--- /dev/null
+/*
+ * ipmi_si.c
+ *
+ * The interface to the IPMI driver for the system interfaces (KCS, SMIC,
+ * BT).
+ *
+ * Author: MontaVista Software, Inc.
+ * Corey Minyard <minyard@mvista.com>
+ * source@mvista.com
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ * Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * This file holds the "policy" for the interface to the SMI state
+ * machine. It does the configuration, handles timers and interrupts,
+ * and drives the real SMI state machine.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+#include <asm/irq.h>
+#include <linux/interrupt.h>
+#include <linux/rcupdate.h>
+#include <linux/ipmi.h>
+#include <linux/ipmi_smi.h>
+#include <asm/io.h>
+#include "ipmi_si_sm.h"
+#include <linux/dmi.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/pnp.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#ifdef CONFIG_PARISC
+#include <asm/hardware.h> /* for register_parisc_driver() stuff */
+#include <asm/parisc-device.h>
+#endif
+
+#define PFX "ipmi_si: "
+
+/* Measure times between events in the driver. */
+#undef DEBUG_TIMING
+
+/* Call every 10 ms. */
+#define SI_TIMEOUT_TIME_USEC 10000
+#define SI_USEC_PER_JIFFY (1000000/HZ)
+#define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY)
+#define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a
+ short timeout */
+
+enum si_intf_state {
+ SI_NORMAL,
+ SI_GETTING_FLAGS,
+ SI_GETTING_EVENTS,
+ SI_CLEARING_FLAGS,
+ SI_GETTING_MESSAGES,
+ SI_CHECKING_ENABLES,
+ SI_SETTING_ENABLES
+ /* FIXME - add watchdog stuff. */
+};
+
+/* Some BT-specific defines we need here. */
+#define IPMI_BT_INTMASK_REG 2
+#define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2
+#define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1
+
+enum si_type {
+ SI_KCS, SI_SMIC, SI_BT
+};
+static char *si_to_str[] = { "kcs", "smic", "bt" };
+
+#define DEVICE_NAME "ipmi_si"
+
+static struct platform_driver ipmi_driver;
+
+/*
+ * Indexes into stats[] in smi_info below.
+ */
+enum si_stat_indexes {
+ /*
+ * Number of times the driver requested a timer while an operation
+ * was in progress.
+ */
+ SI_STAT_short_timeouts = 0,
+
+ /*
+ * Number of times the driver requested a timer while nothing was in
+ * progress.
+ */
+ SI_STAT_long_timeouts,
+
+ /* Number of times the interface was idle while being polled. */
+ SI_STAT_idles,
+
+ /* Number of interrupts the driver handled. */
+ SI_STAT_interrupts,
+
+ /* Number of time the driver got an ATTN from the hardware. */
+ SI_STAT_attentions,
+
+ /* Number of times the driver requested flags from the hardware. */
+ SI_STAT_flag_fetches,
+
+ /* Number of times the hardware didn't follow the state machine. */
+ SI_STAT_hosed_count,
+
+ /* Number of completed messages. */
+ SI_STAT_complete_transactions,
+
+ /* Number of IPMI events received from the hardware. */
+ SI_STAT_events,
+
+ /* Number of watchdog pretimeouts. */
+ SI_STAT_watchdog_pretimeouts,
+
+ /* Number of asynchronous messages received. */
+ SI_STAT_incoming_messages,
+
+
+ /* This *must* remain last, add new values above this. */
+ SI_NUM_STATS
+};
+
+struct smi_info {
+ int intf_num;
+ ipmi_smi_t intf;
+ struct si_sm_data *si_sm;
+ struct si_sm_handlers *handlers;
+ enum si_type si_type;
+ spinlock_t si_lock;
+ struct ipmi_smi_msg *waiting_msg;
+ struct ipmi_smi_msg *curr_msg;
+ enum si_intf_state si_state;
+
+ /*
+ * Used to handle the various types of I/O that can occur with
+ * IPMI
+ */
+ struct si_sm_io io;
+ int (*io_setup)(struct smi_info *info);
+ void (*io_cleanup)(struct smi_info *info);
+ int (*irq_setup)(struct smi_info *info);
+ void (*irq_cleanup)(struct smi_info *info);
+ unsigned int io_size;
+ enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
+ void (*addr_source_cleanup)(struct smi_info *info);
+ void *addr_source_data;
+
+ /*
+ * Per-OEM handler, called from handle_flags(). Returns 1
+ * when handle_flags() needs to be re-run or 0 indicating it
+ * set si_state itself.
+ */
+ int (*oem_data_avail_handler)(struct smi_info *smi_info);
+
+ /*
+ * Flags from the last GET_MSG_FLAGS command, used when an ATTN
+ * is set to hold the flags until we are done handling everything
+ * from the flags.
+ */
+#define RECEIVE_MSG_AVAIL 0x01
+#define EVENT_MSG_BUFFER_FULL 0x02
+#define WDT_PRE_TIMEOUT_INT 0x08
+#define OEM0_DATA_AVAIL 0x20
+#define OEM1_DATA_AVAIL 0x40
+#define OEM2_DATA_AVAIL 0x80
+#define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \
+ OEM1_DATA_AVAIL | \
+ OEM2_DATA_AVAIL)
+ unsigned char msg_flags;
+
+ /* Does the BMC have an event buffer? */
+ bool has_event_buffer;
+
+ /*
+ * If set to true, this will request events the next time the
+ * state machine is idle.
+ */
+ atomic_t req_events;
+
+ /*
+ * If true, run the state machine to completion on every send
+ * call. Generally used after a panic to make sure stuff goes
+ * out.
+ */
+ bool run_to_completion;
+
+ /* The I/O port of an SI interface. */
+ int port;
+
+ /*
+ * The space between start addresses of the two ports. For
+ * instance, if the first port is 0xca2 and the spacing is 4, then
+ * the second port is 0xca6.
+ */
+ unsigned int spacing;
+
+ /* zero if no irq; */
+ int irq;
+
+ /* The timer for this si. */
+ struct timer_list si_timer;
+
+ /* This flag is set, if the timer is running (timer_pending() isn't enough) */
+ bool timer_running;
+
+ /* The time (in jiffies) the last timeout occurred at. */
+ unsigned long last_timeout_jiffies;
+
+ /* Are we waiting for the events, pretimeouts, received msgs? */
+ atomic_t need_watch;
+
+ /*
+ * The driver will disable interrupts when it gets into a
+ * situation where it cannot handle messages due to lack of
+ * memory. Once that situation clears up, it will re-enable
+ * interrupts.
+ */
+ bool interrupt_disabled;
+
+ /*
+ * Does the BMC support events?
+ */
+ bool supports_event_msg_buff;
+
+ /*
+ * Can we clear the global enables receive irq bit?
+ */
+ bool cannot_clear_recv_irq_bit;
+
+ /*
+ * Did we get an attention that we did not handle?
+ */
+ bool got_attn;
+
+ /* From the get device id response... */
+ struct ipmi_device_id device_id;
+
+ /* Driver model stuff. */
+ struct device *dev;
+ struct platform_device *pdev;
+
+ /*
+ * True if we allocated the device, false if it came from
+ * someplace else (like PCI).
+ */
+ bool dev_registered;
+
+ /* Slave address, could be reported from DMI. */
+ unsigned char slave_addr;
+
+ /* Counters and things for the proc filesystem. */
+ atomic_t stats[SI_NUM_STATS];
+
+ struct task_struct *thread;
+
+ struct list_head link;
+ union ipmi_smi_info_union addr_info;
+};
+
+#define smi_inc_stat(smi, stat) \
+ atomic_inc(&(smi)->stats[SI_STAT_ ## stat])
+#define smi_get_stat(smi, stat) \
+ ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat]))
+
+#define SI_MAX_PARMS 4
+
+static int force_kipmid[SI_MAX_PARMS];
+static int num_force_kipmid;
+#ifdef CONFIG_PCI
+static bool pci_registered;
+#endif
+#ifdef CONFIG_ACPI
+static bool pnp_registered;
+#endif
+#ifdef CONFIG_PARISC
+static bool parisc_registered;
+#endif
+
+static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
+static int num_max_busy_us;
+
+static bool unload_when_empty = true;
+
+static int add_smi(struct smi_info *smi);
+static int try_smi_init(struct smi_info *smi);
+static void cleanup_one_si(struct smi_info *to_clean);
+static void cleanup_ipmi_si(void);
+
+#ifdef DEBUG_TIMING
+void debug_timestamp(char *msg)
+{
+ struct timespec64 t;
+
+ getnstimeofday64(&t);
+ pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec);
+}
+#else
+#define debug_timestamp(x)
+#endif
+
+static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list);
+static int register_xaction_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&xaction_notifier_list, nb);
+}
+
+static void deliver_recv_msg(struct smi_info *smi_info,
+ struct ipmi_smi_msg *msg)
+{
+ /* Deliver the message to the upper layer. */
+ if (smi_info->intf)
+ ipmi_smi_msg_received(smi_info->intf, msg);
+ else
+ ipmi_free_smi_msg(msg);
+}
+
+static void return_hosed_msg(struct smi_info *smi_info, int cCode)
+{
+ struct ipmi_smi_msg *msg = smi_info->curr_msg;
+
+ if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED)
+ cCode = IPMI_ERR_UNSPECIFIED;
+ /* else use it as is */
+
+ /* Make it a response */
+ msg->rsp[0] = msg->data[0] | 4;
+ msg->rsp[1] = msg->data[1];
+ msg->rsp[2] = cCode;
+ msg->rsp_size = 3;
+
+ smi_info->curr_msg = NULL;
+ deliver_recv_msg(smi_info, msg);
+}
+
+static enum si_sm_result start_next_msg(struct smi_info *smi_info)
+{
+ int rv;
+
+ if (!smi_info->waiting_msg) {
+ smi_info->curr_msg = NULL;
+ rv = SI_SM_IDLE;
+ } else {
+ int err;
+
+ smi_info->curr_msg = smi_info->waiting_msg;
+ smi_info->waiting_msg = NULL;
+ debug_timestamp("Start2");
+ err = atomic_notifier_call_chain(&xaction_notifier_list,
+ 0, smi_info);
+ if (err & NOTIFY_STOP_MASK) {
+ rv = SI_SM_CALL_WITHOUT_DELAY;
+ goto out;
+ }
+ err = smi_info->handlers->start_transaction(
+ smi_info->si_sm,
+ smi_info->curr_msg->data,
+ smi_info->curr_msg->data_size);
+ if (err)
+ return_hosed_msg(smi_info, err);
+
+ rv = SI_SM_CALL_WITHOUT_DELAY;
+ }
+ out:
+ return rv;
+}
+
+static void start_check_enables(struct smi_info *smi_info)
+{
+ unsigned char msg[2];
+
+ 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);
+ smi_info->si_state = SI_CHECKING_ENABLES;
+}
+
+static void start_clear_flags(struct smi_info *smi_info)
+{
+ unsigned char msg[3];
+
+ /* Make sure the watchdog pre-timeout flag is not set at startup. */
+ msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
+ msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
+ msg[2] = WDT_PRE_TIMEOUT_INT;
+
+ smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
+ smi_info->si_state = SI_CLEARING_FLAGS;
+}
+
+static void start_getting_msg_queue(struct smi_info *smi_info)
+{
+ smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
+ smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
+ smi_info->curr_msg->data_size = 2;
+
+ smi_info->handlers->start_transaction(
+ smi_info->si_sm,
+ smi_info->curr_msg->data,
+ smi_info->curr_msg->data_size);
+ smi_info->si_state = SI_GETTING_MESSAGES;
+}
+
+static void start_getting_events(struct smi_info *smi_info)
+{
+ smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
+ smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
+ smi_info->curr_msg->data_size = 2;
+
+ smi_info->handlers->start_transaction(
+ smi_info->si_sm,
+ smi_info->curr_msg->data,
+ smi_info->curr_msg->data_size);
+ smi_info->si_state = SI_GETTING_EVENTS;
+}
+
+static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val)
+{
+ smi_info->last_timeout_jiffies = jiffies;
+ mod_timer(&smi_info->si_timer, new_val);
+ smi_info->timer_running = true;
+}
+
+/*
+ * 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.
