irqsave(&evtchn_rwlock, flags);
|
|
|
|
while (true) {
|
|
spin_lock(&eoi->eoi_list_lock);
|
|
|
|
info = list_first_entry_or_null(&eoi->eoi_list, struct irq_info,
|
|
eoi_list);
|
|
|
|
if (info == NULL || now < info->eoi_time) {
|
|
spin_unlock(&eoi->eoi_list_lock);
|
|
break;
|
|
}
|
|
|
|
list_del_init(&info->eoi_list);
|
|
|
|
spin_unlock(&eoi->eoi_list_lock);
|
|
|
|
info->eoi_time = 0;
|
|
|
|
xen_irq_lateeoi_locked(info, false);
|
|
}
|
|
|
|
if (info)
|
|
mod_delayed_work_on(info->eoi_cpu, system_wq,
|
|
&eoi->delayed, info->eoi_time - now);
|
|
|
|
read_unlock_irqrestore(&evtchn_rwlock, flags);
|
|
}
|
|
|
|
static void xen_cpu_init_eoi(unsigned int cpu)
|
|
{
|
|
struct lateeoi_work *eoi = &per_cpu(lateeoi, cpu);
|
|
|
|
INIT_DELAYED_WORK(&eoi->delayed, xen_irq_lateeoi_worker);
|
|
spin_lock_init(&eoi->eoi_list_lock);
|
|
INIT_LIST_HEAD(&eoi->eoi_list);
|
|
}
|
|
|
|
void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags)
|
|
{
|
|
struct irq_info *info;
|
|
unsigned long flags;
|
|
|
|
read_lock_irqsave(&evtchn_rwlock, flags);
|
|
|
|
info = info_for_irq(irq);
|
|
|
|
if (info)
|
|
xen_irq_lateeoi_locked(info, eoi_flags & XEN_EOI_FLAG_SPURIOUS);
|
|
|
|
read_unlock_irqrestore(&evtchn_rwlock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_irq_lateeoi);
|
|
|
|
static void xen_irq_init(unsigned irq)
|
|
{
|
|
struct irq_info *info;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (info == NULL)
|
|
panic("Unable to allocate metadata for IRQ%d\n", irq);
|
|
|
|
info->type = IRQT_UNBOUND;
|
|
info->refcnt = -1;
|
|
|
|
set_info_for_irq(irq, info);
|
|
/*
|
|
* Interrupt affinity setting can be immediate. No point
|
|
* in delaying it until an interrupt is handled.
|
|
*/
|
|
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
|
|
|
|
INIT_LIST_HEAD(&info->eoi_list);
|
|
list_add_tail(&info->list, &xen_irq_list_head);
|
|
}
|
|
|
|
static int __must_check xen_allocate_irqs_dynamic(int nvec)
|
|
{
|
|
int i, irq = irq_alloc_descs(-1, 0, nvec, -1);
|
|
|
|
if (irq >= 0) {
|
|
for (i = 0; i < nvec; i++)
|
|
xen_irq_init(irq + i);
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
|
|
static inline int __must_check xen_allocate_irq_dynamic(void)
|
|
{
|
|
|
|
return xen_allocate_irqs_dynamic(1);
|
|
}
|
|
|
|
static int __must_check xen_allocate_irq_gsi(unsigned gsi)
|
|
{
|
|
int irq;
|
|
|
|
/*
|
|
* A PV guest has no concept of a GSI (since it has no ACPI
|
|
* nor access to/knowledge of the physical APICs). Therefore
|
|
* all IRQs are dynamically allocated from the entire IRQ
|
|
* space.
