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gem5 / arm / linux / 529b3ca8323e282485b7c880e4cd26eaba15934f / . / drivers / char / ipmi / ipmi_msghandler.c
blob: 810b138f5897b85374b0cc19e7b175b86757d232 [file] [log] [blame]
/*
* ipmi_msghandler.c
*
* Incoming and outgoing message routing for an IPMI interface.
*
* Author: MontaVista Software, Inc.
* Corey Minyard <minyard@mvista.com>
* source@mvista.com
*
* Copyright 2002 MontaVista Software Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/ipmi.h>
#include <linux/ipmi_smi.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/rcupdate.h>
#include <linux/interrupt.h>
#define PFX "IPMI message handler: "
#define IPMI_DRIVER_VERSION "39.2"
static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void);
static int ipmi_init_msghandler(void);
static void smi_recv_tasklet(unsigned long);
static void handle_new_recv_msgs(ipmi_smi_t intf);
static void need_waiter(ipmi_smi_t intf);
static int handle_one_recv_msg(ipmi_smi_t intf,
struct ipmi_smi_msg *msg);
static int initialized;
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_ipmi_root;
#endif /* CONFIG_PROC_FS */
/* Remain in auto-maintenance mode for this amount of time (in ms). */
#define IPMI_MAINTENANCE_MODE_TIMEOUT 30000
#define MAX_EVENTS_IN_QUEUE 25
/*
* Don't let a message sit in a queue forever, always time it with at lest
* the max message timer. This is in milliseconds.
*/
#define MAX_MSG_TIMEOUT 60000
/* Call every ~1000 ms. */
#define IPMI_TIMEOUT_TIME 1000
/* How many jiffies does it take to get to the timeout time. */
#define IPMI_TIMEOUT_JIFFIES ((IPMI_TIMEOUT_TIME * HZ) / 1000)
/*
* Request events from the queue every second (this is the number of
* IPMI_TIMEOUT_TIMES between event requests). Hopefully, in the
* future, IPMI will add a way to know immediately if an event is in
* the queue and this silliness can go away.
*/
#define IPMI_REQUEST_EV_TIME (1000 / (IPMI_TIMEOUT_TIME))
/*
* The main "user" data structure.
*/
struct ipmi_user {
struct list_head link;
/* Set to false when the user is destroyed. */
bool valid;
struct kref refcount;
/* The upper layer that handles receive messages. */
const struct ipmi_user_hndl *handler;
void *handler_data;
/* The interface this user is bound to. */
ipmi_smi_t intf;
/* Does this interface receive IPMI events? */
bool gets_events;
};
struct cmd_rcvr {
struct list_head link;
ipmi_user_t user;
unsigned char netfn;
unsigned char cmd;
unsigned int chans;
/*
* This is used to form a linked lised during mass deletion.
* Since this is in an RCU list, we cannot use the link above
* or change any data until the RCU period completes. So we
* use this next variable during mass deletion so we can have
* a list and don't have to wait and restart the search on
* every individual deletion of a command.
*/
struct cmd_rcvr *next;
};
struct seq_table {
unsigned int inuse : 1;
unsigned int broadcast : 1;
unsigned long timeout;
unsigned long orig_timeout;
unsigned int retries_left;
/*
* To verify on an incoming send message response that this is
* the message that the response is for, we keep a sequence id
* and increment it every time we send a message.
*/
long seqid;
/*
* This is held so we can properly respond to the message on a
* timeout, and it is used to hold the temporary data for
* retransmission, too.
*/
struct ipmi_recv_msg *recv_msg;
};
/*
* Store the information in a msgid (long) to allow us to find a
* sequence table entry from the msgid.
*/
#define STORE_SEQ_IN_MSGID(seq, seqid) \
((((seq) & 0x3f) << 26) | ((seqid) & 0x3ffffff))
#define GET_SEQ_FROM_MSGID(msgid, seq, seqid) \
do { \
seq = (((msgid) >> 26) & 0x3f); \
seqid = ((msgid) & 0x3ffffff); \
} while (0)
#define NEXT_SEQID(seqid) (((seqid) + 1) & 0x3ffffff)
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
struct ipmi_proc_entry {
char *name;
struct ipmi_proc_entry *next;
};
#endif
struct bmc_device {
struct platform_device pdev;
struct ipmi_device_id id;
unsigned char guid[16];
int guid_set;
char name[16];
struct kref usecount;
};
#define to_bmc_device(x) container_of((x), struct bmc_device, pdev.dev)
/*
* Various statistics for IPMI, these index stats[] in the ipmi_smi
* structure.
*/
enum ipmi_stat_indexes {
/* Commands we got from the user that were invalid. */
IPMI_STAT_sent_invalid_commands = 0,
/* Commands we sent to the MC. */
IPMI_STAT_sent_local_commands,
/* Responses from the MC that were delivered to a user. */
IPMI_STAT_handled_local_responses,
/* Responses from the MC that were not delivered to a user. */
IPMI_STAT_unhandled_local_responses,
/* Commands we sent out to the IPMB bus. */
IPMI_STAT_sent_ipmb_commands,
/* Commands sent on the IPMB that had errors on the SEND CMD */
IPMI_STAT_sent_ipmb_command_errs,
/* Each retransmit increments this count. */
IPMI_STAT_retransmitted_ipmb_commands,
/*
* When a message times out (runs out of retransmits) this is
* incremented.
*/
IPMI_STAT_timed_out_ipmb_commands,
/*
* This is like above, but for broadcasts. Broadcasts are
* *not* included in the above count (they are expected to
* time out).
*/
IPMI_STAT_timed_out_ipmb_broadcasts,
/* Responses I have sent to the IPMB bus. */
IPMI_STAT_sent_ipmb_responses,
/* The response was delivered to the user. */
IPMI_STAT_handled_ipmb_responses,
/* The response had invalid data in it. */
IPMI_STAT_invalid_ipmb_responses,
/* The response didn't have anyone waiting for it. */
IPMI_STAT_unhandled_ipmb_responses,
/* Commands we sent out to the IPMB bus. */
IPMI_STAT_sent_lan_commands,
/* Commands sent on the IPMB that had errors on the SEND CMD */
IPMI_STAT_sent_lan_command_errs,
/* Each retransmit increments this count. */
IPMI_STAT_retransmitted_lan_commands,
/*
* When a message times out (runs out of retransmits) this is
* incremented.
*/
IPMI_STAT_timed_out_lan_commands,
/* Responses I have sent to the IPMB bus. */
IPMI_STAT_sent_lan_responses,
/* The response was delivered to the user. */
IPMI_STAT_handled_lan_responses,
/* The response had invalid data in it. */
IPMI_STAT_invalid_lan_responses,
/* The response didn't have anyone waiting for it. */
IPMI_STAT_unhandled_lan_responses,
/* The command was delivered to the user. */
IPMI_STAT_handled_commands,
/* The command had invalid data in it. */
IPMI_STAT_invalid_commands,
/* The command didn't have anyone waiting for it. */
IPMI_STAT_unhandled_commands,
/* Invalid data in an event. */
IPMI_STAT_invalid_events,
/* Events that were received with the proper format. */
IPMI_STAT_events,
/* Retransmissions on IPMB that failed. */
IPMI_STAT_dropped_rexmit_ipmb_commands,
/* Retransmissions on LAN that failed. */
IPMI_STAT_dropped_rexmit_lan_commands,
/* This *must* remain last, add new values above this. */
IPMI_NUM_STATS
};
#define IPMI_IPMB_NUM_SEQ 64
#define IPMI_MAX_CHANNELS 16
struct ipmi_smi {
/* What interface number are we? */
int intf_num;
struct kref refcount;
/* Set when the interface is being unregistered. */
bool in_shutdown;
/* Used for a list of interfaces. */
struct list_head link;
/*
* The list of upper layers that are using me. seq_lock
* protects this.
*/
struct list_head users;
/* Information to supply to users. */
unsigned char ipmi_version_major;
unsigned char ipmi_version_minor;
/* Used for wake ups at startup. */
wait_queue_head_t waitq;
struct bmc_device *bmc;
char *my_dev_name;
/*
* This is the lower-layer's sender routine. Note that you
* must either be holding the ipmi_interfaces_mutex or be in
* an umpreemptible region to use this. You must fetch the
* value into a local variable and make sure it is not NULL.
*/
const struct ipmi_smi_handlers *handlers;
void *send_info;
#ifdef CONFIG_PROC_FS
/* A list of proc entries for this interface. */
struct mutex proc_entry_lock;
struct ipmi_proc_entry *proc_entries;
#endif
/* Driver-model device for the system interface. */
struct device *si_dev;
/*
* A table of sequence numbers for this interface. We use the
* sequence numbers for IPMB messages that go out of the
* interface to match them up with their responses. A routine
* is called periodically to time the items in this list.
*/
spinlock_t seq_lock;
struct seq_table seq_table[IPMI_IPMB_NUM_SEQ];
int curr_seq;
/*
* Messages queued for delivery. If delivery fails (out of memory
* for instance), They will stay in here to be processed later in a
* periodic timer interrupt. The tasklet is for handling received
* messages directly from the handler.
*/
spinlock_t waiting_rcv_msgs_lock;
struct list_head waiting_rcv_msgs;
atomic_t watchdog_pretimeouts_to_deliver;
struct tasklet_struct recv_tasklet;
spinlock_t xmit_msgs_lock;
struct list_head xmit_msgs;
struct ipmi_smi_msg *curr_msg;
struct list_head hp_xmit_msgs;
/*
* The list of command receivers that are registered for commands
* on this interface.
*/
struct mutex cmd_rcvrs_mutex;
struct list_head cmd_rcvrs;
/*
* Events that were queues because no one was there to receive
* them.
*/
spinlock_t events_lock; /* For dealing with event stuff. */
struct list_head waiting_events;
unsigned int waiting_events_count; /* How many events in queue? */
char delivering_events;
char event_msg_printed;
atomic_t event_waiters;
unsigned int ticks_to_req_ev;
int last_needs_timer;
/*
* The event receiver for my BMC, only really used at panic
* shutdown as a place to store this.
*/
unsigned char event_receiver;
unsigned char event_receiver_lun;
unsigned char local_sel_device;
unsigned char local_event_generator;
/* For handling of maintenance mode. */
int maintenance_mode;
bool maintenance_mode_enable;
int auto_maintenance_timeout;
spinlock_t maintenance_mode_lock; /* Used in a timer... */
/*
* A cheap hack, if this is non-null and a message to an
* interface comes in with a NULL user, call this routine with
* it. Note that the message will still be freed by the
* caller. This only works on the system interface.
*/
void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_recv_msg *msg);
/*
* When we are scanning the channels for an SMI, this will
* tell which channel we are scanning.
