include/linux/ipmi_smi.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * ipmi_smi.h
   4  *
   5  * MontaVista IPMI system management interface
   6  *
   7  * Author: MontaVista Software, Inc.
   8  *         Corey Minyard <minyard@mvista.com>
   9  *         source@mvista.com
  10  *
  11  * Copyright 2002 MontaVista Software Inc.
  12  *
  13  */
  14
  15 #ifndef __LINUX_IPMI_SMI_H
  16 #define __LINUX_IPMI_SMI_H
  17
  18 #include <linux/ipmi_msgdefs.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/ipmi.h>
  22
  23 struct device;
  24
  25 /*
  26  * This files describes the interface for IPMI system management interface
  27  * drivers to bind into the IPMI message handler.
  28  */
  29
  30 /* Structure for the low-level drivers. */
  31 struct ipmi_smi;
  32
  33 /*
  34  * Flags for set_check_watch() below.  Tells if the SMI should be
  35  * waiting for watchdog timeouts, commands and/or messages.
  36  */
  37 #define IPMI_WATCH_MASK_CHECK_MESSAGES  (1 << 0)
  38 #define IPMI_WATCH_MASK_CHECK_WATCHDOG  (1 << 1)
  39 #define IPMI_WATCH_MASK_CHECK_COMMANDS  (1 << 2)
  40
  41 /*
  42  * SMI messages
  43  *
  44  * When communicating with an SMI, messages come in two formats:
  45  *
  46  * * Normal (to a BMC over a BMC interface)
  47  *
  48  * * IPMB (over a IPMB to another MC)
  49  *
  50  * When normal, commands are sent using the format defined by a
  51  * standard message over KCS (NetFn must be even):
  52  *
  53  *   +-----------+-----+------+
  54  *   | NetFn/LUN | Cmd | Data |
  55  *   +-----------+-----+------+
  56  *
  57  * And responses, similarly, with an completion code added (NetFn must
  58  * be odd):
  59  *
  60  *   +-----------+-----+------+------+
  61  *   | NetFn/LUN | Cmd | CC   | Data |
  62  *   +-----------+-----+------+------+
  63  *
  64  * With normal messages, only commands are sent and only responses are
  65  * received.
  66  *
  67  * In IPMB mode, we are acting as an IPMB device. Commands will be in
  68  * the following format (NetFn must be even):
  69  *
  70  *   +-------------+------+-------------+-----+------+
  71  *   | NetFn/rsLUN | Addr | rqSeq/rqLUN | Cmd | Data |
  72  *   +-------------+------+-------------+-----+------+
  73  *
  74  * Responses will using the following format:
  75  *
  76  *   +-------------+------+-------------+-----+------+------+
  77  *   | NetFn/rqLUN | Addr | rqSeq/rsLUN | Cmd | CC   | Data |
  78  *   +-------------+------+-------------+-----+------+------+
  79  *
  80  * This is similar to the format defined in the IPMB manual section
  81  * 2.11.1 with the checksums and the first address removed.  Also, the
  82  * address is always the remote address.
  83  *
  84  * IPMB messages can be commands and responses in both directions.
  85  * Received commands are handled as received commands from the message
  86  * queue.
  87  */
  88
  89 enum ipmi_smi_msg_type {
  90         IPMI_SMI_MSG_TYPE_NORMAL = 0,
  91         IPMI_SMI_MSG_TYPE_IPMB_DIRECT
  92 };
  93
  94 /*
  95  * Messages to/from the lower layer.  The smi interface will take one
  96  * of these to send. After the send has occurred and a response has
  97  * been received, it will report this same data structure back up to
  98  * the upper layer.  If an error occurs, it should fill in the
  99  * response with an error code in the completion code location. When
 100  * asynchronous data is received, one of these is allocated, the
 101  * data_size is set to zero and the response holds the data from the
 102  * get message or get event command that the interface initiated.
 103  * Note that it is the interfaces responsibility to detect
 104  * asynchronous data and messages and request them from the
 105  * interface.
