| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * ipmi_msghandler.c |
| * |
| * Incoming and outgoing message routing for an IPMI interface. |
| * |
| * Author: MontaVista Software, Inc. |
| * Corey Minyard <minyard@mvista.com> |
| * source@mvista.com |
| * |
| * Copyright 2002 MontaVista Software Inc. |
| */ |
| |
| #define pr_fmt(fmt) "%s" fmt, "IPMI message handler: " |
| #define dev_fmt pr_fmt |
| |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/panic_notifier.h> |
| #include <linux/poll.h> |
| #include <linux/sched.h> |
| #include <linux/seq_file.h> |
| #include <linux/spinlock.h> |
| #include <linux/mutex.h> |
| #include <linux/slab.h> |
| #include <linux/ipmi.h> |
| #include <linux/ipmi_smi.h> |
| #include <linux/notifier.h> |
| #include <linux/init.h> |
| #include <linux/proc_fs.h> |
| #include <linux/rcupdate.h> |
| #include <linux/interrupt.h> |
| #include <linux/moduleparam.h> |
| #include <linux/workqueue.h> |
| #include <linux/uuid.h> |
| #include <linux/nospec.h> |
| #include <linux/vmalloc.h> |
| #include <linux/delay.h> |
| |
| #define IPMI_DRIVER_VERSION "39.2" |
| |
| static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void); |
| static int ipmi_init_msghandler(void); |
| static void smi_recv_tasklet(struct tasklet_struct *t); |
| static void handle_new_recv_msgs(struct ipmi_smi *intf); |
| static void need_waiter(struct ipmi_smi *intf); |
| static int handle_one_recv_msg(struct ipmi_smi *intf, |
| struct ipmi_smi_msg *msg); |
| |
| static bool initialized; |
| static bool drvregistered; |
| |
| /* Numbers in this enumerator should be mapped to ipmi_panic_event_str */ |
| enum ipmi_panic_event_op { |
| IPMI_SEND_PANIC_EVENT_NONE, |
| IPMI_SEND_PANIC_EVENT, |
| IPMI_SEND_PANIC_EVENT_STRING, |
| IPMI_SEND_PANIC_EVENT_MAX |
| }; |
| |
| /* Indices in this array should be mapped to enum ipmi_panic_event_op */ |
| static const char *const ipmi_panic_event_str[] = { "none", "event", "string", NULL }; |
| |
| #ifdef CONFIG_IPMI_PANIC_STRING |
| #define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT_STRING |
| #elif defined(CONFIG_IPMI_PANIC_EVENT) |
| #define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT |
| #else |
| #define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT_NONE |
| #endif |
| |
| static enum ipmi_panic_event_op ipmi_send_panic_event = IPMI_PANIC_DEFAULT; |
| |
| static int panic_op_write_handler(const char *val, |
| const struct kernel_param *kp) |
| { |
| char valcp[16]; |
| int e; |
| |
| strscpy(valcp, val, sizeof(valcp)); |
| e = match_string(ipmi_panic_event_str, -1, strstrip(valcp)); |
| if (e < 0) |
| return e; |
| |
| ipmi_send_panic_event = e; |
| return 0; |
| } |
| |
| static int panic_op_read_handler(char *buffer, const struct kernel_param *kp) |
| { |
| const char *event_str; |
| |
| if (ipmi_send_panic_event >= IPMI_SEND_PANIC_EVENT_MAX) |
| event_str = "???"; |
| else |
| event_str = ipmi_panic_event_str[ipmi_send_panic_event]; |
| |
| return sprintf(buffer, "%s\n", event_str); |
| } |
| |
| static const struct kernel_param_ops panic_op_ops = { |
| .set = panic_op_write_handler, |
| .get = panic_op_read_handler |
| }; |
| module_param_cb(panic_op, &panic_op_ops, NULL, 0600); |
| MODULE_PARM_DESC(panic_op, "Sets if the IPMI driver will attempt to store panic information in the event log in the event of a panic. Set to 'none' for no, 'event' for a single event, or 'string' for a generic event and the panic string in IPMI OEM events."); |
| |
| |
| #define MAX_EVENTS_IN_QUEUE 25 |
| |
| /* Remain in auto-maintenance mode for this amount of time (in ms). */ |
| static unsigned long maintenance_mode_timeout_ms = 30000; |
| module_param(maintenance_mode_timeout_ms, ulong, 0644); |
| MODULE_PARM_DESC(maintenance_mode_timeout_ms, |
| "The time (milliseconds) after the last maintenance message that the connection stays in maintenance mode."); |
| |
| /* |
| * Don't let a message sit in a queue forever, always time it with at lest |
| * the max message timer. This is in milliseconds. |
| */ |
| #define MAX_MSG_TIMEOUT 60000 |
| |
| /* |
| * Timeout times below are in milliseconds, and are done off a 1 |
| * second timer. So setting the value to 1000 would mean anything |
| * between 0 and 1000ms. So really the only reasonable minimum |
| * setting it 2000ms, which is between 1 and 2 seconds. |
| */ |
| |
| /* The default timeout for message retries. */ |
| static unsigned long default_retry_ms = 2000; |
| module_param(default_retry_ms, ulong, 0644); |
| MODULE_PARM_DESC(default_retry_ms, |
| "The time (milliseconds) between retry sends"); |
| |
| /* The default timeout for maintenance mode message retries. */ |
| static unsigned long default_maintenance_retry_ms = 3000; |
| module_param(default_maintenance_retry_ms, ulong, 0644); |
| MODULE_PARM_DESC(default_maintenance_retry_ms, |
| "The time (milliseconds) between retry sends in maintenance mode"); |
| |
| /* The default maximum number of retries */ |
| static unsigned int default_max_retries = 4; |
| module_param(default_max_retries, uint, 0644); |
| MODULE_PARM_DESC(default_max_retries, |
| "The time (milliseconds) between retry sends in maintenance mode"); |
| |
| /* Call every ~1000 ms. */ |
| #define IPMI_TIMEOUT_TIME 1000 |
| |
| /* How many jiffies does it take to get to the timeout time. */ |
| #define IPMI_TIMEOUT_JIFFIES ((IPMI_TIMEOUT_TIME * HZ) / 1000) |
| |
| /* |
| * Request events from the queue every second (this is the number of |
| * IPMI_TIMEOUT_TIMES between event requests). Hopefully, in the |
| * future, IPMI will add a way to know immediately if an event is in |
| * the queue and this silliness can go away. |
| */ |
| #define IPMI_REQUEST_EV_TIME (1000 / (IPMI_TIMEOUT_TIME)) |
| |
| /* How long should we cache dynamic device IDs? */ |
| #define IPMI_DYN_DEV_ID_EXPIRY (10 * HZ) |
| |
| /* |
| * The main "user" data structure. |
| */ |
| struct ipmi_user { |
| struct list_head link; |
| |
| /* |
| * Set to NULL when the user is destroyed, a pointer to myself |
| * so srcu_dereference can be used on it. |
| */ |
| struct ipmi_user *self; |
| struct srcu_struct release_barrier; |
| |
| struct kref refcount; |
| |
| /* The upper layer that handles receive messages. */ |
| const struct ipmi_user_hndl *handler; |
| void *handler_data; |
| |
| /* The interface this user is bound to. */ |
| struct ipmi_smi *intf; |
| |
| /* Does this interface receive IPMI events? */ |
| bool gets_events; |
| |
| /* Free must run in process context for RCU cleanup. */ |
| struct work_struct remove_work; |
| }; |
| |
| static struct ipmi_user *acquire_ipmi_user(struct ipmi_user *user, int *index) |
| __acquires(user->release_barrier) |
| { |
| struct ipmi_user *ruser; |
| |
| *index = srcu_read_lock(&user->release_barrier); |
| ruser = srcu_dereference(user->self, &user->release_barrier); |
| if (!ruser) |
| srcu_read_unlock(&user->release_barrier, *index); |
| return ruser; |
| } |
| |
| static void release_ipmi_user(struct ipmi_user *user, int index) |
| { |
| srcu_read_unlock(&user->release_barrier, index); |
| } |
| |
| struct cmd_rcvr { |
| struct list_head link; |
| |
| struct ipmi_user *user; |
| unsigned char netfn; |
| unsigned char cmd; |
| unsigned int chans; |
| |
| /* |
| * This is used to form a linked lised during mass deletion. |
| * Since this is in an RCU list, we cannot use the link above |
| * or change any data until the RCU period completes. So we |
| * use this next variable during mass deletion so we can have |
| * a list and don't have to wait and restart the search on |
| * every individual deletion of a command. |
| */ |
| struct cmd_rcvr *next; |
| }; |
| |
| struct seq_table { |
| unsigned int inuse : 1; |
| unsigned int broadcast : 1; |
| |
| unsigned long timeout; |
| unsigned long orig_timeout; |
| unsigned int retries_left; |
| |
| /* |
| * To verify on an incoming send message response that this is |
| * the message that the response is for, we keep a sequence id |
| * and increment it every time we send a message. |
| */ |
| long seqid; |
| |
| /* |
| * This is held so we can properly respond to the message on a |
| * timeout, and it is used to hold the temporary data for |
| * retransmission, too. |
| */ |
| struct ipmi_recv_msg *recv_msg; |
| }; |
| |
| /* |
| * Store the information in a msgid (long) to allow us to find a |
| * sequence table entry from the msgid. |
| */ |
| #define STORE_SEQ_IN_MSGID(seq, seqid) \ |
| ((((seq) & 0x3f) << 26) | ((seqid) & 0x3ffffff)) |
| |
| #define GET_SEQ_FROM_MSGID(msgid, seq, seqid) \ |
| do { \ |
| seq = (((msgid) >> 26) & 0x3f); \ |
| seqid = ((msgid) & 0x3ffffff); \ |
| } while (0) |
| |
| #define NEXT_SEQID(seqid) (((seqid) + 1) & 0x3ffffff) |
| |
| #define IPMI_MAX_CHANNELS 16 |
| struct ipmi_channel { |
| unsigned char medium; |
| unsigned char protocol; |
| }; |
| |
| struct ipmi_channel_set { |
| struct ipmi_channel c[IPMI_MAX_CHANNELS]; |
| }; |
| |
| struct ipmi_my_addrinfo { |
| /* |
| * My slave address. This is initialized to IPMI_BMC_SLAVE_ADDR, |
| * but may be changed by the user. |
| */ |
| unsigned char address; |
| |
| /* |
| * My LUN. This should generally stay the SMS LUN, but just in |
| * case... |
| */ |
| unsigned char lun; |
| }; |
| |
| /* |
| * Note that the product id, manufacturer id, guid, and device id are |
| * immutable in this structure, so dyn_mutex is not required for |
| * accessing those. If those change on a BMC, a new BMC is allocated. |
| */ |
| struct bmc_device { |
| struct platform_device pdev; |
| struct list_head intfs; /* Interfaces on this BMC. */ |
| struct ipmi_device_id id; |
| struct ipmi_device_id fetch_id; |
| int dyn_id_set; |
| unsigned long dyn_id_expiry; |
| struct mutex dyn_mutex; /* Protects id, intfs, & dyn* */ |
| guid_t guid; |
| guid_t fetch_guid; |
| int dyn_guid_set; |
| struct kref usecount; |
| struct work_struct remove_work; |
| unsigned char cc; /* completion code */ |
| }; |
| #define to_bmc_device(x) container_of((x), struct bmc_device, pdev.dev) |
| |
| static int bmc_get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc, |
| struct ipmi_device_id *id, |
| bool *guid_set, guid_t *guid); |
| |
| /* |
| * Various statistics for IPMI, these index stats[] in the ipmi_smi |
| * structure. |
| */ |
| enum ipmi_stat_indexes { |
| /* Commands we got from the user that were invalid. */ |
| IPMI_STAT_sent_invalid_commands = 0, |
| |
| /* Commands we sent to the MC. */ |
| IPMI_STAT_sent_local_commands, |
| |
| /* Responses from the MC that were delivered to a user. */ |
