drivers/misc/ibmasm/ibmasm.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 /*
   4  * IBM ASM Service Processor Device Driver
   5  *
   6  * Copyright (C) IBM Corporation, 2004
   7  *
   8  * Author: Max Asböck <amax@us.ibm.com>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/list.h>
  15 #include <linux/wait.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/kref.h>
  21 #include <linux/device.h>
  22 #include <linux/input.h>
  23 #include <linux/time64.h>
  24
  25 /* Driver identification */
  26 #define DRIVER_NAME     "ibmasm"
  27 #define DRIVER_VERSION  "1.0"
  28 #define DRIVER_AUTHOR   "Max Asbock <masbock@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
  29 #define DRIVER_DESC     "IBM ASM Service Processor Driver"
  30
  31 #define err(msg) printk(KERN_ERR "%s: " msg "\n", DRIVER_NAME)
  32 #define info(msg) printk(KERN_INFO "%s: " msg "\n", DRIVER_NAME)
  33
  34 extern int ibmasm_debug;
  35 #define dbg(STR, ARGS...)                                       \
  36         do {                                                    \
  37                 if (ibmasm_debug)                               \
  38                         printk(KERN_DEBUG STR , ##ARGS);        \
  39         } while (0)
  40
  41 static inline char *get_timestamp(char *buf)
  42 {
  43         struct timespec64 now;
  44
  45         ktime_get_real_ts64(&now);
  46         sprintf(buf, "%llu.%.08lu", (long long)now.tv_sec,
  47                                 now.tv_nsec / NSEC_PER_USEC);
  48         return buf;
  49 }
  50
  51 #define IBMASM_CMD_PENDING      0
  52 #define IBMASM_CMD_COMPLETE     1
  53 #define IBMASM_CMD_FAILED       2
  54
  55 #define IBMASM_CMD_TIMEOUT_NORMAL       45
  56 #define IBMASM_CMD_TIMEOUT_EXTRA        240
  57
  58 #define IBMASM_CMD_MAX_BUFFER_SIZE      0x8000
  59
  60 #define REVERSE_HEARTBEAT_TIMEOUT       120
  61
  62 #define HEARTBEAT_BUFFER_SIZE           0x400
  63
  64 #ifdef IA64
  65 #define IBMASM_DRIVER_VPD "Lin64 6.08      "
  66 #else
  67 #define IBMASM_DRIVER_VPD "Lin32 6.08      "
  68 #endif
  69
  70 #define SYSTEM_STATE_OS_UP      5
  71 #define SYSTEM_STATE_OS_DOWN    4
  72
  73 #define IBMASM_NAME_SIZE        16
  74
  75 #define IBMASM_NUM_EVENTS       10
  76 #define IBMASM_EVENT_MAX_SIZE   2048u
  77
  78
  79 struct command {
  80         struct list_head        queue_node;
  81         wait_queue_head_t       wait;
  82         unsigned char           *buffer;
  83         size_t                  buffer_size;
  84         int                     status;
  85         struct kref             kref;
  86         spinlock_t              *lock;
  87 };
  88 #define to_command(c) container_of(c, struct command, kref)
  89
  90 void ibmasm_free_command(struct kref *kref);
  91 static inline void command_put(struct command *cmd)
  92 {
  93         unsigned long flags;
  94         spinlock_t *lock = cmd->lock;
  95
  96         spin_lock_irqsave(lock, flags);
  97         kref_put(&cmd->kref, ibmasm_free_command);
  98         spin_unlock_irqrestore(lock, flags);
  99 }
 100
 101 static inline void command_get(struct command *cmd)
 102 {
 103         kref_get(&cmd->kref);
 104 }
 105
 106
 107 struct ibmasm_event {
 108         unsigned int    serial_number;
 109         unsigned int    data_size;
 110         unsigned char   data[IBMASM_EVENT_MAX_SIZE];
 111 };
 112
 113 struct event_buffer {
 114         struct ibmasm_event     events[IBMASM_NUM_EVENTS];
 115         unsigned int            next_serial_number;
 116         unsigned int            next_index;
 117         struct list_head        readers;
 118 };
 119
 120 struct event_reader {
 121         int                     cancelled;
 122         unsigned int            next_serial_number;
 123         wait_queue_head_t       wait;