+ *
+ * Note that we cannot just use disable_irq(), since the interrupt may
+ * be shared.
+ */
+static inline bool disable_si_irq(struct smi_info *smi_info)
+{
+ if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
+ smi_info->interrupt_disabled = true;
+ start_check_enables(smi_info);
+ return true;
+ }
+ return false;
+}
+
+static inline bool enable_si_irq(struct smi_info *smi_info)
+{
+ if ((smi_info->irq) && (smi_info->interrupt_disabled)) {
+ smi_info->interrupt_disabled = false;
+ start_check_enables(smi_info);
+ return true;
+ }
+ return false;
+}
+
+/*
+ * Allocate a message. If unable to allocate, start the interrupt
+ * disable process and return NULL. If able to allocate but
+ * interrupts are disabled, free the message and return NULL after
+ * starting the interrupt enable process.
+ */
+static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info)
+{
+ struct ipmi_smi_msg *msg;
+
+ msg = ipmi_alloc_smi_msg();
+ if (!msg) {
+ if (!disable_si_irq(smi_info))
+ smi_info->si_state = SI_NORMAL;
+ } else if (enable_si_irq(smi_info)) {
+ ipmi_free_smi_msg(msg);
+ msg = NULL;
+ }
+ return msg;
+}
+
+static void handle_flags(struct smi_info *smi_info)
+{
+ retry:
+ if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
+ /* Watchdog pre-timeout */
+ smi_inc_stat(smi_info, watchdog_pretimeouts);
+
+ start_clear_flags(smi_info);
+ smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
+ if (smi_info->intf)
+ 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->irq && !smi_info->interrupt_disabled) ||
+ smi_info->cannot_clear_recv_irq_bit)
+ enables |= IPMI_BMC_RCV_MSG_INTR;
+
+ if (smi_info->supports_event_msg_buff &&
+ smi_info->irq && !smi_info->interrupt_disabled)
+
+ 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->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->dev,
+ "Couldn't get irq info: %x.\n", msg[2]);
+ dev_warn(smi_info->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->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_msg_queue(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->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_msg_queue(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);
+ si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
+ } 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);
+ }
+ si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
+ }
+
+ /*
+ * We prefer handling attn over new messages. But don't do
+ * this if there is not yet an upper layer to handle anything.
+ */
+ if (likely(smi_info->intf) &&
+ (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;
+
+ smi_info->handlers->start_transaction(
+ smi_info->si_sm, 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->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;
+ }
+ 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 sender(void *send_info,
+ struct ipmi_smi_msg *msg)
+{
+ struct smi_info *smi_info = send_info;
+ enum si_sm_result result;
+ unsigned long flags;
+
+ debug_timestamp("Enqueue");
+
+ if (smi_info->run_to_completion) {
+ /*
+ * If we are running to completion, start it and run
+ * transactions until everything is clear.
+ */
+ smi_info->waiting_msg = msg;
+
+ /*
+ * Run to completion 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);
+ }
+ 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;
+ enum si_sm_result result;
+
+ smi_info->run_to_completion = i_run_to_completion;
+ if (i_run_to_completion) {
+ 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);
+ }
+ }
+}
+
+/*
+ * 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->intf_num < num_max_busy_us)
+ max_busy_us = kipmid_max_busy_us[smi_info->intf_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)) {
+ getnstimeofday64(busy_until);
+ timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC);
+ } else {
+ struct timespec64 now;
+
+ getnstimeofday64(&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, bool enable)
+{
+ struct smi_info *smi_info = send_info;
+ unsigned long flags;
+
+ 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 int initialized;
+
+static void smi_timeout(unsigned long data)
+{
+ struct smi_info *smi_info = (struct smi_info *) data;
+ 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->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);
+}
+
+static irqreturn_t si_irq_handler(int irq, void *data)
+{
+ struct smi_info *smi_info = data;
+ unsigned long flags;
+
+ 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 irqreturn_t si_bt_irq_handler(int irq, void *data)
+{
+ struct smi_info *smi_info = data;
+ /* 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);
+ return si_irq_handler(irq, data);
+}
+
+static int smi_start_processing(void *send_info,
+ ipmi_smi_t intf)
+{
+ struct smi_info *new_smi = send_info;
+ int enable = 0;
+
+ new_smi->intf = intf;
+
+ /* Try to claim any interrupts. */
+ if (new_smi->irq_setup)
+ new_smi->irq_setup(new_smi);
+
+ /* Set up the timer that drives the interface. */
+ setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
+ smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES);
+
+ /*
+ * Check if the user forcefully enabled the daemon.
+ */
+ if (new_smi->intf_num < num_force_kipmid)
+ enable = force_kipmid[new_smi->intf_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->si_type != SI_BT) && (!new_smi->irq))
+ enable = 1;
+
+ if (enable) {
+ new_smi->thread = kthread_run(ipmi_thread, new_smi,
+ "kipmi%d", new_smi->intf_num);
+ if (IS_ERR(new_smi->thread)) {
+ dev_notice(new_smi->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->addr_source;
+ data->dev = smi->dev;
+ data->addr_info = smi->addr_info;
+ get_device(smi->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 struct ipmi_smi_handlers handlers = {
+ .owner = THIS_MODULE,
+ .start_processing = smi_start_processing,
+ .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,
+ .poll = poll,
+};
+
+/*
+ * There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
+ * a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS.