*/
int curr_channel;
/* Channel information */
struct ipmi_channel channels[IPMI_MAX_CHANNELS];
/* Proc FS stuff. */
struct proc_dir_entry *proc_dir;
char proc_dir_name[10];
atomic_t stats[IPMI_NUM_STATS];
/*
* run_to_completion duplicate of smb_info, smi_info
* and ipmi_serial_info structures. Used to decrease numbers of
* parameters passed by "low" level IPMI code.
*/
int run_to_completion;
};
#define to_si_intf_from_dev(device) container_of(device, struct ipmi_smi, dev)
/**
* The driver model view of the IPMI messaging driver.
*/
static struct platform_driver ipmidriver = {
.driver = {
.name = "ipmi",
.bus = &platform_bus_type
}
};
static DEFINE_MUTEX(ipmidriver_mutex);
static LIST_HEAD(ipmi_interfaces);
static DEFINE_MUTEX(ipmi_interfaces_mutex);
/*
* List of watchers that want to know when smi's are added and deleted.
*/
static LIST_HEAD(smi_watchers);
static DEFINE_MUTEX(smi_watchers_mutex);
#define ipmi_inc_stat(intf, stat) \
atomic_inc(&(intf)->stats[IPMI_STAT_ ## stat])
#define ipmi_get_stat(intf, stat) \
((unsigned int) atomic_read(&(intf)->stats[IPMI_STAT_ ## stat]))
static const char * const addr_src_to_str[] = {
"invalid", "hotmod", "hardcoded", "SPMI", "ACPI", "SMBIOS", "PCI",
"device-tree"
};
const char *ipmi_addr_src_to_str(enum ipmi_addr_src src)
{
if (src >= SI_LAST)
src = 0; /* Invalid */
return addr_src_to_str[src];
}
EXPORT_SYMBOL(ipmi_addr_src_to_str);
static int is_lan_addr(struct ipmi_addr *addr)
{
return addr->addr_type == IPMI_LAN_ADDR_TYPE;
}
static int is_ipmb_addr(struct ipmi_addr *addr)
{
return addr->addr_type == IPMI_IPMB_ADDR_TYPE;
}
static int is_ipmb_bcast_addr(struct ipmi_addr *addr)
{
return addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE;
}
static void free_recv_msg_list(struct list_head *q)
{
struct ipmi_recv_msg *msg, *msg2;
list_for_each_entry_safe(msg, msg2, q, link) {
list_del(&msg->link);
ipmi_free_recv_msg(msg);
}
}
static void free_smi_msg_list(struct list_head *q)
{
struct ipmi_smi_msg *msg, *msg2;
list_for_each_entry_safe(msg, msg2, q, link) {
list_del(&msg->link);
ipmi_free_smi_msg(msg);
}
}
static void clean_up_interface_data(ipmi_smi_t intf)
{
int i;
struct cmd_rcvr *rcvr, *rcvr2;
struct list_head list;
tasklet_kill(&intf->recv_tasklet);
free_smi_msg_list(&intf->waiting_rcv_msgs);
free_recv_msg_list(&intf->waiting_events);
/*
* Wholesale remove all the entries from the list in the
* interface and wait for RCU to know that none are in use.
*/
mutex_lock(&intf->cmd_rcvrs_mutex);
INIT_LIST_HEAD(&list);
list_splice_init_rcu(&intf->cmd_rcvrs, &list, synchronize_rcu);
mutex_unlock(&intf->cmd_rcvrs_mutex);
list_for_each_entry_safe(rcvr, rcvr2, &list, link)
kfree(rcvr);
for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
if ((intf->seq_table[i].inuse)
&& (intf->seq_table[i].recv_msg))
ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
}
}
static void intf_free(struct kref *ref)
{
ipmi_smi_t intf = container_of(ref, struct ipmi_smi, refcount);
clean_up_interface_data(intf);
kfree(intf);
}
struct watcher_entry {
int intf_num;
ipmi_smi_t intf;
struct list_head link;
};
int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher)
{
ipmi_smi_t intf;
LIST_HEAD(to_deliver);
struct watcher_entry *e, *e2;
mutex_lock(&smi_watchers_mutex);
mutex_lock(&ipmi_interfaces_mutex);
/* Build a list of things to deliver. */
list_for_each_entry(intf, &ipmi_interfaces, link) {
if (intf->intf_num == -1)
continue;
e = kmalloc(sizeof(*e), GFP_KERNEL);
if (!e)
goto out_err;
kref_get(&intf->refcount);
e->intf = intf;
e->intf_num = intf->intf_num;
list_add_tail(&e->link, &to_deliver);
}
/* We will succeed, so add it to the list. */
list_add(&watcher->link, &smi_watchers);
mutex_unlock(&ipmi_interfaces_mutex);
list_for_each_entry_safe(e, e2, &to_deliver, link) {
list_del(&e->link);
watcher->new_smi(e->intf_num, e->intf->si_dev);
kref_put(&e->intf->refcount, intf_free);
kfree(e);
}
mutex_unlock(&smi_watchers_mutex);
return 0;
out_err:
mutex_unlock(&ipmi_interfaces_mutex);
mutex_unlock(&smi_watchers_mutex);
list_for_each_entry_safe(e, e2, &to_deliver, link) {
list_del(&e->link);
kref_put(&e->intf->refcount, intf_free);
kfree(e);
}
return -ENOMEM;
}
EXPORT_SYMBOL(ipmi_smi_watcher_register);
int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher)
{
mutex_lock(&smi_watchers_mutex);
list_del(&(watcher->link));
mutex_unlock(&smi_watchers_mutex);
return 0;
}
EXPORT_SYMBOL(ipmi_smi_watcher_unregister);
/*
* Must be called with smi_watchers_mutex held.
*/
static void
call_smi_watchers(int i, struct device *dev)
{
struct ipmi_smi_watcher *w;
list_for_each_entry(w, &smi_watchers, link) {
if (try_module_get(w->owner)) {
w->new_smi(i, dev);
module_put(w->owner);
}
}
}
static int
ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2)
{
if (addr1->addr_type != addr2->addr_type)
return 0;
if (addr1->channel != addr2->channel)
return 0;
if (addr1->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
struct ipmi_system_interface_addr *smi_addr1
= (struct ipmi_system_interface_addr *) addr1;
struct ipmi_system_interface_addr *smi_addr2
= (struct ipmi_system_interface_addr *) addr2;
return (smi_addr1->lun == smi_addr2->lun);
}
if (is_ipmb_addr(addr1) || is_ipmb_bcast_addr(addr1)) {
struct ipmi_ipmb_addr *ipmb_addr1
= (struct ipmi_ipmb_addr *) addr1;
struct ipmi_ipmb_addr *ipmb_addr2
= (struct ipmi_ipmb_addr *) addr2;
return ((ipmb_addr1->slave_addr == ipmb_addr2->slave_addr)
&& (ipmb_addr1->lun == ipmb_addr2->lun));
}
if (is_lan_addr(addr1)) {
struct ipmi_lan_addr *lan_addr1
= (struct ipmi_lan_addr *) addr1;
struct ipmi_lan_addr *lan_addr2
= (struct ipmi_lan_addr *) addr2;
return ((lan_addr1->remote_SWID == lan_addr2->remote_SWID)
&& (lan_addr1->local_SWID == lan_addr2->local_SWID)
&& (lan_addr1->session_handle
== lan_addr2->session_handle)
&& (lan_addr1->lun == lan_addr2->lun));
}
return 1;
}
int ipmi_validate_addr(struct ipmi_addr *addr, int len)
{
if (len < sizeof(struct ipmi_system_interface_addr))
return -EINVAL;
if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
if (addr->channel != IPMI_BMC_CHANNEL)
return -EINVAL;
return 0;
}
if ((addr->channel == IPMI_BMC_CHANNEL)
|| (addr->channel >= IPMI_MAX_CHANNELS)
|| (addr->channel < 0))
return -EINVAL;
if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
if (len < sizeof(struct ipmi_ipmb_addr))
return -EINVAL;
return 0;
}
if (is_lan_addr(addr)) {
if (len < sizeof(struct ipmi_lan_addr))
return -EINVAL;
return 0;
}
return -EINVAL;
}
EXPORT_SYMBOL(ipmi_validate_addr);
unsigned int ipmi_addr_length(int addr_type)
{
if (addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
return sizeof(struct ipmi_system_interface_addr);
if ((addr_type == IPMI_IPMB_ADDR_TYPE)
|| (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
return sizeof(struct ipmi_ipmb_addr);
if (addr_type == IPMI_LAN_ADDR_TYPE)
return sizeof(struct ipmi_lan_addr);
return 0;
}
EXPORT_SYMBOL(ipmi_addr_length);
static void deliver_response(struct ipmi_recv_msg *msg)
{
if (!msg->user) {
ipmi_smi_t intf = msg->user_msg_data;
/* Special handling for NULL users. */
if (intf->null_user_handler) {
intf->null_user_handler(intf, msg);
ipmi_inc_stat(intf, handled_local_responses);
} else {
/* No handler, so give up. */
ipmi_inc_stat(intf, unhandled_local_responses);
}
ipmi_free_recv_msg(msg);
} else if (!oops_in_progress) {
/*
* If we are running in the panic context, calling the
* receive handler doesn't much meaning and has a deadlock
* risk. At this moment, simply skip it in that case.
*/
ipmi_user_t user = msg->user;
user->handler->ipmi_recv_hndl(msg, user->handler_data);
}
}
static void
deliver_err_response(struct ipmi_recv_msg *msg, int err)
{
msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
msg->msg_data[0] = err;
msg->msg.netfn |= 1; /* Convert to a response. */
msg->msg.data_len = 1;
msg->msg.data = msg->msg_data;
deliver_response(msg);
}
/*
* Find the next sequence number not being used and add the given
* message with the given timeout to the sequence table. This must be
* called with the interface's seq_lock held.
*/
static int intf_next_seq(ipmi_smi_t intf,
struct ipmi_recv_msg *recv_msg,
unsigned long timeout,
int retries,
int broadcast,
unsigned char *seq,
long *seqid)
{
int rv = 0;
unsigned int i;
for (i = intf->curr_seq; (i+1)%IPMI_IPMB_NUM_SEQ != intf->curr_seq;
i = (i+1)%IPMI_IPMB_NUM_SEQ) {
if (!intf->seq_table[i].inuse)
break;
}
if (!intf->seq_table[i].inuse) {
intf->seq_table[i].recv_msg = recv_msg;
/*
* Start with the maximum timeout, when the send response
* comes in we will start the real timer.
