2294 lines
58 KiB
C
2294 lines
58 KiB
C
// 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 <minyard@mvista.com>
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* source@mvista.com
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*
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* Copyright 2002 MontaVista Software Inc.
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* Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com>
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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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#define pr_fmt(fmt) "ipmi_si: " fmt
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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 <linux/string.h>
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#include <linux/ctype.h>
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/* Measure times between events in the driver. */
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#undef DEBUG_TIMING
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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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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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/* 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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static const char * const si_to_str[] = { "invalid", "kcs", "smic", "bt" };
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static int 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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/* Number of times the interface was idle while being polled. */
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SI_STAT_idles,
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/* Number of interrupts the driver handled. */
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SI_STAT_interrupts,
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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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/* Number of times the driver requested flags from the hardware. */
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SI_STAT_flag_fetches,
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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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/* Number of completed messages. */
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SI_STAT_complete_transactions,
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/* Number of IPMI events received from the hardware. */
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SI_STAT_events,
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/* Number of watchdog pretimeouts. */
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SI_STAT_watchdog_pretimeouts,
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/* Number of asynchronous messages received. */
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SI_STAT_incoming_messages,
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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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* 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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* 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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* 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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/* Does the BMC have an event buffer? */
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bool has_event_buffer;
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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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* 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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/* The timer for this si. */
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struct timer_list si_timer;
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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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/* 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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/* The time (in jiffies) the last timeout occurred at. */
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unsigned long last_timeout_jiffies;
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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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* 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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* 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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* 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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* 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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* 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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/* From the get device id response... */
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struct ipmi_device_id device_id;
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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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/* Counters and things for the proc filesystem. */
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atomic_t stats[SI_NUM_STATS];
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struct task_struct *thread;
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struct list_head link;
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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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#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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static unsigned int kipmid_max_busy_us[IPMI_MAX_INTFS];
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static int num_max_busy_us;
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static bool unload_when_empty = true;
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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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#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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ktime_get_ts64(&t);
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pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) 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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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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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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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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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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/* 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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smi_info->curr_msg = NULL;
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deliver_recv_msg(smi_info, msg);
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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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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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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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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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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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* 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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smi_info->handlers->start_transaction(smi_info->si_sm, msg, size);
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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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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
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* allocate messages, we just leave them in the BMC and run the system
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* polled until we can allocate some memory. Once we have some
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* 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
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* be shared.
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*/
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static inline bool disable_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 = true;
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start_check_enables(smi_info);
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return true;
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}
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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);
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return true;
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}
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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
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* disable process and return NULL. If able to allocate but
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* interrupts are disabled, free the message and return NULL after
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* starting the interrupt enable process.
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*/
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static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info)
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{
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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))
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smi_info->si_state = SI_NORMAL;
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} else if (enable_si_irq(smi_info)) {
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ipmi_free_smi_msg(msg);
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msg = NULL;
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}
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return msg;
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}
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static void handle_flags(struct smi_info *smi_info)
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{
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retry:
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if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
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/* Watchdog pre-timeout */
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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);
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} else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
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/* Messages available. */
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smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
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if (!smi_info->curr_msg)
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return;
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start_getting_msg_queue(smi_info);
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} else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
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/* Events available. */
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smi_info->curr_msg = alloc_msg_handle_irq(smi_info);
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if (!smi_info->curr_msg)
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return;
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start_getting_events(smi_info);
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} else if (smi_info->msg_flags & OEM_DATA_AVAIL &&
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smi_info->oem_data_avail_handler) {
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if (smi_info->oem_data_avail_handler(smi_info))
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goto retry;
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} else
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smi_info->si_state = SI_NORMAL;
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}
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/*
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* Global enables we care about.
