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linux/drivers/char/ipmi/ipmi_msghandler.c
Terry Duncan c6ddd5f1c3 ipmi: Refine retry conditions for getting device id 
Rarely but still failures are observed while getting BMC device ID
so this commit changes the condition to retry to get device id
when cc is not IPMI_CC_NO_ERROR.

Signed-off-by: Terry Duncan <terry.s.duncan@intel.com>
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Message-Id: <20210225045027.9344-1-jae.hyun.yoo@linux.intel.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
2021-03-10 19:00:02 -06:00

5229 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* 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.
*/
#define pr_fmt(fmt) "%s" fmt, "IPMI message handler: "
#define dev_fmt pr_fmt
#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>
#include <linux/moduleparam.h>
#include <linux/workqueue.h>
#include <linux/uuid.h>
#include <linux/nospec.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#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(struct tasklet_struct *t);
static void handle_new_recv_msgs(struct ipmi_smi *intf);
static void need_waiter(struct ipmi_smi *intf);
static int handle_one_recv_msg(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg);
static bool initialized;
static bool drvregistered;
enum ipmi_panic_event_op {
IPMI_SEND_PANIC_EVENT_NONE,
IPMI_SEND_PANIC_EVENT,
IPMI_SEND_PANIC_EVENT_STRING
};
#ifdef CONFIG_IPMI_PANIC_STRING
#define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT_STRING
#elif defined(CONFIG_IPMI_PANIC_EVENT)
#define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT
#else
#define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT_NONE
#endif
static enum ipmi_panic_event_op ipmi_send_panic_event = IPMI_PANIC_DEFAULT;
static int panic_op_write_handler(const char *val,
const struct kernel_param *kp)
{
char valcp[16];
char *s;
strncpy(valcp, val, 15);
valcp[15] = '\0';
s = strstrip(valcp);
if (strcmp(s, "none") == 0)
ipmi_send_panic_event = IPMI_SEND_PANIC_EVENT_NONE;
else if (strcmp(s, "event") == 0)
ipmi_send_panic_event = IPMI_SEND_PANIC_EVENT;
else if (strcmp(s, "string") == 0)
ipmi_send_panic_event = IPMI_SEND_PANIC_EVENT_STRING;
else
return -EINVAL;
return 0;
}
static int panic_op_read_handler(char *buffer, const struct kernel_param *kp)
{
switch (ipmi_send_panic_event) {
case IPMI_SEND_PANIC_EVENT_NONE:
strcpy(buffer, "none\n");
break;
case IPMI_SEND_PANIC_EVENT:
strcpy(buffer, "event\n");
break;
case IPMI_SEND_PANIC_EVENT_STRING:
strcpy(buffer, "string\n");
break;
default:
strcpy(buffer, "???\n");
break;
}
return strlen(buffer);
}
static const struct kernel_param_ops panic_op_ops = {
.set = panic_op_write_handler,
.get = panic_op_read_handler
};
module_param_cb(panic_op, &panic_op_ops, NULL, 0600);
MODULE_PARM_DESC(panic_op, "Sets if the IPMI driver will attempt to store panic information in the event log in the event of a panic. Set to 'none' for no, 'event' for a single event, or 'string' for a generic event and the panic string in IPMI OEM events.");
#define MAX_EVENTS_IN_QUEUE 25
/* Remain in auto-maintenance mode for this amount of time (in ms). */
static unsigned long maintenance_mode_timeout_ms = 30000;
module_param(maintenance_mode_timeout_ms, ulong, 0644);
MODULE_PARM_DESC(maintenance_mode_timeout_ms,
"The time (milliseconds) after the last maintenance message that the connection stays in maintenance mode.");
/*
* 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
/*
* Timeout times below are in milliseconds, and are done off a 1
* second timer. So setting the value to 1000 would mean anything
* between 0 and 1000ms. So really the only reasonable minimum
* setting it 2000ms, which is between 1 and 2 seconds.
*/
/* The default timeout for message retries. */
static unsigned long default_retry_ms = 2000;
module_param(default_retry_ms, ulong, 0644);
MODULE_PARM_DESC(default_retry_ms,
"The time (milliseconds) between retry sends");
/* The default timeout for maintenance mode message retries. */
static unsigned long default_maintenance_retry_ms = 3000;
module_param(default_maintenance_retry_ms, ulong, 0644);
MODULE_PARM_DESC(default_maintenance_retry_ms,
"The time (milliseconds) between retry sends in maintenance mode");
/* The default maximum number of retries */
static unsigned int default_max_retries = 4;
module_param(default_max_retries, uint, 0644);
MODULE_PARM_DESC(default_max_retries,
"The time (milliseconds) between retry sends in maintenance mode");
/* 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))
/* How long should we cache dynamic device IDs? */
#define IPMI_DYN_DEV_ID_EXPIRY (10 * HZ)
/*
* The main "user" data structure.
*/
struct ipmi_user {
struct list_head link;
/*
* Set to NULL when the user is destroyed, a pointer to myself
* so srcu_dereference can be used on it.
*/
struct ipmi_user *self;
struct srcu_struct release_barrier;
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. */
struct ipmi_smi *intf;
/* Does this interface receive IPMI events? */
bool gets_events;
/* Free must run in process context for RCU cleanup. */
struct work_struct remove_work;
};
static struct ipmi_user *acquire_ipmi_user(struct ipmi_user *user, int *index)
__acquires(user->release_barrier)
{
struct ipmi_user *ruser;
*index = srcu_read_lock(&user->release_barrier);
ruser = srcu_dereference(user->self, &user->release_barrier);
if (!ruser)
srcu_read_unlock(&user->release_barrier, *index);
return ruser;
}
static void release_ipmi_user(struct ipmi_user *user, int index)
{
srcu_read_unlock(&user->release_barrier, index);
}
struct cmd_rcvr {
struct list_head link;
struct ipmi_user *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)
#define IPMI_MAX_CHANNELS 16
struct ipmi_channel {
unsigned char medium;
unsigned char protocol;
};
struct ipmi_channel_set {
struct ipmi_channel c[IPMI_MAX_CHANNELS];
};
struct ipmi_my_addrinfo {
/*
* 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;
};
/*
* Note that the product id, manufacturer id, guid, and device id are
* immutable in this structure, so dyn_mutex is not required for
* accessing those. If those change on a BMC, a new BMC is allocated.
*/
struct bmc_device {
struct platform_device pdev;
struct list_head intfs; /* Interfaces on this BMC. */
struct ipmi_device_id id;
struct ipmi_device_id fetch_id;
int dyn_id_set;
unsigned long dyn_id_expiry;
struct mutex dyn_mutex; /* Protects id, intfs, & dyn* */
guid_t guid;
guid_t fetch_guid;
int dyn_guid_set;
struct kref usecount;
struct work_struct remove_work;
unsigned char cc; /* completion code */
};
#define to_bmc_device(x) container_of((x), struct bmc_device, pdev.dev)
static int bmc_get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc,
struct ipmi_device_id *id,
bool *guid_set, guid_t *guid);
/*
* 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
struct ipmi_smi {
struct module *owner;
/* 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 write
* protects this. Read protection is with srcu.
*/
struct list_head users;
struct srcu_struct users_srcu;
/* Used for wake ups at startup. */
wait_queue_head_t waitq;
/*
* Prevents the interface from being unregistered when the
* interface is used by being looked up through the BMC
* structure.
*/
struct mutex bmc_reg_mutex;
struct bmc_device tmp_bmc;
struct bmc_device *bmc;
bool bmc_registered;
struct list_head bmc_link;
char *my_dev_name;
bool in_bmc_register; /* Handle recursive situations. Yuck. */
struct work_struct bmc_reg_work;
const struct ipmi_smi_handlers *handlers;
void *send_info;
/* 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;
/* How many users are waiting for events? */
atomic_t event_waiters;
unsigned int ticks_to_req_ev;
spinlock_t watch_lock; /* For dealing with watch stuff below. */
/* How many users are waiting for commands? */
unsigned int command_waiters;
/* How many users are waiting for watchdogs? */
unsigned int watchdog_waiters;
/* How many users are waiting for message responses? */
unsigned int response_waiters;
/*
* Tells what the lower layer has last been asked to watch for,
* messages and/or watchdogs. Protected by watch_lock.
*/
unsigned int last_watch_mask;
/*
* 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... */
/*
* If we are doing maintenance on something on IPMB, extend
* the timeout time to avoid timeouts writing firmware and
* such.
*/
int ipmb_maintenance_mode_timeout;
/*
* 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.
*
* Protected by bmc_reg_mutex.
*/
void (*null_user_handler)(struct ipmi_smi *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_set *channel_list;
unsigned int curr_working_cset; /* First index into the following. */
struct ipmi_channel_set wchannels[2];
struct ipmi_my_addrinfo addrinfo[IPMI_MAX_CHANNELS];
bool channels_ready;
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)
static void __get_guid(struct ipmi_smi *intf);
static void __ipmi_bmc_unregister(struct ipmi_smi *intf);
static int __ipmi_bmc_register(struct ipmi_smi *intf,
struct ipmi_device_id *id,
bool guid_set, guid_t *guid, int intf_num);
static int __scan_channels(struct ipmi_smi *intf, struct ipmi_device_id *id);
/**
* The driver model view of the IPMI messaging driver.
*/
static struct platform_driver ipmidriver = {
.driver = {
.name = "ipmi",
.bus = &platform_bus_type
}
};
/*
* This mutex keeps us from adding the same BMC twice.
*/
static DEFINE_MUTEX(ipmidriver_mutex);
static LIST_HEAD(ipmi_interfaces);
static DEFINE_MUTEX(ipmi_interfaces_mutex);
#define ipmi_interfaces_mutex_held() \
lockdep_is_held(&ipmi_interfaces_mutex)
static struct srcu_struct ipmi_interfaces_srcu;
/*
* 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", "platform"
};
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(struct ipmi_smi *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)
{
struct ipmi_smi *intf = container_of(ref, struct ipmi_smi, refcount);
clean_up_interface_data(intf);
kfree(intf);
}
struct watcher_entry {
int intf_num;
struct ipmi_smi *intf;
struct list_head link;
};
int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher)
{
struct ipmi_smi *intf;
int index, rv;
/*
* Make sure the driver is actually initialized, this handles
* problems with initialization order.
