v4.19.13 snapshot.
diff --git a/include/linux/ipmi.h b/include/linux/ipmi.h
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+++ b/include/linux/ipmi.h
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * ipmi.h
+ *
+ * MontaVista IPMI interface
+ *
+ * Author: MontaVista Software, Inc.
+ * Corey Minyard <minyard@mvista.com>
+ * source@mvista.com
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ *
+ */
+#ifndef __LINUX_IPMI_H
+#define __LINUX_IPMI_H
+
+#include <uapi/linux/ipmi.h>
+
+#include <linux/list.h>
+#include <linux/proc_fs.h>
+#include <linux/acpi.h> /* For acpi_handle */
+
+struct module;
+struct device;
+
+/*
+ * Opaque type for a IPMI message user. One of these is needed to
+ * send and receive messages.
+ */
+typedef struct ipmi_user *ipmi_user_t;
+
+/*
+ * Stuff coming from the receive interface comes as one of these.
+ * They are allocated, the receiver must free them with
+ * ipmi_free_recv_msg() when done with the message. The link is not
+ * used after the message is delivered, so the upper layer may use the
+ * link to build a linked list, if it likes.
+ */
+struct ipmi_recv_msg {
+ struct list_head link;
+
+ /*
+ * The type of message as defined in the "Receive Types"
+ * defines above.
+ */
+ int recv_type;
+
+ struct ipmi_user *user;
+ struct ipmi_addr addr;
+ long msgid;
+ struct kernel_ipmi_msg msg;
+
+ /*
+ * The user_msg_data is the data supplied when a message was
+ * sent, if this is a response to a sent message. If this is
+ * not a response to a sent message, then user_msg_data will
+ * be NULL. If the user above is NULL, then this will be the
+ * intf.
+ */
+ void *user_msg_data;
+
+ /*
+ * Call this when done with the message. It will presumably free
+ * the message and do any other necessary cleanup.
+ */
+ void (*done)(struct ipmi_recv_msg *msg);
+
+ /*
+ * Place-holder for the data, don't make any assumptions about
+ * the size or existence of this, since it may change.
+ */
+ unsigned char msg_data[IPMI_MAX_MSG_LENGTH];
+};
+
+/* Allocate and free the receive message. */
+void ipmi_free_recv_msg(struct ipmi_recv_msg *msg);
+
+struct ipmi_user_hndl {
+ /*
+ * Routine type to call when a message needs to be routed to
+ * the upper layer. This will be called with some locks held,
+ * the only IPMI routines that can be called are ipmi_request
+ * and the alloc/free operations. The handler_data is the
+ * variable supplied when the receive handler was registered.
+ */
+ void (*ipmi_recv_hndl)(struct ipmi_recv_msg *msg,
+ void *user_msg_data);
+
+ /*
+ * Called when the interface detects a watchdog pre-timeout. If
+ * this is NULL, it will be ignored for the user.
+ */
+ void (*ipmi_watchdog_pretimeout)(void *handler_data);
+
+ /*
+ * If not NULL, called at panic time after the interface has
+ * been set up to handle run to completion.
+ */
+ void (*ipmi_panic_handler)(void *handler_data);
+
+ /*
+ * Called when the interface has been removed. After this returns
+ * the user handle will be invalid. The interface may or may
+ * not be usable when this is called, but it will return errors
+ * if it is not usable.
+ */
+ void (*shutdown)(void *handler_data);
+};
+
+/* Create a new user of the IPMI layer on the given interface number. */
+int ipmi_create_user(unsigned int if_num,
+ const struct ipmi_user_hndl *handler,
+ void *handler_data,
+ struct ipmi_user **user);
+
+/*
+ * Destroy the given user of the IPMI layer. Note that after this
+ * function returns, the system is guaranteed to not call any
+ * callbacks for the user. Thus as long as you destroy all the users
+ * before you unload a module, you will be safe. And if you destroy
+ * the users before you destroy the callback structures, it should be
+ * safe, too.
+ */
+int ipmi_destroy_user(struct ipmi_user *user);
+
+/* Get the IPMI version of the BMC we are talking to. */
+int ipmi_get_version(struct ipmi_user *user,
+ unsigned char *major,
+ unsigned char *minor);
+
+/*
+ * Set and get the slave address and LUN that we will use for our
+ * source messages. Note that this affects the interface, not just
+ * this user, so it will affect all users of this interface. This is
+ * so some initialization code can come in and do the OEM-specific
+ * things it takes to determine your address (if not the BMC) and set
+ * it for everyone else. Note that each channel can have its own
+ * address.
+ */
+int ipmi_set_my_address(struct ipmi_user *user,
+ unsigned int channel,
+ unsigned char address);
+int ipmi_get_my_address(struct ipmi_user *user,
+ unsigned int channel,
+ unsigned char *address);
+int ipmi_set_my_LUN(struct ipmi_user *user,
+ unsigned int channel,
+ unsigned char LUN);
+int ipmi_get_my_LUN(struct ipmi_user *user,
+ unsigned int channel,
+ unsigned char *LUN);
+
+/*
+ * Like ipmi_request, but lets you specify the number of retries and
+ * the retry time. The retries is the number of times the message
+ * will be resent if no reply is received. If set to -1, the default
+ * value will be used. The retry time is the time in milliseconds
+ * between retries. If set to zero, the default value will be
+ * used.
+ *
+ * Don't use this unless you *really* have to. It's primarily for the
+ * IPMI over LAN converter; since the LAN stuff does its own retries,
+ * it makes no sense to do it here. However, this can be used if you
+ * have unusual requirements.
