[PATCH] ipmi: add per-channel IPMB addresses

IPMI allows multiple IPMB channels on a single interface, and each channel
might have a different IPMB address.  However, the driver has only one IPMB
address that it uses for everything.  This patch adds new IOCTLS and a new
internal interface for setting per-channel IPMB addresses and LUNs.  New
systems are coming out with support for multiple IPMB channels, and they are
broken without this patch.

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 201 insertions, 60 deletions

diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
index e0a53570fea1..5571e92c520f 100644
--- a/drivers/char/ipmi/ipmi_devintf.c
+++ b/drivers/char/ipmi/ipmi_devintf.c
@@ -411,6 +411,7 @@ static int ipmi_ioctl(struct inode  *inode,
                 break;
         }
 
+        /* The next four are legacy, not per-channel. */
         case IPMICTL_SET_MY_ADDRESS_CMD:
         {
                 unsigned int val;
@@ -420,22 +421,25 @@ static int ipmi_ioctl(struct inode  *inode,
                         break;
                 }
 
-                ipmi_set_my_address(priv->user, val);
-                rv = 0;
+                rv = ipmi_set_my_address(priv->user, 0, val);
                 break;
         }
 
         case IPMICTL_GET_MY_ADDRESS_CMD:
         {
-                unsigned int val;
+                unsigned int  val;
+                unsigned char rval;
+
+                rv = ipmi_get_my_address(priv->user, 0, &rval);
+                if (rv)
+                        break;
 
-                val = ipmi_get_my_address(priv->user);
+                val = rval;
 
                 if (copy_to_user(arg, &val, sizeof(val))) {
                         rv = -EFAULT;
                         break;
                 }
-                rv = 0;
                 break;
         }
 
@@ -448,24 +452,94 @@ static int ipmi_ioctl(struct inode  *inode,
                         break;
                 }
 
-                ipmi_set_my_LUN(priv->user, val);
-                rv = 0;
+                rv = ipmi_set_my_LUN(priv->user, 0, val);
                 break;
         }
 
         case IPMICTL_GET_MY_LUN_CMD:
         {
-                unsigned int val;
+                unsigned int  val;
+                unsigned char rval;
+
+                rv = ipmi_get_my_LUN(priv->user, 0, &rval);
+                if (rv)
+                        break;
 
-                val = ipmi_get_my_LUN(priv->user);
+                val = rval;
 
                 if (copy_to_user(arg, &val, sizeof(val))) {
                         rv = -EFAULT;
                         break;
                 }
-                rv = 0;
                 break;
         }
+
+        case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD:
+        {
+                struct ipmi_channel_lun_address_set val;
+
+                if (copy_from_user(&val, arg, sizeof(val))) {
+                        rv = -EFAULT;
+                        break;
+                }
+
+                return ipmi_set_my_address(priv->user, val.channel, val.value);
+                break;
+        }
+
+        case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD:
+        {
+                struct ipmi_channel_lun_address_set val;
+
+                if (copy_from_user(&val, arg, sizeof(val))) {
+                        rv = -EFAULT;
+                        break;
+                }
+
+                rv = ipmi_get_my_address(priv->user, val.channel, &val.value);
+                if (rv)
+                        break;
+
+                if (copy_to_user(arg, &val, sizeof(val))) {
+                        rv = -EFAULT;
+                        break;
+                }
+                break;
+        }
+
+        case IPMICTL_SET_MY_CHANNEL_LUN_CMD:
+        {
+                struct ipmi_channel_lun_address_set val;
+
+                if (copy_from_user(&val, arg, sizeof(val))) {
+                        rv = -EFAULT;
+                        break;
+                }
+
+                rv = ipmi_set_my_LUN(priv->user, val.channel, val.value);
+                break;
+        }
+
+        case IPMICTL_GET_MY_CHANNEL_LUN_CMD:
+        {
+                struct ipmi_channel_lun_address_set val;
+
+                if (copy_from_user(&val, arg, sizeof(val))) {
+                        rv = -EFAULT;
+                        break;
+                }
+
+                rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value);
+                if (rv)
+                        break;
+
+                if (copy_to_user(arg, &val, sizeof(val))) {
+                        rv = -EFAULT;
+                        break;
+                }
+                break;
+        }
+
         case IPMICTL_SET_TIMING_PARMS_CMD:
         {
                 struct ipmi_timing_parms parms;
diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index e16c13fe698d..84d477c6f925 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -124,6 +124,14 @@ struct ipmi_channel
 {
         unsigned char medium;
         unsigned char protocol;
+
+        /* My slave address.  This is initialized to IPMI_BMC_SLAVE_ADDR,
+           but may be changed by the user. */
+        unsigned char address;
+
+        /* My LUN.  This should generally stay the SMS LUN, but just in
+           case... */
+        unsigned char lun;
 };
 
