linux-stable/virt/kvm/irq_comm.c

475 lines
12 KiB
C
Raw Normal View History

/*
* irq_comm.c: Common API for in kernel interrupt controller
* Copyright (c) 2007, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
* Authors:
* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*/
#include <linux/kvm_host.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <trace/events/kvm.h>
#include <asm/msidef.h>
#ifdef CONFIG_IA64
#include <asm/iosapic.h>
#endif
#include "irq.h"
#include "ioapic.h"
static inline int kvm_irq_line_state(unsigned long *irq_state,
int irq_source_id, int level)
{
/* Logical OR for level trig interrupt */
if (level)
set_bit(irq_source_id, irq_state);
else
clear_bit(irq_source_id, irq_state);
return !!(*irq_state);
}
static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level)
{
#ifdef CONFIG_X86
struct kvm_pic *pic = pic_irqchip(kvm);
level = kvm_irq_line_state(&pic->irq_states[e->irqchip.pin],
irq_source_id, level);
return kvm_pic_set_irq(pic, e->irqchip.pin, level);
#else
return -1;
#endif
}
static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
level = kvm_irq_line_state(&ioapic->irq_states[e->irqchip.pin],
irq_source_id, level);
return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, level);
}
inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
{
#ifdef CONFIG_IA64
return irq->delivery_mode ==
(IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
#else
return irq->delivery_mode == APIC_DM_LOWEST;
#endif
}
int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
struct kvm_lapic_irq *irq)
{
int i, r = -1;
struct kvm_vcpu *vcpu, *lowest = NULL;
if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
kvm_is_dm_lowest_prio(irq))
printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!kvm_apic_present(vcpu))
continue;
if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
irq->dest_id, irq->dest_mode))
continue;
if (!kvm_is_dm_lowest_prio(irq)) {
if (r < 0)
r = 0;
r += kvm_apic_set_irq(vcpu, irq);
} else if (kvm_lapic_enabled(vcpu)) {
if (!lowest)
lowest = vcpu;
else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
lowest = vcpu;
}
}
if (lowest)
r = kvm_apic_set_irq(lowest, irq);
return r;
}
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level)
{
struct kvm_lapic_irq irq;
if (!level)
return -1;
trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
irq.dest_id = (e->msi.address_lo &
MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
irq.vector = (e->msi.data &
MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
irq.delivery_mode = e->msi.data & 0x700;
irq.level = 1;
irq.shorthand = 0;
/* TODO Deal with RH bit of MSI message address */
return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
}
/*
* Return value:
* < 0 Interrupt was ignored (masked or not delivered for other reasons)
* = 0 Interrupt was coalesced (previous irq is still pending)
* > 0 Number of CPUs interrupt was delivered to
*/
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
{
struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
int ret = -1, i = 0;
struct kvm_irq_routing_table *irq_rt;
struct hlist_node *n;
trace_kvm_set_irq(irq, level, irq_source_id);
/* Not possible to detect if the guest uses the PIC or the
* IOAPIC. So set the bit in both. The guest will ignore
* writes to the unused one.
