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linux/drivers/char/ipmi/ipmi_ssif.c

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/*
* ipmi_ssif.c
*
* The interface to the IPMI driver for SMBus access to a SMBus
* compliant device. Called SSIF by the IPMI spec.
*
* Author: Intel Corporation
* Todd Davis <todd.c.davis@intel.com>
*
* Rewritten by Corey Minyard <minyard@acm.org> to support the
* non-blocking I2C interface, add support for multi-part
* transactions, add PEC support, and general clenaup.
*
* Copyright 2003 Intel Corporation
* Copyright 2005 MontaVista Software
*
* 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 file holds the "policy" for the interface to the SSIF state
* machine. It does the configuration, handles timers and interrupts,
* and drives the real SSIF state machine.
*/
/*
* TODO: Figure out how to use SMB alerts. This will require a new
* interface into the I2C driver, I believe.
*/
#if defined(MODVERSIONS)
#include <linux/modversions.h>
#endif
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/ipmi_smi.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/kthread.h>
#include <linux/acpi.h>
#include <linux/ctype.h>
#define PFX "ipmi_ssif: "
#define DEVICE_NAME "ipmi_ssif"
#define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57
#define SSIF_IPMI_REQUEST 2
#define SSIF_IPMI_MULTI_PART_REQUEST_START 6
#define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7
#define SSIF_IPMI_RESPONSE 3
#define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9
/* ssif_debug is a bit-field
* SSIF_DEBUG_MSG - commands and their responses
* SSIF_DEBUG_STATES - message states
* SSIF_DEBUG_TIMING - Measure times between events in the driver
*/
#define SSIF_DEBUG_TIMING 4
#define SSIF_DEBUG_STATE 2
#define SSIF_DEBUG_MSG 1
#define SSIF_NODEBUG 0
#define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG)
/*
* Timer values
*/
#define SSIF_MSG_USEC 20000 /* 20ms between message tries. */
#define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */
/* How many times to we retry sending/receiving the message. */
#define SSIF_SEND_RETRIES 5
#define SSIF_RECV_RETRIES 250
#define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000)
#define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
#define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
enum ssif_intf_state {
SSIF_NORMAL,
SSIF_GETTING_FLAGS,
SSIF_GETTING_EVENTS,
SSIF_CLEARING_FLAGS,
SSIF_GETTING_MESSAGES,
/* FIXME - add watchdog stuff. */
};
#define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \
&& (ssif)->curr_msg == NULL)
/*
* Indexes into stats[] in ssif_info below.
*/
enum ssif_stat_indexes {
/* Number of total messages sent. */
SSIF_STAT_sent_messages = 0,
/*
* Number of message parts sent. Messages may be broken into
* parts if they are long.
*/
SSIF_STAT_sent_messages_parts,
/*
* Number of time a message was retried.
*/
SSIF_STAT_send_retries,
/*
* Number of times the send of a message failed.
*/
SSIF_STAT_send_errors,
/*
* Number of message responses received.
*/
SSIF_STAT_received_messages,
/*
* Number of message fragments received.
*/
SSIF_STAT_received_message_parts,
/*
* Number of times the receive of a message was retried.
*/
SSIF_STAT_receive_retries,
/*
* Number of errors receiving messages.
*/
SSIF_STAT_receive_errors,
/*
* Number of times a flag fetch was requested.
*/
SSIF_STAT_flag_fetches,
/*
* Number of times the hardware didn't follow the state machine.
*/
SSIF_STAT_hosed,
/*
* Number of received events.
*/
SSIF_STAT_events,
/* Number of asyncronous messages received. */
SSIF_STAT_incoming_messages,
/* Number of watchdog pretimeouts. */
SSIF_STAT_watchdog_pretimeouts,
/* Number of alers received. */
SSIF_STAT_alerts,
/* Always add statistics before this value, it must be last. */
SSIF_NUM_STATS
};
struct ssif_addr_info {
unsigned short addr;
struct i2c_board_info binfo;
char *adapter_name;
int debug;
int slave_addr;
enum ipmi_addr_src addr_src;
union ipmi_smi_info_union addr_info;
struct mutex clients_mutex;
struct list_head clients;
struct list_head link;
};
struct ssif_info;
typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
unsigned char *data, unsigned int len);
struct ssif_info {
ipmi_smi_t intf;
int intf_num;
spinlock_t lock;
struct ipmi_smi_msg *waiting_msg;
struct ipmi_smi_msg *curr_msg;
enum ssif_intf_state ssif_state;
unsigned long ssif_debug;
struct ipmi_smi_handlers handlers;
enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
union ipmi_smi_info_union addr_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
unsigned char msg_flags;
u8 global_enables;
bool has_event_buffer;
bool supports_alert;
/*
* Used to tell what we should do with alerts. If we are
* waiting on a response, read the data immediately.
*/
bool got_alert;
bool waiting_alert;
/*
* If set to true, this will request events the next time the
* state machine is idle.
*/
bool req_events;
/*
* If set to true, this will request flags the next time the
* state machine is idle.
*/
bool req_flags;
/*
* Used to perform timer operations when run-to-completion
* mode is on. This is a countdown timer.
