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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 <[email protected]>
5  */
6
7 #ifndef __LINUX_IRQCHIP_ARM_GIC_V4_H
8 #define __LINUX_IRQCHIP_ARM_GIC_V4_H
9
10 struct 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 */
19 struct 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 */
40 struct 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  */
104 struct 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
112 enum 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
124 struct 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
141 int its_alloc_vcpu_irqs(struct its_vm *vm);
142 void its_free_vcpu_irqs(struct its_vm *vm);
143 int its_make_vpe_resident(struct its_vpe *vpe, bool g0en, bool g1en);
144 int its_make_vpe_non_resident(struct its_vpe *vpe, bool db);
145 int its_commit_vpe(struct its_vpe *vpe);
146 int its_invall_vpe(struct its_vpe *vpe);
147 int its_map_vlpi(int irq, struct its_vlpi_map *map);
148 int its_get_vlpi(int irq, struct its_vlpi_map *map);
149 int its_unmap_vlpi(int irq);
150 int its_prop_update_vlpi(int irq, u8 config, bool inv);
151 int its_prop_update_vsgi(int irq, u8 priority, bool group);
152
153 struct irq_domain_ops;
154 int its_init_v4(struct irq_domain *domain,
155                 const struct irq_domain_ops *vpe_ops,
156                 const struct irq_domain_ops *sgi_ops);
157
158 bool gic_cpuif_has_vsgi(void);
159
160 #endif
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