diff options
Diffstat (limited to 'drivers/char/ipmi/ipmi_si_intf.c')
| -rw-r--r-- | drivers/char/ipmi/ipmi_si_intf.c | 3874 |
1 files changed, 3874 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c new file mode 100644 index 000000000..8a45e92ff --- /dev/null +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -0,0 +1,3874 @@ +/* + * 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."); |