*/
int rtc_us_timer;
/* Used for sending/receiving data. +1 for the length. */
unsigned char data[IPMI_MAX_MSG_LENGTH + 1];
unsigned int data_len;
/* Temp receive buffer, gets copied into data. */
unsigned char recv[I2C_SMBUS_BLOCK_MAX];
struct i2c_client *client;
ssif_i2c_done done_handler;
/* Thread interface handling */
struct task_struct *thread;
struct completion wake_thread;
bool stopping;
int i2c_read_write;
int i2c_command;
unsigned char *i2c_data;
unsigned int i2c_size;
/* From the device id response. */
struct ipmi_device_id device_id;
struct timer_list retry_timer;
int retries_left;
/* Info from SSIF cmd */
unsigned char max_xmit_msg_size;
unsigned char max_recv_msg_size;
unsigned int multi_support;
int supports_pec;
#define SSIF_NO_MULTI 0
#define SSIF_MULTI_2_PART 1
#define SSIF_MULTI_n_PART 2
unsigned char *multi_data;
unsigned int multi_len;
unsigned int multi_pos;
atomic_t stats[SSIF_NUM_STATS];
};
#define ssif_inc_stat(ssif, stat) \
atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
#define ssif_get_stat(ssif, stat) \
((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
static bool initialized;
static atomic_t next_intf = ATOMIC_INIT(0);
static void return_hosed_msg(struct ssif_info *ssif_info,
struct ipmi_smi_msg *msg);
static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
static int start_send(struct ssif_info *ssif_info,
unsigned char *data,
unsigned int len);
static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info,
unsigned long *flags)
{
spin_lock_irqsave(&ssif_info->lock, *flags);
return flags;
}
static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info,
unsigned long *flags)
{
spin_unlock_irqrestore(&ssif_info->lock, *flags);
}
static void deliver_recv_msg(struct ssif_info *ssif_info,
struct ipmi_smi_msg *msg)
{
ipmi_smi_t intf = ssif_info->intf;
if (!intf) {
ipmi_free_smi_msg(msg);
} else if (msg->rsp_size < 0) {
return_hosed_msg(ssif_info, msg);
pr_err(PFX
"Malformed message in deliver_recv_msg: rsp_size = %d\n",
msg->rsp_size);
} else {
ipmi_smi_msg_received(intf, msg);
}
}
static void return_hosed_msg(struct ssif_info *ssif_info,
struct ipmi_smi_msg *msg)
{
ssif_inc_stat(ssif_info, hosed);
/* Make it a response */
msg->rsp[0] = msg->data[0] | 4;
msg->rsp[1] = msg->data[1];
msg->rsp[2] = 0xFF; /* Unknown error. */
msg->rsp_size = 3;
deliver_recv_msg(ssif_info, msg);
}
/*
* Must be called with the message lock held. This will release the
* message lock. Note that the caller will check SSIF_IDLE and start a
* new operation, so there is no need to check for new messages to
* start in here.
*/
static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags)
{
unsigned char msg[3];
ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
ssif_info->ssif_state = SSIF_CLEARING_FLAGS;
ipmi_ssif_unlock_cond(ssif_info, flags);
/* 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;
if (start_send(ssif_info, msg, 3) != 0) {
/* Error, just go to normal state. */
ssif_info->ssif_state = SSIF_NORMAL;
}
}
static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags)
{
unsigned char mb[2];
ssif_info->req_flags = false;
ssif_info->ssif_state = SSIF_GETTING_FLAGS;
ipmi_ssif_unlock_cond(ssif_info, flags);
mb[0] = (IPMI_NETFN_APP_REQUEST << 2);
mb[1] = IPMI_GET_MSG_FLAGS_CMD;
if (start_send(ssif_info, mb, 2) != 0)
ssif_info->ssif_state = SSIF_NORMAL;
}
static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags,
struct ipmi_smi_msg *msg)
{
if (start_send(ssif_info, msg->data, msg->data_size) != 0) {
unsigned long oflags;
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
ssif_info->curr_msg = NULL;
ssif_info->ssif_state = SSIF_NORMAL;
ipmi_ssif_unlock_cond(ssif_info, flags);
ipmi_free_smi_msg(msg);
}
}
static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags)
{
struct ipmi_smi_msg *msg;
ssif_info->req_events = false;
msg = ipmi_alloc_smi_msg();
if (!msg) {
ssif_info->ssif_state = SSIF_NORMAL;
return;
}
ssif_info->curr_msg = msg;
ssif_info->ssif_state = SSIF_GETTING_EVENTS;
ipmi_ssif_unlock_cond(ssif_info, flags);
msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
msg->data_size = 2;
check_start_send(ssif_info, flags, msg);
}
static void start_recv_msg_fetch(struct ssif_info *ssif_info,
unsigned long *flags)
{
struct ipmi_smi_msg *msg;
msg = ipmi_alloc_smi_msg();
if (!msg) {
ssif_info->ssif_state = SSIF_NORMAL;
return;
}
ssif_info->curr_msg = msg;
ssif_info->ssif_state = SSIF_GETTING_MESSAGES;
ipmi_ssif_unlock_cond(ssif_info, flags);
msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
msg->data[1] = IPMI_GET_MSG_CMD;
msg->data_size = 2;
check_start_send(ssif_info, flags, msg);
}
/*
* Must be called with the message lock held. This will release the
* message lock. Note that the caller will check SSIF_IDLE and start a
* new operation, so there is no need to check for new messages to
* start in here.
