mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
- Xen Trusted Platform Module (TPM) frontend driver - with the backend in MiniOS.
- Scalability improvements in event channel.
- Two extra Xen co-maintainers (David, Boris) and one going away (Jeremy)
Bug-fixes:
- Make the 1:1 mapping work during early bootup on selective regions.
- Add scratch page to balloon driver to deal with unexpected code still holding
on stale pages.
- Allow NMIs on PV guests (64-bit only)
- Remove unnecessary TLB flush in M2P code.
- Fixes duplicate callbacks in Xen granttable code.
- Fixes in PRIVCMD_MMAPBATCH ioctls to allow retries
- Fix for events being lost due to rescheduling on different VCPUs.
- More documentation.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.14 (GNU/Linux)
iQEcBAABAgAGBQJSJgGgAAoJEFjIrFwIi8fJ4asH+gKp0aauPEdHtmn7rLfZUUJ5
uuvWBiXiVVYMFz81NXlZ1WoAMuDuVA45Eu785uPRb9oUHDi0W8LO4Dqr+9lJTrXJ
KiMvTXmOLSfSdjRlDI4jCoxBdg8tpbT3oJkXsFcHnrd5d4oTFGb0uuo5nFYPDicZ
BGogDclzcqtlYl/2LUb+6vUXUQd77n0oW7RQ4yAaw3Qdj381om3Dmoeat8QU9Kdo
Q4dhsHS6YAGR5R+G0zPfVOoKvSGoGV0NUdXr19QpYArGxKXcmiPjrgAJ/NGLsxvm
8AbPjmQzOFJmUclHiiej6kvBsh2ZTYAesJMSAFLWD7EndXii7zljyJv0PIJ//uQ=
=hNDW
-----END PGP SIGNATURE-----
Merge tag 'stable/for-linus-3.12-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull Xen updates from Konrad Rzeszutek Wilk:
"A couple of features and a ton of bug-fixes. There is also some
maintership changes. Jeremy is enjoying the full-time work at the
startup and as much as he would love to help - he can't find the time.
I have a bunch of other things that I promised to work on - paravirt
diet, get SWIOTLB working everywhere, etc, but haven't been able to
find the time.
As such both David Vrabel and Boris Ostrovsky have graciously
volunteered to help with the maintership role. They will keep the lid
on regressions, bug-fixes, etc. I will be in the background to help -
but eventually there will be less of me doing the Xen GIT pulls and
more of them. Stefano is still doing the ARM/ARM64 and will continue
on doing so.
Features:
- Xen Trusted Platform Module (TPM) frontend driver - with the
backend in MiniOS.
- Scalability improvements in event channel.
- Two extra Xen co-maintainers (David, Boris) and one going away (Jeremy)
Bug-fixes:
- Make the 1:1 mapping work during early bootup on selective regions.
- Add scratch page to balloon driver to deal with unexpected code
still holding on stale pages.
- Allow NMIs on PV guests (64-bit only)
- Remove unnecessary TLB flush in M2P code.
- Fixes duplicate callbacks in Xen granttable code.
- Fixes in PRIVCMD_MMAPBATCH ioctls to allow retries
- Fix for events being lost due to rescheduling on different VCPUs.
- More documentation"
* tag 'stable/for-linus-3.12-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (23 commits)
hvc_xen: Remove unnecessary __GFP_ZERO from kzalloc
drivers/xen-tpmfront: Fix compile issue with missing option.
xen/balloon: don't set P2M entry for auto translated guest
xen/evtchn: double free on error
Xen: Fix retry calls into PRIVCMD_MMAPBATCH*.
xen/pvhvm: Initialize xen panic handler for PVHVM guests
xen/m2p: use GNTTABOP_unmap_and_replace to reinstate the original mapping
xen: fix ARM build after 6efa20e4
MAINTAINERS: Remove Jeremy from the Xen subsystem.
xen/events: document behaviour when scanning the start word for events
x86/xen: during early setup, only 1:1 map the ISA region
x86/xen: disable premption when enabling local irqs
swiotlb-xen: replace dma_length with sg_dma_len() macro
swiotlb: replace dma_length with sg_dma_len() macro
xen/balloon: set a mapping for ballooned out pages
xen/evtchn: improve scalability by using per-user locks
xen/p2m: avoid unneccesary TLB flush in m2p_remove_override()
MAINTAINERS: Add in two extra co-maintainers of the Xen tree.
MAINTAINERS: Update the Xen subsystem's with proper mailing list.
xen: replace strict_strtoul() with kstrtoul()
...
1935 lines
44 KiB
C
1935 lines
44 KiB
C
/*
|
|
* 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/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/irqnr.h>
|
|
#include <linux/pci.h>
|
|
|
|
#ifdef CONFIG_X86
|
|
#include <asm/desc.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/idle.h>
|
|
#include <asm/io_apic.h>
|
|
#include <asm/xen/page.h>
|
|
#include <asm/xen/pci.h>
|
|
#endif
|
|
#include <asm/sync_bitops.h>
|
|
#include <asm/xen/hypercall.h>
|
|
#include <asm/xen/hypervisor.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 <asm/hw_irq.h>
|
|
|
|
/*
|
|
* 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);
|
|
|
|
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};
|
|
|
|
/* 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 - physical IRQ, GSI, flags, and owner domain
|
|
* VIRQ - virq number
|
|
* IPI - IPI vector
|
|
* EVTCHN -
|
|
*/
|
|
struct irq_info {
|
|
struct list_head list;
|
|
int refcnt;
|
|
enum xen_irq_type type; /* type */
|
|
unsigned irq;
|
|
unsigned short evtchn; /* event channel */
|
|
unsigned short cpu; /* cpu bound */
|
|
|
|
union {
|
|
unsigned short virq;
|
|
enum ipi_vector ipi;
|
|
struct {
|
|
unsigned short pirq;
|
|
unsigned short gsi;
|
|
unsigned char flags;
|
|
uint16_t domid;
|
|
} pirq;
|
|
} u;
|
|
};
|
|
#define PIRQ_NEEDS_EOI (1 << 0)
|
|
#define PIRQ_SHAREABLE (1 << 1)
|
|
|
|
static int *evtchn_to_irq;
|
|
#ifdef CONFIG_X86
|
|
static unsigned long *pirq_eoi_map;
|
|
#endif
|
|
static bool (*pirq_needs_eoi)(unsigned irq);
|
|
|
|
/*
|
|
* Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
|
|
* careful to only use bitops which allow for this (e.g
|
|
* test_bit/find_first_bit and friends but not __ffs) and to pass
|
|
* BITS_PER_EVTCHN_WORD as the bitmask length.
|
|
*/
|
|
#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
|
|
/*
|
|
* Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
|
|
* array. Primarily to avoid long lines (hence the terse name).