| IPMI_STAT_handled_local_responses, |
| |
| /* Responses from the MC that were not delivered to a user. */ |
| IPMI_STAT_unhandled_local_responses, |
| |
| /* Commands we sent out to the IPMB bus. */ |
| IPMI_STAT_sent_ipmb_commands, |
| |
| /* Commands sent on the IPMB that had errors on the SEND CMD */ |
| IPMI_STAT_sent_ipmb_command_errs, |
| |
| /* Each retransmit increments this count. */ |
| IPMI_STAT_retransmitted_ipmb_commands, |
| |
| /* |
| * When a message times out (runs out of retransmits) this is |
| * incremented. |
| */ |
| IPMI_STAT_timed_out_ipmb_commands, |
| |
| /* |
| * This is like above, but for broadcasts. Broadcasts are |
| * *not* included in the above count (they are expected to |
| * time out). |
| */ |
| IPMI_STAT_timed_out_ipmb_broadcasts, |
| |
| /* Responses I have sent to the IPMB bus. */ |
| IPMI_STAT_sent_ipmb_responses, |
| |
| /* The response was delivered to the user. */ |
| IPMI_STAT_handled_ipmb_responses, |
| |
| /* The response had invalid data in it. */ |
| IPMI_STAT_invalid_ipmb_responses, |
| |
| /* The response didn't have anyone waiting for it. */ |
| IPMI_STAT_unhandled_ipmb_responses, |
| |
| /* Commands we sent out to the IPMB bus. */ |
| IPMI_STAT_sent_lan_commands, |
| |
| /* Commands sent on the IPMB that had errors on the SEND CMD */ |
| IPMI_STAT_sent_lan_command_errs, |
| |
| /* Each retransmit increments this count. */ |
| IPMI_STAT_retransmitted_lan_commands, |
| |
| /* |
| * When a message times out (runs out of retransmits) this is |
| * incremented. |
| */ |
| IPMI_STAT_timed_out_lan_commands, |
| |
| /* Responses I have sent to the IPMB bus. */ |
| IPMI_STAT_sent_lan_responses, |
| |
| /* The response was delivered to the user. */ |
| IPMI_STAT_handled_lan_responses, |
| |
| /* The response had invalid data in it. */ |
| IPMI_STAT_invalid_lan_responses, |
| |
| /* The response didn't have anyone waiting for it. */ |
| IPMI_STAT_unhandled_lan_responses, |
| |
| /* The command was delivered to the user. */ |
| IPMI_STAT_handled_commands, |
| |
| /* The command had invalid data in it. */ |
| IPMI_STAT_invalid_commands, |
| |
| /* The command didn't have anyone waiting for it. */ |
| IPMI_STAT_unhandled_commands, |
| |
| /* Invalid data in an event. */ |
| IPMI_STAT_invalid_events, |
| |
| /* Events that were received with the proper format. */ |
| IPMI_STAT_events, |
| |
| /* Retransmissions on IPMB that failed. */ |
| IPMI_STAT_dropped_rexmit_ipmb_commands, |
| |
| /* Retransmissions on LAN that failed. */ |
| IPMI_STAT_dropped_rexmit_lan_commands, |
| |
| /* This *must* remain last, add new values above this. */ |
| IPMI_NUM_STATS |
| }; |
| |
| |
| #define IPMI_IPMB_NUM_SEQ 64 |
| struct ipmi_smi { |
| struct module *owner; |
| |
| /* What interface number are we? */ |
| int intf_num; |
| |
| struct kref refcount; |
| |
| /* Set when the interface is being unregistered. */ |
| bool in_shutdown; |
| |
| /* Used for a list of interfaces. */ |
| struct list_head link; |
| |
| /* |
| * The list of upper layers that are using me. seq_lock write |
| * protects this. Read protection is with srcu. |
| */ |
| struct list_head users; |
| struct srcu_struct users_srcu; |
| |
| /* Used for wake ups at startup. */ |
| wait_queue_head_t waitq; |
| |
| /* |
| * Prevents the interface from being unregistered when the |
| * interface is used by being looked up through the BMC |
| * structure. |
| */ |
| struct mutex bmc_reg_mutex; |
| |
| struct bmc_device tmp_bmc; |
| struct bmc_device *bmc; |
| bool bmc_registered; |
| struct list_head bmc_link; |
| char *my_dev_name; |
| bool in_bmc_register; /* Handle recursive situations. Yuck. */ |
| struct work_struct bmc_reg_work; |
| |
| const struct ipmi_smi_handlers *handlers; |
| void *send_info; |
| |
| /* Driver-model device for the system interface. */ |
| struct device *si_dev; |
| |
| /* |
| * A table of sequence numbers for this interface. We use the |
| * sequence numbers for IPMB messages that go out of the |
| * interface to match them up with their responses. A routine |
| * is called periodically to time the items in this list. |
| */ |
| spinlock_t seq_lock; |
| struct seq_table seq_table[IPMI_IPMB_NUM_SEQ]; |
| int curr_seq; |
| |
| /* |
| * Messages queued for delivery. If delivery fails (out of memory |
| * for instance), They will stay in here to be processed later in a |
| * periodic timer interrupt. The tasklet is for handling received |
| * messages directly from the handler. |
| */ |
| spinlock_t waiting_rcv_msgs_lock; |
| struct list_head waiting_rcv_msgs; |
| atomic_t watchdog_pretimeouts_to_deliver; |
| struct tasklet_struct recv_tasklet; |
| |
| spinlock_t xmit_msgs_lock; |
| struct list_head xmit_msgs; |
| struct ipmi_smi_msg *curr_msg; |
| struct list_head hp_xmit_msgs; |
| |
| /* |
| * The list of command receivers that are registered for commands |
| * on this interface. |
| */ |
| struct mutex cmd_rcvrs_mutex; |
| struct list_head cmd_rcvrs; |
| |
| /* |
| * Events that were queues because no one was there to receive |
| * them. |
| */ |
| spinlock_t events_lock; /* For dealing with event stuff. */ |
| struct list_head waiting_events; |
| unsigned int waiting_events_count; /* How many events in queue? */ |
| char delivering_events; |
| char event_msg_printed; |
| |
| /* How many users are waiting for events? */ |
| atomic_t event_waiters; |
| unsigned int ticks_to_req_ev; |
| |
| spinlock_t watch_lock; /* For dealing with watch stuff below. */ |
| |
| /* How many users are waiting for commands? */ |
| unsigned int command_waiters; |
| |
| /* How many users are waiting for watchdogs? */ |
| unsigned int watchdog_waiters; |
| |
| /* How many users are waiting for message responses? */ |
| unsigned int response_waiters; |
| |
| /* |
| * Tells what the lower layer has last been asked to watch for, |
| * messages and/or watchdogs. Protected by watch_lock. |
| */ |
| unsigned int last_watch_mask; |
| |
| /* |
| * The event receiver for my BMC, only really used at panic |
| * shutdown as a place to store this. |
| */ |
| unsigned char event_receiver; |
| unsigned char event_receiver_lun; |
| unsigned char local_sel_device; |
| unsigned char local_event_generator; |
| |
| /* For handling of maintenance mode. */ |
| int maintenance_mode; |
| bool maintenance_mode_enable; |
| int auto_maintenance_timeout; |
| spinlock_t maintenance_mode_lock; /* Used in a timer... */ |
| |
| /* |
| * If we are doing maintenance on something on IPMB, extend |
| * the timeout time to avoid timeouts writing firmware and |
| * such. |
| */ |
| int ipmb_maintenance_mode_timeout; |
| |
| /* |
| * A cheap hack, if this is non-null and a message to an |
| * interface comes in with a NULL user, call this routine with |
| * it. Note that the message will still be freed by the |
| * caller. This only works on the system interface. |
| * |
| * Protected by bmc_reg_mutex. |
| */ |
| void (*null_user_handler)(struct ipmi_smi *intf, |
| struct ipmi_recv_msg *msg); |
| |
| /* |
| * When we are scanning the channels for an SMI, this will |
| * tell which channel we are scanning. |
| */ |
| int curr_channel; |
| |
| /* Channel information */ |
| struct ipmi_channel_set *channel_list; |
| unsigned int curr_working_cset; /* First index into the following. */ |
| struct ipmi_channel_set wchannels[2]; |
| struct ipmi_my_addrinfo addrinfo[IPMI_MAX_CHANNELS]; |
| bool channels_ready; |
| |
| atomic_t stats[IPMI_NUM_STATS]; |
| |
| /* |
| * run_to_completion duplicate of smb_info, smi_info |
| * and ipmi_serial_info structures. Used to decrease numbers of |
| * parameters passed by "low" level IPMI code. |
| */ |
| int run_to_completion; |
| }; |
| #define to_si_intf_from_dev(device) container_of(device, struct ipmi_smi, dev) |
| |
| static void __get_guid(struct ipmi_smi *intf); |
| static void __ipmi_bmc_unregister(struct ipmi_smi *intf); |
| static int __ipmi_bmc_register(struct ipmi_smi *intf, |
| struct ipmi_device_id *id, |
| bool guid_set, guid_t *guid, int intf_num); |
| static int __scan_channels(struct ipmi_smi *intf, struct ipmi_device_id *id); |
| |
| |
| /** |
| * The driver model view of the IPMI messaging driver. |
| */ |
| static struct platform_driver ipmidriver = { |
| .driver = { |
| .name = "ipmi", |
| .bus = &platform_bus_type |
| } |
| }; |
| /* |
| * This mutex keeps us from adding the same BMC twice. |
| */ |
| static DEFINE_MUTEX(ipmidriver_mutex); |
| |
| static LIST_HEAD(ipmi_interfaces); |
| static DEFINE_MUTEX(ipmi_interfaces_mutex); |
| #define ipmi_interfaces_mutex_held() \ |
| lockdep_is_held(&ipmi_interfaces_mutex) |
| static struct srcu_struct ipmi_interfaces_srcu; |
| |
| /* |
| * List of watchers that want to know when smi's are added and deleted. |
| */ |
| static LIST_HEAD(smi_watchers); |
| static DEFINE_MUTEX(smi_watchers_mutex); |
| |
| #define ipmi_inc_stat(intf, stat) \ |
| atomic_inc(&(intf)->stats[IPMI_STAT_ ## stat]) |
| #define ipmi_get_stat(intf, stat) \ |
| ((unsigned int) atomic_read(&(intf)->stats[IPMI_STAT_ ## stat])) |
| |
| static const char * const addr_src_to_str[] = { |
| "invalid", "hotmod", "hardcoded", "SPMI", "ACPI", "SMBIOS", "PCI", |
| "device-tree", "platform" |
| }; |
| |
| const char *ipmi_addr_src_to_str(enum ipmi_addr_src src) |
| { |
| if (src >= SI_LAST) |
| src = 0; /* Invalid */ |
| return addr_src_to_str[src]; |
| } |
| EXPORT_SYMBOL(ipmi_addr_src_to_str); |
| |
| static int is_lan_addr(struct ipmi_addr *addr) |
| { |
| return addr->addr_type == IPMI_LAN_ADDR_TYPE; |
| } |
| |
| static int is_ipmb_addr(struct ipmi_addr *addr) |
| { |
| return addr->addr_type == IPMI_IPMB_ADDR_TYPE; |
| } |
| |
| static int is_ipmb_bcast_addr(struct ipmi_addr *addr) |
| { |
| return addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE; |
| } |
| |
| static int is_ipmb_direct_addr(struct ipmi_addr *addr) |
| { |
| return addr->addr_type == IPMI_IPMB_DIRECT_ADDR_TYPE; |
| } |
| |
| static void free_recv_msg_list(struct list_head *q) |
| { |
| struct ipmi_recv_msg *msg, *msg2; |
| |
| list_for_each_entry_safe(msg, msg2, q, link) { |
| list_del(&msg->link); |
| ipmi_free_recv_msg(msg); |
| } |
| } |
| |
| static void free_smi_msg_list(struct list_head *q) |
| { |
| struct ipmi_smi_msg *msg, *msg2; |
| |
| list_for_each_entry_safe(msg, msg2, q, link) { |
| list_del(&msg->link); |
| ipmi_free_smi_msg(msg); |
| } |
| } |
| |
| static void clean_up_interface_data(struct ipmi_smi *intf) |
| { |
| int i; |
| struct cmd_rcvr *rcvr, *rcvr2; |
| struct list_head list; |
| |
| tasklet_kill(&intf->recv_tasklet); |