*/
static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
{
if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
ipmi_smi_t intf = ssif_info->intf;
/* Watchdog pre-timeout */
ssif_inc_stat(ssif_info, watchdog_pretimeouts);
start_clear_flags(ssif_info, flags);
if (intf)
ipmi_smi_watchdog_pretimeout(intf);
} else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL)
/* Messages available. */
start_recv_msg_fetch(ssif_info, flags);
else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL)
/* Events available. */
start_event_fetch(ssif_info, flags);
else {
ssif_info->ssif_state = SSIF_NORMAL;
ipmi_ssif_unlock_cond(ssif_info, flags);
}
}
static int ipmi_ssif_thread(void *data)
{
struct ssif_info *ssif_info = data;
while (!kthread_should_stop()) {
int result;
/* Wait for something to do */
result = wait_for_completion_interruptible(
&ssif_info->wake_thread);
if (ssif_info->stopping)
break;
if (result == -ERESTARTSYS)
continue;
init_completion(&ssif_info->wake_thread);
if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
result = i2c_smbus_write_block_data(
ssif_info->client, ssif_info->i2c_command,
ssif_info->i2c_data[0],
ssif_info->i2c_data + 1);
ssif_info->done_handler(ssif_info, result, NULL, 0);
} else {
result = i2c_smbus_read_block_data(
ssif_info->client, ssif_info->i2c_command,
ssif_info->i2c_data);
if (result < 0)
ssif_info->done_handler(ssif_info, result,
NULL, 0);
else
ssif_info->done_handler(ssif_info, 0,
ssif_info->i2c_data,
result);
}
}
return 0;
}
static int ssif_i2c_send(struct ssif_info *ssif_info,
ssif_i2c_done handler,
int read_write, int command,
unsigned char *data, unsigned int size)
{
ssif_info->done_handler = handler;
ssif_info->i2c_read_write = read_write;
ssif_info->i2c_command = command;
ssif_info->i2c_data = data;
ssif_info->i2c_size = size;
complete(&ssif_info->wake_thread);
return 0;
}
static void msg_done_handler(struct ssif_info *ssif_info, int result,
unsigned char *data, unsigned int len);
static void start_get(struct ssif_info *ssif_info)
{
int rv;
ssif_info->rtc_us_timer = 0;
ssif_info->multi_pos = 0;
rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
SSIF_IPMI_RESPONSE,
ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
if (rv < 0) {
/* request failed, just return the error. */
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info("Error from i2c_non_blocking_op(5)\n");
msg_done_handler(ssif_info, -EIO, NULL, 0);
}
}
static void retry_timeout(unsigned long data)
{
struct ssif_info *ssif_info = (void *) data;
unsigned long oflags, *flags;
bool waiting;
if (ssif_info->stopping)
return;
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
waiting = ssif_info->waiting_alert;
ssif_info->waiting_alert = false;
ipmi_ssif_unlock_cond(ssif_info, flags);
if (waiting)
start_get(ssif_info);
}
static void ssif_alert(struct i2c_client *client, unsigned int data)
{
struct ssif_info *ssif_info = i2c_get_clientdata(client);
unsigned long oflags, *flags;
bool do_get = false;
ssif_inc_stat(ssif_info, alerts);
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
if (ssif_info->waiting_alert) {
ssif_info->waiting_alert = false;
del_timer(&ssif_info->retry_timer);
do_get = true;
} else if (ssif_info->curr_msg) {
ssif_info->got_alert = true;
}
ipmi_ssif_unlock_cond(ssif_info, flags);
if (do_get)
start_get(ssif_info);
}
static int start_resend(struct ssif_info *ssif_info);
static void msg_done_handler(struct ssif_info *ssif_info, int result,
unsigned char *data, unsigned int len)
{
struct ipmi_smi_msg *msg;
unsigned long oflags, *flags;
int rv;
/*
* We are single-threaded here, so no need for a lock until we
* start messing with driver states or the queues.
*/
if (result < 0) {
ssif_info->retries_left--;
if (ssif_info->retries_left > 0) {
ssif_inc_stat(ssif_info, receive_retries);
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
ssif_info->waiting_alert = true;
ssif_info->rtc_us_timer = SSIF_MSG_USEC;
mod_timer(&ssif_info->retry_timer,
jiffies + SSIF_MSG_JIFFIES);
ipmi_ssif_unlock_cond(ssif_info, flags);
return;
}
ssif_inc_stat(ssif_info, receive_errors);
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info("Error in msg_done_handler: %d\n", result);
len = 0;
goto continue_op;
}
if ((len > 1) && (ssif_info->multi_pos == 0)
&& (data[0] == 0x00) && (data[1] == 0x01)) {
/* Start of multi-part read. Start the next transaction. */
int i;
ssif_inc_stat(ssif_info, received_message_parts);
/* Remove the multi-part read marker. */
len -= 2;
for (i = 0; i < len; i++)
ssif_info->data[i] = data[i+2];
ssif_info->multi_len = len;
ssif_info->multi_pos = 1;
rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
if (rv < 0) {
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info("Error from i2c_non_blocking_op(1)\n");
result = -EIO;
} else
return;
} else if (ssif_info->multi_pos) {
/* Middle of multi-part read. Start the next transaction. */
int i;
unsigned char blocknum;
if (len == 0) {
result = -EIO;
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info(PFX "Middle message with no data\n");
goto continue_op;
}
blocknum = data[0];
if (ssif_info->multi_len + len - 1 > IPMI_MAX_MSG_LENGTH) {
/* Received message too big, abort the operation. */
result = -E2BIG;
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info("Received message too big\n");
goto continue_op;
}
/* Remove the blocknum from the data. */
len--;
for (i = 0; i < len; i++)
ssif_info->data[i + ssif_info->multi_len] = data[i + 1];
ssif_info->multi_len += len;
if (blocknum == 0xff) {
/* End of read */
len = ssif_info->multi_len;
data = ssif_info->data;
} else if (blocknum + 1 != ssif_info->multi_pos) {
/*
* Out of sequence block, just abort. Block
* numbers start at zero for the second block,
* but multi_pos starts at one, so the +1.
*/
result = -EIO;
} else {
ssif_inc_stat(ssif_info, received_message_parts);
ssif_info->multi_pos++;
rv = ssif_i2c_send(ssif_info, msg_done_handler,
I2C_SMBUS_READ,
SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
ssif_info->recv,
I2C_SMBUS_BLOCK_DATA);
if (rv < 0) {
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info(PFX
"Error from ssif_i2c_send\n");
result = -EIO;
} else
return;
}
}
if (result < 0) {
ssif_inc_stat(ssif_info, receive_errors);
} else {
ssif_inc_stat(ssif_info, received_messages);
ssif_inc_stat(ssif_info, received_message_parts);
}
continue_op:
if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
pr_info(PFX "DONE 1: state = %d, result=%d.\n",
ssif_info->ssif_state, result);
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
msg = ssif_info->curr_msg;
if (msg) {
msg->rsp_size = len;
if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
msg->rsp_size = IPMI_MAX_MSG_LENGTH;
memcpy(msg->rsp, data, msg->rsp_size);
ssif_info->curr_msg = NULL;
}
switch (ssif_info->ssif_state) {
case SSIF_NORMAL:
ipmi_ssif_unlock_cond(ssif_info, flags);
if (!msg)
break;
if (result < 0)
return_hosed_msg(ssif_info, msg);
else
deliver_recv_msg(ssif_info, msg);
break;
case SSIF_GETTING_FLAGS:
/* We got the flags from the SSIF, now handle them. */
if ((result < 0) || (len < 4) || (data[2] != 0)) {
/*
* Error fetching flags, or invalid length,
* just give up for now.
