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/module.h>
  40 #include <linux/device.h>
  41 #include <linux/platform_device.h>
  42 #include <linux/ipmi_smi.h>
  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         /* Called to enqueue an SMI message to be sent.  This
  91            operation is not allowed to fail.  If an error occurs, it
  92            should report back the error in a received message.  It may
  93            do this in the current call context, since no write locks
  94            are held when this is run.  If the priority is > 0, the
  95            message will go into a high-priority queue and be sent
  96            first.  Otherwise, it goes into a normal-priority queue. */
  97         void (*sender)(void                *send_info,
  98                        struct ipmi_smi_msg *msg,
  99                        int                 priority);
 100
 101         /* Called by the upper layer to request that we try to get
 102            events from the BMC we are attached to. */
 103         void (*request_events)(void *send_info);
 104
 105         /* Called when the interface should go into "run to
 106            completion" mode.  If this call sets the value to true, the
 107            interface should make sure that all messages are flushed
 108            out and that none are pending, and any new requests are run
 109            to completion immediately. */
 110         void (*set_run_to_completion)(void *send_info, int run_to_completion);
 111
 112         /* Called to poll for work to do.  This is so upper layers can
 113            poll for operations during things like crash dumps. */
 114         void (*poll)(void *send_info);
 115
 116         /* Enable/disable firmware maintenance mode.  Note that this
 117            is *not* the modes defined, this is simply an on/off
 118            setting.  The message handler does the mode handling.  Note
 119            that this is called from interrupt context, so it cannot
 120            block. */
 121         void (*set_maintenance_mode)(void *send_info, int enable);
 122
 123         /* Tell the handler that we are using it/not using it.  The
 124            message handler get the modules that this handler belongs
 125            to; this function lets the SMI claim any modules that it
 126            uses.  These may be NULL if this is not required. */
 127         int (*inc_usecount)(void *send_info);
 128         void (*dec_usecount)(void *send_info);
 129 };
 130
 131 struct ipmi_device_id {
 132         unsigned char device_id;
 133         unsigned char device_revision;
 134         unsigned char firmware_revision_1;
 135         unsigned char firmware_revision_2;
 136         unsigned char ipmi_version;
 137         unsigned char additional_device_support;
 138         unsigned int  manufacturer_id;
 139         unsigned int  product_id;
 140         unsigned char aux_firmware_revision[4];
 141         unsigned int  aux_firmware_revision_set : 1;
 142 };
 143
 144 #define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
 145 #define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
 146
 147 /* Take a pointer to a raw data buffer and a length and extract device
 148    id information from it.  The first byte of data must point to the
 149    netfn << 2, the data should be of the format:
 150       netfn << 2, cmd, completion code, data
 151    as normally comes from a device interface. */
 152 static inline int ipmi_demangle_device_id(const unsigned char *data,
 153                                           unsigned int data_len,
 154                                           struct ipmi_device_id *id)
 155 {
 156         if (data_len < 9)
 157                 return -EINVAL;
 158         if (data[0] != IPMI_NETFN_APP_RESPONSE << 2 ||
 159             data[1] != IPMI_GET_DEVICE_ID_CMD)
 160                 /* Strange, didn't get the response we expected. */
 161                 return -EINVAL;
 162         if (data[2] != 0)
 163                 /* That's odd, it shouldn't be able to fail. */
 164                 return -EINVAL;
 165
 166         data += 3;
 167         data_len -= 3;
 168         id->device_id = data[0];
 169         id->device_revision = data[1];
 170         id->firmware_revision_1 = data[2];
 171         id->firmware_revision_2 = data[3];
 172         id->ipmi_version = data[4];
 173         id->additional_device_support = data[5];
 174         if (data_len >= 11) {
 175                 id->manufacturer_id = (data[6] | (data[7] << 8) |
 176                                        (data[8] << 16));
 177                 id->product_id = data[9] | (data[10] << 8);
 178         } else {
 179                 id->manufacturer_id = 0;
 180                 id->product_id = 0;
 181         }
 182         if (data_len >= 15) {
 183                 memcpy(id->aux_firmware_revision, data+11, 4);
 184                 id->aux_firmware_revision_set = 1;
 185         } else
 186                 id->aux_firmware_revision_set = 0;
 187
 188         return 0;
 189 }
 190
 191 /* Add a low-level interface to the IPMI driver.  Note that if the
 192    interface doesn't know its slave address, it should pass in zero.
 193    The low-level interface should not deliver any messages to the
 194    upper layer until the start_processing() function in the handlers
 195    is called, and the lower layer must get the interface from that
 196    call. */
 197 int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
 198                       void                     *send_info,
 199                       struct ipmi_device_id    *device_id,
 200                       struct device            *dev,
 201                       const char               *sysfs_name,
 202                       unsigned char            slave_addr);
 203
 204 /*
 205  * Remove a low-level interface from the IPMI driver.  This will
 206  * return an error if the interface is still in use by a user.
 207  */
 208 int ipmi_unregister_smi(ipmi_smi_t intf);
 209
 210 /*
 211  * The lower layer reports received messages through this interface.
 212  * The data_size should be zero if this is an asyncronous message.  If
 213  * the lower layer gets an error sending a message, it should format
 214  * an error response in the message response.
 215  */
 216 void ipmi_smi_msg_received(ipmi_smi_t          intf,
 217                            struct ipmi_smi_msg *msg);
 218
 219 /* The lower layer received a watchdog pre-timeout on interface. */
 220 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf);
 221
 222 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
 223 static inline void ipmi_free_smi_msg(struct ipmi_smi_msg *msg)
 224 {
 225         msg->done(msg);
 226 }
 227
 228 /* Allow the lower layer to add things to the proc filesystem
 229    directory for this interface.  Note that the entry will
 230    automatically be dstroyed when the interface is destroyed. */
 231 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
 232                             read_proc_t *read_proc,
 233                             void *data, struct module *owner);
 234
 235 #endif /* __LINUX_IPMI_SMI_H */