| |
| free_smi_msg_list(&intf->waiting_rcv_msgs); |
| free_recv_msg_list(&intf->waiting_events); |
| |
| /* |
| * Wholesale remove all the entries from the list in the |
| * interface and wait for RCU to know that none are in use. |
| */ |
| mutex_lock(&intf->cmd_rcvrs_mutex); |
| INIT_LIST_HEAD(&list); |
| list_splice_init_rcu(&intf->cmd_rcvrs, &list, synchronize_rcu); |
| mutex_unlock(&intf->cmd_rcvrs_mutex); |
| |
| list_for_each_entry_safe(rcvr, rcvr2, &list, link) |
| kfree(rcvr); |
| |
| for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) { |
| if ((intf->seq_table[i].inuse) |
| && (intf->seq_table[i].recv_msg)) |
| ipmi_free_recv_msg(intf->seq_table[i].recv_msg); |
| } |
| } |
| |
| static void intf_free(struct kref *ref) |
| { |
| struct ipmi_smi *intf = container_of(ref, struct ipmi_smi, refcount); |
| |
| clean_up_interface_data(intf); |
| kfree(intf); |
| } |
| |
| struct watcher_entry { |
| int intf_num; |
| struct ipmi_smi *intf; |
| struct list_head link; |
| }; |
| |
| int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher) |
| { |
| struct ipmi_smi *intf; |
| int index, rv; |
| |
| /* |
| * Make sure the driver is actually initialized, this handles |
| * problems with initialization order. |
| */ |
| rv = ipmi_init_msghandler(); |
| if (rv) |
| return rv; |
| |
| mutex_lock(&smi_watchers_mutex); |
| |
| list_add(&watcher->link, &smi_watchers); |
| |
| index = srcu_read_lock(&ipmi_interfaces_srcu); |
| list_for_each_entry_rcu(intf, &ipmi_interfaces, link, |
| lockdep_is_held(&smi_watchers_mutex)) { |
| int intf_num = READ_ONCE(intf->intf_num); |
| |
| if (intf_num == -1) |
| continue; |
| watcher->new_smi(intf_num, intf->si_dev); |
| } |
| srcu_read_unlock(&ipmi_interfaces_srcu, index); |
| |
| mutex_unlock(&smi_watchers_mutex); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ipmi_smi_watcher_register); |
| |
| int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher) |
| { |
| mutex_lock(&smi_watchers_mutex); |
| list_del(&watcher->link); |
| mutex_unlock(&smi_watchers_mutex); |
| return 0; |
| } |
| EXPORT_SYMBOL(ipmi_smi_watcher_unregister); |
| |
| /* |
| * Must be called with smi_watchers_mutex held. |
| */ |
| static void |
| call_smi_watchers(int i, struct device *dev) |
| { |
| struct ipmi_smi_watcher *w; |
| |
| mutex_lock(&smi_watchers_mutex); |
| list_for_each_entry(w, &smi_watchers, link) { |
| if (try_module_get(w->owner)) { |
| w->new_smi(i, dev); |
| module_put(w->owner); |
| } |
| } |
| mutex_unlock(&smi_watchers_mutex); |
| } |
| |
| static int |
| ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2) |
| { |
| if (addr1->addr_type != addr2->addr_type) |
| return 0; |
| |
| if (addr1->channel != addr2->channel) |
| return 0; |
| |
| if (addr1->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) { |
| struct ipmi_system_interface_addr *smi_addr1 |
| = (struct ipmi_system_interface_addr *) addr1; |
| struct ipmi_system_interface_addr *smi_addr2 |
| = (struct ipmi_system_interface_addr *) addr2; |
| return (smi_addr1->lun == smi_addr2->lun); |
| } |
| |
| if (is_ipmb_addr(addr1) || is_ipmb_bcast_addr(addr1)) { |
| struct ipmi_ipmb_addr *ipmb_addr1 |
| = (struct ipmi_ipmb_addr *) addr1; |
| struct ipmi_ipmb_addr *ipmb_addr2 |
| = (struct ipmi_ipmb_addr *) addr2; |
| |
| return ((ipmb_addr1->slave_addr == ipmb_addr2->slave_addr) |
| && (ipmb_addr1->lun == ipmb_addr2->lun)); |
| } |
| |
| if (is_ipmb_direct_addr(addr1)) { |
| struct ipmi_ipmb_direct_addr *daddr1 |
| = (struct ipmi_ipmb_direct_addr *) addr1; |
| struct ipmi_ipmb_direct_addr *daddr2 |
| = (struct ipmi_ipmb_direct_addr *) addr2; |
| |
| return daddr1->slave_addr == daddr2->slave_addr && |
| daddr1->rq_lun == daddr2->rq_lun && |
| daddr1->rs_lun == daddr2->rs_lun; |
| } |
| |
| if (is_lan_addr(addr1)) { |
| struct ipmi_lan_addr *lan_addr1 |
| = (struct ipmi_lan_addr *) addr1; |
| struct ipmi_lan_addr *lan_addr2 |
| = (struct ipmi_lan_addr *) addr2; |
| |
| return ((lan_addr1->remote_SWID == lan_addr2->remote_SWID) |
| && (lan_addr1->local_SWID == lan_addr2->local_SWID) |
| && (lan_addr1->session_handle |
| == lan_addr2->session_handle) |
| && (lan_addr1->lun == lan_addr2->lun)); |
| } |
| |
| return 1; |
| } |
| |
| int ipmi_validate_addr(struct ipmi_addr *addr, int len) |
| { |
| if (len < sizeof(struct ipmi_system_interface_addr)) |
| return -EINVAL; |
| |
| if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) { |
| if (addr->channel != IPMI_BMC_CHANNEL) |
| return -EINVAL; |
| return 0; |
| } |
| |
| if ((addr->channel == IPMI_BMC_CHANNEL) |
| || (addr->channel >= IPMI_MAX_CHANNELS) |
| || (addr->channel < 0)) |
| return -EINVAL; |
| |
| if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) { |
| if (len < sizeof(struct ipmi_ipmb_addr)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| if (is_ipmb_direct_addr(addr)) { |
| struct ipmi_ipmb_direct_addr *daddr = (void *) addr; |
| |
| if (addr->channel != 0) |
| return -EINVAL; |
| if (len < sizeof(struct ipmi_ipmb_direct_addr)) |
| return -EINVAL; |
| |
| if (daddr->slave_addr & 0x01) |
| return -EINVAL; |
| if (daddr->rq_lun >= 4) |
| return -EINVAL; |
| if (daddr->rs_lun >= 4) |
| return -EINVAL; |
| return 0; |
| } |
| |
| if (is_lan_addr(addr)) { |
| if (len < sizeof(struct ipmi_lan_addr)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| return -EINVAL; |
| } |
| EXPORT_SYMBOL(ipmi_validate_addr); |
| |
| unsigned int ipmi_addr_length(int addr_type) |
| { |
| if (addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) |
| return sizeof(struct ipmi_system_interface_addr); |
| |
| if ((addr_type == IPMI_IPMB_ADDR_TYPE) |
| || (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)) |
| return sizeof(struct ipmi_ipmb_addr); |
| |
| if (addr_type == IPMI_IPMB_DIRECT_ADDR_TYPE) |
| return sizeof(struct ipmi_ipmb_direct_addr); |
| |
| if (addr_type == IPMI_LAN_ADDR_TYPE) |
| return sizeof(struct ipmi_lan_addr); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ipmi_addr_length); |
| |
| static int deliver_response(struct ipmi_smi *intf, struct ipmi_recv_msg *msg) |
| { |
| int rv = 0; |
| |
| if (!msg->user) { |
| /* Special handling for NULL users. */ |
| if (intf->null_user_handler) { |
| intf->null_user_handler(intf, msg); |
| } else { |
| /* No handler, so give up. */ |
| rv = -EINVAL; |
| } |
| ipmi_free_recv_msg(msg); |
| } else if (oops_in_progress) { |
| /* |
| * If we are running in the panic context, calling the |
| * receive handler doesn't much meaning and has a deadlock |
| * risk. At this moment, simply skip it in that case. |
| */ |
| ipmi_free_recv_msg(msg); |
| } else { |
| int index; |
| struct ipmi_user *user = acquire_ipmi_user(msg->user, &index); |
| |
| if (user) { |
| user->handler->ipmi_recv_hndl(msg, user->handler_data); |
| release_ipmi_user(user, index); |
| } else { |
| /* User went away, give up. */ |
| ipmi_free_recv_msg(msg); |
| rv = -EINVAL; |
| } |
| } |
| |
| return rv; |
| } |
| |
| static void deliver_local_response(struct ipmi_smi *intf, |
| struct ipmi_recv_msg *msg) |
| { |
| if (deliver_response(intf, msg)) |
| ipmi_inc_stat(intf, unhandled_local_responses); |
| else |
| ipmi_inc_stat(intf, handled_local_responses); |
| } |
| |
| static void deliver_err_response(struct ipmi_smi *intf, |
| struct ipmi_recv_msg *msg, int err) |
| { |
| msg->recv_type = IPMI_RESPONSE_RECV_TYPE; |
| msg->msg_data[0] = err; |
| msg->msg.netfn |= 1; /* Convert to a response. */ |
| msg->msg.data_len = 1; |
| msg->msg.data = msg->msg_data; |
| deliver_local_response(intf, msg); |
| } |
| |
| static void smi_add_watch(struct ipmi_smi *intf, unsigned int flags) |
| { |
| unsigned long iflags; |
| |
| if (!intf->handlers->set_need_watch) |
| return; |
| |
| spin_lock_irqsave(&intf->watch_lock, iflags); |
| if (flags & IPMI_WATCH_MASK_CHECK_MESSAGES) |
| intf->response_waiters++; |
| |
| if (flags & IPMI_WATCH_MASK_CHECK_WATCHDOG) |
| intf->watchdog_waiters++; |
| |
| if (flags & IPMI_WATCH_MASK_CHECK_COMMANDS) |
| intf->command_waiters++; |
| |
| if ((intf->last_watch_mask & flags) != flags) { |
| intf->last_watch_mask |= flags; |
| intf->handlers->set_need_watch(intf->send_info, |
| intf->last_watch_mask); |
| } |
| spin_unlock_irqrestore(&intf->watch_lock, iflags); |
| } |
| |
| static void smi_remove_watch(struct ipmi_smi *intf, unsigned int flags) |
| { |
| unsigned long iflags; |
| |
| if (!intf->handlers->set_need_watch) |
| return; |
| |
| spin_lock_irqsave(&intf->watch_lock, iflags); |
| if (flags & IPMI_WATCH_MASK_CHECK_MESSAGES) |
| intf->response_waiters--; |
| |
| if (flags & IPMI_WATCH_MASK_CHECK_WATCHDOG) |
| intf->watchdog_waiters--; |
| |
| if (flags & IPMI_WATCH_MASK_CHECK_COMMANDS) |
| intf->command_waiters--; |
| |
| flags = 0; |
| if (intf->response_waiters) |
| flags |= IPMI_WATCH_MASK_CHECK_MESSAGES; |
| if (intf->watchdog_waiters) |
| flags |= IPMI_WATCH_MASK_CHECK_WATCHDOG; |
| if (intf->command_waiters) |
| flags |= IPMI_WATCH_MASK_CHECK_COMMANDS; |
| |
| if (intf->last_watch_mask != flags) { |
| intf->last_watch_mask = flags; |
| intf->handlers->set_need_watch(intf->send_info, |
| intf->last_watch_mask); |
| } |
| spin_unlock_irqrestore(&intf->watch_lock, iflags); |
| } |
| |
| /* |
| * Find the next sequence number not being used and add the given |
| * message with the given timeout to the sequence table. This must be |
| * called with the interface's seq_lock held. |
| */ |
| static int intf_next_seq(struct ipmi_smi *intf, |
| struct ipmi_recv_msg *recv_msg, |
| unsigned long timeout, |
| int retries, |
| int broadcast, |
| unsigned char *seq, |
| long *seqid) |
| { |
| int rv = 0; |
| unsigned int i; |
| |
| if (timeout == 0) |
| timeout = default_retry_ms; |
| if (retries < 0) |
| retries = default_max_retries; |
| |
| for (i = intf->curr_seq; (i+1)%IPMI_IPMB_NUM_SEQ != intf->curr_seq; |
| i = (i+1)%IPMI_IPMB_NUM_SEQ) { |
| if (!intf->seq_table[i].inuse) |
| break; |
| } |
| |
| if (!intf->seq_table[i].inuse) { |
| intf->seq_table[i].recv_msg = recv_msg; |
| |
| /* |
| * Start with the maximum timeout, when the send response |
| * comes in we will start the real timer. |
| */ |
| intf->seq_table[i].timeout = MAX_MSG_TIMEOUT; |
| intf->seq_table[i].orig_timeout = timeout; |
| intf->seq_table[i].retries_left = retries; |
| intf->seq_table[i].broadcast = broadcast; |
| intf->seq_table[i].inuse = 1; |
| intf->seq_table[i].seqid = NEXT_SEQID(intf->seq_table[i].seqid); |
| *seq = i; |
| *seqid = intf->seq_table[i].seqid; |
| intf->curr_seq = (i+1)%IPMI_IPMB_NUM_SEQ; |