+ */
+
+static LIST_HEAD(smi_infos);
+static DEFINE_MUTEX(smi_infos_lock);
+static int smi_num; /* Used to sequence the SMIs */
+
+#define DEFAULT_REGSPACING 1
+#define DEFAULT_REGSIZE 1
+
+#ifdef CONFIG_ACPI
+static bool si_tryacpi = 1;
+#endif
+#ifdef CONFIG_DMI
+static bool si_trydmi = 1;
+#endif
+static bool si_tryplatform = 1;
+#ifdef CONFIG_PCI
+static bool si_trypci = 1;
+#endif
+static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
+static char *si_type[SI_MAX_PARMS];
+#define MAX_SI_TYPE_STR 30
+static char si_type_str[MAX_SI_TYPE_STR];
+static unsigned long addrs[SI_MAX_PARMS];
+static unsigned int num_addrs;
+static unsigned int ports[SI_MAX_PARMS];
+static unsigned int num_ports;
+static int irqs[SI_MAX_PARMS];
+static unsigned int num_irqs;
+static int regspacings[SI_MAX_PARMS];
+static unsigned int num_regspacings;
+static int regsizes[SI_MAX_PARMS];
+static unsigned int num_regsizes;
+static int regshifts[SI_MAX_PARMS];
+static unsigned int num_regshifts;
+static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */
+static unsigned int num_slave_addrs;
+
+#define IPMI_IO_ADDR_SPACE 0
+#define IPMI_MEM_ADDR_SPACE 1
+static char *addr_space_to_str[] = { "i/o", "mem" };
+
+static int hotmod_handler(const char *val, struct kernel_param *kp);
+
+module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200);
+MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See"
+ " Documentation/IPMI.txt in the kernel sources for the"
+ " gory details.");
+
+#ifdef CONFIG_ACPI
+module_param_named(tryacpi, si_tryacpi, bool, 0);
+MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
+ " default scan of the interfaces identified via ACPI");
+#endif
+#ifdef CONFIG_DMI
+module_param_named(trydmi, si_trydmi, bool, 0);
+MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
+ " default scan of the interfaces identified via DMI");
+#endif
+module_param_named(tryplatform, si_tryplatform, bool, 0);
+MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
+ " default scan of the interfaces identified via platform"
+ " interfaces like openfirmware");
+#ifdef CONFIG_PCI
+module_param_named(trypci, si_trypci, bool, 0);
+MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
+ " default scan of the interfaces identified via pci");
+#endif
+module_param_named(trydefaults, si_trydefaults, bool, 0);
+MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
+ " default scan of the KCS and SMIC interface at the standard"
+ " address");
+module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
+MODULE_PARM_DESC(type, "Defines the type of each interface, each"
+ " interface separated by commas. The types are 'kcs',"
+ " 'smic', and 'bt'. For example si_type=kcs,bt will set"
+ " the first interface to kcs and the second to bt");
+module_param_array(addrs, ulong, &num_addrs, 0);
+MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
+ " addresses separated by commas. Only use if an interface"
+ " is in memory. Otherwise, set it to zero or leave"
+ " it blank.");
+module_param_array(ports, uint, &num_ports, 0);
+MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
+ " addresses separated by commas. Only use if an interface"
+ " is a port. Otherwise, set it to zero or leave"
+ " it blank.");
+module_param_array(irqs, int, &num_irqs, 0);
+MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
+ " addresses separated by commas. Only use if an interface"
+ " has an interrupt. Otherwise, set it to zero or leave"
+ " it blank.");
+module_param_array(regspacings, int, &num_regspacings, 0);
+MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
+ " and each successive register used by the interface. For"
+ " instance, if the start address is 0xca2 and the spacing"
+ " is 2, then the second address is at 0xca4. Defaults"
+ " to 1.");
+module_param_array(regsizes, int, &num_regsizes, 0);
+MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
+ " This should generally be 1, 2, 4, or 8 for an 8-bit,"
+ " 16-bit, 32-bit, or 64-bit register. Use this if you"
+ " the 8-bit IPMI register has to be read from a larger"
+ " register.");
+module_param_array(regshifts, int, &num_regshifts, 0);
+MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
+ " IPMI register, in bits. For instance, if the data"
+ " is read from a 32-bit word and the IPMI data is in"
+ " bit 8-15, then the shift would be 8");
+module_param_array(slave_addrs, int, &num_slave_addrs, 0);
+MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
+ " the controller. Normally this is 0x20, but can be"
+ " overridden by this parm. This is an array indexed"
+ " by interface number.");
+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.");
+
+
+static void std_irq_cleanup(struct smi_info *info)
+{
+ if (info->si_type == SI_BT)
+ /* Disable the interrupt in the BT interface. */
+ info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0);
+ free_irq(info->irq, info);
+}
+
+static int std_irq_setup(struct smi_info *info)
+{
+ int rv;
+
+ if (!info->irq)
+ return 0;
+
+ if (info->si_type == SI_BT) {
+ rv = request_irq(info->irq,
+ si_bt_irq_handler,
+ IRQF_SHARED,
+ DEVICE_NAME,
+ info);
+ if (!rv)
+ /* Enable the interrupt in the BT interface. */
+ info->io.outputb(&info->io, IPMI_BT_INTMASK_REG,
+ IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
+ } else
+ rv = request_irq(info->irq,
+ si_irq_handler,
+ IRQF_SHARED,
+ DEVICE_NAME,
+ info);
+ if (rv) {
+ dev_warn(info->dev, "%s unable to claim interrupt %d,"
+ " running polled\n",
+ DEVICE_NAME, info->irq);
+ info->irq = 0;
+ } else {
+ info->irq_cleanup = std_irq_cleanup;
+ dev_info(info->dev, "Using irq %d\n", info->irq);
+ }
+
+ return rv;
+}
+
+static unsigned char port_inb(struct si_sm_io *io, unsigned int offset)
+{
+ unsigned int addr = io->addr_data;
+
+ return inb(addr + (offset * io->regspacing));
+}
+
+static void port_outb(struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ unsigned int addr = io->addr_data;
+
+ outb(b, addr + (offset * io->regspacing));
+}
+
+static unsigned char port_inw(struct si_sm_io *io, unsigned int offset)
+{
+ unsigned int addr = io->addr_data;
+
+ return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
+}
+
+static void port_outw(struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ unsigned int addr = io->addr_data;
+
+ outw(b << io->regshift, addr + (offset * io->regspacing));
+}
+
+static unsigned char port_inl(struct si_sm_io *io, unsigned int offset)
+{
+ unsigned int addr = io->addr_data;
+
+ return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
+}
+
+static void port_outl(struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ unsigned int addr = io->addr_data;
+
+ outl(b << io->regshift, addr+(offset * io->regspacing));
+}
+
+static void port_cleanup(struct smi_info *info)
+{
+ unsigned int addr = info->io.addr_data;
+ int idx;
+
+ if (addr) {
+ for (idx = 0; idx < info->io_size; idx++)
+ release_region(addr + idx * info->io.regspacing,
+ info->io.regsize);
+ }
+}
+
+static int port_setup(struct smi_info *info)
+{
+ unsigned int addr = info->io.addr_data;
+ int idx;
+
+ if (!addr)
+ return -ENODEV;
+
+ info->io_cleanup = port_cleanup;
+
+ /*
+ * Figure out the actual inb/inw/inl/etc routine to use based
+ * upon the register size.
+ */
+ switch (info->io.regsize) {
+ case 1:
+ info->io.inputb = port_inb;
+ info->io.outputb = port_outb;
+ break;
+ case 2:
+ info->io.inputb = port_inw;
+ info->io.outputb = port_outw;
+ break;
+ case 4:
+ info->io.inputb = port_inl;
+ info->io.outputb = port_outl;
+ break;
+ default:
+ dev_warn(info->dev, "Invalid register size: %d\n",
+ info->io.regsize);
+ return -EINVAL;
+ }
+
+ /*
+ * Some BIOSes reserve disjoint I/O regions in their ACPI
+ * tables. This causes problems when trying to register the
+ * entire I/O region. Therefore we must register each I/O
+ * port separately.
+ */
+ for (idx = 0; idx < info->io_size; idx++) {
+ if (request_region(addr + idx * info->io.regspacing,
+ info->io.regsize, DEVICE_NAME) == NULL) {
+ /* Undo allocations */
+ while (idx--) {
+ release_region(addr + idx * info->io.regspacing,
+ info->io.regsize);
+ }
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+static unsigned char intf_mem_inb(struct si_sm_io *io, unsigned int offset)
+{
+ return readb((io->addr)+(offset * io->regspacing));
+}
+
+static void intf_mem_outb(struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ writeb(b, (io->addr)+(offset * io->regspacing));
+}
+
+static unsigned char intf_mem_inw(struct si_sm_io *io, unsigned int offset)
+{
+ return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
+ & 0xff;
+}
+
+static void intf_mem_outw(struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
+}
+
+static unsigned char intf_mem_inl(struct si_sm_io *io, unsigned int offset)
+{
+ return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
+ & 0xff;
+}
+
+static void intf_mem_outl(struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
+}
+
+#ifdef readq
+static unsigned char mem_inq(struct si_sm_io *io, unsigned int offset)
+{
+ return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
+ & 0xff;
+}
+
+static void mem_outq(struct si_sm_io *io, unsigned int offset,
+ unsigned char b)
+{
+ writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
+}
+#endif
+
+static void mem_cleanup(struct smi_info *info)
+{
+ unsigned long addr = info->io.addr_data;
+ int mapsize;
+
+ if (info->io.addr) {
+ iounmap(info->io.addr);
+
+ mapsize = ((info->io_size * info->io.regspacing)
+ - (info->io.regspacing - info->io.regsize));
+
+ release_mem_region(addr, mapsize);
+ }
+}
+
+static int mem_setup(struct smi_info *info)
+{
+ unsigned long addr = info->io.addr_data;
+ int mapsize;
+
+ if (!addr)
+ return -ENODEV;
+
+ info->io_cleanup = mem_cleanup;
+
+ /*
+ * Figure out the actual readb/readw/readl/etc routine to use based
+ * upon the register size.
+ */
+ switch (info->io.regsize) {
+ case 1:
+ info->io.inputb = intf_mem_inb;
+ info->io.outputb = intf_mem_outb;
+ break;
+ case 2:
+ info->io.inputb = intf_mem_inw;
+ info->io.outputb = intf_mem_outw;
+ break;
+ case 4:
+ info->io.inputb = intf_mem_inl;
+ info->io.outputb = intf_mem_outl;
+ break;
+#ifdef readq
+ case 8:
+ info->io.inputb = mem_inq;
+ info->io.outputb = mem_outq;
+ break;
+#endif
+ default:
+ dev_warn(info->dev, "Invalid register size: %d\n",
+ info->io.regsize);
+ return -EINVAL;
+ }
+
+ /*
+ * Calculate the total amount of memory to claim. This is an
+ * unusual looking calculation, but it avoids claiming any
+ * more memory than it has to. It will claim everything
+ * between the first address to the end of the last full
+ * register.