*/
rv = ipmi_init_msghandler();
if (rv)
return rv;
mutex_lock(&smi_watchers_mutex);
list_add(&watcher->link, &smi_watchers);
index = srcu_read_lock(&ipmi_interfaces_srcu);
list_for_each_entry_rcu(intf, &ipmi_interfaces, link,
lockdep_is_held(&smi_watchers_mutex)) {
int intf_num = READ_ONCE(intf->intf_num);
if (intf_num == -1)
continue;
watcher->new_smi(intf_num, intf->si_dev);
}
srcu_read_unlock(&ipmi_interfaces_srcu, index);
mutex_unlock(&smi_watchers_mutex);
return 0;
}
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;
mutex_lock(&smi_watchers_mutex);
list_for_each_entry(w, &smi_watchers, link) {
if (try_module_get(w->owner)) {
w->new_smi(i, dev);
module_put(w->owner);
}
}
mutex_unlock(&smi_watchers_mutex);
}
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 int deliver_response(struct ipmi_smi *intf, struct ipmi_recv_msg *msg)
{
int rv = 0;
if (!msg->user) {
/* Special handling for NULL users. */
if (intf->null_user_handler) {
intf->null_user_handler(intf, msg);
} else {
/* No handler, so give up. */
rv = -EINVAL;
}
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_free_recv_msg(msg);
} else {
int index;
struct ipmi_user *user = acquire_ipmi_user(msg->user, &index);
if (user) {
user->handler->ipmi_recv_hndl(msg, user->handler_data);
release_ipmi_user(user, index);
} else {
/* User went away, give up. */
ipmi_free_recv_msg(msg);
rv = -EINVAL;
}
}
return rv;
}
static void deliver_local_response(struct ipmi_smi *intf,
struct ipmi_recv_msg *msg)
{
if (deliver_response(intf, msg))
ipmi_inc_stat(intf, unhandled_local_responses);
else
ipmi_inc_stat(intf, handled_local_responses);
}
static void deliver_err_response(struct ipmi_smi *intf,
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_local_response(intf, msg);
}
static void smi_add_watch(struct ipmi_smi *intf, unsigned int flags)
{
unsigned long iflags;
if (!intf->handlers->set_need_watch)
return;
spin_lock_irqsave(&intf->watch_lock, iflags);
if (flags & IPMI_WATCH_MASK_CHECK_MESSAGES)
intf->response_waiters++;
if (flags & IPMI_WATCH_MASK_CHECK_WATCHDOG)
intf->watchdog_waiters++;
if (flags & IPMI_WATCH_MASK_CHECK_COMMANDS)
intf->command_waiters++;
if ((intf->last_watch_mask & flags) != flags) {
intf->last_watch_mask |= flags;
intf->handlers->set_need_watch(intf->send_info,
intf->last_watch_mask);
}
spin_unlock_irqrestore(&intf->watch_lock, iflags);
}
static void smi_remove_watch(struct ipmi_smi *intf, unsigned int flags)
{
unsigned long iflags;
if (!intf->handlers->set_need_watch)
return;
spin_lock_irqsave(&intf->watch_lock, iflags);
if (flags & IPMI_WATCH_MASK_CHECK_MESSAGES)
intf->response_waiters--;
if (flags & IPMI_WATCH_MASK_CHECK_WATCHDOG)
intf->watchdog_waiters--;
if (flags & IPMI_WATCH_MASK_CHECK_COMMANDS)
intf->command_waiters--;
flags = 0;
if (intf->response_waiters)
flags |= IPMI_WATCH_MASK_CHECK_MESSAGES;
if (intf->watchdog_waiters)
flags |= IPMI_WATCH_MASK_CHECK_WATCHDOG;
if (intf->command_waiters)
flags |= IPMI_WATCH_MASK_CHECK_COMMANDS;
if (intf->last_watch_mask != flags) {
intf->last_watch_mask = flags;
intf->handlers->set_need_watch(intf->send_info,
intf->last_watch_mask);
}
spin_unlock_irqrestore(&intf->watch_lock, iflags);
}
/*
* 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(struct ipmi_smi *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;
if (timeout == 0)
timeout = default_retry_ms;
if (retries < 0)
retries = default_max_retries;
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;
smi_add_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES);
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(struct ipmi_smi *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;
smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES);
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(struct ipmi_smi *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(struct ipmi_smi *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;
smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES);
msg = ent->recv_msg;
rv = 0;
}
spin_unlock_irqrestore(&intf->seq_lock, flags);
if (msg)
deliver_err_response(intf, msg, err);
return rv;
}
static void free_user_work(struct work_struct *work)
{
struct ipmi_user *user = container_of(work, struct ipmi_user,
remove_work);
cleanup_srcu_struct(&user->release_barrier);
vfree(user);
}
int ipmi_create_user(unsigned int if_num,
const struct ipmi_user_hndl *handler,
void *handler_data,
struct ipmi_user **user)
{
unsigned long flags;
struct ipmi_user *new_user;
int rv, index;
struct ipmi_smi *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.
*/
rv = ipmi_init_msghandler();
if (rv)
return rv;
new_user = vzalloc(sizeof(*new_user));
if (!new_user)
return -ENOMEM;
index = srcu_read_lock(&ipmi_interfaces_srcu);
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:
INIT_WORK(&new_user->remove_work, free_user_work);
rv = init_srcu_struct(&new_user->release_barrier);
if (rv)
goto out_kfree;
if (!try_module_get(intf->owner)) {
rv = -ENODEV;
goto out_kfree;
}
/* 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;
rcu_assign_pointer(new_user->self, new_user);
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. */
smi_add_watch(intf, IPMI_WATCH_MASK_CHECK_WATCHDOG);
srcu_read_unlock(&ipmi_interfaces_srcu, index);
*user = new_user;
return 0;
out_kfree:
srcu_read_unlock(&ipmi_interfaces_srcu, index);
vfree(new_user);
return rv;
}
EXPORT_SYMBOL(ipmi_create_user);
int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data)
{
int rv, index;
struct ipmi_smi *intf;
index = srcu_read_lock(&ipmi_interfaces_srcu);
list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
if (intf->intf_num == if_num)
goto found;
}
srcu_read_unlock(&ipmi_interfaces_srcu, index);
/* Not found, return an error */
return -EINVAL;
found:
if (!intf->handlers->get_smi_info)
rv = -ENOTTY;
else
rv = intf->handlers->get_smi_info(intf->send_info, data);
srcu_read_unlock(&ipmi_interfaces_srcu, index);
return rv;
}
EXPORT_SYMBOL(ipmi_get_smi_info);
static void free_user(struct kref *ref)
{
struct ipmi_user *user = container_of(ref, struct ipmi_user, refcount);
/* SRCU cleanup must happen in task context. */
schedule_work(&user->remove_work);
}
static void _ipmi_destroy_user(struct ipmi_user *user)
{
struct ipmi_smi *intf = user->intf;
int i;
unsigned long flags;
struct cmd_rcvr *rcvr;
struct cmd_rcvr *rcvrs = NULL;
if (!acquire_ipmi_user(user, &i)) {
/*
* The user has already been cleaned up, just make sure
* nothing is using it and return.
*/
synchronize_srcu(&user->release_barrier);
return;
}
rcu_assign_pointer(user->self, NULL);
release_ipmi_user(user, i);
synchronize_srcu(&user->release_barrier);
if (user->handler->shutdown)
user->handler->shutdown(user->handler_data);
if (user->handler->ipmi_watchdog_pretimeout)
smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_WATCHDOG);
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;
smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES);
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_srcu()) then free everything in that list.
*/
mutex_lock(&intf->cmd_rcvrs_mutex);
list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link,
lockdep_is_held(&intf->cmd_rcvrs_mutex)) {
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);
}
kref_put(&intf->refcount, intf_free);
module_put(intf->owner);
}
int ipmi_destroy_user(struct ipmi_user *user)
{
_ipmi_destroy_user(user);
kref_put(&user->refcount, free_user);
return 0;
}
EXPORT_SYMBOL(ipmi_destroy_user);
int ipmi_get_version(struct ipmi_user *user,
unsigned char *major,
unsigned char *minor)
{
struct ipmi_device_id id;
int rv, index;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
rv = bmc_get_device_id(user->intf, NULL, &id, NULL, NULL);
if (!rv) {
*major = ipmi_version_major(&id);
*minor = ipmi_version_minor(&id);
}
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_get_version);
int ipmi_set_my_address(struct ipmi_user *user,
unsigned int channel,
unsigned char address)
{
int index, rv = 0;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
if (channel >= IPMI_MAX_CHANNELS) {
rv = -EINVAL;
} else {
channel = array_index_nospec(channel, IPMI_MAX_CHANNELS);
user->intf->addrinfo[channel].address = address;
}
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_set_my_address);
int ipmi_get_my_address(struct ipmi_user *user,
unsigned int channel,
unsigned char *address)
{
int index, rv = 0;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
if (channel >= IPMI_MAX_CHANNELS) {
rv = -EINVAL;
} else {
channel = array_index_nospec(channel, IPMI_MAX_CHANNELS);
*address = user->intf->addrinfo[channel].address;
}
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_get_my_address);
int ipmi_set_my_LUN(struct ipmi_user *user,
unsigned int channel,
unsigned char LUN)
{
int index, rv = 0;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
if (channel >= IPMI_MAX_CHANNELS) {
rv = -EINVAL;
} else {
channel = array_index_nospec(channel, IPMI_MAX_CHANNELS);
user->intf->addrinfo[channel].lun = LUN & 0x3;
}
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_set_my_LUN);
int ipmi_get_my_LUN(struct ipmi_user *user,
unsigned int channel,
unsigned char *address)
{
int index, rv = 0;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
if (channel >= IPMI_MAX_CHANNELS) {
rv = -EINVAL;
} else {
channel = array_index_nospec(channel, IPMI_MAX_CHANNELS);
*address = user->intf->addrinfo[channel].lun;
}
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_get_my_LUN);
int ipmi_get_maintenance_mode(struct ipmi_user *user)
{
int mode, index;
unsigned long flags;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags);
mode = user->intf->maintenance_mode;
spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags);
release_ipmi_user(user, index);
return mode;
}
EXPORT_SYMBOL(ipmi_get_maintenance_mode);
static void maintenance_mode_update(struct ipmi_smi *intf)
{
if (intf->handlers->set_maintenance_mode)
intf->handlers->set_maintenance_mode(
intf->send_info, intf->maintenance_mode_enable);
}
int ipmi_set_maintenance_mode(struct ipmi_user *user, int mode)
{
int rv = 0, index;
unsigned long flags;
struct ipmi_smi *intf = user->intf;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
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);
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_set_maintenance_mode);
int ipmi_set_gets_events(struct ipmi_user *user, bool val)
{
unsigned long flags;
struct ipmi_smi *intf = user->intf;
struct ipmi_recv_msg *msg, *msg2;
struct list_head msgs;
int index;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
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) {
dev_warn(intf->si_dev, "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_local_response(intf, msg);
}
spin_lock_irqsave(&intf->events_lock, flags);
intf->delivering_events = 0;
}
out:
spin_unlock_irqrestore(&intf->events_lock, flags);
release_ipmi_user(user, index);
return 0;
}
EXPORT_SYMBOL(ipmi_set_gets_events);
static struct cmd_rcvr *find_cmd_rcvr(struct ipmi_smi *intf,
unsigned char netfn,
unsigned char cmd,
unsigned char chan)
{
struct cmd_rcvr *rcvr;
list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link,
lockdep_is_held(&intf->cmd_rcvrs_mutex)) {
if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
&& (rcvr->chans & (1 << chan)))
return rcvr;
}
return NULL;
}
static int is_cmd_rcvr_exclusive(struct ipmi_smi *intf,
unsigned char netfn,
unsigned char cmd,
unsigned int chans)
{
struct cmd_rcvr *rcvr;
list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link,
lockdep_is_held(&intf->cmd_rcvrs_mutex)) {
if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
&& (rcvr->chans & chans))
return 0;
}
return 1;
}
int ipmi_register_for_cmd(struct ipmi_user *user,
unsigned char netfn,
unsigned char cmd,
unsigned int chans)
{
struct ipmi_smi *intf = user->intf;
struct cmd_rcvr *rcvr;
int rv = 0, index;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL);
if (!rcvr) {
rv = -ENOMEM;
goto out_release;
}
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;
}
smi_add_watch(intf, IPMI_WATCH_MASK_CHECK_COMMANDS);
list_add_rcu(&rcvr->link, &intf->cmd_rcvrs);
out_unlock:
mutex_unlock(&intf->cmd_rcvrs_mutex);
if (rv)
kfree(rcvr);
out_release:
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_register_for_cmd);
int ipmi_unregister_for_cmd(struct ipmi_user *user,
unsigned char netfn,
unsigned char cmd,
unsigned int chans)
{
struct ipmi_smi *intf = user->intf;
struct cmd_rcvr *rcvr;
struct cmd_rcvr *rcvrs = NULL;
int i, rv = -ENOENT, index;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
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();
release_ipmi_user(user, index);
while (rcvrs) {
smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_COMMANDS);
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(struct ipmi_smi *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(struct ipmi_smi *intf,
const struct ipmi_smi_handlers *handlers,
struct ipmi_smi_msg *smi_msg, int priority)
{
int run_to_completion = intf->run_to_completion;
unsigned long flags = 0;
if (!run_to_completion)
spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
smi_msg = smi_add_send_msg(intf, smi_msg, priority);
if (!run_to_completion)
spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
if (smi_msg)
handlers->sender(intf->send_info, smi_msg);
}
static bool is_maintenance_mode_cmd(struct kernel_ipmi_msg *msg)
{
return (((msg->netfn == IPMI_NETFN_APP_REQUEST)
&& ((msg->cmd == IPMI_COLD_RESET_CMD)
|| (msg->cmd == IPMI_WARM_RESET_CMD)))
|| (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST));
}
static int i_ipmi_req_sysintf(struct ipmi_smi *intf,
struct ipmi_addr *addr,
long msgid,
struct kernel_ipmi_msg *msg,
struct ipmi_smi_msg *smi_msg,
struct ipmi_recv_msg *recv_msg,
int retries,
unsigned int retry_time_ms)
{
struct ipmi_system_interface_addr *smi_addr;
if (msg->netfn & 1)
/* Responses are not allowed to the SMI. */
return -EINVAL;
smi_addr = (struct ipmi_system_interface_addr *) addr;
if (smi_addr->lun > 3) {
ipmi_inc_stat(intf, sent_invalid_commands);
return -EINVAL;
}
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);
return -EINVAL;
}
if (is_maintenance_mode_cmd(msg)) {
unsigned long flags;
spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
intf->auto_maintenance_timeout
= maintenance_mode_timeout_ms;
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);
return -EMSGSIZE;
}
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);
return 0;
}
static int i_ipmi_req_ipmb(struct ipmi_smi *intf,
struct ipmi_addr *addr,
long msgid,
struct kernel_ipmi_msg *msg,
struct ipmi_smi_msg *smi_msg,
struct ipmi_recv_msg *recv_msg,
unsigned char source_address,
unsigned char source_lun,
int retries,
unsigned int retry_time_ms)
{
struct ipmi_ipmb_addr *ipmb_addr;
unsigned char ipmb_seq;
long seqid;
int broadcast = 0;
struct ipmi_channel *chans;
int rv = 0;
if (addr->channel >= IPMI_MAX_CHANNELS) {
ipmi_inc_stat(intf, sent_invalid_commands);
return -EINVAL;
}
chans = READ_ONCE(intf->channel_list)->c;
if (chans[addr->channel].medium != IPMI_CHANNEL_MEDIUM_IPMB) {
ipmi_inc_stat(intf, sent_invalid_commands);
return -EINVAL;
}
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;
retries = 0; /* Don't retry broadcasts. */
}
/*
* 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);
return -EMSGSIZE;
}
ipmb_addr = (struct ipmi_ipmb_addr *) addr;
if (ipmb_addr->lun > 3) {
ipmi_inc_stat(intf, sent_invalid_commands);
return -EINVAL;
}
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. */
unsigned long flags;
spin_lock_irqsave(&intf->seq_lock, flags);
if (is_maintenance_mode_cmd(msg))
intf->ipmb_maintenance_mode_timeout =
maintenance_mode_timeout_ms;
if (intf->ipmb_maintenance_mode_timeout && retry_time_ms == 0)
/* Different default in maintenance mode */
retry_time_ms = default_maintenance_retry_ms;
/*
* 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.
