ipmi_msghandler.c 118.2 KB
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/*
 * ipmi_msghandler.c
 *
 * Incoming and outgoing message routing for an IPMI interface.
 *
 * Author: MontaVista Software, Inc.
 *         Corey Minyard <minyard@mvista.com>
 *         source@mvista.com
 *
 * Copyright 2002 MontaVista Software Inc.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#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>
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#include <linux/rcupdate.h>
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#include <linux/interrupt.h>
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#define PFX "IPMI message handler: "
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#define IPMI_DRIVER_VERSION "39.2"
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static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void);
static int ipmi_init_msghandler(void);
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static void smi_recv_tasklet(unsigned long);
static void handle_new_recv_msgs(ipmi_smi_t intf);
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static void need_waiter(ipmi_smi_t intf);
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static int handle_one_recv_msg(ipmi_smi_t          intf,
			       struct ipmi_smi_msg *msg);
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static int initialized;
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#ifdef CONFIG_PROC_FS
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static struct proc_dir_entry *proc_ipmi_root;
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#endif /* CONFIG_PROC_FS */
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/* Remain in auto-maintenance mode for this amount of time (in ms). */
#define IPMI_MAINTENANCE_MODE_TIMEOUT 30000

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#define MAX_EVENTS_IN_QUEUE	25

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/*
 * Don't let a message sit in a queue forever, always time it with at lest
 * the max message timer.  This is in milliseconds.
 */
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#define MAX_MSG_TIMEOUT		60000

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/* 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))

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/*
 * The main "user" data structure.
 */
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struct ipmi_user {
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	struct list_head link;

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	/* Set to false when the user is destroyed. */
	bool valid;
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	struct kref refcount;

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	/* The upper layer that handles receive messages. */
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	const struct ipmi_user_hndl *handler;
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	void             *handler_data;

	/* The interface this user is bound to. */
	ipmi_smi_t intf;

	/* Does this interface receive IPMI events? */
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	bool gets_events;
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};

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struct cmd_rcvr {
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	struct list_head link;

	ipmi_user_t   user;
	unsigned char netfn;
	unsigned char cmd;
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	unsigned int  chans;
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	/*
	 * 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
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	 * every individual deletion of a command.
	 */
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	struct cmd_rcvr *next;
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};

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struct seq_table {
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	unsigned int         inuse : 1;
	unsigned int         broadcast : 1;

	unsigned long        timeout;
	unsigned long        orig_timeout;
	unsigned int         retries_left;

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	/*
	 * 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.
	 */
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	long                 seqid;

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	/*
	 * 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.
	 */
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	struct ipmi_recv_msg *recv_msg;
};

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/*
 * Store the information in a msgid (long) to allow us to find a
 * sequence table entry from the msgid.
 */
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#define STORE_SEQ_IN_MSGID(seq, seqid) \
	((((seq) & 0x3f) << 26) | ((seqid) & 0x3ffffff))
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#define GET_SEQ_FROM_MSGID(msgid, seq, seqid) \
	do {								\
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		seq = (((msgid) >> 26) & 0x3f);				\
		seqid = ((msgid) & 0x3ffffff);				\
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	} while (0)
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#define NEXT_SEQID(seqid) (((seqid) + 1) & 0x3ffffff)
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struct ipmi_channel {
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	unsigned char medium;
	unsigned char protocol;
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	/*
	 * My slave address.  This is initialized to IPMI_BMC_SLAVE_ADDR,
	 * but may be changed by the user.
	 */
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	unsigned char address;

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	/*
	 * My LUN.  This should generally stay the SMS LUN, but just in
	 * case...
	 */
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	unsigned char lun;
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};

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#ifdef CONFIG_PROC_FS
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struct ipmi_proc_entry {
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	char                   *name;
	struct ipmi_proc_entry *next;
};
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#endif
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struct bmc_device {
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	struct platform_device pdev;
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	struct ipmi_device_id  id;
	unsigned char          guid[16];
	int                    guid_set;
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	char                   name[16];
	struct kref	       usecount;
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};
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#define to_bmc_device(x) container_of((x), struct bmc_device, pdev.dev)
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/*
 * Various statistics for IPMI, these index stats[] in the ipmi_smi
 * structure.
 */
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enum ipmi_stat_indexes {
	/* Commands we got from the user that were invalid. */
	IPMI_STAT_sent_invalid_commands = 0,
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	/* Commands we sent to the MC. */
	IPMI_STAT_sent_local_commands,
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	/* Responses from the MC that were delivered to a user. */
	IPMI_STAT_handled_local_responses,
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	/* Responses from the MC that were not delivered to a user. */
	IPMI_STAT_unhandled_local_responses,
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	/* Commands we sent out to the IPMB bus. */
	IPMI_STAT_sent_ipmb_commands,
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	/* Commands sent on the IPMB that had errors on the SEND CMD */
	IPMI_STAT_sent_ipmb_command_errs,
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	/* Each retransmit increments this count. */
	IPMI_STAT_retransmitted_ipmb_commands,
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	/*
	 * When a message times out (runs out of retransmits) this is
	 * incremented.
	 */
	IPMI_STAT_timed_out_ipmb_commands,
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	/*
	 * 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,
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	/* Responses I have sent to the IPMB bus. */
	IPMI_STAT_sent_ipmb_responses,
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	/* The response was delivered to the user. */
	IPMI_STAT_handled_ipmb_responses,
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	/* The response had invalid data in it. */
	IPMI_STAT_invalid_ipmb_responses,
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	/* The response didn't have anyone waiting for it. */
	IPMI_STAT_unhandled_ipmb_responses,
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	/* Commands we sent out to the IPMB bus. */
	IPMI_STAT_sent_lan_commands,
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	/* Commands sent on the IPMB that had errors on the SEND CMD */
	IPMI_STAT_sent_lan_command_errs,
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	/* Each retransmit increments this count. */
	IPMI_STAT_retransmitted_lan_commands,
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	/*
	 * 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,
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	/* The response was delivered to the user. */
	IPMI_STAT_handled_lan_responses,
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	/* The response had invalid data in it. */
	IPMI_STAT_invalid_lan_responses,
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	/* The response didn't have anyone waiting for it. */
	IPMI_STAT_unhandled_lan_responses,
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	/* The command was delivered to the user. */
	IPMI_STAT_handled_commands,
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	/* The command had invalid data in it. */
	IPMI_STAT_invalid_commands,
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	/* The command didn't have anyone waiting for it. */
	IPMI_STAT_unhandled_commands,
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	/* Invalid data in an event. */
	IPMI_STAT_invalid_events,
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	/* Events that were received with the proper format. */
	IPMI_STAT_events,
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	/* Retransmissions on IPMB that failed. */
	IPMI_STAT_dropped_rexmit_ipmb_commands,

	/* Retransmissions on LAN that failed. */
	IPMI_STAT_dropped_rexmit_lan_commands,
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	/* This *must* remain last, add new values above this. */
	IPMI_NUM_STATS
};
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#define IPMI_IPMB_NUM_SEQ	64
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#define IPMI_MAX_CHANNELS       16
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struct ipmi_smi {
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	/* What interface number are we? */
	int intf_num;

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	struct kref refcount;

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	/* Set when the interface is being unregistered. */
	bool in_shutdown;

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	/* Used for a list of interfaces. */
	struct list_head link;

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	/*
	 * The list of upper layers that are using me.  seq_lock
	 * protects this.
	 */
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	struct list_head users;
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	/* Information to supply to users. */
	unsigned char ipmi_version_major;
	unsigned char ipmi_version_minor;

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	/* Used for wake ups at startup. */
	wait_queue_head_t waitq;

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	struct bmc_device *bmc;
	char *my_dev_name;
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	/*
	 * This is the lower-layer's sender routine.  Note that you
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	 * must either be holding the ipmi_interfaces_mutex or be in
	 * an umpreemptible region to use this.  You must fetch the
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	 * value into a local variable and make sure it is not NULL.
	 */
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	const struct ipmi_smi_handlers *handlers;
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	void                     *send_info;

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#ifdef CONFIG_PROC_FS
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	/* A list of proc entries for this interface. */
	struct mutex           proc_entry_lock;
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	struct ipmi_proc_entry *proc_entries;
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#endif
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	/* Driver-model device for the system interface. */
	struct device          *si_dev;

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	/*
	 * 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.
	 */
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	spinlock_t       seq_lock;
	struct seq_table seq_table[IPMI_IPMB_NUM_SEQ];
	int curr_seq;

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	/*
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	 * 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.
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	 */
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	spinlock_t       waiting_rcv_msgs_lock;
	struct list_head waiting_rcv_msgs;
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	atomic_t	 watchdog_pretimeouts_to_deliver;
	struct tasklet_struct recv_tasklet;
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	spinlock_t             xmit_msgs_lock;
	struct list_head       xmit_msgs;
	struct ipmi_smi_msg    *curr_msg;
	struct list_head       hp_xmit_msgs;

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	/*
	 * The list of command receivers that are registered for commands
	 * on this interface.
	 */
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	struct mutex     cmd_rcvrs_mutex;
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	struct list_head cmd_rcvrs;

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	/*
	 * Events that were queues because no one was there to receive
	 * them.
	 */
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	spinlock_t       events_lock; /* For dealing with event stuff. */
	struct list_head waiting_events;
	unsigned int     waiting_events_count; /* How many events in queue? */
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	char             delivering_events;
	char             event_msg_printed;
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	atomic_t         event_waiters;
	unsigned int     ticks_to_req_ev;
	int              last_needs_timer;
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	/*
	 * The event receiver for my BMC, only really used at panic
	 * shutdown as a place to store this.
	 */
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	unsigned char event_receiver;
	unsigned char event_receiver_lun;
	unsigned char local_sel_device;
	unsigned char local_event_generator;

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	/* For handling of maintenance mode. */
	int maintenance_mode;
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	bool maintenance_mode_enable;
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	int auto_maintenance_timeout;
	spinlock_t maintenance_mode_lock; /* Used in a timer... */

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	/*
	 * 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.
	 */
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	void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_recv_msg *msg);
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	/*
	 * When we are scanning the channels for an SMI, this will
	 * tell which channel we are scanning.
	 */
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	int curr_channel;

	/* Channel information */
	struct ipmi_channel channels[IPMI_MAX_CHANNELS];

	/* Proc FS stuff. */
	struct proc_dir_entry *proc_dir;
	char                  proc_dir_name[10];

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	atomic_t stats[IPMI_NUM_STATS];
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	/*
	 * 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;
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};
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#define to_si_intf_from_dev(device) container_of(device, struct ipmi_smi, dev)
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/**
 * The driver model view of the IPMI messaging driver.
 */
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static struct platform_driver ipmidriver = {
	.driver = {
		.name = "ipmi",
		.bus = &platform_bus_type
	}
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};
static DEFINE_MUTEX(ipmidriver_mutex);

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static LIST_HEAD(ipmi_interfaces);
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static DEFINE_MUTEX(ipmi_interfaces_mutex);
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/*
 * List of watchers that want to know when smi's are added and deleted.
 */
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static LIST_HEAD(smi_watchers);
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static DEFINE_MUTEX(smi_watchers_mutex);
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#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]))

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static const char * const addr_src_to_str[] = {
	"invalid", "hotmod", "hardcoded", "SPMI", "ACPI", "SMBIOS", "PCI",
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	"device-tree"
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};
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const char *ipmi_addr_src_to_str(enum ipmi_addr_src src)
{
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	if (src >= SI_LAST)
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		src = 0; /* Invalid */
	return addr_src_to_str[src];
}
EXPORT_SYMBOL(ipmi_addr_src_to_str);

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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;
}
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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);
	}
}

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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);
	}
}

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static void clean_up_interface_data(ipmi_smi_t intf)
{
	int              i;
	struct cmd_rcvr  *rcvr, *rcvr2;
	struct list_head list;

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	tasklet_kill(&intf->recv_tasklet);

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	free_smi_msg_list(&intf->waiting_rcv_msgs);
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	free_recv_msg_list(&intf->waiting_events);

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	/*
	 * Wholesale remove all the entries from the list in the
	 * interface and wait for RCU to know that none are in use.
	 */
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	mutex_lock(&intf->cmd_rcvrs_mutex);
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	INIT_LIST_HEAD(&list);
	list_splice_init_rcu(&intf->cmd_rcvrs, &list, synchronize_rcu);
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	mutex_unlock(&intf->cmd_rcvrs_mutex);
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	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)
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					&& (intf->seq_table[i].recv_msg))
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			ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
	}
}

static void intf_free(struct kref *ref)
{
	ipmi_smi_t intf = container_of(ref, struct ipmi_smi, refcount);

	clean_up_interface_data(intf);
	kfree(intf);
}

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struct watcher_entry {
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	int              intf_num;
	ipmi_smi_t       intf;
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	struct list_head link;
};

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int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher)
{
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	ipmi_smi_t intf;
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	LIST_HEAD(to_deliver);
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	struct watcher_entry *e, *e2;

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	mutex_lock(&smi_watchers_mutex);

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	mutex_lock(&ipmi_interfaces_mutex);

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	/* Build a list of things to deliver. */
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	list_for_each_entry(intf, &ipmi_interfaces, link) {
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		if (intf->intf_num == -1)
			continue;
		e = kmalloc(sizeof(*e), GFP_KERNEL);
		if (!e)
			goto out_err;
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		kref_get(&intf->refcount);
		e->intf = intf;
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		e->intf_num = intf->intf_num;
		list_add_tail(&e->link, &to_deliver);
	}
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	/* We will succeed, so add it to the list. */
	list_add(&watcher->link, &smi_watchers);
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	mutex_unlock(&ipmi_interfaces_mutex);

	list_for_each_entry_safe(e, e2, &to_deliver, link) {
		list_del(&e->link);
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		watcher->new_smi(e->intf_num, e->intf->si_dev);
		kref_put(&e->intf->refcount, intf_free);
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		kfree(e);
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	}
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	mutex_unlock(&smi_watchers_mutex);
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	return 0;
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 out_err:
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	mutex_unlock(&ipmi_interfaces_mutex);
	mutex_unlock(&smi_watchers_mutex);
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	list_for_each_entry_safe(e, e2, &to_deliver, link) {
		list_del(&e->link);
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		kref_put(&e->intf->refcount, intf_free);
613 614 615
		kfree(e);
	}
	return -ENOMEM;
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}
617
EXPORT_SYMBOL(ipmi_smi_watcher_register);
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int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher)
{
621
	mutex_lock(&smi_watchers_mutex);
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	list_del(&(watcher->link));
623
	mutex_unlock(&smi_watchers_mutex);
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	return 0;
}
626
EXPORT_SYMBOL(ipmi_smi_watcher_unregister);
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628 629 630
/*
 * Must be called with smi_watchers_mutex held.
 */
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static void
632
call_smi_watchers(int i, struct device *dev)
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{
	struct ipmi_smi_watcher *w;

	list_for_each_entry(w, &smi_watchers, link) {
		if (try_module_get(w->owner)) {
638
			w->new_smi(i, dev);
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			module_put(w->owner);
		}
	}
}

static int
ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2)
{
	if (addr1->addr_type != addr2->addr_type)
		return 0;

	if (addr1->channel != addr2->channel)
		return 0;

	if (addr1->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
		struct ipmi_system_interface_addr *smi_addr1
		    = (struct ipmi_system_interface_addr *) addr1;
		struct ipmi_system_interface_addr *smi_addr2
		    = (struct ipmi_system_interface_addr *) addr2;
		return (smi_addr1->lun == smi_addr2->lun);
	}

661
	if (is_ipmb_addr(addr1) || is_ipmb_bcast_addr(addr1)) {
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		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));
	}

671
	if (is_lan_addr(addr1)) {
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		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)
{
689
	if (len < sizeof(struct ipmi_system_interface_addr))
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		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)
699
	    || (addr->channel >= IPMI_MAX_CHANNELS)
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	    || (addr->channel < 0))
		return -EINVAL;

703
	if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
704
		if (len < sizeof(struct ipmi_ipmb_addr))
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			return -EINVAL;
		return 0;
	}

709
	if (is_lan_addr(addr)) {
710
		if (len < sizeof(struct ipmi_lan_addr))
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			return -EINVAL;
		return 0;
	}

	return -EINVAL;
}
717
EXPORT_SYMBOL(ipmi_validate_addr);
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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)
725
			|| (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
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		return sizeof(struct ipmi_ipmb_addr);

	if (addr_type == IPMI_LAN_ADDR_TYPE)
		return sizeof(struct ipmi_lan_addr);

	return 0;
}
733
EXPORT_SYMBOL(ipmi_addr_length);
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static void deliver_response(struct ipmi_recv_msg *msg)
{
737
	if (!msg->user) {
738 739 740 741 742
		ipmi_smi_t    intf = msg->user_msg_data;

		/* Special handling for NULL users. */
		if (intf->null_user_handler) {
			intf->null_user_handler(intf, msg);
743
			ipmi_inc_stat(intf, handled_local_responses);
744 745
		} else {
			/* No handler, so give up. */
746
			ipmi_inc_stat(intf, unhandled_local_responses);
747 748
		}
		ipmi_free_recv_msg(msg);
749 750 751 752 753 754 755
	} 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.
		 */

756 757
		ipmi_user_t user = msg->user;
		user->handler->ipmi_recv_hndl(msg, user->handler_data);
758
	}
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}