*/
intf->seq_table[i].timeout = MAX_MSG_TIMEOUT;
intf->seq_table[i].orig_timeout = timeout;
intf->seq_table[i].retries_left = retries;
intf->seq_table[i].broadcast = broadcast;
intf->seq_table[i].inuse = 1;
intf->seq_table[i].seqid = NEXT_SEQID(intf->seq_table[i].seqid);
*seq = i;
*seqid = intf->seq_table[i].seqid;
intf->curr_seq = (i+1)%IPMI_IPMB_NUM_SEQ;
need_waiter(intf);
} else {
rv = -EAGAIN;
}
return rv;
}
/*
* Return the receive message for the given sequence number and
* release the sequence number so it can be reused. Some other data
* is passed in to be sure the message matches up correctly (to help
* guard against message coming in after their timeout and the
* sequence number being reused).
*/
static int intf_find_seq(ipmi_smi_t intf,
unsigned char seq,
short channel,
unsigned char cmd,
unsigned char netfn,
struct ipmi_addr *addr,
struct ipmi_recv_msg **recv_msg)
{
int rv = -ENODEV;
unsigned long flags;
if (seq >= IPMI_IPMB_NUM_SEQ)
return -EINVAL;
spin_lock_irqsave(&(intf->seq_lock), flags);
if (intf->seq_table[seq].inuse) {
struct ipmi_recv_msg *msg = intf->seq_table[seq].recv_msg;
if ((msg->addr.channel == channel) && (msg->msg.cmd == cmd)
&& (msg->msg.netfn == netfn)
&& (ipmi_addr_equal(addr, &(msg->addr)))) {
*recv_msg = msg;
intf->seq_table[seq].inuse = 0;
rv = 0;
}
}
spin_unlock_irqrestore(&(intf->seq_lock), flags);
return rv;
}
/* Start the timer for a specific sequence table entry. */
static int intf_start_seq_timer(ipmi_smi_t intf,
long msgid)
{
int rv = -ENODEV;
unsigned long flags;
unsigned char seq;
unsigned long seqid;
GET_SEQ_FROM_MSGID(msgid, seq, seqid);
spin_lock_irqsave(&(intf->seq_lock), flags);
/*
* We do this verification because the user can be deleted
* while a message is outstanding.
*/
if ((intf->seq_table[seq].inuse)
&& (intf->seq_table[seq].seqid == seqid)) {
struct seq_table *ent = &(intf->seq_table[seq]);
ent->timeout = ent->orig_timeout;
rv = 0;
}
spin_unlock_irqrestore(&(intf->seq_lock), flags);
return rv;
}
/* Got an error for the send message for a specific sequence number. */
static int intf_err_seq(ipmi_smi_t intf,
long msgid,
unsigned int err)
{
int rv = -ENODEV;
unsigned long flags;
unsigned char seq;
unsigned long seqid;
struct ipmi_recv_msg *msg = NULL;
GET_SEQ_FROM_MSGID(msgid, seq, seqid);
spin_lock_irqsave(&(intf->seq_lock), flags);
/*
* We do this verification because the user can be deleted
* while a message is outstanding.
*/
if ((intf->seq_table[seq].inuse)
&& (intf->seq_table[seq].seqid == seqid)) {
struct seq_table *ent = &(intf->seq_table[seq]);
ent->inuse = 0;
msg = ent->recv_msg;
rv = 0;
}
spin_unlock_irqrestore(&(intf->seq_lock), flags);
if (msg)
deliver_err_response(msg, err);
return rv;
}
int ipmi_create_user(unsigned int if_num,
const struct ipmi_user_hndl *handler,
void *handler_data,
ipmi_user_t *user)
{
unsigned long flags;
ipmi_user_t new_user;
int rv = 0;
ipmi_smi_t intf;
/*
* There is no module usecount here, because it's not
* required. Since this can only be used by and called from
* other modules, they will implicitly use this module, and
* thus this can't be removed unless the other modules are
* removed.
*/
if (handler == NULL)
return -EINVAL;
/*
* Make sure the driver is actually initialized, this handles
* problems with initialization order.
*/
if (!initialized) {
rv = ipmi_init_msghandler();
if (rv)
return rv;
/*
* The init code doesn't return an error if it was turned
* off, but it won't initialize. Check that.
*/
if (!initialized)
return -ENODEV;
}
new_user = kmalloc(sizeof(*new_user), GFP_KERNEL);
if (!new_user)
return -ENOMEM;
mutex_lock(&ipmi_interfaces_mutex);
list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
if (intf->intf_num == if_num)
goto found;
}
/* Not found, return an error */
rv = -EINVAL;
goto out_kfree;
found:
/* Note that each existing user holds a refcount to the interface. */
kref_get(&intf->refcount);
kref_init(&new_user->refcount);
new_user->handler = handler;
new_user->handler_data = handler_data;
new_user->intf = intf;
new_user->gets_events = false;
if (!try_module_get(intf->handlers->owner)) {
rv = -ENODEV;
goto out_kref;
}
if (intf->handlers->inc_usecount) {
rv = intf->handlers->inc_usecount(intf->send_info);
if (rv) {
module_put(intf->handlers->owner);
goto out_kref;
}
}
/*
* Hold the lock so intf->handlers is guaranteed to be good
* until now
*/
mutex_unlock(&ipmi_interfaces_mutex);
new_user->valid = true;
spin_lock_irqsave(&intf->seq_lock, flags);
list_add_rcu(&new_user->link, &intf->users);
spin_unlock_irqrestore(&intf->seq_lock, flags);
if (handler->ipmi_watchdog_pretimeout) {
/* User wants pretimeouts, so make sure to watch for them. */
if (atomic_inc_return(&intf->event_waiters) == 1)
need_waiter(intf);
}
*user = new_user;
return 0;
out_kref:
kref_put(&intf->refcount, intf_free);
out_kfree:
mutex_unlock(&ipmi_interfaces_mutex);
kfree(new_user);
return rv;
}
EXPORT_SYMBOL(ipmi_create_user);
int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data)
{
int rv = 0;
ipmi_smi_t intf;
const struct ipmi_smi_handlers *handlers;
mutex_lock(&ipmi_interfaces_mutex);
list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
if (intf->intf_num == if_num)
goto found;
}
/* Not found, return an error */
rv = -EINVAL;
mutex_unlock(&ipmi_interfaces_mutex);
return rv;
found:
handlers = intf->handlers;
rv = -ENOSYS;
if (handlers->get_smi_info)
rv = handlers->get_smi_info(intf->send_info, data);
mutex_unlock(&ipmi_interfaces_mutex);
return rv;
}
EXPORT_SYMBOL(ipmi_get_smi_info);
static void free_user(struct kref *ref)
{
ipmi_user_t user = container_of(ref, struct ipmi_user, refcount);
kfree(user);
}
int ipmi_destroy_user(ipmi_user_t user)
{
ipmi_smi_t intf = user->intf;
int i;
unsigned long flags;
struct cmd_rcvr *rcvr;
struct cmd_rcvr *rcvrs = NULL;
user->valid = false;
if (user->handler->ipmi_watchdog_pretimeout)
atomic_dec(&intf->event_waiters);
if (user->gets_events)
atomic_dec(&intf->event_waiters);
/* Remove the user from the interface's sequence table. */
spin_lock_irqsave(&intf->seq_lock, flags);
list_del_rcu(&user->link);
for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
if (intf->seq_table[i].inuse
&& (intf->seq_table[i].recv_msg->user == user)) {
intf->seq_table[i].inuse = 0;
ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
}
}
spin_unlock_irqrestore(&intf->seq_lock, flags);
/*
* Remove the user from the command receiver's table. First
* we build a list of everything (not using the standard link,
* since other things may be using it till we do
* synchronize_rcu()) then free everything in that list.
*/
mutex_lock(&intf->cmd_rcvrs_mutex);
list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
if (rcvr->user == user) {
list_del_rcu(&rcvr->link);
rcvr->next = rcvrs;
rcvrs = rcvr;
}
}
mutex_unlock(&intf->cmd_rcvrs_mutex);
synchronize_rcu();
while (rcvrs) {
rcvr = rcvrs;
rcvrs = rcvr->next;
kfree(rcvr);
}
mutex_lock(&ipmi_interfaces_mutex);
if (intf->handlers) {
module_put(intf->handlers->owner);
if (intf->handlers->dec_usecount)
intf->handlers->dec_usecount(intf->send_info);
}
mutex_unlock(&ipmi_interfaces_mutex);
kref_put(&intf->refcount, intf_free);
kref_put(&user->refcount, free_user);
return 0;
}
EXPORT_SYMBOL(ipmi_destroy_user);
void ipmi_get_version(ipmi_user_t user,
unsigned char *major,
unsigned char *minor)
{
*major = user->intf->ipmi_version_major;
*minor = user->intf->ipmi_version_minor;
}
EXPORT_SYMBOL(ipmi_get_version);
int ipmi_set_my_address(ipmi_user_t user,
unsigned int channel,
unsigned char address)
{
if (channel >= IPMI_MAX_CHANNELS)
return -EINVAL;
user->intf->channels[channel].address = address;
return 0;
}
EXPORT_SYMBOL(ipmi_set_my_address);
int ipmi_get_my_address(ipmi_user_t user,
unsigned int channel,
unsigned char *address)
{
if (channel >= IPMI_MAX_CHANNELS)
return -EINVAL;
*address = user->intf->channels[channel].address;
return 0;
}
EXPORT_SYMBOL(ipmi_get_my_address);
int ipmi_set_my_LUN(ipmi_user_t user,
unsigned int channel,
unsigned char LUN)
{
if (channel >= IPMI_MAX_CHANNELS)
return -EINVAL;
user->intf->channels[channel].lun = LUN & 0x3;
return 0;
}
EXPORT_SYMBOL(ipmi_set_my_LUN);
int ipmi_get_my_LUN(ipmi_user_t user,
unsigned int channel,
unsigned char *address)
{
if (channel >= IPMI_MAX_CHANNELS)
return -EINVAL;
*address = user->intf->channels[channel].lun;
return 0;
}
EXPORT_SYMBOL(ipmi_get_my_LUN);
int ipmi_get_maintenance_mode(ipmi_user_t user)
{
int mode;
unsigned long flags;
spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags);
mode = user->intf->maintenance_mode;
spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags);
return mode;
}
EXPORT_SYMBOL(ipmi_get_maintenance_mode);
static void maintenance_mode_update(ipmi_smi_t intf)
{
if (intf->handlers->set_maintenance_mode)
intf->handlers->set_maintenance_mode(
intf->send_info, intf->maintenance_mode_enable);
}
int ipmi_set_maintenance_mode(ipmi_user_t user, int mode)
{
int rv = 0;
unsigned long flags;
ipmi_smi_t intf = user->intf;
spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
if (intf->maintenance_mode != mode) {
switch (mode) {
case IPMI_MAINTENANCE_MODE_AUTO:
intf->maintenance_mode_enable
= (intf->auto_maintenance_timeout > 0);
break;
case IPMI_MAINTENANCE_MODE_OFF:
intf->maintenance_mode_enable = false;
break;
case IPMI_MAINTENANCE_MODE_ON:
intf->maintenance_mode_enable = true;
break;
default:
rv = -EINVAL;
goto out_unlock;
}
intf->maintenance_mode = mode;
maintenance_mode_update(intf);
}
out_unlock:
spin_unlock_irqrestore(&intf->maintenance_mode_lock, flags);
return rv;
}
EXPORT_SYMBOL(ipmi_set_maintenance_mode);
int ipmi_set_gets_events(ipmi_user_t user, bool val)
{
unsigned long flags;
ipmi_smi_t intf = user->intf;
struct ipmi_recv_msg *msg, *msg2;
struct list_head msgs;
INIT_LIST_HEAD(&msgs);
spin_lock_irqsave(&intf->events_lock, flags);
if (user->gets_events == val)
goto out;
user->gets_events = val;
if (val) {
if (atomic_inc_return(&intf->event_waiters) == 1)
need_waiter(intf);
} else {
atomic_dec(&intf->event_waiters);
}
if (intf->delivering_events)
/*
* Another thread is delivering events for this, so
* let it handle any new events.