|
|
*/
|
|
#define BM(x) (unsigned long *)(x)
|
|
/* Find the first set bit in a evtchn mask */
|
|
#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
|
|
|
|
static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
|
|
cpu_evtchn_mask);
|
|
|
|
/* Xen will never allocate port zero for any purpose. */
|
|
#define VALID_EVTCHN(chn) ((chn) != 0)
|
|
|
|
static struct irq_chip xen_dynamic_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);
|
|
|
|
/* Get info for IRQ */
|
|
static struct irq_info *info_for_irq(unsigned irq)
|
|
{
|
|
return irq_get_handler_data(irq);
|
|
}
|
|
|
|
/* Constructors for packed IRQ information. */
|
|
static void xen_irq_info_common_init(struct irq_info *info,
|
|
unsigned irq,
|
|
enum xen_irq_type type,
|
|
unsigned short evtchn,
|
|
unsigned short cpu)
|
|
{
|
|
|
|
BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
|
|
|
|
info->type = type;
|
|
info->irq = irq;
|
|
info->evtchn = evtchn;
|
|
info->cpu = cpu;
|
|
|
|
evtchn_to_irq[evtchn] = irq;
|
|
|
|
irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
|
|
}
|
|
|
|
static void xen_irq_info_evtchn_init(unsigned irq,
|
|
unsigned short evtchn)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0);
|
|
}
|
|
|
|
static void xen_irq_info_ipi_init(unsigned cpu,
|
|
unsigned irq,
|
|
unsigned short evtchn,
|
|
enum ipi_vector ipi)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0);
|
|
|
|
info->u.ipi = ipi;
|
|
|
|
per_cpu(ipi_to_irq, cpu)[ipi] = irq;
|
|
}
|
|
|
|
static void xen_irq_info_virq_init(unsigned cpu,
|
|
unsigned irq,
|
|
unsigned short evtchn,
|
|
unsigned short virq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0);
|
|
|
|
info->u.virq = virq;
|
|
|
|
per_cpu(virq_to_irq, cpu)[virq] = irq;
|
|
}
|
|
|
|
static void xen_irq_info_pirq_init(unsigned irq,
|
|
unsigned short evtchn,
|
|
unsigned short pirq,
|
|
unsigned short gsi,
|
|
uint16_t domid,
|
|
unsigned char flags)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0);
|
|
|
|
info->u.pirq.pirq = pirq;
|
|
info->u.pirq.gsi = gsi;
|
|
info->u.pirq.domid = domid;
|
|
info->u.pirq.flags = flags;
|
|
}
|
|
|
|
/*
|
|
* Accessors for packed IRQ information.
|
|
*/
|
|
static unsigned int evtchn_from_irq(unsigned irq)
|
|
{
|
|
if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
|
|
return 0;
|
|
|
|
return info_for_irq(irq)->evtchn;
|
|
}
|
|
|
|
unsigned irq_from_evtchn(unsigned int evtchn)
|
|
{
|
|
return evtchn_to_irq[evtchn];
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_from_evtchn);
|
|
|
|
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;
|
|
}
|
|
|
|
static unsigned int cpu_from_evtchn(unsigned int evtchn)
|
|
{
|
|
int irq = evtchn_to_irq[evtchn];
|
|
unsigned ret = 0;
|
|
|
|
if (irq != -1)
|
|
ret = cpu_from_irq(irq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#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 inline xen_ulong_t active_evtchns(unsigned int cpu,
|
|
struct shared_info *sh,
|
|
unsigned int idx)
|
|
{
|
|
return sh->evtchn_pending[idx] &
|
|
per_cpu(cpu_evtchn_mask, cpu)[idx] &
|
|
~sh->evtchn_mask[idx];
|
|
}
|
|
|
|
static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
|
|
{
|
|
int irq = evtchn_to_irq[chn];
|
|
|
|
BUG_ON(irq == -1);
|
|
#ifdef CONFIG_SMP
|
|
cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
|
|
#endif
|
|
|
|
clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
|
|
set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
|
|
|
|
info_for_irq(irq)->cpu = cpu;
|
|
}
|
|
|
|
static void init_evtchn_cpu_bindings(void)
|
|
{
|
|
int i;
|
|
#ifdef CONFIG_SMP
|
|
struct irq_info *info;
|
|
|
|
/* By default all event channels notify CPU#0. */
|
|
list_for_each_entry(info, &xen_irq_list_head, list) {
|
|
struct irq_desc *desc = irq_to_desc(info->irq);
|
|
cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
|
|
}
|
|
#endif
|
|
|
|
for_each_possible_cpu(i)
|
|
memset(per_cpu(cpu_evtchn_mask, i),
|
|
(i == 0) ? ~0 : 0, NR_EVENT_CHANNELS/8);
|
|
}
|
|
|
|
static inline void clear_evtchn(int port)
|
|
{
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
sync_clear_bit(port, BM(&s->evtchn_pending[0]));
|
|
}
|
|
|
|
static inline void set_evtchn(int port)
|
|
{
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
sync_set_bit(port, BM(&s->evtchn_pending[0]));
|
|
}
|
|
|
|
static inline int test_evtchn(int port)
|
|
{
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
return sync_test_bit(port, BM(&s->evtchn_pending[0]));
|
|
}
|
|
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int evtchn = evtchn_from_irq(irq);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
notify_remote_via_evtchn(evtchn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(notify_remote_via_irq);
|
|
|
|
static void mask_evtchn(int port)
|
|
{
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
sync_set_bit(port, BM(&s->evtchn_mask[0]));
|
|
}
|
|
|
|
static void unmask_evtchn(int port)
|
|
{
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
unsigned int cpu = get_cpu();
|
|
int do_hypercall = 0, evtchn_pending = 0;
|
|
|
|
BUG_ON(!irqs_disabled());
|
|
|
|
if (unlikely((cpu != cpu_from_evtchn(port))))
|
|
do_hypercall = 1;
|
|
else {
|
|
/*
|
|
* Need to clear the mask before checking pending to
|
|
* avoid a race with an event becoming pending.
|
|
*
|
|
* EVTCHNOP_unmask will only trigger an upcall if the
|
|
* mask bit was set, so if a hypercall is needed
|
|
* remask the event.
|
|
*/
|
|
sync_clear_bit(port, BM(&s->evtchn_mask[0]));
|
|
evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
|
|
|
|
if (unlikely(evtchn_pending && xen_hvm_domain())) {
|
|
sync_set_bit(port, BM(&s->evtchn_mask[0]));
|
|
do_hypercall = 1;
|
|
}
|
|
}
|
|
|
|
/* Slow path (hypercall) if this is a non-local port or if this is
|
|
* an hvm domain and an event is pending (hvm domains don't have
|
|
* their own implementation of irq_enable). */
|
|
if (do_hypercall) {
|
|
struct evtchn_unmask unmask = { .port = port };
|
|
(void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
|
|
} else {
|
|
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
|
|
|
|
/*
|
|
* The following is basically the equivalent of
|
|
* 'hw_resend_irq'. Just like a real IO-APIC we 'lose
|
|
* the interrupt edge' if the channel is masked.