*/
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.
*/
out_err:
spin_unlock_irqrestore(&intf->seq_lock, flags);
}
return rv;
}
static int i_ipmi_req_lan(struct ipmi_smi *intf,
struct ipmi_addr *addr,
long msgid,
struct kernel_ipmi_msg *msg,
struct ipmi_smi_msg *smi_msg,
struct ipmi_recv_msg *recv_msg,
unsigned char source_lun,
int retries,
unsigned int retry_time_ms)
{
struct ipmi_lan_addr *lan_addr;
unsigned char ipmb_seq;
long seqid;
struct ipmi_channel *chans;
int rv = 0;
if (addr->channel >= IPMI_MAX_CHANNELS) {
ipmi_inc_stat(intf, sent_invalid_commands);
return -EINVAL;
}
chans = READ_ONCE(intf->channel_list)->c;
if ((chans[addr->channel].medium
!= IPMI_CHANNEL_MEDIUM_8023LAN)
&& (chans[addr->channel].medium
!= IPMI_CHANNEL_MEDIUM_ASYNC)) {
ipmi_inc_stat(intf, sent_invalid_commands);
return -EINVAL;
}
/* 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);
return -EMSGSIZE;
}
lan_addr = (struct ipmi_lan_addr *) addr;
if (lan_addr->lun > 3) {
ipmi_inc_stat(intf, sent_invalid_commands);
return -EINVAL;
}
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. */
unsigned long flags;
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.
*/
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.
*/
out_err:
spin_unlock_irqrestore(&intf->seq_lock, flags);
}
return rv;
}
/*
* 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(struct ipmi_user *user,
struct ipmi_smi *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)
{
struct ipmi_smi_msg *smi_msg;
struct ipmi_recv_msg *recv_msg;
int rv = 0;
if (supplied_recv)
recv_msg = supplied_recv;
else {
recv_msg = ipmi_alloc_recv_msg();
if (recv_msg == NULL) {
rv = -ENOMEM;
goto out;
}
}
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) {
if (!supplied_recv)
ipmi_free_recv_msg(recv_msg);
rv = -ENOMEM;
goto out;
}
}
rcu_read_lock();
if (intf->in_shutdown) {
rv = -ENODEV;
goto out_err;
}
recv_msg->user = user;
if (user)
/* The put happens when the message is freed. */
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) {
rv = i_ipmi_req_sysintf(intf, addr, msgid, msg, smi_msg,
recv_msg, retries, retry_time_ms);
} else if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
rv = i_ipmi_req_ipmb(intf, addr, msgid, msg, smi_msg, recv_msg,
source_address, source_lun,
retries, retry_time_ms);
} else if (is_lan_addr(addr)) {
rv = i_ipmi_req_lan(intf, addr, msgid, msg, smi_msg, recv_msg,
source_lun, retries, retry_time_ms);
} else {
/* Unknown address type. */
ipmi_inc_stat(intf, sent_invalid_commands);
rv = -EINVAL;
}
if (rv) {
out_err:
ipmi_free_smi_msg(smi_msg);
ipmi_free_recv_msg(recv_msg);
} else {
pr_debug("Send: %*ph\n", smi_msg->data_size, smi_msg->data);
smi_send(intf, intf->handlers, smi_msg, priority);
}
rcu_read_unlock();
out:
return rv;
}
static int check_addr(struct ipmi_smi *intf,
struct ipmi_addr *addr,
unsigned char *saddr,
unsigned char *lun)
{
if (addr->channel >= IPMI_MAX_CHANNELS)
return -EINVAL;
addr->channel = array_index_nospec(addr->channel, IPMI_MAX_CHANNELS);
*lun = intf->addrinfo[addr->channel].lun;
*saddr = intf->addrinfo[addr->channel].address;
return 0;
}
int ipmi_request_settime(struct ipmi_user *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, index;
if (!user)
return -EINVAL;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
rv = check_addr(user->intf, addr, &saddr, &lun);
if (!rv)
rv = i_ipmi_request(user,
user->intf,
addr,
msgid,
msg,
user_msg_data,
NULL, NULL,
priority,
saddr,
lun,
retries,
retry_time_ms);
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_request_settime);
int ipmi_request_supply_msgs(struct ipmi_user *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, index;
if (!user)
return -EINVAL;
user = acquire_ipmi_user(user, &index);
if (!user)
return -ENODEV;
rv = check_addr(user->intf, addr, &saddr, &lun);
if (!rv)
rv = i_ipmi_request(user,
user->intf,
addr,
msgid,
msg,
user_msg_data,
supplied_smi,
supplied_recv,
priority,
saddr,
lun,
-1, 0);
release_ipmi_user(user, index);
return rv;
}
EXPORT_SYMBOL(ipmi_request_supply_msgs);
static void bmc_device_id_handler(struct ipmi_smi *intf,
struct ipmi_recv_msg *msg)
{
int rv;
if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
|| (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE)
|| (msg->msg.cmd != IPMI_GET_DEVICE_ID_CMD)) {
dev_warn(intf->si_dev,
"invalid device_id msg: addr_type=%d netfn=%x cmd=%x\n",
msg->addr.addr_type, msg->msg.netfn, msg->msg.cmd);
return;
}
rv = ipmi_demangle_device_id(msg->msg.netfn, msg->msg.cmd,
msg->msg.data, msg->msg.data_len, &intf->bmc->fetch_id);
if (rv) {
dev_warn(intf->si_dev, "device id demangle failed: %d\n", rv);
/* record completion code when error */
intf->bmc->cc = msg->msg.data[0];
intf->bmc->dyn_id_set = 0;
} else {
/*
* Make sure the id data is available before setting
* dyn_id_set.
*/
smp_wmb();
intf->bmc->dyn_id_set = 1;
}
wake_up(&intf->waitq);
}
static int
send_get_device_id_cmd(struct ipmi_smi *intf)
{
struct ipmi_system_interface_addr si;
struct kernel_ipmi_msg msg;
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_ID_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->addrinfo[0].address,
intf->addrinfo[0].lun,
-1, 0);
}
static int __get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc)
{
int rv;
unsigned int retry_count = 0;
intf->null_user_handler = bmc_device_id_handler;
retry:
bmc->cc = 0;
bmc->dyn_id_set = 2;
rv = send_get_device_id_cmd(intf);
if (rv)
goto out_reset_handler;
wait_event(intf->waitq, bmc->dyn_id_set != 2);
if (!bmc->dyn_id_set) {
if (bmc->cc != IPMI_CC_NO_ERROR &&
++retry_count <= GET_DEVICE_ID_MAX_RETRY) {
msleep(500);
dev_warn(intf->si_dev,
"BMC returned 0x%2.2x, retry get bmc device id\n",
bmc->cc);
goto retry;
}
rv = -EIO; /* Something went wrong in the fetch. */
}
/* dyn_id_set makes the id data available. */
smp_rmb();
out_reset_handler:
intf->null_user_handler = NULL;
return rv;
}
/*
* Fetch the device id for the bmc/interface. You must pass in either
* bmc or intf, this code will get the other one. If the data has
* been recently fetched, this will just use the cached data. Otherwise
* it will run a new fetch.
*
* Except for the first time this is called (in ipmi_add_smi()),
* this will always return good data;
*/
static int __bmc_get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc,
struct ipmi_device_id *id,
bool *guid_set, guid_t *guid, int intf_num)
{
int rv = 0;
int prev_dyn_id_set, prev_guid_set;
bool intf_set = intf != NULL;
if (!intf) {
mutex_lock(&bmc->dyn_mutex);
retry_bmc_lock:
if (list_empty(&bmc->intfs)) {
mutex_unlock(&bmc->dyn_mutex);
return -ENOENT;
}
intf = list_first_entry(&bmc->intfs, struct ipmi_smi,
bmc_link);
kref_get(&intf->refcount);
mutex_unlock(&bmc->dyn_mutex);
mutex_lock(&intf->bmc_reg_mutex);
mutex_lock(&bmc->dyn_mutex);
if (intf != list_first_entry(&bmc->intfs, struct ipmi_smi,
bmc_link)) {
mutex_unlock(&intf->bmc_reg_mutex);
kref_put(&intf->refcount, intf_free);
goto retry_bmc_lock;
}
} else {
mutex_lock(&intf->bmc_reg_mutex);
bmc = intf->bmc;
mutex_lock(&bmc->dyn_mutex);
kref_get(&intf->refcount);
}
/* If we have a valid and current ID, just return that. */
if (intf->in_bmc_register ||
(bmc->dyn_id_set && time_is_after_jiffies(bmc->dyn_id_expiry)))
goto out_noprocessing;
prev_guid_set = bmc->dyn_guid_set;
__get_guid(intf);
prev_dyn_id_set = bmc->dyn_id_set;
rv = __get_device_id(intf, bmc);
if (rv)
goto out;
/*
* The guid, device id, manufacturer id, and product id should
* not change on a BMC. If it does we have to do some dancing.
*/
if (!intf->bmc_registered
|| (!prev_guid_set && bmc->dyn_guid_set)
|| (!prev_dyn_id_set && bmc->dyn_id_set)
|| (prev_guid_set && bmc->dyn_guid_set
&& !guid_equal(&bmc->guid, &bmc->fetch_guid))
|| bmc->id.device_id != bmc->fetch_id.device_id
|| bmc->id.manufacturer_id != bmc->fetch_id.manufacturer_id
|| bmc->id.product_id != bmc->fetch_id.product_id) {
struct ipmi_device_id id = bmc->fetch_id;
int guid_set = bmc->dyn_guid_set;
guid_t guid;
guid = bmc->fetch_guid;
mutex_unlock(&bmc->dyn_mutex);
__ipmi_bmc_unregister(intf);
/* Fill in the temporary BMC for good measure. */
intf->bmc->id = id;
intf->bmc->dyn_guid_set = guid_set;
intf->bmc->guid = guid;
if (__ipmi_bmc_register(intf, &id, guid_set, &guid, intf_num))
need_waiter(intf); /* Retry later on an error. */
else
__scan_channels(intf, &id);
if (!intf_set) {
/*
* We weren't given the interface on the
* command line, so restart the operation on
* the next interface for the BMC.