+ */
+ mapsize = ((info->io_size * info->io.regspacing)
+ - (info->io.regspacing - info->io.regsize));
+
+ if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL)
+ return -EIO;
+
+ info->io.addr = ioremap(addr, mapsize);
+ if (info->io.addr == NULL) {
+ release_mem_region(addr, mapsize);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * Parms come in as <op1>[:op2[:op3...]]. ops are:
+ * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]]
+ * Options are:
+ * rsp=<regspacing>
+ * rsi=<regsize>
+ * rsh=<regshift>
+ * irq=<irq>
+ * ipmb=<ipmb addr>
+ */
+enum hotmod_op { HM_ADD, HM_REMOVE };
+struct hotmod_vals {
+ char *name;
+ int val;
+};
+static struct hotmod_vals hotmod_ops[] = {
+ { "add", HM_ADD },
+ { "remove", HM_REMOVE },
+ { NULL }
+};
+static struct hotmod_vals hotmod_si[] = {
+ { "kcs", SI_KCS },
+ { "smic", SI_SMIC },
+ { "bt", SI_BT },
+ { NULL }
+};
+static struct hotmod_vals hotmod_as[] = {
+ { "mem", IPMI_MEM_ADDR_SPACE },
+ { "i/o", IPMI_IO_ADDR_SPACE },
+ { NULL }
+};
+
+static int parse_str(struct hotmod_vals *v, int *val, char *name, char **curr)
+{
+ char *s;
+ int i;
+
+ s = strchr(*curr, ',');
+ if (!s) {
+ printk(KERN_WARNING PFX "No hotmod %s given.\n", name);
+ return -EINVAL;
+ }
+ *s = '\0';
+ s++;
+ for (i = 0; v[i].name; i++) {
+ if (strcmp(*curr, v[i].name) == 0) {
+ *val = v[i].val;
+ *curr = s;
+ return 0;
+ }
+ }
+
+ printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr);
+ return -EINVAL;
+}
+
+static int check_hotmod_int_op(const char *curr, const char *option,
+ const char *name, int *val)
+{
+ char *n;
+
+ if (strcmp(curr, name) == 0) {
+ if (!option) {
+ printk(KERN_WARNING PFX
+ "No option given for '%s'\n",
+ curr);
+ return -EINVAL;
+ }
+ *val = simple_strtoul(option, &n, 0);
+ if ((*n != '\0') || (*option == '\0')) {
+ printk(KERN_WARNING PFX
+ "Bad option given for '%s'\n",
+ curr);
+ return -EINVAL;
+ }
+ return 1;
+ }
+ return 0;
+}
+
+static struct smi_info *smi_info_alloc(void)
+{
+ struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
+
+ if (info)
+ spin_lock_init(&info->si_lock);
+ return info;
+}
+
+static int hotmod_handler(const char *val, struct kernel_param *kp)
+{
+ char *str = kstrdup(val, GFP_KERNEL);
+ int rv;
+ char *next, *curr, *s, *n, *o;
+ enum hotmod_op op;
+ enum si_type si_type;
+ int addr_space;
+ unsigned long addr;
+ int regspacing;
+ int regsize;
+ int regshift;
+ int irq;
+ int ipmb;
+ int ival;
+ int len;
+ struct smi_info *info;
+
+ if (!str)
+ return -ENOMEM;
+
+ /* Kill any trailing spaces, as we can get a "\n" from echo. */
+ len = strlen(str);
+ ival = len - 1;
+ while ((ival >= 0) && isspace(str[ival])) {
+ str[ival] = '\0';
+ ival--;
+ }
+
+ for (curr = str; curr; curr = next) {
+ regspacing = 1;
+ regsize = 1;
+ regshift = 0;
+ irq = 0;
+ ipmb = 0; /* Choose the default if not specified */
+
+ next = strchr(curr, ':');
+ if (next) {
+ *next = '\0';
+ next++;
+ }
+
+ rv = parse_str(hotmod_ops, &ival, "operation", &curr);
+ if (rv)
+ break;
+ op = ival;
+
+ rv = parse_str(hotmod_si, &ival, "interface type", &curr);
+ if (rv)
+ break;
+ si_type = ival;
+
+ rv = parse_str(hotmod_as, &addr_space, "address space", &curr);
+ if (rv)
+ break;
+
+ s = strchr(curr, ',');
+ if (s) {
+ *s = '\0';
+ s++;
+ }
+ addr = simple_strtoul(curr, &n, 0);
+ if ((*n != '\0') || (*curr == '\0')) {
+ printk(KERN_WARNING PFX "Invalid hotmod address"
+ " '%s'\n", curr);
+ break;
+ }
+
+ while (s) {
+ curr = s;
+ s = strchr(curr, ',');
+ if (s) {
+ *s = '\0';
+ s++;
+ }
+ o = strchr(curr, '=');
+ if (o) {
+ *o = '\0';
+ o++;
+ }
+ rv = check_hotmod_int_op(curr, o, "rsp", ®spacing);
+ if (rv < 0)
+ goto out;
+ else if (rv)
+ continue;
+ rv = check_hotmod_int_op(curr, o, "rsi", ®size);
+ if (rv < 0)
+ goto out;
+ else if (rv)
+ continue;
+ rv = check_hotmod_int_op(curr, o, "rsh", ®shift);
+ if (rv < 0)
+ goto out;
+ else if (rv)
+ continue;
+ rv = check_hotmod_int_op(curr, o, "irq", &irq);
+ if (rv < 0)
+ goto out;
+ else if (rv)
+ continue;
+ rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb);
+ if (rv < 0)
+ goto out;
+ else if (rv)
+ continue;
+
+ rv = -EINVAL;
+ printk(KERN_WARNING PFX
+ "Invalid hotmod option '%s'\n",
+ curr);
+ goto out;
+ }
+
+ if (op == HM_ADD) {
+ info = smi_info_alloc();
+ if (!info) {
+ rv = -ENOMEM;
+ goto out;
+ }
+
+ info->addr_source = SI_HOTMOD;
+ info->si_type = si_type;
+ info->io.addr_data = addr;
+ info->io.addr_type = addr_space;
+ if (addr_space == IPMI_MEM_ADDR_SPACE)
+ info->io_setup = mem_setup;
+ else
+ info->io_setup = port_setup;
+
+ info->io.addr = NULL;
+ info->io.regspacing = regspacing;
+ if (!info->io.regspacing)
+ info->io.regspacing = DEFAULT_REGSPACING;
+ info->io.regsize = regsize;
+ if (!info->io.regsize)
+ info->io.regsize = DEFAULT_REGSPACING;
+ info->io.regshift = regshift;
+ info->irq = irq;
+ if (info->irq)
+ info->irq_setup = std_irq_setup;
+ info->slave_addr = ipmb;
+
+ rv = add_smi(info);
+ if (rv) {
+ kfree(info);
+ goto out;
+ }
+ rv = try_smi_init(info);
+ if (rv) {
+ cleanup_one_si(info);
+ goto out;
+ }
+ } else {
+ /* remove */
+ struct smi_info *e, *tmp_e;
+
+ mutex_lock(&smi_infos_lock);
+ list_for_each_entry_safe(e, tmp_e, &smi_infos, link) {
+ if (e->io.addr_type != addr_space)
+ continue;
+ if (e->si_type != si_type)
+ continue;
+ if (e->io.addr_data == addr)
+ cleanup_one_si(e);
+ }
+ mutex_unlock(&smi_infos_lock);
+ }
+ }
+ rv = len;
+ out:
+ kfree(str);
+ return rv;
+}
+
+static int hardcode_find_bmc(void)
+{
+ int ret = -ENODEV;
+ int i;
+ struct smi_info *info;
+
+ for (i = 0; i < SI_MAX_PARMS; i++) {
+ if (!ports[i] && !addrs[i])
+ continue;
+
+ info = smi_info_alloc();
+ if (!info)
+ return -ENOMEM;
+
+ info->addr_source = SI_HARDCODED;
+ printk(KERN_INFO PFX "probing via hardcoded address\n");
+
+ if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) {
+ info->si_type = SI_KCS;
+ } else if (strcmp(si_type[i], "smic") == 0) {
+ info->si_type = SI_SMIC;
+ } else if (strcmp(si_type[i], "bt") == 0) {
+ info->si_type = SI_BT;
+ } else {
+ printk(KERN_WARNING PFX "Interface type specified "
+ "for interface %d, was invalid: %s\n",
+ i, si_type[i]);
+ kfree(info);
+ continue;
+ }
+
+ if (ports[i]) {
+ /* An I/O port */
+ info->io_setup = port_setup;
+ info->io.addr_data = ports[i];
+ info->io.addr_type = IPMI_IO_ADDR_SPACE;
+ } else if (addrs[i]) {
+ /* A memory port */
+ info->io_setup = mem_setup;
+ info->io.addr_data = addrs[i];
+ info->io.addr_type = IPMI_MEM_ADDR_SPACE;
+ } else {
+ printk(KERN_WARNING PFX "Interface type specified "
+ "for interface %d, but port and address were "
+ "not set or set to zero.\n", i);
+ kfree(info);
+ continue;
+ }
+
+ info->io.addr = NULL;
+ info->io.regspacing = regspacings[i];
+ if (!info->io.regspacing)
+ info->io.regspacing = DEFAULT_REGSPACING;
+ info->io.regsize = regsizes[i];
+ if (!info->io.regsize)
+ info->io.regsize = DEFAULT_REGSPACING;
+ info->io.regshift = regshifts[i];
+ info->irq = irqs[i];
+ if (info->irq)
+ info->irq_setup = std_irq_setup;
+ info->slave_addr = slave_addrs[i];
+
+ if (!add_smi(info)) {
+ if (try_smi_init(info))
+ cleanup_one_si(info);
+ ret = 0;
+ } else {
+ kfree(info);
+ }
+ }
+ return ret;
+}
+
+#ifdef CONFIG_ACPI
+
+#include <linux/acpi.h>
+
+/*
+ * Once we get an ACPI failure, we don't try any more, because we go
+ * through the tables sequentially. Once we don't find a table, there
+ * are no more.
+ */
+static int acpi_failure;
+
+/* For GPE-type interrupts. */
+static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
+ u32 gpe_number, void *context)
+{
+ struct smi_info *smi_info = context;
+ unsigned long flags;
+
+ spin_lock_irqsave(&(smi_info->si_lock), flags);
+
+ smi_inc_stat(smi_info, interrupts);
+
+ debug_timestamp("ACPI_GPE");
+
+ smi_event_handler(smi_info, 0);
+ spin_unlock_irqrestore(&(smi_info->si_lock), flags);
+
+ return ACPI_INTERRUPT_HANDLED;
+}
+
+static void acpi_gpe_irq_cleanup(struct smi_info *info)
+{
+ if (!info->irq)
+ return;
+
+ acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe);
+}
+
+static int acpi_gpe_irq_setup(struct smi_info *info)
+{
+ acpi_status status;
+
+ if (!info->irq)
+ return 0;
+
+ status = acpi_install_gpe_handler(NULL,
+ info->irq,
+ ACPI_GPE_LEVEL_TRIGGERED,
+ &ipmi_acpi_gpe,
+ info);
+ if (status != AE_OK) {
+ dev_warn(info->dev, "%s unable to claim ACPI GPE %d,"
+ " running polled\n", DEVICE_NAME, info->irq);
+ info->irq = 0;
+ return -EINVAL;
+ } else {
+ info->irq_cleanup = acpi_gpe_irq_cleanup;
+ dev_info(info->dev, "Using ACPI GPE %d\n", info->irq);
+ return 0;
+ }
+}
+
+/*
+ * Defined at
+ * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf
+ */
+struct SPMITable {
+ s8 Signature[4];
+ u32 Length;
+ u8 Revision;
+ u8 Checksum;
+ s8 OEMID[6];
+ s8 OEMTableID[8];
+ s8 OEMRevision[4];
+ s8 CreatorID[4];
+ s8 CreatorRevision[4];
+ u8 InterfaceType;
+ u8 IPMIlegacy;
+ s16 SpecificationRevision;
+
+ /*
+ * Bit 0 - SCI interrupt supported
+ * Bit 1 - I/O APIC/SAPIC
+ */
+ u8 InterruptType;
+
+ /*
+ * If bit 0 of InterruptType is set, then this is the SCI
+ * interrupt in the GPEx_STS register.