|
|
*/
|
|
if (xen_pv_domain() && !xen_initial_domain())
|
|
return xen_allocate_irq_dynamic();
|
|
|
|
/* Legacy IRQ descriptors are already allocated by the arch. */
|
|
if (gsi < nr_legacy_irqs())
|
|
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 = info_for_irq(irq);
|
|
unsigned long flags;
|
|
|
|
if (WARN_ON(!info))
|
|
return;
|
|
|
|
write_lock_irqsave(&evtchn_rwlock, flags);
|
|
|
|
if (!list_empty(&info->eoi_list))
|
|
lateeoi_list_del(info);
|
|
|
|
list_del(&info->list);
|
|
|
|
set_info_for_irq(irq, NULL);
|
|
|
|
WARN_ON(info->refcnt > 0);
|
|
|
|
write_unlock_irqrestore(&evtchn_rwlock, flags);
|
|
|
|
kfree(info);
|
|
|
|
/* Legacy IRQ descriptors are managed by the arch. */
|
|
if (irq < nr_legacy_irqs())
|
|
return;
|
|
|
|
irq_free_desc(irq);
|
|
}
|
|
|
|
static void xen_evtchn_close(evtchn_port_t port)
|
|
{
|
|
struct evtchn_close close;
|
|
|
|
close.port = port;
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
|
|
BUG();
|
|
}
|
|
|
|
/* Not called for lateeoi events. */
|
|
static void event_handler_exit(struct irq_info *info)
|
|
{
|
|
smp_store_release(&info->is_active, 0);
|
|
clear_evtchn(info->evtchn);
|
|
}
|
|
|
|
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 void eoi_pirq(struct irq_data *data)
|
|
{
|
|
struct irq_info *info = info_for_irq(data->irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
|
|
int rc = 0;
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return;
|
|
|
|
event_handler_exit(info);
|
|
|
|
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);
|
|
evtchn_port_t 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) {
|
|
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, false);
|
|
|
|
rc = xen_evtchn_port_setup(evtchn);
|
|
if (rc)
|
|
goto err;
|
|
|
|
out:
|
|
do_unmask(info, EVT_MASK_REASON_EXPLICIT);
|
|
|
|
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);
|
|
evtchn_port_t evtchn = evtchn_from_irq(irq);
|
|
|
|
BUG_ON(info->type != IRQT_PIRQ);
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return;
|
|
|
|
do_mask(info, EVT_MASK_REASON_EXPLICIT);
|
|
xen_evtchn_close(evtchn);
|
|
xen_irq_info_cleanup(info);
|
|
}
|
|
|
|
static void enable_pirq(struct irq_data *data)
|
|
{
|
|
enable_dynirq(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)
|
|
{
|
|
evtchn_port_t evtchn = evtchn_from_irq(irq);
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
if (info->refcnt > 0) {
|
|
info->refcnt--;
|
|
if (info->refcnt != 0)
|
|
return;
|
|
}
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
unsigned int cpu = cpu_from_irq(irq);
|
|
struct xenbus_device *dev;
|
|
|
|
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;
|
|
case IRQT_EVTCHN:
|
|
dev = info->u.interdomain;
|
|
if (dev)
|
|
atomic_dec(&dev->event_channels);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
xen_irq_info_cleanup(info);
|
|
}
|
|
|
|
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;
|
|
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:
|
|
while (nvec--)
|
|
__unbind_from_irq(irq + nvec);
|
|
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);
|
|
|
|
static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
|
|
struct xenbus_device *dev)
|
|
{
|
|
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, chip,
|
|
handle_edge_irq, "event");
|
|
|
|
ret = xen_irq_info_evtchn_setup(irq, evtchn, dev);
|
|
if (ret < 0) {
|
|
__unbind_from_irq(irq);
|
|
irq = ret;
|
|
goto out;
|
|
}
|
|
/*
|
|
* New interdomain events are initially bound to vCPU0 This
|
|
* is required to setup the event channel in the first
|
|
* place and also important for UP guests because the
|
|
* affinity setting is not invoked on them so nothing would
|
|
* bind the channel.
|
|
*/
|
|
bind_evtchn_to_cpu(evtchn, 0, false);
|
|
} 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;
|
|
}
|
|
|
|
int bind_evtchn_to_irq(evtchn_port_t evtchn)
|
|
{
|
|
return bind_evtchn_to_irq_chip(evtchn, &xen_dynamic_chip, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
|
|
|
|
int bind_evtchn_to_irq_lateeoi(evtchn_port_t evtchn)
|
|
{
|
|
return bind_evtchn_to_irq_chip(evtchn, &xen_lateeoi_chip, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_evtchn_to_irq_lateeoi);
|
|
|
|
static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
|
|
{
|
|
struct evtchn_bind_ipi bind_ipi;
|
|
evtchn_port_t evtchn;
|
|
int ret, 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 = xen_vcpu_nr(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;
|
|
}
|
|
/*
|
|
* Force the affinity mask to the target CPU so proc shows
|
|
* the correct target.