*/
ssif_info->ssif_state = SSIF_NORMAL;
ipmi_ssif_unlock_cond(ssif_info, flags);
pr_warn(PFX "Error getting flags: %d %d, %x\n",
result, len, data[2]);
} else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|| data[1] != IPMI_GET_MSG_FLAGS_CMD) {
pr_warn(PFX "Invalid response getting flags: %x %x\n",
data[0], data[1]);
} else {
ssif_inc_stat(ssif_info, flag_fetches);
ssif_info->msg_flags = data[3];
handle_flags(ssif_info, flags);
}
break;
case SSIF_CLEARING_FLAGS:
/* We cleared the flags. */
if ((result < 0) || (len < 3) || (data[2] != 0)) {
/* Error clearing flags */
pr_warn(PFX "Error clearing flags: %d %d, %x\n",
result, len, data[2]);
} else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|| data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
pr_warn(PFX "Invalid response clearing flags: %x %x\n",
data[0], data[1]);
}
ssif_info->ssif_state = SSIF_NORMAL;
ipmi_ssif_unlock_cond(ssif_info, flags);
break;
case SSIF_GETTING_EVENTS:
if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
/* Error getting event, probably done. */
msg->done(msg);
/* Take off the event flag. */
ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
handle_flags(ssif_info, flags);
} else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|| msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
pr_warn(PFX "Invalid response getting events: %x %x\n",
msg->rsp[0], msg->rsp[1]);
msg->done(msg);
/* Take off the event flag. */
ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
handle_flags(ssif_info, flags);
} else {
handle_flags(ssif_info, flags);
ssif_inc_stat(ssif_info, events);
deliver_recv_msg(ssif_info, msg);
}
break;
case SSIF_GETTING_MESSAGES:
if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
/* Error getting event, probably done. */
msg->done(msg);
/* Take off the msg flag. */
ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
handle_flags(ssif_info, flags);
} else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
|| msg->rsp[1] != IPMI_GET_MSG_CMD) {
pr_warn(PFX "Invalid response clearing flags: %x %x\n",
msg->rsp[0], msg->rsp[1]);
msg->done(msg);
/* Take off the msg flag. */
ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
handle_flags(ssif_info, flags);
} else {
ssif_inc_stat(ssif_info, incoming_messages);
handle_flags(ssif_info, flags);
deliver_recv_msg(ssif_info, msg);
}
break;
}
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
if (ssif_info->req_events)
start_event_fetch(ssif_info, flags);
else if (ssif_info->req_flags)
start_flag_fetch(ssif_info, flags);
else
start_next_msg(ssif_info, flags);
} else
ipmi_ssif_unlock_cond(ssif_info, flags);
if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state);
}
static void msg_written_handler(struct ssif_info *ssif_info, int result,
unsigned char *data, unsigned int len)
{
int rv;
/* We are single-threaded here, so no need for a lock. */
if (result < 0) {
ssif_info->retries_left--;
if (ssif_info->retries_left > 0) {
if (!start_resend(ssif_info)) {
ssif_inc_stat(ssif_info, send_retries);
return;
}
/* request failed, just return the error. */
ssif_inc_stat(ssif_info, send_errors);
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info(PFX
"Out of retries in msg_written_handler\n");
msg_done_handler(ssif_info, -EIO, NULL, 0);
return;
}
ssif_inc_stat(ssif_info, send_errors);
/*
* Got an error on transmit, let the done routine
* handle it.
*/
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info("Error in msg_written_handler: %d\n", result);
msg_done_handler(ssif_info, result, NULL, 0);
return;
}
if (ssif_info->multi_data) {
/*
* In the middle of a multi-data write. See the comment
* in the SSIF_MULTI_n_PART case in the probe function
* for details on the intricacies of this.
*/
int left;
ssif_inc_stat(ssif_info, sent_messages_parts);
left = ssif_info->multi_len - ssif_info->multi_pos;
if (left > 32)
left = 32;
/* Length byte. */
ssif_info->multi_data[ssif_info->multi_pos] = left;
ssif_info->multi_pos += left;
if (left < 32)
/*
* Write is finished. Note that we must end
* with a write of less than 32 bytes to
* complete the transaction, even if it is
* zero bytes.
*/
ssif_info->multi_data = NULL;
rv = ssif_i2c_send(ssif_info, msg_written_handler,
I2C_SMBUS_WRITE,
SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
ssif_info->multi_data + ssif_info->multi_pos,
I2C_SMBUS_BLOCK_DATA);
if (rv < 0) {
/* request failed, just return the error. */
ssif_inc_stat(ssif_info, send_errors);
if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
pr_info("Error from i2c_non_blocking_op(3)\n");
msg_done_handler(ssif_info, -EIO, NULL, 0);
}
} else {
unsigned long oflags, *flags;
bool got_alert;
ssif_inc_stat(ssif_info, sent_messages);
ssif_inc_stat(ssif_info, sent_messages_parts);
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
got_alert = ssif_info->got_alert;
if (got_alert) {
ssif_info->got_alert = false;
ssif_info->waiting_alert = false;
}
if (got_alert) {
ipmi_ssif_unlock_cond(ssif_info, flags);
/* The alert already happened, try now. */
retry_timeout((unsigned long) ssif_info);
} else {
/* Wait a jiffie then request the next message */
ssif_info->waiting_alert = true;
ssif_info->retries_left = SSIF_RECV_RETRIES;
ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
mod_timer(&ssif_info->retry_timer,
jiffies + SSIF_MSG_PART_JIFFIES);
ipmi_ssif_unlock_cond(ssif_info, flags);
}
}
}
static int start_resend(struct ssif_info *ssif_info)
{
int rv;
int command;
ssif_info->got_alert = false;
if (ssif_info->data_len > 32) {
command = SSIF_IPMI_MULTI_PART_REQUEST_START;
ssif_info->multi_data = ssif_info->data;
ssif_info->multi_len = ssif_info->data_len;
/*
* Subtle thing, this is 32, not 33, because we will
* overwrite the thing at position 32 (which was just
* transmitted) with the new length.
