210 lines
5.9 KiB
C
210 lines
5.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* IBM ASM Service Processor Device Driver
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*
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* Copyright (C) IBM Corporation, 2004
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*
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* Author: Max Asböck <amax@us.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kref.h>
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/time64.h>
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/* Driver identification */
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#define DRIVER_NAME "ibmasm"
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#define DRIVER_VERSION "1.0"
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#define DRIVER_AUTHOR "Max Asbock <masbock@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
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#define DRIVER_DESC "IBM ASM Service Processor Driver"
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#define err(msg) printk(KERN_ERR "%s: " msg "\n", DRIVER_NAME)
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#define info(msg) printk(KERN_INFO "%s: " msg "\n", DRIVER_NAME)
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extern int ibmasm_debug;
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#define dbg(STR, ARGS...) \
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do { \
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if (ibmasm_debug) \
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printk(KERN_DEBUG STR , ##ARGS); \
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} while (0)
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static inline char *get_timestamp(char *buf)
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{
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struct timespec64 now;
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ktime_get_real_ts64(&now);
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sprintf(buf, "%llu.%.08lu", (long long)now.tv_sec,
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now.tv_nsec / NSEC_PER_USEC);
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return buf;
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}
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#define IBMASM_CMD_PENDING 0
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#define IBMASM_CMD_COMPLETE 1
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#define IBMASM_CMD_FAILED 2
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#define IBMASM_CMD_TIMEOUT_NORMAL 45
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#define IBMASM_CMD_TIMEOUT_EXTRA 240
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#define IBMASM_CMD_MAX_BUFFER_SIZE 0x8000
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#define REVERSE_HEARTBEAT_TIMEOUT 120
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#define HEARTBEAT_BUFFER_SIZE 0x400
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#ifdef IA64
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#define IBMASM_DRIVER_VPD "Lin64 6.08 "
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#else
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#define IBMASM_DRIVER_VPD "Lin32 6.08 "
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#endif
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#define SYSTEM_STATE_OS_UP 5
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#define SYSTEM_STATE_OS_DOWN 4
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#define IBMASM_NAME_SIZE 16
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#define IBMASM_NUM_EVENTS 10
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#define IBMASM_EVENT_MAX_SIZE 2048u
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struct command {
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struct list_head queue_node;
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wait_queue_head_t wait;
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unsigned char *buffer;
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size_t buffer_size;
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int status;
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struct kref kref;
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spinlock_t *lock;
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};
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#define to_command(c) container_of(c, struct command, kref)
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void ibmasm_free_command(struct kref *kref);
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static inline void command_put(struct command *cmd)
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{
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unsigned long flags;
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spinlock_t *lock = cmd->lock;
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spin_lock_irqsave(lock, flags);
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kref_put(&cmd->kref, ibmasm_free_command);
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spin_unlock_irqrestore(lock, flags);
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}
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static inline void command_get(struct command *cmd)
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{
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kref_get(&cmd->kref);
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}
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struct ibmasm_event {
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unsigned int serial_number;
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unsigned int data_size;
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unsigned char data[IBMASM_EVENT_MAX_SIZE];
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};
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struct event_buffer {
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struct ibmasm_event events[IBMASM_NUM_EVENTS];
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unsigned int next_serial_number;
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unsigned int next_index;
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struct list_head readers;
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};
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struct event_reader {
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int cancelled;
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unsigned int next_serial_number;
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wait_queue_head_t wait;
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struct list_head node;
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unsigned int data_size;
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unsigned char data[IBMASM_EVENT_MAX_SIZE];
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};
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struct reverse_heartbeat {
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wait_queue_head_t wait;
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unsigned int stopped;
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};
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struct ibmasm_remote {
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struct input_dev *keybd_dev;
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struct input_dev *mouse_dev;
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};
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struct service_processor {
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struct list_head node;
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spinlock_t lock;
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void __iomem *base_address;
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unsigned int irq;
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struct command *current_command;
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struct command *heartbeat;
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struct list_head command_queue;
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struct event_buffer *event_buffer;
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char dirname[IBMASM_NAME_SIZE];
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char devname[IBMASM_NAME_SIZE];
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unsigned int number;
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struct ibmasm_remote remote;
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int serial_line;
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struct device *dev;
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};
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/* command processing */
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struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_size);
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void ibmasm_exec_command(struct service_processor *sp, struct command *cmd);
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void ibmasm_wait_for_response(struct command *cmd, int timeout);
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void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size);
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/* event processing */
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int ibmasm_event_buffer_init(struct service_processor *sp);
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void ibmasm_event_buffer_exit(struct service_processor *sp);
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void ibmasm_receive_event(struct service_processor *sp, void *data, unsigned int data_size);
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void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader);
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void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_reader *reader);
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int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *reader);
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void ibmasm_cancel_next_event(struct event_reader *reader);
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/* heartbeat - from SP to OS */
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void ibmasm_register_panic_notifier(void);
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void ibmasm_unregister_panic_notifier(void);
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int ibmasm_heartbeat_init(struct service_processor *sp);
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void ibmasm_heartbeat_exit(struct service_processor *sp);
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void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size);
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/* reverse heartbeat - from OS to SP */
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void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
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int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
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void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb);
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/* dot commands */
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void ibmasm_receive_message(struct service_processor *sp, void *data, int data_size);
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int ibmasm_send_driver_vpd(struct service_processor *sp);
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int ibmasm_send_os_state(struct service_processor *sp, int os_state);
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/* low level message processing */
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int ibmasm_send_i2o_message(struct service_processor *sp);
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irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id);
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/* remote console */
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void ibmasm_handle_mouse_interrupt(struct service_processor *sp);
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int ibmasm_init_remote_input_dev(struct service_processor *sp);
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void ibmasm_free_remote_input_dev(struct service_processor *sp);
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/* file system */
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int ibmasmfs_register(void);
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void ibmasmfs_unregister(void);
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void ibmasmfs_add_sp(struct service_processor *sp);
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/* uart */
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#if IS_ENABLED(CONFIG_SERIAL_8250)
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void ibmasm_register_uart(struct service_processor *sp);
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void ibmasm_unregister_uart(struct service_processor *sp);
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#else
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#define ibmasm_register_uart(sp) do { } while(0)
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#define ibmasm_unregister_uart(sp) do { } while(0)
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#endif
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