*/
goto out;
/* Deliver any queued events. */
while (user->gets_events && !list_empty(&intf->waiting_events)) {
list_for_each_entry_safe(msg, msg2, &intf->waiting_events, link)
list_move_tail(&msg->link, &msgs);
intf->waiting_events_count = 0;
if (intf->event_msg_printed) {
printk(KERN_WARNING PFX "Event queue no longer"
" full\n");
intf->event_msg_printed = 0;
}
intf->delivering_events = 1;
spin_unlock_irqrestore(&intf->events_lock, flags);
list_for_each_entry_safe(msg, msg2, &msgs, link) {
msg->user = user;
kref_get(&user->refcount);
deliver_response(msg);
}
spin_lock_irqsave(&intf->events_lock, flags);
intf->delivering_events = 0;
}
out:
spin_unlock_irqrestore(&intf->events_lock, flags);
return 0;
}
EXPORT_SYMBOL(ipmi_set_gets_events);
static struct cmd_rcvr *find_cmd_rcvr(ipmi_smi_t intf,
unsigned char netfn,
unsigned char cmd,
unsigned char chan)
{
struct cmd_rcvr *rcvr;
list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
&& (rcvr->chans & (1 << chan)))
return rcvr;
}
return NULL;
}
static int is_cmd_rcvr_exclusive(ipmi_smi_t intf,
unsigned char netfn,
unsigned char cmd,
unsigned int chans)
{
struct cmd_rcvr *rcvr;
list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
&& (rcvr->chans & chans))
return 0;
}
return 1;
}
int ipmi_register_for_cmd(ipmi_user_t user,
unsigned char netfn,
unsigned char cmd,
unsigned int chans)
{
ipmi_smi_t intf = user->intf;
struct cmd_rcvr *rcvr;
int rv = 0;
rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL);
if (!rcvr)
return -ENOMEM;
rcvr->cmd = cmd;
rcvr->netfn = netfn;
rcvr->chans = chans;
rcvr->user = user;
mutex_lock(&intf->cmd_rcvrs_mutex);
/* Make sure the command/netfn is not already registered. */
if (!is_cmd_rcvr_exclusive(intf, netfn, cmd, chans)) {
rv = -EBUSY;
goto out_unlock;
}
if (atomic_inc_return(&intf->event_waiters) == 1)
need_waiter(intf);
list_add_rcu(&rcvr->link, &intf->cmd_rcvrs);
out_unlock:
mutex_unlock(&intf->cmd_rcvrs_mutex);
if (rv)
kfree(rcvr);
return rv;
}
EXPORT_SYMBOL(ipmi_register_for_cmd);
int ipmi_unregister_for_cmd(ipmi_user_t user,
unsigned char netfn,
unsigned char cmd,
unsigned int chans)
{
ipmi_smi_t intf = user->intf;
struct cmd_rcvr *rcvr;
struct cmd_rcvr *rcvrs = NULL;
int i, rv = -ENOENT;
mutex_lock(&intf->cmd_rcvrs_mutex);
for (i = 0; i < IPMI_NUM_CHANNELS; i++) {
if (((1 << i) & chans) == 0)
continue;
rcvr = find_cmd_rcvr(intf, netfn, cmd, i);
if (rcvr == NULL)
continue;
if (rcvr->user == user) {
rv = 0;
rcvr->chans &= ~chans;
if (rcvr->chans == 0) {
list_del_rcu(&rcvr->link);
rcvr->next = rcvrs;
rcvrs = rcvr;
}
}
}
mutex_unlock(&intf->cmd_rcvrs_mutex);
synchronize_rcu();
while (rcvrs) {
atomic_dec(&intf->event_waiters);
rcvr = rcvrs;
rcvrs = rcvr->next;
kfree(rcvr);
}
return rv;
}
EXPORT_SYMBOL(ipmi_unregister_for_cmd);
static unsigned char
ipmb_checksum(unsigned char *data, int size)
{
unsigned char csum = 0;
for (; size > 0; size--, data++)
csum += *data;
return -csum;
}
static inline void format_ipmb_msg(struct ipmi_smi_msg *smi_msg,
struct kernel_ipmi_msg *msg,
struct ipmi_ipmb_addr *ipmb_addr,
long msgid,
unsigned char ipmb_seq,
int broadcast,
unsigned char source_address,
unsigned char source_lun)
{
int i = broadcast;
/* Format the IPMB header data. */
smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
smi_msg->data[1] = IPMI_SEND_MSG_CMD;
smi_msg->data[2] = ipmb_addr->channel;
if (broadcast)
smi_msg->data[3] = 0;
smi_msg->data[i+3] = ipmb_addr->slave_addr;
smi_msg->data[i+4] = (msg->netfn << 2) | (ipmb_addr->lun & 0x3);
smi_msg->data[i+5] = ipmb_checksum(&(smi_msg->data[i+3]), 2);
smi_msg->data[i+6] = source_address;
smi_msg->data[i+7] = (ipmb_seq << 2) | source_lun;
smi_msg->data[i+8] = msg->cmd;
/* Now tack on the data to the message. */
if (msg->data_len > 0)
memcpy(&(smi_msg->data[i+9]), msg->data,
msg->data_len);
smi_msg->data_size = msg->data_len + 9;
/* Now calculate the checksum and tack it on. */
smi_msg->data[i+smi_msg->data_size]
= ipmb_checksum(&(smi_msg->data[i+6]),
smi_msg->data_size-6);
/*
* Add on the checksum size and the offset from the
* broadcast.
*/
smi_msg->data_size += 1 + i;
smi_msg->msgid = msgid;
}
static inline void format_lan_msg(struct ipmi_smi_msg *smi_msg,
struct kernel_ipmi_msg *msg,
struct ipmi_lan_addr *lan_addr,
long msgid,
unsigned char ipmb_seq,
unsigned char source_lun)
{
/* Format the IPMB header data. */
smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
smi_msg->data[1] = IPMI_SEND_MSG_CMD;
smi_msg->data[2] = lan_addr->channel;
smi_msg->data[3] = lan_addr->session_handle;
smi_msg->data[4] = lan_addr->remote_SWID;
smi_msg->data[5] = (msg->netfn << 2) | (lan_addr->lun & 0x3);
smi_msg->data[6] = ipmb_checksum(&(smi_msg->data[4]), 2);
smi_msg->data[7] = lan_addr->local_SWID;
smi_msg->data[8] = (ipmb_seq << 2) | source_lun;
smi_msg->data[9] = msg->cmd;
/* Now tack on the data to the message. */
if (msg->data_len > 0)
memcpy(&(smi_msg->data[10]), msg->data,
msg->data_len);
smi_msg->data_size = msg->data_len + 10;
/* Now calculate the checksum and tack it on. */
smi_msg->data[smi_msg->data_size]
= ipmb_checksum(&(smi_msg->data[7]),
smi_msg->data_size-7);
/*
* Add on the checksum size and the offset from the
* broadcast.
*/
smi_msg->data_size += 1;
smi_msg->msgid = msgid;
}
static struct ipmi_smi_msg *smi_add_send_msg(ipmi_smi_t intf,
struct ipmi_smi_msg *smi_msg,
int priority)
{
if (intf->curr_msg) {
if (priority > 0)
list_add_tail(&smi_msg->link, &intf->hp_xmit_msgs);
else
list_add_tail(&smi_msg->link, &intf->xmit_msgs);
smi_msg = NULL;
} else {
intf->curr_msg = smi_msg;
}
return smi_msg;
}
static void smi_send(ipmi_smi_t intf, const struct ipmi_smi_handlers *handlers,
struct ipmi_smi_msg *smi_msg, int priority)
{
int run_to_completion = intf->run_to_completion;
if (run_to_completion) {
smi_msg = smi_add_send_msg(intf, smi_msg, priority);
} else {
unsigned long flags;
spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
smi_msg = smi_add_send_msg(intf, smi_msg, priority);
spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
}
if (smi_msg)
handlers->sender(intf->send_info, smi_msg);
}
/*
* Separate from ipmi_request so that the user does not have to be
* supplied in certain circumstances (mainly at panic time). If
* messages are supplied, they will be freed, even if an error
* occurs.
*/
static int i_ipmi_request(ipmi_user_t user,
ipmi_smi_t intf,
struct ipmi_addr *addr,
long msgid,
struct kernel_ipmi_msg *msg,
void *user_msg_data,
void *supplied_smi,
struct ipmi_recv_msg *supplied_recv,
int priority,
unsigned char source_address,
unsigned char source_lun,
int retries,
unsigned int retry_time_ms)
{
int rv = 0;
struct ipmi_smi_msg *smi_msg;
struct ipmi_recv_msg *recv_msg;
unsigned long flags;
if (supplied_recv)
recv_msg = supplied_recv;
else {
recv_msg = ipmi_alloc_recv_msg();
if (recv_msg == NULL)
return -ENOMEM;
}
recv_msg->user_msg_data = user_msg_data;
if (supplied_smi)
smi_msg = (struct ipmi_smi_msg *) supplied_smi;
else {
smi_msg = ipmi_alloc_smi_msg();
if (smi_msg == NULL) {
ipmi_free_recv_msg(recv_msg);
return -ENOMEM;
}
}
rcu_read_lock();
if (intf->in_shutdown) {
rv = -ENODEV;
goto out_err;
}
recv_msg->user = user;
if (user)
kref_get(&user->refcount);
recv_msg->msgid = msgid;
/*
* Store the message to send in the receive message so timeout
* responses can get the proper response data.