761 762 763 764 765 766 767 768 769 770 771
static void
deliver_err_response(struct ipmi_recv_msg *msg, int err)
{
	msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
	msg->msg_data[0] = err;
	msg->msg.netfn |= 1; /* Convert to a response. */
	msg->msg.data_len = 1;
	msg->msg.data = msg->msg_data;
	deliver_response(msg);
}

772 773 774 775 776
/*
 * 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.
 */
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static int intf_next_seq(ipmi_smi_t           intf,
			 struct ipmi_recv_msg *recv_msg,
			 unsigned long        timeout,
			 int                  retries,
			 int                  broadcast,
			 unsigned char        *seq,
			 long                 *seqid)
{
	int          rv = 0;
	unsigned int i;

788 789
	for (i = intf->curr_seq; (i+1)%IPMI_IPMB_NUM_SEQ != intf->curr_seq;
					i = (i+1)%IPMI_IPMB_NUM_SEQ) {
790
		if (!intf->seq_table[i].inuse)
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			break;
	}

794
	if (!intf->seq_table[i].inuse) {
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		intf->seq_table[i].recv_msg = recv_msg;

797 798 799 800
		/*
		 * Start with the maximum timeout, when the send response
		 * comes in we will start the real timer.
		 */
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		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;
810
		need_waiter(intf);
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811 812 813
	} else {
		rv = -EAGAIN;
	}
814

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	return rv;
}

818 819 820 821 822 823 824
/*
 * 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).
 */
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825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
static int intf_find_seq(ipmi_smi_t           intf,
			 unsigned char        seq,
			 short                channel,
			 unsigned char        cmd,
			 unsigned char        netfn,
			 struct ipmi_addr     *addr,
			 struct ipmi_recv_msg **recv_msg)
{
	int           rv = -ENODEV;
	unsigned long flags;

	if (seq >= IPMI_IPMB_NUM_SEQ)
		return -EINVAL;

	spin_lock_irqsave(&(intf->seq_lock), flags);
	if (intf->seq_table[seq].inuse) {
		struct ipmi_recv_msg *msg = intf->seq_table[seq].recv_msg;

843 844 845
		if ((msg->addr.channel == channel) && (msg->msg.cmd == cmd)
				&& (msg->msg.netfn == netfn)
				&& (ipmi_addr_equal(addr, &(msg->addr)))) {
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			*recv_msg = msg;
			intf->seq_table[seq].inuse = 0;
			rv = 0;
		}
	}
	spin_unlock_irqrestore(&(intf->seq_lock), flags);

	return rv;
}


/* Start the timer for a specific sequence table entry. */
static int intf_start_seq_timer(ipmi_smi_t intf,
				long       msgid)
{
	int           rv = -ENODEV;
	unsigned long flags;
	unsigned char seq;
	unsigned long seqid;


	GET_SEQ_FROM_MSGID(msgid, seq, seqid);

	spin_lock_irqsave(&(intf->seq_lock), flags);
870 871 872 873
	/*
	 * We do this verification because the user can be deleted
	 * while a message is outstanding.
	 */
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	if ((intf->seq_table[seq].inuse)
875
				&& (intf->seq_table[seq].seqid == seqid)) {
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		struct seq_table *ent = &(intf->seq_table[seq]);
		ent->timeout = ent->orig_timeout;
		rv = 0;
	}
	spin_unlock_irqrestore(&(intf->seq_lock), flags);

	return rv;
}

/* Got an error for the send message for a specific sequence number. */
static int intf_err_seq(ipmi_smi_t   intf,
			long         msgid,
			unsigned int err)
{
	int                  rv = -ENODEV;
	unsigned long        flags;
	unsigned char        seq;
	unsigned long        seqid;
	struct ipmi_recv_msg *msg = NULL;


	GET_SEQ_FROM_MSGID(msgid, seq, seqid);

	spin_lock_irqsave(&(intf->seq_lock), flags);
900 901 902 903
	/*
	 * We do this verification because the user can be deleted
	 * while a message is outstanding.
	 */
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	if ((intf->seq_table[seq].inuse)
905
				&& (intf->seq_table[seq].seqid == seqid)) {
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		struct seq_table *ent = &(intf->seq_table[seq]);

		ent->inuse = 0;
		msg = ent->recv_msg;
		rv = 0;
	}
	spin_unlock_irqrestore(&(intf->seq_lock), flags);

914 915
	if (msg)
		deliver_err_response(msg, err);
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916 917 918 919 920 921

	return rv;
}


int ipmi_create_user(unsigned int          if_num,
C
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		     const struct ipmi_user_hndl *handler,
L
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923 924 925 926 927 928 929 930
		     void                  *handler_data,
		     ipmi_user_t           *user)
{
	unsigned long flags;
	ipmi_user_t   new_user;
	int           rv = 0;
	ipmi_smi_t    intf;

931 932 933 934 935 936 937
	/*
	 * 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.
	 */
L
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938 939 940 941

	if (handler == NULL)
		return -EINVAL;

942 943 944 945
	/*
	 * Make sure the driver is actually initialized, this handles
	 * problems with initialization order.
	 */
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946 947 948 949 950
	if (!initialized) {
		rv = ipmi_init_msghandler();
		if (rv)
			return rv;

951 952 953 954
		/*
		 * The init code doesn't return an error if it was turned
		 * off, but it won't initialize.  Check that.
		 */
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955 956 957 958 959
		if (!initialized)
			return -ENODEV;
	}

	new_user = kmalloc(sizeof(*new_user), GFP_KERNEL);
960
	if (!new_user)
L
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961 962
		return -ENOMEM;

963
	mutex_lock(&ipmi_interfaces_mutex);
964 965 966
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		if (intf->intf_num == if_num)
			goto found;
L
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967
	}
968
	/* Not found, return an error */
969 970
	rv = -EINVAL;
	goto out_kfree;
L
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971

972
 found:
973 974
	/* Note that each existing user holds a refcount to the interface. */
	kref_get(&intf->refcount);
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975

976
	kref_init(&new_user->refcount);
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	new_user->handler = handler;
	new_user->handler_data = handler_data;
	new_user->intf = intf;
980
	new_user->gets_events = false;
L
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981 982 983

	if (!try_module_get(intf->handlers->owner)) {
		rv = -ENODEV;
984
		goto out_kref;
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985 986 987 988 989 990
	}

	if (intf->handlers->inc_usecount) {
		rv = intf->handlers->inc_usecount(intf->send_info);
		if (rv) {
			module_put(intf->handlers->owner);
991
			goto out_kref;
L
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992 993 994
		}
	}

995 996 997 998
	/*
	 * Hold the lock so intf->handlers is guaranteed to be good
	 * until now
	 */
999 1000
	mutex_unlock(&ipmi_interfaces_mutex);

C
Corey Minyard 已提交
1001
	new_user->valid = true;
1002 1003 1004
	spin_lock_irqsave(&intf->seq_lock, flags);
	list_add_rcu(&new_user->link, &intf->users);
	spin_unlock_irqrestore(&intf->seq_lock, flags);
1005 1006 1007 1008 1009
	if (handler->ipmi_watchdog_pretimeout) {
		/* User wants pretimeouts, so make sure to watch for them. */
		if (atomic_inc_return(&intf->event_waiters) == 1)
			need_waiter(intf);
	}
1010 1011
	*user = new_user;
	return 0;
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1012

1013
out_kref:
1014
	kref_put(&intf->refcount, intf_free);
1015
out_kfree:
1016
	mutex_unlock(&ipmi_interfaces_mutex);
1017
	kfree(new_user);
L
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1018 1019
	return rv;
}
1020
EXPORT_SYMBOL(ipmi_create_user);
L
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1021

1022 1023 1024 1025
int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data)
{
	int           rv = 0;
	ipmi_smi_t    intf;
1026
	const struct ipmi_smi_handlers *handlers;
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048

	mutex_lock(&ipmi_interfaces_mutex);
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		if (intf->intf_num == if_num)
			goto found;
	}
	/* Not found, return an error */
	rv = -EINVAL;
	mutex_unlock(&ipmi_interfaces_mutex);
	return rv;

found:
	handlers = intf->handlers;
	rv = -ENOSYS;
	if (handlers->get_smi_info)
		rv = handlers->get_smi_info(intf->send_info, data);
	mutex_unlock(&ipmi_interfaces_mutex);

	return rv;
}
EXPORT_SYMBOL(ipmi_get_smi_info);

1049 1050 1051 1052 1053 1054 1055
static void free_user(struct kref *ref)
{
	ipmi_user_t user = container_of(ref, struct ipmi_user, refcount);
	kfree(user);
}

int ipmi_destroy_user(ipmi_user_t user)
L
Linus Torvalds 已提交
1056
{
1057
	ipmi_smi_t       intf = user->intf;
L
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1058 1059
	int              i;
	unsigned long    flags;
1060 1061
	struct cmd_rcvr  *rcvr;
	struct cmd_rcvr  *rcvrs = NULL;
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1062

C
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1063
	user->valid = false;
L
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1064

1065 1066 1067 1068 1069 1070
	if (user->handler->ipmi_watchdog_pretimeout)
		atomic_dec(&intf->event_waiters);

	if (user->gets_events)
		atomic_dec(&intf->event_waiters);

1071 1072 1073
	/* Remove the user from the interface's sequence table. */
	spin_lock_irqsave(&intf->seq_lock, flags);
	list_del_rcu(&user->link);
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C
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1075
	for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
1076
		if (intf->seq_table[i].inuse
1077
		    && (intf->seq_table[i].recv_msg->user == user)) {
1078
			intf->seq_table[i].inuse = 0;
1079
			ipmi_free_recv_msg(intf->seq_table[i].recv_msg);
L
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		}
	}
1082 1083 1084 1085 1086 1087 1088 1089
	spin_unlock_irqrestore(&intf->seq_lock, flags);

	/*
	 * Remove the user from the command receiver's table.  First
	 * we build a list of everything (not using the standard link,
	 * since other things may be using it till we do
	 * synchronize_rcu()) then free everything in that list.
	 */
1090
	mutex_lock(&intf->cmd_rcvrs_mutex);
1091
	list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
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		if (rcvr->user == user) {
1093 1094 1095
			list_del_rcu(&rcvr->link);
			rcvr->next = rcvrs;
			rcvrs = rcvr;
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		}
	}
1098
	mutex_unlock(&intf->cmd_rcvrs_mutex);
1099 1100 1101 1102 1103 1104
	synchronize_rcu();
	while (rcvrs) {
		rcvr = rcvrs;
		rcvrs = rcvr->next;
		kfree(rcvr);
	}
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1106 1107 1108 1109 1110 1111 1112
	mutex_lock(&ipmi_interfaces_mutex);
	if (intf->handlers) {
		module_put(intf->handlers->owner);
		if (intf->handlers->dec_usecount)
			intf->handlers->dec_usecount(intf->send_info);
	}
	mutex_unlock(&ipmi_interfaces_mutex);
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1114
	kref_put(&intf->refcount, intf_free);
L
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1116
	kref_put(&user->refcount, free_user);
L
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1118
	return 0;
L
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1119
}
1120
EXPORT_SYMBOL(ipmi_destroy_user);
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void ipmi_get_version(ipmi_user_t   user,
		      unsigned char *major,
		      unsigned char *minor)
{
1126 1127
	*major = user->intf->ipmi_version_major;
	*minor = user->intf->ipmi_version_minor;
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}
1129
EXPORT_SYMBOL(ipmi_get_version);
L
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1131 1132 1133
int ipmi_set_my_address(ipmi_user_t   user,
			unsigned int  channel,
			unsigned char address)
L
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1134
{
1135 1136 1137 1138
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	user->intf->channels[channel].address = address;
	return 0;
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}
1140
EXPORT_SYMBOL(ipmi_set_my_address);
L
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1142 1143 1144
int ipmi_get_my_address(ipmi_user_t   user,
			unsigned int  channel,
			unsigned char *address)
L
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1145
{
1146 1147 1148 1149
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	*address = user->intf->channels[channel].address;
	return 0;
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}
1151
EXPORT_SYMBOL(ipmi_get_my_address);
L
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1153 1154 1155
int ipmi_set_my_LUN(ipmi_user_t   user,
		    unsigned int  channel,
		    unsigned char LUN)
L
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1156
{
1157 1158 1159 1160
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	user->intf->channels[channel].lun = LUN & 0x3;
	return 0;
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}
1162
EXPORT_SYMBOL(ipmi_set_my_LUN);
L
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1164 1165 1166
int ipmi_get_my_LUN(ipmi_user_t   user,
		    unsigned int  channel,
		    unsigned char *address)
L
Linus Torvalds 已提交
1167
{
1168 1169 1170 1171
	if (channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	*address = user->intf->channels[channel].lun;
	return 0;
L
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1172
}
1173
EXPORT_SYMBOL(ipmi_get_my_LUN);
L
Linus Torvalds 已提交
1174

C
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1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
int ipmi_get_maintenance_mode(ipmi_user_t user)
{
	int           mode;
	unsigned long flags;

	spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags);
	mode = user->intf->maintenance_mode;
	spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags);

	return mode;
}
EXPORT_SYMBOL(ipmi_get_maintenance_mode);

static void maintenance_mode_update(ipmi_smi_t intf)
{
	if (intf->handlers->set_maintenance_mode)
		intf->handlers->set_maintenance_mode(
			intf->send_info, intf->maintenance_mode_enable);
}

int ipmi_set_maintenance_mode(ipmi_user_t user, int mode)
{
	int           rv = 0;
	unsigned long flags;
	ipmi_smi_t    intf = user->intf;

	spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
	if (intf->maintenance_mode != mode) {
		switch (mode) {
		case IPMI_MAINTENANCE_MODE_AUTO:
			intf->maintenance_mode_enable
				= (intf->auto_maintenance_timeout > 0);
			break;

		case IPMI_MAINTENANCE_MODE_OFF:
C
Corey Minyard 已提交
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			intf->maintenance_mode_enable = false;
C
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1211 1212 1213
			break;

		case IPMI_MAINTENANCE_MODE_ON:
C
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1214
			intf->maintenance_mode_enable = true;
C
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1215 1216 1217 1218 1219 1220
			break;

		default:
			rv = -EINVAL;
			goto out_unlock;
		}
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		intf->maintenance_mode = mode;
C
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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231

		maintenance_mode_update(intf);
	}
 out_unlock:
	spin_unlock_irqrestore(&intf->maintenance_mode_lock, flags);

	return rv;
}
EXPORT_SYMBOL(ipmi_set_maintenance_mode);

1232
int ipmi_set_gets_events(ipmi_user_t user, bool val)
L
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1233
{
1234 1235 1236 1237
	unsigned long        flags;
	ipmi_smi_t           intf = user->intf;
	struct ipmi_recv_msg *msg, *msg2;
	struct list_head     msgs;
L
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1238

1239 1240 1241
	INIT_LIST_HEAD(&msgs);

	spin_lock_irqsave(&intf->events_lock, flags);
1242 1243 1244
	if (user->gets_events == val)
		goto out;

L
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1245 1246
	user->gets_events = val;

1247 1248 1249 1250 1251 1252 1253
	if (val) {
		if (atomic_inc_return(&intf->event_waiters) == 1)
			need_waiter(intf);
	} else {
		atomic_dec(&intf->event_waiters);
	}

1254 1255 1256 1257 1258 1259 1260 1261 1262
	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)) {
A
Akinobu Mita 已提交
1263 1264
		list_for_each_entry_safe(msg, msg2, &intf->waiting_events, link)
			list_move_tail(&msg->link, &msgs);
1265
		intf->waiting_events_count = 0;
1266 1267 1268 1269 1270
		if (intf->event_msg_printed) {
			printk(KERN_WARNING PFX "Event queue no longer"
			       " full\n");
			intf->event_msg_printed = 0;
		}
1271

1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
		intf->delivering_events = 1;
		spin_unlock_irqrestore(&intf->events_lock, flags);

		list_for_each_entry_safe(msg, msg2, &msgs, link) {
			msg->user = user;
			kref_get(&user->refcount);
			deliver_response(msg);
		}

		spin_lock_irqsave(&intf->events_lock, flags);
		intf->delivering_events = 0;
1283 1284
	}

1285
 out:
1286
	spin_unlock_irqrestore(&intf->events_lock, flags);
L
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	return 0;
}
1290
EXPORT_SYMBOL(ipmi_set_gets_events);
L
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1291

1292 1293
static struct cmd_rcvr *find_cmd_rcvr(ipmi_smi_t    intf,
				      unsigned char netfn,
1294 1295
				      unsigned char cmd,
				      unsigned char chan)
1296 1297 1298 1299
{
	struct cmd_rcvr *rcvr;

	list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
1300 1301
		if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
					&& (rcvr->chans & (1 << chan)))
1302 1303 1304 1305 1306
			return rcvr;
	}
	return NULL;
}

1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321
static int is_cmd_rcvr_exclusive(ipmi_smi_t    intf,
				 unsigned char netfn,
				 unsigned char cmd,
				 unsigned int  chans)
{
	struct cmd_rcvr *rcvr;

	list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) {
		if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd)
					&& (rcvr->chans & chans))
			return 0;
	}
	return 1;
}

L
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int ipmi_register_for_cmd(ipmi_user_t   user,
			  unsigned char netfn,
1324 1325
			  unsigned char cmd,
			  unsigned int  chans)
L
Linus Torvalds 已提交
1326
{
1327 1328 1329
	ipmi_smi_t      intf = user->intf;
	struct cmd_rcvr *rcvr;
	int             rv = 0;
L
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1330 1331 1332


	rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL);
1333
	if (!rcvr)
L
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1334
		return -ENOMEM;
1335 1336
	rcvr->cmd = cmd;
	rcvr->netfn = netfn;
1337
	rcvr->chans = chans;
1338
	rcvr->user = user;
L
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1339