*/
ssif_info->multi_pos = 32;
ssif_info->data[0] = 32;
} else {
ssif_info->multi_data = NULL;
command = SSIF_IPMI_REQUEST;
ssif_info->data[0] = ssif_info->data_len;
}
rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
pr_info("Error from i2c_non_blocking_op(4)\n");
return rv;
}
static int start_send(struct ssif_info *ssif_info,
unsigned char *data,
unsigned int len)
{
if (len > IPMI_MAX_MSG_LENGTH)
return -E2BIG;
if (len > ssif_info->max_xmit_msg_size)
return -E2BIG;
ssif_info->retries_left = SSIF_SEND_RETRIES;
memcpy(ssif_info->data + 1, data, len);
ssif_info->data_len = len;
return start_resend(ssif_info);
}
/* Must be called with the message lock held. */
static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
{
struct ipmi_smi_msg *msg;
unsigned long oflags;
restart:
if (!SSIF_IDLE(ssif_info)) {
ipmi_ssif_unlock_cond(ssif_info, flags);
return;
}
if (!ssif_info->waiting_msg) {
ssif_info->curr_msg = NULL;
ipmi_ssif_unlock_cond(ssif_info, flags);
} else {
int rv;
ssif_info->curr_msg = ssif_info->waiting_msg;
ssif_info->waiting_msg = NULL;
ipmi_ssif_unlock_cond(ssif_info, flags);
rv = start_send(ssif_info,
ssif_info->curr_msg->data,
ssif_info->curr_msg->data_size);
if (rv) {
msg = ssif_info->curr_msg;
ssif_info->curr_msg = NULL;
return_hosed_msg(ssif_info, msg);
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
goto restart;
}
}
}
static void sender(void *send_info,
struct ipmi_smi_msg *msg)
{
struct ssif_info *ssif_info = (struct ssif_info *) send_info;
unsigned long oflags, *flags;
BUG_ON(ssif_info->waiting_msg);
ssif_info->waiting_msg = msg;
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
start_next_msg(ssif_info, flags);
if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
struct timeval t;
do_gettimeofday(&t);
pr_info("**Enqueue %02x %02x: %ld.%6.6ld\n",
msg->data[0], msg->data[1],
(long) t.tv_sec, (long) t.tv_usec);
}
}
static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
{
struct ssif_info *ssif_info = send_info;
data->addr_src = ssif_info->addr_source;
data->dev = &ssif_info->client->dev;
data->addr_info = ssif_info->addr_info;
get_device(data->dev);
return 0;
}
/*
* Instead of having our own timer to periodically check the message
* flags, we let the message handler drive us.
*/
static void request_events(void *send_info)
{
struct ssif_info *ssif_info = (struct ssif_info *) send_info;
unsigned long oflags, *flags;
if (!ssif_info->has_event_buffer)
return;
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
/*
* Request flags first, not events, because the lower layer
* doesn't have a way to send an attention. But make sure
* event checking still happens.
*/
ssif_info->req_events = true;
if (SSIF_IDLE(ssif_info))
start_flag_fetch(ssif_info, flags);
else {
ssif_info->req_flags = true;
ipmi_ssif_unlock_cond(ssif_info, flags);
}
}
static int inc_usecount(void *send_info)
{
struct ssif_info *ssif_info = send_info;
if (!i2c_get_adapter(ssif_info->client->adapter->nr))
return -ENODEV;
i2c_use_client(ssif_info->client);
return 0;
}
static void dec_usecount(void *send_info)
{
struct ssif_info *ssif_info = send_info;
i2c_release_client(ssif_info->client);
i2c_put_adapter(ssif_info->client->adapter);
}
static int ssif_start_processing(void *send_info,
ipmi_smi_t intf)
{
struct ssif_info *ssif_info = send_info;
ssif_info->intf = intf;
return 0;
}
#define MAX_SSIF_BMCS 4
static unsigned short addr[MAX_SSIF_BMCS];
static int num_addrs;
module_param_array(addr, ushort, &num_addrs, 0);
MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
static char *adapter_name[MAX_SSIF_BMCS];
static int num_adapter_names;
module_param_array(adapter_name, charp, &num_adapter_names, 0);
MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned.");
static int slave_addrs[MAX_SSIF_BMCS];
static int num_slave_addrs;
module_param_array(slave_addrs, int, &num_slave_addrs, 0);
MODULE_PARM_DESC(slave_addrs,
"The default IPMB slave address for the controller.");
/*
* Bit 0 enables message debugging, bit 1 enables state debugging, and
* bit 2 enables timing debugging. This is an array indexed by
* interface number"
*/
static int dbg[MAX_SSIF_BMCS];
static int num_dbg;
module_param_array(dbg, int, &num_dbg, 0);
MODULE_PARM_DESC(dbg, "Turn on debugging.");
static bool ssif_dbg_probe;
module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
static int use_thread;
module_param(use_thread, int, 0);
MODULE_PARM_DESC(use_thread, "Use the thread interface.");
static bool ssif_tryacpi = 1;
module_param_named(tryacpi, ssif_tryacpi, bool, 0);
MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
static bool ssif_trydmi = 1;
module_param_named(trydmi, ssif_trydmi, bool, 0);
MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
static DEFINE_MUTEX(ssif_infos_mutex);
static LIST_HEAD(ssif_infos);
static int ssif_remove(struct i2c_client *client)
{
struct ssif_info *ssif_info = i2c_get_clientdata(client);
int rv;
if (!ssif_info)
return 0;
/*
* After this point, we won't deliver anything asychronously
* to the message handler. We can unregister ourself.