 106  */
 107 struct ipmi_smi_msg {
 108         struct list_head link;
 109
 110         enum ipmi_smi_msg_type type;
 111
 112         long    msgid;
 113         void    *user_data;
 114
 115         int           data_size;
 116         unsigned char data[IPMI_MAX_MSG_LENGTH];
 117
 118         int           rsp_size;
 119         unsigned char rsp[IPMI_MAX_MSG_LENGTH];
 120
 121         /*
 122          * Will be called when the system is done with the message
 123          * (presumably to free it).
 124          */
 125         void (*done)(struct ipmi_smi_msg *msg);
 126 };
 127
 128 #define INIT_IPMI_SMI_MSG(done_handler) \
 129 {                                               \
 130         .done = done_handler,                   \
 131         .type = IPMI_SMI_MSG_TYPE_NORMAL        \
 132 }
 133
 134 struct ipmi_smi_handlers {
 135         struct module *owner;
 136
 137         /* Capabilities of the SMI. */
 138 #define IPMI_SMI_CAN_HANDLE_IPMB_DIRECT         (1 << 0)
 139         unsigned int flags;
 140
 141         /*
 142          * The low-level interface cannot start sending messages to
 143          * the upper layer until this function is called.  This may
 144          * not be NULL, the lower layer must take the interface from
 145          * this call.
 146          */
 147         int (*start_processing)(void            *send_info,
 148                                 struct ipmi_smi *new_intf);
 149
 150         /*
 151          * When called, the low-level interface should disable all
 152          * processing, it should be complete shut down when it returns.
 153          */
 154         void (*shutdown)(void *send_info);
 155
 156         /*
 157          * Get the detailed private info of the low level interface and store
 158          * it into the structure of ipmi_smi_data. For example: the
 159          * ACPI device handle will be returned for the pnp_acpi IPMI device.
 160          */
 161         int (*get_smi_info)(void *send_info, struct ipmi_smi_info *data);
 162
 163         /*
 164          * Called to enqueue an SMI message to be sent.  This
 165          * operation is not allowed to fail.  If an error occurs, it
 166          * should report back the error in a received message.  It may
 167          * do this in the current call context, since no write locks
 168          * are held when this is run.  Message are delivered one at
 169          * a time by the message handler, a new message will not be
 170          * delivered until the previous message is returned.
 171          */
 172         void (*sender)(void                *send_info,
 173                        struct ipmi_smi_msg *msg);
 174
 175         /*
 176          * Called by the upper layer to request that we try to get
 177          * events from the BMC we are attached to.
 178          */
 179         void (*request_events)(void *send_info);
 180
 181         /*
 182          * Called by the upper layer when some user requires that the
 183          * interface watch for received messages and watchdog
 184          * pretimeouts (basically do a "Get Flags", or not.  Used by
 185          * the SMI to know if it should watch for these.  This may be
 186          * NULL if the SMI does not implement it.  watch_mask is from
 187          * IPMI_WATCH_MASK_xxx above.  The interface should run slower
 188          * timeouts for just watchdog checking or faster timeouts when
 189          * waiting for the message queue.
 190          */
 191         void (*set_need_watch)(void *send_info, unsigned int watch_mask);
 192
 193         /*
 194          * Called when flushing all pending messages.
 195          */
 196         void (*flush_messages)(void *send_info);
 197
 198         /*
 199          * Called when the interface should go into "run to
 200          * completion" mode.  If this call sets the value to true, the
 201          * interface should make sure that all messages are flushed
 202          * out and that none are pending, and any new requests are run
 203          * to completion immediately.
 204          */
 205         void (*set_run_to_completion)(void *send_info, bool run_to_completion);
 206
 207         /*
 208          * Called to poll for work to do.  This is so upper layers can
 209          * poll for operations during things like crash dumps.
 210          */
 211         void (*poll)(void *send_info);
 212
 213         /*
 214          * Enable/disable firmware maintenance mode.  Note that this
 215          * is *not* the modes defined, this is simply an on/off
 216          * setting.  The message handler does the mode handling.  Note
 217          * that this is called from interrupt context, so it cannot
 218          * block.