*/
recv_msg->msg = *msg;
if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
struct ipmi_system_interface_addr *smi_addr;
if (msg->netfn & 1) {
/* Responses are not allowed to the SMI. */
rv = -EINVAL;
goto out_err;
}
smi_addr = (struct ipmi_system_interface_addr *) addr;
if (smi_addr->lun > 3) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
memcpy(&recv_msg->addr, smi_addr, sizeof(*smi_addr));
if ((msg->netfn == IPMI_NETFN_APP_REQUEST)
&& ((msg->cmd == IPMI_SEND_MSG_CMD)
|| (msg->cmd == IPMI_GET_MSG_CMD)
|| (msg->cmd == IPMI_READ_EVENT_MSG_BUFFER_CMD))) {
/*
* We don't let the user do these, since we manage
* the sequence numbers.
*/
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
if (((msg->netfn == IPMI_NETFN_APP_REQUEST)
&& ((msg->cmd == IPMI_COLD_RESET_CMD)
|| (msg->cmd == IPMI_WARM_RESET_CMD)))
|| (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST)) {
spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
intf->auto_maintenance_timeout
= IPMI_MAINTENANCE_MODE_TIMEOUT;
if (!intf->maintenance_mode
&& !intf->maintenance_mode_enable) {
intf->maintenance_mode_enable = true;
maintenance_mode_update(intf);
}
spin_unlock_irqrestore(&intf->maintenance_mode_lock,
flags);
}
if ((msg->data_len + 2) > IPMI_MAX_MSG_LENGTH) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EMSGSIZE;
goto out_err;
}
smi_msg->data[0] = (msg->netfn << 2) | (smi_addr->lun & 0x3);
smi_msg->data[1] = msg->cmd;
smi_msg->msgid = msgid;
smi_msg->user_data = recv_msg;
if (msg->data_len > 0)
memcpy(&(smi_msg->data[2]), msg->data, msg->data_len);
smi_msg->data_size = msg->data_len + 2;
ipmi_inc_stat(intf, sent_local_commands);
} else if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
struct ipmi_ipmb_addr *ipmb_addr;
unsigned char ipmb_seq;
long seqid;
int broadcast = 0;
if (addr->channel >= IPMI_MAX_CHANNELS) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
if (intf->channels[addr->channel].medium
!= IPMI_CHANNEL_MEDIUM_IPMB) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
if (retries < 0) {
if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)
retries = 0; /* Don't retry broadcasts. */
else
retries = 4;
}
if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) {
/*
* Broadcasts add a zero at the beginning of the
* message, but otherwise is the same as an IPMB
* address.
*/
addr->addr_type = IPMI_IPMB_ADDR_TYPE;
broadcast = 1;
}
/* Default to 1 second retries. */
if (retry_time_ms == 0)
retry_time_ms = 1000;
/*
* 9 for the header and 1 for the checksum, plus
* possibly one for the broadcast.
*/
if ((msg->data_len + 10 + broadcast) > IPMI_MAX_MSG_LENGTH) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EMSGSIZE;
goto out_err;
}
ipmb_addr = (struct ipmi_ipmb_addr *) addr;
if (ipmb_addr->lun > 3) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
memcpy(&recv_msg->addr, ipmb_addr, sizeof(*ipmb_addr));
if (recv_msg->msg.netfn & 0x1) {
/*
* It's a response, so use the user's sequence
* from msgid.
*/
ipmi_inc_stat(intf, sent_ipmb_responses);
format_ipmb_msg(smi_msg, msg, ipmb_addr, msgid,
msgid, broadcast,
source_address, source_lun);
/*
* Save the receive message so we can use it
* to deliver the response.
*/
smi_msg->user_data = recv_msg;
} else {
/* It's a command, so get a sequence for it. */
spin_lock_irqsave(&(intf->seq_lock), flags);
/*
* Create a sequence number with a 1 second
* timeout and 4 retries.
*/
rv = intf_next_seq(intf,
recv_msg,
retry_time_ms,
retries,
broadcast,
&ipmb_seq,
&seqid);
if (rv) {
/*
* We have used up all the sequence numbers,
* probably, so abort.
*/
spin_unlock_irqrestore(&(intf->seq_lock),
flags);
goto out_err;
}
ipmi_inc_stat(intf, sent_ipmb_commands);
/*
* Store the sequence number in the message,
* so that when the send message response
* comes back we can start the timer.
*/
format_ipmb_msg(smi_msg, msg, ipmb_addr,
STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
ipmb_seq, broadcast,
source_address, source_lun);
/*
* Copy the message into the recv message data, so we
* can retransmit it later if necessary.
*/
memcpy(recv_msg->msg_data, smi_msg->data,
smi_msg->data_size);
recv_msg->msg.data = recv_msg->msg_data;
recv_msg->msg.data_len = smi_msg->data_size;
/*
* We don't unlock until here, because we need
* to copy the completed message into the
* recv_msg before we release the lock.
* Otherwise, race conditions may bite us. I
* know that's pretty paranoid, but I prefer
* to be correct.
*/
spin_unlock_irqrestore(&(intf->seq_lock), flags);
}
} else if (is_lan_addr(addr)) {
struct ipmi_lan_addr *lan_addr;
unsigned char ipmb_seq;
long seqid;
if (addr->channel >= IPMI_MAX_CHANNELS) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
if ((intf->channels[addr->channel].medium
!= IPMI_CHANNEL_MEDIUM_8023LAN)
&& (intf->channels[addr->channel].medium
!= IPMI_CHANNEL_MEDIUM_ASYNC)) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
retries = 4;
/* Default to 1 second retries. */
if (retry_time_ms == 0)
retry_time_ms = 1000;
/* 11 for the header and 1 for the checksum. */
if ((msg->data_len + 12) > IPMI_MAX_MSG_LENGTH) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EMSGSIZE;
goto out_err;
}
lan_addr = (struct ipmi_lan_addr *) addr;
if (lan_addr->lun > 3) {
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
memcpy(&recv_msg->addr, lan_addr, sizeof(*lan_addr));
if (recv_msg->msg.netfn & 0x1) {
/*
* It's a response, so use the user's sequence
* from msgid.
*/
ipmi_inc_stat(intf, sent_lan_responses);
format_lan_msg(smi_msg, msg, lan_addr, msgid,
msgid, source_lun);
/*
* Save the receive message so we can use it
* to deliver the response.
*/
smi_msg->user_data = recv_msg;
} else {
/* It's a command, so get a sequence for it. */
spin_lock_irqsave(&(intf->seq_lock), flags);
/*
* Create a sequence number with a 1 second
* timeout and 4 retries.
*/
rv = intf_next_seq(intf,
recv_msg,
retry_time_ms,
retries,
0,
&ipmb_seq,
&seqid);
if (rv) {
/*
* We have used up all the sequence numbers,
* probably, so abort.
*/
spin_unlock_irqrestore(&(intf->seq_lock),
flags);
goto out_err;
}
ipmi_inc_stat(intf, sent_lan_commands);
/*
* Store the sequence number in the message,
* so that when the send message response
* comes back we can start the timer.
*/
format_lan_msg(smi_msg, msg, lan_addr,
STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
ipmb_seq, source_lun);
/*
* Copy the message into the recv message data, so we
* can retransmit it later if necessary.
*/
memcpy(recv_msg->msg_data, smi_msg->data,
smi_msg->data_size);
recv_msg->msg.data = recv_msg->msg_data;
recv_msg->msg.data_len = smi_msg->data_size;
/*
* We don't unlock until here, because we need
* to copy the completed message into the
* recv_msg before we release the lock.
* Otherwise, race conditions may bite us. I
* know that's pretty paranoid, but I prefer
* to be correct.