*/
rv = ipmi_unregister_smi(ssif_info->intf);
if (rv) {
pr_err(PFX "Unable to unregister device: errno=%d\n", rv);
return rv;
}
ssif_info->intf = NULL;
/* make sure the driver is not looking for flags any more. */
while (ssif_info->ssif_state != SSIF_NORMAL)
schedule_timeout(1);
ssif_info->stopping = true;
del_timer_sync(&ssif_info->retry_timer);
if (ssif_info->thread) {
complete(&ssif_info->wake_thread);
kthread_stop(ssif_info->thread);
}
/*
* No message can be outstanding now, we have removed the
* upper layer and it permitted us to do so.
*/
kfree(ssif_info);
return 0;
}
static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
int *resp_len, unsigned char *resp)
{
int retry_cnt;
int ret;
retry_cnt = SSIF_SEND_RETRIES;
retry1:
ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
if (ret) {
retry_cnt--;
if (retry_cnt > 0)
goto retry1;
return -ENODEV;
}
ret = -ENODEV;
retry_cnt = SSIF_RECV_RETRIES;
while (retry_cnt > 0) {
ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
resp);
if (ret > 0)
break;
msleep(SSIF_MSG_MSEC);
retry_cnt--;
if (retry_cnt <= 0)
break;
}
if (ret > 0) {
/* Validate that the response is correct. */
if (ret < 3 ||
(resp[0] != (msg[0] | (1 << 2))) ||
(resp[1] != msg[1]))
ret = -EINVAL;
else {
*resp_len = ret;
ret = 0;
}
}
return ret;
}
static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
{
unsigned char *resp;
unsigned char msg[3];
int rv;
int len;
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
if (!resp)
return -ENOMEM;
/* Do a Get Device ID command, since it is required. */
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_GET_DEVICE_ID_CMD;
rv = do_cmd(client, 2, msg, &len, resp);
if (rv)
rv = -ENODEV;
else
strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
kfree(resp);
return rv;
}
static int smi_type_proc_show(struct seq_file *m, void *v)
{
seq_puts(m, "ssif\n");
return 0;
}
static int smi_type_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, smi_type_proc_show, inode->i_private);
}
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_stats_proc_show(struct seq_file *m, void *v)
{
struct ssif_info *ssif_info = m->private;
seq_printf(m, "sent_messages: %u\n",
ssif_get_stat(ssif_info, sent_messages));
seq_printf(m, "sent_messages_parts: %u\n",
ssif_get_stat(ssif_info, sent_messages_parts));
seq_printf(m, "send_retries: %u\n",
ssif_get_stat(ssif_info, send_retries));
seq_printf(m, "send_errors: %u\n",
ssif_get_stat(ssif_info, send_errors));
seq_printf(m, "received_messages: %u\n",
ssif_get_stat(ssif_info, received_messages));
seq_printf(m, "received_message_parts: %u\n",
ssif_get_stat(ssif_info, received_message_parts));
seq_printf(m, "receive_retries: %u\n",
ssif_get_stat(ssif_info, receive_retries));
seq_printf(m, "receive_errors: %u\n",
ssif_get_stat(ssif_info, receive_errors));
seq_printf(m, "flag_fetches: %u\n",
ssif_get_stat(ssif_info, flag_fetches));
seq_printf(m, "hosed: %u\n",
ssif_get_stat(ssif_info, hosed));
seq_printf(m, "events: %u\n",
ssif_get_stat(ssif_info, events));
seq_printf(m, "watchdog_pretimeouts: %u\n",
ssif_get_stat(ssif_info, watchdog_pretimeouts));
seq_printf(m, "alerts: %u\n",
ssif_get_stat(ssif_info, alerts));
return 0;
}
static int smi_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
}
static const struct file_operations smi_stats_proc_ops = {
.open = smi_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int strcmp_nospace(char *s1, char *s2)
{
while (*s1 && *s2) {
while (isspace(*s1))
s1++;
while (isspace(*s2))
s2++;
if (*s1 > *s2)
return 1;
if (*s1 < *s2)
return -1;
s1++;
s2++;
}
return 0;
}
static struct ssif_addr_info *ssif_info_find(unsigned short addr,
char *adapter_name,
bool match_null_name)
{
struct ssif_addr_info *info, *found = NULL;
restart:
list_for_each_entry(info, &ssif_infos, link) {
if (info->binfo.addr == addr) {
if (info->adapter_name || adapter_name) {
if (!info->adapter_name != !adapter_name) {
/* One is NULL and one is not */
continue;
}
if (adapter_name &&
strcmp_nospace(info->adapter_name,
adapter_name))
/* Names do not match */
continue;
}
found = info;
break;
}
}
if (!found && match_null_name) {
/* Try to get an exact match first, then try with a NULL name */
adapter_name = NULL;
match_null_name = false;
goto restart;
}
return found;
}
static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
{
#ifdef CONFIG_ACPI
acpi_handle acpi_handle;
acpi_handle = ACPI_HANDLE(dev);
if (acpi_handle) {
ssif_info->addr_source = SI_ACPI;
ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
return true;
}
#endif
return false;
}
/*
* 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 int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
unsigned char msg[3];
unsigned char *resp;
struct ssif_info *ssif_info;
int rv = 0;
int len;
int i;
u8 slave_addr = 0;
struct ssif_addr_info *addr_info = NULL;
resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
if (!resp)
return -ENOMEM;
ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
if (!ssif_info) {
kfree(resp);
return -ENOMEM;
}
if (!check_acpi(ssif_info, &client->dev)) {
addr_info = ssif_info_find(client->addr, client->adapter->name,
true);
if (!addr_info) {
/* Must have come in through sysfs. */
ssif_info->addr_source = SI_HOTMOD;
} else {
ssif_info->addr_source = addr_info->addr_src;
ssif_info->ssif_debug = addr_info->debug;
ssif_info->addr_info = addr_info->addr_info;
slave_addr = addr_info->slave_addr;
}
}
pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
ipmi_addr_src_to_str(ssif_info->addr_source),
client->addr, client->adapter->name, slave_addr);