+ */
+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 max_retries,
+ unsigned int retry_time_ms);
+
+/*
+ * Like ipmi_request, but with messages supplied. This will not
+ * allocate any memory, and the messages may be statically allocated
+ * (just make sure to do the "done" handling on them). Note that this
+ * is primarily for the watchdog timer, since it should be able to
+ * send messages even if no memory is available. This is subject to
+ * change as the system changes, so don't use it unless you REALLY
+ * have to.
+ */
+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);
+
+/*
+ * Poll the IPMI interface for the user. This causes the IPMI code to
+ * do an immediate check for information from the driver and handle
+ * anything that is immediately pending. This will not block in any
+ * way. This is useful if you need to spin waiting for something to
+ * happen in the IPMI driver.
+ */
+void ipmi_poll_interface(struct ipmi_user *user);
+
+/*
+ * When commands come in to the SMS, the user can register to receive
+ * them. Only one user can be listening on a specific netfn/cmd/chan tuple
+ * at a time, you will get an EBUSY error if the command is already
+ * registered. If a command is received that does not have a user
+ * registered, the driver will automatically return the proper
+ * error. Channels are specified as a bitfield, use IPMI_CHAN_ALL to
+ * mean all channels.
+ */
+int ipmi_register_for_cmd(struct ipmi_user *user,
+ unsigned char netfn,
+ unsigned char cmd,
+ unsigned int chans);
+int ipmi_unregister_for_cmd(struct ipmi_user *user,
+ unsigned char netfn,
+ unsigned char cmd,
+ unsigned int chans);
+
+/*
+ * Go into a mode where the driver will not autonomously attempt to do
+ * things with the interface. It will still respond to attentions and
+ * interrupts, and it will expect that commands will complete. It
+ * will not automatcially check for flags, events, or things of that
+ * nature.
+ *
+ * This is primarily used for firmware upgrades. The idea is that
+ * when you go into firmware upgrade mode, you do this operation
+ * and the driver will not attempt to do anything but what you tell
+ * it or what the BMC asks for.
+ *
+ * Note that if you send a command that resets the BMC, the driver
+ * will still expect a response from that command. So the BMC should
+ * reset itself *after* the response is sent. Resetting before the
+ * response is just silly.
+ *
+ * If in auto maintenance mode, the driver will automatically go into
+ * maintenance mode for 30 seconds if it sees a cold reset, a warm
+ * reset, or a firmware NetFN. This means that code that uses only
+ * firmware NetFN commands to do upgrades will work automatically
+ * without change, assuming it sends a message every 30 seconds or
+ * less.
+ *
+ * See the IPMI_MAINTENANCE_MODE_xxx defines for what the mode means.
+ */
+int ipmi_get_maintenance_mode(struct ipmi_user *user);
+int ipmi_set_maintenance_mode(struct ipmi_user *user, int mode);
+
+/*
+ * When the user is created, it will not receive IPMI events by
+ * default. The user must set this to TRUE to get incoming events.
+ * The first user that sets this to TRUE will receive all events that
+ * have been queued while no one was waiting for events.
+ */
+int ipmi_set_gets_events(struct ipmi_user *user, bool val);
+
+/*
+ * Called when a new SMI is registered. This will also be called on
+ * every existing interface when a new watcher is registered with
+ * ipmi_smi_watcher_register().
+ */
+struct ipmi_smi_watcher {
+ struct list_head link;
+
+ /*
+ * You must set the owner to the current module, if you are in
+ * a module (generally just set it to "THIS_MODULE").
+ */
+ struct module *owner;
+
+ /*
+ * These two are called with read locks held for the interface
+ * the watcher list. So you can add and remove users from the
+ * IPMI interface, send messages, etc., but you cannot add
+ * or remove SMI watchers or SMI interfaces.
+ */
+ void (*new_smi)(int if_num, struct device *dev);
+ void (*smi_gone)(int if_num);
+};
+
+int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher);
+int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher);
+
+/*
+ * The following are various helper functions for dealing with IPMI
+ * addresses.
+ */
+
+/* Return the maximum length of an IPMI address given it's type. */
+unsigned int ipmi_addr_length(int addr_type);
+
+/* Validate that the given IPMI address is valid. */
+int ipmi_validate_addr(struct ipmi_addr *addr, int len);
+
+/*
+ * How did the IPMI driver find out about the device?
+ */
+enum ipmi_addr_src {
+ SI_INVALID = 0, SI_HOTMOD, SI_HARDCODED, SI_SPMI, SI_ACPI, SI_SMBIOS,
+ SI_PCI, SI_DEVICETREE, SI_PLATFORM, SI_LAST
+};
+const char *ipmi_addr_src_to_str(enum ipmi_addr_src src);
+
+union ipmi_smi_info_union {
+#ifdef CONFIG_ACPI
+ /*
+ * the acpi_info element is defined for the SI_ACPI
+ * address type
+ */
+ struct {
+ acpi_handle acpi_handle;
+ } acpi_info;
+#endif
+};
+
+struct ipmi_smi_info {
+ enum ipmi_addr_src addr_src;
+
+ /*
+ * Base device for the interface. Don't forget to put this when
+ * you are done.
+ */
+ struct device *dev;
+
+ /*
+ * The addr_info provides more detailed info for some IPMI
+ * devices, depending on the addr_src. Currently only SI_ACPI
+ * info is provided.
+ */
+ union ipmi_smi_info_union addr_info;
+};
+
+/* This is to get the private info of struct ipmi_smi */
+extern int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data);
+
+#endif /* __LINUX_IPMI_H */