 #ifdef CONFIG_PROC_FS
@@ -135,7 +143,7 @@ struct ipmi_proc_entry
 #endif
 
 #define IPMI_IPMB_NUM_SEQ       64
-#define IPMI_MAX_CHANNELS       8
+#define IPMI_MAX_CHANNELS       16
 struct ipmi_smi
 {
         /* What interface number are we? */
@@ -199,14 +207,6 @@ struct ipmi_smi
            this is registered. */
         ipmi_user_t all_cmd_rcvr;
 
-        /* My slave address.  This is initialized to IPMI_BMC_SLAVE_ADDR,
-           but may be changed by the user. */
-        unsigned char my_address;
-
-        /* My LUN.  This should generally stay the SMS LUN, but just in
-           case... */
-        unsigned char my_lun;
-
         /* The event receiver for my BMC, only really used at panic
            shutdown as a place to store this. */
         unsigned char event_receiver;
@@ -766,26 +766,44 @@ void ipmi_get_version(ipmi_user_t   user,
         *minor = user->intf->version_minor;
 }
 
-void ipmi_set_my_address(ipmi_user_t   user,
-                         unsigned char address)
+int ipmi_set_my_address(ipmi_user_t   user,
+                        unsigned int  channel,
+                        unsigned char address)
 {
-        user->intf->my_address = address;
+        if (channel >= IPMI_MAX_CHANNELS)
+                return -EINVAL;
+        user->intf->channels[channel].address = address;
+        return 0;
 }
 
-unsigned char ipmi_get_my_address(ipmi_user_t user)
+int ipmi_get_my_address(ipmi_user_t   user,
+                        unsigned int  channel,
+                        unsigned char *address)
 {
-        return user->intf->my_address;
+        if (channel >= IPMI_MAX_CHANNELS)
+                return -EINVAL;
+        *address = user->intf->channels[channel].address;
+        return 0;
 }
 
-void ipmi_set_my_LUN(ipmi_user_t   user,
-                     unsigned char LUN)
+int ipmi_set_my_LUN(ipmi_user_t   user,
+                    unsigned int  channel,
+                    unsigned char LUN)
 {
-        user->intf->my_lun = LUN & 0x3;
+        if (channel >= IPMI_MAX_CHANNELS)
+                return -EINVAL;
+        user->intf->channels[channel].lun = LUN & 0x3;
+        return 0;
 }
 
-unsigned char ipmi_get_my_LUN(ipmi_user_t user)
+int ipmi_get_my_LUN(ipmi_user_t   user,
+                    unsigned int  channel,
+                    unsigned char *address)
 {
-        return user->intf->my_lun;
+        if (channel >= IPMI_MAX_CHANNELS)
+                return -EINVAL;
+        *address = user->intf->channels[channel].lun;
+        return 0;
 }
 
 int ipmi_set_gets_events(ipmi_user_t user, int val)
@@ -1213,7 +1231,7 @@ static inline int i_ipmi_request(ipmi_user_t          user,
                 unsigned char         ipmb_seq;
                 long                  seqid;
 
-                if (addr->channel > IPMI_NUM_CHANNELS) {
+                if (addr->channel >= IPMI_NUM_CHANNELS) {
                         spin_lock_irqsave(&intf->counter_lock, flags);
                         intf->sent_invalid_commands++;
                         spin_unlock_irqrestore(&intf->counter_lock, flags);
@@ -1346,6 +1364,18 @@ static inline int i_ipmi_request(ipmi_user_t          user,
         return rv;
 }
 