1340
	mutex_lock(&intf->cmd_rcvrs_mutex);
L
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1341
	/* Make sure the command/netfn is not already registered. */
1342
	if (!is_cmd_rcvr_exclusive(intf, netfn, cmd, chans)) {
1343 1344
		rv = -EBUSY;
		goto out_unlock;
L
Linus Torvalds 已提交
1345
	}
1346

1347 1348 1349
	if (atomic_inc_return(&intf->event_waiters) == 1)
		need_waiter(intf);

1350
	list_add_rcu(&rcvr->link, &intf->cmd_rcvrs);
L
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1351

1352
 out_unlock:
1353
	mutex_unlock(&intf->cmd_rcvrs_mutex);
L
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	if (rv)
		kfree(rcvr);

	return rv;
}
1359
EXPORT_SYMBOL(ipmi_register_for_cmd);
L
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1360 1361 1362

int ipmi_unregister_for_cmd(ipmi_user_t   user,
			    unsigned char netfn,
1363 1364
			    unsigned char cmd,
			    unsigned int  chans)
L
Linus Torvalds 已提交
1365
{
1366 1367
	ipmi_smi_t      intf = user->intf;
	struct cmd_rcvr *rcvr;
1368 1369
	struct cmd_rcvr *rcvrs = NULL;
	int i, rv = -ENOENT;
L
Linus Torvalds 已提交
1370

1371
	mutex_lock(&intf->cmd_rcvrs_mutex);
1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
	for (i = 0; i < IPMI_NUM_CHANNELS; i++) {
		if (((1 << i) & chans) == 0)
			continue;
		rcvr = find_cmd_rcvr(intf, netfn, cmd, i);
		if (rcvr == NULL)
			continue;
		if (rcvr->user == user) {
			rv = 0;
			rcvr->chans &= ~chans;
			if (rcvr->chans == 0) {
				list_del_rcu(&rcvr->link);
				rcvr->next = rcvrs;
				rcvrs = rcvr;
			}
		}
	}
	mutex_unlock(&intf->cmd_rcvrs_mutex);
	synchronize_rcu();
	while (rcvrs) {
1391
		atomic_dec(&intf->event_waiters);
1392 1393
		rcvr = rcvrs;
		rcvrs = rcvr->next;
1394
		kfree(rcvr);
L
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1395
	}
1396
	return rv;
L
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1397
}
1398
EXPORT_SYMBOL(ipmi_unregister_for_cmd);
L
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1399 1400 1401 1402 1403

static unsigned char
ipmb_checksum(unsigned char *data, int size)
{
	unsigned char csum = 0;
1404

L
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1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
	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);

1446 1447 1448 1449
	/*
	 * Add on the checksum size and the offset from the
	 * broadcast.
	 */
L
Linus Torvalds 已提交
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
	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);

1485 1486 1487 1488
	/*
	 * Add on the checksum size and the offset from the
	 * broadcast.
	 */
L
Linus Torvalds 已提交
1489 1490 1491 1492 1493
	smi_msg->data_size += 1;

	smi_msg->msgid = msgid;
}

A
Arnd Bergmann 已提交
1494 1495 1496
static struct ipmi_smi_msg *smi_add_send_msg(ipmi_smi_t intf,
					     struct ipmi_smi_msg *smi_msg,
					     int priority)
1497
{
1498 1499 1500 1501 1502 1503 1504 1505 1506
	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;
	}
A
Arnd Bergmann 已提交
1507 1508 1509 1510 1511

	return smi_msg;
}


1512
static void smi_send(ipmi_smi_t intf, const struct ipmi_smi_handlers *handlers,
A
Arnd Bergmann 已提交
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
		     struct ipmi_smi_msg *smi_msg, int priority)
{
	int run_to_completion = intf->run_to_completion;

	if (run_to_completion) {
		smi_msg = smi_add_send_msg(intf, smi_msg, priority);
	} else {
		unsigned long flags;

		spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
		smi_msg = smi_add_send_msg(intf, smi_msg, priority);
1524
		spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
A
Arnd Bergmann 已提交
1525
	}
1526 1527

	if (smi_msg)
1528
		handlers->sender(intf->send_info, smi_msg);
1529 1530
}

1531 1532 1533 1534 1535 1536
/*
 * 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.
 */
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549
static int i_ipmi_request(ipmi_user_t          user,
			  ipmi_smi_t           intf,
			  struct ipmi_addr     *addr,
			  long                 msgid,
			  struct kernel_ipmi_msg *msg,
			  void                 *user_msg_data,
			  void                 *supplied_smi,
			  struct ipmi_recv_msg *supplied_recv,
			  int                  priority,
			  unsigned char        source_address,
			  unsigned char        source_lun,
			  int                  retries,
			  unsigned int         retry_time_ms)
L
Linus Torvalds 已提交
1550
{
1551 1552 1553 1554
	int                      rv = 0;
	struct ipmi_smi_msg      *smi_msg;
	struct ipmi_recv_msg     *recv_msg;
	unsigned long            flags;
L
Linus Torvalds 已提交
1555 1556


1557
	if (supplied_recv)
L
Linus Torvalds 已提交
1558
		recv_msg = supplied_recv;
1559
	else {
L
Linus Torvalds 已提交
1560
		recv_msg = ipmi_alloc_recv_msg();
1561
		if (recv_msg == NULL)
L
Linus Torvalds 已提交
1562 1563 1564 1565
			return -ENOMEM;
	}
	recv_msg->user_msg_data = user_msg_data;

1566
	if (supplied_smi)
L
Linus Torvalds 已提交
1567
		smi_msg = (struct ipmi_smi_msg *) supplied_smi;
1568
	else {
L
Linus Torvalds 已提交
1569 1570 1571 1572 1573 1574 1575
		smi_msg = ipmi_alloc_smi_msg();
		if (smi_msg == NULL) {
			ipmi_free_recv_msg(recv_msg);
			return -ENOMEM;
		}
	}

1576
	rcu_read_lock();
1577
	if (intf->in_shutdown) {
1578 1579 1580 1581
		rv = -ENODEV;
		goto out_err;
	}

L
Linus Torvalds 已提交
1582
	recv_msg->user = user;
1583 1584
	if (user)
		kref_get(&user->refcount);
L
Linus Torvalds 已提交
1585
	recv_msg->msgid = msgid;
1586 1587 1588 1589
	/*
	 * Store the message to send in the receive message so timeout
	 * responses can get the proper response data.
	 */
L
Linus Torvalds 已提交
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602
	recv_msg->msg = *msg;

	if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) {
		struct ipmi_system_interface_addr *smi_addr;

		if (msg->netfn & 1) {
			/* Responses are not allowed to the SMI. */
			rv = -EINVAL;
			goto out_err;
		}

		smi_addr = (struct ipmi_system_interface_addr *) addr;
		if (smi_addr->lun > 3) {
1603
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1604 1605 1606 1607 1608 1609 1610 1611 1612
			rv = -EINVAL;
			goto out_err;
		}

		memcpy(&recv_msg->addr, smi_addr, sizeof(*smi_addr));

		if ((msg->netfn == IPMI_NETFN_APP_REQUEST)
		    && ((msg->cmd == IPMI_SEND_MSG_CMD)
			|| (msg->cmd == IPMI_GET_MSG_CMD)
1613 1614 1615 1616 1617
			|| (msg->cmd == IPMI_READ_EVENT_MSG_BUFFER_CMD))) {
			/*
			 * We don't let the user do these, since we manage
			 * the sequence numbers.
			 */
1618
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1619 1620 1621 1622
			rv = -EINVAL;
			goto out_err;
		}

C
Corey Minyard 已提交
1623 1624 1625
		if (((msg->netfn == IPMI_NETFN_APP_REQUEST)
		      && ((msg->cmd == IPMI_COLD_RESET_CMD)
			  || (msg->cmd == IPMI_WARM_RESET_CMD)))
1626
		     || (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST)) {
C
Corey Minyard 已提交
1627 1628 1629 1630
			spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
			intf->auto_maintenance_timeout
				= IPMI_MAINTENANCE_MODE_TIMEOUT;
			if (!intf->maintenance_mode
1631
			    && !intf->maintenance_mode_enable) {
C
Corey Minyard 已提交
1632
				intf->maintenance_mode_enable = true;
C
Corey Minyard 已提交
1633 1634 1635 1636 1637 1638
				maintenance_mode_update(intf);
			}
			spin_unlock_irqrestore(&intf->maintenance_mode_lock,
					       flags);
		}

L
Linus Torvalds 已提交
1639
		if ((msg->data_len + 2) > IPMI_MAX_MSG_LENGTH) {
1640
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
			rv = -EMSGSIZE;
			goto out_err;
		}

		smi_msg->data[0] = (msg->netfn << 2) | (smi_addr->lun & 0x3);
		smi_msg->data[1] = msg->cmd;
		smi_msg->msgid = msgid;
		smi_msg->user_data = recv_msg;
		if (msg->data_len > 0)
			memcpy(&(smi_msg->data[2]), msg->data, msg->data_len);
		smi_msg->data_size = msg->data_len + 2;
1652
		ipmi_inc_stat(intf, sent_local_commands);
1653
	} else if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) {
L
Linus Torvalds 已提交
1654 1655 1656 1657 1658
		struct ipmi_ipmb_addr *ipmb_addr;
		unsigned char         ipmb_seq;
		long                  seqid;
		int                   broadcast = 0;

1659
		if (addr->channel >= IPMI_MAX_CHANNELS) {
1660
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1661 1662 1663 1664 1665
			rv = -EINVAL;
			goto out_err;
		}

		if (intf->channels[addr->channel].medium
1666
					!= IPMI_CHANNEL_MEDIUM_IPMB) {
1667
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
			rv = -EINVAL;
			goto out_err;
		}

		if (retries < 0) {
		    if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)
			retries = 0; /* Don't retry broadcasts. */
		    else
			retries = 4;
		}
		if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) {
1679 1680 1681 1682 1683
		    /*
		     * Broadcasts add a zero at the beginning of the
		     * message, but otherwise is the same as an IPMB
		     * address.
		     */
L
Linus Torvalds 已提交
1684 1685 1686 1687 1688 1689 1690 1691 1692
		    addr->addr_type = IPMI_IPMB_ADDR_TYPE;
		    broadcast = 1;
		}


		/* Default to 1 second retries. */
		if (retry_time_ms == 0)
		    retry_time_ms = 1000;

1693 1694 1695 1696
		/*
		 * 9 for the header and 1 for the checksum, plus
		 * possibly one for the broadcast.
		 */
L
Linus Torvalds 已提交
1697
		if ((msg->data_len + 10 + broadcast) > IPMI_MAX_MSG_LENGTH) {
1698
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1699 1700 1701 1702 1703 1704
			rv = -EMSGSIZE;
			goto out_err;
		}

		ipmb_addr = (struct ipmi_ipmb_addr *) addr;
		if (ipmb_addr->lun > 3) {
1705
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1706 1707 1708 1709 1710 1711 1712
			rv = -EINVAL;
			goto out_err;
		}

		memcpy(&recv_msg->addr, ipmb_addr, sizeof(*ipmb_addr));

		if (recv_msg->msg.netfn & 0x1) {
1713 1714 1715 1716
			/*
			 * It's a response, so use the user's sequence
			 * from msgid.
			 */
1717
			ipmi_inc_stat(intf, sent_ipmb_responses);
L
Linus Torvalds 已提交
1718 1719 1720 1721
			format_ipmb_msg(smi_msg, msg, ipmb_addr, msgid,
					msgid, broadcast,
					source_address, source_lun);

1722 1723 1724 1725
			/*
			 * Save the receive message so we can use it
			 * to deliver the response.
			 */
L
Linus Torvalds 已提交
1726 1727 1728 1729 1730 1731
			smi_msg->user_data = recv_msg;
		} else {
			/* It's a command, so get a sequence for it. */

			spin_lock_irqsave(&(intf->seq_lock), flags);

1732 1733 1734 1735
			/*
			 * Create a sequence number with a 1 second
			 * timeout and 4 retries.
			 */
L
Linus Torvalds 已提交
1736 1737 1738 1739 1740 1741 1742 1743
			rv = intf_next_seq(intf,
					   recv_msg,
					   retry_time_ms,
					   retries,
					   broadcast,
					   &ipmb_seq,
					   &seqid);
			if (rv) {
1744 1745 1746 1747
				/*
				 * We have used up all the sequence numbers,
				 * probably, so abort.
				 */
L
Linus Torvalds 已提交
1748 1749 1750 1751 1752
				spin_unlock_irqrestore(&(intf->seq_lock),
						       flags);
				goto out_err;
			}

1753 1754
			ipmi_inc_stat(intf, sent_ipmb_commands);

1755 1756 1757 1758 1759
			/*
			 * Store the sequence number in the message,
			 * so that when the send message response
			 * comes back we can start the timer.
			 */
L
Linus Torvalds 已提交
1760 1761 1762 1763 1764
			format_ipmb_msg(smi_msg, msg, ipmb_addr,
					STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
					ipmb_seq, broadcast,
					source_address, source_lun);

1765 1766 1767 1768
			/*
			 * Copy the message into the recv message data, so we
			 * can retransmit it later if necessary.
			 */
L
Linus Torvalds 已提交
1769 1770 1771 1772 1773
			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;

1774 1775 1776 1777 1778 1779 1780 1781
			/*
			 * 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.
			 */
L
Linus Torvalds 已提交
1782 1783
			spin_unlock_irqrestore(&(intf->seq_lock), flags);
		}
1784
	} else if (is_lan_addr(addr)) {
L
Linus Torvalds 已提交
1785 1786 1787 1788
		struct ipmi_lan_addr  *lan_addr;
		unsigned char         ipmb_seq;
		long                  seqid;

1789
		if (addr->channel >= IPMI_MAX_CHANNELS) {
1790
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1791 1792 1793 1794 1795
			rv = -EINVAL;
			goto out_err;
		}

		if ((intf->channels[addr->channel].medium
1796
				!= IPMI_CHANNEL_MEDIUM_8023LAN)
L
Linus Torvalds 已提交
1797
		    && (intf->channels[addr->channel].medium
1798
				!= IPMI_CHANNEL_MEDIUM_ASYNC)) {
1799
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
			rv = -EINVAL;
			goto out_err;
		}

		retries = 4;

		/* Default to 1 second retries. */
		if (retry_time_ms == 0)
		    retry_time_ms = 1000;

		/* 11 for the header and 1 for the checksum. */
		if ((msg->data_len + 12) > IPMI_MAX_MSG_LENGTH) {
1812
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1813 1814 1815 1816 1817 1818
			rv = -EMSGSIZE;
			goto out_err;
		}

		lan_addr = (struct ipmi_lan_addr *) addr;
		if (lan_addr->lun > 3) {
1819
			ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1820 1821 1822 1823 1824 1825 1826
			rv = -EINVAL;
			goto out_err;
		}

		memcpy(&recv_msg->addr, lan_addr, sizeof(*lan_addr));

		if (recv_msg->msg.netfn & 0x1) {
1827 1828 1829 1830
			/*
			 * It's a response, so use the user's sequence
			 * from msgid.
			 */
1831
			ipmi_inc_stat(intf, sent_lan_responses);
L
Linus Torvalds 已提交
1832 1833 1834
			format_lan_msg(smi_msg, msg, lan_addr, msgid,
				       msgid, source_lun);

1835 1836 1837 1838
			/*
			 * Save the receive message so we can use it
			 * to deliver the response.
			 */
L
Linus Torvalds 已提交
1839 1840 1841 1842 1843 1844
			smi_msg->user_data = recv_msg;
		} else {
			/* It's a command, so get a sequence for it. */

			spin_lock_irqsave(&(intf->seq_lock), flags);

1845 1846 1847 1848
			/*
			 * Create a sequence number with a 1 second
			 * timeout and 4 retries.
			 */
L
Linus Torvalds 已提交
1849 1850 1851 1852 1853 1854 1855 1856
			rv = intf_next_seq(intf,
					   recv_msg,
					   retry_time_ms,
					   retries,
					   0,
					   &ipmb_seq,
					   &seqid);
			if (rv) {
1857 1858 1859 1860
				/*
				 * We have used up all the sequence numbers,
				 * probably, so abort.
				 */
L
Linus Torvalds 已提交
1861 1862 1863 1864 1865
				spin_unlock_irqrestore(&(intf->seq_lock),
						       flags);
				goto out_err;
			}

1866 1867
			ipmi_inc_stat(intf, sent_lan_commands);

1868 1869 1870 1871 1872
			/*
			 * Store the sequence number in the message,
			 * so that when the send message response
			 * comes back we can start the timer.
			 */
L
Linus Torvalds 已提交
1873 1874 1875 1876
			format_lan_msg(smi_msg, msg, lan_addr,
				       STORE_SEQ_IN_MSGID(ipmb_seq, seqid),
				       ipmb_seq, source_lun);

1877 1878 1879 1880
			/*
			 * Copy the message into the recv message data, so we
			 * can retransmit it later if necessary.
			 */
L
Linus Torvalds 已提交
1881 1882 1883 1884 1885
			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;

