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2293 lines
59 KiB
2293 lines
59 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* ipmi_si.c |
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* |
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* The interface to the IPMI driver for the system interfaces (KCS, SMIC, |
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* BT). |
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* |
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* Author: MontaVista Software, Inc. |
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* Corey Minyard <[email protected]> |
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* [email protected] |
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* |
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* Copyright 2002 MontaVista Software Inc. |
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* Copyright 2006 IBM Corp., Christian Krafft <[email protected]> |
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*/ |
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|
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/* |
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* This file holds the "policy" for the interface to the SMI state |
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* machine. It does the configuration, handles timers and interrupts, |
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* and drives the real SMI state machine. |
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*/ |
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|
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#define pr_fmt(fmt) "ipmi_si: " fmt |
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|
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/sched.h> |
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#include <linux/seq_file.h> |
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#include <linux/timer.h> |
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#include <linux/errno.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/list.h> |
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#include <linux/notifier.h> |
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#include <linux/mutex.h> |
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#include <linux/kthread.h> |
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#include <asm/irq.h> |
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#include <linux/interrupt.h> |
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#include <linux/rcupdate.h> |
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#include <linux/ipmi.h> |
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#include <linux/ipmi_smi.h> |
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#include "ipmi_si.h" |
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#include "ipmi_si_sm.h" |
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#include <linux/string.h> |
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#include <linux/ctype.h> |
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|
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/* Measure times between events in the driver. */ |
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#undef DEBUG_TIMING |
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|
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/* Call every 10 ms. */ |
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#define SI_TIMEOUT_TIME_USEC 10000 |
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#define SI_USEC_PER_JIFFY (1000000/HZ) |
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#define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY) |
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#define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a |
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short timeout */ |
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|
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enum si_intf_state { |
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SI_NORMAL, |
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SI_GETTING_FLAGS, |
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SI_GETTING_EVENTS, |
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SI_CLEARING_FLAGS, |
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SI_GETTING_MESSAGES, |
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SI_CHECKING_ENABLES, |
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SI_SETTING_ENABLES |
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/* FIXME - add watchdog stuff. */ |
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}; |
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|
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/* Some BT-specific defines we need here. */ |
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#define IPMI_BT_INTMASK_REG 2 |
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#define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2 |
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#define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1 |
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|
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/* 'invalid' to allow a firmware-specified interface to be disabled */ |
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const char *const si_to_str[] = { "invalid", "kcs", "smic", "bt", NULL }; |
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|
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static bool initialized; |
|
|
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/* |
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* Indexes into stats[] in smi_info below. |
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*/ |
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enum si_stat_indexes { |
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/* |
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* Number of times the driver requested a timer while an operation |
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* was in progress. |
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*/ |
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SI_STAT_short_timeouts = 0, |
|
|
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/* |
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* Number of times the driver requested a timer while nothing was in |
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* progress. |
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*/ |
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SI_STAT_long_timeouts, |
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|
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/* Number of times the interface was idle while being polled. */ |
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SI_STAT_idles, |
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|
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/* Number of interrupts the driver handled. */ |
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SI_STAT_interrupts, |
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|
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/* Number of time the driver got an ATTN from the hardware. */ |
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SI_STAT_attentions, |
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|
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/* Number of times the driver requested flags from the hardware. */ |
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SI_STAT_flag_fetches, |
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|
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/* Number of times the hardware didn't follow the state machine. */ |
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SI_STAT_hosed_count, |
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|
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/* Number of completed messages. */ |
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SI_STAT_complete_transactions, |
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|
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/* Number of IPMI events received from the hardware. */ |
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SI_STAT_events, |
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|
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/* Number of watchdog pretimeouts. */ |
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SI_STAT_watchdog_pretimeouts, |
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|
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/* Number of asynchronous messages received. */ |
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SI_STAT_incoming_messages, |
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|
|
|
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/* This *must* remain last, add new values above this. */ |
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SI_NUM_STATS |
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}; |
|
|
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struct smi_info { |
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int si_num; |
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struct ipmi_smi *intf; |
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struct si_sm_data *si_sm; |
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const struct si_sm_handlers *handlers; |
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spinlock_t si_lock; |
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struct ipmi_smi_msg *waiting_msg; |
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struct ipmi_smi_msg *curr_msg; |
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enum si_intf_state si_state; |
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|
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/* |
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* Used to handle the various types of I/O that can occur with |
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* IPMI |
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*/ |
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struct si_sm_io io; |
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|
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/* |
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* Per-OEM handler, called from handle_flags(). Returns 1 |
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* when handle_flags() needs to be re-run or 0 indicating it |
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* set si_state itself. |
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*/ |