/*
* 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;
rv = do_cmd(client, 2, msg, &len, resp);
if (rv)
goto out;
rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id);
if (rv)
goto out;
ssif_info->client = client;
i2c_set_clientdata(client, ssif_info);
/* Now check for system interface capabilities */
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
msg[2] = 0; /* SSIF */
rv = do_cmd(client, 3, msg, &len, resp);
if (!rv && (len >= 3) && (resp[2] == 0)) {
if (len < 7) {
if (ssif_dbg_probe)
pr_info(PFX "SSIF info too short: %d\n", len);
goto no_support;
}
/* Got a good SSIF response, handle it. */
ssif_info->max_xmit_msg_size = resp[5];
ssif_info->max_recv_msg_size = resp[6];
ssif_info->multi_support = (resp[4] >> 6) & 0x3;
ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
/* Sanitize the data */
switch (ssif_info->multi_support) {
case SSIF_NO_MULTI:
if (ssif_info->max_xmit_msg_size > 32)
ssif_info->max_xmit_msg_size = 32;
if (ssif_info->max_recv_msg_size > 32)
ssif_info->max_recv_msg_size = 32;
break;
case SSIF_MULTI_2_PART:
if (ssif_info->max_xmit_msg_size > 63)
ssif_info->max_xmit_msg_size = 63;
if (ssif_info->max_recv_msg_size > 62)
ssif_info->max_recv_msg_size = 62;
break;
case SSIF_MULTI_n_PART:
/*
* The specification is rather confusing at
* this point, but I think I understand what
* is meant. At least I have a workable
* solution. With multi-part messages, you
* cannot send a message that is a multiple of
* 32-bytes in length, because the start and
* middle messages are 32-bytes and the end
* message must be at least one byte. You
* can't fudge on an extra byte, that would
* screw up things like fru data writes. So
* we limit the length to 63 bytes. That way
* a 32-byte message gets sent as a single
* part. A larger message will be a 32-byte
* start and the next message is always going
* to be 1-31 bytes in length. Not ideal, but
* it should work.
*/
if (ssif_info->max_xmit_msg_size > 63)
ssif_info->max_xmit_msg_size = 63;
break;
default:
/* Data is not sane, just give up. */
goto no_support;
}
} else {
no_support:
/* Assume no multi-part or PEC support */
pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
rv, len, resp[2]);
ssif_info->max_xmit_msg_size = 32;
ssif_info->max_recv_msg_size = 32;
ssif_info->multi_support = SSIF_NO_MULTI;
ssif_info->supports_pec = 0;
}
/* Make sure the NMI timeout is cleared. */
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
msg[2] = WDT_PRE_TIMEOUT_INT;
rv = do_cmd(client, 3, msg, &len, resp);
if (rv || (len < 3) || (resp[2] != 0))
pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n",
rv, len, resp[2]);
/* Attempt to enable the event buffer. */
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
rv = do_cmd(client, 2, msg, &len, resp);
if (rv || (len < 4) || (resp[2] != 0)) {
pr_warn(PFX "Error getting global enables: %d %d %2.2x\n",
rv, len, resp[2]);
rv = 0; /* Not fatal */
goto found;
}
ssif_info->global_enables = resp[3];
if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
ssif_info->has_event_buffer = true;
/* buffer is already enabled, nothing to do. */
goto found;
}
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF;
rv = do_cmd(client, 3, msg, &len, resp);
if (rv || (len < 2)) {
pr_warn(PFX "Error setting global enables: %d %d %2.2x\n",
rv, len, resp[2]);
rv = 0; /* Not fatal */
goto found;
}
if (resp[2] == 0) {
/* A successful return means the event buffer is supported. */
ssif_info->has_event_buffer = true;
ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF;
}
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR;
rv = do_cmd(client, 3, msg, &len, resp);
if (rv || (len < 2)) {
pr_warn(PFX "Error setting global enables: %d %d %2.2x\n",
rv, len, resp[2]);
rv = 0; /* Not fatal */
goto found;
}
if (resp[2] == 0) {
/* A successful return means the alert is supported. */
ssif_info->supports_alert = true;
ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR;
}
found:
ssif_info->intf_num = atomic_inc_return(&next_intf);
if (ssif_dbg_probe) {
pr_info("ssif_probe: i2c_probe found device at i2c address %x\n",
client->addr);
}
spin_lock_init(&ssif_info->lock);
ssif_info->ssif_state = SSIF_NORMAL;
init_timer(&ssif_info->retry_timer);
ssif_info->retry_timer.data = (unsigned long) ssif_info;
ssif_info->retry_timer.function = retry_timeout;
for (i = 0; i < SSIF_NUM_STATS; i++)
atomic_set(&ssif_info->stats[i], 0);
if (ssif_info->supports_pec)
ssif_info->client->flags |= I2C_CLIENT_PEC;
ssif_info->handlers.owner = THIS_MODULE;
ssif_info->handlers.start_processing = ssif_start_processing;
ssif_info->handlers.get_smi_info = get_smi_info;
ssif_info->handlers.sender = sender;
ssif_info->handlers.request_events = request_events;
ssif_info->handlers.inc_usecount = inc_usecount;
ssif_info->handlers.dec_usecount = dec_usecount;
{
unsigned int thread_num;
thread_num = ((ssif_info->client->adapter->nr << 8) |
ssif_info->client->addr);
init_completion(&ssif_info->wake_thread);
ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
"kssif%4.4x", thread_num);
if (IS_ERR(ssif_info->thread)) {
rv = PTR_ERR(ssif_info->thread);
dev_notice(&ssif_info->client->dev,
"Could not start kernel thread: error %d\n",
rv);
goto out;
}
}
rv = ipmi_register_smi(&ssif_info->handlers,
ssif_info,
&ssif_info->device_id,
&ssif_info->client->dev,
slave_addr);
if (rv) {
pr_err(PFX "Unable to register device: error %d\n", rv);
goto out;
}
rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type",
&smi_type_proc_ops,
ssif_info);
if (rv) {