| smi_add_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES); |
| need_waiter(intf); |
| } else { |
| rv = -EAGAIN; |
| } |
| |
| return rv; |
| } |
| |
| /* |
| * Return the receive message for the given sequence number and |
| * release the sequence number so it can be reused. Some other data |
| * is passed in to be sure the message matches up correctly (to help |
| * guard against message coming in after their timeout and the |
| * sequence number being reused). |
| */ |
| static int intf_find_seq(struct ipmi_smi *intf, |
| unsigned char seq, |
| short channel, |
| unsigned char cmd, |
| unsigned char netfn, |
| struct ipmi_addr *addr, |
| struct ipmi_recv_msg **recv_msg) |
| { |
| int rv = -ENODEV; |
| unsigned long flags; |
| |
| if (seq >= IPMI_IPMB_NUM_SEQ) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&intf->seq_lock, flags); |
| if (intf->seq_table[seq].inuse) { |
| struct ipmi_recv_msg *msg = intf->seq_table[seq].recv_msg; |
| |
| if ((msg->addr.channel == channel) && (msg->msg.cmd == cmd) |
| && (msg->msg.netfn == netfn) |
| && (ipmi_addr_equal(addr, &msg->addr))) { |
| *recv_msg = msg; |
| intf->seq_table[seq].inuse = 0; |
| smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES); |
| rv = 0; |
| } |
| } |
| spin_unlock_irqrestore(&intf->seq_lock, flags); |
| |
| return rv; |
| } |
| |
| |
| /* Start the timer for a specific sequence table entry. */ |
| static int intf_start_seq_timer(struct ipmi_smi *intf, |
| long msgid) |
| { |
| int rv = -ENODEV; |
| unsigned long flags; |
| unsigned char seq; |
| unsigned long seqid; |
| |
| |
| GET_SEQ_FROM_MSGID(msgid, seq, seqid); |
| |
| spin_lock_irqsave(&intf->seq_lock, flags); |
| /* |
| * We do this verification because the user can be deleted |
| * while a message is outstanding. |
| */ |
| if ((intf->seq_table[seq].inuse) |
| && (intf->seq_table[seq].seqid == seqid)) { |
| struct seq_table *ent = &intf->seq_table[seq]; |
| ent->timeout = ent->orig_timeout; |
| rv = 0; |
| } |
| spin_unlock_irqrestore(&intf->seq_lock, flags); |
| |
| return rv; |
| } |
| |
| /* Got an error for the send message for a specific sequence number. */ |
| static int intf_err_seq(struct ipmi_smi *intf, |
| long msgid, |
| unsigned int err) |
| { |
| int rv = -ENODEV; |
| unsigned long flags; |
| unsigned char seq; |
| unsigned long seqid; |
| struct ipmi_recv_msg *msg = NULL; |
| |
| |
| GET_SEQ_FROM_MSGID(msgid, seq, seqid); |
| |
| spin_lock_irqsave(&intf->seq_lock, flags); |
| /* |
| * We do this verification because the user can be deleted |
| * while a message is outstanding. |
| */ |
| if ((intf->seq_table[seq].inuse) |
| && (intf->seq_table[seq].seqid == seqid)) { |
| struct seq_table *ent = &intf->seq_table[seq]; |
| |
| ent->inuse = 0; |
| smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES); |
| msg = ent->recv_msg; |
| rv = 0; |
| } |
| spin_unlock_irqrestore(&intf->seq_lock, flags); |
| |
| if (msg) |
| deliver_err_response(intf, msg, err); |
| |
| return rv; |
| } |
| |
| static void free_user_work(struct work_struct *work) |
| { |
| struct ipmi_user *user = container_of(work, struct ipmi_user, |
| remove_work); |
| |
| cleanup_srcu_struct(&user->release_barrier); |
| vfree(user); |
| } |
| |
| int ipmi_create_user(unsigned int if_num, |
| const struct ipmi_user_hndl *handler, |
| void *handler_data, |
| struct ipmi_user **user) |
| { |
| unsigned long flags; |
| struct ipmi_user *new_user; |
| int rv, index; |
| struct ipmi_smi *intf; |
| |
| /* |
| * There is no module usecount here, because it's not |
| * required. Since this can only be used by and called from |
| * other modules, they will implicitly use this module, and |
| * thus this can't be removed unless the other modules are |
| * removed. |
| */ |
| |
| if (handler == NULL) |
| return -EINVAL; |
| |
| /* |
| * Make sure the driver is actually initialized, this handles |
| * problems with initialization order. |
| */ |
| rv = ipmi_init_msghandler(); |
| if (rv) |
| return rv; |
| |
| new_user = vzalloc(sizeof(*new_user)); |
| if (!new_user) |
| return -ENOMEM; |
| |
| index = srcu_read_lock(&ipmi_interfaces_srcu); |
| list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { |
| if (intf->intf_num == if_num) |
| goto found; |
| } |
| /* Not found, return an error */ |
| rv = -EINVAL; |
| goto out_kfree; |
| |
| found: |
| INIT_WORK(&new_user->remove_work, free_user_work); |
| |
| rv = init_srcu_struct(&new_user->release_barrier); |
| if (rv) |
| goto out_kfree; |
| |
| if (!try_module_get(intf->owner)) { |
| rv = -ENODEV; |
| goto out_kfree; |
| } |
| |
| /* Note that each existing user holds a refcount to the interface. */ |
| kref_get(&intf->refcount); |
| |
| kref_init(&new_user->refcount); |
| new_user->handler = handler; |
| new_user->handler_data = handler_data; |
| new_user->intf = intf; |
| new_user->gets_events = false; |
| |
| rcu_assign_pointer(new_user->self, new_user); |
| spin_lock_irqsave(&intf->seq_lock, flags); |
| list_add_rcu(&new_user->link, &intf->users); |
| spin_unlock_irqrestore(&intf->seq_lock, flags); |
| if (handler->ipmi_watchdog_pretimeout) |
| /* User wants pretimeouts, so make sure to watch for them. */ |
| smi_add_watch(intf, IPMI_WATCH_MASK_CHECK_WATCHDOG); |
| srcu_read_unlock(&ipmi_interfaces_srcu, index); |
| *user = new_user; |
| return 0; |
| |
| out_kfree: |
| srcu_read_unlock(&ipmi_interfaces_srcu, index); |
| vfree(new_user); |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_create_user); |
| |
| int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data) |
| { |
| int rv, index; |
| struct ipmi_smi *intf; |
| |
| index = srcu_read_lock(&ipmi_interfaces_srcu); |
| list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { |
| if (intf->intf_num == if_num) |
| goto found; |
| } |
| srcu_read_unlock(&ipmi_interfaces_srcu, index); |
| |
| /* Not found, return an error */ |
| return -EINVAL; |
| |
| found: |
| if (!intf->handlers->get_smi_info) |
| rv = -ENOTTY; |
| else |
| rv = intf->handlers->get_smi_info(intf->send_info, data); |
| srcu_read_unlock(&ipmi_interfaces_srcu, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_get_smi_info); |
| |
| static void free_user(struct kref *ref) |
| { |
| struct ipmi_user *user = container_of(ref, struct ipmi_user, refcount); |
| |
| /* SRCU cleanup must happen in task context. */ |
| schedule_work(&user->remove_work); |
| } |
| |
| static void _ipmi_destroy_user(struct ipmi_user *user) |
| { |
| struct ipmi_smi *intf = user->intf; |
| int i; |
| unsigned long flags; |
| struct cmd_rcvr *rcvr; |
| struct cmd_rcvr *rcvrs = NULL; |
| |
| if (!acquire_ipmi_user(user, &i)) { |
| /* |
| * The user has already been cleaned up, just make sure |
| * nothing is using it and return. |
| */ |
| synchronize_srcu(&user->release_barrier); |
| return; |
| } |
| |
| rcu_assign_pointer(user->self, NULL); |
| release_ipmi_user(user, i); |
| |
| synchronize_srcu(&user->release_barrier); |
| |
| if (user->handler->shutdown) |
| user->handler->shutdown(user->handler_data); |
| |
| if (user->handler->ipmi_watchdog_pretimeout) |
| smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_WATCHDOG); |
| |
| if (user->gets_events) |
| atomic_dec(&intf->event_waiters); |
| |
| /* Remove the user from the interface's sequence table. */ |
| spin_lock_irqsave(&intf->seq_lock, flags); |
| list_del_rcu(&user->link); |
| |
| for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) { |
| if (intf->seq_table[i].inuse |
| && (intf->seq_table[i].recv_msg->user == user)) { |
| intf->seq_table[i].inuse = 0; |
| smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_MESSAGES); |
| ipmi_free_recv_msg(intf->seq_table[i].recv_msg); |
| } |
| } |
| spin_unlock_irqrestore(&intf->seq_lock, flags); |
| |
| /* |
| * Remove the user from the command receiver's table. First |
| * we build a list of everything (not using the standard link, |
| * since other things may be using it till we do |
| * synchronize_srcu()) then free everything in that list. |
| */ |
| mutex_lock(&intf->cmd_rcvrs_mutex); |
| list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link, |
| lockdep_is_held(&intf->cmd_rcvrs_mutex)) { |
| if (rcvr->user == user) { |
| list_del_rcu(&rcvr->link); |
| rcvr->next = rcvrs; |
| rcvrs = rcvr; |
| } |
| } |
| mutex_unlock(&intf->cmd_rcvrs_mutex); |
| synchronize_rcu(); |
| while (rcvrs) { |
| rcvr = rcvrs; |
| rcvrs = rcvr->next; |
| kfree(rcvr); |
| } |
| |
| kref_put(&intf->refcount, intf_free); |
| module_put(intf->owner); |
| } |
| |
| int ipmi_destroy_user(struct ipmi_user *user) |
| { |
| _ipmi_destroy_user(user); |
| |
| kref_put(&user->refcount, free_user); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ipmi_destroy_user); |
| |
| int ipmi_get_version(struct ipmi_user *user, |
| unsigned char *major, |
| unsigned char *minor) |
| { |
| struct ipmi_device_id id; |
| int rv, index; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| rv = bmc_get_device_id(user->intf, NULL, &id, NULL, NULL); |
| if (!rv) { |
| *major = ipmi_version_major(&id); |
| *minor = ipmi_version_minor(&id); |
| } |
| release_ipmi_user(user, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_get_version); |
| |
| int ipmi_set_my_address(struct ipmi_user *user, |
| unsigned int channel, |
| unsigned char address) |
| { |
| int index, rv = 0; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| if (channel >= IPMI_MAX_CHANNELS) { |
| rv = -EINVAL; |
| } else { |
| channel = array_index_nospec(channel, IPMI_MAX_CHANNELS); |
| user->intf->addrinfo[channel].address = address; |
| } |
| release_ipmi_user(user, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_set_my_address); |
| |
| int ipmi_get_my_address(struct ipmi_user *user, |
| unsigned int channel, |
| unsigned char *address) |
| { |
| int index, rv = 0; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| if (channel >= IPMI_MAX_CHANNELS) { |
| rv = -EINVAL; |
| } else { |
| channel = array_index_nospec(channel, IPMI_MAX_CHANNELS); |
| *address = user->intf->addrinfo[channel].address; |
| } |
| release_ipmi_user(user, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_get_my_address); |
| |
| int ipmi_set_my_LUN(struct ipmi_user *user, |
| unsigned int channel, |
| unsigned char LUN) |
| { |
| int index, rv = 0; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| if (channel >= IPMI_MAX_CHANNELS) { |
| rv = -EINVAL; |
| } else { |
| channel = array_index_nospec(channel, IPMI_MAX_CHANNELS); |
| user->intf->addrinfo[channel].lun = LUN & 0x3; |
| } |
| release_ipmi_user(user, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_set_my_LUN); |