*/
spin_unlock_irqrestore(&(intf->seq_lock), flags);
}
} else {
/* Unknown address type. */
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
goto out_err;
}
#ifdef DEBUG_MSGING
{
int m;
for (m = 0; m < smi_msg->data_size; m++)
printk(" %2.2x", smi_msg->data[m]);
printk("\n");
}
#endif
smi_send(intf, intf->handlers, smi_msg, priority);
rcu_read_unlock();
return 0;
out_err:
rcu_read_unlock();
ipmi_free_smi_msg(smi_msg);
ipmi_free_recv_msg(recv_msg);
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,
struct kernel_ipmi_msg *msg,
void *user_msg_data,
int priority,
int retries,
unsigned int retry_time_ms)
{
unsigned char saddr = 0, lun = 0;
int rv;
if (!user)
return -EINVAL;
rv = check_addr(user->intf, addr, &saddr, &lun);
if (rv)
return rv;
return i_ipmi_request(user,
user->intf,
addr,
msgid,
msg,
user_msg_data,
NULL, NULL,
priority,
saddr,
lun,
retries,
retry_time_ms);
}
EXPORT_SYMBOL(ipmi_request_settime);
int ipmi_request_supply_msgs(ipmi_user_t user,
struct ipmi_addr *addr,
long msgid,
struct kernel_ipmi_msg *msg,
void *user_msg_data,
void *supplied_smi,
struct ipmi_recv_msg *supplied_recv,
int priority)
{
unsigned char saddr = 0, lun = 0;
int rv;
if (!user)
return -EINVAL;
rv = check_addr(user->intf, addr, &saddr, &lun);
if (rv)
return rv;
return i_ipmi_request(user,
user->intf,
addr,
msgid,
msg,
user_msg_data,
supplied_smi,
supplied_recv,
priority,
saddr,
lun,
-1, 0);
}
EXPORT_SYMBOL(ipmi_request_supply_msgs);
#ifdef CONFIG_PROC_FS
static int smi_ipmb_proc_show(struct seq_file *m, void *v)
{
ipmi_smi_t intf = m->private;
int i;
seq_printf(m, "%x", intf->channels[0].address);
for (i = 1; i < IPMI_MAX_CHANNELS; i++)
seq_printf(m, " %x", intf->channels[i].address);
seq_putc(m, '\n');
return 0;
}
static int smi_ipmb_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, smi_ipmb_proc_show, PDE_DATA(inode));
}
static const struct file_operations smi_ipmb_proc_ops = {
.open = smi_ipmb_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int smi_version_proc_show(struct seq_file *m, void *v)
{
ipmi_smi_t intf = m->private;
seq_printf(m, "%u.%u\n",
ipmi_version_major(&intf->bmc->id),
ipmi_version_minor(&intf->bmc->id));
return 0;
}
static int smi_version_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, smi_version_proc_show, PDE_DATA(inode));
}
static const struct file_operations smi_version_proc_ops = {
.open = smi_version_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int smi_stats_proc_show(struct seq_file *m, void *v)
{
ipmi_smi_t intf = m->private;
seq_printf(m, "sent_invalid_commands: %u\n",
ipmi_get_stat(intf, sent_invalid_commands));
seq_printf(m, "sent_local_commands: %u\n",
ipmi_get_stat(intf, sent_local_commands));
seq_printf(m, "handled_local_responses: %u\n",
ipmi_get_stat(intf, handled_local_responses));
seq_printf(m, "unhandled_local_responses: %u\n",
ipmi_get_stat(intf, unhandled_local_responses));
seq_printf(m, "sent_ipmb_commands: %u\n",
ipmi_get_stat(intf, sent_ipmb_commands));
seq_printf(m, "sent_ipmb_command_errs: %u\n",
ipmi_get_stat(intf, sent_ipmb_command_errs));
seq_printf(m, "retransmitted_ipmb_commands: %u\n",
ipmi_get_stat(intf, retransmitted_ipmb_commands));
seq_printf(m, "timed_out_ipmb_commands: %u\n",
ipmi_get_stat(intf, timed_out_ipmb_commands));
seq_printf(m, "timed_out_ipmb_broadcasts: %u\n",
ipmi_get_stat(intf, timed_out_ipmb_broadcasts));
seq_printf(m, "sent_ipmb_responses: %u\n",
ipmi_get_stat(intf, sent_ipmb_responses));
seq_printf(m, "handled_ipmb_responses: %u\n",
ipmi_get_stat(intf, handled_ipmb_responses));
seq_printf(m, "invalid_ipmb_responses: %u\n",
ipmi_get_stat(intf, invalid_ipmb_responses));
seq_printf(m, "unhandled_ipmb_responses: %u\n",
ipmi_get_stat(intf, unhandled_ipmb_responses));
seq_printf(m, "sent_lan_commands: %u\n",
ipmi_get_stat(intf, sent_lan_commands));
seq_printf(m, "sent_lan_command_errs: %u\n",
ipmi_get_stat(intf, sent_lan_command_errs));
seq_printf(m, "retransmitted_lan_commands: %u\n",
ipmi_get_stat(intf, retransmitted_lan_commands));
seq_printf(m, "timed_out_lan_commands: %u\n",
ipmi_get_stat(intf, timed_out_lan_commands));
seq_printf(m, "sent_lan_responses: %u\n",
ipmi_get_stat(intf, sent_lan_responses));
seq_printf(m, "handled_lan_responses: %u\n",
ipmi_get_stat(intf, handled_lan_responses));
seq_printf(m, "invalid_lan_responses: %u\n",
ipmi_get_stat(intf, invalid_lan_responses));
seq_printf(m, "unhandled_lan_responses: %u\n",
ipmi_get_stat(intf, unhandled_lan_responses));
seq_printf(m, "handled_commands: %u\n",
ipmi_get_stat(intf, handled_commands));
seq_printf(m, "invalid_commands: %u\n",
ipmi_get_stat(intf, invalid_commands));
seq_printf(m, "unhandled_commands: %u\n",
ipmi_get_stat(intf, unhandled_commands));
seq_printf(m, "invalid_events: %u\n",
ipmi_get_stat(intf, invalid_events));
seq_printf(m, "events: %u\n",
ipmi_get_stat(intf, events));
seq_printf(m, "failed rexmit LAN msgs: %u\n",
ipmi_get_stat(intf, dropped_rexmit_lan_commands));
seq_printf(m, "failed rexmit IPMB msgs: %u\n",
ipmi_get_stat(intf, dropped_rexmit_ipmb_commands));
return 0;
}
static int smi_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
}
static const struct file_operations smi_stats_proc_ops = {
.open = smi_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#endif /* CONFIG_PROC_FS */
int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
const struct file_operations *proc_ops,
void *data)
{
int rv = 0;
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *file;
struct ipmi_proc_entry *entry;
/* Create a list element. */
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->name = kstrdup(name, GFP_KERNEL);
if (!entry->name) {
kfree(entry);
return -ENOMEM;
}
file = proc_create_data(name, 0, smi->proc_dir, proc_ops, data);
if (!file) {
kfree(entry->name);
kfree(entry);
rv = -ENOMEM;
} else {
mutex_lock(&smi->proc_entry_lock);
/* Stick it on the list. */
entry->next = smi->proc_entries;
smi->proc_entries = entry;
mutex_unlock(&smi->proc_entry_lock);
}
#endif /* CONFIG_PROC_FS */
return rv;
}
EXPORT_SYMBOL(ipmi_smi_add_proc_entry);
static int add_proc_entries(ipmi_smi_t smi, int num)
{
int rv = 0;
#ifdef CONFIG_PROC_FS
sprintf(smi->proc_dir_name, "%d", num);
smi->proc_dir = proc_mkdir(smi->proc_dir_name, proc_ipmi_root);
if (!smi->proc_dir)
rv = -ENOMEM;
if (rv == 0)
rv = ipmi_smi_add_proc_entry(smi, "stats",
&smi_stats_proc_ops,
smi);
if (rv == 0)
rv = ipmi_smi_add_proc_entry(smi, "ipmb",
&smi_ipmb_proc_ops,
smi);
if (rv == 0)
rv = ipmi_smi_add_proc_entry(smi, "version",
&smi_version_proc_ops,
smi);
#endif /* CONFIG_PROC_FS */
return rv;
}
static void remove_proc_entries(ipmi_smi_t smi)
{
#ifdef CONFIG_PROC_FS
struct ipmi_proc_entry *entry;
mutex_lock(&smi->proc_entry_lock);
while (smi->proc_entries) {
entry = smi->proc_entries;
smi->proc_entries = entry->next;
remove_proc_entry(entry->name, smi->proc_dir);
kfree(entry->name);
kfree(entry);
}
mutex_unlock(&smi->proc_entry_lock);
remove_proc_entry(smi->proc_dir_name, proc_ipmi_root);
#endif /* CONFIG_PROC_FS */
}
static int __find_bmc_guid(struct device *dev, void *data)
{
unsigned char *id = data;
struct bmc_device *bmc = to_bmc_device(dev);
return memcmp(bmc->guid, id, 16) == 0;
}
static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv,
unsigned char *guid)
{
struct device *dev;
dev = driver_find_device(drv, NULL, guid, __find_bmc_guid);
if (dev)
return to_bmc_device(dev);
else
return NULL;
}
struct prod_dev_id {
unsigned int product_id;
unsigned char device_id;
};
static int __find_bmc_prod_dev_id(struct device *dev, void *data)
{
struct prod_dev_id *id = data;
struct bmc_device *bmc = to_bmc_device(dev);
return (bmc->id.product_id == id->product_id
&& bmc->id.device_id == id->device_id);
}
static struct bmc_device *ipmi_find_bmc_prod_dev_id(
struct device_driver *drv,
unsigned int product_id, unsigned char device_id)
{
struct prod_dev_id id = {
.product_id = product_id,
.device_id = device_id,
};
struct device *dev;
dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id);
if (dev)
return to_bmc_device(dev);
else
return NULL;
}
static ssize_t device_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 10, "%u\n", bmc->id.device_id);
}
static DEVICE_ATTR(device_id, S_IRUGO, device_id_show, NULL);
static ssize_t provides_device_sdrs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 10, "%u\n",
(bmc->id.device_revision & 0x80) >> 7);
}
static DEVICE_ATTR(provides_device_sdrs, S_IRUGO, provides_device_sdrs_show,
NULL);
static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 20, "%u\n",
bmc->id.device_revision & 0x0F);
}
static DEVICE_ATTR(revision, S_IRUGO, revision_show, NULL);
static ssize_t firmware_revision_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 20, "%u.%x\n", bmc->id.firmware_revision_1,
bmc->id.firmware_revision_2);
}
static DEVICE_ATTR(firmware_revision, S_IRUGO, firmware_revision_show, NULL);
static ssize_t ipmi_version_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 20, "%u.%u\n",
ipmi_version_major(&bmc->id),
ipmi_version_minor(&bmc->id));
}
static DEVICE_ATTR(ipmi_version, S_IRUGO, ipmi_version_show, NULL);
static ssize_t add_dev_support_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 10, "0x%02x\n",
bmc->id.additional_device_support);
}
static DEVICE_ATTR(additional_device_support, S_IRUGO, add_dev_support_show,
NULL);
static ssize_t manufacturer_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 20, "0x%6.6x\n", bmc->id.manufacturer_id);
}
static DEVICE_ATTR(manufacturer_id, S_IRUGO, manufacturer_id_show, NULL);
static ssize_t product_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 10, "0x%4.4x\n", bmc->id.product_id);
}
static DEVICE_ATTR(product_id, S_IRUGO, product_id_show, NULL);
static ssize_t aux_firmware_rev_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 21, "0x%02x 0x%02x 0x%02x 0x%02x\n",
bmc->id.aux_firmware_revision[3],
bmc->id.aux_firmware_revision[2],
bmc->id.aux_firmware_revision[1],
bmc->id.aux_firmware_revision[0]);
}
static DEVICE_ATTR(aux_firmware_revision, S_IRUGO, aux_firmware_rev_show, NULL);
static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
return snprintf(buf, 100, "%Lx%Lx\n",
(long long) bmc->guid[0],
(long long) bmc->guid[8]);
}
static DEVICE_ATTR(guid, S_IRUGO, guid_show, NULL);
static struct attribute *bmc_dev_attrs[] = {
&dev_attr_device_id.attr,
&dev_attr_provides_device_sdrs.attr,
&dev_attr_revision.attr,
&dev_attr_firmware_revision.attr,
&dev_attr_ipmi_version.attr,
&dev_attr_additional_device_support.attr,
&dev_attr_manufacturer_id.attr,
&dev_attr_product_id.attr,
&dev_attr_aux_firmware_revision.attr,
&dev_attr_guid.attr,
NULL
};
static umode_t bmc_dev_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct bmc_device *bmc = to_bmc_device(dev);
umode_t mode = attr->mode;
if (attr == &dev_attr_aux_firmware_revision.attr)
return bmc->id.aux_firmware_revision_set ? mode : 0;
if (attr == &dev_attr_guid.attr)
return bmc->guid_set ? mode : 0;
return mode;
}
static const struct attribute_group bmc_dev_attr_group = {
.attrs = bmc_dev_attrs,
.is_visible = bmc_dev_attr_is_visible,
};
static const struct attribute_group *bmc_dev_attr_groups[] = {
&bmc_dev_attr_group,
NULL
};
static const struct device_type bmc_device_type = {
.groups = bmc_dev_attr_groups,
};
static void
release_bmc_device(struct device *dev)
{
kfree(to_bmc_device(dev));
}
static void
cleanup_bmc_device(struct kref *ref)
{
struct bmc_device *bmc = container_of(ref, struct bmc_device, usecount);
platform_device_unregister(&bmc->pdev);
}
static void ipmi_bmc_unregister(ipmi_smi_t intf)
{
struct bmc_device *bmc = intf->bmc;
sysfs_remove_link(&intf->si_dev->kobj, "bmc");
if (intf->my_dev_name) {
sysfs_remove_link(&bmc->pdev.dev.kobj, intf->my_dev_name);
kfree(intf->my_dev_name);
intf->my_dev_name = NULL;
}
mutex_lock(&ipmidriver_mutex);
kref_put(&bmc->usecount, cleanup_bmc_device);
intf->bmc = NULL;
mutex_unlock(&ipmidriver_mutex);
}
static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum)
{
int rv;
struct bmc_device *bmc = intf->bmc;
struct bmc_device *old_bmc;
mutex_lock(&ipmidriver_mutex);
/*
* Try to find if there is an bmc_device struct
* representing the interfaced BMC already
*/
if (bmc->guid_set)
old_bmc = ipmi_find_bmc_guid(&ipmidriver.driver, bmc->guid);
else
old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
bmc->id.product_id,
bmc->id.device_id);
/*
* If there is already an bmc_device, free the new one,
* otherwise register the new BMC device
*/
if (old_bmc) {
kfree(bmc);
intf->bmc = old_bmc;
bmc = old_bmc;
kref_get(&bmc->usecount);
mutex_unlock(&ipmidriver_mutex);
printk(KERN_INFO
"ipmi: interfacing existing BMC (man_id: 0x%6.6x,"
" prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
bmc->id.manufacturer_id,
bmc->id.product_id,
bmc->id.device_id);
} else {
unsigned char orig_dev_id = bmc->id.device_id;
int warn_printed = 0;
snprintf(bmc->name, sizeof(bmc->name),
"ipmi_bmc.%4.4x", bmc->id.product_id);
bmc->pdev.name = bmc->name;
while (ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
bmc->id.product_id,
bmc->id.device_id)) {
if (!warn_printed) {
printk(KERN_WARNING PFX
"This machine has two different BMCs"
" with the same product id and device"
" id. This is an error in the"
" firmware, but incrementing the"
" device id to work around the problem."
