1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright 2020-21 IBM Corp.
4 */
5
6#ifndef _VAS_H
7#define _VAS_H
8#include <asm/vas.h>
9#include <linux/mutex.h>
10#include <linux/stringify.h>
11
12/*
13 * VAS window modify flags
14 */
15#define VAS_MOD_WIN_CLOSE PPC_BIT(0)
16#define VAS_MOD_WIN_JOBS_KILL PPC_BIT(1)
17#define VAS_MOD_WIN_DR PPC_BIT(3)
18#define VAS_MOD_WIN_PR PPC_BIT(4)
19#define VAS_MOD_WIN_SF PPC_BIT(5)
20#define VAS_MOD_WIN_TA PPC_BIT(6)
21#define VAS_MOD_WIN_FLAGS (VAS_MOD_WIN_JOBS_KILL | VAS_MOD_WIN_DR | \
22 VAS_MOD_WIN_PR | VAS_MOD_WIN_SF)
23
24#define VAS_WIN_ACTIVE 0x0
25#define VAS_WIN_CLOSED 0x1
26#define VAS_WIN_INACTIVE 0x2 /* Inactive due to HW failure */
27/* Process of being modified, deallocated, or quiesced */
28#define VAS_WIN_MOD_IN_PROCESS 0x3
29
30#define VAS_COPY_PASTE_USER_MODE 0x00000001
31#define VAS_COP_OP_USER_MODE 0x00000010
32
33#define VAS_GZIP_QOS_CAPABILITIES 0x56516F73477A6970
34#define VAS_GZIP_DEFAULT_CAPABILITIES 0x56446566477A6970
35
36enum vas_migrate_action {
37 VAS_SUSPEND,
38 VAS_RESUME,
39};
40
41/*
42 * Co-processor feature - GZIP QoS windows or GZIP default windows
43 */
44enum vas_cop_feat_type {
45 VAS_GZIP_QOS_FEAT_TYPE,
46 VAS_GZIP_DEF_FEAT_TYPE,
47 VAS_MAX_FEAT_TYPE,
48};
49
50/*
51 * Use to get feature specific capabilities from the
52 * hypervisor.
53 */
54struct hv_vas_cop_feat_caps {
55 __be64 descriptor;
56 u8 win_type; /* Default or QoS type */
57 u8 user_mode;
58 __be16 max_lpar_creds;
59 __be16 max_win_creds;
60 union {
61 __be16 reserved;
62 __be16 def_lpar_creds; /* Used for default capabilities */
63 };
64 __be16 target_lpar_creds;
65} __packed __aligned(0x1000);
66
67/*
68 * Feature specific (QoS or default) capabilities.
69 */
70struct vas_cop_feat_caps {
71 u64 descriptor;
72 u8 win_type; /* Default or QoS type */
73 u8 user_mode; /* User mode copy/paste or COP HCALL */
74 u16 max_lpar_creds; /* Max credits available in LPAR */
75 /* Max credits can be assigned per window */
76 u16 max_win_creds;
77 union {
78 u16 reserved; /* Used for QoS credit type */
79 u16 def_lpar_creds; /* Used for default credit type */
80 };
81 /* Total LPAR available credits. Can be different from max LPAR */
82 /* credits due to DLPAR operation */
83 atomic_t nr_total_credits; /* Total credits assigned to LPAR */
84 atomic_t nr_used_credits; /* Used credits so far */
85};
86
87/*
88 * Feature (QoS or Default) specific to store capabilities and
89 * the list of open windows.
90 */
91struct vas_caps {
92 struct vas_cop_feat_caps caps;
93 struct list_head list; /* List of open windows */
94 int nr_open_wins_progress; /* Number of open windows in */
95 /* progress. Used in migration */
96 int nr_close_wins; /* closed windows in the hypervisor for DLPAR */
97 int nr_open_windows; /* Number of successful open windows */
98 u8 feat; /* Feature type */
99};
100
101/*
102 * To get window information from the hypervisor.
103 */
104struct hv_vas_win_lpar {
105 __be16 version;
106 u8 win_type;
107 u8 status;
108 __be16 credits; /* No of credits assigned to this window */
109 __be16 reserved;
110 __be32 pid; /* LPAR Process ID */
111 __be32 tid; /* LPAR Thread ID */
112 __be64 win_addr; /* Paste address */
113 __be32 interrupt; /* Interrupt when NX request completes */
114 __be32 fault; /* Interrupt when NX sees fault */
115 /* Associativity Domain Identifiers as returned in */
116 /* H_HOME_NODE_ASSOCIATIVITY */
117 __be64 domain[6];
118 __be64 win_util; /* Number of bytes processed */
119} __packed __aligned(0x1000);
120
121struct pseries_vas_window {
122 struct vas_window vas_win;
123 u64 win_addr; /* Physical paste address */
124 u8 win_type; /* QoS or Default window */
125 u32 complete_irq; /* Completion interrupt */
126 u32 fault_irq; /* Fault interrupt */
127 u64 domain[6]; /* Associativity domain Ids */
128 /* this window is allocated */
129 u64 util;
130 u32 pid; /* PID associated with this window */
131
132 /* List of windows opened which is used for LPM */
133 struct list_head win_list;
134 u64 flags;
135 char *name;
136 int fault_virq;
137 atomic_t pending_faults; /* Number of pending faults */
138};
139
140int sysfs_add_vas_caps(struct vas_cop_feat_caps *caps);
141int vas_reconfig_capabilties(u8 type, int new_nr_creds);
142int __init sysfs_pseries_vas_init(struct vas_all_caps *vas_caps);
143
144#ifdef CONFIG_PPC_VAS
145int vas_migration_handler(int action);
146int pseries_vas_dlpar_cpu(void);
147#else
148static inline int vas_migration_handler(int action)
149{
150 return 0;
151}
152static inline int pseries_vas_dlpar_cpu(void)
153{
154 return 0;
155}
156#endif
157#endif /* _VAS_H */
158

source code of linux/arch/powerpc/platforms/pseries/vas.h