| |
| int ipmi_get_my_LUN(struct ipmi_user *user, |
| unsigned int channel, |
| unsigned char *address) |
| { |
| int index, rv = 0; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| if (channel >= IPMI_MAX_CHANNELS) { |
| rv = -EINVAL; |
| } else { |
| channel = array_index_nospec(channel, IPMI_MAX_CHANNELS); |
| *address = user->intf->addrinfo[channel].lun; |
| } |
| release_ipmi_user(user, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_get_my_LUN); |
| |
| int ipmi_get_maintenance_mode(struct ipmi_user *user) |
| { |
| int mode, index; |
| unsigned long flags; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags); |
| mode = user->intf->maintenance_mode; |
| spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags); |
| release_ipmi_user(user, index); |
| |
| return mode; |
| } |
| EXPORT_SYMBOL(ipmi_get_maintenance_mode); |
| |
| static void maintenance_mode_update(struct ipmi_smi *intf) |
| { |
| if (intf->handlers->set_maintenance_mode) |
| intf->handlers->set_maintenance_mode( |
| intf->send_info, intf->maintenance_mode_enable); |
| } |
| |
| int ipmi_set_maintenance_mode(struct ipmi_user *user, int mode) |
| { |
| int rv = 0, index; |
| unsigned long flags; |
| struct ipmi_smi *intf = user->intf; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| spin_lock_irqsave(&intf->maintenance_mode_lock, flags); |
| if (intf->maintenance_mode != mode) { |
| switch (mode) { |
| case IPMI_MAINTENANCE_MODE_AUTO: |
| intf->maintenance_mode_enable |
| = (intf->auto_maintenance_timeout > 0); |
| break; |
| |
| case IPMI_MAINTENANCE_MODE_OFF: |
| intf->maintenance_mode_enable = false; |
| break; |
| |
| case IPMI_MAINTENANCE_MODE_ON: |
| intf->maintenance_mode_enable = true; |
| break; |
| |
| default: |
| rv = -EINVAL; |
| goto out_unlock; |
| } |
| intf->maintenance_mode = mode; |
| |
| maintenance_mode_update(intf); |
| } |
| out_unlock: |
| spin_unlock_irqrestore(&intf->maintenance_mode_lock, flags); |
| release_ipmi_user(user, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_set_maintenance_mode); |
| |
| int ipmi_set_gets_events(struct ipmi_user *user, bool val) |
| { |
| unsigned long flags; |
| struct ipmi_smi *intf = user->intf; |
| struct ipmi_recv_msg *msg, *msg2; |
| struct list_head msgs; |
| int index; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| INIT_LIST_HEAD(&msgs); |
| |
| spin_lock_irqsave(&intf->events_lock, flags); |
| if (user->gets_events == val) |
| goto out; |
| |
| user->gets_events = val; |
| |
| if (val) { |
| if (atomic_inc_return(&intf->event_waiters) == 1) |
| need_waiter(intf); |
| } else { |
| atomic_dec(&intf->event_waiters); |
| } |
| |
| if (intf->delivering_events) |
| /* |
| * Another thread is delivering events for this, so |
| * let it handle any new events. |
| */ |
| goto out; |
| |
| /* Deliver any queued events. */ |
| while (user->gets_events && !list_empty(&intf->waiting_events)) { |
| list_for_each_entry_safe(msg, msg2, &intf->waiting_events, link) |
| list_move_tail(&msg->link, &msgs); |
| intf->waiting_events_count = 0; |
| if (intf->event_msg_printed) { |
| dev_warn(intf->si_dev, "Event queue no longer full\n"); |
| intf->event_msg_printed = 0; |
| } |
| |
| intf->delivering_events = 1; |
| spin_unlock_irqrestore(&intf->events_lock, flags); |
| |
| list_for_each_entry_safe(msg, msg2, &msgs, link) { |
| msg->user = user; |
| kref_get(&user->refcount); |
| deliver_local_response(intf, msg); |
| } |
| |
| spin_lock_irqsave(&intf->events_lock, flags); |
| intf->delivering_events = 0; |
| } |
| |
| out: |
| spin_unlock_irqrestore(&intf->events_lock, flags); |
| release_ipmi_user(user, index); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ipmi_set_gets_events); |
| |
| static struct cmd_rcvr *find_cmd_rcvr(struct ipmi_smi *intf, |
| unsigned char netfn, |
| unsigned char cmd, |
| unsigned char chan) |
| { |
| struct cmd_rcvr *rcvr; |
| |
| list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link, |
| lockdep_is_held(&intf->cmd_rcvrs_mutex)) { |
| if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd) |
| && (rcvr->chans & (1 << chan))) |
| return rcvr; |
| } |
| return NULL; |
| } |
| |
| static int is_cmd_rcvr_exclusive(struct ipmi_smi *intf, |
| unsigned char netfn, |
| unsigned char cmd, |
| unsigned int chans) |
| { |
| struct cmd_rcvr *rcvr; |
| |
| list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link, |
| lockdep_is_held(&intf->cmd_rcvrs_mutex)) { |
| if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd) |
| && (rcvr->chans & chans)) |
| return 0; |
| } |
| return 1; |
| } |
| |
| int ipmi_register_for_cmd(struct ipmi_user *user, |
| unsigned char netfn, |
| unsigned char cmd, |
| unsigned int chans) |
| { |
| struct ipmi_smi *intf = user->intf; |
| struct cmd_rcvr *rcvr; |
| int rv = 0, index; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL); |
| if (!rcvr) { |
| rv = -ENOMEM; |
| goto out_release; |
| } |
| rcvr->cmd = cmd; |
| rcvr->netfn = netfn; |
| rcvr->chans = chans; |
| rcvr->user = user; |
| |
| mutex_lock(&intf->cmd_rcvrs_mutex); |
| /* Make sure the command/netfn is not already registered. */ |
| if (!is_cmd_rcvr_exclusive(intf, netfn, cmd, chans)) { |
| rv = -EBUSY; |
| goto out_unlock; |
| } |
| |
| smi_add_watch(intf, IPMI_WATCH_MASK_CHECK_COMMANDS); |
| |
| list_add_rcu(&rcvr->link, &intf->cmd_rcvrs); |
| |
| out_unlock: |
| mutex_unlock(&intf->cmd_rcvrs_mutex); |
| if (rv) |
| kfree(rcvr); |
| out_release: |
| release_ipmi_user(user, index); |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_register_for_cmd); |
| |
| int ipmi_unregister_for_cmd(struct ipmi_user *user, |
| unsigned char netfn, |
| unsigned char cmd, |
| unsigned int chans) |
| { |
| struct ipmi_smi *intf = user->intf; |
| struct cmd_rcvr *rcvr; |
| struct cmd_rcvr *rcvrs = NULL; |
| int i, rv = -ENOENT, index; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| mutex_lock(&intf->cmd_rcvrs_mutex); |
| for (i = 0; i < IPMI_NUM_CHANNELS; i++) { |
| if (((1 << i) & chans) == 0) |
| continue; |
| rcvr = find_cmd_rcvr(intf, netfn, cmd, i); |
| if (rcvr == NULL) |
| continue; |
| if (rcvr->user == user) { |
| rv = 0; |
| rcvr->chans &= ~chans; |
| if (rcvr->chans == 0) { |
| list_del_rcu(&rcvr->link); |
| rcvr->next = rcvrs; |
| rcvrs = rcvr; |
| } |
| } |
| } |
| mutex_unlock(&intf->cmd_rcvrs_mutex); |
| synchronize_rcu(); |
| release_ipmi_user(user, index); |
| while (rcvrs) { |
| smi_remove_watch(intf, IPMI_WATCH_MASK_CHECK_COMMANDS); |
| rcvr = rcvrs; |
| rcvrs = rcvr->next; |
| kfree(rcvr); |
| } |
| |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_unregister_for_cmd); |
| |
| unsigned char |
| ipmb_checksum(unsigned char *data, int size) |
| { |
| unsigned char csum = 0; |
| |
| for (; size > 0; size--, data++) |
| csum += *data; |
| |
| return -csum; |
| } |
| EXPORT_SYMBOL(ipmb_checksum); |
| |
| static inline void format_ipmb_msg(struct ipmi_smi_msg *smi_msg, |
| struct kernel_ipmi_msg *msg, |
| struct ipmi_ipmb_addr *ipmb_addr, |
| long msgid, |
| unsigned char ipmb_seq, |
| int broadcast, |
| unsigned char source_address, |
| unsigned char source_lun) |
| { |
| int i = broadcast; |
| |
| /* Format the IPMB header data. */ |
| smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); |
| smi_msg->data[1] = IPMI_SEND_MSG_CMD; |
| smi_msg->data[2] = ipmb_addr->channel; |
| if (broadcast) |
| smi_msg->data[3] = 0; |
| smi_msg->data[i+3] = ipmb_addr->slave_addr; |
| smi_msg->data[i+4] = (msg->netfn << 2) | (ipmb_addr->lun & 0x3); |
| smi_msg->data[i+5] = ipmb_checksum(&smi_msg->data[i + 3], 2); |
| smi_msg->data[i+6] = source_address; |
| smi_msg->data[i+7] = (ipmb_seq << 2) | source_lun; |
| smi_msg->data[i+8] = msg->cmd; |
| |
| /* Now tack on the data to the message. */ |
| if (msg->data_len > 0) |
| memcpy(&smi_msg->data[i + 9], msg->data, msg->data_len); |
| smi_msg->data_size = msg->data_len + 9; |
| |
| /* Now calculate the checksum and tack it on. */ |
| smi_msg->data[i+smi_msg->data_size] |
| = ipmb_checksum(&smi_msg->data[i + 6], smi_msg->data_size - 6); |
| |
| /* |
| * Add on the checksum size and the offset from the |
| * broadcast. |
| */ |
| smi_msg->data_size += 1 + i; |
| |
| smi_msg->msgid = msgid; |
| } |
| |
| static inline void format_lan_msg(struct ipmi_smi_msg *smi_msg, |
| struct kernel_ipmi_msg *msg, |
| struct ipmi_lan_addr *lan_addr, |
| long msgid, |
| unsigned char ipmb_seq, |
| unsigned char source_lun) |
| { |
| /* Format the IPMB header data. */ |
| smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); |
| smi_msg->data[1] = IPMI_SEND_MSG_CMD; |
| smi_msg->data[2] = lan_addr->channel; |
| smi_msg->data[3] = lan_addr->session_handle; |
| smi_msg->data[4] = lan_addr->remote_SWID; |
| smi_msg->data[5] = (msg->netfn << 2) | (lan_addr->lun & 0x3); |
| smi_msg->data[6] = ipmb_checksum(&smi_msg->data[4], 2); |
| smi_msg->data[7] = lan_addr->local_SWID; |
| smi_msg->data[8] = (ipmb_seq << 2) | source_lun; |
| smi_msg->data[9] = msg->cmd; |
| |
| /* Now tack on the data to the message. */ |
| if (msg->data_len > 0) |
| memcpy(&smi_msg->data[10], msg->data, msg->data_len); |
| smi_msg->data_size = msg->data_len + 10; |
| |
| /* Now calculate the checksum and tack it on. */ |
| smi_msg->data[smi_msg->data_size] |
| = ipmb_checksum(&smi_msg->data[7], smi_msg->data_size - 7); |
| |
| /* |
| * Add on the checksum size and the offset from the |
| * broadcast. |
| */ |
| smi_msg->data_size += 1; |
| |
| smi_msg->msgid = msgid; |
| } |
| |
| static struct ipmi_smi_msg *smi_add_send_msg(struct ipmi_smi *intf, |
| struct ipmi_smi_msg *smi_msg, |
| int priority) |
| { |
| if (intf->curr_msg) { |
| if (priority > 0) |
| list_add_tail(&smi_msg->link, &intf->hp_xmit_msgs); |
| else |
| list_add_tail(&smi_msg->link, &intf->xmit_msgs); |
| smi_msg = NULL; |
| } else { |
| intf->curr_msg = smi_msg; |
| } |
| |
| return smi_msg; |
| } |
| |
| static void smi_send(struct ipmi_smi *intf, |
| const struct ipmi_smi_handlers *handlers, |
| struct ipmi_smi_msg *smi_msg, int priority) |
| { |
| int run_to_completion = intf->run_to_completion; |
| unsigned long flags = 0; |
| |
| if (!run_to_completion) |
| spin_lock_irqsave(&intf->xmit_msgs_lock, flags); |
| smi_msg = smi_add_send_msg(intf, smi_msg, priority); |
| |
| if (!run_to_completion) |
| spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags); |
| |
| if (smi_msg) |
| handlers->sender(intf->send_info, smi_msg); |
| } |
| |
| static bool is_maintenance_mode_cmd(struct kernel_ipmi_msg *msg) |
| { |
| return (((msg->netfn == IPMI_NETFN_APP_REQUEST) |