|
|
*/
|
|
if (evtchn_pending &&
|
|
!sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
|
|
BM(&vcpu_info->evtchn_pending_sel)))
|
|
vcpu_info->evtchn_upcall_pending = 1;
|
|
}
|
|
|
|
put_cpu();
|
|
}
|
|
|
|
static void xen_irq_init(unsigned irq)
|
|
{
|
|
struct irq_info *info;
|
|
#ifdef CONFIG_SMP
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
|
|
/* By default all event channels notify CPU#0. */
|
|
cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
|
|
#endif
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (info == NULL)
|
|
panic("Unable to allocate metadata for IRQ%d\n", irq);
|
|
|
|
info->type = IRQT_UNBOUND;
|
|
info->refcnt = -1;
|
|
|
|
irq_set_handler_data(irq, info);
|
|
|
|
list_add_tail(&info->list, &xen_irq_list_head);
|
|
}
|
|
|
|
static int __must_check xen_allocate_irq_dynamic(void)
|
|
{
|
|
int first = 0;
|
|
int irq;
|
|
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
/*
|
|
* For an HVM guest or domain 0 which see "real" (emulated or
|
|
* actual respectively) GSIs we allocate dynamic IRQs
|
|
* e.g. those corresponding to event channels or MSIs
|
|
* etc. from the range above those "real" GSIs to avoid
|
|
* collisions.
|
|
*/
|
|
if (xen_initial_domain() || xen_hvm_domain())
|
|
first = get_nr_irqs_gsi();
|
|
#endif
|
|
|
|
irq = irq_alloc_desc_from(first, -1);
|
|
|
|
if (irq >= 0)
|
|
xen_irq_init(irq);
|
|
|
|
return irq;
|
|
}
|
|
|
|
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_IRQS_LEGACY)
|
|
irq = gsi;
|
|
else
|
|
irq = irq_alloc_desc_at(gsi, -1);
|
|
|
|
xen_irq_init(irq);
|
|
|
|
return irq;
|
|
}
|
|
|
|
static void xen_free_irq(unsigned irq)
|
|
{
|
|
struct irq_info *info = irq_get_handler_data(irq);
|
|
|
|
if (WARN_ON(!info))
|
|
return;
|
|
|
|
list_del(&info->list);
|
|
|
|
irq_set_handler_data(irq, NULL);
|
|
|
|
WARN_ON(info->refcnt > 0);
|
|
|
|
kfree(info);
|
|
|
|
/* Legacy IRQ descriptors are managed by the arch. */
|
|
if (irq < NR_IRQS_LEGACY)
|
|
return;
|
|
|
|
irq_free_desc(irq);
|
|
}
|
|
|
|
static void pirq_query_unmask(int irq)
|
|
{
|
|
struct physdev_irq_status_query irq_status;
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
BUG_ON(info->type != IRQT_PIRQ);
|
|
|
|
irq_status.irq = pirq_from_irq(irq);
|
|
if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
|
|
irq_status.flags = 0;
|
|
|
|
info->u.pirq.flags &= ~PIRQ_NEEDS_EOI;
|
|
if (irq_status.flags & XENIRQSTAT_needs_eoi)
|
|
info->u.pirq.flags |= PIRQ_NEEDS_EOI;
|
|
}
|
|
|
|
static bool probing_irq(int irq)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
|
|
return desc && desc->action == NULL;
|
|
}
|
|
|
|
static void eoi_pirq(struct irq_data *data)
|
|
{
|
|
int evtchn = evtchn_from_irq(data->irq);
|
|
struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
|
|
int rc = 0;
|
|
|
|
irq_move_irq(data);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
clear_evtchn(evtchn);
|
|
|
|
if (pirq_needs_eoi(data->irq)) {
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
|
|
WARN_ON(rc);
|
|
}
|
|
}
|
|
|
|
static void mask_ack_pirq(struct irq_data *data)
|
|
{
|
|
disable_dynirq(data);
|
|
eoi_pirq(data);
|
|
}
|
|
|
|
static unsigned int __startup_pirq(unsigned int irq)
|
|
{
|
|
struct evtchn_bind_pirq bind_pirq;
|
|
struct irq_info *info = info_for_irq(irq);
|
|
int evtchn = evtchn_from_irq(irq);
|
|
int rc;
|
|
|
|
BUG_ON(info->type != IRQT_PIRQ);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
goto out;
|
|
|
|
bind_pirq.pirq = pirq_from_irq(irq);
|
|
/* NB. We are happy to share unless we are probing. */
|
|
bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ?
|
|
BIND_PIRQ__WILL_SHARE : 0;
|
|
rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
|
|
if (rc != 0) {
|
|
if (!probing_irq(irq))
|
|
pr_info("Failed to obtain physical IRQ %d\n", irq);
|
|
return 0;
|
|
}
|
|
evtchn = bind_pirq.port;
|
|
|
|
pirq_query_unmask(irq);
|
|
|
|
evtchn_to_irq[evtchn] = irq;
|
|
bind_evtchn_to_cpu(evtchn, 0);
|
|
info->evtchn = evtchn;
|
|
|
|
out:
|
|
unmask_evtchn(evtchn);
|
|
eoi_pirq(irq_get_irq_data(irq));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int startup_pirq(struct irq_data *data)
|
|
{
|
|
return __startup_pirq(data->irq);
|
|
}
|
|
|
|
static void shutdown_pirq(struct irq_data *data)
|
|
{
|
|
struct evtchn_close close;
|
|
unsigned int irq = data->irq;
|
|
struct irq_info *info = info_for_irq(irq);
|
|
int evtchn = evtchn_from_irq(irq);
|
|
|
|
BUG_ON(info->type != IRQT_PIRQ);
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return;
|
|
|
|
mask_evtchn(evtchn);
|
|
|
|
close.port = evtchn;
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
|
|
BUG();
|
|
|
|
bind_evtchn_to_cpu(evtchn, 0);
|
|
evtchn_to_irq[evtchn] = -1;
|
|
info->evtchn = 0;
|
|
}
|
|
|
|
static void enable_pirq(struct irq_data *data)
|
|
{
|
|
startup_pirq(data);
|
|
}
|
|
|
|
static void disable_pirq(struct irq_data *data)
|
|
{
|
|
disable_dynirq(data);
|
|
}
|
|
|
|
int xen_irq_from_gsi(unsigned gsi)
|
|
{
|
|
struct irq_info *info;
|
|
|
|
list_for_each_entry(info, &xen_irq_list_head, list) {
|
|
if (info->type != IRQT_PIRQ)
|
|
continue;
|
|
|
|
if (info->u.pirq.gsi == gsi)
|
|
return info->irq;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
|
|
|
|
/*
|
|
* Do not make any assumptions regarding the relationship between the
|
|
* IRQ number returned here and the Xen pirq argument.
|
|
*
|
|
* Note: We don't assign an event channel until the irq actually started
|
|
* up. Return an existing irq if we've already got one for the gsi.
|
|
*
|
|
* Shareable implies level triggered, not shareable implies edge
|
|
* triggered here.
|
|
*/
|
|
int xen_bind_pirq_gsi_to_irq(unsigned gsi,
|
|
unsigned pirq, int shareable, char *name)
|
|
{
|
|
int irq = -1;
|
|
struct physdev_irq irq_op;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = xen_irq_from_gsi(gsi);
|
|
if (irq != -1) {
|
|
pr_info("%s: returning irq %d for gsi %u\n",
|
|
__func__, irq, gsi);
|
|
goto out;
|
|
}
|
|
|
|
irq = xen_allocate_irq_gsi(gsi);
|
|
if (irq < 0)
|
|
goto out;
|
|
|
|
irq_op.irq = irq;
|
|
irq_op.vector = 0;
|
|
|
|
/* Only the privileged domain can do this. For non-priv, the pcifront
|
|
* driver provides a PCI bus that does the call to do exactly
|
|
* this in the priv domain. */
|
|
if (xen_initial_domain() &&
|
|
HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {
|
|
xen_free_irq(irq);
|
|
irq = -ENOSPC;
|
|
goto out;
|
|
}
|
|
|
|
xen_irq_info_pirq_init(irq, 0, pirq, gsi, DOMID_SELF,
|
|
shareable ? PIRQ_SHAREABLE : 0);
|
|
|
|
pirq_query_unmask(irq);
|
|
/* We try to use the handler with the appropriate semantic for the
|
|
* type of interrupt: if the interrupt is an edge triggered
|
|
* interrupt we use handle_edge_irq.
