include/linux/ipmi_smi.h

   1 /*
   2  * ipmi_smi.h
   3  *
   4  * MontaVista IPMI system management interface
   5  *
   6  * Author: MontaVista Software, Inc.
   7  *         Corey Minyard <minyard@mvista.com>
   8  *         source@mvista.com
   9  *
  10  * Copyright 2002 MontaVista Software Inc.
  11  *
  12  *  This program is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License as published by the
  14  *  Free Software Foundation; either version 2 of the License, or (at your
  15  *  option) any later version.
  16  *
  17  *
  18  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  24  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  26  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  27  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  *  You should have received a copy of the GNU General Public License along
  30  *  with this program; if not, write to the Free Software Foundation, Inc.,
  31  *  675 Mass Ave, Cambridge, MA 02139, USA.
  32  */
  33
  34 #ifndef __LINUX_IPMI_SMI_H
  35 #define __LINUX_IPMI_SMI_H
  36
  37 #include <linux/ipmi_msgdefs.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/platform_device.h>
  40 #include <linux/ipmi.h>
  41
  42 struct device;
  43
  44 /* This files describes the interface for IPMI system management interface
  45    drivers to bind into the IPMI message handler. */
  46
  47 /* Structure for the low-level drivers. */
  48 typedef struct ipmi_smi *ipmi_smi_t;
  49
  50 /*
  51  * Messages to/from the lower layer.  The smi interface will take one
  52  * of these to send. After the send has occurred and a response has
  53  * been received, it will report this same data structure back up to
  54  * the upper layer.  If an error occurs, it should fill in the
  55  * response with an error code in the completion code location. When
  56  * asynchronous data is received, one of these is allocated, the
  57  * data_size is set to zero and the response holds the data from the
  58  * get message or get event command that the interface initiated.
  59  * Note that it is the interfaces responsibility to detect
  60  * asynchronous data and messages and request them from the
  61  * interface.
  62  */
  63 struct ipmi_smi_msg {
  64         struct list_head link;
  65
  66         long    msgid;
  67         void    *user_data;
  68
  69         int           data_size;
  70         unsigned char data[IPMI_MAX_MSG_LENGTH];
  71
  72         int           rsp_size;
  73         unsigned char rsp[IPMI_MAX_MSG_LENGTH];
  74
  75         /* Will be called when the system is done with the message
  76            (presumably to free it). */
  77         void (*done)(struct ipmi_smi_msg *msg);
  78 };
  79
  80 struct ipmi_smi_handlers {
  81         struct module *owner;
  82
  83         /* The low-level interface cannot start sending messages to
  84            the upper layer until this function is called.  This may
  85            not be NULL, the lower layer must take the interface from
  86            this call. */
  87         int (*start_processing)(void       *send_info,
  88                                 ipmi_smi_t new_intf);
  89
  90         /*
  91          * Get the detailed private info of the low level interface and store
  92          * it into the structure of ipmi_smi_data. For example: the
  93          * ACPI device handle will be returned for the pnp_acpi IPMI device.
  94          */
  95         int (*get_smi_info)(void *send_info, struct ipmi_smi_info *data);
  96
  97         /* Called to enqueue an SMI message to be sent.  This
  98            operation is not allowed to fail.  If an error occurs, it
  99            should report back the error in a received message.  It may
 100            do this in the current call context, since no write locks
 101            are held when this is run.  Message are delivered one at
 102            a time by the message handler, a new message will not be
 103            delivered until the previous message is returned. */
 104         void (*sender)(void                *send_info,
 105                        struct ipmi_smi_msg *msg);
 106
 107         /* Called by the upper layer to request that we try to get
 108            events from the BMC we are attached to. */
 109         void (*request_events)(void *send_info);
 110
 111         /* Called by the upper layer when some user requires that the
 112            interface watch for events, received messages, watchdog
 113            pretimeouts, or not.  Used by the SMI to know if it should
 114            watch for these.  This may be NULL if the SMI does not
 115            implement it. */
 116         void (*set_need_watch)(void *send_info, bool enable);
 117
 118         /*
 119          * Called when flushing all pending messages.