+static int check_addr(ipmi_smi_t       intf,
+                      struct ipmi_addr *addr,
+                      unsigned char    *saddr,
+                      unsigned char    *lun)
+{
+        if (addr->channel >= IPMI_MAX_CHANNELS)
+                return -EINVAL;
+        *lun = intf->channels[addr->channel].lun;
+        *saddr = intf->channels[addr->channel].address;
+        return 0;
+}
+
 int ipmi_request_settime(ipmi_user_t      user,
                          struct ipmi_addr *addr,
                          long             msgid,
@@ -1355,6 +1385,12 @@ int ipmi_request_settime(ipmi_user_t      user,
                          int              retries,
                          unsigned int     retry_time_ms)
 {
+        unsigned char saddr, lun;
+        int           rv;
+
+        rv = check_addr(user->intf, addr, &saddr, &lun);
+        if (rv)
+                return rv;
         return i_ipmi_request(user,
                               user->intf,
                               addr,
@@ -1363,8 +1399,8 @@ int ipmi_request_settime(ipmi_user_t      user,
                               user_msg_data,
                               NULL, NULL,
                               priority,
-                              user->intf->my_address,
-                              user->intf->my_lun,
+                              saddr,
+                              lun,
                               retries,
                               retry_time_ms);
 }
@@ -1378,6 +1414,12 @@ int ipmi_request_supply_msgs(ipmi_user_t          user,
                              struct ipmi_recv_msg *supplied_recv,
                              int                  priority)
 {
+        unsigned char saddr, lun;
+        int           rv;
+
+        rv = check_addr(user->intf, addr, &saddr, &lun);
+        if (rv)
+                return rv;
         return i_ipmi_request(user,
                               user->intf,
                               addr,
@@ -1387,8 +1429,8 @@ int ipmi_request_supply_msgs(ipmi_user_t          user,
                               supplied_smi,
                               supplied_recv,
                               priority,
-                              user->intf->my_address,
-                              user->intf->my_lun,
+                              saddr,
+                              lun,
                               -1, 0);
 }
 
@@ -1397,8 +1439,15 @@ static int ipmb_file_read_proc(char *page, char **start, off_t off,
 {
         char       *out = (char *) page;
         ipmi_smi_t intf = data;
+        int        i;
+        int        rv= 0;
 
-        return sprintf(out, "%x\n", intf->my_address);
+        for (i=0; i<IPMI_MAX_CHANNELS; i++)
+                rv += sprintf(out+rv, "%x ", intf->channels[i].address);
+        out[rv-1] = '\n'; /* Replace the final space with a newline */
+        out[rv] = '\0';
+        rv++;
+        return rv;
 }
 
 static int version_file_read_proc(char *page, char **start, off_t off,
@@ -1592,8 +1641,8 @@ send_channel_info_cmd(ipmi_smi_t intf, int chan)
                               NULL,
                               NULL,
                               0,
-                              intf->my_address,
-                              intf->my_lun,
+                              intf->channels[0].address,
+                              intf->channels[0].lun,
                               -1, 0);
 }
 
@@ -1696,11 +1745,13 @@ int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
                         new_intf->intf_num = i;
                         new_intf->version_major = version_major;
                         new_intf->version_minor = version_minor;
-                        if (slave_addr == 0)
-                                new_intf->my_address = IPMI_BMC_SLAVE_ADDR;
-                        else
-                                new_intf->my_address = slave_addr;
-                        new_intf->my_lun = 2;  /* the SMS LUN. */
+                        for (j=0; j<IPMI_MAX_CHANNELS; j++) {
+                                new_intf->channels[j].address
+                                        = IPMI_BMC_SLAVE_ADDR;
+                                new_intf->channels[j].lun = 2;
+                        }
+                        if (slave_addr != 0)
+                                new_intf->channels[0].address = slave_addr;
                         rwlock_init(&(new_intf->users_lock));
                         INIT_LIST_HEAD(&(new_intf->users));
                         new_intf->handlers = handlers;
@@ -1985,7 +2036,7 @@ static int handle_ipmb_get_msg_cmd(ipmi_smi_t          intf,
                 msg->data[3] = msg->rsp[6];
                 msg->data[4] = ((netfn + 1) << 2) | (msg->rsp[7] & 0x3);
                 msg->data[5] = ipmb_checksum(&(msg->data[3]), 2);
-                msg->data[6] = intf->my_address;
+                msg->data[6] = intf->channels[msg->rsp[3] & 0xf].address;
                 /* rqseq/lun */
                 msg->data[7] = (msg->rsp[7] & 0xfc) | (msg->rsp[4] & 0x3);
                 msg->data[8] = msg->rsp[8]; /* cmd */
@@ -2919,8 +2970,8 @@ static void send_panic_events(char *str)
                                &smi_msg,
                                &recv_msg,
                                0,
-                               intf->my_address,
-                               intf->my_lun,
+                               intf->channels[0].address,
+                               intf->channels[0].lun,
                                0, 1); /* Don't retry, and don't wait. */
         }
 