*/
mutex_unlock(&intf->bmc_reg_mutex);
mutex_lock(&bmc->dyn_mutex);
goto retry_bmc_lock;
}
/* We have a new BMC, set it up. */
bmc = intf->bmc;
mutex_lock(&bmc->dyn_mutex);
goto out_noprocessing;
} else if (memcmp(&bmc->fetch_id, &bmc->id, sizeof(bmc->id)))
/* Version info changes, scan the channels again. */
__scan_channels(intf, &bmc->fetch_id);
bmc->dyn_id_expiry = jiffies + IPMI_DYN_DEV_ID_EXPIRY;
out:
if (rv && prev_dyn_id_set) {
rv = 0; /* Ignore failures if we have previous data. */
bmc->dyn_id_set = prev_dyn_id_set;
}
if (!rv) {
bmc->id = bmc->fetch_id;
if (bmc->dyn_guid_set)
bmc->guid = bmc->fetch_guid;
else if (prev_guid_set)
/*
* The guid used to be valid and it failed to fetch,
* just use the cached value.
*/
bmc->dyn_guid_set = prev_guid_set;
}
out_noprocessing:
if (!rv) {
if (id)
*id = bmc->id;
if (guid_set)
*guid_set = bmc->dyn_guid_set;
if (guid && bmc->dyn_guid_set)
*guid = bmc->guid;
}
mutex_unlock(&bmc->dyn_mutex);
mutex_unlock(&intf->bmc_reg_mutex);
kref_put(&intf->refcount, intf_free);
return rv;
}
static int bmc_get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc,
struct ipmi_device_id *id,
bool *guid_set, guid_t *guid)
{
return __bmc_get_device_id(intf, bmc, id, guid_set, guid, -1);
}
static ssize_t device_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 10, "%u\n", id.device_id);
}
static DEVICE_ATTR_RO(device_id);
static ssize_t provides_device_sdrs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 10, "%u\n", (id.device_revision & 0x80) >> 7);
}
static DEVICE_ATTR_RO(provides_device_sdrs);
static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 20, "%u\n", id.device_revision & 0x0F);
}
static DEVICE_ATTR_RO(revision);
static ssize_t firmware_revision_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 20, "%u.%x\n", id.firmware_revision_1,
id.firmware_revision_2);
}
static DEVICE_ATTR_RO(firmware_revision);
static ssize_t ipmi_version_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 20, "%u.%u\n",
ipmi_version_major(&id),
ipmi_version_minor(&id));
}
static DEVICE_ATTR_RO(ipmi_version);
static ssize_t add_dev_support_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 10, "0x%02x\n", 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);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 20, "0x%6.6x\n", id.manufacturer_id);
}
static DEVICE_ATTR_RO(manufacturer_id);
static ssize_t product_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 10, "0x%4.4x\n", id.product_id);
}
static DEVICE_ATTR_RO(product_id);
static ssize_t aux_firmware_rev_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct bmc_device *bmc = to_bmc_device(dev);
struct ipmi_device_id id;
int rv;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
if (rv)
return rv;
return snprintf(buf, 21, "0x%02x 0x%02x 0x%02x 0x%02x\n",
id.aux_firmware_revision[3],
id.aux_firmware_revision[2],
id.aux_firmware_revision[1],
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);
bool guid_set;
guid_t guid;
int rv;
rv = bmc_get_device_id(NULL, bmc, NULL, &guid_set, &guid);
if (rv)
return rv;
if (!guid_set)
return -ENOENT;
return snprintf(buf, UUID_STRING_LEN + 1 + 1, "%pUl\n", &guid);
}
static DEVICE_ATTR_RO(guid);
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;
int rv;
if (attr == &dev_attr_aux_firmware_revision.attr) {
struct ipmi_device_id id;
rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL);
return (!rv && id.aux_firmware_revision_set) ? mode : 0;
}
if (attr == &dev_attr_guid.attr) {
bool guid_set;
rv = bmc_get_device_id(NULL, bmc, NULL, &guid_set, NULL);
return (!rv && 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 int __find_bmc_guid(struct device *dev, const void *data)
{
const guid_t *guid = data;
struct bmc_device *bmc;
int rv;
if (dev->type != &bmc_device_type)
return 0;
bmc = to_bmc_device(dev);
rv = bmc->dyn_guid_set && guid_equal(&bmc->guid, guid);
if (rv)
rv = kref_get_unless_zero(&bmc->usecount);
return rv;
}
/*
* Returns with the bmc's usecount incremented, if it is non-NULL.
*/
static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv,
guid_t *guid)
{
struct device *dev;
struct bmc_device *bmc = NULL;
dev = driver_find_device(drv, NULL, guid, __find_bmc_guid);
if (dev) {
bmc = to_bmc_device(dev);
put_device(dev);
}
return bmc;
}
struct prod_dev_id {
unsigned int product_id;
unsigned char device_id;
};
static int __find_bmc_prod_dev_id(struct device *dev, const void *data)
{
const struct prod_dev_id *cid = data;
struct bmc_device *bmc;
int rv;
if (dev->type != &bmc_device_type)
return 0;
bmc = to_bmc_device(dev);
rv = (bmc->id.product_id == cid->product_id
&& bmc->id.device_id == cid->device_id);
if (rv)
rv = kref_get_unless_zero(&bmc->usecount);
return rv;
}
/*
* Returns with the bmc's usecount incremented, if it is non-NULL.
*/
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;
struct bmc_device *bmc = NULL;
dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id);
if (dev) {
bmc = to_bmc_device(dev);
put_device(dev);
}
return bmc;
}
static DEFINE_IDA(ipmi_bmc_ida);
static void
release_bmc_device(struct device *dev)
{
kfree(to_bmc_device(dev));
}
static void cleanup_bmc_work(struct work_struct *work)
{
struct bmc_device *bmc = container_of(work, struct bmc_device,
remove_work);
int id = bmc->pdev.id; /* Unregister overwrites id */
platform_device_unregister(&bmc->pdev);
ida_simple_remove(&ipmi_bmc_ida, id);
}
static void
cleanup_bmc_device(struct kref *ref)
{
struct bmc_device *bmc = container_of(ref, struct bmc_device, usecount);
/*
* Remove the platform device in a work queue to avoid issues
* with removing the device attributes while reading a device
* attribute.
*/
schedule_work(&bmc->remove_work);
}
/*
* Must be called with intf->bmc_reg_mutex held.
*/
static void __ipmi_bmc_unregister(struct ipmi_smi *intf)
{
struct bmc_device *bmc = intf->bmc;
if (!intf->bmc_registered)
return;
sysfs_remove_link(&intf->si_dev->kobj, "bmc");
sysfs_remove_link(&bmc->pdev.dev.kobj, intf->my_dev_name);
kfree(intf->my_dev_name);
intf->my_dev_name = NULL;
mutex_lock(&bmc->dyn_mutex);
list_del(&intf->bmc_link);
mutex_unlock(&bmc->dyn_mutex);
intf->bmc = &intf->tmp_bmc;
kref_put(&bmc->usecount, cleanup_bmc_device);
intf->bmc_registered = false;
}
static void ipmi_bmc_unregister(struct ipmi_smi *intf)
{
mutex_lock(&intf->bmc_reg_mutex);
__ipmi_bmc_unregister(intf);
mutex_unlock(&intf->bmc_reg_mutex);
}
/*
* Must be called with intf->bmc_reg_mutex held.
*/
static int __ipmi_bmc_register(struct ipmi_smi *intf,
struct ipmi_device_id *id,
bool guid_set, guid_t *guid, int intf_num)
{
int rv;
struct bmc_device *bmc;
struct bmc_device *old_bmc;
/*
* platform_device_register() can cause bmc_reg_mutex to
* be claimed because of the is_visible functions of
* the attributes. Eliminate possible recursion and
* release the lock.
*/
intf->in_bmc_register = true;
mutex_unlock(&intf->bmc_reg_mutex);
/*
* Try to find if there is an bmc_device struct
* representing the interfaced BMC already
*/
mutex_lock(&ipmidriver_mutex);
if (guid_set)
old_bmc = ipmi_find_bmc_guid(&ipmidriver.driver, guid);
else
old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
id->product_id,
id->device_id);
/*
* If there is already an bmc_device, free the new one,
* otherwise register the new BMC device
*/
if (old_bmc) {
bmc = old_bmc;
/*
* Note: old_bmc already has usecount incremented by
* the BMC find functions.
*/
intf->bmc = old_bmc;
mutex_lock(&bmc->dyn_mutex);
list_add_tail(&intf->bmc_link, &bmc->intfs);
mutex_unlock(&bmc->dyn_mutex);
dev_info(intf->si_dev,
"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 {
bmc = kzalloc(sizeof(*bmc), GFP_KERNEL);
if (!bmc) {
rv = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&bmc->intfs);
mutex_init(&bmc->dyn_mutex);
INIT_WORK(&bmc->remove_work, cleanup_bmc_work);
bmc->id = *id;
bmc->dyn_id_set = 1;
bmc->dyn_guid_set = guid_set;
bmc->guid = *guid;
bmc->dyn_id_expiry = jiffies + IPMI_DYN_DEV_ID_EXPIRY;
bmc->pdev.name = "ipmi_bmc";
rv = ida_simple_get(&ipmi_bmc_ida, 0, 0, GFP_KERNEL);
if (rv < 0) {
kfree(bmc);
goto out;
}
bmc->pdev.dev.driver = &ipmidriver.driver;
bmc->pdev.id = rv;
bmc->pdev.dev.release = release_bmc_device;
bmc->pdev.dev.type = &bmc_device_type;
kref_init(&bmc->usecount);
intf->bmc = bmc;
mutex_lock(&bmc->dyn_mutex);
list_add_tail(&intf->bmc_link, &bmc->intfs);
mutex_unlock(&bmc->dyn_mutex);
rv = platform_device_register(&bmc->pdev);
if (rv) {
dev_err(intf->si_dev,
"Unable to register bmc device: %d\n",
rv);
goto out_list_del;
}
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) {
dev_err(intf->si_dev, "Unable to create bmc symlink: %d\n", rv);
goto out_put_bmc;
}
if (intf_num == -1)
intf_num = intf->intf_num;
intf->my_dev_name = kasprintf(GFP_KERNEL, "ipmi%d", intf_num);
if (!intf->my_dev_name) {
rv = -ENOMEM;
dev_err(intf->si_dev, "Unable to allocate link from BMC: %d\n",
rv);
goto out_unlink1;
}
rv = sysfs_create_link(&bmc->pdev.dev.kobj, &intf->si_dev->kobj,
intf->my_dev_name);
if (rv) {
dev_err(intf->si_dev, "Unable to create symlink to bmc: %d\n",
rv);
goto out_free_my_dev_name;
}
intf->bmc_registered = true;
out:
mutex_unlock(&ipmidriver_mutex);
mutex_lock(&intf->bmc_reg_mutex);
intf->in_bmc_register = false;
return rv;
out_free_my_dev_name:
kfree(intf->my_dev_name);
intf->my_dev_name = NULL;
out_unlink1:
sysfs_remove_link(&intf->si_dev->kobj, "bmc");
out_put_bmc:
mutex_lock(&bmc->dyn_mutex);
list_del(&intf->bmc_link);
mutex_unlock(&bmc->dyn_mutex);
intf->bmc = &intf->tmp_bmc;
kref_put(&bmc->usecount, cleanup_bmc_device);
goto out;
out_list_del:
mutex_lock(&bmc->dyn_mutex);
list_del(&intf->bmc_link);
mutex_unlock(&bmc->dyn_mutex);
intf->bmc = &intf->tmp_bmc;
put_device(&bmc->pdev.dev);
goto out;
}
static int
send_guid_cmd(struct ipmi_smi *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->addrinfo[0].address,
intf->addrinfo[0].lun,
-1, 0);
}
static void guid_handler(struct ipmi_smi *intf, struct ipmi_recv_msg *msg)
{
struct bmc_device *bmc = intf->bmc;
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. */
bmc->dyn_guid_set = 0;
goto out;
}
if (msg->msg.data_len < UUID_SIZE + 1) {
bmc->dyn_guid_set = 0;
dev_warn(intf->si_dev,
"The GUID response from the BMC was too short, it was %d but should have been %d. Assuming GUID is not available.\n",
msg->msg.data_len, UUID_SIZE + 1);
goto out;
}
import_guid(&bmc->fetch_guid, msg->msg.data + 1);
/*
* Make sure the guid data is available before setting
* dyn_guid_set.