+ */
+ u8 GPE;
+
+ s16 Reserved;
+
+ /*
+ * If bit 1 of InterruptType is set, then this is the I/O
+ * APIC/SAPIC interrupt.
+ */
+ u32 GlobalSystemInterrupt;
+
+ /* The actual register address. */
+ struct acpi_generic_address addr;
+
+ u8 UID[4];
+
+ s8 spmi_id[1]; /* A '\0' terminated array starts here. */
+};
+
+static int try_init_spmi(struct SPMITable *spmi)
+{
+ struct smi_info *info;
+ int rv;
+
+ if (spmi->IPMIlegacy != 1) {
+ printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy);
+ return -ENODEV;
+ }
+
+ info = smi_info_alloc();
+ if (!info) {
+ printk(KERN_ERR PFX "Could not allocate SI data (3)\n");
+ return -ENOMEM;
+ }
+
+ info->addr_source = SI_SPMI;
+ printk(KERN_INFO PFX "probing via SPMI\n");
+
+ /* Figure out the interface type. */
+ switch (spmi->InterfaceType) {
+ case 1: /* KCS */
+ info->si_type = SI_KCS;
+ break;
+ case 2: /* SMIC */
+ info->si_type = SI_SMIC;
+ break;
+ case 3: /* BT */
+ info->si_type = SI_BT;
+ break;
+ case 4: /* SSIF, just ignore */
+ kfree(info);
+ return -EIO;
+ default:
+ printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n",
+ spmi->InterfaceType);
+ kfree(info);
+ return -EIO;
+ }
+
+ if (spmi->InterruptType & 1) {
+ /* We've got a GPE interrupt. */
+ info->irq = spmi->GPE;
+ info->irq_setup = acpi_gpe_irq_setup;
+ } else if (spmi->InterruptType & 2) {
+ /* We've got an APIC/SAPIC interrupt. */
+ info->irq = spmi->GlobalSystemInterrupt;
+ info->irq_setup = std_irq_setup;
+ } else {
+ /* Use the default interrupt setting. */
+ info->irq = 0;
+ info->irq_setup = NULL;
+ }
+
+ if (spmi->addr.bit_width) {
+ /* A (hopefully) properly formed register bit width. */
+ info->io.regspacing = spmi->addr.bit_width / 8;
+ } else {
+ info->io.regspacing = DEFAULT_REGSPACING;
+ }
+ info->io.regsize = info->io.regspacing;
+ info->io.regshift = spmi->addr.bit_offset;
+
+ if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+ info->io_setup = mem_setup;
+ info->io.addr_type = IPMI_MEM_ADDR_SPACE;
+ } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
+ info->io_setup = port_setup;
+ info->io.addr_type = IPMI_IO_ADDR_SPACE;
+ } else {
+ kfree(info);
+ printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n");
+ return -EIO;
+ }
+ info->io.addr_data = spmi->addr.address;
+
+ pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n",
+ (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
+ info->io.addr_data, info->io.regsize, info->io.regspacing,
+ info->irq);
+
+ rv = add_smi(info);
+ if (rv)
+ kfree(info);
+
+ return rv;
+}
+
+static void spmi_find_bmc(void)
+{
+ acpi_status status;
+ struct SPMITable *spmi;
+ int i;
+
+ if (acpi_disabled)
+ return;
+
+ if (acpi_failure)
+ return;
+
+ for (i = 0; ; i++) {
+ status = acpi_get_table(ACPI_SIG_SPMI, i+1,
+ (struct acpi_table_header **)&spmi);
+ if (status != AE_OK)
+ return;
+
+ try_init_spmi(spmi);
+ }
+}
+
+static int ipmi_pnp_probe(struct pnp_dev *dev,
+ const struct pnp_device_id *dev_id)
+{
+ struct acpi_device *acpi_dev;
+ struct smi_info *info;
+ struct resource *res, *res_second;
+ acpi_handle handle;
+ acpi_status status;
+ unsigned long long tmp;
+ int rv = -EINVAL;
+
+ acpi_dev = pnp_acpi_device(dev);
+ if (!acpi_dev)
+ return -ENODEV;
+
+ info = smi_info_alloc();
+ if (!info)
+ return -ENOMEM;
+
+ info->addr_source = SI_ACPI;
+ printk(KERN_INFO PFX "probing via ACPI\n");
+
+ handle = acpi_dev->handle;
+ info->addr_info.acpi_info.acpi_handle = handle;
+
+ /* _IFT tells us the interface type: KCS, BT, etc */
+ status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&dev->dev, "Could not find ACPI IPMI interface type\n");
+ goto err_free;
+ }
+
+ switch (tmp) {
+ case 1:
+ info->si_type = SI_KCS;
+ break;
+ case 2:
+ info->si_type = SI_SMIC;
+ break;
+ case 3:
+ info->si_type = SI_BT;
+ break;
+ case 4: /* SSIF, just ignore */
+ rv = -ENODEV;
+ goto err_free;
+ default:
+ dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp);
+ goto err_free;
+ }
+
+ res = pnp_get_resource(dev, IORESOURCE_IO, 0);
+ if (res) {
+ info->io_setup = port_setup;
+ info->io.addr_type = IPMI_IO_ADDR_SPACE;
+ } else {
+ res = pnp_get_resource(dev, IORESOURCE_MEM, 0);
+ if (res) {
+ info->io_setup = mem_setup;
+ info->io.addr_type = IPMI_MEM_ADDR_SPACE;
+ }
+ }
+ if (!res) {
+ dev_err(&dev->dev, "no I/O or memory address\n");
+ goto err_free;
+ }
+ info->io.addr_data = res->start;
+
+ info->io.regspacing = DEFAULT_REGSPACING;
+ res_second = pnp_get_resource(dev,
+ (info->io.addr_type == IPMI_IO_ADDR_SPACE) ?
+ IORESOURCE_IO : IORESOURCE_MEM,
+ 1);
+ if (res_second) {
+ if (res_second->start > info->io.addr_data)
+ info->io.regspacing = res_second->start - info->io.addr_data;
+ }
+ info->io.regsize = DEFAULT_REGSPACING;
+ info->io.regshift = 0;
+
+ /* If _GPE exists, use it; otherwise use standard interrupts */
+ status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
+ if (ACPI_SUCCESS(status)) {
+ info->irq = tmp;
+ info->irq_setup = acpi_gpe_irq_setup;
+ } else if (pnp_irq_valid(dev, 0)) {
+ info->irq = pnp_irq(dev, 0);
+ info->irq_setup = std_irq_setup;
+ }
+
+ info->dev = &dev->dev;
+ pnp_set_drvdata(dev, info);
+
+ dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n",
+ res, info->io.regsize, info->io.regspacing,
+ info->irq);
+
+ rv = add_smi(info);
+ if (rv)
+ kfree(info);
+
+ return rv;
+
+err_free:
+ kfree(info);
+ return rv;
+}
+
+static void ipmi_pnp_remove(struct pnp_dev *dev)
+{
+ struct smi_info *info = pnp_get_drvdata(dev);
+
+ cleanup_one_si(info);
+}
+
+static const struct pnp_device_id pnp_dev_table[] = {
+ {"IPI0001", 0},
+ {"", 0},
+};
+
+static struct pnp_driver ipmi_pnp_driver = {
+ .name = DEVICE_NAME,
+ .probe = ipmi_pnp_probe,
+ .remove = ipmi_pnp_remove,
+ .id_table = pnp_dev_table,
+};
+
+MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
+#endif
+
+#ifdef CONFIG_DMI
+struct dmi_ipmi_data {
+ u8 type;
+ u8 addr_space;
+ unsigned long base_addr;
+ u8 irq;
+ u8 offset;
+ u8 slave_addr;
+};
+
+static int decode_dmi(const struct dmi_header *dm,
+ struct dmi_ipmi_data *dmi)
+{
+ const u8 *data = (const u8 *)dm;
+ unsigned long base_addr;
+ u8 reg_spacing;
+ u8 len = dm->length;
+
+ dmi->type = data[4];
+
+ memcpy(&base_addr, data+8, sizeof(unsigned long));
+ if (len >= 0x11) {
+ if (base_addr & 1) {
+ /* I/O */
+ base_addr &= 0xFFFE;
+ dmi->addr_space = IPMI_IO_ADDR_SPACE;
+ } else
+ /* Memory */
+ dmi->addr_space = IPMI_MEM_ADDR_SPACE;
+
+ /* If bit 4 of byte 0x10 is set, then the lsb for the address
+ is odd. */
+ dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
+
+ dmi->irq = data[0x11];
+
+ /* The top two bits of byte 0x10 hold the register spacing. */
+ reg_spacing = (data[0x10] & 0xC0) >> 6;
+ switch (reg_spacing) {
+ case 0x00: /* Byte boundaries */
+ dmi->offset = 1;
+ break;
+ case 0x01: /* 32-bit boundaries */
+ dmi->offset = 4;
+ break;
+ case 0x02: /* 16-byte boundaries */
+ dmi->offset = 16;
+ break;
+ default:
+ /* Some other interface, just ignore it. */
+ return -EIO;
+ }
+ } else {
+ /* Old DMI spec. */
+ /*
+ * Note that technically, the lower bit of the base
+ * address should be 1 if the address is I/O and 0 if
+ * the address is in memory. So many systems get that
+ * wrong (and all that I have seen are I/O) so we just
+ * ignore that bit and assume I/O. Systems that use
+ * memory should use the newer spec, anyway.