1886 1887 1888 1889 1890 1891 1892 1893
			/*
			 * 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.
			 */
L
Linus Torvalds 已提交
1894 1895 1896 1897
			spin_unlock_irqrestore(&(intf->seq_lock), flags);
		}
	} else {
	    /* Unknown address type. */
1898
		ipmi_inc_stat(intf, sent_invalid_commands);
L
Linus Torvalds 已提交
1899 1900 1901 1902 1903 1904 1905
		rv = -EINVAL;
		goto out_err;
	}

#ifdef DEBUG_MSGING
	{
		int m;
C
Corey Minyard 已提交
1906
		for (m = 0; m < smi_msg->data_size; m++)
L
Linus Torvalds 已提交
1907 1908 1909 1910
			printk(" %2.2x", smi_msg->data[m]);
		printk("\n");
	}
#endif
1911

1912
	smi_send(intf, intf->handlers, smi_msg, priority);
1913
	rcu_read_unlock();
L
Linus Torvalds 已提交
1914 1915 1916 1917

	return 0;

 out_err:
1918
	rcu_read_unlock();
L
Linus Torvalds 已提交
1919 1920 1921 1922 1923
	ipmi_free_smi_msg(smi_msg);
	ipmi_free_recv_msg(recv_msg);
	return rv;
}

1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935
static int check_addr(ipmi_smi_t       intf,
		      struct ipmi_addr *addr,
		      unsigned char    *saddr,
		      unsigned char    *lun)
{
	if (addr->channel >= IPMI_MAX_CHANNELS)
		return -EINVAL;
	*lun = intf->channels[addr->channel].lun;
	*saddr = intf->channels[addr->channel].address;
	return 0;
}

L
Linus Torvalds 已提交
1936 1937 1938 1939 1940 1941 1942 1943 1944
int ipmi_request_settime(ipmi_user_t      user,
			 struct ipmi_addr *addr,
			 long             msgid,
			 struct kernel_ipmi_msg  *msg,
			 void             *user_msg_data,
			 int              priority,
			 int              retries,
			 unsigned int     retry_time_ms)
{
1945
	unsigned char saddr = 0, lun = 0;
1946 1947
	int           rv;

1948
	if (!user)
1949
		return -EINVAL;
1950 1951 1952
	rv = check_addr(user->intf, addr, &saddr, &lun);
	if (rv)
		return rv;
L
Linus Torvalds 已提交
1953 1954 1955 1956 1957 1958 1959 1960
	return i_ipmi_request(user,
			      user->intf,
			      addr,
			      msgid,
			      msg,
			      user_msg_data,
			      NULL, NULL,
			      priority,
1961 1962
			      saddr,
			      lun,
L
Linus Torvalds 已提交
1963 1964 1965
			      retries,
			      retry_time_ms);
}
1966
EXPORT_SYMBOL(ipmi_request_settime);
L
Linus Torvalds 已提交
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976

int ipmi_request_supply_msgs(ipmi_user_t          user,
			     struct ipmi_addr     *addr,
			     long                 msgid,
			     struct kernel_ipmi_msg *msg,
			     void                 *user_msg_data,
			     void                 *supplied_smi,
			     struct ipmi_recv_msg *supplied_recv,
			     int                  priority)
{
1977
	unsigned char saddr = 0, lun = 0;
1978 1979
	int           rv;

1980
	if (!user)
1981
		return -EINVAL;
1982 1983 1984
	rv = check_addr(user->intf, addr, &saddr, &lun);
	if (rv)
		return rv;
L
Linus Torvalds 已提交
1985 1986 1987 1988 1989 1990 1991 1992 1993
	return i_ipmi_request(user,
			      user->intf,
			      addr,
			      msgid,
			      msg,
			      user_msg_data,
			      supplied_smi,
			      supplied_recv,
			      priority,
1994 1995
			      saddr,
			      lun,
L
Linus Torvalds 已提交
1996 1997
			      -1, 0);
}
1998
EXPORT_SYMBOL(ipmi_request_supply_msgs);
L
Linus Torvalds 已提交
1999

2000
#ifdef CONFIG_PROC_FS
2001
static int smi_ipmb_proc_show(struct seq_file *m, void *v)
L
Linus Torvalds 已提交
2002
{
2003
	ipmi_smi_t intf = m->private;
2004
	int        i;
L
Linus Torvalds 已提交
2005

2006 2007 2008
	seq_printf(m, "%x", intf->channels[0].address);
	for (i = 1; i < IPMI_MAX_CHANNELS; i++)
		seq_printf(m, " %x", intf->channels[i].address);
2009 2010
	seq_putc(m, '\n');

2011
	return 0;
L
Linus Torvalds 已提交
2012 2013
}

2014
static int smi_ipmb_proc_open(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
2015
{
A
Al Viro 已提交
2016
	return single_open(file, smi_ipmb_proc_show, PDE_DATA(inode));
2017
}
L
Linus Torvalds 已提交
2018

2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
static const struct file_operations smi_ipmb_proc_ops = {
	.open		= smi_ipmb_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int smi_version_proc_show(struct seq_file *m, void *v)
{
	ipmi_smi_t intf = m->private;

2030 2031 2032 2033
	seq_printf(m, "%u.%u\n",
		   ipmi_version_major(&intf->bmc->id),
		   ipmi_version_minor(&intf->bmc->id));

2034
	return 0;
L
Linus Torvalds 已提交
2035 2036
}

2037
static int smi_version_proc_open(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
2038
{
A
Al Viro 已提交
2039
	return single_open(file, smi_version_proc_show, PDE_DATA(inode));
2040 2041 2042 2043 2044 2045 2046 2047
}

static const struct file_operations smi_version_proc_ops = {
	.open		= smi_version_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
L
Linus Torvalds 已提交
2048

2049 2050 2051 2052 2053
static int smi_stats_proc_show(struct seq_file *m, void *v)
{
	ipmi_smi_t intf = m->private;

	seq_printf(m, "sent_invalid_commands:       %u\n",
2054
		       ipmi_get_stat(intf, sent_invalid_commands));
2055
	seq_printf(m, "sent_local_commands:         %u\n",
2056
		       ipmi_get_stat(intf, sent_local_commands));
2057
	seq_printf(m, "handled_local_responses:     %u\n",
2058
		       ipmi_get_stat(intf, handled_local_responses));
2059
	seq_printf(m, "unhandled_local_responses:   %u\n",
2060
		       ipmi_get_stat(intf, unhandled_local_responses));
2061
	seq_printf(m, "sent_ipmb_commands:          %u\n",
2062
		       ipmi_get_stat(intf, sent_ipmb_commands));
2063
	seq_printf(m, "sent_ipmb_command_errs:      %u\n",
2064
		       ipmi_get_stat(intf, sent_ipmb_command_errs));
2065
	seq_printf(m, "retransmitted_ipmb_commands: %u\n",
2066
		       ipmi_get_stat(intf, retransmitted_ipmb_commands));
2067
	seq_printf(m, "timed_out_ipmb_commands:     %u\n",
2068
		       ipmi_get_stat(intf, timed_out_ipmb_commands));
2069
	seq_printf(m, "timed_out_ipmb_broadcasts:   %u\n",
2070
		       ipmi_get_stat(intf, timed_out_ipmb_broadcasts));
2071
	seq_printf(m, "sent_ipmb_responses:         %u\n",
2072
		       ipmi_get_stat(intf, sent_ipmb_responses));
2073
	seq_printf(m, "handled_ipmb_responses:      %u\n",
2074
		       ipmi_get_stat(intf, handled_ipmb_responses));
2075
	seq_printf(m, "invalid_ipmb_responses:      %u\n",
2076
		       ipmi_get_stat(intf, invalid_ipmb_responses));
2077
	seq_printf(m, "unhandled_ipmb_responses:    %u\n",
2078
		       ipmi_get_stat(intf, unhandled_ipmb_responses));
2079
	seq_printf(m, "sent_lan_commands:           %u\n",
2080
		       ipmi_get_stat(intf, sent_lan_commands));
2081
	seq_printf(m, "sent_lan_command_errs:       %u\n",
2082
		       ipmi_get_stat(intf, sent_lan_command_errs));
2083
	seq_printf(m, "retransmitted_lan_commands:  %u\n",
2084
		       ipmi_get_stat(intf, retransmitted_lan_commands));
2085
	seq_printf(m, "timed_out_lan_commands:      %u\n",
2086
		       ipmi_get_stat(intf, timed_out_lan_commands));
2087
	seq_printf(m, "sent_lan_responses:          %u\n",
2088
		       ipmi_get_stat(intf, sent_lan_responses));
2089
	seq_printf(m, "handled_lan_responses:       %u\n",
2090
		       ipmi_get_stat(intf, handled_lan_responses));
2091
	seq_printf(m, "invalid_lan_responses:       %u\n",
2092
		       ipmi_get_stat(intf, invalid_lan_responses));
2093
	seq_printf(m, "unhandled_lan_responses:     %u\n",
2094
		       ipmi_get_stat(intf, unhandled_lan_responses));
2095
	seq_printf(m, "handled_commands:            %u\n",
2096
		       ipmi_get_stat(intf, handled_commands));
2097
	seq_printf(m, "invalid_commands:            %u\n",
2098
		       ipmi_get_stat(intf, invalid_commands));
2099
	seq_printf(m, "unhandled_commands:          %u\n",
2100
		       ipmi_get_stat(intf, unhandled_commands));
2101
	seq_printf(m, "invalid_events:              %u\n",
2102
		       ipmi_get_stat(intf, invalid_events));
2103
	seq_printf(m, "events:                      %u\n",
2104
		       ipmi_get_stat(intf, events));
2105
	seq_printf(m, "failed rexmit LAN msgs:      %u\n",
2106
		       ipmi_get_stat(intf, dropped_rexmit_lan_commands));
2107
	seq_printf(m, "failed rexmit IPMB msgs:     %u\n",
2108
		       ipmi_get_stat(intf, dropped_rexmit_ipmb_commands));
2109 2110
	return 0;
}
L
Linus Torvalds 已提交
2111

2112 2113
static int smi_stats_proc_open(struct inode *inode, struct file *file)
{
A
Al Viro 已提交
2114
	return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
L
Linus Torvalds 已提交
2115
}
2116 2117 2118 2119 2120 2121 2122

static const struct file_operations smi_stats_proc_ops = {
	.open		= smi_stats_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
2123
#endif /* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2124 2125

int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
2126
			    const struct file_operations *proc_ops,
2127
			    void *data)
L
Linus Torvalds 已提交
2128 2129
{
	int                    rv = 0;
2130 2131
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry  *file;
L
Linus Torvalds 已提交
2132 2133 2134 2135 2136 2137
	struct ipmi_proc_entry *entry;

	/* Create a list element. */
	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;
2138
	entry->name = kstrdup(name, GFP_KERNEL);
L
Linus Torvalds 已提交
2139 2140 2141 2142 2143
	if (!entry->name) {
		kfree(entry);
		return -ENOMEM;
	}

2144
	file = proc_create_data(name, 0, smi->proc_dir, proc_ops, data);
L
Linus Torvalds 已提交
2145 2146 2147 2148 2149
	if (!file) {
		kfree(entry->name);
		kfree(entry);
		rv = -ENOMEM;
	} else {
C
Corey Minyard 已提交
2150
		mutex_lock(&smi->proc_entry_lock);
L
Linus Torvalds 已提交
2151 2152 2153
		/* Stick it on the list. */
		entry->next = smi->proc_entries;
		smi->proc_entries = entry;
C
Corey Minyard 已提交
2154
		mutex_unlock(&smi->proc_entry_lock);
L
Linus Torvalds 已提交
2155
	}
2156
#endif /* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2157 2158 2159

	return rv;
}
2160
EXPORT_SYMBOL(ipmi_smi_add_proc_entry);
L
Linus Torvalds 已提交
2161 2162 2163 2164 2165

static int add_proc_entries(ipmi_smi_t smi, int num)
{
	int rv = 0;

2166
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
2167 2168 2169 2170 2171 2172 2173
	sprintf(smi->proc_dir_name, "%d", num);
	smi->proc_dir = proc_mkdir(smi->proc_dir_name, proc_ipmi_root);
	if (!smi->proc_dir)
		rv = -ENOMEM;

	if (rv == 0)
		rv = ipmi_smi_add_proc_entry(smi, "stats",
2174
					     &smi_stats_proc_ops,
2175
					     smi);
L
Linus Torvalds 已提交
2176 2177 2178

	if (rv == 0)
		rv = ipmi_smi_add_proc_entry(smi, "ipmb",
2179
					     &smi_ipmb_proc_ops,
2180
					     smi);
L
Linus Torvalds 已提交
2181 2182 2183

	if (rv == 0)
		rv = ipmi_smi_add_proc_entry(smi, "version",
2184
					     &smi_version_proc_ops,
2185
					     smi);
2186
#endif /* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2187 2188 2189 2190 2191 2192

	return rv;
}

static void remove_proc_entries(ipmi_smi_t smi)
{
2193
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
2194 2195
	struct ipmi_proc_entry *entry;

C
Corey Minyard 已提交
2196
	mutex_lock(&smi->proc_entry_lock);
L
Linus Torvalds 已提交
2197 2198 2199 2200 2201 2202 2203 2204
	while (smi->proc_entries) {
		entry = smi->proc_entries;
		smi->proc_entries = entry->next;

		remove_proc_entry(entry->name, smi->proc_dir);
		kfree(entry->name);
		kfree(entry);
	}
C
Corey Minyard 已提交
2205
	mutex_unlock(&smi->proc_entry_lock);
L
Linus Torvalds 已提交
2206
	remove_proc_entry(smi->proc_dir_name, proc_ipmi_root);
2207
#endif /* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2208 2209
}

2210 2211 2212
static int __find_bmc_guid(struct device *dev, void *data)
{
	unsigned char *id = data;
2213
	struct bmc_device *bmc = to_bmc_device(dev);
2214 2215 2216 2217 2218 2219 2220 2221 2222 2223
	return memcmp(bmc->guid, id, 16) == 0;
}

static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv,
					     unsigned char *guid)
{
	struct device *dev;

	dev = driver_find_device(drv, NULL, guid, __find_bmc_guid);
	if (dev)
2224
		return to_bmc_device(dev);
2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236
	else
		return NULL;
}

struct prod_dev_id {
	unsigned int  product_id;
	unsigned char device_id;
};

static int __find_bmc_prod_dev_id(struct device *dev, void *data)
{
	struct prod_dev_id *id = data;
2237
	struct bmc_device *bmc = to_bmc_device(dev);
2238 2239 2240 2241 2242 2243 2244

	return (bmc->id.product_id == id->product_id
		&& bmc->id.device_id == id->device_id);
}

static struct bmc_device *ipmi_find_bmc_prod_dev_id(
	struct device_driver *drv,
2245
	unsigned int product_id, unsigned char device_id)
2246 2247 2248 2249 2250 2251 2252 2253 2254
{
	struct prod_dev_id id = {
		.product_id = product_id,
		.device_id = device_id,
	};
	struct device *dev;

	dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id);
	if (dev)
2255
		return to_bmc_device(dev);
2256 2257 2258 2259 2260 2261 2262 2263
	else
		return NULL;
}

static ssize_t device_id_show(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
2264
	struct bmc_device *bmc = to_bmc_device(dev);
2265 2266 2267

	return snprintf(buf, 10, "%u\n", bmc->id.device_id);
}
2268
static DEVICE_ATTR(device_id, S_IRUGO, device_id_show, NULL);
2269

2270 2271 2272
static ssize_t provides_device_sdrs_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
2273
{
2274
	struct bmc_device *bmc = to_bmc_device(dev);
2275 2276

	return snprintf(buf, 10, "%u\n",
C
Corey Minyard 已提交
2277
			(bmc->id.device_revision & 0x80) >> 7);
2278
}
2279 2280
static DEVICE_ATTR(provides_device_sdrs, S_IRUGO, provides_device_sdrs_show,
		   NULL);
2281 2282 2283 2284

static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
2285
	struct bmc_device *bmc = to_bmc_device(dev);
2286 2287

	return snprintf(buf, 20, "%u\n",
C
Corey Minyard 已提交
2288
			bmc->id.device_revision & 0x0F);
2289
}
2290
static DEVICE_ATTR(revision, S_IRUGO, revision_show, NULL);
2291

