Commit | Line | Data |
---|---|---|
166c9775 EA |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * irqfd: Allows an fd to be used to inject an interrupt to the guest | |
12 | * Credit goes to Avi Kivity for the original idea. | |
13 | */ | |
14 | ||
15 | #ifndef __LINUX_KVM_IRQFD_H | |
16 | #define __LINUX_KVM_IRQFD_H | |
17 | ||
18 | #include <linux/kvm_host.h> | |
19 | #include <linux/poll.h> | |
20 | ||
21 | /* | |
22 | * Resampling irqfds are a special variety of irqfds used to emulate | |
23 | * level triggered interrupts. The interrupt is asserted on eventfd | |
24 | * trigger. On acknowledgment through the irq ack notifier, the | |
25 | * interrupt is de-asserted and userspace is notified through the | |
26 | * resamplefd. All resamplers on the same gsi are de-asserted | |
27 | * together, so we don't need to track the state of each individual | |
28 | * user. We can also therefore share the same irq source ID. | |
29 | */ | |
30 | struct kvm_kernel_irqfd_resampler { | |
31 | struct kvm *kvm; | |
32 | /* | |
33 | * List of resampling struct _irqfd objects sharing this gsi. | |
34 | * RCU list modified under kvm->irqfds.resampler_lock | |
35 | */ | |
36 | struct list_head list; | |
37 | struct kvm_irq_ack_notifier notifier; | |
38 | /* | |
39 | * Entry in list of kvm->irqfd.resampler_list. Use for sharing | |
40 | * resamplers among irqfds on the same gsi. | |
41 | * Accessed and modified under kvm->irqfds.resampler_lock | |
42 | */ | |
43 | struct list_head link; | |
44 | }; | |
45 | ||
46 | struct kvm_kernel_irqfd { | |
47 | /* Used for MSI fast-path */ | |
48 | struct kvm *kvm; | |
49 | wait_queue_t wait; | |
50 | /* Update side is protected by irqfds.lock */ | |
51 | struct kvm_kernel_irq_routing_entry irq_entry; | |
52 | seqcount_t irq_entry_sc; | |
53 | /* Used for level IRQ fast-path */ | |
54 | int gsi; | |
55 | struct work_struct inject; | |
56 | /* The resampler used by this irqfd (resampler-only) */ | |
57 | struct kvm_kernel_irqfd_resampler *resampler; | |
58 | /* Eventfd notified on resample (resampler-only) */ | |
59 | struct eventfd_ctx *resamplefd; | |
60 | /* Entry in list of irqfds for a resampler (resampler-only) */ | |
61 | struct list_head resampler_link; | |
62 | /* Used for setup/shutdown */ | |
63 | struct eventfd_ctx *eventfd; | |
64 | struct list_head list; | |
65 | poll_table pt; | |
66 | struct work_struct shutdown; | |
9016cfb5 EA |
67 | struct irq_bypass_consumer consumer; |
68 | struct irq_bypass_producer *producer; | |
166c9775 EA |
69 | }; |
70 | ||
71 | #endif /* __LINUX_KVM_IRQFD_H */ |