+ */
+ dmi->base_addr = base_addr & 0xfffe;
+ dmi->addr_space = IPMI_IO_ADDR_SPACE;
+ dmi->offset = 1;
+ }
+
+ dmi->slave_addr = data[6];
+
+ return 0;
+}
+
+static void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
+{
+ struct smi_info *info;
+
+ info = smi_info_alloc();
+ if (!info) {
+ printk(KERN_ERR PFX "Could not allocate SI data\n");
+ return;
+ }
+
+ info->addr_source = SI_SMBIOS;
+ printk(KERN_INFO PFX "probing via SMBIOS\n");
+
+ switch (ipmi_data->type) {
+ case 0x01: /* KCS */
+ info->si_type = SI_KCS;
+ break;
+ case 0x02: /* SMIC */
+ info->si_type = SI_SMIC;
+ break;
+ case 0x03: /* BT */
+ info->si_type = SI_BT;
+ break;
+ default:
+ kfree(info);
+ return;
+ }
+
+ switch (ipmi_data->addr_space) {
+ case IPMI_MEM_ADDR_SPACE:
+ info->io_setup = mem_setup;
+ info->io.addr_type = IPMI_MEM_ADDR_SPACE;
+ break;
+
+ case IPMI_IO_ADDR_SPACE:
+ info->io_setup = port_setup;
+ info->io.addr_type = IPMI_IO_ADDR_SPACE;
+ break;
+
+ default:
+ kfree(info);
+ printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n",
+ ipmi_data->addr_space);
+ return;
+ }
+ info->io.addr_data = ipmi_data->base_addr;
+
+ info->io.regspacing = ipmi_data->offset;
+ if (!info->io.regspacing)
+ info->io.regspacing = DEFAULT_REGSPACING;
+ info->io.regsize = DEFAULT_REGSPACING;
+ info->io.regshift = 0;
+
+ info->slave_addr = ipmi_data->slave_addr;
+
+ info->irq = ipmi_data->irq;
+ if (info->irq)
+ info->irq_setup = std_irq_setup;
+
+ pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n",
+ (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
+ info->io.addr_data, info->io.regsize, info->io.regspacing,
+ info->irq);
+
+ if (add_smi(info))
+ kfree(info);
+}
+
+static void dmi_find_bmc(void)
+{
+ const struct dmi_device *dev = NULL;
+ struct dmi_ipmi_data data;
+ int rv;
+
+ while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
+ memset(&data, 0, sizeof(data));
+ rv = decode_dmi((const struct dmi_header *) dev->device_data,
+ &data);
+ if (!rv)
+ try_init_dmi(&data);
+ }
+}
+#endif /* CONFIG_DMI */
+
+#ifdef CONFIG_PCI
+
+#define PCI_ERMC_CLASSCODE 0x0C0700
+#define PCI_ERMC_CLASSCODE_MASK 0xffffff00
+#define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff
+#define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00
+#define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01
+#define PCI_ERMC_CLASSCODE_TYPE_BT 0x02
+
+#define PCI_HP_VENDOR_ID 0x103C
+#define PCI_MMC_DEVICE_ID 0x121A
+#define PCI_MMC_ADDR_CW 0x10
+
+static void ipmi_pci_cleanup(struct smi_info *info)
+{
+ struct pci_dev *pdev = info->addr_source_data;
+
+ pci_disable_device(pdev);
+}
+
+static int ipmi_pci_probe_regspacing(struct smi_info *info)
+{
+ if (info->si_type == SI_KCS) {
+ unsigned char status;
+ int regspacing;
+
+ info->io.regsize = DEFAULT_REGSIZE;
+ info->io.regshift = 0;
+ info->io_size = 2;
+ info->handlers = &kcs_smi_handlers;
+
+ /* detect 1, 4, 16byte spacing */
+ for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) {
+ info->io.regspacing = regspacing;
+ if (info->io_setup(info)) {
+ dev_err(info->dev,
+ "Could not setup I/O space\n");
+ return DEFAULT_REGSPACING;
+ }
+ /* write invalid cmd */
+ info->io.outputb(&info->io, 1, 0x10);
+ /* read status back */
+ status = info->io.inputb(&info->io, 1);
+ info->io_cleanup(info);
+ if (status)
+ return regspacing;
+ regspacing *= 4;
+ }
+ }
+ return DEFAULT_REGSPACING;
+}
+
+static int ipmi_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int rv;
+ int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
+ struct smi_info *info;
+
+ info = smi_info_alloc();
+ if (!info)
+ return -ENOMEM;
+
+ info->addr_source = SI_PCI;
+ dev_info(&pdev->dev, "probing via PCI");
+
+ switch (class_type) {
+ case PCI_ERMC_CLASSCODE_TYPE_SMIC:
+ info->si_type = SI_SMIC;
+ break;
+
+ case PCI_ERMC_CLASSCODE_TYPE_KCS:
+ info->si_type = SI_KCS;
+ break;
+
+ case PCI_ERMC_CLASSCODE_TYPE_BT:
+ info->si_type = SI_BT;
+ break;
+
+ default:
+ kfree(info);
+ dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type);
+ return -ENOMEM;
+ }
+
+ rv = pci_enable_device(pdev);
+ if (rv) {
+ dev_err(&pdev->dev, "couldn't enable PCI device\n");
+ kfree(info);
+ return rv;
+ }
+
+ info->addr_source_cleanup = ipmi_pci_cleanup;
+ info->addr_source_data = pdev;
+
+ if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) {
+ info->io_setup = port_setup;
+ info->io.addr_type = IPMI_IO_ADDR_SPACE;
+ } else {
+ info->io_setup = mem_setup;
+ info->io.addr_type = IPMI_MEM_ADDR_SPACE;
+ }
+ info->io.addr_data = pci_resource_start(pdev, 0);
+
+ info->io.regspacing = ipmi_pci_probe_regspacing(info);
+ info->io.regsize = DEFAULT_REGSIZE;
+ info->io.regshift = 0;
+
+ info->irq = pdev->irq;
+ if (info->irq)
+ info->irq_setup = std_irq_setup;
+
+ info->dev = &pdev->dev;
+ pci_set_drvdata(pdev, info);
+
+ dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n",
+ &pdev->resource[0], info->io.regsize, info->io.regspacing,
+ info->irq);
+
+ rv = add_smi(info);
+ if (rv) {
+ kfree(info);
+ pci_disable_device(pdev);
+ }
+
+ return rv;
+}
+
+static void ipmi_pci_remove(struct pci_dev *pdev)
+{
+ struct smi_info *info = pci_get_drvdata(pdev);
+ cleanup_one_si(info);
+ pci_disable_device(pdev);
+}
+
+static struct pci_device_id ipmi_pci_devices[] = {
+ { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) },
+ { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, ipmi_pci_devices);
+
+static struct pci_driver ipmi_pci_driver = {
+ .name = DEVICE_NAME,
+ .id_table = ipmi_pci_devices,
+ .probe = ipmi_pci_probe,
+ .remove = ipmi_pci_remove,
+};
+#endif /* CONFIG_PCI */
+
+static const struct of_device_id ipmi_match[];
+static int ipmi_probe(struct platform_device *dev)
+{
+#ifdef CONFIG_OF
+ const struct of_device_id *match;
+ struct smi_info *info;
+ struct resource resource;
+ const __be32 *regsize, *regspacing, *regshift;
+ struct device_node *np = dev->dev.of_node;
+ int ret;
+ int proplen;
+
+ dev_info(&dev->dev, "probing via device tree\n");
+
+ match = of_match_device(ipmi_match, &dev->dev);
+ if (!match)
+ return -EINVAL;
+
+ if (!of_device_is_available(np))
+ return -EINVAL;
+
+ ret = of_address_to_resource(np, 0, &resource);
+ if (ret) {
+ dev_warn(&dev->dev, PFX "invalid address from OF\n");
+ return ret;
+ }
+
+ regsize = of_get_property(np, "reg-size", &proplen);
+ if (regsize && proplen != 4) {
+ dev_warn(&dev->dev, PFX "invalid regsize from OF\n");
+ return -EINVAL;
+ }
+
+ regspacing = of_get_property(np, "reg-spacing", &proplen);
+ if (regspacing && proplen != 4) {
+ dev_warn(&dev->dev, PFX "invalid regspacing from OF\n");
+ return -EINVAL;
+ }
+
+ regshift = of_get_property(np, "reg-shift", &proplen);
+ if (regshift && proplen != 4) {
+ dev_warn(&dev->dev, PFX "invalid regshift from OF\n");
+ return -EINVAL;
+ }
+
+ info = smi_info_alloc();
+
+ if (!info) {
+ dev_err(&dev->dev,
+ "could not allocate memory for OF probe\n");
+ return -ENOMEM;
+ }
+
+ info->si_type = (enum si_type) match->data;
+ info->addr_source = SI_DEVICETREE;
+ info->irq_setup = std_irq_setup;
+
+ if (resource.flags & IORESOURCE_IO) {
+ info->io_setup = port_setup;
+ info->io.addr_type = IPMI_IO_ADDR_SPACE;
+ } else {
+ info->io_setup = mem_setup;
+ info->io.addr_type = IPMI_MEM_ADDR_SPACE;
+ }
+
+ info->io.addr_data = resource.start;
+
+ info->io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
+ info->io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
+ info->io.regshift = regshift ? be32_to_cpup(regshift) : 0;
+
+ info->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
+ info->dev = &dev->dev;
+
+ dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
+ info->io.addr_data, info->io.regsize, info->io.regspacing,
+ info->irq);
+
+ dev_set_drvdata(&dev->dev, info);
+
+ ret = add_smi(info);
+ if (ret) {
+ kfree(info);
+ return ret;
+ }
+#endif
+ return 0;
+}
+
+static int ipmi_remove(struct platform_device *dev)
+{
+#ifdef CONFIG_OF
+ cleanup_one_si(dev_get_drvdata(&dev->dev));
+#endif
+ return 0;
+}
+
+static const struct of_device_id ipmi_match[] =
+{
+ { .type = "ipmi", .compatible = "ipmi-kcs",
+ .data = (void *)(unsigned long) SI_KCS },
+ { .type = "ipmi", .compatible = "ipmi-smic",
+ .data = (void *)(unsigned long) SI_SMIC },
+ { .type = "ipmi", .compatible = "ipmi-bt",
+ .data = (void *)(unsigned long) SI_BT },
+ {},
+};
+
+static struct platform_driver ipmi_driver = {
+ .driver = {
+ .name = DEVICE_NAME,
+ .of_match_table = ipmi_match,
+ },
+ .probe = ipmi_probe,
+ .remove = ipmi_remove,
+};
+
+#ifdef CONFIG_PARISC
+static int ipmi_parisc_probe(struct parisc_device *dev)
+{
+ struct smi_info *info;
+ int rv;
+
+ info = smi_info_alloc();
+
+ if (!info) {
+ dev_err(&dev->dev,
+ "could not allocate memory for PARISC probe\n");
+ return -ENOMEM;
+ }
+
+ info->si_type = SI_KCS;
+ info->addr_source = SI_DEVICETREE;
+ info->io_setup = mem_setup;
+ info->io.addr_type = IPMI_MEM_ADDR_SPACE;
+ info->io.addr_data = dev->hpa.start;
+ info->io.regsize = 1;
+ info->io.regspacing = 1;
+ info->io.regshift = 0;
+ info->irq = 0; /* no interrupt */
+ info->irq_setup = NULL;