*/
smp_wmb();
bmc->dyn_guid_set = 1;
out:
wake_up(&intf->waitq);
}
static void __get_guid(struct ipmi_smi *intf)
{
int rv;
struct bmc_device *bmc = intf->bmc;
bmc->dyn_guid_set = 2;
intf->null_user_handler = guid_handler;
rv = send_guid_cmd(intf, 0);
if (rv)
/* Send failed, no GUID available. */
bmc->dyn_guid_set = 0;
else
wait_event(intf->waitq, bmc->dyn_guid_set != 2);
/* dyn_guid_set makes the guid data available. */
smp_rmb();
intf->null_user_handler = NULL;
}
static int
send_channel_info_cmd(struct ipmi_smi *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->addrinfo[0].address,
intf->addrinfo[0].lun,
-1, 0);
}
static void
channel_handler(struct ipmi_smi *intf, struct ipmi_recv_msg *msg)
{
int rv = 0;
int ch;
unsigned int set = intf->curr_working_cset;
struct ipmi_channel *chans;
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->wchannels[set].c[0].medium
= IPMI_CHANNEL_MEDIUM_IPMB;
intf->wchannels[set].c[0].protocol
= IPMI_CHANNEL_PROTOCOL_IPMB;
intf->channel_list = intf->wchannels + set;
intf->channels_ready = true;
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;
}
ch = intf->curr_channel;
chans = intf->wchannels[set].c;
chans[ch].medium = msg->msg.data[2] & 0x7f;
chans[ch].protocol = msg->msg.data[3] & 0x1f;
next_channel:
intf->curr_channel++;
if (intf->curr_channel >= IPMI_MAX_CHANNELS) {
intf->channel_list = intf->wchannels + set;
intf->channels_ready = true;
wake_up(&intf->waitq);
} else {
intf->channel_list = intf->wchannels + set;
intf->channels_ready = true;
rv = send_channel_info_cmd(intf, intf->curr_channel);
}
if (rv) {
/* Got an error somehow, just give up. */
dev_warn(intf->si_dev,
"Error sending channel information for channel %d: %d\n",
intf->curr_channel, rv);
intf->channel_list = intf->wchannels + set;
intf->channels_ready = true;
wake_up(&intf->waitq);
}
}
out:
return;
}
/*
* Must be holding intf->bmc_reg_mutex to call this.
*/
static int __scan_channels(struct ipmi_smi *intf, struct ipmi_device_id *id)
{
int rv;
if (ipmi_version_major(id) > 1
|| (ipmi_version_major(id) == 1
&& ipmi_version_minor(id) >= 5)) {
unsigned int set;
/*
* Start scanning the channels to see what is
* available.
*/
set = !intf->curr_working_cset;
intf->curr_working_cset = set;
memset(&intf->wchannels[set], 0,
sizeof(struct ipmi_channel_set));
intf->null_user_handler = channel_handler;
intf->curr_channel = 0;
rv = send_channel_info_cmd(intf, 0);
if (rv) {
dev_warn(intf->si_dev,
"Error sending channel information for channel 0, %d\n",
rv);
intf->null_user_handler = NULL;
return -EIO;
}
/* Wait for the channel info to be read. */
wait_event(intf->waitq, intf->channels_ready);
intf->null_user_handler = NULL;
} else {
unsigned int set = intf->curr_working_cset;
/* Assume a single IPMB channel at zero. */
intf->wchannels[set].c[0].medium = IPMI_CHANNEL_MEDIUM_IPMB;
intf->wchannels[set].c[0].protocol = IPMI_CHANNEL_PROTOCOL_IPMB;
intf->channel_list = intf->wchannels + set;
intf->channels_ready = true;
}
return 0;
}
static void ipmi_poll(struct ipmi_smi *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(struct ipmi_user *user)
{
ipmi_poll(user->intf);
}
EXPORT_SYMBOL(ipmi_poll_interface);
static void redo_bmc_reg(struct work_struct *work)
{
struct ipmi_smi *intf = container_of(work, struct ipmi_smi,
bmc_reg_work);
if (!intf->in_shutdown)
bmc_get_device_id(intf, NULL, NULL, NULL, NULL);
kref_put(&intf->refcount, intf_free);
}
int ipmi_add_smi(struct module *owner,
const struct ipmi_smi_handlers *handlers,
void *send_info,
struct device *si_dev,
unsigned char slave_addr)
{
int i, j;
int rv;
struct ipmi_smi *intf, *tintf;
struct list_head *link;
struct ipmi_device_id id;
/*
* Make sure the driver is actually initialized, this handles
* problems with initialization order.
*/
rv = ipmi_init_msghandler();
if (rv)
return rv;
intf = kzalloc(sizeof(*intf), GFP_KERNEL);
if (!intf)
return -ENOMEM;
rv = init_srcu_struct(&intf->users_srcu);
if (rv) {
kfree(intf);
return rv;
}
intf->owner = owner;
intf->bmc = &intf->tmp_bmc;
INIT_LIST_HEAD(&intf->bmc->intfs);
mutex_init(&intf->bmc->dyn_mutex);
INIT_LIST_HEAD(&intf->bmc_link);
mutex_init(&intf->bmc_reg_mutex);
intf->intf_num = -1; /* Mark it invalid for now. */
kref_init(&intf->refcount);
INIT_WORK(&intf->bmc_reg_work, redo_bmc_reg);
intf->si_dev = si_dev;
for (j = 0; j < IPMI_MAX_CHANNELS; j++) {
intf->addrinfo[j].address = IPMI_BMC_SLAVE_ADDR;
intf->addrinfo[j].lun = 2;
}
if (slave_addr != 0)
intf->addrinfo[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;
spin_lock_init(&intf->waiting_rcv_msgs_lock);
INIT_LIST_HEAD(&intf->waiting_rcv_msgs);
tasklet_setup(&intf->recv_tasklet,
smi_recv_tasklet);
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);
spin_lock_init(&intf->watch_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);
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,
ipmi_interfaces_mutex_held()) {
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_err;
rv = __bmc_get_device_id(intf, NULL, &id, NULL, NULL, i);
if (rv) {
dev_err(si_dev, "Unable to get the device id: %d\n", rv);
goto out_err_started;
}
mutex_lock(&intf->bmc_reg_mutex);
rv = __scan_channels(intf, &id);
mutex_unlock(&intf->bmc_reg_mutex);
if (rv)
goto out_err_bmc_reg;
/*
* 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);
return 0;
out_err_bmc_reg:
ipmi_bmc_unregister(intf);
out_err_started:
if (intf->handlers->shutdown)
intf->handlers->shutdown(intf->send_info);
out_err:
list_del_rcu(&intf->link);
mutex_unlock(&ipmi_interfaces_mutex);
synchronize_srcu(&ipmi_interfaces_srcu);
cleanup_srcu_struct(&intf->users_srcu);
kref_put(&intf->refcount, intf_free);
return rv;
}
EXPORT_SYMBOL(ipmi_add_smi);
static void deliver_smi_err_response(struct ipmi_smi *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(struct ipmi_smi *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(intf, ent->recv_msg, IPMI_ERR_UNSPECIFIED);
}
}
void ipmi_unregister_smi(struct ipmi_smi *intf)
{
struct ipmi_smi_watcher *w;
int intf_num = intf->intf_num, index;
mutex_lock(&ipmi_interfaces_mutex);
intf->intf_num = -1;
intf->in_shutdown = true;
list_del_rcu(&intf->link);
mutex_unlock(&ipmi_interfaces_mutex);
synchronize_srcu(&ipmi_interfaces_srcu);
/* At this point no users can be added to the interface. */
/*
* Call all the watcher interfaces to tell them that
* an interface is going away.
*/
mutex_lock(&smi_watchers_mutex);
list_for_each_entry(w, &smi_watchers, link)
w->smi_gone(intf_num);
mutex_unlock(&smi_watchers_mutex);
index = srcu_read_lock(&intf->users_srcu);
while (!list_empty(&intf->users)) {
struct ipmi_user *user =
container_of(list_next_rcu(&intf->users),
struct ipmi_user, link);
_ipmi_destroy_user(user);
}
srcu_read_unlock(&intf->users_srcu, index);
if (intf->handlers->shutdown)
intf->handlers->shutdown(intf->send_info);
cleanup_smi_msgs(intf);
ipmi_bmc_unregister(intf);
cleanup_srcu_struct(&intf->users_srcu);
kref_put(&intf->refcount, intf_free);
}
EXPORT_SYMBOL(ipmi_unregister_smi);
static int handle_ipmb_get_msg_rsp(struct ipmi_smi *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;
if (deliver_response(intf, recv_msg))
ipmi_inc_stat(intf, unhandled_ipmb_responses);
else
ipmi_inc_stat(intf, handled_ipmb_responses);
return 0;
}
static int handle_ipmb_get_msg_cmd(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
struct cmd_rcvr *rcvr;
int rv = 0;
unsigned char netfn;
unsigned char cmd;
unsigned char chan;
struct ipmi_user *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->addrinfo[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;
pr_debug("Invalid command: %*ph\n", msg->data_size, msg->data);
rcu_read_lock();
if (!intf->in_shutdown) {
smi_send(intf, intf->handlers, msg, 0);
/*
* We used the message, so return the value
* that causes it to not be freed or
* queued.
*/
rv = -1;
}
rcu_read_unlock();
} else {
recv_msg = ipmi_alloc_recv_msg();
if (!recv_msg) {
/*
* We couldn't allocate memory for the
* message, so requeue it for handling
* later.
*/
rv = 1;
kref_put(&user->refcount, free_user);
} else {
/* Extract the source address from the data. */
ipmb_addr = (struct ipmi_ipmb_addr *) &recv_msg->addr;
ipmb_addr->addr_type = IPMI_IPMB_ADDR_TYPE;
ipmb_addr->slave_addr = msg->rsp[6];
ipmb_addr->lun = msg->rsp[7] & 3;
ipmb_addr->channel = msg->rsp[3] & 0xf;
/*
* Extract the rest of the message information
* from the IPMB header.
*/
recv_msg->user = user;
recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
recv_msg->msgid = msg->rsp[7] >> 2;
recv_msg->msg.netfn = msg->rsp[4] >> 2;
recv_msg->msg.cmd = msg->rsp[8];
recv_msg->msg.data = recv_msg->msg_data;
/*
* We chop off 10, not 9 bytes because the checksum
* at the end also needs to be removed.
*/
recv_msg->msg.data_len = msg->rsp_size - 10;
memcpy(recv_msg->msg_data, &msg->rsp[9],
msg->rsp_size - 10);
if (deliver_response(intf, recv_msg))
ipmi_inc_stat(intf, unhandled_commands);
else
ipmi_inc_stat(intf, handled_commands);
}
}
return rv;
}
static int handle_lan_get_msg_rsp(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
struct ipmi_lan_addr lan_addr;
struct ipmi_recv_msg *recv_msg;
/*
* This is 13, not 12, because the response must contain a
* completion code.
*/
if (msg->rsp_size < 13) {
/* Message not big enough, just ignore it. */
ipmi_inc_stat(intf, invalid_lan_responses);
return 0;
}
if (msg->rsp[2] != 0) {
/* An error getting the response, just ignore it. */
return 0;
}
lan_addr.addr_type = IPMI_LAN_ADDR_TYPE;
lan_addr.session_handle = msg->rsp[4];
lan_addr.remote_SWID = msg->rsp[8];
lan_addr.local_SWID = msg->rsp[5];
lan_addr.channel = msg->rsp[3] & 0x0f;
lan_addr.privilege = msg->rsp[3] >> 4;
lan_addr.lun = msg->rsp[9] & 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[9] >> 2,
msg->rsp[3] & 0x0f,
msg->rsp[10],
(msg->rsp[6] >> 2) & (~1),
(struct ipmi_addr *) &lan_addr,
&recv_msg)) {
/*
* We were unable to find the sequence number,
* so just nuke the message.
*/
ipmi_inc_stat(intf, unhandled_lan_responses);
return 0;
}
memcpy(recv_msg->msg_data, &msg->rsp[11], msg->rsp_size - 11);
/*
* 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[6] >> 2;
recv_msg->msg.data = recv_msg->msg_data;
recv_msg->msg.data_len = msg->rsp_size - 12;
recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
if (deliver_response(intf, recv_msg))
ipmi_inc_stat(intf, unhandled_lan_responses);
else
ipmi_inc_stat(intf, handled_lan_responses);
return 0;
}
static int handle_lan_get_msg_cmd(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
struct cmd_rcvr *rcvr;
int rv = 0;
unsigned char netfn;
unsigned char cmd;
unsigned char chan;
struct ipmi_user *user = NULL;
struct ipmi_lan_addr *lan_addr;
struct ipmi_recv_msg *recv_msg;
if (msg->rsp_size < 12) {
/* 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[6] >> 2;
cmd = msg->rsp[10];
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, just give up. */
ipmi_inc_stat(intf, unhandled_commands);
/*
* Don't do anything with these messages, just allow
* them to be freed.