|
|
*/
|
|
bind_evtchn_to_cpu(evtchn, cpu, true);
|
|
} 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_chip(struct xenbus_device *dev,
|
|
evtchn_port_t remote_port,
|
|
struct irq_chip *chip)
|
|
{
|
|
struct evtchn_bind_interdomain bind_interdomain;
|
|
int err;
|
|
|
|
bind_interdomain.remote_dom = dev->otherend_id;
|
|
bind_interdomain.remote_port = remote_port;
|
|
|
|
err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
|
|
&bind_interdomain);
|
|
|
|
return err ? : bind_evtchn_to_irq_chip(bind_interdomain.local_port,
|
|
chip, dev);
|
|
}
|
|
|
|
int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
|
|
evtchn_port_t remote_port)
|
|
{
|
|
return bind_interdomain_evtchn_to_irq_chip(dev, remote_port,
|
|
&xen_lateeoi_chip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq_lateeoi);
|
|
|
|
static int find_virq(unsigned int virq, unsigned int cpu, evtchn_port_t *evtchn)
|
|
{
|
|
struct evtchn_status status;
|
|
evtchn_port_t port;
|
|
int 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 == xen_vcpu_nr(cpu)) {
|
|
*evtchn = 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;
|
|
evtchn_port_t evtchn = 0;
|
|
int 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 = xen_vcpu_nr(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, &evtchn);
|
|
BUG_ON(ret < 0);
|
|
}
|
|
|
|
ret = xen_irq_info_virq_setup(cpu, irq, evtchn, virq);
|
|
if (ret < 0) {
|
|
__unbind_from_irq(irq);
|
|
irq = ret;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Force the affinity mask for percpu interrupts so proc
|
|
* shows the correct target.
|
|
*/
|
|
bind_evtchn_to_cpu(evtchn, cpu, percpu);
|
|
} 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);
|
|
}
|
|
|
|
static int bind_evtchn_to_irqhandler_chip(evtchn_port_t evtchn,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags,
|
|
const char *devname, void *dev_id,
|
|
struct irq_chip *chip)
|
|
{
|
|
int irq, retval;
|
|
|
|
irq = bind_evtchn_to_irq_chip(evtchn, chip, NULL);
|
|
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;
|
|
}
|
|
|
|
int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags,
|
|
const char *devname, void *dev_id)
|
|
{
|
|
return bind_evtchn_to_irqhandler_chip(evtchn, handler, irqflags,
|
|
devname, dev_id,
|
|
&xen_dynamic_chip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
|
|
|
|
int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags,
|
|
const char *devname, void *dev_id)
|
|
{
|
|
return bind_evtchn_to_irqhandler_chip(evtchn, handler, irqflags,
|
|
devname, dev_id,
|
|
&xen_lateeoi_chip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler_lateeoi);
|
|
|
|
static int bind_interdomain_evtchn_to_irqhandler_chip(
|
|
struct xenbus_device *dev, evtchn_port_t remote_port,
|
|
irq_handler_t handler, unsigned long irqflags,
|
|
const char *devname, void *dev_id, struct irq_chip *chip)
|
|
{
|
|
int irq, retval;
|
|
|
|
irq = bind_interdomain_evtchn_to_irq_chip(dev, remote_port, chip);
|
|
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;
|
|
}
|
|
|
|
int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev,
|
|
evtchn_port_t remote_port,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags,
|
|
const char *devname,
|
|
void *dev_id)
|
|
{
|
|
return bind_interdomain_evtchn_to_irqhandler_chip(dev,
|
|
remote_port, handler, irqflags, devname,
|
|
dev_id, &xen_lateeoi_chip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler_lateeoi);
|
|
|
|
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 = info_for_irq(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(evtchn_port_t evtchn)
|
|
{
|
|
int irq = get_evtchn_to_irq(evtchn);
|
|
struct irq_info *info;
|
|
|
|
if (irq == -1)
|
|
return -ENOENT;
|
|
|
|
info = info_for_irq(irq);
|
|
|
|
if (!info)
|
|
return -ENOENT;
|
|
|
|
WARN_ON(info->refcnt != -1);
|
|
|
|
info->refcnt = 1;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
|
|
|
|
int evtchn_get(evtchn_port_t 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 = info_for_irq(irq);
|
|
|
|
if (!info)
|
|
goto done;
|
|
|
|
err = -EINVAL;
|
|
if (info->refcnt <= 0 || info->refcnt == SHRT_MAX)
|
|
goto done;
|
|
|
|
info->refcnt++;
|
|
err = 0;
|
|
done:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(evtchn_get);
|
|
|
|
void evtchn_put(evtchn_port_t 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, xen_vcpu_nr(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);
|
|
}
|
|
|
|
struct evtchn_loop_ctrl {
|
|
ktime_t timeout;
|
|
unsigned count;
|
|
bool defer_eoi;
|
|
};
|
|
|
|
void handle_irq_for_port(evtchn_port_t port, struct evtchn_loop_ctrl *ctrl)
|
|
{
|
|
int irq;
|
|
struct irq_info *info;
|
|
struct xenbus_device *dev;
|
|
|
|
irq = get_evtchn_to_irq(port);
|
|
if (irq == -1)
|
|
return;
|
|
|
|
/*
|
|
* Check for timeout every 256 events.