+ info->dev = &dev->dev;
+
+ dev_dbg(&dev->dev, "addr 0x%lx\n", info->io.addr_data);
+
+ dev_set_drvdata(&dev->dev, info);
+
+ rv = add_smi(info);
+ if (rv) {
+ kfree(info);
+ return rv;
+ }
+
+ return 0;
+}
+
+static int ipmi_parisc_remove(struct parisc_device *dev)
+{
+ cleanup_one_si(dev_get_drvdata(&dev->dev));
+ return 0;
+}
+
+static struct parisc_device_id ipmi_parisc_tbl[] = {
+ { HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
+ { 0, }
+};
+
+static struct parisc_driver ipmi_parisc_driver = {
+ .name = "ipmi",
+ .id_table = ipmi_parisc_tbl,
+ .probe = ipmi_parisc_probe,
+ .remove = ipmi_parisc_remove,
+};
+#endif /* CONFIG_PARISC */
+
+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, resp_len, &smi_info->device_id);
+
+ 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)
+{
+ unsigned char msg[3];
+ unsigned char *resp;
+ unsigned long resp_len;
+ int rv;
+
+ resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
+ if (!resp) {
+ printk(KERN_WARNING PFX "Out of memory allocating response for"
+ " global enables command, cannot check recv irq bit"
+ " handling.\n");
+ return;
+ }
+
+ 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) {
+ printk(KERN_WARNING PFX "Error getting response from get"
+ " global enables command, cannot check recv irq bit"
+ " handling.\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) {
+ printk(KERN_WARNING PFX "Invalid return from get global"
+ " enables command, cannot check recv irq bit"
+ " handling.\n");
+ rv = -EINVAL;
+ goto out;
+ }
+
+ if ((resp[3] & IPMI_BMC_RCV_MSG_INTR) == 0)
+ /* Already clear, should work ok. */
+ goto out;
+
+ msg[0] = IPMI_NETFN_APP_REQUEST << 2;
+ msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
+ msg[2] = resp[3] & ~IPMI_BMC_RCV_MSG_INTR;
+ smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
+
+ rv = wait_for_msg_done(smi_info);
+ if (rv) {
+ printk(KERN_WARNING PFX "Error getting response from set"
+ " global enables command, cannot check recv irq bit"
+ " handling.\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) {
+ printk(KERN_WARNING PFX "Invalid return from get global"
+ " enables command, cannot check recv irq bit"
+ " handling.\n");
+ rv = -EINVAL;
+ goto out;
+ }
+
+ if (resp[2] != 0) {
+ /*
+ * An error when setting the event buffer bit means
+ * clearing the bit is not supported.
+ */
+ printk(KERN_WARNING PFX "The BMC does not support clearing"
+ " the recv irq bit, compensating, but the BMC needs to"
+ " be fixed.\n");
+ smi_info->cannot_clear_recv_irq_bit = true;
+ }
+ out:
+ kfree(resp);
+}
+
+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) {
+ printk(KERN_WARNING PFX "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) {
+ printk(KERN_WARNING PFX "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) {
+ printk(KERN_WARNING PFX "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) {
+ printk(KERN_WARNING PFX "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;
+}
+
+static int smi_type_proc_show(struct seq_file *m, void *v)
+{
+ struct smi_info *smi = m->private;
+
+ seq_printf(m, "%s\n", si_to_str[smi->si_type]);
+
+ return 0;
+}
+
+static int smi_type_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, smi_type_proc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations smi_type_proc_ops = {
+ .open = smi_type_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int smi_si_stats_proc_show(struct seq_file *m, void *v)
+{
+ struct smi_info *smi = m->private;
+
+ seq_printf(m, "interrupts_enabled: %d\n",
+ smi->irq && !smi->interrupt_disabled);
+ seq_printf(m, "short_timeouts: %u\n",
+ smi_get_stat(smi, short_timeouts));
+ seq_printf(m, "long_timeouts: %u\n",
+ smi_get_stat(smi, long_timeouts));
+ seq_printf(m, "idles: %u\n",
+ smi_get_stat(smi, idles));
+ seq_printf(m, "interrupts: %u\n",
+ smi_get_stat(smi, interrupts));
+ seq_printf(m, "attentions: %u\n",
+ smi_get_stat(smi, attentions));
+ seq_printf(m, "flag_fetches: %u\n",
+ smi_get_stat(smi, flag_fetches));
+ seq_printf(m, "hosed_count: %u\n",
+ smi_get_stat(smi, hosed_count));
+ seq_printf(m, "complete_transactions: %u\n",
+ smi_get_stat(smi, complete_transactions));
+ seq_printf(m, "events: %u\n",
+ smi_get_stat(smi, events));
+ seq_printf(m, "watchdog_pretimeouts: %u\n",
+ smi_get_stat(smi, watchdog_pretimeouts));
+ seq_printf(m, "incoming_messages: %u\n",
+ smi_get_stat(smi, incoming_messages));
+ return 0;
+}
+
+static int smi_si_stats_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations smi_si_stats_proc_ops = {
+ .open = smi_si_stats_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int smi_params_proc_show(struct seq_file *m, void *v)
+{
+ struct smi_info *smi = m->private;
+
+ seq_printf(m,
+ "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n",
+ si_to_str[smi->si_type],
+ addr_space_to_str[smi->io.addr_type],
+ smi->io.addr_data,
+ smi->io.regspacing,
+ smi->io.regsize,
+ smi->io.regshift,
+ smi->irq,
+ smi->slave_addr);
+
+ return 0;
+}
+
+static int smi_params_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, smi_params_proc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations smi_params_proc_ops = {
+ .open = smi_params_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/*
+ * 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->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 inline void wait_for_timer_and_thread(struct smi_info *smi_info)
+{
+ if (smi_info->thread != NULL)
+ kthread_stop(smi_info->thread);
+ if (smi_info->timer_running)
+ del_timer_sync(&smi_info->si_timer);
+}
+
+static struct ipmi_default_vals
+{
+ int type;
+ int port;
+} ipmi_defaults[] =
+{
+ { .type = SI_KCS, .port = 0xca2 },
+ { .type = SI_SMIC, .port = 0xca9 },
+ { .type = SI_BT, .port = 0xe4 },
+ { .port = 0 }
+};
+
+static void default_find_bmc(void)
+{
+ struct smi_info *info;
+ int i;
+
+ for (i = 0; ; i++) {
+ if (!ipmi_defaults[i].port)
+ break;
+#ifdef CONFIG_PPC
+ if (check_legacy_ioport(ipmi_defaults[i].port))
+ continue;
+#endif
+ info = smi_info_alloc();
+ if (!info)
+ return;
+
+ info->addr_source = SI_DEFAULT;
+
+ info->si_type = ipmi_defaults[i].type;
+ info->io_setup = port_setup;
+ info->io.addr_data = ipmi_defaults[i].port;
+ info->io.addr_type = IPMI_IO_ADDR_SPACE;
+
+ info->io.addr = NULL;
+ info->io.regspacing = DEFAULT_REGSPACING;
+ info->io.regsize = DEFAULT_REGSPACING;
+ info->io.regshift = 0;
+
+ if (add_smi(info) == 0) {
+ if ((try_smi_init(info)) == 0) {
+ /* Found one... */
+ printk(KERN_INFO PFX "Found default %s"
+ " state machine at %s address 0x%lx\n",
+ si_to_str[info->si_type],
+ addr_space_to_str[info->io.addr_type],
+ info->io.addr_data);
+ } else
+ cleanup_one_si(info);
+ } else {
+ kfree(info);
+ }
+ }
+}
+
+static int is_new_interface(struct smi_info *info)
+{
+ struct smi_info *e;
+
+ list_for_each_entry(e, &smi_infos, link) {
+ if (e->io.addr_type != info->io.addr_type)
+ continue;
+ if (e->io.addr_data == info->io.addr_data)
+ return 0;
+ }
+
+ return 1;
+}
+
+static int add_smi(struct smi_info *new_smi)
+{
+ int rv = 0;
+
+ printk(KERN_INFO PFX "Adding %s-specified %s state machine",
+ ipmi_addr_src_to_str(new_smi->addr_source),
+ si_to_str[new_smi->si_type]);
+ mutex_lock(&smi_infos_lock);
+ if (!is_new_interface(new_smi)) {
+ printk(KERN_CONT " duplicate interface\n");
+ rv = -EBUSY;
+ goto out_err;
+ }
+
+ printk(KERN_CONT "\n");
+
+ /* So we know not to free it unless we have allocated one. */
+ new_smi->intf = NULL;
+ new_smi->si_sm = NULL;
+ new_smi->handlers = NULL;
+
+ list_add_tail(&new_smi->link, &smi_infos);
+
+out_err:
+ mutex_unlock(&smi_infos_lock);
+ return rv;
+}
+
+static int try_smi_init(struct smi_info *new_smi)
+{
+ int rv = 0;
+ int i;
+
+ printk(KERN_INFO PFX "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->addr_source),
+ si_to_str[new_smi->si_type],
+ addr_space_to_str[new_smi->io.addr_type],
+ new_smi->io.addr_data,
+ new_smi->slave_addr, new_smi->irq);
+
+ switch (new_smi->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;
+ }
+
+ /* 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) {
+ printk(KERN_ERR PFX
+ "Could not allocate state machine memory\n");
+ rv = -ENOMEM;
+ goto out_err;
+ }
+ new_smi->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_setup(new_smi);
+ if (rv) {
+ printk(KERN_ERR PFX "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->addr_source)
+ printk(KERN_INFO PFX "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->addr_source)
+ printk(KERN_INFO PFX "There appears to be no BMC"
+ " at this location\n");
+ goto out_err;
+ }
+
+ check_clr_rcv_irq(new_smi);
+
+ setup_oem_data_handler(new_smi);
+ setup_xaction_handlers(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);
+ new_smi->intf_num = smi_num;
+ smi_num++;
+
+ 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->irq) {
+ new_smi->interrupt_disabled = false;
+ atomic_set(&new_smi->req_events, 1);
+ }
+
+ if (!new_smi->dev) {
+ /*
+ * If we don't already have a device from something
+ * else (like PCI), then register a new one.