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int (*oem_data_avail_handler)(struct smi_info *smi_info); |
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|
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/* |
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* Flags from the last GET_MSG_FLAGS command, used when an ATTN |
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* is set to hold the flags until we are done handling everything |
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* from the flags. |
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*/ |
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#define RECEIVE_MSG_AVAIL 0x01 |
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#define EVENT_MSG_BUFFER_FULL 0x02 |
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#define WDT_PRE_TIMEOUT_INT 0x08 |
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#define OEM0_DATA_AVAIL 0x20 |
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#define OEM1_DATA_AVAIL 0x40 |
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#define OEM2_DATA_AVAIL 0x80 |
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#define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \ |
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OEM1_DATA_AVAIL | \ |
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OEM2_DATA_AVAIL) |
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unsigned char msg_flags; |
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|
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/* Does the BMC have an event buffer? */ |
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bool has_event_buffer; |
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|
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/* |
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* If set to true, this will request events the next time the |
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* state machine is idle. |
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*/ |
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atomic_t req_events; |
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|
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/* |
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* If true, run the state machine to completion on every send |
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* call. Generally used after a panic to make sure stuff goes |
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* out. |
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*/ |
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bool run_to_completion; |
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|
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/* The timer for this si. */ |
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struct timer_list si_timer; |
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|
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/* This flag is set, if the timer can be set */ |
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bool timer_can_start; |
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|
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/* This flag is set, if the timer is running (timer_pending() isn't enough) */ |
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bool timer_running; |
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|
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/* The time (in jiffies) the last timeout occurred at. */ |
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unsigned long last_timeout_jiffies; |
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|
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/* Are we waiting for the events, pretimeouts, received msgs? */ |
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atomic_t need_watch; |
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|
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/* |
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* The driver will disable interrupts when it gets into a |
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* situation where it cannot handle messages due to lack of |
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* memory. Once that situation clears up, it will re-enable |
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* interrupts. |
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*/ |
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bool interrupt_disabled; |
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|
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/* |
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* Does the BMC support events? |
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*/ |
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bool supports_event_msg_buff; |
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|
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/* |
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* Can we disable interrupts the global enables receive irq |
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* bit? There are currently two forms of brokenness, some |
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* systems cannot disable the bit (which is technically within |
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* the spec but a bad idea) and some systems have the bit |
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* forced to zero even though interrupts work (which is |
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* clearly outside the spec). The next bool tells which form |
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* of brokenness is present. |
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*/ |
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bool cannot_disable_irq; |
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|
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/* |
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* Some systems are broken and cannot set the irq enable |
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* bit, even if they support interrupts. |
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*/ |
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bool irq_enable_broken; |
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|
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/* Is the driver in maintenance mode? */ |
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bool in_maintenance_mode; |
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|
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/* |
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* Did we get an attention that we did not handle? |
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*/ |
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bool got_attn; |
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|
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/* From the get device id response... */ |
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struct ipmi_device_id device_id; |
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|
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/* Have we added the device group to the device? */ |
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bool dev_group_added; |
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|
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/* Counters and things for the proc filesystem. */ |
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atomic_t stats[SI_NUM_STATS]; |
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|
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struct task_struct *thread; |
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|
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struct list_head link; |
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}; |
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|
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#define smi_inc_stat(smi, stat) \ |
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atomic_inc(&(smi)->stats[SI_STAT_ ## stat]) |
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#define smi_get_stat(smi, stat) \ |
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((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat])) |
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|
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#define IPMI_MAX_INTFS 4 |
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static int force_kipmid[IPMI_MAX_INTFS]; |
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static int num_force_kipmid; |
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|
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static unsigned int kipmid_max_busy_us[IPMI_MAX_INTFS]; |
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static int num_max_busy_us; |
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|
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static bool unload_when_empty = true; |
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|
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static int try_smi_init(struct smi_info *smi); |
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static void cleanup_one_si(struct smi_info *smi_info); |
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static void cleanup_ipmi_si(void); |
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|
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#ifdef DEBUG_TIMING |
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void debug_timestamp(char *msg) |
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{ |
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struct timespec64 t; |
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|
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ktime_get_ts64(&t); |
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pr_debug("**%s: %lld.%9.9ld\n", msg, t.tv_sec, t.tv_nsec); |
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} |
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#else |
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#define debug_timestamp(x) |
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#endif |
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|
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static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list); |
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static int register_xaction_notifier(struct notifier_block *nb) |
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{ |
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return atomic_notifier_chain_register(&xaction_notifier_list, nb); |