|
|
*
|
|
* On the other hand if the interrupt is level triggered we use
|
|
* handle_fasteoi_irq like the native code does for this kind of
|
|
* interrupts.
|
|
*
|
|
* Depending on the Xen version, pirq_needs_eoi might return true
|
|
* not only for level triggered interrupts but for edge triggered
|
|
* interrupts too. In any case Xen always honors the eoi mechanism,
|
|
* not injecting any more pirqs of the same kind if the first one
|
|
* hasn't received an eoi yet. Therefore using the fasteoi handler
|
|
* is the right choice either way.
|
|
*/
|
|
if (shareable)
|
|
irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
|
|
handle_fasteoi_irq, name);
|
|
else
|
|
irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
|
|
handle_edge_irq, name);
|
|
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
return irq;
|
|
}
|
|
|
|
#ifdef CONFIG_PCI_MSI
|
|
int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc)
|
|
{
|
|
int rc;
|
|
struct physdev_get_free_pirq op_get_free_pirq;
|
|
|
|
op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI;
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
|
|
|
|
WARN_ONCE(rc == -ENOSYS,
|
|
"hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
|
|
|
|
return rc ? -1 : op_get_free_pirq.pirq;
|
|
}
|
|
|
|
int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
|
|
int pirq, const char *name, domid_t domid)
|
|
{
|
|
int irq, ret;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = xen_allocate_irq_dynamic();
|
|
if (irq < 0)
|
|
goto out;
|
|
|
|
irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
|
|
name);
|
|
|
|
xen_irq_info_pirq_init(irq, 0, pirq, 0, domid, 0);
|
|
ret = irq_set_msi_desc(irq, msidesc);
|
|
if (ret < 0)
|
|
goto error_irq;
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
return irq;
|
|
error_irq:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
xen_free_irq(irq);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
int xen_destroy_irq(int irq)
|
|
{
|
|
struct irq_desc *desc;
|
|
struct physdev_unmap_pirq unmap_irq;
|
|
struct irq_info *info = info_for_irq(irq);
|
|
int rc = -ENOENT;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
desc = irq_to_desc(irq);
|
|
if (!desc)
|
|
goto out;
|
|
|
|
if (xen_initial_domain()) {
|
|
unmap_irq.pirq = info->u.pirq.pirq;
|
|
unmap_irq.domid = info->u.pirq.domid;
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
|
|
/* If another domain quits without making the pci_disable_msix
|
|
* call, the Xen hypervisor takes care of freeing the PIRQs
|
|
* (free_domain_pirqs).
|
|
*/
|
|
if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF))
|
|
pr_info("domain %d does not have %d anymore\n",
|
|
info->u.pirq.domid, info->u.pirq.pirq);
|
|
else if (rc) {
|
|
pr_warn("unmap irq failed %d\n", rc);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
xen_free_irq(irq);
|
|
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
return rc;
|
|
}
|
|
|
|
int xen_irq_from_pirq(unsigned pirq)
|
|
{
|
|
int irq;
|
|
|
|
struct irq_info *info;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
list_for_each_entry(info, &xen_irq_list_head, list) {
|
|
if (info->type != IRQT_PIRQ)
|
|
continue;
|
|
irq = info->irq;
|
|
if (info->u.pirq.pirq == pirq)
|
|
goto out;
|
|
}
|
|
irq = -1;
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
return irq;
|
|
}
|
|
|
|
|
|
int xen_pirq_from_irq(unsigned irq)
|
|
{
|
|
return pirq_from_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
|
|
int bind_evtchn_to_irq(unsigned int evtchn)
|
|
{
|
|
int irq;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = evtchn_to_irq[evtchn];
|
|
|
|
if (irq == -1) {
|
|
irq = xen_allocate_irq_dynamic();
|
|
if (irq < 0)
|
|
goto out;
|
|
|
|
irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
|
|
handle_edge_irq, "event");
|
|
|
|
xen_irq_info_evtchn_init(irq, evtchn);
|
|
} else {
|
|
struct irq_info *info = info_for_irq(irq);
|
|
WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
return irq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
|
|
|
|
static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
|
|
{
|
|
struct evtchn_bind_ipi bind_ipi;
|
|
int evtchn, irq;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = per_cpu(ipi_to_irq, cpu)[ipi];
|
|
|
|
if (irq == -1) {
|
|
irq = xen_allocate_irq_dynamic();
|
|
if (irq < 0)
|
|
goto out;
|
|
|
|
irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
|
|
handle_percpu_irq, "ipi");
|
|
|
|
bind_ipi.vcpu = cpu;
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
|
|
&bind_ipi) != 0)
|
|
BUG();
|
|
evtchn = bind_ipi.port;
|
|
|
|
xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
|
|
|
|
bind_evtchn_to_cpu(evtchn, cpu);
|
|
} else {
|
|
struct irq_info *info = info_for_irq(irq);
|
|
WARN_ON(info == NULL || info->type != IRQT_IPI);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
return irq;
|
|
}
|
|
|
|
static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
|
|
unsigned int remote_port)
|
|
{
|
|
struct evtchn_bind_interdomain bind_interdomain;
|
|
int err;
|
|
|
|
bind_interdomain.remote_dom = remote_domain;
|
|
bind_interdomain.remote_port = remote_port;
|
|
|
|
err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
|
|
&bind_interdomain);
|
|
|
|
return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
|
|
}
|
|
|
|
static int find_virq(unsigned int virq, unsigned int cpu)
|
|
{
|
|
struct evtchn_status status;
|
|
int port, rc = -ENOENT;
|
|
|
|
memset(&status, 0, sizeof(status));
|
|
for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
|
|
status.dom = DOMID_SELF;
|
|
status.port = port;
|
|
rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
|
|
if (rc < 0)
|
|
continue;
|
|
if (status.status != EVTCHNSTAT_virq)
|
|
continue;
|
|
if (status.u.virq == virq && status.vcpu == cpu) {
|
|
rc = port;
|
|
break;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
|
|
{
|
|
struct evtchn_bind_virq bind_virq;
|
|
int evtchn, irq, ret;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = per_cpu(virq_to_irq, cpu)[virq];
|
|
|
|
if (irq == -1) {
|
|
irq = xen_allocate_irq_dynamic();
|
|
if (irq < 0)
|
|
goto out;
|
|
|
|
irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
|
|
handle_percpu_irq, "virq");
|
|
|
|
bind_virq.virq = virq;
|
|
bind_virq.vcpu = cpu;
|
|
ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
|
|
&bind_virq);
|
|
if (ret == 0)
|
|
evtchn = bind_virq.port;
|
|
else {
|
|
if (ret == -EEXIST)
|
|
ret = find_virq(virq, cpu);
|
|
BUG_ON(ret < 0);
|
|
evtchn = ret;
|
|
}
|
|
|
|
xen_irq_info_virq_init(cpu, irq, evtchn, virq);
|
|
|
|
bind_evtchn_to_cpu(evtchn, cpu);
|
|
} else {
|
|
struct irq_info *info = info_for_irq(irq);
|
|
WARN_ON(info == NULL || info->type != IRQT_VIRQ);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
return irq;
|
|
}
|
|
|
|
static void unbind_from_irq(unsigned int irq)
|
|
{
|
|
struct evtchn_close close;
|
|
int evtchn = evtchn_from_irq(irq);
|
|
struct irq_info *info = irq_get_handler_data(irq);
|
|
|
|
if (WARN_ON(!info))
|
|
return;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
if (info->refcnt > 0) {
|
|
info->refcnt--;
|
|
if (info->refcnt != 0)
|
|
goto done;
|
|
}