" Prod ID = 0x%x, Dev ID = 0x%x\n",
bmc->id.product_id, bmc->id.device_id);
warn_printed = 1;
}
bmc->id.device_id++; /* Wraps at 255 */
if (bmc->id.device_id == orig_dev_id) {
printk(KERN_ERR PFX
"Out of device ids!\n");
break;
}
}
bmc->pdev.dev.driver = &ipmidriver.driver;
bmc->pdev.id = bmc->id.device_id;
bmc->pdev.dev.release = release_bmc_device;
bmc->pdev.dev.type = &bmc_device_type;
kref_init(&bmc->usecount);
rv = platform_device_register(&bmc->pdev);
mutex_unlock(&ipmidriver_mutex);
if (rv) {
put_device(&bmc->pdev.dev);
printk(KERN_ERR
"ipmi_msghandler:"
" Unable to register bmc device: %d\n",
rv);
/*
* Don't go to out_err, you can only do that if
* the device is registered already.
*/
return rv;
}
dev_info(intf->si_dev, "Found new BMC (man_id: 0x%6.6x, "
"prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
bmc->id.manufacturer_id,
bmc->id.product_id,
bmc->id.device_id);
}
/*
* create symlink from system interface device to bmc device
* and back.
*/
rv = sysfs_create_link(&intf->si_dev->kobj, &bmc->pdev.dev.kobj, "bmc");
if (rv) {
printk(KERN_ERR
"ipmi_msghandler: Unable to create bmc symlink: %d\n",
rv);
goto out_err;
}
intf->my_dev_name = kasprintf(GFP_KERNEL, "ipmi%d", ifnum);
if (!intf->my_dev_name) {
rv = -ENOMEM;
printk(KERN_ERR
"ipmi_msghandler: allocate link from BMC: %d\n",
rv);
goto out_err;
}
rv = sysfs_create_link(&bmc->pdev.dev.kobj, &intf->si_dev->kobj,
intf->my_dev_name);
if (rv) {
kfree(intf->my_dev_name);
intf->my_dev_name = NULL;
printk(KERN_ERR
"ipmi_msghandler:"
" Unable to create symlink to bmc: %d\n",
rv);
goto out_err;
}
return 0;
out_err:
ipmi_bmc_unregister(intf);
return rv;
}
static int
send_guid_cmd(ipmi_smi_t intf, int chan)
{
struct kernel_ipmi_msg msg;
struct ipmi_system_interface_addr si;
si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
si.channel = IPMI_BMC_CHANNEL;
si.lun = 0;
msg.netfn = IPMI_NETFN_APP_REQUEST;
msg.cmd = IPMI_GET_DEVICE_GUID_CMD;
msg.data = NULL;
msg.data_len = 0;
return i_ipmi_request(NULL,
intf,
(struct ipmi_addr *) &si,
0,
&msg,
intf,
NULL,
NULL,
0,
intf->channels[0].address,
intf->channels[0].lun,
-1, 0);
}
static void
guid_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
|| (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE)
|| (msg->msg.cmd != IPMI_GET_DEVICE_GUID_CMD))
/* Not for me */
return;
if (msg->msg.data[0] != 0) {
/* Error from getting the GUID, the BMC doesn't have one. */
intf->bmc->guid_set = 0;
goto out;
}
if (msg->msg.data_len < 17) {
intf->bmc->guid_set = 0;
printk(KERN_WARNING PFX
"guid_handler: The GUID response from the BMC was too"
" short, it was %d but should have been 17. Assuming"
" GUID is not available.\n",
msg->msg.data_len);
goto out;
}
memcpy(intf->bmc->guid, msg->msg.data, 16);
intf->bmc->guid_set = 1;
out:
wake_up(&intf->waitq);
}
static void
get_guid(ipmi_smi_t intf)
{
int rv;
intf->bmc->guid_set = 0x2;
intf->null_user_handler = guid_handler;
rv = send_guid_cmd(intf, 0);
if (rv)
/* Send failed, no GUID available. */
intf->bmc->guid_set = 0;
wait_event(intf->waitq, intf->bmc->guid_set != 2);
intf->null_user_handler = NULL;
}
static int
send_channel_info_cmd(ipmi_smi_t intf, int chan)
{
struct kernel_ipmi_msg msg;
unsigned char data[1];
struct ipmi_system_interface_addr si;
si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
si.channel = IPMI_BMC_CHANNEL;
si.lun = 0;
msg.netfn = IPMI_NETFN_APP_REQUEST;
msg.cmd = IPMI_GET_CHANNEL_INFO_CMD;
msg.data = data;
msg.data_len = 1;
data[0] = chan;
return i_ipmi_request(NULL,
intf,
(struct ipmi_addr *) &si,
0,
&msg,
intf,
NULL,
NULL,
0,
intf->channels[0].address,
intf->channels[0].lun,
-1, 0);
}
static void
channel_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
int rv = 0;
int chan;
if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
&& (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
&& (msg->msg.cmd == IPMI_GET_CHANNEL_INFO_CMD)) {
/* It's the one we want */
if (msg->msg.data[0] != 0) {
/* Got an error from the channel, just go on. */
if (msg->msg.data[0] == IPMI_INVALID_COMMAND_ERR) {
/*
* If the MC does not support this
* command, that is legal. We just
* assume it has one IPMB at channel
* zero.
*/
intf->channels[0].medium
= IPMI_CHANNEL_MEDIUM_IPMB;
intf->channels[0].protocol
= IPMI_CHANNEL_PROTOCOL_IPMB;
intf->curr_channel = IPMI_MAX_CHANNELS;
wake_up(&intf->waitq);
goto out;
}
goto next_channel;
}
if (msg->msg.data_len < 4) {
/* Message not big enough, just go on. */
goto next_channel;
}
chan = intf->curr_channel;
intf->channels[chan].medium = msg->msg.data[2] & 0x7f;
intf->channels[chan].protocol = msg->msg.data[3] & 0x1f;
next_channel:
intf->curr_channel++;
if (intf->curr_channel >= IPMI_MAX_CHANNELS)
wake_up(&intf->waitq);
else
rv = send_channel_info_cmd(intf, intf->curr_channel);
if (rv) {
/* Got an error somehow, just give up. */
printk(KERN_WARNING PFX
"Error sending channel information for channel"
" %d: %d\n", intf->curr_channel, rv);
intf->curr_channel = IPMI_MAX_CHANNELS;
wake_up(&intf->waitq);
}
}
out:
return;
}
static void ipmi_poll(ipmi_smi_t intf)
{
if (intf->handlers->poll)
intf->handlers->poll(intf->send_info);
/* In case something came in */
handle_new_recv_msgs(intf);
}
void ipmi_poll_interface(ipmi_user_t user)
{
ipmi_poll(user->intf);
}
EXPORT_SYMBOL(ipmi_poll_interface);
int ipmi_register_smi(const struct ipmi_smi_handlers *handlers,
void *send_info,
struct ipmi_device_id *device_id,
struct device *si_dev,
unsigned char slave_addr)
{
int i, j;
int rv;
ipmi_smi_t intf;
ipmi_smi_t tintf;
struct list_head *link;
/*
* Make sure the driver is actually initialized, this handles
* problems with initialization order.
*/
if (!initialized) {
rv = ipmi_init_msghandler();
if (rv)
return rv;
/*
* The init code doesn't return an error if it was turned
* off, but it won't initialize. Check that.