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} |
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|
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static void deliver_recv_msg(struct smi_info *smi_info, |
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struct ipmi_smi_msg *msg) |
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{ |
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/* Deliver the message to the upper layer. */ |
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ipmi_smi_msg_received(smi_info->intf, msg); |
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} |
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|
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static void return_hosed_msg(struct smi_info *smi_info, int cCode) |
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{ |
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struct ipmi_smi_msg *msg = smi_info->curr_msg; |
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|
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if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED) |
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cCode = IPMI_ERR_UNSPECIFIED; |
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/* else use it as is */ |
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|
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/* Make it a response */ |
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msg->rsp[0] = msg->data[0] | 4; |
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msg->rsp[1] = msg->data[1]; |
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msg->rsp[2] = cCode; |
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msg->rsp_size = 3; |
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|
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smi_info->curr_msg = NULL; |
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deliver_recv_msg(smi_info, msg); |
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} |
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|
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static enum si_sm_result start_next_msg(struct smi_info *smi_info) |
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{ |
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int rv; |
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|
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if (!smi_info->waiting_msg) { |
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smi_info->curr_msg = NULL; |
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rv = SI_SM_IDLE; |
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} else { |
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int err; |
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|
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smi_info->curr_msg = smi_info->waiting_msg; |
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smi_info->waiting_msg = NULL; |
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debug_timestamp("Start2"); |
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err = atomic_notifier_call_chain(&xaction_notifier_list, |
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0, smi_info); |
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if (err & NOTIFY_STOP_MASK) { |
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rv = SI_SM_CALL_WITHOUT_DELAY; |
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goto out; |
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} |
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err = smi_info->handlers->start_transaction( |
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smi_info->si_sm, |
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smi_info->curr_msg->data, |
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smi_info->curr_msg->data_size); |
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if (err) |
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return_hosed_msg(smi_info, err); |
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|
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rv = SI_SM_CALL_WITHOUT_DELAY; |
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} |
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out: |
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return rv; |
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} |
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|
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static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val) |
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{ |
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if (!smi_info->timer_can_start) |
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return; |
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smi_info->last_timeout_jiffies = jiffies; |
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mod_timer(&smi_info->si_timer, new_val); |
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smi_info->timer_running = true; |
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} |
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|
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/* |
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* Start a new message and (re)start the timer and thread. |
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*/ |
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static void start_new_msg(struct smi_info *smi_info, unsigned char *msg, |
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unsigned int size) |
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{ |
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smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); |
|
|
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if (smi_info->thread) |
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wake_up_process(smi_info->thread); |
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|
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smi_info->handlers->start_transaction(smi_info->si_sm, msg, size); |
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} |
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|
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static void start_check_enables(struct smi_info *smi_info) |
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{ |
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unsigned char msg[2]; |
|
|
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msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
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msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; |
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|
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start_new_msg(smi_info, msg, 2); |
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smi_info->si_state = SI_CHECKING_ENABLES; |
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} |
|
|
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static void start_clear_flags(struct smi_info *smi_info) |
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{ |
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unsigned char msg[3]; |
|
|
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/* Make sure the watchdog pre-timeout flag is not set at startup. */ |
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msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
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msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; |
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msg[2] = WDT_PRE_TIMEOUT_INT; |
|
|
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start_new_msg(smi_info, msg, 3); |
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smi_info->si_state = SI_CLEARING_FLAGS; |
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} |
|
|
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static void start_getting_msg_queue(struct smi_info *smi_info) |
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{ |
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smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); |
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smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD; |
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smi_info->curr_msg->data_size = 2; |
|
|
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start_new_msg(smi_info, smi_info->curr_msg->data, |
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smi_info->curr_msg->data_size); |
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smi_info->si_state = SI_GETTING_MESSAGES; |
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} |
|
|
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static void start_getting_events(struct smi_info *smi_info) |
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{ |
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smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); |
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smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; |
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smi_info->curr_msg->data_size = 2; |
|
|
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start_new_msg(smi_info, smi_info->curr_msg->data, |
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smi_info->curr_msg->data_size); |
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smi_info->si_state = SI_GETTING_EVENTS; |
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} |
|
|
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/* |
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* When we have a situtaion where we run out of memory and cannot |
|
* allocate messages, we just leave them in the BMC and run the system |
|
* polled until we can allocate some memory. Once we have some |
|
* memory, we will re-enable the interrupt. |
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* |
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* Note that we cannot just use disable_irq(), since the interrupt may |
|
* be shared. |
|
*/ |
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static inline bool disable_si_irq(struct smi_info *smi_info) |
|
{ |
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if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
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smi_info->interrupt_disabled = true; |
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start_check_enables(smi_info); |
|
return true; |
|
} |
|
return false; |
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} |
|
|
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static inline bool enable_si_irq(struct smi_info *smi_info) |