*/
rcu_read_lock();
irq_rt = rcu_dereference(kvm->irq_routing);
if (irq < irq_rt->nr_rt_entries)
hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
irq_set[i++] = *e;
rcu_read_unlock();
while(i--) {
int r;
r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
if (r < 0)
continue;
ret = r + ((ret < 0) ? 0 : ret);
}
return ret;
}
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
struct kvm_irq_ack_notifier *kian;
struct hlist_node *n;
int gsi;
trace_kvm_ack_irq(irqchip, pin);
rcu_read_lock();
gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
if (gsi != -1)
hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
link)
if (kian->gsi == gsi)
kian->irq_acked(kian);
rcu_read_unlock();
}
void kvm_register_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian)
{
mutex_lock(&kvm->irq_lock);
hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
mutex_unlock(&kvm->irq_lock);
}
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian)
{
mutex_lock(&kvm->irq_lock);
hlist_del_init_rcu(&kian->link);
mutex_unlock(&kvm->irq_lock);
synchronize_rcu();
}
int kvm_request_irq_source_id(struct kvm *kvm)
{
unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
int irq_source_id;
mutex_lock(&kvm->irq_lock);
irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG);
if (irq_source_id >= BITS_PER_LONG) {
printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n");
irq_source_id = -EFAULT;
goto unlock;
}
ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
set_bit(irq_source_id, bitmap);
unlock:
mutex_unlock(&kvm->irq_lock);
return irq_source_id;
}
void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
{
int i;
ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
mutex_lock(&kvm->irq_lock);
if (irq_source_id < 0 ||
irq_source_id >= BITS_PER_LONG) {
printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
goto unlock;
}
clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
if (!irqchip_in_kernel(kvm))
goto unlock;
for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) {
clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]);
if (i >= 16)
continue;
#ifdef CONFIG_X86
clear_bit(irq_source_id, &pic_irqchip(kvm)->irq_states[i]);
#endif
}
unlock:
mutex_unlock(&kvm->irq_lock);
}
void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
struct kvm_irq_mask_notifier *kimn)
{
mutex_lock(&kvm->irq_lock);
kimn->irq = irq;
hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list);
mutex_unlock(&kvm->irq_lock);
}
void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
struct kvm_irq_mask_notifier *kimn)
{
mutex_lock(&kvm->irq_lock);
hlist_del_rcu(&kimn->link);
mutex_unlock(&kvm->irq_lock);
synchronize_rcu();
}
void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
bool mask)
{
struct kvm_irq_mask_notifier *kimn;
struct hlist_node *n;
int gsi;
rcu_read_lock();
gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
if (gsi != -1)
hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link)
if (kimn->irq == gsi)
kimn->func(kimn, mask);
rcu_read_unlock();
}
void kvm_free_irq_routing(struct kvm *kvm)
{
/* Called only during vm destruction. Nobody can use the pointer
at this stage */
kfree(kvm->irq_routing);
}
static int setup_routing_entry(struct kvm_irq_routing_table *rt,
struct kvm_kernel_irq_routing_entry *e,
const struct kvm_irq_routing_entry *ue)
{
int r = -EINVAL;
int delta;
unsigned max_pin;
struct kvm_kernel_irq_routing_entry *ei;
struct hlist_node *n;
/*
* Do not allow GSI to be mapped to the same irqchip more than once.
* Allow only one to one mapping between GSI and MSI.
*/
hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link)
if (ei->type == KVM_IRQ_ROUTING_MSI ||