| && ((msg->cmd == IPMI_COLD_RESET_CMD) |
| || (msg->cmd == IPMI_WARM_RESET_CMD))) |
| || (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST)); |
| } |
| |
| static int i_ipmi_req_sysintf(struct ipmi_smi *intf, |
| struct ipmi_addr *addr, |
| long msgid, |
| struct kernel_ipmi_msg *msg, |
| struct ipmi_smi_msg *smi_msg, |
| struct ipmi_recv_msg *recv_msg, |
| int retries, |
| unsigned int retry_time_ms) |
| { |
| struct ipmi_system_interface_addr *smi_addr; |
| |
| if (msg->netfn & 1) |
| /* Responses are not allowed to the SMI. */ |
| return -EINVAL; |
| |
| smi_addr = (struct ipmi_system_interface_addr *) addr; |
| if (smi_addr->lun > 3) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| memcpy(&recv_msg->addr, smi_addr, sizeof(*smi_addr)); |
| |
| if ((msg->netfn == IPMI_NETFN_APP_REQUEST) |
| && ((msg->cmd == IPMI_SEND_MSG_CMD) |
| || (msg->cmd == IPMI_GET_MSG_CMD) |
| || (msg->cmd == IPMI_READ_EVENT_MSG_BUFFER_CMD))) { |
| /* |
| * We don't let the user do these, since we manage |
| * the sequence numbers. |
| */ |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| if (is_maintenance_mode_cmd(msg)) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&intf->maintenance_mode_lock, flags); |
| intf->auto_maintenance_timeout |
| = maintenance_mode_timeout_ms; |
| if (!intf->maintenance_mode |
| && !intf->maintenance_mode_enable) { |
| intf->maintenance_mode_enable = true; |
| maintenance_mode_update(intf); |
| } |
| spin_unlock_irqrestore(&intf->maintenance_mode_lock, |
| flags); |
| } |
| |
| if (msg->data_len + 2 > IPMI_MAX_MSG_LENGTH) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EMSGSIZE; |
| } |
| |
| smi_msg->data[0] = (msg->netfn << 2) | (smi_addr->lun & 0x3); |
| smi_msg->data[1] = msg->cmd; |
| smi_msg->msgid = msgid; |
| smi_msg->user_data = recv_msg; |
| if (msg->data_len > 0) |
| memcpy(&smi_msg->data[2], msg->data, msg->data_len); |
| smi_msg->data_size = msg->data_len + 2; |
| ipmi_inc_stat(intf, sent_local_commands); |
| |
| return 0; |
| } |
| |
| static int i_ipmi_req_ipmb(struct ipmi_smi *intf, |
| struct ipmi_addr *addr, |
| long msgid, |
| struct kernel_ipmi_msg *msg, |
| struct ipmi_smi_msg *smi_msg, |
| struct ipmi_recv_msg *recv_msg, |
| unsigned char source_address, |
| unsigned char source_lun, |
| int retries, |
| unsigned int retry_time_ms) |
| { |
| struct ipmi_ipmb_addr *ipmb_addr; |
| unsigned char ipmb_seq; |
| long seqid; |
| int broadcast = 0; |
| struct ipmi_channel *chans; |
| int rv = 0; |
| |
| if (addr->channel >= IPMI_MAX_CHANNELS) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| chans = READ_ONCE(intf->channel_list)->c; |
| |
| if (chans[addr->channel].medium != IPMI_CHANNEL_MEDIUM_IPMB) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) { |
| /* |
| * Broadcasts add a zero at the beginning of the |
| * message, but otherwise is the same as an IPMB |
| * address. |
| */ |
| addr->addr_type = IPMI_IPMB_ADDR_TYPE; |
| broadcast = 1; |
| retries = 0; /* Don't retry broadcasts. */ |
| } |
| |
| /* |
| * 9 for the header and 1 for the checksum, plus |
| * possibly one for the broadcast. |
| */ |
| if ((msg->data_len + 10 + broadcast) > IPMI_MAX_MSG_LENGTH) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EMSGSIZE; |
| } |
| |
| ipmb_addr = (struct ipmi_ipmb_addr *) addr; |
| if (ipmb_addr->lun > 3) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| memcpy(&recv_msg->addr, ipmb_addr, sizeof(*ipmb_addr)); |
| |
| if (recv_msg->msg.netfn & 0x1) { |
| /* |
| * It's a response, so use the user's sequence |
| * from msgid. |
| */ |
| ipmi_inc_stat(intf, sent_ipmb_responses); |
| format_ipmb_msg(smi_msg, msg, ipmb_addr, msgid, |
| msgid, broadcast, |
| source_address, source_lun); |
| |
| /* |
| * Save the receive message so we can use it |
| * to deliver the response. |
| */ |
| smi_msg->user_data = recv_msg; |
| } else { |
| /* It's a command, so get a sequence for it. */ |
| unsigned long flags; |
| |
| spin_lock_irqsave(&intf->seq_lock, flags); |
| |
| if (is_maintenance_mode_cmd(msg)) |
| intf->ipmb_maintenance_mode_timeout = |
| maintenance_mode_timeout_ms; |
| |
| if (intf->ipmb_maintenance_mode_timeout && retry_time_ms == 0) |
| /* Different default in maintenance mode */ |
| retry_time_ms = default_maintenance_retry_ms; |
| |
| /* |
| * Create a sequence number with a 1 second |
| * timeout and 4 retries. |
| */ |
| rv = intf_next_seq(intf, |
| recv_msg, |
| retry_time_ms, |
| retries, |
| broadcast, |
| &ipmb_seq, |
| &seqid); |
| if (rv) |
| /* |
| * We have used up all the sequence numbers, |
| * probably, so abort. |
| */ |
| goto out_err; |
| |
| ipmi_inc_stat(intf, sent_ipmb_commands); |
| |
| /* |
| * Store the sequence number in the message, |
| * so that when the send message response |
| * comes back we can start the timer. |
| */ |
| format_ipmb_msg(smi_msg, msg, ipmb_addr, |
| STORE_SEQ_IN_MSGID(ipmb_seq, seqid), |
| ipmb_seq, broadcast, |
| source_address, source_lun); |
| |
| /* |
| * Copy the message into the recv message data, so we |
| * can retransmit it later if necessary. |
| */ |
| memcpy(recv_msg->msg_data, smi_msg->data, |
| smi_msg->data_size); |
| recv_msg->msg.data = recv_msg->msg_data; |
| recv_msg->msg.data_len = smi_msg->data_size; |
| |
| /* |
| * We don't unlock until here, because we need |
| * to copy the completed message into the |
| * recv_msg before we release the lock. |
| * Otherwise, race conditions may bite us. I |
| * know that's pretty paranoid, but I prefer |
| * to be correct. |
| */ |
| out_err: |
| spin_unlock_irqrestore(&intf->seq_lock, flags); |
| } |
| |
| return rv; |
| } |
| |
| static int i_ipmi_req_ipmb_direct(struct ipmi_smi *intf, |
| struct ipmi_addr *addr, |
| long msgid, |
| struct kernel_ipmi_msg *msg, |
| struct ipmi_smi_msg *smi_msg, |
| struct ipmi_recv_msg *recv_msg, |
| unsigned char source_lun) |
| { |
| struct ipmi_ipmb_direct_addr *daddr; |
| bool is_cmd = !(recv_msg->msg.netfn & 0x1); |
| |
| if (!(intf->handlers->flags & IPMI_SMI_CAN_HANDLE_IPMB_DIRECT)) |
| return -EAFNOSUPPORT; |
| |
| /* Responses must have a completion code. */ |
| if (!is_cmd && msg->data_len < 1) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| if ((msg->data_len + 4) > IPMI_MAX_MSG_LENGTH) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EMSGSIZE; |
| } |
| |
| daddr = (struct ipmi_ipmb_direct_addr *) addr; |
| if (daddr->rq_lun > 3 || daddr->rs_lun > 3) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| smi_msg->type = IPMI_SMI_MSG_TYPE_IPMB_DIRECT; |
| smi_msg->msgid = msgid; |
| |
| if (is_cmd) { |
| smi_msg->data[0] = msg->netfn << 2 | daddr->rs_lun; |
| smi_msg->data[2] = recv_msg->msgid << 2 | daddr->rq_lun; |
| } else { |
| smi_msg->data[0] = msg->netfn << 2 | daddr->rq_lun; |
| smi_msg->data[2] = recv_msg->msgid << 2 | daddr->rs_lun; |
| } |
| smi_msg->data[1] = daddr->slave_addr; |
| smi_msg->data[3] = msg->cmd; |
| |
| memcpy(smi_msg->data + 4, msg->data, msg->data_len); |
| smi_msg->data_size = msg->data_len + 4; |
| |
| smi_msg->user_data = recv_msg; |
| |
| return 0; |
| } |
| |
| static int i_ipmi_req_lan(struct ipmi_smi *intf, |
| struct ipmi_addr *addr, |
| long msgid, |
| struct kernel_ipmi_msg *msg, |
| struct ipmi_smi_msg *smi_msg, |
| struct ipmi_recv_msg *recv_msg, |
| unsigned char source_lun, |
| int retries, |
| unsigned int retry_time_ms) |
| { |
| struct ipmi_lan_addr *lan_addr; |
| unsigned char ipmb_seq; |
| long seqid; |
| struct ipmi_channel *chans; |
| int rv = 0; |
| |
| if (addr->channel >= IPMI_MAX_CHANNELS) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| chans = READ_ONCE(intf->channel_list)->c; |
| |
| if ((chans[addr->channel].medium |
| != IPMI_CHANNEL_MEDIUM_8023LAN) |
| && (chans[addr->channel].medium |
| != IPMI_CHANNEL_MEDIUM_ASYNC)) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| /* 11 for the header and 1 for the checksum. */ |
| if ((msg->data_len + 12) > IPMI_MAX_MSG_LENGTH) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EMSGSIZE; |
| } |
| |
| lan_addr = (struct ipmi_lan_addr *) addr; |
| if (lan_addr->lun > 3) { |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| return -EINVAL; |
| } |
| |
| memcpy(&recv_msg->addr, lan_addr, sizeof(*lan_addr)); |
| |
| if (recv_msg->msg.netfn & 0x1) { |
| /* |
| * It's a response, so use the user's sequence |
| * from msgid. |
| */ |
| ipmi_inc_stat(intf, sent_lan_responses); |
| format_lan_msg(smi_msg, msg, lan_addr, msgid, |
| msgid, source_lun); |
| |
| /* |
| * Save the receive message so we can use it |
| * to deliver the response. |
| */ |
| smi_msg->user_data = recv_msg; |
| } else { |
| /* It's a command, so get a sequence for it. */ |
| unsigned long flags; |
| |
| spin_lock_irqsave(&intf->seq_lock, flags); |
| |
| /* |
| * Create a sequence number with a 1 second |
| * timeout and 4 retries. |
| */ |
| rv = intf_next_seq(intf, |
| recv_msg, |
| retry_time_ms, |
| retries, |
| 0, |
| &ipmb_seq, |
| &seqid); |
| if (rv) |
| /* |
| * We have used up all the sequence numbers, |
| * probably, so abort. |
| */ |
| goto out_err; |
| |
| ipmi_inc_stat(intf, sent_lan_commands); |
| |
| /* |
| * Store the sequence number in the message, |
| * so that when the send message response |
| * comes back we can start the timer. |
| */ |
| format_lan_msg(smi_msg, msg, lan_addr, |
| STORE_SEQ_IN_MSGID(ipmb_seq, seqid), |
| ipmb_seq, source_lun); |
| |
| /* |
| * Copy the message into the recv message data, so we |
| * can retransmit it later if necessary. |
| */ |
| memcpy(recv_msg->msg_data, smi_msg->data, |
| smi_msg->data_size); |
| recv_msg->msg.data = recv_msg->msg_data; |
| recv_msg->msg.data_len = smi_msg->data_size; |
| |
| /* |
| * We don't unlock until here, because we need |
| * to copy the completed message into the |
| * recv_msg before we release the lock. |
| * Otherwise, race conditions may bite us. I |
| * know that's pretty paranoid, but I prefer |
| * to be correct. |
| */ |
| out_err: |
| spin_unlock_irqrestore(&intf->seq_lock, flags); |
| } |
| |
| return rv; |
| } |
| |
| /* |
| * Separate from ipmi_request so that the user does not have to be |
| * supplied in certain circumstances (mainly at panic time). If |
| * messages are supplied, they will be freed, even if an error |
| * occurs. |
| */ |
| static int i_ipmi_request(struct ipmi_user *user, |
| struct ipmi_smi *intf, |
| struct ipmi_addr *addr, |
| long msgid, |
| struct kernel_ipmi_msg *msg, |
| void *user_msg_data, |
| void *supplied_smi, |
| struct ipmi_recv_msg *supplied_recv, |
| int priority, |