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{ |
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if ((smi_info->io.irq) && (smi_info->interrupt_disabled)) { |
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smi_info->interrupt_disabled = false; |
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start_check_enables(smi_info); |
|
return true; |
|
} |
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return false; |
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} |
|
|
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/* |
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* Allocate a message. If unable to allocate, start the interrupt |
|
* disable process and return NULL. If able to allocate but |
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* interrupts are disabled, free the message and return NULL after |
|
* starting the interrupt enable process. |
|
*/ |
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static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info) |
|
{ |
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struct ipmi_smi_msg *msg; |
|
|
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msg = ipmi_alloc_smi_msg(); |
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if (!msg) { |
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if (!disable_si_irq(smi_info)) |
|
smi_info->si_state = SI_NORMAL; |
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} else if (enable_si_irq(smi_info)) { |
|
ipmi_free_smi_msg(msg); |
|
msg = NULL; |
|
} |
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return msg; |
|
} |
|
|
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static void handle_flags(struct smi_info *smi_info) |
|
{ |
|
retry: |
|
if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) { |
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/* Watchdog pre-timeout */ |
|
smi_inc_stat(smi_info, watchdog_pretimeouts); |
|
|
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start_clear_flags(smi_info); |
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smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; |
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ipmi_smi_watchdog_pretimeout(smi_info->intf); |
|
} else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) { |
|
/* Messages available. */ |
|
smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
|
if (!smi_info->curr_msg) |
|
return; |
|
|
|
start_getting_msg_queue(smi_info); |
|
} else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) { |
|
/* Events available. */ |
|
smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
|
if (!smi_info->curr_msg) |
|
return; |
|
|
|
start_getting_events(smi_info); |
|
} else if (smi_info->msg_flags & OEM_DATA_AVAIL && |
|
smi_info->oem_data_avail_handler) { |
|
if (smi_info->oem_data_avail_handler(smi_info)) |
|
goto retry; |
|
} else |
|
smi_info->si_state = SI_NORMAL; |
|
} |
|
|
|
/* |
|
* Global enables we care about. |
|
*/ |
|
#define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ |
|
IPMI_BMC_EVT_MSG_INTR) |
|
|
|
static u8 current_global_enables(struct smi_info *smi_info, u8 base, |
|
bool *irq_on) |
|
{ |
|
u8 enables = 0; |
|
|
|
if (smi_info->supports_event_msg_buff) |
|
enables |= IPMI_BMC_EVT_MSG_BUFF; |
|
|
|
if (((smi_info->io.irq && !smi_info->interrupt_disabled) || |
|
smi_info->cannot_disable_irq) && |
|
!smi_info->irq_enable_broken) |
|
enables |= IPMI_BMC_RCV_MSG_INTR; |
|
|
|
if (smi_info->supports_event_msg_buff && |
|
smi_info->io.irq && !smi_info->interrupt_disabled && |
|
!smi_info->irq_enable_broken) |
|
enables |= IPMI_BMC_EVT_MSG_INTR; |
|
|
|
*irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR); |
|
|
|
return enables; |
|
} |
|
|
|
static void check_bt_irq(struct smi_info *smi_info, bool irq_on) |
|
{ |
|
u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG); |
|
|
|
irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT; |
|
|
|
if ((bool)irqstate == irq_on) |
|
return; |
|
|
|
if (irq_on) |
|
smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, |
|
IPMI_BT_INTMASK_ENABLE_IRQ_BIT); |
|
else |
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smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0); |
|
} |
|
|
|
static void handle_transaction_done(struct smi_info *smi_info) |
|
{ |
|
struct ipmi_smi_msg *msg; |
|
|
|
debug_timestamp("Done"); |
|
switch (smi_info->si_state) { |
|
case SI_NORMAL: |
|
if (!smi_info->curr_msg) |
|
break; |
|
|
|
smi_info->curr_msg->rsp_size |
|
= smi_info->handlers->get_result( |
|
smi_info->si_sm, |
|
smi_info->curr_msg->rsp, |
|
IPMI_MAX_MSG_LENGTH); |
|
|
|
/* |
|
* Do this here becase deliver_recv_msg() releases the |
|
* lock, and a new message can be put in during the |
|
* time the lock is released. |
|
*/ |
|
msg = smi_info->curr_msg; |
|
smi_info->curr_msg = NULL; |
|
deliver_recv_msg(smi_info, msg); |
|
break; |
|
|
|
case SI_GETTING_FLAGS: |
|
{ |
|
unsigned char msg[4]; |
|
unsigned int len; |
|
|
|
/* We got the flags from the SMI, now handle them. */ |
|
len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4); |
|
if (msg[2] != 0) { |
|
/* Error fetching flags, just give up for now. */ |
|
smi_info->si_state = SI_NORMAL; |
|
} else if (len < 4) { |
|
/* |
|
* Hmm, no flags. That's technically illegal, but |
|
* don't use uninitialized data. |
|
*/ |
|
smi_info->si_state = SI_NORMAL; |
|
} else { |
|
smi_info->msg_flags = msg[3]; |
|
handle_flags(smi_info); |
|
} |
|
break; |
|
} |
|
|
|
case SI_CLEARING_FLAGS: |
|
{ |
|
unsigned char msg[3]; |
|
|
|
/* We cleared the flags. */ |
|
smi_info->handlers->get_result(smi_info->si_sm, msg, 3); |
|
if (msg[2] != 0) { |
|
/* Error clearing flags */ |
|
dev_warn_ratelimited(smi_info->io.dev, |
|
"Error clearing flags: %2.2x\n", msg[2]); |
|
} |
|
smi_info->si_state = SI_NORMAL; |
|
break; |
|
} |
|
|
|
case SI_GETTING_EVENTS: |
|
{ |
|
smi_info->curr_msg->rsp_size |
|
= smi_info->handlers->get_result( |
|
smi_info->si_sm, |
|
smi_info->curr_msg->rsp, |
|
IPMI_MAX_MSG_LENGTH); |
|
|
|
/* |
|
* Do this here becase deliver_recv_msg() releases the |
|
* lock, and a new message can be put in during the |
|
* time the lock is released. |
|
*/ |
|
msg = smi_info->curr_msg; |
|
smi_info->curr_msg = NULL; |
|
if (msg->rsp[2] != 0) { |
|
/* Error getting event, probably done. */ |
|
msg->done(msg); |
|
|
|
/* Take off the event flag. */ |
|
smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; |
|
handle_flags(smi_info); |
|
} else { |
|
smi_inc_stat(smi_info, events); |
|
|
|
/* |
|
* Do this before we deliver the message |
|
* because delivering the message releases the |
|
* lock and something else can mess with the |
|
* state. |
|
*/ |
|
handle_flags(smi_info); |
|
|
|
deliver_recv_msg(smi_info, msg); |
|
} |
|
break; |
|
} |
|
|
|
case SI_GETTING_MESSAGES: |
|
{ |
|
smi_info->curr_msg->rsp_size |
|
= smi_info->handlers->get_result( |
|
smi_info->si_sm, |
|
smi_info->curr_msg->rsp, |
|
IPMI_MAX_MSG_LENGTH); |
|
|
|
/* |
|
* Do this here becase deliver_recv_msg() releases the |
|
* lock, and a new message can be put in during the |
|
* time the lock is released. |
|
*/ |
|
msg = smi_info->curr_msg; |
|
smi_info->curr_msg = NULL; |
|
if (msg->rsp[2] != 0) { |
|
/* Error getting event, probably done. */ |
|
msg->done(msg); |
|
|
|
/* Take off the msg flag. */ |
|
smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL; |
|
handle_flags(smi_info); |
|
} else { |
|
smi_inc_stat(smi_info, incoming_messages); |
|
|
|
/* |
|
* Do this before we deliver the message |
|
* because delivering the message releases the |
|
* lock and something else can mess with the |
|
* state. |
|
*/ |
|
handle_flags(smi_info); |
|
|
|
deliver_recv_msg(smi_info, msg); |
|
} |
|
break; |
|
} |
|
|
|
case SI_CHECKING_ENABLES: |
|
{ |
|
unsigned char msg[4]; |
|
u8 enables; |
|
bool irq_on; |
|
|
|
/* We got the flags from the SMI, now handle them. */ |
|
smi_info->handlers->get_result(smi_info->si_sm, msg, 4); |
|
if (msg[2] != 0) { |
|
dev_warn_ratelimited(smi_info->io.dev, |
|
"Couldn't get irq info: %x,\n" |
|
"Maybe ok, but ipmi might run very slowly.\n", |
|
msg[2]); |
|
smi_info->si_state = SI_NORMAL; |
|
break; |
|
} |
|
enables = current_global_enables(smi_info, 0, &irq_on); |
|
if (smi_info->io.si_type == SI_BT) |
|
/* BT has its own interrupt enable bit. */ |
|
check_bt_irq(smi_info, irq_on); |
|
if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) { |
|
/* Enables are not correct, fix them. */ |
|
msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
|
msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; |
|
msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK); |
|
smi_info->handlers->start_transaction( |
|
smi_info->si_sm, msg, 3); |
|
smi_info->si_state = SI_SETTING_ENABLES; |
|
} else if (smi_info->supports_event_msg_buff) { |
|
smi_info->curr_msg = ipmi_alloc_smi_msg(); |
|
if (!smi_info->curr_msg) { |
|
smi_info->si_state = SI_NORMAL; |
|
break; |
|
} |
|
start_getting_events(smi_info); |
|
} else { |
|
smi_info->si_state = SI_NORMAL; |
|
} |
|
break; |
|
} |
|
|
|
case SI_SETTING_ENABLES: |
|
{ |
|
unsigned char msg[4]; |
|
|
|
smi_info->handlers->get_result(smi_info->si_sm, msg, 4); |
|
if (msg[2] != 0) |
|
dev_warn_ratelimited(smi_info->io.dev, |
|
"Could not set the global enables: 0x%x.\n", |
|
msg[2]); |
|
|
|
if (smi_info->supports_event_msg_buff) { |
|
smi_info->curr_msg = ipmi_alloc_smi_msg(); |
|
if (!smi_info->curr_msg) { |
|
smi_info->si_state = SI_NORMAL; |
|
break; |
|
} |
|
start_getting_events(smi_info); |
|
} else { |
|
smi_info->si_state = SI_NORMAL; |
|
} |
|
break; |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* Called on timeouts and events. Timeouts should pass the elapsed |
|
* time, interrupts should pass in zero. Must be called with |
|
* si_lock held and interrupts disabled. |
|
*/ |
|
static enum si_sm_result smi_event_handler(struct smi_info *smi_info, |
|
int time) |
|
{ |
|
enum si_sm_result si_sm_result; |
|
|
|
restart: |
|
/* |
|
* There used to be a loop here that waited a little while |
|
* (around 25us) before giving up. That turned out to be |
|
* pointless, the minimum delays I was seeing were in the 300us |
|
* range, which is far too long to wait in an interrupt. So |
|
* we just run until the state machine tells us something |
|
* happened or it needs a delay. |
|
*/ |
|
si_sm_result = smi_info->handlers->event(smi_info->si_sm, time); |
|
time = 0; |
|
while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY) |
|
si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); |
|
|
|
if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) { |
|
smi_inc_stat(smi_info, complete_transactions); |
|
|
|
handle_transaction_done(smi_info); |
|
goto restart; |
|
} else if (si_sm_result == SI_SM_HOSED) { |
|
smi_inc_stat(smi_info, hosed_count); |
|
|
|
/* |
|