 120          */
 121         void (*flush_messages)(void *send_info);
 122
 123         /* Called when the interface should go into "run to
 124            completion" mode.  If this call sets the value to true, the
 125            interface should make sure that all messages are flushed
 126            out and that none are pending, and any new requests are run
 127            to completion immediately. */
 128         void (*set_run_to_completion)(void *send_info, bool run_to_completion);
 129
 130         /* Called to poll for work to do.  This is so upper layers can
 131            poll for operations during things like crash dumps. */
 132         void (*poll)(void *send_info);
 133
 134         /* Enable/disable firmware maintenance mode.  Note that this
 135            is *not* the modes defined, this is simply an on/off
 136            setting.  The message handler does the mode handling.  Note
 137            that this is called from interrupt context, so it cannot
 138            block. */
 139         void (*set_maintenance_mode)(void *send_info, bool enable);
 140
 141         /* Tell the handler that we are using it/not using it.  The
 142            message handler get the modules that this handler belongs
 143            to; this function lets the SMI claim any modules that it
 144            uses.  These may be NULL if this is not required. */
 145         int (*inc_usecount)(void *send_info);
 146         void (*dec_usecount)(void *send_info);
 147 };
 148
 149 struct ipmi_device_id {
 150         unsigned char device_id;
 151         unsigned char device_revision;
 152         unsigned char firmware_revision_1;
 153         unsigned char firmware_revision_2;
 154         unsigned char ipmi_version;
 155         unsigned char additional_device_support;
 156         unsigned int  manufacturer_id;
 157         unsigned int  product_id;
 158         unsigned char aux_firmware_revision[4];
 159         unsigned int  aux_firmware_revision_set : 1;
 160 };
 161
 162 #define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
 163 #define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
 164
 165 /* Take a pointer to an IPMI response and extract device id information from
 166  * it. @netfn is in the IPMI_NETFN_ format, so may need to be shifted from
 167  * a SI response.
 168  */
 169 static inline int ipmi_demangle_device_id(uint8_t netfn, uint8_t cmd,
 170                                           const unsigned char *data,
 171                                           unsigned int data_len,
 172                                           struct ipmi_device_id *id)
 173 {
 174         if (data_len < 7)
 175                 return -EINVAL;
 176         if (netfn != IPMI_NETFN_APP_RESPONSE || cmd != IPMI_GET_DEVICE_ID_CMD)
 177                 /* Strange, didn't get the response we expected. */
 178                 return -EINVAL;
 179         if (data[0] != 0)
 180                 /* That's odd, it shouldn't be able to fail. */
 181                 return -EINVAL;
 182
 183         data++;
 184         data_len--;
 185
 186         id->device_id = data[0];
 187         id->device_revision = data[1];
 188         id->firmware_revision_1 = data[2];
 189         id->firmware_revision_2 = data[3];
 190         id->ipmi_version = data[4];
 191         id->additional_device_support = data[5];
 192         if (data_len >= 11) {
 193                 id->manufacturer_id = (data[6] | (data[7] << 8) |
 194                                        (data[8] << 16));
 195                 id->product_id = data[9] | (data[10] << 8);
 196         } else {
 197                 id->manufacturer_id = 0;
 198                 id->product_id = 0;
 199         }
 200         if (data_len >= 15) {
 201                 memcpy(id->aux_firmware_revision, data+11, 4);
 202                 id->aux_firmware_revision_set = 1;
 203         } else
 204                 id->aux_firmware_revision_set = 0;
 205
 206         return 0;
 207 }
 208
 209 /* Add a low-level interface to the IPMI driver.  Note that if the
 210    interface doesn't know its slave address, it should pass in zero.
 211    The low-level interface should not deliver any messages to the
 212    upper layer until the start_processing() function in the handlers
 213    is called, and the lower layer must get the interface from that
 214    call. */
 215 int ipmi_register_smi(const struct ipmi_smi_handlers *handlers,
 216                       void                     *send_info,
 217                       struct device            *dev,
 218                       unsigned char            slave_addr);
 219
 220 /*
 221  * Remove a low-level interface from the IPMI driver.  This will
 222  * return an error if the interface is still in use by a user.
 223  */
 224 int ipmi_unregister_smi(ipmi_smi_t intf);
 225
 226 /*
 227  * The lower layer reports received messages through this interface.
 228  * The data_size should be zero if this is an asynchronous message.  If
 229  * the lower layer gets an error sending a message, it should format
 230  * an error response in the message response.
 231  */
 232 void ipmi_smi_msg_received(ipmi_smi_t          intf,
 233                            struct ipmi_smi_msg *msg);
 234
 235 /* The lower layer received a watchdog pre-timeout on interface. */
 236 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf);
 237
 238 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
 239 static inline void ipmi_free_smi_msg(struct ipmi_smi_msg *msg)
 240 {
 241         msg->done(msg);
 242 }
 243
 244 #ifdef CONFIG_IPMI_PROC_INTERFACE
 245 /* Allow the lower layer to add things to the proc filesystem
 246    directory for this interface.  Note that the entry will
 247    automatically be dstroyed when the interface is destroyed. */
 248 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
 249                             const struct file_operations *proc_ops,
 250                             void *data);
 251 #endif
 252
 253 #endif /* __LINUX_IPMI_SMI_H */