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
close.port = evtchn;
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
|
|
BUG();
|
|
|
|
switch (type_from_irq(irq)) {
|
|
case IRQT_VIRQ:
|
|
per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
|
|
[virq_from_irq(irq)] = -1;
|
|
break;
|
|
case IRQT_IPI:
|
|
per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
|
|
[ipi_from_irq(irq)] = -1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Closed ports are implicitly re-bound to VCPU0. */
|
|
bind_evtchn_to_cpu(evtchn, 0);
|
|
|
|
evtchn_to_irq[evtchn] = -1;
|
|
}
|
|
|
|
BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
|
|
|
|
xen_free_irq(irq);
|
|
|
|
done:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
}
|
|
|
|
int bind_evtchn_to_irqhandler(unsigned int evtchn,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags,
|
|
const char *devname, void *dev_id)
|
|
{
|
|
int irq, retval;
|
|
|
|
irq = bind_evtchn_to_irq(evtchn);
|
|
if (irq < 0)
|
|
return irq;
|
|
retval = request_irq(irq, handler, irqflags, devname, dev_id);
|
|
if (retval != 0) {
|
|
unbind_from_irq(irq);
|
|
return retval;
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
|
|
|
|
int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
|
|
unsigned int remote_port,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags,
|
|
const char *devname,
|
|
void *dev_id)
|
|
{
|
|
int irq, retval;
|
|
|
|
irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
retval = request_irq(irq, handler, irqflags, devname, dev_id);
|
|
if (retval != 0) {
|
|
unbind_from_irq(irq);
|
|
return retval;
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler);
|
|
|
|
int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags, const char *devname, void *dev_id)
|
|
{
|
|
int irq, retval;
|
|
|
|
irq = bind_virq_to_irq(virq, cpu);
|
|
if (irq < 0)
|
|
return irq;
|
|
retval = request_irq(irq, handler, irqflags, devname, dev_id);
|
|
if (retval != 0) {
|
|
unbind_from_irq(irq);
|
|
return retval;
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler);
|
|
|
|
int bind_ipi_to_irqhandler(enum ipi_vector ipi,
|
|
unsigned int cpu,
|
|
irq_handler_t handler,
|
|
unsigned long irqflags,
|
|
const char *devname,
|
|
void *dev_id)
|
|
{
|
|
int irq, retval;
|
|
|
|
irq = bind_ipi_to_irq(ipi, cpu);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME;
|
|
retval = request_irq(irq, handler, irqflags, devname, dev_id);
|
|
if (retval != 0) {
|
|
unbind_from_irq(irq);
|
|
return retval;
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
|
|
void unbind_from_irqhandler(unsigned int irq, void *dev_id)
|
|
{
|
|
struct irq_info *info = irq_get_handler_data(irq);
|
|
|
|
if (WARN_ON(!info))
|
|
return;
|
|
free_irq(irq, dev_id);
|
|
unbind_from_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
|
|
|
|
int evtchn_make_refcounted(unsigned int evtchn)
|
|
{
|
|
int irq = evtchn_to_irq[evtchn];
|
|
struct irq_info *info;
|
|
|
|
if (irq == -1)
|
|
return -ENOENT;
|
|
|
|
info = irq_get_handler_data(irq);
|
|
|
|
if (!info)
|
|
return -ENOENT;
|
|
|
|
WARN_ON(info->refcnt != -1);
|
|
|
|
info->refcnt = 1;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
|
|
|
|
int evtchn_get(unsigned int evtchn)
|
|
{
|
|
int irq;
|
|
struct irq_info *info;
|
|
int err = -ENOENT;
|
|
|
|
if (evtchn >= NR_EVENT_CHANNELS)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
irq = evtchn_to_irq[evtchn];
|
|
if (irq == -1)
|
|
goto done;
|
|
|
|
info = irq_get_handler_data(irq);
|
|
|
|
if (!info)
|
|
goto done;
|
|
|
|
err = -EINVAL;
|
|
if (info->refcnt <= 0)
|
|
goto done;
|
|
|
|
info->refcnt++;
|
|
err = 0;
|
|
done:
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(evtchn_get);
|
|
|
|
void evtchn_put(unsigned int evtchn)
|
|
{
|
|
int irq = evtchn_to_irq[evtchn];
|
|
if (WARN_ON(irq == -1))
|
|
return;
|
|
unbind_from_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(evtchn_put);
|
|
|
|
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
|
|
{
|
|
int irq;
|
|
|
|
#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);
|
|
}
|
|
|
|
irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct shared_info *sh = HYPERVISOR_shared_info;
|
|
int cpu = smp_processor_id();
|
|
xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
|
|
int i;
|
|
unsigned long flags;
|
|
static DEFINE_SPINLOCK(debug_lock);
|
|
struct vcpu_info *v;
|
|
|
|
spin_lock_irqsave(&debug_lock, flags);
|
|
|
|
printk("\nvcpu %d\n ", cpu);
|
|
|
|
for_each_online_cpu(i) {
|
|
int pending;
|
|
v = per_cpu(xen_vcpu, i);
|
|
pending = (get_irq_regs() && i == cpu)
|
|
? xen_irqs_disabled(get_irq_regs())
|
|
: v->evtchn_upcall_mask;
|
|
printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i,
|
|
pending, v->evtchn_upcall_pending,
|
|
(int)(sizeof(v->evtchn_pending_sel)*2),
|
|
v->evtchn_pending_sel);
|
|
}
|
|
v = per_cpu(xen_vcpu, cpu);
|
|
|
|
printk("\npending:\n ");
|
|
for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
|
|
printk("%0*"PRI_xen_ulong"%s",
|
|
(int)sizeof(sh->evtchn_pending[0])*2,
|
|
sh->evtchn_pending[i],
|
|
i % 8 == 0 ? "\n " : " ");
|
|
printk("\nglobal mask:\n ");
|
|
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
|
|
printk("%0*"PRI_xen_ulong"%s",
|
|
(int)(sizeof(sh->evtchn_mask[0])*2),
|
|
sh->evtchn_mask[i],
|
|
i % 8 == 0 ? "\n " : " ");
|
|
|
|
printk("\nglobally unmasked:\n ");
|
|
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
|
|
printk("%0*"PRI_xen_ulong"%s",
|
|
(int)(sizeof(sh->evtchn_mask[0])*2),
|
|
sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
|
|
i % 8 == 0 ? "\n " : " ");
|
|
|
|
printk("\nlocal cpu%d mask:\n ", cpu);
|
|
for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
|
|
printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
|
|
cpu_evtchn[i],
|
|
i % 8 == 0 ? "\n " : " ");
|
|
|
|
printk("\nlocally unmasked:\n ");
|
|
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
|
|
xen_ulong_t pending = sh->evtchn_pending[i]
|
|
& ~sh->evtchn_mask[i]
|
|
& cpu_evtchn[i];
|
|
printk("%0*"PRI_xen_ulong"%s",
|
|
(int)(sizeof(sh->evtchn_mask[0])*2),
|
|
pending, i % 8 == 0 ? "\n " : " ");
|
|
}
|
|
|
|
printk("\npending list:\n");
|
|
for (i = 0; i < NR_EVENT_CHANNELS; i++) {
|
|
if (sync_test_bit(i, BM(sh->evtchn_pending))) {
|
|
int word_idx = i / BITS_PER_EVTCHN_WORD;
|
|
printk(" %d: event %d -> irq %d%s%s%s\n",
|
|
cpu_from_evtchn(i), i,
|
|
evtchn_to_irq[i],
|
|
sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
|
|
? "" : " l2-clear",
|
|
!sync_test_bit(i, BM(sh->evtchn_mask))
|
|
? "" : " globally-masked",
|
|
sync_test_bit(i, BM(cpu_evtchn))
|
|
? "" : " locally-masked");
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&debug_lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static DEFINE_PER_CPU(unsigned, xed_nesting_count);
|
|
static DEFINE_PER_CPU(unsigned int, current_word_idx);
|
|
static DEFINE_PER_CPU(unsigned int, current_bit_idx);
|
|
|
|
/*
|
|
* Mask out the i least significant bits of w
|
|
*/
|
|
#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
|
|
|
|
/*
|
|
* Search the CPUs pending events bitmasks. For each one found, map
|
|
* the event number to an irq, and feed it into do_IRQ() for
|
|
* handling.