* Do the before return_hosed_msg, because that |
|
* releases the lock. |
|
*/ |
|
smi_info->si_state = SI_NORMAL; |
|
if (smi_info->curr_msg != NULL) { |
|
/* |
|
* If we were handling a user message, format |
|
* a response to send to the upper layer to |
|
* tell it about the error. |
|
*/ |
|
return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED); |
|
} |
|
goto restart; |
|
} |
|
|
|
/* |
|
* We prefer handling attn over new messages. But don't do |
|
* this if there is not yet an upper layer to handle anything. |
|
*/ |
|
if (si_sm_result == SI_SM_ATTN || smi_info->got_attn) { |
|
unsigned char msg[2]; |
|
|
|
if (smi_info->si_state != SI_NORMAL) { |
|
/* |
|
* We got an ATTN, but we are doing something else. |
|
* Handle the ATTN later. |
|
*/ |
|
smi_info->got_attn = true; |
|
} else { |
|
smi_info->got_attn = false; |
|
smi_inc_stat(smi_info, attentions); |
|
|
|
/* |
|
* Got a attn, send down a get message flags to see |
|
* what's causing it. It would be better to handle |
|
* this in the upper layer, but due to the way |
|
* interrupts work with the SMI, that's not really |
|
* possible. |
|
*/ |
|
msg[0] = (IPMI_NETFN_APP_REQUEST << 2); |
|
msg[1] = IPMI_GET_MSG_FLAGS_CMD; |
|
|
|
start_new_msg(smi_info, msg, 2); |
|
smi_info->si_state = SI_GETTING_FLAGS; |
|
goto restart; |
|
} |
|
} |
|
|
|
/* If we are currently idle, try to start the next message. */ |
|
if (si_sm_result == SI_SM_IDLE) { |
|
smi_inc_stat(smi_info, idles); |
|
|
|
si_sm_result = start_next_msg(smi_info); |
|
if (si_sm_result != SI_SM_IDLE) |
|
goto restart; |
|
} |
|
|
|
if ((si_sm_result == SI_SM_IDLE) |
|
&& (atomic_read(&smi_info->req_events))) { |
|
/* |
|
* We are idle and the upper layer requested that I fetch |
|
* events, so do so. |
|
*/ |
|
atomic_set(&smi_info->req_events, 0); |
|
|
|
/* |
|
* Take this opportunity to check the interrupt and |
|
* message enable state for the BMC. The BMC can be |
|
* asynchronously reset, and may thus get interrupts |
|
* disable and messages disabled. |
|
*/ |
|
if (smi_info->supports_event_msg_buff || smi_info->io.irq) { |
|
start_check_enables(smi_info); |
|
} else { |
|
smi_info->curr_msg = alloc_msg_handle_irq(smi_info); |
|
if (!smi_info->curr_msg) |
|
goto out; |
|
|
|
start_getting_events(smi_info); |
|
} |
|
goto restart; |
|
} |
|
|
|
if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) { |
|
/* Ok it if fails, the timer will just go off. */ |
|
if (del_timer(&smi_info->si_timer)) |
|
smi_info->timer_running = false; |
|
} |
|
|
|
out: |
|
return si_sm_result; |
|
} |
|
|
|
static void check_start_timer_thread(struct smi_info *smi_info) |
|
{ |
|
if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) { |
|
smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); |
|
|
|
if (smi_info->thread) |
|
wake_up_process(smi_info->thread); |
|
|
|
start_next_msg(smi_info); |
|
smi_event_handler(smi_info, 0); |
|
} |
|
} |
|
|
|
static void flush_messages(void *send_info) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
enum si_sm_result result; |
|
|
|
/* |
|
* Currently, this function is called only in run-to-completion |
|
* mode. This means we are single-threaded, no need for locks. |
|
*/ |
|
result = smi_event_handler(smi_info, 0); |
|
while (result != SI_SM_IDLE) { |
|
udelay(SI_SHORT_TIMEOUT_USEC); |
|
result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC); |
|
} |
|
} |
|
|
|
static void sender(void *send_info, |
|
struct ipmi_smi_msg *msg) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
unsigned long flags; |
|
|
|
debug_timestamp("Enqueue"); |
|
|
|
if (smi_info->run_to_completion) { |
|
/* |
|
* If we are running to completion, start it. Upper |
|
* layer will call flush_messages to clear it out. |
|
*/ |
|
smi_info->waiting_msg = msg; |
|
return; |
|
} |
|
|
|
spin_lock_irqsave(&smi_info->si_lock, flags); |
|
/* |
|
* The following two lines don't need to be under the lock for |
|
* the lock's sake, but they do need SMP memory barriers to |
|
* avoid getting things out of order. We are already claiming |
|
* the lock, anyway, so just do it under the lock to avoid the |
|
* ordering problem. |
|
*/ |
|
BUG_ON(smi_info->waiting_msg); |
|
smi_info->waiting_msg = msg; |
|
check_start_timer_thread(smi_info); |
|
spin_unlock_irqrestore(&smi_info->si_lock, flags); |
|
} |
|
|
|
static void set_run_to_completion(void *send_info, bool i_run_to_completion) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
|
|
smi_info->run_to_completion = i_run_to_completion; |
|
if (i_run_to_completion) |
|
flush_messages(smi_info); |
|
} |
|
|
|
/* |
|
* Use -1 as a special constant to tell that we are spinning in kipmid |
|
* looking for something and not delaying between checks |
|
*/ |
|
#define IPMI_TIME_NOT_BUSY ns_to_ktime(-1ull) |
|
static inline bool ipmi_thread_busy_wait(enum si_sm_result smi_result, |
|
const struct smi_info *smi_info, |
|
ktime_t *busy_until) |
|
{ |
|
unsigned int max_busy_us = 0; |
|
|
|
if (smi_info->si_num < num_max_busy_us) |
|
max_busy_us = kipmid_max_busy_us[smi_info->si_num]; |
|
if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY) |
|
*busy_until = IPMI_TIME_NOT_BUSY; |
|
else if (*busy_until == IPMI_TIME_NOT_BUSY) { |
|
*busy_until = ktime_get() + max_busy_us * NSEC_PER_USEC; |
|
} else { |
|
if (unlikely(ktime_get() > *busy_until)) { |
|
*busy_until = IPMI_TIME_NOT_BUSY; |
|
return false; |
|
} |
|
} |
|
return true; |
|
} |
|
|
|
|
|
/* |
|
* A busy-waiting loop for speeding up IPMI operation. |
|
* |
|
* Lousy hardware makes this hard. This is only enabled for systems |
|
* that are not BT and do not have interrupts. It starts spinning |
|
* when an operation is complete or until max_busy tells it to stop |
|
* (if that is enabled). See the paragraph on kimid_max_busy_us in |
|
* Documentation/driver-api/ipmi.rst for details. |
|
*/ |
|
static int ipmi_thread(void *data) |
|
{ |
|
struct smi_info *smi_info = data; |
|
unsigned long flags; |
|
enum si_sm_result smi_result; |
|
ktime_t busy_until = IPMI_TIME_NOT_BUSY; |
|
|
|
set_user_nice(current, MAX_NICE); |
|
while (!kthread_should_stop()) { |
|
int busy_wait; |
|
|
|
spin_lock_irqsave(&(smi_info->si_lock), flags); |
|
smi_result = smi_event_handler(smi_info, 0); |
|
|
|
/* |
|
* If the driver is doing something, there is a possible |
|
* race with the timer. If the timer handler see idle, |
|
* and the thread here sees something else, the timer |
|
* handler won't restart the timer even though it is |
|
* required. So start it here if necessary. |
|
*/ |
|
if (smi_result != SI_SM_IDLE && !smi_info->timer_running) |
|
smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); |
|
|
|
spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
|
busy_wait = ipmi_thread_busy_wait(smi_result, smi_info, |
|
&busy_until); |
|
if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
|
; /* do nothing */ |
|
} else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait) { |
|
/* |
|
* In maintenance mode we run as fast as |
|
* possible to allow firmware updates to |
|
* complete as fast as possible, but normally |
|
* don't bang on the scheduler. |
|
*/ |
|
if (smi_info->in_maintenance_mode) |
|
schedule(); |
|
else |
|
usleep_range(100, 200); |
|
} else if (smi_result == SI_SM_IDLE) { |
|
if (atomic_read(&smi_info->need_watch)) { |
|
schedule_timeout_interruptible(100); |
|
} else { |
|
/* Wait to be woken up when we are needed. */ |
|
__set_current_state(TASK_INTERRUPTIBLE); |
|
schedule(); |
|
} |
|
} else { |
|
schedule_timeout_interruptible(1); |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
|
|
static void poll(void *send_info) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
unsigned long flags = 0; |
|
bool run_to_completion = smi_info->run_to_completion; |
|
|
|
/* |
|
* Make sure there is some delay in the poll loop so we can |
|
* drive time forward and timeout things. |
|
*/ |
|
udelay(10); |
|
if (!run_to_completion) |
|
spin_lock_irqsave(&smi_info->si_lock, flags); |
|
smi_event_handler(smi_info, 10); |
|
if (!run_to_completion) |
|
spin_unlock_irqrestore(&smi_info->si_lock, flags); |
|
} |
|
|
|
static void request_events(void *send_info) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
|
|
if (!smi_info->has_event_buffer) |
|
return; |
|
|
|
atomic_set(&smi_info->req_events, 1); |
|
} |
|
|
|
static void set_need_watch(void *send_info, unsigned int watch_mask) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
unsigned long flags; |
|
int enable; |
|
|
|
enable = !!watch_mask; |
|
|
|
atomic_set(&smi_info->need_watch, enable); |
|
spin_lock_irqsave(&smi_info->si_lock, flags); |
|
check_start_timer_thread(smi_info); |
|
spin_unlock_irqrestore(&smi_info->si_lock, flags); |
|
} |
|
|
|
static void smi_timeout(struct timer_list *t) |
|
{ |
|
struct smi_info *smi_info = from_timer(smi_info, t, si_timer); |
|
enum si_sm_result smi_result; |
|
unsigned long flags; |
|
unsigned long jiffies_now; |
|
long time_diff; |
|
long timeout; |
|
|
|
spin_lock_irqsave(&(smi_info->si_lock), flags); |
|
debug_timestamp("Timer"); |
|
|
|
jiffies_now = jiffies; |
|
time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) |
|
* SI_USEC_PER_JIFFY); |
|
smi_result = smi_event_handler(smi_info, time_diff); |
|
|
|
if ((smi_info->io.irq) && (!smi_info->interrupt_disabled)) { |
|
/* Running with interrupts, only do long timeouts. */ |
|
timeout = jiffies + SI_TIMEOUT_JIFFIES; |
|
smi_inc_stat(smi_info, long_timeouts); |
|
goto do_mod_timer; |
|
} |
|
|
|
/* |
|
* If the state machine asks for a short delay, then shorten |
|
* the timer timeout. |
|
*/ |
|
if (smi_result == SI_SM_CALL_WITH_DELAY) { |
|
smi_inc_stat(smi_info, short_timeouts); |
|
timeout = jiffies + 1; |
|
} else { |
|
smi_inc_stat(smi_info, long_timeouts); |
|
timeout = jiffies + SI_TIMEOUT_JIFFIES; |
|
} |
|
|
|
do_mod_timer: |
|
if (smi_result != SI_SM_IDLE) |
|
smi_mod_timer(smi_info, timeout); |
|
else |
|
smi_info->timer_running = false; |
|
spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
|
} |
|
|
|
irqreturn_t ipmi_si_irq_handler(int irq, void *data) |
|
{ |
|
struct smi_info *smi_info = data; |
|
unsigned long flags; |
|
|
|
if (smi_info->io.si_type == SI_BT) |
|
/* We need to clear the IRQ flag for the BT interface. */ |
|
smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, |
|
IPMI_BT_INTMASK_CLEAR_IRQ_BIT |
|
| IPMI_BT_INTMASK_ENABLE_IRQ_BIT); |
|
|
|
spin_lock_irqsave(&(smi_info->si_lock), flags); |
|
|
|
smi_inc_stat(smi_info, interrupts); |
|
|
|
debug_timestamp("Interrupt"); |
|
|
|
smi_event_handler(smi_info, 0); |
|
spin_unlock_irqrestore(&(smi_info->si_lock), flags); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int smi_start_processing(void *send_info, |
|
struct ipmi_smi *intf) |
|
{ |
|
struct smi_info *new_smi = send_info; |
|
int enable = 0; |
|
|
|
new_smi->intf = intf; |
|
|
|