| unsigned char source_address, |
| unsigned char source_lun, |
| int retries, |
| unsigned int retry_time_ms) |
| { |
| struct ipmi_smi_msg *smi_msg; |
| struct ipmi_recv_msg *recv_msg; |
| int rv = 0; |
| |
| if (supplied_recv) |
| recv_msg = supplied_recv; |
| else { |
| recv_msg = ipmi_alloc_recv_msg(); |
| if (recv_msg == NULL) { |
| rv = -ENOMEM; |
| goto out; |
| } |
| } |
| recv_msg->user_msg_data = user_msg_data; |
| |
| if (supplied_smi) |
| smi_msg = (struct ipmi_smi_msg *) supplied_smi; |
| else { |
| smi_msg = ipmi_alloc_smi_msg(); |
| if (smi_msg == NULL) { |
| if (!supplied_recv) |
| ipmi_free_recv_msg(recv_msg); |
| rv = -ENOMEM; |
| goto out; |
| } |
| } |
| |
| rcu_read_lock(); |
| if (intf->in_shutdown) { |
| rv = -ENODEV; |
| goto out_err; |
| } |
| |
| recv_msg->user = user; |
| if (user) |
| /* The put happens when the message is freed. */ |
| kref_get(&user->refcount); |
| recv_msg->msgid = msgid; |
| /* |
| * Store the message to send in the receive message so timeout |
| * responses can get the proper response data. |
| */ |
| recv_msg->msg = *msg; |
| |
| if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) { |
| rv = i_ipmi_req_sysintf(intf, addr, msgid, msg, smi_msg, |
| recv_msg, retries, retry_time_ms); |
| } else if (is_ipmb_addr(addr) || is_ipmb_bcast_addr(addr)) { |
| rv = i_ipmi_req_ipmb(intf, addr, msgid, msg, smi_msg, recv_msg, |
| source_address, source_lun, |
| retries, retry_time_ms); |
| } else if (is_ipmb_direct_addr(addr)) { |
| rv = i_ipmi_req_ipmb_direct(intf, addr, msgid, msg, smi_msg, |
| recv_msg, source_lun); |
| } else if (is_lan_addr(addr)) { |
| rv = i_ipmi_req_lan(intf, addr, msgid, msg, smi_msg, recv_msg, |
| source_lun, retries, retry_time_ms); |
| } else { |
| /* Unknown address type. */ |
| ipmi_inc_stat(intf, sent_invalid_commands); |
| rv = -EINVAL; |
| } |
| |
| if (rv) { |
| out_err: |
| ipmi_free_smi_msg(smi_msg); |
| ipmi_free_recv_msg(recv_msg); |
| } else { |
| pr_debug("Send: %*ph\n", smi_msg->data_size, smi_msg->data); |
| |
| smi_send(intf, intf->handlers, smi_msg, priority); |
| } |
| rcu_read_unlock(); |
| |
| out: |
| return rv; |
| } |
| |
| static int check_addr(struct ipmi_smi *intf, |
| struct ipmi_addr *addr, |
| unsigned char *saddr, |
| unsigned char *lun) |
| { |
| if (addr->channel >= IPMI_MAX_CHANNELS) |
| return -EINVAL; |
| addr->channel = array_index_nospec(addr->channel, IPMI_MAX_CHANNELS); |
| *lun = intf->addrinfo[addr->channel].lun; |
| *saddr = intf->addrinfo[addr->channel].address; |
| return 0; |
| } |
| |
| int ipmi_request_settime(struct ipmi_user *user, |
| struct ipmi_addr *addr, |
| long msgid, |
| struct kernel_ipmi_msg *msg, |
| void *user_msg_data, |
| int priority, |
| int retries, |
| unsigned int retry_time_ms) |
| { |
| unsigned char saddr = 0, lun = 0; |
| int rv, index; |
| |
| if (!user) |
| return -EINVAL; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| rv = check_addr(user->intf, addr, &saddr, &lun); |
| if (!rv) |
| rv = i_ipmi_request(user, |
| user->intf, |
| addr, |
| msgid, |
| msg, |
| user_msg_data, |
| NULL, NULL, |
| priority, |
| saddr, |
| lun, |
| retries, |
| retry_time_ms); |
| |
| release_ipmi_user(user, index); |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_request_settime); |
| |
| int ipmi_request_supply_msgs(struct ipmi_user *user, |
| struct ipmi_addr *addr, |
| long msgid, |
| struct kernel_ipmi_msg *msg, |
| void *user_msg_data, |
| void *supplied_smi, |
| struct ipmi_recv_msg *supplied_recv, |
| int priority) |
| { |
| unsigned char saddr = 0, lun = 0; |
| int rv, index; |
| |
| if (!user) |
| return -EINVAL; |
| |
| user = acquire_ipmi_user(user, &index); |
| if (!user) |
| return -ENODEV; |
| |
| rv = check_addr(user->intf, addr, &saddr, &lun); |
| if (!rv) |
| rv = i_ipmi_request(user, |
| user->intf, |
| addr, |
| msgid, |
| msg, |
| user_msg_data, |
| supplied_smi, |
| supplied_recv, |
| priority, |
| saddr, |
| lun, |
| -1, 0); |
| |
| release_ipmi_user(user, index); |
| return rv; |
| } |
| EXPORT_SYMBOL(ipmi_request_supply_msgs); |
| |
| static void bmc_device_id_handler(struct ipmi_smi *intf, |
| struct ipmi_recv_msg *msg) |
| { |
| int rv; |
| |
| if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE) |
| || (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE) |
| || (msg->msg.cmd != IPMI_GET_DEVICE_ID_CMD)) { |
| dev_warn(intf->si_dev, |
| "invalid device_id msg: addr_type=%d netfn=%x cmd=%x\n", |
| msg->addr.addr_type, msg->msg.netfn, msg->msg.cmd); |
| return; |
| } |
| |
| if (msg->msg.data[0]) { |
| dev_warn(intf->si_dev, "device id fetch failed: 0x%2.2x\n", |
| msg->msg.data[0]); |
| intf->bmc->dyn_id_set = 0; |
| goto out; |
| } |
| |
| rv = ipmi_demangle_device_id(msg->msg.netfn, msg->msg.cmd, |
| msg->msg.data, msg->msg.data_len, &intf->bmc->fetch_id); |
| if (rv) { |
| dev_warn(intf->si_dev, "device id demangle failed: %d\n", rv); |
| /* record completion code when error */ |
| intf->bmc->cc = msg->msg.data[0]; |
| intf->bmc->dyn_id_set = 0; |
| } else { |
| /* |
| * Make sure the id data is available before setting |
| * dyn_id_set. |
| */ |
| smp_wmb(); |
| intf->bmc->dyn_id_set = 1; |
| } |
| out: |
| wake_up(&intf->waitq); |
| } |
| |
| static int |
| send_get_device_id_cmd(struct ipmi_smi *intf) |
| { |
| struct ipmi_system_interface_addr si; |
| struct kernel_ipmi_msg msg; |
| |
| si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
| si.channel = IPMI_BMC_CHANNEL; |
| si.lun = 0; |
| |
| msg.netfn = IPMI_NETFN_APP_REQUEST; |
| msg.cmd = IPMI_GET_DEVICE_ID_CMD; |
| msg.data = NULL; |
| msg.data_len = 0; |
| |
| return i_ipmi_request(NULL, |
| intf, |
| (struct ipmi_addr *) &si, |
| 0, |
| &msg, |
| intf, |
| NULL, |
| NULL, |
| 0, |
| intf->addrinfo[0].address, |
| intf->addrinfo[0].lun, |
| -1, 0); |
| } |
| |
| static int __get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc) |
| { |
| int rv; |
| unsigned int retry_count = 0; |
| |
| intf->null_user_handler = bmc_device_id_handler; |
| |
| retry: |
| bmc->cc = 0; |
| bmc->dyn_id_set = 2; |
| |
| rv = send_get_device_id_cmd(intf); |
| if (rv) |
| goto out_reset_handler; |
| |
| wait_event(intf->waitq, bmc->dyn_id_set != 2); |
| |
| if (!bmc->dyn_id_set) { |
| if (bmc->cc != IPMI_CC_NO_ERROR && |
| ++retry_count <= GET_DEVICE_ID_MAX_RETRY) { |
| msleep(500); |
| dev_warn(intf->si_dev, |
| "BMC returned 0x%2.2x, retry get bmc device id\n", |
| bmc->cc); |
| goto retry; |
| } |
| |
| rv = -EIO; /* Something went wrong in the fetch. */ |
| } |
| |
| /* dyn_id_set makes the id data available. */ |
| smp_rmb(); |
| |
| out_reset_handler: |
| intf->null_user_handler = NULL; |
| |
| return rv; |
| } |
| |
| /* |
| * Fetch the device id for the bmc/interface. You must pass in either |
| * bmc or intf, this code will get the other one. If the data has |
| * been recently fetched, this will just use the cached data. Otherwise |
| * it will run a new fetch. |
| * |
| * Except for the first time this is called (in ipmi_add_smi()), |
| * this will always return good data; |
| */ |
| static int __bmc_get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc, |
| struct ipmi_device_id *id, |
| bool *guid_set, guid_t *guid, int intf_num) |
| { |
| int rv = 0; |
| int prev_dyn_id_set, prev_guid_set; |
| bool intf_set = intf != NULL; |
| |
| if (!intf) { |
| mutex_lock(&bmc->dyn_mutex); |
| retry_bmc_lock: |
| if (list_empty(&bmc->intfs)) { |
| mutex_unlock(&bmc->dyn_mutex); |
| return -ENOENT; |
| } |
| intf = list_first_entry(&bmc->intfs, struct ipmi_smi, |
| bmc_link); |
| kref_get(&intf->refcount); |
| mutex_unlock(&bmc->dyn_mutex); |
| mutex_lock(&intf->bmc_reg_mutex); |
| mutex_lock(&bmc->dyn_mutex); |
| if (intf != list_first_entry(&bmc->intfs, struct ipmi_smi, |
| bmc_link)) { |
| mutex_unlock(&intf->bmc_reg_mutex); |
| kref_put(&intf->refcount, intf_free); |
| goto retry_bmc_lock; |
| } |
| } else { |
| mutex_lock(&intf->bmc_reg_mutex); |
| bmc = intf->bmc; |
| mutex_lock(&bmc->dyn_mutex); |
| kref_get(&intf->refcount); |
| } |
| |
| /* If we have a valid and current ID, just return that. */ |
| if (intf->in_bmc_register || |
| (bmc->dyn_id_set && time_is_after_jiffies(bmc->dyn_id_expiry))) |
| goto out_noprocessing; |
| |
| prev_guid_set = bmc->dyn_guid_set; |
| __get_guid(intf); |
| |
| prev_dyn_id_set = bmc->dyn_id_set; |
| rv = __get_device_id(intf, bmc); |
| if (rv) |
| goto out; |
| |
| /* |
| * The guid, device id, manufacturer id, and product id should |
| * not change on a BMC. If it does we have to do some dancing. |
| */ |
| if (!intf->bmc_registered |
| || (!prev_guid_set && bmc->dyn_guid_set) |
| || (!prev_dyn_id_set && bmc->dyn_id_set) |
| || (prev_guid_set && bmc->dyn_guid_set |
| && !guid_equal(&bmc->guid, &bmc->fetch_guid)) |
| || bmc->id.device_id != bmc->fetch_id.device_id |
| || bmc->id.manufacturer_id != bmc->fetch_id.manufacturer_id |
| || bmc->id.product_id != bmc->fetch_id.product_id) { |
| struct ipmi_device_id id = bmc->fetch_id; |
| int guid_set = bmc->dyn_guid_set; |
| guid_t guid; |
| |
| guid = bmc->fetch_guid; |
| mutex_unlock(&bmc->dyn_mutex); |
| |
| __ipmi_bmc_unregister(intf); |
| /* Fill in the temporary BMC for good measure. */ |
| intf->bmc->id = id; |
| intf->bmc->dyn_guid_set = guid_set; |
| intf->bmc->guid = guid; |
| if (__ipmi_bmc_register(intf, &id, guid_set, &guid, intf_num)) |
| need_waiter(intf); /* Retry later on an error. */ |
| else |
| __scan_channels(intf, &id); |
| |
| |
| if (!intf_set) { |
| /* |
| * We weren't given the interface on the |
| * command line, so restart the operation on |
| * the next interface for the BMC. |
| */ |
| mutex_unlock(&intf->bmc_reg_mutex); |
| mutex_lock(&bmc->dyn_mutex); |
| goto retry_bmc_lock; |
| } |
| |
| /* We have a new BMC, set it up. */ |
| bmc = intf->bmc; |
| mutex_lock(&bmc->dyn_mutex); |
| goto out_noprocessing; |
| } else if (memcmp(&bmc->fetch_id, &bmc->id, sizeof(bmc->id))) |
| /* Version info changes, scan the channels again. */ |
| __scan_channels(intf, &bmc->fetch_id); |
| |
| bmc->dyn_id_expiry = jiffies + IPMI_DYN_DEV_ID_EXPIRY; |
| |
| out: |
| if (rv && prev_dyn_id_set) { |
| rv = 0; /* Ignore failures if we have previous data. */ |
| bmc->dyn_id_set = prev_dyn_id_set; |
| } |
| if (!rv) { |
| bmc->id = bmc->fetch_id; |
| if (bmc->dyn_guid_set) |
| bmc->guid = bmc->fetch_guid; |
| else if (prev_guid_set) |
| /* |
| * The guid used to be valid and it failed to fetch, |
| * just use the cached value. |
| */ |
| bmc->dyn_guid_set = prev_guid_set; |
| } |
| out_noprocessing: |
| if (!rv) { |
| if (id) |