|
|
*
|
|
* Xen uses a two-level bitmap to speed searching. The first level is
|
|
* a bitset of words which contain pending event bits. The second
|
|
* level is a bitset of pending events themselves.
|
|
*/
|
|
static void __xen_evtchn_do_upcall(void)
|
|
{
|
|
int start_word_idx, start_bit_idx;
|
|
int word_idx, bit_idx;
|
|
int i, irq;
|
|
int cpu = get_cpu();
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
|
|
unsigned count;
|
|
|
|
do {
|
|
xen_ulong_t pending_words;
|
|
xen_ulong_t pending_bits;
|
|
struct irq_desc *desc;
|
|
|
|
vcpu_info->evtchn_upcall_pending = 0;
|
|
|
|
if (__this_cpu_inc_return(xed_nesting_count) - 1)
|
|
goto out;
|
|
|
|
/*
|
|
* Master flag must be cleared /before/ clearing
|
|
* selector flag. xchg_xen_ulong must contain an
|
|
* appropriate barrier.
|
|
*/
|
|
if ((irq = per_cpu(virq_to_irq, cpu)[VIRQ_TIMER]) != -1) {
|
|
int evtchn = evtchn_from_irq(irq);
|
|
word_idx = evtchn / BITS_PER_LONG;
|
|
pending_bits = evtchn % BITS_PER_LONG;
|
|
if (active_evtchns(cpu, s, word_idx) & (1ULL << pending_bits)) {
|
|
desc = irq_to_desc(irq);
|
|
if (desc)
|
|
generic_handle_irq_desc(irq, desc);
|
|
}
|
|
}
|
|
|
|
pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
|
|
|
|
start_word_idx = __this_cpu_read(current_word_idx);
|
|
start_bit_idx = __this_cpu_read(current_bit_idx);
|
|
|
|
word_idx = start_word_idx;
|
|
|
|
for (i = 0; pending_words != 0; i++) {
|
|
xen_ulong_t words;
|
|
|
|
words = MASK_LSBS(pending_words, word_idx);
|
|
|
|
/*
|
|
* If we masked out all events, wrap to beginning.
|
|
*/
|
|
if (words == 0) {
|
|
word_idx = 0;
|
|
bit_idx = 0;
|
|
continue;
|
|
}
|
|
word_idx = EVTCHN_FIRST_BIT(words);
|
|
|
|
pending_bits = active_evtchns(cpu, s, word_idx);
|
|
bit_idx = 0; /* usually scan entire word from start */
|
|
/*
|
|
* We scan the starting word in two parts.
|
|
*
|
|
* 1st time: start in the middle, scanning the
|
|
* upper bits.
|
|
*
|
|
* 2nd time: scan the whole word (not just the
|
|
* parts skipped in the first pass) -- if an
|
|
* event in the previously scanned bits is
|
|
* pending again it would just be scanned on
|
|
* the next loop anyway.
|
|
*/
|
|
if (word_idx == start_word_idx) {
|
|
if (i == 0)
|
|
bit_idx = start_bit_idx;
|
|
}
|
|
|
|
do {
|
|
xen_ulong_t bits;
|
|
int port;
|
|
|
|
bits = MASK_LSBS(pending_bits, bit_idx);
|
|
|
|
/* If we masked out all events, move on. */
|
|
if (bits == 0)
|
|
break;
|
|
|
|
bit_idx = EVTCHN_FIRST_BIT(bits);
|
|
|
|
/* Process port. */
|
|
port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
|
|
irq = evtchn_to_irq[port];
|
|
|
|
if (irq != -1) {
|
|
desc = irq_to_desc(irq);
|
|
if (desc)
|
|
generic_handle_irq_desc(irq, desc);
|
|
}
|
|
|
|
bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
|
|
|
|
/* Next caller starts at last processed + 1 */
|
|
__this_cpu_write(current_word_idx,
|
|
bit_idx ? word_idx :
|
|
(word_idx+1) % BITS_PER_EVTCHN_WORD);
|
|
__this_cpu_write(current_bit_idx, bit_idx);
|
|
} while (bit_idx != 0);
|
|
|
|
/* Scan start_l1i twice; all others once. */
|
|
if ((word_idx != start_word_idx) || (i != 0))
|
|
pending_words &= ~(1UL << word_idx);
|
|
|
|
word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD;
|
|
}
|
|
|
|
BUG_ON(!irqs_disabled());
|
|
|
|
count = __this_cpu_read(xed_nesting_count);
|
|
__this_cpu_write(xed_nesting_count, 0);
|
|
} while (count != 1 || vcpu_info->evtchn_upcall_pending);
|
|
|
|
out:
|
|
|
|
put_cpu();
|
|
}
|
|
|
|
void xen_evtchn_do_upcall(struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
|
|
|
irq_enter();
|
|
#ifdef CONFIG_X86
|
|
exit_idle();
|
|
#endif
|
|
|
|
__xen_evtchn_do_upcall();
|
|
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
void xen_hvm_evtchn_do_upcall(void)
|
|
{
|
|
__xen_evtchn_do_upcall();
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
|
|
|
|
/* Rebind a new event channel to an existing irq. */
|
|
void rebind_evtchn_irq(int evtchn, int irq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
|
|
if (WARN_ON(!info))
|
|
return;
|
|
|
|
/* Make sure the irq is masked, since the new event channel
|
|
will also be masked. */
|
|
disable_irq(irq);
|
|
|
|
mutex_lock(&irq_mapping_update_lock);
|
|
|
|
/* After resume the irq<->evtchn mappings are all cleared out */
|
|
BUG_ON(evtchn_to_irq[evtchn] != -1);
|
|
/* Expect irq to have been bound before,
|
|
so there should be a proper type */
|
|
BUG_ON(info->type == IRQT_UNBOUND);
|
|
|
|
xen_irq_info_evtchn_init(irq, evtchn);
|
|
|
|
mutex_unlock(&irq_mapping_update_lock);
|
|
|
|
/* new event channels are always bound to cpu 0 */
|
|
irq_set_affinity(irq, cpumask_of(0));
|
|
|
|
/* Unmask the event channel. */
|
|
enable_irq(irq);
|
|
}
|
|
|
|
/* Rebind an evtchn so that it gets delivered to a specific cpu */
|
|
static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
|
|
{
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
struct evtchn_bind_vcpu bind_vcpu;
|
|
int evtchn = evtchn_from_irq(irq);
|
|
int masked;
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return -1;
|
|
|
|
/*
|
|
* Events delivered via platform PCI interrupts are always
|
|
* routed to vcpu 0 and hence cannot be rebound.