/* Set up the timer that drives the interface. */ |
|
timer_setup(&new_smi->si_timer, smi_timeout, 0); |
|
new_smi->timer_can_start = true; |
|
smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES); |
|
|
|
/* Try to claim any interrupts. */ |
|
if (new_smi->io.irq_setup) { |
|
new_smi->io.irq_handler_data = new_smi; |
|
new_smi->io.irq_setup(&new_smi->io); |
|
} |
|
|
|
/* |
|
* Check if the user forcefully enabled the daemon. |
|
*/ |
|
if (new_smi->si_num < num_force_kipmid) |
|
enable = force_kipmid[new_smi->si_num]; |
|
/* |
|
* The BT interface is efficient enough to not need a thread, |
|
* and there is no need for a thread if we have interrupts. |
|
*/ |
|
else if ((new_smi->io.si_type != SI_BT) && (!new_smi->io.irq)) |
|
enable = 1; |
|
|
|
if (enable) { |
|
new_smi->thread = kthread_run(ipmi_thread, new_smi, |
|
"kipmi%d", new_smi->si_num); |
|
if (IS_ERR(new_smi->thread)) { |
|
dev_notice(new_smi->io.dev, |
|
"Could not start kernel thread due to error %ld, only using timers to drive the interface\n", |
|
PTR_ERR(new_smi->thread)); |
|
new_smi->thread = NULL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int get_smi_info(void *send_info, struct ipmi_smi_info *data) |
|
{ |
|
struct smi_info *smi = send_info; |
|
|
|
data->addr_src = smi->io.addr_source; |
|
data->dev = smi->io.dev; |
|
data->addr_info = smi->io.addr_info; |
|
get_device(smi->io.dev); |
|
|
|
return 0; |
|
} |
|
|
|
static void set_maintenance_mode(void *send_info, bool enable) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
|
|
if (!enable) |
|
atomic_set(&smi_info->req_events, 0); |
|
smi_info->in_maintenance_mode = enable; |
|
} |
|
|
|
static void shutdown_smi(void *send_info); |
|
static const struct ipmi_smi_handlers handlers = { |
|
.owner = THIS_MODULE, |
|
.start_processing = smi_start_processing, |
|
.shutdown = shutdown_smi, |
|
.get_smi_info = get_smi_info, |
|
.sender = sender, |
|
.request_events = request_events, |
|
.set_need_watch = set_need_watch, |
|
.set_maintenance_mode = set_maintenance_mode, |
|
.set_run_to_completion = set_run_to_completion, |
|
.flush_messages = flush_messages, |
|
.poll = poll, |
|
}; |
|
|
|
static LIST_HEAD(smi_infos); |
|
static DEFINE_MUTEX(smi_infos_lock); |
|
static int smi_num; /* Used to sequence the SMIs */ |
|
|
|
static const char * const addr_space_to_str[] = { "i/o", "mem" }; |
|
|
|
module_param_array(force_kipmid, int, &num_force_kipmid, 0); |
|
MODULE_PARM_DESC(force_kipmid, |
|
"Force the kipmi daemon to be enabled (1) or disabled(0). Normally the IPMI driver auto-detects this, but the value may be overridden by this parm."); |
|
module_param(unload_when_empty, bool, 0); |
|
MODULE_PARM_DESC(unload_when_empty, |
|
"Unload the module if no interfaces are specified or found, default is 1. Setting to 0 is useful for hot add of devices using hotmod."); |
|
module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644); |
|
MODULE_PARM_DESC(kipmid_max_busy_us, |
|
"Max time (in microseconds) to busy-wait for IPMI data before sleeping. 0 (default) means to wait forever. Set to 100-500 if kipmid is using up a lot of CPU time."); |
|
|
|
void ipmi_irq_finish_setup(struct si_sm_io *io) |
|
{ |
|
if (io->si_type == SI_BT) |
|
/* Enable the interrupt in the BT interface. */ |
|
io->outputb(io, IPMI_BT_INTMASK_REG, |
|
IPMI_BT_INTMASK_ENABLE_IRQ_BIT); |
|
} |
|
|
|
void ipmi_irq_start_cleanup(struct si_sm_io *io) |
|
{ |
|
if (io->si_type == SI_BT) |
|
/* Disable the interrupt in the BT interface. */ |
|
io->outputb(io, IPMI_BT_INTMASK_REG, 0); |
|
} |
|
|
|
static void std_irq_cleanup(struct si_sm_io *io) |
|
{ |
|
ipmi_irq_start_cleanup(io); |
|
free_irq(io->irq, io->irq_handler_data); |
|
} |
|
|
|
int ipmi_std_irq_setup(struct si_sm_io *io) |
|
{ |
|
int rv; |
|
|
|
if (!io->irq) |
|
return 0; |
|
|
|
rv = request_irq(io->irq, |
|
ipmi_si_irq_handler, |
|
IRQF_SHARED, |
|
SI_DEVICE_NAME, |
|
io->irq_handler_data); |
|
if (rv) { |
|
dev_warn(io->dev, "%s unable to claim interrupt %d, running polled\n", |
|
SI_DEVICE_NAME, io->irq); |
|
io->irq = 0; |
|
} else { |
|
io->irq_cleanup = std_irq_cleanup; |
|
ipmi_irq_finish_setup(io); |
|
dev_info(io->dev, "Using irq %d\n", io->irq); |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
static int wait_for_msg_done(struct smi_info *smi_info) |
|
{ |
|
enum si_sm_result smi_result; |
|
|
|
smi_result = smi_info->handlers->event(smi_info->si_sm, 0); |
|
for (;;) { |
|
if (smi_result == SI_SM_CALL_WITH_DELAY || |
|
smi_result == SI_SM_CALL_WITH_TICK_DELAY) { |
|
schedule_timeout_uninterruptible(1); |
|
smi_result = smi_info->handlers->event( |
|
smi_info->si_sm, jiffies_to_usecs(1)); |
|
} else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { |
|
smi_result = smi_info->handlers->event( |
|
smi_info->si_sm, 0); |
|
} else |
|
break; |
|
} |
|
if (smi_result == SI_SM_HOSED) |
|
/* |
|
* We couldn't get the state machine to run, so whatever's at |
|
* the port is probably not an IPMI SMI interface. |
|
*/ |
|
return -ENODEV; |
|
|
|
return 0; |
|
} |
|
|
|
static int try_get_dev_id(struct smi_info *smi_info) |
|
{ |
|
unsigned char msg[2]; |
|
unsigned char *resp; |
|
unsigned long resp_len; |
|
int rv = 0; |
|
unsigned int retry_count = 0; |
|
|
|
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
|
if (!resp) |
|
return -ENOMEM; |
|
|
|
/* |
|
* Do a Get Device ID command, since it comes back with some |
|
* useful info. |
|
*/ |
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
|
msg[1] = IPMI_GET_DEVICE_ID_CMD; |
|
|
|
retry: |
|
smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); |
|
|
|
rv = wait_for_msg_done(smi_info); |
|
if (rv) |
|
goto out; |
|
|
|
resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
|
resp, IPMI_MAX_MSG_LENGTH); |
|
|
|
/* Check and record info from the get device id, in case we need it. */ |
|
rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1], |
|
resp + 2, resp_len - 2, &smi_info->device_id); |
|
if (rv) { |
|
/* record completion code */ |
|
unsigned char cc = *(resp + 2); |
|
|
|
if (cc != IPMI_CC_NO_ERROR && |
|
++retry_count <= GET_DEVICE_ID_MAX_RETRY) { |
|
dev_warn_ratelimited(smi_info->io.dev, |
|
"BMC returned 0x%2.2x, retry get bmc device id\n", |
|
cc); |
|
goto retry; |
|
} |
|
} |
|
|
|
out: |
|
kfree(resp); |
|
return rv; |
|
} |
|
|
|
static int get_global_enables(struct smi_info *smi_info, u8 *enables) |
|
{ |
|
unsigned char msg[3]; |
|
unsigned char *resp; |
|
unsigned long resp_len; |
|
int rv; |
|
|
|
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
|
if (!resp) |
|
return -ENOMEM; |
|
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
|
msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; |
|
smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); |
|
|
|
rv = wait_for_msg_done(smi_info); |
|
if (rv) { |
|
dev_warn(smi_info->io.dev, |
|
"Error getting response from get global enables command: %d\n", |
|
rv); |
|
goto out; |
|
} |
|
|
|
resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
|
resp, IPMI_MAX_MSG_LENGTH); |
|
|
|
if (resp_len < 4 || |
|
resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || |
|
resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || |
|
resp[2] != 0) { |
|
dev_warn(smi_info->io.dev, |
|
"Invalid return from get global enables command: %ld %x %x %x\n", |
|
resp_len, resp[0], resp[1], resp[2]); |
|
rv = -EINVAL; |
|
goto out; |
|
} else { |
|
*enables = resp[3]; |
|
} |
|
|
|
out: |
|
kfree(resp); |
|
return rv; |
|
} |
|
|
|
/* |
|
* Returns 1 if it gets an error from the command. |
|
*/ |
|
static int set_global_enables(struct smi_info *smi_info, u8 enables) |
|
{ |
|
unsigned char msg[3]; |
|
unsigned char *resp; |
|
unsigned long resp_len; |
|
int rv; |
|
|
|
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
|
if (!resp) |
|
return -ENOMEM; |
|
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
|
msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; |
|
msg[2] = enables; |
|
smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); |
|
|
|
rv = wait_for_msg_done(smi_info); |
|
if (rv) { |
|
dev_warn(smi_info->io.dev, |
|
"Error getting response from set global enables command: %d\n", |
|
rv); |
|
goto out; |
|
} |
|
|
|
resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
|
resp, IPMI_MAX_MSG_LENGTH); |
|
|
|
if (resp_len < 3 || |
|
resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || |
|
resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { |
|
dev_warn(smi_info->io.dev, |
|
"Invalid return from set global enables command: %ld %x %x\n", |
|
resp_len, resp[0], resp[1]); |
|
rv = -EINVAL; |
|
goto out; |
|
} |
|
|
|
if (resp[2] != 0) |
|
rv = 1; |
|
|
|
out: |
|
kfree(resp); |
|
return rv; |
|
} |
|
|
|
/* |
|
* Some BMCs do not support clearing the receive irq bit in the global |
|
* enables (even if they don't support interrupts on the BMC). Check |
|
* for this and handle it properly. |
|
*/ |
|
static void check_clr_rcv_irq(struct smi_info *smi_info) |
|
{ |
|
u8 enables = 0; |
|
int rv; |
|
|
|
rv = get_global_enables(smi_info, &enables); |
|
if (!rv) { |
|
if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0) |
|
/* Already clear, should work ok. */ |
|
return; |
|
|
|
enables &= ~IPMI_BMC_RCV_MSG_INTR; |
|
rv = set_global_enables(smi_info, enables); |
|
} |
|
|
|
if (rv < 0) { |
|
dev_err(smi_info->io.dev, |
|
"Cannot check clearing the rcv irq: %d\n", rv); |
|
return; |
|
} |
|
|
|
if (rv) { |
|
/* |
|
* An error when setting the event buffer bit means |
|
* clearing the bit is not supported. |
|
*/ |
|
dev_warn(smi_info->io.dev, |
|
"The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
|
smi_info->cannot_disable_irq = true; |
|
} |
|
} |
|
|
|
/* |
|
* Some BMCs do not support setting the interrupt bits in the global |
|
* enables even if they support interrupts. Clearly bad, but we can |
|
* compensate. |
|
*/ |
|
static void check_set_rcv_irq(struct smi_info *smi_info) |
|
{ |
|
u8 enables = 0; |
|
int rv; |
|
|
|
if (!smi_info->io.irq) |
|
return; |
|
|
|
rv = get_global_enables(smi_info, &enables); |
|
if (!rv) { |
|
enables |= IPMI_BMC_RCV_MSG_INTR; |
|
rv = set_global_enables(smi_info, enables); |
|
} |
|
|
|
if (rv < 0) { |
|
dev_err(smi_info->io.dev, |
|
"Cannot check setting the rcv irq: %d\n", rv); |
|
return; |
|
} |
|
|
|
if (rv) { |
|
/* |
|
* An error when setting the event buffer bit means |
|
* setting the bit is not supported. |
|
*/ |
|
dev_warn(smi_info->io.dev, |
|
"The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n"); |
|
smi_info->cannot_disable_irq = true; |
|
smi_info->irq_enable_broken = true; |
|
} |
|
} |
|
|
|
static int try_enable_event_buffer(struct smi_info *smi_info) |
|
{ |
|
unsigned char msg[3]; |
|
unsigned char *resp; |
|
unsigned long resp_len; |
|
int rv = 0; |
|
|
|
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
|
if (!resp) |
|
return -ENOMEM; |
|