2292 2293 2294
static ssize_t firmware_revision_show(struct device *dev,
				      struct device_attribute *attr,
				      char *buf)
2295
{
2296
	struct bmc_device *bmc = to_bmc_device(dev);
2297 2298 2299 2300

	return snprintf(buf, 20, "%u.%x\n", bmc->id.firmware_revision_1,
			bmc->id.firmware_revision_2);
}
2301
static DEVICE_ATTR(firmware_revision, S_IRUGO, firmware_revision_show, NULL);
2302 2303 2304 2305 2306

static ssize_t ipmi_version_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
2307
	struct bmc_device *bmc = to_bmc_device(dev);
2308 2309 2310 2311 2312

	return snprintf(buf, 20, "%u.%u\n",
			ipmi_version_major(&bmc->id),
			ipmi_version_minor(&bmc->id));
}
2313
static DEVICE_ATTR(ipmi_version, S_IRUGO, ipmi_version_show, NULL);
2314 2315 2316 2317 2318

static ssize_t add_dev_support_show(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
2319
	struct bmc_device *bmc = to_bmc_device(dev);
2320 2321 2322 2323

	return snprintf(buf, 10, "0x%02x\n",
			bmc->id.additional_device_support);
}
2324 2325
static DEVICE_ATTR(additional_device_support, S_IRUGO, add_dev_support_show,
		   NULL);
2326 2327 2328 2329 2330

static ssize_t manufacturer_id_show(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
2331
	struct bmc_device *bmc = to_bmc_device(dev);
2332 2333 2334

	return snprintf(buf, 20, "0x%6.6x\n", bmc->id.manufacturer_id);
}
2335
static DEVICE_ATTR(manufacturer_id, S_IRUGO, manufacturer_id_show, NULL);
2336 2337 2338 2339 2340

static ssize_t product_id_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
2341
	struct bmc_device *bmc = to_bmc_device(dev);
2342 2343 2344

	return snprintf(buf, 10, "0x%4.4x\n", bmc->id.product_id);
}
2345
static DEVICE_ATTR(product_id, S_IRUGO, product_id_show, NULL);
2346 2347 2348 2349 2350

static ssize_t aux_firmware_rev_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
2351
	struct bmc_device *bmc = to_bmc_device(dev);
2352 2353 2354 2355 2356 2357 2358

	return snprintf(buf, 21, "0x%02x 0x%02x 0x%02x 0x%02x\n",
			bmc->id.aux_firmware_revision[3],
			bmc->id.aux_firmware_revision[2],
			bmc->id.aux_firmware_revision[1],
			bmc->id.aux_firmware_revision[0]);
}
2359
static DEVICE_ATTR(aux_firmware_revision, S_IRUGO, aux_firmware_rev_show, NULL);
2360 2361 2362 2363

static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
2364
	struct bmc_device *bmc = to_bmc_device(dev);
2365 2366 2367 2368 2369

	return snprintf(buf, 100, "%Lx%Lx\n",
			(long long) bmc->guid[0],
			(long long) bmc->guid[8]);
}
2370
static DEVICE_ATTR(guid, S_IRUGO, guid_show, NULL);
2371 2372 2373 2374 2375 2376 2377 2378 2379 2380

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,
2381 2382
	&dev_attr_aux_firmware_revision.attr,
	&dev_attr_guid.attr,
2383 2384
	NULL
};
2385

2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399
static umode_t bmc_dev_attr_is_visible(struct kobject *kobj,
				       struct attribute *attr, int idx)
{
	struct device *dev = kobj_to_dev(kobj);
	struct bmc_device *bmc = to_bmc_device(dev);
	umode_t mode = attr->mode;

	if (attr == &dev_attr_aux_firmware_revision.attr)
		return bmc->id.aux_firmware_revision_set ? mode : 0;
	if (attr == &dev_attr_guid.attr)
		return bmc->guid_set ? mode : 0;
	return mode;
}

2400 2401
static struct attribute_group bmc_dev_attr_group = {
	.attrs		= bmc_dev_attrs,
2402
	.is_visible	= bmc_dev_attr_is_visible,
2403
};
J
Jeff Garzik 已提交
2404

2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417
static const struct attribute_group *bmc_dev_attr_groups[] = {
	&bmc_dev_attr_group,
	NULL
};

static struct device_type bmc_device_type = {
	.groups		= bmc_dev_attr_groups,
};

static void
release_bmc_device(struct device *dev)
{
	kfree(to_bmc_device(dev));
J
Jeff Garzik 已提交
2418 2419 2420 2421 2422
}

static void
cleanup_bmc_device(struct kref *ref)
{
2423
	struct bmc_device *bmc = container_of(ref, struct bmc_device, usecount);
J
Jeff Garzik 已提交
2424

2425
	platform_device_unregister(&bmc->pdev);
2426 2427 2428 2429 2430 2431
}

static void ipmi_bmc_unregister(ipmi_smi_t intf)
{
	struct bmc_device *bmc = intf->bmc;

2432
	sysfs_remove_link(&intf->si_dev->kobj, "bmc");
2433
	if (intf->my_dev_name) {
2434
		sysfs_remove_link(&bmc->pdev.dev.kobj, intf->my_dev_name);
2435 2436 2437 2438 2439
		kfree(intf->my_dev_name);
		intf->my_dev_name = NULL;
	}

	mutex_lock(&ipmidriver_mutex);
2440
	kref_put(&bmc->usecount, cleanup_bmc_device);
2441
	intf->bmc = NULL;
2442 2443 2444
	mutex_unlock(&ipmidriver_mutex);
}

2445
static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum)
2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457
{
	int               rv;
	struct bmc_device *bmc = intf->bmc;
	struct bmc_device *old_bmc;

	mutex_lock(&ipmidriver_mutex);

	/*
	 * Try to find if there is an bmc_device struct
	 * representing the interfaced BMC already
	 */
	if (bmc->guid_set)
2458
		old_bmc = ipmi_find_bmc_guid(&ipmidriver.driver, bmc->guid);
2459
	else
2460
		old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472
						    bmc->id.product_id,
						    bmc->id.device_id);

	/*
	 * If there is already an bmc_device, free the new one,
	 * otherwise register the new BMC device
	 */
	if (old_bmc) {
		kfree(bmc);
		intf->bmc = old_bmc;
		bmc = old_bmc;

2473
		kref_get(&bmc->usecount);
2474 2475 2476 2477 2478 2479 2480 2481 2482
		mutex_unlock(&ipmidriver_mutex);

		printk(KERN_INFO
		       "ipmi: interfacing existing BMC (man_id: 0x%6.6x,"
		       " prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
		       bmc->id.manufacturer_id,
		       bmc->id.product_id,
		       bmc->id.device_id);
	} else {
2483 2484 2485
		unsigned char orig_dev_id = bmc->id.device_id;
		int warn_printed = 0;

2486
		snprintf(bmc->name, sizeof(bmc->name),
2487
			 "ipmi_bmc.%4.4x", bmc->id.product_id);
2488
		bmc->pdev.name = bmc->name;
2489

2490
		while (ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
2491
						 bmc->id.product_id,
C
Corey Minyard 已提交
2492
						 bmc->id.device_id)) {
2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511
			if (!warn_printed) {
				printk(KERN_WARNING PFX
				       "This machine has two different BMCs"
				       " with the same product id and device"
				       " id.  This is an error in the"
				       " firmware, but incrementing the"
				       " device id to work around the problem."
				       " Prod ID = 0x%x, Dev ID = 0x%x\n",
				       bmc->id.product_id, bmc->id.device_id);
				warn_printed = 1;
			}
			bmc->id.device_id++; /* Wraps at 255 */
			if (bmc->id.device_id == orig_dev_id) {
				printk(KERN_ERR PFX
				       "Out of device ids!\n");
				break;
			}
		}

2512 2513 2514 2515
		bmc->pdev.dev.driver = &ipmidriver.driver;
		bmc->pdev.id = bmc->id.device_id;
		bmc->pdev.dev.release = release_bmc_device;
		bmc->pdev.dev.type = &bmc_device_type;
2516
		kref_init(&bmc->usecount);
2517

2518
		rv = platform_device_register(&bmc->pdev);
2519 2520
		mutex_unlock(&ipmidriver_mutex);
		if (rv) {
2521
			put_device(&bmc->pdev.dev);
2522 2523 2524 2525
			printk(KERN_ERR
			       "ipmi_msghandler:"
			       " Unable to register bmc device: %d\n",
			       rv);
2526 2527 2528 2529
			/*
			 * Don't go to out_err, you can only do that if
			 * the device is registered already.
			 */
2530 2531 2532
			return rv;
		}

2533 2534 2535 2536 2537
		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);
2538 2539 2540 2541 2542 2543
	}

	/*
	 * create symlink from system interface device to bmc device
	 * and back.
	 */
2544
	rv = sysfs_create_link(&intf->si_dev->kobj, &bmc->pdev.dev.kobj, "bmc");
2545 2546 2547 2548 2549 2550 2551
	if (rv) {
		printk(KERN_ERR
		       "ipmi_msghandler: Unable to create bmc symlink: %d\n",
		       rv);
		goto out_err;
	}

2552
	intf->my_dev_name = kasprintf(GFP_KERNEL, "ipmi%d", ifnum);
2553 2554 2555 2556 2557 2558 2559 2560
	if (!intf->my_dev_name) {
		rv = -ENOMEM;
		printk(KERN_ERR
		       "ipmi_msghandler: allocate link from BMC: %d\n",
		       rv);
		goto out_err;
	}

2561
	rv = sysfs_create_link(&bmc->pdev.dev.kobj, &intf->si_dev->kobj,
2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653
			       intf->my_dev_name);
	if (rv) {
		kfree(intf->my_dev_name);
		intf->my_dev_name = NULL;
		printk(KERN_ERR
		       "ipmi_msghandler:"
		       " Unable to create symlink to bmc: %d\n",
		       rv);
		goto out_err;
	}

	return 0;

out_err:
	ipmi_bmc_unregister(intf);
	return rv;
}

static int
send_guid_cmd(ipmi_smi_t intf, int chan)
{
	struct kernel_ipmi_msg            msg;
	struct ipmi_system_interface_addr si;

	si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	si.channel = IPMI_BMC_CHANNEL;
	si.lun = 0;

	msg.netfn = IPMI_NETFN_APP_REQUEST;
	msg.cmd = IPMI_GET_DEVICE_GUID_CMD;
	msg.data = NULL;
	msg.data_len = 0;
	return i_ipmi_request(NULL,
			      intf,
			      (struct ipmi_addr *) &si,
			      0,
			      &msg,
			      intf,
			      NULL,
			      NULL,
			      0,
			      intf->channels[0].address,
			      intf->channels[0].lun,
			      -1, 0);
}

static void
guid_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
	if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
	    || (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE)
	    || (msg->msg.cmd != IPMI_GET_DEVICE_GUID_CMD))
		/* Not for me */
		return;

	if (msg->msg.data[0] != 0) {
		/* Error from getting the GUID, the BMC doesn't have one. */
		intf->bmc->guid_set = 0;
		goto out;
	}

	if (msg->msg.data_len < 17) {
		intf->bmc->guid_set = 0;
		printk(KERN_WARNING PFX
		       "guid_handler: The GUID response from the BMC was too"
		       " short, it was %d but should have been 17.  Assuming"
		       " GUID is not available.\n",
		       msg->msg.data_len);
		goto out;
	}

	memcpy(intf->bmc->guid, msg->msg.data, 16);
	intf->bmc->guid_set = 1;
 out:
	wake_up(&intf->waitq);
}

static void
get_guid(ipmi_smi_t intf)
{
	int rv;

	intf->bmc->guid_set = 0x2;
	intf->null_user_handler = guid_handler;
	rv = send_guid_cmd(intf, 0);
	if (rv)
		/* Send failed, no GUID available. */
		intf->bmc->guid_set = 0;
	wait_event(intf->waitq, intf->bmc->guid_set != 2);
	intf->null_user_handler = NULL;
}

L
Linus Torvalds 已提交
2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674
static int
send_channel_info_cmd(ipmi_smi_t intf, int chan)
{
	struct kernel_ipmi_msg            msg;
	unsigned char                     data[1];
	struct ipmi_system_interface_addr si;

	si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	si.channel = IPMI_BMC_CHANNEL;
	si.lun = 0;

	msg.netfn = IPMI_NETFN_APP_REQUEST;
	msg.cmd = IPMI_GET_CHANNEL_INFO_CMD;
	msg.data = data;
	msg.data_len = 1;
	data[0] = chan;
	return i_ipmi_request(NULL,
			      intf,
			      (struct ipmi_addr *) &si,
			      0,
			      &msg,
2675
			      intf,
L
Linus Torvalds 已提交
2676 2677 2678
			      NULL,
			      NULL,
			      0,
2679 2680
			      intf->channels[0].address,
			      intf->channels[0].lun,
L
Linus Torvalds 已提交
2681 2682 2683 2684
			      -1, 0);
}

static void
2685
channel_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
L
Linus Torvalds 已提交
2686 2687 2688 2689
{
	int rv = 0;
	int chan;

2690 2691
	if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
	    && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
2692
	    && (msg->msg.cmd == IPMI_GET_CHANNEL_INFO_CMD)) {
L
Linus Torvalds 已提交
2693
		/* It's the one we want */
2694
		if (msg->msg.data[0] != 0) {
L
Linus Torvalds 已提交
2695 2696
			/* Got an error from the channel, just go on. */

2697
			if (msg->msg.data[0] == IPMI_INVALID_COMMAND_ERR) {
2698 2699 2700 2701 2702 2703
				/*
				 * If the MC does not support this
				 * command, that is legal.  We just
				 * assume it has one IPMB at channel
				 * zero.
				 */
L
Linus Torvalds 已提交
2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714
				intf->channels[0].medium
					= IPMI_CHANNEL_MEDIUM_IPMB;
				intf->channels[0].protocol
					= IPMI_CHANNEL_PROTOCOL_IPMB;

				intf->curr_channel = IPMI_MAX_CHANNELS;
				wake_up(&intf->waitq);
				goto out;
			}
			goto next_channel;
		}
2715
		if (msg->msg.data_len < 4) {
L
Linus Torvalds 已提交
2716 2717 2718 2719
			/* Message not big enough, just go on. */
			goto next_channel;
		}
		chan = intf->curr_channel;
2720 2721
		intf->channels[chan].medium = msg->msg.data[2] & 0x7f;
		intf->channels[chan].protocol = msg->msg.data[3] & 0x1f;
L
Linus Torvalds 已提交
2722

2723
 next_channel:
L
Linus Torvalds 已提交
2724 2725 2726 2727 2728 2729 2730 2731
		intf->curr_channel++;
		if (intf->curr_channel >= IPMI_MAX_CHANNELS)
			wake_up(&intf->waitq);
		else
			rv = send_channel_info_cmd(intf, intf->curr_channel);

		if (rv) {
			/* Got an error somehow, just give up. */
2732 2733 2734 2735
			printk(KERN_WARNING PFX
			       "Error sending channel information for channel"
			       " %d: %d\n", intf->curr_channel, rv);

L
Linus Torvalds 已提交
2736 2737 2738 2739 2740 2741 2742 2743
			intf->curr_channel = IPMI_MAX_CHANNELS;
			wake_up(&intf->waitq);
		}
	}
 out:
	return;
}

2744
static void ipmi_poll(ipmi_smi_t intf)
C
Corey Minyard 已提交
2745 2746 2747
{
	if (intf->handlers->poll)
		intf->handlers->poll(intf->send_info);
2748 2749
	/* In case something came in */
	handle_new_recv_msgs(intf);
C
Corey Minyard 已提交
2750
}
2751 2752 2753 2754

void ipmi_poll_interface(ipmi_user_t user)
{
	ipmi_poll(user->intf);
C
Corey Minyard 已提交
2755
}
2756
EXPORT_SYMBOL(ipmi_poll_interface);
C
Corey Minyard 已提交
2757

2758
int ipmi_register_smi(const struct ipmi_smi_handlers *handlers,
L
Linus Torvalds 已提交
2759
		      void		       *send_info,
2760 2761
		      struct ipmi_device_id    *device_id,
		      struct device            *si_dev,
2762
		      unsigned char            slave_addr)
L
Linus Torvalds 已提交
2763 2764 2765
{
	int              i, j;
	int              rv;
2766
	ipmi_smi_t       intf;
2767 2768
	ipmi_smi_t       tintf;
	struct list_head *link;
L
Linus Torvalds 已提交
2769

2770 2771 2772 2773
	/*
	 * Make sure the driver is actually initialized, this handles
	 * problems with initialization order.
	 */
L
Linus Torvalds 已提交
2774 2775 2776 2777
	if (!initialized) {
		rv = ipmi_init_msghandler();
		if (rv)
			return rv;
2778 2779 2780 2781
		/*
		 * The init code doesn't return an error if it was turned
		 * off, but it won't initialize.  Check that.
		 */
L
Linus Torvalds 已提交
2782 2783 2784 2785
		if (!initialized)
			return -ENODEV;
	}

2786
	intf = kzalloc(sizeof(*intf), GFP_KERNEL);
2787
	if (!intf)
L
Linus Torvalds 已提交
2788
		return -ENOMEM;
2789 2790 2791 2792

	intf->ipmi_version_major = ipmi_version_major(device_id);
	intf->ipmi_version_minor = ipmi_version_minor(device_id);

