| /* |
| * 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> |
| #include <linux/time64.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 { |
| /* Ready to request the result. */ |
| unsigned long oflags, *flags; |
| |
| ssif_inc_stat(ssif_info, sent_messages); |
| ssif_inc_stat(ssif_info, sent_messages_parts); |
| |
| flags = ipmi_ssif_lock_cond(ssif_info, &oflags); |
| if (ssif_info->got_alert) { |
| /* The result is already ready, just start it. */ |
| ssif_info->got_alert = false; |
| ipmi_ssif_unlock_cond(ssif_info, flags); |
| start_get(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 timespec64 t; |
| |
| ktime_get_real_ts64(&t); |
| pr_info("**Enqueue %02x %02x: %lld.%6.6ld\n", |
| msg->data[0], msg->data[1], |
| (long long) t.tv_sec, (long) t.tv_nsec / NSEC_PER_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."); |
| |
| static bool alerts_broken; |
| module_param(alerts_broken, bool, 0); |
| MODULE_PARM_DESC(alerts_broken, "Don't enable alerts 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 = true; |
| 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 = true; |
| 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; |
| } |
| |
| /* Some systems don't behave well if you enable alerts. */ |
| if (alerts_broken) |
| 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_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 const 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 = { |
| .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"); |