*/
rv = 0;
} else {
recv_msg = ipmi_alloc_recv_msg();
if (!recv_msg) {
/*
* We couldn't allocate memory for the
* message, so requeue it for handling later.
*/
rv = 1;
kref_put(&user->refcount, free_user);
} else {
/* Extract the source address from the data. */
lan_addr = (struct ipmi_lan_addr *) &recv_msg->addr;
lan_addr->addr_type = IPMI_LAN_ADDR_TYPE;
lan_addr->session_handle = msg->rsp[4];
lan_addr->remote_SWID = msg->rsp[8];
lan_addr->local_SWID = msg->rsp[5];
lan_addr->lun = msg->rsp[9] & 3;
lan_addr->channel = msg->rsp[3] & 0xf;
lan_addr->privilege = msg->rsp[3] >> 4;
/*
* Extract the rest of the message information
* from the IPMB header.
*/
recv_msg->user = user;
recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
recv_msg->msgid = msg->rsp[9] >> 2;
recv_msg->msg.netfn = msg->rsp[6] >> 2;
recv_msg->msg.cmd = msg->rsp[10];
recv_msg->msg.data = recv_msg->msg_data;
/*
* We chop off 12, not 11 bytes because the checksum
* at the end also needs to be removed.
*/
recv_msg->msg.data_len = msg->rsp_size - 12;
memcpy(recv_msg->msg_data, &msg->rsp[11],
msg->rsp_size - 12);
if (deliver_response(intf, recv_msg))
ipmi_inc_stat(intf, unhandled_commands);
else
ipmi_inc_stat(intf, handled_commands);
}
}
return rv;
}
/*
* This routine will handle "Get Message" command responses with
* channels that use an OEM Medium. The message format belongs to
* the OEM. See IPMI 2.0 specification, Chapter 6 and
* Chapter 22, sections 22.6 and 22.24 for more details.
*/
static int handle_oem_get_msg_cmd(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
struct cmd_rcvr *rcvr;
int rv = 0;
unsigned char netfn;
unsigned char cmd;
unsigned char chan;
struct ipmi_user *user = NULL;
struct ipmi_system_interface_addr *smi_addr;
struct ipmi_recv_msg *recv_msg;
/*
* We expect the OEM SW to perform error checking
* so we just do some basic sanity checks
*/
if (msg->rsp_size < 4) {
/* 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;
}
/*
* This is an OEM Message so the OEM needs to know how
* handle the message. We do no interpretation.
*/
netfn = msg->rsp[0] >> 2;
cmd = msg->rsp[1];
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, just give up. */
ipmi_inc_stat(intf, unhandled_commands);
/*
* Don't do anything with these messages, just allow
* them to be freed.
*/
rv = 0;
} else {
recv_msg = ipmi_alloc_recv_msg();
if (!recv_msg) {
/*
* We couldn't allocate memory for the
* message, so requeue it for handling
* later.
*/
rv = 1;
kref_put(&user->refcount, free_user);
} else {
/*
* OEM Messages are expected to be delivered via
* the system interface to SMS software. We might
* need to visit this again depending on OEM
* requirements
*/
smi_addr = ((struct ipmi_system_interface_addr *)
&recv_msg->addr);
smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
smi_addr->channel = IPMI_BMC_CHANNEL;
smi_addr->lun = msg->rsp[0] & 3;
recv_msg->user = user;
recv_msg->user_msg_data = NULL;
recv_msg->recv_type = IPMI_OEM_RECV_TYPE;
recv_msg->msg.netfn = msg->rsp[0] >> 2;
recv_msg->msg.cmd = msg->rsp[1];
recv_msg->msg.data = recv_msg->msg_data;
/*
* The message starts at byte 4 which follows the
* the Channel Byte in the "GET MESSAGE" command
*/
recv_msg->msg.data_len = msg->rsp_size - 4;
memcpy(recv_msg->msg_data, &msg->rsp[4],
msg->rsp_size - 4);
if (deliver_response(intf, recv_msg))
ipmi_inc_stat(intf, unhandled_commands);
else
ipmi_inc_stat(intf, handled_commands);
}
}
return rv;
}
static void copy_event_into_recv_msg(struct ipmi_recv_msg *recv_msg,
struct ipmi_smi_msg *msg)
{
struct ipmi_system_interface_addr *smi_addr;
recv_msg->msgid = 0;
smi_addr = (struct ipmi_system_interface_addr *) &recv_msg->addr;
smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
smi_addr->channel = IPMI_BMC_CHANNEL;
smi_addr->lun = msg->rsp[0] & 3;
recv_msg->recv_type = IPMI_ASYNC_EVENT_RECV_TYPE;
recv_msg->msg.netfn = msg->rsp[0] >> 2;
recv_msg->msg.cmd = msg->rsp[1];
memcpy(recv_msg->msg_data, &msg->rsp[3], msg->rsp_size - 3);
recv_msg->msg.data = recv_msg->msg_data;
recv_msg->msg.data_len = msg->rsp_size - 3;
}
static int handle_read_event_rsp(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
struct ipmi_recv_msg *recv_msg, *recv_msg2;
struct list_head msgs;
struct ipmi_user *user;
int rv = 0, deliver_count = 0, index;
unsigned long flags;
if (msg->rsp_size < 19) {
/* Message is too small to be an IPMB event. */
ipmi_inc_stat(intf, invalid_events);
return 0;
}
if (msg->rsp[2] != 0) {
/* An error getting the event, just ignore it. */
return 0;
}
INIT_LIST_HEAD(&msgs);
spin_lock_irqsave(&intf->events_lock, flags);
ipmi_inc_stat(intf, events);
/*
* Allocate and fill in one message for every user that is
* getting events.
*/
index = srcu_read_lock(&intf->users_srcu);
list_for_each_entry_rcu(user, &intf->users, link) {
if (!user->gets_events)
continue;
recv_msg = ipmi_alloc_recv_msg();
if (!recv_msg) {
rcu_read_unlock();
list_for_each_entry_safe(recv_msg, recv_msg2, &msgs,
link) {
list_del(&recv_msg->link);
ipmi_free_recv_msg(recv_msg);
}
/*
* We couldn't allocate memory for the
* message, so requeue it for handling
* later.
*/
rv = 1;
goto out;
}
deliver_count++;
copy_event_into_recv_msg(recv_msg, msg);
recv_msg->user = user;
kref_get(&user->refcount);
list_add_tail(&recv_msg->link, &msgs);
}
srcu_read_unlock(&intf->users_srcu, index);
if (deliver_count) {
/* Now deliver all the messages. */
list_for_each_entry_safe(recv_msg, recv_msg2, &msgs, link) {
list_del(&recv_msg->link);
deliver_local_response(intf, recv_msg);
}
} else if (intf->waiting_events_count < MAX_EVENTS_IN_QUEUE) {
/*
* No one to receive the message, put it in queue if there's
* not already too many things in the queue.
*/
recv_msg = ipmi_alloc_recv_msg();
if (!recv_msg) {
/*
* We couldn't allocate memory for the
* message, so requeue it for handling
* later.
*/
rv = 1;
goto out;
}
copy_event_into_recv_msg(recv_msg, msg);
list_add_tail(&recv_msg->link, &intf->waiting_events);
intf->waiting_events_count++;
} else if (!intf->event_msg_printed) {
/*
* There's too many things in the queue, discard this
* message.
*/
dev_warn(intf->si_dev,
"Event queue full, discarding incoming events\n");
intf->event_msg_printed = 1;
}
out:
spin_unlock_irqrestore(&intf->events_lock, flags);
return rv;
}
static int handle_bmc_rsp(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
struct ipmi_recv_msg *recv_msg;
struct ipmi_system_interface_addr *smi_addr;
recv_msg = (struct ipmi_recv_msg *) msg->user_data;
if (recv_msg == NULL) {
dev_warn(intf->si_dev,
"IPMI message received with no owner. This could be because of a malformed message, or because of a hardware error. Contact your hardware vendor for assistance.\n");
return 0;
}
recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
recv_msg->msgid = msg->msgid;
smi_addr = ((struct ipmi_system_interface_addr *)
&recv_msg->addr);
smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
smi_addr->channel = IPMI_BMC_CHANNEL;
smi_addr->lun = msg->rsp[0] & 3;
recv_msg->msg.netfn = msg->rsp[0] >> 2;
recv_msg->msg.cmd = msg->rsp[1];
memcpy(recv_msg->msg_data, &msg->rsp[2], msg->rsp_size - 2);
recv_msg->msg.data = recv_msg->msg_data;
recv_msg->msg.data_len = msg->rsp_size - 2;
deliver_local_response(intf, recv_msg);
return 0;
}
/*
* Handle a received message. Return 1 if the message should be requeued,
* 0 if the message should be freed, or -1 if the message should not
* be freed or requeued.
*/
static int handle_one_recv_msg(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
int requeue;
int chan;
pr_debug("Recv: %*ph\n", msg->rsp_size, msg->rsp);
if ((msg->data_size >= 2)
&& (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2))
&& (msg->data[1] == IPMI_SEND_MSG_CMD)
&& (msg->user_data == NULL)) {
if (intf->in_shutdown)
goto free_msg;
/*
* This is the local response to a command send, start
* the timer for these. The user_data will not be
* NULL if this is a response send, and we will let
* response sends just go through.
*/
/*
* Check for errors, if we get certain errors (ones
* that mean basically we can try again later), we
* ignore them and start the timer. Otherwise we
* report the error immediately.
*/
if ((msg->rsp_size >= 3) && (msg->rsp[2] != 0)
&& (msg->rsp[2] != IPMI_NODE_BUSY_ERR)
&& (msg->rsp[2] != IPMI_LOST_ARBITRATION_ERR)
&& (msg->rsp[2] != IPMI_BUS_ERR)
&& (msg->rsp[2] != IPMI_NAK_ON_WRITE_ERR)) {
int ch = msg->rsp[3] & 0xf;
struct ipmi_channel *chans;
/* Got an error sending the message, handle it. */
chans = READ_ONCE(intf->channel_list)->c;
if ((chans[ch].medium == IPMI_CHANNEL_MEDIUM_8023LAN)
|| (chans[ch].medium == IPMI_CHANNEL_MEDIUM_ASYNC))
ipmi_inc_stat(intf, sent_lan_command_errs);
else
ipmi_inc_stat(intf, sent_ipmb_command_errs);
intf_err_seq(intf, msg->msgid, msg->rsp[2]);
} else
/* The message was sent, start the timer. */
intf_start_seq_timer(intf, msg->msgid);
free_msg:
requeue = 0;
goto out;
} else if (msg->rsp_size < 2) {
/* Message is too small to be correct. */
dev_warn(intf->si_dev,
"BMC returned too small a message for netfn %x cmd %x, got %d bytes\n",
(msg->data[0] >> 2) | 1, msg->data[1], msg->rsp_size);
/* Generate an error response for the message. */
msg->rsp[0] = msg->data[0] | (1 << 2);
msg->rsp[1] = msg->data[1];
msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
msg->rsp_size = 3;
} else if (((msg->rsp[0] >> 2) != ((msg->data[0] >> 2) | 1))
|| (msg->rsp[1] != msg->data[1])) {
/*
* The NetFN and Command in the response is not even
* marginally correct.
*/
dev_warn(intf->si_dev,
"BMC returned incorrect response, expected netfn %x cmd %x, got netfn %x cmd %x\n",
(msg->data[0] >> 2) | 1, msg->data[1],
msg->rsp[0] >> 2, msg->rsp[1]);
/* Generate an error response for the message. */
msg->rsp[0] = msg->data[0] | (1 << 2);
msg->rsp[1] = msg->data[1];
msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
msg->rsp_size = 3;
}
if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
&& (msg->rsp[1] == IPMI_SEND_MSG_CMD)
&& (msg->user_data != NULL)) {
/*
* It's a response to a response we sent. For this we
* deliver a send message response to the user.
*/
struct ipmi_recv_msg *recv_msg = msg->user_data;
requeue = 0;
if (msg->rsp_size < 2)
/* Message is too small to be correct. */
goto out;
chan = msg->data[2] & 0x0f;
if (chan >= IPMI_MAX_CHANNELS)
/* Invalid channel number */
goto out;
if (!recv_msg)
goto out;
recv_msg->recv_type = IPMI_RESPONSE_RESPONSE_TYPE;
recv_msg->msg.data = recv_msg->msg_data;
recv_msg->msg.data_len = 1;
recv_msg->msg_data[0] = msg->rsp[2];
deliver_local_response(intf, recv_msg);
} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
&& (msg->rsp[1] == IPMI_GET_MSG_CMD)) {
struct ipmi_channel *chans;
/* It's from the receive queue. */
chan = msg->rsp[3] & 0xf;
if (chan >= IPMI_MAX_CHANNELS) {
/* Invalid channel number */
requeue = 0;
goto out;
}
/*
* We need to make sure the channels have been initialized.