 219          */
 220         void (*set_maintenance_mode)(void *send_info, bool enable);
 221 };
 222
 223 struct ipmi_device_id {
 224         unsigned char device_id;
 225         unsigned char device_revision;
 226         unsigned char firmware_revision_1;
 227         unsigned char firmware_revision_2;
 228         unsigned char ipmi_version;
 229         unsigned char additional_device_support;
 230         unsigned int  manufacturer_id;
 231         unsigned int  product_id;
 232         unsigned char aux_firmware_revision[4];
 233         unsigned int  aux_firmware_revision_set : 1;
 234 };
 235
 236 #define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
 237 #define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
 238
 239 /*
 240  * Take a pointer to an IPMI response and extract device id information from
 241  * it. @netfn is in the IPMI_NETFN_ format, so may need to be shifted from
 242  * a SI response.
 243  */
 244 static inline int ipmi_demangle_device_id(uint8_t netfn, uint8_t cmd,
 245                                           const unsigned char *data,
 246                                           unsigned int data_len,
 247                                           struct ipmi_device_id *id)
 248 {
 249         if (data_len < 7)
 250                 return -EINVAL;
 251         if (netfn != IPMI_NETFN_APP_RESPONSE || cmd != IPMI_GET_DEVICE_ID_CMD)
 252                 /* Strange, didn't get the response we expected. */
 253                 return -EINVAL;
 254         if (data[0] != 0)
 255                 /* That's odd, it shouldn't be able to fail. */
 256                 return -EINVAL;
 257
 258         data++;
 259         data_len--;
 260
 261         id->device_id = data[0];
 262         id->device_revision = data[1];
 263         id->firmware_revision_1 = data[2];
 264         id->firmware_revision_2 = data[3];
 265         id->ipmi_version = data[4];
 266         id->additional_device_support = data[5];
 267         if (data_len >= 11) {
 268                 id->manufacturer_id = (data[6] | (data[7] << 8) |
 269                                        (data[8] << 16));
 270                 id->product_id = data[9] | (data[10] << 8);
 271         } else {
 272                 id->manufacturer_id = 0;
 273                 id->product_id = 0;
 274         }
 275         if (data_len >= 15) {
 276                 memcpy(id->aux_firmware_revision, data+11, 4);
 277                 id->aux_firmware_revision_set = 1;
 278         } else
 279                 id->aux_firmware_revision_set = 0;
 280
 281         return 0;
 282 }
 283
 284 /*
 285  * Add a low-level interface to the IPMI driver.  Note that if the
 286  * interface doesn't know its slave address, it should pass in zero.
 287  * The low-level interface should not deliver any messages to the
 288  * upper layer until the start_processing() function in the handlers
 289  * is called, and the lower layer must get the interface from that
 290  * call.
 291  */
 292 int ipmi_add_smi(struct module            *owner,
 293                  const struct ipmi_smi_handlers *handlers,
 294                  void                     *send_info,
 295                  struct device            *dev,
 296                  unsigned char            slave_addr);
 297
 298 #define ipmi_register_smi(handlers, send_info, dev, slave_addr) \
 299         ipmi_add_smi(THIS_MODULE, handlers, send_info, dev, slave_addr)
 300
 301 /*
 302  * Remove a low-level interface from the IPMI driver.  This will
 303  * return an error if the interface is still in use by a user.
 304  */
 305 void ipmi_unregister_smi(struct ipmi_smi *intf);
 306
 307 /*
 308  * The lower layer reports received messages through this interface.
 309  * The data_size should be zero if this is an asynchronous message.  If
 310  * the lower layer gets an error sending a message, it should format
 311  * an error response in the message response.
 312  */
 313 void ipmi_smi_msg_received(struct ipmi_smi     *intf,
 314                            struct ipmi_smi_msg *msg);
 315
 316 /* The lower layer received a watchdog pre-timeout on interface. */
 317 void ipmi_smi_watchdog_pretimeout(struct ipmi_smi *intf);
 318
 319 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
 320 static inline void ipmi_free_smi_msg(struct ipmi_smi_msg *msg)
 321 {
 322         msg->done(msg);
 323 }
 324
 325 #endif /* __LINUX_IPMI_SMI_H */