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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2016,2017 ARM Limited, All Rights Reserved.
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 */
6
7#ifndef __LINUX_IRQCHIP_ARM_GIC_V4_H
8#define __LINUX_IRQCHIP_ARM_GIC_V4_H
9
10struct its_vpe;
11
12/*
13 * Maximum number of ITTs when GITS_TYPER.VMOVP == 0, using the
14 * ITSList mechanism to perform inter-ITS synchronization.
15 */
16#define GICv4_ITS_LIST_MAX 16
17
18/* Embedded in kvm.arch */
19struct its_vm {
20 struct fwnode_handle *fwnode;
21 struct irq_domain *domain;
22 struct page *vprop_page;
23 struct its_vpe **vpes;
24 int nr_vpes;
25 irq_hw_number_t db_lpi_base;
26 unsigned long *db_bitmap;
27 int nr_db_lpis;
28 /*
29 * Ensures mutual exclusion between updates to vlpi_count[]
30 * and map/unmap when using the ITSList mechanism.
31 *
32 * The lock order for any sequence involving the ITSList is
33 * vmapp_lock -> vpe_lock ->vmovp_lock.
34 */
35 raw_spinlock_t vmapp_lock;
36 u32 vlpi_count[GICv4_ITS_LIST_MAX];
37};
38
39/* Embedded in kvm_vcpu.arch */
40struct its_vpe {
41 struct page *vpt_page;
42 struct its_vm *its_vm;
43 /* per-vPE VLPI tracking */
44 atomic_t vlpi_count;
45 /* Doorbell interrupt */
46 int irq;
47 irq_hw_number_t vpe_db_lpi;
48 /* VPE resident */
49 bool resident;
50 /* VPT parse complete */
51 bool ready;
52 union {
53 /* GICv4.0 implementations */
54 struct {
55 /* VPE proxy mapping */
56 int vpe_proxy_event;
57 /* Implementation Defined Area Invalid */
58 bool idai;
59 };
60 /* GICv4.1 implementations */
61 struct {
62 struct fwnode_handle *fwnode;
63 struct irq_domain *sgi_domain;
64 struct {
65 u8 priority;
66 bool enabled;
67 bool group;
68 } sgi_config[16];
69 };
70 };
71
72 /* Track the VPE being mapped */
73 atomic_t vmapp_count;
74
75 /*
76 * Ensures mutual exclusion between affinity setting of the
77 * vPE and vLPI operations using vpe->col_idx.
78 */
79 raw_spinlock_t vpe_lock;
80 /*
81 * This collection ID is used to indirect the target
82 * redistributor for this VPE. The ID itself isn't involved in
83 * programming of the ITS.
84 */
85 u16 col_idx;
86 /* Unique (system-wide) VPE identifier */
87 u16 vpe_id;
88 /* Pending VLPIs on schedule out? */
89 bool pending_last;
90};
91
92/*
93 * struct its_vlpi_map: structure describing the mapping of a
94 * VLPI. Only to be interpreted in the context of a physical interrupt
95 * it complements. To be used as the vcpu_info passed to
96 * irq_set_vcpu_affinity().
97 *
98 * @vm: Pointer to the GICv4 notion of a VM
99 * @vpe: Pointer to the GICv4 notion of a virtual CPU (VPE)
100 * @vintid: Virtual LPI number
101 * @properties: Priority and enable bits (as written in the prop table)
102 * @db_enabled: Is the VPE doorbell to be generated?
103 */
104struct its_vlpi_map {
105 struct its_vm *vm;
106 struct its_vpe *vpe;
107 u32 vintid;
108 u8 properties;
109 bool db_enabled;
110};
111
112enum its_vcpu_info_cmd_type {
113 MAP_VLPI,
114 GET_VLPI,
115 PROP_UPDATE_VLPI,
116 PROP_UPDATE_AND_INV_VLPI,
117 SCHEDULE_VPE,
118 DESCHEDULE_VPE,
119 COMMIT_VPE,
120 INVALL_VPE,
121 PROP_UPDATE_VSGI,
122};
123
124struct its_cmd_info {
125 enum its_vcpu_info_cmd_type cmd_type;
126 union {
127 struct its_vlpi_map *map;
128 u8 config;
129 bool req_db;
130 struct {
131 bool g0en;
132 bool g1en;
133 };
134 struct {
135 u8 priority;
136 bool group;
137 };
138 };
139};
140
141int its_alloc_vcpu_irqs(struct its_vm *vm);
142void its_free_vcpu_irqs(struct its_vm *vm);
143int its_make_vpe_resident(struct its_vpe *vpe, bool g0en, bool g1en);
144int its_make_vpe_non_resident(struct its_vpe *vpe, bool db);
145int its_commit_vpe(struct its_vpe *vpe);
146int its_invall_vpe(struct its_vpe *vpe);
147int its_map_vlpi(int irq, struct its_vlpi_map *map);
148int its_get_vlpi(int irq, struct its_vlpi_map *map);
149void its_unmap_vlpi(int irq);
150int its_prop_update_vlpi(int irq, u8 config, bool inv);
151int its_prop_update_vsgi(int irq, u8 priority, bool group);
152
153struct irq_domain_ops;
154int its_init_v4(struct irq_domain *domain,
155 const struct irq_domain_ops *vpe_ops,
156 const struct irq_domain_ops *sgi_ops);
157
158bool gic_cpuif_has_vsgi(void);
159
160#endif