* The channel_handler routine will set the "curr_channel"
* equal to or greater than IPMI_MAX_CHANNELS when all the
* channels for this interface have been initialized.
*/
if (!intf->channels_ready) {
requeue = 0; /* Throw the message away */
goto out;
}
chans = READ_ONCE(intf->channel_list)->c;
switch (chans[chan].medium) {
case IPMI_CHANNEL_MEDIUM_IPMB:
if (msg->rsp[4] & 0x04) {
/*
* It's a response, so find the
* requesting message and send it up.
*/
requeue = handle_ipmb_get_msg_rsp(intf, msg);
} else {
/*
* It's a command to the SMS from some other
* entity. Handle that.
*/
requeue = handle_ipmb_get_msg_cmd(intf, msg);
}
break;
case IPMI_CHANNEL_MEDIUM_8023LAN:
case IPMI_CHANNEL_MEDIUM_ASYNC:
if (msg->rsp[6] & 0x04) {
/*
* It's a response, so find the
* requesting message and send it up.
*/
requeue = handle_lan_get_msg_rsp(intf, msg);
} else {
/*
* It's a command to the SMS from some other
* entity. Handle that.
*/
requeue = handle_lan_get_msg_cmd(intf, msg);
}
break;
default:
/* Check for OEM Channels. Clients had better
register for these commands. */
if ((chans[chan].medium >= IPMI_CHANNEL_MEDIUM_OEM_MIN)
&& (chans[chan].medium
<= IPMI_CHANNEL_MEDIUM_OEM_MAX)) {
requeue = handle_oem_get_msg_cmd(intf, msg);
} else {
/*
* We don't handle the channel type, so just
* free the message.
*/
requeue = 0;
}
}
} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
&& (msg->rsp[1] == IPMI_READ_EVENT_MSG_BUFFER_CMD)) {
/* It's an asynchronous event. */
requeue = handle_read_event_rsp(intf, msg);
} else {
/* It's a response from the local BMC. */
requeue = handle_bmc_rsp(intf, msg);
}
out:
return requeue;
}
/*
* If there are messages in the queue or pretimeouts, handle them.
*/
static void handle_new_recv_msgs(struct ipmi_smi *intf)
{
struct ipmi_smi_msg *smi_msg;
unsigned long flags = 0;
int rv;
int run_to_completion = intf->run_to_completion;
/* See if any waiting messages need to be processed. */
if (!run_to_completion)
spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
while (!list_empty(&intf->waiting_rcv_msgs)) {
smi_msg = list_entry(intf->waiting_rcv_msgs.next,
struct ipmi_smi_msg, link);
list_del(&smi_msg->link);
if (!run_to_completion)
spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock,
flags);
rv = handle_one_recv_msg(intf, smi_msg);
if (!run_to_completion)
spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
if (rv > 0) {
/*
* To preserve message order, quit if we
* can't handle a message. Add the message
* back at the head, this is safe because this
* tasklet is the only thing that pulls the
* messages.
*/
list_add(&smi_msg->link, &intf->waiting_rcv_msgs);
break;
} else {
if (rv == 0)
/* Message handled */
ipmi_free_smi_msg(smi_msg);
/* If rv < 0, fatal error, del but don't free. */
}
}
if (!run_to_completion)
spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock, flags);
/*
* If the pretimout count is non-zero, decrement one from it and
* deliver pretimeouts to all the users.
*/
if (atomic_add_unless(&intf->watchdog_pretimeouts_to_deliver, -1, 0)) {
struct ipmi_user *user;
int index;
index = srcu_read_lock(&intf->users_srcu);
list_for_each_entry_rcu(user, &intf->users, link) {
if (user->handler->ipmi_watchdog_pretimeout)
user->handler->ipmi_watchdog_pretimeout(
user->handler_data);
}
srcu_read_unlock(&intf->users_srcu, index);
}
}
static void smi_recv_tasklet(struct tasklet_struct *t)
{
unsigned long flags = 0; /* keep us warning-free. */
struct ipmi_smi *intf = from_tasklet(intf, t, recv_tasklet);
int run_to_completion = intf->run_to_completion;
struct ipmi_smi_msg *newmsg = NULL;
/*
* Start the next message if available.
*
* Do this here, not in the actual receiver, because we may deadlock
* because the lower layer is allowed to hold locks while calling
* message delivery.
*/
rcu_read_lock();
if (!run_to_completion)
spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
if (intf->curr_msg == NULL && !intf->in_shutdown) {
struct list_head *entry = NULL;
/* Pick the high priority queue first. */
if (!list_empty(&intf->hp_xmit_msgs))
entry = intf->hp_xmit_msgs.next;
else if (!list_empty(&intf->xmit_msgs))
entry = intf->xmit_msgs.next;
if (entry) {
list_del(entry);
newmsg = list_entry(entry, struct ipmi_smi_msg, link);
intf->curr_msg = newmsg;
}
}
if (!run_to_completion)
spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
if (newmsg)
intf->handlers->sender(intf->send_info, newmsg);
rcu_read_unlock();
handle_new_recv_msgs(intf);
}
/* Handle a new message from the lower layer. */
void ipmi_smi_msg_received(struct ipmi_smi *intf,
struct ipmi_smi_msg *msg)
{
unsigned long flags = 0; /* keep us warning-free. */
int run_to_completion = intf->run_to_completion;
/*
* To preserve message order, we keep a queue and deliver from
* a tasklet.
*/
if (!run_to_completion)
spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
list_add_tail(&msg->link, &intf->waiting_rcv_msgs);
if (!run_to_completion)
spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock,
flags);
if (!run_to_completion)
spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
/*
* We can get an asynchronous event or receive message in addition
* to commands we send.
*/
if (msg == intf->curr_msg)
intf->curr_msg = NULL;
if (!run_to_completion)
spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
if (run_to_completion)
smi_recv_tasklet(&intf->recv_tasklet);
else
tasklet_schedule(&intf->recv_tasklet);
}
EXPORT_SYMBOL(ipmi_smi_msg_received);
void ipmi_smi_watchdog_pretimeout(struct ipmi_smi *intf)
{
if (intf->in_shutdown)
return;
atomic_set(&intf->watchdog_pretimeouts_to_deliver, 1);
tasklet_schedule(&intf->recv_tasklet);
}
EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout);
static struct ipmi_smi_msg *
smi_from_recv_msg(struct ipmi_smi *intf, struct ipmi_recv_msg *recv_msg,
unsigned char seq, long seqid)
{
struct ipmi_smi_msg *smi_msg = ipmi_alloc_smi_msg();
if (!smi_msg)
/*
* If we can't allocate the message, then just return, we
* get 4 retries, so this should be ok.
*/
return NULL;
memcpy(smi_msg->data, recv_msg->msg.data, recv_msg->msg.data_len);
smi_msg->data_size = recv_msg->msg.data_len;
smi_msg->msgid = STORE_SEQ_IN_MSGID(seq, seqid);
pr_debug("Resend: %*ph\n", smi_msg->data_size, smi_msg->data);
return smi_msg;
}
static void check_msg_timeout(struct ipmi_smi *intf, struct seq_table *ent,
struct list_head *timeouts,
unsigned long timeout_period,
int slot, unsigned long *flags,
bool *need_timer)
{
struct ipmi_recv_msg *msg;
if (intf->in_shutdown)
return;
if (!ent->inuse)
return;
if (timeout_period < ent->timeout) {
ent->timeout -= timeout_period;
*need_timer = true;
return;
}
if (ent->retries_left == 0) {
/* The message has used all its retries. */
ent->inuse = 0;
smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES);
msg = ent->recv_msg;
list_add_tail(&msg->link, timeouts);
if (ent->broadcast)
ipmi_inc_stat(intf, timed_out_ipmb_broadcasts);
else if (is_lan_addr(&ent->recv_msg->addr))
ipmi_inc_stat(intf, timed_out_lan_commands);
else
ipmi_inc_stat(intf, timed_out_ipmb_commands);
} else {
struct ipmi_smi_msg *smi_msg;
/* More retries, send again. */
*need_timer = true;
/*
* Start with the max timer, set to normal timer after
* the message is sent.
*/
ent->timeout = MAX_MSG_TIMEOUT;
ent->retries_left--;
smi_msg = smi_from_recv_msg(intf, ent->recv_msg, slot,
ent->seqid);
if (!smi_msg) {
if (is_lan_addr(&ent->recv_msg->addr))
ipmi_inc_stat(intf,
dropped_rexmit_lan_commands);
else
ipmi_inc_stat(intf,
dropped_rexmit_ipmb_commands);
return;
}
spin_unlock_irqrestore(&intf->seq_lock, *flags);
/*
* Send the new message. We send with a zero
* priority. It timed out, I doubt time is that
* critical now, and high priority messages are really
* only for messages to the local MC, which don't get
* resent.
*/
if (intf->handlers) {
if (is_lan_addr(&ent->recv_msg->addr))
ipmi_inc_stat(intf,
retransmitted_lan_commands);
else
ipmi_inc_stat(intf,
retransmitted_ipmb_commands);
smi_send(intf, intf->handlers, smi_msg, 0);
} else
ipmi_free_smi_msg(smi_msg);
spin_lock_irqsave(&intf->seq_lock, *flags);
}
}
static bool ipmi_timeout_handler(struct ipmi_smi *intf,
unsigned long timeout_period)
{
struct list_head timeouts;
struct ipmi_recv_msg *msg, *msg2;
unsigned long flags;
int i;
bool need_timer = false;
if (!intf->bmc_registered) {
kref_get(&intf->refcount);
if (!schedule_work(&intf->bmc_reg_work)) {
kref_put(&intf->refcount, intf_free);
need_timer = true;
}
}
/*
* Go through the seq table and find any messages that
* have timed out, putting them in the timeouts
* list.
*/
INIT_LIST_HEAD(&timeouts);
spin_lock_irqsave(&intf->seq_lock, flags);
if (intf->ipmb_maintenance_mode_timeout) {
if (intf->ipmb_maintenance_mode_timeout <= timeout_period)
intf->ipmb_maintenance_mode_timeout = 0;
else
intf->ipmb_maintenance_mode_timeout -= timeout_period;
}
for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
check_msg_timeout(intf, &intf->seq_table[i],
&timeouts, timeout_period, i,
&flags, &need_timer);
spin_unlock_irqrestore(&intf->seq_lock, flags);
list_for_each_entry_safe(msg, msg2, &timeouts, link)
deliver_err_response(intf, msg, IPMI_TIMEOUT_COMPLETION_CODE);
/*
* Maintenance mode handling. Check the timeout
* optimistically before we claim the lock. It may
* mean a timeout gets missed occasionally, but that
* only means the timeout gets extended by one period
* in that case. No big deal, and it avoids the lock
* most of the time.