|
|
*/
|
|
if (xen_hvm_domain() && !xen_have_vector_callback)
|
|
return -1;
|
|
|
|
/* Send future instances of this interrupt to other vcpu. */
|
|
bind_vcpu.port = evtchn;
|
|
bind_vcpu.vcpu = tcpu;
|
|
|
|
/*
|
|
* Mask the event while changing the VCPU binding to prevent
|
|
* it being delivered on an unexpected VCPU.
|
|
*/
|
|
masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
|
|
|
|
/*
|
|
* 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(dest);
|
|
|
|
return rebind_irq_to_cpu(data->irq, tcpu);
|
|
}
|
|
|
|
int resend_irq_on_evtchn(unsigned int irq)
|
|
{
|
|
int masked, evtchn = evtchn_from_irq(irq);
|
|
struct shared_info *s = HYPERVISOR_shared_info;
|
|
|
|
if (!VALID_EVTCHN(evtchn))
|
|
return 1;
|
|
|
|
masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
|
|
sync_set_bit(evtchn, BM(s->evtchn_pending));
|
|
if (!masked)
|
|
unmask_evtchn(evtchn);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void enable_dynirq(struct irq_data *data)
|
|
{
|
|
int evtchn = evtchn_from_irq(data->irq);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
unmask_evtchn(evtchn);
|
|
}
|
|
|
|
static void disable_dynirq(struct irq_data *data)
|
|
{
|
|
int evtchn = evtchn_from_irq(data->irq);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
mask_evtchn(evtchn);
|
|
}
|
|
|
|
static void ack_dynirq(struct irq_data *data)
|
|
{
|
|
int evtchn = evtchn_from_irq(data->irq);
|
|
|
|
irq_move_irq(data);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
clear_evtchn(evtchn);
|
|
}
|
|
|
|
static void mask_ack_dynirq(struct irq_data *data)
|
|
{
|
|
disable_dynirq(data);
|
|
ack_dynirq(data);
|
|
}
|
|
|
|
static int retrigger_dynirq(struct irq_data *data)
|
|
{
|
|
int evtchn = evtchn_from_irq(data->irq);
|
|
struct shared_info *sh = HYPERVISOR_shared_info;
|
|
int ret = 0;
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
int masked;
|
|
|
|
masked = sync_test_and_set_bit(evtchn, BM(sh->evtchn_mask));
|
|
sync_set_bit(evtchn, BM(sh->evtchn_pending));
|
|
if (!masked)
|
|
unmask_evtchn(evtchn);
|
|
ret = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void restore_pirqs(void)
|
|
{
|
|
int pirq, rc, irq, gsi;
|
|
struct physdev_map_pirq map_irq;
|
|
struct irq_info *info;
|
|
|
|
list_for_each_entry(info, &xen_irq_list_head, list) {
|
|
if (info->type != IRQT_PIRQ)
|
|
continue;
|
|
|
|
pirq = info->u.pirq.pirq;
|
|
gsi = info->u.pirq.gsi;
|
|
irq = info->irq;
|
|
|
|
/* save/restore of PT devices doesn't work, so at this point the
|
|
* only devices present are GSI based emulated devices */
|
|
if (!gsi)
|
|
continue;
|
|
|
|
map_irq.domid = DOMID_SELF;
|
|
map_irq.type = MAP_PIRQ_TYPE_GSI;
|
|
map_irq.index = gsi;
|
|
map_irq.pirq = pirq;
|
|
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
|
|
if (rc) {
|
|
pr_warn("xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
|
|
gsi, irq, pirq, rc);
|
|
xen_free_irq(irq);
|
|
continue;
|
|
}
|
|
|
|
printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
|
|
|
|
__startup_pirq(irq);
|
|
}
|
|
}
|
|
|
|
static void restore_cpu_virqs(unsigned int cpu)
|
|
{
|
|
struct evtchn_bind_virq bind_virq;
|
|
int virq, irq, evtchn;
|
|
|
|
for (virq = 0; virq < NR_VIRQS; virq++) {
|
|
if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
|
|
continue;
|
|
|
|
BUG_ON(virq_from_irq(irq) != virq);
|
|
|
|
/* Get a new binding from Xen. */
|
|
bind_virq.virq = virq;
|
|
bind_virq.vcpu = cpu;
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
|
|
&bind_virq) != 0)
|
|
BUG();
|
|
evtchn = bind_virq.port;
|
|
|
|
/* Record the new mapping. */
|
|
xen_irq_info_virq_init(cpu, irq, evtchn, virq);
|
|
bind_evtchn_to_cpu(evtchn, cpu);
|
|
}
|
|
}
|
|
|
|
static void restore_cpu_ipis(unsigned int cpu)
|
|
{
|
|
struct evtchn_bind_ipi bind_ipi;
|
|
int ipi, irq, evtchn;
|
|
|
|
for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) {
|
|
if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
|
|
continue;
|
|
|
|
BUG_ON(ipi_from_irq(irq) != ipi);
|
|
|
|
/* Get a new binding from Xen. */
|
|
bind_ipi.vcpu = cpu;
|
|
if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
|
|
&bind_ipi) != 0)
|
|
BUG();
|
|
evtchn = bind_ipi.port;
|
|
|
|
/* Record the new mapping. */
|
|
xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
|
|
bind_evtchn_to_cpu(evtchn, cpu);
|
|
}
|
|
}
|
|
|
|
/* Clear an irq's pending state, in preparation for polling on it */
|
|
void xen_clear_irq_pending(int irq)
|
|
{
|
|
int evtchn = evtchn_from_irq(irq);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
clear_evtchn(evtchn);
|
|
}
|
|
EXPORT_SYMBOL(xen_clear_irq_pending);
|
|
void xen_set_irq_pending(int irq)
|
|
{
|
|
int evtchn = evtchn_from_irq(irq);
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
set_evtchn(evtchn);
|
|
}
|
|
|
|
bool xen_test_irq_pending(int irq)
|
|
{
|
|
int evtchn = evtchn_from_irq(irq);
|
|
bool ret = false;
|
|
|
|
if (VALID_EVTCHN(evtchn))
|
|
ret = test_evtchn(evtchn);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Poll waiting for an irq to become pending with timeout. In the usual case,
|
|
* the irq will be disabled so it won't deliver an interrupt. */
|
|
void xen_poll_irq_timeout(int irq, u64 timeout)
|
|
