platforms/pseries/vas.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Copyright 2020-21 IBM Corp.
0004  */
0005
0006 #ifndef _VAS_H
0007 #define _VAS_H
0008 #include <asm/vas.h>
0009 #include <linux/mutex.h>
0010 #include <linux/stringify.h>
0011
0012 /*
0013  * VAS window modify flags
0014  */
0015 #define VAS_MOD_WIN_CLOSE   PPC_BIT(0)
0016 #define VAS_MOD_WIN_JOBS_KILL   PPC_BIT(1)
0017 #define VAS_MOD_WIN_DR      PPC_BIT(3)
0018 #define VAS_MOD_WIN_PR      PPC_BIT(4)
0019 #define VAS_MOD_WIN_SF      PPC_BIT(5)
0020 #define VAS_MOD_WIN_TA      PPC_BIT(6)
0021 #define VAS_MOD_WIN_FLAGS   (VAS_MOD_WIN_JOBS_KILL | VAS_MOD_WIN_DR | \
0022                 VAS_MOD_WIN_PR | VAS_MOD_WIN_SF)
0023
0024 #define VAS_WIN_ACTIVE      0x0
0025 #define VAS_WIN_CLOSED      0x1
0026 #define VAS_WIN_INACTIVE    0x2 /* Inactive due to HW failure */
0027 /* Process of being modified, deallocated, or quiesced */
0028 #define VAS_WIN_MOD_IN_PROCESS  0x3
0029
0030 #define VAS_COPY_PASTE_USER_MODE    0x00000001
0031 #define VAS_COP_OP_USER_MODE        0x00000010
0032
0033 #define VAS_GZIP_QOS_CAPABILITIES   0x56516F73477A6970
0034 #define VAS_GZIP_DEFAULT_CAPABILITIES   0x56446566477A6970
0035
0036 enum vas_migrate_action {
0037     VAS_SUSPEND,
0038     VAS_RESUME,
0039 };
0040
0041 /*
0042  * Co-processor feature - GZIP QoS windows or GZIP default windows
0043  */
0044 enum vas_cop_feat_type {
0045     VAS_GZIP_QOS_FEAT_TYPE,
0046     VAS_GZIP_DEF_FEAT_TYPE,
0047     VAS_MAX_FEAT_TYPE,
0048 };
0049
0050 /*
0051  * Use to get feature specific capabilities from the
0052  * hypervisor.
0053  */
0054 struct hv_vas_cop_feat_caps {
0055     __be64  descriptor;
0056     u8  win_type;       /* Default or QoS type */
0057     u8  user_mode;
0058     __be16  max_lpar_creds;
0059     __be16  max_win_creds;
0060     union {
0061         __be16  reserved;
0062         __be16  def_lpar_creds; /* Used for default capabilities */
0063     };
0064     __be16  target_lpar_creds;
0065 } __packed __aligned(0x1000);
0066
0067 /*
0068  * Feature specific (QoS or default) capabilities.
0069  */
0070 struct vas_cop_feat_caps {
0071     u64     descriptor;
0072     u8      win_type;   /* Default or QoS type */
0073     u8      user_mode;  /* User mode copy/paste or COP HCALL */
0074     u16     max_lpar_creds; /* Max credits available in LPAR */
0075     /* Max credits can be assigned per window */
0076     u16     max_win_creds;
0077     union {
0078         u16 reserved;   /* Used for QoS credit type */
0079         u16 def_lpar_creds; /* Used for default credit type */
0080     };
0081     /* Total LPAR available credits. Can be different from max LPAR */
0082     /* credits due to DLPAR operation */
0083     atomic_t    nr_total_credits;   /* Total credits assigned to LPAR */
0084     atomic_t    nr_used_credits;    /* Used credits so far */
0085 };
0086
0087 /*
0088  * Feature (QoS or Default) specific to store capabilities and
0089  * the list of open windows.
0090  */
0091 struct vas_caps {
0092     struct vas_cop_feat_caps caps;
0093     struct list_head list;  /* List of open windows */
0094     int nr_close_wins;  /* closed windows in the hypervisor for DLPAR */
0095     int nr_open_windows;    /* Number of successful open windows */
0096     u8 feat;        /* Feature type */
0097 };
0098
0099 /*
0100  * To get window information from the hypervisor.
0101  */
0102 struct hv_vas_win_lpar {
0103     __be16  version;
0104     u8  win_type;
0105     u8  status;
0106     __be16  credits;    /* No of credits assigned to this window */
0107     __be16  reserved;
0108     __be32  pid;        /* LPAR Process ID */
0109     __be32  tid;        /* LPAR Thread ID */
0110     __be64  win_addr;   /* Paste address */
0111     __be32  interrupt;  /* Interrupt when NX request completes */
0112     __be32  fault;      /* Interrupt when NX sees fault */
0113     /* Associativity Domain Identifiers as returned in */
0114     /* H_HOME_NODE_ASSOCIATIVITY */
0115     __be64  domain[6];
0116     __be64  win_util;   /* Number of bytes processed */
0117 } __packed __aligned(0x1000);
0118
0119 struct pseries_vas_window {
0120     struct vas_window vas_win;
0121     u64 win_addr;       /* Physical paste address */
0122     u8 win_type;        /* QoS or Default window */
0123     u32 complete_irq;   /* Completion interrupt */
0124     u32 fault_irq;      /* Fault interrupt */
0125     u64 domain[6];      /* Associativity domain Ids */
0126                 /* this window is allocated */
0127     u64 util;
0128     u32 pid;        /* PID associated with this window */
0129
0130     /* List of windows opened which is used for LPM */
0131     struct list_head win_list;
0132     u64 flags;
0133     char *name;
0134     int fault_virq;
0135 };
0136
0137 int sysfs_add_vas_caps(struct vas_cop_feat_caps *caps);
0138 int vas_reconfig_capabilties(u8 type, int new_nr_creds);
0139 int __init sysfs_pseries_vas_init(struct vas_all_caps *vas_caps);
0140
0141 #ifdef CONFIG_PPC_VAS
0142 int vas_migration_handler(int action);
0143 #else
0144 static inline int vas_migration_handler(int action)
0145 {
0146     return 0;
0147 }
0148 #endif
0149 #endif /* _VAS_H */