drivers/misc/ibmvmc.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * linux/drivers/misc/ibmvmc.h
   4  *
   5  * IBM Power Systems Virtual Management Channel Support.
   6  *
   7  * Copyright (c) 2004, 2018 IBM Corp.
   8  *   Dave Engebretsen engebret@us.ibm.com
   9  *   Steven Royer seroyer@linux.vnet.ibm.com
  10  *   Adam Reznechek adreznec@linux.vnet.ibm.com
  11  *   Bryant G. Ly <bryantly@linux.vnet.ibm.com>
  12  */
  13 #ifndef IBMVMC_H
  14 #define IBMVMC_H
  15
  16 #include <linux/types.h>
  17 #include <linux/cdev.h>
  18
  19 #include <asm/vio.h>
  20
  21 #define IBMVMC_PROTOCOL_VERSION    0x0101
  22
  23 #define MIN_BUF_POOL_SIZE 16
  24 #define MIN_HMCS          1
  25 #define MIN_MTU           4096
  26 #define MAX_BUF_POOL_SIZE 64
  27 #define MAX_HMCS          2
  28 #define MAX_MTU           (4 * 4096)
  29 #define DEFAULT_BUF_POOL_SIZE 32
  30 #define DEFAULT_HMCS          1
  31 #define DEFAULT_MTU           4096
  32 #define HMC_ID_LEN        32
  33
  34 #define VMC_INVALID_BUFFER_ID 0xFFFF
  35
  36 /* ioctl numbers */
  37 #define VMC_BASE             0xCC
  38 #define VMC_IOCTL_SETHMCID   _IOW(VMC_BASE, 0x00, unsigned char *)
  39 #define VMC_IOCTL_QUERY      _IOR(VMC_BASE, 0x01, struct ibmvmc_query_struct)
  40 #define VMC_IOCTL_REQUESTVMC _IOR(VMC_BASE, 0x02, u32)
  41
  42 #define VMC_MSG_CAP          0x01
  43 #define VMC_MSG_CAP_RESP     0x81
  44 #define VMC_MSG_OPEN         0x02
  45 #define VMC_MSG_OPEN_RESP    0x82
  46 #define VMC_MSG_CLOSE        0x03
  47 #define VMC_MSG_CLOSE_RESP   0x83
  48 #define VMC_MSG_ADD_BUF      0x04
  49 #define VMC_MSG_ADD_BUF_RESP 0x84
  50 #define VMC_MSG_REM_BUF      0x05
  51 #define VMC_MSG_REM_BUF_RESP 0x85
  52 #define VMC_MSG_SIGNAL       0x06
  53
  54 #define VMC_MSG_SUCCESS 0
  55 #define VMC_MSG_INVALID_HMC_INDEX 1
  56 #define VMC_MSG_INVALID_BUFFER_ID 2
  57 #define VMC_MSG_CLOSED_HMC        3
  58 #define VMC_MSG_INTERFACE_FAILURE 4
  59 #define VMC_MSG_NO_BUFFER         5
  60
  61 #define VMC_BUF_OWNER_ALPHA 0
  62 #define VMC_BUF_OWNER_HV    1
  63
  64 enum ibmvmc_states {
  65         ibmvmc_state_sched_reset  = -1,
  66         ibmvmc_state_initial      = 0,
  67         ibmvmc_state_crqinit      = 1,
  68         ibmvmc_state_capabilities = 2,
  69         ibmvmc_state_ready        = 3,
  70         ibmvmc_state_failed       = 4,
  71 };
  72
  73 enum ibmhmc_states {
  74         /* HMC connection not established */
  75         ibmhmc_state_free    = 0,
  76
  77         /* HMC connection established (open called) */
  78         ibmhmc_state_initial = 1,
  79
  80         /* open msg sent to HV, due to ioctl(1) call */
  81         ibmhmc_state_opening = 2,
  82
  83         /* HMC connection ready, open resp msg from HV */
  84         ibmhmc_state_ready   = 3,
  85
  86         /* HMC connection failure */
  87         ibmhmc_state_failed  = 4,
  88 };
  89
  90 struct ibmvmc_buffer {
  91         u8 valid;       /* 1 when DMA storage allocated to buffer          */
  92         u8 free;        /* 1 when buffer available for the Alpha Partition */
  93         u8 owner;
  94         u16 id;
  95         u32 size;
  96         u32 msg_len;
  97         dma_addr_t dma_addr_local;
  98         dma_addr_t dma_addr_remote;
  99         void *real_addr_local;
 100 };
 101
 102 struct ibmvmc_admin_crq_msg {
 103         u8 valid;       /* RPA Defined           */
 104         u8 type;        /* ibmvmc msg type       */
 105         u8 status;      /* Response msg status. Zero is success and on failure,
 106                          * either 1 - General Failure, or 2 - Invalid Version is
 107                          * returned.
