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 {
  65         struct list_head link;
  66
  67         long    msgid;
  68         void    *user_data;
  69
  70         int           data_size;
  71         unsigned char data[IPMI_MAX_MSG_LENGTH];
  72
  73         int           rsp_size;
  74         unsigned char rsp[IPMI_MAX_MSG_LENGTH];
  75
  76         /* Will be called when the system is done with the message
  77            (presumably to free it). */
  78         void (*done)(struct ipmi_smi_msg *msg);
  79 };
  80
  81 struct ipmi_smi_handlers
  82 {
  83         struct module *owner;
  84
  85         /* The low-level interface cannot start sending messages to
  86            the upper layer until this function is called.  This may
  87            not be NULL, the lower layer must take the interface from
  88            this call. */
  89         int (*start_processing)(void       *send_info,
  90                                 ipmi_smi_t new_intf);
  91
  92         /* Called to enqueue an SMI message to be sent.  This
  93            operation is not allowed to fail.  If an error occurs, it
  94            should report back the error in a received message.  It may
  95            do this in the current call context, since no write locks
  96            are held when this is run.  If the priority is > 0, the
  97            message will go into a high-priority queue and be sent
  98            first.  Otherwise, it goes into a normal-priority queue. */
  99         void (*sender)(void                *send_info,
 100                        struct ipmi_smi_msg *msg,
 101                        int                 priority);
 102
 103         /* Called by the upper layer to request that we try to get
 104            events from the BMC we are attached to. */
 105         void (*request_events)(void *send_info);
 106
 107         /* Called when the interface should go into "run to
 108            completion" mode.  If this call sets the value to true, the
 109            interface should make sure that all messages are flushed
 110            out and that none are pending, and any new requests are run
 111            to completion immediately. */
 112         void (*set_run_to_completion)(void *send_info, int run_to_completion);
 113
 114         /* Called to poll for work to do.  This is so upper layers can
 115            poll for operations during things like crash dumps. */
 116         void (*poll)(void *send_info);
 117
 118         /* Enable/disable firmware maintenance mode.  Note that this
 119            is *not* the modes defined, this is simply an on/off
 120            setting.  The message handler does the mode handling.  Note
 121            that this is called from interrupt context, so it cannot
 122            block. */
 123         void (*set_maintenance_mode)(void *send_info, int enable);
 124
 125         /* Tell the handler that we are using it/not using it.  The
 126            message handler get the modules that this handler belongs
 127            to; this function lets the SMI claim any modules that it
 128            uses.  These may be NULL if this is not required. */
 129         int (*inc_usecount)(void *send_info);
 130         void (*dec_usecount)(void *send_info);
 131 };
 132
 133 struct ipmi_device_id {
 134         unsigned char device_id;
 135         unsigned char device_revision;
 136         unsigned char firmware_revision_1;
 137         unsigned char firmware_revision_2;
 138         unsigned char ipmi_version;
 139         unsigned char additional_device_support;
 140         unsigned int  manufacturer_id;
 141         unsigned int  product_id;
 142         unsigned char aux_firmware_revision[4];
 143         unsigned int  aux_firmware_revision_set : 1;
 144 };
 145
 146 #define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
 147 #define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
 148
 149 /* Take a pointer to a raw data buffer and a length and extract device
 150    id information from it.  The first byte of data must point to the
 151    netfn << 2, the data should be of the format:
 152       netfn << 2, cmd, completion code, data
 153    as normally comes from a device interface. */
 154 static inline int ipmi_demangle_device_id(const unsigned char *data,
 155                                           unsigned int data_len,
 156                                           struct ipmi_device_id *id)
 157 {
 158         if (data_len < 9)
 159                 return -EINVAL;
 160         if (data[0] != IPMI_NETFN_APP_RESPONSE << 2 ||
 161             data[1] != IPMI_GET_DEVICE_ID_CMD)
 162                 /* Strange, didn't get the response we expected. */
 163                 return -EINVAL;
 164         if (data[2] != 0)
 165                 /* That's odd, it shouldn't be able to fail. */
 166                 return -EINVAL;
 167
 168         data += 3;
 169         data_len -= 3;
 170         id->device_id = data[0];
 171         id->device_revision = data[1];
 172         id->firmware_revision_1 = data[2];
 173         id->firmware_revision_2 = data[3];
 174         id->ipmi_version = data[4];
 175         id->additional_device_support = data[5];
 176         if (data_len >= 11) {
 177                 id->manufacturer_id = (data[6] | (data[7] << 8) |
 178                                        (data[8] << 16));
 179                 id->product_id = data[9] | (data[10] << 8);
 180         } else {
 181                 id->manufacturer_id = 0;
 182                 id->product_id = 0;
 183         }
 184         if (data_len >= 15) {
 185                 memcpy(id->aux_firmware_revision, data+11, 4);
 186                 id->aux_firmware_revision_set = 1;
 187         } else
 188                 id->aux_firmware_revision_set = 0;
 189
 190         return 0;
 191 }
 192
 193 /* Add a low-level interface to the IPMI driver.  Note that if the
 194    interface doesn't know its slave address, it should pass in zero.
 195    The low-level interface should not deliver any messages to the
 196    upper layer until the start_processing() function in the handlers
 197    is called, and the lower layer must get the interface from that
 198    call. */
 199 int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
 200                       void                     *send_info,
 201                       struct ipmi_device_id    *device_id,
 202                       struct device            *dev,
 203                       const char               *sysfs_name,
 204                       unsigned char            slave_addr);
 205
 206 /*
 207  * Remove a low-level interface from the IPMI driver.  This will
 208  * return an error if the interface is still in use by a user.
 209  */
 210 int ipmi_unregister_smi(ipmi_smi_t intf);
 211
 212 /*
 213  * The lower layer reports received messages through this interface.
 214  * The data_size should be zero if this is an asyncronous message.  If
 215  * the lower layer gets an error sending a message, it should format
 216  * an error response in the message response.
 217  */
 218 void ipmi_smi_msg_received(ipmi_smi_t          intf,
 219                            struct ipmi_smi_msg *msg);
 220
 221 /* The lower layer received a watchdog pre-timeout on interface. */
 222 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf);
 223
 224 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
 225 static inline void ipmi_free_smi_msg(struct ipmi_smi_msg *msg)
 226 {
 227         msg->done(msg);
 228 }
 229
 230 /* Allow the lower layer to add things to the proc filesystem
 231    directory for this interface.  Note that the entry will
 232    automatically be dstroyed when the interface is destroyed. */
 233 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
 234                             read_proc_t *read_proc, write_proc_t *write_proc,
 235                             void *data, struct module *owner);
 236
 237 #endif /* __LINUX_IPMI_SMI_H */