blob: 4ffc0b5e610560c752c99de33d6f5857e7344773 [file] [log] [blame]
/*
* Copyright (C) 2016 Linaro
* Author: Christoffer Dall <christoffer.dall@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cpu.h>
#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/kvm_host.h>
#include <linux/seq_file.h>
#include <kvm/arm_vgic.h>
#include <asm/kvm_mmu.h>
#include "vgic.h"
/*
* Structure to control looping through the entire vgic state. We start at
* zero for each field and move upwards. So, if dist_id is 0 we print the
* distributor info. When dist_id is 1, we have already printed it and move
* on.
*
* When vcpu_id < nr_cpus we print the vcpu info until vcpu_id == nr_cpus and
* so on.
*/
struct vgic_state_iter {
int nr_cpus;
int nr_spis;
int dist_id;
int vcpu_id;
int intid;
};
static void iter_next(struct vgic_state_iter *iter)
{
if (iter->dist_id == 0) {
iter->dist_id++;
return;
}
iter->intid++;
if (iter->intid == VGIC_NR_PRIVATE_IRQS &&
++iter->vcpu_id < iter->nr_cpus)
iter->intid = 0;
}
static void iter_init(struct kvm *kvm, struct vgic_state_iter *iter,
loff_t pos)
{
int nr_cpus = atomic_read(&kvm->online_vcpus);
memset(iter, 0, sizeof(*iter));
iter->nr_cpus = nr_cpus;
iter->nr_spis = kvm->arch.vgic.nr_spis;
/* Fast forward to the right position if needed */
while (pos--)
iter_next(iter);
}
static bool end_of_vgic(struct vgic_state_iter *iter)
{
return iter->dist_id > 0 &&
iter->vcpu_id == iter->nr_cpus &&
(iter->intid - VGIC_NR_PRIVATE_IRQS) == iter->nr_spis;
}
static void *vgic_debug_start(struct seq_file *s, loff_t *pos)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter;
mutex_lock(&kvm->lock);
iter = kvm->arch.vgic.iter;
if (iter) {
iter = ERR_PTR(-EBUSY);
goto out;
}
iter = kmalloc(sizeof(*iter), GFP_KERNEL);
if (!iter) {
iter = ERR_PTR(-ENOMEM);
goto out;
}
iter_init(kvm, iter, *pos);
kvm->arch.vgic.iter = iter;
if (end_of_vgic(iter))
iter = NULL;
out:
mutex_unlock(&kvm->lock);
return iter;
}
static void *vgic_debug_next(struct seq_file *s, void *v, loff_t *pos)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter = kvm->arch.vgic.iter;
++*pos;
iter_next(iter);
if (end_of_vgic(iter))
iter = NULL;
return iter;
}
static void vgic_debug_stop(struct seq_file *s, void *v)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter;
/*
* If the seq file wasn't properly opened, there's nothing to clearn
* up.
*/
if (IS_ERR(v))
return;
mutex_lock(&kvm->lock);
iter = kvm->arch.vgic.iter;
kfree(iter);
kvm->arch.vgic.iter = NULL;
mutex_unlock(&kvm->lock);
}
static void print_dist_state(struct seq_file *s, struct vgic_dist *dist)
{
seq_printf(s, "Distributor\n");
seq_printf(s, "===========\n");
seq_printf(s, "vgic_model:\t%s\n",
(dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) ?
"GICv3" : "GICv2");
seq_printf(s, "nr_spis:\t%d\n", dist->nr_spis);
seq_printf(s, "enabled:\t%d\n", dist->enabled);
seq_printf(s, "\n");
seq_printf(s, "P=pending_latch, L=line_level, A=active\n");
seq_printf(s, "E=enabled, H=hw, C=config (level=1, edge=0)\n");
}
static void print_header(struct seq_file *s, struct vgic_irq *irq,
struct kvm_vcpu *vcpu)
{
int id = 0;
char *hdr = "SPI ";
if (vcpu) {
hdr = "VCPU";
id = vcpu->vcpu_id;
}
seq_printf(s, "\n");
seq_printf(s, "%s%2d TYP ID TGT_ID PLAEHC HWID TARGET SRC PRI VCPU_ID\n", hdr, id);
seq_printf(s, "---------------------------------------------------------------\n");
}
static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
struct kvm_vcpu *vcpu)
{
char *type;
if (irq->intid < VGIC_NR_SGIS)
type = "SGI";
else if (irq->intid < VGIC_NR_PRIVATE_IRQS)
type = "PPI";
else
type = "SPI";
if (irq->intid ==0 || irq->intid == VGIC_NR_PRIVATE_IRQS)
print_header(s, irq, vcpu);
seq_printf(s, " %s %4d "
" %2d "
"%d%d%d%d%d%d "
"%8d "
"%8x "
" %2x "
"%3d "
" %2d "
"\n",
type, irq->intid,
(irq->target_vcpu) ? irq->target_vcpu->vcpu_id : -1,
irq->pending_latch,
irq->line_level,
irq->active,
irq->enabled,
irq->hw,
irq->config == VGIC_CONFIG_LEVEL,
irq->hwintid,
irq->mpidr,
irq->source,
irq->priority,
(irq->vcpu) ? irq->vcpu->vcpu_id : -1);
}
static int vgic_debug_show(struct seq_file *s, void *v)
{
struct kvm *kvm = (struct kvm *)s->private;
struct vgic_state_iter *iter = (struct vgic_state_iter *)v;
struct vgic_irq *irq;
struct kvm_vcpu *vcpu = NULL;
unsigned long flags;
if (iter->dist_id == 0) {
print_dist_state(s, &kvm->arch.vgic);
return 0;
}
if (!kvm->arch.vgic.initialized)
return 0;
if (iter->vcpu_id < iter->nr_cpus) {
vcpu = kvm_get_vcpu(kvm, iter->vcpu_id);
irq = &vcpu->arch.vgic_cpu.private_irqs[iter->intid];
} else {
irq = &kvm->arch.vgic.spis[iter->intid - VGIC_NR_PRIVATE_IRQS];
}
spin_lock_irqsave(&irq->irq_lock, flags);
print_irq_state(s, irq, vcpu);
spin_unlock_irqrestore(&irq->irq_lock, flags);
return 0;
}
static const struct seq_operations vgic_debug_seq_ops = {
.start = vgic_debug_start,
.next = vgic_debug_next,
.stop = vgic_debug_stop,
.show = vgic_debug_show
};
static int debug_open(struct inode *inode, struct file *file)
{
int ret;
ret = seq_open(file, &vgic_debug_seq_ops);
if (!ret) {
struct seq_file *seq;
/* seq_open will have modified file->private_data */
seq = file->private_data;
seq->private = inode->i_private;
}
return ret;
};
static const struct file_operations vgic_debug_fops = {
.owner = THIS_MODULE,
.open = debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release
};
int vgic_debug_init(struct kvm *kvm)
{
if (!kvm->debugfs_dentry)
return -ENOENT;
if (!debugfs_create_file("vgic-state", 0444,
kvm->debugfs_dentry,
kvm,
&vgic_debug_fops))
return -ENOMEM;
return 0;
}
int vgic_debug_destroy(struct kvm *kvm)
{
return 0;
}