pr_err(PFX "Unable to create proc entry: %d\n", rv);
goto out_err_unreg;
}
rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats",
&smi_stats_proc_ops,
ssif_info);
if (rv) {
pr_err(PFX "Unable to create proc entry: %d\n", rv);
goto out_err_unreg;
}
out:
if (rv)
kfree(ssif_info);
kfree(resp);
return rv;
out_err_unreg:
ipmi_unregister_smi(ssif_info->intf);
goto out;
}
static int ssif_adapter_handler(struct device *adev, void *opaque)
{
struct ssif_addr_info *addr_info = opaque;
if (adev->type != &i2c_adapter_type)
return 0;
i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo);
if (!addr_info->adapter_name)
return 1; /* Only try the first I2C adapter by default. */
return 0;
}
static int new_ssif_client(int addr, char *adapter_name,
int debug, int slave_addr,
enum ipmi_addr_src addr_src)
{
struct ssif_addr_info *addr_info;
int rv = 0;
mutex_lock(&ssif_infos_mutex);
if (ssif_info_find(addr, adapter_name, false)) {
rv = -EEXIST;
goto out_unlock;
}
addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
if (!addr_info) {
rv = -ENOMEM;
goto out_unlock;
}
if (adapter_name) {
addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
if (!addr_info->adapter_name) {
kfree(addr_info);
rv = -ENOMEM;
goto out_unlock;
}
}
strncpy(addr_info->binfo.type, DEVICE_NAME,
sizeof(addr_info->binfo.type));
addr_info->binfo.addr = addr;
addr_info->binfo.platform_data = addr_info;
addr_info->debug = debug;
addr_info->slave_addr = slave_addr;
addr_info->addr_src = addr_src;
list_add_tail(&addr_info->link, &ssif_infos);
if (initialized)
i2c_for_each_dev(addr_info, ssif_adapter_handler);
/* Otherwise address list will get it */
out_unlock:
mutex_unlock(&ssif_infos_mutex);
return rv;
}
static void free_ssif_clients(void)
{
struct ssif_addr_info *info, *tmp;
mutex_lock(&ssif_infos_mutex);
list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
list_del(&info->link);
kfree(info->adapter_name);
kfree(info);
}
mutex_unlock(&ssif_infos_mutex);
}
static unsigned short *ssif_address_list(void)
{
struct ssif_addr_info *info;
unsigned int count = 0, i;
unsigned short *address_list;
list_for_each_entry(info, &ssif_infos, link)
count++;
address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL);
if (!address_list)
return NULL;
i = 0;
list_for_each_entry(info, &ssif_infos, link) {
unsigned short addr = info->binfo.addr;
int j;
for (j = 0; j < i; j++) {
if (address_list[j] == addr)
goto skip_addr;
}
address_list[i] = addr;
skip_addr:
i++;
}
address_list[i] = I2C_CLIENT_END;
return address_list;
}
#ifdef CONFIG_ACPI
static struct acpi_device_id ssif_acpi_match[] = {
{ "IPI0001", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
/*
* 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;
/*
* Defined in the IPMI 2.0 spec.
*/
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)
{
unsigned short myaddr;
if (num_addrs >= MAX_SSIF_BMCS)
return -1;
if (spmi->IPMIlegacy != 1) {
pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy);
return -ENODEV;
}
if (spmi->InterfaceType != 4)
return -ENODEV;
if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) {
pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n",
spmi->addr.space_id);
return -EIO;
}
myaddr = spmi->addr.address >> 1;
return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI);
}
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);
}
}
#else
static void spmi_find_bmc(void) { }
#endif
#ifdef CONFIG_DMI
static int decode_dmi(const struct dmi_device *dmi_dev)
{
struct dmi_header *dm = dmi_dev->device_data;
u8 *data = (u8 *) dm;
u8 len = dm->length;
unsigned short myaddr;
int slave_addr;
if (num_addrs >= MAX_SSIF_BMCS)
return -1;
if (len < 9)
return -1;
if (data[0x04] != 4) /* Not SSIF */
return -1;
if ((data[8] >> 1) == 0) {
/*
* Some broken systems put the I2C address in
* the slave address field. We try to
* accommodate them here.
*/
myaddr = data[6] >> 1;
slave_addr = 0;
} else {
myaddr = data[8] >> 1;
slave_addr = data[6];
}
return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS);
}
static void dmi_iterator(void)
{
const struct dmi_device *dev = NULL;
while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
decode_dmi(dev);
}
#else
static void dmi_iterator(void) { }
#endif
static const struct i2c_device_id ssif_id[] = {
{ DEVICE_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ssif_id);
static struct i2c_driver ssif_i2c_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.owner = THIS_MODULE,
.name = DEVICE_NAME
},
.probe = ssif_probe,
.remove = ssif_remove,
.alert = ssif_alert,
.id_table = ssif_id,
.detect = ssif_detect
};
static int init_ipmi_ssif(void)
{
int i;
int rv;
if (initialized)
return 0;
pr_info("IPMI SSIF Interface driver\n");
/* build list for i2c from addr list */
for (i = 0; i < num_addrs; i++) {
rv = new_ssif_client(addr[i], adapter_name[i],
dbg[i], slave_addrs[i],
SI_HARDCODED);
if (rv)
pr_err(PFX
"Couldn't add hardcoded device at addr 0x%x\n",
addr[i]);
}
if (ssif_tryacpi)
ssif_i2c_driver.driver.acpi_match_table =
ACPI_PTR(ssif_acpi_match);
if (ssif_trydmi)
dmi_iterator();
if (ssif_tryacpi)
spmi_find_bmc();
ssif_i2c_driver.address_list = ssif_address_list();
rv = i2c_add_driver(&ssif_i2c_driver);
if (!rv)
initialized = true;
return rv;
}
module_init(init_ipmi_ssif);
static void cleanup_ipmi_ssif(void)
{
if (!initialized)
return;
initialized = false;
i2c_del_driver(&ssif_i2c_driver);
free_ssif_clients();
}
module_exit(cleanup_ipmi_ssif);
MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
MODULE_LICENSE("GPL");
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