2793 2794 2795 2796 2797
	intf->bmc = kzalloc(sizeof(*intf->bmc), GFP_KERNEL);
	if (!intf->bmc) {
		kfree(intf);
		return -ENOMEM;
	}
2798
	intf->intf_num = -1; /* Mark it invalid for now. */
2799
	kref_init(&intf->refcount);
2800 2801
	intf->bmc->id = *device_id;
	intf->si_dev = si_dev;
2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817
	for (j = 0; j < IPMI_MAX_CHANNELS; j++) {
		intf->channels[j].address = IPMI_BMC_SLAVE_ADDR;
		intf->channels[j].lun = 2;
	}
	if (slave_addr != 0)
		intf->channels[0].address = slave_addr;
	INIT_LIST_HEAD(&intf->users);
	intf->handlers = handlers;
	intf->send_info = send_info;
	spin_lock_init(&intf->seq_lock);
	for (j = 0; j < IPMI_IPMB_NUM_SEQ; j++) {
		intf->seq_table[j].inuse = 0;
		intf->seq_table[j].seqid = 0;
	}
	intf->curr_seq = 0;
#ifdef CONFIG_PROC_FS
C
Corey Minyard 已提交
2818
	mutex_init(&intf->proc_entry_lock);
2819
#endif
2820 2821
	spin_lock_init(&intf->waiting_rcv_msgs_lock);
	INIT_LIST_HEAD(&intf->waiting_rcv_msgs);
2822 2823 2824 2825
	tasklet_init(&intf->recv_tasklet,
		     smi_recv_tasklet,
		     (unsigned long) intf);
	atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0);
2826 2827 2828
	spin_lock_init(&intf->xmit_msgs_lock);
	INIT_LIST_HEAD(&intf->xmit_msgs);
	INIT_LIST_HEAD(&intf->hp_xmit_msgs);
2829
	spin_lock_init(&intf->events_lock);
2830 2831
	atomic_set(&intf->event_waiters, 0);
	intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
2832 2833
	INIT_LIST_HEAD(&intf->waiting_events);
	intf->waiting_events_count = 0;
2834
	mutex_init(&intf->cmd_rcvrs_mutex);
C
Corey Minyard 已提交
2835
	spin_lock_init(&intf->maintenance_mode_lock);
2836 2837
	INIT_LIST_HEAD(&intf->cmd_rcvrs);
	init_waitqueue_head(&intf->waitq);
2838 2839
	for (i = 0; i < IPMI_NUM_STATS; i++)
		atomic_set(&intf->stats[i], 0);
2840 2841

	intf->proc_dir = NULL;
L
Linus Torvalds 已提交
2842

2843
	mutex_lock(&smi_watchers_mutex);
2844 2845 2846 2847 2848 2849 2850
	mutex_lock(&ipmi_interfaces_mutex);
	/* Look for a hole in the numbers. */
	i = 0;
	link = &ipmi_interfaces;
	list_for_each_entry_rcu(tintf, &ipmi_interfaces, link) {
		if (tintf->intf_num != i) {
			link = &tintf->link;
L
Linus Torvalds 已提交
2851 2852
			break;
		}
2853
		i++;
L
Linus Torvalds 已提交
2854
	}
2855 2856 2857 2858 2859
	/* 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);
L
Linus Torvalds 已提交
2860

2861 2862 2863
	rv = handlers->start_processing(send_info, intf);
	if (rv)
		goto out;
L
Linus Torvalds 已提交
2864

2865 2866
	get_guid(intf);

2867
	if ((intf->ipmi_version_major > 1)
2868 2869 2870 2871 2872 2873
			|| ((intf->ipmi_version_major == 1)
			    && (intf->ipmi_version_minor >= 5))) {
		/*
		 * Start scanning the channels to see what is
		 * available.
		 */
2874 2875 2876
		intf->null_user_handler = channel_handler;
		intf->curr_channel = 0;
		rv = send_channel_info_cmd(intf, 0);
2877 2878 2879 2880
		if (rv) {
			printk(KERN_WARNING PFX
			       "Error sending channel information for channel"
			       " 0, %d\n", rv);
2881
			goto out;
2882
		}
L
Linus Torvalds 已提交
2883

2884 2885 2886
		/* Wait for the channel info to be read. */
		wait_event(intf->waitq,
			   intf->curr_channel >= IPMI_MAX_CHANNELS);
2887
		intf->null_user_handler = NULL;
2888 2889 2890 2891
	} else {
		/* Assume a single IPMB channel at zero. */
		intf->channels[0].medium = IPMI_CHANNEL_MEDIUM_IPMB;
		intf->channels[0].protocol = IPMI_CHANNEL_PROTOCOL_IPMB;
C
Corey Minyard 已提交
2892
		intf->curr_channel = IPMI_MAX_CHANNELS;
L
Linus Torvalds 已提交
2893 2894
	}

2895 2896
	rv = ipmi_bmc_register(intf, i);

2897 2898
	if (rv == 0)
		rv = add_proc_entries(intf, i);
L
Linus Torvalds 已提交
2899

2900
 out:
L
Linus Torvalds 已提交
2901
	if (rv) {
2902 2903
		if (intf->proc_dir)
			remove_proc_entries(intf);
2904
		intf->handlers = NULL;
2905 2906
		list_del_rcu(&intf->link);
		mutex_unlock(&ipmi_interfaces_mutex);
2907
		mutex_unlock(&smi_watchers_mutex);
2908
		synchronize_rcu();
2909 2910
		kref_put(&intf->refcount, intf_free);
	} else {
2911 2912 2913 2914 2915 2916
		/*
		 * 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();
2917 2918
		intf->intf_num = i;
		mutex_unlock(&ipmi_interfaces_mutex);
2919
		/* After this point the interface is legal to use. */
2920
		call_smi_watchers(i, intf->si_dev);
2921
		mutex_unlock(&smi_watchers_mutex);
L
Linus Torvalds 已提交
2922 2923 2924 2925
	}

	return rv;
}
2926
EXPORT_SYMBOL(ipmi_register_smi);
L
Linus Torvalds 已提交
2927

2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939
static void deliver_smi_err_response(ipmi_smi_t intf,
				     struct ipmi_smi_msg *msg,
				     unsigned char err)
{
	msg->rsp[0] = msg->data[0] | 4;
	msg->rsp[1] = msg->data[1];
	msg->rsp[2] = err;
	msg->rsp_size = 3;
	/* It's an error, so it will never requeue, no need to check return. */
	handle_one_recv_msg(intf, msg);
}

2940 2941 2942 2943
static void cleanup_smi_msgs(ipmi_smi_t intf)
{
	int              i;
	struct seq_table *ent;
2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957
	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);
	}
2958 2959

	/* No need for locks, the interface is down. */
2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971

	/*
	 * 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);
	}

2972 2973 2974 2975 2976 2977 2978 2979
	for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
		ent = &(intf->seq_table[i]);
		if (!ent->inuse)
			continue;
		deliver_err_response(ent->recv_msg, IPMI_ERR_UNSPECIFIED);
	}
}

L
Linus Torvalds 已提交
2980 2981 2982
int ipmi_unregister_smi(ipmi_smi_t intf)
{
	struct ipmi_smi_watcher *w;
2983 2984
	int intf_num = intf->intf_num;
	ipmi_user_t user;
L
Linus Torvalds 已提交
2985

2986
	mutex_lock(&smi_watchers_mutex);
2987
	mutex_lock(&ipmi_interfaces_mutex);
2988
	intf->intf_num = -1;
2989
	intf->in_shutdown = true;
2990 2991 2992
	list_del_rcu(&intf->link);
	mutex_unlock(&ipmi_interfaces_mutex);
	synchronize_rcu();
L
Linus Torvalds 已提交
2993

2994 2995
	cleanup_smi_msgs(intf);

2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007
	/* Clean up the effects of users on the lower-level software. */
	mutex_lock(&ipmi_interfaces_mutex);
	rcu_read_lock();
	list_for_each_entry_rcu(user, &intf->users, link) {
		module_put(intf->handlers->owner);
		if (intf->handlers->dec_usecount)
			intf->handlers->dec_usecount(intf->send_info);
	}
	rcu_read_unlock();
	intf->handlers = NULL;
	mutex_unlock(&ipmi_interfaces_mutex);

3008
	remove_proc_entries(intf);
3009
	ipmi_bmc_unregister(intf);
L
Linus Torvalds 已提交
3010

3011 3012 3013 3014
	/*
	 * Call all the watcher interfaces to tell them that
	 * an interface is gone.
	 */
3015
	list_for_each_entry(w, &smi_watchers, link)
3016 3017
		w->smi_gone(intf_num);
	mutex_unlock(&smi_watchers_mutex);
3018 3019

	kref_put(&intf->refcount, intf_free);
L
Linus Torvalds 已提交
3020 3021
	return 0;
}
3022
EXPORT_SYMBOL(ipmi_unregister_smi);
L
Linus Torvalds 已提交
3023 3024 3025 3026 3027 3028 3029

static int handle_ipmb_get_msg_rsp(ipmi_smi_t          intf,
				   struct ipmi_smi_msg *msg)
{
	struct ipmi_ipmb_addr ipmb_addr;
	struct ipmi_recv_msg  *recv_msg;

3030 3031 3032 3033
	/*
	 * This is 11, not 10, because the response must contain a
	 * completion code.
	 */
L
Linus Torvalds 已提交
3034 3035
	if (msg->rsp_size < 11) {
		/* Message not big enough, just ignore it. */
3036
		ipmi_inc_stat(intf, invalid_ipmb_responses);
L
Linus Torvalds 已提交
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049
		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;

3050 3051 3052 3053
	/*
	 * It's a response from a remote entity.  Look up the sequence
	 * number and handle the response.
	 */
L
Linus Torvalds 已提交
3054 3055 3056 3057 3058 3059
	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),
3060 3061 3062 3063 3064
			  &recv_msg)) {
		/*
		 * We were unable to find the sequence number,
		 * so just nuke the message.
		 */
3065
		ipmi_inc_stat(intf, unhandled_ipmb_responses);
L
Linus Torvalds 已提交
3066 3067 3068 3069 3070 3071
		return 0;
	}

	memcpy(recv_msg->msg_data,
	       &(msg->rsp[9]),
	       msg->rsp_size - 9);
3072 3073 3074 3075 3076
	/*
	 * 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.
	 */
L
Linus Torvalds 已提交
3077 3078 3079 3080
	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;
3081
	ipmi_inc_stat(intf, handled_ipmb_responses);
L
Linus Torvalds 已提交
3082 3083 3084 3085 3086 3087 3088 3089
	deliver_response(recv_msg);

	return 0;
}

static int handle_ipmb_get_msg_cmd(ipmi_smi_t          intf,
				   struct ipmi_smi_msg *msg)
{
3090 3091 3092 3093
	struct cmd_rcvr          *rcvr;
	int                      rv = 0;
	unsigned char            netfn;
	unsigned char            cmd;
3094
	unsigned char            chan;
3095 3096 3097
	ipmi_user_t              user = NULL;
	struct ipmi_ipmb_addr    *ipmb_addr;
	struct ipmi_recv_msg     *recv_msg;
L
Linus Torvalds 已提交
3098 3099 3100

	if (msg->rsp_size < 10) {
		/* Message not big enough, just ignore it. */
3101
		ipmi_inc_stat(intf, invalid_commands);
L
Linus Torvalds 已提交
3102 3103 3104 3105 3106 3107 3108 3109 3110 3111
		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];
3112
	chan = msg->rsp[3] & 0xf;
L
Linus Torvalds 已提交
3113

3114
	rcu_read_lock();
3115
	rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
3116 3117 3118 3119 3120
	if (rcvr) {
		user = rcvr->user;
		kref_get(&user->refcount);
	} else
		user = NULL;
3121
	rcu_read_unlock();
L
Linus Torvalds 已提交
3122 3123 3124

	if (user == NULL) {
		/* We didn't find a user, deliver an error response. */
3125
		ipmi_inc_stat(intf, unhandled_commands);
L
Linus Torvalds 已提交
3126 3127 3128 3129 3130

		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];
3131
		msg->data[4] = ((netfn + 1) << 2) | (msg->rsp[7] & 0x3);
L
Linus Torvalds 已提交
3132
		msg->data[5] = ipmb_checksum(&(msg->data[3]), 2);
3133
		msg->data[6] = intf->channels[msg->rsp[3] & 0xf].address;
3134 3135
		/* rqseq/lun */
		msg->data[7] = (msg->rsp[7] & 0xfc) | (msg->rsp[4] & 0x3);
L
Linus Torvalds 已提交
3136 3137 3138 3139 3140 3141 3142 3143 3144
		msg->data[8] = msg->rsp[8]; /* cmd */
		msg->data[9] = IPMI_INVALID_CMD_COMPLETION_CODE;
		msg->data[10] = ipmb_checksum(&(msg->data[6]), 4);
		msg->data_size = 11;

#ifdef DEBUG_MSGING
	{
		int m;
		printk("Invalid command:");
C
Corey Minyard 已提交
3145
		for (m = 0; m < msg->data_size; m++)
L
Linus Torvalds 已提交
3146 3147 3148 3149
			printk(" %2.2x", msg->data[m]);
		printk("\n");
	}
#endif
3150
		rcu_read_lock();
3151 3152
		if (!intf->in_shutdown) {
			smi_send(intf, intf->handlers, msg, 0);
3153 3154 3155 3156 3157
			/*
			 * We used the message, so return the value
			 * that causes it to not be freed or
			 * queued.
			 */
3158 3159 3160
			rv = -1;
		}
		rcu_read_unlock();
L
Linus Torvalds 已提交
3161 3162
	} else {
		/* Deliver the message to the user. */
3163
		ipmi_inc_stat(intf, handled_commands);
L
Linus Torvalds 已提交
3164 3165

		recv_msg = ipmi_alloc_recv_msg();
3166
		if (!recv_msg) {
3167 3168 3169 3170 3171
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling
			 * later.
			 */
L
Linus Torvalds 已提交
3172
			rv = 1;
3173
			kref_put(&user->refcount, free_user);
L
Linus Torvalds 已提交
3174 3175 3176 3177 3178 3179 3180 3181
		} 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;

3182 3183 3184 3185
			/*
			 * Extract the rest of the message information
			 * from the IPMB header.
			 */
L
Linus Torvalds 已提交
3186 3187 3188 3189 3190 3191 3192
			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;

3193 3194 3195 3196
			/*
			 * We chop off 10, not 9 bytes because the checksum
			 * at the end also needs to be removed.
			 */
L
Linus Torvalds 已提交
3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214
			recv_msg->msg.data_len = msg->rsp_size - 10;
			memcpy(recv_msg->msg_data,
			       &(msg->rsp[9]),
			       msg->rsp_size - 10);
			deliver_response(recv_msg);
		}
	}

	return rv;
}

static int handle_lan_get_msg_rsp(ipmi_smi_t          intf,
				  struct ipmi_smi_msg *msg)
{
	struct ipmi_lan_addr  lan_addr;
	struct ipmi_recv_msg  *recv_msg;


3215 3216 3217 3218
	/*
	 * This is 13, not 12, because the response must contain a
	 * completion code.
	 */
L
Linus Torvalds 已提交
3219 3220
	if (msg->rsp_size < 13) {
		/* Message not big enough, just ignore it. */
3221
		ipmi_inc_stat(intf, invalid_lan_responses);
L
Linus Torvalds 已提交
3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237
		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;

3238 3239 3240 3241
	/*
	 * It's a response from a remote entity.  Look up the sequence
	 * number and handle the response.
	 */
L
Linus Torvalds 已提交
3242 3243 3244 3245 3246 3247
	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),
3248 3249 3250 3251 3252
			  &recv_msg)) {
		/*
		 * We were unable to find the sequence number,
		 * so just nuke the message.
		 */
3253
		ipmi_inc_stat(intf, unhandled_lan_responses);
L
Linus Torvalds 已提交
3254 3255 3256 3257 3258 3259
		return 0;
	}

	memcpy(recv_msg->msg_data,
	       &(msg->rsp[11]),
	       msg->rsp_size - 11);
3260 3261 3262 3263 3264
	/*
	 * 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.
	 */
L
Linus Torvalds 已提交
3265 3266 3267 3268
	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;
3269
	ipmi_inc_stat(intf, handled_lan_responses);
L
Linus Torvalds 已提交
3270 3271 3272 3273 3274 3275 3276 3277
	deliver_response(recv_msg);

	return 0;
}

static int handle_lan_get_msg_cmd(ipmi_smi_t          intf,
				  struct ipmi_smi_msg *msg)
{
3278 3279 3280 3281
	struct cmd_rcvr          *rcvr;
	int                      rv = 0;
	unsigned char            netfn;
	unsigned char            cmd;
3282
	unsigned char            chan;
3283 3284 3285
	ipmi_user_t              user = NULL;
	struct ipmi_lan_addr     *lan_addr;
	struct ipmi_recv_msg     *recv_msg;
L
Linus Torvalds 已提交
3286 3287 3288

	if (msg->rsp_size < 12) {
		/* Message not big enough, just ignore it. */
3289
		ipmi_inc_stat(intf, invalid_commands);
L
Linus Torvalds 已提交
3290 3291 3292 3293 3294 3295 3296 3297 3298 3299
		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];
3300
	chan = msg->rsp[3] & 0xf;
L
Linus Torvalds 已提交
3301

3302
	rcu_read_lock();
3303
	rcvr = find_cmd_rcvr(intf, netfn, cmd, chan);
3304 3305 3306 3307 3308
	if (rcvr) {
		user = rcvr->user;
		kref_get(&user->refcount);
	} else
		user = NULL;
3309
	rcu_read_unlock();
L
Linus Torvalds 已提交
3310 3311

	if (user == NULL) {
3312
		/* We didn't find a user, just give up. */
3313
		ipmi_inc_stat(intf, unhandled_commands);
L
Linus Torvalds 已提交
3314

3315 3316 3317 3318 3319
		/*
		 * Don't do anything with these messages, just allow
		 * them to be freed.
		 */
		rv = 0;
L
Linus Torvalds 已提交
3320 3321
	} else {
		/* Deliver the message to the user. */
3322
		ipmi_inc_stat(intf, handled_commands);
L
Linus Torvalds 已提交
3323 3324

		recv_msg = ipmi_alloc_recv_msg();
3325
		if (!recv_msg) {
3326 3327 3328 3329
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling later.
			 */
L
Linus Torvalds 已提交
3330
			rv = 1;
3331
			kref_put(&user->refcount, free_user);
L
Linus Torvalds 已提交
3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342
		} 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;