 124         struct list_head        node;
 125         unsigned int            data_size;
 126         unsigned char           data[IBMASM_EVENT_MAX_SIZE];
 127 };
 128
 129 struct reverse_heartbeat {
 130         wait_queue_head_t       wait;
 131         unsigned int            stopped;
 132 };
 133
 134 struct ibmasm_remote {
 135         struct input_dev *keybd_dev;
 136         struct input_dev *mouse_dev;
 137 };
 138
 139 struct service_processor {
 140         struct list_head        node;
 141         spinlock_t              lock;
 142         void __iomem            *base_address;
 143         unsigned int            irq;
 144         struct command          *current_command;
 145         struct command          *heartbeat;
 146         struct list_head        command_queue;
 147         struct event_buffer     *event_buffer;
 148         char                    dirname[IBMASM_NAME_SIZE];
 149         char                    devname[IBMASM_NAME_SIZE];
 150         unsigned int            number;
 151         struct ibmasm_remote    remote;
 152         int                     serial_line;
 153         struct device           *dev;
 154 };
 155
 156 /* command processing */
 157 struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_size);
 158 void ibmasm_exec_command(struct service_processor *sp, struct command *cmd);
 159 void ibmasm_wait_for_response(struct command *cmd, int timeout);
 160 void ibmasm_receive_command_response(struct service_processor *sp, void *response,  size_t size);
 161
 162 /* event processing */
 163 int ibmasm_event_buffer_init(struct service_processor *sp);
 164 void ibmasm_event_buffer_exit(struct service_processor *sp);
 165 void ibmasm_receive_event(struct service_processor *sp, void *data,  unsigned int data_size);
 166 void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader);
 167 void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_reader *reader);
 168 int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *reader);
 169 void ibmasm_cancel_next_event(struct event_reader *reader);
 170
 171 /* heartbeat - from SP to OS */
 172 void ibmasm_register_panic_notifier(void);
 173 void ibmasm_unregister_panic_notifier(void);
 174 int ibmasm_heartbeat_init(struct service_processor *sp);
 175 void ibmasm_heartbeat_exit(struct service_processor *sp);
 176 void ibmasm_receive_heartbeat(struct service_processor *sp,  void *message, size_t size);
 177
 178 /* reverse heartbeat - from OS to SP */
 179 void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
 180 int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
 181 void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb);
 182
 183 /* dot commands */
 184 void ibmasm_receive_message(struct service_processor *sp, void *data, int data_size);
 185 int ibmasm_send_driver_vpd(struct service_processor *sp);
 186 int ibmasm_send_os_state(struct service_processor *sp, int os_state);
 187
 188 /* low level message processing */
 189 int ibmasm_send_i2o_message(struct service_processor *sp);
 190 irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id);
 191
 192 /* remote console */
 193 void ibmasm_handle_mouse_interrupt(struct service_processor *sp);
 194 int ibmasm_init_remote_input_dev(struct service_processor *sp);
 195 void ibmasm_free_remote_input_dev(struct service_processor *sp);
 196
 197 /* file system */
 198 int ibmasmfs_register(void);
 199 void ibmasmfs_unregister(void);
 200 void ibmasmfs_add_sp(struct service_processor *sp);
 201
 202 /* uart */
 203 #if IS_ENABLED(CONFIG_SERIAL_8250)
 204 void ibmasm_register_uart(struct service_processor *sp);
 205 void ibmasm_unregister_uart(struct service_processor *sp);
 206 #else
 207 #define ibmasm_register_uart(sp)        do { } while(0)
 208 #define ibmasm_unregister_uart(sp)      do { } while(0)
 209 #endif