ue->u.irqchip.irqchip == ei->irqchip.irqchip)
return r;
e->gsi = ue->gsi;
e->type = ue->type;
switch (ue->type) {
case KVM_IRQ_ROUTING_IRQCHIP:
delta = 0;
switch (ue->u.irqchip.irqchip) {
case KVM_IRQCHIP_PIC_MASTER:
e->set = kvm_set_pic_irq;
max_pin = 16;
break;
case KVM_IRQCHIP_PIC_SLAVE:
e->set = kvm_set_pic_irq;
max_pin = 16;
delta = 8;
break;
case KVM_IRQCHIP_IOAPIC:
max_pin = KVM_IOAPIC_NUM_PINS;
e->set = kvm_set_ioapic_irq;
break;
default:
goto out;
}
e->irqchip.irqchip = ue->u.irqchip.irqchip;
e->irqchip.pin = ue->u.irqchip.pin + delta;
if (e->irqchip.pin >= max_pin)
goto out;
rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
break;
case KVM_IRQ_ROUTING_MSI:
e->set = kvm_set_msi;
e->msi.address_lo = ue->u.msi.address_lo;
e->msi.address_hi = ue->u.msi.address_hi;
e->msi.data = ue->u.msi.data;
break;
default:
goto out;
}
hlist_add_head(&e->link, &rt->map[e->gsi]);
r = 0;
out:
return r;
}
int kvm_set_irq_routing(struct kvm *kvm,
const struct kvm_irq_routing_entry *ue,
unsigned nr,
unsigned flags)
{
struct kvm_irq_routing_table *new, *old;
u32 i, j, nr_rt_entries = 0;
int r;
for (i = 0; i < nr; ++i) {
if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
return -EINVAL;
nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
}
nr_rt_entries += 1;
new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
+ (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
GFP_KERNEL);
if (!new)
return -ENOMEM;
new->rt_entries = (void *)&new->map[nr_rt_entries];
new->nr_rt_entries = nr_rt_entries;
for (i = 0; i < 3; i++)
for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
new->chip[i][j] = -1;
for (i = 0; i < nr; ++i) {
r = -EINVAL;
if (ue->flags)
goto out;
r = setup_routing_entry(new, &new->rt_entries[i], ue);
if (r)
goto out;
++ue;
}
mutex_lock(&kvm->irq_lock);
old = kvm->irq_routing;
kvm_irq_routing_update(kvm, new);
mutex_unlock(&kvm->irq_lock);
synchronize_rcu();
new = old;
r = 0;
out:
kfree(new);
return r;
}
#define IOAPIC_ROUTING_ENTRY(irq) \
{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
.u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) }
#define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq)
#ifdef CONFIG_X86
# define PIC_ROUTING_ENTRY(irq) \
{ .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \
.u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 }
# define ROUTING_ENTRY2(irq) \
IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq)
#else
# define ROUTING_ENTRY2(irq) \
IOAPIC_ROUTING_ENTRY(irq)
#endif
static const struct kvm_irq_routing_entry default_routing[] = {
ROUTING_ENTRY2(0), ROUTING_ENTRY2(1),
ROUTING_ENTRY2(2), ROUTING_ENTRY2(3),
ROUTING_ENTRY2(4), ROUTING_ENTRY2(5),
ROUTING_ENTRY2(6), ROUTING_ENTRY2(7),
ROUTING_ENTRY2(8), ROUTING_ENTRY2(9),
ROUTING_ENTRY2(10), ROUTING_ENTRY2(11),
ROUTING_ENTRY2(12), ROUTING_ENTRY2(13),
ROUTING_ENTRY2(14), ROUTING_ENTRY2(15),
ROUTING_ENTRY1(16), ROUTING_ENTRY1(17),
ROUTING_ENTRY1(18), ROUTING_ENTRY1(19),
ROUTING_ENTRY1(20), ROUTING_ENTRY1(21),
ROUTING_ENTRY1(22), ROUTING_ENTRY1(23),
#ifdef CONFIG_IA64
ROUTING_ENTRY1(24), ROUTING_ENTRY1(25),
ROUTING_ENTRY1(26), ROUTING_ENTRY1(27),
ROUTING_ENTRY1(28), ROUTING_ENTRY1(29),
ROUTING_ENTRY1(30), ROUTING_ENTRY1(31),
ROUTING_ENTRY1(32), ROUTING_ENTRY1(33),
ROUTING_ENTRY1(34), ROUTING_ENTRY1(35),
ROUTING_ENTRY1(36), ROUTING_ENTRY1(37),
ROUTING_ENTRY1(38), ROUTING_ENTRY1(39),
ROUTING_ENTRY1(40), ROUTING_ENTRY1(41),
ROUTING_ENTRY1(42), ROUTING_ENTRY1(43),
ROUTING_ENTRY1(44), ROUTING_ENTRY1(45),
ROUTING_ENTRY1(46), ROUTING_ENTRY1(47),
#endif
};
int kvm_setup_default_irq_routing(struct kvm *kvm)
{
return kvm_set_irq_routing(kvm, default_routing,
ARRAY_SIZE(default_routing), 0);
}