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*/
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#define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
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IPMI_BMC_EVT_MSG_INTR)
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static u8 current_global_enables(struct smi_info *smi_info, u8 base,
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bool *irq_on)
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{
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u8 enables = 0;
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if (smi_info->supports_event_msg_buff)
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enables |= IPMI_BMC_EVT_MSG_BUFF;
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if (((smi_info->io.irq && !smi_info->interrupt_disabled) ||
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smi_info->cannot_disable_irq) &&
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!smi_info->irq_enable_broken)
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enables |= IPMI_BMC_RCV_MSG_INTR;
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if (smi_info->supports_event_msg_buff &&
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smi_info->io.irq && !smi_info->interrupt_disabled &&
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!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
|
|
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(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(smi_info->io.dev,
|
|
"Couldn't get irq info: %x.\n", msg[2]);
|
|
dev_warn(smi_info->io.dev,
|
|
"Maybe ok, but ipmi might run very slowly.\n");
|
|
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(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 in the nsec value of the busy waiting timespec to tell that
|
|
* we are spinning in kipmid looking for something and not delaying
|
|
* between checks
|
|
*/
|
|
static inline void ipmi_si_set_not_busy(struct timespec64 *ts)
|
|
{
|
|
ts->tv_nsec = -1;
|
|
}
|
|
static inline int ipmi_si_is_busy(struct timespec64 *ts)
|
|
{
|
|
return ts->tv_nsec != -1;
|
|
}
|
|
|
|
static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result,
|
|
const struct smi_info *smi_info,
|
|
struct timespec64 *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)
|
|
ipmi_si_set_not_busy(busy_until);
|
|
else if (!ipmi_si_is_busy(busy_until)) {
|
|
ktime_get_ts64(busy_until);
|
|
timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
|
|
} else {
|
|
struct timespec64 now;
|
|
|
|
ktime_get_ts64(&now);
|
|
if (unlikely(timespec64_compare(&now, busy_until) > 0)) {
|
|
ipmi_si_set_not_busy(busy_until);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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/IPMI.txt for details.
|
|
*/
|
|
static int ipmi_thread(void *data)
|
|
{
|
|
struct smi_info *smi_info = data;
|
|
unsigned long flags;
|
|
enum si_sm_result smi_result;
|
|
struct timespec64 busy_until;
|
|
|
|
ipmi_si_set_not_busy(&busy_until);
|
|
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)
|
|
schedule();
|
|
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);
|
|
}
|
|
|
|
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,
|
|
DEVICE_NAME,
|
|
io->irq_handler_data);
|
|
if (rv) {
|
|
dev_warn(io->dev, "%s unable to claim interrupt %d,"
|
|
" running polled\n",
|
|
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;
|
|
|
|
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;
|
|
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);
|
|
|
|
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 ipmi_##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(name, S_IRUGO, ipmi_##name##_show, NULL)
|
|
|
|
static ssize_t ipmi_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(type, S_IRUGO, ipmi_type_show, NULL);
|
|
|
|
static ssize_t ipmi_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(interrupts_enabled, S_IRUGO,
|
|
ipmi_interrupts_enabled_show, NULL);
|
|
|
|
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 ipmi_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(params, S_IRUGO, ipmi_params_show, NULL);
|
|
|
|
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;
|
|
if (smi_info->timer_running)
|
|
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 = 1;
|
|
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.addr_source_cleanup) {
|
|
smi_info->io.addr_source_cleanup(&smi_info->io);
|
|
smi_info->io.addr_source_cleanup = NULL;
|
|
}
|
|
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);
|
|
}
|
|
|
|
int ipmi_si_remove_by_dev(struct device *dev)
|
|
{
|
|
struct smi_info *e;
|
|
int rv = -ENOENT;
|
|
|
|
mutex_lock(&smi_infos_lock);
|
|
list_for_each_entry(e, &smi_infos, link) {
|
|
if (e->io.dev == dev) {
|
|
cleanup_one_si(e);
|
|
rv = 0;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&smi_infos_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
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 <minyard@mvista.com>");
|
|
MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT"
|
|
" system interfaces.");
|