+ */
+ new_smi->pdev = platform_device_alloc("ipmi_si",
+ new_smi->intf_num);
+ if (!new_smi->pdev) {
+ printk(KERN_ERR PFX
+ "Unable to allocate platform device\n");
+ goto out_err;
+ }
+ new_smi->dev = &new_smi->pdev->dev;
+ new_smi->dev->driver = &ipmi_driver.driver;
+
+ rv = platform_device_add(new_smi->pdev);
+ if (rv) {
+ printk(KERN_ERR PFX
+ "Unable to register system interface device:"
+ " %d\n",
+ rv);
+ goto out_err;
+ }
+ new_smi->dev_registered = true;
+ }
+
+ rv = ipmi_register_smi(&handlers,
+ new_smi,
+ &new_smi->device_id,
+ new_smi->dev,
+ new_smi->slave_addr);
+ if (rv) {
+ dev_err(new_smi->dev, "Unable to register device: error %d\n",
+ rv);
+ goto out_err_stop_timer;
+ }
+
+ rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
+ &smi_type_proc_ops,
+ new_smi);
+ if (rv) {
+ dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
+ goto out_err_stop_timer;
+ }
+
+ rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
+ &smi_si_stats_proc_ops,
+ new_smi);
+ if (rv) {
+ dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
+ goto out_err_stop_timer;
+ }
+
+ rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
+ &smi_params_proc_ops,
+ new_smi);
+ if (rv) {
+ dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv);
+ goto out_err_stop_timer;
+ }
+
+ dev_info(new_smi->dev, "IPMI %s interface initialized\n",
+ si_to_str[new_smi->si_type]);
+
+ return 0;
+
+ out_err_stop_timer:
+ wait_for_timer_and_thread(new_smi);
+
+ out_err:
+ new_smi->interrupt_disabled = true;
+
+ if (new_smi->intf) {
+ ipmi_smi_t intf = new_smi->intf;
+ new_smi->intf = NULL;
+ ipmi_unregister_smi(intf);
+ }
+
+ if (new_smi->irq_cleanup) {
+ new_smi->irq_cleanup(new_smi);
+ new_smi->irq_cleanup = NULL;
+ }
+
+ /*
+ * Wait until we know that we are out of any interrupt
+ * handlers might have been running before we freed the
+ * interrupt.
+ */
+ synchronize_sched();
+
+ if (new_smi->si_sm) {
+ if (new_smi->handlers)
+ new_smi->handlers->cleanup(new_smi->si_sm);
+ kfree(new_smi->si_sm);
+ new_smi->si_sm = NULL;
+ }
+ if (new_smi->addr_source_cleanup) {
+ new_smi->addr_source_cleanup(new_smi);
+ new_smi->addr_source_cleanup = NULL;
+ }
+ if (new_smi->io_cleanup) {
+ new_smi->io_cleanup(new_smi);
+ new_smi->io_cleanup = NULL;
+ }
+
+ if (new_smi->dev_registered) {
+ platform_device_unregister(new_smi->pdev);
+ new_smi->dev_registered = false;
+ }
+
+ return rv;
+}
+
+static int init_ipmi_si(void)
+{
+ int i;
+ char *str;
+ int rv;
+ struct smi_info *e;
+ enum ipmi_addr_src type = SI_INVALID;
+
+ if (initialized)
+ return 0;
+ initialized = 1;
+
+ if (si_tryplatform) {
+ rv = platform_driver_register(&ipmi_driver);
+ if (rv) {
+ printk(KERN_ERR PFX "Unable to register "
+ "driver: %d\n", rv);
+ return rv;
+ }
+ }
+
+ /* Parse out the si_type string into its components. */
+ str = si_type_str;
+ if (*str != '\0') {
+ for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) {
+ si_type[i] = str;
+ str = strchr(str, ',');
+ if (str) {
+ *str = '\0';
+ str++;
+ } else {
+ break;
+ }
+ }
+ }
+
+ printk(KERN_INFO "IPMI System Interface driver.\n");
+
+ /* If the user gave us a device, they presumably want us to use it */
+ if (!hardcode_find_bmc())
+ return 0;
+
+#ifdef CONFIG_PCI
+ if (si_trypci) {
+ rv = pci_register_driver(&ipmi_pci_driver);
+ if (rv)
+ printk(KERN_ERR PFX "Unable to register "
+ "PCI driver: %d\n", rv);
+ else
+ pci_registered = true;
+ }
+#endif
+
+#ifdef CONFIG_ACPI
+ if (si_tryacpi) {
+ pnp_register_driver(&ipmi_pnp_driver);
+ pnp_registered = true;
+ }
+#endif
+
+#ifdef CONFIG_DMI
+ if (si_trydmi)
+ dmi_find_bmc();
+#endif
+
+#ifdef CONFIG_ACPI
+ if (si_tryacpi)
+ spmi_find_bmc();
+#endif
+
+#ifdef CONFIG_PARISC
+ register_parisc_driver(&ipmi_parisc_driver);
+ parisc_registered = true;
+ /* poking PC IO addresses will crash machine, don't do it */
+ si_trydefaults = 0;
+#endif
+
+ /* 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->irq && (!type || e->addr_source == type)) {
+ if (!try_smi_init(e)) {
+ type = e->addr_source;
+ }
+ }
+ }
+
+ /* type will only have been set if we successfully registered an si */
+ if (type) {
+ mutex_unlock(&smi_infos_lock);
+ return 0;
+ }
+
+ /* Fall back to the preferred device */
+
+ list_for_each_entry(e, &smi_infos, link) {
+ if (!e->irq && (!type || e->addr_source == type)) {
+ if (!try_smi_init(e)) {
+ type = e->addr_source;
+ }
+ }
+ }
+ mutex_unlock(&smi_infos_lock);
+
+ if (type)
+ return 0;
+
+ if (si_trydefaults) {
+ mutex_lock(&smi_infos_lock);
+ if (list_empty(&smi_infos)) {
+ /* No BMC was found, try defaults. */
+ mutex_unlock(&smi_infos_lock);
+ default_find_bmc();
+ } else
+ mutex_unlock(&smi_infos_lock);
+ }
+
+ mutex_lock(&smi_infos_lock);
+ if (unload_when_empty && list_empty(&smi_infos)) {
+ mutex_unlock(&smi_infos_lock);
+ cleanup_ipmi_si();
+ printk(KERN_WARNING PFX
+ "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 cleanup_one_si(struct smi_info *to_clean)
+{
+ int rv = 0;
+
+ if (!to_clean)
+ return;
+
+ if (to_clean->intf) {
+ ipmi_smi_t intf = to_clean->intf;
+
+ to_clean->intf = NULL;
+ rv = ipmi_unregister_smi(intf);
+ if (rv) {
+ pr_err(PFX "Unable to unregister device: errno=%d\n",
+ rv);
+ }
+ }
+
+ if (to_clean->dev)
+ dev_set_drvdata(to_clean->dev, NULL);
+
+ list_del(&to_clean->link);
+
+ /*
+ * Make sure that interrupts, the timer and the thread are
+ * stopped and will not run again.
+ */
+ if (to_clean->irq_cleanup)
+ to_clean->irq_cleanup(to_clean);
+ wait_for_timer_and_thread(to_clean);
+
+ /*
+ * 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 (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
+ poll(to_clean);
+ schedule_timeout_uninterruptible(1);
+ }
+ disable_si_irq(to_clean);
+ while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
+ poll(to_clean);
+ schedule_timeout_uninterruptible(1);
+ }
+
+ if (to_clean->handlers)
+ to_clean->handlers->cleanup(to_clean->si_sm);
+
+ kfree(to_clean->si_sm);
+
+ if (to_clean->addr_source_cleanup)
+ to_clean->addr_source_cleanup(to_clean);
+ if (to_clean->io_cleanup)
+ to_clean->io_cleanup(to_clean);
+
+ if (to_clean->dev_registered)
+ platform_device_unregister(to_clean->pdev);
+
+ kfree(to_clean);
+}
+
+static void cleanup_ipmi_si(void)
+{
+ struct smi_info *e, *tmp_e;
+
+ if (!initialized)
+ return;
+
+#ifdef CONFIG_PCI
+ if (pci_registered)
+ pci_unregister_driver(&ipmi_pci_driver);
+#endif
+#ifdef CONFIG_ACPI
+ if (pnp_registered)
+ pnp_unregister_driver(&ipmi_pnp_driver);
+#endif
+#ifdef CONFIG_PARISC
+ if (parisc_registered)
+ unregister_parisc_driver(&ipmi_parisc_driver);
+#endif
+
+ platform_driver_unregister(&ipmi_driver);
+
+ 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);
+}
+module_exit(cleanup_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.");
Code Review / kvmfornfv.git / blobdiff