|
|
* We are setting the timeout value only after the first 256
|
|
* events in order to not hurt the common case of few loop
|
|
* iterations. The 256 is basically an arbitrary value.
|
|
*
|
|
* In case we are hitting the timeout we need to defer all further
|
|
* EOIs in order to ensure to leave the event handling loop rather
|
|
* sooner than later.
|
|
*/
|
|
if (!ctrl->defer_eoi && !(++ctrl->count & 0xff)) {
|
|
ktime_t kt = ktime_get();
|
|
|
|
if (!ctrl->timeout) {
|
|
kt = ktime_add_ms(kt,
|
|
jiffies_to_msecs(event_loop_timeout));
|
|
ctrl->timeout = kt;
|
|
} else if (kt > ctrl->timeout) {
|
|
ctrl->defer_eoi = true;
|
|
}
|
|
}
|
|
|
|
info = info_for_irq(irq);
|
|
if (xchg_acquire(&info->is_active, 1))
|
|
return;
|
|
|
|
dev = (info->type == IRQT_EVTCHN) ? info->u.interdomain : NULL;
|
|
if (dev)
|
|
atomic_inc(&dev->events);
|
|
|
|
if (ctrl->defer_eoi) {
|
|
info->eoi_cpu = smp_processor_id();
|
|
info->irq_epoch = __this_cpu_read(irq_epoch);
|
|
info->eoi_time = get_jiffies_64() + event_eoi_delay;
|
|
}
|
|
|
|
generic_handle_irq(irq);
|
|
}
|
|
|
|
static void __xen_evtchn_do_upcall(void)
|
|
{
|
|
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
|
|
int cpu = smp_processor_id();
|
|
struct evtchn_loop_ctrl ctrl = { 0 };
|
|
|
|
read_lock(&evtchn_rwlock);
|
|
|
|
do {
|
|
vcpu_info->evtchn_upcall_pending = 0;
|
|
|
|
xen_evtchn_handle_events(cpu, &ctrl);
|
|
|
|
BUG_ON(!irqs_disabled());
|
|
|
|
virt_rmb(); /* Hypervisor can set upcall pending. */
|
|
|
|
} while (vcpu_info->evtchn_upcall_pending);
|
|
|
|
read_unlock(&evtchn_rwlock);
|
|
|
|
/*
|
|
* Increment irq_epoch only now to defer EOIs only for
|
|
* xen_irq_lateeoi() invocations occurring from inside the loop
|
|
* above.
|
|
*/
|
|
__this_cpu_inc(irq_epoch);
|
|
}
|
|
|
|
void xen_evtchn_do_upcall(struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
|
|
|
irq_enter();
|
|
|
|
__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(evtchn_port_t 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, NULL);
|
|
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
bind_evtchn_to_cpu(evtchn, info->cpu, false);
|
|
|
|
/* Unmask the event channel. */
|
|
enable_irq(irq);
|
|
}
|
|
|
|
/* Rebind an evtchn so that it gets delivered to a specific cpu */
|
|
static int xen_rebind_evtchn_to_cpu(struct irq_info *info, unsigned int tcpu)
|
|
{
|
|
struct evtchn_bind_vcpu bind_vcpu;
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
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 = xen_vcpu_nr(tcpu);
|
|
|
|
/*
|
|
* Mask the event while changing the VCPU binding to prevent
|
|
* it being delivered on an unexpected VCPU.