 108                          */
 109         u8 rsvd[2];
 110         u8 max_hmc;     /* Max # of independent HMC connections supported */
 111         __be16 pool_size;       /* Maximum number of buffers supported per HMC
 112                                  * connection
 113                                  */
 114         __be32 max_mtu;         /* Maximum message size supported (bytes) */
 115         __be16 crq_size;        /* # of entries available in the CRQ for the
 116                                  * source partition. The target partition must
 117                                  * limit the number of outstanding messages to
 118                                  * one half or less.
 119                                  */
 120         __be16 version; /* Indicates the code level of the management partition
 121                          * or the hypervisor with the high-order byte
 122                          * indicating a major version and the low-order byte
 123                          * indicating a minor version.
 124                          */
 125 };
 126
 127 struct ibmvmc_crq_msg {
 128         u8 valid;     /* RPA Defined           */
 129         u8 type;      /* ibmvmc msg type       */
 130         u8 status;    /* Response msg status   */
 131         union {
 132                 u8 rsvd;  /* Reserved              */
 133                 u8 owner;
 134         } var1;
 135         u8 hmc_session; /* Session Identifier for the current VMC connection */
 136         u8 hmc_index;   /* A unique HMC Idx would be used if multiple management
 137                          * applications running concurrently were desired
 138                          */
 139         union {
 140                 __be16 rsvd;
 141                 __be16 buffer_id;
 142         } var2;
 143         __be32 rsvd;
 144         union {
 145                 __be32 rsvd;
 146                 __be32 lioba;
 147                 __be32 msg_len;
 148         } var3;
 149 };
 150
 151 /* an RPA command/response transport queue */
 152 struct crq_queue {
 153         struct ibmvmc_crq_msg *msgs;
 154         int size, cur;
 155         dma_addr_t msg_token;
 156         spinlock_t lock;
 157 };
 158
 159 /* VMC server adapter settings */
 160 struct crq_server_adapter {
 161         struct device *dev;
 162         struct crq_queue queue;
 163         u32 liobn;
 164         u32 riobn;
 165         struct tasklet_struct work_task;
 166         wait_queue_head_t reset_wait_queue;
 167         struct task_struct *reset_task;
 168 };
 169
 170 /* Driver wide settings */
 171 struct ibmvmc_struct {
 172         u32 state;
 173         u32 max_mtu;
 174         u32 max_buffer_pool_size;
 175         u32 max_hmc_index;
 176         struct crq_server_adapter *adapter;
 177         struct cdev cdev;
 178         u32 vmc_drc_index;
 179 };
 180
 181 struct ibmvmc_file_session;
 182
 183 /* Connection specific settings */
 184 struct ibmvmc_hmc {
 185         u8 session;
 186         u8 index;
 187         u32 state;
 188         struct crq_server_adapter *adapter;
 189         spinlock_t lock;
 190         unsigned char hmc_id[HMC_ID_LEN];
 191         struct ibmvmc_buffer buffer[MAX_BUF_POOL_SIZE];
 192         unsigned short queue_outbound_msgs[MAX_BUF_POOL_SIZE];
 193         int queue_head, queue_tail;
 194         struct ibmvmc_file_session *file_session;
 195 };
 196
 197 struct ibmvmc_file_session {
 198         struct file *file;
 199         struct ibmvmc_hmc *hmc;
 200         bool valid;
 201 };
 202
 203 struct ibmvmc_query_struct {
 204         int have_vmc;
 205         int state;
 206         int vmc_drc_index;
 207 };
 208
 209 #endif /* __IBMVMC_H */