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KVM: arm/arm64: vgic: Add debugfs vgic-state file
Add a file to debugfs to read the in-kernel state of the vgic. We don't do any locking of the entire VGIC state while traversing all the IRQs, so if the VM is running the user/developer may not see a quiesced state, but should take care to pause the VM using facilities in user space for that purpose. We also don't support LPIs yet, but they can be added easily if needed. Reviewed-by: Eric Auger <[email protected]> Tested-by: Eric Auger <[email protected]> Tested-by: Andre Przywara <[email protected]> Acked-by: Marc Zyngier <[email protected]> Signed-off-by: Christoffer Dall <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,283 @@ | ||
| /* | ||
| * Copyright (C) 2016 Linaro | ||
| * Author: Christoffer Dall <[email protected]> | ||
| * | ||
| * 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; | ||
|
|
||
| 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(&irq->irq_lock); | ||
| print_irq_state(s, irq, vcpu); | ||
| spin_unlock(&irq->irq_lock); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static 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 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; | ||
| } |
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