|
|
*/
|
|
do_mask(info, EVT_MASK_REASON_TEMPORARY);
|
|
|
|
/*
|
|
* 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, false);
|
|
|
|
do_unmask(info, EVT_MASK_REASON_TEMPORARY);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the CPU within @dest mask which has the least number of channels
|
|
* assigned. This is not precise as the per cpu counts can be modified
|
|
* concurrently.
|
|
*/
|
|
static unsigned int select_target_cpu(const struct cpumask *dest)
|
|
{
|
|
unsigned int cpu, best_cpu = UINT_MAX, minch = UINT_MAX;
|
|
|
|
for_each_cpu_and(cpu, dest, cpu_online_mask) {
|
|
unsigned int curch = atomic_read(&channels_on_cpu[cpu]);
|
|
|
|
if (curch < minch) {
|
|
minch = curch;
|
|
best_cpu = cpu;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Catch the unlikely case that dest contains no online CPUs. Can't
|
|
* recurse.
|
|
*/
|
|
if (best_cpu == UINT_MAX)
|
|
return select_target_cpu(cpu_online_mask);
|
|
|
|
return best_cpu;
|
|
}
|
|
|
|
static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
|
|
bool force)
|
|
{
|
|
unsigned int tcpu = select_target_cpu(dest);
|
|
int ret;
|
|
|
|
ret = xen_rebind_evtchn_to_cpu(info_for_irq(data->irq), tcpu);
|
|
if (!ret)
|
|
irq_data_update_effective_affinity(data, cpumask_of(tcpu));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void enable_dynirq(struct irq_data *data)
|
|
{
|
|
struct irq_info *info = info_for_irq(data->irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
do_unmask(info, EVT_MASK_REASON_EXPLICIT);
|
|
}
|
|
|
|
static void disable_dynirq(struct irq_data *data)
|
|
{
|
|
struct irq_info *info = info_for_irq(data->irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
do_mask(info, EVT_MASK_REASON_EXPLICIT);
|
|
}
|
|
|
|
static void ack_dynirq(struct irq_data *data)
|
|
{
|
|
struct irq_info *info = info_for_irq(data->irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
event_handler_exit(info);
|
|
}
|
|
|
|
static void mask_ack_dynirq(struct irq_data *data)
|
|
{
|
|
disable_dynirq(data);
|
|
ack_dynirq(data);
|
|
}
|
|
|
|
static void lateeoi_ack_dynirq(struct irq_data *data)
|
|
{
|
|
struct irq_info *info = info_for_irq(data->irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
do_mask(info, EVT_MASK_REASON_EOI_PENDING);
|
|
/*
|
|
* Don't call event_handler_exit().
|
|
* Need to keep is_active non-zero in order to ignore re-raised
|
|
* events after cpu affinity changes while a lateeoi is pending.
|
|
*/
|
|
clear_evtchn(evtchn);
|
|
}
|
|
}
|
|
|
|
static void lateeoi_mask_ack_dynirq(struct irq_data *data)
|
|
{
|
|
struct irq_info *info = info_for_irq(data->irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
do_mask(info, EVT_MASK_REASON_EXPLICIT);
|
|
event_handler_exit(info);
|
|
}
|
|
}
|
|
|
|
static int retrigger_dynirq(struct irq_data *data)
|
|
{
|
|
struct irq_info *info = info_for_irq(data->irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return 0;
|
|
|
|
do_mask(info, EVT_MASK_REASON_TEMPORARY);
|
|
set_evtchn(evtchn);
|
|
do_unmask(info, EVT_MASK_REASON_TEMPORARY);
|
|
|
|
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;
|
|
evtchn_port_t evtchn;
|
|
int virq, irq;
|
|
|
|
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 = xen_vcpu_nr(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);
|
|
/* The affinity mask is still valid */
|
|
bind_evtchn_to_cpu(evtchn, cpu, false);
|
|
}
|
|
}
|
|
|
|
static void restore_cpu_ipis(unsigned int cpu)
|
|
{
|
|
struct evtchn_bind_ipi bind_ipi;
|
|
evtchn_port_t evtchn;
|
|
int ipi, irq;
|
|
|
|
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 = xen_vcpu_nr(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);
|
|
/* The affinity mask is still valid */
|
|
bind_evtchn_to_cpu(evtchn, cpu, false);