*/
if (!initialized)
return -ENODEV;
}
intf = kzalloc(sizeof(*intf), GFP_KERNEL);
if (!intf)
return -ENOMEM;
intf->ipmi_version_major = ipmi_version_major(device_id);
intf->ipmi_version_minor = ipmi_version_minor(device_id);
intf->bmc = kzalloc(sizeof(*intf->bmc), GFP_KERNEL);
if (!intf->bmc) {
kfree(intf);
return -ENOMEM;
}
intf->intf_num = -1; /* Mark it invalid for now. */
kref_init(&intf->refcount);
intf->bmc->id = *device_id;
intf->si_dev = si_dev;
for (j = 0; j < IPMI_MAX_CHANNELS; j++) {
intf->channels[j].address = IPMI_BMC_SLAVE_ADDR;
intf->channels[j].lun = 2;
}
if (slave_addr != 0)
intf->channels[0].address = slave_addr;
INIT_LIST_HEAD(&intf->users);
intf->handlers = handlers;
intf->send_info = send_info;
spin_lock_init(&intf->seq_lock);
for (j = 0; j < IPMI_IPMB_NUM_SEQ; j++) {
intf->seq_table[j].inuse = 0;
intf->seq_table[j].seqid = 0;
}
intf->curr_seq = 0;
#ifdef CONFIG_PROC_FS
mutex_init(&intf->proc_entry_lock);
#endif
spin_lock_init(&intf->waiting_rcv_msgs_lock);
INIT_LIST_HEAD(&intf->waiting_rcv_msgs);
tasklet_init(&intf->recv_tasklet,
smi_recv_tasklet,
(unsigned long) intf);
atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0);
spin_lock_init(&intf->xmit_msgs_lock);
INIT_LIST_HEAD(&intf->xmit_msgs);
INIT_LIST_HEAD(&intf->hp_xmit_msgs);
spin_lock_init(&intf->events_lock);
atomic_set(&intf->event_waiters, 0);
intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
INIT_LIST_HEAD(&intf->waiting_events);
intf->waiting_events_count = 0;
mutex_init(&intf->cmd_rcvrs_mutex);
spin_lock_init(&intf->maintenance_mode_lock);
INIT_LIST_HEAD(&intf->cmd_rcvrs);
init_waitqueue_head(&intf->waitq);
for (i = 0; i < IPMI_NUM_STATS; i++)
atomic_set(&intf->stats[i], 0);
intf->proc_dir = NULL;
mutex_lock(&smi_watchers_mutex);
mutex_lock(&ipmi_interfaces_mutex);
/* Look for a hole in the numbers. */
i = 0;
link = &ipmi_interfaces;
list_for_each_entry_rcu(tintf, &ipmi_interfaces, link) {
if (tintf->intf_num != i) {
link = &tintf->link;
break;
}
i++;
}
/* Add the new interface in numeric order. */
if (i == 0)
list_add_rcu(&intf->link, &ipmi_interfaces);
else
list_add_tail_rcu(&intf->link, link);
rv = handlers->start_processing(send_info, intf);
if (rv)
goto out;
get_guid(intf);
if ((intf->ipmi_version_major > 1)
|| ((intf->ipmi_version_major == 1)
&& (intf->ipmi_version_minor >= 5))) {
/*
* Start scanning the channels to see what is
* available.
*/
intf->null_user_handler = channel_handler;
intf->curr_channel = 0;
rv = send_channel_info_cmd(intf, 0);
if (rv) {
printk(KERN_WARNING PFX
"Error sending channel information for channel"
" 0, %d\n", rv);
goto out;
}
/* Wait for the channel info to be read. */
wait_event(intf->waitq,
intf->curr_channel >= IPMI_MAX_CHANNELS);
intf->null_user_handler = NULL;
} else {
/* Assume a single IPMB channel at zero. */
intf->channels[0].medium = IPMI_CHANNEL_MEDIUM_IPMB;
intf->channels[0].protocol = IPMI_CHANNEL_PROTOCOL_IPMB;
intf->curr_channel = IPMI_MAX_CHANNELS;
}
rv = ipmi_bmc_register(intf, i);
if (rv == 0)
rv = add_proc_entries(intf, i);
out:
if (rv) {
if (intf->proc_dir)
remove_proc_entries(intf);
intf->handlers = NULL;
list_del_rcu(&intf->link);
mutex_unlock(&ipmi_interfaces_mutex);
mutex_unlock(&smi_watchers_mutex);
synchronize_rcu();
kref_put(&intf->refcount, intf_free);
} else {
/*
* Keep memory order straight for RCU readers. Make
* sure everything else is committed to memory before
* setting intf_num to mark the interface valid.
*/
smp_wmb();
intf->intf_num = i;
mutex_unlock(&ipmi_interfaces_mutex);
/* After this point the interface is legal to use. */
call_smi_watchers(i, intf->si_dev);
mutex_unlock(&smi_watchers_mutex);
}
return rv;
}
EXPORT_SYMBOL(ipmi_register_smi);
static void deliver_smi_err_response(ipmi_smi_t intf,
struct ipmi_smi_msg *msg,
unsigned char err)
{
msg->rsp[0] = msg->data[0] | 4;
msg->rsp[1] = msg->data[1];
msg->rsp[2] = err;
msg->rsp_size = 3;
/* It's an error, so it will never requeue, no need to check return. */
handle_one_recv_msg(intf, msg);
}
static void cleanup_smi_msgs(ipmi_smi_t intf)
{
int i;
struct seq_table *ent;
struct ipmi_smi_msg *msg;
struct list_head *entry;
struct list_head tmplist;
/* Clear out our transmit queues and hold the messages. */
INIT_LIST_HEAD(&tmplist);
list_splice_tail(&intf->hp_xmit_msgs, &tmplist);
list_splice_tail(&intf->xmit_msgs, &tmplist);
/* Current message first, to preserve order */
while (intf->curr_msg && !list_empty(&intf->waiting_rcv_msgs)) {
/* Wait for the message to clear out. */
schedule_timeout(1);
}
/* No need for locks, the interface is down. */
/*
* Return errors for all pending messages in queue and in the
* tables waiting for remote responses.
*/
while (!list_empty(&tmplist)) {
entry = tmplist.next;
list_del(entry);
msg = list_entry(entry, struct ipmi_smi_msg, link);
deliver_smi_err_response(intf, msg, IPMI_ERR_UNSPECIFIED);
}
for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
ent = &(intf->seq_table[i]);
if (!ent->inuse)
continue;
deliver_err_response(ent->recv_msg, IPMI_ERR_UNSPECIFIED);
}
}
int ipmi_unregister_smi(ipmi_smi_t intf)
{
struct ipmi_smi_watcher *w;
int intf_num = intf->intf_num;
ipmi_user_t user;
mutex_lock(&smi_watchers_mutex);
mutex_lock(&ipmi_interfaces_mutex);
intf->intf_num = -1;
intf->in_shutdown = true;
list_del_rcu(&intf->link);
mutex_unlock(&ipmi_interfaces_mutex);
synchronize_rcu();
cleanup_smi_msgs(intf);
/* Clean up the effects of users on the lower-level software. */
mutex_lock(&ipmi_interfaces_mutex);
rcu_read_lock();
list_for_each_entry_rcu(user, &intf->users, link) {
module_put(intf->handlers->owner);
if (intf->handlers->dec_usecount)
intf->handlers->dec_usecount(intf->send_info);
}
rcu_read_unlock();
intf->handlers = NULL;
mutex_unlock(&ipmi_interfaces_mutex);
remove_proc_entries(intf);
ipmi_bmc_unregister(intf);
/*
* Call all the watcher interfaces to tell them that
* an interface is gone.
*/
list_for_each_entry(w, &smi_watchers, link)
w->smi_gone(intf_num);
mutex_unlock(&smi_watchers_mutex);
kref_put(&intf->refcount, intf_free);
return 0;
}
EXPORT_SYMBOL(ipmi_unregister_smi);
static int handle_ipmb_get_msg_rsp(ipmi_smi_t intf,
struct ipmi_smi_msg *msg)
{
struct ipmi_ipmb_addr ipmb_addr;
struct ipmi_recv_msg *recv_msg;
/*
* This is 11, not 10, because the response must contain a
* completion code.
*/
if (msg->rsp_size < 11) {
/* Message not big enough, just ignore it. */
ipmi_inc_stat(intf, invalid_ipmb_responses);
return 0;
}
if (msg->rsp[2] != 0) {
/* An error getting the response, just ignore it. */
return 0;
}
ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE;
ipmb_addr.slave_addr = msg->rsp[6];
ipmb_addr.channel = msg->rsp[3] & 0x0f;
ipmb_addr.lun = msg->rsp[7] & 3;
/*
* It's a response from a remote entity. Look up the sequence
* number and handle the response.
*/
if (intf_find_seq(intf,
msg->rsp[7] >> 2,
msg->rsp[3] & 0x0f,
msg->rsp[8],
(msg->rsp[4] >> 2) & (~1),
(struct ipmi_addr *) &(ipmb_addr),
&recv_msg)) {
/*
* We were unable to find the sequence number,
* so just nuke the message.
*/
ipmi_inc_stat(intf, unhandled_ipmb_responses);
return 0;
}
memcpy(recv_msg->msg_data,
&(msg->rsp[9]),
msg->rsp_size - 9);
/*
* The other fields matched, so no need to set them, except
* for netfn, which needs to be the response that was
* returned, not the request value.
*/
recv_msg->msg.netfn = msg->rsp[4] >> 2;
recv_msg->msg.data = recv_msg->msg_data;
recv_msg->msg.data_len = msg->rsp_size - 10;
recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
ipmi_inc_stat(intf, handled_ipmb_responses);
deliver_response(recv_msg);
return 0;
}
static int handle_ipmb_get_msg_cmd(ipmi_smi_t intf,
struct ipmi_smi_msg *msg)
{
struct cmd_rcvr *rcvr;
int rv = 0;
unsigned char netfn;
unsigned char cmd;
unsigned char chan;
ipmi_user_t user = NULL;
struct ipmi_ipmb_addr *ipmb_addr;
struct ipmi_recv_msg *recv_msg;
if (msg->rsp_size < 10) {
/* Message not big enough, just ignore it. */
ipmi_inc_stat(intf, invalid_commands);
return 0;
}
if (msg->rsp[2] != 0) {
/* An error getting the response, just ignore it. */
return 0;
}
netfn = msg->rsp[4] >> 2;
cmd = msg->rsp[8];
chan = msg->rsp[3] & 0xf;
rcu_read_lock();
rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
if (rcvr) {
user = rcvr->user;
kref_get(&user->refcount);
} else
user = NULL;
rcu_read_unlock();
if (user == NULL) {
/* We didn't find a user, deliver an error response. */
ipmi_inc_stat(intf, unhandled_commands);
msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
msg->data[1] = IPMI_SEND_MSG_CMD;
msg->data[2] = msg->rsp[3];
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->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 */
msg->data[9] = IPMI_INVALID_CMD_COMPLETION_CODE;
msg->data[10] = ipmb_checksum(&(msg->data[6]), 4);
msg->data_size = 11;
#ifdef DEBUG_MSGING
{
int m;
printk("Invalid command:");
for (m = 0; m < msg->data_size; m++)
printk(" %2.2x", msg->data[m]);
printk("\n");
}
#endif
rcu_read_lock();
if (!intf->in_shutdown) {
smi_send(intf, intf->