{
|
|
evtchn_port_t evtchn = evtchn_from_irq(irq);
|
|
|
|
if (VALID_EVTCHN(evtchn)) {
|
|
struct sched_poll poll;
|
|
|
|
poll.nr_ports = 1;
|
|
poll.timeout = timeout;
|
|
set_xen_guest_handle(poll.ports, &evtchn);
|
|
|
|
if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
|
|
BUG();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(xen_poll_irq_timeout);
|
|
/* Poll waiting for an irq to become pending. In the usual case, the
|
|
* irq will be disabled so it won't deliver an interrupt. */
|
|
void xen_poll_irq(int irq)
|
|
{
|
|
xen_poll_irq_timeout(irq, 0 /* no timeout */);
|
|
}
|
|
|
|
/* Check whether the IRQ line is shared with other guests. */
|
|
int xen_test_irq_shared(int irq)
|
|
{
|
|
struct irq_info *info = info_for_irq(irq);
|
|
struct physdev_irq_status_query irq_status;
|
|
|
|
if (WARN_ON(!info))
|
|
return -ENOENT;
|
|
|
|
irq_status.irq = info->u.pirq.pirq;
|
|
|
|
if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
|
|
return 0;
|
|
return !(irq_status.flags & XENIRQSTAT_shared);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_test_irq_shared);
|
|
|
|
void xen_irq_resume(void)
|
|
{
|
|
unsigned int cpu, evtchn;
|
|
struct irq_info *info;
|
|
|
|
init_evtchn_cpu_bindings();
|
|
|
|
/* New event-channel space is not 'live' yet. */
|
|
for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
|
|
mask_evtchn(evtchn);
|
|
|
|
/* No IRQ <-> event-channel mappings. */
|
|
list_for_each_entry(info, &xen_irq_list_head, list)
|
|
info->evtchn = 0; /* zap event-channel binding */
|
|
|
|
for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
|
|
evtchn_to_irq[evtchn] = -1;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
restore_cpu_virqs(cpu);
|
|
restore_cpu_ipis(cpu);
|
|
}
|
|
|
|
restore_pirqs();
|
|
}
|
|
|
|
static struct irq_chip xen_dynamic_chip __read_mostly = {
|
|
.name = "xen-dyn",
|
|
|
|
.irq_disable = disable_dynirq,
|
|
.irq_mask = disable_dynirq,
|
|
.irq_unmask = enable_dynirq,
|
|
|
|
.irq_ack = ack_dynirq,
|
|
.irq_mask_ack = mask_ack_dynirq,
|
|
|
|
.irq_set_affinity = set_affinity_irq,
|
|
.irq_retrigger = retrigger_dynirq,
|
|
};
|
|
|
|
static struct irq_chip xen_pirq_chip __read_mostly = {
|
|
.name = "xen-pirq",
|
|
|
|
.irq_startup = startup_pirq,
|
|
.irq_shutdown = shutdown_pirq,
|
|
.irq_enable = enable_pirq,
|
|
.irq_disable = disable_pirq,
|
|
|
|
.irq_mask = disable_dynirq,
|
|
.irq_unmask = enable_dynirq,
|
|
|
|
.irq_ack = eoi_pirq,
|
|
.irq_eoi = eoi_pirq,
|
|
.irq_mask_ack = mask_ack_pirq,
|
|
|
|
.irq_set_affinity = set_affinity_irq,
|
|
|
|
.irq_retrigger = retrigger_dynirq,
|
|
};
|
|
|
|
static struct irq_chip xen_percpu_chip __read_mostly = {
|
|
.name = "xen-percpu",
|
|
|
|
.irq_disable = disable_dynirq,
|
|
.irq_mask = disable_dynirq,
|
|
.irq_unmask = enable_dynirq,
|
|
|
|
.irq_ack = ack_dynirq,
|
|
};
|
|
|
|
int xen_set_callback_via(uint64_t via)
|
|
{
|
|
struct xen_hvm_param a;
|
|
a.domid = DOMID_SELF;
|
|
a.index = HVM_PARAM_CALLBACK_IRQ;
|
|
a.value = via;
|
|
return HYPERVISOR_hvm_op(HVMOP_set_param, &a);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_set_callback_via);
|
|
|
|
#ifdef CONFIG_XEN_PVHVM
|
|
/* Vector callbacks are better than PCI interrupts to receive event
|
|
* channel notifications because we can receive vector callbacks on any
|
|
* vcpu and we don't need PCI support or APIC interactions. */
|
|
void xen_callback_vector(void)
|
|
{
|
|
int rc;
|
|
uint64_t callback_via;
|
|
if (xen_have_vector_callback) {
|
|
callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
|
|
rc = xen_set_callback_via(callback_via);
|
|
if (rc) {
|
|
pr_err("Request for Xen HVM callback vector failed\n");
|
|
xen_have_vector_callback = 0;
|
|
return;
|
|
}
|
|
pr_info("Xen HVM callback vector for event delivery is enabled\n");
|
|
/* in the restore case the vector has already been allocated */
|
|
if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
|
|
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
|
|
xen_hvm_callback_vector);
|
|
}
|
|
}
|
|
#else
|
|
void xen_callback_vector(void) {}
|
|
#endif
|
|
|
|
void __init xen_init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
|
|
GFP_KERNEL);
|
|
BUG_ON(!evtchn_to_irq);
|
|
for (i = 0; i < NR_EVENT_CHANNELS; i++)
|
|
evtchn_to_irq[i] = -1;
|
|
|
|
init_evtchn_cpu_bindings();
|
|
|
|
/* No event channels are 'live' right now. */
|
|
for (i = 0; i < NR_EVENT_CHANNELS; i++)
|
|
mask_evtchn(i);
|
|
|
|
pirq_needs_eoi = pirq_needs_eoi_flag;
|
|
|
|
#ifdef CONFIG_X86
|
|
if (xen_hvm_domain()) {
|
|
xen_callback_vector();
|
|
native_init_IRQ();
|
|
/* pci_xen_hvm_init must be called after native_init_IRQ so that
|
|
* __acpi_register_gsi can point at the right function */
|
|
pci_xen_hvm_init();
|
|
} else {
|
|
int rc;
|
|
struct physdev_pirq_eoi_gmfn eoi_gmfn;
|
|
|
|
irq_ctx_init(smp_processor_id());
|
|
if (xen_initial_domain())
|
|
pci_xen_initial_domain();
|
|
|
|
pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
|
|
eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
|
|
if (rc != 0) {
|
|
free_page((unsigned long) pirq_eoi_map);
|
|
pirq_eoi_map = NULL;
|
|
} else
|
|
pirq_needs_eoi = pirq_check_eoi_map;
|
|
}
|
|
#endif
|
|
}
|