| *id = bmc->id; |
| |
| if (guid_set) |
| *guid_set = bmc->dyn_guid_set; |
| |
| if (guid && bmc->dyn_guid_set) |
| *guid = bmc->guid; |
| } |
| |
| mutex_unlock(&bmc->dyn_mutex); |
| mutex_unlock(&intf->bmc_reg_mutex); |
| |
| kref_put(&intf->refcount, intf_free); |
| return rv; |
| } |
| |
| static int bmc_get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc, |
| struct ipmi_device_id *id, |
| bool *guid_set, guid_t *guid) |
| { |
| return __bmc_get_device_id(intf, bmc, id, guid_set, guid, -1); |
| } |
| |
| static ssize_t device_id_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "%u\n", id.device_id); |
| } |
| static DEVICE_ATTR_RO(device_id); |
| |
| static ssize_t provides_device_sdrs_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "%u\n", (id.device_revision & 0x80) >> 7); |
| } |
| static DEVICE_ATTR_RO(provides_device_sdrs); |
| |
| static ssize_t revision_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "%u\n", id.device_revision & 0x0F); |
| } |
| static DEVICE_ATTR_RO(revision); |
| |
| static ssize_t firmware_revision_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "%u.%x\n", id.firmware_revision_1, |
| id.firmware_revision_2); |
| } |
| static DEVICE_ATTR_RO(firmware_revision); |
| |
| static ssize_t ipmi_version_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "%u.%u\n", |
| ipmi_version_major(&id), |
| ipmi_version_minor(&id)); |
| } |
| static DEVICE_ATTR_RO(ipmi_version); |
| |
| static ssize_t add_dev_support_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "0x%02x\n", id.additional_device_support); |
| } |
| static DEVICE_ATTR(additional_device_support, S_IRUGO, add_dev_support_show, |
| NULL); |
| |
| static ssize_t manufacturer_id_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "0x%6.6x\n", id.manufacturer_id); |
| } |
| static DEVICE_ATTR_RO(manufacturer_id); |
| |
| static ssize_t product_id_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "0x%4.4x\n", id.product_id); |
| } |
| static DEVICE_ATTR_RO(product_id); |
| |
| static ssize_t aux_firmware_rev_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| struct ipmi_device_id id; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| if (rv) |
| return rv; |
| |
| return sysfs_emit(buf, "0x%02x 0x%02x 0x%02x 0x%02x\n", |
| id.aux_firmware_revision[3], |
| id.aux_firmware_revision[2], |
| id.aux_firmware_revision[1], |
| id.aux_firmware_revision[0]); |
| } |
| static DEVICE_ATTR(aux_firmware_revision, S_IRUGO, aux_firmware_rev_show, NULL); |
| |
| static ssize_t guid_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct bmc_device *bmc = to_bmc_device(dev); |
| bool guid_set; |
| guid_t guid; |
| int rv; |
| |
| rv = bmc_get_device_id(NULL, bmc, NULL, &guid_set, &guid); |
| if (rv) |
| return rv; |
| if (!guid_set) |
| return -ENOENT; |
| |
| return sysfs_emit(buf, "%pUl\n", &guid); |
| } |
| static DEVICE_ATTR_RO(guid); |
| |
| static struct attribute *bmc_dev_attrs[] = { |
| &dev_attr_device_id.attr, |
| &dev_attr_provides_device_sdrs.attr, |
| &dev_attr_revision.attr, |
| &dev_attr_firmware_revision.attr, |
| &dev_attr_ipmi_version.attr, |
| &dev_attr_additional_device_support.attr, |
| &dev_attr_manufacturer_id.attr, |
| &dev_attr_product_id.attr, |
| &dev_attr_aux_firmware_revision.attr, |
| &dev_attr_guid.attr, |
| NULL |
| }; |
| |
| static umode_t bmc_dev_attr_is_visible(struct kobject *kobj, |
| struct attribute *attr, int idx) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct bmc_device *bmc = to_bmc_device(dev); |
| umode_t mode = attr->mode; |
| int rv; |
| |
| if (attr == &dev_attr_aux_firmware_revision.attr) { |
| struct ipmi_device_id id; |
| |
| rv = bmc_get_device_id(NULL, bmc, &id, NULL, NULL); |
| return (!rv && id.aux_firmware_revision_set) ? mode : 0; |
| } |
| if (attr == &dev_attr_guid.attr) { |
| bool guid_set; |
| |
| rv = bmc_get_device_id(NULL, bmc, NULL, &guid_set, NULL); |
| return (!rv && guid_set) ? mode : 0; |
| } |
| return mode; |
| } |
| |
| static const struct attribute_group bmc_dev_attr_group = { |
| .attrs = bmc_dev_attrs, |
| .is_visible = bmc_dev_attr_is_visible, |
| }; |
| |
| static const struct attribute_group *bmc_dev_attr_groups[] = { |
| &bmc_dev_attr_group, |
| NULL |
| }; |
| |
| static const struct device_type bmc_device_type = { |
| .groups = bmc_dev_attr_groups, |
| }; |
| |
| static int __find_bmc_guid(struct device *dev, const void *data) |
| { |
| const guid_t *guid = data; |
| struct bmc_device *bmc; |
| int rv; |
| |
| if (dev->type != &bmc_device_type) |
| return 0; |
| |
| bmc = to_bmc_device(dev); |
| rv = bmc->dyn_guid_set && guid_equal(&bmc->guid, guid); |
| if (rv) |
| rv = kref_get_unless_zero(&bmc->usecount); |
| return rv; |
| } |
| |
| /* |
| * Returns with the bmc's usecount incremented, if it is non-NULL. |
| */ |
| static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv, |
| guid_t *guid) |
| { |
| struct device *dev; |
| struct bmc_device *bmc = NULL; |
| |
| dev = driver_find_device(drv, NULL, guid, __find_bmc_guid); |
| if (dev) { |
| bmc = to_bmc_device(dev); |
| put_device(dev); |
| } |
| return bmc; |
| } |
| |
| struct prod_dev_id { |
| unsigned int product_id; |
| unsigned char device_id; |
| }; |
| |
| static int __find_bmc_prod_dev_id(struct device *dev, const void *data) |
| { |
| const struct prod_dev_id *cid = data; |
| struct bmc_device *bmc; |
| int rv; |
| |
| if (dev->type != &bmc_device_type) |
| return 0; |
| |
| bmc = to_bmc_device(dev); |
| rv = (bmc->id.product_id == cid->product_id |
| && bmc->id.device_id == cid->device_id); |
| if (rv) |
| rv = kref_get_unless_zero(&bmc->usecount); |
| return rv; |
| } |
| |
| /* |
| * Returns with the bmc's usecount incremented, if it is non-NULL. |
| */ |
| static struct bmc_device *ipmi_find_bmc_prod_dev_id( |
| struct device_driver *drv, |
| unsigned int product_id, unsigned char device_id) |
| { |
| struct prod_dev_id id = { |
| .product_id = product_id, |
| .device_id = device_id, |
| }; |
| struct device *dev; |
| struct bmc_device *bmc = NULL; |
| |
| dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id); |
| if (dev) { |
| bmc = to_bmc_device(dev); |
| put_device(dev); |
| } |
| return bmc; |
| } |
| |
| static DEFINE_IDA(ipmi_bmc_ida); |
| |
| static void |
| release_bmc_device(struct device *dev) |
| { |
| kfree(to_bmc_device(dev)); |
| } |
| |
| static void cleanup_bmc_work(struct work_struct *work) |
| { |
| struct bmc_device *bmc = container_of(work, struct bmc_device, |
| remove_work); |
| int id = bmc->pdev.id; /* Unregister overwrites id */ |
| |
| platform_device_unregister(&bmc->pdev); |
| ida_simple_remove(&ipmi_bmc_ida, id); |
| } |
| |
| static void |
| cleanup_bmc_device(struct kref *ref) |
| { |
| struct bmc_device *bmc = container_of(ref, struct bmc_device, usecount); |
| |
| /* |
| * Remove the platform device in a work queue to avoid issues |
| * with removing the device attributes while reading a device |
| * attribute. |
| */ |
| schedule_work(&bmc->remove_work); |
| } |
| |
| /* |
| * Must be called with intf->bmc_reg_mutex held. |
| */ |
| static void __ipmi_bmc_unregister(struct ipmi_smi *intf) |
| { |
| struct bmc_device *bmc = intf->bmc; |
| |
| if (!intf->bmc_registered) |
| return; |
| |
| sysfs_remove_link(&intf->si_dev->kobj, "bmc"); |
| sysfs_remove_link(&bmc->pdev.dev.kobj, intf->my_dev_name); |
| kfree(intf->my_dev_name); |
| intf->my_dev_name = NULL; |
| |
| mutex_lock(&bmc->dyn_mutex); |
| list_del(&intf->bmc_link); |
| mutex_unlock(&bmc->dyn_mutex); |
| intf->bmc = &intf->tmp_bmc; |
| kref_put(&bmc->usecount, cleanup_bmc_device); |
| intf->bmc_registered = false; |
| } |
| |
| static void ipmi_bmc_unregister(struct ipmi_smi *intf) |
| { |
| mutex_lock(&intf->bmc_reg_mutex); |
| __ipmi_bmc_unregister(intf); |
| mutex_unlock(&intf->bmc_reg_mutex); |
| } |
| |
| /* |
| * Must be called with intf->bmc_reg_mutex held. |
| */ |
| static int __ipmi_bmc_register(struct ipmi_smi *intf, |
| struct ipmi_device_id *id, |
| bool guid_set, guid_t *guid, int intf_num) |
| { |
| int rv; |
| struct bmc_device *bmc; |
| struct bmc_device *old_bmc; |
| |
| /* |
| * platform_device_register() can cause bmc_reg_mutex to |
| * be claimed because of the is_visible functions of |
| * the attributes. Eliminate possible recursion and |
| * release the lock. |
| */ |
| intf->in_bmc_register = true; |
| mutex_unlock(&intf->bmc_reg_mutex); |
| |
| /* |
| * Try to find if there is an bmc_device struct |
| * representing the interfaced BMC already |
| */ |
| mutex_lock(&ipmidriver_mutex); |
| if (guid_set) |
| old_bmc = ipmi_find_bmc_guid(&ipmidriver.driver, guid); |
| else |
| old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver.driver, |
| id->product_id, |
| id->device_id); |
| |
| /* |
| * If there is already an bmc_device, free the new one, |
| * otherwise register the new BMC device |
| */ |
| if (old_bmc) { |
| bmc = old_bmc; |
| /* |
| * Note: old_bmc already has usecount incremented by |
| * the BMC find functions. |
| */ |
| intf->bmc = old_bmc; |
| mutex_lock(&bmc->dyn_mutex); |
| list_add_tail(&intf->bmc_link, &bmc->intfs); |
| mutex_unlock(&bmc->dyn_mutex); |
| |
| dev_info(intf->si_dev, |
| "interfacing existing BMC (man_id: 0x%6.6x, prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n", |
| bmc->id.manufacturer_id, |
| bmc->id.product_id, |
| bmc->id.device_id); |
| } else { |
| bmc = kzalloc(sizeof(*bmc), GFP_KERNEL); |
| if (!bmc) { |
| rv = -ENOMEM; |
| goto out; |
| } |
| INIT_LIST_HEAD(&bmc->intfs); |
| mutex_init(&bmc->dyn_mutex); |
| INIT_WORK(&bmc->remove_work, cleanup_bmc_work); |
| |
| bmc->id = *id; |
| bmc->dyn_id_set = 1; |
| bmc->dyn_guid_set = guid_set; |
| bmc->guid = *guid; |
| bmc->dyn_id_expiry = jiffies + IPMI_DYN_DEV_ID_EXPIRY; |
| |
| bmc->pdev.name = "ipmi_bmc"; |
| |
| rv = ida_simple_get(&ipmi_bmc_ida, 0, 0, GFP_KERNEL); |
| if (rv < 0) { |
| kfree(bmc); |
| goto out; |
| } |
| |
| bmc->pdev.dev.driver = &ipmidriver.driver; |
| bmc->pdev.id = rv; |
| bmc->pdev.dev.release = release_bmc_device; |
| bmc->pdev.dev.type = &bmc_device_type; |
| kref_init(&bmc->usecount); |
| |
| intf->bmc = bmc; |
| mutex_lock(&bmc->dyn_mutex); |
| list_add_tail(&intf->bmc_link, &bmc->intfs); |
| mutex_unlock(&bmc->dyn_mutex); |
| |
| rv = platform_device_register(&bmc->pdev); |
| if (rv) { |
| dev_err(intf->si_dev, |
| "Unable to register bmc device: %d\n", |
| rv); |
| goto out_list_del; |
| } |
| |
| dev_info(intf->si_dev, |
| "Found new BMC (man_id: 0x%6.6x, prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n", |
| |