summaryrefslogtreecommitdiffstats
path: root/virt/kvm/arm/vgic/vgic-debug.c
blob: cc12fe9b2df3fbe0f38f5fe080b9678717a2116b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2016 Linaro
 * Author: Christoffer Dall <christoffer.dall@linaro.org>
 */

#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 nr_lpis;
	int dist_id;
	int vcpu_id;
	int intid;
	int lpi_idx;
	u32 *lpi_array;
};

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;

	if (iter->intid >= (iter->nr_spis + VGIC_NR_PRIVATE_IRQS)) {
		if (iter->lpi_idx < iter->nr_lpis)
			iter->intid = iter->lpi_array[iter->lpi_idx];
		iter->lpi_idx++;
	}
}

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;
	if (kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
		iter->nr_lpis = vgic_copy_lpi_list(kvm, NULL, &iter->lpi_array);
		if (iter->nr_lpis < 0)
			iter->nr_lpis = 0;
	}

	/* 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 >= (iter->nr_spis + VGIC_NR_PRIVATE_IRQS) &&
		iter->lpi_idx > iter->nr_lpis;
}

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->lpi_array);
	kfree(iter);
	kvm->arch.vgic.iter = NULL;
	mutex_unlock(&kvm->lock);
}

static void print_dist_state(struct seq_file *s, struct vgic_dist *dist)
{
	bool v3 = dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3;

	seq_printf(s, "Distributor\n");
	seq_printf(s, "===========\n");
	seq_printf(s, "vgic_model:\t%s\n", v3 ? "GICv3" : "GICv2");
	seq_printf(s, "nr_spis:\t%d\n", dist->nr_spis);
	if (v3)
		seq_printf(s, "nr_lpis:\t%d\n", dist->lpi_list_count);
	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");
	seq_printf(s, "G=group\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 PLAEHCG     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 if (irq->intid < VGIC_MAX_SPI)
		type = "SPI";
	else
		type = "LPI";

	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%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->group,
			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 = vgic_get_irq(kvm, vcpu, iter->intid);
	if (!irq) {
		seq_printf(s, "       LPI %4d freed\n", iter->intid);
		return 0;
	}

	raw_spin_lock_irqsave(&irq->irq_lock, flags);
	print_irq_state(s, irq, vcpu);
	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);

	vgic_put_irq(kvm, irq);
	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
};

void vgic_debug_init(struct kvm *kvm)
{
	debugfs_create_file("vgic-state", 0444, kvm->debugfs_dentry, kvm,
			    &vgic_debug_fops);
}

void vgic_debug_destroy(struct kvm *kvm)
{
}