@@ -2965,8 +3016,8 @@ static void send_panic_events(char *str)
                                &smi_msg,
                                &recv_msg,
                                0,
-                               intf->my_address,
-                               intf->my_lun,
+                               intf->channels[0].address,
+                               intf->channels[0].lun,
                                0, 1); /* Don't retry, and don't wait. */
 
                 if (intf->local_event_generator) {
@@ -2985,8 +3036,8 @@ static void send_panic_events(char *str)
                                        &smi_msg,
                                        &recv_msg,
                                        0,
-                                       intf->my_address,
-                                       intf->my_lun,
+                                       intf->channels[0].address,
+                                       intf->channels[0].lun,
                                        0, 1); /* no retry, and no wait. */
                 }
                 intf->null_user_handler = NULL;
@@ -2996,7 +3047,7 @@ static void send_panic_events(char *str)
                    be zero, and it must not be my address. */
                 if (((intf->event_receiver & 1) == 0)
                     && (intf->event_receiver != 0)
-                    && (intf->event_receiver != intf->my_address))
+                    && (intf->event_receiver != intf->channels[0].address))
                 {
                         /* The event receiver is valid, send an IPMB
                            message. */
@@ -3031,7 +3082,7 @@ static void send_panic_events(char *str)
                         data[0] = 0;
                         data[1] = 0;
                         data[2] = 0xf0; /* OEM event without timestamp. */
-                        data[3] = intf->my_address;
+                        data[3] = intf->channels[0].address;
                         data[4] = j++; /* sequence # */
                         /* Always give 11 bytes, so strncpy will fill
                            it with zeroes for me. */
@@ -3047,8 +3098,8 @@ static void send_panic_events(char *str)
                                        &smi_msg,
                                        &recv_msg,
                                        0,
-                                       intf->my_address,
-                                       intf->my_lun,
+                                       intf->channels[0].address,
+                                       intf->channels[0].lun,
                                        0, 1); /* no retry, and no wait. */
                 }
         }       
diff --git a/include/linux/ipmi.h b/include/linux/ipmi.h
index 596ca6130159..846b69899776 100644
--- a/include/linux/ipmi.h
+++ b/include/linux/ipmi.h
@@ -298,13 +298,19 @@ void ipmi_get_version(ipmi_user_t   user,
    this user, so it will affect all users of this interface.  This is
    so some initialization code can come in and do the OEM-specific
    things it takes to determine your address (if not the BMC) and set
-   it for everyone else. */
-void ipmi_set_my_address(ipmi_user_t   user,
-                         unsigned char address);
-unsigned char ipmi_get_my_address(ipmi_user_t user);
-void ipmi_set_my_LUN(ipmi_user_t   user,
-                     unsigned char LUN);
-unsigned char ipmi_get_my_LUN(ipmi_user_t user);
+   it for everyone else.  Note that each channel can have its own address. */
+int ipmi_set_my_address(ipmi_user_t   user,
+                        unsigned int  channel,
+                        unsigned char address);
+int ipmi_get_my_address(ipmi_user_t   user,
+                        unsigned int  channel,
+                        unsigned char *address);
+int ipmi_set_my_LUN(ipmi_user_t   user,
+                    unsigned int  channel,
+                    unsigned char LUN);
+int ipmi_get_my_LUN(ipmi_user_t   user,
+                    unsigned int  channel,
+                    unsigned char *LUN);
 
 /*
  * Like ipmi_request, but lets you specify the number of retries and
@@ -585,6 +591,16 @@ struct ipmi_cmdspec
  * things it takes to determine your address (if not the BMC) and set
  * it for everyone else.  You should probably leave the LUN alone.
  */
+struct ipmi_channel_lun_address_set
+{
+        unsigned short channel;
+        unsigned char  value;
+};
+#define IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD _IOR(IPMI_IOC_MAGIC, 24, struct ipmi_channel_lun_address_set)
+#define IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD _IOR(IPMI_IOC_MAGIC, 25, struct ipmi_channel_lun_address_set)
+#define IPMICTL_SET_MY_CHANNEL_LUN_CMD     _IOR(IPMI_IOC_MAGIC, 26, struct ipmi_channel_lun_address_set)
+#define IPMICTL_GET_MY_CHANNEL_LUN_CMD     _IOR(IPMI_IOC_MAGIC, 27, struct ipmi_channel_lun_address_set)
+/* Legacy interfaces, these only set IPMB 0. */
 #define IPMICTL_SET_MY_ADDRESS_CMD      _IOR(IPMI_IOC_MAGIC, 17, unsigned int)
 #define IPMICTL_GET_MY_ADDRESS_CMD      _IOR(IPMI_IOC_MAGIC, 18, unsigned int)
 #define IPMICTL_SET_MY_LUN_CMD          _IOR(IPMI_IOC_MAGIC, 19, unsigned int)