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
|
msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; |
|
smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); |
|
|
|
rv = wait_for_msg_done(smi_info); |
|
if (rv) { |
|
pr_warn("Error getting response from get global enables command, the event buffer is not enabled\n"); |
|
goto out; |
|
} |
|
|
|
resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
|
resp, IPMI_MAX_MSG_LENGTH); |
|
|
|
if (resp_len < 4 || |
|
resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || |
|
resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || |
|
resp[2] != 0) { |
|
pr_warn("Invalid return from get global enables command, cannot enable the event buffer\n"); |
|
rv = -EINVAL; |
|
goto out; |
|
} |
|
|
|
if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { |
|
/* buffer is already enabled, nothing to do. */ |
|
smi_info->supports_event_msg_buff = true; |
|
goto out; |
|
} |
|
|
|
msg[0] = IPMI_NETFN_APP_REQUEST << 2; |
|
msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; |
|
msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; |
|
smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); |
|
|
|
rv = wait_for_msg_done(smi_info); |
|
if (rv) { |
|
pr_warn("Error getting response from set global, enables command, the event buffer is not enabled\n"); |
|
goto out; |
|
} |
|
|
|
resp_len = smi_info->handlers->get_result(smi_info->si_sm, |
|
resp, IPMI_MAX_MSG_LENGTH); |
|
|
|
if (resp_len < 3 || |
|
resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || |
|
resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { |
|
pr_warn("Invalid return from get global, enables command, not enable the event buffer\n"); |
|
rv = -EINVAL; |
|
goto out; |
|
} |
|
|
|
if (resp[2] != 0) |
|
/* |
|
* An error when setting the event buffer bit means |
|
* that the event buffer is not supported. |
|
*/ |
|
rv = -ENOENT; |
|
else |
|
smi_info->supports_event_msg_buff = true; |
|
|
|
out: |
|
kfree(resp); |
|
return rv; |
|
} |
|
|
|
#define IPMI_SI_ATTR(name) \ |
|
static ssize_t name##_show(struct device *dev, \ |
|
struct device_attribute *attr, \ |
|
char *buf) \ |
|
{ \ |
|
struct smi_info *smi_info = dev_get_drvdata(dev); \ |
|
\ |
|
return snprintf(buf, 10, "%u\n", smi_get_stat(smi_info, name)); \ |
|
} \ |
|
static DEVICE_ATTR_RO(name) |
|
|
|
static ssize_t type_show(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct smi_info *smi_info = dev_get_drvdata(dev); |
|
|
|
return snprintf(buf, 10, "%s\n", si_to_str[smi_info->io.si_type]); |
|
} |
|
static DEVICE_ATTR_RO(type); |
|
|
|
static ssize_t interrupts_enabled_show(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct smi_info *smi_info = dev_get_drvdata(dev); |
|
int enabled = smi_info->io.irq && !smi_info->interrupt_disabled; |
|
|
|
return snprintf(buf, 10, "%d\n", enabled); |
|
} |
|
static DEVICE_ATTR_RO(interrupts_enabled); |
|
|
|
IPMI_SI_ATTR(short_timeouts); |
|
IPMI_SI_ATTR(long_timeouts); |
|
IPMI_SI_ATTR(idles); |
|
IPMI_SI_ATTR(interrupts); |
|
IPMI_SI_ATTR(attentions); |
|
IPMI_SI_ATTR(flag_fetches); |
|
IPMI_SI_ATTR(hosed_count); |
|
IPMI_SI_ATTR(complete_transactions); |
|
IPMI_SI_ATTR(events); |
|
IPMI_SI_ATTR(watchdog_pretimeouts); |
|
IPMI_SI_ATTR(incoming_messages); |
|
|
|
static ssize_t params_show(struct device *dev, |
|
struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct smi_info *smi_info = dev_get_drvdata(dev); |
|
|
|
return snprintf(buf, 200, |
|
"%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n", |
|
si_to_str[smi_info->io.si_type], |
|
addr_space_to_str[smi_info->io.addr_space], |
|
smi_info->io.addr_data, |
|
smi_info->io.regspacing, |
|
smi_info->io.regsize, |
|
smi_info->io.regshift, |
|
smi_info->io.irq, |
|
smi_info->io.slave_addr); |
|
} |
|
static DEVICE_ATTR_RO(params); |
|
|
|
static struct attribute *ipmi_si_dev_attrs[] = { |
|
&dev_attr_type.attr, |
|
&dev_attr_interrupts_enabled.attr, |
|
&dev_attr_short_timeouts.attr, |
|
&dev_attr_long_timeouts.attr, |
|
&dev_attr_idles.attr, |
|
&dev_attr_interrupts.attr, |
|
&dev_attr_attentions.attr, |
|
&dev_attr_flag_fetches.attr, |
|
&dev_attr_hosed_count.attr, |
|
&dev_attr_complete_transactions.attr, |
|
&dev_attr_events.attr, |
|
&dev_attr_watchdog_pretimeouts.attr, |
|
&dev_attr_incoming_messages.attr, |
|
&dev_attr_params.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group ipmi_si_dev_attr_group = { |
|
.attrs = ipmi_si_dev_attrs, |
|
}; |
|
|
|
/* |
|
* oem_data_avail_to_receive_msg_avail |
|
* @info - smi_info structure with msg_flags set |
|
* |
|
* Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL |
|
* Returns 1 indicating need to re-run handle_flags(). |
|
*/ |
|
static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info) |
|
{ |
|
smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) | |
|
RECEIVE_MSG_AVAIL); |
|
return 1; |
|
} |
|
|
|
/* |
|
* setup_dell_poweredge_oem_data_handler |
|
* @info - smi_info.device_id must be populated |
|
* |
|
* Systems that match, but have firmware version < 1.40 may assert |
|
* OEM0_DATA_AVAIL on their own, without being told via Set Flags that |
|
* it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL |
|
* upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags |
|
* as RECEIVE_MSG_AVAIL instead. |
|
* |
|
* As Dell has no plans to release IPMI 1.5 firmware that *ever* |
|
* assert the OEM[012] bits, and if it did, the driver would have to |
|
* change to handle that properly, we don't actually check for the |
|
* firmware version. |
|
* Device ID = 0x20 BMC on PowerEdge 8G servers |
|
* Device Revision = 0x80 |
|
* Firmware Revision1 = 0x01 BMC version 1.40 |
|
* Firmware Revision2 = 0x40 BCD encoded |
|
* IPMI Version = 0x51 IPMI 1.5 |
|
* Manufacturer ID = A2 02 00 Dell IANA |
|
* |
|
* Additionally, PowerEdge systems with IPMI < 1.5 may also assert |
|
* OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL. |
|
* |
|
*/ |
|
#define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20 |
|
#define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80 |
|
#define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51 |
|
#define DELL_IANA_MFR_ID 0x0002a2 |
|
static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info) |
|
{ |
|
struct ipmi_device_id *id = &smi_info->device_id; |
|
if (id->manufacturer_id == DELL_IANA_MFR_ID) { |
|
if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID && |
|
id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV && |
|
id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) { |
|
smi_info->oem_data_avail_handler = |
|
oem_data_avail_to_receive_msg_avail; |
|
} else if (ipmi_version_major(id) < 1 || |
|
(ipmi_version_major(id) == 1 && |
|
ipmi_version_minor(id) < 5)) { |
|
smi_info->oem_data_avail_handler = |
|
oem_data_avail_to_receive_msg_avail; |
|
} |
|
} |
|
} |
|
|
|
#define CANNOT_RETURN_REQUESTED_LENGTH 0xCA |
|
static void return_hosed_msg_badsize(struct smi_info *smi_info) |
|
{ |
|
struct ipmi_smi_msg *msg = smi_info->curr_msg; |
|
|
|
/* Make it a response */ |
|
msg->rsp[0] = msg->data[0] | 4; |
|
msg->rsp[1] = msg->data[1]; |
|
msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH; |
|
msg->rsp_size = 3; |
|
smi_info->curr_msg = NULL; |
|
deliver_recv_msg(smi_info, msg); |
|
} |
|
|
|
/* |
|
* dell_poweredge_bt_xaction_handler |
|
* @info - smi_info.device_id must be populated |
|
* |
|
* Dell PowerEdge servers with the BT interface (x6xx and 1750) will |
|
* not respond to a Get SDR command if the length of the data |
|
* requested is exactly 0x3A, which leads to command timeouts and no |
|
* data returned. This intercepts such commands, and causes userspace |
|
* callers to try again with a different-sized buffer, which succeeds. |
|
*/ |
|
|
|
#define STORAGE_NETFN 0x0A |
|
#define STORAGE_CMD_GET_SDR 0x23 |
|
static int dell_poweredge_bt_xaction_handler(struct notifier_block *self, |
|
unsigned long unused, |
|
void *in) |
|
{ |
|
struct smi_info *smi_info = in; |
|
unsigned char *data = smi_info->curr_msg->data; |
|
unsigned int size = smi_info->curr_msg->data_size; |
|
if (size >= 8 && |
|
(data[0]>>2) == STORAGE_NETFN && |
|
data[1] == STORAGE_CMD_GET_SDR && |
|
data[7] == 0x3A) { |
|
return_hosed_msg_badsize(smi_info); |
|
return NOTIFY_STOP; |
|
} |
|
return NOTIFY_DONE; |
|
} |
|
|
|
static struct notifier_block dell_poweredge_bt_xaction_notifier = { |
|
.notifier_call = dell_poweredge_bt_xaction_handler, |
|
}; |
|
|
|
/* |
|
* setup_dell_poweredge_bt_xaction_handler |
|
* @info - smi_info.device_id must be filled in already |
|
* |
|
* Fills in smi_info.device_id.start_transaction_pre_hook |
|
* when we know what function to use there. |
|
*/ |
|
static void |
|
setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info) |
|
{ |
|
struct ipmi_device_id *id = &smi_info->device_id; |
|
if (id->manufacturer_id == DELL_IANA_MFR_ID && |
|
smi_info->io.si_type == SI_BT) |
|
register_xaction_notifier(&dell_poweredge_bt_xaction_notifier); |
|
} |
|
|
|
/* |
|
* setup_oem_data_handler |
|
* @info - smi_info.device_id must be filled in already |
|
* |
|
* Fills in smi_info.device_id.oem_data_available_handler |
|
* when we know what function to use there. |
|
*/ |
|
|
|
static void setup_oem_data_handler(struct smi_info *smi_info) |
|
{ |
|
setup_dell_poweredge_oem_data_handler(smi_info); |
|
} |
|
|
|
static void setup_xaction_handlers(struct smi_info *smi_info) |
|
{ |
|
setup_dell_poweredge_bt_xaction_handler(smi_info); |
|
} |
|
|
|
static void check_for_broken_irqs(struct smi_info *smi_info) |
|
{ |
|
check_clr_rcv_irq(smi_info); |
|
check_set_rcv_irq(smi_info); |
|
} |
|
|
|
static inline void stop_timer_and_thread(struct smi_info *smi_info) |
|
{ |
|
if (smi_info->thread != NULL) { |
|
kthread_stop(smi_info->thread); |
|
smi_info->thread = NULL; |
|
} |
|
|
|
smi_info->timer_can_start = false; |
|
del_timer_sync(&smi_info->si_timer); |
|
} |
|
|
|
static struct smi_info *find_dup_si(struct smi_info *info) |
|
{ |
|
struct smi_info *e; |
|
|
|
list_for_each_entry(e, &smi_infos, link) { |
|
if (e->io.addr_space != info->io.addr_space) |
|
continue; |
|
if (e->io.addr_data == info->io.addr_data) { |
|
/* |
|
* This is a cheap hack, ACPI doesn't have a defined |
|
* slave address but SMBIOS does. Pick it up from |
|
* any source that has it available. |
|
*/ |
|
if (info->io.slave_addr && !e->io.slave_addr) |
|
e->io.slave_addr = info->io.slave_addr; |
|
return e; |
|
} |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
int ipmi_si_add_smi(struct si_sm_io *io) |
|
{ |
|
int rv = 0; |
|
struct smi_info *new_smi, *dup; |
|
|
|
/* |
|
* If the user gave us a hard-coded device at the same |
|
* address, they presumably want us to use it and not what is |
|
* in the firmware. |
|
*/ |
|
if (io->addr_source != SI_HARDCODED && io->addr_source != SI_HOTMOD && |
|