|
|
}
|
|
}
|
|
|
|
/* Clear an irq's pending state, in preparation for polling on it */
|
|
void xen_clear_irq_pending(int irq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
evtchn_port_t evtchn = info ? info->evtchn : 0;
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
event_handler_exit(info);
|
|
}
|
|
EXPORT_SYMBOL(xen_clear_irq_pending);
|
|
void xen_set_irq_pending(int irq)
|
|
{
|
|
evtchn_port_t evtchn = evtchn_from_irq(irq);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
set_evtchn(evtchn);
|
|
}
|
|
|
|
bool xen_test_irq_pending(int irq)
|
|
{
|
|
evtchn_port_t 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_resume();
|
|
|
|
/* No IRQ <-> event-channel mappings. */
|
|
list_for_each_entry(info, &xen_irq_list_head, list) {
|
|
/* Zap event-channel binding */
|
|
info->evtchn = 0;
|
|
/* Adjust accounting */
|
|
channels_on_cpu_dec(info);
|
|
}
|
|
|
|
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_lateeoi_chip __read_mostly = {
|
|
/* The chip name needs to contain "xen-dyn" for irqbalance to work. */
|
|
.name = "xen-dyn-lateeoi",
|
|
|
|
.irq_disable = disable_dynirq,
|
|
.irq_mask = disable_dynirq,
|
|
.irq_unmask = enable_dynirq,
|
|
|
|
.irq_ack = lateeoi_ack_dynirq,
|
|
.irq_mask_ack = lateeoi_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,
|
|
};
|
|
|
|
#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_setup_callback_vector(void)
|
|
{
|
|
uint64_t callback_via;
|
|
|
|
if (xen_have_vector_callback) {
|
|
callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
|
|
if (xen_set_callback_via(callback_via)) {
|
|
pr_err("Request for Xen HVM callback vector failed\n");
|
|
xen_have_vector_callback = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static __init void xen_alloc_callback_vector(void)
|
|
{
|
|
if (!xen_have_vector_callback)
|
|
return;
|
|
|
|
pr_info("Xen HVM callback vector for event delivery is enabled\n");
|
|
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_xen_hvm_callback);
|
|
}
|
|
#else
|
|
void xen_setup_callback_vector(void) {}
|
|
static inline void xen_alloc_callback_vector(void) {}
|
|
#endif
|
|
|
|
bool xen_fifo_events = true;
|
|
module_param_named(fifo_events, xen_fifo_events, bool, 0);
|
|
|
|
static int xen_evtchn_cpu_prepare(unsigned int cpu)
|
|
{
|
|
int ret = 0;
|
|
|
|
xen_cpu_init_eoi(cpu);
|
|
|
|
if (evtchn_ops->percpu_init)
|
|
ret = evtchn_ops->percpu_init(cpu);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int xen_evtchn_cpu_dead(unsigned int cpu)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (evtchn_ops->percpu_deinit)
|
|
ret = evtchn_ops->percpu_deinit(cpu);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void __init xen_init_IRQ(void)
|
|
{
|
|
int ret = -EINVAL;
|
|
evtchn_port_t evtchn;
|
|
|
|
if (xen_fifo_events)
|
|
ret = xen_evtchn_fifo_init();
|
|
if (ret < 0) {
|
|
xen_evtchn_2l_init();
|
|
xen_fifo_events = false;
|
|
}
|
|
|
|
xen_cpu_init_eoi(smp_processor_id());
|
|
|
|
cpuhp_setup_state_nocalls(CPUHP_XEN_EVTCHN_PREPARE,
|
|
"xen/evtchn:prepare",
|
|
xen_evtchn_cpu_prepare, xen_evtchn_cpu_dead);
|
|
|
|
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. */
|
|
for (evtchn = 0; evtchn < xen_evtchn_nr_channels(); evtchn++)
|
|
mask_evtchn(evtchn);
|
|
|
|
pirq_needs_eoi = pirq_needs_eoi_flag;
|
|
|
|
#ifdef CONFIG_X86
|
|
if (xen_pv_domain()) {
|
|
if (xen_initial_domain())
|
|
pci_xen_initial_domain();
|
|
}
|
|
if (xen_feature(XENFEAT_hvm_callback_vector)) {
|
|
xen_setup_callback_vector();
|
|
xen_alloc_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);
|
|
if (rc != 0) {
|
|
free_page((unsigned long) pirq_eoi_map);
|
|
pirq_eoi_map = NULL;
|
|
} else
|
|
pirq_needs_eoi = pirq_check_eoi_map;
|
|
}
|
|
#endif
|
|
}
|