*/
if (intf->auto_maintenance_timeout > 0) {
spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
if (intf->auto_maintenance_timeout > 0) {
intf->auto_maintenance_timeout
-= timeout_period;
if (!intf->maintenance_mode
&& (intf->auto_maintenance_timeout <= 0)) {
intf->maintenance_mode_enable = false;
maintenance_mode_update(intf);
}
}
spin_unlock_irqrestore(&intf->maintenance_mode_lock,
flags);
}
tasklet_schedule(&intf->recv_tasklet);
return need_timer;
}
static void ipmi_request_event(struct ipmi_smi *intf)
{
/* No event requests when in maintenance mode. */
if (intf->maintenance_mode_enable)
return;
if (!intf->in_shutdown)
intf->handlers->request_events(intf->send_info);
}
static struct timer_list ipmi_timer;
static atomic_t stop_operation;
static void ipmi_timeout(struct timer_list *unused)
{
struct ipmi_smi *intf;
bool need_timer = false;
int index;
if (atomic_read(&stop_operation))
return;
index = srcu_read_lock(&ipmi_interfaces_srcu);
list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
if (atomic_read(&intf->event_waiters)) {
intf->ticks_to_req_ev--;
if (intf->ticks_to_req_ev == 0) {
ipmi_request_event(intf);
intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
}
need_timer = true;
}
need_timer |= ipmi_timeout_handler(intf, IPMI_TIMEOUT_TIME);
}
srcu_read_unlock(&ipmi_interfaces_srcu, index);
if (need_timer)
mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
}
static void need_waiter(struct ipmi_smi *intf)
{
/* Racy, but worst case we start the timer twice. */
if (!timer_pending(&ipmi_timer))
mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
}
static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0);
static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0);
static void free_smi_msg(struct ipmi_smi_msg *msg)
{
atomic_dec(&smi_msg_inuse_count);
kfree(msg);
}
struct ipmi_smi_msg *ipmi_alloc_smi_msg(void)
{
struct ipmi_smi_msg *rv;
rv = kmalloc(sizeof(struct ipmi_smi_msg), GFP_ATOMIC);
if (rv) {
rv->done = free_smi_msg;
rv->user_data = NULL;
atomic_inc(&smi_msg_inuse_count);
}
return rv;
}
EXPORT_SYMBOL(ipmi_alloc_smi_msg);
static void free_recv_msg(struct ipmi_recv_msg *msg)
{
atomic_dec(&recv_msg_inuse_count);
kfree(msg);
}
static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void)
{
struct ipmi_recv_msg *rv;
rv = kmalloc(sizeof(struct ipmi_recv_msg), GFP_ATOMIC);
if (rv) {
rv->user = NULL;
rv->done = free_recv_msg;
atomic_inc(&recv_msg_inuse_count);
}
return rv;
}
void ipmi_free_recv_msg(struct ipmi_recv_msg *msg)
{
if (msg->user)
kref_put(&msg->user->refcount, free_user);
msg->done(msg);
}
EXPORT_SYMBOL(ipmi_free_recv_msg);
static atomic_t panic_done_count = ATOMIC_INIT(0);
static void dummy_smi_done_handler(struct ipmi_smi_msg *msg)
{
atomic_dec(&panic_done_count);
}
static void dummy_recv_done_handler(struct ipmi_recv_msg *msg)
{
atomic_dec(&panic_done_count);
}
/*
* Inside a panic, send a message and wait for a response.
*/
static void ipmi_panic_request_and_wait(struct ipmi_smi *intf,
struct ipmi_addr *addr,
struct kernel_ipmi_msg *msg)
{
struct ipmi_smi_msg smi_msg;
struct ipmi_recv_msg recv_msg;
int rv;
smi_msg.done = dummy_smi_done_handler;
recv_msg.done = dummy_recv_done_handler;
atomic_add(2, &panic_done_count);
rv = i_ipmi_request(NULL,
intf,
addr,
0,
msg,
intf,
&smi_msg,
&recv_msg,
0,
intf->addrinfo[0].address,
intf->addrinfo[0].lun,
0, 1); /* Don't retry, and don't wait. */
if (rv)
atomic_sub(2, &panic_done_count);
else if (intf->handlers->flush_messages)
intf->handlers->flush_messages(intf->send_info);
while (atomic_read(&panic_done_count) != 0)
ipmi_poll(intf);
}
static void event_receiver_fetcher(struct ipmi_smi *intf,
struct ipmi_recv_msg *msg)
{
if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
&& (msg->msg.netfn == IPMI_NETFN_SENSOR_EVENT_RESPONSE)
&& (msg->msg.cmd == IPMI_GET_EVENT_RECEIVER_CMD)
&& (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
/* A get event receiver command, save it. */
intf->event_receiver = msg->msg.data[1];
intf->event_receiver_lun = msg->msg.data[2] & 0x3;
}
}
static void device_id_fetcher(struct ipmi_smi *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_ID_CMD)
&& (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
/*
* A get device id command, save if we are an event
* receiver or generator.
*/
intf->local_sel_device = (msg->msg.data[6] >> 2) & 1;
intf->local_event_generator = (msg->msg.data[6] >> 5) & 1;
}
}
static void send_panic_events(struct ipmi_smi *intf, char *str)
{
struct kernel_ipmi_msg msg;
unsigned char data[16];
struct ipmi_system_interface_addr *si;
struct ipmi_addr addr;
char *p = str;
struct ipmi_ipmb_addr *ipmb;
int j;
if (ipmi_send_panic_event == IPMI_SEND_PANIC_EVENT_NONE)
return;
si = (struct ipmi_system_interface_addr *) &addr;
si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
si->channel = IPMI_BMC_CHANNEL;
si->lun = 0;
/* Fill in an event telling that we have failed. */
msg.netfn = 0x04; /* Sensor or Event. */
msg.cmd = 2; /* Platform event command. */
msg.data = data;
msg.data_len = 8;
data[0] = 0x41; /* Kernel generator ID, IPMI table 5-4 */
data[1] = 0x03; /* This is for IPMI 1.0. */
data[2] = 0x20; /* OS Critical Stop, IPMI table 36-3 */
data[4] = 0x6f; /* Sensor specific, IPMI table 36-1 */
data[5] = 0xa1; /* Runtime stop OEM bytes 2 & 3. */
/*
* Put a few breadcrumbs in. Hopefully later we can add more things
* to make the panic events more useful.
*/
if (str) {
data[3] = str[0];
data[6] = str[1];
data[7] = str[2];
}
/* Send the event announcing the panic. */
ipmi_panic_request_and_wait(intf, &addr, &msg);
/*
* On every interface, dump a bunch of OEM event holding the
* string.
*/
if (ipmi_send_panic_event != IPMI_SEND_PANIC_EVENT_STRING || !str)
return;
/*
* intf_num is used as an marker to tell if the
* interface is valid. Thus we need a read barrier to
* make sure data fetched before checking intf_num
* won't be used.
*/
smp_rmb();
/*
* First job here is to figure out where to send the
* OEM events. There's no way in IPMI to send OEM
* events using an event send command, so we have to
* find the SEL to put them in and stick them in
* there.
*/
/* Get capabilities from the get device id. */
intf->local_sel_device = 0;
intf->local_event_generator = 0;
intf->event_receiver = 0;
/* Request the device info from the local MC. */
msg.netfn = IPMI_NETFN_APP_REQUEST;
msg.cmd = IPMI_GET_DEVICE_ID_CMD;
msg.data = NULL;
msg.data_len = 0;
intf->null_user_handler = device_id_fetcher;
ipmi_panic_request_and_wait(intf, &addr, &msg);
if (intf->local_event_generator) {
/* Request the event receiver from the local MC. */
msg.netfn = IPMI_NETFN_SENSOR_EVENT_REQUEST;
msg.cmd = IPMI_GET_EVENT_RECEIVER_CMD;
msg.data = NULL;
msg.data_len = 0;
intf->null_user_handler = event_receiver_fetcher;
ipmi_panic_request_and_wait(intf, &addr, &msg);
}
intf->null_user_handler = NULL;
/*
* Validate the event receiver. The low bit must not
* be 1 (it must be a valid IPMB address), it cannot
* be zero, and it must not be my address.
*/
if (((intf->event_receiver & 1) == 0)
&& (intf->event_receiver != 0)
&& (intf->event_receiver != intf->addrinfo[0].address)) {
/*
* The event receiver is valid, send an IPMB
* message.
*/
ipmb = (struct ipmi_ipmb_addr *) &addr;
ipmb->addr_type = IPMI_IPMB_ADDR_TYPE;
ipmb->channel = 0; /* FIXME - is this right? */
ipmb->lun = intf->event_receiver_lun;
ipmb->slave_addr = intf->event_receiver;
} else if (intf->local_sel_device) {
/*
* The event receiver was not valid (or was
* me), but I am an SEL device, just dump it
* in my SEL.
*/
si = (struct ipmi_system_interface_addr *) &addr;
si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
si->channel = IPMI_BMC_CHANNEL;
si->lun = 0;
} else
return; /* No where to send the event. */
msg.netfn = IPMI_NETFN_STORAGE_REQUEST; /* Storage. */
msg.cmd = IPMI_ADD_SEL_ENTRY_CMD;
msg.data = data;
msg.data_len = 16;
j = 0;
while (*p) {
int size = strlen(p);
if (size > 11)
size = 11;
data[0] = 0;
data[1] = 0;
data[2] = 0xf0; /* OEM event without timestamp. */
data[3] = intf->addrinfo[0].address;
data[4] = j++; /* sequence # */
/*
* Always give 11 bytes, so strncpy will fill
* it with zeroes for me.
*/
strncpy(data+5, p, 11);
p += size;
ipmi_panic_request_and_wait(intf, &addr, &msg);
}
}
static int has_panicked;
static int panic_event(struct notifier_block *this,
unsigned long event,
void *ptr)
{
struct ipmi_smi *intf;
struct ipmi_user *user;
if (has_panicked)
return NOTIFY_DONE;
has_panicked = 1;
/* For every registered interface, set it to run to completion. */
list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
if (!intf->handlers || intf->intf_num == -1)
/* Interface is not ready. */
continue;
if (!intf->handlers->poll)
continue;
/*
* If we were interrupted while locking xmit_msgs_lock or
* waiting_rcv_msgs_lock, the corresponding list may be
* corrupted. In this case, drop items on the list for
* the safety.
*/
if (!spin_trylock(&intf->xmit_msgs_lock)) {
INIT_LIST_HEAD(&intf->xmit_msgs);
INIT_LIST_HEAD(&intf->hp_xmit_msgs);
} else
spin_unlock(&intf->xmit_msgs_lock);
if (!spin_trylock(&intf->waiting_rcv_msgs_lock))
INIT_LIST_HEAD(&intf->waiting_rcv_msgs);
else
spin_unlock(&intf->waiting_rcv_msgs_lock);
intf->run_to_completion = 1;
if (intf->handlers->set_run_to_completion)
intf->handlers->set_run_to_completion(intf->send_info,
1);
list_for_each_entry_rcu(user, &intf->users, link) {
if (user->handler->ipmi_panic_handler)
user->handler->ipmi_panic_handler(
user->handler_data);
}
send_panic_events(intf, ptr);
}
return NOTIFY_DONE;
}
/* Must be called with ipmi_interfaces_mutex held. */
static int ipmi_register_driver(void)
{
int rv;
if (drvregistered)
return 0;
rv = driver_register(&ipmidriver.driver);
if (rv)
pr_err("Could not register IPMI driver\n");
else
drvregistered = true;
return rv;
}
static struct notifier_block panic_block = {
.notifier_call = panic_event,
.next = NULL,
.priority = 200 /* priority: INT_MAX >= x >= 0 */
};
static int ipmi_init_msghandler(void)
{
int rv;
mutex_lock(&ipmi_interfaces_mutex);
rv = ipmi_register_driver();
if (rv)
goto out;
if (initialized)
goto out;
init_srcu_struct(&ipmi_interfaces_srcu);
timer_setup(&ipmi_timer, ipmi_timeout, 0);
mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
initialized = true;
out:
mutex_unlock(&ipmi_interfaces_mutex);
return rv;
}
static int __init ipmi_init_msghandler_mod(void)
{
int rv;
pr_info("version " IPMI_DRIVER_VERSION "\n");
mutex_lock(&ipmi_interfaces_mutex);
rv = ipmi_register_driver();
mutex_unlock(&ipmi_interfaces_mutex);
return rv;
}
static void __exit cleanup_ipmi(void)
{
int count;
if (initialized) {
atomic_notifier_chain_unregister(&panic_notifier_list,
&panic_block);
/*
* This can't be called if any interfaces exist, so no worry
* about shutting down the interfaces.
*/
/*
* Tell the timer to stop, then wait for it to stop. This
* avoids problems with race conditions removing the timer
* here.
*/
atomic_set(&stop_operation, 1);
del_timer_sync(&ipmi_timer);
initialized = false;
/* Check for buffer leaks. */
count = atomic_read(&smi_msg_inuse_count);
if (count != 0)
pr_warn("SMI message count %d at exit\n", count);
count = atomic_read(&recv_msg_inuse_count);
if (count != 0)
pr_warn("recv message count %d at exit\n", count);
cleanup_srcu_struct(&ipmi_interfaces_srcu);
}
if (drvregistered)
driver_unregister(&ipmidriver.driver);
}
module_exit(cleanup_ipmi);
module_init(ipmi_init_msghandler_mod);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
MODULE_DESCRIPTION("Incoming and outgoing message routing for an IPMI"
" interface.");
MODULE_VERSION(IPMI_DRIVER_VERSION);
MODULE_SOFTDEP("post: ipmi_devintf");
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