3343 3344 3345 3346
			/*
			 * Extract the rest of the message information
			 * from the IPMB header.
			 */
L
Linus Torvalds 已提交
3347 3348 3349 3350 3351 3352 3353
			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;

3354 3355 3356 3357
			/*
			 * We chop off 12, not 11 bytes because the checksum
			 * at the end also needs to be removed.
			 */
L
Linus Torvalds 已提交
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368
			recv_msg->msg.data_len = msg->rsp_size - 12;
			memcpy(recv_msg->msg_data,
			       &(msg->rsp[11]),
			       msg->rsp_size - 12);
			deliver_response(recv_msg);
		}
	}

	return rv;
}

D
dann frazier 已提交
3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476
/*
 * 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(ipmi_smi_t          intf,
				  struct ipmi_smi_msg *msg)
{
	struct cmd_rcvr       *rcvr;
	int                   rv = 0;
	unsigned char         netfn;
	unsigned char         cmd;
	unsigned char         chan;
	ipmi_user_t           user = NULL;
	struct ipmi_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 {
		/* Deliver the message to the user. */
		ipmi_inc_stat(intf, handled_commands);

		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);
			deliver_response(recv_msg);
		}
	}

	return rv;
}

L
Linus Torvalds 已提交
3477 3478 3479 3480
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;
3481

L
Linus Torvalds 已提交
3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506
	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(ipmi_smi_t          intf,
				 struct ipmi_smi_msg *msg)
{
	struct ipmi_recv_msg *recv_msg, *recv_msg2;
	struct list_head     msgs;
	ipmi_user_t          user;
	int                  rv = 0;
	int                  deliver_count = 0;
	unsigned long        flags;

	if (msg->rsp_size < 19) {
		/* Message is too small to be an IPMB event. */
3507
		ipmi_inc_stat(intf, invalid_events);
L
Linus Torvalds 已提交
3508 3509 3510 3511 3512 3513 3514 3515 3516 3517
		return 0;
	}

	if (msg->rsp[2] != 0) {
		/* An error getting the event, just ignore it. */
		return 0;
	}

	INIT_LIST_HEAD(&msgs);

3518
	spin_lock_irqsave(&intf->events_lock, flags);
L
Linus Torvalds 已提交
3519

3520
	ipmi_inc_stat(intf, events);
L
Linus Torvalds 已提交
3521

3522 3523 3524 3525
	/*
	 * Allocate and fill in one message for every user that is
	 * getting events.
	 */
3526 3527
	rcu_read_lock();
	list_for_each_entry_rcu(user, &intf->users, link) {
3528
		if (!user->gets_events)
L
Linus Torvalds 已提交
3529 3530 3531
			continue;

		recv_msg = ipmi_alloc_recv_msg();
3532
		if (!recv_msg) {
3533
			rcu_read_unlock();
3534 3535
			list_for_each_entry_safe(recv_msg, recv_msg2, &msgs,
						 link) {
L
Linus Torvalds 已提交
3536 3537 3538
				list_del(&recv_msg->link);
				ipmi_free_recv_msg(recv_msg);
			}
3539 3540 3541 3542 3543
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling
			 * later.
			 */
L
Linus Torvalds 已提交
3544 3545 3546 3547 3548 3549 3550 3551
			rv = 1;
			goto out;
		}

		deliver_count++;

		copy_event_into_recv_msg(recv_msg, msg);
		recv_msg->user = user;
3552
		kref_get(&user->refcount);
L
Linus Torvalds 已提交
3553 3554
		list_add_tail(&(recv_msg->link), &msgs);
	}
3555
	rcu_read_unlock();
L
Linus Torvalds 已提交
3556 3557 3558 3559 3560 3561 3562 3563

	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_response(recv_msg);
		}
	} else if (intf->waiting_events_count < MAX_EVENTS_IN_QUEUE) {
3564 3565 3566 3567
		/*
		 * No one to receive the message, put it in queue if there's
		 * not already too many things in the queue.
		 */
L
Linus Torvalds 已提交
3568
		recv_msg = ipmi_alloc_recv_msg();
3569
		if (!recv_msg) {
3570 3571 3572 3573 3574
			/*
			 * We couldn't allocate memory for the
			 * message, so requeue it for handling
			 * later.
			 */
L
Linus Torvalds 已提交
3575 3576 3577 3578 3579 3580
			rv = 1;
			goto out;
		}

		copy_event_into_recv_msg(recv_msg, msg);
		list_add_tail(&(recv_msg->link), &(intf->waiting_events));
3581
		intf->waiting_events_count++;
3582
	} else if (!intf->event_msg_printed) {
3583 3584 3585 3586
		/*
		 * There's too many things in the queue, discard this
		 * message.
		 */
3587 3588 3589
		printk(KERN_WARNING PFX "Event queue full, discarding"
		       " incoming events\n");
		intf->event_msg_printed = 1;
L
Linus Torvalds 已提交
3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601
	}

 out:
	spin_unlock_irqrestore(&(intf->events_lock), flags);

	return rv;
}

static int handle_bmc_rsp(ipmi_smi_t          intf,
			  struct ipmi_smi_msg *msg)
{
	struct ipmi_recv_msg *recv_msg;
3602
	struct ipmi_user     *user;
L
Linus Torvalds 已提交
3603 3604

	recv_msg = (struct ipmi_recv_msg *) msg->user_data;
3605 3606 3607 3608 3609 3610
	if (recv_msg == NULL) {
		printk(KERN_WARNING
		       "IPMI message received with no owner. This\n"
		       "could be because of a malformed message, or\n"
		       "because of a hardware error.  Contact your\n"
		       "hardware vender for assistance\n");
3611 3612
		return 0;
	}
L
Linus Torvalds 已提交
3613

3614
	user = recv_msg->user;
L
Linus Torvalds 已提交
3615
	/* Make sure the user still exists. */
3616
	if (user && !user->valid) {
3617
		/* The user for the message went away, so give up. */
3618
		ipmi_inc_stat(intf, unhandled_local_responses);
L
Linus Torvalds 已提交
3619 3620 3621 3622
		ipmi_free_recv_msg(recv_msg);
	} else {
		struct ipmi_system_interface_addr *smi_addr;

3623
		ipmi_inc_stat(intf, handled_local_responses);
L
Linus Torvalds 已提交
3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643
		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_response(recv_msg);
	}

	return 0;
}

3644
/*
3645
 * Handle a received message.  Return 1 if the message should be requeued,
3646 3647 3648
 * 0 if the message should be freed, or -1 if the message should not
 * be freed or requeued.
 */
3649
static int handle_one_recv_msg(ipmi_smi_t          intf,
L
Linus Torvalds 已提交
3650 3651 3652 3653 3654 3655 3656 3657
			       struct ipmi_smi_msg *msg)
{
	int requeue;
	int chan;

#ifdef DEBUG_MSGING
	int m;
	printk("Recv:");
C
Corey Minyard 已提交
3658
	for (m = 0; m < msg->rsp_size; m++)
L
Linus Torvalds 已提交
3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672
		printk(" %2.2x", msg->rsp[m]);
	printk("\n");
#endif
	if (msg->rsp_size < 2) {
		/* Message is too small to be correct. */
		printk(KERN_WARNING PFX "BMC returned to 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;
3673 3674 3675 3676 3677 3678
	} 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.
		 */
L
Linus Torvalds 已提交
3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692
		printk(KERN_WARNING PFX "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)
3693 3694 3695 3696 3697
	    && (msg->user_data != NULL)) {
		/*
		 * It's a response to a response we sent.  For this we
		 * deliver a send message response to the user.
		 */
3698
		struct ipmi_recv_msg     *recv_msg = msg->user_data;
L
Linus Torvalds 已提交
3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709

		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;

3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721
		if (!recv_msg)
			goto out;

		/* Make sure the user still exists. */
		if (!recv_msg->user || !recv_msg->user->valid)
			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_response(recv_msg);
L
Linus Torvalds 已提交
3722
	} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3723
		   && (msg->rsp[1] == IPMI_GET_MSG_CMD)) {
L
Linus Torvalds 已提交
3724 3725 3726 3727 3728 3729 3730 3731
		/* It's from the receive queue. */
		chan = msg->rsp[3] & 0xf;
		if (chan >= IPMI_MAX_CHANNELS) {
			/* Invalid channel number */
			requeue = 0;
			goto out;
		}

D
dann frazier 已提交
3732
		/*
C
Corey Minyard 已提交
3733 3734 3735 3736 3737
		 * 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.
		 */
D
dann frazier 已提交
3738
		if (intf->curr_channel < IPMI_MAX_CHANNELS) {
C
Corey Minyard 已提交
3739
			requeue = 0; /* Throw the message away */
D
dann frazier 已提交
3740 3741 3742
			goto out;
		}

L
Linus Torvalds 已提交
3743 3744 3745
		switch (intf->channels[chan].medium) {
		case IPMI_CHANNEL_MEDIUM_IPMB:
			if (msg->rsp[4] & 0x04) {
3746 3747 3748 3749
				/*
				 * It's a response, so find the
				 * requesting message and send it up.
				 */
L
Linus Torvalds 已提交
3750 3751
				requeue = handle_ipmb_get_msg_rsp(intf, msg);
			} else {
3752 3753 3754 3755
				/*
				 * It's a command to the SMS from some other
				 * entity.  Handle that.
				 */
L
Linus Torvalds 已提交
3756 3757 3758 3759 3760 3761 3762
				requeue = handle_ipmb_get_msg_cmd(intf, msg);
			}
			break;

		case IPMI_CHANNEL_MEDIUM_8023LAN:
		case IPMI_CHANNEL_MEDIUM_ASYNC:
			if (msg->rsp[6] & 0x04) {
3763 3764 3765 3766
				/*
				 * It's a response, so find the
				 * requesting message and send it up.
				 */
L
Linus Torvalds 已提交
3767 3768
				requeue = handle_lan_get_msg_rsp(intf, msg);
			} else {
3769 3770 3771 3772
				/*
				 * It's a command to the SMS from some other
				 * entity.  Handle that.
				 */
L
Linus Torvalds 已提交
3773 3774 3775 3776 3777
				requeue = handle_lan_get_msg_cmd(intf, msg);
			}
			break;

		default:
D
dann frazier 已提交
3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791
			/* Check for OEM Channels.  Clients had better
			   register for these commands. */
			if ((intf->channels[chan].medium
			     >= IPMI_CHANNEL_MEDIUM_OEM_MIN)
			    && (intf->channels[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;
			}
L
Linus Torvalds 已提交
3792 3793 3794
		}

	} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
3795
		   && (msg->rsp[1] == IPMI_READ_EVENT_MSG_BUFFER_CMD)) {
3796
		/* It's an asynchronous event. */
L
Linus Torvalds 已提交
3797 3798 3799 3800 3801 3802 3803 3804 3805 3806
		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;
}

3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818
/*
 * If there are messages in the queue or pretimeouts, handle them.
 */
static void handle_new_recv_msgs(ipmi_smi_t 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)
3819 3820 3821
		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,
3822
				     struct ipmi_smi_msg, link);
3823
		list_del(&smi_msg->link);
3824
		if (!run_to_completion)
3825 3826
			spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock,
					       flags);
3827 3828
		rv = handle_one_recv_msg(intf, smi_msg);
		if (!run_to_completion)
3829
			spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags);
3830
		if (rv > 0) {
3831 3832
			/*
			 * To preserve message order, quit if we
3833 3834 3835 3836
			 * 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.
3837
			 */
3838
			list_add(&smi_msg->link, &intf->waiting_rcv_msgs);
3839
			break;
3840 3841 3842 3843 3844
		} else {
			if (rv == 0)
				/* Message handled */
				ipmi_free_smi_msg(smi_msg);
			/* If rv < 0, fatal error, del but don't free. */
3845 3846 3847
		}
	}
	if (!run_to_completion)
3848
		spin_unlock_irqrestore(&intf->waiting_rcv_msgs_lock, flags);
3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868

	/*
	 * 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)) {
		ipmi_user_t user;

		rcu_read_lock();
		list_for_each_entry_rcu(user, &intf->users, link) {
			if (user->handler->ipmi_watchdog_pretimeout)
				user->handler->ipmi_watchdog_pretimeout(
					user->handler_data);
		}
		rcu_read_unlock();
	}
}

static void smi_recv_tasklet(unsigned long val)
{
3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900
	unsigned long flags = 0; /* keep us warning-free. */
	ipmi_smi_t intf = (ipmi_smi_t) val;
	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.
	 */
	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)
3901
		intf->handlers->sender(intf->send_info, newmsg);
3902 3903

	handle_new_recv_msgs(intf);
3904 3905
}

L
Linus Torvalds 已提交
3906 3907 3908 3909
/* Handle a new message from the lower layer. */
void ipmi_smi_msg_received(ipmi_smi_t          intf,
			   struct ipmi_smi_msg *msg)
{
3910
	unsigned long flags = 0; /* keep us warning-free. */
3911
	int run_to_completion = intf->run_to_completion;
L
Linus Torvalds 已提交
3912 3913 3914 3915

	if ((msg->data_size >= 2)
	    && (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2))
	    && (msg->data[1] == IPMI_SEND_MSG_CMD)
3916
	    && (msg->user_data == NULL)) {
3917 3918 3919 3920

		if (intf->in_shutdown)
			goto free_msg;

3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933
		/*
		 * 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.
		 */
L
Linus Torvalds 已提交
3934 3935
		if ((msg->rsp_size >= 3) && (msg->rsp[2] != 0)
		    && (msg->rsp[2] != IPMI_NODE_BUSY_ERR)
3936 3937
		    && (msg->rsp[2] != IPMI_LOST_ARBITRATION_ERR)
		    && (msg->rsp[2] != IPMI_BUS_ERR)
3938
		    && (msg->rsp[2] != IPMI_NAK_ON_WRITE_ERR)) {
L
Linus Torvalds 已提交
3939 3940 3941 3942 3943 3944 3945 3946 3947
			int chan = msg->rsp[3] & 0xf;

			/* Got an error sending the message, handle it. */
			if (chan >= IPMI_MAX_CHANNELS)
				; /* This shouldn't happen */
			else if ((intf->channels[chan].medium
				  == IPMI_CHANNEL_MEDIUM_8023LAN)
				 || (intf->channels[chan].medium
				     == IPMI_CHANNEL_MEDIUM_ASYNC))
3948
				ipmi_inc_stat(intf, sent_lan_command_errs);
L
Linus Torvalds 已提交
3949
			else
3950
				ipmi_inc_stat(intf, sent_ipmb_command_errs);
L
Linus Torvalds 已提交
3951
			intf_err_seq(intf, msg->msgid, msg->rsp[2]);
3952
		} else
L
Linus Torvalds 已提交
3953 3954 3955
			/* The message was sent, start the timer. */
			intf_start_seq_timer(intf, msg->msgid);

3956
free_msg:
L
Linus Torvalds 已提交
3957
		ipmi_free_smi_msg(msg);
3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968
	} else {
		/*
		 * 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);
L
Linus Torvalds 已提交
3969 3970
	}

3971
	if (!run_to_completion)
3972
		spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
3973 3974 3975 3976
	/*
	 * We can get an asynchronous event or receive message in addition
	 * to commands we send.
	 */
3977 3978
	if (msg == intf->curr_msg)
		intf->curr_msg = NULL;
3979
	if (!run_to_completion)
3980
		spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
3981

3982 3983 3984 3985
	if (run_to_completion)
		smi_recv_tasklet((unsigned long) intf);
	else
		tasklet_schedule(&intf->recv_tasklet);
L
Linus Torvalds 已提交
3986
}
3987
EXPORT_SYMBOL(ipmi_smi_msg_received);
L
Linus Torvalds 已提交
3988 3989 3990

void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf)
{
3991 3992 3993
	if (intf->in_shutdown)
		return;

3994 3995
	atomic_set(&intf->watchdog_pretimeouts_to_deliver, 1);
	tasklet_schedule(&intf->recv_tasklet);
L
Linus Torvalds 已提交
3996
}
3997
EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout);
L
Linus Torvalds 已提交
3998

C
Corey Minyard 已提交
3999 4000 4001
static struct ipmi_smi_msg *
smi_from_recv_msg(ipmi_smi_t intf, struct ipmi_recv_msg *recv_msg,
		  unsigned char seq, long seqid)
L
Linus Torvalds 已提交
4002
{
C
Corey Minyard 已提交
4003
	struct ipmi_smi_msg *smi_msg = ipmi_alloc_smi_msg();
L
Linus Torvalds 已提交
4004
	if (!smi_msg)
4005 4006 4007 4008
		/*
		 * If we can't allocate the message, then just return, we
		 * get 4 retries, so this should be ok.
		 */
C
Corey Minyard 已提交
4009
		return NULL;
L
Linus Torvalds 已提交
4010 4011 4012 4013

	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);
4014

L
Linus Torvalds 已提交
4015 4016 4017 4018
#ifdef DEBUG_MSGING
	{
		int m;
		printk("Resend: ");
C
Corey Minyard 已提交
4019
		for (m = 0; m < smi_msg->data_size; m++)
L
Linus Torvalds 已提交
4020 4021 4022 4023
			printk(" %2.2x", smi_msg->data[m]);
		printk("\n");
	}
#endif
C
Corey Minyard 已提交
4024
	return smi_msg;
L
Linus Torvalds 已提交
4025 4026
}

