Release 4.7 virt/kvm/irqchip.c
/*
* irqchip.c: Common API for in kernel interrupt controllers
* Copyright (c) 2007, Intel Corporation.
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
* Copyright (c) 2013, Alexander Graf <agraf@suse.de>
*
* 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.
*
* This file is derived from virt/kvm/irq_comm.c.
*
* Authors:
* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
* Alexander Graf <agraf@suse.de>
*/
#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/srcu.h>
#include <linux/export.h>
#include <trace/events/kvm.h>
#include "irq.h"
int kvm_irq_map_gsi(struct kvm *kvm,
struct kvm_kernel_irq_routing_entry *entries, int gsi)
{
struct kvm_irq_routing_table *irq_rt;
struct kvm_kernel_irq_routing_entry *e;
int n = 0;
irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
lockdep_is_held(&kvm->irq_lock));
if (irq_rt && gsi < irq_rt->nr_rt_entries) {
hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
entries[n] = *e;
++n;
}
}
return n;
}
Contributors
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| paul mackerras | paul mackerras | 89 | 97.80% | 2 | 66.67% |
| paolo bonzini | paolo bonzini | 2 | 2.20% | 1 | 33.33% |
| Total | 91 | 100.00% | 3 | 100.00% |
int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
struct kvm_irq_routing_table *irq_rt;
irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
return irq_rt->chip[irqchip][pin];
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| paul mackerras | paul mackerras | 46 | 100.00% | 2 | 100.00% |
| Total | 46 | 100.00% | 2 | 100.00% |
int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
{
struct kvm_kernel_irq_routing_entry route;
if (!irqchip_in_kernel(kvm) || msi->flags != 0)
return -EINVAL;
route.msi.address_lo = msi->address_lo;
route.msi.address_hi = msi->address_hi;
route.msi.data = msi->data;
return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexander graf | alexander graf | 82 | 100.00% | 1 | 100.00% |
| Total | 82 | 100.00% | 1 | 100.00% |
/*
* 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,
bool line_status)
{
struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS];
int ret = -1, i, idx;
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.
*/
idx = srcu_read_lock(&kvm->irq_srcu);
i = kvm_irq_map_gsi(kvm, irq_set, irq);
srcu_read_unlock(&kvm->irq_srcu, idx);
while (i--) {
int r;
r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
line_status);
if (r < 0)
continue;
ret = r + ((ret < 0) ? 0 : ret);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexander graf | alexander graf | 114 | 81.43% | 1 | 25.00% |
| christian borntraeger | christian borntraeger | 20 | 14.29% | 1 | 25.00% |
| paul mackerras | paul mackerras | 6 | 4.29% | 2 | 50.00% |
| Total | 140 | 100.00% | 4 | 100.00% |
static void free_irq_routing_table(struct kvm_irq_routing_table *rt)
{
int i;
if (!rt)
return;
for (i = 0; i < rt->nr_rt_entries; ++i) {
struct kvm_kernel_irq_routing_entry *e;
struct hlist_node *n;
hlist_for_each_entry_safe(e, n, &rt->map[i], link) {
hlist_del(&e->link);
kfree(e);
}
}
kfree(rt);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| joerg roedel | joerg roedel | 77 | 100.00% | 1 | 100.00% |
| Total | 77 | 100.00% | 1 | 100.00% |
void kvm_free_irq_routing(struct kvm *kvm)
{
/* Called only during vm destruction. Nobody can use the pointer
at this stage */
struct kvm_irq_routing_table *rt = rcu_access_pointer(kvm->irq_routing);
free_irq_routing_table(rt);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexander graf | alexander graf | 17 | 60.71% | 1 | 50.00% |
| joerg roedel | joerg roedel | 11 | 39.29% | 1 | 50.00% |
| Total | 28 | 100.00% | 2 | 100.00% |
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;
struct kvm_kernel_irq_routing_entry *ei;
/*
* Do not allow GSI to be mapped to the same irqchip more than once.
* Allow only one to one mapping between GSI and non-irqchip routing.
*/
hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
if (ei->type != KVM_IRQ_ROUTING_IRQCHIP ||
ue->type != KVM_IRQ_ROUTING_IRQCHIP ||
ue->u.irqchip.irqchip == ei->irqchip.irqchip)
return r;
e->gsi = ue->gsi;
e->type = ue->type;
r = kvm_set_routing_entry(e, ue);
if (r)
goto out;
if (e->type == KVM_IRQ_ROUTING_IRQCHIP)
rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi;
hlist_add_head(&e->link, &rt->map[e->gsi]);
r = 0;
out:
return r;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexander graf | alexander graf | 127 | 78.40% | 1 | 33.33% |
| paul mackerras | paul mackerras | 30 | 18.52% | 1 | 33.33% |
| andrey smetanin | andrey smetanin | 5 | 3.09% | 1 | 33.33% |
| Total | 162 | 100.00% | 3 | 100.00% |
void __attribute__((weak)) kvm_arch_irq_routing_update(struct kvm *kvm)
{
}
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)),
GFP_KERNEL);
if (!new)
return -ENOMEM;
new->nr_rt_entries = nr_rt_entries;
for (i = 0; i < KVM_NR_IRQCHIPS; i++)
for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
new->chip[i][j] = -1;
for (i = 0; i < nr; ++i) {
struct kvm_kernel_irq_routing_entry *e;
r = -ENOMEM;
e = kzalloc(sizeof(*e), GFP_KERNEL);
if (!e)
goto out;
r = -EINVAL;
if (ue->flags) {
kfree(e);
goto out;
}
r = setup_routing_entry(new, e, ue);
if (r) {
kfree(e);
goto out;
}
++ue;
}
mutex_lock(&kvm->irq_lock);
old = kvm->irq_routing;
rcu_assign_pointer(kvm->irq_routing, new);
kvm_irq_routing_update(kvm);
kvm_arch_irq_routing_update(kvm);
mutex_unlock(&kvm->irq_lock);
kvm_arch_post_irq_routing_update(kvm);
synchronize_srcu_expedited(&kvm->irq_srcu);
new = old;
r = 0;
out:
free_irq_routing_table(new);
return r;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexander graf | alexander graf | 262 | 78.44% | 1 | 14.29% |
| joerg roedel | joerg roedel | 33 | 9.88% | 1 | 14.29% |
| sudip mukherjee | sudip mukherjee | 14 | 4.19% | 1 | 14.29% |
| paul mackerras | paul mackerras | 8 | 2.40% | 1 | 14.29% |
| christian borntraeger | christian borntraeger | 7 | 2.10% | 1 | 14.29% |
| andrey smetanin | andrey smetanin | 6 | 1.80% | 1 | 14.29% |
| steve rutherford | steve rutherford | 4 | 1.20% | 1 | 14.29% |
| Total | 334 | 100.00% | 7 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexander graf | alexander graf | 619 | 62.21% | 2 | 18.18% |
| paul mackerras | paul mackerras | 179 | 17.99% | 2 | 18.18% |
| joerg roedel | joerg roedel | 121 | 12.16% | 1 | 9.09% |
| christian borntraeger | christian borntraeger | 30 | 3.02% | 1 | 9.09% |
| andrey smetanin | andrey smetanin | 26 | 2.61% | 2 | 18.18% |
| sudip mukherjee | sudip mukherjee | 14 | 1.41% | 1 | 9.09% |
| steve rutherford | steve rutherford | 4 | 0.40% | 1 | 9.09% |
| paolo bonzini | paolo bonzini | 2 | 0.20% | 1 | 9.09% |
| Total | 995 | 100.00% | 11 | 100.00% |
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