ipmi_si_hardcode_match(io->addr_space, io->addr_data)) { |
|
dev_info(io->dev, |
|
"Hard-coded device at this address already exists"); |
|
return -ENODEV; |
|
} |
|
|
|
if (!io->io_setup) { |
|
if (io->addr_space == IPMI_IO_ADDR_SPACE) { |
|
io->io_setup = ipmi_si_port_setup; |
|
} else if (io->addr_space == IPMI_MEM_ADDR_SPACE) { |
|
io->io_setup = ipmi_si_mem_setup; |
|
} else { |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
new_smi = kzalloc(sizeof(*new_smi), GFP_KERNEL); |
|
if (!new_smi) |
|
return -ENOMEM; |
|
spin_lock_init(&new_smi->si_lock); |
|
|
|
new_smi->io = *io; |
|
|
|
mutex_lock(&smi_infos_lock); |
|
dup = find_dup_si(new_smi); |
|
if (dup) { |
|
if (new_smi->io.addr_source == SI_ACPI && |
|
dup->io.addr_source == SI_SMBIOS) { |
|
/* We prefer ACPI over SMBIOS. */ |
|
dev_info(dup->io.dev, |
|
"Removing SMBIOS-specified %s state machine in favor of ACPI\n", |
|
si_to_str[new_smi->io.si_type]); |
|
cleanup_one_si(dup); |
|
} else { |
|
dev_info(new_smi->io.dev, |
|
"%s-specified %s state machine: duplicate\n", |
|
ipmi_addr_src_to_str(new_smi->io.addr_source), |
|
si_to_str[new_smi->io.si_type]); |
|
rv = -EBUSY; |
|
kfree(new_smi); |
|
goto out_err; |
|
} |
|
} |
|
|
|
pr_info("Adding %s-specified %s state machine\n", |
|
ipmi_addr_src_to_str(new_smi->io.addr_source), |
|
si_to_str[new_smi->io.si_type]); |
|
|
|
list_add_tail(&new_smi->link, &smi_infos); |
|
|
|
if (initialized) |
|
rv = try_smi_init(new_smi); |
|
out_err: |
|
mutex_unlock(&smi_infos_lock); |
|
return rv; |
|
} |
|
|
|
/* |
|
* Try to start up an interface. Must be called with smi_infos_lock |
|
* held, primarily to keep smi_num consistent, we only one to do these |
|
* one at a time. |
|
*/ |
|
static int try_smi_init(struct smi_info *new_smi) |
|
{ |
|
int rv = 0; |
|
int i; |
|
|
|
pr_info("Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n", |
|
ipmi_addr_src_to_str(new_smi->io.addr_source), |
|
si_to_str[new_smi->io.si_type], |
|
addr_space_to_str[new_smi->io.addr_space], |
|
new_smi->io.addr_data, |
|
new_smi->io.slave_addr, new_smi->io.irq); |
|
|
|
switch (new_smi->io.si_type) { |
|
case SI_KCS: |
|
new_smi->handlers = &kcs_smi_handlers; |
|
break; |
|
|
|
case SI_SMIC: |
|
new_smi->handlers = &smic_smi_handlers; |
|
break; |
|
|
|
case SI_BT: |
|
new_smi->handlers = &bt_smi_handlers; |
|
break; |
|
|
|
default: |
|
/* No support for anything else yet. */ |
|
rv = -EIO; |
|
goto out_err; |
|
} |
|
|
|
new_smi->si_num = smi_num; |
|
|
|
/* Do this early so it's available for logs. */ |
|
if (!new_smi->io.dev) { |
|
pr_err("IPMI interface added with no device\n"); |
|
rv = -EIO; |
|
goto out_err; |
|
} |
|
|
|
/* Allocate the state machine's data and initialize it. */ |
|
new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL); |
|
if (!new_smi->si_sm) { |
|
rv = -ENOMEM; |
|
goto out_err; |
|
} |
|
new_smi->io.io_size = new_smi->handlers->init_data(new_smi->si_sm, |
|
&new_smi->io); |
|
|
|
/* Now that we know the I/O size, we can set up the I/O. */ |
|
rv = new_smi->io.io_setup(&new_smi->io); |
|
if (rv) { |
|
dev_err(new_smi->io.dev, "Could not set up I/O space\n"); |
|
goto out_err; |
|
} |
|
|
|
/* Do low-level detection first. */ |
|
if (new_smi->handlers->detect(new_smi->si_sm)) { |
|
if (new_smi->io.addr_source) |
|
dev_err(new_smi->io.dev, |
|
"Interface detection failed\n"); |
|
rv = -ENODEV; |
|
goto out_err; |
|
} |
|
|
|
/* |
|
* Attempt a get device id command. If it fails, we probably |
|
* don't have a BMC here. |
|
*/ |
|
rv = try_get_dev_id(new_smi); |
|
if (rv) { |
|
if (new_smi->io.addr_source) |
|
dev_err(new_smi->io.dev, |
|
"There appears to be no BMC at this location\n"); |
|
goto out_err; |
|
} |
|
|
|
setup_oem_data_handler(new_smi); |
|
setup_xaction_handlers(new_smi); |
|
check_for_broken_irqs(new_smi); |
|
|
|
new_smi->waiting_msg = NULL; |
|
new_smi->curr_msg = NULL; |
|
atomic_set(&new_smi->req_events, 0); |
|
new_smi->run_to_completion = false; |
|
for (i = 0; i < SI_NUM_STATS; i++) |
|
atomic_set(&new_smi->stats[i], 0); |
|
|
|
new_smi->interrupt_disabled = true; |
|
atomic_set(&new_smi->need_watch, 0); |
|
|
|
rv = try_enable_event_buffer(new_smi); |
|
if (rv == 0) |
|
new_smi->has_event_buffer = true; |
|
|
|
/* |
|
* Start clearing the flags before we enable interrupts or the |
|
* timer to avoid racing with the timer. |
|
*/ |
|
start_clear_flags(new_smi); |
|
|
|
/* |
|
* IRQ is defined to be set when non-zero. req_events will |
|
* cause a global flags check that will enable interrupts. |
|
*/ |
|
if (new_smi->io.irq) { |
|
new_smi->interrupt_disabled = false; |
|
atomic_set(&new_smi->req_events, 1); |
|
} |
|
|
|
dev_set_drvdata(new_smi->io.dev, new_smi); |
|
rv = device_add_group(new_smi->io.dev, &ipmi_si_dev_attr_group); |
|
if (rv) { |
|
dev_err(new_smi->io.dev, |
|
"Unable to add device attributes: error %d\n", |
|
rv); |
|
goto out_err; |
|
} |
|
new_smi->dev_group_added = true; |
|
|
|
rv = ipmi_register_smi(&handlers, |
|
new_smi, |
|
new_smi->io.dev, |
|
new_smi->io.slave_addr); |
|
if (rv) { |
|
dev_err(new_smi->io.dev, |
|
"Unable to register device: error %d\n", |
|
rv); |
|
goto out_err; |
|
} |
|
|
|
/* Don't increment till we know we have succeeded. */ |
|
smi_num++; |
|
|
|
dev_info(new_smi->io.dev, "IPMI %s interface initialized\n", |
|
si_to_str[new_smi->io.si_type]); |
|
|
|
WARN_ON(new_smi->io.dev->init_name != NULL); |
|
|
|
out_err: |
|
if (rv && new_smi->io.io_cleanup) { |
|
new_smi->io.io_cleanup(&new_smi->io); |
|
new_smi->io.io_cleanup = NULL; |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
static int __init init_ipmi_si(void) |
|
{ |
|
struct smi_info *e; |
|
enum ipmi_addr_src type = SI_INVALID; |
|
|
|
if (initialized) |
|
return 0; |
|
|
|
ipmi_hardcode_init(); |
|
|
|
pr_info("IPMI System Interface driver\n"); |
|
|
|
ipmi_si_platform_init(); |
|
|
|
ipmi_si_pci_init(); |
|
|
|
ipmi_si_parisc_init(); |
|
|
|
/* We prefer devices with interrupts, but in the case of a machine |
|
with multiple BMCs we assume that there will be several instances |
|
of a given type so if we succeed in registering a type then also |
|
try to register everything else of the same type */ |
|
mutex_lock(&smi_infos_lock); |
|
list_for_each_entry(e, &smi_infos, link) { |
|
/* Try to register a device if it has an IRQ and we either |
|
haven't successfully registered a device yet or this |
|
device has the same type as one we successfully registered */ |
|
if (e->io.irq && (!type || e->io.addr_source == type)) { |
|
if (!try_smi_init(e)) { |
|
type = e->io.addr_source; |
|
} |
|
} |
|
} |
|
|
|
/* type will only have been set if we successfully registered an si */ |
|
if (type) |
|
goto skip_fallback_noirq; |
|
|
|
/* Fall back to the preferred device */ |
|
|
|
list_for_each_entry(e, &smi_infos, link) { |
|
if (!e->io.irq && (!type || e->io.addr_source == type)) { |
|
if (!try_smi_init(e)) { |
|
type = e->io.addr_source; |
|
} |
|
} |
|
} |
|
|
|
skip_fallback_noirq: |
|
initialized = true; |
|
mutex_unlock(&smi_infos_lock); |
|
|
|
if (type) |
|
return 0; |
|
|
|
mutex_lock(&smi_infos_lock); |
|
if (unload_when_empty && list_empty(&smi_infos)) { |
|
mutex_unlock(&smi_infos_lock); |
|
cleanup_ipmi_si(); |
|
pr_warn("Unable to find any System Interface(s)\n"); |
|
return -ENODEV; |
|
} else { |
|
mutex_unlock(&smi_infos_lock); |
|
return 0; |
|
} |
|
} |
|
module_init(init_ipmi_si); |
|
|
|
static void shutdown_smi(void *send_info) |
|
{ |
|
struct smi_info *smi_info = send_info; |
|
|
|
if (smi_info->dev_group_added) { |
|
device_remove_group(smi_info->io.dev, &ipmi_si_dev_attr_group); |
|
smi_info->dev_group_added = false; |
|
} |
|
if (smi_info->io.dev) |
|
dev_set_drvdata(smi_info->io.dev, NULL); |
|
|
|
/* |
|
* Make sure that interrupts, the timer and the thread are |
|
* stopped and will not run again. |
|
*/ |
|
smi_info->interrupt_disabled = true; |
|
if (smi_info->io.irq_cleanup) { |
|
smi_info->io.irq_cleanup(&smi_info->io); |
|
smi_info->io.irq_cleanup = NULL; |
|
} |
|
stop_timer_and_thread(smi_info); |
|
|
|
/* |
|
* Wait until we know that we are out of any interrupt |
|
* handlers might have been running before we freed the |
|
* interrupt. |
|
*/ |
|
synchronize_rcu(); |
|
|
|
/* |
|
* Timeouts are stopped, now make sure the interrupts are off |
|
* in the BMC. Note that timers and CPU interrupts are off, |
|
* so no need for locks. |
|
*/ |
|
while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) { |
|
poll(smi_info); |
|
schedule_timeout_uninterruptible(1); |
|
} |
|
if (smi_info->handlers) |
|
disable_si_irq(smi_info); |
|
while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) { |
|
poll(smi_info); |
|
schedule_timeout_uninterruptible(1); |
|
} |
|
if (smi_info->handlers) |
|
smi_info->handlers->cleanup(smi_info->si_sm); |
|
|
|
if (smi_info->io.io_cleanup) { |
|
smi_info->io.io_cleanup(&smi_info->io); |
|
smi_info->io.io_cleanup = NULL; |
|
} |
|
|
|
kfree(smi_info->si_sm); |
|
smi_info->si_sm = NULL; |
|
|
|
smi_info->intf = NULL; |
|
} |
|
|
|
/* |
|
* Must be called with smi_infos_lock held, to serialize the |
|
* smi_info->intf check. |
|
*/ |
|
static void cleanup_one_si(struct smi_info *smi_info) |
|
{ |
|
if (!smi_info) |
|
return; |
|
|
|
list_del(&smi_info->link); |
|
|
|
if (smi_info->intf) |
|
ipmi_unregister_smi(smi_info->intf); |
|
|
|
kfree(smi_info); |
|
} |
|
|
|
void ipmi_si_remove_by_dev(struct device *dev) |
|
{ |
|
struct smi_info *e; |
|
|
|
mutex_lock(&smi_infos_lock); |
|
list_for_each_entry(e, &smi_infos, link) { |
|
if (e->io.dev == dev) { |
|
cleanup_one_si(e); |
|
break; |
|
} |
|
} |
|
mutex_unlock(&smi_infos_lock); |
|
} |
|
|
|
struct device *ipmi_si_remove_by_data(int addr_space, enum si_type si_type, |
|
unsigned long addr) |
|
{ |
|
/* remove */ |
|
struct smi_info *e, *tmp_e; |
|
struct device *dev = NULL; |
|
|
|
mutex_lock(&smi_infos_lock); |
|
list_for_each_entry_safe(e, tmp_e, &smi_infos, link) { |
|
if (e->io.addr_space != addr_space) |
|
continue; |
|
if (e->io.si_type != si_type) |
|
continue; |
|
if (e->io.addr_data == addr) { |
|
dev = get_device(e->io.dev); |
|
cleanup_one_si(e); |
|
} |
|
} |
|
mutex_unlock(&smi_infos_lock); |
|
|
|
return dev; |
|
} |
|
|
|
static void cleanup_ipmi_si(void) |
|
{ |
|
struct smi_info *e, *tmp_e; |
|
|
|
if (!initialized) |
|
return; |
|
|
|
ipmi_si_pci_shutdown(); |
|
|
|
ipmi_si_parisc_shutdown(); |
|
|
|
ipmi_si_platform_shutdown(); |
|
|
|
mutex_lock(&smi_infos_lock); |
|
list_for_each_entry_safe(e, tmp_e, &smi_infos, link) |
|
cleanup_one_si(e); |
|
mutex_unlock(&smi_infos_lock); |
|
|
|
ipmi_si_hardcode_exit(); |
|
ipmi_si_hotmod_exit(); |
|
} |
|
module_exit(cleanup_ipmi_si); |
|
|
|
MODULE_ALIAS("platform:dmi-ipmi-si"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Corey Minyard <[email protected]>"); |
|
MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT system interfaces.");
|
|
|