4027 4028
static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
			      struct list_head *timeouts, long timeout_period,
4029 4030
			      int slot, unsigned long *flags,
			      unsigned int *waiting_msgs)
4031
{
4032
	struct ipmi_recv_msg     *msg;
4033
	const struct ipmi_smi_handlers *handlers;
4034

4035
	if (intf->in_shutdown)
4036
		return;
4037 4038 4039 4040 4041

	if (!ent->inuse)
		return;

	ent->timeout -= timeout_period;
4042 4043
	if (ent->timeout > 0) {
		(*waiting_msgs)++;
4044
		return;
4045
	}
4046 4047 4048 4049 4050 4051 4052

	if (ent->retries_left == 0) {
		/* The message has used all its retries. */
		ent->inuse = 0;
		msg = ent->recv_msg;
		list_add_tail(&msg->link, timeouts);
		if (ent->broadcast)
4053
			ipmi_inc_stat(intf, timed_out_ipmb_broadcasts);
4054
		else if (is_lan_addr(&ent->recv_msg->addr))
4055
			ipmi_inc_stat(intf, timed_out_lan_commands);
4056
		else
4057
			ipmi_inc_stat(intf, timed_out_ipmb_commands);
4058 4059 4060 4061
	} else {
		struct ipmi_smi_msg *smi_msg;
		/* More retries, send again. */

4062 4063
		(*waiting_msgs)++;

4064 4065 4066 4067
		/*
		 * Start with the max timer, set to normal timer after
		 * the message is sent.
		 */
4068 4069 4070 4071
		ent->timeout = MAX_MSG_TIMEOUT;
		ent->retries_left--;
		smi_msg = smi_from_recv_msg(intf, ent->recv_msg, slot,
					    ent->seqid);
4072 4073 4074 4075 4076 4077 4078
		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);
4079
			return;
4080
		}
4081 4082

		spin_unlock_irqrestore(&intf->seq_lock, *flags);
4083

4084 4085 4086 4087 4088 4089 4090
		/*
		 * 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.
		 */
4091
		handlers = intf->handlers;
4092 4093 4094 4095 4096 4097 4098 4099
		if (handlers) {
			if (is_lan_addr(&ent->recv_msg->addr))
				ipmi_inc_stat(intf,
					      retransmitted_lan_commands);
			else
				ipmi_inc_stat(intf,
					      retransmitted_ipmb_commands);

4100
			smi_send(intf, handlers, smi_msg, 0);
4101
		} else
4102 4103
			ipmi_free_smi_msg(smi_msg);

4104 4105 4106 4107
		spin_lock_irqsave(&intf->seq_lock, *flags);
	}
}

4108
static unsigned int ipmi_timeout_handler(ipmi_smi_t intf, long timeout_period)
L
Linus Torvalds 已提交
4109 4110 4111 4112
{
	struct list_head     timeouts;
	struct ipmi_recv_msg *msg, *msg2;
	unsigned long        flags;
4113
	int                  i;
4114
	unsigned int         waiting_msgs = 0;
L
Linus Torvalds 已提交
4115

4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127
	/*
	 * 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);
	for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
		check_msg_timeout(intf, &(intf->seq_table[i]),
				  &timeouts, timeout_period, i,
				  &flags, &waiting_msgs);
	spin_unlock_irqrestore(&intf->seq_lock, flags);
4128

4129 4130
	list_for_each_entry_safe(msg, msg2, &timeouts, link)
		deliver_err_response(msg, IPMI_TIMEOUT_COMPLETION_CODE);
C
Corey Minyard 已提交
4131

4132 4133 4134 4135 4136 4137 4138 4139 4140 4141
	/*
	 * 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);
C
Corey Minyard 已提交
4142
		if (intf->auto_maintenance_timeout > 0) {
4143 4144 4145 4146
			intf->auto_maintenance_timeout
				-= timeout_period;
			if (!intf->maintenance_mode
			    && (intf->auto_maintenance_timeout <= 0)) {
C
Corey Minyard 已提交
4147
				intf->maintenance_mode_enable = false;
4148
				maintenance_mode_update(intf);
C
Corey Minyard 已提交
4149 4150
			}
		}
4151 4152
		spin_unlock_irqrestore(&intf->maintenance_mode_lock,
				       flags);
L
Linus Torvalds 已提交
4153
	}
4154 4155 4156 4157

	tasklet_schedule(&intf->recv_tasklet);

	return waiting_msgs;
L
Linus Torvalds 已提交
4158 4159
}

4160
static void ipmi_request_event(ipmi_smi_t intf)
L
Linus Torvalds 已提交
4161
{
4162 4163 4164
	/* No event requests when in maintenance mode. */
	if (intf->maintenance_mode_enable)
		return;
C
Corey Minyard 已提交
4165

4166 4167
	if (!intf->in_shutdown)
		intf->handlers->request_events(intf->send_info);
L
Linus Torvalds 已提交
4168 4169 4170 4171
}

static struct timer_list ipmi_timer;

4172
static atomic_t stop_operation;
L
Linus Torvalds 已提交
4173 4174 4175

static void ipmi_timeout(unsigned long data)
{
4176 4177 4178
	ipmi_smi_t intf;
	int nt = 0;

4179
	if (atomic_read(&stop_operation))
L
Linus Torvalds 已提交
4180 4181
		return;

4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195
	rcu_read_lock();
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
		int lnt = 0;

		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;
			}
			lnt++;
		}

		lnt += ipmi_timeout_handler(intf, IPMI_TIMEOUT_TIME);
L
Linus Torvalds 已提交
4196

4197 4198 4199 4200 4201
		lnt = !!lnt;
		if (lnt != intf->last_needs_timer &&
					intf->handlers->set_need_watch)
			intf->handlers->set_need_watch(intf->send_info, lnt);
		intf->last_needs_timer = lnt;
L
Linus Torvalds 已提交
4202

4203 4204 4205 4206 4207 4208
		nt += lnt;
	}
	rcu_read_unlock();

	if (nt)
		mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
L
Linus Torvalds 已提交
4209 4210
}

4211 4212 4213 4214 4215 4216
static void need_waiter(ipmi_smi_t intf)
{
	/* Racy, but worst case we start the timer twice. */
	if (!timer_pending(&ipmi_timer))
		mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
}
L
Linus Torvalds 已提交
4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237

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;
}
4238
EXPORT_SYMBOL(ipmi_alloc_smi_msg);
L
Linus Torvalds 已提交
4239 4240 4241 4242 4243 4244 4245

static void free_recv_msg(struct ipmi_recv_msg *msg)
{
	atomic_dec(&recv_msg_inuse_count);
	kfree(msg);
}

A
Adrian Bunk 已提交
4246
static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void)
L
Linus Torvalds 已提交
4247 4248 4249 4250 4251
{
	struct ipmi_recv_msg *rv;

	rv = kmalloc(sizeof(struct ipmi_recv_msg), GFP_ATOMIC);
	if (rv) {
4252
		rv->user = NULL;
L
Linus Torvalds 已提交
4253 4254 4255 4256 4257 4258
		rv->done = free_recv_msg;
		atomic_inc(&recv_msg_inuse_count);
	}
	return rv;
}

4259 4260 4261 4262 4263 4264
void ipmi_free_recv_msg(struct ipmi_recv_msg *msg)
{
	if (msg->user)
		kref_put(&msg->user->refcount, free_user);
	msg->done(msg);
}
4265
EXPORT_SYMBOL(ipmi_free_recv_msg);
4266

L
Linus Torvalds 已提交
4267 4268
#ifdef CONFIG_IPMI_PANIC_EVENT

4269 4270
static atomic_t panic_done_count = ATOMIC_INIT(0);

L
Linus Torvalds 已提交
4271 4272
static void dummy_smi_done_handler(struct ipmi_smi_msg *msg)
{
4273
	atomic_dec(&panic_done_count);
L
Linus Torvalds 已提交
4274 4275 4276 4277
}

static void dummy_recv_done_handler(struct ipmi_recv_msg *msg)
{
4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308
	atomic_dec(&panic_done_count);
}

/*
 * Inside a panic, send a message and wait for a response.
 */
static void ipmi_panic_request_and_wait(ipmi_smi_t           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->channels[0].address,
			    intf->channels[0].lun,
			    0, 1); /* Don't retry, and don't wait. */
	if (rv)
		atomic_sub(2, &panic_done_count);
4309 4310 4311
	else if (intf->handlers->flush_messages)
		intf->handlers->flush_messages(intf->send_info);

4312 4313
	while (atomic_read(&panic_done_count) != 0)
		ipmi_poll(intf);
L
Linus Torvalds 已提交
4314 4315 4316
}

#ifdef CONFIG_IPMI_PANIC_STRING
4317
static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
L
Linus Torvalds 已提交
4318
{
4319 4320 4321
	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)
4322
	    && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
L
Linus Torvalds 已提交
4323
		/* A get event receiver command, save it. */
4324 4325
		intf->event_receiver = msg->msg.data[1];
		intf->event_receiver_lun = msg->msg.data[2] & 0x3;
L
Linus Torvalds 已提交
4326 4327 4328
	}
}

4329
static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
L
Linus Torvalds 已提交
4330
{
4331 4332 4333
	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)
4334 4335 4336 4337 4338
	    && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) {
		/*
		 * A get device id command, save if we are an event
		 * receiver or generator.
		 */
4339 4340
		intf->local_sel_device = (msg->msg.data[6] >> 2) & 1;
		intf->local_event_generator = (msg->msg.data[6] >> 5) & 1;
L
Linus Torvalds 已提交
4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362
	}
}
#endif

static void send_panic_events(char *str)
{
	struct kernel_ipmi_msg            msg;
	ipmi_smi_t                        intf;
	unsigned char                     data[16];
	struct ipmi_system_interface_addr *si;
	struct ipmi_addr                  addr;

	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;
M
Matt Domsch 已提交
4363
	data[0] = 0x41; /* Kernel generator ID, IPMI table 5-4 */
L
Linus Torvalds 已提交
4364 4365 4366 4367 4368
	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. */

4369 4370 4371 4372
	/*
	 * Put a few breadcrumbs in.  Hopefully later we can add more things
	 * to make the panic events more useful.
	 */
L
Linus Torvalds 已提交
4373 4374 4375 4376 4377 4378 4379
	if (str) {
		data[3] = str[0];
		data[6] = str[1];
		data[7] = str[2];
	}

	/* For every registered interface, send the event. */
4380
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
4381 4382
		if (!intf->handlers)
			/* Interface is not ready. */
L
Linus Torvalds 已提交
4383 4384 4385
			continue;

		/* Send the event announcing the panic. */
4386
		ipmi_panic_request_and_wait(intf, &addr, &msg);
L
Linus Torvalds 已提交
4387 4388 4389
	}

#ifdef CONFIG_IPMI_PANIC_STRING
4390 4391 4392 4393 4394
	/*
	 * On every interface, dump a bunch of OEM event holding the
	 * string.
	 */
	if (!str)
L
Linus Torvalds 已提交
4395 4396
		return;

4397 4398
	/* For every registered interface, send the event. */
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
L
Linus Torvalds 已提交
4399 4400 4401 4402
		char                  *p = str;
		struct ipmi_ipmb_addr *ipmb;
		int                   j;

4403 4404
		if (intf->intf_num == -1)
			/* Interface was not ready yet. */
L
Linus Torvalds 已提交
4405 4406
			continue;

4407 4408 4409 4410 4411 4412 4413 4414
		/*
		 * 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();

4415 4416 4417 4418 4419 4420 4421
		/*
		 * 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.
		 */
L
Linus Torvalds 已提交
4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433

		/* 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;
4434
		ipmi_panic_request_and_wait(intf, &addr, &msg);
L
Linus Torvalds 已提交
4435 4436 4437 4438 4439 4440 4441 4442

		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;
4443
			ipmi_panic_request_and_wait(intf, &addr, &msg);
L
Linus Torvalds 已提交
4444 4445 4446
		}
		intf->null_user_handler = NULL;

4447 4448 4449 4450 4451 4452
		/*
		 * 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)
L
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4453
		    && (intf->event_receiver != 0)
4454 4455 4456 4457 4458
		    && (intf->event_receiver != intf->channels[0].address)) {
			/*
			 * The event receiver is valid, send an IPMB
			 * message.
			 */
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Linus Torvalds 已提交
4459 4460 4461 4462 4463 4464
			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) {
4465 4466 4467 4468 4469
			/*
			 * The event receiver was not valid (or was
			 * me), but I am an SEL device, just dump it
			 * in my SEL.
			 */
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Linus Torvalds 已提交
4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490
			si = (struct ipmi_system_interface_addr *) &addr;
			si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
			si->channel = IPMI_BMC_CHANNEL;
			si->lun = 0;
		} else
			continue; /* 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. */
4491
			data[3] = intf->channels[0].address;
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4492
			data[4] = j++; /* sequence # */
4493 4494 4495 4496
			/*
			 * Always give 11 bytes, so strncpy will fill
			 * it with zeroes for me.
			 */
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4497 4498 4499
			strncpy(data+5, p, 11);
			p += size;

4500
			ipmi_panic_request_and_wait(intf, &addr, &msg);
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4501
		}
4502
	}
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4503 4504 4505 4506
#endif /* CONFIG_IPMI_PANIC_STRING */
}
#endif /* CONFIG_IPMI_PANIC_EVENT */

R
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4507
static int has_panicked;
L
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4508 4509 4510

static int panic_event(struct notifier_block *this,
		       unsigned long         event,
4511
		       void                  *ptr)
L
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4512 4513 4514
{
	ipmi_smi_t intf;

L
Lee Revell 已提交
4515
	if (has_panicked)
L
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4516
		return NOTIFY_DONE;
L
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4517
	has_panicked = 1;
L
Linus Torvalds 已提交
4518 4519

	/* For every registered interface, set it to run to completion. */
4520
	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
4521 4522
		if (!intf->handlers)
			/* Interface is not ready. */
L
Linus Torvalds 已提交
4523 4524
			continue;

4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541
		/*
		 * 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);

4542
		intf->run_to_completion = 1;
L
Linus Torvalds 已提交
4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560
		intf->handlers->set_run_to_completion(intf->send_info, 1);
	}

#ifdef CONFIG_IPMI_PANIC_EVENT
	send_panic_events(ptr);
#endif

	return NOTIFY_DONE;
}

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)
{
4561
	int rv;
L
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4562 4563 4564 4565

	if (initialized)
		return 0;

4566
	rv = driver_register(&ipmidriver.driver);
4567 4568 4569 4570 4571
	if (rv) {
		printk(KERN_ERR PFX "Could not register IPMI driver\n");
		return rv;
	}

L
Linus Torvalds 已提交
4572
	printk(KERN_INFO "ipmi message handler version "
4573
	       IPMI_DRIVER_VERSION "\n");
L
Linus Torvalds 已提交
4574

4575
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
4576 4577 4578
	proc_ipmi_root = proc_mkdir("ipmi", NULL);
	if (!proc_ipmi_root) {
	    printk(KERN_ERR PFX "Unable to create IPMI proc dir");
4579
	    driver_unregister(&ipmidriver.driver);
L
Linus Torvalds 已提交
4580 4581 4582
	    return -ENOMEM;
	}

4583
#endif /* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
4584

4585 4586
	setup_timer(&ipmi_timer, ipmi_timeout, 0);
	mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
L
Linus Torvalds 已提交
4587

4588
	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
L
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4589 4590 4591 4592 4593 4594

	initialized = 1;

	return 0;
}

4595
static int __init ipmi_init_msghandler_mod(void)
L
Linus Torvalds 已提交
4596 4597 4598 4599 4600
{
	ipmi_init_msghandler();
	return 0;
}

4601
static void __exit cleanup_ipmi(void)
L
Linus Torvalds 已提交
4602 4603 4604 4605 4606 4607
{
	int count;

	if (!initialized)
		return;

4608
	atomic_notifier_chain_unregister(&panic_notifier_list, &panic_block);
L
Linus Torvalds 已提交
4609

4610 4611 4612 4613
	/*
	 * This can't be called if any interfaces exist, so no worry
	 * about shutting down the interfaces.
	 */
L
Linus Torvalds 已提交
4614

4615 4616 4617 4618 4619
	/*
	 * Tell the timer to stop, then wait for it to stop.  This
	 * avoids problems with race conditions removing the timer
	 * here.
	 */
4620 4621
	atomic_inc(&stop_operation);
	del_timer_sync(&ipmi_timer);
L
Linus Torvalds 已提交
4622

4623
#ifdef CONFIG_PROC_FS
4624
	proc_remove(proc_ipmi_root);
4625
#endif /* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
4626

4627
	driver_unregister(&ipmidriver.driver);
4628

L
Linus Torvalds 已提交
4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644
	initialized = 0;

	/* Check for buffer leaks. */
	count = atomic_read(&smi_msg_inuse_count);
	if (count != 0)
		printk(KERN_WARNING PFX "SMI message count %d at exit\n",
		       count);
	count = atomic_read(&recv_msg_inuse_count);
	if (count != 0)
		printk(KERN_WARNING PFX "recv message count %d at exit\n",
		       count);
}
module_exit(cleanup_ipmi);

module_init(ipmi_init_msghandler_mod);
MODULE_LICENSE("GPL");
4645
MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
4646 4647
MODULE_DESCRIPTION("Incoming and outgoing message routing for an IPMI"
		   " interface.");
4648
MODULE_VERSION(IPMI_DRIVER_VERSION);
4649
MODULE_SOFTDEP("post: ipmi_devintf");